SPS PDSCH Feedback Handling Under PUCCH Resource Conflicts
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing feedback information transmission for semi-persistent schedule (SPS) Physical Downlink Shared Channels (PDSCH) due to limited availability of PUCCH resources and timing constraints, leading to potential conflicts and inefficiencies in HARQ processes.
Innovation Solution
A method and apparatus for a terminal device to manage feedback information by determining available PUCCH resources and deferring or invalidating feedback information to maintain timing relationships and resource availability, ensuring accurate and stable transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information for SPS PDSCH is transmitted according to configured timing, then timing relationship is maintained, but PUCCH resource conflicts occur when multiple SPS PDSCH with same HARQ process are received
Solution Approach 1:
The terminal device performs preliminary checking before transmitting feedback information to determine whether a PUCCH resource conflict exists. When a conflict is detected (multiple SPS PDSCH with same HARQ process ID requiring feedback in same PUCCH resource), the terminal proactively invalidates the feedback information or marks the SPS PDSCH as invalid, preventing the harmful conflict from occurring in the first place
Solution Approach 2:
Instead of attempting to transmit all feedback information as configured and resolving conflicts afterward, the invention inverts the approach by checking for conflicts first and selectively invalidating feedback information before transmission. This reversal of the normal feedback transmission sequence eliminates resource conflicts while maintaining timing relationships for valid feedback
2Productivity
If multiple SPS PDSCH with same HARQ process are transmitted in different time domain units, then resource utilization is improved, but feedback information accuracy deteriorates due to timing conflicts
Solution Approach 1:
The invention implements a feedback validation mechanism where the terminal device checks whether received SPS PDSCH configurations lead to feedback conflicts. When conflicts are detected, the terminal invalidates the appropriate feedback information and notifies the network device, enabling the network to adjust future SPS configurations to avoid similar conflicts, thereby improving feedback accuracy while maintaining resource utilization
3Loss of time
If PUCCH resources are allocated for frequent feedback transmission, then feedback timeliness is improved, but system complexity increases due to resource management overhead
Solution Approach 1:
The invention extracts and removes conflicting feedback information from the feedback transmission process. By identifying and invalidating feedback information that would cause PUCCH resource conflicts, the system maintains simple resource allocation patterns while avoiding the need for complex dynamic resource management, thus reducing feedback delay without significantly increasing system complexity
Data Source
AI summary
A method for information transmission performed by a terminal device includes that: the terminal device receives a first semi persistent schedule (SPS) physical downlink shared channel (PDSCH) in a first time domain unit, where the first SPS PDSCH carries a first hybrid automatic repeat request (HARQ) process, and feedback information corresponding to the first SPS PDSCH is transmitted in a second time domain unit; and if time domain units before the second time domain unit include a third time domain unit that is used to transmit a second SPS PDSCH, and the second SPS PDSCH carries the first HARQ process, the terminal device invalidates the second SPS PDSCH or the feedback information corresponding to the first SPS PDSCH. A terminal device and a network device are also provided.