CSI Process Configuration for User Terminal Load Management
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Solution Overview
Problem
In the LTE-A system, configuring multiple CSI processes increases processing load on user terminals, leading to potential deterioration of throughput performance when CSI is calculated using radio resources farther apart in time to alleviate this load.
Innovation Solution
The radio communication system configures CSI processes using the nearest CSI reference resource in a subframe that is four or more subframes before the identified subframe number, allowing user terminals to determine and perform CSI feedback based on this configuration, thereby reducing processing load and maintaining throughput performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple CSI processes are configured to support CoMP transmission, then the system can achieve better throughput performance through inter-cell orthogonalization, but the processing load on user terminals increases
Solution Approach 1:
The patent segments the CSI calculation process by introducing multiple CSI processes (first CSI process and second CSI process) that can be independently configured and calculated. This allows the terminal to divide the complex CSI feedback task into separate, manageable processes, each handling specific reference signals and interference measurement resources, thereby reducing the overall processing load while maintaining comprehensive channel state information collection
Solution Approach 2:
The patent enables partial CSI calculation by allowing the terminal to calculate CSI for only one of the configured CSI processes at a time, or to prioritize certain CSI processes over others. This partial action approach reduces the immediate processing burden on the terminal while still providing sufficient channel state information for effective CoMP transmission, with the option to add more CSI processes as needed
2Device complexity
If CSI is calculated using radio resources farther apart in time to reduce processing load, then the processing load on user terminals decreases, but throughput performance deteriorates
Solution Approach 1:
The patent applies preliminary action by configuring multiple CSI processes in advance, each associated with specific CSI reference resources that are predetermined. This allows the terminal to prepare and calculate CSI for multiple processes ahead of time using resources that are appropriately spaced, reducing the need for intensive real-time calculations while maintaining accurate and timely CSI feedback for throughput optimization
Data Source
AI summary
The present invention is designed to provide a radio communication system, a base station apparatus, a user terminal and a radio communication method, whereby, when a plurality of kinds of CSI processes are configured, it is possible to lighten the processing load, and, furthermore, reduce the deterioration of throughput performance. The radio communication method of the present invention includes a plurality of base station apparatuses that transmit CSI-RSs for measuring CSI and a user terminal that communicates with the plurality of base station apparatuses, and, when a plurality of CSI processes, which are combinations of SMRs and IMRs, are configured, in each of the base station apparatuses, a CSI process for requesting CSI with a nearest CSI reference resource in a subframe of the subframe number N-4 or an earlier subframe is configured, and in the user terminal, the CSI process configured in each of the base station apparatuses is determined, and, the CSI feedback process is performed based on the determination.