Power Headroom Report for Multi-RAT Interworking
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Solution Overview
Problem
Current multi-RAT user equipment cannot simultaneously access and transmit data through multiple radio access technologies, leading to inefficiencies in power management and interworking between wireless LAN and cellular networks, with no established method for reporting power headroom in such scenarios.
Innovation Solution
A method for user equipment to transmit a power headroom report when accessing both a cellular and a wireless LAN system, including information on maximum transmit power and actual power strength, triggered by conditions such as activation or data transmission, to efficiently manage power in interworking communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multi-RAT UE transmits data via multiple communication systems simultaneously, then system efficiency and data transmission capability are improved, but power management complexity increases and no established reporting method exists
Solution Approach 1:
The power headroom report is segmented into multiple components: first power headroom information for the first communication system, second power headroom information for the second communication system, and maximum power information. This segmentation allows the UE to report power status for each system separately, simplifying the power management complexity while maintaining the ability to transmit data through multiple systems simultaneously.
Solution Approach 2:
The patent introduces a new dimension for power reporting by including maximum power information that indicates the relationship between maximum power for simultaneous transmission and the sum of maximum powers for individual systems. This additional dimensional information enables the network to understand power allocation constraints without increasing UE complexity.
2Reliability
If power headroom reporting is implemented for simultaneous multi-RAT access, then power control efficiency is improved, but signaling overhead and protocol complexity increase
Solution Approach 1:
The power headroom report structure is designed to be universal and adaptable. It can function whether the UE is transmitting data through one system or multiple systems simultaneously. The report includes fields that are conditionally populated based on the transmission scenario, allowing the same reporting mechanism to serve multiple purposes without requiring separate protocols for different cases.
Solution Approach 2:
The patent dynamically changes reporting parameters based on the transmission scenario. When simultaneous multi-RAT transmission occurs, the report includes second power headroom information and maximum power information. When transmitting through a single system, these additional fields are omitted. This parameter adaptation reduces signaling overhead while maintaining power control efficiency.
3Ease of operation
If maximum power is fixed for multi-RAT UE, then device simplicity is maintained, but power utilization efficiency decreases when simultaneous transmission is needed
Solution Approach 1:
The maximum power configuration is made dynamic rather than fixed. The network can configure different maximum power values based on whether the UE is transmitting through one system or multiple systems simultaneously. The power headroom report includes maximum power information that reflects the current transmission scenario, allowing the UE to utilize power efficiently while maintaining simple device operation through network-controlled configuration.
Data Source
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AI summary
A method for a terminal in a first communication system to transmit a power headroom report in a network supporting interworking of a plurality of communication systems comprises a step for transmitting a power headroom report comprising a power headroom value related to a second communication system, when a predetermined triggering condition occurs in a state in which the terminal is accessing the first and second communication systems simultaneously, wherein the power headroom report can comprise information regarding maximum transmission power for the second communication system.