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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Support For IP mobility and diversity in a broadband wireless access network

Shi, Xyiu January 2010 (has links)
Broadband wireless access (BWA) network working at millimetre bands possesses the advantages of quick deployment, more flexibility, wide service coverage and cost efficiency. The range of services to be provided via the system includes broadband digital television, Internet data, telephony and videoconference. Apart from broadcast digital television, all traffic is carried in Internetworking Protocol (IP) format. Unfortunately the services of such a system are susceptible to impairment by buildings, vegetation, terrain and attenuation caused by rain, snow and sleet, etc. Accordingly the service availability and system performance can drop dramatically. In the worst case, the system will experience heavy packet loss and the services might be completely unavailable. An extended multiprotocol label switching (MPLS) network architecture is proposed in this thesis, which allows fast mobile IP access and diversity routing for traffic under fade condition. This supports nomadic access, reduced packet loss and improved service availability in BWA network during system outage. Also developed herein is a Diversity and Shadow Flow Merging Mechanism, which, besides sending a packet on its normal path, also duplicates the packet and sends it on a separate, diverted labelled path. The shadow flow merging mechanism is responsible for merging the normal flow and shadow flow together and delivering the merged packet to its destination. It is anticipated that the packet can be successfully delivered to the destination even if one path fails completely during the system outage. The protocol is tested on a general BWA network that is configured with Digital Video Broadcast (DVB) downlink and Multi-Frequency Time Division Multiplex Access (MF-TDMA) uplink equipments. The protocol’s ability of reducing packet loss and improving service availability, during the period of link failure, is verified. It is concluded that the protocol is effective in improving the service availability of BWA network.
2

Improving traffic delivery in ad hoc network using temporal connectivity

Yang, Xiaonan January 2008 (has links)
An ad hoc mobile network is a collection of mobile nodes that are arbitrarily located without any available fixed infrastructure. In such networks, change in interconnections between nodes depends on the movement of mobile nodes. Each mobile node acts as a router and moves in a discretionary manner. Due to dynamic topological changes and the lack of a fixed infrastructure, the problem of how to improve connectivity to guarantee delivery of information is one of the biggest challenges of ad hoc networks. One possible solution is to increase the transmission range of mobile nodes until the connectivity requirement is achieved. But due to physical restrictions, this solution is not always feasible.
3

Service interaction management in a deregulated market environment

Kolberg, Mario January 2004 (has links)
No description available.
4

Multiple access techniques for emerging broadband wireless access networks

De Obaldía Lee, Galileo E. January 2003 (has links)
No description available.
5

Operational support systems for satellite communications

Fitch, Michael Robert January 2005 (has links)
No description available.
6

A secured hierarchical approach to autoconfiguration in mobile ad hoc networks

Fan, Qi January 2006 (has links)
No description available.
7

Mobile-agent based middleware for mobile users

Zaini, Norliza Mohamad January 2005 (has links)
No description available.
8

Adaptive equalisation for downlink UMTS terrestrial radio access

Hadef, Mahmoud January 2007 (has links)
No description available.
9

Minimum error rate beamforming transceivers

Tan, Shuang January 2008 (has links)
No description available.
10

TOA estimation using super-resolution algorithms in indoor environments

Zhao, Fang January 2007 (has links)
No description available.

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