CN117676622A

CN117676622A - Transmission mode determining method and related device

Info

Publication number: CN117676622A
Application number: CN202210979291.8A
Authority: CN
Inventors: 余健; 许华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2024-03-08

Abstract

The application provides a transmission mode determining method and a related device. Wherein the method comprises the following steps: receiving first indication information from network equipment, wherein the first indication information is used for indicating precoding information; determining that the transmission mode is a first transmission mode; determining precoding according to the first indication information and the first transmission mode; data is transmitted to the network device over a physical uplink shared channel (physical uplink shared channel, PUSCH) according to the first transmission mode and the precoding. According to the technical scheme provided by the application, the dynamic switching of the transmission mode of the terminal equipment can be realized, so that the terminal equipment is adapted to different channel changes, interference changes, phase difference changes among the terminal equipment and the like, and the aggregation performance of the terminal equipment is improved.

Description

Transmission mode determining method and related device

Technical Field

The present disclosure relates to the field of wireless communications technologies, and in particular, to a method for determining a transmission mode and a related device.

Background

In uplink communication, a cell edge terminal device is generally limited by uplink transmission power, and has a low transmission rate, so that the requirement of high-rate service, such as backhaul high-definition video service, cannot be met. The power of two or more terminal devices can be aggregated together for data transmission through the multi-terminal device cooperative transmission or aggregation transmission technology, so that the power gain is obtained, and the uplink transmission rate is improved.

Multiple terminal devices may have multiple transmission modes during aggregate transmission, such as non-coherent joint transmission mode (non-coherent joint transmission, NCJT), coherent joint transmission mode (coherent joint transmission, cqt), diversity joint transmission (diversity joint transmission, DJT) mode, and so on. Different transmission modes correspond to different precoding design methods. Because factors such as channels, interference, phase differences among multiple terminal devices and the like are dynamically changed, various transmission modes need to be matched with the changes of the factors through dynamic switching, so that the system performance is improved. How to realize switching of multiple transmission modes is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a transmission mode determining method and a related device, which can realize dynamic switching of aggregation transmission modes of various terminal devices so as to adapt to different channel changes, interference changes, phase difference changes among the terminal devices and the like, and are beneficial to improving the aggregation performance of the terminal devices.

In a first aspect, the present application provides a transmission mode determining method, which may be applied to a terminal device, or may be applied to an apparatus (for example, a chip, or a chip system, or a circuit) in the terminal device, or may be an apparatus that can be used in cooperation with the terminal device, and will be described below by taking application to the terminal device as an example. The method may include: the terminal equipment receives first indication information from the network equipment, wherein the first indication information is used for indicating precoding information; determining that the transmission mode is a first transmission mode; determining precoding according to the first indication information and the first transmission mode; data is transmitted to the network device over a physical uplink shared channel (physical uplink shared channel, PUSCH) according to the first transmission mode and the precoding.

In the scheme provided by the application, the terminal equipment can dynamically determine the transmission mode, so that the method can adapt to dynamic changes of factors such as channels, interference, phase differences among multiple terminal equipment and the like, and data is sent to the network equipment through the PUSCH according to the determined transmission mode and the indication information from the network equipment for indicating the precoding information, thereby improving the aggregation performance of the terminal equipment and the system performance.

In one possible implementation, determining that the transmission mode is the first transmission mode includes: between the first time and the second time, if a first condition is satisfied, determining that the transmission mode is a first transmission mode, the first condition including at least one of: the variation of the transmitting power of the terminal equipment exceeds a preset threshold; switching uplink and downlink channels of the terminal equipment; the wave beam of the terminal equipment is switched; timing Advance (TA) of the terminal device is adjusted.

In the scheme provided by the application, one way of determining the transmission mode may be that the terminal device determines the transmission mode according to the first condition. Specifically, the network device may pre-configure the transmission mode of the terminal device to be the second transmission mode, and if the first condition is satisfied between the first time and the second time, the terminal device may determine that the transmission mode is switched from the second transmission mode to the first transmission mode, that is, the terminal device determines that the transmission mode is the first transmission mode, so that the mode switching delay of the terminal device may be reduced.

One possible implementation manner, the first time is a time when a channel sounding reference signal (sounding reference signal, SRS) is transmitted, the second time is a time when data is transmitted through PUSCH, and SRS is used to determine precoding.

In the scheme provided by the application, the first time may be a time when the terminal device transmits the SRS, and the second time may be a time when the terminal device transmits data through the PUSCH. Alternatively, the first time may be a time when the terminal device transmits SRS, and the second time may be a time when the terminal device transmits data through a physical uplink control channel (physical uplink control channel, PUCCH). The first time may refer to a first time domain resource, and may specifically be a slot (slot), a minislot (mini slot), a subframe (subframe), a frame (frame), or a transmission time unit (transmission time interval, TTI), etc. For example, the first moment is the 1 st symbol or the last 1 st symbol of the time domain resource occupied by the SRS. Similarly, the second time may refer to a second time domain resource, and may specifically be a time slot, a micro time slot, a subframe, a frame, or a transmission time unit. For example, the second time is the 1 st symbol or the last 1 symbol of the time domain resource occupied by the data transmitted through the PUSCH. The SRS is used to determine precoding, and it can be understood that the terminal device sends the SRS to the network device, and the network device can determine precoding according to the SRS measurement channel state information.

In one possible implementation, determining that the transmission mode is the first transmission mode includes: receiving second indication information from the network equipment, wherein the second indication information is used for indicating that the transmission mode of the terminal equipment is a first transmission mode; and determining the transmission mode as the first transmission mode according to the second indication information.

In the scheme provided by the application, the mode of determining the transmission mode may be that after the network device determines that the transmission mode of the terminal device is the first transmission mode, the network device may inform the terminal device through the indication information, so that the mode switching delay of the terminal device may be reduced.

In one possible implementation, before determining that the transmission mode is the first transmission mode, the communication method further includes: receiving third indication information from the network equipment, wherein the third indication information is used for indicating that the transmission mode is a second transmission mode; and determining the transmission mode as a second transmission mode according to the third indication information.

In the solution provided in the present application, one way to determine the transmission mode may be that the network device may pre-configure the transmission mode to the terminal device to be the second transmission mode through RRC. When the transmission mode of the terminal equipment needs to be switched, the terminal equipment can be informed of the fact that the transmission mode is the first transmission mode through RRC reconfiguration, namely, the switching of the transmission mode can be achieved through RRC reconfiguration, and the terminal equipment determines that the transmission mode is the first transmission mode according to the RRC reconfiguration.

In one possible implementation manner, after determining that the transmission mode is the second transmission mode, the communication method further includes: and sending request information to the network equipment, wherein the request information is used for requesting to re-determine the transmission mode.

In the scheme provided by the application, if the terminal device determines that the transmission mode is the second transmission mode according to the pre-configuration of the network device, the request information can be sent to the network device to request the network device to re-determine the transmission mode under the condition that the transmission mode needs to be switched.

One possible implementation manner, the first indication information is configured through downlink control information (downlink control information, DCI) or radio resource control (radio resource control, RRC) signaling, and the third indication information is configured through RRC signaling.

In one possible implementation, the communication method further includes: a plurality of radio network temporary identities (radio network temporary identity, RNTI) are received from a network device, different RNTIs corresponding to different transmission modes.

In the scheme provided by the application, the network equipment can configure a plurality of RNTIs to the terminal equipment through RRC signaling, and different RNTIs correspond to different transmission modes. For example, a first RNTI is used for CJT transmission, a second RNTI is used for NCJT transmission, and a third RNTI is used for DJT transmission, so that the terminal device can determine a corresponding transmission mode according to one RNTI of the plurality of RNTIs.

In one possible implementation, determining that the transmission mode is the first transmission mode includes: and determining that the transmission mode is the first transmission mode according to a first RNTI in the plurality of RNTI, wherein the first RNTI is used for scrambling DCI carrying the first indication information or cyclic redundancy check (cyclic redundancy check, CRC) bits contained in the DCI.

In the scheme provided by the application, a mode of determining the transmission mode may be that the network device configures a plurality of RNTIs to the terminal device, different RNTIs may correspond to different transmission modes, and the terminal device may determine the corresponding transmission mode according to a first RNTI in the plurality of RNTIs.

In one possible implementation manner, the first indication information further includes a transmission precoding indication (transmitted precoding matrix indicator, TPMI) field, where codebook sets corresponding to precoding matrices indicated by the TPMI field are different in different transmission modes; determining precoding according to the first indication information and the first transmission mode includes: and determining a codebook set corresponding to the precoding matrix of the first transmission mode according to the first transmission mode and the TPMI field.

In the scheme provided by the application, the first indication information may further include a TPMI field, and the codebook set corresponding to the precoding matrix indicated by the TPMI field in the first indication information may be associated with the transmission mode, that is, in different transmission modes, the codebook set corresponding to the precoding matrix indicated by the TPMI field is different. The terminal device may determine the indicated precoding matrix or the codebook set corresponding to the precoding matrix according to the TPMI field corresponding to the first transmission mode.

According to the method and the device, the transmission mode of the terminal equipment can be dynamically determined so as to adapt to dynamic changes of factors such as channels, interference, phase differences among multiple terminal equipment and the like, and the aggregation performance of the terminal equipment is improved, so that the system performance is improved.

In a second aspect, the present application provides a transmission mode determining method, which may be applied to a network device, or may be applied to an apparatus (for example, a chip, or a chip system, or a circuit) in the network device, or may be an apparatus that can be used in cooperation with the network device, and will be described below by taking application to the network device as an example. The method may include: the network equipment determines that the transmission mode of the terminal equipment is a first transmission mode; sending first indication information to terminal equipment, wherein the first indication information is used for indicating precoding information; and receiving data from the terminal equipment through the PUSCH according to the first transmission mode, wherein the precoding is determined by the first indication information and the first transmission mode.

In the scheme provided by the application, the network equipment can dynamically determine the transmission mode, so that the network equipment can adapt to dynamic changes of factors such as channels, interference, phase differences among multiple terminal equipment and the like, and inform the terminal equipment of the determined transmission mode, so that the terminal equipment can send data to the network equipment through the PUSCH according to the determined transmission mode and the indication information which is used for indicating the precoding information and comes from the network equipment, and therefore the aggregation performance of the terminal equipment can be improved, and the system performance is improved.

It should be understood that the implementation body of the second aspect may be a network device, where specific content of the second aspect corresponds to content of the first aspect, and corresponding features and achieved beneficial effects of the second aspect may refer to descriptions of the first aspect, and detailed descriptions are omitted herein as appropriate to avoid repetition.

In one possible implementation manner, determining that the transmission mode of the terminal device is the first transmission mode includes: between the first time and the second time, if a first condition is satisfied, determining that the transmission mode of the terminal device is the first transmission mode, the first condition including at least one of: the variation of the transmitting power of the terminal equipment exceeds a preset threshold; switching uplink and downlink channels of the terminal equipment; the wave beam of the terminal equipment is switched; the TA of the terminal device is adjusted.

One possible implementation manner is that the first time is a time when the terminal device generates SRS, and the second time is a time when the terminal device sends data through PUSCH, where the SRS is used to determine precoding.

In one possible implementation, the communication method further includes: and sending second indication information to the terminal equipment, wherein the second indication information is used for indicating that the transmission mode of the terminal equipment is the first transmission mode.

In one possible implementation, the communication method further includes: determining that the transmission mode of the terminal equipment is a second transmission mode; and sending third indication information to the terminal equipment, wherein the third indication information is used for indicating that the transmission mode of the terminal equipment is the second transmission mode.

In one possible implementation, the communication method further includes: receiving request information from a terminal device, wherein the request information is used for requesting to re-determine a transmission mode; and sending the first indication information to the terminal equipment.

One possible implementation manner, the first indication information is configured through DCI or RRC signaling, and the third indication information is configured through RRC signaling.

One possible implementation way is to send first indication information to different terminal devices through the same DCI; or sending the first indication information to different terminal equipment through different DCIs.

In one possible implementation, the communication method further includes: and sending a common RNTI to different terminal equipment, wherein the common RNTI is used for scrambling DCI carrying the first indication information or CRC bits contained in the DCI.

One possible implementation manner, in the case that the first indication information is sent to different terminal devices through the same DCI, indicates precoding information of different terminal devices through different part bits of a TPMI field in the DCI; or, in the case of transmitting the first indication information to different terminal devices through different DCIs, the precoding information of the different terminal devices is independently indicated through TPMI fields in the different DCIs.

In one possible implementation, the communication method further includes: and sending a plurality of RNTIs to the terminal equipment, wherein different RNTIs correspond to different transmission modes.

In one possible implementation manner, the first indication information further includes a TPMI field, and in different transmission modes, codebook sets corresponding to precoding matrices indicated by the TPMI field are different.

In a third aspect, embodiments of the present application provide a communication device.

The advantages may be seen from the description of the first aspect, which is not repeated here. The communication device has the functionality to implement the actions in the method example of the first aspect described above. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

A possible implementation manner, the communication device includes:

a receiving unit, configured to receive first indication information from a network device, where the first indication information is used to indicate precoding information;

a determining unit configured to determine that the transmission mode is a first transmission mode;

a determining unit, configured to determine precoding according to the first indication information and the first transmission mode;

and the sending unit is used for sending data to the network equipment through the PUSCH according to the first transmission mode and the precoding.

In one possible implementation, the determining unit is specifically configured to:

between the first time and the second time, if a first condition is satisfied, determining that the transmission mode is a first transmission mode, the first condition including at least one of: the variation of the transmitting power of the terminal equipment exceeds a preset threshold; switching uplink and downlink channels of the terminal equipment; the wave beam of the terminal equipment is switched; the TA of the terminal device is adjusted.

In one possible implementation, the first time is a time when the SRS is transmitted, and the second time is a time when data is transmitted through the PUSCH, where the SRS is used to determine precoding.

receiving second indication information from the network equipment, wherein the second indication information is used for indicating that the transmission mode of the terminal equipment is a first transmission mode;

and determining the transmission mode as the first transmission mode according to the second indication information.

A possible implementation manner, before determining that the transmission mode is the first transmission mode, the determining unit is further configured to receive third indication information from the network device, where the third indication information is used to indicate that the transmission mode is the second transmission mode; and determining the transmission mode as a second transmission mode according to the third indication information.

In one possible implementation manner, after the determining unit determines that the transmission mode is the second transmission mode, the sending unit is further configured to send request information to the network device, where the request information is used to request to redetermine the transmission mode.

A possible implementation manner, the receiving unit is further configured to receive multiple RNTIs from the network device, where different RNTIs correspond to different transmission modes.

In one possible implementation, the determining unit is specifically configured to: and determining that the transmission mode is the first transmission mode according to a first RNTI in the plurality of RNTIs, wherein the first RNTI is used for scrambling DCI carrying the first indication information or CRC bits contained in the DCI.

In one possible implementation manner, the first indication information further includes a TPMI field, and in different transmission modes, codebook sets corresponding to precoding matrices indicated by the TPMI field are different; the determining unit is specifically configured to: and determining a codebook set corresponding to the precoding matrix of the first transmission mode according to the first transmission mode and the TPMI field.

In a fourth aspect, embodiments of the present application provide a communication device.

The advantages may be seen from the description of the second aspect, which is not repeated here. The communication device has the functionality to implement the behavior in the method example of the second aspect described above. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

A possible implementation manner, the communication device includes:

a determining unit, configured to determine a transmission mode of the terminal device as a first transmission mode;

a transmitting unit, configured to transmit first indication information to a terminal device, where the first indication information is used to indicate precoding information;

and a receiving unit, configured to receive data from the terminal device through the PUSCH according to a first transmission mode, where the precoding is determined by the first indication information and the first transmission mode.

A possible implementation manner, the determining unit is specifically configured to: between the first time and the second time, if a first condition is satisfied, determining that the transmission mode of the terminal device is the first transmission mode, the first condition including at least one of: the variation of the transmitting power of the terminal equipment exceeds a preset threshold; switching uplink and downlink channels of the terminal equipment; the wave beam of the terminal equipment is switched; the TA of the terminal device is adjusted.

A possible implementation manner, the sending unit is further configured to send second indication information to the terminal device, where the second indication information is used to indicate that a transmission mode of the terminal device is the first transmission mode.

A possible implementation manner, the determining unit is further configured to determine that a transmission mode of the terminal device is a second transmission mode;

the sending unit is further configured to send third indication information to the terminal device, where the third indication information is used to indicate that the transmission mode of the terminal device is the second transmission mode.

A possible implementation manner, the receiving unit is further configured to receive request information from the terminal device, where the request information is used to request to re-determine the transmission mode;

and the sending unit is also used for sending the first indication information to the terminal equipment.

In one possible implementation manner, when the sending unit sends the first indication information to different terminal devices through the same DCI, the sending unit is further configured to send a common RNTI to different terminal devices, where the common RNTI is used to scramble DCI carrying the first indication information or CRC bits contained in the DCI.

One possible implementation manner, in the case that the sending unit sends the first indication information to different terminal devices through the same DCI, indicates precoding information of different terminal devices through different part bits of a TPMI field in the DCI; or, in the case that the transmitting unit transmits the first indication information to the different terminal devices through different DCIs, precoding information of the different terminal devices is independently indicated through TPMI fields in the different DCIs.

In a possible implementation manner, the sending unit is further configured to: and sending a plurality of RNTIs to the terminal equipment, wherein different RNTIs correspond to different transmission modes.

In a fifth aspect, a communication device is provided, which may be a terminal device, or may be a device (e.g., a chip, or a system-on-chip, or a circuit) in a terminal device. The apparatus may comprise a processor for receiving information from a communication apparatus other than the communication apparatus, a memory, an input interface for outputting information to the communication apparatus other than the communication apparatus, and an output interface for invoking a computer program stored in the memory to perform the transmission mode determination method provided by the first aspect or any implementation of the first aspect.

In a sixth aspect, a communication apparatus is provided, which may be a network device, or may be an apparatus (e.g., a chip, or a system-on-chip, or a circuit) in a network device. The apparatus may comprise a processor, a memory, an input interface for receiving information from a communication apparatus other than the communication apparatus, and an output interface for outputting information to a communication apparatus other than the communication apparatus, the processor invoking a computer program stored in the memory to perform the transmission mode determination method provided in the second aspect or any embodiment of the second aspect.

In a seventh aspect, the present application provides a communication system comprising at least one terminal device and at least one network device for performing any of the transmission mode determination methods of the first to second aspects described above, when at least one of the aforementioned terminal devices and at least one of the aforementioned network devices are operating in the communication system.

In an eighth aspect, the present application provides a computer readable storage medium having stored thereon computer instructions which, when executed, cause the method described in the first aspect and any one of the possible implementations thereof and the second aspect and any one of the possible implementations thereof to be performed.

In a ninth aspect, the present application provides a computer program product comprising executable instructions which, when run on a user equipment, cause the method described in the first aspect and any one of its possible implementations and the second aspect and any one of its possible implementations to be performed.

In a tenth aspect, the present application provides a chip system comprising a processor and possibly a memory for implementing the method of the first aspect and any one of the possible implementations thereof and the second aspect and any one of the possible implementations thereof. The chip system may be formed of a chip or may include a chip and other discrete devices.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below.

Fig. 1 is a schematic diagram of an NCJT transmission provided in an embodiment of the present application;

fig. 2 is a schematic diagram of a network architecture according to an embodiment of the present application;

fig. 3 is a schematic diagram of cqt transmission provided in an embodiment of the present application;

fig. 4 is a schematic diagram of a DJT transmission provided in an embodiment of the present application;

FIG. 5 is an interactive schematic diagram of a communication method according to an embodiment of the present application;

Fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of still another communication device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

In the description of the present application, "/" means "or" unless otherwise indicated, for example, a/B may mean a or B. The term "and/or" in this application is merely an association relation describing an association object, and means that three kinds of relations may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. Furthermore, "at least one" may refer to one or more, and "a plurality" may refer to two or more. The "first", "second", etc. do not limit the number and order of execution, and the "first", "second", etc. do not necessarily differ.

In this application, the terms "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the description of the present application, "indication" may include direct indication and indirect indication, and may include display indication and implicit indication. Information indicated by a certain information (indication information described below) is called information to be indicated, and in a specific implementation process, there are various ways to indicate the information to be indicated. For example, the information to be indicated may be directly indicated, such as indicating the information to be indicated itself or an index of the information to be indicated. For another example, the information to be indicated may be indirectly indicated by indicating other information, where there is an association relationship between the indicated other information and the information to be indicated. For another example, only a portion of the information to be indicated may be indicated, while other portions of the information to be indicated are known or agreed in advance. In addition, the indication of the specific information can be realized by means of the arrangement sequence of the various information which is pre-agreed (as specified by the protocol), so that the indication overhead is reduced to a certain extent.

In a wireless communication system, communications can be classified into different types according to the kinds of transmitting nodes and receiving nodes. The network device is generally referred to as a Downlink (DL) communication when transmitting information to a terminal device or a User Equipment (UE), and an Uplink (UL) communication when transmitting information to a network device. In fourth generation (fourth generation, 4G) and fifth generation (5G) wireless communication systems, new radio access technology (new radio access technology, NR) systems, uplink may perform channel state information (channel state information, CSI) measurements via sounding reference signals (sounding reference signal, SRS), and downlink may perform CSI measurements via channel state information reference signals (CSI-RS). In the current uplink transmission of 5G NR, a physical uplink shared channel (physical uplink shared channel, PUSCH) may employ a codebook-based transmission mode and a non-codebook-based transmission mode. For codebook transmission, the network device indicates to the terminal device to transmit a PMI (TPMI) corresponding to 1 precoding matrix in the codebook set. While for non-codebook transmission, the network device indicates to the terminal the sounding reference signal resource index (SRS resource indicator, SRI) associated to 1 non-quantized precoding matrix.

In uplink communication, a cell edge terminal device is generally limited by uplink transmit power, and a transmission rate is generally low, so that a high-rate service requirement, such as a high-definition video backhaul service, cannot be met. The power of two or more terminal devices can be aggregated together for data transmission through the multi-terminal device cooperative transmission or aggregation transmission technology, so that the power gain is obtained, and the uplink transmission rate is improved. When the multi-terminal device performs aggregation transmission, multiple transmission modes may exist, and different transmission modes correspond to different precoding design methods. For example, the transmission modes may include a non-coherent joint transmission mode (non-coherent joint transmission, NCJT), a coherent joint transmission mode (coherent joint transmission, CJT), a diversity joint transmission (diversity joint transmission, DJT) mode, and so on. Because factors such as channels, interference, phase differences among multiple terminal devices and the like are dynamically changed, various transmission modes need to be matched with the changes of the factors through dynamic switching, so that the system performance is improved. How to switch between multiple transmission modes and corresponding precoding indications is a problem to be solved.

First, in order to facilitate understanding of the embodiments of the present application, technical problems to be specifically solved by the present application are further analyzed and presented. Currently, the implementation of a transmission mode for aggregation transmission by a multi-terminal device includes various technical solutions, and the following exemplary examples are listed below, where:

scheme one: NCJT technical scheme

In the prior art scheme (such as the scheme adopted by 3gpp Release 18), the aggregation terminal device adopts the transmission mode of NCJT for transmission, that is, the aggregation terminal device determines precoding according to the respective channel states, and the aggregation terminal device transmits different data. Referring to fig. 1, fig. 1 is a schematic diagram of an NCJT transmission according to an embodiment of the present application. As shown in fig. 1, channels from the first terminal device and the second terminal device to the network device are H1 and H2, respectively, and precoding matrices are W1 and W2, respectively. For NCJT transmissions by the first and second terminal devices, the network device may determine W1 from channel H1 and W2 from channel H2, respectively. For the cqt transmission performed by the first terminal device and the second terminal device, the network device may jointly determine the precoding according to H1 and H2, so as to ensure that the effect of coherent superposition is achieved when the transmission signals of the first terminal device and the second terminal device reach the network device.

When the first terminal device and the second terminal device perform NCJT transmission, because the precoding is independently determined and the data before the precoding of the transmission is different, the phase alignment between the first terminal device and the second terminal device does not need to be ensured. In the prior art scheme, since only the NCJT transmission mode is considered, no network device is required to separately configure signaling to indicate the transmission mode. In addition, the indication method of precoding still adopts the indication method of precoding during single terminal equipment transmission. The precoding indication method of the single terminal equipment is described below.

The current protocol defines a codebook set for different numbers of antenna ports and number of transmission layers. The network device indicates precoding matrix indexes through TPMI fields carried in downlink control indication (downlink control indicator, DCI), and each 1 precoding matrix index corresponds to 1 precoding matrix in the codebook set. A detailed description of the codebook set and precoding indication is as follows.

1. Codebook set

In the NR standard (see e.g. 3gpp TS 38.212 section 6.3.1.5), the set of codebooks can be defined as follows (for example, a codebook of two transmit antennas for a terminal device). In tables 1 and 2, codebook indexes when the terminal device transmits one stream and two streams, respectively, are given. The codebook set for 4 antennas can be seen in 3gpp TS 38.212 section 6.3.1.5. TPMI indicates the index of the corresponding codebook (the index is ordered from left to right to ascending).

Table 1 precoding matrix w for single layer transmission using two antenna ports

Table 2 precoding matrix w for dual layer transmission using two antenna ports with disabled transition precoding

After precoding is determined, the mapping process of the PUSCH transmission data to each antenna port through the precoding matrix is as follows:

wherein W represents the precoding matrix or vector in tables 1 and 2, y ^(v-1) (i) Representing the data prior to precoding, v represents the layer index,representing precoded data, i.e. corresponding antenna port p _ρ-1 Data on the same. For single layer transmission of two antennas, i.e.>If single antenna transmission is performed, W defaults to 1, which is equivalent to not precoding.

2. The network device indicates to the terminal device the precoding matrix in the codebook set

After the network device determines the TPMI according to the uplink channel measurement, the TPMI needs to be indicated before the terminal device sends the PUSCH, otherwise, the terminal device cannot determine which codebook index should be selected. In the prior art scheme, the network device indicates TPMI in DCI, and the detailed indication is shown in table 3 (see, for details, 3gpp TS 38.212 section 7.3.1.1). The network device indicates TPMI through DCI, and its bit length is related to a transmission mode, a number of layers (Rank) to be transmitted, and the number of antenna ports.

TABLE 3TPMI indication

The disadvantage of this scheme one:

only the NCJT transmission mode and the precoding indication method in the mode are supported. Since each terminal device independently determines precoding in the NCJT transmission mode, inter-layer interference may be introduced. When multiple transmission modes coexist, the prior art does not support dynamic switching of multiple transmission modes, so as to adapt to changes of factors such as channels, interference, phase among terminal devices and the like, and is not beneficial to improving the aggregation performance of the terminal devices.

Therefore, the technical problems to be solved by the embodiments of the present application may include: for the situation that a plurality of transmission modes exist in the aggregation transmission of the terminal equipment, 1, the dynamic switching of the plurality of transmission modes is realized through a plurality of signaling indication methods; 2. and giving out a precoding indication method after mode switching. The embodiment of the application can realize the dynamic switching of the aggregation transmission modes of various terminal equipment so as to adapt to different channel changes, interference changes, phase changes among the terminal equipment and the like, and can improve the aggregation performance of the terminal equipment.

Based on the foregoing, in order to better understand a precoding indication method and a related device for user aggregation multi-mode transmission provided in the present application, a network architecture applied in an embodiment of the present application is described below.

Referring to fig. 2, fig. 2 is a schematic diagram of a network architecture according to an embodiment of the present application.

The technical solution of the embodiment of the application can be applied to various communication systems, for example: global system for mobile communications (global system for mobile communication, GSM) system, code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, general mobile communications (universal mobile telecommunications system, UMTS) system, enhanced data rates for GSM evolution (enhanced data rate for GSM evolution, EDGE) system, worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) system. The technical solutions of the embodiments of the present application may also be applied to other communication systems, such as a public land mobile network (public land mobile network, PLMN) system, an advanced long term evolution (LTE-a) system, a fifth generation mobile communication (the 5th generation,5G) system, a new air interface (NR) system, a machine-to-machine communication (machine to machine, M2M) system, or other communication systems that evolve in the future, which are not limited in this application. The technical solution provided in the embodiments of the present application may also be applied to other communication systems, as long as a presentity in the communication system can send control information and send (and/or receive) transport blocks, and other entities in the communication system can receive control information and receive (and/or send) transport blocks.

As shown in fig. 2, the network device and the terminal devices 1 to 6 constitute a communication system in which the network device transmits downlink data to one or more of the terminal devices 1 to 6, and the terminal devices 1 to 6 may also transmit uplink data to the network device. In addition, aggregate transmissions may be made between the terminal devices, such as terminal device 4-terminal device 6 shown in the figures.

A terminal device in the embodiments of the present application is an entity on the user side for receiving or transmitting signals, such as a user device, 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. The terminal device may also be a cellular telephone, a cordless telephone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network or a terminal device in a future evolved public land mobile network (public land mobile network, PLMN), etc., as the embodiments of the application are not limited in this regard.

By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

In addition, in the embodiment of the application, the terminal device may also be a terminal in an internet of things (internet of things, ioT) system, and the IoT is an important component of future information technology development, and the main technical characteristic of the terminal device is that the article is connected with a network through a communication technology, so that man-machine interconnection and an intelligent network for interconnecting the articles are realized. In the embodiment of the application, the IOT technology can achieve mass connection, deep coverage and terminal power saving through a Narrowband (NB) technology, for example.

In addition, in the embodiment of the application, the terminal device may further include sensors such as an intelligent printer, a train detector, and a gas station, and the main functions include collecting data (part of the terminal device), receiving control information and downlink data of the network device, and transmitting electromagnetic waves to the network device to transmit uplink data.

The network device in this embodiment of the present application is an entity for transmitting or receiving signals, may be a device for communicating with a terminal device, and may be a base station (base transceiver station, BTS) in a global system for mobile communications (global system for mobile communications, GSM) or code division multiple access (code division multiple access, CDMA), a base station (NodeB, NB) in a wideband code division multiple access (wideband code division multiple access, WCDMA) system, an evolved NodeB (eNB or eNodeB) in an LTE system, or a wireless controller in a cloud wireless access network (cloud radio access network, CRAN) scenario, or the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a 5G network, or a network device in a PLMN network for future evolution, etc., which embodiments of the present application are not limited.

The network device in the embodiments of the present application may be a device in a wireless network, such as a radio access network (radio access network, RAN) node that accesses the terminal device to the wireless network. Currently, some examples of RAN nodes are: a base station, a next generation base station gNB, a transmission and reception point (transmission reception point, TRP), an evolved Node B (eNB), a home base station, a baseband unit (BBU), or an Access Point (AP) in a WiFi system, etc. In one network architecture, the network devices may include Centralized Unit (CU) nodes, or Distributed Unit (DU) nodes, or RAN devices including CU nodes and DU nodes.

In the embodiment of the application, the terminal device or the network device includes a hardware layer, an operating system layer running above the hardware layer, and an application layer running above the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like. Further, the embodiment of the present application is not particularly limited to the specific structure of the execution body of the method provided in the embodiment of the present application, as long as the communication can be performed by the method provided in the embodiment of the present application by running the program recorded with the code of the method provided in the embodiment of the present application, and for example, the execution body of the method provided in the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call the program and execute the program.

Furthermore, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein encompasses a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disk, floppy disk, or magnetic tape, etc.), optical disks (e.g., compact Disk (CD), digital versatile disk (digital versatile disc, DVD), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), cards, sticks, key drives, etc.). Additionally, 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 noted that the number and types of terminal devices included in the network architecture shown in fig. 2 are merely examples, and embodiments of the present application are not limited thereto. For example, more or fewer terminal devices in communication with the network device may also be included, and are not depicted in the figures for simplicity of description. In addition, in the network architecture shown in fig. 2, although the network device and the terminal device are shown, the application scenario may not be limited to include the network device and the terminal device, for example, may also include a core network node or a device for carrying a virtualized network function, which will be obvious to those skilled in the art, and will not be described in detail herein.

Definitions of technical terms that may appear in embodiments of the present application are given below, and terms used in the implementation section of the present application are only used to explain specific embodiments of the present application and are not intended to limit the present application.

(1) Uplink transmission

For precoding indication of uplink transmission (e.g., PUSCH transmission based on Codebook (CB), non-codebook (NCB)), the radio access network device may be indicated by a TPMI field or SRS resource index (SRS resource index, SRI) field in the DCI.

(2) Incoherent joint transmission mode (non-coherent joint transmission, NCJT)

As shown in fig. 1, the precoding W1 of the first terminal equipment is determined according to the channel H1, and the precoding W2 of the second terminal equipment is determined according to the channel H2. No phase calibration is required between the two terminal devices. The first terminal device and the second terminal device may transmit different Transport Blocks (TBs) or different redundancy versions of the same TB. The transmission signals of the first terminal device and the second terminal device may interfere.

(3) Coherent joint transmission mode (coherent joint transmission, CJT)

Referring to fig. 3, fig. 3 is a schematic diagram of CJT transmission according to an embodiment of the present application. As shown in fig. 3, the precoding of the first terminal device and the second terminal device is determined according to the joint channel h= [ H1, H2 ]. Phase calibration is required between two terminal devices to ensure that signals transmitted by the two terminal devices are coherently superimposed when reaching the network device. Two terminal devices transmit the same redundancy version of the same TB without interference between the terminal devices.

(4) Diversity joint transmission (diversity joint transmission, DJT)

Referring to fig. 4, fig. 4 is a schematic diagram of a DJT transmission according to an embodiment of the present application. As shown in fig. 4, cyclic precoding is used between two terminal equipments. One possible implementation is to use cyclic delay diversity (cycling delay diversity), i.e. a phase offset between the signals transmitted between the first and second terminal devices, to obtain diversity gain. Two terminal devices transmit the same redundancy version of the same TB, no interference exists between the terminal devices, and the phase calibration requirement is not high.

(5) And (3) coherent superposition: two or more vector signals are superimposed in the same direction. A strong coherence indicates a strong signal power after superposition of two or more vectors and a weak coherence indicates a weak signal power after superposition of two or more vectors.

(6) Coherent transmission: the plurality of signals are coherently superimposed.

(7) Power consistency: the transmit power at different times remains the same.

(8) Phase continuity: the phase at different times remains the same or the amount of phase change is less than a predefined threshold.

In combination with the above network architecture, a communication method provided in the embodiments of the present application is described below. Referring to fig. 5, fig. 5 is an interaction schematic diagram of a communication method according to an embodiment of the present application. The communication method may be used to determine a transmission mode of the terminal device. The functions performed by the terminal device in this embodiment may also be performed by means (e.g., a chip, or a system-on-chip, or a circuit) in the terminal device. The functions performed by the network device in this embodiment may also be performed by an apparatus (e.g., a chip, or a system-on-chip, or a circuit) in the network device. As shown in fig. 5, the communication method may include S501-S504.

S501: the network device determines that the transmission mode of the terminal device is the first transmission mode.

The transmission mode may be understood as an aggregate transmission mode of the terminal device, for example, the transmission mode may be NCJT, CJT, DJT or the like. The first transmission mode may be any of NCJT, CJT, DJT transmission modes. In this embodiment of the present application, the aggregate transmission of the terminal device may be aggregate transmission performed by two terminal devices or more, and hereinafter, the aggregate transmission performed by two terminal devices will be illustrated as an example, and for convenience of description, the terminal devices of the two aggregate transmissions may be referred to as a first terminal device and a second terminal device, respectively. The first terminal device may assist the second terminal device in data transmission, or the second terminal device may assist the first terminal device in data transmission.

Prior to step S501, the network device may pre-configure the transmission mode of the terminal device to one or more terminal devices with which it communicates. For example, the network device may send third indication information to the terminal device, where the third indication information is used to indicate that the transmission mode is the second transmission mode. The second transmission mode may be any one of the transmission modes NCJT, CJT, DJT, wherein the first transmission mode and the second transmission mode are different transmission modes. Optionally, the third indication information may further include antenna port number information, an antenna port index, or other configuration information such as a mapping relationship between the antenna port index and the precoding matrix indicated by the TPMI field in the DCI. Wherein, the third indication information can be carried through RRC signaling.

For example, in one embodiment, the network device may send third indication information to the first terminal device and the second terminal device through RRC signaling, where the third indication information may be transmission mode configuration information indicating the terminal device, and the third indication information may include transmission mode indication information, antenna port number information, antenna port index, or a mapping relationship between the antenna port index and a precoding matrix indicated by a TPMI field in DCI, and so on. For example, the transmission mode indication information of the terminal device indicates that the transmission mode of the terminal device is a second transmission mode, for example, the second transmission mode may be cqt, and the number of antenna ports is n1+n2, where N1 is the number of antenna ports of the first terminal device, and N2 is the number of antenna ports of the second terminal device. According to the antenna port number configuration, it may be determined that the precoding matrix indicated by the TPMI field in the DCI is from a codebook set with antenna ports of n1+n2. For example, when N1 is 2 and N2 is 2, TPMI indicates a precoding matrix of 1 4 antenna ports. Although the first terminal device and the second terminal device have only two antenna ports, the first terminal device and the second terminal device can be equivalently regarded as 4 antenna ports after cqt transmission is adopted.

For example, the second transmission mode may be NCJT, and the antenna port indexes of the first terminal device and the second terminal device may be independently numbered, e.g., the antenna port indexes of the first terminal device and the second terminal device are 0 and 1, respectively; or the antenna port index of the first terminal device is 0 and 1, and the antenna port index of the second terminal device is 2 and 3.

For another example, the second transmission mode may be cqt, the antenna port indexes of the first terminal device and the second terminal device may aggregate numbers, for example, the antenna port indexes of the first terminal device and the second terminal device are 0, 1, 2, and 3, wherein the antenna port indexes of the first terminal device and the second terminal device are any two of 0, 1, 2, and 3, the antenna port indexes of the first terminal device and the second terminal device are different, for example, the antenna port indexes of the first terminal device may be 0, 1, and the antenna port indexes of the second terminal device may be 2 and 3; or the antenna port index of the first terminal device may be 0 or 2, and the antenna port index of the second terminal device may be 1 or 3; or the antenna port index of the first terminal device may be 0 or 3, and the antenna port index of the second terminal device may be 1 or 2; etc.

Further, the precoding matrix corresponding to the antenna port index may be determined by a mapping relationship between the antenna port index and the precoding matrix indicated by the TPMI field in the DCI. For example, when the antenna port index of the first terminal device is 0 and 1 and the antenna port index of the second terminal device is 0 and 1, the antenna port index of the first terminal device 0 and 1 corresponds to the 1 st row and the 3 rd row of the precoding matrix indicated by the TPMI field in the DCI, and the antenna port index of the second terminal device 0 and 1 corresponds to the 2 nd row and the 4 th row of the precoding matrix. For another example, when the antenna port index of the first terminal device is 0 and 1 and the antenna port index of the second terminal device is 2 and 3, the antenna port indexes 0 and 1 of the first terminal device correspond to the 1 st row and the 3 rd row of the precoding matrix indicated by the TPMI field in the DCI, and the antenna port indexes 2 and 3 of the second terminal device correspond to the 2 nd row and the 4 th row of the precoding matrix. For another example, when the antenna port index of the first terminal device is 0 and 2 and the antenna port index of the second terminal device is 1 and 3, the antenna port indexes 0 and 2 of the first terminal device correspond to the 1 st row and the 3 rd row of the precoding matrix indicated by the TPMI field in the DCI, and the antenna port indexes 1 and 3 of the second terminal device correspond to the 2 nd row and the 4 th row of the precoding matrix.

It will be appreciated that the foregoing description is only given by way of example only of the first terminal device and the second terminal device, and the number of antenna ports of the terminal device is not limited in this embodiment, and the foregoing examples do not limit the scope of this embodiment.

One possible implementation manner is, for example, a second transmission mode is CJT, where the CJT may ensure coherent signal superposition between the first terminal device and the second terminal device, and the transmission performance is better. But cqt needs to ensure that the first terminal device and the second terminal device maintain power consistency and/or phase continuity between the channel measurement time and the PUSCH transmission time. When at least one of the following events occurs in the terminal device, a phase difference is changed, so that cqt transmission cannot be performed. It is to be understood that there are no exclusions of phase difference variations caused by other events, the following events being merely exemplary. For descriptive convenience, an event that may satisfy the first condition is defined as an incoherent event. The first condition may include at least one of: between the first moment in time and the second moment in time,

the variation of the transmitting power of the terminal equipment exceeds a preset threshold value which is larger than 0; the change amount of the transmission power of the terminal device exceeds a preset threshold, which is understood to be that the transmission power of the terminal device changes, or the change amount of the transmission power of the terminal device exceeds a preset threshold, for example, the preset threshold is 5dBm.

Switching uplink and downlink channels of the terminal equipment;

the wave beam transmission of the terminal equipment is switched;

TA generation adjustment of the terminal device, etc.

The first time may be a time when the terminal device transmits the SRS, and the second time may be a time when the terminal device transmits data through the PUSCH. Alternatively, the first time may be a time when the terminal device transmits SRS, and the second time may be a time when the terminal device transmits data through a physical uplink control channel (physical uplink control channel, PUCCH). The first time may refer to a first time domain resource, and may specifically be a slot (slot), a minislot (mini slot), a subframe (subframe), a frame (frame), or a transmission time unit (transmission time interval, TTI), etc. For example, the first moment is the 1 st symbol or the last 1 st symbol of the time domain resource occupied by the SRS. Similarly, the second time may refer to a second time domain resource, and may specifically be a time slot, a micro time slot, a subframe, a frame, or a transmission time unit. For example, the second time is the 1 st symbol or the last 1 symbol of the time domain resource occupied by the data transmitted through the PUSCH. The SRS is used to determine precoding, and it can be understood that the terminal device sends the SRS to the network device, and the network device can determine precoding according to the SRS measurement channel state information.

If the terminal device generates an incoherent event, the first terminal device and the second terminal device cannot perform cqt transmission, and the network device may not schedule the first terminal device and the second terminal device, or may switch to other transmission modes to continue to schedule the first terminal device and the second terminal device. If the network device does not schedule the first terminal device and the second terminal device, resource waste is caused or waiting time delay of the first terminal device and the second terminal device is increased. For example, the network device schedules at time t, and makes the first terminal device and the second terminal device send data through PUSCH at time t+n, and if an incoherent event is sent between time t and time t+n, the terminal device needs to be switched from the second transmission mode to the first transmission mode. In other words, if an incoherent event occurs, the network device may determine that the transmission mode of the terminal device is switched from the second transmission mode to the first transmission mode, for example, from CJT to NCJT or DJT.

S502: the network device sends first indication information to the terminal device. Accordingly, the terminal device receives the first indication information from the network device.

The first indication information is used for indicating precoding information. When the network device determines that the transmission mode of the terminal device is the first transmission mode, the terminal device can be informed of precoding information corresponding to the first transmission mode through the first indication information. For example, when it is determined that the transmission mode of the terminal device is the NCJT transmission mode, the precoding information indicated by the first indication information may be a precoding matrix of the NCJT transmission mode; or when the transmission mode of the terminal device is determined to be the DJT transmission mode, the precoding information indicated by the first indication information may be invalid information, and when the transmission mode of the terminal device is determined to be the CJT transmission mode, the precoding information indicated by the first indication information may be a precoding matrix of the CJT transmission mode. The first indication information may be carried through DCI.

S503: the terminal device determines the transmission mode as a first transmission mode.

The terminal device determining that the transmission mode is the first transmission mode may be any one of the following possible implementations:

a first possible implementation: the terminal device determines the transmission mode as the first transmission mode by itself, which can be understood as the terminal device determines the transmission mode by itself to switch from the second transmission mode to the first transmission mode. Specifically: if the terminal device is between the first time and the second time, if the first condition is satisfied, that is, the above-defined incoherent event occurs, the terminal device may determine that the transmission mode is switched from the second transmission mode to the first transmission mode.

It will be appreciated that this implementation may be applicable to a transmission mode of a terminal device being switched from CJT to NCJT or DJT.

A second possible implementation: after the network device determines that the transmission mode of the terminal device is the first transmission mode, it may be understood that the network device determines that the transmission mode of the terminal device is switched from the second transmission mode to the first transmission mode (for example, if the network device determines that an incoherent event occurs between the first time and the second time in step S501, it may determine that the transmission mode of the terminal device is switched from the second transmission mode to the first transmission mode), then second indication information may be sent to the terminal device, where the second indication information is used to indicate that the transmission mode of the terminal device is the first transmission mode, so that the terminal device may determine that the transmission mode is switched from the second transmission mode to the first transmission mode according to the second indication information.

It will be appreciated that this implementation may be applicable to a terminal device where the transmission mode is switched from CJT to NCJT or DJT, or vice versa.

A third possible implementation: prior to step S501, the network device may pre-configure the transmission mode of the terminal device to one or more terminal devices with which it communicates. For example, the network device may send third indication information to the terminal device, where the third indication information is used to indicate that the transmission mode is the second transmission mode. So that the terminal device can determine the transmission mode to be the second transmission mode according to the network device.

Further, after the terminal device determines that the transmission mode is the second transmission mode, second indication information of the network device is received, and the transmission mode is determined to be switched from the second transmission mode to the first transmission mode according to the second indication information, namely, the transmission mode is determined to be the first transmission mode. The second indication information and the third indication information may be configured through RRC signaling, and this embodiment may be understood that the network device preconfigures (third indication information) the transmission mode of the terminal device to the second transmission mode through RRC, and when determining that the transmission mode is switched, may reconfigure (second indication information) the transmission mode of the terminal device to the first transmission mode through RRC.

Or further, after the terminal device determines that the transmission mode is the second transmission mode, in the case that the terminal device determines that the second transmission mode cannot be used by itself, request information may be sent to the network device, where the request information is used to request to re-determine the transmission mode. After receiving the request information from the terminal device, the network device may determine, according to the request information, that the transmission mode of the terminal device is switched from the first transmission mode to the second transmission mode, and then send the second indication information to the terminal device.

A fourth possible implementation: the network equipment sends a plurality of RNTIs to the terminal equipment, and different RNTIs correspond to different transmission modes. For example, a first RNTI is used for CJT transmission, a second RNTI is used for NCJT transmission, and a third RNTI is used for DJT transmission. The network device may pre-configure the terminal device with a plurality of RNTIs through RRC signaling. The terminal device may determine that the transmission mode is a first transmission mode according to a first RNTI of the plurality of RNTIs, where the first RNTI is used to scramble DCI carrying the first indication information or CRC bits included in the DCI. For example, the first RNTI is any RNTI of multiple RNTIs, and after receiving the first indication information from the network device, the terminal device may determine that the transmission mode is the first transmission mode corresponding to the first RNTI according to the DCI for scrambling the first indication information or the first RNTI of the CRC bit included in the DCI.

Optionally, the first indication information may further include a TPMI field, and the codebook set corresponding to the precoding matrix indicated by the TPMI field in the first indication information may be associated with the transmission mode, that is, in different transmission modes, the codebook set corresponding to the precoding matrix indicated by the TPMI field is different. The terminal device may determine, according to the TPMI field in the first indication information, that the transmission mode is a transmission mode corresponding to the TPMI field. For example, the first indication information includes a first TPMI field, and after the terminal device receives the first indication information from the network device, the terminal device may determine that the transmission mode is a first transmission mode corresponding to the first TPMI field according to the first TPMI field in the first indication information.

In summary, the first, second and fourth possible implementations have smaller delays for switching transmission modes for the terminal device than the third possible implementation.

S504: the terminal equipment determines precoding according to the first indication information and the first transmission mode.

The terminal device determines that the transmission mode is the first transmission mode, and may determine precoding according to the first indication information and the first transmission mode. Specifically, the transmission mode of the terminal device is determined to be a first transmission mode, and the precoding information indicated by the first indication information is precoding information corresponding to the first transmission mode.

Optionally, the first indication information may further include a TPMI field, where the set of codebooks corresponding to the precoding matrices indicated by the TPMI field in different transmission modes is different. The terminal device determines precoding, which may be understood as determining an indicated precoding matrix or a codebook set corresponding to the precoding matrix according to the TPMI field corresponding to the first transmission mode.

Further, for example, when the TPMI index indicated by the TPMI field in the first indication information is an invalid value or a reserved index value, the terminal device may determine that the first transmission mode is a DJT transmission mode, because the DJT transmission mode may not need to indicate the precoding matrix. In this case, the first terminal device and the second terminal device may not employ the precoding matrix indicated by TPMI. For another example, when the TPMI index indicated by the TPMI field in the first indication information is a valid value or an unreserved index value, the terminal device may determine that the first transmission mode is an NCJT transmission mode. In this case, the first terminal device and the second terminal device may determine respective precoding matrices in the NCJT transmission mode.

The precoding sets used in different transmission modes and the correspondence between each codeword in the precoding set and the TPMI field are described in detail below. Since the DJT may acquire diversity gain directly with cyclic shift without indicating precoding, precoding set construction may be exemplified below with cqt and NCJT.

In one embodiment, the network device may send the first indication information to different terminal devices through the same DCI. For example, in the case of using 1 DCI to indicate precoding information of the first terminal device and the second terminal device, since the first terminal device and the second terminal device share 1 DCI, the network device may send a common RNTI to different terminal devices before sending the first indication information, e.g., configure a common RNTI through RRC signaling, where the common RNTI is used to scramble the DCI carrying the first indication information or CRC bits contained in the DCI, e.g., define a group RNTI. The network device may also indicate precoding information of different terminal devices through different precoding matrix indexes, such as the CJT and NCJT transmission modes shown in tables 4 and 5.

Table 4 precoding information indication in cqt transmission mode

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As shown in table 4, the cqt transmission mode uses the same bit length to indicate TPMI indexes, for example, 6 bits may be used in the table, and a total of 64 indexes may be indicated. The terminal device may determine a codebook set corresponding to the TPMI index according to the TPMI index, for example, may determine the codebook set corresponding to the TPMI index according to an existing protocol. Specifically, it is assumed in table 4 that the first terminal device and the second terminal device each have 2 antenna ports, which are equivalent to 4 antenna ports when cqt transmission is performed. When the CJT transmission mode is adopted, the TPMI field indicates a CJT codebook of 4 antenna ports, and the codebook set may be a codebook set of 4 antenna ports when an existing protocol single terminal device is used for transmission.

Table 5 precoding information indication in NCJT transmission mode

As shown in table 5, the NCJT transmission mode uses the same bit length to indicate TPMI indexes, e.g., 6 bits may be used in the table, and a total of 64 indexes may be indicated. The terminal device may determine a codebook set corresponding to the TPMI index according to the TPMI index, for example, may determine the codebook set corresponding to the TPMI index according to an existing protocol. Specifically, it is assumed in table 5 that the first terminal device and the second terminal device each have 2 antenna ports, and when the NCJT transmission mode is adopted, the TPMI field indicates an NCJT codebook of the 2 antenna ports. Because the NCJT transmission mode is adopted, the first terminal device and the second terminal device determine precoding according to respective channels, that is, determine codebook sets according to respective antenna port numbers.

Precoding information of different terminal equipments may be indicated by different partial bits of the TPMI index in the DCI. The TPMI field bits may be split, for example, the TPMI field has K bits, the K bits may be split into a plurality of partial bits to respectively indicate precoding information of a plurality of terminal devices, for example, 2 terminal devices are taken as an example, the K bits may be split into two parts, which are respectively a first part of bits and a second part of bits, where the first part of bits includes M bits with the highest field, and the second part includes N bits with the lowest field, where k=m+n, where M and N may be the same or different; for another example, taking 3 terminal devices as an illustration, K bits may be split into three parts, which are respectively a first part bit, a second part bit and a third part bit, where the first part bit includes M bits with the highest field, the second part includes N bits with the lowest field, and the third part bit includes L bits between M bits and N bits, where k=m+n+l, where M, N and L may be the same or different.

For example, as shown in table 5, the TPMI field is exemplified by 6 bits, and the 6 bits may be split into 2 partial bits to indicate precoding information of the first terminal device and the second terminal device, respectively, for example, the 6 bits may be split into two parts, where the first partial bit corresponds to the 3 bits of the highest TIMI field and the second partial bit corresponds to the 3 bits of the lowest TIMI field. For which indexes correspond to the first terminal device or the second terminal device, it can be configured through RRC signaling. It is understood that tables 4 and 5 are merely exemplary, and that if the codebook of the 4-antenna port or the 2-antenna port is changed later, the precoding matrix indicated by the bit value is changed accordingly.

In another embodiment, the network device may send the first indication information to different terminal devices through different DCIs. In the case that different DCIs are used to indicate the precoding information of the first terminal equipment and the second terminal equipment, the network equipment may independently indicate the precoding information of the different terminal equipment through TPMI fields in the different DCIs. Such as the indication of precoding information in CJT and NCJT transmission modes shown in table 6.

Table 6 precoding information indication in CJT and NCJT transmission modes

As shown in table 6, the first terminal device and the second terminal device may determine precoding according to a precoding matrix index indicated when bit values in TPMI fields in respective DCIs are 0 to 8. The terminal device may determine a codebook set corresponding to the TPMI index according to the TPMI index, for example, may determine the codebook set corresponding to the TPMI index according to an existing protocol. In one embodiment, in the case of transmitting the first indication information to different terminal devices through different DCIs, the network device may indicate the precoding information of the different terminal devices through the same precoding matrix index (e.g., 0-7 shown in table 6).

S505: and the terminal equipment sends data to the network equipment through the PUSCH according to the first transmission mode and the precoding. Accordingly, the network device receives data from the terminal device through the PUSCH according to the first transmission mode.

After determining that the transmission mode is the first transmission mode and the precoding corresponding to the first transmission mode, the terminal device may send data to the network device through PUSCH according to the first transmission mode and the precoding.

It can be understood that, in the present application, transmitting data through PUSCH may also be understood as transmitting PUSCH, and these two descriptions may be interchanged, which are collectively described herein, and will not be described in detail later.

It will be understood by those of ordinary skill in the art that, in various embodiments of the present application, the sequence numbers of the above-described processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The method embodiments provided by the embodiments of the present application are described above, and the embodiments of the apparatus related to the embodiments of the present application are described below.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application, where the communication device may be a terminal device, or may be a device (for example, a chip, or a chip system, or a circuit) in the terminal device. As shown in fig. 6, the communication device 600 includes at least: a receiving unit 601, a determining unit 602, and a transmitting unit 603; wherein:

A receiving unit 601, configured to receive first indication information from a network device, where the first indication information is used to indicate precoding information;

a determining unit 602, configured to determine that the transmission mode is a first transmission mode;

a determining unit 602, configured to determine precoding according to the first indication information and the first transmission mode;

a transmitting unit 603, configured to transmit data to the network device through the PUSCH according to the first transmission mode and the precoding.

In one embodiment, the determining unit 602 is specifically configured to:

In one embodiment, the first time is a time when SRS is transmitted, and the second time is a time when data is transmitted through PUSCH, and SRS is used to determine precoding.

In one embodiment, the determining unit 602 is specifically configured to:

In one embodiment, before determining that the transmission mode is the first transmission mode, the determining unit 602 is further configured to receive third indication information from the network device, where the third indication information is used to indicate that the transmission mode is the second transmission mode; and determining the transmission mode as a second transmission mode according to the third indication information.

In one embodiment, after the determining unit 602 determines that the transmission mode is the second transmission mode, the sending unit 603 is further configured to send request information to the network device, where the request information is used to request to re-determine the transmission mode.

In one embodiment, the first indication information is configured by DCI or RRC signaling and the third indication information is configured by RRC signaling.

In one embodiment, the receiving unit 601 is further configured to receive multiple RNTIs from the network device, where different RNTIs correspond to different transmission modes.

In one embodiment, the determining unit 602 is specifically configured to: and determining that the transmission mode is the first transmission mode according to a first RNTI in the plurality of RNTIs, wherein the first RNTI is used for scrambling DCI carrying the first indication information or CRC bits contained in the DCI.

In one embodiment, the first indication information further includes a TPMI field, and in different transmission modes, codebook sets corresponding to precoding matrices indicated by the TPMI field are different; the determining unit 602 is specifically configured to: and determining a codebook set corresponding to the precoding matrix of the first transmission mode according to the first transmission mode and the TPMI field.

For more detailed descriptions of the receiving unit 601, the determining unit 602, and the transmitting unit 603, reference may be directly made to the related descriptions of the terminal device in the method embodiment shown in fig. 5, which are not repeated herein.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another communication apparatus provided in the embodiment of the present application, where the communication apparatus may be a network device, or may be an apparatus (for example, a chip, or a chip system, or a circuit) in the network device. As shown in fig. 7, the communication device 700 includes at least: a determination unit 701, a transmission unit 702, and a reception unit 703; wherein:

a determining unit 701, configured to determine that a transmission mode of the terminal device is a first transmission mode;

a sending unit 702, configured to send first indication information to a terminal device, where the first indication information is used to indicate precoding information;

a receiving unit 703, configured to receive data from the terminal device through the PUSCH according to a first transmission mode, where the precoding is determined by the first indication information and the first transmission mode.

In one embodiment, the determining unit 701 is specifically configured to: between the first time and the second time, if a first condition is satisfied, determining that the transmission mode of the terminal device is the first transmission mode, the first condition including at least one of: the variation of the transmitting power of the terminal equipment exceeds a preset threshold; switching uplink and downlink channels of the terminal equipment; the wave beam of the terminal equipment is switched; the TA of the terminal device is adjusted.

In one embodiment, the first time is a time when the terminal device generates SRS, and the second time is a time when the terminal device transmits data through PUSCH, where the SRS is used to determine precoding.

In one embodiment, the sending unit 702 is further configured to send second indication information to the terminal device, where the second indication information is used to indicate that the transmission mode of the terminal device is the first transmission mode.

In one embodiment, the determining unit 701 is further configured to determine that the transmission mode of the terminal device is the second transmission mode;

the sending unit 702 is further configured to send third indication information to the terminal device, where the third indication information is used to indicate that the transmission mode of the terminal device is the second transmission mode.

In one embodiment, the receiving unit 703 is further configured to receive request information from the terminal device, where the request information is used to request to re-determine the transmission mode;

The sending unit 702 is further configured to send the first indication information to the terminal device.

In one embodiment, first indication information is sent to different terminal devices through the same DCI; or sending the first indication information to different terminal equipment through different DCIs.

In one embodiment, in the case that the sending unit 702 sends the first indication information to different terminal devices through the same DCI, the sending unit 702 is further configured to send a common RNTI to different terminal devices, where the common RNTI is used to scramble DCI carrying the first indication information or CRC bits contained in the DCI.

In one embodiment, in the case that the transmitting unit 702 transmits the first indication information to different terminal devices through the same DCI, precoding information of the different terminal devices is indicated through different part bits of the TPMI field in the DCI; alternatively, in the case where the transmitting unit 702 transmits the first indication information to different terminal apparatuses through different DCIs, precoding information of different terminal apparatuses is independently indicated through TPMI fields in the different DCIs.

In one embodiment, the sending unit 702 is further configured to: and sending a plurality of RNTIs to the terminal equipment, wherein different RNTIs correspond to different transmission modes.

In one embodiment, the first indication information further includes a TPMI field, and the set of codebooks corresponding to the precoding matrix indicated by the TPMI field is different in different transmission modes.

For more detailed descriptions of the determining unit 701, the transmitting unit 702 and the receiving unit 703, reference may be directly made to the related descriptions of the network device in the method embodiment shown in fig. 5, which are not repeated herein.

Based on the above network architecture, please refer to fig. 8, fig. 8 is a schematic structural diagram of another communication device according to an embodiment of the present application. As shown in fig. 8, the apparatus 800 may include one or more processors 801, where the processor 801 may also be referred to as a processing unit and may implement certain control functions. The processor 801 may be a general purpose processor or a special purpose processor, or the like. For example, a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processor may be used to control communication devices (e.g., base stations, baseband chips, terminals, terminal chips, DUs or CUs, etc.), execute software programs, and process data of the software programs.

In an alternative design, the processor 801 may also store instructions 803 and/or data, where the instructions 803 and/or data may be executed by the processor, such that the apparatus 800 performs the method described in the method embodiments above.

In another alternative design, the processor 801 may include a transceiver unit for implementing the receive and transmit functions. For example, the transceiver unit may be a transceiver circuit, or an interface circuit, or a communication interface. The transceiver circuitry, interface or interface circuitry for implementing the receive and transmit functions may be separate or may be integrated. The transceiver circuit, interface or interface circuit may be used for reading and writing codes/data, or the transceiver circuit, interface or interface circuit may be used for transmitting or transferring signals.

In yet another possible design, apparatus 800 may include circuitry to implement the functions of transmitting or receiving or communicating in the foregoing method embodiments.

Optionally, the apparatus 800 may include one or more memories 802, on which instructions 804 and/or data may be stored, the instructions 804 and/or data being executable on the processor such that the apparatus 800 performs the methods described in the method embodiments above. Optionally, the memory may further store data. In the alternative, the processor may store instructions and/or data. The processor and the memory may be provided separately or may be integrated. For example, the correspondence described in the above method embodiments may be stored in a memory or in a processor.

Optionally, the apparatus 800 may further comprise a transceiver 805 and/or an antenna 806. The processor 801 may be referred to as a processing unit and controls the apparatus 800. The transceiver 805 may be referred to as a transceiver unit, a transceiver circuit, a transceiver device, a transceiver module, or the like, for implementing a transceiver function.

Alternatively, the apparatus 800 in the embodiments of the present application may be used to perform the method described in fig. 5 in the embodiments of the present application.

In an embodiment, the communication apparatus 800 may be a terminal device, or may be an apparatus (for example, a chip, or a chip system, or a circuit) in the terminal device, where the processor 801 is configured to perform the operations performed by the determining unit 602 in the foregoing embodiment when the computer program instructions stored in the memory 802 are executed, and the transceiver 805 is configured to perform the operations performed by the receiving unit 601 and the transmitting unit 603 in the foregoing embodiment, and the transceiver 805 is further configured to transmit information to other communication apparatuses other than the communication apparatus. The above terminal device or the apparatus in the terminal device may also be used to execute the various methods executed by the terminal device in the above embodiment of the method of fig. 5, which are not described herein.

In an embodiment, the communication apparatus 800 may be a network device, or may be an apparatus (for example, a chip, or a chip system, or a circuit) in the network device, where the processor 801 is configured to perform the operations performed by the determining unit 701 in the foregoing embodiment when the computer program instructions stored in the memory 802 are executed, and the transceiver 805 is configured to perform the operations performed by the transmitting unit 702 and the receiving unit 703 in the foregoing embodiment, and the transceiver 805 is further configured to receive information from other communication apparatuses other than the communication apparatus. The above network device or the apparatus in the network device may also be used to execute the various methods executed by the network device in the above embodiment of the method of fig. 5, which are not described herein.

The processors and transceivers described herein may be implemented on integrated circuits (integrated circuit, ICs), analog ICs, radio Frequency Integrated Circuits (RFICs), mixed signal ICs, application specific integrated circuits (application specific integrated circuit, ASICs), printed circuit boards (printed circuit board, PCBs), electronic devices, and the like. The processor and transceiver may also be fabricated using a variety of IC process technologies such as complementary metal oxide semiconductor (complementary metal oxide semiconductor, CMOS), N-type metal oxide semiconductor (NMOS), P-type metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (Bipolar Junction Transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

The apparatus described in the above embodiment may be the first communication device or the second communication device, but the scope of the apparatus described in the present application is not limited thereto, and the structure of the apparatus may not be limited by fig. 8. The apparatus may be a stand-alone device or may be part of a larger device. For example, the device may be:

(1) A stand-alone integrated circuit IC, or chip, or system-on-a-chip or subsystem;

(2) Having a set of one or more ICs, which may optionally also include storage means for storing data and/or instructions;

(3) An ASIC, such as a modem (MSM);

(4) Modules that may be embedded within other devices;

(5) Receivers, terminals, smart terminals, cellular telephones, wireless devices, handsets, mobile units, vehicle devices, network devices, cloud devices, artificial intelligence devices, machine devices, home devices, medical devices, industrial devices, etc.;

(6) Others, and so on.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present application. For convenience of explanation, fig. 9 shows only major components of the terminal device. As shown in fig. 9, the terminal device 900 includes a processor, a memory, a control circuit, an antenna, and an input-output means. The processor is mainly used for processing the communication protocol and the communication data, controlling the whole terminal, executing the software program and processing the data of the software program. The memory is mainly used for storing software programs and data. The radio frequency circuit is mainly used for converting a baseband signal and a radio frequency signal and processing the radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user.

When the terminal is started, the processor can read the software program in the storage unit, analyze and execute the instructions of the software program and process the data of the software program. When data is required to be transmitted wirelessly, the processor carries out baseband processing on the data to be transmitted and then outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit processes the baseband signal to obtain a radio frequency signal and transmits the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is transmitted to the terminal, the radio frequency circuit receives a radio frequency signal through the antenna, the radio frequency signal is further converted into a baseband signal, and the baseband signal is output to the processor, and the processor converts the baseband signal into data and processes the data.

For ease of illustration, fig. 9 shows only one memory and processor. In an actual terminal, there may be multiple processors and memories. The memory may also be referred to as a storage medium or storage device, etc., and embodiments of the present application are not limited in this regard.

As an alternative implementation manner, the processor may include a baseband processor, which is mainly used to process the communication protocol and the communication data, and a central processor, which is mainly used to control the whole terminal, execute a software program, and process the data of the software program. The processor in fig. 9 integrates the functions of a baseband processor and a central processing unit, and those skilled in the art will appreciate that the baseband processor and the central processing unit may be separate processors, interconnected by bus technology, etc. Those skilled in the art will appreciate that a terminal may include multiple baseband processors to accommodate different network formats, and that a terminal may include multiple central processors to enhance its processing capabilities, with various components of the terminal being connectable via various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, which is executed by the processor to realize the baseband processing function.

In one example, the antenna and the control circuit having the transmitting and receiving function may be regarded as the transmitting and receiving unit 901 of the terminal device 900, and the processor having the processing function may be regarded as the processing unit 902 of the terminal device 900. As shown in fig. 9, the terminal device 900 includes a transceiver unit 901 and a processing unit 902. The transceiver unit may also be referred to as a transceiver, transceiver device, etc. Alternatively, the device for implementing the receiving function in the transceiver unit 901 may be regarded as a receiving unit, and the device for implementing the transmitting function in the transceiver unit 901 may be regarded as a transmitting unit, that is, the transceiver unit 901 includes a receiving unit and a transmitting unit. For example, the receiving unit may also be referred to as a receiver, a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, a transmitting circuit, etc. Alternatively, the receiving unit and the transmitting unit may be integrated together, or may be a plurality of independent units. The receiving unit and the transmitting unit may be located in one geographical location or may be distributed among a plurality of geographical locations.

In one embodiment, the processing unit 902 is configured to perform the operations performed by the determining unit 602 in the above embodiment, and the transceiver unit 901 is configured to perform the operations performed by the receiving unit 601 and the transmitting unit 603 in the above embodiment. The terminal device 900 may also be used to execute various methods executed by the terminal device in the embodiment of the method of fig. 5, which are not described herein.

The embodiment of the present application also provides a computer readable storage medium, on which a computer program is stored, where the program when executed by a processor may implement a procedure related to a terminal device in the transmission mode determining method provided in the foregoing method embodiment.

The embodiment of the present application also provides a computer readable storage medium, on which a computer program is stored, where the program when executed by a processor may implement a procedure related to a network device in the transmission mode determining method provided in the foregoing method embodiment.

Embodiments of the present application also provide a computer program product which, when run on a computer or processor, causes the computer or processor to perform one or more steps of any one of the transmission mode determination methods described above. The respective constituent modules of the above-mentioned apparatus may be stored in the computer-readable storage medium if implemented in the form of software functional units and sold or used as independent products.

The embodiment of the application further provides a chip system, which comprises at least one processor and a communication interface, wherein the communication interface and the at least one processor are interconnected through a line, and the at least one processor is used for running a computer program or instructions to execute part or all of the steps of any one of the embodiments of the method corresponding to fig. 5. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

The embodiment of the application also discloses a communication system, which comprises a terminal device and a network device, and the transmission mode determining method shown in fig. 5 can be specifically described.

It should be understood that the memories mentioned in the embodiments of the present application may be volatile memories or nonvolatile memories, or may include both volatile and nonvolatile memories. The nonvolatile memory may be a hard disk (HDD), a Solid State Drive (SSD), a read-only memory (ROM), a Programmable ROM (PROM), an Erasable Programmable ROM (EPROM), an electrically erasable programmable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory in the embodiments of the present application may also be circuitry or any other device capable of implementing a memory function for storing program instructions and/or data.

It should also be appreciated that the processors referred to in the embodiments of the present application may be central processing units (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), off-the-shelf programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

Note that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, the memory (storage module) is integrated into the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

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

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

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

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

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

The steps in the method of the embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs.

The modules/units in the device of the embodiment of the application can be combined, divided and deleted according to actual needs.

The above embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A transmission mode determination method, comprising:

receiving first indication information from network equipment, wherein the first indication information is used for indicating precoding information;

determining that the transmission mode is a first transmission mode;

determining precoding according to the first indication information and the first transmission mode;

and sending data to the network equipment through a Physical Uplink Shared Channel (PUSCH) according to the first transmission mode and the precoding.

2. The method of claim 1, wherein the determining that the transmission mode is the first transmission mode comprises:

between a first time and a second time, determining that the transmission mode is the first transmission mode if a first condition is satisfied, the first condition including at least one of:

the variation of the transmitting power of the terminal equipment exceeds a preset threshold;

switching uplink and downlink channels of the terminal equipment;

the wave beam of the terminal equipment is switched;

the timing advance TA of the terminal equipment is adjusted.

3. The method of claim 2, wherein the first time instant is a time instant when a channel sounding reference signal, SRS, is transmitted, and the second time instant is a time instant when data is transmitted over the PUSCH, the SRS being used to determine the precoding.

4. The method of claim 1, wherein the determining that the transmission mode is the first transmission mode comprises:

receiving second indication information from the network equipment, wherein the second indication information is used for indicating that the transmission mode of the terminal equipment is the first transmission mode;

5. The method of any of claims 1-4, wherein prior to determining that the transmission mode is the first transmission mode, the method further comprises:

receiving third indication information from the network equipment, wherein the third indication information is used for indicating that the transmission mode is a second transmission mode;

and determining the transmission mode as the second transmission mode according to the third indication information.

6. The method of claim 5, wherein after determining that the transmission mode is the second transmission mode, the method further comprises:

and sending request information to the network equipment, wherein the request information is used for requesting to re-determine the transmission mode.

7. The method of claim 5, wherein the first indication information is configured by downlink control information, DCI, or radio resource control, RRC, signaling, and the third indication information is configured by RRC signaling.

8. The method according to claim 1, wherein the method further comprises:

and receiving a plurality of Radio Network Temporary Identifiers (RNTIs) from the network equipment, wherein different RNTIs correspond to different transmission modes.

9. The method of claim 8, wherein the determining that the transmission mode is the first transmission mode comprises:

And determining that the transmission mode is the first transmission mode according to a first RNTI in the plurality of RNTI, wherein the first RNTI is used for scrambling DCI carrying the first indication information or Cyclic Redundancy Check (CRC) bits contained in the DCI.

10. The method according to any one of claims 1-9, wherein the first indication information further includes a transmission precoding indication TPMI field, and in different transmission modes, codebook sets corresponding to precoding matrices indicated by the TPMI field are different;

the determining precoding according to the first indication information and the first transmission mode includes:

and determining a codebook set corresponding to a precoding matrix of the first transmission mode according to the first transmission mode and the TPMI field.

11. A transmission mode determination method, comprising:

determining a transmission mode of the terminal equipment as a first transmission mode;

sending first indication information to the terminal equipment, wherein the first indication information is used for indicating precoding information;

and receiving data from the terminal equipment through a Physical Uplink Shared Channel (PUSCH) according to the first transmission mode, wherein the precoding is determined by the first indication information and the first transmission mode.

12. The method of claim 11, wherein the determining that the transmission mode of the terminal device is the first transmission mode comprises:

and between the first time and the second time, if a first condition is met, determining that the transmission mode of the terminal equipment is the first transmission mode, wherein the first condition comprises at least one of the following:

switching uplink and downlink channels of the terminal equipment;

the wave beam of the terminal equipment is switched;

the timing advance TA of the terminal equipment is adjusted.

13. The method of claim 12, wherein the first time is a time when the terminal device transmits a channel sounding reference signal, SRS, and the second time is a time when the terminal device transmits data over the PUSCH, the SRS being used to determine the precoding.

14. The method of claim 11, wherein the method further comprises:

and sending second indication information to the terminal equipment, wherein the second indication information is used for indicating that the transmission mode of the terminal equipment is the first transmission mode.

15. The method according to any one of claims 11-14, further comprising:

Determining that the transmission mode of the terminal equipment is a second transmission mode;

and sending third indication information to the terminal equipment, wherein the third indication information is used for indicating that the transmission mode of the terminal equipment is the second transmission mode.

16. The method of claim 15, wherein the method further comprises:

receiving request information from the terminal equipment, wherein the request information is used for requesting to re-determine the transmission mode;

and sending the first indication information to the terminal equipment.

17. The method of claim 15, wherein the first indication information is configured by downlink control information, DCI, or radio resource control, RRC, signaling, and the third indication information is configured by RRC signaling.

18. The method of claim 17, wherein the first indication information is sent to different terminal devices through the same DCI; or sending the first indication information to different terminal equipment through different DCIs.

19. The method of claim 18, wherein the method further comprises:

and sending a public Radio Network Temporary Identifier (RNTI) to the different terminal equipment, wherein the public RNTI is used for scrambling DCI carrying the first indication information or Cyclic Redundancy Check (CRC) bits contained in the DCI.

20. The method of claim 18, wherein in the case where the first indication information is transmitted to different terminal devices through the same DCI, precoding information of different terminal devices is indicated through different part bits of a transmission precoding indication TPMI field in the DCI; or, in the case of sending the first indication information to different terminal devices through different DCIs, the precoding information of the different terminal devices is independently indicated through the TPMI fields in the different DCIs.

21. The method of claim 11, wherein the method further comprises:

and sending a plurality of Radio Network Temporary Identifiers (RNTIs) to the terminal equipment, wherein different RNTIs correspond to different transmission modes.

22. The method according to any one of claims 11-21, wherein the first indication information further includes a TPMI field, and the set of codebooks corresponding to the precoding matrix indicated by the TPMI field is different in different transmission modes.

23. A communication device comprising means for performing the method of any of claims 1-10.

24. A communication device comprising means for performing the method of any of claims 11-22.

25. A communication device comprising a processor, a memory, an input interface for receiving information from a communication device other than the communication device, and an output interface for outputting information to a communication device other than the communication device, the memory storing a computer program which, when called by the processor, causes

The method of any one of claims 1-10 being implemented; or alternatively

The method according to any of claims 11-22 being implemented.

26. A computer readable storage medium, wherein the computer readable storage medium has stored therein a computer program or computer instructions which, when executed by a processor, cause

The method of any one of claims 1-10 being implemented; or alternatively

The method according to any of claims 11-22 being implemented.

27. A system on a chip comprising at least one processor, a memory, and an interface circuit, wherein the memory, the interface circuit, and the at least one processor are interconnected by a line, and wherein the at least one memory has instructions stored therein; the instructions, when executed by the processor, cause

The method of any one of claims 1-10 being implemented; or alternatively

The method according to any of claims 11-22 being implemented.

28. A communication system comprising the communication apparatus of claims 23 and 24.