WRC 2007 Agenda Items for WP 4-9S

Frequency sharing, between the fixed-satellite service and the fixed service

The list below shows all the WRC 2007 Agenda Items for which this is the lead group. Click on an Agenda Item or Resolution to get more information about which Visualyse product to use and how Transfinite consultants could assist in studying this problem.

Agenda Item	Description
Agenda 1.8	This agenda item relates to continuing the development of the regulatory framework for High Altitude Platform Stations (HAPS). Firstly in the bands 47.2 - 47.5 and 47.9 - 48.2 GHz: i) to encourage administrations to facilitate coordination between HAPS systems and co-primary satellite services, provisionally using Article 9 as a basis for procedures; ii) to study power limits for HAPS ground stations to facilitate sharing with space station receivers; iii) to study the regulatory provisions that might be needed to address the issue of a HAPS deployment in one administration effecting another; iv) other issues relating to sharing with radio astronomy and GSO FSS; Secondly in the bands 27.5 - 28.35 (HAPS to ground) and 31 - 31.3 (ground to HAPS) GHz, where HAPS shall not cause harmful interference to, nor claim protection from stations of other services: v) to conduct studies including sharing with fixed service to identify a suitable and preferably common 300 MHz of the 27.5 - 28.35 GHz; vi) to develop the necessary Recommendations on technical sharing criteria or HAPS system design conditions that are necessary to ensure HAPs can operate successfully on a non-harmful interference, non protected basis; vii) studies of the interference criteria and methodology for evaluating interference between HAPS downlinks and GSO FSS Uplinks; viii) to study the regulatory provisions that might be needed to address the issue of a HAPS deployment in one adminstration effecting another; ix) studies relating to mitigation techniques for HAPS sharing with the fixed service;
Agenda 1.18	This agenda item relates to sharing between FSS systems using highly inclined orbits and the fixed service in the 17.7 - 19.7 GHz bands. To facilitate sharing, PFD limits are defined in Article 21, but it has not been determined whether these values are adequate for such non-GSO systems with apogees greater than 18 000 km and orbital inclination between 35 and 135 degrees. It is therefore necessary to study: i) whether the current pfd limits would protect the fixed service, without unduly constraining development of these non-GSO FSS systems; ii) whether there are technical and operational measures that could be implemented in the fixed service to mitigate interference from these satellite systems.
Resolution 74	This resolution covers the need for studies to keep up to date the method in Appendix 7 used in the coordination of earth stations.
Resolution 143 [COM5/6]	This resolution relates to the development of high density applications in the fixed satellite service (HDFSS). A number of frequency bands have been identified in 5.BC03 as potentially suitable, and the Resolution gives guidelines as to ways to implement HDFSS - for example harmonisation of global spectrum. Particular areas that could benefit from further work are: a) development of simplified coordination procedures to facilitate the rapid introduction of HD-FSS terminals; b) study into the potential impact of the deployment of HDFSS in the upper part of the 48.2 - 50.2 GHz band on the satellite passive bands in the adjacent 50.2 - 50.4 GHz band, noting that 5.340 states that these passive services should not impose undue constraints on such services as the HDFSS