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Förslaget inkom 2007-05-13

WCDMA Uplink Enhancement with Time Division Multiplexing

Thesis Description:

The thesis project will consider how Time Division Multiplexing (TDM) can be used for improving the communication from mobile to base station in WCDMA, the so-called uplink. To do so, radio resource management algorithms and measures will be modelled in a Matlab-based radio network simulator.


The first step to a full-fledged mobile broadband infrastructure was taken with the launch of High Speed Downlink Packet Access (HSDPA). This improvement of the WCDMA downlink has given increased performance in terms of higher system throughput, higher user bit rates and faster response times. However, to provide an enhanced total mobile broadband experience for the user, uplink performance also needs to be improved.

What is often thought of as the uplink equivalent to HSDPA is called Enhanced UpLink (EUL). However, due to incomplete knowledge of the users’ transmission needs, it is hard for EUL to utilize the radio spectrum equally well as HSDPA. One major problem is interference caused by other users in the same cell, and with the advent of high bit rates, also users in surrounding cells. To take full advantage of the techniques for high bit rates, this interference must be kept to a minimum. One way of doing so is to introduce TDM between users and/or cells. This idea is encouraged by the strong gains given by TDM in HSDPA.

Problem Statement:

Even though EUL uses fast scheduling hosted by the base stations today, there is neither real separation between the actual transmission times of single users, nor co-ordination between different cells. The master thesis student will consider different schemes for implementing TDM between users and/or cells. As TDM for the uplink in WCDMA is still in its initial stages, both solutions conforming to the existing 3GPP specifications and solutions extending these specifications can be considered.

By means of computer simulations, the performance gain of the different schemes should be compared to each other as well as to what is available today. The evaluation may then be used in considering an approach for subsequent standardisation work and product development.


By e-mail in English with “MSc thesis project” in the subject line. Please include a list of courses with marks and a CV. Please also provide the names and contact details of two persons that may be contacted as references during the recruitment process. Applications close on May 11.

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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