A Parameter Injection Algorithm for Real-Time Traffic in 802.11 Open Access Networks

Abstract

Abstract-An Open Access Network (OAN) is characterized by the fact that private WLANs and broadband access lines are made available for public use, enabling bypassing mobile users to profit from continuous coverage. Our insight is that in wireless OANs, the overhead required for the launching or reconfiguration of a real-time session can be drastically reduced. We propose an algorithm which performs parameter injection into a multimedia data stream instead of following the classical negotiation path typically used. A solution to change the session characteristics of an application that adapts to varying network conditions was developed, including a QoS solution with SIP and MIP to optimize the session characteristics by taking into account the changed conditions in the network. With our approach, we achieve a reduction of a factor of 2.5 for session signaling delay, and excellent jitter values in the range of 10-15 milliseconds as our implementation results show.

Analysis and measurement of session setup delay and jitter in VoWLAN using composite metrics

“…The QoS ccess point assigns a new resource pair to the . Average Packet Size (APS) and Details concerning architecture, mathematical computations and implementation for airtime parameters are in [3,16].…”

“…We move on in the next sections to show how hybrid SIP-MIP mobility is used on a single stack with access point controllers brokering for airtime resources after every handover, and then measure the system performance. Assessing system performance in the case of SIP classical session negotiation over MIP, and then with parameter injection [3] using specialized limited signaling and more intensive computations, allows us to show a delta in performance. The key that enabled our quantitatively improved result is the architecture with proper placement of components, and specialized signaling that lead to lower session update delays and thus lower errors and shorter occupation of the airtime needed for VoWLAN session initiation or resumption.…”

“…ECS is designed to trigger immediate handover to the new foreign agent (FA) as soon as the mobile node (MN) receives an Agent Advertisement (ADV) message from that FA. is used on both cases of the experimental MIPdelta achieved in delay reduction and jitter bounding is due to improved signalling in the SIP part using the parameter injection algorithm presented in [3].…”

“…The setup delay time for a SIP-based session is a few seconds over a narrow-band rate. For WLAN (broadband), setup time can vary but would still be in the range of a 100 milliseconds as measurements show in [3].…”

Multimedia QoE optimized management using prediction and statistical learning

“…In previous work [1], [2] we explored the issue of autonomic resource management for media streaming via a technique called parameter injection. This was limited to the open access network (OAN) [3] paradigm and operated on media streams where trans-coding, codec selection, format change and stream width were adjusted based on a predictive technique and self-configuring behavior on the terminal that performs joint signaling with the network where media streams originate.…”