1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21624-5 SANS 2327:1991Edition 1 and nat. amdt 1MPT 1327:1991Edition 3Any reference to SABS MPT 1327 is deemed to be a reference to this st
4、andard(Government Notice No. 1373 of 8 November 2002 SOUTH AFRICAN NATIONAL STANDARD A signalling standard for trunked private land mobile radio systems This national standard is the identical implementation of MPT 1327:1991 and is adopted with the permission of the Controller of Her Britannic Majes
5、tys Stationery Office. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 2327:1991 Edition 1 and nat. amdt 1 MPT 1327:1991 Edition 3 Table of chan
6、ges Change No. Date Scope Nat. amdt 1 2008 Amended to change the designation from SABS to SANS, with no technical changes. National foreword This South African standard was approved by National Committee StanSA TC 74, Communication technology, in accordance with procedures of Standards South Africa,
7、 in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in July 2008. This document supersedes SABS MPT 1327:1991 (edition 1). The adoption of MPT 1327 was approved with the following deviation: The designation “Band III, sub-bands 1 and 2” is not applicable and should
8、 be ignored throughout the document. For all references to Department of Trade and Industry (DTI), Radiocommunications Agency or RA, and the Patent Agent, read the Independent Communications Authority of South Africa (ICASA). In South Africa, band plans are regulated by the Independent Communication
9、s Authority of South Africa (ICASA). The South African Table of Frequency Allocations is obligatory for South Africa and will override any reference to frequency ranges as mentioned in this document. For the purpose of type-approval the reader should consult the relevant regulations prescribed by IC
10、ASA. MP 1327 JANUARY 1988 A SIGNALLING STANDARD FOR TRUNKED PRIVATE LAND MOBILE RADIO SYSTEMS SANS 2327:1991This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .(C) Crown Copyright 1988 First published January I988 Reprinted and revised October 19
11、90 Reprinted and revised November 1991 Amendments issued since publication Amendment Date of issue 1 Number 1 Text affected Incorporated in the version reprinted in October 1990. Amended text was highlighted by a bar in the margin. SANS 2327:1991This s tandard may only be used and printed by approve
12、d subscription and freemailing clients of the SABS .MPT 1327 A Signalling Standard for Trunked Private Land Mobile Radio Systems January 1988 Revised and reprinted November 1991 SANS 2327:1991This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SA
13、BS MPT 1327 SABS ed. IIMPT ed. 2 Blank SANS 2327:1991This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .FOREWORD This standard defines the rules for communication between radio units and trunking system controllers operating in trunked private l
14、and mobile radio systems. Applications and test conditions for this standard, applicable to Band 111, are contained in the following specifications prepared by the Department of Trade and Industry, Radiocommunications Agency. MPT 1343 System interface specification for radio equipment to be used wit
15、h commercial trunked networks operating in Band 111, sub-bands 1 and 2. MPT 1347 Radio interface specification for commercial trunked networks operating in Band 111, sub-bands 1 and 2. MPT 1352 Test schedule for the approval of radio units to be used with commercial trunked networks operating in Ban
16、d 111, sub-bands 1 and 2. Intellectual Propertv Rights Firms intending to manufacture equipment which complies with the standard should be aware that certain features of the standard are subject to IPR claims. All firms are therefore advised that they should make appropriate enquiries through their
17、Patent Agents before proceeding. SANS 2327:1991This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .CONTENTS INTRODUCTION DEFINITIONS SIGNALLING FORMATS ADDRESSING CODEWORD STRUCTURES CHANNEL DISCIPLINE RANDOM ACCESS PROTOCOL REGISTRATION PROCEDUR
18、ES BASIC CALL PROCEDURES EMERGENCY CALL PROCEDURES INCLUDE CALL PROCEDURES CALL DIVERSION PROCEDURES STATUS MESSAGE PROCEDURES SHORT DATA MESSAGE PROCEDURES DATA INTERROGATION PROCEDURES Section reserved for additional short data procedures e.g. Sus. STANDARD DATA PROCEDURES APPENDIX 1. APPENDIX 2.
19、APPENDIX 3. APPENDIX 4. APPENDIX 5. APPENDIX 6. APPENDIX 7. Suggested values for parameters. The error control properties of the codewords. An algorithm for determining the codeword completion sequence of a control channel system codeword. An algorithm for generating fields A and B of the MARK codew
20、ord. BCD coding. Reserved for Timing of responses for standard data at a customised rate. Other ideas considered during the drafting of section 17 (standard data). SANS 2327:1991This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .1. INTRODUCTION
21、MPT1327 is a signalling standard for trunked private land mobile radio systems. It defines the protocol rules for communication between a trunking system controller (TSC) and users radio units. The standard can be used to implement a wide variety of systems, from Small systems with only a few radio
22、channels (even single-channel systems), through to large networks which may be formed by the interconnection of TSCs. The protocol offers a broad range of user facilities and system options. However, it is not necessary to implement all of the facilities available; an appropriate subset of the proto
23、col could be implemented, according to the user requirements. Also, there is scope for customisation for special requirements, and provision has been made for further standardised facilities to be added to the protocol in the future. The standard defines only the over-air signalling and imposes only
24、 minimum constraints on system design. Additional specifications will be required for specific implementations, for example, to define: - the facilities that must be implemented - parameter values - a channel plan - for a network, criteria for when a radio unit should register. Section 1.1 of this i
25、ntroduction describes the user facilities which are explicitly provided by the protocol. (It does not describe additional facilities which may be offered in a radio unit but which do not require any specific protocol.) Section 1.2 describes some protocol features, indicating the options available to
26、 system designers. Section 1.3 provides an introduction to the operation of the protocol. Subsequent sections of this document contain the protocol definition. In most of these sections, the protocol rules for the TSC and for radio units are specified separately, but with cross-referencing where con
27、venient. Page 1-1 SANS 2327:1991This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .1.1 Ueer Facilities The facilities available to users are outlined below. For a full definition of the facilities, see the sections indicated. 1.1.1 Tvves of call
28、 The standard protocol enables radio units to make the following types call. Speech call. (See section 9.) Speech calls may be requested with normal or high priority. For group calls, the calling party may opt for a conversational mode, where all parties are able to speak, or for an announcement mod
29、e where only the caller may speak. Data call, for the transmission of non-prescribed signalling. (See section 9.) Parameters are available to specify either normal or high priority and, for a group call, whether the called group members can reply. (Provision has been made for specifying a standard m
30、ethod of data communication in the future). Emergency call. (See section 10.) Parameters are available to specify either a speech or a data call and, for a group call, whether the called group members can reply. Also, a radio unit may request a special mode of emergency service previously arranged w
31、ith the system; the TSC determines the required action by reference to the calling units address. Include call. (See section 11.) During a call, a unit may request that another party joins the call. This facility may be used to implement a Conference Call or Call Transfer. Status message. (See secti
32、on 13.) Thirty-two different status messages may be conveyed between units. The meanings of two of these messages are prescribed as a “call-me- back request“ and “cancel previous call-me-back request“. The remaining thirty messages have user-defined meanings. (Status messages can also be sent betwee
33、n radio units and the TSC.) Short Data Message. (See section 14.) Messages of up to 184 bits of free format data can be sent between units, or between units and the TSC. Page 1-2 SANS 2327:1991This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .1
34、.1.2 Makina calls A radio unit may request a call to any of the following called parties (except for status messages, which cannot be addressed to PABX or PSTN destinations or to groups): - an individual radio unit or line-connected unit - a group, or all units in the system - a PABX number, up to n
35、ine digits - a PSTN number, up to 31 digits. In addition, status messages and short data messages may be sent to the TSC. During call set-up, the TSC may pass a wide variety of information to the caller, to indicate the progress of the call. For example, it may indicate the reason for any delays in
36、call set-up or the reason for a call failure. A call request may be cancelled at any time. 1.1.3 Receivinu calls A radio unit may receive calls from a radio unit or line unit, or (except for status messages) from a PABX extension or the PSTN. In addition, status messages and short data messages may
37、be received from the TSC. For a call from a radio unit, a line unit or the TSC, the calling address may be supplied to the called unit. For a call from a PABX extension or from the PSTN, the calling gateway is indicated as the source of the call but the callers number is not conveyed to the called u
38、nit. Incoming calls may be addressed to the unit individually or to a group to which it belongs. A radio unit may be a member of an arbitrary number of groups; its group addresses can be chosen independently of its individual address. A radio unit may refuse to accept all incoming calls, for example
39、 by means of a “busy“ or “out-of-vehicle“ control, or incoming calls could be refused selectively, depending on the source of the call. If a user does not wish to proceed with an incoming call immediately, he can indicate that he will call back later. Systems may be configured to alert a called indi
40、vidual and require him to indicate that he is ready, before a traffic channel is allocated for a call. 1.1.4 Divertins Calls If a radio unit does not wish to receive calls, it may request that future calls addressed to it be redirected to a specified alternative destination. A radio unit may also re
41、quest redirection on behalf of a third party, for example, for a unit which is not equipped for call diversion. A radio unit calling a diverted party will be informed of the alternative destination to try; it may then re-make the call automatically, or it may give the user the option of deciding whe
42、ther to call the alternative destination. See section 12 for the full diversion facilities. Page 1-3 SANS 2327:1991This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .1.2 System Features and Facilities 1.2.1 System dimensions The numbering range
43、of the protocol accommodates: - 1,036,800 addresses per system - 1024 channel numbers - 32768 system identity codes. 1.2.2 Svstem control The protocol uses signalling at 1200 bit/s with Fast Frequency Shift Keying (FFSK) subcarrier modulation. It is designed for use by two- frequency half-duplex rad
44、io units and a duplex TSC. The signalling for setting up calls is transmitted on a “control“ channel. A TSC can be operated using either of two control channel strategies: dedicated or non-dedicated. A dedicated system has a control channel permanently available for signalling, whereas a non-dedicat
45、ed system may assign the control channel for traffic (speech or data communication) if all the other channels are in use. The use of a dedicated control channel is appropriate for a TSC with many channels, whereas a non-dedicated control channel may be more appropriate for a TSC with only a few chan
46、nels. The protocol allows the use of either strategy. Broadcast messages are available to inform radio units of system information, such as the channels which the system may use for control signalling. One of the problems of mobile radio signalling systems is the clashing of messages from different
47、radio units transmitting at the same time. The problems of clashing are controlled by an access protocol which offers high efficiency, stability and flexibility. (See section 1.3.3 and section 7.) Protection against interference is provided by labelling the signalling with a system identity code and
48、, in some messages, the channel number. If heavy interference is encountered, control can be changed tc a different channel. TO cope with system malfunction, a customised fall-back mode of operation may be defined by the system designer. 1.2.3 Call handlinq The protocol is designed for use by systen
49、s which peue calls that cannot be set up immediately, for example, if no channel is currently available for traffic. Before a traffic channel is assigned for a call to an individual radio unit, the TSC checks that the called unit is in radio contact, in order to avoid wasted channel assignments. It may also check that the radic units operator is ready for the call, to avoid a traffic channel being assigned to an unmanned unit. Page 1-4 SANS 2327:1991This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Call maintenance signalling i
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