Patent ID: 8175628
Filing Date: 2012-05-08
Classification: H04W

Abstract:
1. A method of reducing latency when setting up a Push-to-Talk (PTT) session from a user terminal in a radio communication network, said method comprising the steps of: obtaining a radio bearer for the user terminal when a user of the terminal indicates that a PTT session will be requested in the near future; maintaining the radio bearer during a time period while waiting for the user to request that the PTT session be set up; sending from the user terminal to the network at least one Heartbeat message having a length exceeding a network threshold for triggering the network to place the user terminal on a Dedicated Channel (DCH), sending a plurality of Heartbeat messages separated by a time period with a duration shorter than a network time period for removing terminals from the DCH for inactivity; detecting that the user has requested that the PTT session be set up; and sending a PTT request message to the network utilizing the radio bearer previously obtained for the user terminal.