Javier Velázquez Martínez
Telefónica Innovación Digital CDO - R&D Engineer
Javier Velázquez Martínez has played a key technical role in the design, development, and integration of the Network Slice Controller (NSC) within the ETSI SDG TFS (TeraFlowSDN) ecosystem, while actively promoting its alignment with IETF network slicing standardisation efforts.
Javier’s contribution is innovative in its unified handling of 3GPP and IETF slicing models, its technology-agnostic realisation framework, and its integration of sustainability metrics, such as energy consumption and efficiency into slice planning decisions.
Transport network slicing across multi-vendor, multi-domain, and multi-technology environments remains a significant challenge for network operators. Key difficulties include translating high-level service requirements into technology-specific configurations, ensuring end-to-end lifecycle management with strict SLO/SLE guarantees, achieving interoperability between 3GPP and IETF slicing models, and allocating network resources efficiently and sustainably. Addressing these challenges is essential to move network slicing from concept to large-scale operational reality.
The Network Slice Controller (NSC) directly addresses these challenges by providing a standardised control component that orchestrates the request, realisation, and lifecycle management of IETF network slices across heterogeneous infrastructures.
Javier’s contribution enables the practical realisation of the IETF-defined NSC architecture within ETSI TeraFlowSDN, bridging the gap between standards and deployable, open-source implementations.
The implemented controller exposes technology-agnostic slice service APIs aligned with IETF data models and translates abstract slice intents into concrete realisation actions across multiple network controllers and underlay technologies. It supports the full slice lifecycle, including creation, modification, deletion, monitoring, and optimisation, while enabling interoperability with both IETF slice service requests and 3GPP NRM-based requests. Deployment over SDN infrastructures such as TeraFlowSDN and network emulation platforms demonstrates its readiness for real operational environments. Subsequent releases further extended its capabilities with energy-aware slice planning, directly supporting ETSI’s green networking and sustainability objectives.
Additional impact of Javier’s contribution includes the initiation and coordination of the NSC Module Development Group, strengthening alignment between standardisation and open source communities.
Javier’s contribution is innovative in its unified handling of 3GPP and IETF slicing models, its technology-agnostic realisation framework, and its integration of sustainability metrics, such as energy consumption and efficiency into slice planning decisions. Its open, modular design enables integration with cloud-native SDN platforms, extensible APIs, and pluggable planners.
The NSC significantly improves interoperability, operational efficiency, and sustainability, while paving the way for secure, programmable, and standard-aligned transport network slicing across ETSI ecosystems.
Overall, Javier’s contribution significantly advanced the practical standardisation, implementation maturity, and sustainability of transport network slicing within ETSI ecosystems.
