Nodes and NAV (network allocation vector) control method, device and system therefor

Abstract

The invention discloses nodes and NAV (network allocation vector) control method, device and system therefor. The method includes: judging that a preset first field of a monitored MAC (media access control) frame carries a first identifier, upgrading a local NAV value into a preset first value smaller than the local current NAV value; and after a TXOP (transmit opportunity) responder receives a last MAC frame transmitted by a TXOP holder, transmitting the MAC frame with the preset first field carrying the first identifier. The method, device, system and nodes allow hidden sites to timely compete for channel access, so that the problem of regional discrimination is solved for the sites.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, a device, a system and a node for NAV control on a node. Background technique [0002] The basic component of a wireless local area network (WLAN, Wireless local area network) based on IEEE 802.11 technology is a basic service set (BSS, Basic service set), which consists of a certain coverage area and has some associated stations (STA , Station) composition, such as figure 1 The second basic service set BSS2 and the third basic service set BSS3 are shown. In the BSS network, the central station with full-time management of the BSS is called an access point (AP, Access point), and other stations STA in the network are associated with it. Multiple BSS networks can be connected to each other through a distributed system (DS, Distribution system) to form an extended service set (ESS, Extended service set). In addition, in the absence of an AP, the STAs at the stations c...

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Problems solved by technology

[0007] However, the inventor found that the CF_End frame sent by the TXOP holder can only update the NAV value of the station covered by the TXOP holder to 0, and the hidden station cannot receive the CF_End frame because it is not covered by the TXOP holder, so its NAV value It will remain unchanged, and can only wait until the local NAV value decreases to 0 before entering the channel access competition state. The time to enter the channel access competition state is obviously later than that of nodes under the coverage of TXOPholder

Therefore, the hidden station cannot enter the channel access competition state in time according to the early termination of the TXOP, so there is a problem of regional discrimination of the station

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