NR-SS and CSI-RS Measurement for Wireless Handover
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Solution Overview
Problem
The New Radio (NR) system lacks a defined concept for channel measurement and cell handover, as it does not utilize Cell-Specific Reference Signals (CRS) like LTE systems, necessitating alternative methods for measuring channel quality and managing beam alignment during handovers.
Innovation Solution
An electronic apparatus and method that measure New Radio Synchronized Signals (NR-SS) and Channel State Information Reference Signals (CSI-RS) from serving and target cells to generate comprehensive measurement reports, enabling accurate channel quality assessment and beam selection for efficient handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If CRS-based measurement method is used, then handover process is simple and defined, but NR system cannot accurately measure channel quality due to absence of CRS
Solution Approach 1:
The patent changes the measurement parameters from CRS-based to NR-SS and CSI-RS based. Specifically, it measures reference signal received power (RSRP) and reference signal received quality (RSRQ) using NR-SS, and adds channel state information (CSI) measurements using CSI-RS. This parameter change enables accurate channel quality measurement in NR system while maintaining handover functionality.
Solution Approach 2:
The patent makes the measurement system multi-functional by incorporating both NR-SS measurements (for synchronization and basic channel quality) and CSI-RS measurements (for detailed channel state information). This universal measurement approach serves multiple purposes: handover decision, beam management, and channel quality assessment, resolving the limitation of CRS absence.
2Device complexity
If only NR-SS measurement is performed, then measurement process is simple, but channel quality assessment is insufficient for accurate handover
Solution Approach 1:
The patent segments the measurement process into two distinct parts: NR-SS measurement for basic channel quality and synchronization, and CSI-RS measurement for detailed channel state information. This segmentation allows each measurement type to serve its specific purpose, with NR-SS providing foundational data and CSI-RS enhancing the accuracy for handover decisions, thereby improving reliability without excessive complexity.
Solution Approach 2:
The patent performs preliminary measurement configuration where the network side signals to the terminal which reference signals (NR-SS and/or CSI-RS) should be measured. This preliminary action allows the terminal to prepare measurement reports in advance, ensuring reliable handover decisions are made based on comprehensive channel quality information without increasing real-time measurement complexity.
3Measurement precision
If comprehensive measurement of both NR-SS and CSI-RS is performed, then channel quality measurement accuracy is improved, but measurement report size and signaling overhead increase
Solution Approach 1:
The patent applies local quality by measuring different reference signals in different contexts: NR-SS is measured for general channel quality assessment, while CSI-RS is measured specifically when detailed channel state information is needed. The measurement report includes only the necessary information based on the measurement configuration, avoiding unnecessary signaling overhead while maintaining accuracy where required.
Solution Approach 2:
The patent introduces dynamic measurement configuration where the network side can flexibly configure which reference signals (NR-SS, CSI-RS, or both) the terminal should measure based on current system conditions. This dynamic approach allows the system to adjust measurement scope and report content according to actual needs, balancing measurement accuracy with signaling overhead reduction.
Data Source
AI summary
Provided are an electronic device and a method for wireless communications, comprising a processing circuit configured to perform the following steps: according to an acquired measurement configuration, measuring a new radio synchronized signal (NR-SS) from a serving cell and one or more target cells to obtain a first measurement result; according to the measurement configuration, measuring a channel state information reference signal (CSI-RS) from the serving cell and the one or more target cells to obtain a second measurement result; and generating a measurement report comprising the first measurement result and the second measurement result.