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Presentation to Radiocommunications Agency 16 June 2000

BFWAtg(00)39. Presentation to Radiocommunications Agency 16 June 2000. Structure of the presentation. Scope and objectives of the study Interference analysis (worst case) Statistical modelling and analysis Conclusions and recommendations. Objective of the Study.

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Presentation to Radiocommunications Agency 16 June 2000

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  1. BFWAtg(00)39 Presentation to Radiocommunications Agency 16 June 2000

  2. Structure of the presentation • Scope and objectives of the study • Interference analysis (worst case) • Statistical modelling and analysis • Conclusions and recommendations

  3. Objective of the Study • To determine co-existence requirements for BWFA services sharing the same spectrum in adjacent geographic areas

  4. Scope • Identify the effect of modified interference criterion on co-ordination requirements • Interference limit 6dB below the noise floor • Identify the effect of applying different downtilts to PMP BSs on interference analysis • Identify the effect of different PMP cell sectorisation on interference analysis

  5. Approach taken • Determine the modified co-ordination distances from the worst case scenarios • Statistical modelling to determine the effect of antenna downtilting on interference analysis • Statistical modelling to determine the effect of cell sectorisation on interference analysis

  6. Interference Scenarios • PMP Base station to PMP base station • PMP Base station to subscriber station • Subscriber station to subscriber station • Subscriber station to PMP base station • Between very high density networks

  7. Base to Base Co-ordination: • For reference base station, PFD limit at the service area boundary should not exceed: • 95.5 dBW/MHz/m2 at 42 GHz • 99.5 dBW/MHz/m2 at 28 GHz • Co-ordination distance from boundary is: • 13.5 km at 42 GHz • 21 km at 28 GHz

  8. Subscriber station interference • With ATPC, LOS co-ordination distances from the service area boundary are: • 7.5 km at 42 GHz • 12.5 km at 28 GHz

  9. Interference from very high density networks • Co-ordination distances are smaller due to smaller cells and lower EIRPs • To minimise co-ordination of individual stations, operators should avoid co-channel, co-polar operation within 5 km of adjoining service area boundaries

  10. PMP BS antenna downtilt: 1 • Original analysis performed with downtilt equal to 9 degrees • In this study, the BS antenna downtilt was varied between 0 and 9 degrees • Monte Carlo statistical analysis conducted to determine the impact of different downtilts on interference environment

  11. PMP BS antenna downtilt: 2 • Results of the study show that: • Interference from multiple PMP BS interferers operating in adjacent geographic area will be within the desired limits providing the BS antenna downtilt is not less than 8 degrees • Note: using different antenna RPE may have an impact on the conclusions

  12. PMP cell sectorisation: 1 • Range of PMP cell sector widths modelled • 30°, 60°, 90° and 120° sectors investigated • Statistical analysis conducted • Tx power adjusted to maintain EIRP level • Antenna RPE and gain adjusted • Other parameters maintained at the same level

  13. PMP cell sectorisation: 2 • Statistical analysis has confirmed that: • There is a higher probability of suffering interference from PMP BS in adjacent geographic areas if wider sector cells are deployed • The highest probable interference levels for different sector widths deployed do not differ significantly

  14. PMP cell sectorisation: 3 • Providing the co-ordination requirements are satisfied, the interference levels experienced by adjacent geographic region BFWA station will be acceptable regardless of the PMP cell sector width deployed

  15. Conclusions: 1 • Co-ordination of individual stations required if boundary PFD exceeds: • -95.5 dBW/MHz/m2 at 42 GHz • - 99.5 dBW/MHz/m2 at 28 GHz • Typical Line of Sight co-ordination distances: • 13.5 km at 42 GHz (4.5 km smaller than for the original interference criteria) • 21 km at 28 GHz (6.5km smaller than for the original interference criteria)

  16. Conclusions: 2 • Typical subscriber LoS co-ordination distance, with ATPC: • 7.5 km at 42 GHz (2.5km smaller than for the original interference criteria) • 12.5 km at 28 GHz (3.5km smaller than for the original interference criteria) • Co-channel, co-polar operation should be avoided within 5 km of service boundary

  17. Conclusions: 3 • Monte Carlo analysis has concluded that co-ordination requirements are valid: • If elevated PMP BS antennas are downtilted by 8° or more (providing an antenna complying with ETSI EN 301 215 standards is used) • Regardless of the PMP cell sector width deployed in the range between 30° and 120°

  18. Aegis Systems Ltd Balfour House Churchfield Road Walton-on-Thames Surrey KT12 2TD Tel: 01932 237800 http://www.aegis-systems.co.uk

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