Methods and Systems for User Equipment Positioning Using Intercell Interference Coordination

• US 20120099503A1
• Filed: 05/26/2010
• Published: 04/26/2012
• Est. Priority Date: 05/26/2010
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Guo, Ning, Boudreau, Gary
• Granted Patent: US 8,755,355 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: G01S 5/0244 Accuracy or reliability of position solution or of measurements contributing thereto
• CPC Class Codes: H04B 17/27 for locating or positioning the transmitter
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 92/20 between access points

Abstract

Methods, devices and systems for determining positions of user equipments (UEs) based on uplink position signals are described. Cooperating base stations measure received positioning signals and report measurements to serving base stations. Cooperating base stations can also adapt resource allocation to mitigate interference on the uplink to positioning signals. Cooperation between base stations can be coordinated via inter-base station links, e.g., X2 interfaces in LTE systems.

Claims

1. A method for collecting data associated with determining a position of user equipment, UE, (604) comprising:

transmitting (1200), by a serving eNodeB, eNB, (600) positioning scheduling information to said UE (604), wherein said positioning scheduling information is usable by said UE (604) to transmit at least one positioning signal;

transmitting (1202), by said serving eNB (600), said positioning scheduling information to a first set of cooperating eNBs (602), wherein said positioning scheduling information is usable by said first set of cooperating eNBs (602) to identify said at least one positioning signal and to mitigate interference associated with said at least one positioning signal;

receiving (1204), by said serving eNB (600), said at least one positioning signal; and

receiving (1206), by said serving eNB (600), information associated with reception of said at least one positioning signal by said first set of cooperating eNBs (602).

2. The method of claim 1, further comprising:

determining said position of said UE using said at least one positioning signal and said information received by said serving eNB.

3. The method of claim 1, wherein said positioning scheduling information includes an assigned transmit time interval (TTI) and assigned resource blocks (RBs) associated with said at least one positioning signal.

4. The method of claim 1, wherein said positioning scheduling information includes at least one of demodulation reference signal (DMRS) information and sounding reference signal (SRS) information.

5. The method of claim 1, wherein said positioning scheduling includes an intercell interference command (ICIC) which instructs said first set of eNBs to mitigate said interference associated with said at least one positioning signal.

6. The method of claim 1, wherein said step of transmitting, by said serving eNB, said positioning scheduling information to said first set of cooperating eNBs further comprises:

transmitting said positioning scheduling information over an X2 interface.

7. The method of claim 1, further comprising the step of:

transmitting, by said serving eNB, said positioning scheduling information to a second set of cooperating eNBs different from said first set of cooperating eNBs, wherein said positioning scheduling information is usable by said second set of cooperating eNBs to identify said at least one positioning signal and to mitigate interference associated with said at least one positioning signal.

8. The method of claim 7, wherein said step of transmitting, by said serving eNB, said positioning scheduling information to said second set of cooperating eNBs different from said first set of cooperating eNBs, occurs only after failure to detect said position of said UE using said information received from said first set of eNBs.

9. The method of claim 1, further comprising:

adaptively controlling, by said serving eNB, a transmit power of said UE.

10. The method of claim 1, wherein said information associated with reception of said at least one positioning signal by said first set of cooperating eNBs includes at least one of a measured time-of-arrival (TOA) of said at least one positioning signal and a signal quality of said at least one positioning signal.

11. A communication node (600, 400) comprising:

a wireless transceiver (1402) configured to transmit and receive signals over an air interface toward and from user equipment, UE, (604) respectively;

a processor (1404), connected to said wireless transceiver (1402), and configured to control said wireless transceiver (1402) to transmit positioning scheduling information to said UE (604), wherein said positioning scheduling information is usable by said UE (604) to transmit at least one positioning signal;

an interface (1406), connected to said processor (1404), configured to transmit said positioning scheduling information to a first set of cooperating eNBs (602), wherein said positioning scheduling information is usable by said first set of cooperating eNBs (602) to identify said at least one positioning signal and to mitigate interference associated with said at least one positioning signal;

wherein said wireless transceiver (1402) is further configured to receive said at least one positioning signal; and

wherein said interface (1406) is further configured to receive information associated with reception of said at least one positioning signal by said first set of cooperating eNBs (602).

12. The communication node of claim 11, wherein said positioning scheduling information includes an assigned transmit time interval (TTI) and assigned resource blocks (RBs) associated with said at least one positioning signal.

13. The communication node of claim 11, wherein said positioning scheduling information includes at least one of demodulation reference signal (DMRS) information and sounding reference signal (SRS) information.

14. The communication node of claim 11, wherein said positioning scheduling includes an intercell interference command (ICIC) which instructs said first set of eNBs to mitigate said interference associated with said at least one positioning signal.

15. The communication node of claim 11, wherein said interface is an X2 interface.

16. The communication node of claim 11, wherein said interface is further configured to transmit said positioning scheduling information to a second set of cooperating eNBs different from said first set of cooperating eNBs, wherein said positioning scheduling information is usable by said second set of cooperating eNBs to identify said at least one positioning signal and to mitigate interference associated with said at least one positioning signal.

17. The communication node of claim 16, wherein said interface is configured to transmit said positioning scheduling information to said second set of cooperating eNBs only after failure to detect said position of said UE using said information received from said first set of eNBs.

18. The communication node of claim 11, wherein said processor is further configured to control said wireless transceiver to transmit commands to said UE to adaptively control the transmit power of said UE.

19. The communication node of claim 11, wherein said information associated with reception of said at least one positioning signal by said first set of cooperating eNBs includes at least one of a measured time-of-arrival (TOA) of said at least one positioning signal and a signal quality of said at least one positioning signal.

20. The communication node of claim 11, wherein said processor is further configured to determine a position of said UE based upon said information received by said serving eNodeB.

21. A method for assisting in a determination of a position of user equipment, UE, (604) comprising:

receiving (1300), by a cooperating eNodeB, eNB, (602), information associated with at least one positioning signal to be transmitted by said UE (604) which is communicating with a serving eNB (600);

receiving (1302), by said cooperating eNB (602), a command to mitigate interference associated with said at least one positioning signal;

adapting (1304), by said cooperating eNB (602), communication resources used by another UE which is communicating with said cooperating eNB (602) to mitigate said interference;

receiving (1306), by said cooperating eNB (602) said at least one positioning signal; and

transmitting (1308), by said cooperating eNB (602), positioning information associated with reception of said at least one positioning signal toward said serving eNB (600).

22. The method of claim 21, wherein said step of adapting further comprises:

reassigning said another UE to at least one of another transmit time interval and another set of resource blocks based upon said information associated with said at least one positioning signal.

23. The method of claim 21, wherein said positioning scheduling information includes an assigned transmit time interval (TTI) and assigned resource blocks (RBs) associated with said at least one positioning signal.

24. The method of claim 21, wherein said positioning scheduling information includes at least one of demodulation reference signal (DMRS) information and sounding reference signal (SRS) information.

25. The method of claim 21, wherein said command is an intercell interference command (ICIC) received over an X2 interface.

26. A communication node (602, 1400) comprising:

an interface (1406) configured to receive information associated with at least one positioning signal to be transmitted by a user equipment, UE, (604) which is communicating with a serving eNB (600), and further configured to receive a command to mitigate interference associated with said at least one positioning signal;

a processor (1404), connected to said interface (1406), configured to adapt communication resources used by another UE which is communicating with said cooperating eNB (602) to mitigate said interference in response to receipt of said command; and

a wireless transceiver (1402), connected to said processor (1404), configured to transmit and receive signals over an air interface toward and from user equipment, respectively, including being configured to receive said at least one positioning signal,

wherein said processor (1404) is further adapted to transmit positioning information associated with reception of said at least one positioning signal toward said serving eNB (600) via said interface (1406).

27. The communication node of claim 26, wherein said processor is further configured to adapt said communication resources by reassigning said another UE to at least one of another transmit time interval and another set of resource blocks based upon said information associated with said at least one positioning signal.

28. The communication node of claim 26, wherein said positioning scheduling information includes an assigned transmit time interval (TTI) and assigned resource blocks (RBs) associated with said at least one positioning signal.

29. The communication node of claim 26, wherein said positioning scheduling information includes at least one of demodulation reference signal (DMRS) information and sounding reference signal (SRS) information.

30. The communication node of claim 26, wherein said command is an intercell interference command (ICIC) and said interface is an X2 interface.