Wireless Node PSCell Change Under SCG Activation States
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Solution Overview
Problem
The 3GPP has not agreed upon a clear definition for simultaneously implementing Conditional PSCell Change (CPC) and SCG Activation/De-activation mechanisms, leading to potential complexity and power consumption issues in dual-connectivity scenarios.
Innovation Solution
A unified solution is proposed for various connectivity scenarios, including dual- and single-connectivity, which optimizes the configuration of CPC and SCG Activation/De-activation by setting conditions for CPC application in SCG De-activation status, avoiding unnecessary power consumption and random-access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CPC and SCG Activation/De-activation mechanisms are configured simultaneously, then the quality of DC link is guaranteed during UE transition, but the system complexity and power consumption increase
Solution Approach 1:
The patent changes the parameter of SCG status (activation/deactivation) to control whether CPC procedures are executed. By monitoring the SCG activation status parameter, the system selectively applies CPC only when SCG is activated, thereby maintaining DC link quality during transitions while avoiding unnecessary complexity when SCG is deactivated.
Solution Approach 2:
The patent introduces dynamic behavior by making CPC execution conditional on the current SCG activation status. The system dynamically adjusts its operation mode based on whether SCG is activated or deactivated, allowing flexible adaptation to different operational states without requiring separate static configurations for each scenario.
2Reliability
If SCG is activated during CPC to ensure proper handover execution, then handover reliability improves, but power consumption increases
Solution Approach 1:
The patent applies partial action by selectively executing CPC procedures only when SCG is in activated status. When SCG is deactivated, CPC is skipped entirely, avoiding unnecessary power consumption from random-access procedures and handover execution that would not be beneficial in the deactivated state.
Solution Approach 2:
The system uses the existing SCG activation status as a self-indicating condition that automatically determines whether CPC should proceed. The SCG status itself serves as the decision criterion, eliminating the need for additional signaling or external control to determine whether handover procedures should be initiated.
3Adaptability or versatility
If CPC is allowed in SCG De-activation status without restrictions, then connectivity flexibility improves, but unnecessary CPC procedures and power consumption occur
Solution Approach 1:
The patent applies preliminary anti-action by preemptively preventing CPC execution when SCG is in deactivated status. By checking the SCG activation status before allowing CPC, the system blocks unnecessary CPC procedures in advance, avoiding the power consumption and signaling overhead that would result from executing handover procedures when SCG resources are not available.
Data Source
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Figure 5A
AI summary
The present disclosure disclosed a method and a device used in a communication node for wireless communications. A communication node receives a first signaling; when the first cell is in a first state, as a response to the first condition being fulfilled, the node applies a first sub-configuration to the first target cell and transmits a second signaling, and does not transmit a first message on the first target cell; when the first cell is in a second state, as a response to the first condition being fulfilled, the node applies the first configuration to the first target cell and starts a first timer, and transmits a second signaling, transmits a first message on the first target cell, and receives a second message, and, as a response to receiving the second message, stops the first timer; the first signaling comprises an RRC reconfiguration message; the first configuration and the first condition are associated with the first target cell; the second signaling indicates the first target cell; the first message is used for random access.