WO2020108540A1

WO2020108540A1 - Data transmission method and device

Info

Publication number: WO2020108540A1
Application number: PCT/CN2019/121324
Authority: WO
Inventors: 李明; 柳帅; 居双双
Original assignee: 华为技术有限公司
Priority date: 2018-11-27
Filing date: 2019-11-27
Publication date: 2020-06-04
Also published as: CN111225418A; CN111225418B

Abstract

A data transmission method and device, which are applied to a voice call scenario, and which are used to solve the problems of communication interruptions and packet loss caused when a terminal device takes a relatively long time to switch cells. The method comprises: a first access network device receiving voice packets from a first terminal device, the first access network device being an access network device accessed by the first terminal device; the first access network device caching the voice packets in a preset cache area and successively sending the voice packets cached in the preset cache area to a second terminal device by means of a second access network device according to the time sequence in which the packets were received, wherein the second access network device is an access network device accessed by the second terminal device.

Description

Data transmission method and device

This application requires the priority of the Chinese patent application filed on November 27, 2018 in the Chinese Patent Office with the application number 201811423569.3 and the application name as "a data transmission method and device", the entire contents of which are incorporated by reference in this application .

Technical field

This application relates to the field of communication technology, and in particular, to a data transmission method and device.

Background technique

At present, when the network state is not good, the voice packet sent by the first user equipment (UE) to the second UE will greatly jitter. Currently, a jitter buffer (Jitter buffer) is set in the UE to eliminate jitter.

However, when the first UE is in a weak uplink coverage or cell handover scenario, although the second UE sets a Jitter buffer to eliminate jitter, when the handover time is greater than 60ms, packet loss may occur, resulting in an average subjective opinion score (mean opinion Score, MOS) points fell. For example, before the cell switching is performed by the first UE, when the coverage is normal, a voice packet is sent to the second UE at an interval of 20 ms. During the cell switching process of the first UE, the uplink data is interrupted, and the voice packets cannot be sent to the second UE every 20ms. The first base station to which the first UE belongs has no buffered voice packets before it can continue to be sent, and gNB2 generally does not The buffered voice packets can continue to be sent, causing the second UE to receive no data for a period of time, which has a serious impact on the MOS points, and the first UE accumulates multiple voice packets during the handover process. After the first UE completes the cell handover, the accumulated multiple voice packets are sent to the second UE in one scheduling. The Jitter Buffer size of a general UE is set to 2 to 3 voice packets, and voice packets exceeding this limit will be discarded.

However, when the second UE is in downlink weak coverage or cell handover, downlink data is interrupted, and voice packets are buffered in the PDCP buffer of the base station to which the second UE belongs, resulting in interruption of the second UE communication. Moreover, once the air interface of the second UE is restored, the voice packet buffered by the base station will be delivered to the second UE at a time. When the number of accumulated voice packets exceeds the size of Jitter Buffer, packet loss will result.

Summary of the invention

The present application provides a data transmission method and device to solve the problems of communication interruption and packet loss caused by a long cell switching time of a terminal device.

In the first aspect, the present application provides a data transmission method. The method is applied in a voice call scenario. The method can be applied to a first access network device, or a chip of a first access network device, or a first access The chipset of the network device, or the functional module that executes the method in the chip of the first access network device, or other modules that can be used to implement the method, and so on. Taking the method applied to the first access network device as an example for illustration, the method includes: the first access network device receives a voice packet from a first terminal device, and the first access network device is the first terminal device Access network equipment for access. The first access network device caches the voice packet in a preset buffer area, and sequentially sends the voice packets buffered in the preset buffer area to the second through the second access network device according to the chronological order of reception Terminal device, the second access network device is an access network device accessed by the second terminal device.

In the embodiment of the present application, during the data transmission process, the first access network device may cache the voice packet sent by the first terminal device in a preset buffer area, and then send it to the second access network device in sequence. When the network connection between the first terminal device and the first access network device is interrupted, the first access network device may send the voice packet buffered in the preset buffer area to the second access network device, so that the second terminal device During the handover of the first terminal device, a voice packet may also be received, thereby reducing the interruption of the voice of the second terminal device. In addition, when the network connection between the first terminal device and the first access network device is restored, the first access network device first buffers the voice packet accumulated in the first terminal device during the interruption period in the preset buffer area , And then send it to the second access network device in sequence. Compared with the prior art, the first access network device sends all the voice packets accumulated by the first terminal device during the interruption to the second terminal device in one transmission process, The embodiment of the present application can avoid the phenomenon of packet loss caused by too many voice packets received by the second terminal device to a certain extent.

In addition, according to the data transmission method provided by the embodiment of the present application, when the network connection between the second terminal device and the second access network device is interrupted, the voice packet sent by the first terminal device to the second terminal device is first buffered in the first In the preset buffer area of an access network device, the first access network device sequentially sends to the second access network device, as compared with the prior art, the first access network device directly sends all to the second access Network device. In the embodiment of the present application, during the interruption of the network connection between the second terminal device and the second access network device, the first access network device may actively buffer the voice packets sent by the first terminal device, thereby reducing the number of The number of voice packets accumulated by the second access network device during the interruption, to a certain extent, can avoid the phenomenon of packet loss caused by the second terminal device due to too many voice packets received at one time.

In a possible design, the voice packet may include a first voice packet and a second voice packet, and the first access network device receiving the voice packet from the first terminal device includes: the first access network The device sequentially receives the first voice packet and the second voice packet from the first terminal device. Then, the first access network device sequentially sends the voice packets buffered in the preset buffer area to the second terminal device through the second access network device according to the received time sequence, including: the first access network The device sequentially sends the first voice packet and the second voice packet to the second terminal device through the second access network device. In the above design, the first access network sequentially sends the first voice packet and the second voice packet to the second terminal device according to the chronological order of reception, so that the continuity of the voice call can be maintained, thereby improving the call quality.

In a possible design, after the first access network device sends the first voice packet, when the time that the second voice packet is buffered in the preset buffer area exceeds a preset threshold, Then, the first access network device may send the second voice packet to the second terminal device through the second access network device. In the above design, the first access network device sends a second voice packet when the time that the second voice packet is buffered in the preset buffer area exceeds a preset threshold, so that the second voice packet is stored in the preset buffer The buffering time in the area will not be too long, so that the situation that the second terminal device cannot receive the second voice packet for a long time can be avoided, and the call quality can be improved.

In a possible design, the first access network device may start a first timer corresponding to the second voice packet when receiving the second voice packet, and the first timer is used to record the second voice The time during which the packet is cached in the preset cache area. When the second timer expires, the first access network device may determine that the time during which the second voice packet is buffered in the preset buffer area exceeds a preset threshold. In the above design, the first access network device uses a first timer to record the time that the second voice packet is buffered in the preset buffer area, and can monitor the time that the second voice packet is buffered in the preset buffer area, thereby The situation that the second terminal device cannot receive the second voice packet for a long time can be avoided, and thus the call quality can be improved.

In a possible design, after the first access network device sends the first voice packet, when the number of voice packets buffered in the preset buffer area is greater than a preset value, the first access The network device may send the second voice packet to the second terminal device through the second access network device. In the above design, the first access network device sends a second voice packet when the number of voice packets buffered in the preset buffer area is greater than a preset value, which can avoid the overflow of voice packets in the preset buffer area.

In a possible design, after the first access network device sends the first voice packet, the first access network device may send the first voice packet to the second terminal device through the second access network device. Describe the second voice packet. In the above design, the first access network device can reduce the jitter of the voice packet received by the second terminal device by controlling the interval between the first voice packet and the second voice packet, thereby improving the call quality.

In a possible design, the first access network device may start a first timer after sending the first voice packet, and the duration of the first timer is equal to the first preset duration. Therefore, the access network device may send the second voice packet to the second terminal device when the first timer expires.

In a possible design, if the second voice packet is a voice frame, the first preset duration may be equal to the first preset value. If the second voice packet is a silent frame, the first preset duration is equal to the second preset value. In the above design, since the voice frame carries the call data and the silent frame does not carry the call data, the different preset durations for the voice frame and the silent frame are helpful to improve the utilization rate of transmission resources.

In a possible design, after the first access network device receives the first voice packet from the first terminal device, the method may further include: the first access network device sends the first voice packet The packet is sent after being delayed for a second preset duration, and the second preset duration meets the following formula:

0≤T≤t1-t2.

Wherein, T is the second preset duration, t1 is the maximum voice packet transmission delay accepted by the second terminal device; and t2 is the voice packet transmission from the first access network device to The average duration required by the second terminal device. In the above design, by delaying the transmission of the voice packet, the number of voice packets buffered in the preset buffer area of the first access network device can be increased. For example, after the voice packet is delayed by 100 ms, the first access network The device may cache the 5 voice packets received during the 100 ms in a preset buffer area, so that the preset buffer area of the first access network device adds at least 5 voice packets. Therefore, when the network connection between the first terminal device and the first access network device is interrupted, the first access network device may have more voice packets that can be sent to the second terminal device, so the second terminal device is in the first During the interruption of the network connection between the terminal device and the first access network device, voice packets can also be continuously received, thereby reducing the voice terminal situation and improving the MOS score.

In addition, by delaying the transmission of the first voice packet, the first access network device can buffer a larger number of voice packets, thereby ensuring to a certain extent that the next voice packet has been cached when a certain voice packet is sent, Furthermore, it can be ensured that the two voice packets can be sent according to the preset sending interval. Therefore, delaying the sending of the first voice packet can better control the interval of sending the voice packets, thereby reducing the voice packets received by the second terminal device Jitter, which in turn improves MOS points. For example, taking the sending interval of 20 ms as an example, if the first voice packet is not delayed, the first access network device may not receive the next voice packet within 20 ms after sending a certain voice packet Therefore, the two voice packets cannot be sent according to the sending interval of 20ms, and the method of delaying the sending of the first voice packet by 100ms can make the preset buffer area of the first access network device send the first The next 5 voice packets can be cached for each voice packet. Since the first voice packet is delayed to be sent, the subsequent voice packets must be delayed by 100ms accordingly. Therefore, the first access network device can cache this voice packet when sending a certain voice packet Five voice packets behind the voice packet, so that after the voice packet is sent, the next voice packet can be sent at an interval of 20 ms.

In a second aspect, the present application provides a data transmission method, which is applied in a voice call scenario, and the method can be applied to a second access network device, or a chip of a second access network device, or a second access The chip set of the network device, or the functional module that executes the method in the chip of the second access network device, or other modules that can be used to implement the method, and so on. Taking the method applied to the second access network device as an example for illustration, the method includes: the second access network device sequentially receives voice packets from the first terminal device through the first access network device, and the first access network The device is an access network device accessed by the first terminal device, and the second access network device is an access network device accessed by the second terminal device. The second access network device caches the voice packet. The second access network device sends a buffered voice packet to the second terminal device according to a preset time interval at a predetermined time interval in the received time sequence. Compared with the prior art, when the network connection between the second access network device and the second terminal device is restored, the second access network sends multiple voice packets to the second terminal device at a time, resulting in the second terminal device The number of voice packets received exceeds the size of the Jitter buffer, resulting in packet loss. In the embodiment of the present application, when the network connection between the second access network device and the second terminal device is restored, the second access network device may send the buffered voice packets to the second terminal device one by one, so that The problem of packet loss caused by too many voice packets received by the second terminal device at a time is avoided, and MOS points can be improved.

In a possible design, if the voice packet is a voice frame, the first preset duration may be equal to the first preset value. If the voice packet is a silent frame, the first preset duration may be equal to the second preset value. In the above design, since the voice frame carries the call data and the silent frame does not carry the call data, the different preset durations for the voice frame and the silent frame are helpful to improve the utilization rate of transmission resources.

In a third aspect, the present application provides a data transmission method. The method is applied in a voice call scenario. The method can be applied to a source access network device, or a chip of a source access network device, or a source access network device. A chipset, or a functional module that executes the method in a chip of a source access network device, or other modules that can be used to implement the method, and so on. Taking the method applied to the source access network device as an example for illustration, the method includes: the source access network device determines that the terminal device is about to switch. Before sending a handover command to the terminal device, the source access network device sends N voice packets to the terminal device in one scheduling, where N is an integer, and 0<N≤M, where M is The maximum number of voice packets buffered in the debounce buffer area of the terminal device. Compared with the prior art, the source access network forwards all the buffered voice packets to the target access network device, and after the terminal device switches to the target access network device, the target access network device sends to the target access network device in a single schedule Terminal Equipment. In the embodiment of the present application, the source access network device sends multiple voice packets to the terminal device before the handover, so that the terminal device can process the multiple voice packets during the handover, thereby reducing the voice call process to a certain extent The interruption time of the terminal device can even avoid the interruption of the voice call when the switching time of the terminal device is relatively short, so the quality of the call can be improved to a certain extent.

In a possible design, if the number of voice packets buffered in the source access network device is greater than the M, the N is equal to the M, and the N voice packets are the source access The first M voice packets in the order of receiving voice packets have been buffered in the network device. In the above design, the source access network device sends a part of the buffered voice packet to the terminal device before the handover, so that the terminal device can process the part of the voice packet during the handover, thereby reducing interruption during the voice call to a certain extent Time, when the switching time of the terminal device is relatively short, it can even avoid the interruption of the voice call, so the call quality can be improved to a certain extent. Moreover, the source access network device sends a part of the buffered voice packets to the terminal device before the handover, so that the number of voice packets sent by the target access network device to the terminal device is reduced, thereby avoiding the second terminal device receiving in one scheduling Too many voice packets cause packet loss, which can improve call quality. In addition, the number of voice packets sent by the source access network device before the terminal device is switched is less than the maximum number of voice packets buffered in the debounce buffer area of the terminal device, which can avoid the situation that the terminal device receives too many voice packets at a time and causes packet loss .

In a possible design, if the number of buffered voice packets in the source access network device is not greater than the M, the N voice packets are buffered voice packets in the source access network device . In the above design, the source access network device sends the buffered voice packets to the terminal device before the handover, so that the terminal device can process the multiple voice packets during the handover, thereby reducing interruption during the voice call to a certain extent Time, when the switching time of the terminal device is relatively short, it can even avoid the interruption of the voice call, so the call quality can be improved to a certain extent.

In a possible design, the source access network device may also forward other voice packets in the buffered voice packets except the first M voice packets to the target access network device.

In a possible design, the source access network device may receive a measurement report sent by the terminal device, and determine that the terminal device is about to perform handover based on the measurement report.

In a possible design, the source access network device may also determine that the terminal device is about to switch based on the load of the source access network device.

According to a fourth aspect, the present application provides an apparatus, which may be an access network device or a chip. The device has the function of implementing any of the embodiments of the first aspect, the second aspect, or the third aspect. This function can be realized by hardware, and can also be realized by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In a fifth aspect, an apparatus is provided, including: a processor, a communication interface, and a memory. The communication interface is used to transfer messages and/or data between the device and other devices. The memory is used to store computer-executed instructions. When the device is running, the processor executes the computer-executed instructions stored in the memory to cause the device to perform data transmission as described in the first aspect or any one of the first aspects The method, or the data transmission method described in the second aspect or any of the second aspect, or the data transmission method described in the third aspect or the third aspect.

According to a sixth aspect, the present application further provides a computer-readable storage medium, in which instructions are stored in the computer-readable storage medium, which when executed on a computer, causes the computer to execute the method described in the above aspects.

In a seventh aspect, the present application also provides a computer program product including instructions, which when executed on a computer, causes the computer to perform the method described in the above aspects.

The data transmission methods described in the first to third aspects of the embodiments of the present application may be implemented as an independent solution, respectively, or the data transmission methods described in any two of the first to third aspects of the embodiments of the present application may be They can be implemented as a solution in combination, or the first to third aspects of the embodiments of the present application can be implemented as a solution in combination.

BRIEF DESCRIPTION

FIG. 1 is a schematic structural diagram of a communication system provided by this application;

2 is a schematic diagram of a voice call process provided by this application;

FIG. 3 is a schematic diagram of a voice call process when the network connection between UE A and gNB 1 is disconnected according to this application;

FIG. 4 is a schematic diagram of a voice call process when a network connection between UE A and gNB 1 is restored provided by this application;

FIG. 5 is a schematic diagram of a voice call process provided when the network connection between UE B and gNB 2 is disconnected according to this application;

FIG. 6 is a schematic diagram of a voice call process when the network connection between UE B and gNB 2 is restored;

7 is a schematic flowchart of a data transmission method provided by this application;

8A is a schematic diagram of a data transmission process corresponding to scenario 1 provided by this application;

8B is a schematic diagram of a data transmission process corresponding to scenario 2 provided by this application;

8C is a schematic diagram of a data transmission process corresponding to scenario three provided by this application;

8D is a schematic diagram of a data transmission process corresponding to scene four provided by this application;

8E is a schematic diagram of a data transmission process corresponding to scenario five provided by this application;

8F is another schematic diagram of another data transmission process corresponding to scenario five provided by this application;

9 is a schematic structural diagram of a communication device provided by this application;

10 is a schematic structural diagram of a communication device provided by this application.

detailed description

In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be described in further detail below with reference to the accompanying drawings.

The data transmission method provided by the embodiments of the present application may be applied to a communication system. The architecture of the communication system may be as shown in FIG. 1 and includes a first terminal device, a first access network device, a second access network device, and a second terminal device, between the first terminal device and the first access network device Uplink data transmission and downlink data transmission can be performed, and uplink data transmission and downlink data transmission can be performed between the second terminal device and the second access network device.

The communication system involved in the embodiments of the present application may be various types of communication systems, for example, it may be a long term evolution (LTE), or a fifth generation (5G) communication system, or a hybrid architecture of LTE and 5G. It can also be 5G new radio (NR) system, global mobile communication system (global system for mobile communication, GSM), mobile communication system (universal mobile telecommunications system, UMTS), code division multiple access (code division multiple access) access, CDMA) system, and new communication systems appearing in the future development of communication, etc.

Among them, the first access network device or the second access network device may be an ordinary base station (such as Node B or eNB), may be a new radio controller (new radio controller, NR controller), or may be a 5G system gNode B (gNB), which can be a centralized network element (Centralized Unit), a new wireless base station, a radio frequency remote module, a micro base station, a relay, or a distributed network element ( A distributed unit may be a reception point (transmission reception point, TRP) or a transmission point (transmission point, TP) or any other wireless access device, but the embodiments of the present application are not limited thereto.

The first terminal device or the second terminal device, also called user equipment (UE), is a device that provides voice and/or data connectivity to users, for example, a sensor with network access function, Hand-held devices and car-mounted devices with wireless connectivity. Common terminals include, for example, mobile phones, tablet computers, notebook computers, PDAs, mobile Internet devices (MID), and wearable devices, such as smart watches and smart bracelets.

The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly explain the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. With the evolution of the architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

Currently, a jitter buffer (Jitter buffer) of 40 ms to 60 ms is provided in the terminal device to eliminate jitter. However, in the scenario of weak uplink coverage and the switching of the first terminal device, the voice packets sent by the first terminal device to the core network (core network, CN) will still show large jitter, especially when the switching time is greater than 60ms, which may cause the core network or the first Second, the terminal equipment loses packets, resulting in a drop in the subjective assessment method (mean opinion score, MOS) of voice. However, in the scenario of weak downlink coverage and switching of the second terminal device, the network connection between the second terminal device and the second access network device is interrupted, and the voice packets received by the second access network device are buffered in the second access In the PDCP buffer of the network device, when the network connection between the second terminal device and the second access network device is restored, the voice packets buffered by the second access network device are sent to the second terminal device in one scheduling. If the time when the network connection between the second terminal device and the second access network device is interrupted is greater than 60 ms, the second terminal device may cause packet loss, resulting in a decrease in the MOS score.

Taking the first terminal device and the second terminal device as an example of a voice call, the voice call process is as follows: As shown in FIG. 2, the first terminal device sends each voice packet to the first access network device at an interval of 20 ms Packet, and then the first access network device forwards it to the second access network device after receiving the voice packet, and the second access network device forwards it to the second terminal device. After receiving the voice packet, the second terminal device first buffers it in the Jitter buffer. The data buffered in the Jitter buffer is sent to the processor of the second terminal device for voice processing after a certain time interval.

When the first terminal device performs handover, as shown in FIG. 3, the network connection between the first terminal device and the first access network device is disconnected, and uplink data transmission is interrupted, so the first terminal device cannot send the second terminal device The device sends voice packets every 20 ms, and no voice packets in the first access network device can be sent to the second terminal device, resulting in no data reception during the switching of the first terminal device by the second terminal device, and the Jitter of the second terminal device Buffer is empty, which has a serious impact on MOS points. In addition, during the handover of the first terminal device, multiple voice packets are accumulated in the PDCP cache of the first terminal device. As shown in FIG. 4, voice packets 4-7 are accumulated in the PDCP cache of the first terminal device. When the switching of the first terminal device is completed, the voice packets 4 to 7 accumulated in the PDCP buffer are sent to the first access network device in one scheduling (if the first terminal device is switched to access the third access network device, Then, voice packets 4-7 are sent to the third access network device in one scheduling), and then the first access network device sends voice packets 4-7 to the second access network device in one scheduling, and the second The access network device forwards the voice packets 4-7 to the second terminal device. Generally, the Jitter Buffer size of the UE is set to 2 to 3 voice packets, and voice packets exceeding this limit will be discarded. Therefore, when the voice packet accumulated in the PDCP buffer of the first terminal device exceeds 3, the second terminal device The excess voice packet will be discarded, that is, the second terminal device will discard the voice packet 7, thereby affecting the MOS score.

When the second terminal device performs handover, as shown in FIG. 5, the network connection between the second terminal device and the second access network device is disconnected, and downlink data transmission is interrupted, so the first terminal device sends the second terminal device The transmitted voice packet is buffered in the PDCP buffer of the second access network device, which results in no data reception during the handover process of the second terminal device, and the Jitter Buffer of the second terminal device is empty, which seriously affects the MOS score. When the network connection between the second terminal device and the second access network device is restored, the second access network device sends the buffered multiple voice packets in a single schedule, as shown in FIG. 6, the second access Voice packets 4-7 are accumulated in the PDCP cache of the network device. After the network connection between the second terminal device and the second access network device is restored, the second access network device sends the voice packets 4-7 to the second terminal device in one scheduling. Generally, the Jitter Buffer size of the UE is set to 2 to 3 voice packets, and voice packets exceeding this limit will be discarded. Therefore, when there are more than 3 voice packets accumulated in the PDCP buffer of the second access network device, the second The terminal device will discard the excess voice packet, that is, the second terminal device will discard the voice packet 7, thereby affecting the MOS score.

Based on this, the embodiments of the present application provide a data transmission method and device to solve the problem of easy packet loss when the terminal device is switched. Among them, the method and the device are based on the same inventive concept. Since the principles of the method and the device to solve the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated here.

The plural mentioned below in the embodiments of the present invention refer to two or more than two.

In addition, it should be understood that in the description of this application, the words "first" and "second" are only used to distinguish the description, and cannot be understood as indicating or implying relative importance, nor as an indication. Or suggest the order.

The data transmission method provided by the present application will be specifically described below with reference to the drawings.

Referring to FIG. 7, it is a flowchart of a first data transmission method provided by this application. This method can be applied to business scenarios with regular data packet transmission intervals, such as voice call scenarios. The following uses a voice call scenario as an example for description. The data transmission method includes:

S701. A first access network device receives a voice packet from a first terminal device, and the first access network device is an access network device accessed by the first terminal device.

Here, the first access network device may include multiple voice packets received from the first terminal device, for example, the first access network device may sequentially receive voice packet 1, voice packet 2, voice packet 3, etc. from the first terminal device Wait. Alternatively, the first access network device may also receive multiple voice packets such as voice packet 1, voice packet 2, and voice packet 3 from the first terminal device at a time.

S702. The first access network device caches the voice packet in a preset buffer area. The first access network device may sequentially buffer the voice packets to the preset buffer area according to the time sequence of receiving. Among them, voice packets can be buffered in a preset buffer area in the form of a queue. For example, the first access network device caches voice packet 1 at the head of the cache queue, caches voice packet 2 after voice packet 1, caches voice packet 3 after voice packet 2, and so on.

In an implementation manner, after receiving the first voice packet from the first terminal device, the first access network device may delay the first voice packet for transmission after a second preset duration, that is, the first After receiving the first voice packet from the first terminal device, an access network device caches the first voice packet in a preset buffer area for a second preset duration.

Exemplarily, the second preset duration meets the following formula:

0≤T≤t1-t2;

Wherein, T is the second preset duration, and t1 is the maximum voice packet transmission delay accepted by the second terminal device, for example, for end-to-end voice packets, the acceptable range of the human ear hearing The maximum voice packet transmission delay is 300ms, then the maximum voice packet transmission delay accepted by the terminal device may be 300ms. The t2 is the average duration required for the voice packet to be transmitted from the first access network device to the second terminal device. Exemplarily, t2 may be determined according to experience, or may be determined by statistical historical transmission duration, etc. .

In the above manner, by delaying the first voice packet and sending it, the number of voice packets buffered in the preset buffer area of the first access network device can be increased, for example, the first voice packet is sent after being delayed by 100 ms, The first access network device may buffer the 5 voice packets received during the 100 ms in a preset buffer area, so that the preset buffer area of the first access network device adds at least 5 voice packets. Therefore, when the network connection between the first terminal device and the first access network device is interrupted, the first access network device may have more voice packets that can be sent to the second terminal device, so the second terminal device is in the first During the interruption of the network connection between the terminal device and the first access network device, voice packets can also be continuously received, thereby reducing the voice terminal situation and improving the MOS score.

In addition, by delaying the transmission of the first voice packet, the first access network device can buffer a larger number of voice packets, thereby ensuring to a certain extent that the next voice packet has been cached when a certain voice packet is sent, Furthermore, it can be ensured that the two voice packets can be sent according to the preset sending interval. Therefore, delaying the sending of the first voice packet can better control the interval of sending the voice packets, thereby reducing the voice packets received by the second terminal device Jitter, which in turn improves MOS points. For example, taking the sending interval of 20 ms as an example, if the first voice packet is not delayed, the first access network device may not receive the next voice packet within 20 ms after sending a certain voice packet Therefore, the two voice packets cannot be sent according to the sending interval of 20ms, and the method of delaying the sending of the first voice packet by 100ms can make the preset buffer area of the first access network device send the first The next 5 voice packets can be cached for each voice packet. Since the first voice packet is delayed to be sent, the subsequent voice packets must be delayed by 100ms accordingly. Therefore, the first access network device can cache this voice packet when sending a certain voice packet. Five voice packets behind the voice packet, so that after the voice packet is sent, the next voice packet can be sent at an interval of 20 ms.

S703: The first access network device sequentially sends the voice packets buffered in the preset buffer area to the second terminal device through the second access network device according to the received time sequence, and the second access network device An access network device accessed by the second terminal device.

In this application, "sequential transmission" can be understood as sending one voice packet by one voice packet, that is, sending one voice packet in one scheduling.

In the embodiment of the present application, during the data transmission process, the first access network device may cache the voice packet sent by the first terminal device in a preset buffer area, and then send it to the second access network device in sequence. When the network connection between the first terminal device and the first access network device is interrupted, the first access network device may send the voice packet buffered in the preset buffer area to the second access network device, so that the second terminal device During the handover of the first terminal device, a voice packet may also be received, thereby reducing the interruption of the voice of the second terminal device. In addition, when the network connection between the first terminal device and the first access network device is restored, the first access network device first buffers the voice packet accumulated in the first terminal device during the interruption period in the preset buffer area , And then send them to the second access network device in sequence. Compared with the prior art, the first access network device sends the voice packets accumulated by the first terminal device during the interruption to the second terminal device at a time. To a certain extent, the phenomenon of packet loss due to too many voice packets received by the second terminal device at one time is avoided.

In addition, according to the data transmission method provided by the embodiment of the present application, when the network connection between the second terminal device and the second access network device is interrupted, the voice packet sent by the first terminal device to the second terminal device is first buffered in the first In the preset buffer area of an access network device, the first access network device sequentially sends to the second access network device, compared with the prior art, the first access network device directly sends to the second access network Device, during the network connection between the second terminal device and the second access network device is interrupted in the embodiment of the present application, the first access network device may actively buffer the voice packets sent by the first terminal device, thereby reducing the second The number of voice packets accumulated by the access network device during the interruption, to a certain extent, can avoid the phenomenon of packet loss caused by the second terminal device due to too many voice packets received at one time.

In a possible implementation manner, the voice packet received by the first access network device from the first terminal device may include a first voice packet and a second voice packet. When receiving the voice packet from the first terminal device, the first access network device may sequentially receive the first voice packet and the second voice packet from the first terminal device. Therefore, when the first access network device sequentially sends the voice packets buffered in the preset buffer area to the second terminal device through the second access network device according to the received time sequence, the first voice The packet and the second voice packet are sequentially sent to the second terminal device through the second access network device.

In a possible implementation manner, after the first access network device sends the first voice packet, the time that the second voice packet is buffered in the preset buffer area exceeds a preset threshold At this time, the first access network device may send the second voice packet to the second terminal device through the second access network device.

In another possible implementation manner, after the first access network device sends the first voice packet, when the number of voice packets buffered in the preset buffer area is greater than a preset value, the first An access network device may send the second voice packet to the second terminal device through the second access network device.

In another possible implementation manner, after sending the first voice packet, the first access network device may also send the second access network device to the second terminal at a first preset duration The device sends the second voice packet. The type of the second voice packet is different, and the value of the second preset duration of the interval is different. Exemplarily, if the type of the second voice packet is a voice frame, the first preset duration may be equal to the first preset value, if The type of the second voice packet is a silent frame, and the second preset duration may be equal to the second preset value.

In an implementation manner, when the second access network device determines that the second terminal device is about to perform handover, the second access network device may send the handover command to the second terminal device before sending a handover command to the second terminal device. The second terminal device sends N voice packets, where N is an integer, and 0<N≤M, where M is the maximum number of voice packets buffered in the debounce buffer in the second terminal device.

Among them, the second access network device may determine that the second terminal device will be handed over in any of the following ways:

Manner 1: The second access network device receives the measurement report sent by the second terminal device, and determines that the terminal device is about to perform handover based on the measurement report.

Manner 2: The second access network device determines that the second terminal device is about to switch based on the load of the second access network device.

Of course, the second access network device may also determine that the second terminal device is about to switch by other means, such as actively triggering the second terminal device to switch, etc., which is not specifically limited here.

An exemplary description: if the number of buffered voice packets in the second access network device is greater than the M, the N may be equal to the M, and the N voice packets may be the second The first M voice packets in the access network device that have buffered voice packets in the order of receiving time. That is, if the number of buffered voice packets in the second access network device is greater than the M, the second access network device may send the second access network device to the second terminal device in one scheduling The first M voice packets of the buffered voice packets in the order of receiving time.

Further, if the number of buffered voice packets in the second access network device is greater than the M, the second access network device may also divide the buffered voice packets by the first M voice packets The other voice packets are forwarded to the third access network device. The third access network device is a target access network device when the second terminal device performs handover.

Another exemplary description, if the number Q of buffered voice packets in the second access network device is not greater than the M, then N=Q, that is, the N voice packets may be the second access Q voice packets that have been buffered in the network device, then the second access network device may send the Q voice packets that have been buffered in the second access network device to the terminal device in one scheduling. If the number Q of buffered voice packets in the second access network device is greater than the M, then N=M, then the N voice packets may be Q buffered in the second access network device The first M voice packets in the voice packet, then the second access network device may send the first M voice packets in the buffered voice packets in the second access network device to the terminal device in one scheduling.

S704. The second access network device sequentially receives voice packets from the first terminal device through the first access network device.

Here, the second access network device may include multiple voice packets received from the first terminal device. For example, the second access network device may sequentially receive voice packets such as voice packet 1, voice packet 2, and voice packet 3 from the first access network device. Alternatively, the second access network device may also receive multiple voice packets such as voice packet 1, voice packet 2, and voice packet 3 from the first access network device at a time.

In an implementation manner, after receiving the voice packet sent by the first access network, the second access network device may buffer the voice packet. Among them, voice packets can be buffered in a preset buffer area in the form of a queue.

Further, the second access network device may send a buffered voice packet to the second terminal device at a third preset duration in intervals of reception time. Among them, the type of the voice packet is different, and the value of the third preset duration of the interval is different. Exemplarily, if the type of the voice packet is a voice frame, the third preset duration may be equal to the third preset value, if the type of the voice packet For the silent frame, the third preset duration may be equal to the fourth preset value. The third preset value may be equal to the first preset value, or may not be equal to the first preset value, and the fourth preset value may be equal to the second preset value, or may not be equal to the second preset value. limited.

Compared with the prior art, when the network connection between the second access network device and the second terminal device is restored, the second access network sends multiple voice packets to the second terminal device at a time, resulting in the second terminal device The number of voice packets received exceeds the size of the Jitter buffer, resulting in packet loss. In the embodiment of the present application, when the network connection between the second access network device and the second terminal device is restored, the second access network device may send the buffered voice packets to the second terminal device one by one, so that The problem of packet loss caused by too many voice packets received by the second terminal device at a time is avoided, and MOS points can be improved.

In order to better understand the embodiments of the present application, the following describes the data transmission process between the first terminal device and the second terminal device in detail with reference to specific application scenarios. The first terminal device accesses the first access network device, and the second terminal device accesses the second access network device.

Scenario 1: The network connection between the first terminal device and the first access network device is normal, and the network connection between the second terminal device and the second access network device is normal. For the data transmission process between the first terminal device and the second terminal device, refer to FIG. 8A.

A1, the first terminal device sequentially sends voice packet 1, voice packet 2, voice packet 3, voice packet 4 to the first access network device.

A2, the first access network device buffers the voice packet 1, the voice packet 2, the voice packet 3, the voice packet 4... received in sequence from the first terminal device in the buffer queue of the preset buffer area.

A3. After receiving the voice packet 1, the first access network device delays the second preset duration and then buffers the voice packet 1, the voice packet 2, the voice packet 3, the voice packet 4 in the buffer queue according to the received time sequence... In turn, it is sent to the second terminal device through the second access network device.

The second preset duration may be equal to t1-t2-t3 duration. It is assumed that the maximum transmission delay of the voice packet accepted by the second terminal device is 300 ms, that is, t1 is equal to 300 ms. The average time required for the voice packet to be transmitted from the first access network device to the second terminal device is 50 ms, that is, t2 is equal to 50 ms. Since voice packet 1 is the first voice packet received by the first access network device from the first terminal device, there is no buffered voice packet in the buffer queue, that is, t3 is equal to 300 ms. Therefore, the first access network device delays 250 ms after receiving voice packet 1.

Taking voice packet 2 as an example, the process of sending voice packet 2 after the first access network device sends voice packet 1 may be implemented in any of the following ways:

Manner 1: The first access network device may send the voice packet 2 after sending the voice packet 1 after a first preset duration.

In an embodiment, the first access network device starts the first timer after sending the voice packet 1, and sends the voice packet 2 when the first timer expires, and the time duration of the first timer is equal to the first preset duration.

Exemplarily, the first preset duration may be equal to the time interval at which the first terminal device sends a voice packet. For example, if the first terminal device sends a voice packet every 20 ms, the time duration of the first timer may be equal to 20 ms. An access network device may start a first timer after sending a voice packet 1, and send a voice packet 2 when the first timer expires.

Manner 2: After the voice packet 1 is sent by the first access network device, if the time that the voice packet 2 is buffered in the buffer queue is greater than or equal to a preset threshold, the first access network device sends the voice packet 2.

In an embodiment, the first access network device may start a second timer when it receives the voice packet 2, the second timer may be used to record the time that the voice packet 2 is buffered in the buffer queue, and the second The duration of the timer is equal to the preset threshold. The first access network device sends a voice packet 2 when the second timer expires.

Manner 3: After the voice packet 1 is sent by the first access network device, if the number of voice packets buffered in the buffer queue is greater than or equal to a preset value, the first access network device may send voice packet 2.

The process of sending the voice packet 3 by the first access network device, the process of sending the voice packet 4 by the first access network device,. Repeat again.

Scenario 2: The network connection between the first terminal device and the first access network device is interrupted. For the data transmission process between the first terminal device and the second terminal device, refer to FIG. 8B.

A4. During the interruption of the network connection between the first terminal device and the first access network device, the first access network device sequentially passes the voice packets buffered in the buffer queue before the interruption through the second access according to the received time sequence The network device sends to the second terminal device.

For example, when the network connection between the first terminal device and the first access network device is interrupted, the preset buffer area of the first access network device buffers voice packets 4-7, then the first terminal device and the first access During the interruption of the network connection between the network devices, the first access network device sends the voice packet 4, voice packet 5, voice packet 6, and voice packet 7 to the second terminal device in sequence through the second access network device.

Compared with the prior art, when the network connection between the first terminal device and the first access network device is interrupted, the first access network device has no voice packets to receive, resulting in the second terminal device having no voice packets to receive, The voice call is interrupted. In the embodiment of the present application, during the interruption of the network connection between the first terminal device and the first access network device, the second terminal device may receive the voice buffered in the preset buffer area of the first access network device Package, which can reduce the interruption duration of the voice call to a certain extent. When the network connection between the first terminal device and the first access network device is interrupted for a relatively short time, it can even avoid the interruption of the voice call, which can improve MOS points.

Scenario 3: The network connection between the first terminal device and the first access network device is restored. For the data transmission process between the first terminal device and the second terminal device, refer to FIG. 8C.

A5. The first terminal device sends multiple voice packets accumulated during the interruption to the first access network device in one uplink scheduling. For example, the first terminal device sends voice packets 8 to 11 accumulated during the interruption to the first access network device in one uplink scheduling.

A6: The first access network device buffers the multiple voice packets in a buffer queue, and sends them to the second terminal device through the second access network device in sequence. For example, the first access network device buffers the voice packets 8 to 11 received from the first terminal device in a buffer queue, and sends the voice packets 8 to 11 in sequence to the second through the second access network device Terminal equipment, wherein the first access network device sends the voice packet 9 after sending the voice packet 8, the process of sending the voice packet 10 after sending the voice packet 9, and the voice packet 11 after sending the voice packet 10 For the process, refer to the process of sending the voice packet 2 after the first access network device sends the voice packet 1 in step A3, and details are not repeated here.

Compared with the prior art, after the network connection between the first terminal device and the first access network device is restored, the first access network device passes a plurality of voice packets received from the first terminal device through the second access The network device sends to the second terminal device at a time, so that the second terminal device receives a large number of voice packets in one scheduling, resulting in packet loss. The embodiment of the present application is between the first terminal device and the first access network device. After the network connection is restored, the first access network device may send a plurality of voice packets accumulated by the first terminal device to the second access network device one by one, so that the second access network device may store the accumulated voice packets of the first terminal device Multiple voice packets are sent to the second terminal device one by one, so that the phenomenon of packet loss caused by too many voice packets received by the second terminal device in one scheduling can be avoided, thereby further improving the MOS score.

Scenario 4, as shown in FIG. 8D, assume that the first terminal device sends voice packet 8 to voice packet 11 to the second terminal device, and the first access network device first receives voice packet 8 to voice packet from the first terminal device 11 Cache in the buffer queue, and then send voice packets 8 to 11 to the second access network device in sequence. Therefore, the second access network device sequentially sends voice packets 8 to 11 to the second terminal device.

Compared with the first access network device, after receiving the voice packets 8 to 11 from the first terminal device and buffering them in the buffer queue, all the voice packets 8 to 11 are sent to the second access in one transmission process The network device enables the second access network device to send all the voice packets 8 to 11 to the second terminal device in one scheduling process, and the first access network device buffers the voice packets 8 to 11 in the queue Sequentially sent to the second access network device, so that the second access network device can sequentially send voice packets 8 to 11 to the second terminal device, thereby reducing the amount of data sent by the second access network in a scheduling process, and It can avoid the phenomenon of packet loss caused by too many voice packets received by the second terminal device in one scheduling, and can further improve the MOS score.

Scenario five, the second terminal device determines that the second terminal device is about to switch to the third access network device. Wherein, the second terminal device buffers Q voice packets, and the maximum number of voice packets buffered in the debounce buffer area in the second terminal device is M. If Q>M, steps A7 and A8 are performed. If Q≤M, step A9 is executed.

A7. Before sending a handover command to the second terminal device, the second access network device sends the first M voice packets of the Q voice packets in the order of reception time to the second terminal device in one scheduling .

A8. The second access network device forwards other voice packets except the first M voice packets of the Q voice packets to the third access network device.

For example, if M is equal to 3 and Q voice packets are voice packet 10 to voice packet 14, the second access network device sends the second terminal device to the second terminal device in one scheduling before sending the handover command to the second terminal device Send voice packet 10 to voice packet 12, and forward voice packet 13 and voice packet 14 to the third access network device. For the data transmission process between the first terminal device and the second terminal device, refer to FIG. 8E.

Compared with the prior art, the second access network forwards all voice packets 10 to 14 to the third access network device. In the embodiment of the present application, the second access network device passes the The terminal device sends the voice packet 9 to the voice packet 12, so that the second terminal device can process the voice packet 9 to the voice packet 12 during the handover, so that the interruption time during the voice call can be reduced to a certain extent. When the switching time is relatively short, the interruption of the voice call can even be avoided, so the MOS points can be improved to a certain extent. In addition, the second access network device sends voice packets 9 to 12 to the second terminal device before switching, so that when the second terminal device switches to the third access network, the third access network device sends The terminal device sends two voice packets, that is, voice packet 13 and voice packet 14, so that the phenomenon of packet loss caused by too many voice packets received by the second terminal device in one scheduling can be avoided, and the MOS score can be improved.

A9. Before sending a handover command to the second terminal device, the second access network device sends the Q voice packets to the second terminal device in one scheduling.

For example, if M is equal to 3 and Q voice packets are voice packet 10 to voice packet 12, then the second access network device sends the second terminal device a schedule before sending a handover command to the second terminal device Send voice packet 10 ~ voice packet 12. For the data transmission process between the first terminal device and the second terminal device, refer to FIG. 8F.

Compared with the prior art, the second access network forwards all the voice packets 10 to 14 to the third access network device, and the third access network device switches the second terminal device to the third access network device. The network access device sends to the second terminal device in one scheduling. In the embodiment of the present application, the second access network device sends voice packets 9 to 12 to the second terminal device before the handover, so that the second terminal device can process the voice packets 9 to 12 during the handover, The interruption time during the voice call can be reduced to a certain extent. When the switching time of the second terminal device is relatively short, the interruption of the voice call can even be avoided, so the MOS score can be improved to a certain extent.

Based on the same inventive concept as the method embodiments, embodiments of the present application provide a communication device. The structure of the communication device may be as shown in FIG. 9 and includes a processing unit 901 and a transceiver unit 902.

In an embodiment, the apparatus may be specifically used to implement the method performed by the first access network device in the embodiments described in FIG. 7 to FIG. 8F. The device may be the first access network device itself, or may be the first A part of a chip or chipset or chip in an access network device used to perform related method functions. The transceiver unit 902 may be used to receive voice packets from a first terminal device, and the first access network device is an access network device accessed by the first terminal device. The processing unit 901 is configured to buffer the voice packet received by the transceiver unit 902 in a preset buffer area. The transceiver unit 902 is further configured to sequentially send the voice packets buffered in the preset buffer area to the second terminal device through the second access network device according to the received time sequence, and the second access network device is An access network device accessed by the second terminal device.

The processing unit and the transceiver unit may also be used to perform other steps corresponding to the first access network device in the foregoing method embodiments. For details, refer to the foregoing method embodiments, and details are not repeated here.

In another embodiment, the apparatus may be specifically used to implement the method performed by the second access network device in the embodiments described in FIG. 7 to FIG. 8F. The device may be the second access network device itself, or may be A part of the chip or chipset or chip in the second access network device for performing the relevant method function. Wherein, the transceiving unit 902 is configured to sequentially receive voice packets from the first terminal device through the first access network device, and the first access network device is an access network device accessed by the first terminal device. The second access network device is an access network device accessed by the second terminal device; the processing unit 901 is used to buffer the voice packet; and the transceiver unit 902 is also used to pre-determine each interval according to the chronological order of reception Set a duration to send the buffered voice packet to the second terminal device.

The processing unit and the transceiver unit may also be used to perform other steps corresponding to the second access network device in the foregoing method embodiments. For details, refer to the foregoing method embodiments, and details are not repeated here.

In another embodiment, the apparatus may be specifically used to implement the method performed by the source access network device in the embodiments described in FIG. 7 to FIG. 8F. If the first terminal device performs handover, the source access network device is the first An access network device, if the second terminal device performs handover, the source access network device is the second access network device.

Taking the second terminal device for handover, the source access network device is the second access network device as an example. The source access network device may be the second access network device itself, or may be the second access network device. A part of a chip or chipset or chip used to perform relevant method functions. The processing unit 901 is used to determine that the terminal device is about to switch. The transceiver unit 902 is configured to send N voice packets to the terminal device in one scheduling before sending a switching command to the terminal device, where N is an integer, and 0<N≤M, where M is all The maximum number of voice packets buffered in the debounce buffer area of the terminal device.

The division of the modules in the embodiments of the present application is schematic, and is only a division of logical functions. In actual implementation, there may be another way of dividing. In addition, the functional modules in the embodiments of the present application may be integrated into one In the device, it can also exist alone physically, or two or more modules can be integrated into one module. The above integrated modules may be implemented in the form of hardware or software function modules.

When the integrated module can be implemented in hardware, the communication device may be as shown in FIG. 10, and the communication device may be the first access network device or a chip in the first access network device. The communication device may also be a chip in the second access network device or the second access network device. The communication device may also be a source access network device or a chip in the source access network device. The communication device may include a processor 1001, a communication interface 1002, and a memory 1003. The processing unit 901 may be the processor 1001. The sending unit 902 may be a communication interface 1002.

The processor 1001 may be a central processing unit (CPU) or a digital processing module. The communication interface 1002 may be a transceiver, an interface circuit such as a transceiver circuit, or a transceiver chip. The communication device further includes a memory 1003 for storing the program executed by the processor 1002. The memory 1003 may be a non-volatile memory, such as a hard disk (HDD) or a solid-state drive (SSD), etc., or may be a volatile memory (volatile memory), such as random access memory -access memory, RAM). The memory 1003 is any other medium that can be used to carry or store a desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

The processor 1001 is used to execute the program code stored in the memory 1003, and is specifically used to execute the actions of the above-mentioned processing unit 1601, which will not be repeated here.

In the embodiments of the present application, the specific connection medium between the communication interface 1001, the processor 1002, and the memory 1003 is not limited. In the embodiment of the present application, in FIG. 10, the memory 1003, the processor 1002, and the communication interface 1001 are connected by a bus 1004. The bus is shown by a thick line in FIG. , Not to limit. The bus can be divided into an address bus, a data bus, and a control bus. For ease of representation, only a thick line is used in FIG. 10, but it does not mean that there is only one bus or one type of bus.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

This application is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the application. It should be understood that each flow and/or block in the flowchart and/or block diagram and a combination of the flow and/or block in the flowchart and/or block diagram may be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processing machine, or other programmable data processing device to produce a machine that enables the generation of instructions executed by the processor of the computer or other programmable data processing device An apparatus for realizing the functions specified in one block or multiple blocks of one flow or multiple flows of a flowchart and/or one block or multiple blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, the instructions The device implements the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operating steps are performed on the computer or other programmable device to produce computer-implemented processing, which is executed on the computer or other programmable device The instructions provide steps for implementing the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.

Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. In this way, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A data transmission method, characterized in that the method is applied in a voice call scenario, including:

The first access network device receives a voice packet from a first terminal device, and the first access network device is an access network device accessed by the first terminal device;

The first access network device caches the voice packet in a preset buffer area;

The first access network device sequentially sends the voice packets buffered in the preset buffer area to the second terminal device through the second access network device according to the received time sequence, and the second access network device is The access network device accessed by the second terminal device.
The method of claim 1, wherein the voice packet includes a first voice packet and a second voice packet, and the first access network device receiving the voice packet from the first terminal device includes:

The first access network device sequentially receives the first voice packet and the second voice packet from the first terminal device;

The first access network device sequentially sending the voice packets buffered in the preset buffer area to the second terminal device through the second access network device according to the received time sequence includes:

The first access network device sequentially sends the first voice packet and the second voice packet to the second terminal device through the second access network device.
The method according to claim 2, wherein the first access network device sends the first voice packet and the second voice packet to the second access network device in sequence through the second access network device Two terminal equipment, including:

After the first access network device sends the first voice packet, when the time that the second voice packet is buffered in the preset buffer area exceeds a preset threshold, the first access network The device sends the second voice packet to the second terminal device through the second access network device; or

After the first access network device sends the first voice packet, when the number of voice packets buffered in the preset buffer area is greater than a preset value, the first access network device passes the second The network access device sends the second voice packet to the second terminal device; or

After the first access network device sends the first voice packet, the second voice packet is sent to the second terminal device through the second access network device at a first preset duration.
The method of claim 3, wherein if the second voice packet is a voice frame, the first preset duration is equal to the first preset value;

If the second voice packet is a silent frame, the first preset duration is equal to the second preset value.
The method according to any one of claims 1 to 4, wherein the method further comprises:

After receiving the first voice packet from the first terminal device, the first access network device delays sending the first voice packet by a second preset duration, and the second preset duration meets the following formula :

0≤T≤t1-t2;

Wherein, T is the second preset duration, t1 is the maximum voice packet transmission delay accepted by the second terminal device; and t2 is the voice packet transmission from the first access network device to The average duration required by the second terminal device.
A data transmission method, characterized in that the method is applied in a voice call scenario, including:

The second access network device sequentially receives voice packets from the first terminal device through the first access network device, the first access network device is an access network device accessed by the first terminal device, and the second The access network device is an access network device accessed by the second terminal device;

The second access network device caches the voice packet;

The second access network device sends a buffered voice packet to the second terminal device according to a preset time interval at a predetermined time interval in the received time sequence.
The method of claim 6, wherein if the voice packet is a voice frame, the preset duration is equal to a first preset value;

If the voice packet is a silent frame, the preset duration is equal to the second preset value.
A data transmission method, characterized in that the method is applied in a voice call scenario, including:

The source access network device determines that the terminal device is about to switch;

Before sending a handover command to the terminal device, the source access network device sends N voice packets to the terminal device in one scheduling, where N is an integer, and 0<N≤M, where M is The maximum number of voice packets buffered in the debounce buffer area of the terminal device.
The method according to claim 8, wherein if the number of buffered voice packets in the source access network device is greater than the M, the N is equal to the M, and the N voice packets are The first M voice packets in the source access network device that have buffered voice packets in the order of receiving time; or

If the number of buffered voice packets in the source access network device is not greater than the M, the N voice packets are buffered voice packets in the source access network device.
The method according to claim 9, wherein if the number of voice packets buffered in the source access network device is greater than the M, the method further comprises:

The source access network device forwards the voice packets other than the first M voice packets in the buffered voice packets to the target access network device.
The method according to any one of claims 8 to 10, wherein the source access network device determining that the terminal device is about to perform handover includes:

The source access network device receives the measurement report sent by the terminal device;

It is determined that the terminal device is about to be handed over based on the measurement report; or the source access network device determines that the terminal device is about to be handed over, including:

The source access network device determines that the terminal device is about to switch based on the load of the source access network device.
A communication device, characterized in that it includes a processor, the processor is coupled to a memory, and instructions are stored in the memory;

When the processor executes the instruction, the device is caused to perform the method according to any one of claims 1 to 5;

Or, when the processor executes the instruction, the device is caused to execute the method of claim 6 or 7;

Or, when the processor executes the instruction, the device is caused to execute the method according to any one of claims 8 to 11.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores a program, which can be implemented by any one of claims 1 to 5 when read and executed by one or more processors The method described; or, when the program is read and executed by one or more processors, the method of claim 6 or 7 can be implemented; or, the program is read and executed by one or more processors The method according to any one of claims 8 to 11 can be implemented during execution.