UE Measurement Report Filtering for LTE-NR Handover Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and NR networks, there is a challenge in efficiently managing signal measurements to prevent handovers to cells with poor signal quality, leading to potential connection failures and suboptimal network performance.
Innovation Solution
A method where user equipment (UE) receives signals from both LTE and NR cells, determines if signal measurements meet specific threshold conditions, and transmits a measurement report that excludes measurements from cells with poor signal quality, preventing handovers to those cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE includes all signal measurements in the measurement report, then the network has complete information for handover decisions, but the network may handover to cells with poor signal quality causing connection failures
Solution Approach 1:
The UE extracts and excludes measurements from cells that do not meet minimum quality thresholds (RSRQ and SINR conditions) from the measurement report. This selective exclusion prevents poor-quality cell measurements from being reported to the network, thereby avoiding handovers to inadequate cells while still reporting measurements from acceptable cells.
Solution Approach 2:
The UE provides feedback to the network about signal quality conditions by conditionally including or excluding measurements based on RSRQ and SINR thresholds. This feedback mechanism allows the network to make informed handover decisions based only on measurements that indicate acceptable signal quality, improving handover reliability.
2Reliability
If the UE transmits all measurement data, then the network can make accurate handover decisions, but handovers may still be triggered to cells with poor RSRQ and SINR leading to connection failures
Solution Approach 1:
The UE performs preliminary evaluation of measurement quality against RSRQ and SINR thresholds before including measurements in the report. This preliminary filtering action ensures that only measurements from cells with acceptable signal quality are reported, preventing failed handovers before they occur.
3Reliability
If the UE excludes measurements from the measurement report, then handovers to poor quality cells are prevented, but the network loses information about all measured cells including those with good signal quality
Solution Approach 1:
The UE selectively extracts and excludes only those measurements that fail to meet the RSRQ and SINR quality conditions, while retaining and reporting measurements from cells that satisfy the conditions. This selective extraction maintains network stability by excluding poor-quality measurements while preserving useful information about acceptable cells.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a first signal associated with a first radio access technology (RAT) and a second signal associated with a second RAT. The UE may determine that first signal measurements associated with the first signal satisfy a first condition and second signal measurements associated with the second signal satisfy a second condition. The UE may transmit, to a first base station associated with the first RAT, a measurement report that excludes the first signal measurements and the second signal measurements based at least in part on the first condition and the second condition being satisfied. Numerous other aspects are described.