Efficient transmission of multicast MAP in the IEEE 802.16e

Abstract

The IEEE 802.16e suggests the use of multicast sub-MAPs whose messages are differently encoded according to the operating condition. In this case, it is desired for the base station to properly choose a modulation and coding set (MCS) associated with operating condition. In this paper, we consider the use of an adaptive modulation coding (AMC) scheme for the multicast sub-MAP that achieves the same MAP coverage as the broadcast MAP while minimizing the signaling overhead. We consider the adjustment of the threshold for the AMC according to the channel condition without explicit information on the channel condition, significantly reducing the amount of the signaling overhead. Simulation results show that when it is applied to voice-over-IP (VoIP) services, the proposed scheme can enhance the VoIP capacity.