CN113922930B

CN113922930B - Data transmission method and device

Info

Publication number: CN113922930B
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: 2024-05-28
Anticipated expiration: 2040-07-09
Also published as: CN113922930A

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 created for a second communication device, wherein the HARQ functional unit comprises an HARQ entity and/or an HARQ process; the first MAC entity sends, to an upper layer, adjustment information of a first link according to the first parameter of the data transmission, where the first link is a link between a MAC layer to which a relevant HARQ functional unit belongs and a lower layer, and the relevant HARQ functional unit includes: a source HARQ functional unit before adjustment and/or a destination HARQ functional unit after adjustment. The embodiment of the invention can judge whether the link adjustment is needed or not according to the data transmission condition by the MAC layer, can improve the flexible control capability of the MAC layer, can reduce the time delay of the data packet receiving confirmation, and can reduce the cost required by transmitting the transmission state packet between the first communication equipment and the second communication equipment.

Description

Data transmission method and device

Technical Field

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

Background

The current five-generation mobile communication (5G) radio Access layer (AS) protocol stack still employs an automatic retransmission request (Automatic Repeat reQuest, ARQ) and a hybrid automatic retransmission request (Hybrid Automatic Repeat reQuest, HARQ) two-layer packet retransmission mechanism, and defines that layer 2 (L2) includes a service data adaptation protocol (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 (Medium Access Control, MAC) layer. Wherein ARQ is in RLC layer and HARQ is in MAC layer.

And according to the protocol, the HARQ entity performs control of successful or failed data transmission on an air interface. If the data is not yet successfully transmitted when the maximum number of times the HARQ entity transmits is reached, the HARQ entity will reset the HARQ process, i.e. it is equivalent to dropping the data packet. The HARQ entity typically does not report the information of the discarded data packet to the upper layer. The upper layer processes only by a fault tolerance mechanism specified by the protocol, for example, an automatic repeat request (Automatic Repeat reQuest, ARQ) protocol judges according to a status packet sent by the ARQ of the peer, and a transmission control protocol (Transmission Control Protocol, TCP) layer judges according to a status packet sent by the TCP layer of the peer, etc. The ARQ receives the status packet sent by the RLC at the peer end to obtain information (NACK information) of data transmission failure, which does not fully exert flexible control capability of the MAC layer, and also brings about overhead of sending the status packet and delay caused by acknowledgement of the status packet.

This approach is required to be redesigned for the design goal of the next generation mobile communication's Network to date (Lite Network).

Disclosure of Invention

At least one embodiment of the invention provides a data transmission method and device, provides a scheme that a MAC layer triggers link adjustment according to data transmission conditions, and improves flexible control capability of the MAC layer.

According to one 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 created for a second communication device, wherein the HARQ functional unit comprises an HARQ entity and/or an HARQ process;

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

Furthermore, in accordance with at least one embodiment of the present invention, before transmitting the adjustment information of 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 transmission data of the HARQ functional unit;

And determining a source HARQ functional unit 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.

Furthermore, in accordance with at least one embodiment of the present invention, the first parameter comprises 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 of transmission when each data packet is successfully transmitted, the code rate when the data packet is transmitted, the SNR or SINR when the data packet is transmitted, the position of a radio resource block used when each data packet is transmitted in the whole system bandwidth and the size of the radio resource block, the power when the data packet is transmitted, the scheduling number of times in unit time and the size of the transmitted data packet, the ratio of the receiving errors of a physical downlink control channel PDCCH, the ratio of the receiving errors of downlink control information DCI carried by the PDCCH and the data packet transmission time delay, wherein the data packet transmission time delay is time delay of one-time transmission success and/or time delay of repeated retransmission transmission success.

Furthermore, 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 of the data transmission, wherein the data indication information comprises: indication information of retransmission data which needs to be retransmitted and/or indication information of successful data is sent; the data indication information is sent to a data processing entity, and the data processing entity is arranged on the layer 2 or the layer 3;

and/or the number of the groups of groups,

And sending the adjustment information of the first link to a control plane functional entity of the first communication device, wherein the control plane functional entity is arranged in the layer 3.

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

and the control plane functional entity of the layer 3 of the first communication equipment generates and transmits a signaling message for adjusting the target HARQ functional unit and a corresponding transmission link according to the adjustment information of the first link, wherein the transmission link comprises the first link.

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

the method further comprises the steps of:

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

And the control plane functional entity of the layer 3 of the first communication equipment generates and transmits 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, wherein the transmission link comprises 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 destination HARQ functional unit and the corresponding link includes:

when the first communication equipment is network side equipment and the second communication equipment is a terminal, layer 3 of the first communication equipment initiates a link establishment or reconfiguration process of the target HARQ functional unit and a 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, the layer 3 of the first communication device sends a link establishment or reconfiguration request signaling for requesting the destination HARQ functional unit and a corresponding transmission link to the network side device, and establishes or reconfigures the destination 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 destination HARQ functional unit and the corresponding transmission link establishment or reconfiguration are completed, the method further comprises:

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 new transmission data and/or retransmission 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 there is an interworking interface between the first MAC entity and the second MAC entity, the method further includes:

After the destination HARQ functional unit and the corresponding transmission link are established or reconfigured, the first MAC entity sends residual data to the second MAC entity through the interactive interface, wherein the residual data comprises new transmission data which is not yet sent in a cache and data which needs to be retransmitted; the second MAC entity sends the residual data through the destination 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 transmitted according to the data indication information and transmits the data to the target HARQ functional unit for transmission.

Furthermore, in accordance with at least one embodiment of the present invention, in case the destination HARQ functional unit is not found, the method further comprises:

The first MAC entity sends a request message to the layer 3, where the request message is used to request to send a data packet of the source HARQ functional unit on another cell, another frequency point, or another beam, where the other 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.

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

The first MAC entity records the ID, index information or other identity information of the upper layer bearing corresponding to each MAC SDU in each data packet, obtains the data service quality requirement or the service quality requirement of the upper layer bearing according to the ID, index information or other identity information of the upper layer bearing, and sets a first link adjustment condition corresponding to the HARQ functional unit;

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

Furthermore, 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 receiving confirmation of the data processing entity to the adjustment information and the data indication information of the first link, the first MAC entity resets the HARQ process state corresponding to the source HARQ functional unit and discards the data which is not transmitted 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 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 of different MAC entities.

Further, 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 adjustment is different from the number of destination HARQ processes for transmitting the data after 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, which 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 first MAC entity is configured to obtain a first parameter of 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; and 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 a MAC layer to which a relevant HARQ functional unit belongs and a lower layer, and the relevant HARQ functional unit includes: a source HARQ functional unit before adjustment and/or a 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 obtained first parameter of the transmission data of the HARQ functional unit, a link quality of a first link corresponding to the HARQ functional unit; and determining 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.

Furthermore, in accordance with at least one embodiment of the present invention, the first communication device further comprises:

A data processing entity arranged on layer 2 or layer 3, and a control plane functional entity arranged on layer 3;

the first MAC entity is further configured to:

Transmitting data indication information to an upper layer according to the first parameter of the data transmission, wherein the data indication information comprises: indication information of retransmission data which needs to be retransmitted and/or indication information of successful data is sent; 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.

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

And the control plane functional entity of the layer 3 of the first communication device is configured to generate and send a signaling message for adjusting the destination 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.

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

And the control plane functional entity of the layer 3 of the first communication device is used for generating and transmitting 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, wherein the transmission link comprises the first link and the second link.

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

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

when the first communication equipment is network side equipment and the second communication equipment is a terminal, initiating a link establishment or reconfiguration process of the target HARQ functional unit and a 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;

When the first communication equipment is a terminal and the second communication equipment is network side equipment, a link establishment or reconfiguration request signaling for requesting the target HARQ functional unit and a corresponding transmission link is sent to the network side equipment, and the target HARQ functional unit and the corresponding transmission link are established or reconfigured according to the link establishment or reconfiguration control signaling returned by the network side equipment.

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 destination HARQ functional unit and the corresponding transmission link are established or reconfigured, and send the data to be sent to the destination HARQ functional unit for sending, where the data to be sent includes new transmission data and/or retransmission 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 interaction interface, remaining data to the second MAC entity after the destination HARQ functional unit and the corresponding transmission link are established or reconfigured, where the remaining data includes new transmission data that is not yet sent in the cache and data that needs to be retransmitted; the second MAC entity sends the residual data through the destination HARQ functional unit.

A second MAC entity;

The target HARQ functional unit is an HARQ functional unit of a second MAC entity, and no interactive interface exists between the first MAC entity and the second MAC entity;

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 destination HARQ functional unit for sending.

Furthermore, 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, where the other cell, the other frequency point, or the other 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 destination HARQ functional unit is not found.

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 of an upper layer bearer corresponding to each MAC SDU in each data packet, obtain a data quality of service requirement or a service quality requirement of the upper layer bearer according to the ID, index information, or other identity information of the upper layer bearer, and set a first link adjustment condition corresponding to the HARQ functional unit; and determining a source HARQ functional unit 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.

According to 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 obtain a first parameter of 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 a MAC layer to which a relevant HARQ functional unit belongs and a lower layer, and the relevant HARQ functional unit includes: a source HARQ functional unit before adjustment and/or a 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 when executed by the processor implements 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 stored thereon a program which, when executed by a processor, implements the steps of the method as described above.

Compared with the prior art, the data transmission method and the data transmission device 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 transmission 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 in time, can reduce the time delay of data packet receiving confirmation, and reduces the cost required by transmitting the sending 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 designate like parts throughout the figures. In the drawings:

fig. 1 is a schematic diagram 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 a MAC layer of a first/second communication device according to an 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 a first communication device according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may 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, 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 may be interchanged where appropriate such that the embodiments of the application described herein may be implemented, for example, 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. "and/or" in the specification and claims means at least one of the connected objects.

The techniques described herein are not limited to NR systems and long term evolution (Long Time Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, and may also be used in various wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single-carrier frequency division multiple access (Single-carrier Frequency-Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. A CDMA system may implement radio technologies such as CDMA2000, universal terrestrial radio access (Universal Terrestrial Radio Access, UTRA), and the like. UTRA includes wideband CDMA (Wideband Code Division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as the global system for mobile communications (Global System for Mobile Communication, GSM). OFDMA systems may implement radio technologies such as ultra mobile broadband (UltraMobile Broadband, UMB), evolved UTRA (E-UTRA), IEEE 802.21 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, flash-OFDM, and the like. UTRA and E-UTRA are parts of the universal mobile telecommunications system (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, LTE-a and GSM are described in the literature from an organization named "third generation partnership project" (3rd Generation Partnership Project,3GPP). CDMA2000 and UMB are described in the literature from an organization named "third generation partnership project 2" (3 GPP 2). The techniques described herein may be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. However, the following description describes an 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 as 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. Additionally, 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), and the terminal 11 may be a terminal-side device such as a Mobile phone, a tablet Computer (Tablet Personal Computer), a Laptop (Laptop Computer), a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), a Mobile internet device (Mobile INTERNET DEVICE, MID), a wearable device (Wearable Device), or a vehicle-mounted device, which is not limited to the specific type of the terminal 11 in the embodiment of the present invention. The network device 12 may be a base station and/or a core network element, where the base station may be a 5G or later version base station (e.g., a gNB, 5G NRNB, etc.), or a base station in another communication system (e.g., an eNB, a WLAN access point, or other access points, etc.), where the base station may be referred to as a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, a BTS), a radio base station, a radio transceiver, a Basic service set (Basic SERVICE SET, BSS), an Extended service set (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, so long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary, and it should be noted that, in the embodiment of the present invention, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

The base stations may communicate with the terminal 11 under the control of a base station controller, which may be part of the core network or some base stations in various examples. Some base stations may communicate control information or user data with the core network over a backhaul. In some examples, some of these base stations may communicate with each other directly or indirectly over a backhaul link, which may be a wired or wireless communication link. A wireless communication system may support operation on multiple carriers (waveform signals of different frequencies). A multicarrier transmitter may transmit modulated signals on the multiple carriers simultaneously. For example, each communication link may be a multicarrier 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 corresponding coverage area. The coverage area of an access point may be partitioned into sectors that form only a portion of that coverage area. A wireless communication system may include different types of base stations (e.g., macro base stations, micro base stations, or pico base stations). The base station 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 the same or different types of base stations, coverage areas utilizing the same or different radio technologies, or coverage areas belonging to the same or different access networks, may overlap.

The communication link in the wireless communication system may include an Uplink for carrying Uplink (UL) transmissions (e.g., from the terminal 11 to the network device 12) or a Downlink for carrying Downlink (DL) transmissions (e.g., from the network device 12 to the terminal 11). UL transmissions may also be referred to as reverse link transmissions, while DL transmissions may also be referred to as forward link transmissions. Downlink transmissions may be made using licensed bands, unlicensed bands, or both. Similarly, uplink transmissions may be made using licensed bands, unlicensed 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 provided, in Layer 2 (Layer 2) of the first communication device/the second communication device, with a data processing entity, where one data processing entity may send data through multiple HARQ entities of a MAC Layer. The same device may be used as a first communication device to send data to the peer device, or may be used as a second communication device to receive data sent by the peer device. In addition, the data processing entity may also be arranged at layer 3 of the first communication device/second communication device.

Referring to fig. 3, a data transmission method provided by 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, or 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 the first parameter of the 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 provided 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 typically corresponds to one second communication device, and one HARQ entity may include at least one HARQ process therein, each for transmitting data to the second communication device to which the HARQ entity corresponds. The first MAC entity may obtain a first parameter of data transmission of the HARQ functional unit within the MAC entity, e.g. receive the first parameter of data transmission of the HARQ functional unit within the MAC entity. In addition, the first MAC entity may also obtain the first parameter of the data transmission of the HARQ functional unit in the other MAC entity, for example, receive the first parameter of the data transmission of the HARQ functional unit in the other MAC entity through an interface between 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 typically a terminal; when the first communication device is a terminal, the second communication device is typically a network-side device or other terminal device.

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

The data packet transmission delay includes a data packet size, a Block Error Rate (BLER), a residual BLER, a number of times each data packet needs to be transmitted when transmission is successful, a code Rate when the data packet is transmitted, a Signal-to-Noise Ratio (SNR) or a Signal-to-interference plus Noise Ratio (SINR) when the data packet is transmitted, a position of a radio resource Block and a size of a radio resource Block used when each data packet is transmitted in an entire system bandwidth, a power when the data packet is transmitted, a scheduling number per unit time (e.g., one second) and a size of the transmitted data packet, a Ratio of a physical downlink control channel (Physical downlink control channel, PDCCH) reception Error, a Ratio of downlink control information (Downlink Control Information, DCI) carried by the PDCCH, and a data packet transmission delay, wherein the data packet transmission delay is a delay of a transmission success and/or a delay of a retransmission transmission success.

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

Here, the first MAC entity may determine whether adjustment of the first link is required 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 herein as a source HARQ functional unit) does not meet a preset requirement, the first MAC entity may decide to adjust transmission of relevant data to another HARQ functional unit (for convenience of description, referred to herein as a destination HARQ functional unit), and at this time, it is required to adjust a link between a MAC layer to which the relevant HARQ functional unit belongs and a lower layer (which may be a physical layer in particular), so that the first MAC entity will send adjustment information of the first link to an upper layer. The adjustment information of the first link may include content such as indication information of the source HARQ functional unit before adjustment and/or the destination HARQ functional unit after adjustment. The adjustment information of the first link is sent to the upper layer, specifically, 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 (BWP), 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 MAC layer can determine whether link adjustment is needed according to the data transmission condition, so that the flexible control capability of the MAC layer is improved. Compared with the schemes of obtaining information of data transmission failure and the like by receiving a status packet sent by the opposite-end RLC in the prior art, the embodiment of the invention can discover possible faults in a link earlier and adjust in time, can reduce the time delay of data packet receiving confirmation, and can reduce the cost required by transmitting the status packet between the first communication equipment and the second communication equipment.

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 the link quality of the first link corresponding to the HARQ functional unit according to the obtained first parameter of the transmission data of the HARQ functional unit. For example, according to the obtained data transmission rate (i.e. the rate of successful data transmission) in a unit Time, the unit Time can be 1ms,1s, or a plurality of Time slots Time Slot. The quality of the link is obtained by the transmission rate and the average quality and instantaneous quality of the link, such as the residual BLER, are obtained by different unit times. Different residual BLERs identify different qualities of the radio link. For example, a high average code rate for the user indicates a high radio link quality, otherwise a low radio link quality. 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 rate of successful reception of PDCCH or DCI may also directly identify the link quality. And then determining 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. For example, a threshold value of a certain channel quality is set, and when the quality (such as BLER) of the link corresponding to the source HARQ functional unit is lower than the threshold value, it is indicated that the link quality is poor. When the link quality difference reaches a certain preset number of times, the link can be reselected 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 (SERVICE DATA Unit, SDU) in each data 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), it is a Logical Channel ID (LCH ID); if the upper layer is a quality of service flow (QoS flow), it is a QoS flow ID. A MAC PDU (MAC packet) may include a plurality of packets carried by an upper layer (i.e., MAC SDUs), and may be recorded according to different upper layer carrier IDs. Then, according to the ID, index information or other identity information carried by the upper layer, obtaining the data service quality requirement or business service quality requirement carried by the upper layer, and setting a first link adjustment condition corresponding to the HARQ functional unit; and then, the first MAC entity determines a source HARQ functional unit and/or an adjusted target HARQ functional unit to be adjusted according to the link quality of the first link corresponding to the HARQ functional unit and a first link adjustment condition corresponding to the HARQ functional unit.

In the embodiment of the present invention, the data processing entity may be set in layer 2 or layer 3 of the first communication device. In order to facilitate the control processing of data transmission by the data processing entity, the first MAC entity may further send, to an upper layer, data indication information according to the first parameter of the data transmission, where the data indication information includes: indication of retransmitted data requiring retransmission and/or indication of successful data transmission. Wherein:

1) when the layer 2 of the first communication device includes a data processing entity (e.g. a data processing entity is set in the RLC layer), the first MAC entity may send the data indication information to the data processing entity of 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 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 sending the adjustment information and the data indication information of the first link, the first MAC entity may further reset the HARQ process state corresponding to the source HARQ functional unit after receiving the acknowledgement of the data processing entity to the adjustment information and the data indication information of the first link, and discard the data that has not yet been sent by the source HARQ functional unit.

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 packet that has been successfully sent by the source HARQ functional unit. After receiving the data release message, the data processing entity can delete the successfully sent data packet in the cache.

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

a) When the destination HARQ functional unit is a HARQ functional unit of the first MAC entity, the control plane functional entity of layer 3 of the first communications device may generate and send a signaling message for adjusting the destination 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 destination HARQ functional unit and the transmission link according to the signaling message, and thus the subsequent first communication device can send data of the second communication device through the destination HARQ functional unit, and the second communication device can receive the data sent by the destination HARQ functional unit.

B) When the destination HARQ functional unit is a HARQ functional unit of the second MAC entity, the first MAC entity may further send adjustment information of a second link to a control plane functional entity of layer 3, where the second link is a link between the relevant HARQ functional unit and a data processing entity of an upper layer. And then, the control plane functional entity of the layer 3 of the first communication device generates and transmits a signaling message for adjusting the destination 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, wherein the second transmission link comprises 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 destination HARQ functional unit and the transmission link according to the signaling message, and thus the subsequent first communication device can send data of the second communication device through the destination HARQ functional unit, and the second communication device can receive the data sent by the destination HARQ functional unit.

In the above scenarios a and b, generating and sending a signaling message for establishing the destination 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 destination HARQ functional unit and a corresponding transmission link, and sends a link establishment or reconfiguration control signaling for the destination HARQ functional unit and the corresponding transmission link to the terminal. The transmission link here may be the first transmission link above or the second transmission link.

2) When the first communication device is a terminal and the second communication device is a network side device, the layer 3 of the first communication device sends a link establishment or reconfiguration request signaling for requesting the destination HARQ functional unit and a corresponding transmission link to the network side device, and establishes or reconfigures the destination 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 destination 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 destination 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 the first MAC entity and the target HARQ functional unit is the HARQ functional unit of the 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 interactive interface exists between the first MAC entity and the second MAC entity, after the establishment or reconfiguration of the destination 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 interactive interface, wherein the residual data comprises new transmission data which are not yet sent in a cache and data which need to be retransmitted; the second MAC entity sends the residual data through the destination HARQ functional unit. In this way, the data can be forwarded to the destination HARQ functional unit through the interworking interface between MAC entities.

And under the condition that an interactive interface does not exist between the first MAC entity and the second MAC entity, the data processing entity can determine data to be transmitted according to the data indication information and transmit the data to the target 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, the target HARQ functional unit capable of meeting the requirement may not be found, and in this case, the first MAC entity may also send a request message to the layer 3 for requesting to send the data packet of the source HARQ functional unit on other cells, other frequency points or other beams, where the other cells, other frequency points or other beams are cells, frequency points or beams other than the cells, frequency points or beams corresponding to the source HARQ functional unit.

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

The foregoing describes various methods of embodiments of the present invention. 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 (such as a base station) or a terminal. As shown in fig. 5, the first communication device 50 includes:

A first MAC entity 51, configured to obtain a first parameter of 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; and 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 a MAC layer to which a relevant HARQ functional unit belongs and a lower layer, and the relevant HARQ functional unit includes: a source HARQ functional unit before adjustment and/or a destination HARQ functional unit after adjustment.

Optionally, the first MAC entity is further configured to determine, according to the obtained 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 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.

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 destination HARQ functional unit is a HARQ functional unit of the first MAC entity;

Optionally, the destination HARQ functional unit is a HARQ functional unit of the 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 destination HARQ functional unit and the corresponding transmission link are established or reconfigured, and send the data to be sent to the destination HARQ functional unit for sending, where the data to be sent includes new transmission data and/or retransmission 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 other 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, if the destination HARQ functional unit is not found.

Optionally, the first MAC entity is further configured to record an ID, index information, or other identity information of an upper layer bearer corresponding to each MAC SDU in each data packet, obtain a data quality requirement or a service quality requirement of the upper layer bearer according to the ID, index information, or other identity information of the upper layer bearer, and set a first link adjustment condition corresponding to the HARQ functional unit; and determining a source HARQ functional unit 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, reset the HARQ process state corresponding to the source HARQ functional unit after receiving acknowledgement of the data processing entity on the adjustment information and the data indication information of the first link, and discard data that has not yet 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 data receiving 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 layer 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.

The device in this embodiment corresponds to the method shown in fig. 3, and the implementation manner in each embodiment is applicable to the embodiment of the device, so that the same technical effects can be achieved. The device provided by the embodiment of the invention can realize all the method steps realized by the embodiment of the method and can achieve the same technical effects, and the parts and the beneficial effects which are the same as those of the embodiment of the method in the embodiment are not described in detail.

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

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

The processor 601, when executing the program, performs the steps of: '

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 created 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 a MAC layer to which a relevant HARQ functional unit belongs and a lower layer, and the relevant HARQ functional unit includes: a source HARQ functional unit before adjustment and/or a destination HARQ functional unit after adjustment.

It can be appreciated that in the embodiment of the present invention, when the computer program is executed by the processor 601, the processes of the embodiment of the data transmission method shown in fig. 3 can be implemented, and the same technical effects can be achieved, so that repetition is avoided, and detailed description is omitted here.

In fig. 6, a bus architecture may comprise any number of interconnected buses and bridges, with various circuits of the one or more processors, represented in particular by processor 601, and the memory, represented in memory 603. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 602 may be a number of elements, i.e., including a transmitter and a receiver, providing 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 an inscribed desired device for a different user device, 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.

Note that, the first communication device in this embodiment is a first communication device corresponding to the method shown in fig. 3, and the implementation manner in each of the embodiments described above is applicable to the embodiment of the first communication device, so that 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 functions of the processor 601 may also be implemented by the transceiver 602, and functions of the transceiver 602 may also be implemented by the processor 601. It should be noted that, the first communication device provided in this embodiment of the present invention can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are omitted.

In some embodiments of the present invention, there is also provided a computer-readable storage medium having stored thereon a program 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 a MAC layer to which a relevant HARQ functional unit belongs and a lower layer, and the relevant HARQ functional unit includes: the source HARQ functional unit before adjustment and/or the destination HARQ functional unit after adjustment can implement all the implementation manners in the data transmission method applied to the first communication device side when the program is executed by the processor, and can achieve the same technical effects, so that repetition is avoided, and no further description is provided here.

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 solution. 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 will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the embodiment of the present invention.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in 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 this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. A data transmission method, comprising:

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

The adjustment information of the first link includes indication information of the adjusted destination HARQ functional unit.

2. The method of claim 1, wherein prior to transmitting 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 transmission data of the HARQ functional unit;

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

4. The method as recited in claim 1, further comprising:

and/or the number of the groups of groups,

5. The method as recited in claim 4, further comprising:

6. The method of claim 4, wherein,

The target HARQ functional unit is an HARQ functional unit of the second MAC entity;

the method further comprises the steps of:

7. The method of claim 5 or 6, wherein,

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

8. The method of claim 7, wherein,

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

9. The method of claim 8, wherein,

When the destination HARQ functional unit is a HARQ functional unit of a second MAC entity and there is an interaction interface between the first MAC entity and the second MAC entity, the method further includes:

10. The method of claim 8, wherein,

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:

11. The method of claim 2, wherein,

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

The first MAC entity sends 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 to layer 3, where the other cell, the other frequency point, or the other 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.

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

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

14. The method as recited in claim 4, further comprising:

15. The method as recited in claim 4, further comprising:

16. The method of claim 1, wherein,

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

17. The method of claim 1, wherein,

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.

18. The method of claim 1, wherein,

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 communication device, comprising: a first MAC entity; wherein,

The first MAC entity is configured to obtain a first parameter of 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; and 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 a MAC layer to which a relevant HARQ functional unit belongs and a lower layer, and the relevant HARQ functional unit includes: a source HARQ functional unit before adjustment and/or a destination HARQ functional unit after adjustment;

20. The first communication device of claim 19,

The first MAC entity is further configured to determine, according to the obtained 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 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.

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

the first MAC entity is further configured to:

22. The first communication device of claim 21, wherein,

23. The first communication device of claim 21, wherein,

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

25. The first communication device of claim 24,

The data processing entity is further configured to determine data to be sent according to the data indication information after the destination HARQ functional unit and the corresponding transmission link are established or reconfigured, and send the data to be sent to the destination HARQ functional unit for sending, where the data to be sent includes new transmission data and/or retransmission 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 communication device of claim 20, wherein,

The first MAC entity is further configured to send, to 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 other 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, if the destination HARQ functional unit is not found.

29. The first communication device of claim 20, wherein,

The first MAC entity is further configured to record an ID, index information, or other identity information of an upper layer bearer corresponding to each MAC SDU in each data packet, obtain a data quality requirement or a service quality requirement of the upper layer bearer according to the ID, index information, or other identity information of the upper layer bearer, and set a first link adjustment condition corresponding to the HARQ functional unit; and determining a source HARQ functional unit 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 communication device comprising a transceiver and a processor, wherein,

The processor is configured to obtain a first parameter of 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 a MAC layer to which a relevant HARQ functional unit belongs and a lower layer, and the relevant HARQ functional unit includes: a source HARQ functional unit before adjustment and/or a destination HARQ functional unit after adjustment;

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

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