A new MAC protocol using AWRR/DT in broadband wireless networks: Novel contention methods

Jae Jeong Shim, Jae Young Pyun, Sung Jea Ko

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A new MAC protocol using the Adaptive Weighted Round Robin with Delay Tolerance (AWRR/DT) [1] is presented. The proposed protocol is a type of centralized MAC protocol where the base station performs most operations. By using the AWRR/DT scheduler, we can guarantee delay QoS to different traffics without the heavy overhead induced by packet-based tagging techniques. In order to enhance the efficiency of random access systems, the proposed protocol employs three novel contention methods: slotted ALOHA with threshold, contention method using adaptive contention period, and traffic-specific contention method. Simulation results show that the proposed protocol guarantees delay bounds by using the AWRR/DT. The slotted ALOHA with threshold suffers less collisions than the regular slotted ALOHA when mobile terminals request slots. The method using adaptive contention period adjusts the length of contention period of each frame to relieve the performance degradation by collisions. The traffic-specific contention method provides a priority handling mechanism to contention-based systems. Experimental results of each contention method are provided.

Original languageEnglish
Pages (from-to)1308-1319
Number of pages12
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Issue number6
Publication statusPublished - 2002 Jun


  • ATM
  • Contention method
  • MAC Protocol
  • QoS
  • Scheduling

ASJC Scopus subject areas

  • Signal Processing
  • Computer Graphics and Computer-Aided Design
  • Electrical and Electronic Engineering
  • Applied Mathematics


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