RRC Parameter Structures for PDCCH Search Space Configuration
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G cellular systems, face limitations in flexibility and efficiency for supporting multiple service types such as eMBB, URLLC, and mMTC, especially in configuring search spaces and aligning DCI sizes for efficient communication.
Innovation Solution
The method involves a user equipment (UE) and base station exchanging RRC parameters with specific information element structures to define search spaces and DCI formats, allowing for UE-specific and common search spaces, enabling efficient monitoring of PDCCH candidates and DCI size alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single search space configuration is used for all DCI formats, then device complexity is reduced, but adaptability for multiple service types (eMBB, URLLC, mMTC) deteriorates
Solution Approach 1:
The patent segments the search space configuration into multiple independent configurations, each optimized for specific service types (eMBB, URLLC, mMTC). Each search space configuration can have tailored parameters such as monitoring occasions, aggregation levels, and DCI format restrictions, allowing the system to adapt to different service requirements without increasing overall system complexity through modular management.
Solution Approach 2:
The patent enables dynamic selection and switching between different search space configurations based on the active service type. The system can dynamically activate or deactivate specific search space configurations according to service requirements, allowing flexible adaptation to changing communication needs while maintaining manageable complexity through on-demand configuration activation.
2Adaptability or versatility
If multiple search space configurations are supported for different service types, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent implements a universal search space configuration framework that can serve multiple service types through a standardized configuration structure. The framework defines common parameter sets and configuration templates that can be reused across different service types, reducing the need for entirely separate configurations for each service and thereby managing complexity while maintaining adaptability.
Solution Approach 2:
The patent manages complexity by parameterizing search space configurations with service-specific parameters that can be adjusted without changing the overall configuration structure. By defining configurable parameters such as monitoring periodicity, aggregation levels, and DCI format associations, the system can adapt to different services through parameter variation rather than structural redesign, keeping device complexity manageable.
3Speed
If DCI size alignment is not performed, then processing speed increases, but communication reliability deteriorates due to size mismatch
Solution Approach 1:
The patent performs DCI size alignment as a preliminary action during the configuration phase, before actual DCI transmission and processing. By pre-calculating and aligning DCI sizes for different formats and service types, the system eliminates the need for runtime size adjustments, ensuring both reliability through consistent sizing and speed through avoidance of processing delays.
Solution Approach 2:
The patent uses parameter changes to achieve DCI size alignment by adjusting configuration parameters such as payload size, format selection, and field inclusion/exclusion. These parameter adjustments are made in a controlled manner during configuration, allowing the system to maintain reliable communication through consistent DCI sizing while minimizing impact on processing speed through efficient parameter management.
Data Source
AI summary
A method by a user equipment (UE) is described. The method includes receiving, from a base station, a first radio resource control (RRC) parameter with a first information element structure to define how and where to search for PDCCH candidates of a search space set, receiving a second RRC parameter with a second information element structure to define how and where to search for PDCCH candidates of a search space set, and a search space set corresponds to two types of search space set, wherein the first information element structure is capable of indicating of which one of the two types the search space set is, the second information element structure is only capable of indicating one fixed type.