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On the Engineering Value of Spectrum in Dense Mobile Network Deployment Scenarios
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab). (wireless@kth)
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).ORCID iD: 0000-0002-7559-8911
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).ORCID iD: 0000-0001-7642-3067
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
2015 (English)Conference paper, Published paper (Refereed)
Abstract [en]

the continuing growth in the mobile data traffic magnifies the challenges for the design and deployment of scalable high-capacity mobile networks that can meet the future demand at reasonable cost levels. In order to meet the future traffic demand, an operator should invest on both infrastructure, i.e. densification of base stations, and more radio spectrum. Knowing the effectiveness of each element is thus of utmost importance for minimizing the investment cost. In this paper, we study the economic substitutability between spectrum and densification. For this, we measure the engineering value of spectrum, which refers to the potential saving in the total cost of ownership (TCO) as result of acquiring additional spectrum resources. Two countries are considered to represent different market situations: India with dense population and high spectrum price and Sweden with moderate population density and low spectrum fee. Numerical results indicate that additional amount of spectrum substantially relieves the need for densifying radio base stations, particularly for providing high user data rate in dense India. Nonetheless, the engineering value of spectrum is low in India (i.e. spectrum acquisition has less cost benefit) under the high spectrum price of today, whereas spectrum is instrumental in lowering the total cost of ownership in Sweden. Our finding highlights the importance of affordable and sufficient spectrum resources for future mobile broadband provisioning.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2015.
Series
IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)
Keyword [en]
economic value of spectrum, mobile broadband, MNO, Total Cost of ownership (TCO)
National Category
Telecommunications
Research subject
Information and Communication Technology
Identifiers
URN: urn:nbn:se:kth:diva-185912DOI: 10.1109/DySPAN.2015.7343922ISI: 000380544200042Scopus ID: 2-s2.0-84960403130OAI: oai:DiVA.org:kth-185912DiVA: diva2:924555
Conference
2015 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN),29 Sep - 02 Oct 2015,Stockholm, Sweden
Projects
METIS-II project
Funder
Wireless@kth
Note

QC 20160429

Available from: 2016-04-28 Created: 2016-04-28 Last updated: 2017-05-10Bibliographically approved
In thesis
1. A study on the deployment and cooperative operation of ultra-dense networks
Open this publication in new window or tab >>A study on the deployment and cooperative operation of ultra-dense networks
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The traffic volume in wireless communication has grown dramatically in the last decade and is predicted to keep increasing in the future. In this thesis, we focus on the densification dimension for capacity improvement, which has been proved to be the most effective in the past. The current gain of network densification mainly comes from cell splitting, thereby serving more user equipments (UEs) simultaneously. This trend will decelerate as base station (BS) density gets closer to or even surpass UE density which forms an ultra-dense network (UDN). Thus, it is crucial to understand the behavior of ultra-densification for future network provisioning.

 

We start from comparing the effectiveness of densification with spectrum expansion and multi-antenna systems. Our findings show that deploying more BSs provides a substantial gain in sparse network but the gain decreases progressively in a UDN. The diminishing gain appears in a UDN make us curious to know if there exists a terminal on the way of densification. Such uncertainty leads to the study on the asymptotic behavior of densification. We incorporate a sophisticated bounded dual-slope path loss model and practical UE densities in our analysis. By using stochastic geometry, we derive the expressions and prove the convergence of the coverage probability of a typical UE and network area spectral efficiency (ASE). Considering the large portion of dormant BSs in a UDN, it is an interesting question whether we can utilize these dormant BSs to improve system performance is an interesting question. To this end, we employ joint transmission (JT) techniques into a UDN. Two types of cooperation schemes are investigated: non-coherent JT and coherent JT depending on the availability of channel state information (CSI). Our results reveal that non-coherent JT is not beneficial in a UDN while coherent JT are able to increase UE spectral efficiency (SE) depending on the environmental parameters.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 41 p.
Series
TRITA-ICT, 03
National Category
Communication Systems
Research subject
Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-199892 (URN)978-91-7729-260-9 (ISBN)
Presentation
2017-02-17, Sal B, Electrum, Isafjordsgatan 26, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20170117

Available from: 2017-01-17 Created: 2017-01-17 Last updated: 2017-01-20Bibliographically approved
2. Towards Affordable Provisioning Strategies for Local Mobile Services in Dense Urban Areas: A Techno-economic Study
Open this publication in new window or tab >>Towards Affordable Provisioning Strategies for Local Mobile Services in Dense Urban Areas: A Techno-economic Study
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The future mobile communication networks are expected to cope with growing local usage patterns especially in dense urban areas at more affordable deployment and operation expenses. Beyond leveraging small cell architectures and advanced radio access technologies; more radio spectrum are expected to be required to achieve the desired techno-economic targets. Therefore, the research activity has been directed towards discussing the benefits and needs for more flexible and local spectrum authorization schemes. This thesis work is meant to be a contribution to this ongoing discussion from a techno-economic perspective.

 

In chapter three, the engineering value of the different flexible authorization options are evaluated from the perspective of established mobile network operators using the opportunity cost approach. The main results in chapter three indicate the economic incentives to deploy more small cells based on flexible spectrum authorization options are subject to the potential saving in the deployment and operation costs. Nonetheless; high engineering value can be anticipated when the density of small cells is equal or larger than the active mobile subscribers’ density.

 

While in chapter four, the possible local business models around different flexible authorization options are investigated from the perspective of emerging actors with limited or ’no’ licensed spectrum resources. In this context, dependent or independent local business can be identified according to surrounding spectrum regulations. On possible independent local business models for those emerging actors is to exploit the different flexible spectrum authorization options to provision tailored local mobile services. Other viable dependent local business models rest with the possibility to enter into different cooperation agreements to deploy and operate dedicated local mobile infrastructure on behalf established mobile network operators.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 61 p.
Series
TRITA-ICT, 2017:07
National Category
Telecommunications
Research subject
Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-206950 (URN)978-91-7729-319-4 (ISBN)
Presentation
2017-06-07, Sal C, Kistagången 16, Kista, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20170510

Available from: 2017-05-11 Created: 2017-05-10 Last updated: 2017-05-12Bibliographically approved

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