Sidelink CSI Report Priority Handling in NR
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Solution Overview
Problem
In new radio (NR) sidelink communications, there is no established method for determining priority information for channel state information (CSI) reports, which is crucial for determining transmission parameters like power, modulation, and resource allocation.
Innovation Solution
A method is introduced where a first user equipment (UE) receives a radio resource control (RRC) message to configure a priority level for a logical channel, generates a Medium Access Control (MAC) control element for a CSI report with a fixed second priority level, and determines prioritization between the MAC control element and data based on this priority, allowing for appropriate transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a CSI report is transmitted via Physical Sidelink Shared Channel (PSSCH) without associated priority information, then the CSI report can be generated and transmitted at the physical layer, but priority determination for transmission parameters (TX power, modulation and coding scheme, resource allocation) cannot be performed
Solution Approach 1:
The patent introduces a priority field as an intermediary element within the MAC CE structure. This priority field acts as a mediator that carries priority information from the MAC layer to the physical layer, enabling the PSSCH to associate priority information with the CSI report payload without fundamentally changing the physical layer generation process. The priority field is embedded in the MAC CE that contains the CSI report, allowing seamless integration of priority information into the existing transmission framework.
2Ease of operation
If priority information is added to the MAC Control Element (MAC CE) containing the CSI report, then priority determination for transmission parameters becomes possible, but the MAC CE structure becomes more complex
Solution Approach 1:
The patent merges the priority information with the existing MAC CE structure by embedding the priority field within the MAC CE that already contains the CSI report. Instead of creating a separate priority indication mechanism or modifying multiple independent structures, the solution combines the priority information and CSI report into a single integrated MAC CE, reducing overall system complexity while enabling priority determination.
3Speed
If the CSI report payload is generated at the physical layer (layer L1), then generation speed is fast, but no priority information can be associated with the PSSCH containing the CSI report
Solution Approach 1:
The patent resolves this contradiction by operating in another dimension - the MAC layer dimension. Instead of trying to add priority information at the physical layer where the CSI report is generated, the solution introduces priority information at the MAC layer dimension, which then associates with the physical layer transmission through the MAC CE structure. This dimensional separation allows fast physical layer generation to be maintained while simultaneously providing priority information through the MAC layer.
Data Source
AI summary
A method of channel state information (CSI) reporting by a first user equipment (UE) is disclosed. The method comprises receiving, from a base station (BS), a radio resource control (RRC) message to configure a first priority level for a logical channel; performing a sidelink (SL) communication with a second UE; generating a Medium Access Control (MAC) control element (CE) for a CSI report for the SL communication with a second priority level in a fixed value; determining a prioritization between the MAC CE including the CSI report and data from the logical channel according to the fixed value of the second priority level and the first priority level; and transmitting, to the second UE or the BS, at least one of the MAC CE and the data from the logical channel based on the determined prioritization.