Tampere University of Technology

TUTCRIS Research Portal

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

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)36300-36311
Number of pages12
JournalIEEE Access
Volume7
DOIs
Publication statusE-pub ahead of print - 21 Mar 2019
Publication typeA1 Journal article-refereed

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 quality-of-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.

Keywords

  • 3G mobile communication, 4G mobile communication, 5G mobile communication, cellular radio, Long Term Evolution, quality of service, resource allocation, telecommunication congestion control, telecommunication scheduling, telecommunication traffic, wireless LAN, QoS-aware LTE sessions offloading, LAA/WiFi systems, fifth-generation cellular systems, 3GPP new radio technology, radio resources, LTE network, LTE session offloading strategies, WiFi offloading, quality-of-service, resource reallocations, duty-cycle schedule-based Licensed Assisted LTE Access system, resource reallocation mechanism, schedule-based LAA system, traffic demands, traffic nature, Wireless fidelity, Quality of service, 3GPP, Throughput, Resource management, LTE, Licensed Assisted Access, LAA, QoS, WiFi, elastic traffic, session interruption probability, drop probability, mean bit rate

Publication forum classification