UE Capability Signaling for Multi-TRP Downlink Timing Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing multiple transmit/receive points (TRPs) for improved coverage, reliability, and data rates, particularly in multi-DCI based multi-TRP communication scenarios, where UE capabilities and preferences regarding downlink reference timing values and FFTs are not effectively signaled.
Innovation Solution
User equipment (UE) capability signaling is enhanced to notify a serving cell of its preferences and capabilities regarding the use of single or multiple downlink reference timing values and FFTs in multi-DCI based multi-TRP communication, enabling faster data rates and improved spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple downlink reference timing values are used in multi-DCI based multi-TRP communication, then coverage and reliability are improved, but device complexity increases due to the need for capability signaling and configuration
Solution Approach 1:
The patent applies preliminary action by having the UE transmit capability information messages before actual multi-TRP communication begins. The UE signals its support for single or multiple downlink reference timing values in advance, allowing the network to pre-configure appropriate parameters and avoid complexity during data transmission. This capability signaling mechanism enables reliable multi-TRP operation while managing device complexity through proactive information exchange.
2Productivity
If multiple downlink reference timing values with large differences are used, then spectral efficiency is improved, but processing complexity increases due to multiple FFT requirements
Solution Approach 1:
The patent applies dynamics by allowing flexible configuration of downlink reference timing values based on UE capability and network conditions. The system can dynamically select between single timing value mode (simpler processing) and multiple timing values mode (higher spectral efficiency) depending on the specific deployment scenario. This dynamic adaptation enables the system to optimize between spectral efficiency and processing complexity rather than being fixed to one approach.
3Device complexity
If single downlink reference timing value is used, then device complexity is reduced, but coverage and reliability are compromised in multi-TRP scenarios
Solution Approach 1:
The patent applies parameter changes by enabling the system to switch between different timing value configurations (single vs. multiple) based on network conditions and UE capability. The capability signaling mechanism allows the network to change the operational parameter from single timing value to multiple timing values when needed for improved reliability, while maintaining simplicity when single timing value suffices. This parameter flexibility resolves the contradiction between complexity reduction and reliability maintenance.
Data Source
AI summary
Techniques related to multiple downlink control information (multi-DCI) based multiple transmit/receive point (multi-TRP) communication are disclosed. Some aspects of the disclosure relate to devices and methods for user equipment (UE) capability information signaling. In some examples, a UE receives a control message configuring the UE for multi-DCI based multi-TRP communication. The UE transmits a UE capability information message relating to UE support for utilizing at least one of a single downlink reference timing value or plural downlink reference timing values. The UE then communicates with a serving cell with the single downlink reference timing value or with the multiple downlink reference timing values. Other aspects, embodiments, and features are also claimed and described.