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Method for optimizing hidden terminal based on physical layer interference information

A technology for hiding terminal and interference information, applied in multi-frequency code systems and other directions, can solve the problem of not saving control signal data channel bandwidth, etc., to achieve the effect of increasing channel utilization, avoiding conflicts, reducing conflicts and network delays

Active Publication Date: 2012-07-11
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Abstract
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AI Technical Summary

Problems solved by technology

This method is also based on timing arrangements to avoid hidden terminals, and does not save the data channel bandwidth occupied by control signals

Method used

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  • Method for optimizing hidden terminal based on physical layer interference information
  • Method for optimizing hidden terminal based on physical layer interference information
  • Method for optimizing hidden terminal based on physical layer interference information

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Embodiment Construction

[0033] Such as figure 1 As shown, a hidden terminal refers to a node that is within the coverage of the receiving node but outside the coverage of the sending node. The exposed terminal problem refers to nodes that are within the coverage of the sending node and within the coverage of the receiving node. The sending and monitoring range of each node is one hop away. In the case of hidden terminals: when A sends data to B, since C cannot monitor the data transmission between A and B, it is impossible to know that B is the receiving node at this time. state. Therefore, if C also has data to send to B at this time, it will start sending data immediately. In this way, the data of the sending nodes A and C will collide at the position of the receiving node B, causing B to be unable to receive any information, thus causing waste of resources.

[0034] Such as figure 2 As shown, user D is the sending node, user C is the receiving node, and user E is the victim node. User B is w...

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Abstract

The invention relates to a communication method for solving problems due to a hidden terminal in a wireless network based on a wireless interference cancellation technique and a node full-duplex mode. Under a wireless local area network physical layer, wireless network nodes are coded into special interference signals by an OFDM (Orthogonal Frequency Division Multiplexing) technology, and overlapped into data signals in the air by means of ''attachment''. The control information and the data information can be transmitted in parallel, thus, the resource consumption on control information can be saved. The nodes for receiving the data information can remove the interference signals by an interference canceling technology in order to obtain the original data. The node for receiving the control information can demodulate the control signal from the mixed signal by an energy detecting technology, so as to obtain the physical address of the node which is transmitting in a collision domain, as well as establishing a relative node list. By inquiring the transmitting state and the receiving state of adjacent nodes, the node can determine whether it is the hidden terminal, so as to avoid transmission of conflict data and increase channel utilization rate.

Description

technical field [0001] The invention relates to a communication method for solving the hidden terminal problem in a wireless network based on a wireless interference cancellation technology and a network node full-duplex mode. The method can effectively avoid the transmission interference caused by the hidden terminal in the wireless network, thereby improving the channel utilization rate and increasing the total throughput of the network. The invention belongs to the technical field of wireless communication. Background technique [0002] Hidden terminals are a classic problem in wireless networks. Hidden terminals are nodes that are within the coverage of the receiving node but outside the coverage of the sending node. Hidden terminals may send data to the same receiving node because they cannot hear the sending node's transmission, causing the data to collide at the receiving node. Since the sending node has to retransmit the conflicted data after the collision, this r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 王璐伍楷舜倪明选
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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