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A data transmission protection method and device thereof

A technology of data transmission and channel transmission, applied in the field of communication, can solve the problems of data transmission interference, reducing frequency band utilization, etc.

Active Publication Date: 2020-07-21
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the virtual carrier sense mechanism in the existing 802.11 standard protocol, the station will ignore the received transmission target not including the physical layer convergence procedure protocol (physical layer convergence procedure, PLCP) protocol data unit (PLCP) of the station. )protocol data unit, PPDU) contains a relatively small time domain value duration, while maintaining the current value of its own NAV, at this time, if it receives the When the trigger frame is triggered, it may interfere with the data transmission of the Overlap Basic Service Set (OBSS) due to the response to the trigger frame
On the other hand, the existing technology usually uses a single NAV to control the data transmission on all channel sub-bands of the entire channel transmission bandwidth. When the target station receives a scheduling frame on a certain frequency band, the NAV will The duration updates the current value of NAV. Even if the adjacent station or access point does not occupy the current frequency band, the target station still cannot perform operations in the current frequency band because the current value of NAV does not meet the preset threshold. data transmission, greatly reducing the utilization of the frequency band

Method used

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  • A data transmission protection method and device thereof
  • A data transmission protection method and device thereof
  • A data transmission protection method and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0299] Another data transmission protection method disclosed in the embodiment of the present invention is to set a NAV and a BSS color value on all sub-channel frequency bands of the channel transmission bandwidth.

[0300] In a specific embodiment, the affiliated station sets a NAV on the channel transmission bandwidth and a BSS color corresponding to the source of the cell to which the NAV belongs. Wherein, the NAV is used to record the length of time that the station is prohibited from performing data transmission on all sub-channel frequency bands of the channel transmission bandwidth, and the BSS color is used to record the source of the BSS to which the PPDU that sets the NAV belongs. The BSS color may be derived from the BSS color carried by SIG-A in the PPDU, or from the TA value carried in the MAC header of the PPDU.

[0301] When the station receives the PPDU, determining the source of the PPDU includes the following methods.

[0302] Mode 1: According to whether t...

Embodiment 2

[0314] Another data transmission protection method disclosed in the embodiment of the present invention is to set an intra-NAV and an inter-NAV on all sub-channel frequency bands of the channel transmission bandwidth.

[0315] In a specific embodiment, the affiliated station sets an intra-NAV and an inter-NAV on the channel transmission bandwidth. Wherein, the intra-NAV is used to record the length of time that the station is prohibited from performing data transmission on all sub-channel frequency bands of the channel transmission bandwidth by the BSS, and the inter-NAV is used to record that the station is monitored The time length during which the received OBSS prohibits data transmission on all sub-channel frequency bands of the channel transmission bandwidth.

[0316] When the station receives the PPDU, determining the source of the PPDU includes the following methods.

[0317] Mode 1: According to whether the BSS color in the SIG-A field in the PPDU is equal to the BSS ...

Embodiment 3

[0329] Another data transmission protection method disclosed in the embodiment of the present invention is to set a NAV on all sub-channel frequency bands of the channel transmission bandwidth.

[0330] When the affiliated station receives the PPDU, it judges the TXOP field of the SIG-A field in the PPDU, and if the indicated TXOP field is a specific value, updates the current value of the NAV to a preset value.

[0331] In a specific implementation, if it is judged that the SIG-A field TXOP in the PPDU is all zeros, the current value of the NAV may be updated to 0, so as to clear the current value of the NAV.

[0332] In the embodiment of the present invention, the function of resetting NAV is played by setting the TXOP field to a specific value to flexibly control the duration of channel occupation, and release the channel usage right in time when the station does not need to occupy the channel, so that other stations with NAV The channel can be accessed earlier and the effi...

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Abstract

The embodiment of the present invention discloses a data transmission protection method and its device, wherein the method includes: a station receives a trigger frame sent by an access point of its associated Basic Service Set (BSS); The current values ​​of at least two network allocation vectors NAV are set on the channel frequency band, and an available sub-channel frequency band for data transmission is selected from the channel transmission bandwidth of the BSS in response to the trigger frame. In the embodiment of the present invention, an available sub-channel frequency band for data transmission may be selected according to the current values ​​of at least two NAVs in response to the trigger frame, which is beneficial to reducing data transmission interference and improving frequency band utilization.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 201510897813.X and the title of the invention "a data transmission protection method and its device" filed with the China Patent Office on December 8, 2015, the entire contents of which are incorporated by reference in this application. technical field [0002] The invention relates to the field of communication technology, and in particular to a data transmission protection method and a device thereof. Background technique [0003] The channel access mechanism used by the IEEE802.11MAC in the existing wireless local area network (Wireless local area network, WLAN) system is a carrier sense multiple access / collision avoidance (Carrier Sense Multiple Access with Collision Avoidance, CSMA / CA) mechanism, said The mechanism can be used to detect and avoid conflicts on the network when two or more network devices need to transmit data. Among them, the virtual carrier sense me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/08H04W74/08
CPCH04W74/0816H04W72/542H04W72/02
Inventor 刘应状范巍巍李云波罗俊林英沛彼得·禄
Owner HUAWEI TECH CO LTD