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. An apparatus comprising:
at least one communication interface configured to receive a first signal from an access point (AP); and
a processor configured to:
analyze the first signal to determine whether or not the AP has undergone a restart or reset;
determine whether or not the first signal includes a request for a timing synchronization function (TSF) value from the apparatus based on a singular bit within the first signal being set to a predetermined value; and
upon determination that the AP has undergone the restart or reset and upon determination that the first signal includes the request for the TSF value from the apparatus, generate a second signal that includes the TSF value from the apparatus; and wherein:
the at least one communication interface configured to transmit the second signal to the AP;
the apparatus being one wireless station (STA) of a plurality of wireless stations (STAs);
before the AP has undergone the restart or reset, the plurality of STAs configured to awaken respectively at a first plurality of target wake times (TWTs) in accordance with a first schedule; and
after the AP has undergone the restart or reset, the plurality of STAs configured to awaken respectively at a second plurality of TWTs in accordance with a second schedule.
2. The apparatus of claim 1 , wherein the processor is further configured to:
determine that the AP has undergone the restart or reset when a TSF value within the first signal is different than an expected TSF value.
3. The apparatus of claim 1 , wherein the processor is further configured to:
determine that the AP has undergone the restart or reset based on a restart count value within the first signal.
4. The apparatus of claim 1 , wherein the AP is further configured to:
generate the second schedule based on a time reference that is based on the TSF value received from the apparatus.
5. The apparatus of claim 1 , wherein the AP is further configured to:
reset or adjust a local TSF value therein based on the TSF value included within the second signal from the apparatus.
6. An apparatus comprising:
at least one communication interface configured to receive a first signal from at least one additional apparatus; and
a processor to:
analyze the first signal to determine whether or not the at least one additional apparatus has undergone a restart or reset and to determine whether or not the first signal includes a request for a timing synchronization function (TSF) value from the apparatus; and
upon determination that the at least one additional apparatus has undergone the restart or reset and upon determination that the first signal includes the request for the TSF value from the apparatus, generate a second signal that includes the TSF value from the apparatus; and
the at least one communication interface configured to transmit the second signal to the at least one additional apparatus.
7. The apparatus of claim 6 , wherein the processor is further configured to:
determine that the at least one additional apparatus has undergone the restart or reset when a TSF value within the first signal is different than an expected TSF value.
8. The apparatus of claim 6 , wherein the processor is further configured to:
determine that the at least one additional apparatus has undergone the restart or reset based on a restart count value within the first signal.
9. The apparatus of claim 6 , wherein the processor is further configured to:
determine that the first signal includes the request for the TSF value from the apparatus based on a singular bit within the first signal being set to a predetermined value.
10. The apparatus of claim 6 , wherein:
the apparatus being one wireless station (STA) of a plurality of wireless stations (STAs);
before the at least one additional apparatus has undergone the restart or reset, the plurality of STAs configured to awaken respectively at a first plurality of target wake times (TWTs) in accordance with a first schedule; and
after the at least one additional apparatus has undergone the restart or reset, the plurality of STAs configured to awaken respectively at a second plurality of TWTs in accordance with a second schedule.
11. The apparatus of claim 10 further comprising:
the at least one additional apparatus configured to generate the second schedule based on a time reference that is based on the TSF value received from the apparatus.
12. The apparatus of claim 6 further comprising:
the at least one additional apparatus configured to reset or adjust a local TSF value therein based on the TSF value included within the second signal from the apparatus.
13. The apparatus of claim 6 , wherein:
a wireless station (STA), wherein the at least one additional apparatus being an access point (AP).
14. A method for execution by a communication device, the method comprising:
operating at least one communication interface of the communication device to receive a first signal from at least one additional communication device;
analyzing the first signal to determine whether or not the at least one additional communication device has undergone a restart or reset and to determine whether or not the first signal includes a request for a timing synchronization function (TSF) value from the communication device; and
upon determination that the at least one additional communication device has undergone the restart or reset and upon determination that the first signal includes the request for the TSF value from the communication device:
generating a second signal that includes the TSF value from the communication device; and
operating at least one communication interface of the communication device to transmit the second signal to the at least one additional communication device.
15. The method of claim 14 further comprising:
determining that the at least one additional communication device has undergone the restart or reset when a TSF value within the first signal is different than an expected TSF value.
16. The method of claim 14 further comprising:
determining that the at least one additional communication device has undergone the restart or reset based on a restart count value within the first signal.
17. The method of claim 14 further comprising:
determining that the first signal includes the request for the TSF value from the communication device based on a singular bit within the first signal being set to a predetermined value.
18. The method of claim 14 , wherein:
the communication device being one wireless station (STA) of a plurality of wireless stations (STAs); and further comprising:
before the at least one additional communication device has undergone the restart or reset, the plurality of STAs operating by awakening respectively at a first plurality of target wake times (TWTs) in accordance with a first schedule; and
after the at least one additional communication device has undergone the restart or reset, the plurality of STAs operating by awakening respectively at a second plurality of TWTs in accordance with a second schedule.
19. The method of claim 14 further comprising:
the at least one additional communication device operating by resetting or adjusting a local TSF value therein based on the TSF value included within the second signal from the communication device.
20. The method of claim 14 , wherein
the communication device being a wireless station (STA), and
the at least one additional communication device being an access point (AP).