G-LII 302 System Information and Cell Data-20081028-A-2.0
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Transcript of G-LII 302 System Information and Cell Data-20081028-A-2.0
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Confidential
Security Level:2008-11-3
System Information
Content
• System information
� Overview
� SI 1
� SI 2
� SI 3
� SI 4
� SI 5
� SI 6
� SI13
� Summary
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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 allocation1. Available frequencies 2. At most 64 frequencies
•CBQ •CBA
Cell priority
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BA1 table - BCCH Allocation
1. All neighbor cell’s BCCHs
2. Used for cell selection and reselection
� 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
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Related to GPRS
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Summary
★★★★★★★★DTX
★★★★★★★★Radio Link Timeout
★★★★★★★★★★★★★★★★CBA&CBQ
★★★★★★★★★★★★★★★★MS MAX Retrans&TX-Integer
System informationItem
★★★★★★★★RXLEV_ACCESS_MIN
★★★★★★★★Half rate
★★★★★★★★CRO&CRH
★★★★★★★★★★★★CGI
★★★★★★★★NCC permitted
★★★★★★★★BCCH of neighbor cell
★★★★★★★★★★★★★★★★BCCH of current cell
SI 6SI 5SI 4SI 3SI 2SI 1
Thank youwww.huawei.com
HUAWEI TECHNOLOGIES CO., LTD. Page 15Huawei Confidential
RACHMS BTS BSC
Channel_req 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
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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
SCH
BCCH
BSIC
BCCH
CGI
Idle mode
Measurement report
….
.…
Handover command
BCCH BSICIn a call
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Cell C: BCCH 97
Co-BCCH and co-BSIC in adjacent area
Cell B: BCCH 97
Cell A
moving to
BSIC: 12
BSIC: 12
BSIC: 13
Neighbor
list
….Cell A
Cell BCell A
Neighbor Serving cell
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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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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.
Access
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Random access error ThrshAccess
Number of right bits in TSCRandom access error Thrsh
38
41
40
39
38
37
36
35
34
33
0–89 or 251–255
244–250
222–243
196–221
176–195
161–175
141–160
121–140
101–120
90–100
The value ranges from 0 to 255. The recommended value is 180.
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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.
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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
Call drop
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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.
Call drop
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CCCH_CONF
� Value range: 1 Non-Compounding CCCH, 1 Compounding CCCH, 2
Non-Compounding CCCHs, 3 Non-compounding CCCHs, 4 Non-
compounding 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.
Paging
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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)
Paging
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BS_PA_MFRAMES
� 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 sub-
channels.
� Recommendation: 2
Paging
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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)
Calculation
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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
-92dBm-82dBmA
B
C -68dBm
D -90dBm
E -78dBm
F -88dBm
G -96dBm
H -84dBm
GSM1800
GSM900S
� Value range: 0~3
� Unit: None
� Content: Multi-band
Reporting. It is used to
inform MS to report the
adjacent cells in a
controllable way. It is sent in
the System Information 2ter
and 5ter.
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NCO
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.
Description
nc0Default Value
NoneUnit
nc0,nc1,nc2Value Range
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NMO
Based on the paging channel used by the systemWhen 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.
Description
Network Operation Mode IIDefault Value
NoneUnit
Network Operation Mode I, Network Operation Mode II,Network Operation Mode III, Reserved
Value Range
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T3168
Timer set for the MS to wait for the Packet Uplink Assignment messageDescription
500msDefault Value
msUnit
500ms,1000ms,1500ms,2000ms,2500ms,3000ms,3500ms,4000msValue Range
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T3192
Timer set for the MS to wait for TBF release after receiving the last data blockDescription
500msDefault Value
msUnit
500ms,1000ms,1500ms,0ms,80ms,120ms,160ms,200msValue Range
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DRX_Timer_Max (Max. Duration of DRX)
Maximum duration of the non-DRX mode. Description
4Default Value
NoneUnit
0-64Value Range
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Access Burst Type
Access burst type used in PRACH, PTCCH/U, and packet control ACK messageDescription
8bitDefault Value
bitUnit
8bit,11bitValue Range
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
Description
Four access pulses by defaultDefault Value
NoneUnit
Four access pulses by default, RLC/MAC control block by defaultValue Range
Control Acknowledge Type
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BS_CV_MAX
Maximum countdown value of the MS
Description
10Default Value
NoneUnit
0-15Value Range
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PAN
Set the value of N3102 increased Description
4Default Value
NoneUnit
0,1,2,3,4,5,6,7,nouseValue Range
Pan Increment
The maximum value of N3102. Description
12Default Value
NoneUnit
4,8,12,16,20,24,28,32,nouseValue Range
Pan Max.
Set the value of N3102 decreasedDescription
2Default Value
NoneUnit
0,1,2,3,4,5,6,7,nouseValue Range
Pan Decrement