METHODS AND APPARATUS FOR POWER EFFICIENT OPERATION OF LTE BASED MACHINE TYPE COMMUNICATIONS

• US 20140198663A1
• Filed: 01/09/2014
• Published: 07/17/2014
• Est. Priority Date: 01/17/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: XU, Hao, JI, Tingfang, GAAL, Peter, CHEN, Wanshi, MALLADI, Durga Prasad
• Granted Patent: US 9,681,465 B2
• Time in Patent Office: Days
• US Class Current: 370/241
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0258 controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 72/569 of the traffic information
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to techniques for power efficient operation of LTE MTC. A method is provided wireless communications by a user equipment (UE). The method generally includes signaling information regarding traffic requirements for the UE to a base station (BS) for use in persistent scheduling (PS), receiving signaling from the BS indicating PS opportunities of traffic for the UE, powering on the radio components for the PS opportunities, and powering down radio components between PS opportunities when traffic is not expected.

Claims

1. A method of wireless communications by a user equipment (UE), comprising:

signaling information regarding one or more traffic requirements for the UE to a base station (BS) for use in persistent scheduling (PS);

receiving signaling from the BS indicating one or more PS opportunities of traffic for the UE;

powering down one or more radio components between PS opportunities when traffic is not expected; and

powering on the radio components for the PS opportunities.

2. The method of claim 1, wherein the information comprises at least one of expected downlink and uplink traffic arrival rate, delay tolerance, or traffic size.

3. The method of claim 1, further comprising, while the radio components are powered down between PS opportunities, refraining from performing one or more of:

monitoring for UL assignments;

waking up for a hybrid automatic retransmission request (HARQ) retransmission; and

monitoring a physical HARQ indicator channel (PHICH).

4. The method of claim 1, further comprising:

detecting traffic for the UE to send or receive before a next PS opportunity; and

powering on or maintaining power for the radio components for the traffic for the UE to send or receive before a next PS opportunity.

5. The method of claim 4, wherein the detecting comprises receiving an indication of traffic from the BS.

6. The method of claim 5, wherein the indication of traffic is provided by the BS in a same subframe as one of the PS opportunities.

7. The method of claim 5, wherein the indication of traffic is provided in at least one of:

a downlink physical control channel or one or more bits of a data channel transmitted in the PS opportunity.

8. The method of claim 4, wherein the detecting comprises detecting a page indicating downlink data for the UE.

9. The method of claim 8, wherein scheduling information for the downlink data is provided in at least one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (ePDCCH).

10. The method of claim 4, wherein:

the traffic to send or receive before a next PS opportunity comprises uplink data; and

the UE performs a random access channel (RACH) procedure to signal the uplink data to the BS.

11. The method of claim 10, wherein the UE reveals a unique identity of the UE via the RACH procedure.

12. The method of claim 1, further comprising:

after powering on the radio components, searching through a limited frequency raster set that is a subset of a full frequency raster set defined by a standard.

13. The method of claim 1, further comprising:

detecting traffic for the UE to send or receive on resources that are not persistently scheduled during a next PS opportunity; and

powering on or maintaining power for the radio components for the traffic for the UE to send or receive on resources that are not persistently scheduled during the next PS opportunity.

14. The method of claim 13, wherein the traffic for the UE to send or receive on resources that are not persistently scheduled during a next PS opportunity comprises uplink data, the method further comprising:

performing a random access channel (RACH) procedure to signal the uplink data to the BS; and

revealing a random network temporary identifier (RNTI) of the UE in the RACH procedure.

15. An apparatus for wireless communications, comprising:

at least one processor configured to;

signal information regarding one or more traffic requirements for the apparatus to a base station (BS) for use in persistent scheduling (PS);

receive signaling from the BS indicating one or more PS opportunities of traffic for the apparatus;

power down one or more radio components between PS opportunities when traffic is not expected; and

power on the radio components for the PS opportunities; and

a memory coupled with the at least one processor.

16. The apparatus of claim 15, wherein the information regarding traffic requirements comprises at least one of expected downlink and uplink traffic arrival rate, delay tolerance, or traffic size.

17. The apparatus of claim 16, wherein, while the radio components are powered down between PS opportunities, the apparatus refrains from one or more of:

monitoring for UL assignments;

waking up for a hybrid automatic retransmission request (HARQ) retransmission; and

monitoring a physical HARQ indicator channel (PHICH).

18. The apparatus of claim 15, wherein the at least one processor is further configured to:

detect traffic for the apparatus to send or receive before a next PS opportunity; and

power on or maintain power for the radio components for the traffic for the apparatus to send or receive before a next PS opportunity.

22. The apparatus of claim 18, wherein the detecting comprises detecting a page indicating downlink data for the apparatus.

23. The apparatus of claim 22, wherein scheduling information for the downlink data is provided in at least one of a physical downlink control channel (PDCCH) or an evolved PDCCH.

24. The apparatus of claim 18, wherein:

the traffic to send or receive before a next PS opportunity comprises uplink data; and

the at least one processor is further configured to;

perform a random access channel (RACH) procedure to signal the uplink data to the BS.

25. The apparatus of claim 24, wherein the at least one processor is further configured to reveal a unique identity of the apparatus via the RACH procedure.

26. The apparatus of claim 15, wherein the at least one processor is further configured to:

search through a limited frequency raster set that is a subset of a full frequency raster set defined by a standard, after powering on the radio components.

27. The apparatus of claim 15, wherein the at least one processor is further configured to:

detect traffic for the apparatus to send or receive on resources that are not persistently scheduled during a next PS opportunity; and

power on or maintain power for the radio components for the traffic for the apparatus to send or receive on resources that are not persistently scheduled during a next opportunity.

28. The apparatus of claim 27, wherein:

the traffic for the apparatus to send or receive on resources that are not persistently scheduled during a next PS opportunity comprises uplink data;

the at least one processor is further configured to;

perform a random access channel (RACH) procedure to signal the uplink data to the BS; and

reveal a random network temporary identifier (RNTI) of the apparatus in the RACH procedure.

19. The apparatus of claim 19, wherein the detecting comprises receiving an indication of traffic from the BS.

20. The apparatus of claim 19, wherein the indication of traffic is provided by the BS in a same subframe as one of the PS opportunities.

21. The apparatus of claim 19, wherein the indication of traffic is provided in at least one of:

a downlink physical control channel or one or more bits of a data channel transmitted in the PS opportunity.

29. An apparatus for wireless communications, comprising:

means for signaling information regarding one or more traffic requirements for the apparatus to a base station (BS) for use in persistent scheduling (PS);

means for receiving signaling from the BS indicating one or more PS opportunities of traffic for the apparatus;

means for powering down radio components between PS opportunities when traffic is not expected; and

means for powering on the radio components for the PS opportunities.

30. A computer program product comprising a non-transitory computer-readable medium comprising instructions executable to:

signal information regarding one or more traffic requirements for the computer to a base station (BS) for use in persistent scheduling (PS);

receive signaling from the BS indicating one or more PS opportunities of traffic for the computer;

power down the radio components between PS opportunities when traffic is not expected; and

power on radio components for the PS opportunities.