CN107896389A

CN107896389A - A kind of method and apparatus for data transfer

Info

Publication number: CN107896389A
Application number: CN201610872812.4A
Authority: CN
Inventors: 窦圣跃; 王婷; 李元杰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-09-29
Filing date: 2016-09-29
Publication date: 2018-04-10

Abstract

The embodiment of the invention discloses a kind of method and apparatus for data transfer, and applied in the communication system including the network equipment and at least one terminal device, the predefined a variety of transmission plans having for data transfer, this method include in the communication system：The first Downlink Control Information DCI, the first DCI that first terminal equipment at least one terminal device receives network equipment transmission includes the configured information that the network equipment is the object transmission scheme that the first terminal equipment determines；The first terminal equipment determines the object transmission scheme according to the first DCI.

Description

Method and device for data transmission

Technical Field

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

Background

In the existing Long Term Evolution (LTE) protocol, the LTE is configured with ten Transmission Modes (TM), for example: transmit Diversity (Transmit Diversity), space division multiplexing, multi-User Multiple-Input Multiple-Output (MU-MIMO for short), coordinated Multiple Point (CoMP for short), and the like.

The network device determines to send downlink data to the terminal device through one of the ten transmission modes according to a current Channel state (for example, a Channel Quality Indicator (CQI) or the like). In the prior art, when a Radio Resource Control (RRC) connection is established by a terminal device (for example, the terminal device may initialize an LTE connection, switch to another LTE cell, reestablish an RRC connection due to a Radio link failure, or the like), a transmission mode configured by a network device for a certain terminal device notifies the terminal device of a currently used transmission mode through an RRC signaling. The terminal device first receives (or blindly detects) Downlink Control Information (DCI) corresponding to a transmission mode on a Physical Downlink Control Channel (PDCCH) according to the transmission mode indicated in the RRC signaling, and then receives Downlink data on a Physical Downlink Shared Channel (PDSCH) according to an indication of the DCI (for example, time-frequency resources indicating that the terminal device receives the Downlink data, and the like).

When the network device determines that it is necessary to switch the transmission mode according to the current channel condition, it is necessary to notify the terminal device through the reconfiguration RRC signaling, which requires several tens of milliseconds. Therefore, the network device causes a large delay in switching the transmission mode. Even when the current channel state is suitable for a higher-rate transmission mode (e.g., MIMO), a large time delay is required to switch to the higher-rate transmission mode, and it is difficult to adapt to a rapidly changing channel state, so that the network requirements of a future 5G system for lower delay and higher rate cannot be met.

Disclosure of Invention

The application provides a method for data transmission, so that indication information of a transmission scheme is carried through DCI, and time delay caused by indicating a transmission mode by sending a high-level RRC (radio resource control) signaling to terminal equipment can be reduced.

In a first aspect, a method for data Transmission is provided, which is applied in a communication system including a network device and at least one terminal device, in which a plurality of Transmission schemes (Transmission schemes) for data Transmission are predefined, and the method includes:

a first terminal device in the at least one terminal device receives first downlink control information DCI sent by the network device, where the first DCI includes indication information of a target transmission scheme determined by the network device for the first terminal device;

and the first terminal equipment determines the target transmission scheme according to the first DCI.

Therefore, the network device indicates the target transmission scheme to the terminal device through the physical layer signaling DCI, so that the terminal device can rapidly adjust the current transmission scheme based on the received DCI to adapt to the rapidly changing channel state, thereby reducing the large time delay brought by indicating the transmission mode through the high-layer RRC signaling in the prior art, and meeting the network requirements of the future 5G system for lower time delay and higher speed.

Here, it should be noted that, for convenience of differentiation and description, in the embodiment of the present invention, DCI for downlink scheduling is referred to as a first DCI, where the first DCI carries information related to downlink transmission; the DCI for uplink scheduling is denoted as a second DCI, and the second DCI carries information related to uplink transmission.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the first DCI further includes a field for carrying control information of each of the multiple transmission schemes,

the method further comprises the following steps:

and the first terminal equipment acquires target control information for the target transmission scheme from the first DCI according to the target transmission scheme.

The first DCI may include a plurality of control information fields, each of which carries different control information, and the control information carried by each of the control information fields may be used alone or in combination to adapt to different transmission schemes.

In one possible design, after the network device determines the target transmission scheme used by the first terminal device, the parameter may be configured in a field for carrying target control information, and a value in a field for carrying other control information may be null. After receiving the first DCI, the first terminal device may obtain the target control information from the first DCI according to the target transmission scheme determined for the first DCI by the network device.

In another possible design, after the network device determines the target transmission scheme used by the first terminal device, the terminal device may be instructed by the first DCI to interpret the received first DCI according to the indicated DCI format. That is, there is a one-to-one mapping relationship between a plurality of DCI formats and a plurality of transmission schemes. After receiving the first DCI, the terminal device may interpret the first DCI according to the indicated DCI format without considering values in other fields, thereby acquiring the target control information.

In summary, the first terminal device may obtain the required target control information from the first DCI according to the target transmission scheme determined by the network device, so as to transmit data with the network device based on the target transmission scheme.

Also, the payload size (payload size) and format of the first DCI may be fixed. In other words, the DCI for indicating the target transmission scheme, which is sent by the network device to the terminal device, may have a uniform format, and the DCI may be designed according to a maximum payload size including control information used in each of the plurality of transmission schemes.

Assuming that at least one terminal device in the communication system further includes a second terminal device, the payload sizes of the first DCI sent by the network device to the first terminal device and the payload sizes of the fourth DCI sent to the second terminal device are the same, and the formats of the first DCI and the fourth DCI are the same. The formats referred to herein are the same including: the fields included in the first DCI and the fourth DCI are the same, and the definition, size, and order of each field are the same. It should be noted that the definition of each field as referred to herein may be understood as the same type of control information carried by each field, but the content of the carried information (e.g., radio resource configuration parameters) may be the same or different.

With reference to the first aspect and the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the indication information of the target transmission scheme is carried in a first indication field in the first DCI, and,

the first terminal device determines the target transmission scheme according to the first DCI, including:

the first terminal device determines the target transmission scheme according to a target first information bit in the first indication field in the received first DCI and a first mapping relation, where the first mapping relation is used to indicate a one-to-one mapping relation between a plurality of first information bits and the plurality of transmission schemes.

With reference to the first aspect, in a third possible implementation manner of the first aspect, multiple Transmission modes (Transmission modes) for data Transmission are predefined in the communication system, each Transmission Mode includes at least one Transmission scheme, the multiple Transmission modes correspond to multiple DCI formats one-to-one, indication information of a target Transmission scheme determined by the network device for the first terminal device is carried in a second indication field in the first DCI, and,

the first terminal device determines the target transmission mode according to the received DCI format of the first DCI and a second mapping relation, wherein the second mapping relation is used for indicating a one-to-one mapping relation between the plurality of DCI formats and the plurality of transmission modes;

the first terminal device determines the target transmission scheme according to the target second information bit in the second indication field in the received first DCI and the third mapping relationship, where the third mapping relationship is used to indicate a one-to-one mapping relationship between a plurality of second information bits and a plurality of transmission schemes included in the target transmission mode.

With reference to the first aspect and the first possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, multiple transmission modes for data transmission are predefined in the communication system, each transmission mode includes at least one transmission scheme, indication information of a target transmission mode determined by the network device for the first terminal device is carried in a third indication field in the first DCI, indication information of a target transmission scheme determined by the network device for the first terminal device is carried in a second indication field in the first DCI, and,

the first terminal device determines a target transmission mode according to a third information bit in the third indication field in the received first DCI and a fourth mapping relation, where the fourth mapping relation is used to indicate a one-to-one mapping relation between a plurality of third information bits and the plurality of transmission modes;

the first terminal device determines the target transmission scheme according to a target second information bit in the second indication field in the received first DCI and a third mapping relation, where the third mapping relation is used to indicate a one-to-one mapping relation between a plurality of second information bits and a plurality of transmission schemes included in the target transmission mode.

It should be noted that, when the target transmission mode only includes one transmission scheme, the transmission scheme is the target transmission scheme. In this case, the base station may indicate only the target transmission mode of the first terminal device without indicating the target transmission scheme. The first terminal device may determine the target transmission scheme directly from the target transmission mode.

With reference to the first aspect and the foregoing possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, a plurality of aperiodic CSI reporting modes are predefined in the communication system, and each of the aperiodic CSI reporting modes can be applied to any one of the plurality of transmission schemes, and the method further includes:

the first terminal equipment receives second DCI sent by the network equipment, wherein the second DCI comprises a target reporting mode of aperiodic CSI determined by the network equipment for the first terminal equipment;

and the first terminal equipment determines the target reporting mode of the aperiodic CSI according to the second DCI.

Therefore, by releasing the binding relationship between the transmission mode and the aperiodic CSI reporting mode, the network device can dynamically instruct the terminal device to report the CSI based on any one of the predefined aperiodic CSI reporting modes according to the current channel state, so that the network device can adapt to the rapidly changing channel state, further realize the dynamic switching of the transmission scheme, and meet the network requirements of the future 5G system for lower delay and higher rate.

With reference to the first aspect and the foregoing possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the determining, by the first terminal device, a target reporting mode of the aperiodic CSI according to the second DCI includes:

and the first terminal equipment determines a target reporting mode of the aperiodic CSI according to a target fourth information bit in a fourth indication field in the received second DCI and a fifth mapping relation, wherein the fifth mapping relation is used for indicating a one-to-one mapping relation between a plurality of fourth information bits and the plurality of aperiodic CSI reporting modes.

With reference to the first aspect and the foregoing possible implementations of the first aspect, in a seventh possible implementation of the first aspect, the communication system predefines multiple periodic CSI reporting modes, and the method further includes:

the first terminal device receives third DCI sent by the network device, where the third DCI includes indication information of a target reporting mode of periodic CSI determined by the network device for the first terminal device;

the first terminal determines a target reporting mode of the periodic CSI according to a target fifth information bit in the fifth indication field in the received third DCI and the sixth mapping relationship, where the sixth mapping relationship is used to indicate a one-to-one mapping relationship between a plurality of fifth information bits and the plurality of periodic CSI reporting modes.

Therefore, the target reporting mode of the periodic CSI is indicated by the DCI, the periodic CSI reporting mode can be dynamically determined and indicated, and the method is suitable for the rapidly changing channel state, thereby realizing the dynamic switching of the transmission scheme.

The third DCI may be a DCI for uplink scheduling or a DCI for downlink scheduling. That is, the third DCI and the first DCI may be the same type of DCI, and may even be the same DCI; the third DCI and the second DCI may also be the same type of DCI, and may even be the same DCI. The present invention is not particularly limited in this regard.

With reference to the first aspect and the foregoing possible implementation manners of the first aspect, in an eighth possible implementation manner of the first aspect, a plurality of periodic CSI reporting modes are defined in the communication system, and the plurality of transmission schemes correspond to the plurality of periodic CSI reporting modes one to one, and the method further includes:

the first terminal device determines a target reporting mode of the periodic CSI, which is determined for the first terminal device by the network device, according to the target transmission scheme and a sixth mapping relationship, where the sixth mapping relationship is used to indicate a one-to-one mapping relationship between the multiple transmission schemes and the multiple periodic CSI reporting modes.

Therefore, the target reporting mode of the periodic CSI corresponding to the target transmission scheme is determined according to the corresponding relationship between the transmission scheme and the periodic CSI reporting mode, and the overhead caused by the fact that the DCI indicates the target reporting mode of the periodic CSI can be reduced. Meanwhile, the aperiodic CSI reporting mode is dynamically determined and indicated, so that the method can still adapt to the rapidly changing channel state and realize the dynamic switching of the transmission scheme.

In a second aspect, a method for reporting CSI is provided, which is applied in a communication system including a network device and at least one terminal device, where multiple transmission schemes and multiple aperiodic CSI reporting modes for data transmission are predefined in the communication system, and each aperiodic CSI reporting mode in the multiple aperiodic CSI reporting modes can be applied to any one of the multiple transmission schemes, the method including:

a first terminal device in the at least one terminal device receives a second DCI sent by the network device, where the second DCI includes a target reporting mode of an aperiodic CSI determined by the network device for the first terminal device;

With reference to the second aspect, in a first possible implementation manner of the second aspect, the determining, by the first terminal device, the target reporting mode of the aperiodic CSI according to the second DCI includes:

With reference to the second aspect and the first possible implementation manner of the second aspect, in a second possible implementation manner of the first aspect, multiple periodic CSI reporting modes are predefined in the communication system, and the method further includes:

the first terminal determines a target reporting mode of the periodic CSI according to a target fifth information bit in the fifth indication field in the received third DCI and a sixth mapping relationship, where the sixth mapping relationship is used to indicate a one-to-one mapping relationship between a plurality of fifth information bits and the plurality of periodic DCI reporting modes.

The third DCI may be a DCI for uplink scheduling or a DCI for downlink scheduling. That is, the third DCI and the first DCI may be the same type of DCI, and may even be the same DCI; the third DCI and the second DCI may also be the same type of DCI, and may even be the same DCI. With reference to the second aspect and the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, a plurality of periodic CSI reporting modes are defined in the communication system, and the plurality of transmission schemes correspond to the plurality of periodic CSI reporting modes one to one, and the method further includes:

Therefore, the target reporting mode of the periodic CSI corresponding to the target transmission scheme is determined according to the corresponding relationship between the transmission scheme and the periodic CSI reporting mode, so that the overhead caused by indicating the target reporting mode of the periodic CSI through the DCI can be reduced, and meanwhile, the aperiodic CSI reporting mode is dynamically determined and indicated, so that the rapid change channel state can still be adapted, and the dynamic switching of the transmission scheme is realized.

It is understood that the method provided by the second aspect may be implemented independently of the method provided by the first aspect, or may be combined with the method provided by the first aspect as needed, and is not described herein again.

In a third aspect, a method for data transmission is provided, which is applied in a communication system including a network device and at least one terminal device, in which a plurality of transmission schemes for data transmission are predefined, and the method includes:

the network device determines a target transmission scheme for a first terminal device of the at least one terminal device;

the network device sends first Downlink Control Information (DCI) to the first terminal device, wherein the first DCI comprises indication information of the target transmission scheme.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the first DCI further includes a field for carrying control information of each of the multiple transmission schemes.

With reference to the third aspect and the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the sending, by the network device, a first downlink control information DCI to the first terminal device, where the first DCI includes indication information of the target transmission scheme, includes:

the network equipment determines a target first information bit corresponding to the target transmission scheme according to a first mapping relation, wherein the first mapping relation is used for indicating a one-to-one mapping relation between a plurality of first information bits and the plurality of transmission schemes;

the network device sends the first DCI, where a first indication field in the first DCI carries the target first information bit.

With reference to the third aspect, in a third possible implementation manner of the third aspect, a plurality of transmission modes for data transmission are predefined in the communication system, each transmission mode including at least one transmission scheme, and,

before the network device determines the target transmission scheme for the first terminal device of the at least one terminal device, the method further comprises:

the network device determines a target transmission mode for the first terminal device, the target transmission mode including the target transmission scheme;

the network device sends a first DCI to the first terminal device, where the first DCI includes indication information of the target transmission scheme, and includes:

the network device determines a target DCI format corresponding to the target transmission mode according to a second mapping relation, wherein the second mapping relation is used for indicating a one-to-one mapping relation between the plurality of DCI formats and the plurality of transmission modes;

the network device determines a target second information bit corresponding to the target transmission scheme according to a third mapping relation, wherein the third mapping relation is used for indicating a one-to-one mapping relation between at least one second information bit and at least one transmission scheme included in the target transmission mode;

the network device sends the first DCI, wherein the first DCI is generated in the target DCI format, and a second indication field in the first DCI carries target second information bits.

With reference to the third aspect and the first possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, multiple transmission modes for data transmission are predefined in the communication system, each transmission mode includes at least one transmission scheme, and,

the network device determines a target third information bit corresponding to the target transmission mode according to the fourth mapping relationship, where the fourth mapping relationship is used to indicate a one-to-one mapping relationship between the plurality of third information bits and the plurality of transmission modes;

the network device sends the first DCI, where a third indication field in the first DCI carries the target third information bit, and a second indication field in the first DCI carries the target second information bit.

With reference to the third aspect and the foregoing possible implementation manners of the third aspect, in a fifth possible implementation manner of the third aspect, a plurality of aperiodic CSI reporting modes are predefined in the communication system, and each of the aperiodic CSI reporting modes can be applied to any one of the plurality of transmission schemes, and the method further includes:

the network equipment determines a target reporting mode of aperiodic CSI for the first terminal equipment;

and the network equipment sends a second DCI to the first terminal equipment, wherein the second DCI comprises a target reporting mode of the aperiodic CSI.

With reference to the third aspect and the foregoing possible implementation manners of the third aspect, in a sixth possible implementation manner of the third aspect, the sending, by the network device, a second DCI to the first terminal device, where the second DCI includes the target reporting mode of the aperiodic CSI includes:

the network equipment determines a target fourth information bit corresponding to the target reporting mode of the aperiodic CSI according to a fifth mapping relation, wherein the fifth mapping relation is used for indicating a one-to-one mapping relation between a plurality of fourth information bits and the plurality of aperiodic CSI reporting modes;

and the network equipment sends the second DCI to the first terminal equipment, and a fourth indication field in the second DCI carries the target fourth information bit.

With reference to the third aspect and the foregoing possible implementations of the third aspect, in a seventh possible implementation of the third aspect, the communication system predefines multiple periodic CSI reporting modes, and the method further includes:

the network equipment determines a target reporting mode of periodic CSI for the first terminal equipment;

the network device determines a target fifth information bit corresponding to the target reporting mode of the periodic CSI according to a sixth mapping relation, wherein the sixth mapping relation is used for indicating a one-to-one mapping relation between a plurality of fifth information bits and the plurality of periodic CSI reporting modes;

and the network equipment sends third DCI to the first terminal equipment, wherein a fifth indication field of the third DCI carries the target fifth information bit.

It should be noted that the third DCI and the first DCI may be the same DCI or different DCIs. If the third DCI is also a different DCI from the first DCI, the third DCI may also be a DCI used for uplink scheduling or downlink scheduling of the first terminal device. The present invention is not particularly limited in this regard.

With reference to the third aspect and the foregoing possible implementation manners of the third aspect, in an eighth possible implementation manner of the third aspect, multiple periodic CSI reporting modes are predefined in the communication system, and the multiple periodic CSI reporting modes are in one-to-one correspondence with the multiple transmission schemes.

In a fourth aspect, a method for reporting CSI is provided, where the method is applied in a communication system including a network device and at least one terminal device, multiple transmission schemes and multiple aperiodic CSI reporting modes are predefined in the communication system for data transmission, and each aperiodic CSI reporting mode in the multiple aperiodic CSI reporting modes can be applied to any one of the multiple transmission schemes, and the method includes:

and the network equipment sends a second DCI to the first terminal equipment, wherein the second DCI comprises a target reporting mode of the aperiodic CSI determined by the network equipment for the first terminal equipment.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the sending, by the network device, a second DCI to the first terminal device, where the second DCI includes a target reporting mode of the aperiodic CSI includes:

the network equipment determines a target fourth information bit corresponding to the target reporting mode of the aperiodic CSI according to a pre-configured fifth mapping relation, wherein the fifth mapping relation is used for indicating a one-to-one mapping relation between a plurality of fourth information bits and the plurality of aperiodic CSI reporting modes;

With reference to the fourth aspect and the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, multiple periodic CSI reporting modes are predefined in the communication system, and the method further includes:

the network equipment determines a target fifth information bit corresponding to a target reporting mode of the periodic CSI according to a pre-configured sixth mapping relation, wherein the sixth mapping relation is used for indicating a one-to-one mapping relation between a plurality of fifth information bits and the plurality of periodic CSI reporting modes;

With reference to the fourth aspect and the first possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, multiple periodic CSI reporting modes are predefined in the communication system, and the multiple periodic CSI reporting modes are in one-to-one correspondence with the multiple transmission schemes.

It is understood that the method provided in the fourth aspect may be implemented independently of the method provided in the second aspect, or may be combined with the method provided in the second aspect as needed, and is not described herein again.

In a fifth aspect, a terminal device is provided for performing the first aspect, any of the possible implementations of the first aspect, the second aspect, or the method in any of the possible implementations of the second aspect. In particular, the terminal device may comprise means for performing the method of the first aspect, any of the possible implementations of the first aspect, the second aspect, or any of the possible implementations of the second aspect.

A sixth aspect provides a network device for performing the third aspect or any of its possible implementations, the fourth aspect, or the method in any of its possible implementations. In particular, the network device may comprise means for performing the third aspect or any of its possible implementations, the fourth aspect, or the method in any of its possible implementations of the fourth aspect.

In a seventh aspect, a terminal device is provided, which includes a memory for storing instructions and a processor for executing the instructions stored in the memory, and the execution of the instructions stored in the memory causes the processor to execute the method in the first aspect, any possible implementation manner of the first aspect, the second aspect, or any possible implementation manner of the second aspect.

In an eighth aspect, a network device is provided, which includes a memory for storing instructions and a processor for executing the instructions stored in the memory, and the execution of the instructions stored in the memory causes the processor to perform the third aspect, any possible implementation manner of the third aspect, the fourth aspect, or the method in any possible implementation manner of the fourth aspect. In a ninth aspect, there is provided a computer readable storage medium for storing a computer program comprising instructions for performing any one of the method of the first to fourth aspects or any possible implementation of the first to fourth aspects.

Based on the above technical solution, the method and apparatus for data transmission provided by the present application can reduce the time delay caused by sending a high-level RRC signaling to a terminal device to indicate a transmission mode by using DCI to carry indication information of a transmission scheme.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic flow chart of a method for data transmission according to an embodiment of the present invention.

Fig. 2 is a schematic flow chart of a method for reporting CSI according to an embodiment of the present invention.

Fig. 3 is a schematic block diagram of a terminal device according to an embodiment of the present invention.

Fig. 4 is a schematic flow diagram of a network device according to an embodiment of the invention.

Fig. 5 is a schematic block diagram of a terminal device according to another embodiment of the present invention.

Fig. 6 is a schematic block diagram of a network device according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be understood that the solution of the present invention can be applied to various communication systems, such as: 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, an Advanced Long Term Evolution (LTE-a) System, a Universal Mobile Telecommunications System (UMTS), 5G, and the like.

Various embodiments are described herein in connection with a terminal device. A terminal device may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, and a terminal device in future 5G networks.

Furthermore, various embodiments are described herein in connection with a network device. The network device may be a device used for communicating with a mobile device, such as a network-side device, and the network-side device may be a Base station (BTS) in GSM or CDMA, a Base station (NodeB, NB) in wideband code division multiple access WCDMA, an evolved Node B (eNB, eNodeB) in LTE, a relay station, an access point, or a Radio Remote Unit (Remote Radio Unit, RRU), or a network-side device in a vehicle-mounted device, a wearable device, or a future 5G network. Optionally, the network device is a base station.

In addition, various aspects or features of the present invention 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.

It should be understood that, in the embodiment of the present invention, the numbers "first", "second", "third", "fourth", "fifth", "sixth", "seventh" are only used for distinguishing different objects, for example, for distinguishing different DCIs, different indication fields, different information bits, and the like, and should not limit the present invention in any way.

Hereinafter, for the sake of understanding, a Transmission Mode (TM) and a Transmission Scheme (Transmission Mode) will be briefly described.

When the terminal device accesses the cell covered by the base station through random access, it is configured with a Transmission Mode (TM) to help the terminal device process the data received on the PDSCH. The transmission mode that the base station configures for each terminal device depends on the capabilities of the terminal device, the capabilities of the base station, and the current channel state, among other things. Table 1 shows ten transmission modes in the LTE protocol and corresponding transmission schemes and DCI formats (DCI formats).

TABLE 1

It can be seen that in the existing LTE protocol, each transmission mode includes two transmission schemes, wherein, except for mode 1(TM 1), the other transmission modes include transmission schemes with transmission diversity, which are called fallback schemes. The fallback mode can be mainly used for the transmission scheme used when the channel state changes abruptly. The fallback mode may adopt a transmission scheme with higher reliability of transmission diversity, and besides the fallback mode, another transmission scheme in each transmission mode may be referred to as a primary transmission mode.

It should be noted that the Transmission Scheme described herein may be a Transmission Scheme (Transmission Scheme) defined in an existing protocol (for example, LTE protocol), or may be a Transmission Scheme defined in a related protocol in future 5G, and the present invention is not particularly limited thereto. It should be understood that the transmission scheme may be understood as a reference to a technical scheme used for transmitting data, and should not constitute any limitation to the present invention, and the present invention does not exclude the possibility of replacing the transmission scheme by other references in future protocols.

On the other hand, each transmission scheme also corresponds to one DCI format, and the DCI of each format carries control information required for transmitting data under the corresponding transmission scheme. Taking DCI 2C as an example, the control information included in the DCI 2C may include at least the following information:

1. carrier indicator (Carrier indicator);

2. resource block allocation (Resource block assignment);

3. transmission Power Control (TPC) for a Physical Uplink Control Channel (PUCCH);

4. a Downlink Assignment Index (DAI for short);

5. a Hybrid automatic repeat reQuest (HARQ) process number (process number);

6. an antenna port (antenna port), a scrambling value, and layer number information;

7. a Sounding Reference Signal (SRS) request;

8. modulation and Coding Scheme (MCS for short);

9. a new data indication for determining whether the current transmission is a new transmission or a retransmission;

10. a redundancy version number indicating a redundancy version of a current transmission.

It should be understood that the information included in the DCI 2C shown above is only an exemplary illustration, and should not limit the present invention in any way, and the information included in different DCI formats is different.

Through analysis, it can be found that the ten transmission modes defined in the LTE protocol overlap in a large part of functions, and therefore, simplification or unification can be performed.

In one possible design, the ten transmission modes may be directly divided into functionally non-overlapping transmission modes, for example, including: transmission diversity, Multiple-Input Multiple-Output (MIMO for short), Coordinated Multiple Points Transmission/Reception (CoMP for short), and the like. Different transmission schemes may be included in different transmission modes. Each transmission mode may include at least one transmission scheme. For example, in the transmission mode of the transmission diversity, a transmission diversity scheme based on a Space Frequency Block Code (SFBC) may be included; in the MIMO transmission mode, the MIMO transmission mode may include multi-User Multiple-input Multiple-output (MU-MIMO) and Single-User Multiple-input Multiple-output (SU-MIMO); in the transmission mode of the multipoint transmission, Coordinated Scheduling/Coordinated Beamforming (CS/CB), Joint Processing (JP), and the like may be included.

In another possible design, the base station may directly instruct the terminal device on the transmission scheme to use for transmitting data without using the transmission mode for differentiation. For example, the transmission scheme configured by the base station for the terminal device may include multiple transmission schemes such as the above-mentioned SFBC, MU-MIMO, SU-MIMO, CS/CB, JP, and so on.

It should be understood that the transmission schemes, the transmission modes, and the correspondence relationship with the transmission schemes listed above are only exemplary illustrations, and should not constitute any limitation to the present invention, nor should the present invention be limited thereto.

Based on this, the time delay caused by the base station when indicating the transmission mode to the terminal equipment through RRC signaling becomes a bottleneck of frequent and fast switching of the transmission scheme with fast change of the channel condition. Due to the network requirements of a future 5G system for lower delay and higher rate, the terminal device needs to switch the transmission scheme quickly according to the indication of the base station to adapt to the rapidly changing channel condition and correctly receive downlink data.

In view of this, the embodiments of the present invention provide a method for data transmission, which can indicate a transmission scheme through physical layer signaling, thereby greatly reducing a delay for configuring a transmission mode through higher layer RRC signaling. The method for transmitting data according to the embodiment of the present invention is described in detail below.

Fig. 1 shows a schematic flow diagram of a method 100 for data transmission according to an embodiment of the invention, described from the point of view of device interaction. The method 100 is applied to a communication system including a network device and at least one terminal device, wherein a plurality of transmission schemes are predefined in the communication system, and the network device can determine (or configure) a transmission scheme for current data transmission for any one terminal device in the at least one terminal device from the plurality of transmission schemes. In other words, the transmission scheme determined by the network device for each terminal device may be dynamically switched as the channel status changes. The transmission schemes determined by the network device for any two terminal devices in the at least one terminal device may be the same or different, and the present invention is not limited to this.

Optionally, the network device may be a base station, or may be other network devices that can be used for transmitting DCI, which is not particularly limited in the present invention

Hereinafter, the method for data transmission according to the embodiment of the present invention is described in detail by taking an example of interaction between a base station and a first terminal device without loss of generality. It should be understood that the first terminal device may be any one of the at least one terminal device, and the "first" is used for distinguishing and explaining only, and should not constitute any limitation to the present invention.

As shown in fig. 1, the method 100 includes:

s110, the base station determines a target transmission scheme for the first terminal equipment.

Specifically, after a first terminal device enters a cell through random access and establishes an RRC connection with a serving base station (i.e., an example of a network device) of the cell, the base station may configure a transmission scheme (referred to as a target transmission scheme for convenience of differentiation and description) for data transmission for the first terminal device according to a channel state with the first terminal device.

S120, the base station sends a first DCI to the first terminal device, where the first DCI includes indication information of a target transmission scheme.

In the embodiment of the present invention, the base station may carry the indication information of the target transmission scheme in physical layer signaling (e.g., DCI) to indicate the target transmission scheme used by the first terminal device for data transmission. Specifically, the base station transmits first DCI to the first terminal device.

Correspondingly, in S120, the first terminal device receives the first DCI, where the first DCI includes indication information of a target transmission scheme.

S130, the first terminal device determines a target transmission scheme according to the first DCI.

That is, the first terminal device interprets the first DCI according to a rule negotiated with the base station in advance, so that the target transmission scheme can be determined.

Here, for convenience of distinction and explanation, DCI including control information for downlink data transmission transmitted to a first terminal device is referred to as first DCI, and DCI including control information for downlink data transmission transmitted to a second terminal device is referred to as second DCI. In contrast, the DCI including the control information for uplink data transmission transmitted to the first terminal device is referred to as a third DCI.

In particular, the indication of the target transmission scheme may be accomplished by a number of possible implementations. Two more typical implementations (the first and second implementations) are described in detail below, but it should be understood that the implementations listed below are only exemplary and should not limit the present invention in any way. In the following, how the base station indicates the target transmission scheme through the first DCI (or how the first terminal device determines the target transmission scheme according to the first DCI) in the two implementations (the first and second implementations) is described in detail.

The first method is as follows:

the indication information of the target transmission scheme may be carried in a first indication field of the first DCI.

Optionally, S120 may specifically include:

the base station determines a target first information bit corresponding to a target transmission scheme according to a first mapping relation, wherein the first mapping relation is used for indicating a one-to-one mapping relation between a plurality of first information bits and a plurality of transmission schemes;

the base station sends a first DCI, and a first indication field in the first DCI carries the target first information bit.

Specifically, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship (for convenience of distinction and explanation, referred to as a first mapping relationship) of a plurality of transmission schemes with a plurality of information bits (for convenience of distinction and explanation, referred to as a first information bit) for indicating the transmission schemes, and a specific field (for convenience of distinction and explanation, referred to as a first indication field) for carrying information bits corresponding to indication information of the transmission schemes. After the base station determines a target transmission scheme for the first terminal device, according to the first mapping relationship, first information bits (for convenience of distinction and explanation, referred to as target first information bits) corresponding to the target transmission scheme are determined, and the target first information bits are carried in a first indication field in the first DCI.

Correspondingly, S130 may specifically include:

the first terminal device determines the target transmission scheme according to the target first information bit in the first indication field in the received first DCI and the first mapping relation, where the first mapping relation is used to indicate a one-to-one mapping relation between a plurality of first information bits and the plurality of transmission schemes.

Table 2 shows a mapping relationship (i.e., a first mapping relationship) of a plurality of transmission schemes with a plurality of first information bits.

TABLE 2

First information bit	Transmission scheme
		00	SFBC
01	MIMO
		10	Multi-point transmission
11	Retention (Reserved)

It can be seen that the first information bit carried by the first indication field shown in table 2 is a bit sequence with bit number 2. That is, 2 can be indicated²A transmission scheme. Table 2 further shows a one-to-one mapping of the plurality of first information bits to the plurality of transmission schemes. In this embodiment of the present invention, when the first indication field in the first DCI received by the first terminal device carries the target first information bit, which may be, for example, "01", the target transmission scheme may be determined to be MIMO according to the first mapping relationship.

It should be understood that table 2 shows an example of the mapping relationship between the plurality of first information bits and the plurality of transmission schemes for ease of understanding and explanation, and the specific contents of the first information bits, the specific contents of the transmission schemes, and the mapping relationship between the first information bits and the transmission schemes in the table are only for illustrative purposes and should not limit the present invention in any way. For example, the first information bit may be a bit sequence with a greater or lesser number of bits, and the transmission scheme may be other than the transmission scheme shown in table 2, which is not listed here for brevity. And, it can be understood that, when the kind of the transmission scheme is m, the number of bits of the first information bit indicating the transmission scheme may be mWherein,indicating rounding up.

Optionally, the first DCI further includes a field for carrying control information for each of the plurality of transmission schemes,

the method 100 further comprises:

In summary, the first terminal device only needs to obtain the required target control information from the first DCI according to the target transmission scheme determined for the first terminal device by the network device, and can transmit data with the network device based on the target transmission scheme. Further, the payload size (payload size) and format of the first DCI may be fixed. In other words, the DCI for indicating the target transmission scheme, which is sent by the network device to the terminal device, may have a uniform format, and the DCI may be designed according to a maximum payload size including control information used in each of the plurality of transmission schemes.

Assuming that at least one terminal device in the communication system further includes a second terminal device, the payload sizes of the first DCI sent by the base station to the first terminal device and the payload sizes of the fourth DCI sent to the second terminal device are the same, and the formats of the first DCI and the fourth DCI are the same.

Here, it should be noted that the formats are the same, and it is understood that the fields included in the first DCI and the definition, size, and order of each field are the same as those included in the fourth DCI and the definition, size, and order of each field are the same. It should be noted that the definition of each field as referred to herein may be understood as the same type of control information carried by each field, but the content of the carried information (e.g., radio resource configuration parameters) may be the same or different.

Specifically, in the first DCI, in addition to the information of the first indication field, a control information field may be included, where the control information field carries control information for downlink data transmission. By way of example and not limitation, the control information may include at least the following information:

1. carrier indicator (Carrier indicator);

2. a centralized (Localized)/Distributed (Distributed) Virtual resource block (Virtual RecourseBlock, referred to as VRB for short) allocation identifier;

3. resource block allocation (Resource block assignment);

4. transmit Power Control (TPC) for PUCCH;

5. a Downlink Assignment Index (DAI);

6. a hybrid automatic repeat request (HARQ) process number (process number);

7. antenna port, scrambling value and layer number information;

8. a sounding signal (SRS) request;

9. modulation Coding Scheme (MCS);

10. a new data indication for determining whether the current transmission is a new transmission or a retransmission;

11. a redundancy version number indicating a redundancy version of a current transmission.

It can be seen that the control information may include control information for downlink data transmission under the multiple transmission schemes, and is not limited to the control information for downlink data transmission under the target transmission scheme. The first terminal device may acquire control information for the current transmission scheme (i.e., the target transmission scheme) from the control information field according to the target transmission scheme (for convenience of distinction and explanation, referred to as target control information).

It should be understood that the above listed control information is only an exemplary illustration, and should not constitute any limitation to the present invention, and the present invention should not be limited thereto. Embodiments of the present invention may also include other control information for data transmission than those listed above.

Optionally, the base station and the first terminal device may negotiate a one-to-one mapping relationship between a plurality of first information bits and a plurality of DCI formats in advance. Meanwhile, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship between multiple transmission schemes and multiple DCI formats.

Table 3 shows a one-to-one mapping relationship of a plurality of DCI formats and a plurality of first information bits, which correspond one-to-one to a plurality of transmission schemes.

TABLE 3

It should be noted that the one-to-one mapping relationship between the multiple DCI formats and the multiple first information bits herein does not mean that the DCI transmitted by the base station to the terminal device is generated in the corresponding DCI format, but instructs the terminal device to decode the received DCI according to the DCI format to obtain the target control information. For example, if a first terminal device receives a first DCI, where a first indication field carries a target first information bit "01", the first DCI is interpreted according to a format region of DCI 2, so that target control information required for transmitting data in a transmission scheme corresponding to the DCI format may be acquired.

Therefore, when receiving the first DCI, the first terminal device may determine the corresponding DCI format according to the target first information bit carried by the first indication field in the first DCI, so as to determine a target transmission scheme and an interpretation mode of control information required when the first terminal device transmits downlink data using the target transmission scheme, and further obtain target control information required when the first terminal device transmits the downlink data using the target transmission scheme.

The specific procedure of the first mode directly indicating the transmission scheme by the first information bit is described in detail above, and the second mode is described in detail below.

The second method comprises the following steps:

a plurality of transmission modes for data transmission may be predefined in the communication system, each transmission mode comprising at least one transmission scheme. The base station may configure a transmission mode (referred to as a target transmission mode for convenience of differentiation and description) for the first terminal device, and then configure a target transmission scheme for the first terminal device from at least one transmission scheme included in the target transmission mode. That is, the target transmission mode includes the target transmission scheme.

Specifically, the base station may indicate the target transmission mode and the target transmission scheme to the first terminal device in the following two ways (including way two a and way two b).

Hereinafter, the second method a and the second method b will be described in detail.

The second method a:

the base station may indicate different transmission modes using different DCI formats, and after determining the target transmission mode for the first terminal device, may generate the first DCI in the corresponding DCI format. After the target transmission mode is determined, a target transmission scheme is further determined from at least one transmission scheme included in the target transmission mode, and the indication information of the target transmission scheme may be carried in a specific indication field (for convenience of distinction and explanation, referred to as a second indication field) in the first DCI.

Optionally, before S110, the method 100 further includes:

the base station determines a target transmission mode for the first terminal device, the target transmission mode comprising the target transmission scheme;

s120 may specifically include:

the base station determines a target DCI format corresponding to the target transmission mode according to a second mapping relation, wherein the second mapping relation is used for indicating a one-to-one mapping relation between the plurality of DCI formats and the plurality of transmission modes;

the base station determines a target second information bit corresponding to the target transmission scheme according to the third mapping relation, wherein the third mapping relation is used for indicating a one-to-one mapping relation between at least one second information bit and at least one transmission scheme included in the target transmission mode;

the base station transmits the first DCI, the first DCI is generated in the target DCI format, and a second indication field in the first DCI carries target second information bits.

Specifically, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship (denoted as a second mapping relationship for ease of distinction and explanation) between a plurality of transmission modes and a plurality of DCI formats, a mapping relationship (denoted as a third mapping relationship for ease of distinction and explanation) between at least one transmission scheme included in each transmission mode and information bits (denoted as second information bits for ease of distinction and explanation) for indicating the transmission scheme, and a specific field (denoted as a second indication field for ease of distinction and explanation) for carrying the second information bits.

That is, although the DCI formats are different, the second indication field may be included in DCI generated in different DCI formats to carry the second information bit to indicate a transmission mode.

In the embodiment of the present invention, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship between at least one transmission scheme included in each of the plurality of transmission modes and at least one second information bit. In different transmission modes, even if the bit sequence of the second information bit is the same, the corresponding transmission schemes are different.

After determining the target transmission mode and the target transmission scheme for the first terminal device, the base station may generate a first DCI according to the corresponding DCI format, and carry a target second information bit in a second indication field in the first DCI, thereby sending the first DCI to the first terminal device.

Correspondingly, S130 may specifically include:

The first terminal device may determine the target transmission mode according to the DCI format of the first DCI according to the second mapping relationship negotiated in advance, and further determine the target transmission scheme from the target second information bit carried by the second indication field in the first DCI according to the third mapping relationship negotiated in advance.

Table 4 shows a mapping relationship (i.e., a second mapping relationship) of a plurality of transmission modes with a plurality of DCI formats, and a mapping relationship (i.e., a third mapping relationship) of at least one transmission scheme with at least one second information bit in the plurality of transmission modes.

TABLE 4

It can be seen that four transmission modes, transmission mode a, transmission mode B, transmission mode C and transmission mode D, may be negotiated in advance in the base station and the first terminal device. Each transmission mode includes at least one transmission scheme, e.g., transmission mode a includes transmission scheme 1 and transmission scheme 2; transmission mode B includes transmission scheme 3, transmission scheme 4, transmission scheme 5, and transmission scheme 6; transmission mode C includes transmission scheme 7; transmission mode D includes transmission scheme 8 and transmission scheme 9.

The first and second columns in table 4 show a one-to-one mapping relationship of DCI formats (including DCI format A, DCI format B, DCI format C and DCI format D) and transmission modes (including transmission mode a, transmission mode B, transmission mode C and transmission mode D). The third and fourth columns in table 4 show a one-to-one mapping of the at least one second information bit to the at least one transmission scheme. When the transmission modes are different, the transmission schemes corresponding to the second information bits with the same content are also different. Specifically, the transmission mode a may include transmission scheme 1 and transmission scheme 2, which may be indicated by the second information bits "00" and "01", respectively; transmission mode B may include transmission scheme 3, transmission scheme 4, transmission scheme 5, and transmission scheme 6, which may be indicated by second information bits "00", "01", "10", and "11", respectively; transmission mode C may include transmission scheme 7, which may be indicated by a second information bit "00"; the transmission mode D may include the transmission scheme 8, which may be indicated by the second information bits "00" and "10".

It should be understood that the one-to-one mapping relationship between the transmission mode and the DCI format listed in table 4, and the one-to-one mapping relationship between the transmission scheme and the second information bit included in each transmission mode are only exemplary, and should not limit the present invention in any way.

For example, when the first terminal device detects that the DCI format of the first DCI is DCI format a, it may determine that the target transmission mode determined by the base station for the first terminal device is transmission mode a, and therefore, the target transmission scheme may be determined according to a mapping relationship between the transmission scheme included in transmission mode a and the second information bits (for convenience of differentiation and description, referred to as target second information bits) in the second indication field in the first DCI. If the first terminal device detects that the target second information bit in the second indication field in the first DCI is "01", it may be determined that the target transmission scheme determined by the base station for the first terminal device is transmission scheme 2.

It should be understood that the above examples are illustrative only for the purpose of understanding, and are not to be construed as limiting the invention in any way.

Further, control information (i.e., target control information) required for data transmission using the target transmission scheme may also be included in the first DCI.

In the embodiment of the present invention, the DCI transmitted by the base station to the terminal device may be generated according to a DCI format corresponding to a transmission mode. Since the DCI formats are in one-to-one correspondence with the transmission modes, that is, the DCI formats corresponding to different transmission modes are different, the payload sizes may also be different. Therefore, in the DCI transmitted to each terminal device, the included control information may be different, for example, for transmission scheme 1 in the transmission mode a determined by the base station for the first terminal device, the base station may carry the control information required for data transmission under the transmission scheme (i.e., transmission scheme 1) in the control information field of the first DCI, but need not carry the control information required for data transmission under other transmission schemes (e.g., transmission scheme 5) in the control information field of the first DCI. In other words, the control information field may carry only the target control information, so that unnecessary overhead may be reduced.

In this case, the first terminal device may directly read the control information field and obtain the target control information for data transmission, without the base station indicating the interpretation manner of the control information field to the first terminal device.

Mode two b:

the base station may also indicate different transmission modes through different information bits (for convenience of differentiation and description, referred to as third information bits) carried by a specific indication field (for convenience of differentiation and description). That is, the indication information of the target transmission mode may be carried in the third indication field in the first DCI. Meanwhile, the indication information of the target transmission scheme may be carried in a second indication field in the first DCI.

Optionally, before S110, the method 100 further includes:

the base station determines a target transmission mode for the first terminal device, the target transmission mode comprising the target transmission scheme.

S120 may specifically include:

the base station determines a target third information bit corresponding to the target transmission mode according to a fourth mapping relation, wherein the fourth mapping relation is used for indicating a one-to-one mapping relation between the plurality of third information bits and the plurality of transmission modes;

the base station sends the first DCI, wherein a third indication field in the first DCI carries the target third information bit, and a second indication field in the first DCI carries the target second information bit.

Specifically, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship (for convenience of distinction and explanation, referred to as a fourth mapping relationship) of a plurality of transmission modes with a plurality of information bits (for convenience of distinction and explanation, referred to as a third information bit) for indicating the transmission modes, a one-to-one mapping relationship (for convenience of distinction and explanation) of at least one transmission scheme included in each transmission mode with information bits (i.e., the above-described second information bits) for indicating the transmission scheme, and a specific field (i.e., the above-described second indication field) for carrying the second information bits and a specific field (i.e., the above-described third indication field) for carrying the third information bits.

After determining the target transmission mode and the target transmission scheme for the first terminal device, the base station may carry a target third information bit in the third indication field and a target second information bit in the second indication field according to the fourth mapping relationship and the third mapping relationship, and further send the first DCI to the first terminal device.

Correspondingly, S130 may specifically include:

the first terminal device determines a target transmission mode according to a third information bit in the second indication field in the received first DCI and the fourth mapping relation, where the fourth mapping relation is used to indicate a one-to-one mapping relation between a plurality of third information bits and the plurality of transmission modes;

the first terminal device determines the target transmission scheme according to a target second information bit in the third indication field in the received first DCI and a third mapping relation, where the third mapping relation is used to indicate a one-to-one mapping relation between a plurality of second information bits and a plurality of transmission schemes included in the target transmission mode.

The first terminal device may determine the target transmission mode according to a pre-negotiated fourth mapping relationship and a target third information bit carried by a third indication field in the first DCI, and further determine the target transmission scheme from a target second information bit carried by a second indication field in the first DCI according to a pre-negotiated third mapping relationship.

Table 5 shows a one-to-one mapping relationship (i.e., a fourth mapping relationship) of a plurality of transmission modes with a plurality of third information bits, and a mapping relationship (i.e., a third mapping relationship) of at least one transmission scheme with at least one second information bit in the plurality of transmission modes.

TABLE 5

Wherein the first and second columns of table 5 show a one-to-one mapping relationship of the plurality of third information bits and the plurality of transmission modes. The third and fourth columns in table 5 show a one-to-one mapping of at least one transmission scheme to at least one second information bit.

It should be understood that, for the specific analysis of the mapping relationship between each third information bit and the transmission mode, each second information bit and the transmission scheme in table 5, and the specific process of the first terminal device determining the target transmission scheme according to the fourth mapping relationship, the third mapping relationship, and the first DCI, reference may be made to the method in method two a, and details are not repeated here for brevity.

It should be further understood that the one-to-one mapping relationship between the transmission mode and the third information bit listed in table 5, and the one-to-one mapping relationship between the transmission scheme included in each transmission mode and the second information bit are only exemplary, and should not limit the present invention in any way.

It should be noted that, when the target transmission mode (for example, the transmission mode C) includes only one transmission scheme (for example, the transmission scheme 7), the transmission scheme is the target transmission scheme. In this case, the base station may indicate only the target transmission mode of the first terminal device without indicating the target transmission scheme.

Specifically, a one-to-one mapping relationship between transmission modes and transmission schemes may be negotiated in advance between the base station and the first terminal device, and when the base station determines that the target transmission mode is transmission mode C for the first terminal device, a third information bit (for example, "10") corresponding to the transmission mode C may be carried in a third indication field, or the first DCI may be generated in a DCI format (for example, DCI format C) corresponding to the transmission mode C and then sent to the first terminal device. After determining that the target transmission mode is transmission mode C, the first terminal device may determine that the target transmission scheme is transmission scheme 7 according to a one-to-one mapping relationship between the transmission mode and the transmission scheme negotiated in advance.

This method is particularly applicable to the case where different transmission schemes are indicated by different DCI formats in method two a. When the target transmission mode includes only one transmission scheme, the base station may directly no longer indicate the target transmission scheme through the information bits, thereby reducing overhead of the information bits.

Optionally, in this embodiment of the present invention, the payload size of the first DCI sent by the base station to the first terminal device is the same as the payload size of the second DCI sent by the base station to the second terminal device, and the payload sizes are the same.

Or, the DCI transmitted by the base station to any two terminal devices in the cell may be DCI with the same payload size and the same format.

It should be understood that, in the method one, a specific method for carrying control information through DCI with the same payload size and the same format and a specific method for acquiring target control information according to a target transmission scheme have been described in detail, and details are not repeated here for brevity.

Through the first method and the second method (including the second method a and the second method b), the base station indicates the target transmission scheme to the first terminal device by sending the first DCI, and the first terminal device may determine the target transmission scheme according to a pre-negotiated rule and acquire target control information required when data transmission is performed using the target transmission scheme, so that the first terminal device may perform S140, and the first terminal device transmits data with the base station using the target transmission scheme. Specifically, the first terminal device receives downlink data sent by the base station based on the target transmission scheme.

Therefore, the method for data transmission according to the embodiment of the present invention indicates a target transmission scheme and target control information required for data transmission using the target transmission scheme to a terminal device through a DCI, so that the terminal device can quickly adjust a current transmission scheme based on the received DCI to adapt to a current channel condition, and further adapt to a quickly changing channel state, thereby reducing a large delay caused by indicating a transmission mode through a high-level RRC signaling in the prior art, and thus being capable of meeting network requirements of a future 5G system for lower delay and higher rate.

It should be understood that the information bits (including the first information bit, the second information bit, and the third information bit) in the above example are only illustrated by taking a 2-bit sequence as an example, and should not limit the present invention in any way, and the number of bits of the first indication field, the second indication field, and the third indication field for carrying the first information bit, the second information bit, and the third information bit, respectively, may be determined according to the number of transmission schemes and the number of transmission modes corresponding to the information bits.

On the other hand, in the current technology, a periodic (periodic) Channel State Information (CSI) reporting mode, an aperiodic CSI reporting mode, and a transmission mode respectively have a corresponding relationship (or the periodic CSI reporting mode and the aperiodic CSI reporting mode are respectively bound to the transmission mode). For example, one transmission mode corresponds to at least one periodic CSI reporting mode and at least one aperiodic CSI reporting mode, respectively. After determining the transmission mode for the first terminal device, the base station may use the periodic CSI reporting mode and the aperiodic CSI reporting mode corresponding to the transmission mode to perform CSI reporting.

Table 6 shows the correspondence between the ten transmission modes in the LTE protocol and the periodic CSI reporting mode and the aperiodic CSI reporting mode.

TABLE 6

It can be seen that each of the ten Transmission Modes (TM) defined in the LTE protocol corresponds to more than two periodic CSI reporting modes and aperiodic CSI reporting modes. However, in some transmission Modes, for example, in the transmission mode of TM2, only the aperiodic CSI reporting mode of Modes 2-0, 1-0, 3-0 without feeding back a Precoding Matrix Indicator (PMI) can be triggered, but the aperiodic CSI reporting Modes such as Modes 3-1, 3-2 with feeding back a PMI cannot be triggered, so that it cannot be probed whether the current channel condition can be used for MIMO transmission with higher data rate in the transmission mode of TM 2. Similarly, in the TM2 transmission mode, only the periodic CSI reporting mode of the Modes 1-0 and 2-0 that do not feed back the PMI can be triggered, but the periodic CSI reporting mode of the Modes 1-1 and 2-1 that feed back the PMI cannot be triggered.

In the embodiment of the present invention, the base station determines the target reporting mode of aperiodic CSI for the first terminal device, and may also indicate the target reporting mode of aperiodic CSI, which is determined by the base station for the first terminal device, through physical layer signaling.

It should be noted that the aperiodic CSI reporting mode may no longer have a corresponding relationship (or a binding relationship) with the transmission mode or the transmission scheme in the embodiment of the present invention (i.e., described above), and may be dynamically adjusted by the base station according to the channel condition to adapt to the rapid change of the channel. That is, multiple aperiodic CSI reporting modes may be predefined in the communication system, and each reporting mode can be applied to any one of multiple predefined transmission schemes in the communication system.

On the other hand, the periodic CSI reporting mode may continue to maintain the binding relationship with the transmission scheme, and in this case, the base station does not need to indicate the target reporting mode of the periodic CSI for the first terminal device; or, the periodic CSI reporting mode may also cancel the binding relationship with the transmission scheme, and in this case, the base station may also determine the target reporting mode of the periodic CSI for the first terminal device, and indicate the target reporting mode of the periodic CSI to the first terminal device through the DCI.

The following describes in detail a specific process of the base station determining and indicating the periodic CSI target reporting mode and the aperiodic CSI target reporting mode for the first terminal device.

It should be noted that the Channel State Information (CSI) may include, for example, a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), a Channel Quality Indicator (CQI), and the like. The CQI may be used to reflect Channel quality of the PDSCH, and the terminal may send the CQI to the base station on a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH); the RI is used to indicate the number of valid data layers of the PDSCH, i.e., the terminal device tells the base station the number of data streams that can be supported now; the PMI may be used to indicate an Index (Index) of a codebook set for precoding in a closed-loop spatial multiplexing transmission scheme.

In a possible implementation manner, the base station may determine a target reporting mode of the periodic CSI for the first terminal device, and send, to the first terminal device, a third DCI type including indication information of the target reporting mode of the periodic CSI at the base station. And the first terminal equipment determines a target reporting mode of the periodic CSI according to the third DCI.

Optionally, the method 100 further comprises:

s150, the base station sends a third DCI to the first terminal device, where the third DCI includes a target reporting mode of the periodic CSI determined by the base station for the first terminal device.

S160, the first terminal device determines a target reporting mode of the periodic CSI according to the third DCI.

S170, the first terminal device reports the CSI based on the periodic CSI target reporting mode.

Specifically, the base station may determine the target reporting mode of the periodic CSI for the first terminal device according to the current channel state, the data transmission accuracy, and other factors. The base station determines the target reporting mode of the periodic CSI for the first terminal device, and may indicate the target reporting mode by using information bits (for convenience of distinguishing and describing, referred to as fifth information bits) carried in a specific field (for convenience of distinguishing and describing, referred to as fifth indication field) in the third DCI. In this case, the periodic CSI reporting mode has no binding relationship with the transmission scheme.

Optionally, S150 may specifically include:

the base station determines a target reporting mode of periodic CSI for the first terminal equipment;

the base station determines a target fifth information bit corresponding to the target reporting mode of the periodic CSI according to a sixth mapping relation, wherein the sixth mapping relation is used for indicating a one-to-one mapping relation between a plurality of fifth information bits and the plurality of periodic CSI reporting modes;

and the base station sends third DCI to the first terminal equipment, and a fourth indication field of the third DCI carries the target fifth information bit.

Correspondingly, S160 may specifically include:

the first terminal equipment receives third DCI sent by the base station, wherein the third DCI comprises indication information of a target reporting mode of periodic CSI determined by the base station for the first terminal equipment;

Specifically, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship between multiple periodic CSI reporting modes and multiple fifth information bits (for convenience of differentiation and description, referred to as a sixth mapping relationship). The base station may carry, according to the sixth mapping relationship, a target fifth information bit for indicating a target reporting mode of the periodic CSI in a fifth indication field in the third DCI. After receiving the third DCI, the first terminal device may determine a target reporting mode of the periodic CSI according to a sixth mapping relationship by interpreting a target fifth information bit in a fifth indication field therein.

Table 7 shows a one-to-one mapping relationship between multiple periodic CSI reporting modes and multiple fifth information bits.

TABLE 7

Fifth information bit	Periodic CSI reporting mode
		00	Mode 1-0
01	Mode 1-1
		10	Mode 2-0
11	Mode 2-1

It can be seen that four periodic CSI reporting modes in the LTE protocol can be indicated by a bit sequence of two bits. It should be understood, however, that this should not be construed as limiting the invention in any way, and that the invention does not exclude the possibility of defining more or less periodic CSI reporting modes in the future, and indicating them by a more or less bit sequence.

It should be noted that the third DCI and the first DCI may be the same DCI or different DCIs. If the third DCI is also different from the first DCI, the third DCI may also be a DCI for uplink scheduling or downlink scheduling of the first terminal device. The present invention is not particularly limited in this regard.

Optionally, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship between a plurality of RRC-configured CSI parameter sets and a plurality of fifth information bits. Meanwhile, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship between multiple periodic CSI reporting modes and multiple RRC-configured CSI parameter sets.

Table 8 shows a one-to-one mapping relationship between a plurality of parameter sets and a plurality of fifth information bits, which correspond to a plurality of periodic CSI reporting modes one to one.

TABLE 8

Here, it should be noted that the CSI parameter set configured by the RRC may be understood as parameters, such as time-frequency resources, periods, and frequency shifts, configured by the network device (e.g., the base station) for the terminal device through RRC signaling and used for reporting CSI. And reporting the CSI by different configured CSI parameter sets in different periodical CSI reporting modes.

Therefore, when receiving the third DCI, the first terminal device may determine a corresponding target parameter group according to a target fifth information bit carried by a fifth indication field in the third DCI, so as to determine a target reporting mode of the periodic CSI, and further report the CSI based on the uplink resource configured by the target parameter group.

In another possible implementation manner, the base station and the first terminal device may negotiate a one-to-one mapping relationship between the transmission scheme and the periodic CSI reporting mode in advance, and after the first terminal device receives the first DCI and determines the target transmission scheme, the first terminal device may determine the target reporting mode of the periodic CSI according to the target transmission scheme.

Optionally, multiple periodic CSI reporting modes are predefined in the communication system, and the multiple periodic CSI reporting modes correspond to the multiple transmission schemes one to one.

The method 100 further comprises:

the first terminal device determines a target reporting mode of periodic CSI determined by the base station for the first terminal device according to the target transmission scheme and a seventh mapping relationship, and reports CSI to the base station based on the target reporting mode of the periodic CSI, wherein the seventh mapping relationship is used for indicating a one-to-one mapping relationship between the multiple transmission schemes and the multiple periodic CSI reporting modes.

Specifically, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship between multiple transmission schemes and multiple periodic CSI reporting modes (for convenience of differentiation and description, the mapping relationship is referred to as a seventh mapping relationship). The first terminal device may determine a target transmission scheme according to the first DCI, determine a target reporting mode of the periodic CSI determined by the base station for the first terminal device according to the seventh mapping relationship, and report the CSI based on the target reporting mode of the periodic CSI.

And, the base station may also send, to the first terminal device, the indication information indicating the target parameter group of the uplink resource for reporting the CSI via the third DCI. The specific method for the base station to indicate the parameters for CSI reporting has been described in detail in the foregoing with reference to table 8, and is not described again here for brevity.

Optionally, the method 100 further comprises:

s180, the base station determines a target reporting mode of aperiodic CSI for the first terminal equipment;

s190, the base station sends second DCI to the first terminal device, wherein the second DCI comprises indication information of a target reporting mode of the aperiodic CSI determined by the base station for the first terminal device;

s200, the first terminal equipment determines a target reporting mode of aperiodic CSI according to the second DCI;

s210, the first terminal device reports the CSI based on the aperiodic CSI target reporting mode.

Specifically, the base station may determine a target reporting mode of aperiodic CSI for the first terminal device according to current channel state information (e.g., CQI, etc.) between the base station and the first terminal device and a correct rate of data transmission, and send indication information of the target reporting mode to the first terminal device through the third DCI.

Optionally, S190 may specifically include:

the base station determines a target fourth information bit corresponding to the target reporting mode of the aperiodic CSI according to the fifth mapping relation, wherein the fifth mapping relation is used for indicating a one-to-one mapping relation between a plurality of fourth information bits and the plurality of aperiodic CSI reporting modes;

and the base station sends second DCI to the first terminal equipment, and a fourth indication field of the second DCI carries the target fourth information bit.

Correspondingly, S200 may specifically include:

the first terminal device determines a target reporting mode of aperiodic CSI according to a target fourth information bit in a fourth indication field in the received second DCI and a fifth mapping relationship, and reports the CSI based on the target reporting mode of aperiodic CSI, where the fifth mapping relationship is used to indicate a one-to-one mapping relationship between a plurality of fourth information bits and the plurality of aperiodic CSI reporting modes.

Specifically, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship (for convenience of differentiation and description, referred to as a fifth mapping relationship) between multiple aperiodic CSI reporting modes and multiple information bits (for convenience of differentiation and description, referred to as fourth information bits) for indicating the aperiodic CSI reporting modes, and a specific field (for convenience of differentiation and description, referred to as a fourth indication field) in the second DCI for carrying the fourth information bits.

After determining the target reporting mode of aperiodic CSI for the first terminal device, the base station may carry a target fourth information bit in a fourth indication field according to the fifth mapping relationship, and further send the second DCI to the first terminal device, so that the first terminal device determines the target reporting mode of aperiodic CSI.

Here, it should be noted that the second DCI is control information different from the first DCI and the fourth DCI described above, specifically, the first DCI and the fourth DCI are DCI for downlink scheduling of the first terminal device and the second terminal device, respectively, and the second DCI is DCI for uplink scheduling of the first terminal device.

It should be understood that the "first DCI", "second DCI", "third DCI", and "fourth DCI" are only to distinguish different DCIs, and should not constitute any limitation on the functions thereof, and the embodiments of the present invention should not be limited thereto. For example, the first DCI may be a DCI for uplink scheduling of the first terminal device, and the second DCI may be a DCI for downlink scheduling of the first terminal device, which is not particularly limited in the present invention.

Table 9 shows a one-to-one mapping relationship (i.e., a fifth mapping relationship) between a plurality of aperiodic CSI reporting modes and a plurality of fourth information bits.

TABLE 9

Fourth information bit	Aperiodic CSI reporting mode
		000	Mode 1-0
001	Mode 2-0
		010	Mode 3-0
011	Mode 1-1
		100	Mode 3-1
101	Mode 1-2
		110	Mode 2-2
111	Mode 2-3

It can be seen that eight aperiodic CSI reporting modes in the LTE protocol can be indicated by a bit sequence of three bits. It should be understood, however, that this should not be construed as limiting the invention in any way, and that the invention does not exclude the possibility of defining more or less periodic CSI reporting modes in the future, and indicating them by a more or less bit sequence.

Optionally, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship between a plurality of RRC-configured CSI parameter sets and a plurality of fourth information bits (see table 8). Meanwhile, the base station and the first terminal device may negotiate in advance a one-to-one mapping relationship between multiple periodic CSI reporting modes and multiple RRC-configured CSI parameter sets. When receiving the second DCI, the first terminal device may determine a corresponding target parameter group according to a target fourth information bit carried by a fourth indication field in the second DCI, thereby determining a target reporting mode of aperiodic CSI, and further reporting CSI based on uplink resources configured by the target parameter group.

It should be understood that the one-to-one mapping relationship between the multiple RRC-configured CSI parameter sets and the multiple fourth information bits is similar to the one-to-one mapping relationship between the multiple RRC-configured CSI parameter sets and the multiple fifth information bits described above (i.e., as shown in table 8), and the method for the first terminal device to determine the target reporting mode and the target parameter set of the aperiodic CSI according to the mapping relationship is also similar to the method for determining the target reporting mode and the target parameter set of the periodic CSI described above, and therefore, for brevity, no further description is provided here.

Here, it should be noted that, after determining the target reporting mode of the periodic CSI for the first terminal device, the base station may further determine the target reporting mode of the aperiodic CSI for the first terminal device. Therefore, the base station may determine, for the first terminal device, a target reporting mode of aperiodic CSI that is different from the target reporting mode of periodic CSI.

Therefore, the method for data transmission according to the embodiment of the present invention indicates the target transmission scheme and the target control information required for data transmission using the target transmission scheme to the terminal device through the DCI, so that the terminal device can quickly adjust the current transmission scheme based on the received DCI to adapt to the current channel condition, and further adapt to the quickly changing channel state, thereby reducing the large delay caused by indicating the transmission mode through the high-level RRC signaling in the prior art. And the network equipment can indicate the CSI reporting modes of different modes of the terminal equipment according to the rapidly changing channel state, so that the network requirements of a future 5G system on lower time delay and higher speed are further met.

The method for data transmission according to the embodiment of the present invention is described in detail above with reference to fig. 1, and the method for reporting channel state information according to the embodiment of the present invention is described in detail below with reference to fig. 2.

Fig. 2 is a schematic flow chart diagram of a method 300 for reporting channel state information, shown from the perspective of device interaction. The method 300 is applied to a communication system including a network device and at least one terminal device, in which multiple transmission schemes and multiple aperiodic CSI reporting modes are predefined. Wherein each aperiodic CSI reporting mode can be applied to any of the multiple transmission schemes.

Hereinafter, the method for reporting csi according to the embodiment of the present invention is described in detail by taking an example of interaction between a base station and a first terminal device without loss of generality. It should be understood that the first terminal device may be any one of the at least one terminal device, and the "first" is used for distinguishing and explaining only, and should not constitute any limitation to the present invention.

As shown in fig. 2, the method 300 includes:

s310, the base station determines a target reporting mode of aperiodic CSI for the first terminal equipment;

s320, the base station sends a second DCI to the first terminal device, where the second DCI includes indication information of a target reporting mode of aperiodic CSI determined by the base station for the first terminal device;

s330, the first terminal equipment determines a target reporting mode of the aperiodic CSI according to the second DCI;

s340, the first terminal device reports the CSI based on the aperiodic CSI target reporting mode.

Optionally, S320 may specifically include:

the base station determines a target fourth information bit corresponding to the target reporting mode of the aperiodic CSI according to a fifth mapping relation, wherein the fifth mapping relation is used for indicating a one-to-one mapping relation between a plurality of fourth information bits and the plurality of aperiodic CSI reporting modes;

Correspondingly, S330 may specifically include:

the first terminal device determines a target reporting mode of aperiodic CSI according to a target fourth information bit in a fourth indication field in the received second DCI and the fifth mapping relationship, and reports CSI based on the target reporting mode of aperiodic CSI, where the fifth mapping relationship is used to indicate a one-to-one mapping relationship between a plurality of fourth information bits and the plurality of aperiodic CSI reporting modes.

Optionally, the method 300 further comprises:

and the base station sends third DCI to the first terminal equipment, wherein the third DCI comprises a target reporting mode of the periodic CSI determined by the base station for the first terminal equipment.

And the first terminal equipment determines a target reporting mode of the periodic CSI according to the third DCI.

And the first terminal equipment reports the CSI based on the target reporting mode of the periodic CSI.

Optionally, the method 300 further comprises:

the first terminal device determines a target reporting mode of periodic CSI determined by the base station for the first terminal device according to the target transmission scheme and the seventh mapping relationship, and reports CSI to the base station based on the target reporting mode of the periodic CSI, wherein the seventh mapping relationship is used for indicating a one-to-one mapping relationship between the multiple transmission schemes and the multiple periodic CSI reporting modes.

It should be understood that the method 300 for reporting csi according to the embodiment of the present invention is similar to the process of steps S150 to S210 in the method 100 for data transmission, and a detailed description of the specific process of the method 300 is omitted here for brevity.

Therefore, in the method for reporting CSI information according to the embodiment of the present invention, by removing the binding relationship between the transmission mode and the aperiodic CSI reporting mode, the network device can dynamically instruct the terminal device to report CSI based on any one of the predefined aperiodic CSI reporting modes according to the rapidly changing channel state, so as to adapt to the rapidly changing channel state, further implement dynamic switching of the transmission scheme, and meet network requirements of a future 5G system for lower latency and higher rate.

It should be understood that, in various embodiments of the present invention, the mapping relationships (including the first mapping relationship to the seventh mapping relationship) may be configured in advance in the network device and the terminal device, or may be sent to the terminal device by the network device when data is sent.

It should also be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. For example, steps S180 to S210 may be executed before steps S150 to S170, or may be executed simultaneously.

In the above, the method according to the embodiment of the present invention is explained in detail with reference to fig. 1 and 2. Hereinafter, an apparatus and a device according to an embodiment of the present invention will be described in detail with reference to fig. 3 to 6.

An embodiment of the present invention provides a terminal device, and a schematic block diagram of the terminal device may be as shown in fig. 3. Fig. 3 is a schematic block diagram of a terminal device 500 according to an embodiment of the present invention. As shown in fig. 3, the terminal device 500: a transceiving unit 510 and a processing unit 520.

In particular, the terminal device 500 may correspond to the terminal device in the method 100 or the method 300 for data transmission according to an embodiment of the present invention, and the terminal device 500 may include units for performing the method performed by the first terminal device of the method 100 in fig. 1 or the method 300 in fig. 2. Moreover, each unit and the other operations and/or functions in the terminal device 500 are respectively for implementing the corresponding flow of the method 100 in fig. 1 or the method 300 in fig. 2, and are not described again for brevity.

An embodiment of the present invention provides a network device, and a schematic block diagram of the network device is shown in fig. 4. Fig. 4 is a schematic block diagram of a network device 600 according to an embodiment of the present invention. As shown in fig. 4, the network device 600 includes: a processing unit 610 and a transceiving unit 620.

In particular, the network device 600 may correspond to the network device in the method 100 or the method 300 for data transmission according to an embodiment of the present invention, and the network device 600 may include units for performing the method performed by the terminal device in the method 100 or the method 300 in fig. 1 or fig. 2. Moreover, each unit and the other operations and/or functions in the network device 600 are respectively for implementing the corresponding flow of the method 100 in fig. 1 or the method 300 in fig. 2, and are not described herein again for brevity.

The embodiment of the invention also provides a terminal device, and a schematic block diagram of the terminal device is shown in fig. 5. Fig. 5 is a schematic block diagram of a terminal device 700 according to another embodiment of the present invention. As shown in fig. 5, the terminal device 700 includes: a transceiver 710, a processor 720, a memory 730, and a bus system 740. The transceiver 710, the processor 720 and the memory 730 are connected via a bus system 740, the memory 730 is used for storing instructions, and the processor 720 is used for executing the instructions stored in the memory 730 to control the transceiver 710 to transmit and receive signals. Memory 730 may be integrated within processor 720 or may be separate from processor 720.

In particular, the terminal device 700 may correspond to a terminal device in the method 100 or the method 300 for data transmission according to an embodiment of the present invention, and the terminal device 700 may include entity units for performing the method performed by the first terminal device of the method 100 or the method 300 in fig. 1 or fig. 2. Moreover, each entity unit and the other operations and/or functions in the terminal device 700 are respectively for implementing the corresponding flow of the method 100 in fig. 1 or the method 300 in fig. 2, and are not described herein again for brevity.

An embodiment of the present invention further provides a network device, and a schematic block diagram of the network device is shown in fig. 6. Fig. 6 is a schematic block diagram of a network device 800 according to another embodiment of the present invention. As shown in fig. 6, the network device 800 includes: a transceiver 810, a processor 820, a memory 830, and a bus system 840. The transceiver 810, the processor 820 and the memory 830 are connected by a bus system 840, the memory 830 is used for storing instructions, and the processor 820 is used for executing the instructions stored in the memory 830 to control the transceiver 810 to transmit and receive signals. The memory 830 may be integrated in the processor 820 or may be independent of the processor 820.

In particular, the network device 800 may correspond to the network device in the method 100 or the method 300 for data transmission according to an embodiment of the present invention, and the network device 800 may include entity units for performing the method performed by the network device in the method 100 or the method 300 in fig. 1 or fig. 2. Moreover, each entity unit and the other operations and/or functions in the network device 800 are respectively for implementing the corresponding processes of the method 100 in fig. 1 or the method 300 in fig. 2, and are not described herein again for brevity.

It should be understood that the processor in the embodiments of the present invention may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a Central Processing Unit (CPU), or other general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA), or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware component. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software in the decoding processor. The software may be in ram, flash, rom, prom, or eprom, registers, among other storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will also be appreciated that the memory in embodiments of the invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. Among them, the nonvolatile 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, and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, abbreviated as "SRAM"), Dynamic random access memory (Dynamic RAM, abbreviated as "DRAM"), Synchronous Dynamic random access memory (Synchronous DRAM, abbreviated as "SDRAM"), Double Data Rate Synchronous Dynamic random access memory (Double Data Rate SDRAM, abbreviated as "DDRSDRAM"), Enhanced Synchronous SDRAM (ESDRAM "), Synchronous Link DRAM (SLDRAM), and Direct bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It will also be appreciated that the bus system may include a power bus, a control bus, a status signal bus, etc., in addition to the data bus. For clarity of illustration, however, the various buses are labeled as a bus system in the figures.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of the method for data transmission disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or implemented by a combination of hardware and software in the processor. The software may be in ram, flash, rom, prom, or eprom, registers, among other storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.

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

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

In the 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 invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

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

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

Claims

1. A method for data transmission, applied to a communication system including a network device and at least one terminal device, wherein a plurality of transmission schemes for data transmission are predefined in the communication system, the method comprising:

a first terminal device of the at least one terminal device receives first Downlink Control Information (DCI) sent by the network device, where the first DCI includes indication information of a target transmission scheme determined by the network device for the first terminal device;

2. The method of claim 1, wherein the first DCI further includes control information for each of the plurality of transmission schemes,

the method further comprises the following steps:

and the first terminal equipment acquires target control information used for the target transmission scheme from the first DCI according to the target transmission scheme.

3. The method according to claim 1 or 2, wherein the indication information of the target transmission scheme is carried in a first indication field in the first DCI, and,

and the first terminal device determines the target transmission scheme according to a target first information bit in the first indication field in the received first DCI and a first mapping relation, where the first mapping relation is used to indicate a one-to-one mapping relation between a plurality of first information bits and the plurality of transmission schemes.

4. The method of claim 1, wherein a plurality of transmission modes for data transmission are predefined in the communication system, each transmission mode comprises at least one transmission scheme, the plurality of transmission modes correspond to a plurality of DCI formats in a one-to-one manner, indication information of a target transmission scheme determined by the network device for the first terminal device is carried in a second indication field in the first DCI, and,

and the first terminal device determines the target transmission scheme according to a target second information bit in the second indication field in the received first DCI and a third mapping relation, where the third mapping relation is used to indicate a one-to-one mapping relation between a plurality of second information bits and a plurality of transmission schemes included in the target transmission mode.

5. The method according to claim 1 or 2, characterized in that a plurality of transmission modes for data transmission are predefined in the communication system, each transmission mode comprising at least one transmission scheme, that indication information of the target transmission mode determined by the network device for the first terminal device is carried in a third indication field in the first DCI, that indication information of the target transmission scheme determined by the network device for the first terminal device is carried in a second indication field in the first DCI, and that,

the first terminal device determines a target transmission mode according to a third information bit in the second indication field in the received first DCI and a fourth mapping relation, where the fourth mapping relation is used to indicate a one-to-one mapping relation between a plurality of third information bits and the plurality of transmission modes;

and the first terminal device determines the target transmission scheme according to a target second information bit in the third indication field in the received first DCI and a third mapping relation, where the third mapping relation is used to indicate a one-to-one mapping relation between a plurality of second information bits and a plurality of transmission schemes included in the target transmission mode.

6. A method for reporting CSI (channel State information), is applied to a communication system comprising a network device and at least one terminal device, wherein a plurality of transmission schemes for data transmission and a plurality of aperiodic CSI reporting modes are predefined in the communication system, each aperiodic CSI reporting mode in the plurality of aperiodic CSI reporting modes can be applied to any one of the plurality of transmission schemes,

the method comprises the following steps:

7. The method of claim 6, wherein the determining, by the first terminal device, the target reporting mode of the aperiodic CSI according to the second DCI comprises:

8. The method according to claim 6 or 7, wherein a plurality of periodic CSI reporting modes are predefined in the communication system, the method further comprising:

the first terminal device receives third DCI sent by the network device, wherein the third DCI comprises indication information of a target reporting mode of periodic CSI determined by the network device for the first terminal device;

and the first terminal determines a target reporting mode of the periodic CSI according to a target fifth information bit in the fifth indication field in the received third DCI and a sixth mapping relationship, where the sixth mapping relationship is used to indicate a one-to-one mapping relationship between a plurality of fifth information bits and the plurality of periodic CSI reporting modes.

9. The method according to claim 6 or 7, wherein a plurality of periodic CSI reporting modes are defined in the communication system, and the plurality of transmission schemes correspond to the plurality of periodic CSI reporting modes one to one, and the method further comprises:

and the first terminal device determines a target reporting mode of the periodic CSI determined by the network device for the first terminal device according to the target transmission scheme and the seventh mapping relationship, where the seventh mapping relationship is used to indicate a one-to-one mapping relationship between the multiple transmission schemes and the multiple periodic CSI reporting modes.

10. A method for data transmission, applied to a communication system including a network device and at least one terminal device, wherein a plurality of transmission schemes for data transmission are predefined in the communication system, the method comprising:

the network equipment determines a target transmission scheme for a first terminal equipment in the at least one terminal equipment;

and the network equipment sends first Downlink Control Information (DCI) to the first terminal equipment, wherein the first DCI comprises the indication information of the target transmission scheme.

11. The method of claim 10, wherein the first DCI further comprises control information for each of the plurality of transmission schemes.

12. The method according to claim 10 or 11, wherein the network device sends a first downlink control information, DCI, to the first terminal device, the first DCI comprising the indication information of the target transmission scheme, including:

and the network equipment sends the first DCI, wherein a first indication field in the first DCI carries the target first information bit.

13. The method according to claim 10, wherein a plurality of transmission modes for data transmission are predefined in the communication system, each transmission mode comprising at least one transmission scheme, and,

before the network device determines a target transmission scheme for a first terminal device of the at least one terminal device, the method further comprises:

the network device determines a target transmission mode for the first terminal device, wherein the target transmission mode comprises the target transmission scheme;

the network equipment determines a target DCI format corresponding to the target transmission mode according to a second mapping relation, wherein the second mapping relation is used for indicating the one-to-one mapping relation between the plurality of DCI formats and the plurality of transmission modes;

the network device determines a target second information bit corresponding to the target transmission scheme according to a third mapping relation, where the third mapping relation is used to indicate a one-to-one mapping relation between at least one second information bit and at least one transmission scheme included in the target transmission mode;

14. The method according to claim 10 or 11, characterized in that a plurality of transmission modes for data transmission are predefined in the communication system, each transmission mode comprising at least one transmission scheme, and,

the network device determines a target third information bit corresponding to the target transmission mode according to a fourth mapping relation, wherein the fourth mapping relation is used for indicating a one-to-one mapping relation between the plurality of third information bits and the plurality of transmission modes;

and the network equipment sends the first DCI, wherein a third indication field in the first DCI carries the target third information bit, and a second indication field in the first DCI carries the target second information bit.

15. A method for reporting CSI (channel State information), is applied to a communication system comprising a network device and at least one terminal device, wherein a plurality of transmission schemes for data transmission and a plurality of aperiodic CSI reporting modes are predefined in the communication system, each aperiodic CSI reporting mode in the plurality of aperiodic CSI reporting modes can be applied to any one of the plurality of transmission schemes,

the method comprises the following steps:

and the network equipment sends second DCI to the first terminal equipment, wherein the second DCI comprises a target reporting mode of the aperiodic CSI.

16. The method of claim 15, wherein the network device sends a second DCI to the first terminal device, the second DCI including a target reporting mode for the aperiodic CSI comprises:

17. The method according to claim 15 or 16, wherein a plurality of periodic CSI reporting modes are predefined in the communication system, the method further comprising:

18. The method according to claim 15 or 16, wherein a plurality of periodic CSI reporting modes are predefined in the communication system, and wherein the plurality of periodic CSI reporting modes correspond to the plurality of transmission schemes one to one.

19. A terminal device, applied in a communication system including a network device and at least one terminal device, wherein a plurality of transmission schemes for data transmission are predefined in the communication system, the terminal device comprising: a transceiver, a processor, a memory and a bus system via which the receiver, the transmitter, the processor and the memory are connected,

wherein the memory is to store instructions and the processor is to execute the memory-stored instructions, and execution of the instructions stored in the memory causes the processor to perform the method of any of claims 1 to 9.

20. A network device, applied to a communication system including the network device and at least one terminal device, wherein a plurality of transmission schemes for data transmission are predefined in the communication system, the network device comprising: a transceiver, a processor, a memory and a bus system via which the receiver, the transmitter, the processor and the memory are connected,

wherein the memory is to store instructions and the processor is to execute the memory-stored instructions, and execution of the instructions stored in the memory causes the processor to perform the method of any of claims 10 to 18.