Terminal Capability Indication for Non-Coherent Joint Transmission
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Solution Overview
Problem
The implementation of non-coherent joint transmission (NCJT) in 5G-oriented wireless communications is hindered by the inability of new user equipment to identify and support advanced DCI formats, leading to inefficiencies in spectrum utilization and user experience.
Innovation Solution
A method where terminals report capability indication information to base stations, allowing for accurate determination of supported transmission modes and formats, thereby enabling appropriate DCI configuration and improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If new user equipment is deployed without NCJT capability indication, then device complexity is reduced and compatibility is improved, but spectrum efficiency deteriorates and system productivity decreases
Solution Approach 1:
The terminal performs preliminary capability indication through RRC signaling before actual data transmission. This allows the base station to pre-configure appropriate DCI formats and transmission parameters, ensuring that NCJT can be efficiently utilized when the terminal is capable, while maintaining backward compatibility for terminals that do not support NCJT.
2Productivity
If advanced DCI formats are used for NCJT, then transmission efficiency is improved, but the ability to support new user equipment deteriorates due to identification failures
Solution Approach 1:
The system dynamically adapts DCI formats based on terminal capability indications. When a terminal indicates NCJT support capability, the base station configures advanced DCI formats (such as DCI format 2E) for efficient NCJT transmission. When NCJT capability is not indicated, the base station uses conventional DCI formats, ensuring broad compatibility across different terminal types while optimizing transmission efficiency for capable terminals.
3Measurement precision
If capability indication signaling is added, then transmission accuracy is improved, but signaling overhead increases
Solution Approach 1:
The capability indication information is merged into existing RRC signaling procedures rather than being transmitted as separate dedicated signaling. Specifically, the NCJT capability indication is incorporated into UE capability reporting mechanisms that are already part of the RRC protocol, thereby achieving accurate capability indication while minimizing additional signaling overhead.
Data Source
AI summary
Embodiments of this application disclose an information transmission method and an apparatus. The method includes: sending, by a terminal to a base station, capability indication information used to indicate whether the terminal supports non-coherent joint transmission; and receiving downlink control information sent by the base station, where the downlink control information is based on the capability indication information. According to the embodiments of this application, the base station can know whether the terminal supports NCJT, so as to select an appropriate transmission mode.