Best Paper! – Social Benchmarking of QoS & QoE in Cellular Data Networks by Hirochika Asai, Kensuke Fukuda and Hiroshi Esaki
Abstract – We developed a benchmarking tool called NetBench to measure the quality of service (QoS) and quality of experience (QoE) in cellular data networks and to share them among users of the tool. This tool has a user interface that displays the summarized QoS and QoE on a map to motivate users to share their QoS and QoE. We have been continuously collecting QoS related metrics and a QoE related metric from this tool. We characterize the QoS and QoE of three cellular data network carriers (one is a CDMA2000 operator and the others are UMTS/WCDMA operators supporting HSDPA/HSUPA) in Japan from the collected data for eight months. We demonstrate that round trip time (RTT) among other QoS related metrics such as signal strength and packet loss rate is one of the metrics that explains the performance of TCP throughput. We also demonstrate that the packet loss rate and RTT of the QoS related metrics affects the QoE. These overall results of QoS and QoE indicate that the characteristics of QoE is explained by QoS, especially by RTT.
Best Paper! – Query Guidance with Transmission Records for Efficient Content Searching in Unstructured Peer-to-Peer Networks by Takuya Tomimatsu, Shinji Sugawara and Yutaka Ishibashi
Abstract – Recently, a lot of content searching methods applied to Peer-to-Peer (P2P) networks have been researched, in which the peers accomplish their duties evenly and autonomously. However, especially in unstructured P2P networks, the amount of traffic grows when a flooding-based content searching method is adopted because of no contents indexing capability. Accordingly, in this paper, for unstructured P2P networks, we propose an efficient content searching method in which content searching queries are guided properly only to the proven peers by using query transmission records kept in each peer. Consequently, the number of wasted queries can be reduced. In addition, we discuss the availability of the proposal by using computer simulations.
Contribution of Olfactory, Haptic, and Auditory Senses to Sense of Presence in Virtual Environments by Yoshihiro Maeda, Yutaka Ishibashi, Norishege Fukushima and Shinji Sugawara
Abstract — In this paper, we assess the sense of presence for remote ikebana (Japanese ﬂower arrangement) with olfactory and haptic senses and a fruit harvesting game with olfactory, haptic, and auditory senses by switching whether the olfactory, haptic, and/or auditory senses are employed or not. In the assessment, we used the Semantic Differential (SD) technique and the rating scale method. By carrying out the factor analysis for results of the SD technique, three factors were extracted. We also investigated the relation between the three factors and scores of the rating scale method by the multiple regression analysis. As a result, we illustrated that the contribution degrees of olfactory, haptic, and auditory senses to the sense of presence are almost the same.
A Method of Per-Node Priority Assignment for Live Streaming Flows by Yuuhei Hayashi and Katsunori Yamoaka
Abstract – Per-node priority assignment to live streaming flows can increase the number of flows able to arrive at a destination node within the allowable delay of the flow (delay-satisfied flows) in a network whose communication resources are limited. This work first introduces end-to-end delay distribution of streaming flow packets accommodated in a network constructed of priority control nodes. It then defines the delay allowance for each flow, meaning the difference between the allowable delay of the flow and an α percentile value of the end-to-end delay probability distribution of packets in the flow. A per-node priority assignment method for flows is proposed to increase the number of flows whose delay allowances are not under zero (satisfied flows in terms of delay). The method’s effectiveness is confirmed by numerical analysis showing that it can find near optimal solutions.
Coder Rate-Distortion Analysis Using Perceptual Distortion Measures by Julio Cesar Garcia Alvarez
Abstract — This work illustrates the variation of the Rate Distortion (RD) function, when the coder evaluation uses perceptual Image Quality Assessment (IQA). This study gives the evaluation of JPEG and JPEG2000 coders, under different perceptual measurements. Study provides relevant results on the optimal Rate of such RD–curves, including human– based Mean Observed Scores, based on a standardized image database.
Hybrid TDMA and Contention-based Access Techniques in Ethernet Passive Optical Networks for Smart Sensor-Actuator Networks by Masashi Tadokoro, Takahiro Kubo, Daisuke Murayama, Takashi Yamada, Ken-Ichi Suzuki, Naoto Yoshimoto, and Ryogo Kubo
Abstract — Emerging Internet applications require diversified quality-of-service (QoS). For example, future smart sensor-actuator networks such as smart grids may require ultra-low latency in networked sensing and control even at the expense of a few information losses. This paper proposes hybrid access techniques for Ethernet passive optical networks (EPONs) designed to reduce the average upstream queuing delay caused by multipoint MAC control (MPMC). The proposed techniques combine existing TDMA and novel contention-based access schemes, which utilize a dynamic bandwidth allocation (DBA)-based contention-free access period (CFP) and a contention access period (CAP). During the CAP, an optical network unit (ONU) can send upstream data without exchanging multi-point control protocol (MPCP) messages. The proposed techniques are validated by a numerical analysis.
Multicast Priority Control for Multimedia Transmission on Wireless LAN Systems by Toshiyuki Ogawa, Takefumi Hiraguri, Hideaki Yoshino and Kenya Jin’no
Abstract — This paper proposes an access control protocol method that maintains the communication quality of various multimedia applications, including video delivery, using multicast transmission in wireless local area network (WLAN) systems. A multicast transmission may deliver simultaneously to multiple mobile stations (STAs) during single transmissions. However, its communication quality will be significantly degraded by packet collisions and interference waves, since the multicast transmission procedure is of the broadcast traffic type, and does not perform retransmission. The enhanced distributed control access (EDCA) method for priority control defined in IEEE 802.11e guarantees the communication quality of various applications. However, multicast applications are not supported. The proposed method resolves these issues. Its advantages are confirmed by computer simulation. The packet loss of multicast is improved by about 20% and a high multicast throughput is achieved as compared to that of conventional methods. Moreover, the proposed method improves the communication quality not only of multicast transmissions but also of other applications.
Evaluation on QoS Characteristics of Wireless Link Aggregation with Cooperative Moving Multi-Robots by Yuto Noda, Tutomu Murase and Kazuyuki Sasajima
Abstract — In this paper, we use communication method, called aggregation, for movable nodes, and evaluate an effect of aggregation. Each node can have two connections. One is WLAN for communication between two nodes, and the other is 3G for communication between node and somewhere far from nodes. By using this method, if one node thought to want to notice much information for somewhere, the node could transfer much information by using other nodes’ 3G wireless. In addition, if nodes approached each other, the bandwidth would become wider than before approaching. The remarkable point of our research is to evaluate the moving of the nodes, and be able to select optimal moving against given object function and constraints. We suppose this system can be apply for multi-robot system. Each node can see as robot which has two connection, which is WLAN and 3G. For example, it applies for the research of an area of mine by using some robots. If we apply this communication method for multi-robots investigation, we will be able to get detail data of the situation of the area (e.g. high quality video) in real time.
Robustness Improvement in a Mobile Ad Hoc Network Using Reputation-Based Routing by Arnab Das and Santanu Das
Abstract — A Mobile Ad Hoc Network (MANET) is considered where an intermediate relay node may engage in discreet packet-dropping practices for selﬁsh (e.g., to conserve power) or other reasons. It is assumed that each node in such a MANET has a dynamic reputation level known to all other nodes. These reputation levels are assumed to be updated continuously and are propagated throughout the network using a known mechanism. In this contribution, we propose a novel scheme for improving the overall performance or robustness of such a MANET by adopting a routing strategy which considers the reputation levels of intermediate relaying nodes in determining the best route from a source to a destination. For deciding the best route, we propose the use of mechanisms based on the modiﬁcation of the Ad Hoc On-Demand Distance Vector (AODV) routing protocol. As opposed to the AODV scheme, which uses a broadcast mechanism for route discovery, the proposed scheme considers the reputation levels of neighboring nodes to determine the node(s) to which the route discovery packet should be sent. From a simulation model of our modiﬁed AODV scheme, which we call Robust AODV(RAODV), it is observed that this scheme is as effective in route discovery performance as the regular AODV, while substantially improving packet transfer performance in a MANET.