LongFi updates are usually over the air (OTA) updates. Paired public and private keys are used with encrypted data transmissions. LongFi has multilayer security and uses asymmetric or public key cryptography. The specific modulation is a variant of the Chirp Spread Spectrum (CSS) technique used by LoRa where information is encoded using frequency modulated wideband pulses known as chirps, to encode the information that will be transmitted. Like LoRa, LongFi uses spread spectrum modulation which conserves battery life and bandwidth. This enables higher downlink throughput and extends the battery life of transmitting devices. LongFi uses forward error correction as it's signal processing technique. IoT devices can send data and receive commands over LongFi. Larger data packets can be broken up into smaller ones for transmission, preserving energy and bandwidth. LongFi data rate and packet sizeĭata packets sent via LongFi are usually between 5 and 20 kbits per second. LongFi connectivity preserves battery life which often can exceed one year without the need to recharge. Helium LongFi is designed to support battery-powered, sensor-based devices that may signal intermittently. Depending on the terrain, LongFi signals can travel between 1 and 10 miles (1.6 and 16 kilometers). Sub-gigahertz radio frequency signals are capable of traveling long distances with significant penetration of vegetation or buildings. These frequency bands are designated as Industrial Scientific and Medical ( ISM ) bands and are free to use meaning that LongFi can be deployed at a lower cost than cellular networking which uses the licensed spectrum. Helium LongFi uses sub-gigahertz unlicensed frequency bands, the same band that are used for LoRa networking. Technical specifications of Helium LongFi LongFi Frequency Bands Helium is soon to deploy a 5G version of their network Helium 5G which operates in a more lightly licensed (and therefore cheaper) frequency band known as the Citizens Broadband Radio Service (CBRS). However, cellular IoT networks use licensed portions of the radio spectrum which is expensive. LongFi vs 5GĥG cellular networking has some decentralised networks that operate similarly to Helium /LongFi and can compete on coverage. LongFi vs Bluetooth Low Energyīluetooth is a technology for Personal Area Networking (PAN) and though it can be used to create mesh networks it is unable to compete with the transmission range and coverage of LongFi for supporting IoT devices. Though LongFi and LoRaWAN both support long-range low-power networking, LoRaWAN is purely a wireless networking technology, whereas LongFi combines LoRaWAN with the Helium blockchain. It does not consume as much bandwidth as WiFi as the amount of information transferred in individual transmissions is low. LongFi massively exceeds conventional WiFi and Bluetooth in range and low energy consumption. Directional antennas with good line of sight can increase the range of WiFi to several kilometers. Long-range WiFi is the use of directional antennas to set-up long distance point-to-point WiFi connections and wireless bridges. LongFi is not an 802.11 protocol and is completely distinct from WiFi. LongFi is designed to handle sensor based data like environmental data, the location or position of objects, or telemetry data from machines or devices. LongFi can therefore be used to enable compatible devices to transfer data to the Helium network and for the coverage provided by hotspots to be validated. Authentication, security and remuneration for network services is provided by the Helium blockchain making LongFi essentially a combination of a LorRaWAN and Helium blockchain. In particular, LongFi networking enables large numbers of IoT devices to connect to individual hotspots or gateways and for hotspots to interact with each other. The LongFi brand differentiates itself from the LoRaWAN foundation on which Helium networking is based. LongFi is a proprietary name for the wireless networking protocol used by The Helium in its deployment of a decentralized peer-to-peer network for the Internet of Things (IoT).
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