METHOD AND DEVICE FOR MANAGING INTERFERENCE IN NEIGHBOURING CELLS HAVING MULTIPLE SENDING AND RECEIVING NODES

• US 20130078991A1
• Filed: 09/20/2010
• Published: 03/28/2013
• Est. Priority Date: 09/23/2009
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Nam, Junyoung
• Granted Patent: US 9,185,599 B2
• Time in Patent Office: Days
• US Class Current: 455/423
• 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: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0077 Cooperative coding
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

Disclosed is method for controlling interference in a wireless system having multiple sending and receiving nodes. In the method for controlling interference in a wireless system having multiple sending and receiving nodes, a plurality of receiving nodes share each other'"'"'s channel information, each of the receiving nodes uses the shared channel information to calculate a precoding matrix which is fed back to the sending nodes, and each of the sending nodes uses each of the precoding matrices received as feedback to transmit a send signal to the receiving nodes, thereby controlling interference. Complete interference alignment can be achieved even by just sharing channel information between receiving nodes, and the invention can be employed not only for inter-cell interference but also for intra-cell interference environments.

Claims

1. An interference control method in a wireless system having multiple transmission/reception nodes, comprising:

performing, by one of a plurality of reception nodes belonging to a predetermined group, a user equipment (UE) pairing procedure with a transmission node; and

performing, by the one reception node, a channel information sharing procedure of sharing channel information with other reception node belonging to the predetermined group.

2. The interference control method according to claim 1, wherein the predetermined group includes a plurality of UEs located in an edge of a plurality of cells and affected by strong interference as the plurality of reception nodes.

3. The interference control method according to claim 2, wherein the one reception node is a master UE.

4. The interference control method according to claim 3, wherein the UE pairing procedure includes:

receiving, by the master UE, pilot signals transmitted from neighboring cells to perform channel measurement; and

reporting, by the master UE, cell identities (IDs) of neighboring cells having strong interference to the master UE'"'"'s serving cell.

5. The interference control method according to claim 4, wherein the UE pairing procedure further includes collecting, by the serving cell, notifications of the IDs of the neighboring cells having the strong interference from UEs of the cell edge, classifying a user group located in an overlapped region between the serving cell and the neighboring cells, and assigning signaling and data resources predefined between the serving cell and the neighboring cells to UEs of the overlapped region.

6. The interference control method according to claim 3, wherein the channel information sharing procedure includes transmitting and receiving channel information of the plurality of reception nodes via device-to-device (D2D) between the plurality of reception nodes belonging to the predetermined group.

7. The interference control method according to claim 6, wherein the channel information sharing procedure includes deciding, by the master UE, a precoding matrix of each UE within the user group by using channel information of the plurality of reception nodes.

8. The interference control method according to claim 7, wherein the channel information sharing procedure further includes transmitting, by the master UE, the decided precoding matrix to each UE within the user group.

9. The interference control method according to claim 8, further comprising feeding, by each reception node, the precoding matrix decided using the shared channel information back to the transmission node.

10. The interference control method according to claim 3, wherein the channel information sharing procedure includes transmitting and receiving channel information of the plurality of reception nodes via an ad-hoc network between the plurality of reception nodes belonging to the predetermined group.

11. An interference control method in a multiuser system, comprising:

mutually sharing, by reception nodes belonging to a predetermined group, channel information; and

calculating, by each reception node, a precoding matrix using the shared channel information and feeding the precoding matrix back to a transmission node.

12. The interference control method according to claim 11, wherein each reception node controls interference between users by calculating the precoding matrix for interference control, feeding the precoding matrix back to the transmission node, and performing an interference alignment or coordinated scheduling/coordinated beamforming (CS/CB) coordinated multi-point transmission (CoMP).

13. The interference control method according to claim 11, wherein the predetermined group includes a plurality of user equipments (UEs) located in an edge of a plurality of cells and affected by strong interference.

14. The interference control method according to claim 11, further comprising receiving, by each reception node, pilot signals from neighboring cells around the each reception node to perform channel measurement.