JP6968240B2 - Data transmission method and equipment - Google Patents

Description

The present invention relates to the field of network communication technology, and more particularly to data transmission methods, devices, and systems, and access points.

With the development of the mobile Internet and the spread of intelligent terminals, data traffic is increasing rapidly. The advantages of high speed and low cost make wireless local area networks one of the mainstream mobile broadband access technologies. In existing Wi-Fi systems, such as traditional systems based on IEEE 802.11a, high throughput systems based on IEEE 802.11n, or very high throughput systems based on IEEE 802.11ac, uplink data transmission is always point-to-point. Transmission, that is, on the same channel or in the same spectrum, only one station sends and receives data to and from the access point at the same time. Similarly, downlink data transmission is also point-to-point transmission, i.e., the access point sends and receives data to and from only one station at the same time on the same channel or in the same spectrum.
Next-generation Wi-Fi (Wireless Fidelity) systems, such as HEW (High Efficiency WLAN) systems, impose higher requirements on the service transmission speed of wireless local area systems. However, limited by a single channel or a single frequency band, existing point-to-point transmission schemes cannot meet high speed service transmission requirements.

International Publication No. 2015/06636 International Publication No. 2013/170136

Yongho Seok, Beamformed HE PPDU, IEEE 802.11-15 / 0597r0, Internet <URL: https://mentor.ieee.org/802.11/dcn/15/11-15-0597-00-00ax-beamformed-he-ppdu. pptx>, May 10, 2015 Young Hoon Kwon, SIG Structure for UL PPDU, IEEE 802.11-15 / 0574r0, Internet <URL: https://mentor.ieee.org/802.11/dcn/15/11-15-0574-00-00ax-sig-structure -for-ul-ppdu.pptx>, May 11, 2015

Thereby, the present invention provides a data transmission method, an apparatus, and a system, and an access point, in which different channel resources are allocated to different stations at the same time, that is, multiple stations can access the channel at the same time. To improve the service transmission speed.
The solution of the present invention is as follows:

A first aspect of an embodiment of the invention provides a method of transmitting data, wherein the size of the frequency resource required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP) is determined. The step of assigning the corresponding frequency resource unit (RU) to send and receive the data portion of the uplink OFDM PPDU and the step of determining one or more basic channel units in which the assigned frequency resource unit (RU) is located. And on the assigned frequency resource unit (RU), send and receive the data portion of the uplink OFDM PPDU, and on one or more determined basic channels, at least some of the common signaling portion of the uplink OFDM PPDU. Includes steps to send and receive fields in.

In the embodiment of the first embodiment of the present invention, the steps for transmitting and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU on the determined basic channels are determined for each basic channel. Includes the step of repeatedly sending and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU on the multiple basic channels by using the multiple basic channels.

In the third embodiment of the first embodiment of the present invention, the data portion of the uplink OFDM PPDU includes uplink user data and / or uplink user MAC control signaling.

In the fourth embodiment of the first embodiment of the present invention, at least some fields in the common signaling portion transmitted and received on one or more basic channels are the Legacy preamble and HE-. Includes SIG-A, or Legacy preamble, HE-SIG-A and HE-SIG-B.

In the fifth embodiment of the first embodiment of the present invention, if at least some fields in the common signaling portion of the uplink OFDMA PPDU frame include only a Legacy preamble, the uplink OFDMA PPDU. The data portion of the frame contains only the ACK signaling, or the data portion of the uplink OFDMA PPDU frame contains the uplink user data and the uplink user ACK signaling, where the ACK signaling belongs to the MAC signaling and , ACK signaling further comprises being placed within a frequency resource based on each basic channel unit.

A second aspect of an embodiment of the invention provides a data transmission device, which determines the size of the frequency resource required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP). One or more basics in which an allocation unit configured to allocate the corresponding frequency resource unit (RU) for sending and receiving the data portion of the uplink OFDM PPDU and the allocated frequency resource unit (RU) are located. On one or more of the determined basic channels, the data portion of the uplink OFDM PPDU is sent and received on the decision unit configured to determine the channel unit and the assigned frequency resource unit (RU). Includes a transmit unit configured to send and receive at least some fields in the common signaling portion of the uplink OFDM PPDU.

In the second embodiment of the second embodiment of the present invention, the transmitting unit uses a plurality of basic channels determined for each basic channel, whereby the uplink OFDM PPDU is used on the plurality of basic channels. Includes a first transmit unit configured to repeatedly send and receive at least some fields in the common signaling portion of.

A third aspect of an embodiment of the invention provides an access point that includes any of the data transmitters described above.

A fourth aspect of an embodiment of the invention provides a data transmission system, wherein the system is a memory with a storage medium, where the memory is used to send and receive data in an uplink OFDMA PPDU. A memory that stores a data transmission program and a processor that is connected to the memory by using a bus, where the processor stores in memory when data transmission is performed in the uplink OFDMA PPDU. The data transmission method program is called, and the data transmission program according to any data transmission method provided in the first aspect is executed.

From the above-mentioned technical solutions, in the embodiment of the present application, the OFDMA (Orthogonal Frequency Division Multiple Access) technology is an IEEE (Institute of Electrical and Electronics Engineers) 802.11ax standard. It can be seen that it is introduced based on. The data in the data portion of the uplink OFDM PPDU scheduled by the access point (AP) is sent and received on the corresponding assigned frequency resource unit (RU) and the assigned frequency resource unit (RU) is placed1 One or more basic channel units are determined, and at least some fields in the common signaling portion of the uplink OFDM PPDU are transmitted and received on the determined basic channel. In this way, one or more basic channels for sending and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU are deterministic. When another user in traditional 802.11a / b / n / ac and 802.11ax BSS performs detection according to traditional CCA, the user sends and receives at least some fields in the common signaling part of the uplink OFDM PPDU. It detects that one or more basic channels for is busy and allows the user to send and receive data on another idle basic channel, thereby improving channel utilization. In addition, multiple users can send and receive data simultaneously on multiple basic channels, thereby improving service transmission speed.

In order to more clearly explain the technical solutions in the embodiments of the present invention or in the prior art, the accompanying drawings required to illustrate the embodiments or the prior art will be briefly described below. Obviously, the accompanying drawings in the following description show only some embodiments of the present invention, one of ordinary skill in the art can further derive other drawings from these attached drawings without any creative effort.

FIG. 1 is a flowchart of the first embodiment of the data transmission method in the present application. FIG. 2a is a brief schematic representation of the channel resource used when an uplink OFDM PPDU frame is transmitted, as described in Embodiment 1 of the present application. FIG. 2b is a brief schematic representation of the channel resource used when another uplink OFDM PPDU frame is transmitted, as described in Embodiment 1 of the present application. FIG. 3a is a brief schematic representation of the channel resource used when yet another uplink OFDM PPDU frame described in Embodiment 1 of the present application is transmitted. FIG. 3b is a brief schematic representation of the channel resource described in Embodiment 1 of the present application and used when another uplink OFDM PPDU frame is transmitted. FIG. 4 is a brief schematic representation of the channel resource described in Embodiment 1 of the present application and used when yet another uplink OFDM PPDU frame is transmitted. FIG. 5 is a flowchart of the second embodiment of the data transmission method in the present application. FIG. 6 is a block diagram of the third embodiment of the data transmission device in the present application. FIG. 7 is a block diagram of the fourth embodiment of the data transmission device in the present application. FIG. 8 is a block diagram of the data transmission system in the present application.

In order to solve the problem of how to improve the service transmission speed, the inventor in the research process, OFDMA (Orthogonal Frequency Division Multiple Access) technology is an IEEE (Institute of Electrical and Electronics Engineers). Engineers, Institute of Electrical and Electronics Engineers) Discovered that it will be introduced based on the 802.11ax standard. According to OFDMA technology, an air interface radio channel time-frequency resource is divided into multiple RBs (Resource Blocks), which can be shared simultaneously and orthogonal in the frequency domain. After the introduction of OFDMA technology, uplink data transmissions are multipoint-to-point transmissions rather than point-to-point transmissions. That is, multiple stations simultaneously transmit data to the access point on the same channel or in the same spectrum. In addition, the downlink data transmission is a point-to-multipoint transmission rather than a point-to-point transmission. Based on this, the inventor considers several multipoint-to-point transmission schemes, such as the first and second schemes.

In the first method:

The data portion of the uplink OFDM PPDU is transmitted and received over a pre-allocated frequency resource unit (RU), and the common signaling portion of the uplink OFDM PPDU is replicated across each basic channel in the channel bandwidth. The frequency resource unit (RU) is smaller than the basic channel unit.

In the second method:

Both the data portion and the common signaling portion of the uplink OFDM PPDU are transmitted and received on the pre-allocated frequency resource unit (RU). The frequency resource unit (RU) is smaller than the basic channel unit.

However, after further study of these possible transmission methods, the inventor discovers that these transmission methods have various problems.

For example, in the first transmission method, if another user in the traditional 802.11a / b / n / ac and 802.11ax BSS performs the discovery according to the traditional CCA, the common signaling part of the uplink OFDM PPDU is the channel. It is detected that the energy on each basic channel in the channel bandwidth is higher than a particular CCA standard because it is replicated across each basic channel in the bandwidth. That is, it is detected that each basic channel is busy. However, in practice, the common signaling portion of the uplink OFDM PPDU is transmitted and received simultaneously on only one basic channel. The transmission scheme described above prevents another user in the BSS from competing for the idle base channel for the data portion, which does not help improve frequency spectrum utilization. In addition, the energy of the uplink user data portion is concentrated in the RU allocated when the data is transmitted, while the front common signaling portion is transmitted and received over multiple basic channels. As a result, the power to receive the front common signaling part and the power to receive the back data part do not match at the receiving end.

The second transmission method is the content of the common signaling part transmitted by the uplink user when another user in the traditional 802.11a / b / n / ac and 802.11ax BSS detects the common signaling part in the traditional method. Is the same, but each scheduled uplink user is pre-assigned and performs transmissions only on RUs that are smaller than the base channel unit, so the common signaling portion that is ultimately sent to and received from the receiving end is It can be incomplete and the frequency resource unit (RU) accommodates a limited resource size.

Therefore, in order to solve the above-mentioned problems, the embodiment of the present invention provides a multipoint two-point transmission method. In the transmission method, the data portion of the uplink OFDMA (orthogonal frequency-division multiplex access) PPDU (a physical layer convergence protocol data unit) scheduled by the access point (AP). Data is sent and received on the corresponding assigned frequency resource unit (RU) to determine one or more basic channel units in which the assigned frequency resource unit (RU) is located and of the uplink OFDM PPDU. At least some fields in the common signaling part are sent and received on one or more determined basic channels. In this way, one or more basic channels for sending and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU are deterministic. When another user in traditional 802.11a / b / n / ac and 802.11ax BSS performs detection according to traditional CCA, the user sends and receives at least some fields in the common signaling part of the uplink OFDM PPDU. It detects that one or more basic channels for is busy and allows the user to send and receive data on another idle basic channel, thereby improving channel utilization. In addition, multiple users can send and receive data simultaneously on multiple basic channels, thereby improving service transmission speed.

In addition, at least some fields in the common signaling portion of the uplink OFDM PPDU are transmitted and received on one or more basic channels, and the basic channels have a relatively large capacity, so that one or more. The basic channel can accommodate at least some fields in the common signaling portion of the uplink OFDM PPDU. Thus, the complete common signaling portion is ultimately transmitted and received to the receiving end via one or more basic channels, and the transmit signaling is not lost in the transmit process.

Hereinafter, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only a part and not all of the embodiments of the present invention. All other embodiments obtained by one of ordinary skill in the art based on embodiments of the invention without creative effort should be included in the scope of protection of the invention.

The specific process will be described in detail in the aforementioned embodiments disclosed in the present invention.

Embodiment 1

FIG. 1 is a flowchart of a data transmission method according to the first embodiment of the present application. The method applies to uplink OFDM PPDUs that correspond to downlink OFDM PPDUs. As shown in Figure 1, the method may include the following steps:

S101: Determines the size of the frequency resource required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP).

S102: Assign the corresponding frequency resource unit (RU).

The data portion of the uplink OFDM PPDU contains uplink user data and / or uplink user MAC control signaling.

S103: Determines one or more basic channel units in which the assigned frequency resource unit (RU) is located.

The basic channel unit is preferably a 20 MHz channel. Certainly, the basic channel unit in the present embodiment of the present invention is not limited to the 20 MHz channel, and any suitable channel can be used as the basic channel unit in the present embodiment of the present invention.

S104: Sends and receives the data portion of the uplink OFDM PPDU on the assigned frequency resource unit (RU) and at least some of the common signaling portion of the uplink OFDM PPDU on one or more determined basic channels. Send and receive fields.

The fields in the common signaling part of the uplink OFDM PPDU include at least the Legacy preamble and are either HE-SIG-A (High Efficient signal part A) or HE-SIG-B (High Efficient signal). Part B, high efficiency signal part B) may be further included. HE-SIG-A is the common resource directive signaling in the uplink OFDM PPDU, and HE-SIG-B is the resource directive signaling for the user in the uplink OFDM PPDU. Depending on the physical layer frame format of the transmit frame, it may be known that the Legacy preamble includes Legacy Short Training Sequence Fields, Legacy Long Training Sequence Fields and Legacy Signaling Fields. HE-SIG-A includes common signaling for setting bandwidth, intersymbol guard intervals, HE-SIG-B length, modulation coding, etc. HE-SIG-B is used to show information about resources etc. allocated to the target user.

Optionally, at least some fields in the common signaling part of the uplink OFDM PPDU frame contain only the Legacy preamble and HE-SIG-A, or the common signaling part of the uplink OFDM PPDU frame is legacy. Includes Legacy preamble, HE-SIG-A and HE-SIG-B.

At least some fields in the common signaling part of the uplink OFDM PPDU frame contain only the Legacy preamble and HE-SIG-A, and the assigned frequency resource unit (RU) is the only basic channel unit. 2a is a brief schematic representation of the channel resource used when the uplink OFDM PPDU frame is transmitted, as described in Embodiment 1 of the present invention.

Alternatively, at least some fields in the common signaling part of the uplink OFDM PPDU frame include the Legacy preamble, HE-SIG-A and HE-SIG-B, and the assigned frequency resource unit (RU). 2b is a brief schematic representation of the channel resources used when another uplink OFDM PPDU frame is transmitted, as described in Embodiment 1 of the invention, when placed in only one basic channel unit. Is.

Uplink user data or uplink user MAC control signaling is transmitted on the assigned RU for the transmission of uplink data or uplink MAC control signaling by using the uplink OFDMA scheduled by the AP. , RU are located on the 20 MHz channel. Legacy preamble and HE-SIG-A; or Legacy preamble, HE-SIG-A and HE-SIG- in the common signaling portion of the uplink OFDM PPDU frame in Embodiment 1 of the present invention. B is transmitted on the 20 MHz channel containing the RU, and the common signaling portion of the uplink OFDM PPDU frame is not transmitted on any other channel in the bandwidth.

At least some fields in the common signaling part of the uplink OFDM PPDU frame contain only the Legacy preamble and HE-SIG-A, and the assigned frequency resource unit (RU) is in multiple basic channel units. When deployed, as shown in FIG. 3a, FIG. 3a is a brief overview of the channel resources used when yet another uplink OFDM PPDU frame described in Embodiment 1 of the invention is transmitted. It is a figure.

Alternatively, at least some fields in the common signaling part of the uplink OFDM PPDU frame include the Legacy preamble, HE-SIG-A and HE-SIG-B, and the assigned frequency resource unit (RU). When placed in multiple basic channel units, FIG. 3b is used when another uplink OFDM PPDU frame described in Embodiment 1 of the invention is transmitted, as shown in FIG. 3b. It is a simple schematic diagram of the channel resource.

Uplink user data or uplink user MAC control signaling is transmitted on the assigned RU for the transmission of uplink data or uplink MAC control signaling by using the uplink OFDMA scheduled by the AP. , RUs are located within multiple 20 MHz channels. In the common signaling part of the uplink OFDM PPDU frame, the Legacy preamble and HE-SIG-A, or the Legacy preamble, HE-SIG-A and HE-SIG-B are arranged with RU. It is transmitted on multiple 20 MHz channels and replicated over each 20 MHz channel. Legacy preambles and HE-SIG-A are not transmitted on any other channel in the bandwidth.

Optionally, if at least some fields in the common signaling part of the uplink OFDM PPDU frame contain only the Legacy preamble, then the data part of the uplink OFDMA PPDU frame contains only the ACK signaling or uplink. The data portion of the OFDMA PPDU frame contains uplink user data and uplink user ACK signaling. ACK signaling belongs to MAC signaling, and ACK signaling is placed on frequency resources based on one or more basic channels. As shown in FIG. 4, FIG. 4 is a brief schematic representation of the channel resource used when another uplink OFDM PPDU frame is transmitted, as described in Embodiment 1 of the present application.

For downlink OFDM PPDUs, the uplink user ACK signaling uses the same symbol length as the legacy preamble and there is no HE-SIG-A or HE-STF / LTF between the legacy preamble and ACK. If the frequency resource unit (RU) is located in only one basic channel unit and RU is assigned for each user's ACK every 20 MHz, both the legacy preamble and ACK signaling in the uplink OFDM PPDU frame are assigned. It is transmitted on the 20 MHz channel. When the frequency resource unit (RU) is located in multiple basic channel units, the Legacy preamble and ACK signaling are replicated across the multiple 20 MHz channels in which the RU is located, and the Legacy preamble and ACK signaling is not transmitted on any other channel in the bandwidth. For example, for user # 3, if the assigned RUs are placed on multiple 20 MHz channels, the Legacy preamble and ACK signaling will be on the third and fourth 20 where the corresponding downlink resources will be placed. Replicated over MHz channels.

In this embodiment of the invention, the data portion of the uplink OFDM PPDU scheduled by the access point (AP) is transmitted and received on the assigned frequency resource unit (RU) and is at least in the common signaling portion of the uplink OFDM PPDU. Some fields are transmitted and received on one or more basic channels where frequency resource units (RUs) are located, for example, at least some fields are on one or more determined 20 MHz channels. Send and receive. In this way, one or more 20 MHz channels for sending and receiving the common signaling portion of the uplink OFDM PPDU are already deterministic, so another in the traditional 802.11a / b / n / ac and 802.11ax BSS. If the user performs the discovery according to the traditional CCA, one or more 20 MHz channels are excluded and the user performs the discovery on the other idle 20 MHz channel for the data portion. In this transmission scheme, another user in the BSS competes for an idle 20 MHz channel for the data portion, and another user in the BSS sends and receives data on the idle base channel for the data portion. It can, thereby improving channel utilization. In addition, multiple users can send and receive data simultaneously on multiple basic channels, thereby improving service transmission speed.

In addition, at least some fields in the common signaling part of the uplink OFDM PPDU are transmitted and received via one or more basic channels, and the basic channels have a relatively large capacity, where the basics are. Since the channel is preferably 20 MHz, one or more basic channels can accommodate at least some fields in the common signaling portion of the uplink OFDM PPDU. Thus, the complete common signaling portion is ultimately transmitted and received to the receiving end via one or more basic channels, and the transmit signaling is not lost in the transmit process.

According to the technical solutions provided in this embodiment of the invention, the data portion of the uplink OFDM PPDU scheduled by the access point (AP) is transmitted and received on the corresponding assigned frequency resource unit (RU). The assigned frequency resource unit (RU) is located in one or more basic channel units, and at least some of the fields in the common signaling part of the uplink OFDM PPDU are determined in one or more. It is sent and received on the basic channel. In this way, one or more basic channels for sending and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU are deterministic. When another user in traditional 802.11a / b / n / ac and 802.11ax BSS performs detection according to traditional CCA, the user sends and receives at least some fields in the common signaling part of the uplink OFDM PPDU. It detects that one or more basic channels for is busy and allows the user to send and receive data in other idle basic channels, thereby improving channel utilization. In addition, multiple users can send and receive data simultaneously on multiple basic channels, thereby improving service transmission speed.

Embodiment 2

Embodiment 2 of the present invention further discloses another data transmission method. As shown in Figure 5, the method comprises the following steps:

S201: Determines the size of the frequency resource required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP).

S202: Assign the corresponding frequency resource unit (RU).

The data portion of the uplink OFDM PPDU contains uplink user data and / or uplink user MAC control signaling.

S203: Determines the multiple basic channel units where the assigned frequency resource units (RUs) will be located.

The basic channel unit is preferably a 20 MHz channel. Certainly, the basic channel unit in the present embodiment of the present invention is not limited to the 20 MHz channel, and any suitable channel can be used as the basic channel unit in the present embodiment of the present invention.

S204: Sends and receives the data portion of the uplink OFDM PPDU on the assigned frequency resource unit (RU) and at least in the common signaling portion of the uplink OFDM PPDU via multiple fundamental channels determined for each fundamental channel. Duplicated some fields.

According to the technical solutions provided in this embodiment of the invention, the data in the data portion of the uplink OFDM PPDU scheduled by the access point (AP) is on the corresponding assigned frequency resource unit (RU). Multiple basic channel units to be sent and received and where the assigned frequency resource unit (RU) is located are determined, and at least some fields in the common signaling part of the uplink OFDM PPDU are through the determined basic channels. Is sent and received. In this way, the plurality of basic channels for sending and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU are deterministic. When another user in traditional 802.11a / b / n / ac and 802.11ax BSS performs detection according to traditional CCA, the user sends and receives at least some fields in the common signaling part of the uplink OFDM PPDU. Multiple basic channels for this are detected to be busy and the user can send and receive data on other idle basic channels, thereby improving channel utilization. In addition, multiple users can send and receive data simultaneously on multiple basic channels, thereby improving service transmission speed.

Embodiment 3

Embodiment 3 of the present invention describes the data transmission device in detail. Referring to FIG. 6, the data transmission device according to this embodiment includes an allocation unit 301, a determination unit 302, and a transmission unit 303.

Allocation unit 301 determines the size of the frequency resource required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP) and the corresponding frequency resource for sending and receiving the data portion of the uplink OFDM PPDU. It is configured to assign a unit (RU).

The data portion of the uplink OFDM PPDU contains uplink user data and / or uplink user MAC control signaling.

The determination unit 302 is configured to determine one or more basic channel units in which the assigned frequency resource unit (RU) is located.

The basic channel unit is preferably a 20 MHz channel. Certainly, the basic channel unit in the present embodiment of the present invention is not limited to the 20 MHz channel, and any suitable channel can be used as the basic channel unit in the present embodiment of the present invention.

The transmit unit 303 sends and receives the data portion of the uplink OFDM PPDU on the assigned frequency resource unit (RU) and on one or more determined basic channels in the common signaling portion of the uplink OFDM PPDU. It is configured to send and receive at least some fields.

The fields in the common signaling part of the uplink OFDM PPDU include at least the Legacy preamble and are either HE-SIG-A (High Efficient signal part A) or HE-SIG-B (High Efficient signal). Part B, high efficiency signal part B) may be further included. HE-SIG-A is the common resource directive signaling in the uplink OFDM PPDU, and HE-SIG-B is the resource directive signaling for the user in the uplink OFDM PPDU. Depending on the physical layer frame format of the transmit frame, it may be known that the Legacy preamble includes Legacy Short Training Sequence Fields, Legacy Long Training Sequence Fields and Legacy Signaling Fields. HE-SIG-A includes common signaling for setting bandwidth, intersymbol guard intervals, HE-SIG-B length, modulation coding, etc. HE-SIG-B is used to show information about resources etc. allocated to the target user.

Optionally, at least some fields in the common signaling part of the uplink OFDM PPDU frame contain only the Legacy preamble and HE-SIG-A, or the common signaling part of the uplink OFDM PPDU frame is legacy. Includes Legacy preamble, HE-SIG-A and HE-SIG-B.

Uplink user data or uplink user MAC control signaling is transmitted on the assigned RU for the transmission of uplink data or uplink MAC control signaling scheduled by the AP by using uplink OFDMA. , RUs are located on only one 20 MHz channel. In Embodiment 3 of the invention, the Legacy preamble and HE-SIG-A; or the Legacy preamble, HE-SIG-A and HE-SIG in the common signaling portion of the uplink OFDM PPDU frame. -B is transmitted on the 20 MHz channel containing the RU, and the common signaling portion of the uplink OFDM PPDU frame is not transmitted on any other channel in the bandwidth.

Uplink user data or uplink user MAC control signaling is transmitted on the assigned RU for the transmission of uplink data or uplink MAC control signaling scheduled by the AP by using uplink OFDMA. , RUs are located within multiple 20 MHz channels. Legacy preamble and HE-SIG-A in the common signaling part of the uplink OFDM PPDU frame; or Legacy preamble, HE-SIG-A and HE-SIG-B are RUs placed. It is transmitted on multiple 20 MHz channels and replicated over each 20 MHz channel. Legacy preambles and HE-SIG-A are not transmitted on any other channel in the bandwidth.

Optionally, if at least some fields in the common signaling part of the uplink OFDM PPDU frame contain only the Legacy preamble, then the data part of the uplink OFDMA PPDU frame contains only the ACK signaling or uplink. The data portion of the OFDMA PPDU frame contains uplink user data and uplink user ACK signaling. The ACK signaling belongs to the MAC signaling, and the ACK signaling is allocated to the frequency resource based on each basic channel unit.

For downlink OFDM PPDUs, the uplink user ACK signaling uses the same symbol length as the legacy preamble and there is no HE-SIG-A or HE-STF / LTF between the legacy preamble and ACK. If the frequency resource unit (RU) is located in only one basic channel unit and RU is assigned for each user's ACK every 20 MHz, both the legacy preamble and ACK signaling in the uplink OFDM PPDU frame are assigned. It is transmitted on the 20 MHz channel. When the frequency resource unit (RU) is located on multiple basic channel units, the Legacy preamble and ACK signaling are replicated across multiple 20 MHz channels, and the Legacy preamble and ACK signaling are bandwidth. Not transmitted on any other channel in width. For example, for user # 3, if the assigned RUs are placed on multiple 20 MHz channels, the Legacy preamble and ACK signaling will be on the third and fourth 20 where the corresponding downlink resources will be placed. Replicated over MHz channels.

In this embodiment of the invention, the data portion of the uplink OFDM PPDU scheduled by the access point (AP) is transmitted and received on the frequency resource unit (RU) allocated by the allocation unit 301 and is common to the uplink OFDM PPDUs. At least some fields in the signaling part are placed on a frequency resource unit (RU) and are transmitted and received on one or more basic channels determined by the decision unit 302, for example, at least some fields are one. Or transmitted and received on multiple determined 20 MHz channels. In this way, one or more 20 MHz channels for sending and receiving the common signaling portion of the uplink OFDM PPDU are already deterministic, so another in the traditional 802.11a / b / n / ac and 802.11ax BSS. If the user performs the discovery according to the traditional CCA, one or more 20 MHz channels are excluded and the user performs the discovery on another idle 20 MHz channel for the data portion. In this transmission scheme, another user in the BSS competes for an idle 20 MHz channel for the data portion, and another user in the BSS sends and receives data on the idle base channel for the data portion. It can, thereby improving channel utilization. In addition, multiple users can send and receive data simultaneously on multiple basic channels, thereby improving service transmission speed.

In addition, at least some fields in the common signaling portion of the uplink OFDM PPDU are transmitted and received by transmit unit 303 on one or more basic channels, and the basic channels are preferably relatively large at 20 MHz. Due to its capacity, one or more basic channels can accommodate at least some fields in the common signaling portion of the uplink OFDM PPDU. Thus, the complete common signaling portion is ultimately transmitted and received to the receiving end via one or more basic channels, and the transmit signaling is not lost in the transmit process.

According to the technical solutions provided in this embodiment of the invention, the data in the data portion of the uplink OFDM PPDU scheduled by the access point (AP) is the frequency resource unit (RU) allocated by the allocation unit 301. One or more basic channel units transmitted and received on and where the assigned frequency resource unit (RU) is located are determined by the decision unit 302 and at least some fields in the common signaling part of the uplink OFDM PPDU are , Transmitted and received on one or more determined basic channels by transmit unit 303. In this way, one or more basic channels for sending and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU are deterministic. When another user in traditional 802.11a / b / n / ac and 802.11ax BSS performs detection according to traditional CCA, the user sends and receives at least some fields in the common signaling part of the uplink OFDM PPDU. It detects that one or more basic channels for is busy and allows the user to send and receive data on another idle basic channel, thereby improving channel utilization. In addition, multiple users can send and receive data simultaneously on multiple basic channels, thereby improving service transmission speed.

Embodiment 4

Embodiment 4 of the present invention describes in detail another data transmission device. Referring to FIG. 7, the data transmission device according to this embodiment includes an allocation unit 301, a determination unit 302, and a transmission unit 303.

Allocation unit 301 determines the size of the frequency resource required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP) and the corresponding frequency resource for sending and receiving the data portion of the uplink OFDM PPDU. It is configured to assign a unit (RU).

The data portion of the uplink OFDM PPDU contains uplink user data and / or uplink user MAC control signaling.

The determination unit 302 is configured to determine one or more basic channel units in which the assigned frequency resource unit (RU) is located.

The basic channel unit is preferably a 20 MHz channel. Certainly, the basic channel unit in the present embodiment of the present invention is not limited to the 20 MHz channel, and any suitable channel can be used as the basic channel unit in the present embodiment of the present invention.

The transmit unit 303 sends and receives the data portion of the uplink OFDM PPDU on the assigned frequency resource unit (RU) and on one or more determined basic channels in the common signaling portion of the uplink OFDM PPDU. It is configured to send and receive at least some fields.

If the assigned frequency resource unit (RU) is located on multiple basic channels, the transmit unit 303 will be
A first configured to repeatedly send and receive at least some fields in the common signaling portion of an uplink OFDM PPDU on multiple basic channels by using multiple basic channels determined for each basic channel. Includes transmit unit 3031.

According to the technical solutions provided in this embodiment of the invention, the data in the data portion of the uplink OFDM PPDU scheduled by the access point (AP) is the frequency resource unit (RU) allocated by the allocation unit 301. Multiple basic channel units transmitted and received on and where the assigned frequency resource unit (RU) is located are determined by the decision unit 302, and at least some fields in the common signaling part of the uplink OFDM PPDU are the transmit unit. It is transmitted and received by 3031 on a plurality of determined basic channels. In this way, the plurality of basic channels for sending and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU are deterministic. When another user in traditional 802.11a / b / n / ac and 802.11ax BSS performs detection according to traditional CCA, the user sends and receives at least some fields in the common signaling part of the uplink OFDM PPDU. Multiple basic channels for this are detected to be busy and the user can send and receive data on another idle basic channel, thereby improving channel utilization. In addition, multiple users can send and receive data simultaneously on multiple basic channels, thereby improving service transmission speed.

The embodiments disclosed in the present invention further provide an access point, which may include any of the data transmission devices described above.

With reference to the data transmission methods described in the embodiments disclosed in the present invention, data transmission may be performed directly by hardware, memory executed by a processor, or a combination thereof. Accordingly, in correspondence with the methods and devices disclosed in embodiments of the invention, the invention further discloses a data transmission system. Specific embodiments are given below for detailed description.

As shown in FIG. 8, the data transmission system 1 includes a memory 11 and a processor 13 connected to the memory 11 by using the bus 12.

The memory 11 has a storage medium, which stores a data transmission program used to send and receive data in the uplink OFDM PPDU.

The memory 11 may include a high speed RAM memory and may include a non-volatile memory, for example, at least one magnetic disk memory.

Processor 13 is connected to memory 11 by using bus 12. When data is sent or received in the uplink OFDM PPDU, the processor 13 is used to send and receive data in the uplink OFDM PPDU and calls a data transmission method program stored in memory 11. The database search program may include program code, which contains a series of sequentially arranged operational instructions. The processor 13 may be a central processing unit (CPU) or an application-specific integrated circuit, or it may be one or more integrated circuits configured to implement the present embodiment of the invention.

Specifically, the data transmission method program stored in the memory and called by the processor 13
Determine the size of the frequency resource required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP) and provide the corresponding frequency resource unit (RU) to send and receive the data portion of the uplink OFDM PPDU. Assigning and
Determining one or more basic channel units in which the assigned frequency resource unit (RU) is located,
On the assigned frequency resource unit (RU), send and receive the data portion of the uplink OFDM PPDU, and on one or more determined basic channels, at least some fields in the common signaling portion of the uplink OFDM PPDU. May include sending and receiving.

With reference to the above, according to the technical solutions provided in this embodiment of the invention, the OFDM technique is introduced on the basis of the IEEE 802.11ax standard. The data in the data portion of the uplink OFDM PPDU scheduled by the access point (AP) is sent and received on the corresponding assigned frequency resource unit (RU) and the assigned frequency resource unit (RU) is placed1 One or more basic channel units are determined, and at least some fields in the common signaling portion of the uplink OFDM PPDU are transmitted and received on the determined basic channel. In this way, one or more basic channels for sending and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU are deterministic. When another user in traditional 802.11a / b / n / ac and 802.11ax BSS performs detection according to traditional CCA, the user sends and receives at least some fields in the common signaling part of the uplink OFDM PPDU. It detects that one or more basic channels for is busy and allows the user to send and receive data in another idle basic channel, thereby improving channel utilization. In addition, multiple users can send and receive data simultaneously on multiple basic channels, thereby improving service transmission speed.

The embodiments herein are described in a gradual manner with respect to the same or similar parts of the embodiments, reference may be made to these embodiments, each embodiment being another embodiment. Focuses on differences from morphology. The apparatus disclosed in the embodiments is described relatively briefly to correspond to the method disclosed in the embodiments, and references may be made to the description of the method for parts related to those of the method. ..

Those skilled in the art will further recognize that the unit and algorithm steps may be performed by electronic hardware or a combination of computer software and electronic hardware, in combination with the examples described in the embodiments disclosed herein. Can be done. In order to clearly illustrate compatibility between hardware and software, the configurations and steps of each example have been generally described above according to functionality. Whether a function is performed by hardware or software and hardware depends on the specific use and design constraints of the technical solution. One of ordinary skill in the art may use different methods to perform the functions described for each particular application, but the practice should not be considered beyond the scope of the invention.

In combination with the embodiments disclosed herein, the method or algorithm step may be performed by hardware, software modules executed by a processor, or a combination thereof. Software modules include random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs or It may be in any other form of storage medium known in the art.

The embodiments disclosed above are described to allow one of ordinary skill in the art to practice or use the invention. Various modifications to embodiments are apparent to those of skill in the art, and the general principles defined herein are practiced in other embodiments without departing from the spirit or scope of the invention. good. Accordingly, the invention is not limited to the embodiments described herein, but extends to the broadest scope according to the principles and novelty disclosed herein.

1 Data transmission system
11 Memory
13 processor
301 Allocation unit
302 decision unit
303 transmission unit
3031 First transmission unit

Claims (13)

A data transmission method that transmits an uplink orthogonal frequency division multiplex connection (OFDMA) physical layer convergence protocol data unit (PPDU) in bandwidth, said bandwidth consisting of multiple 20 MHz channels, said uplink OFDMA PPDU. Has a common signaling portion and a data portion, a frequency resource unit (RU) within the bandwidth is assigned to the data portion, and the RU is one or more 20 MHz channels in the bandwidth. The common signaling portion includes a legacy preamble and a high efficiency signal portion A (HE-SIG-A).
The bandwidth of the step of transmitting the legacy preamble and the HE-SIG-A by the station (STA) only on the one or more 20 MHz channels in which the allocated RU is located. A step and a step comprising one or more other 20 MHz channels beside the one or more 20 MHz channels in which the assigned RU is located.
With the step of transmitting the data portion in the uplink OFDM PPDU on the assigned RU by the STA.
A data transmission method. The step of transmitting the legacy preamble and the HE-SIG-A only on the one or more 20 MHz channels in which the assigned RU is located
The legacy preamble and the HE-SIG-A are duplicated, and the duplicated legacy preamble and the HE-SIG-A are obtained only over each of the plurality of 20 MHz channels in which the assigned RU is arranged. Steps to send
The method according to claim 1. The method of claim 1 or 2, wherein the data portion of the uplink OFDM PPDU comprises at least one of uplink user data or uplink user media access control (MAC) signaling. A step of transmitting a high efficiency short training field (HE-STF) and a high efficiency long training field (HE-LTF) in the uplink OFDM PPDU on the assigned RU.
The method according to any one of claims 1 to 3, further comprising. The method according to any one of claims 1 to 4, wherein the uplink OFDM PPDU is based on the 802.11ax standard. A data transmitter that transmits an uplink orthogonal frequency division multiplex connection (OFDMA) physical layer convergence protocol data unit (PPDU) in bandwidth, said bandwidth consisting of multiple 20 MHz channels, said uplink OFDMA PPDU. Has a common signaling portion and a data portion, a frequency resource unit (RU) within the bandwidth is assigned to the data portion, and the RU is one or more 20 MHz channels in the bandwidth. The common signaling portion includes a legacy preamble and a high efficiency signal portion A (HE-SIG-A).
A transmission unit configured to transmit the legacy preamble and the HE-SIG-A only on the one or more 20 MHz channels in which the allocated RU is located, said bandwidth. Is a transmit unit comprising one or more other 20 MHz channels beside the one or more 20 MHz channels in which the assigned RU is located.
Equipped with
The transmission unit is a data transmission device further configured to transmit the data portion in the uplink OFDM PPDU on the assigned RU. The transmitting unit replicates the legacy preamble and the HE-SIG-A, and the replicated legacy preamble and HE-only across each of the plurality of 20 MHz channels in which the assigned RU is located. The device of claim 6, further configured to transmit with and from SIG-A. The device of claim 6 or 7, wherein the data portion of the uplink OFDM PPDU comprises at least one of uplink user data or uplink user media access control (MAC) signaling. The transmitting unit further transmits a high efficiency short training field (HE-STF) and a high efficiency long training field (HE-LTF) in the uplink OFDM PPDU on the assigned RU. The apparatus according to any one of claims 6 to 8, which is configured. The apparatus according to any one of claims 6 to 9, wherein the uplink OFDM PPDU is based on the 802.11ax standard. Memory configured to store instructions, and
With one or more processors coupled to the memory
The one or more processors are configured to execute the instruction in order to cause the device to perform the method according to any one of claims 1 to 5. Data transmitter. The device according to claim 11, wherein the device is a station. A computer-readable storage medium comprising an instruction to execute the method according to any one of claims 1 to 5, when executed by a computer.

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