1、 TIA-102.CACA-2007 APPROVED: APRIL 18, 2007 REAFFIRMED: JANUARY 29, 2013 TIA-102.CACA April 2007Project 25 Inter RF Subsystem Interface (ISSI) Measurement Methods for Voice Services NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misund
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22、 OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-102.CACA iFOREWORD (This foreword is not part of this TIA standard.) This document has been published by the Telecommunications Industry Association (TIA) in accordance with the terms and conditio
23、ns provided for in a Memorandum of Understanding executed by and between the TIA, the Association of Public Safety Communications Officials (APCO), the National Association of State Telecommunications Directors, and the various agencies of the Federal government. The TIA makes no claims as to the ap
24、plicability of the information contained in this document for any purpose although it is believed that the information will prove to be invaluable to designers of Inter-Radio Frequency Subsystem Interface (ISSI) compliant equipment. Some aspects of the specifications contained in this document may n
25、ot have been fully operationally tested; however, a 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 defines measurement methods recommended for assessing the performance of wide area v
26、oice services provided by Project 25 (P25) Radio Frequency Subsystems (RFSSs) interconnected with P25-standardized ISSI functional services and protocols defined by TIA-102.BACA (Inter-RF Subsystem Interface Messages Definition for Voice Services). The ISSI voice service (IVS) measurement methods ar
27、e composed of performance parameter definitions and associated measurement procedures. In addition, nine informative (i.e., non-normative) annexes discuss supplemental topics. Development of a related new TIA standard is planned that will specify recommended IVS performance specifications for select
28、ed IVS performance parameters defined in this document. Future work is planned to define measurement methods (i.e., parameters and associated measurement procedures) recommended for assessing the performance of P25-standardized wide area functional services and protocols involving the ISSI in the fo
29、llowing areas: enhancement to the initial set of ISSI measurement methods defined in this document, console interactions across the ISSI, ISSI support for supplementary data services (e.g., call alert); ISSI support for data services; ISSI support for network management of subscriber units and netwo
30、rk elements, which is not considered part of the ISSI; ISSI support of telephone interconnect (including emergency services) by roamers back over their ISSI interconnected Home P25 system; ISSI support for emergency multimedia services; ISSI-related traffic engineering, traffic control, resource res
31、ervation, and service level agreements; and, interconnection of ISSI lower layers in an interoperable manner. TIA-102.CACA iiPatent Identification The readers attention is called to the possibility that compliance with this document may require the use of one or more inventions covered by patent rig
32、hts. 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 identified have, we believe, filed statements of willingness to grant licenses under those rights on reasonable and nondiscri
33、minatory 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 property rights policy: No patents have been identified. TIA shall not be responsible for identifying patents for which
34、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. Trademark Identification The following trademarks are referenced in this specification: IMBE is a trademark of Digital Voice Systems, Inc.*Use of
35、 the trademark identified in this standard is not an endorsement by TIA. TIA-102.CACA iiiTABLE OF CONTENTS 1 INTRODUCTION 1 1.1 Scope 1 1.2 Background 2 1.3 ISSI Voice Service (IVS) measurement methods 6 1.4 Document organization 10 2 REFERENCES 10 2.1 Normative references 10 2.2 Informative referen
36、ces 11 3 DOCUMENT REVISION HISTORY 11 4 ABBREVIATIONS 12 5 TERMS AND DEFINITIONS 13 5.1 IVS Measurement point 13 5.2 IVS Measurement point R 14 5.3 IVS Measurement point I 14 5.4 IVS Reference event 15 5.5 IVS Exit event 15 5.6 IVS Entry event 16 6 IVS PERFORMANCE MODELS 18 6.1 IVS reference configu
37、rations 19 6.2 IVS reference events 21 6.3 Future IVS reference events 27 6.4 IVS message transfer outcomes 27 7 IVS PERFORMANCE PARAMETERS 31 7.1 IVS call set-up delay 31 7.2 IVS call set-up failure ratio 42 7.3 IVS message transfer delay 48 7.4 IVS message loss ratio 52 8 IVS MEASUREMENT PROCEDURE
38、S 54 8.1 Overview 54 8.2 IVS call set-up delay 62 8.3 IVS call set-up failure ratio 86 8.4 IVS message transfer delay 90 8.5 IVS message loss ratio 115 Annex A Characteristics of IVS test equipment (informative) 118 Annex B IVS measurement methods under study (informative) 120 Annex C Guidance for c
39、onducting supplemental IVS measurements (informative) 128 Annex D Extended Generic IVS Performance Model 130 Annex E P25 CAI Voice Message Data Units at Data Link Layer of CAI 131 Annex F P25 CAI Voice Message Data Units observed at MPR(1) and MPR(2) 137 Annex G P25 RTP PTT Transmit Progress Packets
40、 at RTP-Application Layer of ISSI 140 Annex H P25 RTP PTT Transmit Progress and End Packet Payload observed at MPIs 142 Annex I IVS-CSD and IVS-MTD Composite Parameter Descriptions 143 TIA-102.CACA ivTIA-102.CACA 1PROJECT 25 INTER-RF SUBSYSTEM INTERFACE (ISSI) MEASUREMENT METHODS FOR VOICE SERVICES
41、1 INTRODUCTION 1.1 Scope This document defines measurement methods recommended for assessing the performance of Inter-RF Subsystem Interface (ISSI) voice services (IVS) provided by Project 25 (P25) Radio Frequency Subsystems (RFSSs) interconnected in accordance with P25 standardized ISSI functional
42、services and protocols 1. The ISSI enables mandatory standard subscriber unit-to-subscriber unit (SU-to-SU) and group voice services among subscribers registered at different RFSSs. The normative references define the ISSI functional services and protocols. The informative references provide an over
43、view of the ISSI, including identification of relevant user requirements, and related background information. The scope of this document is limited to the definition of measurement methods applicable to the functional services and protocols standardized by the normative references. The objective of
44、this document is to standardize measurement methods that define measurement parameters and measurement procedures recommended for assessing performance attributable to the ISSI in the provision of P25 wide area voice services.1The purpose of this document is to make possible meaningful comparisons o
45、f the results of measurements made by different observers of P25 wide area voice services involving the ISSI. The intended users of this document include P25 voice service providers, equipment manufacturers, and end users. This document may be used (1) by service providers in the planning, developme
46、nt, and assessment of P25 voice services 1In the context of this document, P25 wide area voice services are any SU-to-SU or group PTT call types that invoke ISSI functional services and protocols (i.e., when use of more than one RFSS is required for a particular IVS call scenario of interest). The t
47、erm P25 wide area voice services (or, in the context of this document, similar terms such as wide area call) is used to emphasize that a principal role of the ISSI is to increase the geographical coverage area for roaming SUs; however, the ISSI more generally enables the interconnection of multi-ven
48、dor RFSSs among and within P25 systems. TIA-102.CACA 2that meet end user performance needs, (2) by equipment manufacturers as performance metrics that will affect equipment design, and (3) by end users in evaluating performance. 1.2 Background Figures 1-1 and 1-2 illustrate conceptually salient aspe
49、cts of a push-to-talk (PTT) call representative of the type of P25 wide area voice services (i.e., P25 voice services involving the ISSI) that are within the scope of this document. Figure 1-1 identifies, for the objective and purpose of this document, the principal functional entities involved in providing and using P25 voice services involving the ISSI: the SUs (i.e., calling and called SUs) that participate in a given P25 wide area PTT call (group or SU-to-SU); the RFSSs (e.g., Home RFSS) that enable P25 wide area PTT calls using ISSI functional voice
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