Real-Time Bandwidth Allocation (RTBA): A packet scheduling algorithm for WCDMA systems

Yu Min Chiu*, Jyh-Cheng Chen

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


Time-to-expiration, unsent data size, and location-dependent channel capacity and errors are three key factors for fairness service and real-time scheduling in wireless networks. This paper presents a Real-Time Bandwidth Allocation (RTBA) algorithm which considers the three factors by a weighting factor H for real-time traffic fairly in WCDMA. Because IP will potentially become a common network layer protocol over all radio access networks, the RTBA algorithm is designed mainly in IP layer. It also couples the packet scheduling in both IP and radio link layers to reduce overhead and possibly could achieve better performance for the whole system. To optimize the bandwidth allocation for good channels, we also propose simple and historical predictions for channel conditions in the function H. Simulation results show that the RTBA algorithm reduces the data dropping rate significantly when comparing to the Earliest Due Date (EDD) algorithm. The simple and historical prediction methods are also very close to the real wireless situation.

Original languageEnglish
Pages (from-to)2703-2707
Number of pages5
JournalIEEE Vehicular Technology Conference
Issue number4
StatePublished - 1 Dec 2004
Event2004 IEEE 60th Vehicular Technology Conference, VTC2004-Fall: Wireless Technologies for Global Security - Los Angeles, CA, United States
Duration: 26 Sep 200429 Sep 2004


  • All-IP wireless networks
  • Fair scheduling
  • QoS (Quality of Service)
  • Real-time packet scheduling

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