Performance Assessment of QoS-Aware LTE Sessions Offloading Onto LAA/WiFi Systems

Abstract

The publication has been prepared with the support of the ''RUDN University Program 5-100.'' ABSTRACT Fifth-generation (5G) cellular systems are expected to orchestrate a variety of air interfaces. In this heterogeneous setting 4G, LTE systems will remain of special importance providing service over a relatively large area not covered with the 3GPP new radio technology. However, the scarcity of radio resources below 6 GHz as well as constantly increasing user traffic demands call for efficient offloading strategy from the LTE network. In this paper, we consider and compare two LTE session offloading strategies, including LAA and WiFi offloading. Although by design, the LAA system supports qualityof-service (QoS) guarantees in terms of minimum throughput, the assured performance might still be violated by resource reallocations when satisfying the compulsory fairness criteria. To assess and compare the performance of these schemes, we develop an analytical framework that takes into account specifics of duty-cycle schedule-based Licensed Assisted LTE Access (LAA) system with connection admission control (CAC), resource reallocation mechanism, and realistic elastic traffic nature. As a special case of the developed framework, we also address the offloading of QoS-aware LTE sessions into conventional WiFi. Our numerical results indicate that WiFi offloading is characterized by a significantly greater number of offloaded sessions. However, this advantage comes at the expense of severe performance degradation in terms of minimum throughput guarantees. Implementing CAC procedures, LAA efficiently addresses this problem. We conclude that WiFi offloading of QoS-aware LTE sessions can be used in light traffic conditions only. On the other hand, offloading to the schedule-based LAA system allows preserving QoS over a wide range of arrival traffic statistics.

Performance of Offloading Strategies in Collocated Deployments of Millimeter Wave NR-U Technology

“…However, in their study, the authors considered only a single NR-U BS and also did not include the specifics of random access scheme in the unlicensed band in their model. In spite of focusing on LAA technology, the authors in [21], [22] developed and analyzed a simple duty-cycle based scheme for fair resource splitting between LTE-U and Wi-Fi operating in the unlicensed band.…”

Traffic Modelling of Low Dense Femtocellular Network for Long Term Evolution

“…To combat the fading affect we consider MIMO link discussed in next subsection. (12) where r is the random variable of channel gain between the antenna elements.…”

Mathematical Modeling of Joint Operation of Wireless Local Area Networlss and Fifth Generation Cellular Networks

“…A number of works, such as, e.g., [9,11], use analytical modeling to optimize the sharing of a wireless channel between LTE-LAA and Wi-Fi networks under the unrealistic assumption that the LTE-LAA base station has the ability to fully control the distribution of the channel resource.…”