Downlink Control Resource Segmentation for Low-Latency URLLC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 5G downlink control channel designs fail to meet the low latency requirements of URLLC services due to Time Division Multiplexing (TDM) with eMBB, leading to unscheduled URLLC services and increased processing burden and battery consumption in eMBB terminals.
Innovation Solution
Implementing a method that uses pre-configured or semi-statically configured control resource areas in the time domain scheduling unit, where different types of control resource areas are dedicated for various downlink control information types, including a first type for low latency services, allowing continuous transmission and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Time Division Multiplexing (TDM) is adopted for downlink control channel transmission, then resource sharing between eMBB and URLLC is achieved, but low latency requirement of URLLC cannot be guaranteed
Solution Approach 1:
The downlink control channel resources are segmented into multiple types of control resource areas, with different types dedicated to different service scenarios. Specifically, first type control resource areas are configured for URLLC services while second type control resource areas are configured for eMBB services, allowing simultaneous independent transmission without TDM waiting delays
Solution Approach 2:
The patent transitions from time-domain multiplexing to frequency-domain multiplexing by allocating different control resource areas in the frequency domain. Multiple PDCCH formats can be transmitted simultaneously on different frequency resources within the same time slot, eliminating the time switching delay inherent in TDM while maintaining resource sharing
2Productivity
If TDM multiplexing is used for downlink control channel, then resource utilization is improved, but processing burden and battery consumption increase for eMBB terminals
Solution Approach 1:
Different control resource areas are assigned different properties and configurations suitable for their specific service types. URLLC control resources use formats optimized for low latency with shorter processing requirements, while eMBB control resources use formats optimized for high throughput. Terminals only need to process the control formats relevant to their service type, reducing overall processing burden
Solution Approach 2:
Control resource areas are pre-configured with specific formats and parameters appropriate for each service type before transmission. URLLC terminals are pre-configured with first type control resource areas and corresponding PDCCH formats, allowing them to directly decode URLLC scheduling information without attempting to process eMBB control formats, thereby reducing processing energy
3Reliability
If multiple PDCCH formats are transmitted simultaneously, then service-specific optimization is achieved, but terminal blind detection complexity increases
Solution Approach 1:
The control resource space is segmented into distinct first type and second type control resource areas, with each type associated with specific PDCCH formats. This segmentation allows terminals to focus their blind detection efforts on specific format types based on their service requirements, rather than attempting to detect all possible formats across the entire control resource space
Solution Approach 2:
Control resource indicator information acts as an intermediary that guides terminals to the appropriate control resource areas for their specific service type. This indicator information enables terminals to efficiently locate and decode only the relevant PDCCH formats without exhaustive blind detection across all control resources
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Embodiments of the present invention disclose a method, a network device and a terminal device for transmitting information. The method includes: a network device sends downlink control information to a terminal device through control resource areas in a time domain scheduling unit, wherein the control resource areas include multiple types of control resource areas, different types of control resource areas are used for sending different types downlink control information, and a first type of control resource area in the multiple types of control resource areas comprises partial frequency domain resources pre-configured or semi-statically configured on each Orthogonal Frequency Division Multiplexing (OFDM) symbol in the time domain scheduling unit. By the method, the network device and the terminal device in the embodiments of the present invention, multiple types of downlink control information can be transmitted, and a design of the first type of control resource area can meet requirement on the downlink control channel for transmitting a low latency service.