METHOD AND APPARATUS FOR CONFIGURATON, MEASUREMENT AND REPORTING OF CHANNEL STATE INFORMATION FOR LTE TDD WITH DYNAMIC UL/DL CONFIGURATION

• US 20150124663A1
• Filed: 10/31/2014
• Published: 05/07/2015
• Est. Priority Date: 11/04/2013
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: CHEN, RUNHUA, EKPENYONG, ANTHONY EDET
• Granted Patent: US 9,819,471 B2
• Time in Patent Office: Days
• US Class Current: 370/278
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0023 characterised by the signalling
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 28/0231 based on communication conditions dynamic wireless traffic scheduling definition based on channel quality criteria H04W72/54
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 76/00 Connection management

Abstract

A method of operating a time division duplex (TDD) wireless communication system is disclosed. The method includes establishing communications with a remote transceiver. A subframe configuration including static and flexible subframes is determined and transmitted to the remote transceiver. A channel state information (CSI) report is received from the remote transceiver in response to the subframe configuration.

Claims

1. A method of operating a time division duplex (TDD) communication system, comprising the steps of:

establishing communications with a remote transceiver;

determining a subframe configuration including static and flexible subframes;

transmitting the subframe configuration to the remote transceiver in response to the step of determining; and

receiving a channel state information (CSI) report from the remote transceiver in response to the step of transmitting.

2. The method of claim 1, comprising:

signaling the static subframe by Radio Resource Control (RRC); and

signaling the flexible subframe by a downlink control information (DCI) packet.

3. The method of claim 1, comprising transmitting a plurality of bits in an uplink grant to indicate which subframe is used for the CSI report.

4. The method of claim 1, comprising transmitting a plurality of bits in an uplink grant to indicate whether the CSI report is determined from the static subframe, the flexible subframe, or both subframes.

5. The method of claim 4, comprising transmitting a CSI request in the uplink grant to the remote transceiver in a valid downlink subframe at least n_threshold subframes prior to an uplink subframe specified by the uplink grant.

6. The method of claim 1, wherein the CSI report is determined in response to a channel state information reference signal (CSI-RS) resource and at least two channel state information interference measurement (CSI-IM) resources.

7. The method of claim 6, wherein a first CSI-IM resource determines static subframe interference, and wherein a second CSI-IM resource determines flexible subframe interference.

8. The method of claim 1, comprising receiving periodic CSI reports from the remote transceiver.

9. The method of claim 1, comprising receiving the CSI report as selected by the remote transceiver in order of decreasing priority according to CSI subframe set priority, CSI type, a serving cell index, and a CSI process index.

10. The method of claim 1, comprising receiving the CSI report as selected by the remote transceiver in order of decreasing priority according to CSI type, CSI process index, a serving cell index, and a CSI subframe set priority.

11. The method of claim 1, wherein the step of determining is in response to Radio Resource Control (RRC) signaling.

12. A method of operating a time division duplex (TDD) communication system, comprising the steps of:

establishing communications with a remote transceiver;

receiving a subframe configuration including static and flexible subframes;

creating a channel state information (CSI) report in response to the subframe configuration; and

transmitting the CSI report to the remote transceiver.

13. The method of claim 12, wherein the static subframe is signaled by Radio Resource Control (RRC), and wherein, the flexible subframe is signaled by a downlink control information (DCI) packet.

14. The method of claim 12, comprising receiving a plurality of bits in an uplink grant to indicate which subframe is used for the CSI report.

15. The method of claim 12, comprising receiving a plurality of bits in an uplink grant to indicate whether the CSI report is determined from the static subframe, the flexible subframe, or both subframes.

16. The method of claim 12, wherein an uplink grant from the remote transceiver comprises a channel state information reference signal (CSI-RS) resource and at least two channel state information interference measurement (CSI-IM) resources.

17. The method of claim 16, wherein a first CSI-IM signal determines static subframe interference, and wherein a second CSI-IM signal determines flexible subframe interference.

18. The method of claim 12, comprising:

creating a channel state information (CSI) report for one of the static and flexible subframes; and

selecting the CSI report according to at least one of a CSI subframe set priority, a CST type, a serving cell index, and a CSI process index.

19. A time division duplex base station, comprising:

a processor; and

a transceiver coupled to the processor and arranged to transmit a subframe configuration including static and flexible subframes to a remote transceiver, the transceiver further arranged to transmit an uplink grant to the remote transceiver, and to receive a channel state information (CSI) report from the remote transceiver in response to the uplink grant.

20. The time division duplex base station of claim 19, wherein the static subframe is signaled by Radio Resource Control (RRC), and wherein the flexible subframe is signaled by a downlink control information (DCI) packet.