JP6517116B2 - PON system and communication method - Google Patents

Description

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

  In recent years, as the speed of the radio access network provided by the mobile communication network is increased, the area (cell) covered by the base station apparatus becomes narrower, and as a result, the number of base station apparatuses to be installed to configure the mobile communication network. Is increasing. For this reason, as a network for accommodating a plurality of base station apparatuses, a passive optical network (PON: Passive Optical Network) system in which one optical transmission path is shared by a plurality of subscribers has been studied.

  In the PON system, one optical transmission line terminal (OLT: Optical Line Terminal) installed at a station of a telecommunications carrier is connected to a plurality of subscriber home terminals (ONUs: Optical Network Unit) via an optical splitter. It is done. The OLT realizes high bandwidth utilization efficiency by dynamically allocating an upstream band to a plurality of ONUs, for example, 64 ONUs, according to Time Division Multiple Access (TDMA).

  In future applications such as base station equipment and machine-to-machine (M2M), it is necessary to keep the transmission delay of the access network within 1 millisecond, but in the upstream transmission TDMA-based PON system, between OLT and ONU The control of Dynamic Bandwidth Allocation (DBA) causes a delay of up to several milliseconds, which makes it difficult to apply to the above applications.

  Here, as a method of efficiently transmitting uplink data in the PON section, a method of reliably allocating at least a fixed fixed bandwidth as a transmission permitted bandwidth to an ONU making a fixed bandwidth contract is disclosed in Patent Document 1 It is shown.

JP, 2011-146780, A

  However, in the technology described in Patent Document 1, since a fixed band is allocated to a specific ONU, even in a situation where communication is not actually performed, the band can not be used by other ONUs. Utilization efficiency will be worse. In addition, in other ONUs to which the fixed bandwidth is not allocated, large delay and packet loss may occur. Therefore, there is a need for a technique for transmitting a packet from a specific wireless base station with low delay without reducing the bandwidth utilization efficiency of PON.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a PON system and communication method capable of reducing the time required for dynamic band allocation of PON and reducing the delay of upstream transmission. To aim.

  (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). And the control station apparatus subordinate to the ONU creates scheduling information for instructing transmission timing for each terminal apparatus of the communication destination, and when the transmission request is received from any of the terminal apparatuses, the transmission is performed. A communication is provided with a scheduling information generation / transmission unit that transmits scheduling information corresponding to a terminal apparatus that has transmitted the transmission request to the terminal apparatus that transmitted the request and the ONU, and the ONU communicates with the OLT and the control station apparatus Interface and a schedule corresponding to a terminal device that has sent a transmission request from the control station device A signal transmission unit that transmits the received scheduling information to the OLT using a slot selected in advance or a predetermined slot according to the magnitude relationship between the PON polling period and the scheduling information arrival interval when ringing information is received; And the like.

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

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

  As described above, when the PON polling cycle is equal to or less than the scheduling information arrival interval, transmission timing information and data amount information included in the scheduling information are transmitted to the OLT using the slot allocated by dynamic band allocation. Therefore, it becomes possible to start dynamic band allocation on the PON side early, and it is possible to achieve low delay of uplink transmission.

  (3) Further, in the PON system according to the present invention, the signal transmission unit, when the PON polling cycle is larger than the scheduling information arrival interval, transmits fixed timing information and data amount information included in the scheduling information. It is characterized by transmitting to the OLT using the slot assigned by the.

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

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

  As described above, since the scheduling information itself or the transmission timing information and the data amount information included in the scheduling information are encapsulated in the Report signal corresponding to the Gate signal received from the OLT and transmitted to the OLT, dynamic band allocation is performed. While being executed, it becomes possible to transmit transmission timing information and data amount information to the OLT quickly.

  (5) Further, in the PON system according to the present invention, the OLT reads out 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 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 data amount information while executing dynamic band allocation. .

  (6) In addition, the PON system of the present invention is a PON (Point-to-Multi Point) -connected optical fiber transmission between an Optical Line Terminal (OLT) and a plurality of Optical Network Units (ONUs). In the case of a Passive Optical Network) system, the control station apparatus subordinate to the ONU creates scheduling information for instructing transmission timing for each terminal apparatus of the communication destination, and receives a transmission request from any of the terminal apparatuses A communication information generation / transmission unit for transmitting scheduling information corresponding to the terminal apparatus that has transmitted the transmission request to the terminal apparatus that has transmitted the transmission request and the ONU, and the OLT is a communication interface that communicates with each ONU Receive scheduling information from the ONU, and transmit 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 or a predetermined slot selected according to the magnitude relationship between the PON polling cycle and the scheduling information arrival interval of the terminal apparatus transmitted from each ONU. Since allocation is performed to the upstream band of the ONU, it is possible to quickly obtain transmission timing information and data amount information while executing dynamic band allocation.

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

  Thus, in the OLT, if the PON polling cycle is equal to or less than the scheduling information arrival interval, the scheduling information is received in the time slot allocated by dynamic band allocation, while the PON polling cycle is larger than the scheduling information arrival interval For example, since the scheduling information is received in a time slot allocated by fixed band allocation, it is possible to quickly obtain transmission timing information and data amount information while executing dynamic band allocation.

  (8) In addition, according to the communication method of the present invention, a PON (Point-to-Multi Point) optical fiber transmission is realized between an Optical Line Terminal (OLT) and a plurality of Optical Network Units (ONUs). In a communication method of a Passive Optical Network) system, a control station apparatus subordinate to an ONU generates scheduling information for instructing transmission timing for each terminal apparatus of communication destinations, and transmission from any of the terminal apparatuses When receiving a request, transmitting scheduling information corresponding to the terminal device that has sent the transmission request to the terminal device and ONU that sent the transmission request, and in the ONU, communicate with the OLT and the control station device respectively And a schedule corresponding to a terminal apparatus that has transmitted a transmission request from the control station apparatus. Transmitting the received scheduling information to the OLT using a slot selected in advance or a predetermined slot according to the magnitude relationship between the PON polling period and the scheduling information arrival interval when information is received It is characterized by

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

  (9) In addition, according to the communication method of the present invention, a PON (Point-to-Multi Point) optical fiber transmission is realized between an Optical Line Terminal (OLT) and a plurality of Optical Network Units (ONUs). In a communication method of a Passive Optical Network) system, a control station apparatus subordinate to an ONU generates scheduling information for instructing transmission timing for each terminal apparatus of communication destinations, and transmission from any of the terminal apparatuses Transmitting scheduling information corresponding to the terminal apparatus that has transmitted the transmission request to the terminal apparatus and ONU that transmitted the transmission request, and performing communication with each ONU in the OLT; Terminal receives scheduling information from ONUs and transmits PON polling cycles and 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 or a predetermined slot selected according to the magnitude relationship between the PON polling cycle and the scheduling information arrival interval of the terminal apparatus transmitted from each ONU. Since allocation is performed to the upstream band of the ONU, it is possible to quickly obtain 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 dynamic band allocation of PON and to reduce uplink transmission delay.

It is a figure showing an outline of a PON system concerning 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. FIG. 2 is a diagram showing a schematic configuration of an OLT of the PON system in the first embodiment. FIG. 2 is a diagram showing a schematic configuration of an ONU of a PON system in Embodiment 1. FIG. 2 is a diagram showing a schematic configuration of a BBU (base station apparatus) of the PON system in the first embodiment. 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. 16 is a diagram showing a schematic configuration of an OLT of a PON system in a third embodiment. FIG. 16 is a diagram showing a schematic configuration of an ONU of a PON system in a third embodiment. FIG. 16 is a diagram showing a schematic configuration of a BBU (base station apparatus) of the PON system in the third embodiment. FIG. 16 is a diagram showing a schematic configuration of an OLT of a PON system in a fifth embodiment. FIG. 16 is a diagram showing a schematic configuration of an ONU of a PON system in a fifth embodiment. FIG. 16 is a diagram showing a schematic configuration of a BBU (base station apparatus) of a PON system in a fifth embodiment. 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. 18 is a diagram showing a schematic configuration of an OLT of a PON system in a seventh embodiment. FIG. 18 is a diagram showing a schematic configuration of an ONU of a PON system in a seventh embodiment. FIG. 18 is a diagram showing a schematic configuration of a BBU (base station apparatus) of a PON system in 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 present inventors pay attention to the fact that the control of dynamic band allocation between the OLT and the ONU causes a delay of up to several milliseconds order, and the cooperation between the PON and the base station apparatus is It has been found that the dynamic band allocation procedure can be started early by transmitting the wireless scheduling information transmitted by the base station apparatus to the mobile station apparatus also to the ONU side, 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). And the control station apparatus subordinate to the ONU creates scheduling information for instructing transmission timing for each terminal apparatus of the communication destination, and when the transmission request is received from any of the terminal apparatuses, the transmission is performed. A communication is provided with a scheduling information generation / transmission unit that transmits scheduling information corresponding to a terminal apparatus that has transmitted the transmission request to the terminal apparatus that transmitted the request and the ONU, and the ONU communicates with the OLT and the control station apparatus Interface and a schedule corresponding to a terminal device that has sent a transmission request from the control station device A signal transmission unit that transmits the received scheduling information to the OLT using a slot selected in advance or a predetermined slot according to the magnitude relationship between the PON polling period and the scheduling information arrival interval when ringing information is received; And the like.

  As a result, the present inventors cooperated with the PON and the base station, and it is possible to start dynamic band allocation early on the PON side, and as a result, it is possible to reduce the delay of upstream transmission. And Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a diagram showing an outline of a PON system according to the present embodiment. In the 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. Further, base stations 21-1 to 21-5 configured of BBU (Base Band Unit) and RRH (Remote Radio Head) are connected to the ONUs 17-2 to 17-n, and subordinate UEs 29-1 to 21-5 are connected. It communicates wirelessly with 29-3. As shown in FIG. 1, the wireless communication between the base station apparatuses 21-1 to 21-5 and the UEs 29-1 to 29-3 is performed by a method such as 3G, 4G, 5G or the like. Here, the base station apparatus or the HGW constitutes a control station apparatus, and the UE (mobile station apparatus) constitutes a terminal apparatus. Although communication between the control station apparatus and the terminal apparatus is described by taking wireless communication as an example in the present specification, the present invention is not limited to this, and even if both communication is wired communication good.

  FIG. 2 is a sequence chart showing an example of communication between the ONU and the OLT. Here, one ONU is shown 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 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 device 21 to transmit DATA, the BBU 23 of the base station device 21 transmits "radio scheduling information" as scheduling information to the UE 29, and the 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, whereby dynamic band allocation in the PON is performed. When dynamic band allocation is performed, the ONU 17 transmits DATA stored in the buffer to the OLT 13. In FIG. 3, the time of wireless scheduling is (1), the time of dynamic band allocation between ONU and OLT is (2), the time of transmitting DATA from UE to ONU is (3), ONU to OLT Assuming that the time for transmitting DATA by (4), the delay time has a magnitude 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 device 21 to transmit DATA, the BBU 23 of the base station device 21 transmits radio scheduling information to the UE 29. At the same time, the radio scheduling information is also transmitted to the ONU 17. Here, the BBU 23 may transmit the wireless scheduling information to the UE 29 at the same time as transmitting the wireless scheduling information to the ONU 17, but may not necessarily simultaneously. When the ONU 17 receives the wireless scheduling information, it sends the OLT 13 the transmission timing information and data amount information contained in the wireless scheduling information together with the REPORT signal corresponding to the first GATE signal received from the OLT 13. As a result, dynamic band allocation is started early, and DATA that reaches ONU 17 can be transmitted to OLT 13 early. Thus, in FIG. 4, it is assumed that the time of wireless scheduling is (1), the time of dynamic band allocation between ONU and OLT is (3), and the time for transmitting DATA from ONU to OLT is (4). The delay time can be shortened to “(1) + (3) + (4)”.

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

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

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

  Function to read scheduling information by separating only wireless scheduling information by ONU or OLT (differentiated by VLAN, COS, TOS, etc.). Here, in the case of grasping the wireless scheduling information by the ONU, when notifying the OLT of the accumulated data amount to the OLT, the ONU notifies the data amount considering the amount of wireless scheduling information and the wireless scheduling information. On the other hand, when grasping | ascertaining radio | wireless scheduling information in OLT, it is considered as the same treatment as normal data, and is notified to OLT as data amount.

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

  If the PON polling cycle is larger than the wireless schedule arrival interval, the data amount to the target ONU, short for wireless scheduling information notification, to prevent data from the UE (BBU) from reaching before ONU bandwidth allocation. Perform fixed bandwidth allocation of the cycle. Alternatively, fixed bandwidth allocation in a short cycle is performed to all ONUs targeted for low delay. When performing fixed-cycle bandwidth allocation to all ONUs subject to low delay, if there is no transmission permission from the OLT after a certain period of time, it is determined that information has not reached the OLT due to a collision, and transmission is performed again with the specified fixed bandwidth. .

  Next, each example of the present invention will be described. 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. Also, (PON polling cycle) ≦ (wireless scheduling information arrival interval). Also, when there is a bandwidth request from a plurality of base station devices simultaneously, processing is performed on the time axis.

  FIG. 5a is a view showing a schematic configuration of an OLT of the PON system in the first embodiment, FIG. 5b is a view showing a schematic configuration of an ONU in the PON system in the first embodiment, and FIG. 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 has an upper network interface 131a, an upstream bandwidth allocation unit 131b which allocates upstream bandwidths with priority given to scheduling information, and a bandwidth allocation information notification unit 131c which reports bandwidth allocation information to each ONU. , And 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 a data amount to the OLT in consideration of the scheduling information, and a signal from a predetermined BBU. 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 for generating and transmitting scheduling information, and an RRH side CPRI interface 211c.

  FIG. 6 is a sequence chart showing the flow of signals from the UE to the OLT in the PON system. In the BBU 211, (1) the scheduling information generation / transmission unit 211b transmits the radio scheduling information toward the UE 29 and also to the ONU 171. However, the radio scheduling information to the ONU 171 side does not include the transmission timing of the UE 29 but includes timing information (timing that the signal from the UE 29 is received by the BBU 211 + α) and the transmission data amount converted into the timing actually received by the ONU 171. (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 notifying the OLT 131 of the accumulated data amount, the data amount notifying unit 171c notifies the data amount considering the wireless scheduling information and the scheduling information thereof.

  In the OLT 131, (4) when the upstream band allocation unit 131b calculates the bandwidth of the ONU 171, as shown in FIG. 6, the transmission timing and data amount requested from the wireless scheduling information are considered first, and then the same ONU 171 is calculated. The remaining bandwidth is allocated to the other ONUs connected to the OLT 131. However, when the scheduling information reaches the OLT 131 from the plurality of ONUs 171 and the reception timing of the data based on it reaches the same, the timing is shifted on the time axis except one. This avoids collisions. Further, in the OLT 131, (5) the band 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 upstream signal from the predetermined BBU 211 in the secured band.

  When it is not necessary to reduce the delay at the above level, there is also a method of transmitting the wireless scheduling information sent to the UE 29 side as it is to the ONU 171 in the above (1) and considering the delay for a fixed time when reading the scheduling information. . There is also conceivable a case in which the ONU 171 and the BBU 211 are integrated to further improve the accuracy.

  In the second embodiment, the wireless scheduling information is grasped by the ONU 171. Further, it is assumed that (PON polling cycle)> (wireless scheduling information arrival interval). Also, when there is a bandwidth request from a plurality of base station devices simultaneously, processing is performed on the time axis. The function of the device is the same as that shown in FIGS. 5a-c but with some differences in operation. FIG. 7 is a sequence chart showing the flow of signals from the UE to the OLT in the PON system.

  In the BBU 211, (1) the scheduling information generation / transmission unit 211b transmits the radio scheduling information toward the UE 29 and also to the ONU 171. However, the scheduling information for the ONU 171 includes not the transmission timing of the UE 29 but the timing information (timing that the signal from the UE 29 is received by the BBU 211 + α) and the transmission data amount converted to the timing actually received by the ONU 171. In the ONU 171, (2) the scheduling information reading unit 171b divides only the packet including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information.

  Further, in the ONU 171, (3) the data amount notification unit 171c notifies the OLT 131 of the amount of data in consideration of the amount of scheduling information and the scheduling information when notifying the amount of accumulated data to the OLT 131. Here, in order to prevent data from reaching from the UE 29 before the bandwidth allocation to the ONU 171, as shown in FIG. 7, the case of performing fixed bandwidth allocation of a short cycle for notifying data amount and scheduling information to the target ONU 171, In some cases, fixed bandwidth allocation with a short cycle may be performed on all the target ONUs 171. In the latter case, when there is no transmission permission from the OLT 131 after waiting for a certain period, it is determined that information has not reached the OLT 131 due to a collision, and transmission is again performed in the fixed band.

  In the OLT 131, (4) the upstream band allocation unit 131b performs the remaining band allocation to the same ONU 171 after first considering the transmission timing and data amount requested from the scheduling information when calculating the band of the ONU 171. Bandwidth allocation to other ONUs connected to the OLT 131 is performed. However, when the scheduling information reaches the OLT 131 from the plurality of ONUs 171 and the reception timing of the data based on it reaches the same, the timing is shifted on the time axis except one. This avoids collisions. Further, in the OLT 131, (5) the band 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 upstream signal from a predetermined base station apparatus in the secured band.

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

  In the third embodiment, the wireless scheduling information is grasped by the ONU. Also, (PON polling cycle) ≦ (wireless scheduling information arrival interval). In addition, when there are bandwidth requests simultaneously from a plurality of base station apparatuses, processing is performed on the wavelength axis.

  FIG. 8a is a diagram showing a schematic configuration of an OLT of the PON system in the third embodiment, FIG. 8b is a diagram showing a schematic configuration of an ONU in the PON system in 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 is an upstream network side interface 133a, an upstream bandwidth allocation unit 133b which allocates upstream bandwidth by giving priority to scheduling information, and a wavelength / DBA batch management unit which collectively manages the wavelength of each ONU and DBA. 133 c, a band allocation information notification unit 133 d for notifying band allocation information to each ONU, and an ONU-side interface 133 e having a WDM function.

  Also, as shown in FIG. 8b, the ONU 173 has an OLT side interface 173a having a WDM function, a scheduling information reading unit 173b, a data amount notification unit 173c for notifying the data amount to the OLT considering the scheduling information, and a predetermined BBU , And a lower network side interface 173e. Further, as shown in FIG. 8c, the BBU 213 includes an upper network side interface 213a, a scheduling information generation / transmission unit 213b for generating and transmitting 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 toward the UE and also to the ONU 173. However, instead of the transmission timing of the UE, the timing information (the timing when the signal from the UE is received by the base station apparatus + α) and the amount of transmission data are included in the wireless scheduling information for the ONU 173 instead of the transmission timing of the UE. Including. In the ONU 173, (2) the scheduling information reading unit 173b separates only packets including wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information.

  Further, in the ONU 173, (3) the data amount notification unit 173c notifies the OLT 133 of the data amount in consideration of the wireless scheduling information and the scheduling information thereof when notifying the OLT 133 of the accumulated data amount. In the OLT 133, (4) the upstream band allocation unit 133b performs remaining band allocation to the same ONU 173 after first considering the transmission timing and data amount requested from the wireless scheduling information when calculating the band of the ONU 173. Also, bandwidth allocation to other ONUs connected to the OLT 133 is performed. However, when wireless scheduling information reaches OLT 133 from a plurality of ONUs 173 and the reception timing of data based on it becomes the same, wavelength / DBA batch management unit 133 c is triggered by that as one trigger. Except for changing the wavelength of ONU to another wavelength. This avoids collisions. The ONU 173 has a variable-wavelength light source, and the OLT 133 collectively manages DBAs of respective wavelengths at (4) DBA. In the OLT 133, when the upstream band allocation unit 133b operates, the wavelength / DBA batch management unit 133c can also operate at the same time.

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

  When it is not necessary to reduce the delay at the above level, there is also a method of transmitting the wireless scheduling information sent to the UE side as it is to the ONU 173 in (1) and considering the delay for a fixed time when reading the wireless scheduling information. . In addition, there is also a method of allocating an uplink band by a combination of a plurality of methods. There is also conceivable a case in which the ONU 173 and the base station apparatus are integrated to further improve the accuracy.

  In the fourth embodiment, the wireless scheduling information is grasped by the ONU. Further, (PON polling period> radio scheduling information arrival interval). In addition, when there are bandwidth requests simultaneously from a plurality of base station apparatuses, processing is performed on the wavelength axis. The function of the device is the same as shown in FIGS. 8a-c, but with some differences in operation.

  In the BBU 213, (1) the scheduling information generation / transmission unit 213b transmits the radio scheduling information toward the UE and also to the ONU 173. However, instead of the transmission timing of the UE, the timing information (the timing when the signal from the UE is received by the base station apparatus + α) and the amount of transmission data are included in the wireless scheduling information for the ONU 173 instead of the transmission timing of the UE. Including. In the ONU 173, (2) the scheduling information reading unit 173b separates only the packets including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the scheduling information.

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

  In the OLT 133, (4) the upstream band allocation unit 133b performs the remaining band allocation to the same ONU 173 after first considering the transmission timing and data amount requested from the scheduling information when calculating the band of the ONU 173. Bandwidth allocation to other ONUs connected to the OLT 133 is performed. However, when scheduling information arrives from a plurality of ONUs 173 to the OLT 133 and the reception timing of data based on it reaches the same time, the wavelength / DBA batch management unit 133 c takes one of them as a trigger and excludes one. Thus, the wavelength of the ONU 173 is changed to another wavelength. This avoids collisions. The ONU 173 has a variable wavelength light source, and the OLT 133 has a function of collectively managing DBAs of respective wavelengths at (4) DBA. In the OLT 133, when the upstream band allocation unit 133b operates, the wavelength / DBA batch management unit 133c can also operate at the same time.

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

  If it is not necessary to reduce the delay at the above level, there is also a method of transmitting the wireless scheduling information sent to the UE side as it is to the ONU in (1) and considering the delay for a fixed time when reading the wireless scheduling information. . There is also a method of allocating the upstream band by combining a plurality of methods. There is also conceivable a case in which the ONU and the base station apparatus are integrated to further improve the accuracy.

  In the fifth embodiment, the wireless scheduling information is grasped by the OLT. Also, (PON polling cycle) ≦ (wireless scheduling information arrival interval). In addition, when there are bandwidth requests from multiple base station devices simultaneously, processing is performed on the time axis.

  FIG. 9a is a diagram showing a schematic configuration of an OLT of the PON system in the fifth embodiment, FIG. 9b is a diagram showing a schematic configuration of an ONU in the PON system in the fifth embodiment, and FIG. It is a figure which shows BBU (base station apparatus) schematic structure of a PON system. As shown in FIG. 9A, the OLT 135 has an upper network interface 133a, a scheduling information reading unit 135b for reading scheduling information, an uplink bandwidth allocation unit 135c for allocating uplink bandwidth with priority given to scheduling information, and bandwidth allocation to each ONU. A bandwidth allocation information notification unit 135d for notifying information and an ONU side interface 135e are provided.

  Further, as shown in FIG. 9b, the ONU 175 has an OLT side interface 175a, a data amount notifying unit 175b notifying an amount of data to the OLT, a signal transmission unit 175c transmitting a signal from a predetermined BBU, and a lower network side interface It is equipped with 175d. Further, as shown in FIG. 9c, the BBU 215 includes an upper network side interface 215a, a scheduling information generation / transmission unit 215b for generating and transmitting scheduling information, and an RRH side CPRI interface 215c.

  FIG. 10 is a sequence chart showing the flow of signals from the UE to the OLT in the PON system. In the BBU 215, (1) the scheduling information generation / transmission unit 215b transmits the radio scheduling information in the direction of the UE 29 and also to the ONU 175 side. However, the scheduling information to the ONU 175 side does not include the transmission timing of the UE 29 but includes timing information (timing that the signal from the UE 29 is received by the BBU 215 + α) and the transmission data amount converted to the timing actually received by the ONU 175. 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 as the normal data in the transmission timing.

  In the OLT 135, (3) the scheduling information reading unit 135b divides only the packet including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information. Further, in the OLT 135, (4) when the upstream band allocation unit 135c calculates the band of the ONU 175, the transmission timing and data amount requested from the wireless scheduling information are first considered, and then the remaining band allocation to the same ONU 175 is performed. And assign bandwidths to other ONUs connected to the OLT 135. However, when scheduling information arrives from the plurality of ONUs 175 to the OLT 135 and the reception timing of the data based on it reaches the same, the timing is shifted on the time axis except one. This avoids collisions. In the OLT 135, (5) the band 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 upstream signal from a predetermined base station apparatus in the secured band.

  If it is not necessary to reduce the delay at the above level, there is also a method of transmitting the wireless scheduling information sent to the UE 29 side as it is to the ONU 175 in (1) and considering the delay for a fixed time when reading the wireless scheduling information. . There is also conceivable a case in which the ONU 175 and the base station apparatus are integrated to further improve the accuracy.

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

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

  In the OLT 135, (3) the scheduling information reading unit 135b divides only the packet including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information. Further, in the OLT 135, (4) when the upstream band allocation unit 135c calculates the band of the ONU 175, the transmission timing and data amount requested from the wireless scheduling information are first considered, and then the remaining band allocation to the same ONU 175 is performed. And assign bandwidths to other ONUs connected to the OLT 135. However, when scheduling information arrives from the plurality of ONUs 175 to the OLT 135 and the reception timing of the data based on it reaches the same, the timing is shifted on the time axis except one. This avoids collisions.

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

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

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

  FIG. 12 a is a diagram showing a schematic configuration of an OLT of the PON system in the seventh embodiment, FIG. 12 b is a diagram showing a schematic configuration of an ONU in the PON system in the seventh embodiment, and FIG. 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 interface 137a, a scheduling information reading unit 137b that reads scheduling information, an upstream bandwidth allocation unit 137c that assigns upstream bandwidth by prioritizing scheduling information, wavelength of each ONU, and DBA. And a bandwidth allocation information notification unit 137 e for notifying bandwidth allocation information to each ONU, and an ONU side interface 137 f having a WDM function.

  Further, as shown in FIG. 12b, the ONU 177 has an OLT side interface 177a having a WDM function, a data amount notification unit 177b for notifying the data amount to the OLT, a signal transmission unit 177c for transmitting a signal from a predetermined BBU, A lower network side interface 177 d is provided. Further, as shown in FIG. 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 toward the UE and also to the ONU 177. However, the radio scheduling information to the ONU 177 side does not include the transmission timing of the UE, but includes timing information (timing that the signal from the UE is received by the BBU 217 + α) and the transmission data amount, which are converted to the timing actually received by the ONU 177.

  In the ONU 177, (2) the data amount notification unit 177b notifies the OLT 137 as the data amount at the transmission timing as it is treated as normal data. In the OLT 137, (3) the scheduling information reading unit 137b divides only the packets including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information. In the OLT 137, (4) the upstream band allocation unit 137c performs remaining band allocation to the same ONU 177 after first considering the transmission timing and data amount requested from the wireless scheduling information when calculating the band of the ONU 177. Also, 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 it becomes the same, the wavelength / DBA batch management unit 137 d takes one of them as a trigger and excludes one. Thus, the wavelength of the ONU 177 is changed to another wavelength. This avoids collisions. The ONU 177 has a wavelength variable 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 band allocation unit 137c operates, the wavelength / DBA batch management unit 137d can also operate at the same time.

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

  If it is not necessary to reduce the delay at the above level, there is also a method of transmitting the wireless scheduling information sent to the UE side as it is to the ONU in (1) and considering the delay for a fixed time when reading the wireless scheduling information. . In addition, there is also a method of allocating an uplink band by a combination of a plurality of methods. There is also conceivable a case in which the ONU and the base station apparatus are integrated to further improve the accuracy.

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

  In the BBU 217, (1) the scheduling information generation / transmission unit 217b transmits the radio scheduling information toward the UE and also to the ONU 177. However, the radio scheduling information to the ONU 177 side does not include the transmission timing of the UE, but includes timing information (timing that the signal from the UE is received by the BBU 217 + α) and the transmission data amount, which are converted to the timing actually received by the ONU 177.

  In the ONU 177, (2) the data amount notification unit 177b notifies the OLT 137 as the data amount at the transmission timing as it is treated as normal data. In order to prevent data from reaching from the UE before ONU bandwidth allocation, when performing fixed bandwidth allocation of a short cycle for notifying the data amount, wireless scheduling information notification to the target ONU 177, or fixed bandwidth of short cycle for all ONU 177 targeted There are also cases where allocations are made. In the latter case, when there is no transmission permission from the OLT 137 after waiting for a certain period, it is determined that information has not reached the OLT 137 due to a collision, and transmission is again performed in the fixed band.

  In the OLT 137, (3) the scheduling information reading unit 137b divides only the packets including the wireless scheduling information (differentiated by VLAN, COS, TOS, etc.) and reads the wireless scheduling information. Furthermore, in the OLT 137, (4) when the upstream band allocation unit 137c calculates the band of the ONU 177, the transmission timing and data amount requested from the wireless scheduling information are first considered, and then the remaining band allocation to the same ONU 177 is performed. And assign bandwidths to other ONUs connected to the OLT 137. However, when the wireless scheduling information reaches the OLT 137 from the plurality of ONUs 177, and the reception timing of the data based on it becomes the same, the wavelength / DBA batch management unit 137d takes one of them as a trigger. Except for this, the wavelength of the ONU 177 is changed to another wavelength. This avoids collisions. The ONU 177 has a wavelength variable 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 band allocation unit 137c operates, the wavelength / DBA batch management unit 137d can also operate at the same time.

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

  If it is not necessary to reduce the delay at the above level, there is also a method of transmitting the wireless scheduling information sent to the UE side as it is to the ONU in (1) and considering the delay for a fixed time when reading the wireless scheduling information. . In addition, there is also a method of allocating an uplink band by a combination of a plurality of methods. In some cases, the ONU and the base station apparatus may be integrated to further improve the accuracy.

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

  In the ninth embodiment, (PON polling cycle) ≦ (wireless scheduling information arrival interval) may be satisfied, or (PON polling cycle)> (wireless scheduling information arrival interval). 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 wireless scheduling information between the base station apparatus and the UE is transmitted from the base station apparatus to the UE, the DBA processing time in the PON section is also transmitted to the ONU. Thus, the TDMA-based PON can be applied to wireless systems requiring low delay.

11 Internet 13 OLT
15 optical splitter 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 band allocation unit 131c band allocation information notification unit 131d ONU side interface 133a upstream network side interface 133b upstream band 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 Bandwidth allocation information notification unit 135e ONU side interface 137a Upper network side interface 137b Scheduling information readout 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 171 b Scheduling information reading unit 171 c Amount of data Notification unit 171 d Signal transmission unit 171 e Lower network side interface 173 a OLT side interface 173 b Scheduling information reading unit 173 c Data amount notification unit 173 d Signal transmission unit 173 e Lower network side interface 175 a OLT side interface 175 b Data amount notification unit 175 c Signal transmission unit 175 d Lower network Side interface 177a OLT side interface 177b data amount notifying 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 which realizes optical fiber transmission of point-to-multipoint (Point to Multi Point) connection between an Optical Line Terminal (OLT) and a plurality of Optical Network Units (ONUs),
The control station apparatus under the ONU is
When scheduling information for instructing transmission timing is created for each terminal apparatus of the communication destination, and a transmission request is received from any of the terminal apparatuses, the transmission request is transmitted to the terminal apparatus that has transmitted the transmission request and the ONU. A scheduling information generation / transmission unit for transmitting scheduling information corresponding to the transmitted terminal apparatus;
ONU is
A communication interface for communicating with the OLT and the control station apparatus,
When receiving scheduling information corresponding to a terminal apparatus that has transmitted a transmission request from a control station apparatus, a slot or fixed band allocated by dynamic band allocation according to the magnitude relationship between the PON polling period and the scheduling information arrival interval A signal transmission unit that transmits the received scheduling information to the OLT using a slot assigned by assignment . The signal transmission unit, PON polling period is less than or equal to the scheduling information reaches intervals, the transmission timing information and data amount information included in the scheduling information, using the slot assigned by the dynamic bandwidth assignment OLT The PON system according to claim 1, wherein said PON system transmits the PON system. The signal transmission unit, PON polling period is greater than the scheduling information reaches intervals, transmits the transmission timing information and data amount information included in the scheduling information, the OLT using a slot allocated by the fixed bandwidth The PON system according to claim 1, characterized in that:   The signal transmission unit encapsulates the scheduling information itself or transmission timing information and data amount information included in the scheduling information in a Report signal corresponding to a Gate signal received from the OLT, and transmits the Report signal to the OLT. The PON system according to claim 1, characterized in that   5. The PON system according to claim 4, wherein the OLT reads out transmission timing information and data amount information contained in a Report signal received from the ONU. A PON (Passive Optical Network) system which realizes optical fiber transmission of point-to-multipoint (Point to Multi Point) connection between an Optical Line Terminal (OLT) and a plurality of Optical Network Units (ONUs),
The control station apparatus under the ONU is
When scheduling information for instructing transmission timing is created for each terminal apparatus of the communication destination, and a transmission request is received from any of the terminal apparatuses, the transmission request is transmitted to the terminal apparatus that has transmitted the transmission request and the ONU. A scheduling information generation / transmission unit for transmitting scheduling information corresponding to the transmitted terminal apparatus;
OLT is
A communication interface that communicates with each ONU;
Scheduling information is received from an ONU, and allocated according to a slot allocated by dynamic band allocation or fixed band allocation according to the magnitude relationship between a PON polling period and a scheduling information arrival interval of a terminal apparatus transmitted from each ONU And a band allocation unit which allocates slots to the upstream band of each ONU. The communications interface, PON polling period is equal to or less scheduling information arrival period, while receiving the scheduling information in the slot assigned by the dynamic bandwidth allocation, PON polling period is greater than the scheduling information arrival period, PON system according to claim 6, wherein the receiving the scheduling information in the slot assigned by the fixed bandwidth allocation. A communication method of a PON (Passive Optical Network) system which realizes optical fiber transmission of point-to-multipoint (Point to Multi Point) connection between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units).
In the control station apparatus under the ONU,
Creating scheduling information for instructing transmission timing for each terminal apparatus of the communication destination;
Transmitting scheduling information corresponding to the terminal apparatus that has transmitted the transmission request to the terminal apparatus and ONU that have transmitted the transmission request, when a transmission request is received from any of the terminal apparatuses;
At the ONU
Communicating with the OLT and the control station respectively;
When receiving scheduling information corresponding to a terminal apparatus that has transmitted a transmission request from a control station apparatus, a slot or fixed band allocated by dynamic band allocation according to the magnitude relationship between the PON polling period and the scheduling information arrival interval Transmitting the received scheduling information to the OLT using a slot assigned by assignment . A communication method of a PON (Passive Optical Network) system which realizes optical fiber transmission of point-to-multipoint (Point to Multi Point) connection between an OLT (Optical Line Terminal) and a plurality of ONUs (Optical Network Units).
In the control station apparatus under the ONU,
Creating scheduling information for instructing transmission timing for each terminal apparatus of the communication destination;
Transmitting scheduling information corresponding to the terminal apparatus that has transmitted the transmission request to the terminal apparatus and ONU that have transmitted the transmission request, when a transmission request is received from any of the terminal apparatuses;
At the OLT
Communicating with each ONU;
Scheduling information is received from an ONU, and allocated according to a slot allocated by dynamic band allocation or fixed band allocation according to the magnitude relationship between a PON polling period and a scheduling information arrival interval of a terminal apparatus transmitted from each ONU Assigning a slot to the upstream band of each ONU.

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