Joint congestion control and OFDMA scheduling for hybrid wireline-wireless networks

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations


We consider joint congestion control and multiuser scheduling in a hybrid wireline and wireless network, where the air interface of wireless links is based on orthogonal frequency division multiplexing (OFDM). For static channels, we formulate this cross-layer design as a network utility maximization (NUM) problem with both wireline and wireless link constraints. The convexity of the problem enables a well-established dual-based approach to decompose it into two subproblems, the transport layer source rate adaptation and the medium access control (MAC) layer multiuser OFDM scheduling, which are connected and coordinated by link prices. While the rate and link price adjustments follow the same fashion as the conventional utility-based congestion control for wireline networks, the key difference is the multiuser OFDM scheduling performed at the wireless access point (AP). Independent from specific utilities used by each source, this scheduling problem always maximizes a wireless linkprice-weighted sum throughput (LPWST), which can be solved efficiently by a block-coordinate descent method, resulting in optimal subcarrier assignment and power allocation at the AP. Convergence of the dual-based algorithm is established using the convex optimization theory. To extend our results to dynamic wireless channels, we provide a NUM formulation with long-term average feasible rate region and develop a gradient scheduling algorithm to handle channel variations. Our work represents a systematic cross-design framework for distributed fair resource allocation in a hybrid network with both static and dynamic wireless channels.

Original languageEnglish (US)
Title of host publicationProceedings - IEEE INFOCOM 2007
Subtitle of host publication26th IEEE International Conference on Computer Communications
Number of pages9
StatePublished - Sep 4 2007
EventIEEE INFOCOM 2007: 26th IEEE International Conference on Computer Communications - Anchorage, AK, United States
Duration: May 6 2007May 12 2007

Publication series

NameProceedings - IEEE INFOCOM
ISSN (Print)0743-166X


OtherIEEE INFOCOM 2007: 26th IEEE International Conference on Computer Communications
CountryUnited States
CityAnchorage, AK

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