A cross-layer scheduling algorithm with QoS support in wireless networks

Qingwen Liu, Xin Wang, Georgios B. Giannakis

Research output: Contribution to journalArticlepeer-review

287 Scopus citations


Scheduling plays an important role in providing quality of service (QoS) support to multimedia communications in various kinds of wireless networks, including cellular networks, mobile ad hoc networks, and wireless sensor networks. The authors propose a scheduling algorithm at the medium access control (MAC) layer for multiple connections with diverse QoS requirements, where each connection employs adaptive modulation and coding (AMC) scheme at the physical (PHY) layer over wireless fading channels. Each connection is assigned a priority, which is updated dynamically based on its channel and service status; the connection with the highest priority is scheduled each time. The authors' scheduler provides diverse QoS guarantees, uses the wireless bandwidth efficiently, and enjoys flexibility, scalability, and low implementation complexity. Its performance is evaluated via simulations.

Original languageEnglish (US)
Pages (from-to)839-847
Number of pages9
JournalIEEE Transactions on Vehicular Technology
Issue number3
StatePublished - May 2006

Bibliographical note

Funding Information:
Manuscript received September 12, 2005; revised December 28, 2005. This work was prepared through collaborative participation in the Communications and Networks Consortium sponsored by the U.S. Army Research Laboratory under the Collaborative Technology Alliance Program, Cooperative Agreement DAAD19-01-2-0011. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation thereon. The material in this paper was presented in part at the 2nd International Conference on QoS in Heterogeneous Wired/Wireless Networks (QShine), Orlando, FL, August 22–24, 2005. The review of this paper was coordinated by Prof. X. Shen.


  • Adaptative modulation and coding (AMC)
  • Cross-layer design
  • IEEE 802.16
  • Quality of service (QoS)
  • Scheduling algorithm
  • Wireless networks
  • Worldwide interoperability for microwave access (WiMAX)


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