LTE Unlicensed Spectrum Data Channel Positioning
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Solution Overview
Problem
Current data transmission methods in LTE systems using unlicensed spectrum face challenges in ensuring efficient data communication, as they often result in suboptimal resource utilization due to asynchronous time information between licensed and unlicensed spectrums, leading to inefficiencies and complexity in implementing advanced technologies.
Innovation Solution
A data transmission method that determines a reference time point within a subframe to accurately position a data channel, allowing for efficient use of spectrum resources by aligning data transmission with the seized usage opportunity, thereby improving spectral usage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission starts only in the next subframe after seizing unlicensed spectrum, then communication reliability is improved, but spectral usage efficiency deteriorates due to wasted transmission opportunities
Solution Approach 1:
The patent applies preliminary action by determining the data channel position based on the reference time point (seizure moment) rather than waiting for the next subframe boundary. This allows the system to prepare and initiate data transmission as early as possible within the current subframe, converting the wasted time between spectrum seizure and next subframe into useful transmission time, thereby improving spectral efficiency while maintaining reliability through proper timing alignment
Solution Approach 2:
The patent introduces dynamic timing adjustment by allowing data transmission to occur at variable positions within a subframe based on when the spectrum is actually seized. Instead of fixed subframe boundaries, the system dynamically determines the data channel position relative to the reference time point, enabling flexible adaptation to different spectrum seizure moments and maximizing resource utilization
2Device complexity
If data transmission position is fixed at next subframe boundary, then system complexity is reduced, but resource utilization deteriorates due to inability to utilize partial subframe opportunities
Solution Approach 1:
The patent determines the data channel position in advance based on the reference time point and timing relationship rules, allowing the system to optimize resource usage without introducing complex real-time decision-making mechanisms. The position determination follows predefined timing relationships, maintaining system simplicity while enabling flexible resource utilization
Solution Approach 2:
The patent shifts from fixed subframe-based timing to a more granular time-position dimension within the subframe. By introducing the concept of data channel position relative to the reference time point and using timing relationship rules, the system operates in an additional time dimension, enabling partial subframe utilization without sacrificing structural simplicity
3Adaptability or versatility
If asynchronous time information between licensed and unlicensed spectrums is used, then spectrum flexibility is improved, but synchronization accuracy deteriorates leading to communication inefficiency
Solution Approach 1:
The patent introduces a reference time point as an intermediary between the asynchronous licensed and unlicensed spectrum time systems. This reference point, determined based on the seizure moment and timing relationship rules, serves as a synchronization anchor that allows the system to handle asynchronous spectrums while maintaining accurate timing for data transmission, thus preserving both flexibility and precision
Solution Approach 2:
The patent changes the timing parameter reference from fixed subframe boundaries to a dynamic reference time point based on spectrum seizure moments. By adjusting the timing parameter calculation method to account for asynchronous spectrums while maintaining precise relative timing relationships, the system achieves both spectrum flexibility and synchronization accuracy
Data Source
AI summary
Embodiments of the present invention provide a data transmission method and a data transmission device. The data transmission device includes: a detection unit, configured to detect a first signal in a first cell; a determining unit, configured to determine a reference time point according to a first sequence of the detected first signal, where the reference time point is located in a first subframe of the first cell; where the determining unit is further configured to determine a position of a data channel according to the determined reference time point; and a receiving unit, configured to receive, according to the position of the data channel, control data and/or service data carried on the data channel. According to the embodiments of the present invention, resource utilization can be improved.