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Next-generation internet-of-things (IoT) networks require extremely lowlatency, complexity, and collision probability. We introduce the novelpartial-information multiple access (PIMA) scheme, a semi-grant-free (GF)coordinated random access (RA) protocol for short packet transmission, with theaim of reducing the latency and packet loss of traditional multiple accessschemes, as well as more recent preamble-based schemes. With PIMA, the basestation (BS) acquires partial information on instantaneous traffic conditionsin the partial information acquisition (PIA) sub-frame, estimating the numberof active devices, i.e., having packets waiting for transmission in theirqueue. Based on this estimate, the BS chooses both the total number of slots tobe allocated in the data transmission (DT) sub-frame and the respectiveuser-to-slot assignment. Although collisions may still occur due to multipleusers assigned to the same slot, they are drastically reduced with respect tothe slotted ALOHA (SALOHA) scheme, while achieving lower latency than bothtime-division multiple-access (TDMA) and preamble-based protocols, due to theextremely reduced overhead of the PIA sub-frame. Finally, we analyze and assessthe performance of PIMA under various activation statistics, proving therobustness of the proposed solution to the intensity of traffic, also withburst traffic.

Semi-Grant-Free Orthogonal Multiple Access with Partial-Information for Short Packet Transmissions