QoS-Aware Cross-Layer Optimization of Hybrid DSL-LTE Access Networks


Chuah, Teong Chee and Lee, Ying Loong (2020) QoS-Aware Cross-Layer Optimization of Hybrid DSL-LTE Access Networks. IEEE Systems Journal, 14 (2). pp. 2175-2186. ISSN 1932-8184

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This paper adopts a system view of the hybrid digitalsubscriber line (DSL) long-term evolution (LTE) access networkand presents a framework to perform cooperative downstreamresource allocation. Such a hybrid network is of particular interestto rural and remote areas served with slow DSL connections not be-ing able to deliver bandwidth-demanding services. The frameworkaddresses practical resource allocation challenges encountered bysuch hybrid systems, notably on the need to tackle different dy-namics of the wireline and wireless channels, and to accommodatesubscribers’ diverse traffic demands. We introduce the conceptof throughput gap (TG), which plays a pivotal role in forgingefficient internetwork resource allocation for the hybrid networkwhile facilitating coexistence of legacy DSL modems. Specifically,underutilized LTE resource blocks are opportunistically scheduledas an add-on, on an on-demand basis, to fill the TG of the hybridmodem. Based on this concept, the resource allocation problem isformulated as a system throughput maximization problem, subjectto resource availability, TG fulfillment, user admission, transmitpower, and physical resource block allocation constraints. We de-compose this difficult mixed-integer programming problem intothree subproblems that can be solved sequentially. Efficient nu-merical algorithms are proposed to solve these subproblems, whichmap to different layers of the LTE protocol stack, and are coupledthrough signaling exchanges to solve the master problem, resultingin a cross-layer design. Simulation results show that the proposedscheme provides converged network operators a cost-effective al-ternative to increase the throughput of slow DSL connections whenthe need arises by leveraging existing LTE infrastructure.

Item Type: Article
Uncontrolled Keywords: Digital subscriber line (DSL), dynamic spectrum management (DSM), long-term evolution (LTE), radio resource management (RRM)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 13 Dec 2020 12:27
Last Modified: 13 Dec 2020 12:27
URII: http://shdl.mmu.edu.my/id/eprint/7830


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