Session recovery after network coordinator or AP restart for single user, multiple user, multiple access, and/or MIMO wireless communications
View Patent ↗Session recovery after network coordinator or AP restart for single user, multiple user, multiple access, and/or MIMO wireless communications. Restart or reset of a network coordinator (e.g., an access point (AP) or other network coordinator type device) may occur for various reasons (e.g., a power cycle or power failure, inadequate failover protection, scheduled or planned power outages such as for including network maintenance, software upgrades, etc.). Upon determination of network coordinator restarted or reset, a singular bit within a communication from the network coordinator indicates synchronization or not of the its timing synchronization function (TSF) (e.g., with other devices in the communication system, such as wireless stations (STAs), smart meter stations (SMSTAs), etc.). A given device (e.g., STA, SMSTA, etc.) can provide its current TSF to the network coordinator so that it can resynchronize, re-establish its scheduled for wake times of those devices (e.g., target wake times (TWTs)), etc.
1. A wireless communication device comprising:
a communication interface; and
a processor, at least one of the processor or the communication interface configured to:
transmit a first target wake time (TWT) to another wireless communication device to direct the another wireless communication device to awaken from a power savings mode based on the first TWT;
undergo a restart or a reset;
generate a signal that includes information that specifies that the wireless communication device has undergone the restart or the reset and that includes a timing synchronization function (TSF) value request;
transmit the signal to the another wireless communication device to be processed by the another wireless communication device to determine that the wireless communication device has undergone the restart or the reset;
receive, from the another wireless communication device and in response to the signal, another signal that includes a TSF value;
modify a TSF timer of the wireless communication device based on the TSF value; and
transmit a second TWT to the another wireless communication device to direct the another wireless communication device to awaken from the power savings mode based on the second TWT.
2. The wireless communication device of claim 1 , wherein the at least one of the processor or the communication interface is further configured to:
transmit another TWT to the another wireless communication device to direct the another wireless communication device to awaken from the power savings mode based on the second TWT.
3. The wireless communication device of claim 1 further comprising:
an access point (AP), wherein the another wireless communication device includes a smart meter station (SMSTA).
4. The wireless communication device of claim 1 , wherein the at least one of the processor or the communication interface is further configured to:
generate the signal that includes the information that includes the TSF value request, wherein the TSF value request includes a singular bit set to a predetermined value.
5. The wireless communication device of claim 1 , wherein the at least one of the processor or the communication interface is further configured to:
generate the signal that includes a restart count value that specifies that the wireless communication device has undergone the restart or the reset.
6. The wireless communication device of claim 1 , wherein the at least one of the processor or the communication interface is further configured to:
transmit the signal to a plurality of other wireless communication device;
receive, from at least one wireless communication device of the plurality of other wireless communication device, at least one other signal that includes at least one other TSF value; and
modify the TSF timer of the wireless communication device based on the at least one other TSF value.
7. The wireless communication device of claim 1 further comprising:
a laptop host computer, a personal digital assistant, a personal computer, or a cellular telephone.
8. The wireless communication device of claim 1 further comprising:
an access point (AP), wherein the another wireless communication device includes a wireless station (STA).
9. A wireless communication device comprising:
a communication interface; and
a processor, at least one of the processor or the communication interface configured to:
transmit a first target wake time (TWT) to another wireless communication device to direct the another wireless communication device to awaken from a power savings mode based on the first TWT;
generate a first signal that includes a first timing synchronization function (TSF) value that corresponds to a TSF timer of the wireless communication device;
transmit the first signal to the another wireless communication device;
undergo a restart or a reset;
generate a second signal that includes a second TSF value that corresponds to the TSF timer of the wireless communication device after the restart or the reset, wherein the second signal includes information that specifies that that the wireless communication device has undergone the restart or the reset;
transmit the second signal to the another wireless communication device;
receive, from the another wireless communication device and in response to the second signal, a third signal that includes a third TSF value;
modify the TSF timer of the wireless communication device based on the third TSF value; and
transmit a second TWT to the another wireless communication device to direct the another wireless communication device to awaken from the power savings mode based on the second TWT.
10. The wireless communication device of claim 9 further comprising:
a laptop host computer, a personal digital assistant, a personal computer, or a cellular telephone.
11. The wireless communication device of claim 9 , wherein the at least one of the processor or the communication interface is further configured to:
generate the second signal that includes a restart count value that specifies that the wireless communication device has undergone the restart or the reset.
12. The wireless communication device of claim 9 , wherein the at least one of the processor or the communication interface is further configured to:
receive, from at least one other wireless communication device, at least one other signal that includes at least one other TSF value; and
modify the TSF timer of the wireless communication device based on the at least one other TSF value.
13. The wireless communication device of claim 9 further comprising:
an access point (AP), wherein the another wireless communication device includes a wireless station (STA).
14. A method for execution by a wireless communication device, the method comprising:
transmitting, via a communication interface of the wireless communication device, a first target wake time (TWT) to another wireless communication device to direct the another wireless communication device to awaken from a power savings mode based on the first TWT;
undergoing a restart or a reset;
generating a signal that includes information that specifies that the wireless communication device has undergone the restart or the reset and that includes a timing synchronization function (TSF) value request;
transmitting, via the communication interface of the wireless communication device, the signal to another wireless communication device to be processed by the another wireless communication device to determine that the wireless communication device has undergone the restart or the reset;
receiving, via the communication interface of the wireless communication device and from the another wireless communication device and in response to the signal, another signal that includes a TSF value;
modifying a TSF timer of the wireless communication device based on the TSF value; and
transmitting, via the communication interface of the wireless communication device, a second TWT to the another wireless communication device to direct the another wireless communication device to awaken from the power savings mode based on the second TWT.
15. The method of claim 14 further comprising:
transmitting, via the communication interface of the wireless communication device, another TWT to the another wireless communication device to direct the another wireless communication device to awaken from the power savings mode based on the second TWT.
16. The method of claim 14 , wherein the wireless communication device includes a laptop host computer, a personal digital assistant, a personal computer, or a cellular telephone.
17. The method of claim 14 further comprising:
generating the signal that includes the information that includes the TSF value request, wherein the TSF value request includes a singular bit set to a predetermined value.
18. The method of claim 14 further comprising:
generating the signal that includes a restart count value that specifies that the wireless communication device has undergone the restart or the reset.
19. The method of claim 14 further comprising:
transmitting, via the communication interface of the wireless communication device, the signal to a plurality of other wireless communication device;
receiving, via the communication interface of the wireless communication device, from at least one wireless communication device of the plurality of other wireless communication device, at least one other signal that includes at least one other TSF value; and
modifying the TSF timer of the wireless communication device based on the at least one other TSF value.
20. The method of claim 14 , wherein the wireless communication device includes an access point (AP), wherein the another wireless communication device includes a wireless station (STA).