JP4527696B2 - Optical communication network connection device, bandwidth guarantee method, and program - Google Patents

Description

  The present invention relates to an optical communication network connection apparatus, and more particularly to an optical communication network connection apparatus that guarantees a bandwidth for communication with a low transmission priority.

  GE-PON (Gigabit Ethernet (registered trademark) -Passive Optical Network), in which an upstream communication band is dynamically allocated, is like a voice data of VoIP (Voice over IP) because a transmission band is dynamically allocated. For communications that must be transmitted regularly, priority is defined according to the usage of each communication.

  However, the transmission assignment by the conventional priority setting has the following problems.

  The first problem is that communication with a low priority has a large delay due to a decrease in the total amount of data frames that can be transmitted when there is a large amount of data due to high priority communication. Occurs.

  The second problem is that communication with a low priority is delayed in the buffer when data is sent in large quantities by another communication of the same ONU (Optical Network Unit) when the bandwidth that can be transmitted is small. It cannot be sent.

  That is, conventionally, in GE-PON, if priority control is performed for voice communication or streaming in which data delay is not preferable, the communication band for communication with a low priority is limited, and transmission is performed. May be delayed or communication may not be established due to timeout.

As a related technique, Japanese Unexamined Patent Application Publication No. 2003-244178 (Patent Document 1) discloses a method for implementing operation in a Gigabit Ethernet (registered trademark) passive optical network system and its Ethernet (registered trademark) frame structure.
This GE-PON system configures upward and downward frames based on variable-length Ethernet (registered trademark) frames, and uses a TDM (Time Division Multiplexing) system for upward transmission in a point-to-multipoint tree structure. Adopted. Therefore, the present invention provides a variable length Ethernet (registered trademark) frame format structure capable of efficiently accommodating Gigabit Ethernet (registered trademark) traffic in the GE-PON system, and this variable length Ethernet (registered trademark). The GE-PON function execution process related to the frame, that is, initial ONU registration, additional ONU registration, ranging, dynamic bandwidth allocation, and the like are performed.

Japanese Patent Laid-Open No. 11-8663 (Patent Document 2) discloses a data transmission method and a data transmission apparatus.
In this prior art, priority is set for data to be transmitted according to the type of data. This priority defines the relationship between a plurality of different types of data. Data is transmitted by a method determined in accordance with the priority, and the status of the transmission target data is examined to determine whether transmission can be performed so as to meet the requested condition. As a result, if necessary, the priority of the untransmitted data is changed so that transmission that meets the requested condition is possible.

JP 2003-244178 A Japanese Patent Laid-Open No. 11-8663

  An object of the present invention is to provide an optical communication network connection apparatus that does not delay transmission or disconnect communication even in low-priority communication in GE-PON that dynamically allocates transmission bands. It is.

  In the following, means for solving the problem will be described using the numbers used in [Best Mode for Carrying Out the Invention] in parentheses. These numbers are added to clarify the correspondence between the description of [Claims] and [Best Mode for Carrying Out the Invention]. However, these numbers should not be used to interpret the technical scope of the invention described in [Claims].

The optical network connection device of the present invention includes a guarantee condition setting unit (115) in which a transmission guarantee condition for guaranteeing communication is set, and a transmission priority determining unit (104) for discriminating communication that has not been performed under the transmission guarantee condition. A communication determination unit (105) for extracting information for identifying communication, a transmission data table (113) for storing information for identifying communication, and a transmission data table (113), And a transmission unit (110) for preferentially transmitting data to the dynamically allocated uplink band based on information for identifying communication and holding communication.
As a result, in the terminal ONU that is connected to the GE-PON to which the transmission band is dynamically allocated, the transmission interval is guaranteed for the communication whose transmission priority is set low, and is low regardless of the communication state of the ONU. Priority communication can be continued.

  The optical communication network connection apparatus of the present invention includes a low priority queue (106) for storing data frames determined as low priority by the transmission priority determination unit (104) until transmission, and a transmission priority determination unit ( 104) a high priority queue (107) that stores data frames determined to have a high priority until transmission, and a data frame that is actually transmitted in accordance with the dynamically allocated uplink band. 106) or a transmission allocation control unit (108) that acquires from the low priority queue (106) and stores it in the transmission buffer (109).

  The optical communication network connection apparatus of the present invention changes the configuration of data scheduled to be transmitted when there is communication to be guaranteed corresponding to the transmission guarantee condition, and the transmission allocation control unit (108) sets the transmission buffer (109). It further includes a control unit (101) that inserts a data frame of communication that has not been transmitted for a specified time and executes transmission.

  The control unit (101) replaces a communication data frame that has not been transmitted for a specified time with a communication data frame for which the specified time has not elapsed.

  The control unit (101) changes the construction of the data scheduled to be transmitted for the data frame stored in the transmission buffer (109).

  The transmission guarantee condition is an elapsed time after communication is performed.

  The transmission guarantee condition is a communication transmission speed.

  Another optical communication network connection apparatus of the present invention includes an optical connection unit (103) for connecting an optical line (35), a network connection unit for connecting to a communication terminal (40), and a communication terminal (40). A transmission priority determination unit (104) that determines a data frame received from the communication with high priority and low communication according to a certain rule, and communication for extracting destination information and transmission source information in a data frame with low priority A determination unit (105), a low priority queue (106) that stores data frames determined to be low priority by the transmission priority determination unit (104) until transmission, and a transmission priority determination unit (104) A high-priority queue (107) that stores data frames determined to have a high priority until transmission, and a transmission buffer that stores data frames that have been dynamically allocated and whose transmission has already been confirmed. The data frame to be actually transmitted is acquired from the low priority queue (106) or the low priority queue (106) and stored in the transmission buffer (109) according to the group (109) and the dynamically allocated uplink band. Low-priority communication is not transmitted with the transmission allocation control unit (108) and the transmission unit (110) that transmits the data frame stored in the transmission buffer (109) via the optical connection unit (103). Identifying the communication extracted by the timer (116) for counting time, the timer setting unit (117) for setting the maximum time interval guaranteed for low priority communication, and the communication determining unit (105) A transmission data table (113) for storing information to be received, and a reception unit (1) for receiving downlink data from the optical line (35) via the optical connection unit (103) And 2) comprises a receiving analyzing unit for extracting a bandwidth allocation to uplink from the received data frame by the receiving unit (112) (113).

  The bandwidth guarantee method and program of the present invention include (A) a step of discriminating a communication that has not been performed under a transmission guarantee condition for guaranteeing a communication, (B) a step of extracting information for identifying the communication, and (C And a step of preferentially transmitting data to the dynamically allocated uplink band based on information for identifying the communication and maintaining the communication.

  The bandwidth guarantee method and program of the present invention include (D) storing a data frame determined to be low priority in the low priority queue (106), and (E) high data frame determined to be high priority. A step of storing in the priority queue (107), and (F) acquiring a data frame to be actually transmitted from the low priority queue (106) or the low priority queue (106) according to the dynamically allocated upstream bandwidth. And storing in the transmission buffer (109).

  In the bandwidth guarantee method and program of the present invention, (G) when there is communication to be guaranteed corresponding to the transmission guarantee condition, the configuration of data scheduled to be transmitted is changed, and the transmission allocation control unit (108) changes the transmission buffer (109). ) Further includes a step of executing transmission by inserting a data frame of communication that has not been transmitted for a specified time.

  The bandwidth guarantee method and program of the present invention further comprise (H) a step of replacing a communication data frame that has not been transmitted for a specified time with a communication data frame that has not been transmitted for a specified time.

  The bandwidth guarantee method and program of the present invention further comprise (I) a step of changing the construction of data scheduled to be transmitted with respect to the data frame stored in the transmission buffer (109).

  Other bandwidth guarantee methods and other programs of the present invention include (a1) a step of performing communication with the communication terminal (40), and (a2) a step of determining whether or not the transmission priority is set high for the communication. (A3) when it is determined that the priority of the data frame to be transmitted is high, the step of storing the data frame in the high priority queue (107), and (a4) the priority of the data frame to be transmitted is low If the determination is made, the step of extracting the identification information that makes it possible to determine that the communication is the same in the communication data, storing it in the transmission data table (113), and storing the data frame in the low priority queue (106); (A5) A transmittable bandwidth dynamically allocated is detected, and a data frame is transmitted from the low priority queue (106) or the high priority queue (107) under a predetermined condition. A step of writing to the buffer (109); and (a6) searching for data frame information in the low priority queue (106) from the data frame information registered in the transmission data table (113), and for each communication A step of determining whether there is communication to be guaranteed corresponding to the transmission guarantee condition for (a7), and if there is communication to be guaranteed corresponding to the transmission guarantee condition, the configuration of data scheduled to be transmitted is changed. And (a8) a step of transmitting the data frame stored in the transmission buffer (109).

  The step (a7) refers to (a71) the transmission data table (113), confirms the communication that has passed the set time by the elapsed time, and (a72) has passed the set time. Inserting the data frame into the transmission buffer (109) so that the communication data frame can be transmitted at the head of the transmission permitted band.

As a first effect, since a frame to be transmitted is changed after transmission band assignment is completed by DBA (Dynamic Bandwidth Allocation), transmission at a constant interval can be guaranteed.
As a second effect, since transmission at a constant interval can be guaranteed, communication can be continuously established regardless of the congestion state of the ONU (Optical Network Unit).
As a third effect, a large number of communications can be continuously established even when transmission band allocation from an OLT (Optical Line Terminal) is very small.

A first embodiment of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the bandwidth guarantee system of the present invention includes an ONU (Optical Network Unit) 10, an OLT (Optical Line Terminal) 20, a coupler 30, an optical line 35, and a communication terminal 40. It is out.

  The ONU 10 is installed in a subscriber's home in a GE-PON (Gigabit Ethernet (registered trademark) -Passive Optical Network) in which one optical fiber is shared by a plurality of subscribers. The OLT 20 is installed in a center station in a GE-PON in which one optical fiber is shared by a plurality of subscribers. The coupler 30 branches the line for a plurality of subscribers in the GE-PON. The optical line 35 is capable of optical communication defined by IEEE 802.3ah. The communication terminal 40 can be connected to the ONU 10 via a LAN.

  The ONU 10 includes a control unit 101, an optical connection unit 102, a LAN connection unit 103, a transmission priority determination unit 104, a communication determination unit 105, a low priority queue 106, a high priority queue 107, A transmission allocation control unit 108, a transmission buffer 109, a transmission unit 110, a transmission data table 111, a reception unit 112, a reception analysis unit 113, a reception control unit 114, and a guarantee condition setting unit 115 are provided.

  The control unit 101 supervises the operation of the ONU 10. The optical connection unit 102 is an interface for connecting the optical line 35. The LAN connection unit 103 is an interface capable of connecting the communication terminal 40 via a LAN. The transmission priority determination unit 104 determines a data frame that has entered from the communication terminal 40 via the LAN connection unit 103 as communication with high priority and communication with low priority according to a certain rule. The communication determination unit 105 extracts “destination IP address” and “source IP address” in the low priority data frame. The low priority queue 106 stores data frames determined as low priority by the transmission priority determination unit 104 until transmission. The high priority queue 107 stores data frames determined to have a high priority by the transmission priority determination unit 104 until transmission. The transmission allocation control unit 108 acquires a data frame to be actually transmitted from the low priority queue 106 or the high priority queue 107 according to the uplink band dynamically allocated by DBA (Dynamic Bandwidth Allocation) of GE-PON, Store in the transmission buffer 109. In DBA, GE-PON specified in IEEE 802.3ah and dynamic allocation of an upstream band are performed. The transmission buffer 109 stores a data frame in which a bandwidth is dynamically allocated and transmission is already determined. The transmission unit 110 transmits the data frame stored in the transmission buffer 109 via the optical connection unit 102. The transmission data table 111 stores information for identifying the communication extracted by the communication determination unit 105. The receiving unit 112 receives downlink data from the optical line 35 via the optical connection unit 102. The reception analysis unit 113 extracts the bandwidth allocation in the uplink direction from the data frame received by the reception unit 112. The reception control unit 114 processes other received data. The guarantee condition setting unit 115 stores transmission guarantee conditions for each registered communication.

The basic operation of the present invention will be described with reference to the flowchart of FIG.
(1) Step S101
In the ONU 10 which is a GE-PON terminal terminal that can be connected to the GE-PON station side apparatus OLT 20 placed in the telephone exchange via the optical line 35 and can be connected to a communication terminal 40 such as a personal computer, the communication terminal 40 Communicate with the OLT 20.
(2) Step S102
At this time, the transmission priority determination unit 104 determines whether or not the transmission priority setting is high.
(3) Step S103
When communication with a high transmission priority setting is performed from the communication terminal 40 to the OLT 20, the data frame to be transmitted is determined to have a high priority by the transmission priority determination unit 104 of the ONU 10, and then the high priority Stored in the queue 107. The stored data frame is transmitted to the OLT 20 by the transmission unit 110.
(4) Step S104
When communication with a low transmission priority setting is performed from the communication terminal 40 to the OLT 20, the data frame to be transmitted is determined to be low in priority by the transmission priority determination unit 104 of the ONU 10, and then in the communication data The information that makes it possible to determine that the communication is the same is extracted by the communication determination unit 105, and the information extracted by the communication determination unit 105 is stored in the transmission data table 111.
(5) Step S105
Further, the transmission priority determination unit 104 stores the data frame in the low priority queue 106.
(6) Step S106
When the control unit 101 of the ONU 10 detects the transmittable bandwidth dynamically allocated by the DBA from the OLT 20 by the reception analysis unit 113, the transmission allocation control unit 108 determines the DBA from the low priority queue 106 and the high priority queue 107. The data frame is written into the transmission buffer 109 under the conditions that are satisfied.
(7) Step S107
Here, the data frame information registered in the transmission condition table 111 is searched from the data frame information registered in the transmission data table 111, and the communication for each communication registered in the guarantee condition setting unit 12 is searched. It is determined whether there is communication to be guaranteed corresponding to the transmission guarantee condition.
(8) Step S108
When there is a communication to be guaranteed corresponding to the transmission guarantee condition for each communication registered in the guarantee condition setting unit 12, the control unit 101 changes the configuration of data scheduled to be transmitted, and the transmission allocation control unit 108 Thus, the communication data frame that has not been transmitted for the specified time is inserted into the transmission buffer 109. That is, this data frame is interrupted in the data frame to be transmitted.
(9) Step S109
The transmission unit 110 transmits the data frame stored in the transmission buffer 109 to the OLT 20.

  In this operation, with respect to the dynamically allocated uplink band, the communication data frame to be guaranteed the transmission interval corresponding to the contents of the guarantee condition setting unit 12 is changed, and the configuration of the allocated transmission band is changed. And transmitting.

With reference to FIG. 3, the connection structure and internal structure of 2nd Embodiment of this invention are demonstrated.
The configuration of this embodiment is the same as in FIG. 1. In the GE-PON in which one optical fiber is shared by a plurality of subscribers, the ONU 10 installed in the subscriber's house, the OLT 20 installed in the center station, and the plurality of GE-PONs. A coupler 30 for branching a line for a subscriber is shown by an optical line 35 that is capable of optical communication defined by IEEE 802.3ah. The ONU 10 can be connected to a communication terminal 40 such as a personal computer.

  In the optical line 35 connected to the OLT 20 and the ONU 10, the communication sent from the OLT 20 to the ONU that is transmitted to all ONUs connected to the optical line 35 under the control of the OLT 20 is transmitted in the downstream direction, and the OLT 20 is dynamically Communication sent from the ONU having the characteristic of allocating the bandwidth to the OLT 20 is assumed to be uplink communication. The communication here is identified by “destination IP address” and “source IP address”, and data frames having the same “destination IP address” and “source IP address” are the same communication. To do.

  Here, the ONU 10 can connect the optical line 35 and a communication terminal 40 such as a personal computer. The ONU 10 includes a control unit 101, an optical connection unit 102, a LAN connection unit 103, a transmission priority determination unit 104, a communication determination unit 105, a low priority queue 106, a high priority queue 107, A transmission allocation control unit 108, a transmission buffer 109, a transmission unit 110, a transmission data table 111, a reception unit 112, a reception analysis unit 113, a reception control unit 114, a timer 116, and a timer setting unit 117 are provided. Yes. That is, the ONU 10 uses the timer 116 and the timer setting unit 117 instead of the guarantee condition setting unit 115 of FIG. Note that the guarantee condition setting unit 115 may include a timer 116 and a timer setting unit 117.

  The control unit 101 supervises the operation of the ONU 10. The optical connection unit 102 is an interface for connecting the optical line 35. The LAN connection unit 103 is an interface capable of connecting the communication terminal 40 via a LAN. The transmission priority determination unit 104 determines a data frame that has entered from the communication terminal 40 via the LAN connection unit 103 as communication with high priority and communication with low priority according to a certain rule. The communication determination unit 105 extracts “destination IP address” and “source IP address” in the low priority data frame. The low priority queue 106 stores data frames determined as low priority by the transmission priority determination unit 104 until transmission. The high priority queue 107 stores data frames determined to have a high priority by the transmission priority determination unit 104 until transmission. The transmission allocation control unit 108 acquires a data frame to be actually transmitted from the low priority queue 106 or the high priority queue 107 according to the uplink band dynamically allocated by DBA (Dynamic Bandwidth Allocation) of GE-PON, Store in the transmission buffer 109. The transmission buffer 109 stores a data frame in which a bandwidth is dynamically allocated and transmission is already determined. The transmission unit 110 transmits the data frame stored in the transmission buffer 109 via the optical connection unit 102. The transmission data table 111 stores information for identifying the communication extracted by the communication determination unit 105. The receiving unit 112 receives downlink data from the optical line 35 via the optical connection unit 102. The reception analysis unit 113 extracts the bandwidth allocation in the uplink direction from the data frame received by the reception unit 112. The reception control unit 114 processes other received data. The timer 116 is a clock or a timer function for counting a time when low priority communication is not transmitted. The timer setting unit 117 sets a maximum time interval guaranteed for low priority communication.

FIG. 4 shows a flowchart as an outline of the operation of the present embodiment.
In the present embodiment, an operation will be described in which ONU 10 transmitted from communication terminal 40 reliably transmits a communication set at a low priority at regular time intervals.

  It is assumed that the set value “5 seconds” of the maximum transmission interval guaranteed for each communication is entered in the timer setting unit 117. This means that for every communication (data frame having the same destination IP address and source IP address), a data frame is sent to the OLT 20 once every 5 seconds. In addition, communication with the destination IP address “12.34.56.78” and the source IP address “11.22.33.44” is defined as a low priority in the priority determination condition in the ONU 10. And

  The communication of the destination IP address “12.34.56.78” and the transmission source IP address “11.22.33.44” will be described as “communication A” as identification for easy explanation.

(1) Step S201
The communication terminal 40 transmits a data frame for communication A.
(2) Step S202
When the communication A data frame is transmitted from the communication terminal 40, the ONU 10 receives the data frame by the LAN connection unit 103 and sends the data frame to the transmission priority determination unit 104. The transmission priority determination unit 104 determines the priority of communication A.
(3) Step S203
If the communication determined by the transmission priority determination unit 104 is a communication designated as a high priority, it is sent to the high priority queue 107 and transmitted preferentially by the DBA.
(4) Step S204
In the transmission priority determination unit 104, since the communication A is defined as a low priority as described in the preconditions in the ONU 10, a destination IP address “12” of the data frame is used for the communication determination unit 5 to determine communication. .34.56.78 ”and the source IP address“ 11.22.33.44 ”are extracted, and information is registered in the communication data table 13 via the control unit 101.
(5) Step S205
The data frame is sent to the low priority queue 106.
(6) Step S206
When the control unit 101 of the ONU 10 detects the transmittable bandwidth dynamically allocated by the DBA from the OLT 20 by the reception analysis unit 113, the transmission allocation control unit 108 determines the DBA from the low priority queue 106 and the high priority queue 107. The data frame is written into the transmission buffer 109 under the conditions as described above.
(7) Step S207
Here, the control unit 101 of the ONU 10 refers to the transmission data table 111 and confirms the communication that has passed the time set in the timer setting unit 117 based on the elapsed time.
(8) Step S208
The transmission control unit 101 puts the data frame in the transmission buffer 109 by the transmission allocation control unit 108 so that the data frame of the communication A can be transmitted at the head of the transmission permitted band. That is, this data frame is inserted at the head of the transmission order of the data frame stored in the transmission buffer 109.
(9) Step S209
The transmission unit 110 transmits the data frame stored in the transmission buffer 109 to the OLT 20.

FIG. 5 shows the state of the communication data table 13 in this operation description.
It is assumed that information other than the data frame of communication A has already been registered. Each item of FIG. 5 (1) shows the following. “Term” is the order in which data frames in the low priority queue 106 are to be transmitted. “Communication” is an identification for ease of explanation, and communication having a destination IP address and a transmission source IP address different from communication A are referred to as “communication B” and “communication C”. The “elapsed time” is an elapsed time since the communication was transmitted last time, and is displayed by measuring and storing the time from the previous transmission by the timer 11 as shown in FIG.

  The control unit 101 of the ONU 10 requests the OLT 20 by the DBA for a bandwidth capable of transmitting all of the items 1 to 5 in FIG. 5 (1) entered in the low priority queue 106 together with the bandwidth entered in the high priority queue 107, and the OLT 20 It is assumed that the bandwidths from 1 to 3 are allowed for the bandwidth that has entered the high priority queue 107 and the low priority queue 106 for the ONU 10. In this band allocation, the data frames of items 4 and 5 stored in the low priority queue 106 are not transmitted. Here, the control unit 101 of the ONU 10 refers to the transmission data table 111 and confirms communication that has passed “5 seconds” set in the timer setting unit 117 based on elapsed time. In the state shown in FIG. 5, communication A has passed 5 seconds, and other communication has not passed 5 seconds.

  Since communication A exceeds “5 seconds” in the registered information of FIG. 5, the control unit 101 transmits the data frame of communication A registered in item 5 to the dynamically allocated band this time. The transmission allocation control unit 108 puts data in the transmission buffer 109 so that transmission can be performed.

  FIG. 6 shows data rearrangement in the transmission allocation control unit 108. Items 1 to 5 are the numbers of the items “item” in FIG. 5A of the transmission data table 111. Communications A to C are also values corresponding to the item “communication identification” in FIG.

  FIG. 6 shows that “term 5, communication A” that exceeds the prescribed time “5 seconds” in this bandwidth allocation is inserted before “term 1, communication C”, and “term 3, communication B” is the current transmission bandwidth. By not performing transmission by allocation, the transmission interval of communication A is guaranteed during band allocation.

  The data stored in the transmission buffer 109 is transmitted from the transmission unit 110 at the time allocated by the DBA. Further, the elapsed time of the transmission data table 111 (FIG. 5) is reset to “0” for the transmitted communication.

  As another embodiment of the present invention, the basic configuration is the same as that of the second embodiment, but the same effect can be obtained by changing the configuration and operation as described below.

A third embodiment of the present invention will be described.
In the second embodiment, “elapsed time since the communication is performed” is used as a condition for bandwidth guarantee. However, by collecting information on the frame length of the data frame transmitted in each communication and the transmission time, The bandwidth may be guaranteed based on the “transmission speed for transmission”. Collection of data frame length and transmission time information is performed by the control unit 101, the transmission allocation control unit 108, or the transmission unit 110.

A fourth embodiment of the present invention will be described.
In the second embodiment, the guaranteed communication is identified by the “combination of destination IP address and source IP address”. However, destination IP address / source IP address / destination MAC address / source MAC address / user-specific You may identify by the combination of the information contained in a flame | frame, such as a setting, or single use. The communication determination unit 105 extracts these pieces of information.

A fifth embodiment of the present invention will be described.
In the second embodiment, the guaranteed data frame of the communication is inserted at the head of the transmission band. However, the data may be inserted into the transmission band as follows.
(1) Insert before the last or halfway frame.
The control unit 101 uses the transmission allocation control unit 108 to insert a guaranteed communication data frame, for example, one frame before the last frame in the transmission order or one frame before the middle. That is, the data frame is inserted so that the transmission order is last or halfway.
(2) Instead of being inserted, it is replaced with a communication frame for which the guarantee time has not elapsed.
The control unit 101 uses the transmission allocation control unit 108 to delete a communication frame for which the guarantee time has not elapsed, and insert a guaranteed communication data frame instead. In other words, a communication frame for which the guaranteed time has not elapsed is overwritten with a guaranteed communication data frame.

A sixth embodiment of the present invention will be described.
In the second embodiment, the data construction change for the band to be transmitted is performed when the data is moved to the transmission buffer. However, the data may be rearranged after being stored in the transmission buffer.

  As described above, the present invention guarantees a transmission interval for communication in which transmission priority is set low in a terminal ONU connected to a GE-PON to which a transmission band is dynamically allocated, It is characterized in that low priority communication can be continued regardless of the ONU communication state.

  DBA, which is a bandwidth allocation method, is not standardized and there are various types. However, since the bandwidth guarantee method of the present invention is a control for a state where allocation by DBA has been completed, it is an existing bandwidth allocation method. Do not depend.

FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the first embodiment of the present invention. FIG. 3 is a block diagram showing the configuration of the second embodiment of the present invention. FIG. 4 is a flowchart showing the operation of the second embodiment of the present invention. FIG. 5 is a diagram illustrating a state of the transmission data table. FIG. 6 is a diagram illustrating data rearrangement in the transmission allocation control unit.

Explanation of symbols

10 ... ONU (Optical Network Unit)
DESCRIPTION OF SYMBOLS 101 ... Control part 102 ... Optical connection part 103 ... LAN connection part 104 ... Transmission priority determination part 105 ... Communication determination part 106 ... Low priority queue 107 ... High priority queue 108 ... Transmission allocation control part 109 ... Transmission buffer 110 ... Transmission unit 111 ... Transmission data table 112 ... Reception unit 113 ... Reception analysis unit 114 ... Reception control unit 115 ... Warranty condition setting unit 116 ... Timer 117 ... Timer setting unit 20 ... OLT (Optical Line Terminal)
30 ... coupler
35 ... Optical line 40 ... Communication terminal

Claims (15)

  A GE-PON (Gigabit Ethernet (registered trademark) -Passive Optical Network) station-side device OLT (Optical Line Terminal) placed in a telephone exchange station is connected via an optical line and a communication terminal can be connected. An optical communication network connection device corresponding to an ONU (Optical Network Unit) which is a PON terminal terminal,
  A receiving unit for receiving downlink data from the OLT;
  A reception analysis unit for detecting a transmittable band dynamically allocated by DBA (Dynamic Bandwidth Allocation) from the OLT in the uplink direction from the downlink data;
  A transmission priority determination unit that determines whether or not a transmission priority setting is low for a data frame to be transmitted when communication from the communication terminal to the OLT is performed;
  A low priority queue for storing data frames determined to have a low transmission priority setting;
  A high priority queue for storing data frames determined to have a high transmission priority setting;
  A guarantee condition setting unit for registering a transmission guarantee condition for communication from the communication terminal to the OLT;
  The data frames stored in the low priority queue and the high priority queue are extracted, the data frames stored in the high priority queue are written to the transmission buffer, and the data stored in the low priority queue is stored. A transmission allocation control unit that writes the frame corresponding to the transmission guarantee condition in the transmission buffer so as to be in a predetermined transmission order;
  A transmission unit for transmitting the data frame stored in the transmission buffer to the OLT;
With
  Optical communication network connection device.   The optical communication network connection device according to claim 1,
  A communication determination unit that extracts communication identification information that enables determination of the same communication in communication data from a data frame determined to have a low setting of the transmission priority;
  A transmission data table storing the communication identification information and evaluation items related to the data frame in the transmission order for the data frames stored in the low priority queue;
Further comprising
  The transmission allocation control unit
  Means for referring to the transmission data table and determining whether there is a data frame in which the evaluation item satisfies the transmission guarantee condition among the data frames stored in the low priority queue;
  Means for interrupting a data frame corresponding to the transmission guarantee condition into a group of data frames scheduled to be transmitted stored in the transmission buffer when there is a data frame corresponding to the transmission guarantee condition;
With
  Optical communication network connection device.   The optical communication network connection device according to claim 2,
  The warranty condition setting unit
  A timer that counts a time during which a data frame determined to have a low transmission priority setting is not transmitted;
  As the transmission guarantee condition, a timer setting unit that sets a predetermined time interval for guaranteeing a data frame that is determined to have a low transmission priority setting;
Further comprising
  The transmission allocation control unit
  Among the data frames stored in the low priority queue, a data frame whose non-transmitted time exceeds the predetermined time interval is determined in the transmission order of the data frame scheduled to be transmitted stored in the transmission buffer. Means to insert into position
Further comprising
  Optical communication network connection device.   The optical communication network connection device according to claim 2,
  The warranty condition setting unit
  A timer that counts a time during which a data frame determined to have a low transmission priority setting is not transmitted;
  As the transmission guarantee condition, a timer setting unit that sets a predetermined time interval for guaranteeing a data frame that is determined to have a low transmission priority setting;
Further comprising
  The transmission allocation control unit
  Of the data frames stored in the transmission buffer, the data frames stored in the low-priority queue instead of the data frames whose transmission time does not exceed the predetermined time interval. Means for overwriting a data frame whose non-transmitted time exceeds the predetermined time interval
Further comprising
  Optical communication network connection device.   An optical communication network connection device according to any one of claims 1 to 4,
  The transmission allocation control unit
  Means for changing the transmission order of the data frames stored in the transmission buffer after storing the data frames stored in the low priority queue and the high priority queue in the transmission buffer;
Further comprising
  Optical communication network connection device.   A GE-PON (Gigabit Ethernet (registered trademark) -Passive Optical Network) station-side device OLT (Optical Line Terminal) placed in a telephone exchange station is connected via an optical line and a communication terminal can be connected. A bandwidth guarantee method implemented by an optical communication network connection device corresponding to an ONU (Optical Network Unit) which is a PON terminal terminal,
  Receiving downstream data from the OLT;
  Detecting a transmittable bandwidth dynamically allocated by DBA (Dynamic Bandwidth Allocation) from the OLT in the downlink direction from the downlink data;
  When communication from the communication terminal to the OLT is performed, determining whether a transmission priority setting is low for a data frame to be transmitted;
  Storing a data frame determined to have a low transmission priority setting in a low priority queue;
  Storing a data frame determined to have a high transmission priority setting in a high priority queue;
  Registering transmission guarantee conditions for communication from the communication terminal to the OLT;
  The data frames stored in the low priority queue and the high priority queue are extracted, the data frames stored in the high priority queue are written to the transmission buffer, and the data stored in the low priority queue is stored. Writing a frame corresponding to the transmission guarantee condition in the transmission buffer so as to be in a predetermined transmission order;
  Transmitting the data frame stored in the transmission buffer to the OLT;
including
  Bandwidth guarantee method.   The bandwidth guarantee method according to claim 6, wherein
  Extracting communication identification information that makes it possible to determine that communication data is the same communication from a data frame determined to have a low transmission priority setting;
  For the data frames stored in the low priority queue, storing the communication identification information and evaluation items related to the data frame in the transmission order in a transmission data table;
  Referring to the transmission data table, determining whether there is a data frame in which the evaluation item satisfies the transmission guarantee condition among the data frames stored in the low priority queue;
  If there is a data frame corresponding to the transmission guarantee condition, causing the data frame corresponding to the transmission guarantee condition to be interrupted in a data frame group scheduled to be transmitted stored in the transmission buffer;
Further includes
  Bandwidth guarantee method.   The bandwidth guarantee method according to claim 7,
  Counting a time during which a data frame determined to have a low transmission priority setting is not transmitted;
  As the transmission guarantee condition, setting a predetermined time interval for guaranteeing a data frame determined to have a low transmission priority setting;
  Among the data frames stored in the low priority queue, a data frame whose non-transmitted time exceeds the predetermined time interval is determined in the transmission order of the data frame scheduled to be transmitted stored in the transmission buffer. Inserting into position
Further includes
  Bandwidth guarantee method.   The bandwidth guarantee method according to claim 7,
  Counting a time during which a data frame determined to have a low transmission priority setting is not transmitted;
  As the transmission guarantee condition, setting a predetermined time interval for guaranteeing a data frame determined to have a low transmission priority setting;
  Of the data frames stored in the transmission buffer, the data frames stored in the low-priority queue instead of the data frames whose transmission time does not exceed the predetermined time interval. Overwriting a data frame whose non-transmitted time exceeds the predetermined time interval
Further includes
  Bandwidth guarantee method.   The bandwidth guarantee method according to any one of claims 6 to 9,
  After the data frames stored in the low priority queue and the high priority queue are stored in the transmission buffer, the transmission order of the data frames stored in the transmission buffer is changed.
Further includes
  Bandwidth guarantee method.   A GE-PON (Gigabit Ethernet (registered trademark) -Passive Optical Network) station-side device OLT (Optical Line Terminal) placed in a telephone exchange station is connected via an optical line and a communication terminal can be connected. A program executed by an optical communication network connection device corresponding to an ONU (Optical Network Unit) which is a PON terminal terminal,
  Receiving downlink data from the OLT;
  Detecting a transmittable bandwidth dynamically allocated by DBA (Dynamic Bandwidth Allocation) from the OLT in the uplink direction from the downlink data;
  When communication from the communication terminal to the OLT is performed, determining whether a transmission priority setting is low for a data frame to be transmitted;
  Storing a data frame determined to have a low transmission priority setting in a low priority queue;
  Storing a data frame determined to have a high transmission priority setting in a high priority queue;
  Registering a transmission guarantee condition for communication from the communication terminal to the OLT;
  The data frames stored in the low priority queue and the high priority queue are extracted, the data frames stored in the high priority queue are written to the transmission buffer, and the data stored in the low priority queue is stored. Writing the frame corresponding to the transmission guarantee condition in the transmission buffer so as to be in a predetermined transmission order;
  Transmitting the data frame stored in the transmission buffer to the OLT;
For executing an optical communication network connection device
  program.   The program according to claim 11,
  Extracting communication identification information that makes it possible to determine a step that is the same communication in communication data from a data frame determined to have a low transmission priority setting;
  For the data frames stored in the low priority queue, storing the communication identification information and evaluation items related to the data frame in a transmission order in a transmission order;
  Referring to the transmission data table and determining whether there is a data frame in which the evaluation item satisfies the transmission guarantee condition among the data frames stored in the low priority queue;
  If there is a data frame corresponding to the transmission guarantee condition, interrupting the data frame corresponding to the transmission guarantee condition into a data frame group scheduled to be transmitted stored in the transmission buffer;
For further execution by the optical network connection device
  program.   A program according to claim 12,
  Counting a time during which a data frame determined to have a low transmission priority setting is not transmitted;
  As the transmission guarantee condition, setting a predetermined time interval for guaranteeing data frames determined to have a low transmission priority setting;
  Among the data frames stored in the low priority queue, a data frame whose non-transmitted time exceeds the predetermined time interval is determined in the transmission order of the data frame scheduled to be transmitted stored in the transmission buffer. Step to insert into position
For further execution by the optical network connection device
  program.   A program according to claim 12,
  Counting a time during which a data frame determined to have a low transmission priority setting is not transmitted;
  As the transmission guarantee condition, setting a predetermined time interval for guaranteeing data frames determined to have a low transmission priority setting;
  Of the data frames stored in the transmission buffer, the data frames stored in the low-priority queue instead of the data frames whose transmission time does not exceed the predetermined time interval. And overwriting a data frame whose non-transmitted time exceeds the predetermined time interval
For further execution by the optical network connection device
  program.   The program according to any one of claims 11 to 14,
  A step of changing a transmission order of the data frames stored in the transmission buffer after storing the data frames stored in the low priority queue and the high priority queue in the transmission buffer;
For further execution by the optical network connection device
  program.

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