Reliability Oriented Dual Connectivity for URLLC services in 5G New Radio

Abstract

Novel solutions are required to meet the stringent reliability and latency requirements targeted for the Ultra Reliable Low Latency Communication service class, which emerged with the introduction of 5G new radio. This paper analyses reliability-oriented multi-Connectivity-where the same data packet is independently transmitted through multiple links-as such a solution. Multi-connectivity is first presented at a conceptual level. We then propose a novel admission mechanism to control the number of users operating in multi-connectivity mode. Finally, the reliability and latency enhancement with multi-connectivity in heterogeneous network scenario with multi-service traffic is evaluated via system level simulation. Up to 23% latency reduction and 57% reliability improvements over the single connectivity solution are observed. However such gains are sensitive to the configuration criteria, and the average gains are more modest.

Dynamic Multi-Connectivity Activation for Ultra-Reliable and Low-Latency Communication

“…Table II) and hence benefit from MC operation, the latency improvement with MC (both legacy and the proposed algorithm) is only marginal compared to SC mode. This conforms with the earlier findings reported in [13]. Moreover, legacy MC is found to result in lower latency compared to the proposed algorithm, since the proposed algorithm prioritizes resource efficiency by operating users which can accommodate additional retransmissions in SC mode.…”

“…In 5G NR, MC has been identified as a reliability enhancement solution using data duplication [12], where the packet failure probability is reduced by independently transmitting the same data packet to the target UE from multiple base station. Reliability oriented MC is presented and evaluated in details in [13], while an analytical framework to arXiv:1911.10007v1 [cs.NI] 22 Nov 2019 investigate the performance vs. resource utilization trade off with MC is presented in [14].…”

Reliability and Error Burst Length Analysis of Wireless Multi-Connectivity

“…The objective is to provide the desired reliability to numerous users by assigning only the necessary amount of resources to each of them. Mahmood et al [4] investigated a similar problem in a heterogeneous network scenario with a small cell and a macro cell. Their results show that multi-connectivity is particularly useful for cell-edge UEs connected to the small cell, and provides even greater benefits when URLLC and enhanced mobile broadband (eMBB) traffic coexist.…”

Predictive Network Control in Multi-Connectivity Mobility for URLLC Services

“…In addition, an admission control mechanism based on mainly the user's channel quality is designed. Although the proposed mechanism is highly sensitive to the configuration criteria [7], latency reduction and reliability improvements compared to single connectivity are observed. Furthermore, in the context of DC HetNet connectivity, a flow control algorithm for the connections between MacroCs and SmallCs is shown in [8].…”

“…Moreover, DC, as an initial case of MC, is studied in [6], where its architecture, functionalities and performance aspects are presented. MC, as a novel feature to enhance reliability and reduce the packet failure probability (by transmitting data packets to the UE from multiple cells independently), is considered in [7]. In addition, an admission control mechanism based on mainly the user's channel quality is designed.…”