SIR-based call admission control by intercell interference prediction for DS-CDMA systems

A new signal-to-interference ratio (SIR)-based call admission control (CAC) scheme is proposed in DS-CDMA systems. In this scheme, a new call is accepted by a base station (BS) if the SIRs at that specific base station (BS) and its nearby, not necessarily adjacent, BSs can be guaranteed to be higher than some threshold value after accepting the new call. The SIRs of the nearby BSs can be guaranteed by predicting the additional intercell interference the new call will produce if it is accepted by the specific BS. Numerical results show that this scheme outperforms previous SIR-based CAC schemes.