Patent ID: 9332512
Filing Date: 2016-05-03
CPC Classification: H04L,H04W

Claim Text:
1. A method comprising: synchronizing at a user equipment at least one of transmissions and receptions over allocated radio resources within a first timing advance group using a first timer; synchronizing at the user equipment at least another one of transmissions and receptions over other allocated radio resources within a second timing advance group using a second timer; and in response to determining that the first timer is not expired while the second timer has expired with a radio network which has allocated the respective radio resources, following a first procedure for a case in which there is a primary component carrier within the second timing advance group and following a different second procedure for a case in which there is no primary component carrier within the second timing advance group, wherein the first procedure comprises flushing all hybrid automatic repeat request buffers and wherein the second procedure comprises flushing all hybrid automatic repeat request buffers for all uplink carriers associated with the expired second timer; wherein the first timer is a timing alignment timer associated with the first timing advance group and the second timer is another timing alignment timer associated with the second timing advance group.