omf010004 cell data issue1.5

7/29/2019 Omf010004 Cell Data Issue1.5

1/33

Wireless Curriculum Development SectionWireless Curriculum Development SectionWireless Curriculum Development Section

ISSUEISSUE

OMF010004 Cell DataOMF010004 Cell DataOMF010004 Cell Data

1.51.5


2/33

Cell Data FunctionCell 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.


3/33

ContentContent

! Interference

! Radio resource

! Handover

! Other cell data


4/33

Interference DataInterference Data

! Interference

" Interference band Level

" Interference calculation period


5/33

Interference Band Threshold 0~5Interference 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)


6/33

Interference Calculation PeriodInterference Calculation Period

! Value range: 1 31

! Unit: SACCH period(480ms)

! Recommended value: 20

! Content: This parameter is the time period used to average

the interference level.


7/33

Radio Resource Cell DataRadio Resource Cell Data

! Wireless resource

" Radio resource report period

" CCCH load indication period

" CCCH load threshold

" Overload indication period

" Average RACH load timeslots


8/33

Radio Resource Report PeriodRadio Resource Report Period


! Unit: Second


! Content: BTS use this parameter to inform BSC about the

interference level for all of the idle TCH for the particular TRX.


9/33

CCCH Load Indication PeriodCCCH Load Indication Period


! Unit: Second


! Content: The reporting period by BTS to BSC about the load

of a specific CCCH timeslot.


10/33

CCCH Load ThresholdCCCH Load Threshold


! Unit: %


! Content: To set the maximum allow threshold of the CCCH

channel


11/33

Overload Indication PeriodOverload Indication Period

! Value range: 0 255

! Unit: Second


! Content: This parameter specifies the period for BTS sending

overload message to BSC. Overload includes TRX processor

overload, downlink CCCH overload.


12/33

Average RACH Load TS NumberAverage RACH Load TS Number


! Unit: timeslot


! Content: This parameter stands for the period that system

uses to judge the RACH timeslot status.


13/33

Call Assignment Related ParametersCall 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.


14/33

TCH Immediate AssignmentTCH 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.


15/33

Immediate Assignment OptimizationImmediate Assignment Optimization

! Recommended value: No.

! Content: 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.


16/33

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


! Unit: %


! Content: When the history record of TCH call re-establishment

success rate reaches this threshold, TCH immediate

assignment can be allowed.


17/33

Handover DataHandover Data

! T3105

! Maximum resend times of physical information

! Direct retry

! Response on Out BSC Handover Request


18/33

Max resend times of Phy. Info.Max resend times of Phy. Info.


! Unit: times

! Recommended value : 30

! Number of allowed times to send a physical information to the

MS on the main DCCH/FACCH


19/33

T3105T3105


! Unit: 10ms


! Content: T3105 is a timer for radio connection. See the

description of Max resend times of Phy. Info.


20/33

Direct Retry PermittedDirect Retry Permitted

! Value range: No, Yes

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

! Recommended value: Yes.


21/33

Response on Out BSC Handover RequestResponse 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.


22/33

Other Cell DataOther 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


23/33

Random Access Error ThresholdRandom Access Error Threshold


! 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 thecorrelation of the training sequence.


24/33

TCH Flow Control AllowedTCH Flow Control Allowed

! Value range: Yes, No.

! Unit: None

! Content: It indicates whether TCH channel flow control is

permitted or not.

! Recommended value: No.


25/33

Cell Extension TypeCell 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.


26/33

Cell Extension OffsetCell 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.


27/33

Maximum TAMaximum TA

! Value range: 0 127(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.


28/33

RACH Busy ThresholdRACH Busy Threshold

! Value range: 0 63 110dBm-- 47dBm)

! Unit: level value

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

! Description: The threshold level that judges whether the

RACH is busy.


29/33

Paging TimesPaging Times


! Unit: Times


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


30/33

Circuit PoolCircuit 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


31/33

SACCH Multi-frames NumberSACCH Multi-frames Number

! Value range: 0 31

! 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.


32/33

T200T200


! Unit: See the field name

! Content: It specifies T200 value for the related channel.

! Recommended value: It is difference for different channels .


33/33

omf010004 cell data issue1.5

Documents