An Evaluation of a Local Approach for VPC Capacity Management

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Sven-Olof Larsson
Title: An Evaluation of a Local Approach for VPC Capacity Management
Translated title: En utvärdering av en lokal metod för VPC kapacitetshantering
Conference name: COST 257 meeting
Year: 1998
Pagination: paper no TD257(98)17
City: Rome
Organization: Blekinge Institute of Technology
Department: Dept. of Telecommunications and Mathematics (Institutionen för telekommunikation och matematik)
Dept. of Telecommunications and Mathematics S-371 79 Karlskrona
+46 455 780 00
http://www.hk-r.se/itm/index.html
Authors e-mail: sveo@itm.hk-r.se
Language: English
Abstract: By reserving transmission capacity on a series of links from one node
to another, making a virtual path connection (VPC) between these nodes,
several benefits are obtained. VPCs will simplify routing at transit
nodes, connection admission control, and QoS management by traffic
segregation. As telecommunications traffics experience variations in
the number of calls per time unit due to office hours, inaccurate
forecasting, quick changes in traffic loads, and changes in the types
of traffic (as in introduction of new services), there is a need to
cope for this by adaptive capacity reallocation between different VPCs.
We have developed a type of local VPC capacity management policy that
uses an allocation function to determine the needed capacity for the
coming updating interval, based on the current number of active
connections but independently of the offered traffic. We determine its
optimal parameters, and the optimal updating interval for different
overhead costs. Our policy is shown to be able to combine benefits from
both VP and VC routing by fast capacity reallocations. The method of
signaling is easy to implement and our evaluations indicate that the
method is robust. This paper is based on our earlier work, described in
[19]. The calculations are simplified and the methodology is changed.
Summary in Swedish: För att utnyttja ett tele/datornäts kapacitet på bästa möjliga sätt och samtidigt garantera kvalitet på överföringen av data, reserveras kapacitet på nätet med sk logiska länkar (VP=Virtual Paths). Tidigare arbeten har fokuserats på att en central dator gör detta jobb. Denna publikation utvärderar en "lokal" metod, där varje växel använder information som redan finns där. Metoden använder antalet pågående uppkopplingar för att räkna ut hur mycket kapacitet som varje VP från denna nod behöver under kommande uppdateringsintervall. Vi optimerar allokeringsfunktionen map overhead-kostnader och uppdateringsintervall. Metoden drar fördelar av både VP- och VC-vägval genom nätet.
Subject: Telecommunications\VP and VC Assignment and Routing
Keywords: ATM, VP Management, Local Approach
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