Application Relocation in an Edge-Enabled 5G System: Use Cases, Architecture, and Challenges

With the growing development of 5G and its new services, edge computing is becoming the cornerstone of the ongoing network transformation. Its integration into 5G network infrastructure brings new research opportunities related to the design and implementation of high-performance systems, enabling the accomplishment of the three main promises of 5G: very high speed, low latency, and massive connectivity. This trend has generated strong interest in realizing effective life cycle management of latency-sensitive edge applications in order to achieve a high level of QoS while ensuring the service continuity in the case of user mobility. This article deals with the relocation of edge services, commonly called edge relocation, which aims to relocate edge application instances between edge clusters in order to ensure uninterrupted service. To achieve our objective, we propose a cloud-native edge-enabled 5G solution that complies with ETSI and 3GPP standards. The latter performs pre-relocation and relocation of edge applications in order to support the service continuity. Various scenarios of edge delocation are discussed, and illustrative use cases are provided. Next, a proof of concept is described to demonstrate how edge relocation can be implemented and leveraged to ensure service continuity in the case of infrastructure performance degradation. Finally, unique research opportunities are identified.