Terminal Random Access Triggering for Multi-TRP Timing Alignment
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Solution Overview
Problem
In future radio communication systems, controlling uplink transmission to multiple transmission/reception points (TRPs) is challenging, leading to potential deterioration in communication quality due to improper timing advance control.
Innovation Solution
A terminal equipped with a receiving section to receive timing advance information and a control section to trigger a random access procedure based on the uplink synchronization status of each TRP, ensuring appropriate communication by managing timing advance for each TRP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UL transmission is performed to multiple TRPs, then communication capacity is improved, but timing advance control becomes complex and communication quality deteriorates
Solution Approach 1:
The patent segments the timing advance control into separate entities for each TRP by introducing TRP-specific timing advance parameters (ta1, ta2) and separate time alignment timers (timeAlignmentTimer1, timeAlignmentTimer2). This allows independent timing control for each transmission/reception point, resolving the complexity of managing multiple TRPs simultaneously while maintaining communication capacity benefits
Solution Approach 2:
The patent implements dynamic timing advance adjustment through separate time alignment timers that can be independently started, stopped, and adjusted for each TRP. The system dynamically selects which TRP to transmit to based on current synchronization status, enabling flexible adaptation to changing communication conditions without overwhelming complexity
2Reliability
If timing advance is controlled for each TRP, then communication quality is maintained, but system complexity increases
Solution Approach 1:
The patent applies segmentation by creating separate timing advance parameters and time alignment timers for each TRP. This modular approach maintains communication quality through precise individual TRP control while managing system complexity through structured organization of parameters rather than monolithic handling
Solution Approach 2:
The patent implements feedback mechanisms where the terminal monitors uplink synchronization status for each TRP and adjusts timing advance parameters accordingly. The system uses synchronization information to dynamically modify timing advance values, ensuring communication quality is maintained through continuous feedback-based optimization
3Reliability
If random access procedure is triggered frequently to maintain time alignment, then communication reliability is improved, but access delay increases
Solution Approach 1:
The patent applies preliminary action by starting time alignment timers in advance before actual transmission occurs. The time alignment timers are started when synchronization is detected, allowing the system to prepare timing adjustments beforehand rather than reacting after delays occur, thus maintaining reliability while minimizing access delay
Solution Approach 2:
The patent implements dynamic triggering of random access procedures based on real-time synchronization status monitoring. The system only initiates time alignment procedures when necessary (when synchronization is lost or expected to be lost), rather than frequently or continuously, thereby maintaining reliability through timely intervention while reducing unnecessary access delays
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives information related to timing advance to be used for a transmission/reception point; and a control section that judges, when configuration of timing advance of each transmission/reception point is supported, trigger of a random access procedure, based on at least one of an uplink synchronized status of each transmission/reception point and establishment of time alignment of each transmission/reception point.