Uplink Control Channel Power Control for Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently determining the power and resource allocation for uplink control channel transmissions, particularly in carrier aggregation operations, which affects network capacity and data rates.
Innovation Solution
The proposed solution involves mechanisms for user equipment (UE) to determine transmission power and resource allocation for physical uplink control channel (PUCCH) transmissions based on the ratio of uplink control information (UCI) bits to resource elements, using cyclic redundancy check (CRC) bits and encoder configurations, and power control procedures to ensure reliable HARQ-ACK information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power for PUCCH is increased to improve detection reliability of HARQ-ACK codewords, then reliability improves, but energy consumption increases
Solution Approach 1:
The patent dynamically adjusts transmission power parameters based on the ratio of UCI bits to resource elements. By changing the power parameter PPUCCH,c(i) according to the information density (OUCI/NRE ratio), the system achieves reliable detection while avoiding excessive energy consumption when high power is not necessary.
Solution Approach 2:
The transmission power is made dynamic rather than static. The power control mechanism adapts the transmission power in real-time based on current transmission conditions, specifically the UCI-to-resource-element ratio, allowing the system to use higher power only when necessary for reliability while conserving energy during normal operations.
2Reliability
If more resource blocks are allocated for PUCCH transmission to improve reliability, then detection reliability improves, but network capacity decreases
Solution Approach 1:
The patent changes the resource allocation parameter MPUCCH,c(i) dynamically based on the UCI-to-resource-element ratio. By adjusting the number of resource blocks according to actual needs rather than allocating maximum resources always, the system maintains detection reliability while preserving network capacity for other users.
Solution Approach 2:
The resource block allocation is made dynamic, adapting to current transmission requirements. The system allocates more resources only when the UCI payload requires it for reliable detection, and uses fewer resources when the payload is small, thereby maintaining reliability while maximizing overall network capacity.
3Reliability
If complex power control procedures are implemented to optimize PUCCH transmission, then transmission reliability improves, but device complexity increases
Solution Approach 1:
The patent implements power control by changing a single key parameter - the transmission power PPUCCH,c(i) - based on a clear metric (UCI-to-resource-element ratio). This focused parameter change approach achieves reliable transmission without requiring complex multi-parameter control mechanisms, thus maintaining relatively simple device implementation.
Data Source
AI summary
A base station indicates, to a user equipment (UE) configured for operation with carrier aggregation, a resource for a transmission of a physical uplink control channel (PUCCH) format that conveys acknowledgement information from the UE, and the UE determines the resource and a transmission power for the PUCCH format.