| 摘要 |
The method comprising receiving, an ALTO server at a network layer, a request from an ALTO client at an application layer to obtain network cost for a connection; computing, the cost information concerning PIDs stored in the ALTO server and adapting, by a request controller, the computed cost information to an ALTO information further sending it to the ALTO server and the latter to said ALTO client; receiving, by a provisioning server, a request from a provisioning client to compute a path for setting up a connection between said PIDs and transmitting said request to a provisioning controller; mapping, the provisioning controller, said received request from the provisioning server into network addresses and computing said path according to said network addresses; and comparing, a network cost of the computed path with a cost information previously stored by the request controller in a request database. |
| 主权项 |
1. A method for cross-stratum path computation in a network, comprising:
a) receiving, an application layer traffic optimization (ALTO) server (10) at a network layer of a network, a request from an ALTO client (100) at an application layer of said network to obtain a network cost map for assisting a connection of an end-user; b) computing, by a routing and/or a path computation engine (40) of said network layer, network cost information concerning a plurality of Provider- defined Identifiers (PIDs) stored in said ALTO server (10); and c) transmitting, the ALTO server (10), upon receiving said computed network cost information from said routing and/or path computation engine (40), the obtained network cost map to said ALTO client (100), the latter deciding through which of said plurality of PIDs to perform said connection with said end- user,wherein said method is characterized in that in said step b) comprises using a request controller (50) at said network layer and queried by said ALTO server (10) adapting the computed network cost information to an ALTO cost information, said request controller (50) further sending said adapted ALTO cost information to the ALTO server (10) and also storing it in a request database (60), and in that the method further comprises:
d) receiving, by a provisioning server (20) at said network layer, a request from a provisioning client (200) of said application layer to compute a path for setting up a connection between said decided plurality of PIDs, said provisioning server (20) further transmitting said request to a provisioning controller (70); e) mapping, by said provisioning controller (70), said received request from the provisioning server (20) into network addresses using ALTO identifiers; f) querying, by said provisioning controller (70), said routing and/or path computation engine (40) for computing said path according to said network addresses; and g) comparing, by the provisioning controller (70), upon receiving said computed path from the routing and/or path computation engine (40), a network cost of the computed path with said cost information stored in said request database (60). |
