Uplink Time Scheduling Around SSB Gaps for Passive IoT Sync
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Solution Overview
Problem
In passive IoT systems, the long uplink transmission time of active tags leads to frequency drift, affecting uplink receiving performance and causing synchronization issues.
Innovation Solution
A method to determine time domain resources for uplink data based on the presence of synchronization signals (SSB) to ensure complete SSB reception within gaps, optimizing data transmission and reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the active tag sends uplink data continuously for several seconds, then the data transmission volume increases, but the component temperature increases causing frequency drift and degrading uplink receiving performance
Solution Approach 1:
The patent divides continuous uplink data transmission into periodic segments separated by SSB reception intervals. The active tag alternates between sending uplink data and receiving SSB signals from the reader, creating a periodic transmission pattern that prevents continuous operation and associated frequency drift while still achieving substantial data transmission volume over time.
2Productivity
If the gap between uplink data transmissions is shortened to increase transmission efficiency, then productivity improves, but the ability to receive complete SSB signals deteriorates
Solution Approach 1:
The patent calculates and determines the time domain resource positioning of uplink data in advance based on SSB configuration parameters and uplink data characteristics. By pre-determining the timing relationship between SSB reception and uplink data transmission, the system ensures that uplink data is positioned in time domain resources that do not overlap with SSB signals, guaranteeing complete SSB reception while optimizing transmission efficiency.
3Quantity of substance
If uplink data transmission time is extended to send more data, then data volume increases, but frequency drift occurs due to component temperature rise
Solution Approach 1:
The patent introduces SSB reception as an intermediary action between uplink data transmission segments. The SSB reception interval serves as a cooling period that allows the active tag's components to cool down, preventing excessive temperature rise and associated frequency drift. This intermediary action breaks the continuous transmission that causes harmful thermal effects while still enabling substantial data transmission over the overall communication period.
Data Source
AI summary
A data transmission method and an apparatus. The method includes: a first apparatus determines a time domain resource of first uplink data based on whether a first time segment includes a complete synchronization signal and physical broadcast channel block (SSB). The first apparatus sends the first uplink data based on the time domain resource of the first uplink data. A start moment of the first time segment is n1+X+t1, an end moment is n1+X+Y1−t2, n1 is a start moment of the first uplink data, X is a maximum duration for one time of uplink data sending, Y1 is a duration occupied by a gap between the first uplink data and second uplink data, t1 is a preparation duration between sending and receiving of the first apparatus, t2 is a preparation duration between receiving and sending of the first apparatus.