CN113114411A

CN113114411A - Data transmission method and device

Info

Publication number: CN113114411A
Application number: CN202010033910.5A
Authority: CN
Inventors: 文鸣; 刘进华
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2021-07-13
Anticipated expiration: 2040-01-13
Also published as: WO2021143728A1; CN113114411B

Abstract

The embodiment of the invention discloses a data transmission method and equipment, which are used for solving the problem of poor flexibility of data transmission. The method comprises the following steps: determining a transmission mode of a data block according to the size of the data block; transmitting the data block by the transmission mode; the transmission mode comprises network coding transmission or data packet repeated transmission. In the embodiment of the invention, the wireless communication equipment can dynamically select the transmission mode of the data block between network coding transmission and data packet repeated transmission according to the size of the data block, and transmit the data block through the selected transmission mode, so that the flexibility of data transmission is high.

Description

Data transmission method and device

Technical Field

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

Background

In the related transmission scheme, (hybrid) arq transmission may be used to ensure the stability of the communication system, however, the above transmission scheme may generate a certain delay and may not satisfy some scenarios with low delay requirements.

The problem of large delay can be solved to a certain extent by adopting a transmission mode of data packet repeated transmission (carrier aggregation CA/dual-connection DC PDCP packet duplicate). However, in order to solve the problem of the large delay, the wireless communication device in the related art can only use the transmission mode of the data packet repeat transmission, and cannot select the transmission mode of the data, so that the flexibility of the data transmission is poor.

Disclosure of Invention

An object of the embodiments of the present invention is to provide a data transmission method and device, so as to solve the problem of poor flexibility of data transmission.

In a first aspect, a data transmission method is provided, where the method includes: determining a transmission mode of a data block according to the size of the data block; transmitting the data block by the transmission mode; the transmission mode comprises network coding transmission or data packet repeated transmission.

In a second aspect, a data transmission method is provided, the method including: receiving a data block, wherein the data block carries indication information; determining a transmission mode of the data block according to the indication information; wherein, the transmission mode comprises network coding transmission or data packet repeated transmission; and processing the data block according to the transmission mode.

In a third aspect, a wireless communication device is provided, including: the determining module is used for determining the transmission mode of the data block according to the size of the data block; the transmission module is used for transmitting the data block through the transmission mode; the transmission mode comprises network coding transmission or data packet repeated transmission.

In a fourth aspect, there is provided a wireless communication device comprising: the transmission module is used for receiving a data block, and the data block carries indication information; a determining module, configured to determine a transmission mode of the data block according to the indication information; wherein, the transmission mode comprises network coding transmission or data packet repeated transmission; and the processing module is used for processing the data block according to the transmission mode.

In a fifth aspect, a wireless communication device is provided, which comprises a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the data transmission method according to any one of the first and second aspects.

A sixth aspect provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements a data transmission method as claimed in any one of the first and second aspects.

In the embodiment of the invention, the wireless communication equipment can dynamically select the transmission mode of the data block between network coding transmission and data packet repeated transmission according to the size of the data block, and transmit the data block through the selected transmission mode, so that the flexibility of data transmission is high.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic flow diagram of a data transmission method according to one embodiment of the invention;

fig. 2 is a schematic diagram of a data plane protocol stack in a data transmission method according to an embodiment of the present invention;

FIG. 3 is a partial flow diagram of a data transmission method according to an embodiment of the invention;

FIG. 4 is a schematic diagram of an indication domain in which indication information is located according to an embodiment of the invention;

FIG. 5 is a schematic diagram of an indication domain in which indication information is located according to another embodiment of the present invention;

FIG. 6 is a schematic diagram of an indication domain in which indication information is located according to yet another embodiment of the present invention;

FIG. 7 is a schematic flow chart diagram of a data transmission method according to one embodiment of the present invention;

fig. 8 is a schematic structural diagram of a wireless communication device according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a wireless communication device according to another embodiment of the present invention;

fig. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a network device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. "and/or" in various embodiments of the present specification means at least one of front and rear.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, for example: a Long Term Evolution (LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD) System, a Universal Mobile Telecommunications System (UMTS) or Worldwide Interoperability for Microwave Access (WiMAX) communication System, a 5G System, a New Radio (NR) System, or a subsequent Evolution communication System.

In the embodiment of the present invention, the Terminal device may include, but is not limited to, a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), a Mobile phone (Mobile Telephone), a User Equipment (UE), a handset (handset), a portable device (portable Equipment), a vehicle (vehicle), etc., and the Terminal device may communicate with one or more core networks through a Radio Access Network (RAN), for example, the Terminal device may be a Mobile phone (or referred to as a "cellular" phone), a computer with a wireless communication function, and the Terminal device may also be a portable, pocket, handheld, computer-embedded, or vehicle-mounted Mobile apparatus.

In the embodiment of the present invention, the network device is a device deployed in a radio access network to provide a wireless communication function for a terminal device. The network device may be a base station, and the base station may include various macro base stations, micro base stations, relay stations, access points, and the like. In systems employing different radio access technologies, the names of devices having a base station function may differ. For example, in an LTE network, called an Evolved node B (eNB or eNodeB), in a third Generation (3G) network, called a node B (node B), or a network device in a later Evolved communication system, etc., although the words are not limiting.

As shown in fig. 1, an embodiment of the present invention provides a data transmission method 100, which may be performed by a wireless communication device, which may be a terminal device or a network device, in other words, the method may be performed by software or hardware installed in the wireless communication device.

The wireless communication device may be a terminal device in a Uu interface; also can be IAB node in mobile self-feedback (IAB) system; it may also be a terminal device in a sidelink (sidelink) communication system, etc.; but also a network relay node (relay) and the like. The method 100 includes the steps of:

s102: and determining the transmission mode of the data block according to the size of the data block.

Optionally, this step is performed by a Packet Data Convergence Protocol (PDCP) layer of the wireless communication device, where the size of the Data block may be the size of a PDCP Protocol Data Unit (PDU) Packet (i.e., a PDCP PDU Packet size), and in the following embodiment, the PDCP PDU Packet may also be referred to as a PDCP PDU for short.

It can be understood that the size of the data block mentioned in the embodiment of the present invention is not limited to the PDCP PDU packet size, and may also be the size of the data block processed by other protocol layers except the PDCP layer; but may also be data block sizes in other protocol stacks.

It should be noted that, the two concepts of data block and data packet mentioned in the embodiments of the present specification may be equivalent.

In this embodiment, the transmission mode of the data block may include network coding transmission or packet repetition (packet duplicate, specifically, CA/DC PDCP packet duplicate) transmission, and therefore, the wireless communication device may dynamically select one of the two transmission modes according to the size of the data block to be transmitted.

In one example, if the size of the data block is larger than the threshold T, it is determined that the transmission mode of the data block is network coding transmission; and/or; and if the size of the data block is smaller than or equal to the threshold T, determining the transmission mode of the data block as data packet repeated transmission.

In this example, the transmission mode of the data block is determined to be data packet retransmission when the size of the data block is exactly equal to the threshold T, but in other examples, the transmission mode of the data block may also be determined to be network coding transmission when the size of the data block is equal to the threshold T.

The threshold T may be agreed upon by the protocol; but also network (pre) configurable. The unit of the threshold T may be the same as the unit of the data block (size), for example, all bits, all bytes, etc.

The embodiment of the present invention here shows a specific implementation manner of S102. Of course, it should be understood that S102 may also be implemented in other manners, for example, when the size of the data block is greater than the threshold T, it is determined that the transmission manner of the data block is data packet retransmission; and/or; when the size of the data block is smaller than or equal to the threshold T, determining the transmission mode of the data block to be data packet repeated transmission network coding transmission and the like; for another example, a transmission mode may be randomly selected from network coding transmission and packet retransmission according to the size of the data block, which is not limited in the embodiment of the present invention.

S104: and transmitting the data block by the determined transmission mode, wherein the transmission mode comprises network coding transmission or data packet repeated transmission.

In one example, if the transmission mode of the data block is determined to be network coded transmission, the wireless communication device may transmit the data block via the network coded transmission mode. The method specifically includes the following steps that a data block is segmented to obtain a plurality of original data sub-blocks; generating a coding matrix; coding according to the multiple original data subblocks and the generated coding matrix to obtain multiple coding subblocks; and transmitting the plurality of encoded sub-blocks.

In another example, if it is determined that the data block is transmitted in a data packet retransmission manner, the wireless communication device may transmit the data block in the data packet retransmission manner. Specifically, for example, the data block is repeatedly transmitted one or more times by different wireless connection entities.

According to the data transmission method provided by the embodiment of the invention, the wireless communication equipment can dynamically select the transmission mode of the data block between network coding transmission and data packet repeated transmission according to the size of the data block, and transmit the data block through the selected transmission mode, so that the flexibility of data transmission is high.

Optionally, as an embodiment, the determining, according to the size of the data block, a transmission mode of the data block in S102 specifically includes: if the size of the data block is larger than the threshold T, determining that the transmission mode of the data block is network coding transmission; and/or; and if the size of the data block is smaller than or equal to the threshold T, determining the transmission mode of the data block as data packet repeated transmission.

The embodiment can minimize the number of Redundant Bits (TRB) of the data block to be transmitted under the conditions of improving the frequency spectrum utilization rate and reducing the time delay, improve the utilization efficiency of time-frequency resources and effectively avoid the waste of the time-frequency resources.

As mentioned herein, "the number of redundant bits of the data block to be transmitted is minimized", which will be described in detail below.

(A)

For the transmission mode of network coding transmission, 1 original data block (PDCP PDU packet, which is a PDU relative to the upper layer of the protocol layer and is treated as SDU in the network coding layer/sublayer) is divided into K original data sub-blocks, and finally N coding sub-blocks are obtained through network coding processing. The N encoded sub-blocks all need to be added with a header, and the header information may include the sequence number of the encoded sub-block, network coding parameters, etc., thereby generating an extra number of bits for transmission (redundancy).

As can be seen from the above description, the larger the value of K (the number of blocks into which a data block is divided during network coding), the larger the number N of coded sub-blocks that need to be transmitted, and the larger the number of transmitted redundant bits; and the higher the position of the 'network coding layer/sublayer' in the protocol stack, the more the number of layers of the header needs to be added, and the more the number of redundancy bits are transmitted.

The network coding layer/sublayer mentioned here is mainly used for performing network coding processing on a data block, and specifically, a protocol layer, that is, a network coding layer, may be newly added in a protocol stack, for example, the network coding layer is added between a PDCP layer and a Radio Link Control (RLC) layer; it is also possible to add a protocol sublayer, i.e. a network coding sublayer, in an existing protocol layer, for example, the network coding sublayer is added in the PDCP layer. The subsequent embodiments will describe the network coding layer/sublayer in detail.

Therefore, for the transmission mode of network coding transmission, there are 2 main factors affecting the number of redundant bits of the transmitted data block, which are:

1) the value of K;

2) the position of the newly added "network coding layer/sublayer" in the protocol stack.

Meanwhile, for the transmission mode of network coding transmission, when the PDCP PDU packet is small, the PDCP PDU packet is coded to form a large number (N) of coded sub-blocks, headers generated after the coded sub-blocks are processed by each protocol layer account for a large proportion, and the total number of redundant bits even exceeds the size of the PDCP PDU packet, so that the advantage of network coding transmission disappears; when the packet size of the PDCP PDU is large, for example, larger than a certain threshold (the threshold T), the advantage of network coding transmission over data packet retransmission is shown.

(II)

For the transmission mode of data packet repeat transmission, under the condition that the PDCP layer has 2 Radio Link Control (RLC) entities, 1 data block (PDCP PDU packet) is transmitted for 2 times, and the position of the PDCP layer in the protocol stack is fixed (if the influence of a newly added network coding layer/sublayer is considered, only a header of a corresponding network coding layer or a sub-header of the network coding sublayer needs to be added, and the overhead is still relatively fixed).

Therefore, for the transmission mode of data packet repeat transmission, the factors influencing the number of transmitted redundant bits are mainly:

1) the size of the original data block (PDCP PDU packet size), because the same PDCP PDU packet is repeatedly transmitted, the repeatedly transmitted PDCP PDU packet belongs to a part of the redundant bits number;

2) after packets of the repeatedly transmitted PDCP PDUs are processed by different protocol layers, headers of different layers are added, and this part of information also belongs to redundant bits.

For the transmission mode of data packet repeat transmission, the generated redundant bit number can increase with the increase of the PDCP PDU.

By combining the analysis of the first step (a) and the analysis of the second step (a), the embodiment of the present invention can control and select a suitable threshold T, and determine that the transmission mode of the data block is network coding transmission when the size of the data block (PDCP PDU packet size) is greater than the threshold T; when the size of the data block is smaller than or equal to the threshold T, the transmission mode of the data block is determined to be data packet repeated transmission, so that the minimum redundant bit number of the data block needing to be transmitted is ensured, and the waste of time-frequency resources is effectively avoided.

For the threshold T mentioned in this embodiment, optionally,

1) the threshold T is configured according to different wireless communication devices; or

2) The threshold T is configured according to the MAC entity and/or the cell group of the wireless communication equipment; or

3) The threshold T is configured according to a logical channel or a logical channel group of the wireless communication device; or

4) The threshold T is configured according to codebook resources of the wireless communication device, which can be specifically referred to as embodiment 4 below.

The above various configuration modes can be implemented by the network device sending RRC signaling.

Optionally, the size of the threshold T is related to the parameter K and the position of the network coding layer/sublayer in the protocol stack; the specific reason is described in the foregoing, and the parameter K is mainly used to indicate the number of parts of the original data block that is cut during the network coding process.

Optionally, the transmitted data block mentioned in the foregoing embodiments further carries indication information, where the indication information is used to indicate a transmission mode of the data block, so that the receiving-end wireless communication device may perform corresponding receiving processing according to the indication information.

For example, the indication information indicates that the transmission mode of the data block is network coding transmission, and the receiving-end wireless communication device may perform decoding processing on the received data according to the network coding mode; for another example, the indication information indicates that the transmission mode of the data block is data packet retransmission, and the receiving-end wireless communication device may receive data in the data packet retransmission mode.

In an embodiment, when a transmission method of a data block is network coding transmission and a wireless communication device for sending the data block configures multiple wireless connections, the transmitting the data block according to the determined transmission method in embodiment 100 includes: coding the data block to obtain a plurality of coded sub-blocks; a plurality of encoded sub-blocks are allocated to the plurality of radio connections for transmission.

Optionally, the allocating the plurality of encoded sub-blocks to a plurality of wireless connections for transmission mentioned in this embodiment includes the following two implementations:

1) evenly distributing the plurality of coding sub-blocks to a plurality of wireless connections for transmission; or

2) And according to the priorities of the plurality of wireless connections, distributing the plurality of coding sub-blocks to the plurality of wireless connections for transmission.

For example, the higher the priority of a radio connection, the greater the number of coded sub-blocks to which the radio connection is allocated; conversely, the lower the priority of a radio connection, the smaller the number of coded sub-blocks to which the radio connection is allocated. The priority of a radio connection is positively correlated with the number of code sub-blocks to which the radio connection is allocated.

The priorities of the multiple radio connections may be pre-agreed, or may be determined according to transmission environments of the multiple radio connections, for example, the priorities of the radio connections are positively correlated with the channel quality of the radio connections.

Optionally, as an embodiment, when the transmission mode of the data block is data packet retransmission, the data block carries indication information, where the indication information is used to indicate to the receiving-end wireless communication device that the transmission mode of the data block is data packet retransmission, and an indication field occupied by the indication information may include at least one of:

1) and a K field in a header/sub-header of the network coding layer/sub-layer, wherein the indication information comprises a specific K value, and the example indicates the transmission mode of the data block to be data packet repeated transmission through the network coding layer/sub-layer.

It should be noted that, the "header/sub-header of the network coding layer/sub-layer" mentioned in the embodiments of the present specification generally refers to a header of the network coding layer or a sub-header of the network coding sub-layer.

This example indicates the data block is transmitted in a data packet repeat transmission manner through an indication field in a header/sub-header of the network coding layer/sub-layer, and the specific K value is, for example, 0 or 1. K here is "specific" because the specific K is different from the number of copies K of the data block divided at the time of the network coding process.

2) N field in the header/sub-header of the network coding layer/sub-layer, and the indication information includes a specific N value, which indicates the transmission mode of the data block as data packet repeat transmission through the network coding layer/sub-layer.

This example indicates the data block is transmitted in a data packet repeat transmission manner through an indication field in a header/sub-header of the network coding layer/sub-layer, and the specific N value is, for example, 0 or 1. The N is "specific" because the specific N is different from the number N of encoded sub-blocks in the network encoding process.

3) A new definition field in the header/sub-header of the network coding layer/sub-layer indicates, by the network coding layer/sub-layer, the way in which the data block is transmitted as a data packet repeat transmission.

This example indicates the transmission mode of the data block as a data packet repeat transmission through an indication field newly defined in the header/sub-header of the network coding layer/sub-layer.

4) A reserved field or a new definition field in a lower layer header of the network coding layer/sublayer, which indicates the transmission mode of the data block for data packet repeat transmission through the lower layer of the network coding layer/sublayer.

It should be noted that, when the network coding sublayer exists as a sublayer in the protocol stack, the lower layer of the network coding sublayer mentioned here may be specifically a protocol layer next to the protocol layer where the network coding sublayer is located. Specifically, for example, the network coding sublayer is a sublayer of the PDCP layer, the lower layer of the PDCP layer is the RLC layer, and the embodiment indicates the transmission mode of the data block to be data packet repeat transmission through an indication field in a header of the RLC layer.

When the network coding layer exists as an independent protocol layer in the protocol stack, the lower layer of the network coding layer mentioned here may be specifically a next adjacent protocol layer of the network coding layer.

Optionally, in an example, the indication field occupied by the indication information is a reserved field or a new definition field in a lower layer header of the network coding layer/sub-layer, that is, the above-mentioned manner 4). In this case, the protocol layer where the upper layer of the network coding layer or the network coding sublayer is located is further configured to indicate, to the lower layer of the network coding layer/sublayer, that the transmission mode of the data block is data packet retransmission.

The embodiment can be specifically implemented by using an inter-layer indication manner, which is convenient for a lower layer of a network coding layer/sub-layer to add indication information in a header thereof, where the indication information indicates that a transmission manner of a data block is data packet repeat transmission.

Specifically, for example, the network coding layer is an independent protocol layer in the protocol stack, the upper layer of the network coding layer is a PDCP layer, the lower layer of the network coding layer is an RLC layer, and the indication field occupied by the indication information is a reserved field or a new defined field in the header of the RLC layer. In this case, the PDCP layer may indicate a transmission scheme of the data block to the RLC layer as a packet retransmission scheme by means of an inter-layer indication.

For another example, the network coding sublayer exists as a sublayer in the protocol stack, the protocol layer where the network coding sublayer is located is a PDCP layer, the lower layer of the PDCP layer is an RLC layer, and the indication field occupied by the indication information is a reserved field or a new defined field in the header of the RLC layer. In this case, the PDCP layer may indicate a transmission scheme of the data block to the RLC layer as a packet retransmission scheme by means of an inter-layer indication.

Optionally, as an embodiment, when the transmission mode of the data block is data packet repeat transmission, and the wireless communication device may further omit adding (i.e., not adding) the header/sub-header of the network coding layer/sub-layer when performing transmission processing on the data block, so that the indication information is further used to indicate to the receiving-end wireless communication device that the data block does not include the header/sub-header of the network coding layer/sub-layer.

Optionally, as an embodiment, the indication information is further used to indicate the receiving device to perform preset processing on the data block. The receiving wireless communication device in this case processes the received data in a manner that does not have a network coding layer (or network coding sublayer) header (or sub-header).

Optionally, as an embodiment, the indication field occupied by the indication information is an indication field in a header/sub-header of a network coding layer/sub-layer, that is, any one of the above modes 1) to 3). In this case, the indication information is also used to instruct the receiving device to perform the preset processing on the data block. For example, the transmission mode of the data block is data packet repeat transmission, and the receiving-end wireless communication device performs data processing on the header (or sub-header) of the network coding layer (or sub-layer) in which some fields are omitted, in a manner that both the transmitting and receiving parties agree in advance. In other embodiments, the data block is transmitted by network coding, and the receiving wireless communication device processes the data according to the standard header (or sub-header) of the network coding layer (or sub-layer).

It should be noted that the indication information described in the foregoing embodiments is mainly used to indicate that the transmission mode of the data block is data packet retransmission. When the transmission mode of the data block is network coding transmission, an implementation similar to the above-mentioned mode 4) may be adopted, that is, the transmission mode of the data block is indicated to the receiving-end wireless communication device as network coding transmission through a reserved field or a new definition field in a lower layer header of a network coding layer/sublayer.

To describe the data transmission method provided in the above embodiments of the present invention in detail, the following description will be made with reference to several specific embodiments.

Example 1

This embodiment 1 provides a scheme for dynamically selecting a transmission scheme between "network coding transmission" and "carrier aggregation CA/dual-connection DC packet duplicate transmission (i.e., the aforementioned packet duplicate transmission)". This embodiment determines whether to transmit with network coding or packet retransmission according to the original data block size, and at the same time gives an associated indication that "network coding transmission" is not used (i.e. with packet retransmission).

(1) This embodiment has signaled a selection threshold T for the configuration data block size (PDCP PDU packet size) in the same year.

(2) And (4) selection strategy of transmission modes.

a) If network coding is used, it is indicated (to the receiving end terminal device) that "network coded transmission" is used.

If the wireless communication device is configured with multiple wireless connections (dual or multiple connections), then the N encoded sub-blocks obtained after the network encoding process should be allocated to these multiple wireless connections for transmission.

b) If data packet repeat transmission is used, it indicates that "network coding" is not used.

The implementation of this embodiment 1 will be described in detail below:

1. the selection threshold T of the packet size of the PDCP PDU is defined by a protocol or (pre) configured by a network, and the unit of the threshold T may be a bit (bit) or a byte (byte).

(a) The threshold value T may be configured per wireless communication device; the MAC entity and/or the cell group of the wireless communication device can also be configured; or each Logical Channel (LCH) or Logical Channel Group (LCG) may be configured; it may also be configured according to codebook resources of the wireless communication device.

(b) The size of the threshold T is related to the value of the number of divided pieces K of the original data block during the network coding process and the position of the "network coding layer/sublayer" in the protocol stack.

(c) The size of the T is configured explicitly or implicitly by protocol definition or network (pre) configuration.

As an example of explicit configuration, a value corresponding to T may be directly given; or threshold value numbers are preset, and different numbers indicate different thresholds T.

2. The wireless communication device selects a transmission mode.

2.1 when the PDU packet size to be transmitted is larger than T, selecting network coding for transmission.

At this time, the PDU packet needs to be processed in the "network coding" process (in the "network coding layer" or in the extension sub-layer (i.e. network coding sub-layer) of other layers), and after the processing, a header of the "network coding layer" or a sub-header of the "network coding sub-layer" needs to be added to each coding sub-block, where the network coding parameter contained in the header or sub-header indicates that the "network coding transmission" is used.

If the protocol definition or the network (pre-) configuration is applied to multiple radio connections of the wireless communication device, the N encoded sub-blocks obtained after network encoding can be allocated to different radio connections for transmission. The wireless connection may be a connection between the wireless communication device and a serving cell, or a connection between the wireless communication device and a cell group (MCG or SCG).

The coding sub-block allocation can be, but is not limited to, the following two ways:

the coded sub-blocks are equally distributed among different radio connections;

the manner of allocating the encoded sub-blocks may be to unevenly allocate the encoded packets to different radio connections according to the priority of the radio connection according to the current transmission environment.

2.2 when the PDU packet size required to be transmitted is less than or equal to T, the CA/DC packet duplicate is selected for transmission.

At this time, the PDU packet does not perform the "network coding" process.

2.2.1 higher layer protocol layers ("network coding layers" upper layers) indicate to the lower layer protocol layers that "no network coding is done".

i. The higher layer protocol layer performs an inter-layer indication of "network coding layer" (or a protocol layer containing "network coding layer sub-layer") and the next layer (assuming its name is L layer) indicating "no network coding.

Or:

the high-level protocol layer firstly indicates the network coding layer (or the protocol layer containing the network coding layer sub-layer) between layers, and then indicates the network coding layer (or the protocol layer containing the network coding layer sub-layer) to indicate the L layer between layers, which indicates that the network coding is not carried out.

At the moment, the data of the higher protocol layer is directly transmitted to the L layer for processing without network coding; redefining a reserved field (reserved field) in the L-layer header as an indication field of "unused network coding"; or a new field (new field) is defined to indicate "no network coding used"; if the value of the field takes "0", it indicates that no network coding is performed.

The receiving wireless communication device receives an indication of "no network coding" in the lower protocol L layer header in this case, and processes the received data in such a way that there is no network coding layer (or network coding sublayer) header (or sub-header).

2.2.2 if "no network coding" is indicated at a lower protocol layer (the "network coding layer" next layer) (i.e., an indication of "no network coding" is made in the header of the lower protocol layer), then no network coded header (or sub-header) may be added to the transmitted data; the receiving wireless communication device receives an indication of "no network coding" in the lower protocol layer header in this case, and processes the received data in such a way that there is no network coding layer (or network coding sublayer) header (or sub-header).

i. Redefining a reserved field (reserved field) in a lower protocol layer header as an indication field of 'unused network coding'; or a new field (new field) is defined to indicate "no network coding used"; if the value of the field takes "0", it indicates that no network coding is performed.

In one example, a network coding layer is placed below the PDCP layer and above the RLC layer, and a new field may be introduced in the RLC layer to indicate this.

2.2.2 if "no network coding" is indicated at the network coding layer, then "no network coding" may be indicated directly or indirectly with a field in the header (or sub-header) of the network coding layer (or the network coding layer as a sub-layer), when some fields of the header (or sub-header) of the network coding layer (or sub-layer) may not be present (e.g., number of coding sub-blocks, number of original data blocks, etc.); when receiving the indication that the network coding layer (sub-layer) has no network coding, the receiving end wireless communication device processes the data of the header (or sub-header) of the network coding layer (sub-layer) with certain domains omitted in a mode agreed by the transmitting and receiving parties in advance; and when it is determined that the network coding is performed, data processing is performed in a header (or sub-header) of a standard network coding layer (or sub-layer).

i. The header/sub-header of the network coding layer/sub-layer is indicated with a special value of K (e.g., K0 or K1); the special value K indicates that the original data block is not to be partitioned, i.e. indirectly indicates that "network coding" is not used;

the header/sub-header of the network coding layer/sub-layer is indicated with a special value of N (e.g., N-0 or N-1); the special N value indicates that the original data block is not partitioned, i.e. indirectly indicates that "network coding" is not used;

a new field (new field) is used in the header/sub-header of the network coding layer/sub-layer to indicate that no network coding is used; if the value of the field takes "0", it indicates that no network coding is performed.

It should be noted that the method for data transmission described in the embodiments of the present invention may be used in an IAB node wireless loop; and data transmission between the terminal equipment and the service base station and between the terminal equipment and sidelink wireless connection.

Example 2

On the basis of embodiment 1, embodiment 2 may be a specific implementation manner of embodiment 1.

As shown in fig. 2, in the related art, the 3GPP purposely defines a new Backhaul Adaptation Protocol (BAP) layer below the PDCP layer above the RLC layer to control the delivery of service flows in the IAB network. The functions of the BAP layer mainly include routing and bearer mapping, etc.

In the embodiment of the present invention, a network coding layer (NWC layer) is added in a protocol stack, as shown in fig. 2, the NWC layer may be used as an independent layer between a PDCP layer and a BAP layer in the protocol stack, and optionally, the NWC layer may also be used as an extension sublayer of the PDCP layer or the BAP layer.

The data plane protocol stack shown in fig. 2 includes, in order from top to bottom:

a Service Data Adaptation Protocol (SDAP) layer;

a PDCP layer;

a Network Coding (NWC) layer;

a BAP layer;

an RLC layer;

a Media Access Control (MAC) layer;

physical (PHY) layer.

In this embodiment, the threshold T is configured for each LCH in bytes (byte).

In this embodiment, the network device explicitly configures the size of the threshold T, indicating the value of the threshold T.

In this embodiment, if the PDU packet size > threshold T, the network coding is selected for transmission.

At this time, the PDU packet needs to be processed by the "network coding layer", and after the processing, a header of the network coding layer needs to be added to each coding sub-block.

In this embodiment, the wireless communication device configures 2 wireless connections, and a coding sub-block obtained after network coding in a network coding layer (or a network coding sub-layer) is averagely allocated to 2 wireless connections for transmission, where a specific flowchart is shown in fig. 3, where an SDAP layer is mainly used for QoS stream processing; the PDCP layer is mainly used for robust header compression protocol processing and security processing, and can also be used for selecting a transmission mode of a data block; the NWC layer is mainly used for partitioning and coding the original data block; the BAP layer is mainly used for routing and multiple RLC backhaul channels.

Example 3

On the basis of embodiment 1, embodiment 3 may be a specific implementation manner of embodiment 1.

This embodiment performs the configuration of the threshold T between network coding and packet retransmission by LCH.

In this embodiment, the threshold T is configured for each LCH in bytes (byte).

In this embodiment, if the PDU packet size to be transmitted is not greater than T, the transmission mode of the packet retransmission is selected.

At this time, the PDU packet does not perform network coding processing; and needs to indicate "no network coding"; the indication mode can be the following modes:

i. as shown in fig. 4, K in the header of the network coding layer is 1; that is, the bit value of the K value in fig. 4 is "0001".

As shown in fig. 5, a new field (NWC) is used in the header of the network coding layer to indicate that no network coding is used, and when the value of NWC is "0", it indicates that no network coding is performed.

Redefining a reserved field in a BAP layer header to indicate "unused network coding"; as shown in fig. 6, the 1 st R field shown in fig. 6 is redefined, and when the value of the field takes "0", it means that network coding is not performed.

It should be noted that, in the above manner, the way of using the R field redefinition to indicate whether the network coding is used may have good compatibility. Alternatively, 1bit may be added in the PDCP/BWP/RLC layer to indicate whether network coding is performed.

It should be noted that, although the above example uses a layer specific to the IAB network, such as the BAP layer, the application scope of the solution is not limited to the IAB network.

Example 4

On the basis of embodiment 1, embodiment 4 may be a specific implementation manner of embodiment 1.

In this embodiment, the threshold T may be one of configuration parameters of a "network coding layer" (or a "network coding sublayer").

The handover threshold T may be determined when a protocol definition or network (pre) configures an LCH to use a certain "network coding configuration", which may specifically be codebook resources of the wireless communication device.

Example 5

On the basis of embodiment 1, embodiment 5 may be a specific implementation manner of embodiment 1.

In this embodiment, the NWC layer is located between the PDCP layer and the RLC layer, and the PDCP layer sends an "network coding not performed" instruction through an inter-layer instruction, and when network coding transmission is not required:

(1) the PDCP layer respectively carries out interlayer indication to a network coding layer and an RLC layer, which indicates that network coding is not carried out;

(2) at this time, the "network coding layer" receives an instruction, does not encode a data packet (abbreviated as data in some places), and transfers the data to the next "RLC layer" of the layer;

(3) the RLC receives the indication from the PDCP layer, processes the data passed through by the "network coding layer", and indicates "no network coding" in the RLC header.

(4) The receiving end wireless communication equipment receives the corresponding SDU on the RLC layer, analyzes the indication information in the RLC header, and when the indication information of 'network coding is not performed', the data processed on the RLC layer is transmitted to the PDCP layer.

The data transmission (mainly transmission) method according to the embodiment of the present invention is described in detail above with reference to fig. 1 to 6. A data transmission (mainly, reception) method according to another embodiment of the present invention will be described in detail below with reference to fig. 7. It is to be understood that this embodiment corresponds to the description on the wireless communication apparatus side in the foregoing method, and the related description is appropriately omitted to avoid redundancy.

Fig. 7 is a schematic flow chart of a data transmission method according to an embodiment of the present invention, which can be applied to a wireless communication device. As shown in fig. 7, the method 700 includes:

s702: and receiving a data block, wherein the data block carries indication information.

S704: and determining a transmission mode of the data block according to the indication information, wherein the transmission mode comprises network coding transmission or data packet repeated transmission.

S706: and processing the data block according to the transmission mode.

Optionally, as an embodiment, the step may be to perform, in the case of network coded transmission, a decoding operation corresponding to the network coded transmission on the data block.

Optionally, as an embodiment, this step may be to determine whether the data block that has been received is repeated in the case of repeated transmission of a data packet:

if the received data block is repeated, discarding the repeated data block;

if the data block that has been received is not repeated, the data block is retained.

In this step, if the transmission mode is packet retransmission, the same data block is usually repeatedly sent, so that the receiving-end wireless communication device may discard the repeatedly received data block in the following under the condition that the receiving-end wireless communication device has received the data block; if the data block is received for the first time, the data block can be reserved and passed to other protocol layers in the protocol stack for processing.

Optionally, as an embodiment, the transmission mode of the data block is data packet repeat transmission, and the indication field occupied by the indication information includes at least one of:

a K field in a header/subheader of a network coding layer/sublayer, the indication information including a specific K value;

an N field in a header/subheader of a network coding layer/sublayer, the indication information including a specific N value;

a new definition field in the header/sub-header of the network coding layer/sub-layer;

reserved fields or new definition fields in the lower layer header of the network coding layer/sublayer.

Optionally, as an embodiment, the indication information is further used to indicate that the data block does not include a header/sub-header of the network coding layer/sub-layer.

The data transmission method according to the embodiment of the present invention is described in detail above with reference to fig. 1 to 7. A wireless communication device according to an embodiment of the present invention will be described in detail below with reference to fig. 8.

Fig. 8 is a schematic structural diagram of a wireless communication device according to an embodiment of the present invention, where the wireless communication device may be a terminal device or a network device. As shown in fig. 8, the wireless communication apparatus 800 includes:

a determining module 802, configured to determine a transmission mode of a data block according to the size of the data block;

a transmission module 804, configured to transmit the data block by the transmission manner;

the transmission mode comprises network coding transmission or data packet repeated transmission.

Optionally, as an embodiment, the determining module 802 may be configured to:

if the size of the data block is larger than a threshold T, determining that the transmission mode of the data block is network coding transmission; and/or

And if the size of the data block is smaller than or equal to the threshold T, determining that the transmission mode of the data block is data packet repeated transmission.

Optionally, as an embodiment, the data block further carries indication information, where the indication information is used to indicate a transmission mode of the data block.

Optionally, as an embodiment, the wireless communication device 800 is configured with a plurality of wireless connections, and the transmission mode of the data block is network coding transmission; the transmission module 804 may be configured to:

coding the data block to obtain a plurality of coded sub-blocks;

and allocating a plurality of the coding sub-blocks to a plurality of the wireless connections for transmission.

Optionally, as an embodiment, the transmission module 804 may be configured to:

equally allocating a plurality of the encoded sub-blocks to a plurality of the wireless connections for transmission; or

And according to the priorities of the plurality of wireless connections, distributing the plurality of coding sub-blocks to the plurality of wireless connections for transmission.

Optionally, as an embodiment, the indication field occupied by the indication information is a reserved field or a new definition field in a lower layer header of a network coding layer/sublayer; the transmission module 804 may be configured to:

the upper layer of the network coding layer or the protocol layer where the network coding sublayer is located is further configured to indicate the transmission mode of the data block to the lower layer of the network coding layer/sublayer as data packet repeat transmission.

Optionally, as an embodiment, the indication information is further used to indicate the receiving device to perform preset processing on the data block.

Optionally, as an embodiment, the indication field occupied by the indication information is an indication field in a header/sub-header of a network coding layer/sub-layer;

the indication information is further used for indicating the receiving device to perform preset processing on the data block.

Alternatively, the processor may, as an embodiment,

the threshold T is configured according to the wireless communication device;

the threshold T is configured according to a Media Access Control (MAC) entity and/or a cell group of the wireless communication equipment;

the threshold T is configured according to a logical channel or a logical channel group of the wireless communication device; or

The threshold T is configured according to codebook resources of the wireless communication device.

Alternatively, the processor may, as an embodiment,

the size of the threshold T is related to the parameter K and the position of the network coding layer/sublayer in the protocol stack;

the parameter K is used for representing the number of the data blocks to be cut in the network coding process.

The wireless communication device 800 according to the embodiment of the present invention may refer to the flow corresponding to the method 100 according to the embodiment of the present invention, and each unit/module and the other operations and/or functions described above in the wireless communication device 800 are respectively for implementing the corresponding flow in the method 100 and achieving the same or equivalent technical effects, and are not described herein again for brevity.

Fig. 9 is a schematic structural diagram of a wireless communication device according to another embodiment of the present invention, where the wireless communication device may be a terminal device or a network device. As illustrated in fig. 9, the wireless communication device 900 includes:

a transmission module 902, configured to receive a data block, where the data block carries indication information;

a determining module 904, configured to determine a transmission manner of the data block according to the indication information;

wherein, the transmission mode comprises network coding transmission or data packet repeated transmission;

a processing module 906, configured to process the data block according to the transmission manner.

Optionally, as an embodiment, the processing module 906 may be configured to, in a case that the transmission mode is network coded transmission, perform a decoding operation corresponding to the network coded transmission on the data block.

Optionally, as an embodiment, the processing module 906 may be configured to, in a case that the transmission mode is data packet retransmission, determine whether the received data block is a duplicate: discarding the data block if the data block that has been received is duplicate; if the data block that has been received is not repeated, the data block is retained.

The wireless communication device 900 according to the embodiment of the present invention may refer to the flow corresponding to the method 700 according to the embodiment of the present invention, and each unit/module and the other operations and/or functions described above in the wireless communication device 900 are respectively for implementing the corresponding flow in the method 700 and achieving the same or equivalent technical effects, and are not described herein again for brevity.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts in the embodiments are referred to each other. For the apparatus embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

Fig. 10 is a block diagram of a terminal device of another embodiment of the present invention. The terminal device 1000 shown in fig. 10 includes: at least one processor 1001, memory 1002, at least one network interface 1004, and a user interface 1003. The various components in terminal device 1000 are coupled together by a bus system 1005. It is understood that bus system 1005 is used to enable communications among the components connected. The bus system 1005 includes a power bus, a control bus, and a status signal bus, in addition to a data bus. But for the sake of clarity the various busses are labeled in figure 10 as the bus system 1005.

The user interface 1003 may include, among other things, a display, a keyboard, a pointing device (e.g., a mouse, trackball), a touch pad, or a touch screen.

It is to be understood that the memory 1002 in embodiments of the present invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (ddr Data Rate SDRAM, ddr SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 1002 of the subject systems and methods is intended to comprise, without being limited to, these and any other suitable types of memory.

In some embodiments, memory 1002 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof: an operating system 10021 and applications 10022.

The operating system 10021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application 10022 includes various applications, such as a Media Player (Media Player), a Browser (Browser), and the like, for implementing various application services. The program implementing the method according to the embodiment of the present invention may be included in the application program 10022.

In this embodiment of the present invention, the terminal device 1000 further includes: a computer program stored on the memory 1002 and executable on the processor 1001, the computer program, when executed by the processor 1001, implementing the steps of any one of the

method embodiments

100 and 700 as follows.

The method disclosed by the embodiment of the invention can be applied to the processor 1001 or can be implemented by the processor 1001. The processor 1001 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 1001. The Processor 1001 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may reside in ram, flash memory, rom, prom, or eprom, registers, among other computer-readable storage media known in the art. The computer readable storage medium is located in the memory 1002, and the processor 1001 reads the information in the memory 1002 and performs the steps of the method in combination with the hardware. In particular, the computer-readable storage medium has stored thereon a computer program which, when executed by the processor 1001, carries out the steps of any one of the

method embodiments

100 and 700 as described above.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.

For a software implementation, the techniques described in this disclosure may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described in this disclosure. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

The terminal device 1000 can implement each process implemented by the wireless communication device in the foregoing embodiments, and can achieve the same or equivalent technical effects, and for avoiding repetition, details are not described here.

Referring to fig. 11, fig. 11 is a structural diagram of a network device applied in the embodiment of the present invention, which can implement each step of any one of

method embodiments

100 and 700, and achieve the same effect. As shown in fig. 11, the network device 1100 includes: a processor 1101, a transceiver 1102, a memory 1103, and a bus interface, wherein:

in this embodiment of the present invention, the network device 1100 further includes: a computer program stored on the memory 1103 and executable on the processor 1101, the computer program, when executed by the processor 1101, implementing the steps of any one of the

method embodiments

100 and 700.

In fig. 11, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1101, and various circuits, represented by memory 1103, 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 1102 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 1101 is responsible for managing the bus architecture and general processing, and the memory 1103 may store data used by the processor 1101 in performing operations.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of any one of the

method embodiments

100 and 700, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method of data transmission, the method comprising:

determining a transmission mode of a data block according to the size of the data block;

transmitting the data block by the transmission mode;

2. The method of claim 1, wherein the determining the transmission mode of the data block according to the size of the data block comprises:

3. The method according to claim 1 or 2, wherein the data block further carries indication information, and the indication information is used for indicating a transmission mode of the data block.

4. The method of claim 1, wherein a wireless communication device for transmitting the data block is configured with a plurality of wireless connections, and the data block is transmitted by network coding; wherein the transmitting the data block by the transmission manner includes:

coding the data block to obtain a plurality of coded sub-blocks;

5. The method of claim 4, wherein the allocating the plurality of encoded sub-blocks to the plurality of wireless connections for transmission comprises:

6. The method according to claim 3, wherein the data block is transmitted in a manner of data packet retransmission, and the indication field occupied by the indication information includes at least one of:

7. The method according to claim 6, wherein the indication field occupied by the indication information is a reserved field or a new definition field in a lower layer header of a network coding layer/sub-layer; wherein the content of the first and second substances,

8. The method of claim 7, wherein the indication information is further used for indicating that the data block does not include a header/sub-header of the network coding layer/sub-layer.

9. The method of claim 8, wherein the indication information is further used for instructing a receiving device to perform a predetermined process on the data block.

10. The method according to claim 3, wherein the indication field occupied by the indication information is an indication field in a header/sub-header of a network coding layer/sub-layer;

11. The method of claim 2,

the threshold T is configured according to the wireless communication device;

12. The method of claim 2,

13. A method of data transmission, the method comprising:

receiving a data block, wherein the data block carries indication information;

determining a transmission mode of the data block according to the indication information; wherein, the transmission mode comprises network coding transmission or data packet repeated transmission;

and processing the data block according to the transmission mode.

14. The method of claim 13, wherein the processing the data block according to the transmission mode comprises:

and if the transmission mode is network coding transmission, performing decoding operation corresponding to the network coding transmission on the data block.

15. The method of claim 13, wherein the processing the data block according to the transmission mode comprises:

and under the condition that the transmission mode is data packet repeated transmission, determining whether the received data block is repeated:

discarding the data block if the data block that has been received is duplicate;

16. A wireless communication device, comprising:

the determining module is used for determining the transmission mode of the data block according to the size of the data block;

the transmission module is used for transmitting the data block through the transmission mode;

17. A wireless communication device, comprising:

the transmission module is used for receiving a data block, and the data block carries indication information;

a determining module, configured to determine a transmission mode of the data block according to the indication information; wherein, the transmission mode comprises network coding transmission or data packet repeated transmission;

and the processing module is used for processing the data block according to the transmission mode.

18. A wireless communication device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, implements a data transmission method as claimed in any one of claims 1 to 15.

19. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the data transmission method according to any one of claims 1 to 15.