Uplink timing maintenance upon time alignment timer expiry
First Claim
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1. A method, performed at a User Equipment (UE) of a wireless communications network, the method comprising:
- detecting that a downlink transmission timing has changed by an amount of time;
determining that a time alignment timer (TAT) is not running; and
while the TAT is not running, adjusting a timing advance for uplink transmissions based on the amount of time that the downlink transmission timing has changed, wherein the timing advance for uplink transmissions was stored in memory at expiration of the TAT.
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Abstract
Systems, apparatuses, and methods for uplink timing maintenance in wireless communications are provided. Certain aspects of the disclosure involve, at a user equipment (UE), detecting a downlink transmission timing has changed by an amount of time. The UE may determine that a time alignment timer (TAT) is not running or determine the downlink transmission timing change is not compensated for. The UE can adjust a timing advance based on the amount of time that the downlink transmission timing has changed.
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Citations
15 Claims
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1. A method, performed at a User Equipment (UE) of a wireless communications network, the method comprising:
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detecting that a downlink transmission timing has changed by an amount of time; determining that a time alignment timer (TAT) is not running; and while the TAT is not running, adjusting a timing advance for uplink transmissions based on the amount of time that the downlink transmission timing has changed, wherein the timing advance for uplink transmissions was stored in memory at expiration of the TAT. - View Dependent Claims (2, 3, 4, 5)
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6. A user equipment of a wireless communications network, the user equipment comprising:
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an antenna; a transceiver; and a processor configured to; detect a downlink transmission timing has changed by an amount of time; determine that a time alignment timer (TAT) is not running; and while the TAT is not running, adjust a timing advance for uplink transmissions based on the amount of time that the downlink transmission timing has changed, wherein the timing advance for uplink transmissions was stored in memory at expiration of the TAT. - View Dependent Claims (7, 8, 9, 10)
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11. A non-transitory computer readable medium storing instructions to cause a processor to perform operations comprising:
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detecting that a downlink transmission timing has changed by an amount of time; determining that a time alignment timer (TAT) is not running; and while the TAT is not running, adjusting a timing advance for uplink transmissions based on the amount of time that the downlink transmission timing has changed, wherein the timing advance for uplink transmissions was stored in memory at expiration of the TAT. - View Dependent Claims (12, 13, 14, 15)
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Specification