Download - SYSTEM Info(L3 Messages)
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Internal
System Information
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System Information Overview
System information (SYS INFO) contains network parameters sent
to MS through Um interface
network identity parameters (CGI, CID)
cell selection parameters
system control parameters
network function parameters
System information can be sent through two kinds of logical
channels
System information on BCCH (IN the IDLE mode)
System information on SACCH (Dedicated mode)
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SYS INFO 1
SYS INFO 1
It contains random access control information (RACH) and cell
frequency allocation table (i.e. CA table). It is transmitted on BCCH.
Content
SYS INFO 1
Cell Channel Description
(cell channel description format)
RACH Control Parameter
(random access channel control parameter)
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SYS INFO 1 - Control Parameter
These control parameters include:
Maximum re-transmitting times (MAX retrans)
Extended transmission timeslots (Tx_integer)
Common access control level (AC)
Call reestablish permitted (RE)
Emergency call permitted (EC)
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MS MAX Retrans
Value Range: 1, 2, 4, 7
Unit: Time(s)
Description: It is one of the random access control parameters. MS
MAX Retrans is the upper limit of times that MS is allowed to send
Channel Request in one immediate assignment procedure.
Command: SET GCELLCCBASIC / LST GCELLCCBASIC
T3120 will start after send the first CH Request
T3126 will start after reaching MAX Retrans without receive immediate assignment CMD reselection
T3122 will start after receiving access rejection , access will not be allowed during this timer
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Max Retransmissions for Radio Priority 1, 2,
3, 4
Parameter ID:MAXRETRANS1, MAXRETRANS2,
MAXRETRANS3, MAXRETRANS4
Value Range: 1, 2, 4, 7
Unit: Time(s)
Default Value: 7 Times
Description: MAX Retransmissions is the upper limit of times that
MS is allowed to send Channel Request in one immediate
assignment procedure.
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Max Retransmissions for Radio Priority 1, 2,
3, 4
Maximum retransmission for radio priority 1, 2 4. The 2bit
Radio Priority message carried by the MS in the Packet
Channel Request message has four levels of priorities. Level 1
is the highest priority, and level 4 is the lowest priority.
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MML: SET GCELLPRACH
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TX-integer
Parameter ID: TX
Value Range: 3~12, 14, 16, 20, 25, 32, 50
Unit: RACH Timeslot (equals to a TDMA frame, 4.615ms)
Default Value: 32
Description: Used to calculate the number of timeslots in
the interval between multiple channel requests sent by
MS.
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MML: SET GCELLIDLEBASIC
(0, 1, 2, , Max(T, 8) -1)
(S, S+1, S+2, ., S+T-1)
TX-integer should be increase in case of AGCH or SDCCH is
overloaded or RACH collision become serious
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Calculation of S
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STX-integer
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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SYS INFO 2
SYS INFO 2
It contains access control information (RACH), network color code permitted (NCC Permitted), and neighbor cell frequency allocation list
(BA1 list). It is transmitted on BCCH. Generally speaking, SYS INFO 2,
2BIS, 2TER contains different parts of the neighbor cells BCCH frequencies. Via reading and decoding BA1 list, MS can perform cell
reselection in idle mode. For a MS of GSM900 PHASE I, it only reads the
neighbor cell BCCH frequencies defined in SYS INFO 2, and ignores
those carried by 2BIS and 2TER.
Content
SYS INFO 2
Neighbor Cell BCCH Frequency Description
NCC Permitted
RACH Control Parameter
EXT IND bit = 0 means Sys Info 2 will carry all
BA1 list
EXT IND bit = 1 means Sys Info 2 will carry
part of BA1 list and Sys Info 2BIS will carry the
remaining list
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NCC Permitted
Parameter ID: NCCPERMIT
Value Range: Selection of 0~7 Perm.
Default Value: 11111111
Description: Network Color Code. It lists NCC that need
be measured by MS. If a neighbor cells NCC is
permitted, MS will report MRs of it to the network.
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MML: SET GCELLIDLEBASIC
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SYS INFO 2BIS
SYS INFO 2BIS
2BIS contains RACH control data and neighbor cells BCCH
frequencies (part of BA1 list). It is optional and transmitted on BCCH.
As the number of frequencies in BA1 list carried by SYS INFO 2 is
limited, SYS INFO 2BIS carries the rest of the BCCH frequencies in
the BA1 list that are from the same band as in SYS INFO 2.
Content
SYS INFO 2BIS
Neighbor Cell Description.
RACH Control Parameter (Same as those in SYS INFO 1)
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SYS INFO 2TER
SYS INFO 2TER
2TER contains neighbor BCCH frequencies (part of BA1
list). It is transmitted on BCCH. Only dual band MS can
read this information, and single band 900 or 1800 MS will
ignore it. Since this information carries BCCH frequencies
that belong to different band other than those in SYS INFO
2, it is unnecessary for single band MS to read.
Content
SYS INFO 2TER
Neighbor Cell Description (extended)
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SYS INFO 3
SYS INFO 3
It contains LAI, cell identity, RACH control parameters and
cell selection related parameters. It is transmitted on BCCH.
It is one of the most important information.
Content
SYS INFO 3
Cell Identity
LAI (location area identity)
Control Channel Description
Cell Option
Cell Selection Parameter
RACH Control Parameter
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Cell Identity and Location Area Identity
Cell Global Identity (CGI) consists of Location Area Identity
(LAI) and Cell Identity (CI). And LAI includes Mobile Country
Code (MCC), Mobile Network Code (MNC), and Location Area
Code (LAC). SYS INFO 3, 6, and 4 contain all or part of the
information of CGI. According to the received SYS INFO, MS
decodes the CGI, and decide whether it can register in the
network based on the MCC and MNC indicated by CGI. At the
same time, it can judge whether the current location area is
changed, so as to decide whether it is necessary to start the
location updating process.
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Control Channel Description
Control channel description includes the following parameters
IMSI Attach-Detach Allowed (ATT)
Common Control Channel Configuration (CCCH_CONF)
Access Granted Blocks Reserved (BS_AG_BLKS_RES)
Paging Channel Multi-frames (BS_PA_MFRAMES)
Periodic Location Update Timer (T3212)
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Cell Option
Cell option contains the following parameters:
Power control indication (PWRC)
Discontinuous transmission (DTX)
Radio link timeout
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Cell Selection Parameter
Cell selection parameters indicate how the MS should behave
after the MS is powered on. It includes the following
parameters:
Cell Reselection Hysteresis (CRH)
Maximum power level of control channel
(MS_TXPWR_MAX_CCH)
Minimum receiving level of MS permitted to access
(RXLEV_ACCESS_MIN)
Additional reselection parameter indicator (ACS)
Half-rate supported (Support Half-Rate)
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MS_TXPWR_MAX_CCH
Parameter ID: FMSMAXOPCC
Value Range: 0~19
Unit: level
Default Value: 5 (900MHz cell),0 (1800/1900MHz cell)
Description: This parameter determines the maximum transmit
power level of the MS when it begins to access a cell and has
not yet received power control command.
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MML: SET GCELLCCCH
GSM: 5(33dBm) to 19(5dBm)
DCS: 0(30dBm) to 15(2dBm)
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CRH(Cell Reselect Hysteresis)
Parameter ID: CRH
Value Range: 0~14, the step size is 2dB
Unit: dB
Default Value: 6
Description: Cell Reselection Hysteresis. It is the
parameter used when cell reselection happens between
two location areas.
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MML: SET GCELLIDLEBASIC
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Period of Periodic Location Update(T3212)
Parameter ID: T3212
Value Range: 0~255
Unit: 6 minutes
Default Value: 20
Description: It is the Periodic Location Update Timer. It defines
the interval of periodic location update.
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MML: SET GCELLIDLEBASIC
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ATT (Attach-detach Allowed)
Parameter ID: ATT
Value Range: Yes, No
Default ValueYes
Description: It is Attach-detach allowed. It is used to inform MS
whether IMSI attach-detach is allowed in this cell. If it is set to
Yes, the network will not process the connection to the called
mobile subscriber when MS is power-off. Thus network processing
time and radio resources are saved. Otherwise the network will
process the connection even though the MS has been powered off.
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MML: SET GCELLIDLEBASIC
ATT = Yes attach process
ATT = No, LAI changed Location update
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Paging Resources
What kind of CCCH channels are configured?
Decided by parameter: CCCH Conf
How many CCCH blocks are used for PCH in one 51 multi-frame?
Decided by parameter: BSAGBLKSRES (CCCH Blocks Reserved for
AGCH)
How many 51 multi-frame is one paging cycle?
Decided by parameter: BS_PA_MFRMS
How does the MS know which PCH block belongs to it?
Calculated by CCCH grouping and IMSI of MS
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CCCH Conf
Value Range: 1 Compounding CCCH , 1 Non-Compounding CCCH,
2 Non-Compounding CCCHs, 3 Non-compounding CCCHs, 4 Non-
compounding CCCHs.
Default Value: 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.
Description: It is Common Control Channel Configuration. CCCH
configuration determines the capacity of PCH, AGCH and RACH. This
parameter can be automatically configured by system according to the
TRX channel configuration.
Location: This parameter depend on channel configuration
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MML: SET GCELLIDLEBASIC
#of CCCH Blocks : 3,9,18,27 or 36
3 combined BCCH
9 Main BCCH
18,27,36 extended BCCH
1comp combined BCCH
1Non comp main BCCH
2Non Comp main BCCH +
extended BCCH
3Non comp main BCCH +
2 extended BCCH
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BSAGBLKSRES (CCCH Blocks Reserved for AGCH)
Parameter ID: BSAGBLKSRES
Value Range: 0~7 (Non-Compounding CCCHs), 0~2 (1 combined
CCCH)
Unit: Block
Default Value: 2 (Non-combined CCCH), 1(1 combined CCCH)
Description: BS-AG-BLKS-RES, indicating the number of the
CCCH message blocks reserved for the AGCH. After the CCCHs
are configured, the value of this parameter indicates the actual
seizure rates of the AGCHs and the PCHs over the CCCHs.
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MML: SET GCELLIDLEBASIC
All AGCH is occupied
There is free PCH block
Use it to send immediate assignment command
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BSPAMFRAMS (Multi-Frames in a Cycle on the Paging CH) Parameter ID: BSPAMFRAMS
Value Range: 2~9
Unit: Multi-frame period (51 frames)
Default Value: 2 Multi-frame period
Description: It is Paging Channel Multi-frames. It defines the
number of multi-frames used as a cycle of paging sub-channels.
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MML: SET GCELLIDLEBASIC
CCCH block contains 4 TS & can carry 2IMSI
paging or 4TMSI paging or 2immediate
assignment AGCH
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Paging Times
Value Range:1~8
Unit: Times
Default Value: 4
Description: This parameter is used for BTS to
determine whether paging is resent. Together with the
paging times configured in MSC, they jointly control the
paging resend times. The total paging times are
approximate to be the multiplication of the two.
Location: Cell Attributes/Call Control/Basic Call Control
Parameters
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PWRC
Parameter ID: CANPC
Value range: Yes, No.
Default Value: Yes
Description: It is used to indicate MS whether to delete received level value
obtained from the timeslots of BCCH when MS measures receiving level
during base band hopping mode.
When it is set to No, it means the influence of receiving level on BCCH is in
consideration.
If it is set to Yes, process it in the way mentioned above.
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MML: SET GCELLCCCH
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SYS INFO 4
It consists LAI, RACH control parameters, cell selection parameters and optional CBCH channel information. It is transmitted on BCCH. When the cell supports cell broadcast function, CBCH together with CBCH MA describe the configuration of CBCH the relevant frequency information.
Content
SYS INFO 4
LAI
Cell Selection Parameter
RACH Control Parameter
CBCH Channel Description (optional)
CBCH Mobile Allocation
SI4 Rest Octets (parameters related to cell reselection)
SYS INFO 4
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CBCH Channel Description and CBCH MA
These two parameters are optional. When system supports
cell broadcast, CBCH Channel Description explains the CBCH
channel configuration situation. When CBCH Channel is in
frequency hopping mode, CBCH MA is also needed.
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SI4 Rest Octets
It contains the following parameters:
Cell Reselection Parameter Indicator (PI)
Cell Bar Qualify (CBQ)
Cell Bar Access (CBA)
Cell Reselect Offset (CRO)
Temporary Offset (TO)
Penalty Time (PT)
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SYS INFO 5
SYS INFO 5
It describes the neighbor cell BCCH frequencies(BA2 list). It is
mandatory and is transmitted on SACCH. Different from SYS INFO 2,
MS can read the frequency described in SYS INFO 5 in dedicated
mode, report the relevant information of neighbor cells in
measurement reports, and use it as the basis for handover. Similarly,
for 900 MS of PHASE 1, it only recognizes the neighbor cell
frequencies described by SYS INFO 5, and ignores those carried by
SYS INFO 5BIS and 5TER.
Content
SYS INFO 5
Neighbor Cell Description.
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SYS INFO 5BIS
SYS INFO 5BIS
5BIS describes neighbor cells BCCH frequencies.These
frequencies are part of BA2 list. It is optional and is
transmitted on SACCH. Generally, as the number of
frequencies which can be described by SYS INFO 5 is
limited, SYS INFO 5BIS carries the rest BCCH frequencies
in the BA2 which belong to the same band as SYS INFO 5.
Content
SYS INFO 5BIS
Neighbor Cell Description
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SYS INFO 5TER
SYS INFO 5TER
5TER describes neighbor cells BCCH frequencies, these
frequencies are also a part of the BA2 list. It is transmitted
on SACCH. Similarly, only dual band MS can read this
information, and single band GSM900 or GSM1800 MS will
ignore it. It carries the BCCH frequencies of neighbor cells
whose band are different from the serving cells.
Content
SYS INFO 5TER
Neighbor Cell Description (Extended)
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SYS INFO 6
SYS INFO 6
It describes LAI, cell identity, and some parameters
describing the cells functions. It is transmitted on SACCH.
It is also one of the most important system information.
Content
SYS INFO 6
Cell Identity
LAI
Cell Option
NCC Permitted
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