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论文:2020,Vol:38,Issue(1):155-161 |
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杨桉楠, 李波, 杨懋, 闫中江. 下一代WLAN中一种基于分组的上行OFDMA随机接入方法[J]. 西北工业大学学报 |
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YANG Annan, LI Bo, YANG Mao, YAN Zhongjiang. Group-Based Uplink OFDMA Random Access Algorithm for Next-Generation WLANs[J]. Northwestern polytechnical university |
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| 下一代WLAN中一种基于分组的上行OFDMA随机接入方法 |
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| 杨桉楠, 李波, 杨懋, 闫中江 |
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| 西北工业大学 电子信息学院, 陕西 西安 710072 |
| 摘要: |
| 传统的无线局域网（wireless local area network，WLAN）标准IEEE 802.11采用载波侦听/冲突避免机制，允许单个用户竞争信道接入。而即将到来的下一代WLAN标准IEEE 802.11ax，将正交频分多址（orthogonal frequency division multiple access，OFDMA）技术和随机接入相结合，在上行传输中可以采用上行OFDMA随机接入（uplink OFDMA random access，UORA）技术，允许多个用户同时随机接入信道传输数据，因此提高了网络的资源利用率。虽然IEEE 802.11ax中的UORA技术具有信令开销小的优点，但是当用户数较多的时候，随机接入的冲突增加会导致网络吞吐量下降。因此，提出一种分组UORA的接入方法，无线接入点（access point，AP）作为中心调度节点对用户和资源进行分组，为不同组的用户和资源设置不同的标签，用户只能随机接入具有相同标签的资源。通过建立数学模型和仿真的方法，验证了分组UORA方法的有效性。分组UORA方法的网络吞吐量较IEEE 802.11ax中的原始UORA有所提升，因此具有一定的实际意义。 |
| 关键词:
无线局域网
正交频分多址接入
上行OFDMA随机接入
分组
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| Group-Based Uplink OFDMA Random Access Algorithm for Next-Generation WLANs |
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| YANG Annan, LI Bo, YANG Mao, YAN Zhongjiang |
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| School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| The traditional wireless local area network(WLAN) standard, IEEE 802.11, adopts carrier sense multiple access/collision avoidance(CSMA/CA) mechanism to allow a single user to compete for channel access. The upcoming WLAN standard, IEEE 802.11ax, combines orthogonal frequency division multiple access(OFDMA) technology with random access, and use Uplink OFDMA Random Access(UORA) technology as uplink random access. Therefore, UORA which allow multiple users to access channel at the same time can improve the utilization of network resources. Although UORA technology in IEEE 802.11ax has the advantage of low signaling overhead, when the number of users of network is large, the increase of random access collisions will lead to the decrease of network throughput. Therefore, we propose a group-based UORA method. As a central scheduling node, Access Point(AP) divide Stations(STAs) and resources to groups and sets different GroupID for different groups. STAs can only access resources with the same GroupID randomly. The validity of group-based UORA method is verified by mathematical model analysis and simulation. The network throughput of our group-based UORA is higher than that of the original UORA in IEEE 802.11ax, so it has great practical significance. |
| Key words:
wireless local area network(WLAN)
orthogonal frequency division multiple access(OFDMA)
uplink OFDMA random access
grouping
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| 收稿日期: 2019-03-15
修回日期:
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| DOI: 10.1051/jnwpu/20203810155 |
| 基金项目: 国家自然科学基金（61771390，61871322，61771392，61501373）与国家科技重大专项（2016ZX03001018-004）资助 |
| 通讯作者:
Email： |
| 作者简介: 杨桉楠(1981-),西北工业大学博士研究生,主要从事无线通信、数据链组网技术协议研究。
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| 作者相关文章 |
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| 杨桉楠 在本刊中的所有文章 |
| 李波 在本刊中的所有文章 |
| 杨懋 在本刊中的所有文章 |
| 闫中江 在本刊中的所有文章 |
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参考文献: |
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[1] IEEE P802.11 Working Group of the LAN/MAN Standards Committee of the IEEE Computer Society.IEEE 802.11ax Proposed Draft 4.0[EB/OL]. (2019-01-01)[2019-05-30]. http://standards.ieee.-org
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1．李勇, 李波, 杨懋, 闫中江, 屈桥.下一代WLAN中一种空间聚集群组的OFDMA接入协议[J]. 西北工业大学学报, 2018,36(5): 897-903 |
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