A Novel Downlink Handover-Based Priority Scheduling for Providing Seamless Mobility and QoS in IEEE ۸۰۲.۱۶ BWA System

In IEEE ۸۰۲.۱۶ wireless metropolitan area networks, users can take their broadband connections with them as they move from one location to another with different speeds. Thus, providing seamless handovers and QoS (Quality-of-Service) is challenging, especially for mobile subscribers at vehicular speeds. On the other hand, time variability and unpredictability of the wireless channel may cause QoS degradation and handover losses for these users. This paper proposes a new downlink handover-based priority scheduling scheme for different scheduling services which is providing lossless handovers and QoS. Taking the power degradation rates into consideration that enables monitoring users' locations, speeds and accelerations, this scheme assigns higher priority to the users having higher probability performing handover in the near future. An AMC (Adaptive Modulation and Coding) scheme and a pre-selection method are also proposed for providing high system performance, i.e., higher system throughput and lower packet dropping rate. The analytical results show the efficiency of proposed scheme.

کلیدواژه ها:

AMC ، Handover ، IEEE ۸۰۲.۱۶ ، Quality of service ، scheduling