Cross-technology interference (CTI) from dense and prevalent wireless has become a primary threat to low-power IoT. This paper presents G-Bee, a CTI avoidance technique that uniquely places ZigBee packet on the guard band of ongoing WiFi traffic, which effectively safeguards the packet from WiFi interference. Such design ensures reliable ZigBee communication even under saturated WiFi traffic where traditional ZigBee is considered inoperable. Technical highlight is in lighweight WiFi guard band capture mechanism using ZigBee PHY layer samples directly accessible in various commercial ZigBee chip. Another exclusive feature of G-Bee is spectrum-synchronized low duty cycling – by utilizing guard bands of periodic WiFi beacons, active slots are effectively synchronized to spectrum availability (i.e., guard band) for significant delay improvement. Extensive evaluations on our prototype system demonstrates G-Bee PRR over 95% where legacy ZigBee drops to below 15% under significant interference with hundreds WiFi users and reduction of low duty cycle delay by 87.5%, all of which are achieved with a light computational overhead of 0.3%.
|Original language||English (US)|
|Title of host publication||SenSys 2018 - Proceedings of the 16th Conference on Embedded Networked Sensor Systems|
|Publisher||Association for Computing Machinery, Inc|
|Number of pages||13|
|State||Published - Nov 4 2018|
|Event||16th ACM Conference on Embedded Networked Sensor Systems, SENSYS 2018 - Shenzhen, China|
Duration: Nov 4 2018 → Nov 7 2018
|Name||SenSys 2018 - Proceedings of the 16th Conference on Embedded Networked Sensor Systems|
|Conference||16th ACM Conference on Embedded Networked Sensor Systems, SENSYS 2018|
|Period||11/4/18 → 11/7/18|
Bibliographical noteFunding Information:
This work was supported in part by the NSF under grant CNS-1717059. We sincerely thank the shepherd and reviewers for their valuable feedback and suggestions.
© 2018 Association for Computing Machinery.
- Cross-technology interference
- Guard band