Multi-Channel Multiple Access Method Based on Channel Reservation Mechanism in Wireless Ad Hoc Networks

A wireless ad-hoc network and channel reservation technology, applied in the field of communication, can solve problems such as the inability to meet the bandwidth requirements of high-definition video services

Inactive Publication Date: 2011-12-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Jungmin So et al. found that since the DCA protocol uses a common control channel for control packet transmission, when the number of available channels is sufficient, the control channel quickly becomes saturated as the network load increases, which becomes the performance bottleneck of the protocol and still cannot meet the requirements. Bandwidth Requirements for HD Video Services

Method used

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  • Multi-Channel Multiple Access Method Based on Channel Reservation Mechanism in Wireless Ad Hoc Networks
  • Multi-Channel Multiple Access Method Based on Channel Reservation Mechanism in Wireless Ad Hoc Networks
  • Multi-Channel Multiple Access Method Based on Channel Reservation Mechanism in Wireless Ad Hoc Networks

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Embodiment Construction

[0036] The present invention can be implemented in the wireless network card through firmware, or in the driver program of the wireless network card. The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0037] (1) Frame format

[0038] The RTS / CTS frame format adopted by the present invention is slightly different from the standard IEEE802.11 protocol, and a new RES frame is added at the same time.

[0039] (1) RTS frame format

[0040] The RTS frame format that the present invention adopts is as image 3 shown.

[0041] (2) CTS / RES frame format

[0042] The CTS / RES frame format that the present invention adopts is as Figure 4 shown.

[0043]In IEEE802.11, there are 6 bits in "Frame Control" used to identify the frame type. The RES frame is not defined in the standard, but the DATA / ACK frame format adopted by the present invention is consistent with the IEEE802.11b standard.

[0044...

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Abstract

The invention discloses a multi-channel multiple access method based on a channel reservation mechanism in a wireless ad-hoc network. The invention works in a fully distributed network without requiring synchronization of the entire network. In the network using this protocol, the nodes complete the exchange of handshake information on a common channel, and use the reservation mechanism to reserve the sending of a certain number of data packets at the same time as the handshake information is exchanged. The reservation mechanism enables multiple data packets to be sent with only one handshake information exchange, which reduces the load of the public channel and greatly improves the throughput of the network. At the same time, because the time of sending the reserved data packets can be determined, the protocol is particularly suitable for transmission Services that require very high real-time performance, such as video.

Description

technical field [0001] The invention relates to the technical field of communication, and relates to a multiple access method that applies a channel reservation mechanism to multiple channels. Background technique [0002] The IEEE802.11 standard is currently the most widely used WLAN access standard. Its distributed coordination function (DCF: Distribution Coordination Function) is a multiple access technology of a wireless ad hoc network. The technology is a random access strategy based on a carrier sense multiple access with collision avoidance (CSMA / CA: Carrier Sensing Multiple Access / Collision Avoid) mechanism. [0003] The DCF of IEEE802.11 needs to randomly select a backoff time every time it sends a packet to reduce the probability of collision with other nodes. This backoff mechanism greatly reduces the utilization of the channel while reducing the probability of collision. In order to solve this problem, Zhou Ying and Ananda et al. proposed a channel reservation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/06H04W28/26H04W74/08
Inventor 李波陈洪波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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