RADIO COMMMUNICATION SYSTEM AND MOBILE STATION DEVICE

• US 20090316630A1
• Filed: 08/31/2009
• Published: 12/24/2009
• Est. Priority Date: 08/08/2007
• Status: Active Grant

• Current Assignee: Ueran Technology LLC
• Original Assignee: Shohei Yamada, Yasuyuki Kato
• Inventors: Yamada, Shohei, Kato, Yasuyuki
• Granted Patent: US 8,089,921 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• 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 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• 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 including a mobile station device which transmits a random access preamble to a base station device and resets a timer managing an uplink synchronous status based on timing deviation information included in a random access response which the base station device transmits in response to the transmitted random access preamble, and the base station device which receives the random access preamble from the mobile station device and transmits a random access response including timing deviation information calculated based on a reception timing of the random access preamble,

wherein, in the uplink synchronous status, upon reception of a random access response including timing deviation information transmitted from the base station device in response to a random access preamble whose preamble ID is randomly selected by the mobile station device, the mobile station device does not perform to reset the timer based on reception of the timing deviation information.

2. The radio communication system according to claim 1,

wherein the uplink synchronous status is sustained until the timer expires.

3. A mobile station device which transmits a random access preamble to a base station device and resets a timer managing an uplink synchronous status based on reception of timing deviation information included in a random access response that the base station device transmits in response to the transmitted random access preamble,

wherein, in the uplink synchronous status, upon reception of a random access response including timing deviation information whose preamble ID is randomly selected by the mobile station device, the mobile station device does not perform to reset the timer based on reception of the timing deviation information.

4. The mobile station device according to claim 3,

wherein the uplink synchronous status is sustained until the timer expires.

5. A radio communication system including a mobile station device which manages a predetermined time as an uplink synchronous status by a timer after receiving a timing deviation information from the base station device, resets the timer based on receiving timing deviation information, and the base station device which transmits the timing deviation information to the mobile station device,

wherein, in the uplink synchronous status, the mobile station device does not perform to reset the timer based on timing deviation information included in a random access response which is a response to a random access preamble whose preamble ID is randomly selected.

6. A mobile station device which manages a predetermined time as an uplink synchronous status by a timer after receiving a timing deviation information from the base station device, resets the timer based on receiving timing deviation information,

wherein, in the uplink synchronous status, the mobile station device does not perform to reset the timer based on timing deviation information included in a random access response which is a response to a random access preamble whose preamble ID is randomly selected.

7. A processing method of a mobile station device which transmits a random access preamble to a base station device and resets a timer managing an uplink synchronous status based on reception of timing deviation information included in a random access response that the base station device transmits in response to the transmitted random access preamble,

wherein, in the uplink synchronous status, upon reception of a random access response including timing deviation information whose preamble ID is randomly selected by the mobile station device, the mobile station device does not perform to reset the timer based on reception of the timing deviation information.

8. A processing method of a mobile station device which manages a predetermined time as an uplink synchronous status by a timer after receiving a timing deviation information from the base station device, resets the timer based on receiving timing deviation information,

wherein, in the uplink synchronous status, the mobile station device does not perform to reset the timer based on timing deviation information included in a random access response which is a response to a random access preamble whose preamble ID is randomly selected.