Radio communication apparatus and radio communication method, and radio communication system

• US 9,590,775 B2
• Filed: 12/26/2012
• Issued: 03/07/2017
• Est. Priority Date: 03/29/2012
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takano, Hiroaki
• Primary Examiner(s): Patel, Parth
• Application Number:
  US14/377,347
• Publication Number:
  US 20150009845A1
• Time in Patent Office: 1,532 Days
• Field of Search: 370/252, 370/336, 370/330
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• 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: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/46 in multi hop networks, e.g. wireless relay networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Uplink CoMP point selection is achieved, considering power consumption of a MTC device and uplink overhead.

Two resource blocks of a first resource block containing a reference signal and a second resource block for transmitting user data are combined to achieve uplink CoMP. The time interval between these two resource blocks is a time of approximately several milliseconds to several tens milliseconds necessary that each eNodeB acquires reception quality to be collected to a Serving eNodeB via the X2 interface and analyze its content.

Claims

1. A radio communication apparatus to operate as a terminal station, the radio communication apparatus comprising:

a reference signal transmission unit configured to transmit a reference signal to be measured by at least one of a plurality of base stations to decide on a coordinating group of base stations, from among the plurality of base stations, for coordinated multi point reception, by a first radio resource allocated to the radio communication apparatus for communication with at least one base station of the coordinating group of base stations; and

a user data transmission unit configured to transmit user data by a second radio resource allocated to the radio communication apparatus,

wherein a time interval based on the measured reference signal is placed between the transmission of the reference signal and the transmission of the user data; and

wherein the first radio resource and the second radio resource are reserved with the at least one base station of the coordinating group of base stations for the coordinated multi point reception.

2. The radio communication apparatus according to claim 1, wherein the reference signal transmission unit is further configured to transmit the reference signal other than a reference signal that is precoded.

3. The radio communication apparatus according to claim 1, wherein the reference signal transmission unit is further configured to transmit the reference signal by a time domain of a part of the first radio resource.

4. The radio communication apparatus according to claim 1, wherein the reference signal transmission unit is further configured to transmit the reference signal by a frequency domain of a part of the first radio resource.

5. The radio communication apparatus according to claim 1, wherein the reference signal transmission unit is further configured to transmit the reference signal multiplexed in coordination with terminal stations other than the terminal station in at least one of time or frequency directions in the first radio resource.

6. A radio communication apparatus to operate as a base station, the radio communication apparatus comprising:

a quality evaluation unit configured to;

measure a reference signal transmitted from a terminal station by a first radio resource allocated to the terminal station for communication with at least one base station of a coordinating group of base stations, and

evaluate quality of a channel;

a measurement result receiving unit configured to receive measurement results of the reference signal at a plurality of base stations, wherein the plurality of base stations are candidates for the coordinating group of base stations for coordinated multi point reception for the terminal station;

a decision unit configured to decide base stations to form the coordinating group of base stations from the plurality of base stations based on the measurement results received by the measurement result receiving unit; and

a decoding unit configured to synthesize received user data by the coordinating group of base stations, wherein the user data is transmitted by the terminal station by a second radio resource,

wherein a time interval based on the measured reference signal is placed between the transmission of the reference signal and the transmission of the user data; and

wherein the first radio resource and the second radio resource are reserved between the terminal station and the at least one base station of a coordinating group of base stations.

7. The radio communication apparatus according to claim 6, further comprising a rescheduling unit configured to reallocate a radio resource in a cell of the radio communication apparatus based on a decision whether to perform coordinated multi point reception for the terminal station.

8. The radio communication apparatus according to claim 6, wherein the decision unit is further configured to decide on base stations to form the coordinating group of base stations based on the measurement results of the reference signal transmitted by a time domain of a part of the first radio resource.

9. The radio communication apparatus according to claim 6, wherein the decision unit is further configured to decide on base stations to form the coordinating group of base stations based on the measurement results of the reference signal transmitted by a frequency domain of a part of the first radio resource.

10. The radio communication apparatus according to claim 6, wherein the decision unit is further configured to decide on base stations to form the coordinating group of base stations based on the measurement results of the reference signal multiplexed in coordination with terminal stations other than the terminal station in at least one of time or frequency directions in the first radio resource.

11. A radio communication apparatus to operate as a base station, the radio communication apparatus comprising:

a quality evaluation unit configured to;

measure a reference signal transmitted from a terminal station by a first radio resource allocated to the terminal station for communication with at least one base station of a coordinating group of base stations, and

evaluate quality of a channel;

a measurement result transmission unit configured to transmit the measurement result by the quality evaluation unit to a serving base station, wherein the serving base station is configured to decide on base stations to form the coordinating group of base stations from a plurality of base stations for coordinated multi point reception for the terminal station; and

a received signal transmission unit configured to transmit, based on a decision-by the serving base station that the radio communication apparatus joins the coordinating group of base stations, to the serving base station, user data transmitted by the terminal station by a second radio resource,

wherein a time interval based on the measured reference signal is placed between the transmission of the reference signal and the transmission of the user data; and

wherein the first radio resource and the second radio resource are reserved between the serving base station and the terminal station.

12. The radio communication apparatus according to claim 11, further comprising a rescheduling unit configured to reallocate a radio resource in a cell of the radio communication apparatus based on a decision whether the radio communication apparatus joins the coordinating group.

13. The radio communication apparatus according to claim 11, wherein the quality evaluation unit is further configured to:

measure the reference signal transmitted by a time domain of a part of the first radio resource, and

evaluate the quality of the channel.

14. The radio communication apparatus according to claim 11, wherein the quality evaluation unit is further configured to:

measure the reference signal transmitted by a frequency domain of a part of the first radio resource, and

evaluate the quality of the channel.

15. The radio communication apparatus according to claim 11, wherein the quality evaluation unit is further configured to:

measure the reference signal multiplexed in coordination with terminal stations other than the terminal station in at least one of time or frequency directions in the first radio resource, and

evaluate the quality of the channel.

16. A radio communication method to operate as a terminal station, the radio communication method comprising:

transmitting a reference signal be measured by at least one of a plurality of base stations to decide on a coordinating group of base stations, from among a plurality of base stations, for coordinated multi point reception, by a first radio resource allocated to the terminal station for communication with at least one base station of the coordinating group of base stations; and

transmitting user data by a second radio resource allocated to the terminal station,

wherein a time interval based on the measured reference signal is placed between the transmission of the reference signal and the transmission of the user data; and

wherein the first radio resource and the second radio resource are reserved between the terminal station, and the at least one base station of the coordinating group of base stations.

17. A radio communication method to operate as a base station, the radio communication method comprising:

measuring a reference signal transmitted from a terminal station using a first radio resource allocated to the terminal station for communication with at least one base station of a coordinating group of base stations;

evaluating quality of a channel;

receiving measurement results of the reference signal at a plurality of base stations being candidates for coordinated multi point reception for the terminal station;

deciding on base stations to form a coordinating group of base stations from the plurality of base stations for coordinated multi point reception for the terminal station in coordination with the base station based on the received measurement results; and

synthesizing received user data by the coordinating group of base stations, the user data being transmitted by the terminal station using a second radio resource

wherein a time interval based on the measured reference signal is placed between the transmission of the reference signal and the transmission of the user data; and

wherein the first radio resource and the second radio resource are reserved between the terminal station and the at least one base station of the coordinating group of base stations.

18. A radio communication method to operate as a base station, the radio communication method comprising:

measuring a reference signal transmitted from a terminal station using a first radio resource allocated to the terminal station for communication with at least one base station of a coordinating group of base stations;

evaluating quality of a channel;

transmitting the measurement result to a serving base station to decide on base stations to form the coordinating group base stations from a plurality of base stations for coordinated multi point reception for the terminal station; and

transmitting, upon having been decided by the serving base station that the base station joins the coordinating group of base stations, to the serving base station, user data transmitted by the terminal station using a second radio resource,

wherein a time interval based on the measured reference signal is placed between the transmission of the reference signal and the transmission of the user data; and

wherein the first radio resource and the second radio resource are reserved between the terminal station and the serving base station.

19. A radio communication system, comprising:

a terminal station configured to transmit a reference signal by a first radio resource allocated to the terminal station for communication with at least one base station of a coordinating group of base stations, and transmit user data by a second radio resource; and

a plurality of base stations each configured to measure the reference signal and form the coordinating group of base stations based on the measurement results of the reference signal for coordinated multi point reception of the user data,

wherein a time interval based on the measured reference signal is placed between the transmission of the reference signal and the transmission of the user data; and

wherein the first radio resource and the second radio resource are reserved between the terminal station and the at least one base station of the coordinating group of base stations.