【資料名稱】：Functionality of AMR and EFR

【資料作者】：NSN

【資料日期】：2011.10

【資料語言】：英文

【資料格式】：DOC

【資料目錄和簡介】：

A circuit pool is a group of circuits supporting a set of channel modes and related speech codec algorithms. There may be several circuit pools per one BSS.
In assignment or external handover, the MSC selects a circuit from the circuit pool, which corresponds as well as possible to the requested radio channel type. The assignment procedure or the handover procedure is successful when the A circuit is compatible with
•the current traffic channel (TCH) radio resource configuration and
•the resource situation in the BTS.
On the other hand, during the completion of assignment or handover, the BSC can send the circuit pool information to the MSC with which it is able to find out the possible circuit pool type mismatches. There can be a more suitable pool in relation to the allocatable radio resources although the current A circuit would be compatible with the allocated TCH type.
The A interface speech circuits (CIC) are divided into pools (CIP) according to the TCSM capabilities. The main factors when dividing the circuits into pools is the channel rate and the speech codecs supported.
Table 2lists the pools that support EFR and Table 3 lists the pools that support AMR.