Type 3 HARQ-ACK DCI Field Configuration for Wireless Resource Optimization
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing Type 3 hybrid automatic repeat request (HARQ) acknowledgments, particularly in scenarios where downlink control information (DCI) messages do not schedule physical downlink shared channel (PDSCH) communications, leading to resource allocation confusion and potential synchronization issues between user equipment (UE) and base stations.
Innovation Solution
The method involves a user equipment (UE) receiving DCI messages with specific field values indicating Type 3 HARQ-ACK requests and determining whether PDSCH communications are scheduled based on resource allocation types, allowing the UE to transmit Type 3 HARQ-ACKs only when explicitly requested, thereby optimizing resource usage and avoiding unnecessary communication attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE transmits Type 3 HARQ-ACK based on DCI message reception alone, then the response speed is improved, but resource waste increases due to unnecessary transmission when PDSCH is not scheduled
Solution Approach 1:
The patent changes the decision parameter from simple DCI reception to a composite condition that includes both DCI reception and PDSCH scheduling status. The UE evaluates multiple parameters (DCI field values, resource allocation types) to determine whether to transmit HARQ-ACK, thereby avoiding unnecessary transmissions when PDSCH is not scheduled while maintaining rapid response when needed.
2Reliability
If the UE continuously monitors for HARQ-ACK requests, then the synchronization reliability is improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with the specific field values and resource allocation type indicators that signal HARQ-ACK requests. The UE has advance knowledge of the DCI message structure and knows in advance which field combinations indicate a HARQ-ACK request, eliminating the need for complex real-time analysis while maintaining reliable synchronization.
3Reliability
If the DCI message schedules PDSCH communication, then the communication completeness is improved, but the flexibility decreases when PDSCH is not scheduled but HARQ-ACK is requested
Solution Approach 1:
The patent segments the DCI message analysis into distinct functional components: identifying HARQ-ACK request indicators (first field), determining PDSCH scheduling status (second field), and evaluating resource allocation types. This segmentation allows the UE to independently process each aspect, enabling flexible handling of cases where HARQ-ACK is requested without PDSCH scheduling, while maintaining communication completeness when both are present.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a downlink control information (DCI) message, the DCI message including at least a first field and a second field, the first field indicating a request for Type 3 hybrid automatic repeat request (HARD) acknowledgment (HARQ-ACK), the second field indicating a physical downlink shared channel (PDSCH) communication is not scheduled when a value of the second field includes: all zeros if resource allocation Type 0 is configured, all ones if resource allocation Type 1 is configured, or all ones or all zeros in a dynamic switch configuration. The UE may transmit the Type 3 HARQ-ACK based at least in part on the DCI message. Numerous other aspects are described.