JP2019062315A - Station-side device, optical access network, and band allocation method - Google Patents

Abstract

To efficiently perform band allocation even when an ONU performing transmission of periodic and fixed amount of data, such as sensing data is connected.SOLUTION: A station-side device is used in an optical access network including a plurality of subscriber-side devices connected to the station-side device via an optical transmission line, and comprises a management table, allocation target selection means, and band allocation calculation means. The management table records the fixed data transmission period and fixed data transmission amount of an ONU for a sensor that periodically transmits a fixed amount of data. The allocation target selection means determines, from the fixed data transmission period, whether the ONU for a sensor performs data transmission in a next allocation period, and when the ONU for a sensor performs data transmission, adds the ONU for a sensor to the allocation target. The band allocation calculation means performs band allocation to the ONU for a sensor being the allocation target.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a station side apparatus, an optical access network, and a band allocation method.

  Unlike the 4th generation mobile communication system conforming to LTE (Long Term Evolution) -Advanced, the 5th generation mobile communication system (5G) is called IoT (Internet of Things), which is various communication devices connected to the Internet. It will be used in the future. With the spread of IoT, it is conceivable that a device (sensor) that periodically transmits fixed amount of data such as sensing data uses a 5G network.

  Each sensor is connected to a remote radio transmission / reception unit (RRH: Remote Radio Head) by a radio network. The RRH communicates with each sensor using an antenna.

  The baseband processing unit (BBU: Base Band Unit) modulates an IP (Internet Protocol) packet received from the upper network and sends it to the RRH as a downlink signal. Also, the BBU demodulates the upstream signal received from the RRH into an IP packet and sends it to the upper network.

  It is conceivable to use an optical access network represented by a passive optical subscriber network (PON: Passive Optical Network) as a network between the BBU and the RRH.

  The PON comprises one station-side device (OLT: Optical Line Terminal) provided in the station, a plurality of subscriber-side devices (ONU: Optical Network Unit) respectively provided in the subscriber's house, and an optical coupler. Be done. The OLT and ONU and the optical coupler are connected by a so-called star type optical fiber. In a star type optical fiber, a single core optical fiber is used for connection between the OLT and the optical coupler. The single core optical fiber is branched by the optical coupler and shared by a plurality of ONUs.

  In PON, upstream optical signals sent from each ONU to the OLT are combined by an optical coupler and transmitted to the OLT. On the other hand, downstream optical signals sent from an OLT to each ONU are demultiplexed by an optical coupler and transmitted to each ONU. Different wavelengths are assigned to the upstream optical signal and the downstream optical signal in order to prevent interference between the upstream optical signal and the downstream optical signal. In this case, the BBU is connected to the OLT. Also, each RRH is connected to the ONU one by one.

  In PON, various multiplexing techniques are used. Multiplexing techniques used in PON include time division multiplex (TDM) technology in which short segments on the time axis are allocated to each subscriber, and wavelength division multiplexing (WDM: wavelength division multiplex) in which different wavelengths are allocated to each subscriber 2.) Technology, Code Division Multiplexing (CDM) technology, etc., in which different codes are assigned to each subscriber.

  As a network between BBU and RRH, PON using TDM (TDM-PON) can be used. In the TDM-PON, control is performed on the OLT side so that the transmission time of each ONU does not overlap.

  Specifically, the OLT transmits a control signal called grant to each ONU. The grant includes the transmission start time and the transmission time, and the ONU receiving the grant transmits the uplink data signal according to the transmission start time and the transmission time in the grant. Thus, the OLT can control the transmission timings of all the connected ONUs.

  With the spread of 5G and IoT, in addition to the normal ONUs (hereinafter also referred to as communication ONUs), ONUs (hereinafter also referred to as sensor ONUs) that transmit sensing data from sensors are connected to the OLT. Cases are conceivable.

  In a sensor network configured by connecting one or more sensors to one RRH, a technology is used that simultaneously sends sensing data in synchronization with each sensor in consideration of power consumption. In addition, the amount of sensed data acquired by the sensor does not change substantially. Therefore, the sensor ONU transmits a fixed amount of data only at certain periodic timings, and unlike the normal communication ONU, it does not transmit data for most of the time.

  As described above, it is assumed that the communication ONU for transmitting variable amount data and the sensor ONU are mixed and connected to the optical access network.

  By the way, in the upstream signal in the optical access network, a band is allocated to each ONU at a constant time interval called an allocation period. As an allocation method, dynamic band allocation (SR-DBA: Status Reporting Dynamic Bandwidth Allocation) that performs band calculation based on the request amount notified from the ONU and fixed band allocation (FBA that performs band calculation without the information from the ONU) There are two types: Fixed Bandwidth Allocation).

  In SR-DBA, since bandwidth allocation is performed based on the demand amount of each ONU reported sequentially, appropriate bandwidth allocation is possible also for each ONU. Also in the FBA, it is possible to allocate a suitable band to each ONU by estimating the traffic of the next allocation cycle (for example, refer to Patent Document 1).

JP, 2016-220033, A

  However, in the above-described conventional example of the band allocation method, it is assumed that the communication ONU performs variable amount of data transmission every allocation cycle, regardless of whether it is SR-DBA or FBA. With the spread of IoT, it is assumed that the number of sensor ONUs that transmit sensing data one-by-one and do not transmit many times increases. In the conventional optical access network, it is not considered that the sensor ONU is connected, and in the next allocation cycle, calculation of band allocation is performed even for ONUs that do not transmit data, and is unnecessary. Reports and grants are being sent and received. As a result, waste occurs in the bandwidth allocation processing time, particularly in the bandwidth allocation calculation time.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a subscriber-side device that transmits data periodically and in a fixed amount such as sensing data, A station-side apparatus capable of efficiently performing band allocation, an optical access network including the station-side apparatus, and a band allocation method.

  In order to achieve the above-mentioned object, the station-side apparatus of the present invention is used in an optical access network configured by including a plurality of subscriber-side apparatuses connected to the station-side apparatus via an optical transmission line It comprises a table, allocation object selection means, and band allocation calculation means.

  The management table records the fixed data transmission period and the fixed data transmission amount of the sensor subscriber side apparatus that periodically transmits a fixed amount of data. The allocation target selection means determines whether or not each sensor subscriber's device transmits data in the next allocation cycle from the fixed data transmission cycle, and in the case of performing data transmission, the sensor subscriber's device Add to assignment target. The band allocation calculation means performs band allocation to the sensor subscriber side apparatus to be allocated. In the implementation of the station-side device according to the present invention, preferably, the band allocation calculation means, in addition to the sensor subscriber-side device to be assigned, has a bandwidth for the communication subscriber-side device other than the sensor subscriber-side device. Make an assignment. Furthermore, it is preferable to further include control signal generation means for generating a downlink control signal instructing transmission of uplink transmission data only to the communication subscriber side device and the sensor subscriber side device to be assigned.

  Further, according to a preferred embodiment of the station-side apparatus of the present invention, it is preferable to further comprise detection means for detecting whether the connected subscriber-side apparatus is the sensor subscriber-side apparatus. The detection means records the subscriber-side apparatus to be detected as a sensor subscriber-side apparatus in the management table, and the uplink transmission data of the two times received from the detection-target subscriber-side apparatus recorded in the management table The fixed data transmission cycle is acquired from the difference in reception time, and the maximum value of the data amount of uplink transmission data is recorded twice as the fixed data transmission amount in the management table, and the fixed data transmission cycle recorded in the management table , Instructs the subscriber-side device to be detected to transmit fixed data transmission amount and request amount, and the request amount is larger than a predetermined threshold, or when data transmission is not performed, or If the amount of data received by the station-side device is smaller than the amount of fixed data transmission and the difference between the amount of fixed data transmission and the amount of received data is larger than a predetermined threshold value, the inspection It updates the management table subscriber unit of interest as communication subscriber unit.

  The optical access network according to the present invention is configured to include the above-mentioned station-side device and a plurality of subscriber-side devices connected to the station-side device via an optical transmission path.

  Further, according to the band allocation method of the present invention, there is provided an optical access network including a station-side apparatus having a plurality of termination devices, and a plurality of subscriber-side apparatuses connected to the station-side apparatus via an optical transmission path. Used by the station side apparatus, and is configured with the following processes. First, in the sensor subscriber-side device addition process, the fixed data transmission period and the fixed data transmission amount of the sensor subscriber-side device that periodically transmits a fixed amount of data to each sensor subscriber-side device are The recorded management table is read, it is determined from the fixed data transmission cycle whether or not data transmission is to be performed in the next allocation cycle, and when data transmission is performed, the subscriber apparatus is added to the allocation target. Next, bandwidth allocation is performed for the subscriber-side apparatus to be allocated.

  The band allocation method of the present invention preferably further includes a step of adding a communication subscriber side apparatus other than the sensor subscriber side apparatus to the allocation target, which is performed before the band allocation process. Furthermore, a preferred embodiment of the bandwidth allocation method of the present invention further comprises the following steps. First, the subscriber-side apparatus to be detected is recorded in the management table as the sensor subscriber-side apparatus. Next, the fixed data transmission period is acquired from the difference between the reception times of the two uplink transmission data received from the subscriber device to be detected, which is recorded in the management table, and the data amount of the two uplink transmission data Is recorded in the management table as the fixed data transmission amount. Next, in the fixed data transmission cycle recorded in the management table, the data transmission of the fixed data transmission amount and the notification of the required amount are instructed to the subscriber-side device to be detected. Next, if the request amount is larger than a predetermined threshold value, if data transmission is not performed, or the amount of data received by the station apparatus is smaller than the amount of fixed data transmission, and fixed data If the difference between the transmission amount and the received data amount is larger than a predetermined threshold value, the management table is updated with the subscriber-side device to be detected as the communication subscriber-side device.

  According to the station-side apparatus, the optical access network, and the band allocation method of the present invention, only when transmitting data in the next allocation cycle to the sensor subscriber-side apparatus that transmits data in the fixed data cycle Allocate bandwidth. As a result, it is possible to reduce the bandwidth allocation processing time, particularly the bandwidth allocation calculation time.

It is a schematic diagram which shows the structural example of an optical access network. It is a figure which shows typically the mode of transmission / reception of ONU for sensors, and ONU for communication. It is a figure which shows the example of the management table with which the station side apparatus is equipped. It is a flowchart explaining the method to detect ONU for sensors. It is a flowchart explaining the zone | band allocation method. It is a figure which shows the number of ONUs for sensors, and the relationship of band allocation calculation time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the shapes, sizes, and arrangement relationships of respective components are merely schematically shown to the extent that the present invention can be understood. In addition, although preferred embodiments of the present invention will be described below, materials and numerical conditions of each component are merely preferred embodiments. Therefore, the present invention is not limited to the following embodiments, and many changes or modifications that can achieve the effects of the present invention can be made without departing from the scope of the configuration of the present invention.

(Constitution)
A station-side apparatus and an optical access network according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view showing a configuration example of an optical access network. FIG. 2 is a diagram schematically showing transmission and reception of the sensor ONU and the communication ONU. FIG. 3 is a diagram showing an example of a management table provided in the station-side device.

  The optical access network is configured by connecting one ONU to a plurality of ONUs via an optical transmission path 300. The optical transmission line 300 includes, for example, optical fibers 310 and 330 and an optical coupler 320.

  FIG. 1 shows a total of two ONUs of one sensor ONU 200 and one communication ONU 210. The number of sensor ONUs 200 connected to one OLT 100 may be two or more. The number of ONUs 210 for communication may be two or more, or zero.

  The sensor ONU 200 transmits data of a fixed data transmission amount only at a certain periodic time timing (fixed data transmission cycle) at which sensing data arrives from each device (sensor) 204.

  A remote radio transmission / reception unit (RRH: Remote Radio Head) 202 is connected to the sensor ONU 200. Each sensor 204 is connected to the RRH 202 by a wireless network. The RRH 202 performs transmission and reception with each sensor 204 using an antenna. Here, it is assumed that a communication terminal or the like that transmits a variable amount of data is not connected to the sensor ONU 200.

  The sensor ONU 200 transmits an upstream data signal (Data) to the OLT 100 in response to the grant (G) received from the OLT 100. Since the amount of data transmitted by the sensor ONU 200 is a fixed amount of fixed data transmission, the sensor ONU 200 may not transmit the required amount as a report (R).

  A so-called communication terminal 214 is connected to the communication ONU 210. In response to the grant (G) received from the OLT 100, the communication ONU 210 transmits an upstream data signal (Data) and a report (R) indicating the required amount to the OLT 100. Data received from the communication terminal 214 by the communication ONU 210 is not constant in period and amount, and the communication ONU 210 performs variable amount of data transmission for each allocation period.

  The sensor ONU 200 and the communication ONU 210 can have the same configuration, and since any conventionally known ONU can be used as each of them, detailed description will be omitted.

  Next, the configuration of the OLT 100 will be described.

  The OLT 100 includes an interface (IF) 102, a downstream signal transmission unit 104, an upstream signal reception unit 106, an OLT control unit 110, and a multiplexing / demultiplexing unit 108.

  The downstream signal transmission unit 104 generates a downstream electrical signal based on the downstream data signal received from the upper network (NW) 10 via the BBU 20 and the IF 102 and the downstream control signal received from the OLT control unit 110. The downstream signal transmission unit 104 converts the downstream electrical signal into a downstream optical signal, and then sends the downstream optical signal to each ONU via the multiplexing / demultiplexing unit 108.

  The upstream signal receiving unit 106 converts the upstream optical signal sent via the multiplexing / demultiplexing unit 108 into an upstream electrical signal. The upstream signal reception unit 106 sends an upstream data signal among the upstream electrical signals to the upper NW 10 via the IF 102, and sends an upstream control signal to the OLT control unit 110.

  The OLT control unit 110 implements each function means described later by executing a program and the like incorporated in advance. The OLT control unit 110 includes a control signal generation unit 112, a band allocation calculation unit 114, and a control signal reading unit 116 as functional units. The control signal reading means 116 reads the request amount from each ONU included in the upstream control signal sent as a report (R). The band allocation calculation means 114 allocates a band to each ONU based on the request amount read by the control signal reading means 116. The control signal generation means 112 generates grant (G) as a downlink control signal for notifying each ONU of the band allocated by the band allocation calculation means 114.

  The above-described configuration of the OLT can be realized in the same manner as the OLT used in the conventional PON, and thus the detailed description is omitted here.

  In the OLT according to the present invention, the OLT control unit 110 further includes a management table 120, as assignment means, assignment target selection means 122, sensor ONU detection means (hereinafter, also simply referred to as detection means) 124, redetection timer means. It has 126.

  The allocation object selection means 122 selects, for each allocation cycle, to which of the connected ONUs the band allocation is to be performed. The detection unit 124 detects whether the connected ONU is a sensor ONU 200 that periodically transmits a fixed amount of so-called sensing data or a communication ONU 210 that performs normal communication. The detection result of the detection unit 124 is recorded in the management table 120.

  As shown in FIG. 3, the management table 120 is divided into sensor ONUs and communication ONUs. As for the communication ONU, the ID number of the corresponding ONU is recorded. For the sensor ONU, the ID number of the corresponding ONU, the fixed data transmission cycle, and the fixed data transmission amount are recorded.

  Here, the fixed data transmission amount and the fixed data transmission cycle from the sensor ONU 200 may change due to a failure or addition of the sensor 204 or a change in setting. Therefore, the detection unit 124 periodically detects the sensor ONU 200 and updates the management table 120. The redetection timer means 126 may count the time until this redetection and notify the detection means 124.

(Operation)
A method of detecting the sensor ONU will be described with reference to FIG. FIG. 4 is a flowchart for explaining a method of detecting the sensor ONU.

  In S11, the detection means 124 records in the management table 120 all ONUs connected to the OLT, which are recognized by a normal discovery process or the like, as sensor ONUs. At the stage of S11, the fixed data transmission cycle and the fixed data transmission amount are not set yet.

  In S12, the band allocation calculation means 114 performs fixed band allocation in accordance with an instruction from the detection means 124, and the control signal generation means 112 generates a grant. The OLT sends a grant to each ONU and receives a first upstream data signal from the ONU. The data amount and the reception time included in the upstream data signal are recorded in the RAM or the like.

  In S13, as in S12, the OLT sends a grant to each ONU, and receives a second upstream data signal from the ONU. The data amount and the reception time included in the upstream data signal are recorded in the RAM or the like.

  In S14, the detection unit 124 records the difference between the two data reception times recorded in the RAM or the like in the management table 120 as a fixed data transmission cycle. The detection unit 124 also records the fixed data transmission amount in the management table 120 as well. Here, it is assumed that the fixed data transmission amount is the maximum value of the data amount included in the two received uplink data signals.

  In S15, the detection means 124 determines the next transmission time and transmission data amount based on the information of the management table 120. In accordance with an instruction from the detection means 124 based on this determination, the band allocation calculation means 114 performs fixed band allocation, and the control signal generation means 112 generates a grant.

  The ONU that has received the grant transmits an upstream data signal and sends the amount of data (required amount) remaining in the ONU as a report to the OLT.

  In S16, the detection means 124 determines whether the required amount is equal to or greater than a threshold. If the requested amount is larger than a certain threshold value, the ONU has requested that the OLT transmit a larger amount of data than the predetermined fixed data transmission amount. In this case (No), the detection unit 124 determines that the ONU does not transmit a fixed amount of data, that is, it is not a sensor ONU, and updates the management table 120 with the ONU as a communication ONU in S20. The threshold value may be appropriately set based on the variation in the amount of data that may occur when transmitting a fixed amount of data.

  If it is determined in S16 that the request amount is equal to or less than the threshold (Yes), the detection unit 124 then determines in S17 whether or not data is received. If data is not received, the detection unit 124 determines that this ONU does not periodically transmit data, that is, it is not a sensor ONU, and updates the table as a communication ONU in S20.

  If it is determined in S17 that data has been received (Yes), whether or not the difference between the amount of data actually received and the amount of fixed data transmission described in the management table is less than or equal to a threshold in S18. judge. If this difference is larger than the threshold value, it means that the ONU has transmitted a smaller amount of data than the fixed data transmission amount predetermined by the OLT. In this case (No), the detection unit 124 determines that this ONU does not transmit fixed amount data, that is, it is not a sensor ONU, and updates the management table 120 as a communication ONU in S20. As in the case of S16, the threshold value may be appropriately set based on the variation in the amount of data that may occur when data transmission of a fixed amount is performed.

  If it is determined in S18 that the difference between the actually received data amount and the fixed data transmission amount described in the management table is less than or equal to a certain threshold (Yes), the detection unit 124 updates the management table 120 End the process without

  The processes of S12 to S20 are performed in parallel or sequentially with respect to each ONU.

  In addition, in order to avoid an erroneous detection, it is good to repeat the process of S15-S19 in multiple times.

  The bandwidth allocation method of this embodiment will be described with reference to FIG. FIG. 5 is a flowchart for explaining the band allocation method.

  This process is performed every allocation cycle.

  In S21, the allocation object selection unit 122 reads the management table 120, and adds all the communication ONUs to the allocation object based on the information.

  In S22, the allocation object selection unit 122 reads the management table 120, and selects one sensor ONU based on the information.

  In S23, the allocation object selection unit 122 determines whether to transmit data in the next allocation cycle from the fixed data transmission cycle of the selected sensor ONU. If data transmission is not performed (No), it is determined whether or not all the sensor ONUs have been selected in S25. If not (No), another sensor ONU is selected again in S22. . When data transmission is performed in S23 (Yes), the sensor ONU is added to the allocation target in S24, and the determination in S25 is performed.

  If it is determined in S25 that all ONUs for data transmission have been selected (Yes), the bandwidth allocation calculation unit 114 performs dynamic bandwidth allocation processing in S26. Here, a so-called best-effort band allocation is performed in which a bandwidth for reporting is allocated to the allocation target ONU, and the remaining allocatable area is allocated according to the required amount of each ONU. This band allocation can be performed as conventionally known.

  The best effort bandwidth allocation is performed, for example, as follows. First, the minimum guaranteed bandwidth is allocated to all allocation target ONUs. Thereafter, the remaining request amount from each ONU is allocated to the allocatable bandwidth excluding the minimum guaranteed bandwidth according to the ratio.

  After that, the control signal generation unit 112 generates a downlink control signal instructing transmission of uplink transmission data only to the allocation target ONU.

(effect)
The effects of the bandwidth allocation of the present invention are examined by numerical calculation.

  FIG. 6 is a diagram showing the relationship between the number of sensor ONUs and the bandwidth allocation calculation time. In FIG. 6, the abscissa represents the number of sensor ONUs, and the ordinate represents the bandwidth allocation calculation time (nsec). The bandwidth allocation calculation time mainly depends on the access time to the memory, such as writing to the memory and reading from the memory. Here, the access time to the memory is 49.5 nsec including the processing delay for both writing and reading.

  Here, the method of detecting the sensor ONU described with reference to FIG. 4 is ended, and whether or not all the connected ONUs are sensor ONUs, fixed data transmission in the case of the sensor ONU It is assumed that the OLT grasps the period and the fixed data transmission amount.

  The process of the present invention is S21 to S26 shown in FIG. 5, and the process in the prior art is only S26. In the present invention, S26 is performed only for the ONU to be allocated next time, but in the prior art, it is performed for all ONUs.

  FIG. 6A shows a case where N (N is an integer of 2 or more) ONUs are connected to the OLT, one ONU is a communication ONU, and the remaining N-1 are sensor ONUs. ing. In FIG. 6A, the band allocation calculation time in the present invention is indicated by I, and the band allocation calculation time in the prior art is indicated by II.

  The number of memory accesses is 10N-9 in the processes of S21 to S25. Also, in the process of S26, 25N + 1 times.

  For example, even if all sensor ONUs do not transmit data in the next allocation cycle, conventionally, 25N + 1 memory accesses are made in the process of S26.

  On the other hand, in the present invention, since the process of S26 is performed only for one communication ONU, 26 (= 25 × 1 + 1) memory accesses are performed. Therefore, the number of memory accesses is 10N-9 + 26 = 10N + 19 in all of S21 to S26. Therefore, the memory access count is reduced by about 60%, ie, the bandwidth allocation calculation time is reduced, as compared with 25N + 1 in the prior art.

  FIG. 6B shows a case where 100 ONUs are connected to the OLT, K ONUs (K is an integer of 1 or more) are sensor ONUs, and the remaining 100-K are communication ONUs. ing. In FIG. 6B, the band allocation calculation time in the present invention is indicated by III, and the conventional band allocation calculation time is indicated by IV.

  As in FIG. 6A, when all the sensor ONUs do not transmit data in the next allocation cycle, the number of memory accesses, ie, the bandwidth allocation calculation time is equal to the number of sensor ONUs in the conventional method. It becomes constant regardless of it. On the other hand, in the method of the present invention, as the number (percentage) of sensor ONUs increases, the number of memory accesses, that is, the bandwidth allocation calculation time decreases.

  Thus, the band allocation method of the present invention is more effective particularly when the ratio of sensor ONUs is large.

  Here, although the bandwidth allocation calculation time has been described, the bandwidth of the present invention can be obtained in consideration of transmission times of reports (R) and grants (G), intervals between grants to multiple ONUs (IPG: Inter Packet Gap), etc. The reduction effect of the bandwidth allocation processing time by the allocation method is further increased.

10 top NW
20 BBU
100 OLT
102 IF
104 downlink signal transmitter 106 uplink signal receiver
108 combining / splitting unit 110 OLT control unit 112 control signal generating means 114 band allocation calculating means 116 control signal reading means 120 management table 122 allocation object selecting means 124 detecting means 126 redetection timer means 200 sensor ONU
202 RRH
204 Sensor 210 ONU for communication
214 communication terminal 300 optical transmission line 310, 330 optical fiber 320 optical coupler

Claims (10)

A station-side apparatus for use in an optical access network configured to include a station-side apparatus and a plurality of subscriber-side apparatuses connected to the station-side apparatus via an optical transmission path,
A management table in which a fixed data transmission period and a fixed data transmission amount of the sensor subscriber unit that periodically transmits a fixed amount of data are recorded;
From the fixed data transmission cycle, it is determined whether or not each sensor subscriber's side device transmits data in the next assignment cycle, and when data transmission is performed, the sensor subscriber side device is added to the assignment target Allocation object selection means,
A station-side apparatus comprising: band allocation calculation means for performing band allocation to the sensor subscriber-side apparatus to be allocated. In the management table, communication subscriber side devices other than the sensor subscriber side device are also recorded,
The assignment target selection means adds all the communication subscriber side devices to the assignment target,
2. The station-side apparatus according to claim 1, wherein said band allocation calculation means performs band allocation to said subscriber-side apparatus for communication in addition to said subscriber-side apparatus for sensor assignment. further,
The communication subscriber side device and control signal generation means for generating a downlink control signal for instructing transmission of uplink transmission data only to the sensor subscriber side device to be assigned are characterized. The station side apparatus described in. further,
A detection unit that detects whether the connected subscriber unit is the sensor subscriber unit;
The detection means is
The subscriber side device to be detected is recorded in the management table as a sensor subscriber side device,
The fixed data transmission cycle is acquired from the difference between the reception times of the two uplink transmission data received from the subscriber device to be detected, which is recorded in the management table, and the data amount of the two uplink transmission data Record the maximum value of the fixed data transmission amount in the management table,
In the fixed data transmission cycle recorded in the management table, instructing the subscriber side apparatus of the detection target to transmit the data of the fixed data transmission amount and the request amount,
If the request amount is larger than a predetermined threshold value, if data transmission is not performed, or the amount of data received by the station apparatus is smaller than the amount of fixed data transmission, and the fixed data When the difference between the transmission amount and the received data amount is larger than a predetermined threshold value, the management table is updated with the subscriber-side device to be detected as the communication subscriber-side device. The station side apparatus according to claim 2 or 3. A station-side apparatus for use in an optical access network configured to include a station-side apparatus and a plurality of subscriber-side apparatuses connected to the station-side apparatus via an optical transmission path,
The subscriber side device to be detected is recorded in the management table as a sensor subscriber side device,
The fixed data transmission cycle is acquired from the difference between the reception times of the two uplink transmission data received from the subscriber device to be detected, which is recorded in the management table, and the data amount of the two uplink transmission data Record the maximum value of the fixed data transmission amount in the management table,
In the fixed data transmission cycle recorded in the management table, instructing the subscriber side apparatus of the detection target to transmit the data of the fixed data transmission amount and the request amount,
If the request amount is larger than a predetermined threshold value, if data transmission is not performed, or the amount of data received by the station apparatus is smaller than the amount of fixed data transmission, and the fixed data When the difference between the transmission amount and the received data amount is larger than a predetermined threshold value, detection means is provided for updating the management table with the subscriber-side device to be detected as the communication subscriber-side device. The station side apparatus according to claim 2 or 3, characterized in that An optical system comprising: the station-side apparatus according to any one of claims 1 to 5; and a plurality of subscriber-side apparatuses connected to the station-side apparatus via an optical transmission path. Access network. The station-side apparatus used in an optical access network comprising a station-side apparatus having a plurality of termination apparatuses and a plurality of subscriber-side apparatuses connected to the station-side apparatus via an optical transmission path It is a band allocation method, and
Reads the management table in which the fixed data transmission period and fixed data transmission amount of the sensor subscriber side device that transmits fixed amount data periodically to each sensor subscriber side device are recorded and fixed data transmission From the cycle, it is determined whether data transmission is to be performed in the next allocation cycle, and in the case of data transmission, a sensor subscriber side apparatus addition process for adding the subscriber side apparatus to the allocation target;
A band allocation method comprising: a band allocation process of allocating a band to a subscriber-side apparatus to be allocated. further,
The bandwidth allocation method according to claim 7, further comprising: adding a communication subscriber device other than the sensor subscriber device to the allocation target, which is performed before the bandwidth allocation process. Recording a subscriber-side device to be detected as the sensor subscriber-side device in the management table;
The fixed data transmission cycle is acquired from the difference between the reception times of the two uplink transmission data received from the subscriber device to be detected, which is recorded in the management table, and the data amount of the two uplink transmission data Recording the maximum value of the fixed data transmission amount as the fixed data transmission amount in the management table;
Instructing the subscriber-side device to be detected to transmit data of the fixed data transmission amount and notification of the required amount in the fixed data transmission cycle recorded in the management table;
If the request amount is larger than a predetermined threshold value, if data transmission is not performed, or the amount of data received by the station apparatus is smaller than the amount of fixed data transmission, and the fixed data If the difference between the transmission amount and the received data amount is larger than a predetermined threshold value, updating the management table with the subscriber-side device to be detected as the communication subscriber-side device The bandwidth allocation method according to claim 8, characterized in that: Recording a subscriber-side device to be detected as a sensor subscriber-side device in a management table;
The fixed data transmission cycle is acquired from the difference between the reception times of the two uplink transmission data received from the subscriber device to be detected, which is recorded in the management table, and the data amount of the two uplink transmission data Recording the maximum value of the fixed data transmission amount as the fixed data transmission amount in the management table;
Instructing the subscriber-side device to be detected to transmit data of the fixed data transmission amount and notification of the required amount in the fixed data transmission cycle recorded in the management table;
If the request amount is larger than a predetermined threshold value, if data transmission is not performed, or the amount of data received by the station apparatus is smaller than the amount of fixed data transmission, and the fixed data If the difference between the transmission amount and the received data amount is larger than a predetermined threshold value, updating the management table with the subscriber-side device to be detected as the communication subscriber-side device A bandwidth allocation method characterized by

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