Investigations of scheduling strategy for low data rate real time IP based service in wireless LAN

The paper introduces the modeling of IP based voice traffic and an investigation of the scheduling algorithms for this type of low data rate real time service in wireless LAN (WLAN) systems. We examine the HIPERLAN/2 system as a typical case. The problem of typical low system utilization for real time services by using inappropriate scheduling algorithms in broadband networks is revealed. Two approaches are proposed, one using variable sized protocol data units (PDU) and one utilizing alternating MAC frames for individual connections. The comparison between these two algorithms is given. It is concluded that the scheduling algorithm has a significant impact on system performance. Without changing the system structure, by alternating the MAC frame, a large number of users can be admitted in the wireless LAN system. The investigations can be applied to more extended low data rate real time services in WLANs.