CN111525983A

CN111525983A - Data transmission method and equipment

Info

Publication number: CN111525983A
Application number: CN201910108005.9A
Authority: CN
Inventors: 李娜; 陈卓
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2019-02-02
Filing date: 2019-02-02
Publication date: 2020-08-11
Anticipated expiration: 2039-02-02
Also published as: CN111525983B

Abstract

The invention provides a data transmission method and equipment, which can determine that a data packet adopts a first retransmission mode based on PDCP duplicate transmission or a second retransmission mode based on split DRB according to specific PDCP duplicate transmission conditions.

Description

Data transmission method and equipment

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a data transmission method and equipment.

Background

To improve data transmission efficiency, new wireless (NR) systems propose a split data radio bearer (split DRB) concept. That is, different Data on one Packet Data Convergence Protocol (PDCP) entity can be transmitted in different Cell Groups (CGs) through different RLC entities, so that a faster transmission rate can be achieved.

Meanwhile, in order to ensure the reliability of data transmission, NR also supports a packet data convergence protocol (PDCPduplication) function, as shown in fig. 1, that is, the same data on one PDCP entity can be transmitted and sent on different carriers through different RLC entities, so that the reliability of data transmission can be ensured. When different carriers transmitting the same data belong to the same CG, such PDCP duplication is called carrier aggregation duplication (CA duplication); such PDCP duplication is called dual connectivity duplication (DCduplication) when different carriers transmitting the same data belong to different CGs.

For a certain Data Radio Bearer (DRB), only one of the split DRB function or PDCPduplication function can be supported at present. Both the two functions are configured through Radio Resource Control (RRC) signaling, the Split DRB is activated when the RRC is configured, and the PDCP duty function also requires a media access control layer control element (MAC CE) to be activated after the RRC is configured. Once the split DRB or PDCP duplication function is activated, all data of the DRB needs to be transmitted in the split or duplication manner.

The following problems exist in the prior art: although the PDCP duplication function can improve the reliability of data transmission, the drawback is that all data of the DRB needs to use the PDCP duplication function, that is, the same data is transmitted twice or more, which means that twice or more radio resources are required to transmit the same data, and even if the quality of a radio link between a current terminal (UE, also referred to as user equipment) and a base station is good, the radio resource can be successfully transmitted once, or twice or more radio resources are wasted.

Disclosure of Invention

An object of the embodiments of the present invention is to provide a data transmission method and device, which improve resource utilization efficiency while ensuring data transmission reliability.

The embodiment of the invention provides a data transmission method, which is applied to sending end equipment and comprises the following steps:

determining whether a predetermined Packet Data Convergence Protocol (PDCP) repeat transmission condition is met, wherein the PDCP repeat transmission condition comprises at least one of a first condition and a second condition, and the first condition is that the receiving feedback information of the receiving end equipment indicates that a data packet which is not successfully received exists; the second condition is that the channel quality of the transmission data packet is lower than a preset first threshold;

when the PDCP repeated transmission condition is met, transmitting a target data packet to be repeatedly transmitted according to at least one of the following PDCP retransmission modes: copying a first retransmission mode of the PDCP duplicate based on a packet data convergence protocol; a second retransmission scheme based on a bifurcated data radio bearer split DRB.

An embodiment of the present invention further provides a sending end device, including:

a processor, configured to determine whether a predetermined packet data convergence protocol PDCP duplicate transmission condition is satisfied, where the PDCP duplicate transmission condition includes at least one of a first condition and a second condition, and the first condition is that reception feedback information of a receiving end device indicates that there is an unsuccessfully received data packet; the second condition is that the channel quality of the transmission data packet is lower than a preset first threshold;

a transceiver, configured to send a target data packet to be retransmitted according to at least one of the following PDCP retransmission manners when the PDCP retransmission condition is satisfied: copying a first retransmission mode of the PDCP duplicate based on a packet data convergence protocol; a second retransmission scheme based on a bifurcated data radio bearer split DRB.

An embodiment of the present invention further provides a communication device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the data transmission method as described above.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method are implemented as described above.

The data transmission method and the data transmission equipment provided by the embodiment of the invention determine that the data packet adopts the first retransmission mode based on the PDCP duplicate transmission or the second retransmission mode based on the split DRB according to the specific PDCP duplicate transmission condition, and particularly, the embodiment of the invention can apply the PDCP duplicate function to the data packet needing to be retransmitted only, but not to all data packets of the whole DRB, so that the data packet not needing to be retransmitted is sent in the split DRB mode, and the resource use efficiency is improved while the reliability of data transmission is ensured.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a diagram illustrating a PDCP duplicate transmission scheme in the prior art;

fig. 2 is a schematic diagram of an application scenario of the data transmission method according to the embodiment of the present invention;

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

fig. 4 is a schematic diagram illustrating the interaction of a PDCP status report and an RLC status report between a transmitting end and a receiving end according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating a retransmission based on an RLC status report in an embodiment of the present invention;

FIG. 6 is a diagram illustrating retransmission based on PDCP status report according to an embodiment of the present invention;

FIG. 7 is a second diagram illustrating retransmission based on PDCP status report according to an embodiment of the present invention;

fig. 8 is one of the structural diagrams of a transmitting-end device according to an embodiment of the present invention;

fig. 9 is a second structural diagram of a transmitting end device according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.

The techniques described herein are not limited to Long Time Evolution (LTE)/LTE Evolution (LTE-Advanced) systems, and may also be used for various wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (Wideband code division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation partnership project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes the NR system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications.

The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Referring to fig. 2, fig. 2 is a block diagram of a wireless communication system to which an embodiment of the present invention is applicable. The wireless communication system includes a terminal 11 and a base station 12. The terminal 11 may also be referred to as a user terminal or a User Equipment (UE), where the terminal 11 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device, and the specific type of the terminal 11 is not limited in the embodiment of the present invention. The Base Station 12 may be various Base stations and/or core network elements, wherein the Base stations may be 5G and later-version Base stations (e.g., gNB, 5G NR NB, etc.), or Base stations in other communication systems (e.g., eNB, WLAN access point, or other access points, etc.), wherein the Base Station 12 may be referred to as a node B, an evolved node B, an access point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, it should be noted that, in the embodiment of the present invention, only the Base Station in the NR system is taken as an example, but does not limit the specific type of base station.

The base stations 12 may communicate with the terminals 11 under the control of a base station controller, which may be part of the core network or some of the base stations in various examples. Some base stations may communicate control information or user data with the core network through a backhaul. In some examples, some of the base stations may communicate with each other, directly or indirectly, over backhaul links, which may be wired or wireless communication links. A wireless communication system may support operation on multiple carriers (waveform signals of different frequencies). A multi-carrier transmitter can transmit modulated signals on the multiple carriers simultaneously. For example, each communication link may be a multi-carrier signal modulated according to various radio technologies. Each modulated signal may be transmitted on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, and so on.

Base station 12 may communicate wirelessly with terminal 11 via one or more access point antennas. Each base station may provide communication coverage for a respective coverage area. The coverage area of an access point may be divided into sectors that form only a portion of the coverage area. A wireless communication system may include different types of base stations (e.g., macro, micro, or pico base stations). The base stations may also utilize different radio technologies, such as cellular or WLAN radio access technologies. The base stations may be associated with the same or different access networks or operator deployments. The coverage areas of different base stations (including coverage areas of base stations of the same or different types, coverage areas utilizing the same or different radio technologies, or coverage areas belonging to the same or different access networks) may overlap.

The communication links in a wireless communication system may comprise an Uplink for carrying Uplink (UL) transmissions (e.g., from terminal 11 to base station 12) or a Downlink for carrying Downlink (DL) transmissions (e.g., from base station 12 to terminal 11). The UL transmission may also be referred to as reverse link transmission, while the DL transmission may also be referred to as forward link transmission. Downlink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both. Similarly, uplink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both.

Referring to fig. 3, the data transmission method provided in the embodiment of the present invention, when applied to a terminal side, includes:

step 31, determining whether a predetermined packet data convergence protocol PDCP retransmission condition is satisfied, where the PDCP retransmission condition includes at least one of a first condition and a second condition, and the first condition is that the receiving feedback information of the receiving end device indicates that there is an unsuccessfully received data packet; the second condition is that the channel quality of the transmission data packet is lower than a preset first threshold.

Step 32, when the PDCP retransmission condition is satisfied, sending the target data packet to be retransmitted according to at least one of the following PDCP retransmission methods: copying a first retransmission mode of the PDCP duplicate based on a packet data convergence protocol; a second retransmission scheme based on a bifurcated data radio bearer split DRB.

In the above steps, according to the specific PDCP retransmission condition, the embodiment of the present invention determines that the data packet adopts the first retransmission method based on PDCP duplicate or the second retransmission method based on split DRB, for example, the PDCPduplication function may be applied only to the data packet that needs to be retransmitted, rather than all data packets of the entire DRB, so that the data packet that does not need to be retransmitted is sent in the split DRB, and thus, the reliability of data transmission may be ensured and the resource utilization efficiency may be improved.

In order to facilitate the network side device to perform retransmission control on the terminal device, when the sending end device is a terminal device and the receiving end device is a network side device, before step 31, in the embodiment of the present invention, the sending end device (i.e., the terminal device) may further receive first configuration information of a PDCP sent by the receiving end device (i.e., the network side device), where the first configuration information is used to indicate whether to start a PDCP retransmission for a predetermined data packet, where the predetermined data packet is at least one of the following data packets: PDCP Protocol Data Unit (PDU), PDCP Service Data Unit (SDU).

Correspondingly, when the sending end device is a network side device and the receiving end device is a terminal device, in the embodiment of the present invention, before step 31, the sending end device (i.e., the network side device) sends second configuration information of the PDCP to the receiving end device (i.e., the terminal device), where the second configuration information is used to indicate whether to start PDCP retransmission for the predetermined data packet.

In the embodiment of the present invention, before performing retransmission control on a terminal, a network side device generally needs to acquire a PDCP retransmission capability of a terminal device in advance, for example, whether the terminal device supports the first retransmission method and/or the second retransmission method, so when the sending end device is a terminal device and the receiving end device is a network side device, before step 31, the sending end device (i.e., the terminal device) may report first PDCP retransmission capability information to the receiving end device (i.e., the network side device), where the first PDCP retransmission capability information is used to indicate a PDCP retransmission method supported by the sending end device.

Specifically, when the sending end device only supports the first retransmission mode, the first PDCP retransmission capability information is first indication information for indicating that the sending end device supports the first retransmission mode; when the sending end device only supports the second retransmission mode, the first PDCP retransmission capability information is a second indication information for indicating that the sending end device supports the second retransmission mode; when the sending end device supports the first retransmission mode and the second retransmission mode, the first PDCP retransmission capability information is third indication information for indicating that the sending end device supports the first retransmission mode and the second retransmission mode at the same time, or the first indication information and the second indication information.

Correspondingly, when the sending end device is a network side device and the receiving end device is a terminal device, before the step 31, in the embodiment of the present invention, the sending end device (i.e., the network side device) may receive second PDCP retransmission capability information reported by the receiving end device (i.e., the terminal device), where the second PDCP retransmission capability information is used to indicate a PDCP retransmission mode supported by the receiving end device, so that the sending end device may subsequently perform retransmission control on the sending end device according to retransmission capability supported by the receiving end device.

In this embodiment of the present invention, when the PDCP retransmission condition includes the second condition, in step 31, the sending end device may measure the channel quality to obtain a channel quality measurement result, or receive a channel quality measurement result fed back by the receiving end device; then, according to the channel quality measurement result, whether the channel quality measurement result meets the second condition is judged.

As an implementation manner, in this embodiment of the present invention, when the sending end device supports the first retransmission manner and the second retransmission manner, in step 32, the sending end device may determine, according to the PDCP retransmission condition, a retransmission manner for sending the target data packet, where when the currently satisfied PDCP retransmission condition is the first condition, the retransmission manner is determined as the first retransmission manner; when the currently satisfied PDCP repeated transmission condition is the second condition, determining that a retransmission mode is a second retransmission mode; and then, transmitting the target data packet according to the determined retransmission mode.

As another implementation manner, in this embodiment of the present invention, when the sending end device supports the first retransmission manner and the second retransmission manner, in step 32, the sending end device may determine, according to a channel quality measurement result, a retransmission manner for sending the target data packet, where, when the channel quality is lower than or equal to a preset second threshold, the retransmission manner is determined to be the first retransmission manner; and when the channel quality is higher than the second threshold, determining that the retransmission mode is the second retransmission mode. And then, the sending end equipment sends the target data packet according to the determined retransmission mode.

The second threshold may be configured in advance by the network-side device to the receiving-end device. Therefore, when the sending end device is a terminal device and the receiving end device is a network side device, in the embodiment of the present invention, before step 31, the sending end device may receive first threshold configuration information sent by the receiving end device, where the first threshold configuration information includes the second threshold, so as to obtain the second threshold.

Similarly, when the sending end device is a network side device and the receiving end device is a terminal device, before step 31, in the embodiment of the present invention, the sending end device may send second threshold configuration information to the receiving end device, where the second threshold configuration information includes a third threshold for the receiving end device to determine a channel quality used when determining a retransmission mode. Similarly, the receiving end may measure the channel quality to obtain a channel quality measurement result, or receive a channel quality measurement result fed back by the sending end device, and then determine a retransmission mode for sending the target data packet according to the channel quality measurement result, where when the channel quality is lower than or equal to the third threshold, the retransmission mode is determined to be the first retransmission mode; and when the channel quality is higher than the third threshold, determining that the retransmission mode is a second retransmission mode. Specifically, the second threshold and the third threshold may be equal or different.

In the embodiment of the present invention, the sending-end device may send the target data packet to be repeatedly transmitted according to the first retransmission mode or the second retransmission mode. For example, when the target data packet is sent according to the first retransmission method, the sending end device may copy the target data packet to obtain at least two target data packets; and respectively transmitting one of the at least two target data packets through different Radio Link Control (RLC) entities. For another example, when the target data packet is sent according to the second retransmission method, the sending end device may send the target data packet through a first RLC entity, where the first RLC entity is different from a second RLC entity, and the second RLC entity is an RLC entity that sends the target data packet for the first time.

In addition, in the embodiment of the present invention, before sending the target data packet to be repeatedly transmitted, the target data packet to be repeatedly transmitted may also be determined according to at least one of the following manners:

1) determining a data packet which is not successfully received by the receiving terminal equipment as the target data packet according to the PDCP status report sent by the receiving terminal equipment;

2) determining a data packet which is not successfully received by the receiving terminal equipment as the target data packet according to the RLC status report sent by the receiving terminal equipment;

3) determining the data packet which is not successfully received by the receiving terminal equipment as the target data packet according to the serial number of the data packet which is not successfully received and is sent by the receiving terminal equipment;

4) determining the data packet which is not successfully received by the receiving end equipment as the target data packet according to the segmentation position information of the data packet which is not successfully received and is sent by the receiving end equipment;

5) determining the data packet which is not successfully received by the receiving terminal equipment as the target data packet according to the sequence number range of the data packet which is not successfully received and is sent by the receiving terminal equipment;

6) and determining the data packet starting from the sequence number of the minimum value as the unsuccessfully received data packet according to the minimum value of the sequence numbers of the unsuccessfully received data packets sent by the receiving terminal equipment, and taking the data packet as the target data packet.

Preferably, in the embodiment of the present invention, after the target data packet to be repeatedly transmitted is sent, if receiving feedback information of receiving confirmation of the target data packet by the receiving end device is received, the sending end device may stop sending the target data packet. Here, the reception confirmation feedback information is transmitted after the receiving end device successfully receives the data packet repeatedly transmitted by the transmitting end device.

The above describes how the sending-end device sends the target data packet to be repeatedly transmitted in the embodiment of the present invention. Through the above steps, the embodiment of the present invention may determine, according to the specific PDCP retransmission condition, that the data packet employs the first retransmission method based on the PDCPduplication or the second retransmission method based on the split DRB, and specifically, the embodiment of the present invention may apply the PDCP duplicate function only to the data packet that needs to be retransmitted, rather than to all data packets of the entire DRB, so that the data packet that does not need to be retransmitted is transmitted in the split DRB manner, and thus, the resource utilization efficiency may be improved while the reliability of data transmission is ensured.

The implementation of the above method will be further explained below by specific examples.

S1: the terminal device (hereinafter also referred to as UE) receives a PDCP configuration delivered by a radio network node (hereinafter also referred to as base station), which includes an indication of whether the UE enables PDCP retransmission only for specific data packets.

a) Here, the specific data packet may be one or a combination of:

i. PDCP PDU needing retransmission;

PDCP SDU requiring retransmission;

PDCP PDUs/PDCP SDUs sent when the channel quality is poor (e.g., below some preset second threshold). Here, the channel quality is obtained based on RSRP/RSRQ/SINR. After receiving the indication of poor channel quality, the PDCP starts to use PDCP retransmission for subsequent data packets.

1. For uplink, when the UE is a sending end and the wireless network node is a receiving end, the UE starts to use PDCP (packet data convergence protocol) for retransmission of subsequent data packets when finding that the measured channel quality is smaller than a first threshold (RSRP/RSRQ/SINR threshold) of the channel quality configured by the wireless network node;

2. for downlink, where the radio network node is the transmitting end and the UE is the receiving end, when to start PDCP retransmission may depend on network implementation or on measurement results fed back by the UE.

b) Before this step S1, the UE may also need to report whether the capability of "using PDCP retransmission only for specific data packet" is supported;

c) PDCP retransmissions can include one or a combination of two approaches:

i. retransmission mode based on PDCP duplicate: after being copied, the data needing to be retransmitted is sent by two or more RLC entities. At this time, the indication issued by the base station specifically indicates "retransmission method based on PDCP duplication", and the capability reported by the terminal specifically indicates whether or not "retransmission method based on PDCP duplication" is supported.

Retransmission scheme based on split DRB: when the data transmission on the first RLC entity fails, the retransmitted data is transmitted through other RLC entities. At this time, the indication issued by the base station specifically indicates "the retransmission mode based on the split DRB", and the capability reported by the terminal specifically indicates whether the "retransmission mode based on the split DRB" is supported.

For the above two PDCP retransmissions combining manner, the radio network node may issue:

1. the two indications respectively indicate whether to start a 'retransmission mode based on PDCP replication' and whether to start a 'retransmission mode based on split DRB', and accordingly, the terminal needs to report the two capabilities respectively.

2. An indication of whether to initiate both "PDCP duplicate" and "split DRB" retransmissions simultaneously. The UE selects which method to use based on:

a) different retransmission modes are adopted for different data, for example, a 'retransmission mode based on PDCP duplicate' is used for PDCP PDU/SDU needing retransmission, and a 'retransmission mode based on split DRB' is used for PDCP PDU/SDU sent when the channel quality is poor.

b) Based on the wireless network configuration. The wireless network node issues a second threshold of channel quality, and starts a 'retransmission mode based on split DRB' when an available channel with the channel quality higher than the second threshold exists; otherwise, starting the retransmission mode based on PDCPdupplication.

S2: PDCP retransmission is used for a particular packet when the transmitting end receives one or any combination of the following. Here, the transmitting end may be a UE or a radio network node, and correspondingly, the receiving end may be a radio network node or a UE. The above-mentioned determining manner of the specific data packet needing to be retransmitted may include at least one of the following:

a) as shown in fig. 4, the PDCP entity of the receiving end may transmit a PDCP STATUS report (STATUS PDU). When the PDCP entity at the transmitting end receives the PDCP status report, it can determine which data PDCP SDUs/PDUs need to be retransmitted using PDCP.

b) As shown in fig. 4, an RLC STATUS report (STATUS PDU) may be transmitted by the RLC entity of the receiving end. When a certain transmitting-side RLC entity receives the RLC status report, it needs to indicate which data PDCP PDUs of the transmitting-side PDCP layer need to be retransmitted by PDCP, or which PDCP PDUs have been successfully received (i.e. no PDCP retransmission needs to be used).

c) The receiving end sends a data packet sequence number SN (NACK _ SN) which is not successfully received. The transmitting end uses PDCP retransmission for these data.

d) The segment position (SOstart and/or SOend) of the data packet which is sent by the receiving end and is not successfully received. The transmitting end uses PDCP retransmission for the PDCP PDU/SDU corresponding to the RLC SDU segmentation.

e) The receiving end sends a range of unsuccessfully received packet sequence numbers (NACK range). The transmitting end uses PDCP retransmission for these data.

f) And the receiving end sends the data packet (ACK _ SN) with the lowest unsuccessfully received sequence number SN. The transmitting end uses PDCP retransmission for data within the NACK range indication range from the ACK _ SN.

g) The channel measurement result fed back by the receiving end or the channel measurement result measured by the transmitting end. And when the channel quality of the pre-sent data is lower than the first threshold of the channel quality, the sending end uses the PDCP for retransmission of the subsequent data.

S3: and when the sending end PDCP entity receives the confirmation that any one retransmitted data packet is successfully sent from the RLC entity or the opposite end PDCP entity, indicating other RLC entities to stop retransmitting the data packet.

The first embodiment is as follows: based on RLC status reporting

As shown in fig. 5, in the first embodiment, determining to retransmit a data packet based on an RLC status report specifically includes the following steps:

a) the RLC entity 1 and the RLC entity 2 operate in the split DRB transmission mode, that is, the RLC entity 1 is responsible for transmitting the first part of data from the PDCP entity, and the RLC entity 2 is responsible for transmitting the second part of data from the PDCP entity. The RLC entity 3 is a peer RLC entity of the originating RLC entity 1, and the RLC entity 4 is a peer RLC entity of the originating RLC entity 2.

b) Receiving end RLC entity 3 indicates through RLC status reportRLC SDU#3It cannot be successfully received.

c) The sending RLC entity 1 receives the RLC status report of the receiving RLC entity 3 and indicates that the sending PDCP entity RLC sdu #3 cannot be successfully received.

d) The originating PDCP entity deduces thatPDCP SDU#5(RLC SDU #3, as deemed by the RLC entity), cannot be successfully received, and therefore, PDCP duplicate retransmission is initiated for PDCP SDU # 5. This retransmission is the first PDCP UPPLICATION retransmission of PDCP SDU 5.

e) PDCP SDU #5 is re-encapsulated into PDCP PDU #8 and PDCP PDU #20, which are sent to RLC entity 1 and RLC entity 2, respectively, for transmission.

f) The

RLC entities

1 and 2 encapsulate the PDCP PDU #8 and the PDCP PDU #20 intoRLC PDU#20AndRLC PDU#38ARQ retransmission is performed.

g) When the RLC entity 2 receives the acknowledgement of successful RLC PDU #38 reception from the RLC entity 4, it indicates to the sending PDCP entity that the PDCP PDU #20 was successfully received.

h) The PDCP entity deduces that PDCP SDU #5 was successfully received by the receiving end and indicates that RLC entity 1 does not retransmit PDCP pdu # 8.

Example two: PDCP-based status reporting

As shown in fig. 6 to 7, in the second embodiment, determining the retransmission data packet based on the PDCP status report specifically includes the following steps:

the RLC entity 1 and the RLC entity 2 operate in the split DRB transmission mode, i.e. the RLC entity 1 is responsible for transmitting the first part of data from the PDCP entity and the RLC entity 2 is responsible for transmitting the second part of data from the PDCP entity. The RLC entity 3 is a peer RLC entity of the originating RLC entity 1, and the RLC entity 4 is a peer RLC entity of the originating RLC entity 2.

The receiving side PDCP entity indicates the transmitting side PDCP entity through the PDCP status report that the PDCP PDU #20 was not successfully received. The sending PDCP entity deduces that PDCP SDU #3 could not be successfully received, and triggers the first PDCP duty retransmission for PDCP SDU # 3.

The sending PDCP entity repackages PDCP SDU #3 into PDCP PDU #33 and PDCP PDU #50 to the RLC entity 1 and RLC entity 2 for ARQ retransmission.

Subsequently, the sending side PDCP entity receives a PDCP status report of the receiving side PDCP entity, and indicates that both PDCP PDU #33 and PDCP PDU #50 are not successfully received. Supposing that PDCP SDU #3 could not be successfully received, a second PDCP duty retransmission for PDCP SDU #3 is triggered. The re-encapsulated packets are PDCP PDU #48 and PDCP PDU #66, respectively.

v. when any one of the PDCP PDU #48 and the PDCP PDU #66 fed back by the receiving end is received successfully, stopping retransmission.

Various methods of embodiments of the present invention have been described above. An apparatus for carrying out the above method is further provided below.

An embodiment of the present invention provides a sending-end device shown in fig. 8. Referring to fig. 8, an embodiment of the present invention provides a sending-end device 80, including:

a processor 81, configured to determine whether a predetermined packet data convergence protocol PDCP duplicate transmission condition is satisfied, where the PDCP duplicate transmission condition includes at least one of a first condition and a second condition, and the first condition is that reception feedback information of a receiving end device indicates that there is an unsuccessfully received data packet; the second condition is that the channel quality of the transmission data packet is lower than a preset first threshold;

a transceiver 82, configured to send a target data packet to be retransmitted according to at least one of the following PDCP retransmission manners when the PDCP retransmission condition is satisfied: copying a first retransmission mode of the PDCP duplicate based on a packet data convergence protocol; a second retransmission scheme based on a bifurcated data radio bearer split DRB.

Preferably, when the sending end device is a terminal device and the receiving end device is a network side device,

the transceiver 82 is further configured to receive first configuration information of a packet data convergence protocol PDCP sent by the receiving end device before determining whether the PDCP repeat transmission condition is satisfied, where the first configuration information is used to indicate whether to start PDCP retransmission for a predetermined data packet, and the predetermined data packet is at least one of the following data packets: PDCP protocol data unit PDU, PDCP service data unit SDU.

Preferably, when the sending end device is a network side device and the receiving end device is a terminal device,

the transceiver 82 is further configured to send second configuration information of a packet data convergence protocol PDCP to the receiving end device before determining whether the PDCP duplicate transmission condition is satisfied, where the second configuration information is used to indicate whether to start PDCP retransmission for a predetermined data packet, and the predetermined data packet is at least one of the following data packets: PDCP protocol data unit PDU, PDCP service data unit SDU.

the transceiver 82 is further configured to report first PDCP retransmission capability information to the receiving end device before receiving the PDCP configuration information, where the first PDCP retransmission capability information is used to indicate a PDCP retransmission mode supported by the sending end device.

Preferably, when the sending end device only supports the first retransmission mode, the first PDCP retransmission capability information is first indication information for indicating that the sending end device supports the first retransmission mode;

when the sending end device only supports the second retransmission mode, the first PDCP retransmission capability information is a second indication information for indicating that the sending end device supports the second retransmission mode;

when the sending end device supports the first retransmission mode and the second retransmission mode, the first PDCP retransmission capability information is third indication information for indicating that the sending end device supports the first retransmission mode and the second retransmission mode at the same time, or the first indication information and the second indication information.

the transceiver 82 is further configured to receive second PDCP retransmission capability information reported by the receiving end device before receiving the PDCP configuration information, where the second PDCP retransmission capability information is used to indicate a PDCP retransmission mode supported by the receiving end device.

Preferably, the processor 81 is further configured to measure the channel quality and obtain a channel quality measurement result when the PDCP retransmission condition includes the second condition, or receive a channel quality measurement result fed back by the receiving end device; and judging whether the channel quality measurement result meets the second condition.

Preferably, when the sending end device supports the first retransmission method and the second retransmission method,

the transceiver 82 is further configured to determine a retransmission method for sending the target data packet according to the PDCP retransmission condition, where the retransmission method is determined to be a first retransmission method when the currently satisfied PDCP retransmission condition is the first condition; when the currently satisfied PDCP repeated transmission condition is the second condition, determining that a retransmission mode is a second retransmission mode; and transmitting the target data packet according to the determined retransmission mode.

the transceiver 82 is further configured to determine a retransmission mode for sending the target data packet according to a channel quality measurement result, where when the channel quality is lower than or equal to a preset second threshold, the retransmission mode is determined to be a first retransmission mode; and when the channel quality is higher than the second threshold, determining that the retransmission mode is the second retransmission mode.

the transceiver 82 is further configured to receive first threshold configuration information sent by the receiving end device before determining whether the PDCP retransmission condition is satisfied, where the first threshold configuration information includes the second threshold.

the transceiver 82 is further configured to send second threshold configuration information to the receiving end device before determining whether the PDCP repeat transmission condition is satisfied, where the second threshold configuration information includes a third threshold used for channel quality used when the receiving end device determines a retransmission mode.

Preferably, the transceiver 82 is further configured to:

when the target data packet is sent according to the first retransmission mode, copying the target data packet to obtain at least two target data packets; respectively sending one of the at least two target data packets through different Radio Link Control (RLC) entities;

and when the target data packet is sent according to the second retransmission mode, sending the target data packet through a first RLC entity, wherein the first RLC entity is different from a second RLC entity, and the second RLC entity is the RLC entity which sends the target data packet for the first time.

Preferably, the processor 81 is further configured to determine the target data packet to be repeatedly transmitted according to at least one of the following manners before the transceiver sends the target data packet to be repeatedly transmitted:

determining a data packet which is not successfully received by the receiving terminal equipment as the target data packet according to the PDCP status report sent by the receiving terminal equipment;

determining a data packet which is not successfully received by the receiving terminal equipment as the target data packet according to the RLC status report sent by the receiving terminal equipment;

determining the data packet which is not successfully received by the receiving terminal equipment as the target data packet according to the serial number of the data packet which is not successfully received and is sent by the receiving terminal equipment;

determining the data packet which is not successfully received by the receiving end equipment as the target data packet according to the segmentation position information of the data packet which is not successfully received and is sent by the receiving end equipment;

determining the data packet which is not successfully received by the receiving terminal equipment as the target data packet according to the sequence number range of the data packet which is not successfully received and is sent by the receiving terminal equipment;

and determining the data packet starting from the sequence number of the minimum value as the unsuccessfully received data packet according to the minimum value of the sequence numbers of the unsuccessfully received data packets sent by the receiving terminal equipment, and taking the data packet as the target data packet.

Preferably, the processor 81 is further configured to, after the transceiver sends a target data packet to be repeatedly transmitted, stop sending the target data packet if receiving acknowledgement feedback information of the receiving end device for the target data packet is received, where the receiving acknowledgement feedback information is sent after the receiving end device successfully receives a data packet repeatedly sent by the sending end device.

Referring to fig. 9, an embodiment of the present invention provides another schematic structural diagram of a sending-end device 900, including: a processor 901, a transceiver 902, a memory 903, and a bus interface, wherein:

the processor 901 is configured to read a program in the memory, and execute the following processes: determining whether a predetermined Packet Data Convergence Protocol (PDCP) repeat transmission condition is met, wherein the PDCP repeat transmission condition comprises at least one of a first condition and a second condition, and the first condition is that the receiving feedback information of the receiving end equipment indicates that a data packet which is not successfully received exists; the second condition is that the channel quality of the transmission data packet is lower than a preset first threshold;

the transceiver 902 is configured to send a target data packet to be retransmitted according to at least one of the following PDCP retransmission manners when the PDCP retransmission condition is satisfied: copying a first retransmission mode of the PDCP duplicate based on a packet data convergence protocol; a second retransmission scheme based on a bifurcated data radio bearer split DRB.

In fig. 9, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 901 and various circuits of memory represented by memory 903 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 902 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 901 is responsible for managing a bus architecture and general processing, and the memory 903 may store data used by the processor 901 in performing operations.

the transceiver 902 is further configured to receive first configuration information of a packet data convergence protocol PDCP sent by the receiving end device before determining whether the PDCP duplicate transmission condition is satisfied, where the first configuration information is used to indicate whether to start PDCP retransmission for a predetermined data packet, and the predetermined data packet is at least one of the following data packets: PDCP protocol data unit PDU, PDCP service data unit SDU.

the transceiver 902 is further configured to send second configuration information of a packet data convergence protocol PDCP to the receiving end device before determining whether the PDCP duplicate transmission condition is satisfied, where the second configuration information is used to indicate whether to start PDCP retransmission for a predetermined data packet, and the predetermined data packet is at least one of the following data packets: PDCP protocol data unit PDU, PDCP service data unit SDU.

the transceiver 902 is further configured to report first PDCP retransmission capability information to the receiving end device before receiving the PDCP configuration information, where the first PDCP retransmission capability information is used to indicate a PDCP retransmission mode supported by the sending end device.

the transceiver 902 is further configured to receive, before receiving the PDCP configuration information, second PDCP retransmission capability information reported by the receiving end device, where the second PDCP retransmission capability information is used to indicate a PDCP retransmission mode supported by the receiving end device.

Preferably, the processor 901 is further configured to read a program in the memory, and execute the following processes: when the PDCP repeated transmission condition includes the second condition, measuring a channel quality to obtain a channel quality measurement result, or receiving a channel quality measurement result fed back by the receiving end device; and judging whether the channel quality measurement result meets the second condition.

the transceiver 902 is further configured to determine a retransmission method for sending the target data packet according to the PDCP retransmission condition, where the retransmission method is determined to be a first retransmission method when the currently satisfied PDCP retransmission condition is the first condition; when the currently satisfied PDCP repeated transmission condition is the second condition, determining that a retransmission mode is a second retransmission mode; and transmitting the target data packet according to the determined retransmission mode.

the transceiver 902 is further configured to determine a retransmission method for sending the target data packet according to a channel quality measurement result, where when the channel quality is lower than or equal to a preset second threshold, the retransmission method is determined to be a first retransmission method; and when the channel quality is higher than the second threshold, determining that the retransmission mode is the second retransmission mode.

the transceiver 902 is further configured to receive first threshold configuration information sent by the receiving end device before determining whether the PDCP retransmission condition is satisfied, where the first threshold configuration information includes the second threshold.

the transceiver 902 is further configured to send second threshold configuration information to the receiving end device before determining whether the PDCP retransmission condition is satisfied, where the second threshold configuration information includes a third threshold for channel quality used when the receiving end device determines a retransmission method.

Preferably, the transceiver 902 is further configured to:

Preferably, the processor 901 is further configured to read a program in the memory, and execute the following processes: before the transceiver sends the target data packet to be transmitted repeatedly, determining the target data packet to be transmitted repeatedly according to at least one of the following modes:

Preferably, the processor 901 is further configured to read a program in the memory, and execute the following processes: after the transceiver sends a target data packet to be transmitted repeatedly, if receiving confirmation feedback information of the receiving end equipment to the target data packet is received, the transceiver stops sending the target data packet, and the receiving confirmation feedback information is sent after the receiving end equipment successfully receives the data packet sent repeatedly by the sending end equipment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A data transmission method is applied to sending terminal equipment and is characterized by comprising the following steps:

2. The method of claim 1, wherein when the sending end device is a terminal device and the receiving end device is a network side device, before determining whether the PDCP retransmission condition is satisfied, the method further comprises:

receiving first configuration information of a Packet Data Convergence Protocol (PDCP) sent by the receiving terminal equipment, wherein the first configuration information is used for indicating whether to start PDCP retransmission aiming at a predetermined data packet, and the predetermined data packet is at least one of the following data packets: PDCP protocol data unit PDU, PDCP service data unit SDU.

3. The method of claim 1, wherein before determining whether the PDCP retransmission condition is satisfied when the sending end device is a network side device and the receiving end device is a terminal device, the method further comprises:

sending second configuration information of a Packet Data Convergence Protocol (PDCP) to the receiving terminal equipment, wherein the second configuration information is used for indicating whether to start PDCP retransmission aiming at a predetermined data packet, and the predetermined data packet is at least one of the following data packets: PDCP protocol data unit PDU, PDCP service data unit SDU.

4. The method of claim 1, wherein when the sending end device is a terminal device and the receiving end device is a network side device, before receiving the PDCP configuration information, the method further comprises:

and reporting first PDCP repeat transmission capability information to the receiving terminal equipment, wherein the first PDCP repeat transmission capability information is used for indicating the PDCP retransmission modes supported by the sending terminal equipment.

5. The method of claim 4,

when the sending end device only supports the first retransmission mode, the first PDCP retransmission capability information is first indication information for indicating that the sending end device supports the first retransmission mode;

6. The method of claim 1, wherein when the sending end device is a network side device and the receiving end device is a terminal device, before receiving the PDCP configuration information, the method further comprises:

and receiving second PDCP retransmission capability information reported by the receiving end device, where the second PDCP retransmission capability information is used to indicate a PDCP retransmission mode supported by the receiving end device.

7. The method of claim 1, wherein when the PDCP repeat transmission condition comprises the second condition, the step of determining whether a predetermined packet data convergence protocol PDCP repeat transmission condition is satisfied comprises:

measuring the channel quality to obtain a channel quality measurement result, or receiving the channel quality measurement result fed back by the receiving end equipment;

and judging whether the channel quality measurement result meets the second condition.

8. The method of claim 1, wherein the step of sending the target data packet to be repeatedly transmitted when the sending end device supports the first retransmission scheme and the second retransmission scheme comprises:

determining a retransmission mode for sending the target data packet according to the PDCP repeated transmission condition, wherein when the PDCP repeated transmission condition which is met currently is the first condition, the retransmission mode is determined to be a first retransmission mode; when the currently satisfied PDCP repeated transmission condition is the second condition, determining that a retransmission mode is a second retransmission mode;

and transmitting the target data packet according to the determined retransmission mode.

9. The method of claim 1, wherein the step of sending the target data packet to be repeatedly transmitted when the sending end device supports the first retransmission scheme and the second retransmission scheme comprises:

determining a retransmission mode for sending the target data packet according to a channel quality measurement result, wherein when the channel quality is lower than or equal to a preset second threshold, the retransmission mode is determined to be a first retransmission mode; and when the channel quality is higher than the second threshold, determining that the retransmission mode is the second retransmission mode.

10. The method of claim 9, wherein when the sending end device is a terminal device and the receiving end device is a network side device, before determining whether the PDCP retransmission condition is satisfied, the method further comprises: and receiving first threshold configuration information sent by the receiving end equipment, wherein the first threshold configuration information comprises the second threshold.

11. The method of claim 9, wherein when the sending end device is a network side device and the receiving end device is a terminal device, before determining whether the PDCP retransmission condition is satisfied, the method further comprises: and sending second threshold configuration information to the receiving end equipment, wherein the second threshold configuration information comprises a third threshold used for channel quality used when the receiving end equipment determines a retransmission mode.

12. The method of claim 1,

when the target data packet is sent according to the first retransmission mode, the sending end equipment copies the target data packet to obtain at least two target data packets; respectively sending one of the at least two target data packets through different Radio Link Control (RLC) entities;

and when the target data packet is sent according to the second retransmission mode, the sending end equipment sends the target data packet through a first RLC entity, wherein the first RLC entity is different from a second RLC entity, and the second RLC entity is the RLC entity which sends the target data packet for the first time.

13. The method of claim 1, wherein prior to said sending the target data packet to be retransmitted, the method further comprises:

determining a target data packet to be transmitted repeatedly according to at least one of the following modes:

14. The method of claim 1, wherein after the step of sending the target data packet to be repeatedly transmitted, the method further comprises:

and if receiving confirmation feedback information of the receiving end equipment to the target data packet is received, stopping sending the target data packet, wherein the receiving confirmation feedback information is sent after the receiving end equipment successfully receives the data packet repeatedly sent by the sending end equipment.

15. A transmitting-end device, comprising:

16. The sender device of claim 15, wherein when the sender device is a terminal device and the receiver device is a network side device,

the transceiver is further configured to receive first configuration information of a packet data convergence protocol PDCP sent by the receiving end device before determining whether a PDCP duplicate transmission condition is satisfied, where the first configuration information is used to indicate whether to start PDCP retransmission for a predetermined data packet, and the predetermined data packet is at least one of the following data packets: PDCP protocol data unit PDU, PDCP service data unit SDU.

17. The sender device of claim 15, wherein when the sender device is a network side device and the receiver device is a terminal device,

the transceiver is further configured to send second configuration information of a packet data convergence protocol PDCP to the receiving end device before determining whether the PDCP duplicate transmission condition is satisfied, where the second configuration information is used to indicate whether to start PDCP retransmission for a predetermined data packet, and the predetermined data packet is at least one of the following data packets: PDCP protocol data unit PDU, PDCP service data unit SDU.

18. The sender device of claim 15, wherein when the sender device is a terminal device and the receiver device is a network side device,

the transceiver is further configured to report first PDCP retransmission capability information to the receiving end device before receiving the PDCP configuration information, where the first PDCP retransmission capability information is used to indicate a PDCP retransmission mode supported by the transmitting end device.

19. The sender device of claim 18,

20. The sender device of claim 15, wherein when the sender device is a network side device and the receiver device is a terminal device,

the transceiver is further configured to receive second PDCP retransmission capability information reported by the receiving end device before receiving the PDCP configuration information, where the second PDCP retransmission capability information is used to indicate a PDCP retransmission mode supported by the receiving end device.

21. The sender device of claim 15,

the processor is further configured to measure a channel quality and obtain a channel quality measurement result when the PDCP retransmission condition includes the second condition, or receive a channel quality measurement result fed back by the receiving end device; and judging whether the channel quality measurement result meets the second condition.

22. The transmitting device of claim 15, wherein when the transmitting device supports the first retransmission scheme and the second retransmission scheme,

the transceiver is further configured to determine a retransmission mode for sending the target data packet according to the PDCP retransmission condition, where the retransmission mode is determined to be a first retransmission mode when the currently satisfied PDCP retransmission condition is the first condition; when the currently satisfied PDCP repeated transmission condition is the second condition, determining that a retransmission mode is a second retransmission mode; and transmitting the target data packet according to the determined retransmission mode.

23. The transmitting device of claim 15, wherein when the transmitting device supports the first retransmission scheme and the second retransmission scheme,

the transceiver is further configured to determine a retransmission mode for transmitting the target data packet according to a channel quality measurement result, where the retransmission mode is determined to be a first retransmission mode when the channel quality is lower than or equal to a preset second threshold; and when the channel quality is higher than the second threshold, determining that the retransmission mode is the second retransmission mode.

24. The sender device of claim 23, wherein when the sender device is a terminal device and the receiver device is a network side device,

the transceiver is further configured to receive first threshold configuration information sent by the receiving end device before determining whether the PDCP retransmission condition is satisfied, where the first threshold configuration information includes the second threshold.

25. The sender device of claim 23, wherein when the sender device is a network side device and the receiver device is a terminal device,

the transceiver is further configured to send second threshold configuration information to the receiving end device before determining whether the PDCP retransmission condition is satisfied, where the second threshold configuration information includes a third threshold for channel quality used when the receiving end device determines a retransmission mode.

26. The sender device of claim 15,

the transceiver is further configured to:

27. The sender device of claim 15,

the processor is further configured to determine, before the transceiver sends the target data packet to be repeatedly transmitted, the target data packet to be repeatedly transmitted according to at least one of the following manners:

28. The sender device of claim 15,

the processor is further configured to, after the transceiver sends a target data packet to be repeatedly transmitted, stop sending the target data packet if receiving acknowledgement feedback information of the receiving end device to the target data packet is received, where the receiving acknowledgement feedback information is sent after the receiving end device successfully receives a data packet repeatedly sent by the sending end device.

29. A communication device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the data transmission method according to any one of claims 1 to 14.

30. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the data transmission method according to one of claims 1 to 14.