Patent ID: 9319952
Filing Date: 2016-04-19
CPC Classification: H04W

Claim Text:
1. A method by a (UE) client device during a hybrid network operation, where hybrid network operation of the UE client device is characterized by intermittent switching between a first long term evolution (LTE) network and a second Code Division Multiple Access 1× (CDMA 1×) network, the method comprising: by the UE client device: identifying one or more tune away events that are likely to adversely impact operation of the UE client device, where during the one or more tune away events the UE client device tunes away from the first LTE network; estimating a duration of the one or more tune away events; determining an adjustment to a Timing Advance (TA) timer maintained at the UE client device based on the estimated duration of the one or more tune away events, wherein the adjustment is determined to support triggering a loss of state synchronization; after completion of the one or more tune away events, adjusting the TA timer according to the determined adjustment; identifying the loss of state synchronization subsequent to the adjusting and based on an expiration of the TA timer; and sending a Random Access Channel (RACH) sequence to the LTE network subsequent to identifying the loss of state synchronization.