Patent ID: 8018904
Filing Date: 2011-09-13
Classification: H04B,H04W

Abstract:
1. A method of initiating a telecommunications uplink from a mobile terminal to a telecommunications network, the mobile terminal having a transmission chain including a baseband stage, a power amplification stage and an antenna, the method comprising: transmitting a preamble signal from the mobile terminal at a first time, the preamble signal being transmitted in accordance with at least two variable transmission parameters of the mobile terminal; and determining whether a base station has successfully received the preamble signal; in the event it is not determined that a base station has successfully received the preamble signal, changing at least one of the transmission parameters, and repeating the transmitting of the preamble signal and the determining whether a base station has successfully received the preamble signal at a time later than the first time, wherein each time it is not determined that a base station has successfully received the preamble signal, the changing at least one of the transmission parameters comprises varying a transmission parameter of the preamble signal that is different from a transmission parameter varied in the previous transmission, and wherein the changing at least one of the transmission parameters results in an alteration of a signal diversity of one or more preambles as received by the base station at the later time.