PUCCH Resource Determination Using DCI and Implicit Indication
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Solution Overview
Problem
In future radio communication systems, determining the appropriate PUCCH resource for transmitting UCI is challenging when the number of PUCCH resources exceeds the number that can be indicated by the given field in the DCI, leading to potential misconfiguration.
Innovation Solution
A user terminal determines the PUCCH resource for UCI transmission based on a given field value in DCI and implicit indication information from the selected resource set, allowing for accurate selection even when the number of resources exceeds the field's capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of PUCCH resources in a resource set is increased to provide more options for UCI transmission, then the adaptability and versatility of the system is improved, but the device complexity and difficulty of determining the appropriate resource increases when the number exceeds the DCI field indication capacity
Solution Approach 1:
The patent divides the PUCCH resource determination process into two independent stages: first selecting a resource set based on UCI payload size, then selecting a specific resource within that set using DCI field indication. This segmentation allows the system to support a large total number of resources while keeping the determination process manageable at each stage.
Solution Approach 2:
The patent introduces implicit indication information as an intermediary mechanism that works together with the explicit DCI field indication. The implicit information (derived from lowest CCE index, search space, or SCell index) serves as a mediator that resolves the conflict between having many resources and being able to indicate them with limited DCI bits.
2Measurement precision
If the DCI field size is increased to directly indicate more PUCCH resources, then the measurement precision and indication accuracy is improved, but the loss of information in the control channel increases and overhead increases
Solution Approach 1:
The patent transitions from a one-dimensional indication approach (using only DCI field bits) to a two-dimensional approach by combining explicit DCI field indication with implicit indication information derived from other parameters. This dimensional change allows accurate resource identification without increasing DCI field size.
Solution Approach 2:
The patent enables the system to use existing DCI parameters (lowest CCE index, search space index, SCell index) for their primary purposes while simultaneously utilizing them as implicit indicators for PUCCH resource selection. This self-service approach eliminates the need for additional dedicated indication bits.
3Reliability
If implicit indication information is used to determine PUCCH resources when the resource set size exceeds DCI field capacity, then the reliability of resource determination is improved, but the device complexity increases due to the need to derive implicit information from multiple parameters
Solution Approach 1:
The patent performs preliminary selection of the PUCCH resource set based on UCI payload size before the DCI field indication is processed. This preliminary action narrows down the search space and establishes a clear hierarchy in the determination process, improving reliability by ensuring the correct set is selected first.
Solution Approach 2:
The patent changes the determination parameters dynamically based on the UCI payload size. Different implicit indication methods (lowest CCE index, search space index, SCell index) are applied depending on the specific scenario, allowing flexible and reliable resource determination adapted to different communication conditions.
Data Source
AI summary
A user terminal according to the present invention includes: a transmission section that transmits Uplink Control Information (UCI) by using an uplink control channel; and a control section that, when one or more resource sets each including one or more resources for the uplink control channel are configured, determines a resource used for transmission of the UCI based on a given field value in Downlink Control Information (DCI) and implicit indication information from a resource set selected based on a number of bits of the UCI.