Secondary Cell Activation Timing Control in 5G NR Terminals
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Solution Overview
Problem
Current radio communication systems, particularly in the context of 5G New Radio (NR), face challenges in efficiently activating secondary cells (SCells) without exceeding requested delay times, especially when updating timing advances and considering factors like transmission occasions and subcarrier spacing.
Innovation Solution
A terminal and radio communication system that includes a control unit for activating a specific secondary cell with a physical uplink control channel, ensuring activation does not exceed a requested delay time, with the delay time determined by the transmission occasion and subcarrier spacing of the secondary cell, and transmitting beam information when specific conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal activates a secondary cell with physical uplink control channel by updating timing advance, then the secondary cell activation is achieved, but the activation time may exceed the requested delay time
Solution Approach 1:
The terminal performs preliminary actions by determining the requested delay time based on the transmission occasion of random access preamble and subcarrier spacing before actually executing the timing advance update. This allows the terminal to prepare and execute the activation process efficiently within the predetermined time limit, preventing excessive delay while ensuring reliable activation.
2Reliability
If the terminal transmits beam information during secondary cell activation, then the communication quality is improved, but the activation process becomes more complex
Solution Approach 1:
The terminal applies local quality by transmitting beam information selectively only when specific conditions are satisfied during the activation process, rather than always transmitting it. This conditional approach improves communication quality when needed while avoiding unnecessary complexity during standard activation procedures.
Data Source
AI summary
A terminal comprises: a control unit that performs an activation of a specific secondary cell configured with a physical uplink control channel; and a transmission unit that transmits beam information related to the specific secondary cell when a specific condition is satisfied in the activation of the specific secondary cell.