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Author:Hakola, Petri
Title:Macro Diversity Combining Optimization in HSPA flat architecture
Publication type:Master's thesis
Publication year:2009
Pages:vii + 73      Language:   eng
Department/School:Tietoliikenne- ja tietoverkkotekniikan laitos
Main subject:Tietoliikennetekniikka   (S-72)
Supervisor:Jäntti, Riku
Instructor:Kynäslahti, Ari
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201203071281
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark S80     | Archive
Keywords:UMTS
WCDMA
soft handover
macro diversity combining
Abstract (eng): This thesis, Macro Diversity Combining Optimization in High Speed Packet Access (HSPA) flat architecture, concentrates on analyzing implementation alternatives of Marco Diversity Combining (MDC) in fiat architecture.

When centralized elements, like Radio Network Controller (RNC), are removed from the architecture, centralized functionalities need to be implemented differently.
One of the most important centralized functionality is Macro Diversity Combining which collects traffic from multiple base stations and improves radio performance like bit rate and coverage area.
When this functionality is implemented inside base station traffic needs to be sent between base stations.
Traffic between base stations creates new requirements for transport network and potentially also increases operator transport cost.
In short, if MDC is fully implemented, traffic between base stations is maximized and opposite, if MDC is left out, radio performance is reduced.

The thesis starts with the overview introduction of Universal Mobile Telecommunication System (UMTS) network.
Here we discuss the architecture of the UMTS packets switched network, and the main functionalities of the Radio Resource Management (RRM): power control and handover control.

A deeper look is taken into evolution of 3GPP packet access namely High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Data Access (HSUPA) plus the relevant HSDPA cell change and HSUPA handovers are covered.
A short glance is also taken into the gains introduced by MDC.
In this thesis four proposals presented in 3GPP to improve the MDC with regards to utilization of transport network, implementation complexity, radio performance, latency and amount of additions to existing 3GPP specifications are evaluated.

Finally, an implementation alternative for MDC optimization in flat architecture is presented based on the proposals in 3GPP.
ED:2009-08-18
INSSI record number: 38130
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