# US 2022/0046491 A1 · Execution of reduced signaling handover > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0046491 A1 - Document ID: US20220046491A1 - Status: Published application - Kind: A1 - Application number: 17/444,143 - Filed: 2021-07-30 - Published: 2022-02-10 - Earliest claimed: 2020-08-05 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Bharat SHRESTHA; Prasad Reddy KADIRI; Umesh PHUYAL; Ayan SENGUPTA - Web page: https://patentgrep.com/patent/US20220046491A1 ## CPC - H04W 36/0072: {of resource information of target access point} - H04W 36/0009: {for a plurality of users or terminals, e.g. group communication or moving wireless networks (user group management H04W4/08; processing of subscriber group data H04W8/186)} - H04W 68/02: Arrangements for increasing efficiency of notification or paging channel - H04W 84/06: Airborne or Satellite Networks (space-based or airborne stations H04B7/185) - 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 determine that a reduced signaling handover condition has occurred. The UE may execute a reduced signaling handover from a source base station to a target base station based at least in part on determining that the reduced signaling handover condition has occurred. Numerous other aspects are described. ## Claims ### Claim 1 A user equipment (UE) for wireless communication, comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to: determine that a reduced signaling handover condition has occurred; and execute a reduced signaling handover from a source base station to a target base station based at least in part on determining that the reduced signaling handover condition has occurred. ### Claim 2 (depends on 1) The UE of claim 1, wherein the one or more processors, to determine that the reduced signaling handover condition has occurred, are configured to: receive at least one of: a reduced signaling handover indication, wherein the reduced signaling handover indication is at least one of a group handover indication transmitted to the UE and one or more other UEs or a UE specific handover indication transmitted to the UE, or a short paging message for at least one of a change in system information, reduced signaling handover, or context relocation. ### Claim 3 (depends on 1) The UE of claim 1, wherein the one or more processors, to determine that the reduced signaling handover condition has occurred, are configured to: determine that the reduced signaling handover condition has occurred based at least in part on at least one of a position of a satellite used to transmit communications between the UE and the source base station or a timer associated with the satellite. ### Claim 4 (depends on 1) The UE of claim 1, wherein the one or more processors, to execute the reduced signaling handover from the source base station to the target base station, are configured to execute a handover from the source base station to the target base station without transmitting a radio resource control reconfiguration complete message to indicate that the handover is complete, and wherein the one or more processors are further configured to: transmit a random access preamble to the target base station; and receive, from the target base station, a random access response that provides a handover complete acknowledgement. ### Claim 5 (depends on 1) The UE of claim 1, wherein the reduced signaling handover condition is based at least in part on a satellite switching from a feeder link associated with the source base station to a feeder link associated with the target base station, and wherein the reduced signaling handover changes a security key for the UE, updates a round trip delay associated with the satellite, and continues using a current cell radio resource control configuration of the UE. ### Claim 6 (depends on 1) The UE of claim 1, wherein the one or more processors, to execute the reduced signaling handover from the source base station to the target base station, are configured to: enter a radio resource control inactive state based at least in part on determining that the reduced signaling handover condition has occurred; and resume, after entering the radio resource control inactive state, a radio resource control connected state in connection with the target base station. ### Claim 7 (depends on 1) The UE of claim 1, wherein the one or more processors, to execute the reduced signaling handover from the source base station to the target base station, are configured to: perform a radio resource control re-establishment procedure to establish a connection with the target base station based at least in part on determining that the reduced signaling handover condition has occurred. ### Claim 8 (depends on 1) The UE of claim 1, wherein the one or more processors, to execute the reduced signaling handover from the source base station to the target base station, are configured to: execute the reduced signaling handover from the source base station to the target base station based at least in part on a handover configuration for the target base station included in a pre-configured handover command. ### Claim 9 (depends on 1) The UE of claim 1, wherein the one or more processors, to execute the reduced signaling handover from the source base station to the target base station, are configured to: determine a timing advance associated with the target base station. ### Claim 10 (depends on 1) The UE of claim 1, wherein the one or more processors are further configured to: transmit, to the target base station, a contention free random access preamble as an indication that the reduced signaling handover is complete. ### Claim 11 (depends on 1) The UE of claim 1, wherein the one or more processors are further configured to: monitor for downlink communications from the target base station based at least in part on the reduced signaling handover; and receive a downlink communication from the target base station without sending a message to the target base station to indicate that the reduced signaling handover is complete. ### Claim 12 (depends on 11) The UE of claim 11, wherein the one or more processors are further configured to transmit a random access preamble to the target base station, and wherein the one or more processors, to receive the downlink communication from the target base station, are configured to: receive, from the target base station, a random access response indicating that the reduced signaling handover is complete. ### Claim 13 (depends on 11) The UE of claim 11, wherein the one or more processors, to monitor for downlink communications from the target base station, are configured to: monitor for downlink communications from the target base station upon expiration of a timer associated with the reduced signaling handover. ### Claim 14 (depends on 11) The UE of claim 11, wherein the one or more processors are further configured to: receive an uplink grant from the target base station for a radio resource control reconfiguration complete message to indicate that the reduced signaling handover is complete; and transmit, to the target base station, the radio resource control reconfiguration complete message to indicate that the reduced signaling handover is complete using the uplink grant. ### Claim 15 (depends on 11) The UE of claim 11, wherein the one or more processors are further configured to: determine that no uplink grant has been received from the target base station within a time limit from completion of the reduced signaling handover or that synchronization with the target base station has been lost in terms of at least one of a time or frequency compensation requirement; and transmit, to the target base station and based at least in part on determining that no uplink grant has been received or that synchronization with the target base station has been lost, a request signal for an uplink grant for a radio resource control reconfiguration complete message to indicate that the reduced signaling handover is complete, using at least one of a physical uplink control channel resource or a random access process. ### Claim 16 (depends on 11) The UE of claim 11, wherein the one or more processors are further configured to: derive a contention free physical random access channel resource based at least in part on an indication received from the source base station; and transmit, to the target base station, a message to indicate that the reduced signaling handover is complete, using the contention free physical random access channel resource. ### Claim 17 A method of wireless communication performed by a user equipment (UE), comprising: determining that a reduced signaling handover condition has occurred; and executing a reduced signaling handover from a source base station to a target base station based at least in part on determining that the reduced signaling handover condition has occurred. ### Claim 18 (depends on 17) The method of claim 17, wherein determining that the reduced signaling handover condition has occurred comprises: receiving at least one of: a reduced signaling handover indication, wherein the reduced signaling handover indication is at least one of a group handover indication transmitted to the UE and one or more other UEs or a UE specific handover indication transmitted to the UE, or a short paging message for at least one of a change in system information, reduced signaling handover, or context relocation. ### Claim 19 (depends on 17) The method of claim 17, wherein determining that the reduced signaling handover condition has occurred comprises: determining that the reduced signaling handover condition has occurred based at least in part on at least one of a position of a satellite used to transmit communications between the UE and the source base station or a timer associated with the satellite. ### Claim 20 (depends on 17) The method of claim 17, wherein executing the reduced signaling handover from the source base station to the target base station comprises executing a handover from the source base station to the target base station without transmitting a radio resource control reconfiguration complete message to indicate that the handover is complete, and wherein the method further comprises: transmitting a random access preamble to the target base station; and receiving, from the target base station, a random access response that provides a handover complete acknowledgement. ### Claim 21 (depends on 17) The method of claim 17, wherein the reduced signaling handover condition is based at least in part on a satellite switching from a feeder link associated with the source base station to a feeder link associated with the target base station, and wherein the reduced signaling handover changes a security key for the UE, updates a round trip delay associated with the satellite, and continues using a current cell radio resource control configuration of the UE. ### Claim 22 (depends on 17) The method of claim 17, wherein executing the reduced signaling handover from the source base station to the target base station comprises: entering a radio resource control inactive state based at least in part on determining that the reduced signaling handover condition has occurred; and resuming, after entering the radio resource control inactive state, a radio resource control connected state in connection with the target base station. ### Claim 23 (depends on 17) The method of claim 17, wherein executing the reduced signaling handover from the source base station to the target base station comprises: performing a radio resource control re-establishment procedure to establish a connection with the target base station based at least in part on determining that the reduced signaling handover condition has occurred. ### Claim 24 (depends on 17) The method of claim 17, further comprising: transmitting, to the target base station, a contention free random access preamble as an indication that the reduced signaling handover is complete. ### Claim 25 (depends on 17) The method of claim 17, further comprising: monitoring for downlink communications from the target base station based at least in part on the reduced signaling handover; and receiving a downlink communication from the target base station without sending a message to the target base station to indicate that the reduced signaling handover is complete. ### Claim 26 (depends on 25) The method of claim 25, further comprising transmitting a random access preamble to the target base station, wherein receiving the downlink communication from the target base station comprises: receiving, from the target base station, a random access response indicating that the reduced signaling handover is complete. ### Claim 27 (depends on 25) The method of claim 25, further comprising: receiving an uplink grant from the target base station for a radio resource control reconfiguration complete message to indicate that the reduced signaling handover is complete; and transmitting, to the target base station, the radio resource control reconfiguration complete message to indicate that the reduced signaling handover is complete using the uplink grant. ### Claim 28 (depends on 25) The method of claim 25, further comprising: determining that no uplink grant has been received from the target base station within a time limit from completion of the reduced signaling handover or that synchronization with the target base station has been lost in terms of at least one of a time or frequency compensation requirement; and transmitting, to the target base station and based at least in part on determining that no uplink grant has been received or that synchronization with the target base station has been lost, a request signal for an uplink grant for a radio resource control reconfiguration complete message to indicate that the reduced signaling handover is complete, using at least one of a physical uplink control channel resource or a random access process. ### Claim 29 A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to: determine that a reduced signaling handover condition has occurred; and execute a reduced signaling handover from a source base station to a target base station based at least in part on determining that the reduced signaling handover condition has occurred. ### Claim 30 An apparatus for wireless communication, comprising: means for determining that a reduced signaling handover condition has occurred; and means for executing a reduced signaling handover from a source base station to a target base station based at least in part on determining that the reduced signaling handover condition has occurred.