Feedback parameters required by link adaptation
Disclosed are methods, devices, and computer readable storage mediums for encoding and decoding messages for fast link adaptation. In one aspect, a method of a high efficiency (HE) station (STA) (HE STA) includes encoding an aggregated control subfield of a high throughput (HT) Control field to signal one or more of: a request to use dual carrier modulation (DCM), a request to use a particular resource unit, an uplink (UL) power headroom indication, and an indication that the HE STA is using a minimum transmit power for a current modulation and coding scheme (MCS). The method also includes configuring the HE STA to transmit a HE-PPDU including the HT control field.
1. An apparatus of a high efficiency (HE) station (STA) (HE STA) comprising memory; and
processing circuitry coupled to the memory, the processing circuitry configured to:
encode a HE-PPDU to include a thirty-two (32) bit High Throughput (HT) Control field;
wherein the processing circuitry is to encode the HE-PPDU to indicate that a format of the HT Control field is a Very High Throughput (VHT) variant by setting bit zero (0) the HT Control field to a value of one (1) and setting bit one (1) the HT Control field to a value of zero (0),
wherein the processing circuitry is to encode the HE-PPDU to indicate that the format of the HT Control field is a High Efficiency (HE) variant by setting bit zero (0) the HT Control field to a value of one (1) and setting bit one (1) the HT Control field to a value of zero (1),
wherein when the format of the HT control field is encoded to indicate the VHT variant, bits 2 - 29 of the HT control field comprise a VHT Control Middle subfield, bit 30 of the HT control field comprises an Access Category (AC) constraint subfield, and bit 31 of the HT control field comprises a RDG/More PPDU subfield, and
wherein when the format of the HT control field is encoded to indicate the HE variant, bits 2 - 31 of the HT Control field comprise an aggregated control subfield (A-Control subfield),
wherein for HE link adaptation when the format of the HT control field is encoded to indicate the HE variant, the processing circuitry is configured to encode the A-Control subfield to include at least a one-bit MRQ subfield, a three-bit NSS subfield, a four-bit MCS subfield, and a one-bit DCM subfield,
wherein the MRQ subfield indicates whether feedback is requested or being provided;
wherein the DCM subfield is a request by the HE STA for an access point to use dual carrier modulation (DCM) in communication between the HE STA and the access point,
wherein the NSS subfield indicates a recommended number of spatial streams for the communication between the HE STA and the access point,
wherein the MCS subfield indicates a recommended modulation and coding scheme for the communication between the HE STA and the access point, and
wherein the HT control field is further encoded to include a request to the access point, by the HE STA to assign a particular resource unit for use in the communication between the HE STA and the access point; and
configure the HE STA to transmit the HE-PPDU including the HT control field,
wherein the processing circuitry is to configure HE STA to determine levels of interference present on a plurality of resource units within a bandwidth of the HE-PPDU and request the particular resource unit in the aggregated control subfield based on the determined levels of interference, and
wherein the particular resource unit (RU) comprises one of: a 26-subcarrier RU, a 52-subcarrier RU, 106-subcarrier RU, 242-subcarrier RU, 484-subcarrier RU, and a 996-subcarrier RU.
2. The apparatus of claim 1 , wherein the processing circuitry is further configured to set a plurality of bits of the aggregated control subfield to signal a UL power headroom indication.
3. The apparatus of claim 1 , wherein the processing circuitry is further configured to encode the aggregated control subfield of the HT Control field to signal a resource unit the HE STA requests that the access point not assign for use in communication between the HE STA and the access point.
4. A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of a high efficiency (HE) station (STA) (HE STA), the processing circuitry configured to:
encode a HE-PPDU to include a thirty-two (32) bit High Throughput (HT) Control field;
wherein the processing circuitry is to encode the HE-PPDU to indicate that a format of the HT Control field is a Very High Throughput (VHT) variant by setting bit zero (0) the HT Control field to a value of one (1) and setting bit one (1) the HT Control field to a value of zero (0),
wherein the processing circuitry is to encode the HE-PPDU to indicate that the format of the HT Control field is a High Efficiency (HE) variant by setting bit zero (0) the HT Control field to a value of one (1) and setting bit one (1) the HT Control field to a value of zero (1),
wherein when the format of the HT control field is encoded to indicate the VHT variant, bits 2 - 29 of the HT control field comprise a VHT Control Middle subfield, bit 30 of the HT control field comprises an Access Category (AC) constraint subfield, and bit 31 of the HT control field comprises a RDG/More PPDU subfield, and
wherein when the format of the HT control field is encoded to indicate the HE variant, bits 2 - 31 of the HT Control field comprise an aggregated control subfield (A-Control subfield)
wherein for HE link adaptation when the format of the HT control field is encoded to indicate the HE variant, the processing circuitry is configured to encode the A-Control subfield to include at least a one-bit MRQ subfield, a three-bit NSS subfield, a four-bit MCS subfield, and a one-bit DCM subfield,
wherein the MRQ subfield indicates whether feedback is requested or being provided;
wherein the DCM subfield is a request by the HE STA for an access point to use dual carrier modulation (DCM) in communication between the HE STA and the access point,
wherein the NSS subfield indicates a recommended number of spatial streams for the communication between the HE STA and the access point;
wherein the MCS subfield indicates a recommended modulation and coding scheme for the communication between the HE STA and the access point, and
wherein the HT control field is further encoded to include a request to the access point, by the HE STA to assign a particular resource unit for use in the communication between the HE STA and the access point; and
configure the HE STA to transmit the HE-PPDU including the HT control field,
wherein the processing circuitry is to configure HE STA to determine levels of interference present on a plurality of resource units within a bandwidth of the HE-PPDU and request the particular resource unit in the aggregated control subfield based on the determined levels of interference, and
wherein the particular resource unit (RU) comprises one of: a 26-subcarrier RU, a 52-subcarrier RU, 106-subcarrier RU, 242-subcarrier RU, 484-subcarrier RU, and a 996-subcarrier RU.