Segmented CSI Reporting for Accurate Multi-Resource Decoding
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Solution Overview
Problem
Existing 5G wireless communication systems face challenges in efficiently reporting channel state information (CSI) for multiple downlink resources, particularly in multi-TRP/panel and multi-band scenarios, limiting dynamic scheduling and adaptation of transmissions.
Innovation Solution
A method for enhanced CSI reporting involving a segmented CSI report structure with two parts, where part 1 has a fixed payload size known to the network node, and part 2's size is indicated by part 1, allowing the UE to report CSI quantities for a subset of selected resources, enabling dynamic scheduling across multiple frequency bands, TRPs, and panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single CSI report is used to report multiple downlink resources, then the reporting overhead is reduced, but the network node cannot accurately determine the payload size for decoding
Solution Approach 1:
The CSI report is divided into two distinct parts: part 1 with a fixed payload size that includes the size indication, and part 2 with variable payload size that contains the actual CSI quantities. This segmentation allows the network node to first decode part 1 to determine the size of part 2, enabling accurate decoding of the complete report while maintaining efficient overhead.
2Loss of information
If CSI quantities are reported for all N reference signal resources, then complete channel state information is provided, but the reporting overhead and processing complexity increase significantly
Solution Approach 1:
Instead of reporting CSI quantities for all N reference signal resources, the UE extracts and reports CSI quantities only for a subset of M selected resources (where M < N). The CSI report includes an indication of the selected resources and their corresponding CSI quantities, reducing reporting overhead and processing complexity while maintaining essential channel state information for scheduling decisions.
3Adaptability or versatility
If the CSI report payload size is variable to accommodate different numbers of selected resources, then flexibility is improved, but the network node cannot pre-allocate buffer size for decoding
Solution Approach 1:
The first part of the CSI report contains an indication of the payload size of the second part before the actual CSI quantities are transmitted. This preliminary action allows the network node to pre-allocate the appropriate buffer size and configure decoding parameters before receiving the variable-sized part 2, simplifying the decoding implementation while maintaining report flexibility.
Data Source
AI summary
The embodiment of the present disclosure relates to methods and apparatuses for enhancing the reporting of the channel state information (CSI) with respect to multiple downlink resources. A method performed by a UE comprises: receiving, from a network node, a CSI report configuration which provides a number N of reference signal resources for channel measurement; performing measurements on said N RS resources; calculating or determining one or more CSI quantities for a number M of selected RS resources; and transmitting, to the network node, a CSI report including the calculated or determined CSI quantities, wherein the CSI report comprises two parts—part 1 and part 2—, and wherein the content contained in part 1 indicates the size of part 2. There is also disclosed a UE, a method performed in a network node and a network node.