Inter-Frequency SSB RSRP Reporting for L1/L2 Mobility Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel state information (CSI) for mobility enhancements, particularly in heterogeneous networks with varying cell sizes and technologies, leading to suboptimal handover and beam management processes.
Innovation Solution
Implementing a mechanism for layer 1/2 triggered mobility with early CSI reporting, utilizing RRC messages and beam management procedures to enhance mobility management in heterogeneous networks, including configurations for NR user plane and control plane protocol stacks, and integrating CSI-RSs for precise beam alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional CSI reporting mechanisms are used, then device complexity is reduced, but mobility management performance and handover efficiency deteriorate
Solution Approach 1:
The patent implements early CSI reporting where the UE reports CSI before the actual handover event occurs. The network receives advance information about channel conditions and can prepare handover parameters in advance, enabling faster and more accurate handover execution. This preliminary action allows the system to optimize mobility management by having forward-looking channel state information available before the handover is needed.
Solution Approach 2:
The patent establishes a feedback mechanism where the UE continuously reports CSI to the network node, and the network uses this feedback to make informed handover decisions. The feedback loop includes the UE measuring channel conditions, processing CSI, and transmitting reports to the network, which then adjusts handover parameters accordingly. This feedback mechanism enables adaptive mobility management that responds to actual channel conditions in real-time.
2Measurement precision
If early CSI reporting is implemented, then handover accuracy is improved, but latency increases
Solution Approach 1:
The patent performs CSI measurement and reporting in advance of the actual handover event. The UE measures channel conditions early and reports them to the network, allowing the network to prepare handover parameters before the handover is triggered. This preliminary action improves handover accuracy by having advance knowledge of channel conditions, while the system manages the resulting latency through efficient processing of early reports.
Solution Approach 2:
The patent implements dynamic CSI reporting where the reporting timing and frequency are adjusted based on network conditions and handover requirements. The system can switch between periodic and aperiodic reporting modes, and dynamically configure reporting triggers based on current channel conditions and mobility state. This dynamic approach optimizes the balance between measurement precision and latency by adapting the reporting mechanism to actual operational needs.
3Measurement precision
If comprehensive beam management procedures are implemented, then beam alignment precision is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent performs beam measurement and CSI acquisition in advance of the handover event. The UE measures beam characteristics and channel conditions early, and the network uses this advance information to pre-determine optimal beam configurations for the target cell. This preliminary beam management action improves alignment precision by having beam information available before handover, while the system manages complexity through efficient use of pre-acquired beam data.
Solution Approach 2:
The patent uses the CSI reporting mechanism to serve multiple functions: channel condition assessment, beam identification, handover decision-making, and beam alignment preparation. By making the CSI reporting system multi-functional, the patent reduces the need for separate dedicated beam management procedures, thereby improving beam alignment precision while controlling device complexity through functional consolidation.
Data Source
AI summary
A wireless device transmits radio resource control (RRC) messages comprising capability parameters indicating support, for a layer 1 and/or layer 2 triggered mobility (LTM) procedure and within a measurement window, for synchronization signal block (SSB) based inter-frequency layer 1 reference signal received power (RSRP) measurement of a candidate cell with a received time difference, between the candidate cell and a serving cell, larger than a cyclic prefix (CP) length. The device receives RRC messages indicating a measurement window. The device receives a command indicating an uplink transmission of a L1 RSRP report of the candidate cell. The first cell and the candidate cell are inter-frequency configured. The device transmits the L1 RSRP report measured over one or more first SSBs of the candidate cell. The first SSBs are received: via the candidate cell with the received time difference being greater than the CP length, and within the measurement window.