Spatial and frequency diversity design for machine type communications (MTC)

• US 10,868,591 B2
• Filed: 01/20/2016
• Issued: 12/15/2020
• Est. Priority Date: 01/21/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Xu, Hao, Gaal, Peter, Chen, Wanshi, Fakoorian, Seyed Ali Akbar
• Primary Examiner(s): Levitan, Dmitry
• Application Number:
  US15/002,208
• Publication Number:
  US 20160212750A1
• Time in Patent Office: 1,791 Days
• Field of Search: 370310, 370328, 370329, 370345, 370349
• 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 first type of device, the first type of device having more limited communications resources relative to a second type of device, wherein;

the more limited communications resources comprise reduced bandwidth, and the bundled transmission comprises multiple bursts wherein each burst spans a plurality of transmission time intervals (TTIs) and the same data is transmitted in each burst; and

modifying frequency diversity for the bundled transmission by performing frequency hopping on different bursts in the bundled transmission such that successive bursts are transmitted using different frequency resources.

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

3. The method of claim 1, wherein different frequency hopping patterns are used for performing the frequency hopping when transmitting data as bundled transmissions to different devices.

4. The method of claim 1, wherein a frequency hopping pattern used for performing the frequency hopping is determined, at least in part, on an identifier of a transmitting device.

5. The method of claim 1, wherein a gap between bursts is determined based on a time sufficient for frequency retuning by the first type of device.

6. The method of claim 1, further comprising modifying spatial diversity by

applying different precoding to different bursts in the bundled transmission.

7. The method of claim 1, wherein a same precoding is used within a burst.

8. The method of claim 6, wherein a type of the precoding cycling is dependent, at least in part, on a type of channel transmitted in the bundled transmission.

9. The method of claim 8, 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.

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

11. 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.

12. The method of claim 11, 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.

13. The method of claim 1, wherein the bundled transmission to the first type of 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 first type of device is different from a second bundle size used for the bundled transmission to the second device.

14. The method of claim 1, further comprising modifying time diversity by modifying a gap between different bursts in the bundled transmission.

15. An apparatus for wireless communications, comprising:

a transmitter to transmit data as a bundled transmission to a first type of device, the first type of device having more limited communications resources relative to a second type of device, wherein;

the more limited communications resources comprise reduced bandwidth, and the bundled transmission comprises multiple bursts wherein each burst spans a plurality of transmission time intervals (TTIs) and the same data is transmitted in each burst;

at least one processor; and

memory coupled to the at least one processor, the memory comprising code executable by the at least one processor to modify frequency diversity for the bundled transmission by performing frequency hopping on different bursts in the bundled transmission such that successive bursts are transmitted using different frequency resources.

16. A method for wireless communications by a first type of device, the first type of device having more limited communications resources relative to a second type of device, comprising:

receiving configuration information for modifying frequency diversity for a bundled transmission, the bundled transmission comprising multiple bursts wherein the same data is transmitted in each burst, by performing frequency hopping on different bursts in the bundled transmission such that successive bursts are received using different frequency resources; and

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

wherein the more limited communications resources comprise reduced bandwidth.

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

18. The method of claim 16, wherein different frequency hopping patterns are used when receiving data as bundled transmissions from different devices.

19. The method of claim 16, wherein the configuration information comprises a frequency hopping pattern determined based, at least in part, on an identifier of a transmitter.

20. The method of claim 16, wherein a gap between bursts is based on a time sufficient for frequency retuning by the first type of device.

21. The method of claim 16, wherein the configuration information is further for modifying spatial diversity by applying different precoding to different bursts in the bundled transmission.

22. The method of claim 16, wherein a same precoding is used within a burst.

23. The method of claim 21, wherein a type of precoding cycling is dependent, at least in part, on a type of channel received in the bundled transmission.

24. The method of claim 23, 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.

25. The method of claim 16, wherein a burst length comprises information indicating a gap of at least one transmission time interval (TTI) between bursts.

26. 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.

27. The method of claim 26, 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.

28. The method of claim 16, wherein the configuration information is further for modifying time diversity by modifying a gap between different bursts in the bundled transmission.

29. The method of claim 16, wherein the configuration information is further for modifying time diversity, and the configuration information for modifying time diversity comprises information indicating a gap of at least one transmission time interval (TTI) between bursts.

30. An apparatus for wireless communications by a first type of device, the first type of device having more limited communications resources relative to a second type of device, comprising:

a receiver to;

receive configuration information for modifying frequency diversity for a bundled transmission, the bundled transmission comprising multiple bursts wherein the same data is transmitted in each burst, by performing frequency hopping on different bursts in the bundled transmission such that successive bursts are received using different frequency resources; and

receive the bundled transmission;

at least one processor; and

memory coupled to the at least one processor, the memory comprising code executable by the at least one processor to;

process the bundled transmission in accordance with the configuration information,

wherein the more limited communications resources comprise reduced bandwidth.

31. An apparatus for wireless communications, comprising:

means for transmitting data as a bundled transmission to a first type of device, the first type of device having more limited communications resources relative to a second type of device, wherein;

the more limited communications resources comprise reduced bandwidth, and the bundled transmission comprises multiple bursts wherein each burst spans a plurality of transmission time intervals (TTIs) and the same data is transmitted in each burst; and

means for modifying frequency diversity for the bundled transmission by performing frequency hopping on different bursts in the bundled transmission such that successive bursts are transmitted using different frequency resources.

32. A non-transitory computer-readable medium for wireless communications by an apparatus, the computer-readable medium comprising code executable by at least one processor to cause the apparatus to:

transmit data as a bundled transmission to a first type of device, the first type of device having more limited communications resources relative to a second type of device, wherein;

the more limited communications resources comprise reduced bandwidth, and the bundled transmission comprises multiple bursts wherein each burst spans a plurality of transmission time intervals (TTIs) and the same data is transmitted in each burst; and

modify frequency diversity for the bundled transmission, by performing frequency hopping on different bursts in the bundled transmission such that successive bursts are transmitted using different frequency resources.

33. An apparatus for wireless communications by a first type of device, the first type of device having more limited communications resources relative to a second type of device, comprising:

means for receiving configuration information for modifying frequency diversity for a bundled transmission, the bundled transmission comprising multiple bursts wherein the same data is transmitted in each burst, by performing frequency hopping on different bursts in the bundled transmission such that successive bursts are received using different frequency resources; and

means for receiving and processing the bundled transmission in accordance with the configuration information,

wherein the more limited communications resources comprise reduced bandwidth.

34. A non-transitory computer-readable medium for wireless communications by a first type of device, the first type of device having more limited communications resources relative to a second type of device, the computer-readable medium comprising code executable by at least one processor to cause the first type of device to:

receive configuration information for modifying frequency diversity for a bundled transmission, the bundled transmission comprising multiple bursts wherein the same data is transmitted in each burst, by performing frequency hopping on different bursts in the bundled transmission such that successive bursts are received using different frequency resources; and

receive and process the bundled transmission in accordance with the configuration information,

wherein the more limited communications resources comprise reduced bandwidth.