A Resource Allocation Method Based on Transmission Delay

Abstract

The present invention relates to the field of wireless communication, in particular to a resource allocation method based on transmission delay. The method includes generating the location of each station in the basic service group, and calculating the path loss according to the location of the station and the location of the access point; Channel state information between access points generates different channel gain matrices in continuous multi-frame transmission; calculates the uplink data transmission rate of each station in the station set in different resource blocks according to the generated channel gain matrix; based on the data transmission rate Calculate the transmission delay of each station in the station set according to the size of the data packet; aim at minimizing the transmission delay difference, and obtain the resource block allocation results of each station in the station set within the time length of determining the transmission opportunity; to maximize channel utilization The goal is to obtain the power distribution results of each station; the invention can solve the problem that the wireless local area network communication efficiency is significantly reduced due to the large number of base stations and the potential high data packet collision rate.

Description

technical field [0001] 本发明涉及无线通信领域,特别地,涉及802.11ax(第六代无线局域网标准)中基于OFDMA调度接入的多用户传输方式,考虑基于传输延迟的用户分组调度及资源分配方法。 Background technique [0002] 智能终端的日益繁荣和物联网(Internet of Things,IoT)应用的快速发展,促使一些高密度部署场景,如机场、体育馆、购物中心和企业等,发展成为未来无线网络的重要应用场景。在未来,一方面,无线网络需要在有限的地理区域内部署大量的无线接入点(Access Point,AP),以保证所需的覆盖范围和容量;另一方面,无线网络也需要支持单个小区中的大量连接,例如体育场中的智能手机、智能家居,或企业网络中的物联网设备。无线网络的密集部署,使得来自相邻设备的干扰将会大大增加,传统802.11协议基于载波侦听多路访问 / 冲突避免(Carrier Sense Multiple Access with Collision Avoidance,CSMA / CA)的信道访问机制,在密集场景下会造成竞争冲突加剧,从而导致网络性能下降严重,特别是MAC效率急剧下降。IEEE于2014年成立了802.11ax工作组,开始着手制定下一代WLAN标准802.11ax,草案7.0版本于2020年9月已发布,802.11ax又称为高效无线局域网(High Efficiency WLAN,HE WLAN)标准,主要是为了解决密集场景下的通信问题,以提升MAC效率,提高网络吞吐量。 [0003] 802.11ax区别于传统WiFi标准最大的不同是支持多用户传输,与上一代WiFi标准802.11ac相比,在技术上主要采取的改变有以下几点:采用更小的子载波间隔78.125KHz和更高阶的调制技术1024QAM,引入了上下行OFDMA和上行MU-MIMO技术支持上下行的多用户传输,采用频域划分资源单元的方法,以支持更多用户在同一时间节点并行传输,A-MSDU,A-PSDU,支持动态帧分片的帧聚合方式,空间复用,TWT节能等。其中基于OFDMA的上行多用户传输分为两种接入方式:UL基于OFDMA的调度接入(Uplink OFDMA based SchedulingAccess,UOSA)和UL基于OFDMA的随机接...

AI Technical Summary

Problems solved by technology

And 802.11ax stipulates that any user can only allocate one RU at most, but the RU division method is more flexible and the size is not fixed

Therefore, the transmission performance of the system largely depends on the grouping method of users for each transmission and how resources such as frequency power are allocated. Current research mainly focuses on the division of RUs, allocation combinations, and user grouping. Considering the system and rate or other The utility does not take the transmission delay under different user loads as an influencing factor, resulting in a significant decrease in wireless LAN communication efficiency due to the large number of base stations and the potential high packet collision rate

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