JP2021190858A - Communication system and communication control method - Google Patents

Abstract

To provide a communication system continuing a data communication of an application to be continued in a communication, and a control method.SOLUTION: In a communication system, at the time when a connection of a mobile body terminal 2 is established in radio subsystems 13-1 and 2, a connection establishment message is transmitted to packet processing devices 12-1 and 2 from a radio subsystem. When each packet processing device receives the connection establishment message, a mobile body ID and the radio subsystem are specified from the received connection establishment message, and a corresponded part of a terminal connection state management table is changed during the connection. When the connection of the mobile body terminal is disconnected in the radio subsystem, a disconnection message is transmitted to the packet processing device from the radio subsystem. When the disconnection message is received by the packet processing device, the mobile body ID and the radio subsystem 13 are specified by the received disconnection message, and the corresponded part of the terminal connection state management table 1 is changed during the disconnection.SELECTED DRAWING: Figure 1

Description

The present invention relates to a communication system in which packet data of an application is transmitted by a plurality of wireless systems and stable transmission is continued even when the wireless systems are switched.

The International Railway Union UIC (International Railways) has replaced the GSM-R, which is currently used in wireless train control systems, with a new wireless system that is expected to end around 2030, and LTE (Long). In order to promote the sophistication of the railway system itself by utilizing wideband wireless systems such as Term Evolution) and 5G, we are proceeding with the formulation of standards for the next-generation railway wireless communication system FRMCS (Future Railway Mobile Communication System).

FRMCS aims to reduce costs by utilizing existing wireless access technologies such as LTE and 5G without customizing them, and realizes the communication quality required by various applications that realize railway systems using existing wireless access technologies. I am oriented.

Also, assuming migration from GSM-R to LTE, 5G, etc., for example, when a train moves from an area where coverage is formed by GSM-R to an area where coverage is formed by 5G, ETCS (European Train Control) Smoothly switch the wireless system from GSM-R to 5G without interrupting the bidirectional transmission of train control information by System) and without being aware of the application that handles the train control information, that is, seamless between the wireless systems. Realization of handover is defined as a requirement of FRMCS.

Methods for realizing seamless handover between wireless systems are disclosed in, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2004-274458) and Patent Document 2 (Japanese Patent Laid-Open No. 2012-114742).

Patent Document 1 (Japanese Unexamined Patent Publication No. 2004-274458) includes a plurality of wireless access networks that communicate by different wireless access methods, and an edge node that connects these wireless access networks and a core network. A handover control system between different types of wireless systems that switches communication data from mobile communication terminal devices existing in a network by the plurality of different wireless access methods and transmits the communication data to the core network side. The mobile communication terminal device is a mobile communication terminal device. The edge node comprises a communication means for simultaneously transmitting the same data to a plurality of available wireless access networks when the data is transmitted in a position where a plurality of different wireless access networks can be used. A data selection means for selecting one of the same data from the mobile communication terminal device received via the different wireless access network according to a predetermined standard and transmitting the data to the core network side. Disclosed is a handover control system between different types of wireless systems, characterized in that it is provided (see claim 1).

Patent Document 2 (Japanese Unexamined Patent Publication No. 2012-114742) is a wireless communication device applied to a heterogeneous wireless communication system that performs wireless communication using at least one of a plurality of types of wireless communication methods, and is different from each other. A plurality of wireless modules that perform wireless communication by a method, an application unit that operates an application, and the wireless module to be operated are switched, and when the wireless module is switched, the wireless module is switched to the application unit. The application unit is provided with a switch unit for notifying the above, and when the notification is received from the switch unit while the data is being acquired, the application unit acquires only the unacquired data among the data to be acquired. A wireless communication device characterized by activating a resume function is disclosed (see claim 1).

Japanese Unexamined Patent Publication No. 2004-274458 Japanese Unexamined Patent Publication No. 2012-114742

For a mobile that moves in an area where coverage is secured by multiple wireless systems, data communication related to the same application is continued even if the wireless system to which the mobile can transmit data changes due to the movement of the mobile. That is the aim of the present invention.

Even if the mobile moves from the coverage of the wideband wireless system to the coverage of the narrowband wireless system, if the application does not need to be aware of the switching of the wireless system, the behavior of each application changes before and after the switching of the wireless system. do not do. As a result, the data communication of the application running in the wideband wireless system exceeds the transmission capacity of the narrowband wireless system, so that the packet loss of the application occurs in the narrowband wireless system.

It should be noted here that some applications need to continue communication even after the wireless system is switched, and some applications do not. In the prior art document, the data communication of the application is continued when the wireless system is switched, but the problem of packet loss described above cannot be avoided.

The present invention distinguishes between an application that continues communication even when the wireless communication system is switched and an application that terminates communication, and selectively provides seamless handover between wireless systems only for the application that continues communication. The purpose is to provide.

A typical example of the invention disclosed in the present application is as follows. That is, it is a communication system that comprehensively handles the packet data flow of at least one application on a plurality of wireless systems, and information in which one or a plurality of wireless systems used for data transmission is defined for each at least one application. When the connection of the mobile terminal is established in a certain wireless system, it is characterized in that, based on the above definition, it is selectively determined whether or not data transmission is possible for each of at least one application in the wireless system. ..

According to one aspect of the present invention, data communication of an application for which communication should be continued can be continued. Issues, configurations and effects other than those mentioned above will be clarified by the description of the following examples.

It is a figure which shows the Example of the communication system. It is a figure which shows the Example of the packet processing apparatus. It is a figure which shows the Example of the terminal connection state management table. It is a figure which shows the Example of the wireless system application policy table. It is a flowchart of the process executed by the received packet processing part. It is a flowchart of the process executed by the transmission packet processing unit.

<Example 1>
FIG. 1 shows an embodiment of a communication system according to the present invention.

In the communication system, as a whole, the center-side device group 1 having the center-side application server group that communicates with the applications mounted on a large number of mobile bodies and each mobile terminal 2 wirelessly communicate with each other via the wireless subsystem 13. To carry out. There may be a plurality of mobile terminals 2.

The application processing device 11 has a wired network interface and is typically composed of a general-purpose server or an industrial PC. In this embodiment, it is assumed that different devices are used for each application, but a plurality of applications may operate on the same device. However, in that case, either have multiple network interfaces or assign different port numbers to each application. Further, the application processing devices 11 are arranged on the center side and the mobile terminal side, respectively, and the application processing devices 11 communicate with each other via radio in one direction or in both directions.

The packet processing device 12 is a device having a function peculiar to the present invention, and is logically arranged between the application processing device 11 and the wireless subsystem 13.

The packet processing device 12 duplicates the packet input from the application processing device 11 as necessary and transfers it to one or a plurality of wireless subsystems 13, and among the packets input from the wireless subsystem 13, a plurality of radios. While paying attention to the existence of the same packet that has passed through the subsystem 13, the duplicated packet is discarded and only the necessary packet is transferred to the appropriate application processing device 11. The packet processing device 12 functions as an L3 router having a conditional input packet copying function and a deduplication function, is composed of a general-purpose server provided with a wired network interface, and the function is realized by software.

The wireless subsystem 13 is, for example, an entire LTE or 5G system, that is, a system including a core network, a base station, and a mobile terminal 2. In the wireless subsystem 13, a node having an L3 router function is logically arranged at an end facing the packet processing device 12 side on the center side and the mobile terminal side. In the case of LTE, P-GW and UE provide the function. That is, when viewed from the application processing device 11, the packet processing device 12 on the center side, the packet processing device 12 on the mobile terminal side, and the two nodes that provide the L3 router function in the wireless subsystem, a total of four locations. It is considered to be a system that passes through an L3 router. From the viewpoint of the present invention, the wireless subsystem 13 is considered to be a group of L3 routers that transfer packets passing between the end on the center side and the end on the mobile terminal side.

FIG. 2 shows an embodiment of the packet processing device 12 according to the present invention.

An L2 switch 102 is arranged between the application processing device 11 and the wireless subsystem 13. The application processing device 11 is connected to another device in the network interface 101, and in the wireless subsystem 13, the node 103 corresponding to the L3 router is exposed to the L2 switch 102. The L2 switch 102 is also connected to the packet processing device 12 having the network interface 101.

Regarding the inside of the packet processing device 12, the packet input from the network interface 101 is input to the received packet processing unit 104. The details will be described later with reference to FIG. 5, but the received packet processing unit 104 determines whether the input packet is the target of L3 routing or the message addressed to the packet processing device 12, and the input packet is L3. If it is a routing target, it is forwarded to the transmission packet processing unit 107, and if the input packet is a message addressed to the packet processing device 12, the received message is analyzed and the analyzed information is stored in various tables.

The terminal connection state management table 105 holds a state of which wireless subsystem 13 each terminal is connected to or disconnected from. Details will be described later with reference to FIG.

The wireless system application policy table 106 is a table in which a policy for which wireless subsystem 13 each application transmits data is defined. Details will be described later with reference to FIG.

The transmission packet processing unit 107. From the received packet processing unit 104, the input packet that is output as it is and the tag information indicating the mobile terminal 2 and the application to which the packet is associated are input.

The detailed operation of the transmission packet processing unit 107 will be described later with reference to FIG. 6, but for these inputs, it is determined to which radio subsystem 13 the packet is forwarded or to which application processing device 11 the packet is forwarded. Then, the function equivalent to the L3 router that forwards the packet is executed.

FIG. 3 shows an embodiment of the terminal connection state management table 105 according to the present invention.

The identifiers (mobile IDs) of the mobile terminal 2 are arranged in the vertical direction of the table, and the wireless subsystem 13 is arranged in the horizontal direction.

For each mobile terminal 2, the wireless subsystem 13 for which a data path has been established is connected (marked with O in the figure), and the wireless subsystem 13 for which a data path has not been established is disconnected (marked not in the figure). I manage it.

Consider state transitions. Immediately after starting the entire system, all fields are in the disconnected state. When the connection of the mobile terminal 2 is established in the wireless subsystem 13, the connection establishment message is transmitted from the wireless subsystem 13 to the packet processing device 12. When the packet processing device 12 receives the connection establishment message, the received packet processing unit 104 identifies the mobile ID and the wireless subsystem 13 from the received connection establishment message, and changes the corresponding part of the terminal connection status management table 105 during connection. Let me.

The connection establishment message includes the message of connection establishment and the IP address for external access assigned to the mobile terminal 2 in the wireless subsystem 13.

When the connection of the mobile terminal 2 is disconnected in the wireless subsystem 13, the connection disconnection message is transmitted from the wireless subsystem 13 to the packet processing device 12. When the packet processing device 12 receives the connection disconnection message, the received packet processing unit 104 identifies the mobile ID and the wireless subsystem 13 from the received connection disconnection message, and changes the corresponding part of the terminal connection status management table 105 during disconnection. Let me.

The connection disconnection message includes an IP address that is a connection disconnection message and is issued to the mobile terminal 2 and released by the disconnection.

For either message, the packet processing device 12 can identify from which radio subsystem 13 the message was transmitted by the source of the IP packet to which the message was transmitted. Information identifying the source wireless subsystem 13 may be added to the message. The IP address assigned to the mobile terminal 2 and the mobile ID in FIG. 3 may be separately associated with each other, or the IP address may be used as the mobile ID. In this embodiment, the mobile ID is treated as equivalent to the IP address.

FIG. 4 shows an embodiment of the wireless system application policy table 106 according to the present invention.

The application identifiers are lined up in the vertical direction of the table, and the wireless subsystem 13 is lined up in the horizontal direction.

This table manages the policy of whether or not to transmit data using each wireless subsystem for each application (marked with O in the figure) or not (marked with no mark in the figure). For example, the application with application ID 1 indicates that the policy is to transmit data using the wireless subsystem 1 and the wireless subsystem 2. The wireless subsystem actually used depends on the connection state of the mobile terminal 2, and both wireless subsystems are used for the mobile terminal 2 to which both the wireless subsystem 1 and the wireless subsystem 2 are connected. However, for the mobile terminal 2 to which only one of them is connected, only the wireless subsystem to which the mobile terminal 2 is connected is used, depending on the wireless subsystem connection state of the mobile terminal 2. To decide.

This table may be initialized to the default value at system startup as the default value. Alternatively, assuming that all the initial states are not transmitted (unmarked), a policy setting message for policy setting is defined, and this policy setting message is sent to an IP packet whose source is the application processing device 11 and whose destination is the packet processing device 12. It may be placed on the device and transmitted from the application processing device 11. Upon receiving this policy setting message, the received packet processing unit 104 analyzes the content of the received policy setting message and updates the wireless system application policy table 106.

The policy setting message includes information that can identify the application identifier and 1-bit information indicating whether or not each application may execute data communication in each wireless system. The content of the message may be defined so that multiple applications can be set. Further, for the messages that can be transmitted by each application processing device 11, only the policy related to the application running on the application processing device 11 can be set, and the policy access authority is set so that the policy related to other application processing devices 11 cannot be set. You may decide.

FIG. 5 is a flowchart of processing executed by the received packet processing unit 104 according to the present invention. The processing flow shown in FIG. 5 is executed for each of the input packets.

In S1001, a packet is input to the received packet processing unit 104. When a plurality of packets are input in succession, this flow is operated continuously or in parallel for a plurality of packets.

In S1002, the destination IP address of the input packet is inspected, and it is determined whether the destination IP address is that of the received packet processing unit 104, that of the application processing device 11, or that of the wireless subsystem 13. When the input packet is addressed to the received packet processing unit 104, the policy update of the packet processing unit or the transition of the terminal connection state, that is, the table update processing in the packet processing device 12 follows, so the process proceeds to S1005. On the other hand, if the input packet is addressed to the application processing device 11 or the wireless subsystem 13, the process proceeds to S1003 because it is subject to L3 routing.

In S1003, the mobile terminal 2 and the application related to the input packet targeted for L3 routing are specified. As the information relating the mobile terminal 2 and the application, it is preferable to use the destination IP address of the input packet and the same port number as the source IP address. If necessary, TCP or UDP port numbers may be used.

When the input IP packet is a packet directed from the application processing device 11 to the wireless subsystem 13, the source is associated with the application and the destination is associated with the mobile terminal 2. The opposite relationship applies to packets in the opposite direction. For this IP address collation, the IP address of the application processing device 11 is held in advance in the received packet processing unit 104 as a fixed value. As the IP address of the mobile terminal 2, the received packet processing unit 104 holds the IP address of the mobile terminal 2 found from the connection establishment message described in FIG.

By the above processing, tags of the mobile identifier and the application identifier are generated for the input IP packet.

In S1004, the input IP packet itself and a set of tag information including information related to the IP packet generated in S1003 are output to the transmission packet processing unit 107.

In S1005, the content of the message is determined on the premise that the input IP packet is destined for the packet processing device 12, that is, the message requests the update of the table of the packet processing device 12. There are two types of messages: a request to change the connection state of the terminal and a request to change the policy for determining the wireless subsystem 13 applied to the data transmission of each application. The contents of the message will be omitted because they are described with reference to FIGS. 3 and 4, but if the message requests to change the connection status of the terminal, the process proceeds to S1006, and if the request requests to change the policy, the process proceeds to S1007.

In S1006, as described with reference to FIG. 3, the terminal connection state management table 105 is updated according to the received message content.

In S1007, as described with reference to FIG. 4, the wireless system application policy table 106 is updated according to the received message content.

When the processing of S1004, S1006, or S1007 is completed, the received packet processing related to the packet is completed.

FIG. 6 is a flowchart of processing executed by the transmission packet processing unit 107 according to the present invention.

In S1101, the IP packet to be transmitted and the set of tag information for identifying the mobile terminal 2 and the application are input to the transmission packet processing unit 107 from S1004 in the flowchart of the reception packet processing unit 104. Each time this set is input, the process of FIG. 6 is executed.

In S1102, the destination IP address of the input packet is inspected to determine whether the destination IP address is that of the application processing device 11 or that of the wireless subsystem 13. Specifically, the destination IP address of the input IP packet and, if necessary, the destination port number of TCP or UDP are referred to, and this reference information points to the application processing device 11 or the wireless subsystem 13. Determine if it is. If the destination points to the wireless subsystem 13, the process proceeds to S1103, and if the destination points to the application processing device 11, the process proceeds to S1109.

S1103 to S1108 are processing groups when the destination of the input packet is the wireless subsystem 13, and whether or not each wireless subsystem 13 is the destination of the IP packet for all the operating wireless subsystems 13. Is determined, and the input packet is forwarded to all the destination wireless subsystems 13, resulting in a for loop.

In S1104, the wireless system application policy table 106 of FIG. 4 indicates whether or not the application indicated by the identifier included in the tag information of the input packet performs data transmission using the wireless subsystem 13 pointed to by the index of the for loop. Judge as a standard. If the application does not use the wireless subsystem 13, the process proceeds to S1108 in order to skip the subsequent processing and make a determination regarding the next wireless subsystem 13. If the application uses the wireless subsystem 13, the process proceeds to S1105.

In S1105, whether or not the mobile terminal 2 indicated by the identifier included in the tag information of the input packet is connected to the wireless subsystem 13 pointed to by the index of the for loop is determined based on the terminal connection state management table 105 of FIG. judge. If the mobile terminal 2 is not connected to the wireless subsystem 13, the process proceeds to S1108 in order to skip the subsequent processing and make a determination regarding the next wireless subsystem 13. If the mobile terminal 2 is connected to the wireless subsystem 13, the process proceeds to S1106.

In S1104 and S1105, the mobile terminal 2 is determined by the AND condition that the application related to the input packet is the data transmission target of the wireless subsystem and the mobile terminal 2 is connected to the wireless subsystem. The relationship between the application and the application is determined.

In S1106, in order to duplicate the input packet to be transferred to the wireless subsystem 13 and transfer it to the wireless subsystem 13, the L3 router rewrites the MAC address to that of the node corresponding to the L3 router of the wireless subsystem 13. Implement the function. When one input packet is transferred to a plurality of wireless subsystems 13 through a for loop, a packet having the same content in which only the MAC address of the input packet is rewritten to that of each wireless subsystem 13 is output.

In S1107, the transfer packet generated in S1106 is sent to the network interface 101. When the processing up to S1108 is completed for all the wireless subsystems, the processing for the input packet is completed.

On the other hand, when it is determined in S1102 that the destination of the input packet is the application processing device 11, basically, since the received packet is transferred to the application processing device 11 as it is, only the MAC address is that of the application processing device 11. Provides an L3 router function that rewrites to. However, the later-arriving packet among the plurality of the same packets that arrived is discarded so that the duplicated packet that has passed through the plurality of wireless subsystems 13 from the same information source is not transferred to the application processing device 11.

In S1109, it is determined whether or not the input packet has already been received. Information on whether the packet has been received is prepared by temporarily storing the sequence number related to the received packet (included in the header in the case of TCP or separately assigned in the case of UDP) in the transmission packet processing unit 107. can. In S1109, the duplication of packets is determined by comparing the temporarily stored information with the information of the input packet. If the input packet has been received, the process proceeds to S1113, and if the input packet has not been received, the process proceeds to S1110.

In S1110, when the input packet has not been received, the sequence number information in the input packet is read and temporarily stored.

In S1111, in order to forward the input packet to be forwarded to the application processing device 11 to the application processing device 11, the L3 router function of rewriting the MAC address to that of the application processing device 11 is implemented.

In S1112, the transfer packet generated in S1111 is transmitted to the network interface 101.

In S1113, when it is determined in S1109 that the input packet has been received, the input packet is discarded in order to prevent the transfer of the extra duplicate packet to the application processing device 11. Since the first received packet has already been transferred to the application processing device 11 by the processing of S1110 to S1112, the late arrival packet having the same content as the received packet is discarded in S1113.

As described above, the communication system of the embodiment of the present invention is a communication system that collectively handles the packet data flow of at least one application (application processing device 11) on a plurality of wireless systems (radio subsystem 13). That is, when one or more wireless systems 13 used for data transmission for each at least one application 11 hold the defined information and the connection of the mobile terminal 2 is established in a certain wireless system 13, the above-mentioned Based on the definition, the wireless system 13 selectively determines whether or not data transmission is possible for each of at least one application 11. Therefore, as the mobile terminal 2 moves, the application data is communicated from the wideband wireless system to the narrowband wireless system. When switching routes, it is possible to avoid a situation in which all application data is congested, and an application that should continue communication can continue data communication.

Further, at a certain point in time, in a state where the mobile terminal 2 is allowed to use the plurality of wireless systems 13 for data transmission related to a certain application 11, the application 11 is the same through the plurality of permitted wireless systems 13. Since the packet data of the above is transmitted, the mobile terminal 2 that has established a connection with a plurality of wireless systems 13 can stabilize the data transmission by parallel transmission of the same packet data through the plurality of wireless systems, and the path diversity can be achieved. It is possible to improve the reliability of wireless communication and realize seamless handover between wireless systems 13.

Further, at a certain point in time, for data transmission related to a certain application 11, the mobile terminal 2 cannot communicate with one of the plurality of wireless systems 13 in a state where the use of the plurality of wireless systems 13 is permitted for the mobile terminal 2. In the case of, if the mobile terminal 2 can communicate with at least one other wireless system 13, the data related to the application is transmitted, so that the application for which the communication should be continued uses the other wireless system 13 for the data. Communication can be continued.

Further, the packet processing device 12 identifies the application 11 and the mobile terminal 2 to which the packet data is associated, all the specified applications 11 can be used, and the specified mobile terminal 2 has established a connection. Since the same packet data is transmitted through the wireless system 13, the mobile terminal 2 that has established a connection with the plurality of wireless systems 13 can transmit the same packet data in parallel through the plurality of wireless systems, and wireless communication by path diversity. It is possible to improve the reliability of the system and realize seamless handover between the wireless systems 13.

Further, the packet processing device 12 temporarily stores the received packet data or information indicating the uniqueness of the received packet data (for example, a sequence number), and receives the packet data while referring to the stored information. If it is determined that the newly received packet data or the information indicating the uniqueness of the newly received packet data (for example, the sequence number) is the same as the stored contents, the newly received packet data is discarded. Since the processing is executed, in order to improve the reliability of wireless communication, the same data packet transmitted in parallel by a plurality of wireless systems 13 is not passed to the application 11 as it is, and the extra packet is discarded in the packet processing device 12. Therefore, regardless of whether the application 11 side uses a plurality of wireless systems 13, it is sufficient to implement packet data processing without duplication, so that the amount of packet data directly processed by the application 11 can be reduced.

Further, the packet processing device 12 stores information defining the wireless system 13 that can be used by the application 11, and receives a notification from the wireless system 13 regarding the establishment and disconnection of the connection between the wireless system 13 and the mobile terminal 2. Since the connection information of the wireless system to which the mobile terminal 2 can be connected is stored, the wireless system 13 that can be used for each preset application 11 and the real-time wireless system 13 for each mobile terminal 2 are connected. Based on the state, real-time wireless system handover according to the connection state of the wireless system 13 of the mobile terminal 2 can be realized.

Further, the packet processing device 12 assigns an independent sequence number to the packet data for each combination of the application 11 and the mobile terminal 2 as information indicating the uniqueness of the input packet data, and then assigns the sequence number. Since the packet data is transmitted through the wireless system 13, even if the input data packet does not have a sequence number as in the case of a protocol such as UDP, each data packet is unique. Of the data packets transmitted from the wireless system in the direction of the application, duplication of data packets that have passed through multiple wireless systems can be eliminated. As a result, the amount of packet data directly processed by the application can be reduced.

It should be noted that the present invention is not limited to the above-mentioned examples, but includes various modifications and equivalent configurations within the scope of the attached claims. For example, the above-described examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to those having all the described configurations. Further, a part of the configuration of one embodiment may be replaced with the configuration of another embodiment. Further, the configuration of another embodiment may be added to the configuration of one embodiment. In addition, other configurations may be added / deleted / replaced with respect to a part of the configurations of each embodiment.

Further, each configuration, function, processing unit, processing means, etc. described above may be realized by hardware by designing a part or all of them by, for example, an integrated circuit, and the processor realizes each function. It may be realized by software by interpreting and executing the program to be executed.

Information such as programs, tables, and files that realize each function can be stored in a memory, a hard disk, a storage device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

In addition, the control lines and information lines show what is considered necessary for explanation, and do not necessarily show all the control lines and information lines necessary for mounting. In practice, it can be considered that almost all configurations are interconnected.

1 ... Center-side device group 2 ... Mobile terminal 11 ... Application processing device 12 ... Packet processing device 13 ... Wireless subsystem 101 ... Network interface 102 ... L2 switch 103 ... L3 router equivalent node 104 ... Received packet processing unit 105 ... Terminal connection Status management table 106 ... Wireless system application policy table 107 ... Transmission packet processing unit

Claims (14)

A communication system that comprehensively handles the packet data flow of at least one application on multiple wireless systems.
For each of the at least one application, one or more wireless systems used for data transmission retains defined information.
A communication system characterized in that, when a connection of a mobile terminal is established in a wireless system, data transmission availability is selectively determined for each of at least one application in the wireless system based on the above definition. The communication system according to claim 1.
At a point in time, for data transmission about an application, the same packet data about the application is delivered through the authorized radio systems while the mobile terminal is allowed to use the plurality of radio systems. A communication system characterized by transmission. The communication system according to claim 2.
At some point, in a state where the mobile terminal is allowed to use the plurality of wireless systems for data transmission related to an application, the mobile terminal cannot communicate with one of the plurality of wireless systems. A communication system, characterized in that it transmits data about the application, if the mobile terminal is communicable in at least one other wireless system. The communication system according to claim 1.
A packet processing device that executes processing on packet data transmitted from the application to the one or more wireless systems is provided.
The packet processing device is
Identify the application and mobile terminal to which the packet data is associated,
A communication system characterized in that the specified application is available and the specified mobile terminal transmits the same packet data through all wireless systems for which a connection has been established. The communication system according to claim 1.
A packet processing device that executes processing on packet data transmitted from the one or more wireless systems to the application is provided.
The packet processing device is
Temporarily stores the received packet data or information indicating the uniqueness of the received packet data.
The packet data is received while referring to the stored information, and the packet data is received.
When it is determined that the newly received packet data or the information indicating the uniqueness of the newly received packet data is the same as the stored contents, a deduplication process for discarding the newly received packet data is executed. A communication system characterized by The communication system according to claim 1.
A packet processing device for executing processing on packet data transmitted / received between the one or a plurality of wireless systems and the application is provided.
The packet processing device is
Stores information that defines the wireless system available to the application.
A communication system characterized by receiving a notification regarding establishment and disconnection of a connection between the wireless system and the mobile terminal from the wireless system and storing connection information of the wireless system to which the mobile terminal can be connected. .. The communication system according to claim 1.
A packet processing device for executing processing on packet data transmitted / received between the one or a plurality of wireless systems and the application is provided.
The packet processing device assigns an independent sequence number to the packet data for each combination of the application and the mobile terminal as information indicating the uniqueness of the input packet data, and then the sequence number is assigned. A communication system characterized in that packet data is transmitted through the wireless system. A communication control method in a communication system that comprehensively handles the packet data flow of at least one application on multiple wireless systems.
The communication system holds information defined by one or more wireless systems used for data transmission for each of the at least one application.
The communication control method selectively determines whether or not data transmission is possible for each of at least one application in the wireless system based on the definition when the communication system establishes the connection of the mobile terminal in the wireless system. A communication control method characterized by determination. The communication control method according to claim 8.
The communication system relates to a data transmission for an application at a time point through the authorized radio system while the mobile terminal is allowed to use the radio system. A communication control method characterized by transmitting the same packet data. The communication control method according to claim 9.
In the communication system, at a certain point in time, the mobile terminal may be used in one of the plurality of wireless systems in a state where the mobile terminal is allowed to use the plurality of wireless systems for data transmission related to an application. A communication control method comprising transmitting data relating to an application when communication becomes impossible, if the mobile terminal can communicate with at least one other wireless system. The communication control method according to claim 8.
The communication system has a packet processing device that executes processing on packet data transmitted from the application to the one or more wireless systems.
In the communication control method, the packet processing device identifies an application and a mobile terminal to which the packet data is associated, the specified application can be used, and the specified mobile terminal has already been connected. A communication control method characterized by transmitting the same packet data through all the wireless systems of. The communication control method according to claim 8.
The communication system has a packet processing device that executes processing on packet data transmitted from the one or more wireless systems to the application.
In the communication control method, the packet processing device temporarily stores received packet data or information indicating the uniqueness of the received packet data, and receives the packet data while referring to the stored information. If it is determined that the newly received packet data or the information indicating the uniqueness of the newly received packet data is the same as the stored contents, the deduplication process of discarding the newly received packet data is performed. A communication control method characterized by execution. The communication control method according to claim 8.
The communication system has a packet processing device that executes processing for packet data transmitted / received between the one or more wireless systems and the application.
In the communication control method, the packet processing device stores information defining a wireless system that can be used by the application, and notifies the wireless about establishing and disconnecting a connection between the wireless system and the mobile terminal. A communication control method that receives from a system and stores connection information of a wireless system to which the mobile terminal can be connected. The communication control method according to claim 8.
The communication system has a packet processing device that executes processing for packet data transmitted / received between the one or more wireless systems and the application.
In the communication control method, the packet processing device assigns an independent sequence number to the packet data for each combination of the application and the mobile terminal as information indicating the uniqueness of the input packet data, and then the packet data is described. A communication control method comprising transmitting packet data to which a sequence number is assigned through the wireless system.

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