JP2004274458A - Handover control system between different radio systems, edge node and mobile communication terminal used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a handover control system between different radio systems by which seamless handover between the different radio systems is performed. <P>SOLUTION: The handover control system comprises: a plurality of radio access networks 1-3 conducting communication with different radio access modes; a mobile communication terminal 8 having a communication means simultaneously transmitting the same data to the plurality of available radio access networks 1-3 when the mobile communication terminal is located at a position capable of using the plurality of different radio access networks 1-3 and conducts data transmission; and an edge node 6 having a data selection means selecting one of the data in accordance with specified standards out of the same data obtained from the mobile communication terminal received through the different radio access networks to transmit the data to a core network side 4. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a method for automatically controlling a plurality of different wireless access systems, such as various mobile phone systems, a PHS (Personal Handyphone System) system, and a wireless LAN (Local Area Network) system, during a call. The present invention relates to a handover control system between heterogeneous wireless systems capable of switching to another available wireless access system, an edge node used in the system, and a mobile communication terminal device.
[0002]
[Prior art]
At present, with the development of information technology and wireless communication technology, mobile communication terminal devices are widely used. A mobile communication terminal device is a communication terminal device that can perform voice communication by telephone call and information communication such as the Internet and e-mail while moving, without concern for a place, and has a portable size. is there. Examples of such a mobile communication terminal device include a mobile phone, a PHS, a notebook personal computer having a wireless communication function or a wireless LAN function, a PDA (Personal Digital Assistance), and the like.
[0003]
However, there are several types of wireless access systems for performing communication using these mobile communication terminal devices depending on the communication service provider, and the communication systems and communication protocols are different between them. For example, there are a number of wireless access methods such as a CDMA (Code Division Multiple Access) method of a mobile phone, a PDC (Personal Digital Cellular) method, a PHS method of a PHS, and a wireless LAN method of wireless communication. Therefore, the mobile communication terminal device is generally compatible with only one wireless access system provided by a communication carrier, and in most cases, cannot use a communication service using another wireless access system. .
[0004]
Therefore, a method has been proposed in which communication can be performed using any one of the plurality of wireless access methods. For example, Patent Literature 1 discloses a communication mode switching wireless terminal and a communication mode switching method capable of automatically switching a communication mode of a call between a plurality of wireless access modes. FIG. 7 is a diagram for explaining a method of switching communication systems in a plurality of wireless access systems. The system disclosed in Patent Literature 1 includes a base station BS-A that covers a mobile communication terminal device MS corresponding to a communication service of a certain radio access scheme existing in a predetermined range, and a communication system that is the same as the base station BS-A. A mobile gateway exchange MGS-A to which the mobile station belongs, a base station BS-B that covers a mobile communication terminal device MS corresponding to a communication service of a radio access method different from the base station BS-A, and A mobile gateway exchange MGS-B belonging to the same communication system as the station BS-B, a mobile exchange gateway exchange MISGS connecting the mobile gateway exchanges MGS-A and MGS-B, and a mobile exchange gateway exchange MISGS connected. And a fixed network 101. Further, the mobile communication terminal device MS includes a programmable device for performing communication and a plurality of software modules for performing communication using a plurality of wireless access communication services. Incorporating software modules into the programmable device by the service makes it possible to switch communication services.
[0005]
Next, a method of switching the communication method will be described. The case where the mobile communication terminal device MS switches from the wireless access method of the base station BS-A to the wireless access method of the base station BS-B will be described as an example. The mobile communication terminal MS measures the QoS of all currently available communication services and transmits the result to the base station BS-A. The base station BS-A compares the received communication services, and if there is one better than the currently used communication service, reports the result to the mobile gateway exchange MGS-A. The mobile gateway exchange MGS-A checks whether or not the communication service is available. If the communication service is available, the mobile gateway exchange MGS-A transmits a system switching request to the mobile communication system gateway exchange MISGS to the communication service. The mobile communication system gateway switch MISGS connects to the base station BS-B accommodating the mobile communication terminal MS among the base stations connected to the mobile gateway switch MGS-B. Communication from B to the mobile communication terminal MS is enabled. Then, in the mobile communication terminal device MS, the programmable device is switched so that the communication service of the base station BS-B can be used, and the communication service is switched.
[0006]
[Patent Document 1]
JP-A-2002-54168 (pages 5 to 8, FIGS. 1 and 2)
[0007]
[Problems to be solved by the invention]
However, in the conventional communication method switching method, when performing a handover between different systems, the mobile communication terminal device MS that measures the communication quality QoS of all communication services, the base station BS- that determines the magnitude relationship of the communication quality QoS. If there is a communication service having a communication quality better than the current communication quality due to the magnitude relationship between A, BS-B and communication quality QoS, the mobile gateway exchange MGS-A performs an inquiry work for switching to the communication service. , MGS-B, and MISGS between mobile communication systems that switch between the mobile gateway exchanges MGS-A and MGS-B when communication services can be switched, and MISGS between mobile communication systems from the mobile communication terminal MS. Various roles are assigned to many devices on the route, and the system configuration There is a problem that becomes coarse.
[0008]
The present invention has been made in view of the above, and reduces the load on devices existing on a path from a mobile communication terminal device to a node connected to a fixed network when switching communication services, thereby achieving wireless communication. Obtaining a handover control system between heterogeneous radio systems for realizing seamless handover between different radio systems in which the role of each device for realizing communication is simplified, an edge node and a mobile communication terminal device used in the system With the goal.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a handover control system between heterogeneous wireless systems according to the present invention includes a plurality of wireless access networks performing communication using different wireless access methods, and an edge node connecting these wireless access networks and a core network. A handover control system between heterogeneous wireless systems that switches communication data from the mobile communication terminal devices present in the wireless access network by the plurality of different wireless access methods and transmits the communication data to the core network side, The mobile communication terminal device includes a communication unit that simultaneously transmits the same data to a plurality of available wireless access networks when transmitting data at a position where a plurality of different wireless access networks can be used. The edge no Means for selecting any one of the same data received from the mobile communication terminal device via different radio access networks according to a predetermined criterion and transmitting the selected data to the core network side It is characterized by having.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of a handover control system between heterogeneous wireless systems, an edge node used in the system, and a mobile communication terminal according to the present invention will be described in detail below with reference to the accompanying drawings.
[0011]
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of a handover control system between heterogeneous wireless systems according to the present invention. FIG. 1 shows an example of a handover control system between different types of wireless systems when three different types of wireless access systems exist. Therefore, in this system, first to third wireless access networks 1 to 3 each having a different wireless access method, these first to third wireless access networks 1 to 3 and a fixed telephone network or another mobile telephone network. 1 for selecting which data among the data received from the wireless access networks 1 to 3 is to be transmitted to the core network 4 side. And two edge nodes 6. That is, the plurality of wireless access networks 1 to 3 are accommodated in the core network 4 via one edge node 6. Although not shown, the core network 4 is configured to include an exchange for connecting a line, a home register for managing user data on the mobile communication terminal device, and the like.
[0012]
The three types of communication systems of different wireless access systems are, for example, communication systems of different wireless access systems operated by different communication carriers. In the case of FIG. 1, a CDMA communication system is applied as the first wireless access network 1, a wireless LAN communication system is applied as the second wireless access network 2, and a third wireless access network 2 is provided. It is assumed that a PHS communication system is applied as the network 3.
[0013]
In the CDMA communication system, which is the first radio access network 1, a CDMA mobile communication system that performs wireless communication with the mobile communication terminal device 7 in a predetermined area (CDMA mobile phone base station area) 12 with the mobile communication terminal device 7 is provided. The CDMA radio network controller 10 includes a telephone base station 11 and a CDMA radio network controller 10 that manages a plurality of CDMA mobile phone base stations 11. The CDMA radio network controller 10 is connected to the edge node 6. In the CDMA system, since the mobile communication terminal device 7 always communicates with a plurality of CDMA mobile phone base stations 11, the CDMA wireless network control device 10 transmits data received through the plurality of CDMA mobile phone base stations 11. , The higher quality is selectively synthesized and transmitted to the edge node 6.
[0014]
In the communication system of the wireless LAN system, which is the second wireless access network 2, a wireless communication system which performs wireless communication with the mobile communication terminal device 7 in a predetermined area (wireless LAN base station area) 21 by the wireless LAN system. The wireless LAN base station 20 is connected to the edge node 6.
[0015]
In the PHS communication system that is the third wireless access network 3, the PHS base station 30 that performs wireless communication with the mobile communication terminal device 7 in the PHS system within a predetermined area (PHS base station area) 31. The PHS base station 30 is connected to the edge node 6.
[0016]
Each of the base stations or the radio network controllers in the first to third radio access networks 1 to 3 is, specifically, a CDMA radio network controller 10 in the case of the CDMA system and a wireless LAN system and a PHS system. In this case, the wireless LAN base station 20 and the PHS base station 30 also have a function of adding quality information indicating the quality to the uplink data 8 transmitted from the mobile communication terminal device 7.
[0017]
The edge node 6 compares the quality of the same data transmitted from the same mobile communication terminal device 7 transmitted from all or any combination of the CDMA wireless network control device 10, the wireless LAN base station 20, and the PHS base station 30. It has a role of examining and transferring the highest quality data to the core network 4 side. FIG. 2 is a schematic diagram showing a schematic configuration of the edge node. The edge node 6 includes a first communication unit 61 that receives data transmitted from the mobile communication terminal device 7 from each of the plurality of radio access networks 1 to 3, a data storage unit 62 that stores the received data, A data quality storage unit 63 for storing the quality of data received on each path, and data received from a high quality path based on the quality information stored in the data quality storage unit 63 are selected from the data storage unit 62. It is configured to include a data selection unit 64 and a second communication unit 65 that sends the selected data to the core network 4 side.
[0018]
The data storage unit 62 temporarily stores the uplink data 8 received from each of the first to third wireless access networks 1 to 3. The data quality storage unit 63 classifies and manages quality information on the same uplink data 8 for each of the wireless access networks 1 to 3 that have passed therethrough. For example, if quality information is managed for each identical mobile communication terminal device 7, it becomes easier to determine quality. The data selection unit 64 selects one of the highest quality data or data to be transmitted to the core network 4 according to a predetermined standard based on the quality information of the data stored in the data quality storage unit 63, and selects the data. The data is transmitted from the data storage unit 62 to the core network 4. Bit error rate, frame error rate, packet error rate, device resource, power consumption, communication fee, sound quality, transmission rate, reception level, and the like can be used as parameters as quality information serving as data selection criteria.
[0019]
FIG. 3 is a schematic diagram for explaining a communication mechanism of a mobile communication terminal device used in this system. The mobile communication terminal device 7 used in this system is a multi-mode terminal capable of communicating by a plurality of wireless access methods. For example, in the case of the mobile communication terminal device 7 used in the system of FIG. 1, it is configured to be able to communicate with all of the CDMA system, the wireless LAN system, and the PHS system. It has a data generation unit 71 for generating data to be transmitted in a format corresponding to each wireless access system, and first to third communication units 72a to 72c for transmitting and receiving data in each wireless access system. . The mobile communication terminal device 7 has the same configuration as a mobile communication terminal device such as a commonly used mobile phone, and transmits signals transmitted at predetermined intervals from the base stations 11, 20, and 30 of the respective wireless access systems. Receives and detects available wireless access methods. For example, when a call is made when the mobile communication terminal device 7 is located in a place where the above three types of wireless access methods can be used, voice data is in all formats of the CDMA method, the wireless LAN method, and the PHS method. Are transmitted from the respective communication units. When only any two types of wireless access methods can be used, data of the two types of wireless access methods is transmitted from the respective communication units.
[0020]
In addition, the data generation unit 71 is configured such that uplink data such as audio data generated by the mobile communication terminal device 7 includes user data for storing the audio data and header information such as a transmission destination and a transmission source regarding the user data. If the user data is transmitted, a terminal ID for identifying the own mobile communication terminal device 7 or a channel identification ID indicating which mobile communication terminal device 7 is to be transmitted using which wireless access method is used. With a sequence number for identifying the data to be transmitted. For example, when the same data is transmitted in the CDMA wireless access network 1 and the wireless LAN wireless access network 2, the sequence number is the same for the data. Note that the data generation unit 71 may add quality information indicating the quality of data to be transmitted.
[0021]
Here, an operation of the handover control system during communication of the mobile communication terminal device 7 will be described. First, the mobile communication terminal device 7 detects available wireless access networks 1 to 3. In this description, as shown in FIG. 1, mobile communication terminal device 7 uses a CDMA wireless network (first wireless network) 1 and a wireless LAN wireless network (second wireless network) 2. And a connection has been established with another communication terminal device (hereinafter, referred to as a communication partner) not shown.
[0022]
Next, data such as voice data to be transmitted to the communication partner is generated by the data generation unit 71 of the mobile communication terminal device 7. FIG. 4 is a diagram illustrating a format of uplink data, and FIG. 4A is a diagram illustrating a format of uplink data generated by a data generation unit of the mobile communication terminal device. The format of the uplink data 8 is composed of user data 80 for storing data such as voice data from a call, and header information 81 for storing information on the user data 80 such as a transmission destination. Further, as shown in FIG. 4 (b), the data generation unit 71 transmits the data used in each of the available wireless access networks 1 to 3 to its own mobile communication terminal device 7 as shown in FIG. A process is performed to add a terminal ID for identifying a channel or a channel identification ID 82 for identifying a channel for transmitting data and a sequence number 83 continuously assigned to data to be transmitted. The uplink data 8 to which the terminal ID or the channel identification ID 82 and the sequence number 83 are added are transmitted from the respective communication units 72a to 72c. In this case, data of the CDMA system is transmitted from the first communication unit 72a, and data of the wireless LAN system is transmitted from the second communication unit 72b.
[0023]
Next, when the CDMA mobile phone base station 11 receives the data 8 from the mobile communication terminal device 7, it sends the data 8 to the CDMA radio network controller 10 as it is. Although not shown in FIG. 1, in the case of the CDMA system, a plurality of CDMA mobile phone base stations 11 receive data 8 from the mobile communication terminal device 7 and each of the CDMA mobile phone base stations 11 Sends the received data 7 to the CDMA radio network controller 10. The CDMA radio network controller 10 performs selective combining for selecting data having the highest reliability information from among the data 8 received from the plurality of CDMA mobile phone base stations 11. Then, quality information 84 indicating the quality of the data is added to the data on which the selective combination has been performed, as shown in FIG. The data transmission path in the CDMA system is referred to as a first path.
[0024]
On the other hand, when receiving the data 8 from the mobile communication terminal device 7, the wireless LAN base station 20 adds quality information 84 indicating the data quality to the received data 8, as shown in FIG. To the edge node 6. The data transmission path in the wireless LAN system is referred to as a second path.
[0025]
Thereafter, the edge node 6 receives the data 8 having the same contents from the CDMA radio network controller 10 and the wireless LAN base station 20, and stores the data 8 and the quality information of the data 8 in the data storage unit 62 and the data quality storage unit, respectively. 63 temporarily. FIG. 5 is a diagram schematically illustrating how data is selected at the edge node. As described above, the edge node 6 is configured to buffer data for each data having the same terminal ID. Then, for the data having the same terminal ID, the quality of the data transmitted through a plurality of routes is extracted from the data and arranged in order for each sequence number.
[0026]
For example, in the case of FIG. 5, the quality of the data transmitted from the mobile communication terminal device 7 identified by the sequence number “SN0” via the first route in FIG. 1 is poor (in the figure, “ NG), and the quality of the data that has passed through the second route is good (shown as “OK” in the figure). In this case, assuming that the data selection unit 64 selects the data based on the quality, the data selection unit 64 selects the data that has passed through the high quality second route as the data to be transmitted to the core network 4 side, and Is extracted from the data storage unit 62 and transmitted from the second communication unit 65 to the core network 4. Such processing is executed for each data of the received sequence number.
[0027]
In the above description, the case where the data selection unit 64 of the edge node 6 performs the comparison using the quality information 84 has been described. However, in some cases, the data may not be received by the edge node 6. Selects data to be transmitted to the core network 4 depending on the presence or absence of data. For example, in the sequence number "SN4" in FIG. 5, data that has passed through the second route has not been received (in the figure, it is indicated as "reception NG"). The data selector 64 has selected the data that has passed through the first route that has received the data.
[0028]
If the data selection unit 64 of the edge node 6 can receive sufficiently reliable data from the plurality of wireless access networks 1 to 3, for example, if the quality information 84 is equivalent on a plurality of routes, , Or a route set in advance by the user of the mobile communication terminal device 7 or the communication carrier. For example, as shown by the sequence number “SN2” in FIG. 5, when both routes have the same communication quality, the one with the lower cost or the user or the carrier of the mobile communication terminal device 7 sets in advance. The data that has passed through the second route is selected by the data selection unit 64 according to the reference. As described above, when a plurality of data having the same content that have passed through different wireless access networks 1 to 3 have the same quality, the cost or the user or the operator of the mobile communication terminal device 7 is determined from among them. Therefore, there is an effect that seamless handover between heterogeneous wireless access communication systems can be realized in accordance with the cost or the policy of the user or the operator of the mobile communication terminal device 7.
[0029]
Further, in FIG. 2, the data storage unit 62 and the data quality storage unit 63 are configured to store data and their quality information separately, but it is possible to compare the quality information of the same data that has passed through different routes. If the data can be identified, they may be stored together.
[0030]
Note that the downlink data can be transmitted from the core network 4 to the mobile communication terminal 7 via an arbitrary route. For example, the route selected when sending the upstream data 8 to the core network 4 may be used, and the route with the lowest communication fee may be used for the downstream data.
[0031]
According to the first embodiment, the edge node 6 holds data for each path via different base stations, for each terminal ID or channel identification ID, and for the sequence number, and assigns the sequence number assigned to each data. In this case, one highly reliable data is selected according to the presence or absence of the received data or the quality information 84 and is transferred to the core network 4. A wireless access network that transmits data seamlessly between the wireless access networks can be switched.
[0032]
Embodiment 2 FIG.
In the first embodiment described above, the case where a plurality of wireless access networks 1 to 3 are accommodated in the same edge node 6 has been described. In the second embodiment, however, an edge node in which a plurality of wireless access networks are accommodated In the following, a description will be given of a handover control system between different types of wireless systems in which the wireless communication systems are different.
[0033]
FIG. 6 is a block diagram showing a schematic configuration of a second embodiment of a handover control system between heterogeneous wireless systems according to the present invention. In FIG. 6, as in the case of FIG. 1, a handover control system between heterogeneous wireless systems in a case where communication systems of three different types of wireless access systems exist is taken as an example. In FIG. 6, first to third wireless access networks 1 to 3 having different wireless access systems, a first edge node 6 a provided between the first wireless access network 1 and the core network 4, A second edge node 6b provided between the second and third wireless access networks 2 and 3 and the core network 4 is provided. That is, the first radio access network 1 is accommodated in the core network 4 via the first edge node 6a, and the second and third radio access networks 2, 3 are accommodated in the core network via the second edge node 6b. 4.
[0034]
Here, the second edge node 6b has a function of transferring the data 8 received from the second wireless access network 2 and the data 8 received from the third wireless access network 3 to the first edge node 6a as they are. Have. That is, the second edge node 6b does not execute the function of selecting data performed by the edge node 6 of FIG. 1 of the first embodiment. On the other hand, the first edge node 6a transmits the data 8 received from the first network 1 and the second and third radio access networks 2 and 3 transferred from the second edge node 6b. The received data 8 is received and buffered, and the data is transmitted to the core network 4 based on the presence or absence of the data or the quality information. That is, the first edge node 6a has the same function as the edge node 6 in FIG. 1 of the first embodiment. Note that the same components as those in FIG. 1 are denoted by the same reference numerals as in FIG. 1 and description thereof is omitted.
[0035]
In the operation of this system, the route through which the data transmitted from the mobile communication terminal device 7 travels is the same, but the data via the second and third radio access networks is transmitted to the second edge node 6b. , The only difference is that the data is further transferred to the first edge node 6a. Subsequent data selection processing in the first edge node 6a is the same as in the first embodiment, and a description thereof will be omitted.
[0036]
According to the second embodiment, even when a plurality of communication systems of the radio access scheme are accommodated in different edge nodes 6a and 6b, data from the mobile communication terminal device 7 is collected in one of the edge nodes 6a, The configuration is such that one highly reliable data is selected and transferred to the core network 4 depending on the presence or absence of the data received at the edge node 6a or the communication quality of the data. There is an effect that a seamless handover can be realized.
[0037]
In the description of the first and second embodiments, the CDMA system, the wireless LAN system, and the PHS system are exemplified as the communication system of the wireless access system, but other communication systems such as the PDC system may be used. A similar handover control system between different types of wireless systems can be constructed.
[0038]
【The invention's effect】
As described above, according to the present invention, highly reliable data is selected and transmitted from a plurality of data having the same content transmitted via different wireless networks. This has the effect that a seamless handover between them can be realized. Further, since the processing in the base station or the radio network control device in the middle of the route merely adds the quality information to the data and transfers the data, the load on these devices can be suppressed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of a handover control system between heterogeneous wireless systems according to the present invention.
FIG. 2 is a schematic diagram showing a schematic configuration of an edge node.
FIG. 3 is a block diagram illustrating a schematic configuration of a mobile communication terminal device.
4A and 4B are diagrams illustrating a data format, wherein FIG. 4A shows a format of data generated by a data generation unit of the mobile communication terminal device, and FIG. 4B shows a terminal ID or a channel identification ID; The format of the data with the number added is shown, and (c) shows the format of the data with the quality information added.
FIG. 5 is a diagram schematically illustrating how data is selected at an edge node.
FIG. 6 is a block diagram showing a schematic configuration of a second embodiment of a handover control system between heterogeneous wireless systems according to the present invention.
FIG. 7 is a diagram showing a conventional example of a communication method switching method in a plurality of wireless access methods.
[Explanation of symbols]
1-3 radio access network, 4 core network, 5 other networks, 6, 6a, 6b edge node, 7 mobile communication terminal, 8 uplink data, 10 CDMA radio network controller, 11 CDMA mobile phone base station, 12 CDMA Cellular phone base station area, 20 wireless LAN base station, 21 wireless LAN base station area, 30 PHS base station, 31 PHS base station area, 61, 65, 72a-72c communication section, 62 data storage section, 63 data quality storage section , 64 data selector, 71 data generator, 80 user data, 81 header information, 82 terminal ID or channel identification ID, 83 sequence number, 84
quality information.

Claims (13)

A plurality of radio access networks that perform communication using different radio access methods, and an edge node that connects these radio access networks and a core network; and the plurality of different radio communication networks from mobile communication terminal devices existing in the radio access network. A handover control system between heterogeneous wireless systems for switching communication data by a wireless access method and transmitting the data to the core network side,
Communication means for simultaneously transmitting the same data to a plurality of available radio access networks when the mobile communication terminal apparatus is located at a position where a plurality of different radio access networks can be used and transmits data; With
The edge node selects any one of the same data received from the mobile communication terminal device via the different radio access networks according to a predetermined criterion, and sends the selected data to the core network side. A handover control system between heterogeneous wireless systems, comprising a data selection unit. 2. The handover control system according to claim 1, wherein the data selection unit of the edge node selects data depending on whether the same data is received from different radio access networks. The mobile communication terminal device transmits, for the data, a terminal identification number for identifying the mobile communication terminal device or a channel identification number for identifying a transmission channel, and a sequence for identifying the data. Further comprising data generation means for adding a number,
A node connected to the edge node in the radio access network, further comprising means for adding quality information indicating the quality of the data to the data from the mobile communication terminal device;
The heterogeneous radio according to claim 1 or 2, wherein the data selection means of the edge node selects data having good quality information from the same data received via different radio access networks. Handover control system between systems. The system according to claim 3, wherein the data generation means of the mobile communication terminal device further adds quality information indicating the quality of the data to be transmitted. 5. The data selecting means of the edge node according to claim 3, wherein, when quality information of the same data received from the different radio access networks is equal, the data having a lower communication cost is selected. A system for controlling handover between heterogeneous wireless systems according to claim 1. When there are a plurality of edge nodes connecting the radio access network and the core network, only one of the edge nodes has the data selection means, and the other edge nodes have the edge The heterogeneous radio according to any one of claims 1 to 5, further comprising data transfer means for transferring data received from a radio access network connected to the node to an edge node having the data selection means. Handover control system between systems. A mobile communication system in which a plurality of radio access networks communicating with different radio access methods are accommodated via an edge node in a core network for connecting to another network, and mobile communication capable of communicating with the plurality of radio access networks simultaneously An edge node used for a handover control system between heterogeneous wireless systems that switches communication data from the communication terminal device according to the plurality of different wireless access schemes and transmits the communication data to the core network side,
Data selecting means for selecting any one of the same data received from the mobile communication terminal device via the different radio access networks according to a predetermined criterion and transmitting the selected data to the core network side An edge node, characterized in that: The edge node according to claim 7, wherein the data selection unit selects data depending on whether or not the same data has been received from a different radio access network. The data includes a terminal identification number for identifying the mobile communication terminal device or a channel identification number for identifying a transmission channel, a sequence number for identifying the data, and a quality indicating the quality of the data. With information,
9. The edge node according to claim 7, wherein the data selection unit selects data having good quality information from the same data received via different wireless access networks. 10. 10. The edge node according to claim 9, wherein the data selection unit selects the data with the lower cost when the quality information of the same data received from the different radio access networks is equal. A mobile communication system in which a plurality of radio access networks communicating with different radio access methods are accommodated via an edge node in a core network for connecting to another network, and mobile communication capable of communicating with the plurality of radio access networks simultaneously A mobile communication terminal device used in a handover control system between heterogeneous wireless systems that switches communication data according to the plurality of different wireless access methods from a communication terminal device and transmits the data to the core network side,
When the data transmission is performed at a position where the plurality of different radio access networks can be used, communication means for simultaneously transmitting the same data to the plurality of radio access networks is provided. Communication terminal device. Data generation means for adding, to the data to be transmitted, a terminal identification number for identifying the mobile communication terminal device or a channel identification number for identifying a channel to be transmitted, and a sequence number for identifying the data The mobile communication terminal device according to claim 11, further comprising: 13. The mobile communication terminal device according to claim 12, wherein the data generation unit further adds quality information indicating the quality of the data to be transmitted.

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