SSB Scheduling in Full-Duplex Slots to Limit Uplink Self-Interference
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Solution Overview
Problem
Full-duplex communication systems face challenges with self-interference due to signal leakage between transmission and reception in the same frequency band, particularly when synchronization signal blocks (SSBs) overlap with uplink bands in full-duplex slots.
Innovation Solution
Base stations employ techniques such as muting, puncturing, frequency-shifting, or partitioning SSBs to exclude or align them within the downlink band in full-duplex slots, and UEs adjust their uplink transmissions accordingly to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SSB transmission is performed in full-duplex slots overlapping with uplink band, then communication flexibility and resource utilization are improved, but self-interference and signal quality deteriorate
Solution Approach 1:
The patent segments the SSB transmission by dividing it into multiple parts (first SSB and second SSB) that can be transmitted in different slots. This allows the system to transmit synchronization signals while avoiding full-duplex conflicts in a single slot, thereby maintaining communication flexibility while reducing self-interference through temporal separation of transmission components.
2Productivity
If SSB transmission schedule is preconfigured to overlap with uplink band in full-duplex slots, then resource utilization is improved, but transmission reliability and signal quality worsen due to interference
Solution Approach 1:
The patent implements dynamic slot configuration where the network device can flexibly adjust slot types (downlink-only, uplink-only, or full-duplex) based on traffic conditions and interference levels. This dynamic adaptation allows the system to optimize resource utilization while maintaining transmission reliability by avoiding rigid preconfiguration that would cause persistent interference issues.
Solution Approach 2:
The patent changes the temporal parameter of SSB transmission by distributing SSB components across different time slots rather than transmitting them simultaneously in one slot. This parameter change transforms the transmission from a single time-instance operation to a multi-time-instance operation, reducing peak interference while maintaining overall resource utilization.
3Loss of time
If SSB and uplink transmission occur simultaneously in full-duplex mode, then latency is reduced, but communication reliability deteriorates due to signal leakage
Solution Approach 1:
The patent segments the synchronization signal transmission into multiple parts transmitted in different time slots, which prevents simultaneous transmission conflicts while maintaining low latency through efficient use of available slots. This segmentation approach allows the system to avoid the worst-case interference scenarios while still achieving fast synchronization.
Data Source
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AI summary
Methods related to wireless communication systems and transmission and/or reception of synchronization signal block (SSB) transmissions are provided. In some scenarios, communications may occur in one or more full-duplex slots. For example, a wireless communication device receives a synchronization signal block (SSB) transmission schedule. The SSB transmission schedule at least partially overlapping with an uplink (UL) frequency portion of a full-duplex slot. The wireless communication device receives one or more SSBs, where the one or more SSBs are received in at least a slot different than the full-duplex slot or in a DL frequency portion of the full-duplex slot. Other features are also claimed and described.