System and method for network uplink measurement based operation using UE centric sounding

Patent metadata

Field	Value
Publication number	US-9973243-B2
Application number	US-201615274660-A
Country	US
Kind code	B2
Filing date	Sep 23, 2016
Priority date	Jun 28, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

Embodiments are provided for uplink measurement based mechanism and control using user equipment (UE) centric sounding signals. The mechanism provides an alternative to DL-measurement dominated system control. Based on UL-measurements at TPs, the network obtains knowledge of users' channel and timing information, traffic, and interference, and is thus able to perform better control, including TP and UE clustering and optimization, and power control and link adaptation. In an embodiment method, a TP receives one-to-one mapping information indicating a plurality of UE IDs and a plurality of sounding channels assigned to the corresponding UE IDs. When the TP detects a sounding reference signal (SRS) from a UE, the TP is able to identify the UE using the detected SRS and the one-to-one mapping information. The TP then obtains measurement information for the identified UE, enabling better control and communications for uplink and downlink transmissions between multiple TPs and the UE.

First claim

What is claimed is:

1. A method for clustering, comprising:
receiving, by a central controller, two or more uplink sounding reference signal (SRS) measurements associated with a user equipment (UE) from two or more neighboring transmit points (TPs), the two or more uplink SRS measurements including at least a first uplink SRS measurement of a uplink SRS of the UE and a second uplink SRS measurement of the uplink SRS of the UE, the first uplink SRS measurement being taken by a different neighboring TP than the second uplink SRS measurement, the uplink SRS of the UE being generated using a UE identity of the UE and being decoupled from the two or more neighboring TPs; and
determining, by the central controller, a scheme for communications between one or more TPs with the UE based on the two or more uplink SRS measurements.

2. The method of claim 1 , further comprising:
establishing, by the central controller, a group of TPs that serves as a virtual TP or virtual radio access network (VRAN) for the UE, wherein each individual TP in the group of TPs is transparent to the UE.

3. The method of claim 1 , wherein the determining, by the central controller, a scheme further comprising:
determining, by the central controller, the one or more TPs to serve the UE based on at least one of: a TP clustering, TP clustering update, TP clustering optimization, transmission power control, or link adaptation.

4. The method of claim 3 , wherein the TP clustering includes uplink TP clustering for uplink signals from the UE and downlink TP clustering for downlink signals to the UE, and wherein the uplink TP clustering and the downlink TP clustering are established separately and independent from one another.

5. The method of claim 3 , wherein the TP clustering includes uplink coordinated multi-point (CoMP) configuration using timing advance value from the UE.

6. The method of claim 1 , wherein the uplink SRS is used to uniquely identify the UE by TPs in a network area.

7. A central controller comprising:
a processor; and
a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
receive two or more uplink sounding reference signal (SRS) measurements associated with a user equipment (UE) from two or more neighboring transmit points (TPs), the two or more uplink SRS measurements including at least a first uplink SRS measurement of a uplink SRS of the UE and a second uplink SRS measurement of the uplink SRS of the UE, the first uplink SRS measurement being taken by a different neighboring TP than the second uplink SRS measurement, the uplink SRS of the UE being generated using a UE identity of the UE and being decoupled from the two or more neighboring TPs; and
determine a scheme for communications between one or more TPs with the UE based on the two or more uplink SRS measurements.

8. The central controller of claim 7 , further comprising:
establishing, by the central controller, a group of TPs that serves as a virtual TP or virtual radio access network (VRAN) for the UE, wherein each individual TP in the group of TPs is transparent to the UE.

9. The central controller of claim 7 , wherein the instructions to determine the scheme further include instructions to:
determine the one or more TPs to serve the UE based on at least one of: a TP clustering, TP clustering update, TP clustering optimization, transmission power control, or link adaptation.

10. The central controller of claim 9 , wherein the TP clustering includes uplink TP clustering for uplink signals from the UE and downlink TP clustering for downlink signals to the UE, and wherein the uplink TP clustering and the downlink TP clustering are established separately and independent from one another.

11. The central controller of claim 9 , wherein the TP clustering includes uplink coordinated multi-point (CoMP) configuration using timing advance value from the UE.

12. The central controller of claim 9 , wherein the uplink SRS is used to uniquely identify the UE by TPs in a network area.

13. A method comprising:
receiving, by a first neighboring transmit point (TP), an uplink sounding reference signal (SRS) from a user equipment (UE);
sending, by the first neighboring TP, a first uplink SRS measurement of the uplink SRS to a central controller; and
serving, by the first neighboring TP, the UE based on a scheme for communications between one or more TPs with the UE, the scheme being based on at least the first uplink SRS measurement of the uplink SRS and a second uplink SRS measurement of the uplink SRS, the second uplink SRS measurement being taken by a second neighboring TP that is different than the first neighboring TP, and the uplink SRS of the UE being generated using a UE identity of the UE and being decoupled from the first neighboring TP and the second neighboring TP.

14. The method of claim 13 , wherein the scheme is used to indicate at least one of:
a TP clustering, TP clustering update, TP clustering optimization, transmission power control, or link adaptation.

15. The method of claim 14 , wherein the TP clustering includes uplink TP clustering for uplink signals from the UE and downlink TP clustering for downlink signals to the UE, and wherein the uplink TP clustering and the downlink TP clustering are established separately and independent from one another.

16. The method of claim 13 , the TP clustering includes uplink coordinated multi-point (CoMP) configuration using timing advance value from the UE.

17. The method of claim 13 , further comprising:
measuring a strength of the SRS; and
according to the measured strength of the SRS, classifying the UE in an active UE set of neighborhood UEs, a candidate UE set of UEs with relatively weak signals, or an undetectable UE set of UEs with undetectable SRS.

18. A first neighboring transmit point (TP) comprising:
a processor; and
a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions for:
receiving an uplink sounding reference signal (SRS) from a user equipment (UE);
sending a first uplink SRS measurement of the uplink SRS to a central controller; and
serving the UE based on a scheme for communications between one or more TPs with the UE, the scheme being based on at least the first uplink SRS measurement of the uplink SRS and a second uplink SRS measurement of the uplink SRS, the second uplink SRS measurement being taken by a second neighboring TP that is different than the first neighboring TP, and the uplink SRS of the UE being generated using a UE identity of the UE and being decoupled from the first neighboring TP and the second neighboring TP.

19. The first neighboring TP of claim 18 , wherein the scheme is used to indicate at least one of: a TP clustering, TP clustering update, TP clustering optimization, transmission power control, or link adaptation.

20. The first neighboring TP of claim 19 , wherein the TP clustering includes uplink TP clustering for uplink signals from the UE and downlink TP clustering for downlink signals to the UE, and wherein the uplink TP clustering and the downlink TP clustering are established separately and independent from one another.

21. The first neighboring TP of claim 18 , wherein the programming further includes instructions for:
measuring a strength of the SRS; and
according to the measured strength of the SRS, classifying the UE in an active UE set of neighborhood UEs, a cand

Assignees

• Huawei Tech Co Ltd

Inventors

• Zhang Liqing
• Ma Jianglei
• Au Kelvin Kar Kin
• Senarath Nimal Gamini

Classifications

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04L5/0064

  Rate requirement of the data, e.g. scalable bandwidth, data priority · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04B7/0686

  Hybrid systems, i.e. switching and simultaneous transmission · CPC title

• H04B7/024 Primary

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title