CORESET Multiplexing of Multiple Search Spaces via Code-Division PDCCH
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Solution Overview
Problem
Existing wireless communication systems face limitations in PDCCH transmission capacity and reliability, particularly for low-power wide-area devices, due to resource exhaustion and scheduling bottlenecks caused by PDCCH repetition and high aggregation levels, leading to inefficiencies and reduced network responsiveness.
Innovation Solution
Implementing code-division multiplexing techniques to multiplex multiple PDCCH transmissions within a single CORESET using orthogonal cover codes, allowing simultaneous transmission of control channels for different UEs without resource monopolization, thereby enhancing PDCCH capacity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH repetition and high aggregation levels are used to improve reliability, then reliability is improved, but resource exhaustion and scheduling bottlenecks occur
Solution Approach 1:
The patent merges multiple search spaces into a single CORESET, allowing multiple PDCCH transmissions to share the same time-frequency resources through code-division multiplexing. This combining approach enables reliable PDCCH delivery to multiple UEs simultaneously without requiring separate dedicated resources for each search space, thus improving reliability while preventing resource exhaustion
Solution Approach 2:
The patent introduces code-domain multiplexing as an additional dimension for resource separation. Instead of relying solely on time-frequency resource separation, the invention uses orthogonal cover codes to multiplex PDCCH transmissions in the code domain, effectively adding another dimension to resource allocation that increases capacity without consuming additional time-frequency resources
2Productivity
If multiple search spaces are multiplexed within a single CORESET, then resource utilization is improved, but complexity of managing multiple search spaces increases
Solution Approach 1:
The patent makes the CORESET structure universal by enabling it to serve multiple search spaces simultaneously. A single CORESET configuration can accommodate multiple search spaces with different monitoring parameters, aggregation levels, and target UEs, eliminating the need for separate CORESET configurations for each search space and reducing overall system complexity
Solution Approach 2:
The patent changes the configuration parameters of the CORESET to support multi-search-space operation. By configuring the CORESET with parameters that allow code-division multiplexing and by associating multiple search space configurations with a single CORESET ID, the system enables flexible search space management without increasing structural complexity
3Quantity of substance
If code-division multiplexing is applied to multiplex multiple PDCCH symbols, then resource utilization is improved, but complexity of orthogonal code management increases
Solution Approach 1:
The patent segments the control channel resources by assigning different orthogonal cover codes to different search spaces or PDCCH transmissions within the same CORESET. This segmentation in the code domain allows multiple PDCCH symbols to be transmitted simultaneously on the same time-frequency resources while maintaining distinguishability, thereby increasing the number of effective control channel transmissions without requiring additional physical resources
Data Source
AI summary
Various aspects of the present disclosure relate to multiplexing search spaces within a control resource set (CORESET). A base station can map a first search space and a second search space to a first CORESET corresponding to a physical downlink control channel (PDCCH). Additionally, the base station can multiplex, using a code-division multiplexing technique, a first PDCCH symbol and a second PDCCH symbol. The first PDCCH symbol can be transmitted in the first search space of the first CORESET and the second PDCCH symbol can be transmitted in the second search space of the first CORESET. Moreover, the base station can transmit, using the first search space of the first CORESET, the first PDCCH symbol to a first set of user equipments (UEs). Furthermore, the base station can transmit, using the second search space of the first CORESET, the second PDCCH symbol to a second set of UEs.