JP7274633B2 - Communication system, controller, program, and information processing method - Google Patents

Description

The present invention relates to a communication system, controller, program, and information processing method.

Patent Literature 1 describes slicing in a mobile network conforming to 5G (5th Generation).
[Prior art documents]
[Patent Literature]
[Patent Document 1] JP 2019-176384 A

According to one embodiment of the invention, a communication system is provided. A communication system may comprise a controller. The communication system may comprise an SR gateway that converts SRv6 compliant packets received from an IP network into GTP-U compliant packets. The SR gateway notifies the controller and routers connected to the IP network of the NLRI IP prefix containing the address of the connected gNB and the AD route containing the SID of the SR gateway in the BGP attributes. may have The controller may have a storage unit that associates and stores the IP prefix including the address of the gNB and the SID of the SR gateway. The controller searches the storage unit using the address of the gNB included in the PFCP session notified when the UE is attached as a key, and if there is a match, the route information of the UE has an advertising unit that advertises to the router. You can

The notification unit may notify the controller and the router of the AD route including the address of the gNB connected to the EP of the NLRI and the SID of the SR gateway. The advertising unit adds a community attribute imported by the router to the route information of the UE so that the router receives the route information of the UE and registers the route to the UE in the route table of the router. may be advertised to the router. The advertising unit may add the community attribute, which is included in the PFCP session and differs for each core network instance, to the route information of the UE. The advertising unit may add the community attribute, which is included in the PFCP session and differs for each group of the gNBs, to the route information of the UE. The advertising unit uses the IP prefix including the address of the UE included in the PFCP session, the IP address of the gNB, the TEID, and the QFI and RQI as the route information of the UE, and the NLRI and Nexthop in the MP_REACH_NLRI attribute. - Address. When the NLRI is of the VPNv4 Unicast or VPNv6 Unicast address family, in the Nextop-Address, the 4-byte TEID, the 1-byte QFI and RQI, and the 3-byte Store in the order of zero, or in the order of 3 bytes of zero, 4 bytes of the TEID, and 1 byte of the QFI and RQI, and store the IP address of the gNB in the IP address part of the Nextop-Address, and the NLRI , the TEID, the QFI and the RQI need not be stored. When the effective bit length of the TEID is 16 bits or less, and when the NLRI is of the VPNv4 Unicast or VPNv6 Unicast address family, the advertisement part places 1-byte QFI and RQI in the 24-bit length label part of the NLRI, and The TEID of 2 bytes may be stored, the RD part of the Nextop-Address may be filled with all zeros, and the IP address of the gNB may be stored in the IP address part of the Nextop-Address. The advertisement part includes, in the Prefix-SID attribute, the Locator of the SID corresponding to the conversion part of the SR gateway and the Argument part following the Function part, the IP address of the gNB included in the PFCP session, QFI and RQI, TEID and the previously written SID value as GTP4. E or GTP6. E, and store the IP prefix containing the address of the UE and the IP address of the gNB involved in the PFCP session in the NLRI and Nextop-Address, respectively, in the MP_REACH_NLRI attribute, without storing the TEID. good. The notification unit may notify the controller of the AD path including slice identification information capable of identifying a slice corresponding to the UE in a color attribute.

The communication system may further include the router, and the router detects when the AD route including the address of the gNB is lost and when the AD route advertised by an SR gateway other than the SR gateway is In at least one of the cases where it is determined to be optimal as the AD route in the route information of the UE, autonomously optimal A without waiting for the UE route update advertisement of the UE from the controller The SID destined for the UE may be associated with the SID of the -D path.

The communication system may further include the router, and the router includes an ADRDB, which is a routing table, for searching the AD route received from the SR gateway. you can The ADRDB may be a global routing table of the router. The ADRDB may be a VRF that imports the AD route according to a community attribute value attached to the AD route. The router evaluates the value of the community attribute added to the AD route based on the community attribute that differs for each gBN group registered in advance, and imports the AD route to the ADRDB. You can

According to one embodiment of the invention, a controller is provided. The controller converts SRv6 compliant packets received from the IP network into GTP-U compliant packets from the SR gateway to the NLRI, the IP prefix containing the address of the connected gNB, and the BGP attributes to the SR gateway and a receiving unit for receiving notification information for notifying the AD route including the SID of . The controller may include a storage unit that associates and stores the IP prefix of the VRF including the address of the gNB and the SID of the SR gateway. The controller searches the storage unit using the address of the gNB included in the PFCP session notified when the UE is attached as a key, and when a match is found, the route information of the UE is sent to the router connected to the IP network. An advertising section may be provided for advertising.

According to one embodiment of the present invention, there is provided a program for causing a computer to function as the controller.

According to one embodiment of the present invention, a computer-implemented information processing method is provided. The information processing method is from the SR gateway that converts SRv6 compliant packets received from the IP network into GTP-U compliant packets, to the NLRI, the IP prefix containing the address of the connected gNB, and the BGP attributes: A receiving step may be provided for receiving notification information announcing the AD path including the SID of the SR gateway. The information processing method may comprise storing in a storage unit a VRF prefix containing the address of the gNB and the SID of the SR gateway in association with each other. The information processing method searches the storage unit using the address of the gNB included in the PFCP session notified when the UE is attached as a key, and if it matches, the route information of the UE is connected to the IP network. There may be an advertising stage for advertising to routers.

According to one embodiment of the invention, a communication system is provided. A communication system may comprise a controller. The communication system may comprise an SR gateway that converts SRv6 compliant packets received from an IP network into GTP-U compliant packets. The controller includes information indicating the conversion function from SRv6 to GTP-U and the SID for the UE in the BSID, and generates an SR policy including the SID of the VRF corresponding to the gNB accommodating the UE in the EP of the NLRI. may have a part. The controller may have a notifier that notifies the SR gateway of the SR policy. The SR gateway may have an SR policy storage that stores the SR policy received from the controller. The SR gateway may have a packet forwarding unit that, upon receiving a packet containing the UE SID, identifies the SID of the VRF corresponding to the UE SID based on the SR policy, and forwards the packet. .

The communication system may comprise a PE router, and the PE router imports the SID of the VRF corresponding to the UPF as a UPF route, and upon receiving a packet arrival notification to the UE, Packets may be forwarded to the UPF. The PE router may switch forwarding of packets destined for the UE from longest match forwarding to short prefix path forwarding when the UE transitions to the idle state. The SR gateway may have an advertisement control unit that controls advertisement of route information to the controller, and the advertisement control unit, when advertising the route information indicating the route of the gNB to the controller, determines that the route is When advertising information that can be identified as a gNB route to the controller and advertising the route information indicating a UPF route to the controller, information that can be identified as a UPF route is combined. may be controlled to advertise to the controller.

According to one embodiment of the present invention, a communication system is provided. A communication system may comprise a controller, a first node, and a second node. When the first node is connected to the gNB, the NLRI EP contains the gNB address, the color contains slice identification information that can identify the slice, and the BSID contains the SID corresponding to the slice. There may be a first SR policy transmitter for transmitting. When the second node is connected to the UPF, the NLRI EP contains the UPF address, the color contains slice identification information that can identify the slice, and the BSID contains the SID corresponding to the slice. a second SR policy transmitter that transmits to the . The controller may have an association information storage unit that stores association information that associates network instances with colors. The controller searches the associated information storage unit using the color of the advertised information as a key, identifies the network instance corresponding to the color, and obtains the gNB address and UPF address corresponding to the identified network instance. It may have an advertising unit that identifies, generates a route for the gNB and advertises it to the VRF corresponding to the UPF, and generates a route for the UPF and advertises it to the VRF that corresponds to the gNB.

It should be noted that the above summary of the invention does not list all the necessary features of the invention. Subcombinations of these feature groups can also be inventions.

1 schematically shows an example of the configuration of a communication system 10; FIG. 2 is an explanatory diagram for explaining processing contents in the communication system 10; FIG. 2 is an explanatory diagram for explaining processing contents in the communication system 10; FIG. 2 is an explanatory diagram for explaining processing contents in the communication system 10; An example of the functional structure of N4BGPC300 and the logical structure of the conversion part 450 is shown roughly. An example of another configuration of the communication system 10 is shown schematically. An example of the hardware configuration of the computer 1200 which functions as N4BGPC300, SRGW400, or N4BGPC600 is shown schematically.

Techniques for identifying network slices in mobile networks are known, but have been closed within the mobile network. Although it is desirable to be able to manage network slices including IP networks, the setting of route information and the like can become very complicated. The communication system 10 according to this embodiment provides a technique for reducing the complexity of setting.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Also, not all combinations of features described in the embodiments are essential for the solution of the invention.

FIG. 1 schematically shows an example of the configuration of a communication system 10. As shown in FIG. The communication system 10 includes an N4BGPC (N4 Border Gateway Protocol Controller) 300 . N4BGPC 300 may be an example of a controller. The N4BGPC 300 may be arranged within an SRNW (Segment Routing Network) 20 . The communication system 10 includes an SRGW (Segment Routing Gateway) 400 . SRGW 400 may be located within SRNW 20 .

The SRGW 400 may have the capability to convert SRv6 compliant packets received from the IP network into GTP-U compliant packets. The SRGW 400 may have the capability to convert GTP-U compliant packets received from the mobile network into SRv6 compliant packets.

N4BGPC300 controls SRGW400. The N4BGPC 300 may perform processing related to route control of the SRGW 400 .

In the example shown in FIG. 1, VRF (Virtual Routing and Forwarding) 202, VRF 204, VRF 206, VRF 208, VRF 210, and VRF 220 are arranged in SRNW 20. FIG. It should be noted that illustration of a router that implements each VRF is omitted. SRGW 400 may include VRF 210 . SRGW 400 may include VRF 220 . SRGW 400 may include both VRF 210 and VRF 220 .

The VRF 202 is connected to an SMF (Session Management Function) 110 . VRF 204 , VRF 206 and VRF 208 are connected to UPF (User Plane Function) 120 . VRF 210 is connected to gNB (gNodeB) 130 . In the example shown in FIG. 1 , multiple VRFs 210 are each connected to multiple gNBs 130 . The VRF 220 is connected to a DN (Data Network) 30 . In the example shown in FIG. 1, each of the multiple VRFs 220 is connected to multiple DNs 30 .

N4BGPC 300 obtains information on mobile networks from SMF 110 . N4BGPC300 acquires the PFCP(Packet Forwarding Control Protocol) session information of UE40 from SMF110, for example.

PFCP session information contains the address of UE40, for example. The PFCP session information includes, for example, the address of gNB 130 accommodating UE 40 . PFCP session information contains the address of UPF120 corresponding to UE40, for example. PFCP session information contains the network instance corresponding to UE40, for example. A network instance is, for example, information corresponding to slice identification information that can identify a slice corresponding to the UE 40 in a mobile network as an access network instance. The slice identification information is, for example, S-NSSAI (Single-Network Slice Selection Assistance Information). PFCP session information may include the access network instance. PFCP session information may include a core network instance. A core network instance is, for example, information corresponding to DN identification information that can identify a DN.

The SRGW 400 comprises a transforming unit 410 and a transforming unit 450 . The conversion unit 410 has a function of converting a packet conforming to GTP-U into a packet conforming to SRv6. The conversion unit 410 converts GTP4. It may have the function of D. The converter 410 converts GTP6. It may have the function of D.

The conversion unit 450 has a function of converting packets conforming to SRv6 into packets conforming to GTP-U. The conversion unit 450 converts GTP4. It may have the function of E. The conversion unit 450 converts GTP6. It may have the function of E.

In this embodiment, the N4BGPC 300 performs path setting for relaying communication between a UE (User Equipment) 40 connected to the gNB 130 and a communication partner connected to the DN 30 . A communication partner of the UE 40 may be any communication device such as any server on the Internet, for example.

FIG. 2 is an explanatory diagram for explaining the processing contents in the communication system 10. As shown in FIG. In the example shown in FIG. 2, VRF211 is connected to UPF120, VRF212 is connected to gNB132, VRF213 is connected to gNB133, and VRF214 is connected to gNB134.

The SRGW 400 may control so that when the VRF 211, VRF 212, VRF 213, and VRF 214 advertise route information to the N4BGPC 300, information that can identify whether the route is a UPF route or a gNB route is also advertised. For example, when the VRF 211 advertises the route information of the UPF 120 to the N4BGPC 300, under the control of the SRGW 400, the VRF 211 also advertises to the N4BGPC 300 information that can identify that the route is a UPF route.

For example, when the VRF 212 advertises the route information of the gNB 132 to the N4BGPC 300, under the control of the SRGW 400, the VRF 212 also advertises to the N4BGPC 300 information that can identify that the route is a gNB route. For example, when the VRF 213 advertises the route information of the gNB 133 to the N4BGPC 300, under the control of the SRGW 400, the VRF 213 also advertises to the N4BGPC 300 information that can identify that the route is a gNB route. For example, when the VRF 214 advertises the route information of the gNB 134 to the N4BGPC 300, under the control of the SRGW 400, the VRF 214 also advertises to the N4BGPC 300 information that can identify that the route is a gNB route.

SRGW 400 may advertise route information of VRF 211 , VRF 212 , VRF 213 and VRF 214 to N4BGPC 300 . In this case, when the SRGW 400 advertises the route information indicating the gNB route to the N4BGPC 300, the SRGW 400 advertises to the N4BGPC 300 together with information that can identify that the route is a gNB route, and sends the route information indicating the UPF route to the N4BGPC 300. , it may be advertised to the N4BGPC 300 together with information that can identify that the route is a UPF route.

A packet from the communication partner of DN 30 to UE 40 is transferred to default VRF 230 via PE (Provider Edge) router 50 . The N4BGPC 300 pre-routes the packet so that the SRGW 400 forwards the packet to the VRF 212 housing the UE 40 .

N4BGPC 300 includes information indicating the conversion function from SRv6 to GTP-U in BSID (Binding Segment ID) and SID 41 for UE 40, and VRF 212 corresponding to gNB 132 accommodating UE 40 in EP (End Point) of NLRI Create SR policy 500 including SID 222 . Information indicating the conversion function from SRv6 to GTP-U is, for example, GTP4. E or GTP6. It is E. The N4BGPC 300 then notifies the SRGW 400 of the generated SR policy 500 .

Conversion unit 450 of SRGW 400 stores SR policy 500 notified from N4BGPC 300 . Upon receiving a packet including SID41 for UE40, converter 450 specifies SID222 of VRF212 corresponding to SID41 for UE40 based on stored SR policy 500, and transfers the packet.

As described above, in the communication system 10, by using the EP and BSID of the SR policy 500, the route of the UE 40 can be set. N4BGPC300 which concerns on this embodiment includes SID222 of VRF212 in EP as information for specifying VRF212 corresponding to gNB132 which accommodates UE40. RD (Route Distinguisher) is also available as information that can identify the VRF 212 . However, the format of the EP is 4 or 16 bytes, whereas the format of the RD is 2 bytes + 2 or 4 bytes + 4 or 2 bytes = 8 bytes, so the formats do not match. On the other hand, since the SID format is 16 bytes, it matches the EP. That is, by using SID, there is an advantage that the VRF corresponding to the gNB accommodating the UE can be identified within the standard range. There is also the advantage that setting can be facilitated by using the SID automatically assigned by the router at run time.

FIG. 3 is an explanatory diagram for explaining the processing contents in the communication system 10. As shown in FIG. Here, details of processing related to paging in the communication system 10 will be described.

In mobile networks, UPF 120 performs paging. For example, when a packet addressed to UE40 arrives after UE40 has transitioned to the idle state, UPF 120 causes gNB to call UE40 and transitions to a state in which UE40 can receive packets.

In the communication system 10 according to the present embodiment, for example, a paging function can be installed in a PE router or the like to replace the function of the UPF 120. However, the PE router becomes expensive and the load on the PE router increases. There are demerits such as increased size. Therefore, the PE router 700 according to the present embodiment imports the SID of the VRF 208 corresponding to the UPF 120 as the route of the UPF 120, and when receiving a packet arrival notification to the UE 40 via the SMF 110 and the N4BGPC 300, , is transferred to UPF 120 via VRF 208 .

When the UE 40 transitions to the idle state, the PE router 700 may switch the transfer of the packet addressed to the UE 40 from the transfer with the longest match to the transfer with the short prefix path. In the mobile network, the UPF 120 is positioned above the UE 40 and is assigned a higher address. Therefore, the packet can be transferred to the UPF 120 by switching the transfer of the packet destined for the UE 40 from the normal longest match transfer to the short prefix route transfer.

The N4BGPC 300 may delete the route destined for the UE 40 that has entered the idle state from the PE router 700 so that the PE router 700 switches to forwarding on the short prefix route. The N4BGPC 300 may delete the route to the UE 40 that has entered the idle state from the PE router 700 while internally holding it. This has the advantage that the SRNW 20 side can grasp that the UE 40 is not disconnected but is in an idle state.

FIG. 4 is an explanatory diagram for explaining the processing contents in the communication system 10. As shown in FIG. Here, a case will be described in which the N4BGPC 300 transfers packets addressed to the UE 40 via the converter 450 by setting the route information of the UE 40 in the VRF 220 connected to the DN 30 .

In this example, when the conversion unit 450 of the SRGW 400 receives the route information of the gNB 130 from the VRF 210, the IP prefix including the address of the gNB 130 and the AD route including the SID of the SRGW 400 are notified to the NLRI to the N4BGPC 300. . The conversion unit 450 may include the address of the gNB 130 in the EP of the NLRI. N4BGPC 300 associates the prefix of VRF 210 including the notified address of gNB 130 with the SID of SRGW 400 and stores them in ADRDB (Auto-Discovery Route Database) 320 . Then, N4BGPC300 refers to the PFCP session 510 including the network instance forming the slice, searches the ADRDB320 using the address of the gNB130 included in the PFCP session 510 as a key, and when a match is found, the route information of the UE40 is advertised to VRF 220 . The route information of UE40 shows the route which transfers the packet addressed to UE40 to SRGW400.

The N4BGPC 300 may add the community attribute imported by the VRF 220 to the route information of the UE 40 so that the VRF 220 receives the route information of the UE 40 and registers the route to the UE 40 in the routing table of the VRF 220 . The community attribute may be an extended community attribute. An extended community attribute may be Route Target.

N4BGPC300 may add the community attribute which shows a network slice to the routing information of UE40. The community attribute may be the community attribute associated with the access network instance, or the S-NSSAI, or a combination of both included in the PFCP session 510 . A community attribute may be a color community.

The N4BGPC 300 may add community attributes, which are included in the PFCP session 510 and differ for each core network instance, to the route information of the UE 40 . The N4BGPC 300 may add different community attributes for each group of gNBs 130 included in the PFCP session 510 to the route information of the UE 40 . An example of a group of gNBs 130 is a group for each region where the gNBs 130 are located. Also, an example of a group of gNBs 130 is a group for each company. For example, in a group of gNBs 130 located on the premises of a certain company, community attributes corresponding to the group may be added to the UE 40 route information. The N4BGPC 300 may pre-register community attributes for each group of gNBs 130 . The N4BGPC 300 may pre-register to which group each of the plurality of gNBs 130 belongs. Information on the group to which the gNB 130 belongs is included in the PFCP session 510, and the N4BGPC 300 may identify the group of the gNB 130 by referring to the information. Here, a case where a different community attribute is added for each core network instance and each group of gNB 130 has been described, but not limited to this, the N4BGPC 300 is included in the PFCP session 510, and a different community attribute for each arbitrary information may be added to the route information of the UE 40. VRF 220 may receive and import UE 40 routes with per-purpose community attributes, such as per core network instance, per gNB group, and so on.

N4BGPC300, as route information of UE40, IP prefix including the UE address of UE40 included in PFCP session 510, IP address of gNB130, TEID (Tunnel endpoint identifier), and QFI (QoS Flow Identifier) and RQI (Reflective QoS Indicator ) may be stored in the NLRI and/or Nextop-Address in the MP_REACH_NLRI attribute. N4BGPC300, as the route information of UE40, the IP prefix including the UE address of UE40 included in the PFCP session 510, the IP address of gNB130, TEID, and QFI and RQI, only NLRI or Nextop-Address in the MP_REACH_NLRI attribute It may be stored, or distributed and stored in both. At this time, the SID value itself corresponding to the conversion unit 450 of the SRGW 400 is set to the Prefix-SID attribute in GTP4. E or GTP6. may be stored as E. Also, multiple MP_REACH_NLRIs for other UEs 40 having the same Prefix-SID attribute may be stored in one BGP update message.

If the NLRI is VPNv4 Unicast or VPNv6 Unicast address family, N4BGPC300 inserts TEID (4 bytes), QFI+RQI (1 byte), zeros (3 bytes ) may be stored in that order. Alternatively, if the NLRI is VPNv4 Unicast or VPNv6 Unicast address family, the N4BGPC 300 inserts zero (3 bytes), TEID (4 bytes), QFI+RQI ( 1 byte). The IP address portion of the Nextop-Address may contain the IP address (4 bytes or 16 bytes) of the gNB 130, and the NLRI may not contain the TEID, QFI and RQI. The PE router 50 having the VRF 220 that accommodates the DN 30 receives this UE 40 route, writes QFI, RQI, and TEID to the Argument part of the SID stored in the Prefix-SID attribute, and transfers the packet addressed to the IP prefix of the UE 40. may update the SID used for SID is GTP4. For E, the gNB 130 address may also be written in the Argument section.

When the effective bit length of TEID is within 16 bits and when NLRI is VPNv4 Unicast or VPNv6 Unicast address family, N4BGPC300 puts QFI and RQI (1 byte) + TEID (2 bytes) in the 24-bit long label part of NLRI. can be stored. In this case, the RD part of Nextop-Address may be filled with zeros. Also, in this case, the IP address portion of the Nextop-Address may store the IP address (4 bytes or 16 bytes) of the gNB 130 . For the SID Structure Transposition of the Prefix-SID attribute, the offset may be specified as the first bit position of the Argument part of the SID + the gNB address length, and the length may be specified as 24 bits to indicate that the NLRI label part is the SID Argument. PE router 50 having VRF220 that accommodates DN30 receives this UE40 route and writes gNB130 address (for GTP4.E), QFI and RQI, and TEID to the Argument part of SID stored in Prefix-SID attribute. , the SID used for forwarding packets destined for the IP prefix of the UE 40 may be updated. GTP6. In case of E, the IPv6 address of gNB 130 may be stored as Last-SID in the SRH of the packet to be transmitted to UE 40 .

N4BGPC300, in the Prefix-SID attribute, the Locator of the SID corresponding to the conversion unit 450 of the SRGW400 and the Argument section following the Function section, the address of the gNB130 included in the PFCP session 510 (in the case of GTP4.E), QFI and RQI and TEID are stored in GTP4. E or GTP6. may be stored as E. At this time, the N4BGPC 300 may use any existing address family. N4BGPC 300 may store the IP prefix containing the UE address of UE 40 involved in PFCP session 510 and the IP address of gNB 130 in the NLRI and Nextop-Address, respectively, in the MP_REACH_NLRI attribute, and may not store the TEID. . The PE router 50 having the VRF 220 that accommodates the DN 30 may receive this route information of the UE 40 and use the SID stored in the Prefix-SID attribute as it is for forwarding packets addressed to the IP prefix of the UE 40 . GTP6. In case of E, the IPv6 address of gNB 130 may be stored as Last-SID in the SRH of the packet to be transmitted to UE 40 .

An address family may be defined in which the IP prefix including the UE address of the UE 40 included in the PFCP session 510, the IP address and TEID of the gNB 130, and the NLRI and Nexthop in the MP_REACH_NLRI attribute can be stored as the routing information of the UE 40. A new address family is defined to indicate TEID (4 bytes), QFI + RQI (1 byte), zero (3 bytes) + gNB's IP address (4 bytes or 16 bytes) as the encoding of the Nextop-Address of the MP_REACH_NLRI attribute. good. Alternatively, as the Nextop-Address encoding, zero (3 bytes), TEID (4 bytes), QFI+RQI (1 byte)+gNB IP address (4 bytes or 16 bytes) may be indicated. Or, as an encoding of NLRI, it may indicate gNB IP address (4 bytes or 16 bytes) + QFI and RQI (1 byte) + TEID (2 bytes) + UE IP prefix (4 bytes or 16 bytes) Nextop-Address is the gNB address. Alternatively, Nextop-Address may be the loopback address of the hosting SRGW. A new address family may define a field to indicate a 3GPP 4G system, a 5G system, or an IETF's PMIP system, and indicate that there is a unique encoding for each system the field indicates.

As a result, when a packet addressed to UE 40 to which a slice is assigned is sent from DN 30, it can be transferred to SRGW 400 in VRF 220, and the packet converted from SRv6 to GTP-U in conversion unit 450 is , is transferred to the gNB 130 accommodating the UE 40 .

UE 40 may be assigned various types of slices. There are many types of slices, including, but not limited to, ultra-high quality, high quality, medium quality, best effort, and low delay.

The conversion unit 450 of the SRGW 400 may include slice identification information that can identify the slice corresponding to the UE 40 in the color attribute included in the AD path notified to the N4BGPC 300 . The N4BGPC 300 may associate network instance information included in the PFCP session corresponding to slice identification information included in the color attribute. This allows the N4BGPC 300 to identify slice types within the standard.

N4BGPC 300 may advertise the route information of UE 40 to VRF 220 without searching ADRDB 320 using the address of gNB 130 included in PFCP session 510 as a key. When advertising the UE 40 route without searching the ADRDB 320, the UE 40 route may not have the SRGW 400 SID.

FIG. 5 schematically shows an example of the functional configuration of the N4BGPC 300 and the logical configuration of the conversion unit 450. As shown in FIG. The N4BGPC 300 includes a generator 302 , a notification unit 304 , a storage unit 306 , an advertisement unit 308 and an acquisition unit 310 . The N4BGPC 300 may be provided with a part of them without being provided with all of them, or may be provided with a configuration other than these. The conversion unit 450 includes a packet conversion unit 452 , an SR policy storage unit 454 , a packet transfer unit 456 , an advertisement control unit 458 and a notification unit 460 . The conversion unit 450 may be provided with a part of these without being provided with all of them, and may be provided with a configuration other than these.

The generation unit 302 includes information indicating the conversion function from SRv6 to GTP-U in the BSID and the SID for the UE, and generates an SR policy including the SID of the VRF corresponding to the gNB accommodating the UE in the NLRI EP. do. The notification unit 304 notifies the SRGW 400 of the SR policy generated by the generation unit 302 .

The packet conversion unit 452 converts packets conforming to SRv6 into packets conforming to GTP-U. The SR policy storage unit 454 stores the SR policy notified by the notification unit 304 . When receiving a packet including the UE SID, the packet transfer unit 456 identifies the SID of the VRF corresponding to the UE SID based on the SR policy stored in the SR policy storage unit 454, Forward the packet.

The packet forwarding unit 456 may import the SID of the VRF corresponding to the UPF as the UPF path, and upon receiving a packet arrival notification for the UE, may forward the arrival notification to the UPF. When the UE transitions to the idle state, the packet forwarding unit 456 may switch forwarding of packets addressed to the UE from longest match forwarding to short prefix path forwarding.

The advertisement control unit 458 controls advertisement of route information to the N4BGPC 300 . When advertising the route information indicating the gNB route to the N4BGPC 300, the advertisement control unit 458 advertises to the N4BGPC 300 together with information that can identify that the route is a gNB route, and advertises the route information indicating the UPF route to the N4BGPC 300. When advertising to the N4BGPC 300, it may be controlled to advertise to the N4BGPC 300 together with information that can identify that the route is a UPF route.

The notification unit 460, for example, notifies the N4BGPC 300 of the AD route including the IP prefix including the address of the gNB 130 connected to the NLRI and the SID of the SRGW 400 . The notification unit 460 may notify the N4BGPC 300 of the AD path including slice identification information that can identify the slice corresponding to the UE in the color attribute. The notification unit 460 may notify the PE router 50 having the VRF 220 of the AD route.

When the notification unit 460 adds the SID of the SRGW 400 to the AD route and notifies it to the N4BGPC 300, the notification unit 460 does not have to add the SID of the SRGW 400 to the AD route to be notified to the PE router 50 having the VRF220. When the notification unit 460 adds the SID of the SRGW 400 to the AD route and notifies the PE router 50 of it, the notification unit 460 may not add the SID of the SRGW 400 to the AD route to be notified to the N4BGPC 300 . The notification unit 460 may add the SID of the SRGW 400 to both AD routes notified to the N4BGPC 300 and the PE router 50 .

The notification unit 460 may add to the route information of the UE 40 a community attribute that differs for each group of gNBs 130 on the AD route. An example of a group of gNBs 130 is a group for each region where the gNBs 130 are located. Also, an example of a group of gNBs 130 is a group for each company. For example, in a group of gNBs 130 located on the premises of a certain company, community attributes corresponding to the group may be added to the UE 40 route information. The notification unit 460 may register community attributes for each group of gNBs 130 in advance. The notification unit 460 may register in advance which group each of the plurality of gNBs 130 belongs to.

The storage unit 306 associates and stores the VRF 210 notified by the notification unit 460 and the SID of the SRGW 400 . ADRDB 320 may be an example of storage unit 306 . Acquisition unit 310 acquires PFCP session information from SMF 110 . The advertising unit 308 searches the storage unit 306 using the address of the gNB included in the PFCP session notified when the UE is attached as a key, and if it matches, the route information of the UE is connected to the IP network. Advertise to the router that

The advertisement unit 308 may advertise the route information of the UE 40 to the VRF 220 connected to the DN30. The advertisement unit 308 may advertise the route information of the UE 40 to the PE router 50 having the VRF 220 accommodating the DN30.

The advertising unit 308 may add the community attribute imported by the VRF 220 to the route information of the UE 40 so that the VRF 220 receives the route information of the UE 40 and registers the route to the UE 40 in the routing table of the VRF 220 . The community attribute may be an extended community attribute. An extended community attribute may be Route Target.

The advertising unit 308 may add a community attribute, which is included in the PFCP session 510 and differs for each core network instance, to the route information of the UE 40 . The advertising unit 308 may add to the routing information of the UE 40 a community attribute that is included in the PFCP session 510 and differs for each group of gNBs 130 . The advertising unit 308 may add the community attribute corresponding to the access network instance included in the PFCP session 510 to the route information of the UE 40 . The advertising unit 308 may add the community attribute corresponding to the S-NSSAI included in the PFCP session 510 to the route information of the UE 40 . Advertiser 308 may add community attributes corresponding to both the access network instance and the S-NSSAI included in PFCP session 510 to the route information of UE 40 . The N4BGPC 300 may add different community attributes to the routing information of the UE 40 for each piece of arbitrary information included in the PFCP session 510 . VRF 220 may receive and import UE 40 routes with per-core network instance, per gNB group, access network instance, per-purpose community attributes such as S-NSSAI.

Advertisement unit 308 uses the IP prefix including the UE address of UE 40 included in PFCP session 510, the IP address of gNB 130, TEID, and QFI and RQI as route information of UE 40, NLRI and Nextop-Address in MP_REACH_NLRI attribute may be stored in at least one of At this time, the SID value itself corresponding to the conversion unit 450 of the SRGW 400 is set to the Prefix-SID attribute in GTP4. E or GTP6. may be stored as E. Also, multiple MP_REACH_NLRIs for other UEs 40 having the same Prefix-SID attribute may be stored in one BGP update message.

When the NLRI is of the VPNv4 Unicast or VPNv6 Unicast address family, the advertising part 308 adds TEID (4 bytes), QFI+RQI (1 byte), zero ( 3 bytes). Alternatively, when the NLRI is of the VPNv4 Unicast or VPNv6 Unicast address family, the advertising part 308 adds zero (3 bytes), TEID (4 bytes), zero (3 bytes), TEID (4 bytes), It may be stored in the order of QFI+RQI (1 byte). Advertisement portion 308 may store the IP address (4 bytes or 16 bytes) of gNB 130 in the IP address portion of the Nextop-Address and may not store the TEID, QFI and RQI in the NLRI.

When the effective bit length of the TEID is within 16 bits and when the NLRI is of the VPNv4 Unicast or VPNv6 Unicast address family, the advertisement part 308 adds QFI and RQI (1 byte) + TEID (2 bytes) to the NLRI 24-bit label part. ) may be stored. In this case, the advertising section 308 may fill the RD section of the Nextop-Address with all zeros. Also in this case, the advertising unit 308 may store the IP address (4 bytes or 16 bytes) of the gNB 130 in the IP address portion of the Nextop-Address. The advertisement part 308 specifies the offset as the Transposition of the SID Structure of the Prefix-SID attribute, the first bit position of the Argument part of the SID + the gNB address length, and 24 bits as the length, and indicates that the NLRI label part is the SID Argument. You can

Advertisement section 308, in the Prefix-SID attribute, the Locator of the SID corresponding to the conversion section 450 of SRGW 400 and in the Argument section following the Function section, the address of gNB 130 included in PFCP session 510 (in the case of GTP4.E) and QFI and RQI and TEID, the SID value written in advance is stored in GTP4. E or GTP6. may be stored as E. At this time, the advertising unit 308 may use any existing address family. Advertising unit 308 may store the IP prefix containing the UE address of UE 40 and the IP address of gNB 130 included in PFCP session 510 in the NLRI and Nextop-Address, respectively, in the MP_REACH_NLRI attribute, but not the TEID. you can

PE router 50 with VRF 220 housing DN 30 may receive the AD route directly from SRGW 400 . The N4BGPC 300 may advertise the UE 40 route advertised to the PE router 50 without adding the SID of the SRGW 400 corresponding to the UE 40 . At this time, the PE router 50 may associate the UE path received from the N4BGPC 300 with the SID addressed to the UE 40 included in the AD path received from the SRGW 400 .

The PE router 50 having the VRF 220 that accommodates the DN 30 may associate the SID of the AD path that has the same color community as the color community of the path of the UE 40 with the SID addressed to the UE 40 .

PE router 50 with VRF 220 accommodating DN 30 may receive the AD route directly from SRGW 400 if N4BGPC 300 stores the IP address of gNB 130 in MP_REACH_NLRI of UE 40 route. At this time, the N4BGPC 300 may advertise the UE 40 route advertised to the PE router 50 without adding the SID of the SRGW 400 corresponding to the UE 40 . At this time, the PE router 50 may associate the UE path received from the N4BGPC 300 with the SID addressed to the UE 40 included in the AD path received from the SRGW 400 .

The PE router 50 writes the gNB 130 address, QFI and RQI, and TEID included in the UE path received from the N4BGPC 300 to the Argument part of the SID included in the AD path, and uses it to transfer packets addressed to the IP prefix of the UE 40. SID may be updated.

When the AD route including the IP address of gNB 130 from SRGW 400 disappears, PE router 50 having VRF 220 accommodating DN 30 may autonomously delete it without waiting for the UE 40 route deletion advertisement from N4BGPC 300 . The PE router 50 may delete all UE routes other than the UE 40 that are maintained by the lost AD route without waiting for the route deletion advertisement from the N4BGPC 300 .

The PE router 50 determines that the AD route including the IP address of the gNB 130 from the SRGW 400 is lost, or that the AD route advertised by the SRGW other than the SRGW 400 is optimal as the AD route of the route information of the UE 40. If so, the SID addressed to UE 40 may be associated autonomously with the SID of the optimal AD route without waiting for the UE 40 route update advertisement from N4BGPC 300 . Optimal determination of the AD route may be made, for example, by longest prefix match through the Patricia tree.

The PE router 50 may comprise an ADRDB for searching AD routes received from the SRGW 400 . The ADRDB in PE router 50 may be a routing table. The ADRDB routing table may be the PE router 50 global routing table. Alternatively, the ADRDB may be the VRF that imported the AD route according to the value of the community attribute attached to the AD route. The PE router 50 evaluates the value of the community attribute added to the AD route based on the community attribute that differs for each group of gNBs 130 registered in advance, and imports the AD route into the ADRDB. good.

FIG. 6 schematically shows an example of another configuration of the communication system 10. As shown in FIG. The communication system 10 illustrated in FIG. 6 comprises an N4BGPC600. Communication system 10 further comprises VRF 210 and VRF 230 . VRF 210 may be an example of a first node. VRF 230 may be an example of a second node.

When connected to gNB 130, VRF 210 includes the address of gNB 130 in EP of NLRI, slice identification information that can identify a slice in color of NLRI, and SR policy including SID corresponding to the slice in BSID to N4BGPC 600. It comprises an SR policy transmitter for transmitting.

When connected to the UPF 120, the VRF 230 includes an SR policy that includes the address of the UPF 120 in the NLRI EP, the slice identification information that can identify the slice in the NLRI color, and the SID corresponding to the slice in the BSID. It has an SR policy transmission unit that transmits to N4BGPC600.

The N4BGPC 600 includes a linking information storage unit that stores linking information linking network instances and colors. A network instance corresponds to a slice. The linking information is registered in advance by, for example, an operator or administrator of the communication system 10 .

The N4BGPC 600 uses the color of the advertised information as a key to search the associated information storage unit to identify the network instance corresponding to the color, and the gNB address and UPF address corresponding to the identified network instance. , generates a gNB route and advertises it to the VRF 230 corresponding to the UPF 120 , and generates a UPF 120 route and advertises it to the VRF 210 corresponding to the gNB 130 .

FIG. 7 schematically shows an example of the hardware configuration of computer 1200 that functions as N4BGPC300, SRGW400, N4BGPC600, or PE router 700. In FIG. Programs installed on the computer 1200 cause the computer 1200 to function as one or more "parts" of the apparatus of the present embodiments, or cause the computer 1200 to operate or perform operations associated with the apparatus of the present invention. Multiple "units" can be executed and/or the computer 1200 can be caused to execute the process or steps of the process according to the present invention. Such programs may be executed by CPU 1212 to cause computer 1200 to perform certain operations associated with some or all of the blocks in the flowcharts and block diagrams described herein.

Computer 1200 according to this embodiment includes CPU 1212 , RAM 1214 , and graphics controller 1216 , which are interconnected by host controller 1210 . Computer 1200 also includes input/output units such as communication interface 1222 , storage device 1224 , DVD drive, and IC card drive, which are connected to host controller 1210 via input/output controller 1220 . The DVD drive may be a DVD-ROM drive, a DVD-RAM drive, and the like. Storage devices 1224 may be hard disk drives, solid state drives, and the like. Computer 1200 also includes legacy input/output units, such as ROM 1230 and keyboard, which are connected to input/output controller 1220 via input/output chip 1240 .

The CPU 1212 operates according to programs stored in the ROM 1230 and RAM 1214, thereby controlling each unit. Graphics controller 1216 retrieves image data generated by CPU 1212 into a frame buffer or the like provided in RAM 1214 or itself, and causes the image data to be displayed on display device 1218 .

Communication interface 1222 communicates with other electronic devices over a network. Storage device 1224 stores programs and data used by CPU 1212 within computer 1200 . The DVD drive reads programs or data from a DVD-ROM or the like and provides them to the storage device 1224 . The IC card drive reads programs and data from IC cards and/or writes programs and data to IC cards.

ROM 1230 stores therein programs that are dependent on the hardware of computer 1200, such as a boot program that is executed by computer 1200 upon activation. Input/output chip 1240 may also connect various input/output units to input/output controller 1220 via USB ports, parallel ports, serial ports, keyboard ports, mouse ports, and the like.

The program is provided by a computer-readable storage medium such as DVD-ROM or IC card. The program is read from a computer-readable storage medium, installed in storage device 1224 , RAM 1214 , or ROM 1230 , which are also examples of computer-readable storage media, and executed by CPU 1212 . The information processing described within these programs is read by computer 1200 to provide coordination between the programs and the various types of hardware resources described above. An apparatus or method may be configured by implementing information operations or processing according to the use of computer 1200 .

For example, when communication is performed between the computer 1200 and an external device, the CPU 1212 executes a communication program loaded into the RAM 1214 and sends communication processing to the communication interface 1222 based on the processing described in the communication program. you can command. The communication interface 1222 reads transmission data stored in a transmission buffer area provided in a recording medium such as a RAM 1214, a storage device 1224, a DVD-ROM, or an IC card under the control of the CPU 1212, and transmits the read transmission data. Data is transmitted to the network, or received data received from the network is written in a receive buffer area or the like provided on the recording medium.

In addition, the CPU 1212 causes the RAM 1214 to read all or necessary portions of files or databases stored in an external recording medium such as a storage device 1224, a DVD drive (DVD-ROM), an IC card, etc. Various types of processing may be performed on the data. CPU 1212 may then write back the processed data to an external recording medium.

Various types of information, such as various types of programs, data, tables, and databases, may be stored on recording media and subjected to information processing. CPU 1212 performs various types of operations on data read from RAM 1214, information processing, conditional decisions, conditional branching, unconditional branching, and information retrieval, which are described throughout this disclosure and are specified by instruction sequences of programs. Various types of processing may be performed, including /replace, etc., and the results written back to RAM 1214 . In addition, the CPU 1212 may search for information in a file in a recording medium, a database, or the like. For example, when a plurality of entries each having an attribute value of a first attribute associated with an attribute value of a second attribute are stored in the recording medium, the CPU 1212 selects the first attribute from among the plurality of entries. search for an entry that matches the specified condition of the attribute value of the attribute, read the attribute value of the second attribute stored in the entry, and thereby determine the first attribute that satisfies the predetermined condition An attribute value of the associated second attribute may be obtained.

The programs or software modules described above may be stored in a computer-readable storage medium on or near computer 1200 . Also, a recording medium such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer-readable storage medium, whereby the program can be transferred to the computer 1200 via the network. offer.

The blocks in the flowcharts and block diagrams in this embodiment may represent steps in the process in which the operations are performed or "parts" of the apparatus responsible for performing the operations. Certain steps and "sections" may be provided with dedicated circuitry, programmable circuitry provided with computer readable instructions stored on a computer readable storage medium, and/or computer readable instructions provided with computer readable instructions stored on a computer readable storage medium. It may be implemented by a processor. Dedicated circuitry may include digital and/or analog hardware circuitry, and may include integrated circuits (ICs) and/or discrete circuitry. Programmable circuits, such as Field Programmable Gate Arrays (FPGAs), Programmable Logic Arrays (PLAs), etc., perform AND, OR, EXCLUSIVE OR, NOT AND, NOT OR, and other logical operations. , flip-flops, registers, and memory elements.

A computer-readable storage medium may comprise any tangible device capable of storing instructions to be executed by a suitable device, such that a computer-readable storage medium having instructions stored thereon may be illustrated in flowchart or block diagram form. It will comprise an article of manufacture containing instructions that can be executed to create means for performing specified operations. Examples of computer-readable storage media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, and the like. More specific examples of computer readable storage media include floppy disks, diskettes, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory) , electrically erasable programmable read only memory (EEPROM), static random access memory (SRAM), compact disc read only memory (CD-ROM), digital versatile disc (DVD), Blu-ray disc, memory stick , integrated circuit cards, and the like.

The computer readable instructions may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state configuration data, or instructions such as Smalltalk, JAVA, C++, etc. any source or object code written in any combination of one or more programming languages, including object-oriented programming languages, and conventional procedural programming languages such as the "C" programming language or similar programming languages; may include

Computer readable instructions are used to produce means for a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, or programmable circuits to perform the operations specified in the flowchart or block diagrams. A general purpose computer, special purpose computer, or other programmable data processor, locally or over a wide area network (WAN) such as the Internet, etc., to execute such computer readable instructions. It may be provided in the processor of the device or in a programmable circuit. Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers, and the like.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. It is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

The execution order of each process such as actions, procedures, steps, and stages in the devices, systems, programs, and methods shown in the claims, the specification, and the drawings is etc., and it should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the specification, and the drawings, even if the description is made using "first," "next," etc. for convenience, it means that it is essential to carry out in this order. not a thing

10 communication system, 20 SRNW, 30 DN, 40 UE, 41 SID, 50 PE router, 110 SMF, 120 UPF, 130, 132, 133, 134 gNB, 202, 204, 206, 208, 210, 211, 212, 213 , 214, 220, 230 VRF, 222 SID, 300 N4BGPC, 302 generation unit, 304 notification unit, 306 storage unit, 308 advertisement unit, 310 acquisition unit, 320 ADRDB, 400 SRGW, 410 conversion unit, 450 conversion unit, 452 packet Conversion unit, 454 SR policy storage unit, 456 packet transfer unit, 458 advertisement control unit, 460 notification unit, 500 SR policy, 510 PFCP session, 600 N4BGPC, 700 PE router, 1200 computer, 1210 host controller, 1212 CPU, 1214 RAM , 1216 graphic controller, 1218 display device, 1220 input/output controller, 1222 communication interface, 1224 storage device, 1230 ROM, 1240 input/output chip

Claims (20)

a controller;
an SR gateway that converts SRv6 compliant packets received from an IP network into GTP-U compliant packets,
The SR gateway is
an AD route, wherein a BGP attribute of the AD route contains the SID of the SR gateway, and an NLRI of the AD route contains an IP prefix containing the address of the connected gNB. - A notification unit that notifies the router connected to the controller and the IP network of the D route;
The controller is
a storage unit that associates and stores an IP prefix including the address of the gNB and the SID of the SR gateway;
An advertising unit that searches the storage unit using the gNB address included in the PFCP session notified when the UE is attached as a key, and advertises the route information of the UE to the router when there is a match. a communication system; The notifying unit notifies the controller and the router of the AD route , including the IP prefix including the address of the gNB connected to the EP of the NLRI, according to claim 1 Communications system. The advertising unit adds a community attribute imported by the router to the route information of the UE so that the router receives the route information of the UE and registers a route to the UE in a routing table of the router. 3. The communication system according to claim 1 or 2, wherein the router is advertised to the router. 4. The communication system according to claim 3, wherein said advertising unit adds said community attribute, which is included in said PFCP session and differs for each core network instance, to said route information of said UE. The communication system according to claim 3 or 4, wherein the advertising unit adds the community attribute, which is included in the PFCP session and differs for each group of the gNBs, to the route information of the UE. The advertising unit uses the IP prefix including the address of the UE included in the PFCP session, the IP address of the gNB, the TEID, and the QFI and RQI as the route information of the UE, and the NLRI and Nexthop in the MP_REACH_NLRI attribute. - A communication system according to any one of claims 1 to 5, stored in at least one of the Addresses. When the NLRI is of the VPNv4 Unicast or VPNv6 Unicast address family, in the Nextop-Address, the 4-byte TEID, the 1-byte QFI and RQI, and the 3-byte Store in the order of zero, or in the order of 3 bytes of zero, 4 bytes of the TEID, 1 byte of the QFI and RQI, the IP address of the gNB in the IP address part of the Nextop-Address, and the NLRI 7. The communication system according to claim 6, wherein said TEID, said QFI and said RQI are not stored in . When the effective bit length of the TEID is 16 bits or less, and when the NLRI is of the VPNv4 Unicast or VPNv6 Unicast address family, the advertisement part stores 1-byte QFI and RQI in the 24-bit length label part of the NLRI, and The communication system according to claim 6, wherein the 2-byte TEID is stored, the RD part of the Nextop-Address is filled with all zeros, and the IP address of the gNB is stored in the IP address part of the Nextop-Address. . The advertising unit includes, in the Prefix-SID attribute, the Locator of the SID corresponding to the conversion unit of the SR gateway and the Argument unit following the Function unit, the IP address of the gNB included in the PFCP session, QFI and RQI, TEID and the previously written SID value as GTP4. E or GTP6. E, and store the IP prefix containing the address of the UE involved in the PFCP session and the IP address of the gNB in the NLRI and Nextop-Address, respectively, in the MP_REACH_NLRI attribute, but not the TEID, claim Item 6. The communication system according to any one of Items 1 to 5. The communication system according to any one of claims 1 to 9, wherein the notification unit notifies the controller of the AD path including slice identification information capable of identifying a slice corresponding to the UE in a color attribute. . further comprising the router;
11. The router autonomously deletes the AD route including the address of the gNB without waiting for the route deletion advertisement of the UE from the controller when the AD route including the address of the gNB is lost. 1. A communication system according to claim 1. the router autonomously deletes all UE paths other than the UE held by the lost AD path without waiting for route deletion advertisements from the controller; A communication system according to claim 11. further comprising the router;
When the AD route including the address of the gNB is lost, and the AD route advertised by the SR gateway other than the SR gateway is the optimal AD route as the AD route of the route information of the UE. In at least one of the cases determined to be the case, autonomously linking the SID destined for the UE with the SID of the optimal AD path without waiting for the UE route update advertisement of the UE from the controller. A communication system according to any one of claims 1 to 10, wherein further comprising the router;
11. The router according to any one of claims 1 to 10, wherein said router is an ADRDB for searching AD routes received from said SR gateway, and comprises a routing table ADRDB. communication system. 15. The communication system according to claim 14, wherein said ADRDB is said router's global routing table. 15. The communication system according to claim 14, wherein said ADRDB is a VRF that imported said AD route according to the value of a community attribute attached to said AD route. The router is
Based on community attributes that differ for each gBN group registered in advance, the value of the community attribute added to the AD route is evaluated, and the AD route is imported into the ADRDB. 17. The communication system according to 16. from an SR gateway that converts SRv6 compliant packets received from an IP network into GTP-U compliant packets , an AD route, wherein a BGP attribute of the AD route includes the SID of the SR gateway; a receiving unit that receives notification information that notifies the AD route , including an IP prefix that includes the address of the gNB connected to the SR gateway, in the NLRI of the AD route;
a storage unit that associates and stores an IP prefix including the address of the gNB and the SID of the SR gateway;
The storage unit is searched using the gNB address included in the PFCP session notified when the UE is attached as a key, and if a match is found, the route information of the UE is advertised to a router connected to the IP network. A controller comprising an advertising portion that performs and . A program for causing a computer to function as the controller according to claim 18. from an SR gateway that converts SRv6 compliant packets received from an IP network into GTP-U compliant packets , an AD route, wherein a BGP attribute of the AD route includes the SID of the SR gateway; a receiving step of receiving notification information notifying an AD route that includes an IP prefix that includes an address of a connected gNB to the NLRI of the AD route;
a storage step of associating the IP prefix including the address of the gNB with the SID of the SR gateway and storing the same in a storage unit;
The storage unit is searched using the gNB address included in the PFCP session notified when the UE is attached as a key, and if a match is found, the route information of the UE is advertised to a router connected to the IP network. A method of processing information, comprising:

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