Random Access Power Control for Reliable Mobile Call Connection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In cellular communication systems, mobile stations are often disadvantaged due to a 10 dB power difference between downlink and uplink transmissions, leading to call connection degradation, especially when distant from the base station or in attenuated signal environments.
Innovation Solution
A method that dynamically adjusts the power output of a portable communication device's power amplifier based on the received signal strength, increasing power when weak and decreasing it when strong, to optimize call connection metrics during random access channel transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station uses maximum transmit power for random access channel transmission, then the call connection reliability is improved, but the power consumption increases and the battery life decreases
Solution Approach 1:
The patent implements dynamic power adjustment by continuously monitoring received signal strength indicators (RSSI) and adapting the transmit power level accordingly. The mobile station transitions from static maximum power transmission to dynamic power control, adjusting power in real-time based on channel conditions to maintain reliable connection while minimizing unnecessary power consumption.
Solution Approach 2:
The system employs feedback mechanisms where the mobile station monitors the received signal strength from the base station and uses this information to adjust its transmit power for random access channel transmissions. This closed-loop control ensures that power is optimized based on actual channel conditions, improving reliability when needed while reducing consumption when signal conditions are good.
2Reliability
If the mobile station increases transmit power to overcome uplink limitations, then the call connection metric is improved, but the device battery life is reduced
Solution Approach 1:
The patent changes the power parameter dynamically based on received signal strength measurements. Instead of using a fixed maximum power level, the system adjusts the transmit power parameter according to channel conditions, using higher power only when necessary to overcome uplink limitations and maintaining lower power when signal conditions permit, thereby extending battery life while preserving call connection metrics.
Solution Approach 2:
The mobile station performs preliminary assessment of the received signal strength before initiating random access channel transmission. Based on this preliminary measurement, the device determines the appropriate power level to use, avoiding unnecessary maximum power transmission and thereby conserving battery energy while ensuring sufficient power is available to maintain call connection metrics when needed.
3Reliability
If the mobile station transmits at maximum power during random access channel transmission, then the signal reaches the base station reliably, but the power amplifier operates inefficiently
Solution Approach 1:
The power amplifier operates dynamically rather than statically at maximum power. The system continuously adapts the amplifier's output power based on real-time channel conditions and received signal strength measurements, ensuring the amplifier operates at efficient power levels while maintaining reliable signal transmission to the base station.
Solution Approach 2:
The system uses feedback from received signal strength measurements to control power amplifier operation. The mobile station monitors the quality of received signals from the base station and adjusts the power amplifier's output accordingly, ensuring reliable transmission while avoiding inefficient operation at maximum power when lower power levels are sufficient.
Data Source
AI summary
A method for controlling an output of a power amplifier of a portable communication device includes determining a power level of a signal received at the portable communication device, generating a receive reference signal (RXLEV) that is indicative of the power level of the signal received at the portable communication device, and determining whether the receive reference signal is within a threshold value window. When the receive reference signal is within the threshold value window a nominal power output of a power amplifier in the portable communication device is transmitted during a random access channel signal transmission. When the receive reference signal is below the threshold value, a power output of the power amplifier in the portable communication device is increased during the random access channel signal transmission. When the receive reference signal is above the threshold value, a power output of the power amplifier in the portable communication device is decreased during the random access channel signal transmission.