3rd International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications

Research Article

Dynamic Spectrum Access Techniques TPC-resilient Initial Access in Open Spectrum Bands

  • @INPROCEEDINGS{10.1109/CROWNCOM.2008.4562489,
        author={Moonwon Lee and Gwangzeen Ko and Sunmin Lim and Myungsun Song and Changjoo Kim},
        title={Dynamic Spectrum Access Techniques TPC-resilient Initial Access in Open Spectrum Bands},
        proceedings={3rd International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications},
        publisher={IEEE},
        proceedings_a={CROWNCOM},
        year={2008},
        month={7},
        keywords={dynamic spectrum access; coexistence; transmission power control; probe; spectral sensing; cognitive radio; OFDMA},
        doi={10.1109/CROWNCOM.2008.4562489}
    }
    
  • Moonwon Lee
    Gwangzeen Ko
    Sunmin Lim
    Myungsun Song
    Changjoo Kim
    Year: 2008
    Dynamic Spectrum Access Techniques TPC-resilient Initial Access in Open Spectrum Bands
    CROWNCOM
    IEEE
    DOI: 10.1109/CROWNCOM.2008.4562489
Moonwon Lee1, Gwangzeen Ko2, Sunmin Lim2, Myungsun Song2, Changjoo Kim2
  • 1: 1Cognitive Radio Research Team Electronics and Telecommunications Research Institute, Daejeon Korea2Department of Broadband Network Engineering Korea University of Science and Technology, Daejeon Korea
  • 2: 1Cognitive Radio Research Team Electronics and Telecommunications Research Institute, Daejeon Korea

Abstract

Fast frequency channel saturation is one of big challenges in open spectrum bands. System designers may easily come up with TPC (Transmission Power Control) applied to the down-streams of a network, to increase the cell reuse factor, but this scheme alone is likely to encounter initial access issues where beacons are not either receivable or decodable inside the network’s maximum transmission range. Such problems can be handled in two major approaches; First, relaying beacons in a distributed manner to statistically sweep out hidden areas. Second, explicit demand of beacons from a connecting device. The latter is called active scan (or sending probes) and can guarantee successful connections to the network if, and only if, appropriate mechanisms are provided to avoid interference to neighboring networks. In that context, we will explore a wide span of DSA (Dynamic Spectrum Access) techniques and introduce a system, called DPA (Discrete Probe Access)-OFDMA, where probe frames are transmitted with orthogonality maintained in the power and code domain. A group of cognitive techniques to boost the efficiency of active scans will be presented too.