Mobile station device, base station device, communication system, communication method, and program

摘要

Provided is a mobile station device which can increase the success ratio and reduce a communication delay when transmitting a dedicated preamble from the mobile station device to a base station device by using a random access channel (RACH). The mobile station device performs random access to the base station device by using a dedicated preamble. The mobile station device transmits a first message by using the dedicated preamble and again transmits the first message using the dedicated preamble during a period (a random access response reception-uncertain period) when the base station device may transmit a second message as a response to the first message.

主权项

1. A mobile station apparatus in a communication system performing non-contention based random access to a base station apparatus, the mobile station apparatus comprising:
a receiver configured to receive, from the base station apparatus, a dedicated preamble ID which is used for first transmission and retransmission, and which is uniquely assigned by the base station apparatus to avoid a preamble contention among a plurality of mobile station apparatuses, and random access resource information which is used for first transmission and retransmission; and a transmitter configured to:
transmit, to the base station apparatus via a resource specified by the random access resource information, a preamble generated by using the dedicated preamble ID, andretransmit the preamble to the base station apparatus via the resource in a case that a response to the preamble fails to be received after the preamble is transmitted within a predetermined period which is determined based on the random access resource information.