Terminal Device Downlink Control Channel Detection Using Multiple Search Space Sets
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Solution Overview
Problem
Current wireless communication technologies face challenges in simultaneously transmitting multiple downlink control channels to terminal devices, which is essential for efficient communication in new radio (NR) systems.
Innovation Solution
The method involves using multiple groups of search spaces or CORESETs to detect M downlink control channels, allowing different groups to be used for different control channels, thereby eliminating the need for terminal devices to detect all channels in each search space, which reduces power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple downlink control channels are transmitted through multiple TRPs or beams simultaneously, then communication reliability and capacity are improved, but terminal device power consumption increases due to detecting all channels in each search space
Solution Approach 1:
The search space is segmented into multiple search space sets, with each set associated with a specific downlink control channel. The terminal device only needs to detect channels within its assigned search space set rather than scanning all channels in the entire search space, thereby reducing power consumption while maintaining the ability to receive multiple control channels simultaneously through different TRPs or beams.
2Measurement precision
If the terminal device detects all downlink control channels in each search space, then channel detection completeness is improved, but detection complexity and processing overhead increase
Solution Approach 1:
Different search space sets are configured with different detection requirements and associations. Each search space set is optimized for its specific purpose (e.g., common control channels vs. dedicated control channels), allowing the terminal device to apply different detection strategies to different sets, thereby reducing overall detection complexity while ensuring complete detection of relevant channels.
3Ease of operation
If one-to-one mapping between NR-PDCCH and CORESET group is implemented, then channel management is simplified, but flexibility in configuring multiple control channels is reduced
Solution Approach 1:
The search space set structure is designed to be multi-functional, capable of supporting both one-to-one mapping scenarios and many-to-one mapping scenarios. Each search space set can be independently configured and associated with different downlink control channels based on network requirements, providing universal applicability for various deployment scenarios while maintaining simplified management through the standardized set structure.
Data Source
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AI summary
Provided is a wireless communication method, capable of implementing simultaneous transmission over multiple downlink control channels, the method comprising: a terminal device utilizes N search space/control resource sets to detect M downlink control channels, N being an integer greater than or equal to 2, and M being an integer greater than or equal to 2. Different search space/control resource sets are utilized to detect different downlink control channels.