IST-4-027756 WINNER II D6.13.12 v1.0 Final CG “local area ...

WINNER II D6.13.12 v1.0The WINNER system with its dynamic spectrum management features will be considered as a steptowards a cognitive radio network. WINNER system captures some aspects of cognitive radio networks,where base stations and radio network are capable of determining the available spectrum resources fromother negotiating parties.Figure 12.1 introduces several functional components to enable the different spectrum functions asdepicted in Table 12.1.Table 12.1: Illustration of the interactivity between the spectrum sharing and spectrum assignmentfunctions in the WINNER conceptSpectrum Sharing and Coexistence (SSC)Spectrum sharing functionsThis group includes:• Vertical Sharing 1 (VS 1 ).• Vertical Sharing 2 (VS 2 ).• Horizontal Sharing with Coordination(HwC).• Horizontal Sharing without Coordination(HwoC).Flexible Spectrum Use (FSU)Spectrum assignment functionsThis group includes:• Long Term Assignment (LT).• Short Term Assignment (ST)The main functions needed for Spectrum Sharing and Coexistence are:• Vertical Sharing 1 (VS 1 ): WINNER system has the access to the spectrum and it may assist asecondary system by sharing its spectrum resources (primary or not) when they are not needed.Vertical Sharing 2 (VS 2 ): If WINNER system has a secondary access to the spectrum, it has toimplement mechanisms not to interfere with the primary system. For that purpose, considerableknowledge about the deployed primary system may be required.• Horizontal Sharing with Coordination (HwC): WINNER and other system (i.e. other IMT-Advanced system RATs) have the same priority in access spectrum, and they coordinate theirspectrum access based on a set of predefined rules (SSC rules) that all the involved systems aresubmitted to.• Horizontal Sharing without Coordination (HwoC): Unlike the previous case, there are nopossibilities of coordination (e.g. in license exempt RLAN bands within 5GHz). Each systemneeds to come up with its own methods of sensing of spectrum holes or spectrum opportunity.The main functions needed for Flexible Spectrum Use are:• Long Term Spectrum Assignment: The function coordinates and negotiates the spectrumassignments between multiple WINNER RANs for large geographical areas (this functionresides inside a GW). It takes into account the average traffic demand and predictions. Thespectrum assignments are updated periodically at a slow rate, i.e. in time frame of several tens ofminutes and above.• Short Term Spectrum Assignment: On the other hand, the ST spectrum assignment functioncontrols the short-term and local, i.e. cell-specific, variations of the large-scale spectrumassignments. Hence, it enables faster adaptation to the local traffic load variations andgeographically more accurate spectrum assignments than the LT assignment. The assignmentsare performed in the time scale of several super-frames, i.e. 100 ms to several minutes. The STassignment requests spectrum resources from other RANs after being triggered by the LTassignment or by preventive load control.Page 76 (86)