T-Mobile announced it has deployed Low Latency, Low Loss, Scalable Throughput (L4S) across a wireless environment at scale.

In what it claimed to be a first for a U.S. carrier, the telecom giant unlocked L4S as part of a nationwide rollout of 5G Advanced, its 5G Standalone (5G SA) architecture as unveiled in April of this year.

T-Mobile touts L4S’s low latency and ability to deliver minimal packet loss and real-time responsiveness, including under heavy network traffic. The telecom operator translates this into yields for cloud gaming, video calling, and Extended Reality (XR), alongside a remote driving case study.

The announcement also mentions L4S’s impact on the app level, mentioning partners such as Apple, which has included L4S support in its operating systems since 2023.

L4S and network slicing

While Ericsson and Emirati telecom operator e& have previously deployed L4S in parts of the Middle East and Africa, the T-Mobile deployment is notable for its scale. While T-Mobile did not disclose the exact number of US locations benefiting from L4S, the coverage is described as nationwide.

Meanwhile, L4S's programmable nature comes as part of T-Mobile’s programmable 5G network, 5G Advanced.

5G-Advanced has been deemed critical for operators to support revenue-generating services such as network slicing, and can take advantage of AI-driven network technology like artificial intelligence radio access network (AI-RAN).

Both T-Mobile and Ericsson are banking on the potential of wireless 5G over legacy 4G and LTE cores from rivals, with the key appeal being network slicing.

Viewed as one of the key architectural features of a 5G SA deployment, network slicing allows an operator to set up siloed virtual networks that act as independent, scalable networks, able to support resource-heavy examples such as sports broadcasting and public safety services. With increased data, network slicing can handle the extra traffic, where it can be complemented by L4S's more targeted congestion control technology.

ABI Research forecasted network slicing to become a $19.5 billion market by 2028 - but current technical and use case issues have slowed down the market in recent years, with 2018 seeing ABI originally proclaim it as a $66 billion market opportunity by 2026.