Video multicast over WLANs: Power saving and reliability perspectives

Reliable video multicast over Wi-Fi networks with coordinated multiple APs

“…For the proposed FEC adaptation algorithm, the initial satisfaction threshold, i.e., p thrsinit , is set to 0.97 for the satisfactory video quality. Based on the proposed FEC rate adaptation algorithm, AP 1, whose coverage overlaps with neighboring APs' coverage, increases its code rate (i.e., decreases N (1) ) so that other APs (AP 2 and AP 3) can transmit more parity packets, i.e., (N (1) , N (2) , N (3) , N (4) , N O ) = (46, 52, 56, 49, 44). Table I also shows the ratio of satisfied users and the average PSNR based on Fig.…”

“…(N (1) , N (2) , N (3) , N (4) , N O ) = (51, 49, 56, 47, 44) by allocating the most parity packets to AP 3 with most associated users. It should be noted that with the partially overlapped scheme with code rate adaptation, we have five satisfied users (i.e., PSNR over 31 dB) while there are only 3 satisfied users without code rate adaptation, thus empirically demonstrating the utility of the code rate adaptation algorithm.…”

Key management paradigm for mobile secure group communications: Issues, solutions, and challenges

“…Wireless devices typically suffer from such primary constraints as bandwidth limitation, low computation power, and low capacity storage [14] [4]. In addition, such devices are able to move from one area of a network to another one, hence member mobility [15][16][17] must be considered as an additional parameter in design of secure group communication.…”

“…According to a recent study, the global mobile data traffic will reach 1.4 Zettabytes per year by 2017 [2], which may provide inspiration and motivation for the development of new group based applications and services such as multimedia conferencing, interactive group games, video on demand, Internet protocol TV (IP-TV), broadcasting stock quotes, and social group networks [3] [4][5][6]. Group based applications provide an efficient communication by delivering a single copy of data to the network elements such as routers and switches, making copy as necessary for the receivers, which result in better utilization of network resources such as bandwidth and buffer space [7] [4].…”

Multicast Algorithms over Wireless Networks Using Network Coding: A Review

“…ii. Opportunistic network coding [14]: In ONC, packets are code at different session and each node uses knowledge of what its neighbors have overheard such that each encoded packet can be decoded immediately at the next stage [15]. Packets combinations are selected according to the received and lost packet state of each link where nodes often opportunistically overhear packets that are not designated to them [16].…”