Communication station and method for communicating using minimum bandwidth units of various tone allocations for OFDMA HEW
Embodiments of a communication station and method for communicating in a wireless network are generally described herein. In some embodiments, the communication station may be configured to communicate orthogonal frequency division multiplexed (OFDM) symbols on channel resources in accordance with an orthogonal frequency division multiple access (OFDMA) technique during a control period. The channel resources may comprise one or more minimum bandwidth units. Each minimum bandwidth unit may have a predetermined bandwidth and may be configured in accordance with one of a plurality of subcarrier allocations for one of a plurality of interleaver configurations.
1. A communication station comprising:
medium access control (MAC) layer circuitry to receive control of channel resources for a control period, wherein during the control period, the MAC layer circuitry is configured to obtain exclusive access to the channel resources for a period of time and communicate with a plurality of stations; and
physical layer (PHY) circuitry to communicate orthogonal frequency division multiplexed (OFDM) symbols on the channel resources in accordance with an orthogonal frequency division multiple access (OFDMA) technique during the control period, the channel resources comprising one or more minimum bandwidth units, each minimum bandwidth unit having a predetermined bandwidth,
wherein the minimum bandwidth units are configured in accordance with one of a plurality of subcarrier allocations for one of a plurality of interleaver configurations, and wherein during the control period the PHY circuitry is configured to communicate with the stations on one or more of the minimum bandwidth units.
2. The communication station of claim 1 wherein each of a plurality of 20 MHz channels are configurable to include two or more minimum bandwidth units and are configurable for 20 MHz, 40 MHz, 80 MHz and 160 MHz bandwidth operations, and
wherein the subcarrier allocations for the minimum bandwidth units comprise a predetermined number of subcarriers comprising a number of data subcarriers and a number of pilot subcarriers.
3. The communication station of claim 2 wherein the PHY circuitry includes a block interleaver having a depth of one OFDM symbol, the block interleaver being configurable to interleave a block of encoded data in accordance with the plurality of interleaver configurations, and
wherein the interleaver configurations comprise a number of columns and a number of rows.
4. The communication station of claim 3 , wherein the PHY circuitry further comprises:
an encoder configured to encode input data prior to interleaving; and
a constellation mapper to map interleaved data after the interleaving,
wherein the encoder and mapper operate in accordance with one of a plurality of predetermined modulation and coding scheme (MCS) combinations for the subcarrier allocation,
wherein the plurality of predetermined MCS combinations for the subcarrier allocation are restricted to an integer number of coded bits per OFDM symbol (Ncbps) and an integer number of data bits per OFDM symbol (Ndbps).
5. The communication station of claim 4 wherein for a minimum bandwidth unit having fourteen subcarriers, the subcarrier allocation comprises twelve data subcarriers and two pilot subcarriers and the interleaver configuration comprises six columns (NCol) and a number of rows (Nrow) equaling two times a number of coded bits per single subcarrier (NBPSCS).
6. The communication station of claim 4 wherein for a minimum bandwidth unit having fourteen subcarriers, the subcarrier allocation comprises thirteen data subcarriers and one pilot subcarrier and the interleaver configuration comprises six columns (NCol) and a number of rows (Nrow) equaling two times a number of coded bits per single subcarrier (NBPSCS).
7. The communication station of claim 4 wherein for a minimum bandwidth unit having twenty-eight subcarriers, the subcarrier allocation comprises twenty-four data subcarriers and four pilot subcarriers and the corresponding interleaver configuration comprises eight columns (NCol), and a number of rows (Nrow) equaling three times a number of coded bits per single subcarrier (NBPSCS).
8. The communication station of claim 4 wherein for a minimum bandwidth unit having twenty-eight subcarriers, the subcarrier allocation comprises twenty-six data subcarriers and two pilot subcarriers and the corresponding interleaver configuration comprises thirteen columns (NCol) and a number of rows (Now) equaling two times a number of coded bits per single subcarrier (NBPSCS).
9. The communication station of claim 4 wherein for a minimum bandwidth unit having fifty-six subcarriers: the subcarrier allocation comprises one of:
fifty-two data subcarriers and four pilot subcarriers; and
forty-eight data subcarriers and eight pilot subcarriers.
10. The communication station of claim 4 wherein the interleaver is configured by processing circuitry to interleave the encoded input data on a per minimum bandwidth unit basis.
11. The communication station of claim 4 wherein the interleaver is configured by processing circuitry to interleave the encoded input data on a 2× minimum bandwidth unit basis.
12. The communication station of claim 4 , wherein for a minimum bandwidth unit having twenty-eight subcarriers, the twenty-eight subcarriers are processed with 2×FFT size.
13. The communication station of claim 4 , wherein for a minimum bandwidth unit having twenty-eight subcarriers, the twenty-eight subcarriers are processed with 4×FFT size.
14. The communication station of claim 4 , wherein for a minimum bandwidth unit having fifty-six subcarriers, the fifty-six subcarriers are processed with 4×FFT size.
15. The communication station of claim 14 wherein when the subcarriers of a minimum bandwidth unit are processed with a 4×FFT size, a spacing between the subcarriers is reduced by ¼, and
wherein when the subcarriers of a minimum bandwidth unit are processed with a 2×FFT size, a spacing between the subcarriers is reduced by ½.
16. The communication station of claim 1 wherein the communication station is a high-efficiency WLAN (HEW) access point configured to operate as a master station and configured to:
contend for a wireless medium during a contention period to receive control of the medium for the control period; and
communicate the OFDM symbols with scheduled HEW devices during the control period, wherein during the control period, the master station has exclusive use of the wireless medium for communication with the scheduled HEW stations in accordance with the OFDMA technique.
17. The communication station of claim 1 wherein the communication station is a high-efficiency WLAN (HEW) device configured to communicate with an HEW master station during the control period.
18. A method for communicating in an IEEE 802.11 network by a communication station, the method comprising:
receiving control of channel resources for a control period and obtaining, during the control period, exclusive access to the channel resources for a period of time to communicate with a plurality of stations, the channel resources comprising one or more minimum bandwidth units, each minimum bandwidth unit having a predetermined bandwidth; and
communicating, with the stations, orthogonal frequency division multiplexed (OFDM) symbols on one or more of the minimum bandwidth units in accordance with an orthogonal frequency division multiple access (OFDMA) technique during the control period,
wherein the minimum bandwidth units are configured in accordance with one of a plurality of subcarrier allocations for one of a plurality of interleaver configurations.
19. The method of claim 18 wherein each of a plurality of 20 MHz channels are configurable to include two or more minimum bandwidth units and are configurable for 20 MHz, 40 MHz, 80 MHz and 160 MHz bandwidth operations, and
wherein the subcarrier allocations for the minimum bandwidth units comprise a predetermined number of subcarriers comprising a number of data subcarriers and a number of pilot subcarriers, and
wherein the method further comprises configuring a block interleaver to interleave blocks of encoded input data in accordance with one of the interleaver configurations.
20. The method of claim 19 wherein the interleaver configurations comprise a number of columns and a number of rows, and
wherein the method further comprises:
encoding input data prior to interleaving; and
mapping interleaved data after the interleaving,
wherein the encoding and mapping operate in accordance with one of a plurality of predetermined modulation and coding scheme (MCS) combinations for the subcarrier allocation,
wherein the plurality of predetermined MCS combinations for the subcarrier allocation are restricted to an integer number of coded bits per OFDM symbol (Ncbps) and an integer number of data bits per OFDM symbol (Ndbps).
21. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors to perform operations to configure a communication station to:
receive control of channel resources for a control period, wherein during the control period, the communication station is configured to obtain exclusive access to the channel resources for a period of time and communicate with a plurality of stations; and
communicate orthogonal frequency division multiplexed (OFDM) symbols on the channel resources in accordance with an orthogonal frequency division multiple access (OFDMA) technique during the control period, the channel resources comprising one or more minimum bandwidth units, each minimum bandwidth unit having a predetermined bandwidth,
wherein the minimum bandwidth units are configured in accordance with one of a plurality of subcarrier allocations for one of a plurality of interleaver configurations, and wherein during the control period the communication station is configured to communicate with the stations on one or more of the minimum bandwidth units.
22. The non-transitory computer-readable storage medium of claim 21
wherein the subcarrier allocations for the minimum bandwidth units comprise a predetermined number of subcarriers comprising a number of data subcarriers and a number of pilot subcarriers, and
wherein a plurality of predetermined modulation and coding scheme (MCS) combinations for the subcarrier allocation are restricted to an integer number of coded bits per OFDM symbol (Ncbps) and an integer number of data bits per OFDM symbol (Ndps).