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MAC (Media Access Control) layer reliable multicasting method of wireless ad hoc network

A wireless self-organization and network technology, which is applied in wireless communication, broadcast service distribution, error prevention/detection using return channels, etc., can solve the problems of imperfect retransmission mechanism, high transmission efficiency, low transmission efficiency, etc., and achieve improvement Effects of channel utilization, avoiding hidden terminals, and reducing control overhead

Inactive Publication Date: 2013-10-30
ZHEJIANG GONGSHANG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The present invention provides a reliable MAC layer multicast method for wireless ad hoc networks, which solves the problems of hidden nodes and low transmission efficiency caused by imperfect retransmission mechanisms in existing wireless ad hoc network multicast MAC layer protocols. , high transmission efficiency, large throughput

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  • MAC (Media Access Control) layer reliable multicasting method of wireless ad hoc network
  • MAC (Media Access Control) layer reliable multicasting method of wireless ad hoc network
  • MAC (Media Access Control) layer reliable multicasting method of wireless ad hoc network

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Embodiment Construction

[0041] In order to describe the present invention in more detail, the MAC layer protocol method of the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0042] Such as figure 1 As shown, a MAC layer reliable multicast method for a wireless ad hoc network includes the following steps:

[0043] (1) The sender receives multicast packets from the network layer;

[0044] (2) Use the CSMA / CA protocol to avoid conflicts between nodes, until the channel is idle and idle DIFS, the sender starts a backoff timer to count down, and the countdown reaches 0, the sender constructs an RRTS frame and sends an RRTS frame to each receiver;

[0045] In addition to all the fields in the IEEE 802.11 protocol RTS frame, the RRTS frame has also expanded the receiver address field to store more receiver MAC addresses;

[0046] (3) The receiving end receives the RRTS frame, and obtains its own NHID according to the position of its MAC address in the RR...

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Abstract

The invention discloses an MAC (Media Access Control) layer reliable multicasting method of a wireless ad hoc network, comprising the following steps: (1) a transmitting end receives a multicasting pocket; (2) the transmitting end transmits an RRTS (Reliable RTS (Request To Send)) frame to a receiving end; (3) the receiving end replies an RCTS (Reliable CTS (Clear To Send)) frame to the transmitting end; (4) the transmitting end constructs an RDATA (Reliable DATA) frame and transmits the RDATA frame to the receiving end; (5) the receiving end receives the RDATA frame and replies an RACK (Reliable Acknowledgement) frame to the transmitting end; (6) the transmitting end judges whether to retransmit the RDATA frame to the receiving end according to the RACK frame; and (7) the transmitting and receiving process is cycled until all data are completely transmitted. By adopting the MAC reliable multicasting method disclosed by the invention, only one frame carrying a replying request is set for a plurality of RDATA frames, therefore, the channel utilization ratio is improved, a great quantity of control expenses brought by frequency reply is avoided, and the conflict phenomenon during replying is avoided by setting different replying time by utilizing an NHID (Next-Hop ID); and thus the invention has high transmission efficiency and large throughout and can be widely applied to a multicasting technology of the wireless ad hot network.

Description

Technical field [0001] The invention belongs to the technical field of wireless communication, and specifically relates to a method for reliable multicast at the MAC layer of a wireless ad hoc network. Background technique [0002] The wireless ad hoc network does not require fixed basic network facilities or the management of a central system. The network is automatically formed by wireless mobile nodes. It can be flexibly used in battlefields, disaster areas, field investigations and other occasions where it is difficult to set up network facilities in advance. The application of wireless ad hoc networks Mainly reflected in the military, home wireless ad hoc networks, mobile conferences, emergency services, sensor networks, cellular mobile communication systems, multi-hop enhancements (that is, the use of mobile terminals' multi-hop transmission capabilities to expand the coverage of cellular mobile communication systems) and other fields . At present, academia and industry al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/16H04W4/06H04W74/08
Inventor 余燕平郑元琰黄怡倪玲玲徐小艳马志宽
Owner ZHEJIANG GONGSHANG UNIVERSITY
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