Current Issue : January - March Volume : 2013 Issue Number : 1 Articles : 5 Articles
The emerging multimedia Internet application IPTV over P2P network preserves significant advantages in scalability. IPTV media\r\ncontent delivered in P2P networks over public Internet still preserves the issues of privacy and intellectual property rights. In\r\nthis paper, we use SIP protocol to construct a secure application-layer multicast overlay network for IPTV, called SIPTVMON.\r\nSIPTVMON can secure all the IPTV media delivery paths against eavesdroppers via elliptic-curve Diffie-Hellman (ECDH) key\r\nexchange on SIP signaling and AES encryption. Its load-balancing overlay tree is also optimized from peer heterogeneity and\r\nchurn of peer joining and leaving to minimize both service degradation and latency. The performance results from large-scale\r\nsimulations and experiments on different optimization criteria demonstrate SIPTVMON�s cost effectiveness in quality of privacy\r\nprotection, stability fromuser churn, and good perceptual quality of objective PSNR values for scalable IPTV services over Internet....
Broadcasting Protocols can efficiently transmit videos that simultaneously shared by clients with partitioning the videos into\r\nsegments. Many studies focus on decreasing clients� waiting time, such as the fixed-delay pagoda broadcasting (FDPB) and the\r\nharmonic broadcasting schemes. However, limited-capability client devices such as PDAs and set-top boxes (STBs) suffer from\r\nstoring a significant fraction of each video while it is being watched. How to reduce clients� buffer demands is thus an important\r\nissue. Related works include the staircase broadcasting (SB), the reverse fast broadcasting (RFB), and the hybrid broadcasting\r\n(HyB) schemes. This work improves FDPB to save client buffering space as well as waiting time. In comparison with SB, RFB, and\r\nHyB, the improved FDPB scheme can yield the smallest waiting time under the same buffer requirements....
With the rapid advance in multimedia streaming and multicast transport technology, current IP multicast protocols, especially\r\nPIM-SM, become the major channel delivery mechanism for IPTV system over Internet. The goals for IPTV service are to provide\r\ntwo-way interactive services for viewers to select popular program channel with high quality for watching during fast channel\r\nsurfing period.However, existing IPmulticast protocol cannot meet above QoS requirements for IPTV applications between media\r\nserver and subscribers. Therefore, we propose a cooperative scheme of hybrid-tree based on explicit routedmulticast, called as HTERM\r\nto combine the advantages of shared tree and source tree for QoS-supported IPTV service. To increase network utilization,\r\nthe constrained shortest path first (CSPF) routing algorithm is designed for construction of hybrid tree to deliver the high-quality\r\nvideo stream over watching channel and standard quality over surfing channel. Furthermore, the Resource Reservation Protocol-\r\nTraffic Engineering (RSVP-TE) is used as signaling mechanism to set up QoS path for multicast channel admission control. Our\r\nsimulation results demonstrated that the proposed HT-ERM scheme outperforms other multicast QoS-based delivery scheme in\r\nterms of channel switching delay, resource utilization, and blocking ratio for IPTV service....
A reliable video communication system is proposed based on data partitioning feature of H.264/AVC, used to create a layered\r\nstream, and LT codes for erasure protection. The proposed scheme termed rate adaptive selective segment assignment (RASSA)\r\nis an adaptive low-complexity solution to varying channel conditions. The comparison of the results of the proposed scheme is\r\nalso provided for slice-partitioned H.264/AVC data. Simulation results show competitiveness of the proposed scheme compared to\r\noptimized unequal and equal error protection solutions. The simulation results also demonstrate that a high visual quality video\r\ntransmission can be maintained despite the adverse effect of varying channel conditions and the number of decoding failures can\r\nbe reduced....
Peer-to-peer is emerging as a potentially disruptive technology for content distribution in the mobile Internet. In addition to\r\nthe already well-known peer-to-peer file sharing, real-time peer-to-peer streaming is gaining popularity. This paper presents an\r\neffective real-time peer-to-peer streaming system for the mobile environment. The basis for the system is a scalable overlay network\r\nwhich groups peer into clusters according to their proximity using RTT values between peers as a criteria for the cluster selection.\r\nThe actual media delivery in the system is implemented using the partial RTP stream concept: the original RTP sessions related\r\nto a media delivery are split into a number of so-called partial streams according to a predefined set of parameters in such a way\r\nthat it allows low-complexity reassembly of the original media session in real-time at the receiving end. Partial streams also help\r\nin utilizing the upload capacity with finer granularity than just per one original stream. This is beneficial in mobile environments\r\nwhere bandwidth can be scarce....
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