Sharing in the band 5 250-5 350 MHz between the Earth exploration-satellite service (active) and wireless access systems (including radio local area networks) in the mobile service
Introduction This Annex presents the results of three sharing analyses for the band 5 250-5 350 MHz between the spaceborne active sensors and the high speed WLANs@ or RLANs. The first study@ given in ?? of this Annex@ uses high performance RLAN (HIPERLAN) type 1 classes B and C and HIPERLAN type 2 characteristics for the RLANs and uses SAR4 characteristics for the SAR. In this study@ it is feasible for the indoor only HIPERLAN type 1 class B and HIPERLAN type 2 to share the 5 250- 5 350 MHz band with SAR4@ but is not feasible for the HIPERLAN type 1 class C to share the band@ nor for any HIPERLAN type designed to be operated outdoors with the technical characteristics assumed in the study. The second study@ as given in ?? of this Annex@ uses three RLAN types@ RLAN1@ RLAN2@ and RLAN3@ and uses SAR2@ SAR3@ and SAR4 characteristics for the SARs. In this study@ for the single transmitter deployed outdoors@ the RLAN1 high speed WLAN transmitter interference was above the acceptable level for SAR4@ the RLAN2 high speed WLAN transmitter interference was above the acceptable levels for both SAR3 and SAR4@ and the RLAN3 high speed WLAN transmitter interference was above the acceptable level for SAR4. For indoors/outdoors RLAN deployment@ it is feasible for the RLAN1@ based on an assumption of only 12 active transmitters per km2 within the SAR (footprint) and a single frequency channel for the RLAN1@ to share with SAR2@ SAR3@ and SAR4@ but it is not feasible for the RLAN2@ based on an assumption of 1 200 active transmitters per office space and 14 channels across a 330 MHz band@ to share with SAR2@ SAR3@ and SAR4. For an indoor deployment and considering the interference from the RLAN3 configuration of high speed WLANs to the SARs@ the analysis shows that any surface density less than 37-305 transmitters/km2/channel will yield acceptable interference levels into the SAR@ depending on the imaging SAR pixel S/N for an imaging SAR. The anticipated mean density is estimated to 1 200 transmitter/large office area and 250 transmitters/industrial area. The anticipated high density assumes 14 channels@ each 23.6 MHz wide@ over a 330 MHz band. For interference from the RLAN3 configuration of high speed WLANs to the SARs@ the analysis shows that only for a surface density less than 518 to 4 270 transmitters/km2 over 14 channels@ will local area networks (LANs) yield acceptable interference levels into the SAR. For RLAN3 interference into SAR2 and SAR4@ this would correspond to about 3 to 12 large office buildings or 15 to 60 industrial areas within the SAR footprint@ depending on the SAR pixel S/N. The third study@ as given in ?? of this Annex@ uses the more critical HIPERLAN type 1 characteristics for the RLANs and uses the altimeter characteristics as given in Table 2 for the altimeter. The radar altimeter operation with a 320 MHz bandwidth around 5.3 GHz is compatible with HIPERLANs. The fourth study@ as given in ?? of this Annex@ uses the HIPERLAN type 2 characteristics for the RLANs and uses the scatterometer characteristics as given in Table 3 for the scatterometer. The scatterometer operation around 5.3 GHz is compatible with HIPERLANs operated indoors.