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Named Data Networking (NDN) is an Information-Centric Networking architecture that has recently attracted significant attention. NDN rethinks the Internet communication paradigm around the name of the data instead of its location. In Content-Oriented architectures, in-network caching enables data retrieval from different network nodes and may result in frequent data sources changes and wide RTT fluctuations...
In order to solve the rbuf blocking in concurrent multipath transfer, firstly, this paper analyzes the reason for receiving buffer blocking and the disadvantages of traditional retransmission policies. And then, it proposes an improved retransmission policy — RTX-CR (retransmission-congestion window and RTT), which can reduce rbuf blocking. The simulation indicates that the retransmission policy can...
A new 6D mesh/torus (Tofu) interconnect is implemented in the K Computer for achieving a performance of more than 10 petaflops. As expected, among its many interesting properties, such interconnect has large variations of latencies for communications within a node-group (intra-node-group) or between them (inter-node-group). Inspired by their works while recognizing the superior features of the recently...
Manycore systems require energy-efficient on-chip networks that provide high throughput and low latency. The performance of these on-chip networks affects cache access latency and, consequently, system performance. This paper proposes solutions to address the performance limitations related to the use of snoop-based cache coherence protocol on switched network-on-chip (NoC). We propose a new network...
For sensor networks, the extension of operating time by controlling power consumption is an important research subject. In a receiver-driven communication protocol, a receiver node transmits its ID to the sender node periodically, and in response the sender node sends an acknowledgment. The average power consumption of the network can be controlled, but a part of the network shuts down when the battery...
Multiple Access with Salvation Army Protocol (MASA) achieves the higher aggregate throughput than IEEE802.11DCF via packet salvaging at the MAC layer. The implementation of MASA is based on DCF specification. But the back off timer of SACK in MASA is different from that of DATA in DCF. The MASA selects (0, NAV) as the back off range of SACK, whereas DCF thinks the channel is busy in this duration...
For control systems the timely and dependable transmission of sensor data to a controlling instance is a necessary precondition to perform the intended control task. Yet the communication infrastructures used for this purpose usually have to work under difficult circumstances in the field, e.g., wireless networks might be lacking energy to successfully transmit data. In order to guarantee the robustness...
This Letter proposes a fast selective ACK scheme for Stream Control Transmission Protocol (SCTP) to enhance transmission throughput in multi-homing scenarios. In the proposed scheme, a multi-homed receiver sends SACK chunks to the sender over the fastest reverse path, which facilitates to inflate the congestion window and to retransmit the lost data packets as quickly as possible. Simulation results...
In wireless sensor network research, simulation is one of the most important approaches to evaluate system or protocol performance. The accuracy of estimated results depends on selected simulation parameters. In existing analysis on wireless sensor network, simple interference models are used in simulations, which only take interference signals from nodes in a particular range into account. Based...
In multicast group planning in tactical networks (TNs), one of the most important challenges is to maximize the efficient use of network and end-user resources. Hence, multicast groups should be planned cleverly such that the total shared link capacity in a multicast distribution tree is increased and the reception of unwanted traffic at receiver nodes is reduced to a maximum extent. In this paper,...
Service discovery is one of the most fundamental building blocks of self-organization. While mature approaches exist in the realm of fixed networks, they are not directly applicable in the context of MANETs. We investigate and compare two different protocols as basis for service discovery, namely OLSR and WCPD. OLSR is a proactive routing protocol while WCPD is a path discovery protocol integrating...
This paper describes a comparative analysis between two topologies of operational amplifiers to design a 40 MS/s 12-bit pipeline analog to digital converter (ADC). The analysis includes AC and transient simulation to select the proper topology. This ADC is implemented in a 0.35 mum AMS CMOS technology with 3.3 V single power supply. The capacitors and selected operational amplifiers were scaled for...
Opportunistic routing (OR) schemes, such as ExOR, have been shown to provide significant throughput gains over traditional best-path routing schemes for wireless networks. Though the performance of OR schemes depend on the bit-rate, they currently use a fixed rate for transmitting packets. While several schemes have been proposed for selecting bit-rate for unicast transmission to a single receiver,...
Advances in micromachining technology can facilitate the integration of SAW (Surface Acoustic Wave) devices and CMOS circuitry on IC scale substrate for Monolithic fabrication. The optimal design and performance of these filters can be reached by using new Smart materials. The key component in the structure of the SAW device is the piezoelectric materials used which depends mainly on some important...
In this paper, we evaluate network performance of non-acknowledged packet transfer in relatively large IEEE 802.15.4 network. Network under consideration contains six interconnected IEEE 802.15.4 beacon enabled network clusters in triangular topology using slave-slave (SS) bridges with CSMA-CA access. We investigate the interactions among local nodes, local bridges and remote bridges. Simulation results...
In this paper, we propose an adaptive pacing scheme at the link layer for IEEE 802.11 based multihop wireless networks. Our objective is to improve the performance of higher layer protocols without any modifications to them. Our adaptive pacing scheme estimates the four-hop transmission delay in the network path without incurring any additional overheads, and accordingly paces the packets to reduce...
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