Cross-cell reference signal beam mapping and measurements

By creating a mapping between serving and non-serving cell RSs based on past measurements, the solution addresses unnecessary CSI-RS transmissions and measurements, enhancing mobility efficiency in wireless networks.

WO2025214715A1 Publication Date: 2025-10-16NOKIA TECHNOLOGIES OY
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Patent Information

Application Number
PCT/EP2025/057085
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-04-10
Filing Date
2025-03-14
Publication Date
2025-10-16

AI Technical Summary

Technical Problem

In L1/2 inter-cell mobility scenarios, existing technologies require all Channel State Information Reference Signals (CSI-RS) to be transmitted and measured by UEs, even when they are not needed, leading to unnecessary transmissions and measurements, which can be a limiting factor due to multiple potential target cells.

Method used

A mapping is created between the RSs of the serving cell and the non-serving cell based on past measurements, allowing the UE to measure only the most relevant RSs of the non-serving cell, reducing unnecessary measurements by using a one-to-one, one-to-many, many-to-one, or many-to-many mapping.

Benefits of technology

This approach reduces unnecessary RS measurements by configuring the UE to measure only the most relevant RSs, optimizing resource usage and improving mobility efficiency in wireless communication networks.

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Abstract

A technical solution is provided, which allows reducing unnecessary Reference Signal (RS) transmissions and configurations associated with each target or non-serving cell, resulting in a reduction in unnecessary RS measurements performed by UEs For this purpose, a mapping is used, which associates each RS of a serving cell with one or more RSs of each non-serving cell. The mapping may be created by a network node based on past RS measurements relating to previous handover events, or a UE may be configured by the network node to do so. By using the mapping, the UE determines which RS(s) of each non-serving cell is(are) associated with the strongest RS(s) of the serving cell, whereupon the UE starts performing measurements on each of the determined RSs of the non-serving cell. In one other alternative embodiment, the mapping created by the network node is provided to another network node rather than the UE, and said another network node configures and broadcasts only those RSs which are associated with the strongest RS(s) of the serving cell.
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