2019/05/31 by Gustavo Kasper Facenda, Danilo Silva
Computer Science · Engineering · Mathematics · #Channel (broadcasting) #Channel state information #Computer network #Computer science #Cooperative Communication and Network Coding #Distributed computing #Error Correcting Code Techniques #Gaussian #Mathematical optimization #Mathematics #Random access #Scheduling (production processes) #Scheme (mathematics) #Telecommunications #Theoretical computer science #Wireless #Wireless Communication Security Techniques #cs.IT #math.IT
paper · pdf · doi:10.1109/twc.2020.3013809
published as IEEE Transactions on Wireless Communications, vol 19, no. 11, pp. 7598-7609, Nov 2020 · 12 double column pages, 1 figure, to appear in IEEE Transactions on Wireless Communications
arxiv created 2020/07/30 · openalex publication_date 2020/08/10 · arxiv updated 2020/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
This article investigates the massive random access Gaussian channel with a focus on small payloads. For this problem, grant-based schemes have been regarded as inefficient due to the necessity of large feedbacks and the use of inefficient scheduling request methods. This articles attempts to answer whether grant-based schemes can be competitive against state-ot-art grantless schemes and worthy of further investigation. In order to compare these schemes fairly, a novel model is proposed, and, under this model, a novel grant-based scheme is proposed. The scheme uses Ordentlich and Polyanskiy's grantless method to transmit small coordination indices in order to perform the scheduling request, which allows both the request from the users to be efficient and the feedback to be small. We also present improvements to the Ordentlich and Polyanskiy's scheme, allowing it to transmit information through the choice of sub-block, as well as to handle collisions of the same message, significantly improving the method for very small messages. Simulation results show that, if a small feedback is allowed, the proposed scheme performs closely to the state-of-art while using simpler coding schemes, suggesting that novel grant-based schemes should not be dismissed as a potential solution to the massive random access problem.