Intelligent MBWIMA/UMTS protocol using cascade fuzzy logic control for UTRA TDD mode
Chih-Yang Kao, Jeich Mar · IEEE Transactions on Vehicular Technology · 2003
An intelligent medium-access-control (MAC) protocol based on cascade fuzzy-logic-control (CFLC), consisting of a fuzzy V/sub max/ (maximum number of voice/video slots) control and a fuzzy data-rate control for universal mobile telecommunications system (UMTS) terrestrial radio access time-division duplex (UTRA TDD) mode is presented. Voice, data, and video are integrated for transmission using CFLC-based movable-boundary wireless multiple access (MBWIMA) in the UMTS protocol. The performance of the CFLC-based MBWIMA/UMTS protocol with data-rate control is optimized by using the CFLC to generate the proper maximum number of voice/video slots and a suitable data rate. Simulation results demonstrate that the data-packet delay for the CFLC-based MBWIMA/UMTS protocol with data-rate control is less than that for the CFLC-based MBWIMA/UMTS protocol without data-rate control. The CFLC-based MBWIMA/UMTS protocol with data-rate control can greatly improve both the voice-video dropping probability and the data-packet delay of the MBWIMA/UMTS and general packet-radio system/UMTS protocols at the expense of a small decrease in the data-packet throughput. Voice-activity detector, single cell, and multicell environments are also considered.