Uplink Power Adjustment for Cell Edge Reliability
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Solution Overview
Problem
In uplink data transmission, when the number of non-zero power antenna ports used by a terminal device is less than the total antenna ports configured by the network, the actual transmit power is always less than the channel transmit power, leading to reduced data transmission reliability, especially for terminal devices at the cell edge.
Innovation Solution
A data transmission method where the terminal device determines the actual transmit power based on channel transmit power and various transmission parameters, such as power headroom, waveform, DCI format, modulation and coding scheme, and power adjustment values, to adjust the transmit power flexibly and ensure it is equal to or greater than the channel transmit power, especially for devices at the cell edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the actual transmit power is reduced by using fewer non-zero power antenna ports (N < M), then the power consumption is reduced, but the data transmission reliability deteriorates
Solution Approach 1:
The patent introduces dynamic power adjustment mechanisms where the terminal device can flexibly adjust the actual transmit power based on power headroom information and transmission parameters. The power adjustment value γ is dynamically determined based on whether the terminal is at cell edge or cell center, enabling the system to adapt power consumption to actual transmission needs rather than using a fixed reduced power when N < M.
Solution Approach 2:
The patent changes the power transmission parameter by introducing a power adjustment value γ that modifies the actual transmit power formula from pt = (N/M) × pp to pt = (N/M) × pp × γ. This parameter change allows the actual transmit power to be increased for cell edge terminals (γ > 1) while maintaining reduced power for cell center terminals, thus resolving the contradiction between power consumption and transmission reliability.
2Use of energy by moving object
If the actual transmit power is always less than the channel transmit power when N < M, then the power consumption is reduced, but the demodulation performance deteriorates
Solution Approach 1:
The patent modifies the power transmission parameter by introducing γ (power adjustment value) that can compensate for the reduced transmit power. When N < M, the actual transmit power becomes pt = (N/M) × pp × γ, where γ can be greater than 1 for cell edge terminals, thereby maintaining adequate demodulation performance while still allowing power reduction for cell center terminals.
Solution Approach 2:
The patent employs feedback mechanisms where the terminal device reports power headroom information to the network device, and the network device provides power adjustment indications. This feedback loop enables dynamic adjustment of the power adjustment value γ based on actual channel conditions, ensuring demodulation performance is maintained when power reduction would otherwise be harmful.
3Reliability
If the transmit power is increased for cell edge terminals, then the data transmission reliability is improved, but the interference to other users increases
Solution Approach 1:
The patent applies local quality by differentiating power adjustment strategies for different terminal locations. Cell edge terminals receive power boosting (γ > 1) to improve their transmission reliability, while cell center terminals use normal or reduced power (γ ≤ 1). This localized approach ensures that interference is increased only where necessary for reliability, minimizing overall interference to other users.
Solution Approach 2:
The patent uses parameter changes by introducing the power adjustment value γ that is selectively applied based on terminal location. The parameter γ > 1 is applied only to cell edge terminals needing reliability improvement, while γ ≤ 1 is applied to cell center terminals, thus achieving targeted reliability enhancement without blanket interference increase across all users.
Data Source
AI summary
Example data transmission methods and apparatus are described. One example method includes determining an actual transmit power for first uplink data by a terminal device based on a determined channel transmit power and a transmission parameter. The actual transmit power is less than or equal to the channel transmit power, and the transmission parameter includes one or more of parameters that can be used to indicate a location of the terminal device. The terminal device sends the first uplink data at the actual transmit power. Therefore, the terminal device may determine the actual transmit power for the uplink data based on the channel transmit power and various transmission parameters that can indicate whether the terminal device is located at a cell edge, so that the actual transmit power for the uplink data can be flexibly adjusted.