# US 2025/0097782 A1 · Dual active protocol stack handover > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0097782 A1 - Document ID: US20250097782A1 - Status: Published application - Kind: A1 - Application number: 18/290,739 - Filed: 2022-08-01 - Published: 2025-03-20 - Earliest claimed: 2021-08-05 - Assignees: Nokia Technologies Oy - Applicants: Nokia Technologies - Inventors: Srinivasan SELVAGANAPATHY; Ahmad AWADA; Krzysztof KORDYBACH - Web page: https://patentgrep.com/patent/US20250097782A1 ## CPC - H04W 36/185: {using make before break} - H04W 36/0033: {with transfer of context information} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 36/0016: {Hand-off preparation specially adapted for end-to-end data sessions} - H04W 36/0079: {in case of hand-off failure or rejection} - H04W 36/08: Reselecting an access point - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract An apparatus comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: enabling dual active protocol stack, DAPS, handover, comprising: receiving DAPS handover configuration information comprising information indicating one or more bearers that are to be released; and maintaining the one or more bearers during a random-access procedure with a target access node. ## Claims ### Claim 1 An apparatus comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: enabling dual active protocol stack, DAPS, handover, comprising: receiving DAPS handover configuration information comprising information indicating one or more bearers that are to be released; and maintaining the one or more bearers during a random-access procedure with a target access node. ### Claim 2 (depends on 1) An apparatus as claimed in claim 1, wherein the DAPS handover configuration information comprises an indication that the one or more bearers are to be maintained during the random-access procedure with the target access node. ### Claim 3 (depends on 1) An apparatus as claimed in claim 1, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: releasing the one or more bearers after the random-access procedure with the target access node is completed. ### Claim 4 (depends on 3) An apparatus as claimed in claim 3, wherein releasing the one or more bearers comprises releasing one or more internal bearer configurations and/or resources and/or stopping transmission and/or reception on the one or more bearers. ### Claim 5 (depends on 1) An apparatus as claimed in claim 1, wherein maintaining the one or more bearers comprises maintaining one or more internal bearer configurations and/or resources and/or receiving and/or transmitting on the one or more bearers. ### Claim 6 (depends on 1) An apparatus as claimed in claim 1, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: if the DAPS handover fails, continuing transmission and/or reception on the one or more bearers. ### Claim 7 (depends on 6) An apparatus as claimed in claim 6, wherein continuing transmission and/or reception on the one or more bearers comprises maintaining one or more services on the one or more bearers. ### Claim at position 8 8-28. (canceled) ### Claim 29 An apparatus comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: supporting dual active protocol stack, DAPS, handover, comprising: receiving DAPS handover configuration information comprising information indicating one or more bearers that are to be released; and maintaining the one or more bearers after receipt of the DAPS handover configuration information. ### Claim 30 (depends on 29) An apparatus as claimed in claim 29, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: maintaining the one or more bearers until an indication of DAPS handover success is received. ### Claim 31 (depends on 29) An apparatus as claimed in claim 29, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: receiving an indication of DAPS handover success; and releasing the one or more bearers after receiving the indication. ### Claim 32 (depends on 29) An apparatus as claimed in claim 29, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: determining that delayed bearer release is to be used during a DAPS handover procedure. ### Claim 33 (depends on 29) An apparatus as claimed in claim 29, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: transmitting a DAPS handover request to a target node, the handover request comprising an indication that delayed bearer release is to be used. ### Claim 34 (depends on 29) An apparatus as claimed in claim 29, wherein the DAPS handover configuration information comprises an indication that the one or more bearers are to be maintained during a random-access procedure between a terminal node and a target access node. ### Claim 35 (depends on 29) An apparatus as claimed in claim 29, wherein the DAPS handover configuration information is received in a handover request acknowledgment, wherein the handover request acknowledgement is received in response to a DAPS handover request. ### Claim 36 (depends on 29) An apparatus as claimed in claim 29, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: amending the DAPS handover configuration information to include an indication that the one or more bearers are to be maintained during a random-access procedure between a terminal node and a target access node. ### Claim 37 (depends on 29) An apparatus as claimed in claim 29, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: transmitting the DAPS handover configuration information to at least one terminal node. ### Claim at position 18 38-64. (canceled) ### Claim 65 An apparatus comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: supporting dual active protocol stack, DAPS, handover, comprising: receiving a DAPS handover request comprising an indication that delayed bearer release is to be used; determining DAPS handover configuration information comprising information indicating one or more bearers that are to be released and an indication that the one or more bearers are to be maintained during a random-access procedure between a terminal node and a target access node; and transmitting the DAPS handover configuration information. ### Claim 66 (depends on 65) An apparatus as claimed in claim 65, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: determining the one or more bearers that are to be released. ### Claim 67 (depends on 65) An apparatus as claimed in claim 65, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform: transmitting an acknowledgement that DAPS handover configuration information is configured for delayed bearer release. ### Claim at position 22 68-70. (canceled) ### Claim 71 A computer program comprising instructions for causing an apparatus to perform: supporting dual active protocol stack, DAPS, handover, comprising: receiving a DAPS handover request comprising an indication that delayed bearer release is to be used; determining DAPS handover configuration information comprising information indicating one or more bearers that are to be released and an indication that the one or more bearers are to be maintained during a random-access procedure between a terminal node and a target access node; and transmitting the DAPS handover configuration information. ### Claim 72 (depends on 71) A computer program as claimed in claim 71, comprising instructions for causing an apparatus to perform: determining the one or more bearers that are to be released. ### Claim 73 (depends on 71) A computer program as claimed in claim 71, comprising instructions for causing an apparatus to perform: transmitting an acknowledgement that DAPS handover configuration information is configured for delayed bearer release. ### Claim at position 26 74-76. (canceled)