TIA TIA-2001.4-E-3

This standard provides the specification for the interface which coincides with the Refe rence Point “A” defined in the TR45 Network Re ference Model shown in [I-4] and with Reference point 48 as defined in the Network Reference Model shown in [27]. 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 capabilit ies 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 [27]. It should be noted that, for a given call, the transcoder may or may not be in the MGW or BS. This protocol definit ion 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 th1 e BS and the MSCe and MGW without prescribing specific implementations.

Purpose

The purpose of this document is to provide a standard for interfacing a MSC with one or more Base Stations (BSs). In addition, this standard provides for interfacing a Mobile Switching Center Emulat ion (MSCe) and a MGW to one or more BSs. This document defines the functional capabilit ies, including services and features, of the specified interface. These services and features are the defining characteristics that are the basis for the overall system standard.

¹ cdma2000^® is the trademark for the technical nomenclature for certain specifications and standards of the Organizational Partners (OPs) of 3GPP2. Geographically (and as of the date of pub lication), cdma2000^® is a registered trademark of the Telecommunications Industry Association (TIA-USA) in the United States.