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PhD. Dissertation


Throughput, Mobility, Energy, and Cost Tradeoffs inWireless Personal Area Network


As wireless networking technologies invade the environment, many wired connec- tion services are now being replaced by wireless equivalents. Wireless Personal Area Network (PAN) is a network consisted of several kinds of personal devices which are usually battery powered and whose computation power is limited. PAN is needed to re- duce power consumption and compensate computation power, whereas Wireless LAN concentrates on high throughput and long communication range. Bluetooth, Zigbee, and Ultrawideband (UWB) are proposed for wireless PAN. Four performance metrics, throughput, mobility, energy, and cost are issued for Wireless PAN. Throughput increase supports higher bandwidth communication. Mo- bility support is for seamless services to users. Energy reduction is designed to reduce the energy of PAN devices and give them more running time. Cost reduction is de- signed to reduce the real cost of accessing the Internet. This thesis is focus on the four performance metric issues in the PAN scenarios. Both simulation and testbed exper- iments are performed for evaluation. This thesis aims to develop better solution for supporting higher throughput, higher mobility support, less energy consumption, and less cost usage. Adaptive ARQ timeout is designed for high throughput and low delay support for audio streaming packets in Bluetooth network. Shorter connection length flows in- crease average throughput and enhance power consumption efficiency in Blueotooth scatternet. By using scatternet optimization methods, connection length is reduced therefore throughput and power consumption efficiency are increased. Overlaid Blue- tooth Piconet (OBP) and Temporary Scatternet (TS) form temporary interconnection of Bluetooth piconet and increase throughput and efficiency compared to those of scat- ternet. BlueTorrent is cooperative content sharing application to form temporary peer- to-peer connection and it increases throughput compared to commercial Access Point (AP) to mobile Bluetooth users. Several ZigBee interconnection methods (PAN merge, PAN bridge, and Mesh network) are proposed and compared for HealthNet scenario. These approaches are proposed to increase throughput, to support high mobility, to decrease energy, and to decrease cost of downloading data. There is no perfect solution to support all of these performance enhancements. By using tradeoff among these enhancements, we can find out better solution for specific scenario.

Paper: PDF file of paper

Information & Date

University of California, Los Angeles, Los Angeles, CA, June. 2007


Sewook Jung