Asynchronous Data Transmission for IoT Random Access Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of the Internet of Things (IoT), face inefficiencies in supporting long duty cycles and sporadic small data packet transmissions from a large number of devices, leading to excessive overhead in random access procedures and low data transmission efficiency.
Innovation Solution
A data transmission method that involves obtaining configuration information for random access preambles and payload data resources, using modulation schemes supporting asynchronous transmission, and employing filter-based or filter bank-based modulation to reduce interference and improve spectral efficiency, allowing for orthogonal or quasi-orthogonal demodulation reference signals and dynamic selection of data transfer modes based on data type and requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional random access procedures are used for IoT devices with long duty cycles and sporadic small data packets, then devices can establish connection, but excessive overhead is generated and data transmission efficiency is reduced
Solution Approach 1:
The patent segments the random access procedure into two independent parts: a random access preamble for connection establishment and payload data for actual data transmission. This segmentation allows devices to use lightweight preambles for initial access without being forced through lengthy traditional random access procedures for every small data packet, thereby reducing overhead and improving transmission efficiency for IoT scenarios with long duty cycles
Solution Approach 2:
The patent introduces preliminary action by establishing a connection state through the random access preamble before actual data transmission occurs. Once connected, devices can transmit payload data more efficiently without repeating the full random access procedure for each small packet, addressing the overhead issue for devices with long duty cycles that maintain connection for extended periods
2Reliability
If synchronous transmission is used to avoid multi-user interference, then interference is reduced, but uplink synchronization complexity increases and transmission flexibility is limited
Solution Approach 1:
The patent applies dynamics by transitioning from rigid synchronous transmission requirements to flexible asynchronous transmission. The system dynamically adapts to different device states and transmission conditions, allowing devices to transmit at different times without strict synchronization while still managing interference through the separated preamble-data structure and base station coordination, thus reducing synchronization complexity
Solution Approach 2:
The patent introduces an intermediary approach by using the random access preamble as a mediator between devices and the base station. The preamble establishes a controlled connection state that enables the base station to manage subsequent payload data transmission, reducing the need for complex uplink synchronization while maintaining interference avoidance through structured access control
3Productivity
If filter-based or filter bank-based modulation is used to reduce interference, then spectral efficiency improves, but implementation complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing filter-based or filter bank-based modulation parameters into the transmission system. These parameters (such as filter coefficients, bank configuration, and processing delays) are adjusted to optimize spectral efficiency and reduce interference between devices, particularly beneficial for dense IoT deployments where spectral resources are constrained
Solution Approach 2:
The patent incorporates periodic action through the structured transmission sequence where preambles are transmitted periodically at designated time-frequency resources, followed by payload data transmission. This periodic structure enables the filter-based modulation to operate in a controlled manner, improving spectral efficiency through regular pattern recognition at the receiver while managing implementation complexity through standardized timing and resource allocation
Data Source
AI summary
A data transmission method is provided. The method includes obtaining configuration information, wherein the configuration information indicates transmission resources of a random access preamble and payload data corresponding to the random access preamble, transmitting the random access preamble and the payload data at the transmission resources, modulating the payload data using a modulation scheme supporting asynchronous transmission, and receiving feedback information, wherein the feedback information comprises an indication which indicates whether the payload data is successfully received. Various examples of the present disclosure also describe a method for receiving data with space multiplexing which is applied to a base station side, and further describe a terminal and a base station. Employing the examples of the present disclosure, transmission efficiency of long duty cycle and sporadic small data packets of a large number of devices in the Internet of Things in future communication systems can be improved.