WO2014101111A1

WO2014101111A1 - Data transmission method and device

Info

Publication number: WO2014101111A1
Application number: PCT/CN2012/087847
Authority: WO
Inventors: 严平; 王崇泉; 吴玉忠
Original assignee: 华为技术有限公司
Priority date: 2012-12-28
Filing date: 2012-12-28
Publication date: 2014-07-03
Also published as: CN103703828A; CN103703828B

Abstract

Embodiments of the present invention provide a data transmission method and device. The method comprises: a first device sending multiple packet data unit (PDU) segments to a second device; the first device receiving an acknowledgement status report sent by the second device, the acknowledgement status report carrying segment sequence numbers of the PDU segments that need to be re-transmitted; the first device determining, according to the acknowledgement status report, whether the PDU segments corresponding to the segment sequence numbers need to be re-transmitted; and if it is determined that the PDU segments need to be re-transmitted, sending the PDU segments corresponding to the segment sequence numbers to the second device. The data transmission method and device provided by the embodiments of the present invention can improve the reliability of data transmission and reduce the call drop rate.

Description

The present invention relates to communication technologies, and in particular, to a data transmission method and device. Background technique

Currently, the transmitting end encapsulates the data packet (Packet Data Unit (PDU)) before transmitting the data packet according to the Radio Link Control (RLC), and then sends the encapsulated PDU to the packet. Receiving end. When a PDU is lost and the receiving end requests retransmission, the transmitting end may segment the PDU, re-adapt the air interface transmission resource size, form multiple PDU segments, and resend the multiple PDU segments to the receiving end. . When part of the PDU segment is lost, the receiving end sends a non-acknowledgment response to the sender ( Negative

-Acknowledge, abbreviation: NACK) Status report, requesting the sender to retransmit the lost PDU segment. The Nack report requires at least 9 bytes of transmission resources. However, for a cell edge or a region with strong interference, the transmission resources are limited, and the transmission resources required by the Nack report may not be met. Therefore, the receiver cannot form a Nack report, but can only form an Acknowledge (Ack) state. Reporting, using the Ack sequence number (Ack Sn) reported by the Ack to indicate the segment number (PDU SN ) corresponding to the missing PDU segment.

However, according to the RLC protocol, after receiving the Ack report sent by the receiving end, the transmitting end considers that the receiving end has acknowledged that the data that needs to be retransmitted has been received, so that the lost PDU segment will not be transmitted, which will result in data transmission. Failure, causing dropped calls. Summary of the invention

Embodiments of the present invention provide a data transmission method and device to improve reliability of data transmission and reduce call drop rate.

In a first aspect, an embodiment of the present invention provides a data transmission method, including: a first device sending a plurality of packet data unit PDU segments to a second device; and the first device receiving an acknowledgement response status sent by the second device Reporting, the acknowledgement response status report carries a segment sequence number of a PDU segment that needs to be retransmitted; the first device determines, according to the acknowledgement response status report, Whether the PDU segment corresponding to the segment sequence number needs to be retransmitted; if it is determined that retransmission is required, the PDU segment corresponding to the segment sequence number is sent to the second device.

In a first implementation manner of the first aspect, the first device, according to the acknowledgement response status report, determining whether the PDU segment corresponding to the segment sequence number needs to be retransmitted, includes: Determining the response status report, determining whether the segment sequence number is equal to the segment sequence number of the PDU segment waiting to be answered; if the first device determines the segment sequence number and the segment sequence number of the PDU segment waiting to be acknowledged If the number of times of receiving the acknowledgment response status report carrying the segment sequence number is greater than or equal to the threshold value, if the distance is determined to be retransmitted, the PDU segment corresponding to the segment sequence number is sent to the PDU segment. The second device includes: if it is determined that the segment sequence number is equal to the segment sequence number of the PDU segment waiting to be acknowledged, and the number of times the acknowledgment response status report carrying the segment sequence number is received is greater than or equal to the threshold, Sending the PDU segment corresponding to the segment sequence number to the second device.

In a second aspect, the embodiment of the present invention provides a data transmission method, including: the second device sends a first acknowledgement response status report to the first device, where the first acknowledgement response status report carries a packet data unit PDU that needs to be retransmitted. a segmented sequence number, wherein the first device determines, according to the first acknowledgement response status report, whether the PDU segment corresponding to the segment sequence number needs to be retransmitted; the second device receives the first device to send The PDU segment corresponding to the segment sequence number, the PDU segment corresponding to the segment sequence number is a PDU segment in which the first device determines that the PDU segment corresponding to the segment sequence number needs to be retransmitted.

In a first implementation manner of the second aspect, the method further includes: the second device receiving the PDU segment sent by the first device, and carrying the segment sequence number of the PDU segment in a second acknowledgement response state The report is sent to the first device.

In a third aspect, the embodiment of the present invention provides a data transmission apparatus, including: a sending module, configured to send a plurality of packet data unit PDU segments to a second device; and a receiving module, configured to receive the acknowledgement sent by the second device a response status report, where the acknowledgment response status report carries a segment sequence number of the PDU segment that needs to be retransmitted; and a determining module, configured to determine, according to the acknowledgment response status report, whether the PDU segment corresponding to the segment sequence number needs to be And the sending module is further configured to: if the determining module determines that retransmission is required, send the PDU segment corresponding to the segment sequence number to the second device.

In a first implementation manner of the third aspect, the determining module is specifically configured to be used according to the The acknowledgement status report determines whether the segment sequence number is equal to the segment sequence number of the PDU segment waiting to be acknowledged; if it is determined that the segment sequence number is equal to or equal to a threshold number of the segment number of the PDU segment waiting to be acknowledged; The sending module is specifically configured to: if the determining module determines that the segment sequence number is equal to the segment sequence number of the PDU segment waiting to be acknowledged, and receives the acknowledgement status report carrying the segment sequence number, the number of times is greater than or equal to The threshold is sent to the second device by the PDU segment corresponding to the segment sequence number.

A fourth aspect of the present invention provides a data transmission apparatus, including: a sending module, configured to send a first acknowledgement response status report to a first device, where the first acknowledgement response status report carries packet data that needs to be retransmitted a segment sequence number of the unit PDU segment, for the first device to report, according to the first acknowledgement response status report, whether the PDU segment corresponding to the segment sequence number needs to be retransmitted; and a receiving module, configured to receive the a PDU segment corresponding to the segment sequence number sent by the first device, where the PDU segment corresponding to the segment sequence number is a PDU that the first device needs to retransmit in the PDU segment corresponding to the segment sequence number. Segmentation.

In a first implementation manner of the fourth aspect, the receiving module is further configured to receive a PDU segment sent by the first device, where the sending module is further configured to carry the segment sequence number of the PDU segment in The second acknowledgement response status report is sent to the first device.

In a fifth aspect, an embodiment of the present invention provides a transmitting end, including: a memory, configured to store an instruction, a processor coupled to the memory, the processor configured to execute an instruction stored in the memory, and The processor is configured to perform the data transmission method according to claim 1 or 2.

According to a sixth aspect, an embodiment of the present invention provides a receiving end, including: a memory, configured to store an instruction; a processor coupled to the memory, the processor configured to execute to be stored in the memory And the processor is configured to perform the data transmission method according to claim 3 or 4.

The data transmission method and device provided by the embodiment of the present invention, when the first device receives the ACK status report, determines whether the PDU segment corresponding to the segment sequence number carried in the ACK status report needs to be retransmitted, and if it is determined that the And transmitting, to the second device, the PDU segment corresponding to the segment sequence number, to support the successful transmission of data in a scenario that the second device does not receive the PDU but fails to send the NACK report, Reduced data transfer Risk of failure, lower call drop rate

DRAWINGS

The drawings used in the embodiments or the description of the prior art are briefly described. It is obvious that the drawings in the following description are some embodiments of the present invention, and are not creative to those skilled in the art. Other drawings can also be obtained from these drawings on the premise of labor.

1 is a flowchart of Embodiment 1 of a data transmission method according to the present invention;

2 is a flowchart of Embodiment 2 of a data transmission method according to the present invention;

3 is a flowchart of Embodiment 3 of a data transmission method according to the present invention;

4 is a signaling flowchart of Embodiment 4 of a data transmission method according to the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 1 of a data transmission apparatus according to the present invention; FIG.

6 is a schematic structural diagram of Embodiment 2 of a data transmission apparatus according to the present invention;

7 is a schematic structural diagram of an embodiment of a transmitting end according to the present invention;

FIG. 8 is a schematic structural diagram of an embodiment of a receiving end according to the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The data transmission method provided by the embodiments of the present invention relates to data transmission between a transmitting end and a receiving end through a wireless link, including an uplink and a downlink, and includes various wireless network standards. The transmitting end refers to a device that can send data to other devices through a wireless link, and may be a terminal or a base station. In the embodiments of the present invention, such a device is named as a first device; The device that receives the data sent by the other device by the wireless link may be a terminal or a base station. In the embodiments of the present invention, the device is named as the second device. Ready.

FIG. 1 is a flowchart of Embodiment 1 of a data transmission method according to the present invention. The execution body of this embodiment is a first device. As shown in FIG. 1, the method in this embodiment may include:

Step 101: The first device sends a plurality of packet data unit PDU segments to the second device. The scenario of step 101 is: the first device has previously sent data to the second device, and the data is encapsulated into a packet data unit (Radio Link Control, RLC for short) before being sent. For short: PDU), but due to insufficient resources of the wireless link, the PDU is lost. At this time, the second device requests the first device to retransmit the data. At this time, the first device will segment the PDU, re-adapt the size of the resource block (Resource Blocks, RB for short), form multiple PDU segments, and then send multiple PDU segments to the second device. .

Step 102: The first device receives an acknowledgement response status report sent by the second device, where the acknowledgement response status report carries a segment sequence number of a PDU segment that needs to be retransmitted.

According to the protocol of the RLC, when receiving the PDU segment sent by the first device, the second device sends a status report to the first device, and if the complete PDU segment has been received, the second device sends the status report. The status report is an Acknowledgement (ACK) status report, which carries the sequence number of the PDU that acknowledges the response; if the received PDU segment is incomplete, or does not receive a PDU segment corresponding to a sequence number, then the second The status report sent by the device is a Negative Acknowledge (NACK) status report, which carries the initial offset position and the end offset position of the PDU segment. The NACK status report requires more air interface resources than the ACK status report requires at least 9 bytes.

However, when the resources of the radio link are seriously insufficient, for example, the terminal is located at the edge of the cell or the area with strong interference, in which the scheduling of the wireless communication network will sacrifice the transmission rate to ensure the uplink signal strength and demodulation performance, for example, When the signal-to-noise ratio SINR falls below the threshold, the order of resource blocks (Resource Blocks, RBs) and Modulation and Coding Scheme (MCS) for each scheduling is reduced, so that the uplink signals are The strength is sufficient for the second device to demodulate the received data.

Therefore, when the PDU segment received by the second device is incomplete, or the PDU segment corresponding to a certain sequence number is not received, and the number of RBs is insufficient to form a NACK status report, The second device in this embodiment needs to send an ACK status report to the first device, where the ACK status report carries the sequence number of the PDU segment, that is, the segment sequence number of the PDU segment that needs to be retransmitted, to notify the first device that the device needs to Retransmit the PDU segment.

Step 103: The first device determines, according to the acknowledgement response status report, whether the PDU segment corresponding to the segment sequence number needs to be retransmitted. If it is determined that retransmission is required, the PDU corresponding to the segment sequence number is divided. The segment is sent to the second device.

In the prior art, according to the protocol of the RLC, when receiving the status report of the ACK, the first device does not judge or retransmit the PDU, but only retransmits the PDU when receiving the status report of the NACK.

Step 103 formally considers the following scenario: When the PDU segment received by the second device is incomplete, or the PDU segment corresponding to a sequence number is not received, and the number of RBs is insufficient to form a NACK status report, the second device The ACK status report can only be sent to the first device. Therefore, when receiving the ACK status report, the first device determines whether the PDU segment corresponding to the segment sequence number needs to be retransmitted; if it is determined that the ACK status report is sent in the scenario, that is, the PDU needs to be retransmitted, And sending the PDU segment corresponding to the segment sequence number to the second device.

In this embodiment, when the ACK status report is received by the first device, it is determined whether the PDU segment corresponding to the segment sequence number in the ACK status report needs to be retransmitted, and if it is determined that retransmission is required, the segment sequence number is corresponding. The PDU segment is sent to the second device to support the successful transmission of data in the scenario that the second device does not receive the PDU but cannot send the NACK report, thereby reducing the risk of data transmission failure and reducing the dropped call. rate.

FIG. 2 is a flowchart of Embodiment 2 of a data transmission method according to the present invention. The execution body of this embodiment is a first device. As shown in FIG. 2, the method in this embodiment may include:

Step 201: The first device sends a plurality of packet data unit PDU segments to the second device. Step 202: The first device receives an acknowledgement response status report sent by the second device, where the acknowledgement response status report carries a segment sequence number of a PDU segment that needs to be retransmitted.

Step 203: The first device determines, according to the acknowledgement response status report, whether the PDU segment corresponding to the segment sequence number needs to be retransmitted. If it is determined that retransmission is required, the PDU corresponding to the segment sequence number is divided. The segment is sent to the second device.

Step 203 may include the following sub-steps in a specific implementation: Step 2031: The first device determines, according to the acknowledgement response status report, whether the segment sequence number and the segment sequence number of the PDU segment waiting to be answered are equal.

Specifically, the first device locally stores a segment sequence number of the PDU segment waiting to be acknowledged after each transmission of the PDU segment. Generally, the first device locally maintains a list containing two variables, one of which is Acknowledgement state variable (VTA), the value of this variable is the segment number of the first PDU segment waiting for confirmation; the other is the send state variable (VTS) The value of the variable is the segment number of the next PDU segment to be sent; the two variables VTA and VTS are derived from the 3rd Generation Partnership Project (3GPP) protocol, and the version number is 3GPP TS 36.322 V10.0.0 (2010-12). In step 2031, the segment sequence number of the PDU segment carried in the received ACK status report may be compared with the value of the VTA to determine whether the two are equal.

If it is determined that the two are not equal, the first device processes according to the RLC protocol and the prior art method; if it is determined that the two are equal, the following steps are also required.

Step 2032: If the first device determines that the segment sequence number is equal to the segment sequence number of the PDU segment waiting to be acknowledged, it is determined whether the number of times of receiving the acknowledgement response status report carrying the segment sequence number is greater than or equal to Threshold.

Preferably, the threshold may be set to 2, and if the number of times the acknowledgment response status report carrying the segment sequence number is received is less than 2, it is considered that the currently received ACK status report is that the second device does after the complete reception of the PDU segment. The acknowledgement response is sent, so there is no need to retransmit; if the second device does not completely receive the PDU segment, or the PDU segment is lost, the currently received ACK status report is used to request the first device to be heavy. Pass the PDU segment.

It should be noted that, in actual implementation, the two determinations in step 2031 and step 2032 are not limited to being performed in the above order, and may be first determined according to the acknowledgement response state in the receiving and carrying step 2031 in step 2032. Reporting, determining whether the segment sequence number carried in the acknowledgement response status report is equal to the segment sequence number of the PDU segment waiting to be answered.

Step 2033, if it is determined that the segment sequence number and the segmentation sequence of the PDU segment waiting for response And the PDU segment corresponding to the segment sequence number is sent to the second device.

In this embodiment, it is determined by the first device whether the segment sequence number carried in the received ACK status report is equal to the locally stored segment number of the PDU segment waiting to be acknowledged, and whether the number of ACK reports carrying the segment sequence number is If the threshold is greater than the threshold, it is determined whether the PDU corresponding to the segment sequence number needs to be retransmitted, and the PDU corresponding to the segment sequence number is retransmitted when it is determined that the retransmission is required, thereby improving the data under the condition that the resource is limited. The reliability of the transmission.

FIG. 3 is a flowchart of Embodiment 3 of a data transmission method according to the present invention. The execution body of this embodiment is a second device. As shown in FIG. 3, the method in this embodiment may include:

Step 301: The second device sends a first acknowledgement response status report to the first device, where the first acknowledgement response status report carries a segment sequence number of the packet data unit PDU segment that needs to be retransmitted, for the first device. Determining, according to the first acknowledgement response status report, whether the PDU segment corresponding to the segment sequence number needs to be retransmitted.

The scenario of step 301 is: when the resource of the radio link is seriously insufficient, for example, the terminal is located at the edge of the cell or the area with strong interference, the PDU segment received by the second device is incomplete, or the PDU corresponding to a certain sequence number is not received. When the number of RBs is insufficient to form a NACK status report, the second device can only send a first ACK status report to the first device, where the fragment sequence number of the PDU segment is carried.

The first device may perform the technical solution of the method embodiment shown in FIG. 1 or FIG. 2, and the implementation principles thereof are similar, and details are not described herein again.

Step 302: The second device receives, by the first device, the segment sequence number that is sent by the first device.

The PDU segment, the PDU segment corresponding to the segment sequence number is a PDU segment in which the first device determines that the PDU segment corresponding to the segment sequence number needs to be retransmitted.

In this embodiment, the first device sends the first ACK status report to the first device, and carries the segment sequence number of the packet data unit PDU segment that needs to be retransmitted, so that the first device reports according to the first ACK status. Determining whether the PDU segment corresponding to the segment sequence number needs to be retransmitted; and determining, by the first device, that the PDU segment needs to be retransmitted according to the first ACK status report, to implement support for data transmission under resource limited conditions , improving the reliability of data transmission under resource-constrained conditions, thereby reducing the call drop rate.

Further, based on the foregoing embodiment, the method further includes:

The second device receives the PDU segment sent by the first device, and divides the PDU into The segment sequence number of the segment is carried in the second acknowledgement response status report and sent to the first device.

The scenario of this step is: After receiving the complete PDU segment, the second device sends a second ACK status report to the first device.

In this embodiment, since the second device sends an ACK status report to the first device after receiving the complete PDU segment, the present embodiment uses the first ACK status report representative for clarity of description. The ACK status report in the scenario that needs to be retransmitted, and the second ACK status report is used to represent the ACK status report in the scenario without retransmission.

4 is a signaling flowchart of Embodiment 4 of the data transmission method of the present invention. As shown in FIG. 4, the method in this embodiment may include:

Step 401: The first device sends multiple packet data unit PDU segments to the second device. Step 402: The second device sends an ACK status report to the first device, where the ACK status report carries a segment sequence number of the packet data unit PDU segment that needs to be retransmitted, for the first device to use, according to the first ACK. The status report determines whether the PDU segment corresponding to the segment sequence number needs to be retransmitted.

Specifically, in step 402, the second device may send multiple ACK status reports to the first device, where a part of the ACK status report is an ACK status report sent by the second device in a resource-rich scenario, and another part of the ACK status report is ACK status report sent in the case of insufficient resources.

Step 403: The first device determines, according to the ACK status report, whether a PDU segment corresponding to the segment sequence number needs to be retransmitted. If it is determined that retransmission is required, segment the PDU corresponding to the segment sequence number. Send to the second device.

Step 403 includes the following sub-steps in the specific implementation:

Step 4031: The first device determines, according to the ACK status report, whether the segment sequence number and the segment sequence number of the PDU segment waiting to be answered are equal.

Step 4032: If the first device determines that the segment sequence number is equal to the segment sequence number of the PDU segment waiting to be acknowledged, it is determined whether the number of times the ACK status report carrying the segment sequence number is received is greater than or equal to a threshold. .

It should be noted that, in actual implementation, the two determinations in step 4031 and step 4032 are not limited to being performed in the above order, and the receiving and carrying in step 4032 may be first determined. According to the acknowledgement response status report in step 4031, it is determined whether the segment sequence number and the segment sequence number of the PDU segment waiting for response are equal.

Step 4033: The first device, if it is determined that the number of the segment and the number of PDUs to be answered are greater than or equal to a threshold, send the PDU segment corresponding to the segment sequence number to the second device.

In this embodiment, when determining, by the first device, the ACK status report sent by the second device, determining whether the PDU corresponding to the PDU segment number carried by the ACK status report type needs to be retransmitted, and determining that retransmission is needed The PDU corresponding to the segment sequence number is retransmitted, thereby improving the reliability of data transmission under resource-constrained conditions.

FIG. 5 is a schematic structural diagram of Embodiment 1 of a data transmission apparatus according to the present invention. The apparatus of this embodiment may be integrated in a first device. As shown in FIG. 5, the apparatus in this embodiment may include: a sending module 11, a receiving module 12, and a determining module 13, where the sending module 11 is configured to send a plurality of packet data unit PDU segments to the second device; The acknowledgment response status report is sent by the second device, where the acknowledgment response status report carries the segment sequence number of the PDU segment that needs to be retransmitted, and the determining module 13 is configured to report the acknowledgment response status. Determining whether the PDU segment corresponding to the segment sequence number needs to be retransmitted; the sending module 11 is further configured to: if the determining module 13 determines that retransmission is required, send the PDU segment corresponding to the segment sequence number to The second device.

The device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 1 , and the corresponding function module is implemented. The implementation principle is similar to the embodiment shown in FIG. 1 , and details are not described herein again.

In the apparatus of this embodiment, when the ACK status report is received by the first device, it is determined whether the PDU segment corresponding to the segment sequence number in the ACK status report needs to be retransmitted, and if it is determined that retransmission is required, the segment sequence number is determined. The corresponding PDU segment is sent to the second device to support the successful transmission of data in the scenario that the second device does not receive the PDU but cannot send the NACK report, thereby reducing the risk of data transmission failure and reducing Call drop rate.

Further, on the basis of the embodiment shown in FIG. 5, in a specific implementation, the determining module 13 is specifically configured to determine, according to the acknowledgement response status report, the segment sequence number and the segment of the PDU segment waiting to be acknowledged. Whether the sequence numbers are equal; if it is determined that the segment sequence number is equal to the segment sequence number of the PDU segment waiting to be answered, determining to receive the acknowledgement response status report carrying the segment sequence number The sending module 11 is specifically configured to: if the determining module 13 determines that the segment sequence number and the segment of the PDU segment waiting to be answered, the sequence numbers are equal, and the receiving carries the segment If the number of times of the acknowledgment response status report of the segment number is greater than or equal to the threshold, the PDU segment corresponding to the segment sequence number is sent to the second device.

FIG. 6 is a schematic structural diagram of Embodiment 2 of a data transmission apparatus according to the present invention. The apparatus of this embodiment may be integrated in a second device. As shown in FIG. 6, the apparatus in this embodiment may include: a sending module 21 and a receiving module 22, where the sending module 21 is configured to send a first acknowledgement response status report to the first device, where the first acknowledgement response status report is And carrying the segment sequence number of the packet data unit PDU segment that needs to be retransmitted, so that the first device determines, according to the first acknowledgement response status report, whether the PDU segment corresponding to the segment sequence number needs to be retransmitted; The receiving module 22 is configured to receive a PDU segment corresponding to the segment sequence number sent by the first device, where the PDU segment corresponding to the segment sequence number is determined by the first device to determine the segment sequence number The PDU segment needs to be retransmitted PDU segmentation.

The device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 3, and has a corresponding function module. The implementation principle is similar to the embodiment shown in FIG. 3, and details are not described herein again.

The apparatus of this embodiment sends the first ACK status report to the first device by using the second device, and carries the segment sequence number of the packet data unit PDU segment that needs to be retransmitted, for the first device to use according to the first ACK status. Reporting, determining whether the PDU segment corresponding to the segment sequence number needs to be retransmitted; and determining, by the first device, that the PDU segment needs to be retransmitted according to the first ACK status report, to implement data transmission under resource limited conditions The support improves the reliability of data transmission under resource-constrained conditions, thereby reducing the dropped call rate.

Further, on the basis of the embodiment shown in FIG. 6, in a specific implementation, the receiving module 22 is further configured to receive a PDU segment sent by the first device, and the sending module 21 is further configured to segment the PDU. The segment sequence number is carried in the second acknowledgement response status report and sent to the first device.

FIG. 7 is a schematic structural diagram of an embodiment of a transmitting end according to the present invention. As shown in FIG. 7, the transmitting end of this embodiment includes: a memory 71 and a processor 72, wherein the memory 71 is configured to store an instruction; the processor 72, and the Referring to memory coupling, the processor is configured to execute instructions stored in the memory, and the processor is configured to perform the data transfer method of the embodiment shown in FIG. 1 or 2. The transmitting end of the embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 1 or FIG. 2, and the implementation principle thereof is similar to the embodiment shown in FIG. 1 or FIG. 2, and details are not described herein again.

The transmitting end of the embodiment, when receiving the ACK status report, determines whether the PDU segment corresponding to the segment sequence number in the ACK status report needs to be retransmitted, and if it is determined that retransmission is needed, the segment sequence number is determined. The corresponding PDU segment is sent to the receiving end to support the successful transmission of data in the scenario that the receiving end does not receive the PDU but cannot send the NACK report, thereby reducing the risk of data transmission failure and reducing the call drop rate. .

FIG. 8 is a schematic structural diagram of an embodiment of a receiving end according to the present invention. As shown in FIG. 8, the receiving end of the embodiment includes: a memory 81 and a processor 82, wherein the memory 81 is configured to store an instruction; the processor 82, and the Referring to memory coupling, the processor is configured to execute instructions stored in the memory, and the processor is configured to perform the data transfer method of the embodiment of FIG.

The receiving end of the embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 3, and the implementation principle thereof is similar to the embodiment shown in FIG. 3, and details are not described herein again. The receiving end of the embodiment sends a first ACK status report to the transmitting end by the receiving end, and carries the segment sequence number of the packet data unit PDU segment that needs to be retransmitted, so that the sending end reports according to the first ACK status, and determines Whether the PDU segment corresponding to the segment sequence number needs to be retransmitted; and the sender determines that the PDU segment needs to be retransmitted according to the first ACK status report, thereby implementing support for data transmission under resource limited conditions, and improving The reliability of data transmission under resource-constrained conditions, thereby reducing the call drop rate.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The method includes the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

claims

1. A data transmission method, characterized by including:

The first device sends a plurality of packet data units (PDU segments) to the second device;

The first device receives the acknowledgment response status report sent by the second device, and the acknowledgment response status report carries the segment sequence number of the PDU segment that needs to be retransmitted;

The first device determines, based on the confirmation response status report, the segment number corresponding to

Whether the PDU segment needs to be retransmitted; if it is determined that retransmission is required, then the segment sequence number corresponding to

The PDU segments are sent to the second device.

2. The method according to claim 1, characterized in that the first device determines whether the PDU segment corresponding to the segment sequence number needs to be retransmitted based on the confirmation response status report, including:

The first device determines whether the segment sequence number is equal to the segment sequence number of the PDU segment waiting for a response based on the confirmation response status report;

If the first device determines whether the segment sequence number and the segment of the PDU segment waiting for a response are greater than or equal to a threshold;

Then if it is determined that retransmission is required, the PDU segment corresponding to the segment sequence number is sent to the second device, including:

If it is determined that the segment sequence number is equal to the segment sequence number of the PDU segment waiting for a response, and the number of received acknowledgment response status reports carrying the segment sequence number is greater than or equal to the threshold, then the segment sequence number corresponds to The PDU segments are sent to the second device.

3. A data transmission method, characterized by including:

The second device sends a first acknowledgment response status report to the first device. The first acknowledgment response status report carries the segment sequence number of the packet data unit PDU segment that needs to be retransmitted, so that the first device can perform the processing according to the The first confirmation response status report determines whether the PDU segment corresponding to the segment sequence number needs to be retransmitted;

The second device receives the PDU segment corresponding to the segment sequence number sent by the first device, and the PDU segment corresponding to the segment sequence number is the PDU segment corresponding to the segment sequence number when the first device determines that the segment sequence number corresponds to the PDU segment. PDU segments that require retransmission.

4. The method according to claim 3, further comprising: The second device receives the PDU segment sent by the first device, and carries the segment sequence number of the PDU segment in the second acknowledgment response status report and sends it to the first device.

5. A data transmission device, characterized in that it includes:

A sending module, configured to send multiple packet data unit PDU segments to the second device; A receiving module, configured to receive an acknowledgment response status report sent by the second device, where the acknowledgment response status report carries PDUs that need to be retransmitted. The segment sequence number of the segment;

A judgment module, configured to judge whether the PDU segment corresponding to the segment sequence number needs to be retransmitted based on the acknowledgment response status report;

The sending module is also configured to send the PDU segment corresponding to the segment sequence number to the second device if the judging module determines that retransmission is required.

6. The device according to claim 5, wherein the judgment module is specifically configured to judge whether the segment sequence number is equal to the segment sequence number of the PDU segment waiting for a response according to the confirmation response status report; If it is determined that the segment sequence number is equal to the segment sequence number of the PDU segment waiting for a response, determine whether the number of times of receiving acknowledgment response status reports carrying the segment sequence number is greater than or equal to a threshold;

The sending module is specifically configured to: if the judging module determines that the segment sequence number is equal to the segment sequence number of the PDU segment waiting for a response, and the number of times the confirmation response status report carrying the segment sequence number is received is greater than or is equal to the threshold, then the PDU segment corresponding to the segment sequence number is sent to the second device.

7. A data transmission device, characterized by including:

A sending module, configured to send a first acknowledgment response status report to the first device, where the first acknowledgment response status report carries the segment sequence number of the packet data unit PDU segment that needs to be retransmitted, so that the first device can The first acknowledgment response status report determines whether the PDU segment corresponding to the segment sequence number needs to be retransmitted;

A receiving module, configured to receive the PDU segment corresponding to the segment sequence number sent by the first device, and the PDU segment corresponding to the segment sequence number is the PDU segment corresponding to the segment sequence number when the first device determines that the segment sequence number corresponds to PDU fragmentation PDU fragmentation that requires retransmission.

8. The device according to claim 7, wherein the receiving module is further configured to receive PDU segments sent by the first device;

The sending module is also configured to carry the segment sequence number of the PDU segment in the second acknowledgment response. A status report is sent to the first device.

9. A sending end, characterized in that it includes: a memory for storing instructions; a processor coupled to the memory, the processor is configured to execute instructions stored in the memory, and the processing The device is configured to perform the data transmission method as claimed in claim 1 or 2.

10. A receiving end, characterized in that it includes: a memory for storing instructions; a processor coupled to the memory, the processor is configured to execute instructions stored in the memory, and the processing The device is configured to perform the data transmission method as claimed in claim 3 or 4.