Interleaved Cell-Defining SSBs for 5G Radar Interference
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Solution Overview
Problem
High-power narrowband interferers like RADAR cause interference with initial BWP in 5G cellular deployments, preventing WTRUs from accessing the network and decoding system information due to overlapping in time and frequency domains, leading to a single point of failure in synchronization and system information exchange.
Innovation Solution
A system and method that detect and extract information from multiple cell defining SSBs, interleaving their transmissions in the time domain to mitigate interference, allowing WTRUs to read SIB1 and perform random access using RACH resources even when one SSB is impacted by interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single cell defining SSB is used for synchronization and system information exchange, then the system structure is simple and easy to implement, but the system becomes vulnerable to RADAR interference causing single point of failure
Solution Approach 1:
The patent segments the single cell defining SSB into multiple cell defining SSBs transmitted at different frequency locations. Each SSB carries essential synchronization and system information, so if one SSB is interfered with by RADAR, WTRUs can still access the network using other SSBs. This segmentation eliminates the single point of failure while maintaining manageable system structure through standardized SSB formats.
2Reliability
If multiple cell defining SSBs are transmitted at the same frequency location, then network resilience against interference is improved, but the complexity of SSB management and WTRU processing increases
Solution Approach 1:
The patent distributes multiple cell defining SSBs across different frequency locations rather than transmitting them at the same frequency. This spatial (frequency-domain) separation allows WTRUs to select an interference-free SSB for network access without complex multi-SSB processing. The frequency dimension diversification provides interference resilience while keeping the transmission framework simple and manageable.
3Adaptability or versatility
If SSB transmission uses a fixed frequency location, then the transmission protocol is simple, but the system cannot adapt to RADAR interference patterns
Solution Approach 1:
The patent implements dynamic frequency selection for cell defining SSB transmissions. The network can configure multiple SSBs at different frequency locations and adaptively select which SSBs to transmit based on detected RADAR interference patterns. WTRUs are configured with multiple potential SSB frequency locations and can adaptively select the best SSB for access. This dynamic approach provides interference adaptability while maintaining manageable complexity through standardized configuration procedures.
Data Source
AI summary
The system and method detect at least one cell defining SSB (CD-SSB), extract information associated with at least one other CD-SSB, the information including at least the absoluteFrequencyotherSSBs for the at least one other CD-SSB, extract an absoluteFrequencySSB from a network, determine if absoluteFequencySSB is in a list of absoluteFrequencyotherSSBs and if so, the CD-SSB indicated by the absoluteFrequencySSB, read the SIB1 associated with the CD-SSB indicated by the absoluteFrequencySSB and perform random access using RACH resources corresponding to the read SIB1. The system and method may further include if the absoluteFrequencySSB is determined to not be in the list of absoluteFrequencyotherSSBs, read at least one SIB1 associated with at least one other CD-SSB indicated by an absoluteFrequencyotherSSB in the list of absoluteFrequencyotherSSBs and perform random access using RACH resources corresponding to the read at least one SIB1.