1. Studies on 5 GHz extension bands for WAS/RLANs
ECC-US-CAN Liaison Meeting
Maisons Alfort , May 2015

2. Preparation for WRC-15 AI 1.1: main focus on the 5350-5470 MHz band
Background
Two workstreams
Preparation for WRC-15 AI 1.1: main focus on the MHz band
EC Mandate to CEPT
Harmonised compatibility and sharing conditions for WAS/RLANs in the and MHz.
Initial results in CEPT Report 57 (March 2015).
Final Report including complementary studies (March 16 for consultation, July 16 for publication).
Studies based on RLAN characteristics and assumptions (ETSI EN ).
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3. Studies in the band 5350-5470 MHz
Initial studies consistent with ITU-R (JTG ).
RLAN parameters derived from ECC/EC regulations in MHz (indoor only, e.i.r.p. limit 200 mW, TPC, DFS)
Sharing with EESS not feasible unless additional sharing/mitigation techniques are identified
Preliminary assessment of mitigation techniques not favorable
Additional studies on mitigation techniques started in April 2015
Compatibility with radiolocation (also applicable for MHz)
Further studies needed to ensure protection of radars not already covered (bi-static, fast frequency hopping)
May require enhancement of DFS or consideration of additional techniques.
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4. Studies in the band 5725-5925 MHz
RLAN parameters derived from ECC/EC regulations in MHz (outdoor allowed, e.i.r.p. limit 1 W, TPC, DFS)
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5. Studies in the band 5725-5925 MHz
Compatibility with FSS in / MHz
extensive studies are ongoing in 2 steps
step 1: determine the maximum number of RLAN active on-tune transmitters in the footprint of the satellites under consideration in order to satisfy the relevant protection criteria ΔT/T
step 2: compares the maximum number of active on-tune RLAN transmitters derived from step 1 to the expected RLAN deployments in order to assess the potential compatibility
main difficulty : develop a suitable deployment model for RLANs in the FSS footprint (may cover more than one continent)
Compatibility with BDA2GC in MHz
compatibility achieved with indoor RLANs
interference may occur for worst case scenarios involving outdoor RLANs
compatibility achieved with mitigating factors
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6. Studies in the band 5725-5925 MHz
Compatibility with ITS, BFWA, road tolling and Wireless Industrial Applications (WIA)
MCL calculations show the need for significant separation distances
Preliminary assessment of mitigation techniques (listen-before-talk)
Coexistence RLAN-ITS: consideration of coexistence mechanisms within the family (Clear Channel Assessment)
Coexistence RLAN-BFWA may be facilitated by the use of similar technology for both systems
Coexistence RLAN – road tolling: preliminary consideration of mitigation techniques (geolocation, beacon….)
Coexistence RLAN – WIA: can be achieved through coordination within the factory premises
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7. Further consideration
Further work on mitigation techniques for both bands performed in stage 2 (starting April 2015)
Cooperation with ETSI BRAN: new work items for mitigation techniques (EESS, radiolocation, ITS)
Initial discussions on LTE unlicensed:
Similar technology than WAS/RLAN – OFDM based
Assumptions regarding user density, indoor/outdoor usage, amount of traffic etc. may differ
LTE unlicensed equipment would have to apply the same mitigation techniques as WAS/RLANs equipment.
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8. Thanks for your attention
More information at
Thanks for your attention
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