Proactive Adhoc Nodes for Real-Time Video

Van, Tien Pham

doi:10.1109/iccs.2006.301456

Cited by 5 publications

(9 citation statements)

References 6 publications

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“…Details of how packets can be cached inside routers including a new protocol layer above the network layer can be found in [13], [14]. Peer assisted retransmission in an IPTV network was explored in [15].…”

Section: A Related Workmentioning

confidence: 99%

“…Caching video packets at intermediary routers has formerly been proposed in the literature to reduce retransmission delay to make retransmission requests feasible for real time video [11], [12], [13], [14], [15]. When packets containing video are lost in the network, retransmission requests can be serviced by intermediary caching routers rather than the source node, thereby reducing the retransmission delay and retransmission distance (and therefore energy consumption).…”

Section: Introductionmentioning

confidence: 98%

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Minimizing Video Retransmission Delay and Energy Consumption with Caching Routers

McGarry

Hernández

Ferzli

et al. 2012

2012 IEEE International Conference on Multimedia and Expo Workshops

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We investigated the use of caching of packets containing video at intermediary routers to reduce the delay and energy consumption of Automatic Repeat reQuest (ARQ) error recovery. We modeled the two mathematical programs that select the optimal set of routers to have caching ability, one to minimize energy consumption and the other to minimize retransmission delay. Both of these mathematical programs have identical structure. We then solve these mathematical programs with a dynamic programming solution whose execution time growth is polynomial in the size of the input parameters. Our performance analysis indicates that the optimal solution significantly outperforms several heuristic solutions.

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Section: A Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Minimizing Video Retransmission Delay and Energy Consumption with Caching Routers

McGarry

Hernández

Ferzli

et al. 2012

2012 IEEE International Conference on Multimedia and Expo Workshops

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“…is the optimal value of (10) and (11). Furthermore, the optimal choice of i 1 , ··· , i N can be obtained using the following backward recursion, with i N+1 = M:…”

Section: F Dynamic Programming Solutionmentioning

confidence: 99%

“…In [11] and [12] the author provides details of how packets can be cached inside routers including the definition of a new protocol layer in the caching routers, above the network layer, called Real-Time Media Engine (RTME). Additionally, the author presents a model for the reduction in retransmission delay and improvements to energy efficiency facilitated by adding caching routers.…”

Section: A Related Workmentioning

confidence: 99%

Optimal Caching Router Placement for Reduction in Retransmission Delay

McGarry

Shakya

Ohannessian

et al. 2011

2011 Proceedings of 20th International Conference on Computer Communications and Networks (ICCCN)

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We analyze the use of caching of video frames at network routers for reducing average retransmission delay. We formulate an expression for the average retransmission delay using video caching routers. In turn, we use this expression to formulate a mathematical program to minimize the average retransmission delay. We find a dynamic programming solution to the resultant non-linear convex binary integer program. We compare the results obtained from the dynamic programming solution with those obtained via experimental exhaustive enumeration. The experimental results validate our models and dynamic programming solution. Finally, we use numerical analysis to quantify the retransmission delay difference between the best and worst caching router placements. Our findings show that the optimal placement of caching routers can significantly reduce cost by minimizing the number of caching routers required to meet a desired retransmission delay performance. Furthermore, our dynamic programming solution shows that such optimal placement can be efficiently determined from network parameters, without an exhaustive search.

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“…Obviously, the fewer hops packets traverse the higher the successful rate [5] and the throughput [1], since ad hoc wireless links are inherently erroneous. As presented in [5], shortening the length of the path for a particular packet does not only increase the possibility of success per retransmission attempt, but also enable more retransmission times before the packet gets stale.…”

Section: Video-cooperative Relayingmentioning

confidence: 99%

Efficient Relaying of Video Packets over Wireless Ad hoc Devices

Pham

2006

2006 IEEE Annual Wireless and Microwave Technology Conference

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Wireless channels in ad hoc networks are essentially erroneous, unstable, and restricted in capacity, which does challenge video communication.In this paper, we introduce a novel design for ad hoc devices that relay real-time video packets. Transiently "caching" packets allows an intermediate node to respond to ARQ requests, which obviously enhances the reliability of retransmission and reduces cumulative power consumption. Additionally, each node smartly selects packets to forward once the channel cannot accommodate all of them. We also propose a jointly discarding mechanism in which stale packets and their dependent ones can be detected and destroyed to save energy and bandwidth. The framework has been realized over a real-life testbed, clearly showing its soundness.

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Proactive Adhoc Nodes for Real-Time Video

Cited by 5 publications

References 6 publications

Minimizing Video Retransmission Delay and Energy Consumption with Caching Routers

Minimizing Video Retransmission Delay and Energy Consumption with Caching Routers

Optimal Caching Router Placement for Reduction in Retransmission Delay

Efficient Relaying of Video Packets over Wireless Ad hoc Devices

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