PDSCH transmission schemes with compact downlink control information (DCI) format in new carrier type (NCT) in LTE

Patent metadata

Field	Value
Publication number	US-9420576-B2
Application number	US-201414257872-A
Country	US
Kind code	B2
Filing date	Apr 21, 2014
Priority date	Apr 23, 2013
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

Certain aspects of the present disclosure relate to physical downlink shared channel (PDSCH) transmission schemes with compact downlink control information (DCI) format in new carrier type (NCT) in long term evolution (LTE).

First claim

What is claimed is:

1. A method for wireless communications by a base station, comprising:
generating Downlink Control Information (DCI) for scheduling a physical downlink shared channel (PDSCH) to at least one user equipment (UE) according to a first DCI format, where the first DCI format schedules one PDSCH codeword;
providing an indication to the UE of one or more parameters for a type of beamforming on which the scheduled PDSCH is based, wherein the indication comprises an indication of whether the PDSCH is based on open loop beamforming (OLBF) or closed loop beamforming (CLBF); and
transmitting the DCI to the UE in a downlink control channel.

2. The method of claim 1 , wherein the PDSCH is scheduled for transmission on a new carrier type (NCT) different than a legacy carrier type (LCT), wherein the UE is a UE type capable of communicating on the NCT while other UE types are not capable of communicating on the NCT.

3. The method of claim 1 , wherein the downlink control channel comprises an enhanced physical downlink control channel (EPDCCH).

4. The method of claim 1 , wherein the indication comprises an indication of at least one of: how many or which antenna ports are used for the beamforming.

5. The method of claim 1 , wherein:
the PDSCH is based on OLBF; and
a beam cycling resource granularity for the OLBF is based, at least in part, on resources assigned to the PDSCH.

6. The method of claim 1 , wherein:
the PDSCH is based on OLBF; and
a beam cycling resource granularity for the OLBF is based, at least in part, on a type of search space of a control channel in which the DCI is transmitted.

7. The method of claim 1 , wherein:
the PDSCH is based on OLBF; and
a beam cycling resource granularity for the OLBF, under certain conditions, is less than a physical resource block (PRB) pair.

8. The method of claim 1 , wherein an indication of at least one beamforming parameter is signaled semi-statically or dynamically.

9. The method of claim 1 , wherein the scheduled PDSCH comprises a multi-user multiple-input multiple-output (MU-MIMO) PDSCH.

10. The method of claim 1 , wherein the indication is provided via at least one of a transmission port or transmission mode of the downlink control channel in which the DCI is transmitted.

11. The method of claim 1 , wherein a size of the first DCI format is dependent, at least in part, on a type of search space in which the downlink control channel is transmitted.

12. A method for wireless communications by a user equipment (UE), comprising:
receiving a downlink control channel with Downlink Control Information (DCI) of a first DCI format for scheduling a physical downlink shared channel (PDSCH);
determining one or more parameters for a type of beamforming on which the PDSCH is based, wherein the determination is based on an indication of whether the PDSCH is based on open loop beamforming (OLBF) or closed loop beamforming (CLBF); and
processing the PDSCH based on the DCI and the one or more beamforming parameters.

13. The method of claim 12 , wherein the PDSCH is scheduled for transmission on a new carrier type (NCT) different than a legacy carrier type (LCT), wherein the UE is a UE type capable of communicating on the NCT while other UE types are not capable of communicating on the NCT.

14. The method of claim 12 , wherein the downlink control channel comprises an enhanced physical downlink control channel (EPDCCH).

15. The method of claim 12 , wherein the determination is based on or more fields in the first DCI format.

16. The method of claim 12 , wherein the determination is based on an indication of at least one of: how many or which antenna ports are used for the beamforming.

17. The method of claim 12 , wherein:
the PDSCH is based on OLBF; and
a beam cycling resource granularity for the OLBF is based, at least in part, on resources assigned to the PDSCH.

18. The method of claim 17 , wherein:
the beam cycling resource granularity for the OLBF is further based on at least one of: a size of resources assigned to the PDSCH, whether resources assigned to the PDSCH are localized or distributed, or whether the PDSCH is broadcast or unicast.

19. The method of claim 18 , wherein:
a resource granularity of a physical resource block (PRB) or smaller is used if the size of resources assigned to the PDSCH is less than or equal to a first size; and
a resource granularity of at least a physical resource block group (PRG) is used if the size of resources assigned to the PDSCH is greater than the first size.

20. The method of claim 12 , wherein:
the PDSCH is based on OLBF; and
a beam cycling resource granularity for the OLBF is based, at least in part, on a type of search space of a control channel in which the DCI is transmitted.

21. The method of claim 12 , wherein:
the PDSCH is based on OLBF; and
a beam cycling resource granularity for the OLBF, under certain conditions, is less than a physical resource block (PRB) pair.

22. The method of claim 12 , wherein the determination is based on an indication of at least one beamforming parameter that is signaled semi-statically or dynamically.

23. The method of claim 12 , wherein the scheduled PDSCH comprises a multi-user multiple-input multiple-output (MU-MIMO) PDSCH.

24. The method of claim 12 , wherein the determination is based on at least one of a transmission port or transmission mode of the downlink control channel in which the DCI is transmitted.

25. The method of claim 24 , wherein the determination is based on a mapping of the downlink control channel ports to PDSCH ports.

26. The method of claim 12 , wherein a size of the first DCI format is dependent, at least in part, on a type of search space in which the downlink control channel is transmitted.

27. An apparatus for wireless communications by a user equipment (UE), comprising:
at least one processor configured to receive a downlink control channel with Downlink Control Information (DCI) of a first DCI format for scheduling a physical downlink shared channel (PDSCH), determine one or more parameters for a type of beamforming on which the PDSCH is based, wherein the determination is based on an indication of whether the PDSCH is based on open loop beamforming (OLBF) or closed loop beamforming (CLBF), and process the PDSCH based on the DCI and the one or more beamforming parameters; and
a memory coupled with the at least one processor.

28. A non-transitory computer readable medium for wireless communications by a user equipment (UE), the non-transitory computer readable medium having instructions stored thereon for:
receiving a downlink control channel with Downlink Control Information (DCI) of a first DCI format for scheduling a physical downlink shared channel (PDSCH);
determining one or more parameters for a type of beamforming on which the PDSCH is based, wherein the determination is based on an indication of whether the PDSCH is based on open loop beamforming (OLBF) or closed loop beamforming (CLBF); and
processing the PDSCH based on the DCI and the one or more beamforming parameters.

Assignees

• Qualcomm Inc

Inventors

• Chen Wanshi
• Gaal Peter
• Luo Tao
• Xu Hao
• Damnjanovic Aleksandar

Classifications

• H04W72/23 Primary

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

• H04B7/0452

  Multi-user MIMO systems · CPC title

• H04B7/0617

  for beam forming · CPC title

• H04B7/0619

  using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001) · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title