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Wireless network congestion control method with attached-type cross-layer design

A technology of wireless network and cross-layer design, which is applied in the field of wireless network congestion control with incidental cross-layer design, can solve the problems that congestion control methods cannot be implemented and occupy channel resources, etc. Effects of Deadlock Hazard

Inactive Publication Date: 2013-12-04
SHANGHAI MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In the prior art, the congestion control function is implemented based on the RTS / CTS handshake mechanism, but the RTS / CTS handshake mechanism is not necessarily adopted in the actual network, so in a wireless network that does not use the RTS / CTS handshake mechanism, the above congestion The control method will not be implemented, and the RTS / CTS mechanism will occupy additional channel resources

Method used

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  • Wireless network congestion control method with attached-type cross-layer design
  • Wireless network congestion control method with attached-type cross-layer design
  • Wireless network congestion control method with attached-type cross-layer design

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Embodiment

[0031] The wireless network congestion control method with attached cross-layer design of the present invention is realized through the following steps:

[0032]1. In order to enable the confirmation frame to carry congestion status information, we define an idle control bit in the confirmation frame as the congestion status flag bit. If the congestion status flag bit is set to 0, the confirmation frame is an ACK that does not carry congestion information. frame; if the congestion flag bit is set to 1, the acknowledgment frame is an ACKC frame carrying congestion information. When the receiver of the data frame replies with an ACKC frame to the sender of the data frame, it means that the receiver is in a congested state; when the receiver of the data frame replies with an ACK frame to the sender of the data frame, it means that the receiver is in a non-congested state.

[0033] 2. In order to judge its own congestion status, divide the buffer of each node in the network into r...

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Abstract

The invention discloses a wireless network congestion control method with incidental cross-layer design. This method allows the node to use the ACK confirmation frame of the MAC layer to attach its congestion information, and other nodes evaluate the congestion degree of the sender of the confirmation frame by receiving the confirmation frame, and use this to decide whether to send data. The present invention also proposes the following mechanisms to cooperate with the above method to carry out congestion control: 1. the collaborative congestion control method of the MAC layer and the routing layer to reduce the loss of data frames, 2. the channel competition backoff method that improves the congestion removal speed of the congested node, 3. The method for detecting the actual idle channel misjudged by the virtual carrier sense improves the utilization rate of the channel. The invention can be used to improve the performance of transport layer protocols such as TCP in multi-hop wireless networks.

Description

technical field [0001] The invention relates to the technical field of wireless network and network congestion control, in particular to a method for controlling wireless network congestion with incidental cross-layer design. Background technique [0002] The congestion control algorithm of the traditional TCP protocol judges the congestion situation in the network according to the loss of data packets. When the TCP source node determines that the network is congested, it reduces the transmission rate by reducing the congestion control window, and finally achieves the purpose of unblocking the network congestion. However, in a wireless network, due to factors such as wireless channel noise interference, node movement, and hidden terminals, serious packet loss problems will occur. When TCP is applied to a wireless network, the aforementioned packet loss will cause the source node to misjudge that the network is in a congested state, causing the TCP source node to reduce the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L1/18H04L12/813H04W28/10H04L47/20
Inventor 姜胜明吴泉明
Owner SHANGHAI MARITIME UNIVERSITY
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