EVOLVED NODE B AND METHOD FOR COHERENT COORDINATED MULTIPOINT TRANSMISSION WITH PER CSI-RS FEEDBACK

• US 20130194943A1
• Filed: 06/18/2012
• Published: 08/01/2013
• Est. Priority Date: 01/27/2012
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Davydov, Alexei, Morozov, Gregory, Maltsev, Alexander, Bolotin, IIya, Sergeyev, Vadim
• Granted Patent: US 8,953,478 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• 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 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0623 Auxiliary parameters, e.g. power control [PCB] or not acknowledged commands [NACK], used as feedback information
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/1469 : using time-sharing
• CPC Class Codes: H04L 65/611 : for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04L 65/65 : Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04W 36/0094 : Definition of hand-off measurement parameters
• CPC Class Codes: H04W 36/04 : Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 4/08 : User group management
• CPC Class Codes: H04W 4/70 : Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 48/16 : Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0216 : using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/044 : based on the type of the allocated resource
• CPC Class Codes: H04W 72/20 : Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/53 : based on regulatory allocation policies
• 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 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

An evolved Node B (eNB) and method for coherent coordinated multipoint transmission with per CSI-RS feedback are generally described herein. The eNB may configure a first cooperating point and a second cooperating point to jointly transmit a multi-node channel-state information (CSI) reference signal (RS) (CSI-RS) in predetermined resource elements of a resource block. The eNB may receive CSI reports as feedback from user equipment (UE). The CSI reports may include a precoding matrix indicator (PMI) indicating relative phase information between the cooperating points based on the multi-node CSI-RS. The CSI reports for the multi-node CSI-RS may be restricted to a PMI of rank-1. The eNB may configure the cooperating points for a coherent joint transmission to the UE based at least on the relative phase information. The coherent joint transmission may also be jointly beamformed based on single-node PMIs.

Claims

1. An evolved Node B (eNB) configured for coherent joint transmission, the eNB to:

configure at least a first cooperating point and a second cooperating point to jointly transmit a multi-node channel-state information (CSI) reference signal (RS) (CSI-RS) in predetermined resource elements of a resource block;

receive CSI reports as feedback from user equipment (UE), the CSI reports including a precoding matrix indicator (PMI) indicating relative phase information between the first and second cooperating points based on the multi-node CSI-RS; and

configure at least the first and second cooperating points for a coherent joint transmission to the UE based at least on the relative phase information.

2. The eNB of claim 1 wherein the multi-node CSI-RS transmitted by each of the cooperating points is based on a same bit sequence,

wherein transmissions of the multi-node CSI-RS by different antenna ports are distinguishable, and

wherein the eNB is configured to indicate to the UE to restrict the CSI reports for the multi-node CSI-RS to a PMI of rank-1.

3. The eNB of claim 2 wherein the first and second cooperating points are associated with different cells having different cell identifiers (IDs), and

wherein the multi-node CSI-RS transmitted by each of the cooperating points is independent of the cell IDs.

4. The eNB of claim 2 wherein the multi-node CSI-RS transmitted by each of the cooperating points is a NTX CSI-RS wherein N corresponds to a number of antenna ports used by the cooperating points to concurrently transmit the multi-node CSI-RS, and

wherein the PMI is an NTX PMI.

5. The eNB of claim 4 wherein the multi-node CSI-RS is transmitted concurrently by a first antenna port of the first cooperating point and a second antenna port of the second cooperating point, and

wherein the UE is configured to distinguish between transmissions of the multi-node CSI-RS on the first and second antenna ports based on an orthogonal complementary code applied to the sequence.

6. The eNB of claim 4 further configured to indicate to the UE to disable channel quality indicator (CQI) and rank indicator (RI) reporting for the multi-node CSI-RS.

7. The eNB of claim 4 wherein the PMI of rank-1 has a constant modulus property with a predetermined structure that includes a quantized phase value from a NTX codebook to indicate the relative phase information.

8. The eNB of claim 4 wherein the eNB is further configured to:

configure the first cooperating point to transmit a first single-node CSI-RS in first resource elements of the resource block;

configure the second cooperating point to transmit a second single-node CSI-RS in second resource elements of the resource block; and

receive additional CSI reports as feedback from the UE, the additional CSI reports including a single-node PMI for each of the single-node CSI-RSs for use in joint beamforming of the coherent joint transmission.

9. The eNB of claim 8 wherein the first single-node CSI-RS, the second single-node CSI-RS, and the multi-node CSI-RS are uniquely coded for each antenna port to allow the UE to distinguish between transmissions from different antenna ports,

wherein the first single-node CSI-RS is a NTX CSI-RS in which N corresponds to a first number of antenna ports used by the first cooperating point to transmit the first single-node CSI-RS, and

wherein the second single-node CSI-RS is a NTX CSI-RS in which N corresponds to a second number of antenna ports used by the second cooperating point to transmit the second single-node CSI-RS.

10. The eNB of claim 4 wherein the CSI reports for the multi-node CSI-RS are configured in accordance with an a-periodic CSI reporting mode indicating no channel-quality indicator (CQI) reporting.

11. A method for coherent joint transmission from two or more transmission points, the method comprising:

configuring at least a first cooperating point and a second cooperating point to jointly transmit a multi-node channel-state information (CSI) reference signal (RS) (CSI-RS) in predetermined resource elements of a resource block;

receiving CSI reports as feedback from user equipment (UE), the CSI reports including a precoding matrix indicator (PMI) indicating relative phase information between the first and second cooperating points based on the multi-node CSI-RS, the CSI reports for the multi-node CSI-RS being restricted to a PMI of rank-1; and

configuring at least the first and second cooperating points for a coherent joint transmission to the UE based at least on the relative phase information.

12. The method of claim 11 further comprising indicating to the UE to restrict the CSI reports for the multi-node CSI-RS to a PMI of rank-1,

wherein the multi-node CSI-RS transmitted by each of the cooperating points is based on a same bit sequence, and

wherein transmissions of the multi-node CSI-RS by different antenna ports are distinguishable.

13. The method of claim 12 wherein the multi-node CSI-RS transmitted by each of the cooperating points is an NTX CSI-RS wherein N corresponds to a number of antenna ports used by the cooperating points to concurrently transmit the multi-node CSI-RS, and

wherein the PMI is an NTX PMI.

14. The method of claim 13 further comprising

configuring the first cooperating point to transmit a first single-node CSI-RS in first resource elements of the resource block;

configuring the second cooperating point to transmit a second single-node CSI-RS in second resource elements of the resource block; and

receiving additional CSI reports as feedback from the UE, the additional CSI reports including a single-node PMI for each of the single-node CSI-RSs for use in joint beamforming of the coherent joint transmission.

15. An evolved Node B (eNB) configured for coherent joint transmission, the eNB to:

configure a first cooperating point and a second cooperating point to jointly transmit a two-transmit antenna (2TX) channel-state information (CSI) reference signal (RS) (2TX CSI-RS) in predetermined resource elements of a resource block;

receive CSI reports as feedback from user equipment (UE), the CSI reports including a 2TX precoding matrix indicator (PMI) based on the 2TX CSI-RS, the 2TX PMI indicating relative phase information between the first and second cooperating points; and

configure the first and second cooperating points for a coherent joint transmission to the UE based at least on the relative phase information.

16. The eNB of claim 15 wherein a bit sequence used to generate the 2TX CSI-RS is generated from a configurable seed,

wherein the eNB is configured to inform the UE of the configurable seed, and

wherein the eNB is further configured to indicate to the UE to restrict the CSI reports for the 2TX CSI-RS to a 2TX PMI of rank-1.

17. The eNB of claim 16 wherein the first and second cooperating points are associated with difference cells having different cell identifiers (IDs), and

wherein the 2TX CSI-RS is generated from the configurable seed to be independent of the cell IDs,

wherein the 2TX CSI-RS is transmitted concurrently by a first antenna port of the first cooperating point and a second antenna port of the second cooperating point, and

wherein the UE is configured to distinguish between transmissions of the 2TX CSI-RS on the first and second antenna ports based on an orthogonal complementary code applied to the bit sequence.

18. An evolved Node B (eNB) configured for coherent joint transmission, the eNB to:

receive channel-state information (CSI) reports as feedback from user equipment (UE), the CSI reports including a precoding matrix indicator (PMI) indicating relative phase information between first and second cooperating points, the relative phase information based on a multi-node CSI reference signal (RS) (CSI-RS) that was jointly transmitted, the CSI reports for the multi-node CSI-RS being restricted to a PMI of rank-1;

receive additional CSI reports as feedback from the UE, the additional CSI reports including a single-node PMI for each of a plurality of single-node CSI-RSs; and

configure at least the first and second cooperating points for a coherent joint transmission to the UE based at least on the relative phase information, the coherent joint transmission being jointly beamformed based on the single-node PMIs.

19. The eNB of claim 18 wherein the multi-node CSI-RS transmitted by each of the cooperating points is based on a same bit sequence that is generated from a configurable seed,

wherein the eNB is configured to inform the UE of the configurable seed, and

wherein a first single-node CSI-RS and a second single-node CSI-RS are based on different bit sequences related to a cell identifier.

20. The eNB of claim 19 wherein the eNB further is to:

configure at least the first cooperating point and the second cooperating point to jointly transmit the multi-node CSI-RS in predetermined resource elements of a resource block for use in measuring relative phase;

configure the first cooperating point to transmit the first single-node CSI-RS in first resource elements of the resource block; and

configure the second cooperating point to transmit the second single-node CSI-RS in second resource elements of the resource block.