A Latency and Modulation Aware Scheduling Solution for IEEE 802.16 Base Stations

Abstract

The mobile worldwide interoperability for microwave access (WiMAX) system provides high data rate, wide bandwidth for wireless network. However, the link quality is unstable owing to air interference and long-distance transmission. When link quality change, mobile node can revise the modulation and coding scheme (MCS) dynamically. Thus, we propose a modulation-aware scheduling solution for WiMAX base station (BS). It contains three primary methods: an admission control scheme (ACS), a scheduling algorithm, and a bandwidth allocation scheme. In addition to MCS, we also take latency for real-time service into account. The proposed admission control scheme calculates the admission condition based on different kinds of MCS and minimum reserved rate requirements. The modulation aware scheduling algorithm and bandwidth allocation scheme can allocate bandwidth more efficiently in the finite frame duration and guarantee the minimum quality of service (QoS) requirements to each admitted connection by translating the QoS requirements into time slots. Finally, our simulation results show that the proposed scheduling solution can improve the throughput of the entire network and guarantee the minimum QoS requirements to each admitted connection.