Uplink timing maintenance upon time alignment timer expiry

摘要

Systems, apparatuses, and methods for uplink timing maintenance in wireless communications are provided. Certain aspects of the disclosure involve applying a timing advance command to adjust uplink transmission timing/resume uplink synchronization; and determining a metric. The metric can be used in determining whether to apply a timing advance command (TAC) to resume uplink resynchronization.

主权项

1. A method executed by a User Equipment for controlling uplink transmission timing of a wireless communications network, the network comprising a base station and the UE, the method comprising:
applying a first timing advance command to adjust uplink transmission timing; determining an expiration of a time alignment timer (TAT) associated with the first timing advance command; determining a time limit equal to an amount of time for an estimated uplink transmission error to exceed a predetermined timing error limit, wherein the estimated uplink transmission error is a timing difference between the uplink transmission timing and an estimated reference timing; receiving a second timing advance command after the expiration of the TAT; and determining whether to use the second timing advance command to resume uplink synchronization based on the determined time limit.