Conditional Handover Configuration Modification
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Solution Overview
Problem
Current systems for conditional handover in LTE and NR face challenges such as delayed handover commands due to poor radio conditions, unclear measurement configuration modifications, and potential configuration mismatches between UE and network, leading to unnecessary actions and battery drain.
Innovation Solution
The method involves a wireless device receiving an indication to modify a conditional handover configuration, replacing associated measurement identifiers, and stopping monitoring for trigger conditions to avoid executing unnecessary handovers, allowing for simplified configuration management and battery conservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network sends HO command early when radio conditions are still stable, then mobility robustness is improved, but the UE may execute unnecessary handovers if conditions change before execution
Solution Approach 1:
The patent implements dynamic conditional handover by allowing the network to modify CHO configurations (measurement identifiers, thresholds, target cell parameters) after initial setup. The UE continuously monitors trigger conditions and can update its handover decision based on current radio conditions, making the handover process adaptive rather than static.
Solution Approach 2:
The network maintains the ability to send modification commands to the UE regarding CHO configurations. The UE provides feedback through measurement reports and handover execution status, allowing the network to adjust or cancel conditional handovers based on changing conditions, creating a closed-loop control system.
2Measurement precision
If the network modifies measurement configuration after CHO setup, then measurement accuracy is improved, but configuration mismatches between UE and network may occur
Solution Approach 1:
The patent establishes a feedback mechanism where the network sends modification commands to the UE when measurement configurations need updating. The UE acknowledges receipt and application of these modifications, ensuring both sides maintain consistent configuration state and preventing mismatches.
Solution Approach 2:
The network proactively sends measurement configuration modifications to the UE before they are needed for handover execution. This preliminary update ensures the UE has the latest measurement parameters (identifiers, thresholds, objects) ready, improving measurement accuracy without causing configuration conflicts.
3Speed
If the UE continues monitoring trigger conditions after configuration modification indication, then handover execution remains responsive, but unnecessary handover actions may be executed
Solution Approach 1:
The patent makes the UE's trigger condition monitoring dynamic by allowing it to adjust based on received modification indications. When the network sends a configuration modification, the UE updates its monitoring parameters accordingly, maintaining responsive handover execution while avoiding triggers based on outdated configurations.
Solution Approach 2:
The network modifies key parameters of the trigger conditions (measurement identifiers, thresholds, reporting criteria) when sending configuration updates. The UE applies these parameter changes to its monitoring process, ensuring that handover decisions are based on current, accurate conditions rather than stale configurations.
4Adaptability or versatility
If multiple CHO candidate configurations are provided to UE, then handover flexibility is improved, but device complexity and battery consumption increase
Solution Approach 1:
The patent segments the CHO configuration into multiple independent candidate entries, each with its own target cell, trigger conditions, and execution parameters. The UE can manage these segmented configurations separately, reducing overall complexity compared to a single monolithic handover configuration.
Solution Approach 2:
The network can dynamically add, modify, or remove CHO candidate configurations based on current network conditions and UE capabilities. This dynamic management allows the system to provide high handover flexibility when needed while reducing configuration complexity when fewer candidates are appropriate, adapting to varying operational requirements.
Data Source
AI summary
A method by a wireless device includes receiving, from a network node, an indication identifying at least a first configuration identifier for modification. The first configuration identifier is associated with a conditional reconfiguration. The wireless device replaces at least a portion of the conditional reconfiguration based on the indication. The wireless devices determines that the first configuration identifier is associated with at least a first trigger condition for performing a conditional handover and stops monitoring for the first trigger condition.