PUCCH Power Calculation for Multi-Carrier Uplink Control
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Solution Overview
Problem
The existing power control mechanism for the physical uplink control channel (PUCCH) in LTE-A systems fails to perform effective power control when uplink control information supporting a maximum of 32 carriers is fed back, leading to capacity shortages and inefficiencies.
Innovation Solution
A method that calculates transmit power for the PUCCH based on obtained parameter information, including resource block quantity, Reed-Muller code quantity, orthogonal cover code quantity, coding format, modulation format, and scale factor value, allowing for precise power adjustment using coefficients and functions such as linear, logarithmic, or exponential calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If massive carrier aggregation (32 carriers) is used to increase peak data rate and system throughput, then the data rate increases, but the PUCCH capacity becomes insufficient due to exponential increase in uplink control information overhead
Solution Approach 1:
The patent segments the PUCCH transmission by introducing different PUCCH formats (Format 1, 1a, 1b, 2, 2a, 2b, 3) with different capabilities for carrying UCI. Format 3 is specifically designed to handle larger quantities of UCI bits (greater than 11 bits) by using different coding schemes and resource allocation, thereby dividing the control channel capacity into manageable segments that can handle the exponential increase in control information from 32 carriers.
2Ease of operation
If existing power control mechanism is used for PUCCH, then power control is simple, but it cannot perform effective power control when UCI supporting 32 carriers is fed back, leading to capacity shortages
Solution Approach 1:
The patent introduces dynamic power control adjustments by modifying the PUCCH power control formula to include terms that adapt to the quantity of UCI bits and the PUCCH format being used. The formula dynamically adjusts transmit power based on the actual control information load, ensuring effective power control whether carrying 11 bits or more of UCI, thereby maintaining reliability across different carrier aggregation scenarios while preserving operational simplicity through a unified formula.
3Quantity of substance
If PUCCH format is optimized to carry more UCI bits, then the control information capacity increases, but the power control complexity increases and existing mechanisms fail
Solution Approach 1:
The patent changes key parameters in the power control mechanism by introducing format-dependent power adjustments (ΔF_PUCCH(F)) and UCI-bit-quantity-dependent compensations (h(nCQI, nHARQ, nSR)). These parameter changes allow the power control system to adapt to different PUCCH formats and UCI loads without fundamentally redesigning the power control architecture, thereby increasing UCI capacity while managing complexity through parameter optimization rather than structural complexity.
Data Source
AI summary
A method, a terminal, and a base station are provided. The method includes: obtaining parameter information of a physical uplink control channel (PUCCH), where the parameter information includes one or more of quantity information of a resource block (RB), quantity information of a Reed-Muller (RM) code, quantity information of an orthogonal cover code (OCC), coding format information, modulation format information, and value information of a scale factor (SF) of the PUCCH, or the parameter information includes at least one configuration parameter corresponding to one or more of quantity information of an RB, quantity information of an RM code, quantity information of an OCC, coding format information, modulation format information, and value information of an SF; calculating transmit power of the PUCCH according to the parameter information; and transmitting the PUCCH according to the calculated transmit power.