1. CBP Success Probability
May 2008
doc.: IEEE yy/xxxxr0
May. 2008
CBP Success Probability
IEEE P Wireless RANs Date:
Authors:
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Cheng Shan, Samsung Electronics

2. May. 2008
Abstract
This contribution calculates the CBP packets’ coverage, as well as the probability that a CBP packet could successfully reach a neighboring cell
This contribution responses to the resolution of comment #406
Cheng Shan, Samsung Electronics

3. Basic Parameters May. 2008 CBP
Data Rate: 418bit/10ms=0.0418Mbps (8.4, [1])
Detection SNR Threshold: ~1dB for QPSK ½ rated 3-repitition
CPE
One directional WRAN antenna
G/T= dB as in [2]
Directional pattern as in section 8.12 of [1]
One Omni-directional sensing antenna
Type I: G/T= dB, as in [2]
Type II: G/T= dB, as in [3] BS
One Omni-directional WRAN antenna
G/T= dB, as in [2]
Propagation Model
F(50,90)
Cheng Shan, Samsung Electronics

4. CBP Sensitivities for Different Antenna Types
May. 2008
CBP Sensitivities for Different Antenna Types
CPE
CPE WRAN Antenna at direction with max gain: 25.2 dB (μV/m)
Sensing Antenna Type I: 24.9 dB (μV/m)
Sensing Antenna Type II: 41 dB (μV/m) BS
BS WRAN Antenna: 21.6 dB (μV/m)
Cheng Shan, Samsung Electronics

5. May. 2008
Max. Propagation Distance: CPE-to-CPE w/ WRAN Antenna for CBP Reception
Cheng Shan, Samsung Electronics

6. May. 2008
Max. Propagation Distance: CPE-to-CPE w/ Sensing Antenna Type I for CBP Reception
Cheng Shan, Samsung Electronics

7. May. 2008
Max. Propagation Distance: CPE-to-CPE w/ Sensing Antenna Type II for CBP Reception
Cheng Shan, Samsung Electronics

8. Max. Propagation Distance: BS-to-CPE w/ WRAN Antenna for CBP Reception
May. 2008
Max. Propagation Distance: BS-to-CPE w/ WRAN Antenna for CBP Reception
Cheng Shan, Samsung Electronics

9. May. 2008
Max. Propagation Distance: BS-to-CPE w/ Sensing Antenna Type I for CBP Reception
Cheng Shan, Samsung Electronics

10. May. 2008
Max. Propagation Distance: BS-to-CPE w/ Sensing Antenna Type II for CBP Reception
Cheng Shan, Samsung Electronics

11. Max. Propagation Distance: BS-to-BS
May. 2008
Max. Propagation Distance: BS-to-BS
Cheng Shan, Samsung Electronics

12. Short Summary May. 2008 CPE-to-CPE CBP Transmission
CBP packets could not reach far with WRAN antenna or sensing antenna Type II for reception;
Reception with sensing antenna Type I improves the performance;
BS-to-CPE
With WRAN antenna or sensing antenna Type II for reception, the BS transmitted CBP cannot reach out its own cell;
With sensing antenna Type II for reception, the BS transmitted CBP can reach into its neighboring cell;
BS-to-BS
BS can always receive CBP packets transmitted by its neighbor BS, given enough buffer time propagation;
Cheng Shan, Samsung Electronics

13. May. 2008
Simulation
The following simulations illustrate how likely two neighboring cells could exchange CBP (or, there is at least one CBP path existing, either CPE-to-CPE, BS-to-CPE, or BS-to-BS) in a practical scenario;
Cheng Shan, Samsung Electronics

14. May. 2008
Simulation Setups
Random active CPEs are dropped into the area of two neighboring cells according to a certain density
Each CPE points its WRAN antenna to its associated BS
BS association
Rule 1: a CPE in overlap area randomly chooses a BS for association
There are chances for face-to-face CPE-to-CPE CBP transmission
Rule 2: a CPE chooses the nearer BS for association
Always back-to-back CPE-to-CPE CBP transmission
Cheng Shan, Samsung Electronics

15. May. 2008
A Snapshot
Cheng Shan, Samsung Electronics

16. May. 2008
4W BS
Cheng Shan, Samsung Electronics

17. May. 2008
100W BS
Cheng Shan, Samsung Electronics

18. May. 2008
Conclusion
CPE-to-CPE CBP transmission is not reliable, large density of operating CPEs is needed to assure good chances of CBP exchange via CPEs
An sensing antenna with better sensitivity (Type I) may help a lot in CBP detection
BS-to-BS CBP transmission is reliable
Propagation delay must be investigated
Cheng Shan, Samsung Electronics

19. Improvement Options for CBP Detection
May. 2008
Improvement Options for CBP Detection
Rely more on BS-to-BS transmission;
The SCW buffer time needs to be carefully designed;
Using sensing antenna type I and rely more on BS-to-CPE transmission;
Buffer time also needs to be considered;
Set up CBP-bridge CPEs at the cell edge which could associate to multiple BSs simultaneously;
TG2 issue?
Cheng Shan, Samsung Electronics

20. References [1] IEEE 802.22 DRAFT v1.0
May. 2008
References
[1] IEEE DRAFT v1.0
[2] _WRAN_Reference_Model
[3] _Sensing_Thresholds
Cheng Shan, Samsung Electronics