Terminal Signal Measurement Priority for Stable Cellular Handover
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Solution Overview
Problem
In cellular communication systems, terminal apparatuses face challenges in appropriately controlling measurement methods of reference signals, leading to repeated handovers and increased network resource consumption due to differing measurement methods based on connected states (RRC_Connected, RRC_Idle, RRC_Inactive), which results in inefficient mobility control.
Innovation Solution
A terminal apparatus is configured to receive notification signals indicating priorities for multiple measurement methods (SS-RSRP, SS-RSRQ, SS-SINR) and select the appropriate method(s) based on these priorities, enabling consistent measurement and handover control across different states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal apparatus uses different measurement methods depending on connected state (RRC_Connected, RRC_Idle, RRC_Inactive), then the measurement process adapts to different operational modes, but measurement consistency deteriorates leading to repeated handovers and inefficient mobility control
Solution Approach 1:
The patent implements dynamic selection of measurement methods based on the connected state between terminal and base station. The terminal dynamically switches between first measurement method (in connected state), second measurement method (in idle state), and third measurement method (in inactive state) according to real-time connection status, ensuring optimal measurement performance for each operational mode while maintaining overall system reliability
Solution Approach 2:
The patent changes measurement parameters (measurement method type) based on the connected state parameter. When the connection state changes between RRC_Connected, RRC_Idle, and RRC_Inactive, the terminal adjusts the measurement method accordingly, transforming the measurement approach to match the current operational context and prevent inconsistent handover decisions
2Adaptability or versatility
If the terminal apparatus performs handover based on measurement results from different measurement methods, then mobility control flexibility increases, but handover accuracy deteriorates causing handovers to cells with high interference
Solution Approach 1:
The patent applies different measurement methods (first, second, or third) based on connected state to maintain measurement precision. Each measurement method is optimized for specific connection scenarios, ensuring accurate signal quality assessment regardless of whether the terminal is in connected, idle, or inactive state, thereby preventing inaccurate handover decisions to high-interference cells
Solution Approach 2:
The patent incorporates feedback mechanisms where the terminal continuously monitors measurement results and connection state, adjusting measurement methodology based on observed conditions. This feedback loop ensures that handover decisions are based on accurate, context-appropriate measurements rather than inconsistent data from mismatched measurement methods
3Speed
If the terminal apparatus autonomously selects measurement methods without base station control, then measurement responsiveness improves, but measurement appropriateness deteriorates leading to inappropriate mobility control
Solution Approach 1:
The patent implements feedback control where the base station receives measurement results from the terminal and provides control instructions back to the terminal. This closed-loop feedback mechanism ensures that while the terminal can quickly perform measurements, the overall measurement strategy remains appropriate and controlled, preventing autonomous decisions that could lead to inappropriate mobility control
Solution Approach 2:
The patent applies preliminary control actions from the base station regarding measurement configuration and methodology selection. The base station pre-establishes measurement parameters and methods based on network conditions and terminal capabilities, allowing the terminal to execute measurements quickly while ensuring appropriateness through pre-planned measurement strategies
Data Source
AI summary
A terminal apparatus performs: receiving a notification signal from a base station apparatus, the notification signal including information indicating respective priorities for at least one of a first measurement method for measuring received power of a reference signal, a second measurement method for measuring reception quality of the reference signal based on a ratio of a signal strength of the reference signal to a signal strength of a predetermined resource including a resource where the reference signal is transmitted, and a third measurement method for measuring a signal-to-noise ratio of the reference signal; selecting at least one of the measurement methods based on the priorities; performing measurement of radio signals transmitted from the base station apparatus and another base station apparatus with the selected measurement method; and controlling connection with the base station apparatus according to a measurement result.