# US 2008/0188223 A1 · Method, a system and a network element for performing a handover of a mobile equipment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0188223 A1 - Document ID: US20080188223A1 - Status: Published application - Kind: A1 - Application number: 11/878,459 - Filed: 2007-07-24 - Published: 2008-08-07 - Earliest claimed: 2007-02-07 - Assignees: Nokia Corporation - Inventors: Seppo Vesterinen; Mika Kauranen; Sami Kekki - Web page: https://patentgrep.com/patent/US20080188223A1 ## CPC - H04W 36/02: Buffering or recovering information during reselection {; Modification of the traffic flow during hand-off} - H04W 36/1443: {between licensed networks} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method, a system and a network element for performing a handover of a mobile equipment from a source network to a target network in a mobile telecommunication system, wherein data, which may be transferred via the source network to the mobile equipment when it is linked to the source network, are going to be buffered in a network element in case a need for a handover arises, and the data buffered in the network element are forwarded from the network element to the target network for transferring them to the mobile equipment after it has been linked to the target network. ## Claims ### Claim 1 A method to perform a handover of a mobile equipment from a source network to a target network in a mobile telecommunication system, the method comprising: data; buffering data which may be transferred via the source network to the mobile equipment when the mobile equipment is linked to the source network, in a network element when a need for a handover arises; and forwarding the data buffered in the network element from the network element to the target network for transferring the data to the mobile equipment after the mobile equipment has been linked to the target network. ### Claim 2 (depends on 1) The method according to claim 1, wherein the network element starts buffering only the data that cannot be transferred to the mobile equipment via the source network anymore after the mobile equipment has detached from the source network. ### Claim 3 (depends on 1) The method according to claim 1, further comprising: buffering the received data at the target network until the mobile equipment is linked to the target network. ### Claim 4 (depends on 3) The method according to claim 3, further comprising: buffering the received data at a node in the target network. ### Claim 5 (depends on 1) The method according to claim 1, further comprising: terminating the buffering of the data by the network element after the mobile equipment has been linked to the target network. ### Claim 6 (depends on 1) The method according to claim 1, further comprising: receiving further new data by the target network in addition to the data buffered in the network element. ### Claim 7 (depends on 6) The method according to claim 6, further comprising: forwarding the further new data to the target network after the data buffered in the network element have been forwarded to the target network. ### Claim 8 (depends on 1) The method according to claim 1, further comprising: buffering the data to be transferred to the mobile equipment in the source network; and when older undelivered data are still buffered in the source network, postponing the handover until the older data buffered in the source network are transferred to the mobile equipment still linked to the source network. ### Claim 9 (depends on 8) The method according to claim 8, further comprising: buffering the data at a node in the source network. ### Claim 10 (depends on 1) The method according to claim 1, wherein the data are downlink user data. ### Claim 11 (depends on 1) The method according to claim 1, wherein the source network is a network of a first kind and the target network is a network of a second kind. ### Claim 12 (depends on 11) The method according to claim 11, wherein the source network is a LTE (long term evolution) network and the target network is a 2G (second generation) network. ### Claim 13 (depends on 11) The method according to claim 11, wherein the source network is a LTE network and the target network is a 3G (third generation) network. ### Claim 14 (depends on 11) The method according to claim 11, wherein the source network is a 3G network and the target network is a (long term evolution) LTE network. ### Claim 15 (depends on 11) The method according to claim 11, wherein the source network is a 2G network and the target network is a (long term evolution) LTE network. ### Claim 16 (depends on 11) The method according to claims 11, wherein the source network is a HSPA (high speed, packet access) network and target network is a (long term evolution) LTE network. ### Claim 17 A system to perform a handover of a mobile equipment from a source network to a target network in a mobile telecommunication system, comprising: a network element comprising a buffer configured to buffer data for a handover, wherein the data may be transferred via the source network to the mobile equipment when the mobile equipment is linked to the source network; and an interface operatively connected between the network element and the target network configured to forward the data buffered in the buffer of the network element from the network element to the target network to transfer the data to the mobile equipment after the mobile equipment has been linked to the target network. ### Claim 18 (depends on 17) The system according to claim 17, wherein the buffer of the network element starts buffering only the data that cannot be transferred to the mobile equipment via the source network anymore after the mobile equipment has detached from the source network. ### Claim 19 (depends on 17) The system according to claim 17, wherein the target network comprises a buffer configured to buffer the data received until the mobile equipment is linked to the target network. ### Claim 20 (depends on 19) The system according to claim 19, wherein a node in the target network comprises the buffer configured to buffer the received data to be transferred to the mobile equipment. ### Claim 21 (depends on 17) The system according to claim 17, wherein the buffer of the network element is configured to terminate the buffering of the data after the mobile equipment has been linked to the target network. ### Claim 22 (depends on 17) The system according to claim 17, wherein the target network comprises a receiver configured to receive further new data in addition to the data buffered in the buffer of the network element. ### Claim 23 (depends on 22) The system according to claim 22, wherein the receiver is configured to receive the further new data after the data buffered in the buffer of the network element have been received. ### Claim 24 (depends on 17) The system according to claim 17, wherein the source network comprises a buffer configured to buffer the data to be transferred to the mobile equipment, and a transmitter configured to transfer the data to the mobile equipment, wherein the network element is configured to postpone the handover in case older undelivered data are still buffered in the buffer of the source network until the transmitter of the source network has transferred the older data buffered in the buffer of the source network to the mobile equipment still linked to the source network. ### Claim 25 (depends on 24) The system according to claim 24, wherein a node in the source network comprises the buffer configured to buffer the data received from the network element. ### Claim 26 (depends on 17) The system according to claim 17, wherein the data are downlink user data. ### Claim 27 (depends on 17) The system according to claim 17, wherein the source network is a network of a first kind and the target network is a network of a second kind. ### Claim 28 (depends on 27) The system according to claim 27, wherein the source network is a LTE (long term evolution) network and the target network is a 2G (second generation) network. ### Claim 29 (depends on 27) The system according to claim 27, wherein the source network is a LTE (long term evolution) network and the target network is a 3G (third generation) network. ### Claim 30 (depends on 27) The system according to claim 27, wherein the source network is a 3G (third generation) network and the target network is a LTE (long term evolution) network. ### Claim 31 (depends on 27) The system according to claim 27, wherein the source network is a 2G (second generation) network and the target network is a LTE (long term evolution) network. ### Claim 32 (depends on 27) The system according to claims 27, wherein the source network is a HSPA (high speed packet access) network and target network is a LTE (long term evolution) network. ### Claim 33 A network element to perform a handover of a mobile equipment from a source network to a target network in a mobile telecommunication system, comprising: a buffer configured to buffer data for a handover, wherein the data may be transferred via the source network to the mobile equipment when the mobile equipment is linked to the source network; and a transmitter configured to forward the data buffered in the buffer to the target network to transfer the data to the mobile equipment after the mobile equipment has been linked to the target network. ### Claim 34 (depends on 33) The network element according to claim 33, wherein the buffer starts buffering only the data that cannot be transferred to the mobile equipment via the source network anymore after the mobile equipment has detached from the source network. ### Claim 35 (depends on 33) The network element according to claim 33, wherein the buffer is configured to terminate the buffering of the data after the mobile equipment has been linked to the target network. ### Claim 36 (depends on 33) The network element according to claim 33, wherein the data are downlink user data. ### Claim 37 (depends on 33) The network element according to claim 33, wherein the source network is a network of a first kind and the target network is a network of a second kind. ### Claim 38 (depends on 37) The network element according to claim 37, wherein the source network is a LTE (long term evolution) network and the target network is a 2G (second generation) network. ### Claim 39 (depends on 37) The network element according to claim 37, wherein the source network is a LTE network and the target network is a 3G (third generation) network. ### Claim 40 (depends on 37) The network element according to claim 37, wherein the source network is a 3G network and the target network is a LTE (long term evolution) network. ### Claim 41 (depends on 37) The network element according to claim 37, wherein the source network is a 2G network and the target network is a LTE (long term evolution) network. ### Claim 42 (depends on 37) The network element according to claim 37, wherein the source network is a HSPA (high speed packet access) network and target network is a LTE (long term evolution) network. ### Claim 43 A system for performing a handover of a mobile equipment from a source network to a target network in a mobile telecommunication system, comprising: network element means comprising buffer means for buffering data for a handover, wherein the data may be transferred via the source network to the mobile equipment when the mobile equipment is linked to the source network; and interface means operatively connected between the network element and the target network for forwarding the data buffered in the buffer of the network element from the network element to the target network for transferring the data to the mobile equipment after the mobile equipment has been linked to the target network. ### Claim 44 A network element for performing a handover of a mobile equipment from a source network to a target network in a mobile telecommunication system, comprising: buffer means for buffering data for a handover, wherein the data may be transferred via the source network to the mobile equipment when the mobile equipment is linked to the source network; and transmitter means for forwarding the data buffered in the buffer to the target network for transferring the data to the mobile equipment after the mobile equipment has been linked to the target network.