WO2016157626A1

WO2016157626A1 - Station-side device and communication control method

Info

Publication number: WO2016157626A1
Application number: PCT/JP2015/084127
Authority: WO
Inventors: 隆治大西; 一貴河本; 村田　拓史
Original assignee: 住友電気工業株式会社
Priority date: 2015-03-31
Filing date: 2015-12-04
Publication date: 2016-10-06
Also published as: JP2016192668A

Abstract

A station-side device of an embodiment of the present invention that can communicate with multiple types of home-side devices having different rates at which communication signals are transmitted or received comprises: a communication unit that transmits or receives the communication signals to or from the home-side devices; a storage unit that stores information related to the types of the home-side devices that are to communicate with the station-side device; and a control unit that selects, on the basis of the information stored in the storage unit, one of the types to be halted and that executes a control to halt an operation of the station-side device performed for communicating with the home-side device(s) of the selected type.

Description

Station side apparatus and communication control method

The present invention relates to a station-side device and a communication control method, and more particularly to a station-side device and a communication control method for communicating with a plurality of types of home-side devices having different communication speeds.

In recent years, the Internet has become widespread, and users can access various information on sites operated in various parts of the world and obtain the information. Along with this, devices capable of broadband access such as ADSL (Asymmetric Digital Subscriber Line) and FTTH (Fiber To The Home) are rapidly spreading.

In IEEE Std 802.3ah (registered trademark) -2004 (non-patent document 1), a plurality of home-side devices (ONU: Optical Network Unit) share an optical communication line and a station-side device (OLT: Optical Line Terminal) One method of a passive optical network (PON) that is a medium-sharing communication that performs data transmission to the network is disclosed. That is, EPON (Ethernet (registered trademark) PON) in which all information is communicated in the form of an Ethernet (registered trademark) frame, including user information passing through the PON and control information for managing and operating the PON, and EPON An access control protocol (MPCP (Multi-Point Control Protocol)) and an OAM (Operations Administration and Maintenance) protocol are defined. By exchanging MPCP frames between the station side device and the home side device, the home side device joins and leaves, and uplink access multiplexing control is performed. Non-Patent Document 1 describes a registration method for a new home device, a report indicating a bandwidth allocation request, and a gate indicating a transmission instruction using an MPCP message.

In addition, as a next-generation technology of GE-PON (Giga Ethernet (registered trademark) Passive Optical ＥＰ Network), which is an EPON realizing a communication speed of 1 gigabit / second, standardization is carried out as IEEE 802.3av (registered trademark) -2009. Even in the 10 G-EPON, that is, the EPON with a communication speed equivalent to 10 gigabits / second, the access control protocol is predicated on MPCP.

In the PON system, when two types of home-side devices for GE-PON and 10G-EPON as described above are used, the station-side device communicates with these two types of home-side devices. There is a need.

However, in the PON system, both GE-PON and 10G-EPON home-side devices are not always used, and if only one type of home-side device is used, waste may occur in the station-side device. There is sex.

The present invention has been made to solve the above-described problems, and an object of the present invention is to be able to communicate with a plurality of types of home-side devices having different communication speeds and efficiently perform communication operations with the home-side devices. It is to provide a station-side device and a communication control method that can be used.

(1) In order to solve the above problem, a station-side device according to an aspect of the present invention is a station-side device capable of communicating with a plurality of types of home-side devices having different communication signal speeds to be transmitted or received, A communication unit that transmits or receives the communication signal to and from the home side device, a storage unit that stores information on the type of the home side device that should communicate with the station side device, and the storage unit that stores the information A control unit configured to select the type to be stopped based on the information, and to perform control to stop the operation of the station side device for communicating with the home side device of the selected type.

(4) In order to solve the above-mentioned problem, a communication control method according to an aspect of the present invention is a communication control method that is capable of communicating with a plurality of types of home-side devices having different communication signal speeds to be transmitted or received. A communication control method in a device, the step of selecting the type to be stopped based on information on the type of the home side device to be communicated with the station side device, and the home side of the selected type Controlling to stop the operation of the station side device for communicating with the device.

The present invention can be realized not only as a station-side device including such a characteristic processing unit, but also as a program for causing a computer to execute such characteristic processing steps. In addition, the present invention can be realized as a semiconductor integrated circuit that realizes part or all of the station-side device, or as a system including the station-side device.

According to the present invention, it is possible to communicate with a plurality of types of home-side devices having different communication speeds and to efficiently perform communication operations with the home-side devices.

FIG. 1 is a diagram showing a configuration of a PON system according to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of the station side apparatus according to the embodiment of the present invention. FIG. 3 is a diagram showing an example of ONU information in the station side apparatus according to the embodiment of the present invention. FIG. 4 is a diagram showing another example of ONU information in the station side apparatus according to the embodiment of the present invention. FIG. 5 is a diagram showing another example of ONU information in the station-side apparatus according to the embodiment of the present invention. FIG. 6 is a diagram showing a partial configuration of the communication unit in the station-side apparatus according to the embodiment of the present invention. FIG. 7 is a diagram showing an example of a discovery operation in the PON system according to the embodiment of the present invention, and a data flow between the station side device and the ONU. FIG. 8 is a diagram showing stop control of the discovery operation in the PON system according to the embodiment of the present invention. FIG. 9 is a flowchart that defines an example of an operation procedure when the station apparatus in the PON system according to the embodiment of the present invention partially stops operation.

First, the contents of the embodiment of the present invention will be listed and described.

(1) The station-side device according to the embodiment of the present invention is a station-side device capable of communicating with a plurality of types of home-side devices having different communication signal speeds to be transmitted or received, and the home-side device and the communication Based on the information stored in the storage unit, a communication unit that transmits or receives a signal, a storage unit that stores information on the type of the home-side device that should communicate with the station-side device, And a control unit that performs control to stop the operation of the station side device for communicating with the home side device of the selected type.

With such a configuration, while enabling communication with home-side devices having different communication speeds, for example, paying attention to registration information of home-side devices, which is setting information inside the station-side device, homes with unregistered communication speeds When the side device is present, it is possible to selectively stop the operation for communicating with the home side device at the communication speed that is unnecessary. Therefore, the station-side device according to the embodiment of the present invention can communicate with a plurality of types of home-side devices having different communication speeds, and can efficiently perform a communication operation with the home-side device.

(2) Preferably, the communication unit includes a plurality of transmission circuits for transmitting the communication signals of different speeds to the home side device, and the storage unit includes the station side device as information on the type. Storing information on the speed of the communication signal that can be received by the home-side device to be communicated with, and the control unit sets the speed different from the speed of the home-side device to be communicated with the station-side device. Control is performed so as to stop the operation of the transmission circuit corresponding to the selected speed.

With such a configuration, for example, it is possible to prevent a state where an optical output or the like is being performed from a transmission circuit for each communication speed even though there is a home-side apparatus having an unregistered communication speed. Unnecessary power consumption can be prevented.

(3) Preferably, the communication unit transmits / receives the communication signal to / from each home-side device via a common communication line, and the station-side device further provides a bandwidth on the communication line to the home-side device. A band allocation unit to be allocated, wherein the station side device performs a discovery operation for each type, and the band allocation unit further allocates a band for the discovery operation in the communication line for each type, and the control unit Performs control to stop allocation of the discovery operation corresponding to the selected type and the band for the discovery operation.

With such a configuration, for example, it is possible to prevent a state in which a discovery operation is being performed for a home device at each communication speed despite the presence of a home device at a communication speed that is not registered. Thereby, unnecessary power consumption in the station side device can be prevented, and it is possible to prevent the bandwidth on the communication line between the station side device and the home side device from being unnecessarily allocated for the discovery operation.

(4) A communication control method according to an embodiment of the present invention is a communication control method in a station-side device capable of communicating with a plurality of types of home-side devices having different communication signal speeds to be transmitted or received. The step of selecting the type to be stopped based on information on the type of the home side device to be communicated with the device, and the operation of the station side device for communicating with the home side device of the selected type And a step of performing control to stop the operation.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated. Moreover, you may combine arbitrarily at least one part of embodiment described below.

FIG. 1 is a diagram showing a configuration of a PON system according to an embodiment of the present invention.

Referring to FIG. 1, the PON system 301 includes ONUs 202A, 202B, 202C, and 202D, a station-side device 101, and splitters SP1 and SP2. The ONUs 202A, 202B, 202C and the station apparatus 101 are connected via the splitters SP1 and SP2 and the optical fiber OPTF, and transmit / receive optical signals to / from each other. The ONU 202D and the station apparatus 101 are connected via the splitter SP2 and the optical fiber OPTF, and transmit / receive optical signals to / from each other.

Here, the direction from the ONU to the upper network is referred to as an upstream direction, and the direction from the upper network to the ONU is referred to as a downstream direction. In the PON system 301, the uplink direction is time division multiple access (TDMA), and the downlink direction is time division multiple access (TDM).

The station apparatus 101 can communicate with a plurality of types of ONUs 202 having different communication signal speeds such as frames to be transmitted or received.

Specifically, for example, the ONU 202 includes a 1G ONU and a 10G ONU. The 1G ONU transmits a 1 Gbps frame to the station apparatus 101 in the upstream direction and receives a 1 Gbps frame from the station apparatus 101 in the downstream direction. The 10G ONU transmits a 10 Gbps frame to the station side device 101 in the upstream direction and receives a 10 Gbps frame from the station side device 101 in the downstream direction. For example, an ONU for 1G corresponds to GE-PON, and an ONU for 10G corresponds to 10G-EPON.

The station side device 101 includes a communication unit, and the communication unit transmits or receives a frame with the ONU 202. For example, the communication unit in the station side apparatus 101 transmits / receives a frame to / from each ONU 202 via a common communication line, that is, a PON line.

FIG. 2 is a block diagram showing a configuration of the station side apparatus according to the embodiment of the present invention.
The “processing unit” and “control unit” illustrated in FIG. 2 are, for example, a processor that performs logical operation processing such as a CPU (Central Processing Unit), an MPU (Micro-Processing Unit), or an FPGA (Field-Programmable Gate Array). It becomes more. The “storage unit” includes, for example, a memory such as a RAM or a ROM.

Referring to FIG. 2, the station apparatus 101 includes a PON transceiver 11, an upstream reception processing unit 12, an upstream buffer memory 13, an upstream transmission processing unit 14, an SNI transceiver 15, a downstream reception processing unit 16, A downlink buffer memory 17, a downlink transmission processing unit 18, a DBA (Dynamic Bandwidth Allocation) processing unit (bandwidth allocation unit) 19, a control unit 20, and a storage unit 22 are provided. The PON transceiver 11 includes a reception unit 31 and a transmission unit 32. The SNI transceiver 15 includes a transmission unit 33 and a reception unit 34. The communication unit in the station apparatus 101 includes a part or all of each unit shown in FIG.

In the station side device 101, the PON transceiver 11 is connected to the optical fiber OPTF that is a PON line as a master station side starting point of the PON line. The receiving unit 31 in the PON transceiver 11 receives an upstream optical signal of a specific wavelength, for example, 1310 nm band from the optical fiber OPTF and converts it into an electrical signal so that bidirectional communication with each ONU 202 can be performed via the optical fiber OPTF. And output to the uplink reception processing unit 12. In addition, the transmission unit 32 in the PON transceiver 11 converts the electrical signal received from the downstream transmission processing unit 18 into a downstream optical signal having another wavelength and outputs the downstream optical signal to the optical fiber OPTF. For example, the PON transceiver 11 converts an electrical signal of 10 Gbps (gigabit / second) received from the downlink transmission processing unit 18 into a downstream optical signal of 1570 nm band and transmits it to each ONU 202, and receives from the downlink transmission processing unit 18. The 1 Gbps electrical signal is converted into a downstream optical signal in the 1490 nm band and transmitted to each ONU 202.

The upstream reception processing unit 12 reconstructs a frame from the electrical signal received from the PON transceiver 11, and distributes the frame to the DBA processing unit 19, the control unit 20, or the upstream buffer memory 13 according to the type of the frame. Specifically, the data frame is output to the upstream buffer memory 13 and the control frame is output to the DBA processing unit 19 and the control unit 20.

The upstream buffer memory 13 stores the data frame received from the upstream reception processing unit 12.

The upstream transmission processing unit 14 extracts the data frame from the upstream buffer memory 13 and performs predetermined signal processing, and outputs the processed frame to the SNI transceiver 15.

The transmission unit 33 in the SNI transceiver 15 transmits the frame received from the upstream transmission processing unit 14 to the upper network.

The receiving unit 34 in the SNI transceiver 15 outputs the frame received from the upper network to the downlink reception processing unit 16.

The downlink reception processing unit 16 performs predetermined signal processing on the frame received from the SNI transceiver 15 and outputs the processed frame to the downlink buffer memory 17 as a data frame.

The DBA processing unit 19 and the control unit 20 generate control frames indicating various types of control information and output them to the downlink transmission processing unit 18.

The downlink transmission processing unit 18 takes out the data frame from the downlink buffer memory 17, converts it into a physical layer electrical signal, and outputs it to the PON transceiver 11. Further, the downlink transmission processing unit 18 converts the control frame received from the DBA processing unit 19 and the control unit 20 into an electrical signal of the physical layer and outputs the electrical signal to the PON transceiver 11.

The DBA processing unit 19 and the control unit 20 generate control frames such as MPCP frames and OAM frames for operating and managing the PON line and the ONU 202, and transmit them to the ONU 202 via the downlink transmission processing unit 18. Further, the DBA processing unit 19 and the control unit 20 receive control frames such as MPCP frames and OAM frames transmitted from the ONU 202 via the uplink reception processing unit 12 and perform corresponding processes.

Specifically, the DBA processing unit 19 and the control unit 20 perform station side processing related to control and management of the PON line such as MPCP and OAM. In other words, by exchanging MPCP messages and OAM messages with each ONU connected to the PON line, upstream access control including ONU registration, withdrawal and bandwidth allocation, downstream access control, ONU operation management, and the like are performed. .

For example, the DBA processing unit 19 allocates the upstream bandwidth in the PON line to each ONU 202 based on the upstream bandwidth allocation request in the PON line received from each ONU 202. Specifically, the DBA processing unit 19 allocates the bandwidth in the PON line to the ONU 202 based on the report frame indicating the bandwidth allocation request in the PON line received from the ONU 202, that is, transmits a gate frame describing the grant to the ONU 202. To do.

The DBA processing unit 19 repeats an allocation cycle, that is, a DBA cycle including a reception period of a bandwidth allocation request on the PON line from each ONU 202 and a scheduled uplink frame reception period from each ONU 202. Here, for example, the DBA processing unit 19 calculates the bandwidth allocation amount in the scheduled uplink frame reception period from each ONU 202.

The storage unit 22 stores ONU information related to the type of ONU 202 that should communicate with the station-side device 101. The ONU information is created, for example, by a communication carrier and stored in the station side device 101.

The control unit 20 selects a type to be stopped based on the ONU information stored in the storage unit 22, and performs control to stop the operation of the station side device 101 for communicating with the selected type of ONU 202. .

Specifically, the control unit 20 stops a part of the operation of the transmission unit 32 by outputting a control signal to the transmission unit 32 in the PON transceiver 11. Further, the control unit 20 outputs the release signal to the transmission unit 32 in the PON transceiver 11 to restart the operation of the transmission unit 32 that has been stopped.

Also, the control unit 20 stops a part of the operation of the DBA processing unit 19 by outputting a control signal to the DBA processing unit 19. Further, the control unit 20 resumes the operation of the stopped DBA processing unit 19 by outputting a release signal to the DBA processing unit 19.

FIG. 3 is a diagram showing an example of ONU information in the station side apparatus according to the embodiment of the present invention.

Referring to FIG. 3, ONU information is, for example, a table indicating the correspondence between the MAC address of ONU 202 and the communication speed.

Specifically, in this ONU information, the MAC address is “xx: xx: xx: xx: xx: 01” to “xx: xx: xx: xx: xx: 05”, and the communication speed is 1 Gbps, Five ONUs 202 of 1 Gbps, 10 Gbps, 1 Gbps, and 10 Gbps are registered.

That is, since the 1G ONU and the 10G ONU are registered in the station side apparatus 101, and the 1G ONU and the 10G ONU are mixed in the PON system 301, the control unit 20 operates the station side apparatus 101. The control to stop is not performed.

FIG. 4 is a diagram showing another example of ONU information in the station side apparatus according to the embodiment of the present invention.

Referring to FIG. 4, in this ONU information, the MAC address is “xx: xx: xx: xx: xx: 01” to “xx: xx: xx: xx: xx: 05”, and the communication speed is 1 Gbps. The five ONUs 202 are registered.

That is, since the 10G ONU is not registered in the station side device 101 and the 10G ONU does not exist in the PON system 301, the control unit 20 has the station side device 101 for communicating with the 10G ONU. Control to stop the operation.

Note that the ONU information is not limited to a configuration in which the communication speed for each ONU 202 is registered, but may be a configuration in which the communication speed is registered for each port of the station-side apparatus 101, that is, for each PON line.

For example, the station apparatus 101 may be configured to include a plurality of sets of each unit shown in FIG. 2, and in this case, the ONU information indicates the correspondence between the ports of each set and the communication speed of the corresponding PON line. .

FIG. 5 is a diagram showing another example of ONU information in the station side apparatus according to the embodiment of the present invention.

Referring to FIG. 5, in this ONU information, a 0th port having a communication speed of 1 Gbps and 10 Gbps and a 1st port having a communication speed of only 1 Gbps are registered.

In this case, since the 1G ONU and the 10G ONU are mixed under the 0th port, the corresponding set of control units 20 does not perform control to stop the operation of the station side device 101.

On the other hand, since the 10G ONU does not exist under the No. 1 port, the corresponding set of control units 20 performs control to stop the operation of the station side device 101 for communicating with the 10G ONU.

In the PON system 301, since the wavelength of the upstream optical signal on the PON line is common among the ONUs 202 of the respective communication speeds, the storage unit 22 transmits the downstream communication speed, that is, the ONU 202 to communicate with the station side apparatus 101. Any configuration may be used as long as ONU information relating to the receivable frame rate is stored.

FIG. 6 is a diagram showing a partial configuration of the communication unit in the station-side apparatus according to the embodiment of the present invention.

Referring to FIG. 6, the uplink reception processing unit 12 includes a CDR (Clock and Data Recovery) 41, a deserializer 42, and a MAC (Media Access Control) processing unit 43. The downlink transmission processing unit 18 includes a MAC processing unit 43 and a serializer 44. In the PON transceiver 11, the reception unit 31 includes a 10G / 1G optical reception circuit 51. The transmission unit 32 includes a 10G optical transmission circuit 52 and a 1G optical transmission circuit 53.

In the upstream direction, the 10G / 1G optical receiving circuit 51 in the PON transceiver 11 receives an optical signal having a specific wavelength as described above from the ONU 202 via the PON line, and converts the received optical signal into an electrical signal of 1 Gbps or 10 Gbps. Convert and output.

The CDR 41 reshapes the electrical signal received from the 10G / 1G optical receiver circuit 51, extracts the timing from the electrical signal, and performs the retiming of the electrical signal based on the extracted timing. Establish synchronization.

The deserializer 42 converts the serial electrical signal received from the CDR 41 into a parallel electrical signal and outputs the parallel electrical signal to the MAC processing unit 43.

The MAC processing unit 43 reconfigures the frame by performing predetermined processing of the MAC layer on the electrical signal received from the deserializer 42.

In the downstream direction, the serializer 44 converts the parallel electrical signal received from the MAC processing unit 43 into a serial electrical signal, and sends it to the 10G

optical transmission circuit

52 or 1G optical transmission circuit 53 in the PON transceiver 11 according to the speed. Output.

The 10G optical transmission circuit 52 and the 1G optical transmission circuit 53 transmit frames at different speeds to the ONU 202, respectively.

More specifically, the 10G optical transmission circuit 52 converts the 10 Gbps electrical signal received from the serializer 44 into a downstream optical signal having a wavelength corresponding to 10 Gbps, and transmits it to the ONU 202 via the PON line.

Further, the 1G optical transmission circuit 53 converts the 1 Gbps electrical signal received from the serializer 44 into a downstream optical signal having a wavelength corresponding to 1 Gbps, and transmits it to the ONU 202 via the PON line.

The control unit 20 selects a speed different from the speed of the ONU 202 that should communicate with the station-side apparatus 101 as a stop target, and stops the operation of the 10G optical transmission circuit 52 or the 1G optical transmission circuit 53 corresponding to the selected speed. Control to do.

Specifically, the 10G optical transmission circuit 52 and the 1G optical transmission circuit 53 in the PON transceiver 11 stop operating when receiving a control signal from the control unit 20. Specifically, for example, when a control signal is output from the control unit 20 to the 10G optical transmission circuit 52 and the 1G optical transmission circuit 53, power supply to these circuits is stopped.

The 10G optical transmission circuit 52 and the 1G optical transmission circuit 53 resume operation when receiving a release signal from the control unit 20. Specifically, for example, when a control signal is output from the control unit 20 to the 10G optical transmission circuit 52 and the 1G optical transmission circuit 53, power supply to these circuits is started.

The control unit 20 can separately control the stop and restart of the operation of the 10G optical transmission circuit 52 and the 1G optical transmission circuit 53.

FIG. 7 is a diagram showing an example of a discovery operation in the PON system according to the embodiment of the present invention, and a data flow between the station side device and the ONU.

The station side device 101 periodically searches for a new ONU, that is, performs a discovery operation for detecting the ONU 202 newly connected to itself. By this discovery operation, the station apparatus 101 checks whether there is an ONU 202 that should communicate with itself.

In addition, the station apparatus 101 performs a discovery operation for each type of ONU 202. More specifically, the DBA processing unit 19 allocates a band for discovery operation in the PON line for each type of ONU 202.

Specifically, referring to FIG. 7, the station apparatus 101 transmits a discovery gate to the PON line at the start timing ta of the discovery operation of the 1G ONU.

Next, when the station side apparatus 101 receives a valid register request from the 1G ONU in the discovery window Tdw1 designated by the discovery gate, the station side device 101 performs processing for registering the 1G ONU. As a result, the ONU for 1G can communicate with the station side apparatus 101 such as transmission of various frames.

Next, the station apparatus 101 transmits a discovery gate to the PON line at the start timing tb of the discovery operation of the 10G ONU.

Next, when the station apparatus 101 does not receive a valid register request from the 10G ONU in the discovery window Tdw10 designated by the discovery gate, the station side apparatus 101 ends the discovery operation.

Next, the station apparatus 101 transmits a discovery gate to the PON line at the start timing tc of the discovery operation of the 1G ONU.

Next, when the station apparatus 101 does not receive a valid register request from the 1G ONU in the discovery window Tdw1 designated by the discovery gate, the station side apparatus 101 ends the discovery operation.

Next, the station apparatus 101 transmits a discovery gate to the PON line at the start timing tc of the discovery operation of the 10G ONU.

Next, when the station side apparatus 101 receives a valid register request from the 10G ONU in the discovery window Tdw10 designated by the discovery gate, the station side apparatus 101 performs processing for registering the 10G ONU. Thereby, the ONU for 10G can communicate with the station side device 101 such as transmission of various frames.

FIG. 8 is a diagram showing stop control of the discovery operation in the PON system according to the embodiment of the present invention.

The control unit 20 selects a type to be stopped based on the ONU information stored in the storage unit 22, and performs control to stop allocation of the discovery operation corresponding to the selected type and the band for the discovery operation. Do.

Specifically, for example, based on the ONU information shown in FIG. 4 or 5, the control unit 20 stops the discovery operation of the 10G ONU such as the discovery gate transmission process and communicates with the 10G ONU. A control signal for stopping the operation of the station-side device 101 is output to the DBA processing unit 19.

The DBA processing unit 19 receives the control signal from the control unit 20 and stops allocating the bandwidth for the discovery operation of the 10G ONU.

Specifically, referring to FIG. 8, the station apparatus 101 transmits a discovery gate to the PON line at the start timing ta of the discovery operation of the 1G ONU.

Next, the station apparatus 101 does not transmit the discovery gate to the PON line even when the discovery operation start timing tb of the 10G ONU is reached and does not provide the discovery window Tdw10. Then, the station side apparatus 101 releases the band allocated for the discovery window Tdw10 and allocates it to the ONU 202. As a result, the ONU for 1G can transmit, for example, frame 1 to the station apparatus 101 during the period in which the discovery window Tdw10 is assigned.

Next, similarly to the start timing tb, the station apparatus 101 does not transmit the discovery gate to the PON line at the start timing td of the discovery operation of the 10G ONU, and does not provide the discovery window Tdw10. Then, the station side apparatus 101 releases the band allocated for the discovery window Tdw10 and allocates it to the ONU 202. As a result, the 1G ONU can transmit, for example, frame 2 to the station apparatus 101 during the period in which the discovery window Tdw10 is assigned.

In the above example, the station-side device 101 is not limited to the configuration in which the discovery operation is periodically performed, but may be a configuration in which the station-side device 101 is intermittently performed.

[Operation]
Next, an operation when the PON system according to the embodiment of the present invention performs power saving control will be described with reference to the drawings.

Each device in the PON system 301 includes a computer, and an arithmetic processing unit such as a CPU in the computer reads and executes a program including a part or all of each step of the following flowchart and sequence from a memory (not shown). Each of the programs of the plurality of apparatuses can be installed from the outside. The programs of the plurality of apparatuses are distributed while being stored in a recording medium.

FIG. 9 is a flowchart that defines an example of an operation procedure when the station apparatus in the PON system according to the embodiment of the present invention partially stops operation.

Referring to FIG. 9, first, the control unit 20 in the station side apparatus 101 confirms the ONU information in the storage unit 22 (step S <b> 1) to determine whether there is an unregistered type as the ONU 202 in the PON system 301. (Step S2).

When there is an unregistered type (YES in step S2), the control unit 20 performs control to stop the operation in the station side device 101 for communicating with the unregistered type ONU 202 (step S3).

Next, the control unit 20 waits until the ONU information in the storage unit 22 is updated (NO in step S4), and when the ONU information is updated (YES in step S4), confirms the updated ONU information. Thus (step S1), it is confirmed whether or not there is an unregistered type as the ONU 202 in the PON system 301 (step S2).

When the unregistered type no longer exists (NO in step S2), the control unit 20 performs control to stop the operation in the station side device 101 for communicating with a certain type of ONU 202. Control for canceling the stop of the operation is performed (step S5).

Then, the control unit 20 waits again until the ONU information in the storage unit 22 is updated (NO in step S4).

By the way, in the PON system, when two types of home-side devices for GE-PON and 10G-EPON are used, the station-side device needs to communicate with these two types of home-side devices. .

On the other hand, the station side apparatus according to the embodiment of the present invention can communicate with a plurality of types of ONUs 202 having different frame rates for transmission or reception. In the station apparatus 101, the communication unit transmits or receives frames with the ONU 202. The storage unit 22 stores ONU information related to the type of ONU 202 to be communicated with the station side device 101. Then, the control unit 20 selects a type to be stopped based on the ONU information stored in the storage unit 22, and controls to stop the operation of the station side device 101 for communicating with the selected type of ONU 202. To do.

With such a configuration, while enabling communication with ONUs 202 with different communication speeds, there is an ONU 202 with an unregistered communication speed, for example, focusing on registration information of ONU 202 that is setting information inside station-side apparatus 101. In this case, it is possible to selectively stop an operation for communicating with the ONU 202 having the communication speed that is not necessary.

Therefore, the station-side device according to the embodiment of the present invention can communicate with a plurality of types of home-side devices having different communication speeds, and can efficiently perform communication operations with the home-side device.

Also, in the station side apparatus according to the embodiment of the present invention, the 10G optical transmission circuit 52 and the 1G optical transmission circuit 53 transmit frames of different speeds to the ONU 202, respectively. The storage unit 22 stores ONU information relating to the receivable frame rate of the ONU 202 to communicate with the station apparatus 101. Then, the control unit 20 selects a speed different from the speed of the ONU 202 to be communicated with the station apparatus 101 as a stop target, and the operation of the 10G optical transmission circuit 52 or the 1G optical transmission circuit 53 corresponding to the selected speed. Control to stop.

With such a configuration, for example, it is possible to prevent a state in which optical output or the like is being performed from a transmission circuit for each communication speed despite the presence of an ONU 202 having a communication speed that is not registered. Unnecessary power consumption can be prevented.

Further, in the station side apparatus according to the embodiment of the present invention, the communication unit transmits / receives a frame to / from each ONU 202 via a common PON line, that is, a PON line. The DBA processing unit 19 allocates a bandwidth in the PON line to the ONU 202. The station apparatus 101 performs a discovery operation for each type of ONU 202. The DBA processing unit 19 further allocates a band for discovery operation in the PON line for each type of ONU 202. Then, the control unit 20 performs control to stop the discovery operation corresponding to the selected type and the allocation of the bandwidth for the discovery operation.

With such a configuration, for example, it is possible to prevent the discovery operation for the ONU 202 having each communication speed from being performed even though the ONU 202 having an unregistered communication speed exists. Thereby, unnecessary power consumption in the station apparatus 101 can be prevented, and it is possible to prevent unnecessary allocation of a bandwidth in the communication line between the station apparatus 101 and the ONU 202 for the discovery operation.

In the PON system 301, when a certain type of ONU 202 is not registered in the ONU information, the control unit 20 stops the operation of the optical transmission circuit for transmitting a frame to the ONU 202 of that type, and the ONU 202 of that type. Although the configuration is such that both the discovery operation and the bandwidth allocation for the discovery operation are stopped, the present invention is not limited to this. The control unit 20 may be configured to perform any one of the operation stop of the optical transmission circuit, and the stop of the discovery operation and the band allocation for the discovery operation.

In the PON system 301, the wavelength of the upstream optical signal on the PON line is common among the ONUs 202 of each communication speed. However, the present invention is not limited to this, and the wavelength of the upstream optical signal on the PON line is different from each communication speed. Different configurations may be used among the ONUs 202. In this case, for example, the storage unit 22 stores ONU information related to the upstream communication speed, that is, the speed of a frame that can be transmitted by the ONU 202 to communicate with the station apparatus 101. Then, the control unit 20 performs control to stop the operation of the 10G optical receiver circuit or the 1G optical receiver circuit based on the ONU information.

In the PON system 301, there are two types of ONUs 202, 1G ONU and 10G ONU. However, the present invention is not limited to this. For example, there may be a configuration in which there is an asymmetric ONU that transmits a 1 Gbps frame to the station apparatus 101 in the upstream direction and receives a 10 Gbps frame from the station apparatus 101 in the downstream direction.

In this case, for example, when the asymmetric ONU is not registered in the ONU information, the control unit 20 stops the operation of the optical transmission circuit for transmitting a frame to the asymmetric ONU, and performs the asymmetric ONU discovery operation and the discovery operation. At least one of the bandwidth allocation is stopped.

It should be considered that the above embodiment is illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

The above description includes the following features.

[Appendix 1]
A station-side device capable of communicating with a plurality of types of home-side devices having different communication signal speeds for transmission or reception,
A communication unit that transmits or receives the communication signal with the home device;
A storage unit for storing information on the type of the home device to be communicated with the station device;
Based on the information stored in the storage unit, the type to be stopped is selected, and control is performed to stop the operation of the station side device for communicating with the home side device of the selected type. A control unit,
The plurality of types of home-side devices include station-side devices including a home-side device for GE-PON and a home-side device for 10G-EPON.

11 PON transceiver 12 upstream reception processing unit 13 upstream buffer memory 14 upstream transmission processing unit 15 SNI transceiver 16 downstream reception processing unit 17 downstream buffer memory 18 downstream transmission processing unit 19 DBA processing unit (bandwidth allocation unit)
20 control unit 22 storage unit 31 reception unit 32 transmission unit 33 transmission unit 34 reception unit 41 CDR
42 Deserializer 43 MAC processor 44 Serializer 51 10G / 1G optical receiver circuit 52 10G optical transmitter circuit 53 1G optical transmitter circuit 101

Station side devices

202A, 202B, 202C, 202D ONU
301 PON system SP1, SP2 Splitter OPTF Optical fiber

Claims

A station-side device capable of communicating with a plurality of types of home-side devices having different communication signal speeds for transmission or reception,
A communication unit that transmits or receives the communication signal with the home device;
A storage unit for storing information on the type of the home device to be communicated with the station device;
Based on the information stored in the storage unit, the type to be stopped is selected, and control is performed to stop the operation of the station side device for communicating with the home side device of the selected type. A station-side device comprising a control unit.
The communication unit includes a plurality of transmission circuits for transmitting the communication signals of different speeds to the home device,
The storage unit stores information on the speed of the communication signal that can be received by the home-side device to be communicated with the station-side device as information on the type,
The control unit selects the speed different from the speed of the home-side apparatus to be communicated with the station-side apparatus as the stop target, and performs control to stop the operation of the transmission circuit corresponding to the selected speed. The station side apparatus according to claim 1, which is performed.
The communication unit transmits and receives the communication signal to and from each home side device via a common communication line, and the station side device further includes:
A band allocating unit that allocates a band in the communication line to the home device;
The station side device performs a discovery operation for each type,
The band allocating unit further allocates a band for the discovery operation in the communication line for each type,
The station-side apparatus according to claim 1 or 2, wherein the control unit performs control to stop allocation of the discovery operation corresponding to the selected type and a band for the discovery operation.
A communication control method in a station-side device capable of communicating with a plurality of types of home-side devices having different communication signal speeds to be transmitted or received,
Selecting the type to be stopped based on information about the type of the home side device to be communicated with the station side device;
And a step of performing control to stop the operation of the station side device for communicating with the selected type of the home side device.