Multi-Cell Reception for Uplink Grant-Free Ultra-Reliable Low-Latency Communications

Jacobsen, Thomas; Abreu, Renato; Berardinelli, Gilberto; Pedersen, Klaus I.; Kovács, István Z.; Mogensen, Preben

doi:10.1109/access.2019.2923324

Cited by 25 publications

(13 citation statements)

References 23 publications

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“…This is however inevitable for ultra reliable communication with low latencies. For instance, in [46], URLLC targeting 1 ms latency with grant free transmission in 5G NR was shown to result in a spectral efficiency loss up to a factor of ×10 relative to best effort mobile broadband. It is worth mentioning that a packet repetition scheme has advantages in terms of implementation complexity with respect to a single transmission at a lower coding rate, since it reduces the required buffer size at the receiver.…”

Section: A Technology Enablersmentioning

confidence: 99%

Towards 6G in-X Subnetworks With Sub-Millisecond Communication Cycles and Extreme Reliability

et al. 2020

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The continuous proliferation of applications requiring wireless connectivity will eventually result in latency and reliability requirements beyond what is achievable with current technologies. Such applications can for example include industrial control at the sensor-actuator level, intra-vehicle communication, fast closed loop control in intra-body networks and intra-avionics communication. In this article, we present the design of short range Wireless Isochronous Real Time (WIRT) in-X subnetworks aimed at life-critical applications with communication cycles shorter than 0.1 ms and outage probability below 10 −6. Such targets are clearly beyond what is supported by the 5th Generation (5G) radio technology, and position WIRT as a possible 6th Generation (6G) system. WIRT subnetworks are envisioned to be deployed for instance in industrial production modules, robots, or inside vehicles. We identify technology components as well as spectrum bands for WIRT subnetworks and present major design aspects including frame structure and transmission techniques. The performance evaluation considering a dense scenario with up to 2 devices per m 2 reveal that a multi-GHz spectrum may be required for ensuring high spatial service availability. The possibility of running WIRT as an ultra-wideband underlay system in the centimeter-wave spectrum region is also discussed. Aspects related to design of techniques for the control plane as well as enhancements to the presented design is the focus of our ongoing research.

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Section: A Technology Enablersmentioning

confidence: 99%

Towards 6G in-X Subnetworks With Sub-Millisecond Communication Cycles and Extreme Reliability

et al. 2020

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“…In [17], the ergodic achievable rate was observed during the full-duplex mode of DL and UL. It used the conventional half-duplex data transmission based on the channel state indicator (CSI) feedback [18]. In [19], the author demonstrated the radio resource management which plays an important role in increasing spectral efficiency capacity in joint multi-cell reception over single-cell reception.…”

Section: Related Workmentioning

confidence: 99%

Multiuser Scheduling In 3GPP LTE-A Uplink Non-Stand-Alone Cellular Network With Virtual MIMO

Kukade¹,

Sutaone²,

Patil³

2021

Preprint

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New 5G architecture gives access to New Radio (NR) with co-exist LTE. 3GPP LTE-A transition towards NR is a wireless technology that is widely employed in the cellular mobile network to support significantly high volume traffic. In this paper, we propose the best N-subset reduction and a modified RME algorithm (BNSRME) as an uplink multiuser scheduler. It is responsible for allocating resources among the active users in the most effective manner. The N-subset reduction method selects the best chunk of continuous resource blocks from the available system bandwidth. Users are assigned chunks based on channel-dependent selection and utility function. The BNSRME scheduling algorithm aims to optimize performance, spectral efficiency, and allows multiuser scheduling where multiple active users are allocated the same time-frequency resources. We consider the threshold cap SNRT to improve sensitivity quality for satisfactory users. The approach is MU scheduling which will be the most commonly deployed in non-stand-alone (NSA) 5G uplink cellular network. The result shows that the system spectral efficiency improves by 32.55 % by using the proposed multiuser algorithm compared to single user scheduling in an uplink. It has been shown that its performance can be further improved by using the MU-MIMO system.

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“…To overcome the timely handshaking procedures of grant-based scheduling in UL, the studies in [21] and [22] investigate grant free and semi-grant free access protocols, respectively. UL multi-cell reception design has been extensively addressed in [23] by comparing the achievable capacity of various receivercombining techniques. Several studies explore URLLC for vehicular communications [24]- [29].…”

Section: A Brief Overview Of the State Of The Art On Urllcmentioning

confidence: 99%

On the Multiplexing of Data and Metadata for Ultra-Reliable Low-Latency Communications in 5G

Karimi

Pedersen

Mahmood

et al. 2020

IEEE Trans. Veh. Technol.

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This paper addresses the problem of downlink radio resource management for ultra-reliable low-latency communications (URLLC) in fifth generation (5G) systems. To support low-latency communications, we study performance of two multiplexing schemes namely in-resource control signalling and joint encoding of data and metadata. In the former, the metadata and data are separately encoded and the metadata is sent at the beginning of transmission time prior to the data. Thus, it benefits from a low-complexity receiver structure to decode the data block. The latter takes advantages of transmitting a larger blocklength to enhance the reliability and improve spectrum efficiency by jointly encoding data and metadata as a single codeword. Dealing with small URLLC payloads, the overhead and error of sending metadata are not negligible and have a significant impact on the system performance in terms of resource usage the reliability of transmission. For each scheme, we derive expressions for the outage probability and resource usage by taking into account impacts of the finite blocklength payloads, overhead and error of sending metadata, and probability of error in uplink feedback channel. We propose a novel framework for joint data and metadata link adaptation to minimize the average number of allocated resources, while ensuring the stringent URLLC quality of service requirements. An optimization problem is formulated for each scheme that is mixed-integer nonconvex problem, difficult to solve in polynomial time. Solutions based on successive convex optimization are proposed. Numerical evaluations show that the proposed algorithms perform close to the optimal solution and demonstrate remarkable gains of up to 27% improvement in resource usage. Finally, we present sensitivity analysis of the results for various network parameters.

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Multi-Cell Reception for Uplink Grant-Free Ultra-Reliable Low-Latency Communications

Cited by 25 publications

References 23 publications

Towards 6G in-X Subnetworks With Sub-Millisecond Communication Cycles and Extreme Reliability

Towards 6G in-X Subnetworks With Sub-Millisecond Communication Cycles and Extreme Reliability

Multiuser Scheduling In 3GPP LTE-A Uplink Non-Stand-Alone Cellular Network With Virtual MIMO

On the Multiplexing of Data and Metadata for Ultra-Reliable Low-Latency Communications in 5G

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