| 1. |
- Hagsand, Olof, et al.
(författare)
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Self-admission control for ip telephony using early quality estimation
- 2004. - 1
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Ingår i: NETWORKING 2004, Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communications (Third International IFIP-TC6 Networking Conference, Athens, Greece, May 9-14, 2004. Proceedings). - Berlin, Heidelberg : Springer. - 9783540219590 ; , s. 381-391
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Bokkapitel (refereegranskat)abstract
- If quality of service could be provided at the transport or the application layer, then it might be deployed simply by software upgrades, instead of requiring a complete upgrade of the network infrastructure. In this paper, we propose a self-admission control scheme that does not require any network support or external monitoring schemes. We apply the admission control scheme to IP telephony as it is an important application benefiting from admission control. We predict the quality of the call by observing the packet loss over a short initial period using an in-band probing mechanism. The quality prediction is then used by the application to continue or to abort the call. Using over 9500 global IP telephony measurements, we show that it is possible to accurately predict the quality of a call. Early rejection of sessions has the advantage of saving valuable network resources plus not disturbing the on-going calls.
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| 2. |
- Kihl, Maria, et al.
(författare)
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Control theoretic modelling and design of admission control mechanisms for server systems
- 2004
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Ingår i: NETWORKING 2004, Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communications / Lecture Notes in Computer Science. - 1611-3349 .- 0302-9743. - 9783540219590 ; 3042, s. 1366-1371
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Konferensbidrag (refereegranskat)abstract
- The admission control mechanism is an important part of many communication systems. In this paper we investigate load control mechanisms for server systems, that is systems that may be modelled as queueing systems. We show how control theory can be used when designing controllers for a G/G/1-system. We design a PI-controller for the system and compare the steady-state and transient behavior of this controller with the behavior of a static controller.
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| 3. |
- Zander, Roland, et al.
(författare)
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A layer assignment and resource reservation scheme for hierarchical cell structures
- 2004
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Ingår i: NETWORKING 2004, Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communications. Proceedings (Lecture Notes in Computer Science). - Berlin, Heidelberg : Springer Berlin Heidelberg. - 1611-3349 .- 0302-9743. - 9783540219590 ; 3042, s. 1508-1513
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Konferensbidrag (refereegranskat)abstract
- To provide for a high QoS in a cellular network, each call should be assigned to its preferred cell and priority given to already ongoing calls. Herein, a combined speed-sensitive layer selection method and dynamic guard channel scheme, called CLARR, for use in hierarchical networks, is introduced. To reduce the complexity, partially the same speed estimation and measurement procedures are applied for both tasks. The main features of CLARR are the use of dwell time feedback control in the layer selection method and the grouping of calls depending on previous movement patterns. The measurements needed for making mobility predictions are performed separately for calls of different groups.
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