Resource Allocation for High-Reliability Low-Latency Vehicular Communications With Packet Retransmission
Resource Allocation for High-Reliability Low-Latency Vehicular Communications With Packet Retransmission
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DOI：
10.1109/tvt.2019.2919181
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发表时间：
2019-05
影响因子：
6.8
通讯作者：
Chongtao Guo;Le Liang;Geoffrey Y. Li
中科院分区：
文献类型：
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作者：
Chongtao Guo;Le Liang;Geoffrey Y. Li
在车载通信中，对安全至关重要的信息交换具有严格的可靠性和延迟要求。然而，由于高移动性，缺乏准确的瞬时信道状态信息，这对满足这些要求提出了很大的挑战，当考虑分组重传时，情况变得更加复杂。仅基于大规模衰落信道信息，进行频谱和功率分配，在保证V2V链路可靠性和时延要求的前提下，最大限度地提高V2I链路的总遍历容量。首先，针对每个可能的V2I-V2V频谱复用对，分析了V2V链路的排队系统，得到了固定功率分配下的丢包概率和平均包停留时间。然后，为每个可能的配对导出最优功率分配。然后，我们通过解决多项式时间可解的二部匹配问题来优化频谱复用模式。仿真结果验证了所提出的排队分析方法的准确性。此外，所提出的资源分配策略可以在保证V2V链路可靠性和时延要求的前提下，提高V2I链路的遍历能力。
In vehicular communications, safety-critical information exchange has stringent reliability and latency requirements. However, lack of accurate instantaneous channel state information due to high mobility poses a great challenge to meet these requirements and the situation gets more complicated when packet retransmission is considered. Based on only large-scale fading channel information, we perform spectrum and power allocation to maximize the sum ergodic capacity of vehicular-to-infrastructure (V2I) links, while guaranteeing reliability and latency requirements of vehicular-to-vehicular (V2V) links. First, for each possible V2I–V2V spectrum reusing pair, we analyze the queueing system for the V2V link and derive the packet loss probability and average packet sojourn time under fixed power allocation. Then, an optimal power allocation is derived for each possible pair. Afterwards, we optimize the spectrum reusing pattern by addressing a polynomial time solvable bipartite matching problem. Simulation results confirm the accuracy of the proposed queueing analysis. Moreover, the proposed resource allocation strategy can improve the ergodic capacity of the V2I links under the precondition of guaranteeing the V2V links’ requirements on reliability and latency.