Medium access control method in use for wireless network in short range

A medium access control, short-range wireless technology, applied in the direction of data exchange network, digital transmission system, electrical components, etc., can solve the problems of reducing node energy efficiency, reducing channel usage efficiency, reducing network throughput, etc., to improve successful transmission probability, increasing normalized throughput, and improving energy efficiency

Inactive Publication Date: 2007-05-30
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it reduces the efficiency of channel usage, thereby reducing the throughput of the network; on the other hand, multiple re-attempts to transmit will consume energy and reduce the energy efficiency of nodes

Method used

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  • Medium access control method in use for wireless network in short range
  • Medium access control method in use for wireless network in short range
  • Medium access control method in use for wireless network in short range

Examples

Experimental program
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Embodiment Construction

[0023] The medium access control method for the short-range wireless network proposed by the present invention has a flow chart as shown in Figure 2. First, the node receives a data transmission request from the upper layer of the network, generates a random number, and uses the random number to update The backoff time flag is initialized; the node detects the channel according to a fixed time period. If the channel is busy, the value of the backoff time flag remains unchanged. If the channel is idle, a unit time is subtracted from the backoff time flag. When the backoff time flag is reduced to At zero time, the node sends data to the destination node through the network medium; the node waits for the confirmation frame of the destination node, if the confirmation frame is received within the set time, the data transmission is completed; if the confirmation frame is not received within the set time, then Regenerate a random number, and use the random number to re-initialize the...

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Abstract

When receiving data transmission request from up layer of network, node generates a random number to initialize tag of retreat time. The node detects channel. If the channel is busy, then the node keeps value of the tag unchanged; otherwise, the tag of retreat time subtracts one time unit. When the value of the tag reaches to zero, the node sends data to the target node, and waits for an acknowledgement frame from the target node. If the said acknowledgement frame is received within setting time, then the data transmission is completed; otherwise, the node regenerates a random number to initialize tag of retreat time. If receiving a data frame, node stops channel detection, and sends an acknowledgement frame to source node of the data frame. Channel detection is recovered. Features are: increasing throughput of network, preventing deadlock, raising usability of energy at node, and simplifying complexity of media access control protocol.

Description

technical field [0001] The invention relates to a medium access control method for a short-range wireless network, belonging to the technical field of wireless communication. Background technique [0002] Wireless communication network systems use electromagnetic waves to transmit data. Due to the openness of the wireless medium, each node in the network shares the wireless channel to transmit data. At this time, the data transmitted by different nodes at the same time may interfere with each other, eventually resulting in transmission failure. In order to avoid this situation, the medium access control protocol in the computer network protocol stack is responsible for controlling the node's access to the wireless channel, that is, specifying when the node can transmit signals to the channel, when it needs to receive information in the channel, etc., to achieve The purpose of avoiding or reducing mutual interference between nodes. [0003] Different types of wireless netw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/413H04L29/06
Inventor 王新杨晨阳杨晖郦亮
Owner BEIHANG UNIV
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