Abstract—Architecture of the next g

Abstract—Architecture of the next generation telecommunication network is based on the separation of functionality into independent layers: control layer, a connectivity layer and an application layer. BICC and other Call Control Protocols share the resources in the connectivity layer. The connectivity layer handles the transport and manipulation of user and control data and comprises transport backbone elements and Media Gateways. Media Gateways have been introduced to provide bearer control function and media mapping/switching functions. Resource reservation for Bearer Independent Call Control protocol has most important role in the call set-up. The paper gives a detailed overview of bearer set-up procedures in ATM and IP networks based on BICC ITU-T recommendations.
I. INTRODUCTION
When two Media Gateways (MGW) need to set up an communication path over backbone using Asynchronous Transfer Mode (ATM) or Internet Protocol (IP) as a technology Fig. 1, they need to obtain and exchange information about the Bearer Interworking Function Address (BIWF), Backbone Network Connection Identifier (BNC-id), IP addresses, port numbers, codecs that will be used for the speech compression, media streams, etc. BICC using different mechanism for this purpose depending on the transport technology used in the call, but the problems obtaining necessary information and establishing communication path between two MGWs are the similar for the both transport technology.
BICC protocol has its own place in the next generation network as a call control protocol and there is a possibility for interwork with other call control protocols in such network [4]. BICC is the call control protocol chosen for the 3rd Generation Partnership Project Circuit Switched domain (3GPP CS) Release 4. This paper gives an overview of the capabilities for the resource network reservation in the connectivity layer for the MGWs terminations Fig. 1 in BICC protocol and tries to explain the conceptual and architectural differences between different transport technologies used in the call scenario.