PUCCH Resource Selection for Combined CQI and HARQ Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing the simultaneous transmission of Channel Quality Information (CQI) and Hybrid Automatic Repeat Request (HARQ) feedback due to resource constraints and collisions, leading to suboptimal performance and increased power consumption.
Innovation Solution
Implementing explicit PUCCH resource allocation by configuring a user equipment (UE) with multiple differently-sized PUCCH resources and using an ACK/NACK Resource Indicator (ARI) to select the appropriate resource based on the combined UCI payload size, ensuring efficient transmission of CQI and HARQ feedback without dropping certain types of feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CQI and HARQ feedback are transmitted simultaneously on dedicated PUCCH resources, then transmission efficiency is improved, but resource collision and dropping of feedback occurs due to resource constraints
Solution Approach 1:
The patent implements dynamic PUCCH resource selection where the UE chooses between CQI resources and HARQ resources based on the type of downlink transmission (unicast vs. multicast/broadcast). This dynamic adaptation allows the system to optimize resource usage for each specific transmission scenario, avoiding the resource collision that occurs with static resource allocation while ensuring reliable feedback transmission for both CQI and HARQ.
2Device complexity
If PUCCH resources are semi-statically configured for ACK/NACK, then resource allocation is simplified, but flexibility to accommodate varying feedback payload sizes is reduced
Solution Approach 1:
The patent segments PUCCH resources into distinct CQI resources and HARQ resources with different configurations. CQI resources are configured with parameters optimized for channel quality reporting, while HARQ resources are configured for acknowledgment feedback. This segmentation allows each resource type to be optimized independently for its specific function, providing both simplified allocation (through clear separation) and adaptability (through independent configuration of each segment).
Solution Approach 2:
The patent enables dynamic modification of PUCCH resource parameters based on the feedback payload requirements. When unicast downlink transmission is detected, the UE switches to HARQ resources with parameters suited for ACK/NACK feedback. When multicast/broadcast transmission is detected, the UE switches to CQI resources with parameters optimized for channel quality reporting. This parameter change approach maintains simplicity through predefined configurations while achieving adaptability through conditional parameter selection.
3Loss of information
If aperiodic CQI is transmitted on PUSCH resources, then CQI feedback is available, but additional uplink resources are consumed
Solution Approach 1:
The patent configures PUCCH resources to serve multiple functions - they can be used for both CQI feedback and HARQ feedback depending on the transmission scenario. By making PUCCH resources multi-functional through dynamic selection, the system eliminates the need for separate PUSCH resources for aperiodic CQI transmission in multicast/broadcast scenarios, thereby reducing overall uplink resource consumption while maintaining CQI feedback availability.
Data Source
AI summary
According to an aspect, a CSI/HARQ feedback-transmitting node receives control information indicating resources in which data is to be received by the node. The control information includes an ACK/NACK Resource Indicator (ARI) having a value indicating one of a plurality of predetermined sets of control channel resources for transmitting CQI feedback and HARQ feedback. The node determines a feedback payload size parameter, based on a number of bits to be reported for CQI feedback and for HARQ feedback, and selects, from a plurality of control channel resources in the predetermined set of control channel resources indicated by the value of the ARI, one of the control channel resources of the predetermined set, based on the feedback payload size parameter. The node transmits CQI feedback and HARQ feedback in the selected control channel resource.