Anton Ambrosy

Architecture Approaches for 5G Millimetre Wave Access Assisted by 5G Low-Band Using Multi-Connectivity

One of the key technology components envisioned for the delivery of extreme mobile broadband in 5G networks is the radio access using millimetre waves. However, using this technology, it is challenging to provide reliable and seamless data transmission to the users. Due to the propagation characteristics of millimetre waves, high interruption times may occur if line of sight is obstructed between the transmitter and the receiver. Therefore, we propagate that cellular deployment of systems using millimetre waves must be supported by the low-band (below 6 GHz) coverage and the 5G network should be able to provision multiple millimetre waves links for a user. For this purpose, we propose novel functionalities required for Multi-Connectivity in 5G. In line with our proposal, we present a set of different potential architectures for 5G radio access network and discuss their protocol and functional requirements. A qualitative assessment is carried out by comparing the required messages and the potential pros and cons for each architectural approach. Based on the evaluation, some recommendations are highlighted for the design of future 5G access network incorporating millimetre waves transmission.

IP based Seamless Mobility Support in Heterogeneous Networks – Evaluation of Handover Mechanisms for Future Heterogeneous 3GPP Networks (IP basierte nahtlose Mobilitätsunterstützung in heterogenen Netzwerken – Evaluierung von Handover-Mechanismen für zukünftige heterogene 3GPP Netzwerke)

Mobile IP (MIP) protocols are candidates for seamless mobility support in heterogeneous networks with different radio access technologies. Handover requirements are analysed by Random-Way-Point mobility simulations. We then simulated packet loss, delay and network load during MIP and Fast MIP handover to identify the main contributions to handover latency. Best performance is found for MIP in Make-Before-Break scenario. Mobil IP (MIP) Protokolle sind Kandidaten für die nahtlose Handover-Unterstüzung in Radio-Zugangsnetzen mit unterschiedlichen Radiotechniken. Die Handover-Anforderungen wurden mit Random-Way-Point-Simulationen analysiert. Danach haben wir Paketverluste, Verzögerungen und die Netzwerklast bei MIP- und FastMIP-Handovern untersucht, um die Hauptursachen für Unterbrechungszeiten zu identifizieren. Das beste Verhalten zeigt MIP mit Make-Before-Break.

Signalling Minimization Framework for Short Data Packet Transmission in 5G

Current cellular networks are mainly designed for the transmission of broadband packet payloads. Due to this, signalling mechanisms are inefficient for small packet payloads. Future trends predict an explosion of sporadic small packet transmissions due to machine type and always-ON type applications. Therefore, we target signalling minimization in 5G. In particular, we define user and service centric connection and mobility management by 5G radio access network (5G-RAN). The key idea is to anchor the core network connection for a user in 5G-RAN with the help of a user centric mobility area. This area is dynamically managed by 5G-RAN for each user. For a mobile user within this area, we minimize the core network signalling related to connection transitions, paging and handover. We present the performance assessment of our proposal with the help of simulations. The results show significant gains in terms of signalling reduction with respect to 4G-LTE approach.