A method for high multiplexing rate physical layer network coding

Abstract

The invention relates to a high-multiplexing-rate physical layer network coding method. Traditional RTS and CTS handshake frame formats are modified, and a control word is added to improve the multiplexing rate of physical layer network coding PNC. A relay node assigns a queue to each user node to store the cache state of the corresponding node, and looks for a pair of matching modes capable of executing physical layer network coding PNC communication according to the collected user node cache state. By improving the ratio of the number of times of physical layer network coding PNC communication to the total number of times of communication, the problem concerning increase of the multiplexing rate of physical layer network coding PNC is solved, and the throughput of a wireless network is improved. Meanwhile, the traditional method is changed as little as possible in order to make the method compatible with a traditional physical layer network coding PNC communication process.

Description

technical field [0001] The invention relates to a high multiplexing rate physical layer network coding method. Background technique [0002] Physical layer network coding (PNC) takes advantage of what was previously considered interference. Through the physical layer network coding PNC, the bandwidth allocation of each node can be utilized more effectively. Although there are various MAC layer methods that can coordinate PNC, these methods often cannot take full advantage of the benefits brought by PNC. Due to the asymmetry of the communication data flow in the network and other issues, the physical layer network coding PNC can only be implemented in a small part of the communication process, and only non-network coding (NNC) communication can be implemented most of the time. For example, in a slotted ALOHA environment, node n x1 Initiate to node n y1 transmission, while node n y1 Nothing to send to node n x1 , that is, there is no reverse data packet, so the physical ...

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Problems solved by technology

For example, in a slotted ALOHA environment, node n x1 Initiate to node n y1 transmission, while node n y1 Nothing to send to node n x1 data packet, that is, there is no reverse data packet, so this time slot cannot perform physical layer network coding PNC communication, only non-network coding NNC communication

If at this time node n x2 and n y2 There is exactly one pair of reverse data packets waiting to be sent. They can constitute a physical layer network coded PNC communication, but due to channel competition, the right to use the channel cannot be obtained, so it cannot be sent

thus wasting the opportunity of physical layer network coded PNC communication

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