0000000000297486
AUTHOR
Janne Kurjenniemi
Performance Enhancement of Multimedia Broadcast Multicast Service (MBMS) with Receive Diversity
The aim of this paper is to evaluate the effect of receive diversity on multimedia broadcast multicast service (MBMS) performance in wideband code division multiple access (WCDMA) networks. In addition to time diversity provided by long interleaving and receive diversity provided by multiple receive antennas, 3GPP release 6 specifications for MBMS introduce two macro diversity schemes: soft and selective combining. Diversity techniques are introduced in order to improve the MBMS performance. Improvements help especially the cell edge MBMS users who suffer most from the fading channel conditions. As receive diversity is one of the most efficient diversity techniques this paper examines the s…
Cognitive self-healing system for future mobile networks
This paper introduces a framework and implementation of a cognitive self-healing system for fault detection and compensation in future mobile networks. Performance monitoring for failure identification is based on anomaly analysis, which is a combination of the nearest neighbor anomaly scoring and statistical profiling. Case-based reasoning algorithm is used for cognitive self-healing of the detected faulty cells. Validation environment is Long Term Evolution (LTE) mobile system simulated with Network Simulator 3 (ns-3) [1, 2]. Results demonstrate that cognitive approach is efficient for compensation of cell outages and is capable to improve network coverage. Anomaly analysis can be used fo…
Benchmarking of VoIP over HSDPA and LTE performance with realistic network data
The purpose of this paper is benchmark the performance of voice over IP in high speed downlink packet access and in long term evolution networks. Benchmarking is conducted in homogeneous and heterogeneous scenario layouts assuming realistic propagation data generated over Tokyo map. Tools used in this paper are two fully dynamic time driven system simulators which have been used to support 3GPP standardization work. This benchmarking study provides insights to what e.g. different radio access technologies, scheduling mechanisms and receivers do for the performance of voice over IP. This paper indicated in various scenarios that long term evolution can offer higher performance for voice over…
Non-regular network performance comparison between HSDPA and LTE
In this paper we study and benchmark the performance of 3rd Generation Partnership Project (3GPP) High Speed Downlink Packet Access (HSDPA) and 3GPP Long Term Evolution (LTE) Downlink with constant bit rate type traffic. In addition a non-regular simulation scenario is considered using realistic propagation data and base station positions related to Tokyo city downtown area. HSDPA was introduced in 3GPP Release 5 and in further releases the technology has been improved with e.g. receive and transmit diversity technologies and support for higher order modulation schemes. LTE was introduced in 3GPP Release 8 with completely new physical layer and improved Radio Resource Management (RRM) funct…
Handover and Uplink Power Control Performance in the 3.84 Mcps TDD mode of UTRA Network
In this article we consider the performance of the 3.84 Mcps time-division duplex (TDD) mode of UTRA (Universal Terrestrial Radio Access) network. We emphasize two of the radio resource management algorithms, handover and uplink power control, whose role in the overall system performance is studied extensively. First, a handover algorithm used in WCDMA (Wideband Code Division Multiple Access) standard is considered in a TDD-mode operation. This gives rise to a careful setting of different handover parameters, and the evaluation of the effects to the system performance. Secondly, the specified uplink power control algorithm is considered. Since it is based on several user-made measurements w…
A study of TD-CDMA and WCDMA radio network enhancements
Janne Kurjenniemen tutkimus käsittelee kolmannen sukupolven matkapuhelinjärjestelmien (TD-CDMA- ja WCDMA-järjestelmät) jatkokehittämistä ja järjestelmien suorituskyvyn arviointia simulointien avulla. Nykyaikaiset matkapuhelinjärjestelmät ovat laajoja kokonaisuuksia, jotka vaativat tarkat määrittelyt, jotta eri valmistajien laitteet toimisivat moitteettomasti yhdessä. Kurjenniemi määritti väitöstyössään järjestelmien vaatimuksia simulointien perusteella. Hän on mukana luomassa kolmannen sukupolven matkapuhelinjärjestelmien standardeja kansainvälisessä 3GPP-projektissa. Kurjenniemen tutkimuksessaan jatkokehittämää radioverkkosimulointityökalua voidaan käyttää tutkittaessa TD-CDMA- ja WCDMA -j…