PDCCH Search Space Configuration for Dynamic Unlicensed 5G Channels
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Solution Overview
Problem
The challenge in configuring a flexible search space for user equipment in an unlicensed 5G communications system, where the uncertainty of channel availability due to clear channel assessment leads to missed signal transmission opportunities, necessitating a method to ensure timely reception of downlink control information.
Innovation Solution
A method and apparatus for user equipment and network-side devices to monitor synchronization signal blocks, obtain configuration information including QCL modulus and discovery reference signal transmission window, and determine the position of a physical downlink control channel PDCCH based on time synchronization information, enabling flexible search space configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clear channel assessment is performed in unlicensed 5G communications system, then channel access reliability is improved, but search space positioning flexibility deteriorates due to uncertainty of channel availability
Solution Approach 1:
The network side performs clear channel assessment before transmitting PDCCH, and pre-determines the search space position based on the assessment result. This preliminary action ensures that the search space is positioned at a time when the channel is confirmed to be available, resolving the contradiction between reliability and flexibility by making the positioning decision before transmission.
Solution Approach 2:
The UE monitors the search space at the position indicated by the network side and provides feedback on reception status. The network side uses this feedback to adjust future clear channel assessment and search space positioning strategies, creating a closed-loop system that improves both reliability and adaptability over time.
2Ease of manufacture
If fixed slot search space configuration is used in licensed 5G system, then configuration simplicity is improved, but adaptability to dynamic channel conditions deteriorates
Solution Approach 1:
The patent transforms the fixed slot search space configuration into a dynamic configuration where the search space position is determined based on clear channel assessment results. The network side can flexibly adjust the search space timing according to actual channel conditions, achieving both simplicity through automated determination and adaptability to dynamic environments.
Solution Approach 2:
The search space position parameter is changed from a fixed value to a dynamically determined value based on channel assessment. This parameter change allows the system to adapt to varying channel conditions while maintaining a relatively simple configuration process through automated parameter selection.
3Adaptability or versatility
If flexible search space positioning is implemented in unlicensed system, then adaptability to channel conditions is improved, but signal transmission reliability deteriorates due to missed transmission opportunities
Solution Approach 1:
The network side performs clear channel assessment and determines search space position before transmission, ensuring that the positioned search space corresponds to an actually available channel. This preliminary verification prevents positioning at unavailable channels, thereby maintaining both flexibility and reliability.
Solution Approach 2:
The system preemptively identifies and avoids unavailable channels through clear channel assessment before determining search space position. This preliminary anti-action prevents the harmful effect of positioning at unavailable channels, ensuring transmission reliability while maintaining flexibility in positioning.
Data Source
AI summary
This disclosure provides a search space configuration method and apparatus, and a communications device, and relates to the field of wireless communications technologies. The search space configuration method is applied to user equipment and includes: monitoring at least one synchronization signal block; obtaining configuration information of a search space corresponding to a detected synchronization signal block, where the configuration information includes QCL modulus information and/or information about a discovery reference signal transmission window; and determining a position of a search space for a physical downlink control channel PDCCH based on time synchronization information of the detected synchronization signal block and the configuration information.