Apparatus, system, and method for access procedure enhancements

1. A mobile communication device for access procedure enhancement, comprising:

a wireless module performing wireless transmissions and receptions to and from a service network; and

a controller module using a transmission power within a probe sequence to transmit an access probe, which comprises information concerning a length of message data but does not comprise the message data, to the service network via the wireless module, increasing the transmission power for retransmitting the access probe within the probe sequence in response to not receiving a pre-acknowledgement of the access probe from the service network via the wireless module in a waiting period of time, repeating the increasing of the transmission power for each retransmission of the access probe within the probe sequence until the pre-acknowledgement of the access probe is received, using the last increased transmission power in a predetermined number of repeats within the probe sequence to transmit another access probe comprising the message data to the service network via the wireless module in response to receiving the pre-acknowledgement of the access probe, increasing the last increased transmission power for the retransmissions of the another access probe after the predetermined number of repeats within the probe sequence, and using the last increased transmission power within the probe sequence for the retransmissions of the another access probe within a next probe sequence,

wherein the waiting period of time is determined according to a coherence-time related offset.

2. The mobile communication device of claim 1 , wherein the access probe is first transmitted using a transmission power which is determined according to reverse-link load information of the service network.

3. The mobile communication device of claim 1 , wherein the access probe is first transmitted using a transmission power and retransmitted according to one of the following:

using the same transmission power in a predetermined number of repeats within the probe sequence, and the controller module further increases the transmission power for the retransmissions of the access probe after the predetermined number of repeats within the probe sequence; and

using the same transmission power within the probe sequence, and the controller module further increases the transmission power for the retransmissions of the access probe within a next probe sequence.

4. The mobile communication device of claim 1 , wherein the service network broadcasts reverse-link load information, and the controller module further determines a cell in the service network to which the access probe is transmitted according to the reverse-link load information.

5. A method for access procedure enhancement by a mobile communication device comprising a wireless module capable of wireless transmissions and receptions, comprising:

using a transmission power within a probe sequence to transmit an access probe, which comprises information concerning a length of message data but does not comprise the message data, to a service network via the wireless module;

increasing the transmission power for retransmitting the access probe within the probe sequence in response to not receiving a pre-acknowledgement of the access probe from the service network via the wireless module in a waiting period of time,

wherein the waiting period of time is determined according to a coherence-time related offset;

repeating the increasing of the transmission power for each retransmission of the access probe within the probe sequence until the pre-acknowledgement of the access probe is received;

using the last increased transmission power in a predetermined number of repeats within the probe sequence to transmit another access probe comprising the message data to the service network via the wireless module in response to receiving the pre-acknowledgement of the access probe;

increasing the last increased transmission power for the retransmissions of the another access probe after the predetermined number of repeats within the probe sequence; and

using the last increased transmission power within the probe sequence for the retransmissions of the another access probe within a next probe sequence.

6. The method of claim 5 , wherein the access probe is first transmitted using a transmission power which is determined according to reverse-link load information of the service network.

7. The method of claim 5 , wherein the access probe is first transmitted using a transmission power and retransmitted according to one of the following:

using the same transmission power in a predetermined number of repeats within the probe sequence, and increasing the transmission power for the retransmissions of the access probe after the predetermined number of repeats within the probe sequence; and

using the same transmission power within the probe sequence, and increasing the transmission power for the retransmissions of the access probe within a next probe sequence.

8. The method of claim 5 , wherein the service network broadcasts reverse-link load information, and the method further comprises determining a cell in the service network to which the access probe is transmitted according to the reverse-link load information.

9. A mobile communication system for access procedure enhancement, comprising:

a mobile communication device using a transmission power within a probe sequence to transmit an access probe which comprises information concerning a length of message data but does not comprise the message data, increasing the transmission power for retransmitting the access probe within the probe sequence in response to not receiving a pre-acknowledgement of the access probe in a waiting period of time, repeating the increasing of the transmission power for each retransmission of the access probe within the probe sequence until the pre-acknowledgement of the access probe is received, using the last increased transmission power in a predetermined number of repeats within the probe sequence to transmit another access probe comprising the message data to the service network in response to receiving the pre-acknowledgement of the access probe, increasing the last increased transmission power for the retransmissions of the another access probe after the predetermined number of repeats within the probe sequence, and using the last increased transmission power within the probe sequence for the retransmissions of the another access probe within a next probe sequence, wherein the waiting period of time is determined according to a coherence-time related offset; and

a service network transmitting the pre-acknowledgement of the access probe to the mobile communication device in response to receiving the access probe or the retransmitted access probe.

10. The mobile communication system of claim 9 , wherein the access probe is first transmitted using a transmission power which is determined according to reverse-link load information of the service network.

11. The mobile communication system of claim 9 , wherein the access probe is first transmitted using a transmission power and retransmitted according to one of the following:

using the same transmission power in a predetermined number of repeats within the probe sequence, and the mobile communication device further increases the transmission power for the retransmissions of the access probe after the predetermined number of repeats within the probe sequence; and

using the same transmission power within a probe sequence, and the mobile communication device further increases the transmission power for the retransmissions of the access probe within a next probe sequence.

12. The mobile communication system of claim 9 , wherein the service network broadcasts reverse-link load information, and the mobile communication device further determines a cell in the service network to which the access probe is transmitted according to the reverse-link load information.