# US 2021/0243667 A1 · Signaling for target-initiated conditional handover modification via cancellation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243667 A1 - Document ID: US20210243667A1 - Status: Published application - Kind: A1 - Application number: 17/149,343 - Filed: 2021-01-14 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: Nokia Solutions and Networks Oy - Applicants: Nokia Solutions and Networks Oy - Inventors: Ahmad AWADA; . Krzysztof KORDYBACH; Jedrzej STANCZAK; Jean-Michel PUGEAT; Tero HENTTONEN; Ingo VIERING - Web page: https://patentgrep.com/patent/US20210243667A1 ## CPC - H04W 36/38: by fixed network equipment - H04W 36/08: Reselecting an access point - H04W 36/362: {Conditional handover} - H04L 25/028: {Arrangements specific to the transmitter end} - H04W 74/004: {in the uplink, i.e. towards network} - 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 A method may include receiving a request for conditional handover from a source node. The method may also include sending a conditional handover request acknowledgment message in response to the request. The method may further include sending a conditional handover cancellation message to a source node. The conditional cancellation message may include a genuine cancellation or a modification-related cancellation. Further, the method may include receiving a response message from the source node in response to the conditional handover cancellation message. In addition, the method may include deciding to keep or release user equipment context based on the response message. ## Claims ### Claim 1 A method comprising: receiving, by a source node, a conditional handover cancellation message from a target node, wherein the conditional handover cancellation message comprises an indication indicating modification-related cancellation for a user equipment, and wherein the indication comprises a cause value or an information element. ### Claim 2 (depends on 1) The method of claim 1, further comprising: determining, by the source node, whether or not to send a conditional handover request to the target node for providing an updated conditional handover command. ### Claim 3 (depends on 1) The method of claim 1, wherein the indication comprises at least one reason for the modification-related cancellation. ### Claim 4 (depends on 3) The method of claim 3, wherein the at least one reason comprises at least one of: one or more bearers cannot be supported, one or more packet data unit sessions cannot be supported, one or more new bearers previously rejected can be now supported, one or more packet data unit sessions previously rejected can be now support, and contention-free random access information change. ### Claim 5 (depends on 1) The method of claim 1, further comprising: sending a reconfiguration message to the user equipment, and wherein the reconfiguration message comprises an indicator indicating release of conditional handover command and/or configuration. ### Claim 6 (depends on 5) The method of claim 5, further comprising: determining, by the source node and in response to sending the reconfiguration message, whether an acknowledgement is received from the user equipment. ### Claim 7 (depends on 1) The method of claim 1, further comprising: sending a conditional handover cancel response message from the source node to the target node, wherein the response message comprises an indicator indicating whether the user equipment has successfully reconfigured and/or released conditional handover command. ### Claim 8 (depends on 1) The method of claim 1, further comprising: sending a conditional handover request message from the source node to the target node, and wherein the request message comprises an indicator indicating whether the user equipment has successfully reconfigured and/or released conditional handover command. ### Claim 9 An apparatus, comprising: one or more processors; and one or more memories including computer program code, the one or more memories and the computer program code configured, with the one or more processors, to cause the apparatus to at least: receive a conditional handover cancellation message from a target node, wherein the conditional handover cancellation message comprises an indication indicating modification-related cancellation for a user equipment, and wherein the indication comprises a cause value or an information element. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the apparatus is further caused to: determine whether or not to send a conditional handover request to the target node for providing an updated conditional handover command. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the indication comprises at least one reason for the modification-related cancellation. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the at least one reason comprises at least one of: one or more bearers cannot be supported, one or more packet data unit sessions cannot be supported, one or more new bearers previously rejected can be now supported, one or more packet data unit sessions previously rejected can be now support, and contention-free random access information change. ### Claim 13 (depends on 9) The apparatus of claim 9, wherein the apparatus is further caused to: send a reconfiguration message to the user equipment, and wherein the reconfiguration message comprises an indicator indicating release of conditional handover command and/or configuration. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the apparatus is further caused to: determine, in response to sending the reconfiguration message, whether an acknowledgement is received from the user equipment. ### Claim 15 (depends on 9) The apparatus of claim 9, wherein the apparatus is further caused to: send a conditional handover cancel response message to the target node, wherein the response message comprises an indicator indicating whether the user equipment has successfully reconfigured and/or released conditional handover command. ### Claim 16 (depends on 9) The apparatus of claim 9, wherein the apparatus is further caused to: send a conditional handover request message to the target node, and wherein the request message comprises an indicator indicating whether the user equipment has successfully reconfigured and/or released conditional handover command. ### Claim 17 An apparatus, comprising: one or more processors; and one or more memories including computer program code, the one or more memories and the computer program code configured, with the one or more processors, to cause the apparatus to at least: send, to a source node, a conditional handover cancellation message, wherein the conditional handover cancellation message comprises an indication indicating modification-related cancellation, and wherein the indication comprises a cause value or an information element. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the apparatus is further caused to: receive a conditional handover request from the source node for providing an updated conditional handover command. ### Claim 19 (depends on 17) The apparatus of claim 17, wherein the indication comprises at least one reason for the modification-related cancellation. ### Claim 20 (depends on 17) The apparatus of claim 17, wherein the apparatus is further caused to: receive a conditional handover cancel response message from the source node, wherein the response message comprises an indication indicating whether the user equipment has successfully reconfigured and/or released conditional handover command.