PUCCH Power Control for Multi-Serving-Cell DCI Scheduling
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Solution Overview
Problem
In 5G NR systems, determining the appropriate PUCCH transmit power for scheduling multiple serving cells is challenging, leading to inefficiencies in DCI overhead and potential interference, especially in scenarios like eMBB, URLLC, and other wireless communication systems.
Innovation Solution
A method for determining PUCCH transmit power based on the value of a field in the first DCI and a positive integer component, where the power is adjusted according to the total amount of DCI detected in a PDCCH monitoring occasion that satisfies a specific condition, optimizing power control and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a single DCI schedules multiple PDSCHs on multiple serving cells, then DCI overhead is reduced, but determining appropriate PUCCH transmit power becomes complex
Solution Approach 1:
The patent segments the PUCCH power control calculation into multiple components (Q1 components), with each component corresponding to a specific serving cell. This segmentation allows the system to handle multiple serving cells scheduled by a single DCI while maintaining organized and manageable power control for each cell individually.
Solution Approach 2:
The patent introduces a new parameter (first field in DCI) that indicates the total amount of DCI detected in PDCCH monitoring occasions. This parameter change enables the system to adapt PUCCH transmit power dynamically based on the actual DCI detection scenario, resolving the complexity in power determination when multiple serving cells are scheduled.
2Reliability
If PUCCH transmit power is increased to ensure reliable transmission, then uplink transmission performance improves, but interference between users increases
Solution Approach 1:
The patent uses the first field in DCI as a feedback mechanism that provides information about the total amount of DCI detected. This feedback enables the receiving end to adjust PUCCH transmit power appropriately, ensuring reliable transmission while avoiding excessive power increases that would cause inter-user interference.
Solution Approach 2:
The patent makes PUCCH transmit power dynamic by linking it to the first field value in DCI. Instead of using fixed or overly conservative power levels, the system adapts power transmission based on actual detection scenarios, improving reliability only when necessary and reducing interference when DCI overhead is already managed efficiently.
3Measurement precision
If PUCCH power control is made more precise, then uplink transmission performance improves, but calculation complexity increases
Solution Approach 1:
The patent segments power control into Q1 components corresponding to different serving cells, allowing precise control for each cell while maintaining overall calculation manageability through modular structure.
Solution Approach 2:
The patent introduces the first field as a key parameter that simplifies the power control calculation. By using this parameter to indicate the total amount of DCI detected, the system achieves precise power control without excessive calculation complexity, as the field value directly guides the power adjustment.
Data Source
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AI summary
The present application discloses a method and apparatus used in a node for wireless communication. The device comprises: a first receiver for receiving first DCI, the first DCI comprising a first field; and a first transmitter for sending a first PUCCH at a first power, wherein the first power depends on a value of the first field at least in the first DCI and Q1 components, Q1 being a positive integer; the Q1 components are in one-to-one correspondence with Q1 serving cells; a given serving cell is one of the Q1 serving cells; for the given serving cell, a corresponding component is equal to the total amount of DCI that is detected in at least one PDCCH monitoring occasion, occupies the given serving cell, and satisfies a first condition, and one DCI satisfying the first condition schedules a plurality of serving cells.