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Transmitting multimedia streams over IEEE 802.11 Wireless Local Area Networks (WLANs) with high performance and reliability is a challenging task. In the current paper, we study the basic problems that video transmission encounters in wireless LANs and we present some of the proposed solutions. In particular, we will outline the solutions that were selected for the 802.11aa amendment to the IEEE 802...
This paper presents an architecture for live streaming of scalable video, which is encoded using the H.264 SVC (Scalable Video Coding) standard and transmitted over multicast groups on a peer-to-peer (P2P) network. The architecture has two characteristics: 1) the utilization of a paradigm of video compression based on independent compressed blocks in order to minimize some of the practical difficulties...
In this paper, some novel results on the encoding complexity of network coding and its relation with the network topology are reported. The encoding complexity in network coding is defined as the number of nodes which have to perform coding operations in order to achieve the multicast capacity. These nodes are referred to as coding points. Known results state that the number of coding points is cubic...
Initially deployed for TV broadcasting, geostationary satellite networks and DVB standards have become mature technologies for IP communications. Also used to interconnect wide IP networks, dynamic IP routing is required in geostationary mesh satellite networks. Nevertheless, terrestrial IP routing protocols are not optimized for satellite networks. Especially, as far as BGP operates over TCP at transport...
Long Term Evolution (LTE) is the emerging 4G wireless technology developed to provide high quality services in mobile environments. It is foreseen that multimedia services and mobile TV will assume an important role for the LTE proliferation in mobile market. However, several issues are still open and meaningful improvements have to be introduced for managing physical resources when group-oriented...
This paper proposes a network coding based retransmission scheme for multicast in a mobile communication network with relay. The proposed retransmission scheme uses frequency division (FD) for resource allocation in order to achieve high transmission and retransmission efficiency in the network. Meanwhile, an efficient packet selection algorithm called Weight Pick is proposed to support the retransmission...
In conventional multicast scheme (CMS), the total throughput of multicast group is constrained by the user with the worst channel quality. In order to overcome this problem of limited throughput, we consider an opportunistic multicast scheduling (OMS) based on layered coding. A novel subcarrier and bit allocation algorithm is exploited for targeting the maximum throughput (MT) of a whole multicast...
This paper propose an optimal resource allocation algorithm by exploiting opportunistic multicast scheduling (OMS) scheme using layered coding combined with erasure correction coding for multicast services in the downlink of OFDMA-based single frequency networks (SFN). In this algorithm, we exploit unequal error protection (UEP) Reed-Solomon (RS) coding to compensate for possible data packet loss...
Mobile TV and Video on Demand (VoD) streaming services represents an important service which will be provided by Fourth Generation (4G) cellular networks. Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) is one of the most successful 4G technologies used by most of the 4G operators for delivering mobile broadband. In the past, cellular systems have mostly focused on unicast transmission...
With the deployment of Audio-Video (AV) services and the flexibility offered by wireless networks, there is more and more an increasing interest on defining more reliable multicast mechanisms. Towards this end, the IEEE Task Group aa (TGaa) is currently working on the definition of the IEEE802.11aa amendment. The standardization efforts in this area aim to develop efficient QoS mechanisms by keeping...
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