Early CSI Feedback in NR Random Access
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Solution Overview
Problem
In New Radio (NR) telecommunications systems, there is a challenge in reducing the delay in acquiring Channel State Information (CSI) to enable efficient data transmission with high spectral efficiency early in the communication process.
Innovation Solution
The proposed solution involves providing early CSI reporting by receiving information related to a CSI Reference Signal (CSI-RS) or a CSI Interference Measurement (CSI-IM) resource from the network, measuring the channel or interference using these resources, computing CSI, and sending a CSI report during the random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If CSI feedback is provided only after connection setup and CSI framework configuration, then the system maintains standard procedural complexity, but the data transmission delay increases and spectral efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by enabling the UE to perform CSI measurements and generate CSI reports before the formal connection setup is complete. Specifically, the UE measures channel state information on downlink resources (such as PDSCH or CSI-RS) received during the random access procedure and prepares CSI feedback in advance, which is then transmitted earlier than in conventional procedures. This reduces the time delay in CSI acquisition without significantly increasing system complexity.
2Productivity
If early CSI reporting is implemented, then spectral efficiency improves through earlier link adaptation, but the system requires additional signaling and measurement resources
Solution Approach 1:
The patent applies universality by designing the early CSI reporting mechanism to reuse existing downlink resources for multiple purposes. The same PDSCH or CSI-RS resources used for data transmission or channel sounding are also utilized for CSI measurement purposes. Additionally, the uplink resources for transmitting early CSI reports are selected from available uplink channels (PUSCH, PUCCH, or random access channels) that already exist in the system, thereby avoiding the need for entirely new dedicated signaling resources while still enabling improved data transmission efficiency.
Data Source
AI summary
Systems and methods for early Channel State Information (CSI) feedback in New Radio (NR) are provided. In embodiments of the disclosure, CSI reporting is performed during a random access procedure to provide early CSI feedback and enable more efficient data transmission with higher spectral efficiency in earlier communications. In some examples, CSI reporting can be reported on Message 3 of the random access procedure after measuring channel and/or interference on a CSI Reference Signal (RS) (CSI-RS) during the random access procedure. The proposed solution allows early CSI to be triggered when a User Equipment (UE) performs initial access to a serving cell. With the early CSI acquired, the network can perform proper link adaptation including Multiple Input Multiple Output (MIMO) precoding, and ensure efficient data transmission without having to wait until connection setup and configuration of the CSI framework is established.