Adaptive Contention Resolution forVoIPServices intheIEEE802.16 Networks
Alexander Sayenko · 2007
isgiven in[5]. Thestandard defines twobasic operational modes: point-to-multipoint (PMP)andMesh.WhileasubIntheIEEE802.16 networks, asubscriber station can scriber station (SS)cancommunicate withother SSsinthe usethecontention slots tosendbandwidth requests tothe Meshmode,itisallowed tocommunicate onlythrough the basestation. Thecontention resolution mechanism iscon- basestation (BS)inthePMP mode.Itisanticipated that trolled bythebackoff start/end values andanumberofthe providers will usethePMP modetoconnect customers to request transmission opportunities. These parameters are theInternet [10]. Inthis case, aprovider cancontrol the setbythebasestation andareannounced tosubscriber sta- environment toensure theQoSrequirements ofcustomers. tions inthemanagement messages. InthecaseoftheVoIP Recently, theIEEE802.16e standard [2]defined mobile exservices, itiscritical that thecontention resolution occurs tensions whichopened apossibility tobuild mobile wireless within thespecified timeinterval tomeettheVoIPQoSre- VoIPterminals andembedWiMAX into mobile phones and quirements. Thus, itistheresponsibility ofthebasestationpersonal dataassistants. tosetcorrect contention resolution parameters toensure the WiMAX provides arich setofscheduling classes tosupQoSrequirements. This paper presents analytical calculations fortheparameters that control thecontention resolu-por esuwith is traffic profi estan requie nt tion process intheIEEE802.16 WiMAXnetworks. Thesim- asarsult, ther isln u ecices ft sheduing