PDCCH Signaling Constrained Mean SNR-Based Resource Allocation for Semi-Persistent Scheduler

As part of their key requirements, upcoming generation networks like 5G are expected to support a diverse category of traffic classes like enhanced Mobile Broadband (eMBB) and Ultra-Reliable & Low-Latency Communications (URLLC) in addition to an ever-increasing periodic traffic of small packets like Massive Machine-Type Communications (mMTC) and voice. Hence, there is a need for a semi-persistent scheduler (SPS) that schedules the periodic traffic with minimum resource consumption, so as to leave enough space for other schedulers to serve the remaining traffic classes well. However, for SPS, such an attempt in resource consumption reduction cannot be done independently without considering its effect on sparsely available Physical Downlink Control Channel (PDCCH) that are used for dynamic scheduling of packets from other traffic classes and SPS packets that need re-transmissions as well. To the best of our knowledge, such a work is missing in the literature. Motivated by this, in this paper, we propose a channel quality aware resource allocating semi-persistent scheduler that considers the trade off between resource usage and PDCCH signaling and derives the optimal number of physical resource blocks (PRBs) to allocate to an arriving SPS user under a PDCCH constraint.