METHOD AND APPARATUS FOR WIRELESS LINK RECOVERY BETWEEN BSS IN A WIRELESS COMMUNICATION SYSTEM

• US 20140185434A1
• Filed: 12/23/2013
• Published: 07/03/2014
• Est. Priority Date: 01/02/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: KIM, Sang-Jin, KANG, Hyun-Jeong
• Granted Patent: US 9,729,388 B2
• Time in Patent Office: Days
• US Class Current: 370/228
• CPC Class Codes: H04L 41/0668 by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition

Abstract

An operating method of a Base Station (BS) in a wireless communication system supporting a wireless link based communication between BSs is provided. The method includes, if a wireless link with a counterpart BS is interrupted, transmitting a report on the wireless link interruption to a management server, receiving information about at least one candidate BS for a detour path from the management server, determining a detour path with the counterpart BS on the basis of the information about the at least one candidate BS, and performing communication with the counterpart BS through the detour path.

Claims

1. An operating method of a Base Station (BS) in a wireless communication system supporting a wireless link based communication between BSs, the method comprising:

if a wireless link with a counterpart BS is interrupted, transmitting a report on the wireless link interruption to a management server;

receiving information about at least one candidate BS for a detour path from the management server;

determining a detour path with the counterpart BS on the basis of the information about the at least one candidate BS; and

performing communication with the counterpart BS through the detour path.

2. The method of claim 1, wherein the determining of the detour path comprises determining, as the detour path, a path going through one candidate BS received from the management server.

3. The method of claim 1, wherein the determining of the detour path comprises determining, as the detour path, a path going through one of a plurality of candidate BSs received from the management server.

4. The method of claim 3, wherein the determining of the detour path further comprises:

transmitting probe packets targeting the counterpart BS through paths going through the plurality of candidate BSs respectively; and

determining as the detour path a path through which a response packet to the probe packet is received within the shortest time, from among the paths going through the plurality of candidate BSs respectively.

5. The method of claim 1, further comprising, if a direct wireless link with the counterpart BS is recovered, releasing the detour path.

6. The method of claim 1, further comprising, upon a power-on or a wake-up of the BS, transmitting information related to fronthaul construction to the management server,

wherein the information related to the fronthaul construction comprises at least one of a value indicating a location of the BS, a value indicating a hardware performance/state of the BS, and a value indicating a wireless link state/quality of the BS with other BSs.

7. The method of claim 1, further comprising, if an event for a report to the management server occurs, transmitting information notifying a state change causing the event to the management server,

wherein the event comprises at least one of wireless link interruption, Radio Frequency (RF) chain state change, and link state change.

29. At least one non-transitory processor readable medium for storing a computer program of instructions configured to be readable by at least one processor for instructing the at least one processor to execute a computer process for performing the method as recited in claim 1.

8. An operating method of a management server in a wireless communication system supporting a wireless link based communication between Base Stations (BSs), the method comprising:

if a report on wireless link interruption between a 1st BS and a 2nd BS is received from the 1st BS, searching neighboring BSs of the 1st BS;

selecting at least one candidate BS that will provide a detour path between the 1st BS and the 2nd BS, from among the neighboring BSs; and

transmitting information about the at least one candidate BS to the 1st BS.

9. The method of claim 8, wherein the selecting of the at least one candidate BS comprises selecting of the at least one candidate BS on the basis of at least one of coverage per Radio Frequency (RF) chain of the neighboring BSs, of a state per RF chain of the neighboring BSs, of a wireless link quality per RF chain of the neighboring BSs, and of a distance between each of the neighboring BSs and the 2nd BS.

10. The method of claim 9, wherein the selecting of the at least one candidate BS comprises:

excluding at least one RF chain whose coverage does not include the direction of the 1st BS or the 2nd BS, or which is in an abnormal state, from among RF chains of the neighboring BSs;

selecting at least one RF chain whose link quality with the 1st BS and with the 2nd BS is equal to or is greater than a threshold value, or from a list of an order of superior link quality; and

selecting, as the candidate BS, at least one neighboring BS from a list of an order of shortest distance from the 1st BS and the 2nd BS, or which has a distance equal to or less than a threshold value, from among neighboring BSs possessing at least one of the selected at least one RF chain.

11. The method of claim 8, wherein the selecting of the at least one candidate BS comprises, when selecting a candidate BS for a 3-hop detour path, selecting at least one candidate BS for providing a 2-hop detour path between the neighboring BS of the 1st BS and the 2nd BS.

12. The method of claim 8, wherein the information about the at least one candidate BS comprises at least one of a value capable of identifying a BS and a path corresponding to each candidate BS.

13. The method of claim 8, further comprising managing a management table which registers information of BSs related to fronthaul construction.

14. The method of claim 13, wherein the management table comprises at least one selected from among a value indicating a location of each BS, a value indicating a hardware performance/state of each BS, and a value indicating a wireless link state/quality of each BS with other BSs.

15. A Base Station (BS) apparatus in a wireless communication system supporting a wireless link based communication between BSs, the apparatus comprising:

a backhaul communication unit configured to, if a wireless link with a counterpart BS is interrupted, transmit a report on the wireless link interruption to a management server, and receive information about at least one candidate BS for a detour path from the management server;

a control unit configured to determine a detour path with the counterpart BS on the basis of the at least one candidate BS; and

a fronthaul communication unit configured to perform communication with the counterpart BS through the detour path.

16. The apparatus of claim 15, wherein the control unit determines, as the detour path, a path going through one candidate BS received from the management server.

17. The apparatus of claim 15, wherein the control unit determines, as the detour path, a path going through one of a plurality of candidate BSs received from the management server.

18. The apparatus of claim 17, wherein the control unit transmits probe packets targeting the counterpart BS through paths going through the plurality of candidate BSs, respectively, and determines, as the detour path, a path through which a response packet to the probe packet is received within the shortest time, from among the paths going through the plurality of candidate BSs respectively.

19. The apparatus of claim 15, wherein, if a direct wireless link with the counterpart BS is recovered, the control unit releases the detour path.

20. The apparatus of claim 15, wherein, upon a power-on or a wake-up of the BS, the backhaul communication unit transmits information related to fronthaul construction to the management server, and

wherein the information related to the fronthaul construction comprises at least one of a value indicating a location of the BS, a value indicating a hardware performance/state of the BS, and a value indicating a wireless link state/quality of the BS with other BSs.

21. The apparatus of claim 15, wherein, if an event for a report to the management server occurs, the backhaul communication unit transmits information indicating a state change which caused the event to the management server, and

wherein the event comprises at least one of a wireless link interruption, a Radio Frequency (RF) chain state change, and a link state change.

22. A management server apparatus in a wireless communication system supporting a wireless link based communication between Base Stations (BSs), the apparatus comprising:

a control unit configured to, if a report on wireless link interruption between a 1st BS and a 2nd BS is received from the 1st BS, search neighboring BSs of the 1st BS, and select at least one candidate BS that will provide a detour path between the 1st BS and the 2nd BS, from among the neighboring BSs; and

a communication unit configured to transmit information about the at least one candidate BS to the 1st BS.

23. The apparatus of claim 22, wherein the control unit selects the at least one candidate BS on the basis of at least one of a coverage per Radio Frequency (RF) chain of the neighboring BSs, a state per RF chain of the neighboring BSs, a wireless link quality per RF chain of the neighboring BSs, and a distance between each of the neighboring BSs and the 2nd BS.

24. The apparatus of claim 23, wherein the control unit excludes at least one RF chain whose coverage does not include the direction of the 1st BS or the 2nd BS, or which is in an abnormal state, from among RF chains of the neighboring BSs, selects at least one RF chain whose link quality with the 1st BS and the 2nd BS is equal to or is greater than a threshold value, or which belongs to a list of an order of superior link quality, and selects, as the candidate BS, at least one neighboring BS from a list of an order of shortest distance from the 1st BS and the 2nd BS, or which has a distance equal to or less than a threshold value, from among neighboring BSs possessing at least one of the selected at least one RF chain.

25. The apparatus of claim 22, wherein, when selecting a candidate BS for a 3-hop detour path, the control unit selects at least one candidate BS for providing a 2-hop detour path between the neighboring BS of the 1st BS and the 2nd BS.

26. The apparatus of claim 22, wherein the information about the at least one candidate BS comprises at least one of a value capable of identifying a BS and a path corresponding to each candidate BS.

27. The apparatus of claim 22, wherein the control unit manages a management table which registers information of BSs related to fronthaul construction.

28. The apparatus of claim 27, wherein the management table comprises at least one of a value indicating a location of each BS, a value indicating a hardware performance/state of each BS, and a value indicating a wireless link state/quality of each BS with other BSs.