1,219 research outputs found
An Extended Network Coding Opportunity Discovery Scheme in Wireless Networks
Network coding is known as a promising approach to improve wireless network
performance. How to discover the coding opportunity in relay nodes is really
important for it. There are more coding chances, there are more times it can
improve network throughput by network coding operation. In this paper, an
extended network coding opportunity discovery scheme (ExCODE) is proposed,
which is realized by appending the current node ID and all its 1-hop neighbors'
IDs to the packet. ExCODE enables the next hop relay node to know which nodes
else have already overheard the packet, so it can discover the potential coding
opportunities as much as possible. ExCODE expands the region of discovering
coding chance to n-hops, and have more opportunities to execute network coding
operation in each relay node. At last, we implement ExCODE over the AODV
protocol, and efficiency of the proposed mechanism is demonstrated with NS2
simulations, compared to the existing coding opportunity discovery scheme.Comment: 15 pages and 7 figure
CROR: Coding-Aware Opportunistic Routing in Multi-Channel Cognitive Radio Networks
Cognitive radio (CR) is a promising technology to improve spectrum
utilization. However, spectrum availability is uncertain which mainly depends
on primary user's (PU's) behaviors. This makes it more difficult for most
existing CR routing protocols to achieve high throughput in multi-channel
cognitive radio networks (CRNs). Inter-session network coding and opportunistic
routing can leverage the broadcast nature of the wireless channel to improve
the performance for CRNs. In this paper we present a coding aware opportunistic
routing protocol for multi-channel CRNs, cognitive radio opportunistic routing
(CROR) protocol, which jointly considers the probability of successful spectrum
utilization, packet loss rate, and coding opportunities. We evaluate and
compare the proposed scheme against three other opportunistic routing protocols
with multichannel. It is shown that the CROR, by integrating opportunistic
routing with network coding, can obtain much better results, with respect to
throughput, the probability of PU-SU packet collision and spectrum utilization
efficiency.Comment: 6 pages, 8 figures, to appear in Proc. of IEEE GlobeCom 201
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