Title :
System Design and Testbed Implementation of Adaptive Coding Optimization in Lossy Networks
Author :
Yi Shi ; Sagduyu, Yalin E. ; Junshan Zhang ; Li, J.H.
Author_Institution :
Intell. Autom. Inc., Rockville, MD, USA
Abstract :
A fundamental challenge in wireless networks is handling packet loss due to dynamic noise, interference, and dynamic channel effects, especially when there is no per-packet acknowledgement due to additional delays and potential loss of feedback packets. We design and implement a packet coding optimization scheme applied at source node to enhance end-to end transmission reliability in a lossy multi-hop network. Each source node transmits a file of packets to its destination node in the network where the end-to-end packet acknowledgement is not readily available because of the possible error or delay effects over multiple hops. By simply retransmitting packets, a source node cannot guarantee innovative packet arrivals at the destination node. Thus, we design an optimization scheme for adaptive packet coding applied at the source node to avoid redundant packet traffic thereby significantly improving the throughput, even for the case of a single unicast session. This scheme does not require any knowledge of network topology and can seamlessly operate with any routing or network coding protocol used at the intermediate relay nodes. First, we discuss the throughput properties of coded transmissions and verify the feasibility of performance gains via simulations. Then, we provide high fidelity emulation test bed results with real radio transmissions over emulated channels to evaluate the throughput gains. Without relying on end-to-end acknowledgment for each packet, we show that the adaptive packet coding optimization scheme can achieve significantly higher throughput than the retransmission scheme in lossy networks with unicast traffic.
Keywords :
adaptive codes; interference (signal); optimisation; radio networks; telecommunication network reliability; telecommunication traffic; adaptive packet coding optimization scheme; coded transmission; destination node; dynamic channel effect; dynamic noise; emulated channel; end-to-end acknowledgment; end-to-end transmission reliability enhancement; feedback packet delay; high fidelity emulation testbed implementation; innovative packet arrival; intermediate relay node; lossy multihop network; network coding protocol; network interference; network topology; packet loss handling; packet retransmission; packet traffic avoidance; per-packet acknowledgement; routing protocol; single unicast session; source node; system design; throughput improvement; unicast traffic; wireless network; Delays; Emulation; Encoding; Optimization; Packet loss; Throughput; Network coding; lossy networks; multi-hop networks; network emulation; retransmission; testbed; throughput;
Conference_Titel :
Military Communications Conference (MILCOM), 2014 IEEE
Conference_Location :
Baltimore, MD
DOI :
10.1109/MILCOM.2014.166