Abstract: Flood relay strategy,which is used in tactical data link(TDL) to realize the broadcast of information,belongs to pure flooding which is supposed to be inefficient.The strategy improves the delivery reliability by redundancy,however,it will lead to superfluous flooding cost.The restricting conditions of the TDL broadcast relay algorithm were analyzed.Then a new relay strategy RA-MPR was proposed to guarantee optimization of relay nodes choice based on the node’s reliability and adjacency while meeting the conditions of restriction on LOS,capacity,delay and equipment.Using the algorithm analysis and simulation of the RA-MPR,the performance of RA-MPR under different network scales and delivering radii was discussed.

Key words: Tactical data link,Flood relay,RA-MPR,Heuristic algorithm