Terminal PUCCH Repetition Spatial Relation Control
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Solution Overview
Problem
In next-generation mobile communication systems, particularly in NR specifications, the control of repeated UL transmission when multiple transmission/reception points (TRPs) are used is not adequately addressed, leading to potential reductions in throughput and communication quality due to unclear spatial relations.
Innovation Solution
A terminal is equipped with a control section to determine default spatial relations for repetition transmission of the physical uplink control channel (PUCCH), using a spatial domain transmission filter based on these relations to manage repetition transmission effectively across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If repetition transmission is performed without clear spatial relation control in multi-TRP scenarios, then the system can support basic uplink transmission, but throughput and communication quality deteriorate due to ambiguous spatial relations
Solution Approach 1:
The patent applies parameter changes by dynamically selecting spatial relations (beam directions) for repetition transmissions. The terminal device determines default spatial relations based on downlink beam information and applies different spatial domain transmission filters for different repetition occasions, optimizing both throughput and communication quality through adaptive parameter selection.
Solution Approach 2:
The patent implements preliminary action by pre-determining default spatial relations before repetition transmission begins. The terminal device identifies appropriate spatial relations based on downlink beam correspondence and configures spatial domain transmission filters in advance, ensuring proper beam alignment is established before actual uplink repetition transmissions occur.
2Reliability
If multiple spatial relations are configured for multi-TRP repetition transmission, then communication quality improves, but system complexity increases due to additional control signaling and determination procedures
Solution Approach 1:
The patent applies self-service by enabling the terminal device to autonomously determine default spatial relations for repetition transmission. The terminal independently identifies appropriate spatial relations based on downlink beam information and configures its own spatial domain transmission filters without requiring complex network-side configuration or additional control signaling, thereby reducing system complexity while maintaining communication quality.
Solution Approach 2:
The patent implements universality by making the downlink beam information serve multiple purposes. The same downlink beam correspondence information is used both for downlink reception and for determining uplink spatial relations for repetition transmission, eliminating the need for separate uplink beam configuration procedures and reducing overall control complexity.
3Reliability
If spatial domain transmission filters are dynamically adjusted for repetition transmission, then communication quality improves, but processing requirements and computational load increase
Solution Approach 1:
The patent applies preliminary action by pre-determining default spatial relations and configuring spatial domain transmission filters before repetition transmission begins. This advance preparation allows the terminal to use predetermined filter settings throughout the repetition transmission process, avoiding the need for dynamic recalculation and reducing processing energy consumption during actual transmission.
Solution Approach 2:
The patent implements parameter changes by selecting from a limited set of pre-identified spatial relations rather than continuously optimizing parameters. The terminal determines default spatial relations based on downlink beam information and applies these predetermined parameters throughout repetition transmission, reducing computational complexity and processing energy requirements compared to continuous optimization approaches.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes: a control section that determines one or more default spatial relations to be applied to transmission occasions of repetition transmission of a physical uplink control channel (PUCCH); and a transmitting section that performs the repetition transmission by using a spatial domain transmission filter based on the one or more default spatial relations. According to an aspect of the present disclosure, repetition UL transmission can be appropriately controlled.