Patent ID: 8767550

Claim:
A method for improving a service restoration speed in a transmission network, comprising: in a service set-up process, receiving, by a Path Computation Element (PCE), a route computation request including restoration attributes and constraint conditions from a Path Computation Client (PCC), and computing and saving restoration routes available for the service according to the constraint conditions; and when a restoration route computation request for the service from the PCC is received, selecting, by the PCE, a route from the restoration routes locally saved and available for the service according to selection conditions included in the restoration route computation request, and sending the route to the PCC which restores the service via the received route; wherein, the PCE is preset with a pre-rerouting service tree; and the method further comprising: saving, by the PCE, a corresponding relationship between service identifier information of the service and the computed restoration routes available for the service in the pre-rerouting service tree; wherein, the step of the PCE saving the restoration routes available for the service comprises: after obtaining the restoration routes available for the service through computation, the PCE creating a list for pre-computed restoration routes, and saving the restoration routes available for the service in the list; and the step of the PCE saving the corresponding relationship between the service identifier information of the service and the computed restoration routes available for the service in the pre-rerouting service tree comprises: the PCE saving the corresponding relationship between a head of the list for the pre-computed restoration routes and the service identifier information of the service in the pre-rerouting service tree by taking the corresponding relationship as a pre-rerouting service table entry.