Soft HARQ for Efficient Transmission in MTC
نویسنده
چکیده
A novel service-based soft HARQ scheme for Machine Type Communication (MTC) is proposed in this paper. Conventionally, the repetition number for each HARQ retransmission is fixed. In contrast, in our soft HARQ scheme the repetition number is selected to optimize specific objective functions corresponding to diverse service demands. Based on this, three soft HARQ strategies, namely Strategies EM/DM/CO are designed for efficiency maximization, delay minimization and comprehensive optimization, respectively. The simulation results show that, comparing with conventional HARQ, soft HARQ Strategy EM promotes the throughput without significant increasing the transmission delay. Soft HARQ Strategy DE lowers the transmission delay while the throughput does not decrease significantly. Soft HARQ Strategy CO increases the throughput and decreases the transmission delay simultaneously. Our service-based soft HARQ can also be generalized for scenarios other than MTC. Keywords—Soft HARQ; soft ACK/NACK; MTC; Delay; Spectral efficiency.
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