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Samsung patents method to fix 5G IoT device connection drops

This patent describes a way for 5G Internet of Things devices to recover when their radio connection fails during data transmission. It outlines specific steps for the device to switch to an idle state and resend data using a simplified control channel if the standard connection cannot be resumed.

Why it mattersThis improves the reliability of low-power 5G sensors and trackers by ensuring they can recover from connection errors without needing a full reboot.

In the filing’s own words

There is disclosed a first method for a UE, wherein the UE is in 5GMM-CONNECTED mode with RRC inactive indication. The first method comprises: establishing a PDU session for sending data over the control plane; determining that there is data to be sent in an UL NAS TRANSPORT message; in response to the determining, requesting lower layers to resume an RRC connection; and upon receiving a fallback indication from the lower layers in response to the requesting, entering 5GMM-IDLE mode. Also disclosed is a second method for a UE, wherein the UE is in 5GMM-CONNECTED mode with RRC inactive indication. The second method comprises: establishing a PDU session for sending data over the user plane; determining that there is user data to be sent over the user plane; determining that there is no pending NAS procedure; and upon receiving a fallback indication from the lower layers, in response to the determining, entering 5GMM-IDLE mode. Also disclosed is a third method for a UE, wherein the UE is in 5GMM-CONNECTED mode with RRC inactive indication. The third method comprises: in response to receiving, from lower layer, a suspend indication, determining the type of the suspend indication; and entering a NAS mode according to the determined type of the suspend indication.

What exactly they claim (claim 1)

1. A method for a user equipment (UE), the method comprising: identifying that the UE is in 5th generation mobility management (5GMM)-CONNECTED mode with radio resource control (RRC) inactive indication; in case that the UE initiates a network access stratum (NAS) transport procedure, requesting lower layers to transition to an RRC connection state; and in response to receiving a fallback indication from the lower layers based on the requesting, entering 5GMM-IDLE mode and, in case that the UE is using control plane cellular Internet of things (CIoT) 5th generation system (5GS) optimization, transmitting a control plane service request (CPSR) message including data, wherein the data comprises at least one of a short message service (SMS), a location serviced message, or CIoT user data.

Facts

Company
Samsung (Samsung Electronics Co., Ltd.)
Official title
Method and apparatus for recovery from fallback for cellular internet of things device
Patent number
US12764821B2
Application number
17796472
Filed
Jan 29, 2021
Granted
Oct 13, 2026
Inventors
1
Claims
12

Classified under

H04W 76/27 Electricity & electronicsH04W 4/70 Electricity & electronicsH04W 76/11 Electricity & electronicsH04W 76/12 Electricity & electronics
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.