Power Density Exposure Control via Phase Difference
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G-NR mmW, face limitations in managing power density exposure due to the absence of specific requirements for relative phase shift between antenna ports, leading to assumptions of worst-case scenarios that restrict uplink transmission power and impact communication efficiency.
Innovation Solution
A user equipment (UE) determines the relative phase difference between transmit beams based on the beams and their power levels to optimize power density exposure, allowing for reduced or eliminated excessive exposure without assuming a worst-case scenario, thereby enhancing transmission power and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE assumes a worst-case scenario for power density exposure, then the UE can ensure compliance with safety limits, but the uplink transmission power is restricted and communication efficiency is reduced
Solution Approach 1:
The patent changes the parameter assumptions from worst-case scenarios to actual measured or calculated phase relationships. By using real phase difference measurements between antenna ports rather than assuming maximum possible phase differences, the system maintains safety compliance while allowing higher transmission powers that were previously restricted by conservative assumptions.
2Object-affected harmful factors
If the UE uses conservative worst-case assumptions for phase shift, then power density exposure is controlled, but transmission power is limited
Solution Approach 1:
The patent implements feedback mechanisms where the UE measures actual phase relationships between antenna ports and uses this information to adjust transmission parameters. This feedback loop replaces static worst-case assumptions with dynamic, measurement-based control, enabling the system to maintain exposure limits while optimizing transmission power based on actual conditions.
Solution Approach 2:
The patent performs preliminary measurements of phase relationships between antenna ports before transmission. By determining actual phase differences in advance rather than assuming worst-case values, the system can pre-calculate safe transmission power levels that comply with exposure limits, thereby enabling higher powers than would be permitted under conservative assumptions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may select two transmit beams from a plurality of beams that the UE is capable of forming using an antenna array of the UE that includes a plurality of antenna elements, wherein the two transmit beams are to be used to transmit two corresponding layers of information; determine, after selecting the two transmit beams, a phase difference to be applied to the two transmit beams based at least in part on the two transmit beams; and transmit the information on the two corresponding layers concurrently via the two transmit beams using the phase difference. Numerous other aspects are provided.