Uplink Power Control for PUCCH Format 3
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Solution Overview
Problem
The existing LTE-A system's PUCCH format 3 experiences reduced ACK/NACK transmission performance due to unbalanced effective information grouping, especially when the ACK/NACK codebook exceeds 11 bits, leading to differences in transmission performance between single-antenna and multi-antenna port transmission modes, and lacks accurate power control solutions to address these differences.
Innovation Solution
An uplink power control method that determines ΔF_PUCCH and h(n) based on the number of bits of uplink control information, using different power offset values for PUCCH formats relative to PUCCH format la, to calculate transmit power accurately, ensuring proper power utilization and avoiding waste, thereby improving transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Dual-RM encoding is adopted for ACK/NACK codebook larger than 11 bits, then the codebook can be divided into two groups for encoding, but the effective information grouping becomes unbalanced leading to reduced transmission performance
Solution Approach 1:
The patent applies local quality by differentiating power control parameters based on the specific transmission scenario. It sets different ΔF_PUCCH(F) values for single-antenna and multi-antenna port transmission modes, and different h(n) values for codebooks ≤11 bits and >11 bits. This localized parameter optimization ensures that each transmission scenario receives the most appropriate power control settings, resolving the unbalanced effective information grouping issue in Dual-RM encoding.
Solution Approach 2:
The patent changes power control parameters (ΔF_PUCCH(F) and h(n)) based on the ACK/NACK codebook size and transmission mode. When codebook >11 bits with multi-antenna port transmission, it uses specific parameter values that differ from single-antenna mode or smaller codebooks. This parameter adaptation directly addresses the transmission performance degradation caused by unbalanced grouping in Dual-RM encoding.
2Ease of operation
If a unified power control formula is used for all PUCCH formats, then the power control method is simple, but the transmission performance varies for different PUCCH formats and bit numbers
Solution Approach 1:
The patent implements local quality by introducing format-specific power offset parameters. Different PUCCH formats (1a, 1b, 2, 2a, 2b, 3) have different ΔF_PUCCH(F) values configured by higher layers. This allows each format to have optimized power control settings tailored to its specific characteristics, ensuring consistent transmission performance across formats while maintaining relatively simple power control calculations through standardized formula structure.
Solution Approach 2:
The patent introduces dynamic power control parameters that can be adjusted based on transmission conditions. The parameters P0_NOMINAL_PUCCH, P0_UE_PUCCH, and ΔF_PUCCH(F) can be dynamically configured by higher layers to adapt to different transmission scenarios, bit numbers, and antenna modes, allowing the power control system to respond dynamically to changing conditions while maintaining operational simplicity.
3Device complexity
If power offset parameters are not differentiated for different transmission modes, then the configuration is simple, but the transmission performance differs between single-antenna and multi-antenna port modes
Solution Approach 1:
The patent applies local quality by configuring different power control parameters for single-antenna and multi-antenna port transmission modes. Specifically, it sets different h(n) values and ΔF_PUCCH(F) values based on the antenna mode and codebook size. This localized parameter optimization ensures that multi-antenna port transmission achieves better performance without significantly increasing configuration complexity, as the parameters are still managed through standardized higher layer signaling.
Data Source
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AI summary
Disclosed are an uplink power control method, power control parameter configuration method and apparatus thereof. The uplink power control method comprises: a user equipment receives data in M downlink sub-frames of N downlink carriers and generates uplink control information, wherein the uplink control information of the M downlink sub-frames is transmitted in one uplink sub-frame; the user equipment determines ΔF_PUCCH(F) and h(n) for calculating the transmit power of a physical uplink control channel (PUCCH) according to whether the number of bits of the uplink control information is larger than a predefined threshold; ΔF_PUCCH(F) represents the power offset of different PUCCH formats relative to the PUCCH format la, h(n) represents the power offset corresponding to the number of transmission bits of the PUCCH; the user equipment calculates the PUCCH transmit power according to ΔF_PUCCH(F) and h(n), and sending the uplink control information on the PUCCH using the calculated transmit power. The present invention can improve the accuracy of power control, thus enhance the transmission performance of the uplink control information.