Abstract
A new hybrid automatic repeat request (HARQ) scheme for multicast service for wireless sensor networks is proposed in this study. In the proposed algorithm, the HARQ operation is combined with an autonomous retransmission method that ensure a data packet is transmitted irrespective of whether or not the packet is successfully decoded at the receivers. The optimal number of autonomous retransmissions is determined to ensure maximum spectral efficiency, and a practical method that adjusts the number of autonomous retransmissions for realistic conditions is developed. Simulation results show that the proposed method achieves higher spectral efficiency than existing HARQ techniques.
Highlights
IntroductionMulticast services have received considerable attention as a means for supporting point-tomultipoint applications such as video conferencing, mobile broadcasting, multimedia streaming services, and news distribution
Multicast services have received considerable attention as a means for supporting point-tomultipoint applications such as video conferencing, mobile broadcasting, multimedia streaming services, and news distribution. These applications are achieved in mobile networks by the inclusion of an enhanced multimedia broadcast multicast service and an enhanced multicast broadcast service (E-MBS) in current wireless communication standards such as the 3rd Generation Partnership
A new hybrid automatic repeat request (HARQ) scheme with autonomous retransmission was proposed for use in multicast service
Summary
Multicast services have received considerable attention as a means for supporting point-tomultipoint applications such as video conferencing, mobile broadcasting, multimedia streaming services, and news distribution. To reduce feedback overhead by means other than NACK-based common feedback, we propose a new HARQ scheme for transmitting multicast packets. HARQ scheme performs autonomous retransmission at the beginning of packet transmission That is, it automatically retransmits a packet a predetermined number of times without ACK/NACK feedback, and performs the HARQ operation in the conventional HARQ method. Since the proposed method does not use ACK channels during autonomous retransmission, the feedback overhead is reduced. The proposed scheme is potentially a practically applicable multicast transmission scheme in WSNs that can enhance spectral efficiency while guaranteeing QoS.
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