Radio communication system and mobile station device

• US 8,009,663 B2
• Filed: 08/31/2009
• Issued: 08/30/2011
• Est. Priority Date: 08/08/2007
• Status: Active Grant

• Current Assignee: Ueran Technology LLC
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yamada, Shohei, Kato, Yasuyuki
• Primary Examiner(s): Pham; Chi H
• Assistant Examiner(s): Elallam; Ahmed
• Application Number:
  US12/551,290
• Publication Number:
  US 20090316678A1
• Time in Patent Office: 729 Days
• Field of Search: 370/241, 370/328, 370/329, 370/336, 370/345, 370/349, 370/350, 455/450
• US Class Current: 370/350
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 56/005 compensating for timing error by adjustment in the receiver
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A mobile station device transmits a random access preamble to a base station device and performs uplink timing alignment based on the synchronization timing deviation information included in a random access response which the base station device transmits in response to the transmitted random access preamble, wherein in an uplink synchronous status, the mobile station device does not perform uplink timing alignment based on synchronization timing deviation information included in a random access response, which is a response to a random access preamble whose preamble ID is randomly selected by the mobile station device.

Claims

1. A radio communication system comprising:

a mobile station device; and

a base station device, wherein

the mobile station device transmits a random access preamble to the base station device and receives a random access response transmitted from the base station device in response to the transmitted random access preamble,

the base station device receives the random access preamble from the mobile station device and transmits the random access response to the mobile station device in response to the received random access preamble, and

when transmission timing of a message for the random access response overlaps with transmission timing of an ACK/NACK for downlink data transmitted by the base station device at an arbitrary timing, the mobile station device does not perform to transmit the ACK/NACK.

2. A mobile station device comprising:

a transmission unit which transmits a random access preamble to a base station device;

a reception unit which receives a random access response transmitted from the base station device in response to the transmitted random access preamble; and

a control unit which controls the transmission of an ACK/NACK for downlink data transmitted by the base station device at an arbitrary timing,

wherein when transmission timing of a message for the random access response overlaps with transmission timing of the ACK/NACK, the control unit prevents transmission of the ACK/NACK.

3. A processing method of a mobile station device, the processing method comprising:

transmitting a random access preamble to a base station device;

receiving a random access response transmitted from the base station device in response to the transmitted random access preamble; and

controlling transmission of an ACK/NACK for downlink data transmitted by the base station device at an arbitrary timing,

wherein when transmission timing of a message for the random access response overlaps with transmission timing of the ACK/NACK, the step of controlling transmission prevents transmission of the ACK/NACK.