The Journal of The Korea Institute of Intelligent Transport Systems (한국ITS학회 논문지)

The Korea Institute of Intelligent Transport Systems (한국ITS학회)
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An Efficient Inter-Cell Interference Mitigation Scheme for Proximity Service in Cellular Networks

셀룰러 망에서 Proximity Service를 위한 효율적인 셀 간 간섭 완화 방안

  • Kim, Cha-Ju (Dept. of Electronics & Communications Eng., Univ. of Kangwoon) ;
  • Min, Sang-Won (Dept. of Electronics & Communications Eng., Univ. of Kangwoon)
  • 김차주 (광운대학교 전자통신공학과) ;
  • 민상원 (광운대학교 전자통신공학과)
  • Received : 2017.12.05
  • Accepted : 2018.02.14
  • Published : 2018.02.28
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Abstract

The Proximity Service, which is one of the most popular network capacity improvement methods, uses the frequency reuse in order to increase the frequency efficiency. As a result, inter-cell interference between cellular and proximity service users occurs at a cell edge. In this paper, we proposed a mitigation scheme for inter-cell interference, where we suggested a new function of and eNB with ProSe function exchanging information about ProSe parameters and ProSe user equipment with neighboring cells via the X2 interface. As the first step, the resource which did not cause the inter-cell interference problem were pre-allocated through the frequency sensing in the ProSe direct discovery. As the next step, the inter-cell interference problem was solved by reallocating appropriate resources based on the ProSe application code, the ProSe application QoS, the ProSe application ID and validity timer in ProSe direct communication.

네트워크 수요량 향상 방안 중 가장 주목받고 있는 Proximity Service는 주파수 사용의 효율성 증대를 위해 대부분 주파수 재사용 방식을 사용한다. 그 결과 셀 edge에서 셀룰러 사용자의 Proximity Service 사용자의 셀 간 간섭 문제가 발생한다. 본 논문에서는 eNB에 Proximity Function의 기능과 파라미터를 새롭게 정의하고, ProSe 파라미터와 ProSe user equipment에 대한 정보를 X2 인터페이스를 통해 인접 셀과 교환하게 함으로써 셀 간섭 완화 방안을 제안한다. 우선 ProSe 탐색 과정에서 주파수 센싱을 통해 셀 간 간섭 문제를 일으키지 않을 자원을 할당한다. 그리고 ProSe 통신 상황에서는 ProSe application code, ProSe application QoS, ProSe application ID의 validity timer를 기반으로 간섭을 일으키지 않을 적합한 자원을 재 할당함으로써 셀 간 간섭 문제를 해결한다.

Keywords

References

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