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

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

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.


BCCH of the cell MS listen to

CA table – cell allocation1. Available frequencies 2. At most 64 frequencies

•CBQ •CBA

Cell priority


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


CGI=MCC+MNC+LAC+CI

Related paging

Related Call drop


Related to GPRS


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


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


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.


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).


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}


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


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


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


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


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.


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.


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


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


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


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


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


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


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.


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.


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


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


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


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


DRX_Timer_Max (Max. Duration of DRX)

Maximum duration of the non-DRX mode. Description

4Default Value

NoneUnit

0-64Value Range


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


BS_CV_MAX

Maximum countdown value of the MS

Description

10Default Value

NoneUnit

0-15Value Range


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


Pan Max.

Set the value of N3102 decreasedDescription

2Default Value

NoneUnit


Pan Decrement

g-lii 302 system information and cell data-20081028-a-2.0

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