Gsm and Umts Common Cpri Interface(Sran6.0_01)

GSM and UMTS Common CPRI Interface SRAN6.0

Feature Parameter Description

Issue

01

Date

2011-03-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2013. 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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SingleRAN GSM and UMTS Common CPRI Interface

Contents

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

2 Technical Description ..............................................................................................................2-1 3 Parameters..................................................................................................................................3-1 4 Counters ......................................................................................................................................4-1 5 Glossary ......................................................................................................................................5-1 6 Reference Documents .............................................................................................................6-1

Issue 01 (2011-03-30)

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

ii


1 Introduction

1 Introduction 1.1 Scope This document describes multi-mode RRU connections and multi-mode RRU/RFU star-connections with the BBU through GSM/UMTS common CPRI interfaces when the base station works in GSM+UMTS mode (MRFD-210001 Multi-mode BS Common CPRI Interface(GBTS), MRFD-210002 Multi-mode BS RRU/RFU star-connection with separate CPRI interface(GBTS), MRFD-220001 Multi-mode BS Common CPRI Interface(NodeB), MRFD-220002 Multi-mode BS RRU/RFU star-connection with separate CPRI interface(NodeB) ).

1.2 Intended Audience This document is intended for: 

Personnel who are familiar with GSM and WCDMA basics



Personnel who need to understand GSM and UMTS common CPRI interface



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: refers to the change in the GSM and UMTS common CPRI interface feature of a specific product version.



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 (2011-03-30)



Draft A (2010-12-30)

01 (2011-03-30) This is the document for the first commercial release of SRAN6.0. Compared with issue Draft A (2010-12-30) of SRAN6.0, this issue optimizes the description.

Draft A (2010-12-30) This is the draft of the document for SRAN6.0. Compared with issue 01 (2010-10-15) of SRAN5.0, this issue optimizes the description.

Issue 01 (2011-03-30)


1-1


2 Technical Description

2 Technical Description Traditional GSM and UMTS dual-mode applications require that one base station use both the RF modules dedicated to GSM and those dedicated to UMTS. In this case, GSM data and UMTS data are carried on different fiber optic cables on CPRI interfaces. As multi-mode RRUs are developed, the GSM and UMTS common CPRI interface feature becomes applicable. This feature can reduce the demand for the fiber optic cables on CPRI interfaces and therefore, it can lower the corresponding installation and maintenance costs for the fiber optics. The GSM and UMTS common CPRI interface feature can be implemented in the following ways: 

Multi-mode RRU connections with the BBU through shared CPRI interfaces As shown in Figure 2-1, GSM data and UMTS data can share one fiber optic cable on each CPRI interface. The GTMU transfers the UMTS data in both the uplink and downlink directions.

Figure 2-1 Multi-mode RRU connections with the BBU through shared CPRI interfaces

When the BBU and RRUs are connected in the way shown in Figure 2-1, a relatively small quantity of fiber optic cables are required. This connection scheme, however, is not recommended, because of the following disadvantages: 

The UMTS side of the base station is dependent on the GSM side. Damages on the CPRI ports on the GTMU and faults in the GTMU will affect UMTS services.



GSM traffic and UMTS traffic share the CPRI bandwidth.



GSM services and UMTS services interrelate. Therefore, in the case of expansion or evolution on the GSM or UMTS side, there is an impact on the other side.



Multi-mode RRU/RFU star-connections with the BBU through separate CPRI interfaces As shown in Figure 2-2, GSM data and UMTS data are transmitted separately on the CPRI interfaces. In this case, the GSM side and the UMTS side can work concurrently in each RF module without impacts on each other. In addition, this connection scheme spares more CPRI ports on the GTMU for GSM traffic, compared with the connection scheme shown in Figure 2-1.

Issue 01 (2011-03-30)


2-1


2 Technical Description

Figure 2-2 Multi-mode RRU/RFU star-connections with the BBU through separate CPRI interfaces

The connection scheme shown in Figure 2-2 is recommended. According to this scheme, the GSM side and the UMTS side are independent of each other, which facilitate evolution and expansion of the services on either side.

Issue 01 (2011-03-30)


2-2


3 Parameters

3 Parameters There are no specific parameters associated with this feature.

Issue 01 (2011-03-30)


3-1


4 Counters

4 Counters There are no specific counters associated with this feature.

Issue 01 (2011-03-30)


4-1


5 Glossary

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

Issue 01 (2011-03-30)


5-1


6 Reference Documents

6 Reference Documents There are no specific reference documents associated with this feature.

Issue 01 (2011-03-30)


6-1

Gsm and Umts Common Cpri Interface(Sran6.0_01)

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