User Equipment Sidelink Sensing for Dynamic Channel Access
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Solution Overview
Problem
Existing wireless communication systems lack flexibility and efficiency in channel access procedures, particularly in the context of LTE and the evolving NR standards, which are expected to support diverse communication scenarios such as eMBB, mMTC, and URLLC.
Innovation Solution
A user equipment (UE) is equipped with a receiver and transmitter configured to perform sensing prior to sidelink transmission using shared spectrum channel access, determining the type of channel access procedure based on specific field values within an SCI format, enabling flexible and efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed communication structure is used, then system simplicity is maintained, but communication flexibility and efficiency are limited
Solution Approach 1:
The patent implements dynamic channel access procedures where the UE determines the type of channel access (Type 1 or Type 2) based on LBT outcomes and transmission conditions. This dynamic adaptation allows the system to switch between different access methods (immediate transmission after LBT, deferred transmission with random backoff, or contention-based access) depending on channel state and traffic requirements, thereby improving communication flexibility without requiring a completely complex restructured system
Solution Approach 2:
The patent changes key parameters of the communication structure including LBT frame structure (with defer periods, sensing slots, and contention window adjustments), channel access priority classes (Q1-Q4), and transmission timing parameters. By adjusting these parameters dynamically based on channel conditions and traffic priority, the system achieves improved flexibility and efficiency while maintaining a relatively simple base structure
2Productivity
If traditional channel access procedures are used, then system simplicity is maintained, but channel access efficiency deteriorates in shared spectrum
Solution Approach 1:
The patent segments the channel access procedure into distinct types (Type 1 for immediate transmission after successful LBT, Type 2 for deferred transmission with random backoff, and Type 3 for contention-based access). Each type has specific sub-types (2A, 2B, 2C) with different defer periods and sensing requirements. This segmentation allows the system to select the most efficient access method for each transmission scenario, improving overall channel access efficiency while keeping each individual procedure relatively simple
Solution Approach 2:
The patent implements preliminary LBT (Listen Before Talk) actions before actual data transmission, including optional preliminary LBT Type A or Type B procedures. The UE performs sensing during defer periods and contention windows before attempting transmission, and can adjust contention window sizes based on previous transmission outcomes. This preliminary action ensures efficient channel access by avoiding collisions and unnecessary transmissions, improving productivity while adding manageable complexity
Data Source
AI summary
A user equipment (UE) is described. The UE may comprise a receiver and a transmitter; wherein if values of the first field are associated with types of channel access procedure. the transmitter is configured to determine a type of channel access procedure based on a value of the first field and perform sensing prior to the sidelink transmission.