Abstract
Abstract Multimedia streaming using a multicast scheme over IEEE 802.11 multi-rate wireless local area networks (WLANs) faces many challenges owing to the heterogeneous channel conditions of receivers. Although many multicast schemes have been proposed to support multimedia streaming over multi-rate WLANs, those schemes do not deal with multicast transmission efficiently. In this paper, a new leader-based multicast scheme with a Raptor code is proposed. The proposed scheme consists of a leader selection block, a scalable video coding (SVC) block with unequal error protection (UEP), and a link adaptation block with a Raptor code. In the proposed scheme, one of the multicast group members is selected as a multicast group leader according to a leader cost, and then link adaptation operates between the multicast transmitter and the multicast group leader. In addition, SVC, UEP, and Raptor code mechanisms are applied to guarantee the minimum required performance of multicast group members. The proposed scheme aims to enhance the link utilization and guarantees the minimum quality-of-service requirement of multicast group members. Simulation results show that the proposed scheme performs better than previous multicast schemes.
Highlights
IEEE 802.11 wireless local area networks (WLANs) have been successfully deployed in many indoor and outdoor environments
In [6], the transmission data rate is adapted to the user with the lowest signal-to-noise ratio (SNR) and, in [7], the channel conditions of all the users in the multicast group are reported for rate adaptation
In the proposed scheme, those nodes are compensated by the scalable video coding (SVC) with unequal error protection (UEP) and the Raptor code; they can be guaranteed to satisfy the minimum required quality of service (QoS) level which is over 31 dB peak signal-to-noise ratio (PSNR)
Summary
IEEE 802.11 wireless local area networks (WLANs) have been successfully deployed in many indoor and outdoor environments. In [6], the transmission data rate is adapted to the user with the lowest signal-to-noise ratio (SNR) and, in [7], the channel conditions of all the users in the multicast group are reported for rate adaptation In both schemes, additional signaling is required to obtain the SNR of all the receivers. We propose a new leader-based multicast scheme with a Raptor code in IEEE 802.11 multi-rate WLANs. By applying the proposed scheme, mobile nodes can utilize wireless channel capacity efficiently, with a minimum required QoS in a noisy wireless channel environment guaranteed.
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