BASE STATION DEVICE, MOBILE STATION DEVICE, COMMUNICATION SYSTEM, TRANSMISSION METHOD, RECEPTION METHOD, AND COMMUNICATION METHOD

• US 20130315191A1
• Filed: 02/03/2012
• Published: 11/28/2013
• Est. Priority Date: 02/10/2011
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yoshimoto, Takashi, Shimezawa, Kazuyuki
• Granted Patent: US 9,713,123 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04J 11/0056 Inter-base station aspects
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

Inter-cell Interference is efficiently mitigated or suppressed in a radio communication system constituting a heterogeneous network. In the radio communication system in which a base station device and a mobile station device communicate with each other, the base station device notifies, to the mobile station device, control information related to a cell-specific reference signal that is specific to a cell ID of another base station device different from the aforesaid base station device, the control information containing information regarding number of ports for the cell-specific reference signal.

Claims

1-15. -15. (canceled)

16. A base station device communicating with a mobile station device,

wherein the base station device notifies, to the mobile station device by RRC signaling, a cell ID of another base station device different from the aforesaid base station device, number of antenna ports for a cell-specific reference signal in the aforesaid other base station device, and subframe information indicating MBSFN subframes that are reserved for MBSFN, which is used as an MBSFN by the aforesaid other base station device.

17. The base station device according to claim 16, wherein the MBSFN subframes include an OFDM symbol area in which the cell-specific reference signal is mapped, and an OFDM symbol area in which the cell-specific reference signal is not mapped.

18. The base station device according to claim 16, wherein the subframe information contains a bitmap indicating MBSFN subframe information contains a bitmap indicating MBSFN subframe allocation in a predetermined number of subframes.

19. A mobile station device communicating with a base station device, wherein the mobile station device receives, from the base station device by RRC signaling, a cell ID of another base station device different from the aforesaid base station device, number of antenna ports for a cell-specific reference signal is the aforesaid other base station device, and subframe information indicating MBSFN subframes that are reserved for MBSFN, which is used as an MBSFN by the aforesaid other base station device.

20. The mobile station device according to claim 19, wherein the mobile station device employs the received information to mitigate interference suffered from the cell-specific reference signal that is transmitted from the aforesaid other base station device.

21. The mobile station device according to claim 19, wherein the MBSFN subframes includes an OFDM symbol area in which the cell-specific reference signal is mapped, and an OFDM symbol area in which the cell-specific reference signal is not mapped.

22. The mobile station device according to claim 19, wherein the subframe information contains a bitmap indicating MBSFN subframe allocation in a predetermined number of subframes.

23. A reception method in a mobile station device communicating with a base station device, the reception method comprising the step of:

receiving, from the base station device by RRC signaling, a cell ID of another base station device different from the aforesaid base station device, number of antenna ports for a cell-specific reference signal in the aforesaid other base station device, and subframe information indicating MBSFN subframes that are reserved for MBSFN, which is used as an MBSFN by the aforesaid other base station device.

24. The reception method according to claim 23, wherein the received information is employed to mitigate interference suffered from the cell-specific reference signal that is transmitted from the aforesaid other base station device.

25. The reception method according to claim 23, wherein the MBSFN subframes include an OFDM symbol area in which the cell-specific reference signal is mapped, and an OFDM symbol area in which the cell-specific reference signal is not mapped.

26. The reception method according to claim 23, wherein the subframe information contains a bitmap indicating MBSFN subframe allocation in a predetermined number of subframes.