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Co-existence of MP- MP and PMP Systems

Co-existence of MP- MP and PMP Systems. Philip Whitehead Radiant Networks PLC. Definition: The ability of two (or more) systems to operate in the presence of mutual interference with acceptable degradation of performance Two main scenarios

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Co-existence of MP- MP and PMP Systems

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  1. Co-existence of MP- MP and PMP Systems Philip Whitehead Radiant Networks PLC

  2. Definition: The ability of two (or more) systems to operate in the presence of mutual interference with acceptable degradation of performance Two main scenarios Systems operating on the same channels in adjacent or nearby areas. Systems operating in overlapping areas and using adjacent or near- adjacent channels. Coexistence

  3. No base stations Short paths All antennas are directional Low antenna heights Low transmitter power Very good frequency re-use Detect and avoid interference Improved co-existence General Characteristics of Mesh Systems

  4. Mesh and PMP systems can easily co-exist Guard bands can be reduced or even zero Co-channel systems can be very close together (closer than PMP – PMP) Rain fading has negligible impact Main conclusions from the study

  5. Simulation of (random) mesh with large number of subscribers 20GHz - 43.5GHz considered – results presented for 28GHz band Multiple interferers 3-D geometry Effects of buildings (LOS probability calculated) Atmospheric attenuation and rain fading according to ITU-R Methodology

  6. mesh X-dim mesh tot Y-dim Base Station Receiver cell radius 90 mesh boundary Mesh C L Geometry

  7. 3D Geometry hub Mesh rx sub Mesh tx

  8. Link Length Distribution

  9. Relative Power (dB) Bearing (degrees) Azimuth Elevation Horn Antenna RPE

  10. 28GHz Antenna RPE

  11. Main lobe Characteristics

  12. System Spacing vs. BS Antenna Height

  13. MP-MP to PMP Subscriber Co-channel

  14. Height above ground (m) Distance past BS from mesh (km) MP-MP to PMP Subscriber Co-channel (BS 12km from mesh edge)

  15. A mesh can be placed close to a PMP system, with negligible interference Spacing can be even less when the mesh uses “self adaptation” (down to zero?) Mesh antenna RPEs are not critical (low cost antennas can be used) Rain fading effects are negligible. Co-channel conclusions

  16. Mesh to PMP hub (50m elevation) dry weather, adjacentchannel

  17. Mesh to PMP hub (50m elevation) dry weather, adjacentchannel Mesh to PMP hub (50m elevation) dry weather, adjacentchannel

  18. Mesh to 50m PMP hub: uniformly wet weather, single-channel guard band

  19. Mesh to PMP hub (50m elevation) one guard channel

  20. Mesh to 25m PMP hub: uniformly wet weather, single-channel guard band

  21. Mesh to PMP subscriber, adjacent channel

  22. Mesh to PMP subscriber, adjacent channel

  23. Mesh to cell-edge PMP subscriber, single-channel guard band

  24. Guard band of zero to one channel is sufficient for a “random” mesh Self- adapting mesh can work with zero guard band Antenna RPEs not critical (low cost antennas possible) Rain fading effects are negligible Conclusions for Overlapping systems

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