Terminal Cell Activation Control for Short TTI Latency
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Solution Overview
Problem
Existing LTE systems face challenges in controlling communication when using shortened transmission time intervals (TTIs) shorter than 1 ms, particularly in activating and deactivating secondary cells, which is crucial for reducing latency and improving communication efficiency in future radio communication systems like 5G.
Innovation Solution
A user terminal equipped with a receiving section and a control section that manages activation and deactivation of cells based on the TTI duration, allowing for proper operation even with shortened TTIs, by receiving activation and deactivation commands and controlling the operation period accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If shortened TTIs (shorter than 1 ms) are used to reduce latency, then communication speed is improved, but the complexity of controlling activation and deactivation of cells increases
Solution Approach 1:
The patent changes the parameter of TTI duration from the standard 1 ms to shorter durations (e.g., 0.5 ms or less) to reduce latency. This parameter change enables faster communication but requires adjusting the operation period for cell activation/deactivation to match the shorter TTI, thereby resolving the contradiction between speed improvement and control complexity.
2Device complexity
If the operation period for cell activation and deactivation is extended to match standard 1 ms TTIs, then control is simplified, but latency increases
Solution Approach 1:
The patent makes the operation period for cell activation and deactivation dynamic by adjusting it to match the actual TTI duration being used. Instead of a fixed 1 ms operation period, the system dynamically sets the operation period to the shorter TTI duration (e.g., 0.5 ms), thereby reducing latency while maintaining appropriate control complexity for the current operating conditions.
3Ease of operation
If standard 1 ms TTIs are used for cell activation/deactivation control, then ease of operation is maintained, but communication efficiency is reduced
Solution Approach 1:
The patent changes the TTI duration parameter to shorter values (0.5 ms or less) to improve communication efficiency and productivity. By synchronizing the operation period with this parameter change, the system achieves faster communication cycles while maintaining operational simplicity through automated parameter alignment.
Data Source
AI summary
A terminal is disclosed including a receiver that receives a command to command at least one of activation and deactivation for a first cell that is configured with a short TTI having a shorter TTI length than a subframe and a processor that controls at least one of an activation operation and a deactivation operation of the first cell in units of a subframe based on the command. In other aspects, a radio communication method and base station are also disclosed.