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Dynamic Spectrum Load Balancing for Cognitive Radio in Frequency Domain and Time Domain
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  • Dynamic Spectrum Load Balancing for Cognitive Radio in Frequency Domain and Time Domain
  • Dynamic Spectrum Load Balancing for Cognitive Radio in Frequency Domain and Time Domain
저자명
손성환,김재명,Chen. Ju-An,Sohn. Sung-Hwan,Gu. Jun-Rong,Kim. Jae-Moung
간행물명
韓國ITS學會 論文誌
권/호정보
2009년|8권 3호|pp.71-82 (12 pages)
발행정보
한국ITS학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

As a solution to spectrum under-utilization problem, Cognitive radio (CR) introduces a dynamic spectrum access technology. In the area, one of the most important problems is how secondary users (SUs) should choose between the available channels, which means how to achieve load balancing between channels. We consider spectrum load balancing problem for CR system in frequency domain and especially in time domain. Our objective is to balance the load among the channels and balance the occupied time length of slots for a fixed channel dynamically in order to obtain a user-optimal solution. In frequency domain, we refer to Dynamic Noncooperative Scheme with Communication (DNCOOPC) used in distributed system and a distributed Dynamic Spectrum Load Balancing algorithm (DSLB) is formed based on DNCOOPC. In time domain, Spectrum Load Balancing method with QoS support is proposed based on Dynamic Feed Back theory and Hash Table (SLBDH). The performance of DSLB and SLBDH are evaluated. In frequency domain, DSLB is more efficient compared with existing Compare_And_Balance (CAB) algorithm and gets more throughput compared with Spectrum Load Balancing (SLB) algorithm. Also, DSLB is a fair scheme for all devices. In time domain, SLBDH is an efficient and precise solution compared with Spectrum Load Smoothing (SLS) method.