Sounding reference signal for coordinated multi-point operation

Patent metadata

Field	Value
Publication number	US-8938247-B2
Application number	US-76489110-A
Country	US
Kind code	B2
Filing date	Apr 21, 2010
Priority date	Apr 23, 2009
Publication date	Jan 20, 2015
Grant date	Jan 20, 2015

Abstract

Systems and methodologies are described that facilitate configuring a sounding reference signal transmission in a wireless communication environment. A UE can employ coordinated multi-point transmission and/or reception such that multiple cells collaborate to transmit data to the UE and/or receive data from the UE. To support the coordinated multi-point transmission and/or reception, the UE can transmit a sounding reference signal that is configured to enable reliable reception of the sounding reference signal by members of a cooperating set. In addition, configuration of the sounding reference signal can be coordinated to enable more efficient transmission and utilization of the sounding reference signal. Configuration of the sounding reference signal can be based upon information exchanged between the multiple cells. Moreover, the multiple cells can coordinate to set and control a transmit power of the sounding reference signal.

First claim

What is claimed is:

1. A method, comprising:
receiving, at a mobile device, first configuration information from a first node in a coordinated multi-point (CoMP) set, wherein the CoMP set includes a plurality of nodes that collaborate to provide coordinated reception or transmission of data between the plurality of nodes and the mobile device, and wherein the first configuration information comprises a CoMP offset that boosts a transmit power for a sounding reference signal (SRS) when the SRS is transmitted for reception by the plurality of nodes in the CoMP set relative to a transmit power of the SRS when the SRS is transmitted in a single-node configuration;
determining, by the mobile device, the transmit power for the SRS based at least in part on a physical uplink shared channel transmit power and the CoMP offset; and
transmitting the SRS to at least one node in the plurality of nodes.

2. The method of claim 1 , wherein the first configuration information includes a set of parameters related to SRS transmission, wherein the set of parameters includes at least one of a bandwidth parameter, a periodicity parameter, a subframe offset, a hopping bandwidth parameter, a transmission comb parameter, a starting physical resource block assignment, a transmission duration parameter, a cyclic shift parameter, or a transmit power offset.

3. The method of claim 2 , wherein transmitting the SRS is based upon at least one of the bandwidth parameter or the cyclic shift parameter.

4. The method of claim 2 , further comprising mapping the SRS to a set of resource elements in a subframe, wherein the set of resource elements is determined in accordance with at least one of the bandwidth parameter, the hopping bandwidth parameter, the subframe offset, the transmission comb parameter, or the starting physical resource block assignment.

5. The method of claim 1 , further comprising receiving, at the mobile device, second configuration information from a second node in the CoMP set, wherein the second node is associated with a non-serving cell and the first node is associated with a serving cell.

6. The method of claim 5 , further comprising:
combining the first configuration information and the second configuration information; and
generating the SRS based upon the first configuration information and the second configuration information.

7. The method of claim 1 , wherein the CoMP offset is configured based upon various parameters associated with nodes in the CoMP set.

8. The method of claim 1 , further comprising:
receiving a power control command from at least one node in the CoMP set; and
incrementally adjusting the transmit power for the SRS in accordance with the power control command.

9. The method of claim 1 , wherein transmitting the SRS further comprises:
partitioning a system bandwidth into a plurality of chunks;
selecting a first portion of a first chunk for a first transmission of the SRS; and
hopping to a second portion of the first chunk for a second transmission of the SRS.

10. The method of claim 9 , further comprising hopping to a second chunk in the plurality of chunks after a predetermined number of hops within the first chunk, wherein a subsequent transmission of the SRS utilizes at least a portion of the second chunk.

11. A wireless communications apparatus, comprising:
at least one processor configured to:
receive, at a mobile device, first configuration information from a node in coordinated multi-point (CoMP) set, wherein the CoMP set includes a plurality of nodes that collaborate to provide coordinated reception or transmission of data between the plurality of nodes and the mobile device, and wherein the first configuration information comprises a CoMP offset that boosts a transmit power for a sounding reference signal (SRS) when the SRS is transmitted for reception by the plurality of nodes in the CoMP set relative to a transmit power of the SRS when the SRS is transmitted in a single-node configuration;
determine, by the mobile device, the transmit power for the SRS based at least in part on a physical uplink shared channel transmit power and the CoMP offset; and
transmit the SRS to at least one node in the plurality of nodes.

12. The wireless communications apparatus of claim 11 , wherein the at least one processor is further configured to:
receive, at the mobile device, second configuration information from a second node of the CoMP set; and
combine the second configuration information with the first configuration information; and
generate the SRS based upon the second configuration information and the first configuration information.

13. The wireless communications apparatus of claim 11 , wherein the at least one processor is further configured to:
receive power control commands from at least one node in the CoMP set; and
adjust the transmit power for the SRS in accordance with the power control commands.

14. The wireless communications apparatus of claim 11 , wherein the at least one processor is further configured to:
partition a system bandwidth into a plurality of chunks;
select a first portion of a first chunk;
utilize the first portion of the first chunk to transmit the SRS; and
selecting a second portion of the first chunk for a second transmission of the SRS.

15. The wireless communications apparatus of claim 14 , wherein the at least one processor is further configured to hop to a second chunk in the plurality of chunks.

16. An apparatus, comprising:
means for receiving, at a mobile device, first configuration information from a first node in a coordinated multi-point (CoMP) set, wherein the CoMP set includes a plurality of nodes that collaborate to provide coordinated reception or transmission of data between the plurality of nodes and the mobile device, and wherein the first configuration information comprises a CoMP offset that boosts a transmit power for a sounding reference signal (SRS) when the SRS is transmitted for reception by the plurality of nodes in the CoMP set relative to a transmit power of the SRS when the SRS is transmitted in a single-node configuration;
means for determining, by the mobile device, the transmit power for the SRS based at least in part on a physical uplink shared channel transmit power and the CoMP offset; and
means for transmitting the SRS to at least one node in the plurality of nodes.

17. The apparatus of claim 16 , wherein the first configuration information includes a set of parameters related to a SRS transmission, wherein the set of parameters includes at least one of a bandwidth parameter, a periodicity parameter, a subframe offset, a hopping bandwidth parameter, a transmission comb parameter, a starting physical resource block assignment, a transmission duration parameter, a cyclic shift parameter, or a transmit power offset.

18. The apparatus of claim 16 , further comprising means for receiving second configuration information from a second node in the CoMP set, wherein the second node is associated with a non-serving cell and the first node is associated with a serving cell.

19. The apparatus of claim 18 , further comprising:
means for integrating the first configuration information and the second configuration information; and
means for generating the SRS based upon the first configuration information and the second configuration information.

20. The apparatus of claim 16 , further comprising:
means for receiving a power control command from at least one node in the CoMP set; and
means for adjusting the transmit

Assignees

• Gorokhov Alexei Y
• Montojo Juan
• Chen Wanshi
• Qualcomm Inc

Inventors

• Gorokhov Alexei Y
• Montojo Juan
• Chen Wanshi

Classifications

• H04W52/325

  Power control of control or pilot channels · CPC title

• H04B7/024

  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

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W52/40

  during macro-diversity or soft handoff · CPC title

• H04L5/0091

  Signalling for the administration of the divided path, e.g. signalling of configuration information · CPC title