Reliability Analysis of Uplink Grant-Free Transmission Over Shared Resources

Uplink grant-free schemes have the promise of reducing the latency of a user-equipment-initiated transmission by avoiding the handshaking procedure for acquiring a dedicated scheduling grant. However, the possibility of successfully delivering a payload within a latency constraint may be severely co...

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Bibliographic Details
Published in:IEEE access 2018-01, Vol.6, p.23602-23611
Main Authors: Berardinelli, Gilberto, Huda Mahmood, Nurul, Abreu, Renato, Jacobsen, Thomas, Pedersen, Klaus, Kovacs, Istvan Z., Mogensen, Preben
Format: Article
Language:English
Subjects:
Bandwidth
Bandwidths
grant-free transmission
Multiple access
Network latency
Payloads
Performance evaluation
Power system reliability
Probability
Reliability
Reliability analysis
Standardization
Surface acoustic waves
Uplink
URLLC
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Summary:Uplink grant-free schemes have the promise of reducing the latency of a user-equipment-initiated transmission by avoiding the handshaking procedure for acquiring a dedicated scheduling grant. However, the possibility of successfully delivering a payload within a latency constraint may be severely compromised in case of grant-free operations over shared radio resources. In this paper, we study the performance of two different uplink grant-free schemes over shared resources recently discussed within the fifth generation new radio standardization, namely, a solution based on a stop-and-wait (SAW) protocol and a blind retransmission approach. Performance is evaluated assuming Rayleigh fading channels with a maximum ratio combining (MRC) multi-antenna receiver. Analytical results show the benefits of grant-free transmission with respect to the traditional grant-based approach for a tight latency constraint. A high-order receive diversity is beneficial to leverage the MRC gain and enables the possibility of achieving the 10 −5 outage probability target set for ultra-reliable low-latency communication services. The blind retransmission approach is significantly penalized by identification and signaling errors, while a SAW solution with potentially scheduled retransmissions out of the shared bandwidth leads to the lowest outage probability, at least for frequent packet arrivals.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2018.2827567