QoS-Flow Small Data Transmission for MT Downlink Signaling
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Solution Overview
Problem
Current communication protocols lack a solution for mobile terminated small data transmission (MT SDT), requiring terminal devices to enter a connected state for downlink data, which is not energy-efficient and leads to unnecessary signaling overheads.
Innovation Solution
A method and apparatus that support MT SDT by providing data size information at a granularity of quality of service (QoS) flows, enabling data transmission without entering a connected state, and utilizing signaling radio bearers (SRB2) for control signaling, while avoiding unnecessary data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device enters a connected state to receive downlink small data, then the data transmission can be completed, but the power consumption increases and signaling overheads are generated
Solution Approach 1:
The patent segments the data transmission process by identifying small data packets that can be transmitted without establishing a full RRC connected state. The network device determines the data size and selectively applies SDT for downlink data, separating the transmission path into SDT and full connection paths based on data characteristics
Solution Approach 2:
The network device performs preliminary assessment of the downlink data size before triggering RRC connection establishment. By evaluating data characteristics in advance and storing them in a buffer, the system determines whether SDT is sufficient, preventing unnecessary connection transitions and reducing power consumption
2Loss of information
If the terminal device enters a connected state for downlink data reception, then data transmission is enabled, but signaling overheads increase
Solution Approach 1:
The patent extracts the essential function of small data transmission from the complete RRC connection establishment process. By identifying and isolating small data packets, the system transmits them through SDT using existing inactive state resources, removing the need for full connection signaling and reducing overhead
Solution Approach 2:
The system dynamically adjusts the transmission mode based on real-time data characteristics. The network device continuously evaluates downlink data size and switches between SDT and full connection modes, optimizing signaling usage while maintaining transmission reliability
Data Source
AI summary
Embodiments of this application provide a small data transmission method and a communication apparatus. In the method, an access management network element may provide a data size for an access network device at a granularity of a QoS flow, so that the access network device can determine to transmit data of the QoS flow in an SDT manner.