Mobile communication method, radio base station apparatus and mobile station

A radio base station apparatus used in a mobile communication method in which a random access procedure is performed between the radio base station apparatus and a mobile station before communication is started or resumed therebetween, the radio base station apparatus comprising:

• an uplink resource assignor unit configured to assign an uplink resource to the mobile station in response to a random access preamble transmitted by the mobile station;
• a random access response signal transmitter unit configured to notify, to the mobile station, the uplink resource which is assigned by the uplink resource assignor unit, by using a random access response signal;
• and
• an uplink scramble decoder unit configured to perform descrambling processing on an uplink signal transmitted from the mobile station by use of the uplink resource, by using an uplink scrambling sequence corresponding to the uplink resource.

A mobile station used in a mobile communication method in which a random access procedure is performed between a radio base station apparatus and the mobile station before communication is started or resumed therebetween, the mobile station comprising:

• a random access preamble transmitter unit configured to transmit, to the radio base station apparatus, a random access preamble selected among from a plurality of random access preambles;
• a random access response signal receiver unit configured to receive, from the radio base station apparatus, a random access response signal which is used for notification of an uplink resource;
• and
• an uplink signal transmitter unit configured to perform scrambling processing that uses an uplink scrambling sequence corresponding to the uplink resource notified by use of the random access response signal, and to transmit an uplink signal by using the uplink resource.

A mobile communication method in which a random access procedure is performed between a radio base station apparatus and a mobile station before communication is started or resumed therebetween, the method comprising the steps of:

• transmitting, from the mobile station to the radio base station apparatus, a random access preamble selected among from a plurality of random access preambles;
• assigning, at the radio base station apparatus, an uplink resource to the mobile station in response to the received random access preamble;
• notifying, from the radio base station apparatus to the mobile station, the assigned uplink resource by using a random access response signal;
• transmitting, at the mobile station, an uplink signal by using the uplink resource, after performing scrambling processing that uses an uplink scrambling sequence corresponding to the random access response signal used for the notification of the uplink resource;
• and
• performing, at the radio base station apparatus, descrambling processing on the uplink signal transmitted by use of the uplink resource, by using an uplink scrambling sequence corresponding to the random access response signal used for the notification of the uplink resource.

A radio base station apparatus used in a mobile communication method in which a random access procedure is performed between the radio base station apparatus and a mobile station before communication is started or resumed therebetween, the radio base station apparatus comprising:

• an uplink resource assignor unit configured to assign an uplink resource to the mobile station in response to a random access preamble transmitted by the mobile station;
• an random access response signal transmitter unit configured to notify, to the mobile station, the uplink resource which is assigned by the uplink resource assignor unit, by using a random access response signal;
• and
• an uplink scramble decoder unit configured to perform descrambling processing on an uplink signal transmitted from the mobile station by use of the uplink resource, by using an uplink scrambling sequence corresponding to the random access response signal used for the notification of the uplink resource.

A mobile station used in a mobile communication method in which a random access procedure is performed between a radio base station apparatus and the mobile station before communication is started or resumed therebetween, the mobile station comprising:

• a random access preamble transmitter unit configured to transmit, to the radio base station apparatus, a random access preamble selected among from a plurality of random access preambles;
• a random access response signal receiver unit configured to receive a random access response signal which is used for notification of an uplink resource, from the radio base station apparatus;
• and
• an uplink signal transmitter unit configured to perform scrambling processing that uses an uplink scrambling sequence corresponding to the random access response signal used for the notification of the uplink resource, and, to transmit an uplink signal by using the uplink resource.