HPUE Uplink Power Limiting for EN-DC SAR Compliance
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Solution Overview
Problem
Current standards have not determined a Specific Absorption Rate (SAR) protection mechanism for High Power User Equipment (HPUE) supporting E-UTRA-NR Dual Connectivity (EN-DC) in different DC frequency band combinations and maximum transmit power combinations, particularly for LTE TDD+NR TDD and LTE FDD+NR TDD scenarios, leading to undefined terminal behavior and potential electromagnetic radiation risks.
Innovation Solution
A method and device for HPUE to dynamically determine and adjust uplink transmission configurations based on transmit power radiation limitation policies, considering duplex mode combinations and maximum transmit power combinations, using Time Division Multiplexing (TDM) patterns and uplink duty cycles to ensure SAR compliance, involving capability reporting and base station scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HPUE supports multiple DC frequency band combinations and maximum transmit power combinations, then the adaptability and versatility of the terminal is improved, but the electromagnetic radiation control becomes more complex and SAR protection mechanisms are not yet determined
Solution Approach 1:
The patent segments the transmission power control into separate components for LTE and NR frequencies. It defines separate maximum transmit powers (P_MAX_LTE and P_MAX_NR) for each frequency band combination, allowing independent control and simplification of the overall SAR protection mechanism while supporting multiple band combinations.
Solution Approach 2:
The patent changes the control parameters by introducing specific parameters for maximum transmit power in LTE (P_MAX_LTE) and NR (P_MAX_NR) frequency bands. These parameters are adjusted based on the specific DC frequency band combination and duplex mode, enabling precise control of electromagnetic radiation for each scenario.
2Adaptability or versatility
If dynamic adjustment of uplink transmission configuration is implemented, then the electromagnetic radiation management becomes more flexible, but the device complexity and control mechanisms increase
Solution Approach 1:
The patent implements dynamic adjustment of uplink transmission configuration by allowing the terminal to adaptively select and adjust transmission parameters based on current operating conditions. The uplink transmission configuration is dynamically modified according to the determined transmit power radiation limitation policy, enabling flexible control while maintaining manageable complexity through standardized procedures.
3Manufacturing precision
If different transmission limitation rules are formulated for different frequency band combinations, then the SAR protection precision is improved, but the device complexity and configuration management increase
Solution Approach 1:
The patent applies local quality by formulating specific transmission limitation rules for each DC frequency band combination and duplex mode scenario. Each frequency band combination (e.g., LTE TDD+NR TDD, LTE FDD+NR TDD) has its own tailored limitation policy, ensuring precise SAR protection for each specific scenario while maintaining overall system manageability.
Data Source
AI summary
Disclosed in embodiments of the present disclosure are a method for limiting uplink transmit power radiation and a related device. The method is applied to a HPUE supporting a DC mode. The DC mode refers to dual connectivity based on a DC frequency band combination. The DC frequency band combination comprises a Long Term Evolution (LTE) frequency band and a New Radio (NR) frequency band. The method includes: determining a transmit power radiation limitation policy of the HPUE in the DC mode; and adjusting an uplink transmission configuration of the HPUE according to the transmit power radiation limitation policy. The uplink transmission configuration includes a TDM pattern for the DC frequency band combination or a maximum uplink duty cycle of at least one of the LTE frequency band or the NR frequency band in the DC frequency band combination.