CSI Calculation for Non-Coherent Joint Transmission
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Solution Overview
Problem
The existing New Radio (NR) CSI protocol framework only supports closed-loop and open-loop/semi-open-loop transmission solutions, failing to incorporate non-coherent joint transmission solutions.
Innovation Solution
A CSI calculation method that determines the CSI calculation behavior based on network configuration information, allowing for non-coherent joint transmission by using measurement results of other codewords as inter-codeword interference for CSI calculation, and reporting CSI with prioritized subbands to ensure effective communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing NR CSI protocol framework is used, then closed-loop and open-loop/semi-open-loop transmission solutions are supported, but non-coherent joint transmission solutions are not supported
Solution Approach 1:
The patent segments the CSI calculation process into separate procedures for different transmission solutions. It introduces specific determination steps that identify whether closed-loop, open-loop, or non-coherent joint transmission is being used, and applies corresponding calculation methods for each segment. This allows the protocol to support multiple transmission modes without creating a monolithic complex framework.
Solution Approach 2:
The patent makes the CSI calculation method dynamic by introducing determination steps that adapt the calculation approach based on the identified transmission solution type. The system dynamically selects between different CSI calculation procedures (first procedure for closed-loop, second procedure for open-loop/semi-open-loop, third procedure for non-coherent joint transmission) based on real-time transmission mode identification, enabling versatility without permanent structural complexity.
2Reliability
If CSI calculation is performed for non-coherent joint transmission, then all codeword CSI can be calculated, but calculation complexity increases due to inter-codeword interference
Solution Approach 1:
The patent applies preliminary action by measuring and calculating interference from other codewords before performing the main CSI calculation for each codeword. The determination step identifies the transmission solution type in advance, and the measurement of inter-codeword interference is performed beforehand, allowing the main CSI calculation to proceed with this pre-computed interference information already available, thus reducing overall calculation complexity.
Solution Approach 2:
The patent introduces inter-codeword interference measurement as an intermediary element in the CSI calculation process. By measuring the interference from other codewords separately and using it as a mediator in the CSI calculation for each codeword, the system simplifies the overall computation. Instead of directly calculating complex multi-codeword interactions, the interference is measured as an intermediate step that facilitates the final CSI determination.
Data Source
AI summary
A CSI calculation method, a user terminal and a computer-readable storage medium, the method comprising: receiving network configuration information issued by a network side; determining a CSI calculation behavior according to the network configuration information; and when the CSI calculation behavior is carrying out CSI calculation on the basis of non-coherent joint transmission, calculating CSI corresponding to each codeword, wherein when CSI corresponding to a first codeword is calculated, measurement and calculation results of resources corresponding to the other codewords are taken as inter-codeword interference corresponding to the first codeword. The above-mentioned solution can realize CSI calculation of a non-coherent joint transmission scheme.