Title :
On the impact of the video quality assessment in 802.11e ad-hoc networks using adaptive retransmissions
Author :
Corrado, Rosita ; Comisso, M. ; Babich, F.
Author_Institution :
Dept. of Eng. & Archit., Univ. of Trieste, Trieste, Italy
Abstract :
This paper investigates the influence of the video quality assessment at the medium access control (MAC) layer of an 802.11e distributed network in which the purpose is to adapt the retry limit of each video packet for maximizing the quality perceived by the end user. Moving from an existing Markov model of the 802.11e access scheme, the number of retransmissions associated to each video packet is evaluated to satisfy the distortion requirements inferred using two quality assessment measures: the mean squared error (MSE) and the structural similarity (SSIM) index. The aim of the proposed work is to discuss the suitability of these measures for managing the retransmission policy in the presence of contention-based mechanisms. The numerical results are obtained using a network simulator implementing the 802.11e enhanced distributed channel access (EDCA) in which the video sequences are encoded using the H.264 scalable video coding (SVC) standard.
Keywords :
Markov processes; access protocols; ad hoc networks; mean square error methods; video coding; video communication; wireless LAN; 802.11e access scheme; 802.11e ad hoc networks; 802.11e distributed network; 802.11e enhanced distributed channel access; EDCA; H.264 scalable video coding standard; MAC layer; MSE; Markov model; SSIM index; SVC standard; adaptive retransmissions; contention-based mechanisms; distortion requirements; end user; mean squared error; medium access control layer; network simulator; quality assessment measures; retransmission policy; structural similarity index; video packet; video quality assessment; Estimation; IEEE 802.11e Standard; Indexes; Quality assessment; Streaming media; Video recording; Video sequences; 802.11e network; Wireless video streaming; retry limit adaptation; video quality assessment;
Conference_Titel :
Ad Hoc Networking Workshop (MED-HOC-NET), 2014 13th Annual Mediterranean
Conference_Location :
Piran
DOI :
10.1109/MedHocNet.2014.6849104
