GSM BSS InteroperabiIity Between GSM and WCDMA Feature Parameter
Description
Copyright Huawei TechnoIogies Co., Ltd. 2012. AII rights
reserved. No part of this document may be reproduced or transmitted
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S" without warranties, guarantees or representations of any kind,
either express or implied. The information in this document is
subject to change without notice. Every effort has been made in the
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but all statements, information, and recommendations in this
document do not constitute a warranty of any kind, express or
implied. Contents 1 Introduction 1.1 Scope 1.2 ntended Audience 1.3
Change History 2 Overview 3 Iur-g Interface Between GSM and WCDMA
3.1 ntroduction to the ur-g nterface 3.2 Common Measurement 3.3
nformation Exchange 4 Measurement of Neighboring WCDMA CeIIs 5
GSM/WCDMA Inter-RAT CeII ReseIection 5.1 Cell Reselection from
WCDMA to GSM 5.1.1 Cell Reselection from WCDMA to GSM for MSs in
dle Mode 5.1.2 WCDMA-to-GSM NACC 5.2 Cell Reselection from GSM to
WCDMA 5.2.1 Cell Reselection Based on Cell Ranking 5.2.2 Fast WCDMA
Reselection at 2G CS Call Release 5.2.3 NC2 between GSM and WCDMA 6
GSM/WCDMA Inter-RAT CS Handover 6.1 CS Handover from WCDMA to GSM
6.2 CS Handover from GSM to WCDMA 6.2.1 Overview 6.3 Service-Based
CS Handover from GSM to WCDMA 6.3.1 Overview 6.3.2 Procedure 6.4
Load-Based CS Handover from GSM to WCDMA 6.4.1 Overview 6.4.2
Procedure 7 GSM/WCDMA Inter-RAT PS Handover 7.1 WCDMA-to-GSM PS
Handover 7.1.1 Overview 7.1.2 Procedure 7.2 GSM-to-WCDMA PS
Handover 7.2.1 Overview 7.2.2 Procedure 8 ReIated Features 9 Impact
on the Network 9.1 GSM/WCDMA nteroperability 9.1.1 mpact on System
Capacity 9.1.2 mpact on Network Performance 9.2 GSM/WCDMA Service
Based Handover 9.2.1 mpact on System Capacity 9.2.2 mpact on
Network Performance 9.3 GSM/WCDMA Load Based Handover 9.3.1 mpact
on System Capacity 9.3.2 mpact on Network Performance 9.4 2G/3G
Cell Reselection Based on MS State 9.4.1 mpact on System Capacity
9.4.2 mpact on Network Performance 9.5 Fast WCDMA Reselection at 2G
CS Call Release 9.5.1 mpact on System Capacity 9.5.2 mpact on
Network Performance 10 Engineering GuideIines 10.1 When to Use
nteroperability Between GSM and WCDMA 10.1.1 GSM/WCDMA
nteroperability 10.1.2 GSM/WCDMA Service Based Handover 10.1.3
GSM/WCDMA Load Based Handover 10.1.4 2G/3G Cell Reselection Based
on MS State 10.1.5 Fast WCDMA Reselection at 2G CS Call Release
10.2 nformation to Be Collected 10.2.1 GSM/WCDMA nteroperability
10.2.2 GSM/WCDMA Service Based Handover 10.2.3 GSM/WCDMA Load Based
Handover 10.2.4 2G/3G Cell Reselection Based on MS State 10.2.5
2G/3G Cell Reselection Based on MS State 10.3 Network Planning
10.3.1 GSM/WCDMA nteroperability 10.3.2 GSM/WCDMA Service Based
Handover 10.3.3 GSM/WCDMA Load Based Handover 10.3.4 2G/3G Cell
Reselection Based on MS State 10.3.5 Fast WCDMA Reselection at 2G
CS Call Release 10.4 Overall Deployment Procedure 10.5 Deploying
GSM/WCDMA nteroperability 10.6 Deploying 2G/3G Cell Reselection
Based on MS State 10.7 Deploying GSM/WCDMA Service Based Handover
10.8 Deploying GSM/WCDMA Load Based Handover 10.9 Deploying Fast
WCDMA Reselection at 2G CS Call Release 10.10 Related Parameters in
the System nformation 10.11 Neighboring WCDMA Cell Configuration
10.12 ur-g nterface Between GSM and WCDMA 10.13 GSM/WCDMA nter-RAT
NC2 and GSM/WCDMA nter-RAT PS Handover 10.14 Performance
Optimization 10.14.1 GSM/WCDMA nteroperability and 2G/3G Cell
Reselection Based on MS State 10.14.2 GSM/WCDMA Service Based
Handover and GSM/WCDMA Load Based Handover 10.14.3 Fast WCDMA
Reselection at 2G CS Call Release 10.15 Troubleshooting 11
Parameters 12 Counters 13 GIossary 14 Reference Documents
1 Introduction 1.1 Scope This document describes the
nteroperability Between GSM and WCDMA feature, including its
technical description, feature dependencies, network impact, and
engineering guidelines. The technical description includes
measurement of neighboring WCDMA cells, GSM/WCDMA inter-RAT cell
reselection, and GSM/WCDMA inter-RAT CS/PS handover. The
nteroperability Between GSM and WCDMA feature involves the
following features: ! GBFD-114301 GSM/WCDMA nteroperability !
GBFD-114321 GSM/WCDMA Service Based Handover ! GBFD-114322
GSM/WCDMA Load Based Handover ! GBFD-114323 2G/3G Cell Reselection
Based on MS State ! GBFD-114325 Fast WCDMA Reselection at 2G CS
Call Release ! GBFD-511101 Load Based Handover Enhancement on ur-g
! GBFD-511102 NACC Procedure Optimization Based on ur-g !
GBFD-511103 GSM and WCDMA Load Balancing Based on ur-g !
GBFD-511104 GSM and WCDMA Traffic Steering Based on ur-g !
GBFD-119502 PS Handover ! GBFD-116201 Network-Controlled Cell
Reselection (NC2) The following features are described in this
document: ! GBFD-114301 GSM/WCDMA nteroperability ! GBFD-114321
GSM/WCDMA Service Based Handover ! GBFD-114322 GSM/WCDMA Load Based
Handover ! GBFD-114323 2G/3G Cell Reselection Based on MS State !
GBFD-114325 Fast WCDMA Reselection at 2G CS Call Release !
GBFD-119502 PS Handover ! GBFD-116201 Network-Controlled Cell
Reselection (NC2) The following features are described in the
Common Radio Resource Management Feature Parameter Description: !
GBFD-511101 Load Based Handover Enhancement on ur-g ! GBFD-511102
NACC Procedure Optimization Based on ur-g ! GBFD-511103 GSM and
WCDMA Load Balancing Based on ur-g ! GBFD-511104 GSM and WCDMA
Traffic Steering Based on ur-g 1.2 Intended Audience This document
is intended for: ! Personnel who need to understand the
nteroperability Between GSM and WCDMA feature ! Personnel who work
with Huawei GSM products 1.3 Change History This section provides
information about the changes in different document versions. There
are two types of changes, which are defined as follows: ! Feature
change: refers to a change in the nteroperability Between GSM and
WCDMA feature of a specific product version. ! Editorial change:
refers to a change in wording or the addition of information that
was not described in the earlier version. Document Issues The
document issue is as follows: ! 02 (2012-06-30) ! 01 (2011-03-31) !
Draft A (2011-01-15) 02(2012-06-30) This is the second release of
GBSS13.0. Compared with issue 01 (2011-03-31) of GBSS13.0, issue 02
(2012-06-30) of GBSS13.0 incorporates the changes described in the
following table. Change TypeChange DescriptionParameter Change
Feature changeNoneNone Editorial changeAdded the following
chapters: ! Chapter 8 Related Features ! Chapter 9 mpact on the
Network ! Chapter 10 Engineering Guidelines Deleted descriptions
about cell reselection based on cell priority. None 01(2011-03-31)
This is the first release of GBSS13.0. Compared with issue Draft A
(2011-01-15) of GBSS13.0, issue 01 (2011-03-31) of GBSS13.0 has no
change. Draft A (2011-01-15) This is the draft release of GBSS13.0.
Compared with issue 01 (2010-06-30) of GBSS12.0, draft A
(2011-01-15) of GBSS13.0 incorporates the changes described in the
following table. Change TypeChange DescriptionParameter Change
Feature change! Added a description of the PS handover between GSM
andWCDMA. ! Added a description of the NC2 between GSM and WCDMA.
The added parameters are listed as follows: ! SPTINTERRATINBSCPSHO
! SPTINTERRATOUTBSCPSHO ! PFCSUP ! NACCSPT ! NCO ! FDDFREQCNUM !
FDDCELLOFF ! FDDCELLTHRED ! TrafficReselAllow Editorial changeThe
following contents are optimized: ! GSM-to-WCDMA cell reselection.
! GSM-to-WCDMA CS handover. ! Setting of GSM and WCDMAconfiguration
parameters. None
2 Overview WCDMA and GSM will coexist for a long time.
Therefore, Huawei GSM BSS provides GSM/WCDMA interoperability,
which allows inter-RAT handovers and inter-RAT cell reselections
between GSM and WCDMA. GSM/WCDMA interoperability supports smooth
evolution from GSM to WCDMA, which helps reduce operators' capital
expenditure (CAPEX). This feature provides operators with both
WCDMA and GSM networks complete support for a seamless coverage
from GSM to WCDMA. For example, with the cell reselection or
handover function, operators can keep providing services for a
dual-mode MS that moves away from the WCDMA coverage, thereby
improving user experience. n areas covered by both GSM and WCDMA
networks, nteroperability between GSM and WCDMA balances traffic
loads between two networks. For example, when the traffic load in a
GSM cell is too high, nteroperability between GSM and WCDMA can
hand over some calls in the GSM cell to a WCDMA cell.
nteroperability between GSM and WCDMA also allows operators to set
different service access policies in areas covered by both GSM and
WCDMA networks. For example,GSM is preferentially selected for
handling CS services and WCDMA for PS services. All MSs mentioned
in this document are multi-mode MSs that support both GSM and
WCDMA. 3 Iur-g Interface Between GSM and WCDMA 3.1 Introduction to
the Iur-g Interface Load information exchange is a prerequisite for
the nteroperability Between GSM and WCDMA feature. Load information
exchange consists of the following types: ! Load information
exchange through the core network (CN): Load information, which is
carried in the information elements (Es) in the signaling for
handovers, is exchanged between the GSM BSC over the A interface
and the WCDMA RNC over the u interface. n this situation, load
information exchanges irregularly. Therefore, unnecessary handover
attempts may occur. ! Load information exchange through the ur-g
interface: Load information is exchanged between the GSM BSC and
the WCDMA RNC through the ur-g interface instead of the CN. Through
the ur-g interface, the GSM BSC and WCDMA RNC can exchange load
information with each other by performing information exchange and
common measurement. This simplifies the GSM/WCDMA interoperability
procedure, shortens the handover delay, and increases the handover
success rate. Figure 3-1 shows the position of the ur-g interface
on a network. Figure 3-1 Position of the ur-g interface on a
network Figure 3-2 shows the protocol stack defined in 3GPP
specifications for the ur-g interface. Figure 3-2 Protocol stack
defined in 3GPP specifications for the ur-g interface
The ur-g interface has a control plane and does not have a user
plane. The ur-g interface uses P transmission. There is an ur-g
interface instance between each remote RNC and a local BSC. The
ur-g interface supports common measurement and information exchange
procedures. These two procedures are performed through
connection-oriented signaling. 3.2 Common Measurement Common
measurement is based on the ur-g interface. The procedures of
common measurement are performed through connection-oriented
signaling. Common measurement is enabled if SPTCOMMMEAS is set to
Yes. Common measurement involves the following procedures: 1.
Common measurement initialization The source BSC/RNC sends a COMMON
MEASUREMENT NTATON REQUEST message to the target RNC/BSC to
initialize the common measurement initialization procedure,
requesting the target RNC/BSC to periodically report the load
information about its neighboring cells. f the target RNC/BSC
supports common measurement, it responds with a COMMON MEASUREMENT
NTATON RESPOSE message, as shown in Figure 3-3. Figure 3-3
Successful common measurement initialization
f the target RNC/BSC does not support common measurement or
rejects the common measurement request, it responds with a COMMON
MEASUREMENT NTATON FALURE message, as shown in Figure 3-4. Figure
3-4 Failed common measurement initialization
2. Periodic common measurement reporting After a common
measurement is successfully initialized, the target RNC/BSC
periodically sends COMMON MEASUREMENT REPORT messages to the source
BSC/RNC toreport the load information about neighboring cells, as
shown in Figure 3-5. Figure 3-5 Common measurement reporting
procedure
f a neighboring cell is faulty, blocked, removed, or
deactivated, the target RNC/BSC sends a COMMON MEASUREMENT FALURE
NDCATON message to the source BSC/RNC, notifying the source BSC/RNC
that the common measurement procedure has failed and must be
terminated, as shown in Figure 3-6. Figure 3-6 Failed common
measurement
3.3 Information Exchange During a common measurement procedure,
the ur-g interface carries the load information about GSM and WCDMA
cells, the inter-RAT CS service handover support flags of GSM
cells, and the inter-RAT PS service handover support flags of GSM
cells. This section uses load information about GSM cells as an
example. The information exchange is enabled if SPTINFOEXCHG is set
to Yes and INFOEXCHGLIST is set to CELLCAPCLASS. The load state of
a cell can be normal, basic congestion, or overload congestion.
Table 3-1 describes the rules for determining the load states of
GSM cells. TabIe 3-1 Rules for determining the load states of GSM
cells UpIink/DownIinkIf...Then the Load State of the CeII Is.
UplinkUplink load < UlLdrThrd2GCellNormal UlLdrThrd2GCell >
Uplink load Downlink load RLA_C + FDDQOFF ! CPCH Ec/No < FDDQMIN
- FDDQMINOFFSET ! CPCH RSCP < FDD_RSCP_threshold n WCDMA, Ec/No
is the ratio of energy per modulating bit to the noise spectral
density. t is equivalent to C/ in GSM. Where, ! RLA_C is the
average receive level. n a GSM-to-WCDMA cell reselection, the RSCP
of the neighboring WCDMA cell must meet the following requirements:
! RSCP > Average receive level of the serving cell + FDDQOFF !
RSCP > Receive level of each neighboring GSM cell + FDDQOFF!
FDDQOFF is the receive level difference between the candidate WCDMA
cell and the serving GSM cell. This parameter is a key factor for
controlling the GSM-to-WCDMA cell reselection. The greater the
value of FDDQOFF is, the more difficult it is for the GSM-to-WCDMA
cell reselection condition to be met, and more MSs will camp on
theGSM cell. ! FDDQMIN is the minimum Ec/No threshold for
GSM-to-WCDMA cell reselection. The greater the value of FDDQMIN is,
the more difficult it is to meet the cell reselection condition.
FDDQMINOFFSET is offset of the minimum Ec/No threshold for
GSM-to-WCDMA cell reselection. An MS determines the minimum receive
level of a candidateWCDMA cell for cell reselection based on
FDDQMIN and FDDQMINOFFSET. That is, FDDQMIN and FDDQMINOFFSET do
not determine the cell reselection from GSM toWCDMA directly but
guarantee the signal quality of the candidate WCDMA cell. !
FDD_RSCP_threshold is calculated as follows: ! f FDD_RSCPmin is
broadcast in the serving cell, then FDD_RSCP_threshold = FDDRSCPMIN
- min((P_MAX - 21 dBm), 3 dB). ! f FDD_RSCPmin is not broadcast in
the serving cell and Qrxlevmin and Pcompensation can be obtained in
the serving cell, then FDD_RSCP_threshold = Qrxlevmin +
Pcompensation + 10 dB ! f FDD_RSCPmin is not broadcast in the
serving cell and Qrxlevmin and Pcompensation cannot be obtained in
the serving cell, then FDD_RSCP_threshold = -102dBm (the default
value of FDD_RSCPmin). Where, ! P_MAX is the maximum RF output
power of an MS in a WCDMA cell. ! Qrxlevmin is the minimum required
RX level in a WCDMA cell. ! Pcompensation is max(UE_TXPWR_MAX_RACH
P_MAX, 0). ! UE_TXPWR_MAX_RACH is the maximum TX power level an MS
may use when accessing a WCDMA cell on RACH. ! FDDRSCPMIN is used
to calculate the FDD_RSCP_threshold of the target cell for a
GSM-to-WCDMA cell reselection. f multiple WCDMA cells meet the cell
reselection conditions, the MS selects the cell with the highest
RSCP as the target cell. The GSM-to-WCDMA cell reselection cannot
be triggered within five seconds after the WCDMA-to-GSM cell
reselection. n case of a cell reselection occurring within the
previous 15 seconds, FDDQOFF is increased by 5 dB. f both the
conditions for the GSM-to-WCDMA cell reselection and those for the
GSM-to-GSM cell reselection are met, the MS selects a WCDMA cell as
the target cell. 5.2.2 Fast WCDMA ReseIection at 2G CS CaII ReIease
This section describes the feature GBFD-114325 Fast WCDMA
Reselection at 2G CS Call Release Overview When an MS terminates a
call in the GSM network, it camps on the cell in which the call is
released and then starts neighboring cell measurement. When a
neighboringWCDMA cell meets the requirements for cell reselection,
the MS reselects the WCDMA cell. The WCDMA cell reselection is
initiated after the MS receives the S and performs the related
calculation. When the feature Fast WCDMA Reselection at 2G CS Call
Release is activated, the BSS selects the best neighboring WCDMA
cell based on the measurement information after the MS in a GSM
cell terminates a CS call. Then, the BSS sends the MS the cell
information through the Channel Release message, instructing the MS
to camp on thatWCDMA cell. With this feature, an MS can camp on a
WCDMA cell without performing cell reselection decisions,
accelerating cell reselection. This feature allows the MS tocamp on
the WCDMA cell for a longer period. n addition, the number of
location area updates is reduced, and the paging success rate is
increased, increasing the revenue of operators in the WCDMA
network. The WCDMA network in this document refers to the UTRAN
FDD. FDD stands for frequency division duplex (FDD). Procedure
After an MS in a GSM cell releases a CS call, the BSC sends the MS
a Channel Release message that carries the E "Cell selection
indicator after release of all TCH and SDCCH". This E carries the
neighboring WCDMA cell information, facilitating the MS to reselect
a WCDMA cell. This feature needs the support of both the network
and the MS. Figure 5-2 shows the cell reselection procedure for an
MS-terminated call. Figure 5-2 Procedure for fast WCDMA reselection
at 2G CS call release
1. After receiving a Release Complete message from the MS, the
MSC sends a Clear Command message to the BSC, instructing the BSC
to release the occupied resources on the A and Um interfaces. 2.
The BSC sends a Channel Release message to the MS, instructing the
MS to release the TCH or SDCCH on the Um interface. The Channel
Release message may carry the E "Cell selection indicator after
release of all TCH and SDCCH", which contains the information about
the target neighboring WCDMA cell. The MS in the serving GSM cell
measures neighboring cells. If...Then... The information about
neighboring WCDMAcells is carried in a measurement report (MR) The
BSC carries the information (including FDD-ARFCN and
FDD_CELL_NFORMATON) about the best neighboring WCDMA cell in the
Channel Release message, instructing the MS to reselect that
neighboring WCDMA cell. No neighboring WCDMA cell information is
carried in an MR or the value ofCELLSELECTAFTERCALLREL is NO(No)
The BSC does not carry the E "Cell selection indicator after
release of all TCH and SDCCH" in the Channel Release message.
3. After receiving the Channel Release message, the MS releases
the main signaling link. Then, the MS sends a DSC frame to the BTS,
instructing the BTS to release the TCH or SDCCH. 4. After receiving
an Unnumbered Acknowledgement message, the MS switches to idle mode
and initiates cell reselection based on the E "Cell selection
indicator after release of all TCH and SDCCH". If...Then... The
Channel Release message contains the E "Cell selection indicator
after release of all TCH and SDCCH"
The MS attempts to camp on the cell indicated in the Channel
Release message. The Channel Release message does not contain the E
"Cell selection indicator after release of all TCH and SDCCH" The
MS attempts to camp on the cell where the TCH or SDCCH is already
released.
5. f step 4 fails, the MS performs a normal cell reselection
procedure to camp on any appropriate cells. 5.2.3 NC2 between GSM
and WCDMA This section describes the feature GBFD-116201 NC2
between GSM and WCDMA. NC2 cell reselection can be performed for
inter-RAT cell reselection only when an MS is in packet transfer
mode. NC2 cell reselection between GSM and WCDMA refers to the
network-controlled cell reselection from GSM to WCDMA triggered by
a BSC. NC2 cell reselection is activated after the NCO parameter is
set to NC2(NC2). n NC2 cell reselection mode, an MS generally
determines whether to measure neighboring WCDMA cells based on the
value of QI and the receive level of the serving cell. f any of the
following conditions are met, the MS determines whether to measure
neighboring WCDMA cells based on the value of QP and the receive
level of the serving cell: ! The serving GSM cell has a PBCCH, and
QP is broadcast on the PBCCH. ! The serving GSM cell does not have
a PBCCH but QP is broadcast on the BCCH. n addition, MSs have
received the Packet Cell Change Order message or the Packet
Measurement Order message that carries the GPRS cell reselection
parameters of one or more WCDMA cells. n NC2 cell reselection mode,
an MS performs inter-RAT neighboring WCDMA cell measurements based
on QP, FDDFREQCNUM, FDDCELLOFF, and FDDCELLTHRED and sends MRs. !
QP is the threshold for an MS in PS mode to search for WCDMA cells.
f the level of the serving GSM cell is lower than the value of QP
(when QP is within the range of 0 to6) or higher than the value of
QP (when QP is within the range of 8 to 14), the MS starts to
search for WCDMA cells. ! FDDFREQCNUM is the number of WCDMA cells
that should be contained in the best cell list, which is carried in
the MR from an MS. ! FDDCELLOFF is the receive level offset for
WCDMA cells. During the ranking of measured neighboring cells, the
value of this parameter is added to the receive level of measured
WCDMA cells. ! FDDCELLTHRED is the threshold for reporting a WCDMA
cell. The MS reports only the cells whose RSCP is greater than this
threshold. Figure 5-3 shows the procedure for NC2 cell reselection
between GSM and WCDMA. Figure 5-3 Procedure for NC2 cell
reselection between GSM and WCDMA
1.
AnMSintheGPRSMobilityManagement(GMM)ReadystateperiodicallysendsPacket
MeasurementReportmessagesorPacketEnhancedMeasurementReportmessages
to the BSC. These MRs contain the RSCP of neighboring WCDMA cells.
2.
AfterreceivingapacketMR,theBSCprocessesthemeasurementresults.Then,theBSC
determines whether to perform a cell reselection. 3.
ftheBSCdetermines to
initiateacellreselection,itsendsthePacketCellChangeOrder message to
theMS to instructtheMS to reselectthespecifiedtarget
WCDMAcell.Targetcell reselection is based on the NC2 cell
reselection algorithm. 4.
facellreselectionfails,theMSsendsthePacketCellChangeFailuremessage
to theBSC. Afterreceivingthismessage,theBSCsubtracts PENALTYRXLEV
fromthereceivelevelofthe target cell. f the receive level of the
target cell is less than PENALTYRXLEV, the BSC sets the receive
level of the target cell to 0. The NC2 cell reselection algorithms
include the service-based NC2 cell reselection algorithm,
quality-based NC2 cell reselection algorithm, load-based NC2 cell
reselection algorithm. Service-Based NC2 CeII ReseIection AIgorithm
The service-based NC2 cell reselection is activated when
TrafficReselAllow is set to PERMIT(Permit). The BSC may find the E
"Service UTRAN CCO" in multiple DL-UNTDATA PDUs, CREATE-BSS-PFC
PDUs, or PS-HANDOVER-REQUEST PDUs sent from the SGSN. The BSS
considers that the last received E "Service UTRAN CCO" is of the
highest priority. The E "Service UTRAN CCO" carries Service UTRAN
CCO VaIue part, which indicates the most suitable RAT for the
current service. Table 5-1 lists the values of Service UTRAN CCO
VaIue part and their meanings. TabIe 5-1 Values of Service UTRAN
CCO Value part and their meanings Coding BitsMeaning 000Network
initiated cell change order to UTRAN or PS handover to UTRAN
procedure should be performed 001Network initiated cell change
order to UTRAN or PS handover to UTRAN procedure should not be
performed 010Network initiated cell change order to UTRAN or PS
handover to UTRAN procedure should not be performed 111f received,
should be interpreted as no information available (bits 4-5 valid)
Other valuesf received, should be interpreted as no information
available
f the value of Service UTRAN CCO VaIue part is 000, the MS
triggers a service-based cell reselection and selects the
neighboring WCDMA cell with the highest receive level. f no
neighboring WCDMA cell is available, the MS proceeds to perform a
quality-based, load-based, or coverage-based NC2 cell reselection.
QuaIity-Based NC2 CeII ReseIection AIgorithm The quality-based NC2
cell reselection is activated when URGENTRESELALLOW is set to
PERMIT(Permit). When the conditions for triggering a service-based
NC2 cell reselection are not met, the BSC determines whether to
initiate a cell reselection based on the receive quality of the
radio link on the Um interface. The MRs or Bit Error Rate (BER)
indicates the receive quality on the radio link and the number of
times bad radio link quality occurs. n a receive quality
measurement period, if the MS receive quality deterioration ratio
is greater than the CELLRXQUALWORSENRATIOTHRSH parameter, a
quality-based NC2 cell reselection is initiated. ! MS receive
quality deterioration ratio = Times of bad radio link
quality/Number of radio link quality MRs n quality-based NC2 cell
reselection, the cell with the highest priority is selected as the
target cell from candidate GSM cells. The priority of a cell is
determined by its receive level and characteristics information
such as cell type and support for EDGE. n quality-based NC2 cell
reselection, the candidate WCDMA cell with the highest receive
level is selected as the target cell. f NC2LoadResel is set to
Support(Support), the cell characteristics information also
includes the load of the candidate GSMcells under the same BSC. n
quality-based NC2 cell reselection, a candidate cell must meet the
following conditions: ! Receive level of the neighboring GSM
candidate cell > Max(Receive level of the serving cell,
MINACCRXLEV) + RESELHYST. ! Measured RSCP of the neighboring WCDMA
cell > FDDRSCPQUALTHRSH. ! When NC2LoadResel is set to
Support(Support), the neighboring GSM candidate cells under the
same BSC are not congested. ! When Service UTRAN CCO VaIue part is
set to 010 or 001, none of the neighboring WCDMA cells is selected
as the target cell. Then, the highest level candidate cell within
the highest priority cells is selected as the target cell. f a
neighboring WCDMA cell is selected, an NC2 cell reselection fromGSM
to WCDMA is triggered. Load-Based NC2 CeII ReseIection AIgorithm
The load-based NC2 cell reselection algorithm is activated when
LOADRESELALLOW is set to PERMIT(Permit). When neither the
conditions for initiating a service-based NC2 cell reselection nor
the conditions for initiating a quality-based NC2 cell reselection
are met, a load-based NC2 cell reselection is initiated to balance
the load among the cells in the network. n load-based NC2 cell
reselection, some MSs in cells with heavy load are reselected
tocells with light load. n addition, the MSs in neighboring cells
should not be reselected to these heavily-loaded cells. Figure 5-4
shows a load-based NC2 cell reselection. Figure 5-4 Load-based NC2
cell reselection
When the serving cell is overloaded and the receive level in
this cell is lower than LOADRESELMAXRXLEV, load-based NC2 cell
reselection is triggered. ! f the channel multiplexing rate of a
cell is higher than LOADRESELSTARTTHRSH, the cell load is heavy.
Then, the load-based NC2 cell reselection should be enabled. ! n a
load-based NC2 cell reselection, only the MS whose signal level is
lower than LOADRESELMAXRXLEV can be reselected to a neighboring
cell. n load-based NC2 cell reselection, the cell with the highest
priority is selected as the target cell from the candidate GSM
cells. The priority of a cell is determined by its receive level
and characteristics information such as cell type and support for
EDGE. Alternatively, the candidate WCDMA cell with the highest
receive level is selected as the target cell. f NC2LoadResel is set
to Support(Support), the characteristics information about a cell
also includes the load of GSM candidate cells under the same BSC. n
load-based NC2 cell reselection, a candidate cell must meet the
following conditions: ! Receive level of the neighboring GSM cell
> Max(Receive level of the serving cell, MINACCRXLEV) +
RESELHYST. ! Measured RSCP of the neighboring WCDMA cell >
FDDRSCPQUALTHRSH. ! When NC2LoadResel is set to Support(Support),
the neighboring GSM candidate cells under the same BSC are not
congested. ! When Service UTRAN CCO VaIue part is set to 010 or
001, none of the neighboring WCDMA cells can be selected as the
candidate cell. Then, the highest level candidate cell within the
highest priority cells is selected as the target cell. f a
neighboring WCDMA cell is selected, an NC2 cell reselection fromGSM
to WCDMA is triggered. Coverage-Based NC2 CeII ReseIection
AIgorithm Coverage-based NC2 cell reselection is activated when
NORMALRESELALLOW is set to PERMIT(Permit). When none of the
conditions for initiating a service-based, quality-based, and
load-based NC2 cell reselection are met and the P/N criterion for
initiating a coverage-based NC2 cell reselection is met, a
coverage-based NC2 cell reselection is initiated. The P/N criterion
for initiating a coverage-based NC2 cell reselection is as follows:
n the period specified by RESELWATCHPERIOD, the number of times
that the receive level of the serving cell is lower than the value
of MINACCRXLEV reaches the value of RESELWORSENLEVTHRSH. n
coverage-based NC2 cell reselection, the cell with the highest
priority is selected as the target cell from the candidate GSM
cells. The priority of a cell is determined by its receive level
and characteristics information such as cell type and support for
EDGE. Or, the candidate WCDMA cell with the highest receive level
is selected as the target cell. f NC2LoadResel is set to
Support(Support), the characteristics information about a cell also
includes the load of the GSM candidate cells under the same BSC. n
coverage-based NC2 cell reselection, a candidate cell must meet the
following conditions: ! Receive level of the neighboring GSM
candidate cell > Max(Receive level of the serving cell,
MINACCRXLEV) + RESELHYST. ! Measured RSCP of the neighboring WCDMA
candidate cell > FDDRSCPQUALTHRSH. ! When NC2LoadResel is set to
Support(Support), the neighboring GSM candidate cell under the same
BSC are not congested. ! When Service UTRAN CCO VaIue part is set
to 010 or 001, none of the neighboring WCDMA cells can be selected
as the candidate cell. Then, the highest level candidate cell
within the highest priority cells is selected as the target cell. f
a neighboring WCDMA cell is selected, an NC2 cell reselection
fromGSM to WCDMA is triggered.
6 GSM/WCDMA Inter-RAT CS Handover GSM/WCDMA interoperability for
MSs in dedicated mode involves GSM-to-WCDMA handover and
WCDMA-to-GSM handover. Handovers are implemented by MSs and the
BSS. GSM/WCDMA inter-RAT handovers include emergency handovers,
better cell handovers, load-based inter-RAT handovers, and
service-based inter-RAT handovers. Emergency handover is triggered
when an ongoing call initiated by a multi-mode MS can no longer be
processed in its serving cell due to limited network coverage or
other factors. For example, when an MS making a call in the GSM
cell edge is about to move outside the cell, an emergency handover
is triggered to avoid call drops. For details, see the Handover
Feature Parameter Description. Better cell handover is triggered
when the signal quality of a neighboring cell is better than that
of the serving cell. Better cell handovers help improve service
quality and user experience. For example, when the signal quality
of a WCDMA cell is better than that of the serving GSM cell, MSs in
the serving cell can be handed over to theWCDMA cell to achieve
higher voice quality. For details, see the Handover Feature
Parameter Description. Load-based inter-RAT handover is triggered
when the traffic load on the serving cell is too high. For a
WCDMA-to-GSM load-based handover, if the traffic load on the
targetGSM cell is also high, the target cell rejects the handover
to avoid ping-pong handovers. Service-based handover allows an
operator to use the MSC to choose a network for MSs. f the MSC
indicates that a service-based handover should be performed on a
call in a GSM cell, the BSS hands over the call to a WCDMA cell. f
the MSC indicates that a call should not be handed over to a WCDMA
call, the BSS does not hand over the call to a WCDMA cell when a
handover is needed during the call. 6.1 CS Handover from WCDMA to
GSM MSs in dedicated mode can be handed over from a WCDMA cell to a
GSM cell. The handover decision and handover procedure are
controlled by the RNC. The BSS considers the handover from WCDMA to
GSM as a general inter-BSC handover. The handover from WCDMA to GSM
is supported when INTERRATINBSCHOEN is set to YES(Yes). 6.2 CS
Handover from GSM to WCDMA 6.2.1 Overview Handover from GSM to
WCDMA is supported when INTERRATOUTBSCHOEN is set to YES(Yes). The
BSS determines whether to initiate an inter-RAT handover from GSM
to WCDMA. The process is as follows: 1.
AnMSindedicatedmodeobtainstheneighboring WCDMA
celllistandotherinformationfrom measurement information. 2. The MS
reports the measurement result to the BSS through an MR. 3. After
receiving the measurement result, the BSS determines whether to
initiate a handover based on the measurement result and the
handover algorithm. nter-RAT handover from GSM to WCDMA can be
classified into emergency handover and better 3G cell handover. The
algorithm for emergency handover from GSM toWCDMA is the same as
that for general emergency handover. For details, see the Handover
Feature Parameter Description. n the GSM network, the HOOPTSEL
parameter specifies whether a GSM cell or a WCDMA cell is
preferentially selected as the target cell. ! f HOOPTSEL is set to
Pre_2G_CeII(Preference for 2G ceII), the BSC preferentially selects
a GSM cell as the target cell. ! f HOOPTSEL is set to
Pre_3G_CeII(Preference for 3G ceII), the BSC preferentially selects
a WCDMA cell as the target cell. ! f HOOPTSEL is set to
Pre_2G_CeIIThres(Preference 2G ceII by thresh), the BSC determines
the target cell according to the receive level of the neighboring
GSMcells and the value of HOPRETH2G. f the receive level of all
neighboring GSM cells is lower than HOPRETH2G, the BSC selects a
WCDMA cell as the target cell. Better 3G cell handover can be
performed only when both INTERRATOUTBSCHOEN and BET3GHOEN are set
to YES(Yes). As the measurement result of a WCDMA cell can be
reported in the format of RSCP or Ec/No, the methods for handover
decision differ accordingly. ! When the value of FDDREP is
RSCP(RSCP), the better 3G cell handover is triggered if during
HOSTAT3G, the following condition is met for the period specified
byHODURT3G: CPCH RSCP > HORSCPTH3G ! When the value of FDDREP is
EcN0(Ec/N0), the better 3G cell handover is triggered if the
following condition is met for the period specified by HODURT3G
withinHOSTAT3G: CPCH Ec/No > HOECNOTH3G 6.3 Service-Based CS
Handover from GSM to WCDMA This section describes the feature
GBFD-114321 GSM/WCDMA Load Based Handover. 6.3.1 Overview Operators
can provide more diversified services when GSM and WCDMA coexist in
a mixed network. Services of different types can be carried on
different networks tooptimize the utilization of resources. For
example, voice services and low-rate data services are carried on
the GSM network, and high-rate data services are carried on
theWCDMA network to allow high peak throughput. 6.3.2 Procedure f
INTERRATOUTBSCHOEN is set to YES(Yes), the BSC applies different
handover algorithms for MSs to be handed over from a GSM cell to a
WCDMA cell according tothe setting of InterRatServiceLoadHoSwitch.
! f InterRatServiceLoadHoSwitch is set to CnService-based(CN
Service-based), the BSC processes handovers according to the
service handover attributes of the core network (CN) as follows: !
f the service handover indicator of the CN is Handover to UTRAN or
cdma2000 shouId be performed, the MS should be handed over to a
WCDMA cell. n this case, the BSC selects a WCDMA cell from the
neighboring cell list as the target cell and starts the handover
from GSM to WCDMA. ! f the service handover indicator of the CN is
Handover to UTRAN or cdma2000 shouId not be performed, a GSM cell
should be preferentially selected as the serving cell. n this case,
the BSC does not start the handover from GSM to WCDMA. f a handover
is required during the call, a GSM cell is preferentially selected
as the target cell. ! f the service handover indicator of the CN is
Handover to UTRAN or cdma2000 shaII not be performed, the MS must
not be handed over to a WCDMA cell. n this case, the BSC will not
hand over the MS to a WCDMA cell, and selects only a GSM cell as
the target cell if a handover is required. ! f
InterRatServiceLoadHoSwitch is set to Service-based(Service-based),
the BSC removes the WCDMA candidate cell whose uplink/downlink
traffic is in the minor congestion level. f the MS is performing a
CS service, the MS accesses the current GSM cell. ! f
InterRatServiceLoadHoSwitch is set to Load-based(Load-based) and
the value of the E "Service Handover" in the ASSGNMENT REQUEST
message sent from the CN is handover to UTRAN or cdma2000 shouId be
performed, the BSC selects a neighboring WCDMA cell whose uplink
and downlink loads meet the following condition from WCDMA
candidate cells: G2GLoadAdjustCoeff x Load of the current GSM
serving cell 10 x Load of the neighboring WCDMA cell < 10 x
G2G3GLdBlcDeltaThrd 1000 f multiple neighboring WCDMA cells meet
the preceding condition, the BSC starts the directed retry to the
WCDMA cell with the highest receive quality. f no neighboringWCDMA
cell meets the preceding condition, the BSC selects a GSM cell as
the target cell. ! f there is no WCDMA candidate cell, or the
directed retry to the WCDMA cell fails, the BSC starts the
reassignment procedure to a GSM cell. ! When
nterRatServiceLoadHoSwitch is set to Dynamic-based(Dynamic
Service/Load-based):f the current cell has a normal load, the
service-based WCDMA-to-GSMhandover algorithm is applied. f the
current cell has a high load, the load-based WCDMA-to-GSM handover
algorithm is applied. 6.4 Load-Based CS Handover from GSM to WCDMA
This section describes the feature GBFD-114322 GSM/WCDMA Load Based
Handover. 6.4.1 Overview n a mixed network where GSM and WCDMA
coexist, MSs in connected mode can be handed over between GSM and
WCDMA to balance the overall network load and enlarge system
capacity. f the GSM cell that the MS camps on is congested, the BSC
redirects the MS to the WCDMA network according to the load of the
WCDMA network. 6.4.2 Procedure f both INTERRATOUTBSCHOEN and
OutSysLoadHoEn are set to YES(Yes), the following conditions must
be met to trigger the handover between GSM and WCDMA for MSs in
connected mode: ! The flow control level of the current system is
smaller than or equal to SYSFLOWLEV. ! The load on the serving cell
is greater than or equal to TRIGTHRES. ! The Service Handover
attribute of the service is not handover to UTRAN or cdma2000 shaII
not be performed. A candidate WCDMA cell must meet the following
conditions: ! G2GLoadAdjustCoeff x Load of the current GSM serving
cell 10 x Load of the neighboring WCDMA cell < 10 x
G2G3GLdBlcDeltaThrd 1000 ! For a WCDMA FDD cell, the following
conditions must be met if FDDREP is set to RSCP(RSCP): !
InterRATLoadHoRSCPStart InterRATLoadHoRSCPBandWidth < CPCH RSCP
< InterRATLoadHoRSCPStart! CPCH RSCP > IntRATLoadHORSCPThr !
For a WCDMA FDD cell, the following conditions must be met if
FDDREP is set to EcN0(Ec/N0): ! InterRATLoadHoEcNoStart
InterRATLoadHoEcNoBandWidth < CPCH Ec/No <
InterRATLoadHoEcNoStart ! CPCH Ec/No > IntRATLoadHOEcNoThr Cells
that do not meet the preceding conditions are removed from the
candidate WCDMA cell list. f there are multiple cells in the
candidate cell list, the BSC selects the cell with the highest
receive level. 7 GSM/WCDMA Inter-RAT PS Handover This section
describes the feature GBFD-119502 PS Handover Between GSM and
WCDMA. PS handover is introduced in 3GPP Release 6. This feature
involves WCDMA-to-GSM and GSM-to-WCDMA PS handovers. 7.1
WCDMA-to-GSM PS Handover 7.1.1 Overview WCDMA-to-GSM PS handovers
are initiated by the RNC. PS handovers have two phases: handover
preparation and handover execution. On the BSS side, the
preparation and execution procedures for WCDMA-to-GSM PS handovers
are the same as those for inter-BSC handovers in the GSM system.
WCDMA-to-GSM PS handovers are supported when SPTINTERRATINBSCPSHO
is set to SUPPORT(Support). 7.1.2 Procedure This section uses an
inter-SGSN WCDMA-to-GSM PS handover as an example. The procedures
for the intra-SGSN and inter-SGSN WCDMA-to-GSM PS handovers are
similar. The only difference is that during intra-SGSN WCDMA-to-GSM
PS handover, there is no inter-SGSN signaling interaction because
the GSM cell and the WCDMA cell use the same SGSN. Figure 7-1 shows
the signaling procedure during handover preparation. Figure 7-1
WCDMA-to-GSM PS handover preparation
1. The RNC makes the decision to perform a handover to a GSM
cell. 2. The RNC sends a Relocation Required message to the 3G
SGSN, with the E "Relocation Type" set to UE InvoIved in reIocation
of SRNS. 3. The 3G SGSN checks the E "Target Cell dentifier" and
determines that the handover is an inter-RAT handover. Then, the 3G
SGSN sends a Forward Relocation Request message to the 2G SGSN of
the target cell. 4. The 2G SGSN sends a PS Handover Request message
to the BSS, requesting the BSS to reserve resources for the
handover. The 2G SGSN then activates the PFC for the handover. 5.
The BSS reserves resources and allocates a TBF for the handover
based on the PFC. 6. The BSS creates the Target BSS to Source BSS
Transparent Container, which contains the PS handover command. 7.
The BSS responds to the 2G SGSN with a PS Handover Request
Acknowledge message and is then ready to receive downlink data. 8.
The 2G SGSN responds with a Forward Relocation Response message.
The handover preparation is complete. Figure 7-2 shows the
signaling procedure during handover execution. Figure 7-2
WCDMA-to-GSM PS handover execution
1. The 3G SGSN receives downlink data from the GGSN and sends
the data to the MS through the RNC. 2. The 3G SGSN sends a
Relocation Command message to the source RNC. 3. The RNC forwards
packet data to the 2G SGSN through the 3G SGSN. 4. The RNC suspends
uplink and downlink data transfer, and sends a Handover From UTRAN
Command message to the MS. After receiving this message, the MS
suspends the uplink data transmission. 5. The RNC sends a Forward
SRNS Context (RAB contexts) message to the 2G SGSN through the 3G
SGSN. Then, the 2G SGSN responds with a Forward SRNS Context
Acknowledge message. 6. The MS executes the handover. n this step,
the MS sends access bursts (ABs) to the target BSS and accesses the
target GSM cell. Then, the MS receives the timing advance (TA) from
the BSS. 7./7a. After accessing the cell, the MS processes the
Non-Access Stratum (NAS) container and then sends an exchange
identifier (XD) Response message to the 2G SGSNto resume the uplink
data transfer. 8. After receiving the first correct RLC/MAC block,
the BSS sends a PS Handover Complete message to inform the 2G SGSN
that the handover is successful. The 2G SGSN then forwards uplink
data to the GGSN. 9. After receiving the PS Handover Complete
message, the 2G SGSN sends a Forward Relocation Complete message to
inform the 3G SGSN that the handover is complete. The 3G SGSN then
responds with a Forward Relocation Complete Acknowledge message.
10. The 2G SGSN sends an Update PDP Context Request message to the
GGSN. The GGSN then updates the PDP context fields and returns an
Update PDP Context Response message. From now on the GGSN sends new
incoming downlink P packets to the 2G SGSN instead of to the 3G
SGSN. 11. The 3G SGSN sends an u Release Command message to the RNC
to release related resources. After sending all necessary data to
the MS, the RNC returns an u Release Complete message to the 3G
SGSN. 12./12a. The 2G SGSN may initiate LLC/SNDCP XD negotiation.
13. The MS starts the routing area update. The handover is
complete. 7.2 GSM-to-WCDMA PS Handover 7.2.1 Overview The
conditions for triggering GSM-to-WCDMA PS handovers are defined in
the GSM system, and the handovers are initiated by the BSC. PS
handovers have two phases: handover preparation and handover
execution. Prerequisites The prerequisites for GSM-to-WCDMA PS
handover are as follows: ! The MS supports PS handover. The radio
access capability reported by the MS contains the PS handover
field, which indicates that the MS supports PS handover. ! The BSC
supports PS handover. The BSC supports PS handover when PSHOSUP is
set to YES(Support), and SPTINTERRATOUTBSCPSHO is set to
SUPPORT(Support). ! NACCSPT is set to YES(Yes) if NCO is set to
NC0(NC0) or NC1(NC1) because NC0 and NC1 are based on NACC. !
NC2SPT is set to YES(Yes) if NCO is set to NC2(NC2). ! The SGSN
supports PS handover. The BVC RESET and BVC RESET ACK messages sent
over the Gb interface contain the Extended Feature Bitmap field,
which specifies whether the Network Service Entity (NSE) supports
PS handover: ! f the BVC RESET or BVC RESET ACK message sent by the
SGSN does not contain the Extended Feature Bitmap field, or if the
Extended Feature Bitmap field specifies that PS handover is not
supported, none of the cells under the NSE of the SGSN support PS
handover. That is, the source cell does not support PS handover. !
f the Extended Feature Bitmap field specifies that PS handover is
supported, all cells under the NSE of the SGSN support PS handover.
That is, the source cell supports PS handover. The BSC and the SGSN
support the PFC procedure. PFCSUP is set to YES(Support). Trigger
Conditions The triggering conditions for GSM-to-WCDMA PS handover
vary according to the setting of NCO: ! When NCO is set to NC0(NC0)
or NC1(NC1): NACCSPT is set to YES(Yes). The MS sends the BSC a
PACKET CELL CHANGE NOTFCATON message, and target cell information
contained in the message indicates that the target cell is a WCDMA
cell. SPTINTERRATOUTBSCPSHO is set to SUPPORT(Support). ! When NCO
is set to NC2(NC2): The MS sends the BSC an MR, and the BSC detects
that the target cell is a WCDMA cell that uses the PS handover
algorithm. SPTINTERRATOUTBSCPSHO is set toSUPPORT(Support).
Handover AIgorithms GSM-to-WCDMA PS handover algorithms are
classified into the service-based handover algorithm, quality-based
handover algorithm, load-based handover algorithm, coverage-based
handover algorithm. Each handover algorithm has the same triggering
conditions and target cell selection mechanism as the corresponding
NC2 cell reselection algorithm. For example, the service-based
handover algorithm has the same triggering conditions and target
cell selection mechanism as the service-based NC2 cell reselection
algorithm. For detailed cell reselection algorithms, see section
5.2.3 "NC2 between GSM and WCDMA." 7.2.2 Procedure On the BSS side,
the GSM-to-WCDMA PS handover procedure is similar to the inter-BSC
PS handover procedure. The differences are as follows: ! The target
cell is a WCDMA cell. ! The PS Handover Required message carries
the Source BSC to Target RNC Transparent Container, which contains
Es such as the MS radio access capability, paging mode, Global TF,
and target cell S request. ! The PS Handover Required Acknowledge
message carries the Source RNC to Target BSC Transparent Container,
which contains Es such as the handover command and target cell S
request. This section uses an inter-SGSN GSM-to-WCDMA PS handover
as an example. The procedures for the intra-SGSN and inter-SGSN
GSM-to-WCDMA PS handovers are similar. The only difference is that
during intra-SGSN GSM-to-WCDMA PS handover, there is no inter-SGSN
signaling interaction because the GSM cell and the WCDMA cell use
the same SGSN. Figure 7-3 shows the signaling procedure during
handover preparation. Figure 7-3 GSM-to-WCDMA PS handover
preparation
1. The source BSS decides to initiate a PS handover to a WCDMA
cell. At this point, both uplink and downlink user data is
transmitted over the following: TBFs between the MS and the source
BSS, BSSGP PFC tunnels between the source BSS and the 2G SGSN, GTP
tunnels between the 2G SGSN and the GGSN. 2. The source BSS sends a
PS Handover Required message, which carries the Target RNC
dentifier information, to the 2G SGSN. 3. After detecting that the
handover is an inter-RAT handover to WCDMA based on the Target RNC
dentifier, the 2G SGSN sends a Forward Relocation Request messageto
the 3G SGSN. 4. The 3G SGSN sends a Relocation Request message to
request the target RNC to reserve resources in the target WCDMA
cell. The target RNC responds with a Relocation Request Acknowledge
message after resources are reserved in the target RNC. 6. The 3G
SGSN sends a Forward Relocation Response message to the 2G SGSN.
The handover preparation is complete. Figure 7-4 shows the
signaling procedure during handover execution. Figure 7-4
GSM-to-WCDMA PS handover execution
1.The 2G SGSN continues to receive downlink and uplink user
plane data. 2. After receiving a Forward Relocation Response
message from the 3G SGSN, the 2G SGSN may forward downlink data to
the target RNC through the 3G SGSN. The target RNC then sends the
data to the MS over the air interface. 3. The2GSGSN
continuesthePShandoverbysendinga PSHandoverRequiredAcknowledge
message to the BSS. Before sending this message, the 2G SGSN, based
on QoS, may suspend downlink data transfer for any PDP contexts. 4.
The 2G SGSN forwards the GTP-U context to the target RNC. 5.
TheBSSsendsaPSHandoverCommandmessagecontainingtheHandover to UTRAN
Command message to the MS, instructing the MS to hand over to the
targetWCDMA cell. 6. The MS accesses the WCDMA cell. 7.
AfterdetectingthattheMShasaccessedthetargetcell,theRNCsendsaRelocationDetect
message to the 3G SGSN. 8. The MS sends a Handover to UTRAN
Complete message to the RNC. 9.
WhenthenewsourceRNC-D+S-RNTaresuccessfullyexchangedwiththeMS,theRNC
sends a Relocation Complete message to inform the 3G SGSN that the
handover is complete. 10. The 3G SGSN sends a Forward Relocation
Complete message to inform the 2G SGSN that the handover is
complete and the reserved resources should be released. 11.
The3GSGSNsendsanUpdatePDPContextRequestmessage to theGGSN. TheGGSN
updates the PDP context fields. After the PDP context fields are
updated, the GGSN sends new incoming downlink P packets to the 3G
SGSN instead of to the 2G SGSN. 12. The 2G SGSN performs the PFC
procedure to release the corresponding resources. 13. The MS
updates the route area. The handover is complete. 8 ReIated
Features FeaturePrerequisite FeatureMutuaIIy ExcIusive Feature
Affected Feature GSM/WCDMAnteroperability NoneNone! When the
GSM/WCDMAnteroperability feature is used with the GBFD-511403
Extended BCCH feature, the delay in a location update after
WCDMA-to-GSM cell reselection decreases and the CS paging success
rate increases. ! When the GSM/WCDMAnteroperability feature is used
with GBFD-114325 Fast WCDMAReselection at 2G CS Call Release, an MS
can reselect a WCDMA cell after releasing a call in a GSM cell.
This reduces the number of location updates and the duration for
the MSto camp on the GSM cell, increases the CS paging success
rate, and improves user experience. FeaturePrerequisite
FeatureMutuaIIy ExcIusive Feature Affected Feature 2G/3G Cell
Reselection Based on MS State NoneGBFD-116201 Network-Controlled
Cell Reselection (NC2) ! When the 2G/3G Cell Reselection Based on
MS State feature is used with the GBFD-511403 Extended BCCH
feature, the delay in a location update after WCDMA-to-GSM cell
reselection decreases and the CS paging success rate increases. !
When the 2G/3G Cell Reselection Based on MS State feature is used
with GBFD-114325 Fast WCDMAReselection at 2G CS Call Release, an MS
can reselect a WCDMA cell after releasing a call in a GSM cell.
This reduces the number of location updates and the duration for
the MSto camp on the GSM cell, increases the CS paging success
rate, and improves user experience. GSM/WCDMAService Based Handover
GBFD-114301GSM/WCDMAnteroperability NoneNone GSM/WCDMALoad Based
Handover GBFD-114301GSM/WCDMAnteroperability NoneNone Fast
WCDMAReselection at 2G CS Call Release
GBFD-114301GSM/WCDMAnteroperability NoneNone
9 Impact on the Network 9.1 GSM/WCDMA InteroperabiIity 9.1.1
Impact on System Capacity The GSM/WCDMA nteroperability feature
allows MSs to hand over to WCDMA cells in areas covered by both GSM
and WCDMA networks. This increases the overall capacities of the
GSM and WCDMA networks. 9.1.2 Impact on Network Performance n areas
covered by both GSM and WCDMA networks, this feature allows MSs to
hand over to WCDMA cells. This increases PS data rates. n areas are
covered by only theGSM network, this feature allows MSs to hand
over to GSM cells. This ensures service continuity. 9.2 GSM/WCDMA
Service Based Handover 9.2.1 Impact on System Capacity The
GSM/WCDMA Service Based Handover feature enables the CN to
appropriately allocate services of different types to the GSM and
WCDMA networks. This increases the overall capacities of the GSM
and WCDMA networks. With this feature, the CN allocates CS services
and low-rate PS services to the GSM network and high-rate PS
services to the WCDMA network. This maximizes the peak throughput.
9.2.2 Impact on Network Performance None 9.3 GSM/WCDMA Load Based
Handover 9.3.1 Impact on System Capacity The GSM/WCDMA Load Based
Handover feature allows MSs to handover from a GSM cell to a WCDMA
cell when the GSM cell is congested. This balances the load between
the GSM and WCDMA networks, improves the overall capacities of the
GSM and WCDMA networks, and prevents the system from being
overloaded. 9.3.2 Impact on Network Performance This feature
decreases the congestion rate in GSM cells. 9.4 2G/3G CeII
ReseIection Based on MS State 9.4.1 Impact on System Capacity The
2G/3G Cell Reselection Based on MS State feature allows MSs to
reselect WCDMA cells in areas covered by both GSM and WCDMA
networks. This increases the overall capacities of the GSM and
WCDMA networks. 9.4.2 Impact on Network Performance n areas covered
by both GSM and WCDMA networks, this feature allows MSs to reselect
WCDMA cells. This increases PS data rates. n areas are covered by
only theGSM network, this feature allows MSs to reselect GSM cells.
This ensures service continuity. 9.5 Fast WCDMA ReseIection at 2G
CS CaII ReIease 9.5.1 Impact on System Capacity The Fast WCDMA
Reselection at 2G CS Call Release feature reduces the duration for
MSs to camp on GSM cells and decreases the number of times that the
MSs initiate services in GSM cells. This increases the overall
capacities of the GSM and WCDMA networks. 9.5.2 Impact on Network
Performance This feature allows MSs to reselect WCDMA cells after
releasing calls in GSM cells. This decreases the number of location
updates and increases the CS paging success rate. 10 Engineering
GuideIines 10.1 When to Use InteroperabiIity Between GSM and WCDMA
10.1.1 GSM/WCDMA InteroperabiIity t is recommended that the
GSM/WCDMA nteroperability feature be used with the following
function: ! Early classmark sending function: Set ECSC to YES(Yes)
to enable this function. With this function, the BSC quickly
determines whether MSs camping on a GSM cell are dual-mode MSs.
10.1.2 GSM/WCDMA Service Based Handover t is recommended that the
GSM/WCDMA Service Based Handover feature be used in scenarios where
both the GSM and WCDMA networks are covered and differentiated QoS
is supported by CS and PS services. With this feature, PS services
are preferentially processed in the WCDMA network, whereas CS
services are still processed in theGSM network. 10.1.3 GSM/WCDMA
Load Based Handover t is recommended that the GSM/WCDMA Load Based
Handover feature be used in scenarios where both the GSM and WCDMA
networks are covered and the GSMnetwork is overloaded. n
coordination with the CN, this feature allocates CS services to the
WCDMA network. This increases the resource usage of the WCDMA
network, decreases the load and interference on the GSM network,
and ensures the QoS of CS services. 10.1.4 2G/3G CeII ReseIection
Based on MS State
When setting inter-RAT cell reselection parameters and handover
thresholds, take note of the correlation between the GSM and
TD-SCDMA parameters to prevent ping-pong cell reselections and
handovers. t is recommended that the 2G/3G Cell Reselection Based
on MS State feature be used with the following function: ! Early
classmark sending function: Set ECSC to YES(Yes) to enable this
function. With this function, the BSC quickly determines whether
MSs camping on a GSM cell are dual-mode MSs. 10.1.5 Fast WCDMA
ReseIection at 2G CS CaII ReIease None 10.2 Information to Be
CoIIected 10.2.1 GSM/WCDMA InteroperabiIity Before deploying the
GSM/WCDMA nteroperability feature, collect the following
information: ! WCDMA network planning information: used for
configuring neighboring cells. ! nteroperability policies for
operators, such as the requirements for setting inter-RAT cell
reselection parameters and whether GSM-to-WCDMA CS handover is
required: used to properly set specific parameters and determine
whether to enable specific functions. 10.2.2 GSM/WCDMA Service
Based Handover Before deploying the GSM/WCDMA Service Based
Handover feature, collect the following information: Whether the CN
for GSM CS services supports GSM/WCDMA service-based handovers:
used to determine whether this feature is allowed. 10.2.3 GSM/WCDMA
Load Based Handover Before deploying the GSM/WCDMA Load Based
Handover feature, collect the following information: Load
information about GSM cells, such as TCH congestion rate and
proportion of TCHHs to all TCHs in GSM cells: used to set
parameters related to this feature. 10.2.4 2G/3G CeII ReseIection
Based on MS State Before deploying the 2G/3G Cell Reselection Based
on MS State feature, collect the following information: ! WCDMA
network planning information: used for configuring neighboring
cells. ! nteroperability policies for operators, such as the
requirements for setting inter-RAT cell reselection parameters and
whether GSM-to-WCDMA CS handover is required: used to properly set
specific parameters and determine whether to enable specific
functions. 10.2.5 2G/3G CeII ReseIection Based on MS State Before
deploying the 2G/3G Cell Reselection Based on MS State feature,
collect the following information: ! The proportion of WCDMA cells
to all cells in specified areas ! Whether GSM/WCDMA dual-mode MSs
are used 10.3 Network PIanning 10.3.1 GSM/WCDMA InteroperabiIity RF
PIanning N/A Network TopoIogy For GSM cells to be enabled with the
GSM/WCDMA nteroperability feature, plan neighboring cell
configurations based on the topology of the adjacent WCDMA network.
AGSM cell can be configured with a maximum of 64 neighboring WCDMA
cells. These neighboring cells can use a maximum of three
frequencies, with each frequency supporting a maximum of 32
neighboring WCDMA cells. Hardware PIanning N/A 10.3.2 GSM/WCDMA
Service Based Handover RF PIanning N/A Network TopoIogy N/A
Hardware PIanning N/A 10.3.3 GSM/WCDMA Load Based Handover RF
PIanning N/A Network TopoIogy N/A Hardware PIanning N/A 10.3.4
2G/3G CeII ReseIection Based on MS State RF PIanning N/A Network
TopoIogy N/A Hardware PIanning N/A 10.3.5 Fast WCDMA ReseIection at
2G CS CaII ReIease RF PIanning N/A Network TopoIogy N/A Hardware
PIanning N/A 10.4 OveraII DepIoyment Procedure The GSM/WCDMA
nteroperability and 2G/3G Cell Reselection Based on MS State
features, which are basic features, need to be deployed
preferentially. Other features are optional and can be enabled
based on individual needs. 10.5 DepIoying GSM/WCDMA
InteroperabiIity For details about how to activate, verify, and
deactivate this feature, see Configuring GSM/WCDMA
Interoperability. 10.6 DepIoying 2G/3G CeII ReseIection Based on MS
State For details about how to activate, verify, and deactivate
this feature, see Configuring 2G/3G Cell Reselection Based on MS
State. 10.7 DepIoying GSM/WCDMA Service Based Handover For details
about how to activate, verify, and deactivate this feature, see
Configuring GSM/WCDMA Service Based Handover. 10.8 DepIoying
GSM/WCDMA Load Based Handover For details about how to activate,
verify, and deactivate this feature, see Configuring GSM/WCDMA Load
Based Handover. 10.9 DepIoying Fast WCDMA ReseIection at 2G CS CaII
ReIease For details about how to activate, verify, and deactivate
this feature, see Configuring the Fast WCDMA Reselection at 2G CS
Call Release. 10.10 ReIated Parameters in the System Information
GSM/WCDMA interoperability requires support from MSs. The radio
access capability reported by an MS contains the PS handover field,
which specifies whether the MS supports PS handover. After
GSM/WCDMA interoperability is enabled, the early classmark sending
function should be enabled so that MSs will report their support
capabilities as early as possible. The early classmark sending
function is enabled after ECSC is set to Yes. t is recommended that
the value of SendUtranECSCFlag andCLASSMARKQUERY be set to YES.
When setting inter-RAT cell reselection parameters and handover
thresholds, take note of the correlation between the GSM parameters
and WCDMA parameters to avoid ping-pong handovers. Telecom
operators can control the cell reselection between GSM and WCDMA by
setting parameters in the system information. For example, to allow
MSs to access aWCDMA cell when available, it is recommended that QI
be set to 7. n this manner, WCDMA cell search is always performed.
The value of FDDQOFF has a great impact on cell reselection. To
allow MSs to preferentially access a WCDMA cell, it is recommended
that the value of FDDQOFF be changed and the actual offset be set
to a negative value. When the value of FDDQOFF is smaller than 8,
the corresponding actual offset is smaller than 0. 10.11
Neighboring WCDMA CeII Configuration To enable GSM/WCDMA
interoperability, GSM cells must be configured with neighboring
WCDMA cells. Neighboring WCDMA cells can be configured at the BSS
by adding external WCDMA cells. To configure WCDMA cells at the
BSS, set UTRANCELLTYPE to FDD. One GSM cell can be configured with
a maximum of 64 neighboring WCDMAcells. Those cells can work in a
maximum of three frequencies. Each frequency accommodates a maximum
of 32 cells. 10.12 Iur-g Interface Between GSM and WCDMA A BSC can
be connected to a maximum of 16 RNCs over the ur-g interface.
nformation exchange is enabled when SPTINFOEXCHG is set to YES.
After information exchange is enabled, set INFOEXCHGLIST to
CELLCAPCLASS or NACCRELATED. 10.13 GSM/WCDMA Inter-RAT NC2 and
GSM/WCDMA Inter-RAT PS Handover GSM/WCDMA inter-RAT PS handover
requires support from the MS, RNC, BSC, and CN. NC2 is enabled when
NCO is set to NC2. PS handover is supported when PSHOSUP is set to
YES. After the PS handover is enabled: ! To enable the incoming GSM
inter-RAT PS handover, set SPTINTERRATINBSCPSHO to SUPPORT. ! To
enable the incoming WCDMA inter-RAT PS handover, set
SPTINTERRATOUTBSCPSHO to SUPPORT. ! f NCO is set to NC0 or NC1,
NACCSPT must be set to YES. ! f NCO is set to NC2, the BSC performs
the PS handover decision based on measurement reports from the MS
and indications from the SGSN. After NC2 and PS handover is
enabled: ! To enable quality-based NC2 cell reselection and
quality-based handover, set URGENTRESELALLOW to PERMIT. ! To enable
load-based NC2 cell reselection and load-based handover, set
LOADRESELALLOW to PERMIT. ! To enable coverage-based NC2 cell
reselection and coverage-based handover, set NORMALRESELALLOW to
PERMIT 10.14 Performance Optimization 10.14.1 GSM/WCDMA
InteroperabiIity and 2G/3G CeII ReseIection Based on MS State
Monitoring Monitor the number of allowed FDD calls to check whether
the GSM/WCDMA nteroperability and 2G/3G Cell Reselection Based on
MS State features need to be optimized. Parameter Optimization f
the number of allowed FDD calls is great, MSs are likely to camp on
GSM cells. n addition to optimizing WCDMA coverage, modify the
settings of S-related parameters toincrease the possibility of
GSM-to-WCDMA cell reselection. You are advised to set QI to 7 to
ensure that MSs always search for 3G cells. n addition, you are
advised to setFDDQMINOFFSET, FDDRSCPMIN, and FDDQMIN to small
values, and FDDQOFF to a large value. 10.14.2 GSM/WCDMA Service
Based Handover and GSM/WCDMA Load Based Handover Monitoring Monitor
the inter-RAT outgoing cell handover success rate and call drop
rate to check whether the GSM/WCDMA Service Based Handover and
GSM/WCDMA Load Based Handover features need to be optimized.
Parameter Optimization f the inter-RAT outgoing cell handover
success rate is low, set RSCPOFF to a small value for increasing
the number of candidate cells, and set HOSTAT3G to a large value
for reducing the number of handovers. f the call drop rate is high,
set ECNOOFF, HODURT3G, and TRIGTHRES to small values for
accelerating handover decisions. 10.14.3 Fast WCDMA ReseIection at
2G CS CaII ReIease N/A 10.15 TroubIeshooting None 11 Parameters
TabIe 11-1 Parameter description Parameter IDNEMML Command Feature
ID Feature NameDescription BET3GHOENBSC6900 SET
GCELLHOUTRANFDD(Optional) GBFD-114301 GBFD-114302
GSM/WCDMAnteroperability GSM/TD-SCDMA nteroperability Meaning: This
parameter specifies whether to allow 3G better cell handover
algorithm. GU Value Range: NO(No), YES(Yes) Actual Value Range: NO,
YES Default Value: NO Unit: None CELLRXQUALWORSENRATOTHRSH BSC6900
SET GCELLNC2PARA(Optional) GBFD-116201 GBFD-511303
Network-Controlled Cell Reselection (NC2) PS Handover Between
GSMand LTE Based on Quality Meaning: The number of times that the
downlink transmission quality of the MS is lower than the
transmission quality threshold of the MS ("EDGE GMSK Quality
Threshold", "EDGE 8PSK Quality Threshold", or "GPRS Quality
Threshold" by TBF type) is calculated accumulatively. When the rate
of the accumulated value to the number of received measurement
reports on the downlink transmission quality (Packet Downlink
Ack/Nack message) is greater than or equal to the value of this
parameter, the emergency reselection is triggered. GU Value Range:
0~100 Actual Value Range: 0~100 Default Value: 30 Unit: %
CELLSELECTAFTERCALLREL BSC6900 SET GCELLCCAD(Optional) GBFD-114325
GBFD-511406 Fast WCDMAReselection at 2G CS Call Release Meaning:
This parameter specifies whether to allow a mobile phone to
preferentially camp on a 3G cell after a call is terminated in the
areas covered by both Parameter IDNEMML Command Feature ID Feature
NameDescription the GSM network and the UMTS network. GU Value
Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value:
NO Unit: None CLASSMARKQUERY BSC6900 SET OTHSOFTPARA(Optional)
GBFD-110501 GBFD-114302 Call Control GSM/TD-SCDMA nteroperability
Meaning: Whether to enable the BSC to include the 3G classmark
information element in the Classmark Request message that the BSC
forwards from the MSC to an MS GU Value Range: NO(No), YES(Yes)
Actual Value Range: NO, YES Default Value: NO Unit: None
DlLdrThrd2GCell BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103
GSM andWCDMA Load Balancing Based on ur-g Meaning: When the
downlink load of a cell is larger than the value of this parameter
and is smaller than "2G Cell DL Overload Congest Thred", the
downlink of the cell is in the basic congestion status. GU Value
Range: 1~100 Actual Value Range: 1~100 Default Value: 90 Unit: None
DlOlcThrd2GCell BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103
GSM andWCDMA Load Balancing Based on ur-g Meaning: When the
downlink load of a cell is greater than the value, the downlink of
the cell is in the overload congestion status. GU Value Range:
1~100 Actual Value Range: 1~100 Default Value: 100 Unit: None
Parameter IDNEMML Command Feature ID Feature NameDescription
ECNOOFFBSC6900 ADD G3GNCELL(Optional) MOD G3GNCELL(Optional)
GBFD-114301 GSM/WCDMAnteroperability Meaning: As a performance
counter for 3G cells, Ec/No indicates the ratio of the energy per
received chip to the spectral noise power density. f the Ec/No of a
3G neighbor cell is greater than "HOECNOTH3G" plus this parameter,
the neighbor cell is listed in the candidate cell queue. GU Value
Range: 0~49 Actual Value Range: 0~49 Default Value: 3 Unit: dB
ECSCBSC6900 SET GCELLCCBASC(Optional) GBFD-111101 GBFD-114302
System nformation Sending GSM/TD-SCDMA nteroperability Meaning: The
early classmark sending control (ECSC) parameter specifies whether
the MSs in a cell use early classmark sending. After a successful
immediate assignment, the MS sends additional classmark information
to the network as early as possible. The additional classmark
information mainly contains the CM3 (classmark 3) information. The
CM3 (classmark 3) information contains the frequency band support
capability of the MS (used for the future channel assignment),
power information about each frequency band supported by the MS
(used for the handover between different frequency bands), and
encryption capability of the MS. GU Value Range: NO(No), YES(Yes)
Actual Value Range: NO, YES Parameter IDNEMML Command Feature ID
Feature NameDescription Default Value: YES Unit: None
FDDCELLOFFBSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301
GSM/WCDMAnteroperability Meaning: Offset of a FDD cell report. When
the priority of a 3G cell is sequenced, the value of this parameter
be added to the receive level of the 3G cell in the measurement
report. The values of this parameter correspond to the following
decibel values: 0: 0 dB 1: 6 dB ... 7: 42 dB GU Value Range: 0~7
Actual Value Range: 0~42 Default Value: 0 Unit: 6dB FDDCELLTHRED
BSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301
GSM/WCDMAnteroperability Meaning: Threshold of a FDD cell report.
When the receive level value in the measurement report of a 3G cell
exceeds the value of this parameter, the measurement report takes
effect. After the valid measurement report is filtered, the 3G cell
joins the cell priority sequence. The values of this parameter
correspond to the following decibel values: 0: 0 dB 1: 6 dB ... 6:
36 dB 7: positive infinity GU Value Range: 0~7 Parameter IDNEMML
Command Feature ID Feature NameDescription Actual Value Range:
0~36, Positive infinity Default Value: 0 Unit: 6dB FDDFREQCNUM
BSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301
GSM/WCDMAnteroperability Meaning: Number of UTRAN FDD cells that
should be included in measurement report GU Value Range: 0~3 Actual
Value Range: 0~3 Default Value: 2 Unit: None FDDQMNBSC6900 SET
GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability
Meaning: This parameter specifies one of the parameters for FDD
cell reselection. A FDD cell becomes a candidate cell if all the
following conditions are met for five consecutive seconds:
1.Receive level of the FDD cell > Average receive level of the
current serving cell + "FDD Q offset"; The FDD cell meets the
following condition in the case of any neighboring 2G cell:Receive
level of the FDD cell > Receive level of any neighboring 2G cell
+ "FDD Q offset"; 2. Ec/No of the FDD cell > "FDD Qmin" - "FDD
Qmin Offset"; 3. Receive level of the FDD cell >"RSCP
Threshold"; f multiple FDD cells meet the preceding conditions, the
MS reselects the cell with the strongest receive level. See 3GPP
TSs 45.008 and 25.304. The values of this parameter Parameter
IDNEMML Command Feature ID Feature NameDescription correspond to
the following decibel values: 0: -20 dB, 1: -6 dB, 2: -18 dB, 3: -8
dB, 4: -16 dB, 5: -10 dB, 6: -14 dB, 7: -12 dB. GU Value Range: 0~7
Actual Value Range: -20, -6, -18, -8, -16, -10, -14, -12 Default
Value: 0 Unit: dB FDDQMNOFFSET BSC6900 SET
GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability
Meaning: Offset of the minimum threshold for Ec/No during a FDD
cell reselection. A FDD cell becomes a candidate cell if all the
following conditions are met for five consecutive seconds:
1.Receive level of the FDD cell > Average receive level of the
current serving cell + "FDD Q offset"; The FDD cell meets the
following condition in the case of any neighboring 2G cell:Receive
level of the FDD cell > Receive level of any neighboring 2G cell
+ "FDD Q offset"; 2. Ec/No of the FDD cell > "FDD Qmin" - "FDD
Qmin Offset"; 3. Receive level of the FDD cell >"RSCP
Threshold"; f multiple FDD cells meet the preceding conditions, the
MS reselects the cell with the strongest receive level. Parameter
IDNEMML Command Feature ID Feature NameDescription See 3GPP TSs
45.008 and 25.304. GU Value Range: 0~7 Actual Value Range: 0~7
Default Value: 0 Unit: dB FDDQOFFBSC6900 SET
GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability
Meaning: This parameter specifies one of the thresholds of the
signal level for 3G cell reselection. A FDD cell becomes a
candidate cell if all the following conditions are met for five
consecutive seconds: 1.Receive level of the FDD cell > Average
receive level of the current serving cell + "FDD Q offset"; The FDD
cell meets the following condition in the case of any neighboring
2G cell:Receive level of the FDD cell > Receive level of any
neighboring 2G cell + "FDD Q offset"; 2. Ec/No of the FDD cell >
"FDD Qmin" - "FDD Qmin Offset"; 3. Receive level of the FDD cell
>"RSCP Threshold"; f multiple FDD cells meet the preceding
conditions, the MS reselects the cell with the strongest receive
level. See 3GPP TSs 45.008 and 25.304. The values of this parameter
correspond to the following decibel values: 0: - (always select a
cell if acceptable) 1: -28 dB, 2: -24 dB, Parameter IDNEMML Command
Feature ID Feature NameDescription ... 15: 28 dB. GU Value Range:
0~15 Actual Value Range: Negative infinity, -28~28 Default Value: 8
Unit: 4dB FDDREPBSC6900 SET GCELLCCUTRANSYS(Optional) GBFD-114301
GBFD-110801 GBFD-110802 GSM/WCDMAnteroperability Processing of
Measurement Report Pre-processing of Measurement Report Meaning:
This parameter specifies whether Ec/No or RSCP is used for the
measurement report on a FDD cell. Ec/No stands for the
signal-to-noise ratio. RSCP stands for the received signal code
power. GU Value Range: RSCP(RSCP), EcN0(Ec/N0) Actual Value Range:
RSCP, EcN0 Default Value: RSCP Unit: None FDDRSCPMNBSC6900 SET
GCELLCCUTRANSYS(Optional) GBFD-114301 GSM/WCDMAnteroperability
Meaning: Minimum level threshold of UTRAN cell reselection. During
the cell reselection decision from a GSM cell to a FDD cell, this
parameter is used to calculate the RSCP threshold of the target
cell. A FDD cell becomes a candidate cell if all the following
conditions are met for five consecutive seconds: 1.Receive level of
the FDD cell > Average receive level of the current serving cell
+ "FDD Q offset"; The FDD cell meets the following condition in the
case of any neighboring 2G cell:Receive level of the FDD cell
Parameter IDNEMML Command Feature ID Feature NameDescription >
Receive level of any neighboring 2G cell + "FDD Q offset"; 2. Ec/No
of the FDD cell > "FDD Qmin" - "FDD Qmin Offset"; 3. Receive
level of the FDD cell >"RSCP Threshold"; f multiple FDD cells
meet the preceding conditions, the MS reselects the cell with the
strongest receive level. See 3GPP TSs 45.008 and 25.304. The values
of this parameter correspond to the following decibel values: 0 =
-114 dBm, 1 = -112 dBm, 2 = -110 dBm, ... 14 = -86 dBm, 15 = -84
dBm. GU Value Range: 0~15 Actual Value Range: -114~-84 Default
Value: 6 Unit: 2dBm FDDRSCPQUALTHRSH BSC6900 ADD
GEXT3GCELL(Optional) MOD GEXT3GCELL(Optional) GBFD-114301
GSM/WCDMAnteroperability Meaning: Minimum RSCP of the 3G FDD cell
candidate GU Value Range: 0~63 Actual Value Range: 0~63 Default
Value: 10 Unit: None G2G3GLdBlcDeltaThrd BSC6900 SET
OTHSOFTPARA(Optional) GBFD-511103 GBFD-511408 GSM andWCDMA Load
Balancing Based on ur-g Meaning: Use this parameter to set Load
difference threshold for load-based handovers between GSMand UMTS.
f the load balance between a Parameter IDNEMML Command Feature ID
Feature NameDescription 2G cell and a 3G cell is greater than the
threshold, load balance istriggered. GU Value Range: 0~200 Actual
Value Range: -100~100 Default Value: 110 Unit: % G2GLoadAdjustCoeff
BSC6900 SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA
Load Balancing Based on ur-g Meaning: Coefficient used to modulate
the load level of a 2G system so that the load level of the 2G
system can be compared with that of a 3G system. GU Value Range:
0~100 Actual Value Range: 0~100 Default Value: 10 Unit: None
HODURT3GBSC6900 ADD G3GNCELL(Optional) MOD G3GNCELL(Optional)
GBFD-110601 GBFD-510501 HUAWE Handover HUAWE Handover Meaning:
According to the P/N rule, if the conditions for the handover to a
better 3G cell are met for P seconds within N seconds, the handover
is triggered. This parameter specifies the number P. GU Value
Range: 1~32 Actual Value Range: 0.5~16 Default Value: 8 Unit: 0.5s
HOECNOTH3GBSC6900 SET GCELLHOUTRANFDD(Optional) GBFD-114301
GSM/WCDMAnteroperability Meaning: The 3G better cell handover can
betriggered only when the Ec/No of a neighboring 3G cell is greater
than this threshold for a period of time. GU Value Range: 0~49
Actual Value Range: 0~49 Default Value: 35 Unit: dB Parameter
IDNEMML Command Feature ID Feature NameDescription HOOPTSELBSC6900
SET GCELLHOUTRANFDD(Optional) GBFD-110601 GBFD-510501 GBFD-114301
GBFD-114302 HUAWE Handover HUAWE Handover GSM/WCDMAnteroperability
GSM/TD-SCDMA nteroperability Meaning: This parameter specifies
whether a 2G cell or to a 3G cell is preferentially selected as the
target cell for handover. When this parameter is setto Pre_2G_Cell,
the BSC preferentially selects a 2G candidate cell as the target
cell for handover. When this parameter is set to Pre_3G_Cell, the
BSC preferentially selects a 3G candidate cell as the target cell
for handover. When this parameter is set to Pre_2G_CellThres, the
BSC preferentially selects a neighboring 3G cell as the handover
target cell if the receive level of the neighboring 2G cell that
ranks the first in the candidate cell list is equal to or smaller
than "HO Preference Threshold for 2G Cell". Otherwise, the BSC
preferentially selects a neighboring 2G cell as the handover target
cell. GU Value Range: Pre_2G_Cell(Preference for 2G cell),
Pre_3G_Cell(Preference for 3G cell), Pre_2G_CellThres(Preference 2G
cell by thresh) Actual Value Range: Pre_2G_Cell, Pre_3G_Cell,
Pre_2G_CellThres Default Value: Pre_2G_CellThres Unit: None
HOPRETH2GBSC6900 SET GCELLHOUTRANFDD(Optional) GBFD-110601
GBFD-510501 HUAWE Handover HUAWE Handover GSM/WCDMAnteroperability
Meaning: f the receive level of the neighboring 2G cell that ranks
the first in the candidate cell list is equal to or smaller than
this Parameter IDNEMML Command Feature ID Feature NameDescription
GBFD-114301 GBFD-114302 GSM/TD-SCDMA nteroperability threshold, the
BSC preferentially selects a neighboring 3G cell as the handover
target cell. Otherwise, the BSC preferentially selectsa neighboring
2G cell as the handover target cell. GU Value Range: 0~63 Actual
Value Range: 0~63 Default Value: 25 Unit: dB HORSCPTH3GBSC6900 SET
GCELLHOUTRANFDD(Optional) GBFD-114301 GBFD-114302
GSM/WCDMAnteroperability GSM/TD-SCDMA nteroperability Meaning: The
3G better cell handover is triggeredonly when the RSCP of a
neighboring 3G cell is greater than this threshold for a period of
time. GU Value Range: 0~63 Actual Value Range: 0~63 Default Value:
50 Unit: dB HOSTAT3GBSC6900 ADD G3GNCELL(Optional) MOD
G3GNCELL(Optional) GBFD-110601 GBFD-510501 HUAWE Handover HUAWE
Handover Meaning: According to the P/N rule, if the conditions for
the handover to a better 3G cell are met in P of N measurement
reports, the handover istriggered. This parameter specifies the
number N. GU Value Range: 1~32 Actual Value Range: 0.5~16 Default
Value: 10 Unit: 0.5s NFOEXCHGLST BSC6900 ADD GNRNC(Mandatory) MOD
GNRNC(Mandatory) MRFD-211402 GBFD-511102 GBFD-511402 MBSC Load
Balancing NACC Procedure Optimization Based on ur-g between GSMand
WCDMA Radio Resource Reserved Handover BetweenGSM/TD-SCDMA Based on
ur-g Meaning: nformation exchange content to be supported GU Value
Range: CELLCAPCLASS(Cell Capacity nfo), NACCRELATED(NACC nfo)
Actual Value Range: Parameter IDNEMML Command Feature ID Feature
NameDescription CELLCAPCLASS, NACCRELATED Default Value:
CELLCAPCLASS Unit: None NTERRATCELLRESELEN BSC6900 SET
GCELLHOBASC(Optional) GBFD-511104 GBFD-114302 GSM andWCDMATraffic
Steering Based on ur-g GSM/TD-SCDMA nteroperability Meaning: This
parameter specifies whether the reselection from 2G cells to 3G
cells is allowed. GU Value Range: NO(No), YES(Yes) Actual Value
Range: NO, YES Default Value: NO Unit: None NTERRATNBSCHOEN BSC6900
SET GCELLHOBASC(Optional) GBFD-114301 GBFD-114302 GBFD-511103
GBFD-511402 GSM/WCDMAnteroperability GSM/TD-SCDMA nteroperability
GSM andWCDMA Load Balancing Based on ur-g Radio Resource Reserved
Handover BetweenGSM/TD-SCDMA Based on ur-g Meaning: This parameter
specifies whether the handover from 3G cells to 2G cells is
allowed. When this parameter is set to NO, the parameter is invalid
if the source cell identifier contained in a 3G-to-2G cell handover
request is CG (not SA). GU Value Range: NO(No), YES(Yes) Actual
Value Range: NO, YES Default Value: NO Unit: None NTERRATOUTBSCHOEN
BSC6900 SET GCELLHOBASC(Optional) GBFD-114301 GBFD-114302
GBFD-511103 GSM/WCDMAnteroperability GSM/TD-SCDMA nteroperability
GSM andWCDMA Load Balancing Based on ur-g Meaning: This parameter
specifies whether the handover from 2G cells to 3G cells is
allowed. GU Value Range: NO(No), YES(Yes) Actual Value Range: NO,
YES Default Value: NO Unit: None Parameter IDNEMML Command Feature
ID Feature NameDescription ntRATLoadHOEcNoThr BSC6900 SET
GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing
Based on ur-g Meaning: Minimum Ec/No value of a 3G cell during the
load-based GSM-to-UMTS handover GU Value Range: 0~49 Actual Value
Range: 0~49 Default Value: 25 Unit: dB ntRATLoadHORSCPThr BSC6900
SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load
Balancing Based on ur-g Meaning: Minimum RSCP value of a 3G cell
during the load-based GSM-to-UMTS handover GU Value Range: 0~91
Actual Value Range: 0~91 Default Value: 30 Unit: dB
nterRATLoadHoEcNoBandWidth BSC6900 SET GCELLHONTERRATLDB(Optional)
GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning:
Width of load band [EcNo] during the inter-RAT hierarchical
load-based handover GU Value Range: 1~49 Actual Value Range: 1~49
Default Value: 20 Unit: dB nterRATLoadHoEcNoStart BSC6900 SET
GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing
Based on ur-g Meaning: nitial EcNo value of the inter-RAT
load-based handover band GU Value Range: 0~49 Actual Value Range:
0~49 Default Value: 49 Unit: dB nterRATLoadHoRSCPBandWidth BSC6900
SET GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load
Balancing Based on ur-g Meaning: Width of load band [RSCP] during
the inter-RAT hierarchical load-based handover GU Value Range: 1~91
Actual Value Range: 1~91 Default Value: 60 Unit: dB Parameter
IDNEMML Command Feature ID Feature NameDescription
nterRATLoadHoRSCPStart BSC6900 SET GCELLHONTERRATLDB(Optional)
GBFD-511103 GSM andWCDMA Load Balancing Based on ur-g Meaning:
nitial RSCP value of the inter-RAT load-based handover band GU
Value Range: 0~91 Actual Value Range: 0~91 Default Value: 91 Unit:
dB nterRatCsServiceLoadHoThrd BSC6900 SET
GCELLHONTERRATLDB(Optional) GBFD-511103 GSM andWCDMA Load Balancing
Based on ur-g Meaning: Threshold for setting the flag of accepting
inter-RAT CS service handover of a 2G cell GU Value Range: 1~100
Actual Value Range: 1~100 Default Value: 80 Unit: None
nterRatServiceLoadHoSwitch BSC6900 SET GCELLHONTERRATLDB(Optional)
GBFD-511103 GBFD-511407 GBFD-511408 GBFD-511104 GSM andWCDMA Load
Balancing Based on ur-g GSM andWCDMATraffic Steering Based on ur-g
Meaning: When this parameter is set to Service-based, the inter-RAT
handover is triggered on the basis of the service distribution. n
this case, the target cell is selected this parameter is set to
Load-based, the inter-RAT handover is triggered on the basis of the
load balance. n this case, the target cell is selected according to
the traffic load on the target cell and the load difference between
2G and 3G cells. When this parameter is set to Dynamic Service/Load
based, the target cell is dynamically selected by using the
service-based algorithm or the load-based algorithm according to
the traffic load on the cell. When this parameter is set to CN
Service-based, the inter-RAT handover decision is made on the basis
of the service attribute of the core Parameter IDNEMML Command
Feature ID Feature NameDescription network. When this parameter is
set to OFF, no inter-RAT service handover or inter-RAT load
handover in the access state is performed. GU Value Range:
Service-based(Service-based), Load-based(Load-based),
Dynamic-based(Dynamic Service/Load-based), CnService-based(CN
Service-based), OFF(OFF) Actual Value Range: Service-based,
Load-based, Dynamic-based, CnService-based, OFF Default Value: OFF
Unit: None LOADRESELALLOW BSC6900 SET GCELLNC2PARA(Optional)
GBFD-116201 GBFD-511304 GBFD-511307 Network-Controlled Cell
Reselection (NC2) PS Handover Between GSMand LTE Based on Cell Load
eNC2 BetweenGSM and LTE Meaning: Whether to allow the cell load
reselection. f this parameter is set to PERMT and "NC2 Load
Reselection Switch" is set to Support, the load of the target cell
is involved in the algorithm for NC2 cell reselection. GU Value
Range: FORBD(Forbid), PERMT(Permit) Actual Value Range: FORBD,
PERMT Default Value: PERMT Unit: None LOADRESELMAXRXLEV BSC6900 SET
GCELLNC2PARA(Optional) GBFD-116201 GBFD-511304 Network-Controlled
Cell Reselection (NC2) PS Handover Between GSMand LTE Based on Cell
Load Meaning: Threshold for allowing the MS to reselect a cell
during load reelection. When the receive level of the serving cell
is lower than this threshold, the load reselection is triggered. GU
Value Range: 0~63 Parameter IDNEMML Command Feature ID Feature
NameDescription Actual Value Range: 0~63 Default Value: 40 Unit:
None LOADRESELRXTHRSH BSC6900 SET GCELLNC2PARA(Optional)
GBFD-116201 GBFD-114301 GBFD-114322 GBFD-511304 GBFD-511310
Network-Controlled Cell Reselection (NC2) GSM/WCDMAnteroperability
GSM/WCDMALoad Based Handover PS Handover Between GSMand LTE Based
on Cell Load Multi Technology Neighbour Cell Based Handover
Meaning: When the uplink load or downlink load of the target cell
is lower than this threshold, it can accept the MSs from the
serving cell due to load reselection. GU Value Range: 0~100 Actual
Value Range: 0~100 Default Value: 60 Unit: % LOADRESELSTARTTHRSH
BSC6900 SET GCELLNC2PARA(Optional) GBFD-116201 GBFD-511304
Network-Controlled Cell Reselection (NC2) PS Handover Between
GSMand LTE Based on Cell Load Meaning: When the uplink load or
downlink load of the cell exceeds this threshold, the load
reselection decision is made. GU Value Range: 0~100 Actual Value
Range: 0~100 Default Value: 85 Unit: % MNACCRXLEVBSC6900 SET
GCELLNC2PARA(Optional) GBFD-116201 GBFD-511302 GBFD-511303
GBFD-511304 GBFD-511306 Network-Controlled Cell Reselection (NC2)
PS Handover Between GSMand LTE Based on Coverage PS Handover
Between GSMand LTE Based on Quality PS Handover Between GSMand LTE
Based on Cell Load GSM/LTE Service Based PS Handover Meaning:
Minimum receive level for a neighbor cellto become a candidate cell
during cell reselection. When the receive level of the serving cell
is lower than the value of this parameter, it indicates that the
normal cell reselection level is bad. n this case, the parameter
value is used for the calculation of the times of the occurrence of
bad normal cell reselection level. GU Value Range: 0~63 Actual
Value Range: 0~63 Default Value: 15 Unit: None Parameter IDNEMML
Command Feature ID Feature NameDescription NACCSPTBSC6900 SET
GCELLGPRS(Optional) GBFD-116301 GBFD-119502 Network Assisted Cell
Change (NACC) PS Handover Meaning: Whether to support Network
Assisted Cell Change (NACC). NACC is used in the network control
mode NC0, NC1 or NC2. When an MS is in packet transfer mode, the
NACC enables the network to notify the MS in advance of the system
information about neighboring cells, accelerating cell reselection
for MSs. GU Value Range: NO(No), YES(Yes) Actual Value Range: NO,
YES Default Value: NO Unit: None NC2LoadReselBSC6900 SET
BSCPSSOFTPARA(Optional) GBFD-116201 Network-Controlled Cell
Reselection (NC2) Meaning: Whether to involve the load of the
target cell in the algorithm for NC2 cell reselection. f this
parameter is set to Support, the load of the target cell is
involved in the algorithm for NC2 cell reselection. GU Value Range:
NotSupport(Not Support), Support(Support) Actual Value Range:
NOTSUPPORT, SUPPORT Default Value: NOTSUPPORT Unit: None
NC2SPTBSC