This standard provides the specification for the interfaces which coincide with the Reference Points "A", "A_ter", "A_quater", and "A_quinter" defined in the 3GPP2 Wireless Network Reference Model shown in [I-1] and Reference Points 27 and 48 for Legacy MS Domain Step 1 [18] and Reference Points A1, A1p, A2 and A2p for Legacy MS Domain Step 2 [19].

The scope of this standard includes the following topics:

• MSC-BS and BS-BS interfaces:

- descriptions of the specified functional capabilities that provide wireless telecommunications services across the MSC-BS and BS-BS interfaces as defined in the 3GPP2 Wireless Network Reference Model;

- descriptions of the specified functional capabilities that provide wireless tele34 communications services across the MSCe-BS and the MGW-BS interfaces;

- descriptions of the division of responsibility of the functions provided between the BS and the MSC, and between the source BS and the target BS, without prescribing specific implementations;

- descriptions of the MSC-BS interface and the BS-BS interface standards that support DS-41 and cdma2000 systems.

• BS-PCF interfaces:

- descriptions of the specified functional capabilities that provide packet data services across the BS-PCF interface;

- descriptions of the division of responsibility of the functions provided betwee1 n the BS and the PCF without prescribing specific implementations.

• PCF-PDSN interfaces:

- descriptions of the specified functional capabilities that provide packet data services across the PCF-PDSN interface;

- descriptions of the division of responsibility of the functions provided between the PCF and the PDSN without prescribing specific implementations.

The interfaces defined in this standard are specified by a set of characteristics , including:

• physical and electromagnetic parameters;

• channel structures;

• message types and contents;

• network operating procedures;

• user data framing and transport.

Purpose

The purpose is to provide the standard for:

• interfacing a circuit-switched MSC with one or more BSs,

• interfacing an MSCe with one or more BSs,

• interfacing an MGW with one or more BSs,

• interfacing a BS with one or more BSs,

• interfacing a PCF with one or more BSs,

• interfacing one or more PDSNs with one or more PCFs.

This document defines the functional capabilities, including services and features, of the specified interfaces. These services and features are the defining characteristics that are the basis for the overall system standard.

The MSC-BS interface provides telecommunications services access between a Mobile Switching Center and a base station. It specifically represents the demarcation point between the MSC and the BS which coincides with the Reference Point "A". This point establishes the technical interface and designates the test points and operational division of responsibility between the MSC and the BS. The MSC and BS interface is defined as the A1/A2/A5 interface shown in Figure 2.2-1.

The MSCe-BS interface provides telecommunications services access between an MSCe and a BS. It specifically represents the demarcation point between the MSCe and the BS, which coincides with the Reference Point 48 [18]. This point establishes the technical interface and designates the test points and operational division of responsibility between the MSCe and the BS. The MSCe and BS interface is defined as the A1p interface shown in Figure 2.2-2.

This standard fulfills the following criteria:

• supports current [1]~[6], [7] and [10] air interfaces;

• makes maximum use of existing standards from the TIA and other sources;

• promotes reliability enhancement, technical innovation, network product availability, and economic competition;

• allows connection of various manufacturers' BSs to the same MSC;

• supports future MSC and BS implementations;

• allows the separate evolution of MSC and BS technology.

The BS-MGW interface provides a bearer for traffic between a BS and an MGW. The BS and MGW interface, defined as the A2p interface (Reference Point 27), is shown in Figure 2.2-2.

The source BS - target BS interface provides for inter-BS soft/softer handoffs. It specifically represents the demarcation point between two BSs which coincides with the Reference Point "A_ter". This point establishes the technical interface and designates the test points and operational division of responsibility between the source BS and target BS. The source BS and target BS interface is defined as the A3/A7 interface shown in Figure 2.2-1 and Figure 2.2-2.

The BS-PCF interface provides access between the BS and the Packet Control Function for high speed packet data services. It specifically represents the demarcation point between the BS and the PCF which coincides with the Reference Point "A_quinter". This point establishes the technical interface and designates the test points and operational division of responsibility between the BS and the PCF. The BS-PCF interface is defined as the A8/A9 interface shown in Figure 2.2-1 and Figure 2.2-2.

The PCF-PDSN interface provides access between a Packet Control Function and a Packet Data Serving Node for high speed packet data services. It specifically represents the demarcation point between the PCF and the PDSN which coincides with the Reference Point "A_quater". This point establishes the technical interface and designates the test points and operational division of responsibility between the PCF and the PDSN. The PCF-PDSN interface is defined as the A10/A11 interface shown in Figure 2.2-1 and Figure 2.2-2.

The PCF-PDSN interface definition fulfills the following criteria:

• allows connection of various manufacturers' PCFs to the same PDSN and vice versa;

• makes maximum use of existing standards from the Internet Engineering Task Force (IETF) and other sources;

• promotes quality of service and accounting information exchange between the PCFs and the PDSNs;

• promotes reliability enhancement, technical innovation, network product availability, and economic competition;

• supports future PCF and PDSN implementations;

• allows the separate evolution of PCF and PDSN technologies.