LoRaCloud: LoRa platform on OpenStack

So, Jae-Young; Kim, Dae-Hwan; Kim, Hongseok; Lee, Hyunseok; Park, Suwon

doi:10.1109/netsoft.2016.7502471

Cited by 24 publications

(11 citation statements)

References 2 publications

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“…A LoRa network server project is necessary to process the packets forwarded from/to LoRa Gateway. In [12], the authors proposed an implementation of LoRa network server on the OpenStack named as LoRaCloud without the performance evaluation. In addition, there are some projects available for building and managing LoRa network.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of Open LoRa for IoT

et al. 2019

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Long Range (LoRa) network is emerging as one of the most promising Low Power Wide Area (LPWA) networks, since it enables the energy-constraint devices distributed over wide areas to establish affordable connectivity. However, how to implement a cost-effective and flexible LoRa network is still an open challenge. This paper aims at exposing a feasible solution of design and implementation, allowing users to conveniently build a private LoRa network for various IoT applications. Firstly, several typical application scenarios of LoRa network are discussed. Then, the LoRa system architecture is presented with the functionality of each component. We address the hardware design and implementation of LoRa Gateway, which is the bridge between LoRa nodes and LoRa network server. Especially, the paper contributes by proposing an improved software architecture of LoRa network server whose source codes are open on GitHub. Under the architecture, LoRa network server is divided into four decoupled modules and uses the messaging system based on streaming data for the interaction between modules to guarantee scalability and flexibility. Finally, extensive experiments are conducted to evaluate the performance of LoRa networks in typical environments.Abstract-LoRa, LPWA, IoT, Microservice, Open Source

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Section: Introductionmentioning

confidence: 99%

Design and Implementation of Open LoRa for IoT

et al. 2019

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“…We assume that the transmitted symbols are m-QAM 7 . Considering a flat fading channel constant over the time slot and thatk devices are transmitting, the received signal at the N antennas of the BS over T channel uses in the rth time slot, Y r ∈C N×T , is given by [39] …”

Section: Signal Modelmentioning

confidence: 99%

“…5c). This is due to the fact that the additional repetitions provided by a fixed CP length allow the reducing of the PER (see (7)) and, hence, enhancing the system reliability, i.e., the probability of a successful transmission, as compared to NDMA and H-NDMA in which the repetitions are set mainly to resolve collisions. Differently, for γ =0 dB, the reliability with H-NDMA is also high because the HARQ mechanism starts to play a key role for successful packet reception (see Fig.…”

Section: Remarkmentioning

confidence: 99%

“…6 We assume that antenna precoding at the transmitter side entails additional complexity and energy consumption at the base band processing. 7 Note that LTE uses QPSK, 16-QAM, and 64-QAM [6], while NB-IoT does only support QPSK [11]. 8 If the channel was static and constant among time slots, then the fast-fading channel assumption could be achieved by ensuring that each terminal adds a different random phase for transmission in every time slot.…”

Section: Endnotesmentioning

confidence: 99%

“…They are indeed used in today's most advanced cellular networks (as the random access channel (RACH) in LTE) [6] and are being considered in different MTC systems, such as LoRa [7], SigFox, enhanced MTC [8], narrowband (NB) LTE-M [9,10], and NB-IoT [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of feedback-free collision resolution NDMA protocol

Lagén

Agustín

Vidal

et al. 2018

J Wireless Com Network

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To support communications of a large number of deployed devices while guaranteeing limited signaling load, low energy consumption, and high reliability, future cellular systems require efficient random access protocols. However, how to address the collision resolution at the receiver is still the main bottleneck of these protocols. The network-assisted diversity multiple access (NDMA) protocol solves the issue and attains the highest potential throughput at the cost of keeping devices active to acquire feedback and repeating transmissions until successful decoding. In contrast, another potential approach is the feedback-free NDMA (FF-NDMA) protocol, in which devices do repeat packets in a pre-defined number of consecutive time slots without waiting for feedback associated with repetitions. Here, we investigate the FF-NDMA protocol from a cellular network perspective in order to elucidate under what circumstances this scheme is more energy efficient than NDMA. We characterize analytically the FF-NDMA protocol along with the multipacket reception model and a finite Markov chain. Analytic expressions for throughput, delay, capture probability, energy, and energy efficiency are derived. Then, clues for system design are established according to the different trade-offs studied. Simulation results show that FF-NDMA is more energy efficient than classical NDMA and HARQ-NDMA at low signal-to-noise ratio (SNR) and at medium SNR when the load increases.

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