TERMINAL APPARATUS, BASE STATION APPARATUS, INTEGRATED CIRCUIT, AND COMMUNICATION METHOD

• US 20160157246A1
• Filed: 07/10/2014
• Published: 06/02/2016
• Est. Priority Date: 07/11/2013
• 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: Suzuki, Shoichi, Nogami, Toshizo, Aiba, Tatsushi, Yokomakura, Kazunari
• Granted Patent: US 9,867,204 B2
• Time in Patent Office: Days
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A terminal apparatus includes a reception unit that receives first information indicating a subframe in which a CRS is present, and second information which indicates the number of CRS antenna ports and is used to determine a resource element to which a PDSCH is mapped. In a subframe other than a subframe indicated as the subframe in which the CRS is present by the first information, a resource element to which a PDSCH transmitted through an antenna port different from a CRS antenna port for a serving cell is mapped is based on the number of CRS antenna ports indicated by the second information corresponding to the PDSCH. Accordingly, the terminal apparatus can efficiently communicate with a base station apparatus using a downlink physical channel.

Claims

1-18. -18. (canceled)

19. A terminal apparatus that is configured to communicate with a base station apparatus, the terminal apparatus comprising:

a reception circuit configured to and/or programmed to receive first information indicating a subframe in which a cell-specific reference signal (CRS) is present, and second information which indicates the number of CRS antenna ports and is used to determine a resource element to which a physical downlink control channel (PDSCH) is mapped,

wherein, in a subframe other than a subframe indicated as the subframe in which the CRS is present by the first information, a resource element to which a PDSCH transmitted through an antenna port different from a CRS antenna port for a serving cell is mapped is based on the number of CRS antenna ports indicated by the second information corresponding to the PDSCH.

20. The terminal apparatus according to claim 19,

wherein the reception circuit is configured to and/or programmed to receive third information indicating a third ratio between a first ratio of PDSCH energy per resource element (EPRE) to CRS EPRE of a serving cell and a second ratio of PDSCH EPRE to CRS EPRE of a serving cell, and

in the subframe other than the subframe indicated as the subframe in which the CRS is present by the first information, an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first ratio and an OFDM symbol corresponding to the second ratio are based on the number of CRS antenna ports of the serving cell.

21. The terminal apparatus according to claim 19,

wherein the reception circuit is configured to and/or programmed to receive third information indicating a third ratio between a first ratio of PDSCH energy per resource element (EPRE) to CRS EPRE of a serving cell and a second ratio of the PDSCH EPRE to the CRS EPRE of the serving cell, and

in the subframe other than the subframe indicated as the subframe in which the CRS is present by the first information, an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first ratio and an OFDM symbol corresponding to the second ratio are based on the number of CRS antenna ports indicated by the second information corresponding to the PDSCH.

22. A communication method used in a terminal apparatus that is configured to communicate with a base station apparatus, the communication method comprising:

receiving first information indicating a subframe in which a cell-specific reference signal (CRS) is present, and second information which indicates the number of CRS antenna ports and is used to determine a resource element to which a physical downlink control channel (PDSCH) is mapped,

wherein, in a subframe other than a subframe indicated as the subframe in which the CRS is present by the first information, a resource element to which a PDSCH transmitted through an antenna port different from a CRS antenna port for a serving cell is mapped is based on the number of CRS antenna ports indicated by the second information corresponding to the PDSCH.

23. The communication method according to claim 22, further comprising:

receiving third information indicating a third ratio between a first ratio of PDSCH energy per resource element (EPRE) to CRS EPRE of a serving cell and a second ratio of the PDSCH EPRE to the CRS EPRE of the serving cell,

wherein, in the subframe other than the subframe indicated as the subframe in which the CRS is present by the first information, an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first ratio and an OFDM symbol corresponding to the second ratio are based on the number of CRS antenna ports of the serving cell.

24. The communication method according to claim 22, further comprising:

receiving third information indicating a third ratio between a first ratio of PDSCH energy per resource element (EPRE) to CRS EPRE of a serving cell and a second ratio of the PDSCH EPRE to the CRS EPRE of the serving cell,

wherein, in the subframe other than the subframe indicated as the subframe in which the CRS is present by the first information, an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first ratio and an OFDM symbol corresponding to the second ratio are based on the number of CRS antenna ports indicated by the second information corresponding to the PDSCH.

25. A base station apparatus that is configured to communicate with a terminal apparatus, the base station apparatus comprising:

a transmission circuit configured to and/or programmed to transmit first information indicating a subframe in which a cell-specific reference signal (CRS) is present, and second information which indicates the number of CRS antenna ports and is used to determine a resource element to which a physical downlink control channel (PDSCH) is mapped,

wherein, in a subframe other than a subframe indicated as the subframe in which the CRS is present by the first information, a resource element to which a PDSCH transmitted through an antenna port different from a CRS antenna port for a serving cell is mapped is based on the number of CRS antenna ports indicated by the second information corresponding to the PDSCH.

26. The base station apparatus according to claim 25,

wherein the transmission circuit is configured to and/or programmed to transmit third information indicating a third ratio between a first ratio of PDSCH energy per resource element (EPRE) to CRS EPRE of a serving cell and a second ratio of the PDSCH EPRE to the CRS EPRE of the serving cell, and

in the subframe other than the subframe indicated as the subframe in which the CRS is present by the first information, an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first ratio and an OFDM symbol corresponding to the second ratio are based on the number of CRS antenna ports of the serving cell.

27. The base station apparatus according to claim 25,

wherein the transmission circuit is configured to and/or programmed to transmit third information indicating a third ratio between a first ratio of PDSCH energy per resource element (EPRE) to CRS EPRE of a serving cell and a second ratio of the PDSCH EPRE to the CRS EPRE of the serving cell, and

in the subframe other than the subframe indicated as the subframe in which the CRS is present by the first information, an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first ratio and an OFDM symbol corresponding to the second ratio are based on the number of CRS antenna ports indicated by the second information corresponding to the PDSCH.

28. A communication method used in a base station apparatus that is configured to communicate with a terminal apparatus, the communication method comprising:

transmitting first information indicating a subframe in which a cell-specific reference signal (CRS) is present, and second information which indicates the number of CRS antenna ports and is used to determine a resource element to which a physical downlink control channel (PDSCH) is mapped,

wherein, in a subframe other than a subframe indicated as the subframe in which the CRS is present by the first information, a resource element to which a PDSCH transmitted through an antenna port different from a CRS antenna port for a serving cell is mapped is based on the number of CRS antenna ports indicated by the second information corresponding to the PDSCH.

29. The communication method according to claim 28, further comprising:

transmitting third information indicating a third ratio between a first ratio of PDSCH energy per resource element (EPRE) to CRS EPRE of a serving cell and a second ratio of the PDSCH EPRE to the CRS EPRE of the serving cell,

wherein, in the subframe other than the subframe indicated as the subframe in which the CRS is present by the first information, an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first ratio and an OFDM symbol corresponding to the second ratio are based on the number of CRS antenna ports of the serving cell.

30. The communication method according to claim 28, further comprising:

transmitting third information indicating a third ratio between a first ratio of PDSCH energy per resource element (EPRE) to CRS EPRE of a serving cell and a second ratio of the PDSCH EPRE to the CRS EPRE of the serving cell,

wherein, in the subframe other than the subframe indicated as the subframe in which the CRS is present by the first information, an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first ratio and an OFDM symbol corresponding to the second ratio are based on the number of CRS antenna ports indicated by the second information corresponding to the PDSCH.