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Voice-over-IP for Mobile Broadband: Modelling and Performance Analysis
Starting Date: August-September 2006 (proposed)
Thesis Description: Voice-over-IP (VoIP) puts new challenges on WCDMA networks. Instead of large downloads without delay requirements that the packet-switched (PS) domain is typically optimised for, VoIP involves the frequent transmission of small, delay-sensitive packets. This thesis will examine the characteristics and radio resource management (RRM) mechanisms required in the WCDMA Radio Access Network to enable the efficient provision of a VoIP service in a range of different traffic scenarios. RRM functionality will be modelled in a Matlab-based radio network simulator and investigations aimed at optimizing VoIP capacity will be performed.
Background: Following the success of VoIP in the fixed network, e.g., SKYPE, the interest in offering such a service in mobile networks is large. Since voice telephony is a well-established and highly optimized service in the circuit-switched (CS) domain, the introduction of VoIP in an efficient way in the PS domain will include a number of challenges; in particular in the areas of speech quality, coverage and capacity. Solutions where VoIP is carried over High-Speed Packet Access technology (HSDPA and Enhanced Uplink) look encouraging, but to support the evolution of a robust and efficient VoIP solution, a number of considerations need to be taken if the basic RRM functionality (admission control, congestion control, power control, etc) is to be able to efficiently support the QoS demands of a conversational service.
Problem Statement: To date, no thorough quantification has been made of how different RRM features affect VoIP performance over HSDPA and EUL (i.e. mobile broadband in downlink and uplink). Such an evaluation is important to be able to promote and tune functions to reach a desired VoIP performance with minimum capacity and quality impact on other packet-switched services. By means of computer simulations and/or analytical techniques, the thesis student will derive performance data for VoIP in combination with a selected number of different RRM features and for traffic scenarios with a selected number of other services active. These performance data will then be used to recommend and outline details of RRM solutions for efficient VoIP transmission.
Application: By e-mail, including a list of courses with marks and a CV. Applications close on May 21.
Suitable Background: Electrical Engineering, Engineering Physics or Computer Engineering, 180 points or equivalent. Good marks are a plus. Advanced courses in control theory, signal processing, queuing theory and performance analysis are an advantage.
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