01-03 bss system information

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 Information Type 5bis, System Information Type 5ter, System Information Type 6,System Information Type 7, System Information Type 8, and System Information Type 13.

3.2 Internal BSC Signaling Procedure of the System InformationThis topic describes the internal BSC signaling procedure of the system information.

HUAWEI BSC6000 Base Station SubsystemSignaling Analysis Guide 3 BSS System Information

Issue 01 (2007-09-05) Huawei Technologies Proprietary 3-1

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 2quaterThis 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 parameters 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 area identification, RACH control, cell selection parameters, and available CBCHinformation.

3.1.5 System Information Types 5, 5bis, and 5terThis topic describes 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 Information Type 7 is sent on the BCCH. It provides information about cell reselectionparameters.

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

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 BSS System InformationHUAWEI BSC6000 Base Station Subsystem

Signaling Analysis Guide

3-2 Huawei Technologies Proprietary Issue 01 (2007-09-05)

FunctionsSystem 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).

ContentsSYS INFO 1l Cell Channel Desc.

l RACH Control Para.

l SI 1 Rest Octets.

l CA tableOne cell can be configured with a maximum of 64 frequencies. The actual configurationof 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 Bitoctet 2

128 127 Spare 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

1 0 1 1 0 128 range



Bit 128 Bit 127 Bit 124 Bit 123 Bit 122 FormatNotation

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 forduplicate 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 ofchannel request messages that can be resent before a MS receives an immediateassignment message. Therefore, the number of channel request messages that an MS




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

– CELL_BAR_ACCESSCell 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 CNAccess 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, theaccess 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 ofclasses 0–9.

– RECall reestablishment allowed (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.

– ECEmergency 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



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 OctetsThe 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. Itprovides 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 differentparts 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 ofthe 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.




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 SystemInformation 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. Ithas 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 (Multiband_Reporting) of octet2, the Neighbor Cell Description 2 information element is coded as the Cell ChannelDescription information element. For details, refer to 3.1.1 System Information Type1 . The Multiband Reporting information element is sent in System Information Types 2terand 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 thestrongest, irrespective of the band used.

1 The MS reports a neighbor cell that is on a differentband. It reports in the other five positions the neighborcells that are on the same band.

10 The MS reports two neighbor cells that are on a differentband. It reports in the other four positions the neighborcells 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.



l SI 2quater Rest OctetsThe 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.

FunctionsSystem 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.

ContentsSYS INFO 3l Cell Identity

l LAI

l Cell Option (BCCH)

l Cell Selection Para.


l SI 3 Rest Octets.

l CGICell Global Identification (CGI) consists of the Location Area Identification (LAI) and theCell Identity (CI). The LAI consists of the Mobile Country Code (MCC), the MobileNetwork 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. Ifthe 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 parameterhas 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




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 aperiod 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.



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

An MS can perform cell reselection only if the difference between the signal level ofthe 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_CCHThe MS_TXPWR_MAX_CCH parameter indicates the transmit power the MS may usebefore it receives 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_MINThe RXLEV_ACCESS_MIN indicates the minimum received signal level required forthe 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.

– ACSThe 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.

– NECIThe NECI parameter indicates whether the current cell supports half rate services ornot. 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.

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

l SI 3 Rest OctetsThe 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 ofthe bit indicates that the MS uses C1 as the cell reselection parameter. Value 1 of thebit indicates that the MS uses C2 that is derived from the system information as the cellreselection parameter.

– CBQThe 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.




Table 3-6 Parameters affecting cell priority in cell selection

CBQ CBA Priority of CellSelection

Status of CellReselection

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



ContentsSYS INFO 4l LAI

l Cell Selection Para.


l CBCH Channel Desc. (optional)

l CBCH Mobile Allocation (optional)

l SI4 Rest Oct.

l LAIFor details, refer to 3.1.3 System Information Type 3 .

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

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

l CBCH Channel Description and CBCH Mobile AllocationBoth CBCH Channel Description and CBCH Mobile Allocation are optional. 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 System Information Type 3 .– CRO

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

For details, refer to 3.1.3 System 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.




FunctionsSystem 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 neighborcell frequencies described only in System Information Type 5 and ignores the neighbor cellfrequencies described in System Information Types 5bis and 5ter.

System Information Type 5bis provides the frequency information of the neighbor cells (part ofBA2). 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 ofBA2). It is sent on the SACCH. Only the dual-band MSs read this message. The GSM 900 MSsand 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 CGIFor details, refer to 3.1.3 System Information Type 3 .

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



l NCC PermittedFor 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 reselectionparameters.

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

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, referto 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, referto 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.





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

l SI13_CHANGE_MARKThe SI13_CHANGE_MARK parameter ranges from 0 to 3.

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

l SPGC_CCCH_SUPThe SPGC_CCCH_SUP parameter indicates whether the CCCH supports theSPLIT_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_THRThe 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_ORDERThe 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_PERIODThe 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 retransmitperiod 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 topic describes the internal BSC signaling procedure of the system information.



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 LMT.

Table 3-7 RACH control parameters in System Information Type 1 and the correspondingparameters on the LMT

RACH Control Parameters inSystem 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 andthe special access control class

RE Call re-establishment allowed

EC EC allowed

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

l In the dialog box shown in Figure 3-1, click Idle Mode. Set the Tx_interger and CBAparameters.

l In the dialog box shown in Figure 3-1, set the Call re-establishment allowed parameter.




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 Type1 are automatically regulated according to the current flow control system.

System Information Types 2, 2bis, and 2terl 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 SystemInformation Type 2 is obtained from the NCC permitted field in the system informationtable. The RACH Control Parameters in System Information Types 2 and 2bis are the sameas that in System Information Type 1. For details, see Table 3-7.

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

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

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



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

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

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

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 correspondingparameters on the LMT.

Table 3-8 Control channel parameters in System Information Type 3 and the correspondingparameters on the LMT

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-MFRAMS

T3212 T3212

To configure the parameters listed in the table, do as follows: In the dialog box shown in Figure3-1, click Idle Mode. Set the ATT, CCCH-CONF, BS_AG_BLKS_RES, BS-PA-MFRAMS, and T3212 parameters.

Table 3-9 lists the cell option parameters in System Information Type 3 and the correspondingparameters on the LMT.

Table 3-9 Cell option parameters in System Information Type 3 and the correspondingparameters on the LMT

Cell selection parameters inSystem Information Type 3


PWRC PWRC

DTX DTX

Radio Link Timeout Radio Link Timeout

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

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

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




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 thecorresponding parameters on the LMT.

Table 3-10 Cell selection parameters in System Information Type 3 and the correspondingparameters on the LMT

Cell Selection Parameters in SystemInformation Type 3


Cell Reselection HysteresisCRH

Cell Reselection Hysteresis

MS_TXPWR_MAX_CCH MS_TXPWR_MAX_CCH

RXLEV_ACCESS_MIN RXLEV_ACCESS_MIN

ACS PI

NECI Half rate supported

To configure the parameters listed in the table, do as follows:l In the dialog box shown in Figure 3-1, click Idle Mode. Set the CRH and the ACS

parameters.l In the dialog box shown in Figure 3-1, click Other Attributes, select > Advanced and

> Common Channel Control, and then set the > MS_TXPWR_MAX_CCH and the >Half rate supported parameters.

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 Type 4 is obtained from the CellAttributes window. For the Cell Selection Parameters, see . The RACH Control Parametersinformation element in System Information Type 4 is the same as that in SystemInformation Type 1. For details, see .

Table 3-11 lists the Rest Oct parameters in System Information Type 4 and the correspondingparameters on the LMT.

Table 3-11 Rest Oct parameters in System Information Type 4 and the corresponding parameterson the LMT

Rest Oct Parameters in SystemInformation Type 4


PI PI

CBQCBQ

CBQ, Cell Bar Qualify



Rest Oct Parameters in SystemInformation Type 4


CRO CRO (2 dB)

TOTO

TO, TEMPORARY_OFFSET

PT PT

To configure the parameters listed in the table, do as follows:l In the dialog box shown in Figure 3-1, click Idle Mode. Set the PI, CBQ, and CRO (2

dB) parameters.l 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 Informationl 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:– Click HO Data, select > Advanced and > 2G BA2 Table . Then set the corresponding

parameters.– In the dialog box shown in Figure 3-1, click HO Data, select > Advanced and > 3G

BA2 Table . Then set the corresponding parameters.l 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 same as that inSystem Information Type 3. For details, see Table 3-9. The NCC Permitted is obtainedfrom the NCC Permitted information element in System Information Type 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 directly forwarded to theBTS.




01-03 bss system information

Documents

dialog box shown

basic physical channel

periodic location update

huawei technologies proprietary

basic physical channels

location area identification

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channel request messages