Patent ID: 9084212
Filing Date: 2015-07-14
Classification: H04B,H04L,H04W

Abstract:
1. A method of operating a secondary station for requesting access to a resource from a primary station, said method comprising: a secondary station transmitting to a primary station an access preamble to request access to a resource, upon an indication of failure of reception by the primary station of the access preamble, the secondary station starting a first power ramping scheme for transmitting the first access preamble, whereby the first power ramping scheme successively transmits one or more times the first access preamble with successive transmissions increased in power by a predetermined first power level step, upon an indication of one or more failures of reception of the first access preamble with the first power ramping scheme at the primary station, the secondary station terminating the first power ramping scheme and starting a second power ramping scheme for transmitting a second access preamble to request access to the resource from the primary station, the second preamble being different from the first access preamble, whereby the second power ramping scheme successively transmits a second access preamble with a transmission power successively increased by a predetermined second power level step being different from the first power level step of the first power ramping scheme.