Microsoft Power Point - 3 OMF010004 Cell Data ISSUE1

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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

Cell Data



Page2Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.

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 occupyingminimum resources.




Basic Property Basic property

SACCH Multi-Frames

Paging Times

Max TA

Max resend times of Phy. Info.

T3105




SACCH Multi-Frames 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.




Paging Times Range:1~8(BTS3X)

Unit: times Default:1

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.




Max TA Range:

0~63 (Normal cell).

0~255 (Dual TS extended cell).

Unit: bit period (1 bit = 0.55km)

Default:

62 for normal 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.




Max Resend Times of Phy. Info. Range:1–255

Unit: times

Default:30

Description: This parameter specifies the maximum times Ny1

for re-sending physical information. If the number of resending

times exceeds Ny1 and BTS still has not received any correct

SAMB frame from MS, BTS will send BSC the connection

failure message and handover failure message. After BSC

receives the messages, it will release the assigned dedicatedchannel and stop timer T3105.




T3105 Range:0–255

Unit:10 ms

Default:7

Description:T3105 is a timer for radio connection. See the

description of Max resend times of Phy. Info.




Cell Extension Cell extension

Cell Extension Type




Cell Extension Type Range: Normal cell, Dual timeslot extended cell

Default: Normal cell

Description: It indicates whether a cell is an extended cell

and the extended cell mode.




Timer Timer

T200

N200




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.




Use LAPDm N200 Range: Yes, No

Default: No

Description: Determines whether BSC delivers LAPDm

N200 parameters to BTS. If it configured as Yes, then

LPADm N200 parameters will be delivered to BTS,

otherwise not.




Interference Band Interference band

Interference Band Threshhold




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)

105 ( Interference band threshold 1)

98 ( Interference band threshold 2 )



85 ( Interference band threshold 5)




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




TCH Immediate Assignment Range: Yes, No

Default: No

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.




Direct Retry Range: Yes, No

Default: Yes

Description: the switch to control direct retry is

enabled or not.




Assignment Cell Load Judge Enabled Range: Yes, No

Default: Yes

Description: When the Assignment Cell Load Judge

Enabled is set to Yes, the direct try flow is allowed if

the following two conditions are met:

The cell supports the direct try function.

The load of the cell is larger than or equal to the

Cell Direct Try Forbidden Threshold.




Cell Direct Try Forbidden Threshold Range: 0–6

Default: 5

Description: If the parameter Assignment Cell Load

Judge Enabled is set to Yes, the direct retry process

is started and channels are assigned when the cell

supports direct retry and the load of the current cell is

equal to or greater than the value of Cell Direct Try

Forbidden Threshold during channel assignment.




Directed Retry Load Access Threshold Range: 0–6

Default: 5

Description: This parameter is used to adjust the

candidate target cells during direct retry.When target

cells are selected during direct retry, only the cells

whose loads are smaller than or equal to the Directed

Retry Load Access Threshold are selected as candidate

target cells.



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Microsoft Power Point - 3 OMF010004 Cell Data ISSUE1

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