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Space multiplexing transmission method and device

A technology of spatial multiplexing and transmission opportunities, applied in the field of spatial multiplexing transmission, can solve problems such as unfairness, transmission interference, and unfairness

Inactive Publication Date: 2018-01-30
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this does not solve the problem, because even though the SR ends within the transmission time of the OBSStrigger frame, at this time the NAV is 0 and has not been updated, such as figure 2 As shown, and at this time STA2 uses the energy detection threshold to carry out physical detection of the channel and shows that the channel is idle, then the station STA2 considers the channel to be idle and initiates normal transmission. This will still cause interference to the channel detection of STA1 and cause STA1 to be unable to send UL PPDU
In addition, there is no clear solution to the back-off process in the process of spatial multiplexing. If the traditional back-off process is adopted, then the multiplexing site will have more access opportunities than the traditional site, and there will be problems such as unfairness.
[0007] In related technologies, how to avoid the transmission interference problem caused by not setting NAV during SR transmission and how to avoid the unfair problem caused by the spatial multiplexing backoff process, there is currently no effective solution

Method used

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  • Space multiplexing transmission method and device
  • Space multiplexing transmission method and device

Examples

Experimental program
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Embodiment 1

[0138] This embodiment is used to describe the process of the station judging spatial multiplexing when receiving the OBSS wireless frame, and the process of updating or maintaining the spatial multiplexing timer according to the remaining duration of the OBSS wireless frame.

[0139] Such as Image 6 As shown, AP1 and STA1 are in a basic service set BSS1. STA2 is in another basic service set BSS2. STA2 maintains a spatial multiplexing timer SR Timer. When STA2 determines that the OBSS wireless frame can be multiplexed, it updates or maintains the value of the SR Timer according to the remaining duration of the OBSS wireless frame. SR Timer is a timer whose value decreases with time to zero and can be updated. The value of the SR Timer can be used to indicate whether the station is in the spatial multiplexing state and the duration of the spatial multiplexing state. When the SR Timer is a non-zero value, it indicates that the station is in the spatial multiplexing state, and t...

Embodiment 2

[0142] Based on the first embodiment, when STA2 has data to send, it performs virtual channel detection. If the virtual channel detection result shows that the channel is idle, that is, when there is only one network allocation vector NAV and NAV is 0, or if there are two network allocation vectors, BSS NAV and OBSS NAV, and both NAV are 0, and STA2's When the current value of the SR Timer is zero, STA2 uses the traditional fixed CCA threshold for physical channel detection. When the physical channel detection result also shows that the channel is idle, STA2 starts the traditional transmission backoff process, also called the first backoff process, and uses a fixed CCA threshold for physical layer channel detection. After the channel is idle in a specific interframe interval, such as DIFS, or PIFS, or AIFs, it starts to detect the channel in each back-off time slot. If the back-off time slot is free, the traditional transmission back-off counter will count down once, and contin...

Embodiment 3

[0147] Based on the first and second embodiments, when STA2 has data to send and receives the physical frame header of OBSS radio frame 1 during the traditional transmission back-off process, suspend the traditional transmission back-off process and start a new multiplexed transmission back-off process, use The dynamic CCA threshold performs physical layer channel detection. Before the multiplexing transmission backoff process ends, if the SR Timer of STA2 is reduced to a value of 0, STA2 suspends the multiplexing transmission backoff process, that is, the spatial multiplexing backoff counter no longer counts down. At the same time, STA2 resumes the previously suspended traditional transmission backoff process, and uses the traditional CCA threshold for physical layer channel detection. When the traditional transmission backoff counter backs off to 0, STA2 starts the transmission process of wireless frame 2. STA2 can resume or reset the previously suspended multiplex transmiss...

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Abstract

The invention discloses a space multiplexing transmission method and device. The space multiplexing transmission method comprises that when there is data to be sent in a first site and the local NAV is zero, a corresponding back-off process is executed according to duration of the local space multiplexing state; when the back-off process is finished and the duration of the space multiplexing stateis not zero, the first site starts space multiplexing transmission, and transmission duration of the space multiplexing transmission is smaller than or equal to the duration of the space multiplexingstate.

Description

Technical field [0001] The present invention relates to a wireless local area network (WLAN, Wireless Local Area Network) technology, in particular to a method and device for spatial multiplexing transmission. Background technique [0002] With the explosive application of WLAN networks, on the one hand, the deployment of WLAN networks continues to be intensive, and the network load also continues to increase. On the other hand, with the increase of networks, the overlap of WLAN network coverage has become more serious. The efficiency of the WLAN network will show a significant downward trend, and simply increasing the rate cannot solve this problem. Therefore, the IEEE standards organization established a related task group dedicated to solving the efficiency problem of WLAN networks. Among them, the dynamic channel detection threshold, as an alternative technology to improve the channel reuse rate and solve the network efficiency, has attracted widespread attention and resear...

Claims

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Application Information

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IPC IPC(8): H04W74/08
CPCH04W24/00
Inventor 李瑞梅吕开颖
Owner ZTE CORP
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