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3 BSS System Information

About This Chapter

System information (SI) refers to the major radio network parameters on the Um interface suchas the network identification parameters, cell selection parameters, system control parameters,and network functional parameters.

3.1 BSS System Information TypeThe BSS system information consists of System Information Type 1 , System Information Type2, System Information Type 2bis, System Information Type 2ter, System Information Type2quater, System Information Type 3, System Information Type 4, System Information Type 5,

System Infor mation Type 5bis, System Information Type 5ter, System Information Type 6,System Infor mation Type 7, System Information Type 8, and System Informat ion Type 13.

3.2 Internal B SC Signaling Procedure of the System InformationThis describe s the internal BSC signaling procedure of the system information.

HUAWEI BSC6000 Base Station SubsystemBSS Signaling Analysis Guide 3 BSS System Information

Issue 02 (2008-01-25) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

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3.1 BSS System Information TypeThe BSS system information consists of System Information Type 1 , System Information Type2, System Information Type 2bis, System Information Type 2ter, System Information Type2quater, System Information Type 3, System Information Type 4, System Information Type 5,System Information Type 5bis, System Information Type 5ter, System Information Type 6,System Information Type 7, System Information Type 8, and System Information Type 13.

3.1.1 System Information Type 1System Information Type 1 is sent on the BCCH by the network to all the MSs within the cell.It provides information about the Random Access Channel (RACH) control and the cellallocation (CA).

3.1.2 System Information Types 2, 2bis, 2ter, and 2quater This topic describes the functions and contents of System Information Types 2, 2bis, 2ter, and2quater.

3.1.3 System Information Type 3System Information Type 3 describes the location area identification, cell identity, RACHcontrol, and p arameters of cell selection. It is mandatory and is sent on the BCCH.

3.1.4 System Information Type 4System Information Type 4 is sent on the BCCH by the network. It provides information aboutthe location a rea identification, RACH control, cell selection parameters, and available CBCHinformation.

3.1.5 System Information Types 5, 5bis, and 5ter

This topic de scribes the functions and contents of System Information Types 5, 5bis, and 5ter.3.1.6 System Information Type 6System Information Type 6 provides information about the location area identification, cellidentity, and other parameters of cell functions.

3.1.7 System Information Type 7System Infor mation Type 7 is sent on the BCCH. It provides information about cell reselection

parameters.

3.1.8 System Information Type 8System Information Type 8 is mandatory and is sent on the BCCH. It provides information aboutcell reselectio n parameters.

3.1.9 System Information Type 13System Information Type 13 is sent on the BCCH by the network. It provides information relatedto GPRS in t he cell.

3.1.1 System Information Type 1System Infor mation Type 1 is sent on the BCCH by the network to all the MSs within the cell.It provides in formation about the Random Access Channel (RACH) control and the cellallocation (C A).

3 BSS System InformationHUAWEI BSC6000 Base Station Subsystem

BSS Signaling Analysis Guide

3-2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

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Functions

System Information Type 1 is sent on the BCCH by the network to all the MSs within the cell.It provides information about the Random Access Channel (RACH) control and the cellallocation (CA).

Contents

SYS INFO 1l Cell Channel Desc.

l RACH Control Para.

l SI 1 Rest Octets.

l CA table

One cell can be configured with a maximum of 64 frequencies. The actual configuration

of cell frequencies is subject to the Table 3-1 . The BSC selects a format of cell channeldescription based on the configuration of cell frequencies.

The format of cell channel description is defined by octet 2, Format ID (Bit 128, Bit 127,Bit 124, Bit 123, and Bit 122) in the Table 3-2 .

Table 3-1 Cell channel description

8 7 6 5 4 3 2 1

Cell Channel Description IEI octet 1

Bit Bit 0 0 Bit Bit Bit Bit

octet 2128 127

Spar e

Spare 124 123 122 121

Bit Bit Bit Bit Bit Bit Bit Bitoctet 3

120 119 118 117 116 115 114 113

… … … … … … … … …

Bit Bit Bit Bit Bit Bit Bit Bitoctet 17

8 7 6 5 4 3 2 1

Table 3-2 Format of cell channel description

Bit 128 Bit 127 Bit 124 Bit 123 Bit 122 FormatNotation

0 0 X X X bit map 0

1 0 0 X X 1024 range

1 0 1 0 0 512 range

1 0 1 0 1 256 range



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Bit 128 Bit 127 Bit 124 Bit 123 Bit 122 FormatNotation

1 0 1 1 0 128 range

1 0 1 1 1 variable bitmap

Different formats of cell channel description correspond to different numbers of availablecell frequencies. Assume that the number of available frequencies for a cell is n (except for duplicate and invalid frequencies). ARFCN(i) (i=1,…,n) represents the Absolute RadioFrequency Channel Number. The numbers of available frequencies for different formatsof cell channel description are as follows:– Bit map 0

The bit map 0 format is used for GSM 900 frequencies. The number of availablefrequencies is 64 if 1 ≤ ARFCN(i) ≤ 124.

– 1024 range

If the 1024 range format is used, the number of available frequencies for a cell is equalto or smaller than 16. For a GSM 900 cell, 1 ≤ ARFCN (i) ≤ 124. For a GSM 1800cell, 512 ≤ ARFCN (i) ≤ 885.

– 512 range

If the 512 range format is used, the number of available frequencies for a cell is equalto or smaller than 18. The interval between any two frequencies must be less than 512.

– 256 range

If the 256 range format is used, the number of available frequencies for a cell is equalto or smaller than 22. The interval between any two frequencies must be less than 256.For example, in 128 range format, frequency 512 and frequency 812 cannot beconfigured together.

– 128 range

If the 128 range format is used, the number of available frequencies for a cell is equalto or smaller than 29. The interval between any two frequencies must be less than 128.For example, in 128 range format, frequency 512 and frequency 712 cannot beconfigured together.

– Variable bit map

If the variable bit map format is used, the number of available frequencies for a cell isequal to or smaller than 64. The interval between any two frequencies must be 1–111.For example, in variable bit map format, you can configure 64 frequencies numberedfrom 512 to 575 with an increment of 1. However, you cannot configure 64 frequenciesnumbered from 512 to 638 with an increment of 2.

NOTE

The early-mentioned restrictions are mainly for the GSM1800 frequencies.


The RACH control parameters include the following:– MAX retrans

Maximum number of retransmissions (Max Retrans) defines the maximum number of channel request messages that can be resent before a MS receives an immediate




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assignment message. Therefore, the number of channel request messages that an MScan send is M (Max Retrans) plus 1. The parameter has two bits, ranging from 0 to 3.The corresponding maximum numbers of retransmissions are 1, 2, 4, and 7.

– Tx_integer

Number of slots to spread transmission (Tx-integer) defines the number of timeslots between two consecutive transmissions of channel request messages.

– CELL_BAR_ACCESS

Cell Bar Access (CBA) determines whether an MS can gain access to a cell. It has onlyone bit. Value 0 of this bit means that the MS can access the cell, and value 1 of this bitmeans the MS cannot access the cell. This parameter does not affect the handover accessof the MS.

– AC CN

Access Control Class N (AC CN) defines the access class for an MS. Each class isrepresented by a bit. N = 0, 1, … 9, 11, …, 15, totally 16 bits. If the AC CN bit is 1, the

access of an MS with AC C = N is barred. Otherwise, the access of the MS with AC C= N is permitted. The MSs of classes 11–15 have a higher access priority than the MSsof classes 0–9. The MSs of classes 11-15 have the same priority. So do the MSs of classes 0–9.

– RE

Call reestabli shment all owed (RE) determines whether call reestablishment is allowedwhen call drops occur. The parameter has one bit. Value 0 means that callreestablishment is allowed in the cell. Value 1 means that call reestablishment is notallowed in the cell.

– EC

Emergency call allowed (EC) determines whether emergency calls are allowed whenthere is no SIM or the access is barred. The parameter has one bit. Value 0 means thatemergency calls are allowed in the cell to all MSs. Value 1 means that emergency callsare not allowed in the cell except for the MSs that belong to classes 11–15.

NOTE

A random value, which belongs to {S, S+1,....S+T-1}, is used as the time interval between twoconsecutive transmissions of channel request messages sent by an MS. The units of timeslotintervals are TDMA frames. "S" is subject to the configuration of common channels. "T" is Tx-integer.

Table 3-3 lists the relation between "S" and "T".

Table 3-3 Relation between "S" and "T"

Tx-Integer Non CombinedCCCH Combined CCCH

3, 8, 14, 50 55 41

4, 9, 16 76 52

5, 10, 20 109 58

6, 11, 25 163 86

7, 12, 32 217 115



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NOTE

When satellite transmission is used, Huawei recommends that Max retrans is set to 4 and Tx-integer is set to 32 to reduce the delay caused by satellite transmission.

l SI 1 Rest Octets

The SI 1 Rest Octets information element has eight bits. It contains indication informationabout the PCS 1900 and the DCS 1800 and spare bits.

3.1.2 System Information Types 2, 2bis, 2ter, and 2quaterThis topic describes the functions and contents of System Information Types 2, 2bis, 2ter, and2quater.

FunctionsSystem Information Type 2 is sent on the BCCH by the network to all MSs within the cell. It

provides information about the RACH control, NCC Permitted, and the BCCH allocation (BA1)in the neighbor cells. Generally, System Information Types 2, 2bis, and 2ter describe different

parts of the BA1 list. The MS reads and decodes the BA1 list and then performs cell reselectionin idle mode. A GSM 900 MS in PHASE 1 recognizes only the neighbor cell frequenciesdescribed in System Information Type 2 and ignores the neighbor cell frequencies described inSystem Information Types 2bis and 2ter.

System Information Type 2bis is sent optionally on the BCCH by the network to all MSs withinthe cell. It provides information about the RACH control and the extension of the BCCHallocation in the neighbor cells (part of BA1). System Information Type 2 does not describe allthe frequencies in the BA1 list. Therefore, System Information Type 2bis describes the rest of the frequencies that are on the same frequency band.

System Information Type 2ter is sent optionally on the BCCH by the network to all MSs withinthe cell. It provides information about the extension of the BCCH allocation in the neighbor cells(part of BA1). It is read only by the dual-band MSs. The GSM 900 MSs and the GSM 1800 MSsignore this message because of band difference.

System Information Type 2quater provides information about the BCCH allocation in the 3Gneighbor cells under the condition that the inter-system handover is supported and the 3Gneighbor cells are configured. It is used for the reselection of 3G cells.

Contentsl SYS INFO 2

– Neighbor Cell Desc.– NCC permitted

– RACH Control Para.l SYS INFO 2 BIS

– Neighbor Cell Desc.

– RACH Control Para.

l SYS INFO 2TER – Neighbor Cell Desc. (Extended)

l SYS INFO 2QUATER – SI 2quater Rest Octets.




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l Neighbor Cell Description (BA1)

The Neighbor Cell Description information element provides the absolute channel numbersof the BCCH carriers in the neighbor cells of the current cell. Currently, Huawei supportsa maximum of 32 neighbor cells per cell. Except for bit 5 (BA-IND) and bit 6 (EXT-IND)

of octet 2, the Neighbor Cell Description information element is coded as the Cell ChannelDescription information element. For details, refer to the cell channel description in 3.1.1System Information Type 1 .

The extension indication (EXT-IND) is sent in System Information Types 2 and 5. Itindicates whether there are extended neighbor cell frequencies sent in System InformationTypes 2bis and 5bis. If the EXT-IND bit is set to 0, System Information Types 2 and 5carry the complete BA. If the EXT-IND bit is set to 1, System Information Types 2 and 5carry only a part of the BA.

The BA indication (BA-IND) is sent in System Information Types 2 and 5. It has one bitand is used by the MS to discriminate the changes in the BA1 or the BA2. If the adjacentcell relation and the BA2 are modified during the conversation, the BA-IND bit in System

Information Type 5 should be 1, indicating that the MS should decode the neighbor cellfrequencies again. The default of the BA-IND bit is 0.l The NCC Permitted information element is sent in System Information Types 2 and 6. It

has eight bits and provides all the NCCs required by MSs. If bit N is 0 (0 ≤ N ≤ 7), theMS does not measure the power level of the cell where the NCC is N, which means thatthe MS is not handed over to the network where the NCC is N. The NCC Permittedinformation element is mainly used for handovers and cell reselection.

l For details about the RACH Control Para. information element, refer to 3.1.1 SystemInformation Type 1 .

l The Neighbor Cell Description 2 information element is sent in System Information Types2ter and 5ter. Except for bit 5 (BA-IND) and bits 6 and 7 (Multiba nd_Report ing) of octet

2, the Neighbor Cell Description 2 information element is coded as the Cell ChannelDescription i nf ormation element. For details, refer to 3.1.1 System Information Type1 . The Multiband Reporting information element is sent in System I nformation Types 2ter and 5ter. It has two bits and is used to request the dual-band MS to report information aboutneighbor cells of multiple bands. For details, refer to Table 3-4 .

Table 3-4 Multiband reporting

Multiband Reporting (2bits)

Meaning

0 The MS reports six cells where the signal strength is the

strongest, irrespective of the band used.1 The MS reports a neighbor cell that is on a different

band. It reports in the other five positions the neighbor cells that are on the same band.

10 The MS reports two neighbor cells that are on a different band. It reports in the other four positions the neighbor cells that are on the same band.

11 The MS reports three neighbor cells that are on adifferent band. It reports in the other three positions theneighbor cells that are on the same band.



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l SI 2quater Rest Octets

The SI 2quater Rest Octets information element has the following parameters:– BA_IND, 3G_BA_IND, and MP_CHANGE_MARK

– 3G Neighbor Cell Description and Index_Start_3G

– UTRAN FDD Description and UTRAN TDD Description

– 3G MEASUREMENT PARAMETERS Description

3.1.3 System Information Type 3System Information Type 3 describes the location area identification, cell identity, RACHcontrol, and parameters of cell selection. It is mandatory and is sent on the BCCH.

Functions

System Information Type 3 describes the location area identification, cell identity, RACHcontrol, and parameters of cell selection. It is mandatory and is sent on the BCCH.

Contents

SYS INFO 3l Cell Identity

l LAI

l Cell Option (BCCH)

l Cell Selection Para.

l RACH Control Para.l SI 3 Rest Octets.

l CGI

Cell Global Identification (CGI) consists of the Location Area Identification (LAI) and theCell Identity (CI). The LAI consists of the Mobile Country Code (MCC), the Mobile

Network Code (MNC), and the Location Area Code (LAC). System Information Types 3,6, and 4 contain all or part of the CGI information. Upon receiving the system information,the MS decodes the CGI. Based on the MCC and the MNC, the MS determines whether toaccess the network in the cell and whether the current location area has changed or not. If the location area has changed, the MS initiates a location update procedure.

The MCC is unique worldwide. It consists of three decimal numerals. For example, theMCC of China is 460. The MNC is unique nationwide. For example, the MNC of ChinaMobile is 00, and the MNC of China Unicom is 01. The LAC and the CI are planned byeach GSM network operator. Both the LAC and the CI have two octets. The CI ranges from0X0001 to 0XFFFE. 0X0000 and 0XFFFF are reserved.

l Control Channel Desc.

The Control Channel Description information element has the following parameters:– MSCR

The MSC Release (MSCR) parameter indicates the release of an MSC. The parameter has one bit. If the bit is 0, the MSC is released in 1998 or earlier. If it is 1, the MSC isreleased in 1999 or later.

– ATT




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The Attach-Detach Allowed (ATT) parameter indicates whether the MS is allowed toinitiate an IMSI attach and detach procedure. The ATT has one bit. If it is 0, the MS isnot allowed. If it is 1, the MS is allowed.

– CCCH-CONF

The CCCH-CONF parameter determines the combination mode of the CCCH. TheCCCH-CONF has three bits. Table 3-5 describes the meaning of the CCCH-CONF.

Table 3-5 Meaning of the CCCH-CONF

CCCH-CONF(Three Bits)

Meaning Number of CCCHMessage Blocks in OneBCCH Multiframe

0 One basic physical channelused for CCCH, not sharedwith SDCCHs

9

1 One basic physical channelused for CCCH, shared withSDCCHs

3

10 Two basic physical channelsused for CCCH, not sharedwith SDCCHs

18

100 Three basic physical channelsused for CCCH, not sharedwith SDCCHs

27

110 Four basic physical channelsused for CCCH, not sharedwith SDCCHs

36

Others Reserved -

– BS_AG_BLKS_RES

The BS_AG_BLKS_RES parameter indicates the proportion of AGCH message blocksin the CCCH message blocks. If the CCCH-CONF is 001, the BS_AG_BLKS_RESranges from 0 to 2. If the CCCH-CONF is not 001, the BS_AG_BLKS_RES rangesfrom 0 to 7. After the CCCH-CONF is set, the BS_AG_BLKS_RES is actually used todetermine the proportions of AGCHs and PCHs on the CCCH. You can modify theBS_AG_BLKS_RES to balance the loading of AGCHs and PCHs.

– BS-PA-MFRAMS

The BS-PA-MFRAMS parameter indicates the number of multiframes contained in a period for the transmission of Paging Request messages to the same paging subgroup.It actually determines the number of paging subchannels contained in the paging channelof a cell. It has three bits. The value range is 0-7, representing 2-9 multiframes periodsfor transmission of Paging Request messages to the same paging subgroup respectively.

– T3212

The timeout value of timer T3212 indicates the frequency of periodic location update.

It has eight bits. The value range is 0-255. Each unit indicates six minutes. Value 0indicates that periodic location update is not performed.



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l Cell Selection Para.

The Cell Selection Para. affect the activities of an MS after it is switched on. These parameters include the following:– Cell Reselection Hysteresis

An MS can perform cell reselection only if the difference between the signal level of the neighbor cell (in a different location area) and the C2 of the local cell is greater thanthe value of Cell Reselection Hysteresis. This parameter has three bits, ranging from 0to 7. The range of the signal level is 0-14 dB.

– MS_TXPWR_MAX_CCH

The MS_TXPWR_MAX_CCH parameter indicates the transmit power the MS may use before it recei ves the power control command. The parameter has five bits, ranging from0 to 31. Each value corresponds to the output power of an MS.

– RXLEV_ACCESS_MIN

The RXLEV_ACCESS_MIN indicates the minimum received signal level required for

the MS to access the system. It has six bits, ranging from 0 to 63. The range of the signallevel is from -110 dBm to -47 dBm.

– ACS

The ACS parameter indicates whether the MS uses C2 during cell reselection. It hasonly one bit. In System Information Type 3, this parameter is meaningless. In SystemInformation Type 4, value 0 of the bit indicates that the SI4 REST of System InformationType 4 is used to calculate the parameters related to C2. Other values indicate that theREST of System Information Types 7 and 8 are used to calculate the parameters relatedto C2.

– NECI

The NECI parameter indicates whether the current cell supports half rate services or not. It has only one bit. Value 0 of the bit indicates that the current cell does not supporthalf rate services. Value 1 of the bit indicates that the current cell supports half rateservices.


For details, refer to 3.1.1 System Information Type 1 .l SI 3 Rest Octets

The SI3 Rest Octets information element has the following parameters:– PI

This parameter indicates whether the MS uses C2 as the cell reselection parameter andwhether the parameter used to calculate C2 exists or not. It has only one bit. Value 0 of the bit indicates that the MS uses C1 as the cell reselection parameter. Value 1 of the

bit indicates that the MS uses C2 that is derived from the system information as the cellreselection parameter.

– CBQ

The Cell Bar Qualify (CBQ) parameter has only one bit. Along withCELL_BAR_ACCESS, it indicates the priority of a cell. For details, refer to Table3-6 .




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Table 3-6 Parameters affecting cell priority in cell selection

CBQ CBA Priority of CellSelection

Status of CellReselection

0 0 Normal Normal0 1 Barred Barred

1 0 Low Normal

1 1 Low Normal

– CRO

The Cell Reselect Offset (CRO) parameter applies an offset to C2. It has six bits. Therange of the signal level is 0–126 dB. Along with TO and PT, the CRO is used to regulateC2 manually.

– TO

The value range of the TEMPORARY_OFFSET (TO) parameter is 0–7. Each levelrepresents 10 dB. For example, 0 refers to 0 dB, 1 refers to 10 dB, 6 refers to 60 dB,and 7 refers to infinity.

– PT

The value range of the Penalty Time (PT) parameter is 0–31. Each level represents 20seconds. For example, 0 refers to 20 s and 30 refers to 620 s. 31 is reserved to indicatethat CRO is subtracted from C2 and that TO is ignored.

– 2TI

This 2TI parameter indicates whether System Information Type 2quater can be obtainedor not.

– ECSC

The Early Classmark Sending Control (ECS) parameter indicates whether the ECS isallowed or not.

– GPRS

This GPRS parameter indicates whether the GPRS is supported or not.– SI2quaterI

The SI2quaterI parameter indicates whether System Information Type 2quater can beobtained or not.

3.1.4 System Information Type 4System Information Type 4 is sent on the BCCH by the network. It provides information aboutthe location area identification, RACH control, cell selection parameters, and available CBCHinformation.

FunctionsSystem Information Type 4 is sent on the BCCH by the network. It provides information aboutthe location area identification, RACH control, cell selection parameters, and available CBCHinformation. The optional IEs CBCH Channel Description and CBCH Mobile Allocation are

used when the system supports cell broadcast. These IEs describe the configurations of theCBCH and the related frequency information.



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ContentsSYS INFO 4l LAI

l

Cell Selection Para.l RACH Control Para.

l CBCH Channel Desc. (optional)

l CBCH Mobile Allocation (optional)

l SI4 Rest Oct.

l LAI

For details, refer to 3.1.3 System Inf ormation Type 3 .l Cell Selection Para.

For details, refer to 3.1.3 System Inf ormation Type 3 .l RACH Control Para.

For details, refer to 3.1.2 System Inf ormation Types 2, 2bis, 2ter, and 2quater .l CBCH Channel Description and CBCH Mobile Allocation

Both CBCH Channel Description an d CBCH Mobile Allocation are optio nal. If the systemsupports cell broadcast, CBCH Channel Description indicates the configuration of theCBCH. If the CBCH is in frequency hopping mode, CBCH Mobile Allocation is mandatory.

l SI4 Rest Oct.

If the cell selection parameter ACS is set to No, the SI4 Rest Oct. is used to calculate thecell reselection parameter C2.

The criteria for cell reselection are as follows:– When PENALTY_TIME = 31, C2 = C1 - CELL_RESELECT_OFFSET

– When PENALTY_TIME is not equal to 31, C2 = C1 + CELL_RESELECT_OFFSET- TEMPORARY_OFFSET x H(PENALTY_TIME-T)

For a non-serving cell, if x < 0, H (x) = 0; if x 0, H (x) = 1. For a serving cell, H (x) =0.

The SI4 Rest Oct. information element has the following parameters:– PI

For details, refer to 3.1.3 System Information Type 3 .– CBQ

For details, refer to 3.1.3 Syst em Information Type 3 .– CRO

For details, refer to 3.1.3 System Information Type 3 .– TO

For details, refer to 3.1.3 Syst em Information Type 3 .– PT

For details, refer to 3.1.3 System Information Type 3 .

3.1.5 System Information Types 5, 5bis, and 5terThis topic describes the functions and contents of System Information Types 5, 5bis, and 5ter.




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Functions

System Information Type 5 provides the frequency information of the neighbor cells (BA2). Itis mandatory and is sent on the SACCH. Different from System Information Type 2, the MScan read the frequency information described in System Information Type 5 when it is in theconversation state and report the information about the neighbor cells in the measurement report.Such information is used for handovers. A GSM 900 MS in PHASE 1 recognizes the neighbor cell frequencies described only in Syst em Information Type 5 and ignores the neighbor cellfrequencies described in System Information Types 5bis and 5ter.

System Information Type 5bis provide s the frequency information of the n eighbor cells (part of BA2). It is optional and is sent on the SACCH. System Information Type 5 does not describeall the frequencies in the BA1 list. Therefore, System Information Type 5bis describes the restof the frequencies that are on the same frequency band.

System Information Type 5ter provides the frequency information of the neighbor cells (part of BA2). It is sent on the SACCH. Only the dual-band MSs read this message. The GSM 900 MSs

and the GSM 1800 MSs ignore this message.

ContentsSYS INFO 5- - Neighbor Cell Desc.l SYS INFO 5- - Neighbor Cell Desc.

l SYS INFO 5TER - - Neighbor Cell Desc. (Extended)

l Neighbor Cell Desc.

For details, refer to 3.1.2 System Information Types 2, 2bis, 2ter, and 2quater .l Neighbor Cell Description (Extended)

For details, refer to 3.1.2 System Information Types 2, 2bis, 2ter, and 2quater .

3.1.6 System Information Type 6System Information Type 6 provides information about the location area identification, cellidentity, and other parameters of cell functions.

FunctionsSystem Information Type 6 provides information about the location area identification, cellidentity, and other parameters of cell functions. It is mandatory and is sent on the SACCH.

ContentsSYS INFO 6l Cell Identity

l LAI

l Cell Option (BCCH)

l NCC Permitted

l CGI

For details, refer to 3.1.3 System Information Type 3 .l Cell Option

For details, refer to 3.1.3 System Information Type 3 .



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l NCC Permitted

For details, refer to 3.1.2 System Information Types 2, 2bis, 2ter, and 2quater .

3.1.7 System Information Type 7System Information Type 7 is sent on the BCCH. It provides information about cell reselection

parameters.

FunctionsSystem Information Type 7 is sent on the BCCH. It provides information about cell reselection

parameters.

ContentsSI 7 Rest Octets

The SI 7 Rest Octets information element contains the cell reselection parameters used by theMS. It may also contain the Power Offset parameter used by the DCS1800 Class 3 MS.

The coding scheme of SI 7 Rest Octets is the same as that of SI 4 Rest Octets. For details, refer to 3.1.4 System Information Type 4 .

3.1.8 System Information Type 8System Information Type 8 is mandatory and is sent on the BCCH. It provides information aboutcell reselection parameters.

FunctionsSystem Information Type 8 is mandatory and is sent on the BCCH. It provides information aboutcell reselection parameters.


The SI 8 Rest Octets information element contains the cell reselection parameters used by theMS. It may also contain the Power Offset parameter used by the DCS1800 Class 3 MS.

The coding scheme of SI 8 Rest Octets is the same as that of SI 4 Rest Octets. For details, refer to 3.1.4 System Information Type 4 .

3.1.9 System Information Type 13System Information Type 13 is sent on the BCCH by the network. It provides information relatedto GPRS in the cell.

FunctionsSystem Information Type 13 is sent on the BCCH by the network. It provides information relatedto GPRS in the cell.





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The SI 13 Rest Octets information element has the following parameters:l BCCH_CHANGE_MARK

The BCCH_CHANGE_MARK parameter has three bits. It changes according to themessages sent on the BCCH.

l SI_CHANGE_FIELD

The SI parameter is binary and indicates that the last bit of the BCCH_CHANGE_MARK parameter has changed. It has four bits and ranges from 0 to 15.

l SI13_CHANGE_MARK

The SI13_CHANGE_MARK parameter ranges from 0 to 3.l RAC

The RAC parameter is binary and indicates the routing area code. It has eight bits.l SPGC_CCCH_SUP

The SPGC_CCCH_SUP parameter indicates whether the CCCH supports the

SPLIT_PG_CYCLE parameter or not. Value 0 indicates that the CCCH does not supportSPLIT_PG_CYCLE. Value 1 indicates that the CCCH supports SPLIT_PG_CYCLE.

l PRIORITY_ACCESS_THR

The PRIORITY_ACCESS_THR parameter indicates whether packet access is supportedor not. It has three bits. Value 000 indicates that packet access is not supported. Values 001and 010 are reserved, indicating by default that packet access are not supported. Values011, 100, 101, and 110 indicate that users of priorities 1, 1 and 2, 1 to 3, and 1 to 4,respectively, support packet access. Value 111 is reserved, indicating that packet access issupported.

l NETWORK_CONTROL_ORDER

The NETWORK_CONTROL_ORDER parameter has two bits. Value 00 indicates that thecell controls cell reselection and no measurement reports are sent. Value 01 indicates thatthe cell controls cell reselection and the MS sends the measurement reports. Value 10indicates that the network controls cell reselection and the MS sends the measurementreports. Value 11 is reserved.

l PSI1_REPEAT_PERIOD

The PSI1_REPEAT_PERIOD parameter indicates the retransmit period of the PSI2. It hasfour bits. Value 0000 indicates that the retransmit period is one multiframe. Value 0001indicates that the retransmit period is two multiframes. Value 0010 indicates that theretransmit period is three multiframes. By analogy, value 1110 indicates that the retransmit

period is 15 multiframes and value 1111 indicates that the retransmit period is 16multiframes.

l System Information Type 13 also include parameters such as the GPRS Mobile Allocation,GPRS Cell Options, GPRS Power Control, Parameters struct, and PBCCH Descriptionstruct.

3.2 Internal BSC Signaling Procedure of the SystemInformation

This describes the internal BSC signaling procedure of the system information.



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System Information Type 1You can obtain the Cell Frequency in System Information Type 1 in the Cell Attributeswindow. Table 3-7 lists the RACH control parameters in System Information Type 1 and thecorresponding parameters on the BSC6000 Local Maintenance Terminal .

Table 3-7 RACH control parameters in System Information Type 1 and the corresponding parameters on the BSC6000 Local Maintenance Terminal

RACH Control Parameters inSystem Information Type 1

Parameters on the BSC6000 LocalMaintenance Terminal

Max Retrans MS MAX Retrans

Tx_interger Tx_interger

Cell Bar Access Cell_Bar_ Access

AC Common Access Control Class and SpecialAccess Control Class

RE Call Reestablishment Forbidden

EC Emergent Call Disable

To configure the parameters listed in the table on the BSC6000 Local MaintenanceTerminal , do as follows:l In the dialog box shown in Figure 3-1 , click Call Cont rol . Then set MS MAX retrans ,

Common Access Control Class , Speci al Access C ontrol Class , and Em ergent CallDisable .

l In the dialog box shown in Figure 3-1 , click Id le Mode . Set Tx-integer (RAC H Ti meslotthat equals to a TDMA frame, 4.615m s) and Cell _Bar_Access .

l In the dialog box shown in Figure 3-1 , set Call Reestablishment Forbidden .




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Figure 3-1 Set Cell Attributes dialog box

NOTE

If cell flow control is enabled, the MAX Retrans and Tx_interger parameters in System Information Type1 are automatically regulated according to the current flow control system.

System Information Types 2, 2bis, and 2terl The information on neighbor cell frequencies in System Information Types 2, 2bis, and

2ter is obtained from the 2G BA1 Table. The Ncc Permitted parameter in System

Information Type 2 is obtained from the Ncc Permitted field in the Idle Mode. The RACHControl Parameters in System Information Types 2 and 2bis are the same as that in SystemInformation Type 1. For details, see Table 3-7 .

l The information in System Information Type 2quater is obtained from the UTRAN SystemMessage, UTRAN FDD Cell BA1, and UTRAN TDD Cell BA1.

l To configure the parameters listed in the table on the BSC6000 Local MaintenanceTerminal , do as follows:– In the dialog box shown in Figure 3-1 , click Idle Mode , select Advanced , and then set

the neighbor cell frequency in 2G BA1 Table .– In the dialog box shown in Figure 3-1 , click Idle Mode . Then set NCC Permitted .



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– In the dialog box shown in Figure 3-1 , click Call Control , and then click Advanced .Then set the UTRAN system message in UTRAN System Message .

– In the dialog box shown in Figure 3-1 , click Idle Mode , and then click Advanced .Then set the UTRAN neighbor cell frequency in UTRAN FDD Cell BA1 .

– In the dialog box shown in Figure 3-1 , click Idle Mode , and then click Advanced .Then set the UTRAN neighbor cell frequency in UTRAN TDD Cell BA1 .

System Information Type 3The CGI in System Information Type 3 is obtained from the Cell Attributes window. Table3-8 lists the control channel parameters in System Information Type 3 and the corresponding

parameters on the BSC6000 Local Maintenance Termi nal .

Table 3-8 Control channel parameters in System Information Type 3 and the corresponding parameters on the BSC6000 Local Maintenance Termi nal

Control Channel Parameters inSystem Information Type 3


ATT ATT

CCCH-CONF CCCH Conf

BS_AG_BLKS_RES BS_AG_BLKS_RES

BS-PA-MFRAMS BS-PA-MFRARMS

T3212 Period of Periodic Location Update (6 minutes)

To configure the parameters listed in the table on the BSC6000 Local MaintenanceTerminal , do as follows: In the dialog box shown in Figure 3-1 , click Idle Mode . Set ATT ,CCCH-CONF , BS_AG_BLKS_RES , BS-PA-MFRAMS , and T3212 .

Table 3-9 lists the cell option parameters in System Information Type 3 and the corresponding parameters on the BSC6000 Local Maintenance Ter minal .

Table 3-9 Cell option parameters in System Information Type 3 and the corresponding parameters on the BSC6000 Local Maintenance Ter minal

Cell option parameters in SystemInformation Type 3


PWRC PWRC

DTX UL DTX

Radio Link Timeout Radio Link Timeout

To configure the parameters listed in the table on the BSC6000 Local MaintenanceTerminal , do as follows:




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l In the dialog box shown in Figure 3-1 , click Other Attributes , and then click Advanced . On the Public Channel Control tab page, set PWRC .

l In the dialog box shown in Figure 3-1 , set UL DTX .

l In the dialog box shown in Figure 3-1 , click Call Control . Set Radio Link Timeout(SACCH period (480ms)) .

Table 3-10 lists the cell option parameters in System Information Type 3 and the corresponding parameters on the BSC6000 Local Maintenance Terminal .

Table 3-10 Cell selection parameters in System Information Type 3 and the corresponding parameters on the BSC6000 Local Maintenance Terminal

Cell Selection Parameters in SystemInformation Type 3


Cell Reselection Hysteresis CRH

MS_TXPWR_MAX_CCH MS_TXPWR_MAX_CCH

RXLEV_ACCESS_MIN RXLEV_ACCESS_MIN

ACS PI

NECI Support Half Rate

To configure the parameters listed in the table on the BS C60 00 Local MaintenanceTerminal , do as follows:

l In the dialog box shown in Figure 3-1 , click Idle Mode . Set CRH and ACS .l In the dialog box shown in Figure 3-1 , click Other Attributes , select Advanced and

Common Channel Control , and then se t MS_TXP WR_MAX_CCH and Half ratesupported .

l In the dialog box shown in Figure 3-1 , set RXLEV_ACCESS_MIN .

The RACH Control Parameters information element in System Information Type 3 is the sameas that in System Information Type 1. For details, refer to Table 3-7 .

System Information Type 4The Location Area Identification in System Information Ty pe 4 is obtained from the Cell

Attributes window. For the Cell Selection Parameters, see Table 3-10 . The RACH ControlParameters information element in System Information Ty pe 4 is the same as that in SystemInformation Type 1. For details, see Table 3-7 .

Table 3-11 lists the Rest Oct parameters in System Information Type 4 and the corresponding parameters on the BSC6000 Local Maintenance Termin al .



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Table 3-11 Rest Oct parameters in System Information Type 4 and the corresponding parameterson the BSC6000 Local Maintenance Terminal

Rest Oct Parameters in SystemInformation Type 4


PI PI

CBQ Cell Bar Quality Cell_Bar_Qualify

CRO CRO (2dB)

TOTO

TO, TEMPORARY_OFFSET

PT PT (s)


l In the dialog box shown in Figure 3-1 , click Idle Mod e. Set PI , CBQ , and CRO (2 dB) .

l In the dialog box shown in Figure 3-1 , click Idle Mode , and then click Advanced . On theIdle Parameter tab page, set TO and PT .

Other System Informationl The information on neighbor cell frequencies in System Information Types 5, 5bis, and

5ter is obtained from the 2G BA2 Table, UTRAN FDD Cell BA1, and UTRAN TDD CellBA1.


– Click HO Data , and then select Advanced and 2G BA2 Table . Then set thecorresponding parameters.

– In the dialog box shown in Figure 3-1 , click HO Data , and then select Advanced andUTRAN FDD Cell BA1 . Then set th e correspo nding parameters.

– In the dialog box shown in Figure 3- 1, click HO Data , and then select Advance d andUTRAN TDD Cell BA1 . Then set the corresponding parameters.

l The CGI in System Information Type 6 is obtained from the Cell Attributes window. TheCell Options information element in System Information Type 6 is the same as that inSystem Information Type 3. For details, see Table 3-9 . The procedure for configuringNCC Permitted is the same as that for configuring NCC Permitted in System InformationType 2.

l The Rest Oct in System Information Type 7 is the same as that in System Information Type4. See Table 3-11 .

l The Rest Oct in System Information Type 8 is the same as that in System Information Type4. See Table 3-11 .

l System Information Type 13 is not processed in the BSC and is d irectly forwarded to the

BTS.



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