We describe methods to guarantee a certain level of service for Internet traffic by reserving capacity along fixed logical paths. The amount of needed capacity is calculated by using a trade-off between connection rejection probability and the utilisation of the capacity. This can be used in the process of dimensioning capacity on a long term basis. Two dynamic allocation methods are proposed, which periodically reallocates capacity, according to measured traffic loads. Call admission control is used and automatic connection retrials are studied. Each method is designed for a particular scenario. In the first one, a LAN reserves capacity to get a certain transmission speed for every connection. Capacity is paid for according to how much of it that is reserved. The second one considers an aggregated traffic generated by users having limited bandwidth in their connection to the Internet (e.g. modem- and mobile-users) and the operator of the network manages the capacity. The Internet traffic is modeled as Web pa ge fetches from the Worls Wide Web.

Vi beskriver metoder för att garantera vissa nivåer av service-kvalitet för Internet-trafik genom att reservera kapacitet längs logiska vägar (länkar). Hur mycket kapacitet som behövs räknas ut genom att jämföra utnyttjning mot spärrsannolikhet. Två dynamiska metoder föreslås, som reallokerar kapaciteten periodvis mha mätningar på trafikernas storlek. Förbindelser kan spärras vid uppkopplingsförsök om det är ont om kapacitet och automatiska återförsök görs.