Communication Device Random Access Power Control
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Solution Overview
Problem
Existing wireless communication systems consume excessive power when a user apparatus repeatedly attempts to establish a connection to a base station using different beams, due to failed initial connection attempts.
Innovation Solution
A communication device that measures the reception-signal level and decides the optimal transmission power and number of transmission attempts for random access to a base station, based on the signal level and the gain difference between the reception and transmission frequency bands of the antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user apparatus repeatedly starts random access using different beams to establish connection to the base station, then the connection establishment reliability is improved, but the power consumption increases
Solution Approach 1:
The user apparatus performs reception signal level measurement and path loss calculation before initiating random access transmission. This preliminary action allows the device to determine the optimal transmission power in advance, reducing the need for repeated high-power transmission attempts and thereby lowering overall power consumption while maintaining connection establishment reliability
Solution Approach 2:
The transmission power parameter is dynamically adjusted based on the calculated path loss and reception signal level. By changing the transmission power parameter to match the actual channel conditions, the system achieves reliable connection establishment with minimal power consumption, avoiding both excessive power usage and transmission failures
2Reliability
If the user apparatus uses a fixed high transmission power for random access, then the connection establishment success rate is improved, but the power consumption increases and unnecessary interference is caused
Solution Approach 1:
The transmission power is dynamically calculated based on path loss and reception signal level measurements. This parameter change approach ensures that the transmission power is exactly sufficient for successful random access without being excessively high, thereby improving success rate while minimizing power consumption and interference
Solution Approach 2:
The system uses feedback from reception signal level measurements to adjust transmission power. By measuring the reception signal level and calculating path loss, the system determines the appropriate transmission power level, ensuring successful connection establishment with minimal power consumption and avoiding unnecessary interference to other users
Data Source
AI summary
Provided is a communication device which includes a communication section that receives, via a transceiving antenna, a reference signal to be transmitted from a base station, a measurement section that measures a reception-signal level on a basis of the reference signal received by the communication section, and a decision section that decides at least one of a transmission power or a number of times of transmission for starting random access to the base station, on a basis of the reception-signal level measured by the measurement section, and a difference between a gain in a reception frequency band of the transceiving antenna and a gain in a transmission frequency band of the transceiving antenna.