TY - JOUR
T1 - How URLLC can Benefit from NOMA-based Retransmissions
AU - Kotaba, Radoslaw
AU - Manchon, Carles Navarro
AU - Balercia, Tommaso
AU - Popovski, Petar
PY - 2021/3
Y1 - 2021/3
N2 - Among the new types of connectivity unleashed by the emerging 5G wireless systems, Ultra-Reliable Low Latency Communication (URLLC) is perhaps the most innovative, yet challenging one. Ultra-reliability requires high levels of diversity, however, the reactive approach based on packet retransmission in HARQ protocols should be applied carefully to conform to the stringent latency constraints. The main premise of this paper is that the NOMA principle can be used to achieve highly efficient retransmissions by allowing concurrent use of wireless resources in the uplink. We introduce a comprehensive solution that accommodates multiple intermittently active users, each with its own HARQ process. The performance is investigated under two different assumptions about the Channel State Information (CSI) availability: statistical and instantaneous. The results show that NOMA can indeed lead to highly efficient system operation compared to the case in which all HARQ processes are run orthogonally.
AB - Among the new types of connectivity unleashed by the emerging 5G wireless systems, Ultra-Reliable Low Latency Communication (URLLC) is perhaps the most innovative, yet challenging one. Ultra-reliability requires high levels of diversity, however, the reactive approach based on packet retransmission in HARQ protocols should be applied carefully to conform to the stringent latency constraints. The main premise of this paper is that the NOMA principle can be used to achieve highly efficient retransmissions by allowing concurrent use of wireless resources in the uplink. We introduce a comprehensive solution that accommodates multiple intermittently active users, each with its own HARQ process. The performance is investigated under two different assumptions about the Channel State Information (CSI) availability: statistical and instantaneous. The results show that NOMA can indeed lead to highly efficient system operation compared to the case in which all HARQ processes are run orthogonally.
KW - HARQ
KW - NOMA
KW - Reliability
KW - Resource management
KW - Time-frequency analysis
KW - URLLC
KW - Ultra reliable low latency communication
KW - Uplink
KW - Wireless communication
KW - radio resource management
KW - uplink
UR - http://www.scopus.com/inward/record.url?scp=85096848866&partnerID=8YFLogxK
U2 - 10.1109/TWC.2020.3035517
DO - 10.1109/TWC.2020.3035517
M3 - Journal article
SN - 1536-1276
VL - 20
SP - 1684
EP - 1699
JO - I E E E Transactions on Wireless Communications
JF - I E E E Transactions on Wireless Communications
IS - 3
M1 - 9254087
ER -