# US 12,004,020 B2 · Techniques for handling calls associated with user equipment transition from dual active mode to dual standby mode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,020 B2 - Document ID: US12004020B2 - Status: Granted - Kind: B2 - Application number: 17/457,127 - Filed: 2021-12-01 - Published: 2022-08-04 - Granted: 2024-06-04 - Earliest claimed: 2021-01-29 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Vikram Singh; Bhupesh Manoharlal Umatt; Carlos Marcelo Dias Pazos; Cherng-Shung Hsu; Qingxin Chen; Yong Xie - Web page: https://patentgrep.com/patent/US12004020B2 ## CPC - H04W 36/0022: {for transferring data sessions between adjacent core network technologies} - H04W 76/18: Management of setup rejection or failure - H04W 76/34: Selective release of ongoing connections - H04W 8/183: {Processing at user equipment or user record carrier} - H04W 60/005: {Multiple registrations, e.g. multihoming} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, while the UE is in an active session using a first radio access technology (RAT) associated with a first subscription of the UE, a call request via the first RAT, wherein the call request is associated with a second subscription of the UE. The UE may determine that the call request is received from a serving cell that is associated with fallback from the first RAT to a second RAT for calls. The UE may reject the call request or transition the second subscription to a third RAT based at least in part on the determination that the call request is received via the serving cell that is associated with fallback from the first RAT to the second RAT for calls. Numerous other aspects are described. ## Claims ### Claim 1 A method of wireless communication performed by a user equipment (UE), comprising: receiving, while the UE is in an active session using a first radio access technology (RAT) associated with a first subscription of the UE, a call request via the first RAT, wherein the call request is associated with a second subscription of the UE; searching a database that stores information indicating whether one or more cells of the first RAT are associated with fallback from the first RAT to a second RAT for calls; determining, based at least in part on searching the database, that the call request is received from a serving cell that is associated with fallback from the first RAT to the second RAT for calls; and rejecting the call request or transitioning the second subscription to a third RAT based at least in part on the determination that the call request is received via the serving cell that is associated with fallback from the first RAT to the second RAT for calls. ### Claim 2 (depends on 1) The method of claim 1, further comprising storing, in the database, an indication that the serving cell is associated with fallback from the first RAT to the second RAT for calls based at least in part on receiving a command to fall back from the first RAT to the second RAT on the serving cell. ### Claim 3 (depends on 1) The method of claim 1, further comprising updating the information stored in the database based at least in part on receiving updated information from one or more other devices. ### Claim 4 (depends on 1) The method of claim 1, further comprising transmitting an indication that the serving cell is associated with fallback from the first RAT to the second RAT for calls based at least in part on receiving a command to fall back from the first RAT to the second RAT on the serving cell. ### Claim 5 (depends on 1) The method of claim 1, further comprising: determining that the UE or the second subscription is not capable of supporting calls using the first RAT; and rejecting the call request or transitioning the second subscription to the third RAT based at least in part on the determination that the UE or the second subscription is not capable of supporting calls using the first RAT. ### Claim 6 (depends on 1) The method of claim 1, further comprising: receiving, from the serving cell, a command to fall back from the first RAT to the second RAT for the call request; and determining that the call request is received from the serving cell that is associated with fallback from the first RAT to the second RAT for calls based at least in part on receiving the command. ### Claim 7 (depends on 6) The method of claim 6, further comprising ignoring the command. ### Claim 8 (depends on 1) The method of claim 1, further comprising outputting, via one or more output components of the UE, an indication that the call request was rejected based at least in part on rejecting the call request. ### Claim 9 (depends on 1) The method of claim 1, further comprising determining that the third RAT is available for communications of the UE; and wherein rejecting the call request or transitioning the second subscription to the third RAT comprises transitioning the second subscription to the third RAT based at least in part on the determination that the third RAT is available for communications of the UE. ### Claim 10 (depends on 1) The method of claim 1, further comprising determining that the third RAT is not available for communications of the UE; and wherein rejecting the call request or transitioning the second subscription to the third RAT comprises rejecting the call request based at least in part on the determination that the third RAT is not available for communications of the UE. ### Claim 11 (depends on 1) The method of claim 1, further comprising recording a missing call based at least in part on rejecting the call request. ### Claim 12 (depends on 1) The method of claim 1, wherein the first RAT is a New Radio RAT, the second RAT is a Long Term Evolution RAT, and the third RAT is a wireless local area network RAT or a non-third generation partnership project access RAT. ### Claim 13 A method of wireless communication performed by a user equipment (UE), comprising: determining that the UE is in an active session using a first radio access technology (RAT) associated with a first subscription of the UE; determining that a second subscription of the UE is associated with a call on hold using the first RAT while the UE is in the active session using the first RAT associated with the first subscription of the UE; and blocking transmission of an inter-RAT measurement report associated with the first RAT and a second RAT based at least in part on the determination that the second subscription of the UE is associated with the call on hold using the first RAT while the UE is in the active session using the first RAT associated with the first subscription of the UE. ### Claim 14 (depends on 13) The method of claim 13, further comprising: receiving an inter-RAT measurement control command to transmit the inter-RAT measurement report; and ignoring the inter-RAT measurement control command based at least in part on the determination that the second subscription of the UE is associated with the call on hold using the first RAT while the UE is in the active session using the first RAT associated with the first subscription of the UE. ### Claim 15 (depends on 13) The method of claim 13, further comprising: determining that at least one of the active session or the call on hold is terminated; and unblocking transmission of one or more inter-RAT measurement reports based at least in part on the determination that at least one of the active session or the call on hold is terminated to enable the UE to transmit the one or more inter-RAT measurement reports based at least in part on an inter-RAT measurement control command. ### Claim 16 (depends on 13) The method of claim 13, wherein the first RAT is a New Radio RAT and the second RAT is a Long Term Evolution RAT. ### Claim 17 A user equipment (UE) for wireless communication, comprising: one or more memories; and one or more processors operatively coupled to the one or more memories, the one or more processors configured to: receive, while the UE is in an active session using a first radio access technology (RAT) associated with a first subscription of the UE, a call request via the first RAT, wherein the call request is associated with a second subscription of the UE; search a database that stores information indicating whether one or more cells of the first RAT are associated with fallback from the first RAT to a second RAT for calls; determine, based at least in part on searching the database, that the call request is received from a serving cell that is associated with fallback from the first RAT to the second RAT for calls; and reject the call request or transition the second subscription to a third RAT based at least in part on the determination that the call request is received via the serving cell that is associated with fallback from the first RAT to the second RAT for calls. ### Claim 18 (depends on 17) The UE of claim 17, wherein the UE is further configured to store, in the database, an indication that the serving cell is associated with fallback from the first RAT to the second RAT for calls based at least in part on receiving a command to fall back from the first RAT to the second RAT on the serving cell. ### Claim 19 (depends on 17) The UE of claim 17, wherein the UE is further configured to transmit an indication that the serving cell is associated with fallback from the first RAT to the second RAT for calls based at least in part on receiving a command to fall back from the first RAT to the second RAT on the serving cell. ### Claim 20 (depends on 17) The UE of claim 17, wherein the UE is further configured to: determine that the UE or the second subscription is not capable of supporting calls using the first RAT; and reject the call request or transition the second subscription to the third RAT based at least in part on the determination that the UE or the second subscription is not capable of supporting calls using the first RAT. ### Claim 21 (depends on 17) The UE of claim 17, wherein the UE is further configured to: receive, from the serving cell, a command to fall back from the first RAT to the second RAT for the call request; and determine that the call request is received from the serving cell that is associated with fallback from the first RAT to the second RAT for calls based at least in part on receiving the command. ### Claim 22 (depends on 17) The UE of claim 17, wherein the UE is further configured to output, via one or more output components of the UE, an indication that the call request was rejected based at least in part on rejecting the call request. ### Claim 23 (depends on 17) The UE of claim 17, wherein the UE is further configured to determine that the third RAT is available for communications of the UE; and wherein the UE, when rejecting the call request or transitioning the second subscription to the third RAT, is configured to transition the second subscription to the third RAT based at least in part on the determination that the third RAT is available for communications of the UE. ### Claim 24 (depends on 17) The UE of claim 17, wherein the UE is further configured to determine that the third RAT is not available for communications of the UE; and wherein the UE, when rejecting the call request or transitioning the second subscription to the third RAT, is configured to reject the call request based at least in part on the determination that the third RAT is not available for communications of the UE. ### Claim 25 (depends on 17) The UE of claim 17, wherein the UE is further configured to record a missing call based at least in part on rejecting the call request. ### Claim 26 (depends on 17) The UE of claim 17, wherein the UE is further configured to update the information stored in the database based at least in part on receiving updated information from one or more other devices. ### Claim 27 A user equipment (UE) for wireless communication, comprising: one or more memories; and one or more processors operatively coupled to the one or more memories, the one or more processors configured to: determine that the UE is in an active session using a first radio access technology (RAT) associated with a first subscription of the UE; determine that a second subscription of the UE is associated with a call on hold using the first RAT while the UE is in the active session using the first RAT associated with the first subscription of the UE; and block transmission of an inter-RAT measurement report associated with the first RAT and a second RAT based at least in part on the determination that the second subscription of the UE is associated with the call on hold using the first RAT while the UE is in the active session using the first RAT associated with the first subscription of the UE. ### Claim 28 (depends on 27) The UE of claim 27, wherein the UE is further configured to: receive an inter-RAT measurement control command to transmit the inter-RAT measurement report; and ignore the inter-RAT measurement control command based at least in part on the determination that the second subscription of the UE is associated with the call on hold using the first RAT while the UE is in the active session using the first RAT associated with the first subscription of the UE. ### Claim 29 (depends on 27) The UE of claim 27, wherein the UE is further configured to: determine that at least one of the active session or the call on hold is terminated; and unblock transmission of one or more inter-RAT measurement reports based at least in part on the determination that at least one of the active session or the call on hold is terminated to enable the UE to transmit the one or more inter-RAT measurement reports based at least in part on an inter-RAT measurement control command. ### Claim 30 (depends on 27) The UE of claim 27, wherein the first RAT is a New Radio RAT and the second RAT is a Long Term Evolution RAT.