SDT Downlink Delivery Keeps NR Terminals Inactive
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Solution Overview
Problem
In a new radio (NR) system, terminal devices in RRC inactive states experience high power consumption and inefficient data transmission due to frequent state switching and network buffering, especially with extended discontinuous reception cycles.
Innovation Solution
Implementing a small data transmission (SDT) process where an access network device triggers core network devices to stop buffering downlink data, allowing direct data transmission to the terminal device without state switching, thereby reducing power consumption and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device uses extended DRX cycle to monitor paging messages, then power consumption is reduced, but data transmission efficiency deteriorates due to network buffering and frequent state switching
Solution Approach 1:
The patent extracts the downlink data from the network buffer and delivers it directly to the terminal device in the inactive state through the access network device, eliminating the need for state switching and paging procedures, thus resolving the contradiction between power saving and data transmission efficiency
Solution Approach 2:
The access network device acts as an intermediary between the core network device and the terminal device, receiving downlink data from the core network and forwarding it directly to the terminal in inactive state, enabling efficient data transmission without requiring the terminal to switch states
2Productivity
If the terminal device switches from inactive state to connected state for data transmission, then data transmission efficiency is improved, but power consumption increases due to frequent state switching and signaling exchange
Solution Approach 1:
The patent enables downlink data to be delivered directly to the terminal device while it remains in the inactive state, performing the data transmission action preliminarily before any state switching would occur, thus avoiding the energy cost of state transitions while maintaining transmission efficiency
Data Source
AI summary
This application provides a data transmission method and an apparatus. The method includes: When an access network device receives uplink information from a terminal device through SDT, the access network device sends a first message, where the first message is used to trigger a second core network device to stop buffering downlink data of the terminal device; and the access network device receives downlink data from the second core network device, and sends the downlink data to the terminal device through the SDT. In the foregoing process, when the terminal device triggers the SDT, the access network device may trigger the second core network device to stop or cancel buffering the downlink data of the terminal device, so that the second core network device can send the downlink data of the terminal device to the terminal device through the SDT.