Extended Intra-Route Collision Avoidance Method with Variable Transmission Power Based on SIR Collision Model

In wireless multihop networks, a sequence of data messages are transmitted along a predetermined wireless multihop transmission route. Collisions among wireless transmission signals from the intermediate wireless nodes cause reduction of the end-to-end data message throughput. Hence, avoidance and/or reduction of collisions between 2-hop neighbor intermediate nodes due to the hidden terminal problem is required. For the disk model wireless transmissions in which each intermediate wireless node determines its wireless signal transmission range, RH2SWL is one of efficient the solutions. Here, a wireless multihop transmission route consists of a sequence of wireless communication links whose length becomes shorter in hop-byhop manner. However, in a wide-area wireless multihop network where a wireless multihop transmission route tends to be longer, the route detection ratio tends to be lower since it becomes difficult for each intermediate wireless node to detect its nexthop node with its shorter wireless signal transmission range to configure a sequence of hop-by-hop shorter wireless communication links. In order to solve this problem, this paper proposes a novel routing method for a wide-area wireless multihop networks based on the SIR model. The proposed routing method configures a wireless multihop transmission route where each intermediate wireless node receives wireless signal from its previous-hop intermediate wireless node without collisions with that from its next-hop wireless node. The proposed routing method is expected to improve the route detection ratio.