Patent ID: 7818366

Claim:
A method for performing a point-to-multipoint service attach process in a mobile communication network, the method comprising: receiving a point-to-multipoint service attach request message, at a second network controller from a first network controller when a mobile terminal using at least one point-to-multipoint service which has been provided at a first cell moves from the first cell managed by the first network controller to a second cell managed by the second network controller, the point-to-multipoint service attach request message comprising a list indicating one or more point-to-multipoint services affected by the movement of the mobile terminal from the first cell to the second cell; performing, at the second network controller, the point-to-multipoint service attach process for the mobile terminal according to the point-to-multipoint service attach request message, wherein the point-to-multipoint service attach process comprises adding one or more point-to-multipoint services identified in the point-to-multipoint service attach request message to a point-to-multipoint service list of the second network controller; receiving, at the second network controller from the first network controller upon the mobile terminal leaving the second cell, a point-to-multipoint service detach request message comprising a list indicating one or more point-to-multipoint services affected by the leaving of the mobile terminal; and performing, at the second network controller, a point-to-multipoint service detach process for the mobile terminal according to the point-to-multipoint service detach request message, wherein the point-to-multipoint service detach process comprises removing each of the point-to-multipoint services in the list of the point-to-multipoint service detach request message from the point-to-multipoint service list of the second network controller.