Optimal source tree point to multipoint routing for mobile radio networks

Point to multipoint multicast (MC) packets delivery without optimal distribution trees is prone to unnecessary retransmissions that adversely influences narrow-band VHF networks. The bandwidth efficient MC packet delivery path has to be calculated to best reach all destinations using the inherent broadcast nature of VHF radio subnets by avoiding retransmissions of the same message/packet in the same radio subnet due to parallel gateways or parallel paths to destinations. Optimal source trees for point to multipoint routing in a mixture of broadcast (VHF) radio subnets and unicast radio links (line of sight links) are proposed. These trees avoid unnecessary retransmissions using the broadcast nature of VHF radios.