SDMA multi-device wireless communications
The present disclosure includes systems and techniques relating to wireless communications. A described system, for example, includes a device configured to transmit signals, in a frequency band, to the wireless communication devices. The signals can include spatially steered first signals that concurrently provide data to the wireless communication devices. The signals can include one or more second signals to the wireless communication devices to control transmission of responses from the wireless communication devices in the frequency band. The device can monitor for the responses in the frequency band. The device can control, based on a lack of reception of an expected response, a transmission of a third signal in the frequency band to prevent a transmission from another wireless communication device different than the wireless communication devices. The third signal can include information to reschedule a transmission of a response from a wireless communication device.
1. A method, comprising:
transmitting, in a frequency band, information to wireless communication devices, including a first device and a second device, that participate in a space division multiple access based communication, wherein the transmitting comprises (i) transmitting spatially steered first signals that form the space division multiple access based communication and concurrently provide data to the wireless communication devices, and (ii) transmitting one or more second signals to the wireless communication devices to control transmission of acknowledgements from the wireless communication devices in the frequency band, wherein the acknowledgements indicate a successful reception of a respective portion of the data;
monitoring for the acknowledgements in the frequency band, wherein monitoring for the acknowledgements in the frequency band comprises detecting a lack of reception of an expected acknowledgement from the first device based on an end of a point coordination function (PCF) interframe space (PIFS) duration after an end of the spatially steered first signals; and
selectively transmitting, based on the lack of reception of the expected acknowledgement and the end of the PIFS duration, a third signal in the frequency band to prevent a transmission from a wireless communication device that is not participating in the space division multiple access based communication, wherein selectively transmitting the third signal comprises transmitting information to control a transmission of a response from at least one of the wireless communication devices.
2. The method of claim 1 , wherein the first device is originally scheduled to send an immediate acknowledgement after the end of the spatially steered first signals, and wherein the third signal comprises a block acknowledgment request.
3. The method of claim 1 , wherein transmitting the one or more second signals comprises:
transmitting first response scheduling information to cause the first device to transmit an acknowledgement during a first portion of an acknowledgement period; and
transmitting second response scheduling information to cause the second devices to transmit an acknowledgement during a second, subsequent portion of the acknowledgement period.
4. The method of claim 3 , further comprising:
controlling the wireless communication devices to perform reachability testing, wherein the reachability testing comprises determining whether a signal emanating from the first device is at least received by the second device; and
generating an acknowledgement response schedule based on the reachability testing,
wherein the first and second response scheduling information are based on the acknowledgement response schedule.
5. The method of claim 1 , wherein transmitting the one or more second signals comprises transmitting a block acknowledgment request to at least one of the wireless communication devices.
6. The method of claim 1 , wherein transmitting the one or more second signals comprises transmitting an aggregated block acknowledgment request to the wireless communication devices, wherein the aggregated block acknowledgment request comprises (i) a first indication of an acknowledgement response time for the first device and (ii) a second indication of a subsequent acknowledgement response time for the second device.
7. The method of claim 1 , wherein transmitting the spatially steered first signals comprises:
transmitting a first packet data unit (PDU) of a medium access control (MAC) layer to the first device via a first spatial wireless channel, wherein the first PDU comprises first information that causes the first device to selectively transmit an acknowledgement in a first period; and
transmitting a second PDU of the MAC layer to the second device via a second spatial wireless channel, wherein the second PDU comprises second information that causes the second device to selectively transmit an acknowledgement in a second period that is subsequent to the first period.
8. The method of claim 1 , wherein transmitting the one or more second signals comprises:
transmitting, via a first spatial wireless channel, a signaling field in a physical layer to signal a first acknowledgement response time for the first device; and
transmitting, via a second spatial wireless channel, a signaling field in a physical layer to signal a second, subsequent acknowledgement response time for the second device.
9. The method of claim 1 , wherein transmitting the spatially steered first signals comprises: transmitting space division multiple access frames to the wireless communication devices, wherein at least one of the frames includes padding, wherein an amount of the padding is based on a maximum length that is determined by lengths of the frames.
10. An apparatus, comprising:
circuitry to transmit, in a frequency band, signals to wireless communication devices, including a first device and a second device, that participate in a space division multiple access based communication, wherein the signals include (i) spatially steered first signals that form the space division multiple access based communication and concurrently provide data to the wireless communication devices, and (ii) one or more second signals to the wireless communication devices to control transmission of acknowledgements from the wireless communication devices in the frequency band, wherein the acknowledgements indicate a successful reception of a respective portion of the data;
circuitry to monitor for the acknowledgements in the frequency band and detect a lack of reception of an expected acknowledgement from the first device based on an end of a point coordination function (PCF) interframe space (PIFS) duration after an end of the spatially steered first signals; and
circuitry to selectively transmit, based on the lack of reception of the expected acknowledgement and the end of the PIFS duration, a third signal in the frequency band to prevent a transmission from a wireless communication device that is not participating in the space division multiple access based communication, wherein the third signal comprises information to control a transmission of a response from at least one of the wireless communication devices.
11. The apparatus of claim 10 , wherein the first device is originally scheduled to send an immediate acknowledgement after the end of the spatially steered first signals, and wherein the third signal comprises a block acknowledgment request.
12. The apparatus of claim 10 , wherein the one or more second signals collectively include (i) first response scheduling information to cause the first device to transmit an acknowledgement during a first portion of an acknowledgement period and (ii) second response scheduling information to cause the second device to transmit an acknowledgement during a second, subsequent portion of the acknowledgement period.
13. The apparatus of claim 12 , further comprising:
circuitry to control the wireless communication devices to perform reachability testing, wherein the reachability testing comprises determining whether a signal emanating from the first device is at least received by the second device; and
circuitry to generate an acknowledgement response schedule based on the reachability testing,
wherein the first and second response scheduling information are based on the acknowledgement response schedule.
14. The apparatus of claim 10 , wherein the one or more second signals is indicative of a block acknowledgment request to at least one of the wireless communication devices.
15. The apparatus of claim 10 , wherein the one or more second signals are indicative of an aggregated block acknowledgment request to the wireless communication devices, wherein the aggregated block acknowledgment request comprises (i) a first indication of an acknowledgement response time for the first device and (ii) a second indication of a subsequent acknowledgement response time for the second device.
16. The apparatus of claim 10 , wherein the spatially steered first signals collectively includes (i) a first packet data unit (PDU) of a medium access control (MAC) layer to the first device via a first spatial wireless channel and (ii) a second PDU of the MAC layer to the second device via a second spatial wireless channel, wherein the first PDU comprises first information that causes the first device to selectively transmit an acknowledgement in a first period, and wherein the second PDU comprises second information that causes the second device to selectively transmit an acknowledgement in a second period that is subsequent to the first period.
17. The apparatus of claim 10 , wherein the circuitry to transmit signals to wireless communication devices comprises:
circuitry to transmit, via a first spatial wireless channel, a signaling field in a physical layer to signal a first acknowledgement response time the first device; and
circuitry to transmit, via a second spatial wireless channel, a signaling field in a physical layer to signal a second, subsequent acknowledgement response time for the second device.
18. The apparatus of claim 10 , wherein the circuitry to transmit signals to wireless communication devices comprises circuitry to transmit space division multiple access frames to the wireless communication devices, wherein at least one of the frames includes padding, wherein an amount of the padding is based on a maximum length that is determined by lengths of the frames.
19. A system, comprising:
circuitry to communicate with two or more wireless communication devices, including a first device and a second device, that participate in a space division multiple access based communication; and
processor electronics configured to (i) control the transmission of signals, in a frequency band, to the wireless communication devices, wherein the signals include spatially steered first signals that form the space division multiple access based communication and concurrently provide data to the wireless communication devices, and one or more second signals to the wireless communication devices to control transmission of responses from the wireless communication devices in the frequency band, (ii) monitor for the responses in the frequency band detect a lack of reception of an expected response from the first device based on an end of a duration after an end of the spatially steered first signals; and (iii) control, based on the lack of reception of the expected response and the end of the duration, a transmission of a third signal in the frequency band to prevent a transmission from a wireless communication device that is not participating in the space division multiple access based communication, wherein the first device is scheduled to send an immediate acknowledgement after the end of the spatially steered first signals, and wherein the third signal comprises information to control a transmission of a response from the second device.
20. The system of claim 19 , wherein the second device is originally scheduled to send an acknowledgement after the first device.
21. The system of claim 19 , wherein the one or more second signals include the third signal, and wherein the third signal comprises a block acknowledgment request to control the transmission of the response from the second device.