HARQ-ACK Feedback Grouping for Multi-Site Scheduling
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Solution Overview
Problem
In non-ideal backhaul scenarios, coordinating multi-site scheduling for hybrid automatic repeat request (HARQ-ACK) information feedback is challenging due to large communication delays between network devices, leading to inaccurate data reception and decoding status feedback.
Innovation Solution
A method for generating and sending separate HARQ-ACK information for PDSCHs from different network devices based on DMRS port groups, enabled transport blocks, PDCCH configurations, and receive beams, ensuring accurate feedback by grouping PDSCHs from the same network device for timely retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate HARQ-ACK feedback is implemented for PDSCHs from different network devices, then feedback accuracy is improved, but system complexity increases due to multiple DCI groups and PDSCH group management
Solution Approach 1:
The patent segments PDSCHs into different groups based on their originating network device. Each PDSCH group is associated with a specific DCI group, allowing separate HARQ-ACK feedback handling for each group. This segmentation enables accurate tracking of which network device transmitted which data, resolving the feedback accuracy issue while managing complexity through structured grouping.
Solution Approach 2:
The patent introduces DCI groups as intermediary entities that mediate between multiple network devices and HARQ-ACK feedback mechanisms. Each DCI group carries scheduling information for a specific PDSCH group, acting as an intermediary that organizes and manages the relationship between multiple transmitters and the feedback system, thereby improving accuracy without overwhelming system complexity.
2Productivity
If multi-site scheduling is implemented with multiple network devices, then data transmission capacity is improved, but coordination difficulty increases due to non-ideal backhaul conditions
Solution Approach 1:
The patent segments the multi-site scheduling system into independent DCI groups and PDSCH groups, each managed separately. This segmentation allows each network device to schedule its own PDSCHs independently with dedicated DCI, reducing coordination overhead and difficulty while maintaining high data transmission capacity through parallel operations.
Solution Approach 2:
The patent implements preliminary grouping of PDSCHs and their associated DCIs before HARQ-ACK feedback generation. By pre-organizing PDSCHs into groups based on their network device origin and linking them to specific DCI groups, the system prepares the structure in advance, simplifying subsequent feedback coordination and reducing real-time coordination difficulty among multiple network devices.
Data Source
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AI summary
This application provides a method for sending HARQ-ACK information, a method for receiving HARQ-ACK information, and a communications apparatus. The method includes: A terminal device generates at least two pieces of HARQ-ACK information based on a plurality of received PDSCHs, and sends the at least two pieces of HARQ-ACK information to a network device. Each piece of HARQ-ACK information includes an ACK or a NACK fed back for one or more PDSCHs. When a piece of HARQ-ACK information includes ACKs or NACKs fed back for a plurality of PDSCHs, at least one of the following of the plurality of PDSCHs corresponding to the HARQ-ACK information is the same: port groups to which ports of DMRSs used to demodulate the PDSCHs belong, identifiers of enabled transport blocks carried in the plurality of PDSCHs, and PDCCH configurations of a plurality of PDCCHs used to schedule the plurality of PDSCHs. Based on the foregoing method, the terminal device can determine which PDSCHs in the plurality of received PDSCHs are from a same network device. In this way, receiving and decoding statuses of each PDSCH can be accurately fed back in a case of multi-site scheduling, helping the network device make a proper decision. This helps improve data transmission performance and improve user experience.