| 摘要: |
| 就同时包含了有线链路和无线链路的异构网络上的实时应用,提出了一种满足其端到端服务质量(QoS)需求的无线网络MAC(media access control)层调度算法(real-time cross-layer scheduling algorithm for real-time application,简称RTCLA).该算法采用跨层的思想,结合了自适应调制编码(adaptive modulation and coding,简称AMC)技术和选择性自动请求重传(selective repeat-aut |
| 关键词: 跨层 调度算法 无线网络 性能 实时应用 |
| DOI： |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant Nos.60603060, 60502037, 90604019 (国家自然科学基金); the National Basic Research Program of China under Grant No.2003CB314806 (国家重点基础研究发展计划(973)) |
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| A Cross-Layer Scheduling Algorithm for Real-Time Applications in Wireless Networks |
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HAO Dan-Dan,ZOU Shi-Hong,CHENG Shi-Duan
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| Abstract: |
| This paper proposes a scheduling algorithm, RTCLA (real-time cross-layer scheduling algorithm for real-time application), at MAC layer for real-time applications traversing heterogeneous networks including wired and wireless links. RTCLA is a cross-layer algorithm, combined with adaptive modulation and coding (AMC) and selective repeat-automatic repeat request (SR-ARQ). It is designed to improve spectrum utilization when satisfying packet error rate (PER) and delay requirements. Simulations are employed to evaluate the performance of RTCLA in three metrics including system packets time-out rate, average system effective throughput and fairness and it is compared with the modified proportional fair (MPF), the earliest deadline first (EDF) and the modified largest weighted delay first (M-LWDF) algorithms. Simulation results show that RTCLA outperforms MPF, EDF and M-LWDF algorithms in terms of the strict delay requirements of real-time applications, scarcity of spectrum and the time-varying channels, especially in the performance of packet time-out rate. Furthermore, the simulation results show that RTCLA performs the same as other three algorithms in stability. |
| Key words: cross-layer scheduling algorithm wireless networks performance real-time application |
