Control information for multi-user transmissions in WLAN systems
In wireless communications for multi-users, an access point may generate a first frame for allocating resources to a plurality of stations. The first frame may contain an indication as to whether a station(s) is allocated at least one of a set of resource units (RUs) of a plurality of RUs, such as a center 26-tone RU. The set of resource units may be based on a channel bandwidth of the wireless communications. The indication may be contained in a common block field of signal fields, such as a common block field of high efficiency (HE) signal content channel(s) of an HE signal field. The station(s) may receive the first frame and determine whether the one of the set of RUs is allocated. The station(s) may transmit a second frame to the access point based on resource allocation information in the first frame. Other methods, apparatus, and computer-readable media are also disclosed.
1. An access point for facilitating communication in a wireless network for a multi-user transmission, the access point comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors configured to cause:
generating a first frame for allocating resources to a plurality of stations, wherein the first frame comprises a first high efficiency signal-B (HE-SIG-B) field and a second HE-SIG-B field arranged in a plurality of content channels occupying respective subbands of a channel bandwidth, wherein the first HE-SIG-B field and the second HE-SIG-B field each contains an additional indication as to whether an additional resource unit of a plurality of resource units is allocated to at least one station of the plurality of stations when the channel bandwidth of the multi-user transmission is associated with a first channel bandwidth size, wherein the first frame excludes the additional indication when the channel bandwidth of the multi-user transmission is associated with a second channel bandwidth size that is less than the first channel bandwidth size; and
transmitting the first frame to the plurality of stations for the multi-user transmission,
wherein the additional resource unit consists of two of a plurality of tones being separated by a plurality of direct current (DC) tones,
wherein station specific information associated with the additional resource unit is located between a last station specific subfield of a plurality of station specific subfields and the end of at least one of the first HE-SIG-B field or the second HE-SIG-B field in a first content channel of the plurality of content channels, and
wherein the first HE-SIG-B field and the second HE-SIG-B field are concurrently transmitted in separate channels of the plurality of channels.
2. The access point of claim 1 , wherein the additional indication is contained within a common block field of the HE-SIG-B field.
3. The access point of claim 1 , wherein the additional resource unit is a center resource unit consisting of 26 tones.
4. The access point of claim 1 , wherein:
each of the first HE-SIG-B field and the second HE-SIG-B field is associated with a respective portion of the channel bandwidth.
5. The access point of claim 1 , wherein:
the first HE-SIG-B field comprises a common block field of the first content channel,
the second HE-SIG-B field comprises a common block field of a second content channel of the plurality of content channels, and
each of the common block field of the first content channel and the common block field of the second content channel contains the additional indication.
6. The access point of claim 1 , wherein, when the additional resource unit of the plurality of resource units is allocated, the one or more processors are further configured to cause:
determining, based on the channel bandwidth, which one of the first HE-SIG-B field or the second HE-SIG-B field to include the last station specific subfield associated with the additional resource unit that is allocated,
wherein the generating is based on the determining.
7. The access point of claim 1 , wherein the first channel bandwidth size is 80 MHz.
8. The access point of claim 1 , wherein the first frame contains type information of a plurality of station specific subfields.
9. The access point of claim 8 , wherein the type information of each of the plurality of station specific subfields is a single user allocation type or a multi-user allocation type.
10. The access point of claim 8 , wherein the type information is contained within a common block field of the HE-SIG-B field.
11. The access point of claim 1 , wherein each content channel of the plurality of content channels comprises a respective plurality of station specific subfields.
12. The access point of claim 1 , wherein at least two content channels of the plurality of content channels comprise different station specific information for different stations of the plurality of stations.
13. The access point of claim 1 , wherein each content channel of the plurality of content channels is associated with a different subband of the channel bandwidth.
14. A computer-implemented method of facilitating communication in a wireless network for a multi-user transmission, the computer-implemented method comprising:
receiving, at a first station, a first frame from a second station for allocating resources to a plurality of stations, wherein the first frame comprises a first high efficiency signal-B (HE-SIG-B) field and a second HE-SIG-B field arranged in a plurality of content channels occupying respective subbands of a channel bandwidth;
determining, based on an additional indication contained in at least one of the first HE-SIG-B field or the second HE-SIG-B field, whether an additional resource unit of a plurality of resource units is allocated to the first station when the channel bandwidth of the multi-user transmission is associated with a first channel bandwidth size, wherein the first frame excludes the additional indication when the channel bandwidth of the multi-user transmission is associated with a second channel bandwidth size that is less than the first channel bandwidth size, wherein the first frame comprises station specific information associated with the additional resource unit located between a last station specific subfield of a plurality of station specific subfields and the end of at least one of the first HE-SIG-B field or the second HE-SIG-B field when the additional resource unit is allocated; and
transmitting, for the multi-user transmission, a second frame using the additional resource unit when the additional resource unit is allocated to the first station,
wherein:
the first HE-SIG-B field is associated with a first content channel of the plurality of content channels, and the second HE-SIG-B field is associated with a second content channel of the plurality of content channels,
the additional resource unit consists of two of a plurality of tones being separated by a plurality of direct current (DC) tones, and
the first HE-SIG-B field and the second HE-SIG-B field are concurrently received in separate channels of the plurality of channels.
15. The computer-implemented method of claim 14 , wherein the additional indication is contained in each of the first HE-SIG-B field and the second HE-SIG-B field.
16. A station for facilitating communication in a wireless network for a multi-user transmission, the station comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors configured to cause:
receiving a first frame for allocating resources to a plurality of stations, wherein the first frame comprises a first high efficiency signal-B (HE-SIG-B) field and a second HE-SIG-B field arranged in a plurality of content channels occupying respective subbands of a channel bandwidth;
determining, based on an additional indication contained in at least one of the first HE-SIG-B field or the second HE-SIG-B field, whether an additional resource unit of a plurality of resource units is allocated to a station when the channel bandwidth of the multi-user transmission is associated with a first channel bandwidth size, wherein the first frame excludes the additional indication when the channel bandwidth of the multi-user transmission is associated with a second channel bandwidth size that is less than the first channel bandwidth size, wherein the first frame comprises station specific information associated with the additional resource unit that is located between a last station specific subfield of a plurality of station specific subfields and the end of at least one of the first HE-SIG-B field or the second HE-SIG-B field of a first content channel of the plurality of content channels when the additional resource unit is allocated; and
transmitting, for the multi-user transmission, a second frame using one or more of the plurality of resource units based on the first frame,
wherein the additional resource unit consists of two of a plurality of tones being separated by a plurality of direct current (DC) tones, and
wherein the first HE-SIG-B field and the second HE-SIG-B field are concurrently received in separate channels of the plurality of channels.
17. The station of claim 16 , wherein:
each of the first HE-SIG-B field and the second HE-SIG-B field is associated with a respective portion of the channel bandwidth.
18. The station of claim 16 , wherein at least one of the first HE-SIG-B field or the second HE-SIG-B field comprises a station specific subfield associated with the additional resource unit when the additional resource unit is allocated.
19. The station of claim 16 , wherein the one or more processors are further configured to cause:
determining, based on type information contained within a common block field of at least one of the first HE-SIG-B field or the second HE-SIG-B field, a type of a station specific subfield that is allocated to the station.
20. The station of claim 19 , wherein the type of the station specific subfield is a single user allocation type or a multi-user allocation type.