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Exposed terminal optimizing method on basis of physical layer interference information

A technology that exposes terminals and interferes with information. It is applied in wireless communication, using return channels for error prevention/detection, and electrical components. It can solve problems such as channel bandwidth occupation, reduce network delays, and increase total throughput.

Active Publication Date: 2012-07-25
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still relies on RTS packets in the time domain to judge exposed terminals, which not only occupies channel bandwidth, but also causes other problems

Method used

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  • Exposed terminal optimizing method on basis of physical layer interference information
  • Exposed terminal optimizing method on basis of physical layer interference information
  • Exposed terminal optimizing method on basis of physical layer interference information

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Experimental program
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Embodiment Construction

[0031] See figure 1 , When the node has data to send, it first monitors the DIFS time on the channel and detects the A-RTS transmitted in the channel. According to the detected A-RTS result, the node can build a list of currently transmitting nodes to obtain the current transmitting node information. According to the two-hop neighbor table obtained from the network layer, the node can judge whether the data transmission is successful. If there is no receiving node in the one-hop neighbor at this time, and the receiving end of the node is not affected by other transmissions, then the node Data transmission is possible. Otherwise, the node will postpone the current transmission and re-monitor and compete for the channel.

[0032] Such as figure 1 As shown, when the transmission is completed, the node switches to the monitoring state, waiting for ACK and collecting other A-RTS in the conflict domain. If the node receives the ACK within the SIFS time, it indicates that the transmis...

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PUM

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Abstract

The invention relates to a communication method, which is based on interference elimination technology and used for solving the problems of exposed terminals in the wireless network. An exposed terminal optimizing method is based on the OFDM (orthogonal frequency division multiplexing) modulation technology, encodes wireless network node information into interference signals by communication interference technology from the physical layer of the wireless local area network. Interference signals carrying node information, namely control information, are overlapped into original data signals in an 'accessory' manner and are transmitted with data information synchronously. By the transmission mode, resource consumption of the control information can be saved greatly, raw data receiving nodes acquire raw data by eliminating interference signals by the interference offset technology, and control information receiving nodes demodulate the control information from the interference signals by energy detection so as to acquire transmitting node lists. Whether the nodes are exposed terminals or not can be judged by the nodes according to a neighbor table acquired from a routing layer, the total throughput of the network can be increased by increasing parallel connections in a collision domain, and space multiplexing rate is increased.

Description

Technical field [0001] The invention relates to a method for optimizing exposed terminals based on physical layer interference information. Use interference cancellation technology to solve the problem of exposed terminals in wireless networks. This method can effectively use exposed terminals in the wireless network for data transmission, thereby increasing the total network throughput. The invention belongs to the field of wireless communication technology. Background technique [0002] Exposing the terminal is a classic problem in wireless networks. It refers to nodes that are within the coverage of the sending node but outside the coverage of the receiving node, and the exposed terminal may delay transmission due to monitoring the transmission of the sending node. It is actually outside the communication range of the receiving node, and its transmission will not cause conflict. Therefore, exposing terminal problems will reduce network throughput and introduce unnecessary d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04L1/18H04L1/16
Inventor 王璐伍楷舜韩隶倪明选
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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