RAN Network Optimization Parameter Reference_RAN6.1

6.1

Network Optimization Parameter Reference

Issue 01

Date 2007-08-30

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base Bantian, Longgang Shenzhen 518129

People's Republic of China Website: http://www.huawei.com Email: [email protected]

Copyright © 2007 Huawei Technologies Co., Ltd. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

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All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but the statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.

Contents

About This Document...1

1 Power Control Parameters...1-1

1.1 Uplink Power Control Parameters...1-2 1.1.1 Power Offset Between Access Preamble and Message Control Part...1-4 1.1.2 PRACH Initial Transmit Power Constant...1-5 1.1.3 PRACH Power Ramp Step...1-6 1.1.4 Maximum Preamble Retransmit Attempts...1-6 1.1.5 Maximum Preamble Loop...1-7 1.1.6 Default DPCCH Transmit Power Constant...1-8 1.1.7 Maximum Allowed Uplink Transmit Power of the UE...1-8 1.1.8 RRC/HHO Process SRB Delay...1-10 1.1.9 RRC/HHO Process DPCCH Power Control Preamble Length...1-11 1.2 Downlink Power Control Parameters...1-11 1.2.1 Maximum Downlink Transmit Power of the Radio Link...1-13 1.2.2 Minimum Downlink Transmit Power of the Radio Link...1-14 1.2.3 Cell PCPICH Transmit Power...1-15 1.2.4 Maximum PCPICH Transmit Power...1-16 1.2.5 Minimum PCPICH Transmit Power...1-16

2 Handover Parameters...2-1

2.1 Intra-Frequency Handover Parameters...2-2 2.1.1 Softer Handover Combination Indication Switch...2-4 2.1.2 Intra-Frequency Measurement L3 Filter Coefficient...2-4 2.1.3 Weighting Factor...2-6 2.1.4 Soft Handover Relative Thresholds...2-7 2.1.5 Event 1F Absolute Thresholds...2-8 2.1.6 Hysteresis Related to Soft Handover...2-9 2.1.7 Time to Trigger Related to Soft Handover...2-11 2.1.8 Minimum Quality Threshold of Soft Handover...2-13 2.1.9 Affect 1A and 1B Event Thresholds Flag...2-14 2.1.10 Cell Individual Offset...2-14 2.2 Inter-Frequency Handover Parameters...2-15 2.2.1 Inter-Frequency Measurement Report Mode...2-19

2.2.2 Inter-Frequency Measurement Item...2-20 2.2.3 Inter-Frequency Measurement Layer 3 Filter Coefficients...2-22 2.2.4 Frequency Weighting Factor...2-23 2.2.5 Hysteresis Related to Inter-Frequency Handover...2-24 2.2.6 Time to Trigger Related to Inter-Frequency Hard Handover...2-25 2.2.7 RSCP-Based Inter-Frequency Measurement Start/Stop Thresholds...2-26 2.2.8 EC/No-based Inter-Frequency Measurement Start/Stop Thresholds...2-27 2.2.9 Target Frequency Trigger Threshold of Inter-Frequency Coverage...2-28 2.2.10 Current Used Frequency Quality Threshold of Inter-Frequency Handover...2-29 2.2.11 Inter-Frequency Measurement Minimum Access Thresholds...2-30 2.2.12 Cell Individual Offset...2-31 2.2.13 Inter-Frequency/Inter-RAT Algorithm Switches...2-32 2.2.14 Inter-Frequency/Inter-RAT Measurement Threshold Choice...2-33 2.2.15 Inter-Frequency Measure Timer Length...2-34 2.3 Coverage-Based Inter-RAT Handover Management Parameters...2-34 2.3.1 Inter-RAT Measurement L3 Filter Coefficients...2-39 2.3.2 Inter-RAT Measurement Report Mode...2-39 2.3.3 Frequency Weighting Factor...2-41 2.3.4 Inter-RAT Period Report Interval...2-42 2.3.5 BSIC Verify Selection Switch...2-42 2.3.6 Inter-RAT Measurement Quantity...2-43 2.3.7 RSCP-Based Inter-RAT Measurement Start/Stop Thresholds...2-44 2.3.8 Ec/No-Based Inter-RAT Measurement Start/Stop Thresholds...2-45 2.3.9 Inter-RAT Handover Judging Thresholds...2-46 2.3.10 Time to Trigger Related to Inter-RAT Handover...2-47 2.3.11 Hysteresis Related to Coverage-Based Inter-RAT Handover...2-48 2.3.12 Time to Trigger for Verified GSM Cell...2-49 2.3.13 Time to Trigger for Non-verified GSM Cell...2-50 2.3.14 Penalty Time for Inter-RAT Handover...2-51 2.3.15 Cell Individual Offset...2-51 2.3.16 Current Used Frequency Quality Threshold of Inter-RAT Handover...2-52 2.3.17 Inter-RAT Measure Timer Length...2-53 2.4 Non Coverage-Based Inter-RAT Handover Management Parameters...2-54 2.4.1 Inter-RAT Service Handover Switches...2-56 2.4.2 Inter-RAT Measurement L3 Filter Coefficient...2-57 2.4.3 Hysteresis of Event 3C...2-57 2.4.4 Time to Trigger for Event 3C...2-59 2.4.5 BSIC Verify Selection Switch...2-59 2.4.6 Non Coverage-Based Inter-RAT Handover Judging Thresholds...2-60 2.4.7 Penalty Time for Inter-RAT Handover...2-61 2.4.8 Inter-RAT Handover Max Attempt Times...2-62 2.4.9 Inter-RAT Measure Timer Length...2-62

2.5 Blind Handover Management Parameters...2-63 2.5.1 Blind Handover Flag...2-64 2.5.2 Blind Handover Priority...2-65 2.6 Cell Selection and Reselection...2-66 2.6.1 Measurement Hysteresis Parameters...2-69 2.6.2 Load Level Offsets...2-70 2.6.3 Minimum Quality Criterion...2-71 2.6.4 Minimum Access Level...2-72 2.6.5 Cell Reselection Start Thresholds...2-72 2.6.6 Reselection Hysteresis Time...2-73 2.6.7 Minimum Access Level for Inter-RAT Cell...2-74 2.6.8 2G Idle Mode MS's Searching for 3G Cell Signal Level Threshold...2-75 2.6.9 3G Cell Reselection Signal Level Offset...2-76 2.6.10 3G Cell Reselection Signal Level Threshold...2-77 2.7 Neighbor Management Parameters...2-77 2.7.1 Neighbor Priority Flag...2-78 2.7.2 Neighbor Priority...2-78

3 Admission Control Parameters...3-1

3.1 Uplink and Downlink Initial Access Rates of BE Service...3-5 3.2 Intelligent Admission Algorithm Switch...3-5 3.3 Uplink Total Equivalent User Number...3-7 3.4 Downlink Total NonHSDPA Equivalent User Number...3-8 3.5 AMR Voice Uplink Threshold for Conversation Service...3-8 3.6 Non AMR Voice Uplink Threshold of Conversation Service...3-9 3.7 AMR Voice Downlink Threshold for Conversation Service...3-10 3.8 Non AMR Voice Downlink Threshold of Conversation Service...3-11 3.9 Uplink Threshold for Other Services...3-12 3.10 Downlink Threshold for Other Services...3-13 3.11 Uplink Handover Admission Threshold...3-14 3.12 Downlink Handover Admission Threshold...3-15 3.13 Downlink Total Power Threshold...3-16 3.14 Uplink Handover Credit Reserved SF...3-17 3.15 Downlink Handover Credit and Channel Code Resource Reserved SF...3-17 3.16 Resources Reserved for Common Channel Load...3-18

4 Load Control Parameters...4-1

4.1 Cell Load Reshuffling Algorithm Parameters...4-2 4.1.1 Uplink and Downlink LDR Algorithm Switches...4-6 4.1.2 LDR Period Timer Length...4-7 4.1.3 Uplink and Downlink LDR Trigger Thresholds and Release Thresholds...4-8 4.1.4 Uplink or Downlink LDR Actions...4-9 4.1.5 Uplink/Downlink LDR Action Handing User Number...4-10 4.1.6 Uplink and Downlink Inter-Frequency Cell Load Handover Load Space Thresholds...4-13

4.1.7 Uplink and Downlink Inter-Frequency Cell Load Handover Maximum Band Width...4-13 4.1.8 Cell SF Reserved Threshold...4-14 4.1.9 Uplink or Downlink Credit SF Reserved Threshods...4-15 4.1.10 LDR Code Priority Indicator...4-16 4.1.11 MBMS Power Control Service Priority Threshold...4-16 4.2 Cell Overload Congestion Control Algorithm Parameters...4-17 4.2.1 Uplink and Downlink OLC Algorithm Switches...4-19 4.2.2 OLC Period Timer Length...4-20 4.2.3 Uplink and Downlink OLC Trigger Threshold and Release Threshold...4-21 4.2.4 Uplink and Downlink OLC Fast TF Restriction Times...4-22 4.2.5 Uplink and Downlink OLC Fast TF Restrict RAB Number...4-22 4.2.6 OLC Fast TF Restrict Data Rate Restrict Timer Length And Recover Timer Length...4-23 4.2.7 OLC Fast TF Restrict Data Rate Restrict Coefficient...4-24 4.2.8 Uplink and Downlink Release RAB Number...4-24

5 PS Service Rate Control Parameters...5-1

5.1 BE Service Related Threshold Parameters...5-2 5.1.1 BE Service Handover Rate Threshold... 5-3 5.1.2 Uplink/Downlink BE Service Insured Rate...5-4 5.1.3 UpLink and Downlink BE traffic DCH decision threshold...5-5 5.1.4 DL Streaming Threshold on HSDPA...5-6 5.1.5 DL BE Traffic Threshold on HSDPA...5-6 5.1.6 UL BE Traffic Threshold on HSUPA...5-7 5.1.7 UL Streaming Traffic Threshold on HSUPA...5-7 5.1.8 Streaming Service HSUPA Transmission Mode... 5-8 5.2 Dynamic Channel Configuration Control Parameters... 5-8 5.2.1 Traffic Upper Threshold...5-10 5.2.2 Traffic Lower Threshold...5-11 5.2.3 Time to Trigger Event 4A...5-12 5.2.4 Time to Trigger Event 4B...5-12 5.2.5 Pending Time after Trigger Event 4A...5-13 5.2.6 Pending time after trigger Event 4B...5-14 5.2.7 Uplink and Downlink DCCC Rate Thresholds...5-15 5.2.8 Uplink and Downlink Middle Rate Thresholds...5-15 5.2.9 Uplink and Downlink Rate Adjust Levels...5-16 5.2.10 Low activity bitrate threshold...5-17 5.3 Link Stability Parameters...5-17 5.3.1 Event Ea Relative Threshold...5-18 5.3.2 Event Eb Relative Threshold...5-19 5.3.3 Uplink Full Coverage Rate...5-19 5.3.4 Downlink Full Coverage Rate...5-20 5.4 State Transfer Parameters...5-21 5.4.1 DCH to FACH State Transition Timer...5-22

5.4.2 DCH to FACH / FACH to PCH State Transition Traffic 4B Threshold...5-23 5.4.3 FACH to PCH State Transition Timer...5-23 5.4.4 Cell ReSelection Timer...5-24 5.4.5 FACH to DCH Traffic Report Threshold...5-25 5.4.6 FACH to DCH Traffic Time to trigger...5-25 5.5 PS Inactive...5-26 5.5.1 Interactive Service T1...5-27 5.5.2 Interactive Service T2...5-28 5.5.3 Background Service T1...5-28 5.5.4 Background Service T1...5-29 5.5.5 IMS Service T1...5-30 5.5.6 IMS Service T2...5-30 5.6 RLC Retransmission Monitor Algorithm Parameters...5-31 5.6.1 Time to Start Re-TX Monitor...5-32 5.6.2 Re-Tx Monitor Period...5-33 5.6.3 Retransmission Filter Coefficient...5-34 5.6.4 Event A threshold...5-34 5.6.5 Event A Time to Trigger...5-35 5.6.6 Event A Pending Time after Trigger...5-35 5.6.7 Event A Report Period...5-36 5.6.8 Event B Threshold...5-36 5.6.9 Event B Time to Trigger...5-37 5.6.10 Event B Pending Time after Trigger...5-38

6 Miscellaneous Topic Parameters...6-1

6.1 Cell Channel Power Distribution Parameters...6-2 6.1.1 Maximum Cell Transmit Power...6-3 6.1.2 Cell PCPICH Transmit Power...6-4 6.1.3 PSCH and SSCH Transmit Power...6-4 6.1.4 BCH Transmit Power...6-5 6.1.5 Maximum FACH Transmit Power...6-6 6.1.6 PCH Transmit Power...6-7 6.1.7 PICH Transmit Power...6-7 6.1.8 AICH Transmit Power...6-8 6.2 Paging Parameters...6-9 6.2.1 Paging Cycle Coefficient...6-9 6.2.2 Number of Paging Retransmit...6-10 6.3 RRC Connection Setup Parameters...6-11 6.3.1 T300 and N300...6-11 6.4 Synchronization Parameters...6-12 6.4.1 Number of Successive In-sync Indications...6-14 6.4.2 Number of Successive Out-of-sync Indications...6-14 6.4.3 Radio Link Failure Timer Duration...6-15

6.4.4 N312 and T312...6-16 6.4.5 N313, N315, and T313...6-17 6.5 Location Update Parameters...6-17 6.5.1 Periodic Location Update Timer...6-18 6.6 User Priority Related Parameters...6-18 6.6.1 User Priority of Allocation/Retension Priority 1~14...6-19 6.6.2 Integrate Priority Configured Reference...6-20 6.6.3 Indicator of Carrier Type Priority...6-21

7 HSDPA Parameters...7-1

7.1 HSDPA Power Resource Management Parameters...7-2 7.1.1 HS-DPCCH Power Management Parameters...7-2 7.1.2 Total Power of HSDPA and Measurement Power Offset Constant...7-10 7.2 HSDPA Code Resource Management Algorithm Parameters...7-12 7.2.1 HSDPA Code Resource Distribution Mode...7-13 7.2.2 Number of HS-PDSCH Codes...7-13 7.2.3 Number of Maximum HS-PDSCH Codes...7-14 7.2.4 Number of Minimum HS-PDSCH Codes...7-14 7.2.5 Number of HS-SCCH Codes...7-15 7.3 HSDPA Mobility Management Parameters...7-16 7.3.1 HSPA Handover Protection Length...7-16 7.4 HSDPA Direct Retry and Switch of Channel Types Parameters...7-18 7.4.1 D2H Retry Timer Length...7-19 7.4.2 Timer Length of D2H Intra-Handover...7-19 7.4.3 Timer Length of D2H Inter-Handover...7-20 7.4.4 Timer Length of Multi-Carrier Handover...7-21 7.4.5 Compress Mode Permission Indication on HSDPA...7-21 7.5 HSDPA Admission Control Algorithm...7-22 7.5.1 Maximum HSDPA Users of NodeB...7-23 7.5.2 UL HS-DPCCH Reserve Factor...7-24 7.5.3 HSDPA Streaming PBR Threshold...7-24 7.5.4 HSDPA Best Effort PBR Threshold...7-25 7.5.5 Maximum HSDPA User Number...7-25

8 HSUPA Parameters...8-1

8.1 HSUPA MAC-e Scheduling Algorithm Parameters...8-2 8.1.1 Maximum Target Uplink Load Factor...8-2 8.1.2 Target Non-Serving E-DCH to Total E-DCH Power Ratio...8-3 8.2 HSUPA Admission Control Algorithm...8-4 8.2.1 Maximum HSUPA User Number... 8-4 8.2.2 DL HSUPA Reserved Factor ... 8-5 8.2.3 NodeB Maximum HSUPA User Number...8-6

9.1 MBMS Admission and Load Control Parameters...9-2 9.1.1 Maximum Transmit Power of the FACH...9-3 9.1.2 Minimum Coverage Percentage of the MBMS Service with the Highest Priority...9-4 9.1.3 Minimum Coverage Percentage of the MBMS Service with the Lowest Priority...9-5 9.1.4 Service Priority Threshold for Decreasing Power...9-5 9.1.5 MBMS Preempt Algorithm Switch...9-6 9.2 FLC/FLD Algorithm Parameters...9-7 9.2.1 FLC Algorithm Switch...9-7

10 Algorithm Switches...10-1

10.1 Connection-Oriented Algorithm Switches in RNC...10-2 10.1.1 Channel Algorithm Switches...10-2 10.1.2 Handover Algorithm Switches...10-6 10.1.3 Power Control Algorithm Switches...10-11 10.1.4 HSPA Algorithm Switches...10-13 10.1.5 DRD Algorithm Switches...10-15 10.2 Cell Algorithm Switches...10-16 10.2.1 Cell Algorithm Switches...10-16 10.2.2 Uplink Admission Control Algorithm Switch ...10-18 10.2.3 Downlink Admission Control Algorithm Switch...10-19 10.3 Other Algorithm Switches...10-20 10.3.1 Iub CAC Algorithm Switches...10-20 10.3.2 Iub Bandwidth Congestion Control Algorithm Switch...10-20 10.3.3 Intra-Frequency Measurement Control Information Indication...10-21 10.3.4 Inter-Frequency/Inter-RAT Measurement Indication...10-22 10.3.5 FACH Measurement Indicator ...10-22

11 Transmission Resource Management Parameters...11-1

11.1 Transmission Common Parameters...11-2 11.1.1 AAL2 Path Type...11-2 11.1.2 IP Path Type...11-3 11.1.3 Per-Hop Behavior...11-3 11.2 Iub Admission Control Parameters...11-4 11.2.1 Reserved Bandwidth for Forward/Backward Handover...11-4 11.3 Iub Congestion Control Parameters...11-5 11.3.1 Forward/Backward Congestion Threshold...11-8 11.3.2 Forward/Backward Congestion Clear Threshold...11-9 11.3.3 Iub Bandwidth Congestion Control Algorithm Switch...11-9 11.3.4 Timer Length for Iub Bandwidth Restriction Service Rate Reduction...11-10 11.3.5 Iub Congestion Factors...11-11

12 Parameters Configured on NodeB LMT...12-1

12.1 HSDPA Flow Control Parameters...12-2 12.1.1 HSDPA Bandwidth Adjustment Switch...12-2

12.1.2 Frame Discard Rate Threshold on Iub Interface...12-3 12.1.3 Time Delay Threshold on Iub Interface...12-4 12.2 HSDPA MAC-hs Scheduling Algorithm Parameters...12-5 12.2.1 Resource Allocate Method...12-8 12.2.2 Scheduling Method...12-9 12.2.3 Maximum Retransmission Count...12-10 12.2.4 Power Margin...12-10 12.2.5 HS-SCCH Power Control Method...12-11 12.2.6 HS-SCCH Fixed Power or Initial Transmit Power...12-12 12.2.7 Target HS-SCCH FER...12-12 12.2.8 Initial BLER of Data Transfer ...12-13 12.2.9 Resource Limiting Switch...12-14 12.2.10 HSDPA Dynamic Code Switch...12-14 12.2.11 16QAM Switch...12-15 12.2.12 CQI Filter Alpha...12-16 12.2.13 GBR for SPI...12-16 12.2.14 Weight for SPI...12-18 12.2.15 Resource Limiting Ratio for SPI...12-18 12.3 HSUPA MAC-e Scheduling Algorithm Parameters...12-19 12.3.1 AG Threshold...12-20 12.3.2 Average Rate Initial Value...12-20 12.3.3 GBR Schedule Switch...12-21 12.3.4 Sort Rate Weight...12-22 12.3.5 Sort Rate RSN Weight...12-22 12.4 HSUPA Power Control Parameters...12-23 12.4.1 Power Control Algorithm Switches for Downlink Control Channel...12-23 12.4.2 Fixed Power Control Mode Algorithm Parameters...12-28 12.4.3 Dynamic Power Control Mode Algorithm Parameters...12-32 12.5 Local Cell Management Parameters...12-36 12.5.1 Cell Radius...12-36 12.5.2 Cell Handover Radius...12-37

Figures

Tables

Table 1-1 List of uplink power control parameters...1-2 Table 1-2 List of downlink power control parameters...1-12 Table 1-3 Maximum and minimum downlink transmit powers...1-13 Table 2-1 List of intra-frequency handover parameters...2-2 Table 2-2 List of inter-frequency handover parameters...2-15 Table 2-3 List of coverage-based inter-RAT handover management parameters...2-35 Table 2-4 List of non-coverage-based inter-RAT handover management parameters...2-55 Table 2-5 List of blind handover management parameters...2-63 Table 2-6 List of cell selection and reselection parameters...2-66 Table 2-7 List of neighbor management parameters...2-77 Table 3-1 List of admission control parameters...3-1 Table 4-1 List of cell load reshuffling (LDR) algorithm parameters... 4-2 Table 4-2 List of smart load control parameters...4-17 Table 5-1 List of BE service related threshold parameters...5-2 Table 5-2 List of dynamic channel configuration parameters...5-9 Table 5-3 List of link stability parameters...5-17 Table 5-4 List of state transfer parameters...5-21 Table 5-5 List of PS inactive parameters...5-26 Table 5-6 List of RLC retransmission monitor algorithm parameters...5-31 Table 6-1 List of cell channel power distribution parameters...6-2 Table 6-2 List of paging parameters...6-9 Table 6-3 List of RRC connection setup parameters...6-11 Table 6-4 List of synchronization parameters...6-13 Table 6-5 List of location update parameters...6-18 Table 6-6 List of user priority related parameters...6-19 Table 7-1 List of HS-DPCCH power control parameters...7-2 Table 7-2 List of total power of HSDPA and measurement power offset constant...7-10 Table 7-3 List of HSDPA code resource management algorithm parameters...7-12 Table 7-4 List of HSDPA mobility management parameters...7-16 Table 7-5 List of HSDPA direct retry and switch of channel types parameters...7-18 Table 7-6 List of HSDPA admission control algorithm parameters...7-22 Table 8-1 List of HSUPA MAC-e scheduling algorithm parameters... 8-2 Table 8-2 List of HSUPA admission control algorithm parameters... 8-4

Table 9-1 List of MBMS admission and preempt algorithm parameters...9-2 Table 9-2 List of FLC/FLD algorithm parameters...9-7 Table 10-1 List of channel algorithm switches...10-3 Table 10-2 List of handover algorithm switches...10-6 Table 10-3 List of power control algorithm switches...10-12 Table 10-4 List of HSPA algorithm switches...10-13 Table 10-5 List of DRD algorithm switches...10-15 Table 10-6 List of cell algorithm switches...10-16 Table 10-7 CAC algorithm switches...10-20 Table 11-1 List of transmission common parameters...11-2 Table 11-2 List of Iub admission control parameters...11-4 Table 11-3 List of Iub congestion control parameters...11-6 Table 11-4 Iub Congestion Factor Configuration...11-12 Table 12-1 List of HSDPA flow control parameters...12-2 Table 12-2 List of HSDPA MAC-hs scheduling algorithm parameters...12-5 Table 12-3 GBR, weight and resource limiting ratio for SPI...12-17 Table 12-4 List of HSUPA MAC-e scheduling algorithm parameters...12-19 Table 12-5 List of power control algorithm switches for downlink control channel...12-23 Table 12-6 List of fixed power control mode algorithm parameters...12-28 Table 12-7 List of dynamic power control mode algorithm parameters...12-32 Table 12-8 List of local cell management parameters...12-36

About This Document

Purpose

This document provides the engineering technician of commercial office with a parameter setting baseline and parameter adjustment instructions.

Related Versions

The following table lists the product versions related to this document.

Product Name Version

RNC V200R009

NodeB V100R008

Intended Audience

This document is intended for:

l RNP engineers l RNO engineers

Update History

Refer to Changes in RAN Network Optimization Parameter Reference.

Organization

1 Power Control Parameters

Power control is a key WCDMA technique, through which near and far effect, shadow fading and fast fading can be overcome to ensure uplink and downlink network performance, reduce network interference and improve the system quality and capacity. As a result, power control parameter values have great impact on the network.

2 Handover Parameters

Handover aims to ensure communication continuity and good communication quality.

Handovers in WCDMA system are of the following types: soft handover, softer handover, intra-frequency hard handover, inter-intra-frequency hard handover, inter-RAT hard handover and so on. Handover emerges as the important factor affecting network performance, and handover

optimization is also significant in network optimization. Handover parameters are described according to the handover classification.

3 Admission Control Parameters

Admission control is a way for coordinating the WCDMA system capacity, coverage and quality, and it ensures the system stability and QoS requirement by control over user access.

4 Load Control Parameters

Load control is another very important function in WCDMA system. It maintains the system load within the normal range to ensure that the system’s overall QoS is in the normal range. The load control includes LDR (Load Reshuffling) and OLC (Overload Control).

5 PS Service Rate Control Parameters

The PS Service rate control includes dynamic channel configuration, state transfer.

6 Miscellaneous Topic Parameters

Special topic parameters include parameters for cell channel power distribution, paging, RRC connection setup, synchronization and location updating.

7 HSDPA Parameters

HSDPA parameters include HSDPA power resource management parameters, HSDPA code resource management algorithm parameters, HSDPA mobility management parameters, HSDPA direct retry and switch of channel types parameters, and HSDPA call admission control algorithm parameters.

8 HSUPA Parameters

HSUPA parameters include HSUPA MAC-e scheduling algorithm parameters, HSUPA power control parameters, and HSUPA admission control parameters.

9 MBMS Parameters

MBMS parameters mainly include MBMS admission and load control parameters.

10 Algorithm Switches

In the RNC, algorithm switches are divided into two classes: connection-oriented algorithm switches and cell-oriented algorithm switches.

11 Transmission Resource Management Parameters

The common configurable transmission parameters are listed here.

12 Parameters Configured on NodeB LMT

The parameters configured on the NodeB LMT described here mainly consist of the HSDPA flow control parameters, the HSDPA MAC-hs scheduling algorithm parameters, the HSUPA MAC-e scheduling algorithm parameters, the HSUPA power control parameters and the local cell management parameters.

Conventions

1. Symbol Conventions

Symbol Description

DANGER

Indicates a hazard with a high level of risk that, if not avoided, will result in death or serious injury.

WARNING

Indicates a hazard with a medium or low level of risk which, if not avoided, could result in minor or moderate injury.

CAUTION

Indicates a potentially hazardous situation that, if not avoided, could cause equipment damage, data loss, and performance degradation, or unexpected results.

TIP Indicates a tip that may help you solve a problem or save your time.

NOTE Provides additional information to emphasize or supplement

important points of the main text.

2. General Conventions

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files,directories,folders,and users are in boldface. For example,log in as user root .

Italic Book titles are in italics.

Courier New Terminal display is in Courier New.

3. Command Conventions

Convention Description

Boldface The keywords of a command line are in boldface. Italic Command arguments are in italic.

[ ] Items (keywords or arguments) in square brackets [ ] are optional. {x | y | ...} Alternative items are grouped in braces and separated by vertical

bars.One is selected.

[ x | y | ... ] Optional alternative items are grouped in square brackets and separated by vertical bars.One or none is selected.

{ x | y | ... } * Alternative items are grouped in braces and separated by vertical bars.A minimum of one or a maximum of all can be selected.

Convention Description

[ x | y | ... ] * Alternative items are grouped in braces and separated by vertical bars.A minimum of zero or a maximum of all can be selected.

4. GUI Conventions

Convention Description

Boldface Buttons,menus,parameters,tabs,window,and dialog titles are in

boldface. For example,click OK.

> Multi-level menus are in boldface and separated by the ">" signs. For example,choose File > Create > Folder .

5. Keyboard Operation

Convention Description

Key Press the key.For example,press Enter and press Tab.

Key1+Key2 Press the keys concurrently.For example,pressing Ctrl+Alt+A means the three keys should be pressed concurrently.

Key1,Key2 Press the keys in turn.For example,pressing Alt,A means the two keys should be pressed in turn.

6. Mouse Operation

Action Description

Click Select and release the primary mouse button without moving the pointer.

Double-click Press the primary mouse button twice continuously and quickly without moving the pointer.

Drag Press and hold the primary mouse button and move the pointer to a certain position.

1

Power Control Parameters

About This Chapter

Power control is a key WCDMA technique, through which near and far effect, shadow fading and fast fading can be overcome to ensure uplink and downlink network performance, reduce network interference and improve the system quality and capacity. As a result, power control parameter values have great impact on the network.

1.1 Uplink Power Control Parameters

The common configurable uplink power control parameters are listed here.

1.2 Downlink Power Control Parameters

1.1 Uplink Power Control Parameters

The common configurable uplink power control parameters are listed here.

Table 1-1 List of uplink power control parameters N

o. Parameter ID ParameterMeaning DefaultValue Relevant Command Level

1 PowerOffs etPpm Power offset between the last access preamble and message control part Signalling: -3 dB Services: -2 dB

Set: ADD PRACHTFC

Modify: The PRACH TFC needs to be deleted before being reconfigured. Cell 2 ConstantV alue Constant for PRACH initial transmit power -20, that is, -20 dB

Set: ADD PRACHBASIC

Modify: The PRACH needs to be deleted before being reconfigured. Cell 3 PowerRam pStep Power increase step of random access preamble 2, that is, 2 dB 4 PreambleR etransMax Maximum of preamble retransmissio n 8 times 5 Mmax Max preamble loop

8 times Set: ADD RACH

Query: LST RACH

Modify: MOD RACH

Cell 6 DefaultCo nstantValu e Default constant for initial DPCCH transmit power -27, that is, -27 dB

Set or modify: SET FRC

Query: LST FRC

N

o. Parameter ID ParameterMeaning DefaultValue Relevant Command Level

7 MaxAllow edUlTxPo wer MaxUlTx PowerFor Conv MaxUlTx PowerFor Str MaxUlTx PowerForI nt MaxUlTx PowerFor Bac Maximum UE uplink transmit power per service 24, that is, 24 dBm MaxAllowedUlTxPower Set: ADD CELLSELRESEL Query: LST CELLSELRESEL Modify: MOD CELLSELRESEL Service-Oriented Parameters

Set: ADD CELLCAC

Query: LST CELLCAC

Modify: MOD CELLCAC

Cell 8 RRCPRO CSRBDE LAY HHOPRO CSRBDE LAY Delay of SRB in DCH RRC process [Frame] Delay of SRB in DCH HHO process [Frame]

7 Set: ADD CELLCAC

Query: LST CELLCAC

Modify: MOD CELLCAC

Cell 9 RRCPRO CPCPREA MBLE HHOPRO CPCPREA MBLE RRC Proc DPCCH PC preamble length [Frame] HHO Proc DPCCH PC preamble length [Frame] RRC: 0 HHO: 7

1.1.1 Power Offset Between Access Preamble and Message Control Part

This parameter is the power offset between the last access preamble and the message control part. The access preamble power plus this offset equals the power of the control part.

1.1.2 PRACH Initial Transmit Power Constant

This parameter is the constant for the UE to estimate the initial PRACH transmit power in the open loop power control process.

1.1.3 PRACH Power Ramp Step

This parameter is the power increase step of the random access preambles transmitted before the UE which receives the acquisition indicator in the random access process.

This parameter is the maximum number of preambles retransmission of the UE in a preamble ramping cycle.

1.1.5 Maximum Preamble Loop

This parameter defines the maximum number of random access preamble loops. When the UE has transmitted the access preamble and the number of retransmission times has reached PreambleRetransMax, if the UE still has not received the capture indication, it repeats the access attempt after the specified waiting time. The maximum number of recycle cannot exceed Mmax.

1.1.6 Default DPCCH Transmit Power Constant

This parameter is used by the RNC to compute the DPCCH power offset which is used by the UE to compute the initial transmit power of UL DPCCH during the open loop power control process.

1.1.7 Maximum Allowed Uplink Transmit Power of the UE

The MaxAllowedULTxPower parameter determines the maximum transmit power of an UE when the UE gains access to a specific cell. This means that the cell selects

UE_TXPWR_MAX_RACH in the S rule. In addition, there are four maximum UE transmit power parameters oriented to different QoS services.

1.1.8 RRC/HHO Process SRB Delay

This parameter defines the delay of SRB in DCH RRC/HHO process.

1.1.9 RRC/HHO Process DPCCH Power Control Preamble Length

This parameter defines the DPCCH power control preamble length in DCH RRC/HHO process.

1.1.1 Power Offset Between Access Preamble and Message Control

Part

This parameter is the power offset between the last access preamble and the message control part. The access preamble power plus this offset equals the power of the control part.

Parameter ID

PowerOffsetPpm

Value Range

–5 to 10

Physical Value Range

–5 dB to 10 dB, step 1 dB

Parameter Setting

According to the field test results, the recommended value during signaling transmission is set to –3 dB, and that during service transmission to –2 dB.

Impact on the Network Performance

l If the parameter value is set too low, it is likely that the signaling and the service data carried

l If the value is too high, the uplink interference is increased, and the uplink capacity is

affected.

Relevant Commands

Set the parameter through ADD PRACHTFC, delete the PRACH TFC through RMV PRACHTFC before reconfiguring it.

It is necessary to deactivate PRACH (DEA PRACH) and the cell (DEA CELL) before RMV PRACHTFC is executed.

1.1.2 PRACH Initial Transmit Power Constant

This parameter is the constant for the UE to estimate the initial PRACH transmit power in the open loop power control process.

Parameter ID

ConstantValue

Value Range

-35 to -10

Physical Value Range

-35 dB to -10 dB， step 1 dB

Parameter Setting

The default value is -20, that is, -20 dB.

This parameter is used to calculate the transmit power of the first preamble in the random access process. The formula is as follows:

Preamble_Initial_Power = PCPICH DL TX power - CPICH_RSCP + UL_interference + Constant_Value

where

l Preamble_Initial_Power is the preamble initial transmit power of the UE. l PCPICH DL TX power is downlink transmit power of the PCPICH.

l CPICH_RSCP is the received signaling code power of the PCPICH measured by the UE. l UL_interference is the uplink interference, which is obtained by the UE receiving data

from the broadcast channel. It is calculated at the network side and broadcast to the UE. This value is kept in the background record of the UE under test.

l Constant_Value is obtained by the UE receiving data from the broadcast channel.

Impact on the Network Performance

l If the parameter value is set too high, the initial transmit power becomes higher, whereas

l If the value is too low, to satisfy the requirement of access power, it requires more ramps

and lengthens the access period.

Relevant Commands

Set this parameter through ADD PRACHBASIC and modify it through MOD

PRACHUUPARAS.

1.1.3 PRACH Power Ramp Step

This parameter is the power increase step of the random access preambles transmitted before the UE which receives the acquisition indicator in the random access process.

Parameter ID

PowerRampStep

Value Range

1 to 8

Physical Value Range

1 dB to 8 dB, step 1 dB

Parameter Setting

The default value is 2, that is 2 dB.

Impact on the Network Performance

l If this value is too high, the access process is shortened, but the probability of power waste

is higher.

l If it is too low, the access process is lengthened, but the transmitting power is saved.

It is a value should be weighed.

Relevant Commands

Set this parameter through ADD PRACHBASIC， modify it through MOD PRACHUUPARAS, and query it through LST PRACH.

1.1.4 Maximum Preamble Retransmit Attempts

This parameter is the maximum number of preambles retransmission of the UE in a preamble ramping cycle.

Parameter ID

PreambleRetransMax

Value Range

Physical Value Range

1 to 64 times

Parameter Setting

The default value is 8 times.

The product of this parameter and the previous PRACH Power Ramp Step determines the maximum ramp power of the UE within a preamble ramping cycle.

Impact on the Network Performance

l If this value is too low, the preamble power may fail to ramp to the required value, resulting

in UE access failure.

l If it is too high, the UE may repeatedly make access attempts by increasing the transmit

power, resulting in interference to other users.

Relevant Commands

Set this parameter through ADD PRACHBASIC, modify it through MOD PRACHUUPARAS, and query it through LST PRACH.

1.1.5 Maximum Preamble Loop

This parameter defines the maximum number of random access preamble loops. When the UE has transmitted the access preamble and the number of retransmission times has reached PreambleRetransMax, if the UE still has not received the capture indication, it repeats the access attempt after the specified waiting time. The maximum number of recycle cannot exceed Mmax.

Parameter ID

Mmax

Value Range

1 to 32

Physical Value Range

None.

Parameter Setting

The default value is 8.

Impact on the Network Performance

l If this parameter is too low, the UE access success rate is influenced.

l If it is too high, the UE probably tries access attempt repeatedly within a long time, which

Relevant Commands

Set this parameter through ADD RACH, query it through LST RACH, and modify it through

MOD RACH.

1.1.6 Default DPCCH Transmit Power Constant

This parameter is used by the RNC to compute the DPCCH power offset which is used by the UE to compute the initial transmit power of UL DPCCH during the open loop power control process.

Parameter ID

DefaultConstantValue

Value Range

-35 to -10

Physical Value Range

-35 dB to -10 dB

Parameter Setting

The default value is -27, that is -27 dB.

The formula given in the protocol 25.331 is as follows:

DPCCH_Initial_power = DPCCH_Power_offset - CPICH_RSCP

Where, CPICH_RSCP is the received signaling code power of the PCPICH measured by the UE.

Impact on the Network Performance

l If this parameter is too low, the uplink synchronization at the cell verge may fail during

initial link setup, which influences the uplink coverage.

l If it is too high, it leads to instant interference to the uplink receiving, decreasing uplink

receiving performance.

Relevant Commands

Set or modify this parameter through SET FRC and query it through LST FRC.

1.1.7 Maximum Allowed Uplink Transmit Power of the UE

The MaxAllowedULTxPower parameter determines the maximum transmit power of an UE when the UE gains access to a specific cell. This means that the cell selects

UE_TXPWR_MAX_RACH in the S rule. In addition, there are four maximum UE transmit power parameters oriented to different QoS services.

Parameter ID

MaxUlTxPowerForConv (maximum transmit power for the session service) MaxUlTxPowerForStr (maximum transmit power for the stream service) MaxUlTxPowerForInt (maximum transmit power for the exchange service) MaxUlTxPowerForBac (maximum transmit power for the background service)

Value Range

-50 to +33

Physical Value Range

-50 dBm to +33 dBm, with step length as 1 dBm

Parameter Setting

The setting of this parameter is based on the planned uplink network coverage.

The default setting of MaxAllowedULTxPower is 21, which stands for 21 dBm. The values of the other four parameters cannot be greater than the value of MaxAllowedULTxPower. By default, the parameters MaxUlTxPowerForConv, MaxUlTxPowerForStr,

MaxUlTxPowerForInt, and MaxUlTxPowerForBac are set to 24 dBm.

If the capacity of a cell is restricted, this group of parameters are not a constraint for the cell. The reason is that the rapid power control function can dynamically adjust the transmit power of an UE. If the coverage of a cell is restricted, the following formula is provided according to

the requirement of full coverage: You can infer that

Noiserise = I_total/P_N. Where:

l P_UE,max represents the maximum transmit power of the UE. l L_max represents the maximum path loss.

l The character v represents the activation factor of a service.

l G_p represents the processing gain of a service. The formula is: G_p = W/R, where W

represents signal bandwidth and R represents the data transmission rate of a service.

l G_a represents antenna gain, which is the sum of the actual antenna gain and the cable loss

gain.

l G_d represents the sum of diversity gains, such as multi-path diversity gain and receiver

antenna gain.

l P_N represents the background noise.

l Eb/Io represents the target SIR value of a service.

For the services that do not require full cell coverage, you can also use the previous formula to measure the transmit power of the UE that meets the special requirement for coverage area. If

the transmit power of an UE has reached the maximum, you can use the previous formula to measure the uplink coverage area.

Impact on Network Performance

If coverage area is restricted, the uplink coverage area is affected if this parameter is set to a very small value.

Relevant Commands

MaxAllowedUlTxPower: use the ADD CELLSELRESEL command for configuration, the

LST CELLSELRESEL command for query, and the MOD CELLSELRESEL command for modification.

Service-oriented parameters: use the ADD CELLCAC command for configuration, the LST CELLCAC command for query, and the MOD CELLCAC command for modification.

1.1.8 RRC/HHO Process SRB Delay

This parameter defines the delay of SRB in DCH RRC/HHO process.

Parameter ID

RRCPROCSRBDELAY HHOPROCSRBDELAY

Value Range

0 to 7

Physical Value Range

0 to 7 frames, step is 1

Parameter Setting

The default value of each parameter is 7.

The delay of SRB involves the following signalling: PHYSICAL CHANNEL RECONFIGURATION, RADIO BEARER ESTABLISHMENT, RADIO BEARER RECONFIGURATION, RADIO BEARER RELEASE, TRANSPORT CHANNEL RECONFIGURATION, HANDOVER TO UTRAN COMMAND, RRC CONNECTION SETUP and CELL UPDATE CONFIRM.

Impact on the Network Performance

The improper setting of this parameter will result in data loss and retransmission delay, which may have a negative effect on service rate and transmission delay.

Relevant Commands

Set this parameter through ADD CELLCAC, query it through LST CELLCAC and modify it through MOD CELLCAC.

1.1.9 RRC/HHO Process DPCCH Power Control Preamble Length

This parameter defines the DPCCH power control preamble length in DCH RRC/HHO process.

Parameter ID

RRCPROCPCPREAMBLE HHOPROCPCPREAMBLE

Value Range

0 to 7

Physical Value Range

0 to 7 times, step is 1

Parameter Setting

RRCPROCPCPREAMBLE is set to 0 by default, and the default value of HHOPROCPCPREAMBLE is 7.

The power control preamble involves the following signalling: PHYSICAL CHANNEL RECONFIGURATION, RADIO BEARER ESTABLISHMENT, RADIO BEARER RECONFIGURATION, RADIO BEARER RELEASE, TRANSPORT CHANNEL RECONFIGURATION, HANDOVER TO UTRAN COMMAND, RRC CONNECTION SETUP and CELL UPDATE CONFIRM.

This parameter is initially used for uplink/downlink power control convergence, preventing UE from using an uncontrollable power at the beginning. When the UE transmits signals on the DPCCH, the NodeB needs a period of time to recognize the uplink signals. The length of this period of time depends on the search implementation and the transmission delay. It is useless to start the uplink transmission on DPDCH before the above process is completed. Because at that time, the data can not be correctly received and will be lost. If the AM mode is used, the retransmission may lead to a much longer delay for data transmission.

The power control algorithm 1 is the only selection during the preamble period. This parameter is closely related to the DPCCH initial transmit power, the initial SIR target, the power control algorithm itself and the NodeB search ability, so it should be properly adjusted in reality.

Impact on the Network Performance

The improper setting of this parameter will result in data loss and retransmission delay, which may have a negative effect on service rate and transmission delay.

Relevant Commands

Set this parameter through ADD CELLCAC, query it through LST CELLCAC and modify it through MOD CELLCAC.

1.2 Downlink Power Control Parameters

Table 1-2 List of downlink power control parameters No. Parame

ter ID ParameterMeaning Default Value RelevantCommand Level

1 RlMaxD lPwr Maximum downlink transmit power of the radio link

Refer to the table

Maximum and minimum downlink transmit powers Set: ADD CELLRLPWR Query: LST CELLRLPWR Modify: MOD CELLRLPWR Cell 2 RlMinD lPwr Minimum downlink transmit power of the radio link 3 PCPICH Power Cell PCPICH transmit power

330, that is, 33 dBm Set: ADD PCPICH

Query: LST PCPICH Modify: MOD CELL 4 MaxPC PICHPo wer Maximum PCPICH transmit power 346, that is, 34.6 dBm

Set: ADD PCPICH

Query: LST PCPICH Modfy: MOD PCPICHPWR 5 MinPCP ICHPow er Minimum PCPICH transmit power 313, that is, 31.3 dBm

1.2.1 Maximum Downlink Transmit Power of the Radio Link

This parameter is the maximum downlink transmit power of radio link. It should fulfill the coverage requirement of the network planning, and the value is relative to PCPICH transmit

power.

1.2.2 Minimum Downlink Transmit Power of the Radio Link

This parameter is the minimum transmit power of downlink radio link. It should be considered with the maximum downlink transmit power and the dynamic range of power control, and its value is relative to PCPICH transmit power.

1.2.3 Cell PCPICH Transmit Power

It is used to determine the power of Primary CPICH of a cell. The reference point is the antenna connector of NodeB. Its value is related to the downlink coverage in the network planning.

1.2.4 Maximum PCPICH Transmit Power

It is used to determine the maximum transmit power of primary CPICH of a cell. The reference point is the antenna connector of NodeB. Its value is related to the downlink coverage in the network planning.

It is used to determine the minimum transmit power of primary CPICH of a cell. The reference point is the antenna connector of NodeB. Its value is related to the downlink coverage in the network planning.

1.2.1 Maximum Downlink Transmit Power of the Radio Link

This parameter is the maximum downlink transmit power of radio link. It should fulfill the coverage requirement of the network planning, and the value is relative to PCPICH transmit

power.

Parameter ID

RlMaxDlPwr

Value Range

-350 to 150

Physical Value Range

-35 dB to 15 dB, step 0.1 dB

Parameter Setting

The service type and the service rate should be considered in parameter configuration. For an individual service, the configuration values are listed in Table 1-3.

Table 1-3 Maximum and minimum downlink transmit powers Service Type (uint: bit/s) Max. Downlink Transmit

Power (in the parentheses is the dB value)

Min. Downlink

Transmit Power (in the parentheses is the dB value) CS 12.2K AMR 0(0) -150(-15) 64K transparent data 30(3) -120(-12) 56K transparent data 0(0) -150(-15) 32K transparent data -20(-2) -170(-17) 28.8K transparent data -20(-2) -170(-17) 57.6K controllable stream -10(-1) -160(-16) PS 0 stream (unidirectional) -20(-2) -170(-17) 384K 40(4) -110(-11) 256K 20(2) -130(-13)

Service Type (uint: bit/s) Max. Downlink Transmit Power (in the parentheses is the dB value)

Min. Downlink

Transmit Power (in the parentheses is the dB value) 144K 0(0) -150(-15) 128K 0(0) -150(-15) 64K 0(0) -150(-15) 32K -40(-4) -190(-19) 16K -60(-6) -210(-21) 8K -80(-8) -230(-23)

For combined services, the maximum and minimum transmit power is computed by the RNC according to the configuration of individual services.

Impact on the Network Performance

l If this parameter is too high, downlink interference may occur.

l If it is too low, it may influence the normal functioning of downlink power control.

Relevant Commands

Set this parameter through ADD CELLRLPWR, query it through LST CELLRLPWR and modify it through MOD CELLRLPWR.

1.2.2 Minimum Downlink Transmit Power of the Radio Link

This parameter is the minimum transmit power of downlink radio link. It should be considered with the maximum downlink transmit power and the dynamic range of power control, and its value is relative to PCPICH transmit power.

Parameter ID

RlMinDlPwr

Value Range

-350 to 150

Physical Value Range

-35 dB to 15 dB, step 0.1 dB

Parameter Setting

Since the dynamic range of power control is set to 15 dB, this parameter is recommended as RL

Max DL TX power -15 dB and refer to the related description of the sub clause Maximum Downlink Transmit Power of the Radio Link.

Impact on the Network Performance

l If this parameter is too low, the transmit power may become too low because of incorrect

estimation of SIR.

l If it is too high, it may influence the normal functioning of downlink power control.

Relevant Commands

Set this parameter through ADD CELLRLPWR, query it through LST CELLRLPWR and modify it through MOD CELLRLPWR.

1.2.3 Cell PCPICH Transmit Power

It is used to determine the power of Primary CPICH of a cell. The reference point is the antenna connector of NodeB. Its value is related to the downlink coverage in the network planning.

Parameter ID

PCPICHPower

Value Range

-100 to 500

Physical Value Range

-10 dBm to 50 dBm, step 0.1 dBm

Parameter Setting

The default setting is 330, namely 33 dBm.

This parameter should be set based on the actual system environment such as cell coverage (radius) and geographical environment. For the cells to be covered, the downlink coverage should be guaranteed as a premise. For the cells requiring soft handover area, this parameter should satisfy the proportion of soft handover areas stipulated in the network planning. For a cell with large coverage, the value of this parameter should be relatively high; otherwise, it should be relatively low. In a planned multi-cell environment, this parameter is definite If the value of this parameter is smaller than the planned value, coverage holes may occur when the cells are under heavy load.

Impact on the Network Performance

l If this parameter is too low, it influences directly the downlink pilot coverage range. l If it is too high, the downlink interference increases, and the cell capacity is decreased

because a lot of system resources are occupied and the interference with the downlink traffic channels are increased.

In addition, the configuration of this parameter also has direct influence on the distribution of handover areas.

Relevant Commands

Set this parameter through ADD PCPICH, query it through LST PCPICH and modify it through MOD CELL.

1.2.4 Maximum PCPICH Transmit Power

It is used to determine the maximum transmit power of primary CPICH of a cell. The reference point is the antenna connector of NodeB. Its value is related to the downlink coverage in the network planning.

Parameter ID

MaxPCPICHPower

Value Range

-100 to 500

Physical Value Range

-10 dBm to 50 dBm, step 0.1 dBm

Parameter Setting

The default setting is 34.6 dBm.

This parameter sets the upper limit of the pilot channel transmit power. When modifying the PCPICH transmit power according to the actual requirement, ensure that this parameter is greater than the actually required PCPICH power.

Impact on the Network Performance

None.

Relevant Commands

Set this parameter through ADD PCPICH, query it through LST PCPICH and modify it through MOD PCPICHPWR.

1.2.5 Minimum PCPICH Transmit Power

It is used to determine the minimum transmit power of primary CPICH of a cell. The reference point is the antenna connector of NodeB. Its value is related to the downlink coverage in the network planning.

Parameter ID

MinPCPICHPower

Value Range

Physical Value Range

-10 dBm to 50 dBm, step 0.1 dBm

Parameter Setting

The default setting is 31.3 dBm.

This parameter sets the lower limit of the pilot channel transmit power. When modifying the PCPICH transmit power according to the actual requirement, ensure that this parameter is smaller than the actually required PCPICH power.

The actual system environment, such as the cell coverage range (radius) and the geographical environment should be considered while setting this parameter. If the minimum transmit power of the main common pilot physical channel is configured too small, the cell coverage will be influenced. Ensure that this parameter is set under the condition of definite soft handover area proportion, or under the condition that no coverage hole exists.

Impact on the Network Performance

None.

Relevant Commands

Set this parameter through ADD PCPICH, query it through LST PCPICH and modify it through MOD PCPICHPWR.

2

Handover Parameters

About This Chapter

Handover aims to ensure communication continuity and good communication quality.

Handovers in WCDMA system are of the following types: soft handover, softer handover, intra-frequency hard handover, inter-intra-frequency hard handover, inter-RAT hard handover and so on. Handover emerges as the important factor affecting network performance, and handover optimization is also significant in network optimization. Handover parameters are described according to the handover classification.

2.1 Intra-Frequency Handover Parameters

The common configurable intra-frequency handover parameters are listed here.

2.2 Inter-Frequency Handover Parameters

The common configurable inter-frequency handover parameters are listed here.

2.3 Coverage-Based Inter-RAT Handover Management Parameters

The common configurable coverage-based inter-RAT handover management parameters are listed here.

2.4 Non Coverage-Based Inter-RAT Handover Management Parameters

The common configurable non-coverage-based inter-RAT handover management parameters are listed here.

2.5 Blind Handover Management Parameters

The common configurable blind handover management parameters are listed here.

2.6 Cell Selection and Reselection

The common configurable cell selection and reselection parameters are listed here.

2.7 Neighbor Management Parameters

2.1 Intra-Frequency Handover Parameters

The common configurable intra-frequency handover parameters are listed here.

Table 2-1 List of intra-frequency handover parameters No. Parameter

ID ParameterMeaning DefaultValue RelevantCommand Level

1 DivCtrlField Softer handover combination indication switch

MAY Set or modify: SET HOCOMM Query: LST HOCOMM RNC 2 IntraFreqFilte rCoef Intra-Frequency measurement L3 filter coefficient D3 For RNC

Set or modify: SET INTRAFREQHO Query: LST INTRAFREQHO For Cell Set: ADD CELLINTRAFRE QHO Query: LST CELLINTRAFRE QHO Modify: MOD CELLINTRAFRE QHO RNC Cell 3 Weight Weighting factor 0 dB

4 IntraRelThdF or1ACS IntraRelThdF or1APS IntraRelThdF or1BCS IntraRelThdF or1BPS Soft handover relative thresholds for event 1A and event 1B 1A: 6 (3 dB) 1B: 12 (6 dB) 5 IntraAblThd For1FEcNo IntraAblThd For1FRSCP Soft handover absolute thresholds for event 1F EcNo: -24 dB RSCP: -115 dBm 6 HystFor1A HystFor1B HystFor1C HystFor1D HystFor1F Hysteresis related to soft handover for events 1A, 1B, 1C, 1D and 1F 1A and 1B: 0 (0 dB) 1C/1D/1F: 8 (4 dB) 7 TrigTime1A TrigTime1B TrigTime1C TrigTime1D TrigTime1F Time-to-Trigger parameters related to soft handover for events 1A, 1B, 1C, 1D and 1F 1A: D320 (320 ms) 1B/1C/ 1D/1F: D640 (640 ms) 8 SHOQualmin Minimum quality

threshold of soft handover

No. Parameter

ID ParameterMeaning DefaultValue RelevantCommand Level

9 CellsForbidd en1A CellsSorbidd en1B Affect 1A threshold flag

AFFECT Set: ADD

INTRAFREQNCE LL Query: LST INTRAFREQNCE LL Modify: MOD INTRAFREQNCE LL NCell 10 CellIndividal Offset Cell individual offset 0

2.1.1 Softer Handover Combination Indication Switch

This parameter determines whether the NodeB implements softer combination of radio links in soft handover.

2.1.2 Intra-Frequency Measurement L3 Filter Coefficient

It is the measurement smoothing factor used for filtering the L3 intra-frequency measurement report.

2.1.3 Weighting Factor

This parameter is used to identify the threshold for triggering event 1A and 1B according to the measured value of each cell in the active set.

2.1.4 Soft Handover Relative Thresholds

These parameters define the difference between the quality of a cell (evaluated with the Ec/No of PCPICH at present) and the comprehensive quality of the active set (the best cell quality in case that W=0). The soft handover relative threshold parameters include IntraRelThdFor1ACS, IntraRelThdFor1APS (relative threshold for 1A) and IntraRelThdFor1BCS,

IntraRelThdFor1BPS (relative threshold for 1B).

2.1.5 Event 1F Absolute Thresholds

These parameters correspond to the guarantee signal strength that satisfies the basic service QoS. The absolute thresholds of soft handover include IntraAblThdFor1FEcNo and

IntraAblThdFor1FRSCP (Correspond to Ec/Io and RSCP).

2.1.6 Hysteresis Related to Soft Handover

These parameters represent the hysteresis values of the event 1A, 1B, 1C, 1D and 1F.

2.1.7 Time to Trigger Related to Soft Handover

These parameters represent the trigger delay time of the event 1A, 1B, 1C, 1D and 1F.

2.1.8 Minimum Quality Threshold of Soft Handover

When the RNC receives event 1A, 1C and 1D, it can be added to the active set only when CPICH Ec/Io of the target cell is greater than this absolute threshold.

2.1.9 Affect 1A and 1B Event Thresholds Flag

Switch CellsForbidden1A affects the relevant threshold of event 1A and Switch CellsForbidden1B affects the relevant threshold of event 1B.

2.1.10 Cell Individual Offset

2.1.1 Softer Handover Combination Indication Switch

This parameter determines whether the NodeB implements softer combination of radio links in soft handover.

Parameter ID

DivCtrlField

Value Range

MAY, MUST, MUST_NOT

Physical Value Range

l Softer combination may be implemented. l Softer combination must be implemented. l Softer combination must not be implemented.

Parameter Setting

The default value is MAY.

There are two combination methods for uplink combination of soft handover: one is maximum ratio combination at the NodeB Rake receiver, which gives the highest combination gain; the other is selective combination at the RNC, which gives a relatively smaller combination gain.

l The default value of the indication switch is MAY, which means the NodeB decides

whether to implement maximum ratio combination according to its own physical conditions

l When MUST is selected, the NodeB is forced to carry out maximum ratio combination

which is usually used in tests.

l When MUST_NOT is selected, the NodeB is forbidden to carry out maximum ratio

combination, and this method is adopted when maximum ratio combination performance of softer handover is poor.

The working status (test/normal operation) and the propagation environment should be considered when deciding whether to implement softer combination and to adopt which kind of softer combination.

Impact on the Network Performance

None.

Relevant Commands

Set this parameter through SET HOCOMM, and query it through LST HOCOMM.

2.1.2 Intra-Frequency Measurement L3 Filter Coefficient

It is the measurement smoothing factor used for filtering the L3 intra-frequency measurement report.

Parameter ID

IntraFreqFilterCoef

Value Range

Enum (D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D11, D13, D15, D17, D19), working range: Enum (D0, D1, D2, D3, D4, D5, D6, D7, D8)

Physical Value Range

Enum (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19)

Parameter Setting

The default value is D3.

The filtering of the measurement is calculated by means of the following formula: F_n = (1 - α) · F_{n - 1} + α · M_n

Where,

l F_n: the updated measurement result after filtering processing.

l F_{n - 1}: the old measurement result of the previous moment after filtering processing. l M_n: the latest measured value received from the physical layer.

l α= (1/2)(k/2), where, k comes from filter coefficient, namely the local FilterCoef. When α

is set to 1, it means there is no Layer 3 filtering.

The Layer 3 filtering should filter the random impact capability so that the filtered measured value can reflect the basic change trend of the actual measurement. Because the measured value input to Layer 3 filter is after the Layer 1 filtering, the influence of fast fading has been basically filtered; therefore, the Layer 3 filter should carry out smoothing filtering on the shadow fading and small quantity of fast fading burrs, so as to provide better measurement data for event decisions.

Impact on the Network Performance

l The greater this parameter, the stronger the smoothing effect on the signal, and the stronger

the fast fading resistance capability, but the weaker the tracing capability of the signal change. If handover is not implemented in time, call drop occurs.

l If this parameter is too low, the possibility of unnecessary soft handover and ping-pong

handover increases.

NOTE

As adjustment of this parameter seriously affects the entire handover performance, be cautious while setting this parameter.

Relevant Commands

For the RNC-oriented intra-frequency handover algorithm parameter: set it through SET INTRAFREQHO, and query it through LST INTRAFREQHO.

For the cell-oriented intra-frequency handover algorithm parameter: add it through ADD CELLINTRAFREQHO, query it through LST CELLINTRAFREQHO, and modify it through MOD CELLINTRAFREQHO.

2.1.3 Weighting Factor

This parameter is used to identify the threshold for triggering event 1A and 1B according to the measured value of each cell in the active set.

Parameter ID

Weight

Value Range

0 to 20

Physical Value Range

0 to 2, step 0.1

Parameter Setting

The default value is 0.

According to the Protocol TS25.331, in event 1A and 1B, W is defined as follows:

l When W=0, the formula is actually the measured value of the best cell, and the

determination of the relative threshold of soft handover is only related to the best cell in the active set.

l when W=1, it can be approximately considered as the equivalent signal strength when

maximum ratio combination of down links of all cells in the active is implemented.

Impact on the Network Performance

l The greater this parameter, the higher events 1A and 1B triggering thresholds obtained

under the same condition, the more difficult to join the active set, and the easier to leave the active set.

l the less this parameter, the easier to join the active set, and the more difficult to leave the

active set.

Relevant Commands

For RNC-oriented intra-frequency handover algorithm parameter: Set it through SET INTRAFREQHO, and query it through LST INTRAFREQHO.

For cell-oriented intra-frequency handover algorithm parameter: Add it through ADD CELLINTRAFREQHO, query it through LST CELLINTRAFREQHO, and modify it through MOD CELLINTRAFREQHO.

2.1.4 Soft Handover Relative Thresholds

These parameters define the difference between the quality of a cell (evaluated with the Ec/No of PCPICH at present) and the comprehensive quality of the active set (the best cell quality in case that W=0). The soft handover relative threshold parameters include IntraRelThdFor1ACS, IntraRelThdFor1APS (relative threshold for 1A) and IntraRelThdFor1BCS,

IntraRelThdFor1BPS (relative threshold for 1B).

Parameter ID

Value Range

Physical Value Range

0 to 14.5 dB, step 0.5 dB

Parameter Setting

l The default values of IntraRelThdFor1ACS and IntraRelThdFor1APS are 6, namely 3 dB. l The default values of IntraRelThdFor1BCS and IntraRelThdFor1BPS are 12, namely 6 dB.

As specified in Protocol 25.331, when CPICH Ec/No value is adopted as the measured value, the following formula is adopted for the event 1A trigger decision:

Where,

l M_New is the measured value of the cell that enters the report range; l CIO_New is the offset of this cell;

l M_i is the measured value of the cells in the active set; l N_A is the number of cells in the current active set;

l M_Best is the measured value of the best cell in the active set;

l W is the weighting value which is used for weighting the comprehensive quality of the best

l R_1a is report range, namely the relative threshold for soft handover; l H_1a is the hysteresis value of event 1A.

The following event is taken as the trigger condition of event 1B:

Where,

l M_Old is the measured value of the cell that leaves the report range; l CIO_Old is the offset of this cell;

l M_i is the measured value of the cells in the active set; l N_A is the number of cells in the current active set;

l M_Best is the measured value of the best cell in the active set;

l W is the weighting value used for weighing the comprehensive quality of the best cell and

the active set;

l R_1b is report range, namely the relative threshold for soft handover; l H_1b is the hysteresis value of event 1B.

The selection of a relative threshold for handover corresponds directly to the soft handover proportion, and it should ensure the trouble-free implementation of smoothing handover.

Impact on the Network Performance

The parameter setting determines the size of the soft handover area and the user proportion involved in soft handover.

l If the thresholds are high, the target cell joins the active set more easily, call drop occurs

more difficultly, and the UE proportion in the state of soft handover increases, but the forward resources are seriously occupied.

l If the thresholds are low, the target cell joins the active set more difficultly, the

communication quality cannot be guaranteed, and the implementation of smoothing handover is affected.

Relevant Commands

For RNC-oriented intra-frequency handover algorithm parameters: set them through SET INTRAFREQHO, and query them through LST INTRAFREQHO.

For cell-oriented intra-frequency handover algorithm parameters: add them through ADD CELLINTRAFREQHO, query them through LST CELLINTRAFREQHO, and modify them through MOD CELLINTRAFREQHO.

2.1.5 Event 1F Absolute Thresholds

These parameters correspond to the guarantee signal strength that satisfies the basic service QoS. The absolute thresholds of soft handover include IntraAblThdFor1FEcNo and

Parameter ID

Value Range

Physical Value Range

IntraAblThdFor1FEcNo: -24 dB to 0 dB, step 1 dB

IntraAblThdFor1FFRSCP: -155 dBm to 25 dBm, step 1 dBm

Parameter Setting

l The default value for IntraAblThdFor1FEcNo is -24 dB. l The default value for IntraAblThdFor1FRSCP is -115 dBm.

Event 1F means the PCPICH measured value is less than the absolute threshold.

These values are the absolute thresholds used for 1F reports in the soft handover algorithm, corresponding to the guarantee signal strength that satisfies the basic service QoS and affecting the triggering of event 1F.

Event 1F is used to trigger emergency blind handover. If the optimal cell of active set reports event 1F, it indicates the active set quality is rather poor, and blind handover is triggered at this moment to make the final attempt before call drops.

Impact on the Network Performance

The higher these thresholds, the more easily blind handover is triggered, and vice versa. In practice, adjust the values in accordance with the handover policy and network coverage.

Relevant Commands

For RNC-oriented intra-frequency handover algorithm parameters: set them through SET INTRAFREQHO, and query them through LST INTRAFREQHO.

For cell-oriented intra-frequency handover algorithm parameters: add them through ADD CELLINTRAFREQHO, query them through LST CELLINTRAFREQHO, and modify them through MOD CELLINTRAFREQHO.

2.1.6 Hysteresis Related to Soft Handover

These parameters represent the hysteresis values of the event 1A, 1B, 1C, 1D and 1F.

Parameter ID

HystFor1A HystFor1B