Common Reference Signals for Coreset Search Space Merging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, transmitting common and UE-specific control information in the same control resource set (coreset) increases signaling overhead, particularly when multiple coresets are required, and can be resource-intensive, especially in scenarios like mmWave systems where base stations may lack sufficient resources.
Innovation Solution
The method involves encoding or scrambling reference signals in both the common search space (CSS) and UE-specific search space (USS) of a coreset using a common sequence, such as a radio network temporary identifier (RNTI), allowing user equipment (UE) to perform channel estimation and decode control information efficiently within the same coreset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple coresets are configured to transmit common control information and UE-specific control information separately, then control information transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent combines common search space (CSS) and UE-specific search space (USS) into a single control resource set (coreset). This merging allows both common control information and UE-specific control information to be transmitted within the same coreset, reducing the number of separate coreset configurations needed and thereby decreasing signaling overhead while maintaining transmission reliability
Solution Approach 2:
The patent creates a universal coreset structure that can handle multiple functions simultaneously - transmitting both common control information (CCCH) and UE-specific control information (DCI) within the same resource set. This multi-functional coreset eliminates the need for separate dedicated coresets for different control information types, reducing overall signaling overhead
2Measurement precision
If multiple coresets are configured for common and UE-specific control information, then control information decoding accuracy is improved, but resource consumption increases
Solution Approach 1:
By merging CSS and USS into a single coreset, the patent reduces the total number of coreset configurations required in the system. This consolidation decreases resource consumption related to coreset management, configuration signaling, and maintenance while preserving the ability to accurately decode both common and UE-specific control information within the unified structure
3Reliability
If separate coresets are used for common and UE-specific control information, then control information transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent simplifies base station configuration by merging CSS and USS into a single coreset. This reduces the number of separate coreset configurations that must be managed, monitored, and maintained, thereby decreasing device complexity at the base station while preserving reliable transmission of both common and UE-specific control information through the unified structure
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. In some wireless communications systems, a base station may transmit control information to a user equipment (UE) in a control resource set (coreset) of a transmission time interval (TTI). As described herein, the base station may transmit common control information in a common search space (CSS) of the coreset and a UE-specific control information in a UE-specific search space (USS) of the same coreset. In addition, the base station may transmit reference signals in the coreset to allow the UE to perform channel estimation to correctly decode or demodulate the control information in the CSS and USS of the coreset. In some examples, the reference signals transmitted in the CSS and USS of the coreset may include a common sequence for the coreset.