CN112436926B

CN112436926B - Data transmission method, device, base station, network node and communication equipment

Info

Publication number: CN112436926B
Application number: CN201910788997.4A
Authority: CN
Inventors: 徐珉
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2023-08-01
Anticipated expiration: 2039-08-26
Also published as: CN112436926A

Abstract

The invention provides a data transmission method, a device, a base station, a network node and communication equipment, wherein the data transmission method comprises the following steps: determining whether relay reverse mapping is started between the target node and the adjacent node according to the capability information between the target node and the adjacent node; if yes, sending relay reverse mapping enabling information to the target node; wherein the capability information comprises uplink and downlink reachability information and/or load information between the target node and a neighboring node. The scheme can support and realize signaling interaction between relay nodes, so that uplink and downlink transmission adopts the same bearing to backhaul relay link mapping, and wireless channel reciprocity is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

Description

Data transmission method, device, base station, network node and communication equipment

Technical Field

The present invention relates to the field of wireless technologies, and in particular, to a data transmission method, a device, a base station, a network node, and a communication device.

Background

With the advent of endless data-type applications such as virtual reality and augmented reality, the current communication network capacity is increasingly unable to meet the demands of people, and network densification becomes an important means for improving the network capacity. The small base stations are densely deployed at stations such as light poles, bus shelter and the like, a return solution with low cost, quick deployment and convenient maintenance is required to be sought, and the wireless Mesh return becomes a very competitive method due to the characteristics of self-configuration, self-optimization and fault self-healing. In order to further improve the utilization of spectrum resources, improve the reliability of the network, provide more accurate QoS (quality of service) management, load balancing and service-based multipath routing, unified access backhaul (Integrated Access and Backhaul, IAB) technology is essential, and has great research value.

The unified access backhaul can be combined with millimeter wave communication technology, so that the problems of high arrival cost, long period and insufficient fiber cores of newly added station optical fibers are solved, and the dependence on the optical fibers is reduced; the indoor high-capacity coverage problem of the optical fiber scene which is not deployed in advance can be solved, the optical fiber or network cable laying requirement is reduced, the large-scale antenna can be applied indoors, and the deployment is flexible and easy; the method can realize manual accurate alignment of one high-frequency macro station to a plurality of micro stations (high or low frequency), and has wide prospect.

The basic structure for an IAB may be as shown in fig. 1, wherein:

donor base station (IAB donor): an anchor point for connecting the optical fiber with a core network;

IAB node (IAB node): a node that is not optical fiber connected with the core network, but can transmit back through a wireless link and can provide an access function; in the standardized research, the access function of the IAB node is called DU function, and the backhaul function is called MT function;

parent node: the last hop node of a certain IAB node;

child node: the next hop node of a certain IAB node;

access link: links between the UE (terminal) and the IAB node or IAB donor base station, including uplink and downlink access links;

backhaul link: the links between the IAB node and the IAB child node or the IAB parent node include an uplink backhaul link and a downlink backhaul link.

In addition, CU-CP in the figure represents a concentration unit-control plane, CU-UP represents a concentration unit-user plane, DU represents a distribution unit, wireline IP represents a wired internet protocol address, wireless backhaul link represents a wireless backhaul link, and Wireless access link represents a wireless access link.

Currently, in wireless communication, uplink and downlink channels have reciprocity under a certain condition, so a pair of relay nodes a and B are next-hop relay nodes of uplink and downlink for a certain terminal or a certain bearer of a certain terminal in a relay network. However, according to the existing mechanism, signaling interaction cannot be performed between relay nodes, and even if there is reciprocity between uplink and downlink channels, the donor node needs to be configured through F1-AP (interface between CU and DU functional entities) interface signaling or RRC signaling respectively, so that waste of signaling resources is caused.

Disclosure of Invention

The invention aims to provide a data transmission method, a data transmission device, a base station, a network node and communication equipment, which solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

In order to solve the above technical problems, an embodiment of the present invention provides a data transmission method, applied to a donor base station, including:

determining whether relay reverse mapping is started between a target node and an adjacent node according to capability information between the target node and the adjacent node;

if yes, sending relay reverse mapping enabling information to the target node;

wherein the capability information comprises uplink and downlink reachability information and/or load information between the target node and a neighboring node;

the target node comprises a relay node, and the adjacent node comprises a relay node and/or a terminal; alternatively, the target node comprises a terminal and the neighboring node comprises a relay node.

Optionally, after sending the relay reverse mapping enabling information to the target node, the method further includes:

and receiving reverse mapping execution confirmation information sent by the target node.

Sending a mapping relation configuration signaling to the target node;

wherein, the mapping relation corresponding to the mapping relation configuration signaling is different from the mapping relation corresponding to the relay reverse mapping enabling information.

The embodiment of the invention also provides a data transmission method which is applied to the target node, wherein the target node comprises a relay node or a terminal and comprises the following steps:

receiving relay reverse mapping enabling information sent by a donor base station;

according to the relay reverse mapping enabling information, first relay reverse mapping indication information is sent to the adjacent node of the target node;

the first relay reverse mapping indication information is used for indicating whether a target mapping relation is adopted between a user equipment bearer and a backhaul link or not when the adjacent node transmits data to the target node;

the target mapping relation is consistent with the mapping relation adopted by the target node for sending the first relay reverse mapping indication information;

in the case that the target node includes a relay node, the neighboring node includes a relay node or a terminal; alternatively, in case the target node comprises a terminal, the neighboring node comprises a relay node.

Optionally, the first relay reverse mapping indication information includes at least 1 bit of content.

Optionally, the first relay reverse mapping indication information is included in a protocol packet header of an adaptation layer of the target node.

Optionally, in the adaptation layer protocol data packet sent by the target node to the neighboring node, the protocol packet header is located before the radio link control protocol RLC layer protocol data packet; or alternatively

The protocol packet header is contained in an adaptation layer protocol control data packet sent by the target node to the neighboring node.

Optionally, the sending, according to the relay reverse mapping enabling information, first relay reverse mapping indication information to a neighboring node of the target node includes:

and according to the relay reverse mapping enabling information, sending first relay reverse mapping indication information to the adjacent node of the target node through an air interface.

Optionally, after sending the first relay reverse mapping indication information to the neighboring node of the target node according to the relay reverse mapping enabling information, the method further includes:

receiving preset information;

updating the mapping relation according to the preset information, and obtaining data transmission completion indication information;

Transmitting the data transmission completion indication information to the adjacent node;

the preset information comprises mapping relation configuration signaling sent by the donor base station or second relay reverse mapping indication information sent by the adjacent node;

and the mapping relation corresponding to the mapping relation configuration signaling is different from the mapping relation adopted by the target node for sending the first relay reverse mapping indication information.

Optionally, the sending the data transmission completion indication information to the neighboring node includes:

transmitting the data transmission completion indication information to the adjacent node in an adaptation layer header of a last data packet transmitted to the adjacent node according to the mapping relation before updating; or alternatively

And after the last data packet is sent to the adjacent node according to the mapping relation before updating, sending the data transmission completion indication information to the adjacent node in the form of a control data packet.

And transmitting reverse mapping execution confirmation information to the donor base station under the condition that the first data transmitted by the adjacent node according to the first relay reverse mapping indication information is received.

The embodiment of the invention also provides a data transmission method applied to the adjacent node, wherein the adjacent node comprises a relay node or a terminal, and the method comprises the following steps:

receiving first relay reverse mapping indication information sent by a target node;

determining a target mapping relation according to the first relay reverse mapping indication information;

Optionally, the receiving the first relay reverse mapping indication information sent by the target node includes:

and receiving first relay reverse mapping indication information sent by the target node through an air interface.

Optionally, the determining, according to the first relay reverse mapping indication information, a target mapping relationship includes:

acquiring user equipment identification information and a bearing identification in a protocol packet header of a first data packet under the condition that a target mapping relation is adopted between a user equipment bearing and a return link when the first relay reverse mapping indication information indicates that the adjacent node transmits data to the target node;

determining a target mapping relation according to the user equipment identification information and the bearing identification;

The first data packet includes an adaptation layer protocol data packet or an adaptation layer protocol control data packet sent by the target node to the adjacent node.

Optionally, after determining the target mapping relationship according to the first relay reverse mapping indication information, the method further includes:

receiving data transmission completion indication information sent by the target node;

and according to the data transmission completion indication, the target mapping relation is not adopted when the second data is sent to the target node.

Optionally, the receiving the data transmission completion indication information sent by the target node includes:

receiving data transmission completion indication information carried by the target node in an adaptation layer header of a last data packet sent to the adjacent node according to the mapping relation; or alternatively

And receiving the data transmission completion indication information sent by the target node in the form of a control data packet after the last data packet is sent to the adjacent node according to the mapping relation.

and sending the first data to the target node according to the target mapping relation.

The embodiment of the invention also provides a data transmission device, which is applied to the donor base station and comprises:

a first determining module, configured to determine, according to capability information between a target node and an adjacent node, whether relay reverse mapping is enabled between the target node and the adjacent node;

the first sending module is used for sending relay reverse mapping enabling information to the target node if yes;

Optionally, the method further comprises:

and the first receiving module is used for receiving reverse mapping execution confirmation information sent by the target node after the relay reverse mapping enabling information is sent to the target node.

Optionally, the method further comprises:

the second sending module is used for sending mapping relation configuration signaling to the target node after sending relay reverse mapping enabling information to the target node;

The embodiment of the invention also provides a data transmission device which is applied to the target node, wherein the target node comprises a relay node or a terminal and comprises the following components:

the second receiving module is used for receiving relay reverse mapping enabling information sent by the donor base station;

a third sending module, configured to send first relay reverse mapping indication information to a neighboring node of the target node according to the relay reverse mapping enabling information;

Optionally, the third sending module includes:

and the first sending submodule is used for sending first relay reverse mapping indication information to the adjacent node of the target node through an air interface according to the relay reverse mapping enabling information.

Optionally, the method further comprises:

a third receiving module, configured to receive preset information after sending first relay reverse mapping indication information to a neighboring node of the target node according to the relay reverse mapping enabling information;

the first processing module is used for updating the mapping relation according to the preset information and obtaining data transmission completion indication information;

a fourth sending module, configured to send the data transmission completion indication information to the neighboring node;

Optionally, the fourth sending module includes:

a second sending sub-module, configured to send the data transmission completion indication information to the neighboring node in an adaptation layer header of a last data packet sent to the neighboring node according to the mapping relation before updating; or alternatively

Optionally, the method further comprises:

and a fifth sending module, configured to send reverse mapping execution acknowledgement information to the donor base station when receiving first data sent by the neighboring node according to the first relay reverse mapping indication information after sending the first relay reverse mapping indication information to the neighboring node of the target node according to the relay reverse mapping enabling information.

The embodiment of the invention also provides a data transmission device which is applied to the adjacent node, wherein the adjacent node comprises a relay node or a terminal and comprises the following components:

A fourth receiving module, configured to receive first relay reverse mapping indication information sent by a target node;

the second determining module is used for determining a target mapping relation according to the first relay reverse mapping indication information;

Optionally, the fourth receiving module includes:

and the first receiving submodule is used for receiving the first relay reverse mapping indication information sent by the target node through the air interface.

Optionally, the second determining module includes:

a first obtaining sub-module, configured to obtain, when the first relay reverse mapping indication information indicates that the neighboring node transmits data to the target node, user equipment identification information and a bearer identification in a protocol packet header of a first data packet in a case that a target mapping relationship is adopted between a user equipment bearer and a backhaul link;

a first determining submodule, configured to determine a target mapping relationship according to the user equipment identification information and the bearer identification;

Optionally, the method further comprises:

a fifth receiving module, configured to receive, after determining a target mapping relationship according to the first relay reverse mapping indication information, data transmission completion indication information sent by the target node;

And the second processing module is used for not adopting the target mapping relation when sending second data to the target node according to the data transmission completion indication.

Optionally, the fifth receiving module includes:

a second receiving sub-module, configured to receive data transmission completion indication information carried by the target node in an adaptation layer header of a last data packet sent to the adjacent node according to the mapping relationship; or alternatively

Optionally, the method further comprises:

and a sixth sending module, configured to send first data to the target node according to the target mapping relationship after determining the target mapping relationship according to the first relay reverse mapping indication information.

The embodiment of the invention also provides a base station, which is a donor base station and comprises: a processor and a transceiver;

the processor is used for determining whether relay reverse mapping is started between the target node and the adjacent node according to the capability information between the target node and the adjacent node;

If yes, transmitting relay reverse mapping enabling information to the target node through the transceiver;

Optionally, the processor is further configured to:

after transmitting the relay reverse mapping enable information to the target node, receiving, by the transceiver, reverse mapping execution acknowledgement information transmitted by the target node.

Optionally, the processor is further configured to:

after sending the relay reverse mapping enabling information to the target node, sending a mapping relation configuration signaling to the target node through the transceiver;

The embodiment of the invention also provides a network node, which is a target node, wherein the target node comprises a relay node or a terminal, and the method comprises the following steps: a processor and a transceiver;

The processor is configured to receive, by the transceiver, relay reverse mapping enabling information sent by a donor base station;

transmitting first relay reverse mapping indication information to an adjacent node of the target node through the transceiver according to the relay reverse mapping enabling information;

Optionally, the processor is specifically configured to:

and according to the relay reverse mapping enabling information, the transceiver is utilized to send first relay reverse mapping indication information to the adjacent node of the target node through an air interface.

Optionally, the processor is further configured to:

after sending first relay reverse mapping indication information to the adjacent node of the target node according to the relay reverse mapping enabling information, receiving preset information through the transceiver;

transmitting the data transmission completion indication information to the neighboring node through the transceiver;

Optionally, the processor is specifically configured to:

transmitting, by the transceiver, the data transmission completion indication information to the neighboring node in an adaptation layer header of a last data packet transmitted to the neighboring node according to the mapping relation before updating; or alternatively

And after the last data packet is sent to the adjacent node according to the mapping relation before updating, sending the data transmission completion indication information to the adjacent node in the form of a control data packet through the transceiver.

Optionally, the processor is further configured to:

after transmitting first relay reverse mapping indication information to a neighboring node of the target node according to the relay reverse mapping enabling information, transmitting reverse mapping execution acknowledgement information to the donor base station through the transceiver under the condition that first data transmitted by the neighboring node according to the first relay reverse mapping indication information is received.

The embodiment of the invention also provides a network node, the network node is an adjacent node, the adjacent node comprises a relay node or a terminal, and the method comprises the following steps: a processor and a transceiver;

The processor is configured to receive, by using the transceiver, first relay reverse mapping indication information sent by a target node;

Optionally, the processor is specifically configured to:

and receiving first relay reverse mapping indication information sent by the target node through an air interface through the transceiver.

Optionally, the processor is specifically configured to:

Optionally, the processor is further configured to:

after determining a target mapping relation according to the first relay reverse mapping indication information, receiving data transmission completion indication information sent by the target node through the transceiver;

and according to the data transmission completion indication, the target mapping relation is not adopted when the transceiver transmits second data to the target node.

Optionally, the processor is specifically configured to:

receiving, by the transceiver, data transmission completion indication information carried by the target node in an adaptation layer header of a last data packet sent to the neighboring node according to the mapping relationship; or alternatively

And receiving, by the transceiver, data transmission completion indication information sent in the form of a control data packet by the target node after the last data packet is sent to the adjacent node according to the mapping relationship.

Optionally, the processor is further configured to:

and after determining a target mapping relation according to the first relay reverse mapping indication information, sending first data to the target node through the transceiver according to the target mapping relation.

The embodiment of the invention also provides communication equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor; the processor executes the program to realize the data transmission method of the donor base station side; or alternatively

The processor realizes the data transmission method of the target node side when executing the program; or alternatively

And the processor realizes the data transmission method of the adjacent node side when executing the program.

The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the steps in the above-mentioned data transmission method of the donor base station side; or alternatively

The program, when executed by the processor, implements the steps in the data transmission method on the target node side; or alternatively

The program, when executed by the processor, implements the steps in the data transmission method on the neighboring node side described above.

The technical scheme of the invention has the following beneficial effects:

in the above scheme, the data transmission method determines whether relay reverse mapping is enabled between the target node and the adjacent node according to capability information between the target node and the adjacent node; if yes, sending relay reverse mapping enabling information to the target node; wherein the capability information comprises uplink and downlink reachability information and/or load information between the target node and a neighboring node; the target node comprises a relay node, and the adjacent node comprises a relay node and/or a terminal; or the target node comprises a terminal, and the adjacent node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

Drawings

FIG. 1 is a schematic diagram of an IAB infrastructure of the prior art;

fig. 2 is a schematic flow chart of a data transmission method according to an embodiment of the invention;

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

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

fig. 5 is a schematic diagram of a specific application flow of a data transmission method according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an adaptation layer protocol packet according to an embodiment of the present invention;

fig. 7 is a schematic diagram of an adaptation layer protocol control packet according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a specific application flow of a data transmission method according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a data transmission device according to an embodiment of the invention;

fig. 10 is a schematic diagram of a data transmission device according to an embodiment of the invention;

fig. 11 is a schematic diagram of a data transmission device according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a base station structure according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a network node structure according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a network node structure according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The invention provides a data transmission method, which is applied to a donor base station, and as shown in fig. 2, aiming at the problem that signaling interaction cannot be performed between relay nodes in the prior art and signaling resource waste is caused, and comprises the following steps:

step 21: determining whether relay reverse mapping is started between a target node and an adjacent node according to capability information between the target node and the adjacent node;

step 22: if yes, sending relay reverse mapping enabling information to the target node;

According to the data transmission method provided by the embodiment of the invention, whether relay reverse mapping is started between the target node and the adjacent node is determined according to the capability information between the target node and the adjacent node; if yes, sending relay reverse mapping enabling information to the target node; wherein the capability information comprises uplink and downlink reachability information and/or load information between the target node and a neighboring node; the target node comprises a relay node, and the adjacent node comprises a relay node and/or a terminal; or the target node comprises a terminal, and the adjacent node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

Further, after sending the relay reverse mapping enabling information to the target node, the method further includes: and receiving reverse mapping execution confirmation information sent by the target node.

This makes the donor base station aware that the target node has relay reverse mapping enabled.

Further, after sending the relay reverse mapping enabling information to the target node, the method further includes: sending a mapping relation configuration signaling to the target node; wherein, the mapping relation corresponding to the mapping relation configuration signaling is different from the mapping relation corresponding to the relay reverse mapping enabling information.

This enables updating the mapping relation for the target node.

The embodiment of the invention also provides a data transmission method, which is applied to a target node, wherein the target node comprises a relay node or a terminal, as shown in fig. 3, and comprises the following steps:

step 31: receiving relay reverse mapping enabling information sent by a donor base station;

step 32: according to the relay reverse mapping enabling information, first relay reverse mapping indication information is sent to the adjacent node of the target node;

wherein the first relay reverse mapping indication information is used for indicating whether a target mapping relation is adopted between a user equipment bearer and a backhaul link when the neighboring node transmits data to the target node (i.e. for indicating whether relay reverse mapping is enabled between the target node and the neighboring node);

The data transmission method provided by the embodiment of the invention is characterized in that relay reverse mapping enabling information sent by a donor base station is received; according to the relay reverse mapping enabling information, first relay reverse mapping indication information is sent to the adjacent node of the target node; the first relay reverse mapping indication information is used for indicating whether a target mapping relation is adopted between a user equipment bearer and a backhaul link or not when the adjacent node transmits data to the target node; the target mapping relation is consistent with the mapping relation adopted by the target node for sending the first relay reverse mapping indication information; in the case that the target node includes a relay node, the neighboring node includes a relay node or a terminal; or in the case that the target node comprises a terminal, the neighboring node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

Specifically, the sending, according to the relay reverse mapping enabling information, first relay reverse mapping indication information to the neighboring node of the target node includes: and when data is sent to the adjacent node of the target node, sending first relay reverse mapping indication information to the adjacent node according to the relay reverse mapping enabling information.

In the embodiment of the present invention, the first relay reverse mapping indication information includes at least 1 bit of content.

The first relay reverse mapping indication information is contained in a protocol packet header of an adaptation layer of the target node.

Specifically, in the adaptation layer protocol data packet sent by the target node to the neighboring node, the protocol packet header is located before the radio link control protocol RLC layer protocol data packet; or the protocol packet header is contained in an adaptation layer protocol control data packet sent by the target node to the adjacent node.

In the embodiment of the present invention, the sending, according to the relay reverse mapping enabling information, first relay reverse mapping indication information to the neighboring node of the target node includes: and according to the relay reverse mapping enabling information, sending first relay reverse mapping indication information to the adjacent node of the target node through an air interface.

Further, after sending the first relay reverse mapping indication information to the neighboring node of the target node according to the relay reverse mapping enabling information, the method further includes: receiving preset information; updating the mapping relation according to the preset information, and obtaining data transmission completion indication information; transmitting the data transmission completion indication information to the adjacent node; the preset information comprises mapping relation configuration signaling sent by the donor base station or second relay reverse mapping indication information sent by the adjacent node; and the mapping relation corresponding to the mapping relation configuration signaling is different from the mapping relation adopted by the target node for sending the first relay reverse mapping indication information.

This enables updating the mapping relation of the target node.

Specifically, the sending the data transmission completion indication information to the neighboring node includes: transmitting the data transmission completion indication information to the adjacent node in an adaptation layer header of a last data packet transmitted to the adjacent node according to the mapping relation before updating; or after the last data packet is sent to the adjacent node according to the mapping relation before updating, the data transmission completion indication information is sent to the adjacent node in the form of a control data packet.

Further, after sending the first relay reverse mapping indication information to the neighboring node of the target node according to the relay reverse mapping enabling information, the method further includes: and transmitting reverse mapping execution confirmation information to the donor base station under the condition that the first data transmitted by the adjacent node according to the first relay reverse mapping indication information is received.

The embodiment of the invention also provides a data transmission method applied to the adjacent node, wherein the adjacent node comprises a relay node or a terminal, as shown in fig. 4, and the method comprises the following steps:

step 41: receiving first relay reverse mapping indication information sent by a target node;

step 42: determining a target mapping relation according to the first relay reverse mapping indication information;

The data transmission method provided by the embodiment of the invention is characterized in that the first relay reverse mapping indication information sent by the target node is received; determining a target mapping relation according to the first relay reverse mapping indication information; the first relay reverse mapping indication information is used for indicating whether a target mapping relation is adopted between a user equipment bearer and a backhaul link or not when the adjacent node transmits data to the target node; the target mapping relation is consistent with the mapping relation adopted by the target node for sending the first relay reverse mapping indication information; in the case that the target node includes a relay node, the neighboring node includes a relay node or a terminal; or in the case that the target node comprises a terminal, the neighboring node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

Specifically, the receiving the first relay reverse mapping indication information sent by the target node includes: and receiving first relay reverse mapping indication information sent by the target node when sending data to the adjacent node.

In the embodiment of the present invention, the receiving the first relay reverse mapping indication information sent by the target node includes: and receiving first relay reverse mapping indication information sent by the target node through an air interface.

Specifically, the determining, according to the first relay reverse mapping indication information, a target mapping relationship includes: acquiring user equipment identification information and a bearing identification in a protocol packet header of a first data packet under the condition that a target mapping relation is adopted between a user equipment bearing and a return link when the first relay reverse mapping indication information indicates that the adjacent node transmits data to the target node; determining a target mapping relation according to the user equipment identification information and the bearing identification; the first data packet includes an adaptation layer protocol data packet or an adaptation layer protocol control data packet sent by the target node to the adjacent node.

Further, after determining the target mapping relationship according to the first relay reverse mapping indication information, the method further includes: receiving data transmission completion indication information sent by the target node; and according to the data transmission completion indication, the target mapping relation is not adopted when the second data is sent to the target node.

Specifically, the receiving the data transmission completion indication information sent by the target node includes: receiving data transmission completion indication information carried by the target node in an adaptation layer header of a last data packet sent to the adjacent node according to the mapping relation; or receiving the data transmission completion indication information sent by the target node in the form of a control data packet after the last data packet is sent to the adjacent node according to the mapping relation.

Further, after determining the target mapping relationship according to the first relay reverse mapping indication information, the method further includes: and sending the first data to the target node according to the target mapping relation.

This enables data transmission between relay nodes, but is not limited to between relay nodes, such as between a relay node and a terminal.

The data transmission method provided by the embodiment of the invention is further described below with reference to three sides of the donor base station, the target node and the adjacent node.

In order to solve the above technical problems, the embodiment of the present invention provides a data transmission method, and in particular relates to a reverse mapping method for a backhaul link of a relay node: by sending the reverse mapping instruction of the relay, the uplink and downlink transmission adopts the same bearer (DRB) to the backhaul relay link (BH RLC channel) to map, so that the reciprocity of a wireless channel is fully utilized, the control plane signaling is replaced by the user plane channel associated signaling (namely, the reverse mapping instruction is transferred by the packet header of the user data packet without sending a special signaling, and the specific implementation mode can be that RBI indication bits are added in the packet header, which is described below), so that the signaling overhead between the donor base station and the relay node or the terminal is reduced, and the mapping change time delay is reduced.

The embodiment of the invention relates to a reverse mapping method of a relay node backhaul link, which can be summarized as follows: a) The donor base station indicates that relay reverse mapping is enabled to the relay node 1 (namely the target node), and the relay node 1 sends a relay reverse mapping indication to the next hop relay node 2 or the terminal 1 (namely the adjacent node) during downlink transmission, the relay node 2 or the terminal 1 receives the relay reverse mapping indication, and the same bearing to backhaul relay link mapping is adopted during uplink transmission as that of downlink transmission from the relay node 1 to the relay node 2 or the terminal 1; b) The donor base station indicates to the relay node 3 or the terminal 2 (i.e. the target node) that the relay reverse mapping is enabled, when in uplink transmission, the relay node 3 or the terminal 2 sends a relay reverse mapping indication to the next hop relay node 4 (i.e. the adjacent node), the relay node 4 receives the relay reverse mapping indication, and when in downlink transmission, the same bearer to backhaul relay link mapping is adopted from the relay node 3 or the terminal 2 to the relay node 4 in uplink transmission.

Specific:

a) The uplink adopts downlink mapping, and can be shown in fig. 5:

step 1a. The donor base station indicates to the relay node 1 to enable relay reverse mapping.

1a.1. The donor base station starts relay reverse mapping according to the up-down link reachability or load between the managed relay node 1 and other relay nodes; it may also be understood that the relay reverse mapping enabling information is sent to the target node for mapping up to the relay node 1.

The description herein is as follows: in the embodiment of the invention, the donor base station knows the reachability and load condition between the subordinate relay nodes, for example, when the uplink and downlink links between the two relay nodes are available and the load is lighter, the same mapping relation between uplink and downlink can be configured.

Step 2a, during downlink transmission, the relay node 1 sends a relay reverse mapping instruction to the next hop relay node 2 or the terminal 1. Specifically, the adaptation layer protocol data packet may be sent.

2a.1. The relay reverse mapping indication (Reflective Backhaul Indicator, RBI) comprises at least 1 bit for indicating whether relay reverse mapping is enabled between relay node 1 and relay node 2 or terminal 1.

2a.2. The relay reverse map indication may be included in a protocol header of an adaptation layer (adaptation layer) of the relay node 1.

2a.2.1. In particular, an adaptation layer protocol packet (adaption layer PDU) is formed by the adaptation layer of the relay node 1 adding a protocol header (header) before a downlink RLC layer protocol packet (RLC PDU) to be transmitted, an example being shown in fig. 6.

2a.2.2. Alternatively, the adaptation layer of the relay node 1 sends an adaptation layer protocol control packet (adaption layer control PDU) with header only, an example is shown in fig. 7.

2a.3. Data packets carrying the relay reverse map indication may be sent over the air interface Uu.

2a.4 when the DRB mapping relation of the relay mapping is changed (re-mapping), determining whether to continue to enable the relay mapping according to new mapping relation configuration signaling from the donor base station; can be used all the time without a termination instruction.

2a.5. Conflict resolution: the relay node 1 always adopts the mapping relation of the latest configuration, namely, if the relay node 1 receives a relay reverse mapping instruction from the relay node 2 or the terminal 1 after executing the operation, the same bearing to backhaul relay link mapping is adopted in downlink transmission as in uplink transmission from the relay node 2 or the terminal 1 to the relay node 1; i.e. the relay node 1 is enabled for uplink reverse mapping, but the relay node 2 or the terminal 1 is also enabled for downlink reverse mapping, in which case the last received mapping relationship is subject to.

That is, the stopping of the mapping relation with respect to the relay node 1 includes both cases of 2a.4 and 2 a.5.

And 3a, receiving the relay reverse mapping instruction by the relay node 2 or the terminal 1, and adopting the same bearing to backhaul relay link mapping as the downlink transmission from the relay node 1 to the relay node 2 or the terminal 1 during uplink transmission.

3a.1. The relay node 2 or the terminal 1 may receive the data packet carrying the relay reverse mapping indication through the air interface Uu.

3a.2. The adaptation layer of the relay node 2 or the terminal 1 reads the received adaptation layer protocol packet header to obtain a relay reverse mapping indication.

3a.2.1. If the relay reverse mapping indication is yes, the relay node 2 or the adaptation layer of the terminal 1 reads the user equipment identification information (UE ID) and the bearer identification (DRB ID) in the received adaptation layer protocol packet header, and obtains the downlink mapping relationship between the user equipment bearer 1 (i.e. the UE DRB determined by the UE ID and the DRB ID together) and the backhaul relay link 1.

3a.3. The adaptation layer of the relay node 2 or the terminal 1 maps the user equipment bearer 1 to the backhaul relay link 1 when transmitting uplink.

3a.3.1. If there was a mapping of user equipment bearer 1 to other backhaul relay links 2 before, the adaptation layer may send a data transmission complete indication over backhaul relay link 2 after mapping user equipment bearer 1 to backhaul relay link 1, which indication may be contained in the adaptation layer header of the last data packet sent over backhaul relay link 2 or in the form of a control data packet (e.g. a null data packet with only adaptation layer header).

I.e. to the relay node connected to the relay node 2 or terminal 1 via the backhaul relay link 2, in order to inform that node that the link has been changed.

This part may also correspond to: the updating of the mapping relation of the relay node 1, namely, after the reverse mapping is started between the relay node 1 and the relay node 2 or the terminal 1, the mapping relation is changed and updated.

Step 4a. After receiving the data packet conforming to the mapping relation described in step 3a from the relay node 2 or the terminal 1, the relay node 1 may feed back a reverse mapping execution acknowledgement to the donor base station.

Wherein, the mapping relation of 3a is met, namely: the same uplink map (map to backhaul relay link 1) as the "bearer to backhaul relay link map that is the same as the relay node 1 to relay node 2 or terminal 1 downlink transmission".

For the above a), it is described that the donor base station configures an uplink map of the relay node 1 (a map of the next-hop relay node 2 or the terminal 1 to the relay node 1) using the same map as the downlink of the relay node 1 (a map of the relay node 1 to the next-hop relay node 2 or the terminal 1).

b) The downlink adopts uplink mapping, and can be shown in fig. 8:

step 1b. The donor base station indicates to the relay node 3 or the terminal 2 to enable relay reverse mapping.

1b.1. The donor base station enables relay reverse mapping according to uplink and downlink reachability or load between the governed relay node 3 or the terminal 2 and other relay nodes.

And 2b, in the uplink transmission, the relay node 3 or the terminal 2 sends a relay reverse mapping instruction to the next hop relay node 4.

The relay reverse mapping indication (Reflective Backhaul Indicator, RBI) comprises at least 1 bit for indicating whether relay reverse mapping is enabled between the relay node 3 or the terminal 2 and the relay node 4.

The relay reverse map indication may be included in a protocol header of an adaptation layer (adaptation layer) of the relay node 3 or the terminal 2.

2b.2.1. Specifically, an adaptation layer protocol packet (adaption layer PDU) is formed by the adaptation layer of the relay node 3 or the terminal 2 adding a protocol header (header) before an uplink RLC layer protocol packet (RLC PDU) to be transmitted, an example is shown in fig. 6.

2b.2.2. Alternatively, the adaptation layer of the relay node 3 or the terminal 2 sends an adaptation layer protocol control packet (adaption layer control PDU) with header only, an example is shown in fig. 7.

2b.3. Data packets carrying the relay reverse map indication may be sent over the air interface Uu.

2b.4. When the DRB mapping relationship where relay mapping is enabled is changed (remapped), it is determined whether relay mapping is continued or not according to new mapping relationship configuration signaling from the donor base station.

2b.5. Conflict resolution: the relay node 3 or the terminal 2 always adopts the mapping relation of the latest configuration, that is, if the relay node 3 or the terminal 2 receives the relay reverse mapping instruction from the relay node 4 after executing the above operation, the same bearer to backhaul relay link mapping is adopted in uplink transmission as in downlink transmission from the relay node 4 to the relay node 3 or the terminal 2.

And 3b, the relay node 4 receives the relay reverse mapping instruction, and adopts the same bearing to backhaul relay link mapping as that of the uplink transmission from the relay node 3 or the terminal 2 to the relay node 4 during downlink transmission.

3b.1. The relay node 4 may receive the data packet carrying the relay reverse mapping indication over the air interface Uu.

3b.2. The adaptation layer of the relay node 4 reads the received adaptation layer protocol packet header to obtain a relay reverse mapping indication.

3b.2.1. If the relay reverse mapping indication is yes, the adaptation layer of the relay node 4 reads the user equipment identification information (UE ID) and the bearer identification (DRB ID) in the received adaptation layer protocol data packet header, and obtains the downlink mapping relationship between the user equipment bearer 2 and the backhaul relay link 3.

3b.3. The adaptation layer of the relay node 4 maps the user equipment bearer 2 to the backhaul relay link 3 during downlink transmission.

3b.3.1. If there was previously a mapping of the user equipment bearer 2 to the other backhaul relay link 4, the adaptation layer may send a data transmission complete indication over the backhaul relay link 4 after mapping the user equipment bearer 2 to the backhaul relay link 3, which indication may be contained in the adaptation layer header of the last data packet sent over the backhaul relay link 4 or in the form of a control data packet (e.g. a null data packet with only the adaptation layer header).

Step 4b, after receiving the data packet which accords with the mapping relation described in step 3b from the relay node 4, the relay node 3 or the terminal 2 can feed back a reverse mapping execution acknowledgement to the donor base station.

For the relevant content, reference may be made to the relevant description in the case of a) above, and the description is omitted here.

In this description, the above can be understood as: a) The uplink and the downlink are mapped in the same way, namely the downlink mapping is configured, and the uplink mapping is required to be consistent. b) The downlink adopts the same mapping as the uplink, namely the uplink mapping is configured, and the downlink mapping is required to be consistent.

In the embodiment of the invention, regarding the reverse mapping relation, each target node and each adjacent node need to be configured independently; for example, enabling reverse mapping between relay node 1 and relay node a does not mean that reverse mapping is also enabled between relay node 1 and relay node B, and needs to be separately configured.

In the embodiment of the present invention, the uplink refers to: subordinate nodes in the architecture send data to the node; the downlink refers to: the subordinate node in the node sending item architecture sends data.

As can be seen from the above, according to the scheme provided by the embodiment of the present invention, the user plane channel associated signaling manner is used to send the reverse mapping indication of the relay between the relay nodes, so that the uplink and downlink transmission adopts the same bearer (DRB) to the backhaul relay link (BH RLC channel) mapping, and the reciprocity of the wireless channel is fully utilized; in addition, in the prior art, the donor base station needs to send mapping configuration signaling to two relay nodes respectively; in the scheme, the donor base station only needs to send the mapping configuration signaling containing the reverse mapping indication to one of the nodes, so that the purposes of reducing signaling overhead between the donor base station and the relay node or the terminal and reducing mapping change time delay are achieved. Specifically, if the scheme (the reverse mapping indication method) is not adopted, the relay node needs to forward the mapping relation configuration signaling to the execution node, but by adopting the scheme, the relay node only needs to change RBI indication bits in any data packet header, so that signaling overhead and mapping change time delay are reduced.

The following describes relay content related to a scheme provided by an embodiment of the present invention:

in a 4G (LTE) Relay network, relay (Relay) is classified according to a policy of Relay as follows:

(1) Type1 (Type 1) -Relay can independently control terminals in a certain small-range area, and has independent cell identification and radio resource management mechanism. From the terminal side, type1Relay is a conventional eNodeB (base station).

(2) Type1a-Relay has most of the characteristics of Type1Relay, but the spectrum used by the access link between its Relay and the terminal and the backhaul link between the eNodeB and the Relay is different.

(3) Type1b-Relay also has most of the characteristics of Type1Relay, but the access link between its Relay and terminal and the backhaul link between eNodeB and Relay use the same spectrum. The Relay can work on two links at the same time without mutual interference through the physical isolation of the access link and the backhaul link.

(4) Type2Relay has functions of an independent physical layer, a MAC (medium access control) layer, an RLC (radio link control protocol) layer, and the like, and has an independent or partial RRC (radio resource control) function. Since the Type2Relay has no own independent cell and no independent PCI (physical cell identity), part of its control function is controlled by the eNodeB, i.e. the Type2Relay only transmits PDSCH (physical downlink shared channel) but does not transmit CRS (cell reference signal) and PDCCH (physical downlink control channel).

It can be seen that since 4G (LTE) networks do not support a CU (centralized unit) and DU (distributed unit) separated architecture, the Relay node is either identical to the presence of a base station (independent cell) or has independent protocol functionality but is still under the control of the base station.

NR (5G) IAB supports a CU and DU separated architecture, so that an IAB node acting as a relay only needs to have a user plane function, forward user data of its child node to its parent node (uplink), or forward user data of its parent node to its child node (downlink), guarantee QoS as much as possible, and implement logical isolation for different UEs (terminals) and even different data bearers of different UEs when necessary.

Therefore, a new adaptation layer (temporary name is adaptation layer) is introduced above the RLC layer of the IAB node, and is responsible for mapping uplink data bearers (DRBs) of UEs and/or sub-nodes accessing the IAB node to a relay RLC channel (BH RLC channel) connected to the parent node, or mapping downlink DRBs of the parent node to a BH RLC channel connected to UEs and/or sub-nodes accessing the IAB node, where data on the same BH RLC channel obtains the same QoS treatment.

The embodiment of the invention also provides a data transmission device, which is applied to the donor base station, as shown in fig. 9, and comprises:

A first determining module 91, configured to determine whether relay reverse mapping is enabled between a target node and a neighboring node according to capability information between the target node and the neighboring node;

a first sending module 92, configured to send relay reverse mapping enabling information to the target node if the relay reverse mapping enabling information is positive;

The data transmission device provided by the embodiment of the invention determines whether relay reverse mapping is started between the target node and the adjacent node according to the capability information between the target node and the adjacent node; if yes, sending relay reverse mapping enabling information to the target node; wherein the capability information comprises uplink and downlink reachability information and/or load information between the target node and a neighboring node; the target node comprises a relay node, and the adjacent node comprises a relay node and/or a terminal; or the target node comprises a terminal, and the adjacent node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

Further, the data transmission device further includes: and the first receiving module is used for receiving reverse mapping execution confirmation information sent by the target node after the relay reverse mapping enabling information is sent to the target node.

Further, the data transmission device further includes: the second sending module is used for sending mapping relation configuration signaling to the target node after sending relay reverse mapping enabling information to the target node; wherein, the mapping relation corresponding to the mapping relation configuration signaling is different from the mapping relation corresponding to the relay reverse mapping enabling information.

The implementation embodiments of the donor base station side are applicable to the embodiments of the data transmission device, and can achieve the corresponding same technical effects.

The embodiment of the invention also provides a data transmission device, which is applied to a target node, wherein the target node comprises a relay node or a terminal, as shown in fig. 10, and comprises:

a second receiving module 101, configured to receive relay reverse mapping enabling information sent by a donor base station;

a third sending module 102, configured to send first relay reverse mapping indication information to a neighboring node of the target node according to the relay reverse mapping enabling information;

The data transmission device provided by the embodiment of the invention receives the relay reverse mapping enabling information sent by the donor base station; according to the relay reverse mapping enabling information, first relay reverse mapping indication information is sent to the adjacent node of the target node; the first relay reverse mapping indication information is used for indicating whether a target mapping relation is adopted between a user equipment bearer and a backhaul link or not when the adjacent node transmits data to the target node; the target mapping relation is consistent with the mapping relation adopted by the target node for sending the first relay reverse mapping indication information; in the case that the target node includes a relay node, the neighboring node includes a relay node or a terminal; or in the case that the target node comprises a terminal, the neighboring node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

In an embodiment of the present invention, the third sending module includes: and the first sending submodule is used for sending first relay reverse mapping indication information to the adjacent node of the target node through an air interface according to the relay reverse mapping enabling information.

Further, the data transmission device further includes: a third receiving module, configured to receive preset information after sending first relay reverse mapping indication information to a neighboring node of the target node according to the relay reverse mapping enabling information; the first processing module is used for updating the mapping relation according to the preset information and obtaining data transmission completion indication information; a fourth sending module, configured to send the data transmission completion indication information to the neighboring node; the preset information comprises mapping relation configuration signaling sent by the donor base station or second relay reverse mapping indication information sent by the adjacent node; and the mapping relation corresponding to the mapping relation configuration signaling is different from the mapping relation adopted by the target node for sending the first relay reverse mapping indication information.

Specifically, the fourth sending module includes: a second sending sub-module, configured to send the data transmission completion indication information to the neighboring node in an adaptation layer header of a last data packet sent to the neighboring node according to the mapping relation before updating; or after the last data packet is sent to the adjacent node according to the mapping relation before updating, the data transmission completion indication information is sent to the adjacent node in the form of a control data packet.

Further, the data transmission device further includes: and a fifth sending module, configured to send reverse mapping execution acknowledgement information to the donor base station when receiving first data sent by the neighboring node according to the first relay reverse mapping indication information after sending the first relay reverse mapping indication information to the neighboring node of the target node according to the relay reverse mapping enabling information.

The implementation embodiments of the target node side are applicable to the embodiments of the data transmission device, and can achieve the corresponding same technical effects.

The embodiment of the invention also provides a data transmission device, which is applied to the adjacent node, wherein the adjacent node comprises a relay node or a terminal, as shown in fig. 11, and comprises:

A fourth receiving module 111, configured to receive the first relay reverse mapping indication information sent by the target node;

a second determining module 112, configured to determine a target mapping relationship according to the first relay reverse mapping indication information;

The data transmission device provided by the embodiment of the invention receives the first relay reverse mapping indication information sent by the target node; determining a target mapping relation according to the first relay reverse mapping indication information; the first relay reverse mapping indication information is used for indicating whether a target mapping relation is adopted between a user equipment bearer and a backhaul link or not when the adjacent node transmits data to the target node; the target mapping relation is consistent with the mapping relation adopted by the target node for sending the first relay reverse mapping indication information; in the case that the target node includes a relay node, the neighboring node includes a relay node or a terminal; or in the case that the target node comprises a terminal, the neighboring node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

In an embodiment of the present invention, the fourth receiving module includes: and the first receiving submodule is used for receiving the first relay reverse mapping indication information sent by the target node through the air interface.

Specifically, the second determining module includes: a first obtaining sub-module, configured to obtain, when the first relay reverse mapping indication information indicates that the neighboring node transmits data to the target node, user equipment identification information and a bearer identification in a protocol packet header of a first data packet in a case that a target mapping relationship is adopted between a user equipment bearer and a backhaul link; a first determining submodule, configured to determine a target mapping relationship according to the user equipment identification information and the bearer identification; the first data packet includes an adaptation layer protocol data packet or an adaptation layer protocol control data packet sent by the target node to the adjacent node.

Further, the data transmission device further includes: a fifth receiving module, configured to receive, after determining a target mapping relationship according to the first relay reverse mapping indication information, data transmission completion indication information sent by the target node; and the second processing module is used for not adopting the target mapping relation when sending second data to the target node according to the data transmission completion indication.

Specifically, the fifth receiving module includes: a second receiving sub-module, configured to receive data transmission completion indication information carried by the target node in an adaptation layer header of a last data packet sent to the adjacent node according to the mapping relationship; or receiving the data transmission completion indication information sent by the target node in the form of a control data packet after the last data packet is sent to the adjacent node according to the mapping relation.

Further, the data transmission device further includes: and a sixth sending module, configured to send first data to the target node according to the target mapping relationship after determining the target mapping relationship according to the first relay reverse mapping indication information.

The implementation embodiments of the adjacent node sides are applicable to the embodiments of the data transmission device, and the corresponding same technical effects can be achieved.

The embodiment of the invention also provides a base station, wherein the base station is a donor base station, as shown in fig. 12, comprising: a processor 121 and a transceiver 122;

the processor 121 is configured to determine whether relay reverse mapping is enabled between a target node and a neighboring node according to capability information between the target node and the neighboring node;

if yes, transmitting relay reverse mapping enabling information to the target node through the transceiver 122;

The base station provided by the embodiment of the invention determines whether relay reverse mapping is started between the target node and the adjacent node according to the capability information between the target node and the adjacent node; if yes, sending relay reverse mapping enabling information to the target node; wherein the capability information comprises uplink and downlink reachability information and/or load information between the target node and a neighboring node; the target node comprises a relay node, and the adjacent node comprises a relay node and/or a terminal; or the target node comprises a terminal, and the adjacent node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

Further, the processor is further configured to: after transmitting the relay reverse mapping enable information to the target node, receiving, by the transceiver, reverse mapping execution acknowledgement information transmitted by the target node.

Still further, the processor is further configured to: after sending the relay reverse mapping enabling information to the target node, sending a mapping relation configuration signaling to the target node through the transceiver; wherein, the mapping relation corresponding to the mapping relation configuration signaling is different from the mapping relation corresponding to the relay reverse mapping enabling information.

The implementation embodiments of the donor base station side are applicable to the base station embodiments, and the corresponding same technical effects can be achieved.

The embodiment of the invention also provides a network node, which is a target node, wherein the target node comprises a relay node or a terminal, as shown in fig. 13, and comprises: a processor 131 and a transceiver 132;

the processor 131 is configured to receive, through the transceiver 132, relay reverse mapping enabling information sent by a donor base station;

transmitting, by the transceiver 132, first relay reverse mapping indication information to a neighboring node of the target node according to the relay reverse mapping enable information;

The network node provided by the embodiment of the invention receives the relay reverse mapping enabling information sent by the donor base station; according to the relay reverse mapping enabling information, first relay reverse mapping indication information is sent to the adjacent node of the target node; the first relay reverse mapping indication information is used for indicating whether a target mapping relation is adopted between a user equipment bearer and a backhaul link or not when the adjacent node transmits data to the target node; the target mapping relation is consistent with the mapping relation adopted by the target node for sending the first relay reverse mapping indication information; in the case that the target node includes a relay node, the neighboring node includes a relay node or a terminal; or in the case that the target node comprises a terminal, the neighboring node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

In an embodiment of the present invention, the processor is specifically configured to: and according to the relay reverse mapping enabling information, the transceiver is utilized to send first relay reverse mapping indication information to the adjacent node of the target node through an air interface.

Further, the processor is further configured to: after sending first relay reverse mapping indication information to the adjacent node of the target node according to the relay reverse mapping enabling information, receiving preset information through the transceiver; updating the mapping relation according to the preset information, and obtaining data transmission completion indication information; transmitting the data transmission completion indication information to the neighboring node through the transceiver; the preset information comprises mapping relation configuration signaling sent by the donor base station or second relay reverse mapping indication information sent by the adjacent node; and the mapping relation corresponding to the mapping relation configuration signaling is different from the mapping relation adopted by the target node for sending the first relay reverse mapping indication information.

Specifically, the processor is specifically configured to: transmitting, by the transceiver, the data transmission completion indication information to the neighboring node in an adaptation layer header of a last data packet transmitted to the neighboring node according to the mapping relation before updating; or after the last data packet is sent to the adjacent node according to the mapping relation before updating, the transceiver is used for sending the data transmission completion indication information to the adjacent node in the form of a control data packet.

Further, the processor is further configured to: after transmitting first relay reverse mapping indication information to a neighboring node of the target node according to the relay reverse mapping enabling information, transmitting reverse mapping execution acknowledgement information to the donor base station through the transceiver under the condition that first data transmitted by the neighboring node according to the first relay reverse mapping indication information is received.

The implementation embodiments of the target node side are applicable to the embodiments of the network node, and the corresponding same technical effects can be achieved.

The embodiment of the invention also provides a network node, which is an adjacent node, wherein the adjacent node comprises a relay node or a terminal, as shown in fig. 14, and comprises: a processor 141 and a transceiver 142;

The processor 141 is configured to receive, by the transceiver 142, first relay reverse mapping indication information sent by a target node;

The network node provided by the embodiment of the invention receives the first relay reverse mapping indication information sent by the target node; determining a target mapping relation according to the first relay reverse mapping indication information; the first relay reverse mapping indication information is used for indicating whether a target mapping relation is adopted between a user equipment bearer and a backhaul link or not when the adjacent node transmits data to the target node; the target mapping relation is consistent with the mapping relation adopted by the target node for sending the first relay reverse mapping indication information; in the case that the target node includes a relay node, the neighboring node includes a relay node or a terminal; or in the case that the target node comprises a terminal, the neighboring node comprises a relay node; the signaling interaction between relay nodes can be supported and realized, and uplink and downlink transmission adopts the same bearer (DRB) to carry out the mapping of a backhaul relay link (BH RLC channel), so that the reciprocity of a wireless channel is fully utilized; the user plane associated signaling replaces control plane signaling, so that signaling overhead between the donor base station and the relay node or the terminal is reduced, and mapping change time delay is reduced; the method and the device well solve the problem that signaling resource waste is caused by incapability of performing signaling interaction between relay nodes in the prior art.

In an embodiment of the present invention, the processor is specifically configured to: and receiving first relay reverse mapping indication information sent by the target node through an air interface through the transceiver.

Specifically, the processor is specifically configured to: acquiring user equipment identification information and a bearing identification in a protocol packet header of a first data packet under the condition that a target mapping relation is adopted between a user equipment bearing and a return link when the first relay reverse mapping indication information indicates that the adjacent node transmits data to the target node; determining a target mapping relation according to the user equipment identification information and the bearing identification; the first data packet includes an adaptation layer protocol data packet or an adaptation layer protocol control data packet sent by the target node to the adjacent node.

Further, the processor is further configured to: after determining a target mapping relation according to the first relay reverse mapping indication information, receiving data transmission completion indication information sent by the target node through the transceiver; and according to the data transmission completion indication, the target mapping relation is not adopted when the transceiver transmits second data to the target node.

Specifically, the processor is specifically configured to: receiving, by the transceiver, data transmission completion indication information carried by the target node in an adaptation layer header of a last data packet sent to the neighboring node according to the mapping relationship; or receiving, by the transceiver, data transmission completion indication information sent by the target node in the form of a control data packet after the last data packet is sent to the adjacent node according to the mapping relation.

Further, the processor is further configured to: and after determining a target mapping relation according to the first relay reverse mapping indication information, sending first data to the target node through the transceiver according to the target mapping relation.

The implementation embodiments of the adjacent node side are applicable to the embodiments of the network node, and the corresponding same technical effects can be achieved.

The implementation embodiments of the donor base station side, the target node side or the adjacent node side are all applicable to the embodiments of the communication device, and the corresponding same technical effects can be achieved.

The implementation embodiments of the donor base station side, the target node side or the adjacent node side are all applicable to the embodiments of the computer readable storage medium, and the corresponding same technical effects can be achieved.

It should be noted that many of the functional components described in this specification are referred to as modules/sub-modules in order to more particularly emphasize their implementation independence.

In embodiments of the invention, the modules/sub-modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be organized as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices.

Where a module may be implemented in software, taking into account the level of existing hardware technology, a module may be implemented in software, and one skilled in the art may, without regard to cost, build corresponding hardware circuitry, including conventional Very Large Scale Integration (VLSI) circuits or gate arrays, and existing semiconductors such as logic chips, transistors, or other discrete components, to achieve the corresponding functions. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the principles of the present invention, and such modifications and changes should also be considered as being within the scope of the present invention.

Claims

1. A data transmission method applied to a donor base station, comprising:

if yes, sending relay reverse mapping enabling information to the target node;

2. The data transmission method according to claim 1, further comprising, after transmitting relay reverse map enable information to the target node:

3. The data transmission method according to claim 1, further comprising, after transmitting relay reverse map enable information to the target node:

sending a mapping relation configuration signaling to the target node;

4. The data transmission method is applied to a target node, wherein the target node comprises a relay node or a terminal, and is characterized by comprising the following steps:

5. The data transmission method according to claim 4, wherein the first relay reverse map indication information includes at least 1 bit of content.

6. The data transmission method according to claim 4, wherein the first relay reverse map indication information is included in a protocol header of an adaptation layer of the target node.

7. The data transmission method according to claim 6, wherein in the adaptation layer protocol data packet sent by the target node to the neighboring node, the protocol packet header is located before a radio link control protocol RLC layer protocol data packet; or alternatively

8. The method according to claim 4, wherein the sending the first relay reverse mapping indication information to the neighboring node of the target node according to the relay reverse mapping enable information includes:

9. The data transmission method according to claim 4, further comprising, after transmitting first relay reverse map indication information to a neighboring node of the target node according to the relay reverse map enable information:

receiving preset information;

10. The data transmission method according to claim 9, wherein the transmitting the data transmission completion indication information to the neighboring node includes:

11. The data transmission method according to claim 4, further comprising, after transmitting first relay reverse map indication information to a neighboring node of the target node according to the relay reverse map enable information:

12. A data transmission method applied to a neighboring node, wherein the neighboring node comprises a relay node or a terminal, the method comprising:

13. The data transmission method according to claim 12, wherein the first relay reverse map indication information includes at least 1 bit of content.

14. The data transmission method according to claim 12, wherein the first relay reverse map indication information is included in a protocol header of an adaptation layer of the target node.

15. The data transmission method according to claim 14, wherein in the adaptation layer protocol data packet sent by the target node to the neighboring node, the protocol packet header is located before a radio link control protocol RLC layer protocol data packet; or alternatively

16. The method for transmitting data according to claim 12, wherein receiving the first relay reverse map indication information sent by the target node includes:

17. The method according to claim 12, 14 or 15, wherein determining the target mapping relationship according to the first relay reverse mapping indication information includes:

18. The data transmission method according to claim 12, further comprising, after determining a target mapping relationship according to the first relay reverse mapping indication information:

19. The method for data transmission according to claim 18, wherein said receiving the data transmission completion indication information sent by the target node includes:

And receiving data transmission completion indication information sent by the target node in the form of a control data packet after the last data packet is sent to the adjacent node according to the mapping relation.

20. The data transmission method according to claim 12, further comprising, after determining a target mapping relationship according to the first relay reverse mapping indication information:

21. A data transmission apparatus for use in a donor base station, comprising:

22. A data transmission apparatus applied to a target node, the target node comprising a relay node or a terminal, comprising:

23. A data transmission apparatus applied to a neighboring node, the neighboring node including a relay node or a terminal, comprising:

24. A base station, the base station being a donor base station, comprising: a processor and a transceiver;

25. A network node, the network node being a target node, the target node comprising a relay node or a terminal, comprising: a processor and a transceiver;

26. A network node, the network node being a neighboring node, the neighboring node comprising a relay node or a terminal, comprising: a processor and a transceiver;

27. A communication device comprising a memory, a processor and a computer program stored on the memory and executable on the processor; -wherein the processor, when executing the program, implements a data transmission method as claimed in any one of claims 1 to 3; or alternatively

The processor implementing the data transmission method according to any one of claims 4 to 11 when executing the program; or alternatively

The processor, when executing the program, implements the data transmission method according to any one of claims 12 to 20.

28. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps in the data transmission method according to any one of claims 1 to 3; or alternatively

The program, when executed by a processor, implementing the steps in the data transmission method as claimed in any one of claims 4 to 11; or alternatively

The program, when executed by a processor, implements the steps of the data transmission method of any of claims 12 to 20.