Method for controlling wireless network access

Abstract

The invention discloses a wireless communication system, which is provided with a control node and a plurality of user nodes, wherein each user node is provided with respective priority; the user nodes can access a channel in a universal access time period and special access time periods which correspond to the respective priority; in the universal access time period, each user node accesses the channel in a carrier sense multiple access / collision avoidance (CSMA / CA) mode; each special access time period has the corresponding priority; each special access time period can correspond to one or more priorities through system configuration; and when one special access time period corresponds to only one priority, only the user node which corresponds to the priority are allowed to access the channel in the current special access time period.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a wireless network access control method. Background technique [0002] Traditional wired networks usually adopt Carrier Sense Multipoint Access / Collision Detection (CSMA / CD) as the standard of the MAC layer. Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA) is an improved MAC layer protocol proposed for the characteristics of WLAN. On the one hand, check whether the medium is idle through carrier sense; on the other hand, introduce random backoff interval waiting to minimize the probability of signal collision. Carrier sense multipoint access / collision avoidance is a MAC protocol based on the contention mechanism, which can play its role to the greatest extent when the network condition is good, but in the case of network congestion, there will inevitably be a large number of access collision. [0003] Since the backoff interval used by carrier sense mu...

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Problems solved by technology

Carrier sense multipoint access / collision avoidance is a MAC protocol based on the contention mechanism, which can play its role to the greatest extent when the network condition is good, but in the case of network congestion, there will inevitably be a large number of access the collision

[0003] Since the backoff interval used by carrier sense multi-point access / collision avoidance is randomly selected from a contention window with a lower limit of zero, the contention windows of users with different priorities still have overlapping values. In this case, the possibility of collision is still relatively high, and only by adjusting the upper limit value range of the contention window cannot reflect the difference in services between users with different priorities

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