iNEMI project on process development of BiSn-based low temperature solder pastes: Part III: Mechanical shock tests on POP BGA assemblies

  • Aspandiar R.
  • Byrd K.
  • Chen J.
  • Chen Q.
  • Cheng S.
  • Coyle R.
  • Feng S.
  • Fu H.
  • Krmpotich M.
  • Mokler S.
  • Radhakrishnan J.
  • Ribas M.
  • Sandy-Smith B.
  • Tang K.
  • Wu G.
  • Zhang A.
  • Zhen W.

Lowering peak reflow temperature from the current 240°C+ level for SnAgCu (SAC) solder paste during the assembly of electronic board products has economic, environmental and technical benefits. The Bi-Sn solder system is one low melting metallurgical system of interest, but the inherent brittleness of bismuth is its major drawback. Recently, ...

Optimizing Data Plans: Usage Dynamics in Mobile Data Networks

  • Andrews M.
  • Carlee Joe-Wong
  • Chiang M.
  • Joe-Wong C.
  • Liang Zheng
  • Mung Chiang
  • Zheng Liang

As the U.S. mobile data market matures, Internet service providers (ISPs) generally charge their users with some variation on a quota-based data plan with overage charges. Common variants include unlimited, prepaid, and usage-based data plans. However, despite a recent flurry of research on optimizing mobile data pricing, few works have ...

Designing Optimal Middlebox Recovery Schemes with Performance Guarantees

  • Kanizo Y.
  • Rottenstreich O.
  • Segall I.
  • Yallouz J.

Enabling functionality in modern network is achieved through the use of middleboxes. Middleboxes suffer from temporal unavailability due to various reasons, such as hardware faults. We design a backup scheme that takes advantage of Network Function Virtualization (NFV), an emerging paradigm of implementing network functions in software, deployed on commodity ...

Distributed energy saving management in multi-layer 4G/5G ultra-dense networks

  • Ali-Tolppa J.
  • Mwanje S.

Energy consumption in mobile networks rises with increase in cell density. This trend will only continue in the future multi-layer 5G-related Ultra-Dense Networks (UDN) that are characterized by high number and density of cells in multiple radio technologies each in one or more layers. Several Energy Saving Management (ESM) solutions ...

Channel measurements and preliminary performance results for indoor time-of-arrival localization

  • Geng C.
  • Huang H.
  • Latinovic Z.

We study the performance of time-of-arrival (ToA) localization for an indoor office environment. We transmit 10MHz and 100MHz waveforms over the 5.8GHz ISM band and measure complex I-Q samples using precisely calibrated and synchronized channel sounding equipment in line-of-sight (LOS) and non- line-of-sight (NLOS) channels. The ToA is estimated using ...

Backwards Composite Feedback for Configurable Ultra-Reliability of Retransmission Protocols

  • Khosravirad S.
  • Viswanathan H.

Future wireless networks envision ultra-reliable, ultra-low latency communication with efficient use of the limited wireless channel resources. Closed-loop retransmission protocols, such as automatic repeat request (ARQ), where retransmission of a packet is enabled using a feedback channel has been adopted since early days of wireless telecommunication to achieve the required ...

Dynamic Control of RLC Buffer Size for Latency Minimization in Mobile RAN

  • Francini A.
  • Rajeev Kumar
  • Sharma S.
  • Shivendra Panwar

End-to-end packet latency is a defining component of the Quality of Experience (QoE) delivered to end users by interactive network applications. The tight latency requirements of those applications may be violated when they share packet buffers with elastic applications that use greedy TCP sources for end-to-end transport. The accumulation of ...

Design Principles for Ultra-dense Wi-Fi Deployments

  • Gacanin H.
  • Ho L.

Future indoor networks need to provide broadband services either by increasing bandwidth, higher order modulations and high spatial reuse. To this end, ultra-dense Wi-Fi networks need to be deployed. This work discuss design principles of ultra-dense gigabit Wi-Fi networks through proper bandwidth selection, adaptive CCAs. We present power control management ...

Network slices for vertical industries

Network Slicing allows to simultaneously support the specific needs of vertical industries with a diverse range of networking and computing requirements. Network Functions Virtualization (NFV) has been defined to deploy multiple network services on a common infrastructure. We extend the NFV concept to vertical services, i.e. services implemented on top ...

Positioning of high-speed trains using 5G new radio synchronization signals

We study positioning of high-speed trains in 5G new radio (NR) networks by utilizing specific NR synchronization signals. The studies are based on simulations with 3GPP-specified radio channel models including path loss, shadowing and fast fading effects. The considered positioning approach exploits measurement of Time-Of-Arrival (TOA) and Angle-Of-Departure (AOD), which ...

Average downlink SINR model for 5G mmWave networks with analog beamforming

Millimeter-wave frequency bands enable the deployment of small-sized antenna arrays in the fifth generation of mobile networks, which provide high beamforming gain for both transmitter and receiver. In order to study user mobility, a computationally efficient simulator is needed that runs with a time step resolution that is higher than ...

Performance analysis of uplink massive MIMO networks with a finite user density

In this paper, we conduct performance analysis for uplink (UL) massive multiple input and multiple output (mMI-MO) networks using stochastic geometry. With the consideration of practical system assumptions, such as sophisticated path loss model incorporating both line-of-sight (LoS) and non-line-of-sight (NLoS) transmissions and a finite user equipment (UE) density, we ...

Promises and caveats of uplink IoT ultra-dense networks

  • Ding M.
  • Perez D.

In this paper, by means of simulations, we evaluate the uplink (UL) performance of an Internet of Things (IoT) capable ultra-dense network (UDN) in terms of the coverage probability and the density of reliably working user equipments (UEs). From our study, we show the benefits and challenges that UL IoT ...

LTE radio measurements above urban rooftops for aerial communications

This paper focus on the investigation of aerial communications for drones connected to cellular networks in urban areas. Most of the previous measurement based channel models for urban environments do not extend to users located at heights above rooftops. On the other hand, UAVs are expected to fly at the ...

Indoor massive MIMO deployments for uniformly high wireless capacity

Providing consistently high wireless capacity is becoming increasingly important to support the applications required by future digital enterprises. In this paper, we propose Eigen-direction-aware ZF (EDA-ZF) with partial coordination among base stations (BSs) and distributed interference suppression as a practical approach to achieve this objective. We compare our solution with ...

Performance benchmark of transcoding as a virtual network function in CDN as a service slicing

Content delivery networks (CDNs) have been widely implemented to provide scalable cloud services. Such networks support resource pooling by allowing virtual machines to be dynamically running or stopping according to current users' demands. Recently, there has been an increasing interest in Network Function Virtualization (NFV) as an emerging technology that ...

Uplink performance analysis of a drone cell in a random field of ground interferers

Aerial base stations are a promising technology to increase the capabilities of existing communication networks. However, existing analytical frameworks do not sufficiently characterize the impact of ground interferers on aerial base stations. In order to address this issue, we model the effect of interference coming from coexisting ground networks on ...

Bankruptcy game based resource allocation algorithm for 5G Cloud-RAN slicing

Recently, network slicing which addresses the deployment of multiple logical networks as independent business operations on a common physical infrastructure has attracted more and more attentions. Despite the advances of network slicing, there are still many open issues regarding the isolation of the wireless slices and resources allocation. The paper ...

LEAP: A latency control protocol for multi-path data delivery with pre-defined QoS guarantees

  • Chiariotti F.
  • Claussen H.
  • Kucera S.
  • Zanella A.

Wireless Gigabit networks based on the 5G New Radio and WiGig standards are expected to enable new throughput-intensive applications such as Virtual/Augmented Reality, high-resolution video chats, and remote control of unmanned terrestrial and aerial vehicles. However, the interactive nature of such applications implies the need for reliable and timely delivery ...

QoE Driven SON for Mobile Backhaul Demo

  • Bajzik L.
  • Deák C.
  • Karasz T.
  • Szilagyi P.
  • Vincze Z.
  • Vulkán C.

T?he complexity of the Mobile Backhaul (MBH) and the unpredictability of the mobile traffic represents a network operation challenge. Increasing the automation of the transport service management by introducing the Self Organizing Networks (SON) concept to MBH can significantly simplify the network configuration process, reduce the cost of operation and ...