Multi-Cell DCI Search Space Configuration for Lower Blind Decoding Load
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Solution Overview
Problem
Existing wireless communication systems lack explicit configuration of specific combinations of DCI formats for single-cell and multi-cell scheduling, leading to inefficient blind decoding and increased power consumption, processor utilization, and latency in UE processing.
Innovation Solution
A network entity and UE are configured to support specific combinations of DCI formats, allowing for simplified blind decoding by explicitly defining search spaces for single-cell and multi-cell scheduling, reducing power consumption and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE blindly decodes all possible DCI format candidates without explicit configuration, then the UE may detect scheduling DCI for multiple cells, but the blind decoding complexity and processing time increase significantly
Solution Approach 1:
The patent segments the blind decoding process by dividing DCI formats into two distinct groups: single-cell scheduling DCI formats and multi-cell scheduling DCI formats. Each group is assigned to separate search space sets, allowing the UE to process them independently rather than blindly decoding all possible combinations, thus reducing decoding complexity while maintaining support for multiple DCI format types
Solution Approach 2:
The network performs preliminary configuration by explicitly indicating which DCI formats are present in each search space set before the UE begins blind decoding. This advance information allows the UE to prepare appropriate decoding parameters and skip invalid format combinations, reducing processing time and complexity
2Reliability
If a UE processes both single-cell scheduling DCI and multi-cell scheduling DCI simultaneously in the same search space, then comprehensive scheduling coverage is achieved, but processor utilization increases and latency increases
Solution Approach 1:
The patent separates single-cell and multi-cell scheduling DCI into different search space sets, allowing the UE to process them in distinct time slots or processing cycles. This segmentation enables the UE to focus computational resources on one DCI type at a time, reducing processing latency while still achieving comprehensive scheduling coverage across both search spaces
Solution Approach 2:
The UE alternates between processing single-cell DCI and multi-cell DCI in a periodic manner across different monitoring occasions. This periodic processing pattern allows the UE to manage computational load efficiently, switching between DCI format types in a structured way that reduces peak processor utilization while maintaining reliable detection of both DCI types
3Reliability
If a UE monitors all PDCCH candidates for all DCI formats, then no scheduling information is missed, but power consumption increases
Solution Approach 1:
The network provides preliminary indication of which DCI formats are present in each search space set before the UE begins monitoring. This advance information allows the UE to activate only the necessary decoding circuits for the indicated formats, avoiding power-consuming blind decoding attempts for formats that are not present, thus reducing power consumption while maintaining reliable detection
Solution Approach 2:
The UE dynamically adjusts its monitoring and decoding behavior based on the indicated DCI format combinations. When certain DCI formats are indicated as absent, the UE reduces monitoring activity for those formats, dynamically scaling back power consumption while maintaining reliable detection of the formats that are actually present
Data Source
AI summary
Methods, systems, and devices for wireless communications are described for processing downlink control information (DCI) for scheduling multiple cells. A user equipment (UE) may receive indications of a resource set (e.g., one or more search spaces) for downlink control signaling. The resource set may include a first set of candidates for DCI that supports multi-cell scheduling (e.g., cross-cell scheduling) for a set of cells, and multiple second sets of candidates for DCI that supports single-cell scheduling of a respective cell (e.g., self-scheduling, cross-carrier scheduling). The UE may monitor the resource set for DCI that schedules communications (e.g., uplink communications, downlink communications, or both) via the set of cells based on the indications of the resource set. The UE may receive one or more instances of DCI, and communicate via at least one of the cells of the set based on the received one or more instances of DCI.