Abstract
Real-time applications usually not only have a certain Packet Loss Ratio (PLR) requirement but also can have strict delay constraints. In the past, we proposed a Hybrid Error Correction (HEC) scheme with Packet Repetition (PR) technique for guaranteeing a certain PLR requirement under strict delay constraints. Unfortunately, the HEC-PR scheme can only work efficiently in multicast scenarios with small group size and small link PLR. Our further studies show that better performance can be obtained by combining the HEC-PR scheme with other traditional HEC schemes such as Type I HARQ and Type II HARQ techniques. Based on this idea, in this paper, a novel Adaptive HEC (AHEC) scheme combining the HEC-PR scheme with Type I and Type II HARQ techniques is proposed to satisfy a certain PLR requirement for delay bounded multicast services. Furthermore, the performance of the AHEC scheme is optimized by choosing the scheme with the least needed redundancy information automatically among the three HEC schemes. Finally, by applying the AHEC scheme in a typical wireless DVB scenario, we analyze the performances of the AHEC scheme and compare it with the HEC-PR scheme and an Adaptive Forward Error Correction (AFEC) scheme. The results show that the proposed AHEC scheme outperforms both the AFEC scheme and the HEC-PR scheme.
Highlights
With the rapid development of broadband wireless networks, more and more attention has turned to distributing real time multimedia services over wireless networks
We firstly analyze the performances of three schemes over an erasure error channel: the HECPR scheme, the Adaptive Forward Error Correction (AFEC) scheme and the Adaptive HEC (AHEC) scheme, respectively; and compare them with each other
We study the effect of the parameter k in the AHEC scheme
Summary
With the rapid development of broadband wireless networks, more and more attention has turned to distributing real time multimedia services over wireless networks. To show the packet loss issue in wireless real-time multicast systems, we will take the practical Digital Video Broadcasting (DVB) services over wireless LANs as the example for illustration. Different retransmission-based schemes for error control in multicast protocols geared toward real-time multimedia applications are analyzed in [14]. Using retransmission based error control mechanism with a Packet Repetition (PR) technique; we developed an HEC-PR scheme for satisfying the target PLR requirement under strict delay constraints and optimized its performance in [13] for DVB distribution in home networks. To the best of our knowledge, no general frameworks combining those HEC schemes have been proposed before for optimizing the performance of those schemes under strict delay constraints. Is the number of ways h objects can be chosen from among m objects without repetition
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