Method for avoiding network congestion in 802.11 competition type data transmission process

Abstract

The invention discloses a method for avoiding network congestion in a 802.11 competition type data transmission process. The method comprises the following steps that: making each sta-tion (STA) in an infrastructure basic service set (BSS) network respectively belong to at least one priority group; respectively setting a transmission factor to the each priority group; after the STA is associated in the infrastructure BSS network, before using a distributed coordination function (DCF) or an enhanced distributed channel access (EDCA) mode to compete a channel, determining whether the STA competes the channel according to the transmission factor of the priority group that the STA belongs to . In the method, before using the DCF or the EDCA mode compete the channel, the priority group mode is used to carry out priority classification to the each STA in the infrastructure BSS network. When a plurality of the STAs simultaneously carry out data transmission, on one hand, all the STAs can be guaranteed to carry out the data transmission according to a priority sequence of the STAs themselves so as to avoid the network congestion; on the other hand, the partial important STAs which are in the high priority can firstly complete the data transmission.

Description

technical field [0001] The invention relates to the field of wireless network transmission, in particular to a method for avoiding network congestion when 802.11 adopts a contention mode for 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 ...

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Problems solved by technology

[0036] The 802.11 system before 802.11ah is mainly designed considering H2H communication (Human to Human communication, everyone communication), and is not suitable for the transmission mode of the above-mentioned M2M communication: First, in the 802.11 system before 802.11ah, one AP supports at most There are hundreds of STAs, and 802.11ah AP considers the transmission of thousands of STAs, so it 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 , so 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, no matter Using the existing DCF or EDCA method for data transmission will greatly increase the probability of collision, resulting in congestion of the 802.11ah network

[0037] 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, but the settings at the application layer may not be sufficient

In addition, for emergencies (such as sudden power-on after power failure), a large number of STAs may have to transmit data at the same time. When a large number of STAs initiate transmission at the same time, the probability of collision will be greatly increased, resulting in network congestion.

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