Multi-Subcarrier PDCCH Mapping for Flexible Terminal Scheduling
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Solution Overview
Problem
Current communications systems face challenges in scheduling terminal devices that support different subcarrier spacings, as they are typically limited to a single type of subcarrier spacing, which restricts flexibility in service delivery and deployment scenarios.
Innovation Solution
A method and device configuration that enable a network device to send and receive Physical Downlink Control Channels (PDCCHs) with multiple subcarrier spacings, allowing terminal devices to determine the appropriate subcarrier spacing for communication, thereby supporting different subcarrier spacings and reducing calculation complexity in resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a communications system uses a single type of subcarrier spacing, then the system structure is simple and easy to implement, but the system cannot support terminal devices with different subcarrier spacing requirements, reducing adaptability
Solution Approach 1:
The patent segments the control channel resources by creating separate search spaces for different subcarrier spacings. The network device divides the control resource pool into multiple search spaces, each associated with a specific subcarrier spacing, allowing terminal devices to monitor only the search space corresponding to their supported subcarrier spacing. This segmentation approach enables multi-subcarrier spacing support while maintaining manageable system complexity through structured resource division.
Solution Approach 2:
The patent introduces a new dimension of resource organization by associating control channel resources with multiple subcarrier spacing types simultaneously. Instead of choosing a single subcarrier spacing, the system creates a multi-dimensional resource structure where control channels can be mapped to different subcarrier spacings based on service requirements and terminal capabilities, enabling flexible support for diverse terminal devices without fundamentally complicating the overall system architecture.
2Productivity
If the network device schedules terminal devices with different subcarrier spacings using a unified approach, then the scheduling procedure is simple, but the resource allocation efficiency is reduced due to increased calculation complexity
Solution Approach 1:
The patent segments the control channel search space into multiple independent sections, each dedicated to a specific subcarrier spacing. This segmentation allows the network device to perform resource allocation calculations separately for each subcarrier spacing type, avoiding the need to process all terminal devices uniformly. Terminal devices only need to monitor their designated search space, significantly reducing calculation complexity while improving resource allocation efficiency through targeted, specialized processing.
Solution Approach 2:
The patent applies local quality by optimizing the control channel configuration specifically for each subcarrier spacing type. Each search space is tailored with appropriate parameters (such as monitoring periodicity, aggregation levels, and resource block allocations) suited to its associated subcarrier spacing characteristics. This localized optimization enables efficient resource allocation for each subcarrier spacing without compromising overall system performance, reducing calculation complexity through specialized rather than generic processing.
Data Source
AI summary
The method includes: mapping, by a network device, a first PDCCH to A control channel transmission units on a first time-frequency resource, and mapping a second PDCCH to B control channel transmission units on a second time-frequency resource, where A is a positive integer and A≥2, B is a positive integer and B≥2, a subcarrier spacing of the first time-frequency resource is a first subcarrier spacing, a subcarrier spacing of the second time-frequency resource is a second subcarrier spacing, and the first subcarrier spacing is different from the second subcarrier spacing; and sending the first PDCCH and the second PDCCH.