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This paper proposes a new congestion control method based on a hop-by-hop rate control in named data networking (NDN). The proposed method suppresses the excessive reduction of Interest sending rate due to continuous negative acknowledgement (NACK) packets caused by the propagation delay. The proposed method limits the rate reduction to once per congestion. The point of our method is not to change...
One of the major challenges for the deployment of underwater acoustic sensor networks is the development of a medium access control (MAC) protocol catering for the harsh underwater environment. In particular, an underwater MAC protocol should provide high end-to-end throughput, low channel access delay, and fair share of the scarce network bandwidth. In this paper, a cross-layer MAC protocol is proposed...
In this paper, we first investigate how a network works when multiple receivers download content simultaneously in content-centric networking (CCN). We are especially interested in the case that the receivers' downloading speeds differ. From our investigation, we show that the download completion time of a faster user degrades excessively due to the problem that there being different downloading speeds...
In this paper, we have proposed an extended version of MPTCP with heterogeneous communication links to solve the out-of-order packet problem. We have confirmed that the proposed method can improve the end-to-end throughput performance up to 72.7% when RTTs of subflows are different. In addition, we have also confirmed that the proposed method does not affect the end-to-end throughput performance in...
In this paper, we propose a quality of experience (QoE) aware quality-level switching algorithm for adaptive video streaming. The proposed algorithm is a quality- level switching algorithm which works on the controller of dynamic adaptive streaming over HTTP (DASH) system. The proposed algorithm has two features: insertion of intermediate quality level and limitation of quality-level switching. The...
In this paper, we propose a location-based service (SmartLocService) using space dependent information. The space dependent information is defined as the unique information for a specific place such as set of service set identifier (SSID) from Wireless LAN (WLAN) access points (APs). Existing location-based services (LBSs) mainly use Global Positioning System (GPS) to identify a place. However, GPS...
Recently, a novel full-duplex wireless technology attracts attention in wireless research field. Full-duplex wireless enables transmission and reception simultaneously in a single channel [1]. Intuitively, the full-duplex wireless has a great potential to achieve throughput improvement comparing to the conventional half-duplex wireless. However, since existing medium access control (MAC) protocols...
In this paper, we propose a routing protocol for directional full-duplex wireless (D-FDW) to reduce hidden terminal problems in multi-hop networks. The proposed routing protocol is an on-demand detour routing protocol, which reduces number of cross points among traffic flows. In general, the throughput of a detour route degrades excessively due to increase of the number of hops between source and...
Wireless full-duplexing enables a transmission and a reception on the same frequency channel at the same time, and has the potential to improve the end-to-end throughput of wireless multi-hop networks. In the present paper, we propose a media access control (MAC) protocol for wireless full- duplex and multi-hop networks called Relay Full- Duplex MAC (RFD-MAC). The RFD-MAC is an asynchronous full-duplex...
In this paper, we propose a novel node architecture introducing directional antennas into full duplex wireless (FDW) technology. In the proposed architecture, each element of switched-beam antenna is connected to a software switch for directional antenna selection. A node needs only one set of digital and analog cancellation circuits, which is almost the same circuit scale and complexity of the conventional...
Multi-view video consists of multiple video sequences captured simultaneously by multiple closely spaced cameras from different angles. It allows the users to change their viewpoints by playing different video sequence. However, the transmission of multi-view video is much larger than conventional media and increases with increasing number of views, which brings much more increment in the bandwidth...
In this paper, we propose a medium access control (MAC) protocol for improving throughput in full-duplex WLANs. The proposed MAC protocol introduces a dynamic contention window (CW) control at access point (AP) to increase the opportunity for full- duplex operations. In the proposed MAC protocol, a threshold is set in the transmission queue length in APs. Small and large CWs are used adaptively. When...
Opportunistic spectrum access (OSA) is a suitable approach to increase spectrum efficiency for the current spectrum management. This paper considers the secondary user (SU) multi-rate multi-hop impact under the temporal dynamic aspect of OSA. Firstly, we investigate the SU multi-rate transmission and number of hops impact under the temporal dynamic aspect of OSA. The observed metrics include both...
Energy harvesting has been studied as a candidate for powering next generation wireless sensor networks. The technologies that can harvest electric power from ambient energy sources include solar, vibration, heat and wind. However, sensor nodes powered by energy harvesting devices cannot always communicate with other nodes because the energy harvesting devices cannot provide a stable supply power...
Opportunistic spectrum access (OSA) is a suitable approach to increase spectrum efficiency for the current spectrum management. This paper considers the temporal aspect of 802.11-based OSA scenario. Firstly, we investigate the secondary users (SU) multi-rate transmission and number of hops effects to the SU performance when exploiting primary users (PU) idle duration. Numerical analysis and simulation...
The traffic of multi-view video is several times larger than traditional multimedia, which brings much more increment in the bandwidth requirement. To overcome this problem, Simulcast and MVC (Multi-view Video Coding) can be used to decrease the traffic for multi-view video. However, although Simulcast removes redundant information within each view, it still contains a large amount of inter-view redundant...
Multi-view video allows user to watch 3D video and select desired viewpoint. In order to reduce the switching delay, many researches tend to transmit all the views, which brings much more increment in the bandwidth requirement. And the traffic increase as the increase of the number of the views in the multi-view video. In order to overcome these problems, we have proposed a user dependent scheme called...
Due to the Recent development in wireless technology, wireless sensor networks attract researchers' attention because of their applicability in many fields for effective collection of sensing data with low cost. Wireless sensor networks have many applications; some of the applications are military application, environmental application and flood detection. For example, in an environmental application...
In this paper, we propose a multi-lobe directional transmission for network coding in multi-rate ad hoc networks to improve throughput performance of XOR-based WNC. The proposed scheme uses directional antennas that can make antenna beam forms with multiple main lobes. In the proposed scheme, a node transmits uncoded packets with a beam form of one or multiple main lobes for realizing high-rate unicast...
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