Transmission device, optical termination device, transmission system, and transmission method

An optical termination device coupled to a passive optical network together with an optical terminal device coupled to a base band unit and further coupled to a remote radio head, the optical termination device comprising:

• a receiver configured to receive, from the optical terminal device, a first signal including wavelength information indicative of a given wavelength of a signal to be received by the optical termination device and communication destination information relating to the remote radio head of a communication destination of the base band unit;
• a transmitter configured to transmit a signal to the optical terminal device;
• and
• a processor configured to decide, based on the communication destination information, whether or not the remote radio head is a remote radio head of the communication destination and causes, where the remote radio head is a remote radio head of the communication destination, the transmitter to transmit a second signal of the given wavelength indicated by the wavelength information, wherein,
• when the receiver receives a third signal responsive to the second signal from the optical terminal device, the processor sets, between the processor and the optical terminal device, a relay path for relaying communication between the base band unit and the remote radio head.

A transmission system, comprising:

• an optical terminal device and a plurality of optical termination devices all coupled to a passive optical network;
• the plurality of optical termination devices being individually coupled to a plurality of remote radio heads;
• the optical terminal device including
• an interface configured to acquire, from a base band unit having a communication destination that is one of the plurality of remote radio heads, communication destination information relating to the remote radio head of the communication destination,
• a receiver configured to receive a signal of a given wavelength from any of the plurality of optical termination devices,
• a transmitter configured to transmit a first signal, which includes wavelength information indicative of the given wavelength and the communication destination information, to the plurality of optical termination devices, and
• a setting unit configured to set, when the receiver receives a second signal of the given wavelength according to the first signal from the optical termination device coupled to the remote radio head of the communication destination from among the plurality of optical termination devices, a relay path for relaying communication between the base band unit and the remote radio head of the communication destination between the setting unit and the optical termination device;
• each of the plurality optical termination devices being operable to decide, based on the communication information, whether or not the remote radio head of the coupling destination from among the plurality of remote radio heads is the remote radio head of the communication destination and transmit, where the remote radio head of the coupling destination is the remote radio head of the communication destination, the second signal of the given wavelength indicated by the wavelength information to the optical terminal device.

A transmission method performed between an optical terminal device and a plurality of optical termination devices all coupled to a passive optical network,

• the plurality of optical termination devices being individually coupled to a plurality of remote radio heads,
• the transmission method comprising:
• acquiring, by the optical terminal device, from a base band unit having a communication destination that is one of the plurality of remote radio heads, communication destination information relating to the remote radio head of the communication destination;
• transmitting, by the optical terminal device, a first signal, which includes wavelength information indicative of a wavelength of a signal to be received from each of the plurality of optical termination devices and the communication destination information, to each of the plurality of optical termination devices;
• deciding, by each of the plurality of optical termination devices, based on the communication destination information whether or not the remote radio head of the coupling destination from among the plurality of remote radio heads is the remote radio head of the communication destination;
• transmitting, by each of the plurality of optical termination devices, where the remote radio head of the coupling destination is the remote radio head of the communication destination, a second signal of a wavelength indicated by the wavelength information to the optical terminal device;
• and
• setting, by the optical terminal device, when the second signal according to the first signal is received from the optical termination device coupled to the remote radio head of the communication destination from among the plurality of optical termination devices, a relay path for relaying communication between the base band unit and the remote radio head of the communication destination between the optical terminal device and the optical termination device.