Secondary Cell Activation Timing in NR Systems
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Solution Overview
Problem
The existing LTE system's fixed 8 ms timing for secondary cell activation or deactivation is not applicable to the flexible configuration of the new radio (NR) system, leading to waste of time resources due to inflexible data scheduling.
Innovation Solution
A method and apparatus that determine the timing for secondary cell activation or deactivation based on frame structure parameters, such as subcarrier spacing and cyclic prefix, allowing for flexible determination of the time required, thereby avoiding the fixed 8 ms constraint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed 8 ms timing is used for secondary cell activation or deactivation as in LTE system, then the control timing is simple and standardized, but it causes waste of time resources and is not adaptable to flexible scheduling in NR system
Solution Approach 1:
The patent applies dynamics by making the secondary cell control timing flexible rather than fixed. The timing is dynamically adjusted based on frame structure parameters such as subcarrier spacing and cyclic prefix type, allowing the system to adapt to different NR configurations and service requirements while avoiding time resource waste from rigid fixed timing
Solution Approach 2:
The patent changes the timing parameter from a fixed value (8 ms in LTE) to a variable determined by frame structure parameters. Specifically, the timing is calculated based on subcarrier spacing (15 kHz, 30 kHz, 60 kHz, etc.) and cyclic prefix type (normal or extended), enabling adaptation to different NR system configurations
2Productivity
If a fixed 8 ms timing is used for secondary cell control, then the system complexity is low with simple timing rules, but it reduces productivity and efficiency in flexible NR scheduling
Solution Approach 1:
The patent improves productivity by changing the timing parameter from fixed to variable based on frame structure parameters. This allows the system to optimize scheduling efficiency for different service types (e.g., eMBB, URLLC) by adjusting timing according to subcarrier spacing and cyclic prefix configurations
Solution Approach 2:
The patent applies local quality by providing different timing values for different frame structure configurations. Instead of a universal fixed timing, the system uses locally optimized timing based on specific subcarrier spacing and cyclic prefix combinations, improving overall system efficiency
Data Source
AI summary
This application provides a secondary cell control method and an apparatus. The method includes: A terminal device receives control information in a time unit n, where the control information may include an activation command for a first secondary cell or a deactivation command for a first secondary cell. When the control information includes the activation command for the first secondary cell, first information of the first secondary cell is sent in a time unit n+k, where k is determined based on a first frame structure parameter configured for the terminal device, and both n and k are positive integers. The first information may be a CSI report.