Applications supporting various multimedia data in wireless multimedia sensor networks (WMSNs) have specific QoS requirements on bandwidth, delay, and/or packet loss. Perception of applications' QoS requirements and detection of link states are indispensable for the design of QoS-aware routing mechanism. Software defined networking (SDN) is suitable for the purpose since it provides visibility of network resources and programmable interfaces. OpenFlow is the most recognized realization of SDN. We propose a QoS-aware routing mechanism for OpenFlow-enabled WMSNs. The mechanism consists of a framework and routing algorithms on SDN controller. The framework includes two functions: detection of link states among OpenFlow-enabled nodes and determination of flow's QoS requirements. The routing algorithms are achieved in two steps. First, the SDN controller seeks the feasible paths that satisfy QoS requirements of a flow. If there is no path which satisfies the required QoS, the path will be decided by the proposed algorithms depending on flow types: delay-sensitive, bandwidth-sensitive, and best-effort traffic. We conducted experiments on a SDN testbed to evaluate our mechanism and compared the results with conventional routing protocols. The results show that proposed routing mechanism increases the throughput by 43% for video data and reduces the delay by more than 30% for audio data.

No abstract

We designed a specific router which can provide the required level of QoS over NGN(Next Generation Network) in this paper. We called this router 'QoSAware router', which consists of two parts, a classbased routing part and a flow-based routing part. QoS-Aware router enables data taking broad bandwidth or requiring high-level QoS to be processed immediately and not to be affected by other services. We assigned new service types to the flow label field of IPv6 header so as to provide differentiated services according to the packet type. Also, we adopted NGN QoS Architecture to apply resource management and to get user's information. By doing this, we designed a distinguishing mechanism in order to adapt to NGN that concentrates upon QoS. We built a simulation model using OMNeT++, and could verify the performance of QoS-Aware router supporting QoS based on subscriber and service levels, and resource management.

SUMMARYFor IP-based mobile networks, efficient mobility management is vital to provision seamless online service. IP address starvation and scalability issue constrain the wide deployment of existing mobility schemes, such as Mobile IP, Proxy Mobile IP, and their derivations. Most of the studies focus on the scenario of mobility among public networks. However, most of current networks, such as home networks, sensor networks, and enterprise networks, are deployed with private networks hard to apply mobility solutions. With the rapid development, Software Defined Networking (SDN) offers the opportunity of innovation to support mobility in private network schemes. In this paper, a novel mobility management scheme is presented to support mobile node moving from public network to private network in a seamless handover procedure. The centralized control manner and flexible flow management in SDN are utilized to provide network-based mobility support with better QoS guarantee. Benefiting from SDN/OpenFlow technology, complex handover process is simplified with fewer message exchanges. Furthermore, handover efficiency can be improved in terms of delay and overhead reduction, scalability, and security. Analytical analysis and implementation results showed a better performance than mobile IP in terms of latency and throughput variation. key words: software defined networking (SDN), mobility management, private networks, network address port translation (NAPT)

As more applications of video and audio to be used more researches QoS measurement of multicast are being done nowadays. Even more experiments which are done at the international research network are more important than before. In this paper we use overlay multicast technology to construct a test-bed with overlay multicast relay (OMR) over international research network. We do multicast QoS experiments in the testbed with international research network and make analysis and comparison. Through these research works, we get different kind of performance evaluation of multicast in international research network. We propose QoS measurement method of multicast video service in the international research network.