Multi-Cell DCI Detection Under Blind Detection Size Limits
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Solution Overview
Problem
The introduction of multi-cell DCI (MC-DCI) with varying sizes and formats increases the total number of DCI sizes, exceeding the fixed maximum number of blind detections in a time domain unit, affecting the flexibility and performance of physical downlink control channel transmission.
Innovation Solution
Implement methods to ensure that the number of DCI sizes scrambled by different RNTIs within a time domain unit does not exceed predefined limits, either by configuring DCI transmission in separate time domains or by determining and omitting certain DCIs based on priority or search space, maintaining the '3+1' requirement for blind detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MC-DCI with varying sizes and formats is introduced to schedule multiple cells, then the scheduling capability for multiple cells is improved, but the total number of DCI sizes exceeds the fixed maximum number of blind detections
Solution Approach 1:
The patent applies universality by enabling a single DCI format to schedule multiple cells simultaneously. The MC-DCI structure includes a cell indicator field that identifies multiple cells, allowing one DCI message to perform the scheduling function for multiple cells instead of requiring separate DCI messages for each cell. This reduces the total number of DCI sizes while maintaining multi-cell scheduling capability.
Solution Approach 2:
The patent changes the parameters of the DCI structure by introducing a cell indicator field and configuring multiple cell relationships within a single DCI message. By modifying the DCI format to include parameters that identify and relate multiple cells, the system can schedule multiple cells with a unified DCI size, thereby reducing the total number of distinct DCI sizes while preserving scheduling versatility.
2Reliability
If the number of DCI sizes is reduced to meet blind detection limits, then the number of blind detections is maintained, but the flexibility of DCI format variation is reduced
Solution Approach 1:
The patent resolves this contradiction by creating a universal DCI format that can adapt to different cell combinations through the cell indicator field. Instead of creating multiple specialized DCI formats for different cell scenarios, a single MC-DCI format handles all multi-cell scheduling cases, maintaining a limited number of DCI sizes for reliable blind detection while preserving flexibility through parameter configuration.
Solution Approach 2:
The patent applies dynamics by making the DCI content flexible within a fixed size structure. The cell indicator field and associated parameters allow the DCI message to dynamically adapt to different multi-cell scheduling scenarios while maintaining a consistent overall format size. This enables format variation flexibility without increasing the number of distinct DCI sizes, ensuring reliable blind detection limits are met.
Data Source
AI summary
The present disclosure relates to a downlink control information (DCI) detection method and device, and a DCI sending method and device. The DCI detection method comprises: not expecting that, in a same time domain unit, the number of sizes of DCI that is scrambled by means of a first radio network temporary identifier (RNTI) and needs to be detected is greater than a first number, and the number of sizes of DCI that is scrambled by means of a second RNTI and needs to be detected is greater than a second number, wherein the DCI at least comprises DCI for scheduling a plurality of cells (S101).