Uplink Power Control via Dynamic Path Loss Recalculation
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Solution Overview
Problem
Existing power control methods in mobile communications systems, such as open-loop and closed-loop power control, struggle to accurately compensate for continuous changes in path loss and interference during signal transmission, leading to suboptimal signal-to-noise ratios and communication quality issues.
Innovation Solution
A power control method that dynamically adjusts uplink transmit power based on real-time information received during transmission, within a time domain transmission length not exceeding a protocol data unit (PDU), allowing for precise power control and adaptation to changing channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If path loss is calculated during idle timeslot and transmit power is determined according to the calculated path loss, then power control can be implemented, but the transmit power cannot rapidly adapt to continuous changes in path loss and interference
Solution Approach 1:
The patent applies dynamics by enabling the transmit end to perform multiple path loss calculations within a single uplink transmission time domain length. Instead of using a static path loss value determined before transmission, the system dynamically recalculates path loss at multiple points during the transmission process, allowing transmit power to adapt rapidly to changing channel conditions without being constrained by idle timeslot intervals
Solution Approach 2:
The patent implements feedback mechanisms where the transmit end continuously receives first information during uplink signal transmission and uses this feedback to adjust path loss calculations and transmit power in real-time. This closed-loop feedback enables the system to respond to actual channel conditions as they evolve, rather than relying on predetermined or periodically updated path loss values
2Reliability
If transmit power is adjusted based on path loss calculated at the last time, then power control can be maintained, but the signal-to-noise ratio does not conform to expected values due to continuous path loss changes
Solution Approach 1:
The patent applies preliminary action by performing multiple path loss calculations before the uplink transmission is complete. The transmit end calculates path loss at the beginning of the transmission and continues to calculate it at subsequent points during the transmission process, having the measurements ready before they are needed for power adjustment decisions
Solution Approach 2:
The system transitions from static path loss measurement to dynamic multi-point measurement during transmission. By continuously recalculating path loss based on newly received first information, the system maintains accurate path loss values that reflect current channel conditions, thereby improving both measurement precision and communication quality
3Extent of automation
If power control commands are determined before uplink signal is sent, then closed-loop power control can be implemented, but rapid changes in path loss and interference cannot be utilized
Solution Approach 1:
The patent ensures continuity of useful action by maintaining ongoing path loss calculations and power adjustments throughout the entire uplink transmission process. Instead of performing power control operations only before transmission begins, the system continuously updates path loss measurements and adjusts transmit power throughout the transmission, ensuring uninterrupted adaptation to changing conditions
Solution Approach 2:
The system dynamically updates power control decisions during transmission by continuously receiving first information and recalculating path loss. This dynamic approach allows the automated power control system to respond to rapid changes in interference and channel conditions, combining the benefits of automation with real-time adaptability
Data Source
AI summary
Embodiments of this application disclose a power control method and a power control apparatus. The method comprises: receiving, during transmission of an uplink signal of a first time domain transmission length on a channel, at least one piece of first information transmitted on the channel, wherein the first time domain transmission length does not exceed a time domain transmission length of a protocol data unit PDU; and adjusting uplink transmit power during the first time domain transmission length at least according to the at least one piece of first information. By means of the method and the apparatus of the embodiments of this application, in a process of sending an uplink signal, a transmit end device can dynamically adjust transmit power of the uplink signal according to at least one piece of received first information transmitted on a same channel, thereby increasing adjustment granularity of the transmit power, and therefore power control is more precise.