Joint Sum Rate and Blocklength Optimization in RIS-Aided Short Packet URLLC Systems

In this letter, a multi-objective optimization problem (MOOP) is proposed for maximizing the achievable finite blocklength (FBL) rate while minimizing the utilized channel blocklengths (CBLs) in a reconfigurable intelligent surface (RIS)-assisted short packet communication system. The formulated MOO...

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Bibliographic Details
Published in:IEEE communications letters 2022-08, Vol.26 (8), p.1838-1842
Main Authors: Hashemi, Ramin, Ali, Samad, Mahmood, Nurul Huda, Latva-Aho, Matti
Format: Article
Language:English
Subjects:
Array signal processing
Azimuth
Beamforming
Communications systems
Error probability
Maximization
Multi-objective optimization
Multiple objective analysis
Optimization
reconfigurable intelligent surface (RIS)
Resource management
short packet communication
Ultra reliable low latency communication
Wireless sensor networks
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Summary:In this letter, a multi-objective optimization problem (MOOP) is proposed for maximizing the achievable finite blocklength (FBL) rate while minimizing the utilized channel blocklengths (CBLs) in a reconfigurable intelligent surface (RIS)-assisted short packet communication system. The formulated MOOP has two objective functions namely maximizing the total FBL rate with a target error probability, and minimizing the total utilized CBLs which is directly proportional to the transmission duration. The considered MOOP variables are the base station (BS) transmit power, number of CBLs, and passive beamforming at the RIS. Since the proposed non-convex problem is intractable to solve, the Tchebyshev method is invoked to transform it into a single-objective OP, then the alternating optimization (AO) technique is employed to iteratively obtain optimized parameters in three main sub-problems. The numerical results show a fundamental trade-off between maximizing the achievable rate in the FBL regime and reducing the transmission duration. Also, the applicability of RIS technology is emphasized in reducing the utilized CBLs while increasing the achievable rate significantly.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2022.3180396