1、 TIA/EIA STANDARD Cellular Digital Packet Data (CDPD) System Specification Airlink Physical Layer TIA/EIA-732-401 (Upgrade of TIA/EIA/IS-732-401) JULY 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of ANSI/TIA/EIA-732-401
2、-2001 Approved: June 7, 2001 TIA/EIA-732-401 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 purc
3、haser 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,
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 Standards
5、 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 applica
6、ble 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. 4033-401-UG, formulated under the cognizance of the TIA TR
7、-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 ENGINEERI
8、NG 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 permis
9、sion 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 401iTIA/EIA-732-40112345678910111213141
10、5161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960Contents1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401-12 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11、. . . . . . . . . . . . . . 401-12.1 Model of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-22.2 Physical Layer Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12、 .401-33 Services Provided by Physical Layer . . . . . . . . . . . . . . . . . . . . . . . . . . 401-43.1 RF Channel Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-43.2 Data Transfer . . . . . . . . . . . . . . . . . . . . . . . .
13、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-53.3 Power Primitives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-54 Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14、. . . . . . . . . . . . . . . . 401-64.1 RF Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-64.2 Power Output Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15、 . . . .401-64.2.1 Forward RF Channel (MDBS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-74.2.1.1 Steady State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-74.2.1.2 Rampup and Rampdown
16、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-74.2.2 Reverse RF Channel (M-ES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-74.2.2.1 Steady State . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17、 . . . . . . . . . . . . . . . . . . . . . . . . . . .401-74.2.2.2 Rampup and Rampdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-84.3 Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、. . . . . . . . . . . .401-94.3.1 Forward RF Channel (MDBS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-94.3.2 Reverse RF Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-94.4 Modulation
19、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-94.5 Bit Transmission Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401-10TIA/EIA-732-401401ii12345678910111
20、2131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960401iii123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960TIA/EIA-732-401PART 401 Airlink Physical LayerForewordThis foreword is not part of the
21、 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 Packet Data (CDPD) System
22、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 Standard is published as a serie
23、s 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-732-401 Airlink Physical Layer401iv12345678910111213141516171819202122232425262728293
24、0313233343536373839404142434445464748495051525354555657585960This 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 concep
25、ts 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 reference list of non-CDPD documen
26、ts.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, including communications layer
27、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 of the primary CDPD protocols
28、. 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 contain Abstract Test Suites (ATS
29、s) 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.40111234567891011121314151617181920212223242526272829303132333435
30、36373839404142434445464748495051525354555657585960Introduction TIA/EIA-732-401PART 401 Airlink Physical Layer1 IntroductionThis Part defines the Physical Layer of the Airlink Interface between the Mobile Data Base Station (MDBS) and the Mobile End Systems (M-ESs).Minimum performance requirements for
31、 MDBSs and M-ESs wishing to use this interface are defined in Part 408 and Part 409.The Physical Layer is modelled on the requirements for cellular operation specified in EIA standards EIA/IS-19, EIA/IS-20, EIA/TIA-54, EIA/TIA-55, EIA/TIA-56 and EIA/TIA-553.2 OverviewThe Physical Layer accepts a seq
32、uence of bits from the Medium Access Control (MAC) Layer and transforms them into a modulated waveform for transmission to the remote end. The Physical Layer also receives a modulated waveform from the remote end which it transforms into a sequence of received bits for delivery to the MAC layer. The
33、 Physical Layer also provides the ability to tune to a specific RF channel, to measure the Received Signal Strength Indication (RSSI) of the received signal, and set the transmission power of the transmitted signal to a specified level.TIA/EIA-732-401 Airlink Physical Layer40121234567891011121314151
34、617181920212223242526272829303132333435363738394041424344454647484950515253545556575859602.1 Model of OperationThe operation of the Physical Layer is modelled on the abstractions defined in CCITT-X.200. The application of this model to the Physical Layer is shown in Figure 401-1.FIGURE 401-1 Physica
35、l Layer: X.200 Reference Model Communication takes place between two active elements, such as modems, which are modelled as Physical Layer Entities (Ph-Entities). The Ph-Entities are driven by users, for example, DSP processors implementing the MAC layer protocol defined in Part 402, which are model
36、led as MAC Entities. In addition, the active element responsible for configuration and management of a Ph-Entity is modelled as a Management Entity.Peer-to-peer communications between Ph-Entities takes place over a pair of RF channels. Transmissions from the MDBS Ph-Entity to the M-ES Ph-Entity are
37、sent over the forward RF channel. Transmissions from the M-ES Ph-Entity to the MDBS Ph-Entity are sent over the reverse RF channel.PhSAPManagementEntiMAC-EntityPhysical Layer PhSAPManagementEntiMAC-EntityPhysical Layer Ph Primitives Ph PrimitivesForward RF ChannelM-ESMDBSReverse RF Channel4013Overvi
38、ew TIA/EIA-732-401123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960There is precisely one MAC-Entity and one Ph-Entity in each M-ES or MDBS for each pair of RF channels. However, the transmissions of a single MDBS Ph-Entity are received b
39、y all M-ES Ph-Entities on the same RF channel pair. Interactions between each Ph-Entity and its associated MAC-Entity occur across an interface, the Ph-Interface. These interactions take place through a Physical Service Access Point (PhSAP). There is precisely one PhSAP for each Ph-Entity. There is
40、no identification required for the Ph-Entity. There is no identification required for the PhSAP. An MDBS shall provide one Ph-Entity for each pair of RF channels supported simultaneously. For each Ph-Entity there shall be one corresponding MAC-Entity and one corresponding Link-Entity. The means by w
41、hich an MDBS Management-Entity distinguishes between different Ph-Entities shall be implementation dependent.Interactions between the MAC-Entity and the Ph-Entity are modelled by the definition of abstract primitives and associated parameters. The set of primitives supported across the Ph-Interface
42、defines the set of services provided by the Physical Layer. The set of interactions required between Ph-Entities defines the Physical Layer Protocol.Data is transferred across the Ph-Interface in Physical Service Data Units (PhSDUs), which correspond to individual bits. 2.2 Physical Layer Characteri
43、sticsThe basic function provided by the Physical Layer is to transmit a sequence of bits as a modulated waveform. The RF channel over which this is done is one of the 30 kHz RF channels provided for use by cellular telephone transmissions in specification EIA/TIA-553. Communications between the MDBS
44、 and the M-ES take place over a pair of such RF channels, the pairing conforming to the rules laid down in EIA/TIA-553. RF channels used as AMPS control channels shall not be used for CDPD.The data transmissions make use of Gaussian Filtered Minimum Shift Keying (GMSK) modulation1at a data rate of 1
45、9.2 kbps.The transmissions take place at a power level consistent with the power classes defined by specifications EIA/TIA-54, EIA/TIA-55 and EIA/TIA-56. The received signal strength shall be measured by both the MDBS and the M-ES to determine whether the M-ES is transmitting at the most appropriate
46、 power level. 1. See K. Murota & K. Hirade: “GMSK Modulation for Digital Mobile Radio Telephony,” IEEE Trans. Comm., vol. COM-29, pp 1044-1050, July 1981.TIA/EIA-732-401 Airlink Physical Layer401412345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565
47、75859603 Services Provided by Physical LayerThe Physical Layer provides the following services to the MAC layer:a71 The ability to tune to a specified pair of RF channels for transmission and reception of bits between the M-ES and the MDBSa71 The ability to transmit and receive bits between the M-ES
48、 and the MDBS across the pair of RF channelsa71 The ability to set the power level to be used for transmission of bits between the M-ES and the MDBSa71 The ability to measure the signal level of received bits at the M-ES and the MDBSa71 The ability to suspend and resume monitoring of RF channels in
49、the M-ES in support of measures taken to conserve battery power.The primitives used to provide service across the physical user and management interfaces are defined in the remainder of this section. They are summarized in Table 401-1.TABLE 401-1 Summary of Physical Interface Primitives3.1 RF Channel ManagementThe following primitives are used by the Management Entity to control access to RF channels:a71 Ph-OPEN.request, invoked to tune away from the current RF channel to a new RF channel. This primitive has one associated mandatory parameter, the RF CHAN
