AN ADAPTIVE BANDWIDTH RESERVATION SCHEME FOR HIGH-SPEED MULTIMEDIA WIRELESS NETWORKS

In the next generation high-speed wireless networks, it is important t o provide quality-of-service (QoS) guarantees as they are expected to support multimedia applications. This paper proposes an admission cont rol scheme based on adaptive bandwidth reservation to provide QoS guar antees for multimedia traffic carried in high-speed wireless cellular networks. The proposed scheme allocates bandwidth to a connection in t he cell where the connection request originates and reserves bandwidth in all neighboring cells. When a user moves to a new cell and a hando ff occurs, bandwidth is allocated in the new cell, bandwidth is reserv ed in the new cell's neighboring cells, and reserved bandwidth in more distant cells is released. The amount of bandwidth to reserve is dyna mically adjusted, reflecting the current network conditions, The perfo rmance of the proposed scheme is evaluated through simulations of real istic cellular environments. The simulated network consists of a large number of cells, mobile users with various movement patterns are assu med, and a variety of multimedia applications (e,g., audio phone, vide o conference, video on demand, file transfer, etc.) is considered. It is shown that the proposed scheme provides small handoff dropping prob ability (i,e,, the probability that handoff connections are dropped du e to a lack of bandwidth) and achieves high bandwidth utilization.