Joint Dynamic HARQ Feedback for Multi-TRP Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting hybrid automatic repeat request (HARQ) feedback for multiple transmission reception points (TRPs), particularly in managing interference and ensuring accurate detection of missed downlink control information messages.
Innovation Solution
The implementation of joint dynamic hybrid automatic repeat request (HARQ) feedback techniques, where counter downlink assignment indices (cDAIs) and total downlink assignment indices (tDAIs) are used to coordinate HARQ feedback across multiple TRPs, with methods for assigning these indices based on interference levels and component carriers to ensure accurate reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate HARQ feedback reporting is used for multiple TRPs, then each TRP can independently manage its feedback, but the overall system complexity increases and interference management becomes difficult
Solution Approach 1:
The patent merges HARQ feedback from multiple TRPs into a joint feedback mechanism. The UE receives DCI messages from multiple TRPs and generates a single joint HARQ feedback message that covers all TRPs, rather than generating separate feedback for each TRP. This reduces feedback management complexity while maintaining reliability through coordinated acknowledgment of downlink transmissions across all TRPs.
Solution Approach 2:
The joint HARQ feedback mechanism serves multiple TRPs simultaneously with a single feedback message. The feedback message is designed to be universal, covering acknowledgments for downlink transmissions from multiple TRPs, thereby reducing the number of separate feedback channels needed and simplifying the overall feedback management architecture.
2Productivity
If joint HARQ feedback is implemented for multiple TRPs, then feedback efficiency improves, but the difficulty of detecting missed downlink control information messages increases
Solution Approach 1:
The patent incorporates preliminary error detection mechanisms in the joint HARQ feedback process. The UE performs checks on received DCI messages from multiple TRPs before generating the joint feedback, and the feedback message structure includes fields that allow the network to detect if the UE missed any DCI messages. This preliminary detection action prevents undetected missed messages from compromising the joint feedback efficiency.
3Reliability
If cDAI and tDAI indexing is used for joint HARQ feedback, then coordination across multiple TRPs improves, but the processing requirements and system complexity increase
Solution Approach 1:
The patent uses cDAI (counter DAI) and tDAI (total DAI) fields as intermediary indexing mechanisms in the joint HARQ feedback. These indexing fields act as mediators that coordinate between multiple TRPs and the UE without requiring complex direct communication between all entities. The cDAI tracks the sequence of DCI messages while tDAI provides the total count, enabling simplified coordination across multiple TRPs through standardized index management.
Data Source
AI summary
Techniques and device for wireless communications are described. A wireless device may establish multiple connections with multiple transmission reception points (TRPs). The wireless device may receive downlink control information (DCI) messages from the multiple transmission points and may generate joint hybrid automatic repeat request feedback (HARQ) based on the received downlink control information messages. To support joint HARQ feedback, counter indices may be jointly assigned to the DCI messages generated by the multiple transmission reception points. The method for jointly assigning the DCI messages may be selected based on a level of interference detected in a communications channel. Also, to support joint HARQ feedback, a total counter index in an uplink DCI message may be configured to indicate a total number of DCI message transmitted from a first TRP and a second TRP during a time period.