Congestion control in a CDPA based multimedia network

Future mobile communications have to support multimedia services, operate in multi-cell environments and be able to operate in a multi-operator environments. Towards this end they have to maximise the utilisation of limited spectrum resources while trying to maintain quality of service (QoS) as demanded by multimedia services. This paper focuses on the support of multimedia services and guarantees QoS for these services through efficient call admission control (CAC), media access control (MAC) and related services, which avoid situations of congestion in the air media. Hence we define a congestion control entity (CCE) which enhances the operation of MAC and CAC. By assisting CAC to make an intelligent decision as to whether to admit a call or not we avoid the situation which leads to congestion. By controlling media access among a number of contending users we can implement congestion control by two means. One is by sensing or predicting situations leading to congestion from the present status of traffic and buffer availability; the other scheme is reactive and implements recovery from near congestion situations