Candidate-Cell CSI Resource Configuration for Inter-CU LTM Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in configuring channel state information (CSI) resources for candidate cells during lower layer triggered mobility (LTM), particularly in inter-CU scenarios, leading to inadequate handover performance of user equipment (UE) between central units (CUs).
Innovation Solution
The proposed solution involves a source CU generating an LTM CSI resource configuration for candidate cells based on measurement reports, transmitting an LTM preparation request to a candidate CU, and receiving LTM RRC configurations, enabling efficient CSI resource and report configurations for inter-CU LTM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI resource configuration is implemented for candidate cells during LTM, then handover performance is improved, but system complexity increases
Solution Approach 1:
The source CU generates LTM CSI resource configuration for candidate cells in advance before handover execution. The configuration includes CSI-RS resources, measurement reporting settings, and evaluation criteria that are prepared beforehand, enabling smooth handover without real-time computational delays.
Solution Approach 2:
The patent introduces an intermediary configuration message structure that carries LTM CSI resource configuration between source and candidate CUs. This standardized intermediary format simplifies the complexity of inter-CU coordination by providing a clear template for configuration exchange.
2Measurement precision
If measurement reports are collected from UEs for candidate cells, then handover decision accuracy is improved, but information processing load increases
Solution Approach 1:
The system collects measurement reports selectively based on local conditions at each candidate cell. Not all cells require the same measurement depth - the configuration allows differential measurement strategies where only necessary cells undergo full measurement procedures, reducing overall processing load while maintaining decision accuracy.
Solution Approach 2:
The LTM configuration enables dynamic adjustment of measurement parameters such as measurement frequency, reporting thresholds, and evaluation criteria based on current network conditions and UE requirements, optimizing the balance between measurement accuracy and processing efficiency.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a source central unit (CU) may receive, from a user equipment (UE), a measurement report. The source CU may generate a lower layer triggered mobility (LTM) channel state information (CSI) resource configuration for one or more candidate cells based at least in part on the measurement report. The source CU may transmit, to a candidate CU, an LTM preparation request that indicates the one or more candidate cells and the LTM CSI resource configuration. The source CU may receive, from the candidate CU, an LTM preparation response that indicates one or more LTM radio resource control (RRC) configurations associated with the one or more candidate cells, respectively. Numerous other aspects are described.