Optical transmission system and wavelength allocation method

1. An optical transmission system which connects a plurality of wireless communication systems to each other, the optical transmission system comprising:

a traffic monitor that monitors traffic of optical-terminating devices connected to respective ones of the plurality of wireless communication systems during a terminal device moving among communicable range of the plurality of wireless communication systems;

a connection order acquisitor that estimates a physical arrangement of the optical-terminating devices on a basis of transition of the traffic of the optical-terminating devices; and

a wavelength allocator that allocates different wavelengths to the optical-terminating devices to which the wireless communication systems next to each other are connected, on a basis of the physical arrangement of the optical-terminating devices.

2. An optical transmission system which connects a plurality of wireless communication systems to each other, the optical transmission system comprising:

a traffic monitor that acquires traffic information relating to traffic of each of the plurality of wireless communication systems;

a connection order acquisitor that estimates a physical arrangement of the optical-terminating devices on a basis of the traffic information;

a connection number information acquisitor that acquires connection number information indicating the number of optical-terminating devices connected to the wireless communication systems;

a wavelength information storage unit that stores wavelength information indicating information of a wavelength allocated to each of the optical-terminating devices which is connected to a respective one of the plurality of wireless communication systems; and

a wavelength allocator that allocates different wavelengths to optical-terminating devices to which the wireless communication systems next to each other are connected, on a basis of the physical arrangement of the optical-terminating devices.

3. The optical transmission system according to claim 2 , further comprising a registration unit that registers arrangement information indicating the physical arrangement of the optical-terminating devices estimated by the connection order acquisitor with an optical terminal station device included in the optical transmission system.

4. The optical transmission system according to claim 2 wherein the connection order acquisitor estimates the physical arrangement of the optical-terminating devices on a basis of a distance between the optical terminal station device and each of the optical-terminating devices.

5. The optical transmission system according to claim 1 , wherein the wavelength allocator estimates one optical-terminating device of the optical-terminating devices, which does not generate traffic, on a basis of traffic information of a terminal device that moves among the plurality of wireless communication systems, and makes the estimated one optical-terminating device transition to a stopped state.

6. The optical transmission system according to claim 1 , wherein the wavelength allocator allocates, to one of the optical-terminating devices, a wavelength which is next longest or shortest after a wavelength currently allocated to another one of optical-terminating devices adjacent to the one among wavelengths capable of being allocated to the optical-terminating devices.

7. A wavelength allocation method which is performed by an optical transmission system which connects a plurality of wireless communication systems to each other, the wavelength allocation method comprising:

a step of monitoring traffic of optical-terminating devices connected to respective ones of the plurality of wireless communication systems during a terminal device moving among communicable range of the plurality of wireless communication systems;

a step of estimating a physical arrangement of the optical-terminating devices on a basis of transition of the traffic of the optical-terminating devices; and

a step of allocating different wavelengths to optical-terminating devices to which the wireless communication systems next to each other are connected, on a basis of the physical arrangement of the optical-terminating devices.

8. The optical transmission system according to claim 2 , wherein the wavelength allocator estimates one optical-terminating device of the optical-terminating devices, which does not generate traffic, on a basis of traffic information of a terminal device that moves among the plurality of wireless communication systems, and makes the estimated one optical-terminating device transition to a stopped state.

9. The optical transmission system according to claim 2 , wherein the wavelength allocator allocates, to one of the optical-terminating devices, a wavelength which is next longest or shortest after a wavelength currently allocated to another one of optical-terminating devices adjacent to the one among wavelengths capable of being allocated to the optical-terminating devices.