HARQ-ACK Codebook Resource Selection Under Repeated PDCCH
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Solution Overview
Problem
In conventional wireless communication systems, the determination of uplink resources for sending HARQ-ACK codebooks is inconsistent with the actual feedback information needs, leading to resource wastage or reliability issues due to repeated PDCCHs with identical PRI fields, which do not account for all feedback information.
Innovation Solution
A method and apparatus that utilize joint or separate HARQ-ACK feedback mechanisms based on CORESET groups and priority indications to accurately determine uplink resources for HARQ-ACK codebooks, ensuring reliable and efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated PDCCHs with identical PRI fields are used to ensure reliability and reduce latency, then URLLC service reliability is improved, but uplink resource allocation accuracy deteriorates causing resource waste or insufficient resources
Solution Approach 1:
The patent segments the PDCCH repetitions into different groups based on their timing relationships and PRI field values. By dividing the repeated PDCCHs into distinct groups, the system can apply different resource allocation rules to each group, thereby maintaining reliability through repetition while improving the precision of uplink resource allocation for each segment.
Solution Approach 2:
The patent introduces dynamic adaptation in resource allocation by allowing the terminal device to determine uplink resources based on the actual last PDCCH received rather than using a fixed allocation method. This dynamic approach enables the system to adapt to varying PDCCH repetition patterns and timing, improving resource allocation accuracy while maintaining the reliability benefits of repetition.
2Ease of operation
If uplink resource size is determined based on PRI field in last PDCCH, then resource allocation is simplified, but feedback information reliability deteriorates when PDCCH is a repetition
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device monitors multiple PDCCH repetitions and provides feedback based on the actual decoding results of each repetition. The system uses the feedback from the last successfully decoded PDCCH (considering timing and PRI fields) to determine uplink resources, thereby maintaining simplicity while ensuring reliability through adaptive feedback-based resource allocation.
Solution Approach 2:
The patent applies preliminary action by having the terminal device prepare multiple potential uplink resource allocations in advance, corresponding to different PDCCH repetition scenarios. When a PDCCH repetition is received, the terminal device can quickly select the appropriate pre-prepared resource allocation based on the PRI field and timing, maintaining operational simplicity while ensuring reliability through pre-configured options.
3Stability of the object's composition
If PUCCH resource indication is duplicated across repeated PDCCHs, then transmission consistency is improved, but resource matching precision with actual feedback needs deteriorates
Solution Approach 1:
The patent introduces parameter changes by allowing the PUCCH resource indication to vary based on the specific PDCCH repetition being processed. Instead of duplicating the same PRI field value across all repetitions, the system adjusts the resource indication parameters based on the timing, HARQ process ID, and actual feedback requirements associated with each PDCCH repetition, thereby improving resource matching precision while maintaining consistency through structured parameter adjustment.
Data Source
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AI summary
A feedback information sending method and an apparatus are provided. The method includes: A terminal device receives M pieces of DCI sent by a network device, determines, based on resource indication information in third DCI in the M pieces of DCI, a time-frequency resource for sending a HARQ-ACK codebook, and then sends the HARQ-ACK codebook to the network device on the time-frequency resource. A process of selecting the third DCI is as follows: First, the first piece of DCI in DCI repetitions is selected from the M pieces of DCI. Assuming that K pieces of DCI are selected in total, then, a piece of DCI with a last time domain position is selected from the K pieces of DCI as the third DCI. The time-frequency resource for sending the HARQ-ACK codebook is determined by using the foregoing method, so that a size of the determined time-frequency resource can match a quantity of bits of feedback information included in the HARQ-ACK codebook that needs to be sent, thereby effectively improving resource utilization and enhancing reliability of the feedback information.