Method and device and system for starting RTS/CTS mechanism

A mechanism and relational technology, applied in the field of request to send/permission to send mechanism, can solve the problems of not taking into account whether there are hidden nodes, the probability of hidden nodes appearing, the probability of repeatedly sending data, etc., so as to improve the utilization of air interface efficiency, improve user experience, and reduce interference

Active Publication Date: 2013-08-14
ZTE CORP
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  • Claims
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Problems solved by technology

Obviously, the principle of this mechanism is based on the fact that shorter data is less likely to be affected by hidden nodes than long data. The problem with this mechanism is that it does not take into account whether there are hidden nodes in the actual situation; The additional RTS/CTS mechanism provided by long data is meaningless, and the protection mechanism for short data is insufficient i

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  • Method and device and system for starting RTS/CTS mechanism
  • Method and device and system for starting RTS/CTS mechanism
  • Method and device and system for starting RTS/CTS mechanism

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Embodiment 1

[0068] figure 2 and image 3 Schematic diagrams of hidden and non-hidden nodes, respectively.

[0069] exist figure 2STA_1 is associated with AP_1, STA_2 is associated with AP_2, STA_2 is within the coverage areas of AP_1 and AP_2, and AP_1 and AP_2 are not within the coverage area of ​​each other, AP_1 cannot listen to the signal sent by AP_2, and neither can AP_2 For the signal sent by AP_1, the CSMA / CA mechanism cannot be used between AP_1 and AP_2 to avoid sending data at the same time.

[0070] for figure 2 In the scenario shown, if AP_2 sends data to STA_2 while AP_1 sends data to STA_1, STA_2 cannot receive the data sent by AP_2 due to the collision of the data sent by AP_1 and AP_2 at the same time at STA_2. constitute hidden nodes. According to the IEEE 802.11 protocol, when STA_2 cannot receive the data sent by AP_2 normally, it cannot reply ACK message to AP_2 for confirmation, and AP_2 will resend the data to STA_2 if it does not receive the ACK message aft...

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Abstract

The invention discloses a method for starting an RTS/CTS mechanism, which comprises the following steps: an AC (AP (Access Point) Controller) receives transmitting terminal information reported by APs in the self district; the AC detects whether hidden nodes exist between APs or not according to the transmitting terminal information reported by the APs; the AC determines STAs (Station) influenced by the hidden nodes according to the transmitting terminal information reported by APs between which the hidden nodes exist, so as to generate controlled information and issue the controlled information to the APs related with the STA; and the APs receive the controlled information, and start the RTS/CTS mechanism when sending data to the STAs according to the controlled information. Accordingly, the invention further discloses a device and system for starting the RTS/CTS mechanism. The method, the device and the system reduce the interference caused by the hidden nodes existing between the APs in the system, the RTS/CTS mechanism is not abused, and the air interface utilization rate and the system access capability are improved.

Description

technical field [0001] The present invention relates to wireless access technology, in particular to a request to send / clear to send (RTS / CTS, Request To Send / Clear To Send) mechanism activation method, device and system. Background technique [0002] Wireless local area network technology is a widely used wireless access technology at present, which uses wireless signals to transmit user information. [0003] The WLAN complies with the IEEE 802.11 series protocols and operates according to the Carrier Sense Collision Avoidance (CSMA / CA) mechanism. The CSMA / CA mechanism supports a simple distributed, contention-based access protocol. In this mechanism, the communication entities are in an equal position, and the communication entities in the common coverage area share the channel. Any communication entity sends data before sending data. Carrier sensing is required, and data can only be sent after waiting for a certain period according to the protocol after the channel is de...

Claims

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Application Information

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IPC IPC(8): H04L29/12H04W74/08
Inventor 肖志方赵家伟王民
Owner ZTE CORP
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