Power Headroom Adjustment for Simultaneous LTE NR Transmission
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Solution Overview
Problem
In 5G communication systems, user equipment (UE) that do not support dynamic power sharing (DPS) face performance issues due to fallback into a time division multiplexing (TDM) mode when the sum of configured power for LTE and NR transmission exceeds the total power, leading to underutilization of power and increased latency, particularly affecting ultra-reliable low latency communications (URLLC) services.
Innovation Solution
A method and system for modifying power headroom reporting in UE to ensure it remains within the maximum transmit power limits, allowing for simultaneous LTE and NR transmission by determining the required transmit power and adjusting the power headroom or delaying reports to the base station, thereby enabling efficient power management and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE falls back into SUO mode based on TDM pattern when PLTE+PNR>Ptotal, then the UE ensures power limits are not exceeded, but the UE performance deteriorates due to inability to transmit on both LTE and NR simultaneously
Solution Approach 1:
The patent implements dynamic power headroom adjustment where the UE modifies its power headroom reporting based on service requirements. When URLLC services are detected, the UE adjusts power headroom values dynamically to enable simultaneous LTE and NR transmission while maintaining power limit compliance, transitioning from static TDM-based SUO mode to dynamic power management.
Solution Approach 2:
The UE changes the power headroom parameter dynamically based on service type detection. When URLLC services are identified, the UE modifies power headroom values to reflect the need for simultaneous transmission capability, allowing the system to transition from conservative TDM operation to more aggressive parallel transmission while maintaining power constraints.
2Use of energy by moving object
If the UE uses TDM pattern for single uplink transmission, then the UE manages power consumption, but the user plane and control plane latency increase particularly affecting URLLC services
Solution Approach 1:
The system dynamically switches between TDM-based power management and simultaneous transmission modes based on service requirements. For URLLC services with strict latency requirements, the UE detects the service type and adjusts power headroom reporting to enable simultaneous LTE and NR uplink transmission, reducing latency while maintaining acceptable power consumption through intelligent power allocation.
Solution Approach 2:
The UE implements feedback mechanisms by monitoring service requirements and adjusting power headroom reporting accordingly. When URLLC services are detected, the feedback loop triggers power headroom modification to enable simultaneous transmission, creating a closed-loop system that balances power consumption against latency requirements based on real-time service conditions.
3Adaptability or versatility
If the UE configures power for both LTE and NR transmission, then the UE can provide diverse services, but the sum of configured power exceeds total UE power when DPS is not supported
Solution Approach 1:
The patent enables dynamic power headroom adjustment that allows the UE to configure power for both LTE and NR transmissions simultaneously when URLLC services are detected. The system dynamically modifies power headroom reporting to reflect the combined power requirements, enabling service diversity while managing total power consumption through intelligent allocation rather than static TDM-based power management.
Solution Approach 2:
The UE changes power headroom parameters dynamically based on the combination of services being provided. When both LTE and NR transmissions are configured for diverse service support, the UE adjusts power headroom values to accommodate the combined power requirements, allowing the system to maintain versatile service capability while staying within total power constraints through parameter adaptation.
Data Source
AI summary
The disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as long term evolution (LTE). The disclosure provides a method for sending a power headroom report (PHR) to a base station in a multi-rat dual connectivity (MR-DC) deployment in a UE (100). The method comprises determining, by the UE (100), that a transmit power required is greater than a maximum transmit power of the UE (100) and determining, by the UE (100), a PHR reporting criteria is met. The method also includes performing, by the UE (100) at least one of: modifying the power headroom such that the transmit power is less than or equal to the maximum transit power of the UE (100); modifying the maximum transmit power such that the power headroom report indicates that the transmit power required is less than or equal to the maximum transmit power and triggering the power headroom report to the base station; and delaying the triggering and reporting of PHR to the base station.