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Reduced CBG HARQ Feedback for Efficient Multimedia Transmissions in 5G for Coexistence with URLLC Traffic

: Göktepe, B.; Fehrenbach, T.; Schierl, T.; Hellge, C.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Broadcast Technology Society:
Leading the way to future multimedia and broadcasting: 13th IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB 2018 : 6-8 June 2018, Valencia (Spain)
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-5386-4729-5
ISBN: 978-1-5386-4730-1
International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB) <13, 2018, Valencia>
Conference Paper
Fraunhofer HHI ()

In recent 5G standardization activities, finely granular HARQ feedback (CBG HARQ) for partial retransmissions was introduced to support high data rates, while enabling coexistence with ultra-reliable low latency communication (URLLC). However, the CBG HARQ scheme comes with the drawback of increased feedback payload. In this paper, we discuss two reduced HARQ feedback schemes for using partial retransmissions, as used in CBG HARQ, while decreasing the feedback overhead implicated by finely granular feedback. These schemes exploit information on the location of puncturing by URLLC traffic, designated as Preemption Indication (PI). In this work, we show that these schemes achieve a similar performance to the regular CBG HARQ scheme, while significantly lowering the feedback overhead burden on the communication system.