Flexible Transmission Grid Subframe Scheduling
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Solution Overview
Problem
The rigid subframe structure in wireless communication systems limits flexibility in transmission scheduling, leading to increased latency and inefficiencies in unlicensed spectrum operations, as transmissions must start at fixed boundaries, restricting the ability to grab channels quickly and introducing unnecessary overhead.
Innovation Solution
The method involves identifying major and minor reference points within a subframe, allowing transmissions to begin on minor reference points between major points, enabling flexible scheduling of transmission intervals, start times, and durations, which can start immediately after a listen-before-talk procedure without requiring dummy signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If transmissions are restricted to start at subframe boundaries, then synchronization is simplified and system structure is maintained, but latency increases and channel grabbing capability deteriorates
Solution Approach 1:
The subframe structure is segmented into multiple reference points (major reference points at subframe boundaries and minor reference points within subframes). This segmentation allows transmissions to start at either major or minor reference points depending on the specific requirement, thereby reducing latency for time-critical transmissions while preserving the original subframe synchronization structure for other purposes.
Solution Approach 2:
The transmission start time is made dynamic by allowing selection between major reference points (fixed subframe boundaries) and minor reference points (flexible intermediate points). This dynamic approach enables the system to adapt transmission timing to specific needs such as channel availability in unlicensed spectrum or latency requirements, rather than being statically constrained to subframe boundaries only.
2Adaptability or versatility
If transmissions must wait for subframe boundaries, then system synchronization is maintained, but channel grabbing likelihood decreases and overhead increases
Solution Approach 1:
By dividing the subframe into multiple reference points, the system enables transmissions to start at the most appropriate point (major or minor) based on channel conditions and timing requirements. This segmentation increases adaptability for channel grabbing in unlicensed spectrum while the reference point structure itself maintains synchronization organization.
Solution Approach 2:
The system changes the timing parameter by introducing minor reference points with different time offsets within subframes. This allows transmission timing to be adjusted according to specific needs such as listen-before-talk completion times, improving channel grabbing capability without fundamentally changing the subframe synchronization framework.
3Productivity
If dummy signals are transmitted to reach subframe boundaries, then transmission timing is simplified, but overhead increases and spectrum efficiency decreases
Solution Approach 1:
The system performs preliminary identification of appropriate reference points (major or minor) before transmission. This preliminary action allows the transmitter to select the optimal start time in advance, eliminating the need for dummy signals to fill time until subframe boundaries and improving spectrum efficiency.
Solution Approach 2:
The invention extracts the essential synchronization function from the rigid subframe boundary requirement by introducing minor reference points that provide sufficient timing reference without requiring full subframe alignment. This extraction eliminates unnecessary wait times and dummy signals while preserving the needed synchronization capability.
Data Source
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AI summary
A system and method for scheduling a transmission of a message in a communication system. In an embodiment, the method (1000) includes identifying (1020) major reference points (410) and minor reference points (420) associated with a subframe (440). The method (1000) also includes scheduling (1030) a transmission of the message (400) to begin on one of the minor reference points (420) between the major reference points (410).