Terminal Channel Sensing Configuration for Unlicensed Band LBT
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Solution Overview
Problem
Current communication systems lack a reliable method to configure or instruct terminals to perform Listen Before Talk (LBT) on multiple beams or Bandwidth Parts (BWP) in unlicensed frequency bands, affecting network communication reliability.
Innovation Solution
A sensing indication method that acquires and configures a target object for channel sensing or uplink transmission, including candidate spatial domain transmission filters, uplink Bandwidth Parts (BWP), and unlicensed component carriers, using higher layer signaling and physical layer signaling to indicate the target objects for LBT, ensuring channel idle detection before transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal is configured to listen on multiple beams or BWP in unlicensed frequency band, then the channel sensing coverage is improved, but the device complexity and signaling overhead increase
Solution Approach 1:
The patent segments the channel sensing configuration by introducing the concept of LBT-Beam association relationships, where different beams are associated with different LBT configurations. This allows the terminal to perform channel sensing on multiple beams independently with different parameters, improving channel sensing reliability while managing complexity through structured segmentation of the sensing process across multiple beams and BWPs
Solution Approach 2:
The patent adds a new dimension to channel sensing by introducing spatial domain transmission filters (beams) as an additional layer beyond traditional frequency domain BWP sensing. This dimensional expansion allows simultaneous sensing across multiple spatial directions and frequency bands, enhancing coverage and reliability without requiring a complete redesign of the sensing mechanism
2Reliability
If the terminal performs LBT on multiple candidate objects, then the interference reduction is improved, but the time consumption for channel sensing increases
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure multiple LBT-Beam association relationships and LBT configuration parameters before the terminal performs channel sensing. The terminal receives and stores these configurations in advance, allowing it to efficiently execute multiple LBT procedures without real-time configuration overhead, thus reducing the actual sensing time while maintaining multiple candidate object evaluation
Solution Approach 2:
The patent utilizes parameter changes by allowing different LBT configuration parameters (such as contention window sizes, backoff counters, and sensing thresholds) to be assigned to different beams and BWPs. The terminal can adaptively select and adjust parameters based on the specific candidate object being sensed, optimizing the balance between sensing thoroughness and time efficiency across multiple transmission opportunities
Data Source
AI summary
A sensing indication method, a terminal and a network device are provided. A sensing indication method is applied to a terminal and includes: acquiring a target object for channel sensing or uplink transmission; performing a channel sensing on the target object; where the target object includes at least one of: at least one candidate spatial domain transmission filter, at least one candidate uplink Bandwidth Part (BWP) and at least one candidate unlicensed component carrier.