ater interface 41 multiplexing

Ater Interface 4:1 Multiplexing Feature Parameter Description

Copyright © Huawei Technologies Co., Ltd. 2010. 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.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

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 all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied.

Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd

BSS Ater Interface 4:1 Multiplexing Contents

Issue 01 (2010-01-12) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

Ltd

iii

Contents 1 Introduction ................................................................................................................................1-1

1.1 Scope ............................................................................................................................................ 1-1 1.2 Intended Audience ........................................................................................................................ 1-1 1.3 Change History.............................................................................................................................. 1-1

2 Overview .....................................................................................................................................2-1

3 Technical Description ..............................................................................................................3-1

4 Networking..................................................................................................................................4-1

5 Parameters .................................................................................................................................5-1

6 Counters......................................................................................................................................6-1

7 Glossary ......................................................................................................................................7-1

8 Reference Documents .............................................................................................................8-1

BSS Ater Interface 4:1 Multiplexing 1 Introduction


Ltd

1-1

1 Introduction 1.1 Scope This document describes the principles of Ater Interface 4:1 Multiplexing.

1.2 Intended Audience This document is intended for:

Personnel who need to understand Ater Interface 4:1 Multiplexing Personnel who work with Huawei products

1.3 Change History This section provides information on the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change Feature change refers to the change in the Ater Interface 4:1 Multiplexing feature of a specific product version.

Editorial change Editorial change refers to the change in wording or the addition of the information that was not described in the earlier version.

Document Issues The document issues are as follows:

01 (2010-01-12)

01 (2010-01-12) This is the first commercial release of GBSS9.0.

BSS Ater Interface 4:1 Multiplexing 2 Overview


Ltd

2-1

2 Overview The transmission cost is very high in network deployment. Operators seek proper technologies to decrease the required transmission bandwidth, therefore reducing the transmission cost. Meanwhile, the transmission quality must be guaranteed.

To achieve that purpose, Ater interface multiplexing is introduced and the BM/TC separated mode is applied. That is, multiplexing on the Ater interface is implemented when the TC is configured on the MSC side. In this manner, the transmission cost is reduced significantly.

Huawei BSC supports 4:1 multiplexing on the Ater interface by means of the TC (TRAU). That is, the four timeslots on the E1 of the A interface can be multiplexed onto a timeslot on the Ater interface by means of the TC. In this process, the previous PCM frame of 64 kbit/s can be converted into the TRAU frame of 16 kbit/s, and therefore reducing the required transmission bandwidth..

BSS Ater Interface 4:1 Multiplexing 3 Technical Description


Ltd

3-1

3 Technical Description In the telephone exchange network, the voice coding scheme is Pulse Code Modulation (PCM) and the rate is 64 kbit/s. According to GSM specifications, PCM must be applied on the A interface.

To save the radio channel resources, data transmission between the MS and the BTS adopts the voice coding scheme RPE-LTP or CELP whose rate is 13 kbit/s (16 kbit/s for transmission) or other coding schemes with an even lower rate(for example, 8 kbit/s). If a call service attempts to be set up between the MS and the MSC, the voice codec is converted from 13 kbit/s codec to 64 kbit/s codec. The voice codec conversion is implemented in the TC (TRAU) unit. Before the conversion, the voices are exchanged and transmitted on the 16-kbit/s channels in the BSC. The Ater interface is an internal interface between the TC processing unit and the service processing module (BM). Figure 3-1 shows the interfaces between network elements (NEs).

Figure 3-1 Interfaces between NEs

On the Ater interface, Huawei BSC supports 4:1 multiplexing. That is, the four timeslots on the E1 of the A interface can be multiplexed onto a timeslot on the Ater interface. Figure 3-2 shows 4:1 multiplexing on the Ater interface.

Figure 3-2 4:1 multiplexing on the Ater interface

On the Ater interface, Huawei BSC supports the multiplexing of four voice channels to an E1 timeslot of 64 kbit/s. When the TC subrack is configured on the MSC side, the remote transmission resource can be saved by 75%.

Huawei introduces a new feature of resource pool and integrates it into the BSC. With this feature, links on the Ater interface work in resource pool mode and can be inconsistent with the CICs on the A interface. This improves the network reliability.

The resources on the Ater interface involve the timeslots of 16 kbit/s and 8 kbit/s. When a call connection is established, according to the service type, the Ater timeslots of 16 kbit/s are used if the TCHs/F are allocated on the Um interface; the Ater timeslots of 8 kbit/s are used if the TCHs/H are allocated on the

3 Technical Description BSS

Ater Interface 4:1 Multiplexing

3-2 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.,

Ltd

Issue 01 (2010-01-12)

Um interface. In this way, the resources on the Ater interface can be fully utilized and the resources can be saved by over 75%.

BSS Ater Interface 4:1 Multiplexing 4 Networking


Ltd

4-1

4 Networking Huawei provides a flexible networking solution for operators. That is, the TC can be configured on either the BSC side or the MSC side.

Ater Interface 4:1 Multiplexing can be used together with TC pool.

Ater Interface 4:1 Multiplexing can be used on the TDM-based A interface but not on the IP-based A interface.

The transmission resources on the TDM-based Ater interface are planned to be 25% of the total interface transmission capacity.

BSS Ater Interface 4:1 Multiplexing 5 Parameters


Ltd

5-1

5 Parameters None.

BSS Ater Interface 4:1 Multiplexing 6 Counters


Ltd

6-1

6 Counters None.

BSS Ater Interface 4:1 Multiplexing 7 Glossary


Ltd

7-1

7 Glossary For the acronyms, abbreviations, terms, and definitions, see the Glossary.

BSS Ater Interface 4:1 Multiplexing 8 Reference Documents


Ltd

8-1

8 Reference Documents 3GPP TS 48.002: "Base Station System - Mobile-services Switching Centre (BSS - MSC) interface; Interface principles"

GBSS9.0 BSC6900 Basic Feature List GBSS9.0 BSC6900 Basic Feature Description