A Tangent Area Method to Restrict the RREQ Braodcasting Frame

Ad-hoc networks have become a novel area of research and development in mobile computing. In this part, routing protocol is important to improve efficiency of ad-hoc networks. Ad-hoc routing protocols have been studied and developed, such as DSDV, AODV, DSR, and LAR. In this paper, we propose a new routing protocol that is named by advance-LAR based on radio-range of destination node. This protocol is designed to reduce duplicate RREQ messages in the network by restrict the nodes who have a right to propagate the RREQ messages in a fixed area. In order to make sure that the RREQ message should be propagated by some nodes, there should be some nodes can get this right, so that fixed area can be changed in a special way.