TY - GEN
T1 - Improving Spectral Efficiency in URLLC via NOMA-Based Retransmissions
AU - Kotaba, Radoslaw
AU - Manchon, Carles Navarro
AU - Pratas, Nuno Manuel Kiilerich
AU - Balercia, Tommaso
AU - Popovski, Petar
PY - 2019/5
Y1 - 2019/5
N2 - The requirement to accommodate ultra-reliable low latency communication (URLLC) is one of the most attractive, yet challenging, new features of upcoming 5G systems. A common way to achieve reliability is retransmission; however, the applicability of this mechanism is hindered by the strict latency requirements. Furthermore, the bandwidth is often limited and shared by multiple connections, which may put the packet into a retransmission queue, leading to even larger latency. We address this problem in an uplink setting by introducing the concept of non-orthogonal multiple access hybrid automatic repeat request (NOMA-HARQ). In essence, NOMA-HARQ allows newly incoming packets to share non-orthogonally the same resource with retransmitted packets. The reliability guarantees are preserved by designing a power optimization procedure that takes into account past transmission attempts as well as the time remaining until the deadline.
AB - The requirement to accommodate ultra-reliable low latency communication (URLLC) is one of the most attractive, yet challenging, new features of upcoming 5G systems. A common way to achieve reliability is retransmission; however, the applicability of this mechanism is hindered by the strict latency requirements. Furthermore, the bandwidth is often limited and shared by multiple connections, which may put the packet into a retransmission queue, leading to even larger latency. We address this problem in an uplink setting by introducing the concept of non-orthogonal multiple access hybrid automatic repeat request (NOMA-HARQ). In essence, NOMA-HARQ allows newly incoming packets to share non-orthogonally the same resource with retransmitted packets. The reliability guarantees are preserved by designing a power optimization procedure that takes into account past transmission attempts as well as the time remaining until the deadline.
UR - http://www.scopus.com/inward/record.url?scp=85070205687&partnerID=8YFLogxK
U2 - 10.1109/ICC.2019.8761473
DO - 10.1109/ICC.2019.8761473
M3 - Article in proceeding
AN - SCOPUS:85070205687
SN - 978-1-5386-8089-6
T3 - I E E E International Conference on Communications
BT - ICC 2019 - 2019 IEEE International Conference on Communications (ICC)
PB - IEEE (Institute of Electrical and Electronics Engineers)
T2 - 2019 IEEE International Conference on Communications, ICC 2019
Y2 - 20 May 2019 through 24 May 2019
ER -