Admission Control forPollingServicesinIEEE 802.16 Broadband WirelessNetworks

Although themediumaccess control (MAC)protocol andthephys- ical layer arewelldefined inIEEE802.16 standard, bandwidth allo- cation (BA)andconnection admission control (CAC)remain asopen research issues. Inthis paper, wepresent ajoint adaptive bandwidth allocation andconnection admission control methodforreal-time and non-real-time polling services intheIEEE802.16-based broadband wireless networks whichuseadaptaive modulation andcoding atthe physical layer. Thismethodisbasedonanoptimization-based ap- proach wherethein-connection (i.e., packet-level) performances (i.e., delay andtransmission rateforreal-time andnon-real-time polling ser- vices, respectively) areusedascostfunctions anddecision criteria for allocating bandwidth andforaccepting orblocking anewconnection, respectively. A queueing modelisusedtoanalyze transmission delay andtransmission rateunderadaptive modulation andcoding. Binary integer programming isusedtoobtain thesolutions fortheoptimiza- tion formulation. Typical performance results demonstrate thesuperi- ority oftheproposed scheme overtraditional static andadaptive band- widthallocation schemes.