Csi reporting for lte-tdd eimta

Patent metadata

Field	Value
Publication number	US-2016205579-A1
Application number	US-201414913889-A
Country	US
Kind code	A1
Filing date	Sep 22, 2014
Priority date	Sep 27, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

Methods, systems, and devices are described for providing periodic CSI reports and/or aperiodic CSI reports to provide CSI for both anchor and non-anchor TDD subframes in eIMTA. Periodic CSI reports may be provided based on a reference configuration, and aperiodic CSI reports may be provided based on a time of reception of a CSI request and a reference configuration. A UE may determine to report anchor or non-anchor CSI through explicit or implicit signaling. Aperiodic CSI may be used for transmission of anchor subframe CSI reports and periodic CSI may be used for transmission of non-anchor subframe CSI reports, or aperiodic CSI may be used for transmission of non-anchor subframe CSI reports and periodic CSI may be used for transmission of anchor subframe CSI reports. A determination of the reference subframe for aperiodic CSI estimation may be based on a time of receipt of an aperiodic CSI request.

First claim

1 . A method of wireless communication performed by a user equipment (UE) in time-division duplex (TDD) communication with a base station, comprising:
receiving a channel state information (CSI) request from the base station; determining that CSI is to be estimated for an anchor reference TDD subframe or a non-anchor reference TDD subframe responsive to receiving the CSI request; estimating an anchor CSI for the anchor reference TDD subframe or a non-anchor CSI for the non-anchor reference TDD subframe; and transmitting at least a portion of the anchor CSI or the non-anchor CSI in an identified uplink subframe, the identified uplink subframe determined based at least in part on a time of receipt of the CSI request.

2 . The method of claim 1 , wherein the identified uplink subframe is further determined based on a reference TDD UL/DL configuration that is different than a current configured TDD UL/DL configuration of the UE.

3 . The method of claim 1 , wherein the transmitting comprises:
transmitting the anchor CSI in a periodic CSI report; and transmitting the non-anchor CSI in an aperiodic CSI report.

4 . The method of claim 1 , wherein the transmitting comprises:
transmitting the non-anchor CSI in a periodic CSI report; and transmitting the anchor CSI in an aperiodic CSI report.

5 . The method of claim 1 , wherein the transmitting comprises:
transmitting both the non-anchor CSI and the anchor CSI in aperiodic CSI reports.

6 . The method of claim 3 , wherein the periodic CSI report is transmitted in a fixed uplink subframe determined by a reference TDD UL/DL configuration.

7 . The method of claim 6 , wherein the reference TDD UL/DL configuration is received via Layer 1 (L1) signaling, Medium Access Control (MAC) signaling, or Radio Resource Control (RRC) signaling.

8 . The method of claim 6 , further comprising:
determining that an uplink subframe for reporting the periodic CSI report and the aperiodic CSI report correspond to the same uplink subframe; and multiplexing the periodic CSI report and the aperiodic CSI report in the same uplink subframe.

9 . The method of claim 6 , further comprising:
determining that an uplink subframe for reporting the periodic CSI report and the aperiodic CSI report correspond to the same uplink subframe; and transmitting the aperiodic CSI report in the same uplink subframe.

10 . The method of claim 3 , wherein the non-anchor reference TDD subframe is determined based on a downlink trigger subframe containing the CSI request and a closest subsequent non-anchor downlink subframe that is at least k subframes after the downlink trigger subframe.

11 . The method of claim 10 , wherein k is greater than or equal to zero.

12 . The method of claim 5 , further comprising receiving signaling from the base station indicating that the anchor CSI or the non-anchor CSI is to be transmitted, the signaling received via one or more of Layer 1 (L1) signaling, Medium Access Control (MAC) signaling, or Radio Resource Control (RRC) signaling.

13 . The method of claim 12 , wherein the signaling comprises an eIMTA CSI type field received via L1 signaling.

14 . The method of claim 12 , wherein the signaling comprises a two-bit CSI request field received in a downlink control information (DCI) transmission.

15 . The method of claim 1 , wherein the anchor CSI or the non-anchor CSI is determined based on a current frame index.

16 . The method of claim 15 , wherein the anchor CSI and the non-anchor CSI are reported in alternating frames.

17 . The method of claim 1 , wherein the identified uplink subframe is determined based on a reference TDD uplink/downlink (UL/DL) configuration.

18 . The method of claim 17 , wherein the identified uplink subframe is determined based on a downlink trigger subframe containing the CSI request and closest subsequent non-anchor uplink subframe that is at least k subframes after the downlink trigger subframe.

19 . The method of claim 18 , wherein k is greater than or equal to zero.

20 . A user equipment (UE) apparatus configured for time-division duplex (TDD) wireless communication with a base station, comprising:
a processor configured to:
receive a channel state information (CSI) request from the base station;
determine that CSI is to be estimated for an anchor reference TDD subframe or a non-anchor reference TDD subframe responsive to receiving the CSI request;
estimate an anchor CSI for the anchor reference TDD subframe or a non-anchor CSI for the non-anchor reference TDD subframe; and
transmit at least a portion of the anchor CSI or the non-anchor CSI in an identified uplink subframe, the identified uplink subframe determined based at least in part on a time of receipt of the CSI request; and
a memory coupled to the processor.

21 . A user equipment (UE) apparatus configured for time-division duplex (TDD) wireless communication with a base station, comprising:
means for receiving a channel state information (CSI) request from the base station; means for determining that CSI is to be estimated for an anchor reference TDD subframe or a non-anchor reference TDD subframe responsive to receiving the CSI request; means for estimating an anchor CSI for the anchor reference TDD subframe or a non-anchor CSI for the non-anchor reference TDD subframe; and means for transmitting at least a portion of the anchor CSI or the non-anchor CSI in an identified uplink subframe, the uplink subframe determined based at least in part on a time of receipt of the CSI request.

22 . The apparatus of claim 21 , wherein the identified uplink subframe is further determined based on a reference TDD UL/DL configuration that is different from a current configured TDD UL/DL configuration of the UE apparatus.

23 . The apparatus of claim 21 , wherein the means for transmitting transmits the anchor CSI in a periodic CSI report, and transmits the non-anchor CSI in an aperiodic CSI report.

24 . The apparatus of claim 21 , wherein the means for transmitting transmits the non-anchor CSI in a periodic CSI report, and transmits the anchor CSI in an aperiodic CSI report.

25 . The apparatus of claim 21 , wherein the means for transmitting transmits both the non-anchor CSI and the anchor CSI in a periodic CSI reports.

26 . The apparatus of claim 23 , wherein the periodic CSI report is transmitted in a fixed uplink subframe determined by a reference TDD UL/DL configuration.

27 . The apparatus of claim 26 , further comprising:
means for determining that an uplink subframe for reporting the periodic CSI report and a periodic CSI report correspond to the same uplink subframe; and means for multiplexing the periodic CSI report and the aperiodic CSI report in the same uplink subframe.

28 . The apparatus of claim 23 , wherein the non-anchor reference TDD subframe is determined based on a downlink trigger subframe containing the CSI request and a closest subsequent non-anchor downlink subframe following the downlink trigger subframe.

29 . The apparatus of claim 21 , wherein the anchor CSI or the non-anchor CSI is determined based on a current frame index.

30 . A computer program product for time division duplex (TDD) wireless communication by a user equipment (UE), comprising:
a non-transitory computer-readable medium comprising code for:
receiving a

Assignees

• Cheng Peng
• Wang Neng
• Wei Chao
• Hou Jilei
• Qualcomm Inc

Inventors

• Cheng Peng
• Wang Neng
• Wei Chao
• Chen Wanshi
• Gaal Peter
• Xu Hao
• Hou Jilei

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L1/0026

  Transmission of channel quality indication · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title