Secondary Cell Activation via Terminal Triggered Reference Signal
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Solution Overview
Problem
The existing communication methods for activating secondary cells in terminal devices suffer from significant delays due to the long period required for network devices to send reference signals, leading to inefficient use of bandwidth resources and poor user experience.
Innovation Solution
A communication method where a terminal device detects a secondary cell and sends indication information to the network device, triggering the network device to send a reference signal, thereby reducing the activation delay of the secondary cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the network device sends reference signals periodically with a long period (e.g., SSB with period >= 20ms), then the reference signal overhead is reduced, but the delay of activating the secondary cell increases
Solution Approach 1:
The terminal device performs secondary cell detection and sends indication information to the network device in advance, before the periodic reference signal arrives. This preliminary action triggers the network device to send the reference signal at an optimal time, reducing activation delay while maintaining reasonable reference signal overhead
Solution Approach 2:
The terminal device provides feedback to the network device by sending indication information after detecting the secondary cell. This feedback mechanism allows the network device to adjust its reference signal transmission timing based on the terminal's detection status, optimizing both activation speed and resource efficiency
2Loss of time
If the network device sends the reference signal early before the terminal device completes detection, then the activation delay is reduced, but reference signal overhead is wasted
Solution Approach 1:
The terminal device sends indication information to the network device after completing secondary cell detection, providing real-time feedback on detection status. This enables the network device to send the reference signal at the most appropriate moment, avoiding premature transmission and wasting of reference signal resources
Solution Approach 2:
The reference signal transmission timing is made dynamic rather than fixed. The network device adjusts the reference signal sending time based on the terminal's detection completion status, optimizing resource usage while minimizing activation delay
Data Source
AI summary
This application discloses a communication method and apparatus that activate a secondary cell. If the activated cell is an unknown secondary cell, in response to a terminal device detecting the secondary cell, the terminal device may send indication information to a network device. The indication information is used to trigger the network device to send an RS. In this way, in response to receiving the indication information, the network device may send the RS to the terminal device. Therefore, the terminal device avoids waiting a long period of time for the network device to send a reference signal, which can reduce a delay for activating the secondary cell.