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22、-102.BACC-B iForeword (This foreword is not part of this bulletin.) This document has been created in response to a request by the APCO/NASTD/FED Project 25 Steering Committee as provided for in a Memorandum of Understanding (MOU) dated April 1992 and amended December 1993. The MOU states APCO/NASTD
23、/FED shall devise a Common System Standard for digital public safety communications (the Standard) commonly referred to as Project 25 or P25, and that TIA, as agreed to by the membership of the appropriate TIA Engineering Committee, will provide technical assistance in the development of documentati
24、on for the Standard. If the abbreviation “P25” or the wording “Project 25” appears on the cover sheet of this document when published that indicates the APCO/NASTD/FED Project 25 Steering Committee has adopted this document as part of the Standard. The appearance of the abbreviation “P25” or the wor
25、ding “Project 25” on the cover sheet of this document or in the title of any document referenced herein should not be interpreted as limiting the applicability of the information contained in any document to “P25” or “Project 25” implementations exclusively. This document provides an informative ove
26、rview of the Inter-RF Subsystem Interface (ISSI) and a high level description of the services supported by the ISSI consistent with TSB-102-B (TIA-102 Documentation Suite Overview). This document also identifies (1) TIA publications that comprise the ISSI documentation suite and (2) future ISSI stan
27、dards development considerations. This revision reflects relevant progress that has occurred since publication of TSB-102.BACC-A in 2003. The main purpose of the 2003 document was to facilitate the development of the initial set of ISSI TIA-102 documentation for possible adoption by APCO/NASTD/FED P
28、roject 25 as part of the Standard. As such, TSB-102.BACC-A contains information that is now provided in currently available ISSI TIA-102 documentation and related documents or is now out-of-date. This revision serves as an umbrella document to the ISSI TIA-102 documentation suite by providing a high
29、-level overview of the ISSI features, the documents that are published, and the documents currently being drafted. This revision provides a current overview of features, trunked and conventional capabilities and architectures, and where to find more details. TIA makes no claims as to the applicabili
30、ty of the information contained in this document for any purpose although it is believed that the information will prove to be invaluable to manufacturers and operators of ISSI equipment. Some aspects of the specifications contained in this document may not have been operationally tested; however, a
31、 great deal of time and good faith effort has been invested in the preparation of this document to ensure the accuracy of the information it contains. This document is subject to change as the ISSI adds features and services. TSB-102.BACC-B ii Patent Identification The readers attention is called to
32、 the possibility that compliance with this document may require the use of one or more inventions covered by patent rights. By publication of this document no position is taken with respect to the validity of those claims or any patent rights in connection therewith. The patent holders so far identi
33、fied have, we believe, filed statements of willingness to grant licenses under those rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such licenses. The following patent holders and patents have been identified in accordance with the TIA intellectual p
34、roperty rights policy: None identified TIA shall not be responsible for identifying patents for which licenses may be required by this document or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. TSB-102.BACC-B iiiTABLE OF CONTENTS 1. INTR
35、ODUCTION . 1 1.1 OBJECTIVE OF THE ISSI STANDARDS . 1 1.2 PURPOSE AND SCOPE OF THIS ISSI OVERVIEW . 1 1.3 ORGANIZATION . 1 1.4 DOCUMENT REVISION HISTORY . 2 2. ISSI TERMINOLOGY . 3 2.1 DEFINITIONS 3 2.2 ACRONYMS AND ABBREVIATIONS . 4 3. INFORMATIVE REFERENCES 5 4. TECHNICAL OVERVIEW OF THE ISSI . 7 4
36、.1 BACKGROUND . 7 4.2 ARCHITECTURE OVERVIEW . 8 4.2.1 ISSI Connectivity between RFSSs 9 4.2.2 Connectivity of Trunked RFSSs with Trunked Console Subsystems 10 4.2.3 Connectivity between Conventional LMR System Elements 10 4.3 ROAMING OVERVIEW . 12 4.3.1 Manual Roaming . 13 4.3.2 Automatic Roaming .
37、13 4.3.3 “In-call” Roaming 13 4.3.4 Roaming of SUs Within and Among LMR systems 13 4.4 RFSS ROLES . 14 4.4.1 Subscriber Unit ID (SUID) and Working Unit ID (WUID) . 14 4.4.2 Subscriber Group ID (SGID) and Working Group ID (WGID) 14 5. FUNCTIONAL SERVICES SUPPORTED BY THE ISSI 16 5.1 BEARER SERVICES 1
38、6 5.2 TELESERVICES. 16 5.3 DATA SERVICES 17 5.4 SUPPLEMENTARY SERVICES 17 5.5 MOBILITY AND REGISTRATION SERVICES . 18 5.6 SECURITY SERVICES . 18 5.7 CONSIDERATIONS BEFORE ESTABLISHING ISSI CONNECTIONS AMONG RFSSS 19 5.8 MOBILITY MANAGEMENT 19 5.9 RFSS SERVICE CAPABILITY POLLING 20 5.10 USE CASES OF
39、THE ISSI . 20 5.10.1 Coverage Extension 20 5.10.2 Multi-Agency/Multi-Jurisdiction Interoperability 20 6. ISSI DOCUMENTATION SUITE . 22 7. FUTURE ISSI STANDARDS CONSIDERATIONS 24 TSB-102.BACC-B iv Table of Figures FIGURE 4-1 REPRESENTATIVE GENERAL SYSTEM MODEL DEPICTING ISSI (G INTERFACE) 8 FIGURE 4-
40、2 TYPICAL COMPLEXITY LEVEL 1 MODEL 11 FIGURE 4-3 TYPICAL COMPLEXITY LEVEL 2 MODEL . 12 List of Tables TABLE 1-1 REVISION HISTORY . 2 TABLE 5-1 BEARER SERVICES SUPPORTED BY THE ISSI. 16 TABLE 5-2 TELESERVICES SUPPORTED BY THE ISSI . 17 TABLE 5-3 DATA SERVICES SUPPORTED BY THE ISSI . 17 TABLE 5-4 SUPP
41、LEMENTARY SERVICES SUPPORTED BY THE ISSI 17 TABLE 5-5 MOBILITY AND REGISTRATION SERVICES SUPPORTED BY THE ISSI . 18 TABLE 5-6 SECURITY SERVICES 19 TABLE 6-1 TIA-102 ISSI STANDARDS AND TSBS 22 TABLE 6-2 ISSI MESSAGES AND PROCEDURES DOCUMENTS . 23 TABLE 6-3 ISSI TEST DOCUMENTS 23 TSB-102.BACC-B 11. In
42、troduction 1.1 Objective of the ISSI Standards The objective of the Inter-RF Subsystem Interface (ISSI) documents is to specify an open interface in the General System Model that supports extended communication capabilities for dispatch and subscribers of services. This is accomplished via the inter
43、connection of Radio Frequency Subsystems (RFSSs). 1.2 Purpose and Scope of this ISSI Overview The purpose of the ISSI Overview is to provide an informative overview of key technical aspects and considerations supporting specification of the ISSI. This document serves as the umbrella document for the
44、 ISSI document suite. It includes a high-level overview of the ISSI features and services consistent with the TIA-102 Documentation Suite Overview 102. This document also identifies ISSI-related documents that have been published and documents currently in progress as well as future ISSI considerati
45、ons. In addition, this document provides an overview of trunked and conventional capabilities and architectures supported by the ISSI, and cites selected references relevant to obtaining further information on the topics presented in this Telecommunication Standards Bulletin (TSB). The architecture
46、discussion also presents the Fixed Station Subsystem Interface (FSSI) and the Console Subsystem Interface (CSSI) and how these interfaces relate to the ISSI in order to provide a more complete picture of the extended communication capabilities discussed in this document. The scope of this document i
47、s restricted to the description of an ISSI that supports wide area voice services, packet data services, and supplementary services via interconnection of RFSSs (from the same or different manufacturers) using Internet Protocol (IP)-based networks as described in the TIA-102 Documentation Suite Over
48、view 102. 1.3 Organization This document is organized as follows: Clause 1 Provides an introduction that identifies the objectives of the ISSI documents and the purpose and scope of the ISSI Overview TSB. Clause 2 Provides a list of key ISSI terminology, including acronyms and abbreviations. TSB-102
49、.BACC-B 2 Clause 3 Provides a list of informative references. Clause 4 Presents a high level technical overview of the ISSI. Clause 5 Identifies key functional services supported by the ISSI. Clause 6 Describes the ISSI documentation suite. Clause 7 Identifies future ISSI standards considerations. 1.4 Document Revision History Table 1-1 identifies the versions of this document that have been published previously. Table 1-1 Revision History Version Date Description 1 December, 1996 Initial version published by TIA as TSB-102.BACC. 2 October, 2003 Second version published by TIA
