Terminal Uplink Power Limit Control for Better NR Coverage
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Solution Overview
Problem
The nominal maximum output power, evaluation period, and power class in uplink (UL) transmission for future radio communication systems like NR are not clearly defined, leading to potential reductions in coverage, communication quality, and throughput.
Innovation Solution
A terminal and radio communication method that determine the upper limit of transmit power for UL transmission by considering the actual amount of resources and power used in previous transmissions, allowing for the definition of new power classes and adjustments to the configured maximum output power based on specific criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the nominal maximum output power and evaluation period are not clearly defined, then device complexity is reduced, but coverage and communication quality deteriorate
Solution Approach 1:
The patent changes the parameters of maximum output power and evaluation period from undefined to specifically defined values. The maximum output power is set to 30 dBm or higher, and the evaluation period is defined as a specific time window, transforming the vague parameters into concrete specifications that enable reliable UL transmission coverage.
Solution Approach 2:
The patent performs preliminary determination of the upper limit of transmit power before actual UL transmission occurs. By calculating the upper limit based on maximum output power and resource amount in advance, the system ensures coverage and communication quality are maintained from the start of transmission.
2Device complexity
If transmit power is not optimized based on actual resource usage, then device complexity is reduced, but throughput and communication quality deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the actual resource amount used in previous UL transmissions is measured and fed back to determine the upper limit of transmit power for subsequent transmissions. This feedback loop enables dynamic optimization of transmit power based on actual usage patterns, improving throughput without excessive complexity.
Solution Approach 2:
The patent makes the transmit power limit dynamic by adjusting it based on actual resource usage in previous transmissions. The upper limit of transmit power is not fixed but adapts to the actual conditions, allowing the system to optimize throughput dynamically while managing device complexity.
3Device complexity
If coverage is not improved through power optimization, then device complexity is reduced, but communication quality deteriorates
Solution Approach 1:
The patent changes the power class parameter by defining new power classes with specific maximum output power levels (30 dBm or higher). This parameter change enables the system to achieve improved coverage and communication quality while managing device complexity through standardized power class definitions.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a control section that determines, based on at least one of a specific maximum output power, a resource amount used for one or more first uplink transmissions, and a first transmit power used for the one or more first uplink transmissions, an upper limit of a second transmit power for a second uplink transmission, and a transmitting section that performs the second uplink transmission by using the second transmit power. An aspect of the present disclosure allows coverage of UL transmission to be improved.