Improved request-to-send (RTS)/clear-to-send (CTS)-based method for controlling congestion of multi-hop wireless network

A multi-hop wireless network and congestion control technology, applied in the field of multi-hop wireless network congestion control based on RTS/CTS, can solve the problems of low TCP transmission rate, reduced TCP congestion window, and reduced end-to-end throughput, etc. Small modifications, easy to update effects

Inactive Publication Date: 2010-12-01
SHANGHAI MARITIME UNIVERSITY
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Problems solved by technology

However, in a multi-hop wireless network, due to the mobility of nodes, the problem of hidden terminals and exposed terminals in the link layer, and the high bit error rate of wireless channels, packet loss is caused, and not all packet loss reflected in the trans...

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  • Improved request-to-send (RTS)/clear-to-send (CTS)-based method for controlling congestion of multi-hop wireless network
  • Improved request-to-send (RTS)/clear-to-send (CTS)-based method for controlling congestion of multi-hop wireless network
  • Improved request-to-send (RTS)/clear-to-send (CTS)-based method for controlling congestion of multi-hop wireless network

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention is not limited to the scope described in the embodiments.

[0031] The RTS / CTS handshake mechanism has been widely used to solve the problem of hidden terminals in wireless networks. Such as figure 2 As shown, the RTS / CTS handshake mechanism (the original handshake mechanism) stipulates that: before node A officially sends a data packet to the adjacent node B, it must first send an RTS request frame to node B; after node B receives the RTS, if node A B thinks that there is no hidden terminal around it, and node B returns a CTS reply frame to node A; otherwise, node B does not make any response; only after receiving the CTS reply frame returned by node B, node A can send a data frame (DATA ); and Node B needs to send a reply acknowledgment frame (ACK) to Node A after receiving the data frame from Node A. ...

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Abstract

The invention discloses an improved request-to-send (RTS)/clear-to-send (CTS)-based method for controlling congestion of a multi-hop wireless network. The method comprises the following steps that: adjacent nodes serving as sending parties or receiving parties in the network issue congestion status information per se; when a transmitting node is in a congestion state, a request-to-send with congestion status (RTSC) request frame having the congestion state sends a request to a target node; and if a receiving node of the RTSC frame is also in the congestion state and receives the request, a clear-to-send with congestion status (CTSC) frame is sent, and the receiving node starts to receive a packet from a sending node. A cache in a node is partitioned into a receiving cache and a sending cache, and the cache service condition and the wireless channel competition degree of the node are considered comprehensively to control the congestion; and a congested receiving party and a congested sending party notify the congestion status information to avoid deadlock, so that the congestion status of the node can be acquired correctly by making a small amount of improvement on the conventionalRTS frame and the conventional CTS frame.

Description

technical field [0001] The present invention relates to a wireless network (Wireless Network), an RTS / CTS handshake mechanism in the CSMA / CA protocol (the full name of RTS is Request-To-Send, and the full name of CTS is Clear-To-Send), network congestion control (CongestionControl) and transmission control The technical field of protocol (TCP), specifically relates to an RTS / CTS-based multi-hop wireless network congestion control method. Background technique [0002] Multi-hop wireless networks have a wide range of application scenarios. In such networks, network nodes are both host nodes and forwarding nodes. Such as figure 1 In , since the TCP source node S and destination node D are not within the one-hop transmission range, the data packet must be forwarded by node A and node B to reach the final destination node. As a very important transport layer protocol in the Internet, TCP (Transmission Control Protocol) was originally designed for wired networks with stable topo...

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Application Information

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IPC IPC(8): H04W28/02H04W80/00H04L1/16
Inventor 姜胜明蔡业桂王丽韦岗
Owner SHANGHAI MARITIME UNIVERSITY
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