End-To-End HARQ in Cognitive Radio Networks

Abstract—Cognitive radio networks (CRN) may greatly enhance the throughput based on a given bandwidth. CRN has a unique feature, consisting of uni-directional opportunistic wireless links, and packets may be cooperatively relayed from source node to destination node through one or multiple paths, while each path consists of multi-hop opportunistic wireless fading links. Effective end-to-end error control is therefore a must to complete transportation of packets in CRN, though not being touched in open literatures. Traditional ARQ cannot generally function over uni-directional opportunistic links. We consequently develop a novel hybrid ARQ based on amplifyand-forward cooperative relay of CRN to reach the purpose of end-to-end error control at session level. Multiple coded subpackets are sent through multiple paths, and the destination node decodes these received coded sub-packets from different paths. This HARQ for CRN works even missing some coded sub-packets. By the concept of outag...

• Type: Journal
• Year: 2010
• Where: WCNC
• Authors: Weng-Chon Ao, Kwang-Cheng Chen
• Keywords: Computer Networks, Error Control, Multiple Paths, Opportunistic Wireless Fading, WCNC 2010