CN111182631B

CN111182631B - Uplink transmission method and device

Info

Publication number: CN111182631B
Application number: CN201811341576.9A
Authority: CN
Inventors: 黄秋萍; 陈润华; 高秋彬
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-11-12
Filing date: 2018-11-12
Publication date: 2022-06-21
Anticipated expiration: 2038-11-12
Also published as: CN111182631A

Abstract

The embodiment of the invention provides an uplink transmission method and equipment, which can indicate an uplink transmission mode between a base station and a terminal, so that the base station and the terminal understand based on the same uplink transmission mode, and the performance of uplink transmission is ensured. In addition, the embodiment of the invention can also solve the problem that at least part of the terminals can not reach the maximum transmitting power during the uplink low rank transmission. Meanwhile, the uplink scheduling information of the uplink signal can be calculated more effectively, and the performance of uplink transmission is improved.

Description

Uplink transmission method and device

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to an uplink transmission method and equipment.

Background

The codebook-based uplink transmission scheme is a multi-antenna transmission technique for determining an uplink transmission precoding matrix based on a fixed codebook. In a New Radio Access Technology (5G NR) system of a fifth-generation communication Technology, an uplink transmission scheme based on a codebook is similar to a basic principle of an uplink spatial multiplexing Technology in a Long Term Evolution (LTE) system, but the codebook and a precoding indication mode are different. As shown in fig. 1, in the NR system, the flow of the codebook-based uplink transmission scheme includes:

1) user Equipment (UE) sends, to a base station, an uplink Sounding Reference Signal (SRS) for acquiring uplink transmission scheme Channel State Information (Channel State Information) based on a codebook.

2) The base station performs Uplink Channel detection according to an SRS sent by the UE, performs resource scheduling on the UE, determines an SRS resource corresponding to Uplink transmission, a number of layers of the Uplink transmission, and a Precoding Matrix, and further determines a Modulation and Coding Scheme (MCS) level of the Uplink transmission according to the Precoding Matrix and Channel information, and then notifies the UE of resource allocation of a Physical Uplink Shared Channel (PUSCH) and a corresponding MCS, a Transmission Precoding Matrix Indicator (TPMI), a number of transmission layers, and a corresponding SRS Resource Indicator (SRI).

3) And the UE modulates and codes the data according to the MCS indicated by the base station, determines a precoding matrix and the number of transmission layers used when the data is sent by using the indicated SRI, TPMI and the number of transmission layers, and then precodes and sends the data. The demodulation pilot frequency of the PUSCH and the data of the PUSCH adopt the same precoding mode.

4) And the base station estimates an uplink channel according to the demodulation pilot signal and performs data detection.

For Multiple Input Multiple Output (MIMO) transmission of a UE, characteristics of a transmission antenna and a radio frequency of the UE are greatly different from those of a base station, and a codebook design needs to fully consider correlation characteristics between antennas. When the two antenna ports satisfy the coherence condition, the UE may perform data transmission of the same layer simultaneously by using the two antenna ports through precoding to obtain an array gain. However, due to the influence of factors such as mutual coupling effect of antenna elements, feeder line difference, and variation of amplifier phase and gain of radio frequency path, the difference in power and phase inevitably exists between each port of the actual UE antenna. Limited by cost and design, not all UEs can calibrate each antenna port to the extent necessary to meet coherent transmission requirements. For the UE which cannot perform antenna coherent transmission, a large difference may exist between the phase difference between the UE antennas when the base station calculates the TPMI and the phase difference between the antennas when the UE performs PUSCH transmission after receiving the TPMI, and if the TPMI indicates that the antennas which cannot perform coherent transmission are used for transmission of the same data layer, the optimal uplink transmission precoding of the terminal may not be the precoding indicated by the TPMI, that is, the terminal performs PUSCH transmission by using the precoding indicated by the TPMI, and cannot obtain good performance.

The NR system defines antenna coherent transmission capabilities for three UEs:

1) full-coherent (full-coherent): all antennas can transmit coherently;

2) partial-coherence (partial-coherence): the antennas in the same coherent transmission group can carry out coherent transmission, coherent transmission groups cannot carry out coherent transmission, and each coherent transmission group comprises 2 antennas;

3) non-coherent (non-coherent): no antenna can transmit coherently.

The antenna coherence transmission capability of the UE is indicated by the codebook subset restriction supported by the UE. The codebook subset restriction supported by the UE in the 3GPP R15NR protocol TS 38.331V15.3.0(2018-09) is indicated by the pusch-transmorence in MIMO-parametersperbands:

when the pusch-transport conference reported by the UE is a nonCoherent, the UE can be understood as a non-coherent transmission capability UE; when the pusch-transmference reported by the UE is a partial non-coding, the UE can be understood as a partially coherent transmission capability UE; when the pusch-transmission code reported by the UE is called fullcohere, the UE can be understood as a UE with full coherent transmission capability. The base station may send codebook subset restriction signaling to the UE based on the antenna coherent transmission capability of the UE, restricting the UE from using a portion of codewords therein for uplink transmission. The codebook subset restriction signaling indicated by the base station for the UE in the 3GPP R15NR protocol TS 38.331V15.3.0(2018-09) is codebook subset restriction signaling in PUSCH-Config, as follows:

in LTE and NR systems, the multi-antenna power allocation scheme for PUSCH with uplink MIMO is: the UE will calculate the transmit power according to the uplink power control formula (e.g., in NR system, version TS 38.213 V15.3.0(2018-09) is P in section 7.1.1_PUSCH,b,f,c(i,j,q_dL)) according to the ratio of the port number of the actual transmission signal in the total port number configured for the transmission mode corresponding to the PUSCH by the base station, carrying out power scaling, and then evenly dividing the scaled power on the antenna port of the actual transmission signal. For example, assume that 4antenna ports are configured for uplink transmission, and the precoding matrix indicated by the base station is

Because the base station configures 4antenna ports for uplink transmission, and only 2antenna ports in the precoding matrix are nonzero, if the transmission power calculated by the UE according to the PUSCH power control formula is P, the actual transmission power of the PUSCH is P/2, wherein the transmission power of the first antenna port and the third antenna port is P/2The transmission power is P/4 each. This scaling does not require that each antenna port of the UE can reach maximum transmit power, allowing the UE to implement multiple antenna functionality using lower cost radio frequency components.

From the UE performance point of view, when the UE is located at the cell edge or the channel condition is poor, the base station generally configures the UE with a low rank (or referred to as low transmission stream number) transmission and transmits data at the maximum transmission power as possible. Under the codebook design of the NR system, for codebook-based uplink transmission, a UE with partial antenna coherent transmission capability and non-coherent transmission capability always has a part of antenna ports without PUSCH transmission at low rank transmission. Therefore, the current uplink MIMO multi-antenna power allocation mechanism cannot ensure that the UE with partial antenna coherent transmission capability and non-coherent transmission capability can reach the maximum transmission power during low rank transmission under the codebook-based uplink transmission scheme, thereby reducing the performance of the UE at the cell edge and affecting the coverage of the cell.

The basic principle of Cyclic Delay Diversity (CCD) is to transmit signals transmitted on a plurality of antennas used by a transmitting end in parallel after Cyclic shift. Cyclic delay diversity translates spatial diversity into frequency diversity through cyclic delay transmission of signals. Fig. 2 shows an example in which the cyclic delay of CDD occurs before the cyclic prefix, and at this time, the equivalent delay offset is not limited by CP, so that the frequency selectivity of the equivalent channel can be improved without increasing the actual signal delay spread. For the receiving end, the cyclic delay is equivalent to the variation of the equivalent channel, so the CDD can also be regarded as a space-time code, and the complexity of the receiver is not increased. Of course, the cyclic delay of CDD may also occur after the cyclic prefix, which may increase the delay spread of the actual signal.

CDD may be used in conjunction with spatial precoding techniques. For example, the long-delay CDD technique adopted by TM3 in downlink of LTE system is a technique combining CDD and spatial precoding technique. The uplink of the current LTE system and the uplink of the NR system do not support the CDD scheme.

When the UE is a UE with partial coherent transmission capability, a transmission method combining CDD and precoding is as follows:

the UE first precodes the transmitted signal with precoding and then performs transmit diversity transmission in the non-coherent antenna group. For a UE with non-coherent transmission capability of 2antenna ports, the transmission diagram is shown in fig. 3. Fig. 4 shows a transmission diagram of a UE supporting 4antenna ports and having a partially coherent transmission capability when configured with a partially coherent transmission codeword. The precoding of 4antenna single streams can be split into 2 x 1 precodes, where one precoding uses a first pair of groups of coherent transmission antennas and the second precoding uses a second pair of groups of coherent transmission antennas. This precoding can be seen as virtualizing two virtual antenna ports for non-coherent transmission to one antenna port. In the second step, uplink transmission is performed on the two groups of virtual antenna ports by using a CDD (cyclic redundancy check) mode.

A basic principle of a cyclic precoding (precoding) transmission scheme is transmission using cyclic precoding at different times or different frequencies for signals transmitted on a plurality of antennas used at a transmitting end. For example, for single stream transmission with 2-antenna transmission, precoding [ 11 ] is used]^TAnd [ 1-1 ]]^TOne way to perform cyclic precoding is: use on odd PRBs [ 11]^TPrecoding a transmitted signal using [ 1-1 on even PRBs]^TThe signal is precoded. According to the granularity of cyclic precoding, cyclic precoding may be performed at a Physical Resource Block (PRB) level, at a Resource Element (RE) level, at a subband level, and the like.

In the existing system of 3GPP NR, for a UE with partially coherent transmission capability and a UE with non-coherent transmission capability, when low rank transmission is performed in a codebook-based uplink transmission scheme configured with multiple antenna ports, the transmit power of a terminal cannot reach the maximum transmit power. The UE of 3GPP R15 cannot reach the maximum uplink transmit power when performing transmission in which the number of non-codebook uplink multi-antenna ranks (rank) configured with multiple antenna ports is smaller than the number of configured antenna ports. This will reduce the performance of the UE at the cell edge, affecting the coverage of the cell.

In addition, for the UE with CDD transmission capability, the UE can obtain transmission diversity gain by CDD transmitting uplink signals, thereby improving performance. However, if the UE determines whether to transmit the uplink signal through CDD, the base station (e.g., the gNB) does not know whether the UE transmits the uplink channel using CDD, which may result in that the gNB cannot better determine the uplink scheduling information of the uplink signal, thereby affecting the performance of uplink transmission.

Disclosure of Invention

An object of the embodiments of the present invention is to provide an uplink transmission method and apparatus, which can indicate an uplink transmission mode between a base station and a terminal, so that the base station and the terminal understand based on the same uplink transmission mode, thereby ensuring the performance of uplink transmission.

The embodiment of the invention provides an uplink transmission method, which is applied to a terminal and comprises the following steps:

receiving first indication information sent by a base station, wherein the first indication information is used for indicating whether the terminal adopts a first transmission mode to transmit an uplink signal, and the first transmission mode is an uplink transmission mode based on CCD (charge coupled device) or antenna delay or cyclic precoding.

Preferably, after receiving the first indication information, the method further comprises:

if the first indication information indicates that the terminal transmits the uplink signal in the first transmission mode, the terminal performs uplink transmission in the first transmission mode when a first predetermined condition is met, where the first predetermined condition includes: receiving a first precoding code word with the transmission stream number X indicated by a base station, wherein X is a positive integer.

Preferably, X is 1.

Preferably, the first indication information is precoding indication information of the uplink signal, where when the status of the precoding indication information is a first status, the precoding indication information indicates the terminal to transmit the uplink signal by using the first transmission mode.

Preferably, the precoding indication information includes at least one of the first states.

Preferably, under the restriction of the codebook corresponding to the uplink signal or the codebook subset corresponding to the uplink signal, the precoding indication information includes a first state when corresponding to the number X of transmission streams, where X is a positive integer.

Preferably, the method further comprises:

and when a second preset condition is met, the terminal adopts the first transmission mode to carry out uplink transmission, wherein the second preset condition comprises that: the received state of the precoding indication information of the uplink signal is the first state.

Preferably, the first predetermined condition or the second predetermined condition further includes: the base station indicates a non-coherent codebook subset for the codebook subset restriction information indicated by the terminal;

alternatively, the first and second electrodes may be,

the first predetermined condition or the second predetermined condition further comprises: the codebook subset restriction information indicated by the base station for the terminal indicates a non-coherent codebook subset or a partially coherent codebook subset.

Preferably, the first indication information is further configured to indicate a precoding codeword of the uplink signal, where when a coherence attribute of the precoding codeword exceeds coherence transmission capability of the terminal, the first indication information indicates that the terminal transmits the uplink signal in the first transmission mode.

Preferably, the precoding codeword is a codeword in a first codebook subset indicated by the base station for the terminal, the first codebook subset includes at least one first type codeword and at least one second type codeword corresponding to the number X of transmission streams, a coherence attribute of the first type codeword does not exceed a coherence transmission capability of the terminal, a coherence attribute of the second type codeword exceeds the coherence transmission capability of the terminal, and X is a positive integer; and when the precoding code word belongs to the second class of code words, the first indication information indicates the terminal to transmit the uplink signal by adopting the first transmission mode.

Preferably, the first codebook subset is an incoherent codebook subset, the first class of codewords are incoherent codewords, and the second class of codewords are partially coherent codewords or fully coherent codewords; alternatively, the first and second electrodes may be,

the first codebook subset is a partial coherent codebook subset, the first class of codewords are partial coherent codewords, and the second class of codewords are full coherent codewords.

Preferably, when the first codebook subset is a non-coherent codebook subset, the second type of codeword only includes a fully coherent codeword corresponding to the number X of transmission streams;

when the first codebook subset is a partial coherent codebook subset, the second type of codeword includes only one fully coherent codeword corresponding to the number X of transmission streams.

Preferably, the first indication information includes:

and the base station indicates the codebook subset restriction information of the uplink signal for the terminal, and when the codebook subset restriction information corresponds to a predetermined second codebook subset, the codebook subset restriction information indicates the terminal to transmit the uplink signal by adopting the first transmission mode.

Preferably, the first indication information includes:

the base station limits the codebook subset of the uplink signal indicated by the terminal, and indicates the precoding information of the uplink signal; when the codebook subset restriction information indicates a predetermined third codebook subset and the precoding indication information indicates any precoding codeword or a predetermined second precoding codeword in the third codebook subset, the first indication information indicates that the terminal transmits the uplink signal by using the first transmission mode.

Preferably, the method further comprises:

the third codebook subset is a codebook subset that can only be indicated to a first class of terminals, and the first class of terminals are terminals with uplink transmission capability of the first transmission mode.

Preferably, the coherence property of the second precoding codeword exceeds the coherence transmission capability of the terminal.

Preferably, the third codebook subset includes at least one third type codeword and at least one fourth type codeword corresponding to the number X of transmission streams, where a coherence attribute of the third type codeword does not exceed a coherence transmission capability of the terminal, a coherence attribute of the fourth type codeword exceeds the coherence transmission capability of the terminal, the second precoding codeword belongs to the fourth type codeword, and X is a positive integer.

Preferably, the fourth type of codeword comprises only one codeword corresponding to a fully coherent transmission with a number X of transmission streams.

Preferably, when the coherent transmission capability of the terminal is non-coherent transmission, the second precoding codeword is a codeword of partial coherent transmission or full coherent transmission;

and when the coherence transmission capability of the terminal is partial coherence transmission, the second precoding codeword is a codeword of full coherence transmission.

Preferably, before the step of receiving the first indication information sent by the base station, the method further includes:

and reporting third indication information whether the terminal has the uplink transmission capability of the first transmission mode to a base station.

Preferably, after receiving the first indication information, the method further includes:

and if the first indication information is used for indicating the terminal to adopt the first transmission mode to transmit the uplink signal, the terminal adopts the first transmission mode to perform uplink transmission.

and when the first indication information is used for indicating the terminal to transmit the uplink signal by adopting the first transmission mode and the terminal uses the pre-coding code word containing the number of the non-zero antenna ports more than 1 to transmit the uplink signal, the terminal uses the antenna corresponding to the non-zero antenna port in the pre-coding code word to perform uplink transmission by adopting the first transmission mode.

Preferably, when the terminal performs uplink transmission by using the first transmission method, only small-delay CCD or small-delay antenna transmission is performed between the coherent transmission antenna groups, and antennas in the same coherent transmission antenna group use the same delay.

Preferably, the performing uplink transmission by using the first transmission method includes:

when the terminal uses the noncoherent precoding code words to transmit the uplink signals and the terminal uses the partially coherent precoding code words to transmit the uplink signals, different schemes of a first transmission mode are adopted; and/or the presence of a gas in the gas,

and when the terminal uses the fully coherent precoding code words to transmit the uplink signals and uses the partially coherent precoding code words to transmit the uplink signals, different schemes of the first transmission mode are adopted.

Preferably, the method further comprises:

receiving precoding indication information of the uplink signal indicated by the base station for the terminal;

and determining precoding of the uplink signal corresponding to the precoding indication information according to whether the uplink transmission capability of the first transmission mode is indicated by the third indication information.

Preferably, the first indication information is indicated by at least one of RRC signaling, MAC-CE signaling, and DCI.

The embodiment of the invention also provides an uplink transmission method, which is applied to a base station and comprises the following steps:

the base station sends first indication information to a terminal, wherein the first indication information is used for indicating whether the terminal adopts a first transmission mode to transmit uplink signals, and the first transmission mode is an uplink transmission mode based on CCD (charge coupled device) or antenna delay or cyclic precoding.

Preferably, before the first indication information is sent, the method further includes:

and the base station calculates uplink scheduling information of the uplink signal based on the assumption that the terminal adopts the first transmission mode to transmit the uplink signal under a preset condition, wherein the preset condition comprises that the first indication information indicates that the terminal adopts the first transmission mode to transmit the uplink signal.

Preferably, after sending the first indication information, the method further includes:

and receiving the uplink signal in a mode corresponding to the first transmission mode.

Preferably, the predetermined condition further includes: a first precoding codeword with a transmission stream number X is indicated to the terminal.

Preferably, X is 1.

Preferably, the first indication information is precoding indication information of the uplink signal, where the precoding indication information indicates that the terminal transmits the uplink signal in the first transmission mode when the state of the precoding indication information is the first state.

Preferably, the predetermined condition further includes at least one of a first condition and a second condition;

wherein the first condition is:

the base station indicates a non-coherent codebook subset for the codebook subset restriction information indicated by the terminal; or the like, or, alternatively,

the base station indicates a non-coherent codebook subset or a partially coherent codebook subset for the codebook subset restriction information indicated by the terminal;

the second condition is:

the terminal has non-coherent transmission capability; or

The terminal has a partially coherent transmission capability.

Preferably, when the first codebook subset is a non-coherent codebook subset, the second type of codeword only includes one fully coherent codeword corresponding to the number X of transmission streams;

Preferably, the first indication information includes:

and the base station indicates codebook subset restriction information of the uplink signal for the terminal, and when the codebook subset restriction information corresponds to a predetermined second codebook subset, the codebook subset restriction information indicates the terminal to transmit the uplink signal by adopting the first transmission mode.

Preferably, the first indication information includes:

the base station limits information for the codebook subset indicated by the terminal, and indicates precoding information of the uplink signal; when the codebook subset restriction information indicates a predetermined third codebook subset and the precoding indication information indicates any precoding codeword or a predetermined second precoding codeword in the third codebook subset, the first indication information indicates that the terminal transmits the uplink signal by using the first transmission mode.

Preferably, the third codebook subset is a codebook subset that can only be indicated to a first class of terminals, and the first class of terminals are terminals with uplink transmission capability of the first transmission mode.

Preferably, the fourth type of codeword comprises only codewords corresponding to one fully coherent transmission of the number X of transmission streams.

Preferably, when the coherent transmission capability of the terminal is non-coherent transmission, the third precoding codeword is a codeword of partial coherent transmission or full coherent transmission;

and when the coherence transmission capability of the terminal is partial coherence transmission, the third precoding codeword is a codeword of full coherence transmission.

Preferably, before the step of sending the first indication information, the method further comprises:

receiving third indication information whether the terminal has the uplink transmission capability of the first transmission mode or not, wherein the third indication information is reported by the terminal;

and when the terminal supports the first transmission mode, sending first indication information to the terminal.

Preferably, the method further comprises:

indicating the precoding indication information of the uplink signal to a terminal; the precoding of the uplink signal indicated by the precoding indication information of the same value is different according to whether the uplink transmission capability of the first transmission mode is indicated by the third indication information.

An embodiment of the present invention provides a terminal, including: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor;

the transceiver is configured to receive first indication information sent by a base station, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

Preferably, the processor is configured to read a program in the memory, and execute the following processes: if the first indication information indicates that the terminal transmits the uplink signal by adopting the first transmission mode, performing uplink transmission by adopting the first transmission mode when a first preset condition is met, wherein the first preset condition comprises that: receiving a first precoding code word with the transmission stream number X indicated by a base station, wherein X is a positive integer.

Preferably, X is 1.

Preferably, the transceiver is further configured to perform uplink transmission by using the first transmission method when a second predetermined condition is met, where the second predetermined condition includes: the received precoding indication information of the uplink signal is in the first state.

alternatively, the first and second electrodes may be,

Preferably, the first codebook subset is an incoherent codebook subset, the first class of codewords are incoherent codewords, and the second class of codewords are partially coherent codewords or fully coherent codewords; alternatively, the first and second liquid crystal display panels may be,

Preferably, the first indication information includes:

the base station limits the codebook subset of the uplink signal indicated by the terminal, and indicates the precoding information of the uplink signal; when the codebook subset restriction information indicates a predetermined third codebook subset and the precoding indication information indicates any precoding codeword or a predetermined second precoding codeword in the third codebook subset, the first indication information indicates the terminal to transmit the uplink signal by using the first transmission mode.

Preferably, the fourth type of codeword comprises only one codeword corresponding to a full coherent transmission with a number X of transmission streams.

Preferably, the transceiver is further configured to report, to the base station, third indication information indicating whether the terminal has the uplink transmission capability of the first transmission mode before receiving the first indication information sent by the base station.

Preferably, the transceiver is further configured to perform uplink transmission in the first transmission mode after receiving the first indication information, if the first indication information is used to indicate the terminal to transmit an uplink signal in the first transmission mode.

Preferably, after receiving the first indication information, the transceiver is further configured to use an antenna corresponding to a non-zero antenna port in a precoding codeword to perform uplink transmission in the first transmission mode when the first indication information is used to indicate that the terminal transmits an uplink signal in the first transmission mode and the terminal performs uplink signal transmission using the precoding codeword that includes a non-zero antenna port number greater than 1.

Preferably, the transceiver is further configured to perform, when the terminal performs uplink transmission in the first transmission mode, only small-delay CCD or small-delay antenna transmission between coherent transmission antenna groups, where antennas in the same coherent transmission antenna group use the same delay.

Preferably, the transceiver is further configured to adopt different schemes of a first transmission mode when the terminal uses a non-coherent precoding codeword to perform the transmission of the uplink signal and when the terminal uses a partially coherent precoding codeword to perform the transmission of the uplink signal; and/or adopting different schemes of the first transmission mode when the terminal uses the fully coherent precoding code words to transmit the uplink signals and the terminal uses the partially coherent precoding code words to transmit the uplink signals.

Preferably, the transceiver is further configured to receive precoding indication information of the uplink signal indicated by the base station for the terminal;

the processor is further configured to determine precoding of an uplink signal corresponding to the precoding indication information according to whether the uplink transmission capability of the first transmission mode is available, which is indicated by the third indication information.

The embodiment of the invention also provides another terminal, which comprises:

a receiving unit, configured to receive first indication information sent by a base station, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, and the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

An embodiment of the present invention provides a base station, including: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor;

the transceiver is configured to send first indication information to a terminal, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

Preferably, the processor is configured to read a program in the memory, and execute the following processes: before the first indication information is sent, calculating uplink scheduling information of an uplink signal based on an assumption that the terminal performs transmission of the uplink signal in the first transmission mode under a predetermined condition, where the predetermined condition includes that the first indication information indicates that the terminal transmits the uplink signal in the first transmission mode.

Preferably, after sending the first indication information, the base station further includes:

Preferably, X is 1.

wherein the first condition is:

the second condition is:

the terminal has non-coherent transmission capability; or

The terminal has a partially coherent transmission capability.

Preferably, the first codebook subset is a non-coherent codebook subset, the first type of codeword is a non-coherent codeword, and the second type of codeword is a partially coherent codeword or a fully coherent codeword; alternatively, the first and second liquid crystal display panels may be,

Preferably, the first indication information includes:

Preferably, the transceiver is further configured to receive, before sending the first indication information, third indication information that is reported by a terminal and that whether the terminal has the uplink transmission capability of the first transmission mode; and when the terminal supports the first transmission mode, sending first indication information to the terminal.

Preferably, the transceiver is further configured to indicate precoding indication information of the uplink signal to a terminal; the precoding of the uplink signal indicated by the precoding indication information of the same value is different according to whether the uplink transmission capability of the first transmission mode is indicated by the third indication information.

The embodiment of the present invention further provides another base station, including:

a sending unit, configured to send first indication information to a terminal, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

Embodiments of the present invention also provide a computer-readable storage medium including instructions, which when executed on a computer, cause the computer to perform the uplink transmission method as described above.

The uplink transmission method and the device provided by the embodiment of the invention can indicate the uplink transmission mode between the base station and the terminal, so that the base station and the terminal understand based on the same uplink transmission mode, and the performance of uplink transmission is ensured. In addition, the embodiment of the invention can also solve the problem that at least part of terminals can not reach the maximum transmitting power during the uplink low rank transmission. Meanwhile, the uplink scheduling information of the uplink signal can be calculated more effectively, and the performance of uplink transmission is improved.

Drawings

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

FIG. 1 is a flowchart illustrating a codebook-based uplink transmission scheme in the prior art;

FIG. 2 shows a schematic diagram of the cyclic delay processing of a prior art CDD;

FIG. 3 is a schematic diagram of a combined CDD and precoding transmission scheme in the prior art;

FIG. 4 is a schematic diagram of another CDD and precoding transmission scheme in the prior art;

fig. 5 is a block diagram of a wireless communication system to which embodiments of the present invention are applicable;

fig. 6 is a flowchart illustrating an uplink transmission method according to an embodiment of the present invention;

fig. 7 is another flowchart illustrating an uplink transmission method according to an embodiment of the present invention;

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

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

Fig. 10 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 11 is another schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.

The techniques described herein are not limited to Long Time Evolution (LTE)/LTE Evolution (LTE-Advanced, LTE-a) and NR systems, and may also be used for various wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (Wideband Code Division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 1102.11(Wi-Fi), IEEE 1102.16(WiMAX), IEEE 1102.20, Flash-OFDM, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. NR, UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in literature from an organization entitled "third Generation Partnership Project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes the NR system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications.

The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Referring to fig. 5, fig. 5 is a block diagram of a wireless communication system to which an embodiment of the present invention is applicable. The wireless communication system includes a terminal 51 and a base station 52. The terminal 51 may also be referred to as a user terminal or ue (user equipment), where the terminal 51 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device, and the specific type of the terminal 51 is not limited in the embodiment of the present invention. The base station 52 can be a 5G or later release base station (e.g., a gNB, a 5G NR NB, etc.), or a base station in other communication systems (e.g., an eNB, a WLAN access point, or other access points, etc.), wherein, a Base Station may be referred to as a node B, an evolved node B, an access point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, and it should be noted that, in the embodiment of the present invention, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

The base stations 52 may communicate with the terminals 51 under the control of a base station controller, which may be part of the core network or some of the base stations in various examples. Some base stations may communicate control information or user data with the core network through a backhaul. In some examples, some of these base stations may communicate with each other directly or indirectly over backhaul links, which may be wired or wireless communication links. A wireless communication system may support operation on multiple carriers (waveform signals of different frequencies). A multi-carrier transmitter can transmit modulated signals on the multiple carriers simultaneously. For example, each communication link may be a multi-carrier signal modulated according to various radio technologies. Each modulated signal may be transmitted on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, and so on.

Base station 52 may communicate wirelessly with terminals 51 via one or more access point antennas. Each base station may provide communication coverage for a respective coverage area. The coverage area of an access point may be partitioned into sectors that form only a portion of the coverage area. A wireless communication system may include different types of base stations (e.g., macro, micro, or pico base stations). The base stations may also utilize different radio technologies, such as cellular or WLAN radio access technologies. The base stations may be associated with the same or different access networks or operator deployments. The coverage areas of different base stations (including coverage areas of base stations of the same or different types, coverage areas utilizing the same or different radio technologies, or coverage areas belonging to the same or different access networks) may overlap.

The communication links in a wireless communication system may comprise an Uplink for carrying Uplink (UL) transmissions (e.g., from terminal 51 to base station 52) or a terminal for carrying Downlink (DL) transmissions (e.g., from base station 52 to user equipment 51). The UL transmission may also be referred to as reverse link transmission, while the DL transmission may also be referred to as forward link transmission. Downlink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both. Similarly, uplink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both.

The embodiment of the invention provides an uplink transmission method, which can indicate an uplink transmission mode between a base station and a terminal, so that the base station and the terminal understand based on the same uplink transmission mode, and the performance of uplink transmission is ensured. Referring to fig. 6, an embodiment of the present invention provides an uplink transmission method applied to a terminal side, including:

and step 61, receiving first indication information sent by the base station, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

Here, in this embodiment of the present invention, the first transmission mode is an uplink transmission mode based on a CCD, or an uplink transmission mode based on antenna delay, or an uplink transmission mode based on cyclic precoding. Preferably, the Uplink Signal may be one or more of a PUSCH, a Physical Uplink Control Channel (PUCCH), a DeModulation Reference Signal (DMRS) of the PUSCH, a DMRS of the PUCCH, and a DMRS of the PUCCH, but the embodiment of the present invention is not limited to the above signals. The upstream signal may be some type of the above-mentioned signal. For example, the signal is a PUSCH based on a codebook transmission scheme. The first indication information may specifically be indicated by any one of RRC signaling, MAC-CE signaling, and DCI, or may be indicated by a combination of multiple types of signaling/messages.

Through the steps, the base station can send the relevant indication to the terminal, and the terminal obtains the relevant indication of the base station to determine whether the first transmission mode is adopted to transmit the uplink signal, so that the same understanding of the uplink transmission mode can be realized between the base station and the terminal, and the performance of uplink transmission is ensured.

The Cyclic Delay Diversity (CCD) in this embodiment includes, but is not limited to, transmitting signals transmitted on a plurality of antennas used by the transmitting end in parallel after Cyclic shift. An example where the cyclic delay of the CDD occurs before the cyclic prefix is given in fig. 2. Optionally, the CDD or antenna delay in the embodiment of the present invention is a small delay CDD or small delay antenna delay.

Optionally, the CDD in the embodiment of the present invention is a CDD mode that the CDD can be used in combination with a spatial precoding technology. For example, the CDD technique adopted by the TM3 in the downlink of the LTE system or the extension of the CDD technique adopted by the TM3 in the downlink of the LTE system may be adopted, for example, by adopting other delays or other relative phases between antennas, or by adopting other precoding.

Optionally, in the embodiment of the present invention, antenna delay or CDD or cyclic precoding is performed between all antennas of the UE.

Optionally, in the embodiment of the present invention, antenna delay or CDD is performed between coherent antenna groups (coherent antenna port groups) of the UE, and antenna delay or CDD is not performed in one coherent antenna group of the UE. For example, when the UE is a UE with partially coherent transmission capability, the transmission mode may be a combination of CDD and precoding as shown in fig. 4:

Optionally, the embodiment of the present invention uses the following transmission mode of antenna delay (CDD): and precoding the data stream of the uplink signal by using the following formula:

wherein x is^(u)(i) A data symbol with a sequence number i in a data stream with a sequence number u representing an uplink signal, and v represents the number of data streams; d (i) represents a square matrix with dimension P × P corresponding to x (i), where P represents the number of antenna ports corresponding to the uplink signal configured for the terminal;

indicating the signal symbol obtained after layer mapping and previous steps (e.g. encoding, modulation, etc.) of uplink data (note that the uplink data may be data transmitted on PUSCH, data transmitted on PUCCH, etc.; W₀(i) Representing a reference precoding matrix with dimension P × ν corresponding to x (i); y is^(p)(i) Denotes symbols mapped to antenna ports p corresponding to x (i), and p denotes the serial number of the antenna port.

Denotes symbols mapped onto respective antenna ports corresponding to x (i),

indicating the number of data symbols contained in one data layer,

indicating the number of data symbols mapped to one antenna port. Here, optionally, the reference precoding matrix W₀(i) Is a precoding matrix that the base station indicates to the terminal through the TPMI. For example, for 3GPP NR systems, TPMI may be indicated by an indication in DCI, or by a higher layer parameter, depending on the grant (grant) manner of PUSCH. Optionally, the reference precoding matrix W₀(i) But also a pre-defined precoding matrix.

The cyclic precoding (precoding) transmission scheme in the embodiment of the present invention includes, but is not limited to, a cyclic precoding manner in a downlink quasi-open loop semi-open loop in an LTE system, that is, a transmission method that uses cyclic precoding at different times or different frequencies for signals transmitted on multiple antennas used by a transmitting end. For example, for single stream transmission with 2-antenna transmission, precoding [ 11 ] is used]^TAnd [ 1-1 ]]^TMethod for cyclic precodingThe formula is as follows: use on odd PRBs [ 11]^TPrecoding a transmitted signal using [ 1-1 on even PRBs]^TThe signal is precoded. According to the granularity of cyclic precoding, cyclic precoding may be performed at a Physical Resource Block (PRB) level, at a Resource Element (RE) level, at a subband level, and the like.

Optionally, the embodiment of the present invention only applies antenna delay or CDD or cyclic precoding to the non-zero antenna corresponding to the precoding of the uplink signal.

Further, after receiving the first indication information in step 61, the method may further include the following steps: if the first indication information indicates that the terminal transmits the uplink signal in the first transmission mode, the terminal performs uplink transmission in the first transmission mode when a first predetermined condition is met, where the first predetermined condition includes: receiving a first precoding code word with the transmission stream number X indicated by a base station, wherein X is a positive integer.

That is to say, after receiving the first indication information, if the terminal further receives the first precoding codeword indicated by the base station, the terminal performs uplink transmission by using the first transmission mode. And if the first precoding code word is not received, the terminal can not adopt the first transmission mode to carry out uplink transmission.

Optionally, the first precoding code word is pre-agreed by the base station and the terminal. For example, the base station indicates to the terminal through signaling, or the terminal indicates to the base station, or the protocol is agreed.

Optionally, the first precoding code word is a precoding code word with a number of all transmission streams being X, where X is a positive integer smaller than a maximum number of transmission streams supported by the terminal.

Optionally, the first precoding code word is a precoding code word with a number of all transmission streams being X, where X is a positive integer smaller than a maximum number of antenna ports supported by a terminal. Preferably, X ═ 1, or, X ═ 1 or 2.

Here, preferably, the number X of transmission streams of the first precoding code word is 1. As an extension manner, in the embodiment of the present invention, no matter which first precoding codeword with a transmission stream number of 1 is indicated by the base station, the terminal performs uplink transmission by using the first transmission manner. Of course, the embodiment of the present invention may also stipulate in advance that the first precoding code word is a predetermined code word with a transmission stream number of 1, and the terminal performs uplink transmission by using the first transmission mode only when receiving the predetermined code word.

Further, the first predetermined condition may further include that the codebook subset restriction information indicated by the base station for the terminal indicates a predetermined codebook subset. The predetermined precoding subset may be predetermined by the base station and the terminal, for example, indicated to the terminal by signaling from the base station, or indicated to the base station by the terminal, or agreed by a protocol. Optionally, the predetermined precoding subset is a non-coherent codebook subset (e.g., codebook denoted by the base station for the terminal is non coherent). In this case, after the step 61, if the codebook subset restriction information indicated by the base station for the terminal indicates a non-coherent codebook subset and the terminal receives the first precoding codeword indicated by the base station, the terminal performs uplink transmission in the first transmission scheme.

Preferably, the first predetermined condition may further include that the codebook subset restriction information indicated by the base station for the terminal indicates a non-coherent codebook subset or a partially coherent codebook subset (for example, codebook subsets indicated by the base station for the terminal are non-coherent or partial anti-dnoncoherent). In this case, after the step 61, if the codebook subset restriction information indicated by the base station for the terminal indicates a non-coherent codebook subset or a partially coherent codebook and the terminal receives the first precoding codeword indicated by the base station, the terminal performs uplink transmission by using the first transmission method.

As an implementation manner of the first indication information, the first indication information may specifically be precoding indication information (e.g., "precoder and transmission link indicator" in DCI) of the uplink signal, where the precoding indication information indicates that the terminal transmits the uplink signal by using the first transmission method when a state of the precoding indication information is a first state. Here, when the state of the precoding indication information is other than the first state, the precoding indication information may indicate that the terminal does not transmit the uplink signal in the first transmission scheme. In this way, after step 61, when a second predetermined condition is satisfied, the terminal performs uplink transmission by using the first transmission method, where the second predetermined condition includes: the received precoding indication information of the uplink signal is in the first state.

Here, the precoding indication information generally includes a plurality of states, which may include at least 1 of the first states. Preferably, under the restriction of the codebook corresponding to the uplink signal or the codebook subset corresponding to the uplink signal, the precoding indication information only includes 1 first state when corresponding to the number X of transmission streams, where X is a positive integer. For example, when a coder and transmission rank indicator in DCI is in a first state, a terminal performs transmission of CDD or antenna delay or cyclic precoding using multiple antennas. Preferably, for the number of transmission streams X, only one state (i.e., the number of first states is 1) of the preamble and transmission rank indicator indicates that the terminal uses multiple antennas for transmission of CDD or antenna delay or cyclic precoding. Alternatively, X ═ 1; alternatively, X is 1 or 2; or X ═ 1, 2, or 3. Optionally, when the number of antenna ports configured by the base station for the transmission mode corresponding to the uplink signal is different, X is different. For example, when the uplink signal is a PUSCH in a codebook-based transmission scheme, if the number of antenna ports allocated by the base station is 2, X is 1; if the number of antenna ports for which the base station is configured is 2, X is 1 or 2.

Preferably, the second predetermined condition may further include that the codebook subset restriction information indicated by the base station for the terminal indicates a predetermined codebook subset. The predetermined precoding subset may be predetermined by the base station and the terminal, for example, indicated to the terminal by signaling from the base station, or indicated to the base station by the terminal, or agreed by a protocol. Optionally, the predetermined precoding subset is a non-coherent codebook subset (e.g., codebook denoted by the base station for the terminal is non coherent). In this case, after step 61, if the codebook subset restriction information indicated by the base station for the terminal indicates the incoherent codebook subset and the state of the precoding indication information of the uplink signal received by the terminal is the first state, the terminal performs uplink transmission by using the first transmission method.

Preferably, the second predetermined condition may further include that the codebook subset restriction information indicated by the base station for the terminal indicates a non-coherent codebook subset or a partially coherent codebook subset (for example, codebook subsets indicated by the base station for the terminal are non-coherent or partial anti-dnoncoherent). At this time, after the step 61, if the codebook subset restriction information indicated by the base station for the terminal indicates an incoherent codebook subset or a partially coherent codebook and the state of the precoding indication information of the uplink signal received by the terminal is the first state, the terminal performs uplink transmission by using the first transmission method.

Several examples of the first indication information being represented by precoding indication information of the uplink signal are given below:

1) extending the Table 7.3.1.1.2-2: decoding information and number of layers, for 4 antipna ports, if transform decoder disabled and maxRank 2or 3or 4 in 3GPP protocol TS38.212V15.3.0(2018-09), the following Table 1 can be obtained:

TABLE 1

In the example of table 1, when codebook subset is non-coherent (indicating that codebook subset is restricted to non-coherent codebook), the first state is a state where Bit field mapped to index is 12, corresponding to transmission by the UE using multiple antennas for CDD or antenna delay or cyclic precoding. When codebook subset is partial antenna precoding, the first state is a state where a Bit field mapped to index is 32, corresponding to transmission by the UE using multiple antennas for CDD or antenna delay or cyclic precoding.

2) Extending the Table 7.3.1.1.2-3: decoding information and number of layers for 4 antipna ports, if transformrecordor ═ enabled, or if transformrecordor ═ disabled and maxRank ═ 1 in 3GPP protocol TS38.212V15.3.0(2018-09), the following Table 2 can be obtained:

TABLE 2

In the example of table 2, when codebook subset is non coherent, the first state is a state where Bit field mapped to index is 4, corresponding to the UE using multiple antennas for CDD or antenna delay or cyclic precoding transmission. When codebook subset is a partial adaptive codebook (indicating that codebook subsets are restricted to partial coherent codebooks), the first state is a state where Bit field mapped to index is 12, corresponding to transmission by the UE using multiple antennas for CDD or antenna delay or cyclic precoding.

3) Extending the Table 7.3.1.1.2-4: Precoding information and number of layers, for 2 antipna ports, if transform decoder disabled and maxRank 2(TS38.212) in the 3GPP protocol TS38.212, the following Table 3 can be obtained:

TABLE 3

In the example of table 3, when codebook subset is non-coherent (indicating that codebook subset is restricted to non-coherent codebook), the first state is a state where Bit field mapped to index is 3, corresponding to transmission by the UE using multiple antennas for CDD or antenna delay or cyclic precoding.

4) Extending the tables Table 7.3.1.1.2-5: decoding information and number of layers, for 2 anti ports, if transform decoder is enabled, or if transform decoder is disabled and maxRank is 1(TS38.212) in the 3GPP protocol TS38.212, the following Table 4 can be obtained:

TABLE 4

In the example of table 4, when codebook subset is non-coherent (indicating that codebook subset is restricted to non-coherent codebook), the first state is a state where Bit field mapped to index is 2, corresponding to transmission by the UE using multiple antennas for CDD or antenna delay or cyclic precoding.

As another implementation manner of the first indication information, the first indication information may also be represented by a precoding codeword of the uplink signal, and at this time, the first indication information is used to indicate not only whether the terminal transmits the uplink signal in the first transmission manner, but also indicate the precoding codeword of the uplink signal, where when a coherence attribute of the precoding codeword exceeds a coherence transmission capability of the terminal, the first indication information indicates that the terminal transmits the uplink signal in the first transmission manner.

Here, the case that the coherence property of a certain codeword exceeds the coherence transmission capability of the terminal may specifically include the following cases:

A) when the coherent transmission capability of the terminal is non-coherent transmission, the coherent attribute of the codeword is a partially coherent codeword or a fully coherent codeword;

B) and when the coherent transmission capability of the terminal is partial coherent transmission, the coherent attribute of the code word is a full coherent code word.

Preferably, when the first indication information is further used to indicate a precoding codeword of the uplink signal, the precoding codeword may be one codeword in a first codebook subset indicated by the base station for the terminal. That is to say, the first indication information may be represented by a precoding codeword of the uplink signal, and at this time, the precoding codeword indicates the precoding codeword of the uplink signal and indicates whether the terminal transmits the uplink signal in the first transmission manner.

Here, the first codebook subset includes at least one first type codeword corresponding to the number X of transmission streams and at least one second type codeword corresponding to the number X of transmission streams, where a coherence property of the first type codeword does not exceed a coherence transmission capability of the terminal, where a coherence property of the second type codeword exceeds the coherence transmission capability of the terminal, where X is a positive integer; and when the precoding code word belongs to the second class of code words, the first indication information indicates the terminal to transmit the uplink signal by adopting the first transmission mode. Alternatively, X ═ 1; or, X ═ 1 or 2; or X ═ 1, 2, or 3.

For example, when the first codebook subset is a non-coherent codebook subset, the first class of codewords may be non-coherent codewords, and the second class of codewords may be partially coherent codewords or fully coherent codewords. Specifically, when the codebook subset limit (codebook subset limit) indicated by the base station is a nonCoherent codebook subset (that is, a nonCoherent codebook subset), the codebook subset limit corresponding to the number X of transmission streams at least includes a codeword that is coherent to a part of antennas or coherent to all antennas, and at this time, when a precoding codeword (precoder) of an uplink signal indicated by the base station is a codeword that is coherent to a part of antennas or coherent to all antennas, the terminal uses a transmission mode of CDD or antenna delay or cyclic precoding. For another example, when the first codebook subset is a partial coherent codebook subset, the first class of codewords may be partial coherent codewords, and the second class of codewords may be full coherent codewords. Specifically, when the codebook subset restriction corresponding to the number X of the transmission streams includes at least one codeword that is coherent to all antennas, the terminal uses a transmission mode of CDD or antenna delay or cyclic precoding when the precoding codeword (precoder) of the uplink signal indicated by the base station is a codeword that is coherent to all antennas. Here, when the base station calculates the uplink scheduling information of the uplink signal and calculates the CSI corresponding to the codeword, it is assumed that the uplink signal uses a transmission scheme of CDD, antenna delay, or cyclic precoding on the non-zero antenna port corresponding to the codeword. Optionally, when calculating uplink scheduling information of the uplink signal corresponding to the codeword, the base station applies CDD or antenna delay or cyclic precoding to an SRS port corresponding to a non-zero antenna port corresponding to the codeword.

Preferably, when the codebook subset restriction corresponding to the number X of transmission streams is nocoherenent, the terminal may include only one codeword that is coherent to all antennas, and when the precoder indicated by the base station is the codeword, the terminal uses a transmission scheme of CDD or antenna delay or cyclic precoding.

Preferably, when the codebook subset restriction indicated by the base station is partial adaptive precoding, only one codeword that is coherent to all antennas may be included in the codebook subset restriction corresponding to the number X of transmission streams, and when the precoder indicated by the base station is the codeword, the transmission method using CDD or antenna delay or cyclic precoding is used.

In a specific implementation, the first indication information may be a coder and transmission rank indicator in the DCI. The specific way that the base station indicates, through the first indication information, that the terminal can perform CDD or antenna delay or cyclic precoding transmission is as follows: and the base station indicates the code word exceeding the coherent transmission capability of the terminal through a coder and transmission rank indicator in the DCI.

Optionally, the terminal may also report to the base station whether it supports the first transmission capability (i.e. the capability of supporting transmission based on CDD or antenna delay or cyclic precoding). The codebook corresponding to the codebook of the same value indicated by the base station may be different between the terminal supporting the first transmission capability and the terminal not supporting the first transmission capability. For example, for a terminal that does not support the first transmission capability, when the codebook indicated by the base station is a non-coherent, the coder and transmission rank indicator may indicate that the codeword is TPMI 0-4 in the 3GPP protocol TS38.211 V15.3.0(2018-09) Table 6.3.1.5-2 or Table 6.3.1.5-3 when 4antenna ports 4 are configured and maxRank is 1, that is, the codebook is a codebook including codewords TPMI 0-4; for the terminal supporting the first transmission capability, when the codebook indicated by the base station is a non-coherent, the codeword that can be indicated by the coder and transmission rank indicator when the 4-antenna port 4 is configured and maxRank is 1 is TPMI 0-4 in 3GPP ts38.211table 6.3.1.5-2 or Table 6.3.1.5-3, and 12, that is, the codebook is a codebook including codewords TPMI 0-4 and 12.

Several examples of the first indication information being represented by a pre-coding codeword of the uplink signal are given below:

when codebook is nonCoherent, the following TPM is used:

·TPMIs 0to 2in 38.211Table 6.3.1.5-1(Single-layer transmission using two antenna ports),

·TPMIs 0to 4,and 12in 38.211Table 6.3.1.5-2(Single layer transmission using four antenna ports with transform precoding),

·TPMIs 0to 4,and 12in 38.211Table 6.3.1.5-3(Single layer transmission using four antenna ports without transform precoding),

·TPMI 0to 7in 38.211Table 6.3.1.5-5(Two layer transmission using four antenna ports without transform precoding),

·and TPMI 0to 2in 38.211Table 6.3.1.5-6(Three layer transmission using four antenna ports without transform precoding).

when codebook is partal anti dnoncoherent, the following TPMI was used:

·TPMIs 0to 12,in 38.211Table 6.3.1.5-2(Single layer transmission using four antenna ports with transform precoding)

·TPMIs 0to 12in 38.211Table 6.3.1.5-3(Single layer transmission using four antenna ports without transform precoding).

as another implementation manner of the first indication information, the first indication information may specifically be codebook subset restriction information of the uplink signal indicated by the base station for the terminal. And when the codebook subset restriction information corresponds to a predetermined second codebook subset, the codebook subset restriction information instructs the terminal to transmit the uplink signal by adopting the first transmission mode. The predetermined second codebook subset is predetermined by the base station and the terminal, for example, indicated to the terminal by signaling from the base station, or indicated to the base station by the terminal, or agreed by a protocol.

As another implementation manner of the first indication information, the first indication information may specifically be indicated by the following information in a combined manner: the base station indicates the codebook subset restriction information of the uplink signal for the terminal, and indicates the precoding information of the uplink signal; when the codebook subset restriction information indicates a predetermined third codebook subset and the precoding indication information indicates any precoding codeword or a predetermined second precoding codeword in the third codebook subset, the first indication information indicates the terminal to transmit the uplink signal by using the first transmission mode.

In this embodiment of the present invention, the second codebook subset or the third codebook subset may be a codebook subset agreed in advance by the terminal and the base station, or a codebook subset indicated to the terminal in advance by the base station, or a codebook subset indicated to the base station in advance by the terminal. When the second precoding code word is a predetermined precoding code word, the second precoding code word may be a precoding agreed in advance by the terminal and the base station, or a precoding indicated to the terminal by the base station in advance.

In this embodiment of the present invention, the second codebook subset or the third codebook subset may be a codebook subset that can only be indicated to a first type of terminal, where the first type of terminal is a terminal having an uplink transmission capability of the first transmission mode. Optionally, the coherence property of the second precoded codeword is beyond a coherence transmission capability of the terminal. For example, when the coherent transmission capability of the terminal is non-coherent transmission, the second precoding codeword is a codeword for partial coherent transmission or full coherent transmission; and when the coherence transmission capability of the terminal is partial coherence transmission, the second precoding codeword is a codeword of full coherence transmission.

In this embodiment of the present invention, the third codebook subset may include at least one third type codeword and at least one fourth type codeword corresponding to the number X of transmission streams, where a coherence attribute of the third type codeword does not exceed a coherence transmission capability of the terminal, a coherence attribute of the fourth type codeword exceeds the coherence transmission capability of the terminal, the second precoding codeword belongs to the fourth type codeword, and X is a positive integer. Preferably, the fourth class of code words may comprise only one code word corresponding to a fully coherent transmission with a number X of transmission streams. Optionally, the third codebook subset only includes one codeword of the third type corresponding to the transport stream X. Alternatively, X ═ 1; or, X ═ 1 or 2; or X ═ 1, 2, or 3. Optionally, when the number of antenna ports configured by the base station for the transmission mode corresponding to the uplink signal is different, X is different. For example, when the uplink signal is a PUSCH in a codebook-based transmission scheme, if the number of antenna ports allocated by the base station is 2, X is 1; if the number of antenna ports for which the base station is configured is 2, X is 1 or 2.

For example, when codebook subset restriction information (codebook subset restriction information) indicated by the base station is a predetermined codebook subset restriction, the terminal may perform uplink transmission using the first transmission method. Preferably, the base station is only able to indicate the predetermined codebook subset restriction for terminals having support for the first transmission capability.

Preferably, the terminal uses the first transmission mode when the codebook subset indicated by the base station is a first codebook subset restriction in the predetermined codebook subset restrictions, when the precoder indicated by the base station is a codeword which is coherent for part of antennas or coherent for all antennas, and/or uses the first transmission mode when the codebook subset indicated by the base station is a second codebook subset restriction in the predetermined codebook subset restrictions, when the precoder indicated by the base station is a codeword which is coherent for all antennas.

Optionally, when the first codebook subset restriction is a nonCoherent codebook subset restriction, the codebook subset restriction corresponding to the number X of transmission streams at least includes a codeword (a fourth type codeword) that is coherent to a partial antenna or coherent to all antennas. The second codebook subset restriction is a partial-coherent codebook subset restriction, and the codebook subset restriction corresponding to the number X of transmission streams contains at least one codeword (fourth-class codeword) coherent to all antennas. Alternatively, X ═ 1; or X is 1 or 2; or X ═ 1, 2, or 3. Optionally, when the number of antenna ports configured by the base station for the transmission mode corresponding to the uplink signal is different, X is different. Optionally, X is different for different codebook subset restrictions.

Optionally, when the base station calculates the CSI (channel State information) of the uplink signal and calculates the CSI corresponding to the codeword, it is assumed that the uplink signal uses the first transmission mode on the nonzero antenna port corresponding to the codeword. Optionally, when calculating the scheduling information of the uplink signal corresponding to the codeword, the base station applies CDD, antenna delay, or cyclic precoding to the SRS port corresponding to the non-zero antenna port corresponding to the codeword.

Preferably, only 1 codeword which is coherent to all antennas may be included in the codebook subset restriction corresponding to the number X of transmission streams in the first codebook subset restriction, and when the precoder indicated by the base station is the codeword, the terminal uses the first transmission mode. Optionally, the codebook subset restriction corresponding to the number X of transmission streams in the second codebook subset restriction only includes 1 codeword that is coherent to all antennas, and when the precoder indicated by the base station is the codeword, the first transmission mode is used.

For example, one example of the above implementation is: the codebook subset restriction codebook ubset signaling of the PUSCH indicated by the base station for the terminal contains candidate values of codebook subset estimated { full and partial N-Council, non-Council, partial N-Council CDD, non-Council CDD },

wherein the non-coherent cdd is the first codebook subset restriction, and the codebook of the single stream contains at least one codeword that is coherent to all antennas; for the partial anti dnoncodebook cdd, the second codebook subset is limited to include at least one codeword that is coherent for all antennas in the single-stream and/or dual-stream codebook.

In the embodiment of the invention, the terminal reports whether the terminal supports the capability of the first transmission mode. As a preferred implementation, the above implementation schemes are adopted only when the terminal reports its capability of supporting the first transmission mode.

In each of the above implementation manners, if the first indication information is used to indicate that the terminal transmits the uplink signal in the first transmission manner, the terminal performs uplink transmission in the first transmission manner.

In this embodiment of the present invention, when the first indication information is used to indicate that the terminal transmits an uplink signal in the first transmission mode, and the terminal uses a precoding codeword that includes a number of non-zero antenna ports greater than 1 to transmit the uplink signal, the terminal may use an antenna corresponding to the non-zero antenna port in the precoding codeword to perform uplink transmission in the first transmission mode.

Preferably, when the terminal performs uplink transmission by using the first transmission method, only small-delay CCD or small-delay antenna transmission is performed between the coherent transmission antenna groups, and antennas in the same coherent transmission antenna group use the same delay. Here, small delay generally refers to a delay less than a predetermined delay threshold.

Optionally, the time delay in the embodiment of the present invention is determined by the terminal itself. Optionally, the terminal reports the time delay to a base station. Optionally, the terminal determines the time delay according to the indication information of the base station.

Preferably, when the terminal needs to perform uplink transmission by using the first transmission method, different schemes of the first transmission method may be respectively used when the terminal uses a non-coherent precoding codeword to perform uplink signal transmission and the terminal uses a partially coherent precoding codeword to perform uplink signal transmission; and/or when the terminal uses the fully coherent precoding code words to transmit the uplink signals and the terminal uses the partially coherent precoding code words to transmit the uplink signals, different schemes of the first transmission mode are respectively adopted.

In this embodiment of the present invention, the terminal may further report, to the base station, third indication information indicating whether the terminal has the uplink transmission capability of the first transmission mode. Further, the terminal may further receive precoding indication information of the uplink signal indicated by the base station for the terminal, and determine precoding of the uplink signal corresponding to the precoding indication information according to whether the uplink transmission capability of the first transmission mode is indicated by the third indication information. That is to say, for different uplink transmission capacities indicated by the third indication information, the precoding of the uplink signal corresponding to the same precoding indication information may be different. Furthermore, the terminal may further receive codebook subset restriction information indicated by the base station, and then determine precoding of an uplink signal according to whether the uplink transmission capability of the first transmission mode is provided or not indicated by the codebook subset restriction information and the third indication information.

The method flow of the terminal side in the embodiment of the present invention is described above. The following will further describe the related aspects of the embodiments of the present invention from the base station side.

Referring to fig. 7, an uplink transmission method provided in an embodiment of the present invention is applied to a base station, and includes:

step 71, the base station sends first indication information to the terminal, where the first indication information is used to indicate whether the terminal transmits the uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

Here, the first indication information may be specifically indicated by any one of RRC signaling, MAC-CE signaling, and DCI, or may be indicated by a combination of multiple types of signaling/messages.

Through the steps, the base station can send the relevant indication to the terminal by the base station, and the terminal obtains the relevant indication of the base station to determine whether the first transmission mode is adopted to transmit the uplink signal, so that the same understanding of the uplink transmission mode can be realized between the base station and the terminal, and the performance of uplink transmission is ensured.

The Cyclic Delay Diversity (CCD) in this embodiment includes, but is not limited to, performing Cyclic shift on signals transmitted on a plurality of antennas used by a transmitting end and then transmitting the signals in parallel. An example where the cyclic delay of the CDD occurs before the cyclic prefix is given in fig. 2. Optionally, the CDD or the antenna delay in the embodiment of the present invention is a small-delay CDD or a small-delay antenna delay.

wherein x is^(u)(i) A data symbol with sequence number i in a data stream with sequence number u representing an uplink signal, and v represents the number of data streams; d (i) represents a square matrix with dimension P × P corresponding to x (i), where P represents the number of antenna ports corresponding to the uplink signal configured for the terminal;

indicating the signal symbol obtained after layer mapping and its previous steps (such as coding and modulation) on the uplink data (note that the uplink data here may be the data transmitted on the PUSCH, the data transmitted on the PUCCH, etc.; W₀(i) Representing a reference precoding matrix with dimension P × ν corresponding to x (i); y is^(p)(i) Denotes symbols mapped to antenna ports p corresponding to x (i), and p denotes the serial number of the antenna port.

Denotes symbols mapped onto respective antenna ports corresponding to x (i),

indicating the number of data symbols contained in one data layer,

The cyclic precoding (precoding cycling) transmission scheme in the embodiment of the present invention includes, but is not limited to, a cyclic precoding manner in a downlink quasi-open loop semi-open loop in an LTE system, that is, a transmission method that uses cyclic precoding at different time or different frequency for signals transmitted on multiple antennas used by a transmitting end. For example, for single stream transmission with 2-antenna transmission, precoding [ 11 ] is used]^TAnd [ 1-1 ]]^TOne way to perform cyclic precoding is: use on odd PRBs [ 11]^TPrecoding the transmitted signal using [1-1]^TThe signal is precoded. According to the granularity of cyclic precoding, cyclic precoding may be performed at a Physical Resource Block (PRB) level, at a Resource Element (RE) level, at a subband level, and the like.

After step 71, the base station may further calculate uplink scheduling information of the uplink signal based on an assumption that the terminal performs transmission of the uplink signal in the first transmission scheme under a predetermined condition, where the predetermined condition includes that the first indication information indicates that the terminal transmits the uplink signal in the first transmission scheme.

After step 71, the base station may further receive the uplink signal in a manner corresponding to the first transmission manner.

Here, the predetermined condition may further include: a first precoding codeword with a transmission stream number X is indicated to the terminal.

Optionally, the first precoding code word is a precoding code word with a total number of all transmission streams being X, where X is a positive integer smaller than a maximum number of transmission streams supported by the terminal.

Optionally, the first precoding code word is a precoding code word with a number of all transmission streams being X, where X is a positive integer smaller than a maximum number of antenna ports supported by the terminal. Preferably, X ═ 1, or, X ═ 1 or 2.

Further, the predetermined condition may further include that the codebook subset restriction information indicated by the base station for the terminal indicates a predetermined codebook subset. The predetermined precoding subset may be predetermined by the base station and the terminal, for example, indicated to the terminal by signaling from the base station, or indicated to the base station by the terminal, or agreed by a protocol. Optionally, the predetermined precoding subset is a non-coherent codebook subset (e.g., codebook denoted by the base station for the terminal is non coherent).

As an implementation manner of the first indication information, the first indication information is precoding indication information of the uplink signal, where when a state of the precoding indication information is a first state, the precoding indication information indicates the terminal to transmit the uplink signal in the first transmission manner. Preferably, the precoding indication information includes at least 1 of the first states. Further, under the restriction of the codebook corresponding to the uplink signal or the codebook subset corresponding to the uplink signal, the precoding indication information may only include 1 first state when corresponding to the number X of transmission streams, where X is a positive integer.

Here, the precoding indication information generally includes a plurality of states, which may include at least 1 of the first states. Preferably, under the restriction of the codebook corresponding to the uplink signal or the codebook subset corresponding to the uplink signal, the precoding indication information only includes 1 first state when corresponding to the number X of transmission streams, where X is a positive integer. For example, when a coder and transmission rank indicator in DCI is in a first state, a terminal performs transmission of CDD or antenna delay or cyclic precoding using multiple antennas. Preferably, for the number of transmission streams X, only one state (i.e., the number of first states is 1) of the decoder and transmission rank indicator indicates that the terminal uses multiple antennas for transmission of CDD or antenna delay or cyclic precoding. Alternatively, X ═ 1; or, X ═ 1 or 2; or X ═ 1, 2, or 3. Optionally, when the number of antenna ports configured by the base station for the transmission mode corresponding to the uplink signal is different, X is different. For example, when the uplink signal is a PUSCH in a codebook-based transmission scheme, if the number of antenna ports allocated by the base station is 2, X is 1; if the number of antenna ports for which the base station is configured is 2, X is 1 or 2.

In the embodiment of the present invention, the predetermined condition may further include at least one of a first condition and a second condition. Wherein the first condition is: the codebook subset restriction information indicated by the base station for the terminal indicates a predetermined codebook subset. The predetermined precoding subset may be predetermined by the base station and the terminal, for example, indicated to the terminal by signaling from the base station, or indicated to the base station by the terminal, or agreed by a protocol. Optionally, the predetermined precoding subset is a non-coherent codebook subset (e.g., codebook denoted by the base station for the terminal is non coherent). Optionally, the predetermined precoding subset may also be a non-coherent codebook subset or a partially coherent codebook subset (for example, the codebook based on the terminal indicated by the base station is non-coherent or partial anti-dnoncoherent).

For example, the first condition may be that the codebook subset restriction information indicated by the base station for the terminal indicates a non-coherent codebook subset; or, the codebook subset restriction information indicated by the base station for the terminal indicates a non-coherent codebook or a partially coherent codebook.

For an example that the first indication information is represented by precoding indication information of the uplink signal, reference may be made to a related table in the terminal side method embodiment, and details are not described here.

Here, the second condition may be:

the terminal has non-coherent transmission capability; or

The terminal has a partially coherent transmission capability.

As another implementation manner of the first indication information, the first indication information is further used to indicate a precoding codeword of the uplink signal, where when a coherence attribute of the precoding codeword exceeds coherence transmission capability of the terminal, the first indication information indicates that the terminal transmits the uplink signal in the first transmission manner.

For example, the precoding codeword is a codeword in a first codebook subset indicated by the base station for the terminal, where the first codebook subset includes at least one first type codeword and at least one second type codeword corresponding to a number X of transmission streams, a coherence property of the first type codeword does not exceed a coherence transmission capability of the terminal, a coherence property of the second type codeword exceeds the coherence transmission capability of the terminal, and X is a positive integer; and when the precoding code word belongs to the second class of code words, the first indication information indicates the terminal to transmit the uplink signal by adopting the first transmission mode.

Specifically, the first codebook subset is an incoherent codebook subset, the first class of codewords are incoherent codewords, and the second class of codewords are partially coherent codewords or fully coherent codewords; or, the first codebook subset is a partial coherent codebook subset, the first class of codewords are partial coherent codewords, and the second class of codewords are full coherent codewords.

Further, when the first codebook subset is a non-coherent codebook subset, the second class of codewords may include only 1 fully coherent codeword corresponding to the number X of transmission streams; when the first codebook subset is a partially coherent codebook subset, the second class of codewords may include only 1 fully coherent codeword corresponding to the number X of transmission streams.

As another implementation manner of the first indication information, the first indication information includes: and the base station indicates codebook subset restriction information of the uplink signal for the terminal, and when the codebook subset restriction information corresponds to a predetermined second codebook subset, the codebook subset restriction information indicates the terminal to transmit the uplink signal by adopting the first transmission mode. The predetermined second codebook subset is predetermined by the base station and the terminal, for example, indicated to the terminal by signaling from the base station, or indicated to the base station by the terminal, or agreed by a protocol.

As another implementation manner of the first indication information, the first indication information may include: the base station limits information for the codebook subset indicated by the terminal, and indicates precoding information of the uplink signal; when the codebook subset restriction information indicates a predetermined third codebook subset and the precoding indication information indicates any precoding codeword or a predetermined second precoding codeword in the third codebook subset, the first indication information indicates that the terminal transmits the uplink signal by using the first transmission mode.

Preferably, the third codebook subset includes at least one third type codeword and at least one fourth type codeword corresponding to the number X of transmission streams, where a coherence attribute of the third type codeword does not exceed a coherence transmission capability of the terminal, a coherence attribute of the fourth type codeword exceeds the coherence transmission capability of the terminal, the second precoding codeword belongs to the fourth type codeword, and X is a positive integer. Further, the fourth type of codeword comprises only codewords corresponding to 1 fully coherent transmission of the number X of transmission streams. Optionally, the third codebook subset only includes one codeword of the third type when corresponding to the transport stream X. Alternatively, X ═ 1; or, X ═ 1 or 2; or X ═ 1, 2, or 3. Optionally, when the number of antenna ports configured by the base station for the transmission mode corresponding to the uplink signal is different, X is different. For example, when the uplink signal is a PUSCH in a codebook-based transmission scheme, if the number of antenna ports allocated by the base station is 2, X is 1; if the number of antenna ports for which the base station is configured is 2, X is 1 or 2.

Optionally, when the first codebook subset restriction is a nonCoherent codebook subset restriction, the codebook subset restriction corresponding to the number X of transmission streams at least includes a codeword (a fourth type codeword) that is coherent to a partial antenna or coherent to all antennas. The second codebook subset restriction is a partial-coherent codebook subset restriction, and the codebook subset restriction corresponding to the number X of the transmission streams at least includes a codeword (fourth-class codeword) coherent to all antennas. Alternatively, X ═ 1; or X ═ 1 or 2; or X ═ 1, 2, or 3. Optionally, when the number of antenna ports configured by the base station for the transmission mode corresponding to the uplink signal is different, X is different. Optionally, X is different for different codebook subset restrictions.

wherein the non-coherent cdd is the first codebook subset restriction, and the codebook of the single stream contains at least one codeword that is coherent to all antennas; and the partial anti-dnoncodebook cdd is a second codebook subset for limiting at least one codeword coherent to all antennas in the codebook of the single stream and/or the dual stream.

In each of the above implementation manners of the embodiment of the present invention, before step 71, the base station may further receive third indication information, which is reported by the terminal, whether the terminal has the uplink transmission capability of the first transmission manner; and sending the first indication information in the step 71 to the terminal when the terminal supports the first transmission mode.

Further, the base station of the embodiment of the present invention may further indicate precoding indication information of the uplink signal to the terminal; the precoding of the uplink signal indicated by the precoding indication information of the same value is different according to whether the uplink transmission capability of the first transmission mode is indicated by the third indication information. Furthermore, the base station may further indicate codebook subset restriction information to the terminal, so that the terminal may determine precoding of the uplink signal according to whether the uplink transmission capability of the first transmission mode is provided or not, which is indicated by the codebook subset restriction information and the third indication information.

The above schemes provide various implementation modes of the first indication information. Alternatively, CDD or antenna delay or cyclic precoding at different numbers of transmission streams may be used with the same implementation. For example, CDD or antenna delay or cyclic precoding for single stream transmission and CDD or antenna delay or cyclic precoding for 2 stream transmission employ the same implementation of the first indication information. Alternatively, CDD or antenna delay or cyclic precoding at different number of transmission streams may be implemented differently. For example, CDD or antenna delay or cyclic precoding for single stream transmission and CDD or antenna delay or cyclic precoding for 2 stream transmission employ different implementations of the first indication information. For example, for single stream CDD or antenna delay or cyclic precoding, the implementation manner indicated by using the first precoding code word, and for two streams CDD or antenna delay or cyclic precoding, the implementation manner indicated by using the precoding indication information of the uplink signal.

Optionally, when the terminal performs CDD or antenna delay or cyclic precoding transmission, it may perform small-delay CDD or small-delay transmission only between coherent transmission antenna groups, and antennas in the same coherent transmission antenna group use the same delay.

For each of the above schemes, optionally, the UE transmits using CDD or antenna delay or cyclic precoding when transmitting the SRS, that is, applying CDD or antenna delay or cyclic precoding on different SRS ports.

For each of the above schemes, when the base station does not instruct the uplink transmission using the CDD, the antenna delay, or the cyclic precoding, the terminal may not apply the CDD, the antenna delay, or the cyclic precoding to perform the uplink signal transmission.

To further aid in understanding the above scheme, the codewords referred to herein are described in more detail below:

in the embodiment of the present invention, the codewords in the uplink codebook are divided into at least the following three coherent types (or referred to as coherent transmission types), which are: fully coherent, partially coherent, and non-coherent codewords (which may also be referred to as fully coherent transmitted codewords, partially coherent transmitted codewords, and non-coherent transmitted codewords).

Wherein, any column in the partially coherent transmitted codeword only corresponds to non-zero elements belonging to the same coherent transmission antenna group (for example, in a 3GPP NR system, the 1 st and 3rd antennas are one coherent transmission antenna group, and the 2 nd and 4 th antennas are another coherent transmission antenna group).

Any column in the non-coherent transmission codeword has only non-zero elements corresponding to one antenna.

All elements of at least one column of the full-coherent transmission codeword are non-zero.

For ease of understanding, the following table lists one possible uplink codebook in the 3GPP NR system and gives specific codeword types.

For example, Table Table 6.3.1.5-1 of 3GPP protocol TS38.211 shown in the following Table takes a Precoding matrix W for single-layer transmission using two anti-enna ports as an example, wherein, a code word with TPMI index of 0-1 is a non-coherent transmission code word; the other codewords are codewords of the full coherent transmission.

TABLE 5

For example, the 3GPP protocol TS38.211Table 6.3.1.5-2 shown in the following table takes a Precoding matrix W for single-layer transmission using a source antenna port with a transform Precoding enabled as an example, wherein TPMI index is a codeword of 0-3 for noncoherent transmission; the code word with TPMI index of 4-11 is a code word of partial coherent transmission; the other codewords are codewords of the full coherent transmission.

TABLE 6

Based on the method, the embodiment of the invention also provides equipment for implementing the method.

Referring to fig. 8, a schematic structural diagram of a terminal according to an embodiment of the present invention is shown, where the terminal 80 includes: a processor 801, a transceiver 802, a memory 803, a user interface 804, and a bus interface, wherein:

in this embodiment of the present invention, the terminal 800 further includes: computer programs stored on the memory 803 and executable on the processor 801.

The transceiver 802 is configured to receive first indication information sent by a base station, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

For the specific implementation of the first transmission mode, reference may be made to the corresponding description of the method embodiment, and details are not described herein for brevity.

Preferably, the processor 801 is configured to read a program in the memory, and execute the following processes: if the first indication information indicates that the terminal transmits the uplink signal by adopting the first transmission mode, when a first preset condition is met, the terminal performs uplink transmission by adopting the first transmission mode, wherein the first preset condition comprises that: receiving a first precoding code word with the transmission stream number X indicated by a base station, wherein X is a positive integer.

In FIG. 8, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 801, and various circuits, represented by the memory 803, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 802 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 804 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 801 is responsible for managing the bus architecture and general processing, and the memory 803 may store data used by the processor 801 in performing operations.

Preferably, the number X of transmission streams of the first precoding code word is 1.

Preferably, under the restriction of the codebook corresponding to the uplink signal or the codebook subset corresponding to the uplink signal, the precoding indication information includes one of the first states when corresponding to the number X of transmission streams, where X is a positive integer.

Preferably, the terminal performs uplink transmission in the first transmission mode when a second predetermined condition is satisfied, where the second predetermined condition includes: the received state of the precoding indication information of the uplink signal is the first state.

alternatively, the first and second liquid crystal display panels may be,

Preferably, the first indication information includes:

Preferably, when the coherent transmission capability of the terminal is non-coherent transmission, the second precoding codeword is a codeword of partial coherent transmission or full coherent transmission; and when the coherence transmission capability of the terminal is partial coherence transmission, the second precoding codeword is a codeword of full coherence transmission.

Preferably, before the step of receiving the first indication information sent by the base station, the transceiver is further configured to report, to the base station, third indication information whether the terminal has the uplink transmission capability of the first transmission mode.

Preferably, after receiving the first indication information, the transceiver is further configured to perform uplink transmission in the first transmission mode if the first indication information is used to indicate the terminal to transmit an uplink signal in the first transmission mode.

Preferably, the transceiver is further configured to use an antenna corresponding to a non-zero antenna port in the precoding code word to perform uplink transmission in the first transmission mode when the first indication information is used to indicate the terminal to transmit the uplink signal in the first transmission mode and the precoding code word containing the number of non-zero antenna ports greater than 1 is used to perform the uplink signal transmission.

Preferably, the transceiver is further configured to perform, when performing uplink transmission by using the first transmission method, small-delay CCD or small-delay antenna transmission only between coherent transmission antenna groups, where antennas in the same coherent transmission antenna group use the same delay.

Preferably, the transceiver is further configured to adopt different schemes of a first transmission mode when the noncoherent precoding code word is used for the transmission of the uplink signal and the terminal uses the partially coherent precoding code word for the transmission of the uplink signal; and/or adopting different schemes of the first transmission mode when the uplink signal is transmitted by using the fully coherent precoding code words and the uplink signal is transmitted by using the partially coherent precoding code words by the terminal.

Preferably, the transceiver is further configured to receive precoding indication information of the uplink signal indicated by the base station for the terminal; the processor is further configured to determine precoding of an uplink signal corresponding to the precoding indication information according to whether the uplink transmission capability of the first transmission mode is indicated by the third indication information.

Referring to fig. 9, an embodiment of the present invention provides another terminal 90, including:

a receiving unit 91, configured to receive first indication information sent by a base station, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

Referring to fig. 10, an embodiment of the present invention provides a structural schematic diagram of a base station 1000, including: a processor 1001, a transceiver 1002, a memory 1003, and a bus interface, wherein:

in this embodiment of the present invention, the base station 1000 further includes: computer programs stored in the memory 1003 and executable on the processor 1001.

The transceiver 1002 is configured to send first indication information to a terminal, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

Preferably, the processor 1001 is configured to read a program in a memory, and execute the following processes: before the first indication information is sent, calculating uplink scheduling information of an uplink signal based on an assumption that the terminal performs transmission of the uplink signal in the first transmission mode under a predetermined condition, where the predetermined condition includes that the first indication information indicates that the terminal transmits the uplink signal in the first transmission mode.

In fig. 10, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1001 and various circuits of memory represented by memory 1003 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1002 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 1001 is responsible for managing a bus architecture and general processes, and the memory 1003 may store data used by the processor 1001 in performing operations.

Preferably, the transceiver is further configured to receive the uplink signal in a manner corresponding to the first transmission manner after the first indication information is sent.

Preferably, X is 1.

wherein the first condition is:

the second condition is that:

the terminal has non-coherent transmission capability; or

The terminal has a partially coherent transmission capability.

Preferably, the first indication information includes:

Preferably, a coherence property of the second precoding codeword exceeds a coherence transmission capability of the terminal.

Preferably, before the step of sending the first indication information, the transceiver is further configured to receive third indication information, which is reported by a terminal, whether the terminal has uplink transmission capability of the first transmission mode; and when the terminal supports the first transmission mode, sending first indication information to the terminal.

Referring to fig. 11, an embodiment of the present invention provides another structure of a base station 110, as shown in fig. 11, the base station 110 includes:

a sending unit 111, configured to send first indication information to a terminal, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on CCD or antenna delay or cyclic precoding.

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

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

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

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

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

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

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

Claims

1. An uplink transmission method applied to a terminal is characterized by comprising the following steps:

receiving first indication information sent by a base station, wherein the first indication information is used for indicating whether the terminal adopts a first transmission mode to transmit an uplink signal, and the first transmission mode is an uplink transmission mode based on Cyclic Delay Diversity (CDD), antenna delay or cyclic precoding;

the first indication information includes:

the base station indicates codebook subset restriction information of the uplink signal for the terminal, and when the codebook subset restriction information corresponds to a predetermined second codebook subset, the codebook subset restriction information indicates the terminal to transmit the uplink signal by using the first transmission mode; or

The first indication information includes:

2. The method of claim 1, wherein after receiving the first indication information, the method further comprises:

3. The method of claim 1,

the first indication information is precoding indication information of the uplink signal, wherein when the state of the precoding indication information is a first state, the precoding indication information indicates the terminal to transmit the uplink signal by adopting the first transmission mode.

4. The method of claim 3, further comprising:

and when a second preset condition is met, the terminal adopts the first transmission mode to carry out uplink transmission, wherein the second preset condition comprises that: the received precoding indication information of the uplink signal is in the first state.

5. The method according to claim 2or 4,

the first predetermined condition or the second predetermined condition further includes: the base station indicates a non-coherent codebook subset for the codebook subset restriction information indicated by the terminal;

alternatively, the first and second liquid crystal display panels may be,

6. The method of claim 1,

the first indication information is further configured to indicate a precoding codeword of the uplink signal, where when a coherence attribute of the precoding codeword exceeds coherence transmission capability of the terminal, the first indication information indicates that the terminal transmits the uplink signal in the first transmission mode.

7. The method of claim 6,

the precoding code word is a code word in a first codebook subset indicated by the base station for the terminal, the first codebook subset includes at least one first type code word and at least one second type code word corresponding to the number X of transmission streams, the coherence attribute of the first type code word does not exceed the coherence transmission capability of the terminal, the coherence attribute of the second type code word exceeds the coherence transmission capability of the terminal, and X is a positive integer; when the precoding code word belongs to the second class code word, the first indication information indicates that the terminal transmits an uplink signal by adopting the first transmission mode.

8. The method of claim 1, further comprising:

the third codebook subset is a codebook subset that can only be indicated to the first class terminals, and the first class terminals are terminals with uplink transmission capability of the first transmission mode.

9. The method of claim 1, wherein the coherence property of the second precoded codeword exceeds the coherence transmission capability of the terminal.

10. The method of claim 9,

the third codebook subset comprises at least one third type codeword and at least one fourth type codeword corresponding to the number X of transmission streams, the coherence attribute of the third type codeword does not exceed the coherence transmission capability of the terminal, the coherence attribute of the fourth type codeword exceeds the coherence transmission capability of the terminal, the second precoding codeword belongs to the fourth type codeword, and X is a positive integer.

11. The method according to any one of claims 1 to 4 and 6 to 10, wherein before the step of receiving the first indication information transmitted by the base station, the method further comprises:

12. The method according to any one of claims 3, 6 to 10, wherein after receiving the first indication information, the method further comprises:

13. The method according to any one of claims 3, 6 to 10, wherein after receiving the first indication information, the method further comprises:

14. The method according to any one of claims 2 and 4,

when the terminal adopts the first transmission mode to perform uplink transmission, only small-delay CDD or small-delay antenna transmission is performed between the coherent transmission antenna groups, and the antennas in the same coherent transmission antenna group use the same time delay.

15. The method according to claim 2or 4, wherein the performing uplink transmission by using the first transmission mode includes:

16. The method of claim 11, further comprising:

17. The method of any one of claims 1-4, 6-10, and 16, wherein the first indication information is indicated by at least one of RRC signaling, MAC-CE signaling, and DCI.

18. An uplink transmission method applied to a base station includes:

a base station sends first indication information to a terminal, wherein the first indication information is used for indicating whether the terminal adopts a first transmission mode to transmit an uplink signal, and the first transmission mode is an uplink transmission mode based on Cyclic Delay Diversity (CDD) or antenna delay or cyclic precoding;

the first indication information includes:

The first indication information includes:

19. The method of claim 18, wherein before sending the first indication information, the method further comprises:

20. The method according to claim 18 or 19, wherein after sending the first indication information, the method further comprises:

21. The method of claim 19,

the predetermined conditions further include: a first precoding codeword with a number X of transmission streams is indicated to the terminal.

22. The method of claim 18 or 19,

23. The method of claim 19 or 21, wherein the predetermined condition further comprises at least one of a first condition and a second condition;

wherein the first condition is:

the base station indicates a non-coherent codebook subset or a partial coherent codebook subset for the codebook subset restriction information indicated by the terminal;

the second condition is that:

the terminal has non-coherent transmission capability; or

The terminal has a partially coherent transmission capability.

24. The method of claim 18 or 19,

25. The method of claim 24,

the precoding code word is a code word in a first codebook subset indicated by the base station for the terminal, the first codebook subset includes at least one first type code word and at least one second type code word corresponding to the number X of transmission streams, the coherence attribute of the first type code word does not exceed the coherence transmission capability of the terminal, the coherence attribute of the second type code word exceeds the coherence transmission capability of the terminal, and X is a positive integer; and when the precoding code word belongs to the second class of code words, the first indication information indicates the terminal to transmit the uplink signal by adopting the first transmission mode.

26. The method of claim 18,

27. The method of claim 18, wherein the coherence property of the second precoded codeword exceeds the coherence transmission capability of the terminal.

28. The method of claim 27,

29. The method according to any of claims 18-19, 21, 25-28, wherein prior to the step of sending the first indication information, the method further comprises:

30. The method of claim 29, further comprising:

31. The method of any of claims 18-19, 21, 25-28, wherein the first indication information is indicated by at least one of RRC signaling, MAC-CE signaling, and DCI.

32. A terminal, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor;

the transceiver is configured to receive first indication information sent by a base station, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on cyclic delay diversity CDD, antenna delay, or cyclic precoding;

the first indication information includes:

The first indication information includes:

33. The terminal of claim 32,

the processor is used for reading the program in the memory and executing the following processes: if the first indication information indicates that the terminal transmits the uplink signal by adopting the first transmission mode, when a first preset condition is met, the terminal performs uplink transmission by adopting the first transmission mode, wherein the first preset condition comprises that: receiving a first precoding code word with the transmission stream number X indicated by a base station, wherein X is a positive integer.

34. The terminal of claim 32,

35. The terminal of claim 34,

the transceiver is further configured to perform uplink transmission in the first transmission manner when a second predetermined condition is met, where the second predetermined condition includes: the received precoding indication information of the uplink signal is in the first state.

36. The terminal according to claim 33 or 35,

alternatively, the first and second electrodes may be,

37. The terminal of claim 32,

38. The terminal of claim 37,

39. The terminal of claim 32,

40. The terminal of claim 32, wherein the coherence property of the second precoded codeword exceeds the coherence transmission capability of the terminal.

41. The terminal of claim 40,

42. The terminal of any one of claims 32 to 35, 37 to 41,

the transceiver is further configured to report, to the base station, third indication information indicating whether the terminal has the uplink transmission capability of the first transmission mode before receiving the first indication information sent by the base station.

43. A terminal as claimed in any one of claims 34, 37 to 41,

the transceiver is further configured to perform uplink transmission in the first transmission mode after receiving the first indication information, if the first indication information is used to indicate the terminal to transmit an uplink signal in the first transmission mode.

44. A terminal as claimed in any one of claims 34, 37 to 41,

the transceiver is further configured to, after receiving the first indication information, use an antenna corresponding to a non-zero antenna port in a precoding codeword to perform uplink transmission in the first transmission mode when the first indication information is used to indicate that the terminal transmits an uplink signal in the first transmission mode and the terminal performs uplink signal transmission using the precoding codeword that includes the non-zero antenna port whose number is greater than 1.

45. The terminal according to claim 33 or 35,

the transceiver is further configured to perform CDD or small delay antenna transmission only between coherent transmission antenna groups when the terminal performs uplink transmission in the first transmission mode, where antennas in the same coherent transmission antenna group use the same delay.

46. The terminal according to claim 33 or 35,

the transceiver is further configured to adopt different schemes of a first transmission mode when the terminal uses a non-coherent precoding codeword to perform the transmission of the uplink signal and when the terminal uses a partially coherent precoding codeword to perform the transmission of the uplink signal; and/or adopting different schemes of the first transmission mode when the terminal uses the fully coherent precoding code words to transmit the uplink signals and the terminal uses the partially coherent precoding code words to transmit the uplink signals.

47. The terminal of claim 42,

the transceiver is further configured to receive precoding indication information of the uplink signal indicated by the base station for the terminal;

the processor is further configured to determine precoding of an uplink signal corresponding to the precoding indication information according to whether the uplink transmission capability of the first transmission mode is indicated by the third indication information.

48. The terminal according to any of claims 32-35, 37-41, 47, wherein the first indication information is indicated by at least one of RRC signaling, MAC-CE signaling and DCI.

49. A terminal, comprising:

a receiving unit, configured to receive first indication information sent by a base station, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on cyclic delay diversity CDD, antenna delay, or cyclic precoding;

the first indication information includes:

The first indication information includes:

50. A base station, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor;

the transceiver is configured to send first indication information to a terminal, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on cyclic delay diversity CDD, antenna delay, or cyclic precoding;

the first indication information includes:

The first indication information includes:

51. The base station of claim 50,

the processor is used for reading the program in the memory and executing the following processes: before the first indication information is sent, calculating uplink scheduling information of an uplink signal based on an assumption that the terminal performs transmission of the uplink signal in the first transmission mode under a predetermined condition, where the predetermined condition includes that the first indication information indicates that the terminal transmits the uplink signal in the first transmission mode.

52. The base station according to claim 50 or 51, wherein after transmitting the first indication information, the base station further comprises:

and receiving the uplink signal by adopting a mode corresponding to the first transmission mode.

53. The base station of claim 51,

the predetermined conditions further include: a first precoding codeword with a transmission stream number X is indicated to the terminal.

54. The base station according to claim 50 or 51,

55. The base station of claim 51 or 53, wherein the predetermined condition further comprises at least one of a first condition and a second condition;

wherein the first condition is:

the second condition is:

the terminal has non-coherent transmission capability; or

The terminal has a partially coherent transmission capability.

56. The base station according to claim 50 or 51,

57. The base station of claim 56,

58. The base station of claim 50,

59. The base station of claim 50, wherein the coherence property of the second precoded codeword exceeds the coherence transmission capability of the terminal.

60. The base station of claim 59,

61. The base station according to any of claims 50-51, 53, 57-60,

the transceiver is further configured to receive, before sending the first indication information, third indication information that is reported by a terminal whether the terminal has uplink transmission capability of the first transmission mode; and when the terminal supports the first transmission mode, sending first indication information to the terminal.

62. The base station of claim 61,

the transceiver is further configured to indicate precoding indication information of the uplink signal to a terminal; the precoding of the uplink signal indicated by the precoding indication information of the same value is different according to whether the uplink transmission capability of the first transmission mode is indicated by the third indication information.

63. The base station according to any of claims 50-51, 53, 57-60, wherein the first indication information is indicated by at least one of RRC signaling, MAC-CE signaling and DCI.

64. A base station, comprising:

a sending unit, configured to send first indication information to a terminal, where the first indication information is used to indicate whether the terminal transmits an uplink signal in a first transmission mode, where the first transmission mode is an uplink transmission mode based on cyclic delay diversity CDD, antenna delay, or cyclic precoding;

the first indication information includes:

The first indication information includes:

65. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method for upstream transmission according to any one of claims 1 to 31.