Channel Dropping Between SR and PUSCH
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Solution Overview
Problem
Current wireless communication systems face limitations in channel dropping between scheduling request (SR) and physical uplink shared channel (PUSCH), leading to inefficiencies and dropped high-priority HARQ-ACKs due to overlapping priorities, which affect communication flexibility and efficiency.
Innovation Solution
A user equipment (UE) and base station (gNB) are configured to determine channel dropping behavior based on uplink control information (UCI) priority, allowing for selective transmission or reception of SR and PUSCH based on overlapping conditions, ensuring high-priority UCI is preserved and transmitted or received while low-priority channels are dropped.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PUCCH with high-priority SR overlaps with a PUSCH with low-priority data, then the SR can be transmitted, but the PUSCH transmission is cancelled causing loss of data transmission
Solution Approach 1:
The patent introduces priority parameters (priority index 0 for low-priority, priority index 1 for high-priority) to differentiate between SR and PUSCH transmissions. By changing the parameter of priority level, the system determines whether to transmit PUCCH with SR or cancel PUSCH, resolving the contradiction between ensuring SR reliability and maintaining data transmission efficiency
Solution Approach 2:
The patent applies different transmission rules based on the local condition of priority levels. When high-priority SR overlaps with low-priority PUSCH, the system locally applies the rule to transmit SR and cancel PUSCH. However, when low-priority SR overlaps with high-priority PUSCH, the system locally applies the opposite rule to transmit PUSCH and cancel SR, thus optimizing both reliability and efficiency in different local scenarios
2Ease of operation
If channel dropping rules are applied to resolve overlapping between SR and PUSCH, then transmission conflicts are resolved, but high-priority UCI may be dropped due to incorrect priority handling
Solution Approach 1:
The patent inverts the traditional channel dropping logic by prioritizing UCI content over channel type. Instead of always dropping PUSCH when SR overlaps, the system inverts the rule to drop SR when high-priority UCI is multiplexed on PUSCH. This inversion ensures high-priority UCI is preserved while still resolving transmission conflicts
Solution Approach 2:
The patent introduces an intermediary evaluation step that checks whether high-priority UCI is multiplexed on the PUSCH before determining the dropping behavior. This intermediary check acts as a mediator between SR transmission and PUSCH transmission, ensuring that high-priority UCI is protected while still allowing conflict resolution
3Productivity
If the system transmits both high-priority SR and UCI on PUSCH simultaneously, then communication efficiency improves, but channel overlapping conflicts increase
Solution Approach 1:
The patent implements dynamic channel dropping behavior that adapts based on the multiplexing conditions. The system dynamically evaluates whether high-priority UCI is present on PUSCH and adjusts the dropping decision accordingly. This dynamic approach allows simultaneous transmission of SR and UCI when conditions permit, improving efficiency while managing overlap complexity through adaptive rules
Data Source
AI summary
A user equipment (UE) is described. The UE includes a processor configured to determine a channel dropping behavior based on a priority of uplink control information (UCI) multiplexed on a physical uplink shared channel (PUSCH). The UE also includes transmitting circuitry. The transmitting circuitry is configured to. if a physical uplink control channel (PUCCH) for a positive scheduling request (SR) with priority index 1 overlaps with the PUSCH with a priority index 0, and if there is no UCI or only low-priority UCI is multiplexed on the PUSCH, transmit the PUCCH with the positive high-priority SR and cancel transmission of the PUSCH. Or. the transmitting circuitry is configured to. if the PUCCH for the positive SR with the priority index 1 overlaps with the PUSCH with the priority index 0). and if there is at least a high-priority UCI multiplexed on the low-priority PUSCH, transmit the low-priority PUSCH without transmitting the PUCCH with the positive high-priority SR.