Performance evaluation of Dynamic Block Error target selection based on traffic types in High Speed Uplink Packet Access
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Sähkötekniikan korkeakoulu |
Master's thesis
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Authors
Date
2014-12-15
Department
Major/Subject
Radio Communications
Mcode
S3019
Degree programme
TLT - Master’s Programme in Communications Engineering
Language
en
Pages
53+10
Series
Abstract
In today’s internet oriented world, the growth in mobile or cellular data traffic is enormous and the trend is going to continue for years to come. From past few years, the uplink data traffic has been of much importance because of the rise in social networking, video-conferencing, web-browsing etc. Therefore, uplink cell capacity and user experience are the major factors that the operators need to focus on. In uplink, users are not orthogonal to each other. Therefore, it results in interference when multiple users transmit simultaneously. That means to say, in uplink, shared resource is the amount of interference within the cell. Power control is a very important aspect in uplink to control the transmission power of UE’s and thus the resulting interference. In High Speed Uplink Packet Access (HSUPA), a feature called ‘Dynamic Block error rate target selection’ is introduced to control the uplink interference. This feature distinguishes the users into different traffic types based on their bit rate, frame rate and block error rate. Depending on the traffic types, different ideal BLER (Block error rate) targets are used to calculate the power with which the UE has to transmit in the next transmission period so as to introduce minimum interference. This thesis is focused on studying the ‘Dynamic BLER’ feature and then implementing different outer loop power control algorithms related to the feature. Simulations are done for various scenarios (low traffic, moderate traffic, high traffic) within the cell and the gain achieved in terms of cell throughput from this feature is verified through results for all the scenarios.Description
Supervisor
Jäntti, RikuThesis advisor
Philippe, RuaKeywords
block error target, signal to interference ratio, outer loop power control, radio resource management, uplink interference, HSUPA