CSI-RS Resource Updates for Low-Latency Beam Adjustment
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Solution Overview
Problem
The high latency of RRC messages in updating CSI-RS resources leads to delayed beam selection by terminal devices, resulting in transmission performance loss due to the inability to timely adjust reception beams.
Innovation Solution
Utilizing DCI or MAC-CE for updating reference signal resources, reducing latency and enabling timely beam adjustments by indicating updated information through lower-latency mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC message is used to update CSI-RS resource information, then the update is reliable and complete, but the latency is high and the beam selection is delayed
Solution Approach 1:
The patent segments the beam management update process into two parts: initial configuration via RRC message and subsequent updates via MAC-CE or DCI. This segmentation allows reliable initial setup while enabling low-latency updates for beam adjustments, resolving the contradiction between reliability and latency.
Solution Approach 2:
The patent introduces dynamic update mechanisms (MAC-CE and DCI) that can rapidly adjust beam information without requiring full RRC reconfiguration. This dynamic approach enables timely beam selection while maintaining the reliability of the original RRC-configured parameters, thus resolving the latency issue without sacrificing reliability.
2Adaptability or versatility
If RRC message is used for resource configuration, then the configuration is comprehensive, but the response time is slow leading to transmission performance loss
Solution Approach 1:
The patent divides the configuration system into a comprehensive RRC layer for initial setup and a fast MAC-CE/DCI layer for updates. This segmentation preserves the completeness of RRC configuration while enabling fast beam selection through lower-layer signaling, thus resolving the contradiction between configuration completeness and beam selection speed.
Solution Approach 2:
The patent introduces MAC-CE and DCI as intermediary mechanisms that translate and rapidly convey beam update information without requiring full RRC message exchange. These intermediaries maintain the comprehensiveness of RRC configuration while dramatically improving the speed of beam selection and adaptation.
Data Source
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AI summary
A resource update method and a related apparatus are provided. The method includes: receiving an RRC message from a network device, where the RRC message is used for configuring at least one reference signal resource group, and each of the at least one reference signal resource group includes at least one reference signal resource; and receiving a resource update message from the network device, where the resource update message is used for updating information about a reference signal resource in N reference signal resource groups in the at least one reference signal resource group, N is a positive integer, and the resource update message is DCI or a MAC-CE. In comparison with an RRC message, updating information about a reference signal resource by using DCI or a MAC-CE causes lower latency, so that the network device can indicate updated information about the reference signal resource to a terminal device in a timely manner, to facilitate the terminal device in adjusting a reception beam in a timely manner, improving transmission performance.