Cross-Cell C-RNTI Configuration for Inter-Cell Mobility
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Solution Overview
Problem
Current 3GPP networks face challenges in efficiently managing cross-cell radio network temporary identifiers (C-RNTIs) for inter-cell mobility and multi-TRP operations, particularly in lower layer signaling, which affects seamless handovers and resource allocation between cells.
Innovation Solution
The implementation of cross-cell C-RNTI configuration and lower layer control signaling for C-RNTI indication, allowing for absolute, differential, or offset-based C-RNTI calculations, and dynamic indication using RRC signaling, MAC CE, or DCI to associate C-RNTIs with physical cell identities (PCIs) across cells, facilitating efficient inter-cell mobility and multi-TRP operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-cell C-RNTI configuration is implemented for inter-cell mobility, then handover efficiency is improved, but signaling complexity increases
Solution Approach 1:
The patent pre-configures C-RNTI values and their associations with neighbor cell PCIs before handover occurs. The UE receives and stores C-RNTI configuration information including absolute values, differential values, and offset values along with their corresponding PCIs in advance, so that when handover is triggered, the UE can immediately use the pre-configured C-RNTI without additional signaling delays.
Solution Approach 2:
The patent introduces an intermediary mapping relationship between C-RNTI values and neighbor cell PCIs. This mapping table acts as a mediator that allows the network to indicate target cell identity through PCI without requiring direct C-RNTI assignment signaling, thereby reducing handover signaling overhead while maintaining efficient cell identification.
2Adaptability or versatility
If dynamic C-RNTI indication is used for multi-TRP operations, then resource allocation flexibility is improved, but processing overhead increases
Solution Approach 1:
The patent enables dynamic indication of C-RNTI parameters (absolute values, differential values, offset values) through lower layer signaling mechanisms including RRC signaling, MAC CE, and DCI. These parameter changes allow the network to flexibly allocate resources for multi-TRP operations by dynamically adjusting C-RNTI assignments based on current network conditions and UE requirements.
Solution Approach 2:
The patent implements selective C-RNTI indication mechanisms where the network can indicate only the necessary C-RNTI parameters for current operations rather than full reconfiguration. For example, using MAC CE for urgent resource allocation changes or DCI for immediate multi-TRP switching, thereby achieving flexibility with minimal processing overhead by applying the appropriate level of action.
3Adaptability or versatility
If multiple C-RNTI calculation methods are supported, then network compatibility is improved, but implementation complexity increases
Solution Approach 1:
The patent implements a universal C-RNTI configuration framework that supports multiple calculation methods (absolute values, differential values, offset values) within a unified structure. The UE is configured with a mapping table that can accommodate all three calculation methods, allowing the same infrastructure to work across different network scenarios and legacy compatibility requirements without requiring separate implementation paths.
Solution Approach 2:
The patent enables the UE to self-determine the appropriate C-RNTI calculation method based on the configuration received from the network. The UE autonomously processes the indicated method (absolute, differential, or offset) and performs the corresponding calculation without requiring additional network control or complex external coordination, thereby managing implementation complexity through self-service processing.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods for cross-cell indication of radio network temporary identifiers or mobility based on bandwidth part switching.