Uplink Transmission in Unlicensed Spectrum via Indication Parameters
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Solution Overview
Problem
In LTE systems, uplink data transmission in unlicensed spectra faces challenges due to uncertainty in channel occupancy, leading to resource waste as terminals must monitor channel idle states before transmitting, and base stations need to send multiple scheduling instructions, resulting in inefficiencies.
Innovation Solution
The method involves determining a target indication parameter to select a suitable transmission mode for uplink data transmission in unlicensed spectra, where the terminal or base station uses predefined or signaled parameters to choose an optimal modulation and coding scheme, and adjusts transmission timing and packet length to minimize resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal monitors channel idle states before transmitting uplink data in unlicensed spectra, then the transmission reliability is improved, but the transmission time is increased due to unnecessary channel monitoring
Solution Approach 1:
The base station performs preliminary channel assessment and sends indication information to the terminal in advance, telling the terminal whether the channel is suitable for uplink transmission. This eliminates the need for the terminal to perform redundant channel monitoring, reducing transmission time while maintaining reliability.
Solution Approach 2:
The base station acts as an intermediary between the channel and the terminal. Instead of the terminal directly monitoring the channel, the base station assesses the channel condition and communicates its decision to the terminal through indication information, thereby streamlining the transmission process.
2Reliability
If the base station sends multiple scheduling instructions to the terminal, then the transmission reliability is improved, but the signaling overhead is increased resulting in resource waste
Solution Approach 1:
The patent extracts the essential scheduling information into a single indication message sent by the base station. Instead of sending multiple scheduling instructions, the base station sends one consolidated indication that contains all necessary information for the terminal to proceed with uplink transmission, reducing signaling overhead and resource waste.
Solution Approach 2:
Multiple scheduling instructions are merged into a single indication information message. The base station combines channel assessment results, transmission permissions, and other scheduling decisions into one unified signal, reducing the number of separate messages and minimizing resource consumption.
3Adaptability or versatility
If the terminal adopts multiple transmission modes in unlicensed spectra, then the adaptability is improved, but the device complexity is increased
Solution Approach 1:
The terminal dynamically switches between different transmission modes based on the indication information received from the base station. The first transmission mode is used when the channel is suitable for uplink, and the second transmission mode is used when it is not. This dynamic adaptation allows the terminal to handle different channel conditions effectively without permanently increasing complexity.
Solution Approach 2:
The terminal changes its transmission parameters (such as whether to perform channel monitoring, timing advance values, etc.) based on the indication information from the base station. By adjusting these parameters dynamically, the terminal achieves adaptability to different channel conditions while keeping the underlying device structure relatively simple.
Data Source
AI summary
An uplink transmission method and an apparatus thereof are provided. The method includes that a terminal in an unlicensed spectrum determines a target indication parameter, where the target indication parameter is used for indicating a target transmission mode adopted when a terminal transmits uplink data. The method further includes that the terminal determines the target transmission mode according to the target indication parameter and transmits the uplink data to a base station in the unlicensed spectrum on the basis of the target transmission mode.