Conditional Handover Skipping Confirmation Messages
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Solution Overview
Problem
Handovers in LTE and NR networks often fail due to poor radio conditions, leading to service interruptions and radio link failures, as the network struggles to detect measurement reports and send handover commands effectively, especially when radio conditions deteriorate rapidly.
Innovation Solution
Implementing a conditional handover mechanism that allows the UE to skip the message confirming completion of conditional handover configuration if the triggering condition is met before the configuration is complete, enabling faster handover execution without delaying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE sends a message confirming completion of conditional handover configuration, then the network can track handover progress, but the handover execution is delayed when radio conditions deteriorate rapidly
Solution Approach 1:
The patent applies preliminary action by pre-configuring the conditional handover command with all necessary parameters and conditions before the actual handover execution. The UE receives and stores the conditional handover configuration in advance, including target cell information, execution conditions, and resource allocations. When the triggering condition is met, the handover can be executed immediately without waiting for additional network commands or confirmation messages, thus reducing handover execution time while maintaining reliability through pre-validated configuration.
2Reliability
If the network sends handover command in poor radio conditions, then the handover can be initiated, but the message may be lost or require retransmission
Solution Approach 1:
The patent implements preliminary action by sending the conditional handover command when radio conditions are still acceptable, before deterioration occurs. The command includes all necessary execution parameters pre-configured. The UE stores this command and executes it automatically when triggering conditions are met, eliminating the need for real-time command transmission during poor radio conditions and avoiding message loss or retransmission delays.
Solution Approach 2:
The patent uses the conditional handover configuration message as an intermediary that carries all necessary handover parameters and conditions. This single pre-sent message serves as a complete handover package that the UE can execute autonomously when conditions are met, without requiring additional real-time communication during the actual handover execution, thus bypassing the problems of message loss in poor radio conditions.
3Reliability
If the UE waits for configuration completion before executing handover, then the handover can be executed with full configuration, but service interruptions increase
Solution Approach 1:
The patent applies preliminary action by providing the complete handover configuration to the UE in advance through the conditional handover command. The configuration includes all necessary parameters, target cell information, and resource allocations. The UE stores this complete configuration and executes it immediately when triggering conditions are met, without waiting for configuration completion procedures. This eliminates service interruptions while ensuring complete handover execution through pre-delivered configuration.
Data Source
AI summary
The invention refers to a method, in a wireless device operating in a wireless communication network, the method comprising: receiving, from a source node, a conditional handover command, the conditional handover command including or being associated with a triggering condition for execution of handover to a target cell or target beam; detecting, that the triggering condition is met; if a conditional handover configuration is not yet completed, executing the handover to the target cell or beam without sending a message confirming completion of a conditional handover configuration to the source node, and otherwise sending the message confirming completion of the conditional handover configuration to the source node; the invention further relates to a corresponding wireless device.