JP6401666B2 - Communications system - Google Patents

Description

  The present invention relates to a communication system having a control means for controlling a PON (Passive Optical Network) band.

  In recent years, as shown in FIG. 1, a configuration in which a PON (Passive Optical Network) 10 is used as a relay NW between a wireless LAN NW 20 and a higher-level communication network 30 has become widespread. The PON 10 includes one or more optical subscriber line network devices ONU (Optical Network Unit) 11, a splitter 12, and an OSU (Optical Subscriber Unit) 13 in an optical subscriber line termination device OLT (Optical Line Terminal). The wireless LAN NW 20 includes an AP (Access Point) 21 and one or more wireless LAN terminals 22. The wireless LAN terminal 22 is connected to the PON 10 via the AP 21 and communicates with the upper communication network 30.

  The PON branches an optical signal by a splitter, which is a low-cost passive element, and shares one transmission path connected to the OSU with one or more ONUs to realize an economical NW. Therefore, by using the PON as a relay NW between the wireless LAN NW and the upper communication network, the cost reduction effect of the entire NW can be expected.

  The PON employs a WDM (Wavelength Division Multiplexing) method in which upstream signals addressed from the ONU to the OSU and downstream signals addressed from the OSU to the ONU use different wavelengths in order to realize single-fiber bidirectional communication with high transmission efficiency ( Non-patent document 1). As a result, an uplink signal and a downlink signal can be transmitted simultaneously, so that the uplink signal and the downlink signal are controlled independently.

  For the upstream signal in the PON, the OSU performs a bandwidth allocation method based on the upstream transmission request of each ONU, and notifies the upstream signal transmission start time and the upstream signal transmission period to each ONU so that the upstream signals do not collide. And controlled.

  An ONU can have one or more types of upstream transmission requests. For example, it is possible to notify the OSU of an uplink transmission request for a service belonging to a priority class such as an IP telephone and an uplink transmission request for a service belonging to a best effort class.

  The bandwidth allocation method allocates a bandwidth to each ONU based on the upstream transmission request of each ONU. For example, a method of allocating a band according to the ratio of the uplink transmission request amount of each ONU, or a method of allocating a band based on the accumulated value of the past uplink transmission data amount as in Non-Patent Document 2 can be considered. Non-Patent Document 2 proposes a method in which a bandwidth is first assigned to an uplink transmission request having a high priority and the remaining bandwidth is assigned to another uplink transmission request again. As a result, it is possible to perform bandwidth allocation according to the priority of the service.

  A downstream signal in the PON is broadcast from the OSU to all ONUs in a time division multiplexing (TDM) system, and the ONU that receives the downstream signal not destined for itself discards the data. Non-Patent Document 3 proposes a method of dynamically changing the ONU configuration accommodated by the OSU in order to distribute the downstream bandwidth fairly to each ONU.

FIG. 2 shows the result of allocating the downlink use band (FIG. 2 (a)) and the uplink use band (FIG. 2 (b)) of the PON 1 section to ONUs that desire transmission / reception fairly by the conventional band control method. Show. However, the bandwidth used by the ONU 1 and the ONU 2 in the network configuration of FIG. 1 is illustrated. Further, the uplink signal destined ONU1 in period t1 is not, rather than down signal from ONU1 In the period t2, the downlink signal addressed ONU1 in the period t4 did not. For example, in the period t1 and the period t4, the downstream band is equally distributed to ONU1 and ONU2 by 60 Mbps. In the period t2, by fairly 50M bps upstream bandwidth to ONU1 and ONU 2, in the period t3 and the period t4 is fairly allocate portions 30 Mbps.

IEEE Std. 802.3-2012 Cedric F.M. Lam, “Passive Optical Networks Principles and Practice,” Elsevier Inc. , P. 221-242. Yumiko Senoo, Shin Kaneko, Jun Sugawa, Toshiyuki Odaka, Shunji Kimura, Naoto Yoshimoto and Hideaki Kimura, "Dynamic-Load-Balancing Algorithm Suppressing the Number of Wavelength Reallocations for lambda-tunable WDM / TDM-PON", in Proc. of ECOC 2014, 2014

  For example, as shown in FIG. 3, when the wireless LAN NW1 (20-1) and the wireless LAN NW2 (20-2) using the same channel are close to each other, the wireless signals interfere with each other, and AP1 (21-1) and AP2 (21-2) cannot transmit and receive wireless signals at the same timing. Therefore, as shown in FIG. 4, the upstream / downstream signals of ONU 1 and ONU 2 share the upper limit band caused by the radio section.

  Thereby, the downlink use band in the PON1 section indirectly affects the uplink use band in the PON1 section via the radio section. For example, in the period t4, the ONU 2 uses a large amount of the downlink bandwidth in the PON 1 interval, so the downlink signal of the AP 2 compresses the uplink signal from each terminal in the wireless interval, and as a result, the uplink use bandwidth of each ONU in the PON 1 interval is Get smaller. That is, in the PON1 section, ONU2 uses a large amount of downstream bandwidth, and the upstream usage bandwidth of ONU1 is unfairly compressed.

  However, since the conventional bandwidth control method controls the upstream bandwidth and the downstream bandwidth independently in the PON section, it cannot achieve fair distribution of the bandwidth of the PON section to each ONU as shown in FIG. Note that this is a problem that may also occur when three or more wireless LAN NWs are close to each other.

  Accordingly, an object of the present invention is to provide a communication system that performs bandwidth control that enables fair distribution of the bandwidth of the PON section to each ONU in order to solve the above-described problems.

  In order to achieve the above object, the communication system according to the present invention is an ONU in which at least a part of upstream / downstream traffic shares a shared bandwidth resource under the ONU, such as ONUs that accommodate wireless LAN NWs under the control. When there is a set S0, the bandwidth control of the PON section is performed in consideration of both the uplink use band and the downlink use band of ONUs belonging to the set S0. Specifically, the communication system includes a determination unit that determines the control target ONU set S1 (S1⊆S0) based on information on the weighted total value of the uplink use band and the downlink use band of the ONUs belonging to the set S0, An instruction unit that instructs the corresponding ONU or / and OSU to perform bandwidth control on the ONUs belonging to the target set S1.

Specifically, the bandwidth control method of the communication system according to the present invention includes a single optical subscriber unit (OSU: Optical Subscriber Unit) and a plurality of optical subscriber line network devices (ONU: Optical Network Unit). PON (Passive Optical Network) connected in the above, and the ONU sharing at least a part of each other's bandwidth resources is set as set S0,
A determination procedure for determining, among ONUs belonging to the set S0, ONUs whose values relating to used bandwidths meet a predetermined determination condition as a set S1 (S1⊆S0) of control target ONUs;
An instruction procedure for instructing predetermined bandwidth control to ONUs belonging to the set S1;
It is characterized by performing.

  In this bandwidth control method, an ONU having a large bandwidth is detected, and control is performed so as to limit the bandwidth to the ONU. For this reason, this bandwidth control method detects ONU2 in the periods t1, t2, and t4 in FIG. 4 and controls the bandwidth of ONU2, so that the bandwidth can be fairly distributed between ONU1 and ONU2 as shown in FIG. . Therefore, the present invention can provide a communication system that enables fair distribution of the bandwidth of the PON section to each ONU.

  There are the following five specific communication system configurations that can implement this bandwidth control method.

The communication system according to the present invention includes a PON including a set of ONUs S0 in which one OSU and a plurality of ONUs are connected via a transmission line, and at least a part of the traffic shares bandwidth resources under the ONU. A system,
The OSU
A bandwidth control unit having a determination unit that performs the determination procedure of the bandwidth control method and an instruction unit that performs the instruction procedure;
A communication relay unit for notifying the band control unit of a value related to a used band, and controlling a band between the ONUs belonging to the set S1 based on an instruction of the predetermined band control from the band control unit;
It is characterized by providing.

The communication system according to the present invention includes a PON including a set of ONUs S0 in which one OSU and a plurality of ONUs are connected via a transmission line, and at least a part of the traffic shares bandwidth resources under the ONU. A system,
The ONU is
A bandwidth control unit having a determination unit that performs the determination procedure of the bandwidth control method and an instruction unit that performs the instruction procedure;
A communication relay unit that, when belonging to the set S1, notifies the band control unit of a value related to a used band, and controls the band with the OSU based on the predetermined band control instruction from the band control unit; ,
It is characterized by providing.

The communication system according to the present invention includes a PON including a set of ONUs S0 in which one OSU and a plurality of ONUs are connected via a transmission line, and at least a part of the traffic shares bandwidth resources under the ONU. A system,
The OSU
A bandwidth control unit having a determination unit that performs the determination procedure of the bandwidth control method;
A first communication relay unit for notifying the band control unit of a value relating to a used band, receiving information about ONUs belonging to the set S1 from the band control unit, and notifying that the ONUs belonging to the set S1 belong to the set S1;
With
The ONU is
A bandwidth control unit having an instruction unit for performing the instruction procedure of the bandwidth control method;
A second communication relay unit that controls a band with the OSU based on an instruction of the predetermined band control from the band control unit when belonging to the set S1;
It is characterized by providing.

In the communication system according to the present invention, one OSU and a plurality of ONUs are connected via a transmission line, and at least a part of the traffic is a PON having the set S0 of ONUs sharing the bandwidth resources under the ONU, A communication system including one relay device connected to an OSU,
The relay device is
A bandwidth control unit having a determination unit that performs the determination procedure of the bandwidth control method and an instruction unit that performs the instruction procedure;
A communication relay unit for notifying the band control unit of a value related to a used band, and controlling a band between the ONUs belonging to the set S1 based on an instruction of the predetermined band control from the band control unit;
It is characterized by providing.

In the communication system according to the present invention, one OSU and a plurality of ONUs are connected via a transmission line, and at least a part of the traffic is a PON having the set S0 of ONUs sharing the bandwidth resources under the ONU, A communication system including one relay device connected to an OSU,
The relay device is
A determination unit that performs the determination procedure of the bandwidth control method;
A first communication relay unit that notifies the band control unit of a value related to a used band, receives information on ONUs belonging to the set S1 from the band control unit, and notifies the ONUs belonging to the set S1 that it belongs to the set S1; ,
With
The ONU is
A bandwidth control unit having an instruction unit for performing the instruction procedure;
A communication relay unit for notifying the band control unit of a value related to a used band, and controlling a band between the ONUs belonging to the set S1 based on an instruction of the predetermined band control from the band control unit;
It is characterized by providing.

  The band control method can be realized by configuring the communication system as described above. Therefore, the present invention can provide a communication system that enables fair distribution of the bandwidth of the PON section to each ONU.

  The determination unit of the communication system according to the present invention is configured such that the value related to the used band used for the determination is a total value of the uplink used band and the downlink used band, and a total value of the uplink used band and the downlink used band weighted to at least one of them. Or a value obtained by dividing the total value by the transmission rate of the band resource under the ONU to be determined.

  The determination unit of the communication system according to the present invention is characterized in that the determination condition is set for each ONU.

  The determination unit of the communication system according to the present invention sets the determination condition according to a utilization rate of the band resource.

The predetermined bandwidth control instructed by the instruction unit of the communication system according to the present invention,
Priority control for preferentially allocating bandwidth to ONUs not belonging to the set S1;
Delay control for adding a delay to a signal passing through the ONU belonging to the set S1,
Discard control for discarding signals via ONUs belonging to the set S1;
Alternatively, at least two combinations of the priority control, the delay control, and the discard control,
It is characterized by being.

  The present invention can provide a communication system that enables fair distribution of the bandwidth of the PON section to each ONU.

It is a figure explaining the structure of the communication system relevant to this invention. It is a figure explaining the use band in the PON section of the communication system relevant to this invention. It is a figure explaining the structure of the communication system relevant to this invention. It is a figure explaining the subject of the communication system relevant to this invention. It is a figure explaining the use band in an ideal PON area. It is a figure explaining the structure of PON which concerns on this invention. 3 is a flowchart illustrating a bandwidth control method according to the present invention. 3 is a flowchart illustrating a bandwidth control method according to the present invention. 3 is a flowchart illustrating a bandwidth control method according to the present invention. 3 is a flowchart illustrating a bandwidth control method according to the present invention. 3 is a flowchart illustrating a bandwidth control method according to the present invention. 3 is a flowchart illustrating a bandwidth control method according to the present invention. It is a figure explaining the structure of the communication system which concerns on this invention. It is a figure explaining the structure of the communication system which concerns on this invention. It is a figure explaining the structure of the communication system which concerns on this invention. It is a figure explaining the structure of the communication system which concerns on this invention. It is a figure explaining the structure of the communication system which concerns on this invention.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are embodiments of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components.

(Embodiment 1)
FIG. 6 is a diagram illustrating the configuration of the PON 301 of the present embodiment. The PON 301 includes an ONU 11 and an OSU 13a. In FIG. 6, for the sake of explanation, only one ONU is connected to the OSU, but actually, a plurality of ONUs are connected to one OSU as shown in FIG. Each ONU is connected to a wireless LAN AP as shown in FIG. The APs are close to each other, radio signals interfere with each other, and radio signals cannot be transmitted / received at the same timing. This embodiment is an example in which the OSU 13a executes the bandwidth control method of the PON 301 in the state as shown in FIG.

  The OSU 13 a includes a communication relay unit 51 and a band control unit 52. The communication relay unit 51 relays communication between the bandwidth control unit 52, the ONU 11 connected to the OSU 13a, and the upper communication network 30 connected to the OSU 13a. The bandwidth control unit 52 executes a PON bandwidth control method. The bandwidth control unit 52 includes an interface unit 53, a determination unit 54, and an instruction unit 55. The interface unit 53 relays communication between the communication relay unit 51 and the determination unit 54 and communication between the communication relay unit 51 and the instruction unit 55. The determination unit 54 and the instruction unit 55 respectively execute a determination procedure and an instruction procedure described later.

The bandwidth control method of this embodiment is a PON (Passive Optical) in which one optical subscriber unit (OSU: Optical Subscriber Unit) and a plurality of optical subscriber line network devices (ONU: Optical Network Unit) are connected via a transmission path. Network ON), and the ONU sharing at least a part of the bandwidth resources under each other is set as set S0,
A determination procedure for determining, among ONUs belonging to the set S0, ONUs whose values relating to used bandwidths meet a predetermined determination condition as a set S1 (S1⊆S0) of control target ONUs;
An instruction procedure for instructing predetermined bandwidth control to ONUs belonging to the set S1;
It is characterized by performing.

  In the present embodiment, the band resource is described as a wireless LAN NW. The ONU accommodates the wireless LAN NW, and at least a part of the upstream / downstream traffic of the ONU shares bandwidth resources under the ONU. A set of ONUs in which at least a part of the upstream and downstream traffic shares the bandwidth resource under the control is set as set S0.

  When there is a set S0, the determination unit 54 controls the bandwidth based on at least one of the number of signals transmitted / received by ONUs belonging to the set S0, the signal length, header information, and the channel transmission speed of the subordinate wireless LAN NW. A set S1 (S1⊆S0) of ONUs to be determined is determined. Here, the signal indicates a data unit transferred by the PON. For example, an Ethernet (registered trademark) frame, a GTC frame, an IP packet, a TCP segment, a UDP segment, or the like can be considered, but other data units may be used.

  In addition, as a method of calculating the ONU use band, for example, a method of calculating the sum of the signal lengths of all signals relayed by the communication relay unit during a certain period and having the corresponding ONU as a transmission source or destination can be considered. . Other methods may be used as long as the calculation is based on at least one of the number of signals transmitted / received by the ONU, the signal length, and the header information.

As an example of the determination condition, there may be a condition that “if the sum of the uplink use band and the downlink use band of a certain ONU exceeds a certain value, the corresponding ONU is included in the set S1”. Alternatively, the ONU uplink use band and the downlink use band may be weighted, and the set S1 may be determined based on the total value. For example, rather than a simple sum of the uplink bandwidth in use and downlink bandwidth used, by using the total value to weight the downlink band used as a determination condition, the downlink bandwidth used relatively traffic larger than uplink signal The set S1 can be determined with emphasis on. Further, when there is no ONU that satisfies the determination condition, the control target set S1 may be an empty set.

The instruction unit 55 instructs the communication relay unit 51 to perform bandwidth control on the ONUs belonging to the control target set S1 based on the determination result of the determination unit 54. The predetermined bandwidth control instructed in the instruction procedure is
Priority control for preferentially allocating bandwidth to ONUs not belonging to the set S1;
Delay control for adding a delay to a signal passing through the ONU belonging to the set S1,
Discard control for discarding signals via ONUs belonging to the set S1;
Alternatively, at least two combinations of the priority control, the delay control, and the discard control.

  For example, as shown in FIG. 7, first, there is a method of allocating bandwidth to all ONUs that do not belong to the control target set S1 in the ONU set S accommodated by the OSU, and assigning the remaining bandwidth to ONUs belonging to the control target set S1. Conceivable. However, in FIG. 7, BWmax is the total amount of bandwidth that can be allocated in this cycle, and BW [j] is the upstream transmission request amount of ONU [j]. Further, as shown in FIG. 8, a method of assigning a bandwidth that is α (0 ≦ α <1) times the uplink transmission request to the ONUs belonging to the control target set S1 is also possible. Furthermore, as another example of bandwidth control, as shown in FIG. 9, a method for sequentially transmitting signals addressed to all ONUs not included in the set S1, or as shown in FIG. 10, included in the set S1. A method for sequentially transmitting signals from all non-ONUs, a method for discarding signals addressed to ONUs included in the set S1 as shown in FIG. 11, and an ONU included in the set S1 as shown in FIG. It is conceivable to discard the signal from.

  Unless otherwise specified, the PON bandwidth control method described above is also implemented in other embodiments.

An operation example of the bandwidth control method in the NW configuration of FIG. 3 and the used bandwidth of FIG. 4 is shown below. The ONU set S0 is {ONU1, ONU2}. In this example, the purpose of allocating the use vertical band equally set S0 in the PON section, controls the relevant ONU if it exceeds the sum of the uplink bandwidth used and downlink bandwidth used for ONU that "the 100M bps in determination unit subject Assume that the determination condition “included in set S1” is used. Further, the communication relay unit delays the downlink signal destined for the ONU belonging to the control target set S1 and the method of preferentially allocating the bandwidth to the ONU uplink transmission request that does not belong to the control target set S1, based on the instruction from the instruction unit. It is assumed that the band control is performed by using the method of adding 併 用 together.

In the period t1, ONU1, the total value of the downlink bandwidth used (0M bps) and upstream bandwidth in use (60M bps) (60Mbps) because below 100M bps, is not included in the control target set S1. Meanwhile, ONU 2, the total value of the uplink bandwidth in use (60M bps) and downlink bandwidth in use (60M bps) (120Mbps) is for more than 100M bps, included in the control target set S1. Therefore, the control target set S1 = {ONU2} is obtained as a determination result in the period t1.

The communication relay unit preferentially allocates a bandwidth to an upstream request of an ONU (that is, ONU1) that does not belong to the control target set S1, thereby suppressing the upstream bandwidth of the ONU2. In addition, the communication relay unit suppresses the downstream band of the ONU 2 by adding a delay to the downstream signal addressed to the ONU (that is, the ONU 2) belonging to the control target set S1. As a result of the above band control, as shown in FIG. 5, the band is allocated fairly in the period t1.

On the other hand, in the period t3 when the bandwidth is already allocated fairly to each ONU. Since no ONU that satisfies the determination condition exists and the control target set S1 is an empty set, bandwidth control is not executed.

  Note that the following information is exchanged between the functional units, and the bandwidth control method is executed. First, the communication relay unit 51 determines at least one information among the number of signals transmitted / received by at least one ONU, the signal length, header information, and the channel transmission rate of the subordinate wireless LAN via the interface unit 53. Send to. The determination unit 54 transmits at least information of the control target set S1 to the instruction unit 55. The instruction unit 55 transmits information related to a bandwidth control method (at least one of bandwidth allocation, delay addition, and signal discard) for at least one ONU to the communication relay unit 51 via the interface unit 53.

(Embodiment 2)
FIG. 13 is a diagram illustrating the configuration of the PON 302 according to the present embodiment. The PON 302 includes an ONU 11 a and an OSU 13. In FIG. 13, only one ONU is connected to the OSU for explanation, but actually, a plurality of ONUs are connected to one OSU as shown in FIG. Each ONU is connected to a wireless LAN AP as shown in FIG. The APs are close to each other, radio signals interfere with each other, and radio signals cannot be transmitted / received at the same timing. This embodiment is an example in which the ONU 11a executes the bandwidth control method of the PON 302 in the state shown in FIG.

  The ONU 11 a includes a communication relay unit 61 and a band control unit 62. The communication relay unit 61 relays communication between the bandwidth control unit 62, a terminal (AP or the like) connected to the ONU 11a, and the OSU 13 connected to the ONU 11a. The bandwidth control unit 62 includes an interface unit 63, a determination unit 64, and an instruction unit 65. The interface unit 63 relays communication between the communication relay unit 61 and the determination unit 64 and communication between the communication relay unit 61 and the instruction unit 65. The determination unit 64 and the instruction unit 65 execute the determination procedure and the instruction procedure described in the first embodiment, respectively.

A specific determination method of this embodiment will be described.
When the self ONU is included in the set S0, the determination unit 64 weights the uplink use band and the downlink use band of the self ONU, and the self ONU sets the set S1 (S1⊆S0) on the basis of information on the total value. It is determined whether it is included. The calculation method of the weighted total value of the uplink use band and the downlink use band of the own ONU is the same as that in the first embodiment. Further, the determination condition as to whether or not the own ONU is included in the control target set S1 is the same as that in the first embodiment.

  Based on the determination result of the determination unit 64, the instruction unit 65 instructs the communication relay unit 61 to execute band control when the own ONU is included in the control target set S1. The bandwidth control executed by the communication relay unit 61 includes a method of suppressing the uplink transmission request notified to the OSU 13 by α (0 ≦ α <1) times, a method of adding a delay to a signal transmitted by the own ONU, Execute at least one of the methods for discarding the signal transmitted by.

  The following information is exchanged between the functional units to execute the bandwidth control method. First, the communication relay unit 61 transmits at least one information out of at least the number of signals transmitted / received by itself, the signal length, header information, and the channel transmission rate of the subordinate wireless LAN to the determination unit 64 via the interface unit. . The determination unit 64 transmits at least information indicating whether or not the determination unit 64 is included in the control target set S1 to the instruction unit 65. The instruction unit 65 transmits at least information related to the bandwidth control method (at least any one of suppression of uplink transmission request, delay addition, and signal discard) to the communication relay unit 61 via the interface unit 63.

  The PON 302 has an advantage that functions necessary for the OSU can be simplified by executing the bandwidth control method in the ONU with respect to the PON 301 of FIG.

(Embodiment 3)
FIG. 14 is a diagram illustrating the configuration of the PON 303 of the present embodiment. The PON 303 includes an ONU 11b and an OSU 13b. In FIG. 14, for the sake of explanation, only one ONU is connected to the OSU, but actually, a plurality of ONUs are connected to one OSU as shown in FIG. Each ONU is connected to a wireless LAN AP as shown in FIG. The APs are close to each other, radio signals interfere with each other, and radio signals cannot be transmitted / received at the same timing. This embodiment is an example in which the bandwidth control method of the PON 303 is executed by the OSU 13b performing the determination procedure and the ONU 11b performing the instruction procedure in the state shown in FIG.

  The ONU 11b includes a communication relay unit 61 and a band control unit 62b. The communication relay unit 61 relays communication between the bandwidth control unit 62b, a terminal (AP or the like) connected to the ONU 11b, and the OSU 13b connected to the ONU 11b. The bandwidth control unit 62 b includes an interface unit 63 and an instruction unit 65. The interface unit 63 relays communication between the communication relay unit 61 and the instruction unit 65. The instruction unit 65 executes the instruction procedure described in the second embodiment.

  The OSU 13b includes a communication relay unit 51 and a bandwidth control unit 52b. The communication relay unit 51 relays communication between the bandwidth control unit 52b, the ONU connected to the OSU 13b, and the upper communication network 30 connected to the OSU 13b. The bandwidth control unit 52 b includes an interface unit 53 and a determination unit 54. The interface unit 53 relays communication between the communication relay unit 51 and the determination unit 54. The determination unit 54 executes the determination procedure described in the first embodiment.

  The following information is exchanged between the functional units to execute the bandwidth control method. First, the communication relay unit 51 determines at least one information among the number of signals transmitted / received by at least one ONU, the signal length, header information, and the channel transmission rate of the subordinate wireless LAN via the interface unit 53. Send to. The determination unit 54 transmits at least the information of the control target set S1 to the instruction unit 65 of the ONU 11b via the communication relay unit 51. The instruction unit 65 transmits information regarding the bandwidth control method (any of suppression of uplink transmission request, delay addition, and signal discard) to the own ONU to the communication relay unit 61 via the interface unit 63.

  The PON 303 has an advantage that functions required for the OSU can be simplified by executing an instruction procedure in the ONU with respect to the PON 301 of FIG. Further, the PON 303 has an advantage that a plurality of ONUs can be simultaneously determined by executing a determination procedure by the OSU with respect to the PON 302 of FIG.

  On the other hand, unlike the PON 301 and the PON 302, the PON 303 needs to newly exchange control signals between the OSU 13b and the ONU 11b in order to transmit the determination result of the determination unit 54 of the OSU 13b to the instruction unit 65 of the ONU 11b.

(Embodiment 4)
FIG. 16 is a diagram illustrating the configuration of the communication system 304 of the present embodiment. The communication system 304 includes an ONU 11c and a relay device 14a. In FIG. 16, the OSU between the relay apparatus and the ONU is omitted for the sake of explanation, but in reality, the OSU exists between the relay apparatus and the ONU as shown in FIG. 15. Each ONU is connected to a wireless LAN AP as shown in FIG. The APs are close to each other, radio signals interfere with each other, and radio signals cannot be transmitted / received at the same timing. This embodiment is an example in which the relay device 14a performs the determination procedure and the instruction procedure in the state shown in FIG. 15 to execute the bandwidth control method for the PON 1 in FIG.

  The relay device 14 a includes a communication relay unit 51 and a band control unit 52. The communication relay unit 51 relays communication between the bandwidth control unit 52, the ONU 11c connected to the relay device 13a, and the upper communication network 30 connected to the relay device 13a. The bandwidth control unit 52 executes a PON bandwidth control method. The bandwidth control unit 52 includes an interface unit 53, a determination unit 54, and an instruction unit 55. The interface unit 53 relays communication between the communication relay unit 51 and the determination unit 54 and communication between the communication relay unit 51 and the instruction unit 55. The determination unit 54 and the instruction unit 55 execute the determination procedure and the instruction procedure described in the first embodiment, respectively.

  Note that the following information is exchanged between the functional units, and the bandwidth control method is executed. First, the communication relay unit 51 determines at least one information among the number of signals transmitted / received by at least one ONU, the signal length, header information, and the channel transmission rate of the subordinate wireless LAN via the interface unit 53. Send to. The determination unit 54 transmits at least information of the control target set S1 to the instruction unit 55. The instruction unit 55 transmits information regarding a bandwidth control method (at least one of delay addition and signal discard) to at least one ONU to the communication relay unit 51 via the interface unit 53.

  The communication system 304 has an advantage that functions necessary for the OSU can be simplified by executing the bandwidth control method in the communication relay unit with respect to the PON 301 of FIG.

(Embodiment 5)
FIG. 17 is a diagram illustrating the configuration of the communication system 305 according to the present embodiment. The communication system 305 includes an ONU 11d and a relay device 13b. In FIG. 17, the OSU between the relay apparatus and the ONU is omitted for the sake of explanation, but in reality, the OSU exists between the relay apparatus and the ONU as shown in FIG. 15. Each ONU is connected to a wireless LAN AP as shown in FIG. The APs are close to each other, radio signals interfere with each other, and radio signals cannot be transmitted / received at the same timing. This embodiment is an example in which the relay device 14b performs the determination procedure and the ONU 11d performs the instruction procedure in the state as illustrated in FIG.

  The ONU 11b includes a communication relay unit 61 and a band control unit 62b. The communication relay unit 61 relays communication between the bandwidth control unit 62b, a terminal (AP or the like) connected to the ONU 11b, and the relay device 14b connected to the ONU 11b. The bandwidth control unit 62 b includes an interface unit 63 and an instruction unit 65. The interface unit 63 relays communication between the communication relay unit 61 and the instruction unit 65. The instruction unit 65 executes the instruction procedure described in the second embodiment.

  The relay device 14b includes a communication relay unit 51 and a band control unit 52b. The communication relay unit 51 relays communication between the bandwidth control unit 52b, the ONU connected to the relay device 13d, and the upper communication network 30 connected to the relay device 13d. The bandwidth control unit 52 b includes an interface unit 53 and a determination unit 54. The interface unit 53 relays communication between the communication relay unit 51 and the determination unit 54. The determination unit 54 executes the determination procedure described in the first embodiment.

  The following information is exchanged between the functional units to execute the bandwidth control method. First, the communication relay unit 51 determines at least one information among the number of signals transmitted / received by at least one ONU, the signal length, header information, and the channel transmission rate of the subordinate wireless LAN via the interface unit 53. Send to. The determination unit 54 transmits at least the information of the control target set S1 to the instruction unit 65 of the ONU 11d via the communication relay unit 51. The instruction unit 65 transmits information regarding the bandwidth control method (any of suppression of uplink transmission request, delay addition, and signal discard) to the own ONU to the communication relay unit 61 via the interface unit 63.

  The communication system 305 has an advantage that functions necessary for the relay apparatus can be simplified by executing an instruction procedure in the ONU with respect to the communication system 304 of FIG.

  On the other hand, unlike the communication system 304, the communication system 305 newly exchanges control signals between the relay device 14b and the ONU 11d in order to transmit the determination result of the determination unit 54 of the relay device 14b to the instruction unit 65 of the ONU 11d. Is required.

(Embodiment 6)
The present embodiment is an example in which priority control is executed by setting determination conditions for each ONU. This embodiment can be applied to any communication system configuration of the first to fifth embodiments.

  For example, when the priority ONU set P (P⊆S0), the threshold value T1, and the threshold value T2 (T1> T2) are set, “for the ONUs belonging to the set P, the weighted total value of the uplink use band and the downlink use band is the threshold value T1. In addition to the control target set S1 in addition to the control target set S1, if the weighted total value of the uplink use band and the downlink use band exceeds the threshold T2, the determination condition “is included in the control target set S1” Conceivable. Further, it may be determined whether or not to add to the control target set S1 for each ONU based on the weighted total value of the uplink use band and the downlink use band of at least one ONU. Further, here, the case where there is one priority ONU set is illustrated, but there may be a plurality of priority ONU sets.

(Embodiment 7)
In the bandwidth control method of the present embodiment, the value related to the used band used for the determination in the determination procedure is the sum of the uplink used band and the downlink used band, or at least one of the uplink used band and the downlink used band weighted. It is a value obtained by dividing the total value by the transmission rate of the band resource under the ONU to be determined.

  The present embodiment is an example in which the determination unit uses “band occupation time” as the determination condition of the control target set S1. When wireless LAN NWs with different channel transmission speeds share the same wireless band, for example, if bandwidth control is performed so that the used bandwidth is evenly distributed, wireless LAN NWs with lower channel transmission speeds occupy much transmission time. . Therefore, in this embodiment, a value obtained by dividing the weighted total value of the uplink use band and the downlink use band by the channel transmission speed of each subordinate wireless LAN NW is used as an index of the “band occupation time in the radio section” of each ONU. This is used as a determination condition in the determination procedure.

  The present embodiment can also be applied to the communication system configuration described in the first to fifth embodiments. Further, the priority control shown in the present embodiment and the sixth embodiment can be used in combination.

(Embodiment 8)
This embodiment is an example in which the determination condition is changed according to the utilization rate of the wireless section. Here, any ratio can be used as long as it is a ratio indicating the degree of signal congestion in the wireless section. For example, it is possible to use a ratio of a used band in a maximum transmission band of a wireless section, or it is possible to use a ratio of a period in which a signal is transmitted in a wireless section in a certain period.

  For example, when the period t, the utilization rate r, the threshold value T3, and the threshold value T4 (T3> T4), when the utilization rate of the radio section is continuously equal to or more than the period t, “uplink usage band and downlink use” The determination condition “if the total value of the bands exceeds the threshold value T4 is included in the control target set S1” is used. In other cases (normally), “the total value of the uplink use band and the downlink use band is the threshold value T3. A method of using a determination condition that “is included in the control target set S <b> 1 if exceeded” can be considered. Further, the determination condition may be changed according to the degree of congestion of the radio section based on the weighted total value of the uplink use band and the downlink use band of at least one ONU.

  The present embodiment is applicable to any communication system configuration shown in the first to fifth embodiments. In the present embodiment, priority control shown in the sixth embodiment may be used in combination, or band control based on the band occupation time shown in the seventh embodiment may be used in combination.

10, 301, 302, 303, 304, 305: Communication system 11, 11a, 11b, 11c, 11d: ONU
12: Splitters 13, 13a, 13b: OSU
14, 14a, 14b: Relay devices 20, 20-1, 20-2: Wireless LAN NW
21: AP
22: Terminal 30: Upper communication network 51, 61: Communication relay unit 52, 52b, 62, 62b: Band control unit 53, 63: Interface unit 54, 64: Determination unit 55, 65: Instruction unit

Claims (6)

One optical subscriber unit (OSU: Optical Subscriber Unit) and a plurality of optical subscriber line network devices (ONU: Optical Network Unit) are connected via a transmission path, and at least a part of the traffic is a band resource under the control of the ONU. A communication system including a PON (Passive Optical Network) having a set S0 of ONUs sharing
The OSU
Among ONUs belonging to the set S0, a determination unit that determines an ONU whose value relating to the used band matches a predetermined determination condition as the set S1 (S1⊆S0) of the control target ONUs, and a predetermined number of ONUs belonging to the set S1. A bandwidth control unit having an instruction unit for issuing an instruction for bandwidth control;
A communication relay unit for notifying the band control unit of a value related to a used band, and controlling a band between the ONUs belonging to the set S1 based on an instruction of the predetermined band control from the band control unit;
A communication system comprising: A communication system including a PON in which one OSU and a plurality of ONUs are connected via a transmission line, and at least a part of the traffic shares the set SO0 of the ONUs sharing the bandwidth resources under the ONU,
The ONU is
For its own ONU, determining unit, and its own ONU is given if it belongs to a set S1 determines its own ONU as a set S1 (S1⊆S0) of the controlled object ONU when the value related to the used bandwidth matches the predetermined determination condition A bandwidth control unit having an instruction unit for issuing an instruction for bandwidth control;
When the own ONU belongs to the set S1, the bandwidth control unit is notified of a value related to the used bandwidth, and the communication with the OSU is controlled based on the predetermined bandwidth control instruction from the bandwidth control unit A relay section;
A communication system comprising: A communication system including a PON in which one OSU and a plurality of ONUs are connected via a transmission line, and at least a part of the traffic shares the set SO0 of the ONUs sharing the bandwidth resources under the ONU,
The OSU
A bandwidth control unit having a determination unit that determines an ONU having a value related to a used band that matches a predetermined determination condition among the ONUs belonging to the set S0 as a set S1 (S1⊆S0) of control target ONUs;
A first communication relay unit that notifies the band control unit of a value related to a used band, receives information on ONUs belonging to the set S1 from the band control unit, and notifies the ONUs belonging to the set S1 that it belongs to the set S1; ,
With
The ONU is
A bandwidth control unit having an instruction unit for issuing a predetermined bandwidth control instruction when the notification that the own ONU belongs to the set S1 is received from the first communication relay unit ;
A second communication relay unit that controls a band with the OSU based on an instruction of the predetermined band control from the band control unit when the own ONU belongs to the set S1;
A communication system comprising: One ONU and a plurality of ONUs are connected via a transmission line, and at least a part of the traffic is a PON having the set S0 of ONUs sharing the bandwidth resources under the ONU, and one relay apparatus connected to the OSU A communication system including:
The relay device is
Among ONUs belonging to the set S0, a determination unit that determines an ONU whose value relating to the used band matches a predetermined determination condition as the set S1 (S1⊆S0) of the control target ONUs, and a predetermined number of ONUs belonging to the set S1. A bandwidth control unit having an instruction unit for issuing an instruction for bandwidth control;
A communication relay unit for notifying the band control unit of a value related to a used band, and controlling a band between the ONUs belonging to the set S1 based on an instruction of the predetermined band control from the band control unit;
A communication system comprising: One ONU and a plurality of ONUs are connected via a transmission line, and at least a part of the traffic is a PON having the set S0 of ONUs sharing the bandwidth resources under the ONU, and one relay apparatus connected to the OSU A communication system including:
The relay device is
A bandwidth control unit having a determination unit that determines an ONU having a value related to a used band that matches a predetermined determination condition among the ONUs belonging to the set S0 as a set S1 (S1⊆S0) of control target ONUs;
A first communication relay unit that notifies the band control unit of a value related to a used band , receives information on ONUs belonging to the set S1 from the band control unit, and notifies the ONUs belonging to the set S1 that it belongs to the set S1; ,
With
The ONU is
A bandwidth control unit having an instruction unit for issuing a predetermined bandwidth control instruction when the notification that the own ONU belongs to the set S1 is received from the first communication relay unit ;
A second communication relay unit that controls a band with the OSU based on an instruction of the predetermined band control from the band control unit when the own ONU belongs to the set S1 ;
A communication system comprising:   The determination unit determines whether the value related to the used band used for the determination is a total value of the uplink used band and the downlink used band, a total value of the uplink used band and the downlink used band weighted on at least one, or the total value. The communication system according to any one of claims 1 to 5, wherein the communication system is a value divided by a transmission rate of the band resource under the target ONU.

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