ARI-Based PUCCH Allocation for Combined UCI Payloads
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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 dropping of certain types of feedback and reduced link performance.
Innovation Solution
Implementing explicit PUCCH resource allocation where a user equipment (UE) is configured with multiple differently-sized PUCCH resources, using an ACK/NACK Resource Indicator (ARI) to select the appropriate resource based on the combined UCI payload size, ensuring optimal use of larger resources for combined UCI transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple feedback types (CQI and HARQ) are transmitted simultaneously on dedicated resources, then link performance is improved, but resource collision and feedback dropping occur due to resource constraints
Solution Approach 1:
The patent segments the feedback transmission resources by creating separate dedicated resources for CQI feedback and HARQ feedback. The CQI is transmitted on PUCCH format 2 resources while HARQ feedback is transmitted on PUCCH format 1a/1b resources, preventing resource collision and ensuring both feedback types can be transmitted simultaneously without dropping
Solution Approach 2:
The patent resolves resource collision by utilizing different PUCCH format dimensions - CQI uses format 2 (channel quality information format) while HARQ uses format 1a/1b (acknowledgment formats). This dimensional separation in the communication protocol space allows simultaneous transmission without interference
2Device complexity
If a single PUCCH resource is used for both CQI and HARQ feedback, then device complexity is reduced, but feedback reliability deteriorates due to resource contention
Solution Approach 1:
The patent segments feedback resources into dedicated CQI resources (PUCCH format 2) and dedicated HARQ resources (PUCCH format 1a/1b), eliminating resource contention while maintaining clear resource management through separate configuration and transmission paths
3Productivity
If CQI and HARQ feedback are transmitted on the same resource, then resource utilization efficiency is improved, but measurement precision of feedback quality deteriorates due to interference
Solution Approach 1:
The patent segments feedback transmission into separate dedicated resources - CQI on format 2 resources and HARQ on format 1a/1b resources - eliminating inter-feedback interference and ensuring high measurement precision while maintaining efficient resource utilization through dedicated allocation
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.