关键词: 网络编码组播, 有限域, 运算延迟, 分级网络编码

Abstract: In order to reduce the size of finite fields GF(2n) which was needed for the encoding calculation in intermediate node of network, a data transmission method based on hierarchical network coding was proposed in this paper. Focusing on the single-source multicast network with backbone-sub network structure, the authors decoded at the node that connected the backbone network and the sub-network. Then the decoded information was multicast to sub-network by network coding data transmission method. The theoretical analysis and the simulation results show that this method can reduce the size of finite fields GF(2n), and then reduce the computation delay of data transmission. Besides, it can make full use of the network capacity.

Key words: network coding multicast, finite field, computation delay, hierarchical network coding