SSB-Linked PDCCH Scheduling to Reduce Blind Detection
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Solution Overview
Problem
In non-terrestrial networks, terminals face issues with high power consumption and access delays due to unnecessary blind detection of physical downlink control channel (PDCCH) in overlapping search spaces, affecting access performance in satellite communication systems.
Innovation Solution
A method to determine the position of PDCCH monitoring occasions (PMOs) based on SSBs, ensuring they are non-overlapping and distributed in time, reducing unnecessary blind detection and power consumption while maintaining access performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs PDCCH blind detection in all search spaces including overlapping positions, then the access performance is maintained, but the power consumption increases and blind detection efficiency decreases
Solution Approach 1:
The patent extracts and removes the overlapping search space positions from the terminal's blind detection process. By determining that certain PMO positions overlap with SSB positions where no PDCCH transmission occurs, the terminal excludes these positions from blind detection, thereby reducing power consumption without affecting access performance.
Solution Approach 2:
Instead of determining which positions to detect, the patent inverts the approach by determining which positions to exclude from detection. The terminal identifies overlapping positions between search spaces and SSBs, and intentionally skips blind detection at these positions, achieving power savings while maintaining reliable access.
2Productivity
If the terminal performs blind detection at overlapping PMO positions, then no access delays occur, but the blind detection efficiency becomes low
Solution Approach 1:
The patent extracts unnecessary blind detection operations from the terminal's process by identifying and removing overlapping PMO positions. This eliminates wasted detection attempts, improving blind detection efficiency without causing access delays since no valid PDCCH transmissions occur at these overlapping positions.
3Productivity
If the RAR message receive window is centrally distributed in one half-frame, then the terminal can receive RAR efficiently, but some terminals may fail to receive RAR affecting access performance
Solution Approach 1:
The patent segments the RAR message reception process by allowing the receive window to span across frame boundaries. Instead of confining the window to a single half-frame, the terminal can receive RAR messages that are distributed across different frames, ensuring reliable reception without sacrificing efficiency.
Data Source
AI summary
A communication method is provided, including: a position of a PMO in each search space group may be determined based on at least an SSB in a corresponding SSB group, a monitoring periodicity of a PDCCH, duration of the PDCCH, and a plurality of parameters, where the monitoring periodicity is greater than the duration, and values of the plurality of parameters are related to a quantity of PMOs in each search space group and a quantity of system frames of offsetting between two adjacent search space groups. In this way, a system frame in which the determined position of the PMO in the search space group is located is between system frames in which two adjacent SSB groups are located, and there is offsetting of more than one slot between at least two adjacent PMOs in the group. Therefore, avoiding unnecessary blind detection of a terminal and reducing power consumption.