zgo-03!02!009 flexible priority handling of packet data channel fg 20101030

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ZGO-03-02-009 Flexible Priority

Handling of Packet DataChannel

Feature Guide


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ZGO-03-02-009 Flexible Priority Handling of Packet Data Channel

ZTE Confidential Proprietary 2010 ZTE CORPORATION. All rights reserved. I

ZGO-03-02-009 Flexible Priority Handling of Packet Data

Channel

Version Date Author Approved By Remarks

V1.00 2010-10-30 Not open to the Third Party

2010 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL:This document contains proprietary information of ZTE and is not to bedisclosed or used without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information in this document issubjected to change without notice.


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ZTE Confidential Proprietary 2010 ZTE CORPORATION. All rights reserved. II

TABLE OF CONTENTS

1 Feature Attribute ............................................................................................. 12 Overview ......................................................................................................... 12.1 Feature Introduction .......................................................................................... 12.2 Correlation with Other Features ........................................................................ 23 Technical Description .................................................................................... 24 Parameter and Configuration ........................................................................ 34.1 Parameter List .................................................................................................. 34.2 Parameter Configurations ................................................................................. 45 Related Counters and Alarms ........................................................................ 55.1 Related Counters .............................................................................................. 55.2 Related Alarms ................................................................................................. 56 Engineering Guide .......................................................................................... 56.1 Application Scenario ......................................................................................... 56.2 Configuration Description.................................................................................. 66.3 Network Impact ................................................................................................. 67 Abbreviation .................................................................................................... 68 Reference Document ...................................................................................... 6


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ZTE Confidential Proprietary 2010 ZTE CORPORATION. All rights reserved. III

FIGURES

Figure 4-1 Configuration interface 1 of Flexible Priority Handling of Packet Data Channel ... 4Figure 4-2 Configuration interface 2 of Flexible Priority Handling of Packet Data Channel ... 5

TABLES

Table 4-1 Parameter List ...................................................................................................... 3


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ZTE Confidential Proprietary 2010 ZTE CORPORATION. All rights reserved. 1

1 Feature Attribute

iBSC Version: [iBSC V6.20]

BTS Version: [Independent of BTS hardware platform]

Property: [Optional function]

Related Network Element

NE Name Involved Or Not Special Requirement

MS

BTS -

BSC

MSC -

MGW -

SGSN -

GGSN -

HLR -

Dependent Function: [None]

Mutual Exclusion: [None]

Note: [None]

2 Overview

2.1 Feature Introduction

This feature enables flexible priority configuration of data channels and correspondingly

Packet Data Channel with priority control is introduced. These PDCHs can be used by

voice services when they are idle and used to carry data services when data traffic is

busy. In this way, packet data bandwidth is guaranteed without use of fixed packet data


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channels. Originally GPRS and EGPRS users always have lower priorities of control

channels than CS users. In other words, CS calls can preempt the channels that are

carrying data services if there is no idle channel in cells.

2.2 Correlation with Other Features

According to the PDCH priority attribute of timeslot, the PDCH with PDCH Priority are

preempted during PS service request the Traffic Channels (TCHs) with Non-PDCH

Priority are preempted during CS application; the TCHs with PDCH Priority are

preferentially migrated during CS defragmentation and channel migration activities.

Related documents are as follows:

ZGO-03-02-011 Channel Repacking

ZGO-03-02-002 Enhancement on Channel Allocation

3 Technical Description

The priority of data channels on radio timeslots can be flexibly configured. This attribute

is set to Non-PDCH-Priority by default, which means voice services have a priority in

using this data channel as TCH on radio timeslots. If this attribute is set to PDCH

Priority, data services have a priority in using the DCHs on radio timeslots.

When MS requests a voice service, radio resources are allocated in the sequence of

Non-PDCH Priority to PDCH Priority based on the timeslot. That is, TCHs on

Non-PDCH Priority timeslots are preferentially allocated, and when hey are all occupied,

the TCHs on PDCH-priority timeslots are then allocated.

When MS requests a data service, the channel combination allocation principle is as

follows: In this channel combination considering max channels with PDCH priority or to

be activated), but including minimum the Non-PDCH Prioritychannels, the better. For

details, see section 10 and section 11 regarding PDTCH allocation in Enhancement on

Channel Allocation.


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During defragmentation, the system will defragment the channels in the sequence of

PDCH Priority to Non-PDCH Priority based on the timeslot attribute. Among all PDCH

Priorityfragment channels, locate the fragment channel with best PDCH continuity after

outgoing migration of services. If there is no PDCH Priorityfragment channel, traverse

all Non-PDCH Priority fragment channels to allocate the fragment channel with best

PDCH continuity if the services was migrated out of the fragment channel.

Similarly, during CS migration, traverse the occupied channels in the sequence of PDCH

Priority to Non-PDCH Priority based on timeslot attribute. Among all PDCH Priority

channels, locate the channel with best PDCH continuity after outgoing migration of

services. If there is no PDCH Priority channel, traverse all Non-PDCH Priority

channels to locate the channel with best PDCH continuity after outgoing migration of

services.

4 Parameter and Configuration

4.1 Parameter List

Table 4-1 Parameter List

Full name PDCH Priority

Abbreviation PDCHPrecedence

DescriptionThis timeslot is used as PDTCH firstly. It is only con-

figured for dynamic timeslot.

Value Range Yes/No

Unit None

Default No

Management Object TRX


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4.2 Parameter Configurations

In the configuration resource tree window, select [OMC->GERAN Subnetwork->BSC

Managed Element->Config Set->BSC Function->Site Config->BTS ID ->Cell

ID], and double-click [Transceiver ID]. In the displayed [Transceiver] window, select the

[Channel Information] tab and set PDCH Preference Property as shown in the

following figure.

Figure 4-1 Configuration interface 1 of Flexible Priority Handling of Packet Data

Channel

Click [Cell ID], and set [GPRS Channel Schedule parameters] in [GPRS Channel] in

pop-up [Cell ID] window:


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Figure 4-2 Configuration interface 2 of Flexible Priority Handling of Packet Data

Channel

5 Related Counters and Alarms

5.1 Related Counters

None

5.2 Related Alarms

None

6 Engineering Guide

6.1 Application Scenario

This feature is applicable to all the scenarios. Due to flexible channel configurations,

channels can be used by voice services when data traffic is idle, but are preempted to

carry data services in the case of busy data traffic. As thus, packet data bandwidth is

guaranteed without use of packet data channels, and the access rate of data user is also


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improved. This feature can be adopted in areas with large crow mobility and density or an

apparent difference between the peak and off-peak hours, such as business areas,

airports, railway stations, and bus stations.

6.2 Configuration Description

This feature does not involve the adjustment of iBSC or BTS hardware configuration.

6.3 Network Impact

This feature can improve the utilization of voice and data channels, guarantee the data

service resources to some extent, and enhance the TBF link setup success rate and

throughput rate. In the case of resource congestion, excessive PDCHs may lead to a rise

of voice service congestion rate, so you need to strike a balance between the number of

PDCHs and the congestion rate during configuration.

7 AbbreviationAbbreviations Full Characteristics

3GPP 3rd Generation Partnership Project

GSM Global System for Mobile communications

BSC Base Station Controller

BTS Base Transceiver Station

MS Mobile Station

MSC Mobile Switching Centre

PDCH Packet Data Channel

PDTCH Packet Data Traffic Channel

TCH Traffic Channel

8 Reference Document

[None]

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