# US 9,521,103 B2 · Method, apparatus, and system for notifying and learning address information invalidation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,103 B2 - Document ID: US9521103B2 - Status: Granted - Kind: B2 - Application number: 13/848,375 - Filed: 2013-03-21 - Published: 2013-10-17 - Granted: 2016-12-13 - Earliest claimed: 2012-03-21 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Hong Li - Web page: https://patentgrep.com/patent/US9521103B2 ## CPC - H04L 51/48: Message addressing, e.g. address format or anonymous messages, aliases - H04W 76/30: Connection release - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present invention discloses a method, an apparatus, and a system for notifying and learning address information invalidation. The present invention includes: receiving, by a mobile device, a first notification message that indicates release of a default bearer and is sent by a core network, where the first notification message includes a first default bearer that is allocated to the mobile device and already released by the core network; determining, by the mobile device and according to the first default bearer, address information corresponding to the first default bearer; and sending, by the mobile device and to a terminal device, a second notification message indicating address information invalidation, where the second notification message includes the address information invalidation indication information and the address information corresponding to the first default bearer, so that the terminal device deletes the address information corresponding to the first default bearer. ## Claims ### Claim 1 A method for notifying address information invalidation, comprising: a user terminal device communicating to a core network through a mobile device, wherein the user terminal differs in functions from the mobile device; receiving by the mobile device from the core network, a first notification message that indicates release of a default bearer, the first notification message comprises a first default bearer which is both allocated to the mobile device, and has been released by the core network; determining by the mobile device, address information corresponding to the first default bearer; and sending by the mobile device to a user terminal device, a second notification message which indicates address information invalidation, wherein the second notification message comprises address information invalidation indication information and the address information which corresponds to the first default bearer; wherein in response to receiving the second notification message from the mobile device, the user terminal device deletes the received address information corresponding to the first default bearer according to the address information invalidation indication information which is comprised in the second notification message. ### Claim 2 (depends on 1) The method according to claim 1, wherein the sending to the user terminal device, the second notification message indicating address information invalidation, comprises the mobile device performing: bearing the second notification message in a protocol packet, and sending the protocol packet which bears the second notification message to the user terminal device. ### Claim 3 (depends on 2) The method according to claim 2, wherein the protocol packet is one of: a dynamic host configuration protocol no acknowledgement (DHCP NAK) packet, or an Internet message control protocol router advertisement (ICMPv6 RA) packet; wherein: when the address information corresponding to the first default bearer is of an Internet protocol version 4 (IPv4) type, the protocol packet is the DHCP NAK packet; and when the address information corresponding to the first default bearer is of an Internet protocol version 6 IPv6 type, the protocol packet is the ICMPv6 RA packet. ### Claim 4 (depends on 3) The method according to claim 3, wherein the second notification message further comprises: when the address information corresponding to the first default bearer is of the IPv4 type: the address information invalidation indication information is borne in a second high bit of a flag flags field in the DHCP NAK packet, and the address information corresponding to the first default bearer is borne in a client IP address yiaddr field in the DHCP NAK packet; and when the address information corresponding to the first default bearer is of the IPv6 type: the address information invalidation indication information is borne in a first high bit of a first reserved Reserved1 field in prefix information Prefix Information of the ICMPv6 RA packet, and the address information corresponding to the first default bearer is borne in a prefix Prefix field in the ICMPv6 RA packet. ### Claim 5 A mobile device, comprising at least a processor coupled to a memory which stores program codes, wherein the processor executes the program codes in the memory to configure the mobile device to: facilitate a user terminal device's communication to a core network through the mobile device, wherein the user terminal differs in functions from the mobile device; receive from the core network, a first notification message which comprises a first default bearer which is both allocated to the mobile device and has already been released by the core network; determine address information corresponding to the first default bearer; and send to the user terminal device, a second notification message which indicates address information invalidation, wherein the second notification message comprises address information invalidation indication information and the address information which corresponds to the first default bearer; wherein the second notification message sent from the mobile device causes the user terminal device to delete the received address information corresponding to the first default bearer according to the address information invalidation indication information which is comprised in the second notification message. ### Claim 6 (depends on 5) The mobile device according to claim 5, wherein the mobile device is specifically configured to bear the second notification message in a protocol packet, and send the protocol packet which bears the second notification message to the terminal device. ### Claim 7 (depends on 6) The mobile device according to claim 6, wherein the protocol packet is one of: a DHCP NAK packet or an ICMPv6 RA packet; wherein: when the address information corresponding to the first default bearer is of an IPv4 type, the protocol packet is the DHCP NAK packet; and when the address information corresponding to the first default bearer is of an IPv6 type, the protocol packet is the ICMPv6 RA packet. ### Claim 8 (depends on 7) The mobile device according to claim 7, wherein that the second notification message comprises: when the address information corresponding to the first default bearer is of the IPv4 type: the address information invalidation indication information is borne in a second high bit of a flag flags field in the DHCP NAK packet, and the address information corresponding to the first default bearer is borne in a client IP address yiaddr field in the DHCP NAK packet; and when the address information corresponding to the first default bearer is of the IPv6 type: the address information invalidation indication information is borne in a first high bit of a first reserved Reserved1 field in prefix information Prefix Information of the ICMPv6 RA packet, and the address information corresponding to the first default bearer is borne in a prefix Prefix field in the ICMPv6 RA packet. ### Claim 9 A user terminal device, comprising at least a processor coupled to a memory which stores program codes, wherein the processor executes the program codes in the memory to configure the user terminal device to: communicate to a core network through a mobile device, wherein the user terminal differs in functions from the mobile device; receive a notification message sent by the mobile device, wherein the notification message was previously sent from the core network to the mobile terminal, and the notification message is used to indicate address information invalidation, and wherein the notification message comprises address information invalidation indication information and address information corresponding to a first default bearer, and wherein the first default bearer is a default bearer which is both allocated to the mobile device and has already been released by the core network; and delete the received address information corresponding to the first default bearer according to the address information invalidation indication information which is comprised in the notification message. ### Claim 10 (depends on 9) The user terminal device according to claim 9, wherein the user terminal device is further configured to: when the received notification message sent by the mobile device is a DHCP NAK packet that indicates the address information invalidation: parse the DHCP NAK packet to obtain the address information invalidation indication information and the address information corresponding to the first default bearer, wherein the address information invalidation indication information is borne in a second high bit in a flags field in the DHCP NAK packet, and the address information is borne in a yiaddr field in the DHCP NAK packet; and delete the address information corresponding to the first default bearer according to the address information invalidation indication information which is comprised in the notification message. ### Claim 11 (depends on 9) The user terminal device according to claim 9, wherein the user terminal device is further configured to: when the received notification message sent by the mobile device is an ICMPv6 RA packet that indicates the address information invalidation: parse the ICMPv6 RA packet to obtain the address information invalidation indication information and the address information corresponding to the first default bearer, wherein the address information invalidation indication information is borne in a first high bit in a Reserved1 field in Prefix Information of the ICMPv6 RA packet, and the address information is borne in a Prefix field in the ICMPv6 RA packet; and delete the address information corresponding to the first default bearer according to the parsed address information invalidation indication information.