Security Level:
2008-11-3
System Information
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Content • System information
Overview
SI 1
SI 2
SI 3
SI 4
SI 5
SI 6
SI13
Summary
Overview
System information (SYS INFO) is the message sent by the network to all mobile stations through Um interface
Direction:
network to mobile station
So SYS INFO guide MS and control downlink.
On OMC
System information appears in system information table
On DT
SYS INFO can be divided into two parts
SYS INFO sent on BCCH - SYS INFO 1, 2, 2BIS, 2TER, 3, and 4, which are used by MS in idle mode.
SYS INFO sent on SACCH - SYS INFO 5, 5BIS, 5TER, and 6, which are used by MS in dedicated mode.
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BCCH of the cell MS listen to
CA table – cell allocation 1. Available frequencies 2. At most 64 frequencies
•CBQ •CBA
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Cell priority
BA1 table - BCCH Allocation
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1.
All neighbor cell’s BCCHs
2.
Used for cell selection and reselection
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NCC that need be measured by MS.
Mostly used in handover
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CGI=MCC+MNC+LAC+CI Related paging
Related Call drop HUAWEI TECHNOLOGIES CO., LTD.
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Related to GPRS
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Summary System information
Item SI 1
SI 2
SI 3
SI 4
BCCH of current cell
★
★
★
★
CBA&CBQ
★
★
★
★
MS MAX Retrans&TX-Integer
★
★
★
★
BCCH of neighbor cell
★
NCC permitted
★
SI 6
★ ★
CGI
★
★
CRO&CRH
★
★
Radio Link Timeout
★
Half rate
★
DTX
★
RXLEV_ACCESS_MIN
★
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★
★ ★ ★ ★
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RACH MS
BTS Channel_req
BSC Channel_Required Channel_Active Channel_Active_Ack
IMMEDIATE ASSIGN COMMAND
RACH → ALOH → Collision → LOST → Retransmission → Access probability How many times can MS send channel request? MS MAX retrans How long is it between two transmission? Tx_interger HUAWEI TECHNOLOGIES CO., LTD.
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MS MAX Retrans
Value range: 1, 2, 4, 7
Unit: Time
Content: MS MAX Retrans is the upper limit of times that MS is allowed to send “Channel Request” in one immediate assignment procedure.
Recommendation:
Set to 7 for areas with low traffic (suburban or rural area) and the cell radius more than 3 km.
Set to 4 for areas with ordinary traffic (non-busy area in the city) and the cell radius is less than 3km.
Set to 2 for micro-cell
Set to 1 for micro-cell with heavy traffic or with obvious congestion.
Set to 4 or 7 for satellite transmission BTS.
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TX-Integer
Value range: 3~12, 14, 16, 20, 25, 32, 50
Unit: RACH timeslot (equals to a TDMA frame, 4.615ms)
Content: Used to calculate the number of timeslots in the interval between multiple channel requests sent by MS.
Recommendation: 20 (If the cell immediate assignment success rate is low, set the S with a larger value. Select 32 for satellite transmission, so as to reduce satellite transmission delay).
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Calculation of S
• The number of slots (not including slots for sending messages) between originating immediate assignment process and sending the first channel request messages is random. Its range is {0, 1, …, MAX (T, 8) - 1} •The number of slots (not including slots for sending messages) between a channel request message and the next is random. Its range is {S, S + 1, …, S + T - 1}
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CGI and BSIC
Network identity parameters mainly include
Cell global identity (CGI)
Base station identity code (BSIC)
CGI=MCC+MNC+LAC+CI (Unique)
Decides whether to camp the cell according to MCC and MNC Judges whether to execute location update based on LAI
BSIC=NCC+BCC (Not Unique)
Identify two cells with the same BCCH by the help of BSIC FCCH
Idle mode
SCH BCCH
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Measurement report
BCCH BSIC
In a call
…. BCCH BSIC
.…
CGI
Handover command
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Co-BCCH and co-BSIC in adjacent area Neighbor list
BSIC: 12 Cell B: BCCH 97
m
Cell A
ov in g
Serving cell
Neighbor
Cell A
Cell B
Cell A
….
BSIC: 12 to
Cell C: BCCH 97
BSIC: 13 HUAWEI TECHNOLOGIES CO., LTD.
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RXLEV_ACCESS_MIN
Value range: 0~63
Unit: Level
Content: It means the minimum receive signal level required for MS to access a cell.
Recommendation: 8
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Access
RACH min. access level
Range： ：0-5 (corresponding to -110--105dBm) Unit： ：Grade Default： ：1 Description:The "RACH minimum access level" will affect MS access. This parameter indicates the threshold level at which the system determines MS random access. Only when the level on RACH exceeds this threshold will BTS regard the access to be successful. When the level of the received RACH burst is smaller than the threshold, BTS regards the access is invalid. To avoid MS being unable to set up call even it is in the coverage area, consideration should be given to BTS sensitivity and MS RXLEV_ACCESS_MIN during the setting of this parameter.
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Access
Random access error Thrsh Random access error Thrsh
Number of right bits in TSC
90–100
33
101–120
34
121–140
35
141–160
36
161–175
37
176–195
38
196–221
39
222–243
40
244–250
41
0–89 or 251–255
38
The value ranges from 0 to 255. The recommended value is 180. HUAWEI TECHNOLOGIES CO., LTD.
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Max TA
Range:
0~63 (Normal cell and single TS extended cell).
0~255 (Dual TS extended cell).
Unit: bit period (1 bit = 0.55km)
Default:
62 for normal cell,
63 for single TS extended cell,
219 for dual TS extended cell.
Description: Maximum Time Advance. It determines the actual coverage area of BTS. When BTS receives the channel request message, it determines whether channel assignment should take place in the current cell by comparing the TA with the value of this parameter. HUAWEI TECHNOLOGIES CO., LTD.
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Call drop
Radio Link Timeout
Value range: 4~64, the step size is 4
Unit: SACCH period (480ms)
Content: This parameter is used for MS to decide down-link disconnection in case of SACCH decoding failures.
Recommendation: 20~56
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Call drop
SACCH Multi-Frames (SACCH period(480ms))
Range:0~63
Unit: SACCH period (480ms)
Default:14
Description: It is a timer used to determine whether the uplink radio link connection fails. BSS judges the uplink radio link failure according to uplink SACCH BER. (See Protocol 0508, 0858, and 0408.) Every time BTS fails to decode the MR sent from MS, this timer decreases by 1; and every time BTS succeeds to decode the MR, this timer increases by 2. When this timer reaches 0, BTS judges that the uplink radio connection fails. Then BTS sends a radio connection failure message to BSC. This parameter and the radio link timeout (RLT) are used to judge the uplink/downlink radio connection failure.
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Paging
CCCH_CONF
Value range: 1 Non-Compounding CCCH, 1 Compounding CCCH, 2 Non-Compounding CCCHs, 3 Non-compounding CCCHs, 4 Noncompounding CCCHs.
Content: It is “Common Control Channel Configuration”. CCCH configuration determines the capacity of PCH, AGCH and RACH. This parameter can be automatically configured by the BSC Data Auto Configuration System according to the TRX channel configuration.
Recommendation: When there is one TRX in the cell, one combined CCCH is recommended (in a system with few paging messages in location area). For others, it is configured according to the number of TRX in the cell.
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Paging
BS_AG_BLKS_RES
Value range: 0~2 (1 combined CCCH), 0~7 (others)
Unit: Block
Content: It is also called Access Granted Blocks Reserved. It is the number of CCCH channel message blocks that are reserved in one multi-frame for access granted channels (AGCH).
Recommendation: 2 (non-combined CCCH)
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BS_PA_MFRAMES
Paging
Value range: 2～ ～9
Unit: Multi-frame period (51 frames)
Content: It is Paging Channel Multi-frames. It defines the number of multi-frames used as a cycle of paging subchannels.
Recommendation: 2
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Calculation Paging group = (CCCH-BLKS－ BS-AG-BLKS-RES)*BS-PA-MFRMS CCCH-BLKS： based on CCCH-CONF，9,3,18,27,36；
Paging traffic per hour = (CCCH-BLKS－ BS-AG-BLKS-RES)/0.2354*X *3600 0.2354 second： the period of BCCH 51multi-frame X： 4 (paging adopt TMSI) / 2 (paging adopt IMSI)
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ECSC
Value range: Yes, No Unit: None Content: Early Classmark Sending Control. It informs MS in a cell whether class-mark 3 should be sent in advance actively or not.
Recommendation: No.
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MBR
Value range: 0~3
Unit: None
Content: Multi-band Reporting. It is used to
GSM1800
A -92dBm
inform MS to report the
B -82dBm
adjacent cells in a controllable way. It is sent in the System Information 2ter and 5ter.
S H -84dBm
GSM900
C -68dBm
D -90dBm
E -78dBm F -88dBm G -96dBm
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NCO Value Range
nc0,nc1,nc2
Unit
None
Default Value
nc0
Description
For cell reselection nc0: Normal MS control. The MS performs automatic cell reselection. nc1: MS control with measurement reports. The MS sends measurement reports to the network and performs automatic cell reselection. nc2: Network control. The MS sends measurement reports to the network but does not perform automatic cell reselection.
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NMO Value Range
Network Operation Mode I, Network Operation Mode II, Network Operation Mode III, Reserved
Unit
None
Default Value
Network Operation Mode II
Description
Based on the paging channel used by the system When GS interface is configured, NMO I is used. When Gs interface or PCCCH is not configured, NMO II is used. When Gs interface is not configured but PCCCH is configured, NMO III is used.
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T3168 Value Range
500ms,1000ms,1500ms,2000ms,2500ms,3000ms,3500ms,4000ms
Unit
ms
Default Value
500ms
Description
Timer set for the MS to wait for the Packet Uplink Assignment message
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T3192 Value Range
500ms,1000ms,1500ms,0ms,80ms,120ms,160ms,200ms
Unit
ms
Default Value
500ms
Description
Timer set for the MS to wait for TBF release after receiving the last data block
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DRX_Timer_Max (Max. Duration of DRX) Value Range
0-64
Unit
None
Default Value
4
Description
Maximum duration of the non-DRX mode.
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Access Burst Type Value Range
8bit,11bit
Unit
bit
Default Value
8bit
Description
Access burst type used in PRACH, PTCCH/U, and packet control ACK message
Control Acknowledge Type Value Range
Four access pulses by default, RLC/MAC control block by default
Unit
None
Default Value Four access pulses by default Description
Control acknowledgment type. If four access pulses, TA can be obtained without a polling message. If RLC/MAC control block , TA can be obtained only by sending a polling message
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BS_CV_MAX Value Range
0-15
Unit
None
Default Value 10 Description
Maximum countdown value of the MS
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PAN Pan Decrement Value Range
0,1,2,3,4,5,6,7,nouse
Unit
None
Pan Max.
Default Value 2 Description
Set the value of N3102 decreased
Value Range
4,8,12,16,20,24,28,32,nouse
Unit
None
Default Value 12
Pan Increment
Description
Value Range
0,1,2,3,4,5,6,7,nouse
Unit
None
Default Value
4
Description
Set the value of N3102 increased
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The maximum value of N3102.
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