User Terminal Scheduling for Short TTI Processing
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Solution Overview
Problem
In next-generation mobile communication systems, the introduction of shorter time units than 1-ms TTIs poses a challenge for user terminals to properly transmit power headroom reports and channel state information, leading to potential declines in communication quality due to insufficient processing time.
Innovation Solution
A user terminal is equipped with a receiving section and a control section that schedules UL channel transmission based on both the initial and processing times required to generate this information, allowing for controlled transmission timing and content determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If shorter time units (shorter than 1-ms TTIs) are introduced to increase data rates and reduce latency, then productivity is improved, but the user terminal cannot properly transmit power headroom reports and channel state information due to insufficient processing time
Solution Approach 1:
The patent applies dynamics by making the TTI length flexible and adjustable rather than fixed. The system can dynamically switch between shorter TTIs for high-speed data transmission and longer TTIs when processing time is insufficient for control information, thereby adapting to different operational requirements and resolving the contradiction between speed and reliability
Solution Approach 2:
The patent changes the time parameter (TTI length) based on processing requirements. When control information needs to be transmitted, the system extends the TTI duration to ensure sufficient processing time, while using shorter TTIs when high data rates are the priority, thus maintaining communication quality while improving productivity
2Productivity
If the scheduling timing is configured shorter than heretofore to adapt to shorter time units, then productivity is improved, but the user terminal cannot generate and transmit given information (PHR, CSI) properly due to insufficient processing time
Solution Approach 1:
The patent applies preliminary action by having the user terminal start processing control information (PHR, CSI) as early as possible after receiving the scheduling command, and by allowing the base station to configure the timing with sufficient advance notice, ensuring that processing can be completed before transmission is required
Solution Approach 2:
The system dynamically adjusts the scheduling timing based on the user terminal's processing capabilities and current load conditions, allowing flexible optimization of both scheduling efficiency and processing time completion
3Productivity
If the timing for transmitting delivery acknowledgment signals is configured shorter than heretofore, then productivity is improved, but communication quality may decline due to insufficient processing time
Solution Approach 1:
The patent changes the feedback timing parameter dynamically, using shorter intervals when high feedback speed is needed and terminal processing allows, and extending the interval when processing time is insufficient, thereby maintaining both productivity and reliability
Data Source
AI summary
A terminal is disclosed including a receiver that receives downlink control information that triggers channel state information (CSI) reporting using an uplink shared channel; and a processor that controls the CSI reporting based on a given value and transmission timing of at least one of the uplink shared channel and a delivery acknowledgement signal (HARQ-ACK). In other aspects, a radio communication method for a user terminal is also disclosed.