Performance enhancements of MBMS and VoIP services in WCDMA/HSPA networks

Aho, Kari Performance enhancements of MBMS and VoIP services in WCDMA/HSPA networks Jyväskylä: University of Jyväskylä, 2009, 96 p.(+included articles) (Jyväskylä Licentiate Theses in Computing ISSN 1795-9713; 13) ISBN 978-951-39-3687-7 Finnish summary The purpose of this thesis is to address the performance of Multimedia Broadcast Multicast Service (MBMS) and Voice over IP (VoIP) services in Wideband Code Division Multiple Access (WCDMA)/High Speed Packet Access (HSPA) networks. MBMS and VoIP services have already gained vast popularity in the fixed networks and thus it is very likely that they will also be key concepts in wireless cellular networks in the near future. However, from practical perspective, wireless network sets very strict environment for this kind of services. Thus, it is crucial to be able to evaluate the need of radio resources, possible enhancements and vast number of practical network parameters so that cellular network and these services operate in optimal manner in different situations. This kind of information can be then used by cellular operators in addition to network and product vendors in dimensioning and fine-tuning cellular networks. Special attention in this thesis will be paid on the mobility aspect of both of those services. Studies include the performance evaluation of MBMS with macro diversity combining with and without receive diversity. From the perspective of macro diversity soft and selective combining are evaluated. In addition, concept called Rx-switching is evaluated in order to provide some battery saving opportunities for MBMS terminals employing multiple receive antennas. On the area of VoIP this thesis addresses the performance both in uplink and downlink in terms of user velocity, handover parameters and delays. This kind of performance evaluation is critical as VoIP is very sensitive to any additional delays and/or packet losses that handover performance could potentially cause. This thesis evaluates the performance with help of fully dynamic system simulator where user mobility, fading, propagation and radio resource management functionalities are explicitly taken into account.

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