UMTS Power Control Command Transmission Frequency Reduction
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Solution Overview
Problem
Conventional UMTS FDD systems face limitations in reducing interference and increasing system capacity due to the frequent transmission and decoding of power control commands, which affects the minimization of transmit powers and leads to suboptimal system performance.
Innovation Solution
The proposed power control method involves transmitting and decoding power control commands at reduced frequencies by sending one command for every group of consecutive slots, either two or three, on a dedicated physical channel, thereby reducing interference and optimizing system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power control commands are transmitted frequently, then power control responsiveness is improved, but transmit power and interference increase
Solution Approach 1:
The patent implements periodic power control by transmitting commands at reduced frequencies (e.g., every 2 or 3 slots instead of every slot). This periodic action maintains sufficient control responsiveness while significantly reducing the transmit power consumption and interference associated with continuous frequent transmissions.
Solution Approach 2:
The system dynamically adjusts the power control command transmission frequency based on channel conditions and system requirements. The transmitter and receiver coordinate to determine optimal timing, allowing the system to adapt between more frequent control updates when needed and reduced frequency to minimize power consumption and interference.
2Reliability
If power control commands are transmitted frequently, then power control responsiveness is improved, but system capacity decreases
Solution Approach 1:
By implementing periodic power control commands transmitted at reduced frequencies, the system frees up time resources that can be allocated to data transmission. This periodic action directly increases system capacity by reducing the overhead associated with frequent control signaling while maintaining adequate power control functionality.
Solution Approach 2:
The patent segments the power control function from continuous operation, separating control signaling from data transmission time slots. This segmentation allows the system to allocate resources more efficiently, dedicating specific slots to control commands and others to data, thereby increasing overall system capacity.
3Reliability
If power control commands are transmitted frequently, then power control responsiveness is improved, but interference increases
Solution Approach 1:
The patent applies periodic action by transmitting power control commands at reduced frequencies rather than continuously. This significantly reduces the interference generated by control signaling, as fewer commands are transmitted over time, while still maintaining sufficient responsiveness for effective power control.
Solution Approach 2:
The system performs preliminary power control adjustments based on historical channel conditions and predicts future requirements, reducing the need for frequent real-time commands. This preliminary action allows the system to maintain power control effectiveness while transmitting commands less frequently, thereby reducing interference.
Data Source
AI summary
Power control methods are provided. The power control method, performed by a receiving end device, includes receiving two consecutive slots from a dedicated physical channel (DPCH), determining a transmit power control command based on signal qualities of the two consecutive slots; and transmitting the transmit power control command in only a first transmit power control field that is firstly available after the transmit power control command is determined.