UE Capability Signaling for LTE-NR EN-DC Bandwidth Combinations
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Solution Overview
Problem
The existing methods do not specify how user equipment indicates bandwidth combinations for inter-band and intra-band multi-RAT dual connectivity in LTE-NR systems, specifically for EN-DC scenarios.
Innovation Solution
User equipment determines and transmits terminal capability information, including parameters for supported bandwidth combinations, to the base station device, enabling clear indication of bandwidth combinations for inter-band and intra-band EN-DC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the user equipment uses multiple RATs (E-UTRA and NR) for dual connectivity, then the adaptability and versatility of the communication system is improved, but the device complexity and difficulty of indicating bandwidth combinations increases
Solution Approach 1:
The patent segments the bandwidth combination indication into two separate parameters: a first parameter indicating supported bandwidth combinations for the first RAT's part, and a second parameter indicating bandwidth combinations supported for all bands. This segmentation simplifies the overall indication structure by dividing the complex multi-RAT bandwidth configuration into manageable parts that can be independently determined and transmitted.
Solution Approach 2:
The patent introduces a new dimension to the bandwidth combination indication by creating a hierarchical structure where the first parameter covers specific RAT parts and the second parameter covers all bands. This dimensional approach allows the system to handle multi-RAT complexity without increasing the overall indication burden, as each parameter operates at a different level of abstraction.
2Measurement precision
If the user equipment indicates detailed bandwidth combination information for inter-band and intra-band EN-DC, then the measurement precision and reliability of capability indication is improved, but the loss of information and signaling overhead increases
Solution Approach 1:
The patent merges the indication of bandwidth combinations for inter-band and intra-band EN-DC into a unified framework using two parameters. The first parameter handles the first RAT's part while the second parameter covers all bands, allowing the system to convey comprehensive capability information without requiring separate indication mechanisms for each scenario, thereby reducing overall signaling overhead.
Solution Approach 2:
The second parameter is designed to be universal, indicating bandwidth combinations supported for all bands of both inter-band and intra-band EN-DC. This universal parameter eliminates the need for separate specific indications for different band combinations, reducing information redundancy while maintaining precise capability representation.
Data Source
AI summary
A user equipment includes a receiving unit receiving band information of a RAT1 and a RAT2 from a base station, a control unit determining a parameter1 indicating a supported bandwidth combination (BWC) for the RAT1's part for inter-band EN-DC of the RAT1 and the RAT2 and a parameter2 indicating a BWC supported for all bands of the inter-band EN-DC and the intra-band EN-DC of the RAT1 and the RAT2 for dual connectivity of the RAT1 and the RAT2, the dual connectivity being composed of the inter-band EN-DC and the intra-band EN-DC of the RAT1 and the RAT2, for the band combination of the inter-band EN-DC, any combination of the RAT2's part of the BWC indicated by the parameter1 and the RAT1's part of the BWC indicated by the parameter1 is supported, and a transmitting unit transmitting terminal capability information including the determined parameter1 and parameter2 to the base station.