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SIP (Session Initiation Protocol) is standardized by Internet Engineering Task Force (IETF) as a signaling and control functionality for multimedia services (video and audio). However, SIP is a text-based protocol with messages usually exceeding several hundred bytes in size, thus causing high call set-up latency over low bit-rate links. As a consequence, SIP suffers from undesirable delay which is...
In this paper, we present the design and the implementation of a test-bed for the Policy and Charging Control (PCC) system proposed in 3GPP TS23.203. Specifically, we use an IP multimedia call service example to demonstrate how to implement an advanced mobile service with policy and charging control in our test-bed. We show that the PCC system can handle the application-level session information and...
TCP, the facto standard used in today's Internet, has been found to perform poorly in Mobile Ad Hoc Networks (MANETs). This is exacerbated by contention with increasing UDP-based high priority multimedia traffic and the class differentiation introduced in current QoS protocols, which results into TCP starvation and increased spurious timeouts. In this paper, we propose a cross-layer TCP enhancement...
As the next generation Internet (NGI) is coming, and with the rapid development and great research progress achieved, mobile Internet Protocol version 6 (MIPv6) based network has become a hotspot all over the world. Considering of the rapid growth of network service quality and data exchange requirement, we are going to propose a new data exchange method in this paper. This method uses resource reservation...
During the last years, several wireless Internet service providers (WISPs) install base stations (BSs) to public areas in order to offer Internet feed or voice services to their subscribers. These BSs use the licensed-exempt spectrum, and limited regulations apply during their deployment. Thus, WISPs offering services in overlapping geographical areas need interference-free, access resolution mechanisms...
As computers supplied in a homes, offices, and Internet use increases, various service based on the Internet are developed. In the future, many devices such as wireless PDA, Internet telephone, TV, refrigerator and oven will be connected on the Internet and the Internet address exhaustion problem is gradually raised. The present IPv4 address exhaustion problem is being solved through NAT (network...
Application-level protocol abstraction is required to support seamless mobility in next generation heterogeneous wireless networks. Session initiation protocol (SIP) provides such an abstraction in providing mobility support in such networks. However, the handoff procedure with SIP suffers from undesirable delay and hence packet loss for some cases, which is detrimental to applications such as voice...
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