阅读说明：本技术 一种信号传输方法及装置 (Signal transmission method and device ) 是由 黄伟 杜振国 金乐 于 2019-03-12 设计创作，主要内容包括：本申请提供一种信号传输方法及装置,其中方法包括：终端设备确定采用分集传输技术发送上行信号时,在所述终端设备未接收到来自网络设备的第一参考信号的情况下,所述终端设备获取第一参数以及第一循环时延；所述第一参数为所述终端设备当前的第一移动速度,或者所述终端设备当前使用的第一资源块RB数量；所述第一循环时延为所述终端设备确定采用分集传输技术发送上行信号之前,根据来自所述网络设备的第二参考信号确定的；所述终端设备根据所述第一参数以及所述第一循环时延确定第二循环时延；所述终端设备根据所述第二循环时延采用分集传输技术发送所述上行信号。(The application provides a signal transmission method and a signal transmission device, wherein the method comprises the following steps: when terminal equipment determines to adopt a diversity transmission technology to transmit an uplink signal, the terminal equipment acquires a first parameter and a first cyclic delay under the condition that the terminal equipment does not receive a first reference signal from network equipment; the first parameter is a current first moving speed of the terminal equipment or a current first resource block RB quantity used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment determines to adopt a diversity transmission technology to send an uplink signal; the terminal equipment determines a second cyclic delay according to the first parameter and the first cyclic delay; and the terminal equipment transmits the uplink signal by adopting a diversity transmission technology according to the second cyclic delay.)

1. A signal transmission method, comprising:

when terminal equipment transmits an uplink signal by adopting a diversity transmission technology, under the condition that the terminal equipment does not receive a first reference signal from network equipment, the terminal equipment acquires a first parameter and a first cyclic delay; the first parameter is a current first moving speed of the terminal equipment or a current first resource block RB quantity used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal;

the terminal equipment determines a second cyclic delay according to the first parameter and the first cyclic delay;

and the terminal equipment transmits the uplink signal by adopting a diversity transmission technology according to the second cyclic delay.

2. The method of claim 1, further comprising:

under the condition that the terminal equipment receives the first reference signal, the terminal equipment determines a signal phase difference on a receiving antenna of the terminal equipment according to the first reference signal;

the terminal equipment determines the second cyclic delay according to the signal phase difference;

and the terminal equipment transmits the uplink signal by adopting a diversity transmission technology according to the second cyclic delay.

3. The method according to claim 1 or 2, wherein when the first parameter is a first moving speed of the terminal device, the terminal device determines a second cyclic delay according to the first parameter and the first cyclic delay, and the method comprises:

the terminal equipment determines a first ratio of the first parameter to a second moving speed; the second moving speed is the moving speed of the terminal equipment at a first moment, and the first moment is the moment when the terminal equipment receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal;

and the terminal equipment determines the second cyclic delay according to the product of the first ratio and the first cyclic delay.

4. The method according to claim 1 or 2, wherein when the first parameter is a first moving speed of the terminal device, the terminal device determines a second cyclic delay according to the first parameter and the first cyclic delay, and the method comprises:

the terminal equipment determines the cyclic delay mapped with the first moving speed and the first cyclic delay in a preset mapping table as the second cyclic delay according to the first moving speed; the preset mapping table comprises a mapping relation between the moving speed and the cyclic delay.

5. The method according to claim 1 or 2, wherein when the first parameter is a first number of RBs currently used by the terminal device, the determining, by the terminal device, a second cyclic delay according to the first parameter and the first cyclic delay comprises:

the terminal equipment determines a second ratio of the first parameter to a second RB quantity; the second number of RBs is a number of RBs used by the terminal device at a first time, and the first time is a time when the terminal device receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal;

and the terminal equipment determines the second cyclic delay according to the product of the second ratio and the first cyclic delay.

6. The method according to any of claims 1 to 5, wherein the first reference signal is a synchronization signal block SSB or a channel state information reference signal CSI-RS or a data demodulation reference signal DM-RS.

7. The method according to any of claims 1 to 5, wherein the diversity transmission technique is cyclic delay diversity CDD or space phase diversity SPD.

8. A signal transmission method, comprising:

the network equipment receives an uplink signal from the terminal equipment; under the condition that the terminal equipment does not receive a first reference signal from the network equipment, the uplink signal is sent by the terminal equipment by adopting a diversity transmission technology according to a second cyclic delay, the second cyclic delay is determined according to a first parameter and a first cyclic delay, and the first parameter is the current first moving speed of the terminal equipment or the current number of first Resource Blocks (RB) used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal;

the network device demodulates the uplink signal.

9. The method of claim 8, further comprising:

and under the condition that the terminal equipment receives the first reference signal, determining the second cyclic delay according to a signal phase difference on a receiving antenna of the terminal equipment, wherein the signal phase difference is determined according to the first reference signal.

10. A terminal device, comprising:

the processing unit is used for acquiring a first parameter and a first cyclic delay when the diversity transmission technology is adopted to transmit an uplink signal and under the condition that a first reference signal from network equipment is not received; the first parameter is a current first moving speed of the terminal equipment or a current first resource block RB quantity used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal; determining a second cyclic delay according to the first parameter and the first cyclic delay;

and the transceiving unit is used for transmitting the uplink signal by adopting a diversity transmission technology according to the second cyclic delay.

11. The terminal device of claim 10, wherein the processing unit is further configured to:

under the condition that the first reference signal is received, determining a signal phase difference on a receiving antenna of the terminal equipment according to the first reference signal; determining the second cyclic delay according to the signal phase difference;

the transceiver unit is further configured to transmit the uplink signal by using a diversity transmission technology according to the second cyclic delay.

12. The terminal device according to claim 10 or 11, wherein when the first parameter is a first moving speed of the terminal device, the processing unit is specifically configured to:

determining a first ratio of the first parameter to a second movement speed; the second moving speed is the moving speed of the terminal equipment at a first moment, and the first moment is the moment when the terminal equipment receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal;

and determining the second cyclic delay according to the product of the first ratio and the first cyclic delay.

13. The terminal device according to claim 10 or 11, wherein when the first parameter is a first moving speed of the terminal device, the processing unit is specifically configured to:

determining the cyclic delay mapped with the first moving speed and the first cyclic delay in a preset mapping table as the second cyclic delay according to the first moving speed; the preset mapping table comprises a mapping relation between the moving speed and the cyclic delay.

14. The terminal device according to claim 10 or 11, wherein when the first parameter is a first number of RBs currently used by the terminal device, the processing unit is specifically configured to:

determining a second ratio of the first parameter to a second number of RBs; the second number of RBs is a number of RBs used by the terminal device at a first time, and the first time is a time when the terminal device receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal;

and determining the second cyclic delay according to the product of the second ratio and the first cyclic delay.

15. The terminal device according to any of claims 10 to 14, wherein the first reference signal is a synchronization signal block SSB or a channel state information reference signal CSI-RS or a data demodulation reference signal DM-RS.

16. A terminal device according to any of claims 10 to 14, characterized in that the diversity transmission technique is cyclic delay diversity, CDD, or space phase diversity, SPD.

17. A network device, comprising:

a receiving and transmitting unit, configured to receive an uplink signal from a terminal device; under the condition that the terminal equipment does not receive a first reference signal from the network equipment, the uplink signal is sent by the terminal equipment by adopting a diversity transmission technology according to a second cyclic delay, the second cyclic delay is determined according to a first parameter and a first cyclic delay, and the first parameter is the current first moving speed of the terminal equipment or the current number of first Resource Blocks (RB) used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal;

and the processing unit is used for demodulating the uplink signal.

18. The network device of claim 17, wherein in a case where the terminal device receives the first reference signal, the second cyclic delay is determined according to a signal phase difference on a receiving antenna of the terminal device, and the signal phase difference is determined according to the first reference signal.

19. A terminal device, characterized in that the terminal device comprises:

a processor, a memory, and a transceiver;

the transceiver is used for receiving and transmitting data;

the memory is to store instructions;

the processor is configured to execute the instructions in the memory to perform the method of any of claims 1-7.

20. A network device, characterized in that the network device comprises:

a processor, a memory, and a transceiver;

the transceiver is used for receiving and transmitting data;

the memory is to store instructions;

the processor is configured to execute the instructions in the memory to perform the method of any of claims 8-9.

21. A readable storage medium, comprising a program or instructions which, when executed, perform the method of any of claims 1 to 9.

22. A computer program product comprising computer readable instructions which, when read and executed by a communication device, cause the communication device to perform the method of any one of claims 1 to 9.

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a signal transmission method and apparatus.

Background

For most existing cellular communications, the coverage area inevitably has a weak coverage area. The term "weak coverage" refers to a coverage condition in which the signal strength cannot guarantee that the network can meet the requirement of stable communication. Weak signal coverage is easy to occur under the conditions of blocking by obstacles at the edge of a cell and outdoors, deep indoor coverage and the like. In the downlink signal weak coverage area, the downlink signal weak coverage area is also the uplink signal weak coverage area of the terminal device. Further, due to the limited power consumption of the terminal device, the terminal device cannot continuously transmit signals with larger power or with higher retransmission times as the base station, and even the uplink signal coverage area is smaller than the downlink signal coverage area. As a result, when the quality of the downlink signal of the serving cell received by the terminal device is within the acceptable range, the quality of the uplink signal of the terminal device has been attenuated to be below the threshold that can be correctly demodulated, which results in failure of the base station to receive the uplink signal, and this situation affects the performance of handover on one hand and the ongoing uplink transmission of the terminal device on the other hand.

In a 5G New Radio (NR) network, high-frequency signals are attenuated more quickly than low-frequency signals, so that the coverage area of the high-frequency signals is reduced no matter in downlink or uplink, the probability that the terminal device is in a signal weak coverage area is increased, and the method is particularly obvious in the initial stage of NR network establishment. Signal attenuation is fast, and cell switching is frequent, so that the terminal equipment faces the challenge of link quality degradation when moving across cells in an NR network.

In order to improve the coverage problem caused by the imbalance of the High-frequency uplink and downlink, the 3rd generation partnership project (3 GPP) defines several frequency bands to support High Power (High Power) terminal devices, so as to support a larger uplink coverage area and save a large amount of network deployment cost. Currently, in order to support high power output of a high power terminal device, the terminal device may transmit signals using two-antenna or multiple transmit diversity, so as to achieve the power required by the high power terminal device. Since the 3GPP NR protocol does not specify the uplink diversity mode, the base station cannot accurately demodulate the signal transmitted by the terminal device without knowing whether the terminal device uses the diversity mode, the transmit diversity mode, and the transmit diversity parameter, so that it is currently necessary to design an uplink diversity mode transparent to the base station, that is, it is not necessary to know whether the terminal device uses the diversity mode, the transmit diversity mode, and the transmit diversity parameter, and it is therefore necessary to ensure the uplink diversity gain of the terminal device.

In the existing scheme for realizing transparent transmit diversity transmission, the transmission is realized based on the reciprocity of an uplink channel and a downlink channel. When there is reciprocity between the uplink and downlink channels, the terminal device may use a Cyclic Delay Diversity (CDD) technique to implement transparent transmit diversity transmission. In the CDD technology, a terminal device performs forward error correction coding, interleaving, scrambling, signal modulation, and Inverse Fourier transform (IFFT) processing on a signal to be transmitted, and then obtains an Orthogonal Frequency Division Multiplexing (OFDM) symbol. The terminal equipment copies the same OFDM symbol to M_TEach branch signal needs to be subjected to Cyclic delay, and finally each branch signal is added with a Cyclic Prefix (CP) and then is sent out through an antenna, wherein M_TIs the number of antennas. For example, the signal on the branch corresponding to the nth antenna requires a cyclic delay_n,n＝0,1,2,…,M_T-1, n is the antenna number. The terminal equipment sends signals by adopting the CDD technology, and the base station side can correctly demodulate the signals sent by the terminal equipment only by a traditional mode without knowing whether the terminal equipment uses a diversity mode, a transmission diversity mode and transmission diversity parameters.

Currently, the cyclic delay of the signal to be transmitted by each antenna is determined in real time by the terminal device by measuring the downlink reference signal transmitted by the base station. However, if the terminal device cannot receive the reference signal, for example, the period of the reference signal is too large, and the terminal device does not receive the reference signal when the terminal device needs to transmit the signal, the terminal device cannot determine the cyclic delay needed for transmitting the signal in real time, so as to reduce the diversity gain.

Disclosure of Invention

Embodiments of the present application provide a signal transmission method and apparatus, so as to solve a problem how to improve diversity gain of transparent transmit diversity transmission.

In a first aspect, an embodiment of the present application provides a signal transmission method, including: when terminal equipment transmits an uplink signal by adopting a diversity transmission technology, under the condition that the terminal equipment does not receive a first reference signal from network equipment, the terminal equipment acquires a first parameter and a first cyclic delay; the first parameter is a current first moving speed of the terminal equipment or a current first resource block RB quantity used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal; the terminal equipment determines a second cyclic delay according to the first parameter and the first cyclic delay; and the terminal equipment transmits the uplink signal by adopting a diversity transmission technology according to the second cyclic delay.

By the method, when the terminal equipment does not receive the reference signal, the terminal equipment can adjust the first cyclic delay according to the first moving speed or the first RB to obtain the second cyclic delay, so that the cyclic delay required by signal sending is determined in real time, the accuracy of the cyclic delay is improved, and the diversity gain is improved.

In an optional embodiment, the method further comprises: under the condition that the terminal equipment receives the first reference signal, the terminal equipment determines a signal phase difference on a receiving antenna of the terminal equipment according to the first reference signal; the terminal equipment determines the second cyclic delay according to the signal phase difference; and the terminal equipment transmits the uplink signal by adopting a diversity transmission technology according to the second cyclic delay.

In an optional implementation manner, when the first parameter is a first moving speed of the terminal device, the determining, by the terminal device, a second cyclic delay according to the first parameter and the first cyclic delay by the terminal device includes: the terminal equipment determines a first ratio of the first parameter to a second moving speed; the second moving speed is the moving speed of the terminal equipment at a first moment, and the first moment is the moment when the terminal equipment receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal; and the terminal equipment determines the second cyclic delay according to the product of the first ratio and the first cyclic delay.

By the method, the mobile speed of the terminal equipment influences the fading state of the signal, so that the second cyclic delay can be determined according to the first ratio of the first mobile speed to the second mobile speed of the terminal equipment, the cyclic delay required by the signal transmission can be accurately determined, the accuracy of the cyclic delay is improved, and the diversity gain is improved.

In an optional implementation manner, when the first parameter is a first moving speed of the terminal device, the determining, by the terminal device, a second cyclic delay according to the first parameter and the first cyclic delay by the terminal device includes: the terminal equipment determines the cyclic delay mapped with the first moving speed and the first cyclic delay in a preset mapping table as the second cyclic delay according to the first moving speed; the preset mapping table comprises a mapping relation between the moving speed and the cyclic delay.

By the method, the second cyclic delay mapped with the first moving speed and the first cyclic delay can be quickly determined by presetting the mapping table, so that the cyclic delay required by the transmitted signal can be accurately determined, the accuracy of the cyclic delay is improved, and the diversity gain is improved.

In an optional implementation manner, when the first parameter is a first number of RBs currently used by the terminal device, the determining, by the terminal device, a second cyclic delay according to the first parameter and the first cyclic delay includes: the terminal equipment determines a second ratio of the first parameter to a second RB quantity; the second number of RBs is a number of RBs used by the terminal device at a first time, and the first time is a time when the terminal device receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal; and the terminal equipment determines the second cyclic delay according to the product of the second ratio and the first cyclic delay.

By the method, the number of RBs used by the terminal equipment influences the frequency diversity gain of the signal, so that the second cyclic delay can be determined according to the second ratio of the first number of RBs to the second number of RBs of the terminal equipment, the cyclic delay required by the signal transmission can be accurately determined, the accuracy of the cyclic delay is improved, and the diversity gain is improved.

In an optional implementation manner, the first reference signal is a synchronization signal block SSB or a channel state information reference signal CSI-RS or a data demodulation reference signal DM-RS.

In an optional implementation, the diversity transmission technique is cyclic delay diversity CDD or space-phase diversity SPD.

In a second aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a memory, a transceiver, and a processor, where: the memory is used for storing instructions; the processor is configured to execute the instructions stored by the memory and to control the transceiver to perform signal reception and signal transmission, and when the processor executes the instructions stored by the memory, is configured to perform the method of any one of the possible designs of the first or second aspect.

In a third aspect, an embodiment of the present application provides a terminal device, configured to implement the first aspect, or the third aspect, or any one of the methods in the first aspect, where the terminal device includes corresponding functional modules, for example, includes a processing unit, a transceiver unit, and the like, and are respectively configured to implement the steps in the above methods.

In a fourth aspect, an embodiment of the present application provides a signal transmission method, including: the network equipment receives an uplink signal from the terminal equipment; under the condition that the terminal equipment does not receive a first reference signal from the network equipment, the uplink signal is sent by the terminal equipment by adopting a diversity transmission technology according to a second cyclic delay, the second cyclic delay is determined according to a first parameter and a first cyclic delay, and the first parameter is the current first moving speed of the terminal equipment or the current number of first Resource Blocks (RB) used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal; the network device demodulates the uplink signal.

By the method, when the terminal equipment does not receive the reference signal, the terminal equipment can adjust the first cyclic delay according to the first moving speed or the first RB to obtain the second cyclic delay, so that the cyclic delay required by signal sending is determined in real time, the accuracy of the cyclic delay is improved, and the diversity gain is improved.

In an optional embodiment, the method further comprises: and under the condition that the terminal equipment receives the first reference signal, determining the second cyclic delay according to a signal phase difference on a receiving antenna of the terminal equipment, wherein the signal phase difference is determined according to the first reference signal.

In a fifth aspect, an embodiment of the present application provides a network device, where the network device includes a memory, a radio frequency unit, and a processor, where: the memory is used for storing instructions; the processor is configured to execute the instructions stored in the memory and control the rf unit to perform signal receiving and signal transmitting, and when the processor executes the instructions stored in the memory, is configured to perform the method of any one of the possible designs of the fourth or fourth aspect.

In a sixth aspect, an embodiment of the present application provides a network device, configured to implement the fourth aspect or any one of the methods in the fourth aspect, where the network device includes corresponding functional modules, for example, a processing unit, a transceiver unit, and the like, that are respectively configured to implement the steps in the above methods.

Embodiments of the present application provide a readable storage medium, which stores computer readable instructions, and when the computer readable instructions are read and executed by a computer, the computer is enabled to execute the method in any one of the above possible designs.

The embodiments of the present application provide a computer program product, which when read and executed by a computer, causes the computer to perform the method of any one of the above possible designs.

The embodiment of the present application provides a chip, where the chip is connected to a memory, and is used to read and execute a software program stored in the memory, so as to implement the method in any one of the above possible designs.

An embodiment of the present application provides a communication system, including the terminal device and the network device in any of the above aspects.

Drawings

Fig. 1 shows a schematic diagram of a communication system suitable for use in the method provided by the embodiments of the present application;

FIG. 2 is a schematic diagram of the basic principle of a time domain implementation of CDD in the prior art;

FIG. 3 is a schematic diagram of the basic principle of a frequency domain implementation of CDD in the prior art;

fig. 4 is a schematic diagram of a signal transmission process according to an embodiment of the present application;

fig. 5 is a schematic diagram of signal transmission according to an embodiment of the present application;

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

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

fig. 8 is a schematic diagram of a terminal network structure according to an embodiment of the present application.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the drawings attached hereto.

The embodiment of the application can be applied to various mobile communication systems, such as: other communication systems, such as a New Radio (NR) system, a Long Term Evolution (LTE) system, an advanced long term evolution (LTE-a) system, an evolved Long Term Evolution (LTE) system, and a future communication system, are not limited herein.

For the convenience of understanding the embodiments of the present application, a communication system applicable to the embodiments of the present application will be first described in detail by taking the communication system shown in fig. 1 as an example. Fig. 1 shows a schematic diagram of a communication system suitable for the method provided by the embodiment of the present application. As shown in fig. 1, the communication system includes a network device and a terminal device. The signal coverage area of the network device may be as shown by a circle in fig. 1, and when the terminal device is located at an edge of the signal coverage area of the network device, the terminal device may be considered to be located in a weak coverage area, and at this time, in order to improve robustness of signal transmission, the terminal device may perform uplink transmission by using CDD. Certainly, in other scenarios, the terminal device may also perform uplink transmission by using CDD, for example, 1, a fast fading channel, where it is difficult for the terminal device to timely and lowly feedback the channel state of the fast fading channel, and CDD does not need such fast channel feedback or channel feedback; 2. the terminal equipment performs ultra-high reliability and low latency (URLLC) transmission: the transmission time of the URLLC is relatively short, and in order to increase the robustness of transmission, the CDD can be used for diversity transmission; 3. and transmitting in an unlicensed frequency band (Grant-free).

Before describing embodiments of the present application, the CDD techniques are introduced. Fig. 2 is a schematic diagram illustrating the basic principle of the time domain implementation of CDD in the prior art. The terminal equipment obtains N after the bit stream to be sent is processed by forward error correction coding, interleaving, modulation mapping and the like_FFTData symbols s (k), k ═ 0,1, …, N_FFT-1. These N_FFTAfter OFDM modulation, each symbol is transformed to the time domain to obtain an OFDM time domain signal, which is recorded as

And copying the OFDM time domain signal to M branches, wherein M is the number of the antennas. Each branched signal needs to be cyclically delayed, and cyclic delay is needed to be carried out respectively₀、₁、…、_M-1(ii) a Each of the split signals is then inserted into the CP and transmitted through an antenna. It should be noted that, before transmission, the transmission power P of each antenna can also be determined₀、P₁、…、P_M-1。

For example, the signal s transmitted on the nth antenna of the M antennas_n(l) The following formula can be satisfied:

wherein n is 0,1, … M-1; is-N_g,…,N_FFT-1；P_nIs the transmit power of the cyclically shifted OFDM signal on the nth antenna. Time domain l ═ N_g…, -1 is a cyclic guard interval part. Compared with the traditional Delay Diversity (DD), because the time domain signal of the CDD passes through the cyclic delay and the cyclic prefix, the extra delay is eliminated, and thus the size of the cyclic delay does not depend on the guard interval N any more_gLength of (d). mod denotes a modulo operation.

Note that the formula (1) may be equivalent to the following formula (2):

equation (2) is the equation that the signal transmitted on the nth antenna satisfies when CDD is frequency domain implementation. Since the signal delay in the time domain is equivalent to the phase rotation in the frequency domain, a time domain implementation equivalent to a frequency domain implementation of CDD can be shown in fig. 3. The frequency domain implementation of CDD may also be referred to as Spatial Phase Diversity (SPD). Fig. 3 is a schematic diagram illustrating the basic principle of the frequency domain implementation of CDD in the prior art. The precoding matrix used for precoding in fig. 3 is represented by formula (2)

Specifically, the following can be referred to:

in the precoding matrix, each element on the diagonal is the precoding of the signal on one antenna.

Because CDD is an uplink transmit diversity transparent to the network equipment, the network equipment does not need to know the prior information (such as the number of transmit antennas, the transmit diversity mode, diversity parameters and the like) of the transmit diversity, and can complete the subsequent demodulation only by carrying out transparent or equal weight combination on the received signals, and all diversity processing is realized autonomously by the terminal equipment without modifying a protocol.

For example, assuming that after a signal transmitted by CDD passes through a quasi-static fading channel, a network device performs transparent superposition processing on the received signal, removes a guard interval, and performs Fourier transform (FFT) demultiplexing to obtain r (k) satisfying:

where N (k) is complex Gaussian noise, H_n(n) is the frequency domain channel attenuation coefficient of each subcarrier k from the nth antenna of the terminal equipment to the receiving antenna of the network equipment:

it is assumed here that h_n(l) Satisfying independent complex gaussian distributions. Thus, a CDD system can be described in the frequency domain as a multiplication of frequency domain symbols by a linearly increasing phase factor, and can also be characterized as a single antenna system whose equivalent channel transfer function satisfies equation (5) below.

As can be seen from the above formula, the equivalent channel transfer function is formed by overlapping a plurality of paths with different delays, and the cyclic delay_nThis delay is exacerbated and thus increases the frequency selectivity of the channel, causing the signal to experience uncorrelated fading, which is beneficial for diversity gain improvement in conjunction with channel coding use in CDD systems.

It should be noted that the diversity gain of CDD must be obtained by combining the corresponding signal interleaving and channel coding. Wherein the channel coding is used as an outer code, and the function of the channel coding is to improve the system performance by adding certain information redundancy. If these redundant information are subjected to respective different fading via the channel, diversity gain can be obtained by channel decoding at the time of demodulation to improve performance. If these redundant information experiences a flat fading channel, each experiencing associated fading, then demodulation can only achieve coding gain. The CDD is used as an internal code, the cyclic delay processing performed in the OFDM symbol has the function of converting space diversity into frequency diversity among subcarriers, equivalent frequency selective fading is obtained through the cyclic delay of multiple antennas, and the correlation of subchannels is reduced. Thus, combining channel coding and signal interleaving, the diversity gain can be obtained by using the uncorrelated fading introduced by CDD. The CDD system performance, if not used in conjunction with channel coding, is consistent with the system performance without CDD applied.

In the embodiment of the present application, the terminal device is a device having a wireless transceiving function or a chip that can be disposed in the device. The device with wireless transceiving function may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a user agent, or a user equipment. In practical applications, the terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios. The device with the wireless transceiving function and the chip capable of being arranged in the device are collectively referred to as a terminal device in the present application.

In the embodiment of the present application, the network device may be a wireless access device in various systems, such as an evolved Node B (eNB), a Radio Network Controller (RNC) or a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved Node B or home Node B), a Base Band Unit (BBU), an access point (access point, AP) in a wireless fidelity (WIFI) system, a wireless relay Node, a wireless backhaul Node, a transmission point (transmission and reception point, TRP or transmission point, etc., and may also be a gbb or a transmission point (TRP or TP) in a 5G (nr) system, one or a group of antennas of base stations in the 5G system may include multiple antennas, or may also constitute a network panel, such as a baseband unit (BBU), or a DU under a centralized-distributed (CU-DU) architecture.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

Referring to fig. 4, a schematic flow chart of a signal transmission method according to an embodiment of the present application is shown. The method comprises the following steps:

step 401: when terminal equipment transmits an uplink signal by adopting a diversity transmission technology, the terminal equipment acquires a first parameter and a first cyclic delay under the condition that the terminal equipment does not receive a first reference signal from network equipment.

The first parameter may be a current first moving speed of the terminal device, or a size of a first Resource Block (RB) currently used by the terminal device, and the first parameter may also be another parameter, which is not limited in this embodiment of the present application.

How the terminal device obtains the first parameter is not limited in the embodiment of the present application. For example, when the first parameter is the current first moving speed of the terminal device, in a possible implementation manner, the terminal device may determine the moving distance and the consumed time length of the terminal device according to the sensor information of the terminal device, so as to calculate the first moving speed of the terminal device; in another possible implementation manner, the first moving speed of the terminal device may be estimated according to a doppler shift. Wherein the sensor information includes, but is not limited to, a combination of one or more of: acceleration sensor information; gravity sensor information; gyroscope information. When the first parameter is the other condition, it is not described herein again.

The first parameter is a first cyclic delay, which is determined by the terminal device according to a second reference signal from the network device before step 402. In a possible implementation manner, the second reference signal is a reference signal received last before the terminal device sends the uplink signal, so that it is ensured that the first cyclic delay can accurately reflect the current channel quality of the terminal device.

In this embodiment, the first reference signal or the second reference signal may be any of the following signals: primary Synchronization Signal (PSS); secondary Synchronization Signal (SSS); a Physical Broadcast Channel demodulation reference Signal (PBCH DM-RS); physical broadcast channel data (PBCH Date); demodulating Reference Signal (DM-RS); channel state information Reference Signal (CSI-RS).

Step 402: and the terminal equipment determines a second cyclic delay according to the first parameter and the first cyclic delay, and transmits the uplink signal by adopting a diversity transmission technology according to the second cyclic delay.

Step 403: the network equipment receives the uplink signal from the terminal equipment.

Under the condition that the terminal equipment does not receive a first reference signal from the network equipment, the uplink signal is sent by the terminal equipment by adopting a diversity transmission technology according to a second cyclic delay, the second cyclic delay is determined according to a first parameter and a first cyclic delay, and the first parameter is the current first moving speed of the terminal equipment or the current first RB number used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network device before the terminal device transmits the uplink signal by using a diversity transmission technology.

Correspondingly, when the terminal device receives the first reference signal, the second cyclic delay is determined according to a signal phase difference on a receiving antenna of the terminal device, and the signal phase difference is determined according to the first reference signal.

Step 404: the network device demodulates the uplink signal.

How to demodulate the uplink signal is specifically performed by the network device, which is not limited in this embodiment of the application and is not described herein again.

By the method, when the terminal equipment does not receive the reference signal, the terminal equipment can adjust the first cyclic delay according to the first moving speed or the first RB to obtain the second cyclic delay, so that the cyclic delay required by signal sending is determined in real time, the accuracy of the cyclic delay is improved, and the diversity gain is improved.

In step 401, in a possible implementation manner, the terminal device may receive indication information of the network device, where the indication information is used to indicate whether the terminal device transmits the uplink signal by using a diversity transmission technology. At this time, the terminal device may determine that the uplink signal needs to be transmitted by using the diversity transmission technology according to the indication information.

In another possible implementation manner, the terminal device may determine whether to transmit the uplink signal by using a diversity transmission technique based on Reference Signal Receiving Power (RSRP). For example, the terminal device determines that the RSRP of the serving cell where the terminal device is located or the predicted value of the RSRP of the serving cell is lower than a preset threshold of the terminal device; at this time, it indicates that the terminal device is in the downlink weak coverage area, and the terminal device will also be in the uplink weak coverage area. At this time, the terminal device may determine to transmit the uplink signal by using the uplink diversity transmission technique. For another example, the terminal device determines that the RSRP of the serving cell where the terminal device is located is lower than the preset threshold of the terminal device, and the RSRP descending slope is larger. When the average slope of the RSRP drop of the serving cell is larger, the movement speed of the terminal equipment can be reflected to be faster. For example, the reference average slope is set to-1, and when the RSRP is lower than the preset threshold and the measured average slope thereof is smaller than-1, the terminal device may determine to transmit the uplink signal by using the uplink diversity transmission technique.

In another possible implementation manner, the terminal device may determine whether to transmit the uplink signal by using a diversity transmission technique based on a Timing Advance (TA). When the terminal device is in a Radio Resource Control (RRC) CONNECTED state (RRC _ CONNECTED), the network device may measure a transmission delay from the terminal device to the network device according to an uplink signal of the terminal device, continuously update a TA value, and send the TA value to the terminal device. Therefore, the terminal equipment can judge whether to use the uplink transmission diversity according to the change situation of the TA value. For example, when the TA value is greater than the preset threshold, the terminal device may be considered to be in a cell weak coverage area, and thus the terminal device may transmit the uplink signal by using a diversity transmission technology.

When the terminal equipment determines that an uplink signal needs to be transmitted by adopting a diversity transmission technology, whether a first reference signal is received in a preset time period before the uplink signal is transmitted can be judged, if the first reference signal is received, a signal phase difference on a receiving antenna of the terminal equipment can be determined according to the first reference signal, and then the second cyclic delay is determined according to the signal phase difference; and finally, the terminal equipment transmits the uplink signal by adopting a diversity transmission technology according to the second cyclic delay.

It should be noted that how the terminal device determines the signal phase difference according to the first reference signal, and how to determine the second cyclic delay according to the signal phase difference, which is not limited in this embodiment of the application and is not described herein again.

Correspondingly, in a preset time period before the terminal device sends the uplink signal, when the terminal device does not receive the first reference signal, in order to obtain a larger diversity gain, the terminal device needs to determine the cyclic delay in real time according to the channel quality, that is, before step 402, when the terminal device receives the second reference signal at the first moment, the terminal device may determine the first cyclic delay according to the second reference signal, and the terminal device may store the first cyclic delay, and may also store information such as the second moving speed of the terminal device at the first moment. The first time is before a second time, and the second time is the time for sending the uplink signal. In step 402, the terminal device may determine a second cyclic delay according to the first parameter and the first cyclic delay, which is described in the following cases.

The first possible scenario: the first parameter is a first moving speed of the terminal device, and the terminal device may determine the second cyclic delay according to the first moving speed and the first cyclic delay.

When the terminal device does not receive the first reference signal, for fast fading caused by a large moving speed of the terminal device, the coherence time is short, so a large cyclic delay should be selected. When the moving speed is small, and the moving speed is in a slow fading state, a relatively small cyclic delay time should be selected. It should be noted that the terminal device does not receive the first reference signal, which may be because the transmission period of the first reference signal is relatively long, and the terminal device cannot obtain the first reference signal in real time, for example, when the first reference signal is an SSB, the transmission period of the SSB may be 160ms, and the terminal device cannot receive the SSB in real time; it may also be that the terminal device cannot receive the CSI-RS or DM-RS because the network device does not transmit the first reference signal, for example, when the first reference signal is the CSI-RS or DM-RS, the network device may configure other types of reference signals without transmitting the CSI-RS or DM-RS. Of course, other reasons are possible and will not be described in detail herein.

In combination with the above description, further, the terminal device may determine a first ratio of the first moving speed to the second moving speed; the terminal device may determine the second cyclic delay according to a product of the first ratio and the first cyclic delay.

For example, the terminal device may determine the second cyclic delay according to the following formula

Wherein the content of the first and second substances,representing the first cyclic delay, V_tDenotes a first moving speed, V_[t]Representing a second moving speed; m is_tThe first predetermined weight value is a parameter factor, which may be related to the number of subcarriers, frequency, and channel environment.

The terminal device may transmit the uplink signal according to the second cyclic delay. For example, the uplink signal sent by the terminal device on the nth antenna may satisfy formula (1) or formula (2), where the cyclic delay in formula (1) or formula (2) uses the second cyclic delay, and other parameters in formula (1) or formula (2) may be determined according to an actual situation, which is not described herein again.

The second possible scenario: the first parameter is a first moving speed of the terminal device, and the terminal device may determine a second cyclic delay from a preset mapping table according to the first moving speed and the first cyclic delay.

In this case, a preset mapping table including the moving speed and the cyclic delay may be established in advance according to the cyclic delay determined by the reference signal received each time and the speed of the terminal device. In a first implementation manner, the preset mapping table may be a mapping relationship between a moving speed and a cyclic delay, for example, as shown in table 1.

TABLE 1

Speed of movement	Cyclic delay
		V1≤V＜V2	Δ1，1
V2≤V＜V3	Δ1，2
		……	……
VQ-1≤V＜VQ	Δ1，Q

When the terminal device determines the first moving speed, the cyclic delay mapped with the first moving speed may be determined from a preset mapping table, for example, the first moving speed is located at V₁And V₂In time between, the cyclic delay of the mapping is Δ_1,1The second cyclic delay can be determined as Δ_1,1。

In a second implementation manner, the preset mapping table may be a mapping relationship between a moving speed, a cyclic delay and a channel type, for example, as shown in table 2.

TABLE 2

The terminal device may determine a channel type corresponding to the first cyclic delay according to the first cyclic delay. The channel type corresponding to the first cyclic delay is the channel type of a channel between a receiving antenna of the terminal device and the network device when the first cyclic delay is determined by the terminal device. And the terminal equipment takes the cyclic delay mapped by the channel type corresponding to the first moving speed and the first cyclic delay as a second cyclic delay. For example, the first cyclic delay corresponds to channel type 2, the first moving speedThe cyclic delay of the mapping is Δ when it is between V2 and V3_2,2The second cyclic delay can be determined as Δ_2,2。

In the method, when the first reference signal is not received, the channel type may be determined according to the first cyclic delay, and it is assumed that the channel type is not changed in a relatively short time, that is, the channel type when the terminal device transmits the uplink signal is also the channel type corresponding to the first cyclic delay, so that the second cyclic delay may be determined according to the channel type corresponding to the first cyclic delay and the first moving speed, thereby ensuring the diversity gain.

A third possible scenario: the first parameter is a first number of RBs currently used by the terminal device, and the terminal device may determine the second cyclic delay according to the first number of RBs and the first cyclic delay.

Generally, the selection of the cyclic delay in CDD is strongly related to the bandwidth allocated in the transmission and the number of symbols. If the network device configures a large PRB for the terminal device, the terminal device has a large possibility of obtaining frequency diversity gain, and a large cycle should be selected correspondingly; and if the PRB configured by the terminal equipment is smaller at the moment, a smaller cyclic delay should be selected correspondingly. Therefore, when the terminal device receives the reference signal, the terminal device can accurately calculate the cyclic delay in the CDD based on the reference signal and record the PRB configuration at this time. Therefore, when the terminal device does not receive the reference signal, the terminal device may compare the current first RB number with the second RB number determined when the reference signal is received at the first time, and when the first RB number is greater than the second RB number, the first cyclic delay may be increased correspondingly, so as to obtain the second cyclic delay; when the first RB number is smaller than the second RB number, the first cyclic delay may be correspondingly reduced to obtain the second cyclic delay.

For example, the terminal device may determine a second ratio of the first RB number to the second RB number, and determine the second cyclic delay according to a product of the second ratio and the first cyclic delay.

For example, the terminal device may determine the second cycle according to the following formulaLoop time delay

Wherein the content of the first and second substances,representing the first cyclic delay, B_tDenotes the first RB number, V_[t]Represents a second RB number; u. of_tThe second predetermined weight value is a parameter factor, which may be related to frequency hopping factor, RB frequency, etc.

It should be noted that the terminal device may also determine the second cyclic delay according to the load status of the terminal device and in a manner that the number of RBs is the same, which is not described herein again.

On the network equipment side, prior information of the terminal equipment transmitting diversity is not required to be known, the prior information comprises information such as whether diversity transmission, a diversity mode, the number of transmitting antennas, cyclic delay, transmitting power of each antenna and the like are adopted, and signal recovery can be completed only by carrying out equal-weight-value superposition receiving, CP removing processing, OFDM demodulation, digital signal demodulation, de-interleaving and channel decoding on multi-antenna transmitting diversity signals from the terminal equipment side, and diversity gain is obtained, which is not described herein again.

The above process is described below by a specific embodiment.

As shown in fig. 5, the network device may transmit the reference signal according to a preset period, and in fig. 5, the network device sequentially transmits reference signals such as reference signal 1, reference signal 2, reference signal 3, and the like at different periods.

The method comprises the following steps: the terminal device receives a reference signal 1 from the network device at time 1.

Step two: and when the terminal equipment determines to transmit the uplink signal 1 by adopting the diversity transmission technology, the terminal equipment transmits the uplink signal 1 by adopting CDD at the moment 2 according to the cyclic delay 1.

The cyclic delay 1 is determined according to the reference signal 1, and the specific determination manner may refer to descriptions in the prior art, which is not described herein again.

It should be noted that, for signals transmitted by the terminal device on each antenna, reference may be made to the description of formula (1) or formula (2), which is not described herein again.

Step three: when the terminal device needs to send the uplink signal 2 by using CDD at time 3, the terminal device determines whether a reference signal is received within a preset time period. Referring to fig. 5, the terminal device does not receive the reference signal, and at this time, the terminal device determines the cyclic delay 2 according to the cyclic delay 1, the moving speed 1, and the moving speed 2. The preset time period may be between time 2 and time 3, or may be any time period between time 2 and time 3.

Wherein, the moving speed 1 is the moving speed of the terminal device when receiving the reference signal 1, and the moving speed 2 is the current moving speed of the terminal device, for example, the cyclic delay 2 can be determined by using formula (6).

It should be noted that, in step three, the terminal device may also determine the cyclic delay 2 in other manners, which specifically refers to the foregoing description and is not described herein again.

Step four: and the terminal equipment transmits the uplink signal 2 by adopting CDD at the moment 3 according to the cyclic delay 2.

Step five: the terminal device receives the reference signal 2 at time 4.

Step six: when the terminal device needs to send the uplink signal 3 by using CDD at time 5, the terminal device determines whether a reference signal is received within a preset time period. At this time, the terminal device receives the reference signal 4 at time 4, and determines the cyclic delay 3 according to the reference signal 2. The preset time period may be between time 3 and time 5, or may be any time period between time 3 and time 5.

Step seven: and the terminal equipment transmits the uplink signal 3 by using CDD at the moment 5 according to the cyclic delay 3.

In other cases, reference may be made to steps one to seven, which are not described herein again.

Fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus may be configured to perform the actions of the terminal device or the network device in the foregoing method embodiments, where the communication apparatus 600 includes: a transceiver 601 and a processing unit 602.

When communication apparatus 600 executes the operation of the terminal device in the above-described flow:

a processing unit 602, configured to obtain a first parameter and a first cyclic delay when an uplink signal is sent by using a diversity transmission technique and without receiving a first reference signal from a network device; the first parameter is a current first moving speed of the terminal equipment or a current first resource block RB quantity used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal; determining a second cyclic delay according to the first parameter and the first cyclic delay;

a transceiver 601, configured to transmit the uplink signal by using a diversity transmission technology according to the second cyclic delay.

In an optional implementation, the processing unit 602 is further configured to:

under the condition that the first reference signal is received, determining a signal phase difference on a receiving antenna of the terminal equipment according to the first reference signal; determining the second cyclic delay according to the signal phase difference;

the transceiver 601 is further configured to transmit the uplink signal by using a diversity transmission technology according to the second cyclic delay.

In an optional implementation manner, when the first parameter is a first moving speed of the terminal device, the processing unit 602 is specifically configured to:

determining a first ratio of the first parameter to a second movement speed; the second moving speed is the moving speed of the terminal equipment at a first moment, and the first moment is the moment when the terminal equipment receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal;

and determining the second cyclic delay according to the product of the first ratio and the first cyclic delay.

In an optional implementation manner, when the first parameter is a first moving speed of the terminal device, the processing unit 602 is specifically configured to:

determining the cyclic delay mapped with the first moving speed and the first cyclic delay in a preset mapping table as the second cyclic delay according to the first moving speed; the preset mapping table comprises a mapping relation between the moving speed and the cyclic delay.

In an optional implementation manner, when the first parameter is a first number of RBs currently used by the terminal device, the processing unit 602 is specifically configured to:

determining a second ratio of the first parameter to a second number of RBs; the second number of RBs is a number of RBs used by the terminal device at a first time, and the first time is a time when the terminal device receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal;

and determining the second cyclic delay according to the product of the second ratio and the first cyclic delay.

In an optional implementation manner, the first reference signal is a synchronization signal block SSB or a channel state information reference signal CSI-RS or a data demodulation reference signal DM-RS.

In an optional implementation, the diversity transmission technique is cyclic delay diversity CDD or space-phase diversity SPD.

When communication apparatus 600 executes the operation of the network device in the above-described flow:

a transceiver 601, configured to receive an uplink signal from a terminal device; under the condition that the terminal equipment does not receive a first reference signal from the network equipment, the uplink signal is sent by the terminal equipment by adopting a diversity transmission technology according to a second cyclic delay, the second cyclic delay is determined according to a first parameter and a first cyclic delay, and the first parameter is the current first moving speed of the terminal equipment or the current number of first Resource Blocks (RB) used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal;

a processing unit 602, configured to demodulate the uplink signal.

In an optional implementation manner, in a case where the terminal device receives the first reference signal, the second cyclic delay is determined according to a signal phase difference on a receiving antenna of the terminal device, where the signal phase difference is determined according to the first reference signal.

Fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application. The terminal device shown in fig. 7 may be a hardware circuit implementation of the communication apparatus shown in fig. 6. The terminal device may be adapted to the flowchart shown in fig. 4, and perform the functions of the terminal device in the above method embodiment. For convenience of explanation, fig. 7 shows only main components of the terminal device. As shown in fig. 7, the terminal device 700 includes a processor 701, a memory 702, a transceiver 703, an antenna 704, and an input-output apparatus 705. The processor 701 is mainly used for processing the communication protocol and the communication data, controlling the whole wireless communication device, executing the software program, processing data of the software program, for example, for supporting the wireless communication device to perform the actions described in the above method embodiments. The memory 702 is used primarily for storing software programs and data. The transceiver 703 is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The antenna 704 is primarily used for transceiving radio frequency signals in the form of electromagnetic waves. The input/output device 705, such as a touch screen, a display screen, a keyboard, etc., is mainly used for receiving data input by a user and outputting data to the user.

The processor 701 is configured to, when an uplink signal is sent by using a diversity transmission technology, acquire a first parameter and a first cyclic delay without receiving a first reference signal from a network device; the first parameter is a current first moving speed of the terminal equipment or a current first resource block RB quantity used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal; determining a second cyclic delay according to the first parameter and the first cyclic delay;

a transceiver 703, configured to transmit the uplink signal by using a diversity transmission technology according to the second cyclic delay.

In an optional implementation, the processor 701 is further configured to:

under the condition that the first reference signal is received, determining a signal phase difference on a receiving antenna of the terminal equipment according to the first reference signal; determining the second cyclic delay according to the signal phase difference;

the transceiver 703 is further configured to transmit the uplink signal by using a diversity transmission technology according to the second cyclic delay.

In an optional implementation manner, when the first parameter is a first moving speed of the terminal device, the processor 701 is specifically configured to:

determining a first ratio of the first parameter to a second movement speed; the second moving speed is the moving speed of the terminal equipment at a first moment, and the first moment is the moment when the terminal equipment receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal;

and determining the second cyclic delay according to the product of the first ratio and the first cyclic delay.

In an optional implementation manner, when the first parameter is a first moving speed of the terminal device, the processor 701 is specifically configured to:

determining the cyclic delay mapped with the first moving speed and the first cyclic delay in a preset mapping table as the second cyclic delay according to the first moving speed; the preset mapping table comprises a mapping relation between the moving speed and the cyclic delay.

In an optional implementation manner, when the first parameter is a first number of RBs currently used by the terminal device, the processor 701 is specifically configured to:

determining a second ratio of the first parameter to a second number of RBs; the second number of RBs is a number of RBs used by the terminal device at a first time, and the first time is a time when the terminal device receives the second reference signal; the first time is before a second time, and the second time is the time for sending the uplink signal;

and determining the second cyclic delay according to the product of the second ratio and the first cyclic delay.

In an optional implementation manner, the first reference signal is a synchronization signal block SSB or a channel state information reference signal CSI-RS or a data demodulation reference signal DM-RS.

In an optional implementation, the diversity transmission technique is cyclic delay diversity CDD or space-phase diversity SPD.

Fig. 8 shows a schematic structural diagram of a network device, and the terminal device shown in fig. 8 may be implemented as a hardware circuit of the communication apparatus shown in fig. 6. The network device may be adapted to the flowchart shown in fig. 4 to perform the functions of the network device in the above-described method embodiments. Network device 800 includes a processor 801, memory 802, radio frequency circuits 803, antenna 804, and the like.

The network device 800 may be configured to implement the method of the network device in the foregoing method embodiment, specifically:

a radio frequency circuit 803, configured to receive an uplink signal from a terminal device; under the condition that the terminal equipment does not receive a first reference signal from the network equipment, the uplink signal is sent by the terminal equipment by adopting a diversity transmission technology according to a second cyclic delay, the second cyclic delay is determined according to a first parameter and a first cyclic delay, and the first parameter is the current first moving speed of the terminal equipment or the current number of first Resource Blocks (RB) used by the terminal equipment; the first cyclic delay is determined according to a second reference signal from the network equipment before the terminal equipment adopts a diversity transmission technology to transmit an uplink signal;

a processor 801 configured to demodulate the uplink signal.

In an optional implementation manner, in a case where the terminal device receives the first reference signal, the second cyclic delay is determined according to a signal phase difference on a receiving antenna of the terminal device, where the signal phase difference is determined according to the first reference signal.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.