A channel access method and site under spatial multiplexing

Abstract

A channel access method and a station under spatial multiplexing, including detecting the first wireless signal of a third-party station by the listening station, updating the local network allocation vector and / or response frame to indicate delayed access time; determining the third-party station's When the second wireless signal satisfies the spatial orthogonal condition, a channel contention access process is triggered, and subsequent data transmission is completed within the updated time. In the case where the network allocation vector or the response frame indicates that the delayed access time is not 0, when the third-party station determines that the sector transmission in the transmission initiated by the station is orthogonal to its own transmission space, it ignores or resets The network allocation vector or response frame indicates the delayed access time, and the competition is initiated within the updated network allocation vector or response frame to indicate the delayed access time to start spatial orthogonal transmission, which realizes space multiplexing and ensures the inter-site channel Access fairness, thus ensuring the effectiveness of site data transmission.

Description

technical field [0001] The invention relates to a wireless local area network (WLAN) technology, in particular to a channel access method and a station under space multiplexing. Background technique [0002] At present, in the wireless network field, the wireless local area network (WLAN) develops rapidly, and the application demand for the WLAN is increasing day by day. The Institute of Electrical and Electronics Engineers industry standard IEEE802.11 group has defined a series of standards such as 802.11a / b / g / n, and then other task groups have emerged one after another, dedicated to the development of specifications involving the improvement of existing 802.11 technologies. For example, the 802.11ah task group mainly targets the license-free frequency band below the 1GHz frequency band. [0003] In a WLAN, an access point (AP, Access Point) and multiple non-access point stations (STA, non-AP Station) associated with the AP form a basic service set (BSS, Basic Service Set)...

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Problems solved by technology

However, the existing technology does not define access rules for AP2 and STA3, and the transmission between AP2 and STA3 can exceed image 3 The sector beam transmission time period shown in t2 exceeds time t2. In fact, the listening station such as STA4 cannot start competing for the channel at time t2, but waits until the transmission of AP2 and STA3 ends to compete for the channel, and waits for AP2 to , when the transmission of STA3 ends, AP1 and STA1 may also start a new transmission using spatial orthogonality. Undoubtedly, it is very unfavorable and unfair to the channel access of stations such as STA4 or STA5, and also affects the data of such stations. The validity of the transmission

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