Ecole d'ingénieur et centre de recherche en Sciences du numérique

Strategies to meet the configured repetitions in URLLC Uplink grant-free transmission

Le, Trung-Kien; Salim, Umer; Kaltenberger, Florian

ISWCS 2019, 16th International Symposium on Wireless Communication Systems, 27-30 August 2019, Oulu, Finland

In Ultra-Reliable Low-Latency Communication (URLLC), the user (UE) can be configured to transmit in grant-free/configured-grant (GF/CG) resources for uplink (UL) transmission that does not require the UE to transmit scheduling request (SR) and receive UL grant to reduce latency. In addition, the UE is also configured to transmit automatically a specific number of repetitions without waiting feedback. However, these repetitions are only allowed to carry out in an interval with period P to avoid identity (ID) confusion in a Hybrid automatic repeat request (HARQ) process. Thereby, there is a chance that the UE cannot transmit all repetitions as configured if data arrives late and it leads to a drop of reliability. Two approaches are proposed in this paper to cope with this problem. This first approach requires an usage of the explicit HARQ feedback structure and the second one is related to an additional SR transmitted by the UE in parallel with data. The numerical results show the benefit of these two methods in increasing system performance in case of less configured repetitions made when they help the system to avoid or reduce packet loss due to Demodulation Reference Signal (DMRS) miss-detection.

Document Doi Bibtex

Titre:Strategies to meet the configured repetitions in URLLC Uplink grant-free transmission
Mots Clés:5G, URLLC, grant-free repetitions, uplink scheduling scheme, explicit HARQ feedback, scheduling reques
Type:Conférence
Langue:English
Ville:Istanbul
Pays:TURQUIE
Date:
Département:Systèmes de Communication
Eurecom ref:5960
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Bibtex: @inproceedings{EURECOM+5960, doi = {http://dx.doi.org/10.1109/ISWCS.2019.8877344}, year = {2019}, title = {{S}trategies to meet the configured repetitions in {URLLC} {U}plink grant-free transmission}, author = {{L}e, {T}rung-{K}ien and {S}alim, {U}mer and {K}altenberger, {F}lorian}, booktitle = {{ISWCS} 2019, 16th {I}nternational {S}ymposium on {W}ireless {C}ommunication {S}ystems, 27-30 {A}ugust 2019, {O}ulu, {F}inland}, address = {{I}stanbul, {TURQUIE}}, month = {08}, url = {http://www.eurecom.fr/publication/5960} }
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