1、 TIA/EIA STANDARD Cellular Digital Packet Data (CDPD) System Specification Overview of the Airlink TIA/EIA-732-400 (Upgrade of TIA/EIA/IS-732-400) JULY 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of ANSI/TIA/EIA-732-40
2、0-2001 Approved: June 7, 2001 TIA/EIA-732-400 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 pur
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4、 nor 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 Standard
5、s Institute (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 applic
6、able 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. 4033-400-UG, formulated under the cognizance of the TIA T
7、R-45.6 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 ENGINEER
8、ING 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 permi
9、ssion 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 400iTIA/EIA-732-4001234567891011121314
10、15161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960Contents1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400-12 Relationship to Existing Standards. . . . . . . . . . . . . . . . . . . . . . . .
11、. . . . 400-23 Airlink Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400-23.1 Airlink Protocol Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .400-23.2 Packet Transformations . . . . .
12、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .400-44 Summary of AirlinkDefining Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 400-64.1 Part 401: Physical Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13、. . . . . . . . . . . .400-64.2 Part 402: Medium Access Control Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .400-64.3 Part 403: Mobile Data Link Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .400-74.4 Part 404: Subnet
14、work-Dependent Convergence Protocols . . . . . . . . . . . . . . . . . . . . . . . . .400-74.5 Part 405: Radio Resource Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .400-84.6 Part 406: Airlink Security . . . . . . . . . . . . . . . . . . . . . . . . . . .
15、. . . . . . . . . . . . . . . . . . . . . . . .400-94.7 Part 408: MDBS Performance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .400-94.8 Part 409: M-ES Performance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .400-9TIA/EIA-
16、732-400400ii123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960400iii123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960TIA/EIA-732-400PART 400 Overview of the AirlinkForewordThis
17、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 significant portions of material originally submitted by the Cellular Digital Packet Data Forum Inc.This document set constitutes the Cellular Digital
18、 Packet Data (CDPD) System Specification. 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 Stand
19、ard 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 Packet Data System Specification is as follows:a71 Introduction and OverviewTIA/EIA-732-400 Overview of the Airlink400iv1234567891011121314151
20、61718192021222324252627282930313233343536373839404142434445464748495051525354555657585960This 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 f
21、ollowed by the design concepts used 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 refere
22、nce 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 799Protocols and InterfacesThese Parts form the heart of the CDPD System Specification. They define the communications architecture of CDPD, inc
23、luding communications layer entities, 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 o
24、f the primary CDPD protocols. State 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 conta
25、in 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 Part 1999Guidelines for Service ProvidersThese Parts describe guidelines for CDPD Service Providers.4001123456789101112131415161718192021
26、222324252627282930313233343536373839404142434445464748495051525354555657585960Introduction TIA/EIA-732-400PART 400 Overview of the Airlink1 IntroductionThis Part summarizes the protocols used across the CDPD Airlink. Details of these protocols may be found in Part 401 through Part 409, which follow.
27、Communications between the Mobile End System (M-ES) and the Mobile Data Base Station (MDBS) occur at the physical and Media Access Control (MAC) protocol layers. These layers are described in Part 401 and Part 402, respectively.Communications between the M-ES and the Mobile Data Intermediate System
28、(MD-IS) occur at the Logical Link Control (LLC) and subnetwork convergence protocol layers. These layers are described in Part 403 and Part 404, respectively.Radio Resource Management (RRM) procedures are performed at the physical, MAC and LLC protocol layers. These procedures are collectively respo
29、nsible for maintaining communications while the M-ES moves between cells and between the serving areas of different MD-ISs. Part 405 describes the RRM procedures.Security functions across the Airlink are described in Part 406.Physical performance requirements across the Airlink are described in Part
30、s 408 and 409.TIA/EIA-732-400 Overview of the Airlink40021234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859602 Relationship to Existing StandardsThe CDPD Network design maximizes the use of previously defined and widely available national an
31、d international standards. The intent is to minimize the amount of development necessary to implement and deploy the network. The Airlink is the main portion of the system where it has been necessary to design new protocols and procedures. However, so far as possible, the CDPD System Specification a
32、dheres to the principles of layering defined in ISO-7498 and CCITT-X.200. Wherever new protocols and procedures have been required for Airlink operation, these have, so far as possible, been designed by modifying appropriate existing standards.3 Airlink FunctionsThe Airlink provides wireless radio f
33、requency data communications between the M-ES and the serving portions of the CDPD Network, namely the MDBS and the MD-IS. 3.1 Airlink Protocol ProfileTo provide this support, data communications shall follow the shaded area of the protocol profile outlined in Figure 400-1. This area of the figure s
34、hows protocol elements that are the subject of Part 401 through Part 409.4003Airlink Functions TIA/EIA-732-400123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960FIGURE 400-1 Airlink Protocol ProfileThe Airlink Interface provides access to t
35、he CDPD Network using either the Internet Protocol (IP) defined in RFC-791 or the ISO Connectionless Network Protocol (CLNP) defined in ISO-8473.The Network Layer Protocol Data Units (NPDUs, commonly referred to as packets) are transmitted across a mobile data link between the M-ES and the MD-IS usi
36、ng the Mobile Data Link Protocol (MDLP) defined in Part 403. MDLP is a modified form of the LAPD protocol defined in CCITT-Q.921. The necessary Subnetwork-Dependent Convergence Protocol (SNDCP) required to transform packets into a format appropriate for MDLP is defined in Part 404.The link layer PDU
37、s (called frames) are transferred in two steps. Transmissions between the MD-IS and the MDBS are controlled using one of the subnetwork protocols specified in Part 312. Transmissions between IP/CLNPSNDCPMDLPMACPhysicalM-ES MDBS MD-ISMACPhysicalMDLP RelayTP4CLNPSNDCFX.25/LAPD/PPP.DS0/Ethernet.IP/CLNP
38、RelayIP/CLNPSNDCPMDLPTP4CLNPSNDCFX.25/LAPD/PPP.DS0/Ethernet.Shaded Area: Scope of the AirlinkTIA/EIA-732-400 Overview of the Airlink4004123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960the MDBS and the M-ES make use of the MAC protocol de
39、fined in Part 402 using the physical medium defined in Part 401.3.2 Packet TransformationsThe transformations undergone by an individual network layer packet for transmission from the M-ES are summarized in Figure 400-2. In the forward direction, similar transformations take place but they are divid
40、ed between the MD-IS and the MDBS.The following steps are undertaken in the SNDCP layer, defined in Part 404:a71 The packet header is compressed (optional)a71 The packet is compressed (optional)a71 The packet is segmented. Each segment is provided with a segment header. The segments are transmitted
41、in sequence.a71 Each segment is encrypted.The following step is undertaken in the link layer defined in Part 403:a71 Each segment is encapsulated within a frame header for transmission across the link.The following steps are undertaken in the MAC layer defined in Part 402:a71 The sequence of frames
42、are transformed into an information bit stream by the insertion of frame flags to delimit frames from each othera71 The bit stream is blocked into consecutive sets of bitsa71 Each block is subjected to Reed-Solomon forward error correctiona71 Each block is transmitted as a sequence of bits.The follo
43、wing step is undertaken in the Physical Layer, defined in Part 401:a71 Each bit is a single symbol of a Gaussian Minimum Shift Keying (GMSK) waveform.On reception, these steps are reversed in sequence in order to obtain the network layer packet.4005Airlink Functions TIA/EIA-732-400123456789101112131
44、415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960FIGURE 400-2 Packet Transformation Data FlowPARITY 3 PARITY 1PARITY 2DATA 4 DATA 3 DATA 2DATA 1FRAME 3 FRAME 2 FRAME 1FRAME 3 FRAME 2 FRAME 1SEGMENT 3 SEGMENT 2 SEGMENT 1DATANETWORK LAYER DATA HEADERCOM-PRES
45、SED HEADERHEADER COMPRESSIONENCRYPTIONSEGMENTATIONFRAMINGINFORMATION BIT STREAM CREATIONBLOCKINGSEGMENTHEADERFRAMEHEADERFRAMEFLAGLEGENDUnmodified InputModified Input or Added to InputPROCESSINGSEGMENT 3SEGMENT 2 SEGMENT 1ENCRYPTEDDATAENCRYPTION ENCRYPTIONNETWORK LAYER: IP/CLNPSUBNETWORK LAYER:SNDCPM
46、AC LAYER:DSMA/CDDATAMDLPLINK LAYER:COMPRESSIONPARITY 4BLOCK 3BLOCK 2 BLOCK 1PHYSICAL LAYER:GMSKBLOCK 4TIA/EIA-732-400 Overview of the Airlink40061234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859604 Summary of AirlinkDefining PartsParts 401
47、through Part 409 define different aspects of Airlink operation. Parts 401 through Part 404 define the protocols and procedures required at different layers to transfer data between the M-ES and the MDBS or MD-IS. Parts 405 and Part 406 define the management procedures for managing the radio resource
48、 and Airlink security. Part 408 and Part 409 define the performance requirements for communication across the Airlink.4.1 Part 401: Physical LayerPart 401 defines the Physical Layer of the network between the M-ES and the MDBS. It is concerned with defining:a71 The center frequency and the channel b
49、andwidths of the RF channels used for communications and the interface primitives defining means for tuning to thema71 The modulation of the transmitted and received waveform, the data rates and the interface primitives for transmitting and receiving individual bitsa71 The levels of transmission power, the measurement of received signal strengths and the interface primitives for setting power levels, receiving measurement indications.Part 401 is modelled on the requirements for the cellular communications standards EIA/TIA-54, EIA/TIA-55 and EIA/TIA-553.4.2 P
