Method for avoiding network congestion in transmission process of 802.11 polling type data

Abstract

The invention discloses a method for avoiding the network congestion in transmission process of 802.11 polling type data. The method comprises the following steps of: after association of an infrastructure BSS (Basic Service Set) network at the STA and before polling of the STA by adopting a point coordination function (PCF) or a hybrid coordinate controlled channel access (HCCA) mode through an access point (AP) of the infrastructure BSS network, respectively affiliating the alternative each STA in the infrastructure BSS network to at least one priority group; and polling the STA by adopting the PCF or the HCCA mode and transmitting data according to the priority group in which each STA is arranged. According to the method discloses by the invention, before the STA is polled by adopting the PCF or the HCCA mode and the data are transmitted, various STAs in the infrastructure BSS network are classified according to the priority by adopting a mode of the priority group; and when the polling for a large amount of STAs and the data transmission are carried out, under the condition that the network congestion is avoided, part of important STAs in high priority can be ensured to be preferably polled or polled for multiple times so as to finish data transmission at the earliest and avoid the network congestion.

Description

technical field [0001] The invention relates to the field of wireless network transmission, in particular to a method for avoiding network congestion during 802.11 data transmission. Background technique [0002] 802.11 (its commercial promotion brand is Wi-Fi) is a short-distance high-speed wireless local area network standard formulated by IEEE (Institute of Electrical and Electronics Engineers, the Institute of Electrical and Electronics Engineers). With the rapid development of the Internet (Internet), 802.11 has been popularized and developed on a large scale, and is widely used in computers, mobile phones and various consumer electronic products. 802.11 products widely use the two shared free frequency bands of 2.4GHz and 5GHz. [0003] 802.11 has two network architectures: one is Independent BSS (Independent Basic Service Set, independent basic service set) architecture, under this architecture, STA (St-tion, station, STA in WLAN (Wireless Local Area Networks, wirele...

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Problems solved by technology

[0020] The 802.11 system before 802.11ah is mainly designed considering the H2H communication (Human to Human communication, everyone communication), and it is not suitable for the transmission mode of the above M2M communication: First, in the 802.11 system before 802.11ah, an AP can support up to Hundreds of STAs, 802.11ah AP considers the transmission of thousands of STAs, and needs to improve the access method and transmission method; secondly, in the existing 802.11 network, the transmission of 802.11 STA services is more triggered by humans, Therefore, it has a certain degree of randomness, and the possibility of a large number of STAs transmitting data at the same time is very small, but for 802.11ah STAs, it may be based on periodic or event-based triggers to transmit data, so there may be a large number of STAs transmitting data at the same time, regardless of the use of The existing PCF or HCCA method for data transmission will greatly increase the probability of conflict, resulting in congestion of the 802.11ah network

[0021] Although in M2M application scenarios, 802.11ah networks may be more deployed by industry users, and industry users can make certain settings at the application layer to disperse 802.11STA access and data transmission, but the settings at the application layer may not be sufficient

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