1. A method comprising:
in a photonic-based distributed network switch that includes a passive photonic broadcast star and a plurality of independent ports each of which is connected to the broadcast star via a plurality of channels, the number of channels connected to each port is equal in number to the number of ports, for each channel of each port: directing a multiplexed optical data frame stream containing a plurality of data frames into a demultiplexer that is connected to the respective channel in the respective port, the number of demultiplexers equals the number of ports, demultiplexing the optical data frame stream into the plurality of data frames, and thereafter directing the plurality of data frames into a data frame reduction stage in the respective port for reducing the data frames.
2. The method of claim 1, wherein the data frame reduction stage determines which data frames to drop and what to do with remaining data frames.
3. A method according to claim 1,
comprising directing the data frames from the demultiplexers in each port to a plurality of data frame reduction stages in the respective port downstream of the demultiplexers.
4. The method of claim 3, wherein the plurality of data frame reduction stages operate in series, in parallel or a combination of series and parallel.
5. A method comprising:
providing a photonic-based distributed network switch that includes a passive optical star and a plurality of independent ports each of which is connected to the optical star via a plurality of channels, the number of channels connected to each port is equal in number to the number of ports; and
for each channel of each port:
directing a multiplexed optical data frame stream containing a plurality of data frames from the passive optical star into the port;
using a plurality of demultiplexers in the port equal in number to the number of ports to demultiplex the multiplexed optical data frame stream into the plurality of data frames, each demultiplexer is connected to a respective one of the channels;
thereafter directing the plurality of data frames into a data frame reduction stage in the port; and
directing data frames that exit the data frame reduction stage to an external. device that is connected to the port.
6. The method of claim 5, wherein the data frame reduction stage of each port determines which data frames to drop and what to do with remaining data frames.
7. The method of claim 5, comprising: for each port directing the plurality of data frames to a plurality of data frame reduction stages in each port downstream of the demultiplexers.
8. The method of claim 7, wherein the plurality of data frame reduction stages in each port operate in series, in parallel or a combination of series and parallel.
9. A photonic-based distributed network switch, comprising:
a passive optical star, and a plurality of independent ports connected to the optical star, each port includes a plurality of demultiplexers connected to the optical star to receive optical data frames and a data frame reduction stage connected to the demultiplexers downstream of the demultiplexers that is configured to reduce optical data frames that are received from the demultiplexers; and the number of demultiplexers in each port equals the number of ports.
10. The photonic-based distributed network switch of claim 9, further comprising a host interface connected to the data frame reduction stage.
11. The photonic-based distributed network switch of claim 9, wherein the data frame reduction stage includes decision logic that determines which data frames to drop and action logic that determine what to do with remaining data frames.
12. The photonic-based distributed network switch of claim 11, comprising a plurality of the data frame reduction stages downstream of the demultiplexer, the plurality of data frame reduction stages are arranged to operate in series, in parallel or a combination of series and parallel.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A communication control device comprising:
a radio communication unit configured to perform radio communication with a plurality of terminal apparatuses of a primary system using communication resources of the primary system; and
a generating unit configured to generate resource information for notifying a secondary system secondarily using the communication resources of available communication resources,
wherein the radio communication unit transmits the resource information generated by the generating unit through a downlink control channel including a common space that is decoded in common by the plurality of terminal apparatuses and a plurality of individual spaces that are decoded by only some of the plurality of terminal apparatuses.
2. The communication control device according to claim 1,
wherein the downlink control channel includes the common space, the plurality of individual spaces, and a secondary system space having the same format as the individual space, and
wherein the radio communication unit transmits the resource information using the secondary system space.
3. The communication control device according to claim 2,
wherein the secondary system space is positioned ahead of all or some of the plurality of individual spaces in a time direction in the downlink control channel.
4. The communication control device according to claim 1,
wherein the resource information includes information for notifying the secondary system of available uplink communication resources of the primary system.
5. The communication control device according to claim 1,
wherein the resource information includes identification information uniquely identifying the available communication resources among a plurality of devices.
6. The communication control device according to claim 1,
wherein the generating unit generates likelihood information for notifying the secondary system of a likelihood of presence of the available communication resources, and
wherein the radio communication unit transmits system information of a frequency band of the primary system, the system information including the generated likelihood information.
7. The communication control device according to claim 6,
wherein the system information includes the likelihood information and other likelihood information for notifying the secondary system of a likelihood of presence of available communication resources of other primary systems.
8. A communication control method comprising:
performing radio communication with a plurality of terminal apparatuses of a primary system using communication resources of the primary system;
generating resource information for notifying a secondary system secondarily using the communication resources of available communication resources; and
transmitting the generated resource information through a downlink control channel including a common space that is decoded in common by the plurality of terminal apparatuses and a plurality of individual spaces that are decoded by only some of the plurality of terminal apparatuses.
9. A communication device comprising:
a radio communication unit configured to receive resource information for notifying a secondary system secondarily using communication resources of a primary system of available communication resources through a downlink control channel including a common space that is decoded in common by a plurality of terminal apparatuses of the primary system and a plurality of individual spaces that are decoded by only some of the plurality of terminal apparatuses; and
a control unit configured to cause the radio communication unit to perform radio communication using the available communication resources based on the resource information acquired by decoding of the downlink control channel.