Enhanced F-DPCH Feature Guide

Enhanced F-DPCH Feature Guide

Enhanced F-DPCH

Enhanced F-DPCH Version

Date

Author

Reviewer

Ke V1.0

2013/12/24

Cai Yaofang

Yazhu,

Yongchao,

Revision History

Ma Yang

First edition

Hong

© 2014 ZTE Corporation. All rights reserved. ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used without the prior written permission of ZTE. Due to update and improvement of ZTE products and technologies, information in this document is subjected to change without notice.

ZTE Confidential Proprietary

1

Enhanced F-DPCH

TABLE OF CONTENTS 1

Feature Attributes ............................................................................................. 4

2 2.1 2.1.1

Overview ............................................................................................................ 4 Feature Introduction ............................................................................................. 4 ZWF26-01-010 Enhanced F-DPCH ..................................................................... 4

2.2 2.3

License Control .................................................................................................... 5 Correlation with Other Features ........................................................................... 6

3 3.1 3.1.1

Technical Description ....................................................................................... 6 ZWF26-01-010 Enhanced F-DPCH ..................................................................... 6 Frame Structure and Slot Format of an E-FDPCH ............................................... 7

3.1.2 3.1.3 3.1.4 3.1.5 3.1.6

Requirements for Utilization of the E-FDPCH....................................................... 8 Multiplexing Method of the E-FDPCH................................................................... 9 Dynamic Radio Bearer Control for the E-FDPCH ................................................. 9 Code Resource Allocation for the E-FDPCH ...................................................... 11 Mobility Management for the E-FDPCH ............................................................. 11

4 4.1

Parameters and Configurations ..................................................................... 13 ZWF26-01-010 Enhanced F-DPCH ................................................................... 13

5 5.1 5.2

Related Counters and Alarms ........................................................................ 15 Related Counters ............................................................................................... 15 Related Alarms .................................................................................................. 15

6 6.1

Engineering Guide .......................................................................................... 16 Application Scenario .......................................................................................... 16

6.2 6.3 6.4 6.5

Feature Activation Procedure ............................................................................. 16 Feature Validation Procedure ............................................................................ 19 Feature Deactivation Procedure......................................................................... 20 Network Impact .................................................................................................. 21

7

Abbreviation .................................................................................................... 21

8

References ....................................................................................................... 22


2

Enhanced F-DPCH

FIGURES Figure 2-1

F-DPCH Multiplexed .......................................................................................... 5

Figure 6-1

Parameter Configuration Interface—1...............................................................17

Figure 6-2


Figure 6-3


Figure 6-4


Figure 6-5


TABLES Table 2-1

License Control List .............................................................................................5

Table 3-1 F-DPCH Fields (Copied from Table 16C: F-DPCH Fields in 25.211)....................7 Table 5-1

Counter List ....................................................................................................... 15


3

Enhanced F-DPCH

1

Feature Attributes RNC Version: [ZXWR RNC V3.13.10.15/ZXUR 9000 V4.13.10.15] Node B Version: [ZXSDR V4.13.10.20] Attribute: [Optional] Involved NEs: NE Name

Related or Not

UE

√

Node B

√

RNC

√

iTC

-

MSC

-

MGW

-

SGSN

-

GGSN

-

HLR

-

―√‖:

Special Requirement Enhanced F-DPCH should be supported by the UEs. Enhanced F-DPCH should be supported by the Node Bs.

Involved, ―-―: Not involved.

2

Overview

2.1

Feature Introduction

2.1.1

ZWF26-01-010 Enhanced F-DPCH As a substitute for a downlink associated DPCCH, an F-DPCH is introduced to improve DL channelization code utilization efficiency. One F-DP CH can transmit TPCs of up to 10 UEs per slot, see the following figure.


4

Enhanced F-DPCH

Figure 2-1 UE2

F-DPCH Multiplexed UE1

UE3

UE1

UE10

UE2

UE3

UE1

UE1

...

1 slot

time

Because of soft handover or softer handover, each UE probably needs to receive F-DPCH signals from several cells. As a result, the average number of UEs served by each F-DPCH is reduced. Moreover, the F-DPCH is constrained by a timing offset; therefore, all F-DPCHs received by one UE must have the same timing offset. If another UE in the status of macro-diversity wants to use the same timing offset for the same F-DPCH, conflict occurs. In this case, the capacity of each F-DPCH is further reduced. Assuming that 30% of UEs are in the status of soft or softer han dover, the capacity of an F-DPCH is decreased to 3 or 4 UEs actually. The enhanced F-DPCH feature has removed the restriction on F-DPCH timing offset, for example, allow activating several F-DPCHs to use different timing offsets, which are configured at the network side. This feature requires the UE to buffer a 1-bit TPC command per slot. Because the enhanced F-DPCH is introduced, the F-DPCH slot format defined in 3GPP R6 is changed. Originally, the offset is a fixed value from the TPC field to the slot boundary. After being changed, the offset is determined by one of the multiple F-DPCH slot formats. Assuming that 30% of UEs are in the status of soft or softer handover, the capacity of an enhanced F-DPCH is increased to 7 UEs actually.

2.2

License Control Table 2-1

License Control List

Feature ID ZWF26-01-010


Feature Name

License

Configured

Sales

Control Item

NE

Unit

WCDMA Enhanced

Number of

F-DPCH

cells

RNC

Cell

5

Enhanced F-DPCH

2.3

Correlation with Other Features 1.

Required Features ZWF23-01-A HSDPA Introduction Package

2.

Mutually Exclusive Features None

3.

Affected Features None

3

Technical Description

3.1

ZWF26-01-010 Enhanced F-DPCH This feature is optional in 3GPP Rel-7. Because the slot formats for an F-DPCH are extended, there are 10 options for TPC position in one time slot at an F-DPCH frame offset. Compared with the F-DPCH in 3GPP Rel-6, an E-FDPCH increases the multiplexing opportunity for the UE during a soft handover, which saves downlink channelization code resources.

For the basic principles of an F-DPCH, refer to the ZTE UMTS F-DPCH & SRB over HSDPA Feature Guide. For convenient description, the F-DPCH in this feature guide denotes a usual F-DPCH, and the E-FDPCH denotes an enhanced F-DPCH introduced in 3GPP Rel-7, that is, the extended slot formats based on the F-DPCH in 3GPP Rel-6. The differences between E-FDPCH and F-DPCH only reside in the multiplexing method, dynamic radio bearer control and mobility management, while the same parts are not described in this feature guide. For more details, refer to the ZTE UMTS F-DPCH & SRB over HSDPA Feature Guide.


6

Enhanced F-DPCH

3.1.1

Frame Structure and Slot Format of an E-FDPCH The frame structure of an E-FDPCH is the same as that of an F-DPCH, and is illustrated in the following figure. The difference is the slot format.

Figure 3-1

Frame structure of an F-DPCH

In 3GPP Rel-6, a fixed slot format (Slot Form at #0 in the following table) is used. In 3GPP Rel-7, there are 10 slot formats. Each slot format corresponds to a different position of the TPC field within an F-DPCH slot. Ten positions of 256 chips are denoted by Slot Format #0 –#9. The exact number of bits of the OFF periods and the number of the TPC field (NTPC) are described in the following table.

Table 3-1 Slot

F-DPCH Fields (Copied from Table 16C: F-DPCH Fields in 25.211) Chann Channe SF

Format el Bit #i

l

Rate

Symbol

(kbps)

Rate

Bits/

NOFF1

NTPC

NOFF2

Slot

Bits/Slot

Bits/Slot

Bits/Slot

(ksps) 0

3

1.5

256 20

2

2

16

1

3

1.5

256 20

4

2

14

2

3

1.5

256 20

6

2

12

3

3

1.5

256 20

8

2

10

4

3

1.5

256 20

10

2

8

5

3

1.5

256 20

12

2

6

6

3

1.5

256 20

14

2

4

7

3

1.5

256 20

16

2

2


7

Enhanced F-DPCH

Slot

Chann Channe SF

Format el Bit #i

l

Rate

Symbol

(kbps)

Rate

Bits/

NOFF1

NTPC

NOFF2

Slot

Bits/Slot

Bits/Slot

Bits/Slot

(ksps) 8

3

1.5

256 20

18

2

0

9

3

1.5

256 20

0

2

18

Because the multiplexing is independent of each cell, the F-DPCH slot format is configured by the CRNC. For Iur, the slot form at is allocated by the DRNC and t hen transfered to the SRNC. The UE during a soft hanover receives different slot formats from different cells and combines multiple TPC commands about the same downlink slot from the same radio link set.

3.1.2

Requirements for Utilization of the E-FDPCH When the following conditions are met, the E-FDPCH can be enabled for the UE. 

The parameter for the E-FDPCH on the RNC level (Uhspa.rncEfdpchSupInd ) is set to ―Supported‖.



The parameter for the E-FDPCH on the cell level (UUtranCellFDD.efdpchSupInd ) is set to ―Supported‖.



The Node B indicates that the cell supports the E-FDPCH through the F-DPCH Slot Format Capability IE in the AUDIT RESPONSE message or other related messages.



The UE indicates that it supports the E-FDPCH through the Enhanced F-DPCH supported IE.



There is no DCH in the downlink.

Note: If the conditions for utilizing the E-FDPCH are met and SRBs can be carried on HSDPA, and if there is a service carried on HSUPA, the conditions for SRBs carried on HSUPA


8

Enhanced F-DPCH

should be also met, otherwise, SRBs cannot be carried on HSDPA and the E-FDPCH cannot be used. For details, referto the ZTE UMTS SRB over HSUPA Feature Guide. For an inter-RNC neighboring cell, the E-FDPCH capacity is configured by UExternalUtranCellFDD.eFdpchSupInd .

3.1.3

Multiplexing Method of the E-FDPCH For the cells and the UEs supporting the E-FDPCH, the multiplexing method of the channelization code for the E-FDPCH is independent of the configured F-DPCH frame offset, which means that the UEs with the same F-DPCH frame offset can use the same channelization code in different slot formats. The RNC allocates an F-DPCH slot format to each radio link through the Iub and the Uu interfaces. Both Rel-6 UEs and Rel-7 UEs may exist in a cell supporting the E-FDPCH. In order to allocate the same channelization code for the F-DPCH to UEs in these two versions, the RNC allocates an idle TPC bit position first for Rel-6 UEs, and then detemines the F-DPCH frame offset based on Slot Format #0 and the TPC bit position for the UE to establish the first radio link.

3.1.4

Dynamic Radio Bearer Control for the E-FDPCH The principle of dynamic radio bearer control for the E-FDPCH is almost the sam e as that for the F-DPCH except for the parameters. Because the use of the F-DPCH is related to SRBs, the signaling channel allocation in the RRC phase, and signaling channel allocation in the RAB phase and Dynamic Channel Type Transfer are described as follows.

3.1.4.1

Signaling Channel Allocation in the RRC Phase If the following conditions are met in the RRC phase, the SRBs of the UE can be carried on the HS-DSCH and there is an associated F-DPCH. 

The conditions of using E-FDPCH are satisfied, refer to 3.1.2 Requirements for Utilization of the E-FDPCH;


9

Enhanced F-DPCH



The URncFunction.InitRrcOnDch parameter is set to ―7: Forced to HSPA‖ or ―8: Not

Forced,Using HSPA Signalling on CELL_DCH state‖ . If either of the above conditions is not met or the SRB fails to be established on HSPA, the RNC attempts to establish SRBs on the DCH at the rate of 3.4 kbps.

3.1.4.2

Signaling Channel Allocation in the RAB Phase If the SRB is established on the DCH in the RRC phase, and if the following conditions are met in the RAB phase, the SRBs of the UE in the RAB phase can be carried on the HS-DSCH and there is an associated F-DPCH. 

The conditions of using E-FDPCH are satisfied, refer to 3.1.2 Requirements for Utilization of the E-FDPCH;



If the UHspa.Event1fHsInd parameter is set to ―1: True‖ and event 1F is configured to the UE (that is, the measurement control message of event 1F is sent to the UE), event 1F is not triggered; otherwise, event 1F does not need to be considered.

For the other scenarios of HS-DSCH serving cell change (including intra-frequency and inter-frequency), transition from non HS-DSCH to HS-DSCH triggered by the traffic volume in a cell, or relocation into the RNC, the conditions for E-FDPCH usage are the same as those for signaling channel allocation in the RAB phase. Note: Event 1f indicates that the quality of a primary CPICH becomes worse than an absolute threshold during a specified period. For details, refer to the ZTE UMTS Handover Control Feature Guide.

3.1.4.3

Dynamic Channel Type Transfer for the E-FDPCH The principles of dynamic channel type transfer for the E-FDPCH are the same as those for the F-DPCH. For details, refer to the ZTE UMTS F-DPCH & SRB over HSDPA Feature Guide.


10

Enhanced F-DPCH

3.1.5

Code Resource Allocation for the E-FDPCH Code resource allocation for the E-FDPCH is only related to channelization code allocation and scrambling code allocation for a new established F-DPCH. The allocation method is the same as that for the F-DPCH. For details, refer to the ZTE UMTS F-DPCH & SRB over HSDPA Feature Guide.

3.1.6

Mobility Management for the E-FDPCH A cell supporting the E- FDPCH and a cell only supporting the F-DPCH may be adjacent cells, but the F-DPCH multiplexing method in each cell is independent, so the two kinds of cells can be in the same active set. If a UE supports the E-FDPCH, then the following situation may occur: Cell 1 in the active set allocates the F-DPCH based on the method in Rel-6 and cell 2 in the active set allocates the F-DPCH based on the method in Rel-7. When the serving HS-DSCH cell changes, if the F- DPCH/E-FDPCH is used in the source cell, but the conditions to use the F-DPCH/E-FDPCH are not met in the target cell, the transition from F-DPCH to DPCH will be triggered. When the serving HS-DSCH cell changes, if DPCH is used in the source cell, and the conditions to use F-DPCH/E-FDPCH is met in all the cells in the active set, the transition from a DPCH to an F-DPCH will be triggered. During a hard handover or relocation into the RNC, if the target cell meets the conditions to use the E-FDPCH, an F-DPCH is allocated. Note: For the conditions to use the E-FDPCH, refer to 3.1.4.2 Signaling Channel Allocation in the RAB. For mobility management for the F-DPCH, refer to the ZTE UMTS F-DPCH & SRB over HSDPA Feature Guide. Because the F-DPCH Slot Format Support Request IE cannot be carried in the Radio link addition message across the Iur interface, the F-DPCH cell and the E-FDPCH cell crossing the Iur interface cannot stay in an active set if the UE is using the E-FDPCH. The following rules are used:


11

Enhanced F-DPCH



If all the neighboring cells of the DRNC configured on the SRNC support the E-FDPCH, the SRNC sends the F-DPCH Slot Format Support Request IE to the DRNC through the Radio Link Setup Request message or the Radio Link Reconfiguration Preparation message. And then the SRNC sends the F-DPCH slot format fed back by the DRNC to the UE.



If not all the neighboring cells of the DRNC configured on the SRNC support the E-FDPCH, the SRNC does not send the F-DPCH Slot Format Support Request IE, and all the neighboring cells of the DRNC are regarded as cells with the F-DPCH.



If there is a radio link on the DRNC which is using the E-FDPCH, and if a new radio link to be added on the DRNC does not support the E-FDPCH, the cell cannot be added to the active set.



If there is a radio link on the DRNC which is using the F-DPCH, and if a new radio link to be added does not support the E-FDPCH, the radio link can only use the F-DPCH.



If the E-FDPCH is used by the UE, and if a new radio link to be added supports neither the E-FDPCH nor the F-DPCH, the cell cannot be added to the active set.



For a neighboring cell of the DRNC which is not configured on the SRNC, if the value of the cell’s F-DPCH Support Indicator in Cell Capability Container FDD fed back through the Iur interface is ―Support‖, the cell is regarded as a cell which supports the F-DPCH; otherwise, the cell is regarded as a cell which does not support the F-DPCH. If the value of the c ell’s F-DPCH Slot Format Support Indicator in Cell Capability Container FDD fed back through the Iur interface is

―Support‖, the cell is regarded as a cell which supports the E-FDPCH; otherwise, the cell is regarded as a cell which does not support the E-FDPCH.


12

Enhanced F-DPCH

4

Parameters and Configurations

4.1

ZWF26-01-010 Enhanced F-DPCH Table 4-1

Parameter List

Parameter Name

GUI Name

RNC Enhanced UHspa.rncEfd F-DPCH pchSupInd

Support Indicator

UUtranCellFD D.efdpchSupI nd

Cell Enhanced F-DPCH Support Indicator Neighboring

Parameter Description This parameter indicates whether the RNC supports the Enhanced F-DPCH or not. This parameter indicates whether the cell supports Enhanced F-DPCH or not. This parameter

UExternalUtra Cell Enhanced

indicates whether

nCellFDD.eFd F-DPCH

the neighboring cell

pchSupInd

Support

supports Enhanced

Indicator

F-DPCH.

Indicator for

This parameter

Whether to

indicates whether to

UHspa.event1 Judge Event 1F udge event 1F fHsInd

it

0: Not Supported N/ 1:

A

Supported

0: Not Supported N/ 1:

A

Supported

0: Supported N/ 1: Not

A

Supported

0: False

Condition When condition when the 1: True the Service is

Un

Range

N/ A

Default

Recommend ation

0: Not Support 1: Supported ed



0: False 0: False

service is setup on

Setup on HSPA HSPA.


13

Enhanced F-DPCH

0: Forced to CELL_DC H and Using DCH/DCH Low Rate Signalling 1: Forced to CELL_DC H and Using DCH/DCH with 13.6k Signalling 2: Forced to FACH 3: Not Forced, Using DCH/DCH with DCH/DCH Low Rate Signalling on Cell_DCH State Type of

This parameter

Transport

indicates the type of

URncFunction Channel for

transport channel

.initRrcOnDch Initial RRC

and signaling rate

Connection

for initial RRC

Setup

connection setup.

4: Not Forced, Using

Forced to CELL_D Forced to CH and CELL_DCH

N/ Using and Using DCH/DCH A DCH/D DCH/DCH with 13.6k CH with with 13.6k Signalling 13.6k Signalling on Signallin Cell_DCH g State 5: Forced to CELL_DC H and Using DCH/DCH


with 27.2k Signalling 6: Not

14

Enhanced F-DPCH

5

Related Counters and Alarms

5.1

Related Counters Table 5-1

Counter List

Counter No.

Description

C310424276

Summation Number of Code Node Used, SF=256

C310424283~C31042

Distribution Of Code Node Occupied, SF=256

4314 C310032024

Number of E-FDPCH users in the best cell

C310032025

Average Number of E-FDPCH users in the best cell

C310032028

Number of E-FDPCH users in the non best cell

C310032029

Average Number of E-FDPCH users in the non best cell

C310032022

Number of F-DPCH users in the best cell

C310032023

Average Number of F-DPCH users in the best cell

C310032026

Number of F-DPCH users in the non best cell

C310032027

Average Number of F-DPCH users in the non best cell

C310030436

Number of including only HSDPA users in the best cell

C310030448

Max Number of including only HSDPA users in the best cell

C310030460

Average Number of including only HSDPA users in the best cell

5.2

Related Alarms This feature has no related alarm.


15

Enhanced F-DPCH

6

Engineering Guide

6.1

Application Scenario 1.

Scenarios for Enabling the E-FDPCH

One F-DPCH can be used by up to 10 users in time-multiplex mode and downlink channelization code resources are saved, especially after the E-FDPCH is introduced in 3GPP Rel-7, the code utilization during a soft handover is improved. As a result of the code saving on the F-DPCH, the number of HS-DPSCHs is increased, and the average throughput and the user experience are improved. So it is recommended to activate this feature after HSDPA is deployed. The E-FDPCH feature developed by ZTE is compatible with the UEs supporting the F-DPCH in Rel-6. 2.

Precautions for Enabling the E-FDPCH

Because there may be compatibility issues from some UEs, it is recommended to activate this feature in several cells first. If it is confirmed that there is no UE with compatibility issues, this feature can be activated in the entire network, otherwise it cannot be deployed in the network.

6.2

Feature Activation Procedure The procedure describes how to find the GUI location of the parameters that are related to the deployment of this feature. The values indicated by the captures may be not the real value to be configured. For the real configuration value, refer to the last column of the table in chapter 4. In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration > External Resource Configuration > External RNC Function and double-click External UTRAN Cell, and set Neighboring Cell Enhanced F-DPCH Support Indicator , see Figure 6-1.


16

Enhanced F-DPCH

Figure 6-1

Parameter Configuration Interface —1

In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration > Service configuration and double-click Hspa Configuration, and set RNC Enhanced F-DPCH Support Indicator and Indicator for Whether to Judge Event 1F Condition When the Service is Setup on HSPA, see Figure 6-2 and Figure 6-3.


17

Enhanced F-DPCH

Figure 6-2


Figure 6-3


In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration and double-click UTRAN Cell, and set Cell Enhanced F-DPCH Support Indicator , see Figure 6-4.


18

Enhanced F-DPCH


Figure 6-4

In the configuration resource tree, select Modify Area > Managed Element and double-click UMTS Logical Function Configuration, and set Type of Transport Channel for Initial RRC Connection Setup, see Figure 6-5.


Figure 6-5

6.3

Feature Validation Procedure Table 6-1

Feature Validation Procedure

Test Item


Enhanced F-DPCH

19

Enhanced F-DPCH

Test Item

Enhanced F-DPCH 1.

The WCDMA system is ready.

Prerequisit

2.

Cell1 supports HSUPA, HSDPA and DCH.

e

3.

UE1 supports enhanced F-DPCH and resides in Cell1 in Idle mode.

4.

The Enhanced F-DPCH feature is enabled.

1.

Use UE1 to activate a PS call in Cell1.

2.

Start FTP downloading.

3.

Stop FTP downloading and release the call.

1.

The PS call is setup successfully after step 1.

2.

The RNC configures SRBs on HS and indicates the slot format in the Radio

Steps

Bearer Setup message. The following IE should be present:

Expected

fdpch_SlotFormatPresent = 1

Result

fdpch_SlotFormat = 0..9

6.4

3.

Data transfer is normal after step 2.

4.

The call is released normally after step 3.

Feature Deactivation Procedure Table 6-2

RNC Parameter List—2

Managed Object. Logic Name

GUI Name

Default

Deactivation

Value

Value

RNC Enhanced UHspa.rncEfdpchSupInd

F-DPCH Support

0: Off

0: Off

0: Off

0: Off

Indicator Cell Enhanced UUtranCellFDD.efdpchSupInd

F-DPCH Support Indicator

For a description and configuration of the above parameters, refer to 6.2 Feature Activation Procedure.


20

Enhanced F-DPCH

6.5

Network Impact 1.

Equipment Performance

None 2.

Network KPI

Activating this feature, the advantage is: Because of the restriction that the TPC from different cells for a given UE must have the same offset timing during a soft handover is removed for the E-FDPCH, the multiplexing of code resources increases, more downlink channelization codes are saved, and the average throughput and the user experience are improved. The possible disadvantages are as follows: 

Because the downlink Pilot of DPCCH is removed and the mechanism for the reliability of TPC commands between the F-DPCH and the DPCH is different, and the UE combines the different slot formats for TPC, the RTWP may be raised.



Because there are compatibility issues from some UEs, the following KPIs may be deteriorated: CS RAB setup success rate (caused by concurrent PS services and CS services with the PS services set up first), PS RAB setup success rate, and PS call drop rate.

7

Abbreviation Abbreviation

Full Name

DPCCH

Dedicated Physical Control Channel

E-FDPCH

Enhanced Fractional Dedicated Physical Channel

F-DPCH

Fractional Dedicated Physical Channel

P-CPICH

Primary CPICH

SRB

Signaling Radio Bearer


21

Enhanced F-DPCH

8

References [1] R1-062672 [2] ZTE UMTS F-DPCH & SRB over HSDPA Feature Guide [3] ZTE UMTS Code Resource Allocation Feature Guide [4] ZTE UMTS Handover Control Feature Guide [5] ZXUR 9000 UMTS(V4.13.10.15)Radio Network Controller Radio Parameter Reference [6] ZXUR 9000 UMTS(V4.13.10.15)Radio Network Controller Ground Parameter Reference [7] ZXUR 9000 UMTS(V4.13.10.15)Radio Network Controller Performance Counter Reference [8] ZXWR RNC(V3.13.10.15)Radio Network Controller Radio Parameter Reference [9] ZXWR RNC(V3.13.10.15)Radio Network Controller Ground Parameter Reference [10] ZXWR RNC(V3.13.10.15)Radio Network Controller Performance Counter Reference


22

Enhanced F-DPCH Feature Guide

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