Configured Grant PUCCH Transmission Priority Logic
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Solution Overview
Problem
In wireless communication systems, particularly in 5G new radio (NR) and legacy systems like 4G LTE, there is a challenge in efficiently determining which information to transmit on a physical uplink channel (PUCCH) using configured grants, considering downlink feedback information, transmission priorities, and content nature, to ensure optimal resource utilization and reliability.
Innovation Solution
A wireless transmit/receive unit (WTRU) determines which information to transmit on a PUCCH based on configuration information, downlink feedback, and transmission priorities, such as logical channel priorities and reasons for prior transmission failures, to optimize resource allocation and ensure reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the device transmits multiple TBs on PUCCH resources, then the data transmission capacity is improved, but the complexity of determining transmission priority and resource allocation increases
Solution Approach 1:
The patent changes the parameter of transmission priority by introducing logical channel priorities and reason codes that quantify different transmission scenarios. This allows the device to systematically compare and select which TB to transmit based on predefined parameters rather than complex ad-hoc decision-making
Solution Approach 2:
The patent applies different transmission rules and priorities to different logical channels and TB types locally. Each logical channel can have its own priority level, and different reasons for non-transmission (LBT failure, deprioritization, etc.) trigger different behaviors, allowing fine-grained control over transmission decisions
2Reliability
If the device prioritizes control information over data, then the reliability of control signaling is improved, but the data transmission efficiency may deteriorate
Solution Approach 1:
The patent performs preliminary classification and prioritization of TBs before transmission based on their content type (control information vs. data) and logical channel priorities. By pre-determining the priority order, the system ensures control information is transmitted first when resources are limited, while still allowing efficient data transmission when resources are available
Solution Approach 2:
The patent uses feedback mechanisms where the device determines whether to transmit based on downlink feedback information reception and tracks reasons for prior transmission failures. This feedback loop allows the system to adapt transmission decisions to maintain both control signaling reliability and data transmission efficiency
3Reliability
If the device retransmits TBs based on DFI reception and transmission reasons, then the transmission reliability is improved, but the transmission delay increases
Solution Approach 1:
The patent implements dynamic retransmission decisions based on received DFI and the determined reason for non-transmission. The system adapts its retransmission behavior in real-time, selecting TBs for retransmission based on current channel conditions and priority levels rather than following a fixed retransmission schedule
Solution Approach 2:
The patent performs preliminary determination of transmission reasons (LBT failure, deprioritization, etc.) and uses this information to guide retransmission decisions. By pre-classifying the reason for non-transmission, the system can make faster retransmission decisions and reduce overall transmission delay while maintaining reliability
Data Source
AI summary
A device (e.g., a wireless transmit/receive unit (WTRU)) may determine which information (e.g., among multiple transport blocks (TBs)) to be sent on resource(s) of a physical uplink channel (PUCCH) transmission occasion of a configured grant (CG). In an example, the device may receive configuration information. The configuration information may indicate a resource associated with the CG. The device may determine whether to transmit (e.g., on the resource associated with CG) first information of a first TB or second information of a second TB based on one or more of downlink feedback information (DPI) reception, a reason why information of a TB (e.g., the first TB or the second TB) has not been sent in a prior transmission, and a nature of the content (e.g., control information vs. data) in the TB. The first TB may comprise the first information and the second TB may comprise the second information.