TIA TIA-2001.4-D

This standard provides the specification for the interface which coincides with the Reference Point "A" defined in the TR45 Network Reference Model shown in [25] and with Reference point 48 as defined in the Network Reference Model shown in [28]. The scope of this standard includes the following topics:

• Descriptions of the specified functional capabilities that provide wireless telecommunications services across the A1 interface as defined in the TR45 Network Reference Model;

• Descriptions of the division of responsibility of the functions provided between the BS and the MSC, without prescribing specific implementations;

• Descriptions of the A1 interface standard that support DS-41 [7] and cdma2000^®1 systems.

• Descriptions of the specified functional capabilities that provide circuit services across the packet transport based MSCe-BS (A1p) and MGW-BS (A2p) interfaces as defined in the Network Reference Model shown in [28]. It should be noted that, for a given call, the transcoder may or may not be in the MGW or BS. This protocol definition is not limited by the location or existence of the transcoder in the bearer path.

• Descriptions of the division of responsibility of the functions provided between the BS and the MSCe and MGW without prescribing specific implementations.

Purpose

This document contains the message procedures, bitmaps, information elements, and timers used to define the A1 and A1p interfaces. In this document, "MSC" refers to either a circuit-switched MSC or a packet-based MSC emulator (MSCe). In situations where a statement applies to either the circuit-switched or packet-based MSC exclusively, the type of MSC will be specifically identified (i.e. "circuit-switched MSC" or "MSCe"). For signaling, the term MSC refers to either a circuit-switched MSC or an MSCe. For bearer path, the term MSC refers to either a circuit-switched MSC or a MGW. A1 messages are used by both the A1 and A1p interfaces except where indicated.

¹ cdma2000^® is the trademark for the technical nomenclature for certain specifications and standards of the Organizational Partners (OPs) of 3GPP2. When applied to goods and services, the cdma2000® mark certifies their compliance with cdma2000^® standards. Geographically (and as of the date of publication), cdma2000^® is a registered trademark of the Telecommunications Industry Association (TIA-USA) in the United States.