Master station and method for high-efficiency WI-FI (hew) communication using multi-device hew preamble
Embodiments of a master station and method for high-efficiency Wi-Fi (HEW) communication using a multi-device HEW preamble are generally described herein. In some embodiments, the master station may select a number of long-training fields (LTFs) to be included in the multi-device HEW preamble of an HEW frame. The HEW frame may comprise a plurality of links for transmission of a plurality of streams. The master station may transmit the selected number of LTFs sequentially as part of the HEW preamble and transmit a plurality of data fields to scheduled stations during an HEW control period. Each data field may correspond to one of the links and may comprise one or more streams. The selection of the number of LTFs to be included in the HEW preamble may be based on a maximum number of streams to be transmitted on a single link.
1. A master station arranged for communicating with a plurality of high-efficiency Wi-Fi (HEW) stations, the master station comprising:
processing circuitry configured to select a number of long-training fields (LTFs) to be included in a multi-device HEW preamble of an HEW frame; and
physical layer (PHY) circuitry configured to:
transmit, within an HEW control period, the selected number of LTFs sequentially as part of the HEW preamble; and
transmit, within the HEW control period, a plurality of data fields sequentially to each of a plurality of scheduled HEW stations, the data fields being part of the HEW frame, each data field corresponding to one link and comprising one or more streams.
2. The master station of claim 1 wherein the selection of the number of LTFs to be included in the HEW preamble is based on a maximum number of streams to be transmitted on a single link.
3. The master station of claim 1 wherein the master station includes a medium-access control (MAC) layer circuitry arranged to configure the HEW preamble to:
include the number of LTFs in an LTF portion of the HEW preamble;
include an HEW control signal field (HEW-CNTR-SIG) to follow the LTF portion; and
configure the HEW frame to include a legacy preamble to precede the HEW preamble.
4. The master station of claim 3 wherein the HEW-CNTR-SIG is configured by the master station for signaling and identifying each of the links of the HEW frame.
5. The master station of claim 4 wherein the HEW-CNTR-SIG is configured to identify one or more of:
modulation parameters for each of the links;
an encoding type for each of the links;
whether each link is a single user (SU) link or a multi-user (MU) link; and
a number of streams for each link.
6. The master station of claim 4 wherein each data field is associated with either a single user (SU) link or a multi-user (MU) link, each link configurable to provide multiple streams of data.
7. The master station of claim 4 further arranged to provide an indication of the number of LTFs that are included in the LTF portion of the HEW preamble.
8. The master station of claim 7 wherein the indication of the number of LTFs that are included in the LTF portion of the HEW preamble is provided in the legacy preamble.
9. The master station of claim 4 wherein at least some of the LTFs that are included in the LTF portion of the HEW preamble are to be used by the scheduled HEW stations for channel estimation.
10. The master station of claim 2 wherein the links of the HEW frame are configurable to have a same bandwidth of one of 20 MHz, 40 MHz, 80 MHz or 160 MHz.
11. The master station of claim 2 further configured to:
contend for a wireless medium during a contention period to receive control of the medium for the HEW control period; and
transmit the HEW frame during the HEW control period, wherein during the HEW control period, the master station has exclusive use of the wireless medium for communication with the scheduled HEW stations in accordance with a non-contention based multiple-access technique.
12. A method performed by a master station for communicating with a plurality of high-efficiency Wi-Fi (HEW) stations, the method comprising:
selecting a number of long-training fields (LTFs) to be included in a multi-device HEW preamble of an HEW frame;
transmitting, during an HEW control period, the selected number of LTFs sequentially as part of the HEW preamble; and
transmitting, during the HEW control period, a plurality of data fields sequentially to each of a plurality of scheduled stations, the data fields being part of the HEW frame, each data field corresponding to one link and comprising one or more streams.
13. The method of claim 12 further comprising:
configuring the HEW preamble to include the number of LTFs in an LIT portion of the HEW preamble;
configuring the HEW preamble to include an HEW control signal field (HEW-CNTR-SIG) to follow the LIT portion; and
configuring the HEW frame to include a legacy preamble to precede the HEW preamble.
14. The method of claim 13 wherein the HEW-CNTR-SIG is configured by the master station for signaling and identifying each of the links of the HEW frame.
15. The method of claim 14 wherein the selection of the number of LTFs to be included in the HEW preamble is based on a maximum number of streams to be transmitted on a single link.
16. The method of claim 15 wherein each data field is associated with either a single user (SU) link or a multi-user (MU) link, each link configurable to provide multiple streams of data, and
wherein the links of the HEW frame are configurable to have a same bandwidth of one of 20 MHz, 40 MHz, 80 MHz or 160 MHz.
17. The method of claim 16 further comprising:
contending for a wireless medium during a contention period to receive control of the medium for the HEW control period; and
transmitting the HEW frame during the HEW control period, wherein during the HEW control period, the master station has exclusive use of the wireless medium for communication with the scheduled HEW stations in accordance with a non-contention based multiple-access technique.
18. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of a master station to perform operations for communicating with a plurality of high-efficiency Wi-Fi (HEW) stations, the operations comprising:
selecting a number of long-training fields (LTFs) to be included in a multi-device HEW preamble of an HEW frame;
transmitting, during an HEW control period, the selected number of LTFs sequentially as part of the HEW preamble; and
transmitting, during the HEW control period, a plurality of data fields sequentially to each of a plurality of scheduled stations, the data fields being part of the HEW frame, each data field corresponding to one link and comprising one or more streams.
19. The non-transitory computer-readable storage medium of claim 18 wherein the operations further comprise:
configuring the HEW preamble to include the number of LTFs in an LTF portion of the HEW preamble;
configuring the HEW preamble to include an HEW control signal field (HEW-CNTR-SIG) to follow the LTF portion; and
configuring the HEW frame to include a legacy preamble to precede the HEW preamble,
wherein the HEW-CNTR-SIG is configured by the master station for signaling and identifying each of the links of the HEW frame.
20. The non-transitory computer-readable storage medium of claim 18 wherein the operations further comprise selecting the number of LTFs to be included in the HEW preamble based on a maximum number of streams to be transmitted on a single link.