Narrowband PPDU Synchronization for IoT Compatibility
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Solution Overview
Problem
Current IoT communication technologies, such as NB-IoT and LoRa, face challenges in providing synchronization adjustment and automatic gain control for narrowband data transmission, limiting their effectiveness in low-power, low-cost, and long-distance applications, and are not compatible with existing wireless local area networks.
Innovation Solution
A physical layer convergence procedure protocol data unit communication method that includes sending synchronization adjustment indication information and a data field in a bandwidth less than 20 MHz, enabling time synchronization and automatic gain control on IoT data, using a designed synchronization sequence based on legacy short training sequences to ensure compatibility and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NB-IoT is used for IoT communication, then wide coverage and low power consumption are achieved, but usage costs increase due to non-free spectrum
Solution Approach 1:
The patent introduces a synchronization sequence as an intermediary element that enables narrowband devices to perform time synchronization and automatic gain control. This mediator allows the device to operate efficiently in narrowband mode without requiring expensive broadband infrastructure, thus reducing usage costs while maintaining reliable communication through proper signal synchronization.
Solution Approach 2:
The patent changes the bandwidth parameter from broadband (20 MHz or more) to narrowband (less than 20 MHz) operation. By implementing synchronization mechanisms specifically designed for narrowband conditions, the system achieves cost-effective operation while maintaining reliable communication through adaptive parameter optimization for the narrowband environment.
2Use of energy by moving object
If LoRa is used for IoT communication, then free spectrum and low costs are achieved, but deployment complexity increases due to additional gateway requirements
Solution Approach 1:
The patent creates a universal synchronization mechanism that works across different bandwidth configurations and network types. The synchronization sequence can be used in both narrowband IoT and broadband WLAN environments, allowing a single design to serve multiple purposes and reducing the need for additional specialized components like separate gateways.
Solution Approach 2:
The patent merges the synchronization functionality into the existing physical layer convergence procedure protocol data unit structure. By combining time synchronization and automatic gain control functions within the standard PPDU framework, the system eliminates the need for separate gateway infrastructure, simplifying deployment while maintaining low-cost operation.
3Use of energy by stationary object
If narrowband transmission (less than 20 MHz) is used for IoT data, then low power and long distance are achieved, but synchronization adjustment and automatic gain control functions are not provided
Solution Approach 1:
The patent segments the PPDU structure to include a dedicated synchronization sequence portion. By separating the synchronization function from the data transmission and placing it in a distinct segment of the protocol structure, the system enables targeted synchronization processing without affecting the overall narrowband power-efficient transmission, thus providing reliable time and gain control.
Solution Approach 2:
The patent implements preliminary synchronization by placing the synchronization sequence at the beginning of the PPDU structure. This preliminary action allows the receiving device to perform time synchronization and automatic gain control before processing the actual data, ensuring reliable narrowband communication while maintaining low power consumption throughout the transmission.
Data Source
AI summary
This application provides a physical layer convergence procedure protocol data unit communication method and a related apparatus. The method includes: receiving, by a receiving apparatus, a physical layer convergence procedure protocol data unit PPDU sent by a sending apparatus, where the PPDU includes synchronization adjustment indication information and a data field, and the synchronization adjustment indication information and the data field are sent in a bandwidth less than 20 MHz; and performing, by the receiving apparatus, time synchronization and automatic gain control AGC on the data field based on the synchronization adjustment indication information. According to this solution, the receiving apparatus can perform, by using the synchronization adjustment indication information, time synchronization and automatic gain control AGC on the PPDU transmitted in a narrow bandwidth.