Random Access Uplink Transmission with Conditional No-LBT Operation
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Solution Overview
Problem
Existing communication systems face challenges in efficiently transmitting and receiving uplink and downlink signals, particularly in high interference situations, due to the need for listen before talk (LBT) procedures, which can lead to transmission collisions and inefficiencies in unlicensed band operations.
Innovation Solution
A method and device for determining and configuring the operation mode of listen before talk (LBT) that allows for transmitting uplink and downlink signals without channel sensing in certain conditions, using a duty cycle and reference points based on system frame numbers or slots, and enabling no-LBT modes for efficient channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If listen before talk (LBT) procedures are performed for channel sensing, then transmission collision probability is reduced, but transmission latency and complexity increase
Solution Approach 1:
The patent applies dynamics by making the LBT operation mode adjustable and conditional rather than fixed. The system dynamically switches between performing LBT and not performing LBT based on duty cycle conditions, allowing the channel access behavior to adapt to different transmission scenarios and interference levels, thereby balancing collision avoidance with transmission efficiency
Solution Approach 2:
The patent changes the parameter of LBT operation mode from a binary state (always perform or never perform) to a conditional state based on duty cycle parameters. By introducing duty cycle thresholds and observation periods as controllable parameters, the system can adjust its channel sensing behavior to optimize between reliability and latency requirements
2Reliability
If listen before talk (LBT) procedures are performed for channel sensing, then channel access reliability is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine whether to perform LBT based on pre-configured duty cycle parameters and current transmission conditions. The device independently evaluates the duty cycle condition and makes the decision to perform or skip LBT without requiring complex centralized control or manual configuration, simplifying operation while maintaining reliability
Solution Approach 2:
The patent applies preliminary action by pre-configuring duty cycle parameters, observation periods, and LBT operation modes before actual transmission occurs. This advance configuration allows the UE to quickly determine the appropriate channel access behavior without complex real-time decision-making, reducing operational complexity while ensuring reliable channel access
3Productivity
If rapid transmission without channel sensing is performed, then transmission speed and efficiency are improved, but transmission collision probability increases
Solution Approach 1:
The patent applies dynamics by making the channel access mode flexible and conditional. The system dynamically selects between rapid transmission without LBT and conventional transmission with LBT based on whether the duty cycle condition is satisfied, allowing transmission efficiency to be maximized when conditions permit while maintaining collision avoidance when necessary
Solution Approach 2:
The patent changes the operational parameter from always performing LBT to conditionally performing LBT based on duty cycle thresholds. By introducing configurable parameters such as duty cycle percentage, observation period duration, and reference point timing, the system can adjust the balance between transmission speed and collision probability to match specific deployment requirements
Data Source
AI summary
Disclosed is a method for a terminal to transmit a first message of a random access procedure in a wireless communication system. In particular, the method comprises the steps of: receiving first information related to the configuration of the random access procedure; acquiring, on the basis of the first information, second information related to a plurality of transmission occasions for transmitting the first message; determining an observation period on the basis of reference points related to the observation period; and transmitting the first message without channel sensing through a transmission occasion, included in a period corresponding to the duty cycle of the observation period, among the plurality of transmission occasions, wherein the reference points can be configured on the basis of a specific system frame number (SFN) or a specific slot.