SL Unlicensed Frame Structure LBT Slot Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing feedback mechanisms, particularly in multi-band operations, where determining the availability of time slots for transmission is complex due to the need for listen-before-talk (LBT) procedures.
Innovation Solution
The proposed solution involves an apparatus configured for communicating in a mobile wireless communication network, which performs LBT procedures within specific time intervals to determine the availability of time slots for transmission. This apparatus can use mini-slots or aggregated slots to optimize the use of available resources, allowing for flexible transmission structures and improved resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If listen-before-talk (LBT) procedures are performed in each time slot to determine availability, then transmission reliability is improved, but system complexity and time overhead increase
Solution Approach 1:
The time slot structure is segmented into distinct functional parts: a first part for LBT procedure and a second part for data transmission. This segmentation allows the LBT procedure to be confined to specific time intervals, reducing overall system complexity while maintaining reliability through structured channel access.
Solution Approach 2:
The LBT procedure is performed as a preliminary action in the first part of the time slot before data transmission begins. By completing the channel availability check in advance, the system ensures transmission reliability is maintained while the structured preliminary action reduces complexity by separating concern from execution.
2Productivity
If traditional slot structures are used without flexible division, then device complexity is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The time slot structure is made dynamic by allowing flexible division into first and second parts, where the first part duration can vary based on LBT requirements and the second part adapts to available transmission opportunities. This dynamic structure improves resource utilization efficiency by optimizing each slot's allocation without imposing complex rigid constraints on device implementation.
Solution Approach 2:
The time slot parameters are changed by introducing variable duration segments: the first part duration is adjusted based on LBT procedure length, and the second part duration is optimized for actual data transmission needs. These parameter changes enable efficient resource utilization while maintaining manageable device complexity through standardized flexibility.
3Reliability
If LBT procedure duration is extended to ensure channel availability, then transmission reliability improves, but time overhead increases
Solution Approach 1:
The time slot is segmented such that the LBT procedure occupies only the first part, with the second part reserved for data transmission. This segmentation confines the time overhead of LBT to a defined portion, ensuring channel access reliability is achieved through adequate LBT duration while preventing excessive time loss by limiting LBT to the first segment only.
Solution Approach 2:
The duration parameter of the first part is optimized to balance LBT thoroughness with time efficiency. By adjusting the first part duration based on channel conditions and requirements, the system achieves reliable channel access while minimizing time overhead, with the second part automatically compensating to maintain overall slot efficiency.
Data Source
AI summary
An apparatus configured for communicating in a mobile wireless communication network, the apparatus having a wireless interface for transceiving wireless signals in the mobile wireless communication network is configured for communicating over a sidelink, SL, in the mobile wireless communication system, the sidelink providing for a plurality of time slots, each time slot having a slot duration. The apparatus is configured for using at least a first time interval of the slot duration, to perform a listen-before-talk, LBT, procedure to determine an availability of the time slot; and to use a second time interval of the slot duration for a wireless transmission based on the determined availability; and/or for using at least a first slot duration, to perform a listen-before-talk, LBT, procedure to determine an availability of a later second time slot and to use the second time slot for a wireless transmission based on the determined availability.