PUCCH Power Control Across Multiple DCI Detections
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Solution Overview
Problem
In next-generation mobile communication systems like NR, the transmission power of uplink control channels (PUCCH) is not appropriately controlled due to the accumulation of TPC command field values from multiple pieces of DCI, leading to inconsistent power levels.
Innovation Solution
A method to accumulate TPC commands from specific pieces of DCI based on criteria such as PRI field values, counter DAI, or timing of DCI detection to ensure consistent PUCCH transmission power across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a user equipment camps on a frequency with a large frequency separation from its serving cell frequency, then the user equipment may experience poor reception quality and failed random access, but switching to a different frequency increases handover complexity and signaling overhead
Solution Approach 1:
The base station pre-configures multiple candidate frequencies and their corresponding uplink carrier frequencies in the SIB6/SIB7 messages before the user equipment needs to perform random access. This preliminary preparation eliminates the need for complex real-time frequency searching and handover management, allowing the user equipment to directly select from pre-evaluated frequencies that guarantee adequate reception quality
Solution Approach 2:
The SIB6 and SIB7 system information blocks serve as intermediaries that carry pre-configured frequency allocation information from the base station to the user equipment. These information blocks contain detailed frequency configuration data including absolute frequency points, ARFCN values, and uplink carrier mappings, enabling the user equipment to perform random access without direct real-time interaction with the base station for frequency selection
2Adaptability or versatility
If the base station allocates multiple uplink carrier frequencies for different downlink frequencies, then the user equipment can perform random access on appropriate frequencies, but the base station requires additional configuration and management overhead
Solution Approach 1:
The SIB6 and SIB7 information blocks serve multiple functions simultaneously: they provide frequency allocation information for random access, contain uplink carrier frequency mappings, and deliver other system parameters. This multi-functionality reduces the need for separate dedicated signaling messages for each type of information, thereby reducing overall signaling overhead despite the increased frequency adaptation capability
Solution Approach 2:
The base station manages frequency configurations by changing parameters within the existing SIB6/SIB7 structures rather than creating entirely new configuration mechanisms. By modifying frequency allocation parameters, ARFCN values, and carrier mappings within these standardized information blocks, the base station achieves flexible frequency adaptation while utilizing established signaling frameworks, thus limiting the increase in configuration complexity
Data Source
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AI summary
A base station of the present invention includes a transmitting section that transmits a plurality of pieces of downlink control information each including a first field value to be used for control of a transmission power of an uplink control channel and a second field value to be used to determine a resource for the uplink control channel; and a control section that controls, in a case that second field values each corresponding to the second field value are configured to be a same value, configuration of first field values each corresponding to the first field value. With this, it is possible to appropriately control a transmission power of an uplink control channel.