JP4496733B2 - Mobile communication system and handover method used therefor - Google Patents

Description

  The present invention relates to a mobile communication system and a handover method used therefor, and more particularly to a handover process in a mobile network service.

  Currently, diversification and development of network access methods are progressing, and an environment in which a plurality of network access points can be used at a certain point is being developed.

  For example, there are many locations where the service areas of WLAN (Wireless LAN) overlap in the service area of the third generation mobile communication service, and terminals having these multiple access methods are beginning to exist. .

  In the mobile network service, a handover process due to terminal movement occurs. The handover process is a process of switching a base station that is a connection point between a network and a terminal or a higher-level device that accommodates the base station in accordance with the movement of the terminal.

  For example, in the case of a third generation mobile communication network, a base station called Node B is switched in response to a handover, and if there is more than a certain amount of terminal movement, an RNC (Radio Network Controller), which is a higher-level device, can also be used. Switch over.

  As the above handover processing, as shown in FIG. 8, a method that enables handover on a call basis has been proposed (for example, see Patent Document 1). In this method, handover is executed in accordance with the requested QoS of each call, but the network-side data transfer path at the time of handover is simply selected with the QoS in mind.

  In FIG. 8, the mobile communication system includes radio base stations (BS) 71 and 72, RNCs 61 and 62 that control the radio base stations 71 and 72, and service nodes that perform handover control on the RNCs 61 and 62. 4 and 5.

  In the service node 4, a multi-call handover control device 43 that controls handover for multi-calls, a handover application method determining device 41 that selects a handover method, a QoS management device 42 that manages QoS information, an anchor, A type handover control device 45 and a non-anchor type handover control device 46 are connected.

  The anchor-type handover control device 45 performs control to switch the line in such a manner that one point (specific node) on the route before switching is set as an anchor point and is left on the route. On the other hand, the non-anchor type handover control device 46 performs control to temporarily disconnect all the lines set up to the source base station, and set the optimum route to the destination base station again to switch the line.

JP 2002-159036 A

  In the above-described conventional handover process, the base station and the host device are switched on a terminal-by-terminal basis. However, when a handover is performed from the third generation mobile service area to the WLAN service area, all sessions in communication are transferred to the WLAN service side. Will be migrated.

  However, the current WLAN service has a narrow service area, and there is a high probability that the terminal will be out of service area. For example, in order to support continuous communications for mobile phone voice services, an access method with a large service area is better, but data download types such as WEB access can download data faster and in a shorter time. A good access method.

  Thus, network access has different QoS (Quality of Service). In an environment where such a variety of network access methods exist, a method is required in which an access method having an optimal QoS is found for each application or service and a handover to the access method can be performed.

  In the method described in Patent Document 1 above, handover is executed in accordance with the requested QoS of each call, but only the data transfer path on the network side at the time of handover is selected in consideration of QoS. The problem cannot be solved.

  Accordingly, an object of the present invention is to provide a mobile communication system capable of solving the above-described problems and realizing optimal access to each application data flow, and a handover method used therefor.

A mobile communication system according to the present invention is a mobile communication system including a session management device that performs signaling processing between terminals when wireless communication between terminals is performed via an IP (Internet Protocol) device in the network. There,
The session management device includes means for determining a data flow to be used by an application that is a handover target of each application-specific data flow that operates on the terminal, and the determined application of the handover target Means for notifying the IP device of information relating to the data flow,
The IP device includes means for executing a handover of the data flow for each application in accordance with a notification from the session management device, means for collecting QoS (Quality of Service) service quality information, and the QoS service quality information. Means for making a handover request to the session management apparatus when it is detected that the degradation of the transmission path quality has exceeded a reference value.

The handover method according to the present invention is used in a mobile communication system including a session management apparatus that performs signaling processing between terminals when communication between terminals performed wirelessly is performed via an IP (Internet Protocol) apparatus in the network. A handover method comprising:
The session management device determines a data flow to be used by an application that is a target of handover of each application-specific data flow that operates in the terminal, and the determined application of the handover target Performing information on data flow to the IP device;
The IP device performs a handover of the application-specific data flow according to the notification from the session management device, collects QoS (Quality of Service) service quality information, and the QoS service quality information. Performing a handover request to the session management apparatus when it is detected that the degradation of the transmission path quality has exceeded a reference value.

  That is, in the mobile communication system of the present invention, when a device accommodating a base station identifies an application level data flow in communication with each terminal and a handover is required, the QoS (Quality of Request) required by each application An optimum transmission path that satisfies (Service) is selected, and handover is executed in units of application-level data flows.

  Various application data flows flowing on an IP (Internet Protocol) network expect a certain communication quality for the IP network so that the user can use it without stress.

  In the case of a voice service, the bandwidth may be small, but an access method with a wide usable service area is convenient for the user. In the case of data download, broadband access is convenient for the user. The mobile communication system of the present invention has a function of executing a handover in accordance with the above application data flow, whereby an optimum access means can be provided for each application data flow.

  According to the present invention, by adopting the configuration and operation as described below, it is possible to obtain an effect that it is possible to realize optimum access to each application data flow.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a mobile communication system according to an embodiment of the present invention. 1, in the mobile communication system according to the embodiment of the present invention, routers 11 and 12 and a SIP (Session Initiation Protocol) management 13 are arranged on an IP (Internet Protocol) network (Network) 100.

  The routers 11 and 12 accommodate a third-generation mobile (3G) base station 21 and a WLAN (Wireless Local Area Network) base station 22 through which each area (3G area 200 or WLAN area 201) is accommodated. Location information and base station information.

  One physical port of the routers 11 and 12 accommodates one access method. That is, in the routers 11 and 12, the physical port # 0 accommodates the 3G base station 21, and the physical port # 1 accommodates the WLAN base station 22. The SIP management 13 performs a signaling process between the terminals 31 and 32 in SIP.

  The 3G base station 21 covers the 3G area 200, and the WLAN base station 22 covers the WLAN area 201. The 3G area 200 and the WLAN area 201 overlap. A portion where the terminal 31 is shown by a solid line indicates that the terminal 31 is located in a mixed area of the 3G area 200 and the WLAN area 201.

  A voice flow 301 indicates voice communication between the terminal 31 and the terminal 32, and an FTP (File Transfer Protocol) data flow 302 indicates a data download flow from the terminal 32 to the terminal 31. Since these flows are not handled as flows in units of applications on the IP network 100, they are handled as one packet flow between the terminals 31 and 32.

  Further, the portion where the terminal 31 is illustrated by a dotted line indicates the time when the terminal 31 is in the 3G area 200. In this case, the FTP data flow 302 is transferred via the 3G base station 21.

  The terminal IP address used by the terminal 31 is composed of a subnet prefix and a terminal ID (identification information). In this embodiment, the subnet prefix is used to identify the 3G / WLAN coverage area accommodated by the physical port of the router 11. The terminal ID is used as an ID for identifying each terminal in the 3G / WLAN cover area accommodated by the router 11.

  The router 11 periodically notifies the group of terminals located in each area of the subnet prefix by a router advertisement message. The terminal 31 that has received this router advertisement message creates a terminal IP address from the notified subnet prefix and terminal ID, and notifies the router 11 of the generated terminal IP address and the MAC (Media Access Control) address of the terminal 31. .

  The router 11 identifies the physical port to which the terminal 31 is connected from the subnet prefix of the terminal IP address, and the terminal IP address in the Destination Address field and the MAC of the terminal 31 in the Layer2 address field with respect to the forwarding table (not shown). The physical port number connected to the terminal 31 is registered in the address and output destination physical port number fields.

  When an IP packet arrives from the terminal 32, the router 11 checks the normality of the IP packet, and if it is a normal packet, extracts the Destination (DST) address (Address) and the Source / Destination port (Port) number.

  Next, the router 11 performs a forwarding search process using the forwarding table using the destination (DST) address and the source (SRC) / destination (DST) port number. In this forwarding search process, the data indicated by the output destination physical port number registered in the table data that matches the conditions indicates the physical port.

  If the corresponding table data does not exist, the router 11 sets the same IP address, selects the physical port # 0 if the output destination physical port number is 0, and selects the physical port # 1 if the output destination physical port number is 1. select. The received IP packet is transmitted toward the 3G base station 21 if it is the physical port # 0, and is transmitted toward the WLAN base station 22 if it is the physical port # 1.

  When the terminal 31 and the terminal 32 communicate, a session is set between the terminals 31 and 32 via the SIP management 13. By monitoring the session establishment process, the SIP management unit 13 recognizes a TCP (Transmission Control Protocol) / UDP (User Datagram Protocol) port number used by this session and holds the TCP / UDP port number.

  When the terminal 31 moves from an area of only the 3G area 200 to an area where the 3G area 200 and the WLAN area 201 coexist, and the terminal 31 finishes setting a WLAN link, the terminal 31 is connected to 2G via 3G and WLAN. Data can be sent and received via one route. Here, the terminal 31 sends a location notification to the SIP management 13. This location notification includes the terminal IP address and the MAC address of the terminal 31.

  When the FTP data flow 302 becomes a handover target and the process is executed, the SIP management 13 that has received the presence notification determines whether the voice flow 301 during communication and the FTP data flow 302 can be handed over.

  TCP / UDP port numbers for various application data flows are specified in the IETF (The Internet Engineering Task Force), so if the SIP management 13 determines the handover target, the TCP / UDP port number can be specified. It is.

  In this embodiment, it is assumed that the criterion is prepared in advance in the SIP management 13. However, the terminal 31 may specify a data flow to be handed over. In this case, TCP / UDP port number information for specifying the data flow is added to the above-mentioned location notification.

  Next, the SIP management 13 notifies the router 11 of information related to the FTP data flow 302. This information includes the terminal IP addresses of the terminals 31 and 32, the TCP / UDP port number, and the MAC addresses of the terminals 31 and 32.

  When the above information is notified from the SIP management 13, the router 11 generates a forwarding table based on the information. Here, the terminal IP address is registered in the Destination address field, the MAC addresses of the terminals 31 and 32 are registered in the Layer 2 address field, and the number of the connected physical port used by the terminals 31 and 32 is registered in the output physical port number field. .

  When there are a plurality of settings for the same Destination IP address in the forwarding search process, the router 11 matches the condition in which all the fields of the Destination address field, the Layer 2 address field, and the output destination physical port number field are set. Prioritize.

  When the above processing is performed, the data flow between the terminals 31 and 32 is divided into the voice flow 301 and the FTP data flow 302 in the router 11. The voice flow 301 continues to be communicated via the 3G base station 21, and the FTP data flow 302 continues to be communicated via the WLAN base station 22.

  As described above, in the embodiment of the present invention, a certain communication quality is expected for the IP network 100 so that the user can use various application data flows flowing on the IP network 100 without stress. ing.

  In the case of a voice service, the bandwidth may be small, but an access method with a wide usable service area is convenient for the user. In the case of data download, broadband access is convenient for the user.

  In the embodiment of the present invention, it is possible to provide an optimum access means for each application data flow by providing a function for executing a handover in accordance with the application data flow.

  Next, an embodiment of the present invention will be described. A mobile communication system according to an embodiment of the present invention has the same configuration as the mobile communication system according to the embodiment of the present invention shown in FIG.

  FIG. 2 is a diagram showing the structure of a forwarding table used for forwarding search processing according to an embodiment of the present invention. In FIG. 2, the forwarding table includes a Destination address (“10.10.10.10”,..., “11.11.11.11”, “12.12.12.12”), and an SRC / DST port. Number (“0/200”,..., “100/200”) and Layer 2 address (“11.11.11.11.11.11”, “22.22.22.22.22.22”) , ..., "33.33.33.33.33.33", "44.44.44.44.44.44"), and output destination physical port numbers ("0", "1") It is composed of

  FIG. 3 is a flowchart showing a handover process in a router according to an embodiment of the present invention. A handover process in the router 11 according to an embodiment of the present invention will be described with reference to FIGS.

  The terminal IP address used by the terminal 31 is composed of a subnet prefix and a terminal ID. In this embodiment, the subnet prefix is used to identify the 3G / WLAN coverage area accommodated by the physical port of the router 11. The terminal ID is used as an ID for identifying each terminal 31 in the 3G / WLAN cover area accommodated by the router 11.

  The router 11 periodically notifies the group of terminals located in each area of the subnet prefix by a router advertisement message. When receiving the router advertisement message, the terminal 31 creates a terminal IP address from the notified subnet prefix and terminal ID, and notifies the router 11 of the generated terminal IP address and the terminal MAC address.

  The router 11 identifies the physical port to which the terminal 31 is connected from the subnet prefix of the terminal IP address, and with respect to the forwarding table shown in FIG. 2, the terminal IP address in the Destination address field and the MAC address of the terminal in the Layer2 address field The physical port number to which the terminal 31 is connected is registered in the output destination physical port number field. At this point, the setting of the first row of the forwarding table shown in FIG. 2 is completed.

  FIG. 3 shows an outline of processing in the router (IP network 100 → 3G base station 21 / WLAN base station 22 direction processing outline). When an IP packet arrives from the terminal 32, the router 11 checks the normality of the IP packet (step S1 in FIG. 3). If the arrived IP packet is a normal packet, the router 11 extracts the Destination (DST) address and the Source / Destination port number (step S2 in FIG. 3).

  Next, the router 11 uses the destination (DST) address and the source (SRC) / destination (DST) port number to perform a forwarding search process using the above forwarding table (step S3 in FIG. 3). In the router 11, in the forwarding search process, the data indicated by the output destination physical port number registered in the table data matching the conditions indicates the physical port.

  If the corresponding table data does not exist, the router 11 sets the same IP address. If the output destination physical port number is 0, the physical port # 0 is selected. If the output destination physical port number is 1, the physical port # 1 is selected. Select.

  When the router 11 selects the physical port # 0 (step S4 in FIG. 3), the router 11 transmits the received IP packet to the 3G base station 21 (step S5 in FIG. 3). Further, when the router 11 selects the physical port # 1 (step S4 in FIG. 3), the router 11 transmits the received IP packet to the WLAN base station 22 (step S6 in FIG. 3).

  FIG. 1 shows a situation where the terminal 31 and the terminal 32 are communicating. When the terminal 31 and the terminal 32 communicate, a session is set between both the terminals 31 and 32 via the SIP management 13. The SIP management 13 recognizes the TCP / UDP port number used by this session by monitoring the session establishment process, and holds the TCP / UDP port number.

  FIG. 1 also shows that the terminal 31 has moved from an area of only the 3G area 200 to an area where the 3G area 200 and the WLAN area 201 are mixed. When the terminal 31 finishes setting the WLAN link, the terminal 31 can transmit and receive data through two routes, 3G and WLAN. Here, the terminal 31 sends a location notification to the SIP management 13. This location notification includes the terminal IP address and the MAC address of the terminal.

  FIG. 1 shows a state where the FTP data flow 302 is a handover target and the processing is executed. Upon receiving the location notification, the SIP management 13 determines whether or not the voice flow 310 and the FTP data flow 302 in communication can be handed over. Since TCP / UDP port numbers for data flows of various applications are defined in the IETF, if the SIP management 13 determines a handover target, it is possible to specify the TCP / UDP port numbers.

  In this embodiment, it is assumed that the criterion is prepared in advance in the SIP management 13. However, the terminal 31 may specify a data flow to be handed over. In this case, TCP / UDP port number information for specifying the data flow is added to the above-mentioned location notification.

  Next, the SIP management 13 notifies the router 11 of information related to the FTP data flow 302. This information includes the terminal IP addresses of the terminals 31 and 32, the TCP / UDP port number, and the MAC addresses of the terminals 31 and 32.

  When the above information is notified from the SIP management 13, the router 11 generates a forwarding table shown in FIG. 2 based on the information. Here, the terminal IP address is registered in the Destination address field, the MAC address of the terminal is registered in the Layer2 address field, and the number of the physical port to which the terminal is connected is registered in the output destination physical port number field. At this point, the setting of the second row of the forwarding table shown in FIG. 2 is completed.

  In the forwarding search process described above, when there are a plurality of settings for the same Destination IP address, the router 11 matches the condition with the line in which all fields of the Destination address field, the Layer 2 address field, and the output destination physical port number field are set. Give priority to the case.

  In the present embodiment, in the forwarding table shown in FIG. 2, the setting of the second row is prioritized over the first row. For example, when the setting for the same Destination IP address “10.10.10.10” is set to n rows, and the conditions do not match, the setting (SRC / DST) of the first row in the forwarding table shown in FIG. Lines with no port number set) are treated as default.

  When the above processing is performed, the data flow between the terminal 31 and the terminal 32 is divided into the voice flow 301 and the FTP data flow 302 in the router 11. The voice flow 301 continues to be communicated via the 3G base station 21, and the FTP data flow 302 continues to be communicated via the WLAN base station 22.

  FIG. 4 is a block diagram showing the internal configuration of the router according to one embodiment of the present invention. In FIG. 4, the router 11 includes a reception physical port (# 0) 111, an IP packet reception unit 112, a forwarding processing unit 113, a transmission physical port (# 0) 114, and a transmission physical port (# 1). 115, a forwarding table 116, and a table management unit 117.

  The reception physical port (# 0) 111 receives the Layer 2 packet, extracts the IP packet, and delivers the IP packet to the IP packet receiving unit 112. The IP packet receiving unit 112 checks the normality of the IP packet, and if the received IP packet is normal, extracts the TCP / UDP protocol port number information included in the received IP packet.

  Then, the IP packet receiving unit 112 delivers the received IP packet and the source / destination port number information to the forwarding processing unit 113. Further, if the received IP packet is abnormal, the IP packet receiving unit 112 discards the IP packet.

  The forwarding processing unit 113 searches the forwarding table 116 using the destination IP address (the destination IP address and the source / destination port number information) of the received IP packet as a search key. As a result of the search processing, the forwarding processing unit 113 When the Layer 2 address and the physical port number are obtained, the IP packet and the Layer 2 address are delivered to the transmission physical port (# 0) 114 or the transmission physical port (# 1) 115 according to the physical port number information.

  The transmission physical port (# 0) 114 and the transmission physical port (# 1) 115 each encapsulate the received IP packet from the forwarding processing unit 113 into a Layer 2 packet and transmit it.

  The forwarding table 116 has the configuration shown in FIG. The table management unit 117 updates the forwarding table 116 according to information from the SIP management 13. The SIP management 13 notifies the router 11 of information related to the FTP data flow 302. This information includes the terminal IP address of the terminal 31, the TCP / UDP port number, and the Layer 2 address (MAC address) of the terminal 31.

  FIG. 5 is a block diagram showing the internal configuration of SIP management according to an embodiment of the present invention. In FIG. 5, the SIP management 13 includes a message reception unit 131, a message transmission unit 132, a location management unit 133, and a handover control unit 134.

  The message receiving unit 131 receives the SIP message and performs message distribution processing. In other words, the message receiving unit 131 delivers the SIP message to the location management unit 133 if it is a presence notification, and delivers the SIP message to the message transmission unit 132 if it is any other SIP message.

  Further, the message receiving unit 131 monitors each session establishment process, recognizes the IP address and TCP / UDP port number of terminals related to each session, and determines the IP address and TCP / UDP port number. Hand over to the handover controller 134.

  The message transmission unit 132 transmits the received SIP message. The location management unit 133 manages the terminal IP address and Layer 2 address (MAC address) of each terminal based on the presence notification. In this case, the location management unit 133 identifies each terminal by a terminal ID used as a part of the terminal IP address.

  Further, the location management unit 133 knows in which of the 3G / WLAN the terminal 31 is located by the subnet prefix used as a part of the terminal IP address. When the terminal 31 is located in the 3G area and the terminal IP address having a new 3G subnet prefix is registered, the location management unit 133 updates the registration information of the terminal 31. When a new terminal IP address having a subnet prefix for WLAN is registered, the location management unit 133 additionally registers the terminal IP address and the Layer 2 address (MAC address).

  Further, the location management unit 133 performs the same processing as described above even when the terminal 31 is located in the WLAN, and performs update processing when the terminal IP address having the WAN subnet prefix is registered, and the 3G subnet prefix. When a terminal IP address having is registered, additional registration processing is performed. When the location management unit 133 is updated or added, the location management unit 133 notifies the handover control unit 134 of this.

  The handover control unit 134 manages the IP addresses and TCP / UDP port numbers of terminals related to each session. When the location control unit 133 is notified of the update of the location information, the handover control unit 134 transmits the forwarding table update information to the router 11.

  When the addition is notified from the location management unit 133, the handover control unit 134 determines handover. At this time, the handover control unit 134 specifies the application to be used from the TCP / UDP port number information, and determines the necessity of handover. If the handover control unit 134 determines that a handover is necessary, it generates additional forwarding table information, transmits the forwarding table information to the router 11, and terminates the above processing if it is not necessary. In this embodiment, FTP is recognized and a handover process is executed.

  FIG. 6 is a sequence chart showing a handover process according to an embodiment of the present invention. A handover process according to an embodiment of the present invention will be described with reference to FIGS. 1 and 4 to 6.

  When the terminal 31 detects that it is in the WLAN area 201 (a1 in FIG. 6), it notifies the SIP management 13 via the router 11 (a2 in FIG. 6).

  When the SIP management 13 receives a notification of the presence of the WLAN area 201 from the terminal 31, the SIP management 13 executes a handover process (a3 in FIG. 6). In this case, as described above, the SIP management 13 performs a WLAN registration process, a used application identification process, a handover determination process, and a forwarding table information generation process as described above. The SIP management 13 delivers the forwarding table additional information to the router 11 as a result of the handover process (a4 in FIG. 6).

  Upon receiving the forwarding table addition information from the SIP management 13, the router 11 performs a forwarding table update process (a5 in FIG. 6). The router 11 registers the received forwarding table information in the forwarding table 16 as the forwarding table update process.

  Subsequently, the router 11 performs a forwarding process (a6 in FIG. 6). The router 11 starts processing using the updated forwarding table 16 as forwarding processing. As a result, the terminal 31 starts data reception in the WLAN area 201 (a7 in FIG. 6).

  Thus, in this embodiment, in order to allow the user to use various application data flows flowing on the IP network 100 without stress, a certain communication quality is expected for the IP network 100. In the case of a voice service, the bandwidth may be small, but an access method with a wide usable service area is convenient for the user. In the case of data download, broadband access is convenient for the user.

  In this embodiment, since the router 11 performs a handover according to the application data flow, it is possible to provide an optimum access means for each application data flow.

  FIG. 7 is a block diagram showing an internal configuration of a router according to another embodiment of the present invention. 7, another embodiment of the present invention is shown in FIG. 4 except that the router 14 is provided with an IP packet receiving unit 141 having a QoS (Quality of Service) quality collection function 141a instead of the IP packet receiving unit 112. The configuration is the same as that of the router 11 according to the embodiment of the present invention, and the same components are denoted by the same reference numerals. The operation of the same component is the same as that of the embodiment of the present invention.

  The quality of the wireless transmission path changes due to various factors. Therefore, even if the terminal 31 is not moving, the optimal transmission path changes every moment. Therefore, in another embodiment of the present invention, the QoS quality collection function 141a is arranged in the IP packet receiving unit 141, thereby executing a handover for each application.

  The IP packet receiving unit 141 recalculates the TCP / UDP checksum included in the IP packet received from the terminal 31, for example. At this time, the QoS quality collection function 141a statistically collects the number of occurrences of checksum abnormality in units of application flows. The QoS quality collection function 141a makes the collection time constant, and handles the number of occurrences of checksum abnormality within that time as transmission path quality information between the terminal 31 and the router 14.

  Here, the QoS quality collection function 141a sets a threshold for the number of occurrences of checksum abnormality per fixed time of each application. If the terminal 31 transmits / receives data via a plurality of access methods, and the number of checksum anomalies exceeds a threshold, the QoS quality collection function 141a starts handover processing for the application.

  In this handover process, a handover request is notified to the SIP management 13. This handover request includes the terminal IP address of the terminal 31, TCP / UDP port number information, and the MAC address of the terminal.

  When receiving the handover request, the SIP management 13 notifies the router 14 of information related to the data flow to be handed over, as in the above-described embodiment of the present invention. This information includes the terminal IP address of the terminal 31, the TCP / UDP port number, and the MAC address of the terminal.

  In the present embodiment, the number of occurrences of checksum abnormality is handled as transmission path quality information. However, quality information collected by Layer 2 may be used as QoS information. In this case, a certain threshold value is provided, and the router 14 notifies the SIP management 13 of a handover request when the quality notified from the Layer 2 exceeds the threshold value.

  The SIP management 13 specifies a terminal 31 located in the area under the router 14 and its application flow, and determines a handover target. Then, the SIP management 13 performs a handover process similar to that of the above-described embodiment of the present invention.

  As a result, according to the present embodiment, it is possible to provide a handover function capable of always providing an optimum wireless transmission path for each application according to the wireless transmission path quality that changes every moment.

It is a block diagram which shows the structural example of the mobile communication system by embodiment of this invention. It is a figure which shows the structure of the forwarding table used for the forwarding search process by one Example of this invention. It is a flowchart which shows the hand-over process in the router by one Example of this invention. It is a block diagram which shows the internal structure of the router by one Example of this invention. It is a block diagram which shows the internal structure of SIP management by one Example of this invention. It is a sequence chart which shows the hand-over process by one Example of this invention. It is a block diagram which shows the internal structure of the router by the other Example of this invention. It is a block diagram which shows the structure of the conventional mobile communication system.

Explanation of symbols

11, 12, 14 routers
13 SIP management
21 3rd generation mobile base station
22 WLAN base station 22
31, 32 terminals
100 IP network
111 Physical port for reception (# 0)
112, 141 IP packet receiver
113 Forwarding processing unit
114 Transmission physical port (# 0)
115 Physical port for transmission (# 1)
116 Forwarding table
117 Table management department
131 Message receiver
132 Message transmitter
133 Location Management Department
134 Handover controller
141a QoS quality collection function
200 3G area
201 WLAN area
301 Voice flow
302 FTP data flow

Claims (10)

A mobile communication system including a session management device that performs signaling processing between terminals when performing communication between terminals performed wirelessly via an IP (Internet Protocol) device in a network,
The session management device includes means for determining a data flow to be used by an application that is a handover target of each application-specific data flow that operates on the terminal, and the determined application of the handover target Means for notifying the IP device of information relating to the data flow,
The IP device includes means for executing a handover of the data flow for each application in accordance with a notification from the session management device, means for collecting QoS (Quality of Service) service quality information, and the QoS service quality information. A mobile communication system, comprising : means for making a handover request to the session management apparatus when it is detected that the degradation of transmission path quality is equal to or higher than a reference value. A mobile communication system including a session management device that performs signaling processing between terminals when performing communication between terminals performed wirelessly via an IP (Internet Protocol) device in a network,
The terminal includes means for determining a data flow that is a handover target of each application-specific data flow that operates in the terminal, and information that specifies the data flow of the application that is the handover target. Means for notifying the device,
The session management device has means for notifying the IP device of information relating to the data flow of the application to be handed over according to the notification from the terminal,
The IP device includes means for executing a handover of the data flow for each application in accordance with a notification from the session management device, means for collecting QoS (Quality of Service) service quality information, and the QoS service quality information. A mobile communication system, comprising : means for making a handover request to the session management apparatus when it is detected that the degradation of transmission path quality is equal to or higher than a reference value. 3. The mobile communication system according to claim 1, wherein the IP device recognizes a data flow used by the application and performs packet transfer by selecting an optimal transmission path for each data flow unit. 4. . The mobile communication system according to claim 3, wherein the IP device selects one of a plurality of radio base stations each accommodating a different radio access function and performs packet transfer. 3. The mobile communication system according to claim 1, wherein the IP device recognizes a data flow used by the application, and performs packet transfer by selecting an optimum adjacent network for the data flow unit. 4. . A handover method used in a mobile communication system including a session management device that performs signaling processing between the terminals when performing communication between terminals performed wirelessly via an IP (Internet Protocol) device in a network,
The session management device determines a data flow to be used by an application that is a target of handover of each application-specific data flow that operates in the terminal, and the determined application of the handover target Performing information on data flow to the IP device;
The IP device performs a handover of the application-specific data flow according to the notification from the session management device, collects QoS (Quality of Service) service quality information, and the QoS service quality information. And a step of performing a handover request to the session management apparatus when it is detected that the degradation of the transmission path quality is equal to or higher than a reference value. A handover method used in a mobile communication system including a session management device that performs signaling processing between the terminals when performing communication between terminals performed wirelessly via an IP (Internet Protocol) device in a network,
A step in which the terminal determines a data flow that is a handover target of each application-specific data flow that operates in the terminal; and information that specifies the data flow of the application that is the handover target. Performing a step of notifying the device;
The session management device performs a step of notifying the IP device of information related to the data flow of the application to be handed over in accordance with the notification from the terminal,
The IP device performs a handover of the application-specific data flow according to the notification from the session management device, collects QoS (Quality of Service) service quality information, and the QoS service quality information. And a step of performing a handover request to the session management apparatus when it is detected that the degradation of the transmission path quality is equal to or higher than a reference value. The handover method according to claim 6 or 7, wherein the IP device recognizes a data flow used by the application, selects a transmission path optimal for the data flow unit, and performs packet transfer. 9. The handover method according to claim 8, wherein the IP device performs packet transfer by selecting one of a plurality of radio base stations each accommodating a different radio access function. 8. The handover method according to claim 6 or 7, wherein the IP device recognizes a data flow used by the application, selects an adjacent network optimum for the data flow unit, and performs packet transfer.

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