Ericsson and DT demonstrate low-latency 5G functionality


L4S is an advanced feature that will improve the quality of experience for latency sensitive or time critical use cases such as cloud gaming and augmented reality / virtual reality (AR / VR) applications. To illustrate the benefits of L4S, Ericsson and DT recorded an interactive cloud-based boat racing game with and without this technology. Played over a cellular network, the demo showed the contrast of the gaming experience between an L4S compatible 5G connectivity and one excluding this low latency managed feature.

The results clearly showed noticeable jitter spikes in gaming without L4S, while the one enabled by this 5G feature experienced smooth navigation throughout.

Alex Choi, SVP Technology Strategy & Innovation, Deutsche Telekom, says: “Consistent low latency in cellular networks is essential for creating exciting new user experiences. In collaboration with Ericsson, we have demonstrated the unique benefits of managed latency with L4S technology for urgent and high-speed applications over 5G. We will continue to work together to advance the adoption of L4S for consistent and scalable delivery of high-quality 5G and edge services to developers and customers. “

Per Narvinger, Head of Product Area Networks, Ericsson, said: “Our latest milestone with Deutsche Telekom shows how L4S can dramatically improve the performance of high-speed, time-critical applications in 5G networks. Constant low latency is a key element for many new 5G services and a necessity to elevate performance beyond 4G. This L4S feature will help bring existing 5G use cases to a new level and enable new applications that communication service providers can offer to consumers and businesses. “

Technical Info

L4S is a new technology based on a standardization of the Internet Engineering Task Force (IETF), which offers high throughput and low latency for IP traffic, resulting in improved and rapid management of rate adaptation and reduced network congestion, queues and packet loss.

L4S relies on ECN (Explicit Congestion Notification) in the IP header to indicate queue accumulation in the application radio access network. The congestion signals are then managed on the sender and receiver side using scalable congestion control algorithms. In turn, the technology signals the application server to adjust the application bit rate to meet the capacity of the established communication link. As a result, L4S is effective in delivering a seamless user experience, even with varying traffic load and radio conditions.


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