METHOD AND APPARATUS FOR PROVIDING CHANNEL STATE INFORMATION-REFERENCE SIGNAL (CSI-RS) CONFIGURATION INFORMATION IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS

• US 20150155992A1
• Filed: 02/13/2015
• Published: 06/04/2015
• Est. Priority Date: 03/17/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Kijun, KIM, Hyungtae, SEO, Hanbyul, LEE, Daewon
• Granted Patent: US 9,236,990 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04J 11/0036 at the receiver
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method for transmitting a Channel State Information-Reference Signal (CSI-RS) from a base station supporting multiple transmit antennas to a mobile station. The method according to one embodiment includes transmitting, at the base station, information of one or more CSI-RS configurations to the mobile station; and transmitting, at the base station, at least one downlink subframe mapped with the CSI-RSs to the mobile station. The one or more CSI-RS configurations include i) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS, ii) at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS, or iii) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS and at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS.

Claims

1. A method for transmitting a Channel State Information-Reference Signal (CSI-RS) from a base station supporting multiple transmit antennas to a mobile station, the method comprising:

transmitting, at the base station, information of one or more CSI-RS configurations to the mobile station mapping, at the base station, CSI-RSs to resource elements of at least one downlink subframe based on the one or more CSI-RS configurations; and

transmitting, at the base station, the at least one downlink subframe mapped with the CSI-RSs to the mobile station,

wherein the one or more CSI-RS configurations include;

i) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS,

ii) at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS, or

iii) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS and at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS.

2. The method according to claim 1, wherein the one or more CSI-RS configurations indicate positions of the resource elements mapped with the CSI-RSs.

3. The method according to claim 1, wherein the at least one downlink subframe mapped with the CSI-RSs is configured by at least one CSI-RS subframe configuration, each of the at least one CSI-RS subframe configuration indicating a predetermined period and a predetermined offset.

4. The method according to claim 3, wherein the at least one CSI-RS subframe configuration is configured separately for CSI-RSs for which the mobile station assumes non-zero and zero transmission power.

5. The method according to claim 1, wherein the CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS corresponds to positions of resource elements where CSI-RSs of neighbor base station are transmitted.

6. The method according to claim 1, wherein the CSI-RSs are transmitted for one, two, four or eight antenna ports.

7. The method according to claim 1, further comprising:

transmitting, at the base station through dedicated Radio Resource Control (RRC) signaling, an indication of a CSI-RS configuration used for CSI feedback by the mobile station among the one or more CSI-RS configurations.

8. The method according to claim 1, wherein the CSI-RSs of the at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS are used for a channel quality measurement of CSI feedback.

9. The method according to claim 1, wherein the CSI-RSs of the at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS are used for an interference measurement of CSI feedback.

10. A method for transmitting Channel State Information (CSI) at a mobile station using a Channel State Information-Reference Signal (CSI-RS) from a base station supporting multiple transmit antennas, the method comprising:

receiving, at the mobile station, information of one or more CSI-RS configurations from the base station;

receiving, at the mobile station, at least one downlink subframe of which resource elements are mapped with CSI-RSs based on the one or more CSI-RS configurations from the base station; and

transmitting, at the mobile station, the CSI measured by using the CSI-RSs to the base station,

wherein the one or more CSI-RS configurations include;

i) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS,

ii) at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS, or

iii) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS and at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS.

11. A base station for transmitting a Channel State Information-Reference Signal (CSI-RS) for multiple antennas transmission, the base station comprising:

a receiving module configured to receive an uplink signal from a mobile station;

a transmitting module configured to transmit a downlink signal to the mobile station; and

a processor configured to;

control the base station including the receiving module and the transmitting module,

transmit, via the transmitting module, information of one or more CSI-RS configurations to the mobile station,

map CSI-RSs to resource elements of at least one downlink subframe based on the one or more CSI-RS configurations, and

transmit, via the transmitting module, the at least one downlink subframe mapped with the CSI-RSs to the mobile station,

wherein the one or more CSI-RS configurations include;

i) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS,

ii) at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS, or

iii) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS and at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS.

12. A mobile station for transmitting Channel State Information (CSI) using a Channel State Information-Reference Signal (CSI-RS) from a base station supporting multiple transmit antennas, the mobile station comprising:

a receiving module configured to receive a downlink signal from the base station;

a transmitting module configured to transmit an uplink signal to the base station; and

a processor configured to;

control the mobile station including the receiving module and the transmitting module,

receive, via the receiving module, information of one or more CSI-RS configurations from the base station,

receive, via the receiving module, at least one downlink subframe of which resource elements are mapped with CSI-RSs based on the one or more CSI-RS configurations from the base station, and

transmit, via the transmitting module, the CSI measured by using the CSI-RSs to the base station,

wherein the one or more CSI-RS configurations include;

i) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS,

ii) at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS, or

iii) at least one CSI-RS configuration for which the mobile station assumes non-zero transmission power for the CSI-RS and at least one CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS.