PUCCH SR Collision Handling via DMRS Phase Rotation
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Solution Overview
Problem
In 5G NR communication, the unpredictable triggering of scheduling request (SR) information can lead to collisions with demodulation reference signals (DMRS) and uplink control information (UCI) on the physical uplink control channel (PUCCH), particularly when long PUCCH formats are used, causing transmission inefficiencies and errors.
Innovation Solution
The method involves performing phase rotation on the DMRS symbol at the closest subsequent appearance position of the SR information, allowing the phase-rotated symbol to carry the SR information, and simultaneously transmitting it with the PUCCH information, ensuring reliable transmission of both SR and PUCCH data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SR information is transmitted on PUCCH with long PUCCH format, then SR information can be transmitted, but collision with DMRS and UCI occurs causing transmission errors
Solution Approach 1:
The patent segments the PUCCH transmission by identifying specific symbol positions (e.g., first and last symbols) to carry SR information, separating it from the middle symbols carrying UCI. This segmentation prevents collision between SR and UCI/DMRS by assigning them to distinct time resources within the PUCCH structure.
Solution Approach 2:
The patent utilizes the time dimension by selecting specific symbol positions within the PUCCH structure to transmit SR information. By moving from a flat resource allocation to a structured time-position-based allocation, the system can accommodate multiple types of information (SR, UCI, DMRS) without collision.
2Adaptability or versatility
If SR triggering is made unpredictable for flexible scheduling, then scheduling flexibility is improved, but collision with PUCCH resources becomes unavoidable
Solution Approach 1:
The patent performs preliminary actions by pre-configuring multiple PUCCH resources with different periods and offsets. When SR is triggered unpredictably, the system can select from these pre-prepared resources, avoiding collision without requiring real-time resource allocation decisions.
Solution Approach 2:
The patent introduces dynamic resource selection mechanisms where the PUCCH resource for SR transmission is determined based on the triggering time and configured parameters. This dynamic adaptation allows the system to handle unpredictable SR triggers while avoiding collisions through real-time resource matching.
3Device complexity
If PUCCH period is configured to match SR period, then resource allocation is simplified, but transmission efficiency decreases when SR is not frequently triggered
Solution Approach 1:
The patent applies local quality by configuring PUCCH resources with different periods and offsets for different SR triggering scenarios. Instead of using a uniform period for all cases, the system locally adapts the resource configuration to match the actual SR triggering pattern, improving efficiency while maintaining manageable complexity.
Data Source
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AI summary
The present disclosure provides an information transmission method, a user equipment and a network device. The information transmission method includes: when collision between scheduling request (SR) information to be transmitted by the UE and information on physical uplink control channel (PUCCH) occurs, transmitting the SR information and/or the information on the PUCCH.