Ultra-low latency data transmission in WLANs
The application relates to ultra-low latency data transmission in Wireless Local Area Networks (WLANs). An apparatus used in a non-Access Point Station (non-AP STA), includes processor circuitry configured to cause the non-AP STA to, when there is urgent data that must be transmitted in uplink without waiting for a scheduled slot: generate a Protocol Data Unit (PDU) from the urgent data; and transmit the PDU on a resource unit pre-assigned for urgent transmission, wherein the resource unit is multiplexed for uplink transmission from multiple non-AP STAs.
1. An apparatus used in a non-Access Point Station (non-AP STA), comprising processor circuitry configured to cause the non-AP STA to, when there is urgent data that must be transmitted in uplink without waiting for a scheduled slot:
generate a Protocol Data Unit (PDU) from the urgent data; and
transmit the PDU on a resource unit pre-assigned for urgent transmission, wherein the resource unit is multiplexed for uplink transmission from multiple non-AP STAs,
wherein in a Short Interframe Space (SIFS) between a data frame and an acknowledgement frame responsive to the data frame of ongoing Orthogonal Frequency Division Multiplexing (OFDM) two-way transmission between another non-AP STA and an AP STA, the PDU is transmitted on frequency domain resources for the ongoing OFDM two-way transmission between the another non-AP STA and the AP STA.
2. The apparatus of claim 1 , wherein the PDU is transmitted upon receiving a trigger frame.
3. The apparatus of claim 1 , wherein the PDU is transmitted by randomly accessing the resource unit.
4. The apparatus of claim 1 , wherein in a preemption gap of ongoing Orthogonal Frequency Division Multiplexing (OFDM) uplink transmission of the non-AP STA, the PDU is transmitted on frequency domain resources for the ongoing OFDM uplink transmission of the non-AP STA.
5. The apparatus of claim 1 , wherein the processor circuitry is further configured to cause the non-AP STA to, in a blank symbol of ongoing Orthogonal Frequency Division Multiplexing (OFDM) uplink transmission of the non-AP STA:
transmit a signature sequence pre-assigned for the non-AP STA on frequency domain resources for the ongoing OFDM uplink transmission of the non-AP STA, wherein the signature sequence is used to request for a trigger frame to trigger transmitting of the PDU.
6. The apparatus of claim 5 , wherein the signature sequence is multiplexed with one or more bits of data to indicate a requested bandwidth for transmitting the PDU.
7. The apparatus of claim 1 , wherein in one or more pre-specified symbols of ongoing Orthogonal Frequency Division Multiplexing (OFDM) uplink transmission of the non-AP STA, the PDU is transmitted on frequency domain resources for the ongoing OFDM uplink transmission of the non-AP STA.
8. The apparatus of claim 1 , wherein during ongoing Orthogonal Frequency Division Multiplexing (OFDM) uplink transmission of the non-AP STA, the PDU is transmitted on frequency domain resources different from those for the ongoing OFDM uplink transmission of the non-AP STA.
9. The apparatus of claim 1 , wherein the PDU is transmitted by using Non-Orthogonal Multiple Access (NOMA) technique.
10. The apparatus of claim 9 , wherein the non-AP STA is a member of a NOMA group, which comprises more than one non-AP STAs and has a NOMA group identifier, and the resource unit is pre-allocated to the non-AP STA based on the NOMA group identifier.
11. A computer readable storage medium storing instructions thereon, the instructions, when executed by one or more processors, cause the one or more processors to, when a non-Access Point Station (non-AP STA) has urgent data that must be transmitted in uplink without waiting for a scheduled slot:
generate a Protocol Data Unit (PDU) from the urgent data; and
provide the PDU to a wireless interface for transmitting on a resource unit pre-assigned for urgent transmission, wherein the resource unit is multiplexed for uplink transmission from multiple non-AP STAs,
wherein in a Short Interframe Space (SIFS) between a data frame and an acknowledgement frame responsive to the data frame of ongoing Orthogonal Frequency Division Multiplexing (OFDM) two-way transmission between another non-AP STA and an AP STA, the PDU is transmitted on frequency domain resources for the ongoing OFDM two-way transmission between the another non-AP STA and the AP STA.
12. The computer readable storage medium of claim 11 , wherein the PDU is transmitted upon receiving a trigger frame.
13. The computer readable storage medium of claim 11 , wherein the PDU is transmitted by randomly accessing the resource unit.
14. The computer readable storage medium of claim 11 , wherein in a preemption gap of ongoing Orthogonal Frequency Division Multiplexing (OFDM) uplink transmission of the non-AP STA, the PDU is transmitted on frequency domain resources for the ongoing OFDM uplink transmission of the non-AP STA.
15. The computer readable storage medium of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the one or more processors to, in a blank symbol of ongoing Orthogonal Frequency Division Multiplexing (OFDM) uplink transmission of the non-AP STA:
provide a signature sequence pre-assigned for the non-AP STA to the wireless interface for transmitting on frequency domain resources for the ongoing OFDM uplink transmission of the non-AP STA, wherein the signature sequence is used to request for a trigger frame to trigger transmitting of the PDU.
16. The computer readable storage medium of claim 15 , wherein the signature sequence is multiplexed with one or more bits of data to indicate a requested bandwidth for transmitting the PDU.
17. The computer readable storage medium of claim 11 , wherein in one or more pre-specified symbols of ongoing Orthogonal Frequency Division Multiplexing (OFDM) uplink transmission of the non-AP STA, the PDU is transmitted on frequency domain resources for the ongoing OFDM uplink transmission of the non-AP STA.
18. The computer readable storage medium of claim 11 , wherein during ongoing Orthogonal Frequency Division Multiplexing (OFDM) uplink transmission of the non-AP STA, the PDU is transmitted on frequency domain resources different from those for the ongoing OFDM uplink transmission of the non-AP STA.
19. The computer readable storage medium of claim 11 , wherein the PDU is transmitted by using Non-Orthogonal Multiple Access (NOMA) technique.
20. The computer readable storage medium of claim 19 , wherein the non-AP STA is a member of a NOMA group, which comprises more than one non-AP STAs and has a NOMA group identifier, and the resource unit is pre-allocated to the non-AP STA based on the NOMA group identifier.
21. A non-Access Point Station (non-AP STA), comprising:
a wireless interface; and
processor circuitry coupled to the wireless interface and configured to, when there is urgent data that must be transmitted in uplink without waiting for a scheduled slot;
generate a Protocol Data Unit (PDU) from the urgent data; and
provide the PDU to the wireless interface for transmitting on a resource unit pre-assigned for urgent transmission, wherein the resource unit is multiplexed for uplink transmission from multiple non-AP STAs,
wherein in a Short Interframe Space (SIFS) between a data frame and an acknowledgement frame responsive to the data frame of ongoing Orthogonal Frequency Division Multiplexing (OFDM) two-way transmission between another non-AP STA and an AP STA, the PDU is transmitted on frequency domain resources for the ongoing OFDM two-way transmission between the another non-AP STA and the AP STA.
22. The non-AP STA of claim 21 , wherein the PDU is transmitted upon receiving a trigger frame.
23. The non-AP STA of claim 21 , wherein the PDU is transmitted by randomly accessing the resource unit.