CSI Update Capability Limiting for Wireless Latency Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing packet data latency, particularly in next-generation mobile communication systems like new radio access technology (NRAT) and long-term evolution (LTE), where efficient channel state reporting is crucial for faster internet access.
Innovation Solution
A method and apparatus for a user equipment (UE) to efficiently report channel state information (CSI) by receiving CSI requests from a base station, updating CSI based on maximum CSI update capability for a transmission time interval (TTI) length, and reporting CSI accordingly, including configuration for each TTI length, prioritization of CSI processes, and support for different transmission modes and error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE updates CSI for multiple CSI processes simultaneously, then the channel state reporting accuracy is improved, but the processing time and latency increase
Solution Approach 1:
The patent segments the CSI update process by introducing a maximum CSI update capability parameter that limits the number of CSI processes updated simultaneously. This segmentation allows the system to balance between updating multiple CSI processes for accuracy and limiting simultaneous updates to reduce processing time, resolving the contradiction between measurement precision and time loss.
2Productivity
If the UE supports a larger number of CSI processes, then the system capacity and multiplexing efficiency are improved, but the device complexity and processing burden increase
Solution Approach 1:
The patent introduces dynamic control mechanisms where the base station configures the maximum CSI update capability based on UE capability information. This dynamic adjustment allows the system to support a larger number of CSI processes when needed while reducing the processing burden by limiting simultaneous updates when the UE capability is constrained, thus resolving the contradiction between system capacity and device complexity.
3Speed
If the TTI length is reduced, then the latency is decreased and faster internet access is achieved, but the CSI update capability and processing accuracy are compromised
Solution Approach 1:
The patent changes the parameter of maximum CSI update capability based on the TTI length configuration. When shorter TTI lengths are used for faster access, the system adjusts the maximum CSI update capability parameter to reflect the reduced processing time available, ensuring that CSI update requirements are appropriately matched to the shortened transmission time interval, thus resolving the contradiction between speed and measurement precision.
Data Source
AI summary
A method for reporting a channel state in a wireless communication system according to an embodiment of the present disclosure, which is performed by a terminal, may comprise the steps of: receiving, from a base station, a channel state information (CSI) request; and reporting, to the base station, CSI corresponding to the CSI request, on the basis of the maximum CSI update capability for a transmission time interval (TTI) length associated with the CSI request, wherein information on the maximum CSI update capability includes the maximum number of CSI processes for the TTI length, which can be simultaneously updated by the terminal.