Downlink multiplexing and MAC signaling for a system with devices operating with and without low power companion receivers

• US 10,104,616 B2
• Filed: 02/25/2016
• Issued: 10/16/2018
• Est. Priority Date: 06/22/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ang, Peter Pui Lok, Shellhammer, Stephen Jay, Soriaga, Joseph Binamira, Bhushan, Naga, Ji, Tingfang, Nguyen, Cong, Burke, Joseph Patrick, Zeng, Wei, Jiang, Jing
• Primary Examiner(s): Ly, Anh-Vu
• Assistant Examiner(s): Reyes Ortiz, Hector
• Application Number:
  US15/053,679
• Publication Number:
  US 20160374022A1
• Time in Patent Office: 964 Days
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Systems and methods are disclosed for enhancing the power efficiency of low power internet of everything (IOE) devices or user equipments (UEs). A UE or IOE having a low power companion receiver maintains its full power receiver in a sleep state until it receives a wake up indicator from a base station. In response to the wake up signal, the UE or IOE powers up its full power receiver and receives data from the base station. The base station further schedules the wake up signals so as not to collide with control signals expected by UEs or IOEs without low power receivers, or those UEs and IOEs are configured to detect and react to the wake up signals.

Claims

1. A method of wireless communication, comprising:

determining, by a first wireless communication device, between transmitting a wake-up paging indicator (WUPI) to a second wireless communication device and a signal to a third wireless communication device based on whether the WUPI is ready to be sent;

transmitting, from the first wireless communication device in response to determining to transmit the WUPI, the WUPI during a first transmission time interval (TTI), the WUPI indicating to the second wireless communication device to wake up and listen for a data signal from the first wireless communication device during a second TTI;

transmitting, from the first wireless communication device to the second wireless communication device, the data signal during the second TTI; and

including both the WUPI and the data signal in an orthogonal frequency division multiplexing (OFDM) waveform.

2. The method of claim 1, wherein:

the WUPI is transmitted to a first receiver of the second wireless communication device and the data signal is transmitted to a second receiver of the second wireless communication device, and

the first receiver is a lower power receiver than the second receiver.

3. The method of claim 1, further comprising:

modulating an OFDM subcarrier of the OFDM waveform containing the WUPI with on-off keying (OOK); and

modulating an OFDM subcarrier containing the data signal with quadrature amplitude modulation (QAM).

4. The method of claim 1, further comprising:

allocating, at the first wireless communication device, a set of channel resources to the second wireless communication device for transmitting the WUPI,

wherein the determining further comprises determining between transmitting the WUPI using the set of channel resources and the signal using the set of channel resources.

5. The method of claim 1, further comprising:

transmitting, from the first wireless communication device, a control signal.

6. The method of claim 5, wherein the control signal includes information that the third wireless communication device uses to turn off a receiver for an indicated amount of TTIs.

7. The method of claim 5, further comprising:

transmitting the control signal on a first frequency bandwidth according to a first form of modulation; and

transmitting the WUPI on a second frequency bandwidth according to a second form of modulation different from the first form of modulation during the first TTI, wherein the first and second frequency bandwidth are non-overlapping.

8. The method of claim 1, further comprising:

designating, at the first wireless communication device, a time window within a data cycle for transmitting at least one WUPI,

wherein the time window comprises at least an amount of TTIs equivalent to an expected amount of WUPIs that will be transmitted during the data cycle.

9. The method of claim 8, further comprising:

assigning, at the first wireless communication device, a unique code to the second wireless communication device; and

encoding, at the first wireless communication device, the at least one WUPI with the unique code assigned to the second wireless communication device.

10. The method of claim 8, further comprising:

assigning, at the first wireless communication device, a second code common to all of a plurality of second wireless devices;

encoding, at the first wireless communication device, the WUPI with the second code; and

transmitting, from the first wireless communication device, the WUPI to the plurality of second wireless devices.

11. The method of claim 1, wherein:

the first wireless communication device comprises a base station;

the second wireless communication device comprises a low power internet of everything device; and

the third wireless communication device comprises a user equipment.

12. A method of wireless communication, comprising:

receiving, at a first wireless communication device from a second wireless communication device in response to a determination between transmitting a wake-up paging indicator (WUPI) to the first wireless communication device and a signal to a third wireless communication device based on whether the WUPI is ready to be sent, the WUPI during a first transmission time interval (TTI);

waking up, at the first wireless communication device, in response to receipt of the WUPI;

listening, at the first wireless communication device, for a data signal from the second wireless communication device during a second TTI after the first TTI; and

receiving, at the first wireless communication device from the second wireless communication device, the data signal during the second TTI,

wherein the WUPI and the data signal are both included in an orthogonal frequency division multiplexing (OFDM) waveform.

13. The method of claim 12, further comprising:

receiving the WUPI at a first receiver of the first wireless communication device; and

receiving the data signal at a second receiver of the first wireless communication device,

wherein the first receiver is a lower power receiver than the second receiver.

14. The method of claim 12, wherein an OFDM subcarrier containing the WUPI is modulated with on-off keying (OOK) and an OFDM subcarrier containing the data signal is modulated with quadrature amplitude modulation (QAM).

15. The method of claim 12, further comprising:

receiving, at the first wireless communication device from the second wireless communication device, an allocation of a set of channel resources, the determination being between transmitting the WUPI using the set of channel resources and the signal using the set of channel resources, and wherein the signal comprises a data signal; and

monitoring, at the first wireless communication device, the set of channel resources for the WUPI.

16. The method of claim 15, further comprising:

transmitting, from the first wireless communication device to the second wireless communication device, a request for the WUPI.

17. The method of claim 12, further comprising:

receiving, at the first wireless communication device from the second wireless communication device, an indication of a time window within a data cycle during which the WUPI will be transmitted.

18. The method of claim 12, further comprising:

receiving, at the first wireless communication device from the second wireless communication device, a unique code,

wherein the WUPI is encoded with the unique code.

19. The method of claim 12, further comprising:

receiving, at the first wireless communication device from the second wireless communication device, a common code,

wherein the WUPI is encoded with the common code.

20. The method of claim 12, wherein:

the first wireless communication device comprises a low power internet of everything device;

the second wireless communication device comprises a base station; and

the third wireless communication device comprises a user equipment.

21. A first wireless communication device, comprising:

a processor configured to;

allocate a set of channel resources to a second wireless communication device for transmission of a wake-up paging indicator (WUPI) to the second wireless communication device;

determine between transmitting the WUPI to the second wireless communication device using the set of channel resources and a signal to a third wireless communication device using the set of channel resources based on whether the WUPI is scheduled to be sent;

generate the WUPI and a data signal in response to determining to transmit the WUPI; and

include both the WUPI and the data signal in an orthogonal frequency division multiplexing (OFDM) waveform; and

a transceiver configured to transmit the WUPI to the second wireless communication device during a first transmission time interval (TTI) and to transmit the data signal to the second wireless communication device during a second TTI,

wherein the WUPI indicates to the second wireless communication device to wake up and listen for the data signal.

22. The first wireless communication device of claim 21, wherein:

the transceiver transmits the WUPI to a first receiver of the second wireless communication device,

the transceiver transmits the data signal to a second receiver of the second wireless communication device, and

the first receiver is a lower power receiver than the second receiver.

23. The first wireless communication device of claim 21, wherein:

the processor is further configured to determine a number of TTIs including the first TTI required to transmit the WUPI prior to the second TTI; and

the transceiver is further configured to transmit the determined number of TTIs to the third wireless communication device that the third wireless communication device uses to turn off a receiver for the determined number of TTIs.

24. The first wireless communication device of claim 21, wherein:

the processor is further configured to designate a time window within a data cycle for transmitting at least one WUPI, and

the time window comprises at least an amount of TTIs equivalent to an average amount of WUPIs that will be transmitted during the data cycle.

25. The first wireless communication device of claim 21, wherein the processor is further configured to:

assign a unique code to the second wireless communication device, and

encode the WUPI with the unique code assigned to the second wireless communication device.

26. A first wireless communication device, comprising:

a first receiver configured to receive a wake-up paging indicator (WUPI) from a second wireless communication device during a first transmission time interval (TTI) in response to a determination between transmitting the WUPI to the first wireless communication device and a signal to a third wireless communication device based on whether the WUPI is ready to be sent; and

a processor configured to detect the WUPI and wake up a second receiver in response to receipt of the WUPI,

wherein the second receiver is configured to receive a data signal from the second wireless communication device after waking up during a second TTI after the first TTI, and

wherein the WUPI and the data signal are both included in an orthogonal frequency division multiplexing (OFDM) waveform.

27. The first wireless communication device of claim 26, wherein the first receiver is a lower power receiver than the second receiver.

28. The first wireless communication device of claim 26, wherein the first receiver is further configured to:

receive, from the second wireless communication device, an allocation of a set of channel resources, the determination being between transmitting the WUPI using the set of channel resources and the signal using the set of channel resources and the signal, and wherein the signal comprises a data signal, and

monitor the set of channel resources for the WUPI.

29. The first wireless communication device of claim 26, wherein:

the first receiver is further configured to receive from the second wireless communication device a unique code, the WUPI being encoded with the unique code, and

the processor is further configured to decode the WUPI using the received unique code.

30. The first wireless communication device of claim 26, wherein:

the first receiver is further configured to receive from the second wireless communication device a common code, the WUPI being encoded with the common code, and

the processor is further configured to decode the WUPI using the received common code.