JP6129429B1 - Packet communication system, subscriber unit, station side device, and packet communication method - Google Patents

Abstract

In a packet communication system in which a plurality of subscriber devices and station side devices communicate with each other, each of the plurality of subscriber devices deletes duplicate header information from communication packets having the same header information with respect to a plurality of input communication packets. And having an aggregate packet generator that concatenates a plurality of data, generates an aggregate packet to which concatenation information is added, and transmits the aggregate packet to the station side device. When the station side device receives the aggregate packet, It has a decomposed packet generator that decomposes a plurality of included data based on concatenation information and reconstructs a plurality of communication packets.

Description

  The present invention relates to a point-to-multipoint communication system in which a plurality of subscriber devices share a transmission path and communicate with a station side device in a time division manner.

  With the spread of FTTH (Fiber To The Home) and recent smartphones, there has been a demand for higher capacity and more economical optical networks that accommodate rapidly increasing data traffic.

  Currently, 1G-EPON (1 Gigabit-Ethernet (registered trademark) PON (Passive Optical Network)) of IEEE (Institut of Electrical and Electronic Engineers) standard is widespread.

  In the currently popular PON system, a plurality of subscriber devices ONU (Optical Network Unit) are connected to a station side device OLT (Optical Line Terminal) by a time division multiplexing method, and some transmission lines are Shared by ONUs. Each ONU avoids collision of transmission data between ONUs by transmitting data only during the time permitted from the OLT.

  The ONU is installed in a user home, office, mobile base station, or the like. In general, a variable-length Ethernet (registered trademark) signal is input / output from a user terminal. The OLT notifies the ONU of the transmission permission time based on the Ethernet packet accumulation amount requested from the ONU. Then, the ONU sequentially outputs the Ethernet packets waiting for transmission held by itself within the time during which transmission is permitted.

  The OLT cannot consider the length of each variable-length Ethernet packet waiting for transmission at the ONU. For this reason, there is a case where the transmission possible time (GRANT length) assigned to the ONU by the OLT does not necessarily match the total of the Ethernet packet lengths that can be transmitted.

  Accordingly, when the transmission permission time from the OLT is equal to or shorter than the ONU request time, there is a situation in which there is no Ethernet packet that matches the length, although the transmission time remains. In such a situation, the ONU cannot use all of the allocated transmission time, and the allocated time is wasted, and an ideal Ethernet packet transmission rate may not be obtained.

  On the other hand, a method of dividing and transmitting an Ethernet packet in accordance with the remaining transmittable time and using up all the allocated time is disclosed as a conventional technique (see, for example, Patent Document 1).

Japanese Patent No. 4169595

However, the prior art has the following problems.
The conventional technology can improve the use efficiency in the surplus area at the end of the GRANT length. Therefore, such a conventional technique is effective in the PON system in which the OLT assigns based on the Ethernet packet accumulation amount from the ONU.

  However, it is not always effective for a PON system in which the OLT assigns a GRANT length to an ONU based on a transmission request between applications using the PON as a communication transmission path, not the request amount from the ONU. is not. In such a PON system, it is impossible to determine by the OLT what packet length and number of packets are used when packetizing an Ethernet packet to transmit communication data required by an application to the ONU.

  For this reason, the overhead length given for each Ethernet packet cannot be added to the GRANT length from the OLT to the ONU. As a result, there are cases where sufficient allocation cannot be obtained at the timing when the application actually wants to transmit. That is, the conventional technique has a problem that a sufficient transmission rate cannot be obtained.

  In the prior art, the OLT adds a margin for the Ethernet header when calculating the GRANT length. As a result, there is also a problem that the use efficiency of the PON section that performs communication by time division multiplexing is lowered.

  Further, when the Ethernet packet is divided and transmitted in the prior art, it is necessary to insert a special code indicating division in addition to the code indicating the beginning and end of the packet defined in the IEEE 802.3 standard. As a result, there is also a problem that it cannot be realized by a function only based on IEEE.

  The present invention has been made to solve such a problem. Even when the amount of allocation from the OLT is not sufficient, data transmission from the ONU can be performed without delay, and transmission speed is improved and transmission is performed. It is an object of the present invention to provide a packet communication system, a subscriber unit, a station side device, and a packet communication method that can realize delay reduction.

A packet communication system according to the present invention is a packet communication system in which a plurality of subscriber devices share a transmission path and communicate with a station side device in a time division multiplexing manner. Each of the plurality of subscriber devices is input. Concerning a plurality of communication packets, the duplicate header information is deleted from the communication packets having the same header information, the plurality of data existing in each communication packet after the header information is deleted, and the link information is added. An aggregate packet generator that generates a packet and transmits the generated aggregate packet as a regular communication packet to the station side device, and the station side device includes a plurality of packets included in the aggregate packet when the aggregate packet is received. A packet generator that decomposes the data based on the concatenation information and reconstructs a plurality of communication packets. A header check unit that checks a header including destination information of a plurality of communication packets, discriminates packets having the same header information, a header deletion unit that deletes a header of the plurality of communication packets, and a plurality of subscriber devices A maximum packet length determination unit that determines the maximum packet length of one packet to be transmitted by communicating with the station side device, the same packet information within a range that can be stored in the maximum packet length, and A packing unit that continuously concatenates or divides a plurality of data from which headers have been deleted, and generates concatenated data having one continuous data configuration accommodated in one packet having the maximum packet length; The same header as the concatenation information adding unit that generates the concatenation information of the concatenation data as the concatenation information, and assigns the concatenation information to the concatenation data. Grant one header information corresponding to the broadcast in connection data, see contains a header imparting section for one packet with the configuration of the normal communication packet, aggregation packet generator is determined by the maximum packet length determining unit A packing unit that further includes a packet number calculation unit that calculates the number of packets of the maximum packet length that can be continuously transmitted in one transmission opportunity based on the maximum packet length and the transmission available time allocated from the station side device. Generates the concatenated data based on the number of packets and the maximum packet length, and the station side device is a maximum packet length determiner that determines the maximum packet length by communicating with the subscriber unit, and a host device A reception information extractor that receives information on the amount of data scheduled to arrive at the radio master station from the radio master station, and a data amount scheduled to arrive at the radio master station is transmitted from the subscriber unit with the maximum packet length And a bandwidth calculator for determining the transmittable time and transmitting the determined transmittable time to the subscriber apparatus .

Further, the subscriber device according to the present invention is a subscriber device applied to a packet communication system in which a plurality of subscriber devices share a transmission path and communicate with a station side device in a time division multiplexing manner, A header check unit that checks a header including destination information of a plurality of input communication packets, discriminates packets having the same header information, a header deletion unit that deletes headers of a plurality of communication packets, and a plurality of subscribers continuous and maximum packet length determination unit, to the extent that can be stored in a maximum packet length have the same header information, and a plurality of data to which the header is removed, each of the devices to determine the maximum packet length of a communication packet to be transmitted a packing unit that is joined to generate concatenated data having one continuous data configured to be housed in a single packet having the maximum packet length, connection Information about connection points of over data as connection information, and connection information adding unit that applies to the connection data, the one of the header information corresponding to the same header information assigned to the connection data, the structure of the normal communication packet one packet An aggregation packet generator configured to include a header adding unit that generates an aggregated packet, and a transmission / reception control unit that makes a bandwidth request to the station side device according to the accumulated amount of the aggregated packet Is.

Further, the station side device according to the present invention is a station side device applied to a packet communication system in which a plurality of subscriber devices share a transmission path, and communicate with the station side device in a time division multiplexing manner, The same for the plurality of communication packets input to each of the plurality of subscriber devices and the maximum packet length determination unit that determines the maximum packet length of the section that shares the transmission path by communicating with each of the plurality of subscriber devices. One continuous data structure is obtained by deleting overlapping header information from a communication packet having header information and continuously connecting a plurality of data existing in each communication packet after the deletion of the overlapping header information. Concatenated data is generated, and an aggregate packet to which concatenated information corresponding to information related to the concatenated portion of the concatenated data is attached is received from each of the plurality of subscriber devices. A receiver that, when receiving the aggregated packet, a connection data contained in the aggregated packet is decomposed on the basis of the connection information, and degradation packet generator to reconstruct a plurality of communication packets, the radio is higher-level device Assuming that the reception information extractor that receives information on the amount of data scheduled to arrive at the wireless master station from the master station and that the amount of data scheduled to arrive at the wireless master station is transmitted from the subscriber unit with the maximum packet length. And a bandwidth calculator for determining the transmittable time and transmitting the determined transmittable time to the subscriber apparatus .

Furthermore, the packet communication method according to the present invention is a packet communication method in which a plurality of subscriber devices share a transmission path and communicate with a station side device in a time division multiplexing method. In each of the plurality of subscriber devices, A first step of checking a header including destination information of a plurality of input communication packets and determining a packet having the preceding header information; a second step of deleting a header of the plurality of communication packets; and a plurality of subscriptions The third step of determining the maximum packet length of one packet transmitted by each user device by communicating with the station side device, and having the same header information within the range that can be stored in the maximum packet length, and the header is deleted A continuous data structure in which a plurality of pieces of data are continuously concatenated or divided and accommodated in one packet having the maximum packet length 4th step which produces | generates the connection data which it has, 5th step which produces | generates the information regarding the connection location of connection data as connection information, and gives connection information to connection data, and one header information equivalent to the same header information are connected A sixth step of adding to the data, generating an aggregate packet as a regular communication packet configuration, and transmitting the aggregate packet to the station side device, and the aggregate packet transmitted from each of the plurality of subscriber devices in the station side device a seventh step of receiving, when receiving the aggregated packet, and decompose on the basis a plurality of data contained in the aggregated packet to the connection information, have a eighth step of reconstructing a plurality of communication packets In each of the plurality of subscriber devices, based on the maximum packet length determined in the third step and the transmittable time allocated from the station side device The method further includes a ninth step of calculating the number of packets having a maximum packet length that can be continuously transmitted in one transmission opportunity, and the fourth step generates concatenated data based on the number of packets and the maximum packet length. The station side device communicates with the subscriber device to receive the information relating to the data amount scheduled to arrive at the wireless master station from the tenth step of determining the maximum packet length and from the wireless master station as the host device. 11th step, assuming that the amount of data scheduled to arrive at the wireless master station is transmitted from the subscriber apparatus with the maximum packet length, determine the transmittable time, and transmit the determined transmittable time to the subscriber apparatus And a twelfth step .

  According to the present invention, it is possible to reduce a header and an inter-packet gap, transmit a packet in which a plurality of data is concatenated from an ONU to an LTOOL, and reconstruct a normal packet in the LTOOL. As a result, even when the allocation amount from the OLT is not sufficient, data transmission from the ONU can be performed without delay, and a packet communication system, a subscriber unit, which can realize transmission speed improvement and transmission delay reduction, A station side device and a packet communication method can be obtained.

It is a figure which shows the structure of the packet communication system in Embodiment 1 of this invention. It is the figure which showed the hardware constitutions of the packet communication system which concerns on Embodiment 1 of this invention. It is the figure which showed the functional block structure of ONU which concerns on Embodiment 1 of this invention. It is the figure which showed the functional block structure of OLT which concerns on Embodiment 1 of this invention. It is the figure which showed the variable length Ethernet packet prescribed | regulated by IEEE802.3 used with the packet communication system which concerns on Embodiment 1 of this invention. It is the figure which showed one Ethernet packet output to the PON transmission / reception control part from the header provision part in ONU which concerns on Embodiment 1 of this invention. It is a functional block configuration of the OLT according to the second embodiment of the present invention.

  Hereinafter, preferred embodiments of a packet communication system, a subscriber unit, a station side device, and a packet communication method of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a packet communication system according to Embodiment 1 of the present invention. The OLT 1 and the ONUs 2 and 3 are connected via the optical coupler 4 and the optical fiber 5. As a result, the wireless slave stations 6 and 7 that accommodate the plurality of terminals 15 and 16 and the wireless master stations 8 and 9 are connected. Here, the wireless slave station 6 communicates only with the wireless master station 8, and the wireless slave station 7 communicates only with the wireless master station 9.

  The terminal 16 transmits the stored data 18 waiting for transmission to the wireless slave station 7 with the transmission permission from the wireless master station 9. The wireless slave station 7 transmits the data 18 received from the terminal 16 to the ONU 3 as a packet 14 stored in a variable-length Ethernet packet. Similarly, data 17 from the terminal 15 is transmitted from the wireless slave station 6 to the ONU 2.

  Transmission data from the ONUs 2 and 3 to the OLT 1 is controlled in transmission timing from the ONUs 2 and 3 by a time division multiplexing method in order to avoid collisions in the optical coupler 4.

  FIG. 2 is a diagram showing a hardware configuration of the packet communication system according to Embodiment 1 of the present invention. The ONU 100 includes a PON optical transceiver 400, a PON access control processor 401, an Ethernet processing processor 402, an Ethernet interface 403, and a packet memory 404.

  The OLT 200 includes a PON optical transceiver 410, a PON access control processor 411, an Ethernet processing processor 412, an Ethernet interface 413, and a packet memory 414.

  In the first embodiment, the PON optical transceiver 400 and the PON access control processor 401 Ethernet processing processor 402 in the ONU 100 and the PON optical transceiver 410 and the PON access control processor 411 Ethernet processing processor 402 in the OLT 200 are technically combined. These functions will be described below in detail with reference to FIGS.

  FIG. 3 is a diagram showing a functional block configuration of the ONU according to Embodiment 1 of the present invention. In the ONU 100 shown in FIG. 3, the configuration other than the PON transmission / reception control unit 111 corresponds to an aggregate packet generator.

  The wireless slave station 105 and the ONU 100 are connected. The header check unit 103 in the ONU 100 has a function of checking a header such as a destination, a transmission source, and a type of an Ethernet packet input from the wireless slave station 105. The header deletion unit 102 has a function of deleting an Ethernet header that can be deleted.

  The maximum packet length determination unit 106 has a function of determining the maximum Ethernet packet length for transmitting the PON section. The output packet number calculation unit 107 has a function of determining the number of packets to be output at one transmission opportunity of the ONU. The packing unit 101 has a function of concatenating and dividing packets read from the buffer unit.

  The concatenation information adding unit 109 has a function of adding information related to concatenation / division of data stored in the Ethernet packet. The header assigning unit 108 has a function of assigning a new Ethernet header. The PON transmission / reception control unit 111 has a function of performing PON transmission / reception control defined in IEEE 802.3 with the OLT.

  The functions of the PON transmission / reception control unit 111 in the ONU 100 shown in FIG. 3 are realized by the PON optical transceiver 400 and the PON access control processor 401 shown in FIG.

  FIG. 4 is a diagram showing a functional block configuration of the OLT according to the first embodiment of the present invention. In the OLT 200 shown in FIG. 4, the packet reconfiguration unit 204 corresponds to a disassembled packet generator.

  The OLT 200 and the wireless master stations 202 and 206 are connected to each other. The PON transmission / reception control unit 201 has a function of performing transmission / reception control of the PON defined by IEEE 802.3 with the ONU.

  The switch units 203 and 205 have a function of transmitting and receiving Ethernet packets to and from the wireless master stations 202 and 206. The packet reconstruction unit 204 has a function of reconstructing an Ethernet packet by adding an Ethernet header to each of the concatenated / divided Ethernet packets.

  The functions of the PON transmission / reception control unit 201 in the OLT 200 shown in FIG. 4 are realized by the PON optical transceiver 410 and the PON access control processor 411 shown in FIG.

  Next, the operation will be described. When there is a transmission request from the terminal via the wireless slave station 105, the wireless master station 202 or the wireless master station 206 gives a transmission permission to the terminal. When the wireless slave station 105 receives data from the terminal, the wireless slave station 105 converts the data into one or more Ethernet packets having a variable length defined by IEEE 802.3, and transmits the packet to the ONU 100.

  FIG. 5 is a diagram showing a variable-length Ethernet packet defined in IEEE 802.3, which is used in the packet communication system according to Embodiment 1 of the present invention. FIG. 5 corresponds to an input packet configuration to the subscriber unit ONU. FIG. 5 shows an Ethernet packet in which two data, data 1 and data 2, are embedded.

  The header check unit 103 of the ONU 100 checks the destination, transmission source, type, and VLAN tag, which are Ethernet headers, for each Ethernet packet. Further, the header check unit 103 outputs the Ethernet header and the packet data length to the output packet number calculation unit 107.

  The header deletion unit 102 once deletes all the Ethernet headers and stores them in the packing unit 101 as data.

  When the output packet number calculation unit 107 receives the GRANT length allocated from the OLT from the PON transmission / reception control unit 111, the output packet number calculation unit 107 determines the maximum Ethernet packet length determined by the maximum packet length determination unit 106 within the time of one GRANT length. Whether it can be included is calculated as the number of output packets. Then, the output packet number calculation unit 107 instructs the packing unit 101 to perform a connection process described later until the GRANT length end timing.

  When a plurality of Ethernet packets having the maximum Ethernet packet length are accommodated in accordance with the GRANT length, a surplus may occur at the end of the GRANT length. In that case, the output packet number calculation unit 107 instructs the packing unit 101 to output the last Ethernet packet accommodated so that the Ethernet packet length is within the GRANT length.

  The packing unit 101 concatenates data having the same header information in the header check unit 103. If the data length is too long to be accommodated in one Ethernet packet, the packing unit 101 divides the data and accommodates it in two or more Ethernet packets. As described above, information when one piece of data is divided into two or more Ethernet packets is also included in the connection information.

  The link information adding unit 109 adds link information to the end of the packed data. Further, the header assigning unit 108 assigns the corresponding Ethernet header and outputs it to the PON transmission / reception control unit 111 as one Ethernet packet.

  FIG. 6 is a diagram showing one Ethernet packet output from the header assignment unit 108 in the ONU 100 according to Embodiment 1 of the present invention to the PON transmission / reception control unit 111. FIG. 6 corresponds to the transmission packet configuration of the subscriber unit ONU. The Ethernet packet shown in FIG. 6 has a format defined by IEEE 802.3, and does not require a special function and can be transmitted to the OLT.

  As is clear from the comparison between the configuration of FIG. 5 and the configuration of FIG. 6, the ONU 100 according to the first embodiment deletes duplicate Ethernet headers and continuously incorporates a plurality of data in accordance with the maximum packet length. In this way, the aggregated Ethernet packet can be reconstructed and transmitted together with the connection information. Further, the Ethernet packets subjected to such aggregation processing can be continuously transmitted in a number that can be accommodated in the GRANT length.

  On the other hand, the PON transmission / reception control unit 201 of the OLT 200 outputs the Ethernet packet received from the ONU 100 to the packet reconstruction unit 204. The packet reconstruction unit 204 decomposes the data based on the concatenation information at the end of the Ethernet packet, and assigns the same Ethernet header to each. Further, the switch unit 205 outputs the regular Ethernet packet after the Ethernet header is added to the wireless master station corresponding to the wireless slave station that is the transmission source of the Ethernet packet.

  As described above, the ONU according to the first embodiment includes an aggregate packet generator configured as a functional block as illustrated in FIG. 3. When the aggregate packet generator passes through the ONU, The duplicate Ethernet header is deleted, and as shown in FIG. 6, an aggregated Ethernet packet can be generated and transmitted to the LTUOLT.

  On the other hand, the LTUOLT in the first embodiment includes a disassembled packet generator configured as a functional block as shown in FIG. 4, and this disassembled packet generator concatenates the aggregated packets received from the ONU. Based on the information, it is possible to reconstruct a regular Ethernet packet in which the Ethernet header is added to each piece of data.

  As described above, according to the first embodiment, a packet communication system including an aggregate packet generator on the ONU side and a disassembled packet generator on the LTUOLT side is realized. As a result, the gap between the Ethernet header and the Ethernet packet can be eliminated. Therefore, even when the allocation amount from the OLT is not sufficient, data transmission from the ONU can be performed without delay, and transmission speed can be improved and transmission delay can be reduced.

  Furthermore, according to the first embodiment, there is a configuration in which data connection information is added to the end of an Ethernet packet. By providing such a configuration, it is possible to output an Ethernet packet that arrives at the ONU just before the transmission end time of the ONU, and it is possible to improve transmission speed and reduce transmission delay.

Embodiment 2. FIG.
In the first embodiment, the case where the OLT gives the GRANT length according to the data amount requested from the ONU has been described. In contrast, in the second embodiment, a case will be described in which the maximum Ethernet packet length is reflected in the GRANT length assigned by the OLT in the OLT.

  FIG. 7 is a diagram showing a functional block configuration of the OLT according to the second embodiment of the present invention. Compared to the configuration of FIG. 3 in the first embodiment, the OLT 310 shown in FIG. 7 differs in that it further includes a reception information extraction unit 300, a PON bandwidth calculation unit 301, and a maximum packet length determination unit 302. ing. Therefore, these differences will be mainly described below.

  The reception information extraction unit 300 has a function of receiving data amounts 303 and 304 that are scheduled to arrive at the radio master stations 202 and 206 that are higher-level devices, and calculating the amount and timing of data that arrives at the OLT 310.

  The maximum packet length determination unit 302 has a function of determining the maximum Ethernet packet length transmitted in the PON section. Further, the PON bandwidth calculation unit 301 has a function of calculating the GRANT length to the ONU. The ONU configuration is the same as that of the first embodiment.

  Next, the operation will be described. The maximum packet length determination unit 302 in the OLT 310 adjusts and determines the maximum Ethernet packet length transmitted from the ONU 100 to the ONU 100 in advance. The reception information extraction unit 300 calculates the arrival timing and the data amount from the data amounts 303 and 304 and outputs them to the PON bandwidth calculation unit 301.

  The PON bandwidth calculation unit 301 determines the GRANT length and transmits it to the ONU 100 assuming that the amount of data to arrive is transmitted with the maximum Ethernet packet length. The operation of ONU 100 is the same as that of the first embodiment.

  As described above, according to the second embodiment, by defining the maximum Ethernet packet length between the OLT and the ONU, it is possible to reflect the maximum Ethernet packet length in the GRANT length assigned by the OLT. As a result, when the OLT calculates the GRANT length, it is possible to determine the number of Ethernet packets, accurately grasp the overhead length accompanying the Ethernet packet, and exceed the GRANT length necessary for the ONU to transmit data. Can be allocated without shortage.

Embodiment 3 FIG.
In the first embodiment, the case has been described where connection information, which is information related to data connection / division, is added to the end of an Ethernet packet. On the other hand, this Embodiment 3 demonstrates the case where such connection information is provided immediately after an Ethernet header.

  The configuration in the third embodiment is the same as that in the first embodiment. When the ONU 100 receives an Ethernet packet from the wireless slave station 105, the header check unit 103 and the header deletion unit 102 perform the same processing as in the first embodiment.

  The output packet number calculation unit 107 calculates the number of Ethernet packets that can be accommodated in the GRANT length and the data length according to the maximum Ethernet packet length determined by the maximum packet length determination unit 106 and instructs the packing unit 101 to output.

  The link information adding unit 109 adds link information to the head of the data and outputs it to the header adding unit 108. The header assigning unit 108 assigns an Ethernet header to the head to form one Ethernet packet.

  When the OLT 200 receives the Ethernet packet from the ONU 100, the OLT 200 sequentially reconstructs the Ethernet packet based on the connection information given to the head.

  As described above, according to the third embodiment, there is a configuration in which the connection information is added to the head portion of the Ethernet packet. As a result, when the Ethernet packet is reconstructed by the OLT, it is possible to sequentially reconstruct it based on the connection information. Therefore, the transmission delay can be reduced by shortening the residence time of the Ethernet packet in the OLT.

Claims (4)

In a packet communication system in which a plurality of subscriber devices share a transmission line and communicate with a station side device in a time division multiplexing system,
Each of the plurality of subscriber devices deletes duplicate header information from communication packets having the same header information with respect to a plurality of input communication packets, and exists in each communication packet after the header information is deleted. Concatenating a plurality of data, generating an aggregate packet with concatenation information, and having an aggregate packet generator for transmitting the generated aggregate packet as a regular communication packet to the station side device,
The station side device, when receiving the aggregate packet, decomposes the plurality of data included in the aggregate packet based on the connection information, and reconstructs the plurality of communication packets Have
The aggregate packet generator includes:
A header check unit that checks a header including destination information of the plurality of input communication packets and discriminates packets having the same header information;
A header deletion unit for deleting headers of the plurality of communication packets;
A maximum packet length determination unit that determines a maximum packet length of one packet transmitted by each of the plurality of subscriber devices by communicating with the station side device;
Within a range that can be accommodated in the maximum packet length, a plurality of data having the same header information and having the header deleted are continuously connected or divided into the one packet having the maximum packet length. A packing unit for generating concatenated data having one continuous data configuration accommodated in
A link information adding unit that generates link information as information related to the link location of the link data, and adds the link information to the link data;
Wherein one of the header information corresponding to the same header information assigned to the connecting data, see contains a header imparting section for the one packet and configuration of the normal communication packet,
The aggregate packet generator can continuously transmit at one transmission opportunity based on the maximum packet length determined by the maximum packet length determination unit and the transmittable time allocated from the station side device. A packet number calculation unit for calculating the number of packets of the maximum packet length;
The packing unit generates the concatenated data based on the number of packets and the maximum packet length,
The station side device
A maximum packet length determiner that determines the maximum packet length by communicating with the subscriber unit;
A reception information extractor for receiving information on the amount of data scheduled to arrive at the wireless master station from a wireless master station which is a host device;
Assuming that the amount of data scheduled to arrive at the wireless master station is transmitted from the subscriber unit with the maximum packet length, the transmission time is determined, and the determined transmission time is determined as the subscriber unit. Bandwidth calculator to send to
A packet communication system further comprising: A subscriber device that is applied to a packet communication system in which a plurality of subscriber devices share a transmission path and communicate with a station-side device in a time division multiplexing manner,
A header check unit that checks a header including destination information of a plurality of input communication packets and discriminates packets having the same header information;
A header deletion unit for deleting headers of the plurality of communication packets;
A maximum packet length determining unit that determines a maximum packet length of a communication packet transmitted by each of the plurality of subscriber devices;
Within a range that can be stored in the maximum packet length, a plurality of pieces of data having the same header information and having the header deleted are continuously connected, and one received in one packet having the maximum packet length A packing unit for generating concatenated data having a continuous data structure;
A link information giving unit that gives the linked data as information about the linked location of the linked data,
A header adding unit that adds one header information corresponding to the same header information to the concatenated data and generates a consolidated packet by configuring the one packet as a regular communication packet. A packet generator;
A subscriber unit comprising: a transmission / reception control unit that makes a bandwidth request to the station side device in accordance with the accumulated amount of the aggregated packet. A station-side device applied to a packet communication system in which a plurality of subscriber devices share a transmission path and communicate with a station-side device in a time-division multiplexing method,
A maximum packet length determining unit that communicates with each of the plurality of subscriber devices and determines a maximum packet length of a section sharing the transmission path;
With respect to a plurality of communication packets input to each of the plurality of subscriber devices, duplicate header information is deleted from communication packets having the same header information, and each communication packet after the duplicate header information is deleted Concatenated data having one continuous data configuration is generated by continuously connecting a plurality of existing data, and an aggregation packet to which connection information corresponding to information related to a connection portion of the connection data is added A receiver for receiving from each of a plurality of subscriber units;
A decomposed packet generator that decomposes the concatenated data included in the aggregate packet based on the concatenation information and reconstructs the plurality of communication packets when the aggregate packet is received ;
A reception information extractor for receiving information on the amount of data scheduled to arrive at the wireless master station from a wireless master station which is a host device;
Assuming that the amount of data scheduled to arrive at the wireless master station is transmitted from the subscriber unit with the maximum packet length, the transmission time is determined, and the determined transmission time is sent to the subscriber unit. A station-side device having a bandwidth calculator for transmission . In a packet communication method in which a plurality of subscriber devices share a transmission path and communicate with a station-side device in a time division multiplexing method,
In each of the plurality of subscriber devices,
A first step of checking a header including destination information of a plurality of input communication packets and determining a packet having preceding header information;
A second step of deleting headers of the plurality of communication packets;
A third step of determining a maximum packet length of one packet transmitted by each of the plurality of subscriber devices by communicating with a station side device;
Within a range that can be accommodated in the maximum packet length, a plurality of data having the same header information and having the header deleted are continuously connected or divided into the one packet having the maximum packet length. A fourth step of generating concatenated data having one continuous data structure accommodated in
A fifth step of generating information on a connection location of the connection data as connection information, and adding the connection information to the connection data;
A sixth step of adding one header information corresponding to the same header information to the concatenated data, generating an aggregate packet as a regular communication packet configuration, and transmitting the aggregate packet to the station side device;
In the station side device,
A seventh step of receiving the aggregate packet transmitted from each of the plurality of subscriber devices;
When receiving the aggregated packet, the connection data contained in the aggregated packet is decomposed on the basis of the connection information, it has a eighth step of reconstructing the plurality of communication packets,
In each of the plurality of subscriber devices,
Based on the maximum packet length determined in the third step and the transmittable time allocated from the station side device, the number of packets of the maximum packet length that can be continuously transmitted in one transmission opportunity is calculated. 9th step
Further comprising
The fourth step generates the concatenated data based on the number of packets and the maximum packet length,
In the station side device,
A tenth step of determining the maximum packet length by communicating with the subscriber unit;
An eleventh step of receiving information on the amount of data scheduled to arrive at the wireless master station from a wireless master station that is a host device;
Assuming that the amount of data scheduled to arrive at the wireless master station is transmitted from the subscriber unit with the maximum packet length, the transmission time is determined, and the determined transmission time is determined as the subscriber unit. A twelfth step to send to
A packet communication method further comprising:

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