Target PCell/PSCell Measurement for Reduced Handover Delay
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Solution Overview
Problem
In wireless networks, the delay in handing over serving frequencies for terminal devices is increased due to the inability of the network to obtain timely measurement results of target PCell and PSCell frequencies, especially when there are restrictions on supported frequency band combinations for multi-radio dual connectivity.
Innovation Solution
The terminal device is configured to measure and report on both serving and non-serving frequencies, allowing the network to assess communication quality and reduce frequency handover delays by determining whether to switch to a non-serving frequency based on threshold-based measurement results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the network side changes PCell frequency or PSCell frequency, then frequency handover can be performed, but the network cannot obtain timely measurement results of target frequencies due to terminal device limitations
Solution Approach 1:
The terminal device measures and reports measurement results of non-serving frequencies in advance before the network actually needs to handover to those frequencies. This preliminary measurement and reporting enables the network to prepare handover configurations ahead of time, reducing the overall handover delay when frequency changes are required.
Solution Approach 2:
The terminal device provides feedback by reporting measurement results of both serving and non-serving frequencies to the network side. This feedback mechanism enables the network to make informed decisions about frequency handover based on real-time measurement data, improving the efficiency and timeliness of frequency coordination.
2Productivity
If the terminal device measures and reports measurement results of non-serving frequencies, then the network can reduce handover delay, but the terminal device complexity increases
Solution Approach 1:
Instead of requiring the terminal to measure all possible frequencies, the network configures the terminal to measure specific non-serving frequencies that are relevant for potential handover. This partial measurement approach reduces terminal complexity while still providing sufficient information for efficient handover decisions.
Solution Approach 2:
The measurement and reporting mechanism is designed to serve multiple purposes: it provides measurement data for current serving frequency optimization, prepares data for future handover decisions, and enables frequency coordination between MN and SN. This multi-functionality justifies the terminal device complexity by delivering multiple benefits from a single measurement system.
Data Source
AI summary
In a measurement method, a terminal device receives a first measurement configuration from a first network element, where the first measurement configuration indicates that the terminal device is to measure a first cell corresponding to a first frequency. The terminal device then sends a measurement report to the first network element, where the measurement report includes a first measurement result of measuring the first cell and a second measurement result of measuring a second cell corresponding to a second frequency, and the second frequency is at least one non-serving frequency different from the first frequency.