During the past few years, advances in mobile communication theory have enabled the development and deployment of different wireless technologies, complementary to each other. Hence, their integration can realize a unified wireless system that has the best features of the individual networks. Next-Generation Wireless Systems (NGWS) integrate different wireless systems, each of which is optimize...

In CDMA cellular networks, the soft handoff technique allows a mobile host to communicate with multiple base stations simultaneously, improving the transmission quality of the wireless channel and avoiding disconnection upon to base station switching. In this paper, we evaluate the influence of soft handoff on TCP (Transport Control Protocol) throughput in CDMA cellular networks through simulat...

With technological advances in the telecommunications sector, everyone around the world would like to be connected seamlessly anytime anywhere through the best network. Making a transition from one network to another and moving between heterogeneous networks is not the only problem that worried specialists, scientific and mobile operators; the concern of QoS is as important as the handoff, The ...

Low handoff latency and minimum packet loss are envisioned important factors for the next generation Mobile IPv6 (MIPv6) based heterogeneous networks. To meet these constraints IEEE 802.21-Media Independent Handover (MIH) was introduced to enhance the Quality of Service (QoS) of the networks. The MIH provides link layer information to the network layer to reduce handoff latency while the mobile...

Millimeter-wave (mmWave) communication has been considered as a promising communication system with large spectrum resource available. In mmWave communication systems, in order to overcome severe path-loss, beamforming technology is required to form narrow beam and generate high directional antenna gain. This will result in frequent beam handoff and severe link blockage, especially in mobile sc...

Providing seamless communication between heterogeneous networks persists to be a continuous challenge in a natural or a manmade disaster environment. Efficient Handoff decision schemes are required to improve Quality of service (Qos) and offer reliable communication. The handoff decision depends on many parameters such as Network Bandwidth, RSS, delay, packet loss, power dissipation and power c...

In 4G wireless networks, when a mobile host (MH) with multiple wireless interfaces changes its location or needs a network service, the MH will require a switch between different wireless networks (vertical handoff). Proposed congestion-aware proactive vertical handoff scheme uses coalition game. Its main objective is to decide source and target networks for handoff at minimum congestion in 4G ...

This paper presents the modeling and performance analysis in the integrated ad hoc and cellular network systems. In the modeling of the other integrated systems [7, 10, 12, 14, 17], the handoff area was not considered. However, for mobile communications, handoff area is important, complicated and unstable area that is the boundary of cells. In our system, handoff area and queue are taken into c...

Handoff is one of the most important factors that may degrade the performance of TCP connections in wireless data networks. In this paper, we present a lossless and duplication free handoff scheme called LPM (Last Packet Marking) for improving Cellular IP semisoft handoff. LPM signals the safe handoff cue by sending a specially marked packet to mobile hosts. With this control packet, MH can ada...

User mobility management is one of the important components of mobile multimedia environments. That is, mobile users should obtain network resources after handoff for seamless service supports. So, an adaptive handoff scheme has been proposed to minimize the connection dropping probability for handoff connections. This paper shows the comparative performance analysis for the adaptive QoS handof...