CSI Feedback Concatenation for CoMP Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE-A systems, the limited processing ability of user equipment (UE) restricts the number of channel state information (CSI) pieces that can be effectively reported for CoMP transmission, particularly for multiple transmission points and interference assumptions, lacking an effective method for CSI feedback.
Innovation Solution
The method involves concatenating multiple CSI pieces in the bit domain for feedback, allowing for the transmission of multiple CSI pieces without being limited by the UE's processing ability, and employing different encoding and mapping techniques for RI and CQI/PMI information to ensure reliable transmission, while reusing existing LTE system feedback methods for RI and CQI/PMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple pieces of CSI are reported for CoMP transmission, then transmission performance is improved, but UE processing complexity increases beyond its limited processing ability
Solution Approach 1:
The patent segments the feedback of multiple CSI pieces into separate reporting structures, where each CSI piece corresponds to a specific transmission point and interference assumption. This segmentation allows the UE to process and report CSI for multiple transmission points without overwhelming its processing capabilities, as each segmented CSI report can be handled independently according to the UE's limited processing ability.
Solution Approach 2:
The patent introduces a new dimension for organizing CSI feedback by creating a structured reporting framework that incorporates transmission point identification and interference assumption indicators. This dimensional organization transforms the complex multi-dimensional CSI feedback problem into a more manageable structure that the UE can process within its capabilities while still achieving improved transmission performance.
2Productivity
If multiple pieces of CSI are reported for different transmission points, then CoMP transmission effectiveness is improved, but feedback overhead increases
Solution Approach 1:
The patent merges multiple CSI reports into a unified feedback structure that is transmitted through the PUSCH. By combining the CSI feedback for multiple transmission points into a single coordinated reporting mechanism, the patent reduces the overall feedback overhead compared to separate reporting channels, while still maintaining the ability to convey information about multiple transmission points and interference assumptions.
Solution Approach 2:
The patent creates a universal feedback framework that can handle multiple CSI pieces for different transmission points and interference assumptions through a single standardized reporting structure. This multi-functional approach allows the same feedback mechanism to serve multiple purposes (reporting CSI for different TPs, different interference assumptions) without requiring separate dedicated channels for each, thereby reducing overall feedback overhead.
3Reliability
If accurate CSI feedback is provided for link adaptive transmission, then transmission reliability is improved, but UE processing requirements exceed its limited processing ability
Solution Approach 1:
The patent applies preliminary action by having the network configure the UE with specific reporting configurations and parameters in advance. This preliminary configuration includes setting up the structure for reporting multiple CSI pieces, defining the transmission points to monitor, and specifying the interference assumptions to evaluate. By preparing these parameters beforehand, the UE can perform accurate CSI feedback calculations within its processing limits without needing to handle all the complexity in real-time.
Solution Approach 2:
The patent introduces an intermediary role where the network side assists the UE in the CSI feedback process by providing configuration information, reference signals, and processing aids. This intermediary support enables the UE to generate accurate CSI feedback for multiple transmission points without exceeding its processing capabilities, as the network provides the necessary intermediate data and processing framework.
Data Source
Figure 1~2
Figure 4
Figure 5~6
AI summary
A method for feeding back channel state information, UE and system. The method is applicable to a CoMP transmission system and includes: feeding back channel state indication information to a network side by way of concatenating more than one pieces of channel state indication information in a bit domain. In this way, a method for feeding back multiple pieces of CSI in the CoMP transmission may be provided. Furthermore, RI information and CQI/PMI information in the CSI information may be respectively encoded and mapped, so as to ensure reliable transmission of the RI information and CQI/PMI information.