CN111049628A

CN111049628A - Data transmission method and communication device

Info

Publication number: CN111049628A
Application number: CN201811191666.4A
Authority: CN
Inventors: 刘永
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-10-12
Filing date: 2018-10-12
Publication date: 2020-04-21
Anticipated expiration: 2038-10-12
Also published as: WO2020073991A1; CN114866211A; CN111049628B

Abstract

The application provides a data transmission method and a communication device, which can reduce the overhead of DMRS and improve the spectrum efficiency. The method comprises the following steps: the method comprises the steps that a sending end and a receiving end determine the corresponding relation between at least one demodulation reference signal (DMRS) port to be scheduled and at least one resource unit according to a mapping rule, wherein the mapping rule is used for indicating the corresponding relation between N DMRS ports supported by a system to the maximum and the resource unit, and one-time complete mapping of the N DMRS ports exists on M resource units; the method comprises the steps that a sending end sends data to be transmitted and a DMRS on a data channel according to the corresponding relation between at least one demodulation reference signal DMRS port and at least one resource unit, and a receiving end receives the data channel and demodulates the data to be transmitted according to the corresponding relation between the at least one demodulation reference signal DMRS port and the at least one resource unit.

Description

Data transmission method and communication device

Technical Field

The present application relates to the field of communications, and more particularly, to a data transmission method and a communication apparatus.

Background

In New Radio (NR), a demodulation reference signal (DMRS) is used for demodulation of a Physical Downlink Shared Channel (PDSCH).

In the existing protocol, DMRS supports at most 12 orthogonal ports, in other words, the existing system can simultaneously transmit at most 12 orthogonal data streams. However, The spectrum efficiency of 12-port data transmission is far from meeting various NR scenarios, such as a new NR Wireless broadband To The home (WTTx) scenario requiring up To 32/48/64 streaming transmission, an unmanned aerial vehicle real-time transmission scenario requiring a rate greater than 300Mbps, an automatic driving scenario, and The like. Obviously, increasing the number of DMRS orthogonal ports is the most direct solution to increase Spectral Efficiency (SE). However, DMRS design rules specified by existing protocols may become bottlenecks in further improvement of spectral efficiency. For example, when 32/48/64 ports are implemented according to the existing DMRS design rule, the overhead is increased dramatically, and 32/48/64 ports cannot be implemented.

Therefore, DMRS pilot design needs to be reconsidered for NR scenarios with various high spectral efficiency requirements.

Disclosure of Invention

The present application provides a data transmission method and a communication apparatus, which can reduce the overhead of DMRS on a single physical resource block (PRB defined in LTE) and improve spectral efficiency by performing complete mapping of DMRS ports supported by the most systems on a plurality of resource elements (e.g., a plurality of slots), instead of mapping each DMRS port on each PRB defined in LTE.

In a first aspect, a data transmission method is provided, including: a sending end determines a corresponding relation between at least one demodulation reference signal (DMRS) port to be scheduled and at least one resource unit according to a mapping rule, wherein the mapping rule is used for indicating the corresponding relation between N DMRS ports and the resource unit, N is the number of the DMRS ports supported by the system to the maximum, M resource units have one complete mapping of the N DMRS ports, N is not less than 1, M is not less than 2, both N and M are integers, and the at least one DMRS port belongs to the N DMRS ports;

and the sending end sends the data to be transmitted and the DMRS on a data channel according to the corresponding relation between the at least one demodulation reference signal DMRS port and the at least one resource unit.

Optionally, the at least one resource element may be a resource element used for mapping the DMRS port, or may be a resource element scheduled by the network device.

The resource elements used for mapping the DMRS ports are part or all of all resource elements included in the system, specifically, may be part or all of the resource elements scheduled by the network device, and may also include other resource elements except the resource elements scheduled by the network device in all the resource elements included in the system.

Accordingly, the mapping rule may indicate a correspondence between the N DMRS ports and all resource elements included in the system, or may indicate a correspondence between the N DMRS ports and resource elements used for mapping the DMRS ports.

The time-frequency resource formed by the M resource elements is different from the PRB defined in LTE, that is, the mapping rule in this application indicates that each DMRS port is not mapped in each scheduling element (i.e., PRB defined in LTE).

Alternatively, the resource unit in the present application may have the following two definitions:

define one

The resource unit in the present application is composed of 12 × Y subcarriers in succession in the frequency domain and X time slots in the time domain. Wherein X and Y can be any integer greater than or equal to 1.

Accordingly, the M resource units are composed of 12 × Y subcarriers in the frequency domain and X time slots in the time domain, or the M resource units are composed of 12 × Y subcarriers in the frequency domain and M × X time slots in the time domain. Further, 12 × M × Y subcarriers constituting the M resource elements are consecutive in a frequency domain, or M × X slots constituting the M resource elements are consecutive in a time domain.

The timeslot may be a Transmission Time Interval (TTI) in LTE, a symbol-level short TTI, a short TTI with a large subcarrier interval in a high-frequency system, a slot in NR, a mini-slot, or the like, which is not limited in the present application. Alternatively, one slot in the NR may be composed of 12 or 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols.

The PRB defined in NR includes 12 subcarriers consecutive in the frequency domain. Therefore, it can be understood that the resource unit in the present application may be composed of Y PRBs and X slots. Accordingly, the M resource elements are composed of M × Y PRBs and X slots, or the M resource elements are composed of Y PRBs and M × X slots.

When the M resource elements are formed of M × Y PRBs and X slots, if X is 1 and Y is 1, the index of the PRB is used as the index of the resource element corresponding to the PRB. Similarly, in the case where the M resource elements are composed of Y PRBs and M × X slots, if X is 1 and Y is 1, the index of the slot is used as the index of the resource element corresponding to the slot. If at least one of X and Y is not 1, the resource unit index includes two parts, namely an index in the time domain and an index in the frequency domain, where the index in the time domain of the resource unit is an index of a timeslot corresponding to the resource unit, and the index in the frequency domain of the resource unit is an index of a PRB corresponding to the resource unit.

Definition two

The resource unit in the application is composed of 12 × W subcarriers in succession in the frequency domain and N _ s × Q symbols in the time domain. Wherein N _ s is at least one scheduling symbol number corresponding to the non-time slot scheduling scene. Wherein W and Q can be any integer greater than or equal to 1.

Accordingly, the M resource elements are composed of 12 × M × W subcarriers and N _ s × Q symbols in the time domain, or the M resource elements are composed of 12 × W subcarriers in the frequency domain and N _ s × Q symbols in the time domain. Further, 12 × M × W subcarriers constituting the M resource elements are consecutive in a frequency domain, or N _ s × Q × M symbols constituting the M resource elements are consecutive in a time domain.

At least one scheduling symbol number N _ s corresponding to the non-time slot scheduling scenario may be determined according to non-time slot scheduling time domain resource configuration information, which is not limited in the present application. Alternatively, one ns in NR may consist of 2,4 or 7 OFDM symbols.

In the present application, when the M resource elements are composed of 12 × M × W subcarriers and N _ s × Q symbols in the time domain, if W is 1 and Q is 1, the index of the PRB is used as the index of the resource element corresponding to the PRB. Similarly, in the case where the M resource elements are composed of 12 × W subcarriers and N _ s × Q × M symbols in the time domain, if W is 1 and Q is 1, the index of the scheduling granularity composed of N _ s symbols is used as the index of the resource element corresponding to the scheduling granularity. If at least one of W and Q is not 1, the resource unit index includes two parts, namely an index in the time domain and an index in the frequency domain, where the index in the time domain of the resource unit is the index of the scheduling granularity corresponding to the resource unit, and the index in the frequency domain of the resource unit is the index of the PRB corresponding to the resource unit.

According to the data transmission method, the N DMRS ports are completely mapped on the M resource elements, instead of mapping all the DMRS ports on each PRB (PRB defined in LTE), so that the cost of the DMRS on a single PRB (PRB defined in LTE) can be reduced, and the spectrum efficiency is improved.

With reference to the first aspect, in a possible implementation manner, any DMRS port of the N DMRS ports uniquely corresponds to one resource element of the M resource elements. Thereby enabling further spectral efficiency improvement.

With reference to the first aspect, in a possible implementation manner, the numbers of DMRS ports corresponding to at least two resource elements in the M resource elements are different, or the numbers of DMRS ports corresponding to any two resource elements in the M resource elements are the same; and/or the presence of a gas in the gas,

the number of Resource Elements (REs) occupied by at least two of the N DMRS ports is different, or the number of REs occupied by any two of the N DMRS ports is the same; and/or

The total number of REs used for mapping the DMRS ports in at least two of the M resource elements is different, or the total number of REs used for mapping the DMRS ports in any two of the M resource elements is the same.

With reference to the first aspect, in a possible implementation manner, the M resource units are consecutive in a frequency domain or a time domain.

Therefore, the mapping rule of the DMRS port and the resource unit is simpler, and the processing complexity of the sending end and the receiving end can be reduced.

With reference to the first aspect, in a possible implementation manner, each of the M resource elements corresponds to at least one DMRS port of the N DMRS ports.

Optionally, the correspondence between the N DMRS ports and the resource elements is any one of the following:

the DMRS port with index i in the N DMRS ports corresponds to a resource unit with index j + k M, i and j meet the condition that i% M is j, and% represents a remainder operator; alternatively, the first and second electrodes may be,

in M resource elements with indexes from k M to k M + M-1, the index of any DMRS port corresponding to the resource element with a smaller index is smaller than the index of any DMRS port corresponding to the resource element with a larger index, or the index of any DMRS port corresponding to the resource element with a smaller index is larger than the index of any DMRS port corresponding to the resource element with a larger index. In other words, for any M resource elements with N DMRS ports mapped completely, the index of any DMRS port corresponding to a resource element with a smaller index is smaller than the index of any DMRS port corresponding to a resource element with a larger index, or the index of any DMRS port corresponding to a resource element with a smaller index is larger than the index of any DMRS port corresponding to a resource element with a larger index;

wherein i is 0,1, … …, N-1, k is 0,1,2, … …, j is an integer and j is ∈ [0,1, … …, M-1 ].

Optionally, in this application, the maximum value of k may be:

alternatively, the first and second electrodes may be,

or the maximum value of k is a preset value, and the preset value can be an empirical value and the like.

With reference to the first aspect, in a possible implementation manner, all of the N DMRS ports are mapped to a part of the M resource elements.

Optionally, of M resource elements with indices k × M to k × M + M-1, resource elements with indices of odd numbers or even numbers map the N DMRS ports, or M-P resource elements with smaller indices or larger indices map the N DMRS ports, P is greater than or equal to 1 and less than or equal to M-1, and P is an integer, k is 0,1,2, … ….

In other words, for any M resource elements with N DMRS ports mapped completely, the M resource elements with odd or even indices map the N DMRS ports, or M-P resource elements with smaller or larger indices map the N DMRS ports.

With reference to the first aspect, in a possible implementation manner, before the sending end sends the data to be transmitted and the DMRS on the at least one resource element on a data channel according to the correspondence between the at least one demodulation reference signal, DMRS, port and the at least one resource element, the method further includes:

the sending end sends first indication information to the receiving end,

or, the sending end receives the first indication information sent by the receiving end;

wherein the first indication information is used for indicating the mapping rule.

Thus, according to the first indication information, the transmitting end or the receiving end may determine the mapping rule.

Furthermore, the mapping rule may be specified or predefined by a protocol.

Further, the first indication information further includes time-frequency resource information of each of the at least one DMRS ports in a corresponding resource element.

Or the mapping rule is further used to indicate RE information occupied by each of the N DMRS ports in a corresponding resource element.

In other words, the mapping rule may indicate which REs in their corresponding resource elements each DMRS port occupies.

It should be understood that, time-frequency resource information of each of the N DMRS ports in the corresponding resource unit may also be predefined, which is not limited in this application.

Alternatively, the first indication information may be transmitted through Downlink Control Information (DCI), or may be transmitted through other signaling, such as Radio Resource Control (RRC) or media access control (MAC CE), and the like, and the application is not limited to how to transmit the first indication information. Alternatively, the first indication information may be transmitted through other signaling such as Uplink Control Information (UCI).

With reference to the first aspect, in a possible implementation manner, the method further includes:

the sending end sends second indication information to the receiving end, or the sending end receives the second indication information sent by the receiving end; wherein the second indication information is used for indicating the at least one resource element, wherein the at least one resource element is used for mapping the at least one DMRS port.

Further, the second indication information may include any one of the following information:

(1) an index of the at least one resource unit in a time domain and/or a frequency domain.

That is, the second indication information may be an index of a resource element for mapping the DMRS port on a time domain and/or a frequency domain.

(2) Odd or even resource elements.

Here, it means that the resource elements used for mapping the DMRS ports are odd or even resource elements. Taking the second indication information as an odd resource element as an example, it may be determined according to the second indication information that the resource element used for mapping the DMRS port is a resource element whose index in the time domain and/or the frequency domain is odd among all resource elements included in the system, or the resource element used for mapping the DMRS port is a resource element whose index in the time domain and/or the frequency domain is odd among resource elements scheduled by the network device.

(3) One or more remainder t and/or M values, wherein the index of the resource unit satisfies: the resource unit having an index% M ═ t of resource units belongs to the at least one resource unit.

Here, the index of the resource unit may be an index on a time domain and/or a frequency domain. It should be understood that the value of M may be predefined or may be determined by the network device and then communicated to the terminal device.

Alternatively, the second indication information may be transmitted through Downlink Control Information (DCI), or may be transmitted through other signaling, such as Radio Resource Control (RRC) or media access control (MAC CE), and the like, and the application is not limited to how to transmit the second indication information. Alternatively, the second indication information may be transmitted through UCI or other signaling.

With reference to the first aspect, in a possible implementation manner, the mapping rule is further configured to indicate whether, in two groups of resource elements consecutive in a time domain, there is an offset in subcarriers used for mapping the same DMRS port, and an offset in the case of the offset, where the two groups of resource elements are located at the same position in a frequency domain, and each group of resource elements includes M resource elements, and each group of resource elements has one complete mapping of the N DMRS ports; alternatively, the first and second electrodes may be,

the mapping rule is further configured to indicate whether a subcarrier of the same port has an offset and an offset in the presence of the offset in two adjacent resource units, where the two adjacent resource units have the same position in a frequency domain and are spaced by M resource units in a time domain;

or, the mapping rule is further configured to indicate whether, in two groups of resource elements consecutive in a frequency domain, a symbol used for mapping the same DMRS port has an offset, and an offset in the case of the offset, where the two groups of resource elements have the same position in a time domain, and each group of resource elements includes M resource elements, and each group of resource elements has one complete mapping of the N DMRS ports; alternatively, the first and second electrodes may be,

the mapping rule is further configured to indicate whether, in two adjacent resource units, a symbol for mapping the same port has an offset and an offset if the symbol has the offset, where the two adjacent resource units have the same position in the time domain and are spaced by M resource units in the frequency domain.

Optionally, the symbol may be OFDM, but this is not limited in this embodiment of the present application.

It should be understood that, in this application, two resource units spaced by M resource units in the time domain means that the two resource units are spaced by M resource units between the start position or the end position in the time domain. Similarly, two resource units spaced M resource units apart in the frequency domain means that the two resource units are spaced M resource units apart from each other in the starting position or the ending position in the frequency domain.

In a second aspect, a data transmission method is provided, which includes: a receiving end determines a corresponding relation between at least one demodulation reference signal (DMRS) port to be scheduled and at least one resource unit according to a mapping rule, wherein the mapping rule is used for indicating the corresponding relation between N DMRS ports and the resource unit, N is the number of the DMRS ports supported by the system to the maximum, M resource units have one complete mapping of the N DMRS ports, N is not less than 1, M is not less than 2, both N and M are integers, and the at least one DMRS port belongs to the N DMRS ports;

the receiving end receives a data channel, and the data channel bears data to be transmitted and a DMRS;

and the receiving end demodulates the data to be transmitted according to the corresponding relation between the at least one demodulation reference signal DMRS port and the at least one resource unit.

With reference to the second aspect, in a possible implementation manner, any DMRS port of the N DMRS ports uniquely corresponds to one resource element of the M resource elements. Thereby enabling further spectral efficiency improvement.

With reference to the second aspect, in a possible implementation manner, the numbers of DMRS ports corresponding to at least two resource elements in the M resource elements are different, or the numbers of DMRS ports corresponding to any two resource elements in the M resource elements are the same; and/or the presence of a gas in the gas,

With reference to the second aspect, in a possible implementation manner, the M resource units are consecutive in a frequency domain or a time domain.

With reference to the second aspect, in a possible implementation manner, each of the M resource elements corresponds to at least one of the N DMRS ports.

With reference to the second aspect, in a possible implementation manner, the correspondence between the N DMRS ports and the resource elements is any one of the following:

Optionally, in this application, the maximum value of k may be:

alternatively, the first and second electrodes may be,

With reference to the second aspect, in a possible implementation manner, all of the N DMRS ports are mapped to a part of the M resource elements.

With reference to the second aspect, in one possible implementation manner, of the M resource elements with indices k × M to k × M + M-1, resource elements with indices of odd numbers or even numbers map the N DMRS ports, or M-P resource elements with indices of smaller or larger map the N DMRS ports, where P is greater than or equal to 1 and less than or equal to M-1, and P is an integer, k is 0,1,2, … ….

With reference to the second aspect, in a possible implementation manner, the method further includes:

the receiving end sends first indication information to the sending end, or,

the receiving end receives the first indication information sent by the sending end;

Furthermore, the mapping rule may be specified or predefined by a protocol.

With reference to the second aspect, in a possible implementation manner, the first indication information further includes time-frequency resource information of each of the at least one DMRS port in a corresponding resource element. Or the mapping rule is further used to indicate RE information occupied by each of the N DMRS ports in a corresponding resource element.

Optionally, the first indication information may be sent through DCI, or may be sent through other signaling, such as RRC or MAC CE, and the application does not limit how to send the first indication information. Alternatively, the first indication information may be transmitted through UCI or other signaling.

the receiving end sends second indication information to the sending end, or,

the receiving end receives the second indication information sent by the sending end;

wherein the second indication information is used for indicating the at least one resource element, wherein the at least one resource element is used for mapping the at least one DMRS port.

With reference to the second aspect, in a possible implementation manner, the second indication information may include any one of the following information:

an index of the at least one resource unit in time and/or frequency domain;

odd or even resource elements;

one or more remainder t and/or M values, wherein the index of the resource unit satisfies: the resource unit having an index% M ═ t of resource units belongs to the at least one resource unit.

Optionally, the second indication information may be sent through DCI, or may be sent through other signaling, such as RRC or MAC CE, and the like. Alternatively, the second indication information may be transmitted through UCI or other signaling.

In combination with the second aspect, in one possible implementation,

the mapping rule is further used for indicating whether the subcarriers used for mapping the same DMRS port have an offset or not in two groups of resource elements which are consecutive in a time domain, and the offset is the case when the offset exists, wherein the two groups of resource elements have the same position in a frequency domain, each group of resource elements comprises M resource elements, and each group of resource elements has one complete mapping of the N DMRS ports; alternatively, the first and second electrodes may be,

For understanding the same or similar implementation manner as the first aspect in the second aspect, or for understanding the same or similar terms or words as the first aspect in the second aspect, reference may be specifically made to the description of the first aspect, and details are not described here.

In a possible implementation manner, in the present application, the sending end may be a network device, and the receiving end may be a terminal device; alternatively, the transmitting end may be a terminal device, and the receiving end may be a network device.

In a third aspect, a communication device is provided that includes means for performing the method of the first aspect or any one of the possible implementations of the first aspect.

In a fourth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute instructions in the memory to implement the method of the first aspect or any of the possible implementations of the first aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface and controls the communication interface to implement communication with other network elements.

In one implementation, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the communication device is a chip configured in the terminal equipment. When the communication device is a chip configured in a terminal device, the communication interface may be an input/output interface.

In one implementation, the communication device is a network device. When the communication device is a network device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the communication device is a chip configured in the network device. When the communication device is a chip configured in a network device, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.

In a fifth aspect, a communication device is provided, which comprises means for performing the method of the second aspect or any one of its possible implementations.

In a sixth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute the instructions in the memory to implement the method of the second aspect or any of the possible implementations of the second aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface and controls the communication interface to implement communication with other network elements.

In a seventh aspect, a processor is provided, including: input circuit, output circuit and processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor performs the method of any one of the possible implementations of the first to second aspects and the first to second aspects.

In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the signal output by the output circuit may be output to and transmitted by a transmitter, for example and without limitation, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times. The embodiment of the present application does not limit the specific implementation manner of the processor and various circuits.

In an eighth aspect, a processing apparatus is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory, and may receive a signal via the receiver and transmit a signal via the transmitter to perform the method of any one of the possible implementations of the first to second aspects and the first to second aspects.

Optionally, the number of the processors is one or more, and the number of the memories is one or more.

Alternatively, the memory may be integral to the processor or provided separately from the processor.

In a specific implementation process, the memory may be a non-transient memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips.

It will be appreciated that the associated data interaction process, for example, sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information from the processor. In particular, the data output by the processor may be output to a transmitter and the input data received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to as a transceiver, among others.

The processing device in the above eighth aspect may be a chip, the processor may be implemented by hardware or may be implemented by software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated with the processor, located external to the processor, or stand-alone.

In a ninth aspect, there is provided a computer program product, the computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes a computer to perform the method of any of the possible implementations of the first to second aspects and the first to second aspects described above.

A tenth aspect provides a computer-readable medium storing a computer program (which may also be referred to as code or instructions) which, when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first to second aspects and the first to second aspects described above.

In an eleventh aspect, a communication system is provided, which includes the foregoing network device and terminal device.

Drawings

Fig. 1 is a schematic block diagram of a communication system suitable for use in embodiments of the present application.

Fig. 2 is a schematic flow chart of a data transmission method provided in the present application.

Fig. 3 is a diagram of an exemplary DMRS port-to-resource element correspondence.

Fig. 4 is a schematic diagram of a further exemplary DMRS port to resource element correspondence.

Fig. 5 is a schematic diagram of another exemplary DMRS port-to-resource element correspondence.

Fig. 6 is a diagram of an exemplary DMRS port-to-resource element correspondence.

Fig. 7 is a diagram of a correspondence relationship of still another exemplary DMRS port and resource element.

Fig. 8 is a diagram of an exemplary DMRS port-to-resource element correspondence.

Fig. 9 is a diagram of an exemplary DMRS port-to-resource element correspondence.

Fig. 10 is a diagram of an exemplary DMRS port-to-resource element correspondence.

Fig. 11 is a schematic flow chart of another data transmission method provided herein.

Fig. 12 is a schematic flow chart of another data transmission method provided herein.

Fig. 13 is a schematic block diagram of a communication device provided in an embodiment of the present application.

Fig. 14 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Fig. 15 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth generation (5G) or New Radio (NR) system, and the like.

Terminal equipment in the embodiments of the present application may refer to user equipment, access terminals, subscriber units, subscriber stations, mobile stations, remote terminals, mobile devices, user terminals, wireless communication devices, user agents, or user devices. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

The network device in this embodiment may be a device for communicating with a terminal device, where the network device may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, may also be a base station (NodeB) in a Wideband Code Division Multiple Access (WCDMA) system, may also be an evolved NodeB (eNB) or eNodeB) in an LTE system, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network, and the like, and the present embodiment is not limited.

It should be understood that, in the embodiment of the present application, the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. Furthermore, the embodiment of the present application does not particularly limit the specific structure of the execution main body of the method provided by the embodiment of the present application, as long as the communication can be performed according to the method provided by the embodiment of the present application by running the program recorded with the code of the method provided by the embodiment of the present application, for example, the execution main body of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module capable of calling the program and executing the program in the terminal device or the network device.

In addition, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, etc.), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

For the understanding of the embodiments of the present application, a communication system suitable for the embodiments of the present application will be described in detail with reference to fig. 1.

Fig. 1 shows a schematic diagram of a communication system suitable for the data transmission method and apparatus of the embodiment of the present application. As shown in fig. 1, the communication system 100 may include at least one network device 110 and at least one terminal device 120. The network device 110 and the terminal device 120 may communicate via multiple-input multiple-output (MIMO) technology, that is, the communication system 100 may be a MIMO system. In the MIMO system, each transmission antenna (virtual antenna or physical antenna) has an independent data channel, and based on a predicted Reference Signal (RS) signal, the receiver performs channel estimation for each transmission antenna and restores transmission data based on the estimated channel. Wherein the DMRS is used for demodulation of the PDSCH.

NR version (R) 15 can support DMRSs of up to 12 ports, in other words, existing systems can achieve simultaneous transmission of up to orthogonal 12 data streams. However, the spectrum efficiency of 12-port data transmission is far from meeting various NR scenarios, such as a new NR WTTx scenario requiring up to 32/48/64 stream transmission, a real-time unmanned aerial vehicle transmission scenario requiring a rate greater than 300Mbps, an automatic driving scenario, and the like. Obviously, increasing the number of DMRS orthogonal ports is the most straightforward solution to increase spectral efficiency.

The existing protocol provides that DMRSs of all ports corresponding to scheduled data are mapped in one scheduling element (e.g., 12 subcarriers by 14 symbols, or 12 subcarriers by 12 symbols), and in more detail, each DMRS port is mapped in all scheduling elements to which all port data are mapped. Through the mapping mode, the DMRS can have higher time-frequency density to ensure the demodulation performance. However, such DMRS design rules may become a bottleneck for further improvement of spectral efficiency. For example, when 32/48/64 ports are implemented according to the existing DMRS design rule, the overhead is increased dramatically, and 32/48/64 ports cannot be implemented.

In view of this, the present application redesigns a DMRS mapping rule for a scenario with NR multiple high spectral efficiency requirements, so that when a transmitting end transmits data through the mapping rule, the spectral efficiency can be improved.

The data transmission method provided by the application can be applied to downlink communication and can also be applied to uplink communication. When applied to downlink communication, the sending end may be a network device, and correspondingly, the receiving end may be a terminal device. When applied to uplink communication, a transmitting end may be a terminal device, and correspondingly, a receiving end may be a network device. Hereinafter, the method provided by the present application will be described in detail mainly by taking the downlink communication scenario shown in fig. 2 as an example.

It should be understood that, in the present application, the terminal device and/or the network device may perform some or all of the steps in the embodiments of the present application, and these steps or operations are merely examples, and the embodiments of the present application may also perform other operations or variations of various operations. Further, the various steps may be performed in a different order presented in the embodiments of the application, and not all operations in the embodiments of the application may be performed.

It should also be understood that in the embodiments shown below, the first and second are only for the convenience of distinguishing different objects, and should not constitute any limitation to the present application. For example, different indication information is distinguished.

In addition, when describing the methods shown in fig. 2, 11, and 12, some steps are described with a terminal device as an execution subject, and other steps are described with a network device as an execution subject, but this is only for convenience of description of the illustrated methods. The steps performed by the terminal device may also be implemented by a component of the terminal device (e.g., a chip or a circuit), and similarly the steps performed by the network device may also be implemented by a component of the network device (e.g., a chip or a circuit).

It should be noted that, the description of "DMRS port mapping to resource element" and the like referred to herein can be understood as follows: and the DMRS corresponding to the DMRS ports are mapped to the resource units. In addition, unless otherwise specified, all ports in the present application refer to DMRS ports.

Fig. 2 is a schematic diagram of a data transmission method 200 provided in the present application. The method can be applied to downlink communication, and the following describes each step in the method 200 in detail.

S210, the network equipment determines the corresponding relation between at least one DMRS port to be scheduled and at least one resource unit according to the mapping rule.

For ease of understanding and description herein, the at least one resource unit is denoted as: resource unit set # a.

The resource element set # a may be a resource element for mapping the DMRS port, or may be a resource element scheduled by the network device. The resource elements used for mapping the DMRS ports are part or all of all resource elements included in the system, specifically, may be part or all of the resource elements scheduled by the network device, and may also include other resource elements except the resource elements scheduled by the network device in all the resource elements included in the system.

The mapping rule is used for indicating the corresponding relation between N DMRS ports and resource units, wherein N is the number of the DMRS ports supported by the system to the maximum extent, N is not less than 1, and N is an integer. Specifically, the mapping rule may indicate a correspondence between the N DMRS ports and all resource elements included in the system, or may indicate a correspondence between the N DMRS ports and resource elements used for mapping the DMRS ports. That is, according to the mapping rule, it can be determined which resource elements of all resource elements included in the system each DMRS port is mapped to, or which resource elements of the resource elements used for mapping the DMRS ports each DMRS port is mapped to.

Wherein, M resource units have a certain time of complete mapping of the N DMRS ports, M is more than or equal to 2, and M is an integer. That is to say, N DMRS ports are completely mapped to M resource elements, for example, each resource element in the M resource elements may be mapped with a part of the N DMRS ports; or, all of the N DMRS ports may be mapped to some of the M resource elements, and none of the DMRS ports may be mapped to another part of the M resource elements. The time-frequency resource formed by the M resource elements is different from a Physical Resource Block (PRB) defined in LTE, that is, the mapping rule in this application indicates that each DMRS port is not mapped in each scheduling element (i.e., PRB defined in LTE).

It should be understood that the at least one DMRS port to be scheduled belongs to the N DMRS ports, i.e., the at least one DMRS port to be scheduled is some or all of the N DMRS ports. The at least one DMRS port to be scheduled is for a terminal device described herein, which may be any terminal device within a cell served by the network device.

Several possible definitions of resource units in the present application are explained below.

Define one

As is well known to those skilled in the art, the PRB defined in NR is different from the PRB defined in LTE, which contains the concept of time domain and frequency domain, and consists of 12 subcarriers continuous in frequency domain and one slot in time domain, while the concept of frequency domain is only in NR, which includes 12 subcarriers continuous in frequency domain. In order to make the present application better understood by those skilled in the art, the definition of PRB in NR will be used herein to describe various embodiments, and unless otherwise specified, PRB in the present application refers to PRB defined in NR.

Therefore, it can be understood that the resource unit in the present application may be composed of Y PRBs and X slots. Accordingly, the M resource elements are composed of M × Y PRBs and X slots, or the M resource elements are composed of Y PRBs and M × X slots.

In the present application, when the M resource elements are formed of M × Y PRBs and X slots, if X is 1 and Y is 1, the index of the PRB is used as the index of the resource element corresponding to the PRB, for example, referring to fig. 3, when the M resource elements are formed of PRB #0, PRB #1 and slot #0, the resource element corresponding to PRB #0 is referred to as resource element #0, and the resource element corresponding to PRB #1 is referred to as resource element # 1. Similarly, when the M resource elements are composed of Y PRBs and M × X slots, if X is 1 and Y is 1, the index of the slot is used as the index of the resource element corresponding to the slot, for example, referring to fig. 4, when the M resource elements are composed of PRB #0, slot #0 and slot #1, the resource element corresponding to slot #0 is referred to as resource element #0, and the resource element corresponding to slot #1 is referred to as resource element # 1. If at least one of X and Y is not 1, the resource unit index includes two parts, namely an index in the time domain and an index in the frequency domain, where the index in the time domain of the resource unit is an index of a timeslot corresponding to the resource unit, and the index in the frequency domain of the resource unit is an index of a PRB corresponding to the resource unit.

It should be understood that in the resource units shown in fig. 3 to 10 herein, one small square represents one RE.

Definition two

Next, the correspondence between the N DMRS ports and the resource elements will be described.

In one possible implementation, at least one of the N DMRS ports corresponds to multiple ones of the M resource elements. That is, DMRSs corresponding to one DMRS port may be mapped to two or more resource elements.

In another possible implementation, any one of the N DMRS ports corresponds to only one of the M resource elements.

That is, the same DMRS port corresponds to only one resource element of the M resource elements, and does not correspond to multiple resource elements of the M resource elements. For example, assuming that port #1 of the N DMRS ports corresponds to resource unit #0 of the M resource units, no other resource unit of the M resource units than resource unit #0 maps port # 1.

Further, the N DMRS ports and resource elements satisfy one or more of the following:

A. the number of DMRS ports corresponding to at least two resource elements in the M resource elements is different, or the number of DMRS ports corresponding to any two resource elements in the M resource elements is the same.

Assuming that M is 2, N is 24, the M resource elements are resource element #0 and resource element #1, and the N DMRS ports are port #0 to port # 23. Then, the numbers of DMRS ports corresponding to resource unit #0 and resource unit #1 may be different, for example, resource unit #0 may correspond to port #0 to port #9, and resource unit #1 may correspond to port #12 to port #23, or resource unit #0 may correspond to port #0 to port #23, and resource unit #1 does not correspond to any DMRS port. Alternatively, resource unit #0 and resource unit #1 may correspond to 12 DMRS ports, respectively, for example, resource unit #0 may correspond to port #0 to port #11, and resource unit #1 may correspond to port #12 to port # 23.

B. At least two of the N DMRS ports occupy different numbers of Resource Elements (REs), or any two of the N DMRS ports occupy the same number of REs.

Again based on the assumptions in a. Then, two or more ports among port #0 to port #23 occupy different numbers of REs in their corresponding resource units, for example, port #0 occupies 2 REs in its corresponding resource unit #1, port #1 occupies 3 REs in its corresponding resource unit #1, and port #2 occupies 3 REs in its corresponding resource unit # 2. Alternatively, the number of REs occupied by each of the ports #0 to #23 in the resource unit corresponding thereto may be the same, for example, each of the ports occupies 2 REs.

C. The total number of REs used for mapping the DMRS ports in at least two of the M resource elements is different, or the total number of REs used for mapping the DMRS ports in any two of the M resource elements is the same.

Again based on the assumptions in a. Then, the total number of REs used for mapping DMRS ports in resource element #1 may be different from the total number of REs used for mapping DMRS ports in resource element #2, for example, the total number of REs used for mapping DMRS ports in resource element #1 is 12 REs, and the total number of REs used for mapping DMRS ports in resource element #2 is 10 REs. Alternatively, the total number of REs used for mapping DMRS ports in resource element #1 may be the same as the total number of REs used for mapping DMRS ports in resource element #2, for example, all 12 REs. It should be understood that, in this implementation manner, the number of DMRS ports corresponding to resource element #1 and the number of DMRS ports corresponding to resource element #2 may be the same or different, and this is not limited in this embodiment of the application.

In the following, specific correspondence between the N DMRS ports and the resource elements is described in each case, with reference to whether each of the M resource elements has a corresponding DMRS port.

Situation one

Each of the M resource elements corresponds to at least one of the N DMRS ports. That is, there is a corresponding DMRS port for each of the M resource elements.

In this case, the correspondence between the N DMRS ports and the resource elements may be specifically one of the following correspondence one to correspondence three. Wherein, in the following, i ═ 0,1, … …, N-1, k ═ 0,1,2, … …, j is an integer and j ∈ [0,1, … …, M-1 ].

Optionally, in this application, the maximum value of k may be:

alternatively, the first and second electrodes may be,

Corresponding relation 1

The DMRS port with index i of the N DMRS ports corresponds to a resource element with index j + k × M, where i% M ═ j,% indicates the remainder.

For example, when M is 2, a DMRS port with an even index among N DMRS ports corresponds to a resource element with an even index, and a DMRS port with an odd index corresponds to a resource element with an odd index. For example, assuming that M is 2 and N is 24, and the N DMRS ports are port #0 to port #23, referring to fig. 3 and 4, for resource unit #0 and resource unit #1, a port with an even index among port #0 to port #23 corresponds to resource unit #0, and a port with an odd index corresponds to resource unit # 1.

It should be understood that in the example shown in fig. 3, the index of the resource element is the index of the PRB, and the resource elements corresponding to different slots of the same PRB correspond to the same DMRS port. In the example shown in fig. 4, the index of the resource element is the index of the slot, and the resource elements corresponding to different PRBs of the same slot correspond to the same DMRS port.

It should also be understood that the RE positions occupied by the DMRSs in the resource elements shown in fig. 3 and fig. 4 are only exemplary and should not limit the present application in any way. It should also be understood that, when M is 2, a DMRS port with an even index among the N DMRS ports may also correspond to a resource element with an odd index, and a DMRS port with an odd index may correspond to a resource element with an even index, which is not limited in this application.

As another example, assuming that M is 3, N is 24, and the N DMRS ports are port #0 to port #23, for resource units #0 to resource units #2, port #0, port #3, port #6, port #9, port #12, port #15, port #18, and port #21 correspond to resource unit #0, port #1, port #4, port #7, port #10, port #13, port #16, port #19, and port #22 correspond to resource unit #1, and port #2, port #5, port #8, port #11, port #14, port #17, port #20, and port #23 correspond to resource unit # 2.

Corresponding relation two

In M resource elements with indexes from k M to k M + M-1, the index of any DMRS port corresponding to the resource element with a smaller index is smaller than the index of any DMRS port corresponding to the resource element with a larger index. In other words, for any M resource elements with N DMRS ports mapped completely, the index of any DMRS port corresponding to a resource element with a smaller index is smaller than the index of any DMRS port corresponding to a resource element with a larger index.

For example, when M is 2 and N is 24, resource unit #0 corresponds to port #0 to port #10 and resource unit #1 corresponds to port #11 to port #23 for resource units #0 to # 3. Resource unit #2 corresponds to port #0 to port #10, and resource unit #3 corresponds to port #11 to port # 23.

It should be understood that, in the second correspondence relationship, the numbers of DMRS ports corresponding to the M resource elements may be the same or different, and the application does not limit this.

Corresponding relation three

In M resource elements with indexes from k M to k M + M-1, the index of any DMRS port corresponding to the resource element with a smaller index is larger than the index of any DMRS port corresponding to the resource element with a larger index. In other words, for any M resource elements with N DMRS ports mapped completely, the index of any DMRS port corresponding to a resource element with a smaller index is greater than the index of any DMRS port corresponding to a resource element with a larger index.

For example, when M is 2 and N is 24, resource unit #0 corresponds to port #11 to port #23 and resource unit #1 corresponds to port #0 to port #10 for resource units #0 to # 3. Resource unit #2 corresponds to port #11 to port #23, and resource unit #3 corresponds to port #0 to port # 10.

It should be understood that, in the third correspondence relationship, the numbers of DMRS ports corresponding to the M resource elements may be the same or different, and this application does not limit this.

Situation two

The N DMRS ports are all mapped to a portion of the M resource elements. That is, any of the N DMRS ports is not mapped to other resource elements of the M resource elements except for the partial resource elements.

In this case, the correspondence between the N DMRS ports and the resource elements may specifically be a correspondence of four:

and in M resource elements with indexes from k M to k M + M-1, the resource elements with indexes of odd numbers or even numbers map the N DMRS ports, or M-P resource elements with smaller or larger indexes map any one of the N DMRS ports, P is more than or equal to 1 and less than or equal to M-1, P is an integer, and k is 0,1,2 and … ….

For example, assuming that M is 2 and the N DMRS ports are port #0 to port #23, referring to fig. 5 and 6, all of port #0 to port #23 may be mapped to resource unit #0, and none of the ports may be mapped to resource unit # 1. Alternatively, all of port #0 to port #23 may be mapped to resource unit #1, and none of the ports may be mapped to resource unit # 0.

It should be understood that in the example shown in fig. 5, the index of the resource element is the index of the PRB, and the resource elements corresponding to different slots of the same PRB correspond to the same DMRS port. In the example shown in fig. 6, the index of the resource element is the index of the slot, and the resource elements corresponding to different PRBs of the same slot correspond to the same DMRS port.

For another example, assuming that M is 3, the N DMRS ports are port #0 to port #23, all of port #0 to port #23 may be mapped to resource unit #0, and none of resource unit #1 and resource unit #2 may be mapped to any port. Alternatively, some of the ports #0 to #23 may be mapped to resource unit #0, the rest may be mapped to resource unit #1, and none of the ports may be mapped to resource unit # 2.

Optionally, as an embodiment of the present application, the mapping rule is further configured to indicate time-frequency resource information of each of the N DMRS ports in a corresponding resource element, or the mapping rule is further configured to indicate RE information occupied by each of the N DMRS ports in the corresponding resource element.

As an example, in the present application, port #0 and port #1 may be mapped to subcarriers within corresponding resource units

0,2,4,6,8,10, port #2 and port #3 may be mapped to

frequency domain subcarriers

1,3,5,7,9,11 within the corresponding resource unit; alternatively, port #0 and port #1 may be mapped to

frequency domain subcarriers

0,1,6,7 within the corresponding resource unit, and port #2 and port #3 may be mapped to

frequency domain subcarriers

2,3,8,9 within the corresponding resource unit. port #4 and port #5 may be mapped on frequency domain subcarriers 4,5,10,11 within the corresponding resource unit.

The corresponding relationship between the resource elements and the DMRS ports shown in fig. 7 to 10 is taken as an example for description. In fig. 7 to 10, it is assumed that N is 48, even resource units are used to map port #0 to port #23, and odd resource units are used to map port #24 to port # 47.

Referring to fig. 7, resource unit #0 and resource unit #2 map the same port, and resource unit #0 and resource unit #2 are adjacent but discontinuous in the frequency domain. The offset of the time-frequency resources used for mapping the same DMRS port in resource element #0 and resource element #2 is 2 OFDM symbols. Similarly, resource unit #1 and resource unit #3 map the same port, and resource unit #1 and resource unit #3 are adjacent but discontinuous in the frequency domain. The offset of the time-frequency resources used for mapping the same DMRS port in resource element #1 and resource element #3 is 2 OFDM symbols.

Referring to fig. 8, a resource unit #0 and a resource unit #1 corresponding to a slot #0 constitute a set of resource units, and a resource unit #0 and a resource unit #1 corresponding to a slot #1 constitute a set of resource units. Two groups of resource units map the same port, while two groups of resource units are consecutive in time domain. And the offset of the time-frequency resource used for mapping the same port in the two groups of resource units is 12 subcarriers.

Referring to fig. 9, resource element #0 and resource element #1 corresponding to PRB #0 constitute a set of resource elements, and resource element #0 and resource element #1 corresponding to PRB #1 constitute a set of resource elements. Two groups of resource units map the same port, while two groups of resource units are contiguous in the frequency domain. And the offset of the time-frequency resource used for mapping the same port in the two groups of resource units is 2 OFDM symbols.

Referring to fig. 10, resource unit #0 and resource unit #2 map the same port, and resource unit #0 and resource unit #2 are adjacent but discontinuous in the time domain. The offset of the time-frequency resources used for mapping the same DMRS port in resource element #0 and resource element #2 is 7 subcarriers. Similarly, resource unit #1 and resource unit #3 map the same port, and resource unit #1 and resource unit #3 are adjacent but not contiguous in the time domain. The offset of the time-frequency resources used for mapping the same DMRS port in resource element #1 and resource element #3 is 7 subcarriers.

S220, the network equipment sends the first indication information to the terminal equipment. Accordingly, the terminal device receives the first indication information sent by the network device. Wherein the first indication information is used for indicating the mapping rule.

It should be noted that S220 is an optional step and may or may not be executed.

In particular, in one implementation, the mapping rule may be determined by the network device itself. In this manner, S220 may be executed, that is, the network device may send indication information for indicating the mapping rule, that is, first indication information, to the terminal device, and the terminal device may determine the mapping rule according to the first indication information.

In another implementation, the mapping rule may be predefined. In this manner, S220 may not be performed.

Optionally, the first indication information may be sent through DCI, or may be sent through other signaling, such as RRC or MAC CE, and the application does not limit how to send the first indication information.

Further, the first indication information may further include time-frequency resource information of each of the at least one DMRS port in the corresponding resource element, that is, RE information occupied by each of the at least one DMRS port in the corresponding resource element.

And S230, the network equipment sends second indication information to the terminal equipment. Correspondingly, the terminal equipment receives the second indication information sent by the network equipment. Wherein the second indication information is used to indicate the resource unit set # a.

It should be noted that S230 is an optional step and may or may not be executed.

Specifically, in the case that the resource element set # a is a resource element for mapping a DMRS port, S230 may be performed, that is, the network device may transmit second indication information to the terminal device, and the terminal device may determine the resource element for mapping the DMRS port according to the second indication information. In the case that the resource unit set # a is a resource unit scheduled by the network device, S230 may not be executed, and it should be understood that the resource unit information scheduled by the network device may be notified by the DCI by the network device, or may be transmitted to the terminal device by other signaling, such as RRC or MAC CE.

Alternatively, the second indication information may be an index of a resource element used for mapping the DMRS port on a time domain and/or a frequency domain.

Alternatively, the second indication information may be odd or even resource elements. Here, it means that the resource elements used for mapping the DMRS ports are odd or even resource elements. Taking the second indication information as an odd resource element as an example, it may be determined according to the second indication information that the resource element used for mapping the DMRS port is a resource element whose index in the time domain and/or the frequency domain is odd among all resource elements included in the system, or the resource element used for mapping the DMRS port is a resource element whose index in the time domain and/or the frequency domain is odd among resource elements scheduled by the network device.

Alternatively, the second indication may be one or more of the value of the remainder t and/or the value of M. Specifically, in all resource elements included in the system, if the index% M of a resource element is t, the resource element is considered as a resource element for mapping a DMRS port. Here, the index of the resource unit may be an index on a time domain and/or a frequency domain. It should be understood that the value of M may be predefined or may be determined by the network device and then communicated to the terminal device.

Optionally, the second indication information may be sent through DCI, or may be sent through other signaling, such as RRC or MAC CE, and the like.

It should be understood that, in the case where both S220 and S230 are executed, the present application does not limit the execution order of the two.

It should also be understood that the second indication information may be sent through the same signaling as the first indication information, or may be sent through a different signaling from the first indication information, which is not limited in this application.

And S240, the terminal equipment determines the corresponding relation between the at least one DMRS port to be scheduled and the resource unit set # A according to the mapping rule.

For example, the terminal device may first determine the mapping rule according to the first indication information, and determine the resource element set # a according to the second indication information, so that the terminal device may determine the correspondence between the at least one DMRS port to be scheduled and the resource element set # a.

For another example, the terminal device may store the mapping rule in advance, and after determining the resource unit set # a according to the second indication information, may determine a corresponding relationship between the at least one DMRS port to be scheduled and the resource unit set # a.

It should be understood that the terminal device may determine the at least one DMRS port information to be scheduled through the prior art, for example, the terminal device may determine the at least one DMRS port information to be scheduled through DCI sent by the network device, which is not described in detail herein.

And S250, the network equipment sends the data to be transmitted and the DMRS on a data channel according to the corresponding relation between the at least one DMRS port to be scheduled and the resource unit set # A. Accordingly, the terminal device receives the data channel.

Specifically, after determining the correspondence between the at least one DMRS port to be scheduled and the resource element set # a, the network device maps the at least one DMRS port to be scheduled to the corresponding resource elements, maps the data to be transmitted to the resource elements scheduled by the network device, and then transmits the data to be transmitted and the DMRS on a data channel, and accordingly, the terminal device receives the data channel.

And S260, the terminal equipment demodulates the data to be transmitted according to the corresponding relation between the at least one DMRS port to be scheduled and the resource unit set # A.

Specifically, after the terminal device determines the correspondence between the at least one DMRS port to be scheduled and the resource element set # a, channel estimation may be performed according to the DMRS on the resource element corresponding to each of the at least one DMRS port to be scheduled, and then the data to be transmitted is demodulated. For how to perform channel estimation and data demodulation by a specific terminal device according to a DMRS, reference may be made to the prior art, and details are not described here.

In summary, in the data transmission method according to the embodiment of the present application, N DMRS ports are completely mapped on M resource elements, instead of mapping all DMRS ports on each PRB (PRB defined in LTE), which can reduce the overhead of DMRS on a single PRB (PRB defined in LTE) and improve spectral efficiency.

The scenario that the method of the present application is applied to downlink communication is mainly introduced above, and the scenario that the method of the present application is applied to uplink communication is briefly described below. It should be understood that the same concepts or terms, such as resource units, etc., appearing hereinafter as those described above have the same meanings as those described above and will not be described further below.

Fig. 11 is a schematic diagram of a data transmission method 300 provided in the present application. The method can be applied to a scenario in which a terminal device maps a DMRS according to an instruction of a network device in uplink communication, and each step in the method 300 is described in detail below.

S310, the network equipment determines the corresponding relation between at least one DMRS port to be scheduled and at least one resource unit according to the mapping rule.

S320, the network equipment sends the first indication information to the terminal equipment. Accordingly, the terminal device receives the first indication information sent by the network device. The first indication information is used for indicating a mapping rule.

S330, the network equipment sends second indication information to the terminal equipment. Correspondingly, the terminal equipment receives the second indication information sent by the network equipment. Wherein the second indication information is used to indicate the resource unit set # a.

And S340, the terminal equipment determines the corresponding relation between the at least one DMRS port to be scheduled and the resource unit set # A according to the mapping rule.

For S310 to S340, reference may be made to the descriptions of S210 to S240 in the above description, and details are not repeated here.

And S350, the terminal equipment sends the data to be transmitted and the DMRS on the data channel according to the corresponding relation between the at least one DMRS port to be scheduled and the resource unit set # A. Accordingly, the network device receives the data channel.

Specifically, after determining the correspondence between the at least one DMRS port to be scheduled and the resource element set # a, the terminal device maps the at least one DMRS port to be scheduled to the corresponding resource element respectively, maps the data to be transmitted to the resource element scheduled by the network device, and then transmits the data to be transmitted and the DMRS on a data channel, and accordingly, the network device receives the data channel.

And S360, the network equipment demodulates the data to be transmitted according to the corresponding relation between the at least one DMRS port to be scheduled and the resource unit set # A.

Specifically, after determining the correspondence between the at least one DMRS port to be scheduled and the resource element set # a, the network device may perform channel estimation according to the DMRS on the resource element corresponding to each of the at least one DMRS port to be scheduled, and then demodulate the data to be transmitted. For how to perform channel estimation and demodulate data according to DMRS, reference may be made to the prior art, and details are not described here.

Therefore, in the data transmission method according to the embodiment of the present application, N DMRS ports are completely mapped on M resource elements, instead of mapping all DMRS ports on each PRB (PRB defined in LTE), which can reduce the overhead of DMRS on a single PRB (PRB defined in LTE) and improve spectral efficiency.

Fig. 12 is a schematic diagram of a data transmission method 400 provided in the present application. The method can be applied to a scenario in which a network device demodulates the DMRS according to an instruction of a terminal device in uplink communication, and each step in the method 400 is described in detail below.

And S410, the terminal equipment determines the corresponding relation between the at least one DMRS port to be scheduled and the resource unit set # A according to the mapping rule.

S410 is similar to S210, and only the execution subject is different, and S410 may refer to the description of S210 above, which is not described herein again.

It should be understood that, the terminal device may determine the information of the at least one DMRS port to be scheduled through the prior art, which is not described in detail herein.

S420, the terminal device sends first indication information to the network device. Accordingly, the network equipment receives the first indication information sent by the terminal equipment. Wherein the first indication information is used for indicating the mapping rule.

In particular, the mapping rule may be determined by the terminal device itself. In this manner, S420 may be executed, that is, the terminal device may send indication information for indicating the mapping rule, that is, first indication information, to the network device, and the network device may determine the mapping rule according to the first indication information.

Optionally, the first indication information may be sent through Uplink Control Information (UCI), or may be sent through other signaling, and the application does not limit how to send the first indication information.

S430, the terminal device sends second indication information to the network device. Accordingly, the network device receives the second indication information sent by the terminal device. Wherein the second indication information is used to indicate the resource unit set # a.

It should be noted that S430 is an optional step, and may or may not be executed.

Specifically, in the case that the resource element set # a is a resource element for mapping DMRS ports, S430 may be performed, that is, the terminal device may transmit second indication information to the network device, and the network device may determine the resource elements for mapping DMRS ports according to the second indication information. In the case where resource unit set # a is a resource unit scheduled by the network device, S430 may not be performed, and it should be understood that the resource unit information scheduled by the network device may be notified to the terminal device by DCI or other signaling by the network device.

Alternatively, the second indication may be one or more of the value of the remainder t and/or the value of M. Specifically, in all resource elements included in the system, if the index% M of a resource element is t, the resource element is considered as a resource element for mapping a DMRS port. Here, the index of the resource unit may be an index on a time domain and/or a frequency domain. It should be understood that the value of M may be predefined or may be determined by the terminal device and then communicated to the network device.

Optionally, the second indication information may be sent through UCI, or may be sent through other signaling, such as RRC or MAC CE, and the application does not limit how to send the second indication information.

It should be understood that, in the case where both S420 and S430 are executed, the present application does not limit the execution order of the two. In addition, the second indication information may be sent through the same signaling as the first indication information, or may be sent through different signaling from the first indication information, which is not limited in this application.

S440, the network device determines the corresponding relationship between the at least one DMRS port to be scheduled and the resource element set # A according to the mapping rule.

For example, the network device may first determine the mapping rule according to the first indication information, and determine the resource element set # a according to the second indication information, so that the network device may determine a correspondence relationship between the at least one DMRS port to be scheduled and the resource element set # a.

S450, the terminal equipment sends the data to be transmitted and the DMRS on the data channel according to the corresponding relation between the at least one DMRS port to be scheduled and the resource unit set # A. Accordingly, the network device receives the data channel.

And S460, the network equipment demodulates the data to be transmitted according to the corresponding relation between the at least one DMRS port to be scheduled and the resource unit set # A.

It should be understood that, in the foregoing embodiments, the sequence numbers of the processes do not imply an execution sequence, and the execution sequence of the processes should be determined by functions and internal logic of the processes, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The method provided by the embodiment of the present application is described in detail above with reference to fig. 2 to 12. Hereinafter, the apparatus provided in the embodiment of the present application will be described in detail with reference to fig. 13 to 15.

Fig. 13 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown in fig. 13, the communication device 500 may include a processing unit 510 and a transceiving unit 520.

In one possible design, the communication apparatus 500 may correspond to the network device in the above method embodiment, and may be, for example, a network device or a chip configured in a network device.

Specifically, the communication apparatus 500 may correspond to the network device in the method 200, the method 300 and the method 400 according to the embodiment of the present application, and the communication apparatus 500 may include means for performing the method performed by the network device in the method 200 in fig. 2, the method 300 in fig. 11 and the method 400 in fig. 12. Also, the units and other operations and/or functions described above in the communication apparatus 500 are respectively for implementing the corresponding flows of the method 200 in fig. 2, the method 300 shown in fig. 11, and the method 400 shown in fig. 12.

Wherein, when the communication device 500 is used to execute the method 200 in fig. 2, the processing unit 510 is configured to execute step S210 in the method 200, and the transceiver unit 520 is configured to execute step S220, step S240, and step S250 in the method 200.

When the communication device 500 is configured to perform the method 300 in fig. 11, the processing unit 510 may be configured to perform steps S310 and S360 in the method 300, and the transceiver unit 520 may be configured to perform steps S320, S330 and S350 in the method 300.

When the communication device 500 is configured to perform the method 400 in fig. 12, the processing unit 510 may be configured to perform steps S440 and S460 in the method 400, and the transceiver unit 520 may be configured to perform steps S420, S430, and S450 in the method 400.

It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

It is also understood that the processing unit 510 in the communication apparatus 500 may correspond to the processor 710 in the network device 700 shown in fig. 15, and the transceiving unit 520 may correspond to the transceiver 720 in the network device 700 shown in fig. 15.

In another possible design, the communication apparatus 500 may correspond to the terminal device in the above method embodiment, and may be the terminal device or a chip configured in the terminal device, for example.

Specifically, the communication apparatus 500 may correspond to the terminal device in the

method

200, 300 or 400 according to the embodiment of the present application, and the communication apparatus 500 may include means for performing the method performed by the terminal device in the method 200 in fig. 2, the method 300 in fig. 11 or the method 400 in fig. 12. Also, the units and other operations and/or functions described above in the communication apparatus 500 are respectively for implementing the corresponding flows of the method 200 in fig. 2, the method 300 in fig. 11, or the method 400 in fig. 12.

Wherein, when the communication device 500 is used to execute the method 200 in fig. 2, the transceiver unit 520 may be used to execute the steps S220, S230, and S250 in the method 200, and the processing unit 510 may be used to execute the steps S240 and S260 in the method 200.

When the communication device 500 is used to execute the method 300 in fig. 11, the transceiver unit 520 may be used to execute the steps S320, S330 and S350 in the method 300, and the processing unit 510 may be used to execute the step S340 in the method 300.

When the communication device 500 is configured to perform the method 400 in fig. 12, the transceiver unit 520 may be configured to perform the steps S420, S430 and S450 in the method 400, and the processing unit 510 may be configured to perform the step 410 in the method 400.

It should be understood that in the communication apparatus 500, the processing unit 510 may correspond to the processor 601 in the terminal device 600 shown in fig. 14, and the transceiving unit 520 may correspond to the transceiver 602 in the terminal device 600 shown in fig. 14.

Fig. 14 is a schematic structural diagram of a terminal device 600 according to an embodiment of the present application. As shown, the terminal device 600 includes a processor 601 and a transceiver 602. Optionally, the terminal device 600 further comprises a memory 603. Wherein, the processor 601, the transceiver 602 and the memory 603 can communicate with each other via the internal connection path to transmit control and/or data signals, the memory 603 is used for storing a computer program, and the processor 601 is used for calling and running the computer program from the memory 603 to control the transceiver 602 to transmit and receive signals. Optionally, the terminal device 600 may further include an antenna 504, configured to send uplink data or uplink control signaling output by the transceiver 602 by using a wireless signal.

The processor 601 and the memory 603 may be combined into a processing device, and the processor 601 is configured to execute the program code stored in the memory 603 to implement the above-described functions. It should be understood that the processing devices shown in the figures are examples only. In particular implementations, the memory 603 may also be integrated into the processor 601 or may be separate from the processor 601. This is not limited in this application.

The terminal device 600 further includes an antenna 610, configured to send out uplink data or uplink control signaling output by the transceiver 602 through a wireless signal.

When the program instructions stored in the memory 603 are executed by the processor 601, the processor 601 is configured to determine a correspondence between at least one DMRS port to be scheduled and at least one resource element according to a mapping rule, where the mapping rule is used to indicate a correspondence between N DMRS ports and resource elements, where N is the number of DMRS ports supported by a system to the maximum, M resource elements have one complete mapping of the N DMRS ports, N is greater than or equal to 1, M is greater than or equal to 2, and both N and M are integers, and the at least one DMRS port belongs to the N DMRS ports. Or, the processor may be further configured to demodulate the data to be transmitted according to the correspondence between the at least one demodulation reference signal DMRS port and the at least one resource element.

Specifically, the terminal device 600 may correspond to the terminal device in the

method

200, 300 or 400 according to the embodiment of the present application, and the terminal device 600 may include a unit for performing the method performed by the terminal device in the method 200 in fig. 2, the method 300 in fig. 11 or the method 400 in fig. 12. Also, the units and other operations and/or functions described above in the terminal device 600 are respectively for implementing the corresponding flows of the method 200 in fig. 2, the method 300 in fig. 11 or the method 400 in fig. 12. The processor 601 may be configured to perform the actions implemented inside the terminal device described in the foregoing method embodiments, and the transceiver 602 may be configured to perform the actions transmitted to or received from the network device by the terminal device described in the foregoing method embodiments. Please refer to the description of the previous embodiment of the method, which is not repeated herein.

Optionally, the terminal device 600 may further include a power supply 605 for supplying power to various devices or circuits in the terminal device.

In addition to this, in order to further improve the functions of the terminal apparatus, the terminal apparatus 600 may further include one or more of an input unit 606, a display unit 607, an audio circuit 608, a camera 609, a sensor 622, and the like, which may further include a speaker 6082, a microphone 6084, and the like.

Fig. 15 is a schematic structural diagram of a network device 700 according to an embodiment of the present application. As shown, the network device 700 includes a processor 710 and a transceiver 720. Optionally, the network device 700 further comprises a memory 730. The processor 710, the transceiver 720 and the memory 730 communicate with each other via the internal connection path to transmit control and/or data signals, the memory 730 is used for storing a computer program, and the processor 710 is used for calling and running the computer program from the memory 730 to control the transceiver 720 to transmit and receive signals.

The processor 710 and the memory 730 may be combined into a single processing device, and the processor 710 may be configured to execute the program codes stored in the memory 730 to implement the functions described above. In particular implementations, the memory 730 may be integrated with the processor 710 or may be separate from the processor 710.

The network device 700 may further include an antenna 740, configured to send the downlink data or the downlink control signaling output by the transceiver 720 through a wireless signal.

When the program instructions stored in the memory 730 are executed by the processor 710, the processor 710 is configured to determine a correspondence between at least one DMRS port to be scheduled and at least one resource element according to a mapping rule, where the mapping rule is used to indicate a correspondence between N DMRS ports and resource elements, where N is the number of DMRS ports supported by a system to the maximum, M resource elements have one complete mapping of the N DMRS ports, N is greater than or equal to 1, M is greater than or equal to 2, and both N and M are integers, and the at least one DMRS port belongs to the N DMRS ports. Or, the processor may be further configured to demodulate the data to be transmitted according to the correspondence between the at least one demodulation reference signal DMRS port and the at least one resource element.

In particular, the network device 700 may correspond to a network device in the

method

200, 300 or 400 according to an embodiment of the present application, and the network device 700 may include means for performing the method performed by the network device in the method 200 in fig. 2, the method 300 in fig. 11 or the method 400 in fig. 12. Moreover, each unit and the other operations and/or functions in the network device 700 are respectively for implementing the corresponding flows of the method 200 in fig. 2, the method 300 in fig. 11, or the method 400 in fig. 12, and specific processes for each unit to execute the corresponding steps have been described in detail in the foregoing method embodiment, and are not described again here for brevity.

The processor 710 may be configured to perform the actions described in the previous method embodiments that are implemented inside the network device, and the transceiver 720 may be configured to perform the actions described in the previous method embodiments that the network device transmits to or receives from the terminal device. Please refer to the description of the previous embodiment of the method, which is not repeated herein.

It should be understood that the processor in the embodiments of the present application may be a Central Processing Unit (CPU), and the processor may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.

It will also be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can 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 example, but not limitation, many forms of Random Access Memory (RAM) are available, such as Static RAM (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct bus RAM (DR RAM).

According to the method provided by the embodiment of the present application, the present application further provides a computer program product, which includes: computer program code which, when run on a computer, causes the computer to perform the method in the embodiment shown in fig. 2, 11 or 12.

There is also provided a computer readable medium having program code stored thereon, which when run on a computer causes the computer to perform the method of the embodiment shown in fig. 2, 11 or 12, according to the method provided by the embodiments of the present application.

According to the method provided by the embodiment of the present application, the present application further provides a system, which includes the foregoing one or more terminal devices and one or more network devices.

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded or executed on a computer, cause the flow or functions according to embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more collections of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., Digital Versatile Disk (DVD)), or a semiconductor medium. The semiconductor medium may be a solid state disk.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

It should be understood that "and/or" in the present application, describing an association relationship of associated objects, means that there may be three relationships, for example, a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one" means one or more than one; "at least one of a and B", similar to "a and/or B", describes an association relationship of associated objects, meaning that three relationships may exist, for example, at least one of a and B may mean: a exists alone, A and B exist simultaneously, and B exists alone.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of data transmission, comprising:

a sending end determines a corresponding relation between at least one demodulation reference signal (DMRS) port to be scheduled and at least one resource unit according to a mapping rule, wherein the mapping rule is used for indicating the corresponding relation between N DMRS ports and the resource unit, N is the number of the DMRS ports supported by the system to the maximum, M resource units have one complete mapping of the N DMRS ports, N is not less than 1, M is not less than 2, both N and M are integers, and the at least one DMRS port belongs to the N DMRS ports;

2. The method of claim 1, wherein any of the N DMRS ports uniquely corresponds to one of the M resource elements.

3. The method according to claim 1 or 2, wherein the number of DMRS ports corresponding to at least two of the M resource elements is different, or the number of DMRS ports corresponding to any two of the M resource elements is the same; and/or the presence of a gas in the gas,

4. The method of any one of claims 1 to 3, wherein the M resource elements are contiguous in frequency domain or time domain.

5. The method of claim 4, wherein each of the M resource elements corresponds to at least one of the N DMRS ports.

6. The method of claim 5, wherein the correspondence of the N DMRS ports to resource elements is any one of:

in M resource elements with indexes from k M to k M + M-1, the index of any DMRS port corresponding to the resource element with a smaller index is smaller than the index of any DMRS port corresponding to the resource element with a larger index, or the index of any DMRS port corresponding to the resource element with a smaller index is larger than the index of any DMRS port corresponding to the resource element with a larger index;

7. The method of claim 4, wherein the N DMRS ports are all mapped to a portion of the M resource elements.

8. The method of claim 7, wherein of the M resource elements indexed k M through k M + M-1, resource elements indexed odd or even map the N DMRS ports, or M-P resource elements indexed smaller or larger map the N DMRS ports, 1 ≦ P ≦ M-1, and P is an integer, k ≦ 0,1,2, … ….

9. The method according to any one of claims 1 to 8, wherein before the transmitting end transmits the data to be transmitted and the DMRS on the at least one resource element on a data channel according to the correspondence of the at least one demodulation reference signal, DMRS, port with the at least one resource element, the method further comprises:

the sending end sends first indication information to the receiving end, or,

the sending end receives the first indication information sent by the receiving end;

10. The method of claim 9, wherein the first indication information further comprises time-frequency resource information for each of the at least one DMRS ports in a corresponding resource element.

11. The method of any one of claims 1 to 10, further comprising:

the sending end sends second indication information to the receiving end, or,

the sending end receives the second indication information sent by the receiving end;

12. The method of claim 11, wherein the second indication information may include any one of the following information:

an index of the at least one resource unit in time and/or frequency domain;

odd or even resource elements;

13. The method of any one of claims 1 to 12, wherein the mapping rule is further used to indicate whether there is an offset in subcarriers used to map the same DMRS port in two groups of resource elements consecutive in time domain, and an offset if there is an offset, wherein the two groups of resource elements are located the same in frequency domain and each group of resource elements comprises M resource elements, there being one complete mapping of the N DMRS ports per group of resource elements; alternatively, the first and second electrodes may be,

14. A method of data transmission, comprising:

a receiving end determines a corresponding relation between at least one demodulation reference signal (DMRS) port to be scheduled and at least one resource unit according to a mapping rule, wherein the mapping rule is used for indicating the corresponding relation between N DMRS ports and the resource unit, N is the number of the DMRS ports supported by the system to the maximum, M resource units have one complete mapping of the N DMRS ports, N is not less than 1, M is not less than 2, both N and M are integers, and the at least one DMRS port belongs to the N DMRS ports;

15. The method according to claim 14, wherein the DMRS ports corresponding to at least two of the M resource elements are different in number, or wherein the DMRS ports corresponding to any two of the M resource elements are the same in number; and/or the presence of a gas in the gas,

16. The method of claim 14 or 15, wherein the M resource elements are contiguous in frequency domain or time domain.

17. The method of claim 16, wherein each of the M resource elements corresponds to at least one of the N DMRS ports.

18. The method of claim 17, wherein the correspondence of the N DMRS ports to resource elements is any one of:

19. The method of claim 16, wherein the N DMRS ports are all mapped to a portion of the M resource elements.

20. The method of claim 19, wherein of M resource elements indexed k M through k M + M-1, resource elements indexed odd or even map the N DMRS ports, or M-P resource elements indexed smaller or larger map the N DMRS ports, 1 ≦ P ≦ M-1, and P is an integer, k ≦ 0,1,2, … ….

21. The method of any of claims 14 to 20, further comprising:

the receiving end sends first indication information to the sending end, or,

22. The method of claim 21, wherein the first indication information further comprises time-frequency resource information for each of the at least one DMRS ports in a corresponding resource element.

23. The method of any of claims 14 to 22, further comprising:

the receiving end sends second indication information to the sending end, or,

24. The method of claim 23, wherein the second indication information may include any one of the following information:

an index of the at least one resource unit in time and/or frequency domain;

odd or even resource elements;

25. The method of any of claims 14 to 24, wherein the mapping rule is further used to indicate whether there is an offset in subcarriers used to map the same DMRS port in two groups of resource elements consecutive in time domain, and an offset if there is an offset, wherein the two groups of resource elements are located the same in frequency domain and each group of resource elements comprises M resource elements, there being one complete mapping of the N DMRS ports per group of resource elements; alternatively, the first and second electrodes may be,

26. A communications apparatus, comprising:

the device comprises a processing unit and a resource unit, wherein the processing unit is used for determining the corresponding relation between at least one demodulation reference signal (DMRS) port to be scheduled and at least one resource unit according to a mapping rule, the mapping rule is used for indicating the corresponding relation between N DMRS ports and the resource unit, N is the number of the DMRS ports supported by the system to the maximum, M resource units are provided with one-time complete mapping of the N DMRS ports, N is more than or equal to 1, M is more than or equal to 2, both N and M are integers, and the at least one DMRS port belongs to the N DMRS ports;

and the transceiving unit is used for sending the data to be transmitted and the DMRS on a data channel according to the corresponding relation between the at least one demodulation reference signal DMRS port and the at least one resource unit.

27. The apparatus of claim 26, wherein any of the N DMRS ports uniquely corresponds to one of the M resource elements.

28. The apparatus according to claim 26 or 27, wherein the DMRS ports corresponding to at least two of the M resource elements are different in number, or wherein the DMRS ports corresponding to any two of the M resource elements are the same in number; and/or the presence of a gas in the gas,

29. The apparatus of any one of claims 26 to 28, wherein the M resource units are contiguous in frequency domain or time domain.

30. The apparatus of claim 29, wherein each of the M resource elements corresponds to at least one of the N DMRS ports.

31. The apparatus of claim 31, wherein the correspondence of the N DMRS ports to resource elements is any one of:

32. The apparatus of claim 29, wherein the N DMRS ports are all mapped to a portion of the M resource elements.

33. The apparatus of claim 32, wherein of M resource elements indexed k M through k M + M-1, resource elements indexed odd or even map the N DMRS ports, or M-P resource elements indexed smaller or larger map the N DMRS ports, 1 ≦ P ≦ M-1, and P is an integer, k ≦ 0,1,2, … ….

34. The apparatus according to any of claims 26 to 33, wherein the transceiver unit is further configured to:

sending the first indication information to the receiving end, or,

receiving the first indication information sent by the receiving end;

35. The apparatus of claim 34, wherein the first indication information further comprises time-frequency resource information for each of the at least one DMRS ports in a corresponding resource element.

36. The apparatus according to any of claims 26 to 35, wherein the transceiver unit is further configured to:

sending second indication information to the receiving end, or,

receiving the second indication information sent by the receiving end;

37. The apparatus of claim 36, wherein the second indication information may include any one of the following:

an index of the at least one resource unit in time and/or frequency domain;

odd or even resource elements;

38. The apparatus of any one of claims 26 to 37, wherein the mapping rule is further for indicating whether there is an offset for subcarriers used for mapping a same DMRS port in two groups of resource elements consecutive in time domain, and an offset if there is an offset, wherein the two groups of resource elements are located the same in frequency domain and each group of resource elements comprises M resource elements, there being one complete mapping of the N DMRS ports per group of resource elements; alternatively, the first and second electrodes may be,

39. A communications apparatus, comprising:

the device comprises a receiving and sending unit, a transmitting and receiving unit and a transmitting and receiving unit, wherein the receiving and sending unit is used for receiving a data channel, and the data channel bears data to be transmitted and a DMRS;

the processing unit is further configured to demodulate the data to be transmitted according to a correspondence between the at least one demodulation reference signal DMRS port and the at least one resource unit.

40. The apparatus according to claim 39, wherein at least two of the M resource elements have different numbers of DMRS ports, or any two of the M resource elements have the same number of DMRS ports; and/or the presence of a gas in the gas,

41. The apparatus of claim 39 or 40, wherein the M resource elements are contiguous in frequency domain or time domain.

42. The apparatus of claim 41, wherein each of the M resource elements corresponds to at least one of the N DMRS ports.

43. The apparatus of claim 42, wherein the correspondence of the N DMRS ports to resource elements is any one of:

44. The apparatus of claim 41, in which the N DMRS ports are all mapped to a portion of the M resource elements.

45. The apparatus of claim 43, wherein of M resource elements indexed k M through k M + M-1, resource elements indexed odd or even map the N DMRS ports, or M-P resource elements indexed smaller or larger map the N DMRS ports, 1 ≦ P ≦ M-1, and P is an integer, k ≦ 0,1,2, … ….

46. The apparatus according to any of claims 39 to 45, wherein the transceiver unit is further configured to:

sending first indication information to the sending end, or,

receiving the first indication information sent by the sending end;

47. The apparatus of claim 46, wherein the first indication information further comprises time-frequency resource information for each of the at least one DMRS ports in a corresponding resource element.

48. The apparatus according to any of claims 39 to 47, wherein the transceiver unit is further configured to:

sending second indication information to the sending end, or,

receiving the second indication information sent by the sending end;

49. The apparatus of claim 48, wherein the second indication information may include any one of the following:

an index of the at least one resource unit in time and/or frequency domain;

odd or even resource elements;

50. The apparatus of any one of claims 39 to 49, wherein the mapping rule is further for indicating whether there is an offset for subcarriers used for mapping a same DMRS port in two groups of resource elements consecutive in a time domain, and an offset if there is an offset, wherein the two groups of resource elements are located identically in a frequency domain and each group of resource elements includes M resource elements, there being one complete mapping of the N DMRS ports per group of resource elements; alternatively, the first and second electrodes may be,

51. A computer-readable medium, comprising a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 25.