Preprocessed Synchronization Signals for Low-Power Terminals
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Solution Overview
Problem
Terminal devices experience high time and power consumption overheads during synchronization when switching from a sleep state to an awake state due to the main receiver needing to synchronize with a network device after a long period of deep sleep.
Innovation Solution
A synchronization method involving a first module receiving a signal from a network device to wake up a second module and provide synchronization information, allowing the second module to quickly synchronize with the network device using indices and frequency information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main receiver switches from sleep state to awake state, then the terminal device can perform normal communication operations, but the synchronization process consumes excessive time and power
Solution Approach 1:
The network device pre-processes synchronization information and transmits it through the wake-up signal. The terminal device extracts synchronization parameters (time offset, frequency offset, cell ID) from the wake-up signal before the main receiver is activated, enabling the main receiver to skip the traditional lengthy synchronization process and directly enter communication operations.
2Reliability
If the main receiver switches from sleep state to awake state, then the terminal device can perform normal communication operations, but the synchronization process consumes excessive power
Solution Approach 1:
The network device pre-processes synchronization information and transmits it through the wake-up signal. The terminal device extracts synchronization parameters (time offset, frequency offset, cell ID) from the wake-up signal before the main receiver is activated, enabling the main receiver to skip the traditional lengthy synchronization process and directly enter communication operations.
3Use of energy by stationary object
If the terminal device uses a separate low-power wake-up receiver, then power consumption is reduced during idle state, but the main receiver requires extensive synchronization time when activated
Solution Approach 1:
The network device pre-processes synchronization information and transmits it through the wake-up signal. The terminal device extracts synchronization parameters (time offset, frequency offset, cell ID) from the wake-up signal before the main receiver is activated, enabling the main receiver to skip the traditional lengthy synchronization process and directly enter communication operations.
Solution Approach 2:
The wake-up signal serves as an intermediary carrier that transports synchronization information from the network device to the terminal device. This intermediary mechanism allows the low-power wake-up receiver to perform the function of synchronization information reception, bridging the gap between power-saving mode and full operation mode.
Data Source
AI summary
This application provides a synchronization method and a communication apparatus. The method may be applied to communication systems such as NR, LTE, and V2X. The method includes: A network device sends a first signal and first information to a first module of a terminal device, where the first signal can be used to wake up a second module of the terminal device, and the first information can be used for synchronization between the network device and the second module of the terminal device; and the second module receives the first information forwarded by the first module, and performs synchronization with the network device based on the first information. In this way, this application can reduce time overheads and power consumption overheads needed for synchronization when the second module switches from a sleep state to an awake state.