CSI Generation Using Pre-Measured Interference for CoMP
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current CSI reporting mechanisms in LTE-A systems face challenges in generating multiple CSIs within the defined period without compromising accuracy, especially when CoMP control requires flexible switching between base stations, and existing solutions either limit the number of CSIs or extend the reporting time, complicating scheduling and diminishing the effectiveness of CoMP.
Innovation Solution
The method involves using interference components measured in advance for CSI generation, allowing for flexible CoMP control by reducing the processing time and number of CSIs to be reported, while maintaining accuracy by utilizing previously measured interference values for a period, thus enabling efficient CSI reporting within the predefined timeframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple CSIs are generated within the defined period using current reporting mechanisms, then the quantity of CSI reports increases, but the processing time and complexity increase significantly
Solution Approach 1:
The patent applies preliminary action by having the terminal measure and store interference components in advance before receiving the CSI report request. When the base station triggers a CSI report, the terminal already has pre-measured interference data ready for use, eliminating the need to perform interference measurement at the moment of reporting. This pre-preparation of interference component data significantly reduces the processing complexity when multiple CSIs need to be generated within a defined period.
2Loss of time
If the number of CSIs to be reported is reduced, then the processing time decreases, but the quantity of information reported decreases
Solution Approach 1:
The patent enables the terminal to measure interference components in advance and maintain them in a ready state. When the base station needs CSI reports, the terminal can quickly generate multiple CSIs using the pre-measured interference data combined with newly measured desired signal components. This approach allows the terminal to report multiple CSIs (maintaining quantity of information) while significantly reducing the processing time required at the moment of reporting.
3Loss of time
If interference components are measured in advance for multiple CSIs, then the processing time is reduced, but the measurement precision of current channel conditions may decrease
Solution Approach 1:
The patent applies preliminary action by having the terminal measure interference components in advance and store them for subsequent CSI generation. The terminal measures the interference component once and reuses it across multiple CSI reports, which reduces processing time while maintaining acceptable precision for interference that changes relatively slowly compared to the desired signal.
Solution Approach 2:
The patent applies local quality by differentiating between how desired signal components and interference components are measured. The desired signal component is measured at the time of CSI reporting to capture current channel conditions, while the interference component is measured in advance as it changes more slowly. This differentiated approach optimizes both timeliness and precision for each component type.
4Adaptability or versatility
If CoMP control requires flexible switching between base stations, then the adaptability increases, but the scheduling complexity and coordination overhead increase
Solution Approach 1:
The patent enables flexible CoMP switching by having terminals pre-measure interference components from different base stations. When the base station needs to switch serving cells or perform coordinated scheduling, the terminal already has interference data from multiple base stations available, allowing rapid generation of multiple CSIs for different base stations without increasing coordination overhead or scheduling complexity.
Data Source
Figure 1A~1C
Figure 2
Figure 3~4
AI summary
The purpose of the present invention is to be able to simultaneously generate three or more sets of CSI within a predetermined time interval, without degrading the accuracy of the CSI, to achieve CoMP control for flexible switching of base stations. At predetermined intervals or at timing coincident with reception of trigger information, a generation unit (230) uses a CSI-RS resource to measure a desired signal component and interference component, and generate CSI. A transmission unit (240) transmits control information including the CSI. During a given interval (for example, during four sub-frames) following reception of trigger information, the generation unit (230) does not measure the interference component, instead using the most recent previously measured interference component, to measure the channel quality.