Distributed relay erasure coding method for mobile delay tolerant network

Abstract

The invention provides a distributed relay erasure coding method for a mobile delay tolerant network based on Y-type topology adopting two information sources, a single relay and a single destination node. An IRD-DLT relay decoding and transmitting scheme adopting two information sources and a single relay is that two source nodes are coded by using WRSD distribution, and the relay combines transmitting and random network coding and effectively adapts to the characteristic that links of the mobile delay tolerant network are easily interrupted. A DRD-DLT scheme is designed by utilizing cache information of the relay based on the IRD-DLT relay decoding and transmitting scheme, and source coding redundancy required by the IRD-DLT is reduced by about 50%. Finally, an SSGE decoding algorithm is introduced for reducing decoding redundancy required by the destination node, compromise of the decoding complexity and decoding performance is achieved, and the decoding redundancy of the destination node is reduced by about 50%.

Description

technical field [0001] The invention relates to a distributed relay erasure coding method oriented to a mobile delay-tolerant network. Background technique [0002] Mobile Delay / Disruption Tolerant Networks (MDTN), which have emerged in recent years, transmit information through entrusted transmission between nodes. In particular, the bundle layer (Bundle) middleware inserted between the application layer and the network layer supports network heterogeneous interconnection and various hierarchical services that match business needs. MDTN is suitable for certain wireless communication fields with harsh natural conditions, lack of complete communication facilities, large time scale, and long distances (such as Internet of Vehicles, disaster rescue, wild animal tracking, and deep space exploration communications, etc.). [0003] The efficient and reliable data transmission of MDTN often needs to face some or all of the following characteristics and difficulties: ①The network t...

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Problems solved by technology

[0003] The efficient and reliable data transmission of MDTN often needs to face some or all of the following characteristics and difficulties: ①The network topology is highly dynamic, the channel is complex and time-varying, and the link lifetime is short and easy to be interrupted randomly; ②Node resources are unbalanced, and nodes Communication resources such as cache and computing power are not equal; ③The channel transmission capacity is limited, and the high-speed movement and occlusion of nodes cause the wireless channel to be seriously affected by multipath fading, shadow effect and Doppler frequency shift, resulting in packet loss in data transmission ④In some communication scenarios, the mobile part of the node is predictable (such as the Internet of Vehicles highway communication, deep space exploration communication, etc.); network segmentation

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