Small Data Transmission Rejection for Congested 5G NR Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G NR systems, frequent small data transmissions lead to excessive signaling resource occupation due to frequent RRC state switching, resulting in resource wastage.
Innovation Solution
A data transmission method that allows a serving access network device to reject or terminate Small Data Transmission (SDT) when resource congestion occurs, providing redirection or cell reselection parameters to the terminal device, thereby improving data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE frequently switches from RRC inactive state to RRC connected state for small data transmission, then data transmission capability is maintained, but signaling resources are excessively occupied
Solution Approach 1:
The patent extracts the data transmission function from the complete RRC connected state and allows it to operate independently in the RRC inactive state through SDT. This separation enables small data packets to be transmitted without requiring full RRC state switching, thereby reducing signaling resource occupation while maintaining data transmission capability.
2Ease of operation
If the serving access network device continues to allocate resources for congested SDT, then resource allocation simplicity is maintained, but data transmission delay increases
Solution Approach 1:
The patent implements preliminary congestion detection and SDT termination mechanisms in the serving access network device. When congestion is detected, the device proactively terminates SDT and redirects the UE to an anchor access network device before actual data transmission occurs. This preliminary action prevents resource allocation waste and reduces transmission delay by avoiding failed transmission attempts.
3Productivity
If the SDT is terminated or rejected by the serving access network device, then data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces the anchor access network device as an intermediary to handle SDT when the serving access network device is congested. The serving device can quickly terminate SDT and redirect to the anchor device without complex local resource management decisions. This intermediary approach improves transmission efficiency while keeping the serving device's control logic relatively simple.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This application provides a data transmission method, an apparatus, and a system, which are applied to the field of communication technologies. The data transmission method includes: receiving, by a serving access network device, a first radio resource control RRC message from a terminal device, where the first RRC message is used to establish small data transmission SDT; and if the serving access network device does not meet a requirement of the SDT, sending a second RRC message or a third RRC message to the terminal device, where the second RRC message may be used to indicate the terminal device to terminate the SDT, and the third RRC message may be used to indicate the serving access network device to reject performing the SDT. Based on this solution, once the serving access network device does not meet the requirement of the SDT, the SDT may be rejected or terminated, so that the terminal device can subsequently reselect a cell to initiate the SDT again. Compared with a solution in which a terminal continues to wait in a current cell, data transmission efficiency of the terminal device can be improved.