Safe transmission method based on time delay in cache-assisted multi-relay transmission system
A transmission system and security transmission technology, applied in the field of delay-based security transmission, can solve the problems of increased power consumption and delay, and achieve the effects of ensuring security, improving transmission efficiency, and improving transmission delay performance.
Active Publication Date: 2019-09-27
XI AN JIAOTONG UNIV
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However, after adding relay-assisted transmission, data needs two or more hops to reach the receiving node, so the use of relay-assisted transmission may increase power consumption and delay
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[0056] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0057] refer to figure 1 , the system model diagram of the present invention is specifically described as follows:
[0058] In the cache-assisted multi-relay two-hop communication system, the system model includes a sending node A and N relay nodes R equipped with cache devices j (1≤j≤N), a legal receiving node B and an eavesdropping node E. All nodes are configured with a single antenna. The relay works in half-duplex mode and adopts the decoding and forwarding protocol. The relay is equipped with a buffer so that it can store received data into the buffer. Suppose there is a direct communication link between A and B, but because A and B are far apart, the quality of the communication link is poor. Each transmission takes up one slot and only one data packet is transmitted. In addition, there is an eavesdropping node E near the receiving node B, and the eavesdr...
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The invention discloses a safe transmission method based on time delay in a cache-assisted multi-relay transmission system. LT coding is used, the method comprises two stages, and in the first stage, a sending node broadcasts a coding packet to a relay node and a receiving node. When L relays receive enough coding packets, transmission of the stage can be stopped after LT decoding is completed to obtain all the data packets, so that the transmission delay and the probability of data eavesdropping are reduced. In the second stage, L relays which obtain all the data packets firstly carry out LT coding again, and only the data packets which are not received are coded, so that redundant transmission is reduced. In the stage, each time slot selects one relay as a sending end according to a relay selection method, so that the transmission safety and the transmission efficiency are improved. According to the invention, the actual transmission delay can meet the service requirement by adjusting the relay number of which decoding is completed in the first stage, the data decoding probability of the eavesdropping node can be effectively reduced, and efficient and safe data transmission is realized.
Description
technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a time-delay-based secure transmission method in a cache-aided multi-relay transmission system. Background technique [0002] Cache-assisted relay system is one of the important research directions of 5G ultra-dense heterogeneous network. With the help of temporary buffering of data, the cache-assisted relay system breaks the fixed mode of traditional relay, which is one send and one receive, and breaks through the limitations of this mode on system throughput and transmission efficiency. In cache-assisted relay transmission, the relay does not have to send out the received data immediately in the next time slot, but can temporarily store it in the cache, and then transmit it to the receiving node when the link quality is better, so that The transmission strategy can be adaptively adjusted for the time-varying channel, so as to further improve the transmission p...
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IPC IPC(8): H04W28/14H04W40/12H04W40/22H04L1/00
CPCH04L1/0077H04W28/14H04W40/12H04W40/22
Inventor 杜清河许莹
Owner XI AN JIAOTONG UNIV