1、 TIA/EIA STANDARD Cellular Digital Packet Data (CDPD) System Specification Mobility Management TIA/EIA-732-500 (Upgrade of TIA/EIA/IS-732-500) JULY 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of ANSI/TIA/EIA-732-500-20
2、01 Approved: June 8, 2001 TIA/EIA-732-500 NOTICE TIA/EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchas
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5、stitute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. This Standard does not purport to address all safety problems associated with its use or all applicable
6、 regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal No. 4033-500-UG, formulated under the cognizance of the TIA TR-45
7、.6 Subcommittee on Adjunct Data Packet Wireless Technology.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2001 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to current Catalog of EIA ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERING
8、PUBLICATIONS or call Global Engineering Documents, USA and Canada (1-800-854-7179) International (303-397-7956) All rights reserved Printed in U.S.A. PLEASE! DONT VIOLATE THE LAW! This document is copyrighted by the TIA and may not be reproduced without permission. Organizations may obtain permissio
9、n to reproduce a limited number of copies through entering into a license agreement. For information, contact: Global Engineering Documents 15 Inverness Way East Englewood, CO 80112-5704 or call U.S.A. and Canada 1-800-854-7179, International (303) 397-7956 500iTIA/EIA-732-50012345678910111213141516
10、1718192021222324252627282930313233343536373839404142434445464748495051525354555657585960Contents1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500-12 Overview of Mobility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11、. . . . . . . . 500-12.1 Cells, Areas and Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-12.2 Mobility Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-33 M
12、obility Management and Network Elements . . . . . . . . . . . . . . . . . . 500-43.1 Mobile End System (M-ES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-43.2 Mobile Data Intermediate System (MD-IS) . . . . . . . . . . . . . . . . . . . . .
13、. . . . . . . . . . . . . . . .500-43.2.1 Mobile Home Function (MHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-43.2.2 Mobile Serving Function (MSF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-54 Cell Transf
14、er and Location Update . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500-54.1 Criteria for Cell Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-54.2 Intra-Area Cell Transfer . . . . . . . . . . . . . . . . . . . . . . . .
15、. . . . . . . . . . . . . . . . . . . . . . . . . . . .500-64.3 Inter-Area Cell Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-75 Redirection and Forwarding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500-86
16、Mobility Support for Multicast Group Services . . . . . . . . . . . . . . . . . 500-96.1 Multicast NSAP-Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-106.2 Multicast Group Server . . . . . . . . . . . . . . . . . . . . . . . . . . .
17、. . . . . . . . . . . . . . . . . . . . . . . . .500-106.2.1 Registration and Location Update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-116.3 Replication, Redirection and Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
18、0-116.3.1 Home Area Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-116.3.2 Serving Area Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500-11TIA/EIA-732-500500ii1234567891011
19、12131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960500iii123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960TIA/EIA-732-500PART 500 Mobility ManagementForewordThis foreword is not part of the S
20、tandardThis Standard has been produced by the TR-45.6 Subcommittee of the TIA/EIA/TR-45 Committee.This document contains significant portions of material originally submitted by the Cellular Digital Packet Data Forum Inc.This document set constitutes the Cellular Digital Packet Data (CDPD) System Sp
21、ecification. CDPD is a technology intended to provide packet data networking services to mobile hosts. The media used to provide these services consists of radio channels typically used for Advanced Mobile Phone System (AMPS) cellular service.Document StructureThis Standard is published as a series
22、of Parts. Each Part contains information pertaining to one aspect of the system.The functional structure of the Cellular Digital Packet Data System Specification is as follows:a71 Introduction and OverviewTIA/EIA-732-500 Mobility Management500iv1234567891011121314151617181920212223242526272829303132
23、33343536373839404142434445464748495051525354555657585960This document provides an overview of the CDPD Network and serves as a guide to the remainder of the system specification for specific detailed information.In this Part, design objectives are described and are followed by the design concepts us
24、ed to realize the stated objectives. The resultant network is then described in terms of its external interfaces, major network elements and network services. A listing of key identifiers in CDPD is then followed by a comprehensive glossary of CDPD terms and a reference list of non-CDPD documents.Th
25、is Part contains the detailed listing of all Parts of the Cellular Digital Packet Data Specifications.a71 Part 300 to Part 799Protocols and InterfacesThese Parts form the heart of the CDPD System Specification. They define the communications architecture of CDPD, including communications layer entit
26、ies, services, protocol stacks, the three key interfaces, Radio Resource Control, Mobility Management, Accounting Management, Support Services and Network Management.a71 Part 800 to Part 899Supplementary Protocol InformationThese Parts contain further specification of the primary CDPD protocols. Sta
27、te transition matrices are used to define protocol state machines, and Protocol Implementation Conformance Statements (PICS) are provided for implementors.a71 Part 900 to Part 999Protocol Test SpecificationsFollowing an overview of protocol testing, these Parts contain Abstract Test Suites (ATSs) an
28、d Protocol Implementation eXtra Information for Test (PIXIT) for the protocols specified in Part 300 to Part 799.a71 Part 1000 to Part 1999Guidelines for Service ProvidersThese Parts describe guidelines for CDPD Service Providers.5001123456789101112131415161718192021222324252627282930313233343536373
29、839404142434445464748495051525354555657585960Introduction TIA/EIA-732-500PART 500 Mobility Management1 IntroductionThis Part describes the architecture, services and protocols for managing mobility in a CDPD Network.One of the unique attributes of the CDPD Network is that Mobile End Systems (M-ESs)
30、change their subnetwork point of attachment (SNPA) at will, and thus traditional forms of network connectivity and routing may not be used because their location (and therefore the route to reach them) may not be deduced from their network address.Mobility management is concerned with the maintenanc
31、e of a location information database and routing of Network Protocol Data Units (NPDUs) based on this information. A closely related function is that of radio resource management, which is concerned with the discovery, selection and use of the most optimal radio channel available to the M-ES.2 Overv
32、iew of Mobility2.1 Cells, Areas and DomainsThe geographic area over which CDPD Network service is available is subdivided into cells, areas and domains.TIA/EIA-732-500 Mobility Management50021234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859
33、60A cell is defined by the geographic area covered by a single Mobile Data Base Station (MDBS) or, in the case of sectorized cells, the coverage area of the sector. In any given cell or sector, there may be zero, one or more physical channels available for CDPD service. An MDBS may control multiple
34、cells.An MDBS is under the control of a single Mobile Data Intermediate System (MD-IS). The combined geographic coverage of all MDBSs under the control of a single MD-IS defines a routing area subdomain, as shown in Figure 500-1. This serving area may cover multiple Cellular Geographic Service Areas
35、 (CGSA) or it may be only part of a single CGSA. Mobility within a routing area subdomain uses different mechanisms than mobility between routing area subdomains.A CDPD domain is defined by the set of MD-ISs operated and administered by a single CDPD Service Provider. Mobility between CDPD Service P
36、rovider domains is subject to service agreements between those CDPD Service Providers but, in principle, is no different from mobility between routing areas.In this specification, there is a correspondence between a geographic service area, defined by an MD-IS, and the ISO definition of routing doma
37、ins, as defined in ISO-TR-9575 (OSI Routing Framework) and ISO-10589 (IS-IS Intra-domain Routing Protocol). The MD-IS may be classified as a Level 1 Intermediate System (IS), because it routes directly to End Systems (ESs) within its own area, and routes toward a Level 2 Intermediate System when the
38、 destination is in a different area.FIGURE 500-1 Levels of Mobility Support: Cells, Areas and DomainsMDISMDISMDISISRouting AreaSubdomainESESESExternalSubnetworkDomainISISMDISService Provider YCDPD domainIScellcellcellISService Provider XCDPD domain5003Overview of Mobility TIA/EIA-732-500123456789101
39、1121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859602.2 Mobility FunctionsThe CDPD Network provides transparent mobile interworking, in which the mobility of M-ESs is completely transparent to Transport Layer protocols. The mobility information is manag
40、ed and constrained within MD-ISs so that routing and relaying are transparent to all other systems internal and external to the CDPD Network.Support for mobility is provided at both Data Link Layer and Network Layer in the CDPD Network. a. Data Link Layer support for mobility provides Network Layer
41、transparency over a group of cells forming a single routing domain (i.e., the service coverage area of an MD-IS)b. Network Layer support for mobility provides Transport Layer transparency to mobility over the entire CDPD Network.A key concept in CDPD mobile interworking is that every M-ES is logical
42、ly a member of a fixed home area. The home area provides the anchor or mobility-independent routing destination area for ISs and ESs that are not mobile aware. The CDPD mobility functions provide for rerouting and forwarding messages from the home area to the current location of the M-ES.Mobility ma
43、nagement is composed of three processes:a71 Cell selectionCell selection allows an M-ES to discover, select and maintain the most optimal channel available. When an M-ES decides the current channel no longer provides the required level of service, a new channel is selected from those available. Cell
44、 transfer procedures are initiated to notify the network of the change. Cell selection is a function of Radio Resource Management (RRM), described in Part 405.a71 Location updateA distributed location information base is maintained that records the current serving area of each M-ES and is updated as
45、 result of the cell transfer procedures.a71 Redirection and forwardingMessages that are destined for M-ESs are redirected from an MD-IS in the home area by forwarding to the MD-IS at the current serving area. The serving MD-IS completes the delivery by routing to the current cell in which the intend
46、ed M-ES is located.TIA/EIA-732-500 Mobility Management50041234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859603 Mobility Management and Network Elements3.1 Mobile End System (M-ES)Each M-ES is aware of its location (i.e., a cell), based on t
47、he channel stream it is currently using. When the M-ES moves to another cell, it notifies the network by indicating a change to the channel stream used in the new cell. The M-ES registers its NEI with the CDPD Network through the Mobile Network Registration Protocol (MNRP). When registered with the
48、CDPD Network, an M-ES is a (transitory) member of a current serving area subdomain; that is, it has a serving MD-IS.Each M-ES is identified by one or more unique Network Entity Identifiers (NEIs), which are used to route messages to the M-ES. Each NEI has a single home subdomain; that is, the NEI ho
49、me MD-IS. These home subdomains may or may not be the same.When operating in its home area, the serving and home subdomains for an M-ES are the same; they are different when the M-ES is outside its home area.3.2 Mobile Data Intermediate System (MD-IS)MD-ISs perform routing functions based on additional knowledge of the current location of M-ESs. MD-ISs are the only network-relay systems that have any knowledge of mobility and operate a CDPD-specific Mobile Network Location Protocol (MNLP) to exchange location information.The MD-IS performs two distinct mobility routing funct
