1. Cross-Technology Wireless Experimentation : improving 802. 11 and 802
Cross-Technology Wireless Experimentation : improving and e coexistence
SPEAKER:YEI-REI CHEN
ADVIDOR: DR. HO-TING WU
DATE: 2017/10/13

2. Outline Introduction TSCH Band interference
Cross-technology interference mitigation
WiSHFUL
Simulation Setting & Result
Conclusion
Reference

3. Introduction
Time Slotted Channel Hopping (TSCH) is an emerging MAC protocol defined in the IEEE e standard, combining time slotted access with multi-channel and channel hopping capabilities.
IEEE802.11(Wi-Fi) and IEEE e(TSCH) in close proximity will inevitably lead to performance degradation du to interference.

4. TSCH
The Time Slotted Channel Hopping (TSCH) protocol is one of the new MAC Behavior modes introduced by the IEEE e standard.
Time slotted access
Predictable and bounded latency, Guaranteed bandwidth
Channel hopping
mitigates the effects of interference and multipath fading, improves reliability

5. TSCH(Cont.)
Time slotted access

6. TSCH(Cont.) Channel hopping 𝑓: physical channel
ASN: absolute slot number
𝑛 𝑐ℎ : number of channels
chof-channeloffset

7. Band interference
2.4G band

8. Band interference(Cont.)
802.11b/g/n

9. Band interference(Cont.)
e & b

10. Band interference(Cont.)
e & (ch.1,6,11)

11. Cross-technology interference mitigation
In this paper ,we propose two strategy
Blacklisting
Cross-Technology TDMA schedule

12. Cross-technology interference mitigation(Cont.)
Blacklisting
exclude the spectrum used by the Wi-Fi network from being used in the hopping scheme applied by TSCH

13. Cross-technology interference mitigation(Cont.)
Default FHS generation

14. Cross-technology interference mitigation(Cont.)
Time-Random Channel Selection

15. Cross-technology interference mitigation(Cont.)
Generating FHSs From a Single Original Sequence

16. Cross-technology interference mitigation(Cont.)
Cross-Technology TDMA schedule
Both are synchronized
TSCH node detect the Wi-Fi beacon using CCA(Clear Channel Assessment)

17. WiSHFUL CP-control program UPI-Unified Programming interfaces
MCE-monitoring and configuration engine

18. WiSHFUL(Cont.) Wireless MAC Processor (WMP) for IEEE802.11 radio
Time-Annotated Instruction Set Computer (TAISC) for IEEE e radio

19. WiSHFUL(Cont.)

20. Simulation Setting & Result
32 Contiki sensor nodes with radio
14 Linux nodes with two radios

21. Simulation Setting & Result(Cont.)

22. Simulation Setting & Result(Cont.)

23. Conclusion
Cross technology interference mitigation techniques have been implemented in order to minimize coexistence issue.
Two Strategy have been implemented and presented that clearly exhibit the ability of the WiSHFUL architecture.

24. Reference
Peter Ruckebusch; Jan Bauwens; Bart Jooris;Spilios Giannoulis; Eli De Poorter;Ingrid Moerman; Domenico Garlisi; Pierluigi Gallo; Ilenia Tinnirello,” Cross-Technology Wireless Experimentation: improving and e coexistence” in World of Wireless, Mobile and Multimedia Networks (WoWMoM), 2016 IEEE 17th International Symposium on A,June 2016
Chao-Fang Shih; Ariton E. Xhafa; Jianwei Zhou,” Practical frequency hopping sequence design for interference avoidance in e TSCH networks”, Communications (ICC), 2015 IEEE International Conference on, June 2015
Watteyne, T., Mehta, A., and K. Pister, "Reliability Through Frequency Diversity: Why Channel Hopping Makes Sense", Proceedings of the 6th ACM Symposium on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous Networks (PE-WASUN), pp , October 2009

25. Thank you for listening.