Future-Time CSI Reporting for Motion-Aware Precoder Scheduling
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Solution Overview
Problem
In multi-antenna transmission systems, the recommended pre-coder matrix may become time-sensitive due to the high/medium velocity movement of terminal devices, making it inappropriate for subsequent data transmission scheduling by the network device.
Innovation Solution
The terminal device determines a set of Channel Quality Indicators (CQIs) conditioned on a Precoding Matrix Indicator (PMI) corresponding to a future time unit, and transmits a CSI report including these CQIs and PMIs to the network device, ensuring the network device is aware of channel characteristics for future data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the terminal device reports CSI based on current channel measurements, then the reporting process is simple and timely, but the reported pre-coder matrix becomes time-sensitive and inapplicable for subsequent data transmission scheduling
Solution Approach 1:
The terminal device performs preliminary channel measurements and determines CQIs for multiple future time units in advance. Instead of reporting current channel state only, the device proactively calculates and reports CQIs for future time units (n+1, n+2, etc.), allowing the network device to select appropriate CQIs for upcoming data transmissions, thus ensuring reliability without sacrificing timeliness.
Solution Approach 2:
The patent introduces dynamic time unit indexing where the terminal device reports CQIs associated with multiple time units rather than a single current time unit. The network device can dynamically select which CQI to use based on the actual scheduling time, making the system adaptable to channel variations caused by terminal movement while maintaining efficient reporting.
2Reliability
If the terminal device determines CQIs for future time units, then the network device can schedule data transmission based on up-to-date channel conditions, but the terminal device's processing complexity increases
Solution Approach 1:
The terminal device performs all necessary channel measurements and CQI calculations in advance for multiple future time units. By completing the preliminary action of determining CQIs beforehand, the device avoids complex real-time processing during actual data transmission scheduling, thus reducing operational complexity while maintaining accuracy.
Solution Approach 2:
The terminal device creates multiple copies of CQI information for different time units based on the current channel measurement. Instead of performing complex predictions during scheduling, the device pre-generates CQI copies for future time units, simplifying the processing burden during actual data transmission while ensuring accurate channel condition representation.
3Productivity
If the network device uses the recommended pre-coder matrix immediately, then data transmission can start quickly, but the pre-coder matrix may not be appropriate due to terminal device movement
Solution Approach 1:
The network device receives CQIs that have been preliminarily determined for multiple future time units. This allows the network device to immediately schedule data transmission using the appropriate pre-coder matrix without waiting for additional measurements or calculations, thus maintaining high productivity while ensuring reliability through advance CQI determination.
Solution Approach 2:
The system dynamically matches the reported CQIs with the actual data transmission timing. The network device can select from multiple CQIs corresponding to different future time units, dynamically choosing the most appropriate one based on when data transmission actually occurs, thus adapting to terminal movement while maintaining fast transmission start.
Data Source
AI summary
Example embodiments of the present disclosure relate to methods, devices, and computer storage medium for communication. A terminal device determines a first set of Channel Quality Indicators (CQI) conditioned on a first Precoding Matrix Indicator (PMI), the first PMI corresponding to a first time unit. A second timing of the first time unit is not earlier than a first timing of a first time duration for reporting Channel State Information (CSI). Then, the terminal device transmits a CSI report comprising the first set of CQIs and the first PMI to a network device in the first time duration.