User Apparatus Timing Difference Measurement Configuration
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Solution Overview
Problem
In LTE-NR dual connectivity, user apparatuses face challenges in measuring frame, slot, or symbol timing differences between master and secondary nodes due to the lack of established procedures for asynchronous dual connectivity measurements.
Innovation Solution
A user apparatus is provided with a reception unit to receive configuration for measuring timing differences between LTE and NR base stations, a control unit to perform measurements based on this configuration, and a transmission unit to report the results, including information on the upper limit of NR cells to be measured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the user apparatus performs measurements on all detected NR carriers in asynchronous dual connectivity, then the timing difference measurement accuracy is improved, but the measurement complexity and processing time increase significantly
Solution Approach 1:
The patent segments the measurement process by dividing NR carriers into two groups: synchronized carriers (measured using existing LTE-Sync procedures) and asynchronous carriers (measured using new procedures). This segmentation allows the system to apply different measurement approaches based on the synchronization status of each carrier, reducing overall complexity while maintaining measurement accuracy for asynchronous carriers.
Solution Approach 2:
The patent applies partial action by selectively performing detailed timing difference measurements only on asynchronous NR carriers rather than all detected carriers. The measurement configuration includes parameters that enable the UE to focus resources on measuring timing differences for carriers identified as asynchronous, avoiding unnecessary measurements on already-synchronized carriers.
2Reliability
If the user apparatus measures timing differences on multiple NR carriers simultaneously, then the dual connectivity synchronization is improved, but the power consumption and processing load increase
Solution Approach 1:
The patent implements dynamic measurement configuration where the UE adapts its measurement behavior based on the synchronization status of each NR carrier. The measurement configuration includes dynamic parameters that allow the UE to adjust measurement timing and resource allocation based on whether carriers are synchronized or asynchronous, optimizing power consumption while maintaining synchronization reliability.
Solution Approach 2:
The patent changes measurement parameters based on carrier synchronization status. Different measurement parameters (such as measurement timing, resource allocation, and reporting intervals) are applied to synchronized versus asynchronous carriers. This parameter differentiation allows the system to maintain reliable synchronization while reducing overall power consumption by applying less intensive measurement regimes to already-synchronized carriers.
3Measurement precision
If the network configures measurement for all detected second RAT cells, then the timing difference measurement completeness is improved, but the signaling overhead and configuration complexity increase
Solution Approach 1:
The patent extracts and separates the measurement configuration for asynchronous NR carriers from the general measurement configuration. The network identifies which NR carriers are asynchronous and provides specific measurement configurations only for those carriers, rather than configuring measurements for all detected second RAT cells. This extraction reduces signaling overhead while maintaining measurement completeness for the critical asynchronous carriers.
Solution Approach 2:
The patent applies preliminary action by having the network pre-identify and classify NR carriers as synchronized or asynchronous before configuring measurements. The network performs preliminary assessment of carrier synchronization status and prepares targeted measurement configurations in advance, reducing the need for extensive signaling during the measurement setup phase while ensuring complete timing difference measurement for asynchronous carriers.
Data Source
AI summary
A user apparatus for communicating with a first base station apparatus using a first RAT (Radio Access Technology) and a second base station apparatus using a second RAT includes a reception unit configured to receive, from the first base station apparatus, a configuration for measuring a timing difference between a cell of the first base station apparatus and a cell of the second base station apparatus; a control unit configured to perform measurement with respect to a cell of the second RAT based on the configuration for measuring the timing difference; and a transmission unit configured to transmit, to the first base station apparatus, a result of the performed measurement, wherein the configuration for measuring the timing difference includes information indicating an upper limit of a number of cells of the second RAT.