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Energy-efficient adaptive GTS allocation algorithm for IEEE 802.15.4 MAC protocol
Telecommunication Systems ( IF 2.5 ) Pub Date : 2020-09-23 , DOI: 10.1007/s11235-020-00719-0
Manoj Tolani , A Sunny , Rajat Kumar Singh

The standard IEEE 802.15.4 fails to perform optimally for railway monitoring applications due to the deficiency of guaranteed time slots (GTSs). In the present work, an adaptive GTS allocation algorithm (AGAA) is proposed which efficiently deals with a deficiency of GTSs and slot underutilization problem. The proposed AGAA algorithm saves unutilized bandwidth of GTS and the saved bandwidth is utilized by the needy nodes in contention access period (CAP) and contention-free period (CFP). An independent superframe order (\(SO_{CFP}\)) is introduced for adaptive adjustment of slot size in the CFP. The proposed AGAA protocol also deals with the problem of GTS request-failure due to congestion during CAP. A separate contention period is used for GTS request in AGAA protocol. The comparison has been done between the proposed AGAA protocol and the standard IEEE 802.15.4 medium access control (MAC) protocol. Throughput and energy consumption are analyzed and results show that the slot optimization using \(SO_{CFP}\) saves a fair amount of bandwidth which improves the throughput of the network \(\approx \) 22%. Moreover, the separate contention period for the GTS request frame reduces the idle state energy consumption of those devices which generate time-constraint data frames. The proposed AGAA protocol consumes \(\approx \) 18% less energy than the standard IEEE 802.15.4 MAC protocol. The analysis of results also reveals an important fact that the algorithm saves more energy for homogeneous traffic in comparison to heterogeneous traffic which can further be improved in future works.



中文翻译:

IEEE 802.15.4 MAC协议的高能效自适应GTS分配算法

由于缺少保证时隙(GTS),因此标准IEEE 802.15.4无法在铁路监控应用中达到最佳性能。在目前的工作中,提出了一种自适应GTS分配算法(AGAA),该算法可以有效地解决GTS的不足和时隙利用不足的问题。所提出的AGAA算法节省了GTS的未利用带宽,并且所节省的带宽在竞争访问时段(CAP)和无竞争时段(CFP)中被有需要的节点利用。独立的超帧顺序(\(SO_ {CFP} \)引入)是为了自适应调整CFP中的广告位尺寸。提议的AGAA协议还处理由于CAP期间的拥塞而导致的GTS请求失败的问题。AGAA协议中的GTS请求使用单独的争用期。已在建议的AGAA协议和标准IEEE 802.15.4媒体访问控制(MAC)协议之间进行了比较。分析了吞吐量和能耗,结果表明,使用\(SO_ {CFP} \)进行的插槽优化可节省大量带宽,从而将网络吞吐量提高22%。此外,用于GTS请求帧的单独竞争周期减少了那些生成时间受限数据帧的设备的空闲状态能耗。拟议的AGAA协议消耗了\(\ approx \)比标准IEEE 802.15.4 MAC协议节省18%的能量。结果分析还揭示了一个重要事实,即与异构流量相比,该算法为同类流量节省了更多能量,可以在以后的工作中进一步加以改进。

更新日期:2020-09-23
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