[논문]Channel Aware Sparse Transmission for Ultra Low-Latency Communications in TDD Systems

Kim, Wonjun; Ji, Hyoungju; Shim, Byonghyo

doi:10.1109/tcomm.2019.2955465

[해외논문] Channel Aware Sparse Transmission for Ultra Low-Latency Communications in TDD Systems 원문보기

IEEE transactions on communications, v.68 no.2, 2020년, pp.1175 - 1186

Kim, Wonjun (Institute of New Media and Communications and the Department of Electrical and Computer Engineering, Seoul National University, Seoul, South Korea) , Ji, Hyoungju (Samsung Research, Seoul, South Korea) , Shim, Byonghyo (Institute of New Media and Communications and the Department of Electrical and Computer Engineering, Seoul National University, Seoul, South Korea)

Abstract ▼ AI-Helper

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.

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