User Apparatus Maximum Receive Timing Difference Setting for EN-DC
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Solution Overview
Problem
In radio communication systems using multiple radio access technologies, the existing technologies face challenges in correctly setting the received timing difference for dual connectivity due to RF circuit restrictions, particularly for EN-DC band combinations where only one receiver is implemented, leading to inconsistencies in maximum receive timing differences (MRTD) across different band combinations.
Innovation Solution
A user apparatus is designed with a reception unit to receive information requesting a capability report, a transmission unit to transmit the capability report, and a control unit that receives signals from base stations within a maximum receive timing difference associated with the band combination, allowing for accurate setting of the received timing difference for dual connectivity across different radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inter-band MRTD value is referenced for EN-DC band combinations with close frequency bands, then the system can handle different band combinations, but the receiver cannot simultaneously receive signals due to RF circuit restrictions
Solution Approach 1:
The patent changes the MRTD parameter value based on the specific band combination type. For EN-DC band combinations with close frequency bands, it applies intra-band MRTD (3μs) instead of inter-band MRTD (33μs), optimizing the timing difference parameter to match the physical constraints of the single receiver architecture.
2Device complexity
If a single receiver is implemented for RF circuit restrictions, then device complexity is reduced, but the ability to simultaneously receive signals from multiple base stations is compromised
Solution Approach 1:
The patent adjusts the MRTD parameter to compensate for the single receiver limitation. By setting appropriate timing difference values based on band combination characteristics, the system enables correct simultaneous reception handling with a single receiver, maintaining operational ease without requiring multiple receivers.
3Ease of manufacture
If incorrect MRTD values are used for EN-DC band combinations, then configuration is simplified, but timing synchronization accuracy deteriorates
Solution Approach 1:
The patent implements dynamic parameter selection where the MRTD value changes based on the detected band combination type. The system automatically selects intra-band or inter-band MRTD values according to the specific EN-DC configuration, ensuring timing synchronization accuracy without manual intervention or complex configuration.
4Measurement precision
If different MRTD values are applied for intra-band and inter-band combinations, then timing precision is improved, but system complexity increases
Solution Approach 1:
The patent implements self-service through automatic band combination detection and corresponding MRTD value selection. The user apparatus autonomously determines whether to apply intra-band or inter-band MRTD based on the detected frequency bands, eliminating the need for manual configuration or complex external management while maintaining timing precision.
Data Source
AI summary
A user apparatus includes a reception unit that receives, from a base station, information requesting a capability report of the user apparatus; a transmission unit that transmits, to the base station, the capability report of the user apparatus; and a control unit that receives a first signal transmitted from the base station, and a second signal transmitted from another base station or a third signal transmitted from the base station, within a maximum receive timing difference associated with a band combination included in the capability report of the user apparatus, wherein the band combination includes a combination of a band of the first signal and a band of the second signal or the third signal, a radio access technology for the first signal differs from that of the second signal, and the radio access technologies for the first signal and for the third signal are the same.