Discontinuous reception (DRX)-aware carrier sense adaptive transmission (CSAT) in shared spectrum

• US 9,756,679 B2
• Filed: 04/07/2015
• Issued: 09/05/2017
• Est. Priority Date: 04/11/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sadek, Ahmed Kamel
• Primary Examiner(s): Orgad, Edan
• Assistant Examiner(s): Latorre, Ivan O
• Application Number:
  US14/680,465
• Publication Number:
  US 20150296560A1
• Time in Patent Office: 882 Days
• Field of Search: 370230, 370336, 370252, 370278, 370329, 370328, 370335, 370337, 370311, 370254, 4555521, 4554521, 455450
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 76/16 Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points

Abstract

Systems and methods for Discontinuous Reception (DRX)-aware Carrier Sense Adaptive Transmission (CSAT) communication in shared spectrum are disclosed. An access point, for example, may receive signals via a medium in accordance with a first RAT, and identify utilization of the medium associated with the first RAT based on the received signals. Based on the identified utilization of the medium, operation of a second RAT may be cycled between activated and deactivated periods of transmission over the medium in accordance with a Time Division Multiplexing (TDM) communication pattern. A Medium Access Control (MAC) Control Element (CE) may be transmitted to an access terminal associated with the second RAT to activate or deactivate the access terminal in accordance with the TDM communication pattern. The timing of the MAC CE transmission may be based on the TDM communication pattern and a DRX pattern associated with the access terminal.

Claims

1. A method of Carrier Sense Adaptive Transmission (CSAT) for managing operation on a communication medium shared between Radio Access Technologies (RATs), comprising:

receiving signals via the communication medium in accordance with a first RAT;

identifying utilization of the communication medium associated with the first RAT based on the received signals;

cycling operation of a second RAT between activated and deactivated periods of transmission over the communication medium in accordance with a Time Division Multiplexing (TDM) communication pattern, wherein the cycling is based on the identified utilization of the communication medium; and

transmitting a Medium Access Control (MAC) Control Element (CE) to an access terminal associated with the second RAT to activate or deactivate the access terminal in accordance with the TDM communication pattern, wherein a timing of the MAC CE transmission is based on the TDM communication pattern and a Discontinuous Reception (DRX) pattern associated with the access terminal.

2. The method of claim 1, wherein the timing of the MAC CE transmission is offset from a transition boundary of the TDM communication pattern in response to the transition boundary of the TDM communication pattern aligning with a deactivated period of the DRX pattern.

3. The method of claim 2, wherein the transmitting comprises transmitting a MAC CE activation command after commencement of an activated period of the TDM communication pattern in response to an activated period of the DRX pattern being scheduled to begin during the activated period of the TDM communication pattern.

4. The method of claim 2, wherein the transmitting comprises transmitting a MAC CE deactivation command before commencement of a deactivated period of the TDM communication pattern in response to a deactivated period of the DRX pattern being scheduled to begin during an activated period of the TDM communication pattern.

5. The method of claim 1, further comprising setting the DRX pattern to align with at least a portion of the TDM communication pattern in response to the access terminal being a high-traffic access terminal.

6. The method of claim 5, further comprising identifying the access terminal as a high-traffic access terminal based on the access terminal being served on a frequency in the range of 5.15 GHz to 5.725 GHz.

7. The method of claim 5, wherein the setting comprises disabling DRX for the access terminal.

8. The method of claim 1, further comprising setting a DRX inactivity timer based on the TDM communication pattern.

9. The method of claim 1, wherein the communication medium is an unlicensed radio frequency band.

10. The method of claim 1, wherein:

the first RAT comprises Wi-Fi technology; and

the second RAT comprises Long Term Evolution (LTE) technology.

11. An apparatus for Carrier Sense Adaptive Transmission (CSAT) for managing operation on a communication medium shared between Radio Access Technologies (RATs), comprising:

a first transceiver configured to receive signals via the communication medium in accordance with a first RAT;

at least one processor;

at least one memory coupled to the at least one processor, the at least one processor and the at least one memory being configured to;

identify utilization of the communication medium associated with the first RAT based on the received signals, and

cycle operation of a second RAT between activated and deactivated periods of transmission over the communication medium in accordance with a Time Division Multiplexing (TDM) communication pattern, wherein the at least one processor and the at least one memory are configured to cycle operation of the second RAT based on the identified utilization of the communication medium; and

a second transceiver configured to transmit a Medium Access Control (MAC) Control Element (CE) to an access terminal associated with the second RAT to activate or deactivate the access terminal in accordance with the TDM communication pattern, wherein a timing of the MAC CE transmission is based on the TDM communication pattern and a Discontinuous Reception (DRX) pattern associated with the access terminal.

12. The apparatus of claim 11, wherein the timing of the MAC CE transmission is offset from a transition boundary of the TDM communication pattern in response to the transition boundary of the TDM communication pattern aligning with a deactivated period of the DRX pattern.

13. The apparatus of claim 12, wherein the second transceiver is configured to transmit a MAC CE activation command after commencement of an activated period of the TDM communication pattern in response to an activated period of the DRX pattern being scheduled to begin during the activated period of the TDM communication pattern.

14. The apparatus of claim 12, wherein the second transceiver is configured to transmit a MAC CE deactivation command before commencement of a deactivated period of the TDM communication pattern in response to a deactivated period of the DRX pattern being scheduled to begin during an activated period of the TDM communication pattern.

15. The apparatus of claim 11, wherein the at least one processor and the at least one memory are further configured to set the DRX pattern to align with at least a portion of the TDM communication pattern in response to the access terminal being a high-traffic access terminal.

16. The apparatus of claim 15, wherein the at least one processor and the at least one memory are further configured to identify the access terminal as a high-traffic access terminal based on the access terminal being served on a frequency in the range of 5.15 GHz to 5.725 GHz.

17. The apparatus of claim 15, wherein the at least one processor and the at least one memory are configured to set the DRX pattern by disabling DRX for the access terminal.

18. The apparatus of claim 11, wherein the at least one processor and the at least one memory are further configured to set a DRX inactivity timer based on the TDM communication pattern.

19. The apparatus of claim 11, wherein the communication medium is an unlicensed radio frequency band.

20. The apparatus of claim 11, wherein:

the first RAT comprises Wi-Fi technology; and

the second RAT comprises Long Term Evolution (LTE) technology.

21. An apparatus for Carrier Sense Adaptive Transmission (CSAT) for managing operation on a communication medium shared between Radio Access Technologies (RATs), comprising:

means for receiving signals via the communication medium in accordance with a first RAT;

means for identifying utilization of the communication medium associated with the first RAT based on the received signals;

means for cycling operation of a second RAT between activated and deactivated periods of transmission over the communication medium in accordance with a Time Division Multiplexing (TDM) communication pattern, wherein the cycling is based on the identified utilization of the communication medium; and

means for transmitting a Medium Access Control (MAC) Control Element (CE) to an access terminal associated with the second RAT to activate or deactivate the access terminal in accordance with the TDM communication pattern, wherein a timing of the MAC CE transmission is based on the TDM communication pattern and a Discontinuous Reception (DRX) pattern associated with the access terminal.

22. The apparatus of claim 21, wherein the timing of the MAC CE transmission is offset from a transition boundary of the TDM communication pattern in response to the transition boundary of the TDM communication pattern aligning with a deactivated period of the DRX pattern.

23. The apparatus of claim 22, wherein the means for transmitting comprises means for transmitting a MAC CE activation command after commencement of an activated period of the TDM communication pattern in response to an activated period of the DRX pattern being scheduled to begin during the activated period of the TDM communication pattern.

24. The apparatus of claim 22, wherein the means for transmitting comprises means for transmitting a MAC CE deactivation command before commencement of a deactivated period of the TDM communication pattern in response to a deactivated period of the DRX pattern being scheduled to begin during an activated period of the TDM communication pattern.

25. The apparatus of claim 21, wherein:

the communication medium is an unlicensed radio frequency band;

the first RAT comprises Wi-Fi technology; and

the second RAT comprises Long Term Evolution (LTE) technology.

26. A non-transitory computer-readable medium comprising instructions, which, when executed by a processor, cause the processor to perform operations for Carrier Sense Adaptive Transmission (CSAT) for managing operation on a communication medium shared between Radio Access Technologies (RATs), the non-transitory computer-readable medium comprising:

instructions for receiving signals via the communication medium in accordance with a first RAT;

instructions for identifying utilization of the communication medium associated with the first RAT based on the received signals;

instructions for cycling operation of a second RAT between activated and deactivated periods of transmission over the communication medium in accordance with a Time Division Multiplexing (TDM) communication pattern, wherein the cycling is based on the identified utilization of the communication medium; and

instructions for transmitting a Medium Access Control (MAC) Control Element (CE) to an access terminal associated with the second RAT to activate or deactivate the access terminal in accordance with the TDM communication pattern, wherein a timing of the MAC CE transmission is based on the TDM communication pattern and a Discontinuous Reception (DRX) pattern associated with the access terminal.

27. The non-transitory computer-readable medium of claim 26, wherein the timing of the MAC CE transmission is offset from a transition boundary of the TDM communication pattern in response to the transition boundary of the TDM communication pattern aligning with a deactivated period of the DRX pattern.

28. The non-transitory computer-readable medium of claim 27, wherein the instructions for transmitting comprise instructions for transmitting a MAC CE activation command after commencement of an activated period of the TDM communication pattern in response to an activated period of the DRX pattern being scheduled to begin during the activated period of the TDM communication pattern.

29. The non-transitory computer-readable medium of claim 27, wherein the instructions for transmitting comprise instructions for transmitting a MAC CE deactivation command before commencement of a deactivated period of the TDM communication pattern in response to a deactivated period of the DRX pattern being scheduled to begin during an activated period of the TDM communication pattern.

30. The non-transitory computer-readable medium of claim 26, wherein:

the communication medium is an unlicensed radio frequency band;

the first RAT comprises Wi-Fi technology; and

the second RAT comprises Long Term Evolution (LTE) technology.