Volume 37, Number 4, August 2019
|Page(s)||809 - 815|
|Published online||23 September 2019|
Multiple BSSs Association Based Spatial Clustering Group Access Protocol for Next Generation WLAN
School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China
The next generation Wireless Local Area Network (WLAN) IEEE 802.11be regards Extremely High Throughput (EHT) as its core technology goal, among which multi-band capability and AP cooperation technology are regarded as its key technologies. However, the existing research on Orthogonal Frequency Division Multiple Access (OFDMA) protocol does not consider the multi-band capability and AP collaboration technology of IEEE 802.11be, so the improvement of system performance is limited and does not meet the EHT requirement. Especially when the nodes in overlapping coverage area have a large number of traffic, it is more important to improve the throughput of nodes in overlapping coverage area. In order to improve the throughput of nodes in overlapping coverage area, this paper proposes a spatial clustering group OFDMA protocol associated with multiple Basic Service Sets (BSSs). The protocol allows nodes in overlapping coverage area to be associated with multiple BSSs at the same time by using multi-band capability, that is, multi-association; Using AP collaboration technology allows nodes to perform parallel backoff with channels on multiple BSSs to improve access efficiency. Nodes in the overlapping coverage area are associated with the channels of multiple BSSs for parallel backoff. Node completed backoff and successfully accessed triggers a spatial clustering group (SCG) with close to its spatial location. OFDMA mode is used by SCG to access and transmit, thus increasing the access opportunities of nodes within overlapping coverage, thereby improving the throughput. The simulation results show that using the SCG-OFDMA protocol proposed in this paper associated with two BSSs, its throughput of nodes within overlapping coverage can achieve 353.41% higher than the IEEE 802.11ax protocol and 558.33% higher than the OMAX protocol respectively.
下一代无线局域网（wireless local area network，WLAN）IEEE 802.11be将超高吞吐量（extremely high throughput，EHT）作为其核心技术目标，其中多频段能力和AP协作技术被视为其关键技术。然而，现有正交频分多址接入（orthogonal frequency division multiple access，OFDMA）协议的研究并没有考虑IEEE 802.11be的多频段能力和接入点（access point，AP）协作技术，因此对于系统性能的提升是有限的，无法达到技术要求。尤其在重叠覆盖区域内节点有大批量业务的情况下，提升重叠覆盖区域内节点吞吐量显得更为重要。为了提升重叠覆盖节点的吞吐量，提出一种关联多小区的空间聚集群组OFDMA协议。利用多频段能力，允许重叠覆盖区域内的节点同时关联到多个小区，即多关联。利用AP协作技术，允许节点在多个小区上执行并行退避以提升接入效率。重叠覆盖区域内的节点关联到多个小区的信道进行并行退避，完成退避并成功接入信道的节点触发与其空间位置接近的节点形成空间聚集群组，采用OFDMA的方式接入与传输，从而增加重叠覆盖节点的接入机会，进而提升重叠覆盖节点的吞吐量。仿真结果表明，提出关联多个小区的SCG-OFDMA协议在关联2个小区的场景下，重叠覆盖节点吞吐量高于IEEE 802.11ax协议353.41%，高于OMAX协议558.33%。
Key words: next generation WLAN / multi-band / multiple BSSs association / spatial clustering group / media access control / IEEE 802.11be
关键字 : 下一代无线局域网 / 多频段 / 关联多小区 / 空间聚集群组 / 多址接入协议 / IEEE 802.11be
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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