Patent ID: 9584870
Date: 2017-02-28
CPC Classifications: H04L,H04N

Claim:
1. A content locating method, comprising: receiving, by a first content delivery network (CDN) node, a first service request sent by a service control function entity or an IPTV service control function entity, wherein the first service request carries a content identifier which is used to indicate requesting content corresponding to the content identifier; and if the first CDN node is unable to provide content service requested by the first service request, then sending, by the first CDN node, an inquiry request to a CDN global controller, so as to acquire information of a second CDN node which is able to provide the content service requested by the first service request, and requesting the second CDN node to provide the content service; wherein the step of acquiring by the first CDN node the information of the second CDN node comprises: sending, by the first CDN node, an inquiry request to the CDN global controller; allocating, by the CDN global controller, the second CDN node, which is able to provide the content service requested, or a plurality of CDN nodes, including the second CDN node, which are able to provide the content service requested; returning, by the CDN global controller, a response message to the first CDN node, wherein the response message carries the information of the second CDN node or list information of a plurality of CDN nodes including the second CDN node; and acquiring, by the first CDN node, the information of the second CDN node from the response message; wherein before the first CDN node receives the first service request, the method comprises: receiving, by the service control function entity or IPTV service control function entity, a second service request sent by a user equipment, wherein the second service request carries the content identifier and an address of the user equipment; selecting, by the service control function entity or IPTV service control function entity, the first CDN node which is closest to the user equipment according to an area to which the user equipment belongs; and sending, by the service control function entity or IPTV service control function entity, the first service request to the first CDN node, wherein the first service request includes at least one of the following: a video on demand request, a network video recording request, and a real video on demand request; wherein the step of the first CDN node requesting the second CDN node to provide the content service comprises: sending by the first CDN node the first service request to the second CDN node according to the information of the second CDN node; receiving by the second CDN node the first service request, setting up a session between a second media control function entity in the second CDN node and a second media delivery function entity in the second CDN node with the second media delivery function entity providing the content service, and returning an identifier of the session to the first CDN node; and returning by the first CDN node the identifier of the session to user equipment.