# US 2015/0146684 A1 · Uplink transmission power and timing adjustment in td-scdma baton handover > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0146684 A1 - Document ID: US20150146684A1 - Status: Published application - Kind: A1 - Application number: 14/090,551 - Filed: 2013-11-26 - Published: 2015-05-28 - Earliest claimed: 2013-11-26 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Ming YANG; Tom CHIN; Guangming SHI - Web page: https://patentgrep.com/patent/US20150146684A1 ## CPC - H04W 52/40: during macro-diversity or soft handoff - H04W 36/0072: {of resource information of target access point} - H04W 52/146: {Uplink power control} - H04W 56/0005: {synchronizing of arrival of multiple uplinks} - H04W 56/0045: {compensating for timing error by altering transmission time} - H04W 52/08: Closed loop power control - H04W 52/10: Open loop power control - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A user equipment (UE) may adjust its uplink transmission power and timing for communications with a target cell while awaiting completion of a baton handover procedure. The amount of adjustments for the uplink transmission power/timing may be based on an amount of time remaining before baton handover failure is declared. The steps size of the adjustments may increase as the time remaining before handover failure becomes smaller. ## Claims ### Claim 1 A method of wireless communication, comprising: tuning uplink communications to a target cell as part of a baton handover; and adjusting uplink transmission power or timing by a user equipment, prior to receipt of a transmit power control command, while waiting for the baton handover to complete. ### Claim 2 (depends on 1) The method of claim 1, in which adjusting the uplink transmission power comprises increasing the uplink transmission power based at least in part on how much time remains before handover failure will be declared. ### Claim 3 (depends on 2) The method of claim 2, in which an amount of adjustment increases as a function of an amount of time remaining before handover failure will be declared. ### Claim 4 (depends on 1) The method of claim 1, in which adjusting the timing comprises either advancing uplink transmission timing or delaying the uplink transmission timing based on a current uplink transmission timing. ### Claim 5 (depends on 4) The method of claim 4, in which an amount of adjustment increases as a function of an amount of time remaining before handover failure will be declared. ### Claim 6 (depends on 4) The method of claim 4, in which the current uplink transmission timing is an initial uplink transmission timing plus an adjustment and the initial uplink transmission timing is an uplink transmission timing with a source cell plus a measured downlink time difference between the source cell and the target cell. ### Claim 7 (depends on 1) The method of claim 1, in which a size of adjustment of the uplink transmission power or timing is a function of path loss. ### Claim 8 (depends on 1) The method of claim 1, further comprising validating the adjusting during a time period, the time period being a function of an amount time it takes for a network to detect uplink transmission and start downlink transmission and for a UE to detect a downlink transmission. ### Claim 9 An apparatus for wireless communication, comprising: means for tuning uplink communications to a target cell as part of a baton handover; and means for adjusting uplink transmission power or timing by a user equipment, prior to receipt of a transmit power control command, while waiting for the baton handover to complete. ### Claim 10 (depends on 9) The apparatus of claim 9, in which the means for adjusting the uplink transmission power comprises means for increasing the uplink transmission power based at least in part on how much time remains before handover failure will be declared. ### Claim 11 A computer program product for wireless communication in a wireless network, comprising: a non-transitory computer-readable medium having program code recorded thereon, the program code comprising: program code to tune uplink communications to a target cell as part of a baton handover; and program code to adjust uplink transmission power or timing by a user equipment, prior to receipt of a transmit power control command, while waiting for the baton handover to complete. ### Claim 12 (depends on 11) The computer program product of claim 11, in which the program code to adjust the uplink transmission power comprises program code to increase the uplink transmission power based at least in part on how much time remains before handover failure will be declared. ### Claim 13 An apparatus for wireless communication, comprising: a memory; and at least one processor coupled to the memory and configured: to tune uplink communications to a target cell as part of a baton handover; and to adjust uplink transmission power or timing by a user equipment, prior to receipt of a transmit power control command, while waiting for the baton handover to complete. ### Claim 14 (depends on 13) The apparatus of claim 13, in which the at least one processor is configured to adjust the power by increasing the uplink transmission power based at least in part on how much time remains before handover failure will be declared. ### Claim 15 (depends on 14) The apparatus of claim 14, in which an amount of adjustment increases as a function of an amount of time remaining before handover failure will be declared. ### Claim 16 (depends on 13) The apparatus of claim 13, in which the at least one processor is configured to adjust the timing by either advancing uplink transmission timing or delaying the uplink transmission timing based on a current uplink transmission timing. ### Claim 17 (depends on 16) The apparatus of claim 16, in which an amount of adjustment increases as a function of an amount of time remaining before handover failure will be declared. ### Claim 18 (depends on 16) The apparatus of claim 16, in which the current uplink transmission timing is an initial uplink transmission timing plus an adjustment and the initial uplink transmission timing is an uplink transmission timing with a source cell plus a measured downlink time difference between the source cell and the target cell. ### Claim 19 (depends on 13) The apparatus of claim 13, in which a size of adjustment of the uplink transmission power or timing is a function of path loss. ### Claim 20 (depends on 13) The apparatus of claim 13, in which the at least one processor is further configured to validate the adjusting during a time period, the time period being a function of an amount time it takes for a network to detect uplink transmission and start downlink transmission and for a UE to detect a downlink transmission.