JP5155200B2 - Composite shared access communication system, station side apparatus and subscriber terminal - Google Patents

Description

  The present invention relates to a composite communication system, a composite shared access communication system capable of smoothly communicating between a plurality of devices having different communication speeds, a station side device thereof, and a subscriber terminal.

  One form of an optical access network that performs data transmission over an optical fiber in the access line area is an SS (Single Star) type network form 1100 as shown in FIG. In the SS type network form 1100, communication between an OLT (Optical Line Terminal) 1110 and an ONU (Optical Network Unit) 1150 occupies the band of the optical fiber 1120. As shown in FIG. 10, the SS network form 1100 may include a terminal workstation 1160 connected to the ONU 1150.

  As another form of the optical access network, there is a PON (Passive Optical Network) type network form 1200 as shown in FIG. In the PON type network form 1200, the optical fiber 1400 between the optical splitter 1500, which is a branching point to an ONU (Optical Network Unit) 1700 placed in each of a plurality of subscribers' homes, etc., and the OLT 1300 placed in the telephone station etc. The bandwidth is shared by each ONU (Optical Network Unit) 1700. The optical splitter 1500 and the ONU 1700 are connected by a dedicated optical fiber 1600. The PON network form 1200 may include a terminal workstation 1800 connected to the ONU 1700.

  The media converter is a typical apparatus that transmits data in a point-to-point (hereinafter also referred to as “P2P” as appropriate) transmission method in the SS network form 1100.

  In recent years, a transmission method using Ethernet (registered trademark) standardized by the IEEE 802 committee has been applied to the access line area by a method called EFM (Ethernet (registered trademark) in the First Mile). It is coming. The EFM transmission system established by IEEE includes, for example, “1000BASE-BX10” as a P2P transmission system that realizes a transmission rate of 1 Gbps.

  Similarly, in the PON type network configuration 1200 that realizes a transmission rate of 1 Gbps, “1000BASE-PX10” and “1000BASE-PX20” that is a long-distance compatible method are cited as point-to-multipoint transmission methods. It is done. “1000BASE-PX10” and “1000BASE-PX20” are commonly called “EPON (Ethernet (registered trademark) Passive Optical Network)”. Such a network configuration is disclosed, for example, in Patent Document 1 below.

  By the way, the 10 Gbps EPON expected as the next-generation EPON (hereinafter referred to as 10G-EPON as appropriate) is required to be compatible with the existing 1G-EPON network form from the viewpoint of cost and avoidance of interruption due to construction. It was a thing.

JP 2003-332991 A

  In a conventional communication system or the like, it is not assumed that 10G-EPON is additionally provided on the OLT side in 1G-EPON, and communication when 1G-EPON and 10G-EPON use the same line is assumed. There was no way.

  The present invention has been made in view of the above-described problems, and even in the case where a plurality of upper communication devices and a plurality of lower communication devices whose data transmission timing is controlled by the upper communication devices are included. An object of the present invention is to provide a communication system that can communicate smoothly.

  In one aspect of the composite communication system according to the present invention, there are a plurality of communication systems having a lower communication device whose data transmission timing is controlled and a higher communication device which controls the data transmission timing of the lower communication device. In a composite communication system connected on the same line, the upper communication apparatus adjusts the data transmission timing of the lower communication apparatus between different communication systems, and includes different communication systems based on the adjustment result. It controls the data transmission timing of the lower communication device.

  Also, in one aspect of the composite shared access communication system according to the present invention, a shared access communication in which a plurality of subscriber terminals and one station side device that controls the data transmission timing of the subscriber terminals are connected in a many-to-one manner. In a composite shared access communication system in which a plurality of systems are connected on the same line, a plurality of station-side devices communicate with each other between the station-side devices, adjust the data transmission timing of the subscriber terminal, and It controls the data transmission timing of the terminal.

  In one aspect of the station side device of the composite shared access communication system according to the present invention, the station side device is preferably connected to another station side device connected on the same line and data transmission timings of a plurality of subscriber terminals. Thus, the data transmission timings of the plurality of subscriber terminals are controlled so as not to overlap in time on the same line.

  In another aspect of the composite shared access communication system according to the present invention, a plurality of shared access communication systems in which a plurality of subscriber terminals and one station side device are connected in a many-to-one manner are connected on the same line. In the composite shared access communication system, a predetermined one station apparatus may control the data transmission timing of all the subscriber terminals.

  In another aspect of the composite shared access communication system according to the present invention, preferably, when the station side device notifies the subscriber terminal of the data transmission timing, it notifies the subscriber terminal via the other station side device, and subscribes. The data transmission timing of the user terminal may be controlled.

  Further, when the station side device of another aspect of the composite shared access communication system according to the present invention notifies the data transmission timing to the subscriber terminal that cannot communicate directly with the station side device, the data transmission timing to be notified is set to the subscriber terminal. The subscriber terminal is notified through another station side device that can directly communicate with the subscriber terminal, and the data transmission timing of the subscriber terminal is controlled.

  In addition, the station side device according to another aspect of the composite shared access communication system according to the present invention is notified of the data transmission timing from the station side device that controls the data transmission timing of the subscriber terminal, and can directly communicate the data transmission timing. May be transferred to a new subscriber terminal.

  In another aspect of the composite shared access communication system according to the present invention, a plurality of shared access communication systems in which a plurality of subscriber terminals and one station side device are connected in a many-to-one manner are connected on the same line. In the composite shared access communication system, a predetermined one station side device controls the data transmission timing of all the subscriber terminals, and each station side device that receives the data transmission request message from the subscriber terminal The received data transmission request message is transferred to the side device.

  In another aspect of the station side device of the composite shared access communication system according to the present invention, when a data transmission request message is received from a subscriber terminal capable of direct communication, the data is received by a predetermined one station side device. The data transmission request message is transferred.

  Further, in another aspect of the station side device of the composite shared access communication system according to the present invention, a data transmission request message transmitted from a subscriber terminal that cannot directly communicate with another station side that can directly communicate with the subscriber terminal. The data transmission timing of the subscriber terminal that is transferred from the apparatus and cannot communicate directly based on the transferred data transmission request message is controlled.

  Further, in another aspect of the station side device of the composite shared access communication system according to the present invention, a shared access communication system in which a plurality of subscriber terminals and one station side device are connected in a many-to-one manner is provided on the same line. In a multiple shared composite access communication system, a predetermined one station apparatus controls the data transmission timing of all subscriber terminals and receives a registration message including subscriber information from the subscriber terminals. Is characterized by transferring the received registration message to a predetermined one station side device.

  The station apparatus according to another aspect of the composite shared access communication system according to the present invention preferably has registration information of a subscriber terminal that has transmitted a registration message when a registration message is received from a subscriber terminal capable of direct communication. And a registration message is transferred to a predetermined one station apparatus.

  Further, the station side device of another aspect of the composite shared access communication system according to the present invention is preferably based on a subscriber terminal registration message transferred from another station side device capable of direct communication with the subscriber terminal. The registration information of subscriber terminals that cannot be directly communicated is stored.

  The station side device of the above-mentioned composite shared access communication system transfers the data traffic of the subscriber terminal based on the data transmission capability information notified from the subscriber terminal and the data reception capability information of the local station side device. It may be determined whether or not to do so.

  In addition, a subscriber terminal of the shared access communication system according to the present invention includes a shared access communication system in which a plurality of subscriber terminals and a station side device that controls data transmission timing of the subscriber terminals are connected. Alternatively, the data transfer time may be calculated based on the data amount held in the data transmission waiting buffer and the data transmission capability information, and the calculated data transfer time may be notified to the station side device.

  Further, when the subscriber terminal of the above-described composite shared access communication system notifies the predetermined amount of data to be transmitted by the subscriber terminal to the predetermined one station-side device, the data reception capability information of the station-side device, the subscriber terminal The transmission data amount to be notified may be calculated from the data transmission capability information and the actual data amount held in the transmission waiting buffer, and the calculated correction data amount may be notified.

  Even in the case of a plurality of higher-level communication devices and a plurality of lower-level communication devices whose data transmission timing is controlled by the higher-level communication devices, it is possible to provide a communication system that can smoothly communicate.

1 is a schematic diagram conceptually illustrating a communication system according to a first embodiment of the present invention. It is a schematic diagram which illustrates notionally the shared access communication system concerning 2nd embodiment of this invention. It is a schematic diagram which illustrates notionally the structure of the communication system concerning 3rd embodiment. It is a conceptual block diagram explaining the shared access communication system concerning 4th embodiment. It is a schematic diagram explaining the structure outline | summary of the communication system concerning 5th embodiment. It is a conceptual diagram which illustrates typically the structure outline | summary of the communication system concerning 6th Embodiment. It is a conceptual diagram which illustrates typically the structure outline | summary of the communication system concerning 7th Embodiment. It is a conceptual diagram which illustrates typically the structure outline | summary of the communication system concerning 8th embodiment. It is a conceptual diagram which illustrates typically the structure outline | summary of the communication network system concerning 9th Embodiment. It is a figure explaining SS (Single Star single star) type network form. It is a figure explaining the PON (Passive Optical Network) type | mold network form.

  In the present embodiment, a communication system and a communication device that transmit data traffic will be described. Shared access communication system in which a plurality of communication terminals are connected on the same line by one-to-many connection, etc., and a station-side terminal device (typically OLT side) used in the shared access communication system and a subscriber Suitable for terminals (typically ONU side). A shared access communication system known as a method of performing communication by sharing one optical fiber typically divides a 10 Mbps optical fiber into 1 to 32 lines using a splitter (optical multiplexer / demultiplexer). In this method, each divided optical fiber is drawn into each user's house contracted with the service provider, and the minimum bandwidth guarantee can be set to 0.3 Mbps, for example.

  When a 10G-EPON system is newly added to a network in which a 1G-EPON system has been introduced, the existing device can be easily changed by updating the firmware of the existing device 1G-EPON OLT by applying the embodiment. A 10G-EPON system, which is a new system, can be constructed while utilizing 1G-EPON equipment.

  For this reason, the line operator can newly provide the 10G-EPON service while continuing the existing 1G-EPON service, and further reduce the 1G-EPON function on the 10G-EPON side, thereby suppressing additional investment. be able to.

  Here, a general configuration of the communication system will be briefly described. As a typical example of a communication system using one-to-many connection, a PON (Passive Optical Network) / PDS (Passive Double Star) method is raised, and in recent years, a communication system using the PON technology is widely spread. In the PON technology, a plurality of station-side terminators called OLT (Optical Line Terminal) and subscriber terminals called ONU (Optical Network Unit) are connected on the same line by branching an optical fiber with an optical splitter. Thus, communication by one-to-many connection is realized.

  For example, in a 1G-EPON (or GE-PON, 1 Gigabit Ethernet Passive Optical Network) system using Ethernet technology, data is distributed simultaneously using the TDM (Time Division Multiplexing) method in the downstream and addressed to itself by the ONU The data is selected. However, since uplink is an individual distribution for each ONU by the TDMA (Time Division Multiple Access) method, it is necessary to control the data transmission timing of each ONU. In other words, this is to avoid an overlapping state in which data is simultaneously transmitted from a plurality of ONUs on the OLT side.

  The OLT controls the ONU data transmission timing in the upstream direction (typically with respect to the OLT). Specifically, when the ONU transmits data in the upstream direction, the OLT notifies the OLT of the data amount owned by itself, and notifies the OLT of the data transmission request. The OLT determines the transmission timing / transmission time of the ONU based on the transmission request data amount received from the ONU, and notifies the ONU.

  For this reason, in the PON system, only one PON system based on a combination of one OLT and a plurality of ONUs can exist on one optical fiber. It is not assumed that a plurality of PON systems coexist on one fiber, and it is not assumed that a plurality of OLTs control each PON system.

  An example of a PON system that coexists with 1G-EPON is 10G-EPON (10 Gigabit Ethernet Passive Double Star). 10G-EPON is currently being standardized as an IEEE P802.3av recommendation by the Institute of Electrical and Electronic Engineers (IEEE). In 1G-EPON, the communication speed is 1G / 1G for both downlink and uplink, whereas in 10G-EPON, both downlink and uplink are 10G / 10G or 10G / 1G. The accelerated 10G-EPON is expected as the next generation technology of 1G-EPON.

  The 10G-EPON standard is standardized so that it can coexist on the same optical fiber as an existing 1G-EPON system. The 10G-EPON standard allows simultaneous communication between 1G-EPON and 10G-EPON because communication in the downstream direction is based on WDM (Wavelength Division Multiplexing). However, in the upstream direction, since all the ONUs including 1G-EPON and 10G-EPON perform communication by the TDMA method, it is necessary to control data transmission timing from the OLT to the ONU.

  In the 10G-EPON standard, studies are being made to enable both control from 10G-EPON OLT to 1G-EPON ONU and 10G-EPON ONU. However, even in this case, it is necessary to have only one OLT on the same optical fiber. Therefore, when the 1G-EPON system and the 10G-EPON system coexist on the same optical fiber, they are operated first. It is necessary to remove the existing 1G-EPON OLT and newly introduce the 10G-EPON OLT.

  In 10G-EPON, there are 10 / 10G-EPON called PR class at 10 Gbps for both downlink and uplink, and 10 / 1G-EPON called PRX class for uplink 1 Gbps and downlink 10 Gbps. FIG. 1B is a table showing whether or not communication is possible for OLT and ONU of 10 / 10G-EPON, 10 / 1G-EPON and 1G-EPON.

(First embodiment)
The communication system described in the first embodiment is a communication system in which a plurality of communication devices are connected on the same line. The plurality of communication devices described above are subordinates whose data transmission timing is controlled by a higher-level communication device. And a plurality of higher-level communication devices that control the data transmission timing of the lower-level communication devices.

  In the communication system described in the first embodiment, data of lower communication devices (for example, communication terminals) is adjusted by communicating with each other and adjusting data transmission timing between a plurality of higher communication devices. Control sending timing.

  FIG. 1 is a schematic diagram conceptually illustrating a communication system according to a first embodiment of the present invention. Communication devices 101 and 102 are connected to the upper side on the same communication line 110, and communication devices 103, 104, 105, and 106 are connected to the lower side on the same communication line 110.

  The higher-level communication devices 101 and 102 each control communication within the communication system 100, and the lower-level communication devices 103, 104, 105, and 106 are either one of the higher-level communication devices 101 and 102, respectively. Communication is controlled from one to transmit data.

  When the higher-level communication devices 101 and 102 control the data transmission of the lower-level communication devices 103, 104, 105, and 106, communication is performed between the higher-level communication devices 101 and 102, and the lower-level communication device 103. , 104, 105 and 106, the data transmission timing is adjusted and controlled.

  As a result, in data transmission from the lower-level communication devices 103, 104, 105, and 106 to the higher-level communication devices 101 and 102, communication can be performed without duplication of data transmission between the lower-level communication devices. Is possible.

(Second embodiment)
In the second embodiment, a communication mode in which a plurality of one-to-many shared access communication systems are mixed on one line will be described. In this communication mode, each shared access communication system includes a plurality of subscriber terminals and a station-side terminating device that controls data transmission timing of the subscriber terminals. Further, the station side terminal devices communicate with each other to adjust the data transmission timing, thereby controlling the data transmission timings of a plurality of subscriber terminals so as not to overlap.

  FIG. 2 is a schematic diagram conceptually illustrating a shared access communication system 200 according to the second embodiment of the present invention. In the shared access communication system 200, a 10 / 10G-EPON communication system 207 and a 1G-EPON communication system 208 are mixed on the same line 210.

  Further, in the 10 / 10G-EPON communication system 207, the 10 / 10G-EPON OLT 201 is responsible for data transmission control and data transfer of the 10 / 10G-EPON ONUs 203 and 204. In the 1G-EPON communication system 208, the 1G-EPON OLT 202 is responsible for data transmission control and data transfer of the 1G-EPON ONUs 205 and 206.

  Further, as shown in FIG. 1B, direct communication between the OLT and the ONU between different communication systems cannot be performed because the data transmission / reception speeds are different. Further, in the 10 / 10G-EPON communication system 207 and the 1G-EPON communication system 208, the downlink direction is a wavelength division multiplexing system, so simultaneous communication on the same line is possible. However, since the upstream direction is a time division multiplexing system, the ONUs 203, 204, 205, and 206 need to perform data transmission so as not to overlap in time according to the data transmission timing control from the respective OLTs 201 and 202.

  In the shared access communication system 200 shown in the present embodiment, communication is performed between the 10 / 10G-EPON OLT 201 and the 1G-EPON OLT 202, and each of the 10 / 10G-EPON OLT 201 and the 1G-EPON OLT 202 is associated with each other. Adjust the data transmission timing in the upstream direction. Then, the 10 / 10G-EPON OLT 201 determines and controls the uplink data transmission timing of the ONUs 203 and 204 that it manages. The 1G-EPON OLT 202 determines and controls the uplink data transmission timing of the ONUs 205 and 206 managed by the OLT itself.

(Third embodiment)
The communication system described in the third embodiment determines and controls the data transmission timing of the subscriber terminal by adjusting the data transmission timing with another station-side terminal device connected on the same line. It is a system characterized by.

  FIG. 3 is a schematic diagram conceptually illustrating the configuration of the communication system 300 according to the third embodiment. In FIG. 3, 301 is a station-side terminator, 304 is another station-side terminator connected on the same line 310, and 305 (1), 305 (2). , 305) are subscriber terminals connected on the same line 310.

  The station-side terminal device 301 includes a timing adjustment unit 302 that adjusts the data transmission timing from the subscriber terminal 305 with the station-side terminal device 304. Further, the station-side terminal device 301 includes a timing control unit 303 that performs timing control on the subscriber terminal 305 so that the data transmission timing adjusted by the timing adjustment unit 302 is reached.

  When the station-side terminal device 301 controls the data transmission of the subscriber terminal 305, the timing adjustment unit 302 adjusts the data transmission timing with another station-side terminal device 304. The timing control unit 303 determines the data transmission timing of each subscriber terminal 305 based on the timing information adjusted by the timing adjustment unit 302, and performs data transmission control.

  The processing of the timing control unit 303 may be realized by a processing function such as a digital signal processor (DSP).

(Fourth embodiment)
In the fourth embodiment, in a communication mode in which a plurality of one-to-many shared access communication systems are mixed on one line, each shared access communication system includes a plurality of subscriber terminals and one station side. A description will be given of a communication system that includes a termination device and in which all subscriber terminals connected on the same line determine and control data transmission timing by one station-side termination device.

  FIG. 4 is a conceptual configuration diagram illustrating a shared access communication system 400 according to the fourth embodiment. Reference numerals 410 and 411 shown in FIG. 4 are point-to-multipoint shared access communication systems represented by PON. The shared access communication system 410 and the shared access communication system 411 exist on one line 412 at the same time.

  The shared access communication system 410 and the shared access communication system 411 include station-side terminal devices 401 and 404, respectively. The shared access communication system 400 includes subscriber terminals 406, 407, 408, and 409 that transmit data under the control of the station-side terminal devices 401 and 404.

  That is, the station-side terminal device 401 and the subscriber terminals 406 and 407 constitute a shared access communication system 410. The station-side terminal device 404 and the subscriber terminals 408 and 409 constitute a shared access communication system 411. The station-side terminal device 401 includes a data transfer unit 402 for transferring data of subordinate subscriber terminals 406 and 407. Further, the station side termination device 404 includes a data transfer unit 405 for transferring data of subordinate subscriber terminals 408 and 409.

  In the shared access communication system 400, only the station-side terminal device 401 adjusts the data transmission timing of each of the subscriber terminals 406, 407, 408, and 409. That is, the timing control unit 403 included in the station side terminal device 401 performs timing control for all the subscriber terminals 406, 407, 408, and 409 in the shared access communication system 400.

  As described above, in the shared access communication system 400 including the different shared access communication systems 410 and 411, the data transmission timing control of all the subscriber terminals 406, 407, 408, and 409 is performed by one station-side terminal device 401. Do. As a result, each of the subscriber terminals 406, 407, 408, and 409 can smoothly transmit data without data collision.

(Fifth embodiment)
The communication system described in the fifth embodiment is a communication mode in which a plurality of one-to-many shared access communication systems coexist on one line, and each shared access communication system is connected to a plurality of subscriber terminals. Each station-side terminal device is provided, and only one station-side terminal device adjusts the determination and control of the data transmission timing of the subscriber terminal. In addition, one station-side terminal device that determines and controls data transmission timing transmits a message via a station-side terminal device other than itself when notifying each subscriber terminal of the data transmission timing. Control subscriber terminals.

  FIG. 5 is a schematic diagram for explaining a configuration outline of a communication system 500 according to the fifth embodiment. 501 shown in FIG. 5 is 1G-EPON OLT. In the communication system 500 according to the fifth embodiment, the timing control unit 502 provided in the 1G-EPON OLT 501 adjusts data transmission timing control in the upstream direction (direction from the ONU to the OLT) of all ONUs on the same line 516. .

  Moreover, 508 shown in FIG. 5 is a 10 / 10G-EPON OLT. In the communication system 500, the 10 / 10G-EPON OLT 508 does not perform ONU uplink data transmission timing control performed by a normal OLT. Further, 513 shown in FIG. 5 is a 10 / 10G-EPON ONU, 514 shown in FIG. 5 is a 10 / 1G-EPON ONU, and 515 shown in FIG. 5 is a 1G-EPON ONU.

  Each ONU 513, 514, 515 transmits an MPCP register request (MPCP Register Request) message in response to an MPCP (Multi-Point Control Protocol) discovery gate (Discovery Gate) message from the OLT 501 or 508 in advance. The own ONUs 513, 514, and 515 information are registered in the OLTs 501 and 508.

  Thereafter, when the ONUs 513, 514, and 515 perform data transmission, the ONUs 513, 514, and 515 themselves notify the OLTs 501 and 508 of the data transmission by the MPCP Report message. Then, the OLTs 501 and 508 notify the ONUs 513, 514, and 515 of the data transmission timings of the ONUs 513, 514, and 515 in the upstream direction (ONU to OLT direction) using an MPCP gate message.

  The 1G-EPON ONU 515 can directly communicate with the 1G-EPON OLT 501 in both the downlink and uplink directions. Accordingly, the registration processing by the MPCP discovery gate message and the MPCP register request message, the data transmission request by the MPCP report, and the data transmission timing control communication by the MPCP gate message are directly performed between the 1G-EPON ONU 515 and the 1G-EPON OLT 501. To do.

  However, the 10 / 1G-EPON ONU 514 and the 10 / 10G-EPON ONU 513 cannot communicate directly with the 1G-EPON OLT 501 because the communication speeds are different, and therefore communicate via a relay via the 10 / 10G-EPON OLT 508. And The 10 / 1G-EPON ONU 514 and the 10 / 10G-EPON ONU 513 communicate with each other in the downlink direction at 10 Gbps, and thus can communicate with the 10 / 10G-EPON OLT 508.

  In the downlink direction in the communication system 500, since the 10 / 10G-EPON ONU 513 and the 10 / 1G-EPON ONU 514 are both 10 Gbps, the 10 / 10G-EPON ONU 513 and the 10 / 1G-EPON ONU 514, the 1G-EPON OLT 501, Because the communication speed differs between the two, direct communication cannot be performed.

  Therefore, the MPCP discovery gate message from the 1G-EPON OLT 501 to the 10 / 10G-EPON ONU 513 and the 10 / 1G-EPON ONU 514 and the MPCP gate message for data transmission timing control are 10 / 10G-EPON ONU 513 and 10 / 1G. -Via a 10 / 10G-EPON OLT 508 that can communicate directly with the EPON ONU 514. That is, the MPCP discovery gate message from the 1G-EPON OLT 501 to the 10 / 10G-EPON ONU 513 and the 10 / 1G-EPON ONU 514 and the MPCP gate message used for data transmission timing control are transmitted via the 10 / 10G-EPON OLT 508. / 10G-EPON ONU 513 and 10 / 1G-EPON ONU 514.

  In this case, since the 1G-EPON OLT 501 is addressed to all the subscriber terminals 513, 514, and 515 for the MPCP discovery gate message, the timing control transfer unit 503 includes the 1G-EPON ONU 515 that can directly communicate with itself. Transfer to 10 / 10G-EPON OLT 508.

  It recognizes that the 1G-EPON OLT 501 cannot directly communicate with the 10 / 10G-EPON ONU 513 and the 10 / 1G-EPON ONU 514 from the user setting information, registration information of the corresponding ONU by the MPCP register request, and the like. The timing control transfer unit 503 of the 1G-EPON OLT 501 can directly communicate the MPCP gate messages addressed to the 10 / 10G-EPON ONU 513 and the 10 / 1G-EPON ONU 514 generated by the timing control unit 502 with the ONU. Transfer processing to 10 / 10G-EPON OLT 508 is performed.

  That is, when recognizing that a subscriber terminal that cannot communicate directly is connected to the line, when notifying the subscriber terminal of the data transmission timing, another station capable of direct communication with the subscriber terminal By transmitting a data transmission timing notification message to the side terminal device, it is possible to provide a station side terminal device that performs data transmission control of the subscriber terminal.

  Similarly, in the 10 / 10G-EPON OLT 508, since the MPCP discovery gate message is addressed to all the subscriber terminals 513, 514, and 515, timing control is performed to the subordinate 10 / 10G-EPON ONU 513 and the 10 / 1G-EPON ONU 514. Transfer is performed by the relay unit 509. The 10 / 10G-EPON OLT 508 can directly communicate with the 10 / 10G-EPON ONU 513 and the 10 / 1G-EPON ONU 514 only from itself based on the user setting information and the ONU registration information based on the MPCP register request. Recognize For this reason, when the MPCP gate message addressed to the ONU is received from the 1G-EPON OLT 501, the timing control relay unit 509 performs a transfer process to the ONU.

  That is, a station-side terminating device that receives a data-sending-timing notification message to a subscriber terminal that can directly communicate with it from a station-side terminating device that controls data transmission timing of the subscriber terminal, and forwards the message to the subscriber terminal It can be.

  In the uplink direction in the communication system 500, the uplink direction of the 10 / 10G-EPON ONU 513 is 10 Gbps, so the 10 / 10G-EPON ONU 513 cannot directly communicate with the 1G-EPON OLT 501. For this reason, the MPCP register request message (registration information) and the MPCP report message (uplink data transmission request) transmitted from the 10 / 10G-EPON ONU 513 can be directly communicated with the 10 / 10G-EPON ONU 513. The data is transferred from the 10 / 10G-EPON OLT 508 to the 1G-EPON OLT 501 via the EPON OLT 508.

  That is, in a communication mode in which a plurality of one-to-many shared access communication systems coexist on one line, each shared access communication system includes a plurality of subscriber terminals and one station-side terminal device, The data transmission timing of the subscriber terminal is determined and controlled by only one station-side terminal device, and the station-side termination measure that receives the data transmission request message from the subscriber terminal determines and controls the data transmission timing described above. The data transmission request message from the subscriber terminal can be transmitted by transferring the data transmission request message to the station-side terminal device.

  Further, in a communication form in which a plurality of one-to-many shared access communication systems are mixed on one line, each shared access communication system includes a plurality of subscriber terminals and one station-side terminal device, The data transmission timing of the subscriber terminal is determined and controlled by only one station-side terminal device, and the station-side termination measure that receives the registration message from the subscriber terminal is the station side that determines and controls the data transmission timing described above. A communication system for transmitting subscriber information by transferring the registration message to a terminal device can be provided.

  In this case, when the 10 / 10G-EPON OLT 508 receives the MPCP register request message, the 10 / 10G-EPON OLT 508 registers the ONU information in the message in the ONU information registration unit 512. Also, the registration information relay unit 511 included in the 10 / 10G-EPON OLT 508 transfers the received MPCP register request message to the 1G-EPON OLT 501 that performs data transmission timing control of the subscriber terminal.

  That is, when a registration message is received from a subscriber terminal with which the terminal itself can directly communicate, the registration message is transferred to a station-side terminal device that determines and controls the data transmission timing of the subscriber terminal, and the subscriber It can be a station-side terminal device that registers terminal information.

  When the 10 / 10G-EPON OLT 508 receives the MPCP report message, the 10 / 10G-EPON OLT 513 itself is determined by the 10 / 10G-EPON OLT 513 from the user setting information, the ONU registration information by the MPCP register request, and the like. Recognize that only direct communication is possible. Therefore, the data transmission request relay unit 510 included in the 10 / 10G-EPON OLT 508 performs a transfer process of the MPCP report message to the 1G-EPON OLT 501.

  That is, when a data transmission request message is received from a subscriber terminal with which the terminal itself can directly communicate, a station that forwards the data transmission request message to a station-side terminal device that determines and controls the data transmission timing of the subscriber terminal It can be a side termination device.

  On the other hand, when the 1G-EPON OLT 501 receives the MPCP register request message of the 10 / 10G-EPON ONU 513 transferred from the 10 / 10G-EPON OLT 508 in the registration information receiving unit 507, the MPCP register directly received from the 1G-EPON ONU 515 Similar to the request message, the ONU information in the message of the received MPCP register request message is registered in the ONU information registration unit 506.

  That is, a station that receives a registration message from a subscriber terminal that cannot communicate directly with another station-side terminal capable of direct communication with the subscriber terminal, and registers information of the subscriber terminal based on the registration message It can be a side termination device.

  In addition, when the 1G-EPON OLT 501 receives the forwarded MPCP report message, it cannot directly communicate with the 10 / 10G-EPON ONU 513 from the user setting information or the ONU registration information by the MPCP register request. I recognize that. Therefore, when the data transmission request receiving unit 505 included in the 1G-EPON OLT 501 receives the MPCP report message transferred from the 10 / 10G-EPON OLT 508, the data transmission request processing unit 504 performs the upstream data transmission timing of each ONU. Is calculated. This calculation process is the same as the normal MPCP report message received from the 1G-EPON ONU 515 by direct communication.

  That is, a data transmission request message from a subscriber terminal that cannot directly communicate is received from another station-side terminal device that can directly communicate with the subscriber terminal, and is sent to the subscriber terminal based on the data transmission request message. It can be a station-side terminal device that performs data transmission control.

  Particularly for the 10 / 1G-EPON ONU 514, the upstream direction is 1 Gbps, and the downstream direction is 10 Gbps. Therefore, the communication partner is different between the upstream direction and the downstream direction. When the 10 / 1G-EPON ONU 514 receives the MPCP discovery gate message via the 10 / 10G-EPON OLT 508, it transmits the MPCP register request message directly to the 1G-EPON OLT 501, and registers its own ONU information.

  When transmitting uplink data, the 10 / 1G-EPON ONU 514 directly transmits an MPCP report message to the 1G-EPON OLT 501 to request data transmission. Then, the MPCP gate message for data transmission timing control to the 10 / 1G-EPON ONU 514 transmitted from the 1G-EPON OLT 501 is transmitted to the 10 / 1G-EPON ONU 514 via the 10 / 10G-EPON OLT 508.

(Sixth embodiment)
FIG. 6 is a conceptual diagram schematically illustrating a configuration outline of a communication system 600 according to the sixth embodiment. In the sixth embodiment, the subscriber terminal information for performing data transfer processing is registered based on the data transmission capability information of the subscriber terminal notified from the subscriber terminal and the data reception capability information of the subscriber terminal. A station-side terminal device that transfers only the data traffic of the subscriber terminal will be described.

  The communication system 600 shown in FIG. 6 transmits upstream data of all ONUs on the same line 613 by the timing control unit 602 included in the 1G-EPON OLT 601 having the same function as the 1G-EPON OLT 501 described in FIG. Take control.

  606 shown in FIG. 6 is a 10 / 10G-EPON OLT having the same function as the 10 / 10G-EPON OLT 508 shown in FIG. 5, and does not perform ONU uplink data transmission timing control performed by a normal OLT. In FIG. 6, 610 is a 10 / 10G-EPON ONU, 611 is a 10 / 1G-EPON ONU, and 612 is a 1G-EPON ONU.

  As described above, the 10 / 10G-EPON ONU 610, the 10 / 1G-EPON ONU 611, and the 1G-EPON ONU 612 have completed registration of each ONU information with the 1G-EPON OLT 601 and the 10 / 10G-EPON OLT 606. Yes.

  In FIG. 6, reference numerals 603 and 607 denote data transfer processing units that transfer normal user data traffic other than control messages, and can perform data processing of 1 Gbps and 10 Gbps, respectively.

  The data transfer processing unit 603 that has received the user data traffic from the ONU searches the registration information of the ONU information registration unit 605 for the LLID (Logical Link Identifier) associated with the data traffic, and the ONU that is the transfer source of the data traffic To obtain uplink data transmission capability information.

  Then, the ONU information comparison unit 604 compares the uplink data reception capability (1 Gbps) possessed by the 1G-EPON OLT 601 itself with the data transmission capability information of the ONU obtained from the ONU information registration unit 605.

  When the ONU information comparison unit 604 compares the uplink data reception capability of the 1G-EPON OLT 601 itself with the ONU data transmission capability information obtained from the ONU information registration unit 605, The data transfer processing unit 603 performs this user data traffic transfer process.

  If the ONU information comparison unit 604 compares the uplink data reception capability of the 1G-EPON OLT 601 itself and the ONU data transmission capability information obtained from the ONU information registration unit 605 does not match. This user data traffic is not transferred. In this case, since the transmission / reception speed from the ONU side to the 1G-EPON OLT 601 is different between the two, the 1G-EPON OLT 601 does not normally receive user data traffic.

  Also, the data transfer processing unit 607 that has received the user data traffic from the ONU searches the registration information of the ONU information registration unit 609 for the LLID (Logical Link Identifier) associated with the data traffic, and is the transfer source of the data traffic. The upstream data transmission capability information of the ONU is obtained.

  Then, the ONU information comparison unit 608 compares the uplink data reception capability possessed by the 10 / 10G-EPON OLT 606 itself with the data transmission capability information of the ONU obtained from the ONU information registration unit 609.

  When the ONU information comparison unit 608 compares the uplink data reception capability of the 10 / 10G-EPON OLT 606 itself with the data transmission capability information of the ONU obtained from the ONU information registration unit 609. The data transfer processing unit 607 performs the transfer process of the user data traffic.

  In addition, when the ONU information comparison unit 608 compares the uplink data reception capability of the OLT itself with the data transmission capability information of the ONU obtained from the ONU information registration unit 609, this user Do not forward data traffic. In this case, since the transmission / reception speeds from the ONU side to the 10 / 10G-EPON OLT 606 are different from each other, the 10 / 10G-EPON OLT 606 does not normally receive user data traffic.

  For example, in the case of 10 / 10G-EPON OLT 606, when user data traffic is received from 10 / 10G-EPON ONU 610, the upstream data of the ONU is obtained from the information of 10 / 10G-EPON ONU 610 registered in ONU information registration unit 609. Recognize that the sending capability is 10 Gbps.

  Further, since the uplink data reception capability of the 10 / 10G-EPON OLT 606 is 10 Gbps, the data traffic received by the 10 / 10G-EPON OLT 606 from the 10 / 10G-EPON ONU 610 is the data included in the 10 / 10G-EPON OLT 606. The transfer processing unit 607 performs transfer.

  However, if the ONU uplink data transmission capability does not match the uplink data reception capability (10 Gbps) of the 10 / 10G-EPON OLT 606, the data is not transferred.

(Seventh embodiment)
FIG. 7 is a conceptual diagram schematically illustrating an outline of a configuration of a communication system 700 according to the seventh embodiment. In the seventh embodiment, in a shared access communication system in which a plurality of subscriber terminals and a station-side terminal device that controls data transmission timing of the subscriber terminals are connected, data held in a transmission waiting buffer The subscriber terminal that calculates the data transfer time based on the amount and its own data transmission capability information and notifies the station end device of the data transfer time will be described.

  Note that the 1G-EPON OLT 701 and the 10G / 10G-EPON OLT 703 have functions corresponding to the 1G-EPON OLT 601 and the 10 / 10G-EPON OLT 606 described in the sixth embodiment, respectively.

  In FIG. 7, reference numeral 701 denotes 1G-EPON OLT. The 1G-EPON OLT 701 includes a timing control unit 702 that controls the data transmission timing in the upstream direction from all ONUs to the OLT side via the same line 709.

  Reference numeral 703 denotes a 10G / 10G-EPON OLT. The 10G / 10G-EPON OLT 703 does not adjust and control the upstream data transmission timing of the ONU performed by the normal OLT. In FIG. 7, 704 is a 10G / 10G-EPON ONU, 707 is a 10 / 1G-EPON ONU, and 708 is a 1G-EPON ONU.

  Conventional ONUs of 1G-EPON and 10G-EPON notify the corresponding OLT of the amount of data stored in the upstream data buffer from itself and make a data transmission request, and the corresponding OLT responds to the data transmission request with data. A transmission time is assigned to each ONU. However, for example, when there is the same request that the data accumulation amount = 1,000 bytes from the 1G-EPON ONU and the 10G-EPON ONU, the transfer speed differs between the 1G-EPON ONU and the 10G-EPON ONU. The transmission time allocated to each ONU by the corresponding OLT is a different numerical value.

  Since the communication system 700 notifies the time required for transfer on the ONU side and makes a request to the OLT side, the OLT side does not need to manage the transfer capability of the ONU and calculate the allocation time for data transmission.

  As illustrated in FIG. 7, the 10G / 10G-EPON ONU 704 includes a transfer time calculation unit 705 that calculates a time required for actual transfer based on the amount of data to be transmitted stored in the data storage unit 706. Then, the 10G / 10G-EPON ONU 704 notifies the 10G / 10G-EPON OLT 703 of the actual transfer time calculated by the transfer time calculation unit 705. Further, the 10G / 10G-EPON OLT 703 transfers the transfer time notified from the 10G / 10G-EPON ONU 704 to the 1G-EPON OLT 701.

  For example, when the data accumulation amount is 1,000 bytes, the uplink transfer capability is 10.3125 Gbps, so (transfer time) = 1,000 × 8 ÷ (10.3125 × 10 ^ 9) = 776 ns can be calculated. . The 1G-EPON OLT 701 assigns a transfer time to each ONU based on the notified data transfer time. Therefore, the 1G-EPON OLT 701 does not need to manage the upstream data transmission capability of each ONU and does not need to calculate the transfer time for each ONU.

  As for the 10 / 1G-EPON ONU 707 and the 1G-EPON ONU 708, similarly to the above-described 10G / 10G-EPON ONU 704, the uplink data transfer time is calculated and notified to the corresponding OLT.

(Eighth embodiment)
FIG. 8 is a conceptual diagram for schematically explaining a configuration outline of a communication system 800 according to the eighth embodiment. In the eighth embodiment, when notifying the data amount information to be transmitted to the station-side terminal device that determines and controls the data transmission timing of the subscriber terminal, the data reception capability information of the station-side terminal device and itself The subscriber terminal that calculates the transmission data amount information to be notified from the data transmission capability information and the actual data amount held in the transmission waiting buffer will be described.

  In FIG. 8, 801 is 1G-EPON OLT. The 1G-EPON OLT 801 includes a timing control unit 802. The timing control unit 802 adjusts and controls the uplink data transmission timing from all ONUs on the same line 809 to the OLT.

  In FIG. 8, reference numeral 803 denotes a 10G / 10G-EPON OLT. The 10G / 10G-EPON OLT 803 does not adjust / control the uplink data transmission timing from the ONU to the OLT performed by the normal OLT. In FIG. 8, 804 is a 10G / 10G-EPON ONU, 807 is a 10 / 1G-EPON ONU, and 808 is a 1G-EPON ONU.

  Further, the 10G / 10G-EPON ONU 804 includes a notification data amount calculation unit 805 that corrects the actual data amount to be transmitted included in the data storage unit 806 to the correction data amount notified to the corresponding OLT.

  As described above, the 1G-EPON OLT 801 communicates with the 10G / 10G-EPON ONU 804 and the 10 / 1G-EPON ONU 807 that cannot communicate directly with each other via the 10G / 10G-EPON OLT 803, and data Sending timing can be adjusted and controlled.

  However, since the 1G-EPON OLT 801 is an OLT originally designed for adjusting and controlling only the 1G-EPON ONU, it is not compatible with the 10G-EPON ONU having a communication speed of 10G. . For this reason, even if the MPCP report message is received from the 10G / 10G-EPON ONU 804 or the 10 / 1G-EPON ONU 807 and the accumulated amount of uplink data of each ONU is notified, the 1G-EPON OLT 801 considers the speed of 10 Gbps. It may be difficult to assign the data transmission time.

  In the present embodiment, when each ONU notifies the OLT of the data accumulation amount, the data amount to be actually notified is calculated from the ONU's own uplink data transmission capability and the OLT's uplink transfer capability. As a result, the OLT can allocate the data transmission time without considering the transfer capability of each ONU.

  In FIG. 8, for example, a case where the data storage unit 806 provided in the 10G / 10G-EPON ONU 804 holds 3000 bytes of transmission data will be described. When the 10G / 10G-EPON ONU 804 notifies the 1G-EPON OLT 801 via the 10G / 10G-EPON OLT 803 via the 10G / 10G-EPON OLT 803, if the 3,000-byte data storage amount is notified as it is by the MPCP report message, Since 10G-EPON is not supported, the notified 3,000 bytes are calculated assuming that the communication speed of 1G-EPON ONU (uplink speed = 1.25 Gbps).

  In this case, the 1G-EPON OLT 801 calculates the data transmission time allocated to the 10G / 10G-EPON ONU 804 as 3,000 × 8 ÷ (1.25 × 10 9) = 19.2 μsec. However, in practice, the 10G / 10G-EPON ONU 804 transmits at an uplink communication speed of 10 Gbps (uplink speed = 10.3125 Gbps). Therefore, the transfer time actually required by the 10G / 10G-EPON ONU 804 is 3,000 × 8 ÷ (10.3125 × 10 ^ 9) = 2.33 μsec, and the data transmission time allocated from the OLT side, There will be a difference between the actual data transmission time.

  The 10G / 10G-EPON ONU 804 of the communication system 800 is the data that 1G-EPON OLT 801 needs in reality from the 1.25 Gbps uplink speed of 1G-EPON OLT 801 and its own uplink speed of 10.3125 Gbps. The data storage amount corrected so that the transmission time can be calculated is calculated, and this correction data storage amount is notified to the OLT side by the MPCP report message.

  For example, when the data storage unit 806 has a data storage amount of 3,000 bytes, the notification data amount calculation unit 805 calculates 3000 × (1.25 × 10 ^ 9) ÷ (10.3125 × 10 ^ 9) The calculation of 364 bytes is performed, and the correction data accumulation amount to be notified to the OLT side is calculated to be 364 bytes.

  As described above, the 1G-EPON OLT 801 notified of the corrected data accumulation amount of 364 bytes is 364 × 8 ÷ 1.25 × as in the case of calculating the data transmission time allocated to the 1G-EPON ONU. What is necessary is just to calculate as 10 ^ 9 = 2.33 microseconds. Therefore, the timing control unit 802 assigns 2.33 μsec as the data transmission time for the 10G / 10G-EPON ONU 804. Therefore, the 1G-EPON OLT 801 is appropriate to perform 2.33 microseconds, which is actually required for data transmission by the 10G / 10G-EPON ONU 804, by performing a conventional calculation process based on the notified correction data accumulation amount. Can be calculated and assigned.

  As described above, according to the eighth embodiment, the OLT need not consider the uplink line speed of each ONU when allocating the data transmission time from the plurality of ONUs to the OLT to each ONU. Therefore, even in a system configuration in which 1G-EPON OLT 801 that does not support 10G-EPON ONU 804 is connected by the same line 809 as illustrated in communication system 800, the data transmission of 10G-EPON ONU 804 can be adjusted and controlled. It becomes possible.

  That is, in the communication system 800 described above, when a plurality of transmission apparatuses having different communication speeds of 10 Gbps and 1 Gbps are arranged on the OLT side and the ONU side, respectively, and the OLT side and the ONU side are connected by the same line. Also, any one main OLT adjusts and controls the data transmission timing from each ONU.

  For this reason, the main OLT obtains the data accumulation amount notified from the ONU to other OLTs, and the main OLT allocates data transmission timings for all ONUs at once. Further, the different speed ONU having an upstream communication speed different from the upstream communication speed of the main OLT among all ONUs corrects the data accumulation amount to be notified in accordance with the default upstream communication speed of the main OLT. Then, the different speed ONU notifies the corrected correction data accumulation amount to the main OLT via the OLT having the same uplink communication speed.

  By such processing, the main OLT can appropriately allocate the data transmission time by calculating the data transmission time based on the default uplink communication speed of the main OLT, in other words, without making any change on the OLT side. It becomes.

(Ninth embodiment)
FIG. 9 is a conceptual diagram schematically illustrating an outline of the configuration of the communication network system 900 according to the ninth embodiment. In FIG. 9, the 1G-EPON OLT 901 includes a timing control unit 902. In addition, the timing control unit 902 adjusts and controls the upstream data transmission timing of all ONUs 904, 905, and 906 on the same line 909.

  Further, in the communication network system 900, the 10 / 10G-EPON OLT 903 may not have the function of adjusting and controlling the upstream data transmission timing of the ONU, which is one of the functions of the normal OLT. Further, 904 is a 10 / 10G-EPON ONU, 905 is a 10 / 1G-EPON ONU, and 906 is a 1G-EPON ONU. Reference numeral 907 denotes a communication device such as a layer 2 switch or a router, which relays communication between the OLTs 901 and 903 and the upper network 908 by data transfer or the like.

  In the ninth embodiment, by applying the communication system 500 of the fifth embodiment described above, the data transmission timing of each ONU is all adjusted and controlled by the 1G-EPON OLT 901. Regarding the transfer of user data traffic, 10 / 10G-EPON OLT 903 is responsible for 10 Gbps line data traffic, and 1 G-EPON OLT 901 is responsible for 1 Gbps line data traffic.

  For this reason, the data communication of 10 / 10G-EPON ONU 904 is all handled by 10 / 10G-EPON OLT 903, and the data communication of 1G-EPON ONU 905 is all transferred by 1G-EPON OLT 901.

  However, for the 10 / 1G-EPON ONU 905, the uplink speed is 1 Gbps and the downlink speed is 10 Gbps. Therefore, the 1G-EPON OLT 901 is responsible for transfer processing in the uplink direction, and the 10 / 10G-EPON OLT 903 is in the downlink direction. Will be in charge of the transfer process. That is, for the 10 / 1G-EPON ONU 905, different communication paths are used for the forward and return paths of data communication. Normally, the communication device 907 performs processing of returning to the original transmission path when selecting the return path of communication data. However, in the case of the communication network system 900, different communication data are mixed in the forward path and the return path as described above. For this reason, there may be a problem that it becomes impossible to know which route the return route data should be transferred to.

  As an example for solving this problem, the communication network system 900 employs the means described below. The 10 / 10G-EPON OLT 903 and the 1G-EPON OLT 901 recognize the downlink / uplink line speed of each ONU from the ONU registration information by the MPCP register request message from each ONU. The 10 / 10G-EPON OLT 903 and the 1G-EPON OLT 901 obtain the forward / return information of the communication data from the recognized downlink / uplink speed.

  When both OLTs 901 and 903 receive communication data from the respective ONUs 904, 905 and 906 and transfer them to the communication device 907, the OLTs 901 and 903 add the return path information to the communication data itself and transfer it.

  When the communication device 907 receives the communication data including the return route information, the communication device 907 records and stores the return route information in addition to the communication data information such as the address, identifier, and protocol number of the communication data, and then sends it to the upper network 908. And forward.

  Thereafter, when data serving as a response to the communication data is received from the upper network 908, the return route information is extracted from the stored information based on information such as the address, identifier, and protocol number of the communication data, and the communication data is transmitted in the return route direction. Shall be transferred. Through the processing described above, the communication device 907 can appropriately select the return path of the communication data without grasping or managing the line speed information of each ONU.

  In the first to ninth embodiments described above, even when a 10G-EPON is additionally provided on the OLT side, typically in the 1G-EPON of the shared access communication system, communication can be performed smoothly. Can provide a simple communication system.

  Further, each communication device such as the communication system or the shared access communication system described in the first to ninth embodiments described above is not limited to the one individually provided with the configuration described in each embodiment. That is, each communication device is a communication device provided with any combination of the configurations described in each embodiment as appropriate, corresponding to a required processing function, and a communication device that performs operations and processes based on the provided configuration. it can. Typically, the communication device has all the configurations and functions described in the first to ninth embodiments, and all the operations and operations described in the first to ninth embodiments. It is good also as a communication apparatus which processes. In addition, each communication device such as the communication system or the shared access communication system described in the first embodiment to the ninth embodiment described above may be used by appropriately changing the configuration within the obvious range. You may change and use the operation | movement and a process suitably in the range.

  101... Upper communication device, 103... Lower communication device, 110... Same communication line.

Claims (14)

In a composite shared access communication system in which a plurality of subscriber terminals and one station side device are connected in many-to-one connection, a plurality of shared terminals are connected on the same line.
A compound shared access communication system, wherein a predetermined one of the station side devices controls data transmission timings of all the subscriber terminals. The composite shared access communication system according to claim 1 ,
The station-side device, when notifying the subscriber terminal of data transmission timing, notifies the subscriber terminal via another station-side device, and controls the data transmission timing of the subscriber terminal. Access communication system. A station apparatus of the composite shared access communication system according to claim 1 or 2 ,
When notifying data transmission timing to the subscriber terminal that cannot communicate directly with the station side device, the subscriber terminal is notified of the data transmission timing to be notified via another station side device capable of direct communication with the subscriber terminal. And controlling the data transmission timing of the subscriber terminal. A station-side device of a composite shared access communication system. A station apparatus of the composite shared access communication system according to claim 1 or 2 ,
Composite shared access communication characterized in that a data transmission timing is notified from the station side device that controls data transmission timing of the subscriber terminal, and the data transmission timing is transferred to the subscriber terminal capable of direct communication. The station side device of the system. In a composite shared access communication system in which a plurality of subscriber terminals and one station side device are connected in many-to-one connection, a plurality of shared terminals are connected on the same line.
A predetermined one of the station side devices controls the data transmission timing of all the subscriber terminals,
Each of the station side devices that has received the data transmission request message from the subscriber terminal transfers the received data transmission request message to the predetermined one station side device. A station side apparatus of the composite shared access communication system according to claim 5 ,
When the data transmission request message is received from the subscriber terminal capable of direct communication, the received data transmission request message is transferred to the predetermined one station side device. A station side device of a communication system. A station side apparatus of the composite shared access communication system according to claim 5 ,
A data transmission request message transmitted from the subscriber terminal that cannot be directly communicated is transferred from another station side device capable of direct communication with the subscriber terminal, and the direct transmission is performed based on the transferred data transmission request message. A station apparatus for a composite shared access communication system, characterized by controlling data transmission timing of a subscriber terminal that cannot communicate. In a composite shared access communication system in which a plurality of subscriber terminals and one station side device are connected in many-to-one connection, a plurality of shared terminals are connected on the same line.
A predetermined one of the station side devices controls the data transmission timing of all the subscriber terminals,
The composite shared access communication system, wherein the station side device that has received a registration message including subscriber information from the subscriber terminal transfers the received registration message to the predetermined one station side device. The station side apparatus of the composite shared access communication system according to claim 8 ,
When a registration message is received from the subscriber terminal capable of direct communication, the registration information of the subscriber terminal that has transmitted the registration message is stored, and the registration message is transferred to the predetermined one station apparatus. A station-side device of a composite shared access communication system. The station side apparatus of the composite shared access communication system according to claim 8 ,
Based on the registration message of the subscriber terminal transferred from another station side device capable of direct communication with the subscriber terminal, the registration information of the subscriber terminal that cannot perform direct communication is stored. A station side device of a composite shared access communication system. The station apparatus of the composite shared access communication system according to any one of claims 2 , 5, and 8 ,
Determining whether or not to forward the data traffic of the subscriber terminal based on the data transmission capability information notified from the subscriber terminal and the data reception capability information of the local station side device; Side device. In a subscriber terminal of a shared access communication system,
In the shared access communication system, a plurality of the subscriber terminals and a station side device that controls data transmission timing of the subscriber terminals are connected,
The subscriber terminal calculates a data transfer time based on the data amount held in the data transmission waiting buffer and the data transmission capability information, and notifies the station side device of the calculated data transfer time. A subscriber terminal of a shared access communication system characterized by the above. A subscriber terminal of the composite shared access communication system according to claim 2 or 5 ,
When the predetermined amount of data to be transmitted by the subscriber terminal is notified to the predetermined one station side device, the data reception capability information of the station side device, the data transmission capability information of the subscriber terminal, and a transmission waiting buffer A subscriber terminal of a composite shared access communication system, characterized in that a real data amount held and a transmission data amount to be notified are calculated from the data amount, and the calculated correction data amount is notified. A shared access communication system in which a plurality of subscriber terminals and one station-side device are connected in many-to-one manner is a predetermined one station-side device in a composite shared access communication system in which a plurality of connections are made on the same line,
A station-side apparatus of a composite shared access communication system comprising a timing control unit that controls data transmission timing of all subscriber terminals in the composite shared access communication system.

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