Systems and methods for determining transmitter and receiver configurations for a wireless device

Patent metadata

Field	Value
Publication number	US-10615859-B2
Application number	US-201815769470-A
Country	US
Kind code	B2
Filing date	Mar 23, 2018
Priority date	Mar 24, 2017
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

Systems and methods of determining transmitter and receiver configurations for a wireless device are provided. In one exemplary embodiment, a method performed by a wireless device (105, 200, 300a-b, 500, 605) in a wireless communications system (100) comprises transmitting or receiving (403) a first signal of a first type (113) using a first transmitter or receiver configuration based on a first quasi co-location (QCL) assumption (121) associating the first signal with a first reference signal (111) received by the wireless device. Further, the method includes transmitting or receiving (407) a second signal of a second type (117) using a second transmitter or receiver configuration based on a second QCL assumption (123) associating the second signal with a second reference signal (115) received by the wireless device.

First claim

The invention claimed is:

1. A method performed by a wireless device in a wireless communications system, comprising:
transmitting, by the wireless device, a first signal of a first type using a first transmitter configuration based on a first quasi co-location (QCL) assumption associating the first signal with a first reference signal received by the wireless device; and
transmitting, by the wireless device, a second signal of a second type using a second transmitter configuration based on a second QCL assumption associating the second signal with a second reference signal received by the wireless device,
wherein the second type is different from the first type,
wherein the first QCL assumption is a spatial relation between the first reference signal received by the wireless device and transmission of the first signal of the first type by the wireless device, and
wherein the second QCL assumption is a spatial relation between the second reference signal received by the wireless device and transmission of the second signal of the second type by the wireless device.

2. The method of claim 1 , wherein the first reference signal is a broadcasted reference signal and the second reference signal is a user equipment (UE)-specific configured reference signal.

3. The method of claim 2 , wherein the broadcasted reference signal is a reference signal in a synchronization signal (SS) block and the UE-specific reference signal is a channel state information reference signal (CSI-RS).

4. The method of claim 1 , wherein the first signal is a common signal and the second signal is a user equipment (UE)-specific signal.

5. The method of claim 1 , wherein the first and second signals are user equipment (UE) specific signals.

6. The method of claim 1 , wherein the first reference signal is a reference signal in a preferred synchronization signal (SS) block and the first signal is a common search space or a group common search space of a physical downlink control channel (PDCCH).

7. The method of claim 1 , wherein the first reference signal is a reference signal in a preferred synchronization signal (SS) block and the first signal is a user equipment (UE) specific search space of a physical downlink control channel (PDCCH).

8. The method of claim 1 , wherein the second reference signal is a channel state information reference signal (CSI-RS) and the second signal is a demodulation reference signal (DMRS) for a user equipment (UE) specific search space of a physical downlink control channel (PDCCH).

9. The method of claim 1 , wherein the second reference signal is a channel state information reference signal (CSI-RS) and the second signal is a user equipment (UE) specific search space of a physical downlink control channel (PDCCH).

10. The method of claim 1 , wherein the second reference signal is a reference signal (RS) in a preferred synchronization signal (SS) block and the second signal is a physical random access channel (PRACH) signal or a beam failure recovery signal.

11. The method of claim 1 , wherein the second reference signal is a channel state information reference signal (CSI-RS) and the second signal is a physical uplink shared channel (PUSCH) signal.

12. The method of claim 1 , wherein the second reference signal is a channel state information reference signal (CSI-RS) and the second signal is a physical downlink shared channel (PDSCH).

13. The method of claim 1 , wherein the second reference signal is a channel state information reference signal (CSI-RS) and the second signal is a physical uplink control channel (PUCCH) signal.

14. The method of claim 1 , wherein the first receiver configuration corresponds to a beam direction used to receive the first reference signal.

15. The method of claim 1 , wherein the second transmitter configuration corresponds to a beam direction used to receive the second reference signal.

16. The method of claim 1 , further comprising:
determining the first transmitter configuration based on the first QCL assumption.

17. The method of claim 16 , wherein said determining the first transmitter configuration includes determining a transmit precoder to enable the transmission of the first signal based on receive beamforming weights that enabled the reception of the first reference signal.

18. The method of claim 1 , further comprising:
determining the second transmitter configuration based on the second QCL assumption.

19. The method of claim 18 , wherein said determining the second transmitter con-figuration includes determining a transmit precoder to enable the transmission of the second signal based on receive beamforming weights that enabled the reception of the second reference signal.

20. The method of claim 1 , further comprising:
receiving, by the wireless device, from a network node, an indication of the first or second QCL assumption.

21. The method of claim 20 , wherein said receiving the indication is by at least one of radio resource control (RRC) signaling, medium access control element (MAC-CE) signaling, and downlink control information (DCI) signaling.

22. The method of claim 1 , further comprising:
receiving, by the wireless device, the first and second reference signals.

23. A wireless device, comprising:
at least one processor and a memory, the memory comprising instructions executable by the at least one processor whereby the wireless device is configured to:
transmit a first signal of a first type using a first transmitter configuration based on a first quasi co-location (QCL) assumption associating the first signal with a first reference signal received by the wireless device; and
transmit a second signal of a second type using a second transmitter configuration based on a second QCL assumption associating the second signal with a second reference signal received by the wireless device,
wherein the second type is different from the first type,
wherein the first QCL assumption is a spatial relation between the first reference signal received by the wireless device and transmission of the first signal of the first type by the wireless device, and
wherein the second QCL assumption is a spatial relation between the second reference signal received by the wireless device and transmission of the second signal of the second type by the wireless device.

24. A method performed by a wireless device in a wireless communications system, comprising:
obtaining a plurality of quasi co-location (QCL) assumptions, with each assumption associating a certain reference signal reception by the wireless device with a transmission of a signal of a certain type by that wireless device; and
transmitting a signal of a certain type using a transmitter configuration based on the received QCL assumption that associates that signal with a reference signal received by the wireless device,
wherein the plurality of QCL assumptions comprise:
a first QCL assumption that is a spatial relation between a first reference signal received by the wireless device and transmission of the first signal of a first type by the wireless device, and
a second QCL assumption that is a spatial relation between a second reference signal received by the wireless device and transmission of the second signal of a second type by the wireless device, and

wherein the second type is different from the first type.

25. The method of claim 24 , wherein said obtaining includes:
receiving, from a network node, an

Assignees

• Ericsson Telefon Ab L M

Inventors

• Frenne Mattias
• Grant Stephen

Classifications

• H04B7/024

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04B7/0634

  Antenna weights or vector/matrix coefficients · CPC title

• H04B7/0617 Primary

  for beam forming · CPC title

• H04B7/0695

  using beam selection · CPC title