1. A Summary of Inter-WRAN Coexistence Schemes
Month Year
doc.: IEEE yy/xxxxr0
March 2008
A Summary of Inter-WRAN Coexistence Schemes
IEEE P Wireless RANs Date:
Authors:
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Wendong Hu, STMicroelectronics
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
March 2008
Abstract
This document presents a summary of the Inter-WRAN coexistence schemes in IEEE
Wendong Hu, STMicroelectronics
John Doe, Some Company

3. March 2008
Overview
Wendong Hu, STMicroelectronics

4. March 2008
Spectrum
Etiquette
Wendong Hu, STMicroelectronics

5. March 2008
Spectrum Etiquette
Wendong Hu, STMicroelectronics

6. March 2008
Analytical results
The rise over noise is increased in order of fixed frequency planning < Spectrum Etiquette < randomly frequency planning.
As the number of available channels, Spectrum Etiquette provides the significant gain on interference level than randomly frequency planning.
Wendong Hu, STMicroelectronics

7. Interference-free Scheduling
Month Year
doc.: IEEE yy/xxxxr0
March 2008
Interference-free Scheduling
BS A is operational and CPE A1 transmits CBP packets
BS B and CPE B1 starts operating and B1 receives CBP packets from A1
CPEs A1 and B1 reports to their BSs, this enables:
Network discovery
Spectrum etiquette
If no other channel is available, the BSs can use interference-free scheduling (BS B changes its schedule to CPE B1 to avoid interfering with CPE A1)
If interference-free scheduling is not effective (e.g. not enough resources)
BSs may go the next self-coexistence step: resource sharing (renting/offering, spectrum contention)
CPE B1
CPE A1
BS A
BS B
CPEs in the overlapping area would suffer from interference if no co-existence mechanism is in place.
Wendong Hu, STMicroelectronics
John Doe, Some Company

8. Practical considerations for Interference-free scheduling
Month Year
doc.: IEEE yy/xxxxr0
March 2008
Practical considerations for Interference-free scheduling
Downstream/upstream bandwidth allocations made by a BS to CPEs in coexistence areas should not change for a certain period of time
The BS should try to use the same allocation (time and frequency) for a CPE in the overlapping area
This guarantees that the information carried in CBP packets is valid for at least a minimum duration, thus allowing enough time to the recipients of the CBP packets to implement self-interference mitigation mechanism
The BS should try to maintain a stable bandwidth allocation schedule, at least for those CPEs in the overlapping area
Trade-off: the more dynamic the allocations, the higher the overhead (more inter-cell communication) to implement interference mitigation mechanisms
Wendong Hu, STMicroelectronics
John Doe, Some Company

9. Set RS bit in RS-ADV IE in SCH
March 2008
Dynamic Resource Renting/Offering
Set RS bit in RS-ADV IE in SCH
Offorer Procedure
Returning
Collecting
Wendong Hu, STMicroelectronics

10. Renter Procedure March 2008 Collecting Returning
Wendong Hu, STMicroelectronics

11. On Demand Spectrum Contention
March 2008
On Demand Spectrum Contention
AODCC – a Distributed, Cooperative, and Real-time spectrum sharing protocol
Coexisting networks exchange spectrum access priority numbers via MAC messaging.
Random number between [0, 2^32-1], for intra-operator operation
Credit tokens, for inter-operator operation
The winner, with higher access priority compared to that of the losers, will occupy the spectrum.
Wendong Hu, STMicroelectronics

12. On-Demand Spectrum Contention – Message Flow
March 2008
On-Demand Spectrum Contention – Message Flow
Wendong Hu, STMicroelectronics

13. March 2008
Simulation results
Wendong Hu, STMicroelectronics

14. Fairness and Convergence Time
March 2008
Fairness and Convergence Time
Wendong Hu, STMicroelectronics