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

Optimal reserved resources to ensure the repetitions in ultra-reliable low-latency communication uplink grant-free transmission

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

EUCNC 2019, European Conference on Networks and Communications, 18-21 June 2019, Valencia, Spain

To meet the strict requirements of Ultra-Reliable Low-Latency Communication in the uplink, grant-free uplink transmission has been specified, allowing the UE to transmit data in a random-access fashion without first transmitting a scheduling request and then waiting for a uplink grant from the gNB. To further increase the reliability, these grant-free uplink transmissions can be repeated without waiting for HARQ feedback from the gNB. However, these repetitions have to happen within a certain interval to avoid a confusion in HARQ IDs of different HARQ processes. When a UE starts transmitting late in the interval, it, therefore, can not exploit all the possible repetitions and thus reliability and latency decrease. In this paper, a scheme based on reserved resources is proposed to ensure the number of repetitions in a specific period. The size of each reserved resource is optimized depending on its position so as to reduce resource consumption. The scheme evaluated by theoretical analysis and numerical results shows its benefits to system performance.

Document Doi Bibtex

Titre:Optimal reserved resources to ensure the repetitions in ultra-reliable low-latency communication uplink grant-free transmission
Mots Clés:5G, URLLC, repetitions, uplink scheduling scheme, reserved resources
Type:Conférence
Langue:English
Ville:Valencia
Pays:ESPAGNE
Date:
Département:Systèmes de Communication
Eurecom ref:5898
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Bibtex: @inproceedings{EURECOM+5898, doi = {http://dx.doi.org/10.1109/EuCNC.2019.8801971}, year = {2019}, title = {{O}ptimal reserved resources to ensure the repetitions in ultra-reliable low-latency communication uplink grant-free transmission}, author = {{L}e, {T}rung-{K}ien and {S}alim, {U}mer and {K}altenberger, {F}lorian}, booktitle = {{EUCNC} 2019, {E}uropean {C}onference on {N}etworks and {C}ommunications, 18-21 {J}une 2019, {V}alencia, {S}pain}, address = {{V}alencia, {ESPAGNE}}, month = {06}, url = {http://www.eurecom.fr/publication/5898} }
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