COORDINATED SET SELECTING METHOD AND DEVICE

• US 20140112288A1
• Filed: 05/02/2012
• Published: 04/24/2014
• Est. Priority Date: 06/28/2011
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Wei, Yuxin
• Granted Patent: US 9,401,785 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• 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: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 72/27 between access points

Abstract

Disclosed are a coordinated set selecting method and device, which are applicable to a wireless communication system. The coordinated set selecting method comprises the following steps: determining a transmission manner adopted by a wireless communication system, the transmission manner being joint processing or coordinated scheduling/beamforming; and, directed to the transmission manner adopted by the wireless communication system, selecting a coordinated set according to a coordinated set selecting mechanism adapting to the transmission manner. According to the technical solution of the present invention, by considering transmission characteristics of different transmission manners, a reasonable coordinated set is selected to perform coordinated multi-point transmission.

Claims

1. A cooperating set selection method for a wireless communication system, comprising the steps of:

determining a transmission mode utilized by the wireless communication system, wherein the transmission mode is Joint Processing or Coordinated Scheduling/Beamforming; and

selecting a cooperating set based on a cooperating set selection mechanism corresponding to the transmission mode utilized by the wireless communication system.

2. The cooperating set selection method according to claim 1, wherein the wireless communication system comprises a homogeneous network and a heterogeneous network, and in the selection of the cooperating set,

a cooperating set selection mechanism for the homogeneous network or the heterogeneous network is utilized further according to different interference characteristics of the homogeneous network and the heterogeneous network.

3. The cooperating set selection method according to claim 2, wherein in a case that the transmission mode of Coordinated Scheduling/Beamforming is utilized by the wireless communication system, the corresponding cooperating set selection mechanism comprises a cell-based selection mechanism, with respect to a first cell on which the cooperating set selection is based, wherein for the homogeneous network, one or more cells whose distances from the first cell are smaller than a predetermined threshold are selected as the cooperating set based on a distance criterion, and for the heterogeneous network, a cooperating set is selected, besides based on the distance criterion, further based on whether the first cell is a macro cell or a micro cell and whether the macro cell and micro cells in the coverage of the macro cell use a same cell number.

4. The cooperating set selection method according to claim 2, wherein in a case that the transmission mode of Coordinated Scheduling/Beamforming is utilized by the wireless communication system, the corresponding cooperating set selection mechanism comprises a terminal-based selection mechanism, with respect to a first terminal and a first cell on which the cooperating set selection is based, wherein if the first cell is located in the homogeneous network, one or more cells whose distances from the first cell are smaller than a predetermined threshold are selected as a candidate cooperating set based on a distance criterion, and if the first cell is located in the heterogeneous network, a candidate cooperating set is selected, besides based on the distance criterion, further based on whether the first cell is a macro cell or a micro cell and whether the macro cell and micro cells in the coverage of the macro cell use a same cell number, then one or more cells whose Signal to Leakage and Noise Ratios, SLNRs, are smaller than a predetermined SLNR threshold, are selected as the cooperating set serving the first terminal based on a SLNR criterion from the candidate cooperating set.

5. The cooperating set selection method according to claim 2, wherein in a case that the transmission mode of Joint Processing is utilized by the wireless communication system, a candidate cooperating set is selected first, then a cooperating cell-user pair set is selected on the basis of the selected candidate cooperating set to form a multi-cell and multi-user transmission mode.

6. The cooperating set selection method according to claim 5, wherein the selection of the candidate cooperating set comprises:

with respect to a first cell on which the cooperating set selection is based, if the first cell is located in the homogeneous network, selecting one or more cells having a physical distance from the first cell smaller than a predetermined distance threshold to form a candidate cooperating set based on a distance criterion, and if the first cell is located in the heterogeneous network, selecting one or more suitable cells to form the candidate cooperating set based on a signal quality criterion, wherein a difference between a first signal quality of an edge user in the first cell served by the suitable cell and a second signal quality of the edge user served by the first cell is no more than a predetermined difference threshold.

7. The cooperating set selection method according to claim 5, wherein the selection of the cooperating cell-user pair set comprises:

for the homogeneous network, selecting a cell-user pair set with an orthogonality greater than a predetermined orthogonality threshold, then selecting the cell-user pair set with best signal quality based on the signal quality criterion, and for the heterogeneous network, on the basis of the selection of the homogeneous network, further selecting the cell-user pair set in which interference caused by a macro cell on a micro cell is smaller than a predetermined interference threshold.

8. A cooperating set selection apparatus for a wireless communication system, comprising:

a transmission mode determining unit, configured to determine a transmission mode utilized by the wireless communication system, wherein the transmission mode is joint processing or coordinated Scheduling/Beamforming; and

a cooperating set selecting unit, configured to select a cooperating set based on a cooperating set selection mechanism corresponding to the transmission mode utilized by the wireless communication system.

9. The cooperating set selection apparatus according to claim 8, wherein the wireless communication system comprises a homogeneous network and a heterogeneous network and the cooperating set selecting unit further uses a cooperating set selection mechanism for the homogeneous network or the heterogeneous network according to different interference characteristics of the homogeneous network and the heterogeneous network in selection of the cooperating set.

10. The cooperating set selection apparatus according to claim 9, wherein, in a case that the transmission mode of Coordinated Scheduling/Beamforming is utilized by the wireless communication system, the corresponding cooperating set selection mechanism comprises a cell-based selection mechanism, with respect to a first cell on which the cooperating set selection is based, wherein for the homogeneous network, one or more cells having a distance from the first cell smaller than a predetermined threshold are selected as a cooperating set based on a distance criterion, and for the heterogeneous network, a cooperating set is selected, besides based on the distance criterion, further based on whether the first cell is a macro cell or a micro cell and whether the macro cell and micro cells in the coverage of the macro cell use a same cell number.

11. The cooperating set selection apparatus according to claim 9, wherein in a case that the transmission mode of Coordinated Scheduling/Beamforming is utilized by the wireless communication system, the corresponding cooperating set selection mechanism comprises a terminal-based selection mechanism, with respect to a first terminal and a first cell on which the cooperating set selection is based, wherein if the first cell is located in the homogeneous network, a cell having a distance from the first cell smaller than a predetermined threshold is selected as a candidate cooperating set based on a distance criterion, and if the first cell is located in the heterogeneous network, a candidate cooperating set is selected, besides based on the distance criterion, further based on whether first cell is a macro cell or a micro cell and whether the macro cell and micro cells in the coverage of the macro cell use a same cell number, then one or more cell having a Signal to Leakage and Noise Ratio, SLNR, smaller than a predetermined SLNR threshold are selected as a cooperating set of the first terminal based on a SLNR criterion in the candidate cooperating set.

12. The cooperating set selection apparatus according to claim 9, wherein in a case that the transmission mode of Joint Processing is utilized by the wireless communication system, a candidate cooperating set is selected first, then a cooperating cell-user pair set is selected on the basis of the selected candidate cooperating set to form a multi-cell and multi-user transmission mode.

13. The cooperating set selection apparatus according to claim 12, wherein the selection of the candidate cooperating set comprises:

with respect to a first cell on which the cooperating set selection is based, if the first cell is located in the homogeneous network, selecting one or more cells having a physical distance from the first cell smaller a predetermined distance threshold to form a candidate cooperating set based on a distance criterion, and if the first cell is located in the heterogeneous network, selecting one or more suitable cells to form the candidate cooperating set based on a signal quality criteria, wherein a difference between a first signal quality of an edge user in the first cell served by the suitable cell and a second signal quality of the edge user served by the first cell is no more than a predetermined difference threshold.

14. The cooperating set selection apparatus according to claim 12, wherein the selection of the cooperating cell-user pair set comprises:

for the homogeneous network, selecting a cell-user pair set with an orthogonality greater than a predetermined orthogonality threshold, then selecting the cell-user pair set having best signal quality based on the signal quality criterion, and for the heterogeneous network, on the basis of the selection of the homogeneous network, further selecting the cell-user pair set in which interference caused by a macro cell on a micro cell is smaller than a predetermined interference threshold.

15. A program product for causing a computer to execute a cooperating set selection method for a wireless communication system, the method comprising:

determining a transmission mode utilized by the wireless communication system, wherein the transmission mode is Joint Processing or Coordinated Scheduling/Beamforming; and

selecting a cooperating set based on a cooperating set selection mechanism corresponding to the transmission mode utilized by the wireless communication system.

16. A computer readable storage medium having computer executable instructions stored thereon which, when executed by a processor, cause the computer to perform a cooperating set selection method for a wireless communication system, the method comprising:

determining a transmission mode utilized by the wireless communication system, wherein the transmission mode is Joint Processing or Coordinated Scheduling/Beamforming; and

selecting a cooperating set based on a cooperating set selection mechanism corresponding to the transmission mode utilized by the wireless communication system.