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It is expected that large number of IoT devices and IoT network will be connected to the Internet. In these environments, congestion of network links could be rapidly increased due to the bust IoT traffic especially related with video devices. To avoid the congestion, currently, End-devices control the congestion links by using congestion control scheme on TCP stack such as Tahoe, Reno, NewReno, and...
With the widespread of mobile devices has brought a huge change in the network environment. As the amount of mobile traffic grows, the efficient use of network resource becomes an important issue. Multipath TCP (MPTCP) has been standardized in Internet Engineering Task Force (IETF) to increase throughput and resilience of connectivity. MPTCP can be used in most networks because it is based on TCP,...
In Software-Defined Network environment, operator can see the global view of network. So it can be manage flows with network-wide view, but legacy flow classification method cannot satisfy the integrated tables of all switches because of out of memory and long compilation time. So I proposed the architecture that can control network-wide flow classification to satisfy one's policy like Quality-of-Service...
Transmission Opportunity (TXOP) which is specified in the IEEE 802.11e enables a Wi-Fi station to transmit multiple frames consecutively. In this paper, we propose an adaptive transmission scheme based on the Dynamic Aggregation and Fragmentation (DAF) algorithm. With real-time scheduling and adaptive TXOP allocation being the main focus of the suggested adaptive transmission scheme, optimum transmission...
Conventional network management was based on wired network, which is unsuitable for resource constrained devices. WSNs consist Internet of Things (IoT) can be large scale networks, and it is impossible to manage each node individually. In this paper, we propose a network management protocol for WSNs to reduce management traffic.
Machine-to-Machine(M2M) services are thriving enormously recently, considered as a key feature for upcoming era. However there are several problems for wider deployment, such as network management. Software-Defined Networking (SDN) is a possible solution for this by separating control and forwarding, which enables new kinds of network management. In this paper, we suggest an improved scheme for M2M...
As the services of Wireless Sensor Networks (WSNs), M2M and IoT are becoming more varied, reliable data transmission should basically be assured to support the required QoS specifications of sophisticated services in WSNs. However, the probability of collision is increased due to the crowded wireless frequency, WSNs have strict constraints on resources; therefore a more efficient way of delivering...
IoT (Internet of Things) network has recently emerged as a promising technology for various fields. To realize IoT service, access points are needed for heterogeneous terminals, sensors, actuators, laptop and mobile terminal. Wireless Mesh Network (WMN) could be a good solution. WMN consists of mesh points (MPs) that serve as a relay for other MPs for extension of network coverage. Reliable service...
Recently, requirement of ubiquitous availability and increase of mobile user driving traffic has become a serious problem. On the other hand, most mobile equipment have more than one network interface and a host can use multiple network interfaces simultaneously with multi-homing technology. Therefore, multiple paths are utilized for data transfer in one pair of terminals. This is a Con-current Multi-path...
Recently developments in the field of telecommuni-cations and network technology has been formed new paradigm shift in defense weapon system. The military also developing the Tactical Information Communication Network (TICN) system to meet the changing aspects of these wars. To equip its function from the battlefield, TICN system have to be received real-time information from the battlefield troop,...
Multicast is an efficient transport mechanism for group communications and to support a lot of applications that require mobile nodes work as a group several multicast mechanisms have been proposed. However, due to the mobility of nodes, many control messages are required for these protocols and then overlay data paths in overlay can remain static. In this paper, we propose a robust overlay multicast...
One of the method to improve performance of QoS is retransmission. For retransmission, one-way delay is essential because it should be known for correct retransmission. This paper proposes a one-way delay estimation scheme for efficient retransmission. In the proposed scheme, one-way delay is estimated by packet intervals. The simulation results demonstrate that estimated one-way delay is similar...
This paper proposes the path delay adaptive scheduling (PDAS) scheme which provides QoS guaranteed multicast transmission based on multicast tree topology adaptive scheduling. The PDAS scheme introduces the path delay information management technique and using the information, QoS guaranteed data transmission can be achieved regardless of asymmetric tree topology. The simulation result shows drastic...
The Femtocell becomes an effective solution to support indoor high data rate services. The macrocell systems require expensive costs to improve the performance of indoor users. Although the advantage of the femtocells, the co-channel interference between the femtocells and the macrocells is the most significant problem to deploy femtocells. In this paper, a novel downlink resource management algorithm...
A geographical forwarding algorithm is an attractive localized data forwarding scheme for wireless sensor networks (WSNs) due to its directional routing properties and scalability. Also, the inherent constraints of WSNs such as limited battery power and network resources require the simplicity and energy efficiency of protocols. In this paper, we propose a Time Backoff-based energy-efficient Geographical...
In this paper, we present research trends of communication protocols in wireless sensor networks (WSNs) focusing on application services' traffic condition features. We first outline the application services' traffic condition features and design challenges for communication protocols in WSNs. Focusing on these traffic condition features, synchronous and asynchronous MAC protocols, flat and hierarchical...
This paper proposes the world first complete voice call handover scheme between the 3G LTE and 3G CS systems. To achieve seamless handover, a powerful network entity called FW_MME is proposed. Features of the FW_MME contribute to reducing handover service interruption time; hence the resulting voice call handover performance is also improved. The evaluation result shows that the proposed FW_MME exclusively...
Network mobility (NEMO) supports the movement of some part of the network that a group of the mobile nodes (MNs) or the mobile routers (MRs) moves together. To support NEMO, the NEMO basic support protocol (NBSP) was proposed. In the nested mobile network, however, the NBSP exhibits pinball routing problem. As the degree of nesting increase, the problem becomes more serious. In this paper, we propose...
In wireless sensor networks, the simplified and energy efficient protocol should be designed in order to maximize the network lifetime because of its stringent resource constraints, ultra power limitation, and tiny embedded devices. In this paper, we propose an enhanced cross-layer protocol for energy efficiency in wireless sensor networks by integrating medium access control and routing protocol...
In wireless sensor networks, clustering, a method of grouping sensor nodes, has numerous advantages. It can support network scalability, reduce the size of the routing table stored at the individual node and prolong the battery life of the individual sensors and the network lifetime, etc. In this paper, to extend network lifetime and minimize additional overheads in energy limited sensor networks,...
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