Terminal Device Bandwidth Part Common Search Space Configuration
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Solution Overview
Problem
In 5G NR systems, terminal devices with bandwidth capabilities less than the system bandwidth face challenges in reducing power consumption when multiple bandwidth parts are configured, leading to increased system overheads and power consumption.
Innovation Solution
Configuring a terminal device to detect common DCI only in a specific CSS within a designated bandwidth part, reducing the need for blind detections and minimizing power consumption by activating and configuring multiple bandwidth parts in the same carrier with distinct CSS configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple bandwidth parts are configured for a terminal device, then the adaptability of the system is improved, but the power consumption of the terminal device increases
Solution Approach 1:
The patent divides the carrier bandwidth into multiple bandwidth parts (BPs), each with its own common search space (CSS). The terminal device is configured to monitor only one activated BP's CSS for common DCI, while other BPs use the same CSS for their specific DCI. This segmentation allows the system to support multiple bandwidth parts (improving adaptability) while the terminal only performs blind detections in one CSS (reducing power consumption).
Solution Approach 2:
The patent makes the first common search space (CSS) serve multiple functions: it is used for common DCI in the first bandwidth part and also for specific DCI in the second bandwidth part. This multi-functionality allows a single CSS configuration to handle control information across multiple BPs, reducing the need for separate CSS configurations and thereby reducing terminal device power consumption while maintaining support for multiple bandwidth parts.
2Adaptability or versatility
If multiple bandwidth parts are configured for a terminal device, then the system versatility is improved, but the system overheads increase
Solution Approach 1:
The patent merges the common search space resources across multiple bandwidth parts by configuring only one common CSS for the terminal device to monitor, even when multiple BPs are activated. This merging approach allows the system to support multiple bandwidth parts (improving versatility) while avoiding the overhead of configuring and maintaining separate common CSS for each BP, thereby reducing system overheads.
3Reliability
If the terminal device detects common DCI in all configured bandwidth parts, then the reliability of DCI reception is improved, but the power consumption increases
Solution Approach 1:
The patent extracts the common DCI monitoring function from multiple bandwidth parts and concentrates it in a single activated BP's common search space. The terminal device only performs blind detections for common DCI in this one CSS, while relying on the unified CSS configuration to ensure reliable reception of control information across all BPs. This extraction maintains reliability while significantly reducing power consumption by eliminating redundant blind detections.
Data Source
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AI summary
A communication method and a device are provided, to reduce power consumption of a terminal device and reduce system overheads. A communication method includes: determining, by a terminal device, that a plurality of BPs are activated, where the plurality of BPs are in a same carrier, the plurality of BPs include a first BP and a second BP, a first CSS is configured in the first BP, and common DCI is configured in the first CSS; and detecting, by the terminal device, the common DCI only in a second CSS when the second CSS is configured in the second BP, where the common DCI is configured in the second CSS.