DBTW Status Signaling for Fast Unlicensed-Band Synchronization
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Solution Overview
Problem
In communication systems operating on unlicensed bands, the Listen Before Talk (LBT) mechanism prevents base stations from sending synchronization signals at specified positions, leading to uncertainty in the status of the discovery burst transmission window (DBTW), which hinders timely timing synchronization between user equipment and network devices.
Innovation Solution
A communication method and apparatus that enables terminal devices to determine the status of the DBTW by receiving and processing first information from network devices, including a Q value or a first parameter, to identify whether synchronization signals are being blocked due to LBT failures, allowing for quick synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LBT mechanism is implemented on shared bands, then the base station can avoid transmitting during busy periods, but the terminal device cannot determine the DBTW status and cannot quickly implement timing synchronization
Solution Approach 1:
The network device performs preliminary action by indicating the DBTW status in advance through the Q value parameter before the terminal device needs to perform timing synchronization. This allows the terminal device to obtain the DBTW status information proactively, avoiding the time loss that would occur while waiting to determine the status. The Q value is configured to represent different DBTW states, enabling the terminal to quickly understand whether the DBTW is enabled or disabled without additional signaling delays.
2Reliability
If the base station does not send a specified SSB at a specified position due to LBT failure, then the LBT mechanism is maintained, but the terminal device cannot determine whether the DBTW is enabled or disabled
Solution Approach 1:
The Q value parameter serves as an intermediary that carries the DBTW status information from the network device to the terminal device. Instead of directly transmitting the status or requiring the terminal to infer it from SSB positions, the Q value acts as a mediator that encodes the DBTW enabled/disabled state. This intermediary mechanism allows the terminal to reliably determine the DBTW status without violating the LBT mechanism, as the information is conveyed through existing signaling channels rather than through SSB transmission patterns that would require LBT.
Data Source
AI summary
This application provides a communication method and apparatus. The method is applied to an unlicensed band, and includes: receiving first information sent by a network device, where the first information includes a Q value or a first parameter, and the first parameter indicates a status of a discovery burst transmission window DBTW; and determining the status of the DBTW based on the Q value or the first parameter. According to the solution provided in this application, a terminal device can determine the status of the DBTW, to quickly implement timing synchronization with the network device.