Methods and systems for X2 link management in wireless communication networks

Patent metadata

Field	Value
Publication number	US-9854483-B2
Application number	US-201514885089-A
Country	US
Kind code	B2
Filing date	Oct 16, 2015
Priority date	Aug 19, 2015
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

This disclosure relates generally to wireless communication networks, and more particularly to methods and systems for managing X2 links in wireless communication networks. In one embodiment, a method includes computing a set of configuration parameters associated with at least one Neighboring Base Station (NBS) using measurement reports received from a plurality of User Equipment (UEs). Thereafter, the method includes determining feasibility of setting up at least one X2 link between a Serving Base Station (SBS) and the at least one NBS based on at least one configuration parameter. Based on the feasibility, the at least one X2 link are created by performing one of activation of an X2 link and initiation of setup of an X2 link for each of the at least one X2 link. Finally, the method includes consolidating the at least one of X2 links based on associated current usage and associated predicted future usage.

First claim

What is claimed is:

1. A method of managing X2 links in a wireless communication network, the method comprising:
computing a set of configuration parameters associated with at least one Neighboring Base Station (NBS) using measurement reports received from a plurality of User Equipment (UEs) communicating with the at least one NBS;
determining feasibility of setting up at least one X2 link between a Serving Base Station (SBS) and the at least one NBS based on at least one configuration parameter in response to receiving an X2 link set up request;
creating, in response to determining the feasibility, the at least one X2 link by performing one of activation of an X2 link and initiation of setup of an X2 link for each of the at least one X2 link based on a current status of each of the at least one X2 link, wherein a current status of an X2 link comprises one of a new link setup requirement and activation of an already established X2 link for one of the at least one NBS;
determining a current usage of each of the at least one X2 link created between the SBS and one of the at least one NBS;
predicting a future usage of each of the at least one X2 link based on UE measurement reports received from the plurality of UEs and at least one configuration parameter; and
consolidating the at least one of X2 links based on associated current usage and associated predicted future usage.

2. The method of claim 1 , wherein the set of configuration parameters is selected from a group comprising a default Nearest Base Station (NBS) List, a measurement Timer, a Threshold Reference Signal Received Power (RSRP) Deviation, a threshold time Interval for link deactivation, threshold non-usage time for an active X2 Link, a handover failure factor, a threshold number User Equipment (UEs), Quality Control Index (QCI) for UEs, maximum X2 links, and a radio link failure factor.

3. The method of claim 1 further comprising determining status for the at least one X2 link based on feasibility of setting up the at least one X2 links.

4. The method of claim 1 , wherein determining current usage of each of the at least one X2 link comprises analyzing handover reports associated with each of the at least one NBS.

5. The method of claim 1 , wherein predicting future usage comprises:
calculating an NBS RSRP change rate for each of the at least one NBS and a SBS RSRP change rate for the SBS based on associated consecutive UE measurement reports received from each UE; and
identifying at least one potential UE for handover based on each NBS RSRP change rate computed for the at least one NBS and the SBS RSRP change rate.

6. The method of claim 5 further comprising:
computing, for each UE associated with SBS and the at least one NBS, a predicted RSRP SBS value and a predicted RSRP NBS value; and
verifying, for each UE associated with SBS and the at least one NBS, associated predicted RSRP SBS value and associated predicted RSRP NBS value with threshold limit of RSRP error deviation.

7. The method of claim 6 , wherein consolidating comprises:
computing a predicted non-usage time of each of the at least one X2 link based on an associated predicted RSRP SBS value and an associated predicted RSRP NBS value; and
terminating one of the at least one X2 link when associated predicted non-usage time is greater than a threshold non-usage time for an active X2 link.

8. The method of claim 1 , wherein consolidating comprises recreating one of the at least one X2 link based on comparison of total number of UEs, quality control index of each UE, and number of X2 links with respective thresholds.

9. The method of claim 1 further comprising determining network resources required for using and maintaining the at least one X2 link in response to creating the at least one X2 link.

10. A system for managing X2 links in a wireless communication network, the system comprising:
at least one processor; and
a non-transitory computer-readable medium storing instructions that, when executed by the at least one processor, cause the at least one processor to perform operations comprising:
computing a set of configuration parameters associated with at least one Neighboring Base Station (NBS) using measurement reports received from a plurality of User Equipment (UEs) communicating with the at least one NBS;
determining feasibility of setting up at least one X2 link between a Serving Base Station (SBS) and the at least one NBS based on at least one configuration parameter in response to receiving an X2 link set up request;
creating, in response to determining the feasibility, the at least one X2 link by performing one of activation of an X2 link and initiation of setup of an X2 link for each of the at least one X2 link based on current status of each of the at least one X2 link, wherein current status of an X2 link comprises one of a new link setup requirement and activation of an already established X2 link for one of the at least one NBS;
determining a current usage of each of the at least one X2 link created between the SBS and one of the at least one NBS;
predicting a future usage of each of the at least one X2 link based on UE measurement reports received from the plurality of UEs and at least one configuration parameter; and
consolidating the at least one of X2 links based on associated current usage and associated predicted future usage.

11. The system of claim 10 , wherein the operations further comprise determining status for the at least one X2 link based on feasibility of setting up the at least one X2 links.

12. The system of claim 10 , wherein the operation of determining current usage of each of the at least one X2 link comprises operation of analyzing handover reports associated with each of the at least one NBS.

13. The system of claim 10 , wherein the operation of predicting future usage comprises operation of:
calculating an NBS RSRP change rate for each of the at least one NBS and a SBS RSRP change rate for the SBS based on associated consecutive UE measurement reports received from each UE; and
identifying at least one potential UE for handover based on each NBS RSRP change rate computed for the at least one NBS and the SBS RSRP change rate.

14. The system of claim 13 , wherein the operations further comprise:
computing, for each UE associated with SBS and the at least one NBS, a predicted RSRP SBS value and a predicted RSRP NBS value; and
verifying, for each UE associated with SBS and the at least one NBS, associated predicted RSRP SBS value and associated predicted RSRP NBS value with threshold limit of RSRP error deviation.

15. The system of claim 14 , wherein operation of consolidating further comprises the operation of:
computing a predicted non-usage time of each of the at least one X2 link based on an associated predicted RSRP SBS value and an associated predicted RSRP NBS value; and
terminating one of the at least one X2 link when associated predicted non-usage time is greater than a threshold non-usage time for an active X2 link.

16. The system of claim 1 , wherein the operation of consolidating comprises the operation of recreating one of the at least one X2 link based on comparison of total number of UEs, quality control index of each UE, and number of X2 links with respective thresholds.

17. The system of claim 10 , wherein the operations further comprise determining network resources required for using and maintaining the at least one X2 link in response to creating the at least one X2 link.

18. The system of claim 10 , wherein the set of configuration parameters is

Assignees

• Wipro Ltd

Inventors

• Chaudhuri Saptarshi
• Manna Avijit
• Pal Shyam Sundar

Classifications

• H04W36/0083

  Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists · CPC title

• H04W92/20

  between access points · CPC title

• H04W36/0061 Primary

  of neighbour cell information · CPC title

• H04W36/0085

  Hand-off measurements · CPC title

• H04W36/00835

  Determination of neighbour cell lists · CPC title