Techniques for non-simultaneous transmit and receive station operation during synchronization procedures
This disclosure provides methods, devices and systems for non-simultaneous transmit and receive (STR) station (STA) transmissions using multiple links. In one aspect, a medium synchronization delay timer associated with a second link of the non-STR STA can be initiated in response to completing transmission of the data on the first link to delay triggering of a clear channel assessment (CCA) associated with the second link. Data can be transmitted on the second link in response to expiration of the medium synchronization delay timer. In another aspect, an energy detect (ED) threshold level on a second link may be decreased from a first ED threshold level to a second ED threshold level after transmitting the data on the first link. In a further aspect, a block acknowledgment (BA) frame including a network allocation vector (NAV) synchronization of a second access point may be transmitted to the first link of the station.
1. A method of communications, comprising:
transmitting data on a first link of a non-simultaneous transmit and receive (STR) station (STA) configured to communicate using multiple links;
initiating a medium synchronization delay timer after completing transmission of the data on the first link, the medium synchronization delay timer associated with a second link of the non-STR STA;
initiating a second transmission on the first link while the medium synchronization delay timer is active;
re-initiating the medium synchronization delay timer in response to completion of the second transmission on the first link; and
transmitting data on the second link based on the medium synchronization delay timer.
2. The method of claim 1 , wherein the transmission of the data on the first link interferes with a reception of signaling on the second link.
3. The method of claim 1 , wherein a first frequency of the first link is within an interfering frequency range of a second frequency of the second link.
4. The method of claim 1 , wherein the medium synchronization delay timer expires after a medium synchronization delay time duration has elapsed.
5. The method of claim 1 , further comprising:
determining whether a channel detection condition has been satisfied; and
terminating the medium synchronization delay timer based on determining that the channel detection condition has been satisfied.
6. The method of claim 5 , wherein the channel detection condition corresponds to at least one of:
reception of a physical layer (PHY) protocol data unit (PPDU) associated with a valid medium access control PDU (MPDU),
reception of a PPDU having a valid transmission opportunity duration,
a decoding of a preamble, or
completion of a network allocation vector (NAV) synchronization procedure.
7. The method of claim 1 , further comprising:
receiving a block acknowledgment (BA) from an access point (AP) on the first link, the BA includes a network allocation vector (NAV) synchronization of a second AP; and
adjusting a NAV synchronization procedure of the second link based on the received BA.
8. The method of claim 1 , further comprising:
initiating a second medium synchronization delay timer associated with a third link of the non-STR STA in response to completing transmission of the data on the first link;
triggering a clear channel assessment (CCA) countdown timer associated with the third link in response to expiration of the second medium synchronization delay timer; and
transmitting data on the third link in response to expiration of the CCA countdown timer.
9. The method of claim 8 , wherein the transmission of the data on the first link interferes with a reception of signaling on both the second link and the third link.
10. The method of claim 8 , wherein a first frequency of the first link is within an interfering frequency range of both a second frequency of the second link and a third frequency of the third link.
11. The method of claim 1 , further comprising:
adjusting an energy detect (ED) threshold level on a second link from a first energy detect (ED) threshold level to a second energy detect (ED) threshold level after transmitting the data on the first link;
triggering a clear channel assessment (CCA) countdown timer associated with the second link; and
transmitting data on the second link.
12. The method of claim 11 , wherein the ED threshold level is decreased immediately after a completion of the transmission of the data on the first link.
13. The method of claim 11 , further comprising increasing the ED threshold level from the second ED threshold level to the first ED threshold level after initiating transmission of the data on the second link.
14. The method of claim 1 , further comprising triggering a clear channel assessment (CCA) countdown timer associated with the second link in response to expiration of the medium synchronization delay timer,
wherein the medium synchronization delay timer prevents initiation of the CCA countdown timer for the second link following completion of the transmission of the data on the first link.
15. The method of claim 1 , wherein the medium synchronization delay timer is initiated in response to completing transmission of the data on the first link.
16. The method of claim 1 , further comprising:
terminating the medium synchronization delay timer in response to the second transmission on the first link occurring while the medium synchronization delay timer is active.
17. The method of claim 1 , wherein transmitting the data on the second link comprises:
transmitting the data on the second link after an expiration of the medium synchronization delay timer.
18. An apparatus for communications, comprising:
a memory; and
a processor in communication with the memory and configured to:
transmit data on a first link of a non-simultaneous transmit and receive (STR) station (STA) configured to communicate use multiple links;
initiate a medium synchronization delay timer after completing transmission of the data on the first link, the medium synchronization delay timer associated with a second link of the non-STR STA;
initiate a second transmission on the first link while the medium synchronization delay timer is active;
re-initiate the medium synchronization delay timer in response to completion of the second transmission on the first link; and
transmit data on the second link based on the medium synchronization delay timer.
19. The apparatus of claim 18 , wherein the transmission of the data on the first link interferes with a reception of signaling on the second link.
20. The apparatus of claim 18 , wherein a first frequency of the first link is within an interfering frequency range of a second frequency of the second link.
21. The apparatus of claim 18 , wherein the medium synchronization delay timer expires after a medium synchronization delay time duration has elapsed.
22. The apparatus of claim 18 , wherein the processor is further configured to:
determine whether a channel detection condition has been satisfied; and
terminate the medium synchronization delay timer based on determining that the channel detection condition has been satisfied.
23. The apparatus of claim 22 , wherein the channel detection condition corresponds to at least one of:
reception of a physical layer (PHY) protocol data unit (PPDU) associated with a valid medium access control PDU (MPDU),
reception of a PPDU having a valid transmission opportunity duration,
a decoding of a preamble, or
completion of a network allocation vector (NAV) synchronization procedure.
24. The apparatus of claim 18 , wherein the processor is further configured to:
receive a block acknowledgment (BA) from an access point (AP) on the first link, the BA includes a network allocation vector (NAV) synchronization of a second AP; and
adjust a NAV synchronization procedure of the second link based on the received BA.
25. The apparatus of claim 18 , wherein the processor is further configured to:
initiate a second medium synchronization delay timer associated with a third link of the non-STR STA in response to complete transmission of the data on the first link;
trigger a clear channel assessment (CCA) countdown timer associated with the third link in response to expiration of the second medium synchronization delay timer; and
transmit data on the third link in response to expiration of the CCA countdown timer.
26. The apparatus of claim 25 , wherein the transmission of the data on the first link interferes with a reception of signaling on both the second link and the third link.
27. The apparatus of claim 25 , wherein a first frequency of the first link is within an interfering frequency range of both a second frequency of the second link and a third frequency of the third link.
28. An apparatus for communications, comprising:
means for transmitting data on a first link of a non-simultaneous transmit and receive (STR) station (STA) configured to communicate use multiple links;
means for initiating a medium synchronization delay timer after completing transmission of the data on the first link, the medium synchronization delay timer associated with a second link of the non-STR STA;
means for initiating a second transmission on the first link while the medium synchronization delay timer is active;
means for re-initiating the medium synchronization delay timer in response to completion of the second transmission on the first link; and
means for transmitting data on the second link based on the medium synchronization delay timer.
29. A non-transitory computer-readable medium comprising stored instructions of communications, executable by a processor to:
transmit data on a first link of a non-simultaneous transmit and receive (STR) station (STA) configured to communicate use multiple links;
initiate a medium synchronization delay timer after completing transmission of the data on the first link, the medium synchronization delay timer associated with a second link of the non-STR STA;
initiate a second transmission on the first link while the medium synchronization delay timer is active;
re-initiate the medium synchronization delay timer in response to completion of the second transmission on the first link; and
transmit data on the second link based on the medium synchronization delay timer.