SPATIAL AND FREQUENCY DIVERSITY DESIGN FOR MACHINE TYPE COMMUNICATIONS (MTC)

• US 20160212750A1
• Filed: 01/20/2016
• Published: 07/21/2016
• Est. Priority Date: 01/21/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: FAKOORIAN, Seyed Ali Akbar, XU, Hao, GAAL, Peter, CHEN, Wanshi
• Granted Patent: US 10,868,591 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04L 1/02 by diversity reception
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]

Abstract

Certain aspects of the present disclosure generally relate to wireless communications, and more specifically to increased diversity for devices with limited communications resources. An example method generally includes transmitting data as a bundled transmission to a device with limited communications resources, the bundled transmission comprising multiple bursts wherein each burst spans a plurality of transmission time intervals (TTIs) and the same data is transmitted in each burst, and taking action to increase diversity (e.g., at least one of spatial diversity, time diversity, frequency diversity, etc.) for the bundled transmission.

Claims

1. A method for wireless communications, comprising:

transmitting data as a bundled transmission to a device with limited communications resources, the bundled transmission comprising multiple bursts wherein each burst spans a plurality of transmission time intervals (TTIs) and the same data is transmitted in each burst; and

increasing at least one of spatial diversity, time diversity, or frequency diversity for the bundled transmission.

2. The method of claim 1, wherein each burst is transmitted in a narrowband of no more than six resource blocks (RBs).

3. The method of claim 1, wherein the increasing frequency diversity comprises:

performing frequency hopping such that successive bursts are transmitted using different frequency resources.

4. The method of claim 3, wherein different frequency hopping patterns are used for performing frequency hopping when transmitting data as bundled transmissions to different devices.

5. The method of claim 3, wherein a frequency hopping pattern used for performing the frequency hopping is determined, at least in part, on an identifier of a transmitting device.

6. The method of claim 3, wherein a gap between bursts is determined based on a time sufficient for frequency retuning by the device.

7. The method of claim 1, wherein the increasing spatial diversity comprises:

applying precoding cycling such that successive bursts are transmitted using different precoding.

8. The method of claim 7, wherein a same precoding is used within a burst.

9. The method of claim 7, wherein a type of precoding cycling is dependent, at least in part, on a type of channel transmitted in the bundled transmission.

10. The method of claim 9, wherein for a physical downlink shared channel (PDSCH), the precoding cycling utilizes a mapping of at least two antenna ports to at least two beam directions.

11. The method of claim 1, wherein at least one of a burst length or the increasing time diversity is based, at least in part, on maintaining a gap of at least one TTI between bursts.

12. The method of claim 1, wherein at least one of a burst length or a duration of a gap between bursts is dependent on an uplink/downlink subframe configuration.

13. The method of claim 12, wherein at least one of the burst length or the duration of the gap between bursts is dependent on a number of consecutive subframes of a same type.

14. The method of claim 1, wherein the bundled transmission to the device is multiplexed with data transmitted as a bundled transmission to a second device, and wherein a bundle size used for the bundled transmission to the device is different from a second bundle size used for the bundled transmission to the second device.

15. An apparatus for wireless communications, comprising:

a transmitter configured to transmit data as a bundled transmission to a device with limited communications resources, the bundled transmission comprising multiple bursts wherein each burst spans a plurality of transmission time intervals (TTIs) and the same data is transmitted in each burst; and

at least one processor configured to take action to increase at least one of spatial diversity, time diversity, or frequency diversity for the bundled transmission.

16. A method for wireless communications by a device with limited communications resources, comprising:

receiving configuration information for increasing at least one of spatial diversity, time diversity, or frequency diversity for a bundled transmission, the bundled transmission comprising multiple bursts wherein the same data is transmitted in each burst; and

receiving and processing the bundled transmission in accordance with the configuration information.

17. The method of claim 16, wherein each burst is received in a narrowband of no more than six resource blocks (RBs).

18. The method of claim 16, wherein the configuration information for increasing frequency diversity comprises information indicating that frequency hopping is used such that successive bursts are received using different frequency resources.

19. The method of claim 18, wherein different frequency hopping patterns are used when receiving data as bundled transmissions from different devices.

20. The method of claim 18, wherein the configuration information comprises a frequency hopping pattern determined based, at least in part, on an identifier of a transmitter.

21. The method of claim 18, wherein a gap between bursts is based on a time sufficient for frequency retuning by the device with limited communications resources.

22. The method of claim 16, wherein the configuration information for increasing spatial diversity comprises information indicating that successive bursts are received with different precoding.

23. The method of claim 22, wherein a same precoding is used within a burst.

24. The method of claim 22, wherein a type of precoding cycling is dependent, at least in part, on a type of channel received in the bundled transmission.

25. The method of claim 24, wherein, for a physical downlink shared channel (PDSCH), the precoding cycling utilizes a mapping of at least two antenna ports to at least two beam directions.

26. The method of claim 16, wherein at least one of a burst length or the configuration information for increasing time diversity comprises information indicating a gap of at least one transmission time interval (TTI) between bursts.

27. The method of claim 16, wherein at least one of a burst length or a duration of a gap between bursts is dependent on an uplink/downlink subframe configuration.

28. The method of claim 27, wherein at least one of the burst length or the duration of the gap between bursts is dependent on a number of consecutive subframes of a same type.

29. An apparatus for wireless communications by a device with limited communications resources, comprising:

a receiver configured to;

receive configuration information for increasing at least one of spatial diversity, time diversity, or frequency diversity for a bundled transmission, the bundled transmission comprising multiple bursts wherein the same data is transmitted in each burst; and

receive a bundled transmission; and

at least one processor configured to;

process the bundled transmission in accordance with the configuration information.