Base station, terminal, communication system, communication method, and integrated circuit

• US 9,538,397 B2
• Filed: 03/14/2012
• Issued: 01/03/2017
• Est. Priority Date: 03/24/2011
• 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: Shimezawa, Kazuyuki, Imamura, Kimihiko, Nogami, Toshizo
• Primary Examiner(s): Anwar, Mohammad
• Application Number:
  US14/006,830
• Publication Number:
  US 20140016556A1
• Time in Patent Office: 1,756 Days
• Field of Search: 370/328, 370/338
• US Class Current: 1/1
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26134 Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A base station is provided in which a terminal efficiently controls a demodulation reference signal for a data signal transmitted from the base station in a wireless communication system in which the base station and the terminal communicates with each other. The base station that performs a communication with the terminal includes a data signal generation unit that generates a data signal for terminal, and a demodulation reference signal for a data signal multiplexing unit that multiplexes a demodulation reference signal for a data signal, which is a known signal for demodulating the data signal, into the data signal. The scramble code included in the demodulation reference signal for the data signal is generated based on a first scramble ID and a second scramble ID that are notified from the base station to the terminal.

Claims

1. A base station apparatus which is configured to and/or programmed to communicate with a user equipment (UE), the base station apparatus comprising:

a higher layer processor configured to and/or programmed to configure a plurality of values to the UE for UE-specific reference signal generation,

a transmitter configured to and/or programmed to transmit control information on a physical downlink control channel and a UE-specific reference signal associated with a physical downlink shared channel, wherein

a pseudo random sequence used for the UE-specific reference signal is based on at least a value which is one of the plurality of values and a scrambling identity which is given by the control information associated with the physical downlink shared channel, and

the value is determined from the plurality of values on the basis of the scrambling identity.

2. The base station apparatus according to claim 1, wherein

the value corresponds to the scrambling identity.

3. The base station apparatus according to claim 1, wherein

the scrambling identity is given by a field of the control information.

4. A base station apparatus which is configured to and/or programmed to communicate with a user equipment (UE), the base station apparatus comprising:

a transmitter configured to and/or programmed to transmit a demodulation reference signal associate with an x-physical downlink control channel, wherein

a pseudo random sequence used for the demodulation reference signal is based on at least a value which is configured by higher layers and a predetermined scrambling identity,

the predetermined scrambling identity is different from any of scrambling identities for a UE-specific reference signal associated with a physical downlink shared channel, the predetermined scrambling identity'"'"'s value being different from 0 and being different from 1, and

a starting OFDM symbol for x-physical downlink control channel is determined from a higher layer parameter.

5. A user equipment (UE) which is configured to and/or programmed to communicate with a base station apparatus, the UE comprising:

a higher layer processor configured to and/or programmed to configured a plurality of values by the base station apparatus for UE-specific reference signal generation,

a receiver configured to and/or programmed to receive control information on a physical downlink control channel and a UE-specific reference signal associated with a physical downlink shared channel, wherein

a pseudo random sequence used for the UE-specific reference signal is based on at least a value which is one of the plurality of values and a scrambling identity which is given by the control information associated with the physical downlink shared channel, and

the value is determined from the plurality of values on the basis of the scrambling identity.

6. The UE according to claim 5, wherein

the value corresponds to the scrambling identity.

7. The UE according to claim 5, wherein

the scrambling identity is given by a field of the control information.

8. A user equipment (UE) which is configured to and/or programmed to communicate with a base station apparatus, the UE comprising:

a receiver configured to and/or programmed to receive a demodulation reference signal associate with an x-physical downlink control channel, wherein

a pseudo random sequence used for the demodulation reference signal is based on at least a value which is configured by higher layers and a predetermined scrambling identity,

the predetermined scrambling identity is different from any of scrambling identities for a UE-specific reference signal associated with a physical downlink shared channel, the predetermined scrambling identity'"'"'s value being different from 0 and different from 1, and

a starting OFDM symbol for x-physical downlink control channel is determined from a higher layer parameter.