Wireless communication system, wireless base station, and mobile station

• US 20060146751A1
• Filed: 07/08/2005
• Published: 07/06/2006
• Est. Priority Date: 12/17/2004
• Status: Active Grant

• Current Assignee: Lenovo Singapore Pte Limited (Lenovo Group Ltd.)
• Original Assignee: Fujitsu Limited
• Inventors: Yano, Tetsuya, Obuchi, Kazuhisa, Miyazaki, Shunji
• Granted Patent: US 7,653,026 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point

Abstract

Data transport which allows for handover is implemented by a mobile wireless communication system wherein a first datum is transmitted by a wireless base station, in response to the reception of which a mobile station transmits a second datum, in response to the reception of which the wireless base station transmits a third datum, which is received by the mobile station, the mobile station comprising a control unit which performs changeover of the reception channel for the first datum before changeover of the reception channel for the third datum during handover.

Claims

1. A mobile wireless communication system wherein a first datum is transmitted by a wireless base station, in response to the reception of which a mobile station transmits a second datum, in response to the reception of which the wireless base station transmits a third datum, which is received by the mobile station, the mobile station comprising:

a control unit which performs changeover of the reception channel for the first datum before changeover of the reception channel for the third datum during handover.

2. A wireless communication system as set forth in claim 1, wherein the first datum is transmitted via CPICH, the second datum is CQI, and the third datum is transmitted via HS-SCCH.

3. A wireless communication system as set forth in claim 1, wherein the changeover of the reception channel for the first datum comes first in the channel changeover during handover.

4. A wireless communication system as set forth in claim 1, wherein changeover of the transmission destination of the second datum occurs after changeover of the reception channel for the first datum and before changeover of the reception channel for the third datum.

5. A wireless communication system as set forth in claim 1, wherein changeover of the transmission destination of the second datum occurs after changeover of the reception channel for the third datum, and at least the second data generated in response to a first datum for which reception was initiated after a previously performed changeover of the reception channel for the first datum is transmitted to the changeover destination.

6. A wireless communication system as set forth in claim 1, further comprising a forwarding unit which forwards, from the changeover source wireless base station to the changeover destination wireless base station, second data which is generated according to first data for which reception was initiated after previously performed reception channel changeover for the first data and which is transmitted by the mobile station before the transmission destination of the second data is changed through handover.

7. A wireless communication system as set forth in claim 1, wherein, when the mobile station transmits a fourth datum to the wireless base station upon receipt of the third datum, the control unit of the mobile station changes the transmission destination of the fourth datum after changeover of the reception channel for the third datum.

8. A wireless communication system as set forth in claim 1, wherein, if there is a misalignment in frame timing between the changeover source and changeover destination wireless base stations, the reception timing misalignment of the first datum is compensated when receiving a first datum corresponding to a second datum which is first transmitted after changeover of the transmission destination for the second datum.

9. A wireless base station which transmits a third datum to a mobile station in response to a second datum received from the mobile station in response to the transmission of a first datum, the wireless base station comprising:

an acquisition unit which, at the time of handover, acquires the second datum transmitted by the mobile station in response to a first datum already transmitted by the wireless base station prior to changeover of the reception channel for the third datum by the mobile station; and

a control unit which transmits the third datum to the mobile station in accordance with the result of the acquisition.

10. A mobile station which transmits a second datum in response to the reception of a first datum transmitted from a wireless base station, and receives a third datum transmitted from the wireless base station in response to the reception of the second datum, the mobile station comprising:

a control unit which, at the time of handover, performs the changeover of the reception channel for the first datum before the changeover of the reception channel for the third datum.