omf010004 cell data issue1.6

7/31/2019 Omf010004 Cell Data Issue1.6

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Wireless Curriculum Development Section

ISSUEOMF010004 Cell Data

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2Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal

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.


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Content

Basic Property

Cell Extension Timer

Interference Band




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Basic Property

Basic property

SACCH Multi-Frames

Paging Times

Max TA


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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 radiolink 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 Times

Range:BTS2X 1~4, BTS3X 1~8

Unit: times

Default:1

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

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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Cell Extension

Cell extension

Cell Extension Type

Cell Extension Offset


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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.


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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

the radius of a normal cell cannot exceed 35Km. This

parameter indicates the coverage radius of overlaid subcell in

the single timeslot extended cell.


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Timer

Timer

T200

N200


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T200 and N200

Description: T200 timers are used to avoid deadlock during data transfer on the data

link layer.

On the LAPDm layer, every time a message is sent, the opposite end is

requested to acknowledge the reception. If this message is lost for

unknown reasons, it will occur that both ends keep waiting, leading to

system deadlock.

Therefore, a timer should be started when the sender sends a message.

If the timer times out, the sender will regard that the receiver has not

received the message and will resend the message.

The maximum resend times are determined by N200.

Different timer values should be set for different LAPDm channels such

as SDCCH, FACCH and SACCH. This is because these channels have

different transmission rate.


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Use LAPDm N200

Range: Yes, No

Default: No

Description: Determines whether BSC delivers LAPDm N200

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

LPADm N200 parameters will be delivered to BTS, otherwise

not.


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Interference Band

Interference band

Interference Band Threshhold


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Interference Band Threshold 0~5

Value range: 110~85

Unit: -dBm

Content: It decides the corresponding value for each

interference band (from band 0 to band 5) and used to measure

the uplink interference during the TCH timeslot is in idle mode.

Recommended values:

110 ( Interference band threshold 0)


98 ( Interference band threshold 2 )





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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal


Immediate assignment parameters

Use Imm_Ass Retransmit Parameter

Max Delay of Imm_Ass Retransmit

Max Transmit Times of Imm_Ass


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Use Imm_Ass Retransmit Parameter

Range: Yes, No

Default: No

Description: It determines whether BSC delivers immediate

assignment retransmit parameters to BTS. If it configured asYes, immediate assignment retransmit parameters will be

delivered, otherwise not.


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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,

immediate assignment command can be scheduled to

retransmit. Out of this time, no retransmit.


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Max Transmit Times of Imm_Ass

Range:1~5

Unit: Times

Default: 2

Description: Max retransmit times of immediate assignment

command. When retransmit times up to this value, it stops

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

Imm_Ass Retransmit.


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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


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TCH Immediate Assignment

Range: Yes, No

Default: No

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

immediately assigned as signaling and traffic channel whenSDCCH has no available resource. The option "No" means

that only SDCCH can be assigned.


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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 aremultiple MS access requests. This is to guarantee network

response speed.


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Direct Retry

Range: Yes, No

Default: Yes

Description: the switch to control direct retry is enabled or not.


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omf010004 cell data issue1.6

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