• Title/Summary/Keyword: inter-node communication

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An Efficient Scheduling Scheme for Bluetooth Scatternets Based on the Sniff Mode (스니프 모드 기반의 효율적인 블루투스 스캐터넷 스케줄링 기법)

  • Lee, Woo-Sin;Lee, Hyuk-Joon
    • The KIPS Transactions:PartC
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    • v.10C no.2
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    • pp.185-190
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    • 2003
  • Bluetooth communication is based on piconet, which is composed by one master and maximum seven slaves. Several piconets can be interconnected via an inter-piconet Bluetooth unit called a bridge unit to form a Bluetooth scatternet. This bridge node can make its presence in each piconet by switching. This switching must be carefully scheduled so that slot wastage and, hence, packet delays are minimized. In this paper, we introduce an efficient inter-piconet scheduling scheme based on sniff mode. This scheme tries to minimize the wastage of slots by having the bridge unit sniff with its peering masters with time limits and communicate with its slaves in remaining slots. The sniff time limits are determined adaptively based on the amount of traffic in each piconet. Simulation results show this scheme outperforms round-robin scheme based on sniff intervals of equal lengths.

Performance Analysis on Code-Division Multiple Access in Underwater Acoustic Sensor Network (수중 음향 센서 망에서의 코드 분할 다중 접속 기법에 대한 성능 해석)

  • Seo, Bo-Min;Cho, Ho-Shin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.9A
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    • pp.874-881
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    • 2010
  • Acoustic signal, which is a main carrier of underwater communication, attenuates along the traveled path heavily depending on the frequency as well as inter-node distance. In addition, since it has a long propagation delay, the conventional medium access control (MAC) schemes requiring complex signaling procedures and accordingly heavy overhead messages would not be appropriate in underwater communications. In this paper, we propose a code division multiple access (CDMA) scheme as a solution for MAC of underwater communication and evaluate the performance. A hierarchical data-gathering tree topology is considered and a staggered wake-up pattern is employed for the purpose of energy saving. As a performance measure, the data rate at each level of hierarchical topology is derived.

A Hierarchical Multicast Routing Protocol based on Zone Routing Technique for Wireless multi-hop Network (무선 다중 홉 네트워크에서의 지역 기반의 계층적 멀티캐스트 라우팅 프로토콜)

  • Gui, Yi-Qi;Zhang, Jie;Yang, Dong-Il
    • Journal of the Korea Society of Computer and Information
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    • v.16 no.3
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    • pp.149-156
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    • 2011
  • In wireless multi-hop network, many applications need multicast communication where the group leader needs to send data to all members of the group. Multicast routing provides a balanced, efficient, and fairness network environment for the group members. However, large load for transmission management to leader node and signal interference between several paths for multi-hop links always took long transmission delay and low throughput efficiency. In this paper, we propose a Zone-based Hierarchical Multicast Routing Protocol (ZHMP). This routing protocol is designed based on zone routing schemes, where proactive routing is applied for intra-zone node level multicasting and reactive routing is used for searching inter-zone paths. By each hierarchical and independent multicast working in separated zones, load of multicast source node will be distributed by several zone-level routings for a better load balance and signal interference between each multi-hop paths will be resisted for a maximum multicast throughput.

Conceptual Design of Networking Node with Real-time Monitoring for QoS Coordination of Tactical-Mesh Traffic (전술메쉬 트래픽 QoS 조율을 위한 네트워킹 노드의 개념 설계 및 실시간 모니터링)

  • Shin, Jun-Sik;Kang, Moonjoong;Park, Juman;Kwon, Daehoon;Kim, JongWon
    • Smart Media Journal
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    • v.8 no.2
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    • pp.29-38
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    • 2019
  • With the advancement of information and communication technology, tactical networks are continuously being converted to All-IP future tactical networks that integrate all application services based on Internet protocol. Futuristic tactical mesh network is built with tactical WAN (wide area network) nodes that are inter-connected by a mesh structure. In order to guarantee QoS (quality of service) of application services, tactical service mesh (TSM) is suggested as an intermediate layer between infrastructure and application layers for futuristic tactical mesh network. The tactical service mesh requires dynamic QoS monitoring and control for intelligent QoS coordination. However, legacy networking nodes used for existing tactical networks are difficult to support these functionality due to inflexible monitoring support. In order to resolve such matter, we propose a tactical mesh WAN node as a hardware/software co-designed networking node in this paper. The tactical mesh WAN node is conceptually designed to have multi-access networking interfaces and virtualized networking switches by leveraging the DANOS whitebox server/switch. In addition, we explain how to apply eBPF-based traffic monitoring to the tactical mesh WAN node and verify the traffic monitoring feasibility for supporting QoS coordination of tactical-mesh traffic.

An Energy-Efficient Clustering Protocol Based on The Cross-Layer Design in Wireless Sensor Networks (무선 센서 네트워크에서 크로스 레이어 기반의 에너지 효율적인 클러스터링 프로토콜)

  • Kim, Tae-Kon;Lee, Hyung-Keun
    • Journal of IKEEE
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    • v.11 no.4
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    • pp.165-170
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    • 2007
  • The main goal of research concerning clustering protocols is to minimize the energy consumption of each node and maximize the network lifetime of wireless sensor networks. However, most existing clustering protocols mainly focused on the design and formation of clusters, leaving the consideration of communication between the cluster head and the sink behind. In this paper, we propose efficient multi path routing algorithm by using MAC-NET Cross-layering. multi path needed only one tiny packet from sink to setup. In addition proposed algorithm can be used for any cluster-based hierarchical inter-clustering routing algorithm. The simulation results demonstrate that proposed algorithm extended the overall survival time of the network by reducing the load of cluster heads. The performance of proposed algorithm is less affected by the extension of sensing field than other inter-clustering operation.

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Forward Migration of an Active Rule Mobile Agent using the Meta_data (메타데이터를 이용한 능동규칙 이동에이전트의 정 방향 이주)

  • Lee, Yon-Sik;Lee, Jun-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.7
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    • pp.1567-1574
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    • 2012
  • Since a migration method of the mobile agent is a factor that affects the overall performance of the entire distributed system, it is necessary to find efficient migration methods of the mobile agent within the sensor network and to collect and store data related to various components(server, sink and sensor node) of the sensor network, thereby providing consistent naming services. Accordingly, this paper presents design and implementation of MetaTable that is divided into MetaData where information on the sensor data server is stored and SubMetaData where various types of information on sink nodes and data on sensor nodes connected with the sink nodes is stored. Moreover, the paper also presented the implementation of forward migration of an active rule mobile agent applying the naming method based on RMI that used the meta_table and proposed the possibility of constructing efficient sensor network application environment. In this paper, for registration, release and retrieval methods suitable for new sensor network environment, we designed and implemented the naming agent by applying J2EE model based on RMI-IIOP(Internet Inter-ORB Protocol) technique.

A Design of a Register Insertion Backbone Ring Network (레이스터 인서션 Backbone 링 네트워크에 관한 연구)

  • 강철신
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.17 no.8
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    • pp.796-804
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    • 1992
  • This paper presents a design of a backbone network which uses a rigister-Insertion ring structure, The introduction of a high speed register in sertton backbone ring enables high performance inter-network 4ommunicatlons In a simple and modular structure at low cost and Its concurrent communications.. Two or more bridge nodes can be used to construct a register Insertion backbone ring network. The high bandwidth of the backbone ring sup ports heavy traffic for Inter-segment Eornrnunicatlons. The bridge node does both local address filtering to block data entering the ring and remote address filtering to block data entering the local LAN segment . Title local address greatly reduces the rate on the backbone ring and the remote address filterlng greatly reduces the traffic rate on each LAN segment. An feature makes the network the network reconflguratlon simpler and transparent to users. A throughput analysis Is used to deterrune the bandwidth of the backbone rlr)g transmission medium.

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The traffic performance evaluation between remote server and mobile for applying to encryption protocol in the Wellness environment (웰니스 환경에서 암호화 프로토콜 적용을 위한 모바일과 원격 서버간 트래픽 성능 평가)

  • Lee, Jae-Pil;Kim, Young-Hyuk;Lee, Jae-Kwang
    • Journal of Digital Convergence
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    • v.11 no.11
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    • pp.415-420
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    • 2013
  • U-WHS refers to a means of remote health monitoring service to combine fitness with wellbing. U-WHS is a system which can measure and manage biometric information of patients without any limitation on time and space. In this paper, we performed in order to look into the influence that the encryption module influences on the communication evaluation in the biometric information transmission gone to the smart mobile device and Hospital Information System.In the case of the U-WHS model, the client used the Objective-c programming language for software development of iOS Xcode environment and SEED and HIGHT encryption module was applied. In the case of HIS, the MySQL which is the Websocket API of the HTML5 and relational database management system for the client and inter-server communication was applied. Therefore, in WIFI communication environment, by using wireshark, data transfer rate of the biometric information, delay and loss rate was checked for the evaluation.

Design and Implementation of an InfiniBand System Interconnect for High-Performance Cluster Systems (고성능 클러스터 시스템을 위한 인피니밴드 시스템 연결망의 설계 및 구현)

  • Mo, Sang-Man;Park, Kyung;Kim, Sung-Nam;Kim, Myung-Jun;Im, Ki-Wook
    • The KIPS Transactions:PartA
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    • v.10A no.4
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    • pp.389-396
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    • 2003
  • InfiniBand technology is being accepted as the future system interconnect to serve as the high-end enterprise fabric for cluster computing. This paper presents the design and implementation of the InfiniBand system interconnect, focusing on an InfiniBand host channel adapter (HCA) based on dual ARM9 processor cores The HCA is an SoC tailed KinCA which connects a host node onto the InfiniBand network both in hardware and in software. Since the ARM9 processor core does not provide necessary features for multiprocessor configuration, novel inter-processor communication and interrupt mechanisms between the two processors were designed and embedded within the KinCA chip. Kinch was fabricated as a 564-pin enhanced BGA (Bail Grid Array) device using 0.18${\mu}{\textrm}{m}$ CMOS technology Mounted on host nodes, it provides 10 Gbps outbound and inbound channels for transmit and receive, respectively, resulting in a high-performance cluster system.

A Design on The Zone Master Platform based on IIoT communication for Smart Factory Digital Twin (스마트 팩토리 디지털 트윈(Digital Twin)을 위한 IIoT 통신 기반 ZMP(Zone Master Platform) 설계)

  • Park, Seon-Hui;Bae, Jong-Hwan
    • Journal of Internet of Things and Convergence
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    • v.6 no.4
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    • pp.81-87
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    • 2020
  • This paper creates a standard node for acquiring sensor data from various industrial sensors (IoT/non-IoT) for the establishment of Smart Factory Digital Twin, and provides inter-compatible data by linking zones by group/process to secure data stability and to ensure the digital twin (Digital Twin) of Smart Factory. The process of the Zone Master platform contains interface specifications to define sensor objects and how sensor interactions between independent systems are performed and carries out individual policies for unique data exchange rules. The interface for execution control of the Zone Master Platform processor provides system management, declaration management for public-subscribe, object management for registering and communicating status information of sensor objects, ownership management for property ownership sharing, time management for data synchronization, and data distribution management for Route information on data exchange.