JP2021068923A - Forwarding control system, network side device, and location management device - Google Patents

Abstract

To provide a forwarding control system, a network side device, and a location management device that ensure that a packet is delivered to a mobile communication terminal with a shortened travel distance of the packet in a mobile communication network.SOLUTION: A forwarding control system 1 comprises: an SMF 10 included in a mobile communication network N; and a mapping system 20 that is provided outside of the mobile communication network N and included in a forwarding system 80 for forwarding packets. The SMF 10 comprises: a detection unit that detects a change of mapping of a UE and a UPF having a session with the UE; and a network side notification unit that notifies the mapping system 20 of the detected change. The mapping system 20 comprises : a notification reception unit that receives the notification of the change from the SMF10; and a forwarding system side notification unit that notifies an xTR 90 of the forwarding system 80 of information that indicates mapping of the UE and the UPF according to the notification and is to be used for packet forwarding.SELECTED DRAWING: Figure 1

Description

The present invention relates to a transfer control system, a network side device, and a position management device related to packet transfer in a mobile communication network.

In the 5th generation mobile communication system (5G), communication is performed by relaying packets by UPF (User Plane Function), which is a plurality of relay devices provided in the core network. In a 5G mobile communication network, when a UE (User Equipment, mobile communication terminal) communicates with another device, a packet is usually output to a DN (data network), which is a network outside the core network. Is done. That is, a session about the UE is provided in the UPF provided between the UE and the DN.

In 5G, depending on the destination address of the uplink packet (uplink packet), the packet is sent to an UPF different from the UPF designated as a normal forwarding destination or an LDN (local DN) which is a regionally distributed external network. UL CL (Uplink Classifier) for transfer is specified (see, for example, Non-Patent Document 1). UL CL is set for each UPF. When a packet addressed to a UE of a mobile communication network is transmitted from a UE of the mobile communication network to another UE of the mobile communication network by setting a UL CL to be transferred from the UPF to the nearest LDN. , LDN can be used to return the communication. If the communication is returned by the LDN, the moving distance of the packet can be shortened, that is, the communication can be optimized as compared with the case where the communication is returned by the DN.

On the other hand, the IETF (Internet Engineering Task Force) defines LISP (Locator / Identifier Separation Protocol). In LISP, the position of each UE is managed as map information, and packets are transferred according to the position of each UE. That is, in LISP, the packet is transferred by the xTR provided according to the position, and the packet is transferred depending on which xTR the UE is under (for example, Non-Patent Document 2).

3GPP 23.501 V15.0.0 IETF RFC6830 The Locator / ID Separation Protocol (LISP)

In the above-mentioned method using UL CL simply, if the UEs communicating with each other are not under the same UPF and the looped UPF does not have a session of the UE to which the packet is destined, the packet is sent. Cannot reach the destination UE (packet loss).

The above problem can be solved by using LISP. LISP is realized by a system including a mapping system provided outside the mobile communication network and xTR. The mapping system manages the map information and notifies the xTR of the map information. For example, the xTR forwards a packet transmitted from the UPF to the LDN so as to reach the LDN corresponding to the UE of the destination of the packet. The xTR forwarding can cause the packet to reach the UPF where the destination UE session is provided.

The map information managed by the mapping system is based on packets transmitted from the UE and arriving at xTR. Therefore, even if the UE moves and is under the control of a different UPF, the map information is not updated unless the packet is transmitted from the UE. In this case, when a packet destined for this UE is transmitted, the packet may not be forwarded properly and the packet may not reach the destination UE.

The present invention has been made in view of the above, and in a mobile communication network, a transfer control system, a network-side device, and a transfer control system capable of reliably delivering a packet to a mobile communication terminal after shortening the movement distance of the packet. It is an object of the present invention to provide a position management device.

In order to achieve the above object, the transfer control system according to the present invention is provided outside the mobile communication network and the network side device included in the mobile communication network, and from the mobile communication network to the external network. It is a transfer control system including a position management device included in a transfer system that transfers transmitted packets, and the network side device is a communication between a mobile communication terminal located in a mobile communication network and the mobile communication terminal. The location management device includes a detection unit that detects that the association with the relay device on the route has changed, and a network-side notification unit that notifies the position management device of the change detected by the detection unit. Information according to the correspondence between the mobile communication terminal and the relay device on the communication path of the mobile communication terminal based on the notification received by the notification receiving unit and the notification receiving unit that receives the notification of the change from the device is sent to the packet. It includes a transfer system side notification unit that notifies a transfer device included in the transfer system as information used for transfer.

In the transfer control system according to the present invention, the network-side device detects a change in the association between the mobile communication terminal and the relay device on the communication path of the mobile communication terminal, and notifies the position management device of the transfer system. .. In the transfer system, the information according to the correspondence based on the notification is notified from the position management device to the transfer device as the information used for packet transfer. Therefore, in the transfer system, it is possible to appropriately grasp the transfer destination of the packet regardless of the packet transmitted from the mobile communication terminal to the transfer system. Therefore, according to the transfer control system according to the present invention, in the mobile communication network, it is possible to reliably deliver the packet to the mobile communication terminal after shortening the moving distance of the packet. Further, the network side device and the position management device included in the above transfer control system have a novel configuration themselves and correspond to the invention.

According to the present invention, in the transfer system, the transfer destination of the packet can be appropriately grasped regardless of the packet transmitted from the mobile communication terminal to the transfer system, and the movement distance of the packet is shortened in the mobile communication network. After that, the packet can be reliably delivered to the mobile communication terminal.

It is a figure which shows the structure of the transfer control system which concerns on embodiment of this invention. It is a figure which shows the route table which is stored in the router of DN or LDN. It is a figure which shows UL CL set in UPF. It is a figure which shows the functional structure of the SMF and the mapping system included in the transfer control system which concerns on embodiment of this invention. It is a sequence diagram which shows the process executed by the transfer control system which concerns on embodiment of this invention. It is a figure which shows the hardware configuration of the SMF and the mapping system included in the transfer control system which concerns on embodiment of this invention.

Hereinafter, embodiments of the transfer control system, the network side device, and the position management device according to the present invention will be described in detail together with the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 shows a transfer control system 1 according to the present embodiment. The transfer control system 1 includes an SMF (Session Management Function) 10 which is a network-side device according to the present embodiment and a mapping system 20 which is a position management device according to the present embodiment. The transfer control system 1 is a system that controls the transfer of packets transmitted from the UE 30 to the mobile communication network N.

The mobile communication network N is a communication network that provides the UE 30 with a mobile communication function. The mobile communication network N according to the present embodiment is, for example, a 5G mobile communication network. However, it does not necessarily have to be a 5G mobile communication network, and any mobile communication network having a framework conforming to the present embodiment may be used.

The mobile communication network N includes an SMF 10 and a plurality of UPF 40s as components of the core network. The mobile communication network N includes a plurality of gNBs (gNodeBs) 50 as a configuration of a radio access network. The nodes of the mobile communication network N such as SMF10, UPF40, and gNB50 may be realized by a virtual server operating in a virtual machine realized on a physical server which is a network infrastructure of the mobile communication network N. The mobile communication network N may include devices, nodes, and the like included in a normal mobile communication network other than the above.

The SMF 10 is a node that manages sessions in the mobile communication network N. The UPF 40 is a relay device that relays user data, which is a packet transmitted / received by the UE 30 in the mobile communication network N. The UPF 40 is connected to another UPF 40 set in advance, and transmits / receives a packet to / from another connected UPF 40 or the like to relay the packet. The gNB 50 is a node having a function of a base station. The gNB 50 is connected to one of the plurality of UPF 40s, and relays packets transmitted and received by the UE 30 under its own control to the UPF 40. The UPF40 and gNB50 are usually provided at each position of the communication area of the mobile communication network N. Packets sent and received by the UE 30 are relayed by the gNB 50 near the position of the UE 30 and the UPF 40 connected to the gNB 50.

One of the plurality of UPF 40s (“UPF 0” in FIG. 1) is connected to a DN (data network) 60 which is an external network outside the mobile communication network N. When the UE 30 transmits a packet via the mobile communication network N, the packet is once transmitted from the mobile communication network N to the DN60. Therefore, in the mobile communication network N, a session including a communication path related to the UE 30 is generated between the UE 30 and the DN 60. When the UE 30 is in the mobile communication network N, the SMF 10 generates the session. The session is set up on UPF40. Specifically, session information related to the session is generated in the UPF 40 that constitutes the session. For example, in the example of FIG. 1, the session of "UE1" up to DN60 goes through the gNB50 under which "UE1" is placed, "UPF1" connected to the gNB50, and "UPF0" connected to "UPF1". Is generated. The packet from "UE1" is transmitted to DN60 and the packet to "UE1" is transmitted from DN60 via UPF40 having this session. That is, in the mobile communication network N, tree-based routing is performed with "UPF0" connected to the DN60 as an anchor.

When a packet is transmitted / received between UEs 30 located in the mobile communication network N, the packet (communication) is returned at DN60. Specifically, packet wrapping is performed as follows. The router (not shown) included in the DN 60 stores the information of the route table shown in FIG. 2 in advance. The route table associates the destination of the packet with the next hop, which is information indicating the node to which the router next transmits the packet. The destination is, for example, the IP address of the UE 30 of the destination of the packet, or a subnet address indicating the range of the IP address. The next hop is the IP address of the above node.

For example, the DN60 router shown in FIG. 1 stores the route table shown in FIG. 2 (a). The route table shown in FIG. 2A shows that a packet addressed to an arbitrary UE 30 located in the mobile communication network N is transmitted to "UPF0". The router of DN60 receives the packet from the mobile communication network N from "UPF0" and transmits it according to the route table. Therefore, the router of DN60 transmits a packet destined for any UE 30 in the mobile communication network N to "UPF0" according to the route table. Note that packets destined for destinations other than the UE 30 located in the mobile communication network N are not returned as described above, but are transferred to another network or the like according to the destination.

As described above, since the UPF 40 is usually provided for each communication area of the mobile communication network N, when the packet is transmitted to the DN 60 and folded back, the moving distance of the packet may become long. The UL CL described above is used to shorten the movement distance of the packet. The UL CL causes the UPF 40 to transmit a packet satisfying a certain condition to a transfer destination different from the communication path described in the session (that is, a transfer destination different from the UPF 40 or the like designated as a normal transfer destination). Is for. For example, it is for transmitting a packet destined for another UE 30 located in the mobile communication network N to the LDN (local DN) 70, which is a regionally distributed external network, instead of the direction toward the DN 60.

UL CL is information in which rules for forwarding packets are described. For example, as shown in FIG. 3, the UL CL associates a packet destination with a next hop, which is information indicating a node to which the UPF 40 next transmits the packet. The destination is, for example, the IP address of the UE 30 of the destination of the packet, or a subnet address indicating the range of the IP address. The next hop is the IP address of the above node.

UL CL is set to UPF40 having a session of the UE30 for each UE30. For example, it is set to UPF40 (UPF40 connected to gNB50) closest to gNB50 in the communication path formed by the session. In the case of the session of "UE1" shown in FIG. 1, UL CL for transmitting a packet addressed to an arbitrary UE30 located in the mobile communication network N to "LDN1" is set in "UPF1". When forwarding a packet, UL CL takes precedence over session. That is, when the received packet meets the conditions set in UL CL, the UPF 40 transmits the packet to the destination set in UL CL instead of the destination specified by the session. The setting of UL CL is also performed by SMF10 when setting the session.

In the LDN 70 to which the packet is transmitted, the route table is stored in the router as in the DN 60, and the packet is transferred according to the route table. In the LDN 70 as well, the packets between the UEs 30 located in the mobile communication network N are returned as in the DN 60. For example, the router of "LDN1" connected to "UPF1" stores the route table shown in FIG. 2B in advance, and the packet is returned according to the route table. As described above, the movement distance of the packet can be shortened by returning the packet by the LDN 70 instead of the DN 60.

However, if the UPF 40 in which the packet is returned from the LDN 70 is not provided with the session related to the UE 30 at the destination of the packet, the mobile communication network N cannot transmit the packet to the UE 30 (packet loss). For example, when the "UE1" under "UPF1" shown in FIG. 1 transmits a packet to "UE2" under "UPF2", the packet is returned from "LDN1" to "UPF1". The session related to "UE2" is set on UPF40 leading to "UPF0" connected to DN60 via "UPF2". If there is no "UPF1" on the communication path formed by the session related to the "UE2", the mobile communication network N cannot transmit the packet to the "UE2".

To deal with this, LISP specified in the IETF can be used. In LISP, a transfer system 80 is used that is provided outside the mobile communication network N and that transfers packets transmitted from the mobile communication network N to the external network. The transfer system 80 includes a mapping system 20 and a plurality of xTR90s. The mapping system 20 is a position management device that acquires map information of the UE 30. The mapping system 20 is connected to each xTR90 so that information can be transmitted and received, and notifies each xTR90 of the acquired map information. The map information is information in which the terminal ID, which is the identifier of the UE 30, and the position ID, which is the identifier of the UE 30 position, are associated with each other. The terminal ID is, for example, the IP address of the UE 30. The position ID is the IP address of xTR90 corresponding to the UE 30.

The xTR90 is a transfer device that transfers packets. The xTR90 is provided between each LDN 70 and the UPF 40 that transmits a packet to the LDN 70 by UL CL. That is, the xTR90 is connected to the UPF40 and LDN70 preset for each xTR90, and a plurality of xTR90s are provided according to the UPF40. Further, each xTR90 is connected, and the xTR90 can send and receive information to and from another xTR90. The xTR90 may also be provided between the "UPF0" and the DN60. The xTR90 corresponding to the UE 30 indicated by the position ID of the map information is based on the UPF 40 (UPF 40 closest to the UE 30 on the communication path formed by the session of the UE 30) and the UPF 40 based on the UL CL. This is an xTR90 provided between the LDN 70 and the packet transfer destination. Normally, UPF40 and xTR90 are provided at physically close positions. That is, the xTR90 corresponding to the UE 30 indicated by the position ID of the map information is the xTR90 corresponding to the position of the UE 30.

The xTR90 receives notification of map information from the mapping system 20, stores the map information, and uses it for controlling packet transfer. The storage of map information may be cached for a certain period of time. That is, the map information about the UE 30 that has not relayed the packet for a certain period of time may be deleted. The xTR90 receives a packet transmitted from the UPF40 to the LDN70 by the UL CL. The xTR90 refers to the destination of the received packet. The xTR90 refers to the position ID of the destination UE 30 of the received packet from the map information stored by itself.

When the xTR90 indicated by the position ID is 90, the xTR90 returns a packet to the UPF40 connected to the 90. Since the UPF 40 is provided with a session of the UE 30 of the destination of the packet, the packet is transmitted to the UE 30 of the destination.

On the other hand, if the xTR90 indicated by the position ID is not 90, the xTR90 transmits a packet to the xTR90 indicated by the position ID. When the xTR90 receives a packet from another xTR90, the xTR90 returns the packet to the UPF40 connected to itself (the UE30 at the destination of the packet is placed under it). Since the UPF 40 is provided with a session of the UE 30 of the destination of the packet, the packet is transmitted to the UE 30 of the destination. Each of the above devices and nodes, as well as each of the above functions, can be realized in the same manner as the 5G mobile communication network and IETF regulations.

Subsequently, the functions of the SMF 10 and the mapping system 20 included in the transfer control system 1 according to the present embodiment will be described. The SMF 10 and the mapping system 20 are directly or indirectly connected to each other and can transmit and receive information to each other. In addition to the functions according to the present embodiment shown below, the SMF 10 and the mapping system 20 may usually have functions provided by the SMF and the mapping system.

As shown in FIG. 4, the SMF 10 includes a detection unit 11 and a net-side notification unit 12. The detection unit 11 is a functional unit that detects that the correspondence between the UE 30 located in the mobile communication network N and the UPF 40 having a session of the UE 30 (UPF 40 on the communication path formed by the session) has changed. Is. The SMF 10 newly generates a session when the UE 30 newly resides in the mobile communication network N or when the UE 30 moves (handover or the like). The detection unit 11 can detect that the association between the UE 30 and the UPF 40 having the session of the UE 30 has been changed by the session generation function of the SMF 10. The detection unit 11 outputs the detected information indicating the above-mentioned correspondence after the change to the network side notification unit 12.

The information indicating the association is, for example, information in which the IP address of the UE 30 and the IP address of the UPF 40 having a session are associated with each other. The information indicating the association may include only the information related to the UPF40 having the (newly generated) session, which transfers the packet to the LDN70 (xTR90) by the UL CL. For example, as described above, for example, only the information relating to UPF40 closest to gNB50 in the communication path formed by the session may be included. That is, the information indicating the association may be related only to the UPF40 connected to the xTR90 of the above map information.

The network side notification unit 12 is a functional unit that notifies the mapping system 20 of the change detected by the detection unit 11. Specifically, the network side notification unit 12 inputs information indicating the above-mentioned correspondence after the change from the detection unit 11 and transmits the information to the mapping system 20. The above is the function of the SMF 10 according to the present embodiment.

As shown in FIG. 4, the mapping system 20 includes a notification receiving unit 21 and a forwarding system side notification unit 22. The notification receiving unit 21 is a functional unit that receives the notification of the above change from the SMF 10. Specifically, the notification receiving unit 21 receives the information indicating the above-mentioned correspondence after the change transmitted from the SMF 10. The notification receiving unit 21 outputs information indicating the received correspondence to the transfer system side notification unit 22.

The transfer system side notification unit 22 notifies the xTR90 of information according to the correspondence between the UE 30 and the UPF 40 having the session of the UE 30 based on the notification received by the notification reception unit 21 as the information used for packet transfer. It is a functional part to do. The information (information used for packet transfer) corresponding to the association between the UE 30 and the UPF 40 having the session of the UE 30 is, for example, map information. However, the information corresponding to the association between the UE 30 and the UPF 40 having the session of the UE 30 (information used for packet transfer) does not necessarily have to be map information, and the UPF 40 having a session about the UE 30 at the destination of the packet. Any device may be used as long as it is a device capable of transmitting a packet to the device or information for transferring the packet to the UPF40 itself. The transfer system side notification unit 22 stores in advance the correspondence (mapping table) between the UPF40 (for example, the IP address of the UPF40) and the xTR90 (for example, the IP address of the xTR90) directly connected to the UPF40. deep. The notification unit 22 on the transfer system side inputs information indicating the correspondence from the notification reception unit 21. The information indicating the association at the stage transmitted from the SMF 10 is related only to the UPF40 (UPF40 that transfers the packet to the LDN70 by the UL CL) that is connected to the xTR90 and has the UE30 related to the association under its control. If so, the transfer system side notification unit 22 identifies the correspondence between the UE 30 and the xTR 90 from the correspondence between the UE 30 and the UPF 40 notified from the SMF 10 and the correspondence between the UPF 40 and the xTR 90 stored in advance. To do. That is, the transfer system side notification unit 22 generates map information about the UE 30 from the correspondence information related to the UE 30 notified from the SMF 10 and the information stored in advance. Information (map information) indicating the correspondence input from the notification receiving unit 21 is transmitted to the xTR90.

The map information may be generated from the association between the UE 30 and the UPF 40 and the association between the UPF 40 and the xTR 90 by the SMF 10 (the network side notification unit 12) instead of the mapping system 20. In that case, the SMF10 (the network side notification unit 12) stores in advance the association between the UPF40 and the xTR90. In that case, the information (notified change) transmitted from the SMF 10 (the network side notification unit 12) to the mapping system 20 becomes the generated map information.

When the information indicating the association includes information other than the UPF 40 that is connected to the xTR90 and places the UE 30 related to the association under it, the transfer system side notification unit 22 sends the information related to the UPF 40. , Extract from the information indicating the correspondence, generate map information from the extracted information in the same manner as above, and transmit it to xTR90. Immediately after the transfer system side notification unit 22 generates the map information, that is, triggered by the notification being received by the notification reception unit 21, the transfer system side notification unit 22 transmits the map information (correspondence between the UE 30 and the UPF 40 having a session of the UE 30). Notification of information according to the attachment) may be performed for any xTR90.

The transfer system side notification unit 22 may transmit map information to all xTR90s. The xTR90, which is the destination of the map information, receives the transmitted map information and controls the transfer of the packet using the map information.

Alternatively, the map information may be transmitted only to a part of xTR90 corresponding to the correspondence between the UE 30 and the UPF 40 notified from the SMF 10. In this case, the xTR90 as the transmission destination is, for example, UPF40 indicated by the association. Alternatively, the xTR90 as the transmission destination is an xTR90 connected to the UPF40 preset for the UPF40. The preset UPF 40 is, for example, an UPF 40 provided at a location geographically close to the UPF 40 indicated by the association (for example, an UPF 40 directly connected to the UPF 40 indicated by the association). That is, the map information may be transmitted only to the xTR90 connected to the UPF40 indicated by the association and the xTR90 provided at a location geographically close to the xTR90. When communication between UEs 30 in the mobile communication network N is performed only in a geographically narrow range (for example, vehicle-to-vehicle communication), it is also appropriate to transmit map information only in the limited range as described above. The packet is relayed to.

Alternatively, the map information may be transmitted as follows as in the conventional case. The xTR90 confirms whether the map information about the UE 30 at the destination of the packet is stored when the packet is transferred. When the xTR90 does not store the map information, the xTR90 inquires of the mapping system 20 for the map information by designating the UE 30 as the destination of the packet. When the xTR90 inquires about the map information, the transfer system side notification unit 22 transmits the map information about the UE 30 related to the inquiry. The above is the function of the mapping system 20 according to the present embodiment.

Subsequently, the process executed by the transfer control system 1 according to the present embodiment (operation method performed by the transfer control system 1) will be described with reference to the sequence diagram of FIG. First, in the SMF 10, it is detected by the detection unit 11 that the association between the UE 30 and the UPF 40 having the session of the UE 30 is changed according to the movement of the UE 30 or the like (S01). The information indicating the association after the change is transmitted from the network side notification unit 12 to the mapping system 20 (S02).

In the mapping system 20, the information is received by the notification receiving unit 21 (S02). Map information based on the received information is transmitted from the transfer system side notification unit 22 to the xTR90 (S03). The transmitted map information is received by the xTR90 and used to control the transfer of packets. The above is the process executed by the transfer control system 1 according to the present embodiment.

As described above, in the present embodiment, the SMF 10 detects the change in the association between the UE 30 and the UPF 40 having the session of the UE 30, and notifies the mapping system 20 of the transfer system 80. In the transfer system 80, the mapping based on the change is notified from the mapping system 20 to the xTR90 as map information used for packet transfer. Therefore, in the transfer system 80, the transfer destination of the packet can be appropriately grasped regardless of the packet transmitted from the UE 30 to the transfer system 80. With this grasp, packets can be delivered without packet loss. In addition, the packet that reflects the above correspondence can be transferred immediately. Therefore, according to the present embodiment, in the mobile communication network N, the packet can be reliably delivered to the UE 30 after the movement distance of the packet is shortened.

Further, as described above, the map information may be notified to the xTR 90 according to the correspondence between the UE 30 and the UPF 40 notified from the SMF 10. According to this configuration, it is possible to appropriately transfer the information of all UEs 30 in the xTR90 without holding the information, and it is possible to reduce the processing load of the xTR90.

Although the network-side device according to the present embodiment is SMF10, any device other than SMF10 can be used as long as it is a device included in the mobile communication network N and can grasp the correspondence between UE30 and UPF40. It may be a net-side device. For example, AMF (Access and Mobility management Function) may be used as a network side device. Further, although the position management device according to the present embodiment is the mapping system 20, if the device is included in the transfer system 80 provided outside the mobile communication network N, the position other than the mapping system 20 is positioned. It may be a management device. Further, in the present embodiment, the relay device in the mobile communication network N is UPF40, but a relay device other than UPF40 may be used.

The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly by two or more physically and / or logically separated devices. (For example, wired and / or wireless) may be connected and realized by these a plurality of devices.

For example, the SMF 10 and the mapping system 20 (the server device in which the mapping system 20 is realized) according to the embodiment of the present invention may function as a computer that processes the SMF 10 and the mapping system 20 of the present embodiment. FIG. 6 is a diagram showing an example of the hardware configuration of the SMF 10 and the mapping system 20 (the server device in which the SMF 10 is realized) according to the present embodiment. The SMF 10 and the mapping system 20 (the server device in which the above-mentioned SMF 10 is realized) are physically computer devices including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. It may be configured as.

In the following description, the word "device" can be read as a circuit, a device, a unit, or the like. The hardware configuration of the SMF 10 and the mapping system 20 (the server device in which the mapping system 20 is realized) may be configured to include one or more of the devices shown in the figure, or may be configured not to include some devices. You may.

For each function in the SMF 10 and the mapping system 20, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation, and communication by the communication device 1004, the memory 1002, and the memory 1002 It is realized by controlling the reading and / or writing of data in the storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be composed of a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, each functional part of the SMF 10 and the mapping system 20 may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, and data from the storage 1003 and / or the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, each functional unit of the SMF 10 and the mapping system 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001. Although it has been described that the various processes described above are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be mounted on one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to carry out the method according to the embodiment of the present invention.

The storage 1003 is a computer-readable recording medium, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a database, server or other suitable medium containing memory 1002 and / or storage 1003.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. For example, each functional unit of the SMF 10 and the mapping system 20 described above may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. Bus 1007 may be composed of a single bus, or may be composed of different buses between devices.

Further, the SMF 10 and the mapping system 20 (the server device in which the mapping system 20 is realized) include a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable). It may be configured to include hardware such as Gate Array), and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented on at least one of these hardware.

Although the present embodiment has been described in detail above, it is clear to those skilled in the art that the present embodiment is not limited to the embodiment described in the present specification. This embodiment can be implemented as a modified or modified mode without departing from the spirit and scope of the present invention determined by the description of the claims. Therefore, the description of the present specification is for the purpose of exemplifying explanation, and does not have any restrictive meaning to the present embodiment.

Notification of information is not limited to the embodiments / embodiments described herein, and may be performed by other methods. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. It may be carried out by notification information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered Trademarks), GSM®, CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), It may be applied to Bluetooth®, other systems that utilize suitable systems and / or next-generation systems that are extended based on them.

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present specification may be changed as long as there is no contradiction. For example, the methods described herein present elements of various steps in an exemplary order, and are not limited to the particular order presented.

In some cases, the specific operation performed by the specific device in the present specification may be performed by its upper node. For example, when a specific device is a base station, various operations performed for communication with a terminal in a network consisting of one or more network nodes having the base station may be performed. It is clear that it can be done by a base station and / or other network nodes other than the base station, such as, but not limited to, MME or S-GW. Although the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information and the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.

The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present specification may be used alone, in combination, or switched with execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, and the like may be transmitted and received via a transmission medium. For example, the software uses wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave to websites, servers, or other When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission medium.

The information, signals, etc. described herein may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

The terms described herein and / or the terms necessary for understanding the present specification may be replaced with terms having the same or similar meanings. For example, the channel and / or symbol may be a signal. Also, the signal may be a message. Further, the component carrier (CC) may be referred to as a carrier frequency, a cell, or the like.

The terms "system" and "network" as used herein are used interchangeably.

Further, the information, parameters, etc. described in the present specification may be represented by an absolute value, a relative value from a predetermined value, or another corresponding information. .. For example, the radio resource may be indexed.

The names used for the above parameters are not limited in any way. Further, mathematical formulas and the like using these parameters may differ from those expressly disclosed herein. Since the various channels (eg, PUCCH, PDCCH, etc.) and information elements (eg, TPC, etc.) can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect. However, it is not limited.

A base station can accommodate one or more (eg, three) cells (also referred to as sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, small indoor base station RRH: Remote). Communication services can also be provided by Radio Head). The term "cell" or "sector" refers to a part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage. In addition, the terms "base station," "eNB," "cell," and "sector" may be used interchangeably herein. Base stations are sometimes referred to by terms such as fixed stations, NodeBs, eNodeBs (eNBs), access points, femtocells, and small cells.

Mobile communication terminals may be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, etc. It may also be referred to as a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

The terms "determining" and "determining" as used herein may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment, calculation, computing, processing, deriving, investigating, looking up (for example, table). , Searching in a database or another data structure), ascertaining can be considered as a "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in memory) may be regarded as "judgment" or "decision". In addition, "judgment" and "decision" mean that the things such as solving, selecting, choosing, establishing, and comparing are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision".

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. As used herein, the two elements are by using one or more wires, cables and / or printed electrical connections, and, as some non-limiting and non-comprehensive examples, radio frequencies. By using electromagnetic energies such as electromagnetic energies with wavelengths in the region, microwave region and light (both visible and invisible) regions, they can be considered to be "connected" or "coupled" to each other.

The phrase "based on" as used herein does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

When the terms "first", "second", etc. are used herein, any reference to the elements does not generally limit the quantity or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.

As long as "include", "including", and variations thereof are used within the scope of the present specification or claims, these terms are similar to the term "comprising". Is intended to be inclusive. Furthermore, the term "or" as used herein or in the claims is intended not to be an exclusive OR.

In the present specification, a plurality of devices shall be included unless the device is clearly present in only one context or technically. In the whole of the present disclosure, if the context clearly does not indicate the singular, it shall include more than one.

1 ... Transfer control system, 10 ... SMF, 11 ... Detection unit, 12 ... Network side notification unit, 20 ... Mapping system, 21 ... Notification reception unit, 22 ... Transfer system side notification unit, 30 ... UE, 40 ... UPF, 50 ... gNB, 60 ... DN, 70 ... LDN, 80 ... Transfer system, 90 ... xTR, N ... Mobile communication network, 1001 ... Processor, 1002 ... Memory, 1003 ... Storage, 1004 ... Communication device, 1005 ... Input device, 1006 ... output device, 1007 ... bus.

Claims (5)

Includes a network-side device included in the mobile communication network and a position management device provided outside the mobile communication network and included in a transfer system that transfers packets transmitted from the mobile communication network to the external network. It is a transfer control system
The net-side device is
A detection unit that detects that the correspondence between the mobile communication terminal located in the mobile communication network and the relay device on the communication path of the mobile communication terminal has changed.
A network-side notification unit that notifies the position management device of changes detected by the detection unit is provided.
The position management device is
A notification receiving unit that receives notification of the change from the network side device, and
The transfer system includes information according to the correspondence between the mobile communication terminal and the relay device on the communication path of the mobile communication terminal based on the notification received by the notification receiving unit as information used for packet transfer. Notification unit on the transfer system side that notifies the transfer device
Transfer control system with. A plurality of the transfer devices are provided according to the relay device.
The transfer control system according to claim 1, wherein the transfer system side notification unit notifies the transfer device corresponding to the association with information corresponding to the association. The transfer control system according to claim 1 or 2, wherein the notification is notified by the notification receiving unit as a trigger. Includes a network-side device included in the mobile communication network and a position management device provided outside the mobile communication network and included in a transfer system that transfers packets transmitted from the mobile communication network to the external network. It is a network-side device included in the transfer control system.
A detection unit that detects that the correspondence between the mobile communication terminal located in the mobile communication network and the relay device on the communication path of the mobile communication terminal has changed.
A network-side device including a network-side notification unit that notifies the position management device of changes detected by the detection unit. Includes a network-side device included in the mobile communication network and a position management device provided outside the mobile communication network and included in a transfer system that transfers packets transmitted from the mobile communication network to the external network. A position management device included in the transfer control system.
A notification receiving unit that receives a notification of a change in the association between the mobile communication terminal located in the mobile communication network and the relay device on the communication path of the mobile communication terminal from the network side device.
The transfer system includes information according to the correspondence between the mobile communication terminal and the relay device on the communication path of the mobile communication terminal based on the notification received by the notification receiving unit as information used for packet transfer. Notification unit on the transfer system side that notifies the transfer device
A position management device including.

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