CN112583530A

CN112583530A - Data transmission method, device and equipment

Info

Publication number: CN112583530A
Application number: CN201910924646.1A
Authority: CN
Inventors: 谌丽
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2021-03-30
Anticipated expiration: 2039-09-27
Also published as: CN112583530B

Abstract

The invention discloses a data transmission method, a device and equipment, wherein the method comprises the following steps: the first node performs RLC retransmission on a radio link layer control protocol data unit, RLC PDU, the RLC retransmission comprising: copying the RLC PDUs to obtain at least two RLC PDUs and submitting the RLC PDUs to a lower layer; and mapping the at least two RLC PDUs to different media access control layer protocol data units (MAC PDUs) and then sending the RLC PDUs to a second node. The embodiment of the invention can realize the reliability control of each hop transmission, thereby avoiding the resource waste caused by adopting the end-to-end PDCP repeated transmission while realizing the reliability of data transmission.

Description

Data transmission method, device and equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method, apparatus, and device.

Background

The 5G NR (New Radio, New air interface) system mainly supports the following three types of services:

1) eMBB (enhanced Mobile Broadband, enhanced Broadband communications);

2) mtc (massive Machine Type Communications);

3) URLLC (Ultra-Reliable and Low Latency Communications)

For URLLC, because of its high requirements on delay and reliability, a solution proposed by 3GPP is to introduce a PDCP (Packet Data Convergence Protocol) repeat transmission mechanism, that is, transmit the same PDCP layer PDU (Protocol Data Unit) through multiple paths, improve transmission reliability through multiple transmission gains, and reduce transmission delay.

As shown in fig. 1 and fig. 2, a Radio bearer corresponds to a PDCP entity, and data on the Radio bearer is transmitted through a plurality of RLC entities and a Logical Channel (Logical Channel) corresponding to each RLC entity in an RLC (Radio Link Control) layer. For the CA model, a plurality of logical channels corresponding to the repeatedly transmitted radio bearers are processed by one MAC entity in the MAC layer, and data from different RLC entities are mapped to different carriers for transmission. For the DC model, multiple RLC entities corresponding to duplicate RBs and their corresponding logical channels are mapped to different MAC entities, respectively.

A multi-hop relay network architecture IAB (Integrated Access and Backhaul) is introduced into the 5G system, and fig. 3 is a schematic diagram of a relay network architecture (IAB architecture) for data transmission through a relay node. The RAN2, which is peered to the terminal (UE), controls the plane RRC layer and the PDCP layer of the user plane on an IAB donor (IAB donor), between which there are a number of wireless network nodes IAB, one IAB node containing an MT (Mobile-Termination) part and a DU (Data Unit) part. The MT part is responsible for establishing a connection between the IAB node and a higher-level network node (also called a parent node), and the DU part is responsible for communicating with a lower-level node or a terminal. Here, the upper node and the lower node are in an upper-lower relationship in terms of a data transmission direction, that is, the node receives data from the upper node and transmits data to the lower node.

In the IAB architecture, the IAB node air interface user plane layer 2 only has a BAP (Backhaul adaptation Protocol) layer, an RLC layer, and an MAC layer. The architecture shown in fig. 3 is only a schematic diagram, and the specific modeling manner of the BAP layer is not determined at present.

In the IAB architecture, if PDCP retransmission is adopted, each PDCP PDU needs to be retransmitted between each hop node, which results in a large resource consumption.

Disclosure of Invention

At least one embodiment of the present invention provides a data transmission method, apparatus, and device, which can implement reliability control of per-hop transmission by introducing RLC retransmission, thereby avoiding resource waste caused by using end-to-end PDCP retransmission while implementing reliability of data transmission.

The embodiment of the invention provides a data transmission method, which is applied to a first node in a relay network architecture for transmitting data through a relay node, and comprises the following steps:

the first node performs RLC retransmission on a radio link layer control protocol data unit, RLC PDU, the RLC retransmission comprising: copying the RLC PDUs to obtain at least two RLC PDUs and submitting the RLC PDUs to a lower layer;

mapping the at least two RLC PDUs to different media access control layer protocol data units (MAC PDUs) and then sending the RLC PDUs to a second node;

the first node and the second node are adjacent nodes in the relay network architecture, and the first node is an IAB donor an IAB intermediate node or a terminal in the relay network architecture.

Optionally, in the foregoing method, mapping the at least two RLC PDUs to different MAC PDUs and then sending the MAC PDUs to the second node includes:

mapping the at least two RLC PDUs to different MAC PDUs to obtain at least two MAC PDUs;

and mapping different MAC PDUs onto different carriers or carrier groups according to preset carriers or carrier groups capable of repeatedly transmitting the RLC PDUs, and sending the different MAC PDUs to the second node.

Optionally, in the above method, before copying the required number of copies of the RLC PDU for which the RLC retransmission is performed, the method further includes:

receiving configuration information repeatedly transmitted by RLC sent by a third node, wherein the third node is a master control node of a relay network architecture, or an IAB donor, or a previous-stage node of a first node, and the configuration information includes at least one of the following information:

the number or logical channel number LCID of the RLC entity which carries out RLC repeated transmission between adjacent nodes;

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

different carriers or carrier groups used for transmitting the same RLC PDU; and the number of the first and second groups,

the RLC repeats an initial state of transmission, which is active or inactive.

Optionally, in the foregoing method, after receiving feedback information of successful reception of a first RLC PDU of the at least two RLC PDUs by the second node, the method further includes:

discarding and canceling transmission of other RLC PDUs except the first RLC PDU in the at least two repeated RLC PDUs.

Optionally, the method further includes:

receiving an activating/deactivating command repeatedly transmitted by RLC sent by a fourth node, wherein the fourth node is an IAB donor, the second node, or, a previous-stage node of the first node;

and activating/deactivating the RLC repeated transmission of the corresponding bearer according to the activating/deactivating command of the RLC repeated transmission.

Optionally, in the foregoing method, the activation/deactivation command is one or more of a backhaul adaptation protocol BAP control command, an RLC control PDU, or a media access control layer control element MAC CE.

Optionally, in the foregoing method, the activation/deactivation command includes at least one of the following:

the RLC entity identification or the logical channel identification of the RLC repeated transmission;

the RLC repeatedly transmits a corresponding carrier or carrier group indication;

the target terminal identification of the activated/deactivated RLC repeated transmission; and the number of the first and second groups,

the activated/deactivated RLC repeats the transmitted target bearer identification.

Optionally, in the foregoing method, the activating/deactivating command includes: a header field for indicating that the present command is a command for activating/deactivating RLC retransmission; wherein the content of the first and second substances,

when the activation/deactivation command is used for RLC repeated transmission of at least one RLC entity, the activation/deactivation command further includes:

at least one RLC entity indication field for indicating activation/deactivation of RLC repeated transmission of a corresponding RLC entity;

the carrier indicating domain corresponding to each RLC indicating domain is used for indicating the carrier used by the corresponding RLC entity for repeatedly transmitting the RLC PDU;

when the activation/deactivation command is used for activating/deactivating RLC repeated transmission of the target terminal and/or the target bearer, the activation/deactivation command further includes:

a terminal indication field for indicating a target terminal for activating/deactivating RLC repeated transmission;

a bearer indication field for indicating activation/deactivation of a target bearer for RLC repeated transmission;

an RLC indication field for indicating the RLC entity which activates/deactivates RLC repeated transmission;

and the carrier indication field is used for indicating a carrier or a carrier group used by the copied data of the corresponding RLC entity or RLC PDU.

The embodiment of the present invention further provides a data transmission method, which is applied to a second node in a relay network architecture for performing data transmission through a relay node, and includes:

the second node receives at least one RLC PDU sent by the first node;

when the same RLC PDU exists in the at least one RLC PDU, performing repeated elimination processing on the RLC PDU on an RLC layer;

the second node and the first node are adjacent nodes in the relay network architecture, and the second node is an IAB donor, an IAB intermediate node or a terminal in the relay network architecture.

Optionally, the method further includes:

after receiving the at least one RLC PDU, sending successful reception feedback information for the at least one RLC PDU to the first node.

Optionally, the method further includes:

receiving configuration information sent by a third node, where the third node may be a master control node in a relay network architecture, or an IAB donor, or a first node, or a higher-level node of a second node, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

Optionally, the method further includes:

receiving an activating/deactivating command repeatedly transmitted by RLC sent by a fourth node, wherein the fourth node is an IAB donor, the first node, or a previous-stage node of the first node;

The embodiment of the present invention further provides a data transmission method, which is applied to a third node in a relay network architecture for performing data transmission through a relay node, and includes:

the third node sends configuration information of RLC repeated transmission to a first node, wherein the first node is a sending end node in the RLC repeated transmission, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

an initial state of RLC repeated transmission, wherein the initial state is activated or not activated;

the third node is a master control node of a relay network architecture, or an IAB donor, or a superior node of the first node, and the configuration information includes at least one of the following information.

Optionally, the method further includes:

and the third node sends the configuration information of the RLC repeated transmission to a second node, wherein the second node is a receiving end node in the RLC repeated transmission.

Optionally, in the above method, before sending the configuration information repeatedly transmitted by the RLC to the first node, the method further includes:

and selecting at least one hop needing RLC repeated transmission from the end-to-end multi-hop transmission link, and taking the sending end node in each selected hop as the first node.

The invention also provides a data transmission method, which is applied to a fourth node in a relay network architecture for transmitting data through the relay node, and comprises the following steps:

the fourth node sends an activating/deactivating command of RLC repeated transmission to the first node;

wherein the fourth node is an IAB denor, the first node, or a previous node of the first node; the first node is a sender node in the RLC repeated transmission.

Optionally, the method further includes:

and the fourth node sends an activating/deactivating command of RLC repeated transmission to a second node, wherein the second node is a receiving end node in the RLC repeated transmission.

The present invention also provides a data transmission device, applied to a first node in a relay network architecture for data transmission through a relay node, including:

an RLC retransmission module, configured to perform RLC retransmission on a radio link layer control protocol data unit, RLC PDU, where the RLC retransmission includes: copying the RLC PDUs to obtain at least two RLC PDUs and submitting the RLC PDUs to a lower layer;

the mapping processing module is used for mapping the at least two RLC PDUs to different media access control layer protocol data units (MAC PDUs) and then sending the different MAC PDUs to the second node;

The present invention also provides a first node, comprising: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor;

the processor implements the following steps when executing the program:

performing RLC repeat transmission on a radio link layer control protocol data unit (RLC PDU), wherein the RLC repeat transmission comprises: copying the RLC PDUs to obtain at least two RLC PDUs and submitting the RLC PDUs to a lower layer;

the first node and the second node are adjacent nodes in a relay network architecture for data transmission through a relay node, and the first node is an IAB donor, an IAB intermediate node or a terminal in the relay network architecture.

Optionally, in the first node, when the processor executes the program, the following steps are further implemented: mapping the at least two RLC PDUs to different MAC PDUs to obtain at least two MAC PDUs; and mapping different MAC PDUs onto different carriers or carrier groups according to preset carriers or carrier groups capable of repeatedly transmitting the RLC PDUs, and sending the different MAC PDUs to the second node.

Optionally, in the first node, when the processor executes the program, the following steps are further implemented: before copying the required number of parts of the RLC PDU for the RLC repeated transmission, receiving configuration information of the RLC repeated transmission sent by a third node, wherein the third node is a total control node of a relay network architecture, or an IAB donor a previous-stage node of a first node, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

Optionally, in the first node, when the processor executes the program, the following steps are further implemented: and after receiving the successful receiving feedback information of the second node aiming at the first RLC PDU in the at least two RLC PDUs, discarding and canceling the sending of other RLC PDUs except the first RLC PDU in the at least two repeated RLC PDUs.

Optionally, in the first node, when the processor executes the program, the following steps are further implemented: receiving an activating/deactivating command repeatedly transmitted by RLC sent by a fourth node, wherein the fourth node is an IAB donor, the second node, or, a previous-stage node of the first node; and activating/deactivating the RLC repeated transmission of the corresponding bearer according to the activating/deactivating command of the RLC repeated transmission.

The present invention also provides a data transmission device, which is applied to a second node in a relay network architecture for data transmission through a relay node, and comprises:

a receiving module, configured to receive at least one RLC PDU sent by a first node;

a duplicate elimination module, configured to perform duplicate elimination processing on the RLC PDU in the RLC layer when the same RLC PDU exists in the at least one RLC PDU;

The present invention also provides a second node, comprising: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor;

the processor implements the following steps when executing the program:

receiving at least one RLC PDU sent by a first node;

Optionally, in the second node, when the processor executes the program, the following steps are further implemented: after receiving the at least one RLC PDU, sending successful reception feedback information for the at least one RLC PDU to the first node.

Optionally, in the second node, when the processor executes the program, the following steps are further implemented: receiving configuration information sent by a third node, where the third node may be a master control node in a relay network architecture, or an IAB donor, or a first node, or a higher-level node of a second node, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

Optionally, in the second node, when the processor executes the program, the following steps are further implemented: receiving an activating/deactivating command repeatedly transmitted by RLC sent by a fourth node, wherein the fourth node is an IAB donor, the first node, or a previous-stage node of the first node;

The present invention also provides a data transmission device, which is applied to a third node in a relay network architecture for data transmission through a relay node, and comprises:

a configuration information sending module, configured to send configuration information of RLC repeated transmission to a first node, where the first node is a sending end node in the RLC repeated transmission, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

The present invention also provides a third node, comprising: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor;

the processor implements the following steps when executing the program:

sending configuration information of RLC repeated transmission to a first node, wherein the first node is a sending end node in the RLC repeated transmission, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

Optionally, in the third node, when the processor executes the program, the following steps are further implemented: and sending configuration information of the RLC repeated transmission to a second node, wherein the second node is a receiving end node in the RLC repeated transmission.

Optionally, in the third node, when the processor executes the program, the following steps are further implemented: before sending configuration information of RLC repeated transmission to a first node, selecting at least one hop needing the RLC repeated transmission from an end-to-end multi-hop transmission link, and taking a sending end node in each selected hop as the first node.

The present invention further provides a data transmission device, which is applied to a fourth node in a relay network architecture for performing data transmission through a relay node, and includes:

a command sending module, configured to send an activation/deactivation command of RLC retransmission to a first node;

The present invention also provides a fourth node, comprising: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor;

the processor implements the following steps when executing the program:

sending an activation/deactivation command for RLC repeated transmission to the first node;

Optionally, in the fourth node, when the processor executes the program, the following steps are further implemented: the point sends an activation/deactivation command of RLC repeated transmission to a second node, wherein the second node is a receiving end node in the RLC repeated transmission.

Embodiments of the present invention also provide a computer storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method described above.

The embodiment of the invention has the beneficial effects that: the embodiment of the invention realizes the repeated transmission of the RLC PDU by taking the hop as a unit, and can avoid the resource waste caused by the adoption of the end-to-end PDCP repeated transmission while realizing the reliability of data transmission.

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 schematic diagram of a prior art CA model for repeated transmissions;

FIG. 2 is a schematic diagram of a DC model of a repetitive transmission of the prior art;

FIG. 3 is a schematic diagram of an IAB architecture of the prior art;

fig. 4 is a flowchart illustrating a data transmission method according to an embodiment of the present invention applied to a first node;

fig. 5 is a flowchart illustrating a data transmission method according to an embodiment of the present invention applied to a second node;

fig. 6 is a flowchart illustrating a data transmission method according to an embodiment of the present invention applied to a third node;

fig. 7 is a flowchart illustrating a data transmission method according to an embodiment of the present invention applied to a fourth node;

fig. 8 is a schematic diagram of example 1 of a data transmission method according to an embodiment of the present invention;

FIGS. 9-12 are some schematic diagrams of the BAP control PDU formats according to embodiments of the present invention;

fig. 13 is a schematic diagram of example 2 of a data transmission method according to an embodiment of the present invention;

fig. 14 is a structural view of a data transmission apparatus according to an embodiment of the present invention;

FIG. 15 is a block diagram of a first node in accordance with an embodiment of the present invention;

fig. 16 is still another block diagram of a data transmission apparatus according to an embodiment of the present invention;

fig. 17 is a structural diagram of a second node according to an embodiment of the present invention;

fig. 18 is still another block diagram of a data transmission apparatus according to an embodiment of the present invention;

fig. 19 is a structural diagram of a third node according to the embodiment of the present invention;

fig. 20 is still another block diagram of a data transmission apparatus according to an embodiment of the present invention;

fig. 21 is a structural diagram of a fourth node 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 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.

The embodiment of the invention provides a data transmission method, which can be applied to a relay network architecture for data transmission through a relay node, such as shown in fig. 3. The method introduces the repeated transmission of the RLC layer (also called RLC repeated transmission) between adjacent nodes of the relay network architecture, wherein the adjacent nodes can comprise an IAB donor, an IAB intermediate node and a terminal. The RLC repeated transmission may specifically include: and copying the RLC PDUs to obtain at least two RLC PDUs and submitting the RLC PDUs to a lower layer. For example, the RLC PDU is copied in the RLC layer, and a plurality of RLC PDUs obtained by the copying are delivered to the MAC layer.

In addition, it should be noted that, although a multi-hop relay network architecture is mainly taken as an example for description herein, the data transmission method provided in the embodiment of the present invention may also be adapted to a network architecture that only includes a pair of transceiving ends, for example, a network architecture in which a terminal directly connects to an IAB donor without passing through any IAB node.

While the PDCP retransmission in the prior art can be regarded as an end-to-end retransmission, for example, a retransmission between a terminal and an IAB donor, the RLC retransmission introduced in the embodiment of the present invention is a retransmission between adjacent nodes in a transmission path. By introducing RLC repeat transmission, the embodiment of the present invention can implement reliability control of per-hop transmission, for example, RLC repeat transmission can be performed only in a certain hop/certain hops in a transmission path, and compared with end-to-end PDCP repeat transmission, the above-mentioned RLC repeat transmission based on per-hop can avoid resource waste caused by end-to-end repeat transmission.

Specifically, in the data transmission method according to the embodiment of the present invention, the same RLC PDU is repeatedly transmitted between adjacent nodes, where the adjacent nodes include a transmitting end node that repeatedly transmits the RLC PDU and a receiving end node that receives the repeatedly transmitted RLC PDU, and the adjacent nodes include:

A) at a sender node:

(1) the sending end node transmits more than one identical RLC PDU at the air interface, that is, the same PDCP PDU is carried, RLC PDUs with the same RLC SN (sequence number) and the same LCID (logical channel identity) when the MAC PDUs are organized.

(2) When the transmitting end node transmits the same RLC PDUs, the MAC layer multiplexes these same RLC PDUs into different MAC PDUs. Further, the same RLC PDU may be mapped to different carriers or carrier groups for transmission through higher layer configuration (e.g., RRC configuration or F1-AP configuration).

B) At the receiving end node:

(1) the receiving end node may perform duplicate erasure at the RLC layer after receiving the same RLC PDU.

(2) The receiving end node can send successful receiving feedback information after receiving one RLC PDU, such as RLC ARQ; the transmitting end node may stop transmitting other identical RLC PDUs after receiving the successful reception feedback information.

In addition, whether the RLC retransmission is performed between the adjacent nodes in the embodiment of the present invention is controlled hop-by-hop, that is, each pair of the sending end node/receiving end node is configured and activated for RLC retransmission, respectively.

Specifically, in the embodiment of the present invention, the RLC retransmission between adjacent nodes may be configured by the master control node of the relay network architecture, or the IAB donor the previous node of the sender node. The following description will be given mainly by taking an example of the configuration of IAB donor. For example, the IAB donor may perform RLC duplicate transmission configuration on the neighboring node through RRC signaling or F1-AP signaling. The configuration information of RLC repeated transmissions sent by the IAB donor to the sender node and/or the receiver node may comprise one or a combination of the following information:

1) an RLC entity number or a logical channel number (LCID) for RLC repeated transmission between adjacent nodes;

2) the target terminal for which the RLC repeatedly transmits;

3) the target bearer for which the RLC repeatedly transmits;

4) different carriers or carrier groups used for transmitting the same RLC PDU;

5) the initial state of RLC retransmission is active or inactive, i.e., whether RLC retransmission is in an active state or an inactive state after RLC retransmission configuration.

Usually, the configuration information at least includes at least one of the 1 st to 3 rd information, and the 4 th to 5 th information may be configured according to specific needs.

In the embodiment of the present invention, the activation of RLC repeated transmission between adjacent nodes may be implemented in one of the following manners:

the first method is as follows: the RLC is always active after repeated transmission configuration.

In this manner, RLC retransmission typically needs to be reconfigured through RRC signaling or F1-AP signaling.

The second method comprises the following steps: BAP layer activation/deactivation RLC repeated transmission:

1) sending BAP control command by IAB donor a sending end node in adjacent nodes or a receiving end node in adjacent nodes or a superior node of the sending end node, and activating/deactivating configured RLC repeated transmission;

2) the BAP control commands may include one or more of the following: the RLC entity identification or the logical channel identification of the RLC repeated transmission; the RLC repeatedly transmits a corresponding carrier or carrier group indication; the target terminal identification of the activated/deactivated RLC repeated transmission; and the target bearing identification of the activated/deactivated RLC repeated transmission.

The third method comprises the following steps: RLC layer activation/deactivation of RLC retransmission

1) Sending RLC control PDU by IAB donor a sending end node in an adjacent node or a receiving end node in the adjacent node or a superior node of the sending end node, and activating/deactivating configured RLC repeated transmission;

2) RLC control PDUs used to activate/deactivate RLC retransmission include one or more of the following: the RLC entity identification or the logical channel identification of the RLC repeated transmission; the RLC repeatedly transmits a corresponding carrier or carrier group indication; the target terminal identification of the activated/deactivated RLC repeated transmission; and the target bearing identification of the activated/deactivated RLC repeated transmission.

The method is as follows: MAC layer activation/deactivation RLC retransmission

1) Sending MAC CE (media access control layer control unit) by an IAB donor a sending end node in an adjacent node or a receiving end node in the adjacent node or a superior node of the sending end node, and activating/deactivating configured RLC repeated transmission;

2) the MAC CE for activating/deactivating RLC retransmission includes one or more of the following: the RLC entity identification or the logical channel identification of the RLC repeated transmission; the RLC repeatedly transmits a corresponding carrier or carrier group indication; the target terminal identification of the activated/deactivated RLC repeated transmission; and the target bearing identification of the activated/deactivated RLC repeated transmission.

In the embodiment of the present invention, the activation/deactivation command may include a plurality of fields (fields), for example, a header field including a command for indicating that the command is a command for activating/deactivating RLC retransmission.

In addition, when the activation/deactivation command is used for RLC repeated transmission for activating/deactivating at least one RLC entity, the activation/deactivation command may further include the following fields: 1) at least one RLC entity indication field for indicating activation/deactivation of RLC repeated transmission of a corresponding RLC entity; 2) and the carrier indication domain corresponding to each RLC indication domain is used for indicating the carrier used by the corresponding RLC entity for repeatedly transmitting the RLC PDU.

When the activation/deactivation command is used for activating/deactivating RLC repeated transmission of a target terminal and/or a target bearer, the activation/deactivation command further includes the following fields: 1) a terminal indication field for indicating a target terminal for activating/deactivating RLC repeated transmission; 2) a bearer indication field for indicating activation/deactivation of a target bearer for RLC repeated transmission; 3) an RLC indication field for indicating the RLC entity which activates/deactivates RLC repeated transmission; 4) and the carrier indication field is used for indicating a carrier or a carrier group used by the copied data of the corresponding RLC entity or RLC PDU.

The specific format of the activation/deactivation control command that may be used in the embodiments of the present invention will be described in detail by way of example hereinafter.

The data transmission method according to the embodiment of the present invention will be described separately from each node.

As shown in fig. 4, when applied to a first node in a relay network architecture for performing data transmission through a relay node, a data transmission method provided in an embodiment of the present invention includes:

step 41, the first node performs RLC retransmission on a radio link layer control protocol data unit, RLC PDU, where the RLC retransmission includes: and copying the RLC PDUs to obtain at least two RLC PDUs and submitting the RLC PDUs to a lower layer.

Step 42, mapping the at least two RLC PDUs to different media access control layer protocol data units (MAC PDUs) and then sending the RLC PDUs to a second node;

here, the first node and the second node are adjacent nodes in the relay network architecture, and the first node may be an IAB donor, an IAB intermediate node, or a terminal in the relay network architecture. For example, when the first node is an IAB donor, the second node may be an IAB intermediate node; when the first node is an IAB intermediate node (e.g., IAB node #1, IAB node #2, or IAB node #3 in fig. 3), the second node may be a terminal, an IAB intermediate node, or an IAB node; when the first node is a terminal, the second node may be an IAB intermediate node.

In step 41, the first node may copy RLC PDUs in the RLC layer, and deliver the copied RLC PDUs to the MAC layer.

In the step 42, the first node may map the at least two RLC PDUs to different MAC PDUs to obtain at least two MAC PDUs; and then, according to a preset carrier or a carrier group capable of repeatedly transmitting the RLC PDU, mapping different MAC PDUs onto different carriers or carrier groups so as to send the different MAC PDUs to the second node.

Through the steps, the embodiment of the invention realizes the repeated transmission of the RLC PDU by taking the hop as a unit, so that the repeated transmission of the RLC PDU can be carried out by taking the selected transmitting end node of each hop as a first node and the receiving end node as a second node according to the requirements, such as selecting a certain hop or certain hops with poor link quality (lower than a certain preset quality threshold) in a transmission link, thereby realizing the reliability of data transmission and avoiding the resource waste caused by adopting the repeated transmission of the end-to-end PDCP.

In addition, in order to reduce unnecessary RLC retransmission and reduce resource waste, after receiving feedback information (such as RLC ARQ) of successful reception of a first RLC PDU of the at least two RLC PDUs by the second node, the first receiving may discard and cancel transmission of other RLC PDUs of the at least two RLC PDUs except the first RLC PDU, that is, cancel transmission of the other RLC PDUs if other RLC PDUs identical to the first RLC PDU are not transmitted yet.

According to at least one embodiment of the present invention, before step 41, RLC retransmission needs to be configured for the first node, in this case, the first node may further receive configuration information of RLC retransmission sent by a third node, where the third node is an overall control node of a relay network architecture, or an IAB node, or a previous node of the first node, and the configuration information may specifically include at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

In some scenarios, after RLC retransmission is configured, an activation command is further required to activate corresponding RLC retransmission. Similarly, after RLC retransmission is activated, if RLC retransmission needs to be cancelled, a deactivation command needs to be used to deactivate corresponding RLC retransmission. Therefore, the first node in the embodiment of the present invention may further receive an activation/deactivation command repeatedly transmitted by an RLC from a fourth node, where the fourth node is an IAB donor, the second node, or, a previous node of the first node; and then, activating/deactivating the RLC repeated transmission of the corresponding bearer according to the activating/deactivating command of the RLC repeated transmission.

Here, the activation/deactivation command may be one or more of a BAP control command, an RLC control PDU, or a MAC CE. The activation/deactivation command is used to represent an activation command or a deactivation command. Specifically, the activation/deactivation command includes at least one of the following: the RLC entity identification or the logical channel identification of the RLC repeated transmission; the RLC repeatedly transmits a corresponding carrier or carrier group indication; the target terminal identification of the activated/deactivated RLC repeated transmission; and the target bearing identification of the activated/deactivated RLC repeated transmission.

In addition, the content of the specific field included in the activation/deactivation command may refer to the foregoing description, and is not described herein again for brevity.

Referring to fig. 5, when the data transmission method provided in the embodiment of the present invention is applied to a second node in a relay network architecture for performing data transmission through a relay node, the method includes:

and step 51, the second node receives at least one RLC PDU sent by the first node.

And step 52, when the at least one RLC PDU has the same RLC PDU, performing the repeated elimination processing of the RLC PDU in the RLC layer.

Through the steps, the second node can receive at least one RLC PDU sent by the first node, and the RLC PDU duplicate elimination processing is carried out on the RLC layer, so that the receiving end processing of the RLC PDU duplicate transmission is realized.

In addition, in this embodiment of the present invention, after receiving the at least one RLC PDU, the second node sends, to the first node, successful reception feedback information for the at least one RLC PDU, where the successful reception feedback information may specifically be an RLC status report.

In this embodiment of the present invention, for a second node at a receiving end, RLC retransmission may also be configured for the second node, at this time, the second node may further receive configuration information sent by a third node, where the third node may be a master control node in a relay network architecture, or an IAB donor a first node, or a previous node of the second node, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits; the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

Similarly, whether RLC retransmission of the second node is activated or not may be controlled by an activation/deactivation command, and at this time, the second node may receive the activation/deactivation command of RLC retransmission sent by a fourth node, where the fourth node is an IAB donor, the first node, or, a previous node of the first node; and activating/deactivating the RLC repeated transmission of the corresponding bearer according to the activating/deactivating command of the RLC repeated transmission.

The activation/deactivation command may be one or more of a BAP control command, an RLC control PDU, or a MAC CE, and the content included therein may refer to the foregoing description, which is not described herein again.

Referring to fig. 6, when the data transmission method provided in the embodiment of the present invention is applied to a third node in a relay network architecture for performing data transmission through a relay node, the method includes:

step 61, the third node sends configuration information of RLC repeated transmission to the first node, where the first node is a sending end node in the RLC repeated transmission, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

Through the above steps, the third node may configure RLC PDU retransmission for the first node, so as to reduce resource overhead caused by using PDCP PDU retransmission.

In addition, the third node may further send configuration information of the RLC repeated transmission to a second node, where the second node is a receiving node in the RLC repeated transmission.

Further, the third node may select at least one hop requiring RLC retransmission from the end-to-end multi-hop transmission links, use the sending end node in each selected hop as the first node and the second node, for example, select a hop (which may be a certain hop or some hops) with poor link quality (e.g., lower than a certain preset quality threshold) in the target transmission link, use the sending end node in each selected hop as the first node, use the receiving end node as the second node, and send configuration information of RLC retransmission to the first node and/or the second node.

Referring to fig. 7, when the data transmission method provided in the embodiment of the present invention is applied to a fourth node in a relay network architecture for performing data transmission through a relay node, the method includes:

step 71, the fourth node sends an activating/deactivating command of RLC repeated transmission to the first node;

Through the steps, the embodiment of the invention can realize the activation/deactivation control of the RLC repeated transmission.

Further, the fourth node may further send an activation/deactivation command of RLC repeated transmission to a second node, where the second node is a receiving node in the RLC repeated transmission.

The data transmission method according to the embodiment of the present invention is implemented in each node. Several examples of data transmission methods to which embodiments of the invention may be applied are further provided below in conjunction with the figures.

Example 1: RLC repeated transmission of downlink data between IAB node #1 and IAB node #2

Referring to fig. 8, example 1 includes the following steps:

step A: the IAB node sends RRC signaling or F1-AP signaling to IAB node #2, the IAB node #2 is configured to send data to IAB node #1 by RLC repeated transmission, and the configuration content can be one or more of the following:

1) all RLC entities between the IAB node #2DU and the IAB node #1MT carry out RLC repeated transmission; or, a specific RLC entity between the IAB node #2DU and the IAB node #1MT is designated to carry out RLC repeated transmission;

2) appointing UE ID, and performing RLC repeated transmission on the data of the UE;

3) an RB ID is specified, and RLC repeated transmission is performed on data of the RB.

In addition, the configuration signaling may also be sent to IAB node # 1.

Step B (optional step): IAB node or IAB node #1 sends a command to activate RLC retransmission to IAB node #2, which may be specifically a BAP control PDU, or an RLC control PDU, or a MAC CE.

The activation command includes the content described above with reference to the activation command. In the actually used BAP control PDU, the bit number of each kind of information in the figure may be changed according to the content indicated by the need. In addition, in a mode of performing RLC retransmission activation/deactivation by using an RLC command or an MAC control unit, the specific contents of the activation/deactivation control command format are similar to that of the corresponding header format except that the header format is replaced by an RLC header and an MAC subheader, and thus, for saving space, details are not repeated.

Format 1 of BAP control PDU:

this format 1 may be used to activate/deactivate RLC repeat transmissions for a single RLC entity. As shown in fig. 9, the format 1 includes:

BAP head: the indication information containing the BAP layer, for example, the BAP control PDU indicating that the current BAP PDU is activating/deactivating RLC repeated transmission, and specifically, activation or deactivation can be indicated in a BAP header;

RLC ID: activating/deactivating an RLC ID of RLC retransmission;

CC 1-CC 3 carrier bitmap indicates, for example, CC 1-0 indicates that the repeated transmission of the corresponding RLC entity cannot be transmitted using CC1, and CC 1-1 indicates that the repeated transmission of the corresponding RLC entity can be transmitted using CC 1; or, for example, CC1 ═ 0 indicates that the carrier cannot be used by the first backup of RLC PDUs and the carrier can only be used by the second backup.

Format 2 of BAP control PDU:

this format 2 may be used to activate/deactivate RLC retransmission for all RLC entities. Fig. 10 and 11 provide two examples of format 2, and format 2 as shown in fig. 10 includes:

RLC ID: activating/deactivating an RLC ID of RLC retransmission;

The format 2 shown in fig. 11 then includes:

RLC bitmap: unlike BAP control PDU format 2, the RLC indication is not an RLC ID, but a corresponding RLC entity is indicated with 1 bitmap.

Format 3 of BAP control PDU:

this format 3 may be used to activate/deactivate RLC retransmission for a specific terminal or a specific service.

In an IAB node, one RLC entity may carry data of multiple terminals and/or multiple Radio Bearers (RBs), and a part of the data in one RLC entity may be configured for RLC retransmission. Thus, a terminal identity and/or a bearer identity may be added. Fig. 12 is a schematic diagram of a BAP control PDU format 3, and the lengths of the UE ID, RB ID, and RLC ID fields in fig. 12 are only schematic, and the lengths of the fields in specific use may be adaptively changed as needed. As shown in fig. 12, the format 3 includes:

UE ID: data indicating a specific terminal may be RLC retransmitted. The UE ID is a UE identity that can be uniquely identified between IAB nodes in the IAB architecture, and is not required to be a unique identity of the UE in a larger range. For example, in the IAB architecture, only bearers of 16 UEs are configured to perform RLC retransmission, and the UE ID is 4 bits;

RB ID: indicating a bearer on which RLC retransmission is possible;

RLC ID: activating/deactivating an RLC ID of RLC retransmission;

And C: according to the RLC duplicate transmission activation condition, for the RLC entities from the designated IAB node #2 to the IAB node #1, and/or the data of the designated UE, and/or the data of the designated load, the IAB node #2 copies the RLC PDUs by the number of copies required by the duplicate transmission on the DU side, each RLC PDU is transmitted on a different MAC PDU, and if the carrier of the RLC PDU duplicate transmission is specified, different backups of the RLC PDUs are mapped to different carriers for transmission.

Step D: the IAB node #1MT side receives RLC PDUs, and repeatedly eliminates the RLC PDUs which are repeatedly received; further, after receiving an RLC PDU, the IAB node #1MT side may send positive feedback to the IAB node #2, and the IAB node #2 stops transmission of other backups of the RLC PDU.

Example 2: RLC repeated transmission of uplink data between IAB node #1 and IAB node #2

Referring to fig. 13, this example 2 includes the following steps:

step a: the IAB node sends RRC signaling or F1-AP signaling to IAB node #1, the IAB node #1 is configured to send data to IAB node #2 by RLC repeated transmission, and the configuration content can be one or more of the following. The configuration signaling may be sent optionally to IAB node # 2.

1) All RLC entities between the IAB node #1MT and the IAB node #2DU carry out RLC repeated transmission; or, a specific RLC entity between the IAB node #1MT and the IAB node #2DU is designated for RLC retransmission;

3) and assigning the RB ID, and performing RLC repeated transmission on the time of the bearer.

Step b (optional step): the IAB node or IAB node #2 sends a command to activate RLC retransmission to IAB node #1, specifically, BAP control PDU, RLC control PDU, or MAC CE, and the specific format and activation content refer to the above description of the activation command.

Step c: according to the RLC retransmission activation condition, for the designated IAB node #1 to IAB node #2 RLC entities, and/or designated UE data, and/or designated loaded data, IAB node #1 copies the RLC PDUs by the number of copies required for retransmission on MT side, each RLC PDU is transmitted on a different MAC PDU, and if the carrier of RLC PDU retransmission is specified, different backups of the RLC PDUs are mapped to different carriers for transmission.

Step d: the IAB node #2DU side receives RLC PDUs, and the repeatedly received RLC PDUs are repeatedly eliminated; further, after receiving one RLC PDU at the IAB node #2DU side, the IAB node #1 may send positive feedback, and the IAB node #1 stops transmission of other backups of the RLC PDU.

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

Referring to fig. 14, an embodiment of the present invention provides a data transmission apparatus 140, which can be applied to a first node in a relay network architecture for performing data transmission through a relay node, and specifically includes:

an RLC retransmission module 141, configured to perform RLC retransmission on a radio link layer control protocol data unit RLC PDU, where the RLC retransmission includes: copying the RLC PDUs to obtain at least two RLC PDUs and submitting the RLC PDUs to a lower layer;

a mapping processing module 142, configured to map the at least two RLC PDUs to different MAC PDUs and send the mapped MAC PDUs to a second node;

Optionally, the mapping processing module 142 is further configured to map the at least two RLC PDUs to different MAC PDUs to obtain at least two MAC PDUs; and mapping different MAC PDUs onto different carriers or carrier groups according to preset carriers or carrier groups capable of repeatedly transmitting the RLC PDUs, and sending the different MAC PDUs to the second node.

Optionally, the data transmission device 140 further includes:

a first receiving module (not shown in the figure), configured to receive configuration information repeatedly transmitted by an RLC, where the configuration information is sent by a third node, where the third node is an overall control node of a relay network architecture, or an IAB node, or a node higher than the first node, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

Optionally, the mapping processing module 142 is further configured to discard and cancel sending of other RLC PDUs except for the first RLC PDU in the at least two repeated RLC PDUs after receiving the feedback information that the second node successfully receives the first RLC PDU of the at least two RLC PDUs.

Optionally, the data transmission device 140 further includes:

a second receiving module (not shown in the figure), configured to receive an activation/deactivation command repeatedly transmitted by RLC from a fourth node, where the fourth node is an IAB donor, the second node, or, a node higher than the first node; and activating/deactivating the RLC repeated transmission of the corresponding bearer according to the activating/deactivating command of the RLC repeated transmission.

For the specific content and format included in the activation/deactivation command, reference may be made to the foregoing description, and details are not repeated here.

Referring to fig. 15, an embodiment of the present invention provides a structural diagram of a first node 1500, including: a processor 1501, a transceiver 1502, a memory 1503, and a bus interface, wherein:

in this embodiment of the present invention, the first node 1500 further includes: a program stored on memory 1503 and executable on processor 1501, which when executed by processor 1501, performs the steps of:

It can be understood that, in the embodiment of the present invention, when being executed by the processor 1501, the computer program can implement the processes of the data transmission method embodiment shown in fig. 4, and can achieve the same technical effects, and details are not described here to avoid repetition.

In fig. 15, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1501, and various circuits, represented by memory 1503, 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 1502 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 1501 is responsible for managing a bus architecture and general processing, and the memory 1503 may store data used by the processor 1501 in performing operations.

In some embodiments of the invention, there is also provided a computer readable storage medium having a program stored thereon, which when executed by a processor, may implement the following steps on a first node:

When executed by the processor, the program can implement all the implementation manners in the data transmission method applied to the first node, and can achieve the same technical effect, and is not described herein again to avoid repetition.

Referring to fig. 16, an embodiment of the present invention provides a data transmission apparatus 160, which can be applied to a second node in a relay network architecture for performing data transmission through a relay node, and specifically includes:

a receiving module 161, configured to receive at least one RLC PDU sent by a first node;

a duplicate elimination module 162, configured to perform duplicate elimination processing on RLC PDUs in the RLC layer when the same RLC PDU exists in the at least one RLC PDU;

Optionally, the data transmission device 160 further includes:

a sending module (not shown in the figure) configured to send, to the first node, successful reception feedback information for the at least one RLC PDU after receiving the at least one RLC PDU.

Optionally, the receiving module 161 is further configured to receive configuration information sent by a third node, where the third node may be a total control node in a relay network architecture, or an IAB donor, a first node, or a higher-level node of a second node, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

Optionally, the receiving module 161 is further configured to receive an activation/deactivation command repeatedly transmitted by RLC from a fourth node, where the fourth node is an IAB donor the first node, or a node at the previous stage of the first node; and activating/deactivating the RLC repeated transmission of the corresponding bearer according to the activating/deactivating command of the RLC repeated transmission.

Referring to fig. 17, an embodiment of the present invention provides a structural diagram of a second node 1700, including: a processor 1701, a transceiver 1702, a memory 1703, and a bus interface, wherein:

in this embodiment of the present invention, the second node 1700 further includes: a program stored on a memory 1703 and executable on a processor 1701, which when executed by the processor 1701 performs the steps of:

receiving at least one RLC PDU sent by a first node;

It is understood that, in the embodiment of the present invention, when being executed by the processor 1701, the computer program can implement the processes of the data transmission method embodiment shown in fig. 5, and can achieve the same technical effects, and the details are not repeated herein in order to avoid repetition.

In fig. 17, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 1701, and various circuits, represented by the memory 1703, 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 1702 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 1701 is responsible for managing a bus architecture and general processing, and the memory 1703 may store data used by the processor 1701 in performing operations.

In some embodiments of the invention, there is also provided a computer readable storage medium having a program stored thereon, which when executed by a processor, can implement the following steps on a second node:

receiving at least one RLC PDU sent by a first node;

When executed by the processor, the program can implement all the implementation manners of the data transmission method applied to the second node, and can achieve the same technical effect, and is not described herein again to avoid repetition.

Referring to fig. 18, an embodiment of the present invention provides a data transmission apparatus 180, which can be applied to a third node in a relay network architecture for performing data transmission through a relay node, and specifically includes:

a configuration information sending module 181, configured to send configuration information of RLC repeated transmission to a first node, where the first node is a sending end node in the RLC repeated transmission, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

Optionally, the configuration information sending module 181 is further configured to send, by the third node, the configuration information of the RLC repeated transmission to a second node, where the second node is a receiving node in the RLC repeated transmission.

Optionally, the data transmission device 180 further includes:

and the selection module is used for selecting at least one hop which needs to be subjected to RLC repeated transmission from the end-to-end multi-hop transmission link, and taking the sending end node in each selected hop as the first node.

Referring to fig. 19, an embodiment of the invention provides a structural diagram of a third node 1900, including: a processor 1901, a transceiver 1902, a memory 1903, and a bus interface, wherein:

in an embodiment of the present invention, the third node 1900 further includes: a program stored on the memory 1903 and executable on the processor 1901, the program when executed by the processor 1901 performing the steps of:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

It can be understood that, in the embodiment of the present invention, when being executed by the processor 1901, the computer program can implement the processes of the data transmission method embodiment shown in fig. 6, and can achieve the same technical effects, and details are not repeated here to avoid repetition.

In FIG. 19, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1901, and various circuits, represented by memory 1903, 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 1902 may be a plurality of elements including a transmitter and a receiver providing a means for communicating with various other apparatus over a transmission medium.

The processor 1901 is responsible for managing the bus architecture and general processing, and the memory 1903 may store data used by the processor 1901 in performing operations.

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

When executed by the processor, the program can implement all the implementation manners in the data transmission method applied to the third node, and can achieve the same technical effect, and is not described herein again to avoid repetition.

Referring to fig. 20, an embodiment of the present invention provides a data transmission apparatus 200, which can be applied to a fourth node in a relay network architecture for performing data transmission through a relay node, and specifically includes:

a command sending module 201, configured to send an activation/deactivation command of RLC retransmission to the first node;

Optionally, the command sending module 201 is further configured to send an activation/deactivation command of RLC repeated transmission to a second node, where the second node is a receiving node in the RLC repeated transmission.

Referring to fig. 21, an embodiment of the invention provides a structural diagram of a first node 2100, including: a processor 2101, a transceiver 2102, a memory 2103, and a bus interface, wherein:

in an embodiment of the present invention, the first node 2100 further includes: a program stored 2103 on the memory and executable on the processor 2101, the program when executed by the processor 2101, implementing the steps of:

It can be understood that, in the embodiment of the present invention, when being executed by the processor 2101, the computer program may implement the processes of the data transmission method embodiment shown in fig. 7, and achieve the same technical effects, and is not described herein again to avoid repetition.

In FIG. 21, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 2101, and various circuits of memory, represented by the memory 2103, 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 2102 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium.

The processor 2101 is responsible for managing the bus architecture and general processing, and the memory 2103 may store data used by the processor 2101 when performing operations.

In some embodiments of the invention, there is also provided a computer readable storage medium having a program stored thereon, which when executed by a processor, can implement the following steps on a fourth node:

When executed by the processor, the program can implement all the implementation manners of the data transmission method applied to the fourth node, and can achieve the same technical effect, and is not described herein again to avoid repetition.

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 a first node in a relay network architecture for data transmission through a relay node, and is characterized by comprising the following steps:

2. The method of claim 1, wherein the transmitting the at least two RLC PDUs to the second node after mapping the at least two RLC PDUs to different MAC PDUs comprises:

3. The method of claim 1, wherein prior to copying the number of copies required of the RLC PDU for which the RLC retransmission is intended, the method further comprises:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

4. The method of claim 1, wherein upon receiving successful reception feedback information for a first RLC PDU of the at least two RLC PDUs by a second node, the method further comprises:

5. The method of claim 1, further comprising:

6. The method of claim 5, wherein the activation/deactivation command is one or more of a backhaul adaptation protocol, BAP, control command, RLC control PDU, or a media access control layer control element, MAC CE.

7. The method of claim 5 or 6, wherein the activation/deactivation command comprises at least one of:

8. The method of claim 7,

the activation/deactivation command includes: a header field for indicating that the present command is a command for activating/deactivating RLC retransmission; wherein the content of the first and second substances,

9. A data transmission method is applied to a second node in a relay network architecture for data transmission through a relay node, and is characterized by comprising the following steps:

the second node receives at least one RLC PDU sent by the first node;

10. The method of claim 9, further comprising:

11. The method of claim 9, further comprising:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

12. The method of claim 9, further comprising:

13. The method of claim 12, wherein the activation/deactivation command is one or more of a backhaul adaptation protocol, BAP, control command, RLC control PDU, or a medium access control layer control element, MAC CE.

14. The method of claim 12 or 13, wherein the activation/deactivation command comprises at least one of:

15. The method of claim 14,

16. A data transmission method applied to a third node in a relay network architecture for performing data transmission via a relay node, the method comprising:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

17. The method of claim 16, further comprising:

18. The method of claim 16, wherein prior to sending RLC repeatedly transmitted configuration information to the first node, the method further comprises:

19. A data transmission method applied to a fourth node in a relay network architecture for performing data transmission via a relay node, the method comprising:

20. The method of claim 19, further comprising:

21. A data transmission apparatus applied to a first node in a relay network architecture for performing data transmission via a relay node, comprising:

22. A first node, comprising: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the processor implements the following steps when executing the program:

23. The first node of claim 22, wherein the processor when executing the program further performs the steps of: mapping the at least two RLC PDUs to different MAC PDUs to obtain at least two MAC PDUs; and mapping different MAC PDUs onto different carriers or carrier groups according to preset carriers or carrier groups capable of repeatedly transmitting the RLC PDUs, and sending the different MAC PDUs to the second node.

24. The first node of claim 22,

the processor, when executing the program, further implements the steps of: before copying the required number of parts of the RLC PDU for the RLC repeated transmission, receiving configuration information of the RLC repeated transmission sent by a third node, wherein the third node is a total control node of a relay network architecture, or an IAB donor a previous-stage node of a first node, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

25. The first node of claim 22,

the processor, when executing the program, further implements the steps of: and after receiving the successful receiving feedback information of the second node aiming at the first RLC PDU in the at least two RLC PDUs, discarding and canceling the sending of other RLC PDUs except the first RLC PDU in the at least two repeated RLC PDUs.

26. The first node of claim 22,

the processor, when executing the program, further implements the steps of: receiving an activating/deactivating command repeatedly transmitted by RLC sent by a fourth node, wherein the fourth node is an IAB donor, the second node, or, a previous-stage node of the first node; and activating/deactivating the RLC repeated transmission of the corresponding bearer according to the activating/deactivating command of the RLC repeated transmission.

27. A data transmission apparatus, applied to a second node in a relay network architecture for performing data transmission via a relay node, includes:

28. A second node, comprising: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the processor implements the following steps when executing the program:

receiving at least one RLC PDU sent by a first node;

29. The second node of claim 28,

the processor, when executing the program, further implements the steps of: after receiving the at least one RLC PDU, sending successful reception feedback information for the at least one RLC PDU to the first node.

30. The second node of claim 28,

the processor, when executing the program, further implements the steps of: receiving configuration information sent by a third node, where the third node may be a master control node in a relay network architecture, or an IAB donor, or a first node, or a higher-level node of a second node, and the configuration information includes at least one of the following information:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

the RLC repeats an initial state of transmission, which is active or inactive.

31. The second node of claim 28,

the processor, when executing the program, further implements the steps of: receiving an activating/deactivating command repeatedly transmitted by RLC sent by a fourth node, wherein the fourth node is an IAB donor, the first node, or a previous-stage node of the first node;

32. A data transmission apparatus, applied to a third node in a relay network architecture for performing data transmission via a relay node, includes:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

33. A third node, comprising: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the processor implements the following steps when executing the program:

the target terminal for which the RLC repeatedly transmits;

the target bearer for which the RLC repeatedly transmits;

34. The third node of claim 33,

the processor, when executing the program, further implements the steps of: and sending configuration information of the RLC repeated transmission to a second node, wherein the second node is a receiving end node in the RLC repeated transmission.

35. The third node of claim 33,

the processor, when executing the program, further implements the steps of: before sending configuration information of RLC repeated transmission to a first node, selecting at least one hop needing the RLC repeated transmission from an end-to-end multi-hop transmission link, and taking a sending end node in each selected hop as the first node.

36. A data transmission apparatus, applied to a fourth node in a relay network architecture for performing data transmission via a relay node, includes:

37. A fourth node, comprising: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the processor implements the following steps when executing the program:

38. The fourth node of claim 37,

the processor, when executing the program, further implements the steps of: the point sends an activation/deactivation command of RLC repeated transmission to a second node, wherein the second node is a receiving end node in the RLC repeated transmission.

39. A computer storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 20.