Uplink Timing Maintenance Upon Time Alignment Timer Expiry
First Claim
Patent Images
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
maintaining a timing advance based on the amount of time that the downlink transmission timing has changed.
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Accused Products
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.
35 Citations
14 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 maintaining a timing advance based on the amount of time that the downlink transmission timing has changed. - View Dependent Claims (3, 4, 5, 6, 7)
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2. (canceled)
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8. 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 maintain a timing advance based on the amount of time that the downlink transmission timing has changed. - View Dependent Claims (10, 11, 12, 13, 14)
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9. (canceled)
Specification