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7/31/2019 Omf010004 Cell Data Issue1.6
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Wireless Curriculum Development Section
ISSUEOMF010004 Cell Data
1.6
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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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3Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Content
Basic Property
Cell Extension Timer
Interference Band
Immediate Assignment Parameters
Call Control and Processing Parameters
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4Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
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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8Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Cell Extension
Cell extension
Cell Extension Type
Cell Extension Offset
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9Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
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)
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)
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Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Immediate Assignment Parameters
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
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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