Unlicensed Uplink Scheduling for Variable IoT Data Loads
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Solution Overview
Problem
Existing uplink grant-free scheduling methods in IoT devices face inefficiencies due to inflexible resource configurations that lead to data transmission delays and resource wastage when handling variable data sizes, particularly in scenarios with limited wireless coverage and power constraints.
Innovation Solution
A method where terminals inform the base station of remaining data to be transmitted, allowing dynamic resource allocation through pre-configured and additional scheduling information, enabling efficient transmission without excessive delays or resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If pre-configured grant-free transmission resources are used, then signaling overhead is reduced and power consumption is saved, but data transmission reliability deteriorates when data size varies
Solution Approach 1:
The patent implements dynamic resource allocation by allowing terminals to request additional grant-free resources when initial resources are insufficient. The base station dynamically adjusts resource allocation based on actual data transmission needs, transforming the static pre-configured resource model into a dynamic adaptive model that maintains reliability while preserving energy efficiency.
Solution Approach 2:
The patent changes the resource allocation parameter from fixed to variable by introducing a resource request mechanism. When data size exceeds pre-configured resources, the terminal requests additional resources, and the base station adjusts the resource parameters accordingly, enabling the system to adapt to varying data sizes while maintaining grant-free efficiency.
2Device complexity
If fixed grant-free transmission resources are allocated, then resource allocation complexity is reduced, but data transmission efficiency deteriorates for variable data sizes
Solution Approach 1:
The patent segments the resource allocation process into two stages: initial pre-configured resource allocation and subsequent dynamic resource supplementation. This segmentation allows the system to maintain simple initial configuration while enabling efficient handling of variable data sizes through optional additional resource allocation, resolving the contradiction between complexity and efficiency.
Solution Approach 2:
The patent creates a universal resource allocation framework that can handle both small and large data transmissions efficiently. The same grant-free mechanism serves dual purposes: maintaining simplicity for small data while providing scalability for large data through resource requests, making the system universally applicable to varying data sizes without sacrificing efficiency.
3Productivity
If pre-configured uplink resources are used without additional allocation, then system spectrum utilization is improved, but transmission delays increase when data cannot be sent completely
Solution Approach 1:
The patent applies preliminary action by pre-configuring initial grant-free resources for efficient spectrum utilization, while also preparing a resource request mechanism in advance. When data transmission requires more resources than initially configured, the terminal can immediately request additional resources without waiting for scheduled allocations, preventing delays while maintaining overall spectrum efficiency.
Data Source
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AI summary
The present invention relates to the technical field of wireless communications, and provides a data transmission method based on unlicensed uplink scheduling. The method comprises: transmitting first uplink data to a base station according to first uplink scheduling information, and transmitting to the base station first data indication information to be transmitted to indicate whether data to be transmitted exists in a terminal after transmitting the first uplink data; when data to be transmitted exists in the terminal, transmitting second uplink data to the base station on a target resource reserved by the base station according to second uplink scheduling information. When the amount of data is large, the terminal can perform uplink transmission on remaining data without waiting for the coming of the next transmission period corresponding to the first uplink scheduling information, thereby avoiding excessive data delay and improving data transmission performance; and only when the amount of data is large, the base station reserves additional resources for the terminal, and does not need to specially reserve the transmission resource corresponding to the second uplink scheduling information, so as to avoid waste of transmission resources when the amount of data is small.