Paper Info
Title
Channel Aware Sparse Transmission for Ultra Low-Latency Communications in TDD Systems
Abstract
Major goal of ultra reliable and low latency communication (URLLC) is to reduce the latency down to a millisecond (ms) level while ensuring reliability of the transmission. Since the current uplink transmission scheme requires a complicated handshaking procedure to initiate the transmission, to meet this stringent latency requirement is a challenge in wireless system design. In particular, in the time division duplexing (TDD) systems, supporting the URLLC is difficult since the mobile device has to wait until the transmit direction is switched to the uplink. In this paper, we propose a new approach to support a low latency access in TDD systems, called channel aware sparse transmission (CAST). Key idea of the proposed scheme is to encode a grant signal in a form of sparse vector. This together with the fact that the sensing mechanism preserves the energy of the sparse vector allows us to use the compressed sensing (CS) technique in CAST decoding. From the performance analysis and numerical evaluations, we demonstrate that the proposed CAST scheme achieves a significant reduction in access latency over the 4G LTE-TDD and 5G NR-TDD systems.
Year
DOI
Venue
2020
10.1109/TCOMM.2019.2955465
IEEE Transactions on Communications
Keywords
Field
DocType
Mobile handsets,Uplink,Switches,Decoding,Long Term Evolution,Base stations
Transmission (mechanics),Computer science,Communication channel,Electronic engineering,Latency (engineering)
Journal
Volume
Issue
ISSN
68
2
0090-6778
Citations 
PageRank 
References 
0
0.34
0
Authors
3
Name
Order
Citations
PageRank
Wonjun Kim130126.50
Hyoungju Ji215314.66
Byonghyo Shim393788.51