Transmission Antenna Path Switching Under SAR Power Limits
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Solution Overview
Problem
The challenge of antenna switching in electronic devices due to reduced relative difference of reference signal received power (RSRP) values when the maximum average power value exceeds specific absorption rate (SAR) limits, leading to potential call drops and mute phenomena.
Innovation Solution
An electronic device with multiple antennas and processors that selectively switches between them based on signal power and SAR compliance to maintain optimal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna switching is performed based on RSRP values, then transmission quality is improved, but when maximum average power is limited by SAR constraints, the RSRP difference between antennas becomes small making switching ineffective
Solution Approach 1:
The patent changes the switching criterion from RSRP values to maximum average power values. When SAR constraints are active, the processor selects the antenna capable of transmitting at higher maximum average power, thereby maintaining transmission quality even when RSRP differences are minimal. This parameter transformation resolves the contradiction by providing an effective switching mechanism under power-limited conditions.
2Productivity
If maximum transmit power is increased to improve data transmission rate, then productivity is improved, but SAR limits restrict the maximum average power that can be transmitted
Solution Approach 1:
The patent implements dynamic antenna selection based on real-time SAR constraints and maximum average power capabilities. The processor continuously evaluates which antenna can transmit at higher power levels without exceeding SAR limits, and switches accordingly. This dynamic approach maximizes data transmission rate while continuously adhering to SAR safety constraints.
Solution Approach 2:
The patent transforms the power transmission approach by focusing on maximum average power rather than peak power. By selecting antennas based on their maximum average power capability under SAR constraints, the system achieves optimal productivity within the harmful factor limits, effectively resolving the contradiction between transmission rate and SAR compliance.
3Device complexity
If the same antenna is used continuously, then device complexity is reduced, but call drops and mute phenomena occur when SAR limits are reached
Solution Approach 1:
The patent implements dynamic antenna switching that activates when SAR constraints are detected. The processor monitors power transmission levels and automatically switches to an alternative antenna when the current antenna approaches SAR limits. This dynamic mechanism prevents call drops and mute phenomena while maintaining relatively simple antenna management through automated decision-making.
Data Source
AI summary
An electronic device may comprise: a first antenna, a second antenna disposed at a location different from a location in which the first antenna is disposed, and a processor. The processor may, on the basis of the magnitude of the maximum average power of a signal output through the first antenna to satisfy a time average specific absorption rate (SAR) configured in the electronic device and the maximum transmit power limit of a signal output through at least one of the first antenna and the second antenna configured by a cellular network, select an antenna to output the signal, from among the first antenna and the second antenna. The processor may select an antenna to output a signal on the basis of a difference between the magnitude of the maximum average power of a signal output through the first antenna and the magnitude of the maximum average power of a signal output through the second antenna.