• Journal of Information Technology Applications and Management
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• 제21권4_spc호
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• pp.449-462
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• 2014

As mobile traffic is growing, the demand for spectrum is increasing but the deficiency of spectrum becomes serious as the supply is restricted essentially. For resolving the issue, spectrum sharing system is discussed from the technical and regulatory point of view, where multiple radio users occupy same frequency. In this paper, the policies and adoptions of spectrum sharing system in some countries are analyzed with a focus on TV white space and licensed shared access, which are based on unlicensed and licensed spectrum usage respectively. Some legal and regulatory plans to adopt and activate spectrum sharing in the Radio Waves Act system of Korea are proposed as well.

• 한국전자파학회논문지
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• 제25권8호
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• pp.821-827
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• 2014

최근의 주파수 부족현상을 해결하면서 간섭 없이 스펙트럼을 효율적으로 사용하는 주파수 공동 사용에 대한 연구가 많이 이루어지고 있다. 또한, 이와 더불어 급증하는 모바일 데이터 수요에 대처하기 위한 주요 스펙트럼 정책으로서 ASA/LSA(Authorized Shared Access/Licensed Shared Access) 개념을 많은 나라에서 도입하고 있는데, 이는 모바일 트래픽 증가를 해결하기 위한 스몰셀(small cell) 기술을 적용하는데 가장 적합한 스펙트럼 액세스 모델이다. ASA/LSA 주파수로 3.5 GHz 대역이 고려되고 있는 바, 본 논문에서는 가능한 ASA/LSA 대역을 발굴하고, 나아가 면허 없는 대역을 확장하기 위해 국내 3~4 GHz 대역에 대한 SAM(Spectrum Access Model)을 제안하고, 그 결과는 향후 스몰셀 수용 및 개방 주파수 확보를 위한 SAM을 개발하는데 필요한 데이터를 제공하게 될 것이다.

• 디지털산업정보학회논문지
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• 제12권4호
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• pp.81-87
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• 2016

Recently, as the heterogeneous network (HetNet) has been deployed widely to support various kinds of Radio Access Networks(RANs) with a combination of Macro, Pico, and/or Femto cells, research and standardization efforts have been very active regarding the concept of Licensed Shared Access (LSA) for supporting spectrum sharing. In order for a mobile device to efficiently support the spectrum sharing, the mobile device shall be reconfigurable, meaning that its radio application code has to be adaptively changed in accordance with the hopping of desired spectral band. Especially, Working Group 2 (WG2) of Technical Committee (TC) Reconfigurable Radio System (RRS) of European Telecommunications Standards Institute (ETSI) has been a main driving force for developing standard architecture for Multi-mode Mobile Device (MD) that can be applied to the LSA system. In this paper, we introduce the Multi-mode MD architecture for supporting LSA-based spectrum sharing. An implementation of a test-bed of Multi-mode MD is presented in order to verify the feasibility of the standard MD architecture for the purpose of LSA-based spectrum sharing through various experimental tests.

• 전자통신동향분석
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• 제33권3호
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• pp.1-10
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• 2018

This article presents spectrum sharing policy trends both overseas and domestically. The Federal Communications Commission recently adopted rules for the commercial use of a 150 MHz bandwidth at 3.55 to 3.7 GHz, which has been utilized for defense and satellite services. This frequency band for spectrum sharing is called the citizens broadband radio service (CBRS) band. In Europe, the related regimes for licensed shared access application at 2.3 to 2.4 GHz has been organized, and interface standardization for sharing frequency information has been completed. In Korea, efforts are being made to establish spectrum-sharing policies to improve the efficiency of the frequency utilization. This article also introduces both the IEEE 802 local area network/metropolitan area network and 3GPP standardization activities with regard to frequency sharing technologies. To effectively solve the spectrum-sharing problem in IEEE 802, standardization activities on the CBRS and the mid-band (3.7-24 GHz) are underway. 3GPP is currently developing the standardization of a licensed assisted access technology, which extends mobile communication services provided in the licensed band to unlicensed bands.

• Journal of Communications and Networks
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• 제16권2호
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• pp.202-208
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• 2014

Wireless network information services allow end systems to discover heterogeneous networks and spectrum available for secondary use at or near their current location, helping them to cope with increasing traffic and finite spectrum resources. We propose a unified architecture that allows end systems to find nearby base stations that are using either licensed, shared or unlicensed spectrum across multiple network operators. Our study evaluates the performance and scalability of spatial databases storing base station coverage area geometries. The measurement results indicate that the current spatial databases perform well even when the number of coverage areas is very large. A single logical spatial database would likely be able to satisfy the query load for a large national cellular network. We also observe that coarse geographic divisions can significantly improve query performance.

• 한국전자파학회논문지
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• 제25권10호
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• pp.1005-1019
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• 2014

본 논문은 미국 및 유럽을 중심으로 활발하게 진행되고 있는 주파수 공동사용에 대한 정책추진 현황 및 경제성 분석 결과, 이를 통한 주파수 공동사용의 후보 대역 선정 방안에 대해 제안하였다. 이를 위해 현재의 주파수 수요 급증에 대응하기 위해 시행되고 있는 주파수 할당 및 재배치 방법에 대한 추진현황과 문제점을 고찰하였으며, 이에 대한 해결방안으로 선진국을 중심으로 추진되고 있는 주파수 공동사용의 개념 및 국외 정책추진 현황, 사업자 관점에서의 주파수 공동사용에 대한 경제성 분석 결과를 소개하였다. 또한, 조사 및 분석결과를 통하여 주파수 공동사용의 후보 대역 선정을 위한 평가항목 및 선정기준에 대해 제안하였다.