Taihyong Yim

Mobile flow-aware networks for mobility and QoS support in the IP-based wireless networks

Abstract As the volume of mobile traffic consisting of video, voice, and data is rapidly expanding, a challenge remains with the mobile transport network, which must deliver data traffic to mobile devices without degrading the service quality. Since every Internet service holds its own service quality requirements, the flow-aware traffic management in fine granularity has been widely investigated to guarantee Quality of Service (QoS) in the IP networks. However, the mobile flow-aware management has not been sufficiently developed yet because of the inherent constraints of flow routing in the mobile networks regarding flow-aware mobility and QoS support. In this paper, we propose a flow-aware mobility and QoS support scheme called mobile flow-aware network (MFAN) for IP-based wireless mobile networks. The proposed scheme consists of dynamic handoff mechanisms based on QoS requirements per flow to reduce the processing overhead of the flow router while ensuring QoS guarantee to mobile flows. The performance analyses of the proposed scheme demonstrate that MFAN successfully supports the mobile flow traffic delivery while satisfying the QoS requirement of flows in the wireless mobile IP networks.

A mobility-aware flow admission control scheme in OpenFlow-based mobile networks

This paper proposes a mobility-aware flow admission control scheme in OpenFlow based mobile networks. Proposed scheme performs classification of the input messages at the control plane considering mobility and types of services. Then, different amount of capacities are allocated according to the class for prioritized admission control. Proposed scheme is evaluated in terms of blocking probability and average waiting time in the control plane. The analytical results demonstrate that proposed scheme has both lower blocking probability and average waiting time for high prioritized messages.

Dynamic downlink and uplink subframe boundary adjustment for capacity improvement and QoS support in mobile WiMAX

Mobile WiMAX is a promising broadband access technology providing wireless last mile connectivity. In the Time Division Duplex (TDD) mode, a WiMAX frame is divided into two parts: downlink and uplink subframes. The subframe division ratio is normally set to a fixed value, resulting in under-utilization of the downlink or uplink subframes. In this paper, we propose a dynamic downlink and uplink subframe boundary adjustment scheme in which the downlink and uplink subframe ratio is dynamically adjusted upon the usage statistics. It consequently improves the frame utilization efficiency, system capacity as well as QoS support.

Mobile flow-aware management for mobility and QoS support in mobile networks

Mobility is the most important feature of a mobile communication system. Moreover, as the volume of mobile traffic consisting of video, voice, and data is rapidly expanding, the challenge rests with the mobile transport network which must deliver the data traffic to mobile devices without degrading the service quality. In this paper we proposed a flow-aware QoS and mobility management scheme for IP-based mobile wireless network. The proposed scheme consists of dynamic handoff mechanisms based on QoS requirements per flow, which is to reduce the processing overhead of the flow router while ensuring QoS guarantee to mobile flows. The performance analyses demonstrated that the proposed scheme successfully supports the mobile flow traffic delivery satisfying the QoS requirement of flows in the wireless mobile IP networks.