An Applicable Repeated Transmission for Low Latency and Reliable Services

• Published in: IEEE transactions on vehicular technology Vol. 69; no. 8; pp. 8468 - 8482
• Main Authors: Kim, Eunkyung, Lee, Yuro, Lee, Heesoo
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 3GPP; Algorithms; Computer simulation; Low latency communication; Network latency; Numerical analysis; Packet transmission; Parallel processing; Receivers; Redundancy; Reliability; reliable communication; repeated transmission; Transmitters; Uplink; URLLC; Wireless communication
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2020.2995846

For the fast access with high reliability, a single grant allows a transmitter to transmit multiple redundant packets with new redundancy information in the time domain without waiting for feedback from a receiver. However, entire redundant packets shall be retransmitted in response to a negative acknowledgment of those redundant packets, which increases the service latency. To reduce a long HARQ RTT due to a number of redundant packets, we propose packet-by-packet parallel processing that achieves lower latency by alleviating the long HARQ RTT of repeated transmission. We also provide a model and analysis for repeated transmission functionality, in terms of the wireless transmission latency with packet-by-packet processing. Numerical analysis and simulation in various network environments show that the proposed algorithm achieves lower latency without trading reliability off.