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Under such constraints it is difficult to provide service guarantees, which is quite paradoxical when devices are deployed for surveillance systems. The approach we propose allows devices to go \u201cexceptionally\u201d beyond the activity time limitation by borrowing time from other devices. The mechanism is not intended to be used on a regular basis, where a device is commissioned to always report data at a rate that makes it consuming more than the allowed duty-cycle limitation, but to offer a \u201clast chance\u201d solution for providing better surveillance service guarantees while globally satisfying duty-cycle regulations. The proposition has been implemented on our long-range image sensor platform, and preliminary experiments show that it can maintain the system\u2019s consistency and keep the number of control messages small while being capable of handling sleep-wakeup behavior and dynamic insertion of new devices. Although initially targeted for image sensors, the proposition can also be deployed to increase the quality of service of traditional sensors by guaranteeing that important messages can be sent despite the duty-cycle regulation limit.<\/jats:p>","DOI":"10.1145\/2979678","type":"journal-article","created":{"date-parts":[[2016,9,22]],"date-time":"2016-09-22T17:55:52Z","timestamp":1474566952000},"page":"1-31","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":19,"title":["QoS for Long-Range Wireless Sensors Under Duty-Cycle Regulations with Shared Activity Time Usage"],"prefix":"10.1145","volume":"12","author":[{"given":"Congduc","family":"Pham","sequence":"first","affiliation":[{"name":"University of Pau, Pau, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2016,9,22]]},"reference":[{"unstructured":"LoRa Alliance. 2015. LoRaWAN Specification v1.0. (2015).  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