EP3158702A1 - Station de communication de haute efficacité (he) et procédé pour communiquer des symboles de multiplexage par répartition orthogonale de la fréquence (ofdm) d'une durée plus longue dans des affectations de bande passante de 40 mhz et 80 mhz - Google Patents

Station de communication de haute efficacité (he) et procédé pour communiquer des symboles de multiplexage par répartition orthogonale de la fréquence (ofdm) d'une durée plus longue dans des affectations de bande passante de 40 mhz et 80 mhz

Info

Publication number
EP3158702A1
EP3158702A1 EP15809284.1A EP15809284A EP3158702A1 EP 3158702 A1 EP3158702 A1 EP 3158702A1 EP 15809284 A EP15809284 A EP 15809284A EP 3158702 A1 EP3158702 A1 EP 3158702A1
Authority
EP
European Patent Office
Prior art keywords
resource allocation
longer
ofdm symbols
mhz
duration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15809284.1A
Other languages
German (de)
English (en)
Other versions
EP3158702A4 (fr
Inventor
Shahrnaz Azizi
Thomas J. Kenney
Eldad Perahia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intel IP Corp
Original Assignee
Intel IP Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US14/447,254 external-priority patent/US20150139118A1/en
Priority claimed from US14/573,912 external-priority patent/US9680603B2/en
Application filed by Intel IP Corp filed Critical Intel IP Corp
Publication of EP3158702A1 publication Critical patent/EP3158702A1/fr
Publication of EP3158702A4 publication Critical patent/EP3158702A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2603—Signal structure ensuring backward compatibility with legacy system

Definitions

  • Embodiments pertain to wireless networks. Some embodiments relate to wireless local area networks (WLANs) and Wi-Fi networks including networks operating in accordance with the IEEE 802.11 family of standards. Some embodiments relate to the High Efficiency WLAN Study Group (HEW SG) (named DensiFi) and referred to as the IEEE 802.1 lax SG. Some embodiments relate to high-efficiency (HE) wireless communications and high- efficiency WLAN (HEW) communications, including HE Wi-Fi
  • Wireless communications has been evolving toward ever increasing data rates (e.g., from IEEE 802.1 la/g to IEEE 802.1 In to IEEE 802.1 lac).
  • overall system efficiency may become more important than higher data rates.
  • many devices competing for the wireless medium may have low to moderate data rate requirements (with respect to the very high data rates of IEEE 802.1 lac).
  • the frame structure used for conventional and legacy IEEE 802.11 communications including very-high throughput (VHT) communications may be less suitable for such high-density deployment situations.
  • the recently-formed Task Group for High Efficiency WLAN referred to as the IEEE 802.1 lax is addressing these high-density deployment scenarios.
  • One issue with HEW is defining an efficient communication structure that is able to reuse at least some IEEE 802.1 lac hardware, such as tone allocation and the block interleaver circuitry.
  • Another issue with HEW is defining an efficient communication structure that suitable for use with longer OFDM symbol durations, particularly OFDM symbols having a duration four- times (4x) as long as the standard (lx) symbol duration or longer.
  • Another issue with HEW is defining an efficient communication structure that suitable for use with longer OFDM symbol durations for communicating over wider bandwidths, such as 40 MHz and 80 MHz bandwidths.
  • FIG. 1 illustrates a HEW network in accordance with some embodiments
  • FIG. 2 is a partial physical-layer block diagram of an HEW communication station in accordance with some embodiments
  • FIG. 3 illustrates an HEW device in accordance with some embodiments.
  • FIG. 4 is a procedure for communicating using resource allocation units in accordance with some embodiments.
  • FIG. 1 illustrates a HEW network in accordance with some embodiments.
  • HEW network 100 may include a master station (ST A) 102, a plurality of HEW stations 104 (HEW devices), and a plurality of legacy stations 106 (legacy devices).
  • the master station 102 may be arranged to communicate with the HEW stations 104 and the legacy stations 106 in accordance with one or more of the IEEE 802.11 standards.
  • ST A master station
  • HEW devices a plurality of HEW stations 104
  • legacy stations 106 legacy stations
  • the master station 102 may be arranged to contend for a wireless medium (e.g., during a contention period) to receive exclusive control of the medium for an HEW control period (i.e., a transmission opportunity (TXOP)).
  • the master station 102 may, for example, transmit a master-sync or control transmission at the beginning of the HEW control period to indicate, among other things, which HEW stations 104 are scheduled for communication during the HEW control period.
  • the scheduled HEW stations 104 may communicate with the master station 102 in accordance with a non-contention based multiple access technique. This is unlike
  • the master station 102 may communicate with HEW stations 104 (e.g., using one or more HEW frames).
  • legacy stations 106 may refrain from communicating.
  • control and schedule transmission may be referred to as a control and schedule transmission.
  • the multiple-access technique used during the HEW control period may be a scheduled orthogonal-frequency divisional multiple access (OFDMA) technique, although this is not a requirement.
  • the multiple access technique may be a time-division multiple access (TDMA) technique or a frequency division multiple access (FDMA) technique which may be combined with OFDMA.
  • the multiple access technique may be a space-division multiple access (SDMA) technique including a multi-user (MU) multiple-input multiple-output (MIMO) (MU-MIMO) technique, which may be combined with OFDMA.
  • SDMA space-division multiple access
  • MU multi-user
  • MIMO multiple-input multiple-output
  • MU-MIMO multi-user multiple-input multiple-output
  • the master station 102 may also communicate with legacy stations 106 in accordance with legacy IEEE 802.11 communication techniques (outside the control period).
  • the master station 102 may also be configurable communicate with the HEW stations 104 outside the control period in accordance with legacy IEEE 802.11 communication techniques, although this is not a requirement.
  • the HEW communications during the control period may be configurable to have bandwidths of one of 20 MHz, 40 MHz, or 80 MHz contiguous bandwidths or an 80+80 MHz (160 MHz) noncontiguous bandwidth.
  • a 320 MHz channel bandwidth may be used.
  • subchannel bandwidths less than 20 MHz may also be used.
  • each channel or subchannel of an HEW communication may be configured for transmitting a number of spatial streams.
  • HEW communications during the control period may be uplink or downlink communications .
  • Some embodiments disclosed herein provide systems and methods for subcarrier (e.g., tone) allocation in a HEW network.
  • the master station 102 or HEW station 104 may allocate tones to provide a smallest OFDMA bandwidth unit (i.e., a resource allocation unit).
  • the master station 102 or HEW station 104 may be configured to communicate longer-duration orthogonal-frequency division multiplexed (OFDM) symbols on channel resources that comprise one or more resource allocation units.
  • Each resource allocation unit may have a
  • the resource allocation units may be configured in accordance with one of a plurality of subcarrier allocations for one of a plurality of interleaver configurations.
  • optimum subcarrier allocations and interleaver size combinations are provided for use with the OFDMA resource allocation units for communication using longer-duration OFDM symbols. These embodiments are discussed in more detail below. Some embodiments disclosed herein are applicable to communications using longer- duration OFDM symbols (e.g., having a 4x symbol duration or longer), although the scope of the embodiments is not limited in this respect. Some embodiments disclosed herein are applicable to communications using larger fast-Fourier transform (FFT) sizes), although the scope of the embodiments is not limited in this respect.
  • FFT fast-Fourier transform
  • an HEW station (e.g., master station 102 or an HEW station 104) may be configured to communicate longer- duration OFDM symbols on channel resources in accordance with an OFDMA technique.
  • the channel resources may comprise one or more resource allocation units and each resource allocation unit may have a predetermined number of data subcarriers.
  • the longer-duration OFDM symbols may have symbol duration that is 4x a standard OFDM symbol duration (i.e., the symbol time (e.g., T symbo i)).
  • the resource allocation units may be configured in accordance with one of a plurality of subcarrier allocations for one of a plurality of interleaver
  • Some of the embodiments disclosed herein may be applicable to IEEE 802.1 lax and HEW networks operating with a longer OFDM symbol duration (e.g., four times (4x) the standard symbol duration), although the scope of the embodiments is not limited in this respect.
  • an HEW master station 102 and an HEW station 104 may comprise physical layer (PHY) and medium access control (MAC) layer circuitry.
  • the PHY circuitry may include a block interleaver having a depth of one OFDM symbol.
  • the block interleaver may be configurable to interleave a block of encoded data in accordance with any one of the plurality of interleaver configurations.
  • the interleaver configurations may comprise a number of columns and a number of rows.
  • FIG. 2 is a partial physical-layer block diagram of an HEW communication station in accordance with some embodiments.
  • the PHY layer circuitry 200 may be suitable for use as a portion of the physical layer of an HEW communication station, such as master station 102 (FIG. 1) and/or HEW communication station 104 (FIG. 1).
  • the PHY layer circuitry 200 may include, among other things, one or more encoders 208, one or more block interleavers 214, one or more constellation mappers 216 and FFT processing circuitry 218.
  • Each of the encoders 208 may be configured to encode input data prior to interleaving by the interleavers 214.
  • Each of the constellation mappers 216 may be configured to map interleaved data to a constellation (e.g., a quadrature amplitude modulation (QAM) constellation) after interleaving.
  • Each interleaver 214 may be configured to interleave a block of encoded data in accordance with any one of the plurality of interleaver configurations.
  • the encoders 208 may be binary convolutional code (BCC) encoders, although the scope of the embodiments is not limited in this respect.
  • the encoders 208 may be low-density parity check (LDPC) encoders.
  • An FFT may be performed by the FFT processing circuitry 218 on the constellation-mapped symbols provided by the constellation mappers to generate time-domain signals for transmission by one or more antennas.
  • interleaving is performed, while in embodiments that perform LDPC encoding, interleaving is not performed.
  • the 216 operate in accordance with one of a plurality of predetermined modulation and coding scheme (MCS) combinations for the particular subcarrier allocation (i.e., the tone allocation).
  • MCS modulation and coding scheme
  • the plurality of predetermined MCS combinations for the subcarrier allocation may be restricted to an integer number of coded bits per OFDM symbol (Ncbps) and an integer number of data bits per OFDM symbol (Ndbps).
  • Ncbps integer number of coded bits per OFDM symbol
  • Ndbps integer number of data bits per OFDM symbol
  • the number of coded bits per OFDM symbol is an integer number
  • number of data bits per OFDM symbol is an integer number.
  • the predetermined MCS combinations and subcarrier allocations that may be used may include modulation orders of BPSK, QPSK, 16-QAM, 64-
  • a non-integer Ndbps may result in a non- integer number of padding bits or the number of encoded bits exceeding the number of OFDM symbols which may lead to an OFDM symbol comprised of only padding bits.
  • An integer Ndbps may guarantee that all data lengths work with no additional padding using the IEEE 802.1 In "Number of OFDM
  • interleaver hardware architecture configurations are within the boundaries of an IEEE 802.11 interleaver allowing reuse of the legacy IEEE 802.11 hardware blocks for HEW.
  • the HEW communication station 102/104 may be configured to encode the input data based on a coding rate and subsequent to the interleaving and may be configured to constellation map interleaved bits to QAM constellation points based on a modulation level.
  • the coding rate and modulation level may be in accordance with one of the predetermined MCS combinations for the particular subcarrier allocation.
  • each resource allocation unit may be configurable for communication of between one and four spatial streams, although the scope of the embodiments is not limited in this respect.
  • an SDMA or MIMO technique may be used during the control period to communicate the spatial streams.
  • each resource allocation unit may be configurable for communication of up to eight or more spatial streams,
  • Some embodiments disclosed herein provide a number of data subcarriers, number of pilot subcarriers, and the size of block interleaver for the case of binary convolutional code coding.
  • Provisional Patent Application, Serial No. 61/976,951 may be suitable for use, although this is not a requirement.
  • Some embodiments disclosed herein describe the resource allocation unit for the OFDMA waveform and describe the subcarrier allocation.
  • the subcarrier allocation may be configured to reuse some of the IEEE 802.1 lac hardware to create the new OFDMA structure.
  • a HEW communication station (e.g., master station 102 or HEW station 104) may be configured to communicate longer-duration OFDM symbols on channel resources in accordance with an OFDMA technique.
  • the channel resources may comprise one or more resource allocation units and each resource allocation unit may comprise a predetermined number of data subcarriers.
  • the HEW communication station may configure the resource allocation units in accordance with one of a plurality of subcarrier allocations for one of a plurality of interleaver configurations for communication of the longer-duration OFDM symbols.
  • the longer-duration OFDM symbols may have a symbol duration that is four-times as long (4x) as a standard OFDM symbol duration and the station may be configurable to process the longer-duration OFDM symbols with at least one of a 512-point fast-Fourier Transform (FFT) for communication over a 40 MHz channel bandwidth comprising a 40 MHz resource allocation unit, and a 1024-point FFT for communication over an 80 MHz channel bandwidth.
  • the 80 MHz channel bandwidth may comprise either two 40 MHz resource allocation units or one 80 MHz resource allocation unit.
  • the communication station when operating as a master station 102, may be configurable to process the longer-duration OFDM symbols for a single user station (e.g., an HEW station 104) using the 512-point FFT for communication within a 40 MHz resource allocation unit, process the longer-duration OFDM symbols for a single user station using the 1024-point FFT for communication within an 80 MHz resource allocation unit, and process the longer-duration OFDM symbols for two user stations using the 512-point FFT for communication within an 80 MHz resource allocation unit.
  • a user station may operate using an 80 MHz bandwidth in the basic service set (BSS) and may process the 4x symbols using a 1024-point FFT.
  • BSS basic service set
  • User stations may also operate using a 40 MHz bandwidth in the BSS and may process 4x symbols using a 512-point FFT. Although embodiments are described herein with respect to a 4x symbol duration, in some alternate embodiments, a 512-point FFT may be used to process symbols having a 2x symbol duration within an 80 MHz resource allocation unit and a 1024-point FFT may be used to process symbols having an 8x symbol duration with a 40 MHz resource allocation unit.
  • the predetermined number of data subcarriers for the 80 MHz resource allocation unit may comprise 936 data subcarriers for an interleaver
  • the predetermined number of data subcarriers for the 40 MHz resource allocation unit may comprise 468 data subcarriers for an interleaver
  • the predetermined number of data subcarriers for the 40 MHz resource allocation unit may comprise 490 data subcarriers for an interleaver configuration having either 14 or 35 columns.
  • an HEW master station 102 may be configurable to process the longer-duration OFDM symbols from one or two user stations using the 512-point FFT received within a 40 MHz resource allocation unit and process the longer-duration OFDM symbols from one user station using a 256-point FFT received within a 20 MHz resource allocation unit.
  • the longer-duration OFDM symbols with the 256-point FFT without a code-rate exclusion for processing the longer-duration OFDM symbols with the 256-point FFT without a code-rate exclusion, the
  • predetermined number of data subcarriers for the 20 MHz resource allocation unit may comprise 234 data subcarriers for an interleaver configuration having 26 columns, 228 data subcarriers for an interleaver configuration having 19 columns, and 240 data subcarriers for an interleaver configuration having 20 columns.
  • an HEW master station 102 may also be configurable to process the longer-duration OFDM symbols from two user stations using the 256-point FFT received within a 20 MHz resource allocation unit.
  • the predetermined number of data subcarriers for the 20 MHz resource allocation unit may comprise 102 data subcarriers for an interleaver configuration having 6 or 17 columns and 108 data subcarriers for an interleaver configuration having 18 columns.
  • the predetermined number of data subcarriers for the 20 MHz resource allocation unit may be 104 data subcarriers for an interleaver configuration having 13 columns.
  • the interleaver 214 may be a block interleaver having a depth of one OFDM symbol and may be configurable to interleave a block of encoded data.
  • the interleaver configurations may comprise a number of columns and a number of rows where the number of rows may be based on a number of coded bits per subcarrier per stream.
  • the encoders 208 may encode input data prior to interleaving in accordance with one of a plurality of code rates.
  • the constellation mappers 216 may map the encoded data after the interleaving to a QAM constellation.
  • the encoders 208 and mappers 216 may operate in accordance with one of a plurality of predetermined modulation and coding scheme (MCS) combinations for the subcarrier allocation.
  • MCS modulation and coding scheme
  • the plurality of predetermined MCS combinations for the subcarrier allocation may be restricted to an integer number of coded bits per OFDM symbol (Ncbps) and an integer number of data bits per OFDM symbol (Ndbps).
  • the longer-duration OFDM symbols may be selected for larger delay-spread environments and the standard-duration OFDM symbols may be selected for smaller delay-spread environments.
  • the standard-duration OFDM symbols may be used for legacy communications (e.g., IEEE 802.1 la/n/ac/g) and the symbol duration is not based on the delay-spread of the channel.
  • the standard-duration OFDM symbols may have a symbol duration that ranges from 3.6 micro-seconds (us) including a 400 nanosecond (ns) short guard interval to 4 us including an 800 ns guard interval.
  • the longer-duration OFDM symbols have a symbol duration is 4x the duration of the standard-duration OFDM symbols.
  • the subcarrier spacing may be reduced by a factor of four (e.g., one-fourth of 312.5 KHz).
  • a subcarrier allocation with more guard subcarriers may be used for closer subcarrier spacings.
  • the master station 102 may be configured to concurrently communicate using several resource allocation units within the channel bandwidth.
  • a detailed design e.g., number of Data subcarriers and number of Pilot subcarriers and for the case of BCC encoding it provides the size of block interleaver
  • the 1024-point FFT as well as the 512-point FFT may be used with a 4x symbol duration and is in particular of interest in both outdoor and indoor environment.
  • a four times longer symbol duration may enable the use of a more efficient cyclic prefix (CP) to overcome the longer delay spread.
  • CP cyclic prefix
  • the longer symbol duration may allow a more relaxed requirement for clock timing accuracy.
  • the total number of subcarriers used in the smallest bandwidth unit may be a system design parameter. From the total subcarrier count, the OFDMA system has subcarriers that are assigned to data (used for data), pilot (typically used for time/frequency and channel tracking), guard (used to conform to a spectral mask) and the subcarriers at DC and around DC (to simplify direct conversion receiver designs). For example, in 20 MHz IEEE 802.1 lac, the fixed subcarrier spacing is 312.5 kHz and thus the total number of subcarrier is 64. Of these 64 subcarriers, 52 subcarriers are designated for data, 1 subcarrier for DC (assumed nulled), 4 subcarriers for pilot and the remaining 7 subcarriers are used for guard (assumed nulled).
  • Embodiments disclosed herein provide for subcarrier allocations based on the set of modulation types used in previous systems (e.g., BPSK, QPSK, 16-QAM, 64-QAM and 256-QAM).
  • the same modulation and coding assignments may be used as done in the previous systems (e.g., IEEE 802.1 la/.1 In/.1 lac).
  • the existing channel interleaver from previous IEEE 802.11 OFDM systems may be used.
  • the channel interleaver such as the channel interleaver defined in section 22.3.10.8 of the IEEE Std. 802.1 lac-2013, "IEEE Standard for Information Technology- Telecommunications and information exchange between systems - Local and metropolitan area networks - Part 11 : Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, Amendment 4: Enhancements for Very High Throughput for Operation in Bands below 6GHz" may be used, although the scope of the embodiment is not limited in this respect.
  • the interleaver parameters are outlined in Table 22-17 "Number of Rows and columns in the interleaver" the IEEE specification. The table is included here for completeness as Table I, for the case of 1 to 4 spatial streams.
  • IEEE 802.1 In IEEE 802.1 In, the introduction of 40 MHz was done reusing the existing interleaver algorithm with modifications to the matrix size defined to write and read the data. Then in IEEE 802.1 lac, with the introduction of 80 MHz, the same interleaver algorithm was utilized. These parameters define the number of coded symbols that are stored in the interleaver. Embodiments disclosed herein may also reuse the existing interleaver algorithm with new values to define NCOL and NROW for the OFDMA allocations. Since the NROT operation defines a rotation of the values when more than one spatial stream exists this term may be ignored as NROT does not define the interleaver size and thus will not affect the subcarrier selection.
  • the NROW is a constant times the number of coded bits per subcarrier per stream.
  • the interleaver physical size is a function of the MCS.
  • Some embodiments disclosed herein define the constant (y), used in computing NROW.
  • Embodiments disclosed herein define subcarrier allocations based on an exhaustive search within a boundary to arrive at all reasonable subcarrier allocations under the target constraints outlined above. Some embodiments disclosed herein may not provide an exact definition for the interleaver parameters, but solutions for many interleaver structures using the above constraints.
  • Embodiments disclosed herein provide a set of subcarrier allocations using the above constraints suitable for use with the longer symbol duration for OFDMA 80 MHz and 40 MHz bandwidth units and may allow multiplexing of up to 18 users in 80 MHz (or up to 9 users in 40 MHz).
  • the fixed subcarrier spacing is 312.5 kHz and thus the total number of subcarrier is 64. Of these 64, 52 are used for data, 1 for DC (assumed nulled), 4 for pilot and the remaining 7 are used for guard (assumed nulled).
  • the FFT sizes may be 256 in 20 MHz, 512 in 40 MHz and 1024 in 80 MHz. Initially, an algorithm may be used to search anywhere from 208 to 244 subcarriers for each of two users for the data subcarriers, which would then allow 52 to 12 null subcarriers respectively for 2 users to be assigned in 40 MHz bandwidth.
  • the algorithm may then searched anywhere from 416 to 504 subcarriers for each of two users for the data subcarriers, which would then allow 96 to 8 null subcarriers respectively for 2 users to be assigned in 80 MHz of bandwidth. To determine if a configuration is possible, a set of equations may be used. Finally, the algorithm may search anywhere from 896 to 1012 subcarriers for one user for the data subcarriers, which would then allow 128 to 12 null subcamers respectively to be assigned in 80 MHz bandwidth. For clarity a set of variables are defined below:
  • a script may be configured to find the possible combinations.
  • all modulations can be supported as in IEEE 802.1 lac for 40 MHz and 80 MHz.
  • the allocations allowed for 1024pt FFT may include:
  • the search results show that there are many possibilities for the number of data tones that would leave extra subcarriers within the 80 MHz.
  • the extra tones may be used for pilot tones, null at DC, null subcarriers as guard bands, and even null subcarriers to be inserted between users. From the above list, a preferred selection is outlined in the table below.
  • Table III [0042] Table Ilia (below) lists some additional allocation sizes where
  • a similar search may be performed for two users in 80 MHz
  • Table IV [0045] The search may be repeated but without requiring support of code rate 5/6 with 256QAM (i.e., the same exclusion that is used for 20 MHz in IEEE 802.1 lac).
  • code rate 5/6 i.e., the same exclusion that is used for 20 MHz in IEEE 802.1 lac.
  • possible allocations for the 512pt FFT besides those listed in Table IV may include:
  • the search results show that there are many possibilities for the number of data tones that would leave extra subcarriers within the 80 MHz and/or 40 MHz. These extra tones may be used for pilot tones, null at DC, null subcarriers as guard bands, and even null subcarriers to be inserted between users. From the above list, a preferred selection is outlined below.
  • the search may be repeated for two users in 40 MHz (with a 512- point FFT) or one user in 20 MHz (with a 256-point FFT) and the allowed allocations may include :
  • the search may be repeated for two users in 20 MHz (256-point FFT) with (the first three columns of Table IX) and without (the last three columns of Table IX) requiring support of code rate 5/6 with 256QAM, which the latter is the same exclusion that is used for 20 MHz in 802.1 lac).
  • the options for the 512pt FFT may include:
  • FIG. 3 illustrates an HEW device in accordance with some embodiments.
  • HEW device 300 may be an HEW compliant device that may be arranged to communicate with one or more other HEW devices, such as HEW stations and/or a master station, as well as communicate with legacy devices.
  • HEW device 300 may be suitable for operating as master station (HEW master station 102 (FIG. 1)) or an HEW station 104 (FIG. 1).
  • HEW device 300 may include, among other things, physical layer (PHY) circuitry 302 and medium-access control layer circuitry (MAC) 304.
  • PHY 302 and MAC 304 may be HEW compliant layers and may also be compliant with one or more legacy IEEE 802.11 standards.
  • PHY 302 may be arranged to transmit HEW frames.
  • HEW device 300 may also include other processing circuitry 306 and memory 308 configured to perform the various operations described herein.
  • the MAC 304 may be arranged to contend for a wireless medium during a contention period to receive control of the medium for the HEW control period and configure an HEW frame.
  • the PHY 302 may be arranged to transmit the HEW frame as discussed above.
  • the PHY 302 may also be arranged to receive an HEW frame from HEW stations.
  • MAC 304 may also be arranged to perform transmitting and receiving operations through the PHY 302.
  • the PHY 302 may include circuitry for modulation/demodulation, upconversion and/or downconversion, filtering, amplification, etc.
  • the processing circuitry 306 may include one or more processors.
  • two or more antennas may be coupled to the physical layer circuitry arranged for sending and receiving signals including transmission of the HEW frame.
  • the memory 308 may be store information for configuring the processing circuitry 306 to perform operations for configuring and transmitting HEW frames and performing the various operations described herein.
  • the HEW device 300 may be configured to communicate using OFDM communication signals over a multicarrier communication channel.
  • HEW device 300 may be configured to receive signals in accordance with specific communication standards, such as the Institute of Electrical and Electronics Engineers (IEEE) standards including IEEE 802.11-2012, IEEE 802.1 ln-2009, IEEE 802.1 lac- 2013 and/or the IEEE 802.1 lax standards and/or proposed specifications for WLANs including proposed HEW standards, although the scope of the invention is not limited in this respect as they may also be suitable to transmit and/or receive communications in accordance with other techniques and standards.
  • IEEE Institute of Electrical and Electronics Engineers
  • HEW device 300 may be configured to receive signals that were transmitted using one or more other modulation techniques such as spread spectrum modulation (e.g., direct sequence code division multiple access (DS-CDMA) and/or frequency hopping code division multiple access (FH- CDMA)), time-division multiplexing (TDM) modulation, and/or frequency- division multiplexing (FDM) modulation, although the scope of the modulation techniques
  • spread spectrum modulation e.g., direct sequence code division multiple access (DS-CDMA) and/or frequency hopping code division multiple access (FH- CDMA)
  • TDM time-division multiplexing
  • FDM frequency- division multiplexing
  • HEW device 300 may be part of a portable wireless communication device, such as a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone or smartphone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point, a television, a medical device (e.g., a heart rate monitor, a blood pressure monitor, etc.), or other device that may receive and/or transmit information wirelessly.
  • PDA personal digital assistant
  • HEW device 300 may include one or more of a keyboard, a display, a nonvolatile memory port, multiple antennas, a graphics processor, an application processor, speakers, and other mobile device elements.
  • the display may be an LCD screen including a touch screen.
  • the antennas 301 of HEW device 300 may comprise one or more directional or omnidirectional antennas, including, for example, dipole antennas, monopole antennas, patch antennas, loop antennas, microstrip antennas or other types of antennas suitable for transmission of RF signals.
  • the antennas 301 may be effectively separated to take advantage of spatial diversity and the different channel characteristics that may result between each of antennas and the antennas of a transmitting station.
  • HEW device 300 is illustrated as having several separate functional elements, one or more of the functional elements may be combined and may be implemented by combinations of software-configured elements, such as processing elements including digital signal processors (DSPs), and/or other hardware elements.
  • DSPs digital signal processors
  • some elements may comprise one or more microprocessors, DSPs, field-programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), radio-frequency integrated circuits (RFICs) and combinations of various hardware and logic circuitry for performing at least the functions described herein.
  • the functional elements of HEW device 300 may refer to one or more processes operating on one or more processing elements.
  • Embodiments may be implemented in one or a combination of hardware, firmware and software.
  • Embodiments may also be implemented as instructions stored on a computer-readable storage device, which may be read and executed by at least one processor to perform the operations described herein.
  • a computer-readable storage device may include any non-transitory mechanism for storing information in a form readable by a machine (e.g., a computer).
  • a computer-readable storage device may include readonly memory (ROM), random-access memory (RAM), magnetic disk storage media, optical storage media, flash-memory devices, and other storage devices and media.
  • Some embodiments may include one or more processors and may be configured with instructions stored on a computer-readable storage device.
  • FIG. 4 is a procedure for communicating longer-duration OFDM symbols using resource allocation units in accordance with some embodiments.
  • Procedure 400 may be performed by an HEW device, such as HEW station 104 (FIG. 1 ) or an HEW master station 102 (FIG. 1 ).
  • Operation 402 comprises configuring a block interleaver to interleave blocks of encoded input data in accordance with one of a plurality interleaver configurations determined for a subcarrier allocation of a resource allocation unit for longer-duration OFDM symbols.
  • Operation 404 comprises processing the longer-duration OFDM symbols with a 512-point FFT for communication over a 40 MHz channel bandwidth comprising a 40 MHz resource allocation unit.
  • Operation 406 comprises processing the longer-duration OFDM symbols with a 1024-point FFT for communication over an 80 MHz channel bandwidth comprising either two 40 MHz resource allocation units or one 80 MHz resource allocation unit.
  • the HEW device may be configured to perform either operation 404 or operation 406 depending on the resource allocation unit size.
  • Operation 408 comprises communicating the longer-duration OFDM symbols (in the form of the time-domain OFDM A waveforms) on channel resources comprising one or more resource allocation units in accordance with non-contention based communication technique.
  • the longer-duration OFDM symbols may be communicated during a control period (e.g., a TXOP) in accordance with MU-MIMO technique.
  • a high-efficiency (HE) communication station a high-efficiency (HE) communication station
  • ST A comprising physical layer and medium access control layer circuitry to: communicate longer-duration orthogonal frequency division multiplexed (OFDM) symbols on channel resources in accordance with an orthogonal frequency division multiple access (OFDMA) technique, the channel resources comprising one or more resource allocation units, each resource allocation unit comprising a predetermined number of data subcarriers; configure the resource allocation units in accordance with one of a plurality of subcarrier allocations for communication of the longer-duration OFDM symbols; and process the longer- duration OFDM symbols with at least one of: a 512-point fast-Fourier Transform (FFT) for communication over a 40 MHz channel bandwidth comprising a 40 MHz resource allocation unit; and a 1024-point FFT for communication over an 80 MHz channel bandwidth comprising either two 40 MHz resource allocation units or one 80 MHz resource allocation unit.
  • OFDM orthogonal frequency division multiplexed
  • OFDMA orthogonal frequency division multiple access
  • the resource allocation units are further configured in accordance with one of a plurality of interleaver configurations for the subcarrier allocations for communication of the longer-duration OFDM symbols, the longer-duration OFDM symbols have a symbol duration that is four-times as long (4x) as a standard OFDM symbol duration, and when operating as a master station 102, the communication station is configurable to: process the longer-duration OFDM symbols for a single user station using the 512-point FFT for communication within a 40 MHz resource allocation unit; process the longer-duration OFDM symbols for a single user station using the 1024-point FFT for communication within an 80 MHz resource allocation unit; and process the longer-duration OFDM symbols for two user stations using the 512-point FFT for
  • the predetermined number of data subcarriers for the 80 MHz resource allocation unit for BCC encoding is one of: 936 data subcarriers for an interleaver configuration having 26 columns, 960 data subcarriers for an interleaver configuration having either 15 or 20 columns, 984 data subcarriers for an interleaver configuration having either 24 or 41 columns, and 990 data subcarriers for an interleaver configuration having 22, 30 or 33 columns, and the predetermined number of data subcarriers for the 80 MHz resource allocation unit for low-density parity check (LDPC) encoding is one of 936 data subcarriers, 960 data subcarriers, 984 data subcarriers, and 990 data subcarrier.
  • LDPC low-density parity check
  • the predetermined number of data subcarriers for the 40 MHz resource allocation unit for BCC encoding is one of: 468 data subcarriers for an interleaver configuration having 26 columns, and 486 data subcarriers for an interleaver configuration having either 18 or 27 columns.
  • the predetermined number of data subcarriers for the 40 MHz resource allocation unit for BCC encoding is 490 data subcarriers for an interleaver configuration having either 14 or 35 columns, and the predetermined number of data subcarriers for the 40 MHz resource allocation unit for low-density parity check (LDPC) encoding is one of 468, 486 and 490 data subcarriers.
  • LDPC low-density parity check
  • the station is further configurable to: process the longer-duration OFDM symbols from one or two user stations using the 512- point FFT received within a 40 MHz resource allocation unit; and process the longer-duration OFDM symbols from one user station using a 256-point FFT received within a 20 MHz resource allocation unit.
  • predetermined number of data subcarriers for the 20 MHz resource allocation unit for BCC encoding is one of: 234 data subcarriers for an interleaver configuration having 26 columns, 228 data subcarriers for an interleaver configuration having 19 columns, and 240 data subcarriers for an interleaver configuration having 20 columns, and the predetermined number of data subcamers for the 20 MHz resource allocation unit for low-density parity check (LDPC) encoding is one of 234, 228 and 240 data subcarriers.
  • LDPC low-density parity check
  • the station is further configurable to: process the longer-duration OFDM symbols from two user stations using the 256-point FFT received within a 20 MHz resource allocation unit, and for processing the longer-duration OFDM symbols from two user stations without a code-rate exclusion of 5/6 for 256-QAM, the predetermined number of data subcarriers for the 20 MHz resource allocation unit for BCC encoding is one of: 102 data subcarriers for an interleaver configuration having 6 or 17 columns, and 108 data subcarriers for an interleaver configuration having 18 columns.
  • the predetermined number of data subcarriers for the 20 MHz resource allocation unit for BCC encoding is 104 data subcarriers for an interleaver configuration having 13 columns
  • the predetermined number of data subcarriers for the 20 MHz resource allocation unit for low- density parity check (LDPC) encoding is one of 102, 108 and 104 data subcarriers.
  • the physical-layer circuitry includes a block interleaver having a depth of one OFDM symbol, the block interleaver being configurable to interleave a block of encoded data when BCC encoding is used and refrain from interleaving when low-density parity check (LDPC) is used, and the interleaver configurations comprise a number of columns and a number of rows, the number of rows based on a number of coded bits per subcarrier per stream.
  • LDPC low-density parity check
  • the communication station further comprises an encoder to encode input data prior to interleaving in accordance with one of a plurality of code rates; and a constellation mapper to map the encoded data after the interleaving to a QAM constellation.
  • the encoder and mapper operate in accordance with one of a plurality of predetermined modulation and coding scheme (MCS) combinations for the subcarrier allocation, and 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).
  • MCS modulation and coding scheme
  • Ncbps integer number of coded bits per OFDM symbol
  • Ndbps integer number of data bits per OFDM symbol
  • the longer-duration OFDM symbols are to be selected for larger delay- spread environments, and standard-duration OFDM symbols are to be selected for either legacy communications or smaller delay- spread environments.
  • the standard-duration OFDM symbols have a symbol duration that ranges from 3.6 micro-seconds (us) including a 400 nanosecond (ns) short guard interval to 4 us including an 800 ns guard interval.
  • the communication station further comprises one or more processors and memory, and the physical layer circuitry includes a transceiver.
  • the communication station further comprises one or more antennas coupled to the transceiver.
  • a method for high-efficiency (HE) wireless communication comprises: communicating longer-duration orthogonal frequency division multiplexed (OFDM) symbols on channel resources in accordance with an orthogonal frequency division multiple access (OFDMA) technique, the channel resources comprising one or more resource allocation units, each resource allocation unit comprising a predetermined number of data subcarriers; configuring the resource allocation units in accordance with one of a plurality of subcarrier allocations for communication of the longer-duration OFDM symbols; and processing the longer-duration OFDM symbols with at least one of: a 512-point fast-Fourier Transform (FFT) for communication over a 40 MHz channel bandwidth comprising a 40 MHz resource allocation unit; and a 1024-point FFT for communication over an 80 MHz channel bandwidth comprising either two 40 MHz resource allocation units or one 80 MHz resource allocation unit.
  • OFDM orthogonal frequency division multiplexed
  • OFDMA orthogonal frequency division multiple access
  • the resource allocation units are further configured in accordance with one of a plurality of interleaver configurations for the subcarrier allocations for communication of the longer-duration OFDM symbols, and the longer-duration OFDM symbols have a symbol duration that is four-times as long (4x) as a standard OFDM symbol duration.
  • the method further comprises: processing the longer-duration OFDM symbols for a single user station using the 512-point FFT for communication within a 40 MHz resource allocation unit; processing the longer-duration OFDM symbols for a single user station using the 1024-point FFT for communication within an 80 MHz resource allocation unit; and processing the longer-duration OFDM symbols for two user stations using the 512-point FFT for communication within an 80 MHz resource allocation unit.
  • the method further comprises: processing the longer-duration OFDM symbols from one or two user stations using the 512- point FFT received within a 40 MHz resource allocation unit; and processing the longer-duration OFDM symbols from one user station using a 256-point FFT received within a 20 MHz resource allocation unit.
  • the method further comprises communicating the longer-duration OFDM symbols comprising one or more resource allocation units in accordance with a non-contention based communication technique during a control period.
  • a non-transitory computer-readable storage medium stores instructions for execution by one or more processors to perform operations to configure a high-efficiency (HE) communication station (STA) to: communicate longer-duration orthogonal frequency division multiplexed (OFDM) symbols on channel resources in accordance with an orthogonal frequency division multiple access (OFDMA) technique, the channel resources comprising one or more resource allocation units, each resource allocation unit comprising a predetermined number of data subcarriers; configure the resource allocation units in accordance with one of a plurality of subcarrier allocations for communication of the longer-duration OFDM symbols; and process the longer- duration OFDM symbols with at least one of: a 512-point fast-Fourier Transform (FFT) for communication over a 40 MHz channel bandwidth comprising a 40 MHz resource allocation unit; and a 1024-point FFT for communication over an 80 MHz channel bandwidth comprising either two 40 MHz resource allocation units or one 80 MHz resource allocation unit.
  • FFT fast-Fourier Transform
  • the resource allocation units are further configured in accordance with one of a plurality of interleaver configurations for the subcarrier allocations for communication of the longer-duration OFDM symbols, the longer-duration OFDM symbols have a symbol duration that is four-times as long (4x) as a standard OFDM symbol duration, and the operations configure the HEW communication station to: process the longer-duration OFDM symbols for a single user station using the 512-point FFT for communication within a 40 MHz resource allocation unit; process the longer-duration OFDM symbols for a single user station using the 1024-point FFT for communication within an 80 MHz resource allocation unit; and process the longer-duration OFDM symbols for two user stations using the 512-point FFT for communication within an 80 MHz resource allocation unit.
  • BCC binary convolutional code
  • the longer-duration OFDM symbols have a symbol duration that is four-times as long (4x) as a standard OFDM symbol duration, and the operations further configure the HEW communication station to communicate the longer-duration OFDM symbols comprising one or more resource allocation units in accordance with a non-contention based

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  • Mathematical Physics (AREA)
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Abstract

Conformément à des modes de réalisation, la présente invention concerne d'une manière générale une station de communication de haute efficacité (HE) et un procédé pour une communication HE dans un réseau sans fil. La station de communication HE peut communiquer des symboles de multiplexage par répartition orthogonale de la fréquence (OFDM) d'une durée 4x plus longue sur des ressources de canal conformément à une technique OFDMA. Les ressources de canal peuvent comprendre une ou plusieurs unités d'affectation de ressource, chaque unité d'affectation de ressource ayant un nombre prédéterminé de sous-porteuses de données. La station peut également configurer les unités d'affectation de ressource conformément à l'une d'une pluralité d'affectations de sous-porteuse pour l'une d'une pluralité de configurations d'entrelaceur. La station peut traiter les symboles OFDM d'une durée plus longue avec une transformation de Fourier rapide (FFT) à 512 points pour une communication sur une bande passante de canal de 40 MHz comprenant une unité d'affectation de ressource de 40 MHz, et avec une FFT à 1024 points pour une communication sur une bande passante de canal de 80 MHz comprenant soit deux unités d'affectation de ressource de 40 MHz soit une unité d'affectation de ressource de 80 MHz.
EP15809284.1A 2014-06-18 2015-06-11 Station de communication de haute efficacité (he) et procédé pour communiquer des symboles de multiplexage par répartition orthogonale de la fréquence (ofdm) d'une durée plus longue dans des affectations de bande passante de 40 mhz et 80 mhz Withdrawn EP3158702A4 (fr)

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US201462013869P 2014-06-18 2014-06-18
US201462024801P 2014-07-15 2014-07-15
US14/447,254 US20150139118A1 (en) 2013-11-19 2014-07-30 Master station and method for high-efficiency wi-fi (hew) communication with a minimum ofdma bandwidth unit
US201462039320P 2014-08-19 2014-08-19
US14/573,912 US9680603B2 (en) 2014-04-08 2014-12-17 High-efficiency (HE) communication station and method for communicating longer duration OFDM symbols within 40 MHz and 80 MHz bandwidth
PCT/US2015/035313 WO2015195460A1 (fr) 2014-06-18 2015-06-11 Station de communication de haute efficacité (he) et procédé pour communiquer des symboles de multiplexage par répartition orthogonale de la fréquence (ofdm) d'une durée plus longue dans des affectations de bande passante de 40 mhz et 80 mhz

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US9544914B2 (en) 2013-11-19 2017-01-10 Intel IP Corporation Master station and method for HEW communication using a transmission signaling structure for a HEW signal field
US9325463B2 (en) 2013-11-19 2016-04-26 Intel IP Corporation High-efficiency WLAN (HEW) master station and methods to increase information bits for HEW communication
US9680603B2 (en) 2014-04-08 2017-06-13 Intel IP Corporation High-efficiency (HE) communication station and method for communicating longer duration OFDM symbols within 40 MHz and 80 MHz bandwidth

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US7684507B2 (en) * 2004-04-13 2010-03-23 Intel Corporation Method and apparatus to select coding mode
US8059676B2 (en) * 2008-02-17 2011-11-15 Lg Electronics Inc. Method of communication using frame
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WO2015195460A1 (fr) 2015-12-23

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