METHOD AND SYSTEM FOR SCHEDULING AND MITIGATING CROSS-CELL INTERFERENCE

• US 20170170914A1
• Filed: 12/13/2016
• Published: 06/15/2017
• Est. Priority Date: 12/14/2015
• Status: Active Grant

• Current Assignee: Hughes Systique Private Limited
• Original Assignee: Hughes Systique Private Limited
• Inventors: Saha, Abheek
• Granted Patent: US 10,187,126 B2
• Time in Patent Office: Days
• 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 7/0413 MIMO systems

Abstract

The present invention provides a method and a system for scheduling and mitigating cross-cell interference. The system comprises a plurality of N network nodes, each having a baseband processor and a transmit antenna N_t, capable of handling multiple input multiple output (MIMO) channels, communicatively coupled with a plurality of K co-residents user equipment (UEs); a central scheduler configured to control scheduling of said plurality of network nodes; wherein each network node is configured to select a plurality of UEs and provide the shortlisted UEs to the central scheduler; the central scheduler in turn identifies a target set of UEs and the co-residents for each network node; and the network node is configured to pre-select signal-to-noise power to the target UEs without impacting transmission of co-residents UEs.

Claims

1. A system for scheduling and mitigating cross-cell interference, said system comprising:

a plurality of network nodes, each having a baseband processor and a transmit antenna, configured to handle multiple input multiple output channels, communicatively coupled with a plurality of co-residents user equipment (UEs);

a central scheduler configured to control scheduling of said plurality of network nodes;

wherein each network node is configured to select a plurality of UEs and provide a short list of UEs to the central scheduler;

the central scheduler in turn identifies a target set of UEs and the co-residents for each network node; and

the network node is configured to pre-select signal-to-noise power to the target UEs without impacting transmission of co-residents UEs.

2. The system as claimed in claim 1, wherein the central scheduler identifies the target set of UEs based on orthogonality of the UE'"'"'s channel matrix against those previously present in each nodes target-set.

3. The system as claimed in claim 1, wherein the central scheduler is configured to receive transmission parameters from specific UEs.

4. The system as claimed in claim 3, wherein said transmission parameters comprises channel capacity information for each of the plurality of co-located UEs and power constraint information at each of the network nodes.

5. The system as claimed in claim 1, wherein the network node pre-selects transmission power to the target UEs by implementing pre-coding matrix.

6. The system as claimed in claim 5, wherein the pre-coding matrix is a linear matrix operation, which simultaneously separates the channels of the member UEs of the target set.

7. A method for scheduling and mitigating cross-cell interference, said method comprising:

controlling scheduling, by a central scheduler, of a plurality of network nodes, each having a baseband processor and a transmit antenna, and each network node is configured to handle multiple input multiple output channels, communicatively coupled with a plurality of co-residents user equipment (UEs);

selecting, by each network node, a plurality of UEs;

providing a short list of UEs to the central scheduler;

identifying, by the central scheduler, a target set of UEs and the co-residents for each network node based on the short list of UEs provided by the network node; and

pre-selecting, by the network node, signal-to-noise power for the target UEs without impacting transmission of co-residents UEs.

8. The method as claimed in claim 7, wherein the method comprises identifying, by the central scheduler, the target set of UEs based on orthogonality of the UE'"'"'s channel matrix against those previously present in each nodes target-set.

9. The method as claimed in claim 7, wherein the central scheduler is configured to receive transmission parameters from specific UEs.

10. The method as claimed in claim 9, wherein said transmission parameters comprises channel capacity information for each of the plurality of co-located UEs and power constraint information at each of the network nodes.

11. The system as claimed in claim 7, wherein pre-selecting signal-to-noise power to the target UEs is by implementing pre-coding matrix.

12. The method as claimed in claim 11, wherein the pre-coding matrix is a linear matrix operation, which simultaneously separates the channels of the member UEs of the target set.

13. The method as claimed in claim 7, wherein the scheduling comprises:

sorting the list of all visible UEs in ascending order of the number of nodes;

adding UEs to the target set of that node only visible to one node;

determining UEs visible to multiple nodes, which have to be selected to the node that they will be targeted to; and

checking, the orthogonality of the UE'"'"'s channel matrix against those already present in each nodes target-set.