Method for managing heterogeneous cellular networks

• US 9,877,237 B2
• Filed: 08/21/2015
• Issued: 01/23/2018
• Est. Priority Date: 12/04/2012
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Nuss, Ziv, Mizrahi, Itay Meir
• Primary Examiner(s): Renner, Brandon
• Assistant Examiner(s): Vogel, Jay
• Application Number:
  US14/832,148
• Publication Number:
  US 20150365855A1
• Time in Patent Office: 886 Days
• Field of Search: None
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A method is provided for managing heterogeneous cellular networks. The method comprises obtaining measurement reports from wireless entities relating to the intensity at which signals are received by each wireless entity; based on these measurement reports, and/or on geographical information of HetNet elements, identifying a macro cell located at the vicinity of the small cells; selecting one of the small cells to be a gateway cell, and other small cells to be inner cells. The gateway cell is a small cell that receives, or mobile terminals connected thereto receive, signals transmitted by the macro cell at an intensity being at least similar to intensity at which these signals are received at the inner cells; identifying physical layer identifiers (PLIs) used at the macro cell; and determining PLIs for the gateway cell which are not currently used by the macro cell, and PLIs available for use by the inner cells.

Claims

1. A method for managing a heterogeneous cellular network comprising at least one macro cell and a plurality of small cells, the method comprising:

defining a geographical area and identifying all macro cells included within the defined geographical area;

obtaining, by a management entity, measurement reports generated by wireless entities currently operating within the defined geographical area, wherein the measurement reports comprise information associated, at least in part, with a measured signal intensity at which communication signals are received by each respective one of the wireless entities from each respective base stations serving all macro cells and all small cells of the plurality of small cells included within the defined geographical area;

based on the measurement reports obtained, creating one or more neighbors'"'"' relations lists for groups of small cells located within all macro cells included in the defined geographical area by using virtual cell identifiers (IDs) for small cells belonging to the groups; and

selecting, by the management entity, at least one small cell to be a gateway cell for a particular group of small cells located in a vicinity of at least one macro cell served by a base station, wherein the at least one small cell is selected to be the gateway cell based, at least in part, on a measured signal intensity at which communication signals received from the base station serving the at least one macro cell have the highest measured signal intensity from the measurement reports of any other small cell among the particular group of small cells and wherein the gateway cell is configured with a unique physical layer identifier (PLI) selected from a list of available PLIs that are not currently used by the at least one macro cell or the particular group of small cells.

2. The method of claim 1, further comprising:

dynamically updating the one or more neighbors'"'"' relations lists established in response to a change detected in measurement reports.

3. The method of claim 1, further comprising:

selecting a plurality of other small cells from the plurality of small cells to be a group of inner-grid cells associated with the gateway cell, wherein the gateway cell is selected to handle handover for wireless entities from the base station serving the at least one macro cell to the particular group of small cells.

4. The method of claim 3, wherein the group of inner-grid small cells is included in the neighbors'"'"' relations list under a single entry associated with the unique PLI of the gateway cell.

5. The method of claim 1, wherein the measured signal intensity is associated with the measured signal intensity at which the communication signals transmitted by the base station serving the at least one macro cell are received by one or more wireless entities in a vicinity of the gateway cell.

6. The method of claim 1, wherein the measured signal intensity is associated with the measured signal intensity at which the communication signals transmitted by the base station serving the at least one macro cell are received by the gateway cell.

7. One or more non-transitory tangible media encoding logic that includes instructions for execution by a processor, wherein the execution causes the processor to perform operations for managing a heterogeneous cellular network comprising at least one macro cell and a plurality of small cells, the operations comprising:

defining a geographical area and identifying all macro cells included within the defined geographical area;

obtaining, by a management entity, measurement reports generated by wireless entities currently operating within the defined geographical area, wherein the measurement reports comprise information associated, at least in part, with a measured signal intensity at which communication signals are received by each respective one of the wireless entities from each respective base station serving all macro cells and all small cells of the plurality of small cells included within the defined geographical area;

based on the measurement reports obtained, creating one or more neighbors'"'"' relations lists for groups of small cells located within all macro cells included in the defined geographical area by using virtual cell identifiers (IDs) for small cells belonging to the groups;

and selecting, by the management entity, at least one small cell to be a gateway cell for a particular group of small cells located in a vicinity of at least one macro cell served by a base station, wherein the at least one small cell is selected to be the gateway cell based, at least in part, on a measured signal intensity at which communication signals received from the base station serving the at least one macro cell have the highest measured signal intensity from the measurement reports of any other small cell among the particular group of small cells and wherein the gateway cell is configured with a unique physical layer identifier (PLI) selected from a list of available PLIs that are not currently used by the at least one macro cell or the particular group of small cells.

8. The media of claim 7, wherein the execution causes the processor to perform further operations, comprising:

dynamically updating the one or more neighbors'"'"' relations lists established in response to a change detected in measurement reports.

9. The media of claim 7, wherein the execution causes the processor to perform further operations, comprising:

selecting a plurality of other small cells from the plurality of small cells to be a group of inner-grid cells associated with the gateway cell, wherein the gateway cell is selected to handle handover for wireless entities from the base station serving the at least one macro cell to the particular group of small cells.

10. The media of claim 9, wherein the group of inner-grid small cells is included in the neighbors'"'"' relations list under a single entry associated with the unique PLI of the gateway cell.

11. The media of claim 9, wherein the measured signal intensity is associated with the measured signal intensity at which the communication signals transmitted by the base station serving the at least one macro cell are received by one or more wireless entities in a vicinity of the gateway cell.

12. The media of claim 9, wherein the measured signal intensity is associated with the measured signal intensity at which the communication signals transmitted by the base station serving the at least one macro cell are received by the gateway cell.

13. A system for managing a heterogeneous cellular network comprising at least one macro cell and a plurality of small cells, the system comprising a computing platform being in communication with the heterogeneous cellular network and being configured for:

defining a geographical area and identifying all macro cells included within the defined geographical area;

obtaining, by the computing platform, measurement reports generated by wireless entities currently operating within the defined geographical area, wherein the measurement reports comprise information associated, at least in part, with a measured signal intensity at which communication signals are received by each respective one of the wireless entities from each respective base station serving all macro cells and all small cells of the plurality of small cells included within the defined geographical area;

based on the measurement reports obtained, creating one or more neighbors'"'"' relations lists for groups of small cells located within all macro cells included in the defined geographical area by using virtual cell identifiers (IDs) for small cells belonging to the groups;

and selecting, by the computing platform, at least one small cell to be a gateway cell for a particular group of small cells located in a vicinity of at least one macro cell served by a base station, wherein the at least one small cell is selected to be the gateway cell based, at least in part, on a measured signal intensity at which communication signals received from the base station serving the at least one macro cell have the highest measured signal intensity from the measurement reports of any other small cell among the particular group of small cells and wherein the gateway cell is configured with a unique physical layer identifier (PLI) selected from a list of available PLIs that are not currently used by the at least one macro cell or the particular group of small cells.

14. The system of claim 13, being further configured for:

dynamically updating the one or more neighbors relations lists established in response to a change detected in measurement reports.

15. The system of claim 13, being further configured for:

selecting a plurality of other small cells from the plurality of small cells to be a group of inner-grid cells associated with the gateway cell, wherein the gateway cell is selected to handle handover for wireless entities from the base station serving the at least one macro cell to the particular group of small cells.

16. The system of claim 15, wherein the group of inner-grid small cells is included in the neighbors'"'"' relations list under a single entry associated with the unique PLI of the gateway cell.

17. The system of claim 13, wherein the measured signal intensity is associated with the measured signal intensity at which the communication signals transmitted by the base station serving the at least one macro cell are received by one or more wireless entities in a vicinity of the gateway cell.

18. The system of claim 13, wherein the measured signal intensity is associated with the measured signal intensity at which the communication signals transmitted by the base station serving the at least one macro cell are received by the gateway cell.