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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved
www.huawei.com
Internal
OMF000406 Advanced Radio Resource management
ISSUE 1.0
HUAWEI TECHNOLOGIES CO., LTD. Page 2All rights reserved
To satisfy different environments, many
kinds of advance radio resource
management algorithm are adopted,
including Huawei II CH allocation
algorithm, H/F rate CH conversion,
TCH/SDCCH conversion, PCDH/TCH
conversion. They are designed to
improve the performance of network
HUAWEI TECHNOLOGIES CO., LTD. Page 3All rights reserved
Upon completion this course, you will be able to:
Master the main idea and parameters of HWII CH Ass.
Algorithm
Master the parameters of H/F rate CH conversion
Understand TCH/SDCCH conversion and TCH/PDCH
Conversion
HUAWEI TECHNOLOGIES CO., LTD. Page 4All rights reserved
Chapter 1 HWChapter 1 HW II II CH Ass. CH Ass. AlgorithmAlgorithm
Chapter 2 H/F CH Conversion Chapter 2 H/F CH Conversion
Chapter 3 TCH/SDCCH conversionChapter 3 TCH/SDCCH conversion
Chapter 4 TCH/PDCH ConversionChapter 4 TCH/PDCH Conversion
HUAWEI TECHNOLOGIES CO., LTD. Page 5All rights reserved
Channel Assignment Algorithm
HW I Channel Allocation algorithm
uses the sequent selection mode to allocate channels
The advantage is terse and high efficiency
It is not able to allocate CH according to TRX priority,
interference, etc.
HW II Channel Allocation algorithm
allocates channels by optimum
Always choose the best one but lower efficiency
HUAWEI TECHNOLOGIES CO., LTD. Page 6All rights reserved
HW II channel allocation Algorithm
HW II channel allocation is based on interference, TRX priority
and performance record in history
Interference: extracted from MR
TRX priority: configured in OMC
Performance record in history: realized by BSC
automatically
HUAWEI TECHNOLOGIES CO., LTD. Page 7All rights reserved
HW II channel allocation Algorithm
In the following condition, increase CH priority
Assignment successful
In the following condition, decrease CH priority
Assignment fails
Call drop occur
Interference exist
Update priority periodically
Set up CH priority in one BM periodically to avoid the effect
of short time interference
HUAWEI TECHNOLOGIES CO., LTD. Page 8All rights reserved
Parameter introduction
SD allocation priority allowed
Range: Yes, No
Default: Yes
Description: If the setting is "No", then the roll selection is a
dopted for SDCCH allocation. If the setting is "Yes", then th
e optimum selection is adopted.
iInterf. priority allowed
Range: Yes, No
Default: Yes
Description: Indicates whether the interference record priorit
y is allowed.
HUAWEI TECHNOLOGIES CO., LTD. Page 9All rights reserved
Parameter introduction Active Ch Inter. Meas. Allowed
Range: Yes, No
Default: Yes
Description: Indicates whether the interference of the active
channel is measured. If the setting is "No", the system
does not judge whether the active channel is interfered, nor
sending interference indication message. Otherwise,
judgment will be made.
Allocation TRX priority allowed
Range: Yes, No
Default: Yes
Description: Whether the TRX priority is used for allocation.
HUAWEI TECHNOLOGIES CO., LTD. Page 10All rights reserved
Parameter introduction
History records priority allowed
Range: Yes, No
Default: Yes
Description: Whether the history record priority is used for
allocation.
Balance traffic allowed
Range: Yes, No
Default: Yes
Description: If the setting is "No", the channel next to the
previously allocated channel will be the starting channel for
searching a qualified channel to be allocated.
HUAWEI TECHNOLOGIES CO., LTD. Page 11All rights reserved
Parameter introduction
Interf. of UL Level thrsh.
Range:0~63,(-110dBm~-47dBm)grade
Default:31
Description: Threshold of uplink strength interference. If the uplink strength of a channel is greater than this threshold and the uplink signal quality is worse than or equal to the “Interf. of UL Qual. Thrsh.”, then uplink interference exists.
Interf. of UL qual. Thrsh.
Range:0~70, (RQ0~RQ7)
Default:40
Description: Threshold of uplink quality interference. See the description of “Interf. of UL level Thrsh. “.
Interf. of DL Level thrsh. and Interf. of DL qual. Thrsh.
Are the same as uplink
HUAWEI TECHNOLOGIES CO., LTD. Page 12All rights reserved
Parameter introduction
Filter length for TCH Level
Range:1~32
Default:6
Description: Used to filter the receiving signal strength of speech/data channel.
Filter length for TCH Qual.
Range:1~32
Default:6
Description: Used to filter the receiving signal quality of speech/data channel.
Filter length for SDCCH Level and Filter length for SDCCH Qual.
Are the same as previous parameter
HUAWEI TECHNOLOGIES CO., LTD. Page 13All rights reserved
Parameter introduction Update Period of CH Record
Range:1~1,440
Unit: minute
Default: 30
Description: In HW_II channel management algorithm, every time the duration (set by this parameter) expires, the history record of every channel will be refreshed through subtracting the value of “Update Freq. of CH record ". Thus the channel priority is raised. This parameter together with the "Update Freq. of CH record " works to prevent a channel from being allocated again, which has been deteriorated for a period.
Update Freq. Of CH record
Range:0~63
Default:2
Description: The history record priority higher than the value of this parameter will be refreshed through subtracting the value of this parameter. See the description of “Update Period of CH record”
HUAWEI TECHNOLOGIES CO., LTD. Page 14All rights reserved
Parameter introduction
TRX priority
Description: The priority of TRX (valid in HW_II channel
allocation algorithm only.).
Range: Level 0~Level 7
Default: Level 0
HUAWEI TECHNOLOGIES CO., LTD. Page 15All rights reserved
Chapter 1 HWChapter 1 HW II II CH Ass. CH Ass. AlgorithmAlgorithm
Chapter 2 H/F CH Conversion Chapter 2 H/F CH Conversion
Chapter 3 TCH/SDCCH conversionChapter 3 TCH/SDCCH conversion
Chapter 4 TCH/PDCH ConversionChapter 4 TCH/PDCH Conversion
HUAWEI TECHNOLOGIES CO., LTD. Page 16All rights reserved
Parameter introduction Support dynamic conversion between TCH/F and TCH/H. Channels initially configured as TCH
/H can not be converted.
TCH Rate adjust allowed
Range: Yes, No
Default: No.
Description: It is used to decide whether full rate TCH can be converted into half-rate TCH.
“Yes” means the conversion is feasible, while “No” means not. For the latter case, the half-
rate TCH converted will change back to the full rate TCH
Idle Thrsh. For TCH/F priority
Range: 0~255
Unit: Channel number
Default:2
Description: Parameter is used to judge which type of channel is to be allocated. If channe
l number of idle full rate TCH is greater than this threshold, then idle full rate TCH is allocat
ed first for better voice quality. otherwise, half rate TCH is allocated first.
HUAWEI TECHNOLOGIES CO., LTD. Page 17All rights reserved
Parameter introduction
TCH Rate adjust Traffic Thrsh (%)
Range:0~100
Unit:%
Default:80
Description: It is one of the terms for the full rate TCH to co
nvert into the half-rate TCH. Only if the traffic (number of cu
rrently occupied channels / number of available channels in
a cell) is greater than the threshold, and “TCH Rate Conver
sion" is set as “Yes", can the full rate TCH convert into the h
alf rate TCH to expand system capacity.
HUAWEI TECHNOLOGIES CO., LTD. Page 18All rights reserved
Parameter introduction
MIN Recovery Time of TCH/H
Range:0~65535
Unit: second
Default:600
Description: The minimum interval that half-rate TCH recovers into full rate TCH.
TCH/F Forbid TCH Rate Adjust
Range:0–255
Default:1
Description: The value of the parameter is one condition for the adjustment from
full rate TCH to half rate TCH. When the number of available half rate TCH in the
cell is more than the value, system adjust full rate TCH as half rate TCH to
enlarge the capacity.
HUAWEI TECHNOLOGIES CO., LTD. Page 19All rights reserved
Chapter 1 HWChapter 1 HW II II CH Ass. CH Ass. AlgorithmAlgorithm
Chapter 2 H/F CH ConversionChapter 2 H/F CH Conversion
Chapter 3 TCH/SDCCH conversionChapter 3 TCH/SDCCH conversion
Chapter 4 TCH/PDCH ConversionChapter 4 TCH/PDCH Conversion
HUAWEI TECHNOLOGIES CO., LTD. Page 20All rights reserved
Parameter introduction
Support dynamic conversion between TCH/F and SDCCH.
Not support dynamic conversion between TCH/H and SDCCH.
SD Dynamic Allocation Allowed
Range: Yes, No
Default: Yes
Description: Indicates whether SDCCH dynamic allocation is allowed.
HUAWEI TECHNOLOGIES CO., LTD. Page 21All rights reserved
Parameter introduction
Idle SD Thrsh.N1
Range:0~63
Default:2
Description: When the number of idle SDCCH channels is less than or equal to the “Idle SD Thrsh.”, the system will try to find available TCHs and convert them to SDCCH channels.
Note:The conditions to Initiate the TCH-to-SDCCH conversion flow:
− The number of idle SDCCH channels+8 is less than or equal to “Idle SD Thrsh.”.
− The number of current idle full rate TCH channels is more than 4 or more than the number of TRXs.
− The number of current SDCCH channels is less than “Cell SD maximum.
HUAWEI TECHNOLOGIES CO., LTD. Page 22All rights reserved
Parameter introduction
Cell SD Maximum Range:0~255
Default: Configured SDCCHs + 8
Description: The maximum number of SDCCHs in the cell.
Note
The processing flow of recovering SDCCH to TCH is as follows: a timer Count is set for each cell. Every time a TCH is converted into an SDCCH, the Count is set to ResTime. Count is adjusted every 3 seconds. If the current idle SDCCH channels > 8 +Idle TCH Thrsh., then: the Count minus 3. If the current idle SDCCH channels < 8 + Idle TCH Thrsh., then plus 12 to Count, but the Count must not exceed ResTime. If the current idle SDCCH channels = 8 + Idle TCH Thrsh., then Count remains unchanged. After the adjustment, if Count 0, then one TCH channel will be recovered.
HUAWEI TECHNOLOGIES CO., LTD. Page 23All rights reserved
Parameter introduction
Due to TRX hardware processing capability restriction, at most 2 time
slots can be configured as SDCCH channels for each TRX. To initiate
the TCH-to-SDCCH conversion, if the selected TCH is occupied, the
connection will be handed over to other idle TCH channel in this cell.
During dynamic SDCCH channel allocation, each time only one TCH is
converted into SDCCH. So does the SDCCH-to-TCH conversion.
During the TCH-to-SDCCH conversion, TCH channels on TRX in where
BCCH is located should not be selected
HUAWEI TECHNOLOGIES CO., LTD. Page 24All rights reserved
Parameter introduction
TCH Minimum Recovery Time(s)
Range:60~3600
Unit: second
Default:600
Description: The minimum interval for the TCH recovery after TCH-to-SD
CCH conversion.
HUAWEI TECHNOLOGIES CO., LTD. Page 25All rights reserved
Chapter 1 HWChapter 1 HW II II CH Ass. CH Ass. AlgorithmAlgorithm
Chapter 2 H/F CH Conversion Chapter 2 H/F CH Conversion
Chapter 3 TCH/SDCCH conversionChapter 3 TCH/SDCCH conversion
Chapter 4 TCH/PDCH ConversionChapter 4 TCH/PDCH Conversion
HUAWEI TECHNOLOGIES CO., LTD. Page 26All rights reserved
Parameter introduction
Support dynamic conversion between TCH/F and PDCH. Channels initially configured as PDCH can not be converted.
Idle TCH Thrsh. N1
Range:0~255
Default: 0
Description: Only when the number of idle TCH channels is less than or equal to the “Idle TCH Thrsh. N1” and the duration is longer than “Apply_TCH Decision Period T(m)”, can PDCH-to-TCH conversion be performed.
Apply- TCH Decision Period T(m)
Range:0~65535
Unit: minute
Default:0
Description: The duration to judge whether PDCH to TCH conversion can be performed.
HUAWEI TECHNOLOGIES CO., LTD. Page 27All rights reserved
In this course, we have learned the parame
ter of HW II CH Ass. Algorithm, H/F rate CH
conversion, TCH/SDCCH conversion and
TCH/PDCH Conversion
Apllication should be depended on the real
environment
SummarySummary
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Thank You