01-03 BSS System Information

HUAWEI BSC6000 Base Station Subsystem Signaling Analysis Guide

3 BSS System Information

3

BSS System Information

About This Chapter System information (SI) refers to the major radio network parameters on the Um interface such as the network identification parameters, cell selection parameters, system control parameters, and network functional parameters. 3.1 BSS System Information Type The BSS system information consists of System Information Type 1 , System Information Type 2, System Information Type 2bis, System Information Type 2ter, System Information Type 2quater, System Information Type 3, System Information Type 4, System Information Type 5, System Infor mation mation Type 5bis, System Information Type 5ter, System Information Type 6, System Infor mation mation Type 7, System Information Type 8, and System Information Informat ion Type 13. 3.2 Internal BSC BSC Signaling Procedure of the System Information This topic describes describes the internal BSC signaling procedure of the system information.

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Huawei Technologies Proprietary

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3.1 BSS System Information Type The BSS system information consists of System Information Type 1 , System Information Type 2, System Information Type 2bis, System Information Type 2ter, System Information Type 2quater, 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 1 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 cell allocation (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, and 2quater. 3.1.3 System Information Type 3 System Information Type 3 describes the location area identification, cell identity, RACH control, and parameters parameters of cell selection. It is mandatory and is sent on the BCCH. 3.1.4 System Information Type 4 System Information Type 4 is sent on the BCCH by the network. It provides information about the location area area identification, RACH control, cell selection parameters, and available CBCH information. 3.1.5 System Information Types 5, 5bis, and 5ter This topic describes describes the functions and contents of System Information Types 5, 5bis, and 5ter. 3.1.6 System Information Type 6 System Information Type 6 provides information about the location area identification, cell identity, and other parameters of cell functions. 3.1.7 System Information Type 7 System Infor mation mation Type 7 is sent on the BCCH. It provides information about cell reselection parameters. 3.1.8 System Information Type 8 System Information Type 8 is mandatory and is sent on the BCCH. It provides information about cell reselection reselection parameters. 3.1.9 System Information Type 13 System Information Type 13 is sent on the BCCH by the network. It provides information related to GPRS in the the cell.

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

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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 cell allocation (CA).

Contents SYS INFO 1 l

Cell Channel Desc.

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RACH Control Para.

l

SI 1 Rest Octets.

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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 channel description 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 Bit

0

Bit

Bit

octet 1

Bi t

0

Bit

Bit

128

127

Spar e

Spare

124

123

122

121

Bit

Bi t

Bit

Bit

Bit

Bit

Bit

Bit

120

119

118

117

116

115

114

113

…

…

…

…

…

…

…

…

Bit

Bi t

Bit

Bit

Bit

Bit

Bit

Bit

8

7

6

5

4

3

2

1

octet 2

octet 3 …

octet 17

Table 3-2 Format of cell channel description

Bit 128

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Bit 127

Bit 124

Bit 123

Bit 122

Format Notation

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

1

0

1

1

0

128 range


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Bit 128

Bit 127

1

0

Bit 124

Bit 123

Bit 122

1

1

1

Format Notation variable bit map

Different formats of cell channel description correspond to different numbers of available cell 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 Radio Frequency Channel Number. The numbers of available frequencies for different formats of cell channel description are as follows: –

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

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

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

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256 range If the 256 range format is used, the number of available frequencies for a cell is equal to 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 be configured together.

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128 range If the 128 range format is used, the number of available frequencies for a cell is equal to 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 be configured together.

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Variable bit map If the variable bit map format is used, the number of available frequencies for a cell is equal 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 numbered from 512 to 575 with an increment of 1. However, you cannot configure 64 frequencies numbered from 512 to 638 with an increment of 2. NOTE

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

RACH Control Para. 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 assignment message. Therefore, the number of channel request messages that an MS

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

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

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AC CN Access Control Class N (AC CN) defines the access class for an MS. Each class is represented 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 MSs of classes 0–9. The MSs of classes 11-15 have the same priority. So do the MSs of classes 0–9.

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RE Call reestablishment allowed (RE) determines whether call reestablishment is allowed when call drops occur. The parameter has one bit. Value 0 means that call reestablishment is allowed in the cell. Value 1 means that call reestablishment is not allowed in the cell.

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EC Emergency call allowed (EC) determines whether emergency calls are allowed when there is no SIM or the access is barred. The parameter has one bit. Value 0 means that emergency calls are allowed in the cell to all MSs. Value 1 means that emergency calls are 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 two consecutive transmissions of channel request messages sent by an MS. The units of timeslot intervals are TDMA frames. "S" is subject to the configuration of common channels. "T" is Txinteger.

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

Tx-Integer

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Non Combined CCCH

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 Txinteger 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 information about the PCS 1900 and the DCS 1800 and spare bits.

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, and 2quater.

Functions System 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 decodes the BA1 BA1 list and then performs performs cell reselection in idle mode. A GSM 900 MS in PHASE 1 recognizes only the neighbor cell frequencies described in System Information Type 2 and ignores the neighbor cell frequencies described in System Information Types 2bis and 2ter. System Information Type 2bis is sent optionally on the BCCH by the network to all MSs within the cell. It provides information about the RACH control and the extension of the BCCH allocation in the neighbor cells (part of BA1). System Information Type 2 does not describe all the 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 within the 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 MSs ignore this message because of band difference. System Information Type 2quater provides information about the BCCH allocation in the 3G neighbor cells under the condition that the inter-system handover is supported and the 3G neighbor cells are configured. It is used for the reselection of 3G cells.

Contents l

SYS INFO 2 –

Neighbor Cell Desc.

–

NCC permitted

– l

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SYS INFO 2 BIS –

Neighbor Cell Desc.

–

RACH Control Para.

SYS INFO 2TER –

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Neighbor Cell Desc. (Extended)

SYS INFO 2QUATER –

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RACH Control Para.

SI 2quater Rest Octets. Huawei Technologies Proprietary

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HUAWEI BSC6000 Base Station Subsystem Signaling Analysis Guide l


Neighbor Cell Description (BA1) The Neighbor Cell Description information element provides the absolute channel numbers of the BCCH carriers in the neighbor cells of the current cell. Currently, Huawei supports a 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 Channel Description information element. For details, refer to the cell channel description in 3.1.1 System Information Type 1 . The extension indication (EXT-IND) is sent in System Information Types 2 and 5. It indicates whether there are extended neighbor cell frequencies sent in System Information Types 2bis and 5bis. If the EXT-IND bit is set to 0, System Information Types 2 and 5 carry the complete BA. If the EXT-IND bit is set to 1, System Information Types 2 and 5 carry only a part of the BA. The BA indication (BA-IND) is sent in System Information Types 2 and 5. It has one bit and is used by the MS to discriminate the changes in the BA1 or the BA2. If the adjacent cell 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 cell frequencies again. The default of the BA-IND bit is 0.

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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), the MS does not measure the power level of the cell where the NCC is N, which means that the MS is not handed over to the network where the NCC is N. The NCC Permitted information element is mainly used for handovers and cell reselection.

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

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The Neighbor Cell Description 2 information element is sent in System Sys tem Infor mation mation Types 2ter and 5ter. Except for bit 5 (BA-IND) and bits 6 and 7 (Multiband_Reporting) of octet 2, the Neighbor Neighbor Cell Cell Description 2 information element is coded as the Cell Channel Description information element. For details, refer to 3.1.1 System Information Type 1 . The Multiband Reporting information element is sent in System Information Types 2ter and 5ter. It has two bits and is used to request the dual-band MS to report information about neighbor cells of multiple bands. For details, refer to Table 3-4. Table 3-4 Multiband reporting

Multiband Reporting (2 bits)

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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 other five positions the neighbor 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 other four positions the neighbor neighbor cells that are on the same band.

11

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


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


Cell Identity

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LAI

l

Cell Option (BCCH)

l

Cell Selection Para.

l

RACH Control Para.

l

SI 3 Rest Octets.

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CGI Cell Global Identification (CGI) consists of the Location Area Identification (LAI) and the Cell Identity (CI). The LAI consists of the Mobile Country Code (MCC), the Mobile Network Code (MNC), (MNC), and the Location Area Code (LAC). System System Information Types 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 to access 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, the MCC of China is 460. The MNC is unique nationwide. For example, the MNC of China Mobile is 00, and the MNC of China Unicom is 01. The LAC and the CI are planned by each GSM network operator. Both the LAC and the CI have two octets. The CI ranges from 0X0001 to 0XFFFE. 0X0000 and 0XFFFF are reserved.

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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 is released in 1999 or later.

–

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ATT Huawei Technologies Proprietary

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The Attach-Detach Allowed (ATT) parameter indicates whether the MS is allowed to initiate an IMSI attach and detach procedure. procedure. The ATT has one bit. If it is 0, the MS is not allowed. If it is 1, the MS is allowed. –

CCCH-CONF The CCCH-CONF parameter determines the combination mode of the CCCH. The CCCH-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)

Number of CCCH Message Blocks in One BCCH Multiframe

0

One basic physical channel used for CCCH, not shared with SDCCHs

9

1

One basic physical channel used for CCCH, shared with SDCCHs

3

10

Two basic physical channels used for CCCH, not shared with SDCCHs

18

100

Three basic physical channels used for CCCH, not shared with SDCCHs

27

110

Four basic physical channels used for CCCH, not shared with SDCCHs

36

Others –

Meaning

Reserved

-

BS_AG_BLKS_RES The BS_AG_BLKS_RES parameter indicates the proportion of AGCH message blocks in the CCCH message blocks. If the CCCH-CONF is 001, the BS_AG_BLKS_RES ranges from 0 to 2. If the CCCH-CONF is not 001, the BS_AG_BLKS_RES ranges ranges from 0 to 7. After the CCCH-CONF is set, the BS_AG_BLKS_RES is actually used to determine the proportions of AGCHs and PCHs on the CCCH. You can modify the BS_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 transmission of Paging Request messages messages to the same paging paging subgroup. It actually determines the number of paging subchannels contained in the paging channel of a cell. It has three bits. The value range is 0-7, representing 2-9 multiframes periods for 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 0 indicates that periodic location update is not performed.

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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 than the value of Cell R eselection Hysteresis. This parameter has three bits, ranging from 0 to 7. The range of the signal level is 0-14 dB.

–

MS_TXPWR_MAX_CCH The MS_TXPWR_MAX_CCH parameter parameter indicates the transmit power the MS may use before it receives receives the power control command. The parameter has five bits, ranging from 0 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 signal level is from -110 dBm to -47 dBm.

–

ACS The ACS parameter indicates whether the MS uses C2 during cell reselection. It has only one bit. In System Information Type 3, this parameter is meaningless. In System Information Type 4, value 0 of the bit indicates that the SI4 REST of System Information Type 4 is used to calculate the parameters related to C2. Other values indicate that the REST of System Information Types 7 and 8 are used to calculate the parameters related to 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 support half rate services. Value 1 of the bit indicates that the current cell supports half rate services.

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RACH Control Para. For details, refer to 3.1.1 System Information Type 1 .

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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 and whether 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 information as the cell reselection parameter.

–

CBQ The Cell Bar Qualify (CBQ) parameter has only one bit. Along with CELL_BAR_ACCESS, it indicates the priority of a cell. For details, refer to Table 3-6.

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Table 3-6 Parameters affecting cell priority in cell selection

CBQ

–

CBA

Priority of Cell Selection

Status of Cell Reselection

0

0

Normal

Normal

0

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. The range of the signal level is 0–126 dB. Along with TO and PT, the CRO is used to regulate C2 manually.

–

TO The value range of the TEMPORARY_OFFSET TEMPORARY_OFFSET (TO) parameter is 0–7. Each level represents 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 20 seconds. For example, 0 refers to 20 s and 30 refers to 620 s. 31 is reserved to indicate that CRO is subtracted from C2 and that TO is ignored.

–

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

–

ECSC The Early Classmark Sending Control (ECS) parameter indicates whether the ECS is allowed 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 be obtained or not.

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

Functions System Information Type 4 is sent on the BCCH by the network. It provides information about the location area identification, RACH control, cell selection parameters, and available CBCH information. The optional IEs CBCH Channel Description and CBCH Mobile Allocation are used when the system supports cell broadcast. These IEs describe the configurations of the CBCH and the related frequency information. Issue 01 (2007-09-05)


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LAI

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Cell Selection Para.

l

RACH Control Para.

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CBCH Channel Desc. (optional)

l

CBCH Mobile Allocation (optional)

l

SI4 Rest Oct.

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LAI ormation Type 3 . For details, refer to 3.1.3 System Inf ormation

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

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RACH Control Para. ormation Types 2, 2bis, 2ter, and 2quater . For details, refer to 3.1.2 System Inf ormation

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CBCH Channel Description and CBCH Mobile Allocation Both CBCH Channel Description and and CBCH Mobile Allocation are optional. optional. If the system supports cell broadcast, CBCH Channel Description indicates the configuration of the CBCH. If the CBCH is in frequency hopping mode, CBCH Mobile Allocation is mandatory.

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SI4 Rest Oct. If the cell selection parameter ACS is set to No, the SI4 Rest Oct. is used to calculate the cell reselection parameter C2. The criteria for cell reselection are as follows: –

When PENALTY_TIME = 31, C2 = C1 - CELL_RESELECT_OF CELL_RESELECT_OFFSET FSET

–

When PENALTY_TIME is not equal to 31, C2 = C1 + CELL_RESELECT_OFFSET - TEMPORARY_OFFSET x H(PENALTY_TIME-T) 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 System System Information Type 3 .

–

CRO For details, refer to 3.1.3 System Information Type 3 .

–

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

–

PT For details, refer to 3.1.3 System Information Type 3 .

3.1.5 System Information Types 5, 5bis, and 5ter This topic describes the functions and contents of System Information Types 5, 5bis, and 5ter. 3-12


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Functions System Information Type 5 provides the frequency information of the neighbor cells (BA2). It is mandatory and is sent on the SACCH. Different from System Information Type 2, the MS can read the frequency information described in System Information Type 5 when it is in the conversation 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 cell frequencies described in System Information Types 5bis and 5ter. System Information Type 5bis provides provides 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 describe all the frequencies in the BA1 list. Therefore, System Information Type 5bis describes the rest of 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.

Contents SYS INFO 5- - Neighbor Cell Desc. l

SYS INFO 5- - Neighbor Cell Desc.

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

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

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

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


Cell Identity

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LAI

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Cell Option (BCCH)

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NCC Permitted CGI For details, refer to 3.1.3 System Information Type 3 .

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

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

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

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

Contents SI 7 Rest Octets The SI 7 Rest Octets information element contains the cell reselection parameters parameters used by the MS. 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 8 System Information Type 8 is mandatory and is sent on the BCCH. It provides information about cell reselection parameters.

Functions System Information Type 8 is mandatory and is sent on the BCCH. It provides information about cell reselection parameters.

Contents SI 8 Rest Octets The SI 8 Rest Octets information element contains the cell reselection parameters parameters used by the MS. 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 13 System Information Type 13 is sent on the BCCH by the network. It provides information related to GPRS in the cell.

Functions System Information Type 13 is sent on the BCCH by the network. It provides information related to GPRS in the cell.

Contents SI 13 Rest Octets 3-14


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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 the messages sent on the BCCH.

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

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SI13_CHANGE_MARK The SI13_CHANGE_MARK parameter ranges from 0 to 3.

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

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SPGC_CCCH_SUP The SPGC_CCCH_SUP parameter indicates whether the CCCH supports the SPLIT_PG_CYCLE parameter parameter or not. Value 0 indicates that the CCCH does not support SPLIT_PG_CYCLE. Value 1 indicates that the CCCH supports SPLIT_PG_CYCLE.

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PRIORITY_ACCESS_THR The PRIORITY_ACCESS_THR parameter indicates whether packet access is supported or not. It has three bits. Value 000 indicates that packet access is not supported. Values 001 and 010 are reserved, indicating by default that packet access are not supported. Values 011, 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 is supported.

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

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PSI1_REPEAT_PERIOD The PSI1_REPEAT_PERIOD PSI1_REPEAT_PERIOD parameter indicates the retransmit period of the PSI2. It has four bits. Value 0000 indicates that the retransmit period is one multiframe. Value 0001 indicates that the retransmit period is two multiframes. Value 0010 indicates that the retransmit period is three multiframes. By analogy, value 1110 indicates that the retransmit period is 15 multiframes and and value 1111 indicates that that the retransmit period is 16 multiframes.

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

3.2 Internal BSC Signaling Procedure of the System Information This topic describes the internal BSC signaling procedure of the system i nformation.

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System Information Type 1 You can obtain the Cell Frequency in System Information Type 1 in the Cell Attributes window. Table 3-7 lists the RACH control parameters in System Information Type 1 and the corresponding parameters on the LMT. Table 3-7 RACH control parameters in System Information Type 1 and the corresponding parameters on the LMT LMT

RACH Control Parameters in System Information Type 1

Parameters on the LMT

Max Retrans

MS MAX retrans

Tx_interger

Tx_interger

Cell Bar Access

CBA

AC

Controlled by the common access control class and the special access control class

RE

Call re-establishment allowed

EC

EC allowed

To configure the parameters listed in the table, do as follows: l

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In the dialog box shown in Figure 3-1, click Call Control. Then set the MS MAX retrans, Common Access Control Class, Special Access Control Class, and EC allowed parameters. Mode. Set the Tx_interger and CBA In the dialog box shown in Figure 3-1, click click Idle Mode parameters. re-establishment allowed parameter. In the dialog box shown in Figure 3-1, set set the Call re-establishment


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Figure 3-1 Setting Cell Attributes dialog box

NOTE

If cell flow control is enabled, the MAX Retrans and Tx_interger parameters in System Information Type 1 are automatically regulated according to the current flow control system.

System Information Types 2, 2bis, and 2ter l

The information about neighbor cell frequencies in System Information Types 2, 2bis, and 2ter is obtained from the BA1 (BCCH) table. The NCC Permitted parameter in System Information Type 2 is obtained from the NCC permitted field in the system information table. The RACH Control Parameters in System Information Types 2 and 2bis are the same as that in System Information Type 1. For details, see Table 3-7.

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The information in System Information Type 2quater is obtained from the 3G system information table and the 3G BA1 table.

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To configure the parameters listed in the table, do as follows: –

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In the dialog box shown in Figure 3-1, click Idle Mode, select > Advanced , and then set the neighbor neighbor cell frequency frequency in > 2G BA1 Table .


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3 BSS System Information –

In the dialog box shown in Figure 3-1, click Idle Mode. Then set the NCC Permitted parameter.

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In the dialog box shown in Figure 3-1, click Call Control, select > Advanced , and then set the 3G system information information in > 3G System Information .

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In the dialog box shown in Figure 3-1, click Idle Mode, select > Advanced , and then set the neighbor neighbor cell frequency frequency in > 3G BA1 Table .

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

Control Channel Parameters in System Information Type 3


ATT

ATT

CCCH-CONF

CCCH-CONF

BS_AG_BLKS_RES

BS_AG_BLKS_RES

BS-PA-MFRAMS

BS-PA-MFRAMS

T3212

T3212

To configure the parameters listed in the table, do as follows: In the dialog box shown in Figure 3-1, click Idle Mode. Set the ATT, CCCH-CONF , BS_AG_BLKS_RES , BS-PAMFRAMS, and T3212 parameters. Table 3-9 lists the cell option parameters in System Information Type 3 and the corresponding parameters on the LMT. LMT. Table 3-9 Cell option parameters in System Information Type 3 and the corresponding parameters on the LMT LMT

Cell selection parameters in System Information Type 3


PWRC

PWRC

DTX

DTX

Radio Link Timeout

Radio Link Timeout

To configure the parameters listed in the table, do as follows:

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In the dialog box shown in Figure 3-1, click Other Attributes , select > Advanced and > Common Channel Control, and then set set > PWRC .

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In the dialog box shown in Figure 3-1, set DTX. Huawei Technologies Proprietary

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HUAWEI BSC6000 Base Station Subsystem Signaling Analysis Guide l


In the dialog box shown in Figure 3-1, click Call Control. Set Radio Link Timeout.

Table 3-10 lists the cell selection parameters in System Information Type 3 and the corresponding parameters on the LMT. Table 3-10 Cell selection parameters in System Information Type 3 and the corresponding parameters on the LMT LMT

Cell Selection Parameters in System Information Type 3


Cell Reselection Hysteresis CRH Cell Reselection Hysteresis MS_TXPWR_MAX_CCH

MS_TXPWR_MAX_CCH

RXLEV_ACCESS_MIN

RXLEV_ACCESS_MIN

ACS

PI

NECI

Half rate supported supported


In the dialog box shown in Figure 3-1, click Idle Mode. Set the CRH and the ACS parameters.

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In the dialog box shown in Figure 3-1, click Other Attributes , select > Advanced and > Common Channel Control, and then then set the > MS_TXPWR_MAX_CCH and the > Half rate supported parameters.

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

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

System Information Type 4 The Location Area Identification in System Information Type 4 is obtained from the Cell Attributes window. For the Cell Selection Par ameters, ameters, see see . The RACH Control Parameters information element in System Information Type 4 is the same as that in System Information Type 1. For details, see . Table 3-11 lists the Rest Oct parameters in System Information Type 4 and the corresponding parameters on the LMT. LMT. Table 3-11 Rest Oct parameters in System Information Type 4 and the corresponding parameters on the LMT

Rest Oct Parameters in System Information Type 4


PI

PI

CBQ CBQ CBQ, Cell Bar Qualify

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Rest Oct Parameters in System Information Type 4


CRO

CRO (2 dB)

TO TO TO, TEMPORARY_OFFSET TEMPORARY_OFFSET PT

PT


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

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In the dialog box shown in Figure 3-1, click Idle Mode, select > Advanced and > Idle Parameters, and then set the > TO and the > PT parameters.

Other System Information l

The information about neighbor cell frequencies in System Information Types 5, 5bis, and 5ter is obtained from the 2G BA1 Table and the 3G BA2 Table. To configure the parameters listed in the table, do as follows:

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Advanced and > 2G BA2 Table . Then set the corresponding Click HO Data, select > Advanced parameters.

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In the dialog box shown in Figure 3-1, click HO Data, select > Advanced and > 3G BA2 Table . Then set the corresponding parameters.

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The CGI in System Information Type 6 is obtained from the Cell Attributes window. The Cell Options information element in System Information Type 6 is the the same as that in System Information Type 3. For details, see Table 3-9. The NCC Permitted is obtained from the NCC Permitted information element in System Information Type 2. 

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The Rest Oct in System Information Type 7 is the same as that in System Information Type 4. See Table 3-11.

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The Rest Oct in System Information Type 8 is the same as that in System Information Type 4. See Table 3-11.

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System Information Type 13 is not processed in the BSC and is directly forwarded to the BTS.


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01-03 BSS System Information

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