HARQ-ACK Reporting Type Selection in Wireless Signal Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in signal transmission and reception procedures, particularly in handling hybrid automatic repeat request (HARQ) acknowledgments and resource allocation, which impact data reliability and latency in diverse communication scenarios such as multicast and broadcast services.
Innovation Solution
A method for user equipment (UE) in a wireless communication system that receives a physical downlink control channel (PDCCH) to determine HARQ-ACK reporting types and resources based on downlink control information (DCI), enabling or disabling HARQ processes, and flushing reception buffers upon retransmission timers, allowing for efficient data reception and acknowledgment reporting through physical uplink control channels (PUCCH).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK reporting is performed for both ACK and NACK (second reporting type), then data reception reliability is improved, but uplink control channel resource usage increases
Solution Approach 1:
The patent applies dynamics by making the HARQ-ACK reporting type configurable and changeable based on downlink control information. The UE dynamically selects between first reporting type (NACK only) and second reporting type (ACK/NACK both) based on DCI indications, allowing flexible adaptation to different transmission conditions rather than using a fixed reporting mechanism
Solution Approach 2:
The patent changes the parameter of HARQ-ACK reporting configuration based on downlink control information. The reporting type is not fixed but varies according to transmission conditions indicated by DCI, enabling the system to adjust the balance between reliability and resource usage dynamically
2Reliability
If HARQ process is enabled for data reception, then data transmission reliability is improved, but processing complexity and latency increase
Solution Approach 1:
The patent applies dynamics by making HARQ process enable/disable configurable based on downlink control information. The UE dynamically adjusts whether to enable HARQ processing for each transmission, allowing the system to balance reliability requirements against processing complexity and latency constraints in different scenarios
Solution Approach 2:
The patent segments the HARQ processing into conditional operations based on DCI indications. Instead of continuously running full HARQ processing, the system segments the processing based on transmission conditions, enabling HARQ only when needed and skipping it when not required, thus reducing overall processing complexity
3Productivity
If retransmission timer is used to manage HARQ processes, then resource allocation efficiency is improved, but time for buffer flushing increases
Solution Approach 1:
The patent uses feedback from the retransmission timer to trigger buffer flushing operations. The timer provides feedback about retransmission status, and when it expires or indicates maximum retransmissions, the system uses this feedback to flush buffers and free resources, creating an efficient feedback-driven resource management mechanism
Data Source
AI summary
According to an embodiment of the present invention a UE may receive downlink control information (DCI), perform data reception and determine HARQ-ACK based on a result of the data reception, wherein the HARQ-ACK is reported through a physical uplink control channel (PUCCH) based on either: a first reporting type in which the HARQ-ACK reporting is performed for NACK only, or a second reporting type in which the HARQ-ACK reporting is performed for ACK/NACK both, and the UE may select one of the first reporting type and the second reporting type and a resource of the PUCCH based on the DCI.