Smart City Gnosys

Smart city article details

Title	Bsma: Scalable Lora Networks Using Full Duplex Gateways
ID_Doc	12930
Authors	Subbaraman R.; Guntupalli Y.; Jain S.; Kumar R.; Chintalapudi K.; Bharadia D.
Year	2022
Published	Proceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM
DOI	http://dx.doi.org/10.1145/3495243.3560544
Abstract	With its ability to communicate long distances, LoRa promises city-scale IoT deployments for smart city applications. This long-range, however, also increases contention as many thousands of devices are connected. Recently, CSMA has been proposed as a viable MAC for resolving contention in LoRa networks. In this paper, supported by measurements, we demonstrate that CSMA is ineffective in urban deployments. While gateways stationed at rooftops enjoy a long communication range, 70% of the devices placed at street level fail to sense each others' transmissions and remain hidden, owing to obstructions by tall structures. We present Busy Signal Multiple Access (BSMA), where the LoRa gateway transmits a downlink busy signal while receiving an uplink transmission. The IoT devices defer uplink transmissions while a busy signal is present. Practically viable BSMA requires a full-duplex LoRa gateway-i.e., a gateway that can simultaneously receive and transmit in the same channel. We develop the first full Duplex LoRa gateway in the 915 MHz ISM band, overcoming challenges that arise from a 9× greater delay spread and the need for 1000× greater self-interference cancellation. Our implementation works with COTS LoRa devices and improves network capacity by 100% compared to CSMA in bursty loads while being fair to all IoT devices near and far. © 2022 Owner/Author.
Author Keywords

Similar Articles

Id	Similarity	Authors	Title	Published
25084	0.915	El-Aasser M.; Badawi R.; Ashour M.; Elshabrawy T.	Examining Carrier Sense Multiple Access To Enhance Lora Iot Network Performance For Smart City Applications	IEEE International Conference on Consumer Electronics - Berlin, ICCE-Berlin, 2019-September (2019)
17542	0.89	Raffeck S.; Geißler S.; Hoßfeld T.	Dbm: Decentralized Burst Mitigation For Periodic Lora Devices Using Self-Organizing Radio Access	IEEE International Conference on Communications, 2023-May (2023)
19161	0.876	Tong S.; Wang J.	Designing, Building, And Characterizing Large-Scale Lora Networks For Smart City Applications	Proceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM (2023)
20583	0.873	Chimma C.; Phonphoem A.; Jansang A.; Tangtrongpairoj W.; Jaikaeo C.	Distributed Air-Time Reduction In Multi-Hop Lora Networks With Multiple Spreading Factors	2023 International Conference on Cyber Management and Engineering, CyMaEn 2023 (2023)
37209	0.871	Wang X.; Kong L.; He L.; Chen G.	Mlora: A Multi-Packet Reception Protocol In Lora Networks	Proceedings - International Conference on Network Protocols, ICNP, 2019-October (2019)
59872	0.869	Jörke, P; Böcker, S; Liedmann, F; Wietfeld, C	Urban Channel Models For Smart City Iot-Networks Based On Empirical Measurements Of Lora-Links At 433 And 868 Mhz	2017 IEEE 28TH ANNUAL INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR, AND MOBILE RADIO COMMUNICATIONS (PIMRC) (2017)
9130	0.865	Karthigaichelvi R.; Balakumar B.	Analysis Of Coverage In Lora Using Secured Iot Systems	E3S Web of Conferences, 399 (2023)
41786	0.863	Graha R.T.; Setiawan R.R.; Fakhrurroja H.; Meylani L.; Pramesti D.	Performance Evaluation Of The Dragino Dlos8N And Four-Faith F8L10Gw Lorawan Gateways In An Urban Scenario	2024 International Conference on Intelligent Cybernetics Technology and Applications, ICICyTA 2024 (2024)
53627	0.862	Abdeljabar S.; Alouini M.-S.	Super-Lora: Enhancing Lora Throughput Via Payload Superposition	IEEE Internet of Things Journal, 12, 14 (2025)
4970	0.859	Anzum R.; Habaebi M.H.; Islam M.R.; Hakim G.P.N.	A Study Of Lora Signal Propagation In Hilly Suburban Area For Smart City Applications	2021 IEEE 7th International Conference on Smart Instrumentation, Measurement and Applications, ICSIMA 2021 (2021)