José Núñez-Martínez's research while affiliated with Telefónica I+D and other places

Publications (42)

Article
The goal of 5G-Crosshaul is to integrate fronthaul and backhaul operation under the same data and control planes. This paper focuses on the latter, by experimentally showing the flexibility of the 5G-Crosshaul Control Infrastructure (XCI). In this sense, various network setups featuring heterogeneous network and computing resources and high-speed m...
Conference Paper
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Edge computing is considered a key enabler to deploy Artificial Intelligence platforms to provide real-time applications such as AR/VR or cognitive assistance. Previous works show computing capabilities deployed very close to the user can actually reduce the end-to-end latency of such interactive applications. Nonetheless, the main performance bott...
Conference Paper
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Millimeter wave (mmwave) communications will likely be an enabler for 5G due to its multi-gigabit per second throughput capabilities. Furthermore,mmWave communications will have to be integrated in a new redesigned network required by 5G to fulfill its ambitious targets. In this paper, we present the design and implementation of a management agent...
Article
Upcoming 5G mobile networks are addressing ambitious KPIs not just in terms of capacity and latency, but also in terms of network control and management. In this direction, network management schemes need to evolve to provide the required flexibility, and automated and integrated management of 5G networks. This also applies to the 5G-Crosshaul tran...
Article
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Due to the tremendous growth in mobile data traffic, cellular networks are witnessing architectural evolutions. Future cellular networks are expected to be extremely dense and complex systems, supporting a high variety of end-devices (e.g., smartphone, sensors, machines) with very diverse QoS requirements. Such amount of network and end-user device...
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SANSA (Shared Access terrestrial-satellite backhaul Network enabled by Smart Antennas) is a project funded by the EU under the H2020 program. The main aim of SANSA is to boost the performance of mobile wireless backhaul networks in terms of capacity, energy efficiency and resilience against link failure or congestion while easing the deployment in...
Article
Wireless redundant networks are expected to play a fundamental role to backhaul dense LTE networks. In these scenarios, backpressure-based routing strategies such as BP-MR can exploit the network redundancy. In this paper, we perform an exhaustive performance evaluation of different TCP variants over an LTE access network, backhauled by various rou...
Conference Paper
This paper analyzes the significant low performance of Backpressure routing protocols when combined with TCP-based flows. The issue is due to a mismatch between i) the congestion control mechanism of TCP and ii) the multi-path nature based on queue backlogs differentiation of the Backpressure algorithms. We aim to address this issue by introducing...
Article
The paper presents a study of key aspects in the design of a flexible unified data plane capable of integrating both fronthaul and backhaul transport in future 5 G systems. In this study, we first review candidate access and multiplexing technologies from the state of the art and assess their capability to support legacy and new fronthaul and backh...
Conference Paper
A transport network for 5G envisions integrating the fronthaul and backhaul segments (namely 5G-Crosshaul) into a single transport network. This requires a fully integrated and unified management of fronthaul and backhaul resources in a sharable, scalable and flexible way. The integrated and unified management of the transport network resources fol...
Article
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The Internet of Things (IoT) will facilitate a wide variety of applications in different domains, such as smart cities, smart grids, industrial automation (Industry 4.0), smart driving, assistance of the elderly, and home automation. Billions of heterogeneous smart devices with different application requirements will be connected to the networks an...
Conference Paper
5G has a main requirement of highly flexible, ultralow latency and ultra-high bandwidth virtualized infrastructure in order to deliver end-to-end services. This requirement can be met by efficiently integrating all network segments (radio access, aggregation and core) with heterogeneous wireless and optical technologies (5G, mmWave, LTE/LTE-A, Wi-F...
Article
The increase of demand for mobile data services requires a massive network densification. A cost-effective solution to this problem is to reduce cell size by deploying a low-cost all-wireless Network of Small Cells (NoS). These hyperdense deployments create a wireless mesh backhaul amongst Small Cells (SCs) to transport control and data plane traff...
Article
Small cells (SC) are low-power base stations designed to cope with the anticipated huge traffic growth of mobile communications. These increasing capacity requirements require the corresponding backhaul capacity to transport traffic from/to the core network. Since it is unlikely that fiber reaches every SC, a wireless mesh backhaul amongst SCs is e...
Article
Dense small cell (SC) deployments pose new architectural and transport level requirements. It is expected that they will require local multi-hop wireless backhauls in which some SCs with high capacity links towards the core act as aggregation gateways. To enable scalable deployments, there is the need of routing schemes able to handle dynamicity co...
Conference Paper
This paper presents Backpressure for sparse small cell deployments (BS), a transport network layer solution aimed to carry backhaul traffic under sparse topologies. BS leverages queue backlog and geographic information to take forwarding decisions on a per-packet basis, without incurring into excessive path lengths and queueing latencies. Simulatio...
Article
Nowadays, it is common to find multiple WLAN deployments coexisting in shared spaces. The resulting interference between transmissions represents an important source of performance degradation, specially those originating from hidden traffic. This note explores the relation between hidden traffic and packet losses, using renewal theory to show that...
Article
A deployment of femtocells that is harmonic with its environment is a challenging issue. In this respect, interference management has traditionally been in the spotlight. However, architectural improvements for efficient femtocell deployments, despite being equally relevant, have received less attention. This paper presents a system architecture co...
Article
Rapid prototyping of wireless network protocols is a recurring problem faced by experimental researchers. This feature is one of the biggest assets of the ns-3 emulation functionality. This paper provides the experimental evaluation of a novel distributed backpressure routing protocol implemented in ns-3 simulator exploiting the ns-3 emulation fram...
Conference Paper
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In our previous work on distributed backpressure routing for WiFi mesh networks (WMN), we showed that backpressure routing when combined with geographic information results in a (quasi-)stateless low-overhead (hence scalable) routing solution. Specifically, the Lyapunov drift-plus-penalty optimization framework allows trading off between 1) routing...
Conference Paper
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In this paper we propose a network infrastructure to be deployed in the aftermath of a disaster with the aim of providing communication services to both emergency responders and civilians. The proposed infrastructure is a Network of Small Cells powered by renewable energy that features an all-wireless multi-hop backhaul network together with self-o...
Conference Paper
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This paper studies practical backpressure routing strategies in WiFi-based Mesh Networks (WMN). It is practical in the sense that, unlike previous theoretical centralized algorithms, we present a distributed implementation of the algorithm with low queue complexity (i.e., one finite data queue at each node) to deal with any-to-any communications. T...
Conference Paper
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This paper evaluates the applicability to WMNs of dynamic backpressure routing strategies, which theoretically maximize throughput but can result in high end-to-end delays. We present a distributed and (quasi-)stateless routing protocol called DiPUMP (forwarDIng of Packets for distribUted resource consuMPtion). Unlike the theoretical form of the ba...
Conference Paper
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This paper explores the possibility to use the medium utilization as a metric to be included in Radio Environment Maps (REMs) of WLAN networks. The main objective is to build REMs that go beyond the spectrum use and that can be used to improve deployment and operation of WLANs. Specifically, the paper focuses on, first, exploring the possibility to...
Conference Paper
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In this paper we explore the concept of an all-wireless Network of Femtocells (NoF). A NoF can be seen as a wireless mesh network providing multi-hop connectivity amongst femtocells and, in turn, to the Evolved Packet Core (EPC). As specified by 3GPP Technical Specifications (TS), IP networks are used to transport data through any interface and, in...
Conference Paper
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In this paper we present a framework within ns-3 developed to support an emerging class of wireless routing protocols, called dynamic backpressure routing protocols. Specifically, we provide the design and implementation particularities introduced by dynamic backpressure routing within the ns-3 simulator. In addition, we describe the implementation...
Conference Paper
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This paper presents the experimental performance evaluation of the distributed Virtual Home Region Multi-Hash Location Service (VIMLOC). This is, up to our knowledge, the first location management scheme specifically designed and implemented for medium/large-scale wireless mesh networks (WMNs,) which are seen as a cost-effective solution to provide...
Conference Paper
Hidden traffic interference has been identified as an important source of network instabilities in dense wireless network deployments. This paper follows recent research results that relate packet loss and hidden traffic interference and explores, through extensive experimentation, the possibility to infer hidden traffic load using loss measuremen...
Article
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Recent research results have shown how measurements of bandwidth metrics using traditional tools and techniques have to be reconsidered in the presence of WLAN links. The main reason behind this is the CSMA/CA protocol used to regulate the distributed access in the wireless medium. In this paper we identify a set of practical issues that tools base...
Article
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We validate the IEEE 802.11 MAC layer model in ns3 by means of measurements on the EXTREME testbed. We consider different scenarios: communications within a single pair of nodes, multi-user communications using either VoIP or saturated traffic, and communications in the presence of hidden nodes. For each scenario we describe in detail our testbed a...
Conference Paper
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Fast Handovers is an enhancement to the Mobile IPv6 protocol, currently specified in an IETF draft, which reduces the handover latency. This can be beneficial to real-time applications. This paper presents a novel implementation of Fast Handovers and an analysis of the handover. Using a real testbed we study the handover latency and the provided Qo...
Article
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This paper focuses on a measurement-based comparison of the handover for different mobility protocols: Mobile IPv4, Mobile IPv6 and Fast Handovers for Mobile IPv6. The paper studies the handover using active and passive measurements computing the handover latency, packet losses and the provided QoS level in a real testbed. Our experimental results...

Citations

... Taking into account the increasing convergence of fronthaul and backhaul networks, it is worth mentioning recent backhaul routing solutions for 5G scenarios. Works [28] and [29] apply backpressure routing to communicate cellular base stations through a wireless backhaul network. Also, routing over millimeter wave (mmWave) links has been analyzed, jointly with link scheduling [30] and with beam alignment [31]. ...
... Under the hood, the app invokes an NLP model in order to infer on user input. It is often desirable to execute NLP inference on device, which crucially preserves user data privacy and eliminates long network trips to the cloud [49,11]. ...
... In view of this observation, [28] propose a model for calculating energy consumed in the network considering the energy consumed by a transponder, an optical switch, and optical amplifier from [29,30]. In the following, we define the (11) Where, N is the degree of the node.  is the number of selective add and remove switches for the node. ...
... The cost of applying such systems rises dramatically when all of the abovedescribed qualities are combined. In contrast, the authors in [101] proposed a new method called hybrid-SDN to operate the network regardless of the level of control vulnerability by shifting network control from central to distributed. This approach depends on the Control Packet Loss Ratio (CPLR). ...
... However, the trend towards packetbased FH fosters a unified transport network to fulfil the requirements of all RAN splits (including regular BH traffic). Hence, recent research studies aim at designing an integrated FH and BH network architecture under the control of an SDN Transport Orchestrator [24,25]. Furthermore, the envisaged deployment scenarios for 5G networks usually entail a variety of transport technologies that, ideally, should be managed homogeneously [26]. ...
... [71] Energy efficiency of radio access, which is at the heart of wireless networks. [73] Big data and the promise of ML for optimization and decisionmaking in 5G networks. ...
... The design of backhaul networks should adhere to three key principles [151]: (i) together with conventional terrestrial backhaul networks, the satellite network transmit information as a critical part in the tight integration backhaul system, (ii) the topology of the terrestrial backhaul systems are adaptive to communication events and can be modified according to requirements, and (iii) satellite-terrestrial networks should be entitled the cognitive spectrum ability. In particular, it is worth to mention that ultra-dense LEO satellite networks with high frequency band and appropriate service coverage have been introduced into the architecture to achieve optimal backhaul capacity [152]. ...
... Núñez et al. proposed in [16], [17] another variant based on the previous Lyapunov drift-plus-penalty optimization technique, with the ability to handle congestion level information in order to deliver packet with shorter end-to-end delay, using a less complex queue management strategy. We extended this work in [6], where we proposed two schemes aiming to enhance interaction between the dynamic Backpressure routing and TCP's (Transmission Control Protocol) congestion control algorithm. The proposition shows a better performance, however with the same limitation as all the previous propositions: the absence of any mechanism able to prioritize some traffic flows against others. ...
... TCP's congestion control algorithm [12] implementation mainly depends on slow start (SS) and congestion or bottleneck avoidance (CA) phases. The SS phase prevents the sender from transmitting a large chunk of data during the startup, leading to network congestion or sudden network traffic overload. ...
... Several works proposed and evaluated different software defined networks (SDNs) architectures where the integration with satellite mmWave links are present and are used to improve the performance of terrestrial networks, to improve resilience [64] or to increase flexibility [65]. In the SANSA project [66], a spectrum efficient self-organizing hybrid terrestrial-satellite backhaul network is presented enabled by smart antenna techniques at mmWave and software defined intelligent hybrid network management. On the other hand, [67] studied a cloudbased ground-space network design to support high speed multimedia services. ...