System and method for power savings in a wireless communication network

• US 20090209223A1
• Filed: 02/14/2008
• Published: 08/20/2009
• Est. Priority Date: 02/14/2008
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Kone, Mamadou, Chiu, Yu-Min, Yen, Hung-Jie
• Granted Patent: US 8,095,106 B2
• Time in Patent Office: Days
• US Class Current: 455/343.100
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for power savings in a wireless communications network including selecting one or more connections with common performance characteristics to create a plurality of power savings classes, attributing a power savings window size to each power savings class, and aligning power savings classes with the same start time to generate an aligned power savings class. In addition, the method includes communicating the plurality of power savings classes and each associated power savings window size to a base station.

Claims

1. A method for power savings in a wireless communications network, comprising:

selecting one or more connections with common performance characteristics to create a plurality of power savings classes;

attributing a power savings window size to each power savings class;

aligning power savings classes with a same start time to generate a plurality of aligned power savings classes; and

communicating the plurality of power savings classes and each associated power savings window size to a base station.

2. The method as in claim 1, including:

monitoring a threshold communications inactivity period;

determining if the threshold communications inactivity period exceeds a threshold; and

initiating the selecting and the attributing when the threshold communications inactivity period exceeds the threshold.

3. The method as in claim 1, wherein selecting connections with common performance characteristics further includes:

sorting connections by real-time connections or non-real-time connections;

horizontally sorting the real-time connections into hybrid power savings classes and pure power savings classes, including;

grouping the hybrid power savings classes based on key parameters; and

vertically sorting the pure power savings classes based on key parameters; and

vertically sorting the non-real-time connections into vertical non-real-time power savings classes, including;

horizontally sorting the vertical non-real-time power savings classes based on an urgency bit to create two non-real-time power savings classes.

4. The method as in claim 3, wherein the grouping of hybrid power savings classes based on key parameters further includes:

determining a maximum latency for each proposed member of the hybrid power savings class;

determining one of a polling interval or a grant interval for each proposed member of the hybrid power savings class;

determining when one or more of the maximum latencies for all proposed members of the hybrid power savings class are equal;

determining when one or more of the polling intervals or the grant intervals for all proposed members of the hybrid power savings class are equal or integer multiples of each other; and

including the proposed member in the hybrid power savings class when the maximum latencies are equal and all polling intervals and grant intervals are equal or integer multiples of each other.

5. The method as in claim 4, wherein the vertically sorting of the pure power savings classes based on key parameters further includes:

determining the maximum latency for each proposed member of the pure power savings class;

determining when one or more of the maximum latencies for all proposed members of the pure power savings class are equal or integer multiples of each other;

determining a smallest maximum latency; and

using the smallest maximum latency to determine a sleep window and a listening window.

6. The method as in claim 5, wherein the vertically sorting of the pure power savings classes based on key parameters further includes:

determining if a tolerated jitter is defined for one or more of the members of the pure power savings class;

determining if a longest tolerated jitter is smaller than or equal to one-half of the smallest maximum latency for the proposed members of the pure power savings class; and

using, when the longest tolerated jitter is defined for all of the members of the pure power savings class and the tolerated jitter is smaller than or equal to one-half of the smallest maximum latency of the pure power savings class, the longest tolerated jitter as the listening window for the pure power savings class.

7. The method as in claim 6, wherein the attributing of a power savings window size to each power savings class includes:

determining, from the connection with a smallest maximum latency, the power savings window size for a UGS pure power savings class, by setting the listening window as the longest tolerated jitter, and setting the sleep window as the remainder of the smallest maximum latency after subtracting the longest tolerated jitter;

determining, from the length of the longest tolerated jitter, the power savings window size for a UGS hybrid power savings class without RT-VR, by setting the longest tolerated jitter equal to the listening window, and setting the sleep window equal to the remainder of the shortest unsolicited grant interval after subtracting the longest tolerated jitter;

determining, from the connection with the smallest maximum latency, the power savings window size for an ERT-VR pure power savings class, when all power savings class members have a tolerated jitter, by setting the listening window as the longest tolerated jitter, and setting the sleep window as the remainder of the smallest maximum latency after subtracting the longest tolerated jitter;

determining, from the connection with the smallest maximum latency, the power savings window size for the ERT-VR pure power savings class, when not all power savings class members have a tolerated jitter, by adding a number of frames needed to send a maximum rate of packets to a bandwidth request frame to determine the listening window, and setting the sleep window as the remainder of the smallest maximum latency after subtracting the listening window;

determining, from utilizing a minimum reserved traffic rate, the power savings window size for an RT-VR pure power savings class, by adding a number of frames needed for uplink service to a bandwidth request frame to determine the listening window and setting the sleep window as the remainder of the smallest maximum latency after subtracting the listening window;

determining, from the tolerated jitter size and the number of frames needed to send a packet, from utilizing the minimum reserved traffic rate, the power savings window size for an RT-VR hybrid power savings class to determine the listening window;

determining, from a bandwidth contention capacity, the power savings window size for an NRT-VR power savings class to initialize the sleep window;

determining, from a bandwidth contention capacity, the power savings window size for a BE power savings class to initialize the sleep window; and

determining, from the minimum of a next frame offset time and a next periodic ranging time, the power savings window size for a multicast and management connections power savings class to determine the sleep window.

8. The method as in claim 1, wherein the connections includes QoS classes of UGS, ERT-VR, RT-VR, NRT-VR, BE, and multicast and management connections, where UGS, ERT-VR, RT-VR are real-time connections and NRT-VR and BE are non-real-time connections.

9. A wireless communication mobile station for wireless communication, the wireless communication mobile station comprising:

at least one memory to store data and instructions; and

at least one processor configured to access the memory and configured to, when executing the instructions;

determine a number and type of connections;

select one or more of the connections with common performance characteristics to create a plurality of power savings classes;

attribute a power savings window size to each power savings class;

align power savings classes, with a same start time, to generate an aligned power savings class; and

communicating the plurality of power savings classes and each associated power savings window size to a base station.

10. The wireless communication mobile station as in claim 9, wherein the at least one processor is further configured to execute instructions including:

monitoring a threshold communications inactivity period;

determining if the threshold communications inactivity period exceeds a threshold; and

initiating the selecting and the attributing when the threshold communications inactivity period exceeds the threshold.

11. The wireless communication mobile station as in claim 9, wherein when executing the instructions, selecting connections with common performance characteristics includes:

sorting connections by real-time connections or non-real-time connections;

horizontally sorting the real-time connections into hybrid power savings classes and pure power savings classes, including;

grouping the hybrid power savings classes based on key parameters; and

vertically sorting the pure power savings classes based on key parameters; and

vertically sorting the non-real-time connections into vertical non-real-time power savings classes, including;

horizontally sorting the vertical non-real-time power savings classes based on an urgency bit to create two non-real-time power savings classes.

12. The wireless communication mobile station as in claim 11, wherein when executing the instructions, the grouping of hybrid power savings classes based on key parameters includes:

determining a maximum latency for each proposed member of the hybrid power savings class;

determining one of a polling interval or a grant interval for each proposed member of the hybrid power savings class;

determining when one or more of the maximum latencies for all proposed members of the hybrid power savings class are equal;

determining when one or more of the polling intervals or the grant intervals for all proposed members of the hybrid power savings class are equal or integer multiples of each other; and

including the proposed member in the hybrid power savings class when the maximum latencies are equal and all polling intervals and grant intervals are equal or integer multiples of each other.

13. The wireless communication mobile station as in claim 12, wherein when executing the instructions, the vertically sorting of the pure power savings classes based on key parameters includes:

determining the maximum latency for each proposed member of the pure power savings class;

determining when one or more of the maximum latencies for all proposed members of the pure power savings class are equal or integer multiples of each other;

determining a smallest maximum latency; and

using the smallest maximum latency to determine a sleep window and a listening window.

14. The wireless communication mobile station as in claim 13, wherein when executing the instructions, the vertically sorting of the pure power savings classes based on key parameters further includes:

determining if a tolerated jitter is defined for one or more of the members of the pure power savings class;

determining if a longest tolerated jitter is smaller than or equal to one-half of the smallest maximum latency for the proposed members of the pure power savings class; and

using, when the tolerated jitter is defined for all of the members of the pure power savings class and the tolerated jitter is smaller than or equal to one-half of the smallest maximum latency of the pure power savings class, the longest tolerated jitter as the listening window for the pure power savings class.

15. The wireless communication mobile station as in claim 14, wherein when executing the instructions, the attributing of a power savings window size to each power savings class includes:

determining, from the connection with the smallest maximum latency, the power savings window size for a UGS pure power savings class, by setting the listening window as the longest tolerated jitter, and setting the sleep window as the remainder of the smallest maximum latency after subtracting the longest tolerated jitter;

determining, from the length of the longest tolerated jitter, the power savings window size for a UGS hybrid power savings class without RT-VR, by setting the longest tolerated jitter equal to the listening window, and setting the sleep window equal to the remainder of the shortest unsolicited grant interval after subtracting the longest tolerated jitter;

determining, from the connection with the smallest maximum latency, the power savings window size for an ERT-VR pure power savings class, when all power savings class members have a tolerated jitter, by setting the listening window as the longest tolerated jitter, and setting the sleep window as the remainder of the smallest maximum latency after subtracting the longest tolerated jitter;

determining, from the connection with the smallest maximum latency, the power savings window size for the ERT-VR pure power savings class, when not all power savings class members have a tolerated jitter, by adding a number of frames needed to send a maximum rate of packets to a bandwidth request frame to determine the listening window, and setting the sleep window as the remainder of the smallest maximum latency after subtracting the listening window;

determining, from utilizing a minimum reserved traffic rate, the power savings window size for an RT-VR pure power savings class, by adding a number of frames needed for uplink service to a bandwidth request frame to determine the listening window and setting the sleep window as the remainder of the unsolicited polling interval after subtracting the listening window;

determining, from the tolerated jitter size and the number of frames needed to send a packet, from utilizing the minimum reserved traffic rate, the power savings window size for an RT-VR hybrid power savings class to determine the listening window;

determining, from a bandwidth contention capacity, the power savings window size for an NRT-VR power savings class to initialize the sleep window;

determining, from a-bandwidth contention capacity, the power savings window size for a BE power savings class to initialize the sleep window; and

determining, from the minimum of a next frame offset time and a next periodic ranging time, the power savings window size for a multicast and management connections power savings class to determine the sleep window.

16. The wireless communication mobile station as in claim 9, wherein the connections includes QoS classes of UGS, ERT-VR, RT-VR, NRT-VR, BE, and multicast and management connections, where UGS, ERT-VR, RT-VR are real-time connections and NRT-VR and BE are non-real-time connections.

17. A computer-readable medium including instructions for performing a method, when executed by a processor, for power savings in a wireless communications network, the method comprising:

determining a number and type of connections;

selecting one or more of the connections with common performance characteristics to create a plurality of power savings classes;

attributing a power savings window size to each power savings class;

aligning power savings classes, with a same start time, to generate an aligned power savings class; and

communicating the plurality of power savings classes and each associated power savings window size to a base station.

18. The computer-readable medium as in claim 17, wherein the at least one processor is further configured to execute instructions including:

monitoring a threshold communications inactivity period;

determining if the threshold communications inactivity period exceeds a threshold; and

initiating the selecting and the attributing when the threshold communications inactivity period exceeds the threshold.

19. The computer-readable medium as in claim 17, wherein selecting connections with common performance characteristics includes:

sorting connections by real-time connections or non-real-time connections;

horizontally sorting the real-time connections into hybrid power savings classes and pure power savings classes, including;

grouping the hybrid power savings classes based on key parameters, including;

determining a maximum latency for each proposed member of the hybrid power savings class;

determining one of a polling interval or a grant interval for each proposed member of the hybrid power savings class;

determining when one or more of the maximum latencies for all proposed members of the hybrid power savings class are equal;

determining when one or more of the polling intervals or the grant intervals for all proposed members of the hybrid power savings class are equal or integer multiples of each other; and

including the proposed member in the hybrid power savings class when the maximum latencies are equal and all polling intervals and grant intervals are equal or integer multiples of each other;

vertically sorting pure power savings classes based on key parameters, including;

determining the maximum latency for each proposed member of the pure power savings class;

determining when one or more of the maximum latencies for all proposed members of the pure power savings class are equal or integer multiples of each other;

determining a smallest maximum latency; and

using the smallest maximum latency to determine a sleep window and a listening window;

vertically sorting the non-real-time connections into vertical non-real-time power savings classes, including;

horizontally sorting the vertical non-real-time power savings classes based on an urgency bit to create two non-real-time power savings classes.

20. The computer-readable medium as in claim 19, wherein vertically sorting the pure power savings classes based on key parameters further includes:

determining if a tolerated jitter is defined for one or more of the members of the pure power savings class;

determining if a longest tolerated jitter is smaller than or equal to one-half of the smallest maximum latency for the proposed members of the pure power savings class; and

using, when the tolerated jitter is defined for all of the members of the pure power savings class and the tolerated jitter is smaller than or equal to one-half of the smallest maximum latency of the pure power savings class, the longest tolerated jitter as the listening window for the pure power savings class.

21. The computer-readable medium as in claim 20, wherein the attributing of a power savings window size to each power savings class includes:

determining, from the connection with a smallest maximum latency, the power savings window size for a UGS pure power savings class, by setting the listening window as the longest tolerated jitter, and setting the sleep window as the remainder of the smallest maximum latency after subtracting the longest tolerated jitter;

determining, from the length of the longest tolerated jitter, the power savings window size for a UGS hybrid power savings class without RT-VR, by setting the longest tolerated jitter equal to the listening window, and setting the sleep window equal to the remainder of the shortest unsolicited grant interval after subtracting the longest tolerated jitter;

determining, from the connection with the smallest maximum latency, the power savings window size for an ERT-VR pure power savings class, when all power savings class members have a tolerated jitter, by setting the listening window as the longest tolerated jitter, and setting the sleep window as the remainder of the smallest maximum latency after subtracting the longest tolerated jitter;

determining, from the connection with the smallest maximum latency, the power savings window size for the ERT-VR pure power savings class, when not all power savings class members have a tolerated jitter, by adding a number of frames needed to send a maximum rate of packets to a bandwidth request frame to determine the listening window, and setting the sleep window as the remainder of the smallest maximum latency after subtracting the listening window;

determining, from utilizing a minimum reserved traffic rate, the power savings window size for an RT-VR pure power savings class, by adding a number of frames needed for uplink service to a bandwidth request frame to determine the listening window and setting the sleep window as the remainder of the smallest maximum latency after subtracting the listening window;

determining, from the tolerated jitter size and the number of frames needed to send a packet, from utilizing the minimum reserved traffic rate, the power savings window size for an RT-VR hybrid power savings class to determine the listening window;

determining, from a bandwidth contention capacity, the power savings window size for an NRT-VR power savings class to initialize the sleep window;

determining, from a bandwidth contention capacity, the power savings window size for a BE power savings class to initialize the sleep window; and

determining, from the minimum of a next frame offset time and a next periodic ranging time, the power savings window size for a multicast and management connections power savings class to determine the sleep window.

22. The computer-readable medium as in claim 17, wherein the connections includes QoS classes of UGS, ERT-VR, RT-VR, NRT-VR, BE, and multicast and management connections, where UGS, ERT-VR, RT-VR are real-time connections and NRT-VR and BE are non-real-time connections.