CN109151999B

CN109151999B - Information transmission method and communication node

Info

Publication number: CN109151999B
Application number: CN201710502447.2A
Authority: CN
Inventors: 韩霄; 淦明; 杨讯; 李云波; 李彦淳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-06-27
Filing date: 2017-06-27
Publication date: 2022-10-11
Anticipated expiration: 2037-06-27
Also published as: CN109151999A

Abstract

The embodiment of the application provides an information transmission method and a communication node, wherein the information transmission method comprises the following steps: the initiating node sends a first frame to a plurality of responding nodes; and the initiating node receives second frames returned by the plurality of responding nodes at the same time, and the second frames returned by different responding nodes are the same. According to the method and the device, the time for the initiating node and the responding node to carry out the channel protection process in a multi-user transmission scene can be shortened, and the network throughput and the information robustness are improved.

Description

Information transmission method and communication node

Technical Field

The present application relates to communications technologies, and in particular, to an information transmission method and a communications node.

Background

The appearance of Wireless Local Area Networks (WLANs) greatly facilitates people's daily life, and people can enjoy high-quality network services brought by WLANs at a very low price. However, most of the existing mainstream wlan works in 2.4GHz and 5GHz bands, and as the number of devices increases, the low frequency band with insufficient bandwidth becomes very crowded, and the industry starts to search for new frequency band to provide higher-speed wireless communication. Among them, the 60GHz millimeter wave band has a large amount of available spectrum resources, so the 60GHz band will be widely applied in the future.

Channel protection is usually performed before information transmission in the wlan. However, the existing channel protection scheme has long time, poor robustness and limited network throughput.

Disclosure of Invention

The application provides an information transmission method and a communication node, which are used for shortening the time of carrying out a channel protection process by an initiating node and a responding node in a multi-user transmission scene and improving the network throughput and the information robustness.

In a first aspect, the present application further provides an information transmission method, including:

the initiating node sends a first frame to a plurality of responding nodes and receives second frames returned by the responding nodes at the same time, and the second frames returned by different responding nodes are the same.

In the method, the initiating node can receive the second frames returned by the multiple responding nodes at the same time, so that the time of a channel protection process between the initiating node and the responding nodes in a multi-user transmission scene is effectively shortened, the network throughput is improved, in addition, the second frames returned by different responding nodes are the same, the information robustness in the channel protection process is effectively improved, the decoding complexity of the initiating node for the second frames is also reduced, and the accuracy of the decoded information is ensured.

Meanwhile, the plurality of response nodes return the second frame at the same time, so that timing errors among different response nodes can be avoided, and the accuracy of time efficiency is ensured.

In one implementation, in the method described above, the sending, by the initiating node, the first frame to the plurality of responding nodes may include:

the initiating node transmitting the first frame to the plurality of responding nodes on a high frequency channel;

correspondingly, the receiving, by the initiating node, the second frame returned by the multiple responding nodes at the same time includes:

the initiating node receives a second frame on the high frequency channel returned by the plurality of responding nodes simultaneously.

The information transmission method is suitable for a high-frequency channel, effectively shortens the time of carrying out a channel protection process between the initiating node and the responding nodes in a multi-user transmission scene of the high-frequency channel, effectively improves the information robustness in the channel protection process on the high-frequency channel because the second frames returned by different responding nodes are the same, reduces the decoding complexity of the initiating node for the second frames, and ensures the accuracy of the decoded information.

In another implementation, the second frame is a clear to send CTS frame, a directed multi-gigabit clear to send DMG CTS frame, or a directed multi-gigabit deny to send DMG DTS frame.

In yet another implementation, the second frame returned by the different responding node may include: the same transmission address TA.

In yet another implementation, the same TA is any one of:

the first frame comprises a preset address, a broadcast address, a multicast address, an address which is the same as a receiving address RA included in the first frame, and an address indicated by preset indication information.

In yet another implementation, the second frame returned by the different responding node as shown above further includes: the same scrambling initialization value.

In yet another implementation, the same scrambling initialization value is any one of:

a preset scramble initialization value, a value identical to the scramble initialization value included in the first frame, and a scramble initialization value indicated by preset indication information.

In yet another implementation, the first frame includes: the identifiers of the plurality of response nodes, or the group identifiers of the response nodes in the plurality of response nodes.

In yet another implementation, the first frame further includes: first indication information for indicating whether each responding node needs to reply to the second frame.

In yet another implementation, the first frame further includes: and second indication information, wherein the second indication information is used for indicating the type of the second frame replied by each responding node.

In yet another implementation, the first frame further includes: third indication information indicating a value of TA in a second frame replied by each responding node.

In yet another implementation, the first frame further includes: fourth indication information for indicating a manner in which each responding node replies to the second frame.

In yet another implementation, the sending, by the initiating node, the first frame to the plurality of responding nodes as shown above may include:

the initiating node transmits the first frame to the plurality of responding nodes on a plurality of channels.

In yet another implementation, the first frame further includes: fifth indication information for indicating to each responding node to determine a channel to reply to the second frame.

In a second aspect, the present application further provides an information transmission method, including;

a response node receives a first frame sent by an initiating node;

and the response node and other response nodes return a second frame to the initiating node at the same time, and the second frames returned by different response nodes are the same.

In one implementation, the receiving, by the responding node, the first frame sent by the initiating node, as shown above, may include:

The responding node receives the first frame sent by the initiating node on a high-frequency channel;

correspondingly, the returning of the second frame to the initiating node by the responding node and other responding nodes at the same time may include:

the responding node returns a second frame to the initiating node on the high frequency channel simultaneously with other responding nodes.

In another implementation, the second frame is a Clear To Send (CTS) frame, a directed multi-gigabit allowed to send (DMG CTS) frame, or a directed multi-gigabit denied to send (DMG DTS) frame.

In yet another implementation, the second frame returned by the different responding node includes: the same transmission address TA.

In yet another implementation, the same TA is any of:

a preset address, a broadcast address, a multicast address, an address identical to the reception address RA included in the first frame, and an address indicated by the preset indication information.

In yet another implementation, the second frame returned by the different responding node further includes: the same scrambling initialization value.

In yet another implementation, the first frame further includes: first indication information;

before the responding node returns the second frame to the initiating node simultaneously with other responding nodes, the method further includes:

the responding node determines whether a second frame needs to be replied according to the first indication information.

In yet another implementation, the first frame further includes: second indication information;

before the responding node returns the second frame to the initiating node simultaneously with other responding nodes, the method may further include:

and the responding node determines whether the type of the second frame needs to be replied or not according to the second indication information.

In yet another implementation, the first frame further includes: third indication information;

before the responding node returns a second frame to the initiating node simultaneously with other responding nodes, the method further includes:

and the responding node determines whether the value of the TA in the second frame needs to be replied or not according to the third indication information.

In yet another implementation, the first frame further includes: fourth indication information;

Before the responding node returns the second frame to the initiating node simultaneously with other responding nodes as shown above, the method may further include:

and the responding node determines whether a second frame needs to be replied according to the fourth indication information.

In yet another implementation, the receiving, by the responding node, the first frame sent by the initiating node as shown above may include:

the responding node receives the first frame transmitted by the initiating node on a plurality of channels.

In yet another implementation, the first frame may further include: fifth indication information;

and the responding node determines a channel for replying a second frame according to the fifth indication information.

In a third aspect, the present application further provides a communications node, comprising:

the processing module is used for controlling to send a first frame to a plurality of response nodes and controlling to receive a second frame returned by the plurality of response nodes at the same time, and the second frames returned by different response nodes are the same;

a sending module, configured to send the first frame to the plurality of response sections;

and the receiving module is used for receiving the second frames returned by the plurality of responding nodes at the same time.

In one implementation, the processing module is specifically configured to control sending the first frame to the plurality of responding nodes on a high-frequency channel, and control receiving a second frame returned by the plurality of responding nodes at the same time on the high-frequency channel.

In yet another implementation, the same TA is any one of:

In yet another implementation, the processing module is specifically configured to control sending the first frame to the plurality of responding nodes over a plurality of channels.

In a fourth aspect, the present application further provides a communications node, comprising;

the processing module is used for controlling to receive the first frame sent by the initiating node and controlling to return a second frame to the initiating node simultaneously with other responding nodes, and the second frames returned by different responding nodes are the same;

A receiving module, configured to receive a first frame sent by the initiating node;

and the sending module is used for returning the second frame to the initiating node simultaneously with other responding nodes.

In an implementation manner, the processing module is specifically configured to control to receive the first frame sent by the originating node on a high-frequency channel, and control to return a second frame to the originating node on the high-frequency channel simultaneously with other responding nodes.

In yet another implementation, the same TA is any one of:

In yet another implementation, the first frame includes: the identification of the plurality of responding nodes, or the group identification of each responding node in the plurality of responding nodes.

and the processing module is also used for determining whether the second frame needs to be replied according to the first indication information.

and the processing module is also used for determining whether the type of the second frame needs to be replied according to the second indication information.

and the processing module is further used for determining whether the value of the TA in the second frame needs to be replied according to the third indication information.

and the processing module is further used for determining whether a second frame mode needs to be replied according to the fourth indication information.

In still another implementation manner, the processing module is specifically configured to control receiving the first frame sent by the originating node on multiple channels.

In yet another implementation, the first frame further includes: fifth indication information;

and the processing module is further used for determining a channel for replying the second frame according to the fifth indication information.

In a fifth aspect, the present application further provides a communications node, comprising: a processor, a transmitter and a receiver; the transmitter and the receiver are respectively connected with the processor;

the processor is used for controlling to send a first frame to a plurality of response nodes and controlling to receive second frames returned by the plurality of response nodes at the same time, and the second frames returned by different response nodes are the same;

a transmitter for transmitting the first frame to the plurality of response sections;

and the receiver is used for receiving the second frames returned by the plurality of responding nodes at the same time.

In one implementation, the processor is specifically configured to control sending a first frame to a plurality of responding nodes on a high frequency channel, and to control receiving a second frame returned by the plurality of responding nodes simultaneously on the high frequency channel.

In yet another implementation, the same TA is any one of:

In yet another implementation, the same scrambling initialization value is any of:

In yet another implementation, the first frame further includes: and second indication information, which is used for indicating the type of the second frame replied by each responding node.

In yet another implementation, the first frame further includes: third indication information for indicating a value of TA in a second frame replied by each responding node.

In yet another implementation, the first frame further includes: and fourth indication information, wherein the fourth indication information is used for indicating the mode of each responding node for replying the second frame.

In yet another implementation, a processor is particularly configured to control sending the first frame to the plurality of responding nodes over a plurality of channels.

In a sixth aspect, the present application further provides a communications node, including; a processor, a receiver, and a transmitter; the receiver and the transmitter are respectively connected with the processor;

the processor is used for controlling to receive the first frame sent by the initiating node and controlling to return a second frame to the initiating node simultaneously with other responding nodes, and the second frames returned by different responding nodes are the same;

a receiver, configured to receive a first frame sent by the originating node;

and the transmitter is used for returning the second frame to the initiating node simultaneously with other responding nodes.

In one implementation, the processor is specifically configured to control receiving the first frame sent by the originating node on a high frequency channel, and to control returning a second frame to the originating node on the high frequency channel simultaneously with other responding nodes.

In yet another implementation, the same TA is any one of:

And the processor is also used for determining whether the second frame needs to be replied according to the first indication information.

and the processor is also used for determining whether the type of the second frame needs to be replied or not according to the second indication information.

and the processor is further used for determining whether the value of the TA in the second frame needs to be replied according to the third indication information.

and the processor is also used for determining whether a second frame needs to be replied or not according to the fourth indication information.

In yet another implementation, a processor is particularly configured to control receiving a first frame transmitted by an originating node over a plurality of channels.

and the processor is further used for determining a channel for replying the second frame according to the fifth indication information.

In a seventh aspect, an embodiment of the present application further provides a computer program product, where the computer program product includes a program code corresponding to any information transmission method executed by an originating node, where the program code is used to execute the method provided in the first aspect of the embodiment of the present application.

In an eighth aspect, an embodiment of the present application further provides a computer-readable storage medium for storing a computer program product, where the computer program product includes: the program code may include a program code corresponding to any information transmission method for executing the initiating node provided in the first aspect of the embodiment of the present application.

In a ninth aspect, an embodiment of the present application further provides a computer program product, where the computer program product includes program code corresponding to any information transmission method executed by a receiving node, where the program code is used to execute the method provided in the second aspect of the embodiment of the present application.

In a tenth aspect, embodiments of the present application further provide a computer-readable storage medium for storing a computer program product, where the computer program product includes: the program code may include a program code corresponding to any information transmission method executed by the receiving node according to the second aspect of the embodiment of the present application.

According to the information transmission method and the communication node provided by the embodiment of the application, the initiating node can send the first frame to the plurality of responding nodes and receive the second frames returned by the plurality of responding nodes at the same time, so that the channel protection between the initiating node and the plurality of responding nodes is realized, wherein the second frames returned by different responding nodes are the same. In the method, the initiating node can receive the second frames returned by the multiple responding nodes at the same time, so that the time for performing a channel protection process between the initiating node and the responding nodes in a multi-user transmission scene is effectively shortened, the network throughput is improved, in addition, the second frames returned by different responding nodes are the same, the information robustness in the channel protection process is effectively improved, the decoding complexity of the initiating node for the second frames is also reduced, and the accuracy of the decoded information is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a network system applicable to various embodiments of the present application;

fig. 2 is a schematic structural diagram of a communication node according to an embodiment of the present application;

fig. 3 is a flowchart of an information transmission method according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a DMG CTS frame according to an embodiment of the present disclosure;

fig. 5 is a flowchart of a method for single-channel transmission between an initiating node and a responding node in an information transmission method according to an embodiment of the present application;

fig. 6 is a flowchart of a method for transmitting multiple single channels by an initiating node and a responding node in an information transmission method according to an embodiment of the present application;

fig. 7 is a first schematic structural diagram of a communication node according to an embodiment of the present application;

fig. 8 is a first schematic structural diagram of another communication node according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication node according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of another communication node according to an embodiment of the present application.

Detailed Description

The information transmission method and the communication node provided by the embodiments of the present application are applicable to a Wireless Local Area Network (WLAN) system, and in particular, to a WLAN system of the 802.11ad standard, the 802.11ay standard, and subsequent improved standards thereof. Fig. 1 is a schematic structural diagram of a network system to which embodiments of the present invention are applicable. As shown in fig. 1, the network system to which the information transmission method is applied may include, for example, a network device and at least one user device. For the WLAN system, the network device may be, for example, a Basic Service Set Control Point (PCP)/Access Point (AP). The user equipment may be a STAtion (STA). The user device may be, for example, a smartphone, tablet, laptop, or other wireless communication device.

The initiating node according to the following embodiments of the present application may be a network device or a user equipment, and the responding node may be a network device or a user equipment. For example, if the initiating node is a network device, the responding node is a user device or a network device; if the initiating node is the user equipment, the responding node can be the network equipment or the user equipment.

The following provides a brief explanation of the structure of a communication node according to the present application, which can be used as both an initiator node and a responder node. Fig. 2 is a schematic structural diagram of a communication node according to an embodiment of the present application. As shown in fig. 2, the communication node may include: a processor 201, a Media Access Control (MAC) layer module 202, a Physical (PHY) layer module 203, a memory module 204, and a storage module 205. Memory module 204 may store software code or program instructions, which may also be referred to as firmware. The storage module 205 may store information required by the software code or program instructions. The processor 201 may control the MAC layer module 202 and the PHY layer 203 by calling software codes or program instructions stored in the memory module 204 and combining information stored in the storage module 205, so as to implement the information transmission method provided in each embodiment described below in the present application. The processor 201 may be, for example, a Central Processing Unit (CPU), the MAC layer module 202 may be, for example, a High frequency Media Access Control (HF MAC) layer module, the PHY layer 203 may be, for example, a High frequency physical (HF PHY) layer module, the Memory module 204 may be, for example, a Read-Only Memory (ROM), and the storage module 205 may be, for example, a Random Access Memory (RAM). The modules in the communication node are only for illustration, and the application is not limited thereto.

The information transmission method provided by the embodiment of the present application is described below with reference to a plurality of examples.

Fig. 3 is a flowchart of an information transmission method according to an embodiment of the present application. The information transmission method can be interactively executed by the initiating node and a plurality of responding nodes. As shown in fig. 3, the information transmission method may include:

s301, the initiating node (Initiator) sends a first frame to a plurality of responding nodes (responders).

Specifically, the initiating node may send the first frame to the plurality of responding nodes at the same time, or may send the first frame to the plurality of responding nodes in advance.

If the initiating node sends the first frame to the Multiple responding nodes at the same time, the initiating node may send at least one same first frame, that is, at least one first frame including the same information, to the Multiple responding nodes in a Multi-User-Multiple-Input-Multiple-Output (MU-MIMO) manner, where each first frame in the at least one first frame may correspond to one sending direction. For example, if the responding nodes are within the coverage of a sending direction of the initiating node, the initiating node may send the first frame to the responding nodes in a sending direction. If the plurality of responding nodes may correspond to three coverage areas of the initiating node, for example, a part of the responding nodes may be located within a coverage area of a sending direction of the initiating node, the initiating node may send one of the first frames to a part of the responding nodes in one sending direction, send another one of the first frames to another part of the responding nodes in another sending direction, and send another one of the first frames to another part of the responding nodes in yet another sending direction.

Correspondingly, for the responding node, the method may further include:

s302, each response node receives the first frame sent by the initiating node.

The first frame received by each responding node may be the same first frame.

After each responding node receives the first frame, the method may further include:

s303, the plurality of response nodes send second frames to the initiating node at the same time, and the second frames returned by different response nodes are the same.

After receiving the first frame, each responding node needs to return the second frame to the initiating node, so as to realize channel protection for each responding node and the initiating node and avoid information transmission interference generated by channel competition of other devices.

For each responding node, each responding node may return the second frame to the initiating node in a Single Input Single Output (SISO) manner. The each responding node may return the second frame to the initiating node using the sending direction of the each responding node for the initiating node. Each responding node may return the second frame to the initiating node using a pre-trained transmit direction.

For example, if the initiating node is located in the range of the sending direction 1 of the responding node 1, located in the range of the sending direction 2 of the responding node 2, and located in the range of the sending direction 3 of the responding node 3, the responding node 1 may return the second frame to the initiating node by using the sending direction 1, the responding node 2 may return the second frame to the initiating node by using the sending direction 2, and the responding node 3 may return the second frame to the initiating node by using the sending direction 3.

For the originating node, the method may further include:

s304, the initiating node receives the second frames returned by the plurality of responding nodes at the same time, and the second frames returned by different responding nodes are the same.

The initiating node sends the first frame to the plurality of responding nodes and receives the second frame returned by the plurality of responding nodes at the same time, so that the initiating node and other nodes except the plurality of responding nodes can perform silence in a preset time period under the condition of monitoring the frames transmitted between the initiating node and the plurality of responding nodes, and the other nodes can avoid channel collision generated by the communication between the initiating node and the plurality of responding nodes, so as to realize channel protection for the initiating node and the plurality of responding nodes.

According to the information transmission method provided by the embodiment of the application, the first frame can be sent to the multiple response nodes through the initiating node, and the second frames returned by the multiple response nodes at the same time are received, so that the channel protection between the initiating node and the multiple response nodes is realized, wherein the second frames returned by different response nodes are the same. In the method, the initiating node can receive the second frames returned by the multiple responding nodes at the same time, so that the time for performing a channel protection process between the initiating node and the responding nodes in a multi-user transmission scene is effectively shortened, the network throughput is improved, in addition, the second frames returned by different responding nodes are the same, the information robustness in the channel protection process is effectively improved, the decoding complexity of the initiating node for the second frames is also reduced, and the accuracy of the decoded information is ensured.

On the basis of the above method, the present application may further provide another information transmission method, where in the another information transmission method, if the initiating node may receive the second frame returned by the responding node in an MIMO manner, the second frames returned by different responding nodes may be the same or different.

Alternatively, as shown above, it should be noted that the information transmission method may be applicable to a high frequency channel, that is, in the information transmission method, the initiating node and the responding node may perform information transmission on the high frequency channel. The sending, by the originating node, the first frame to the plurality of responding nodes in S301 may include:

the initiating node may transmit the first frame to a plurality of responding nodes on a high frequency channel.

Thus, each responding node in S302 above may receive the first frame sent by the initiating node on the high frequency channel.

The step of sending the second frame to the initiating node by the multiple responding nodes in S303 may include:

the plurality of responding nodes simultaneously transmit a second frame to the initiating node on the high frequency channel.

Thus, the initiating node may receive the second frame returned by multiple responding nodes simultaneously on the high frequency channel in S304 described above.

When the information transmission method is suitable for a high-frequency channel, the channel protection of the initiating node and the plurality of responding nodes on the high-frequency channel can be realized through the information transmission method.

The high frequency channel is a channel with a channel frequency greater than a preset frequency, and the preset frequency may be 6GHz, for example.

The high frequency channel as described above may be, for example, a millimeter wave channel, such as a 60GHz channel. Of course, the high frequency channel may also be a channel of other frequencies, which is only an example and is not limited in this application.

The high frequency channel may be, for example, a high frequency channel involved in a Next Generation 60GHz (Next Generation 60ghz, ng60) wireless local area network, a Future 60GHz (Future Generation 60ghz, fg60) wireless local area network, or other wireless local area network. The NG60 wlan may be a wlan based on 802.11ay technology evolved from 802.11ad technology, and the NG60 wlan may be a wlan based on a mixture of high and low frequencies formed by low frequency channel technology such as 802.11n, 802.11ac, 802.11ax, etc. and high frequency channel technology such as 802.11ad and 802.11ay, etc.

The information transmission method provided by the embodiment of the application is suitable for a high-frequency channel, the time for carrying out a channel protection process between the initiating node and the responding nodes in a multi-user transmission scene of the high-frequency channel is effectively shortened, in addition, the second frames returned by different responding nodes are the same, the information robustness in the channel protection process on the high-frequency channel is effectively improved, the decoding complexity of the initiating node for the second frames is also reduced, and the accuracy of the decoded information is ensured.

Alternatively, if the information transmission method is applied To a high frequency channel, the first frame may be a Clear To Send To self (CTS-To-self) frame, a Directional Multi-Gigabit Clear To Send To self (DMG CTS-To-self) frame, a Request To Send (RTS) frame, or a Multi-User Request To Send (MU-RTS) frame, as shown above.

The second frame is a Clear To Send (CTS) frame, a Directional Multi-Gigabit Clear To Send (DMG CTS) frame, or a Directional Multi-Gigabit deny To Send (DMG DTS) frame.

Alternatively, the second frame returned by a different responding node as shown above may include the same Transmit Address (TA).

Fig. 4 is a schematic structural diagram of a DMG CTS frame according to an embodiment of the present application, which is described below with reference to an example. As shown in fig. 4, the DMG CTS frame may include: a Frame Control (Frame Control) field of 2 bytes, a Duration (Duration) field of 2 bytes, a (Receive Address, RA) field of 6 bytes, a TA field of 6 bytes, and a Frame Check Sequence (FCS) field of 5 bytes.

If the second frame is a DMG CTS frame, the TA fields in the second frame returned by different responding nodes may have the same value.

Optionally, the same TA may be any one of: a preset address, a broadcast address, a multicast address, an address identical to the RA included in the first frame, and an address indicated by the preset indication information.

For example, the predetermined address may be an address corresponding to a bit value of 0 in all fields where the TA is located. The broadcast address or the multicast address can be an address corresponding to a bit value 1 in a field of the TA, and can be represented as FF: FF.

The first frame sent by the initiating node to the plurality of responding nodes may generally include an RA and a TA, where the TA of the first frame may generally be an identification of the initiating node, such as a MAC address of the initiating node. The RA of the first frame may be a broadcast address, a multicast address, or the same address as the TA of the first frame, etc.

For the responding node, after receiving the first frame, the TA and the RA included in the first frame may be exchanged, the TA of the obtained second frame may be the RA of the first frame, and the RA of the obtained second frame is the TA of the first frame, so that the second frames returned by different responding nodes include the same TA, and the same TA may be the same address as the RA of the first frame.

For example, if the first frame is DMG CTS-to-self, both TA and RA of the first frame are the identity of the initiating node, such as the MAC address of the initiating node. If the second frame is a DMG CTS frame, TA and RA in the second frame returned by different responding nodes may both be the identifier of the initiating node, such as the MAC address of the initiating node. That is, in this case, the TA of the second frame returned by a different responding node may be the same as the RA included in the first frame and also the RA in the second frame.

The address indicated by the preset indication information may be an address indicated by the preset indication information issued by the initiating node or other upper layer devices. Different responding nodes can have the same preset indication information, so that the TAs in the second frames returned by different responding nodes can all be the addresses indicated by the preset indication information.

Optionally, the second frame returned by the different responding node as shown above may further include: the same scrambling initialization (scrambling) value. The scrambling initialization value may be located in a physical header of the second frame.

The second frames returned by different response nodes comprise the same scrambling initialization value, so that the second frames returned by different response nodes have the same scrambling, the second frames returned by different response nodes are effectively ensured to be the same, the decoding complexity of the initiating node for the second frames is reduced, and the accuracy of the decoded information is ensured.

Optionally, the same scrambling initialization value as shown above is any one of the following:

The first frame sent by the initiating node to the plurality of responding nodes may also generally include a scrambling initialization value, and for a responding node, after receiving the first frame, the scrambling initialization value of the second frame may be set according to the scrambling initialization value included in the first frame, so that the scrambling initialization value included in the second frame is the scrambling initialization value included in the first frame, and thus, second frames returned by different responding nodes may include the same scrambling initialization value, and the same scrambling initialization value may be all the same as the scrambling initialization value of the first frame.

The scrambling initialization value indicated by the preset indication information may be a scrambling initialization value indicated by the preset indication information issued by the originating node or other upper layer devices. Different responding nodes can have the same preset indication information, so that the scrambling initialization values in the second frames returned by different responding nodes can be the scrambling initialization values indicated by the preset indication information.

Optionally, in the methods shown above, the first frame may include: the identifiers of the plurality of response nodes, or the group identifiers of the response nodes in the plurality of response nodes, and the like. Wherein the Group ID may be an extended Directional Multi-Gigabit Group ID (EDMG Group ID).

The Group identity is an extended directed multi-gigabit Group identity (EDMG Group ID of target MU Group) indicating a target multi-user Group in which each responding node is located. If the value of SISO or MIMO domain in the first frame is 0 or the value of MIMO domain of Single User or multi-User (Single User or multi User) is 0, the first frame may include: and identifying the group where each response node in the plurality of response nodes is located.

The first frame may have a Control Trailer (CT) field, an identification of the plurality of responding nodes, or a group identification of each of the plurality of responding nodes may be located in the CT field of the first frame.

For example, if the responding node is a station, the CT field of the first frame may include an identification of a plurality of stations or an EDMG Group ID of each station of the plurality of stations.

Optionally, the first frame as shown above may further include: first indication information for indicating whether each responding node needs to reply to the second frame.

After receiving the first frame sent by the initiating node, each responding node can determine whether to reply to the second frame according to the first indication information, and if so, returns the second frame to the initiating node.

The first indication information may also be located in a CT field of the first frame. This first indication information may be referred to as reply required indication (response required) information. The first indication information may occupy at least one bit in a CT field of the first frame. Taking a bit as an example, if the bit where the first indication information is located is 1, the first indication information is used to enable each responding node to need to return a second frame, where the second frame may be a DMG CTS frame, for example; if the bit of the first indication information is 0, the first indication information is used to make each responding node not need to return the second frame.

If the MIMO domain value of a Single User or multiple users (Single User or multi-User) in the first frame is 0, the first frame may include: the first indication information.

Optionally, the first frame as shown above may further include: and second indication information, wherein the second indication information is used for indicating the type of the second frame replied by each responding node. The second indication information may be referred to as frame type indication information, and may be used to indicate whether the type of the second frame replied by each responding node is a CTS frame or a DMG CTS frame.

After each responding node receives the first frame sent by the initiating node, the type of the second frame to be replied can be determined to be a CTS frame or a DMG CTS frame according to the second indication information.

The second indication information may be located in a CT field of the first frame, and the second indication information may occupy at least one bit in the CT field of the first frame. Taking a bit as an example, if the bit where the second indication information is located is 1, the second indication information is used to indicate that each responding node needs to return a second frame as a DMG CTS frame; and if the bit where the second indication information is located is 0, the second indication information is used for indicating that each response node returns that the second frame is a CTS frame.

Optionally, in the method shown above, the first frame may further include: third indication information indicating a value of TA in the second frame in which each responding node indicates a reply.

The third indication information may be referred to as TA indication information, and after each responding node receives the first frame sent by the initiating node, the responding node may determine a value of a TA in a second frame to be replied according to the third indication information.

The third indication information may also be located in a CT field of the first frame, and the third indication information may occupy at least one bit in the CT field of the first frame.

Optionally, the first frame as shown above may further include: fourth indication information for indicating a manner in which each responding node replies to the second frame.

The fourth indication information may also be referred to as a reply mode indication information, and the fourth indication information may be used to indicate whether each responding node replies to the second frame in a serial reply mode or a parallel reply mode, for example.

If each responding node determines that the mode for replying the second frame is the serial replying mode according to the fourth indication information, the responding nodes can sequentially and serially return the second frame to the initiating node according to a preset replying sequence. If each responding node determines that the mode for replying the second frame is a parallel replying mode according to the fourth indication information, the multiple responding nodes can simultaneously return the second frame to the initiating node.

The fourth indication information may also be located in the CT field of the first frame, and the fourth indication information may occupy at least one bit in the CT field of the first frame. Taking a bit as an example, if the bit where the fourth indication information is located is 1, the fourth indication information is used to indicate that the manner in which each responding node replies the second frame is a serial reply manner; if the bit of the fourth indication information is 0, the fourth indication information is used to indicate that the mode in which each responding node returns the second frame is a parallel reply mode, i.e., a simultaneous reply mode.

Optionally, the information transmission method described in any of the above may be applied to multi-channel transmission, and the multiple channels may all be high-frequency channels. As shown above, the sending, by the initiating node, the first frame to the plurality of responding nodes in S301 may include:

The plurality of channels may be high frequency channels.

The initiating node may send the first frame to a partial responding node of the plurality of responding nodes on one channel and send the first frame to another partial responding node of the plurality of responding nodes on another channel. The initiating node may send the first frame to the plurality of responding nodes on each of the plurality of channels.

For example, if the plurality of responding nodes are three stations, the initiating node may send a first frame on channel 1 for station 1 and send a first frame on channel 2 for stations 2 and 3.

Optionally, the first frame as shown above may further include: fifth indication information for indicating a channel for each responding node to reply to the second frame.

The initiating node may instruct each responding node to reply to the channel of the second frame according to the order of each responding node within the group. The channel indication sequence of the fifth indication information corresponding to each response node in the first frame can be consistent with the sequence of each response node in the group. The order of the response nodes within the Group may be determined, for example, according to a setting unit of the EDMG Group ID.

In another implementation of multi-channel transmission, if the initiating node sends a first frame to responding nodes on the multiple channels, the multiple responding nodes may directly return a second frame to the initiating node on the multiple channels without additional indication information.

For example, if the initiating node sends a first frame to multiple responding nodes on channel 1 and channel 2, each responding node may return the second frame to the initiating node on both channel 1 and channel 2.

It should be noted that, before replying the second frame, the responding node needs to perform a Channel Clear Assessment (CCA) on the reply channel, and if the reply channel is in a clear state, the responding node returns the second frame to the initiating node on the reply channel.

Of course, the initiating node may also configure channels for replying the second frame for the multiple responding nodes in other manners, which is not limited in this application. For example, the initiating node indicates, in the first frame, an identifier of one responding node first, and then indicates a channel corresponding to the one responding node for replying to the second frame.

The fifth indication information may also be located in the CT field of the first frame, and the fifth indication information may occupy a plurality of bits in the CT field of the first frame. This fifth indication information may be referred to as a reply channel (reply channel) indication information, which may also be referred to as a bitmap (bit map) of the reply channel.

The specific structure of the bitmap of the reply channel is similar to the structure of the bitmap in the channel BANDWIDTH parameter (CH _ BANDWIDTH parameter) in the transmit vector (TX vector) in the first frame. The bit map of the reply channel corresponding to each responding node can be used to indicate that the channel to which each responding node needs to reply the second frame is a specific channel in the multiple channels. The plurality of channels may be, for example, a plurality of 2.16GHz channels.

The first frame may further include: frequency Division Multiple Access (FDMA) indication information, which may be used to indicate whether the fifth indication information is included in the first frame.

The FDMA indication may be located in the CT field in the first frame. The FDMA indication information may occupy at least one bit. Taking a bit as an example, if the value of the bit corresponding to the FDMA indicating information is 1, the FDMA indicating information may be used to indicate that the fifth indicating information is included in the first frame; if the value of the bit corresponding to the FDMA indicator is 2, the FDMA indicator may be used to indicate that the fifth indicator is not included in the first frame.

Optionally, replying, by each responding node, at least the second frame may include: the primary channel, i.e. each responding node on the primary channel, needs to force the reply to the second frame.

As follows, the present embodiment can also explain any of the above-described methods by two examples.

Fig. 5 is a flowchart of a method for transmitting a single channel by an initiating node and a responding node in an information transmission method according to an embodiment of the present application. As shown in fig. 5, the originating node may transmit 3 identical first frames to three responding nodes in MU-MIMO manner on a high frequency channel.

If the three response nodes are respectively located in the coverage areas of the initiating node in different sending directions, the initiating node sends a first frame to the response node 1 by adopting a first sending beam, sends the first frame to the response node 2 by adopting a second sending beam, and sends the first frame to the response node by adopting a third sending beam. Each first frame has a CT field, and the CT field of each first frame may include: the identities of the three responding nodes or the EDMG GroupID where the three responding nodes are located. Each first frame may be a DMG CTS-to-self, RTS, or MU-RTS frame, etc.

The CT field of the first frame as shown above may include: at least one indication information. The first indication information is used for indicating whether each response node needs to reply to the second frame; the second indication information is used for indicating whether the type of the second frame replied by each responding node is a CTS frame or a DMG CTS frame; the third indication information is used for indicating the value of the TA in the second frame of each responding node indication reply; the fourth indication information is used for indicating whether the mode of replying the second frame by each responding node is a serial replying mode or a simultaneous replying mode.

The response node 1 may return a second frame to the originating node by using a first transmission beam on the high frequency channel after receiving a preset time interval after the first frame, such as a short InterFrame Space (short InterFrame Space) or a preset InterFrame Space (X InterFrame Space); the responding node 2 may return the second frame to the initiating node by using the second transmission beam on the high-frequency channel after receiving the preset time interval after the first frame; the responding node 3 may return the second frame to the initiating node on the high frequency channel using the third transmission beam after receiving the first frame for a preset time interval. The responding node 1, the responding node 2 and the responding node 3 return a second frame to the initiating node at the same time. The second frame is a CTS frame or a DMG CTS frame. And if the second frame is a DMG CTS frame, the TA in the second frame returned by the different responding nodes is the same. Whether the second frame is a CTS frame or a DMG CTS frame, the scrambling initialization values in the second frames returned by different responding nodes are the same.

It should be noted that, before replying the second frame, each responding node needs to perform channel idle estimation on the reply channel first, and if the reply channel is in an idle state, the responding node returns the second frame to the initiating node on the reply channel.

After receiving the second frame returned by the three responding nodes, the initiating node can realize channel protection in a multi-user scene on a high-frequency channel, so that after the responding node 3 returns the second frame, the initiating node can perform multi-user Physical layer Protocol Data Unit transmission and reception (MU-Physical Protocol Data Unit transmission and reception) with the three responding nodes.

Fig. 6 is a flowchart of a method for transmitting multi-channel information by an initiating node and a responding node in an information transmission method according to an embodiment of the present application. As shown in fig. 6, the initiating node may send 3 identical first frames to three responding nodes in MU-MIMO manner on channel 1 and channel 2. Channel 1 and channel 2 may both be high frequency channels.

If the three response nodes are respectively located in the coverage areas of the initiating node in different sending directions, the initiating node respectively sends a first frame to the response node 1 on the channel 1 and the channel 2 by adopting a first sending beam, respectively sends a first frame to the response node 2 on the channel 1 and the channel 2 by adopting a second sending beam, and respectively sends a first frame to the response node 3 on the channel 1 and the channel 2 by adopting a third sending beam. Each first frame has a CT field, and the CT field of each first frame may include: the identities of the three responding nodes or the EDMG GroupID where the three responding nodes are located. Each first frame may be a DMG CTS-to-self, RTS, or MU-RTS frame, etc.

The CT field of the first frame as shown above may include: at least one indication information. The first indication information is used for indicating whether each response node needs to reply to the second frame; the second indication information is used for indicating whether the type of the second frame replied by each responding node is a CTS frame or a DMG CTS frame; the third indication information is used for indicating the value of the TA in the second frame of each response node indication reply; the fourth indication information is used for indicating whether the mode of replying the second frame by each response node is a serial reply mode or a simultaneous reply mode; the fifth indication information is used to indicate a channel for each responding node to reply to the second frame.

The responding node 1 may return a second frame to the initiating node on the channel 1 by using the first transmission beam after receiving a preset time interval, such as SIFS or XIFS, after receiving the first frame; the responding node 2 may return the second frame to the initiating node by using the second transmission beam on the channel 2 after receiving the preset time interval after the first frame; the responding node 3 may return the second frame to the initiating node on channel 1 and channel 2 using the third transmit beam after receiving the first frame for a preset time interval. The responding node 1, the responding node 2 and the responding node 3 may return a second frame to the originating node at the same time. The second frame is a CTS frame or a DMG CTS frame. And if the second frame is a DMG CTS frame, the TA in the second frame returned by the different responding nodes is the same. Whether the second frame is a CTS frame or a DMG CTS frame, the scrambling initialization values in the second frames returned by different responding nodes are the same.

After receiving the second frame returned by the three responding nodes, the initiating node can realize channel protection in a multi-user scene on a multi-channel, so that after the responding node 3 returns the second frame, the initiating node can perform multi-user physical layer protocol data unit sending and receiving with the three responding nodes.

The information transmission method provided by the application can effectively shorten the time of carrying out the channel protection process between the initiating node and the responding node in a high-frequency single-channel multi-user transmission scene, and can also shorten the time of carrying out the channel protection process between the initiating node and the responding node in a high-frequency multi-channel multi-user transmission scene; and the second frames returned by different response nodes are the same, so that the information robustness in the channel protection process on a high-frequency single channel or a high-frequency multi-channel is effectively improved, the decoding complexity of the initiating node for the second frames is also reduced, and the accuracy of the decoded information is ensured. It should be understood that the communication node described in this embodiment may be used as an initiating node, and has any function of the initiating node described in the foregoing method. Fig. 7 is a first schematic structural diagram of a communication node according to an embodiment of the present application. As shown in fig. 7, a communication node 700 may comprise:

A processing module 701, configured to control sending a first frame to multiple response nodes and control receiving a second frame returned by the multiple response nodes at the same time, where the second frames returned by different response nodes are the same;

a sending module 702, configured to send the first frame to the plurality of response sections;

the receiving module 703 receives the second frame returned by the plurality of responding nodes at the same time.

Optionally, as shown above, the communication node 700 may further cooperate with the processing module 701, the sending module 702, and the receiving module 703 to execute any other information transmission method executed by the initiating node.

The communication node provided in the embodiment of the present application may execute any of the above-described information transmission methods executed by the initiating node, and specific implementation processes and beneficial effects thereof are referred to above, and are not described herein again.

It should be understood that the communication node described in this embodiment may be used as a response node, and has any function of the response node described in the foregoing method. Fig. 8 is a first schematic structural diagram of another communication node according to an embodiment of the present application. As shown in fig. 8, a communication node 800 includes:

the processing module 801 is configured to control to receive a first frame sent by an initiating node, and control to return a second frame to the initiating node simultaneously with other responding nodes, where the second frames returned by different responding nodes are the same.

A receiving module 802, configured to receive a first frame sent by the initiating node;

a sending module 803, configured to return the second frame to the initiating node simultaneously with other responding nodes.

Optionally, the communication node 800 shown above may further cooperate with the processing module 801, the receiving module 802, and the sending module 803 to execute any other information transmission method executed by the responding node.

The communication node provided in the embodiment of the present application may execute the information transmission method executed by any one of the response nodes described above, and the specific implementation process and beneficial effects thereof are referred to above, and are not described herein again.

The embodiment of the application also provides a communication node. Fig. 9 is a schematic structural diagram of a communication node according to an embodiment of the present application. It should be understood that the communication node described in this embodiment may be used as an originating node, which has any of the functions of the originating node described in the above method. As shown in fig. 9, the communication node 900 may include: a processor 901, a transmitter 902 and a receiver 903. The transmitter 902 and the receiver 903 are each connected to the processor 901.

The processor 901 is configured to control sending a first frame to multiple responding nodes, and control receiving a second frame returned by the multiple responding nodes at the same time, where the second frames returned by different responding nodes are the same.

A transmitter 902 configured to transmit the first frame to the plurality of response sections.

And a receiver 903, configured to receive a second frame returned by the multiple responding nodes at the same time.

Optionally, the communication node 900 shown above may further cooperate with the processor 901, the transmitter 902 and the receiver 903 to execute any other information transmission method executed by the initiating node.

Optionally, an embodiment of the present application further provides a computer program product including instructions, where the computer program product includes a program code for executing any of the information transmission methods executed by the initiating node.

Optionally, an embodiment of the present application further provides a computer-readable storage medium. The storage medium is for storing a computer program product, the computer program product comprising: program code. The program code may include program code for performing any of the above-described information transfer methods performed by an originating node.

The computer-readable storage medium may be an internal memory in the communication node 900 shown in fig. 9 or an external memory connected to the communication node 900.

The program code in the computer program product may be executable by a processor 901 in a communication node 900 as described above in connection with fig. 9, for example, to control a transmitter 902 and a receiver 903 to cooperate in performing any of the information transfer methods described above as being performed by an originating node.

The functions of the computer program product may be implemented by hardware or software, and when implemented by software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable storage medium.

The communication node, the computer-readable storage medium, and the computer program product according to the embodiments of the present application may execute any one of the above-described information transmission methods executed by the initiating node, and specific implementation processes and beneficial effects thereof are described above and will not be described herein again.

The embodiment of the application also provides a communication node. Fig. 10 is a schematic structural diagram of another communication node according to an embodiment of the present application. It should be understood that the communication node described in this embodiment may be used as a responding node, which has any of the functions of the responding node described in the above method. As shown in fig. 10, the communication node 1000 includes: a processor 1001, a receiver 1002, and a transmitter 1003. The receiver 1002 and the transmitter 1003 are respectively connected to the processor 1001.

The processor 1001 is configured to control to receive a first frame sent by an initiating node, and control to return a second frame to the initiating node simultaneously with other responding nodes, where the second frames returned by different responding nodes are the same.

A receiver 1002, configured to receive a first frame sent by the initiating node.

And a sender 1003, configured to return the second frame to the initiating node simultaneously with other responding nodes.

Optionally, the communications node 1000 shown above may also cooperate with the processor 1001, the receiver 1002 and the transmitter 1003 to perform any other information transmission method performed by the responding node.

Optionally, an embodiment of the present application further provides a computer program product including instructions, where the computer program product includes a program code for executing the information transmission method executed by any one of the response nodes described above.

Optionally, an embodiment of the present application further provides a computer-readable storage medium. The storage medium is for storing a computer program product, the computer program product comprising: program code. The program code may include program code for performing any of the above-described information transmission methods performed by a responding node.

The computer-readable storage medium may be an internal memory in the communication node 1000 shown in fig. 10 or an external memory connected to the communication node 1000.

The program code in the computer program product may be executed by the processor 1001 in the communications node 100 shown in fig. 10, for example, to control the receiver 1002 and the transmitter 1003 to cooperate to perform any of the information transmission methods performed by the responding node shown in the above description.

The functions of the computer program product may be implemented in hardware or software, and when implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable storage medium.

The communication node, the computer-readable storage medium, and the computer program product according to the embodiments of the present application may execute any one of the above-described information transmission methods executed by the response node, and specific implementation processes and beneficial effects thereof are described above and will not be described herein again.

It should be noted that, in the above embodiments, all or part of the implementation may be realized by software, hardware, firmware or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

Claims

1. An information transmission method, comprising:

the initiating node sends a first frame to a plurality of responding nodes on a high-frequency channel by adopting a multi-user multi-input multi-output MU-MIMO mode;

the initiating node receives directional multi-gigabit allowed sending DMG CTS frames which are simultaneously returned by the multiple responding nodes in a single-input single-output SISO mode on the high-frequency channel, the DMG CTS frames returned by different responding nodes are the same, and the DMG CTS frames returned by different responding nodes comprise: the same scrambling initialization value and the same sending address TA; the same scrambling initialization value is the same as the scrambling initialization value included in the first frame, and the same TA is a broadcast address.

2. The method of claim 1, wherein the initiating node sends a first frame to a plurality of responding nodes, comprising:

the initiating node transmitting the first frame to the plurality of responding nodes on a plurality of channels;

the initiating node receives second frames returned by the multiple responding nodes at the same time, and the second frames returned by different responding nodes are the same, including:

and the initiating node receives second frames returned by the plurality of responding nodes on a plurality of channels simultaneously, and the second frames returned by different responding nodes are the same.

3. An information transmission method, comprising;

a response node receives a first frame sent by an initiating node on a high-frequency channel in a multi-user multi-input multi-output MU-MIMO mode;

the response node and other response nodes adopt a single-input single-output SISO mode to simultaneously return a second frame to the initiating node on the high-frequency channel, the second frames returned by different response nodes are the same, and the second frames returned by different response nodes comprise: the same scrambling initialization value and the same sending address TA; the second frame is a directional multi-gigabit clear to send (DMG CTS) frame, the same scrambling initialization value is the same as the scrambling initialization value included in the first frame, and the same TA is a broadcast address.

4. The method of claim 3, wherein receiving, by the responding node, the first frame sent by the initiating node comprises:

the responding node receives the first frame sent by the initiating node on a plurality of channels;

the responding node and other responding nodes return a second frame to the initiating node at the same time, and the second frames returned by different responding nodes are the same, including:

and the responding node and other responding nodes return a second frame to the initiating node on a plurality of channels simultaneously, and the second frames returned by different responding nodes are the same.

5. A communications node, comprising: a processor, a transmitter and a receiver; the transmitter and the receiver are respectively connected with the processor;

the processor is configured to control to transmit a first frame on a high-frequency channel to a plurality of responding nodes in a multi-user multi-input multi-output MU-MIMO manner, and control to receive a second frame returned by the plurality of responding nodes on the high-frequency channel simultaneously in a single-input single-output SISO manner, where second frames returned by different responding nodes are the same, and second frames returned by different responding nodes include: the same scrambling initialization value and the same sending address TA; the second frame is a directional multi-gigabit clear to send (DMG CTS) frame, the same scrambling initialization value is the same as the scrambling initialization value included in the first frame, and the same TA is a broadcast address;

the transmitter, configured to transmit the first frame to the plurality of response sections;

and the receiver is used for receiving a second frame returned by the plurality of responding nodes at the same time.

6. A communications node, comprising; a processor, a receiver, and a transmitter; the receiver and the transmitter are respectively connected with the processor;

The processor is configured to control the receiving initiating node to receive a first frame sent by the initiating node on the high-frequency channel in a multi-user multi-input multi-output MU-MIMO manner, and control the receiving initiating node to return a second frame to the initiating node on the high-frequency channel simultaneously in a single-input single-output SISO manner with other responding nodes, where the second frames returned by different responding nodes are the same, and the second frames returned by different responding nodes include: the same scrambling initialization value and the same sending address TA; the second frame is a directional multi-gigabit clear to send (DMG CTS) frame, the same scrambling initialization value is the same as the scrambling initialization value included in the first frame, and the same TA is a broadcast address;

the receiver is configured to receive a first frame sent by the initiating node;

the sender is used for returning a second frame to the initiating node simultaneously with other responding nodes; the second frame is a DMG CTS frame allowed to be sent by directional multi-gigabit bits or a DMG DTS frame refused to be sent by the directional multi-gigabit bits.