1. A method operable by a mobile entity (ME) in a wireless network, comprising: receiving from the network a global time value having a wraparound time longer than that of a system frame number for the network, the global time value being based at least in part on an overhead message conveying at least one parameter of a first radio access technology (RAT) different from a second RAT used by the network; determining a current global time based on the received global time value; and sending an uplink message, the message including the current global time as a global timestamp.