Cross-Technology Wireless Experimentation : improving 802. 11 and 802 Cross-Technology Wireless Experimentation : improving 802.11 and 802.15.4e coexistence SPEAKER:YEI-REI CHEN ADVIDOR: DR. HO-TING WU DATE: 2017/10/13

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

Introduction Time Slotted Channel Hopping (TSCH) is an emerging MAC protocol defined in the IEEE 802.15.4e standard, combining time slotted access with multi-channel and channel hopping capabilities. IEEE802.11(Wi-Fi) and IEEE802.15.4e(TSCH) in close proximity will inevitably lead to performance degradation du to interference.

TSCH The Time Slotted Channel Hopping (TSCH) protocol is one of the new MAC Behavior modes introduced by the IEEE 802.15.4e standard. Time slotted access Predictable and bounded latency, Guaranteed bandwidth Channel hopping mitigates the effects of interference and multipath fading, improves reliability

TSCH(Cont.) Time slotted access

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

Band interference 2.4G band

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

Band interference(Cont.) 802.15.4e & 802.11 b

Band interference(Cont.) 802.15.4e & 802.11(ch.1,6,11)

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

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

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

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

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

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

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

WiSHFUL(Cont.) Wireless MAC Processor (WMP) for IEEE802.11 radio Time-Annotated Instruction Set Computer (TAISC) for IEEE802.15.4e radio

WiSHFUL(Cont.)

Simulation Setting & Result 32 Contiki sensor nodes with 802.15.4 radio 14 Linux nodes with two 802.11 radios

Simulation Setting & Result(Cont.)

Simulation Setting & Result(Cont.)

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.

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 802.11 and 802.15.4e 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 802.15.4e 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. 116-123, October 2009

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