WO2019159452A1

WO2019159452A1 - Transfer control system, network-side device, and position management device

Info

Publication number: WO2019159452A1
Application number: PCT/JP2018/041870
Authority: WO
Inventors: 宏司坪内; 榑林　亮介; アシックカーン; 賢二福井; アナラゾリーグ
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-02-14
Filing date: 2018-11-12
Publication date: 2019-08-22
Also published as: JP2021068923A

Abstract

The purpose of the present invention is to reduce the packet travel distance and ensure that packets are delivered to a mobile communication terminal in a mobile communication network. A transfer control system 1, including an SMF 10 included in a mobile communication network N, and a mapping system 20 included in a transfer system 80 that is provided outside the mobile communication network N and that transfers packets. The SMF 10 is provided with a detection unit 11 for detecting a change in association between a UE 30 and a UPF 40 having the session of the UE 30, and a network-side notification unit 12 for notifying the mapping system 20 of the detected modification. The mapping system 20 is provided with a notification reception unit 21 for receiving notification of the change from the SMF 10, and a transfer system-side notification unit 22 for notifying information corresponding to the association between the UE 30 and the UPF 40 based on the notification, as information used for packet transfers, to an xTR 90 of the transfer system 80.

Description

Transfer control system, network side device and position management device

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

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

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

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

In the method using the above-described UL CL simply, if the communicating UEs are not under the same UPF and the session of the destination UE of the packet is not provided in the folded UPF, the packet is not received. Unable to reach the destination UE (packet loss).

The above problems can be solved by using LISP. The LISP is realized by a system including a mapping system provided outside the mobile communication network and xTR. The mapping system manages map information and notifies the map information to xTR. For example, the xTR transfers a packet transmitted from the UPF to the LDN so that the packet reaches the LDN corresponding to the destination UE of the packet. The packet can reach the UPF in which the session of the destination UE is provided by the transfer of xTR.

The map information managed by the mapping system is based on packets transmitted from the UE and reaching the xTR. Therefore, even when the UE moves and is under the control of a different UPF, the map information is not updated unless a packet is transmitted from the UE. In this case, when a packet addressed to this UE is transmitted, the packet is not properly transferred, 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 network-side device capable of reliably delivering a packet to a mobile communication terminal after shortening the moving distance of the packet An object is to provide a position management device.

In order to achieve the above object, a transfer control system according to an embodiment of the present invention includes a network-side device included in a mobile communication network, and the mobile communication network provided outside the mobile communication network. A transfer control system including a position management device included in a transfer system for transferring a packet transmitted from the network to an external network, wherein the network side device includes a mobile communication terminal located in the mobile communication network and the mobile A position management device comprising: a detection unit that detects that the association of the communication terminal with the relay device on the communication path has changed; and a network-side notification unit that notifies the position management device of the change detected by the detection unit. Is a notification accepting unit that accepts a change notification from the network side device, and an association between the mobile communication terminal and the relay device on the communication path of the mobile communication terminal based on the notification accepted by the notification accepting unit Comprising a response information, and the transfer system side notification unit for notifying the transfer device included in the transfer system as information to be used to transfer packet.

In the transfer control system according to an embodiment of the present invention, a change in association between a mobile communication terminal and a relay device on a communication path of the mobile communication terminal is detected by a network side device, and the position management device of the transfer system Will be notified. In the transfer system, information corresponding to the association based on the notification is notified from the position management device to the transfer device as information used for packet transfer. Therefore, in the transfer system, it is possible to appropriately grasp the packet transfer destination regardless of the packet transmitted from the mobile communication terminal to the transfer system. Therefore, according to the transfer control system according to an embodiment of the present invention, in the mobile communication network, the packet can be reliably delivered to the mobile communication terminal after the packet moving distance is shortened. Further, the network side device and the location management device included in the above transfer control system have a novel configuration per se and correspond to an invention.

According to one embodiment of the present invention, in the transfer system, the packet transfer destination can be properly grasped regardless of the packet transmitted from the mobile communication terminal to the transfer system. It is possible to reliably reach the mobile communication terminal after shortening the moving distance.

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 routing table memorize | stored in the router of DN or LDN. It is a figure which shows UL CL set to UPF. It is a figure which shows the function structure of SMF and the mapping system which are contained in the transfer control system which concerns on embodiment of this invention. It is a sequence diagram which shows the process performed with the transfer control system which concerns on embodiment of this invention. It is a figure which shows the hardware constitutions of SMF and the mapping system which are contained in the transfer control system which concerns on embodiment of this invention.

Hereinafter, embodiments of a transfer control system, a network device, and a location management device according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 shows a transfer control system 1 according to this embodiment. The transfer control system 1 includes an SMF (Session Management Function) 10 that is a network side device according to the present embodiment, and a mapping system 20 that is a location management device according to the present embodiment. The transfer control system 1 is a system that controls 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, the mobile communication network is not necessarily a 5G mobile network and may be a mobile communication network having a framework conforming to the present embodiment.

The mobile communication network N includes an SMF 10 and a plurality of UPFs 40 as components of the core network. The mobile communication network N includes a plurality of gNBs (gNodeBs) 50 as a configuration of the radio access network. The nodes of the mobile communication network N such as the SMF 10, the UPF 40, and the gNB 50 may be realized by a virtual server that operates in a virtual machine that is realized on a physical server that is a network infrastructure of the mobile communication network N. The mobile communication network N may include devices and nodes included in a normal mobile communication network other than those described above.

The SMF 10 is a node that performs session management in the mobile communication network N. The UPF 40 is a relay device that relays user data that is a packet transmitted and received by the UE 30 in the mobile communication network N. The UPF 40 is connected to another preset UPF 40 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 base station function. The gNB 50 is connected to any one of the plurality of UPFs 40 and relays a packet transmitted / received by the UE 30 under its control with the UPF 40. The UPF 40 and the gNB 50 are usually provided for each position in the communication area of the mobile communication network N. Packets transmitted and received by the UE 30 are relayed by the gNB 50 close to the position of the UE 30 and the UPF 40 connected to the gNB 50.

One UPF 40 ("UPF0" in FIG. 1) among the plurality of UPFs 40 is connected to a DN (data network) 60 that 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 DN 60. 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 provided on the UPF 40. Specifically, session information related to the session is generated in the UPF 40 constituting the session. For example, in the example of FIG. 1, the session up to DN 60 of “UE1” is routed through gNB50 that places “UE1” under its control, “UPF1” connected to gNB50, and “UPF0” connected to “UPF1”. Generated. A packet from “UE1” is transmitted to DN 60 via UPF 40 having this session, and a packet to “UE1” is transmitted from DN 60. That is, in the mobile communication network N, tree-based routing is performed with “UPF0” connected to the DN 60 as an anchor.

When a packet is transmitted / received between UEs 30 located in the mobile communication network N, the packet (communication) is returned by the DN 60. Specifically, packet folding is performed as follows. A router (not shown) included in the DN 60 stores information on the routing table shown in FIG. 2 in advance. The routing table associates a packet destination with a next hop that is information indicating a node to which the router next transmits the packet. The destination is, for example, the IP address of the UE 30 that is 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 router of the DN 60 shown in FIG. 1 stores the route table shown in FIG. The routing table shown in FIG. 2A indicates that a packet addressed to any UE 30 located in the mobile communication network N is transmitted to “UPF0”. The router of the DN 60 receives the packet from the mobile communication network N from “UPF0” and transmits it according to the route table. Therefore, the router of the DN 60 transmits a packet addressed to any UE 30 located in the mobile communication network N to “UPF0” according to the route table. Note that the above-described loopback is not performed for packets destined for other than the UE 30 located in the mobile communication network N, and is 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, if the packet is transmitted to the DN 60 and turned back, the moving distance of the packet may become long. In order to shorten the moving distance of the packet, the above-described UL CL is used. The UL CL causes the UPF 40 to transmit a packet that satisfies certain conditions 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, a packet addressed to another UE 30 located in the mobile communication network N is transmitted to an LDN (local DN) 70 that is an external network dispersed in a region rather than in a direction toward the DN 60.

UL CL is information describing a rule for transferring a packet. For example, as shown in FIG. 3, UL CL associates a packet destination with a next hop that is information indicating a node to which the UPF 40 transmits the packet next. The destination is, for example, the IP address of the UE 30 that is 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 in the UPF 40 having the session of the UE 30 for each UE 30. For example, the UPF 40 closest to the gNB 50 in the communication path formed by the session (the UPF 40 connected to the gNB 50) is set. In the session of “UE1” shown in FIG. 1, UL CL for transmitting a packet addressed to any UE 30 located in the mobile communication network N to “LDN1” is set in “UPF1”. When transferring a packet, the UL CL has priority over the session. That is, when the received packet meets the conditions set in the UL CL, the UPF 40 transmits the packet to the destination set in the UL CL instead of the destination specified by the session. The UL CL setting is performed by the SMF 10 at the time of session setting.

In the LDN 70 to which the packet is transmitted, the route table is stored in the router similarly to the DN 60, and the packet is transferred according to the route table. Even in the LDN 70, the packet between the UEs 30 located in the mobile communication network N is 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, since the packet is folded by the LDN 70 instead of the DN 60, the moving distance of the packet can be shortened.

However, when the session related to the UE 30 that is the destination of the packet is not provided in the UPF 40 where the packet is returned from the LDN 70, the mobile communication network N cannot transmit the packet to the UE 30 (packet loss). For example, when “UE1” under “UPF1” illustrated 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 the UPF 40 that reaches “UPF0” connected to the DN 60 via “UPF2”. If there is no “UPF1” on the communication path formed by the session related to “UE2”, the mobile communication network N cannot transmit the packet to “UE2”.

To deal with this, the LISP specified in the IETF can be used. In LISP, a transfer system 80 that is provided outside the mobile communication network N and transfers packets transmitted from the mobile communication network N to the external network is used. The transfer system 80 includes the mapping system 20 and a plurality of xTRs 90. The mapping system 20 is a location management device that acquires map information of the UE 30. The mapping system 20 is connected so as to be able to transmit / receive information to / from each xTR 90, and notifies each xTR 90 of the acquired map information. The map information is information in which a terminal ID that is an identifier of the UE 30 is associated with a position ID that is an identifier of the UE 30 position. The terminal ID is, for example, the IP address of the UE 30. The location ID is an IP address of xTR 90 corresponding to the UE 30.

XTR90 is a transfer device that transfers packets. The xTR 90 is provided between each LDN 70 and the UPF 40 that transmits a packet to the LDN 70 by UL CL. In other words, the xTR 90 is connected to the UPF 40 and the LDN 70 that are set in advance for each xTR 90, and a plurality of xTR 90 are provided according to the UPF 40. Each xTR 90 is connected, and the xTR 90 can transmit / receive information to / from another xTR 90. Note that the xTR 90 may also be provided between “UPF0” and the DN 60. The xTR 90 corresponding to the UE 30 indicated by the position ID of the map information is based on the UPF 40 that places the UE 30 under control (the 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. It is an xTR 90 provided between the LDN 70 as a packet transfer destination. Usually, the UPF 40 and the xTR 90 are provided at physically close positions. That is, the xTR 90 corresponding to the UE 30 indicated by the position ID of the map information is the xTR 90 corresponding to the position of the UE 30.

The xTR 90 receives notification of map information from the mapping system 20, stores the map information, and uses it for packet transfer control. The storage of the map information may be cached for a certain time. That is, the map information for the UE 30 that has not relayed packets for a certain period may be deleted. The xTR 90 receives a packet transmitted from the UPF 40 to the LDN 70 by UL CL. The xTR 90 refers to the destination of the received packet. The xTR 90 refers to the location ID related to the destination UE 30 of the received packet from the map information stored by itself.

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

On the other hand, when the xTR 90 indicated by the position ID is not 90, the xTR 90 transmits a packet to the xTR 90 indicated by the position ID. When the xTR 90 receives a packet from another xTR 90, the xTR 90 returns the packet to the UPF 40 connected to the 90 (putting the UE 30 that is the destination of the packet under control). Since the UPF 40 is provided with a session of the packet destination UE 30, the packet is transmitted to the destination UE 30. Each of the above devices and nodes, and the above-described functions can be realized in the same manner as in the 5G mobile communication network and IETF.

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

As shown in FIG. 4, the SMF 10 includes a detection unit 11 and a network side notification unit 12. The detecting unit 11 is a functional unit that detects that the association between the UE 30 residing in the mobile communication network N and the UPF 40 (UPF 40 on the communication path formed by the session) having the session of the UE 30 has changed. It is. The SMF 10 newly generates a session as necessary when the UE 30 is newly located 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 information indicating the detected association 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 is associated with the IP address of the UPF 40 having a session. The information indicating the association may include only information related to the UPF 40 that transfers a packet to the LDN 70 (xTR 90) by the UL CL among the UPFs 40 having a (newly generated) session. For example, as described above, for example, only information related to the UPF 40 closest to the gNB 50 in the communication path formed by the session may be included. That is, the information indicating the association may relate to only the UPF 40 connected to the xTR 90 of the map information.

The network side notification unit 12 is a functional unit that notifies the mapping system 20 of changes detected by the detection unit 11. Specifically, the network side notification unit 12 inputs information indicating the above-described association 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 reception unit 21 and a transfer system side notification unit 22. The notification receiving unit 21 is a functional unit that receives the notification of the change from the SMF 10. Specifically, the notification receiving unit 21 receives information indicating the above-described association after the change transmitted from the SMF 10. The notification receiving unit 21 outputs information indicating the received association to the transfer system side notification unit 22.

The transfer system side notification unit 22 notifies the xTR 90 of information corresponding to the association 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 information used for packet transfer. It is a functional part to do. The information (information used for packet transfer) according to the association between the UE 30 and the UPF 40 having a session of the UE 30 is specifically map information, for example. 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) is not necessarily map information, and the UPF 40 having a session for the UE 30 that is the destination of the packet. Any device that can transmit a packet to the network or information for performing transfer to the UPF 40 itself may be used. The transfer system side notification unit 22 stores in advance a correspondence (mapping table) between the UPF 40 (for example, the IP address of the UPF 40) and the xTR 90 (for example, the IP address of the xTR 90) directly connected to the UPF 40. deep. The transfer system side notification unit 22 inputs information indicating the association from the notification reception unit 21. The information indicating the association at the stage of transmission from the SMF 10 relates only to the UPF 40 that is connected to the xTR 90 and places the UE 30 related to the association under control (the UPF 40 that forwards the packet to the LDN 70 by UL CL). If it is, the transfer system side notification unit 22 identifies the association between the UE 30 and the xTR 90 from the association between the UE 30 and the UPF 40 notified from the SMF 10 and the association 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 association input from the notification receiving unit 21 is transmitted to the xTR 90.

The generation of map information from the association between the UE 30 and the UPF 40 and the association between the UPF 40 and the xTR 90 may be performed not by the mapping system 20 but by the SMF 10 (its network side notification unit 12). In that case, the SMF 10 (the network side notification unit 12) stores the association between the UPF 40 and the xTR 90 in advance. In this case, information (change to be notified) transmitted from the SMF 10 (the network side notification unit 12) to the mapping system 20 is generated map information.

When the information indicating the association includes information other than the UPF 40 that is connected to the xTR 90 and places the UE 30 related to the association under control, the transfer system-side notification unit 22 displays the information about the UPF 40. The map information is extracted from the information indicating the association, map information is generated from the extracted information in the same manner as described above, and is transmitted to the xTR 90. The transfer system-side notification unit 22 transmits map information (corresponding to the UE 30 and the UPF 40 having the session of the UE 30) immediately after generating the map information, that is, triggered by reception of the notification by the notification reception unit 21. Notification of information according to the attachment) may be performed on any xTR 90.

The transfer system side notification unit 22 may transmit the map information to all the xTRs 90. The xTR 90 that is the transmission destination of the map information receives the transmitted map information, and controls packet transfer using the map information.

Alternatively, the map information may be transmitted only to a part of the xTR 90 corresponding to the association between the UE 30 and the UPF 40 notified from the SMF 10. In this case, the xTR 90 as the transmission destination is, for example, the UPF 40 indicated by the association. Alternatively, the xTR 90 that is the transmission destination is the xTR 90 that is connected to the UPF 40 set in advance for the UPF 40 in addition to this. The preset UPF 40 is, for example, a UPF 40 provided in a location geographically close to the UPF 40 indicated by the association (for example, a UPF 40 directly connected to the UPF 40 indicated by the association). In other words, the map information may be transmitted only to the xTR 90 connected to the UPF 40 indicated by the association and the xTR 90 provided in a location geographically close to the xTR 90. When communication between the UEs 30 in the mobile communication network N is performed only in a geographically narrow range (for example, inter-vehicle communication), it is appropriate to transmit map information only to a limited range as described above. Packets are relayed at the same time.

Alternatively, the map information may be transmitted as follows as in the conventional case. The xTR 90 checks whether map information about the UE 30 that is the destination of the packet is stored when the packet is transferred. When the map information is not stored, the xTR 90 inquires of the mapping system 20 about the map information by specifying the UE 30 that is the destination of the packet. When there is an inquiry about the map information from the xTR 90, 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, processing executed by the transfer control system 1 according to this embodiment (an 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, the detection unit 11 detects 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). 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 notification receiving unit 21 receives the information (S02). Map information based on the received information is transmitted from the transfer system side notification unit 22 to the xTR 90 (S03). The transmitted map information is received by the xTR 90 and used to control packet transfer. The above is the processing executed in the transfer control system 1 according to the present embodiment.

As described above, in the present embodiment, the SMF 10 detects a change in 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 association based on the change is notified from the mapping system 20 to the xTR 90 as map information used for packet transfer. Therefore, in the transfer system 80, the transfer destination of the packet can be properly grasped regardless of the packet transmitted from the UE 30 to the transfer system 80. With this grasp, the packet can be delivered without packet loss. Further, it is possible to immediately transfer a packet reflecting the above association. Therefore, according to the present embodiment, in the mobile communication network N, it is possible to reliably reach the UE 30 after shortening the moving distance of the packet.

Further, as described above, the map information may be notified to the xTR 90 corresponding to the association between the UE 30 and the UPF 40 notified from the SMF 10. According to this configuration, the xTR 90 can appropriately transfer without holding the information of all the UEs 30, and the processing load on the xTR 90 can be reduced.

Although the network side device according to the present embodiment is the SMF 10, any device other than the SMF 10 can be used as long as it is a device included in the mobile communication network N and can grasp the correspondence between the UE 30 and the UPF 40. It may be a network side device. For example, AMF (Access and Mobility management Function) may be used as the network side device. Further, the location management device according to the present embodiment is the mapping system 20, but any device other than the mapping system 20 may be used as long as it is a device included in the transfer system 80 provided outside the mobile communication network N. A management device may be used. In this embodiment, the relay device in the mobile communication network N is the UPF 40, but a device other than the UPF 40 may be a relay device.

In addition, the block diagram used for description of the said embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one device physically or logically coupled, or two or more devices physically or logically separated may be directly or indirectly (for example, (Using wired, wireless, etc.) and may be implemented using these multiple devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Functions include decision, determination, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, There are broadcast, notification, communication, forwarding, configuration, reconfiguring, allocating, mapping, and assigning. I can't. For example, a functional block (configuration unit) that causes transmission to function is referred to as a transmitting unit or a transmitter. In any case, as described above, the realization method is not particularly limited.

For example, the SMF 10 and the mapping system 20 (a server device in which the system is realized) according to an embodiment of the present disclosure may function as a computer that performs the processing of the method of the present disclosure. FIG. 6 is a diagram illustrating an example of a hardware configuration of the SMF 10 and the mapping system 20 (a server device in which the mapping system 20 is implemented) according to an embodiment of the present disclosure. The above-described SMF 10 and mapping system 20 (a server device in which the SMF 10 and the mapping system 20 are realized) physically include 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 term “apparatus” 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 (a server device in which the SMF 10 and the mapping system 20 are realized) may be configured to include one or a plurality of the devices illustrated in the figure, or may be configured not to include some devices. May be.

Each function in the SMF 10 and the mapping system 20 reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculation and controls communication by the communication device 1004. This is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, each function in the SMF 10 and the mapping system 20 may be realized by the processor 1001.

In addition, the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to 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 embodiments is used. For example, each function in the SMF 10 and the mapping system 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and includes, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be. The memory 1002 may be called 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, and the like that can be executed to perform the method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, 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 above-described storage medium may be, for example, a database including at least one of the memory 1002 and the storage 1003, a server, or other suitable medium.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be constituted by. For example, each function in 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 accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Also, the devices such as the processor 1001 and the memory 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using a different bus for each device.

In addition, the SMF 10 and the mapping system 20 (a server device in which the SMF 10 and the mapping system 20 are realized) are a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable). Gate Array) may be included, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware.

The notification of information is not limited to the aspect / embodiment described in the present disclosure, and may be performed using other methods. For example, notification of information 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), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. The RRC signaling may be called 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 in this disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication system). system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and extended based on these It may be applied to at least one of the next generation systems. A plurality of systems may be combined and applied (for example, a combination of at least one of LTE and LTE-A and 5G).

The processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in the present disclosure may be interchanged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using an exemplary order and are not limited to the specific order presented.

The specific operation assumed to be performed by the base station in the present disclosure may be performed by the upper node in some cases. In a network composed of one or more network nodes having a base station, various operations performed for communication with a terminal are performed by a network node other than the base station and the base station (for example, MME or Obviously, this can be done by at least one of S-GW and the like. Although the case where there is one network node other than the base station in the above is illustrated, a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

Information etc. 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 or the like may be stored in a specific place (for example, a memory) or may be managed using a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.

The determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true / false value (Boolean: true or false), or may be compared with a numerical value (for example, a predetermined value) Comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, may be used in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.

Although the present disclosure has been described in detail above, it is obvious for those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and changes without departing from the spirit and scope of the present disclosure determined by the description of the scope of claims. Accordingly, the description of the present disclosure is for illustrative purposes and does not have any limiting meaning to the present disclosure.

Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

Also, software, instructions, information, etc. may be transmitted / received via a transmission medium. For example, the software uses websites using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) When transmitted from a server or other remote source, at least one of these wired and wireless technologies is included within the definition of a transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, commands, 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 May be represented by a combination of

Note that the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meaning. For example, at least one of the channel and the symbol may be a signal (signaling). The signal may be a message. In addition, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, or the like.

The terms “system” and “network” used in this disclosure are used interchangeably.

Further, information, parameters, and the like described in the present disclosure may be expressed using absolute values, may be expressed using relative values from predetermined values, or may be expressed using other corresponding information. May be represented. For example, the radio resource may be indicated by an index.

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

In the present disclosure, “base station (BS)”, “radio base station”, “fixed station”, “NodeB”, “eNodeB (eNB)”, “gNodeB (gNB)”, “ "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", " Terms such as “carrier”, “component carrier” and the like may be used interchangeably. A base station may also be called terms such as a macro cell, a small cell, a femto cell, and a pico cell.

The base station can accommodate one or a plurality of (for example, three) cells. If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: A communication service can also be provided by Remote Radio Head) The term “cell” or “sector” means a part or the whole of the coverage area of at least one of the base station and the base station subsystem that performs the communication service in this coverage. Point to.

In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” may be used interchangeably. .

A mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.

At least one of the base station and the mobile station may be referred to as a transmission device, a reception device, a communication device, or the like. Note that at least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (for example, a car, an airplane, etc.), an unattended moving body (for example, a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, the communication between the base station and the user terminal is replaced with communication between a plurality of user terminals (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything) may be called)) Each aspect / embodiment of the present disclosure may be applied to the configuration. In addition, words such as “up” and “down” may be read as words corresponding to communication between terminals (for example, “side”). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

The terms “determining” and “determining” used in this disclosure may encompass a wide variety of actions. “Judgment” and “decision” are, for example, judgment, calculation, calculation, processing, derivation, investigating, searching (looking up, search, inquiry) (E.g., searching in a table, database, or other data structure), including ascertaining that it is "certain" or "determined". In addition, “determination” and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as "determined" or "determined". In addition, “determination” and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”. “Judgment (decision)” may be read as “assuming”, “expecting”, “considering”, and the like.

The terms “connected”, “coupled”, or any variation thereof, means any direct or indirect connection or coupling between two or more elements and It can include the presence of one or more intermediate elements between two “connected” or “coupled” elements. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access”. As used in this disclosure, the two elements are used in at least one of one or more wires, cables and printed electrical connections, and as a non-limiting and non-inclusive example, in the radio frequency domain. It can be considered to be “connected” or “coupled” to each other, such as with electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.

«As used in this disclosure, the phrase“ based on ”does not mean“ based only on, ”unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

Any reference to elements using designations such as “first”, “second”, etc. as used in this disclosure does not generally limit the amount or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to the first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some way.

In this disclosure, where “include”, “including” and variations thereof are used, these terms are inclusive, as are the terms “comprising”. Is intended. Further, the term “or” as used in this disclosure is not intended to be an exclusive OR.

In the present disclosure, for example, when articles are added by translation such as a, an, and the in English, the present disclosure may include plural nouns that follow these articles.

In the present disclosure, the term “A and B are different” may mean “A and B are different from each other”. The term may mean “A and B are different from C”. Terms such as “leave”, “coupled” and the like may also be interpreted similarly to “different”.

DESCRIPTION OF SYMBOLS 1 ... Transfer control system, 10 ... SMF, 11 ... Detection part, 12 ... Network side notification part, 20 ... Mapping system, 21 ... Notification reception part, 22 ... Transfer system side notification part, 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

A network-side device included in the mobile communication network, and a location management device provided outside the mobile communication network and included in a transfer system for transferring a packet transmitted from the mobile communication network to the external network. A transfer control system,
The network side device
A detection unit for detecting that the association between the mobile communication terminal residing 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 for notifying the location management device of changes detected by the detection unit,
The location management device includes:
A notification receiving unit that receives the notification of the change from the network side device;
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 is included in the transfer system as information used for packet transfer A transfer system-side notification unit for notifying the transfer device,
A transfer control system comprising:
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 of information corresponding to the association.
The transfer control system according to claim 1 or 2, wherein the transfer system side notification unit performs notification by using a notification received by the notification reception unit as a trigger.
A network-side device included in the mobile communication network, and a location management device provided outside the mobile communication network and included in a transfer system for transferring a packet transmitted from the mobile communication network to the external network. A network side device included in the transfer control system,
A detection unit for detecting that the association between the mobile communication terminal residing in the mobile communication network and the relay device on the communication path of the mobile communication terminal has changed,
A network side device comprising: a network side notification unit that notifies the location management device of a change detected by the detection unit.
A network-side device included in the mobile communication network, and a location management device provided outside the mobile communication network and included in a transfer system for transferring a packet transmitted from the mobile communication network to the external network. A location management device included in a transfer control system,
A notification receiving unit that receives a notification of a change in association between a mobile communication terminal residing in the mobile communication network and a relay device on a communication path of the mobile communication terminal from the network side device;
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 is included in the transfer system as information used for packet transfer A transfer system-side notification unit for notifying the transfer device,
A position management device comprising: