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OPEN BASE STATIONARCHITECTURE INITIATIVE

BTS SYSTEM REFERENCE DOCUMENTVersion 2.0

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FOREWORD

OBSAI description and specification documents are developed within

the Technical Working Group of the Open Base Station ArchitectureInitiative Special Interest Group (OBSAI SIG). Members of the OBSAITWG serve voluntarily and without compensation. The description andspecifications developed within OBSAI represent a consensus of thebroad expertise on the subject within the OBSAI SIG.

The OBSAI SIG uses the following terminology in the specifications:

"shall" expresses a provision that is binding

"should" and "may" expresses non-mandatory provisions

"will" expresses a declaration of purpose on the part of the

OBSAI SIG. It may be necessary to use "will" in cases where thesimple future tense is required

Use of an OBSAI reference or specification document is whollyvoluntary. The existence of an OBSAI Specification does not imply thatthere are no other ways to produce, test, measure, purchase, market,or provide other goods and services related to the scope of the OBSAISpecification. Furthermore, the viewpoint expressed at the time aspecification is approved and issued is subject to change brought aboutthrough developments in the state of the art and comments receivedfrom users of the specification. Every OBSAI Specification is subjectedto review in accordance with the Open Base Station Architecture

Initiative Rules and Procedures.

Implementation of all or part of an OBSAI Specification may requirelicenses under third party intellectual property rights, including withoutlimitation, patent rights (such a third party may or may not be an OBSAIMember). The Promoters of the OBSAI Specification are notresponsible and shall not be held responsible in any manner foridentifying or failing to identify any or all such third party intellectualproperty rights.

The information in this document is subject to change without noticeand describes only the product defined in the introduction of thisdocumentation. This document is intended for the use of OBSAIMembers customers only for the purposes of the agreement underwhich the document is submitted, and no part of it may be reproducedor transmitted in any form or means without the prior written permissionof OBSAI Management Board. The document has been prepared foruse by professional and properly trained personnel, and the customerassumes full responsibility when using it. OBSAI Management Board,Marketing Working Group and Technical Working Group welcomecustomer comments as part of the process of continuous developmentand improvement of the documentation.

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The information or statements given in this document concerning thesuitability, capacity, or performance of the mentioned hardware orsoftware products cannot be considered binding but shall be defined in

the agreement made between OBSAI members. However, the OBSAIManagement Board, Marketing Working Group or Technical WorkingGroup have made all reasonable efforts to ensure that the instructionscontained in the document are adequate and free of material errors andomissions.

OBSAI liability for any errors in the document is limited to thedocumentary correction of errors. OBSAI WILL NOT BERESPONSIBLE IN ANY EVENT FOR ERRORS IN THIS DOCUMENTOR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL(INCLUDING MONETARY LOSSES), that might arise from the use of

this document or the information in it.

This document and the product it describes are considered protectedby copyright according to the applicable laws. OBSAI logo is aregistered trademark of Open Base Station Architecture InitiativeSpecial Interest Group. Other product names mentioned in thisdocument may be trademarks of their respective companies, and theyare mentioned for identification purposes only. Copyright Open BaseStation Architecture Initiative Special Interest Group. All rightsreserved. Users are cautioned to check to determine that they have thelatest edition of any OBSAI Specification.

Interpretations: Occasionally questions may arise regarding themeaning of portions of standards as they relate to specific applications.When the need for interpretations is brought to the attention of OBSAI,the OBSAI TWG will initiate action to prepare appropriate responses.Since OBSAI Specifications represent a consensus of OBSAIMembers interests, it is important to ensure that any interpretation hasalso received the concurrence of a balance of interests. For this reasonOBSAI and the members of its Technical Working Groups are not ableto provide an instant response to interpretation requests except in thosecases where the matter has previously received formal consideration.

Comments on specifications and requests for interpretations should beaddressed to:

Peter Kenington

Chairman, OBSAI Technical Working Group

Linear Communications Consultants Ltd.

Email: pbk@linearcomms.com

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Contents

1 Summary of changes ...................................................................................13

2 Scope.............................................................................................................15

3 Reference Architecture ................................................................................16

3.1 Open Architecture Objectives.........................................................................16

3.2 Architecture Overview.....................................................................................16

3.3 Architecture Configurations ............................................................................18

3.4 Block Functional Specifications ......................................................................19

3.4.1 Transport Block (TB).......................................................................................203.4.2 Control and Clock Block (CCB).......................................................................23

3.4.3 Baseband Block..............................................................................................25

3.4.4 RF Block.........................................................................................................42

3.4.5 General Purpose Block...................................................................................46

3.4.6 Power System Unit (PSU) Block.....................................................................48

3.5 OAM&P Principles and Architecture ...............................................................48

3.5.1 Overview of OAM&P support..........................................................................49

3.5.2 OAM&P Implementation Concept ...................................................................50

3.5.3 OAM&P BTS Information Model .....................................................................52

3.6 Addressing Principles .....................................................................................53

3.6.1 MAC Address Assignment..............................................................................53

3.6.2 IP Address Assignment ..................................................................................55

3.6.3 IPv6 Address Assignment...............................................................................55

3.6.4 IPv4 Address Assignment...............................................................................56

3.6.5 Addressing Of Software Resources................................................................563.7 Synchronization..............................................................................................57

3.8 BTS Start-up and Hot Insertion/Removal Principles.......................................58

3.8.1 Concepts and Definitions................................................................................59

3.8.2 Principles for DA-based Implementation.........................................................60

3.8.3 Principles for DA-less Implementation............................................................62

3.9 Redundancy and Availability Criteria ..............................................................66

3.9.1 N+1 Redundancy............................................................................................66

3.9.2 RP1 and RP2 Ethernet Redundancy Principles..............................................66

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3.10 Mechanical and Dimensioning Requirements.................................................68

3.10.1 Overview.......................................................................................