Method for wireless data transmission, communication system, wireless terminal apparatus and wireless base station apparatus

A method for radio data transmission in a radio communication system including a radio terminal apparatus and a radio base station apparatus, the method comprising:

• transmitting, by the radio base station apparatus, data to an asynchronous radio terminal apparatus not synchronized with the radio base station apparatus on an uplink, and transmitting timing adjustment information for synchronization simultaneously with or after the transmission of the data;
• and
• establishing a synchronous channel with the radio base station apparatus based on the timing adjustment information and transmitting a reply signal indicating whether or not the data has been correctly received, to the radio base station apparatus via the synchronous channel, by the asynchronous radio terminal apparatus.

A communication system comprising a radio base station apparatus and a radio terminal apparatus,

• wherein the radio base station apparatus comprises a transmission unit which transmits data and a signal indicating radio resource to be used for random access to an asynchronous radio terminal apparatus not synchronized with the radio base station apparatus on an uplink, the data and the signal being transmitted by the radio base station apparatus;
• and
• the radio terminal apparatus comprises a transmission unit which transmits, to the radio base station apparatus via a random access channel, a reply signal generated based on whether or not the data has been correctly received and on the signal indicating the radio resource which has been received from the radio base station apparatus.

A radio terminal apparatus comprising:

• a reception unit which receives data and a signal indicating radio resource to be used for random access, the data and the signal being transmitted from a radio base station apparatus to a radio terminal apparatus not synchronized with the radio base station apparatus on an uplink;
• and
• a transmission unit which transmits, to the radio base station apparatus via a random access channel, a reply signal generated based on whether or not the data has been correctly received and on the signal indicating the radio resource which has been received from the radio base station apparatus.

A radio base station apparatus comprising:

• a transmission unit which transmits data and a signal indicating radio resource to be used for random access to an asynchronous radio terminal apparatus which is a radio terminal apparatus not synchronized with the radio base station apparatus on an uplink;
• and
• a reception unit which receives, via a random access channel, a reply signal generated based on whether or not the data has been correctly received and on the signal indicating the radio resource.

A radio base station apparatus comprising:

• a transmission unit which transmits data to an asynchronous radio terminal apparatus which is a radio terminal apparatus not synchronized with the radio base station apparatus on an uplink and which transmits timing adjustment information for synchronization simultaneously with or after the transmission of the data;
• and
• a reception unit which receives a reply signal indicating whether or not the data has been correctly received, from the radio terminal apparatus via the synchronous channel.