UE Capability Signaling via Common Fields in 5G Systems
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Solution Overview
Problem
Existing mobile communication systems face challenges in efficiently providing information about user equipment (UE) capabilities and performing cell reselection in a mobile communication system, especially in 5G networks with diverse duplex modes and frequency ranges.
Innovation Solution
A method and apparatus for a user equipment (UE) and a base station (BS) to exchange UE capability information, including determining specific UE capability fields applicable for all duplex modes and frequency ranges, and using scheduling request resources for data transmission in a mobile communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE capability information is provided for each specific duplex mode and frequency range separately, then the accuracy of capability information is improved, but the signaling overhead and complexity increase
Solution Approach 1:
The UE capability information is segmented into common fields (applicable to all duplex modes and frequency ranges) and specific fields (applicable to specific duplex modes or frequency ranges). This segmentation allows the common parts to be signaled once while specific parts are signaled only when needed, reducing overall signaling overhead while maintaining accuracy.
Solution Approach 2:
Different parts of the UE capability information are provided with different levels of detail based on local requirements. Common capability fields are provided in a simplified form applicable to all scenarios, while specific capability fields are provided with detailed information only for the relevant duplex modes or frequency ranges, optimizing the balance between accuracy and overhead.
2Adaptability or versatility
If comprehensive UE capability information is transmitted for all duplex modes and frequency ranges, then the adaptability of the system is improved, but the transmission time and resource usage increase
Solution Approach 1:
The common UE capability fields are designed to be universal and applicable to all duplex modes (FDD, TDD, dynamic TDD) and frequency ranges. This allows the system to achieve high adaptability without needing to transmit separate capability information for each scenario, as the common fields can be reused across multiple contexts.
Solution Approach 2:
Instead of transmitting complete capability information for all possible duplex modes and frequency ranges, the system transmits only the necessary common fields plus specific fields for the currently relevant scenarios. This partial action approach achieves sufficient adaptability for the current operation while avoiding the time cost of transmitting unnecessary capability information.
3Measurement precision
If separate capability fields are maintained for FDD, TDD, FR1, and FR2, then the precision of capability information is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent merges the separate capability fields for FDD, TDD, FR1, and FR2 into a unified structure with common fields that apply to all modes. This merging reduces processing overhead by eliminating redundant handling of identical capability information across different duplex modes and frequency ranges, while still maintaining the ability to provide mode-specific precision when needed through optional specific fields.
Data Source
AI summary
A user equipment (UE) for performing communication, the UE including a transceiver; and a processor coupled with the transceiver and configured to: control the transceiver to receive a UE capability enquiry, determine UE capability fields, except a frequency division duplexing (FDD) additional UE capability field, a time division duplexing (TDD) additional UE capability field, a frequency range 1 (FR 1) additional UE capability field and a frequency range 2 (FR 2) additional UE capability field, to include values applicable for all duplex modes and frequency ranges, and control the transceiver to transmit UE capability information based on a result of the determination.