CN111770541B - Key frame sending method and device, storage medium and terminal - Google Patents

Abstract

A key frame sending method and device, a storage medium and a terminal are provided, wherein the key frame sending method comprises the following steps: determining the time to be sent of a key frame, and detecting the sending state of the key frame; if the key frame is not sent out within a preset time length after the moment to be sent, detecting the data receiving state of the current equipment; and interrupting TXOP (transmission opportunity) of other equipment at the current moment according to the data receiving state, and competing a channel to send the key frame. The technical scheme of the invention can realize the timely transmission of the key frame and ensure the timely switching of the RF resources.

Description

Key frame sending method and device, storage medium and terminal

technical field

The present invention relates to the field of communication technologies, and in particular, to a key frame sending method and device, a storage medium and a terminal.

Background technique

In a WiFi and Bluetooth (Blue Tooth, BT) coexistence scenario, or a WiFi multi-identity coexistence scenario (such as STA link AP + WiFi direct connection coexistence), time-sharing handover of radio frequency (RF) resources will be involved. In order to ensure that time-sharing handover does not affect WiFi services, some key frames are sent (for example, PM1 NULL frame notifies the peer to go to sleep or CTS2SELF frame occupies the channel).

However, the existing solution can only passively wait for the channel to be idle before sending the key frame. If the third-party device occupies the air interface for a long time (for example, the time specified by the WiFi protocol is not followed), the key frame cannot be sent in time, and the RF resources will not be sent in time. Failure to switch in time will affect WiFi or BT services; it may even cause key frames to fail to be sent. If key frames are not sent, RF resource switching will be performed, which will affect WiFi services.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is how to realize timely transmission of key frames and ensure timely switching of RF resources.

In order to solve the above technical problem, an embodiment of the present invention provides a method for sending a key frame. The method for sending a key frame includes: determining the time to be sent of the key frame, and detecting the sending state of the key frame; if the key frame is sent after the time to be sent If the key frame is not sent out within the preset time period, the current data receiving state of the device is detected; the TXOP of other devices at the current moment is interrupted according to the data receiving state, and the key frame is sent by competing channels.

Optionally, the interrupting the TXOP of other devices at the current moment according to the data receiving state includes: when the data receiving state is not in the packet receiving state, directly contending for a channel; if a confirmation frame needs to be replied during the contention for the channel, Then do not reply to the confirmation frame and continue to contend for the channel.

Optionally, the interrupting the TXOP of other devices at the current moment according to the data receiving state includes: when the data receiving state is not in the packet receiving state, directly contending for a channel; if a confirmation frame needs to be replied during the contention for the channel, Then, the key frame is sent directly at the moment when the confirmation frame needs to be replied; or, if it is detected that the CCA is busy during the contention channel period, the data receiving state is continued to be detected.

Optionally, the interrupting the TXOP of other devices at the current moment according to the data receiving state includes: when the data receiving state is in the packet receiving state, detecting whether the received data is sent to the current device; If the received data is sent to the current device, it does not reply to the confirmation frame and competes for the channel to send the key frame; or, if the received data is sent to the current device, it directly responds to the confirmation frame when it is needed. The key frame is sent at the moment.

Optionally, the interrupting the TXOP of other devices at the current moment according to the data receiving state includes: if the data receiving state is in a packet receiving state, detecting whether the received data is sent to the current device; If the received data is not sent to the current device or it cannot be determined that the received data is sent to the current device, an interference signal is sent; the contention channel sends the key frame.

Optionally, the sending the interference signal includes: after detecting that the current channel is idle for a set duration, sending the interference signal; or, when the received data is an acknowledgment frame, directly sending the interference signal.

Optionally, the key frame is a frame that needs to be acknowledged, and the method further includes: if an acknowledgement frame for the frame that needs to be acknowledged is not received, continuing to send the interference signal.

Optionally, the detecting the sending state of the key frame includes: starting a timer at the to-be-sent moment, and detecting the sending state of the key frame within the time duration of the timer, and the timer The timing duration is the preset duration.

In order to solve the above technical problem, an embodiment of the present invention further discloses a key frame sending device, the key frame sending device includes: a time-to-be-sent time determining module for determining the time-to-be-sent time of the key frame, and detecting the sending of the key frame The data receiving state detection module is used to detect the data receiving state of the current device if the key frame is not sent within the preset time period after the to-be-sent time; the key frame sending module, using The TXOP of other devices at the current moment is interrupted according to the data receiving state, and the key frame is sent on a competing channel.

The embodiment of the present invention also discloses a storage medium, on which a computer program is stored, and the computer program executes the steps of the key frame sending method when the computer program is run by a processor.

An embodiment of the present invention further discloses a terminal, including a memory and a processor, the memory stores a computer program that can be run on the processor, and the processor executes the key frame when running the computer program The steps of the sending method.

Compared with the prior art, the technical solutions of the embodiments of the present invention have the following beneficial effects:

In the technical scheme of the present invention, the time to be sent of the key frame is determined, and the transmission state of the key frame is detected; if the key frame is not sent within a preset time period after the time to be sent, the radio frequency is determined. The resource is occupied; the current data receiving state of the device is detected; the transmission opportunity (TXOP) at the current moment is interrupted according to the data receiving state, and the key frame is sent by competing for a channel. The technical scheme of the present invention can interrupt the TXOP of other devices at the current moment based on the current data receiving state when it is detected that the radio frequency resource is occupied, that is, the air interface is occupied, so as to be able to compete for the channel to send the key frame, and ensure that the key frame is timed out. If it is not sent, it will be sent in time to realize the timely switching of RF resources and ensure the normal execution of the WIFI service or BT service of the current device.

Further, when the data receiving state is not in the state of receiving packets, the channel is directly contended; if the confirmation frame needs to be replied during the contention of the channel, the confirmation frame is not returned and the contention for the channel is continued, or directly when the confirmation frame needs to be returned. The key frame is sent. The technical solution of the present invention can destroy the TXOP of the opposite end device by not replying to the confirmation frame or sending the key frame when the confirmation frame needs to be returned, so that the key frame can be sent through the competition channel or the key frame can be sent directly.

Further, if the data receiving state is in the receiving state, it is detected whether the received data is sent to the current device; if the received data is not sent to the current device or it cannot be determined that the received data is sent For the current device, the interference signal is sent; the contention channel sends the key frame. The technical scheme of the present invention interrupts the transmission TXOP of other devices by sending an interference frame or interference signal, and transmits the key frame by competing with other devices for the air interface.

Description of drawings

1 is a flowchart of a method for sending a key frame according to an embodiment of the present invention;

FIG. 2 is a flowchart of a specific implementation of step S103 shown in FIG. 1;

3 and 4 are schematic diagrams of a specific application scenario of an embodiment of the present invention;

FIG. 5 is a flowchart of another specific implementation of step S103 shown in FIG. 1;

6 is a schematic diagram of another specific application scenario of an embodiment of the present invention;

FIG. 7 is a flowchart of another specific implementation manner of step S103 shown in FIG. 1;

8-10 are schematic diagrams of another specific application scenario of an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of an apparatus for sending a key frame according to an embodiment of the present invention.

Detailed ways

As described in the Background Art, the existing solution can only passively wait for the channel to be idle before sending the key frame. If the third-party device occupies the air interface for a long time (for example, the time specified by the WiFi protocol is not followed), the key frame cannot be sent in time. , then RF resources cannot be switched in time, affecting WiFi or BT services; it may even cause key frames to fail to be sent, and RF resource switching will be performed without key frames being sent, which will affect WiFi services.

The technical scheme of the present invention can interrupt the TXOP of other devices at the current moment based on the current data receiving state when it is detected that the radio frequency resource is occupied, that is, the air interface is occupied, so as to be able to compete for the channel to send the key frame, and ensure that the key frame is timed out. If it is not sent, it will be sent in time to realize the timely switching of RF resources and ensure the normal execution of the WIFI service or BT service of the current device.

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a flowchart of a method for sending a key frame according to an embodiment of the present invention.

The key frame sending method can be used on the terminal device side, and the terminal device can support WIFI service, or support WIFI service and BT service at the same time.

The key frame sending method may specifically include the following steps:

Step S101: determine the time to be sent of the key frame, and detect the sending state of the key frame;

Step S102: if the key frame is not sent out within a preset time period after the to-be-sent time, detect the data receiving state of the current device;

Step S103: Interrupt the TXOP of other devices at the current moment according to the data receiving state, and compete for a channel to send the key frame.

It should be noted that the sequence numbers of the steps in this embodiment do not represent limitations on the execution order of the steps.

For scenarios involving time-sharing switching of RF resources, such as WiFi and BT need to work at the same time, or the coexistence of multiple WiFi identities, the switching time of RF resources can be preset, and accordingly, the transmission time of key frames is also preset. OK Among them, the WiFi multi-identity may refer to the connection of the router as a STA to connect directly with other devices via WiFi, and to share the network as a SoftAp (hotspot). Therefore, dynamic switching of RF resources is required.

Before switching the RF resource, you need to notify the device associated with it to stop communicating with it, otherwise the other device will keep sending packets and cause packet loss. The role of the keyframe is to notify the device associated with it to stop communicating with it. If the key frame is PM1NULL frame (also known as PowerSave frame), it can notify the associated device (such as the router) to enter the sleep state, so that the router will not send data until the WiFi device sends an Active frame.

In the specific implementation of step S101, the time to be sent of the key frame can be determined according to the preset sending time sequence of the key frame, and the sending state of the key frame is detected. The transmission time sequence of the key frame may include various moments when the key frame needs to be transmitted. If it is detected that the key frame is sent out at the moment when the key frame is to be sent, steps S102-S103 are not continued. Otherwise, it is necessary to continue to monitor the sending status of key frames.

In the specific implementation of step S102, if it is detected that the key frame has not been sent out within a preset time period after the time to be sent, it can be determined that radio frequency resources are occupied, and intervention measures need to be taken to enable the key frame to be sent out.

In a specific embodiment, a timer may be started at the to-be-sent moment, and the sending state of the key frame may be detected within the timing duration of the timer, where the timing duration of the timer is the preset duration duration.

In this embodiment, a timer is set to set the time length that needs to be detected for the sending state of the key frame. Specifically, a timer can be started at the moment when the key frame is to be sent. After the timer expires, the key frame has not been sent, and it can be determined that the radio frequency resource is occupied, and the key frame cannot be successfully sent out because it cannot compete for the channel. In this case, steps S102 to S103 can be continued.

In the specific implementation of step S102 and step S103, when the timer expires, the data receiving state of the current device is detected, and the TXOP of other devices at the current moment is interrupted according to the data receiving state, and the competition channel sends the data. Keyframe. In this embodiment, only in the case of interrupting the TXOP of other devices at the current moment, it can be ensured that the key frame can successfully compete for the channel and be sent out.

Specifically, the data receiving state may indicate whether the current device (that is, the local machine) is receiving packets, that is, whether it is receiving data packets.

Further, when the key frame is sent through the contention channel, a point coordination interframe space (Point Coordination Function InterFrame Space, PIFS) may be used to compete for the channel. PCFIFS is 25 microseconds. That is to say, in the embodiment of the present invention, a time interval shorter than a normal channel contention time interval (usually greater than or equal to 34 microseconds) is used to compete for a channel, so as to ensure a higher success rate of channel contention.

In an optional embodiment, a short interframe space (SIFS) may also be used to contend for a channel.

In the embodiment of the present invention, when it is detected that the radio frequency resource is occupied, that is, the air interface is occupied, the TXOP of other devices at the current moment can be interrupted based on the current data receiving state, so as to be able to compete for the channel to send the key frame, so as to ensure that the key frame is timed out. If it is not sent, it will be sent in time to realize the timely switching of RF resources and ensure the normal execution of the WIFI service or BT service of the current device.

In a non-limiting embodiment of the present invention, please refer to FIG. 2 , step S103 shown in FIG. 1 may include the following steps:

Step S201: when the data receiving state is not in the packet receiving state, directly contend for a channel;

Step S202: If the confirmation frame needs to be returned during the contention of the channel, the confirmation frame is not returned and the channel contention is continued.

In this embodiment, when the data receiving state is not in the receiving state, it means that the current device may fall within the Short InterFrame Space (SIFS) within the TXOP, or may be set to a network configuration vector (NetAllocation Vector, NAV) makes it impossible to send packets, so the send frame cannot be sent out. In this case, the set NAV value can be ignored, that is, the virtual channel detection is not performed, and the key frame is directly competed for the channel.

For details, please refer to FIG. 3 together. The current device is a WiFi device, T1 is the time when the key frame is to be sent, and T2 is the timeout time, that is, the preset time after the time to be sent. T2 falls into the SIFS in the TXOP, and the WiFi device can directly use the PIFS to compete for the channel. During the use of the PIFS contention channel, the confirmation frame ACK/BA needs to be returned, then the confirmation frame is not returned and the channel competition is continued, and the key frame is sent after the competition is successful. As shown in FIG. 3 , the time interval for the devices linked by WiFi devices to re-compete for the channel is longer (ie, longer than PIFS), so that the WiFi devices can successfully compete for the channel for the key frame and send the key frame.

In a non-limiting embodiment of the present invention, step S202 shown in FIG. 2 can also be replaced with step S203: if a confirmation frame needs to be replied during the contention of the channel, the key frame is directly sent at the moment when the confirmation frame needs to be replied .

Different from the foregoing embodiments, this embodiment sends the key frame at the moment of replying to the acknowledgment frame. That is to say, when it needs to reply to the confirmation frame, the current device can send the data packet, and the current device replaces the data to be sent by the confirmation frame with the key frame. Send key frames in time.

For details, please refer to FIG. 4 together. The difference from FIG. 3 is that the WiFi device sends the key frame at the moment when it needs to reply to the acknowledgment frame ACK/BA.

In a non-limiting embodiment of the present invention, please refer to FIG. 5 , step S103 shown in FIG. 1 may include the following steps:

Step S501: when the data receiving state is in the packet receiving state, detect whether the received data is sent to the current device;

Step S502: If the received data is sent to the current device, no acknowledgement frame is returned and the key frame is sent through a competition channel.

In this embodiment, the data receiving state being in the receiving state indicates that the RF resource is receiving data packets, and the received data may or may not be sent to the current device.

In the case that the received data is sent to the current device, it means that the received data is the data sent by the peer device linked by the current device to the current device. If the current device needs to reply with an acknowledgment frame, the acknowledgment frame may not be returned to destroy the peer end. TXOP of the device, and contention channel to send the key frame.

For details, please refer to FIG. 6 , T2 is the timeout time, that is, the time of the preset duration after the time to be sent. It is detected at time T2 that the received frame is data for the local machine (that is, the WIFI device). WiFi devices can directly use the PIFS contention channel. During the use of the PIFS contention channel, the confirmation frame ACK/BA needs to be returned, then the confirmation frame is not returned and the channel competition is continued, and the key frame is sent after the competition is successful.

In an optional embodiment, step S502 shown in FIG. 5 may be replaced by step S503: if the received data is sent to the current device, the key frame is directly sent at the moment when a confirmation frame needs to be replied.

Different from the foregoing embodiments, this embodiment sends the key frame at the moment of replying to the acknowledgment frame. That is to say, when it needs to reply to the confirmation frame, the current device can send the data packet, and the current device replaces the data to be sent by the confirmation frame with the key frame. Send key frames in time.

In a non-limiting embodiment of the present invention, please refer to FIG. 7 , step S103 shown in FIG. 1 may include the following steps:

Step S701: if the data receiving state is in a packet receiving state, detect whether the received data is sent to the current device;

Step S702: if the received data is not sent to the current device or it cannot be determined that the received data is sent to the current device, send an interference signal;

Step S703: The key frame is sent on the contention channel.

In this embodiment, by sending an interference signal, the device sending data cannot receive the corresponding acknowledgment frame, so as to achieve the purpose of destroying its TXOP.

Specifically, the interference signal may be a frequency signal in any implementable form, such as a data frame, interference energy, and the like.

In a specific embodiment, step S702 may include the following specific implementation steps: after detecting that the current channel is idle for a set duration, sending the interference signal; or, when the received data is an acknowledgment frame, directly sending the the interfering signal.

Specifically, the acknowledgment frame may be a Response frame, such as a clear to send frame (Clear To Send, CTS), an ACK, a block acknowledgment frame (Block Ack, BA), and the like.

In a specific implementation, the interference signal may be sent after detecting that the channel is idle SIFS (ie, 16 microseconds). In the case where the received data is an acknowledgment frame, the jamming signal can be sent immediately in order to interrupt the TXOP in time.

Specifically, referring to FIG. 8 , the third-party device and its peer device occupy RF resources to send data. At the timeout time T2, when the WIFI device detects that the received data is not sent to the local machine, and the received data is not an acknowledgement frame (Resp frame), the WIFI device sends an interference signal (Noisy) after the SIFS of the received data frame, which interferes with third-party devices. Receive the acknowledgment frame sent by its peer device to interrupt the TXOP of the third-party device.

For details, please refer to FIG. 9. At the timeout time T2, when the WIFI device detects that the received data is not sent to the local machine, and the received data is an acknowledgement frame (Resp frame), the WIFI immediately sends an interference signal (Noisy), which interferes with the reception of the third-party device. The acknowledgment frame sent by its peer device to interrupt the TXOP of the third-party device.

In a preferred embodiment, when the key frame is a frame that needs to be acknowledged, such as PM1 NULLframe, the peer device of the current device needs to send an acknowledgement frame after receiving the frame that needs to be acknowledged. If the current device does not receive an acknowledgment frame for the frame that needs to be acknowledged, it continues to send the interference signal.

In a non-limiting embodiment, when the data receiving state is not in the packet receiving state, the channel is directly contended; if it is detected that the CCA is busy during the contention of the channel, the data receiving state is continued to be detected.

In a specific example, referring to FIG. 10 , T2 falls within the SIFS within the TXOP, and the WiFi device can directly use the PIFS contention channel. During the use of the PIFS contention channel, if the Clear Channel Assessment (CCA) is busy, it indicates that the current data receiving state is receiving packets. In this case, it is necessary to withdraw from the PIFS contention channel. Check if the received data is sent to a WiFi device. The subsequent steps are determined according to whether the received data is sent to the current device. Wherein, if the received data is sent to the current device, execute the steps of the method shown in FIG. 5; if the received data is not sent to the current device, or it cannot be determined whether the received data is sent to the current device, execute the steps shown in FIG. 7 steps of the method.

Referring to FIG. 11 , an embodiment of the present invention further discloses a key frame sending apparatus 110 . The key frame sending apparatus 110 may include a to-be-sent moment determination module 1101 , a data receiving state detection module 1102 and a key frame sending module 1103 .

Wherein, the to-be-sent time determination module 1101 is used to determine the to-be-sent time of the key frame, and to detect the transmission state of the key frame; the data reception state detection module 1102 is used to, if within a preset time period after the to-be-sent time, If the key frame has not been sent, the data receiving state of the current device is detected; the key frame sending module 1103 is used to interrupt the TXOP of other devices at the current moment according to the data receiving state, and compete for the channel to send the key frame .

In the embodiment of the present invention, when it is detected that the radio frequency resource is occupied, that is, the air interface is occupied, the TXOP of other devices at the current moment can be interrupted based on the current data receiving state, so as to be able to compete for the channel to send the key frame, so as to ensure that the key frame is timed out. If it is not sent, it will be sent in time to realize the timely switching of RF resources and ensure the normal execution of the WIFI service or BT service of the current device.

For more information on the working principle and working mode of the key frame sending apparatus 110, reference may be made to the relevant descriptions in FIG. 1 to FIG. 8, and details are not repeated here.

The embodiment of the present invention further discloses a storage medium, which is a computer-readable storage medium, and stores a computer program thereon, and the computer program can execute the steps of the foregoing key frame sending method when running. The storage medium may include ROM, RAM, magnetic or optical disks, and the like. The storage medium may also include a non-volatile memory (non-volatile) or a non-transitory (non-transitory) memory and the like.

The embodiment of the present invention further discloses a terminal device, the terminal device may include a memory and a processor, and the memory stores a computer program that can run on the processor. When the processor runs the computer program, the steps of the foregoing method for sending key frames may be executed. The terminal equipment includes but is not limited to mobile phone, computer, tablet computer and other terminal equipment.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (11)

1. A key frame transmission method, comprising:

determining a to-be-sent moment of a key frame, and detecting a sending state of the key frame, wherein the key frame is used for informing associated equipment to stop communicating with current equipment;

if the key frame is not sent out within a preset time length after the moment to be sent, detecting the data receiving state of the current equipment;

and interrupting TXOP (transmission opportunity) of other equipment at the current moment according to the data receiving state, and competing a channel to send the key frame.

2. The method of claim 1, wherein the interrupting TXOP of other devices at the current time according to the data reception status comprises:

when the data receiving state is not in a packet receiving state, directly competing for a channel;

if the acknowledgement frame needs to be replied during the competition channel, the acknowledgement frame is not replied and the competition channel is continued, or the key frame is directly sent at the moment when the acknowledgement frame needs to be replied.

3. The method of claim 1, wherein the interrupting TXOP of other devices at the current time according to the data reception status comprises:

when the data receiving state is not in a packet receiving state, directly contending for a channel;

and if CCA busy is detected in the channel competition period, the data receiving state is continuously detected, TXOP of other equipment at the current moment is interrupted according to the data receiving state, and the key frame is sent by the channel competition.

4. The method of claim 1, wherein the interrupting TXOP of other devices at the current time according to the data reception status comprises:

when the data receiving state is in a packet receiving state, detecting whether the received data is sent to the current equipment;

and if the received data is sent to the current equipment, not replying an acknowledgement frame and competing for a channel to send the key frame, or directly sending the key frame at the moment when the acknowledgement frame needs to be replied.

5. The method of claim 1, wherein the interrupting TXOP of other devices at the current time according to the data reception status comprises:

if the data receiving state is in a packet receiving state, detecting whether the received data is sent to the current equipment;

if the received data is not sent to the current equipment or the received data cannot be determined to be sent to the current equipment, sending an interference signal;

and transmitting the key frame by a contention channel.

6. The method as claimed in claim 5, wherein the transmitting the interference signal comprises:

sending the interference signal after detecting the idle set time of the current channel;

or, when the received data is an acknowledgement frame, the interference signal is directly transmitted.

7. The method as claimed in claim 5, wherein the key frame is a frame that needs to reply an acknowledgement, the method further comprising:

and if the confirmation frame aiming at the frame needing to be replied and confirmed is not received, continuously detecting the data receiving state of the current equipment, interrupting the TXOP of other equipment at the current moment according to the data receiving state, and competing for a channel to send the key frame.

8. The method according to claim 1, wherein said detecting the transmission status of the key frame comprises:

and starting a timer at the to-be-sent moment, and detecting the sending state of the key frame in the timing duration of the timer, wherein the timing duration of the timer is the preset duration.

9. A key frame transmission apparatus, comprising:

the device comprises a to-be-sent time determining module, a to-be-sent time determining module and a sending state detecting module, wherein the to-be-sent time determining module is used for determining the to-be-sent time of a key frame and detecting the sending state of the key frame, and the key frame is used for informing the associated device to stop communicating with the current device;

the data receiving state detection module is used for detecting the data receiving state of the current equipment if the key frame is not sent out within a preset time length after the moment to be sent;

and the key frame sending module is used for interrupting TXOP of other equipment at the current moment according to the data receiving state and competing a channel to send the key frame.

10. A storage medium having stored thereon a computer program for performing the steps of the key frame transmission method according to any one of claims 1 to 8 when the computer program is executed by a processor.

11. A terminal comprising a memory and a processor, said memory having stored thereon a computer program operable on said processor, wherein said processor, when executing said computer program, performs the steps of the key frame transmission method of any of claims 1 to 8.

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