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CPU-GPU heterogeneous systems are emerging are emerging as architectures of choice for high-performance energy-efficient computing. Designing on-chip interconnects for such systems is challenging: CPUs typically benefit greatly from optimizations that reduce latency, but rarely saturate bandwidth or queueing resources. In contrast, GPUs generate intense traffic that produces local congestion, harming...
Internet of Things (IoT) traffic will become increasingly heterogeneous not only in terms of traditional metrics as required bandwidth and maximum latency, but also in terms of functional requirements such as compute power and temporary storage. Sophisticated planning and engineering approaches must be adopted by service providers to account for this heterogeneity, inherent in IoT applications. Metropolitan...
The development of the fifth generation (5G) wireless technology is in progress to address the increasing demands for high capacity, low latency, and ubiquitous mobile access instigated by next-generation mobile and machine-centric applications. The Centralized/Cloud-Radio Access Network (C-RAN) architecture exploiting the small-cell paradigm has been identified as a promising approach to address...
A fundamental problem to be resolved to achieve carrier grade functioning of an SDN network is the controller placement problem. The problem has been traditionally limited to optimally assigning switches to static physical controllers and placing those controllers over a network topology. However, virtualized controllers in place of physical ones could largely increase the dynamism in network control...
As a potential candidate architecture for 5G systems, cloud radio access network (CRAN) enhances the system's capacity by centralizing the processing and coordination at the central cloud. However, this centralization imposes stringent bandwidth and delay requirements on the fronthaul segment of the network that connects the centralized baseband processing units (BBUs) to the radio units (RUs). Hence,...
A 0.5–3GHz true-time delay (TTD) phase shifter circuit is implemented. Basing on active delay cells and active switches, the coarse delay is achieved. The LC artificial transmission line (ATL) provides continuous delay. The delay variation of the total delay is less than 2.4%. Using broadband matching and shunt peaking techniques, larger bandwidth and flatter group delay is obtained in phase shifter...
With the increasing usage of cloud computing and dependence on a diverse set of distributed applications, users are reliant on consistent outcomes from a shared infrastructure. This drives the need for improved QoS guarantees for heterogeneous communication requirements over shared networks. The Recursive Inter-Network Architecture (RINA) is a fundamental programmable network architecture that provides...
Future network services and applications, such as coordinated remote driving or remote surgery, pose serious challenges on the underlying networks. In order to fulfill the extremely low latency requirement in combination with ultrahigh availability and reliability, we need novel approaches, for example to dynamically move network “capabilities” close to the users. This requires more flexibility, automation...
Multipath forwarding consists of using multiple paths simultaneously to transport data over the network. While most such techniques require endpoint modifications, we investigate how multipath forwarding can be done inside the network, transparently to endpoint hosts. With such a network-centric approach, packet reordering becomes a critical issue as it may cause critical performance degradation....
This paper presents a 4.4Gbps/pin all-digital LPDDR4 PHY with a bit-slice architecture in 10nm FinFET process technology. The proposed bit-slice architecture includes new I/O structure for area reduction without any off-chip performance degradation and digital duty-tuning capability to maximize the valid window margin, which contributes to low voltage operation in memory interface system. The test...
This paper presents an architecture that supports Quality of Service (QoS) in an Arrowhead-compliant System of Systems (SoS). The Arrowhead Framework supports local cloud functionalities for automation applications, provided by means of a Service Oriented Architecture (SOA), by offering a number of services that ease application development. On such applications the QoS guarantees are required for...
Passive Optical Network (PON) is the most promising technology in optical access network, and the effective and reasonable upstream dynamic bandwidth allocation (DBA) is the key. This paper proposes a new software defined WDM-TDM PON frame that enable more users to share a single high-capacity fiber access as well as introduce a flexible DBA module to replace the hardware-configured DBA module. The...
Many LTE-Advanced algorithms and protocols rely on node coordination and cooperation to reduce power consumption, increase spectral efficiency and improve cell-edge performance. Functions such as Coordinated Multi Point, Network Assisted Handover, etc., require a standard connection among nodes to support their operations. The LTE X2 interface meets the above requirements and allows operators to connect...
This paper presents a continuous time sigma delta ADC for 50 MHz bandwidth with 80 dB resolution, which overcomes the shortcomings of known architectures. It incorporates a 5 bit flash ADC as a quantizer with a current steering feedback DAC employing dynamic element matching. The main feedback path and the fast feedback path around the quantizer have shifted delays to compensate for the excess loop...
In this paper, we consider two Network-on-Chip (NoC) architectures used within commercially available many-core systems, namely Tilera TILE64 which implements flow regulation within routers and KalRay MPPA 256 which implements flow regulation in source nodes. The Worst-Case Traversal Time (WCTT) on the NoC has to be bounded for real-time applications, and buffers should never overflow. Different worst-case...
In emerging cellular systems, optical fronthaul is expected to play a major role to support many control operations, e.g., Coordinated Multipoint (CoMP). CoMP is a promising technique for interference mitigation as it can transform interfing signals into joint transmission (reception) in which signals from adjacent cell sites are simultaneously transmitted (received) to (from) mobile terminals. But...
Because of the expansion of high performance computing (HPC) and server market, demand for HBM DRAM is increasing. With this market flow, diverse customers require various HBM product families. One customer requirement is full bandwidth with less density. Therefore, this work presents a HBM DRAM, which supports 4, 8, and even 2-hi stacks with full-bandwidth performance. The HBM DRAM adopts a peripheral...
Cellular networks do not have enough capacity to accommodate the exponential growth of mobile data requirement. Data can be delivered between mobile terminals through peer-to-peer WiFi communications (e.g. WiFi direct), but contacts between mobile terminals are frequently disrupted because of the user's mobility. This paper proposes a Subscribe-and-Send architecture, under which a user subscribes...
Peer-to-peer (P2P) is a decentralized communications model which was originally used for file sharing, and more recently for real-time communications and media streaming. Due to the utilization of resources, demand of peer to peer network is increasing rapidly and today significant part of the Internet traffic is generated by peer-to-peer (P2P) applications. Live video streaming in peer to peer network...
The advance in vehicular and wireless communications has contributed to the release of Vehicular Clouds which makes it possible to release various multimedia and storage services. However, providing a communication service which allows to cope with the high mobility of vehicles, and the limited availability of wireless resources, while guaranteeing a high quality of service (QoS), is a challenging...
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