In a significant move that signals the accelerating evolution of Japan's telecommunications infrastructure, SoftBank Corp. has announced a landmark agreement with Swedish technology giant Ericsson to expand and modernise its core network capabilities. This strategic partnership, unveiled in Stockholm on 26th March 2026, positions SoftBank at the forefront of 5G Standalone (SA) technology deployment whilst simultaneously establishing a foundation for next-generation services that could reshape the Japanese telecom landscape.

The agreement represents more than a simple technology upgrade—it's a comprehensive transformation that will integrate Ericsson's most advanced cloud-native dual-mode 5G Core solution alongside Ericsson Cloud IMS (IP Multimedia Subsystem). For SoftBank, one of Japan's leading mobile network operators, this partnership promises to deliver enhanced network performance, improved operational efficiency, and the ability to rapidly deploy innovative services that meet the evolving demands of both consumer and enterprise customers.

The Technical Foundation: Cloud-Native Architecture

At the heart of this partnership lies Ericsson's cloud-native dual-mode 5G Core solution, a sophisticated platform designed to support both legacy 4G services and advanced 5G capabilities simultaneously. This dual-mode functionality proves crucial for operators like SoftBank, who must maintain seamless service continuity for existing customers whilst progressively rolling out cutting-edge 5G features across their network footprint.

The cloud-native architecture represents a fundamental shift from traditional, hardware-dependent network infrastructure to flexible, software-defined systems that can scale dynamically based on demand. This approach allows SoftBank to deploy network functions as containerised applications, enabling unprecedented agility in service deployment and resource allocation. Rather than investing in fixed hardware that quickly becomes obsolete, the operator can continuously update and enhance network capabilities through software upgrades.

Complementing the 5G Core solution, Ericsson Cloud IMS brings advanced voice, video, and messaging capabilities that are essential for delivering rich communication experiences. The IMS framework ensures that traditional telephony services transition smoothly into the 5G era whilst enabling innovative services such as ultra-high-definition video calling, augmented reality communication, and seamless integration with enterprise collaboration platforms.

Automation and Efficiency: Transforming Network Operations

Perhaps the most compelling aspect of this agreement is the integration of cutting-edge automation technologies designed to fundamentally transform how SoftBank manages and operates its network infrastructure. Modern telecommunications networks have grown exponentially in complexity, with thousands of interconnected elements requiring continuous monitoring, optimisation, and troubleshooting. Manual management of such systems is not only inefficient but increasingly impossible at scale.

Ericsson's automation solutions employ advanced algorithms and machine learning capabilities to streamline network operations, enabling real-time resource optimisation that would be impossible through human intervention alone. These systems can predict traffic patterns, automatically adjust network capacity, identify potential issues before they impact customers, and orchestrate complex configuration changes across multiple network domains simultaneously.

The business implications of this automation are substantial. SoftBank anticipates significant reductions in both operational expenditure (OPEX) and capital expenditure (CAPEX)—a dual benefit that strengthens the operator's competitive position in Japan's intensely competitive telecommunications market. Operational savings emerge from reduced manual intervention, faster problem resolution, and more efficient use of network resources. Capital expenditure reductions come from the ability to maximise utilisation of existing infrastructure and deploy new capacity more precisely where and when it's needed.

The 5G Standalone Advantage

Central to this partnership is the accelerated transition to 5G Standalone (SA) architecture, which represents the full realisation of 5G's transformative potential. Many early 5G deployments worldwide utilised Non-Standalone (NSA) architecture, which relies on existing 4G core networks to deliver 5G radio access. Whilst this approach enabled faster initial deployment, it fundamentally limits the advanced capabilities that distinguish 5G from its predecessors.

5G Standalone architecture, by contrast, implements an end-to-end 5G system with a dedicated 5G core network. This unlocks critical capabilities that simply cannot be delivered through NSA implementations:

• Ultra-low latency: SA networks can achieve latency below 10 milliseconds, essential for applications like autonomous vehicles, remote surgery, and industrial automation
• Network slicing: The ability to create virtualised, independent networks tailored to specific use cases, from massive IoT deployments to mission-critical communications
• Enhanced mobile broadband: Significantly improved data speeds and capacity, particularly in densely populated urban environments
• Edge computing integration: Seamless connection between network infrastructure and edge computing resources, enabling real-time processing for latency-sensitive applications
• Advanced quality of service: Sophisticated traffic management that ensures optimal performance for diverse application requirements

For SoftBank, the transition to 5G SA opens opportunities to develop entirely new revenue streams beyond traditional connectivity services. The operator can offer customised network solutions to enterprise clients, support emerging technologies like extended reality and digital twins, and position itself as an enabler of Japan's broader digital transformation initiatives.

Creating New Value in Japan's Telecom Ecosystem

The strengthened cloud-native platform resulting from this partnership is explicitly designed to help SoftBank create new value within its telecommunications business—a strategic imperative as traditional voice and data services face margin pressure from intense competition and changing consumer behaviours. The enhanced infrastructure provides the technical foundation for innovation across multiple dimensions.

Enterprise services represent a particularly promising opportunity. With network slicing capabilities enabled by 5G SA, SoftBank can offer bespoke connectivity solutions tailored to specific industry requirements. A manufacturing facility might receive a dedicated network slice optimised for massive numbers of IoT sensors and real-time control systems. A hospital network could obtain guaranteed ultra-low latency for telemedicine applications. A smart city implementation might leverage network slicing to support diverse use cases from traffic management to emergency services within a unified infrastructure.

The integration of edge computing capabilities creates additional possibilities. By processing data closer to where it's generated rather than in distant data centres, SoftBank can support latency-sensitive applications whilst reducing backhaul traffic and associated costs. This infrastructure becomes essential for emerging use cases like augmented reality navigation, autonomous vehicles, and industrial robotics that require split-second responsiveness.

Why This Matters

This partnership between SoftBank and Ericsson extends well beyond the immediate technical improvements to network infrastructure. It represents a microcosm of the broader transformation occurring across the global telecommunications industry as operators transition from providing basic connectivity to becoming enablers of comprehensive digital transformation.

For Japan specifically, this development is particularly significant. The country has long been recognised as a technology leader, yet faces demographic challenges including an ageing population and labour shortages that make productivity improvements through digital technology increasingly critical. Advanced 5G infrastructure provides the foundation for automation, remote work, telemedicine, and smart city initiatives that address these societal challenges.

From a competitive perspective, this move by SoftBank establishes a benchmark that will likely influence strategic decisions by other Japanese operators. The telecommunications sector is characterised by intense rivalry, and allowing competitors to gain substantial technical advantages risks long-term market share erosion. Expect rival operators to announce similar partnerships and infrastructure investments in response.

Globally, agreements like this demonstrate the continued relevance of established infrastructure vendors like Ericsson even as newer competitors emerge. The complexity of modern telecommunications networks, the criticality of reliability and security, and the depth of integration required favour vendors with extensive experience and proven track records. For Ericsson, winning major contracts with tier-one operators like SoftBank validates its technology strategy and strengthens its competitive position worldwide.

The integration of cloud-native architecture with advanced automation represents not merely an incremental improvement but a fundamental reimagining of how telecommunications networks are designed, deployed, and operated in the 5G era.

As this partnership moves from announcement to implementation over the coming months and years, the telecommunications industry will be watching closely. Success would provide a roadmap for other operators undertaking similar transformations. The real-world performance, operational benefits, and innovative services enabled by this infrastructure will help determine the business case for aggressive 5G SA investment globally. For consumers and businesses in Japan, the ultimate measure of success will be the tangible improvements in connectivity, the emergence of innovative services, and the broader contribution to Japan's digital economy. The foundation is now being laid—the coming years will reveal what is built upon it.