User Terminal Synchronization Raster Search Control
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Solution Overview
Problem
In future radio communication systems like 5G, the difficulty in narrowing down search candidate positions for synchronization rasters during initial access due to non-central frequency positioning of synchronization signal blocks increases latency and power consumption, as existing methods are inefficient in notifying the user terminal about the correct search positions.
Innovation Solution
A user terminal that receives a synchronization signal block with specific information elements, such as a subcarrier offset and downlink control channel information, to determine the absence of control resource sets and adjust its search based on code points, allowing for effective notification control of synchronization raster positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user terminal searches for synchronization raster at non-center frequency positions during initial access, then the synchronization signal block can be received, but the search load and time required increase significantly
Solution Approach 1:
The base station performs preliminary action by transmitting indication information in the synchronization signal block that specifies the frequency position of the synchronization raster. This allows the user terminal to skip the exhaustive search process and directly access the correct frequency position, thereby reducing initial access time while ensuring reliable synchronization signal reception.
2Reliability
If the user terminal performs exhaustive search for synchronization raster positions, then the correct position can be found, but power consumption increases
Solution Approach 1:
The base station provides feedback information through the synchronization signal block, indicating the specific frequency position where the synchronization raster is located. This feedback mechanism enables the user terminal to adjust its search strategy accordingly, avoiding unnecessary scanning of other frequency positions and thereby reducing power consumption while ensuring reliable detection.
3Device complexity
If the synchronization raster position information is not properly notified to the user terminal, then the system maintains simplicity, but throughput decreases
Solution Approach 1:
The synchronization signal block serves multiple functions: it provides synchronization signals, transmits broadcast information, and simultaneously conveys the frequency position indication of the synchronization raster. By making the synchronization signal block multi-functional, the system notifies the user terminal of the correct search position without adding separate notification mechanisms, thus maintaining simplicity while improving throughput.
Data Source
AI summary
To appropriately perform notification control related to a synchronization raster position, one aspect of the user terminal according to the present disclosure includes: a reception section that receives a synchronization signal block including a first information element related to a subcarrier offset, and a second information element related to a downlink control channel for system information; and a control section that, when a given code point is indicated in the first information element, recognizes an absence of a control resource set for the system information associated with the synchronization signal block, and determines an information type to be notified based on a code point included in the second information element.