WiMAX中基于跳数和信道感知的自适应差错控制机制

Adaptive Error Control Protocol Based on Hops and Channel Awareness in WiMAX Networks

针对在WiMAX网络中系统资源有限的条件下,如何提高资源利用率同时提供服务质量需求保障等问题,提出了基于跳数与信道质量感知的自适应差错控制机制;根据基于IEEE 802.16e的传统ARQ机制,综合考虑了影响无线数据传输的跳数和信道质量等因素建立了感知分析模型,在此基础上得出QoS随ARQ与HARQ的变化规律,从而根据跳数和信道感知的门限值确定最佳差错控制方案;数学分析和仿真实验表明,所提策略在系统吞吐量、实时性和可靠性等方面,表现出了比传统ARQ和HARQ更优越的性能。

Under the circumstances of limited resource in WiMAX, efficient error control protocol to meet QoS requirements and maxi- mize resource utilization become crucial. Therefore, the adaptive error control protocol based on hops and channel aware was proposed. Ac- cording to principle of conventional ARQ in IEEE 802. 16e, the mathematical analyses model was provided, which is used to research the in- fluence of data transmission in wireless communication system. An adaptive error control protocol was established based on the awareness model, which is able to selecting the best error control protocol based on the thresholds of hops and channel condition adaptively and guaran- tee the diversity of the quality of service. The mathematical analyses and simulation results show that the proposed mechanism could perform better in terms of system throughput, real time performance and reliability, compared to the conventional ARQ alone and hybrid ARQ alone.