Rru redundancy description

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RAN RRU Redundancy Description Issue 01 Date 2009-03-30 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd

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  1. 1. Error! Unknown document property name. RAN RRU Redundancy Description Issue 01 Date 2009-03-30
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  3. 3. Error! Unknown document property name. Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. For any assistance, please contact our local office or company headquarters. 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 Huawei Technologies Co., Ltd.2009. 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, expressed or implied.
  4. 4. Error! Unknown document property name. Error! Unknown document property name. About This Document Issue Error! Unknown document property name. (Error! Unknown document property name.) Error! Unknown document property name. v About This Document Author Prepared by Xu Xuhua Date 2009-02-25 Edited by Wang Qian Date 2009-03-12 Reviewed by Xu Xuhua, Liu Bing, and Tang Wenqing Date 2009-03-11 Translated by Liu Yong Date 2009-03-17 Tested by You Yiqing Date 2009-03-18 Approved by Li Qiang Date 2009-03-30
  5. 5. Error! Unknown document property name. Error! Unknown document property name. Contents Issue Error! Unknown document property name. (Error! Unknown document property name.) Error! Unknown document property name. vii Contents 1 Change History..............................................................................................................................1 2 Introduction....................................................................................................................................1 3 Technical Description ..................................................................................................................1 3.1 Transmit Diversity + MIMO ............................................................................................................................................1 3.1.1Automatic NodeB Operations In the Case of the Faulty TX Channel............................................................1 3.1.2Automatic NodeB Operations After the TX Channel is Restored...................................................................2 3.2 No Transmit Diversity.......................................................................................................................................................2 4 Implementation .............................................................................................................................1 4.1 Transmit Diversity + MIMO ............................................................................................................................................1 4.2 No Transmit Diversity.......................................................................................................................................................2 5 RRU Redundancy Parameters ....................................................................................................1 5.1 Description..........................................................................................................................................................................1 5.2 Values and Ranges.............................................................................................................................................................3 6 Reference Documents...................................................................................................................1
  6. 6. Error! Unknown document property name. Error! Unknown document property name. 1 Change History Issue Error! Unknown document property name. (Error! Unknown document property name.) Error! Unknown document property name. 1 1 Change History The change history provides information on the changes in different document versions. Document and Product Versions Table 1-1 Document and product versions Document Version RAN Version 01 (2009-03-30) 11.0 The available time of each feature is subject to the RAN product roadmap. There are two types of changes, which are defined as follows: Feature change: refers to the change in the RRU redundancy. Editorial change: refers to the change in the information that was inappropriately described or the addition of the information that was not described in the earlier version. 01 (2009-03-30) This is the document for the first commercial release of RAN11.0.
  7. 7. Error! Unknown document property name. Error! Unknown document property name. 2 Introduction Issue Error! Unknown document property name. (Error! Unknown document property name.) Error! Unknown document property name. 1 2 Introduction Definition A local cell is configured with two TX channels. If one TX channel is faulty, the system automatically switches it to the other TX channel. Purposes In certain remote areas, the RRU maintenance is difficult. In such cases, RRUredundancy plays an important role. RRU redundancy offers a standby TX channelto enhance the reliability and robustness of the RAN network. This feature reduces the period of service disruption caused by the TX channel fault and improves the QoS. Thus, the network coverage of the RRU can be ensured. Product Versions Table 2-1 lists the versions of the products that support RRU redundancy. Table 2-1 Versions of the products supporting RRUredundancy Product BTS3812E BTS3812A/BTS3812 AE DBS3800 BTS3900/BTS 3900A DBS3900 Version V100R010 or later* V100R010 or later* V100R010 or later* V200R010 or later* V200R010 or later* * TheV100R010/V200R010 or a later version supports RRU redundancy in themode of no TX diversity mode. The V100R011/V200R011 or a later version supportsRRU redundancy in TX diversity mode. NOTE
  8. 8. Error! Unknown document property name. Error! Unknown document property name. 2 Introduction Issue Error! Unknown document property name. (Error! Unknown document property name.) Error! Unknown document property name. 2 Terms Table 2-2 Terms Term Definition Diversity reception Radio reception in which a resultant signal is obtained by combining or selecting of signals from two or more independent sources. These sources have been modulated with identical information-bearing signals, but may vary in their fading characteristics at any given instant. Intended Audience This document is intended for: System operators who need a general understanding of RRU redundancy. Personnel working on Huawei products or systems. Network Elements Involved The Network Elements (NEs) involved in RRU redundancy are listed in the following table: Table 2-3 NEs involved in RRU redundancy UE NodeB RNC MSC Server MGW SGSN GGSN HLR NOTE = NE not involved = NE involved UE = User Equipment, RNC = Radio Network Controller, MSC Server = Mobile Service Switching Center Server, MGW= Media Gateway, SGSN = Serving GPRS Support Node, GGSN = Gateway GPRS Support Node, HLR = Home Location Register
  9. 9. Error! Unknown document property name. Error! Unknown document property name. 3 Technical Description Issue Error! Unknown document property name. (Error! Unknown document property name.) Error! Unknown document property name. 1 3 Technical Description RRU (Remote Radio Unit) redundancy means that two TX channels are configured for the RRU in a cell. If a TX channel is faulty, the system automatically switches it to the standby TX channel. During the switchover, the ongoing services are disrupted and the logic cell is re- established. Based on the cell configuration mode, RRU redundancy is classified into the following two modes: Transmit diversity + MIMO (Multiple Input Multiple Output) No transmit diversity 3.1 Transmit Diversity + MIMO When the transmit diversity + MIMO mode is used in the cell, the system is automatically switched to the no transmit diversity or non-MIMO mode if a TX channel is faulty. When the TX channel is restored, the system is automatically switched back to the transmit diversity + MIMO mode. 3.1.1 Automatic NodeB Operations In the Case of the Faulty TX Channel When the transmit diversity is used in the cell, the NodeB performs the following operations if a faulty TX channel is detected: Step 1 The NodeB calculates the maximum available transmit power Ptot for the cells of which the transmit diversity capabilities are changed. The available power of the standby TX channel is the basis for the calculation. Ptot = Maximum available TX power of the standby TX channel TX power assigned for the cells of which the transmit diversity capabilities are not changed on the standby TX channel Step 2 The NodeB determines again the maximum available TX power for each cell of which the transmit diversity capability is changed. The NodeB configures the TX power Pj for each cell of which the transmit diversity capability is changed on the TX channel (Pj = Original TX power of the cell 3 dB). If Ptot Pj > 0, the NodeB assigns the remaining power evenly to the cells of which the transmit diversity capabilities are changed. The available power of each cell, however, must not surpass the maximum power originally configured for the cell.
  10. 10. Error! Unknown document property name. Error! Unknown document property name. 3 Technical Description Issue Error! Unknown document property name. (Error! Unknown document property name.) Error! Unknown document property name. 2 Step 3 The RNC performs the corresponding operations based on the value of Cell Capability Auto Handle Switch. If Cell Capability Auto Handle Switch is not set to TX_DIVERSITY_ON_TO_OFF, the RNC does not send the related command to the NodeB. You can infer that the procedure is complete. If Cell Capability Auto Handle Switch is set to TX_DIVERSITY_ON_TO_OFF and the power meets the condition MaxPower(rnc)