Samsung Patents a Tiny Background Chip That Keeps Your Phone's Main Radio Off
Your phone's main radio burns battery just sitting there listening for messages. Samsung's new patent describes a much tinier, lower-power chip that does the listening instead, waking the main radio only when something real arrives.
How Samsung's low-power wake-up chip saves battery
Imagine your phone's radio as a security guard standing outside all night. It burns energy even when nothing happens. Now imagine replacing that guard with a cheap motion sensor that only buzzes the guard awake when someone actually shows up at the door.
That's the core idea here. Samsung's patent describes a tiny secondary radio called a low-power wake-up receiver (LP-WUR). When your phone is idle or in a low-activity mode, the main radio shuts off. The LP-WUR takes over and watches for a specific signal from the cell tower. When that signal arrives, it taps the main radio on the shoulder to wake up.
You'd never notice the switch happening. Your calls and messages would still arrive normally. But your battery would last longer because the power-hungry main radio spends more time off, rather than constantly listening to an empty channel.
receiving, from a base station by a low power-wake up receiver (LP-WUR), a wake up indication; delivering, from the LP-WUR to a main radio (MR), an indication to monitor a paging; and monitoring, by the MR, the paging.
Translation: The tiny backup chip catches a signal from the cell tower and tells the heavy duty main radio to wake up and check for messages.
How the LP-WUR hands off to the main radio
The patent covers a protocol for coordinating two radios inside a single phone: a full-power main radio (MR) that handles calls and data, and a much smaller low-power wake-up receiver (LP-WUR) that sips energy while the main radio sleeps.
Here's the sequence the patent describes:
- The phone's network (a 5G or 6G base station) sends configuration instructions telling the LP-WUR what kind of wake-up signal to listen for.
- While the phone is idle or inactive, the main radio switches off entirely.
- The LP-WUR keeps listening at very low power.
- When the base station broadcasts a Wake-Up Signal (WUS), the LP-WUR catches it and sends an internal instruction to the main radio.
- The main radio powers back on and checks for an incoming page (a page is the network's formal knock asking whether the device is reachable).
The key engineering detail is that the LP-WUR doesn't process the actual message. It only handles the lightweight trigger signal. All the heavy decoding work stays with the main radio, but that radio is now off for far longer stretches.
… when the UE ( 100 ) is in the idle state or inactive state and a MR ( 103 ) of the UE ( 100 ) is moved to an OFF state or a sleep state.
Translation: The phone stays completely powered down to save battery while the tiny backup receiver handles listening for you.
What this means for 5G phone battery life
Battery life is one of the most complained-about aspects of modern smartphones, and 5G is a meaningful part of the problem: its faster radios consume more power than older cellular generations. A dedicated wake-up receiver is a known hardware approach to that tradeoff, and Samsung's steady interest in low-power radio filings shows the company treating it as infrastructure-level work rather than a one-off idea.
For everyday users, the practical upside would be a phone that stays connected without burning through charge while sitting in your pocket. The benefit would be most visible for devices that spend long periods in light-use modes, like wearables, tablets, or phones left on standby.
This is the 71st Samsung filing we've tracked since May in our 5G and network push, joining earlier work like one using satellites to find phones and one keeping watch signals clear.
Claim 1 covers any phone that uses a low-power radio to listen for a wake-up signal while the main radio sleeps, then passes that signal along to wake the main radio up so it can receive an incoming page. The claim does not specify a frequency, a signal format, or a particular chip arrangement, which makes it very broad.
That breadth has real consequences. Any manufacturer shipping a phone that follows this basic sequence, power down the main radio, let a small radio keep watch, wake everything up when the network calls, could fall inside the claim's reach regardless of how differently the underlying hardware is built.
The claim's durability will depend on whether prior research and industry standards work has already described this handoff sequence. If examiners find that it has, the claim shrinks. If not, Samsung holds a strong position across a feature that is likely to appear in a wide range of future devices.
There are more where this came from
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The drawings
5 drawing sheets from US 2026/0270877 A1 · click any drawing to enlarge
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