JP2020188499A - Data transmission method and device - Google Patents

Abstract

To provide a method device, a system, and an access point that simultaneously assign different channel resources to different users, allow a plurality of users to simultaneously access channels, and increase service transmission speed.SOLUTION: A data transmission method includes the steps of: transmitting and receiving data of a data part of an uplink OFDMA PPDU scheduled by an access point (AP) on a corresponding assigned frequency resource unit (RU); determining one or more basic channel units on which the assigned frequency resource unit (RU) is disposed; and transmitting and receiving at least some fields at a common signaling part of the uplink OFDMA PPDU on the determined one or more basic channels.SELECTED DRAWING: Figure 1

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, only one station sends and receives data to and from the access point simultaneously on the same channel or in the same spectrum. 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, and different channel resources can be allocated to different stations at the same time, that is, multiple stations can access the channels 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, the method of determining the size of frequency resources required by the data portion of an uplink OFDM PPDU scheduled by an access point (AP). 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 send and receive 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. Includes steps to send and receive fields in.

In the embodiment of the first aspect of the embodiment of the present invention, the step of transmitting and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU on the determined basic channels is 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 OFDM PPDU frame include only a Legacy preamble, the uplink OFDM PPDU. The data portion of the frame contains only ACK signaling, or the data portion of the uplink OFDM PPDU frame contains uplink user data and uplink user ACK signaling, where the ACK signaling belongs to 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 frequency resources required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP). An allocation unit configured to allocate the corresponding frequency resource unit (RU) for sending and receiving data parts of the uplink OFDM PPDU, and one or more basics on which the allocated frequency resource unit (RU) is 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 aspect of the 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, the system being a memory having 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 an uplink OFDMA PPDU. The data transmission method program is called, and the data transmission program described in 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 portion of 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 OFDMA 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, and one of ordinary skill in the art can further derive other drawings from these attached drawings without 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 resources used when the uplink OFDM PPDU frame is transmitted, as described in Embodiment 1 of the present application. FIG. 2b is a brief schematic 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 used when yet another uplink OFDM PPDU frame described in Embodiment 1 of the present application 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 configuration diagram of a 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 stated in the research process that OFDMA (Orthogonal Frequency Division Multiple Access) technology was used in the Institute of Electrical and Electronics Engineers (IEEE). 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, downlink data transmission is point-to-multipoint transmission rather than point-to-point transmission. Based on this, the inventor considers several multipoint to point transmission methods, such as the first method and the second method.

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 traditional 802.11a / b / n / ac and 802.11ax BSS performs detection according to 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.

In the second transmission method, if another user in the conventional 802.11a / b / n / ac and 802.11ax BSS detects the common signaling part in the conventional method, the content of the common signaling part transmitted by the uplink user. Is the same, but each scheduled uplink user is pre-allocated 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-to-point transmission method. In the transmission method, the data portion of the uplink OFDMA (orthogonal frequency-division multiplex access, 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 transmitted 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 OFDMA 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 one or more of the basic channels have a relatively large capacity. The base channel can accommodate at least some fields in the common signaling portion of the uplink OFDM PPDU. Thus, the complete common signaling portion is finally 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 according to the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings according to the embodiments of the present invention. Obviously, the embodiments described are merely a portion and not all of the embodiments of the present invention. All other embodiments obtained by one of ordinary skill in the art based on the 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 support 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 where the assigned frequency resource unit (RU) 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.

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 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 interval, HE-SIG-B length and 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 OFDMA 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 resources 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 portion 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 present 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 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 in the common signaling portion of the uplink OFDM PPDU frame in Embodiment 1 of the present invention; or Legacy preamble, HE-SIG-A and HE-SIG- 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 placed, 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 present invention is transmitted. It is a figure.

Alternatively, at least some fields in the common signaling portion 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 present 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 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 resources used when another uplink OFDM PPDU frame is transmitted, as described in Embodiment 1 of the present application.

For downlink OFDM PPDUs, 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 base 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 3rd and 4th 20s 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), at least in the common signaling portion of the uplink OFDM PPDU. Some fields are transmitted and received on one or more basic channels on which 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. When a user performs a discovery according to 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 BSS competes for an idle 20 MHz channel for the data portion, and another user in BSS sends and receives data on the idle base channel for the data portion. 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 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 finally 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 fields in the common signaling portion 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 OFDMA PPDU. It detects that one or more basic channels for is busy and allows the user to 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 2

Embodiment 2 of the present invention further discloses another data transmission method. As shown in FIG. 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 in which the assigned frequency resource units (RUs) are 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 that have been transmitted, received, and where the assigned frequency resource units (RUs) are located have been determined, and at least some fields in the common signaling portion 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 OFDMA 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 described in this embodiment includes an allocation unit 301, a determination unit 302, and a transmission unit 303.

The 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.

Transmission 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 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 interval, HE-SIG-B length and 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 OFDMA 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 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 present 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 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 RU-located. 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 allocated to frequency resources based on each basic channel unit.

For downlink OFDM PPDUs, 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 base 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 over 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 3rd and 4th 20s 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 where frequency resource units (RUs) are placed and are transmitted and received on one or more basic channels determined by 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 a user performs discovery according to traditional CCA, one or more 20 MHz channels are excluded and the user performs discovery on another idle 20 MHz channel for the data portion. In this transmission scheme, another user in BSS competes for an idle 20 MHz channel for the data portion, and another user in BSS sends and receives data on the idle base channel for the data portion. 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 finally 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 present 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 portion of the uplink OFDM PPDU are , Transmit and receive 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 OFDMA 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 described in this embodiment includes an allocation unit 301, a determination unit 302, and a transmission unit 303.

The 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.

Transmission 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 units (RUs) are located on multiple basic channels, the transmit unit 303 will
A first configured to iteratively 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 present 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 on a plurality of basic channels determined by 3031. 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 OFDMA 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 transmitters 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. Therefore, in response to 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 for transmitting and receiving 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 and 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 includes 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 embodiments of the present 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 units (RUs) will be located, and
Send and receive the data portion of the uplink OFDM PPDU on the assigned frequency resource unit (RU) 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 the present embodiment of the present invention, the OFDM technology is introduced based on the IEEE 802.11ax standard. The data portion of 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 OFDMA PPDU. It detects that one or more of the 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.

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 device disclosed in the embodiment is described relatively briefly to correspond to the method disclosed in the embodiment, 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 can 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 configuration 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 steps 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 present invention. Various modifications to the embodiments will be apparent to those skilled 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. Thus, 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 Assignment unit
302 decision unit
303 transmission unit
3031 First transmit unit

Claims (9)

It is a data transmission method
The corresponding frequency resource unit (RU) for determining the size of the frequency resource required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP) and transmitting and receiving the data portion of the uplink OFDM PPDU. ) And the steps to assign
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), the data portion of the uplink OFDM PPDU is transmitted and received, and on the determined basic channel, in the common signaling portion of the uplink OFDM PPDU. A method that includes steps to send and receive at least some fields. The step of transmitting and receiving at least some fields in the common signaling portion of the uplink OFDM PPDU on the determined basic channels
A step of duplicating and transmitting at least some fields in the common signaling portion of the uplink OFDM PPDU is included on the plurality of basic channels via the plurality of basic channels determined for each basic channel. , The method of claim 1. The method of claim 1, wherein the data portion of the uplink OFDM PPDU comprises uplink user data and / or uplink user MAC control signaling. The at least some fields in the common signaling portion transmitted and received on the one or more basic channels are the Legacy preamble and HE-SIG-A, or the Legacy preamble, HE-. The method of claim 1 or 2, comprising SIG-A and HE-SIG-B. If at least some of the fields in the common signaling part of the uplink OFDMA PPDU frame contain only a Legacy preamble, then the data part of the uplink OFDMA PPDU frame contains only ACK signaling or , The data portion of the uplink OFDM PPDU frame includes uplink user data and uplink user ACK signaling, the ACK signaling belongs to MAC signaling, and the ACK signaling is based on each basic channel unit. The method of claim 1, further comprising being placed within a frequency resource. It is a data transmitter
The corresponding frequency resource unit (RU) for determining the size of the frequency resource required by the data portion of the uplink OFDM PPDU scheduled by the access point (AP) and transmitting and receiving the data portion of the uplink OFDM PPDU. ) And the allocation unit that is configured to allocate
A decision unit configured to determine one or more basic channel units in which the assigned frequency resource unit (RU) is located, and
On the assigned frequency resource unit (RU), the data portion of the uplink OFDM PPDU is transmitted and received, and on the determined basic channel, in the common signaling portion of the uplink OFDM PPDU. A device that includes a transmit unit that is configured to send and receive at least some fields. The transmitting unit overlaps at least some of the fields in the common signaling portion of the uplink OFDM PPDU on the plurality of basic channels via the plurality of basic channels determined for each basic channel. The device of claim 6, comprising a first transmit unit configured to transmit and receive. An access point comprising the data transmitter according to claim 6 or 7. It is a data transmission system
A memory having a storage medium, wherein the memory stores a data transmission program used for transmitting and receiving data in the uplink OFDM PPDU.
When the data is transmitted and received in the uplink OFDMA PPDU, the processor calls the data transmission method program stored in the memory, including a processor connected to the memory by using the bus. , A system that executes the data transmission program according to the method according to any one of claims 1 to 5.

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