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Method for solving problems of multi-jumping wireless self-network grouping concealed terminal and exposed terminal

A technology of hidden terminals and exposed terminals, applied to electrical components, transmission systems, data exchange through path configuration, etc., can solve the difficulty of hardware implementation that does not completely solve hidden terminals and exposed terminals, busy tone signals, and cannot solve hidden reception Terminal and exposed terminal problems and other issues, to achieve the effect of improving space utilization

Inactive Publication Date: 2008-06-11
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Among the above technologies, (1) the use of the handshake mechanism can solve the problem of hidden sending terminals, but it cannot solve the problems of hidden receiving terminals and exposed terminals; (2) it is an improvement to MACA, adding control frames such as DS, ACK, RRTS, etc. Protocol processing procedures, but cannot completely solve the problem of exposed terminals
(3) It is a multiple access protocol that combines the busy tone signal and the handshake mechanism, which can solve the problem of hidden terminals and exposed terminals, but the increase of the busy tone signal also increases the difficulty of hardware implementation; (4) It combines the carrier sense and handshake mechanism multi-access protocol, but did not completely solve the problem of hidden terminals and exposed terminals
At present, using the handshake mechanism to solve the problem of hidden terminals and exposed terminals is the main tendency, but in the existing protocols, there is no method that can completely solve the problem of hidden terminals and exposed terminals by using the handshake mechanism

Method used

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  • Method for solving problems of multi-jumping wireless self-network grouping concealed terminal and exposed terminal
  • Method for solving problems of multi-jumping wireless self-network grouping concealed terminal and exposed terminal

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Embodiment

[0094] In Figure 4, A is the sending node, B is the receiving node, and C is the hidden terminal. The channel is divided into two sub-channels, a control channel and a data channel. Data packets are transmitted on the data channel, and control packets are transmitted on the control channel. As shown in Figure 3, before sending data, both the sending node A and the receiving node B are in the "idle" state; when A has data to send, it starts the timer and enters the "competition" state; in the "competition" state, A If it times out or there is a "DRI request" (indicating that A has received the DRI packet sent by the neighbor node, and a neighbor node is receiving the data packet), then A cannot send the data packet, and must back off according to the corresponding backoff algorithm and enter the "idle" state , so A will not send the RTS packet; if A does not time out and does not have "DRI request", then continue to proceed;

[0095] Use the RTS-CTS handshake mechanism to star...

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Abstract

The invention provides a method for solving the problems of a hidden terminal and an exposed terminal of a multihop wireless self-organizing network, wherein four states are available for a sending node, that is, an idle state, a competitive state, a wait clear to receive (CTS) state and a data sending state; two states are available for a receiving nod, that is, an idle state and a wait clear to receive (data) state. The method is used to control the shift among the states of the sending node and the receiving node to avoid the occurrence of conflict. The receiving node and the sending node respectively inform by a control packet the hidden terminal and the exposed terminal the starting and ending of the transmission of data, thereby on the basis of not increasing the difficulty in the realization of hardware, completely solving the problems of a hidden terminal and an exposed terminal of a multihop wireless self-organizing network by the design of control packets of RTS / CTS, DRI / DRFIN, DSI / DSFIN, etc., fully ensuring the conflict-free transmission of data and improving the space utilization rate of a signal path.

Description

technical field [0001] The invention belongs to the technical field of wireless communication networks, and in particular relates to a solution to the problem of hidden terminals and exposed terminals in a multi-hop wireless ad hoc network. Background technique [0002] Since the wireless ad hoc network has a dynamically changing network topology, asynchronous communication technology is used, and multiple nodes share the same communication channel. In order to improve the channel utilization, the transmission power of the mobile node is low, and the signal is affected by the noise, channel fading and obstacles in the wireless channel, so that the communication distance of the mobile node is limited. Therefore, the wireless channel of the wireless ad hoc network The sharing method is not one-hop sharing, but multi-hop sharing broadcast channel. The direct impact of the multi-hop shared broadcast channel is that the packet conflict is related to the geographical location of ...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L12/28
Inventor 韦岗刘桂开张军丁泉龙
Owner SOUTH CHINA UNIV OF TECH
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