Weightless-P

工業物聯網(Industrial IoT, IIoT) : 

Weightless-P支援

• 所有主要免授權(License-Exempt) SRD/ISM頻帶，頻率範圍含括169、433、470到510、780、868、915以及923MHz，以確保全球皆能使用
• 該標準提供完全認可的雙向通訊，在資料速率200bps到100kbps間能提供最佳品質的服務。
• Weightless-P支援短至中的承載量(Payload Size)，針對上行鏈路主導的訊務，能實現較現有LPWAN及蜂巢式(Cellular)技術更高的容量。
• Weightless-P採用市場上普遍能取得的晶片組，同樣也能運用低功耗、創新換手(Handover)技術、重選基地台以及漫遊等功能，進一步支援基站及行動終端設備
• Weightless-P的傳輸範圍和可靠性皆優於其他LPWAN技術替代方案，最高輸出功率為17dBm。
• 此技術方案的價格與現有LPWAN相去不遠，且靜態平均功耗不到100µW，相較之下，目前最佳的蜂巢式技術平均功耗則超過3mW

The following data are copied by weightless official website.

Key characteristics

Excellent capacity and scalability for IoT deployment

• FDMA+TDMA in 12.5kHz narrow band channels offer optimal capacity for uplink-dominated traffic from a very large number of devices with moderate payload sizes
• Operates over the whole range of license-exempt sub-GHz ISM/SRD bands for global deployment: 169/433/470/780/868/915/923MHz
• Flexible channel assignment for frequency re-use in large-scale deployments
• Adaptive data rate from 200bps to 100kbps to optimise radio resource usage depending on device link quality
• Transmit power control for both downlink and uplink to reduce interference and maximize network capacity
• Time-synchronised base stations for efficient radio resource scheduling and utilisation

Bidirectional

• Supports both network-originated and device-originated traffic
• Paging capability
• Low latency in both uplink and downlink
• Fast network acquisition
• Forward Error Correction (FEC)
• Automatic Retransmission Request (ARQ)
• Adaptive Channel Coding (ACC)
• Handover
• Roaming
• Cell re-selection

Long range

• Lower data rates with channel coding provide similar link budget to other LPWAN technologies
• 2km in urban environment

Industrial-grade reliability

• Fully acknowledged communications
• Auto-retransmission upon failure
• Frequency and time synchronisation
• Supports narrowband channels (12.5KHz) with frequency hopping for robustness to multi-path and narrowband interference
• Channel coding
• Supports licensed spectrum operation

Ultra-low energy consumption

• GMSK and offset-QPSK modulation for optimal power amplifier efficiency
• Interference-immune offset-QPSK modulation using Spread Spectrum for improved link quality in busy radio environments
• Transmit power up to 17dBm to allow operation from coin cell batteries
• Adaptive transmit power and data rate to maximise battery-life
• Power consumption in idle state when stationary below 100uW

Secure and efficient networking

• Authentication to the network
• AES-128/256 encryption
• Radio resource management and scheduling across the overall network to ensure quality-of-service to all devices
• Support for over-the-air firmware upgrade and security key negotiation or replacement
• Fast network acquisition and frequency/time synchronisation

Low cost and complexity

• Using standard GMSK and offset-QPSK modulation channels ensures broad availability of hardware and no dependency on a single vendor
• Compared to UNB, narrowband operation is less sensitive to frequency offset and drift, allowing the use of lower cost, lower power XOs or DCXOs instead of TCXOs
• Maximal transmit power of 17dBm allows for integrated power amplifier

Open standard

• Brings the reliability and performance of cellular technologies at a fraction of the cost by avoiding any legacy or backward-compatibility concerns
• Ensures interoperability between the manufacturers
• Provides for multivendor support to stimulate ongoing innovation and minimise end user costs
• Royalty free IP minimises production costs

The Weightless-P Specification and demonstration hardware will be available later this year. Base stations, endpoints and development kits will be commercially available in Q1 2016.