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

摘要: 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 a network, increase cell reuse factor, but this scheme alone likely encounter initial access issues where beacons are not either receivable or decodable inside network's maximum transmission range. Such problems can be handled two major approaches: first, relaying distributed manner statistically sweep out hidden areas; and second, explicit demand from connecting device. The latter called active scan (or sending probes) guarantee successful connections network if, only appropriate mechanisms provided avoid interference neighboring networks. In that context, we will explore wide span DSA (dynamic access) techniques introduce system, DPA (discrete probe access)-OFDMA, frames transmitted orthogonality maintained code domain. A group cognitive boost efficiency scans presented too.