1、 TIA/EIA STANDARD Cellular Digital Packet Data (CDPD) System Specification Subprofile Concepts TIA/EIA-732-301 (Upgrade of TIA/EIA/IS-732-301) JULY 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of ANSI/TIA/EIA-732-301-20
2、01 Approved: June 7, 2001 TIA/EIA-732-301 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
3、er in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of TIA/EIA from manufacturing or selling products not conforming to such Standards and Publications, nor
4、 shall the existence of such Standards and Publications preclude their voluntary use by those other than TIA/EIA members, whether the standard is to be used either domestically or internationally. Standards and Publications are adopted by TIA/EIA in accordance with the American National Standards In
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. 4033-301-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 301iTIA/EIA-732-30112345678910111213141516
10、1718192021222324252627282930313233343536373839404142434445464748495051525354555657585960Contents1 Communications Network Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301-11.1 Layer Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11、. . . . . . . . . . . . . .301-22 Specification Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301-4TIA/EIA-732-301301ii123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960301iii123456789101112131415161718
12、192021222324252627282930313233343536373839404142434445464748495051525354555657585960TIA/EIA-732-301PART 301 Subprofile ConceptsForewordThis foreword is not part of the StandardThis Standard has been produced by the TR-45.6 Subcommittee of the TIA/EIA/TR-45 Committee.This document contains significan
13、t portions of material originally submitted by the Cellular Digital Packet Data Forum Inc.This document set constitutes the Cellular Digital Packet Data (CDPD) System Specification. CDPD is a technology intended to provide packet data networking services to mobile hosts. The media used to provide th
14、ese services consists of radio channels typically used for Advanced Mobile Phone System (AMPS) cellular service.Document StructureThis Standard is published as a series of Parts. Each Part contains information pertaining to one aspect of the system.The functional structure of the Cellular Digital Pa
15、cket Data System Specification is as follows:a71 Introduction and OverviewTIA/EIA-732-301 Subprofile Concepts301iv123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960This document provides an overview of the CDPD Network and serves as a guid
16、e 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 used to realize the stated objectives. The resultant network is then described in terms of its external interfaces, major network ele
17、ments 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.This Part contains the detailed listing of all Parts of the Cellular Digital Packet Data Specifications.a71 Part 300 to Part 799Proto
18、cols and InterfacesThese Parts form the heart of the CDPD System Specification. They define the communications architecture of CDPD, including communications layer entities, services, protocol stacks, the three key interfaces, Radio Resource Control, Mobility Management, Accounting Management, Suppo
19、rt Services and Network Management.a71 Part 800 to Part 899Supplementary Protocol InformationThese Parts contain further specification of the primary CDPD protocols. State transition matrices are used to define protocol state machines, and Protocol Implementation Conformance Statements (PICS) are pr
20、ovided for implementors.a71 Part 900 to Part 999Protocol Test SpecificationsFollowing an overview of protocol testing, these Parts contain Abstract Test Suites (ATSs) and Protocol Implementation eXtra Information for Test (PIXIT) for the protocols specified in Part 300 to Part 799.a71 Part 1000 to P
21、art 1999Guidelines for Service ProvidersThese Parts describe guidelines for CDPD Service Providers.3011123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960Communications Network Model TIA/EIA-732-301PART 301 Subprofile Concepts1 Communicatio
22、ns Network ModelThe basic structuring technique in the Cellular Digital Packet Data (CDPD) Network communications reference model is layering. Using this technique, communication among application processes is viewed as being logically partitioned into an ordered set of layers represented in a verti
23、cal sequence as shown in Figure 301-1. FIGURE 301-1 Layered Communications ArchitectureApplication LayerPresentation LayerSession LayerTransport LayerNetwork LayerData Link LayerPhysical LayerLayer 7Layer 6Layer 5Layer 4Layer 3Layer 2Layer 1TIA/EIA-732-301 Subprofile Concepts301212345678910111213141
24、51617181920212223242526272829303132333435363738394041424344454647484950515253545556575859601.1 Layer DescriptionsFollowing are brief narratives of the general services provided by each layer of the CDPD Network architecture to the layer above.The Application Layer (Layer 7) allows for protocols and
25、services required by particular user-designed application processes. Functions satisfying particular user requirements and application service elements that can be used by more than one application are contained in this layer. Representation and transfer of information necessary to communicate betwe
26、en applications are the responsibility of the lower layers. See Part 310 for the references that apply to each CDPD application.The Presentation Layer (Layer 6) specifies or, optionally, negotiates the way information is represented for exchange by application entities. The Presentation Layer provid
27、es the representation of: a. Data transferred between application entitiesb. The data structure that the application entities usec. Operations on the datas structure. The Presentation Layer is concerned only with the syntax of the transferred data. The datas meaning is known only to the application
28、entities, and not to the Presentation Layer. The Session Layer (Layer 5) allows cooperating application entities to organize and synchronize conversation and to manage data exchange. To transfer the data, session connections use transport connections. During a session, session services are used by a
29、pplication entities to regulate dialogue by ensuring an orderly message exchange on the session connection. The Transport Layer (Layer 4) connection-oriented service provides reliable, transparent transfer of data between cooperating session entities. The Transport Layer entities optimize the availa
30、ble network services to provide the performance required by each session entity. Optimization is constrained by the overall demands of concurrent session entities and by the quality and capacity of the network services available to the Transport Layer entities. In the connection-oriented transport s
31、ervice, transport connections have end-to-end significance, where the ends are defined as corresponding session entities in communicating End Systems. Connection-oriented transport protocols regulate flow, detect and correct errors, and multiplex data on an end-to-end basis. The Network Layer (Layer
32、 3) provides packet routing and relaying between end systems on the same network or on interconnected networks, independent of the transport protocol used. The network layer may also provide hop-by-hop network service enhancements, flow control and load leveling. Services provided by the network lay
33、er are independent of the distance separating interconnected networks. 3013Communications Network Model TIA/EIA-732-301123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960The Data Link Layer (Layer 2) provides communication among two or more
34、 adjacent systems. The data link layer performs frame formatting, error checking, addressing, and other functions necessary to ensure accurate data transmission between adjacent systems. Note that the Data Link Layer can operate in conjunction with several different access methods in the Physical La
35、yer. The Physical Layer (Layer 1) provides a physical connection for transmission of data between data link entities. Physical Layer entities perform electrical encoding and decoding of the data for transmission over a medium and regulate access to the physical network.Each layer may be further part
36、itioned into similar sequence of sub-layers, as shown in Figure 301-2.Each layer or sublayer in the CDPD Network communications architecture is defined with:a. Layer service access points (SAPs)b. Layer service primitivesc. Layer protocold. Layer Management Entity.A layer service access point is the
37、 point at which layer N provides services to layer N+1. For example, a Data Link Layer Service Access Point (LSAP) is the point at which the Data Link Layer provides services to the Network Layer. Associated with each LSAP is one or more data link connection endpoints. A layer service access point i
38、s also the point at which layer N accesses services provided by layer N-1. For example, the Data Link Layer FIGURE 301-2 Protocol SublayersLayer N + 1Layer NSublayerSublayerSublayerLayer N - 1Layer N SAPLayer NconnectionendpointTIA/EIA-732-301 Subprofile Concepts3014123456789101112131415161718192021
39、222324252627282930313233343536373839404142434445464748495051525354555657585960communicates with the Physical Layer through the Physical Layer Service Access Point (PhSAP). The PhSAP is used to exchange message units between the Data Link Layer and the Physical Layer. Layer entities exist in each lay
40、er. Entities in the same layer but in different systems that must exchange information to achieve a common objective are called peer entities. Entities in adjacent layers interact through their common boundary. The services provided by a layer are the combinations of the functions provided by the as
41、sociated sublayers and the layers below. For example, the services provided by the Data Link Layer are combinations of the functions provided by the data link sublayers and by the Physical Layer.Cooperation between layer entities is governed by a peer-to-peer protocol specific to the layer. This lay
42、er protocol provides the mechanism for data to be exchanged between peer layer entities. In order for information to be exchanged between two or more network layer entities, an association must be established between the Network Layer entities in the Data Link Layer using the Data Link Layer protoco
43、l. This association is called a Data Link Connection. Data Link Connections are provided by the Data Link Layer between two or more LSAPs.Layer entities request services from a lower layer via service primitives. The primitives represent, in an abstract way, the logical exchange of information and c
44、ontrol between the layer entity and adjacent layer entities. They do not imply or constrain implementation.2 Specification ArchitectureThe CDPD Network specifications define a number of subprofiles as building blocks that may be selected and combined to define a particular CDPD Network element. Subp
45、rofiles define the specific multi-layer protocol requirements for a CDPD Network element or a CDPD Network service.The CDPD Network specifications define three major classes of subprofiles:a. Application subprofilesb. Lower layer subprofilesc. Subnetwork subprofiles.The CDPD Network provides a wide
46、variety of standard application services to support various CDPD Service Provider network application services (e.g., messaging, virtual terminal, directory and network management). Each application may require a different set of services from the Application, Presentation and Session Layers. Thus,
47、CDPD application subprofiles specify the Layer 5, 6 and 7 requirements for each application service. Figure 301-3 depicts the CDPD subprofiles necessary for CDPD support services. Figure 301-4 depicts the CDPD subprofiles for CDPD application services.3015Specification Architecture TIA/EIA-732-30112
48、3456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960The CDPD Network achieves inter-operability across all CDPD Service Providers by using a consistent method (subprofile) to perform the functions of end-to-end reliable data transfer. To assur
49、e inter-operable data transfer for a variety of CDPD Service Provider support applications across a variety of subnetwork technologies, the CDPD Network mandates support of lower-layer services provided by Transport Protocol Class 4 (TP4) and the Connectionless Mode Network Protocol (CLNP). The use of TP4 and CLNP provides a common basis for reliable end-to-end communication across all types of subnetworking technology. The support of appropriate subprofiles based upon TP4 and CLNP (i.e., ISO COTS-CLNS in End Systems, and CDPD CLNS-Relay in Intermediate Systems) is mandatory
