System and method for transmitting an orthogonal frequency division multiplexing (OFDM) frame format

Abstract

An orthogonal frequency division multiple access (OFDMA) frame transmitted on a 20 megahertz (MHz) channel may include eight 26-subcarrier resource units (RUs), a 26-subcarrier bifurcated RU, and a direct current (DC) region. The eight 26-subcarrier RUs may include twenty-six consecutive data and pilot subcarriers, and the bifurcated 26-subcarrier RU may be divided into two 13-subcarrier parts, each part including thirteen consecutive data and pilot subcarriers. The DC region may include seven null subcarriers. In an example, the DC region of the 20MHz MU-OFDMA frame consists of three DC subcarriers and four null data subcarriers.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. Provisional Patent Application No. 62 / 107,936, filed on January 26, 2015, and entitled "SYSTEM AND METHOD FOR ALIGNING OFDMA RESOURCE UNITS IN TGax," which is hereby incorporated by reference into this application. Technical Field

[0003] The present invention relates to systems and methods for wireless communications, and in particular, to systems and methods for communicating orthogonal frequency division multiplexing (OFDM) frame formats. Background Art

[0004] The next generation of wireless local area networks (WLANs) will be deployed in high-density environments, where access points (APs) provide wireless access to a large number of stations (STAs) in the same geographic area. An ideal next generation WLAN will be able to simultaneously support a variety of service types with diverse quality of service (QoS) requirements, as mobile devices are increasingly used to access streaming video, mobile gaming, and other services. Summary of the invention

[0005]

[0013] A technical advance is generally achieved by embodiments of the present disclosure that describe a system and method for transmitting an Orthogonal Frequency Division Multiplexing (OFDM) frame format.

[0006] According to one embodiment, a method for transmitting data is provided. In this example, the method includes transmitting an orthogonal frequency division multiple access (OFDMA) frame. The OFDMA frame includes a first set of data and pilot subcarriers (tones), a second set of data and pilot subcarriers, and a direct current (DC) region between the first set of data and pilot subcarriers and the second set of data and pilot subcarriers. The DC region consists of seven null subcarriers that exclude data and pilot signaling. An apparatus for performing the method is also provided.

[0007] According to another embodiment, another method for transmitting data is provided. In this example, the method includes receiving an orthogonal frequency division multiple access (OFDMA) frame. The OFDMA frame includes a first set of data and pilot subcarriers, a second set of data and pilot subcarriers, and a direct current (DC) region between the first set of data and pilot subcarriers and the second set of data and pilot subcarriers. The DC region consists of seven empty subcarriers excluding data and pilot signaling. The method also includes decoding at least a portion of the OFDMA frame. A device for performing this method is also provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more fully understand the present invention and its advantages, the following description will be made in conjunction with the accompanying drawings, in which:

[0009] Figure 1 is a schematic diagram of a WiFi network used to transmit data;

[0010] Figure 2 is a frame structure embodiment of an Orthogonal Frequency Division Multiplexing (OFDM) frame;

[0011] Figure 3A is a schematic diagram of an embodiment of subcarrier planning of a multi-user orthogonal frequency division multiple access (OFDMA) (multi-user OFDMA, MU-OFDMA) frame transmitted on a 20 megahertz (MHz) channel;

[0012] Figure 3B is a schematic diagram of an embodiment of subcarrier planning of a single-user OFDMA (SU-OFDMA) frame transmitted on a 20 MHz channel;

[0013] Figure 4A is a schematic diagram of an embodiment of subcarrier planning of a MU-OFDMA frame transmitted on a 40 MHz channel;

[0014] Figure 4B is a schematic diagram of an embodiment of subcarrier planning of a SU-OFDMA frame transmitted on a 40 MHz channel;

[0015] Figure 5A is a schematic diagram of an embodiment of subcarrier planning of a MU-OFDMA frame transmitted on an 80 MHz channel;

[0016] Figure 5B is a schematic diagram of an embodiment of subcarrier planning of a SU-OFDMA frame transmitted on an 80 MHz channel;

[0017] Fig. 6A is a schematic diagram of another subcarrier planning embodiment of a MU-OFDMA frame transmitted on an 80 MHz channel;

[0018] Figure 6B is a schematic diagram of another subcarrier planning embodiment of a SU-OFDMA frame transmitted on an 80 MHz channel;

[0019] Figure 7 An embodiment of subcarrier planning of a 20MHz OFDMA frame is shown;

[0020] Figure 8 An embodiment of subcarrier planning of a 40MHz OFDMA frame is shown;

[0021] Fig. 9 An embodiment of subcarrier planning for 80MHz OFDMA and SU frames is shown;

[0022] Fig.10 An additional subcarrier planning embodiment for 80MHz OFDMA and SU frames is shown;

[0023] Fig.11 is a block diagram of an embodiment of a processing system; and

[0024] Fig.12 is a block diagram of an embodiment of a transceiver.

[0025] Corresponding numerals and symbols generally refer to corresponding parts in the different drawings unless otherwise indicated.The drawings clearly illustrate the relevant aspects of the embodiments and are not necessarily drawn to scale. DETAILED DESCRIPTION

[0026] First, it should be understood that although the following provides an exemplary implementation of one or more embodiments, the disclosed systems and / or methods can be implemented by any number of technologies, whether or not the technology is known. The present disclosure is in no way limited to the exemplary implementations, drawings, and techniques shown below, including the designs and implementations shown and described herein, but can be modified within the scope of the attached claims and their equivalents.

[0027] The Institute of Electrical and Electronics Engineers (IEEE) 802.11ac defines a WLAN protocol for transmitting data at 2.5 GigaHertz (GHz) and 5 GHz carrier frequencies, and can support an aggregate throughput of up to 6.77 Gigabits per second (Gits / s). To meet the performance goals of next-generation WLANs, higher throughput may be required. Therefore, IEEE 802.11ax is being developed as an extension of IEEE 802.11ac, with the goal of providing a maximum rate of 10 GBits at 2.4 GHz and 5 GHz carrier frequencies.

[0028] This document provides a subcarrier planning embodiment for transmitting orthogonal frequency division multiple access (OFDMA) frames on 20 megahertz (MHz), 40MHz and 80MHz channels. IEEE 802.11ax may adopt one or more of the subcarrier planning embodiments. In one embodiment, a multi-user OFDMA (MU-OFDMA) frame is transmitted on a 20MHz channel. The MU-OFDMA frame may carry multiple data streams in different resource units (RUs) and send them to one or more receiving devices. The 20MHz MU-OFDMA frame may include eight 26-subcarrier resource units (RUs), a 26-subcarrier bifurcated RU and a direct current (DC) region. The eight 26-subcarrier RUs include twenty-six consecutive data and pilot subcarriers, and the bifurcated 26-subcarrier RU is divided into two 13-subcarrier parts, each part including thirteen consecutive data and pilot subcarriers. The DC region may include seven empty subcarriers. In one example, the DC region of a 20MHz MU-OFDMA frame consists of three DC subcarriers and four empty data subcarriers. The so-called empty subcarriers are subcarriers from which data, pilots, and control signaling are excluded, such as DC subcarriers, guard subcarriers, and / or empty data subcarriers (such as data subcarriers that are re-purposed as empty subcarriers). Empty subcarriers can be located between adjacent RUs in an OFDMA frame, thereby reducing inter-symbol interference between data streams respectively carried by adjacent RUs. Empty subcarriers can also be located between adjacent carriers (such as in edge areas) to reduce inter-carrier interference and protect RUs near edge areas from distortion due to transmission filtering and other effects. The eight 26-subcarrier RUs and the 13-subcarrier portions of the bifurcated RUs are distributed over two data and pilot areas, and the DC area is located between these data and pilot areas. Specifically, four of the 26-subcarrier RUs and one 13-subcarrier portion of the bifurcated RU may be located within one data and pilot region, and the remaining four 26-subcarrier RUs and another 13-subcarrier portion of the bifurcated RU may be located within another data and pilot region. Each data and pilot region may be located between the DC region and a corresponding edge region. One edge region may include a pair of null data subcarriers and six guard subcarriers. Another edge region may include a pair of null data subcarriers and five guard subcarriers.

[0029] In another embodiment, a MU-OFDMA frame is transmitted on an 80MHz channel. The 80MHz MU-OFDMA frame includes thirty-six 26-subcarrier RUs, one 26-subcarrier bifurcated RU, and a DC region consisting of seven DC subcarriers. The RUs may be distributed over the two innermost data and pilot regions and the two outermost data and pilot regions. In one example, nine of the 26-subcarrier RUs and a 13-subcarrier portion of the bifurcated RU are located within each innermost data and pilot region, and nine of the 26-subcarrier RUs are located within each outermost data and pilot region. The DC region may be located between the innermost data and pilot regions, and each outermost data and pilot region may be located between a corresponding innermost data and pilot region and its corresponding edge region. An edge region may include a group of eight empty data subcarriers and twelve guard subcarriers. Another edge region may include a group of eight empty data subcarriers and eleven guard subcarriers. In some embodiments, a group of eight null data subcarriers are located between each innermost data and pilot region and its corresponding outermost data and pilot region. In such embodiments, an 80 MHz MU-OFDMA frame may carry three to six null data subcarriers.

[0030] In another embodiment, a single-user OFDMA (SU-OFDMA) frame is transmitted on an 80MHz channel. The SU-OFDMA frame can carry a single data stream to a receiving device. In one example, an 80MHz SU-OFDMA frame includes 994 data and pilot subcarriers, a 26-subcarrier bifurcated RU, and seven DC subcarriers. The 994 data and pilot subcarriers are distributed over the two innermost data and pilot regions and the two outermost data and pilot regions. The two innermost data and pilot regions each carry 242 consecutive data and pilot subcarriers and a 13-subcarrier portion of the bifurcated RU. The two outermost data and pilot regions each carry 242 consecutive data and pilot subcarriers. Similar to the 80MHz MU-OFDMA frame, the DC region of the 80MHz SU-OFDMA frame can be located between the innermost data and pilot regions. Each outermost data and pilot region in an 80MHz SU-OFDMA frame may be located between a corresponding innermost data and pilot region and its corresponding edge region. One edge region may contain twelve guard subcarriers, and another edge region contains eleven guard subcarriers. These and other aspects are described in more detail below.

[0031] Figure 1A network 100 for transmitting data is shown. The network 100 includes an access point (AP) 110 having a coverage area 10, a plurality of mobile stations 120, and a backhaul network 108. As shown, the AP 110 establishes an uplink (dashed line) and / or downlink (dotted line) connection with the mobile station 120, both of which function to carry data from the mobile station 120 to the AP 110 or vice versa. The data carried via the uplink / downlink connection may include data transmitted between the mobile stations 120, as well as data transmitted to or from a remote end (not shown) via the backhaul network 108. As used herein, the term "access point (AP)" refers to any component (or collection of components) configured to provide wireless access to a network, such as an enhanced base station (eNB), a macro cell, a femto cell, a Wi-Fi access point (AP), or other wirelessly enabled device. The AP may provide wireless access based on one or more wireless communication protocols, such as Wi-Fi 802.11a / b / g / n / ac / ax, long term evolution (LTE), LTE advanced (LTE-A), high speed packet access (HSPA), etc. In this document, the term "mobile station" refers to any component (or collection of components) that can establish a wireless connection with an AP, such as a station (STA), user equipment (UE), and other wireless-enabled devices. In some embodiments, the network 100 may include various other devices, such as relays, low-power nodes, etc.

[0032] Figure 22 is a schematic diagram of an embodiment of a frame structure for a downlink (DL) OFDM frame 200. As shown, the downlink OFDM frame 200 includes a legacy short training field (L-STF) / long training field (LTF) 201, a legacy signaling field (L-SIG) / repeated legacy (RL) SIG field 202, a high efficiency (HE) first signal (SIGA) field 204, a HE second signal (SIGB) field 206, a HE-STF / LTF field 208 and a data payload field 210. Scheduling index information is embedded in the SIGB field 206. The index information associates an identifier (ID) assigned to an individual STA or a group of STAs to the start or end position of a RU subset assigned in a RU sequence carried by the OFDM frame. For example, the scheduling index information may indicate the first RU and / or the last RU in the RU subset allocated to a STA, and may allow the STA to locate the allocated RU subset when receiving the frame.

[0033] Figure 3A 3 is a schematic diagram of a subcarrier planning embodiment of a MU-OFDMA frame 301 transmitted on a 20 MHz channel. As shown, the MU-OFDMA frame 301 includes eight 26-subcarrier RUs 310, two parts 311 and 312 of the bifurcated 26-subcarrier RU, null data subcarriers 320, and DC subcarriers 330. In this example, three DC subcarriers 330 and four null data subcarriers 320 are included in a DC region 350. Four 26-subcarrier RUs 310 and a part 311 of the bifurcated RU are included in a data and pilot region 381, and four 26-subcarrier RUs 310 and the remaining part 312 of the bifurcated RU are included in a data and pilot region 382. The DC region 350 is located between the data and pilot region 381 and the data and pilot region 382. Two null data subcarriers 320 are included in an edge region 391, and two null data subcarriers 320 are located in an edge region 392. Additionally, six guard subcarriers 340 are included in edge region 391 and five guard subcarriers 340 are included in edge region 392. In some embodiments, guard subcarriers 340 are included in the 20 MHz channel in which MU-OFDMA frame 301 is transmitted. In other embodiments, guard subcarriers 340 are located outside of the 20 MHz channel in which MU-OFDMA frame 301 is transmitted.

[0034] Figure 3B3 is a schematic diagram of an embodiment of a subcarrier planning of a SU-OFDMA frame 302 transmitted on a 20 MHz channel. As shown, the SU-OFDMA frame 302 includes data and pilot regions 315, 316, and a DC subcarrier 330. In this example, the data and pilot regions 315, 316 each include one hundred and twenty-one consecutive data and pilot subcarriers. The DC subcarrier 330 is located between the data and pilot regions 315 and 316. The data and pilot region 315 is located between six guard subcarriers 340 and the DC subcarrier 330. The data and pilot region 316 is located between the DC subcarrier 330 and five guard subcarriers 340. In some embodiments, the guard subcarrier 340 is included in the 20 MHz channel in which the SU-OFDMA frame 302 is transmitted. In other embodiments, the guard subcarrier 340 is located outside the 20 MHz channel in which the SU-OFDMA frame 302 is transmitted.

[0035] Embodiments of the present disclosure provide subcarrier planning for OFDMA frames transmitted on a 40 MHz channel. Figure 4A 40 MHz channel. As shown, the MU-OFDMA frame 401 includes eighteen 26-subcarrier RUs 410, null data subcarriers 420, and DC subcarriers 430. Five DC subcarriers 430 and eight null data subcarriers 420 are included in the DC region 450. Nine 26-subcarrier RUs 410 are included in the data and pilot region 481, and nine 26-subcarrier RUs 410 are included in the data and pilot region 482. The DC region 450 is located between the data and pilot region 481 and the data and pilot region 482. Four null data subcarriers 420 are included in the edge region 491, and four null data subcarriers 420 are included in the edge region 492. Additionally, twelve guard subcarriers 440 are included in the edge region 491, and eleven guard subcarriers 440 are included in the edge region 492. In some embodiments, guard subcarriers 440 are included in the 40 MHz channel in which MU-OFDMA frame 401 is transmitted. In other embodiments, guard subcarriers 440 are located outside of the 40 MHz channel in which MU-OFDMA frame 401 is transmitted.

[0036] Figure 4B4 is a schematic diagram of an embodiment of a subcarrier planning of a SU-OFDMA frame 402 transmitted on a 40 MHz channel. As shown, the SU-OFDMA frame 402 includes data and pilot regions 415, 416, and a DC subcarrier 430. In this example, the data and pilot regions 415 and 416 each include two hundred and forty-two consecutive data and pilot subcarriers. The DC subcarrier 430 is located between the data and pilot regions 415 and 416. The data and pilot region 415 is located between twelve guard subcarriers 440 and the DC subcarrier 430. The data and pilot region 416 is located between the DC subcarrier 430 and eleven guard subcarriers 440. In some embodiments, the guard subcarrier 440 is included in the 40 MHz channel in which the SU-OFDMA frame 402 is transmitted. In other embodiments, the guard subcarrier 440 is located outside the 40 MHz channel in which the SU-OFDMA frame 402 is transmitted.

[0037] Embodiments of the present disclosure provide subcarrier planning for OFDMA frames transmitted on an 80 MHz channel. Figure 5Ais a schematic diagram of a subcarrier planning embodiment of a MU-OFDMA frame 501 transmitted on an 80 MHz channel. As shown, the MU-OFDMA frame 501 includes a 26-subcarrier RU 510, parts 511 and 512 of the bifurcated 26-subcarrier RU, a null data subcarrier 520, and five DC subcarriers 530. In this example, the 26-subcarrier RU 510 and the parts 511 and 512 of the bifurcated 26-subcarrier RU are distributed over four data and pilot regions 581, 582, 583, and 584. Specifically, the data and pilot region 581 includes nine 26-subcarrier RUs 510 and one part 511 of the bifurcated RU, and the data and pilot region 582 includes nine 26-subcarrier RUs 510 and the remaining part 512 of the bifurcated RU. The data and pilot regions 583 and 584 each include nine 26-subcarrier RUs 510. The DC region 550 is located between the data and pilot region 581 and the data and pilot region 582. The data and pilot region 581 is located between the DC region and the data and pilot region 584, and the data and pilot region 582 is located between the DC region and the data and pilot region 583. The data and pilot region 584 is located between the data and pilot region 581 and the edge region 591, and the data and pilot region 583 is located between the data and pilot region 582 and the edge region 592. Due to the relative position relationship between each other, the data and pilot regions 581 and 582 may be referred to as the innermost data and pilot regions in the MU-OFDMA frame 501 herein, and the data and pilot regions 583 and 584 may be referred to as the outermost data and pilot regions in the MU-OFDMA frame 501 herein. Eight null data subcarriers 520 are included in the edge region 591, and eight null data subcarriers 520 are included in the edge region 592. Additionally, thirteen guard subcarriers 540 are included in edge region 591 and twelve guard subcarriers 540 are included in edge region 592. In some embodiments, guard subcarriers 540 are included in the 80 MHz channel in which MU-OFDMA frame 501 is transmitted. In other embodiments, guard subcarriers 540 are located outside the 80 MHz channel in which MU-OFDMA frame 501 is transmitted. Eight null data subcarriers 520 are located between data and pilot regions 581 and 584. Similarly, eight null data subcarriers 520 are located between data and pilot regions 582 and 583.

[0038] Figure 5Bis a schematic diagram of an embodiment of a subcarrier plan of a SU-OFDMA frame 502 transmitted on an 80 MHz channel. As shown, the SU-OFDMA frame 502 includes data and pilot regions 515, 516, 517, and 518, portions 511, 512 of a bifurcated 26-subcarrier RU, and five DC subcarriers 530. In this example, the data and pilot regions 515, 516, 517, and 518 each include two hundred and forty-two consecutive data and pilot subcarriers. The five DC subcarriers 530 are located between the data and pilot regions 515 and 516. The data and pilot regions 515 and 518 are located between twelve guard subcarriers 540 and the DC subcarriers 530. The data and pilot regions 516 and 517 are located between the DC subcarriers 530 and eleven guard subcarriers 540. In some embodiments, the guard subcarriers 540 are included in the 80 MHz channel over which the SU-OFDMA frame 502 is transmitted. In other embodiments, the guard subcarrier 540 subcarrier is located outside the 80 MHz channel in which the SU-OFDMA frame 502 is transmitted.

[0039] Fig. 6A 601 is a schematic diagram of an embodiment of a subcarrier planning of a MU-OFDMA frame 601 transmitted on an 80 MHz channel. The RUs 610, 611, 612, subcarriers 620, 630, 640, and regions 650, 681, 682, 683, 684, 691, 692 in the MU-OFDMA frame 601 have similar arrangements and configurations as the similar components / regions in the MU-OFDMA frame 501, except that the DC region 650 includes seven DC subcarriers 630, the edge region 691 includes twelve guard subcarriers 640, and the edge region 692 includes eleven guard subcarriers 640.

[0040] Figure 6B 6 is a schematic diagram of an embodiment of a subcarrier planning of a SU-OFDMA frame 602 transmitted on an 80 MHz channel. The data and pilot regions in the SU-OFDMA frame 602 have a similar arrangement and configuration as the similar components / regions in the SU-OFDMA frame 502, except that the DC region 650 includes seven DC subcarriers 630, and there are twelve guard subcarriers 640 outside the data and pilot region 618, and there are eleven guard subcarriers 640 outside the data and pilot region 617.

[0041] Aspects of the present disclosure provide frame format embodiments for use in wireless environments, such as Institute of Electrical and Electronics Engineers (IEEE) 802.11ax networks. Embodiments provide subcarrier planning for orthogonal frequency division multiple access (OFDMA) resource units (RUs) for 20MHz, 40MHz, and 80MHz OFDMA transmissions. An embodiment on 20MHz includes 6 empty subcarriers on one edge of an orthogonal frequency division multiplexing (OFDM) frame, 5 empty subcarriers on the other edge of the OFDM frame, and 3 empty subcarriers in the direct current (DC) region. An OFDM frame embodiment for 40MHz has 242x 2=484 data and pilot subcarriers, which are grouped according to RUs, with additional empty subcarriers in the DC region and on the edges. Single-user (SU) frames are scheduled for a single user. Multi-user OFDMA frames can be scheduled for multiple users. In other embodiments, for 80MHz OFDM transmissions, there are either 5 empty subcarriers or 7 empty subcarriers in the DC region. In another embodiment, 20MHz, 40MHz and 80MHz OFDMA subcarrier planning uses 26-subcarrier RU, and 20MHz SU scheduling uses 242-subcarrier RU. The OFDMA or SU frame may be a downlink frame or an uplink frame.

[0042] In one OFDM frame embodiment, there are 8 leftover subcarriers in each 242-subcarrier block. The residual subcarriers can be used as separators between different RUs, especially RUs of smaller size, to reduce leakage from adjacent blocks. Additional empty subcarriers near the edge can be used to provide protection for pulse shaping filters and adjacent shields. There is no data transmission on the residual subcarriers, DC subcarriers or edge subcarriers. In other words, the residual subcarriers, DC subcarriers and edge subcarriers are all empty subcarriers. The residual subcarrier can be adjacent to the edge subcarrier, in which case the number of empty subcarriers near the edge is equal to the sum of the number of edge subcarriers and the number of residual subcarriers adjacent to the edge subcarrier. Similarly, the residual subcarrier can be adjacent to the DC subcarrier, in which case the number of empty subcarriers in the DC region is equal to the sum of the number of DC subcarriers and the number of residual subcarriers adjacent to the DC region. The edge subcarrier is also called a guard subcarrier.

[0043] There are several factors to consider in determining subcarrier planning and RU allocation. RUs can be aligned between 20MHz, 40MHz, and 80MHz frame configurations. The allocation of empty subcarriers in the DC region and empty subcarriers at the edge can be based on spectrum mask and carrier frequency offset (CFO) requirements to protect subcarriers adjacent to edge subcarriers and DC subcarriers in the RU. Other considerations in determining subcarrier planning and RU allocation include the utilization of residual subcarriers, for example, to align RUs, and to protect subcarriers adjacent to DC subcarriers and edge subcarriers in the RU. Edge subcarriers, DC subcarriers, and residual subcarriers are all empty subcarriers and are not used to transmit data or pilots.

[0044] Distortion may affect subcarriers in RUs adjacent to the edge of an OFDMA frame to a greater extent than subcarriers in RUs adjacent to the edge of a SU frame. In one example, the subcarrier planning for SU frames and OFDMA frames is similar. Alternatively, the subcarrier planning for SU frames and OFDMA frames is different. In one example, additional empty subcarriers are used in OFDMA frames to provide additional protection for RUs near the edge and in the DC region. Therefore, OFDMA frames may have more empty subcarriers near the edge and in the DC region compared to SU frames. Empty subcarriers near the edge are located at the edge of the transmission band and serve as guard subcarriers to reduce the impact of transmission filtering on data and pilot subcarriers. Empty subcarriers in the DC region are subcarriers with empty content (i.e., subcarriers that do not carry data or information) that are used by mobile devices to locate the center of the OFDM band.

[0045] Embodiments provide subcarrier planning for 40MHz and 80MHz OFDM frames. In some embodiments, 5 DC subcarriers are used, for example with a CFO of 40ppm. In other embodiments, for example at 80MHz, 7 DC subcarriers or 5 DC subcarriers may be used. In various embodiments, null subcarriers are used to align RUs, and subcarriers adjacent to the DC region and edges are protected.

[0046] In an embodiment of a 40MHz subcarrier planning, there are two 242-subcarrier RUs containing data and pilot subcarriers, and 28 subcarriers allocated to empty subcarriers in the DC region and empty subcarriers near the edge. In one example, there are 5 empty subcarriers in the DC region and [12,11] empty subcarriers near the edge. Here, the expression [A,B] means that there are A edge subcarriers at one edge of the OFDM frame and B edge subcarriers at the other edge of the OFDM frame. In an embodiment of an 80MHz subcarrier planning, there are [13,12] empty subcarriers near the edge and 5 empty subcarriers in the DC region. In another embodiment of an 80MHz subcarrier planning, there are [12,11] empty subcarriers near the edge and 7 empty subcarriers in the DC region. There may be 994 subcarriers for data, pilot, and residual subcarriers. In one embodiment, the subcarrier planning of the SU frame is the same as that of the OFDMA frame. Alternatively, the subcarrier planning of the SU frame is different from the subcarrier planning of the OFDMA frame.

[0047] Before transmitting a frame, transmission filtering may be performed. The transmission filter may be based on a spectrum mask. Residual subcarriers may be used to protect RUs adjacent to null subcarriers at the edge and null subcarriers in the DC region.

[0048] In OFDMA, different RUs are assigned to different STAs. Any number of RUs can be assigned to each specific STA. Each STA estimates the channel and restores the entire message. The signaling field is used by each STA to determine which RU(s) are assigned to the specific STA.

[0049] Figure 7A subcarrier plan 740 for a 20MHz OFDMA frame is shown. There are a total of 242 data, pilot and residual subcarriers. The residual subcarriers are used to protect RUs adjacent to the DC subcarriers and edge subcarriers, increasing the number of empty subcarriers in the DC region and the number of empty subcarriers near the edge. The residual subcarriers used to protect the RUs near the DC subcarrier increase the number of empty subcarriers in the DC region. Similarly, the residual subcarriers used to protect the RUs near the edge subcarriers increase the number of empty subcarriers near the edge. The DC subcarrier, the edge subcarrier and the residual subcarrier are all empty subcarriers. The subcarriers in RU744 include data and pilot subcarriers, and subcarriers 746, 747 and 742 are residual subcarriers and also empty subcarriers. The pilot subcarriers may be distributed on subcarriers throughout all RUs 744. The separated pilot subcarriers carried by the RU may be used to adjust or estimate the phase offset and / or frequency offset of the data subcarriers carried in the RU. For example, in an uplink OFDMA frame carrying RUs transmitted by different STAs, the pilot subcarriers carried by each RU can be used by the serving AP to perform residual carrier frequency offset estimation on the uplink OFDMA frame. There are 234 data and pilot subcarriers, including 8 26-subcarrier RUs 744 and 26-subcarrier RUs 745, the latter of which are divided into 13 subcarriers on each side of the empty subcarrier in the DC region 743. There are 8 residual subcarriers, which are used to protect the edge subcarriers and RUs near the DC subcarrier. Two residual subcarriers 742 are used on each side of the DC subcarrier 748. Two residual subcarriers 746 are placed adjacent to 6 edge subcarriers 749, so there are 8 empty subcarriers near the edge 747. There are also two residual subcarriers 746 adjacent to 5 edge subcarriers 749, so there are 7 empty subcarriers near the edge 747.

[0050] Figure 8 A subcarrier plan 750 for a 40 MHz transmission of an OFDMA frame and a SU frame is shown. There are 484 subcarriers for data, pilot, and residual subcarriers, and 28 subcarriers for DC and edge subcarriers. The subcarrier plan 750 includes an OFDMA subcarrier plan 770 and a SU subcarrier plan 772. The subcarriers in the OFDMA subcarrier plan 770 are sent to or received from multiple STAs. The subcarriers in the SU subcarrier plan 772 are sent to or received from a single STA.

[0051] SU subcarrier planning 772 includes 5 DC subcarriers 762. The 5 DC subcarriers 762 are included in the DC region. Both sides of the DC subcarrier 762 are 242-subcarrier RUs 764. Each 242-subcarrier RU includes 4 pilot subcarriers and 238 data subcarriers. One edge includes 12 edge subcarriers 766. The other edge includes 11 edge subcarriers 768.

[0052] The RUs and residual subcarriers of the OFDMA subcarrier plan 770 are aligned with the RUs of the SU subcarrier plan 772. The OFDMA subcarrier plan 770 includes five DC subcarriers 752. There are four residual subcarriers 754 on each side of the DC subcarrier 752, so there are 13 empty subcarriers in the DC region, which are used to protect the RUs near the empty subcarriers in the DC region. There are 12 edge subcarriers 760 at one edge. Four residual subcarriers 756 are adjacent to the edge subcarriers 760, so there are 16 empty subcarriers near the edge 761. At the other edge are 11 edge subcarriers 762, and four residual subcarriers 757 are adjacent to the edge subcarrier 762, so there are 15 empty subcarriers near the edge 763. These 468 data and pilot subcarriers are distributed on 18 26-subcarrier RUs. Nine 26-subcarrier RUs are located on both sides of the DC region. Each 26-subcarrier RU contains 2 pilot subcarriers and 24 data subcarriers.

[0053] Fig. 9 An 80MHz subcarrier plan 950 for OFDMA and SU frames is shown. There are 994 data, pilot, and residual subcarriers, and 30 DC and edge subcarriers. Subcarrier plan 950 contains OFDMA subcarrier plan 979 and SU subcarrier plan 978. Subcarriers in OFDMA subcarrier plan 979 are sent to or received from multiple STAs. Subcarriers in SU subcarrier plan 978 are sent to or received from a single STA. The RUs of OFDMA subcarrier plan 979 are aligned with the RUs of SU subcarrier plan 978.

[0054] SU subcarrier plan 978 includes five DC subcarriers 966. RU 968 is divided into two 13-subcarrier sections. Five DC subcarriers 966 are located between the two 13-subcarrier sections of RU 968. The subcarriers in RU 970 include two groups of 242 subcarrier RUs on both sides, so there are four 242 subcarrier RUs. There are 13 edge subcarriers 974 on one edge and 12 edge subcarriers 975 on the opposite edge.

[0055] The RU, DC subcarrier, and edge subcarriers of the OFDMA subcarrier plan 979 are aligned with the RU, DC subcarrier, and edge subcarriers of the SU subcarrier plan 978, respectively. In the OFDMA subcarrier plan 979, there are 962 pilot and data subcarriers, divided into 37 26-subcarrier RUs. The OFDMA subcarrier plan 979 includes 5 DC subcarriers 952, which are aligned with the DC subcarrier 966. In the DC region, there are a total of 5 empty subcarriers. Similarly, the OFDMA subcarrier plan 979 includes 13 edge subcarriers 964. There are 8 residual subcarriers 962 adjacent to the edge subcarrier 964, so there are a total of 21 empty subcarriers at the edge 963. Similarly, the OFDMA subcarrier plan 979 includes 12 edge subcarriers 965. The residual subcarrier 963 is adjacent to the edge subcarrier 965, so there are a total of 20 empty subcarriers near the edge 967. 26-subcarrier RU 954 is split by DC subcarrier 952, with 13 subcarriers on either side of DC subcarrier 952. There are four groups of 26-subcarrier RUs 960, 956, 957, and 961, with nine 26-subcarrier RUs in each group. The residual subcarriers include subcarriers 962, 958, 959, and 963. Subcarriers 958 and 959 are located between each group of nine 26-subcarrier RUs.

[0056] Fig.10 An 80MHz subcarrier plan 1080 for an OFDMA frame and a SU frame is shown. There are 994 data, pilot, and residual subcarriers, and 30 DC and edge subcarriers. The subcarrier plan 1080 includes an OFDMA subcarrier plan 1006 and a SU subcarrier plan 1008. The subcarriers in the OFDMA subcarrier plan 1006 are sent to or received from multiple STAs. The subcarriers in the SU subcarrier plan 1008 are sent to or received from a single STA. The RU, DC subcarrier, and edge subcarriers of the OFDMA subcarrier plan 1006 are aligned with the RU, DC subcarrier, and edge subcarriers of the SU subcarrier plan 1008, respectively.

[0057] SU subcarrier plan 1008 includes 7 DC subcarriers 1096. In the DC region, there are 7 empty subcarriers. Similarly, RU 1098 includes two 13-subcarrier sections. DC subcarrier 1096 is located between the two 13-subcarrier sections of RU 1098. RU 1000 includes two groups of 242-subcarrier RUs located on both sides of DC subcarrier 1096 and RU 1098. There are 12 edge subcarriers 1002 at one edge, so there are 12 empty subcarriers at the edge, and there are 11 edge subcarriers 1004 at the opposite edge, so there are 11 empty subcarriers at the edge.

[0058] The OFDMA subcarrier plan 1006 is aligned with the SU subcarrier plan 1008. In the OFDMA subcarrier plan 1006, there are 37 26-subcarrier RUs. The OFDMA subcarrier plan 1006 includes 7 DC subcarriers 1082, so there are 7 empty subcarriers in the DC region. Similarly, the OFDMA subcarrier plan 1006 includes 12 edge subcarriers 1094 and 11 edge subcarriers 1095. The residual subcarriers include four groups of subcarriers 1092, 1088, 1089 and 1093, each with eight subcarriers. The 8 subcarriers 1092 are adjacent to the edge subcarrier 1094, so there are 20 empty subcarriers at the edge 1093. Similarly, the 8 residual subcarriers 1093 are adjacent to the edge subcarrier 1095, so there are 19 empty subcarriers at the edge 1097. Subcarriers 1088 and subcarriers 1089 are located between each group of 9 26-subcarrier RUs. The 26 subcarriers 1084 include 13 subcarriers on either side of the DC subcarrier 1082. There are four groups of 26-subcarrier RUs 1090, 1086, 1087, and 1091, each with 9 26-subcarrier RUs.

[0059] In another embodiment, there are 37 26-subcarrier RUs in total, and one of the 26-subcarrier RUs can be used to schedule a STA.

[0060] Additional examples may include RUs of different sizes. For example, a RU may accommodate 26 subcarriers, 52 subcarriers, 106 subcarriers, 242 subcarriers, or another number of subcarriers.

[0061] For downlink frames, based on the signaling field of the frame, the receiver determines which RU is scheduled for the STA. The receiver may use the pilot to perform CFO estimation. Residual frequency offset compensation may include: estimating the residual carrier frequency offset based on the dedicated pilot carried in the OFDMA transmission.

[0062] Embodiments include subcarrier planning for 40MHz and 80MHz OFDMA transmissions. In one embodiment, the OFDMA subcarrier planning is the same or similar to the SU subcarrier planning. Alternatively, the OFDMA subcarrier planning is different from the SU subcarrier planning. In one embodiment, for a CFO of 40ppm, there are 5 DC subcarriers. In one embodiment, the 26-subcarrier RU of the OFDMA frame is aligned with the 242-subcarrier RU of the SU frame, and one RU does not overlap the position of another RU. In one embodiment, the residual subcarriers are used to align the RUs and protect the subcarriers near the DC subcarrier and the edge subcarriers. In one embodiment, a 26-subcarrier RU is used for scheduling in 80MHz.

[0063] Fig.111 is a block diagram of an embodiment of a processing system 1100 for executing the methods described herein, which may be installed on a host device. As shown in the figure, the processing system 1100 includes a processor 1104, a memory 1106, and interfaces 1110-1114, which may or may not be in accordance with Fig.11 Arranged as shown. Processor 1104 can be any component or collection of components suitable for performing calculations and / or other processing-related tasks, and memory 1106 can be any component or collection of components suitable for storing programs and / or instructions for execution by processor 1104. In one embodiment, memory 1106 includes non-transitory computer-readable media. Interfaces 1110, 1112, and 1114 can be any component or collection of components that allow processing system 1100 to communicate with other devices / components and / or users. For example, one or more of interfaces 1110, 1112, 1114 can be used to transmit data, control or management messages from processor 1104 to applications installed on a host device and / or a remote device. For another example, one or more of interfaces 1110, 1112, 1114 can be used to allow a user or user device (such as a personal computer (PC)), etc.) to interact / communicate with processing system 1100. Processing system 1100 may include components not shown in Fig.11 Additional components in, such as long-term storage (such as non-volatile memory, etc.).

[0064] In some embodiments, the processing system 1100 is included in a network device that is accessing a telecommunications network or is part of a telecommunications network. In one example, the processing system 1100 is located in a network-side device in a wireless or wireline telecommunications network, such as a base station, a relay station, a scheduler, a controller, a gateway, a router, an application server, or any other device in the telecommunications network. In other embodiments, the processing system 1100 is located in a user-side device that accesses a wireless or wireline telecommunications network, such as a mobile station, a user equipment (UE), a personal computer (PC), a tablet computer, a wearable communication device (such as a smart watch, etc.), or any other device suitable for accessing a telecommunications network.

[0065] In some embodiments, one or more of interfaces 1110, 1112, 1114 connects processing system 1100 to a transceiver suitable for transmitting and receiving signaling over a telecommunications network. Fig.12A block diagram of a transceiver 1200 adapted to transmit and receive signaling through a telecommunications network is shown. The transceiver 1200 may be installed on a host device. As shown, the transceiver 1200 includes a network side interface 1202, a coupler 1204, a transmitter 1206, a receiver 1208, a signal processor 1210, and a device side interface 1212. The network side interface 1202 may include any component or set of components adapted to transmit or receive signaling through a wireless or wired telecommunications network. The coupler 1204 may include any component or set of components adapted to implement bidirectional communication through the network side interface 1202. The transmitter 1206 may include any component or set of components (such as an up-converter, a power amplifier, etc.) adapted to convert a baseband signal into a modulated carrier signal adapted to be transmitted through the network side interface 1202. The receiver 1208 may include any component or collection of components suitable for converting a carrier signal received through the network-side interface 1202 to a baseband signal (e.g., a downconverter, a low noise amplifier, etc.). The signal processor 1210 may include any component or collection of components suitable for converting a baseband signal to a digital signal suitable for communication through the device-side interface 1212 (or vice versa). The device-side interface 1212 may include any component or collection of components suitable for communicating digital signals between the signal processor 1210 and components in a host device (e.g., the processing system 1100, a local area network (LAN) port, etc.).

[0066] The transceiver 1200 may transmit and receive signaling via any type of communication medium. In some embodiments, the transceiver 1200 transmits and receives signaling via a wireless medium. For example, the transceiver 1200 may be a wireless transceiver adapted to communicate in accordance with a wireless communication protocol, such as a cellular network protocol (such as long term evolution (LTE), etc.), a wireless local area network (WLAN) protocol (such as Wi-Fi, etc.), or any other type of wireless protocol (such as Bluetooth, near field communication (NFC), etc.). In such embodiments, the network side interface 1202 includes one or more antennas / radiating elements. For example, the network side interface 1202 may include a single antenna, multiple separate antennas, or a multi-antenna array configured for multi-level communication (such as single input multiple output (SIMO), multiple input single output (MISO), multiple input multiple output (MIMO), etc.). In other embodiments, the transceiver 1200 transmits and receives signaling via a wired medium (such as a twisted pair cable, a coaxial cable, an optical fiber, etc.). A specific processing system and / or transceiver may utilize all or only a portion of the components shown, and the level of integration may vary from device to device.

[0067] Although the present disclosure provides several embodiments, it should be understood that the systems and methods disclosed herein can also be implemented in a variety of other specific forms without departing from the spirit or scope of the present disclosure. The examples herein should be considered illustrative rather than restrictive, and their purpose is not limited to the details given herein. For example, various elements or components can be combined or integrated into another system, or certain features can be omitted or not implemented.

[0068] Furthermore, the techniques, systems, subsystems, and methods described and illustrated in various embodiments in a dispersed or separate manner may also be combined or integrated into other systems, modules, techniques, or methods without departing from the scope of the present disclosure. Other objects that are coupled or directly coupled or communicate with each other in the illustrations or discussions may also be indirectly coupled or communicated through some interface, device, or intermediate component (whether electrical, mechanical, or other nature). Other examples of changes, substitutions, and modifications may be determined by those skilled in the art without departing from the spirit and scope disclosed herein.

Claims

1. A communication method, characterized in that: include: According to the 40MHz subcarrier planning, Orthogonal Frequency Division Multiple Access (OFDMA) frames are transmitted; The 40MHz subcarrier planning includes: 12 guard subcarriers, a first group of subcarriers, 5 DC subcarriers, a second group of subcarriers and 11 guard subcarriers; The first group of subcarriers is located between the 12 guard subcarriers and the 5 DC subcarriers, the 5 DC subcarriers are located between the first group of subcarriers and the second group of subcarriers, and the second group of subcarriers is located between the 5 DC subcarriers and the 11 guard subcarriers; The first group of subcarriers includes nine 26-subcarrier resource units (RUs), and the second group of subcarriers includes nine 26-subcarrier RUs.

2. The method according to claim 1, characterized in that The first group of subcarriers further includes 8 residual subcarriers, and the second group of subcarriers further includes 8 residual subcarriers.

3. The method according to claim 2, characterized in that At least one residual subcarrier is adjacent to the 12 guard subcarriers; At least one residual subcarrier is adjacent to the five DC subcarriers; At least one residual subcarrier is adjacent to the 11 guard subcarriers.

4. A communication device, characterized in that: include: A processing unit and a transceiver unit communicatively connected to the processing unit; The processing unit is used to control the transceiver unit to perform the following operations; The transceiver unit is used to transmit an Orthogonal Frequency Division Multiple Access (OFDMA) frame according to the 40MHz subcarrier planning; The 40MHz subcarrier planning includes: 12 guard subcarriers, a first group of subcarriers, 5 DC subcarriers, a second group of subcarriers and 11 guard subcarriers; The first group of subcarriers is located between the 12 guard subcarriers and the 5 DC subcarriers, the 5 DC subcarriers are located between the first group of subcarriers and the second group of subcarriers, and the second group of subcarriers is located between the 5 DC subcarriers and the 11 guard subcarriers; The first group of subcarriers includes nine 26-subcarrier resource units (RUs), and the second group of subcarriers includes nine 26-subcarrier RUs.

5. The communication device according to claim 4, characterized in that: The first group of subcarriers further includes 8 residual subcarriers, and the second group of subcarriers further includes 8 residual subcarriers.

6. The communication device according to claim 5, characterized in that: At least one residual subcarrier is adjacent to the 12 guard subcarriers; At least one residual subcarrier is adjacent to the five DC subcarriers; At least one residual subcarrier is adjacent to the 11 guard subcarriers.

7. A communication chip, characterized in that: include: a processing circuit and a transceiver interface in communication with the processing circuit; The processing circuit is used to control the transceiver interface to perform the following operations; The transceiver interface is used to transmit orthogonal frequency division multiple access (OFDMA) frames according to the 40MHz subcarrier planning; The 40MHz subcarrier planning includes: 12 guard subcarriers, a first group of subcarriers, 5 DC subcarriers, a second group of subcarriers and 11 guard subcarriers; The first group of subcarriers is located between the 12 guard subcarriers and the 5 DC subcarriers, the 5 DC subcarriers are located between the first group of subcarriers and the second group of subcarriers, and the second group of subcarriers is located between the 5 DC subcarriers and the 11 guard subcarriers; The first group of subcarriers includes nine 26-subcarrier resource units (RUs), and the second group of subcarriers includes nine 26-subcarrier RUs.

8. The communication chip according to claim 7, characterized in that: The first group of subcarriers further includes 8 residual subcarriers, and the second group of subcarriers further includes 8 residual subcarriers.

9. The communication chip according to claim 8, characterized in that: At least one residual subcarrier is adjacent to the 12 guard subcarriers; At least one residual subcarrier is adjacent to the five DC subcarriers; At least one residual subcarrier is adjacent to the 11 guard subcarriers.

10. A communication method, characterized in that: include: According to the 40MHz subcarrier planning, Orthogonal Frequency Division Multiple Access (OFDMA) frames are transmitted; The 40MHz subcarrier planning includes: 12 guard subcarriers, a first 242-subcarrier resource unit (RU), 5 DC subcarriers, a second 242-subcarrier RU and 11 guard subcarriers; The first 242-subcarrier RU is located between the 12 guard subcarriers and the 5 DC subcarriers, the 5 DC subcarriers are located between the first 242-subcarrier RU and the second 242-subcarrier RU, and the second 242-subcarrier RU is located between the 5 DC subcarriers and the 11 guard subcarriers.

11. A communication device, characterized in that: include: A processing unit and a transceiver unit communicatively connected to the processing unit; The processing unit is used to control the transceiver unit to perform the following operations; The transceiver unit is used to transmit an Orthogonal Frequency Division Multiple Access (OFDMA) frame according to the 40MHz subcarrier planning; The 40MHz subcarrier planning includes: 12 guard subcarriers, a first 242-subcarrier resource unit (RU), 5 DC subcarriers, a second 242-subcarrier RU and 11 guard subcarriers; The first 242-subcarrier RU is located between the 12 guard subcarriers and the 5 DC subcarriers, the 5 DC subcarriers are located between the first 242-subcarrier RU and the second 242-subcarrier RU, and the second 242-subcarrier RU is located between the 5 DC subcarriers and the 11 guard subcarriers.

12. A communication chip, characterized in that: include: a processing circuit and a transceiver interface in communication with the processing circuit; The processing circuit is used to control the transceiver interface to perform the following operations; The transceiver interface is used to transmit orthogonal frequency division multiple access (OFDMA) frames according to the 40MHz subcarrier planning; The 40MHz subcarrier planning includes: 12 guard subcarriers, a first 242-subcarrier resource unit (RU), 5 DC subcarriers, a second 242-subcarrier RU and 11 guard subcarriers; The first 242-subcarrier RU is located between the 12 guard subcarriers and the 5 DC subcarriers, the 5 DC subcarriers are located between the first 242-subcarrier RU and the second 242-subcarrier RU, and the second 242-subcarrier RU is located between the 5 DC subcarriers and the 11 guard subcarriers.

13. A communication method, characterized in that: include: According to the 80MHz subcarrier planning, Orthogonal Frequency Division Multiple Access (OFDMA) frames are transmitted; The 80MHz subcarrier planning includes: 12 guard subcarriers, a first group of subcarriers, a second group of subcarriers, a 13-subcarrier portion of a bifurcated 26-subcarrier resource unit (RU), 7 DC subcarriers, another 13-subcarrier portion of the bifurcated 26-subcarrier RU, a third group of subcarriers, a fourth group of subcarriers, and 11 guard subcarriers; The first group of subcarriers is located between the 12 guard subcarriers and the second group of subcarriers, the second group of subcarriers is located between the first group of subcarriers and a 13-subcarrier portion of the bifurcated 26-subcarrier RU, a 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the second group of subcarriers and the 7 DC subcarriers, the 7 DC subcarriers are located between a 13-subcarrier portion of the bifurcated 26-subcarrier RU and another 13-subcarrier portion of the bifurcated 26-subcarrier RU, another 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the 7 DC subcarriers and the third group of subcarriers, the third group of subcarriers is located between another 13-subcarrier portion of the bifurcated 26-subcarrier RU and the fourth group of subcarriers, and the fourth group of subcarriers is located between the third group of subcarriers and the 11 guard subcarriers; The first group of subcarriers includes 9 26-subcarrier RUs, the second group of subcarriers includes 9 26-subcarrier RUs, the third group of subcarriers includes 9 26-subcarrier RUs, and the fourth group of subcarriers includes 9 26-subcarrier RUs.

14. The method according to claim 13, characterized in that The first group of subcarriers further includes 8 residual subcarriers, the second group of subcarriers further includes 8 residual subcarriers, the third group of subcarriers further includes 8 residual subcarriers, and the fourth group of subcarriers further includes 8 residual subcarriers.

15. The method according to claim 14, characterized in that At least one residual subcarrier is located between adjacent 26-subcarrier RUs; At least one residual subcarrier is adjacent to the 12 guard subcarriers; At least one residual subcarrier is adjacent to the 11 guard subcarriers.

16. A communication device, characterized in that: include: A processing unit and a transceiver unit communicatively connected to the processing unit; The processing unit is used to control the transceiver unit to perform the following operations; The transceiver unit transmits an Orthogonal Frequency Division Multiple Access (OFDMA) frame according to the 80 MHz subcarrier planning; The 80MHz subcarrier planning includes: 12 guard subcarriers, a first group of subcarriers, a second group of subcarriers, a 13-subcarrier portion of a bifurcated 26-subcarrier resource unit (RU), 7 DC subcarriers, another 13-subcarrier portion of the bifurcated 26-subcarrier RU, a third group of subcarriers, a fourth group of subcarriers, and 11 guard subcarriers; The first group of subcarriers is located between the 12 guard subcarriers and the second group of subcarriers, the second group of subcarriers is located between the first group of subcarriers and a 13-subcarrier portion of the bifurcated 26-subcarrier RU, a 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the second group of subcarriers and the 7 DC subcarriers, the 7 DC subcarriers are located between a 13-subcarrier portion of the bifurcated 26-subcarrier RU and another 13-subcarrier portion of the bifurcated 26-subcarrier RU, another 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the 7 DC subcarriers and the third group of subcarriers, the third group of subcarriers is located between another 13-subcarrier portion of the bifurcated 26-subcarrier RU and the fourth group of subcarriers, and the fourth group of subcarriers is located between the third group of subcarriers and the 11 guard subcarriers; The first group of subcarriers includes 9 26-subcarrier RUs, the second group of subcarriers includes 9 26-subcarrier RUs, the third group of subcarriers includes 9 26-subcarrier RUs, and the fourth group of subcarriers includes 9 26-subcarrier RUs.

17. The communication device according to claim 16, characterized in that: The first group of subcarriers further includes 8 residual subcarriers, the second group of subcarriers further includes 8 residual subcarriers, the third group of subcarriers further includes 8 residual subcarriers, and the fourth group of subcarriers further includes 8 residual subcarriers.

18. The communication device according to claim 17, characterized in that: At least one residual subcarrier is located between adjacent 26-subcarrier RUs; At least one residual subcarrier is adjacent to the 12 guard subcarriers; At least one residual subcarrier is adjacent to the 11 guard subcarriers.

19. A communication chip, characterized in that: include: a processing circuit and a transceiver interface in communication with the processing circuit; The processing circuit is used to control the transceiver interface to perform the following operations; The transceiver interface transmits an Orthogonal Frequency Division Multiple Access (OFDMA) frame according to the 80 MHz subcarrier planning; The 80MHz subcarrier planning includes: 12 guard subcarriers, a first group of subcarriers, a second group of subcarriers, a 13-subcarrier portion of a bifurcated 26-subcarrier resource unit (RU), 7 DC subcarriers, another 13-subcarrier portion of the bifurcated 26-subcarrier RU, a third group of subcarriers, a fourth group of subcarriers, and 11 guard subcarriers; The first group of subcarriers is located between the 12 guard subcarriers and the second group of subcarriers, the second group of subcarriers is located between the first group of subcarriers and a 13-subcarrier portion of the bifurcated 26-subcarrier RU, a 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the second group of subcarriers and the 7 DC subcarriers, the 7 DC subcarriers are located between a 13-subcarrier portion of the bifurcated 26-subcarrier RU and another 13-subcarrier portion of the bifurcated 26-subcarrier RU, another 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the 7 DC subcarriers and the third group of subcarriers, the third group of subcarriers is located between another 13-subcarrier portion of the bifurcated 26-subcarrier RU and the fourth group of subcarriers, and the fourth group of subcarriers is located between the third group of subcarriers and the 11 guard subcarriers; The first group of subcarriers includes 9 26-subcarrier RUs, the second group of subcarriers includes 9 26-subcarrier RUs, the third group of subcarriers includes 9 26-subcarrier RUs, and the fourth group of subcarriers includes 9 26-subcarrier RUs.

20. The communication chip according to claim 19, characterized in that: The first group of subcarriers further includes 8 residual subcarriers, the second group of subcarriers further includes 8 residual subcarriers, the third group of subcarriers further includes 8 residual subcarriers, and the fourth group of subcarriers further includes 8 residual subcarriers.

21. The communication chip according to claim 20, characterized in that: At least one residual subcarrier is located between adjacent 26-subcarrier RUs; At least one residual subcarrier is adjacent to the 12 guard subcarriers; At least one residual subcarrier is adjacent to the 11 guard subcarriers.

22. A communication method, characterized in that: include: According to the 80MHz subcarrier planning, Orthogonal Frequency Division Multiple Access (OFDMA) frames are transmitted; The 80MHz subcarrier planning includes: 12 guard subcarriers, a first group of 242-subcarrier resource units (RUs), a 13-subcarrier portion of a bifurcated 26-subcarrier RU, 7 DC subcarriers, another 13-subcarrier portion of the bifurcated 26-subcarrier RU, a second group of 242-subcarrier RUs and 11 guard subcarriers; The first group of 242-subcarrier RU is located between the 12 guard subcarriers and a 13-subcarrier portion of the bifurcated 26-subcarrier RU, a 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the first group of 242-subcarrier RU and the 7 DC subcarriers, the 7 DC subcarriers are located between a 13-subcarrier portion of the bifurcated 26-subcarrier RU and another 13-subcarrier portion of the bifurcated 26-subcarrier RU, another 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the 7 DC subcarriers and the second group of 242-subcarrier RU, and the second group of 242-subcarrier RU is located between another 13-subcarrier portion of the bifurcated 26-subcarrier RU and the 11 guard subcarriers; The first group of 242-subcarrier RUs includes two 242-subcarrier RUs, and the second group of 242-subcarrier RUs includes two 242-subcarrier RUs.

23. A communication device, characterized in that: include: A processing unit and a transceiver unit communicatively connected to the processing unit; The processing unit is used to control the transceiver unit to perform the following operations; The transceiver unit is used to transmit an orthogonal frequency division multiple access (OFDMA) frame according to the 80MHz subcarrier planning; The 80MHz subcarrier planning includes: 12 guard subcarriers, a first group of 242-subcarrier resource units (RUs), a 13-subcarrier portion of a bifurcated 26-subcarrier RU, 7 DC subcarriers, another 13-subcarrier portion of the bifurcated 26-subcarrier RU, a second group of 242-subcarrier RUs and 11 guard subcarriers; The first group of 242-subcarrier RU is located between the 12 guard subcarriers and a 13-subcarrier portion of the bifurcated 26-subcarrier RU, a 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the first group of 242-subcarrier RU and the 7 DC subcarriers, the 7 DC subcarriers are located between a 13-subcarrier portion of the bifurcated 26-subcarrier RU and another 13-subcarrier portion of the bifurcated 26-subcarrier RU, another 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the 7 DC subcarriers and the second group of 242-subcarrier RU, and the second group of 242-subcarrier RU is located between another 13-subcarrier portion of the bifurcated 26-subcarrier RU and the 11 guard subcarriers; The first group of 242-subcarrier RUs includes two 242-subcarrier RUs, and the second group of 242-subcarrier RUs includes two 242-subcarrier RUs.

24. A communication chip, characterized in that: include: a processing circuit and a transceiver interface in communication with the processing circuit; The processing circuit is used to control the transceiver interface to perform the following operations; The transceiver interface is used to transmit orthogonal frequency division multiple access (OFDMA) frames according to 80MHz subcarrier planning; The 80MHz subcarrier planning includes: 12 guard subcarriers, a first group of 242-subcarrier resource units (RUs), a 13-subcarrier portion of a bifurcated 26-subcarrier RU, 7 DC subcarriers, another 13-subcarrier portion of the bifurcated 26-subcarrier RU, a second group of 242-subcarrier RUs and 11 guard subcarriers; The first group of 242-subcarrier RU is located between the 12 guard subcarriers and a 13-subcarrier portion of the bifurcated 26-subcarrier RU, a 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the first group of 242-subcarrier RU and the 7 DC subcarriers, the 7 DC subcarriers are located between a 13-subcarrier portion of the bifurcated 26-subcarrier RU and another 13-subcarrier portion of the bifurcated 26-subcarrier RU, another 13-subcarrier portion of the bifurcated 26-subcarrier RU is located between the 7 DC subcarriers and the second group of 242-subcarrier RU, and the second group of 242-subcarrier RU is located between another 13-subcarrier portion of the bifurcated 26-subcarrier RU and the 11 guard subcarriers; The first group of 242-subcarrier RUs includes two 242-subcarrier RUs, and the second group of 242-subcarrier RUs includes two 242-subcarrier RUs.

Images