JP2017050775A - PON system and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a time required for PON dynamic band allocation, with a low uplink transmission delay.SOLUTION: A base station device 21 generates radio scheduling information to instruct transmission timing to each subordinate UE 29, and on receiving a transmission request from a UE 29, transmits radio scheduling information corresponding to the UE 29, to the UE 29 which transmits the transmission request and an ONU (Optical Network Unit) 17. When receiving from the base station device 21 radio scheduling information corresponding to the UE29 which transmits the transmission request, the ONU transmits transmission timing information and data amount information to OLT according to magnitude relationship between a PON polling period and a radio scheduling information arrival interval, using a time slot allocated by the dynamic band allocation or a time slot allocated by fixed band allocation.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a technique for realizing optical fiber transmission, and more particularly to a PON system and a communication method.

  In recent years, the area (cell) covered by a base station apparatus has become narrower as the speed of a radio access network provided by a mobile communication network has been reduced. Has increased. For this reason, a passive optical network (PON) system in which a single optical transmission line is shared by a plurality of subscribers has been studied as a network for accommodating a plurality of base station apparatuses.

  In the PON system, one optical transmission line terminal (OLT: Optical Line Terminal) installed at a telecommunications carrier's station connects to multiple subscriber-side terminals (ONU: Optical Network Unit) via an optical splitter. Has been. The OLT achieves high band utilization efficiency by dynamically allocating an upstream band to a plurality of ONUs, for example, 64 ONUs, by time division multiplexing (TDMA).

  In future base station equipment and applications such as M2M (Machine-to-Machine), it is necessary to keep the transmission delay of the access network within 1 millisecond, but in the TDMA-based PON system where uplink transmission is between OLT and ONU Due to the control of Dynamic Bandwidth Allocation (DBA), a delay of the order of several milliseconds at maximum occurs, so that it is difficult to apply to the above application.

  Here, as a method for efficiently transmitting uplink data in the PON section, Patent Document 1 discloses a method for reliably assigning at least a contracted fixed band as a transmission permission band to an ONU that has a fixed band contract. It is shown.

JP 2011-146780 A

  However, in the technique described in Patent Document 1, since a fixed bandwidth is allocated to a specific ONU, the bandwidth cannot be used by other ONUs even in a situation where communication is not actually performed. Usage efficiency will deteriorate. Moreover, in other ONUs to which no fixed bandwidth is allocated, there is a possibility that a large delay or packet loss occurs. For this reason, a technique for transmitting packets from a specific radio base station with a low delay without reducing the bandwidth utilization efficiency of the PON is required.

  The present invention has been made in view of such circumstances, and provides a PON system and a communication method capable of reducing the time required for PON dynamic bandwidth allocation and reducing the delay of uplink transmission. Objective.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the PON system of the present invention is a PON (Passive Optical Network) that realizes optical fiber transmission of point-to-multipoint connection between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units). ) In the system, the control station device under the control of the ONU creates scheduling information for instructing the transmission timing for each terminal device of the communication destination, and when the transmission request is received from any of the terminal devices, the transmission A communication apparatus that includes a scheduling information generation / transmission unit that transmits scheduling information corresponding to the terminal apparatus that has transmitted the transmission request to the terminal apparatus and ONU that transmitted the request, and the ONU performs communication with the OLT and the control station apparatus, respectively. Schedule corresponding to the terminal device that sent the transmission request from the interface and the control station device A signal transmission unit that transmits the received scheduling information to the OLT using a slot selected according to a magnitude relationship between a PON polling period and a scheduling information arrival interval or a predetermined slot when receiving ringing information; It is characterized by providing.

  Thus, when the control station apparatus receives a transmission request from any terminal apparatus, the control station apparatus transmits scheduling information corresponding to the terminal apparatus that transmitted the transmission request to the terminal apparatus and ONU that transmitted the transmission request, When the ONU receives scheduling information corresponding to the terminal device that has transmitted the transmission request from the control station device, the ONU selects a slot selected according to the magnitude relationship between the PON polling period and the scheduling information arrival interval or a predetermined slot. Since the received scheduling information is transmitted to the OLT, the PON and the base station can be coordinated, and dynamic bandwidth allocation can be started early on the PON side. As a result, it is possible to reduce the delay of uplink transmission.

  (2) In the PON system of the present invention, when the PON polling period is equal to or less than the scheduling information arrival interval, the signal transmission unit dynamically transmits transmission timing information and data amount information included in the scheduling information. It transmits to OLT using the slot allocated by the band allocation, It is characterized by the above-mentioned.

  As described above, when the PON polling period is equal to or shorter than the scheduling information arrival interval, the transmission timing information and the data amount information included in the scheduling information are transmitted to the OLT using the slot allocated by the dynamic band allocation. Therefore, dynamic band allocation on the PON side can be started at an early stage, and the delay of uplink transmission can be reduced.

  (3) In the PON system of the present invention, when the PON polling period is larger than the scheduling information arrival interval, the signal transmission unit assigns the transmission timing information and the data amount information included in the scheduling information to a fixed bandwidth allocation. It transmits to OLT using the slot allocated by (4).

  As described above, when the PON polling period is larger than the scheduling information arrival interval, the transmission timing information and the data amount information included in the scheduling information are transmitted to the OLT using the slot allocated by the fixed bandwidth allocation. It is possible to quickly transmit the transmission timing information and the data amount information to the OLT while executing the target bandwidth allocation.

  (4) In the PON system of the present invention, the signal transmission unit may report the scheduling information itself or transmission timing information and data amount information included in the scheduling information corresponding to a Gate signal received from the OLT. The signal is encapsulated and transmitted to the OLT.

  In this way, the scheduling information itself, or transmission timing information and data amount information included in the scheduling information, are encapsulated into a Report signal corresponding to the Gate signal received from the OLT and transmitted to the OLT. While executing, it becomes possible to quickly transmit the transmission timing information and the data amount information to the OLT.

  (5) In the PON system of the present invention, the OLT reads transmission timing information and data amount information included in a Report signal received from the ONU.

  As described above, since the transmission timing information and the data amount information included in the Report signal received from the ONU are read, it is possible to quickly acquire the transmission timing information and the data amount information while executing the dynamic band allocation. .

  (6) Further, the PON system of the present invention is a PON (Point to Multi Point) optical fiber transmission between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units). When the control station device under the control of the ONU creates scheduling information for instructing the transmission timing for each communication destination terminal device and receives a transmission request from one of the terminal devices A communication information interface comprising: a scheduling information generating / transmitting unit that transmits scheduling information corresponding to the terminal device that transmitted the transmission request to the terminal device and ONU that transmitted the transmission request; and the OLT communicates with each ONU And receives scheduling information from the ONU and is transmitted from the PON polling cycle and each ONU. Characterized in that it and a bandwidth allocation unit that allocates the upstream bandwidth of each ONU selected slot or predetermined slot according to the magnitude relationship between the scheduling information reaches interval end device.

  In this manner, the OLT receives scheduling information from the ONU, and selects a slot selected according to the magnitude relationship between the PON polling period and the scheduling information arrival interval of the terminal device transmitted from each ONU or a predetermined slot. Since it is allocated to the upstream band of the ONU, it is possible to quickly acquire transmission timing information and data amount information while executing dynamic band allocation.

  (7) In the PON system of the present invention, the communication interface receives the scheduling information in a slot allocated by dynamic bandwidth allocation if the PON polling period is equal to or less than the scheduling information arrival interval, while the PON polling If the period is larger than the scheduling information arrival interval, the scheduling information is received in a slot allocated by fixed band allocation.

  As described above, in the OLT, if the PON polling period is equal to or less than the scheduling information arrival interval, the scheduling information is received in the time slot allocated by dynamic bandwidth allocation, while the PON polling period is larger than the scheduling information arrival interval. For example, since the scheduling information is received in a time slot allocated by fixed bandwidth allocation, it is possible to quickly acquire transmission timing information and data amount information while performing dynamic bandwidth allocation.

  (8) Further, the communication method of the present invention is a PON (Point to Multi Point) optical fiber transmission between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units). A communication method of a Passive Optical Network) system, in a control station device under the control of an ONU, a step of creating scheduling information for instructing transmission timing for each communication destination terminal device, and transmission from any of the terminal devices When the request is received, a step of transmitting scheduling information corresponding to the terminal device that transmitted the transmission request to the terminal device and ONU that transmitted the transmission request, and the ONU communicates with the OLT and the control station device, respectively. And a schedule corresponding to the terminal device that has transmitted the transmission request from the control station device. When receiving information, at least a step of transmitting the received scheduling information to the OLT using a slot selected according to a magnitude relationship between a PON polling period and a scheduling information arrival interval or a predetermined slot is included. It is characterized by that.

  Thus, when the control station apparatus receives a transmission request from any terminal apparatus, the control station apparatus transmits scheduling information corresponding to the terminal apparatus that transmitted the transmission request to the terminal apparatus and ONU that transmitted the transmission request, When the ONU receives scheduling information corresponding to the terminal device that has transmitted the transmission request from the control station device, the ONU selects a slot selected according to the magnitude relationship between the PON polling period and the scheduling information arrival interval or a predetermined slot. Since the received scheduling information is transmitted to the OLT, the PON and the base station can be coordinated, and dynamic bandwidth allocation can be started early on the PON side. As a result, it is possible to reduce the delay of uplink transmission.

  (9) Further, the communication method of the present invention is a PON (Point to Multi Point) optical fiber transmission between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units). A communication method of a Passive Optical Network) system, in a control station device under the control of an ONU, a step of creating scheduling information for instructing transmission timing for each communication destination terminal device, and transmission from any of the terminal devices When receiving a request, a step of transmitting scheduling information corresponding to the terminal device that transmitted the transmission request to the terminal device and ONU that transmitted the transmission request, a step of communicating with each ONU in the OLT, Receive scheduling information from the ONU, and the PON polling cycle and the terminal device sent from each ONU Assigning a scheduling information arrival period with the selected slot or predetermined slots in accordance with the magnitude of the upstream bandwidth of each ONU, characterized in that it comprises at least a.

  In this manner, the OLT receives scheduling information from the ONU, and selects a slot selected according to the magnitude relationship between the PON polling period and the scheduling information arrival interval of the terminal device transmitted from each ONU or a predetermined slot. Since it is allocated to the upstream band of the ONU, it is possible to quickly acquire transmission timing information and data amount information while executing dynamic band allocation.

  According to the present invention, it is possible to reduce the time required for PON dynamic band allocation and reduce the delay of uplink transmission.

It is a figure which shows the outline | summary of the PON system which concerns on this embodiment. It is a sequence chart which shows an example of communication between ONU and OLT. It is a figure which shows the conventional operation | movement in a PON system. It is a figure which shows operation | movement of this embodiment in a PON system. It is a figure which shows schematic structure of OLT of the PON system in Example 1. FIG. It is a figure which shows schematic structure of ONU of the PON system in Example 1. FIG. It is a figure which shows schematic structure of BBU (base station apparatus) of the PON system in Example 1. FIG. It is a sequence chart which shows the flow of the signal from UE to OLT in a PON system. It is a sequence chart which shows the flow of the signal from UE to OLT in a PON system. FIG. 10 is a diagram illustrating a schematic configuration of an OLT of a PON system according to a third embodiment. It is a figure which shows schematic structure of ONU of the PON system in Example 3. FIG. It is a figure which shows BBU (base station apparatus) schematic structure of the PON system in Example 3. FIG. It is a figure which shows schematic structure of OLT of the PON system in Example 5. FIG. It is a figure which shows schematic structure of ONU of the PON system in Example 5. FIG. It is a figure which shows BBU (base station apparatus) schematic structure of the PON system in Example 5. FIG. It is a sequence chart which shows the flow of the signal from UE to OLT in a PON system. It is a sequence chart which shows the flow of the signal from UE to OLT in a PON system. FIG. 10 is a diagram illustrating a schematic configuration of an OLT of a PON system according to a seventh embodiment. FIG. 10 is a diagram illustrating a schematic configuration of an ONU of a PON system according to a seventh embodiment. FIG. 10 is a diagram illustrating a schematic configuration of a BBU (base station apparatus) of a PON system according to a seventh embodiment. It is a sequence chart which shows the flow of the signal from UE to OLT in a PON system.

  In the TDMA-based PON system, the inventors pay attention to the fact that a delay of the order of several milliseconds at maximum occurs due to the control of the dynamic bandwidth allocation between the OLT and the ONU, and cooperates between the PON and the base station apparatus. As a result, the wireless scheduling information transmitted from the base station apparatus to the mobile station apparatus is also transmitted to the ONU side, thereby finding that the dynamic band allocation procedure can be started at an early stage, and the present invention has been achieved. .

  That is, the PON system of the present invention is a PON (Passive Optical Network) that realizes optical fiber transmission of point-to-multipoint connection between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units). ) In the system, the control station device under the control of the ONU creates scheduling information for instructing the transmission timing for each terminal device of the communication destination, and when the transmission request is received from any of the terminal devices, the transmission A communication apparatus that includes a scheduling information generation / transmission unit that transmits scheduling information corresponding to the terminal apparatus that has transmitted the transmission request to the terminal apparatus and ONU that transmitted the request, and the ONU performs communication with the OLT and the control station apparatus, respectively. Schedule corresponding to the terminal device that sent the transmission request from the interface and the control station device A signal transmission unit that transmits the received scheduling information to the OLT using a slot selected according to a magnitude relationship between a PON polling period and a scheduling information arrival interval or a predetermined slot when receiving ringing information; It is characterized by providing.

  As a result, the present inventors can cooperate with the PON and the base station, and at the PON side, it is possible to start dynamic bandwidth allocation at an early stage, and as a result, it is possible to reduce the delay of uplink transmission. It was. Embodiments of the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is a diagram showing an outline of a PON system according to the present embodiment. In this PON system, a plurality of ONUs 17-1 to 17-n are connected to an OLT 13 connected to the Internet 11 via an optical splitter 15. The ONU 17-1 is connected to an HGW (Home Gateway) 19 and communicates with the UE 27. In addition, base station apparatuses 21-1 to 21-5 including BBUs (Base Band Units) and RRHs (Remote Radio Heads) are connected to the ONUs 17-2 to 17-n, and the UEs 29-1 to 29-1 are under control. Wireless communication with 29-3 is performed. As illustrated in FIG. 1, wireless communication between the base station devices 21-1 to 21-5 and the UEs 29-1 to 29-3 is performed by a 3G, 4G, 5G, or the like method. Here, the base station apparatus or the HGW constitutes a control station apparatus, and the UE (mobile station apparatus) constitutes a terminal apparatus. The communication between the control station device and the terminal device will be described by taking wireless communication as an example in this specification. However, the present invention is not limited to this, and the communication between the two may be wired communication. good.

  FIG. 2 is a sequence chart illustrating an example of communication between the ONU and the OLT. Here, any one of the ONUs is indicated as 17. First, when a frame (data frame) reaches the ONU 17 (step S1), the frame is accumulated in the buffer until the transmission timing of the ONU 17. The OLT 13 transmits a GATE signal indicating transmission permission to the ONU 17 (step S2). When the ONU 17 receives the GATE signal, the OLT 13 transmits a corresponding REPORT signal to the OLT 13 (step S3) to notify the buffer amount. Next, the OLT 13 transmits a GATE signal for notifying the transmission timing to the ONU 17 (step S4), and the ONU 17 transmits a REPORT signal as a response (step S5) to notify the buffer amount. Next, the ONU 17 transmits a frame (step S6).

  FIG. 3 is a diagram showing a conventional operation in the PON system. When the UE 29 requests the base station apparatus 21 to transmit DATA, the BBU 23 of the base station apparatus 21 transmits “radio scheduling information” as scheduling information to the UE 29, and DATA is transmitted from the UE 29 to the ONU 17. The ONU 17 receives the GATE signal from the OLT 13 and transmits a REPORT signal as a response to the ONU 17, thereby executing dynamic bandwidth allocation in the PON. When dynamic bandwidth allocation is performed, the ONU 17 transmits the DATA stored in the buffer to the OLT 13. In FIG. 3, the radio scheduling time is (1), the dynamic bandwidth allocation time between the ONU and the OLT is (2), the time for transmitting DATA from the UE to the ONU is (3), and the ONU to the OLT Assuming that the time to transmit the DATA until (4), the delay time has a size of “(1) + (2) + (3) + (4)”.

  FIG. 4 is a diagram showing the operation of this embodiment in the PON system. When the UE 29 requests the base station apparatus 21 to transmit DATA, the BBU 23 of the base station apparatus 21 transmits radio scheduling information to the UE 29. At the same time, the wireless scheduling information is also transmitted to the ONU 17. Here, the BBU 23 may transmit the wireless scheduling information to the UE 29 and simultaneously transmit the wireless scheduling information to the ONU 17, but it does not necessarily have to be simultaneous. When receiving the wireless scheduling information, the ONU 17 transmits the transmission timing information and the data amount information included in the wireless scheduling information to the OLT 13 together with the REPORT signal corresponding to the first GATE signal received from the OLT 13. Thereby, dynamic bandwidth allocation is started at an early stage, and DATA that reaches the ONU 17 can be transmitted to the OLT 13 at an early stage. Accordingly, in FIG. 4, when the time of radio scheduling is (1), the time of dynamic bandwidth allocation between the ONU and the OLT is (3), and the time for transmitting DATA from the ONU to the OLT is (4). The delay time can be shortened to “(1) + (3) + (4)”.

  The functions of the PON system according to this embodiment are summarized as follows.

  When transmitting radio scheduling information exchanged between a BBU (Base Band Unit) and a UE (User Equipment) from the BBU to the UE, the radio scheduling information is also transmitted to the ONU side. In the following description, BBU and RRH may be combined into a base station apparatus.

  The radio scheduling information transmitted to the ONU side includes timing information (adjusted to the timing at which the signal from the UE is received by the BBU) converted into the timing actually received by the ONU and the amount of transmission data. Here, the delay time between the BBU and the ONU is also considered as necessary.

  A function of reading scheduling information by dividing only wireless scheduling information by ONU or OLT (differentiated by VLAN, COS, TOS, etc.). Here, when the wireless scheduling information is grasped by the ONU, when the ONU notifies the OLT of the accumulated data amount, the ONU notifies the data amount considering the wireless scheduling information and the wireless scheduling information. On the other hand, when the radio scheduling information is grasped by the OLT, it is handled in the same way as normal data and is notified to the OLT as a data amount.

  When the ONT bandwidth (DBA) is calculated by the OLT, the transmission timing and data amount requested from the wireless scheduling information are first reflected, and then the remaining bandwidth is allocated to the same ONU and connected to the OLT. Allocate bandwidth to other ONUs.

  When radio scheduling information arrives from a plurality of ONUs to the OLT, the reception timing at the OLT may become the same. That is, even if the transmission timing in each ONU is the same, if the distance to the OLT is different, packet collision in the OLT does not occur, but the timing at which the packet arrives at the OLT may be the same. In such a case, except for one, the timing is adjusted (for example, delayed) on the time axis. Alternatively, using this information as a trigger, the wavelength of the ONU is changed to another wavelength except for one (collision avoidance). Here, when changing the wavelength, the OLT has a function of collectively managing DBAs of respective wavelengths and a function of notifying the wavelength change.

  When the PON polling period is larger than the radio schedule arrival interval, in order to prevent the data from the UE (BBU) from reaching before the ONU bandwidth allocation, a short amount for notifying the data amount and radio scheduling information to the target ONU. Performs a fixed bandwidth allocation for the period. Alternatively, short-period fixed bandwidth allocation is performed for all ONUs targeted for low delay. When assigning a short-band fixed bandwidth to all ONUs targeted for low delay, if there is no transmission permission from the OLT after waiting for a certain period, it is judged that the information did not reach the OLT due to a collision, and is transmitted again with the specified fixed bandwidth .

  Next, each example of the present invention will be described. Note that the wireless scheduling information may be simply referred to as “scheduling information”.

  In the first embodiment, the wireless scheduling information is grasped by the ONU. Further, (PON polling cycle) ≦ (radio scheduling information arrival interval). In addition, when there is a bandwidth request from a plurality of base station devices at the same time, processing is performed on the time axis.

  5A is a diagram illustrating a schematic configuration of the OLT of the PON system according to the first embodiment, FIG. 5B is a diagram illustrating a schematic configuration of the ONU of the PON system according to the first embodiment, and FIG. 5C is a diagram illustrating the configuration according to the first embodiment. It is a figure which shows schematic structure of BBU (base station apparatus) of a PON system. As shown in FIG. 5a, the OLT 131 includes an upper network side interface 131a, an upstream bandwidth allocation unit 131b that prioritizes scheduling information, and bandwidth allocation information notification unit 131c that notifies bandwidth allocation information to each ONU. , And an ONU side interface 131d.

  Further, as shown in FIG. 5b, the ONU 171 transmits an OLT-side interface 171a, a scheduling information reading unit 171b, a data amount notifying unit 171c for notifying the data amount to the OLT considering the scheduling information, and a signal from a predetermined BBU. A signal transmission unit 171d and a lower network side interface 171e. Further, as shown in FIG. 5c, the BBU 211 includes an upper network side interface 211a, a scheduling information generation / transmission unit 211b that generates and transmits scheduling information, and an RRH side CPRI interface 211c.

  FIG. 6 is a sequence chart showing a signal flow from the UE to the OLT in the PON system. In the BBU 211, (1) the scheduling information generating / transmitting unit 211b transmits the wireless scheduling information in the direction of the UE 29 and also transmits to the ONU 171 side. However, the radio scheduling information to the ONU 171 side includes not the transmission timing of the UE 29 but timing information (timing for receiving a signal from the UE 29 at the BBU 211 + α) converted to a timing at which it is actually received by the ONU 171 and a transmission data amount. (2) In the ONU 171, the scheduling information reading unit 171b reads only the packets including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information. (3) Further, in the ONU 171, when the data amount notification unit 171c notifies the OLT 131 of the accumulated data amount, the data amount notification unit 171c also notifies the data amount considering the radio scheduling information and its scheduling information.

  In the OLT 131, (4) when the upstream bandwidth allocation unit 131 b calculates the bandwidth of the ONU 171, as shown in FIG. 6, after first considering the transmission timing and data amount requested from the wireless scheduling information, the same ONU 171 is used. Is allocated to other ONUs connected to the OLT 131. However, when scheduling information arrives from a plurality of ONUs 171 to the OLT 131 and the reception timing of data based on the scheduling information becomes the same, the timing is shifted on the time axis except for one. Thereby, a collision is avoided. In the OLT 131, (5) the bandwidth allocation information notification unit 131c notifies each ONU 171 of the transmission timing and transmission permission data amount determined in (4). In the ONU 171, (6) the signal transmission unit 171d transmits the uplink signal from the predetermined BBU 211 in the reserved band.

  If it is not necessary to reduce the delay at the above level, there is a method in which the radio scheduling information sent to the UE 29 side in (1) is transmitted to the ONU 171 as it is, and a certain time delay is taken into account when reading the scheduling information. . There may be a case where the ONU 171 and the BBU 211 are integrated to further improve accuracy.

  In the second embodiment, the wireless scheduling information is grasped by the ONU 171. Further, (PON polling cycle)> (radio scheduling information arrival interval). In addition, when there is a bandwidth request from a plurality of base station devices at the same time, processing is performed on the time axis. The function of the device is the same as that shown in Figures 5a-c, but some operations are different. FIG. 7 is a sequence chart showing a signal flow from the UE to the OLT in the PON system.

  In the BBU 211, (1) the scheduling information generating / transmitting unit 211b transmits the wireless scheduling information in the direction of the UE 29 and also transmits to the ONU 171 side. However, the scheduling information to the ONU 171 side includes not the transmission timing of the UE 29 but timing information (timing for receiving a signal from the UE 29 at the BBU 211 + α) converted to a timing actually received by the ONU 171 and a transmission data amount. In the ONU 171, (2) the scheduling information reading unit 171b reads only the packets including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information.

  In the ONU 171, (3) when the data amount notification unit 171 c notifies the OLT 131 of the accumulated data amount, the ONU 171 also notifies the data amount considering the scheduling information and its scheduling information. Here, in order to prevent data from being received from the UE 29 before bandwidth allocation to the ONU 171, as shown in FIG. 7, when performing short-period fixed bandwidth allocation for notification of data amount and scheduling information to the target ONU 171, There may be a case where short-period fixed bandwidth allocation is performed for all the ONUs 171 that are targeted. In the latter case, when there is no transmission permission from the OLT 131 after waiting for a certain period, it is determined that the information has not reached the OLT 131 due to a collision, and is transmitted again in the fixed band.

  In the OLT 131, (4) when the upstream bandwidth allocation unit 131b calculates the bandwidth of the ONU 171, after first considering the transmission timing and data amount requested from the scheduling information, the bandwidth allocation to the same ONU 171 is performed. Bandwidth allocation to other ONUs connected to the OLT 131 is performed. However, when scheduling information arrives from a plurality of ONUs 171 to the OLT 131 and the reception timing of data based on the scheduling information becomes the same, the timing is shifted on the time axis except for one. Thereby, a collision is avoided. In the OLT 131, (5) the bandwidth allocation information notification unit 131c notifies each ONU 171 of the transmission timing and transmission permission data amount determined in (4). In the ONU 171, (6) the signal transmission unit 171d transmits an uplink signal from a predetermined base station apparatus in a reserved band.

  If it is not necessary to reduce the delay at the above level, there is a method in which the radio scheduling information sent to the UE 29 side in (1) is transmitted to the ONU 171 as it is and a delay of a certain time is taken into account when reading the radio scheduling information. is there. There may be a case where the ONU 171 and the base station apparatus are integrated to further improve accuracy.

  In the third embodiment, the wireless scheduling information is grasped by the ONU. Further, (PON polling cycle) ≦ (radio scheduling information arrival interval). In addition, when there is a bandwidth request from a plurality of base station devices at the same time, processing is performed on the wavelength axis.

  FIG. 8A is a diagram illustrating a schematic configuration of the OLT of the PON system according to the third embodiment, FIG. 8B is a diagram illustrating a schematic configuration of the ONU of the PON system according to the third embodiment, and FIG. It is a figure which shows BBU (base station apparatus) schematic structure of a PON system. As shown in FIG. 8a, the OLT 133 includes an upper network side interface 133a, an upstream bandwidth allocation unit 133b that prioritizes scheduling information, and a wavelength / DBA batch management unit that collectively manages the wavelength and DBA of each ONU. 133c, a bandwidth allocation information notification unit 133d for notifying bandwidth allocation information to each ONU, and an ONU side interface 133e having a WDM function.

  Further, as shown in FIG. 8b, the ONU 173 includes an OLT side interface 173a having a WDM function, a scheduling information reading unit 173b, a data amount notifying unit 173c for notifying a data amount to the OLT in consideration of the scheduling information, and a predetermined BBU. The signal transmission part 173d which transmits the signal of, and the low-order network side interface 173e are provided. Further, as shown in FIG. 8c, the BBU 213 includes an upper network side interface 213a, a scheduling information generation / transmission unit 213b that generates and transmits scheduling information, and an RRH side CPRI interface 213c.

  In the BBU 213, (1) the scheduling information generation / transmission unit 213b transmits the radio scheduling information in the UE direction and also transmits it to the ONU 173 side. However, in the wireless scheduling information to the ONU 173 side, not the transmission timing of the UE, but the timing information converted into the timing actually received by the ONU 173 (timing at which the signal from the UE is received by the base station apparatus + α), the transmission data amount Including. In the ONU 173, (2) the scheduling information reading unit 173b reads only the packets including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information.

  Further, in the ONU 173, (3) when the data amount notification unit 173c notifies the OLT 133 of the accumulated data amount, the ONU 173 also notifies the data amount considering the radio scheduling information and its scheduling information. In the OLT 133, (4) when the upstream bandwidth allocation unit 133b calculates the bandwidth of the ONU 173, first considers the transmission timing and data amount requested from the wireless scheduling information, and then allocates the remaining bandwidth to the same ONU 173. At the same time, bandwidth allocation to other ONUs connected to the OLT 133 is performed. However, when the wireless scheduling information arrives from a plurality of ONUs 173 to the OLT 133 and the reception timing of the data based on the same becomes the same, the wavelength / DBA collective management unit 133c uses the trigger as a trigger. Except for this, the wavelength of the ONU is changed to another wavelength. Thereby, a collision is avoided. The ONU 173 has a wavelength tunable light source, and the OLT 133 collectively manages the DBAs of the respective wavelengths during (4) DBA. In the OLT 133, when the upstream bandwidth allocation unit 133b operates, the wavelength / DBA collective management unit 133c can also operate simultaneously.

  In the OLT 133, (5) the bandwidth allocation information notification unit 133d notifies each ONU of the transmission timing and transmission permission data amount determined in (4). In addition, the wavelength change is notified to some ONUs 173. In the ONU 173, (6) the signal transmission unit 173d transmits the uplink signal from the predetermined BBU 213 in the reserved band and wavelength.

  If there is no need to reduce the delay at the above level, there is a method in which the wireless scheduling information sent to the UE side in (1) is transmitted to the ONU 173 as it is and a delay of a certain time is taken into account when reading the wireless scheduling information. . There is also a method of allocating an uplink band by combining a plurality of methods. There may be a case in which the ONU 173 and the base station apparatus are integrated to further improve accuracy.

  In the fourth embodiment, the wireless scheduling information is grasped by the ONU. Further, (PON polling cycle> radio scheduling information arrival interval). In addition, when there is a bandwidth request from a plurality of base station devices at the same time, processing is performed on the wavelength axis. The function of the device is the same as that shown in Figures 8a-c, but some operations are different.

  In the BBU 213, (1) the scheduling information generation / transmission unit 213b transmits the radio scheduling information in the UE direction and also transmits it to the ONU 173 side. However, in the wireless scheduling information to the ONU 173 side, not the transmission timing of the UE, but the timing information converted into the timing actually received by the ONU 173 (timing at which the signal from the UE is received by the base station apparatus + α), the transmission data amount Including. In the ONU 173, (2) the scheduling information reading unit 173b reads the scheduling information by dividing only the packet including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.).

  In the ONU 173, (3) when the data amount notification unit 173c notifies the OLT 133 of the accumulated data amount, the ONU 173 also notifies the data amount considering the wireless scheduling information and the wireless scheduling information. In order to prevent data from reaching the UE before allocating the bandwidth to the ONU 173, a short period of fixed bandwidth allocation for notifying the data amount and radio scheduling information to the target ONU 173, or a short period of all the target ONUs 173 In some cases, fixed bandwidth allocation is performed. In the latter case, if there is no transmission permission from the OLT 133 after waiting for a certain period, it is determined that the information has not reached the OLT 133 due to a collision, and is transmitted again in the fixed band.

  In the OLT 133, (4) when the upstream bandwidth allocation unit 133b calculates the bandwidth of the ONU 173, after first considering the transmission timing and data amount requested from the scheduling information, the bandwidth allocation to the same ONU 173 is performed. Bandwidth allocation to other ONUs connected to the OLT 133 is performed. However, if scheduling information arrives from a plurality of ONUs 173 to the OLT 133 and the reception timing of data based on the scheduling information becomes the same, the wavelength / DBA collective management unit 133c uses that as a trigger to remove one. The wavelength of the ONU 173 is changed to another wavelength. Thereby, a collision is avoided. The ONU 173 has a wavelength tunable light source, and the OLT 133 has a function of collectively managing DBAs of respective wavelengths during (4) DBA. In the OLT 133, when the upstream bandwidth allocation unit 133b operates, the wavelength / DBA collective management unit 133c can also operate simultaneously.

  In the OLT 133, (5) the bandwidth allocation information notification unit 133d notifies each ONU 173 of the transmission timing and transmission permission data amount determined in (4). In addition, the wavelength change is notified to some ONUs 173. In the ONU 173, (6) the signal transmission unit 173d transmits an uplink signal from a predetermined base station apparatus in a reserved band and wavelength.

  If it is not necessary to reduce the delay at the above level, there is a method in which the radio scheduling information sent to the UE side in (1) is sent to the ONU as it is and a delay of a certain time is taken into account when reading the radio scheduling information . There is also a method of allocating an uplink band by combining a plurality of methods. There may be a case where the ONU and the base station apparatus are integrated to further improve accuracy.

  In the fifth embodiment, the wireless scheduling information is grasped by OLT. Further, (PON polling cycle) ≦ (radio scheduling information arrival interval). Also, when there is a bandwidth request from a plurality of base station devices at the same time, processing is performed on the time axis.

  9A is a diagram illustrating a schematic configuration of the OLT of the PON system according to the fifth embodiment, FIG. 9B is a diagram illustrating a schematic configuration of the ONU of the PON system according to the fifth embodiment, and FIG. 9C is a diagram illustrating the configuration according to the fifth embodiment. It is a figure which shows BBU (base station apparatus) schematic structure of a PON system. As shown in FIG. 9a, the OLT 135 includes an upper network side interface 133a, a scheduling information reading unit 135b that reads scheduling information, an uplink band allocation unit 135c that prioritizes scheduling information and allocates an uplink band, and band allocation to each ONU. A bandwidth allocation information notification unit 135d for notifying information and an ONU side interface 135e are provided.

  Also, as shown in FIG. 9b, the ONU 175 includes an OLT side interface 175a, a data amount notification unit 175b that notifies the data amount to the OLT, a signal transmission unit 175c that transmits a signal from a predetermined BBU, and a lower network side interface 175d. Further, as shown in FIG. 9c, the BBU 215 includes an upper network side interface 215a, a scheduling information generation / transmission unit 215b that generates and transmits scheduling information, and an RRH side CPRI interface 215c.

  FIG. 10 is a sequence chart showing a signal flow from the UE to the OLT in the PON system. In the BBU 215, (1) the scheduling information generation / transmission unit 215b transmits the wireless scheduling information in the direction of the UE 29 and also transmits it to the ONU 175 side. However, the scheduling information to the ONU 175 side includes not the transmission timing of the UE 29 but timing information (timing for receiving a signal from the UE 29 at the BBU 215 + α) converted to a timing actually received by the ONU 175 and a transmission data amount. In the ONU 175, as shown in FIG. 10, in the ONU 175, (2) the data amount notification unit 175b notifies the OLT 135 as the data amount at the transmission timing in the same manner as normal data.

  In the OLT 135, (3) the scheduling information reading unit 135b reads only the packets including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information. In the OLT 135, (4) when the upstream bandwidth allocation unit 135c calculates the bandwidth of the ONU 175, after first considering the transmission timing and data amount requested from the wireless scheduling information, the bandwidth allocation to the same ONU 175 is performed. And bandwidth allocation to other ONUs connected to the OLT 135. However, when scheduling information arrives from a plurality of ONUs 175 to the OLT 135 and the reception timing of the data based on the scheduling information becomes the same, the timing is shifted on the time axis except for one. Thereby, a collision is avoided. In the OLT 135, (5) the band allocation information notification unit 135d notifies each ONU 175 of the transmission timing and the transmission permission data amount determined in (4). In the ONU 175, (6) the signal transmission unit 175c transmits an uplink signal from a predetermined base station apparatus in a reserved band.

  If there is no need to reduce the delay at the above level, there is a method in which the radio scheduling information sent to the UE 29 side in (1) is transmitted to the ONU 175 as it is and a delay of a certain time is taken into account when reading the radio scheduling information. . There may be a case in which the ONU 175 and the base station apparatus are integrated to further improve accuracy.

  In the sixth embodiment, the wireless scheduling information is grasped by OLT. Further, (PON polling cycle)> (radio scheduling information arrival interval). Also, when there is a bandwidth request from a plurality of base station devices at the same time, processing is performed on the time axis. The function of the device is the same as that shown in Figures 9a-c, but some operations are different. FIG. 11 is a sequence chart showing a signal flow from the UE to the OLT in the PON system. In the BBU 215, (1) the scheduling information generation / transmission unit 215b transmits the wireless scheduling information in the direction of the UE 29 and also transmits it to the ONU 175 side. However, the radio scheduling information to the ONU 175 side includes not the transmission timing of the UE 29 but timing information (timing at which the signal from the UE 29 is received by the BBU 215 + α) converted into timing actually received by the ONU 175 and a transmission data amount.

  In the ONU 175, (2) the data amount notification unit 175b notifies the OLT 135 as the data amount at the transmission timing in the same manner as normal data. Here, in order to prevent data from reaching the UE 29 before the ONU bandwidth allocation, as shown in FIG. 11, the target ONU is subject to the case where the short bandwidth fixed bandwidth allocation for notifying the data amount and scheduling information is performed. In some cases, all ONUs 175 may be assigned a fixed bandwidth with a short period. In the latter case, when there is no transmission permission from the OLT 135 after waiting for a certain period, it is determined that the information has not reached the OLT 135 due to a collision, and is transmitted again in the fixed band.

  In the OLT 135, (3) the scheduling information reading unit 135b reads only the packets including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information. In the OLT 135, (4) when the upstream bandwidth allocation unit 135c calculates the bandwidth of the ONU 175, after first considering the transmission timing and data amount requested from the wireless scheduling information, the bandwidth allocation to the same ONU 175 is performed. And bandwidth allocation to other ONUs connected to the OLT 135. However, when scheduling information arrives from a plurality of ONUs 175 to the OLT 135 and the reception timing of the data based on the scheduling information becomes the same, the timing is shifted on the time axis except for one. Thereby, a collision is avoided.

  In the OLT 135, (5) the bandwidth allocation information notification unit 135d notifies each ONU 175 of the transmission timing and transmission permission data amount determined in (4). In the ONU 175, (6) the signal transmission unit 175c transmits an uplink signal from a predetermined base station apparatus in a reserved band.

  When it is not necessary to reduce the delay at the above level, there is a method in which the scheduling information sent to the UE 29 side in (1) is transmitted to the ONU 175 as it is and a delay of a certain time is taken into account when reading the scheduling information. There may be a case in which the ONU 175 and the base station apparatus are integrated to further improve accuracy.

  In the seventh embodiment, the wireless scheduling information is grasped by OLT. Further, (PON polling cycle) ≦ (radio scheduling information arrival interval). In addition, when there are bandwidth requests from a plurality of base station apparatuses at the same time, processing is performed on the wavelength axis.

  12A is a diagram illustrating a schematic configuration of the OLT of the PON system according to the seventh embodiment, FIG. 12B is a diagram illustrating a schematic configuration of the ONU of the PON system according to the seventh embodiment, and FIG. 12C is a diagram illustrating the configuration according to the seventh embodiment. It is a figure which shows BBU (base station apparatus) schematic structure of a PON system. As shown in FIG. 12a, the OLT 137 includes an upper network side interface 137a, a scheduling information reading unit 137b that reads scheduling information, an uplink band allocation unit 137c that prioritizes scheduling information and allocates an uplink band, the wavelength and DBA of each ONU. A wavelength / DBA collective management unit 137d for collectively managing the bandwidth, a bandwidth allocation information notification unit 137e for notifying bandwidth allocation information to each ONU, and an ONU side interface 137f having a WDM function.

  As shown in FIG. 12b, the ONU 177 includes an OLT side interface 177a having a WDM function, a data amount notification unit 177b for notifying a data amount to the OLT, a signal transmission unit 177c for transmitting a signal from a predetermined BBU, and A lower network side interface 177d is provided. 12C, the BBU 217 includes an upper network side interface 217a, a scheduling information generation / transmission unit 217b that generates and transmits scheduling information, and an RRH side CPRI interface 217c.

  In the BBU 217, (1) the scheduling information generation / transmission unit 217b transmits the radio scheduling information in the UE direction and also to the ONU 177 side. However, the radio scheduling information to the ONU 177 side includes not the UE transmission timing but the timing information (timing for receiving a signal from the UE at the BBU 217 + α) converted to the timing actually received by the ONU 177 and the amount of transmission data.

  In the ONU 177, (2) the data amount notification unit 177b notifies the OLT 137 of the data amount at the transmission timing as the same processing as normal data. In the OLT 137, (3) the scheduling information reading unit 137b reads the wireless scheduling information by dividing only the packet including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.). In the OLT 137, (4) when the upstream bandwidth allocation unit 137c calculates the bandwidth of the ONU 177, first considers the transmission timing and data amount requested from the wireless scheduling information, and then allocates the remaining bandwidth to the same ONU 177. At the same time, bandwidth allocation to other ONUs connected to the OLT 137 is performed. However, when scheduling information arrives from a plurality of ONUs 177 to the OLT 137 and the reception timing of the data based on the scheduling information becomes the same, the wavelength / DBA collective management unit 137d uses that as a trigger to remove one. The wavelength of the ONU 177 is changed to another wavelength. Thereby, a collision is avoided. The ONU 177 has a wavelength tunable light source, and the OLT 137 has a function of collectively managing DBAs of respective wavelengths at the time of DBA. In the OLT 137, when the upstream bandwidth allocation unit 137c operates, the wavelength / DBA collective management unit 137d can also operate simultaneously.

  In the OLT 137, (5) the bandwidth allocation information notification unit 137e notifies each ONU 177 of the transmission timing and transmission permission data amount determined in (4). In addition, the wavelength change is notified to some ONUs 177. In the ONU 177, (6) the signal transmission unit 177c transmits the uplink signal from the predetermined BBU 217 in the reserved band and wavelength.

  If it is not necessary to reduce the delay at the above level, there is a method in which the radio scheduling information sent to the UE side in (1) is sent to the ONU as it is and a delay of a certain time is taken into account when reading the radio scheduling information . There is also a method of allocating an uplink band by combining a plurality of methods. There may be a case where the ONU and the base station apparatus are integrated to further improve accuracy.

  In the eighth embodiment, the wireless scheduling information is grasped by OLT. Further, (PON polling cycle)> (radio scheduling information arrival interval). In addition, when there are bandwidth requests from a plurality of base station apparatuses at the same time, processing is performed on the wavelength axis. The function of the device is the same as that shown in FIGS. 12a-c, but some operations are different.

  In the BBU 217, (1) the scheduling information generation / transmission unit 217b transmits the radio scheduling information in the UE direction and also to the ONU 177 side. However, the radio scheduling information to the ONU 177 side includes not the UE transmission timing but the timing information (timing for receiving a signal from the UE at the BBU 217 + α) converted to the timing actually received by the ONU 177 and the amount of transmission data.

  In the ONU 177, (2) the data amount notification unit 177b notifies the OLT 137 of the data amount at the transmission timing as the same processing as normal data. In order to prevent data from being received from the UE before allocating the ONU bandwidth, when a short-period fixed bandwidth allocation for notifying the data amount and the radio scheduling information is performed to the target ONU 177 or a short-period fixed bandwidth to all the target ONUs 177 In some cases, allocation is performed. In the latter case, when there is no transmission permission from the OLT 137 after waiting for a certain period, it is determined that the information has not reached the OLT 137 due to a collision, and is transmitted again in the fixed band.

  In the OLT 137, (3) the scheduling information reading unit 137b reads the wireless scheduling information by dividing only the packet including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.). In the OLT 137, (4) when the upstream bandwidth allocation unit 137c calculates the bandwidth of the ONU 177, first considers the transmission timing and data amount requested from the wireless scheduling information, and then allocates the remaining bandwidth to the same ONU 177. And bandwidth allocation to other ONUs connected to the OLT 137. However, when the wireless scheduling information arrives from the plurality of ONUs 177 to the OLT 137 and the reception timing of the data based on the information becomes the same, the wavelength / DBA batch management unit 137d uses the trigger as a trigger. Except for this, the wavelength of the ONU 177 is changed to another wavelength. Thereby, a collision is avoided. The ONU 177 has a wavelength tunable light source, and the OLT 137 has a function of collectively managing DBAs of respective wavelengths at the time of DBA. In the OLT 137, when the upstream bandwidth allocation unit 137c operates, the wavelength / DBA collective management unit 137d can also operate simultaneously.

  In the OLT 137, (5) the bandwidth allocation information notification unit 137e notifies each ONU 177 of the transmission timing and transmission permission data amount determined in (4). In addition, the wavelength change is notified to some ONUs 177. In the ONU 177, (6) the signal transmission unit 177c transmits the uplink signal from the predetermined BBU 217 in the reserved band and wavelength.

  If it is not necessary to reduce the delay at the above level, there is a method in which the radio scheduling information sent to the UE side in (1) is sent to the ONU as it is and a delay of a certain time is taken into account when reading the radio scheduling information . There is also a method of allocating an uplink band by combining a plurality of methods. In some cases, the ONU and the base station apparatus are integrated to further improve accuracy.

  FIG. 13 is a sequence chart showing a signal flow from the UE to the OLT in the PON system. In the ninth embodiment, the wireless scheduling information is grasped by the ONU and OLT. That is, the ONU cuts the transmission timing and data amount from the radio scheduling information, encapsulates and transmits the REPORT signal for the GATE signal received from the OLT. Here, the ONU may encapsulate the radio scheduling information itself, instead of cutting out the transmission timing and the data amount from the radio scheduling information. The OLT reads the transmission timing and the data amount from the encapsulated REPORT signal.

  In the ninth embodiment, (PON polling cycle) ≦ (radio scheduling information arrival interval) may be set, or (PON polling cycle)> (radio scheduling information arrival interval) may be set. In the latter case, a REPORT signal encapsulated in a fixed time slot may be transmitted.

  As described above, according to the present embodiment, when the radio scheduling information between the base station apparatus and the UE is transmitted from the base station apparatus to the UE, it is also transmitted to the ONU, so that the DBA processing time of the PON section TDMA-based PON can be applied to a wireless system that requires low delay.

11 Internet 13 OLT
15 Optical splitters 17, 17-1 to 17-n, 171 ONU
19 HGW
21-1 to 21-5 Base station apparatus 23, 211 BBU
25 RRH
27, 29-1 to 29-3 UE
131a Upper network side interface 131b Upstream bandwidth allocation unit 131c Band allocation information notification unit 131d ONU side interface 133a Upper network side interface 133b Upstream bandwidth allocation unit 133c Wavelength / DBA batch management unit 133d Band allocation information notification unit 133e ONU side interface 135b Scheduling information Reading unit 135c Upstream bandwidth allocation unit 135d Band allocation information notification unit 135e ONU side interface 137a Upper network side interface 137b Scheduling information reading unit 137c Upstream bandwidth allocation unit 137d Wavelength / DBA batch management unit 137e Bandwidth allocation information notification unit 137f ONU side interface 171a OLT side interface 171b Scheduling information reading unit 171c Data amount Notification unit 171d Signal transmission unit 171e Lower network side interface 173a OLT side interface 173b Scheduling information reading unit 173c Data amount notification unit 173d Signal transmission unit 173e Lower network side interface 175a OLT side interface 175b Data amount notification unit 175c Signal transmission unit 175d Lower layer network Side interface 177a OLT side interface 177b Data amount notification unit 177c Signal transmission unit 177d Lower network side interface 211a Upper network side interface 211b Scheduling information generation / transmission unit 211c RRH side CPRI interface 213a Upper network side interface 213b Scheduling information generation / transmission unit 213c RRH side CPR Interface 215a upper network side interface 215b scheduling information generating and transmitting section 215c RRH side CPRI interface 217a superordinate network side interface 217b scheduling information generating and transmitting section 217c RRH side CPRI interface

Claims (9)

A PON (Passive Optical Network) system that realizes optical fiber transmission of point-to-multipoint connection between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units),
The control station device under ONU is
Create scheduling information for instructing the transmission timing for each terminal device of the communication destination, and when a transmission request is received from any of the terminal devices, the transmission request is sent to the terminal device and ONU that transmitted the transmission request. A scheduling information generating / transmitting unit that transmits scheduling information corresponding to the terminal device that has transmitted,
ONU
A communication interface for communicating with each of the OLT and the control station device;
When receiving the scheduling information corresponding to the terminal device that transmitted the transmission request from the control station device, using a slot selected according to the magnitude relationship between the PON polling period and the scheduling information arrival interval or a predetermined slot, And a signal transmission unit that transmits the received scheduling information to the OLT.   When the PON polling period is equal to or less than the scheduling information arrival interval, the signal transmission unit transmits the transmission timing information and the data amount information included in the scheduling information to the OLT using a slot allocated by dynamic bandwidth allocation. 2. The PON system according to claim 1, wherein the transmission is performed.   When the PON polling period is larger than the scheduling information arrival interval, the signal transmission unit transmits the transmission timing information and the data amount information included in the scheduling information to the OLT using a slot allocated by fixed band allocation. The PON system according to claim 1.   The signal transmission unit encapsulates the scheduling information itself or transmission timing information and data amount information included in the scheduling information into a Report signal corresponding to the Gate signal received from the OLT and transmits the same to the OLT. The PON system according to claim 1.   The PON system according to claim 4, wherein the OLT reads transmission timing information and data amount information included in a Report signal received from the ONU. A PON (Passive Optical Network) system that realizes optical fiber transmission of point-to-multipoint connection between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units),
The control station device under ONU is
Create scheduling information for instructing the transmission timing for each terminal device of the communication destination, and when a transmission request is received from any of the terminal devices, the transmission request is sent to the terminal device and ONU that transmitted the transmission request. A scheduling information generating / transmitting unit that transmits scheduling information corresponding to the terminal device that has transmitted,
OLT
A communication interface for communicating with each ONU;
Bands that receive scheduling information from the ONUs and allocate a slot selected according to the magnitude relationship between the PON polling period and the scheduling information arrival interval of the terminal device transmitted from each ONU or a predetermined slot to the upstream band of each ONU A PON system comprising: an allocation unit.   The communication interface receives the scheduling information in a slot allocated by dynamic bandwidth allocation if the PON polling period is equal to or less than the scheduling information arrival interval, while fixed if the PON polling period is larger than the scheduling information arrival interval. 7. The PON system according to claim 6, wherein the scheduling information is received in a slot allocated by bandwidth allocation. A communication method of a PON (Passive Optical Network) system that realizes optical fiber transmission of point-to-multipoint connection between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units),
In the control station device under ONU,
Creating scheduling information for instructing the transmission timing for each communication destination terminal device;
When receiving a transmission request from any of the terminal devices, transmitting scheduling information corresponding to the terminal device that transmitted the transmission request to the terminal device and ONU that transmitted the transmission request;
In ONU,
Communicating with the OLT and the control station device,
When receiving the scheduling information corresponding to the terminal device that transmitted the transmission request from the control station device, using a slot selected according to the magnitude relationship between the PON polling period and the scheduling information arrival interval or a predetermined slot, Transmitting at least the received scheduling information to the OLT. A communication method of a PON (Passive Optical Network) system that realizes optical fiber transmission of point-to-multipoint connection between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units),
In the control station device under ONU,
Creating scheduling information for instructing the transmission timing for each communication destination terminal device;
When receiving a transmission request from any of the terminal devices, transmitting scheduling information corresponding to the terminal device that transmitted the transmission request to the terminal device and ONU that transmitted the transmission request;
In OLT,
Communicating with each ONU;
A step of receiving scheduling information from an ONU and allocating a slot selected according to a magnitude relationship between a PON polling period and a scheduling information arrival interval of a terminal device transmitted from each ONU or a predetermined slot to an upstream band of each ONU And at least a communication method.

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