Uplink Grant-Free Transmission Alert Sequence Collision Avoidance
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Solution Overview
Problem
In new generation wireless communication systems, the coexistence of URLLC and eMBB traffic types leads to interference during resource multiplexing, affecting demodulation performance and service quality due to differing requirements and characteristics.
Innovation Solution
A method where a terminal transmits a target alert sequence to a network access device using a first uplink grant-free transmission resource, and upon receiving a collision indication, it switches to a different transmission resource to avoid collisions and interference, ensuring reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If uplink grant-free transmission mode is used to reduce latency for URLLC traffic, then transmission latency is reduced, but transmission interference increases when multiple users transmit simultaneously
Solution Approach 1:
The terminal performs preliminary action by transmitting an alert sequence before the actual data transmission. This alert sequence reserves the uplink resource in advance and notifies the network access device of the terminal's transmission intent, allowing the network to proactively allocate resources and avoid collisions before they occur.
Solution Approach 2:
The network access device provides feedback by transmitting a collision indication message back to the terminal after receiving the alert sequence. This feedback mechanism allows the terminal to learn whether the requested resource is already occupied and adjust its transmission strategy accordingly, enabling dynamic resource allocation and interference avoidance.
2Productivity
If multiple traffic types are multiplexed on the same resource, then resource utilization is improved, but demodulation performance deteriorates due to interference
Solution Approach 1:
The system introduces dynamic resource allocation through the alert sequence and collision indication mechanism. Instead of static resource assignment, the terminal can dynamically switch between different uplink resources based on real-time resource occupancy information received from the network access device, enabling flexible adaptation to varying traffic conditions.
Solution Approach 2:
The uplink transmission process is segmented into distinct phases: alert sequence transmission, resource occupancy determination, and data transmission. This segmentation allows the system to manage different traffic types in a structured manner, with each phase serving a specific function in coordinating resource usage and avoiding interference.
Data Source
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AI summary
The present disclosure is related to a method and an apparatus for data transmission. The method includes transmitting a target alert sequence to a network access device by using a first uplink grant-free transmission resource corresponding to the target alert sequence; wherein the target alert sequence is configured to notify the network access device that the terminal requests to use the first uplink grant-free transmission resource to transmit uplink data; and transmitting the uplink data by using a transmission resource different from the first uplink grant-free transmission resource, when receiving a collision indication fed back by the network access device in response to the target alert sequence. According to the technical solution, before transmitting the uplink data, the terminal transmits the alert sequence to the network access device by using the first uplink grant-free transmission resource corresponding to the target alert sequence; thereby, the problem of collision during multiplexing transmission of multi-user resources can be avoided, transmission interference can be reduced, demodulation performance can be improved, and service quality can be ensured.