CN114598661A

CN114598661A - Data transmission method, device, related equipment and storage medium

Info

Publication number: CN114598661A
Application number: CN202011437081.3A
Authority: CN
Inventors: 孙军帅; 王莹莹; 李娜; 赵芸; 邓娟; 刘光毅
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: 2020-12-07
Filing date: 2020-12-07
Publication date: 2022-06-07

Abstract

The application discloses a data transmission method, a data transmission device, sending end equipment, receiving end equipment and a storage medium. The method comprises the following steps: sending end equipment sends a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity of the third sending end equipment layer; the first functional entity is connected with at least one second functional entity of the second sending end device layer; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

Description

Data transmission method, device, related equipment and storage medium

Technical Field

The present application relates to the field of wireless communications, and in particular, to a data transmission method, apparatus, related device, and storage medium.

Background

Aiming at the design target of the ultra-simple Network (Lite Network) of the next generation mobile communication, it is proposed to introduce a User Plane (UP) function (also referred to as a data Plane function) in Layer three (L3, Layer 3) for data processing. After introducing the UP protocol layer of L3, the UP protocol layer of L3 has a data sorting function to ensure that the data packets are delivered to the upper layer in sequence.

In order to achieve ordering and in-order distribution of the data packets, each data packet needs to be assigned a Sequence Number (SN). However, in the related art, the SN is not an entire byte in length, which increases the complexity of packet processing.

Disclosure of Invention

In order to solve the related technical problems, embodiments of the present application provide a data transmission method, an apparatus, related devices, and a storage medium.

The technical scheme of the embodiment of the application is realized as follows:

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

sending a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at the sending end device L3; the first functional entity is connected with at least one second functional entity of the second sending-end equipment Layer (L2, Layer 2); the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

In the above scheme, the first part represents a starting value of a sequence number of a data packet sent by the first functional entity to a second functional entity corresponding to a link; the second portion characterizes an offset value of the data packet with respect to a starting value of the sequence number on the corresponding second functional entity.

In the foregoing scheme, the determining includes at least one of:

production and/or resetting of a data packet sequence number;

selecting an initial value of a data packet sequence number;

an increase or decrease in the number of data packet sequences;

use of packet sequence numbers in packet ordering.

In the above scheme, the first functional entity selects at least one link for transmitting data, and each link at least represents a connection between the first functional entity and a second functional entity;

the data packets are transmitted using at least one link.

In the above scheme, the first functional entity selects at least two links for transmitting data; the method further comprises the following steps:

before transmitting a data packet of a link, the first functional entity transmits first information; the first information indicates that a packet of one link starts to be transmitted.

In the above solution, the sending, by the first functional entity, the first information includes:

and the first functional entity sends a Protocol Data Unit (PDU), and the PDU carries the first information.

In the foregoing solution, the method further includes:

after the data packet of one link is sent, the first functional entity sends second information; the second information indicates that the data packet transmission of the corresponding link is finished.

In the foregoing solution, the sending, by the first functional entity, the second information includes:

and the first functional entity sends PDU, and the PDU carries the second information.

The embodiment of the present application further provides a data transmission method, which is applied to a receiving end device, and includes:

receiving a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequential relationship of the data packets is determined by a first functional entity of the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

In the above solution, the first part represents an initial value of a sequence number of a data packet that the first functional entity sends to a second functional entity corresponding to a link; the second portion characterizes an offset value of the data packet with respect to a starting value of the sequence number on the corresponding second functional entity.

In the above scheme, at least one link is used for receiving data; each link characterizes at least a connection between a first functional entity of the sink device L3 and one second functional entity of the sink device L2.

In the above scheme, at least two links are used for receiving data; the method further comprises the following steps:

a first functional entity of the receiving end equipment receives first information; the first information indicates that a packet of one link starts to be transmitted.

In the above solution, the receiving, by the first functional entity of the receiving end device, the first information includes:

and the first functional entity of the receiving terminal equipment receives the PDU, wherein the PDU carries the first information.

In the above scheme, the method further comprises:

a first functional entity of the receiving end equipment receives second information; the second information indicates that the data packet transmission of the corresponding link is finished.

In the foregoing solution, the receiving, by the first functional entity of the receiving end device, the second information includes:

and the first functional entity of the receiving terminal equipment receives the PDU, wherein the PDU carries the second information.

The embodiment of the present application further provides a data transmission apparatus, which is arranged on the sending end device, and includes: a first functional entity unit and a second functional entity unit; wherein the content of the first and second substances,

the first functional entity unit and the second functional entity unit are used for sending data packets; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequential relationship of the data packets is determined by a first functional entity unit of the sending end device L3; the first functional entity unit is connected with at least one second functional entity unit of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least represents the connection of the first functional entity unit and a second functional entity unit; the second part represents the transmission sequence of the data packets on a second functional entity unit corresponding to a link.

The embodiment of the present application further provides a data transmission apparatus, which is arranged on the receiving end device, and includes: a first functional entity unit and a second functional entity unit; wherein the content of the first and second substances,

the first functional entity unit and the second functional entity unit are used for receiving data packets; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequential relationship of the data packets is determined by a first functional entity of the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

The embodiment of the present application further provides a sending end device, including: a first communication interface and a first processor; wherein, the first and the second end of the pipe are connected with each other,

the first communication interface is used for sending data packets; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

The embodiment of the present application further provides a receiving end device, including: a second communication interface and a second processor; wherein the content of the first and second substances,

the second communication interface is used for receiving a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequential relationship of the data packets is determined by a first functional entity of the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

The embodiment of the present application further provides a sending end device, including: a first processor and a first memory for storing a computer program capable of running on the processor,

wherein the first processor is configured to execute the steps of any one of the methods at the transmitting end device side when the computer program is executed.

The embodiment of the present application further provides a receiving end device, including: a second processor and a second memory for storing a computer program capable of running on the processor,

wherein the second processor is configured to execute the steps of any one of the methods of the receiving end device side when the computer program is executed.

An embodiment of the present application further provides a storage medium, where a computer program is stored, and when executed by a processor, the computer program implements the steps of any method on the transmitting-end device side, or implements the steps of any method on the receiving-end device side.

According to the data transmission method, the data transmission device, the related equipment and the storage medium, the sending end equipment sends the data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part represents the transmission sequence of the data packets on a second functional entity corresponding to a link; and the receiving end equipment receives the data packet sent by the sending end equipment. According to the scheme of the embodiment of the application, the data packet transmitted on the end-to-end L3UP link is decomposed into the L3 functional entity part and the L2 functional entity part connected with the L3 functional entity, so that the short SN data packet can be transmitted and received, and the data packet overhead is reduced.

Drawings

Fig. 1 is a schematic diagram of connection of an L3UP entity with a plurality of MAC functional entities;

FIG. 2 is a flowchart illustrating a method for data transmission according to an embodiment of the present application;

FIG. 3 is a diagram illustrating an example of SN allocation by the L3UP entity according to the present application;

FIG. 4 is a diagram illustrating a control PDU format according to an exemplary embodiment of the present application;

fig. 5 is a schematic structural diagram of a data transmission device according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a sending end device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a receiving end device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a data transmission system according to an embodiment of the present application.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples.

Facing the design goal of Lite Network of next generation mobile communication, it is proposed to introduce an UP protocol layer at L3 for data processing, and whether or not other protocol entities exist in L2 (in fifth generation mobile communication technology (5G), L2 includes four protocol layers (also referred to as protocol sub-layers), namely, Service Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP), radio link layer control (RLC), and MAC), each protocol layer corresponds to a corresponding protocol entity (also referred to as a protocol functional entity)), and the UP protocol entity of the UP protocol layer of L3 is directly connected to the MAC protocol entity of L2.

In the third generation mobile communication technology (3G), the fourth generation mobile communication technology (4G) and the 5G system, at the terminal side, only the Control Plane (CP) function, i.e. only the RRC protocol layer, is located in the Access Stratum (AS); correspondingly, on the network side, there is also only a CP function, i.e. only the RRC protocol layer, in the Radio Access Network (RAN). The RRC protocol layer completes the radio resource control function and has no data processing function of the UP protocol layer. In the L3 of the AS and the RAN (in the 5G system, the RRC layers of the AS and the RAN are referred to AS a 3-layer protocol), the UP function may be introduced, that is, an L3UP protocol layer (also referred to AS an L3UP protocol entity or an L3UP entity) is introduced, which is referred to AS an L3UP entity in the following description.

The L3UP entity has a data sorting function and ensures that the data packets are delivered to the upper layer in sequence. When one L3UP entity is connected with a plurality of L2 functional entities simultaneously, the L3UP entity needs to sort the data submitted by a plurality of L2 entities; and the data packets need to be distributed among different L2 entities. Illustratively, as shown in fig. 1, the L3UP entity is directly connected to the MAC functional entity of L2 through IP Flow, that is, the bearer between the L3UP entity and the MAC functional entity is IP Flow, that is, a logical channel carrying the corresponding IP. Transmitted on each IP Flow are IP packets. In order for the L3UP entity to achieve ordering and in-order distribution of packets, each packet needs to be assigned a SN. In a manner that the conventional PDCP functional entity in 5G defines the SN, the length of the SN is two bytes (12 bits or 18 bits). Where SN is 12 bits or 18 bits instead of a whole byte (e.g., 8bits, 16 bits, 24 bits, 32 bits, etc.), because: the time delay between the PDCP functional entity of the receiving end and the PDCP functional entity of the transmitting end causes the need of a long sequencing window, and the SN of the PDCP is directly related to the length of the sequencing window (the length of the sequencing window is 1/2 of the maximum SN); if the whole byte SV is used, the SN of the whole byte is too short, which results in too small a sorting window, and if the SN of the whole byte is too long, which results in too large a sorting window, which results in waste.

Such non-full byte SN needs to be sorted in combination with Hyper Frame Number (HFN), thus increasing the complexity of packet processing.

Based on this, in various embodiments of the present application, by decomposing SNs on the entire link, i.e., the end-to-end L3UP link, into an L3UP portion and functional entity portions (such as MAC functional entity) each connected to L2 with an L3UP functional entity, transceiving short SN data packets is achieved, which both reduces the overhead of data packets and achieves flexible definition of SNs.

sending a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

In practical application, the sending end device may be a network device (specifically, a base station), and the receiving end device may be a terminal; the sending end device may also be a terminal, and correspondingly, the receiving end device may be a network device.

The sequential relationship of the data packets is determined by the first functional entity of the sender device L3, in other words, the sequential relationship of the data packets is maintained on the first functional entity of the sender device L3.

Wherein the determination or maintenance can also be understood as an operation; specifically, the sequential relationship of the data packets is determined by the first functional entity at the sender device L3, and it can be understood that the operation of the sequential relationship of the data packets is on the first functional entity of the sender device L3. In practical applications, the sequence relationship of the data packets may also be referred to as an ordered sequence of the data packets, i.e. the data packet SN.

Here, the determining or maintaining may include at least one of:

production and/or resetting of the data packet SN;

selecting an initial value of the SN of the data packet;

an increase or decrease in the data packet SN (i.e., an increase or decrease in SN);

use of the data packet SN in the data packet ordering.

Wherein the resetting of the data packet SN may include: the data packet SN is reset to an initial value.

The increase of the data packet SN means: for data to be sent, the value of the SN of the corresponding data packet is obtained in a small-to-large manner, that is, the value of the SN of each data packet is obtained in an accumulation manner; accordingly, the reduction of the data packet SN means: for data to be transmitted, the SN value of the corresponding data packet is obtained from large to small, that is, the SN value of each data packet is obtained by means of accumulation.

The use of the data packet SN in the data packet ordering may include: ordering in order (such as ordering of adjacent SNs), discarding or recovering of SNs, and the like.

In practical application, when the connection mode between the first functional entity and the second functional entity shown in fig. 1 is adopted, the first functional entity needs to select a link for transmitting data.

Based on this, in an embodiment, the first functional entity selects at least one link for transmitting data, each link at least characterizing a connection between the first functional entity and one second functional entity;

the data packets are transmitted using at least one link.

Specifically, in actual application, the first functional entity may select at least one link for transmitting data according to needs, for example, the first functional entity may select at least one link for transmitting data according to transmission conditions of air interface data of at least two second functional entities; for another example, the first functional entity may further select at least one link for transmitting data according to the data amount applied by the at least two second functional entities.

The transmission condition of the air interface data may include: the rate of data transmission on the link, the ratio of the first functional entity PDU being sent in segments, the ratio of the first functional entity PDU being sent in cascade (i.e. multiple Service Data Units (SDUs) are placed in the same SN data block for transmission), the block error rate (BLER) of data transmission, the data buffer vacancy rate of the second functional entity, the ratio of data discard in the buffer of the second functional entity, etc.

In practical application, the first functional entity of L3 can be referred to as a UP functional entity of L3; the second functional entity of L2 may be a MAC functional entity. When the second functional entity of L2 is a MAC functional entity, the corresponding link may be referred to as a MAC link.

In an embodiment, the first part represents a starting value of an SN of a data packet sent by the first functional entity to a second functional entity corresponding to a link; the second portion characterizes an offset value of the data packet with respect to a starting value of the SN on the corresponding second functional entity.

In practical applications, the first portion may be referred to as an SN start value, and the second portion may be referred to as an SN offset value.

In practical application, the SN carried by the data packet includes an SN start value and an SN offset value, and in the data packet, the form of the SN may be set according to requirements, for example, the SN start value is used as a high-order field, and the corresponding SN offset value is used as a low-order field, so as to form a form of [ SN start value, SN offset value ].

Illustratively, the first functional entity of the sending-end device L3 may allocate several consecutive SDUs for a selected one of the links connected to the second functional entity; for the first SDU, the SN offset value included in the corresponding SN may be 0; for several SDUs subsequent to the first SDU, the SN offset values included may be 1, 2, 3, 4 … … in sequence. Here, the maximum number of consecutive SDUs allocated to each link by the first functional entity of the sending end device L3 may be related to a bit length of an SN offset value defined in a PDU (from the perspective of the second functional entity) sent by the first functional entity, for example, when the bit length of the SN offset value defined in the PDU is 8bits (bit), the maximum number of consecutive PDUs allocated to a link connected to the second functional entity by the first functional entity of the sending end device L3 may be 256, that is, 256 consecutive PDUs may be sent at a time, and when the number of PDUs sent at a time by the first functional entity of the sending end device L3 using a corresponding link exceeds 256, a new SN start value needs to be restarted, that is, a new SN start value is allocated to the PDU.

In practical application, after the receiving end device receives the data packets sent by the sending end device, the first functional entity of the receiving end device L3 may perform first-stage sorting on the data packets based on the SN start value included in each SN of the data packets, and then perform second-stage sorting on at least one data packet with the same SN start value after the first-stage sorting, based on an SN offset value included in the SN of the at least one data packet; in this way, a two-stage ordering mechanism is realized based on the first part and the second part included in the data packet SN, respectively, so that the in-order delivery of the data packets is realized.

In practical application, when the first functional entity of the sending-end device L3 selects a link connected to the second functional entity to send data packets, the sent data packets are all continuous, that is, SN initial values contained in SNs carried by each data packet are the same and SN offset values are different; when the first functional entity of the sending-end device L3 selects at least two links connected to the second functional entity to send a data packet, multiple data packets with the same SN initial value and different SN offset values are sent for each link connected to the second functional entity, that is, a group of consecutive data packets (which may also be referred to as a Cluster (english may be expressed as Cluster) with the same SN initial value is sent for each link connected to the second functional entity, and the SN initial values corresponding to each group of data packets are different. Here, in order for the first functional entity of the receiving-end device L3 to determine the timing for starting transmission of a corresponding set of packets so as to be able to sequence the received packets, the first functional entity of the transmitting-end device L3 may transmit indication information for indicating that transmission of a packet of one link is started before transmission of a packet of one link.

Based on this, in an embodiment, the first functional entity of the sending end device selects at least two links for sending data; the method may further comprise:

In an embodiment, the sending, by the first functional entity, the first information may include:

and the first functional entity sends PDU, and the PDU carries the first information.

Wherein, the first information may be carried by a control PDU.

In actual application, after receiving a PDU, a first functional entity of the receiving end device L3 may determine whether a corresponding group of data packets starts to be transmitted by judging whether the PDU carries first information, and construct an SN start value and an SN offset value for subsequently received data packets to obtain a corresponding data packet SN under the condition that it is determined that the PDU carries the first information.

In practical applications, the first functional entity of the receiving end device L3 may determine that the last group of transmitted data packets ends transmission when receiving the first information. Of course, the first functional entity of the sending-end device L3 may also send indication information for indicating the end of sending the data packet of a corresponding link after the end of sending the data packet of a link connected to the second functional entity, so that the first functional entity of the receiving-end device L3 can determine the timing of ending transmission of a corresponding group of data packets.

Based on this, in an embodiment, the method may further include:

In an embodiment, the sending, by the first functional entity, the second information may include:

In practical application, the control PDU may be used to carry the second information.

In practical application, in the process of data packet transmission, there may also be a link switching process under the influence of various factors, and when a link needs to be switched, the first functional entity needs to select a target link.

Based on this, in one embodiment, the first functional entity selects a target link for transmitting data; the target link characterizes at least a connection between the first functional entity and a second functional entity;

transmitting the data packet of the source link on the destination link; the source link characterizes at least a connection between the first functional entity and one second functional entity.

Here, in actual application, the first functional entity selects the target link as needed.

Specifically, the first functional entity may determine, according to a transmission parameter of air interface data of a second functional entity corresponding to the source link, that a target link for transmitting data needs to be selected.

When a target link sends a data packet, the data packet also carries the sequence relation of the data packet; likewise, the sequential relationship of the data packets is determined by the first functional entity. That is, the sequential relationship of all packets is determined by the first functional entity.

Correspondingly, an embodiment of the present application further provides a data transmission method, which is applied to a receiving end device, and includes:

In an embodiment, when a sending end device uses at least one link to send data, the receiving end device receives the data by using the at least one link; each link characterizes at least a connection between a first functional entity of the sink device L3 and one second functional entity of the sink device L2.

In an embodiment, when a sending end device uses at least two links to send data, the receiving end device receives the data by using the at least two links; at this time, the method may further include:

Here, in an embodiment, the receiving, by the first functional entity of the receiving end device, the first information includes:

In an embodiment, the method may further comprise:

Here, in an embodiment, the receiving, by the first functional entity of the receiving end device, the second information includes:

An embodiment of the present application further provides a data transmission method, as shown in fig. 2, the method includes:

step 201: sending end equipment sends a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

Step 202: the receiving end device receives the data packet.

In the data transmission method provided by the embodiment of the application, the sending end equipment sends a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by the first functional entity at the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part represents the transmission sequence of the data packets on a second functional entity corresponding to a link; the receiving end equipment receives the data packet sent by the sending end equipment, so that the data packet transmitted on the end-to-end L3UP link is decomposed into an L3 functional entity part and a functional entity part connected with an L3 functional entity and connected with an L2, and the L3 functional entity can be defined according to the service type, thereby realizing the receiving and sending of the short SN data packet, reducing the expense of the data packet and realizing the flexible definition of the SN.

The present application will be described in further detail with reference to the following application examples.

In the embodiment of the application, the sending end device is simply called a sending end, and the receiving end device is simply called a receiving end; the first functional entity of L3 is referred to as L3 UP; the second functional entity of L2 is a MAC functional entity; the link where the L3UP is connected with one MAC functional entity is called a MAC link; the sequence relationship (i.e., SN) of the packet is referred to as L3UP _ SN; the first part contained by L3UP _ SN is referred to as L3UP _ SN _ Start; the second part contained by L3UP _ SN is referred to as L3UP _ SN _ Offset; l3UP _ SN is in the form of [ L3UP _ SN _ Start, L3UP _ SN _ Offset ] in the packet, i.e., L3UP _ SN _ Start is a high-order field and L3UP _ SN _ Offset is a low-order field.

In the embodiment of the application, a two-stage SN mechanism of L3UP and MAC is adopted, the MAC link is selected through L3UP, and SN of L3UP is shifted according to the MAC link, so that short SN inside the MAC link is realized (namely, compared with the related technology, the length of SN is reduced); meanwhile, the L3UP of the sending end controls the sequencing of different MAC links and sends the L3UP _ SN _ Start corresponding to each MAC link to the L3UP of the receiving end, thereby implementing an SN selection mechanism of the end-to-end L3 UP.

The SN selection mechanism of the end-to-end L3UP is described in detail below.

First, an SN selection mechanism of the sender L3UP is described.

The L3UP of the sending end maintains L3UP _ SN, and needs to distribute data packets to each MAC link according to a continuous data packet distribution mode; wherein, the L3UP of the transmitting end maintains the L3UP _ SN in the following manner: l3UP _ SN increases by 1 for each packet sent. The L3UP of the transmitting end may allocate several consecutive L3UP SDUs for a selected one MAC link; wherein for the first L3UP SDU, L3UP _ SN _ Offset is 0; for several L3UP SDUs subsequent to the first L3UP SDU, L3UP _ SN _ Offset is 1, 2, 3, 4 … … in order. Here, the maximum number of consecutive L3UP SDUs allocated by the L3UP at the transmitting end for each MAC link is related to the L3UP _ SN _ Offset (partial SN in PDU) bit length defined (i.e., specified) in the PDU transmitted by the L3UP (from the perspective of the MAC functional entity); for example, when the bit length of L3UP _ SN _ Offset defined in L3UP PDU is 8bits, the maximum number of consecutive L3UP PDUs allocated by L3UP of the transmitting end for one MAC link may be 256, that is, 256 consecutive L3UP PDUs may be transmitted at one time, and when the number of L3UP PDUs transmitted at one time by L3UP of the transmitting end using a corresponding MAC link exceeds 256, the L3UP of the transmitting end needs to restart a new L3UP _ SN _ Start, that is, allocate a new L3UP _ SN _ Start to the L3UP PDU.

In practical application, L3UP at the transmitting end needs to select a MAC link for transmitting data, and when only one MAC link is selected at L3UP at the transmitting end, the transmitted data packets are all continuous, that is, L3UP _ SN _ Start included in L3UP _ SN carried by each data packet is the same and L3UP _ SN _ Offset is different. In the case that the L3UP of the transmitting end connects at least two MAC links at the same time, for each connected MAC link, the L3UP of the transmitting end sends multiple packets with the same L3UP _ SN _ Start and different L3UP _ SN _ offsets, that is, the L3UP of the transmitting end sends a group of consecutive packets (that is, one packet cluster) with the same L3UP _ SN _ Start for each connected MAC link, and the L3UP _ SN _ Start corresponding to each group of packets is different.

During the data transmission process on the selected MAC link by L3UP at the transmitting end, the MAC link may also be switched to transmit data on the target link.

In practical application, as shown in fig. 3, in order to enable L3UP of the receiving end to determine the timing for starting transmission of a corresponding group of L3UP SDUs, L3UP of the transmitting end may add a transmission L3UP _ SN _ Start control packet at the beginning of each group of L3UP SDUs; of course, in order to enable the L3UP at the receiving end to determine the timing for the corresponding group of L3UP SDUs to end transmission, the L3UP at the transmitting end may also add an L3UP _ SN _ Start end control packet when each group of L3UP SDUs is finished transmitting.

Next, the sorting mechanism of the receiving end L3UP is described.

After receiving the data packet, the receiving L3UP determines whether the packet is an L3UP _ SN _ Start control packet, and if so, the SN of the L3UP PDU received subsequently is the result of assembling L3UP _ SN _ Start and L3UP _ SN _ Offset. When determining whether transmission of one packet cluster is completed, the L3UP of the receiving end may determine from the L3UP _ SN _ Start end control packet, and when the L3UP _ SN _ Start end control packet is not received, the L3UP of the receiving end may determine from the L3UP _ SN _ Start control packet indicating transmission Start of the next packet cluster. For the received data packets, the L3UP at the receiving end performs the first-level sorting according to L3UP _ SN _ Start, and then performs the second-level sorting according to L3UP _ SN _ Offset, thereby implementing the in-order delivery of the data packets.

In the embodiment of the present application, both the network side and the terminal side have the same roles as the receiving end and the sending end, that is, the sending end may be the network side, and the receiving end is the terminal side; the sending end may also be a terminal side, and the receiving end is a network side.

The L3UP _ SN _ Start control packet and the L3UP _ SN _ Start end control packet may be collectively referred to as an SN control packet (i.e., control PDU) of L3UP, and the basic contents of the control PDU include: l3UP _ SN _ Start may also contain the bit length of L3UP _ SN _ Offset. In practical applications, the control PDU may adopt the PDU format shown in fig. 4.

Wherein the D/C identifies whether the PDU is a control PDU or a data PDU. The D/C field is at least 1 bit long. Specifically, as shown in table 1, when the value of the D/C field is 0, the PDU is identified as a control PDU; when the value of the D/C field is 1, the PDU is identified as a data PDU.

Bit	Description
		0	Control PDU
1	Data PDU

TABLE 1

The PDU Type identifies the Type of the PDU, and as shown in table 2, the length of the PDU Type may be multiple bits, leaving an option for later addition of a new PDU Type.

Bit	Description
		000	SN Selection
001-111	Reserved

TABLE 2

SN Length identifies the Length selection of L3UP _ SN _ Offset in the corresponding packet cluster; illustratively, the Length of the SN Length field may be identified directly by using the field Length of the SN Length to identify the Length of L3UP _ SN _ Offset, that is, the Length of the SN Length field is selected according to the Length of the SN to be identified, for example, the maximum Length of L3UP _ SN _ Offset is 16 bits, and the Length of the SN Length field cannot be less than 4 bits; illustratively, an index of the Length of L3UP _ SN _ Offset may also be identified using the SN Length field. As shown in fig. 4, when the SN Length field has a Length of 3 bits, the SN Length field may indicate 8 choices of L3UP _ SN _ Offset lengths, such as several L3UP _ SN _ Offset lengths shown in table 3.

Bit	Description
		000	SN＝8bits(L3UP_SN_Offset)
001	SN＝16bits(L3UP_SN_Offset)
		010	SN＝12bits(L3UP_SN_Offset)
011	SN＝4bits(L3UP_SN_Offset)
		……	other bit length
100-111	Reserved

TABLE 3

In practical applications, the L3UP may select an appropriate L3UP _ SN _ Offset Length according to the actual amount of data carried by the upper layer, and define the SN Length field.

In practical application, during data transmission, each data packet corresponds to a Hybrid Automatic Repeat reQuest (HARQ) process, and the MAC function entity may select a suitable HARQ mode for the data packet, such as an air interface feedback mode, so as to control a time delay of each data packet from the MAC function entity to an air interface. Illustratively, when the MAC functional entity needs to successfully transmit a data packet within 2 ms, an appropriate HARQ mode can be selected to complete the data correct transmission (which may include data initial transmission and data retransmission) within 2 ms.

In practical application, when the MAC link needs to be switched during user switching or air interface load balancing during data transmission, L3UP also needs to select an available target MAC link. For example, L3UP selects according to the rate at which the MAC functional entity sends data over the air interface on the MAC link, and when the rate at which the MAC link sends data over the air interface is low, it indicates that the air interface of the MAC link is heavily loaded, or the block error rate (BLER) of the air interface is poor, or the quality of the air interface link is poor, and the MAC link needs to be changed to send a data packet.

In this case, L3UP determines the starting value of the new MAC link (i.e. the target MAC link) and the offset value of each packet, and starts to transmit data on the air interface corresponding to the new MAC link (target).

Here, for the receiving end, the O3 UP of the receiving end still performs the first-level sorting according to L3UP _ SN _ Start, and then performs the second-level sorting according to L3UP _ SN _ Offset, thereby implementing the in-order delivery of the data packets.

The scheme provided by the application embodiment has the following advantages:

(1) in the switching process of the link, data can be sent uninterruptedly on the source MAC link and the target MAC link through L3UP, and the link switching of data seamless transmission is realized;

(2) when the link switching causes that the data needs to be retransmitted, the L3UP can send the data needing to be retransmitted, and zero loss of the data is realized, that is, the link switching of lossless transmission of the data is realized;

(3) by combining L3UP sequencing and MAC layer (namely MAC function entity) sequencing, the data packet transmitted on the end-to-end L3UP link is decomposed into L3UP and MAC function entities, thereby realizing rapid sequencing of the data packet, realizing receiving and transmitting of the short SN data packet, reducing the overhead of the data packet and realizing flexible definition of the SN;

(4) and the transmission of the deterministic data is realized through MAC HARQ.

In order to implement the method at the sending end device side in the embodiment of the present application, an embodiment of the present application further provides a data transmission device, which is disposed on the sending end device, and as shown in fig. 5, the device includes: a first functional entity unit 501 and a second functional entity unit 502; wherein the content of the first and second substances,

the first functional entity unit 501 and the second functional entity unit 502 are configured to send a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequential relationship of the data packets is determined by the first functional entity unit 501 of the sending end device L3; the first functional entity unit 501 is connected to at least one second functional entity unit 502 of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least represents the connection of the first functional entity unit 501 with a second functional entity unit 502; the second part characterizes the transmission order of the data packets on the second functional entity unit 502 corresponding to one link.

In an embodiment, the first portion represents a starting value of a sequence number of a packet sent by the first functional entity unit 501 to the second functional entity unit 502 corresponding to one link; the second part characterizes an offset value of the data packet with respect to the starting value of the sequence number on the corresponding second functional entity unit 502.

In one embodiment, the determining includes at least one of:

production and/or resetting of a data packet sequence number;

selecting an initial value of a data packet sequence number;

an increase or decrease in the number of packet sequences;

use of packet sequence numbers in packet ordering.

In an embodiment, the first functional entity unit 501 selects at least one link for transmitting data, each link at least representing a connection between the first functional entity unit 501 and a second functional entity unit 502; the data packets are transmitted using at least one link.

In an embodiment, the first functional entity unit 501 selects at least two links for transmitting data;

before transmitting a data packet of a link, the first functional entity unit 501 is further configured to transmit first information; the first information indicates that a packet of one link starts to be transmitted.

In an embodiment, the first functional entity unit 501 is specifically configured to send a PDU, where the PDU carries the first information.

In an embodiment, after the data packet of one link is sent, the first functional entity unit 501 is further configured to send second information; the second information indicates that the data packet transmission of the corresponding link is finished.

In an embodiment, the first functional entity unit 501 is specifically configured to send a PDU, where the PDU carries the second information.

In an embodiment, the first functional entity unit 501 is further configured to select a target link for transmitting data; the target link at least characterizes a connection between the first functional entity unit 501 and a second functional entity unit 502;

transmitting the data packet of the source link on the destination link; the source link at least characterizes the connection between the first functional entity unit 501 and one second functional entity unit 502.

In practical applications, the first functional entity unit 501 and the second functional entity unit 502 may be implemented by a processor in a data transmission device in combination with a communication interface.

In order to implement the method of the receiving end device side in the embodiment of the present application, an embodiment of the present application further provides a data transmission device, which is disposed on the receiving end device, and as shown in fig. 6, the data transmission device includes: a first functional entity unit 601 and a second functional entity unit 602; wherein the content of the first and second substances,

the first functional entity unit 601 and the second functional entity unit 602 are configured to receive a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequential relationship of the data packets is determined by a first functional entity of the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

In an embodiment, the first part represents a starting value of a sequence number of a data packet sent by the first functional entity to a second functional entity corresponding to a link; the second portion characterizes an offset value of the data packet with respect to a starting value of the sequence number on the corresponding second functional entity.

In one embodiment, data is received with at least one link; each link represents at least a connection between the first functional entity unit 601 of the sink device L3 and one second functional entity unit 602 of the sink device L2.

In one embodiment, data is received with at least two links; the first functional entity unit 601 is configured to receive first information; the first information indicates that a packet of one link starts to be transmitted.

In an embodiment, the first functional entity unit 601 is specifically configured to receive a PDU, where the PDU carries the first information.

In an embodiment, the first functional entity unit 601 is configured to receive second information; the second information indicates that the data packet transmission of the corresponding link is finished.

In an embodiment, the first functional entity unit 601 is specifically configured to receive a PDU, where the PDU carries the second information.

In practical applications, the first functional entity unit 601 and the second functional entity unit 602 may be implemented by a processor in a data transmission device in combination with a communication interface.

It should be noted that: in the data transmission device provided in the above embodiment, only the division of the program modules is exemplified when data transmission is performed, and in practical applications, the processing distribution may be completed by different program modules according to needs, that is, the internal structure of the device may be divided into different program modules to complete all or part of the processing described above. In addition, the data transmission device and the data transmission method provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments and are not described herein again.

Based on the hardware implementation of the program module, and in order to implement the method of the sending end device side in the embodiment of the present application, an embodiment of the present application further provides a sending end device, and as shown in fig. 7, the sending end device 700 includes:

a first communication interface 701 capable of performing information interaction with a receiving end device;

the first processor 702 is connected to the first communication interface 701, so as to implement information interaction with a receiving end device, and is configured to execute the method provided by one or more technical solutions of the sending end device side when running a computer program. And the computer program is stored on the first memory 703.

Specifically, the first communication interface 701 is configured to send a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at the sending end device 700L 3; the first functional entity is connected with at least one second functional entity of the sender device 700L 2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

In one embodiment, the determining includes at least one of:

production and/or resetting of a data packet sequence number;

selecting an initial value of a data packet sequence number;

an increase or decrease in the number of data packet sequences;

use of packet sequence numbers in packet ordering.

In an embodiment, the first functional entity selects, via the first processor 702, at least one link for transmitting data, each link at least characterizing a connection between the first functional entity and a second functional entity; the data packets are transmitted using at least one link.

In an embodiment, the first functional entity selects, by the first processor 702, at least two links for transmitting data;

before transmitting a data packet of a link, the first functional entity transmits first information through the first communication interface 701; the first information indicates that a packet of one link starts to be transmitted.

In an embodiment, the first functional entity specifically sends a PDU through the first communication interface 701, where the PDU carries the first information.

In an embodiment, after the data packet of one link is sent, the first functional entity sends second information through the first communication interface 701; the second information indicates that the data packet transmission of the corresponding link is finished.

In an embodiment, the first functional entity specifically sends a PDU through the first communication interface 701, where the PDU carries the second information.

In one embodiment, the first functional entity selects a target link for transmitting data through the first processor 702; the target link characterizes at least a connection between the first functional entity and a second functional entity;

It should be noted that: the specific processes of the first processor 702 and the first communication interface 701 may be understood with reference to the above-described methods.

Of course, in practice, the various components in the initiator device 700 are coupled together by a bus system 704. It is understood that the bus system 704 is used to enable communications among the components. The bus system 704 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled in fig. 7 as the bus system 704.

The first memory 703 in the embodiment of the present application is used to store various types of data to support the operation of the transmitting end device 700. Examples of such data include: any computer program for operation on the sending-end device 700.

The method disclosed in the embodiments of the present application can be applied to the first processor 702, or implemented by the first processor 702. The first processor 702 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the first processor 702. The first Processor 702 may be a general purpose Processor, a Digital Signal Processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc. The first processor 702 may implement or perform the methods, steps and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium located in the first memory 703, and the first processor 702 reads the information in the first memory 703 and completes the steps of the foregoing method in combination with its hardware.

In an exemplary embodiment, the sender Device 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), Complex Programmable Logic Devices (CPLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, Micro Controllers (MCUs), microprocessors (microprocessors), or other electronic components for performing the aforementioned methods.

Based on the hardware implementation of the program module, and in order to implement the method on the receiving end device side in the embodiment of the present application, an embodiment of the present application further provides a receiving end device, and as shown in fig. 8, the receiving end device 800 includes:

the second communication interface 801 can perform information interaction with the sending-end equipment;

the second processor 802 is connected to the second communication interface 801 to implement information interaction with the sending end device, and is configured to execute the method provided by one or more technical solutions of the receiving end device side when running a computer program. And the computer program is stored on the second memory 803.

Specifically, the second communication interface 801 is configured to receive a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by the first functional entity of the sending end device L3; the first functional entity is connected with at least one second functional entity of the sender device L2; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

In one embodiment, data is received with at least one link; each link represents at least a connection between a first functional entity of the sink device 800L3 and a second functional entity of the sink device 800L 2.

In one embodiment, data is received with at least two links; the first functional entity of the receiving end device 800 receives the first information through the second communication interface 801; the first information indicates that a packet of one link starts to be transmitted.

In an embodiment, the first functional entity of the receiving end device 800 specifically receives a PDU through the second communication interface 801, where the PDU carries the first information.

In an embodiment, the first functional entity of the receiving end device 800 receives the second information through the second communication interface 801; the second information indicates that the data packet transmission of the corresponding link is finished.

In an embodiment, the first functional entity of the receiving end device 800 specifically receives the PDU through the second communication interface 801, where the PDU carries the second information.

It should be noted that: the specific processing procedures of the second communication interface 801 and the second processor 802 can be understood with reference to the above-described methods.

Of course, in practice, the various components in the sink apparatus 800 are coupled together by the bus system 804. It is understood that the bus system 804 is used to enable communications among the components. The bus system 804 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 804 in FIG. 8.

The second memory 803 in the embodiment of the present application is used for storing various types of data to support the operation of the receiving end device 800. Examples of such data include: any computer program for operating on the sink device 800.

The method disclosed in the embodiment of the present application can be applied to the second processor 802, or implemented by the second processor 802. The second processor 802 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by an integrated logic circuit of hardware or an instruction in the form of software in the second processor 802. The second processor 802 described above may be a general purpose processor, a DSP, or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The second processor 802 may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium located in the second memory 803, and the second processor 802 reads the information in the second memory 803, and completes the steps of the foregoing method in conjunction with its hardware.

In an exemplary embodiment, the receiving end device 800 may be implemented by one or more ASICs, DSPs, PLDs, CPLDs, FPGAs, general-purpose processors, controllers, MCUs, microprocessors, or other electronic components for performing the aforementioned methods.

It is understood that the memories (the first memory 703 and the second memory 803) of the embodiments of the present application may be volatile memories or nonvolatile memories, and may include both volatile and nonvolatile memories. Among them, the nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic random access Memory (FRAM), a magnetic random access Memory (Flash Memory), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced DRAM), Synchronous Dynamic Random Access Memory (SLDRAM), Direct Memory (DRmb Access), and Random Access Memory (DRAM). The memories described in the embodiments of the present application are intended to comprise, without being limited to, these and any other suitable types of memory.

In order to implement the method provided by the embodiment of the present application, an embodiment of the present application further provides a data transmission system, as shown in fig. 9, where the system includes: a transmitting end device 901 and a receiving end device 902.

Here, it should be noted that: the specific processing procedures of the sending end device 901 and the receiving end device 902 have been described in detail above, and are not described herein again.

In an exemplary embodiment, the present application further provides a storage medium, specifically a computer storage medium, which is a computer readable storage medium, for example, the storage medium includes a first memory 703 storing a computer program, and the computer program is executable by a first processor 702 of a transmitting-end device 700 to complete the steps of the side-by-side method of the transmitting-end device. For another example, the second memory 803 may be used to store a computer program, which may be executed by the second processor 802 of the receiving device 800 to perform the steps of the receiving device side method. The computer readable storage medium may be Memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface Memory, optical disk, or CD-ROM.

It should be noted that: "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The technical means described in the embodiments of the present application may be arbitrarily combined without conflict.

The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.

Claims

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

sending a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at the third equipment layer of the sending end; the first functional entity is connected with at least one second functional entity of the second sending end device layer; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

2. The method according to claim 1, wherein the first portion characterizes a starting value of a sequence number of a packet sent by the first functional entity to a second functional entity corresponding to a link; the second portion characterizes an offset value of the data packet with respect to a starting value of the sequence number on the corresponding second functional entity.

3. The method of claim 1, wherein the determining comprises at least one of:

production and/or resetting of a data packet sequence number;

selecting an initial value of a data packet sequence number;

an increase or decrease in the number of data packet sequences;

use of packet sequence numbers in packet ordering.

4. A method according to any of claims 1 to 3, characterized in that the first functional entity selects at least one link for transmitting data, each link characterizing at least a connection between the first functional entity and one second functional entity;

the data packets are transmitted using at least one link.

5. The method according to claim 4, characterized in that said first functional entity selects at least two links for transmitting data; the method further comprises the following steps:

6. The method of claim 5, wherein the first functional entity sends the first information, comprising:

7. The method of claim 5, further comprising:

8. The method of claim 7, wherein the first functional entity sends the second information, comprising:

9. A data transmission method is applied to a receiving end device, and comprises the following steps:

receiving a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at a third equipment layer of a sending end; the first functional entity is connected with at least one second functional entity of the second sending end device layer; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

10. The method according to claim 9, wherein the first portion characterizes a starting value of a sequence number of a packet sent by the first functional entity to a second functional entity corresponding to a link; the second portion characterizes an offset value of the data packet with respect to a starting value of the sequence number on the corresponding second functional entity.

11. A method according to claim 9 or 10, characterized by receiving data with at least one link; each link at least represents the connection between the first functional entity of the third receiving end device layer and one second functional entity of the second receiving end device layer.

12. The method of claim 11, wherein at least two links are used to receive data; the method further comprises the following steps:

13. The method according to claim 12, wherein the receiving end device first functional entity receives the first information, and comprises:

14. The method of claim 12, further comprising:

15. The method according to claim 14, wherein the receiving end device first functional entity receives the second information, which comprises:

16. A data transmission apparatus, provided on a sending-end device, comprising: a first functional entity unit and a second functional entity unit; wherein the content of the first and second substances,

the first functional entity unit and the second functional entity unit are used for sending data packets; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity unit at the third equipment layer of the sending end; the first functional entity unit is connected with at least one second functional entity unit of the second sending end device layer; the first portion characterizes an order of data packets on at least one link; each link at least represents the connection of the first functional entity unit and a second functional entity unit; the second part represents the transmission sequence of the data packets on a second functional entity unit corresponding to a link.

17. A data transmission apparatus, provided on a receiving-end device, comprising: a first functional entity unit and a second functional entity unit; wherein the content of the first and second substances,

the first functional entity unit and the second functional entity unit are used for receiving data packets; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at a third equipment layer of a sending end; the first functional entity is connected with at least one second functional entity of the second sending end device layer; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

18. A transmitting-end device, comprising: a first communication interface and a first processor; wherein the content of the first and second substances,

the first communication interface is used for sending data packets; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at the third equipment layer of the sending end; the first functional entity is connected with at least one second functional entity of the second sending end device layer; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

19. A receiving-end device, comprising: a second communication interface and a second processor; wherein, the first and the second end of the pipe are connected with each other,

the second communication interface is used for receiving a data packet; the data packets carry the sequence relation of the data packets; the sequence relation of the data packet comprises a first part and a second part; the sequence relation of the data packets is determined by a first functional entity at a third equipment layer of a sending end; the first functional entity is connected with at least one second functional entity of the second sending end device layer; the first portion characterizes an order of data packets on at least one link; each link at least characterizes a connection of the first functional entity to a second functional entity; the second part characterizes the transmission sequence of the data packets on a second functional entity corresponding to a link.

20. A transmitting-end device, comprising: a first processor and a first memory for storing a computer program capable of running on the processor,

wherein the first processor is adapted to perform the steps of the method of any one of claims 1 to 8 when running the computer program.

21. A receiving-end device, comprising: a second processor and a second memory for storing a computer program capable of running on the processor,

wherein the second processor is adapted to perform the steps of the method of any of claims 9 to 15 when running the computer program.

22. A storage medium having stored thereon a computer program for performing the steps of the method of any one of claims 1 to 8 or for performing the steps of the method of any one of claims 9 to 15 when executed by a processor.