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Samsung patents faster 5G network switching without handshake

This filing describes a method for mobile devices to switch between 5G network cells without performing a standard random access channel (RACH) handshake. The device checks specific conditions, such as timing alignment and pre-configured grants, to execute the switch immediately using stored data.

Why it mattersThis improves the efficiency of 5G connections by reducing the delay and signaling overhead required when a phone moves between network cells.

In the filing’s own words

A method of operating a user equipment is provided that includes determining a first determination that a CLTM cell switch is triggered by an event. The method also includes, in response to the first determination, determining a second determination whether (i) the event is triggered by L1 measurements of a CLTM target cell, (ii) two timing advance groups are not configured for the CLTM target cell, (iii) a CG Type 1 configuration for a RACH-less cell switch procedure is configured for the CLTM target cell, and (iv) an ltm-Candidate-TimeAlignmentTimer is running in a first available CG occasion corresponding to an SSB or an SSB quasi-colocated with a selected channel state information-reference signal. The method further includes, in response to the second determination being affirmative, (i) processing a stored timing advance command associated with the ltm-Candidate-TimeAlignmentTimer, and (ii) considering RACH-less conditional LTM cell switch to be ongoing.

What exactly they claim (claim 1)

1. A method of operating a user equipment (UE), the method comprising: determining a first determination that a conditional layer 1 (L1)/layer 2(L2) triggered mobility (CLTM) cell switch is triggered by an event; in response to the first determination, determining a second determination whether: the event is triggered by L1 measurements of a CLTM target cell; two timing advance groups (TAGs) are not configured for the CLTM target cell; a configured grant (CG) Type 1 configuration for a random access channel (RACH)-less cell switch procedure is configured for the CLTM target cell; and an LTM candidate time alignment timer for the CLTM target cell (ltm-Candidate-TimeAlignmentTimer) is running in a first available CG occasion corresponding to a selected synchronization signal block (SSB) or an SSB quasi-colocated (QCLed) with a selected channel state information (CSI)-reference signal (RS); and in response to the second determination being affirmative: processing a stored timing advance (TA) command associated with the ltm-Candidate-TimeAlignmentTimer; and considering RACH-less conditional LTM cell switch to be ongoing.

Facts

Company
Samsung (Samsung Electronics Co., Ltd.)
Official title
TRIGGERING RACHLESS NETWORK INITIATED LTM
Publication number
US20260270814A1
Application number
19537163
Filed
Feb 11, 2026
Published
Sep 10, 2026
Inventors
2
Claims
20

Classified under

H04W 36/00725 Electricity & electronicsH04W 36/08 Electricity & electronicsH04W 36/304 Electricity & electronicsH04W 56/0045 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.