OMF000406 Advanced Radio Resource Management ISSUE1.0

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 c

OMF000406 Advanced Radio

Resource management

ISSUE 1.0

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

Upon completion this course, you will be ab

le to:

 Master the main idea and parameters of H

WII CH Ass Algorithm

 Master the parameters of H/F rate CH conv

ersion

 Understand TCH/SDCCH conversion and

TCH/PDCH Conversion

Chapter 1 HW II CH Ass Algorithm

Chapter 2 H/F CH Conversion Chapter 3 TCH/SDCCH conversion

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

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

HW II channel allocation Algorithm

 In the following condition, increase CH priority

 Update priority periodically

 Set up CH priority in one BM periodically to avoid the effect of short time interference

 iInterf priority allowed

 Range: Yes, No

 Default: Yes

 Description: Indicates whether the interference record priority

is allowed

 Allocation TRX priority allowed

 Range: Yes, No

 Default: Yes

 Description: Whether the TRX priority is used for allocation

he uplink signal quality is worse than or equal to the “Interf o

f UL Qual Thrsh.”, then uplink interference exists

 Interf of DL Level thrsh and Interf of DL qual Thrsh

 Are the same as uplink

 Filter length for SDCCH Level and Filter length for SDCCH Qual

 Are the same as previous parameter

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

Chapter 1 HW II CH Ass Algorithm

Chapter 2 H/F CH Conversion

Chapter 3 TCH/SDCCH conversion Chapter 4 TCH/PDCH Conversion

ck to the full rate TCH

 Idle Thrsh For TCH/F priority

 Range: 0~255

 Unit: Channel number

 Default:2

d “TCH Rate Conversion" is set as “Yes", can the full rate TCH convert into the half rate TCH to expand system capacity.

Chapter 1 HW II CH Ass Algorithm Chapter 2 H/F CH Conversion

Chapter 3 TCH/SDCCH conversion

Chapter 4 TCH/PDCH Conversion

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

d 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

H, the Count is set to ResTime Count is adjusted every 3 seconds If th

e current idle SDCCH channels > 8 +Idle TCH Thrsh., then: the Count minus 3 If the current idle SDCCH channels < 8 + Idle TCH Thrsh., the

n plus 12 to Count, but the Count must not exceed ResTime If the curre

nt idle SDCCH channels = 8 + Idle TCH Thrsh., then Count remains unchanged After the adjustment, if Count  0, then one TCH channel will b

e recovered

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

Chapter 1 HW II CH Ass Algorithm Chapter 2 H/F CH Conversion

Chapter 3 TCH/SDCCH conversion

Chapter 4 TCH/PDCH Conversion

 Apply- TCH Decision Period T(m)

 Range:0~65535

 Unit: minute

 In this course, we have learned the param eter 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

Summary