Device, system, and resource allocation method

A resource allocation method, wherein the method is applied to an S plane device in Application Driven Networking (ADN), the ADN comprises the S plane device, a C plane device, and a D plane device, the D plane device is configured to transmit and forward data in the ADN, the C plane device is configured to control and manage the D plane device, the D plane device controlled and managed by the C plane device forms one subdomain, the S plane device is configured to monitor and configure a resource of an application in each subdomain in the ADN, the method comprising:

• determining resource configuration information of a first application based on a first request sent by a client and global resource information of the ADN, wherein the first request comprises information used to determine a resource requirement of the first application, the resource configuration information of the first application comprises resource configuration of the first application in at least one subdomain in the ADN, and the global resource information comprises resource utilization information of the first application in each subdomain and available resource information in each subdomain;
• and
• sending the resource configuration information of the first application to the client for requesting a C plane controller of the at least one subdomain to configure a resource of the first application in a subdomain to which the C plane controller belongs.