Search Space Monitoring for Cross-Carrier PDCCH Overhead
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Solution Overview
Problem
In carrier aggregation scenarios of the NR system, configuring multiple cells or carriers for user equipment (UE) leads to increased PDCCH overhead and blocking of UEs due to the need for multiple DCIs for scheduling, especially when a secondary cell schedules a primary cell.
Innovation Solution
The UE determines the number of blind detections in a search space based on target information, including configuration and resource allocation, allowing it to monitor the search space directly without relying on multiple DCIs, thereby optimizing resource allocation and reducing blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple cells or carriers are configured and activated for UE in carrier aggregation scenario, then scheduling flexibility and system capacity are improved, but PDCCH overhead increases and UE blocking occurs due to requirement of multiple DCIs
Solution Approach 1:
The patent combines multiple search spaces (first target SS and second target SS) into a unified monitoring structure where the UE monitors both search spaces within the same time-frequency resources. This merging approach allows multiple DCIs to be transmitted without proportionally increasing PDCCH overhead, as the UE performs joint monitoring rather than separate monitoring of each search space independently.
Solution Approach 2:
The patent creates a universal search space configuration that serves multiple functions: it can carry DCI for primary cell scheduling, DCI for secondary cell scheduling, and support both self-scheduling and cross-carrier scheduling modes. This multi-functional search space structure reduces the need for separate dedicated search spaces for different scheduling scenarios, thereby reducing overall PDCCH overhead.
2Adaptability or versatility
If multiple DCIs are required for scheduling multiple cells, then carrier aggregation scheduling capability is improved, but UE blocking occurs during search space monitoring
Solution Approach 1:
The patent performs preliminary configuration of search space sets with pre-defined parameters including monitoring occasions, time offsets, and resource allocations. By pre-configuring the first target SS and second target SS with their respective monitoring parameters, the UE can efficiently prepare for receiving multiple DCIs without experiencing blocking during actual scheduling operations. The pre-established structure allows the UE to systematically process multiple search spaces.
3Productivity
If blind detection resource allocation is increased to support multiple cells, then scheduling capacity is improved, but resource allocation efficiency decreases
Solution Approach 1:
The patent segments the blind detection resources by creating distinct search space sets (first target SS and second target SS) with separate configuration parameters. Each search space set can be independently configured with specific monitoring occasions, time offsets, and resource allocations. This segmentation allows the system to support multiple cells and scheduling scenarios while maintaining efficient resource allocation within each segmented search space, preventing resource waste and improving overall allocation efficiency.
Data Source
AI summary
An SS monitoring method and a device. The method includes: obtaining target information, where the target information includes at least one of the following: configuration information of a first target SS and blind detection resource allocation information of the first target SS, the configuration information is used to indicate the number of blind detections in the first target SS, the blind detection resource allocation information is used to allocate the number of blind detections to an SS in the first target SS, and the number of blind detections includes at least one of the following: the number of downlink control channel candidates and the number of channel estimations; and monitoring a second target SS in the first target SS based on the target information.