The invention discloses a collision avoidance
wavelength assignment method based on a PCE (
Personal Computer Equipment), relating to the technical field of
wavelength switched optical networks. The method comprises the following steps of: C, sending Path information to a destination node by a source node; D, after receiving the Path information by the destination node, judging whether a light path available
wavelength set is empty, if so, sending PathErr information to the source node by the destination node and executing a step C; if not, selecting one wavelength as a reserved wavelength, and executing a step E; E, sending RESVReq information to the PCE by the destination node; and F, judging whether the current reserved wavelength is available by the PCE, if so, storing Path ID of the Path information, the current reserved wavelength and RID in a CAT (
Computer Aided Translation) table, and notifying the destination node to send Resv information; if not, selecting a new available wavelength as the reserved wavelength, and executing the step E. According to the method disclosed by the invention, the network backward resource
collision probability can be reduced, therefore, the network blocking rate is reduced.