OMF010004 Cell Data ISSUE1.6

Cell Data FunctionCell data includes: Basic Property Cell extension Timer Interference Band Immediate Assignment Parameters Call Control and Processing Parameters The cell data needs to

Wireless Curriculum Development Section

ISSUE

OMF010004 Cell Data

1.6

Cell Data Function

Cell data includes:

Basic Property

Cell extension

Timer

Interference Band

Immediate Assignment Parameters

Call Control and Processing Parameters

The cell data needs to be configured in a proper way so that the network can perform at the optimum level with occupying minimum resources.

Immediate Assignment Parameters

Call Control and Processing Parameters

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.

Description: In BTS2.X, 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 BTS3X 01.1130A and later version

support paging resending function

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Max TA

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

Cell Extension

Cell extension

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Cell Extension Type

Range: Normal cell, Single timeslot extended cell, Dual

timeslot extended cell

Default: Normal cell

Description: It indicates whether a cell is an extended cell and

the extended cell mode Single timeslot extension is based on

the fixed delay extension and dual timeslot extension is based

on classic extension solution

Cell Extension Offset

Range:0~35

Unit: Km

Default: 34 (single timeslot extended cell)

Description: This parameter is valid only for the single timeslot

extended cell As the GSM time advance has a limit of 63, so t

he radius of a normal cell cannot exceed 35Km This paramete

r indicates the coverage radius of overlaid subcell in the single

timeslot extended cell

T200 and N200

link layer

requested to acknowledge the reception If this message is lost for unkn own reasons, it will occur that both ends keep waiting, leading to system deadlock

If the timer times out, the sender will regard that the receiver has not rec eived the message and will resend the message

Description: Determines whether BSC delivers LAPDm N200

parameters to BTS If it configured as Yes, then deliver LPAD

m N200 parameters will be delivered to BTS, otherwise not

Interference Band

Interference band

Content: It decides the corresponding value for each interferenc

e band (from band 0 to band 5) and used to measure the uplink i

nterference during the TCH timeslot is in idle mode

Recommended values:

 110 ( Interference band threshold 0)

 105 ( Interference band threshold 1)

 98 ( Interference band threshold 2 )

 90 ( Interference band threshold 3 )

 87 ( Interference band threshold 4 )

 85 ( Interference band threshold 5)

Immediate Assignment Parameters

Immediate assignment parameters

Description: It determines whether BSC delivers immediate

assignment retransmit parameters to BTS If it configured as

Yes, immediate assignment retransmit parameters will be

delivered, otherwise not

Max Delay of Imm_Ass Retransmit

Range: 0~254

Unit: 250 ms

Default: 4

Description: In the time of Max Delay of Imm_Ass Retransmit, i

mmediate assignment command can be scheduled to retrans

mit Out of this time, no retransmit

Description: Max retransmit times of immediate assignment co

mmand When retransmit times up to this value, it stops retran

smit, even if it is not out of the time of Max Delay of Imm_Ass

Retransmit

Call Control and Processing Parameters

Call Control and Processing Parameters

Call control and processing parameters are in Cell Call

Control Table and Cell Call Control Parameter Table

 TCH immediate assignment

 Immediate assignment optimization

 Direct Retry

Description: Option "Yes" means that TCH channel can be

immediately assigned as signaling and traffic channel when

SDCCH has no available resource The option "No" means

that only SDCCH can be assigned

Immediate Assignment Optimization

Range: Yes, No

Default: No

Description: Option "Yes" means it is allowed to optimize

assignment of channels activated by BTS when there are

multiple MS access requests This is to guarantee network

response speed