MT-SDT Triggering in Multi-gNB RAN via Paging Indication
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Solution Overview
Problem
Current techniques for mobile terminated small data transmission (MT-SDT) are incomplete, particularly in multiple-gNB scenarios, where it is unclear which gNB should trigger MT-SDT and which radio bearers support this functionality.
Innovation Solution
The proposed solution involves a method where a network device determines whether MT-SDT is performed for a terminal device by analyzing information such as radio bearer configurations, downlink data size, and terminal device capabilities. This determination is then used to trigger MT-SDT and configure appropriate radio bearers, allowing for efficient data transmission without transitioning to a connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device resumes connection to transmit small data, then data transmission capability is improved, but power consumption and signaling overhead increase
Solution Approach 1:
The patent segments data transmission into two categories: small data transmission handled via SDT in inactive state, and large data transmission requiring connected state. This segmentation allows the system to use the most efficient transmission mode for each data size category, avoiding unnecessary connection resumption for small data and thus reducing power consumption.
Solution Approach 2:
The patent introduces dynamic state management where the terminal device can flexibly transition between inactive and connected states based on real-time data characteristics. The network device dynamically determines whether to trigger MT-SDT based on downlink data size and terminal capabilities, enabling adaptive state management that optimizes power consumption while maintaining transmission capability.
2Productivity
If the terminal device resumes connection for data transmission, then data transmission capability is improved, but signaling overhead increases
Solution Approach 1:
The patent segments data transmission handling into two paths: MT-SDT for small downlink data without connection resumption, and traditional connection resumption for large data. This segmentation reduces signaling overhead by avoiding unnecessary connection establishment and resumption procedures for small data transmission.
Solution Approach 2:
The patent enables the terminal device to autonomously determine when MT-SDT is applicable based on received downlink data characteristics and network instructions, without requiring full connection resumption. The terminal device self-manages the SDT process by monitoring downlink data arrival and utilizing configured radio bearers, reducing signaling overhead while maintaining transmission capability.
3Productivity
If MT-SDT is implemented in multiple-gNB scenarios, then communication efficiency is improved, but system complexity increases
Solution Approach 1:
The patent makes the MT-SDT mechanism universal across multiple gNB scenarios by defining clear determination criteria that apply regardless of which gNB is serving the terminal. The network device uses consistent evaluation rules (downlink data size threshold, terminal capability indication, radio bearer configuration) that work uniformly in single-gNB and multi-gNB scenarios, simplifying implementation while improving communication efficiency.
Solution Approach 2:
The patent introduces feedback mechanisms where the network device determines MT-SDT applicability based on feedback information about downlink data characteristics and terminal capabilities. The first paging message includes indication information that provides feedback to the terminal device about SDT eligibility, enabling efficient multi-gNB operation through standardized feedback protocols.
4Productivity
If radio bearer configuration is added for MT-SDT, then data transmission capability is improved, but configuration complexity increases
Solution Approach 1:
The patent applies preliminary action by configuring radio bearers in advance during RRC setup or reconfiguration procedures. The network device pre-configures the terminal device with appropriate radio bearers that support MT-SDT, so when downlink data arrives and MT-SDT is triggered, the terminal can immediately use the pre-configured bearers without requiring real-time configuration changes, simplifying the overall configuration process.
Solution Approach 2:
The patent manages configuration complexity by dynamically adjusting radio bearer parameters based on data characteristics. Instead of requiring complex reconfiguration for each MT-SDT instance, the system changes key parameters (such as activating pre-configured bearers with specific QoS characteristics) to adapt to different data transmission scenarios, maintaining simplicity while improving transmission capability.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A first network device receives a first paging message from a second network device in a RAN, the first paging message comprising information on a MT-SDT for a terminal device, and determines, based on the information, whether the MT-SDT is performed for the terminal device. If the MT-SDT is performed for the terminal device, the first network device transmits, to the terminal device, a second paging message comprising an indication indicating that the MT-SDT is performed for the terminal device. In this way, the MT-SDT procedure can be triggered.