Bandwidth management for AAL2 traffic

Bandwidth management in AAL2 networks is investigated mainly from the traffic performance point of view. AAL2 is a new asynchronous transfer mode (ATM) adaptation layer. Since it is designed to carry low-bit-rate voice signals efficiently, it should be used in the ATM backbone for mobile networks, especially in the IMT-2000 network (International Mobile Telecommunication in the Year 2000 network). Three alternatives for bandwidth management, which differ in the way the ATM layer service is used and how admission of AAL2 connections to a virtual channel (VC) is judged, are shown and their performances are evaluated theoretically. The best performance is obtained by the alternative of using unspecified bit rate VCs and judging admission of AAL2 connections to a virtual path. The advantage of using a variable bit rate is found to be limited. The effectiveness of introducing AAL2 switching nodes is also shown.