CN113922930A

CN113922930A - Data transmission method and equipment

Info

Publication number: CN113922930A
Application number: CN202010657717.9A
Authority: CN
Inventors: 孙军帅; 刘光毅
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2022-01-11

Abstract

A data transmission method and device, the method includes: a first MAC entity of a first communication device acquires a first parameter of data transmission of a hybrid automatic repeat request (HARQ) functional unit established for a second communication device, wherein the HARQ functional unit comprises an HARQ entity and/or an HARQ process; the first MAC entity sends adjustment information of a first link to an upper layer according to the first parameter sent by the data, where the first link is a link between a MAC layer and a lower layer to which a related HARQ functional unit belongs, and the related HARQ functional unit includes: the source HARQ functional unit before adjustment and/or the destination HARQ functional unit after adjustment. The embodiment of the invention can decide whether to adjust the link or not according to the data sending condition by the MAC layer, can improve the flexible control capability of the MAC layer, can also reduce the time delay of data packet receiving confirmation, and reduces the cost required by transmitting and sending the state packet between the first communication equipment and the second communication equipment.

Description

Data transmission method and equipment

Technical Field

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

Background

Currently, a five-generation mobile communication (5G) wireless Access layer (AS) Protocol stack still adopts an Automatic Repeat reQuest (ARQ) and a Hybrid Automatic Repeat reQuest (HARQ) two-layer Packet retransmission mechanism, and defines layer 2(L2) including a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (Packet Data Convergence Protocol, PDCP) layer, a Radio Link Control (Radio Link Control, RLC) layer and a Medium Access Control (MAC) layer. Where ARQ is at the RLC layer and HARQ is at the MAC layer.

And according to the protocol specification, the HARQ entity controls the success or failure of data transmission on the air interface. If the data is still not successfully transmitted when the maximum number of times of transmission by the HARQ entity is reached, the HARQ entity will reset the HARQ process, i.e. it is equivalent to discard the data packet. The HARQ entity does not typically report information of the dropped packet to an upper layer. The upper layer is only processed by a fault-tolerant mechanism specified by a Protocol, for example, an Automatic Repeat reQuest (ARQ) Protocol determines according to a status packet transmitted by an ARQ of an opposite end, and a Transmission Control Protocol (TCP) layer determines according to a status packet transmitted by a TCP layer of an opposite end. The above ARQ does not fully utilize the flexible control capability of the MAC layer by receiving the status packet sent by the peer RLC to obtain the data transmission failure information (NACK information), and brings the overhead of sending the status packet and the time delay caused by the acknowledgement through the status packet.

The design goal of the to the simple Network (Lite Network) facing next generation mobile communications requires this approach to redesign.

Disclosure of Invention

At least one embodiment of the present invention provides a data transmission method and device, and provides a scheme for triggering link adjustment by an MAC layer according to a data transmission condition, so as to improve flexible control capability of the MAC layer.

According to an aspect of the present invention, at least one embodiment provides a data transmission method, including:

a first MAC entity of a first communication device acquires a first parameter of data transmission of a hybrid automatic repeat request (HARQ) functional unit established for a second communication device, wherein the HARQ functional unit comprises an HARQ entity and/or an HARQ process;

the first MAC entity sends adjustment information of a first link to an upper layer according to the first parameter sent by the data, where the first link is a link between a MAC layer and a lower layer to which a related HARQ functional unit belongs, and the related HARQ functional unit includes: the source HARQ functional unit before adjustment and/or the destination HARQ functional unit after adjustment.

Further, according to at least one embodiment of the present invention, before transmitting the adjustment information of the first link, the method further includes:

the first MAC entity determines the link quality of a first link corresponding to the HARQ functional unit according to the acquired first parameter of the data sent by the HARQ functional unit;

and determining a source HARQ functional unit needing to be adjusted and/or an adjusted target HARQ functional unit according to the link quality of the first link corresponding to the HARQ functional unit.

Further, in accordance with at least one embodiment of the present invention, the first parameter includes at least one of the following parameters:

the method comprises the steps of data packet size, block error rate (BLER), residual BLER, the number of times each data packet needs to be transmitted when being transmitted successfully, code rate when the data packet is transmitted, SNR or SINR when the data packet is transmitted, the position of a wireless resource block used when each data packet is transmitted in the whole system bandwidth and the size of the wireless resource block, power when the data packet is transmitted, scheduling times in unit time and the size of the transmitted data packet, the ratio of receiving errors of a Physical Downlink Control Channel (PDCCH), the ratio of receiving errors of Downlink Control Information (DCI) carried by the PDCCH, and data packet transmission delay, wherein the data packet transmission delay is the delay of successful transmission at one time and/or the delay of successful retransmission transmission at multiple times.

Further, in accordance with at least one embodiment of the present invention, the method further comprises:

the first MAC entity sends data indication information to an upper layer according to the first parameter for data sending, where the data indication information includes: indication information of retransmission data needing to be retransmitted and/or indication information of successful data sending; the data indication information is sent to a data processing entity, and the data processing entity is arranged on a layer 2 or a layer 3;

and/or the presence of a gas in the gas,

and sending the adjustment information of the first link to a control plane function entity of the first communication device, where the control plane function entity is disposed in layer 3.

the target HARQ functional unit is an HARQ functional unit of a first MAC entity;

and the control plane functional entity of layer 3 of the first communication device generates and sends a signaling message for adjusting the target HARQ functional unit and a corresponding transmission link according to the adjustment information of the first link, where the transmission link includes the first link.

Further, according to at least one embodiment of the present invention, the destination HARQ functional unit is a HARQ functional unit of a second MAC entity;

the method further comprises the following steps:

the first MAC entity sends adjustment information of a second link to a control plane function entity of a layer 3, wherein the second link is a link between a related HARQ function unit and a data processing entity of an upper layer;

and the control plane functional entity of layer 3 of the first communication device generates and sends a signaling message for adjusting the target HARQ functional unit and a corresponding transmission link according to the adjustment information of the first link and the adjustment information of the second link, where the transmission link includes the first link and the second link.

Furthermore, according to at least one embodiment of the present invention, the step of generating and transmitting a signaling message for establishing the target HARQ functional unit and the corresponding link includes:

when the first communication device is a network side device and the second communication device is a terminal, layer 3 of the first communication device initiates a link establishment or reconfiguration process of the target HARQ functional unit and the corresponding transmission link, and sends a link establishment or reconfiguration control signaling for the target HARQ functional unit and the corresponding transmission link to the terminal;

when the first communication device is a terminal and the second communication device is a network side device, layer 3 of the first communication device sends a link establishment or reconfiguration request signaling for requesting the target HARQ functional unit and the corresponding transmission link to the network side device, and establishes or reconfigures the target HARQ functional unit and the corresponding transmission link according to a link establishment or reconfiguration control signaling returned by the network side device.

Furthermore, according to at least one embodiment of the present invention, after the target HARQ functional unit and the corresponding transmission link are established or reconfigured, the method further includes:

and the data processing entity determines data to be sent according to the data indication information, and sends the data to be sent to the target HARQ functional unit for sending, wherein the data to be sent comprises newly transmitted data and/or retransmitted data.

Furthermore, according to at least one embodiment of the present invention, when the destination HARQ functional unit is a HARQ functional unit of a second MAC entity, and an interworking interface exists between the first MAC entity and the second MAC entity, the method further includes:

after the target HARQ functional unit and the corresponding transmission link are established or reconfigured, the first MAC entity sends the residual data to the second MAC entity through the interactive interface, wherein the residual data comprises newly transmitted data which are not sent in a cache and data which need to be retransmitted; and the second MAC entity transmits the residual data through the target HARQ functional unit.

Furthermore, according to at least one embodiment of the present invention, when the destination HARQ functional unit is a HARQ functional unit of a second MAC entity, and there is no interworking interface between the first MAC entity and the second MAC entity, the method further includes:

and the data processing entity determines data to be sent according to the data indication information and sends the data to the target HARQ functional unit for sending.

Furthermore, according to at least one embodiment of the present invention, in case that the destination HARQ functional unit is not found, the method further includes:

and the first MAC entity sends, to the layer 3, a request message for requesting that the data packet of the source HARQ functional unit be sent on another cell, another frequency point, or another beam, where the another cell, another frequency point, or another beam is a cell, a frequency point, or a beam other than the cell, frequency point, or beam corresponding to the source HARQ functional unit.

Furthermore, according to at least one embodiment of the present invention, the step of determining, according to the link quality of the first link corresponding to the HARQ functional unit, a source HARQ functional unit that needs to be adjusted and/or an adjusted destination HARQ functional unit includes:

the first MAC entity records ID, index information or other identity information borne by an upper layer corresponding to each MAC SDU in each data packet, obtains data service quality requirements or service quality requirements borne by the upper layer according to the ID, index information or other identity information borne by the upper layer, and sets first link adjustment conditions corresponding to the HARQ functional unit;

and the first MAC entity determines a source HARQ functional unit needing to be adjusted and/or an adjusted target HARQ functional unit according to the link quality of a first link corresponding to the HARQ functional unit and a first link adjustment condition corresponding to the HARQ functional unit.

Further, according to at least one embodiment of the present invention, after transmitting the adjustment information and the data indication information of the first link, the method further includes:

after receiving the adjustment information and the data indication information of the first link received by the data processing entity, the first MAC entity resets the HARQ process state corresponding to the source HARQ functional unit, and discards data that has not been sent by the source HARQ functional unit.

and the first MAC entity determines retransmission data needing to be retransmitted according to the data receiving feedback information of the second communication equipment received by the source HARQ functional unit, and generates the data indication information.

and the first MAC entity sends a data release message to the data processing entity, wherein the data release message carries information of an upper layer data packet corresponding to the data packet which is successfully sent by the source HARQ functional unit.

Furthermore, according to at least one embodiment of the present invention, the source HARQ functional unit and the destination HARQ functional unit are HARQ functional units of the same MAC entity or different MAC entities.

Furthermore, according to at least one embodiment of the present invention, when the HARQ functional unit is an HARQ process, the number of source HARQ processes for transmitting data before the adjustment is different from the number of destination HARQ processes for transmitting the data after the adjustment.

Furthermore, according to at least one embodiment of the present invention, the source HARQ functional unit and the destination HARQ functional unit are HARQ functional units of the same MAC entity, and the source HARQ functional unit and the destination HARQ functional unit respectively correspond to different bandwidth portions BWP.

According to another aspect of the present invention, at least one embodiment provides a first communication device comprising: a first MAC entity; wherein the content of the first and second substances,

the first MAC entity is used for acquiring a first parameter of data transmission of a hybrid automatic repeat request (HARQ) functional unit established for second communication equipment, wherein the HARQ functional unit comprises an HARQ entity and/or an HARQ process; and sending adjustment information of a first link to an upper layer according to the first parameter sent by the data, wherein the first link is a link between a MAC layer and a lower layer to which a related HARQ functional unit belongs, and the related HARQ functional unit comprises: the source HARQ functional unit before adjustment and/or the destination HARQ functional unit after adjustment.

In addition, according to at least one embodiment of the present invention, the first MAC entity is further configured to determine, according to the acquired first parameter of the transmission data of the HARQ functional unit, link quality of a first link corresponding to the HARQ functional unit; and determining a source HARQ functional unit needing to be adjusted and/or an adjusted target HARQ functional unit according to the link quality of the first link corresponding to the HARQ functional unit.

Further, according to at least one embodiment of the present invention, the first communication device further includes:

a data processing entity arranged at layer 2 or layer 3, and a control plane function entity arranged at layer 3;

the first MAC entity is further configured to:

according to the first parameter of the data transmission, transmitting data indication information to an upper layer, wherein the data indication information comprises: indication information of retransmission data needing to be retransmitted and/or indication information of successful data sending; wherein the data indication information is sent to a data processing entity,

and/or sending the adjustment information of the first link to a control plane function entity of the first communication device.

Further, according to at least one embodiment of the present invention, the destination HARQ functional unit is a HARQ functional unit of a first MAC entity;

and the control plane function entity of layer 3 of the first communication device is configured to generate and send a signaling message for adjusting the target HARQ function unit and a corresponding transmission link according to the adjustment information of the first link, where the transmission link includes the first link.

the first MAC entity is further configured to send adjustment information of a second link to a control plane function entity of layer 3, where the second link is a link between a relevant HARQ function unit and an upper layer data processing entity;

and the control plane function entity of layer 3 of the first communication device is configured to generate and send a signaling message for adjusting the target HARQ function unit and a corresponding transmission link according to the adjustment information of the first link and the adjustment information of the second link, where the transmission link includes the first link and the second link.

In addition, in accordance with at least one embodiment of the present invention,

a layer 3 control plane functional entity of the first communication device, further configured to:

when the first communication device is a network side device and the second communication device is a terminal, initiating a link establishment or reconfiguration process of the target HARQ functional unit and the corresponding transmission link, and sending a link establishment or reconfiguration control signaling for the target HARQ functional unit and the corresponding transmission link to the terminal;

and when the first communication device is a terminal and the second communication device is a network side device, sending a link establishment or reconfiguration request signaling for requesting the target HARQ functional unit and the corresponding transmission link to the network side device, and establishing or reconfiguring the target HARQ functional unit and the corresponding transmission link according to a link establishment or reconfiguration control signaling returned by the network side device.

In addition, according to at least one embodiment of the present invention, the data processing entity is further configured to determine, according to the data indication information, data to be sent after the target HARQ functional unit and the corresponding transmission link are established or reconfigured, and send the data to be sent to the target HARQ functional unit for sending, where the data to be sent includes newly transmitted data and/or retransmitted data.

a second MAC entity;

the target HARQ functional unit is the HARQ functional unit of the second MAC entity, and an interactive interface exists between the first MAC entity and the second MAC entity;

the first MAC entity is further configured to send, through the interactive interface, remaining data to the second MAC entity after the target HARQ functional unit and the corresponding transmission link are established or reconfigured, where the remaining data includes newly transmitted data that has not been sent in a cache and data that needs to be retransmitted; and the second MAC entity transmits the residual data through the target HARQ functional unit.

a second MAC entity;

the target HARQ functional unit is an HARQ functional unit of a second MAC entity, and an interactive interface does not exist between the first MAC entity and the second MAC entity;

and the data processing entity is further configured to determine data to be sent according to the data indication information, and send the data to the target HARQ functional unit for sending.

In addition, according to at least one embodiment of the present invention, the first MAC entity is further configured to send, to the layer 3, a request message for requesting to send a data packet of the source HARQ functional unit on another cell, another frequency point, or another beam when the destination HARQ functional unit is not found, where the another cell, another frequency point, or another beam is a cell, a frequency point, or a beam other than the cell, the frequency point, or the beam corresponding to the source HARQ functional unit.

In addition, according to at least one embodiment of the present invention, the first MAC entity is further configured to record an ID, index information, or other identity information carried by an upper layer corresponding to each MAC SDU in each data packet, obtain a data qos requirement or a service qos requirement carried by the upper layer according to the ID, index information, or other identity information carried by the upper layer, and set a first link adjustment condition corresponding to the HARQ functional unit; and determining a source HARQ functional unit needing to be adjusted and/or an adjusted target HARQ functional unit according to the link quality of the first link corresponding to the HARQ functional unit and the first link adjustment condition corresponding to the HARQ functional unit.

In accordance with another aspect of the present invention, at least one embodiment provides a first communication device comprising a transceiver and a processor, wherein,

the processor is configured to acquire a first parameter for data transmission of a hybrid automatic repeat request HARQ functional unit created for a second communication device, where the HARQ functional unit includes an HARQ entity and/or an HARQ process; according to the first parameter of the data transmission, transmitting adjustment information of a first link to an upper layer, wherein the first link is a link between an MAC layer and a lower layer to which a related HARQ functional unit belongs, and the related HARQ functional unit comprises: the source HARQ functional unit before adjustment and/or the destination HARQ functional unit after adjustment.

According to another aspect of the present invention, at least one embodiment provides a first communication device comprising: a processor, a memory and a program stored on the memory and executable on the processor, which program, when executed by the processor, carries out the steps of the data transmission method as described above.

According to another aspect of the invention, at least one embodiment provides a computer readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of the method as described above.

Compared with the prior art, the data transmission method and the data transmission equipment provided by the embodiment of the invention have the advantages that the MAC layer decides whether link adjustment is needed or not according to the data sending condition, so that the flexible control capability of the MAC layer is improved. In addition, the embodiment of the invention can also discover possible faults in the link earlier and adjust the faults in time, can reduce the time delay of data packet receiving confirmation, and reduces the overhead required by transmitting and sending the state packet between the first communication equipment and the second communication equipment.

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 view of an application scenario according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a protocol stack of a first/second communication device according to an embodiment of the present invention;

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

fig. 4 is a schematic structural diagram of an MAC layer of the first/second communication device according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first communication device according to an embodiment of the present invention;

fig. 6 is another schematic structural diagram of the first communication device according to the embodiment of the present invention.

Detailed Description

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

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

The techniques described herein are not limited to NR systems and Long Time Evolution (LTE)/LTE Evolution (LTE-a) systems, and may also be used for various wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (Wideband Code Division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 802.21(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation Partnership Project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes the NR system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications.

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

Referring to fig. 1, fig. 1 is a block diagram of a wireless communication system to which an embodiment of the present invention is applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may also be referred to as a User terminal or a User Equipment (UE), where the terminal 11 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device, and the specific type of the terminal 11 is not limited in the embodiment of the present invention. The network device 12 may be a Base Station and/or a core network element, wherein the Base Station may be a 5G or later-version Base Station (e.g., a gNB, a 5G NRNB, etc.), or a Base Station in other communication systems (e.g., an eNB, a WLAN access point, or other access points, etc.), wherein the Base Station may be referred to as a node B, an evolved node B, an access point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, it should be noted that, in the embodiment of the present invention only takes the Base Station in the NR system as an example, but does not limit the specific type of base station.

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

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

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

Referring to fig. 2, a protocol stack structure of a first communication device/a second communication device according to an embodiment of the present invention is shown, in which a data processing entity is disposed in Layer 2(Layer 2) of the first communication device/the second communication device in the embodiment of the present invention, and one data processing entity may send data through a plurality of HARQ entities in a MAC Layer. It should be noted that the same device may be used as the first communication device to send data to the peer device, and may also be used as the second communication device to receive data sent by the peer device. In addition, the data processing entity may also be provided at layer 3 of the first communication device/the second communication device.

Referring to fig. 3, a data transmission method provided in an embodiment of the present invention is applied to a first communication device, where the first communication device may specifically be a network side device, such as a base station, and may also be a terminal. As shown in fig. 3, the method includes:

step 31, the first MAC entity of the first communication device obtains a first parameter for data transmission of the HARQ functional unit created for the second communication device.

Here, the first communication device is an originating device for data transmission, and the second communication device is a receiving device for receiving data. The HARQ functional unit comprises a HARQ entity and/or a HARQ process. The HARQ functional unit is disposed in the first communication device layer 2. The first communication device may create one or more HARQ functional units for the same second communication device. One HARQ entity generally corresponds to one second communication device, and at least one HARQ process may be included in one HARQ entity, and the HARQ processes are all used for transmitting data to the second communication device corresponding to the HARQ entity. The first MAC entity may obtain a first parameter of data transmission of the HARQ functional unit in the MAC entity, for example, receive the first parameter of data transmission of the HARQ functional unit in the MAC entity. In addition, the first MAC entity may also obtain a first parameter of data transmission of the HARQ functional unit in the other MAC entity, for example, receive the first parameter of data transmission of the HARQ functional unit in the other MAC entity through an interface between the MAC entities.

In addition, the second communication device may specifically be a network side device or a terminal, for example, when the first communication device is a network side device, the second communication device is usually a terminal; when the first communication device is a terminal, the second communication device is usually a network side device or other terminal device.

In this embodiment of the present invention, the first parameter may specifically include at least one of the following parameters:

packet size, Block Error Rate (BLER), residual BLER, the number of times each packet needs to be transmitted when it is successfully transmitted, the code Rate when transmitting the packet, the Signal-to-Noise Ratio (SNR) or the Signal-to-Interference-plus-Noise Ratio (SINR) when transmitting the packet, the position of the radio resource Block in the entire system bandwidth and the size of the radio resource Block used when transmitting each packet, the power when transmitting the packet, the number of scheduling times per unit time (e.g., one second) and the size of the transmission packet, the Ratio of Physical Downlink Control Channel (PDCCH) reception errors, the Ratio of Downlink Control Information (DCI) reception errors carried by the PDCCH, and the packet transmission delay, and the data packet transmission delay is the delay of successful one-time transmission and/or the delay of successful repeated retransmission transmission.

Step 32, the first MAC entity sends adjustment information of a first link to an upper layer according to the first parameter sent by the data, where the first link is a link between a MAC layer to which a related HARQ functional unit belongs and a lower layer, and the related HARQ functional unit includes: the source HARQ functional unit before adjustment and/or the destination HARQ functional unit after adjustment.

Here, the first MAC entity may determine whether to perform adjustment of the first link according to the first parameter of the data transmission, for example, when the first parameter of the data transmission of a certain HARQ functional unit (for convenience of description, referred to as a source HARQ functional unit) does not meet a preset requirement, the first MAC entity may decide to adjust transmission of related data to another HARQ functional unit (for convenience of description, referred to as a destination HARQ functional unit), and at this time, it needs to adjust a link between a MAC layer to which the related HARQ functional unit belongs and a lower layer (the lower layer may specifically be a physical layer), so that the first MAC entity transmits adjustment information of the first link to the upper layer. The adjustment information of the first link may include contents such as the source HARQ functional unit before adjustment and/or the indication information of the destination HARQ functional unit after adjustment. The adjustment information of the first link is sent to the upper layer, and specifically, may be sent to layer 3 above the MAC layer.

In the embodiment of the present invention, the source HARQ functional unit and the destination HARQ functional unit may be HARQ functional units of the same MAC entity or different MAC entities. When the source HARQ functional unit and the destination HARQ functional unit are HARQ functional units of the same MAC entity, the source HARQ functional unit and the destination HARQ functional unit may correspond to different bandwidth parts (BWPs), respectively.

In addition, when the HARQ functional unit is an HARQ process, the number of source HARQ processes for transmitting data before adjustment may be different from the number of destination HARQ processes for transmitting the data after adjustment.

Through the steps, the embodiment of the invention can decide whether to adjust the link or not according to the data sending condition by the MAC layer, thereby improving the flexible control capability of the MAC layer. Compared with the scheme that the data transmission failure information is obtained by receiving the state packet transmitted by the RLC of the opposite terminal in the prior art, the method and the device for sending the state packet can detect the possible faults in the link earlier and adjust the faults in time, can reduce the time delay of data packet receiving confirmation, and reduce the overhead required by transmitting and sending the state packet between the first communication device and the second communication device.

According to at least one embodiment of the present invention, before sending the adjustment information of the first link in step 32, the first MAC entity may further determine, according to the obtained first parameter of the transmission data of the HARQ functional unit, the link quality of the first link corresponding to the HARQ functional unit. For example, according to the obtained data transmission rate in the unit Time (i.e. the rate of successful data transmission; the unit Time here may be 1ms, 1s, or several Time slots). The quality of the link is obtained by the sending rate, and the average quality and the instantaneous quality of the link, such as the residual BLER, are obtained by different unit time. Different residual BLERs identify different qualities of the radio link. For example, a high average bit rate for a user indicates a high quality radio link, otherwise the quality of the radio link is low. For another example, the quality of the wireless link can be obtained according to the length and the length of the transmission delay of the data packet. In addition, the ratio of successful PDCCH or DCI reception may also directly identify the link quality. And then determining a source HARQ functional unit needing to be adjusted and/or an adjusted target HARQ functional unit according to the link quality of the first link corresponding to the HARQ functional unit. For example, a certain threshold of channel quality is set, and when the quality (e.g. BLER) of the link corresponding to the source HARQ functional unit is lower than the threshold, it indicates that the link quality is poor. And when the link quality difference reaches a certain preset number of times, reselecting the link for data transmission.

Specifically, the first MAC entity may record an ID, index information, or other identity information carried by an upper layer corresponding to each MAC Service Data Unit (SDU) in each packet. For example, if the upper layer Bearer is a Radio Bearer (RB), the RB ID of the RB is recorded; if the upper layer bearer is a Logical Channel (Logical Channel), the Logical Channel is a Logical Channel id (lch id); if the upper layer is quality of service flow (QoS flow), it is QoS flow ID. One MAC PDU (MAC packet) may include a plurality of upper layer bearer packets (i.e., MAC SDUs), and may be recorded according to different upper layer bearer IDs. Then, according to the ID, index information or other identity information carried by the upper layer, obtaining the data service quality requirement or service quality requirement carried by the upper layer, and setting a first link adjustment condition corresponding to the HARQ functional unit; then, the first MAC entity determines a source HARQ functional unit to be adjusted and/or an adjusted destination HARQ functional unit according to the link quality of the first link corresponding to the HARQ functional unit and the first link adjustment condition corresponding to the HARQ functional unit.

In the embodiment of the present invention, a data processing entity may be provided in layer 2 or layer 3 of the first communication device. In order to facilitate the data processing entity to perform control processing of data transmission, the first MAC entity may further send, according to the first parameter for data sending, data indication information to an upper layer, where the data indication information includes: information indicating retransmitted data that needs to be retransmitted, and/or information indicating successfully transmitted data. Wherein:

1) when the layer 2 of the first communication device includes a data processing entity (e.g., the data processing entity is configured in the RLC layer), the first MAC entity may send the data indication information to the data processing entity of the layer 2 (e.g., message M2 in fig. 2) and/or send the adjustment information of the first link to the control plane function entity of the layer 3 of the first communication device (e.g., message M3 in fig. 2).

2) When the layer 3 of the first communication device includes a data processing entity, the first MAC entity sends the data indication information to the data processing entity of the layer 2, and/or sends the adjustment information of the first link to a control plane function entity of the layer 3.

In addition, after the adjustment information and the data indication information of the first link are sent, the first MAC entity may further reset the HARQ process state corresponding to the source HARQ functional unit and discard data that has not been sent by the source HARQ functional unit after receiving the acknowledgement of receiving the adjustment information and the data indication information of the first link by the data processing entity.

According to at least one embodiment of the present invention, the first MAC entity may determine retransmission data that needs to be retransmitted according to data reception feedback information of the second communication device received by the source HARQ functional unit, and generate the data indication information.

According to at least one embodiment of the present invention, the first MAC entity may further send a data release message to the data processing entity, where the data release message carries information of an upper layer packet corresponding to a data packet that has been successfully sent by the source HARQ functional unit. After receiving the data release message, the data processing entity may delete the successfully transmitted data packet in the cache.

In this embodiment of the present invention, when the first link adjustment is required, the adjusted target HARQ functional unit may be a HARQ functional unit of the first MAC entity, and may also be a HARQ functional unit of another MAC entity (for convenience of description, referred to as a second MAC entity). Specifically, there are different scenarios as follows:

a) when the target HARQ functional unit is an HARQ functional unit of a first MAC entity, the control plane functional entity of layer 3 of the first communication device may generate and send a signaling message for adjusting the target HARQ functional unit and a corresponding first transmission link according to the adjustment information of the first link, where the first transmission link includes the first link. The signaling message is sent to the second communication device, so that the first communication device and the second communication device can adjust the target HARQ functional unit and the transmission link according to the signaling message, and thus, the subsequent first communication device can send the data of the second communication device through the target HARQ functional unit, and the second communication device can receive the data sent by the target HARQ functional unit.

b) When the target HARQ functional unit is an HARQ functional unit of a second MAC entity, the first MAC entity may further send adjustment information of a second link to the control plane functional entity of layer 3, where the second link is a link between the relevant HARQ functional unit and the data processing entity of the upper layer. Then, the control plane functional entity of layer 3 of the first communication device generates and sends a signaling message for adjusting the target HARQ functional unit and a corresponding second transmission link according to the adjustment information of the first link and the adjustment information of the second link, where the second transmission link includes the first link and the second link. The signaling message is sent to the second communication device, so that the first communication device and the second communication device can adjust the target HARQ functional unit and the transmission link according to the signaling message, and thus, the subsequent first communication device can send the data of the second communication device through the target HARQ functional unit, and the second communication device can receive the data sent by the target HARQ functional unit.

In the above scenarios a and b, generating and sending a signaling message for establishing the target HARQ functional unit and the corresponding link may specifically include:

1) when the first communication device is a network side device and the second communication device is a terminal, layer 3 of the first communication device initiates a link establishment or reconfiguration process of the target HARQ functional unit and the corresponding transmission link, and sends a link establishment or reconfiguration control signaling for the target HARQ functional unit and the corresponding transmission link to the terminal. The transmission link here may be the above first transmission link or the second transmission link.

2) When the first communication device is a terminal and the second communication device is a network side device, layer 3 of the first communication device sends a link establishment or reconfiguration request signaling for requesting the target HARQ functional unit and the corresponding transmission link to the network side device, and establishes or reconfigures the target HARQ functional unit and the corresponding transmission link according to a link establishment or reconfiguration control signaling returned by the network side device.

After the target HARQ functional unit and the corresponding transmission link are established or reconfigured, the data processing entity according to the embodiment of the present invention may further determine data to be sent according to the data indication information, and send the data to be sent to the target HARQ functional unit for sending. Here, the data to be transmitted may include new transmission data and/or retransmission data.

In the embodiment of the invention, when the source HARQ functional unit is the HARQ functional unit of a first MAC entity and the target HARQ functional unit is the HARQ functional unit of a second different MAC entity, an interactive interface can be established between the first MAC entity and the second MAC entity.

Under the condition that an interaction interface exists between the first MAC entity and the second MAC entity, after the establishment or reconfiguration of the target HARQ functional unit and the corresponding transmission link is completed, the first MAC entity can send residual data to the second MAC entity through the interaction interface, wherein the residual data comprises new transmission data which are not sent in a cache and data which need to be retransmitted; and the second MAC entity transmits the residual data through the target HARQ functional unit. Thus, data can be forwarded to the target HARQ function unit through the interactive interface between the MAC entities.

And under the condition that no interactive interface exists between the first MAC entity and the second MAC entity, the data processing entity may determine data to be transmitted according to the data indication information, and transmit the data to the destination HARQ functional unit for transmission.

In some cases, under the condition that the link quality of the first link corresponding to the source HARQ functional unit does not meet the preset requirement, a target HARQ functional unit that can meet the requirement may not be found, and at this time, in the embodiment of the present invention, the first MAC entity may further send, to the layer 3, a request message for requesting to send a data packet of the source HARQ functional unit on another cell, another frequency point, or another beam, where the another cell, another frequency point, or another beam is a cell, a frequency point, or a beam other than the cell, the frequency point, or the beam corresponding to the source HARQ functional unit.

The data transmission method of the present invention is explained in detail above. Fig. 4 further provides a schematic structural diagram of the MAC layer of a first communication device/second communication device for implementing the method. In fig. 4, a data control function entity is created in each MAC entity, and the data control function entity can perform the relevant steps performed by the first MAC entity in the above method. In addition, messages can be exchanged between the interaction interfaces between the MAC entities (as represented by M4 in fig. 4).

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. 5, an embodiment of the present invention provides a first communication device 50, which may specifically be a network side device (e.g., a base station, etc.) or a terminal. As shown in fig. 5, the first communication device 50 includes:

a first MAC entity 51, configured to acquire a first parameter of data transmission of a hybrid automatic repeat request HARQ functional unit created for a second communications device, where the HARQ functional unit includes a HARQ entity and/or a HARQ process; and sending adjustment information of a first link to an upper layer according to the first parameter sent by the data, wherein the first link is a link between a MAC layer and a lower layer to which a related HARQ functional unit belongs, and the related HARQ functional unit comprises: the source HARQ functional unit before adjustment and/or the destination HARQ functional unit after adjustment.

Optionally, the first MAC entity is further configured to determine, according to the obtained first parameter of the data sent by the HARQ functional unit, link quality of a first link corresponding to the HARQ functional unit; and determining a source HARQ functional unit needing to be adjusted and/or an adjusted target HARQ functional unit according to the link quality of the first link corresponding to the HARQ functional unit.

Optionally, the first parameter includes at least one of the following parameters:

Optionally, the first communication device further includes:

the first MAC entity is further configured to:

Optionally, the target HARQ functional unit is an HARQ functional unit of a first MAC entity;

Optionally, the target HARQ functional unit is an HARQ functional unit of a second MAC entity;

Optionally, the control plane function entity of layer 3 of the first communication device is further configured to:

Optionally, the data processing entity is further configured to determine, according to the data indication information, data to be sent after the target HARQ functional unit and the corresponding transmission link are established or reconfigured, and send the data to be sent to the target HARQ functional unit for sending, where the data to be sent includes newly transmitted data and/or retransmitted data.

Optionally, the first communication device further includes: a second MAC entity;

Optionally, the first MAC entity is further configured to send, to the layer 3, a request message for requesting to send a data packet of the source HARQ functional unit on another cell, another frequency point, or another beam, where the another cell, the another frequency point, or the another beam is a cell, a frequency point, or a beam other than the cell, the frequency point, or the beam corresponding to the source HARQ functional unit, if the target HARQ functional unit is not found.

Optionally, the first MAC entity is further configured to record an ID, index information, or other identity information carried by an upper layer corresponding to each MAC SDU in each data packet, obtain a data qos requirement or a service qos requirement carried by the upper layer according to the ID, index information, or other identity information carried by the upper layer, and set a first link adjustment condition corresponding to the HARQ functional unit; and determining a source HARQ functional unit needing to be adjusted and/or an adjusted target HARQ functional unit according to the link quality of the first link corresponding to the HARQ functional unit and the first link adjustment condition corresponding to the HARQ functional unit.

Optionally, the first MAC entity is further configured to, after sending the adjustment information and the data indication information of the first link and after receiving the reception acknowledgement of the adjustment information and the data indication information of the first link by the data processing entity, reset the HARQ process state corresponding to the source HARQ functional unit, and discard data that has not been sent by the source HARQ functional unit.

Optionally, the first MAC entity is further configured to determine retransmission data that needs to be retransmitted according to the data reception feedback information of the second communication device received by the source HARQ functional unit, and generate the data indication information.

Optionally, the first MAC entity is further configured to send a data release message to the data processing entity, where the data release message carries information of an upper data packet corresponding to a data packet that has been successfully sent by the source HARQ functional unit.

Optionally, the source HARQ functional unit and the destination HARQ functional unit are HARQ functional units of the same MAC entity or different MAC entities.

Optionally, when the HARQ functional unit is an HARQ process, the number of source HARQ processes for transmitting data before adjustment is different from the number of destination HARQ processes for transmitting the data after adjustment.

Optionally, the source HARQ functional unit and the destination HARQ functional unit are HARQ functional units of the same MAC entity, and the source HARQ functional unit and the destination HARQ functional unit respectively correspond to different bandwidth portions BWP.

It should be noted that the apparatus in this embodiment is an apparatus corresponding to the method shown in fig. 3, and the implementation manners in the above embodiments are all applicable to the embodiment of the apparatus, and the same technical effects can be achieved. The apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are not repeated here.

Referring to fig. 6, a schematic structural diagram of a first communication device according to an embodiment of the present invention is shown, where the first communication device 600 includes: a processor 601, a transceiver 602, a memory 603, a user interface 604 and a bus interface.

In the embodiment of the present invention, the first communication device 600 further includes: a program stored in the memory 603 and executable on the processor 601.

The processor 601, when executing the program, implements the following steps: '

Optionally, the processor further implements the following steps when executing the program:

acquiring a first parameter of data transmission of a hybrid automatic repeat request (HARQ) functional unit established for second communication equipment, wherein the HARQ functional unit comprises an HARQ entity and/or an HARQ process;

according to the first parameter of the data transmission, transmitting adjustment information of a first link to an upper layer, wherein the first link is a link between an MAC layer and a lower layer to which a related HARQ functional unit belongs, and the related HARQ functional unit comprises: the source HARQ functional unit before adjustment and/or the destination HARQ functional unit after adjustment.

It can be understood that, in the embodiment of the present invention, when being executed by the processor 601, the computer program can implement the processes of the data transmission method embodiment shown in fig. 3, and can achieve the same technical effects, and details are not described herein to avoid repetition.

In fig. 6, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 601 and various circuits of memory represented by memory 603 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 602 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 604 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 601 is responsible for managing the bus architecture and general processing, and the memory 603 may store data used by the processor 601 in performing operations.

It should be noted that the first communication device in this embodiment is a first communication device corresponding to the method shown in fig. 3, and the implementation manners in the above embodiments are all applied to the embodiment of the first communication device, and the same technical effects can be achieved. In the first communication device, the transceiver 602 and the memory 603, and the transceiver 602 and the processor 601 may be communicatively connected through a bus interface, and the functions of the processor 601 may also be implemented by the transceiver 602, and the functions of the transceiver 602 may also be implemented by the processor 601. It should be noted that, the first communication device provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as the method embodiment in this embodiment are not described herein again.

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, performs the steps of:

according to the first parameter of the data transmission, transmitting adjustment information of a first link to an upper layer, wherein the first link is a link between an MAC layer and a lower layer to which a related HARQ functional unit belongs, and the related HARQ functional unit comprises: the program of the source HARQ functional unit before adjustment and/or the program of the destination HARQ functional unit after adjustment, when executed by the processor, can implement all implementation manners in the data transmission method applied to the first communication device side, and can achieve the same technical effect, and details are not described here 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 method of data transmission, comprising:

2. The method of claim 1, wherein prior to sending the adjustment information for the first link, the method further comprises:

the first MAC entity determines the link quality of a first link corresponding to the HARQ functional unit according to the acquired first parameter of the number of the transmitted data of the HARQ functional unit;

3. The method of claim 2, wherein the first parameter comprises at least one of:

4. The method of claim 1, further comprising:

and/or the presence of a gas in the gas,

5. The method of claim 4, further comprising:

6. The method of claim 4,

the target HARQ functional unit is a HARQ functional unit of a second MAC entity;

the method further comprises the following steps:

7. The method of claim 5 or 6,

the step of generating and sending the signaling message for establishing the target HARQ functional unit and the corresponding link includes:

8. The method of claim 7,

after the target HARQ functional unit and the corresponding transmission link are established or reconfigured, the method further includes:

9. The method of claim 8,

when the target HARQ functional unit is an HARQ functional unit of a second MAC entity and an interactive interface exists between the first MAC entity and the second MAC entity, the method further includes:

10. The method of claim 8,

when the target HARQ functional unit is an HARQ functional unit of a second MAC entity and there is no interactive interface between the first MAC entity and the second MAC entity, the method further includes:

11. The method of claim 2,

in case the destination HARQ functional unit is not found, the method further comprises:

12. The method as claimed in claim 2, wherein the step of determining the source HARQ functional unit and/or the adjusted destination HARQ functional unit that needs to be adjusted according to the link quality of the first link corresponding to the HARQ functional unit includes:

13. The method of claim 4, wherein after sending the adjustment information and the data indication information for the first link, the method further comprises:

14. The method of claim 4, further comprising:

15. The method of claim 4, further comprising:

16. The method of claim 1,

the source HARQ functional unit and the target HARQ functional unit are HARQ functional units of the same MAC entity or different MAC entities.

17. The method of claim 1,

and when the HARQ functional unit is an HARQ process, the number of source HARQ processes for sending data before adjustment is different from the number of target HARQ processes for sending the data after adjustment.

18. The method of claim 1,

the source HARQ functional unit and the destination HARQ functional unit are HARQ functional units of the same MAC entity, and the source HARQ functional unit and the destination HARQ functional unit respectively correspond to different bandwidth parts BWP.

19. A first communications device, comprising: a first MAC entity; wherein the content of the first and second substances,

20. The first communications device of claim 19,

the first MAC entity is further configured to determine, according to the acquired first parameter of the transmission data of the HARQ functional unit, link quality of a first link corresponding to the HARQ functional unit; and determining a source HARQ functional unit needing to be adjusted and/or an adjusted target HARQ functional unit according to the link quality of the first link corresponding to the HARQ functional unit.

21. The first communications device of claim 19, further comprising:

the first MAC entity is further configured to:

22. The first communications device of claim 21,

23. The first communications device of claim 21,

24. The first communications device of claim 22 or 23,

25. The first communications device of claim 24,

and the data processing entity is further configured to determine data to be sent according to the data indication information after the target HARQ functional unit and the corresponding transmission link are established or reconfigured, and send the data to be sent to the target HARQ functional unit for sending, where the data to be sent includes newly transmitted data and/or retransmitted data.

26. The first communications device of claim 25, further comprising:

a second MAC entity;

27. The first communications device of claim 25, further comprising:

a second MAC entity;

28. The first communications device of claim 20,

the first MAC entity is further configured to send, to the layer 3, a request message for requesting to send a data packet of the source HARQ functional unit on another cell, another frequency point, or another beam, where the another cell, the another frequency point, or the another beam is a cell, a frequency point, or a beam other than the cell, the frequency point, or the beam corresponding to the source HARQ functional unit, if the target HARQ functional unit is not found.

29. The first communications device of claim 20,

the first MAC entity is further configured to record an ID, index information, or other identity information borne by an upper layer corresponding to each MAC SDU in each data packet, obtain a data qos requirement or a service qos requirement borne by the upper layer according to the ID, index information, or other identity information borne by the upper layer, and set a first link adjustment condition corresponding to the HARQ functional unit; and determining a source HARQ functional unit needing to be adjusted and/or an adjusted target HARQ functional unit according to the link quality of the first link corresponding to the HARQ functional unit and the first link adjustment condition corresponding to the HARQ functional unit.

30. A first communications device comprising a transceiver and a processor, wherein,

31. A first communications device, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the data transmission method according to any one of claims 1 to 18.

32. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the data transmission method according to one of claims 1 to 18.