INTERFACE BETWEEN BASE STATIONS FOR TOPOLOGY DISCOVERY TO ENABLE COORDINATED RESOURCE USAGE

• US 20150173086A1
• Filed: 12/17/2013
• Published: 06/18/2015
• Est. Priority Date: 12/17/2013
• Status: Active Grant

• Current Assignee: Argela Yazilim Ve Bilisim Teknolojileri San. Ve Tic A.S.
• Original Assignee: Argela Yazilim Ve Bilisim Teknolojileri San. Ve Tic A.S.
• Inventors: KARAMAN, MELIH AHMET, ERGEN, MUSTAFA, GUNEY, NAZLI, CIVANLAR, SEYHAN
• Granted Patent: US 9,392,432 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/22 with access to wired networks
• CPC Class Codes: H04W 92/20 between access points

Abstract

A description of an interface and a system/method is provided to combine frequency, time and power domain resource partitioning between neighbor small cells whereby these cells can execute the resource partitioning, without resorting to a centralized management system, simply by periodically sharing topology-related and interference related information with one another. Such a scheme allows resource partitioning to be executed in real-time as more small cells are deployed into the network.

Claims

1. A method for wireless communications as implemented in a first base station comprising:

transmitting a neighbor topology request message to a second base station, said neighbor topology request message soliciting neighbor topology information regarding one or more neighbors associated with said second base station;

receiving, from the second base station, a neighbor topology response message comprising said neighbor topology information regarding one or more neighbors associated with said second base station; and

partitioning one or more network resources according to said received neighbor topology response message between said first and second base stations.

2. The method of claim 1, wherein said method further comprises:

receiving a reciprocal neighbor topology request message from said second base station, said reciprocal neighbor topology request message soliciting neighbor topology information regarding one or more neighbors associated with said first base station; and

transmitting, to said second base station, another neighbor topology response message comprising said solicited neighbor topology information regarding one or more neighbors associated with said first base station.

3. The method of claim 1, wherein said neighbor topology information regarding one or more neighbors associated with said second base station further comprises one or more parameters associated with a degree of connectivity of said neighbors associated with said second base station.

4. The method of claim 3, wherein said degree of connectivity of said neighbors associated with said second base station is a first-degree of connectivity of said neighbors associated with said second base station.

5. The method of claim 3, wherein said degree of connectivity of said neighbors associated with said second base station is a second-degree of connectivity of said neighbors associated with said second base station.

6. The method of claim 1, wherein said neighbor topology further comprises, for each neighbor base station of said second base station, any of, or a combination of, the following:

received SINR, SIR, an indication of physical distance of each neighbor base station to said second base station.

7. The method of claim 1, wherein said neighbor topology further comprises SINR_thresholds used by second base station and previous SON sniffing time.

8. The method of claim 1, wherein said neighbor topology request message and said neighbor topology response message are received via an X2 or S1 interface.

9. The method of claim 1, wherein said neighbor topology request message and said neighbor topology response message are received via an over-the-air interface.

10. The method of claim 1, where the method further comprises embedding neighbor topology responses/requests in standard messages of X2 setup or eNB configuration update procedure.

11. The method of claim 1, wherein said method further comprises, after receiving said neighbor topology response message, transmitting, to said second base station, a proposed resource adjustment message between said first base station and said second base station.

12. The method of claim 11, wherein said method further comprising:

receiving, from said second base station, a notification that said proposed resource adjustment message was accepted by said second base station, and

adjusting network resource utilization based on said acceptance.

13. The method of claim 11, wherein said proposed resource adjustment message comprises time-slot sharing information between said first base station and second base station.

14. The method of claim 11, wherein said proposed resource adjustment message comprises frequency and time-slot sharing information between said first base station and second base station.

15. The method of claim 11, wherein said method further comprising:

receiving, from said second base station, a notification of rejection of said proposed resource adjustment message; and

receiving, from said second base station, an alternative resource adjustment message.

16. The method of claim 11, wherein said proposed resource adjustment message comprises frequency sub-band sharing information between said first base station and second base station.

17. The method of claim 11, wherein said proposed resource adjustment message comprises proposed power level adjustment by first base station and/or second base station.

18. The method of claim 1, wherein said method further comprising:

determining, based on said received neighbor topology response message, if said second base station is topologically close to cause interference;

identifying frequency sub-bands in use for said second base station;

selecting from an available set of frequency sub-bands, a subset of sub-bands orthogonal to said identified frequency sub-bands in use; and

sending a proposed resource adjustment message to said second base station proposing said selected subset of orthogonal sub-bands.

19. The method of claim 18, wherein said method further comprises receiving, when said proposed resource adjustment message is not accepted by said second base station, an alternative proposed resource adjustment message, and accepting or rejecting said alternative proposed resource adjustment message by sending a notification message.

20. A method for wireless communications as implemented in a first base station comprising:

sending a neighbor topology request message to a second base station, said neighbor topology request message comprising neighbor topology information associated with said first base station and a solicitation for neighbor topology information associated with said second base station;

receiving, from the second base station, a neighbor topology response message, said neighbor topology response message comprising said neighbor topology information associated with said second base station; and

partitioning one or more network resources according to said neighbor topology information associated with said first base station and said neighbor topology information associated with said second base station.

21. A method for wireless communications as implemented in a first base station comprising:

transmitting a first neighbor topology request message to a second base station and a second neighbor topology request message to a third base station, said first and second neighbor topology request messages soliciting neighbor topology information regarding one or more neighbors associated with said second base station and third base station, respectively;

receiving, from the second base station, a first neighbor topology response message comprising said neighbor topology information regarding one or more neighbors associated with said second base station, and receiving, from the third base station, a second neighbor topology response message comprising said neighbor topology information regarding one or more neighbors associated with said third base station;

determining, from said first and second neighbor topology response messages that said first base station has more first degree neighbors than both said second and third base stations; and

reducing power of said first base station based on said determination.

22. The method of claim 21, wherein said method further comprises sending a proposed resource adjustment message to said second and third base stations indicating said power reduction.

23. A method for wireless communications as implemented in a first base station comprising:

transmitting a first neighbor topology request message to a second base station and a second neighbor topology request message to a third base station, said first and second neighbor topology request messages soliciting neighbor topology information regarding one or more neighbors associated with said second base station and third base station, respectively;

receiving, from the second base station, a first neighbor topology response message comprising said neighbor topology information regarding one or more neighbors associated with said second base station, and receiving, from the third base station, a second neighbor topology response message comprising said neighbor topology information regarding one or more neighbors associated with said third base station;

determining, from said first and second neighbor topology response messages that said first base station has same first degree neighbors as said second base station, but more first degree neighbors as said third base station; and

reducing power of either said first base station or said second base station based on said determination and at least one of the following;

total SINR received by each base station, distance-wise closeness of said first base station'"'"'s first degree neighbors, and distance-wise closeness of said second base station'"'"'s first degree neighbors.

24. The method of claim 23, wherein said method further comprises sending a proposed resource adjustment message to said second and third base stations indicating said power reduction.