123effective guarantees on quality of service. In the process of the development of QoS technology, the Internet Engineering Task Force (IETF) has explored several QoS architectures such as IntServ [1] and Diffserv [2], but none has been successfully and globally deployed. This is partly because these QoS architectures are built on top of a distributed hop-by-hop routing architecture without a global view. Instead of IP QoS and guarantees, overlay QoS for multimedia applications may provide some level of quality of service to improve the multimedia communication on the top of the best services[3][4][5][6][7]. By using fast label switching, Multi-Protocol Label Switching (MPLS) [8] provides a reliable solution to improve QoS performance. However, it is configured statically without real-time reconfiguration ability and adaptability [19].Current QoS solutions, such as IntServ, may cost too much, or cannot provide an end to end QoS guarantee (e.g. DiffServ), or provides only soft and less efficient QoS such as application layer QoS. Software Defined Networking (SDN) [9] provides a possible way to solve these problems and paves the way for new QoS frameworks. SDN is a new approach for computer networking to manage network services with a global view and real time programmability through abstraction of lower level functionality. It separates the control plane and the forwarding plane of the traditional Abstract: Today's Internet architecture provides only "best effort" services, thus it cannot guarantee quality of service (QoS) for applications. Software Defined Network (SDN) is a new approach to computer networking that separates control plane and forwarding planes, and has the advantage of centralized control and programmability. In this paper, we propose HiQoS that provides QoS guarantees using SDN. Moreover, HiQoS makes use of multiple paths between source and destination and queuing mechanisms to guarantee QoS for different types of traffic. Experimental results show that our HiQoS scheme can reduce delay and increase throughput to guarantee QoS. Very importantly, HiQoS recovers from link failure very quickly by rerouting traffic from failed path to other available path.

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