BFWAtg Guard Bands 28GHz

1
BFWAtg - Guard Bands 28GHz

• Draft 26GHz Recommendation
• Two FDD systems
• At least one 28MHz slot or single polarisation
  only in adjacent slots.
• Two TDD or TDD/FDD mix
• Two 28MHz slots required.
• Or
• No guard bands but edge slots and mutual
  co-operation.

BFWAtg(00)20
2
BFWAtg-Guard Bands 28GHz

• TM4 Work Item DETR/TM04069
• Two TDMA/FDD systems, 28MHz channels
• No guard band with site sharing
• No guard band with near site sharing but better
  NFD required.
• One 28MHz guard channel required for
  unco-ordinated deployment.
• Contd.

3
BFWAtg-Guard Bands 28GHz

• TM4 Work Item DETR/TM04069
• One TDMA/FDD and one FDMA system, 28MHz channels
• One guard channel with site sharing.
• One guard channel with near site sharing.
• Two 28MHz guard channels required for
  unco-ordinated deployment.

4
BFWAtg-Guard Bands 28GHz

• RA/Aegis Study
• Two systems with similar characteristics
• One guard channel required.
• Two dissimilar systems (i.e.different
  channelisation).
• One guard channel in each assignment, but mutual
  co-operation and co-ordination may allow some use.

5
Summary

• Guard channel 0
• Mutual co-operation reqd including site
  sharing/near site sharing, tighter NFDs needed.
• Guard Channel 1
• Unco-ordinated deployment, dissimilar multiple
  access, similar FDD systems.
• Guard channels 2
• Unco-ordinated dissimilar multiple access, TDD or
  TDD/FDD mix

6
Summary

• Therefore for maximum protection and greatest
  freedom for deployment, 2 guard channels would
  seem appropriate.
• For greatest spectrum use Edge Bands /
  co-operation zones seem appropriate but
  co-operation must take place.
• Could depend on the size of assignments.