Symbol processing method, communication device and communication system

Abstract

The invention discloses a symbol processing method, a communication device and a communication system, and relates to the technical field of communication. The method comprises: a first communication device generating a first time slot, the first time slot comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols, the plurality of OFDM symbols comprising a first OFDM symbol and a second OFDM symbol, the first OFDM symbol being the first OFDM symbol in the plurality of OFDM symbols, the first OFDM symbol comprising a first cyclic prefix (CP), the second OFDM symbol comprising a second CP, the length of the first CP being greater than the length of the second CP, the length of the first CP being greater than the length of the second CP, and the length of the second CP being greater than the length of the second CP; the length of the first CP is greater than a first value, and the first value corresponds to a subcarrier interval; a first communication device sends a first time slot, and correspondingly, a second communication device receives the first time slot. By adopting the embodiment of the invention, the signal loss can be reduced, and the demodulation performance is ensured.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a symbol processing method, a communication device and a communication system. Background Art

[0002] The cyclic prefix (CP) can be used as a guard interval between symbols to resist the multipath effect of the channel. The transmitter can copy part of the signal at the end of each symbol (i.e., the symbol component) and add it to the position before the symbol to obtain the CP of the symbol to increase the guard time interval.

[0003] Exemplarily, in a wireless communication system, a terminal device and a network device can communicate based on orthogonal frequency division multiplexing (OFDM) symbols. Each OFDM symbol corresponds to a fast Fourier transform (FFT) receiving window, and the receiving end receives the corresponding OFDM symbol in the FFT receiving window. Each OFDM symbol includes a CP and a data symbol. The length of the FFT receiving window corresponding to each OFDM symbol is the length of the data symbol of an OFDM symbol, and the starting position of the FFT receiving window corresponding to each OFDM symbol is determined according to the end position of the CP.

[0004] However, due to refraction, reflection and other phenomena when the signal is transmitted in the channel, the signal is transmitted to the receiving end through multiple transmission paths. When the arrival delay difference between the two transmission paths of the channel is large, the OFDM symbols on some transmission paths cannot fall completely within the corresponding FFT receiving window, resulting in partial signal loss of the OFDM symbol and reduced demodulation performance. Summary of the invention

[0005] The embodiments of the present application provide a symbol processing method, a communication device and a communication system, which can reduce signal loss and ensure demodulation performance.

[0006] In a first aspect, an embodiment of the present application provides a symbol processing method, which can be performed by a first communication device, where the first communication device can refer to the first communication device itself, or a processor, module, chip, or chip system that implements the method in the first communication device, without limitation. The method includes:

[0007] Generate a first time slot, the first time slot includes multiple orthogonal frequency division multiplexing OFDM symbols, the multiple OFDM symbols include a first OFDM symbol and a second OFDM symbol, the first OFDM symbol is the first OFDM symbol of the multiple OFDM symbols, the first OFDM symbol includes a first cyclic prefix CP, the second OFDM symbol includes a second CP, the length of the first CP is greater than the length of the second CP, the length of the first CP is greater than a first value, and the first value corresponds to the subcarrier spacing; send the first time slot.

[0008] In an embodiment of the present application, the first value may be the length of the CP specified in the existing protocol. The first value corresponds to the subcarrier spacing, that is, the first value has different values ​​under different subcarrier spacings. In an embodiment of the present application, the length of the first CP may be extended, that is, more signals may be copied from the tail of the first OFDM symbol to the front of the first OFDM symbol, so that the first OFDM symbol transmitted on each transmission path can fall within the corresponding FFT receiving window, thereby reducing signal loss and improving demodulation performance.

[0009] In combination with the first aspect, in a possible implementation manner, the first communication device is a terminal device, and the method further includes:

[0010] First indication information is received, where the first indication information indicates a length of the first CP.

[0011] In combination with the first aspect, in a possible implementation method, the first indication information is carried by any one of the following: downlink control information, wireless resource control signaling, media access control (MAC) control element (CE), system information block (SIB), and physical downlink shared channel (PDSCH).

[0012] In combination with the first aspect, in a possible implementation manner, the first communication device is a network device, and the method further includes:

[0013] The length of the first CP is determined based on a delay spread of a first channel, where the delay spread is a difference in transmission delays of the first time slot in a first transmission path and a second transmission path of the first channel, and the first channel carries the first time slot.

[0014] In combination with the first aspect, in a possible implementation manner, the first communication device is a terminal device, the first time slot is included in a first subframe, and the method further includes:

[0015] Receive second indication information, the second indication information including at least one of the following: a first timing advance TA, a start time of the first CP, and a second difference, wherein the first TA is used to indicate the advance time of the start time of the first subframe compared to the arrival time of the downlink subframe, and the second difference is the difference between the start time of the first CP and the start time of the sixth symbol component in the first OFDM symbol, the end position of the sixth symbol component is the end position of the first CP, and the length of the sixth symbol component is greater than or equal to the length of the second CP; sending the first time slot includes: sending the first subframe based on the second indication information.

[0016] In the embodiment of the present application, the sixth symbol component can be understood as the CP before the CP of the first OFDM symbol is extended, and the length of the sixth symbol component is equal to the CP length before the CP of the first OFDM symbol is extended. In the case where the CP length of the first OFDM symbol changes, the network device can indicate the time when the terminal device sends the first subframe through the second indication information to ensure uplink timing synchronization between the terminal device and the network device.

[0017] In a second aspect, an embodiment of the present application provides a symbol processing method, which can be performed by a second communication device, where the second communication device can refer to the second communication device itself, or a processor, module, chip, or chip system that implements the method in the second communication device, without limitation. The method includes:

[0018] Receive a first time slot, the first time slot includes multiple orthogonal frequency division multiplexing OFDM symbols, the multiple OFDM symbols include a first OFDM symbol and a second OFDM symbol, the first OFDM symbol is the first OFDM symbol of the multiple OFDM symbols, the first OFDM symbol includes a first cyclic prefix CP, the second OFDM symbol includes a second CP, the length of the first CP is greater than the length of the second CP, the length of the first CP is greater than a first value, and the first value corresponds to the subcarrier spacing; parse the first time slot.

[0019] In combination with the second aspect, the second communication device is a network device, the first time slot is included in a first subframe, and the method further includes:

[0020] Send second indication information, the second indication information including at least one of the following: a first timing advance TA, a start time of the first CP, and a second difference, wherein the first TA is used to indicate the advance time of the start time of the first subframe compared to the arrival time of the downlink subframe, the second difference is the difference between the start time of the first CP and the start time of the sixth symbol component in the first OFDM symbol, the end position of the sixth symbol component is the end position of the first CP, and the length of the sixth symbol component is greater than or equal to the length of the second CP.

[0021] In combination with the first aspect or the second aspect, in a possible implementation manner, the index of the first OFDM symbol in the first subframe is 0 or 7*2. μ In the case of -μ +16β); or, the index of the first OFDM symbol in the first subframe is not equal to 0 or 7*2 μ In the case where the first value is equal to 144β*2 -μ ; wherein the first subframe includes the first time slot, the β corresponds to the maximum number of subcarriers and the maximum subcarrier spacing of the transmission bandwidth, and the μ corresponds to the subcarrier spacing configuration. Exemplarily, the β may be κ, κ=Ts / Tc=64.

[0022] In the embodiment of the present application, the first numerical value can be understood as the length of the first CP before extension. Each symbol in the first subframe can correspond to an index, and OFDM symbols with different indexes in the first subframe correspond to different CP lengths. The first numerical value is related to the index of the first OFDM symbol in the first subframe. The first OFDM symbol may have different values ​​if the index in the first subframe is different. The length of the first CP is greater than the first numerical value, which can be understood as the number of sampling points corresponding to the first CP is greater than the number of sampling points corresponding to the first numerical value, or the duration corresponding to the first CP is greater than the duration corresponding to the first numerical value.

[0023] In combination with the first aspect or the second aspect, in a possible implementation, the length of the first CP corresponds to the delay extension of the first channel, the delay extension indicates the difference in transmission delay of the first time slot in the first transmission path and the second transmission path of the first channel, and the first channel carries the first time slot.

[0024] In the embodiment of the present application, the length of the first CP is greater than the delay spread of the first channel, thereby ensuring that the first OFDM symbol on the first transmission path and the second transmission path can be completely received by the corresponding FFT receiving window to avoid signal loss. In addition, the signal of other OFDM symbols will not be received in the FFT receiving window corresponding to the first OFDM symbol to avoid inter-symbol interference.

[0025] In combination with the first aspect or the second aspect, in a possible implementation manner, the first transmission path is the first transmission path that arrives among multiple transmission paths of the first channel, and the second transmission path is the last transmission path that arrives among the multiple transmission paths.

[0026] In an embodiment of the present application, the first CP is determined by the transmission delay difference between the first transmission path and the second transmission path, which can ensure that the first OFDM symbol on each transmission path of the multiple transmission paths can fall within the corresponding FFT receiving window, thereby avoiding signal loss and inter-symbol interference.

[0027] In combination with the first aspect or the second aspect, in a possible implementation manner, the length of the first CP is greater than or equal to the delay spread.

[0028] In combination with the first aspect or the second aspect, in a possible implementation manner, the length of the first CP is determined by the delay extension and at least one of a modulation and coding scheme (MCS), a code rate, and a modulation method.

[0029] In an embodiment of the present application, different MCS or modulation modes have different error vector magnitude (EVM) requirements. For example, in a high-order modulation mode or a large MCS or a large code rate, a smaller EVM indicator needs to be met to ensure the accuracy of demodulation. In a low-order modulation mode or a small MCS or a small code rate, a larger EVM can also meet the accuracy of demodulation. Therefore, after determining the length of the first CP according to the delay spread of the channel, the length of the first CP can also be adjusted according to the modulation mode or MCS or code rate to meet the demodulation performance.

[0030] In combination with the first aspect or the second aspect, in a possible implementation method, the length of the first CP is positively correlated with the MCS; or, the length of the first CP is positively correlated with the modulation order corresponding to the modulation method; or, the length of the first CP is positively correlated with the code rate.

[0031] In combination with the first aspect or the second aspect, in a possible implementation manner, the multiple OFDM symbols are used to carry PDSCH or a physical uplink shared channel (physical uplink shared channel, PUSCH).

[0032] In an embodiment of the present application, the first OFDM is the first OFDM symbol among multiple OFDM symbols used to carry PDSCH or PUSCH in the first time slot. By extending the CP length of the first OFDM symbol, the loss of service data on the OFDM symbol can be effectively avoided.

[0033] In combination with the first aspect or the second aspect, in a possible implementation, the end position of the first OFDM symbol is the same as the starting position of the second OFDM symbol, and the first symbol component in the first OFDM symbol is the same as the second symbol component in the second OFDM symbol, wherein the end position of the first symbol component is the end position of the first OFDM symbol, the second symbol component is located before the third symbol component in the second OFDM symbol, the end position of the third symbol component is the same as the end position of the second OFDM symbol, the length of the third symbol component is less than or equal to the length of the second CP, and the second CP is obtained by the third symbol component.

[0034] In the embodiment of the present application, the first OFDM symbol is continuous with the second OFDM symbol in the time domain, and the first OFDM symbol is before the second OFDM symbol. The termination position of the first symbol component in the first OFDM symbol is the same as the starting position of the second CP. Since the first symbol component is the same as the second symbol component, the second CP is the same as the third symbol component, and the symbol component composed of the first symbol component and the second CP is the same as the symbol component composed of the second symbol component and the third symbol component, therefore, the symbol component composed of the first symbol component and the second CP can be regarded as the equivalent CP of the second symbol, and the equivalent CP length of the second OFDM symbol is the sum of the length of the second CP and the length of the first symbol component, so as to achieve the equivalent extension of the CP of the second OFDM symbol, so as to ensure that the second OFDM symbol can be completely received by its corresponding receiving window, avoid signal loss, and make the single carrier signal have stronger anti-inter-symbol interference (ISI) capability and low adjacent channel leakage ratio (ACLR).

[0035] In combination with the first aspect or the second aspect, in a possible implementation, the fourth symbol component in the first OFDM symbol is the same as the fifth symbol component in the second OFDM symbol, the starting position of the fourth symbol component is the same as the ending position of the first CP, the ending position of the second symbol component is the same as the starting position of the fifth symbol component, the ending position of the fifth symbol component is the same as the starting position of the third symbol component, and the sum of the lengths of the fifth symbol component and the third symbol component is equal to the length of the second CP.

[0036] In the embodiment of the present application, the first symbol component and the second CP are continuous in time delay, and the second symbol component, the fifth symbol component and the third symbol component are continuous in time delay. The symbol component composed of the first symbol component and the second CP is the same as the symbol component composed of the second symbol component, the fifth symbol component and the third symbol component. Therefore, the symbol component composed of the first symbol component and the second CP can be used as the equivalent CP of the second OFDM, realizing the equivalent extension of the CP of the second OFDM symbol, thereby ensuring that the second OFDM symbol can be completely received by its corresponding receiving window to avoid signal loss.

[0037] In combination with the first aspect or the second aspect, in a possible implementation manner, the second indication information includes the first TA, the first TA is determined by a first difference or the length of the first CP, and the first difference is the difference between the length of the first CP and the length of the second CP.

[0038] In the embodiment of the present application, the first TA can be determined by the first difference or the length of the first CP, or the first TA can be determined by the extension amount of the first CP. Determining the first TA according to the length of the extended CP or the extension amount of the CP makes the configuration of the first TA more reasonable.

[0039] In combination with the first aspect or the second aspect, in a possible implementation manner, the starting time of the first subframe is the starting time of the sixth symbol component.

[0040] In combination with the first aspect or the second aspect, in a possible implementation method, the value range of the first TA includes (TA2-CP1+ΔT, TA2); wherein the CP1 is the length of the first CP, the ΔT is the delay extension of the first channel carrying the first subframe, the TA2 is the TA corresponding to the second subframe, the second subframe includes a second time slot, the CP length of the third OFDM symbol in the second time slot is less than the length of the first CP, and the CP length of the third OFDM symbol is greater than or equal to the CP length of other OFDM symbols in the second time slot, and the third OFDM symbol is the first OFDM symbol among multiple OFDM symbols in the second time slot for carrying PUSCH or PDSCH.

[0041] In an embodiment of the present application, the second subframe can be understood as the first subframe before the first CP is extended, or a subframe that does not support CP extension. The third OFDM symbol can be understood as the first OFDM symbol before the first CP is extended, and the second TA can be understood as the TA corresponding to the first subframe before the first CP is extended. When the first TA takes TA2, the data symbol of the first OFDM symbol on the first transmission path (i.e., the path where the first transmission arrives) is completely received by the first FFT receiving window. When the first TA takes TA2-CP1+ΔT, the data symbol of the first OFDM symbol on the second transmission path (i.e., the path where the last transmission arrives) is completely received by the first FFT receiving window. Therefore, the value range of the first TA is determined based on the second TA, the length of the first CP, and the delay extension, which can ensure that the first OFDM symbols on multiple transmission paths of the channel can be completely received by the first FFT receiving window to avoid signal loss.

[0042] In combination with the first aspect or the second aspect, in a possible implementation manner, the starting time of the first subframe is the starting time of the first CP.

[0043] In combination with the first aspect or the second aspect, in a possible implementation method, the value range of the first TA includes (TA2-CP1+ΔT+ΔD, TA2+ΔD); wherein the CP1 is the length of the first CP, the ΔT is the delay extension of the first channel carrying the first subframe, the ΔD is the first difference, the TA2 is the TA corresponding to the second subframe, the second subframe includes a second time slot, the CP length of the third OFDM symbol in the second time slot is less than the length of the first CP, and the CP length of the third OFDM symbol is greater than or equal to the length of the CP of other OFDM symbols in the second time slot, and the third OFDM symbol is the first OFDM symbol among multiple OFDM symbols in the second time slot for carrying PUSCH or PDSCH.

[0044] In an embodiment of the present application, when the first TA takes TA2+ΔD, the data symbol of the first OFDM symbol on the first transmission path (i.e., the path where the first transmission arrives) is completely received by the first FFT receiving window. When the first TA takes TA2-CP1+ΔT+ΔD, the data symbol of the first OFDM symbol on the second transmission path (i.e., the path where the last transmission arrives) is completely received by the first FFT receiving window. Therefore, by determining the value range of the first TA based on the second TA, the length of the first CP, the first difference, and the delay spread, it is possible to ensure that the first OFDM symbols on multiple transmission paths of the channel can be completely received by the first FFT receiving window, thereby avoiding signal loss.

[0045] In combination with the first aspect or the second aspect, in a possible implementation method, the second indication information includes at least one of the following information of the first TA: the number of sampling points corresponding to the first TA, the number of modulation symbols corresponding to the first TA, the duration corresponding to the first TA, and the number of unit times corresponding to the first TA.

[0046] In combination with the first aspect or the second aspect, in a possible implementation method, the second indication information is carried by any one of the following: downlink control information, radio resource control signaling, media access control MAC control element CE, system message SIB, physical downlink shared channel PDSCH, uplink control information, physical uplink shared channel PUSCH.

[0047] In a third aspect, an embodiment of the present application provides a communication device, which is used to execute the method in the first aspect or any possible implementation of the first aspect. The communication device includes a unit having the function of executing the method in the first aspect or any possible implementation of the first aspect.

[0048] In a fourth aspect, an embodiment of the present application provides a communication device, which is used to execute the method in the second aspect or any possible implementation of the second aspect. The communication device includes a unit having the function of executing the method in the second aspect or any possible implementation of the second aspect.

[0049] In the third aspect and the fourth aspect, the above communication device and the communication device may include a transceiver unit and a processing unit. For a detailed description of the transceiver unit and the processing unit, reference may also be made to the device embodiment shown below.

[0050] In a fifth aspect, an embodiment of the present application provides a communication device, the communication device comprising a processor, configured to execute the method described in any one of the first to fourth aspects or any possible implementation. Alternatively, the processor is configured to execute a program stored in a memory, and when the program is executed, the method described in any one of the first to second aspects or any possible implementation is executed.

[0051] In a possible implementation manner, the memory is located outside the above communication device.

[0052] In a possible implementation manner, the memory is located within the above-mentioned communication device.

[0053] In the embodiment of the present application, the processor and the memory may also be integrated into one device, that is, the processor and the memory may also be integrated together.

[0054] In a possible implementation manner, the communication device further includes a transceiver, where the transceiver is used to receive a signal or send a signal.

[0055] Sixth aspect, an embodiment of the present application provides a communication device, which includes a logic circuit and an interface, and the logic circuit is coupled to the interface; the logic circuit is configured to generate a first time slot; the interface is configured to input the first time slot.

[0056] It can be understood that for the communication device shown in the sixth aspect, reference can also be made to the first aspect or the specific implementation manners shown below.

[0057] Seventh aspect, an embodiment of the present application provides a communication device, which includes a logic circuit and an interface, and the logic circuit is coupled to the interface; the interface is configured to input a first time slot; the logic circuit is configured to parse the first time slot.

[0058] It can be understood that for the communication device shown in the seventh aspect, reference can also be made to the second aspect or the specific implementation manners shown below.

[0059] Eighth aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store a computer program. When it runs on a computer, the method shown in any one of the above first aspect to the second aspect or any possible implementation manner is executed.

[0060] Ninth aspect, an embodiment of the present application provides a computer program product, which includes a computer program. When it runs on a computer, the method shown in any one of the above first aspect to the second aspect or any possible implementation manner is executed.

[0061] Tenth aspect, an embodiment of the present application provides a computer program. When it runs on a computer, the method shown in any one of the above first aspect to the second aspect or any possible implementation manner is executed.

[0062] Eleventh aspect, an embodiment of the present application provides a communication system, which includes a first communication device and a second communication device. The first communication device is configured to execute the method shown in the above first aspect or any possible implementation manner of the first aspect, and the second communication device is configured to execute the method shown in the above second aspect or any possible implementation manner of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The following introduces the drawings related to the embodiments of the present application.

[0064] Figure 1A It is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application;

[0065] Figure 1B It is a schematic diagram of the architecture of another communication system provided by an embodiment of the present application;

[0066] Figure 2A It is a schematic structural diagram of a transmitter provided by an embodiment of the present application;

[0067] Figure 2B It is a schematic structural diagram of another transmitter provided by an embodiment of the present application;

[0068] Figure 3 It is a schematic diagram of delay spread provided by an embodiment of the present application;

[0069] Figure 4 It is a schematic structural diagram of a symbol provided by an embodiment of the present application;

[0070] Figure 5 It is a schematic flow diagram of DFT-s-OFDM symbol generation provided by an embodiment of the present application;

[0071] Figure 6 It is a schematic flow diagram of SC-QAM symbol generation provided by an embodiment of the present application;

[0072] Fig. 7A It is a schematic diagram of a signal interaction scenario provided by an embodiment of the present application;

[0073] Figure 7B It is a schematic diagram of another signal interaction scenario provided by an embodiment of the present application;

[0074] Figure 8 It is a schematic structural diagram of an OFDM symbol provided by an embodiment of the present application;

[0075] Fig. 9 It is an interaction schematic diagram of a communication method provided by an embodiment of the present application;

[0076] Fig.10 It is a schematic diagram of an OFDM symbol reception scenario provided by an embodiment of the present application;

[0077] Fig.11A It is a schematic structural diagram of another OFDM symbol provided by an embodiment of the present application;

[0078] Fig. 11B It is a schematic structural diagram of yet another OFDM symbol provided by an embodiment of the present application;

[0079] Fig.12 It is an interaction schematic diagram of another communication method provided by an embodiment of the present application;

[0080] Fig.13 It is a schematic diagram of the starting moment of a subframe provided by an embodiment of the present application;

[0081] Fig.14A It is a schematic diagram of another OFDM symbol reception scenario provided by an embodiment of the present application;

[0082] Fig. 14B This is another schematic diagram of a scenario of OFDM symbol reception provided in an embodiment of the present application;

[0083] Fig.15 is a schematic diagram of another subframe start time provided in an embodiment of the present application;

[0084] Fig.16A This is another schematic diagram of a scenario of OFDM symbol reception provided in an embodiment of the present application;

[0085] Fig. 16B This is another schematic diagram of a scenario of OFDM symbol reception provided in an embodiment of the present application;

[0086] Fig.17 is a structural diagram of a communication device provided in an embodiment of the present application;

[0087] Fig.18 is a structural diagram of another communication device provided in an embodiment of the present application;

[0088] Fig.19 It is a structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0089] The terms "first" and "second" in the specification, claims and drawings of the present application are only used to distinguish different objects, rather than to limit the order, timing, priority or importance of multiple objects. In the embodiment of the present application, "multiple" refers to two or more. In addition, the terms "including" and "having" and any variation thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. In addition, the character " / ", unless otherwise specified, generally indicates that the objects associated before and after are in an "or" relationship.

[0090] The "embodiment" mentioned in this article means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0091] It should be understood that in the present application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0092] The technical solution provided in the embodiments of the present application can be applied to various communication systems, for example, a satellite communication system, and a system integrating satellite communication and cellular network. Among them, the cellular network system may include but is not limited to: 5G system, global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, advanced long term evolution (LTE-A) system, new radio (NR) system, NR system evolution system, LTE on unlicensed band (LTE-based access to unlicensed spectrum, LTE-U) system, NR on unlicensed band (NR-based access to unlicensed spectrum, NR-U) system, universal mobile telecommunication system (UMTS), global interoperability for microwave access (worldwide interoperability for microwave The present invention relates to a mobile communication system, a wireless local area network (WLAN), a wireless fidelity (WiFi), a next generation communication system or other communication systems. Generally speaking, the number of connections supported by a traditional communication system is limited and easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but also support, for example, device to device (D2D) communication, machine to machine (M2M) communication, machine type communication (MTC), vehicle to vehicle (V2V) communication and other communication systems that will evolve in the future. The embodiments of the present application can also be applied to these communication systems.Satellite communication systems may include various non-terrestrial network systems, such as satellites or unmanned aircraft system (UAS) platforms, etc., which perform wireless frequency transmissions, and are not listed here one by one.

[0093] The technical solution provided in the present application can also be applied to machine type communication (MTC), long term evolution-machine (LTE-M), device-to-device (D2D) network, machine-to-machine (M2M) network, Internet of Things (IoT) network or other networks. Among them, the IoT network may include, for example, the Internet of Vehicles. Among them, the communication methods in the Internet of Vehicles system are collectively referred to as vehicle-to-everything (V2X, X can represent anything). For example, the V2X may include: vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication or vehicle-to-network (V2N) communication, etc. Exemplarily, the following is shown Figure 1A or Figure 1B In this process, terminal devices can communicate with each other through D2D technology, M2M technology or V2X technology.

[0094] like Figure 1A or Figure 1B As shown, the communication system provided by the embodiment of the present application may include at least one access network device and at least one terminal device.

[0095] The introductions to access network equipment and terminal equipment are as follows:

[0096] Exemplarily, the access network device may be a next generation node B (gNB), a next generation evolved node B (ng-eNB), or an access network device in future 6G communication. The access network device may be any device with wireless transceiver functions, including but not limited to the base stations shown above. The base station may also be a base station in a future communication system such as a sixth generation communication system. Optionally, the access network device may be an access node, a wireless relay node, a wireless backhaul node, etc. in a wireless local area network (WiFi) system. Optionally, the access network device may be a wireless controller in a cloud radio access network (CRAN) scenario. Optionally, the access network device may be a wearable device or a vehicle-mounted device, etc. Optionally, the access network device may also be a small station, a transmission reception point (TRP) (or may also be referred to as a transmission point), a transmission measurement function (TMF), etc. It is understandable that the access network device may also be a base station in a future evolved public land mobile network (PLMN), etc.

[0097] In some deployments, a base station (such as a gNB) may be composed of a centralized unit (CU) and a distributed unit (DU). That is, the functions of the base station in the access network are split, and some functions of the base station are deployed in a CU, and the remaining functions are deployed in the DU. And multiple DUs share one CU, which can save costs and facilitate network expansion. In other deployments of base stations, the CU can also be divided into CU-control plane (CP) and CU-user plane (UP), etc. In some other deployments of base stations, the base station can also be an open radio access network (ORAN) architecture, etc. This application does not limit the specific type of base station.

[0098] For ease of description, the method involved in this application will be introduced below by taking the access network device as a base station as an example.

[0099] Exemplarily, the terminal device may also be referred to as a user equipment (UE), a terminal, etc. A terminal device is a device with wireless transceiver functions, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water, such as on a ship; it can also be deployed in the air, for example, deployed on an airplane, a balloon or a satellite, etc. The terminal device can be a mobile phone, a tablet (Pad), a computer with wireless transceiver functions, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a customer-premises equipment (CPE), and so on. It can be understood that the terminal device can also be a terminal device in a future 6G network or a terminal device in a future evolved PLMN, etc.

[0100] It can be understood that the terminal device shown in this application may not only include a vehicle (such as a whole vehicle) in a vehicle-to-everything (V2X) network, but also include in-vehicle devices or in-vehicle terminals, etc. in a vehicle-to-everything (V2X) network. This application does not limit the specific form of the terminal device when it is applied to a vehicle-to-everything (V2X) network.

[0101] For ease of description, in the following, the terminal device will be taken as an example of a UE to introduce the method involved in this application.

[0102] Figure 1A In the shown communication system, it includes a base station and multiple UEs, such as Figure 1A UE1 and UE2 in it. In this communication system, the base station can send downlink signals such as configuration information or downlink control information (DCI) to UE1 and UE2, and UE1 and UE2 can send uplink signals such as SRS or physical uplink shared channel (PUSCH) to the base station. It can be understood that for the communication method between UEs, reference can be made to the above description and will not be elaborated here.

[0103] Figure 1B In the shown communication system, it includes a UE and multiple base stations, such as Figure 1B Base station 1, base station 2 and base station 3 in the communication system. In the communication system, base station 1, base station 2 and base station 3 can transmit data and control signaling for UE at the same time.

[0104] The above-mentioned communication equipment, such as Figure 1A or Figure 1B The base station and UE in the communication system may be configured with multiple antennas. The multiple antennas may include at least one transmitting antenna for sending signals and at least one receiving antenna for receiving signals, etc. The embodiment of the present application does not limit the specific structure of each communication device. Optionally, the communication system may also include other network entities such as a network controller and a mobility management entity, but the embodiment of the present application is not limited thereto.

[0105] exist Figure 1A or Figure 1B In the communication system shown, the terminal device and the network device can communicate based on orthogonal frequency-division multiplexing (OFDM) symbols or single carrier symbols. For example, discrete Fourier transformation-spread-OFDM (DFT-s-OFDM) symbols or single carrier quadrature amplitude modulation (SC-QAM) symbols. For example, when the terminal device and the network device communicate through the DFT-s-OFDM waveform, such as Figure 2A As shown, the transmitter includes but is not limited to the following functional modules:

[0106] Modulation module: used to map the coded bits into modulation symbols according to the modulation order. The modulation symbols can also be called complex symbols.

[0107] Time domain resource mapping module: used to divide all modulation symbols in a time slot into multiple block signals according to mapping rules or arrangement rules, or called serial-to-parallel conversion;

[0108] Transform domain precoding module (also called discrete Fourier transform module): used to convert multiple block signals into signals that can be mapped to frequency domain subcarriers in units of block signals;

[0109] Subcarrier mapping module: used to map signals that can be mapped to frequency domain subcarriers to subcarriers.

[0110] DFT-s-OFDM symbol generation module: used to perform fast inverse Fourier transform on the data of the subcarrier mapping module, add CP, obtain DFT-s-OFDM symbols, and send the DFT-s-OFDM symbols to the intermediate RF module.

[0111] like Figure 2B As shown, when the terminal device and the network device communicate via the SC-QAM waveform, the structure of the transmitter includes but is not limited to the following functional modules: a modulation module, a time domain resource mapping module, a CP adding module, and an SC-QAM symbol generation module.

[0112] For example, in Figure 2A or Figure 2B The input of the time-domain resource mapping module shown may include modulation symbols and a known sequence, and the output of the time-domain resource mapping module may include a complex array or vector of DFT-s-OFDM symbols or SC-QAM symbols.

[0113] Optionally, the input of the time domain resource mapping module may also include a reference signal sequence, such as a phase tracking reference signal (PTRS) sequence.

[0114] The following is a brief description of the technical concepts involved in the embodiments of the present application:

[0115] 1. Delay extension

[0116] When the signal is transmitted in the channel, there are refraction, reflection and other phenomena, so the signal is transmitted to the receiving end through multiple transmission paths. This phenomenon can also be called the multipath effect of the channel, and the channel can also be called a multipath channel. The signal received by the receiving end includes signals transmitted on multiple transmission paths, and the arrival time of signals on different transmission paths is different. The delay spread is the arrival time difference between different transmission paths in the multiple transmission paths of the channel. Figure 3 As shown, the signal can be transmitted through the first transmission path and the second transmission path. The first transmission path arrives at time T0, and the signal transmitted on the second transmission path arrives at time T1. The delay extension can be T1-T0.

[0117] Exemplarily, the arrival time difference between the transmission path where the first transmission arrives and the transmission path where the last transmission arrives in the channel may be referred to as the maximum delay spread of the channel.

[0118] In a multipath channel, signals transmitted on different transmission paths arrive at the receiving end at different times, causing inter-symbol interference (ISI). Figure 3The first symbol on the second transmission path falls into the time domain of the second symbol on the first transmission path in the time domain, that is, the receiving end receives the first symbol and the second symbol at the same time, causing inter-symbol interference.

[0119] 2. Cyclic prefix (CP)

[0120] The cyclic prefix (CP) can be used as a guard interval between symbols to resist the multipath effect of the channel. The transmitter can copy part of the signal at the end of each symbol (i.e., the symbol component) and add it to the position before the symbol to obtain the CP of the symbol to increase the guard time interval. Figure 4 Figure 1 is a schematic diagram of the time domain structure with CP as the protection interval between symbols. Figure 4 In the example, two symbols are given: symbol 1 and symbol 2. The CP of symbol 1 refers to a loop structure formed by copying a symbol component from the position where the CP is intercepted to the end position of symbol 1 and adding it to the front of symbol 1 (such as Figure 4 CP 1 in symbol 2). The CP of symbol 2 refers to a loop structure formed by copying a segment of symbol components between the position where the CP is cut and the end position in symbol 2 and adding them to the front of symbol 2 (such as Figure 4 CP 2 in symbol 2). The CP of symbol 2 is used as the protection interval between symbol 1 and symbol 2, and the CP of symbol 1 is used as the protection interval between symbol 1 and the symbol before it ( Figure 4 not shown).

[0121] Exemplarily, when the length of the CP of a symbol is greater than the maximum delay spread of the channel, the linear convolution of the channel and the transmit signal can be converted into a circular convolution of the channel and the transmit signal, thereby avoiding the generation of ISI.

[0122] Exemplarily, the above symbols may include OFDM symbols, DFT-s-OFDM symbols, SC-QAM symbols, etc.

[0123] A DFT-s-OFDM symbol represents a single carrier symbol whose waveform is a DFT-s-OFDM waveform, and the DFT-s-OFDM symbol includes a data symbol and a CP. The length of the data symbol is determined by the subcarrier spacing (SCS), that is, the length of the CP and the length of the DFT-s-OFDM symbol are determined by the SCS.

[0124] For example, the SCS, the length of the data symbol, and the length of the CP may satisfy the following formula:

[0125]

[0126]

[0127] Among them, T data Indicates the length of the data symbol (in μs), T cp Indicates CP length (in μs), s data Indicates the number of sampling points corresponding to the length of the data symbol, s cp Indicates the number of sampling points corresponding to the length of CP. From the above formula, it can be seen that the larger the SCS is, the shorter the length of CP is.

[0128] Figure 5 A schematic diagram of a DFT-s-OFDM symbol generation process provided in an embodiment of the present application. Figure 5 As shown, the transmitter first modulates the encoded bit stream to obtain modulation symbols (modulation methods include pi / 2-binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64QAM, 256QAM, etc.); the transmitter groups the modulation symbols according to scheduling parameters such as bandwidth, that is, the modulation symbols are converted into serial (sequential) and parallel (parallel) (S / P). The grouped modulation symbols are first subjected to discrete Fourier transformation (DFT) (or frequency domain precoding), and then subcarrier mapping is performed; after subcarrier mapping, the transmitter will perform inverse fast Fourier transform (IFFT) and add CP operations. The transmitter performs serial-to-parallel conversion (P / S) on the signal after adding CP to obtain DFT-s-OFDM symbols.

[0129] Figure 6 A schematic diagram of a SC-QAM symbol generation process provided in an embodiment of the present application. Figure 6 As shown, the transmitter first modulates the coded bit stream to obtain modulation symbols, and performs parallel-to-serial conversion (S / P) on the modulation symbols. Then, the transmitter performs a CP addition operation on the grouped modulation symbols, as well as up-sampling and filtering operations to obtain SC-QAM symbols.

[0130] 3. Timing advance (TA)

[0131] During the uplink transmission process, since the distances from different terminal devices to the network device are different, the time difference between the signals sent by different terminal devices and arriving at the network device is also different. When the terminal device receives the downlink signal sent by the network device and then sends the uplink signal, it will arrive at the network device at different times. In order to ensure the orthogonality of the uplink transmission and avoid intra-cell interference, the network device requires that the time at which the signals from different terminals in the same subframe but different frequency domain resources arrive at the network device is basically aligned. For example, the arrival time difference of the uplink signals sent by different terminal devices is within the CP range, so that the network device can correctly receive the uplink data sent by the terminal. Therefore, the uplink transmission of the terminal device needs to be timed in advance, and TA is the difference between the start time of receiving the downlink subframe (that is, the arrival time of the downlink subframe) and the time of transmitting the uplink subframe (the uplink subframe sending time).

[0132] If the terminal device sends an uplink signal after receiving a downlink signal, the network device will not be able to receive the uplink signal within the expected time, causing the uplink timing of the terminal device and the network device to be out of sync. Fig. 7A As shown in the figure, the network device sends a downlink signal at time T0, the terminal device receives the downlink signal and sends an uplink signal at time T1, and the network device receives the uplink signal at time T2, that is, the network device can no longer receive the uplink signal at the expected time (time T0), making the uplink timing of the network device and the terminal device asynchronous. Therefore, the terminal device needs to advance the timing when sending the uplink signal, for example, TA = 2*D 1 , D 1 is the transmission delay between the terminal device and the network device. Figure 7B As shown, the network device sends a downlink signal at time T0, the terminal device receives the downlink signal at time T1, the terminal device sends an uplink signal at time T3, and the network device receives the uplink signal at time T0, that is, the network device receives the uplink signal within the expected time, so that the network device and the terminal device are synchronized uplink. Among them, the time difference between time T1 and time T3 is TA = 2*D 1 .

[0133] Exemplarily, the timing advance TA satisfies the following formula:

[0134] TA=(N TA +N TA_offset )*T C (3)

[0135] Among them, N TA_offset is the fixed offset used to calculate the timing advance, T C is the time unit, N TAIt can be acquired or updated through a timing advance command (TAC) field carried by a random access response (RAR) or a media access control (MAC) control element (CE).

[0136] The N TA_offset It can be configured by the n-TimingAdvanceOffset of the serving cell. TA_offset The value of can be 0, 25600, 39936, or 13792, and the unit is Tc. For example, Tc is 0.5 nanoseconds. If the serving cell does not configure n-TimingAdvanceOffset signaling for the terminal device, N TA_offset Refer to Table 7.1.2-2 in Protocol 38.133 for the value.

[0137] See also Figure 8 , Figure 8 A schematic diagram of the structure of an OFDM symbol provided in an embodiment of the present application. Figure 8 As shown, the length of the fast Fourier transform (FFT) receiving window corresponding to each OFDM symbol is the length of the data symbol of one OFDM symbol, and the starting position of the FFT receiving window corresponding to each OFDM symbol is determined according to the ending position of the CP. Exemplarily, the starting position of the FFT receiving window corresponding to the first OFDM symbol is the ending position of the CP corresponding to the first OFDM symbol in the received signal corresponding to the first transmission path. The starting position of the FFT receiving window corresponding to the second OFDM symbol is the ending position of the CP corresponding to the second OFDM symbol in the received signal corresponding to the first transmission path.

[0138] Exemplarily, the first OFDM symbol is transmitted via a first transmission path and a second transmission path. When the transmission delay difference (i.e., delay extension) between the first transmission path and the second transmission path is greater than the length of the CP (i.e., the first CP) of the first OFDM symbol, the received signal corresponding to the second transmission path cannot completely fall into the FFT receiving window determined in the above manner. The first transmission path and the second transmission path are two different transmission paths among multiple transmission paths of the channel. Specifically, for the first OFDM symbol, a portion of the signal that reaches the receiving end via the second transmission path will be lost (e.g., Figure 8), where the part of the signal shown by the diagonal square does not fall into the FFT receiving window corresponding to the first OFDM symbol, and the part of the signal is not copied before the starting position of the first OFDM symbol. Therefore, the part of the signal is a lost useful signal, which will reduce the demodulation performance and affect the coverage. In addition, when the first OFDM symbol is the OFDM symbol where the DMRS is located, the estimation accuracy of the channel estimated based on the DMRS will be reduced.

[0139] In view of this, the embodiment of the present application provides a symbol processing method, which can reduce signal loss and inter-symbol interference, thereby improving demodulation performance. Figure 1A or Figure 1B The communication system shown, or the method is applied to a first communication device and a second communication device, the first communication device may be the terminal device or the network device described above, and the second communication device may be the network device or the terminal device described above.

[0140] It is understandable that, although the method shown below does not involve a relay node, those skilled in the art can know that when a sender and a receiver communicate, a forwarding operation can be performed through a relay node.

[0141] It can be understood that the interaction diagram in this application uses the network device and the terminal device as the execution subject of the interaction diagram as an example to illustrate the method, but this application does not limit the execution subject of the interaction diagram. For example, the network device in the interaction diagram can also be a chip, a chip system, or a processor that supports the network device to implement the method, or a logical node, a logical module, or software that can implement all or part of the network device functions; the terminal device in the interaction diagram can also be a chip, a chip system, or a processor that supports the terminal to implement the method.

[0142] See also Fig. 9 , Fig. 9 The following is an interactive diagram of a communication method provided in an embodiment of the present application. Fig. 9 As shown, the method includes but is not limited to the following steps.

[0143] 901. A first communication device generates a first time slot, wherein the first time slot includes multiple OFDM symbols, wherein the multiple OFDM symbols include a first OFDM symbol and a second OFDM symbol, wherein the first OFDM symbol is the first OFDM symbol among the multiple OFDM symbols, wherein the first OFDM symbol includes a first CP, wherein the second OFDM symbol includes a second CP, wherein the length of the first CP is greater than the length of the second CP, wherein the length of the first CP is greater than a first value, and the first value corresponds to a subcarrier spacing.

[0144] Exemplarily, the length of the first CP may include the number of modulation symbols corresponding to the first CP or the number of sampling points corresponding to the first CP or the duration of the first CP. The length of the first CP is greater than the length of the second CP, that is, the number of modulation symbols corresponding to the first CP is greater than the number of modulation symbols corresponding to the second CP, or the number of sampling points corresponding to the first CP is greater than the number of sampling points corresponding to the second CP, or the duration of the first CP is greater than the duration of the second CP.

[0145] The multiple OFDM symbols are used to carry a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH), that is, the first OFDM symbol is the first OFDM symbol among the multiple OFDM symbols used to carry PDSCH or PUSCH in the first time slot.

[0146] Exemplarily, the first value may be the length of the CP specified in the existing protocol. The first value corresponds to the subcarrier spacing, that is, the first value has different values ​​under different subcarrier spacings. For example, the correspondence between the first value and the subcarrier spacing may be as shown in Table 1. As shown in Table 1, when the SCS is 120 kilohertz (kHz), the first value may be 586 nanoseconds (ns). When the SCS is 480kHz, the first value may be 146ns.

[0147] Table 1

[0148] SCS(kHz) First value (ns) 120 ～586 480 ～146 960 ～73 1920 ～37

[0149] It can be understood that the mapping relationship between the subcarrier spacing and the first numerical value shown in Table 1 is only an example, and the value of the first numerical value shown in Table 1 should not be understood as a limitation on the present application. The first numerical value in the embodiment of the present application may also take other values.

[0150] In a possible implementation, the first time slot is included in the first subframe, and each symbol in the first subframe may correspond to an index. The first value is related to the index of the first OFDM symbol in the first subframe. The first value may be different if the index of the first OFDM symbol in the first subframe is different. For example, the index of the first OFDM symbol in the first subframe is 0 or 7*2. μ In the case of, the first value is X1; the index of the first OFDM symbol in the first subframe is not 0 or 7*2 μ In the case of, the first value is X2. Wherein, X1 is greater than X2. For example, the difference between X1 and X2 is 16β. Wherein, β corresponds to the maximum number of subcarriers and the maximum subcarrier spacing of the transmission bandwidth.

[0151] Exemplarily, the index of the first OFDM symbol in the first subframe is 0 or 7*2 μ In the case of -μ +16β. Alternatively, the index of the first OFDM symbol in the first subframe is not equal to 0 or 7*2 μ In the case of -μ . Where μ corresponds to the subcarrier spacing configuration.

[0152] For example, β may be κ, where κ is the ratio of Ts to Tc, that is, κ=Ts / Tc=64, where Ts and Tc are both time units. Tc=1 / (Δf max ·N f ), where Δf max is the maximum subcarrier spacing of the transmission bandwidth in NR, N f The number of sampling points corresponding to the maximum number of subcarriers in the transmission bandwidth of NR, for example, Δf max =480·10 3 Hz,N f =4096. Ts = 1 / (Δf ref ·N f,ref ), =15·10 3 Hz,N f,ref =2048. Where Δf ref is the subcarrier spacing of the transmission bandwidth in LTE, N f,ref is the number of sampling points corresponding to the maximum number of subcarriers of the transmission bandwidth in LTE. It can be understood that the value of κ can also refer to the relevant description in Section 4.1 of Protocol 38.211.

[0153] It can be understood that the length of the first CP is greater than the first value, which can be understood as the number of sampling points corresponding to the first CP is greater than the number of sampling points corresponding to the first value. That is, the index of the first OFDM symbol in the first subframe is 0 or 7*2 μ In the case of , the number of sampling points corresponding to the first CP is greater than 144*2 -μ +16; the index of the first OFDM symbol in the first subframe is not 0 or 7*2 μ In the case of the first CP, the number of sampling points corresponding to the first CP is greater than 144*2 -μ .

[0154] Exemplarily, the duration corresponding to the first value can be determined by the value of the first value. For example, the duration corresponding to the first value is expressed as the product of the value of the first value and Tc. The length of the first CP is greater than the first value, which can be understood as the duration of the first CP is greater than the duration corresponding to the first value. That is, the index of the first OFDM symbol in the first subframe is 0 or 7*2 μIn the case of the first CP, the duration is greater than (144κ*2 -μ +16κ)*Tc; the index of the first OFDM symbol in the first subframe is not 0 or 7*2 μ In the case of the first CP, the duration is greater than 144κ*2 -μ *Tc.

[0155] Exemplarily, the length of the second CP may be specified by the protocol. For example, the index of the second OFDM symbol in the first subframe is 7*2 μ In the case of -μ +16κ)*Tc; the index of the second OFDM symbol in the first subframe is not 0 or 7*2 μ In this case, the duration of the second CP is equal to 144κ*2 -μ *Tc.

[0156] In some possible implementations, the length of the first CP corresponds to the delay spread of the first channel, the delay spread indicates the difference in transmission delay of the first time slot in the first transmission path and the second transmission path of the first channel, and the first channel carries the first time slot. When the first time slot is transmitted through the first channel, it can be transmitted by multiple transmission paths of the first channel, and the first transmission path and the second transmission path are two different transmission paths among the multiple transmission paths. The delay spread of the first channel is the difference in transmission delay between the first transmission path and the second transmission path, that is, the delay spread of the first channel is the arrival time difference between the first transmission path and the second transmission path.

[0157] In this implementation, the length of the first CP may be determined by the delay spread of the first channel. For example, the length of the first CP is greater than or equal to the delay spread, so that the first OFDM symbol can be completely received by the corresponding FFT receiving window, avoiding signal loss and inter-symbol interference. Fig.10 As shown, for the second transmission path, part of the signal of the first OFDM symbol is after the first FFT receiving window, but the part of the signal is copied to the first CP, so the part of the signal is not lost, that is, the first OFDM symbol transmitted on the second transmission path can be completely received by the first FFT receiving window. And no other OFDM symbols will be received in the first FFT receiving window, avoiding inter-symbol interference.

[0158] Exemplarily, the first transmission path is the first transmission path to arrive among the multiple transmission paths of the first channel, and the second transmission path is the last transmission path to arrive among the multiple transmission paths, and the delay spread may also be referred to as the maximum delay spread. The length of the first CP is greater than or equal to the maximum delay spread of the first channel, so that the first OFDM symbol can be completely received by the corresponding receiving window, avoiding signal loss and inter-symbol interference, thereby improving demodulation performance and enhancing coverage.

[0159] In a possible implementation manner, the length of the first CP is determined by delay spread and at least one of a modulation and coding scheme (MCS), a code rate, and a modulation mode.

[0160] Exemplarily, different MCS or modulation modes have different error vector magnitude (EVM) requirements. For example, in high-order modulation modes or large MCS or large code rates, a smaller EVM indicator needs to be met to ensure the accuracy of demodulation. In low-order modulation modes or small MCS or small code rates, a larger EVM can also meet the accuracy of demodulation. The impact of the loss of the first symbol part of the received signal under high-order modulation or large MCS or large code rate on the demodulation performance is greater than that under low-order modulation or small MCS or small code rate. Therefore, after determining the length of the first CP according to the delay spread of the channel, the length of the first CP can also be adjusted according to the modulation mode or MCS or code rate to meet the demodulation performance. For example, the length of the first CP is positively correlated with the MCS; or, the length of the first CP is positively correlated with the modulation order corresponding to the modulation mode; or, the length of the first CP is positively correlated with the code rate.

[0161] It can be understood that the MCS in the embodiment of the present application may refer to the index of the MCS. A large MCS means that the index of the MCS is relatively large.

[0162] 902, a first communication device sends a first time slot, and correspondingly, a second communication device receives the first time slot.

[0163] In one possible implementation, the end position of the first OFDM symbol is the same as the starting position of the second OFDM symbol, and the first symbol component in the first OFDM symbol is the same as the second symbol component in the second OFDM symbol, wherein the end position of the first symbol component is the end position of the first OFDM symbol, the second symbol component is located before the third symbol component in the second OFDM symbol, the end position of the third symbol component is the same as the end position of the second OFDM symbol, the length of the third symbol component is less than or equal to the length of the second CP, and the second CP is obtained by the third symbol component.

[0164] As an example, Fig.11AAs shown, the second CP can be obtained by copying the third symbol component, that is, the second CP is the same as the third symbol component. The end position of the first OFDM symbol is the same as the start position of the second OFDM symbol, that is, the first OFDM symbol and the second OFDM symbol are continuous in the time domain, and the first OFDM symbol is before the second OFDM symbol. The end position of the first symbol component in the first OFDM symbol is the same as the start position of the second CP. Since the first symbol component is the same as the second symbol component, the second CP is the same as the third symbol component, and the symbol component composed of the first symbol component and the second CP is the same as the symbol component composed of the second symbol component and the third symbol component, the symbol component composed of the first symbol component and the second CP can be regarded as an equivalent CP of the second symbol, and the equivalent CP length of the second OFDM symbol is the sum of the length of the second CP and the length of the first symbol component.

[0165] As another example, Fig. 11B As shown, the fourth symbol component in the first OFDM symbol is the same as the fifth symbol component in the second OFDM symbol, the starting position of the fourth symbol component is the same as the ending position of the first CP, the ending position of the second symbol component is the same as the starting position of the fifth symbol component, the ending position of the fifth symbol component is the same as the starting position of the third symbol component, and the sum of the lengths of the fifth symbol component and the third symbol component is equal to the length of the second CP. In this example, the second CP is obtained by copying the fifth symbol component and the third symbol component. The symbol component composed of the first symbol component and the second CP is the same as the symbol component composed of the second symbol component, the fifth symbol component and the third symbol component, so the symbol component composed of the first symbol component and the second CP can be used as the equivalent CP of the second OFDM.

[0166] In this implementation, the first symbol component and the second CP can be understood as the CP of the second OFDM symbol, that is, the first symbol component and the second CP constitute an equivalent CP of the second OFDM symbol, thereby achieving an equivalent extension of the CP of the second OFDM symbol, thereby ensuring that the second OFDM symbol can be completely received by its corresponding receiving window, avoiding signal loss, and making the single-carrier signal have a stronger anti-ISI capability and a low adjacent channel leakage ratio (ACLR).

[0167] In the embodiment of the present application, two symbol components being the same (e.g., the first symbol component and the second symbol component, or the fourth symbol component and the fifth symbol component) may include: the two symbol components contain the same content, and the two symbol components have the same time length. The two symbol components contain the same content, which can be understood as that, before performing DFT, the modulation symbols corresponding to the two components are the same.

[0168] It is understandable that the two symbol components in the embodiment of the present application are not necessarily identical in an absolute sense, but may also be approximately identical. For example, due to the filter tailing effect, there may be a slight deviation between the two symbol components.

[0169] 903. The second communication device parses the first time slot.

[0170] In a possible implementation, in a multi-transmission reception point (TRP) scenario, the second communication device receives subframes from the first communication device and the third communication device. In this scenario, the length of the first CP is greater than or equal to the first delay difference, the first delay difference is the difference between the first transmission delay and the second transmission delay, the first transmission delay is the transmission delay of the signal from the first communication device to the second communication device, and the second transmission delay is the transmission delay of the signal from the third communication device to the second communication device.

[0171] Exemplarily, the first communication device may be a terminal device or a network device. When the first communication device is a terminal device, the first communication device may receive configuration information sent by the network device, and the configuration information is used to configure the length of the first CP. When the first communication device is a network device, the first communication device may determine the delay spread of the channel based on channel measurement, and determine the length of the first CP based on the delay spread of the channel.

[0172] In an embodiment of the present application, the length of the first CP can be extended, that is, more signals are copied from the tail of the first OFDM symbol to the front of the first OFDM symbol, so that the first OFDM symbol transmitted on each transmission path can fall within the corresponding FFT receiving window, thereby reducing signal loss and improving demodulation performance.

[0173] It should be noted that the symbols or OFDM symbols involved in the embodiments of the present application may refer to DFT-s-OFDM symbols, or SC-QAM symbols, or other symbols, and the embodiments of the present application are not limited to this.

[0174] See also Fig.12 , Fig.12 The interactive diagram of a communication method provided in an embodiment of the present application is shown in FIG. Figure 1A or Figure 1B The communication system shown, or the method can be applied to a terminal device or a network device, the terminal device can be the terminal device or the first communication device described above, the network device can be the network device or the second communication device described above, such as Fig.12 As shown, the method includes but is not limited to the following steps.

[0175] 1201. The network device sends first indication information, and correspondingly, the terminal device receives the first indication information, where the first indication information indicates the length of the first CP.

[0176] like Fig.11A or Fig. 11B As shown, in a possible implementation, for multiple OFDM symbols carrying PUSCH in the first time slot, part of the signal of the previous OFDM symbol can be copied to the next OFDM symbol by cross-symbol replication, so as to construct the equivalent CP of the next OFDM symbol. For example, part of the signal of the first OFDM symbol is copied to the second OFDM symbol to construct the equivalent CP length of the second OFDM symbol, thereby equivalently extending the length of the CP of the second OFDM symbol, and the equivalent CP length is greater than the delay spread, which can better resist ISI. However, in this implementation, the equivalent CP is effective from the second OFDM symbol in the multiple OFDM symbols, and the equivalent CP of the first OFDM symbol in the multiple OFDM symbols cannot be constructed. Therefore, the embodiment of the present application can extend the CP length of the first OFDM symbol (i.e., the first OFDM symbol) in the multiple OFDM symbols, so that the length of the CP of the first OFDM symbol is greater than or equal to the delay spread, so that the first OFDM symbol can be completely received.

[0177] Exemplarily, the first CP is the CP of the first OFDM symbol, and the first OFDM symbol is the first OFDM symbol among multiple OFDM symbols carrying PUSCH in the first time slot. The network device can indicate the length of the first CP through the first indication information to instruct the terminal device to extend the length of the CP of the first OFDM symbol. For example, the first indication information includes at least one of the following: the number of modulation symbols corresponding to the extension amount of the first CP, the number of sampling points corresponding to the extension amount of the first CP, the number of modulation symbols corresponding to the first CP, and the number of sampling points corresponding to the first CP. It can be understood that the extension amount of the first CP is the difference between the length of the first CP after extension and the length of the first CP before extension.

[0178] Exemplarily, the first indication information is carried by any one of the following: downlink control information, radio resource control signaling, MAC CE, system message SIB, and PDSCH.

[0179] Exemplarily, before the network device sends the first indication information, the terminal device may report the terminal capabilities to the network device, for example, whether the terminal device supports the extension operation of the first symbol CP and the extension amount of the CP supported by the terminal device or the length of the extended CP. If the terminal device supports the extension operation of the first symbol CP, the network device sends the first indication information. If the terminal device does not support the extension operation of the first symbol CP, the network device does not send the first indication information.

[0180] It can be understood that the specific description of the first CP and the first OFDM symbol can be referred to Fig. 9 The relevant description in step 901 will not be described in detail here.

[0181] In a possible implementation, the network device may store multiple optional first CP lengths, and indicate one or more of the multiple first CP lengths through the first indication information. In this example, the network device may pre-configure one or more first CP lengths for the terminal device to improve configuration efficiency.

[0182] In one possible implementation, the network device determines the length of the first CP based on the delay spread of the first channel, which carries the first time slot. When the delay spread of the channel is greater than the first CP, it will cause part of the received signal of the first OFDM symbol to be lost, that is, the delay spread of the channel will directly affect whether the received signal of the first OFDM symbol is complete. Therefore, the length of the first CP is directly related to the channel. In this example, the network device can first determine the channel that carries the first time slot, and then configure the length of the first CP according to the delay spread of the channel to directly avoid the loss of part of the received signal of the first symbol under the channel.

[0183] In another possible implementation, the network device determines the length of the first CP based on the delay spread of the channel and at least one of the MCS, modulation mode, and code rate. Exemplarily, the network device can preconfigure the length of the first CP based on the delay spread of the channel, and then adjust the length of the first CP through the MCS, modulation mode, code rate, etc.

[0184] As an example, the network device configures the length of the first CP or the extension amount of the first CP through MCS or modulation mode. For example, the network device can configure the length of the first CP or the extension amount of the first CP based on the mapping relationship between the length of the first CP or the extension amount of the first CP and the MCS or modulation mode or code rate, and the terminal device can determine the length of the first CP or the extension amount of the first CP based on the mapping relationship and the MCS or modulation mode or code rate corresponding to the first time slot. The above-mentioned first indication information indicates the mapping relationship between the length of the first CP or the extension amount of the first CP and the MCS or modulation mode or code rate.

[0185] For example, Table 2 shows a mapping relationship between an MCS and an extension amount (ΔK) of the first CP. As shown in Table 2, the network device can pre-configure two extension amounts of the first CP (configuration 1 and configuration 2), and then adjust the extension amount of the first CP based on the MCS. For example, for the extension amount of the first CP under configuration 1, when the index of the MCS corresponding to the first time slot belongs to range 1, the value of the extension amount of the first CP is within the range of (a1, b1); when the index of the MCS corresponding to the first time slot belongs to range 2, the value of the extension amount of the first CP is within the range of (a2, b2).

[0186] Table 2

[0187] MCS ΔK (Configuration 1) ΔK (Configuration 2) … Range 1 (a1 b1) (c1 d1) … Range 2 (a2 b2) (c2 d2) … Range 3 (a3 b3) (c3 d3) … … … … …

[0188] It can be understood that in Table 2, a1, b1, a2, b2, etc. are only used to represent different ranges of values ​​of the extension amount of the first CP. The ranges of (a1, b1) and (a2, b2) may or may not overlap, and this application does not limit this. The value range of MCS can also be replaced by the specific value of MCS, and the larger the value of MCS, the larger the corresponding extension amount of the first CP, that is, the length of the first CP is proportional to MCS. For example, when range 1 is (0,3) and range 2 is (4,6), a1 is less than a2.

[0189] It can be understood that regarding the way in which the network device configures the length of the first CP through the mapping relationship between the length of the first CP and the MCS, reference can be made to the way in which the network device configures the extension amount of the first CP through the mapping relationship between the length of the first CP and the MCS, which will not be described in detail here.

[0190] In some possible implementations, the MCS shown in Table 2 can be replaced by a code rate corresponding to the MCS, and the length of the first CP is positively correlated with the code rate corresponding to the MCS. The larger the code rate, the larger the length of the corresponding first CP or the extension amount of the first CP.

[0191] Table 3 shows a mapping relationship between a modulation mode and the extension amount (ΔK) of the first CP. As shown in Table 3, the network device can pre-configure two extension amounts of the first CP (configuration 1 and configuration 2), and then adjust the extension amount of the first CP based on the modulation mode. For example, for the extension amount of the first CP under configuration 1, when the modulation mode corresponding to the first time slot is BPSK, the value of the extension amount of the first CP is within the range of (e1, f1); when the modulation mode corresponding to the first time slot is QPSK, the value of the extension amount of the first CP is within the range of (e2, f2).

[0192] Table 3

[0193] Modulation ΔK (Configuration 1) ΔK (Configuration 2) … BPSK (e1 f1) (g1 h1) … QPSK (e2 f2) (g2 h2) … 16QAM (e3 f3) (g3 h3) … … … … …

[0194] It can be understood that in Table 3, e1, f1, e2, f2, etc. are only used to represent different ranges of values ​​of the extension amount of the first CP, and the ranges of (e1, f1) and (e2, f2) may or may not overlap, and this application does not limit this. The modulation mode in Table 3 can also be replaced by the modulation order corresponding to the modulation mode, and the larger the modulation order, the larger the corresponding extension amount of the first CP, that is, the length of the first CP is proportional to the modulation order.

[0195] It can be understood that regarding the network device configuring the length of the first CP through the mapping relationship between the length of the first CP and the modulation mode, reference can be made to the network device configuring the extension amount of the first CP through the mapping relationship between the length of the first CP and the modulation mode.

[0196] It can be understood that Table 2 and Table 3 are only a configuration method of the extension amount of the first CP provided in an embodiment of the present application, and the modulation method or the mapping relationship between the MCS and the extension amount of the first CP shown in Table 2 and Table 3 should not be understood as a limitation on the embodiment of the present application.

[0197] In this example, the network device configures a mapping relationship between the MCS or modulation mode or code rate and the extension amount of the first CP or the length of the first CP, so that the terminal device determines the length of the first CP based on the mapping relationship and the MCS or modulation mode or code rate corresponding to the first time slot to meet the EVM requirements and ensure the accuracy of demodulation.

[0198] As another example, the network device configures the length of the first CP or the extension amount of the first CP by referring to the MCS or the reference modulation mode or the reference code rate. For example, the network device may indicate the length or extension amount of the first symbol CP corresponding to the reference MCS or the reference modulation mode or the reference code rate through the first indication information. The terminal device adaptively adjusts the length of the first CP based on the length of the CP corresponding to the reference MCS or the reference modulation mode or the reference code rate. For example, when the MCS corresponding to the first time slot is greater than the reference MCS, the length of the first CP is greater than the length of the first symbol CP corresponding to the reference MCS. For another example, when the MCS corresponding to the first time slot is less than the reference MCS, the length of the first CP is less than the length of the first symbol CP corresponding to the reference MCS. For another example, when the modulation order of the modulation mode corresponding to the first time slot is less than the modulation order of the reference modulation mode, the length of the first CP is less than the length of the first symbol CP corresponding to the reference modulation mode. For another example, when the code rate corresponding to the first time slot is less than the reference code rate, the length of the first CP is less than the length of the first symbol CP corresponding to the reference code rate.

[0199] For example, as shown in Table 4, the reference MCS configured by the network device is m1. Under configuration 1, the value range of the extension amount of the first symbol CP corresponding to the reference MCS is (a1, b1). When the MCS corresponding to the first time slot is less than m1, the value range of the extension amount of the first CP is (y1, z1), where y1 is less than a1, and z1 is less than b1.

[0200] Table 4

[0201] Reference MCS ΔK (Configuration 1) ΔK (Configuration 2) … m1 (a1 b1) (c1 d1) …

[0202] In some possible implementations, the reference MCS in Table 4 may also be replaced by a code rate corresponding to the reference MCS.

[0203] As shown in Table 5, the reference modulation mode configured by the network device is QPSK. Under configuration 1, the value range of the extension amount of the first symbol CP corresponding to QPSK is (e2, f2). When the modulation order of the modulation mode corresponding to the first time slot is less than QPSK, the value range of the extension amount of the first CP is (y2, z2), where y2 is less than e2 and z2 is less than f2.

[0204] Table 5

[0205] Reference modulation ΔK (Configuration 1) ΔK (Configuration 2) … QPSK (e2 f2) (g2 h2) …

[0206] In this example, the network device can configure a mapping relationship between the reference MCS or the reference modulation mode and the extension amount of the first CP, so that the terminal device can adaptively adjust the extension amount of the first CP or the length of the first CP by comparing the reference MCS and the MCS corresponding to the first time slot to meet the EVM requirements and ensure the accuracy of demodulation.

[0207] It can be understood that the value range of the extension amount in Table 2, Table 3, Table 4, and Table 5 can also be replaced by a specific value of the extension amount, and the extension amount of the first CP can also be replaced by the length of the first CP. The extension amount of the first CP or the length of the first CP can be represented by the corresponding number of modulation symbols or the number of sampling points. The mapping relationship between the modulation mode or MCS and the extension amount of the CP shown in Table 2, Table 3, Table 4, and Table 5 is only an example, and the mapping relationship shown in Table 2, Table 3, Table 4, and Table 5 should not be understood as a limitation to the present application.

[0208] 1202. The terminal device generates a first time slot.

[0209] It is understood that the specific implementation of step 1202 can be referred to Fig. 9 The specific implementation method of step 901 will not be described in detail here.

[0210] In one possible implementation, Fig.12 The method shown also includes step 1203 .

[0211] At 12:03, the network device sends second indication information, and correspondingly, the terminal device receives the second indication information.

[0212] Exemplarily, the first time slot is included in the first subframe. The network device can indicate the time for the terminal device to send the first subframe through the second indication information to ensure uplink timing synchronization between the terminal device and the network device. For example, the first time slot is the first time slot in the first subframe. The second indication information includes at least one of the following: the first TA, the start time of the first CP, and the second difference. The first TA is used to indicate the advance time of the start time of the first subframe compared to the arrival time of the downlink subframe. The second difference is the difference between the start time of the first CP and the start time of the sixth symbol component in the first OFDM symbol. The termination position of the sixth symbol component is the termination position of the first CP, and the length of the sixth symbol component is greater than or equal to the length of the second CP. The first TA is used to indicate the TA corresponding to the first subframe after the first CP is extended. The length of the sixth symbol component is equal to the length before the first CP is extended, and the start time of the sixth symbol component can be understood as the start time of the CP before the first CP is extended. Therefore, by indicating the second difference, the start time of the first CP can be indicated. When the index of the first OFDM symbol in the first subframe is 0 or 7*2 μ in the case, the length of the sixth symbol component is greater than the length of the second CP, and the difference between the length of the sixth symbol component and the length of the second CP is 16κ. When the index of the first OFDM symbol in the first subframe is not 0 or 7*2 μ in the case, the length of the sixth symbol component is equal to the length of the second CP.

[0213] Exemplarily, the second indication information is carried in any one of the following: downlink control information, radio resource control signaling, media access control MAC control element CE, system message SIB, physical downlink shared channel PDSCH.

[0214] Exemplarily, when the second indication information indicates the first TA, the second indication information includes at least one of the following information of the first TA: the number of sampling points corresponding to the first TA, the number of modulation symbols corresponding to the first TA, the duration corresponding to the first TA, the number N of units of time corresponding to the first TA TA Regarding the N TA The corresponding relationship with the first TA can refer to formula (3). The first TA is determined by the first difference or the length of the first CP. The first difference is the difference between the length of the first CP and the length of the second CP. Alternatively, the first TA is determined by the length of the first CP or the extension amount of the first CP. The extension amount of the first CP can be represented by the first difference. For example, when the index of the first OFDM symbol in the first subframe is not 0 or 7*2 μIn the case of , the extension amount of the first CP is equal to the first difference. The index of the first OFDM symbol in the first subframe is 0 or 7*2 μ In this case, the extension amount of the first CP is equal to the difference between the first difference and 16κ.

[0215] As an example, the network device preconfigures multiple TAs and indicates one of the multiple TAs through the second indication information.

[0216] As another example, the network device may determine the first TA according to the length of the first CP or the extension amount of the first CP, and indicate the first TA through the second indication information.

[0217] Exemplarily, the network device may indicate the first TA by configuring the length of the first CP or the mapping relationship between the extension amount of the first CP and the first TA. For example, Table 6 shows a mapping relationship between the extension amount of the first CP and the first TA. As shown in Table 6, when the extension amount of the first CP is in (a1, b1), the value range of the first TA is (i1, j1).

[0218] Table 6

[0219] Extension of the first CP First TA (a1 b1) (i1 j1) (a2 b2) (i2 j2) … …

[0220] It can be understood that in Table 6, a1 and b1, a2 and b2, i1 and j1, i2 and j2 can be equal to each other or unequal, that is, the value range of the extension amount of a first CP corresponds to the value range of a first TA or the specific value of the first TA, or the specific value of the extension amount of a first CP can correspond to the value range of a first TA or the specific value of the extension amount of the first CP. The extension amount of the first CP can also be replaced by the length of the first CP. The extension amount of the first CP can be represented by the number of modulation symbols or the number of sampling points corresponding to the extension amount of the first CP, and the length of the first CP can be determined by the number of modulation symbols or the number of sampling points corresponding to the first CP. The first TA can be determined by the number of sampling points, the number of modulation symbols, the duration, and the number of unit time N corresponding to the first TA. TA .

[0221] Exemplarily, the network device can configure the mapping relationship between the extension amount of the first CP and the first TA for the terminal device through the second indication information, or the network device can determine the first TA after the first CP is extended based on the mapping relationship, and indicate the first TA through the second indication information.

[0222] As yet another example, the network device may determine the first TA according to the length of the first CP or the extension amount of the first CP and the first channel.

[0223] Exemplarily, the network device may determine the value range of the first TA according to the length of the first CP or the extension of the first CP and the first channel. The network device may indicate the value range of the first TA through the second indication information, or may determine the value of the first TA from the value range of the first TA and indicate the value of the first TA through the second indication information.

[0224] 1204. The terminal device sends a first time slot, and correspondingly, the network device receives the first time slot.

[0225] Exemplarily, the terminal device may determine the transmission time of the first time slot or the first subframe based on the second indication information.

[0226] 1205, the network device parses the first time slot.

[0227] It is understood that the specific implementation of step 1204 and step 1205 can be referred to Fig. 9 The specific implementation of step 902 and step 903 will not be described in detail here.

[0228] In the embodiment of the present application, the length of the first CP can be extended, that is, more signals are copied from the tail of the first OFDM symbol to the front of the first OFDM symbol, so that the first OFDM symbol transmitted on each transmission path can fall within the corresponding FFT receiving window to reduce signal loss, thereby improving demodulation performance. In addition, when the CP length of the first OFDM symbol changes, the network device can indicate the time when the terminal device sends the first subframe through the second indication information to ensure uplink timing synchronization between the terminal device and the network device.

[0229] In an embodiment of the present application, information such as the length of the first CP, the extension amount of the first CP, and the first TA may also be specified by the protocol. In this case, the network device does not need to send the first indication information and the second indication information to the terminal device.

[0230] Regarding the starting time of the first subframe, the embodiment of the present application also provides the following examples:

[0231] Example 1: The starting time of the first subframe is the starting time of the sixth symbol component.

[0232] In this example, the first time slot is the first time slot of the first subframe, that is, the first OFDM symbol is the first OFDM symbol of the first subframe. The sixth symbol component is the CP before the first CP extension, and the subframe start time before the first CP extension is used as the subframe start time after the first CP extension, that is, the subframe start time in the CP extension case is the same as the subframe start time in the CP extension case, such as Fig.13 shown.

[0233] Exemplarily, before the CP of the first OFDM symbol is extended, the continuous time signal corresponding to the first OFDM symbol satisfy:

[0234]

[0235]

[0236]

[0237]

[0238] Wherein, p represents the antenna port, μ represents the subcarrier spacing configuration, l represents the index of the first OFDM symbol in the first subframe, and the value range of l is: represents the number of time slots in the first subframe, represents the number of symbols in the first time slot, Indicates the starting time of the first OFDM symbol, represents the duration of the first OFDM symbol, Indicates the size of the resource grid, Indicates the number of subcarriers per resource block, represents the length of the cyclic prefix, Δf represents, μ 0 Indicates the maximum subcarrier spacing configuration, Indicates the starting index of the resource grid, Indicates the length of the data symbol.

[0239] In the case of CP extension (i.e., CP extension) of the first OFDM symbol 1, the interval before the first OFDM symbol A time-continuous signal Satisfies the following formula:

[0240]

[0241] Where t<0 represents the signal of the previous subframe, T ext Indicates the extension amount of the first CP.

[0242] The starting position of the first OFDM symbol under the subcarrier spacing configuration μ is:

[0243]

[0244] From the above, it can be seen that when the first OFDM symbol is the first OFDM symbol of the first subframe, the starting time of the first subframe when the first CP is extended is the same as the starting time of the first subframe when the first CP is not extended, that is, t=0 is taken as the subframe starting time.

[0245] In this example, the value range of the first TA includes (TA2-CP1+ΔT, TA2). Among them, CP1 is the length of the first CP, ΔT is the delay extension of the first channel, TA2 is the TA corresponding to the second subframe, the second subframe includes the second time slot, the CP length of the third OFDM symbol in the second time slot is less than the length of the first CP, and the CP length of the third OFDM symbol is greater than or equal to the length of the CP of other OFDM symbols in the second time slot, and the third OFDM symbol is the first OFDM symbol of multiple OFDM symbols in the second time slot for carrying PUSCH or PDSCH. The second subframe can be understood as the first subframe before the CP of the first OFDM symbol is extended, the third OFDM symbol can be understood as the first OFDM symbol before the first CP is extended, and the second TA can be understood as the TA corresponding to the first subframe before the first CP is extended.

[0246] Exemplarily, when the first TA takes the maximum value, it is necessary to enable the data symbol of the first OFDM symbol on the first transmission path (i.e., the path where the first transmission arrives) to be completely received by the first FFT receiving window. Fig.14A As shown, the maximum value of the first TA can be equal to the second TA. When the first TA takes the minimum value, it is necessary to enable the data symbol of the first OFDM symbol on the second transmission path (i.e., the path where the last transmission arrives) to be completely received by the first FFT receiving window. Fig. 14B As shown, the minimum value of the first TA may be smaller than the second TA. The minimum value of the first TA may be determined by the delay spread of the first channel and the length of the first CP. For example, the minimum value of the first TA may be TA2-CP1+ΔT.

[0247] Example 2: The starting time of the first subframe is the starting time of the first CP.

[0248] In this example, TA is the difference between the start time of the first subframe and the arrival time of the downlink subframe. Fig.15 As shown, since the length of the first CP becomes longer, the starting time of the first subframe moves forward, so the TA after the first CP is extended is greater than the TA before the first CP is extended.

[0249] Exemplarily, the value range of the first TA includes (TA2-CP1+ΔT+ΔD, TA2+ΔD); wherein CP1 is the length of the first CP, ΔT is the delay spread of the first channel, ΔD is the first difference or the extension amount of the first CP, TA2 is the TA corresponding to the second subframe, the second subframe includes the second time slot, the CP length of the third OFDM symbol in the second time slot is less than the length of the first CP, and the CP length of the third OFDM symbol is greater than or equal to the length of the CP of other OFDM symbols in the second time slot, and the third OFDM symbol is the first OFDM symbol of multiple OFDM symbols used to carry PUSCH or PDSCH in the second time slot. The second subframe can be understood as the first subframe before the CP of the first OFDM symbol is extended, the third OFDM symbol can be understood as the first OFDM symbol before the first CP is extended, and the second TA can be understood as the TA corresponding to the first subframe before the first CP is extended.

[0250] Exemplarily, the CP length of the first OFDM symbol is related to the index of the first OFDM symbol in the first subframe. When the index of the first OFDM symbol in the first subframe is 0, ΔD is (the first difference - 16κ), and when the index of the first OFDM symbol in the first subframe is not 0, ΔD is the first difference.

[0251] For example, Fig.16A As shown, when the first TA takes the maximum value, it is necessary to enable the first OFDM data symbol on the first transmission path to be completely received by the first FFT receiving window, and the maximum value of the first TA is increased by the extension amount of the first CP based on the second TA. Fig. 16B When the first TA takes the minimum value, it is necessary to enable the data symbol of the first OFDM symbol on the second transmission path to be completely received by the first FFT receiving window. The minimum value of the first TA can be TA2-ΔTA, where TA2 is the second TA, and ΔTA is determined by the first CP and the delay spread as well as the extension amount of the first CP. For example, ΔTA is CP1-ΔT-ΔD.

[0252] In an embodiment of the present application, the value range of the first TA can be determined based on the second TA, the length of the first CP, the first difference and the delay expansion, so that when the first TA takes the maximum value, the data symbol of the first OFDM symbol on the first transmission path (i.e., the path where the first transmission arrives) can just be completely received by the first FFT receiving window, and, when the first TA takes the minimum value, the data symbol of the first OFDM symbol on the second transmission path (i.e., the path where the last transmission arrives) can just be completely received by the first FFT receiving window, thereby ensuring that the first OFDM symbols on multiple transmission paths of the channel can all be completely received by the first FFT receiving window, avoiding signal loss.

[0253] The device provided in the embodiments of the present application is introduced below.

[0254] The present application divides the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. Figures 17 to 19 The communication device according to the embodiment of the present application is described in detail.

[0255] Fig.17 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application, such as Fig.17 As shown, the communication device includes a processing unit 1701 and a transceiver unit 1702. The transceiver unit 1702 can implement corresponding communication functions, and the processing unit 1701 is used for data processing. For example, the transceiver unit 1702 can also be called a communication interface or a communication unit.

[0256] In some embodiments of the present application, the communication device can be used to execute the actions performed by the first communication device or terminal device in the above method embodiments. In this case, the communication device can be the first communication device or terminal device, or the communication device can be a component that can be configured in the first communication device or terminal device (such as a chip or system, etc.), and the transceiver unit 1702 is used to execute the transceiver-related operations of the first communication device or terminal device in the above method embodiments, and the processing unit 1701 is used to execute the processing-related operations of the first communication device or terminal device in the above method embodiments.

[0257] Exemplarily, the processing unit 1701 generates a first time slot; the transceiver unit 1702 is used to send the first time slot.

[0258] Optionally, the processing unit 1701 is further configured to determine the length of the first CP based on delay spread.

[0259] Optionally, the transceiver unit 1702 is further used to receive first indication information.

[0260] Optionally, the transceiver unit 1702 is further used to receive second indication information.

[0261] It can be understood that the specific description of the first time slot, delay extension, first CP, first indication information, second indication information, etc. can refer to the method embodiment shown above, and will not be described in detail here.

[0262] In other embodiments of the present application, the communication device can be used to execute the actions performed by the second communication device or network device in the above method embodiments. In this case, the communication device can be a second communication device or network device, or the communication device can be or can be configured as a component (such as a chip or system, etc.) of the second communication device or network device, and the transceiver unit 1702 is used to execute the transceiver-related operations of the second communication device or network device in the above method embodiments, and the processing unit 1701 is used to execute the processing-related operations of the second communication device or network device in the above method embodiments.

[0263] Exemplarily, the transceiver unit 1702 is used to receive the first time slot; the processing unit 1701 is used to parse the first time slot.

[0264] Optionally, the transceiver unit 1702 is also used to send the first indication information.

[0265] Optionally, the transceiver unit 1702 is also used to send second indication information.

[0266] It can be understood that the specific description of the first time slot, the first indication information, the second indication information, etc. can be referred to the method embodiment shown above, and will not be described in detail here.

[0267] Optionally, the above-mentioned communication device may further include a storage unit, which may be used to store instructions and / or data, and the processing unit 1701 may read the instructions and / or data in the storage unit so that the communication device implements the above-mentioned method embodiment.

[0268] It can be understood that the specific description of the transceiver unit and the processing unit shown in the embodiment of the present application is only an example. For the specific functions or execution steps of the transceiver unit and the processing unit, reference can be made to the above-mentioned method embodiment, which will not be described in detail here.

[0269] The above describes the communication device of the embodiment of the present application, and the following describes possible product forms of the communication device. Fig.17 Any form of product with the functions of the communication device described above falls within the protection scope of the embodiments of the present application. It should also be understood that the following description is only an example and does not limit the product form of the communication device of the embodiments of the present application to this.

[0270] In one possible implementation, Fig.17In the communication device shown, the processing unit 1701 may be one or more processors, the transceiver unit 1702 may be a transceiver, or the transceiver unit 1702 may also be a sending unit and a receiving unit, the sending unit may be a transmitter, the receiving unit may be a receiver, and the sending unit and the receiving unit are integrated into one device, such as a transceiver. In the embodiment of the present application, the processor and the transceiver may be coupled, etc., and the embodiment of the present application does not limit the connection mode of the processor and the transceiver. In the process of executing the above method, the process of sending information in the above method can be understood as the process of outputting the above information by the processor. When outputting the above information, the processor outputs the above information to the transceiver so that it is transmitted by the transceiver. After the above information is output by the processor, it may also need to be processed in other ways before it reaches the transceiver. Similarly, the process of receiving information in the above method can be understood as the process of the processor receiving the input information. When the processor receives the input information, the transceiver receives the above information and inputs it into the processor. Furthermore, after the transceiver receives the above information, the above information may need to be processed in other ways before it is received by the processor.

[0271] like Fig.18 As shown, the communication device 180 includes one or more processors 1820 and a transceiver 1810 .

[0272] In some embodiments of the present application, the communication device can be used to execute the steps or functions performed by the first communication device or terminal equipment in the above method embodiments.

[0273] Exemplarily, the processor 1820 is used to generate a first time slot; and the transceiver 1810 is used to send the first time slot.

[0274] Optionally, the transceiver 1810 is also used to receive first indication information.

[0275] Optionally, the transceiver 1810 is further used to receive second indication information.

[0276] Optionally, processor 1820 is further configured to determine a length of the first CP based on delay spread.

[0277] In some other embodiments of the present application, the communication device can be used to execute the steps or functions performed by the second communication device or network equipment in the above method embodiments.

[0278] Exemplarily, the transceiver 1810 is used to receive a first time slot; and the processor 1820 is used to parse the first time slot.

[0279] Optionally, the transceiver 1810 is also used to send the first indication information.

[0280] Optionally, the transceiver 1810 is also used to send second indication information.

[0281] It can be understood that the specific description of the transceiver and the processor shown in the embodiments of the present application is only an example. For the specific functions or execution steps of the transceiver and the processor, reference can be made to the above-mentioned method embodiments, which will not be described in detail here.

[0282] In the above embodiments, the description of the first time slot, delay extension, first CP, first indication information, second indication information, etc. can also refer to the introduction in the above method embodiment, and will not be described in detail here.

[0283] exist Fig.18 In various implementations of the communication device shown, the transceiver may include a receiver and a transmitter, wherein the receiver is used to perform a receiving function (or operation) and the transmitter is used to perform a transmitting function (or operation). The transceiver is used to communicate with other devices / devices through a transmission medium.

[0284] Optionally, the communication device 180 may also include one or more memories 1830 for storing program instructions and / or data, etc. The memory 1830 is coupled to the processor 1820. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1820 may operate in conjunction with the memory 1830. The processor 1820 may execute program instructions stored in the memory 1830. Optionally, at least one of the one or more memories may be included in the processor.

[0285] The specific connection medium between the transceiver 1810, the processor 1820 and the memory 1830 is not limited in the embodiment of the present application. Fig.18 In the embodiment, the memory 1830, the processor 1820 and the transceiver 1810 are connected via a bus 1840. Fig.18 The connections between the other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.18 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0286] In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor, etc.

[0287] In the embodiment of the present application, the memory may include, but is not limited to, non-volatile memory such as a hard disk drive (HDD) or a solid-state drive (SSD), a random access memory (RAM), an erasable programmable read-only memory (EPROM), a read-only memory (ROM) or a portable read-only memory (CD-ROM), etc. The memory is any storage medium that can be used to carry or store program codes in the form of instructions or data structures and can be read and / or written by a computer (such as a communication device shown in the present application), but is not limited thereto. The memory in the embodiment of the present application can also be a circuit or any other device that can realize a storage function, for storing program instructions and / or data.

[0288] Exemplarily, the processor 1820 is mainly used to process the communication protocol and communication data, and to control the entire communication device, execute the software program, and process the data of the software program. The memory 1830 is mainly used to store the software program and data. The transceiver 1810 may include a control circuit and an antenna. The control circuit is mainly used for converting the baseband signal and the radio frequency signal and processing the radio frequency signal. The antenna is mainly used to transmit and receive radio frequency signals in the form of electromagnetic waves. The input and output devices, such as a touch screen, a display screen, a keyboard, etc., are mainly used to receive data input by the user and output data to the user.

[0289] When the communication device is turned on, the processor 1820 can read the software program in the memory 1830, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 1820 performs baseband processing on the data to be sent, and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor 1820. The processor 1820 converts the baseband signal into data and processes the data.

[0290] In another implementation, the RF circuit and antenna may be arranged independently of the processor performing baseband processing. For example, in a distributed scenario, the RF circuit and antenna may be arranged remotely from the communication device.

[0291] It is understandable that the communication device shown in the embodiment of the present application may also have Fig.18 The embodiments of the present application do not limit the number of components and the like. The methods executed by the processor and the transceiver shown above are only examples, and the specific steps executed by the processor and the transceiver can refer to the methods described above.

[0292] In another possible implementation, Fig.17 In the communication device shown, the processing unit 1701 may be one or more logic circuits, and the transceiver unit 1702 may be an input / output interface, or a communication interface, or an interface circuit, or an interface, etc. Alternatively, the transceiver unit 1702 may be a sending unit and a receiving unit, the sending unit may be an output interface, the receiving unit may be an input interface, and the sending unit and the receiving unit may be integrated into one unit, such as an input / output interface. Fig.19 As shown, Fig.19 The communication device shown includes a logic circuit 1901 and an interface 1902. That is, the processing unit 1701 can be implemented by the logic circuit 1901, and the transceiver unit 1702 can be implemented by the interface 1902. The logic circuit 1901 can be a chip, a processing circuit, an integrated circuit or a system on chip (SoC) chip, etc., and the interface 1902 can be a communication interface, an input / output interface, a pin, etc. For example, Fig.19 The above communication device is used as an example of a chip, and the chip includes a logic circuit 1901 and an interface 1902 .

[0293] In the embodiment of the present application, the logic circuit and the interface may also be coupled to each other. The embodiment of the present application does not limit the specific connection method between the logic circuit and the interface.

[0294] In some embodiments of the present application, the communication device may be used to execute the steps or functions performed by the first communication device or terminal device in the above method embodiment. Exemplarily, the logic circuit 1901 is used to generate a first time slot; the interface 1902 is used to output the first time slot. Optionally, the logic circuit 1901 is also used to determine the length of the first CP. Optionally, the interface 1902 is also used to receive the first indication information. Optionally, the interface 1902 is also used to receive the second indication information.

[0295] In some other embodiments of the present application, the communication device can be used to execute the steps or functions performed by the second communication device or network device in the above method embodiment. Exemplarily, the interface 1902 is used to input the first time slot; the logic circuit 1901 is used to parse the first time slot. Optionally, the interface 1902 is also used to send the first indication information. Optionally, the interface 1902 is also used to send the second indication information.

[0296] It can be understood that the specific description of the logic circuit and interface shown in the embodiments of the present application is only an example. For the specific functions or execution steps of the logic circuit and interface, etc., reference can be made to the above-mentioned method embodiments and will not be described in detail here.

[0297] In the above embodiments, the description of the first time slot, delay extension, first CP, first indication information, second indication information, etc. can also refer to the introduction in the above method embodiment, and will not be described in detail here.

[0298] It can be understood that the communication device shown in the embodiment of the present application can implement the method provided in the embodiment of the present application in the form of hardware, or can implement the method provided in the embodiment of the present application in the form of software, etc., and the embodiment of the present application is not limited to this.

[0299] An embodiment of the present application further provides a communication system, which includes a first communication device and a second communication device, and the first communication device and the second communication device are used to execute the method in any of the aforementioned embodiments.

[0300] An embodiment of the present application also provides a communication system, which includes a terminal device and a network device, and the terminal device and the network device are used to execute the method in any of the aforementioned embodiments.

[0301] In addition, the present application also provides a computer program, which is used to implement the operations and / or processing performed by the first communication device or terminal equipment in the method provided by the present application.

[0302] The present application also provides a computer program, which is used to implement the operations and / or processing performed by the second communication device or network equipment in the method provided by the present application.

[0303] The present application also provides a computer-readable storage medium, which stores computer code. When the computer code runs on a computer, the computer executes the operations and / or processing performed by the first communication device or terminal equipment in the method provided by the present application.

[0304] The present application also provides a computer-readable storage medium, in which computer code is stored. When the computer code is executed on a computer, the computer executes the operations and / or processing performed by the second communication device or network equipment in the method provided by the present application.

[0305] The present application also provides a computer program product, which includes a computer code or a computer program. When the computer code or computer program runs on a computer, the operations and / or processing performed by the first communication device or terminal equipment in the method provided by the present application are executed.

[0306] The present application also provides a computer program product, which includes a computer code or a computer program. When the computer code or the computer program runs on a computer, the operations and / or processing performed by the second communication device or the network device in the method provided by the present application are executed.

[0307] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

[0308] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the technical effects of the solutions provided in the embodiments of the present application.

[0309] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0310] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or partly contributed to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned readable storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., and other media that can store program codes.

[0311] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A symbol processing method, It is characterized in that Applied to a first communication device, comprising: Generate a first time slot, the first time slot includes a plurality of orthogonal frequency division multiplexing OFDM symbols, the plurality of OFDM symbols include a first OFDM symbol and a second OFDM symbol, the first OFDM symbol is the first OFDM symbol of the plurality of OFDM symbols, the first OFDM symbol includes a first cyclic prefix CP, the second OFDM symbol includes a second CP, the length of the first CP is greater than the length of the second CP, the length of the first CP is greater than a first value, and the first value corresponds to a subcarrier spacing; The first time slot is transmitted.

2. The method according to claim 1, It is characterized in that The first communication device is a network device, and the method further includes: The length of the first CP is determined based on a delay spread of a first channel, where the delay spread is a difference in transmission delays of the first time slot in a first transmission path and a second transmission path of the first channel, and the first channel carries the first time slot.

3. The method according to claim 1, It is characterized in that The first communication device is a terminal device, and the method further includes: First indication information is received, where the first indication information indicates a length of the first CP.

4. The method according to claim 3, It is characterized in that The first indication information is carried in any one of the following items: downlink control information, radio resource control signaling, media access control MAC control element CE, system message SIB, and physical downlink shared channel PDSCH.

5. The method according to claim 1, 3 or 4, It is characterized in that The first communication device is a terminal device, the first time slot is included in a first subframe, and the method further includes: Receive second indication information, where the second indication information includes at least one of the following: a first timing advance TA, a start time of the first CP, and a second difference, wherein the first TA is used to indicate the advance time of the start time of the first subframe compared to the arrival time of the downlink subframe, and the second difference is the difference between the start time of the first CP and the start time of the sixth symbol component in the first OFDM symbol, the end position of the sixth symbol component is the end position of the first CP, and the length of the sixth symbol component is greater than or equal to the length of the second CP; The sending the first time slot includes: The first subframe is sent based on the second indication information.

6. A method for symbol processing, It is characterized in that Applied to a second communication device, comprising: Receive a first time slot, the first time slot includes a plurality of orthogonal frequency division multiplexing OFDM symbols, the plurality of OFDM symbols include a first OFDM symbol and a second OFDM symbol, the first OFDM symbol is the first OFDM symbol of the plurality of OFDM symbols, the first OFDM symbol includes a first cyclic prefix CP, the second OFDM symbol includes a second CP, the length of the first CP is greater than the length of the second CP, the length of the first CP is greater than a first value, and the first value corresponds to a subcarrier spacing; The first time slot is parsed.

7. The method according to claim 6, It is characterized in that The second communication device is a network device, the first time slot is included in a first subframe, and the method further includes: Send second indication information, the second indication information including at least one of the following: a first timing advance TA, a start time of the first CP, and a second difference, wherein the first TA is used to indicate the advance time of the start time of the first subframe compared to the arrival time of the downlink subframe, the second difference is the difference between the start time of the first CP and the start time of the sixth symbol component in the first OFDM symbol, the end position of the sixth symbol component is the end position of the first CP, and the length of the sixth symbol component is greater than or equal to the length of the second CP.

8. The method according to claim 5 or 7, It is characterized in that The second indication information includes the first TA, where the first TA is determined by a first difference or a length of the first CP, and the first difference is a difference between a length of the first CP and a length of the second CP.

9. The method according to claim 5, 7 or 8, It is characterized in that The starting time of the first subframe is the starting time of the sixth symbol component.

10. The method according to claim 9, It is characterized in that The value range of the first TA includes (TA2-CP1+ΔT, TA2); wherein the CP1 is the length of the first CP, the ΔT is the delay extension of the first channel carrying the first subframe, the TA2 is the TA corresponding to the second subframe, the second subframe includes a second time slot, the CP length of the third OFDM symbol in the second time slot is less than the length of the first CP, and the CP length of the third OFDM symbol is greater than or equal to the length of the CP of other OFDM symbols in the second time slot, and the third OFDM symbol is the first OFDM symbol among multiple OFDM symbols in the second time slot for carrying PUSCH or PDSCH.

11. The method according to claim 5, 7 or 8, It is characterized in that The starting time of the first subframe is the starting time of the first CP.

12. The method according to claim 11, It is characterized in that The value range of the first TA includes (TA2-CP1+ΔT+ΔD, TA2+ΔD); wherein the CP1 is the length of the first CP, the ΔT is the delay extension of the first channel carrying the first subframe, the ΔD is the first difference, the TA2 is the TA corresponding to the second subframe, the second subframe includes a second time slot, the CP length of the third OFDM symbol in the second time slot is less than the length of the first CP, and the CP length of the third OFDM symbol is greater than or equal to the length of the CP of other OFDM symbols in the second time slot, and the third OFDM symbol is the first OFDM symbol among multiple OFDM symbols in the second time slot for carrying PUSCH or PDSCH.

13. The method according to any one of claims 5, 7 to 12, It is characterized in that The second indication information includes at least one of the following information of the first TA: the number of sampling points corresponding to the first TA, the number of modulation symbols corresponding to the first TA, the duration corresponding to the first TA, and the number of unit times corresponding to the first TA.

14. The method according to any one of claims 5, 7 to 13, It is characterized in that The second indication information is carried in any one of the following items: downlink control information, radio resource control signaling, media access control MAC control element CE, system message SIB, and physical downlink shared channel PDSCH.

15. The method according to any one of claims 1 to 14, It is characterized in that The index of the first OFDM symbol in the first subframe is 0 or 7*2 μ In the case of -μ +16β); or, The index of the first OFDM symbol in the first subframe is not equal to 0 or 7*2 μ In the case where the first value is equal to 144β*2 -μ ; The first subframe includes the first time slot, the β corresponds to the maximum number of subcarriers and the maximum subcarrier spacing of the transmission bandwidth, and the μ corresponds to the subcarrier spacing configuration.

16. The method according to any one of claims 1 to 15, It is characterized in that The length of the first CP corresponds to a delay spread of a first channel, where the delay spread is a difference in transmission delays of the first time slot in a first transmission path and a second transmission path of the first channel, and the first channel carries the first time slot.

17. The method according to claim 16, It is characterized in that The first transmission path is a transmission path that arrives first among multiple transmission paths of the first channel, and the second transmission path is a transmission path that arrives last among the multiple transmission paths.

18. The method according to claim 16 or 17, wherein the length of the first CP is greater than or equal to the delay spread.

19. The method according to any one of claims 16 to 18, It is characterized in that The length of the first CP is determined by the delay spread and at least one of the modulation and coding strategy MCS, the modulation mode, and the code rate.

20. The method according to claim 19, It is characterized in that The length of the first CP is positively correlated with the MCS; or, The length of the first CP is positively correlated with the modulation order corresponding to the modulation mode; or, The length of the first CP is positively correlated with the code rate.

21. The method according to any one of claims 1 to 20, It is characterized in that The multiple OFDM symbols are used to carry a physical downlink shared channel PDSCH or a physical uplink shared channel PUSCH.

22. The method according to any one of claims 1 to 21, It is characterized in that The end position of the first OFDM symbol is the same as the starting position of the second OFDM symbol, and the first symbol component in the first OFDM symbol is the same as the second symbol component in the second OFDM symbol, wherein the end position of the first symbol component is the end position of the first OFDM symbol, the second symbol component is located before the third symbol component in the second OFDM symbol, the end position of the third symbol component is the same as the end position of the second OFDM symbol, the length of the third symbol component is less than or equal to the length of the second CP, and the second CP is obtained by the third symbol component.

23. The method according to claim 22, It is characterized in that The fourth symbol component in the first OFDM symbol is the same as the fifth symbol component in the second OFDM symbol, the starting position of the fourth symbol component is the same as the ending position of the first CP, the ending position of the second symbol component is the same as the starting position of the fifth symbol component, the ending position of the fifth symbol component is the same as the starting position of the third symbol component, and the sum of the lengths of the fifth symbol component and the third symbol component is equal to the length of the second CP.

24. A communication device, It is characterized in that Comprising units for performing the method according to any one of claims 1 to 23.

25. A communication device, It is characterized in that including a processor and a memory; The memory is used to store instructions; The processor is configured to execute the instructions so that the method according to any one of claims 1 to 23 is performed.

26. A communication device, It is characterized in that comprising a logic circuit and an interface, wherein the logic circuit and the interface are coupled; The interface is used to input and / or output code instructions, and the logic circuit is used to execute the code instructions so that the method described in any one of claims 1 to 23 is executed.

27. A computer-readable storage medium, It is characterized in that The computer-readable storage medium is used to store a computer program. When the computer program is executed, the method according to any one of claims 1 to 23 is executed.

28. A computer program, It is characterized in that When the computer program is executed, the method according to any one of claims 1 to 23 is performed.

29. A communication system, It is characterized in that The communication system comprises a first communication device and a second communication device, wherein the first communication device is used to execute the method according to any one of claims 1-5 and 8-23, and the second communication device is used to execute the method according to any one of claims 6-23.

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