omf010004 cell data issue1.5.ppt

7/30/2019 OMF010004 Cell Data ISSUE1.5.ppt

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Wireless Curriculum Development Section

ISSUEOMF010004 Cell Data

1.5


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Cell Data Function

The cell attributes are located in the Cell attributes table of BSC

data management, which have a major effect to the network

performance.

Cell attributes include:

- Interference band threshold

- T200 timer

- RF static power control

- Handover Algorithm Indicator- Immediate Assignment Indicator

The cell attributes have to be configured in a proper way so that the

network is performing at the optimum level with occupying minimum

resources.


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Content

Interference

Radio resource

Handover

Other cell data


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Interference Data

Interference

Interference band Level

Interference calculation period


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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 network interference during the TCH timeslot is in idle mode.

Recommended values:

110 ( Interference band threshold 0, the value MUST be -110dBm)

105 ( Interference band threshold 1)

98 ( Interference band threshold 2 )



85 ( Interference band threshold 5, the value must be -85dBm)


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Interference Calculation Period

Value range: 131

Unit: SACCH period(480ms)

Recommended value: 20

Content: This parameter is the time period used to averagethe interference level.


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Radio Resource Cell Data

Wireless resource

Radio resource report period

CCCH load indication period

CCCH load threshold

Overload indication period

Average RACH load timeslots


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Radio Resource Report Period

Value range: 0~255

Unit: Second


Content: BTS use this parameter to inform BSC about theinterference level for all of the idle TCH for the particular TRX.


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CCCH Load Indication Period

Value range: 0~255

Unit: Second


Content: The reporting period by BTS to BSC about the loadof a specific CCCH timeslot.


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CCCH Load Threshold

Value range: 0~100

Unit: %


Content: To set the maximum allow threshold of the CCCHchannel


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Overload Indication Period

Value range: 0255

Unit: Second


Content: This parameter specifies the period for BTS sendingoverload message to BSC. Overload includes TRX processor

overload, downlink CCCH overload.


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Average RACH Load TS Number

Value range: 0~65535

Unit: timeslot


Content: This parameter stands for the period that systemuses to judge the RACH timeslot status.


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Call Assignment Related Parameters

Call Assignment Related Parameters are in Cell Call Control

Table and Cell Call Control Para. Table

TCH immediate assignment Immediate assignment optimization

Maximum Assignment Retry Times

Assign-TCH re-Estb. Rate thrsh.


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TCH Immediate Assignment

Recommended value: No

Content: 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.


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Immediate Assignment Optimization

Recommended value: No.

Content: 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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Assign-tch Re-Estb. Rate Thrsh.

Value range: 0~100

Unit: %


Content: When the history record of TCH call re-establishmentsuccess rate reaches this threshold, TCH immediate

assignment can be allowed.


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Handover Data

T3105

Maximum resend times of physical information

Direct retry

Response on Out BSC Handover Request


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Max resend times of Phy. Info.

Value range: 1255

Unit: times

Recommended value : 30

Number of allowed times to send a physical information to the

MS on the main DCCH/FACCH


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T3105

Value range: 0255

Unit: 10ms


Content: T3105 is a timer for radio connection. See thedescription of Max resend times of Phy. Info.


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Direct Retry Permitted

Value range: No, Yes

Content: Whether to allow TCH direct retry to other cells.

Recommended value: Yes.


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Response on Out BSC Handover Request

Value range: Yes, No.

Recommended value: Yes.

Content: When BSC sends handover require to MSC, the

request maybe cant be executed normally due to MSC

resource busy or other faults. In this case the parameter

specifies the type of response that MSC send to BSC.


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Other Cell Data

Random access error threshold

Cell extension type

TCH flow control allowed

Maximum TA

RACH busy threshold

Paging times

Cell extension offset

Circuit pool

SACCH multi-frame number


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Random Access Error Threshold

Value range: 0~255

Unit: None

Recommended value: 180(BTS2X), no use in BTS3X.

Content: According to the GSM protocol, by judging the

correlation of the training sequence (41bit) system can know

whether the received signal is a MS random access signal or

nor ( At the same time system will use the MS random access

signal to calculate TA.). The parameter specifies the

correlation of the training sequence.


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TCH Flow Control Allowed

Value range: Yes, No.

Unit: None

Content: It indicates whether TCH channel flow control is

permitted or not.

Recommended value: No.


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Cell Extension Type

Value range: Normal cell, single timeslot extended cell, two

timeslots extended cell.

Unit: None

Content: It indicates whether the cell is an extended cell and

what kind of extended cell it is.


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Cell Extension Offset

Value range: 0~35

Unit: Km

Content : As the GSM time advance has a limit of 63 bits, so

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

indicates the coverage radius of normal cell.


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Maximum TA

Value range: 0127(127 means no time advance)

Unit: Bit, 1 bit means 0.55km

Content: Maximum Time Advance. Determines the actual

coverage area of BTS. When BTS receives the channel

request message or handover access information, it

determines whether channel assignment or handover should

take place in the current cell by comparing the TA with the

value of this parameter.


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RACH Busy Threshold

Value range: 063110dBm--47dBm)

Unit: level value

Defult::5(BTS2X),16(BTS3X)

Description: The threshold level that judges whether theRACH is busy.


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Paging Times

Value range: 0~255

Unit: Times


Content: BTS uses this parameter to specify the paging times.


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Circuit Pool

Value range: Select circuit pool function, deselect circuit pool

function, system auto-selection.

Recommended value: Select circuit pool function

Content: Circuit pool is the circuit property


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SACCH Multi-frames Number

Value range: 031

Unit: SACCH cycle (480ms)

Content: Used to determine whether the uplink radio link

connection fails. BSS will judge whether the radio link failure

as according to uplink SACCH BER. See Protocol 0508, 0858,

and 0408.


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T200

Value range: 0~255

Unit: See the field name

Content: It specifies T200 value for the related channel.

Recommended value: It is difference for different channels .


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