A method for resetting a network allocation vector of a wireless local area network

Abstract

The invention provides a method for resetting a network allocation vector of a wireless local area network, which is used for solving the problem of low utilization rate of a channel in the wireless local area network due to incorrect setting of the network allocation vector. The implementation steps are as follows: wireless local area network is constructed, the sender sends an enhanced RTS frame, a station capable of receiving an enhanced RTS frame but unable to receive an enhanced CTS frame sets its own network allocation vector according to a duration field within the enhanced RTS frame, the station then estimates the time TAC at which the recipient sends the enhanced CTS frame, next, the waiting time TR is calculated, and after receiving the enhanced RTS frame TR, the channel marked by the enhanced RTS frame header is evaluated for the idle channel, and then the reset mode of the network allocation vector is selected according to whether the idle time of the main channel is smaller than the distributed inter-frame interval.

Description

technical field [0001] The invention belongs to the technical field of wireless local area networks, and relates to a method for resetting a network allocation vector NAV, in particular to a method for resetting a network allocation vector NAV of a wireless local area network, which can be used for distributed coordination in an enhanced RTS / CTS mode Functional channel access mechanism for WLAN. Background technique [0002] As a communication technology without space limitation, wireless local area network technology has achieved great response in the market as soon as it was proposed, and now it has become an indispensable technology in our daily life. With the large-scale popularization of handheld wireless stations and the continuous emergence of new services, people have higher and higher requirements for the throughput of WLAN. [0003] Throughput refers to the effective amount of data transmitted by a network device within a unit of time. The throughput is mainly det...

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Problems solved by technology

[0009] Therefore, when the sender sends the enhanced RTS frame, he does not know the channel bandwidth for data transmission, so the sender cannot calculate the duration field in the enhanced RTS frame, and the receiver does not know when sending the enhanced CTS frame The size of the data to be sent. Therefore, the duration field in the enhanced CTS frame cannot be calculated. Therefore, the duration field in the enhanced RTS frame and the duration field in the enhanced CTS frame will be set larger than the actual needs

This will cause the channel to remain idle for a long time after the communication is completed, reducing the channel utilization

[0010] Based on the above reasons, in order to solve the problem of low channel utilization caused by the incorrect setting of the network allocation vector NAV in the wireless local area network, researchers have proposed many reset methods of the network allocation vector NAV

Through document retrieval, it was found that in June 2015, the authors S.Byeon, C.Yang, O.Lee, K.Yoon and S.Choi published a paper "Enhancement of Wide Bandwidth Operation in IEEE 802.11ac Networks" discloses a method for setting a network allocation vector in a wireless local area network. The sender sets the enhanced RTS frame duration field to the total bandwidth of the channel marked with the enhanced RTS frame header for data transmission to the receiver. The total time required for the sender to send a data confirmation frame, and the receiver calculates the duration field in the frame according to the total channel bandwidth marked in the head of the enhanced CTS frame and the duration field in the enhanced RTS frame. The duration field in the CTS frame can accurately represent the time from when the receiver sends the enhanced CTS frame to when it sends the data acknowledgment frame, so the station that receives the enhanced CTS frame can correctly set its own network allocation vector NAV, and the channel utilization rate can be obtained A certain degree of improvement, but the disadvantage of this method is that the station that can receive the enhanced RTS frame but cannot receive the enhanced CTS frame cannot correctly set its own network allocation vector NAV, especially when the header of the enhanced RTS frame marks When not all channels are used for data transmission, the idle channel will remain idle during this communication process, resulting in a limited increase in channel utilization

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