JP2018503294A - Wireless apparatus, method and computer-readable medium for orthogonal frequency division multiple access (OFDMA) assignment based on basic tone resource units or subchannels - Google Patents

Abstract

A wireless device, method and computer readable medium are disclosed. A high efficiency wireless local area network (HEW) master station is disclosed. The HEW master station may have a circuit. The circuit may be configured to generate one or more resource allocations of bandwidth for one or more HEW stations. Each resource allocation of the first portion of bandwidth may be a multiple of the entire first portion of bandwidth or the basic resource allocation. There may be only one resource allocation for a second portion of bandwidth that is at least as large as the first portion of bandwidth. In some embodiments, each resource allocation for the second portion of bandwidth may be a multiple of the entire second portion of bandwidth or the base resource allocation.

Description

[Priority claim]
This application is filed on US Provisional Patent Application No. 62 / 087,173, filed Dec. 3, 2014 and Jan. 29, 2015, each of which is incorporated herein by reference in its entirety. Claims priority benefit to US patent application Ser. No. 14 / 670,924 filed Mar. 27, 2015 claiming priority benefit to US Provisional Patent Application No. 62 / 087,173.

  Embodiments relate to wireless communication in a wireless local area network (WLAN). Some embodiments relate to orthogonal frequency division multiple access (OFDMA) tone assignment designs. Some embodiments relate to bandwidth resource allocation. Some embodiments relate to resource allocation for uplink or downlink transmission opportunities. Some embodiments relate to the Institute of Electrical and Electronics Engineers (IEEE) 802.11ax standard.

  One problem with wireless local area networks (WLANs) is the efficient use of wireless networks. Often there are many devices that share a wireless medium, and it may be difficult to determine how to share the wireless medium. Furthermore, with the use of OFDMA, the wireless medium can be used simultaneously by multiple wireless devices. Further, the wireless network may support different protocols including legacy protocols.

  Accordingly, there is a general need for a system and method for determining how to allocate a wireless medium, particularly for use of OFDMA, in order to efficiently use the wireless medium.

The present disclosure is described by way of example and not limitation in the figures of the accompanying drawings in which like references indicate like elements.
FIG. 1 illustrates a wireless local area network (WLAN) according to some embodiments. FIG. 2 shows a table showing tone assignments for 2.4 GHz and 5 GHz according to some embodiments. FIG. 3 shows a table summarizing resource unit (RU) size, maximum number of allocations, unused tones and unused tones by 2 × 498 for each operational bandwidth according to some embodiments. FIG. 4 shows the configuration of a 20 MHz channel RU according to some embodiments. 5A and 5B show the configuration of a 40 MHz channel RU according to some embodiments. 6A and 6B show the configuration of an 80 MHz channel RU according to some embodiments. FIG. 7 illustrates a method for bandwidth resource allocation according to some embodiments. FIG. 8 illustrates an example resource allocation of 80 MHz bandwidth according to some embodiments. FIG. 9 illustrates an example resource allocation of 80 MHz bandwidth according to some embodiments. FIG. 10 shows a HEW device according to some embodiments.

  The following description and drawings sufficiently describe specific embodiments to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, processing and other changes. Parts and features of some embodiments may be included in or substituted for those of other embodiments. The embodiments given in the claims encompass all available equivalents of those claims.

  FIG. 1 illustrates a wireless local area network (WLAN) according to some embodiments. The WLAN includes a master station 102, which may be an access point (AP), multiple high efficiency WLAN (HEW) (eg, IEEE 802.11ax) stations 104, and multiple legacy (eg, IEEE 802.11n / ac) devices 106. A basic service set (BSS) 100 may be included.

  The master station 102 may be an AP that transmits and receives using the 802.11 communication protocol. Master station 102 may be a base station. Master station 102 may use the 802.11 protocol along with other communication protocols. The 802.11 protocol may include using orthogonal frequency division multiple access (OFDMA), time division multiple access (TDMA), and / or code division multiple access (CDMA). The 802.11 protocol may include multiple access technology. For example, the 802.11 protocol may include spatial division multiple access (SDMA) and / or multi-user (MU) multiple-input and multiple-output (MU-MIMO).

  The HEW station 104 may operate according to 802.11ax or another standard of 802.11. Legacy device 106 may operate in accordance with one or more of the 802.11a / g / n / ac standards or another legacy wireless communication standard. In the exemplary embodiment, HEW station 104 may be referred to as a high efficiency (HE) station. The legacy device 106 may be a station.

  The HEW station 104 is a wireless device such as a mobile phone, portable wireless device, wireless glasses, wireless watch, wireless personal device, tablet, or other device that can transmit and receive using 802.11 protocol or another wireless protocol such as 802.11ax. It may be a transmission / reception device.

  The BSS 100 may operate on a primary channel and one or more secondary channels or subchannels. The BSS 100 may include one or more master stations 102. According to embodiments, the master station 102 may communicate with one or more of the HEW stations 104 on one or more of the secondary channels or sub-channels or on the primary channel. In another exemplary embodiment, master station 102 communicates with legacy device 106 on a secondary channel or subchannel. In the exemplary embodiment, the master station 102 communicates with one or more of the HEW stations 104 in one or more of the secondary channels and simultaneously with a legacy device 106 that uses only the primary channel without using the secondary channel. It may be configured as follows. In the exemplary embodiment, master station 102 may communicate with one or more of HEW stations 104 in one or more of the secondary channels and simultaneously with legacy device 106 in the primary and secondary channels.

  Master station 102 may communicate with legacy device 106 according to legacy IEEE 802.11 communication technology. In the exemplary embodiment, master station 102 may be configured to communicate with HEW station 104 according to legacy IEEE 802.11 communication technology. Legacy IEEE 802.11 communication technology may refer to any IEEE 802.11 communication technology prior to IEEE 802.11.

  In some embodiments, HEW frames can be configured to have the same bandwidth, and the bandwidth can be 20 MHz, 40 MHz, 80 MHz, 160 MHz, or 320 MHz continuous bandwidth or 80 + 80 MHz (160 MHz) discontinuous. One of the bandwidths may be sufficient. In some embodiments, 78.125 KHz may be used for the subcarrier spacing, which may provide 256 subcarriers or tones for a 20 MHz bandwidth. In some embodiments, bandwidths of 20 MHz (256 tones), 2.03125 MHz (26 tones), 4.0625 MHz (52 tones), 8.125 MHz (104 tones), and 18.90625 (242 tones) or these Combinations may also be utilized. In some embodiments, the bandwidth may vary depending on the number of tones used. In some embodiments, different bandwidths may be used that may be less than 320 MHz. For example, only 102 data tones out of 104 tones may be used and some of the remaining tones may be used for pilots, e.g. 4, 5 or 6 tones are used for pilots May be. At this time, in the exemplary embodiment, the accurate bandwidth is 102 data + 4 pilots = 106 × 78.125 KHz = 8.228125 MHz, 102 data + 5 pilots = 107 × 78.125 KHz = 8.359375 MHz, and 102 data + 6. Pilot = 108 × 78.125 KHz = 8.4375 MHz. The HEW frame may be configured to transmit multiple spatial streams.

  In other embodiments, the master station 102, the HEW station 104, and / or the legacy device 106 may also be CDMA2000, CDMA2000 1X, CDMA2000 EV-DO, Interium Standard 2000 (IS-2000), Intermium Standard 95 (IS-95), Interim Standard 856 (IS-856), Long Term Evolution (LTE), Global System for Mobile communications (GSM (registered trademark)), Enhanced Data rate E GED E, E G 80 E , World Intero erability for Microwave Access (WiMAX)), BlueTooth (may implement a different technology, such as registered trademark) or other technology.

  In an exemplary embodiment, if the master station 102 transmits a beacon only on the primary channel, the HEW station 104 and the legacy device 106 maintain the beacon in order to maintain their synchronization with the system (eg, the master station 102). It is necessary to receive a beacon on the primary channel every multiple of the interval (eg, every beacon interval, every 10 beacon intervals).

  In an exemplary embodiment, HEW station 104 and / or master station 102 may generate bandwidth resource allocations, send resource allocations to HEW station 104, receive resource allocations, and perform according to resource allocations, etc. 8 is configured to perform the functions described in conjunction with FIG.

  Some embodiments relate to high efficiency wireless communications, including high efficiency WLAN (HEW) communications. According to some IEEE 802.11ax (HEW) embodiments, the master station 102 receives exclusive control of the medium in a HEW control period (ie, transmission opportunity (TXOP)) (eg, during a contention period). It may operate as a master station that may be configured to compete for wireless media. The master station 102 may transmit a trigger frame at the beginning of the HEW control period. The master station 102 may transmit a time duration of TXOP. During the HEW control period, the HEW station 104 may communicate with the master station 102 according to a non-contention based multiple access technique. This is different from conventional WLAN communication where devices communicate according to contention based communication technology rather than multiple access technology. During the HEW control period, the master station 102 may communicate with the HEW station 104 using one or more HEW frames. During the HEW control period, the legacy device 106 may refrain from communication. In some embodiments, the trigger frame may be referred to as HEW control and schedule transmission.

  In some embodiments, the multiple access technique used during the HEW control period may be a scheduling OFDMA technique, but this is not a requirement. In some embodiments, the multiple access technology may be MU-MIMO. In some embodiments, the multiple access technology may be a combination of OFDMA technology and MU-MIMO technology. In some embodiments, the multiple access technology may be TDMA technology or FDMA technology. In some embodiments, the multiple access technique may be an SDMA technique.

  Master station 102 may also communicate with legacy device 106 in accordance with legacy IEEE 802.11 communication technology. In some embodiments, the master station 102 may also be configured to communicate with the HEW station 104 outside of the HEW control period in accordance with legacy IEEE 802.11 communication technology, but this is not a requirement.

  FIG. 2 shows a table 200 showing 2.4 GHz and 5 GHz tone assignments according to some embodiments. For the 20 MHz 208, 40 MHz 210, and 80 MHz 212 subcarriers, the Fast Fourier Transform (FFT) size 202, DC and edge tones (DC + EDGE) 204 and available tones are shown in FIG. The tone assignment may be the same for both 2.4 GHz and 5 GHz 214. In some embodiments, the number of tones assigned to DC + EDGE 204 may be a different number of tones.

  FIG. 3 illustrates unused tons 314 with resource unit (RU) size 308, maximum allocated number 310, unused tones 312 and 2 × 498 for each bandwidth 322 including 20 MHz 316, 40 MHz 318 and 80 MHz 320 according to some embodiments. A summarized table 300 is shown. 3 also shows the FFT size 302, DC + EDGE 304, and available tones 306 for each bandwidth 322. FIG.

  The RU size 308 indicates the RU size 308 that can be allocated to the bandwidth 322. For 20 MHz 316, the RU size 308 is 26, 52, 104 and 242 tones. For 40 MHz 318, the RU size 308 is 26, 52, 104, 242, and 498 tones. For 80 MHz 320, the RU size 308 is 26, 52, 104, 242, 498 and 996 tones. The maximum allocation number 310 indicates the maximum number of HEW stations 104 to which RUs can be allocated for the bandwidth 322. The following shows how the maximum number of HEW stations 104 can be implemented for different bandwidths 322. For 20 MHz 316, each of the nine HEW stations 104 may be assigned 26 tones. For 40 MHz 318, nine HEW stations 104 may each be assigned 26 tones, and one HEW station 104 may be assigned 242 tones. For 80 MHz 320, nine HEW stations 104 may each be assigned 26 tones, one HEW station 104 may be assigned 242 tones, and one HEW station 104 may be assigned 498 tones.

  The unused tone 312 indicates the number of unused tones when RU sizes of 26, 52, 104, and 242 are used. The unused tone 314 2 × 498 indicates the number of unused tones when two 498RUs are used.

  FIG. 4 illustrates the configuration of a 20 MHz channel 400 RU according to some embodiments. A tone index 402 is shown along the horizontal axis, and usable tones 404 and different RU configurations are shown along the vertical axis.

  The usable tone 404 indicates a tone available for the RU. The 26 tone RU 406 is a tone configuration in which nine 26 tone RUs exist. There are four 26 tone RUs on either side of the 0 tone index 402 and one 26 tone RU straddling the 0 tone index 402. The black line 414 shows 8 interlaced null subcarriers between 8 26 tone RUs. The 52 tone RU and one 26 tone RU 408 is another tone configuration in which there are four 52 tone RUs and one 26 tone RU. The black line 416 shows two nulls between 52 tone RUs. The 104 tone RU and one 26 tone RU are different tone configurations where there are two 204 tone RUs and one 26 tone RU. The black line 418 may be four nulls between 104 tone RU and the central 26 ton R. The 242 tone RU 412 is another tone structure in which there is one 242 tone RU with a null in the middle at the 0 tone index 402. One skilled in the art will recognize that a different number of nulls can be used.

  In an exemplary embodiment, the resource assignment may include 1-9 RUs from a 20 MHz channel. The resource allocation may include 9 RUs, all 9 being 26 tone RUs 406. The resource allocation may include 7 RUs with 5 26 tone RUs 406 and 2 52 tone RUs. The resource allocation may include 6 RUs with 5 26 tone RUs and 1 104 tone RU. The resource assignment may include one 242 tone RU 412. In exemplary embodiments, nulls may be distributed differently, and there may be fewer or more nulls.

  5A and 5B show the configuration of a 40 MHz channel 500, 550 RU according to some embodiments. Tone index 502 is shown along the horizontal axis, and different RU configurations are shown along the vertical axis. In FIG. 5A, the configuration of a 40 MHz channel 500 RU that may include two 20 MHz channels 514, 516 is shown. In the exemplary embodiment, one of the 20 MHz channels 514, 516 has one of the 20 MHz channel 400 RU configurations described with reference to FIG. 4 and the other 20 MHz channel 514, 516 has one 242. A tone RU 504 may be included. The 40 MHz channel 500 RU configuration may include one 498 tone RU 506 with a null 510 in the middle. In the exemplary embodiment, both 20 MHz channels 514, 516 may have the configuration of the 20 MHz channel 400 RU described with reference to FIG.

  In the exemplary embodiment, the maximum RU for a 40 MHz channel is 10, which is a maximum of 9 RUs for the 20 MHz channel described with reference to FIG. 4 and one 242 tone RU 504 with a null 508 in the middle. Including. There may be a null 510 between the RU configuration of the 20 MHz channel 400 and the 242 tone RU 504.

  In FIG. 5B, the configuration of a 40 MHz channel 550 RU is shown. Available tone 554 indicates the available tones for the RU. The 26 tone RU 556 is a tone configuration in which 18 26 tone RUs exist. There may be four 26 tone RUs on one side of the 26 tone RU in the middle 564 for each of the two 20 MHz channels 514, 516. The interlaced null subcarriers and / or pilot tones may be part of or between 18 26 tone RU556s. The 52 tone RU and the 26 tone RU 558 are tone configurations with two 52 tone RUs on one side of the 26 tone RU 564 for each of the two 20 MHz channels 514, 516. The interlaced null subcarrier and / or pilot tone may be part of or between eight 52 tone RUs and two 26 tone RUs 564. The 104 tone RU and 26 tone RU 560 are tone configurations with two 104 tone RUs on one side of the 26 tone RU 564 for each of the two 20 MHz channels 514, 516. The interlaced null subcarrier and / or pilot tone may be part of or between four 104 tone RUs and two 26 tone RUs 564. The 242 tone RU 562 is a tone configuration having two 242 tone RUs. Interlaced null subcarriers and / or pilot tones may be part of or between two 242 tone RU562s. The 498 tone RU 568 is a tone structure having one 498 tone RU 568. The interlaced null subcarrier and / or pilot tone may be part of a 498 tone RU564.

  6A and 6B illustrate RU configurations for 80 MHz channels 600, 650 according to some embodiments. A tone index 602 is shown along the horizontal axis and different RU configurations are shown along the vertical axis. In FIG. 6A, a configuration for an 80 MHz channel 600 RU that may include two 40 MHz channels 608, 610 is shown. In an exemplary embodiment, one of the 40 MHz channels 608,610 may have one of the 40 MHz channel 500,550 RU configurations described with respect to FIGS. 5A and 5B, and the other 40 MHz channel 608,610. May have one 498 tone RU 604. In the exemplary embodiment, both 40 MHz channels 608, 610 may have the RU configuration of 40 MHz channels 500, 550 described in FIGS. 5A and 5B. The configuration of an 80 MHz channel 600 RU may have one 996 tone RU 606 with a null 612 in the middle.

  In the exemplary embodiment, the maximum RU of the 80 MHz channel is 11, which is the maximum of 9 RUs of the 20 MHz channel described with reference to FIG. 4 and the 1 described with reference to FIG. 5A. One 242 tone RU 504 and one 498 tone RU 604. There may be a null 612 between the RU configuration of the 40 MHz channel 500 and the 498 tone RU 604.

  The configuration for an 80 MHz channel 600 RU may be easily scaled for use at 160 MHz or 80 + 80 channel widths, with the next 80 MH being a complete 80 MHz channel or an entire 160 MHz channel.

  In FIG. 6B, a configuration for an 80 MHz channel 650 RU is shown. The usable tone 654 indicates a tone available for the RU. The 26 tone RU 656 is a tone structure having 37 26 tone RUs. The interlaced null subcarriers and / or pilot tones may be part of or between 37 26-tone RU 654s.

  52 tone RU and 26 tone RU 658 are tone configurations with 16 52 tone RUs and 5 26 tone RUs with one 26 tone RU 652 in the center. The interlaced null subcarriers and / or pilot tones may be part of or between eight 104 tone RUs and five 26 tone RUs 660.

  The 242 tone RU and the 26 tone RU 662 are tone configurations having four 242 tone RUs and one 26 tone RU 652.

  The interlaced null subcarriers and / or pilot tones may be part of or between four 242 tone RU 662 and 26 tone RU 652. The 498 tone RU and the 26 tone RU 664 are tone configurations having two 498 tone RUs and one 26 tone RU 652. Interlaced null subcarriers and / or pilot tones may be part of two 498 tone RUs and one 26 tone RU 652. The 996 tone RU 666 is a tone structure having one 996 tone RU. Interlaced null subcarriers and / or pilot tones may be part of 996 tone RU666. One skilled in the art will recognize that the number of tones may be variable depending on how many tones are used for the null subcarrier and pilot tones.

  FIG. 7 illustrates a method 700 for bandwidth resource allocation according to some embodiments. Method 700 begins with operation 702 generating a resource allocation for a first portion of bandwidth where each resource allocation is a multiple of the base resource allocation or the entire first portion. For example, the master station 102 may determine resource allocation for OFDMA tone allocation for multi-user processing in 802.11ax, which may be an uplink or downlink multi-user transmission opportunity.

  The waveform is 4 times (4x) longer than the existing IEEE 802.11 OFDMA waveform (VHT, HT or non-HT) defined in the existing IEEE 802.11 standard, such as the standard IEEE 802.11a / g / n / ac. May be processed. For example, the waveform may be between 13.2 milliseconds (μs) and 16 μs.

  The legacy symbol duration may be any of the following: 3.2 μs + 0.4 μs = 3.6 μs for a short cyclic prefix (CP) and 3. μs + 0. μs = 4 μs. Four times the legacy symbol duration may be one of the following: (3.2) × 4 + 0.4 = 13.2 μs for short CPs and (3.2) × 4 + for long CPs. (0.8 × 4) = 16 μs. A 1024 point Fast Fourier Transform (FFT) may be used with a 4 × 11 n / ac symbol duration and may be used in both outdoor and indoor environments. In an exemplary embodiment, in outdoor environments, four times longer symbol durations allow for more efficient use of CP to overcome longer delay spreads, and in indoor environments, the clock timing accuracy is less gradual. Enable the requirements.

  The basic resource allocation may be 26 tones. The resource assignment may be one of the resource assignments configured for the RU of the 20 MHz channel 400 (FIG. 4). For example, the resource assignment may be nine 26 tone resource assignments, four 52 tone assignments, and so on. The resource allocation may also be a full bandwidth of 242 tones. The OFDMA assignment may have a fixed location as shown in FIGS. 4, 5A, 5B, 6A and 6B.

  The method 700 continues to process 704 where it is determined if there are more parts of the allocated bandwidth. If there are more portions of the bandwidth to be allocated, the method 700 proceeds to operation 706 and generates a resource allocation for the next portion of bandwidth. In the exemplary embodiment, the bandwidth of the next portion is at least the same as the bandwidth of all previous assignments combined. For example, the allocated bandwidth may be 20 MHz, 40 MHz, 80 MHz, 160 MHz or other bandwidth value. The bandwidth may be 80 MHz, in which case the next portion may be for the next 20 MHz channel 516 (FIG. 5A), which may be a 242 tone RU 504, or the entire 40 MHz channel may be 498. Tone RU 506 may be assigned. The next 20 MHz channel 516 assignment is at least as large as any assignment in the first 20 MHz channel 514, and the 242 tone RU 504 is the smallest in the next 20 MHz channel 516 and the largest assignment in the first 20 MHz channel 514. This is because 242 tone.

  In the exemplary embodiment, the next portion allocation is a multiple of the basic resource allocation or the entire bandwidth of the next portion. For example, the basic resource allocation is 26 tones, 52 tones, 104 tones or 242 tones for a bandwidth equal to 20 MHz, 26 tones, 52 tones, 104 tones, 242 tones or 498 tones for a bandwidth equal to 40 MHz, a band equal to 80 MHz. It may be 26 tones, 52 tones, 104 tones, 242 tones, 498 tones or 996 tones for width.

  The method 700 may return to process 704 to determine if there are more portions of bandwidth to allocate. There may be another 40 MHz channel 610 to be allocated, as shown in FIG. 6A. The method 700 may continue to process 706 generating a resource allocation for the next portion of bandwidth. In the exemplary embodiment, the next portion of bandwidth is at least as large as the bandwidth of all previous allocations combined. The resource allocation available for the second 40 MHz channel 610 is one 996 tone RU 606 for the entire 80 MHz channel, both of which are at least as large as either resource allocation for the first 40 MHz channel 608 or 498 tone RU604. In the exemplary embodiment, the next portion allocation is a multiple of the basic resource allocation or the total bandwidth of the next portion.

  The method 700 may return to process 704 to determine if there are more portions of bandwidth to allocate. If there are no more portions of bandwidth to be allocated, then in this case, method 700 continues to process 708 for transmitting resource allocations. For example, the master station 102 may send resource assignments to one or more HEW stations 104. In the exemplary embodiment, master station 102 may determine the size of the resource allocation based on the number of HEW stations 104 associated with master station 102. In the exemplary embodiment, there may have been more portion of the allocated bandwidth. For example, the bandwidth may be 160 MHz or 320 MHz.

  The illustrative embodiment provides a limited number of multiplexed users in each bandwidth. For example, in FIG. 4, a 20 MHz BSS provides up to 9 users, in FIGS. 5A and 5B, a 40 MHz BSS provides up to 10 users, and in FIGS. 6A and 6B, an 80 MHz BSS provides 11 users. Provide users up to. In an exemplary embodiment, a 160 MHz BSS (not shown) may provide up to 12 users, and a 320 MHz BSS (not shown) may provide up to 13 users.

  FIG. 9 illustrates an example resource allocation 800 for an 80 MHz bandwidth 804 according to some embodiments. In FIG. 8, 80 MHz bandwidth 804, 20 MHz channel 806, 20 MHz channel 808, 40 MHz channel 810, tone index 802 and RU assignments 812, 814, 816, 818, 820, 822 are shown.

  The RU assignment 812 may include nine 26 tone resource assignments as shown in the 26 tone RU 406 (FIG. 4). RU assignment 814 may include two 52 tone resource assignments, as shown in 52 tone RU 408. The RU assignment 816 may be a 26 tone assignment such as the central 26 tone RU shown in FIG. RU assignment 818 may be a 104 tone assignment as shown in 104 tone RU 410. The RU assignment 820 may be a 26 tone assignment. The RU assignment 822 may be two 242 tone assignments such as the 242 tone RU 504 (FIG. 5A).

  FIG. 9 illustrates an example resource allocation 900 for an 80 MHz bandwidth 922 according to some embodiments. In FIG. 9, an 80 MHz bandwidth 922, 40 MHz channel 916, 20 MHz channel 918, 20 MHz channel 920, tone index 902 and RU assignments 904, 906, 907, 908, 910, 912, 914 are shown.

  The RU assignment 904 is a 40 MHz wide RU, such as that shown for the 40 MHz channel 608 (FIG. 6A). The RU assignment 906 may be a 26 tone RU. The RU assignment 907 includes two 26 tone RUs such as a 26 tone RU 406 (FIG. 4), and the RU assignment 908 is a 52 tone RU such as a 52 tone RU 408. The RU assignment 910 is a 26 tone assignment such as a 26 tone RU straddling 0 in FIG. RU assignment 912 is a 104 tone RU, such as 104 tone RU 410. The RU assignment 914 is a 242 tone assignment such as a 242 tone RU 412.

  Next, the bandwidth of the 20 MHz channel 918 may be divided into two 26 tone RUs from the 26 tone RU 406, one 52 tone RU and one 26 tone RU 408, and one 104 tone RU 410.

  FIG. 10 illustrates a HEW device 1000 according to some embodiments. HEW device 1000 communicates with one or more HEW devices such as HEW station 104 (FIG. 1) or master station 102 (FIG. 1) and is compliant with HEW that can be configured to communicate with legacy device 106 (FIG. 1). It may be a device that has been used. HEW station 104 and legacy device 106 may also be referred to as HEW station (STA) and legacy STA, respectively. According to an embodiment, the HEW device 1000 may be suitable to operate as the master station 102 (FIG. 1) or the HEW station 104 (FIG. 1). According to an embodiment, the HEW device 1000 may include a transceiver element 1001 such as an antenna, a transceiver 1002, a physical layer circuit (PHY) 1004, and a medium access control layer circuit (MAC) 1006, among others. The PHY 1004 and MAC 1006 may be HEW compliant layers, and may be compliant with one or more legacy IEEE 802.11 standards. The MAC 1006 may in particular be configured to constitute a physical protocol data unit (PPDU) and to send and receive PPDUs. The HEW device 1000 may also include other circuitry 1008 and memory 1010 configured to perform the various processes described herein. The circuit 1008 may be a hardware processing circuit. The circuit 1008 may be coupled to a transceiver 1002 that may be coupled to the transceiver element 1001. Although FIG. 10 shows the circuit 1008 and the transceiver 1002 as separate components, the circuit 1008 and the transceiver 1002 may be integrated into an electronic package or chip.

  In some embodiments, the MAC 1006 may be configured to contend for the wireless medium during the contention period to receive control of the medium during the HEW control period and to configure the HEW PPDU. In some embodiments, the MAC 1006 may be configured to contend for the wireless medium based on channel contention settings, transmit power levels, and clear channel assessment (CCA) levels.

  The PHY 1004 may be configured to send HEW PPDUs. The PHY 1004 may include circuits for modulation / demodulation, upconversion / downconversion, filtering, amplification, and the like. In some embodiments, circuit 1008 may include one or more processors. Circuit 1008 may be configured to perform functions based on instructions stored in RAM or ROM, or based on dedicated circuitry. In some embodiments, circuit 1008 may be configured to perform one or more of the functions described herein in connection with FIGS.

  In some embodiments, two or more antennas 1001 may be coupled to the PHY 1004 and configured to transmit and receive signals including transmission of HEW packets. The transceiver 1002 may transmit and receive data such as HEW PPDUs and packets, including an indication that the HEW device 1000 should adapt the channel contention settings according to the settings included in the packets. Memory 1010 performs the functions described in connection with FIGS. 1-10, such as generating bandwidth resource assignments, sending resource assignments to HEW station 104, receiving resource assignments, and operating in accordance with resource assignments. Information for setting other circuits may be stored.

  In some embodiments, HEW device 1000 may be configured to communicate using OFDMA communication signals over a multi-carrier communication channel. In some embodiments, the scope of the disclosed embodiments is not limited thereto, but the HEW device 1000 may be an IEEE 802.11-2012, 802.11n-2009, 802.11ac-2013, 802.11ax, DensiFi, The HEW may be configured to communicate according to one or more specific communication standards, such as an IEEE standard, including a base station for a WLAN and / or a proposed specification or other standard described in connection with FIG. The apparatus 1000 may also be suitable for transmitting and / or receiving communications in accordance with other technologies and standards. In some embodiments, HEW device 1000 may utilize 802.11n or 802.11ac 4 × symbol duration.

  In some embodiments, the HEW device 1000 is a personal digital assistant (PDA) with a wireless communication capability, a laptop or portable computer, a web tablet, a wireless phone, a smartphone, a wireless headset, a pager, an instant messaging device, a digital Wirelessly receiving and / or transmitting cameras, access points, televisions, medical devices (eg, heart rate monitors, blood pressure monitors, etc.), base stations, transceiver devices or information for wireless standards such as 802.11 or 802.16 It may be part of a portable wireless communication device such as another device. In some embodiments, the portable wireless communication device includes one or more of a keyboard, display, non-volatile memory port, multiple antennas 1001, graphics processor, application processor, speakers, and other mobile device elements. There may be. The display may be an LCD screen including a touch screen.

  The antenna 1001 includes one or more directional or omnidirectional antennas including, for example, a dipole antenna, a monopole antenna, a patch antenna, a loop antenna, a microstrip antenna, or other type of antenna suitable for transmitting RF signals. May be included. In some multiple-input multiple-output (MIMO) embodiments, the antennas 1001 may be effectively separated to obtain the effect of the resulting spatial diversity and different channel characteristics.

  Although the HEW device 1000 is shown as having several separate functional elements, one or more of the functional elements may be combined and configured by software such as processing elements including a digital signal processor (DSP). May be realized by a combination of configured elements and / or other hardware elements. For example, some elements may include one or more microprocessors, DSPs, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), radio frequency integrated circuits (RFICs) and at least the functions described herein. A logic circuit to be executed may be included. In some examples, a functional element may refer to one or more processes that are executed on one or more processing elements.

  The following examples relate to further embodiments. Example 1 is a high efficiency wireless local area network (HEW) master station. The HEW master station generates one or more resource allocations of bandwidth for one or more HEW stations, where each resource allocation of the first portion of bandwidth is a multiple or bandwidth of the basic resource allocation The entire first portion of the width may include circuitry configured to transmit one or more resource assignments and durations to one or more HEW stations. The one or more resource assignments may be for one of the following groups: one for downlink data transmission and uplink transmission opportunity from the HEW master station at a time based on duration. The circuit may be further configured to operate according to orthogonal frequency division multiple access (OFDMA) and according to one or more resource assignments.

  In Example 2, the subject matter of Example 1 optionally includes each of the one or more resource allocations in the following groups: 26 tones, 52 tones, 104 tones and 242 tones for a bandwidth equal to 20 MHz. One of 26 tones, 52 tones, 104 tones, 242 tones and 498 tones with a bandwidth equal to 40 MHz and 26 tones, 52 tones, 104 tones, 242 tones, 498 tones and 996 tones with a bandwidth equal to 80 MHz Can be included.

  In example 3, subject matter of example 1 or 2 optionally includes the case where one or more resource allocations include one or more resource allocations for one or more subsequent portions of bandwidth, Each of the one or more resource allocations for the one or more subsequent portions may be a multiple of the basic resource allocation or the full bandwidth of the subsequent portion of the bandwidth.

  In Example 4, the subject matter of any of Examples 1-3 optionally specifies that one or more resource allocations are for a second portion of bandwidth that is at least as large as the first portion of bandwidth. It can include cases involving at most one resource allocation.

  In example 5, the subject of example 4 is optionally the case where the basic resource allocation is 26 tones, the first part of the bandwidth is 20 MHz, and the second part of the bandwidth is 20 MHz. Can be included.

  In example 6, the subject matter of example 1 is optionally only one for the third part of the bandwidth that is at least the same as the bandwidth of the first and second parts of the synthesized bandwidth. And the third part of the bandwidth can be 40 MHz.

  In example 7, the subject matter of example 1 optionally includes a bandwidth first that is at least as large as the bandwidth of the first, second, and third portions of the combined bandwidth. There may be a case where there is only one resource allocation for the 4 parts and the fourth part of the bandwidth is 80 MHz.

  In Example 8, the subject of Example 5 is optionally that each of the one or more resource assignments for one or more HEW stations for the first portion of bandwidth is in the following groups: 9 26 tone assignments; four 26 tone assignments on the first side of the first part, one 26 tone assignment across the null, and two 52 tone assignments on the second side of the first part; Four 26-tone assignments on the first side of the first part, one 26-tone assignment across the null, and one 104-tone assignment on the second side of the first part; one across the null 26 tone assignments and four 52 tone assignments; one 26 tone assignment across the null, two 52 tone assignments on the first side of the first part, and on the second side of the first part 1 of 1 May include where one 26 tone allocation across a null, including one of the two 104 tone allocation and one 242 tone allocation; 4 tone allocation.

  In Example 9, the subject of Example 8 is optionally that each of the one or more resource assignments for one or more HEW stations for the first portion of bandwidth and the second portion of bandwidth is , The resource allocation for 20 MHz in the first part of the bandwidth, the one 242 tone assignment in the second part of the bandwidth, the first part of the bandwidth and the bandwidth number. It may include the case of including one with a single resource allocation of 498 tones spanning both of the two parts.

  In Example 10, the subject matter of Example 1 optionally includes each of one or more resource allocations for one or more HEW stations for a first portion of bandwidth and a second portion of bandwidth. , Including one of the following groups: a 20 MHz resource allocation in the first part of the bandwidth and a 242 tone allocation in the second part of the bandwidth, One or more resources for a first part, a second part, and a third part of 40 MHz, including one with a single resource allocation of 484 tones, both with a second part of the bandwidth Each of the assignments is one of the following groups: resource assignments for the first and second parts, one 498 tone assignment, and a single resource assignment of 996 tones It can include a case that contains.

  In example 11, the subject matter of any of examples 1-10 can optionally include the case where the bandwidth is part of the 2.4 GHz range or part of the 5 GHz range.

  In example 12, the subject matter of any of examples 1-11 includes the case where the circuit is optionally configured to transmit at a symbol duration that is four times longer than the legacy 4 microsecond (μs) symbol duration. be able to.

  In example 13, the subject matter of any of examples 1-12 can optionally include a memory coupled to the circuit.

  In embodiment 14, the subject matter of any of embodiments 1-13 can optionally include one or more antennas coupled to the circuit.

  Example 15 is a method performed on a high efficiency wireless local area network (HEW) master station. The method includes generating one or more resource allocations of bandwidth for one or more HEW stations, wherein each resource allocation for a first portion of bandwidth is a multiple or bandwidth of a basic resource allocation. The first part of, including transmitting one or more resource assignments and durations to one or more HEW stations. The method may further include transmitting and receiving with one or more HEW stations respectively according to downlink data transmission or uplink transmission opportunities from the HEW master station at a duration based time. The transmission or reception may be according to orthogonal frequency division multiple access (OFDMA) and according to one or more resource assignments.

  In example 16, the subject of example 15 is optionally that each of the one or more resource allocations is in the following groups: 26 tones, 52 tones, 104 tones and 242 tones for a bandwidth equal to 20 MHz. One of 26 tones, 52 tones, 104 tones, 242 tones and 498 tones with a bandwidth equal to 40 MHz and 26 tones, 52 tones, 104 tones, 242 tones, 498 tones and 996 tones with a bandwidth equal to 80 MHz Can be included.

  In Example 17, the subject matter of Example 15 or 16 optionally includes one or more resource allocations including one or more resource allocations for one or more subsequent portions of bandwidth, wherein one of the bandwidths Each of the one or more resource allocations for the subsequent portion may include a multiple of the basic resource allocation or the full bandwidth of the subsequent portion of the bandwidth.

  In embodiment 18, the subject matter of any of embodiments 15-17 optionally relates to a second portion of bandwidth at least one resource allocation of which is at least as large as the first portion of bandwidth. It can include cases involving at most one resource allocation.

  In example 19, the subject of example 18 is optionally the case where the basic resource allocation is 26 tones, the first part of the bandwidth is 20 MHz, and the second part of the bandwidth is 20 MHz. Can be included.

  Example 20 is a high efficiency wireless local area network (HEW) station. The HEW station may include circuitry configured to receive one or more resource allocations of bandwidth and duration. Each resource allocation of the first portion of bandwidth may be a multiple of the basic resource allocation or the entire first portion of bandwidth. The circuit may be further configured to transmit to and receive from the HEW master station according to a downlink data transmission or uplink transmission opportunity from the HEW master station at a time based on duration, said transmission and reception being orthogonal frequency division multiple access (OFDMA). ) And according to one or more resource allocations.

  In example 21, the subject of example 20 optionally includes each of the one or more resource allocations in the following groups: 26 tones, 52 tones, 104 tones and 242 tones for a bandwidth equal to 20 MHz. One of 26 tones, 52 tones, 104 tones, 242 tones and 498 tones with a bandwidth equal to 40 MHz and 26 tones, 52 tones, 104 tones, 242 tones, 498 tones and 996 tones with a bandwidth equal to 80 MHz Can be included.

  In example 22, the subject matter of example 20 or 21 is that, optionally, one or more resource allocations are at most one for a second portion of bandwidth that is at least as large as the first portion of bandwidth. A case involving one resource allocation can be included.

  In embodiment 23, the subject matter of any of embodiments 20-22 can optionally include a memory coupled to the circuit and one or more antennas coupled to the circuit.

  Example 24 is a non-transitory computer readable storage medium that stores instructions for execution by one or more processors of a high efficiency (HE) wireless local area network (WLAN) (HEW) device. The instructions may configure one or more processors to generate one or more resource allocations of bandwidth for one or more HEW stations in the HEW device, the first part of the bandwidth Each resource allocation for is a multiple of the basic resource allocation or the entire first portion of bandwidth, and only one resource allocation for a second portion of bandwidth at least as large as the first portion of bandwidth There is.

  In example 25, the subject of example 24 is optionally where the basic resource allocation is 26 tones, the first part of the bandwidth is 20 MHz, and the second part of the bandwidth is 20 MHz. Can be included.

The summary requires a summary that allows the reader to confirm the nature and gist of the technical disclosure. F. R. Provided to comply with Section 1.72 (b). It is submitted with the understanding that it will not be used to limit or interpret the scope or meaning of the claims. The following claims are included in the detailed description, with each claim standing on its own as a separate embodiment.

Claims (28)

A wireless device configured for high efficiency (HE) processing comprising:
Memory,
A processing circuit;
Have
The processing circuitry is configured to receive a trigger frame within a transmission opportunity (TXOP), the trigger frame for transmitting uplink data in the TXOP by a plurality of HE stations (STAs) including the wireless device. A resource unit assignment, wherein the assignment comprises a single resource unit assignment of the wireless device;
The resource units allocated by the trigger frame include any combination of 26 tone resource units with 2 pilot tones, 52 tone resource units with 4 pilot tones, or 106 tone resource units with 4 pilot tones,
The resource unit is configured in an orthogonal frequency division multiple access (OFDMA) block;
The wireless apparatus configured to generate an uplink data unit according to the single resource unit assignment for transmission in the OFDMA block during the TXOP period in response to the trigger frame.   When the resource units are allocated within a 20 MHz OFDMA block, the resource units are up to 9 26 tone resource units with 2 pilot tones, up to 4 52 tone resource units with 4 pilot tones and 4 2. The apparatus according to claim 1, comprising up to two 106 tone resource units having one pilot tone, wherein the trigger frame includes signaling for assigning a single resource unit to each HE STA of the plurality of HE STAs. Wireless device.   The resource unit allocated in the OFDMA block is any one of two or more of a 26 tone resource unit having 2 pilot tones, a 52 tone resource unit having 4 pilot tones, or a 106 tone resource unit having 4 pilot tones The wireless device according to claim 2, comprising a combination of: When the resource units are allocated within a 40 MHz OFDMA block, the resource units are up to 18 26 tone resource units with 2 pilot tones, up to 8 52 tone resource units with 4 pilot tones, 4 Including up to 4 106 tone resource units with one pilot tone and up to 2 242 tone resource units with 8 pilots,
The wireless device according to claim 2, wherein the trigger frame includes signaling for assigning a single resource unit to each HE STA of the plurality of HE STAs. When the resource units are allocated within an 80 MHz OFDMA block, the resource units are up to 37 26 tone resource units with 2 pilot tones, up to 16 52 tone resource units with 4 pilot tones, 4 Including up to 8 106 tone resource units with 8 pilot tones, up to 4 242 tone resource units with 8 pilots, and up to 2 484 tone resource units with 16 pilots;
The wireless device according to claim 2, wherein the trigger frame includes signaling for assigning a single resource unit to each HE STA of the plurality of HE STAs.   The wireless device according to claim 2, wherein the trigger frame triggers a response including transmission of the uplink data unit.   The processing circuit further transmits within the TXOP as part of one or more uplink multi-user data units according to one of MU-MIMO (Multi-User Multiple-Input Multiple-Output) or OFDMA technology, The wireless device of claim 6, configured to generate the uplink data unit. The wireless device is a HE STA, further comprising a transceiver circuit configured to receive the trigger frame and transmit the uplink data unit according to the single resource allocation for the wireless device;
The wireless device of claim 1, wherein the processing circuit is configured to decode the trigger frame to determine a tone configuration of the single resource unit assignment for transmission of the uplink data unit.   9. The wireless device of claim 8, further comprising one or more antennas coupled to the transceiver circuit. A non-transitory computer readable storage medium storing instructions for execution by one or more processors of a wireless device configured for high efficiency (HE) processing,
The instructions configure the wireless device to perform a process of receiving a trigger frame within a transmission opportunity (TXOP), the trigger frame being included in the TXOP by a plurality of HE stations (STAs) including the wireless device. An allocation of resource units for uplink data transmission, the allocation comprising a single resource unit allocation of the wireless device;
The resource unit allocated by the trigger frame is a 26 tone resource unit having 2 pilot tones, a 52 tone resource unit having 4 pilot tones, a 106 tone resource unit having 4 pilot tones, or 242 having 8 pilot tones. Including any combination of tone resource units,
The resource unit is configured in an orthogonal frequency division multiple access (OFDMA) block;
The instructions cause the wireless device to perform processing to generate an uplink data unit according to the single resource unit assignment for transmission in the OFDMA block during the TXOP in response to the trigger frame. A computer-readable storage medium to be set.   When the resource units are allocated within a 20 MHz OFDMA block, the resource units are up to 9 26 tone resource units with 2 pilot tones, up to 4 52 tone resource units with 4 pilot tones and 4 11. The apparatus according to claim 10, comprising up to two 106 tone resource units having one pilot tone, wherein the trigger frame includes signaling for assigning a single resource unit to each HE STA of the plurality of HE STAs. Computer-readable storage medium. When the resource units are allocated within a 40 MHz OFDMA block, the resource units are up to 18 26 tone resource units with 2 pilot tones, up to 8 52 tone resource units with 4 pilot tones, 4 Including up to 4 106 tone resource units with one pilot tone and up to 2 242 tone resource units with 8 pilots,
The computer-readable storage medium of claim 11, wherein the trigger frame includes signaling for assigning a single resource unit to each HE STA of the plurality of HE STAs. A method performed by a wireless device configured for high efficiency (HE) processing, comprising:
Receiving a trigger frame within a transmission opportunity (TXOP), wherein the trigger frame is an allocation of resource units for uplink data transmission in the TXOP by a plurality of HE stations (STAs) including the wireless device; Receiving, wherein the assignment comprises a single resource unit assignment of the wireless device;
The resource unit allocated by the trigger frame is a 26 tone resource unit having 2 pilot tones, a 52 tone resource unit having 4 pilot tones, a 106 tone resource unit having 4 pilot tones, or 242 having 8 pilot tones. Including any combination of tone resource units,
The resource unit is configured in an orthogonal frequency division multiple access (OFDMA) block;
Responsive to the trigger frame, generating uplink data units according to the single resource unit assignment for transmission in the OFDMA block during the TXOP period;
Having a method. When the resource units are allocated within a 20 MHz OFDMA block, the resource units are up to 9 26 tone resource units with 2 pilot tones, up to 4 52 tone resource units with 4 pilot tones and 4 Having up to two 106 tone resource units with one pilot tone,
When the resource units are allocated within a 40 MHz OFDMA block, the resource units are up to 18 26 tone resource units with 2 pilot tones, up to 8 52 tone resource units with 4 pilot tones, 4 Including up to 4 106 tone resource units with one pilot tone and up to 2 242 tone resource units with 8 pilots,
The method of claim 13, wherein the trigger frame includes signaling for assigning a single resource unit to each HE STA of the plurality of HE STAs. An access point device configured for high efficiency (HE) processing as a master station (STA),
Memory,
A processing circuit;
Have
The processing circuitry is configured to configure a trigger frame to allocate resource units including allocation of resource units for each of a plurality of HE stations (HE STAs) for uplink data transmission;
The allocated resource unit includes any combination of a 26 tone resource unit having 2 pilot tones, a 52 tone resource unit having 4 pilot tones, or a 106 tone resource unit having 4 pilot tones,
The allocated resource units are configured in orthogonal frequency division multiple access (OFDMA) blocks, and each STA is assigned a single resource unit,
The processing circuitry is configured to process one or more uplink data units received from at least a portion of the HE STA within the OFDMA block, wherein the uplink data units are responsive to the trigger frame; An apparatus received within a transmission opportunity (TXOP) obtained by the master station.   When the allocated resource unit is in a 20 MHz OFDMA block, the resource unit is up to 9 26 tone resource units with 2 pilot tones, and up to 4 52 tone resource units with 4 pilot tones. 16. The apparatus of claim 15, comprising: and up to two 106 tone resource units having four pilot tones.   When the allocated resource unit is in a 40 MHz OFDMA block, the resource unit is up to 18 26 tone resource units with 2 pilot tones, and up to 8 52 tone resource units with 4 pilot tones. 16. The apparatus of claim 15, comprising up to 4 106 tone resource units with 4 pilot tones and up to 2 242 tone resource units with 8 pilots.   When the allocated resource unit is in an 80 MHz OFDMA block, the resource unit is up to 37 26 tone resource units with 2 pilot tones, and up to 16 52 tone resource units with 4 pilot tones. 7. Up to 8 106 tone resource units with 4 pilot tones, up to 4 242 tone resource units with 8 pilots, and up to 2 484 tone resource units with 16 pilots. 15. The device according to 15. The processing circuit is further configured to generate the trigger frame for transmission to the HE STA,
The trigger frame includes signaling for allocating a plurality of resource units in the OFDMA block;
The apparatus of claim 15, wherein one of the resource units is assigned to each of the plurality of HE STAs. The trigger frame is configured for transmission within the TXOP;
The apparatus according to claim 19, wherein the trigger frame triggers a response including transmission of the uplink data unit by the HE STA. The uplink data unit comprises an uplink multi-user data unit received from the HE STA in the TXOP;
The processing circuit further includes one of the uplink multi-user data units from at least part of the HE STAs in the TXOP according to one of MU-MIMO (Multi-User Multiple-Input Multiple-Output) or OFDMA technology. 21. The apparatus of claim 20, configured to process one or more. Transmitting the trigger frame including signaling for allocating the resource unit;
21. The apparatus of claim 20, further comprising a transceiver circuit configured to receive the uplink data unit.   23. The apparatus of claim 22, further comprising two or more antennas coupled to the transceiver circuit. A non-transitory computer readable storage medium storing instructions for execution by one or more processors of an access point device configured for high efficiency (HE) processing as a master station,
The instructions configure the apparatus to perform a process of configuring a trigger frame to assign a resource unit to each of a plurality of HE stations (HE STAs) for uplink data transmission;
The allocated resource unit includes any combination of a 26 tone resource unit having 2 pilot tones, a 52 tone resource unit having 4 pilot tones, or a 106 tone resource unit having 4 pilot tones,
The allocated resource units are configured in orthogonal frequency division multiple access (OFDMA) blocks, and each STA is assigned a single resource unit,
The instructions configure the apparatus to perform processing for processing one or more uplink data units received from at least a portion of the HE STAs in the OFDMA block, the uplink data units comprising: A computer readable storage medium received in a transmission opportunity (TXOP) obtained by the master station in response to the trigger frame. The instructions further configure the apparatus to generate the trigger frame for transmission to the HE STA,
25. The computer readable storage medium of claim 24, wherein the trigger frame includes signaling for assigning one of the resource units to each of the plurality of HE STAs. An access point device configured for high efficiency (HE) processing as a master station,
Memory,
A processing circuit;
Have
The processing circuit is configured to allocate a resource unit to each of a plurality of HE stations (HE STAs) for downlink data reception;
The allocated resource unit includes any combination of a 26 tone resource unit having 2 pilot tones, a 52 tone resource unit having 4 pilot tones, or a 106 tone resource unit having 4 pilot tones,
The assigned resource unit is in an Orthogonal Frequency Division Multiple Access (OFDMA) block, and each HE STA is assigned one of the resource units;
The processing circuit generates one or more downlink data units for transmission to at least a portion of the HE STA within the OFDMA block, wherein the downlink data units are generated according to the resource allocation. The downlink data unit comprises a downlink multi-user data unit;
27. The apparatus of claim 26, wherein the multi-user data unit is configured for transmission according to one of MU-MIMO (Multi-User Multiple-Input Multiple-Output) or OFDMA techniques to at least a portion of the HE STA. . The processing circuit is further configured to generate a trigger frame for transmission to the HE STA, the trigger frame including an allocation of resource units for the HE STA for downlink data reception;
When the resource units are allocated for a 20 MHz OFDMA block, the resource units are up to 9 26 tone resource units with 2 pilot tones, up to 4 52 tone resource units with 4 pilot tones and 4 27. The apparatus of claim 26, comprising up to two 106 tone resource units having pilot tones.

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