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美利体育登录入口官网:ETSI TS 148 002 V11.0.0 (2012-10)-2012
数字蜂窝电信系统（第2+阶段） 基站系统 移动业务交换中心（BSS MSC）接口 接口原理（3GPP TS 48.002 版本 11.0.0 发行版 11）

Digital cellular telecommunications system (Phase 2+); Base Station System - Mobile-services Switching Centre (BSS - MSC) interface; Interface principles (3GPP TS 48.002 version 11.0.0 Release 11)

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标准号

ETSI TS 148 002 V11.0.0 (2012-10)-2012

发布

2012年

总页数

20页

发布单位

欧洲电信标准协会

 

 

引用标准

RTS/TSGG-0248002vb00

 

 

本体

A接口 基站子系统

适用范围

本文件规定了3GPP TS 48.0xx系列技术规范中详细接口规范所依据的原则。通过该接口实例访问的一套固定美利体育官网首页网址称为基站子系统（BSS）。BSS确保n个小区的覆盖，其中n可以等于1或更多。BSS的功能可进一步细分为由基站控制器（BSC）执行的控制功能和由“n”个基站收发台美利体育官网首页网址（BTS）（每个小区一个）执行的收发功能。然而，这种划分的研究不在48.0xx系列技术规范的范围内，其中BSS将被视为一个整体。在3GPP TS 48系列技术规范中定义的BSS-MSC接口旨在支持两端的各种可能架构。诸如转码器/速率适配器的位置是在移动站（MSS）还是在BSS内（物理上集成在收发器中或靠近MSC），或在任一侧使用流量或信令集中等特征由运营商选择。本文件的附件A包含有关使用远程移动交换单元（RMSU）的指南信息，就本文件而言，这些单元被视为MSC的一部分。BSS-MSC接口通常称为'A-接口'。它分为控制平面（信令）和用户平面（流量）。 throughout this document the term 'MSC' is used to reflect both planes of the Mobile Core Network, although in some architecture the Mobile Core Network is split into MSC-Server (MSC-S) and Media Gateway (MGW). Direct connection between two BSSs is not supported by this A-Interface. This A-Interface may be based on - TDM using 1 or more 2 048 kbit/s digital transmission system interfaces. Each 2 048 kbit/s interface provides 31*64 kbit/s channels which can be used for traffic (User Plane) or signalling (Control Plane) as the operator requires, and/or - IP supporting User Plane and/or Control Plane (SIGTRAN).The signalling is layered, terminology similar to that in the OSI reference model is used in this series, however the layers referred to are not identical to the equivalently named layer in the OSI model. This A-Interface User Plane is defined at the boundary of the MSC and - in case of TDM, it has a per channel bit rate of 64 kbit/s, but the net radio path traffic channel is at a rate of less than 16 kbit/s. A speech transcoder or data rate adapter function is thus needed for the rate conversion. The interface is designed such that the transcoding or rate adaptation function may be geographically situated at either the MSC site or the BSS site, however the transcoder is considered to be part of the BSS - in case of IP, it has a flexible channel bit rate, adapted to the payload size. The speech transcoding function can be part of either the BSS or the Core Network or can be omitted (transcoding free operation), allowing e.g. for use of both, PCM encoded speech and compressed speech, over the A-Interface. The data rate adapter function is always located inside the BSS, using a 64kbit/s unrestricted digital interface (Clearmode) over IP. The A-Interface has been designed around the aims of 3GPP TS 48.001 allowing each component and the system as a whole to evolve.

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