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Slot Allocation Algorithms In Centralized Scheduling Scheme For Ieee 802.16 Based Wireless Mesh Networks

机译：基于Ieee 802.16的无线网状网络集中调度方案中的时隙分配算法

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摘要

In IEEE 802.16 based wireless mesh networks (WMNs), TDMA (Time Division Multiple Access) is employed as the channel access method and only TDD (Time Division Duplex) is supported and there are no clearly separate downlink and uplink subframes in the physical frame structure. As the uplink and downlink traffic has different characteristics in that the uplink traffic decentralizes in each MSS (Mesh Subscriber Station) and the downlink traffic centralizes in the MBS (Mesh Base Station), different scheduling methods should be taken in the uplink and downlink. This paper presents a uniform slot allocation algorithm which is suitable for both uplinks and downlinks. To achieve higher spatial reuse and greater throughput and to avoid switching frequently between receiving and transmitting within two adjacent time slots when a relay node forwards traffic, different link selection criteria are taken into account when allocating slots for uplinks and downlinks. A combined uplink and downlink slot allocation algorithm is proposed for further improving the spatial reuse and network throughput. The proposed algorithms are evaluated by extensive simulations and the results show that it has good performance in terms of spatial reuse and network throughput. To the best of the authors' knowledge, this work is the first one that considers combined uplink and downlink slot allocation on the centralized scheduling scheme in IEEE 802.16 based WMNs.
机译：在基于IEEE 802.16的无线网状网络（WMN）中，采用TDMA（时分多址）作为信道访问方法，并且仅支持TDD（时分双工），并且在物理帧结构中没有明显分开的下行子帧和上行子帧。由于上行链路和下行链路业务具有不同的特性，因为上行链路业务在每个MSS（网格用户站）中分散，而下行链路业务在MBS（网格基站）中集中，因此在上行链路和下行链路中应采用不同的调度方法。本文提出了一种适用于上行链路和下行链路的统一时隙分配算法。为了实现更高的空间重用性和更大的吞吐量，并避免在中继节点转发流量时在两个相邻时隙内的接收和发送之间频繁切换，在为上行链路和下行链路分配时隙时要考虑不同的链路选择标准。提出了一种组合的上下行时隙分配算法，以进一步提高空间复用和网络吞吐量。通过大量的仿真对所提出的算法进行了评估，结果表明该算法在空间重用和网络吞吐量方面都具有良好的性能。据作者所知，这项工作是第一个考虑在基于IEEE 802.16的WMN中集中调度方案上组合上行链路和下行链路时隙分配的工作。

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