Partial Subframe Signal Transmission for LTE-U Efficiency
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Solution Overview
Problem
Current methods fail to efficiently transmit signals in partial sub-frames within unlicensed frequency bands, leading to degraded LTE-U transmission efficiency due to variable channel occupancy and contention access mechanisms.
Innovation Solution
A method and device that generate and transmit signals matching the time-domain resource size of a target sub-frame, allowing for efficient signal transmission in partial sub-frames by allocating and utilizing time-frequency resources, and include modules for signal preparation and transmission, as well as reception and decoding based on determined resource sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LBE channel access mechanism is used in unlicensed frequency bands, then flexible and fair channel access is achieved, but transmission efficiency is degraded due to variable channel occupancy and partial sub-frame transmission
Solution Approach 1:
The patent applies dynamics by making the sub-frame structure adaptable rather than fixed. The base station dynamically determines whether to transmit a full sub-frame or a partial sub-frame based on channel access results from LBT procedures. This allows the system to adapt its transmission pattern to actual channel conditions while maintaining efficient resource utilization, resolving the contradiction between access flexibility and transmission efficiency.
2Reliability
If signal transmission is skipped in partial sub-frames due to contention access, then channel access fairness is maintained, but transmission efficiency is reduced by up to 25%
Solution Approach 1:
The patent applies preliminary action by performing LBT channel access procedures in advance before actual data transmission. The base station conducts Clear Channel Assessment and determines channel access timing beforehand, allowing it to plan whether to transmit full or partial sub-frames in advance. This preliminary channel access preparation enables the system to maintain fairness while minimizing efficiency losses by avoiding unnecessary idle periods.
3Stability of the object's composition
If LTE-U transmission is aligned with licensed band transmission, then system coordination is improved, but partial sub-frames are created due to LBT timing variations
Solution Approach 1:
The patent applies segmentation by dividing the sub-frame structure into two distinct types: full sub-frames and partial sub-frames. This segmentation allows the system to maintain alignment with licensed band transmission for full sub-frames while handling LBT timing variations through appropriately structured partial sub-frames. The clear distinction between these two types simplifies the overall system coordination compared to trying to create a single complex adaptive structure.
Data Source
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AI summary
Disclosed are a signal sending method, and a receiving method and device. The signal sending method comprises: according to the size of a time-domain resource which has already been acquired or which may be acquired in a target subframe, generating a sending signal matching the size of the time-domain resource; and after the time-domain resource in the target subframe is acquired, sending the sending signal matching the acquired time-domain resource in the target subframe. By means of the technical solution provided in the embodiments of the present invention, signal transmission over an incomplete subframe is realized, thereby improving the transmission efficiency.