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Document
CodeProduct
NameWCDMA Node B&RNC
IntendedAudience
Internal ProductVersion
Prepared
by
UMTS Maintenance
Development Dept
Document
Version
HSPA+ Deployment Guide
Prepared
by
HSPA team, UMTS
MaintenanceDepartment
Date 2009-07-24
Reviewed
byDate 2009-07-24
Reviewed
byDate 2009-07-24
Approved
byDate 2009-07-24
Huawei Technologies Co., Ltd.
All rights reserved
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Table of Contents
HSPA+ Deployment Guide .................................................................................................. 1
Chapter 1 Overview ............................................................................................................. 9
1.1 Overview of HSPA+................................................................................................ 9
1.2 Availability ............................................................................................................. 11
1.2.1 Involved Network Elements ....................................................................... 11
1.2.2 Version Support ......................................................................................... 12
1.3 Principles .............................................................................................................. 13
1.3.1 HSPA+ Code Allocation Policy .................................................................. 13
1.3.2 Flow Control ............................................................................................... 13
1.3.3 Scheduling.................................................................................................. 14
1.3.4 Power Control on HSPA+ Channels .......................................................... 15
1.3.5 HSPA+ RRM Policy ................................................................................... 15
Chapter 2 Introduction to Basic Principles ........................................................................ 16
2.1 Overview of Basic HSPA+ Principles ................................................................... 16
2.2 Key Technologies of HSPA+ ................................................................................ 16
2.2.1 Adaptive Modulation and Coding ............................................................... 16
2.2.2 HARQ ......................................................................................................... 16
2.2.3 Schedule .................................................................................................... 17
2.2.4 Layer 2 Enhancement ................................................................................ 17
2.2.5 64QAM High-Order Modulation ................................................................. 17
2.2.6 2x2MIMO .................................................................................................... 18
2.3 Structure of HSPA+ Channels.............................................................................. 18
2.3.1 HS-DSCH ................................................................................................... 18
2.3.2 HS-SCCH ................................................................................................... 19
2.3.3 HS-DPCCH ................................................................................................ 19
2.4 Data Transmission on Physical Layer of HSPA+ ................................................. 20
2.5 MAC-ehs Entity..................................................................................................... 21
2.6 HSPA+ Signaling Plane and User Plane ............................................................. 22
2.6.1 HSPA+ Signaling Plane ............................................................................. 22
2.6.2 Data Transmission on HSPA User Plane .................................................. 23
2.7 Mobility Management ........................................................................................... 24
2.7.1 HSPA+ Intra-Frequency Handover Policy ................................................. 24
2.7.2 HSPA+ Inter-Frequency Handover Policy ................................................. 25
2.7.3 HSPA+ Inter-System Handover Policy ...................................................... 25
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Chapter 3 Upgrade Guide.................................................................................................. 25
3.1 RNC Upgrade ....................................................................................................... 25
3.1.1 Upgrade Requirement ................................................................................ 25
3.2 NodeB Upgrade .................................................................................................... 26
Chapter 4 Data Configuration Policy ................................................................................. 27
4.1 HSPA+ Network Establishment............................................................................ 27
4.1.1 GGSN Configuration (Huawei)................................................................... 27
4.1.2 SGSN Configuration (Huawei) ................................................................... 27
4.1.3 Registration Rate Configuration ................................................................. 27
4.2 Check on Transmission Configuration on Iub or Iu Interface .............................. 28
4.2.1 Check on Transmission Configuration on Iub Interface ............................ 28
4.2.2 Check on Bandwidth of Iu-PS Interface ..................................................... 28
4.2.3 Node B Configuration ................................................................................. 28
4.2.4 RNC Configuration ..................................................................................... 29
4.3 Service and Bearer Configuration ........................................................................ 30
4.3.1 HSPA+ Configuration During Registration ................................................. 30
4.3.2 Code Allocation of HSPA+-Enabled Cell ................................................... 30
4.3.3 Power Configuration of HSPA+-Enabled Cell............................................ 31
4.3.4 HSPA+ Scheduling and Flow Control Configuration ................................. 31
4.3.5 HSPA+ Power Control Configuration ......................................................... 31
4.3.6 QoS Guarantee Configuration of HSPA+ .................................................. 31
4.3.7 License Configuration for HSPA+ .............................................................. 32
4.4 Radio Resource Management Configuration ....................................................... 32
4.4.1 HSPA+ Measurement Control Configuration ............................................. 32
4.4.2 HSPA+ Admission Control Configuration .................................................. 32
4.4.3 HSPA+ DRD Configuration ........................................................................ 33
4.4.4 HSPA+ Load Control Configuration ........................................................... 33
4.5 Typical HSPA+ Configuration in Competition Scenarios ..................................... 33
Chapter 5 Networking Policy ............................................................................................. 35
5.1 Overview ............................................................................................................... 35
5.2 HSPA+ 64QAM Dual-Carrier Service Allocation Policy ....................................... 36
5.2.1 HSPA+ 64QAM Networking Mode I ........................................................... 36
5.2.2 HSPA+ 64QAM Networking Mode II .......................................................... 36
5.2.3 Comparison of Two HSPA+ 64QAM Networking Modes .......................... 37
5.3 Introduction to MIMO Networking Policy .............................................................. 38
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5.3.1 MIMO Networking Mode I .......................................................................... 38
5.3.2 MIMO Networking Mode II ......................................................................... 39
5.3.3 MIMO Networking Mode III ........................................................................ 40
Chapter 6 FAQs ................................................................................................................. 41
6.1 Services Failing to Access HSPA Channels ........................................................ 41
6.2 Low Download Rate of HSPA Service ................................................................. 41
6.3 Rate of High-rate HSPA+ Service (21 Mbit/s) Being Low .................................... 41
Chapter 7 Appendix ........................................................................................................... 43
7.1 RNC-Related MML Commands ........................................................................... 43
7.2 Node B-Related MML Commands ....................................................................... 45
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List of Tables
Table 1 Acronyms and Abbreviations .......................................................................... 8
Table 2 Hardware requirement................................................................................... 11
Table 3 Categories of HSPA+-enabled UEs (red) ..................................................... 11
Table 4 Version support table .................................................................................... 13
Table 5 Recommended RNC version ........................................................................ 25
Table 6 Recommended NodeB version ..................................................................... 26
Table 7 Comparison of two networking modes .......................................................... 37
Table 8 RNC-related MML commands....................................................................... 45
Table 9 Node B-related MML commands .................................................................. 45
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List of Figures
Figure 1 Code multiplexing combination .................................................................... 17
Figure 2 Structure of an HS PDSCH frame ............................................................... 19
Figure 3 Structure of an HS-SCCH frame .................................................................. 19
Figure 4 Structure of a non-MIMO HS-DPCCH frame ............................................... 20
Figure 5 Structure of a MIMO HS-DPCCH frame ...................................................... 20
Figure 6 MAC-ehs entity ............................................................................................. 21
Figure 7 Resource audit procedure ............................................................................ 22
Figure 8 Resource status indication ........................................................................... 22
Figure 9 Type 2 HS-DSCH data frame ...................................................................... 23
Figure 10 Capacity request frame .............................................................................. 24
Figure 11 Capacity allocation frame ........................................................................... 24
Figure 12 Dual-carrier networking I ............................................................................ 36
Figure 13 Dual-carrier networking II ........................................................................... 37
Figure 14 MIMO networking mode I ........................................................................... 39
Figure 15 MIMO networking mode II .......................................................................... 39
Figure 16 MIMO networking mode III ......................................................................... 40
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HSPA+ Deployment Guide
Key words
HSPA+, HARQ, MAC-HS scheduling
Abstract
This document describes the deployment preparation, basic principles, upgrade
precautions, data configuration policies, network policies, and FAQs relating to the
HSPA+ deployment and works as a guide for field deployment.
This document is used for reference only, but not as basis of any reply to customers or
public.
Acronyms and Abbreviations
Acronyms and Abbreviations
Full Spelling
16QAM 16 Quadrature Amplitude Modulation
64QAM 64 Quadrature Amplitude Modulation
ACK Acknowledgement
AG Absolute Grant
BE Best Effect
CN Core Network
DCCH Dedicated Control Channel
DCH Dedicated Channel
DPCH Dedicated Physical Channel
DTCH Dedicated Traffic Channel
FP Frame Protocol
HARQ Hybrid Automatic Repeat Request
HSPA High Speed Downlink Packet Access
HSUPA High Speed Uplink Packet Access
IR Increment Redundancy
MAC-d Medium Access Control - dedicated
MIMO Multiple Input Multiple Output NACK Negative Acknowledgement
NE Network Element
PDU Protocol Data Unit
QoS Quality of Service
RG Relative Grant
RLC Radio Link Control
RLS Radio Link Set
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RNC Radio Network Controller
RoT Raise of Thermal
RSN Retransmission Sequence Number
RV Redundancy Version
RTT Round Trip TimeSF Spreading Factor
SG Serving Grant
SRNC Serving RNC
TNL Transport Network Layer
TSN Transmission Sequence Number
TTI Transmission Time Interval
UE User Equipment
UTRAN UMTS Radio Access Network
WCDMA Wideband Code Division Multiple Access
Table 1 Acronyms and Abbreviations
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Chapter 1 Overview
1.1 Overview of HSPA+
HSPA+ is introduced in the 3GPP Release 7. It is an enhancement to HSDPA introduced in the
WCDMA protocol of R6. The use of the HSPA+ technology helps provide higher data rate on
downlink radio links and improve the throughput of a single user and cell capacity. Therefore, the
HSPA+ further improves the service experience of end users.
As the most important feature of RAN11.0, the HSPA+ benefits mobile operators and end users in
the following aspects:
64QAM: DL 64QAM allows the use of 64QAM in HSDPA to increase the number of bits per
symbol and thus to obtain higher transmission rates. The peak rate at the MAC layer can reach 21
Mbit/s. .
2x2MIMO: MIMO increases transmission rates through space multiplexing and improves channel
qualities through space diversity. The network side can dynamically select single- or dual-stream
transmission according to channel conditions. The peak rate at the MAC layer can reach 28
Mbit/s. .
DL Enhanced Layer 2: This feature allows Uu L2 to use flexible PDU size on RLC layer and
segmentation on MAC layer. The feature prevents the L2 from becoming the bottleneck of higher
Uu rate increased by MIMO and 64QAM..
CPC: CPC allows the uplink and downlink transmissions to take place at periodic intervals. Thisfeature reduces the transmitted power (and thus increases the UE battery life) because the UE does
not have to monitor and transmit overhead channels every TTl. This reduction in the transmitted
power also helps to increase the uplink capacity by decreasing the total interference. This
improvement is especially significant when there are users who transmit data infrequently as VoIP
users.
CPC feature consists of DL-DRX, UL DTX and HS-SCCH Less Operation.
.
Enhanced CELL_FACH: Enhanced CELL_FACH operation allows the use of HSDPA
technologies for the UEs in the CELL_FACH, CELL_PCH, and URA_PCH state. The purpose is
to increase the peak rates in these states and reduce the signaling transmission delay during service
setup or state transition with the result improving the user experience.
.
The 64QAM and MIMO are the most important and commercialized features of the HSPA+
technology. This document only involves the 64QAM, MIMO, and Enhanced Layer 2 (basis of the
two important features). Enhanced CELL_FACH and CPC are not described here.
In a cellular network, the uplink traffic and downlink traffic are unbalanced. Generally, the
downlink capability is 2–5 times the uplink capability. Therefore, the downlink capability in the
WCDMA system is limited. For the downlink coverage, the downlink transmit power of the BTS
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is far greater than the uplink transmit power of the UE. Typically, the downlink transmit power of
the BTS is 43 dBm, and the uplink transmit power of the UE is 21–24 dBm. Therefore, uplink
UEs are easy to obtain higher SNR. In the case of high SNR, the higher-order modulation
technology can be used to obtain the higher spectral efficiency. Therefore, the 64 QAM high-order
modulation technology is introduced in R7 (the 16 QAM modulation is applied in R6).From the aspects of mobile operators and terminal users, the HSPA+ has the following
advantages:
Expand the downlink capacity of the network and obtain higher spectral efficiency in
the case of higher SNR.
The HSPA+ 64QAM provides a higher data transmission rate than the HSDPA. Theoretically, if
the 64QAM technology is adopted, the peak rate is 21.096 Mbit/s (Formula: TB_Size/TTI =
42192 / 2ms = 21.096 Mbit/s).
Using the space diversity method, the MIMO technology adopts the multi-antenna technology on
the transmitting side and receiving side to improve the transmission capacity of the radio
communication system by several times without increasing transmit power and bandwidth in the
high SNR environment (the transmission capacity is in proportion to the number of antennas).
Theoretically, if the HSPA+ MIMO technology is adopted, the peak rate is 27.952 Mbit/s
(Formula: TB_Size/TTI = 27952 / 2ms x 2 (double data stream) = 27.952 Mbit/s).
For operators, the use of the HSPA+ can reduce the unit cost for transmitting every mega bytes of
data stream, increase average system capability, enhance downlink data service performance of a
UE, and improves the cell throughput.
Improve service performance of end users.
The HSPA+ offers a higher data transmission rate, short service response time, and reliable service
performance for a UE. Therefore, it improves the service experience of the UE.
Upgrade on the existing WCDMA network.
Mobile operators concern about the expenses for building an HSPA+ network. This depends on
the equipment price and the service strategies of a single operator. As a high-rate data service
enhancement technology in the WCDMA R5, the HSPA+ is compatible with the HSPA of earlier
versions and R99. The operator can upgrade NodeBs in the existing WCDMA R99 network to
introduce the HSPA+ with little impact on the existing architecture. This helps shorten the network
construction period and protect the investments of the operator.
Constraint: This document describes the 64QAM, 2x2MIMO, and Enhanced Layer 2 of the R7
HSPA+, excluding the E_FACH and CPC technologies.
HSDPA: The HSDPA involved in this document refers to the R5/R6 HSDPA technology,
excluding the 64QAM and MIMO technologies in R7.
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1.2 Availability
1.2.1 Involved Network Elements
Network elements (NE) such as the UE, NodeB, RNC, and CN are involved to implement the
HSPA+ feature. The following table shows the data configuration requirement of these NEs. The
symbol √ indicates the corresponding NE is required.
Table 2 Hardware requirement
Requirement ofIP Feature
UE NodeB RNC HLR CN
Dataconfigurationrequirement
√ √ √ Supporting theregistrationspeed of theHSPA+
Supportingthe R7protocol
Hardwarerequirement
√ √ √ No specialrequirement
No specialrequirement
1. UE
In R7, six categories of UEs (Category 13–Category 18) are increased to support the HSPA+;
category 13 and category 14 support only the 64QAM; category 15 and category 16 support only
the MIMO; category 17 and category 18 support the 64QAM and MIMO, but cannot use the two
technologies at the same time. The details are marked in red.
Table 3 Categories of HSPA+-enabled UEs (red)
HS-DSCH
category
Maximum
number of
HS-DSCH
codes
received
Minimum
inter-TTI
interval
Maximum number of
bits of an HS-DSCH
transport block
received within
an HS-DSCH TTI
NOTE 1
Max bit
rate(Mbps)
Supported
modulations
without MIMO
operation
Supported
modulations
simultaneous
with MIMO
operation
Category 1 5 3 7298 1.2
QPSK, 16QAMNot applicable
(MIMO not
supported)
Category 2 5 3 7298 1.2
Category 3 5 2 7298 1.8
Category 4 5 2 7298 1.8
Category 5 5 1 7298 3.6
Category 6 5 1 7298 3.6
Category 7 10 1 14411 7.2
Category 8 10 1 14411 7.2
Category 9 15 1 20251 10.2
Category 10 15 1 27952 14.4
Category 11 5 2 3630 0.9 QPSK
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HS-DSCH
category
Maximum
number of
HS-DSCH
codes
received
Minimum
inter-TTI
interval
Maximum number of
bits of an HS-DSCH
transport block
received within
an HS-DSCH TTI
NOTE 1
Max bit
rate(Mbps)
Supported
modulations
without MIMO
operation
Supported
modulations
simultaneous
with MIMO
operation
Category 12 5 1 3630 1.8
Category 13 15 1 35280 17.6 QPSK, 16QAM,
64QAMCategory 14 15 1 42192 21.1
Category 15 15 1 23370 23.3QPSK, 16QAM
Category 16 15 1 27952 27.9
Category 17
NOTE 215 1
35280 17.6QPSK, 16QAM,
64QAM –
23370 23.3 – QPSK, 16QAM
Category 18
NOTE 315 1
42192 21.1 QPSK, 16QAM,64QAM
–
27952 27.9 – QPSK, 16QAM
Category 19 For future use; supports the capabilities of category 17 in this version of the protocol
Category 20 For future use; supports the capabilities of category 18 in this version of the protocol
2. NodeB
(a) For the DBS3800, only the enhanced downlink baseband processing board (EBBC)
supports the HSPA+.
(b) For the DBS3900 or BTS3900/3900A, only the WBBPb or later version baseband
board supports the HSPA+.
(c) For the BTS3812E/AE,BTS3812/3806/3806A, the EBBI must be configured. If there
is no EBBI, the HBBI+EDLP or EULP+EDLP must be configured to support the
64QAM, and the EULP+EDLP must be configured to support the MIMO.
(d) For the BTS3801C/3803C, it supports the HSPA+ with EBBM board added.
3. RNC
(a) For the V1 (BSC6800) platform, only the FMRc or later versions support this feature.
(b) For the V2 (BSC6810) platform, there is no limitation.
1.2.2 Version Support
Product Version
RNC BSC6800 Versions later than BSC6800V100R011C00
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Node B
DBS3800/BTS3801C/3803C
Versions later than DBS3800V100R011C00
BTS3812E/AEVersions later than
BTS3812E-12AC-12AE-BTS3812AV100R011
C00
BTS3812/3806/3806AVersions later than
BTS3812-BTS3806-BTS3806AV100R011C00
DBS3900/
BTS3900/BTS3900AVersions later than V200R011C00
Table 4 Version support table
1.3 Principles
1.3.1 HSPA+ Code Allocation Policy
HS-PDSCH: The HSPA throughput of a cell depends on the number of HS-PDSCH codes in the
cell. The maximum number of codes supported by a UE depends on the HSDPA category of the
UE. Generally, the HSPA+ code allocation policy is the same as that of RAN10. The HSPA+
introduction requires more code resources. Therefore, more HS-PDSCH codes must be configured
to meet high speed requirements. HS-PDSCH codes can be allocated in following modes:
Static code allocation
Dynamic code allocation controlled by the RNC
Dynamic code allocation controlled by the Node B
An HS-SCCH carries the information about the downlink HS-PDSCH allocated for each UE.
The information carried in the HS-SCCH includes the information required by the UE to
demodulate the HS-PDSCH, including UE ID, HS-PDSCH code allocation information,
modulation mode, and transport block size. Each HS-SCCH contains 128 spreading factors (SFs).
Within 2ms TTI, the information carried on each HS-SCCH is intended for one UE. To schedule
multiple UEs within 2 ms, multiple HS-SCCHs are required.
1.3.2 Flow Control
The HSPA+ introduces the Enhanced Layer 2, E-FACH, CS AMR over HSDPA. Therefore, the
flow control policies of the HSPA+ differ from those of RAN10. However, the general goal is to
transmit traffic through the MAC-d flow of the Iub interface to make full use the bandwidth of the
Iub interface, cooperate with the HSPA+ scheduling to make efficient use of resources of the Iub
interface, and ensure that services with higher priorities are transmitted preferentially. The main
difference is that no flow control policies are adopted for the SRB, IMS, VOIP, CS over HSDPA
and flow control policies of the E-FACH are added. This document only involves the 64QAM and
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MIMO and ignores new flow control policies.
Purposes of flow control are as follows:
Control the transmission of the HSPA data stream of the MAC-d or MAC-c/sh
from the RNC on the Iub interface.
Implement the traffic shaping function on the Iub interface.
Ensure that the queue buffer saves enough data to be transmitted.
The flow control requires to consider the following factors:
Transmission capability of the Uu interface
Transport bandwidth on the Iub interface
Buffer usage of the Node B
Amount of data to be transmitted on the RNC
Packet loss ratio on the Iub interface
Transmission delay on the Iub interface
1.3.3 Scheduling
The object of the scheduling algorithm is all the UEs that need to share the HSPA+ and HSPA
channels. The scheduling algorithm is used to balance the resources and UEs. Compared with
RAN10.0, the HSPA+ increases the Layer 2 Enhancement and CS AMR over HSDPA, affects the
scheduling algorithm, supports Layer 2 Enhancement and enhancement technology in the physical
layer, and optimizes the QoS guarantee policies of the non-real-time service (background or
interactive service) and real-time services such as Streaming, VoIP, CS AMR carried on the
HS-DSCH.
Factors to be considered are as follows:
Consider the fairness. Make sure that every UE has the chance to transmit data.
Consider the channel conditions. A channel with a high carrier-to-interference
rate (C/I) and a great CQI is more likely to be chosen.
Consider the priority. The UE with higher priority tends to be chosen.
Common scheduling algorithms are as follows:
RR Scheduling: This algorithm schedules all the UEs in turn. It aims at ensuring
fairness, that is, each UE can be served in a certain period of time.
Max C/I: It aims at obtaining the maximum system capacity and highest resource
utilization without considering the fairness.
PF: Proportion equity scheduling algorithm. Regard the RR and Max C/I as
special PFs.
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EPF: Enhanced proportion equity scheduling algorithm.
PF-QoS: General name of algorithms (based on the PF algorithm) aiming at
ensuring the quality of services (new algorithm in RAN11.0).
1.3.4 Power Control on HSPA+ Channels
Similar to physical channels of RAN10.0, HSPA+ channels include UL HS-DPCCH, DL
HS-PDSCH, and DL HS-SCCH. Power control on HSPA+ channels refers to that on these three
types of channels. Dynamic power control is recommended.
1.3.5 HSPA+ RRM Policy
Similar to the RAN10.0, the HSPA+ admission control includes power admission control on
streaming and BE services and admission control of bandwidth of the Iub interface.
To support the enhancement function of the inter-frequency networking, the HSPA supports the
DRD function. The DRD function can be triggered by the following factors: The HSPA service is initiated in cell R99.
Traffic
Retry timer
Access failure of the HSPA service
The load control policy of the HSPA+ is similar to that of the HSDPA.
LDR algorithm: If the usage of cell resources exceeds the basic congestion threshold, the cell
enters into the basic congestion state. In this case, the cell triggers the LDR to relieve the cell
resource congestion.
OLC algorithm: When the uplink or downlink power in an R99 cell exceeds the uplink ordownlink triggering threshold for OLC, the R99 cell enters into the overload congestion state. To
ensure the system stability, fast OLC actions are required to quickly eliminate the overload
congestion of the cell. If the uplink or downlink power of R99 cell is lower than the uplink or
downlink congestion releasing threshold for OLC, the R99 cell enters into the basic congestion
state.
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Chapter 2 Introduction to Basic Principles
2.1 Overview of Basic HSPA+ Principles
In R6, the HSDPA increases a transmission channel (HS-DSCH) and three physical channels, that
is, HS-SCCH, HS-PDSCH, and HS-DPCCH. The HSPA+ still uses the preceding channels of the
HSDPA. However, the channel structure changes. This is described in following parts.
At Node B, the HSDPA increases the multi-user scheduling function and rapid retransmission
function in the physical layer, Adaptive Modulation and Coding (AMC), Hybrid Automatic Repeat
Request (HARQ), and fast scheduling. These technologies aim at improving the downlink user
throughput and resource utilization. However, the HSPA cannot support the rapid power control
function and there is no combining gain of downlink HSPA channels during soft handover.
To support the high-speed data transmission capability of the HSPA+, the Layer 2 Enhancement
technology is introduced in R7 to flexibly adapt to changes of the Uu interface. In addition, the 64
QAM and MIMO must be based on the Layer Enhancement technology, that is, the two
technologies can be implemented only when the Layer Enhancement technology is supported. The
R7 protocol specifies that a UE cannot adopt both the 64 QAM and the MIMO at the same time.
2.2 Key Technologies of HSPA+
2.2.1 Adaptive Modulation and Coding
The basic method of implementing the adaptive modulation and coding (AMC) technology is to
measure the quality of downlink channels and adjust the coding and modulation solution in an
adaptive manner based on the measurement result (expressed by CQI) to select the appropriate
modulation and coding rate to maximize the data transmission rate. The 1/3 Turbo code is the
basic code. The modulation modes include QPSK, 16QAM, and 64QAM. The 64QAM high-order
modulation which is a new function of the HSPA+ is used to improve the downlink peak rate.
2.2.2 HARQ
The Hybrid Automatic Repeat Request (HARQ) is an error correction technology. The HARQcombines the forward error code (FEC) and automatic Repeat Request (ARQ) technologies. R99
and R44 adopt the traditional ARQ method that is implemented on the RLC layer.
Similar to the HSDPA, the HSPA+ adopts the SAW HARQ protocol. If the SAW HARQ protocol
is adopted, for each channel, the next data packet is transmitted only when the correct
acknowledgement information of the previous data packet is received. The protocol is simple, but
the channel utilization is low. The SAW HARQ protocol can solve the problem of low channel
utilization.
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2.2.3 Schedule
Similar to the HSDPA, the HSPA+ provides downlink HS-DSCHs for all the users to transmit
data.
Resources are shared through code multiplexing and time multiplexing.
All codes to which
HSDPAtransmission
is mapped
(5 in this example)
Data to UE #1 Data to UE #2 Data to UE #3 CodeCode
Time
Figure 1 Code multiplexing combination
Rapidly schedule different UEs to allocate resources to users with high-quality channels to greatly
improve system capacity.
2.2.4 Layer 2 Enhancement
Before the Layer 2 Enhancement technology is introduced in the R7 protocol, RLC PDU Size is
set to a fixed value. Due to the great change of the transmission of the Uu interface, RLC PDU
Size is usually set to 320 bits or 640 bits. By default, RLC Window Size is set to 2048. According
to the preceding typical configuration, the RTT delay between the data sending to the receiving of
the acknowledge message is 100 ms, and the supported highest transmission rate is 13.1Mbps
(Formula: 640bits x 2048/0.1s = 13.1Mbps). This cannot meet the high-speed requirement of the
HSPA+. Therefore, the Layer 2 Enhancement technology is introduced.
The basic principle of the Layer 2 Enhancement technology is to introduce a variable length PDU
in the RLC layer. According to the protocol, the RLC layer supports up to 1500-byte PDU. In
addition, to support the Layer 2 Enhancement technology, MAC-ehs is introduced in the MAC,
and the related HS-DSCH FP changes.
2.2.5 64QAM High-Order Modulation
The 64QAM technology adopts higher order modulation to provide data traffic higher than the
HSDPA by quickly adjusting downlink modulation and coding mode in better radio environment.
Theoretically, if the 64QAM technology is adopted, the peak rate is 21.096 Mbit/s (Formula:
TB_Size/TTI = 42192 / 2ms = 21.096 Mbit/s)
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2.2.6 2x2MIMO
Using the space diversity method, the MIMO technology adopts the multi-antenna technology on
the transmitting end and receiving end to improve the transmission capacity of the radio
communication system by several times without increasing transmit power and bandwidth in thehigh SNR environment (the transmission capacity is in proportion to the number of antennas).
Currently, the typical scenario is 2x2MIMO, that is, dual-fed and dual-receiving mode.
Theoretically, if the MIMO technology is adopted, the peak rate is 27.952 Mbit/s (Formula:
TB_Size/TTI = 27952 / 2ms x 2 (double data stream) = 27.952 Mbit/s)
Note that the 64QAM and MIMO cannot be configured in the R7 protocol at the same time.
2.3 Structure of HSPA+ Channels
The HSPA+ uses the same channels with the HSDPA, such as HS-DSCHs used for carrying
downlink user data, HS-SCCHs used for carrying downlink control information, and HS-DPCCHsused for carrying uplink control information. For the HSPA+, the structure of HS-DSCHs is
reserved. However, structures of HS-SCCHs and HS-DPCCHs change. This is described in
subsequent parts.
2.3.1 HS-DSCH
As downlink shared channels, HS-DSCHs are used to carry downlink user data. The spreading
factor of each HS-DSCH is fixed to 16. In each cell, a maximum of 15 SFs (equal to 16) are
configured for HS-DSCHs. All UEs share these HS-DSCHs through the time multiplexing and
code multiplexing.
The number of configured HS-DSCH codes determines the HSPA capability of the cell. Thenumber of HS-DSCH codes used by the UE depends on the capacity. To adapt to high-speed data
transmission and rapid response to channel changes, the TTI of HS-DSCHs is 3slot, that is, 2ms.
The BTS schedules UEs in a TTI of 2ms. Compared with HSDPA channels, HS-DSCHs of the
HSPA+ support 64QAM high-order modulation. Therefore, the spectral efficiency is improved
further.
HS-DSCHs support the retransmission gain combing through the HARQ mechanism.
HS-DSCHs do not support rapid power control and select the appropriate channel code
combination, chip rate, and modulation mode.
Slot #0 Slot#1 Slot #2
T slot = 2560 chips, M*10*2 k bi ts (k= 4)
Data
data 1 bi ts
1 subframe: T f = 2 ms
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Figure 2 Structure of an HS PDSCH frame
2.3.2 HS-SCCH
HS-SCCHs are downlink shared channels. Each HS-SCCH carries the information required for the
UE to demodulate the HS-PDSCH, including UE ID, HS-DSCH code allocation information,
modulation mode, and transport block size. Through the information, the UE determines whether
the data on HS-DSCHs are sent to the UE and how to receive the data.
The information carried by HS-SCCHs is important for the UE to demodulate the HS-DSCHs.
HS-SCCHs transmit information two slots in advance than the corresponding HS-DSCHs.
Therefore, the UE decides whether to demodulate HS-DSCHs after demodulating HS-SCCHs.
The spreading factor of each HS-SCCH is 128. In a 2-ms TTI, the information carried on each
HS-SCCH can only be used for one UE. Therefore, multiple HS-SCCHs must be configured if
you schedule multiple UEs within 2 ms. A UE monitors a maximum of four HS-SCCHs at the
same time.
Slot #0 Slot#1 Slot #2
T slot = 2560 chips, 40 bit s
Data
N data 1 bit s
1 subframe: T f = 2 ms
Figure 3 Structure of an HS-SCCH frame
2.3.3 HS-DPCCH
HS-DPCCHs are uplink dedicated hannels. The spreading factor is 256. An uplink HS-DPCCH
must be established for an HSPA-enabled UE. The uplink HS-DPCCH and other uplink channels
of the UE adopt the code multiplexing mode. For non-MIMO users, information carried on
HS-DPCCHs includes the ACK/NACK message used for the rapid retransmission in the physical
layer and the CQI (channel quality result) measured by the UE. The BTS determines whether to
transmit downlink data through the information.
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S u b f ra m e # 0 S u b f ra m e # i S u b f ra m e # 4
H A R Q - A C K C Q I
O n e r a d io f ra m e T f = 1 0 m s
O n e H S - D P C C H s u b fra m e (2 m s )
2 T s l o t = 5 1 2 0 c h i p sT s l o t = 2 5 6 0 c h i p s
Figure 4 Structure of a non-MIMO HS-DPCCH frame
For MIMO users, the PCI information is added in the HS-DPCCH frame. Figure 5 shows that the
PCI is added behind the CQI.
S u b f r am e # 0 S u b f ra m e # i S u b f r a m e # 4
H A R Q - A C K C I /P C I
O n e r a d io f r a m e T f = 1 0 m s
O n e H S - D P C C H s u b fr am e ( 2 m s )
2 T s l o t = 5 1 2 0 c h i p sT s l o t = 2 5 6 0 c h i p s
Figure 5 Structure of a MIMO HS-DPCCH frame
2.4 Data Transmission on Physical Layer of HSPA+
This section describes data transmission on the physical layer of the HSPA+. Then, you can
understand the role of each channel during the data transmission.
If the setup of an HSPA+-enabled cell is supported, the BTS establishes downlink channels in
terms of the number of HS-DSCH codes and the number of HS-SCCH codes.
After an HSPA service is established, the UE continually measures the signal quality in the radio
environment, calculates the CQI according to the pilot of the cell and the Measure Power Offset(MPO) configured for the UE by the BTS, and reports the CQI to the BTS through uplink
HS-DPCCHs.
The UE continually monitors the downlink HS-SCCHs to check whether the data is sent to the
UE.
After receiving the CQI, the BTS determines whether to send the data to the UE according to the
CQI, PCI (only for MIMO users), BTS resource utilization, and UE capability. If yes, the BTS
transmits the data block information, including the data block size, codes to be used, modulation
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mode, and UE ID through HS-SCCHs. After two timeslots, the BTS transmits the data blocks of
the UE on HS-DSCHs.
If the UE finds that the data block information on HS-SCCHs is transmitted to the UE, the UE
demodulates the HS-DSCHs by using the obtained information after two timeslots to obtain the
data block information.In step 2, the CQI reporting period is set by the BTS to 2 ms, 4 ms, 8 ms, or 16 ms. Steps 3–5 are
performed every 2 ms.
2.5 MAC-ehs Entity
Figure 6 MAC-ehs entity
After the Layer 2 Enhancement is introduced, MAC-ehs entities are added in the MAC
layer of the Node B. Each cell has only one MAC-ehs entity.
If the UE supports the Layer 2 Enhancement technology during the HSDPA downlink data
transmission, you can configure MAC-ehs or MAC-hs entities to process data transmitted
on HS-DSCHs. The Layer 2 Enhancement technology is the basis of the 64QAM, MIMO,
and Cell FACH. The RNC determines whether to configure the UE to use MAC-ehs
entities according to the capability of the cell and UE. The great difference between the
MAC-ehs and the MAC-hs is that the MAC-hs supports data segmentation and
concatenation, supports multiple prior queues (a maximum of three), reorders and
multiplexes SDUs (a maximum of 26) to MAC-ehs PDUs (2x2MIMO, that is, two MAC-ehs
PDUs are transmitted during a TTI).
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2.6 HSPA+ Signaling Plane and User Plane
2.6.1 HSPA+ Signaling Plane
With the introduction of the 64QAM and MIMO, certain information elements are added and
related signaling procedures are affected. The following signaling procedures are for reference
only.
If the Node B supports the 64QAM or MIMO, the support capability must be notified to the
64QAM-enabled UEs...
1. Resource audit procedure
CRNC Node B
AUDIT REQUEST
AUDIT RESPONSE
Figure 7 Resource audit procedure
If a local cell supports the 64QAM or MIMO, the AUDIT RESPONSE from the Node B to the
RNC must include the indication that the 64QAM or MIMO is supported.
2. Resource status indication
CRNC Node B
RESOURCE STATUS INDICATION
Figure 8 Resource status indication
If a local cell supports the 64QAM or MIMO, the RESOURCE STATUS INDICATION from
the Node B to the RNC must include the indication that the 64QAM or MIMO is supported.
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2.6.2 Data Transmission on HSPA User Plane
1. HS-DSCH data frame
Figure 9 Type 2 HS-DSCH data frame
The Layer 2 Enhancement technology is introduced in the HSPA+. Therefore, the type-2 data
frame is added as shown in the preceding figure. The type-2 data frame supports the variable PDU
size, and the frame header indicates the length of different data blocks.
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2. Control frame on user plane
N o d e B C R N C
C A P A C I T Y R E Q U E S T
Figure 10 Capacity request frame
Capacity allocation: The Node B sends the CAPACITY ALLOCATION message to the RNC to
notify the amount of data transmitted by the RNC in a certain period of time.
N o d e B C R N C
C A P A C I T Y A L L O C A T I O N
Figure 11 Capacity allocation frame
After the Layer 2 Enhancement technology is introduced, the capacity allocation frames can be
classified into type 1 data frames and type 2 data frames. For HSDPA users supporting the Layer 2
Enhancement technology, type 1 data frames are adopted. Otherwise, type 2 data frames areadopted.
2.7 Mobility Management
2.7.1 HSPA+ Intra-Frequency Handover Policy
From the perspective of mobility, the HSPA+ is the same as R5 HSDPA, that is, the mobility
control is based on changes of the serving cell, and the serving cell changes through the 1x events.
To achieve high-quality data transmission on HS-DSCHs, the RNC is required to map the RAB to
the HS-DSCHs of the best serving cell. Generally, the 1D measurement event (change of the best
serving cell) is used to trigger the changes of the HS-DSCH serving cell to.
The introduction of the HSPA+ brings the following impacts on mobility:
Add intra-frequency handover between 64QAM cells or MIMO cells.
Add the handover between 64QAM cells and HSDPA/R99 cells or between MIMO
cells and HSDPA/R99 cells due to changes of the cell capability.
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UEs in the CELL_DCH state can use technologies such as 64QAM, MIMO, Layer 2
Enhancement. The prerequisite is that the corresponding cell implements the HSPA+
feature.
2.7.2 HSPA+ Inter-Frequency Handover Policy
The inter-frequency handover policies of the HSPA+ are the same as those of the HSDPA. The
hard handover can be performed when the serving cell is being upgraded.
Intra-Node B hard handover adopts the same signaling procedure with the inter-Node B hard
handover. In this procedure, radio links and HS-DSCHs are set up in the new cell, physical
channels are reconfigured, and old links are removed.
2.7.3 HSPA+ Inter-System Handover Policy
3G->2G handover
The 3G-to-2G handover process of an HSPA+-enabled UE is the same as that of an
HSDPA-enabled UE. If the HSPA+-enabled UE is set to disable the compression mode through
the SET CMCF command, services are carried on DCHs (the compression mode is enabled).
Then, the UE switches to the 2G network.
When services of the HSPA+-UE are carried on DCHs, the H2D process is started. The Uu
interface and the Iub interface complete the RB reconfiguration and the RL reconfiguration
respectively to run the service on DCHs instead of HS-DSCHs.
2G->3G handover
The 2G-to-3G handover process of the HSPA+ is the same as that of the HSDPA. If HS-DSCHs
can carry the RAB with requested rate, the RB is set up on HS-DSCHs.
Chapter 3 Upgrade Guide
3.1 RNC Upgrade
3.1.1 Upgrade Requirement
The following table lists the recommended RNC versions for commercial use.
Table 5 Recommended RNC version
Recommended RNC Version Whether to Support
HSPA+ 64QAM&MIMO
BSC6800V100R011C00SPC120
or later version
Yes
BSC6810V200R011C00SPC120 Yes
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or later version
To support the HSPA+ commercialization, the RNC hardware configuration does not impose
special requirement on the BSC6810. For the BSC6800, at least the FMRc is configured to
support the HSPA+. Unless otherwise stated, the following upgrade steps are applicable to
RAN11.0 V1 and V2.
3.2 NodeB Upgrade
1. Before upgrading, please confirm the hardware of NodeB support HSPA+ commercialization,
the content refers to Chapter 1.2.1
2. The following table lists the recommended NodeB versions for commercial use.
Table 6 Recommended NodeB version
Type of NodeB Recommended NodeB Version Whether to
Support
HSPA+
64QAM&MI
MO
DBS3800/BTS3801C/3
803C
Versions later than
DBS3800V100R011C00SPC200
Yes
BTS3812E/AE
Versions later than
BTS3812E-12AC-12AE-BTS3812AV100R011C
00SPC200
Yes
BTS3812/3806/3806A
Versions later than
BTS3812-BTS3806-BTS3806A
V100R011C00SPC200
Yes
DBS3900/BTS3900/BT
S3900AVersions later than V200R011C00SPC200
Yes
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Chapter 4 Data Configuration Policy
4.1 HSPA+ Network Establishment
4.1.1 GGSN Configuration (Huawei)
The HSPA+ provides a higher throughput than the HSDPA. That is, the UMTS supports a higher
rate. In addition, capacity-related attributes must be set on the GGSN.
Run the following command to set the maximum rate to 256000 kbit/s.
SET QOS: MBRDNLK=256000, GBRDNLK=256000;
(1) On the GGSN, run the commands LST QoS and SET QoS to check whether the uplink and
downlink data rate reaches the required value. If not, modify the uplink and downlink data rate.
(2) On the GGSN, run the LST APNQoS command to check whether the uplink data rate of a
certain APN is set. If not, do not set or ignore the rate. If yes, check whether the rate reaches the
required value. If not, set the rate value.
4.1.2 SGSN Configuration (Huawei)
The method of configuring the SGSN is similar to that configuring the GGSN.
Set the Extended MBR to 250 (MBRDNLKEX 250 represents 256 Mbit/s).
SET 3GSM: PARATYPE=QOS, MBRUPLK=254, GBRUPLK=254, MBRDNLK=254,
GBRDNLK=254, MBRDNLKEX=250, GBRDNLKEX=250, MBRUPLKEX=250,
GBRUPLKEX=250;
SET PROCR: RNCQOSVERSION=R7, GGSNQOSVERSION=R7,
SGSNQOSVERSION=R7;
Set the RNC version to R7. Note that the following command corresponds to the index of the
RNC actually used.
MOD RNC: IMS=YES, RNCVER=R7, R7QOS=YES;
Set the QoS attribute of a certain GGSN to R7Qos.
MOD GGSNCHARACT: IPT=IPV4, QOSVER=R7Qos;
On the SGSN, run the commands LST COMPATIBILITY and SET COMPATIBILITY to set
RABQOS to YES.
SET COMPATIBILITY: RABQOS=YES;
4.1.3 Registration Rate Configuration
According to the rate requirement of the operator, set the downlink data rate. If the HSPA+ feature
is supported, the rate is expanded to 21 Mbit/s (if the 64QAM is supported) or 28 Mbit/s (if the
MIMO is supported).
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4.2 Check on Transmission Configuration on Iub or Iu
Interface
4.2.1 Check on Transmission Configuration on Iub Interface
Add the types of paths that transmit the HSPA service on the RNC and NodeB sides. The HSPA+
improves the transmission requirement of the Iub interface. Therefore, it is recommended to adopt
IP networking on the Iub interface. For the bandwidth configuration of the IP RAN, refer to the
HSPA+ bandwidth configuration of the IP RAN deployment guide.
You can check the bandwidth in the ATM network by using the following method:
ADD AAL2PATH: AAL2PATHT=HSPA;
On the RNC, run the DSP AAL2 PATH command to check the available bandwidth of the AAL2
path carrying the HSPA. If the HSPA+ is supported, set the bandwidth to the maximum value.
On the Node B, the size of HSPA+ bandwidth depends on the Receive Cell Rate (RCR). Check the
RCR of the AAL2 path. It is recommended that the RCR is set to a maximum of 20 Mbit/s to
impose strict requirement on the HSPA+ bandwidth. However, for a single user, this rate cannot
meet the peak value requirement (this cannot meet the peak rate requirement of a single UE).
4.2.2 Check on Bandwidth of Iu-PS Interface
(1) Run the LST IPOA command to check the traffic index of the user plane.
(2) Run the LST TRAFFIC command to check the bandwidth corresponding to the traffic index.
You also can obtain the supported rate, PCR peak cell rate (cells/s), and cell rate (cells/s)
corresponding to the traffic index. If the supported rated is too low, you can modify it manually.
1000 bit/s is recommended.
4.2.3 Node B Configuration
The 64QAM-enabled or MIMO-enabled cell must be set up on the enhanced board. Otherwise, the
HSPA+ feature is not supported. After the cell is set up, check whether the downlink resource
group is established on the enhanced board, that is, run the DSP LOCELLRES command to
check whether the downlink resource group established on the enhanced board or not.
For the BTS3812E, the number of the slot that controls the downlink resource group is the number
of that houses the EBBI, EULP, or EDLP.
For the DBS3800, the number of the slot that controls the downlink resource group is the number
of that houses the EBBC.
For the DBS3900, the number of the slot that controls the downlink resource group is the number
of that houses the WBBPb.
For the BTS3801C/3803C, it supports the HSPA+ with EBBM board added.
The configuration of a local 64QAM cell is the same as that of an HSDPA-enabled cell. For an
MIMO-enabled cell, however, you must configure the NodeB and the cell must supports the
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transmit diversity mode. In addition, the local cell can be configured in serial connection mode or
parallel connection mode. The former is recommended.
4.2.3.1 Node B Configuration of MIMO-Enabled Cell in Parallel Connection Mode
1. Run the following command to add two RRUCHAINs:
ADD RRUCHAIN: RCN=0, TT=CHAIN, HSN=0, HPN=0;
ADD RRUCHAIN: RCN=1, TT=CHAIN, HSN=0, HPN=1;
2. Run the following command to add two RRUs:
ADD RRU: SRN=20, TP=TRUNK, RCN=0, PS=0, RT=MRRU;
ADD RRU: SRN=21, TP=TRUNK, RCN=1, PS=0, RT=MRRU;
3. Run the following command to add a SEC and select the common mode:
ADD SEC: STN=0, SECN=0, SECT=REMOTE_SECTOR, ANTM=2,DIVM=COMMON_MODE;
4. Run the following command to add a local cell, set the dual-fed capability to True, and
configure two power amplifiers.
ADD LOCELL: LOCELL=0, STN=0, SECN=0, SECT=REMOTE_SECTOR,TTW=TRUE, SRN1=20, SRN2=21, HISPM=FALSE, RMTCM=FALSE;
4.2.3.2 Node B Configuration of MIMO-Enabled Cell in Serial Connection Mode
The configuration of the RRU cell in serial connection mode is the same as that in parallel
connection mode. The only difference is that only one RRUCHINA is required in serial
connection mode.
1. Run the following command to add an RRUCHAIN:
ADD RRUCHAIN: RCN=0, TT=CHAIN, HSN=0, HPN=0;
2. Run the following command to add two RRUs on an identical RRUCHAIN:
ADD RRU: SRN=20, TP=TRUNK, RCN=0, PS=0, RT=MRRU;
(Position 0)
ADD RRU: SRN=21, TP=TRUNK, RCN=0, PS=1, RT=MRRU;
(Position 1)
3. Run the following command to add a SEC and configure the Tx diversity.
ADD SEC: STN=0, SECN=0, SECT=REMOTE_SECTOR, ANTM=2,DIVM=COMMON_MODE;
4. Run the following command to add a local cell, set the dual-fed capability to True, and
configure two power amplifiers.
ADD LOCELL: LOCELL=0, STN=0, SECN=0, SECT=REMOTE_SECTOR,TTW=TRUE, SRN1=20, SRN2=21, HISPM=FALSE, RMTCM=FALSE;
4.2.4 RNC Configuration
1. Hardware check: For the BSC6800, the RNC requires to use the FMRc board to support
the HSPA+ feature; for the BSC6810 platform, there is no hardware limits.
2. Run the following command to enable the HSDPA feature to configure attributes of the
64QAM and the MIMO.
SET CORRMALGOSWITCH:CfgSwitch=CFG_HSDPA_64QAM_SWITCH-1&CFG_HSDPA_MIMO_SWITCH-1;
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3. Run the following command to turn on the switch of the 64QAM, MIMO, and Layer 2
Enhancement in the algorithm.
MOD CELLALGOSWITCH:HspaPlusSwitch=64QAM-1&MIMO-1&L2ENHANCED-1;
4. The license supports the enabling of the switch of 21 Mbit/s and 28 Mbit/s (You can runthe DSP LICENSE command to check the switch configuration).
5. Run the following command to activate the corresponding HSPA+ cell:
ACT CELLHSDPA: CellId=0;
6. For the MIMO-enabled cell, run the ADD QUICKCELLSETUP command to set up a
local cell and run the MOD CELLSETUP command to configure the transmit diversity
and STTD attributes.
MOD CELLSETUP: CellId=0, TxDiversityInd=TRUE,STTDSupInd=STTD_Supported, CP1SupInd=CP1_not Supported,DpchPrioTxDiversityMode=STTD,HspdschPrioTxDiversityMode=STTD, DpchDivModforMIMO=STTD;
7. For the MIMO-enabled cell, run the following command to activate the MIMO feature:ACT CELLMIMO;
4.3 Service and Bearer Configuration
4.3.1 HSPA+ Configuration During Registration
All registration-related information is configured on the HLR. HSPA+-related parameters are
described previously and determined by operators according to requirements.
4.3.2 Code Allocation of HSPA+-Enabled Cell
The code allocation is based on the cell. Fixed code allocation and RNC-based dynamic code
allocation are configured on the RNC. Node B-based dynamic code allocation is configured on the
Node B. The code allocation configured on the RNC and that on the Node B do not affect each.
That is, you can enable the Node B-based dynamic code allocation when configuring the fixed
code allocation on the RNC, or disable the Node B-based dynamic code allocation when
configuring the dynamic code allocation on the RNC.
It is recommended to enable the Node B-based dynamic code allocation. Thus RNC using fixed
code allocation. Run the ADD CELLHSDPA command to configure code allocation in the RNC,
for example, configure the static code allocation policy and allocate two HS-SCCH codes.
ADD CELLHSDPA: AllocCodeMode=Manual, HsPdschCodeNum=1,
HsScchCodeNum=2, CodeAdjForHsdpaSwitch=ON;
If the Node B-based dynamic code allocation is closed. Run the following command to configure
RNC-based dynamic code allocation policy, set the maximum number of HS-PDSCH codes to 15,
the minimum number HS-PDSCH codes to 1, and the number of HS-SCCH codes to 2.
ADD CELLHSPA: CellId=1, AllocCodeMode=Automatic,HsPdschMaxCodeNum=15, HsPdschMinCodeNum=1,HsScchCodeNum=2;
To enable the Node B-based dynamic code allocation policy, run the SET MACHSPARA
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command as follows:
SET MACHSPARA: LOCELL=1, DYNCODESW=OPEN;
The dynamic code allocation policy adopted on the Node B is not detected on the LMT of the
RNC. If idle codes (SF=16) are available, these codes are allocated to the HSPA.
4.3.3 Power Configuration of HSPA+-Enabled Cell
Run the ADD CELLHSDPA command to configure the power of the HSPA+-enabled cell in the
RNC by using.
ADD CELLHSDPA: AllocCodeMode=Automatic, HspaPower=0;
The configured power is the power offset of the maximum transmit power of the HSPA+-enable
cell.
4.3.4 HSPA+ Scheduling and Flow Control Configuration
The scheduling algorithm is configured on the Node B by using the SET MACHSPARA
command, for example, you can run the following command to adopt the EPF scheduling
algorithm on the Node B:
SET MACHSPARA: SM=EPF
It is recommended to adopt default settings of flow control parameters.
For the flow control policy, DYNAMIC_BW_SHAPING or NO_BW_SHAPING can be selected
automatically through the congestion check mechanism.
You can also run the following command to configure the flow control policy:
SET HSDPAFLOWCTRLPARA: SWITCH=BW_SHAPING_ONOFF_TOGGLE;
4.3.5 HSPA+ Power Control Configuration
The power control of HS-DPCCHs is configured on the RNC by using the SET HSDPCCH
command.
It is recommended to adopt baseline parameters.
The power control of HS-SCCHs is configured on the Node B by using the SET MACHSPARA
command, for example, to adjust the HS-SCCH the power control based on the CQI, set the offset
relative to the initial power of the PCPICH to 0dB, and set the frame error rate to 1%, run the
following command:
SET MACHSPARA: SCCHPWRCM=CQI, SCCHFER=10;
To set the power margin of the cell to 5% of the baseline value, run the following command:
SET MACHSPARA: PWRMGN=5;
4.3.6 QoS Guarantee Configuration of HSPA+
Run the SET USERPRIORITY command to map the ARP to the SPI. The following command
set the UE level of each ARP priority.
SET USERPRIORITY: ARP1Priority=Gold, ARP2Priority=Gold,ARP3Priority=Gold, ARP4Priority=Gold, ARP5Priority=Gold,ARP6Priority=Silver, ARP7Priority=Silver,
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ARP8Priority=Silver, ARP9Priority=Silver,ARP10Priority=Silver, ARP11Priority=Copper,ARP12Priority=Copper, ARP13Priority=Copper,ARP14Priority=Copper;
Run the SET SCHEDULEPRIOMAP command to map the UE service type and class to the SPI.
SET SCHEDULEPRIOMAP: TrafficClass=INTERACTIVE,UserPriority=SILVER, THP=10, SPI=5;
Run the SET USERGBR command to configure the GBR for BE services.
SET USERGBR: GoldUlGBR=D128, GoldDlGBR=D128,SilverUlGBR=D64, SilverDlGBR=D64, CopperUlGBR=D32,CopperDlGBR=D32;
In the preceding example, the GBR parameters use the baseline values. The values can be changed
according to the operator requirements.
4.3.7 License Configuration for HSPA+
Apply for licenses of the RNC to support the traffic of 21 Mbit/s and 28 Mbit/s.
*******************************************************************************
Note
You can query settings of the preceding parameters first. If these parameters are set to baseline values, the
modification is unnecessary.
*******************************************************************************
Radio Resource Management Configuration
4.3.8 HSPA+ Measurement Control Configuration
Generally, the following parameters are set to baseline values; therefore, you do not need to
modify parameter settings.Configuration related to HSPA+ measurement includes configuration of the measurement switch
and measurement period. Run the MOD CELLALGOSWITCH command to configure the
measurement switch. To measure the GBP and PBR, run the following command.
MOD CELLALGOSWITCH: CellId=1,NBMCacAlgoSwitch=HSPA_GBP_MEAS-1&HSPA_PBR_MEAS-1;
Run the SET LDM command to set the measurement period. To set the basic downlink
measurement period to 200 ms, run the following command:
SET LDM: ChoiceRprtUnitForDlBasicMeas=TEN_MSEC,TenMsecForDlBasicMeas=20;
To set the HSPA GBP measurement period and HSPA PBR measurement period to 1 second, run
the following command:SET LDM: ChoiceRprtUnitForHSPAPwrMeas=TEN_MSEC,TenMsecForHSPAPwrMeas=100;
SET LDM: ChoiceRprtUnitForHSPARateMeas=TEN_MSEC,TenMsecForHSPAPrvidRateMeas=100;
4.3.9 HSPA+ Admission Control Configuration
During deployment, use the baseline values of the following parameters. You do not need to
change the values of these parameters.
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Similar to that of the HSDPA, run the following command to turn on the admission control switch
of the HSPA+:
ADD CELLALGOSWITCH: NBMCacAlgoSwitch=HSPA_ADCTRL-1;
Run the following commands to turn on the Iub bandwidth admission switch.SET CACALGOSWITCH: CacSwitch=IUB_CONG_CAC_SWITCH-1;
ADD CELLALGOSWITCH: NBMCacAlgoSwitch=IUBBAND_ADCTRL-1;
Run the following commands to turn on the CE resource admission control switch.SET CACALGOSWITCH: CacSwitch=NODEB_CREDIT_CAC_SWITCH-1;
ADD CELLALGOSWITCH: NBMCacAlgoSwitch=CRD_ADCTRL-1;
4.3.10 HSPA+ DRD Configuration
The DRD policy of the HSPA+ is the same as that of the HSDPA. The following parameters are
set when the dual carrier is adopted during the deployment.
To support the DRD of the HSPA+, turn on the HSPA DRD algorithm switch and the blinkhandover switch when the inter-frequency concentric neighboring cell is configured.
To turn on the two switches, run the following commands:
SET CORRMALGOSWITCH:DrSwitch=DR_RRC_DRD_SWITCH-1;;
ADD INTERFREQNCELL:BlindHoFlag=TRUE, BlindHOPrio=0;
4.3.11 HSPA+ Load Control Configuration
During deployment, use the baseline values of the following parameters. You do not need to
change the values of these parameters.
When congestion occurs to a cell, the system can take multiple measures to relieve the congestion
of the cell. However, few actions are related to the HSPA service. The following commands are
related to the HSPA service.
Run the SET CORRMALGOSWITCH command to turn on the HSPA state transition switch,
intra-frequency D2H algorithm switch, and inter-frequency D2H algorithm switch.
SET CORRMALGOSWITCH:DraSwitch=DRA_HSDPA_STATE_TRANS_SWITCH-1&DRA_HSUPA_STATE_TRANS_SWITCH-1, DrSwitch=DR_RRC_DRD_SWITCH-1;
Run the ADD CELLALGOSWITCH command to turn on the load reshuffling algorithm switch,
code resource reshuffling algorithm switch, and CE resource reshuffling algorithm switch.
ADD CELLALGOSWITCH: CellId=1,NBMLdcAlgoSwitch=ULLDR-1&DLLDR-1&CELL_CODE_LDR-1&CELL_CREDIT_LDR-1;
Run theADD CELLLDR
command to control load reshuffling algorithm parameters. In addition,
the traffic type of the cell can be determined by traffic distribution.
ADD CELLINETSTRATEGY: R99CSSepInd=TRUE, R99PSSepInd=TRUE;
4.4 Typical HSPA+ Configuration in Competition Scenarios
If the uplink adopts R99 connections, you can adopt the fixed SIR Target in the case of high BER
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and set the initial value, maximum value, and minimum value to 172 (9dB) through the following
method:
1. Run the EXP INNERCFGMML command on the LMT to export internal scripts.
2. Search exported scripts for the index of the registered traffic corresponding to the uplink
384-kbit/s traffic, for example the traffic class is INTERACTIVE, and RABINDEX is 48.ADD TYPRABBASIC:RABINDEX=48,APPLIEDDIRECT=APPLIED_ON_BOTH, CNDOMAINID=PS_DOMAIN,TRAFFICCLASS=INTERACTIVE, MAXBITRATE=384000, SSD=UNKNOWN,TYPCFGSUPPORT=ON, BETAC=4, BETAD=15,SHIND=HO_TO_GSM_SHOULD_NOT_BE_PERFORM, REQ2GCAP=EDGE,ULFPMODE=SILENT;
3. Search scripts for corresponding outer loop power control parameter OLPC if the
RABINDEX is 48.
ADD TYPRABOLPC:RABINDEX=48, SUBFLOWINDEX=0,TRCHTYPE=TRCH_DCH, DELAYCLASS=1, BLERQUALITY=-20,BLERTARMAPIND=FALSE, SDUERRRATIOUPMANTISSA=9,SDUERRRATIOUPEXP=3, SDUERRRATIOLOWMANTISSA=1,SDUERRRATIOLOWEXP=6, MAXSIRSTEPUP=1000, MAXSIRSTEPDN=500,
SIRADJUSTSTEP=4, INITSIRTARGET=152, MAXSIRTARGET=172,MINSIRTARGET=152, SIRADJUSTPERIOD=2, TYPICALBERDPCCH=300,BERTARGET1=0, BERTARGET2=0, SIRSTEPUPONBER=0,SIRSTEPDOWNONBER=0, DTXBERTARFILTERCOEF=0,NONDTXBERTARFILTERCOEF=800;
4. Run the following command to modify the initial value, maximum value, and minimum
value (obtained from the output of the preceding command) to 172 (9dB).
MOD TYPRABOLPC:RABINDEX=48, SUBFLOWINDEX=0,TRCHTYPE=TRCH_DCH, DELAYCLASS=1, BLERQUALITY=-20,BLERTARMAPIND=FALSE, SDUERRRATIOUPMANTISSA=9,SDUERRRATIOUPEXP=3, SDUERRRATIOLOWMANTISSA=1,SDUERRRATIOLOWEXP=6, MAXSIRSTEPUP=1000, MAXSIRSTEPDN=500,SIRADJUSTSTEP=4, INITSIRTARGET=172, MAXSIRTARGET=172,MINSIRTARGET=172, SIRADJUSTPERIOD=2, TYPICALBERDPCCH=300,BERTARGET1=0, BERTARGET2=0, SIRSTEPUPONBER=0,SIRSTEPDOWNONBER=0, DTXBERTARFILTERCOEF=0,NONDTXBERTARFILTERCOEF=800;
5. Copy the preceding command to the blank area of the MML command to run this
command.
6. Check whether the SIR Target switch for the radio link reconfiguration is enabled. If not,
enable this parameter to notify modifications of parameter settings to the Node B.
s
7. After the demonstration, run the following command to change parameters to initial values.
Otherwise, performance of multiple UEs in the existing network is affected (copy the
following command to the blank area of the MML command and run this command).
MOD TYPRABOLPC:RABINDEX=48, SUBFLOWINDEX=0,
TRCHTYPE=TRCH_DCH, DELAYCLASS=1, BLERQUALITY=-20,BLERTARMAPIND=FALSE, SDUERRRATIOUPMANTISSA=9,SDUERRRATIOUPEXP=3, SDUERRRATIOLOWMANTISSA=1,SDUERRRATIOLOWEXP=6, MAXSIRSTEPUP=1000, MAXSIRSTEPDN=500,SIRADJUSTSTEP=4, INITSIRTARGET=152, MAXSIRTARGET=172,MINSIRTARGET=152, SIRADJUSTPERIOD=2, TYPICALBERDPCCH=300,BERTARGET1=0, BERTARGET2=0, SIRSTEPUPONBER=0,SIRSTEPDOWNONBER=0, DTXBERTARFILTERCOEF=0,NONDTXBERTARFILTERCOEF=800;
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Chapter 5 Networking Policy
5.1 Overview
With the rapid development of the HSPA+, it is an inevitable trend to introduce the HSPA+ to
commercial networks. The MIMO requires the STTD to set to ON. Therefore, the performance of
certain HSDPA terminals of R5 and R6 deteriorates due to the rollback of the receiver type.
Generally, it is recommended that a MIMO cell shares carriers with an R99 cell instead of an
HSDPA cell. The network policies of the 64QAM are the same as those of the HSDPA. A
64QAM-enabled cell can share the second carrier with an HSDPA-enabled cell. The networkings
of the 64QAM and MIMO are configured separately.
Considering actual operation scenarios and industry policies, the prerequisite to introduce the
HSPA+ is that the existing HSDPA or R99 services are not affected. That is, compared with the
HSDPA and HSPA+ services, the R99 service
1. The R99, HSDPA, and HSPA+ services can share power resources dynamically. However,
the R99 service is always preferred.
2. The R99, HSDPA, and HSPA+ services can share code resources dynamically. However,
the R99 service is always preferred.
3. The R99, HSDPA, and HSPA+ services fully share transmission resources. However, the
R99 service is always preferred.
To guarantee the smooth operation of the HSPA+ service, Configure a GBR for the HSPA+
service to ensure the minimum power, code, and transmission resources obtained by the service.
For the HSPA+-enabled dual-carrier service, the research focuses on how to allocate code, power,
and transmission resources to the HSPA+ and R99 service to achieve the maximum resource usage
in addition to the original features of the R99 service.
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5.2 HSPA+ 64QAM Dual-Carrier Service Allocation Policy
5.2.1 HSPA+ 64QAM Networking Mode I
The first carrier supports the R99 and HSPA services (including the HSDPA service and
HSPA+64QAM service) and implements continuous coverage. The second carrier supports the
HSDPA service and HSPA+ 64QAM service. The following figure shows the networking.
Figure 12 Dual-carrier networking I
The networking advantage is that either the networking policy or the configuration is simple, and
the uniform management is implemented in the network. One clear disadvantage is that the HSPA
fails to achieve load balancing. The R99 service can preempt either code or power resources of the
HSDPA service. Therefore, it is difficult to guarantee smooth operation of the HSDPA and HSPA+
64QAM services and trigger the load balancing between the two carriers. In addition, the load
balancing of the HSPA service brings fluctuations and the ping-pong effect.
5.2.2 HSPA+ 64QAM Networking Mode II
The first TRX implements continuous coverage and the second TRX covers hot spot areas. Both
the two TRXs support the R99 and HSPA+ 64 QAM.
R99+H R99+H R99+H
R99+H R99+H R99+H R99+H R99+HF1
F2
Hot Spot Hot Spot
1 21
R99+H R99+H R99+H
R99+H R99 R99 R99 R99+HF1
F2
Hot Spot Hot Spot
1 21
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Figure 13 Dual-carrier networking II
Networking mode II greatly differs from networking mode I in camping policies, mobility
management, and load control.
The advantage of networking mode II is to guarantee smooth operation of the R99 and HSPA+
64QAM services and ensure load balancing of the HSDPA service. The disadvantage is that the
networking is complex and involves multiple policies and configurations.
5.2.3 Comparison of Two HSPA+ 64QAM Networking Modes
Table 6 shows advantages and disadvantages of the two networking modes.
Table 7 Comparison of two networking modes
Scenario Name Advantage Disadvantage
Dual carrierscenario I: Both
two carriersprovide continuous
coverage of theHSPA service.
1. The two carriersimplementcontinuous
coverage of theHSPA service.
2. Both R99 andHSPA users canmake calls in this
cell, and the accessdelay is low.3. R99 users
implement load
sharing in hot spotareas. Therefore,cells served by the
two carriers achieveload balancing.4. HSPA usersimplement load
balancing throughrandom camping
policies.
1. The network isexpensive to construct.2. HSPA users do not
achieve load balancing.3. HSPA resources areconfigured preferentially
for each TRX. Therefore,it is hard to ensure the
smooth operation of theHSPA service.
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Dual carrierscenario II: HSPA
cells are notcovered
continuously(recommended).
1. The R99 serviceis covered
continuously by a
single TRX. Userscan obtain good
experience. 2. HSPA-enabled
UEs initiate PS callsin the cell covered
by frequency 2.Experience of HSPA
users is greatlyimproved because
there are fewer R99users in the cell.
1. If the HSPA-enabledUE enters from the area
covered by the singleTRX to that covered bydouble TRXs, the UE is
handed over to theintra-frequency R99 celland cannot be handed
over to theinter-frequency HSPA
cell. Therefore, theHSPA coverage cannot
be implemented. 2. When initiating a call,the HSPA-enabled UE is
handed over to aninter-frequency cell
through the DRD. Thiscan affect the access
delay of the UE.
To guarantee smooth operation of the HSPA service, commercial networks of Huawei adopt
networking mode II. Networking mode I involves simple policies, configuration, and algorithms
and is similar to common dual carrier networking.
5.3 Introduction to MIMO Networking Policy
If a MIMO-enabled cell shares one carrier with a common R5 or R6 cell, the type of the HSDPA
receiver rolls back and performance of HSDPA UEs deteriorates. Therefore, the MIMO
networking must be separate from the HSDPA networking. The general principle is as follows:
Maximize the MIMO capacity grain and balance powers of the two transmit channels.
Avoid performance loss of R5 HSPA UEs.
There are three MIMO networking modes.
5.3.1 MIMO Networking Mode I
The MIMO technology is deployed on a single frequency, which poses little impact on existing
networks. However, another frequency is required. Currently, most networks adopt dual carrier
networking, that is, at least operators provide three 3G frequencies.
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Figure 14 MIMO networking mode I
Advantage
The MIMO technology is deployed separately from existing networks. This imposes minimumimpacts on existing networks and does not affect the coverage, capacity, or KPIs.
Disadvantage
The MIMO technology requires to be deployed on an independent frequency and has extra
requirements on frequency resources. In the early application period, the penetration ratio of
MIMO-enabled UEs is low, and network resource usage is not high.
5.3.2 MIMO Networking Mode II
If frequency resources are limited, the MIMO deployment can be bound to the R99 service. This
avoids performance loss of old R5 HSPA UEs. The networking is as follows:
Figure 15 MIMO networking mode II
Advantage
Separate MIMO carrier from HSPA carriers. This avoids performance loss of original R5 HSPA
UEs in the diversity cell.
The MIMO service and R99 service are bound to an identical carrier to reduce the number of
required frequencies.
During the early period of the MIMO application, high-end users are fewer. Therefore, binding the
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MIMO and R99 services to an identical carrier improves user experience and increases network
resource usage.
Disadvantage
Binding the MIMO and R99 services to an identical carrier increases the average downlink load of
frequency F1 and affects KPIs of the R99 cell because the HSPA service consumes larger
downlink power. In this case, you can control uplink load to relieve these impacts.
5.3.3 MIMO Networking Mode III
If the operator increases the second TRX to deploy the HSPA+ during the Tx only networking, it
is recommended to deploy the MIMO on a single TRX. This imposes little impact on the existing
network. The networking is as follows:
Figure 16 MIMO networking mode III
Advantage
The MIMO technology is deployed separately from existing networks. This imposes
minimum impacts on existing networks and does not affect the coverage, capacity, or
KPIs.
Disadvantage
The MIMO technology requires to be deployed on an independent frequency and has
extra requirements on frequency resources. In the early period, the penetration ratio of
MIMO-enabled UEs is low, and network resource usage is not high. If the HSPA
performance loss is acceptable, you can enable the LDR switch to increase resource
usage.
For the MIMO, networking mode II is recommended, that is, the R99 service shares one carrier
with the MIMO service. If the frequency resource usage reaches the maximum value, the impacts
on R5 HSDPA UE is minimized.
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Chapter 6 FAQs
6.1 Services Failing to Access HSPA Channels
1. Check whether the UE supports the service.
2. Check whether the registered rate of the SIM card is correct.
3. Check whether the initial rate reaches the rate threshold of HSPA channels.
4. Run the DSP CELL command on the RNC to check whether the HSPA service of related cells
is available.
6.2 Low Download Rate of HSPA Service
1. Check whether the UE supports high-rate download.
2. Check whether transmission bandwidth is limited.
3. Check whether the index of the traffic transmitted on paths of the RNC and Node B is correct.
4. Check whether the path configuration on the RNC is consistent with that on the Node B. If the
RCR of the Node B is greater than the transmission bandwidth of the RNC, the transmission rate
is lowered due to packet loss.
Recommended relation is: Node B’s RCR=RNC’ s SCR, RNC’ s SCR=PCR-1
5. For the HSPA+ service, it is recommended to adopt IP networking and configure sufficient
bandwidth to meet high rate requirement of the HSPA+ service.
6.3 Rate of High-rate HSPA+ Service (21 Mbit/s) Being Low
Tests on a site show that the rate of the high-rate HSPA+ download service (21 Mbit/s) is in low.
Make clear that the download service is a single thread or multithread service.
Factors that affect the single thread service are as follows:
Registered rate
Size of the TCP receiving window on the PC (the size can be modified by using the
DRTCP tool)
Rate limit of the server
Packet loss on the TCP layer
Packet delivery in sequence or randomly (It is recommended that packets are delivered in
sequence on the uplink)
Rate limit on the Iu interface (check whether the bandwidth of the Iu interface on the user
plane is sufficient)
Iub flow control (it is recommended to maintain the flow control)
Bandwidth limit on the Iub interface (Check whether the bandwidth is sufficient)
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BLER of the Uu interface (Check the quality of the tested radio environment. The peak
rate of the HSPA+ service imposes high requirements on the quality of the Uu interface.
Therefore, the radio environment of the Uu interface must be high-quality.)
Great impact imposed by the CQI on the single thread service (check the quality of the
tested radio environment)
Problems occurred in the multithread service are different from those in the single thread service.
The cause may be one of the followings:
Problems occurred on the Iub interface (see the preceding configuration specifications)
*******************************************************************************
Note: For the IP networking environment, check settings of all ports to ensure that the CN and switch work in
forcible full duplex mode.
*******************************************************************************
Rate limit on the Iu interface
Poor-quality radio environment (Observing Ec/N0 on the LMT or by using other tools)
Packet loss on data sources of the CN causing insufficient data sources
The most possible cause is that the configuration of the portable computer and the driver of
the UE cause low rate in the application layer.
The recommended configuration of portable computers is as follows:
1GB memory
high-performance CPU
UE E270+ (driver of the latest version)
No packet loss in the CN High rate
High performance in the application layer on the receiving side
In conclusion, the HSPA+ imposes high requirements on each NE, portable computers, and FTP
server. Guarantee performance of the portab