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Memory interference is a critical impediment to system performance in CMP systems. To address this problem, we first propose a Dynamically Proportional Bandwidth Throttling policy (DPBT), which dynamically throttles back memory-intensive applications based on their memory access behavior. DPBT achieves a more balance memory bandwidth partitioning. Moreover, we improve the previous memory channel partitioning...
This paper focuses on the wireless monitoring sensor networks (WMSNs), where provide relay connectivity for the low capacity and power devices to monitor or sense the events in a monitoring area. In this paper, we propose the relay OFDMA resource allocation methods of coloring resource allocation, static resource allocation and dynamic resource allocation to improve the finite resource of time and...
Wireless interface bonding is an important technique in multiradio systems, where multiple radios can be combined to establish a fast link between nodes. However, existing interface bonding modules are not well-suited for wireless interfaces due to lack of functionalities to cope with varying channel capacity. Variance in throughput and delay of the individual radios can cause significant degradation...
Recently, the concept of heterogeneous networks (HetNets) has been proposed as an alternative solution to provide higher coverage and capacity for cellular networks. In HetNets concept, many of small base stations (SBSs) are employed in the existing cell of macro base stations (MBSs) to increase the coverage and system capacity. However, the employment of many SBSs in the existing macro cells would...
The paper focuses on the free products used to setup an Software-Defined Network by emulation and real experimentation. Because SDN networking is a challenging research area, objective of this paper is to provide assistance to researchers wishing to evaluate their SDN work in an experimental setting. In this paper, two collections of open source OpenFlow switches; Open vSwitch (OVS) and ofsoftswitch13...
Inter-domain link congestion can be caused by either under-provision or peer disputes. TSLP and M-Lab are two representative network-tomographic methods to detect congestion on inter-domain links. In this work, we propose a performancecost framework to evaluate and compare the two methods via a simulator built atop NS-3. Via detailed simulations, we obtained some insights on the two approaches and...
In this paper, we provide joint subcarrier assignment and power allocation schemes for quality- of-service (QoS)-constrained energy-efficiency (EE) optimization in the downlink of an orthogonal frequency division multiple access (OFDMA)-based two-tier heterogeneous cellular network (HCN). Considering underlay transmission, where spectrum- efficiency (SE) is fully exploited, the EE solution involves...
With the exponential growth of the mobile video traffic and the dramatic diversity of wireless channels among users, maintaining a tradeoff between resource consumption and perceived experience of users is of overwhelming challenges. Dynamic Adaptive Streaming over HTTP(DASH), as a promising technique to improve the video transmission efficiency, achieves bitrate adaption at users' ends to accommodate...
We investigate the overlay coding scheme as the capacity achieving multi user detection (MUD) technique, i.e., transmitting over non-orthogonal channels, in forward link in multi-beam satellite systems with dense frequency reuse. The classic overlay coding scheme, uses the strongest co- channel interference (CCI) as extra source of information. The data intended for the target user is shared between...
The cellular data traffic has been dramatically increased, a typical approach is considering the operation of the Long Term Evolution (LTE) system in the unlicensed spectrum. Although there are a large number of theoretical researches on LTE-U, field trial results are still lacking. In this paper, we build a real time field trial in 5.8GHz unlicensed bands. The typical indoor scenario is deployed...
Data movement to and from off-chip memory dominates energy consumption in most video decoders, with DRAM accesses consuming 2.8x–6x more energy than the processing itself. We present a H.265/HEVC video decoder with embedded DRAM (eDRAM) as main memory. We propose the following techniques to optimize data movement and reduce the power consumption of eDRAM: 1) lossless compression is used to store reference...
In this work, we introduce a powerful hardware-based rogue access point (PrAP), which can relay traffic between a legitimate AP and a wireless station back and forth, and act as a man-in-the-middle attacker. Our PrAP is built of two dedicated wireless routers interconnected physically, and can relay traffic rapidly between a station and a legitimate AP. Through extensive experiments, we demonstrate...
The various flows in production datacenters usually can be classified into two types: bandwidth-hungry and delay-sensitive. To improve their performance, datacenter networks require effective load balancing and flow control protocols, respectively. However, as the two techniques are typically employed separately in current datacenters, they are unable to optimize the network in a coordinated way....
Licensed-Assisted Access (LAA) is a new operation mode for the Long Term Evolution Advanced systems to transmit data via both licensed spectrum and unlicensed spectrum based on the framework of carrier aggregation. For LAA uplink (UL) transmission, there is a mismatch between resource allocation and actual data transmission due to the requirement of listen-before-talk (LBT). Such a mismatch may cause...
Distributed applications deployed in multi-datacenter environments need to deal with network connections of varying quality, including high bandwidth and low latency within a datacenter and, more recently, high bandwidth and high latency between datacentres. In principle, for a given network connection, each message should be sent over the best available network protocol, but existing middlewares...
Wi-Fi is the dominant wireless indoor broadband solution and thus key for meeting the exponential traffic growth. The recent IEEE 802.11ac amendment enables PHY data rates exceeding 1 Gbps. However, it is not clear how this increased per-link performance, achieved especially via wider channels, translates to network-level performance. The latter is crucial for understanding the true potential of emerging...
The lower layer characteristics of 60 GHz wireless networks impact the entire protocol stack. This includes effects such as sudden link failure due to blockage, high packet loss due to deafness, or suboptimal transmit rates due to antenna misalignment. To understand the resulting behaviors at the upper layers, it is key to have access to lower layer information. At the time of writing, 60 GHz experimentation...
Upload and download traffic often coexist in mobile networks. However, TCP download throughput could be substantially degraded by upload traffic even if the downlink is not the bottleneck. Previous works such as RSFC and TCP-RRE can substantially improve TCP download throughput in the presence of concurrent TCP upload flows, albeit at the expense of significantly degraded upload throughput performance...
Big data has, in recent years, revolutionised an evergrowing number of fields, from machine learning to climate science to genomics. The current state-of-the-art for storing large datasets is either object stores or distributed filesystems, with Hadoop being the dominant open-source platform for managing ‘Big Data’. Existing large-scale storage platforms, however, lack support for the efficient sharing...
Due to the widespread use of broadband communication media, it is often the case that the conventional TCP cannot fully utilize such broad bandwidth; hence, many improvements on TCP itself and a lot of accelerating methods which use multiple TCP flows have been proposed. In addition, video hosting services on the Internet as a new medium have become popular, and progressive downloading methods, which...
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