Power ramping for rach

A secondary station comprising:

• a processor configured to:
• transmit via a transmitte and antennar, a first access preamble to a primary station to request access to a resource,
• the processor being further reconfigured to:
• upon an indication of failure of reception of the first access preamble, at the primary station, start a first power ramping scheme for transmitting via the transmitter and antenna, one or more times the first access preamble successively with a transmission power increased by a predetermined first power level step, and,
• upon an indication of one or more failures of reception of the first access preamble with the first power ramping scheme, terminating the first power ramping scheme and starting a second power ramping scheme for successively transmitting via the transmitter and antenna, one or more times a second access preamble that is different than the first access preamble, wherein the second power ramping scheme comprises transmission in at least one access slot different to that used for transmission of the first access preamble.

A secondary station for use in a network of one or more primary and multiple secondary stations, the secondary station comprising:

• one or more antennas,
• a coupler connected to the one or more antennas to, at alternate times, rout transmissions to the antennas and rout receptions from the antennas,
• a transmitter with an input and an output, the output being connected to the coupler to transmit the transmissions,
• a receiver with an output and an input, the input being connected to the coupler to receive the receptions, and
• a processor connected to the input of the transmitter and the output of the receiver to control the transmitter and the receiver for communicating with the primary station, and
• wherein the processor of the secondary station transmits via the transmitter and antenna, a first access preamble to a primary station, and upon indication of one or more failures of reception of the first access preamble, the secondary station starting a first power ramping scheme for successively transmitting via the transmitter and antenna, the first access preamble at power levels increasing by a first power level step, and upon an indication of one or more failures of reception of the first access preamble with the first power ramping scheme, terminating the first power ramping scheme and starting a second power ramping scheme, being different from the first power ramping scheme, wherein the second power ramping scheme comprises transmission via the transmitter and antenna, of a second access preamble in at least one access slot different to that used for transmission of the first access preamble.

A tangible computer-readable storage-medium that is not a transitory propagating signal or wave, the medium modified by control information including instructions for performing a method in a secondary station for communicating in a network with a primary station and requesting a resource from the primary station, the method comprising:

• in a secondary station:
• a processor of the secondary station transmitting via a transmitter and antenna, 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 processor of the secondary station starting a first power ramping scheme for transmitting the first access preamble, whereby the first power ramping scheme successively transmits via the transmitter and antenna, 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, wherein the second power ramping scheme comprises transmission via the transmitter and antenna, in at least one access slot different to that used for transmission of the first access preamble.

A primary station comprising:

• a processor configured to:
• receive via an antenna and a receiver from a secondary station, a first access preamble to request a resource;
• transmit via a transmitter and the antenna to the secondary station, an acknowlegement of receipt depending on a correct preamble to request a resource being received;
• transmit via the transmitter and antenna to the secondary station, a negitive acknowlegement of the receipt depending on an incorrect preamble to request a resource being received;
• transmit via the transmitter and antenna to the secondary station, an indication to reconfigure ramping schemes from a first ramping scheme to a second ramping scheme, depending on an incorrect preamble to request a resource being received, the indication to reconfigure ramping schemes is different from the negitive acknowlegement;
• transmit via the transmitter and antennar, to the secondary station, an indication of a grant of the resource depending on the receipt of the correct preamble to request a resource.