Listen Again After Talk Collision Detection in Wireless Broadcast
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Solution Overview
Problem
Current wireless communication systems face challenges in detecting collisions during multi-cast and broadcast transmissions using Listen-Before-Talk (LBT) procedures, particularly in unlicensed access mediums, leading to potential collisions and inefficient medium utilization.
Innovation Solution
Implementing a Listen Again After Talk (LAAT) procedure, where wireless devices adjust their transmission schedules and LBT parameters based on detected collisions, using modified transmission frames with randomized timing and configuration to detect collisions and optimize access medium usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Listen-Before-Talk (LBT) procedure is used to determine whether accessing the carrier is allowed, then medium access control is improved, but collision detection capability deteriorates
Solution Approach 1:
The patent introduces a preliminary listening period within the transmission frame structure, where the wireless device listens for collisions before actually transmitting data. This preliminary action (listening) is taken in advance of the main transmission activity, allowing the device to detect potential collisions early and adjust its transmission schedule accordingly, thus resolving the contradiction between maintaining LBT-based medium access control and improving collision detection capability
2Device complexity
If transmission frames are scheduled at fixed intervals, then transmission scheduling simplicity is improved, but collision probability increases
Solution Approach 1:
The patent makes the transmission frame timing dynamic by introducing randomization within a defined window. Instead of fixed periodic scheduling, the transmission frames are scheduled at randomized times within a configurable window, which maintains reasonable scheduling simplicity while significantly reducing collision probability through temporal dispersion of transmissions
Solution Approach 2:
The patent changes the timing parameter from a fixed value to a randomized value within a window. This parameter change allows the system to maintain the simplicity of scheduled transmission while introducing variability that reduces collision probability, directly resolving the contradiction between scheduling simplicity and collision avoidance
3Measurement precision
If Listen Again After Talk (LAAT) procedure is implemented with randomized timing, then collision detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the transmission frame into distinct functional parts: a listening period for collision detection and a data transmission period. This segmentation allows the device to perform collision detection with improved accuracy during the listening period while keeping the overall device complexity manageable by clearly defining the boundaries and purposes of each segment
Data Source
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AI summary
Apparatuses, systems, and methods for a wireless device to perform methods to implement mechanisms for performing a listen again after talk procedure to detect collisions over an access medium. The wireless device may determine a frequency and configuration of modified transmission frames for transmission over an access medium (licensed or unlicensed) and may further determine a timing of the modified transmission frames within a transmission occasion. The wireless device may detect, during a listening period of the modified transmission frame, a collision and may adjust, based, at least in part, on the detected collision, a remaining transmission schedule for the transmission schedule and/or LBT parameters.