Communication apparatus and communication method for control signaling

Abstract

To provide a communication apparatus and communication method for control signaling.SOLUTION: A communication apparatus 300 comprises: a receiver which receives Extremely High Throughput (EHT) Physical layer Protocol Data Unit (PPDU) including U-SIG field having Universal Signal (U-SIG) 1 and U-SIG 2 each including the same number of data bits; and a circuit which processes the received EHT PPDU. The EHT PPDU has an EHT-SIG field including a common field and a user specific field which are referred to together as an EHT-SIG content channel. The fields exist in EHT PPDU to be transmitted to single or multiple STAs. When the EHT PPDU is transmitted to a single STA, the user specific field has a single user field.SELECTED DRAWING: Figure 3A

Description

[Technical Field]

[0001] The present disclosure relates to a communication device and a communication method for performing control signaling, and more particularly to a communication device and a communication method for performing control signaling in an EHT WLAN (Very High Throughput Wireless Local Area Network). [Background technology]

[0002] In the standardization of next-generation wireless local area networks (WLANs), a new radio access technology that is backward compatible with IEEE 802.11a / b / g / n / ac / ax technologies is being considered within the IEEE 802.11 Working Group and is named Extremely High Throughput (EHT) WLAN.

[0003] EHT WLANs are expected to support multi-band operation, increasing the maximum channel bandwidth from 160 MHz to 320 MHz, increasing the maximum number of spatial streams from 8 to 16, and supporting multi-band operation, with the aim of providing significant increases in peak throughput and capacity over 802.11ax high-efficiency (HE) WLANs. Furthermore, it has been proposed to enable preamble puncturing of physical layer protocol data units (PPDUs) transmitted to a single communication device, with the aim of improving spectral efficiency over 802.11ax HE WLANs. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] IEEE 802.11-19 / 1593r0 Summary of the Invention [Problem to be solved by the invention]

[0005] However, communication devices and methods for control signaling, particularly supporting efficient signaling of preamble puncturing of PPDUs transmitted to a single communication device in the context of EHT WLANs, have not been discussed to date.

[0006] Therefore, there is a need for a communication device and a communication method that provides a viable technical solution for control signaling in the context of an EHT WLAN. Furthermore, other desirable features and characteristics will become apparent from the following detailed description and appended claims, taken in conjunction with the accompanying drawings and the background art herein. [Means for solving the problem]

[0007] The non-limiting exemplary embodiments facilitate providing a communications apparatus and method for control signaling in the context of an EHT WLAN.

[0008] According to one embodiment of the present disclosure, there is provided a communications device comprising: a circuit that, in operation, generates a transmission signal including a first signal field having a first portion and a second portion, each portion including the same number of data bits; and a transmitter that, in operation, transmits the generated transmission signal, wherein the data bits of the second portion of the first signal field do not include version-independent bits.

[0009] According to another embodiment of the present disclosure, there is provided a communications device comprising: a receiver that, in operation, receives a transmission signal including a first signal having a first portion and a second portion, each portion including the same number of data bits; and circuitry that, in operation, processes the received transmission signal, wherein the data bits of the second portion of the first signal field do not include version-independent bits.

[0010] According to yet another embodiment of the present disclosure, there is provided a communication method, comprising: generating a transmission signal including a first signal field having a first portion and a second portion, each portion including the same number of data bits; and transmitting the generated transmission signal, wherein the second portion of the first signal field does not include a version-independent bit.

[0011] It should be noted that the general or specific embodiments may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any combination thereof.

[0012] Further benefits and advantages of the disclosed embodiments will become apparent from the specification and drawings. These benefits and / or advantages may be obtained individually by the various embodiments and features of the specification and drawings, and it is not necessary for all of these features to be present in order to obtain one or more of such benefits and / or advantages. [Brief explanation of the drawings]

[0013] Embodiments of the present disclosure will be better understood and readily apparent to those of ordinary skill in the art upon reading the following description, given by way of example only, and upon reference to the drawings in which: [Figure 1A] 1 shows a schematic diagram of uplink and downlink single-user (SU) MIMO communication between an access point (AP) and a station (STA) in a multiple-input multiple-output (MIMO) wireless network. [Figure 1B] 1 shows a schematic diagram of downlink multi-user communication between an AP and multiple STAs in a MIMO wireless network. [Figure 1C] 1 shows a schematic diagram of trigger-based uplink MU communication between an AP and multiple STAs in a MIMO wireless network. [Figure 1D]1 shows a schematic diagram of trigger-based downlink multi-AP MIMO communication between multiple APs and STAs in a MIMO wireless network. [Figure 2A] 1 shows an example of a format of a PPDU (Physical Layer Protocol Data Unit) used for uplink and downlink SU communication between an AP and a STA in a HE WLAN. [Figure 2B] 1 shows an example of a format of a PPDU used for downlink multi-user (MU) communication between an AP and multiple STAs in a HE WLAN. [Figure 2C] 1 shows the HE-SIG-B fields in detail. [Figure 2D] 1 illustrates an example of a format of a PPDU used for trigger-based uplink MU communication between an AP and multiple STAs in a HE WLAN. [Figure 3A] 1 illustrates a schematic example of a communication device according to various embodiments, which may be implemented as an AP or a STA and may be configured to perform control signaling according to various embodiments of the present disclosure. [Figure 3B] 1 shows a flowchart illustrating a communication method according to various embodiments. [Figure 4A] 1 shows a flowchart illustrating downlink communications according to one embodiment. [Figure 4B] 10 shows a flowchart illustrating downlink communication according to another embodiment. [Figure 5A] 1 shows an example of the format of the EHT basic PPDU for non-trigger-based communication. [Figure 5B] 1 shows the U-SIG fields in detail. [Figure 5C] 1 shows two examples of the EHT-SIG field when an EHT basic PPDU is transmitted to a single STA. [Figure 5D] 1 shows two examples of the EHT-SIG field when an EHT basic PPDU is transmitted to a single STA. [Figure 5E] 10 is a table illustrating how the number of EHT-SIG content channels depends on the bandwidth and the value of L, according to various embodiments. [Figure 5F] 10 shows a diagram of the mapping of one or two EHT-SIG content channels when a 40MHz EHT basic PPDU is transmitted to multiple STAs. [Figure 5G] 10 shows a diagram of the mapping of two EHT-SIG content channels when an 80MHz EHT basic PPDU is transmitted to multiple STAs. [Figure 5H] 1 shows a diagram of the mapping of two EHT-SIG content channels when an 80+80MHz or 160MHz EHT basic PPDU is transmitted to multiple STAs. [Figure 5I] 10 shows a diagram of the mapping of two EHT-SIG content channels when a 160+160MHz or 320MHz EHT basic PPDU is transmitted to multiple STAs. [Figure 5J] 1 shows two examples of EHT-SIG content channels when an EHT basic PPDU is transmitted to multiple STAs. [Figure 5K] 1 shows two examples of EHT-SIG content channels when an EHT basic PPDU is transmitted to multiple STAs. [Figure 6] 1 shows an example of the format of an EHT TB PPDU. [Figure 7A] 1 shows an example of the format of an EHT SU PPDU. [Figure 7B] 1 shows an example of the format of an EHT MU PPDU. [Figure 7C] 1 shows a diagram of the mapping of two U-SIG content channels in a 40MHz EHT SU PPDU or EHT MU PPDU. [Figure 7D] 1 shows a diagram of the mapping of two U-SIG content channels in an 80MHz EHT SU PPDU or EHT MU PPDU. [Figure 7E] 1 shows a diagram of the mapping of two U-SIG content channels in an 80+80MHz or 160MHz EHT SU PPDU or EHT MU PPDU. [Figure 7F] 1 shows a diagram of the mapping of two U-SIG content channels in a 160+160MHz or 320MHz EHT SU PPDU or EHT MU PPDU. [Figure 7G] U-SIG Content Channel 1 is shown in detail. [Figure 7H] U-SIG Content Channel 2 is shown in detail. [Figure 7I] 1 shows an example of an EHT-SIG content channel in an EHT MU PPDU. [Figure 8] 1 shows an example of another format of the EHT TB PPDU. [Figure 9] 1 illustrates the configuration of a communication device, for example, an AP, according to various embodiments. [Figure 10] 1 illustrates the configuration of a communication device, for example, a STA, according to various embodiments.

[0014] Those skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some elements in the illustrations, block diagrams, or flow charts may be exaggerated relative to other elements to facilitate an accurate understanding of embodiments of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Some embodiments of the present disclosure will now be described, by way of example only, with reference to the following figures in which like reference numbers and characters indicate similar or equivalent elements:

[0016] In the following paragraphs, certain exemplary embodiments are described with particular reference to access points (APs) and stations (STAs) providing uplink or downlink control signaling in a multiple-input multiple-output (MIMO) wireless network.

[0017] In the context of IEEE 802.11 (Wi-Fi) technology, a station (also synonymously referred to as a STA) is a communication device capable of using the 802.11 protocol. Based on the definition in IEEE 802.11-2016, a STA can be any device that includes an IEEE 802.11-compliant medium access control (MAC) and physical layer (PHY) interface to the wireless medium (WM).

[0018] An STA may be, for example, a notebook, desktop personal computer (PC), personal digital assistant (PDA), access point, or Wi-Fi phone in a wireless local area network (WLAN) environment. An STA may be stationary or mobile. In a WLAN environment, the terms "STA," "wireless client," "user," "user device," and "node" are often used synonymously.

[0019] Similarly, an AP (also known synonymously as a Wireless Access Point (WAP) in the context of IEEE 802.11 (Wi-Fi) technology) is a communications device that allows STAs in a WLAN to connect to a wired network. APs are typically connected to a router (through the wired network) as standalone devices, but APs can also be integrated with or used within a router.

[0020] As mentioned above, a STA in a WLAN can function as an AP at other times, and vice versa. This is because a communication device in the context of IEEE 802.11 (Wi-Fi) technology can include both STA and AP hardware elements. In this way, the communication device can switch between STA mode and AP mode based on the conditions and / or requirements of the actual WLAN.

[0021] In a MIMO wireless network, "multiple" refers to multiple antennas used simultaneously for transmission over a wireless channel and multiple antennas used simultaneously for reception. In this regard, "multiple-input" refers to multiple transmitter antennas that input wireless signals into a channel, and "multiple-output" refers to multiple receiver antennas that receive wireless signals from the channel into a receiver. For example, in an N×M MIMO network system, N is the number of transmitter antennas and M is the number of receiver antennas, and N may or may not be equal to M. For purposes of brevity, this disclosure will not further discuss the number of transmitter antennas and the number of receiver antennas.

[0022] In a MIMO wireless network, single-user (SU) and multi-user (MU) communications can be deployed between communication devices such as APs and STAs. MIMO wireless networks offer advantages such as spatial multiplexing and spatial diversity, which achieve higher data rates and robustness by using multiple spatial streams. According to various embodiments, the term "spatial stream" may be used interchangeably with the term "space-time stream" (or STS).

[0023] 1A shows a schematic diagram of single-user (SU)-MIMO communication 100 between an AP 102 and a STA 104 in a MIMO wireless network. As shown, the MIMO wireless network may include one or more STAs (e.g., STA 104, STA 106, etc.). In SU-MIMO communication 100, the AP 102 transmits multiple space-time streams using multiple antennas (e.g., four antennas as shown in FIG. 1A), with all space-time streams directed to a single communication device (i.e., STA 104). For simplicity, the multiple space-time streams directed to STA 104 are shown as a combined data transmission arrow 108 directed to STA 104.

[0024] SU-MIMO communication 100 can be configured for bidirectional transmission. As shown in FIG. 1A, in SU-MIMO communication 100, STA 104 can transmit multiple space-time streams using multiple antennas (e.g., two antennas as shown in FIG. 1A), with all space-time streams directed to AP 102. For simplicity, the multiple space-time streams directed to AP 102 are shown as a combined data transmission arrow 110 directed to AP 102.

[0025] Thus, the SU-MIMO communication 100 depicted in FIG. 1A allows for both uplink and downlink SU transmissions in a MIMO wireless network.

[0026] 1B shows a schematic diagram of downlink MU communication 112 between an AP 114 and multiple STAs 116, 118, and 120 in a MIMO wireless network. The MIMO wireless network may include one or more STAs (e.g., STA 116, STA 118, STA 120, etc.). In downlink MU communication 112, the AP 114 uses multiple antennas via spatial mapping or precoding techniques to simultaneously transmit multiple streams in the same resource unit (RU) and / or different RUs to the STAs 116, 118, and 120 in the network. For example, two space-time streams may be directed to STA 118, another space-time stream to STA 116, and yet another space-time stream to STA 120. For purposes of simplicity, the two space-time streams directed to STA 118 are shown as a combined data transmission arrow 124, the space-time stream directed to STA 116 is shown as data transmission arrow 122, and the space-time stream directed to STA 120 is shown as data transmission arrow 126.

[0027] To enable uplink MU transmissions, trigger-based communication is provided in a MIMO wireless network. In this regard, Figure 1C illustrates a schematic diagram of trigger-based uplink MU communication 128 between an AP 130 and multiple STAs 132, 134, and 136 in a MIMO wireless network.

[0028] Because multiple STAs 132, 134, and 136 participate in trigger-based uplink MU communications, the AP 130 must coordinate the simultaneous transmissions of the multiple STAs 132, 134, and 136.

[0029] 1C , the AP 130 simultaneously transmits trigger frames 139, 141, and 143 to the STAs 132, 134, and 136 to indicate user-specific resource allocation information (e.g., the number of space-time streams, the starting STS number, and the assigned RUs) that each STA can use. In response to the trigger frames, the STAs 132, 134, and 136 can simultaneously transmit their respective space-time streams to the AP 130 according to the user-specific resource allocation information indicated in the trigger frames 139, 141, and 143. For example, two space-time streams may be directed from the STA 134 to the AP 130, another space-time stream may be directed from the STA 132 to the AP 130, and yet another space-time stream may be directed from the STA 136 to the AP 130. For simplicity, the two space-time streams directed from STA 134 to AP 130 are shown as a combined data transmission arrow 140, the space-time stream directed from STA 132 to AP 130 is shown as data transmission arrow 138, and the space-time stream directed from STA 136 to AP 130 is shown as data transmission arrow 142.

[0030] Trigger-based communication is also provided in MIMO wireless networks to enable downlink multi-AP communication. In this regard, Figure 1D shows a schematic diagram of downlink multi-AP communication 144 between a STA 150 and multiple APs 146, 148 in a MIMO wireless network.

[0031] Because multiple APs 146, 148 participate in trigger-based downlink multi-AP MIMO communication, the master AP 146 must coordinate the simultaneous transmissions of the multiple APs 146, 148.

[0032] 1D , the master AP 146 simultaneously transmits trigger frames 147 and 153 to the AP 148 and the STA 150, indicating AP-specific resource allocation information (e.g., the number of space-time streams, the starting STS stream number, and the assigned RUs) that each AP can use. In response to the trigger frames, the APs 146 and 148 can transmit their respective space-time streams to the STA 150 according to the AP-specific resource allocation information indicated in the trigger frame 147. The STA 150 can receive all the space-time streams according to the AP-specific resource allocation information indicated in the trigger frame 153. For example, two space-time streams are directed from the AP 146 to the STA 150, and two other space-time streams are directed from the AP 148 to the STA 150. For simplicity, the two space-time streams directed from AP 146 to STA 150 are shown as a combined data transmission arrow 152, and the two space-time streams directed from AP 148 to STA 150 are shown as a combined data transmission arrow 154.

[0033] In 802.11 WLANs, due to the packet / PPDU (Physical Layer Protocol Data Unit) based transmission and distributed MAC (Medium Access Control) scheme, there is no time scheduling (allocation of periodic time slots for data transmission as in TDMA (Time Division Multiple Access)). Scheduling of frequency and spatial resources is performed on a packet-by-packet basis. In other words, resource allocation information is PPDU-based.

[0034] 2A shows an example of the format of a PPDU 156 used for single-user communication between an AP and a STA in an HE WLAN. Such a PPDU 156 is referred to as an HE SU PPDU 156. The HE SU PPDU 156 may include a non-High Throughput Short Training field (L-STF), a non-High Throughput Long Training field (L-LTF), a non-High Throughput SIGNAL (L-SIG) field, a Repeated L-SIG (RL-SIG) field, an HE SIGNAL A (HE-SIG-A) field 158, an HE Short Training field (HE-STF), an HE Long Training field (HE-LTF), a Data field 170, and a Packet Extension (PE) field. The RL-SIG field is primarily used to identify the format of the HE PPDU. The HE-SIG-A field 158 contains control information necessary to decode the Data field, such as uplink / downlink, modulation coding scheme (MCS), and bandwidth (BW).

[0035] 2B shows an example format of a PPDU 160 used for downlink MU communications between an AP and multiple STAs in an HE WLAN, such as OFDMA (Orthogonal Frequency Division Multiple Access) transmissions, including MU-MIMO transmissions in a single resource unit (RU) and full-bandwidth MU-MIMO transmissions. Such a PPDU 160 is referred to as an HE MU PPDU 160. The HE MU PPDU has a format similar to the HE SU PPDU, but may include an HE Signal B (HE-SIG-B) field 166. In particular, the HE MU PPDU 160 may include an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, an HE-SIG-A field 162, an HE-SIG-B field 166, an HE-STF field, an HE-LTF field, a Data field 170, and a PE field. In the HE MU PPDU 160, the HE-SIG-B field 166 provides OFDMA and MU-MIMO resource allocation information so that STAs can identify the corresponding resources to use in the Data field 170, as indicated by arrow 168. The HE-SIG-A field 162 contains information necessary to decode the HE-SIG-B field 166 (e.g., the MCS of the HE-SIG-B, the number of HE-SIG-B symbols), as indicated by arrow 164.

[0036] 2C shows the HE-SIG-B field 166 in more detail. The HE-SIG-B field 166 includes (or consists of) a Common field 172 (if present) followed by a User Specific field 174, collectively referred to as the HE-SIG-B content channel. The HE-SIG-B field 166 includes an RU Allocation subfield that indicates RU information for each allocation. The RU information includes the location of the RU in the frequency domain, an indication of the RUs allocated for non-MU-MIMO or MU-MIMO allocation, and the number of users in the MU-MIMO allocation. The Common field 172 is not present in the case of full-band MU-MIMO transmission. In this case, RU information (e.g., the number of users in the MU-MIMO allocation) is signaled in the HE-SIG-A field 162.

[0037] User Specific field 174 includes (or consists of) one or more User fields for non-MU-MIMO and / or MU-MIMO assignments. The User fields include user information (i.e., user-specific assignment information) that indicates a user-specific assignment. In the example shown in FIG. 2C , User Specific field 174 includes five User fields (User Field 0, ..., User Field 4), where user-specific assignment information for an assignment (Allocation 0) is provided by User Field 0, user-specific assignment information for a further assignment (Allocation 1, which includes three MU-MIMO users) is provided by User Field 1, User Field 2, and User Field 3, and user-specific assignment information for a further assignment (Allocation 2) is provided by User Field 4.

[0038] FIG. 2D shows the format of a PPDU 180 used for uplink MU communication between an AP and multiple STAs in an HE WLAN. Such a PPDU 180 is referred to as an HE TB (trigger-based) PPDU 180. The HE TB PPDU may have a format similar to that of an HE SU PPDU. Specifically, the HE TB PPDU 180 may include an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, an HE-SIG-A field 182, an HE-STF field, an HE-LTF field, a Data field, and a PE field. The HE-STF of the HE TB PPDU 180 has a duration of 8 μs. The HE TB PPDU 180 is used for uplink MU transmission in response to a trigger frame. Instead of using the HE-SIG-B field, the information required for uplink MU transmission from one or more STAs is conveyed by the trigger frame requesting this transmission. In a typical transmission of the HE TB PPDU 180 , the HE-SIG-A related information is copied from the requesting trigger frame into the HE-SIG-A field 182 of the HE TB PPDU 180 .

[0039] In 11ax HE WLANs, only preamble puncturing of PPDUs transmitted to multiple STAs is permitted. With the maximum channel bandwidth increased from 160 MHz to 320 MHz and the maximum number of spatial streams increased from 8 to 16, an object of the present disclosure is to substantially overcome the existing problem of providing a communication apparatus and a communication method that perform control signaling to enable preamble puncturing of PPDUs transmitted to a single STA in order to improve the spectral efficiency of EHT WLANs over 11ax HE WLANs.

[0040] According to various embodiments, an EHT WLAN supports non-triggered communication, such as that shown in Figures 1A and 1B, and triggered communication, such as that shown in Figures 1C and 1D. In non-triggered communication, a communication device transmits a PPDU to one or more other communication devices without an explicit request. In triggered communication, a communication device transmits a PPDU to one or more other communication devices only after receiving a requesting trigger frame.

[0041] 3A illustrates a partially boxed schematic diagram of a communication device 300 according to various embodiments. The communication device 300 can be implemented as an AP or a STA according to various embodiments.

[0042] 3A, the communications device 300 may include circuitry 314, at least one wireless transmitter 302, at least one wireless receiver 304, and at least one antenna 312 (only one antenna is depicted in FIG. 3A for purposes of illustration for simplicity). The circuitry 314 may include at least one controller 306 for use in performing, with the assistance of software and hardware, the tasks that the at least one controller 306 is designed to perform, including controlling communications with one or more other communications devices in a MIMO wireless network. The circuitry 314 may further include at least one transmit signal generator 308 and at least one receive signal processor 310. The at least one controller 306 can control the at least one transmit signal generator 308 to generate PPDUs to be transmitted to one or more other communication devices via the at least one wireless transmitter 302 (e.g., PPDUs used for non-triggered communication or PPDUs used for triggered multi-AP joint transmission if the communication device 300 is an AP, and PPDUs used for non-triggered communication or PPDUs used for triggered uplink transmission if the communication device 300 is an STA, for example), and can also control the at least one receive signal processor 310 to process PPDUs received from one or more other communication devices through the at least one wireless receiver 304 under the control of the at least one controller 306 (e.g., PPDUs used for non-triggered communication or PPDUs used for triggered uplink transmission if the communication device 300 is an AP, and PPDUs used for non-triggered communication or PPDUs used for triggered multi-AP joint transmission if the communication device 300 is an STA, for example). The at least one transmit signal generator 308 and the at least one receive signal processor 310 may be standalone modules of the communication device 300 that communicate with the at least one controller 306 for the functions described above, as shown in FIG. 3A.Alternatively, the at least one transmit signal generator 308 and the at least one receive signal processor 310 may be included in the at least one controller 306. Those skilled in the art will appreciate that the arrangement of these functional modules is flexible and may vary according to actual needs and / or requirements. The data processing unit, storage unit, and other related control units may be provided on an appropriate circuit board and / or chipset. In various embodiments, in operation, the at least one wireless transmitter 302, the at least one wireless receiver 304, and the at least one antenna 312 may be controlled by the at least one controller 306.

[0043] In operation, the communications device 300 provides functionality necessary for control signaling in non-trigger-based communications and trigger-based communications. For example, the communications device 300 may be an AP, and the circuit 314 (e.g., at least one transmit signal generator 308 of the circuit 314) may, in operation, generate a transmit signal (e.g., a PPDU used for non-trigger-based communications or a PPDU used for trigger-based multi-AP joint transmission), the transmit signal including a first signal field having a first portion and a second portion, each portion including the same number of data bits, and the data bits in the second portion of the first signal field do not include version-independent bits. In operation, the wireless transmitter 302 may transmit the generated transmit signal to one or more other communications devices.

[0044] The communication device 300 may be a STA, and the wireless receiver 304, in operation, can receive a transmission signal (e.g., a PPDU used for non-triggered communication or a PPDU used for triggered multi-AP joint transmission) from another communication device (e.g., an AP), the transmission signal including a first signal field having a first portion and a second portion, each portion including the same number of data bits, and the data bits of the second portion of the first signal field do not include version-independent bits. The circuit 314 (e.g., at least one receive signal processor 310 of the circuit 314), in operation, can process the received transmission signal.

[0045] 3B shows a flowchart 316 illustrating a communications method for transmitting control signaling, according to various embodiments. In step 318, a transmission signal is generated, the transmission including a first signal field having a first portion and a second portion, each portion including the same number of data bits, and the data bits in the second portion of the first signal field do not include version-independent bits. In step 320, the generated transmission signal is transmitted to one or more other communications devices.

[0046] In one embodiment, the first signal field of the transmission signal has a single format in non-triggered communication with one or more other communication devices (e.g., STAs). In another embodiment, the transmission signal includes a second signal field having a portion of the version-dependent bits in non-triggered communication. In such an embodiment, the second signal field has a format when the transmission signal is transmitted to one other communication device and a different format when the transmission signal is transmitted to multiple other communication devices. In one embodiment, when the transmission signal is transmitted to one other communication device, the second signal field can include a preamble puncturing bitmap. In yet another embodiment, the first signal field includes information for interpreting the second signal field. This advantageously enables preamble puncturing of PPDUs transmitted to one communication device, enabling efficient signaling support for EHT WLAN over 11ax HE WLAN and improving spectral efficiency.

[0047] In the following paragraphs, a particular exemplary embodiment is described with reference to an AP and multiple STAs providing control signaling to enable preamble puncturing of PPDUs transmitted to a single communication device in non-triggered communication.

[0048] 4A shows a flowchart 400 illustrating downlink communications between an AP 402 and a single communication device 404 or between the AP 402 and multiple communication devices (e.g., STAs 404, 406) according to one embodiment. A contention-based channel access procedure, such as an enhanced distributed channel access (EDCA) procedure, is indicated by block 408, and short interframe spacing (SIFS) 411 is shown. The AP 402 can generate a transmission signal (e.g., an EHT basic PPDU) 410 including a first signal field having a first portion and a second portion, each portion including the same number of data bits, where the data bits in the second portion of the first signal field do not include version-independent bits. The first signal field of the transmission signal 410 can have a single format regardless of whether the transmission signal 410 is transmitted to the STA 404 or the STAs 404, 406. In one embodiment, the transmission signal 410 may include a second signal field including a portion of the version-dependent bits. When communicating with multiple or more communication devices, such as the STAs 404 and 406, the second signal field of the transmission signal 410 may have a different format than the format of the transmission signal 410 transmitted to a single communication device, such as the STA 404. In one embodiment, when the transmission signal 410 is transmitted to the STA 404, the second signal field may include a preamble puncturing bitmap. In yet another embodiment, the first signal field includes information for interpreting the second signal field. The wireless transmitter of the AP 402 may transmit the generated transmission signal 410 to the STA 404 or the STAs 404 and 406.

[0049] In IEEE 802.11 networks, a SIFS is the time interval before an acknowledgement is transmitted by a STA. After the last symbol of a transmission 410 is transmitted, a SIFS 411 is valid, and at 412, when the transmission 410 is transmitted to STAs 404 and 406, the radio transmitters of the STAs 404 and 406 can simultaneously transmit their respective block acknowledgement (BA) frames 414 and 415, or when the transmission 410 is transmitted to STA 404, the radio transmitter of STA 404 can transmit the BA frame 414.

[0050] According to the present disclosure, the EHT Basic PPDU can be used for non-trigger-based SU or MU communications. Figure 5A shows an example format of an EHT Basic PPDU 500. The EHT Basic PPDU 500 includes an L-STF field, an L-LTF field, an L-SIG field, a RL-SIG field, a universal signal (U-SIG) field 502, an EHT signal (EHT-SIG) field 504, an EHT-STF field, an EHT-LTF field, a data field, and a PE field. The L-STF field, the L-LTF field, the L-SIG field, the RL-SIG field, the U-SIG field, and the EHT-SIG field can be grouped as pre-EHT modulated fields, and the EHT-STF field, the EHT-LTF field, the data field, and the PE field can be grouped as EHT modulated fields. Both the U-SIG field 502 and the EHT-SIG field 504 are present in an EHT Basic PPDU transmitted to a single STA or multiple STAs.

[0051] According to various embodiments, the U-SIG field 502 has a duration of two OFDM (Orthogonal Frequency Division Multiplexing) symbols. The data bits of the U-SIG field 502 are jointly coded and modulated, similar to the HE-SIG-A field of 802.11ax. The modulated data bits of the U-SIG field 502 are mapped to 52 data tones in each of the two OFDM symbols and replicated for each 20 MHz frequency segment, similar to the HE-SIG-A field of 802.11ax. An example transmission of the U-SIG field 502 when the bandwidth of the EHT basic PPDU 500 is 80 MHz is shown in FIG. 5B.

[0052] In various embodiments, the U-SIG field 502 has the same format regardless of whether the EHT basic PPDU 500 is transmitted to a single STA or multiple STAs. The U-SIG field 502 has two parts, U-SIG1 and U-SIG2, each containing 26 data bits. The U-SIG field 502 includes all version-independent bits and some version-dependent bits. All version-independent bits are included in U-SIG1 and have static positions and bit definitions across different physical layer (PHY) versions. The version-independent bits include a PHY version identifier (3 bits), an uplink / downlink (UL / DR) flag (1 bit), a basic service set (BSS) color (e.g., 6 bits), and a transmit opportunity (TXOP) duration (e.g., 7 bits). The PHY version identifier in the version-independent bits is used to identify the exact PHY version starting with 802.11be. The effect of including all version-independent bits in one part of the U-SIG field 502 (i.e., U-SIG1) is that legacy STAs only need to parse U-SIG1, thus improving their power efficiency. On the other hand, the version-dependent bits may have variable bit definitions for each PHY version. The part of version-dependent bits included in the U-SIG field 502 may include PPDU format, SU / MU flag, BW, as well as EHT-SIG-related bits used to interpret the EHT-SIG field 504 and spatial reuse-related bits used for coexistence with unintended STAs.

[0053] An example format of the U-SIG field 502 is shown in Table 1. As described above, the U-SIG field 502 includes two parts, U-SIG1 and U-SIG2, each of which includes 26 data bits. U-SIG1 includes a PHY Version Identifier field, a UL / DL Flag field, a BSS Color field, a TXOP Duration field, a PPDU Format field, a SU / MU Flag field, and a BW field. U-SIG2 includes an EHT-SIG Compression field, an EHT-SIG EHT MCS field, an EHT-SIG Dual sub-Carrier Modulation (DCM) field, a Number Of EHT-SIG Symbols Or MU-MIMO Users field, and a Spatial Reuse field, followed by spare bits, a Cyclic Redundancy Check (CRC) field for error detection, and tail bits. It will be apparent to those of ordinary skill in the art that, unless otherwise specified herein, the standard definitions, protocols, and functions of most of the fields in U-SIG field 502 listed in Table 1 are derived from the 802.11ax specification.

[0054] According to the present disclosure, when the PHY Version Identifier field indicates 802.11be, the PPDU Format field is set to "0" for EHT Basic PPDU and "1" for EHT TB PPDU. When the PPDU Format field is set to "0" indicating EHT Basic PPDU, the SU / MU Flag field is set to "0" for EHT Basic PPDU transmitted to a single STA and "1" for EHT Basic PPDU transmitted to multiple STAs. Preamble puncturing mode is only allowed when the PPDU bandwidth is 80 MHz or greater. Therefore, the BW field is set to "0" for 20 MHz, "1" for 40 MHz, "2" for 80 MHz no-preamble puncturing mode, "3" for 160 MHz and 80+80 MHz no-preamble puncturing mode, "4" for 320 MHz and 160+160 MHz no-preamble puncturing mode, "5" for 80 MHz preamble puncturing mode, "6" for 160 MHz and 80+80 MHz preamble puncturing mode, and "7" for 320 MHz and 160+160 MHz preamble puncturing mode. [Table 1]

[0055] Returning to FIG. 5A , the EHT-SIG field 504 of the EHT Basic PPDU 500 can contain the remaining version-dependent bits. The EHT-SIG field 504 has a variable MCS and a variable length. The EHT-SIG field 504 has a Common field followed by a User Specific field, collectively referred to as the EHT-SIG content channel. Unlike the U-SIG field 502, the format of the EHT-SIG field 504 depends on whether the EHT Basic PPDU 500 is being transmitted to a single STA or multiple STAs. The following describes the differences in the format of the EHT-SIG when transmitted to a single STA and when transmitted to multiple STAs.

[0056] When an EHT Basic PPDU is transmitted to a single STA, the Common field of the EHT-SIG field 504 contains a single Common field 1, and the User Specific field contains a single User field. Furthermore, regardless of the BW of the EHT Basic PPDU, there is one EHT-SIG content channel, replicated for each 20 MHz frequency segment. The Common field and the User Specific field can be coded separately or jointly, resulting in two different EHT-SIG field format options. Figure 5C shows an example format of the EHT-SIG field 504 when the Common field 506 and the User Specific field 508 are coded separately (Option 1) when an EHT Basic PPDU is transmitted to a single STA. The Common field 506 contains one Common field 1 506a, and the User Specific field 508 contains one User field 508a. The Common field 506 and the User Specific field 508 are coded separately, resulting in a CRC field and tail bits being added to the Common field 1 506a of the Common field 506 and the User field 508a of the User Specific field 508, respectively, as shown in Figure 5C.

[0057] 5D shows an example of another format of the EHT-SIG field 504 when the Common field 506 and the User Specific field 508 are jointly coded when an EHT Basic PPDU is transmitted to a single STA (Option 2). In this embodiment, the EHT-SIG field 504 includes a single Common field 1 506a in the Common field 506, followed by a single User field 508a in the User Specific field 508, with a CRC field and tail bits appended to field 508a. This jointly coded EHT-SIG field format advantageously reduces the number of CRC fields and tail bits used in the EHT-SIG field, thus reducing signaling overhead.

[0058] Example formats of Common Field 1 506a and User Field 508a when the EHT Basic PPDU 500 is transmitted to a single STA are shown in Table 13 and Table 2, respectively. Common Field 1 506a may include a Low Density Parity Check (LDPC) Extra Symbol Segment subfield, a Pre-FEC Padding Factor subfield, a PE Disambiguity subfield, a Space-Time Block Coding (STBC) subfield, a Doppler subfield, a GI-LTF Size subfield, an EHT-LTF Mode subfield, a Beam Change subfield, and a Preamble Puncturing Bitmap subfield. The User field 508a may have a field size of 22 bits and may include a STA Identifier (ID) field, an EHT MCS field, a DCM field, a Number Of Space-Time Streams (NSTS) And Midamble Periodicity field, a Coding field, and a Beamformed field. The STA ID is included in the User field to allow unintended STAs to discard the remaining EHT Basic PPDU 500 to improve power efficiency.It will be apparent to one of ordinary skill in the art that unless otherwise specified herein, the standard definitions, protocols, and functions of most of the fields in Common Field 1 506a and User Field 508a listed in Table 13 and Table 2 are derived from the 802.11ax specification. [Table 2]

[0059] According to the present disclosure, when an EHT Basic PPDU 500 is transmitted to a single STA and the BW field of the U-SIG field 502 is set to "4," "5," "6," or "7," which respectively indicate a preamble puncturing mode of 80 MHz, 160 (or 80+80) MHz, or 320 (or 160+160) MHz, a Preamble Puncturing Bitmap field is present in the Common field 506 of the EHT-SIG field 504. The Preamble Puncturing Bitmap field has a variable bit width that depends on the bandwidth of the EHT Basic PPDU 500.

[0060] The Preamble Puncturing Bitmap field can have two options. In option 1, when the BW field indicates a preamble puncturing mode of 80 MHz, 160 (or 80 + 80) MHz, or 320 (or 160 + 160) MHz, the Preamble Puncturing Bitmap field has 3 bits, 7 bits, or 15 bits, respectively. Each bit indicates whether a 20 MHz frequency segment other than the primary 20 MHz is punctured. In option 2, when the BW field indicates a preamble puncturing mode of 80 MHz, 160 (or 80 + 80) MHz, or 320 (or 160 + 160) MHz, the Preamble Puncturing Bitmap field has 3 bits, 7 bits, or 7 bits, respectively. In particular, when the BW field indicates an 80 MHz or 160 (or 80 + 80) MHz preamble puncturing mode, each bit indicates whether a 20 MHz frequency segment other than the primary 20 MHz is punctured, and when the BW field indicates a 320 MHz or 160 + 160 MHz preamble puncturing mode, each bit indicates whether a 40 MHz frequency segment other than the primary 40 MHz is punctured. The effect of indicating a 40 MHz frequency segment rather than a 20 MHz frequency segment in a 320 MHz or 160 + 160 MHz preamble puncturing mode is a trade-off between signaling overhead and spectral efficiency. The above features advantageously enable preamble puncturing of PPDUs transmitted to a single STA using the EHT basic PPDU 500.

[0061] Furthermore, the EHT-LTF Mode field in Common Field 1 506a is set to "0" indicating that subcarrier interleaved EHT-LTF symbols are not used, or to "1" indicating that subcarrier interleaved EHT-LTF symbols may be used. Examples of subcarrier interleaved EHT-LTF symbols are described in Non-Patent Document 1. Such subcarrier interleaved EHT-LTF symbols can be used to preserve the number of EHT-LTF symbols, especially when the number of space-time streams is 9 or more.

[0062] According to various embodiments, the format of the EHT-SIG field when the EHT Basic PPDU 500 is transmitted to multiple STAs is different from the format of the EHT-SIG field when transmitted to a single STA. For the EHT Basic PPDU 500 transmitted to multiple STAs, the Common field of the EHT-SIG field 504 includes two elements, Common Field 1 and Common Field 2, and the User Specific field includes one or more User fields, collectively referred to as the EHT-SIG content channel. Furthermore, depending on the bandwidth of the EHT Basic PPDU, there may be one or two EHT-SIG content channels. Specifically, the EHT-SIG field 504, including the Common field 510 and the User Specific field 512, is coded separately for each L×20 MHz frequency segment, where L=1 or 2.

[0063] FIG. 5E is a table illustrating how the number of EHT-SIG content channels depends on the bandwidth and the value of L, according to various embodiments. As shown in FIG. 5E, if the bandwidth is 20 MHz, L can only be 1 because the EHT-SIG field is encoded every 20 MHz and there is only one EHT-SIG content channel. In an embodiment where the bandwidth is 40 MHz, the AP can assign a value of 1 or 2 for L. If L is set to "1," there are two EHT-SIG content channels. If L is set to "2," there is only one EHT-SIG content channel. In embodiments where the bandwidth is 80 MHz, 80+80 MHz, 160 MHz, 160+160 MHz, or 320 MHz, there are two EHT-SIG content channels, regardless of the value of L. Details are provided below.

[0064] Figure 5F shows a diagram of the mapping of one or two EHT-SIG content channels in a 40 MHz EHT Basic PPDU. The number of EHT-SIG content channels depends on the bandwidth and the value of L, as shown in Figure 5E. A 40 MHz channel contains two 20 MHz frequency segments. When L=1, there are two EHT-SIG content channels (i.e., EHT-SIG Content Channel 1 and EHT-SIG Content Channel 2), transmitted in the first and second 20 MHz frequency segments, respectively. When L=2, there is only one EHT-SIG content channel.

[0065] Figure 5G shows a diagram of the mapping of two EHT-SIG content channels (i.e., EHT-SIG content channel 1 and EHT-SIG content channel 2) in an 80 MHz EHT basic PPDU. When L=1, in an 80 MHz channel containing four 20 MHz frequency segments, EHT-SIG content channel 1 is duplicated and transmitted in the first and third 20 MHz frequency segments, and EHT-SIG content channel 2 is duplicated and transmitted in the second and fourth 20 MHz frequency segments. When L=2, in an 80 MHz channel containing two 40 MHz frequency segments, EHT-SIG content channel 1 is duplicated and transmitted in the first 40 MHz frequency segment, and EHT-SIG content channel 2 is duplicated and transmitted in the second 40 MHz frequency segment.

[0066] Figure 5H shows the mapping of two EHT-SIG content channels in an 80+80 MHz or 160 MHz EHT basic PPDU. When L=1, in an 80+80 MHz or 160 MHz channel containing eight 20 MHz frequency segments, EHT-SIG content channel 1 is duplicated and transmitted in the first, third, fifth, and seventh 20 MHz frequency segments, and EHT-SIG content channel 2 is duplicated and transmitted in the second, fourth, sixth, and eighth 20 MHz frequency segments. When L=2, in an 80+80 MHz or 160 MHz channel containing four 40 MHz frequency segments, EHT-SIG content channel 1 is duplicated and transmitted in the first and third 40 MHz frequency segments, and EHT-SIG content channel 2 is duplicated and transmitted in the second and fourth 40 MHz frequency segments.

[0067] Figure 5I shows a diagram of the mapping of two EHT-SIG content channels in a 160+160 MHz or 320 MHz EHT basic PPDU. When L=1, in a 160+160 MHz or 320 MHz channel containing 16 20 MHz frequency segments, EHT-SIG content channel 1 is duplicated and transmitted in the first, third, fifth, seventh, ninth, eleventh, thirteenth, and fifteenth 20 MHz frequency segments, and EHT-SIG content channel 2 is duplicated and transmitted in the second, fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth 20 MHz frequency segments. When L=2, in a 160+160 MHz or 320 MHz channel containing eight 40 MHz frequency segments, EHT-SIG Content Channel 1 is duplicated and transmitted in the first, third, fifth, and seventh 40 MHz frequency segments, and EHT-SIG Content Channel 2 is duplicated and transmitted in the second, fourth, sixth, and eighth 40 MHz frequency segments.

[0068] In various embodiments, for an EHT PPDU transmitted to multiple STAs, the User Specific field may consist of one or more User Block fields, with each User Block field including one or two User fields. For example, as shown in Figures 5J and 5K, the User Specific field 512 includes three User Block fields 1, 2, and 3, where User Block field 1 includes two User fields, such as User field 1 and User field 2, User Block field 2 includes two User fields, such as User field 3 and User field 4, and User Block field 3 includes one User field 5, with a CRC field and tail bits added to one or two User fields for error detection. In one embodiment, the last user block may consist of one or two user fields depending on the total number of user fields allowed in the User Specific field 512, indicating odd or even.

[0069] However, the common fields, including common field 1 and common field 2, can be coded together (option 1) or separately (option 2), resulting in two options for EHT-SIG field format. Figure 5J shows an example format of the EHT-SIG field 504 when common field 1 and common field 2 are coded together (option 1) in an EHT basic PPDU transmitted to multiple STAs. In this embodiment, common field 510 includes common field 1 510a followed by common field 2 510b, to which a block of CRC field and tail bits are appended. An advantage of this EHT-SIG field format with jointly coded common fields is that it reduces the number of CRC fields and tail bits used in the EHT-SIG field, thereby reducing signaling overhead.

[0070] 5K illustrates an example format of the EHT-SIG field 504 when the Common field 510 is separately coded (Option 2) in an EHT Basic PPDU transmitted to multiple STAs. In this embodiment, a CRC field and tail bits may be included at the end of each separately coded field (i.e., Common Field 1 510a and Common Field 2 510b).

[0071] However, in one embodiment, if the EHT-SIG Compression field in the U-SIG field 502 is set to "1" indicating full-band MU-MIMO transmission, the Common field 2 may not be present. In this case, both Option 1 and Option 2 of the format of the EHT basic PPDU transmitted to multiple STAs will be the same.

Table 3

[0072] Example formats for Common Field 1 510a and Common Field 2 510b when the EHT Basic PPDU 500 is transmitted to multiple STAs are shown in Tables 3 and 14, respectively. Common Field 1 510a may include an LDPC Extra Symbol Segment subfield, a Pre-FEC Padding Factor subfield, a PE Disambiguity subfield, a Doppler subfield, a GI-LTF Size subfield, an EHT-LTF Mode subfield, and a Number Of EHT-LTF Symbols And Midamble Periodicity subfield. Common Field 1 has a field size of 12 bits and is the same across all EHT-SIG content channels. Common field 2 510b may include an RU Allocation field and a Center 26-Tone RU field. The RU Allocation subfield of an EHT-SIG content channel corresponding to one or more 20 MHz frequency segments indicates RU allocation, including the size of the RUs and their placement in the frequency domain, and may also indicate a preamble puncturing pattern. The RU Allocation subfield and the Center 26-Tone RU subfield have different field sizes depending on the BW of the EHT basic PPDU. Common field 2 may also differ between EHT-SIG content channels depending on the RU allocation. Note that Common field 2 is not present when the EHT-SIG Compression subfield of the U-SIG field 502 is set to "1."

[0073] Examples of the format of the User field for non-MU MIMO and MU MIMO assignments are shown in Tables 4 and 5, respectively. For non-MU MIMO assignments, the User field may include a STA ID field, an EHT MCS field, a DCM field, an NSTS field, a Coding field, and a Beamformed field, while for MU MIMO assignments, the User field may include a STA ID field, an EHT MCS field, a Spatial Configuration field, and a Coding field. It will be apparent to those of ordinary skill in the art that the standard definitions, protocols, and functions of all fields in Common Field 1, Common Field 2, and the User field listed in Tables 3 to 5 and Table 14 are derived from the 802.11ax specification unless otherwise specified herein. [Table 4] [Table 5]

[0074] Table 15 summarizes different EHT-SIG field formats in an EHT Basic PPDU depending on how the EHT-SIG field is coded, according to various embodiments provided in the present disclosure. When an EHT Basic PPDU is transmitted to a single STA, i.e., when the SU / MU Flag field in the U-SIG field is set to '0', the Common field in the EHT-SIG field includes a single Common field 1, and the User Specific field includes a single User field. The Common field and the User Specific field can be coded separately (i.e., Option 1) or together (i.e., Option 2). On the other hand, when an EHT Basic PPDU is transmitted to multiple STAs, i.e., when the SU / MU Flag field in the U-SIG field is set to '1', the Common field and the User Specific field are coded separately. The Common fields include Common Field 1 and, if the EHT Compression field in the U-SIG field is set to '0', Common Field 2. Common Field 1 and Common Field 2 can be coded together (i.e., Option 1) or separately (i.e., Option 2).

[0075] 6 shows an example of the format of an EHT TB PPDU 600. The EHT TB PPDU 600 has a structure similar to the EHT basic PPDU 500, but does not include the EHT-SIG field 504. The EHT TB PPDU 600 may include an L-STF field, an L-LTF field, an L-SIG field, an FIF field, a U-SIG field 602, an EHT-STF field, an EHT-LTF field, a Data field, and a PE field. The L-STF field, the L-LTF field, the L-SIG field, the RL-SIG field, and the U-SIG field 602 may be grouped as a pre-EHT modulation field, and the EHT-STF field, the EHT-LTF field, the Data field, and the PE field may be grouped as an EHT modulation field. The EHT TB PPDU may be used for trigger-based communication in response to a requesting trigger frame. For example, the EHT TB PPDU can be used by the STAs 404, 406 to transmit BA frames 414, 415 when an EHT basic PPDU 410 is transmitted to the STAs 404, 406 and includes one or more trigger frames, as shown in FIG. 4A.

[0076] Table 6 shows an example format of the U-SIG field 602 of the EHT TB PPDU 600. Similar to the EHT Basic PPDU 500, the U-SIG field 602 includes two parts, U-SIG1 and U-SIG2, each containing 26 data bits. In this embodiment, all version-independent bits can be included in U-SIG1. The first part (i.e., U-SIG1) of the U-SIG field 602 includes a PHY Version Identifier field, a UL / DL Flag field, a BSS Color field, a TXOP Duration field, a PPDU Format field, and a BW field. The PHY Version Identifier field is used to identify the exact PHY version, starting with 802.11be. The second part of the U-SIG field 602 (i.e., U-SIG2) includes Spatial Reuse 1 through 4 fields, followed by a CRC field and tail bits. Information in some of the fields in the U-SIG field 602 (e.g., the BW field and Spatial Reuse 1 through 4 fields) can be copied from the corresponding trigger frame that requests the transmission of the EHT TB PPDU 600. It should be apparent to those of ordinary skill in the art that the standard definitions, protocols, and functions of most of the fields in the U-SIG field 602 of the EHT TB PPDU 600 are derived from the 802.11ax specification. [Table 6]

[0077] 4B shows a flowchart 420 illustrating downlink communications according to another embodiment, where the downlink communications are between an AP 422 and a single communication device 424 or between the AP 422 and multiple communication devices, such as STAs 424 and 426. A contention-based channel access procedure, e.g., an EDCA procedure, is indicated by block 428, and a SIFS 431 is shown. The AP 422 can generate a transmission signal (e.g., an EHT SU PPDU or an EHT MU PPDU) 430 including a first signal field having a first portion, a second portion, and a third portion, each portion including the same number of data bits, where the data bits in the second and third portions of the first signal field do not include version-independent bits. The first portion of the first signal field of the transmission signal 430 can have a single format regardless of whether the transmission signal 430 is sent to the STA 424 or the STAs 424 and 426. The second or third portion of the first signal field of the transmission signal 430 may have a different format depending on whether the transmission signal 430 is transmitted to the STA 424 or the STAs 424, 426. In one embodiment, the transmission signal 430 may include the second signal field when the transmission signal 430 is transmitted to the STAs 424, 426. In this case, the first signal field includes information for interpreting the second signal field. In one embodiment, the first signal field may include a preamble puncturing bitmap when the transmission signal 430 is transmitted to the STA 424. The wireless transmitter of the AP 422 may transmit the generated transmission signal 430 to the STA 424 or the STAs 424, 426.

[0078] After the last symbol of the transmission signal 430 is transmitted, the SIFS 431 is enabled, and at 432, the wireless transmitters of the STAs 424 and 426 can simultaneously transmit their respective BA frames 434 and 435 when the transmission signal 430 is transmitted to the STAs 424 and 426, or the wireless transmitter of the STA 424 can transmit its own BA frame 434 when the transmission signal 430 is transmitted to the STA 424.

[0079] According to the present disclosure, the EHT SU PPDU and EHT MU PPDU can be used for non-triggered communications. In particular, the EHT SU PPDU is used when transmitting to a single STA, and the EHT MU PPDU is used when transmitting to multiple STAs.

[0080] 7A and 7B show example formats of an EHT SU PPDU 700 and an EHT MU PPDU 704, respectively. The EHT MU PPDU 704 has a format similar to the EHT basic PPDU 500 and includes an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field 702, an EHT-SIG field 708, an EHT-STF field, an EHT-LTF field, a data field, and a PE field. Note that the L-STF field, the L-LTF field, the L-SIG field, the RL-SIG field, the U-SIG field 702, and the EHT-SIG field 708 can be grouped as pre-EHT modulation fields, and the EHT-STF field, the EHT-LTF field, the data field, and the PE field can be grouped as EHT modulation fields. On the other hand, the EHT SU PPDU 700 may include a format similar to the EHT basic PPDU 500, but without the EHT-SIG field, which advantageously reduces the signaling overhead of the EHT SU PPDU.

[0081] The U-SIG field 702 includes all version-independent bits, plus all version-dependent bits in the case of an EHT SU PPDU and some of the version-dependent bits in the case of an EHT MU PPDU. According to various embodiments, the U-SIG field 702 has a duration of two OFDM symbols. The data bits of the U-SIG field 702 are jointly coded and modulated, similar to the HE-SIG-A field in 802.11ax. The modulated data bits of the U-SIG field 702 are mapped to 52 data tones in each of the two OFDM symbols, similar to the HE-SIG-A field in 802.11ax.

[0082] In this disclosure, the U-SIG field 702 includes one or two content channels depending on the BW of the EHT SU PPDU 700 or EHT MU PPDU 704. Specifically, the U-SIG field 702 of a 20 MHz EHT SU PPDU or EHT MU PPDU includes one U-SIG content channel, and the U-SIG field 702 of an EHT SU PPDU or EHT MU PPDU with a BW of 40 MHz or greater includes two U-SIG content channels.

[0083] Figure 7C shows a diagram of the mapping of two U-SIG content channels in a 40 MHz EHT SU PPDU or EHT MU PPDU. The 40 MHz channel includes two 20 MHz frequency segments. The two U-SIG content channels (i.e., U-SIG Content Channel 1 and U-SIG Content Channel 2) are transmitted in the first and second 20 MHz frequency segments, respectively. Figure 7D shows a diagram of the mapping of two U-SIG-B content channels in an 80 MHz EHT SU PPDU or EHT MU PPDU. The 80 MHz channel includes four 20 MHz frequency segments. U-SIG Content Channel 1 is duplicated and transmitted in the first and third 20 MHz frequency segments, and U-SIG Content Channel 2 is duplicated and transmitted in the second and fourth 20 MHz frequency segments.

[0084] Figure 7E shows a diagram of the mapping of two U-SIG content channels in an 80+80 MHz or 160 MHz EHT MU PPDU. The 80+80 MHz or 160 MHz channel includes eight 20 MHz frequency segments, with U-SIG content channel 1 replicated and transmitted in the first, third, fifth, and seventh 20 MHz frequency segments, and U-SIG content channel 2 replicated and transmitted in the second, fourth, sixth, and eighth 20 MHz frequency segments. Figure 7F shows a diagram of the mapping of two U-SIG content channels in a 160+160 MHz or 320 MHz EHT MU PPDU. A 160+160 MHz or 320 MHz channel contains 16 20 MHz frequency segments, with U-SIG Content Channel 1 replicated and transmitted in the first, third, fifth, seventh, ninth, eleventh, thirteenth, and fifteenth 20 MHz frequency segments, and U-SIG Content Channel 2 replicated and transmitted in the second, fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth 20 MHz frequency segments. When L=2, a 160+160 MHz or 320 MHz channel contains eight 40 MHz frequency segments, with U-SIG Content Channel 1 replicated and transmitted in the first, third, fifth, and seventh 40 MHz frequency segments, and U-SIG Content Channel 2 replicated and transmitted in the second, fourth, sixth, and eighth 40 MHz frequency segments.

[0085] According to the present disclosure, the U-SIG field 702 includes three portions: U-SIG1 710, U-SIG2 712, and U-SIG3 714, each containing 26 data bits. U-SIG1 710 contains all version-independent bits and a portion of the version-dependent bits, while U-SIG2 712 and U-SIG3 714 contain the remaining version-dependent bits. Figures 7G and 7H show example formats for U-SIG content channel 1 and U-SIG content channel 2, respectively. U-SIG content channel 1 can include U-SIG1 710 and U-SIG2 712, and U-SIG content channel 2 can include U-SIG1 710 and U-SIG3 714. In one embodiment, U-SIG content channel 1 includes the version-dependent bits necessary to interpret a 20 MHz EHT SU PPDU or EHT MU PPDU. The effect of such a configuration, where U-SIG1 710 is included in both U-SIG content channels 1 and 2, is that legacy STAs can decode any U-SIG content channel to obtain version-independent information. [Table 7]

[0086] Table 7 shows an example of the format of U-SIG1 710, the U-SIG field of an EHT SU PPDU or EHT MU PPDU. U-SIG1 710 may include a PHY Version Identifier field, a UL / DL Flag field, a BSS Color field, a TXOP Duration field, a PPDU Format field, a BW field, an LDPC Extra Symbol Segment field, a Pre-FEC Padding Factor field, and a Disambiguity field. When the PHY Version Identifier field indicates 802.11be, the PPDU Format field is set to '0' to indicate an EHT SU PPDU, '1' to indicate an EHT MU PPDU, or '2' to indicate an EHT TB PPDU. Preamble puncturing mode is only allowed if the BW of the PPDU is 80 MHz or greater. Based on this, the BW field is set to "0" for 20 MHz, "1" for 40 MHz, "2" for 80 MHz no-preamble puncturing mode, "3" for 160 MHz and 80+80 MHz no-preamble puncturing mode, "4" for 320 MHz and 160+160 MHz no-preamble puncturing mode, "5" for 80 MHz preamble puncturing mode, "6" for 160 MHz and 80+80 MHz preamble puncturing mode, and "7" for 320 MHz and 160+160 MHz preamble puncturing mode. [Table 8]

[0087] Table 8 shows an example of the format of the U-SIG field U-SIG2 712 when the PPDU Format field points to an EHT MU PPDU. In this example, U-SIG2 can include an EHT-SIG Compression field, an EHT-SIG EHT MCS field, an EHT-SIG DCM field, a Number Of EHT-SIG Symbols Or MU-MIMO Users field, an STBC field, a Doppler field, a GI-LTF Size field, a Number of EHT-LTF Symbols And Midamble Periodicity field, a CRC field, and tail bits. Table 9 shows an example of the format of the U-SIG field U-SIG2 712 when the PPDU Format field points to an EHT SU PPDU. In this example, U-SIG2 may include an EHT MCS field, a DCM field, a Beamformed field, a Beam Change field, an STBC field, a Doppler field, a GI-LTF Size field, an NSTS and Midamble Periodicity field, a CRC field, and tail bits. [Table 9]

[0088] Table 10 shows an example of the format of the U-SIG field U-SIG3 714 when the PPDU Format field indicates an EHT SU PPDU. In this example, U-SIG3 can include an EHT-LTF Mode field, a Spatial Reuse field, an NSTS MSB (Most Significant Bit), a Preamble Puncturing Bitmap field, a CRC field, and tail bits. Due to the fixed bit width of the U-SIG field, the Preamble Puncturing Bitmap field has a fixed bit width of 7 bits. In embodiments where the BW field in U-SIG1 indicates a non-preamble puncturing mode of 20 MHz, 40 MHz, 80 MHz, 160 / 80+80 MHz, or 320 / 160+160 MHz, the Preamble Puncturing Bitmap field is reserved. When the BW field refers to the 80 MHz preamble puncturing mode, each of the first three bits indicates whether a 20 MHz frequency segment other than the primary 20 MHz is punctured, and the remaining four bits are reserved. When the BW field refers to the 160 MHz and 80+80 MHz preamble puncturing modes, each bit indicates whether a 20 MHz frequency segment other than the primary 20 MHz is punctured. When the BW field refers to the 320 MHz and 160+160 MHz preamble puncturing modes, each bit indicates whether a 40 MHz frequency segment other than the primary 40 MHz is punctured. Thus, the above features advantageously enable preamble puncturing of PPDUs transmitted to a single STA using an EHT SU PPDU. [Table 10]

[0089] Table 11 shows an example of the format of the U-SIG field U-SIG3 714 when the PPDU Format field indicates an EHT MU PPDU, i.e., when it is set to "1." In this example, U-SIG3 can include an EHT-LTF Mode field, a Spatial Reuse field, a Number Of EHT-LTF Symbols MSB field, a CRC field, and tail bits. The above U-SIG3 examples for EHT SU PPDU and MU PPDU assume that the 20 MHz EHT PPDU contains a maximum of eight EHT-LTF symbols that are not subcarrier interleaved and that parameterized spatial reuse (PSR)-based spatial reuse operation is not permitted. Therefore, U-SIG3 714 is not required to interpret 20 MHz EHT PPDUs. It will be apparent to those of ordinary skill in the art that the standard definitions, protocols, and functions of all U-SIG fields listed in Tables 10 to 14 are derived from the 802.11ax specification unless otherwise specified herein. [Table 11]

[0090] Returning to FIG. 7B, the EHT MU PPDU 704 includes an EHT-SIG field 708. The EHT-SIG field 708 may contain the remaining version-dependent bits of the EHT MU PPDU 704. Similar to the EHT-SIG field 504, when an EHT basic PPDU is transmitted to multiple STAs, the EHT-SIG field 708 has a variable MCS and length. The EHT-SIG field 708 includes a Common field and a User Specific field, collectively referred to as the EHT-SIG content channel. The Common field and User Specific field are coded separately, and depending on the BW of the EHT MU PPDU 704, there may be one or two EHT-SIG content channels. The Common field 716 may include a Common field 2. The User Specific field includes one or more User fields.

[0091] Figure 7I shows an example of the EHT-SIG content channel of the EHT MU PPDU 704 in more detail. Common field 716 includes Common field 2 716b, a CRC field, and tail bits. Common field 2 716b may have the same format as Common field 2 506b of the EHT basic PPDU 500 shown in Figures 5J-5K and Table 14. Similarly, User Specific field 718 may be composed of one or more User Block fields, with each User Block field containing one or two User fields. For example, the User Specific field 718 may include three User Block fields 1, 2, and 3, where User Block field 1 includes two user fields such as User field 1 and User field 2, User Block field 2 includes two user fields such as User field 3 and User field 4, and User Block field 3 includes one User field 5, with one or two user fields in each of User Block fields 1 through 3 having a CRC field and tail bits added for error detection. In one embodiment, the last user block may consist of one or two user fields depending on the total number of user fields allowed in the User Specific field 718, which may refer to odd or even numbers. The User fields for non-MU-MIMO and MU-MIMO assignments may have the same format as the EHT Basic PPDU 500 shown in Table 4 and Table 5, respectively.

[0092] 8 shows another example format of the EHT TB PPDU 800. The EHT TB PPDU 800 has a structure similar to the EHT SU PPDU 700. The EHT TB PPDU 800 may include an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field 802, an EHT-STF field, an EHT-LTF field, a Data field, and a PE field. The L-STF field, the L-LTF field, the L-SIG field, the RL-SIG field, and the U-SIG field 802 may be grouped as a pre-EHT modulation field, and the EHT-STF field, the EHT-LTF field, the Data field, and the PE field may be grouped as an EHT modulation field. The EHT TB PPDU 800 is used for trigger-based communication in response to a requesting trigger frame. For example, the EHT TB PPDU can be used by the STAs 424, 426 to transmit BA frames 434, 435 when an EHT basic PPDU 430 is transmitted to the STAs 424, 426 and includes one or more trigger frames, as shown in FIG. 4B.

[0093] The U-SIG field 802 of the EHT TB PPDU 800 contains one U-SIG content channel. The U-SIG field 802 contains two parts, U-SIG1 and U-SIG2, each containing 26 data bits. Table 12 shows an example format of the U-SIG field 802 of the EHT TB PPDU 800. The first part of the U-SIG field 802, U-SIG1, can contain all version-independent bits and includes the PHY Version Identifier, UL / DL Flag, BSS Color, TXOP Duration, PPDU Format, and BW fields. The PHY Version Identifier field is used to identify the exact PHY version starting with 802.11be. The second part of the U-SIG field 802, i.e., U-SIG2, includes a Spatial Reuse 1-4 field, followed by a CRC field and tail bits, which are information that depends on the PPDU format. Some of the fields in the U-SIG field 802 (e.g., the BW field and Spatial Reuse 1-4 fields) can be copied from the corresponding trigger frame that requests the transmission of the EHT TB PPDU 800. It should be apparent to those of ordinary skill in the art that the standard definitions, protocols, and functions of most of the fields in the U-SIG field 802 of the EHT TB PPDU 800 are derived from the 802.11ax specification. [Table 12]

[0094] FIG. 9 illustrates a configuration of a communications device 900, e.g., an AP, according to various embodiments. Similar to the schematic example of communications device 300 illustrated in FIG. 3, communications device 900 includes circuitry 902, at least one wireless transmitter 910, at least one wireless receiver 912, and at least one antenna 914 (only one antenna is depicted in FIG. 9 for simplicity). Circuitry 902 may include at least one controller 908 for use in performing tasks designed to communicate control signaling with the assistance of software and hardware. Circuitry 902 may further include a transmit signal generator 904 and a receive signal processor 906. The at least one controller 908 may control the transmit signal generator 904 and the receive signal processor 906. The transmit signal generator 904 may include a frame generator 922, a control signaling generator 924, and a PPDU generator 926. Frame generator 922 may generate MAC frames, e.g., data frames or trigger frames. The control signaling generator 924 may generate a control signaling field of a generated PPDU (e.g., a U-SIG field and an EHT-SIG field of an EHT Basic PPDU or an EHT MU PPDU, or a U-SIG field of an EHT SU PPDU). The PPDU generator 926 may generate a PPDU (e.g., an EHT Basic PPDU, an EHT SU PPDU, or an EHT MU PPDU).

[0095] The receive signal processor 906 may include a data demodulator / decoder 932 capable of demodulating and decoding a data portion of the received signal (e.g., a data field of an EHT Basic PPDU, EHT SU PPDU, or EHT TB PPDU). The receive signal processor 906 may further include a control demodulator / decoder 934 capable of demodulating and decoding a control signaling portion of the received signal (e.g., a U-SIG field of an EHT Basic PPDU, EHT SU PPDU, or EHT TB PPDU, an EHT-SIG field of an EHT Basic PPDU). The at least one controller 908 may include a control signal parser 942 and a scheduler 944. The scheduler 944 may determine RU information and user-specific assignment information for assignment of downlink SU or MU transmissions, as well as trigger information for assignment of uplink MU transmissions. The control signal parser 942 can parse the control signaling portion of the received signal and the trigger information for allocating uplink MU transmissions shared by the scheduler 944, and assist the data demodulator and decoder 932 in demodulating and decoding the data portion of the received signal.

[0096] FIG. 10 illustrates the configuration of a communication device 1000, e.g., a station (STA), according to various embodiments. Similar to the schematic example of the communication device 300 illustrated in FIG. 3, the communication device 1000 includes a circuit 1002, at least one wireless transmitter 1010, at least one wireless receiver 1012, and at least one antenna 1014 (only one antenna is illustrated in FIG. 10 for simplicity). The circuit 1002 may include at least one controller 1008 for use in performing tasks designed to communicate control signaling with the assistance of software and hardware. The circuit 1002 may further include a transmit signal processor 1004 and a receive signal generator 1006. The at least one controller 1008 may control the transmit signal processor 1004 and the receive signal generator 1006. The receive signal processor 1006 may include a data demodulator / decoder 1032 and a control demodulator / decoder 1034. The control demodulator and decoder 1034 can demodulate and decode the control signaling portion of the received signal (e.g., the U-SIG field and EHT-SIG field of the EHT Basic PPDU or EHT MU PPDU, or the U-SIG field of the EHT SU PPDU). The data demodulator and decoder 1032 can demodulate and decode the data portion of the received signal (e.g., the data field of the ETH Basic PPDU, EHT SU PPDU, or EHT MU PPDU) according to the RU information of its own allocation and user-specific allocation information.

[0097] The at least one controller 1008 may include a control signal parser 1042, a scheduler 1044, and a trigger information parser 1046. The control signal parser 1042 may parse a control signaling portion of a received signal (e.g., the U-SIG field and EHT-SIG field of an EHT Basic PPDU or EHT MU PPDU, or the U-SIG field of an EHT SU PPDU) and assist the data demodulator / decoder 1032 in demodulating and decoding a data portion of the received signal (e.g., the data field of an EHT Basic PPDU, EHT SU PPDU, or EHT MU PPDU). The trigger information parser 1048 may parse trigger information for its uplink allocation from a received trigger frame included in the data portion of the received signal. The transmit signal generator 1004 may include a control signaling generator 1024 that may generate a control signaling field of the generated PPDU (e.g., a U-SIG field of an EHT Basic PPDU, an EHT SU PPDU, or an EHT TB PPDU). The transmit signal generator 1004 may further include a PPDU generator 1026 that generates the PPDU (e.g., an EHT Basic PPDU, an EHT SU PPDU, or an EHT TB PPDU). The transmit signal generator 1004 may further include a frame generator 1022 that generates a MAC frame (e.g., a data frame).

[0098] As described above, the embodiments of the present disclosure provide an advanced communication system, communication method, and communication device for control signaling in a very high throughput MIMO WLAN network, and improve the spectral efficiency in the MIMO WLAN network.

[0099] The present disclosure can be implemented by software, hardware, or software cooperating with hardware. Each functional block used in the above-described embodiments can be implemented, in part or in whole, by an LSI such as an integrated circuit. Each process described in each embodiment can be controlled, in part or in whole, by the same LSI or a combination of LSIs. The LSI can be formed as multiple individual chips, or a single chip can be formed to include some or all of the functional blocks. The LSI can include a data input / output unit coupled thereto. Depending on the degree of integration, the LSI can also be referred to as an IC, system LSI, super LSI, or ultra LSI. However, the technology for implementing an integrated circuit is not limited to LSI, and can be implemented using dedicated circuits, general-purpose processors, or dedicated processors. Furthermore, FPGAs (Field Programmable Gate Arrays), which can be programmed after LSI fabrication, and reconfigurable processors, which can reconfigure the connections and settings of circuit cells arranged within the LSI, can also be used. The present disclosure can be implemented using digital or analog processing. If future integrated circuit technologies replace LSI as a result of advances in semiconductor technology or other derivative technologies, the future integrated circuit technologies can be used to integrate functional blocks. Biotechnology can also be applied.

[0100] The present disclosure may be implemented by any type of apparatus, device, or system having communication capabilities, referred to as a communications apparatus.

[0101] A communication device can include a transceiver and processing / control circuitry. The transceiver can include and / or function as a receiver and a transmitter. The transceiver (as a transmitter and receiver) can include an RF (radio frequency) module that includes an amplifier, an RF modulator / demodulator, and one or more antennas.

[0102] Some non-limiting examples of such communications devices include telephones (e.g., mobile phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices), game consoles, e-readers, telehealth / telemedicine devices, vehicles (e.g., automobiles, airplanes, ships) that provide communications capabilities, and various combinations thereof.

[0103] Communication devices are not limited to portable or mobile devices, but can also include any type of equipment, device, or system that is non-portable or stationary, such as smart home devices (e.g., appliances, lights, smart meters, control panels), vending machines, and any other "thing" in an "Internet of Things" (IoT) network.

[0104] Communications can include exchanging data, for example, through cellular systems, wireless LAN systems, satellite systems, and various combinations thereof.

[0105] A communications device may include devices such as a controller or a sensor coupled to the communications device to perform the communications functions described in this disclosure. For example, a communications device may include a controller or a sensor that generates control or data signals used by the communications device to perform the communications functions of the communications device.

[0106] The communications apparatus may further include infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicate with or control apparatuses such as the apparatuses in the non-limiting examples above.

[0107] Although some features of various embodiments are described with reference to devices, corresponding features also apply to the methods of various embodiments, and vice versa.

[0108] Those skilled in the art will appreciate that numerous changes and / or modifications may be made to the present disclosure as set forth in the specific embodiments without departing from the spirit or scope of the disclosure as broadly described, and the present embodiments are therefore to be considered in all respects as illustrative and not restrictive. [Table 13] [Table 14] [Table 15]

Claims

1. A communication device, a receiver for receiving an Extremely High Throughput Physical layer Protocol Data Unit (EHT PPDU) including a Universal Signal (U-SIG) field having a first portion (U-SIG1) and a second portion (U-SIG2), each containing the same number of data bits, wherein the data bits of the U-SIG2 do not include a version-independent bit; a circuit for processing the received EHT PPDU; Equipped with the EHT PPDU further comprises an EHT Signaling (EHT-SIG) field including common and user-specific fields, together referred to as an EHT-SIG Content Channel; Both the U-SIG field and the EHT-SIG field are present in the EHT PPDU transmitted to a single STA or multiple STAs; When the EHT PPDU is transmitted to the single STA, the user-specific field has a single user field, the EHT PPDU includes a single EHT content channel regardless of the bandwidth of the EHT PPDU, and the single EHT content channel is replicated for each 20 MHz frequency segment; Communication equipment.

2. In non-triggered communications with one or more other STAs, the U-SIG field has a single format. The communication device according to claim 1 .

3. In non-trigger-based communication, the EHT-SIG field includes a portion of version-dependent bits; The communication device according to claim 1 .

4. When the EHT PPDU is transmitted to the multiple STAs, the common field includes a common field 1 and a common field 2 that are encoded separately in the EHT content channel; The communication device according to claim 1 .

5. When the EHT PPDU is transmitted to the single STA, the EHT-SIG field includes a preamble puncturing bitmap; The communication device according to claim 3 .

6. The preamble puncturing bitmap has a variable bit width according to the bandwidth of the EHT PPDU; The communication device according to claim 5 .

7. the U-SIG field contains information for interpreting the EHT-SIG field; The communication device according to claim 3 .

8. A communication method for a communication device, comprising: receiving an Extremely High Throughput Physical layer Protocol Data Unit (EHT PPDU) including a Universal Signal (U-SIG) field having a first portion (U-SIG1) and a second portion (U-SIG2), each containing the same number of data bits, wherein the data bits of the U-SIG2 do not include a version-independent bit; processing the received EHT PPDU; Including, the EHT PPDU further comprises an EHT Signaling (EHT-SIG) field including common and user-specific fields, together referred to as an EHT-SIG Content Channel; Both the U-SIG field and the EHT-SIG field are present in the EHT PPDU transmitted to a single STA or multiple STAs; When the EHT PPDU is transmitted to the single STA, the user-specific field has a single user field, the EHT PPDU includes a single EHT content channel regardless of the bandwidth of the EHT PPDU, and the single EHT content channel is replicated for each 20 MHz frequency segment; Communication method.

9. receiving an Extremely High Throughput Physical layer Protocol Data Unit (EHT PPDU) including a Universal Signal (U-SIG) field having a first portion (U-SIG1) and a second portion (U-SIG2), each containing the same number of data bits, wherein the data bits of the U-SIG2 do not include a version-independent bit; a process for processing the EHT PPDU; Including, the EHT PPDU further comprises an EHT Signaling (EHT-SIG) field including common and user-specific fields, together referred to as an EHT-SIG Content Channel; Both the U-SIG field and the EHT-SIG field are present in the EHT PPDU transmitted to a single STA or multiple STAs; When the EHT PPDU is transmitted to the single STA, the user-specific field has a single user field, the EHT PPDU includes a single EHT content channel regardless of the bandwidth of the EHT PPDU, and the single EHT content channel is replicated for each 20 MHz frequency segment; Integrated circuit.

Images