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 )
90 ( Interference band threshold 3 )
87 ( Interference band threshold 4 )
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
Recommended value: 10
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
Recommended value: 15
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: %
Recommended value: 80
Content: To set the maximum allow threshold of the CCCHchannel
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Overload Indication Period
Value range: 0255
Unit: Second
Recommended value: 15
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
Recommended value: 5000
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: %
Recommended value: 80
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
Recommended value: 7
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
Recommended value: 1
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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