A Hybrid Adaptive Channel Access (HyACA) Mechanism for LTE-U and WiFi Coexistence Systems
A Hybrid Adaptive Channel Access (HyACA) Mechanism for LTE-U and WiFi Coexistence Systems
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用于 LTE-U 和 WiFi 共存系统的混合自适应信道接入 (HyACA) 机制
DOI：
10.1109/jsyst.2020.3016947
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发表时间：
2021-09
影响因子：
4.4
通讯作者：
Baoxian Zhang
中科院分区：
文献类型：
--
作者：
Jie Xiao;Jun Zheng;Baoxian Zhang
为了提高LTE-U和WiFi共存系统的信道接入性能，本文提出了一种混合自适应信道接入（HyACA）机制。为了支持HyACA机制，首先在共存系统中引入了修改后的时频信道结构和修改后的LBT功能，用于信道访问。为了保证信道访问的公平性，进一步提出了动态信道切换（DCS）功能和自适应几乎空白子帧（AABS）功能来控制不同业务负载下的信道访问。在低流量负载下，HyACA使用DCS功能。在高流量负载下，HyACA使用AABS功能。为了判断共存系统的业务负载状态，引入了基于平均信道占用时间的判据，并推导了确定平均信道占用时间的计算模型。此外，还推导了另一种计算模型，用于计算在一个帧块的每个LTE-U帧中需要保留的ABSs的数量。仿真结果表明，所提出的HyACA机制在保证访问公平性的同时，具有比静态ABS机制更好的公平性和吞吐量性能，比LAA Cat.3 LBT机制更好的吞吐量性能。
This article proposes a hybrid adaptive channel access (HyACA) mechanism for improving the channel access performance of an LTE-U and WiFi coexistence system. To support the HyACA mechanism, a modified time-frequency channel structure as well as a modified LBT functionality is first introduced for channel access in the coexistence system. To ensure channel access fairness, a dynamic channel switch (DCS) functionality and an adaptive almost-blank-subframe (AABS) functionality are further proposed to control the channel access under different traffic loads. Under low traffic load, HyACA uses the DCS functionality. Under high traffic load, HyACA uses the AABS functionality. To judge the traffic load status of the coexistence system, a criterion based on the average channel occupation time is introduced, and a calculation model is derived to determine the average channel occupation time. Moreover, another calculation model is derived to calculate the number of ABSs to be reserved in each LTE-U frame of a frame block. Through simulation results, it is demonstrated that the proposed HyACA mechanism can achieve better fairness and throughput performance than the static ABS mechanism, and better throughput performance than the LAA Cat.3 LBT mechanism while ensuring access fairness.
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