D4.3 Final Report on Network-Level Solutions

Research activities in METIS reported in this document focus on proposing solutions to the network-level challenges of future wireless communication networks. Thereby, a large variety of scenarios is considered and a set of technical concepts is proposed to serve the needs envisioned for the 2020 and beyond. This document provides the final findings on several network-level aspects and groups of solutions that are considered essential for designing future 5G solutions. Specifically, it elaborates on: -Interference management and resource allocation schemes -Mobility management and robustness enhancements -Context aware approaches -D2D and V2X mechanisms -Technology components focused on clustering -Dynamic reconfiguration enablers These novel network-level technology concepts are evaluated against requirements defined by METIS for future 5G systems. Moreover, functional enablers which can support the solutions mentioned aboveare proposed. We find that the network level solutions and technology components developed during the course of METIS complement the lower layer technology components and thereby effectively contribute to meeting 5G requirements and targets.Aydin, O.; Valentin, S.; Ren, Z.; Botsov, M.; Lakshmana, TR.; Sui, Y.; Sun, W.... (2015). D4.3 Final Report on Network-Level Solutions. http://hdl.handle.net/10251/7675

On the overhead of radio resource management schemes for mobile underlay D2D communication

Device-to-Device (D2D) communications as an underlay to future 5G networks is being considered as a suitable platform for vehicular communication. Key in this regard is intelligent Radio Resource Management (RRM), which needs to provision adequate quality of service, in terms of the reliability and latency of vehicular transmissions. The classical approach building upon Channel State Information (CSI) is assumed to have high management overhead due to the acquisition of the said information. Hence, alternative RRM schemes, which rely on, e.g., location information, have also emerged. Such schemes, however, are more conservative in regards to the reuse of radio resources and have lower spectral efficiency. In this paper, we compare the performance of two RRM schemes for vehicular D2D underlay networks - a CSI-based one and a location-based one, in terms of their required measurement overhead, with implications to general schemes of the respective class

On the Transport Capacity of Next-generation Cellular Networks with Vehicular D2D Underlay

In this paper, we analyze the capacity of future cellular networks with a Device-to-Device (D2D) underlay reusing cellular uplink radio resources. We consider two resource reuse strategies and observe the behavior of the two-tier network with respect to the per-user transport capacity in both network layers. Our results indicate that the trend of network infrastructure densification and the prioritization of cellular communication over direct links might hinder D2D communication. Hence, careful system design is essential in order to enable additional D2D-based (e.g., automotive) applications in the next-generation cellular networks

Optimized zone design for location-based resource allocation in mobile D2D underlay networks

Radio resource management plays a crucial role in the context of mobile Device-to-Device (D2D) communication with strict requirements on the quality of service. Addressing some of the faced issues we have previously defined a Location Dependent Resource Allocation Scheme (LDRAS). In this work we enhance its performance in heterogeneous radio propagation environments. To this end, we optimize the transmission parameters for D2D communication by employing sequential quadratic programming and formalize the definition of the underlying zone topology by means of hierarchical clustering. Moreover, we compare the performance of the enhanced LDRAS against a selected state-of-the-art reference scheme with respect to the reliability and availability requirements of automotive applications

STFDMA: A novel technique for ad-hoc V2V networks exploiting radio channels frequency diversity

Device to Device (D2D) communication underlaying a cellular infrastructure has attracted a great deal of attention due to its potential of enhancing capacity while reducing load and energy consumption, among other features. In turn, vehicle to vehicle (V2V) communication is envisioned as a special case of D2D, where vehicles driving closely exchange messages about the driving conditions to improve the safety on the road with little support from the base station (BS). In safety applications, however, it is essential that the communication can be maintained even if the cellular infrastructure is not available due to a coverage hole or a temporary network failure. In this paper, we present a novel technique called self-organizing time-frequency division multiple access (STFDMA) to allow vehicles to communicate efficiently in an ad-hoc manner while network assistance is not available. It has two main advantages compared to the very well known IEEE 802.11p standard: (i) It is compatible with envisioned fifth generation (5G) cellular networks, and (ii) it has a deterministic medium access delay, unlike carrier sense multiple access with collision avoidance (CSMA/CA), method used in 802.11p. This is achieved by (i) reconstructing the channel gains over frequency of one device to the neighboring ones, (ii) allocating resources in a distributed manner, and (iii) adapting the transmission to the estimated channel quality