3 research outputs found
Encoded packet-Assisted Rescue Approach to Reliable Unicast in Wireless Networks
Recently, network coding technique has emerged as a promising approach that
supports reliable transmission over wireless loss channels. In existing
protocols where users have no interest in considering the encoded packets they
had in coding or decoding operations, this rule is expensive and inefficient.
This paper studies the impact of encoded packets in the reliable unicast
network coding via some theoretical analysis. Using our approach, receivers do
not only store the encoded packets they overheard, but also report these
information to their neighbors, such that users enable to take account of
encoded packets in their coding decisions as well as decoding operations.
Moreover, we propose a redistribution algorithm to maximize the coding
opportunities, which achieves better retransmission efficiency. Finally,
theoretical analysis and simulation results for a wheel network illustrate the
improvement in retransmissions efficiency due to the encoded packets.Comment: 9 pages, 8 figures, submitted to IEEE ICC 201
Buffer Coding for Reliable Transmissions over Wireless Networks β
In-network caching is a useful technique for reducing latency and retransmission overhead of lost packets for reliable data delivery in wireless networks. However, in-network caching is challenging to implement in memory constrained devices such as RFIDs and sensors, and also in Wireless LAN (WLAN) gateways for large-scale deployments. In this paper we propose a novel technique for management of innetwork caches using XOR coding for optimizing the use of limited buffer space in presence of random and burst packet losses. We identify two critical parameters, coding degree and coding distance for the coding scheme. As a case-study we implement our approach over Snoop and evaluate its performance for WLANs. We further propose a self-adaptive algorithm that tunes coding degree on the fly based on the measured coding behavior and packet loss probability. Using simulations in ns-2, we observe that in our simulation settings, when the size of the retransmission buffer in the gateway is less than 16 packets per TCP flow, the throughput can be enhanced by up to 30 % for random losses and up to 20 % for burst losses
XBC: XOR-based Buffer Coding for Reliable Transmissions over Wireless Networks
Abstract β In-network caching is a useful technique for reducing latency and retransmission overhead of lost packets for reliable data delivery in wireless networks. However, in-network caching is challenging to implement in memory constrained devices such as RFIDs and sensors, and also in Wireless LAN (WLAN) gateways for large-scale deployments. In this paper we propose a novel technique for management of in-network caches using XOR coding for optimizing the use of limited buffer space in presence of random and burst packet losses. We identify two critical parameters, coding degree and coding distance for the coding scheme. As a case-study we implement our approach over Snoop and evaluate its performance for a WLAN. Using simulations in ns-2, we observe that when the size of the retransmission buffer on the gateway is less than 16 packets per TCP flow, the throughput can be enhanced by up to 30 % for random losses and up to 20 % for burst losses. I