Target Secondary Node Signaling for Conditional PSCell Resource Release
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Solution Overview
Problem
In existing wireless communication systems, there is no standardized signaling or procedure for a target secondary node (T-SN) to cancel one or multiple candidate PSCells in a Conditional PSCell Change (CPC) scenario, especially when the target candidate SN is different from the source SN, leading to resource inefficiencies and potential failures due to unpredictable load conditions.
Innovation Solution
The proposed solution involves the T-SN or MN initiating a cancellation of the CPC configuration by sending a cancellation indication to the source SN or MN, which then generates an RRC Reconfiguration message to release the cancelled PSCell candidates, allowing resource optimization and adapting to changing network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the T-SN prepares CPC configuration for multiple candidate PSCells in advance, then the handover execution time is reduced and mobility robustness is improved, but the resource consumption increases and resource management flexibility decreases
Solution Approach 1:
The patent implements dynamic resource management for CPC configurations by allowing the T-SN to cancel prepared CPC configurations based on changing network conditions and load. The cancellation mechanism enables the system to adapt resource allocation dynamically - keeping CPC configurations when they are likely to be executed and canceling them when resources need to be freed, thus resolving the contradiction between advance preparation benefits and resource consumption costs.
2Reliability
If the T-SN maintains CPC configuration for potential handover targets, then the reliability of handover execution is improved, but the adaptability to changing network conditions deteriorates
Solution Approach 1:
The patent establishes a feedback mechanism where the T-SN monitors network conditions and sends cancellation indications to the source SN when conditions change. This feedback loop allows the system to maintain CPC configurations for reliability while adapting to changing network conditions by canceling configurations that are no longer appropriate, thus resolving the contradiction between reliability and adaptability.
3Reliability
If the source SN sends CPC configuration to UE early, then the handover robustness is improved by avoiding late HO command transmission, but the complexity of coordination between network nodes increases
Solution Approach 1:
The patent extracts the CPC cancellation function from the complex multi-node coordination process and implements it directly at the T-SN level. The T-SN independently decides when to cancel CPC configurations and sends cancellation indications to the source SN, simplifying the coordination complexity while maintaining early configuration benefits for handover robustness.
Data Source
AI summary
A method (800) performed by a T-SN for cancelling a conditional PSCell, change (CPC). The method includes the T-SN receiving (s802) a request for a CPC configuration for a UE, wherein the request was transmitted by a first network node (NN), and the UE is connected to the first NN and is also connected to a second NN. The method also includes the T-SM transmitting (s804) to the first NN a response to the request, the response including the CPC configuration for the UE. The method further includes, after transmitting the response, the T-SN transmitting (s806) to the first NN a cancellation indication indicating that the CPC configuration for the UE is cancelled.