# US 8,787,226 B2 · Method, apparatus and system for handling node failure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,226 B2 - Document ID: US8787226B2 - Status: Granted - Kind: B2 - Application number: 13/666,225 - Filed: 2012-11-01 - Published: 2013-03-07 - Granted: 2014-07-22 - Earliest claimed: 2010-01-27 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yu Yin; Caixia Qi - Web page: https://patentgrep.com/patent/US8787226B2 ## CPC - H04W 24/04: Arrangements for maintaining operational condition - H04L 45/28: using route fault recovery - H04W 92/24: between backbone network devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Embodiments of the present invention provide a method, an apparatus and a system for handling node failure. The method for handling node failure includes: sending, by an intermediate node, a context processing request message to a remote node when detecting that a first node occurs a failure, where the context processing request message is used to instruct the remote node to delete context information associated with the first node and the intermediate node; and deleting the context information associated with the first node and the intermediate node, by the remote node, according to the request message. The technical solution can enable the remote node to process the context information associated with the first node in time ## Claims ### Claim 1 A method for handling node failure, comprising: detecting, by a serving gateway (SGW), that a packet data gateway (PGW) has restarted; obtaining, by the SGW, a first match word, according to a packet data network connection set identifier (CSID) mask of the PGW and a CSID of the PGW in context information associated with the PGW stored in the SGW; sending, by the SGW a context processing request message carrying the CSID mask of the PGW, the first match word, an internet protocol (IP) address of the PGW and an IP address of the SGW, to a mobility management entity (MME); wherein the MME obtains a second match word, according to the CSID mask of the PGW and a CSID of the PGW in context information corresponding to the IP address of the PGW and the IP address of the SGW stored in the MME, and the MME deletes context information when the first match word matches the second match word in the MME. ### Claim 2 (depends on 1) The method according to claim 1, wherein the context processing request message is a general packet radio service (GPRS) tunneling protocol (GTP) message. ### Claim 3 (depends on 2) The method according to claim 2, wherein the GTP message is a deletion request message. ### Claim 4 (depends on 3) The method according to claim 3, wherein the deletion request message includes: a delete bearer request message, a delete packet data network (PDN) connection set request message or a delete session request message. ### Claim 5 (depends on 1) The method according to claim 1, further comprising: obtaining and storing, by the SGW, the CSID mask of the PGW from a message sent by the PGW in a process of initial communication between the SGW and the PGW. ### Claim 6 (depends on 1) The method according to claim 1, wherein detecting, by the SGW, that the PGW has restarted, comprises: receiving, by the SGW, a GTP message sent by the PGW which carries a restart counter; detecting, by the SGW, that the PGW has restarted if a count value of the restart counter carried in the message is different from a count value of a restart counter of the PGW in the SGW. ### Claim 7 A method for handling node failure, comprising: receiving, by a mobility management entity (MME), a context processing request message carrying a packet data network connection set identifier CSID mask of a packet data gateway (PGW), a first match word, an internet protocol (IP) address of the PGW and an IP address of a serving gateway (SGW) from the SGW when the SGW detects that the PGW has restarted; obtaining, by the MME, a second match word, according to the CSID mask of the PGW and a CSID of the PGW in context information corresponding to the IP address of the PGW and the IP address of the SGW stored in the MME; and deleting, by the MME, context information when the first match word matches the second match word in the MME. ### Claim 8 (depends on 7) The method according to claim 7, wherein the context processing request message is a general packet radio service (GPRS) tunneling protocol (GTP) message. ### Claim 9 (depends on 8) The method according to claim 8, wherein the GTP message is a deletion request message. ### Claim 10 (depends on 9) The method according to claim 9, wherein the deletion request message includes: a delete bearer request message, a delete PDN connection set request message or a delete session request message. ### Claim 11 A serving gateway (SGW), comprising: a processor, configured to detect that a packet data gateway (PGW) has restarted and obtain a first match word according to a packet data network connection set identifier (CSID) mask of the PGW and a CSID of the PGW in context information associated with the PGW stored in the SGW; and a transmitter, configured to send a context processing request message carrying the CSID mask of the PGW, the first match word, an internet protocol (IP) address of the PGW and an IP address of the SGW to a mobility management entity (MME); wherein the MME obtains a second match word, according to the CSID mask of the PGW and a CSID of the PGW in context information corresponding to the IP address of the PGW and the IP address of the SGW stored in the MME, and the MME deletes context information when the first match word matches the second match word in the MME. ### Claim 12 (depends on 11) The SGW according to claim 11, wherein the context processing request message is a general packet radio service (GPRS) tunneling protocol (GTP) message. ### Claim 13 (depends on 12) The SGW according to claim 12, wherein the GTP message is a deletion request message. ### Claim 14 (depends on 13) The SGW according to claim 13, wherein the deletion request message includes: a delete bearer request message, a delete PDN connection set request message or a delete session request message. ### Claim 15 (depends on 11) The SGW according to claim 11, further comprising: a CSID mask storage, configured to obtain and store the CSID mask of the PGW from a message sent by the PGW in a process of initial communication between the SGW and the PGW. ### Claim 16 A mobility management entity (MME), comprising: a receiver, configured to receive a context processing request message carrying a packet data network connection set identifier (CSID) mask of a packet data gateway (PGW), a first match word, an internet protocol (IP) address of the PGW and an IP address of a serving gateway (SGW) from the SGW when the SGW detects that the PGW has restarted; and a processor, configured to obtain a second match word according to the CSID mask of the PGW and a CSID of the PGW in context information corresponding to the IP address of the PGW and the IP address of the SGW stored in the MME, and delete context information when the first match word matches the second match word in the MME. ### Claim 17 (depends on 16) The MME according to claim 16, wherein the context processing request message is a general packet radio service (GPRS) tunneling protocol (GTP) message. ### Claim 18 (depends on 17) The MME according to claim 17, wherein the GTP message is a deletion request message. ### Claim 19 (depends on 18) The MME according to claim 18, wherein the deletion request message includes: a delete bearer request message, a delete PDN connection set request message or a delete session request message.