PUSCH Transmission Priority Handling in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, when physical uplink shared channels (PUSCHs) with identical physical layer priorities overlap in time, data transmission is not specified, leading to potential data loss as the physical layer may drop high-priority data, causing reliability issues in communication services.
Innovation Solution
A method for terminal equipment to determine whether to transmit or not transmit a second PUSCH based on the priorities and types of overlapping PUSCHs, ensuring consistent processing between the media access control (MAC) layer and physical layer, thereby avoiding data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the MAC layer and PHY layer independently determine preemption priorities, then the preemption priority determination is performed at each layer according to its own criteria, but transmission data that is determined to be of higher priority at the MAC layer may be dropped at the PHY layer due to conflicting priority determinations
Solution Approach 1:
The patent merges the priority determination functions of the MAC layer and PHY layer into a unified mechanism. The network device sends indication information that enables the terminal to determine preemption priorities in a unified manner across both layers, ensuring that the MAC layer and PHY layer use consistent priority criteria rather than independently determining priorities according to different criteria.
Solution Approach 2:
The network device provides feedback through indication information (such as RRC signaling or DCI) that guides the terminal's priority determination process. This feedback mechanism ensures that the terminal's MAC layer and PHY layer align their priority determinations with the network's expectations, preventing the mismatch where high-priority data at MAC layer gets dropped at PHY layer.
2Ease of operation
If the physical layer drops data when PUSCH transmissions overlap with identical priorities, then resource conflicts are resolved, but high-priority data determined by the MAC layer is lost
Solution Approach 1:
The network device performs preliminary action by sending indication information before the terminal processes overlapping PUSCH transmissions. This indication information enables the terminal to determine priorities in advance and apply unified priority determination, preventing the situation where the PHY layer automatically drops data without proper priority assessment.
Solution Approach 2:
The indication information from the network device acts as an intermediary that mediates between the MAC layer's priority determination and the PHY layer's transmission decisions. This intermediary guidance ensures that when PUSCH transmissions overlap, the terminal resolves conflicts in a unified manner that preserves high-priority data while still managing resource conflicts.
3Adaptability or versatility
If no specification exists for handling overlapping PUSCHs with identical priorities, then flexibility is maintained, but transmission behavior is unpredictable leading to data loss
Solution Approach 1:
The patent changes the parameter of priority determination by introducing indication information that modifies how priorities are determined. Instead of using default independent determination at each layer, the indication information enables a changed parameter state where unified priority determination is applied, making the transmission behavior predictable and reliable while maintaining flexibility through network-controlled configuration.
Data Source
AI summary
A method and apparatus for transmitting data and a communication system. The apparatus for transmitting data includes a first processing unit, which is configured to transmit a second physical uplink shared channel (PUSCH) by the terminal equipment in a case where a first physical uplink shared channel (PUSCH) and the second physical uplink shared channel (PUSCH) have identical physical layer priorities and transmission of the first physical uplink shared channel (PUSCH) and transmission of the second physical uplink shared channel (PUSCH) at least partially overlap in the time domain.