Communication Terminal Dual Connectivity Capability Determination
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Solution Overview
Problem
Communication terminals face challenges in determining whether they can perform dual connectivity (DC) using 5G (NR) due to information being provided by master and secondary base stations without considering the terminal's current position, leading to incorrect assessments of DC capabilities.
Innovation Solution
A communication terminal is designed to simultaneously communicate with a master base station using a first radio access technology and a secondary base station using a second radio access technology, receiving information on permitted dual connectivity and specifying supported frequency bands to determine DC capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the master base station notifies the UE of DC capability information without considering the UE's current position, then the information transmission is simplified, but the accuracy of DC capability determination deteriorates
Solution Approach 1:
The master base station performs preliminary actions by notifying the UE of DC capability information and secondary base station frequency band information in advance, before the UE actually attempts to establish DC. This allows the UE to proactively determine its DC capability based on pre-received information combined with current position assessment, rather than waiting for complex real-time negotiations.
Solution Approach 2:
The UE acts as an intermediary that receives information from the master base station, combines it with its own position information, and independently determines DC capability. This intermediary role allows the system to balance between simplified information transmission from the network and accurate capability determination at the terminal side.
2Device complexity
If the core network determines NR permission without considering the UE's current position, then the network control is simplified, but the reliability of NR usage permission deteriorates
Solution Approach 1:
The core network performs preliminary action by providing NR permission information to the UE in advance through the master base station. This preliminary permission grant simplifies network control architecture while allowing the UE to later validate this permission against its actual position and supported frequency bands, thereby maintaining reliability without increasing network complexity.
3Device complexity
If the UE relies solely on information from the master base station to determine DC capability, then the information processing is simplified, but the accuracy of capability assessment deteriorates
Solution Approach 1:
The master base station performs preliminary action by providing both DC capability information and secondary base station frequency band information to the UE in advance. This allows the UE to perform accurate capability assessment by combining this pre-received information with its own position and supported frequency band information, without requiring complex real-time information processing.
Solution Approach 2:
The UE performs feedback by determining its DC capability based on the received information and its own characteristics, and can report this determination back to the network. This feedback mechanism allows the UE to accurately assess its capability while keeping information processing relatively simple, as it only needs to compare received information with its own capabilities rather than performing complex calculations.
Data Source
AI summary
A communication terminal capable of determining whether or not it can perform DC, a base station, and a communication method are provided. A communication terminal (30) according to the present disclosure includes a communication unit (31) that simultaneously communicates with a master base station (10) associated with a first radio access technology and a secondary base station (20) associated with a second radio access technology, and a control unit (32) that specifies, when it is notified by the master base station (10) that it can provide dual connectivity using the second radio access technology, at least one frequency band supported by the secondary base station (20), the secondary base station being configured to provide the dual connectivity in cooperation with the master base station (10).