Communication method and apparatus

Abstract

The present application provides a communication method and apparatus, for use in realizing flexible configuration of guard intervals between symbols. The method comprises: a first communication apparatus acquires a first waveform symbol, wherein an SCP of the first waveform symbol is the same as a first symbol component in the first waveform symbol, the first symbol component is located at the tail of the first waveform symbol, or the end position of the first symbol component in the first waveform symbol corresponds to a cyclic prefix (CP) interception point of the first waveform symbol; and the first communication apparatus can also output the first waveform symbol. The length of the SCP of the first waveform symbol is related to at least one of the following pieces of information: the CP length of the first waveform symbol; or the length of a delay spread; or the importance of the first waveform symbol; or a modulation and coding / decoding scheme corresponding to the first waveform symbol; or an error vector magnitude corresponding to the first waveform symbol; or the load size of data, the data comprising data carried by the first waveform symbol.

Description

Communication method and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on November 16, 2023, with application number 202311538117.0 and invention name "A Communication Method and Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of mobile communication technologies, and in particular to a communication method and device. Background Art

[0004] In wireless communication systems, the medium that propagates signals from a transmitter to a receiver is called a channel. Multipath is a propagation phenomenon that causes radio signals to travel two or more paths to the receiver. Multipath can be caused by atmospheric ducting, ionospheric reflection and refraction, or reflections from water and terrestrial objects such as mountains and buildings. Because the multiple components of a multipath signal travel different distances, they arrive at the receiver at different times, corresponding to different paths. The time difference between the arrival of the first and last components of the same signal along a path is called the maximum delay spread (DS).

[0005] Multipath signal propagation can cause inter-symbol interference (ISI) and inter-carrier interference (ICI), degrading communication performance. To mitigate ISI and ICI between symbols, a guard interval (GI) is typically inserted between symbols. However, further research is needed to flexibly configure the guard interval between symbols.

[0006] Summary of the Invention

[0007] The present application provides a communication method and apparatus for realizing flexible configuration of guard intervals between symbols to improve transmission performance.

[0008] In a first aspect, a communication method is provided. The method can be implemented by a first communication device. The first communication device can be used to send a signal. For example, the first communication device can be a terminal device or an access network device (or replaced by a network device, such as a base station). The first communication device can also be a component in the terminal device or a component in the access network device. Among them, the components in the present application may include, for example, at least one of a chip, a chip system, a processor, a transceiver, a processing unit, or a transceiver unit. Taking the execution subject as the first communication device as an example, the communication method provided in the present application may include the following steps: the first communication device obtains a first waveform symbol, the SCP of the first waveform symbol is the same as the first symbol component in the first waveform symbol; the first symbol component is located at the end of the first waveform symbol, or the end position of the first symbol component in the first waveform symbol corresponds to the cyclic prefix CP interception point of the first waveform symbol; the first communication device may also output the first waveform symbol.

[0009] The length of the SCP of the first waveform symbol is related to at least one of the following information: the CP length of the first waveform symbol; or the delay spread length; or the importance of the first waveform symbol; or the modulation and coding scheme corresponding to the first waveform symbol; or the error vector magnitude corresponding to the first waveform symbol; or the payload size of data, where the data includes the data carried by the first waveform symbol.

[0010] Based on the first aspect, the SCP of the first waveform symbol is the same as the first symbol component in the first waveform symbol, wherein the first waveform symbol is a data symbol. Therefore, the CP of the first waveform symbol can be extended by the SCP, thereby improving the demodulation performance of the first waveform symbol and improving the transmission performance. The length of the SCP is flexibly determined based on the CP length, the delay spread length, the importance of the first waveform symbol, the modulation and coding scheme corresponding to the first waveform symbol, the error vector magnitude corresponding to the first waveform symbol, or the data payload size, thereby achieving flexible extension of the CP.

[0011] In a possible implementation, the SCP of the first waveform symbol is located before the CP of the first waveform symbol, and the end position of the first symbol component in the first waveform symbol corresponds to the CP interception point of the first waveform symbol.

[0012] In one possible implementation, the first communication device may also obtain a second waveform symbol, which is the waveform symbol preceding the first waveform symbol. The first communication device may also replace the end of the second symbol component in the second waveform symbol with the SCP of the first waveform symbol, where the second symbol component is located at the end of the second waveform symbol and does not carry data. Based on this implementation, the end of the previous waveform symbol can be replaced with the SCP of the first waveform symbol, and the CP length of the first waveform symbol can be extended through forward puncturing. In addition, the second symbol component does not carry data, which reduces the degradation of the demodulation performance of the second waveform symbol caused by the puncturing operation.

[0013] In one possible implementation, the CP of the second waveform symbol includes the same signal as the second symbol component, or the CP of the second waveform symbol includes the same signal as the SCP of the first waveform symbol. Based on this implementation, forward puncturing can be performed after the CP is added to the second waveform symbol, or forward puncturing can be performed before the CP is added to the second waveform symbol. In the case where the CP is added before puncturing, the generation timing of the first and second waveform symbols is not restricted, so there is no generation delay between the waveform symbols, but the demodulation performance of the second waveform symbol is reduced. In the case where puncturing is performed before the CP is added, the generation timing of the second waveform symbol needs to be after the generation of the first waveform symbol, so there is a generation delay between the waveform symbols, but the demodulation performance of the second waveform symbol is improved.

[0014] In one possible implementation, if the first communication device is a terminal device, the first communication device may further receive first information; wherein, if the CP of the second waveform symbol includes the same signal as the second symbol component, the first information is used to indicate that the CP of the second waveform symbol is added before puncturing the second waveform symbol; if the CP of the second waveform symbol includes the same signal as the SCP of the first waveform symbol, the first information is used to indicate that the CP of the second waveform symbol is added after puncturing the second waveform symbol. Based on this implementation, the access network device can indicate to the terminal device the order in which to perform the puncturing operation and the CP addition operation.

[0015] In one possible implementation, if the first communication device is a terminal device, the first communication device may further receive second information, where the second information is used to indicate forward puncturing. Based on this implementation, the access network device may indicate the puncturing direction to the terminal device.

[0016] In one possible implementation, the first communication device may further obtain a third waveform symbol; replace a third symbol component in the third waveform symbol with a fourth symbol component, wherein the starting position of the third symbol component is the same as the starting position of the third waveform symbol, the length of the third symbol component is the same as the length of the fourth symbol component, and the fourth symbol component is the same as the end signal of the CP of the first waveform symbol. Based on this implementation, the first communication device may replace the leading symbol component of the third waveform symbol with the same symbol component as the SCP of the first waveform symbol, thereby extending the CP of the first waveform symbol through backward puncturing.

[0017] In one possible implementation, the first communications device may further replace the fifth symbol component in the third waveform symbol with the fourth symbol component. The fifth symbol component does not carry data, and the starting position of the fifth symbol component is one sampling point after the CP interception point of the third waveform symbol. Based on this implementation, the first communications device may replace the fifth symbol component in the third waveform symbol with a symbol component identical to the SCP of the first waveform symbol (i.e., the fourth symbol component). Because the fifth symbol component is identical to the fourth symbol component, puncturing can be used to extend the CP of the third waveform symbol, thereby improving demodulation performance of the third waveform symbol.

[0018] In one possible implementation, if the first communication device is a terminal device, the first communication device may further receive third information, where the third information is used to instruct the terminal device to replace the fifth symbol component with the fourth symbol component. Based on this implementation, the access network device may instruct the terminal device to replace the fifth symbol component with the fourth symbol component.

[0019] In one possible implementation, the symbol components preceding the fifth symbol component and / or following the fifth symbol component do not carry data, the symbol components preceding the fifth symbol component are continuous with the fifth symbol component, and the fifth symbol component and the symbol components following the fifth symbol component are continuous. Based on this implementation, the puncturing of the fifth symbol component can be prevented from affecting the data.

[0020] In one possible implementation, the SCP of the first waveform symbol is located after the CP of the first waveform symbol, and the SCP of the first waveform symbol is continuous with the CP of the first waveform symbol. The first symbol component is located at the end of the first waveform symbol, the CP of the first waveform symbol is the same as the second symbol component in the first waveform symbol, the second symbol component is located before the first symbol component, and the second symbol component is continuous with the first symbol component.

[0021] In one possible implementation, the first communication device may further obtain a third waveform symbol and replace a third symbol component in the third waveform symbol with the first symbol component, wherein the starting position of the third symbol component is the same as the starting position of the third waveform symbol, and the length of the third symbol component is the same as the length of the first symbol component. Based on this implementation, the end of the previous waveform symbol may be replaced with the SCP of the first waveform symbol, thereby extending the CP length of the first waveform symbol through forward puncturing.

[0022] In a possible implementation, the first communication device may also replace the fifth symbol component of the third waveform symbol with the first symbol component, where the fifth symbol component does not carry data, and the starting position of the fifth symbol component is a sampling point after the CP interception point of the third waveform symbol.

[0023] In one possible implementation, if the first communication device is a terminal device, the first communication device may further receive fourth information, where the fourth information may be used to instruct the terminal device to replace the fifth symbol component with the first symbol component. Based on this implementation, the access network device may instruct the terminal device to replace the fifth symbol component with the first symbol component.

[0024] In one possible implementation, the symbol components preceding the fifth symbol component and / or following the fifth symbol component do not carry data, the symbol components preceding the fifth symbol component are continuous with the fifth symbol component, and the fifth symbol component and the symbol components following the fifth symbol component are continuous. Based on this implementation, the puncturing of the fifth symbol component can be prevented from affecting the data.

[0025] In one possible implementation, the third waveform symbol includes a sixth symbol component, the sixth symbol component is located after the CP of the third waveform symbol, the sixth symbol component is continuous with the CP of the third waveform symbol, and the sixth symbol component does not carry data. Based on this implementation, backward puncturing can prevent the impact on demodulation performance of the punctured waveform symbol.

[0026] In one possible implementation, if the first communication device is a terminal device, the first communication device may further receive second information, where the second information is used to indicate backward puncturing. Based on this implementation, the access network device may indicate the puncturing direction to the terminal device.

[0027] In one possible implementation, if the first communication device is a terminal device, the first communication device can obtain the first waveform symbol based on first configuration information; wherein the first configuration information is used to configure at least one of the following information: the length of the SCP of the first waveform symbol; the position of the SCP of the first waveform symbol; the length of the first symbol component; and the position of the first symbol component.

[0028] In a possible implementation, the first configuration information is carried in at least one of a radio resource control (RRC) message, a medium access control control element (MAC CE), or downlink control information (DCI). For example, the access network device may configure the SCP length of the first waveform symbol to the terminal device through an RRC message or a MAC CE. In addition, the access network device may also notify the terminal device through DCI whether any waveform symbol has an SCP. Alternatively, the access network device may also configure multiple candidate SCP lengths or length ranges to the terminal device through an RRC message or a MAC CE, and then notify the terminal device through DCI whether any waveform symbol has an SCP. In addition, when an SCP exists in a waveform symbol, the access network device may also notify or indicate an SCP length from multiple candidate SCP lengths through DCI as the SCP length of the waveform symbol.

[0029] In a second aspect, a communication method is provided. The method can be implemented by a second communication device. The first communication device can be used to receive a signal. For example, the second communication device can be an access network device or a terminal device. The second communication device can also be a component in the access network device or a component in the terminal device. Taking the execution subject as the second communication device as an example, the communication method provided in this application may include the following steps: receiving a first waveform symbol, the supplementary cyclic prefix SCP of the first waveform symbol is the same as the first symbol component in the first waveform symbol; the first symbol component is located at the end of the first waveform symbol, or the end position of the first symbol component in the first waveform symbol corresponds to the cyclic prefix CP interception point of the first waveform symbol; and demodulating the first waveform symbol to obtain the data.

[0030] The length of the SCP of the first waveform symbol is related to at least one of the following information: the CP length of the first waveform symbol; or the delay spread length; or the importance of the first waveform symbol; or the modulation coding scheme MCS corresponding to the first waveform symbol; or the error vector magnitude EVM corresponding to the first waveform symbol; or the payload size of data, where the data includes the data carried by the first waveform symbol.

[0031] In a possible implementation, the SCP of the first waveform symbol is located before the CP of the first waveform symbol, and the end position of the first symbol component in the first waveform symbol corresponds to the CP interception point of the first waveform symbol.

[0032] In one possible implementation, the second communication device may further receive a second waveform symbol, where the second waveform symbol is the previous waveform symbol of the first waveform symbol, the end of the second symbol component in the second waveform symbol is replaced with the SCP of the first waveform symbol, the second symbol component is located at the end of the second waveform symbol, and the second symbol component does not carry data.

[0033] In a possible implementation manner, the CP of the second waveform symbol contains the same signal as the second symbol component, or the CP of the second waveform symbol contains the same signal as the SCP of the first waveform symbol.

[0034] In one possible implementation, if the second communication device is an access network device, the second communication device may further send first information; wherein, if the CP of the second waveform symbol contains the same signal as the second symbol component, the first information is used to indicate that the CP of the second waveform symbol is added before the second waveform symbol is punctured; if the CP of the second waveform symbol contains the same signal as the SCP of the first waveform symbol, the first information is used to indicate that the CP of the second waveform symbol is added after the second waveform symbol is punctured.

[0035] In a possible implementation, if the second communication device is an access network device, the second communication device may further send second information, where the second information is used to indicate forward puncturing.

[0036] In one possible implementation, if the second communication device is an access network device, the second communication device may also receive a third waveform symbol, wherein the third symbol component in the third waveform symbol is replaced by a fourth symbol component, the starting position of the third symbol component is the same as the starting position of the third waveform symbol, and the length of the third symbol component is the same as the length of the fourth symbol component, and the fourth symbol component is the same as the end signal of the CP of the first waveform symbol.

[0037] In a possible implementation, the fifth symbol component in the third waveform symbol is replaced by the fourth symbol component, the fifth symbol component does not carry data, and the starting position of the fifth symbol component is a sampling point after the CP interception point of the third waveform symbol.

[0038] In a possible implementation, if the second communication device is an access network device, the second communication device may further send first information, where the first information is used to indicate that the CP of the third waveform symbol is added after the third waveform symbol is punctured.

[0039] In one possible implementation, the symbol component before the fifth symbol component and / or the symbol component after the fifth symbol component does not carry data, the symbol component before the fifth symbol component is continuous with the fifth symbol component, and the fifth symbol component and the symbol component after the fifth symbol component are continuous.

[0040] In one possible implementation, the SCP of the first waveform symbol is located after the CP of the first waveform symbol, and the SCP of the first waveform symbol is continuous with the CP of the first waveform symbol. The first symbol component is located at the end of the first waveform symbol, the CP of the first waveform symbol is the same as the second symbol component in the first waveform symbol, the second symbol component is located before the first symbol component, and the second symbol component is continuous with the first symbol component.

[0041] In one possible implementation, if the second communication device is an access network device, the second communication device may also receive a third waveform symbol, the third symbol component in the third waveform symbol is replaced by the first symbol component, the starting position of the third symbol component is the same as the starting position of the third waveform symbol, and the length of the third symbol component is the same as the length of the first symbol component.

[0042] In a possible implementation, the fifth symbol component in the third waveform symbol is replaced by the first symbol component, the fifth symbol component does not carry data, and the starting position of the fifth symbol component is a sampling point after the CP interception point of the third waveform symbol.

[0043] In a possible implementation, if the second communication device is an access network device, the second communication device may further send first information, where the first information is used to indicate that the CP of the third waveform symbol is added after the third waveform symbol is punctured.

[0044] In one possible implementation, the symbol component before the fifth symbol component and / or the symbol component after the fifth symbol component does not carry data, the symbol component before the fifth symbol component is continuous with the fifth symbol component, and the fifth symbol component and the symbol component after the fifth symbol component are continuous.

[0045] In a possible implementation, the third waveform symbol includes a sixth symbol component, the sixth symbol component is located after the CP of the third waveform symbol, the sixth symbol component is continuous with the CP of the third waveform symbol, and the sixth symbol component does not carry data.

[0046] In a possible implementation, if the second communication device is an access network device, the second communication device may further send second information, where the second information is used to indicate backward puncturing.

[0047] In one possible implementation, if the second communication device is an access network device, the second communication device may further send first configuration information, where the first configuration information is used to configure at least one of the following information:

[0048] the length of the SCP of the first waveform symbol;

[0049] the position of the SCP of the first waveform symbol;

[0050] the length of the first symbol component;

[0051] The position of the first symbol component.

[0052] The beneficial effects of the above second aspect and any possible implementation method thereof can be found in the description of the first aspect, i.e. the corresponding beneficial effects, and the repeated parts will not be repeated.

[0053] In a third aspect, a communication device is provided. The device can implement the method described in any possible implementation of any of the first and second aspects. The device has the functions of the first or second communication device described above. The device can be, for example, a terminal device, a functional module in a terminal device, a network device, or a functional module in a network device.

[0054] In an optional implementation, the device may include a module corresponding to the method / operation / step / action described in any possible implementation of any aspect of the first to second aspects, and the module may be a hardware circuit, or software, or a hardware circuit combined with software. In an optional implementation, the device includes a processing unit (sometimes also referred to as a processing module) and a communication unit (sometimes also referred to as a transceiver module, a communication module, etc.). The transceiver unit can implement a sending function and a receiving function. When the transceiver unit implements the sending function, it can be called a sending unit (sometimes also referred to as a sending module). When the transceiver unit implements the receiving function, it can be called a receiving unit (sometimes also referred to as a receiving module). The sending unit and the receiving unit can be the same functional module, which is called a transceiver unit, and the functional module can implement a sending function and a receiving function; or, the sending unit and the receiving unit can be different functional modules, and the transceiver unit is a general term for these functional modules.

[0055] Exemplarily, when the apparatus is used to execute the method described in any one of the first aspect to the second aspect, the apparatus may include a communication unit and a processing unit.

[0056] In a fourth aspect, an embodiment of the present application also provides a communication device, comprising a processor for executing a computer program (or computer-executable instructions) stored in a memory. When the computer program (or computer-executable instructions) is executed, the device executes the method described in any possible implementation of any one of the first to second aspects.

[0057] In one possible implementation, the processor and memory are integrated;

[0058] In another possible implementation, the memory is located outside the communication device.

[0059] The communication device also includes a communication interface, which is used for the communication device to communicate with other devices, such as sending or receiving data and / or signals. Exemplarily, the communication interface can be a transceiver, circuit, bus, module or other type of communication interface.

[0060] In a fifth aspect, a computer-readable storage medium is provided, which is used to store computer programs or instructions. When the computer-readable storage medium is executed, the method described in any possible implementation of any aspect from the first to the second aspect and the method shown in any possible implementation thereof are implemented.

[0061] In a sixth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the method described in any possible implementation of any one of the first to second aspects to be implemented.

[0062] In a seventh aspect, an embodiment of the present application further provides a communication device for executing the method described in any possible implementation of any one of the first to second aspects above.

[0063] In an eighth aspect, a chip system is provided, which includes a logic circuit (or it can be understood that the chip system includes a processor, and the processor may include a logic circuit, etc.), and may also include an input and output interface. The input and output interface can be used to input messages and can also be used to output messages. The input and output interfaces can be the same interface, that is, the same interface can implement both the sending function and the receiving function; or, the input and output interfaces include an input interface and an output interface, the input interface is used to implement the receiving function, that is, for receiving messages; the output interface is used to implement the sending function, that is, for sending messages. The logic circuit can be used to perform the operations other than the sending and receiving functions in the method described in any possible implementation of any one of the first to second aspects above; the logic circuit can also be used to transmit messages to the input and output interface, or receive messages from other communication devices from the input and output interface. The chip system can be used to implement the method described in any possible implementation of any one of the first to second aspects above. The chip system can be composed of a chip, or it can include a chip and other discrete devices.

[0064] Optionally, the chip system may further include a memory, which may be used to store instructions, and the logic circuit may call the instructions stored in the memory to implement corresponding functions.

[0065] In the ninth aspect, a communication method is provided, which may include the method implemented by the first communication device as shown in the first aspect and any possible implementation thereof, and the method implemented by the second communication device as shown in the second aspect and any possible implementation thereof.

[0066] In a tenth aspect, a communication system is provided, which may include a first communication device and a second communication device. The first communication device may be used to implement the method of the first aspect and any possible implementation thereof, and the second communication device may be used to implement the method of the second aspect and any possible implementation thereof.

[0067] The technical effects brought about by the above third to tenth aspects can be found in the description of the beneficial effects of the corresponding schemes in the above first to second aspects, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] FIG1 is a schematic diagram of the architecture of a wireless communication system provided in an embodiment of the present application;

[0069] FIG2 is a schematic diagram of adding a CP to a symbol provided by an embodiment of the present application;

[0070] FIG3 is a schematic diagram of a transmission method of a waveform symbol provided in an embodiment of the present application;

[0071] FIG4 is a schematic diagram of another waveform symbol transmission method provided in an embodiment of the present application;

[0072] FIG5 is a schematic diagram of a method for forming an equivalent CP provided in an embodiment of the present application;

[0073] FIG6 is a schematic diagram of a method of extending CP by punching provided in an embodiment of the present application;

[0074] FIG7 is a flow chart of a communication method provided in an embodiment of the present application;

[0075] FIG8 is a schematic diagram of a forward puncturing method for forming a waveform symbol according to an embodiment of the present application;

[0076] FIG9 is a schematic diagram of a backward puncturing method for forming a waveform symbol according to an embodiment of the present application;

[0077] FIG10 is a schematic diagram of another method of forming a waveform symbol by backward punching according to an embodiment of the present application;

[0078] FIG11 is a schematic diagram of another method of forming a waveform symbol by forward puncturing according to an embodiment of the present application;

[0079] FIG12 is a schematic diagram of another method of forming a waveform symbol by backward punching according to an embodiment of the present application;

[0080] FIG13 is a schematic diagram of another method of forming a waveform symbol by backward punching according to an embodiment of the present application;

[0081] FIG14 is a schematic diagram of BLER performance of a waveform symbol formed by forward puncturing provided in an embodiment of the present application;

[0082] FIG15 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0083] FIG16 is a schematic structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0084] The present application provides a communication method and apparatus. The method and apparatus are based on the same inventive concept. Since the method and apparatus solve similar problems, the implementation of the apparatus and method can refer to each other, and the repetitive parts will not be repeated.

[0085] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. The technical solutions in the embodiments of the present application can be applied to various communication systems, such as universal mobile telecommunications system (UMTS), wireless local area network (WLAN), wireless fidelity (Wi-Fi) system, 4th generation (4G) mobile communication system, such as long term evolution (LTE) system, fifth generation (5G) mobile communication system, such as new radio (NR) system, and future evolved communication systems, such as sixth generation (6G) mobile communication system.

[0086] In particular, embodiments of the present application are applicable to scenarios with severe high-frequency phase noise. This application can be applied to the following scenarios: enhanced mobile broadband (eMBB), multi-site transmission (where the same terminal device transmits signals to multiple sites), backhaul scenarios, wireless to the x (WTTx), device to device (D2D), or other scenarios with high timing requirements or high transmission rate requirements.

[0087] This application will present various aspects, embodiments or features around a system that may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all the devices, components, modules, etc. discussed in conjunction with the accompanying drawings. In addition, combinations of these schemes may also be used. In addition, in the embodiments of this application, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described in this application as an "example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present concepts in a concrete way. In the embodiments of this application, "of", "corresponding / relevant" and "corresponding" can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the meanings to be expressed are consistent.

[0088] To facilitate understanding of the embodiments of the present application, the communication system applicable to the embodiments of the present application is first described in detail using the communication system shown in FIG1 as an example. As shown in FIG1 , the communication system may include one or more network devices and one or more terminal devices. The interface between the network device and the terminal device may be a Uu interface (or air interface), and data may be transmitted between the network device and the terminal device via air interface resources.

[0089] FIG1 exemplifies scenarios applicable to embodiments of the present application, namely, eMBB (shown by the solid line in FIG1 ), multi-site transmission (shown by the dashed line ① in FIG1 ), backhaul scenarios (shown by the dashed line ② in FIG1 ), and D2D (shown by the dashed line ③ in FIG1 ). It should be understood that the four scenarios shown in FIG1 are merely examples and are not limited to these by embodiments of the present application.

[0090] In one possible scenario, the network device may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next generation NodeB (gNB), a next generation base station in a 6G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. The network device may be a macro base station, a micro base station or an indoor station, a relay node or a donor node, or a wireless controller in an open access network (open RAN, O-RAN or ORAN) or a cloud radio access network (cloud radio access network, CRAN) scenario. Optionally, the network device may also be a server, a wearable device, a vehicle or an on-board device, etc. For example, the network device in the vehicle to everything (V2X) technology may be a road side unit (RSU). All or part of the functions of the network device in this application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform). The network device in this application may also be a logical node, a logical module or software that can implement all or part of the network device functions.

[0091] In another possible scenario, multiple network devices collaborate to assist the terminal device in achieving wireless access, and different network devices respectively implement part of the functions of the base station. For example, the network device can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set separately, or they can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0092] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0093] A terminal device may also be referred to as user equipment (UE), terminal device, user apparatus, access terminal, user unit, user station, mobile station, mobile station (MS), remote station, remote terminal, mobile device, user terminal, terminal unit, terminal station, terminal apparatus, wireless communication device, user agent or user apparatus.

[0094] For example, the terminal device in the embodiment of the present application can be a mobile phone, a personal digital assistant (PDA), a laptop computer, a tablet computer, a drone, a computer with wireless transceiver function, a machine type communication (MTC) terminal device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, an Internet of Things (IoT) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, a wireless terminal device in a smart home (such as a game console, a smart TV, a smart speaker, a smart refrigerator, and fitness equipment, etc.), a vehicle-mounted terminal device, and an RSU with terminal device function.

[0095] In the embodiments of the present application, unless otherwise specified, "terminal device" may refer to the terminal device itself or a component in the terminal device, such as a system-on-a-chip (SoC); "network device" may refer to the network device itself or a component in the network device, such as a SoC.

[0096] In addition, network devices and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; and can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of network devices and terminal devices.

[0097] The communication system and scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person skilled in the art will appreciate that, with the evolution of network architecture and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.

[0098] The following first explains the relevant terms involved in the embodiments of this application. When not specifically explained, these explanations are intended to support the meaning of the relevant terms and make the embodiments of this application easier to understand, and should not be regarded as strict limitations on the relevant terms in the scope of protection claimed by this application.

[0099] (1) Fourier transform

[0100] Fourier transform is one of the most important tools for signal processing in communication systems, which is used to realize the conversion of signals between the time domain (referred to as time domain) and the frequency domain (referred to as frequency domain).

[0101] Commonly used Fourier transforms include discrete Fourier transform (DFT), fast Fourier transform (FFT), inverse discrete Fourier transform (IDFT), and inverse fast Fourier transform (IFFT).

[0102] DFT converts time-domain signals into frequency-domain signals, and FFT is a fast calculation method for DFT. IDFT converts frequency-domain signals into time-domain signals, and IFFT is a fast calculation method for IDFT.

[0103] (2) Cyclic prefix / cyclic suffix

[0104] For a signal (or sequence) S of length N, for example, S = [s_1, s_2, …, s_N], CP refers to truncating the last L elements of sequence S (L refers to the length of CP) and appending the truncated sequence of length L to the front of the original sequence S. The sequence after adding CP is: S_CP = [s_N-L+1, …, s_N, s_1, s_2, …, S_N], where CP is: [s_N-L+1, …, s_N].

[0105] For a signal (or sequence) S of length N, for example, S = [s_1, s_2, …, s_N], a cyclic suffix (CS) is created by truncating the first L elements of the sequence S (L represents the length of CS) and appending the truncated L elements to the end of the original sequence S. The resulting sequence after adding CS is: S_CS = [s_1, s_2, …, S_N, s_1, s_2, …, s_L], where CS is [s_1, s_2, …, s_L].

[0106] (3) Oversampling and undersampling

[0107] Oversampling can also be called upsampling, which means increasing the number of sampling points. Undersampling can also be called downsampling, which means reducing the number of sampling points.

[0108] When the waveform used for communication between the transmitter and receiver is a single-carrier waveform, the transmitter can perform oversampling during signal processing; correspondingly, the receiver can perform undersampling during signal processing. For example, if the number of effective subcarriers in the scheduling bandwidth is 256, after oversampling, the output IFFT length can be 1024; the oversampling factor (or upsampling factor, oversampling factor) can be equal to the ratio of the IFFT length to the number of effective subcarriers, that is, 1024 / 256 = 4. The IFFT length can be equal to the sampling rate / subcarrier width, and the IFFT length can be an integer power of 2, 3, 5, or 7.

[0109] (4) Reference signal

[0110] Network devices and terminal devices can communicate via control channels and / or data channels. For example, a control channel can be a physical downlink control channel (PDCCH) or a physical uplink control channel (PDCCH); and a data channel can be a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH).

[0111] Reference signals may be carried in control channels or data channels. Reference signals may include, for example, demodulation reference signal (DMRS), phase tracking reference signal (PTRS), channel state information reference signal (CSI-RS), sounding reference signal (SRS), tracking reference signal (TRS), primary synchronization signal (PSS), and secondary synchronization signal (SSS).

[0112] It is understandable that the above description takes the control and data channels as an example, and the network device and the terminal device may also communicate through other possible channels, such as a physical broadcast channel (PBCH).

[0113] (5) Modulation and coding strategy

[0114] Typically, a network device may indicate an MCS to a terminal device, and the network device and the terminal device may then perform uplink communication and / or downlink communication based on the MCS.

[0115] There are many ways for a network device to indicate the MCS to a terminal device. As a possible implementation, the network device may send indication information 1 and indication information 2 to the terminal device. Indication information 1 may be used to indicate a target MCS table, and indication information 2 may be used to indicate a target MCS in a target MCS table. For example, indication information 2 includes an index value of the target MCS. Then, the terminal device selects a target MCS table from a plurality of MCS tables according to indication information 1, and determines a target MCS from the target MCS table according to indication information 2. The target MCS table may include a plurality of MCS indexes (for example, MCS index 0 to MCS index 27), and each MCS index may correspond to a modulation order and a target code rate. For example, if the target MCS index value included in indication information 2 is 18, the terminal device may determine that the target MCS is MCS18. For example, the modulation order corresponding to MCS18 is 4, and the corresponding target code rate is 490. MCS18 may also be recorded as MCS (4, 490).

[0116] (6) Multi-carrier waveform and single-carrier waveform

[0117] In the communication system illustrated in Figure 1, taking the communication between a network device and a terminal device as an example, the signal transmitter can be the terminal device, and the signal receiver can be the network device; alternatively, the signal transmitter can be the network device, and the signal receiver can be the terminal device. The following description uses "the signal transmitter is the terminal device, and the signal receiver is the network device" as an example. The waveform used in the communication between the network device and the terminal device can be a multi-carrier waveform or a single-carrier waveform. The following describes multi-carrier waveforms and single-carrier waveforms respectively.

[0118] Multi-carrier refers to arranging the transmit signals in parallel and forming a transmit signal through IFFT. Single-carrier refers to convolving the serially arranged transmit signals with a roll-off filter to form a transmit signal.

[0119] (1) Multi-carrier waveform

[0120] When a network device and a terminal device communicate using a multi-carrier waveform, the transmitter (e.g., the terminal device) arranges the transmit signals in parallel and forms the transmit signal using an IFFT process. As shown in Figure 2, time domain symbol n includes a data sequence, and the data sequence's CP is located between time domain symbol n and time domain symbol n-1. The CP can serve as a guard interval between symbol n and symbol n-1. For example, the multi-carrier waveform can be an orthogonal frequency division multiplexing (OFDM) waveform.

[0121] (2) Single carrier waveform

[0122] For example, the single-carrier waveform can be a single-carrier-quadrature amplitude modulation (SC-QAM) waveform. Furthermore, the DFT-s-OFDM waveform is nearly equivalent to a traditional single-carrier waveform, but utilizes a multi-carrier implementation, making it compatible with OFDM. However, it is still essentially a single-carrier waveform.

[0123] The following uses OFDM waveforms as an example to describe a possible signal processing flow diagram for a network device and a terminal device. In this case, one of the network device and the terminal device can function as a transmitter, and the other can function as a receiver.

[0124] As shown in Figure 3, the transmitter can convert M consecutive data symbols into an M-dimensional data block S through serial to parallel conversion (s-to-p). k =[S k [0],S k[1],…,S k [m],S k [m+1],…,S k [M-1]] T , where the subscript k represents the number of the OFDM symbol and m represents the sampling point index. Through subcarrier mapping, S k The M symbols carried modulate M subcarriers among the N subcarriers, and the remaining (NM) subcarriers can be understood as being modulated by 0, obtaining an N-dimensional symbol vector X k .X k A set of N complex time domain sampling points x is obtained by N-point IDFT and parallel to serial conversion (p-to-s) k =[x k [0],x k [1],…,x k [N-1]] T Furthermore, a guard interval is inserted at the beginning of the OFDM symbol to eliminate ISI and ICI caused by multipath propagation. The guard interval is obtained by adding CP to the beginning of the symbol. k The last G samples of x k At the beginning of the time domain OFDM signal Therefore, an OFDM symbol contains valid data x k and cyclic prefix (redundant data). In this application, it can be considered that M and M have the same meaning, so the two can be replaced with each other. In addition, it can be considered that N and N have the same meaning, so the two can be replaced with each other.

[0125] Here we introduce the concept of CP intercept point. CP and x k The last G samples (i.e. x k [NG],…,x k [N-1]) is equal. The CP intercept point corresponds to x k The sampling index is NG-1. That is, the next sampling value of the CP intercept point is equal to the first value of CP.

[0126] The OFDM symbols are sent to the digital-to-analog converter (DAC) and the radio frequency (RF) filter for signal transmission. The transmitted signal is transmitted through the channel to the receiving end, and the receiving end sends the received signal to the RF filter and the analog-to-digital converter (ADC) to obtain the sampled signal. After removing the CP of the sampled signal, the serial-to-parallel conversion is performed. After the conversion, the N-point DFT is performed to transform the time domain signal into the frequency domain. The useful M signals are extracted from the subcarriers in the frequency domain. This process can be called subcarrier demapping. The extracted M signals are processed (such as channel equalization) to obtain the data block S k estimated value.

[0127] Assuming that the receiving end can obtain time and frequency synchronization, the CP removal operation (i.e., removing the first G samples in the received signal) can obtain a data block containing N samples without ISI. In addition, the data block is still an OFDM symbol x k Circular convolution with the channel impulse response. Circular convolution can be effectively converted into a frequency-domain multiplication operation through FFT, and then channel equalization can be completed with low complexity using frequency-domain single-tap equalization.

[0128] Optionally, for the DFT-s-OFDM waveform, based on the transmission process of the OFDM waveform in Figure 3, the transmitter and receiver need to perform M-point DFT and M-point IDFT respectively. Through this operation, the DFT-s-OFDM signal has the characteristics of a single carrier, and has a peak to average power ratio (PAPR) much lower than that of multi-carrier signals such as OFDM. Therefore, under the same power amplifier, DFT-s-OFDM can provide greater output power and higher power amplifier efficiency, thereby achieving the purpose of improving coverage and reducing energy consumption. The coverage and power consumption advantages of DFT-s-OFDM are particularly obvious on the terminal device side. Therefore, in the existing versions of LTE and NR, DFT-s-OFDM is used for uplink transmission.

[0129] Figure 4 also shows a possible signal processing flow diagram for a network device and a terminal device when a single-carrier frequency domain equalization (SC-FDE) waveform is used. One of the network device and the terminal device can function as a transmitter, and the other can function as a receiver.

[0130] At the transmitting end, the partition module divides the phase shift keying (PSK) symbol (such as binary phase shift keying (BPSK) symbol, π / 2-BPSK symbol, quadrature phase shift keying (QPSK) symbol, etc.) or quadrature amplitude modulation (QAM) symbol stream into a series of data blocks s of length M. k Furthermore, the sender adds Q-length CP to each data block, i.e., copies s k The last Q symbols to s k (In this case, the CP intercept point corresponds to symbol index MQ-1.) Further shaping filtering is performed, including upsampling and filtering (such as root-raised cosine pulse shaping). Finally, the transmitter transmits the resulting signal. The addition of the CP transforms the linear convolution of the multipath channel into a circular convolution, enabling the receiver to use low-complexity single-tap frequency-domain channel equalization.

[0131] The CP in Figure 4 is added before the shaping filter. In fact, adding a CP containing Q symbols before the shaping filter can also be equivalent to adding a CP containing Q symbols after the pulse shaping filter. or CP of sample values, where P up Represents the upsampling factor. represents the floor operator. That is, or It can be understood as equal to G.

[0132] It is understood that in this application, for the DFT-s-OFDM waveform, the upsampling factor is N / M. In addition, it can be assumed that the SC-FDE symbol and the DFT-s-OFDM symbol have the same sampling rate, that is,

[0133] Currently, the design of CP length mainly considers the following factors:

[0134] (1) To completely eliminate ISI, the length of the CP must be greater than or equal to the maximum delay spread.

[0135] That is to say, taking OFDM symbols as an example, it can be required that: In this application, N d Indicates the number of sampling points included in the maximum delay spread. d Indicates the maximum delay spread. T sIndicates the sampling interval. Represents the ceiling operator.

[0136] As shown in Figure 2, the specific implementation is to copy x k (The corresponding signal time domain length is expressed as T u ) of the last G samples (the corresponding signal time domain length is expressed as T CP ) and append them to x k At the beginning of the time domain OFDM signal The time domain length of the symbol is expressed as T symb Therefore, an OFDM symbol contains valid data x k and cyclic prefix (i.e. redundant data).

[0137] That is, when the length of the CP is greater than or equal to the delay spread, ISI can be avoided and the channel linear convolution can be converted to a circular convolution, enabling low-complexity frequency-domain channel equalization.

[0138] In addition, the cost of using CP is the reduction of spectral efficiency, because the CP part carries redundant data. The loss of spectral efficiency can be expressed as T CP / T symb , where T CP is the duration of CP, and T symb is the duration of an OFDM symbol. symb =T CP +T u , T u =NT s =1 / Δf, Δf is the subcarrier spacing. u The physical meaning of the valid data x k duration.

[0139] Furthermore, for SC-FDE waveforms, when non-Nyquist pulses are used, pulse shaping can also introduce ISI. For SC-FDE, DFT-s-OFDM, and OFDM modulation, when the RF filter uses non-Nyquist pulses, ISI can also be introduced. In this application, baseband and RF shaping pulses can be considered part of the channel, meaning that the maximum delay spread (DS) includes the multipath introduced by non-Nyquist pulses.

[0140] (2) Timing error must also be considered when designing the CP length.

[0141] Consider the uplink scenario. The base station informs the UE of the timing advance through a timing advance command, ensuring that the uplink signal arrives at the base station (or access point) at the desired time, and that the maximum delay spread (DS) does not exceed the CP length. For example, the base station measures any useful uplink signal to determine the propagation delay, and thus the timing advance. Mathematically, the above requirements can be modeled as:

[0142] 0≤T d -t TA +τ prop ≤T CP ;

[0143] Among them, t TA is the timing advance, and τ prop is the propagation delay. Ideally, -t TA +τ prop = 0. However, due to the propagation delay measurement error, the quantization error of the indicated timing advance information, the crystal oscillator frequency drift of the UE and the base station, etc., the uplink signal experiences a reception timing error, i.e., t TA May be greater than τ prop , which may also be less than τ prop If T CP =T d , and the timing error makes τ prop Greater than t TA At this time T d -t TA +τ prop will be greater than T CP , the symbol will be affected by ISI as well as ICI.

[0144] In this application, ISI can occur when some components of the previous symbol fall within the receiving window (FFT window) of the current symbol. ICI can also occur when the signals corresponding to some paths (such as the last path) do not completely fall within the receiving FFT window. It should be understood that when the receiving end uses FFT to convert a signal from the time domain to the frequency domain, the starting and ending positions of the FFT window are fixed.

[0145] In addition, in order to minimize the negative impact of ISI in the presence of timing errors, the receiver often shifts the FFT window position forward. The shift amount is generally 10% to 20% of the CP length. That is, if there is no timing error, the CP length is equivalently reduced by 10% to 20%. If T d In addition, if the RX FFT window advance exceeds the CP length, the symbols will also be affected by ISI and ICI.

[0146] In coordinated multipoint transmission (CoMP) scenarios, the UE and the primary access point (PAP) can achieve zero timing error. However, due to factors such as the geographic distance between the PAP and the secondary access point, timing error may exist between the UE and the secondary access point. If the timing error between the UE and the secondary access point is not considered, in some cases, such as when the timing error plus the maximum delay spread (DS) exceeds the CP length, symbols will be subject to ISI and ICI. For ease of explanation, this application refers to the situation where the timing error plus the maximum delay spread exceeds the CP length as "over-CP."

[0147] Currently, the CP length is described in the 3GPP related protocols as in Indicates the index number of the symbol in the subframe, where Indicates the number of OFDM symbols contained in a slot, and Indicates the number of slots in a subframe (1ms in duration) when the parameter set (Numerology) is μ. In addition, the OFDM symbol period is described as The formula is:

[0148] Here, κ = 64. As can be seen, NR supports two CP lengths: normal CP (NCP) and extended CP (ECP). The overhead of NCP is approximately 144 / (2048 + 144) = 6.6%, while the overhead of ECP is approximately 512 / (512 + 2048) = 20%. Therefore, the overhead of ECP is much higher than that of NCP. Furthermore, NR currently stipulates that NCP or ECP can only be used when μ = 2, that is, when the subcarrier spacing is 60 kHz. NCP is used for other μ values.

[0149] It can be understood that μ is the parameter set configuration index. s If certain, the application may use the number of sampling points included in the time length to describe the time length.

[0150] (7)SCP

[0151] For excessive CP, an SCP is added to the symbol to extend the CP length. The SCP and CP together form an equivalent CP. For example, as shown in Figure 5, in two serially transmitted symbols, the D2 portion of the previous symbol k-1 serves as the SCP for the current symbol k. This SCP and the CP of the current symbol k form an equivalent CP.

[0152] For the sake of convenience, the length of the added SCP is recorded as N SCP .

[0153] (8) Punching

[0154] Number (a) in Figure 6 shows two symbols that are adjacent in the time domain before puncturing, including the current symbol and the symbol before the current symbol. The current symbol is a high-importance symbol. In this application, high-importance symbols include: synchronization symbols (such as primary synchronization symbols and secondary synchronization symbols), reference symbols (such as demodulation reference signals and channel state information reference signals), control symbols (such as physical downlink control channel symbols and physical uplink control channel symbols) and (low latency) high-reliability symbols. The symbol before the current symbol is an ordinary data symbol, such as an ordinary data symbol in a data channel such as PUSCH or PDSCH (although high-reliability symbols are also data symbols, the ordinary data symbols here do not include high-reliability symbols).

[0155] Puncturing can be understood as replacing the original signal with a new signal. For example, as shown in number (b) in Figure 6, consider forward puncturing, where the D2 portion of the current symbol replaces the tail portion of the previous symbol, where the end position of D2 is the CP interception point of the current symbol. It can be seen that the D2 portion of the current symbol is exactly the same as the D2 portion of the previous symbol, achieving lossless CP extension, so puncturing can be used as a flexible protection interval solution. In addition, backward puncturing can also be used to achieve flexible protection intervals. In backward puncturing, the signal of the current waveform symbol can be used to replace the original signal in the next waveform symbol.

[0156] However, puncturing degrades the demodulation performance of common data symbols preceding or following high-importance symbols. Furthermore, it does not address the over-CP problem faced by common data symbols. Therefore, further research is needed to flexibly configure the guard interval between symbols.

[0157] In order to flexibly configure the protection interval of data symbols according to user needs and improve data transmission performance, an embodiment of the present application provides a communication method. The execution subject of the method can be a sending end and a receiving end. The sending end can be a terminal device or a module in a terminal device, and the receiving end can be a network device or a module in a network device; or, the sending end can be a network device or a module in a network device, and the receiving end can be a terminal device or a module in a terminal device. The method is described below with reference to Figure 7. In Figure 7, the execution subject is taken as an example of the sending end and the receiving end. The sending end can be replaced by a terminal device or a terminal device, a network device, a network device or an access network device, etc. as needed. In addition, the receiving end can also be replaced by a terminal device or a terminal device, a network device, a network device or an access network device, etc. as needed.

[0158] As shown in FIG7 , the method may include the following steps:

[0159] S101: The transmitting end obtains a first waveform symbol.

[0160] The first waveform symbol may be used to carry at least one of information, data, or a reference signal to be transmitted. The first waveform symbol may be a symbol of high importance or a symbol of low importance, without specific limitation.

[0161] In this application, the SCP of a first waveform symbol is the same as the first symbol component in the first waveform symbol. A symbol component can refer to a portion of a waveform symbol, such as a segment of a waveform symbol. Two waveform symbols (or signals) being the same means that the length and signal amplitude of the two waveform symbols (or signals) are the same.

[0162] The first symbol component is located at the end of the first waveform symbol. In this case, the first symbol component can be considered to be formed by backward puncturing the SCP of the first waveform symbol. Alternatively, the end position of the first symbol component in the first waveform symbol corresponds to the CP interception point of the first waveform symbol. In this case, the SCP of the first waveform symbol can be obtained by forward puncturing the first symbol component.

[0163] It can be understood that the end position of the first symbol component in the first waveform symbol corresponds to the CP interception point of the first waveform symbol, which may mean that the end position of the first symbol component is the CP interception point in the first waveform symbol, that is, the last sampling point corresponding to the first symbol component is the CP interception point in the first waveform symbol.

[0164] As a possible example, the SCP of the first waveform symbol is located before the CP of the first waveform symbol. In this case, the end position of the first symbol component in the first waveform symbol corresponds to the CP interception point of the first waveform symbol.

[0165] For example, as shown in FIG8 , the first waveform symbol can be used as the current symbol, and the waveform symbol preceding the first waveform symbol is recorded as the second waveform symbol. In FIG8 , the SCP of the first waveform symbol can be located at the end of the second waveform symbol, and the starting position of the CP of the first waveform symbol can be the same as the starting position of the first waveform symbol, so that the SCP and CP are equivalent to the CP of the first waveform symbol. Alternatively, in FIG8 , the starting position of the SCP of the first waveform symbol can also be considered to be the same as the starting position of the first waveform symbol, and the CP of the first waveform symbol can be located after the SCP of the first waveform symbol.

[0166] In the example of Figure 8 , the first waveform symbol and the second waveform symbol can be used to carry information to be sent, for example, the transmitting end generates the first waveform symbol and the second waveform symbol during the same data transmission process.

[0167] As an example of obtaining the first waveform symbol, the transmitter may replace the end of the second symbol component in the second waveform symbol with the SCP or the first symbol component of the first waveform symbol. The second symbol component is located at the end of the second waveform symbol and does not carry data. In other words, it can be considered that the second waveform symbol is forward punctured based on the first symbol component to improve the demodulation performance of the first waveform symbol. Both the first waveform symbol and the second waveform symbol can serve as data symbols.

[0168] For example, the second symbol component is a unique word (UW). A unique word can be generated by inserting a sequence into the DFT input. Exemplarily, the unique word can be an inserted UW sequence, where the UW sequence is, for example, a sequence with determined content and does not constitute data. Optionally, if the transmitting end is a terminal device, the access network device can configure the second symbol component to the terminal device. For example, if the second symbol component is a UW, the access network device can configure information such as the location of the UW, the content or length of the UW sequence, etc. to the terminal device.

[0169] Optionally, the length of the UW at the end of the second waveform symbol is greater than or equal to the SCP length of the first waveform symbol, where the UW includes the second symbol component, for example, the second symbol component is part of or all of the UW. It can also be described as that the UW length is equal to the SCP length of the first waveform symbol plus a, where a is a non-negative number. To adapt to different resource element (RE) scenarios, the value of a can be related to the number of REs, for example, a can be related to 0.5% or 1% of the number of REs, for example, a is equal to 0.5% or 1% of the number of REs.

[0170] It is understood that in the example of Figure 8 , the transmitter can generate the first and second waveform symbols separately, meaning that there is no delay in generating each waveform symbol. Furthermore, in the example of Figure 8 , the FFT window position at the receiver remains unchanged. This helps reduce interference between users in multi-user multiplexing.

[0171] The SCP length of the first waveform symbol will be described below in conjunction with embodiments, which will not be expanded here.

[0172] As shown in FIG9 , the starting position of the SCP of the first waveform symbol can be the same as the starting position of the first waveform symbol, and the CP of the first waveform symbol is located after the SCP of the first waveform symbol, so that the SCP and the CP serve as the equivalent CP of the first waveform symbol. Furthermore, as shown in FIG9 , the waveform symbol preceding the first waveform symbol is the second waveform symbol, and the waveform symbol following the first waveform symbol is the third waveform symbol.

[0173] Among them, any one or more of the first waveform symbol, the second waveform symbol or the third waveform symbol can be used to carry data. For example, the transmitting end generates the first waveform symbol, the second waveform symbol and the third waveform symbol during the same data transmission process.

[0174] Optionally, in the example shown in FIG9 , the length of the CP of the third waveform symbol can be set to be related to the SCP of the first waveform symbol. For example, the length of the CP of the third waveform symbol is the CP minus the SCP of the first waveform symbol; wherein the CP can be NCP or ECP.

[0175] As an implementation of Figure 9, the transmitting end can replace the third symbol component in the third waveform symbol with the fourth symbol component, wherein the starting position of the third symbol component is the same as the starting position of the third waveform symbol, that is, the third symbol component is located at the beginning of the third waveform symbol, and the length of the third symbol component is the same as the length of the fourth symbol component. Therefore, the implementation shown in Figure 9 can extend the CP of the first waveform symbol by backward puncturing. The fourth symbol component is the same as the end signal of the CP of the first waveform symbol. For example, the CP of the first waveform symbol is copied based on the symbol component after the CP interception point of the first waveform symbol (the end of the symbol component is the fourth symbol component), and on this basis, the SCP is added before the CP of the first waveform symbol, and the first waveform symbol is shifted backward as a whole, so that the fourth symbol component with the same length as the SCP at the end of the first waveform symbol replaces the third symbol component of the third waveform symbol.

[0176] It can be understood that, in the embodiment shown in FIG9 , when the receiving end demodulates the first waveform symbol, the FFT window needs to be shifted back by the SCP length.

[0177] As another possible example, the SCP of the first waveform symbol is located after the CP of the first waveform symbol, and the SCP of the first waveform symbol is continuous with the CP of the first waveform symbol. In this case, the first symbol component may be located at the end of the first waveform symbol. The first symbol component may be the CS of the first waveform symbol.

[0178] For example, as shown in Figure 10, CS is the first symbol component in the first waveform symbol. Furthermore, in Figure 10, the CP of the first waveform symbol is copied from the second symbol component preceding CS, meaning the CP of the first waveform symbol is the same as the second symbol component. Furthermore, as shown in Figure 10, the waveform symbol preceding the first waveform symbol is the second waveform symbol, and the waveform symbol following the first waveform symbol is the third waveform symbol. Alternatively, CS, or the first symbol component, is located at the beginning of the third waveform symbol, meaning the starting position of the first symbol component is the same as the starting position of the third waveform symbol.

[0179] As a possible implementation of FIG10 , the third symbol component in the third waveform symbol can be replaced with the first symbol component. Similar to the description in FIG9 , the starting position of the third symbol component is the same as the starting position of the third waveform symbol, and the length of the third symbol component is the same as the length of the first symbol component. Therefore, the implementation shown in FIG10 can extend the CP of the first waveform symbol through backward puncturing.

[0180] It can be understood that, in the embodiment shown in FIG10 , when the receiving end demodulates the first waveform symbol, the FFT window needs to be shifted back by the SCP length.

[0181] Based on the embodiments of Figures 9 and 10, the demodulation performance of the second waveform symbol (or the first waveform symbol) is not affected, and therefore the demodulation performance is the best. In implementation, high-importance symbols such as synchronization symbols, reference symbols, and control symbols can be placed in the first symbol to reduce the demodulation delay at the receiving end and enhance the demodulation performance of high-importance symbols. In addition, based on the embodiments of Figures 9 and 10, there is no delay between the waveform symbols generated by the transmitting end.

[0182] Optionally, to reduce the degradation in demodulation performance caused by puncturing the punctured symbols, a symbol component or signal that does not carry data can be added after the CP of the punctured symbol. As shown in Figures 9 and 10, the CP of the third waveform symbol can also include a sixth symbol component after the CP of the third waveform symbol. The sixth symbol component is located after the CP of the third waveform symbol and is continuous with the CP of the third waveform symbol. The sixth symbol component does not carry data. For example, the sixth symbol component can be UW.

[0183] Optionally, if the transmitting end is a terminal device, the access network device can configure the sixth symbol component to the terminal device. For example, when the sixth symbol component is UW, the access network device can configure the position of UW, the content or length of the UW sequence and other information to the terminal device.

[0184] In a possible embodiment of the present application, the length of the SCP of the first waveform symbol is related to one or more of the CP length of the first waveform symbol, the delay spread length, the importance of the first waveform symbol, the modulation and coding scheme (MCS) corresponding to the first waveform symbol, the error vector magnitude (EVM) corresponding to the first waveform symbol, or the payload size of the data. The data includes data carried by the first waveform symbol. For example, the data can be understood as data carried by at least one waveform symbol including the first waveform symbol, or as all data in a single transmission process.

[0185] The following example illustrates how to determine the length of the SCP of the first waveform symbol.

[0186] The CP length and delay spread length of the first waveform symbol can be used to determine the amount of excess CP. The excess CP amount can be defined as the sum of the maximum delay spread (MDS) of the channel and the timing synchronization error minus the CP length. For example, if the CP length is 1ms and the sum of the channel MDS and the timing synchronization error is 1.5ms, the excess CP amount is 0.5ms. In theory, when the SCP length of the waveform symbol is greater than or equal to the excess CP amount, the current symbol is not affected by ISI and ICI. However, at this time, the UW overhead is large, that is, the previous symbol transmits a smaller amount of data, and the spectrum efficiency is lower. In alignment with the spectrum efficiency of LTE or NR symbols, the introduction of UW requires an increase in the encoding and decoding code rate, and the demodulation SNR will increase with the increase in the code rate. Therefore, although the use of a longer UW improves the demodulation performance, it reduces the spectrum efficiency or equivalently requires a higher demodulation SNR.

[0187] Optionally, if the first waveform symbol uses low-order modulation (such as QPSK) or a low code rate (such as 1 / 3 code rate), or both, or if the required EVM value is relatively high, the first waveform symbol has a certain degree of anti-interference capability, or can be described as follows: even in the presence of some interference, the interference will not significantly degrade demodulation performance. Therefore, when determining the length of the SCP of the first waveform symbol, the requirement of no ICI and / or no ISI can be relaxed, that is, the SCP length can be less than the excess CP amount. Generally, the smaller the MCS, the higher the required EVM value, or both, the shorter the SCP.

[0188] Optionally, if the first waveform symbol is a high-importance symbol, to ensure that demodulation or parameter estimation performance is not affected, it is required to be free of interference or subject to minimal interference, and the SCP length needs to be as close to or less than the excess CP amount as possible. In summary, if the first waveform symbol is a high-importance symbol, the SCP length of the first waveform symbol is longer than the SCP length required when the first waveform symbol is a normal data symbol.

[0189] Furthermore, the cost of introducing UW comes at the cost of either reducing spectral efficiency or increasing the code rate. The degree of spectral efficiency degradation or code rate increase is related to the payload size of the user data channel. The larger the payload, the smaller the spectral efficiency degradation. Assuming that a user's data channel carries 1000 data symbols without UW, and that using UW reduces the transmission of 10 data symbols, UW results in a 1% loss in frequency domain efficiency. If the user's data channel carries 100 data symbols without UW, UW results in a 10% loss in frequency domain efficiency. Therefore, when the user's transmitted payload is small, the UW length can be smaller, and accordingly, the SCP length of the first waveform symbol can also be smaller. When the user's transmitted payload is large, the UW length can be larger, and accordingly, the SCP length of the first waveform symbol can also be larger. It should be understood that payload can also refer to the number of information bits carried by the data channel. Data channels include, for example, PDSCH, PUSCH, and / or PSSCH. PDSCH, PUSCH, and / or PSSCH are also referred to as PXSCH.

[0190] In the present application, the waveform symbol may be a symbol obtained through a modulation process at the transmitting end. For example, as shown in FIG4 , the transmitting end obtains a first waveform symbol after performing DFT, subcarrier mapping, IDFT, P-to-S, and adding CP on the first set. For example, the waveform symbol is, for example, a DFT-s-OFDM symbol or an SC-FDE symbol in the time domain. The length of the waveform symbol may be the same as the sum of the length of a receiving window (such as an FFT window or an IFFT window) at the receiving end and the length of the CP in the first waveform symbol.

[0191] S102: The transmitting end sends a first waveform symbol. Correspondingly, the receiving end receives the first waveform symbol.

[0192] It is understandable that "the transmitting end transmits the first waveform symbol" may also be replaced by "the transmitting end outputs the first waveform symbol." Outputting, for example, includes outputting the first waveform symbol via an interface. In this case, a communication device or module independent of the transmitting end may receive the first waveform symbol via the interface and transmit the first waveform symbol via the air interface.

[0193] Taking the signal transmission process shown in FIG4 as an example, the transmitting end can transmit the wireless signal corresponding to the first waveform symbol through the air interface channel. The wireless signal can be processed by DAC, RF and other components based on the first waveform symbol. Correspondingly, the receiving end can receive the wireless signal corresponding to the first waveform symbol.

[0194] The first waveform symbol at the receiving end may be a symbol obtained by the receiving end through RF, DAC and other operations.

[0195] S103: The receiving end demodulates the first waveform symbol and obtains data carried by the first waveform symbol.

[0196] In various embodiments of the present application, the timing of the puncturing operation and the addition of the CP to the punctured waveform symbol can be interchanged. For example, in the examples of Figures 8 to 10 , the puncturing operation of the punctured waveform symbol is performed after the CP is added. Therefore, the CP of the waveform symbol may not be consistent with the end of the waveform symbol. In another implementation, the transmitting end can first puncture the waveform symbol and then add the CP to the punctured waveform symbol. This is explained below with reference to Figures 11 to 13.

[0197] As another possible implementation of the present application, if forward puncturing is used, the CP of the waveform symbol preceding the first waveform symbol can be determined based on the SCP of the first waveform symbol to improve the demodulation performance of the punctured waveform symbol. For example, as a further improvement to the embodiment shown in FIG8 , as shown in FIG11 , the CP of the second waveform symbol can be added after the end of the second symbol component is replaced with the SCP of the first waveform symbol or the first symbol component. The CP of the second waveform symbol can be obtained by copying the symbol component including the SCP of the first waveform symbol or the first symbol component. In FIG8 , the CP of the second waveform symbol does not include the symbol component including the SCP of the first waveform symbol or the first symbol component. Since the end of the second symbol component is replaced with the SCP of the first waveform symbol or the first symbol component, that is, the CP of the second waveform symbol is different from the end of the second waveform symbol, this will result in a decrease in the demodulation performance of the second waveform symbol. However, according to the example of FIG11 , the CP of the second waveform symbol is still consistent with the end of the second waveform symbol, which can enhance the demodulation performance of the second waveform symbol. However, since the CP of the second waveform symbol in this implementation is determined by the SCP of the first waveform symbol, there are requirements for the generation order of the first waveform symbol and the second waveform symbol, that is, there is a certain delay in the generation timing of the waveform symbols.

[0198] As another possible implementation of the present application, if backward puncturing is adopted, part of the symbol components of the waveform symbol following the first waveform symbol can be punctured again according to the backward punctured signal to improve the demodulation performance of the punctured waveform symbol. The latter waveform symbol may include a symbol component that does not carry data, and the time domain position of the symbol component may include the CP interception point of the latter waveform symbol. In the backward puncturing, the symbol component at the beginning position of the waveform symbol is punctured by the signal in the first waveform symbol. The re-puncturing may mean that a section of the symbol component after the CP interception point is punctured again by the signal.

[0199] Figure 12 can be used as an example of puncturing again based on Figure 9. It can be seen that the third waveform symbol before puncturing in Figure 12 is the next waveform symbol of the first waveform symbol, and the CP of the third waveform symbol can be obtained based on the symbol component after the CP interception point. In addition, before puncturing, the third waveform symbol contains a symbol component that does not carry data, and the CP interception point is included in the time domain range of the symbol component. For example, the symbol component can be UW. Based on the description of Figure 9, in backward puncturing, the transmitter can replace the symbol component at the beginning of the third waveform symbol with the fourth symbol component. In addition, based on the example of Figure 12, the transmitter can also replace the fifth symbol component after the CP interception point of the third waveform symbol with the fourth symbol component.

[0200] For example, if the third waveform symbol before puncturing contains a symbol component that does not carry data, UW, the CP interception point of the third waveform symbol is located within UW. The length of UW is greater than or equal to the length of the SCP (or fourth symbol component) of the first waveform symbol. For example, the length of UW is equal to the length of the SCP of the first waveform symbol plus 2b, where b is a non-negative number. To accommodate different RE scenarios, b can be related to the number of REs, for example, b can be related to 0.5% or 1% of the number of REs.

[0201] Optionally, the distance from the left endpoint of the UW to the CP intercept point is b. As shown in Figure 12, the fifth symbol component starting from the CP intercept point in the UW can be replaced by the fourth symbol component. Optionally, when b is greater than 0, the symbol component between the left endpoint of the UW and the CP intercept point does not carry data, and the symbol component between the right endpoint of the fifth symbol component and the right endpoint of the UW does not carry data.

[0202] It can be understood that when the terminal device acts as the transmitter, the access network device can configure the timing of the puncturing operation and the CP adding operation to the terminal device. For example, the first information sent by the access network device to the terminal device can be used to indicate the order of the puncturing operation and the CP adding operation. For example, configuration field 1 can be used to indicate that the puncturing operation is performed before the CP adding operation; configuration field 2 can be used to indicate that the CP adding operation is performed before the puncturing operation. Among them, the configuration field 1 and configuration field 2 can be different values ​​of the same field in the configuration information, and the configuration field 1 and configuration field 2 can also be carried in different fields in the configuration information. The configuration information can be included in the RRC message, MAC CE or DCI. For example, for any of the examples in Figures 8 to 10, if the user equipment acts as the transmitter, the access network device can indicate to the user equipment that the CP adding operation is performed before the puncturing operation. For another example, for the examples in Figures 9, 10, 12 or 13, if the user equipment acts as the transmitter, the access network device can indicate to the user equipment that the puncturing operation is performed before the CP adding operation. As another implementation method, the timing of the punching operation and the CP adding operation can also be predefined. For example, the timing of the punching operation and the CP adding operation can be defined in the local configuration of the terminal device or through a protocol. The terminal device can then determine the order of the punching operation and the CP adding operation based on the predefined order. In this case, no additional configuration of the access network device is required.

[0203] Optionally, if the sending end is a terminal device, the access network device may configure the UW to the terminal device. For example, the access network device may configure information such as the location of the UW, the content or length of the UW sequence, etc. to the terminal device.

[0204] In various embodiments of the present application, if the transmitting end is a terminal device, the access network device may indicate the puncturing direction to the terminal device. For example, configuration field 1 may be used to indicate forward puncturing, and configuration field 2 may be used to indicate backward puncturing. Configuration field 1 and configuration field 2 may be different values ​​of the same field in the configuration information, and configuration field 1 and configuration field 2 may also be carried in different fields in the configuration information. The configuration information may be an RRC message, a MAC CE, or a DCI. For example, for the examples of Figure 8 or Figure 11, if the user equipment is the transmitting end, the access network device may indicate forward puncturing to the user equipment. For another example, for the examples of Figure 9, Figure 10, Figure 12, or Figure 13, if the user equipment is the transmitting end, the access network device may indicate backward puncturing to the user equipment. As another implementation method, the puncturing direction may also be predefined. For example, the puncturing direction may be defined in the local configuration of the terminal device or through a protocol. The terminal device may then determine the puncturing direction based on the predefined direction, and no additional configuration of the access network device is required.

[0205] In the present application, the access network device may send first configuration information to the terminal device, and the first configuration information may be used to configure the terminal device to send and / or receive the first waveform symbol using the method in the present application.

[0206] Illustratively, in uplink transmission, the first configuration information may include at least one of the length and position (e.g., starting position) of the SCP of the first waveform symbol, and the length and position of the first symbol component. The length of the SCP of the first waveform symbol is the same as the length of the first symbol component; the position of the SCP of the first waveform symbol and the position of the first symbol component can be described in the aforementioned embodiment.

[0207] In addition, the first configuration information may also include UW configuration, puncturing direction configuration, timing between adding CP to the punctured waveform symbol and puncturing operation, etc. For the above configurations, please refer to the description in this application, and the repeated parts will not be repeated.

[0208] In addition, in downlink transmission, the first configuration information may include the configuration of the starting position of the FFT window at the receiving end, the UW configuration, and other information so that the receiving terminal device can implement demodulation of the first waveform symbol. The above configurations can be referred to the description in this application, and the repeated parts will not be repeated.

[0209] Optionally, the first configuration information may be included in an RRC message, a MAC CE, or a DCI. For example, the access network device may configure the SCP length of the first waveform symbol to the terminal device through an RRC message or a MAC CE. In addition, the access network device may also notify the terminal device through a DCI whether any waveform symbol has an SCP. Alternatively, the access network device may also configure a plurality of candidate SCP lengths or length ranges to the terminal device through an RRC message or a MAC CE, and then notify the terminal device through a DCI whether any waveform symbol has an SCP. In addition, in the case where a waveform symbol has an SCP, the access network device may also notify or indicate an SCP length from a plurality of candidate SCP lengths through a DCI as the SCP length of the waveform symbol. For example, the candidate SCP length may include two SCP lengths, and the DCI may be used to indicate an SCP length from the two candidate SCP lengths as the SCP length of the first waveform symbol.

[0210] As shown in Figure 13, taking the example of a UW symbol component containing non-data-carrying components in the third waveform symbol before puncturing, the CP interception point of the third waveform symbol is located within the UW. The UW length is greater than or equal to the length of the SCP, the length of the CS, or the length of the first symbol component of the first waveform symbol. For example, the UW length is equal to the length of the SCP of the first waveform symbol plus 2c, where c is a non-negative number. To accommodate different RE scenarios, c can be related to the number of REs, for example, c can be related to 0.5% or 1% of the number of REs.

[0211] Optionally, the distance from the left endpoint of the UW to the CP intercept point is c. As shown in Figure 13, the fifth symbol component starting from the CP intercept point in the UW can be replaced by the first symbol component. Optionally, when b is greater than 0, the symbol component between the left endpoint of the UW and the CP intercept point does not carry data, and the symbol component between the right endpoint of the fifth symbol component and the right endpoint of the UW does not carry data.

[0212] Figure 14 shows the simulation results of the demodulation block error rate (BLER) performance. The baseline scheme is a transmission scheme that uses zero head (ZH) / zero tail (ZT) to reduce the interference caused by over-CP. Without loss of generality, Figure 14 is obtained based on the scheme shown in Figure 11. It should be understood that the schemes provided by other examples of this application can also be used to verify the gain in demodulation performance. In the comparison, the DMRS symbols all use forward puncturing to extend the CP. Since ZH, ZT and UW will bring about spectral efficiency loss, the spectral efficiency loss is converted into a code rate increase in the comparison. The SCP length, UW length and ZH / ZT length design were optimized through search.

[0213] The design using the ZH / ZT scheme includes: the SCP in the DMRS symbol has 66 samples (if it is a PDSCH, it contains 4 symbols) or 96 samples (if it is a PDSCH, it contains 14 symbols). Each data symbol has a ZT, which is 36 samples (if it contains 4 PDSCH symbols) or 78 samples (if it contains 14 PDSCH symbols). The symbol following the DMRS symbol has a ZH to mitigate interference caused by the DMRS, which is 36 samples (if it contains 4 PDSCH symbols) or 78 samples (if it contains 14 PDSCH symbols).

[0214] For the design using the scheme shown in Figure 11, the SCP in the DMRS symbol has 66 samples (if the PDSCH contains 4 symbols) or 72 samples (if the PDSCH contains 14 symbols). The SCP length of each data symbol is 48 samples (if the PDSCH contains 4 symbols) or 36 samples (if the PDSCH contains 14 symbols). The symbol following the DMRS symbol has a ZH to mitigate interference caused by the DMRS. The ZH length is 48 samples (if the PDSCH contains 4 symbols) or 36 samples (if the PDSCH contains 14 symbols). In addition, the UW length is equal to the length of the SCP plus 17 samples (if the PDSCH contains 4 symbols) or 12 samples (if the PDSCH contains 14 symbols).

[0215] As you can see, the SCP is not equal to the excess CP, which is 108 samples. Furthermore, because DMRS symbols are highly significant, their SCP length exceeds that of data symbols. Furthermore, the SCP and UW lengths are also related to the payload size (i.e., the number of symbols contained in the PDSCH).

[0216] Based on FIG14 , it can be seen that, regardless of whether the PDSCH contains 4 symbols or 14 symbols, the BLER performance of the design using the scheme shown in FIG11 is better than the baseline scheme using ZH / ZT.

[0217] It is understandable that in order to implement the functions in the above embodiments, the network devices and terminals include hardware structures and / or software modules that perform the corresponding functions. Those skilled in the art should easily realize that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution. Network device

[0218] Figures 15 and 16 are schematic diagrams of the structures of possible communication devices provided by the embodiments of the present application. These communication devices can be used to implement the functions of the sending or receiving end in the above-mentioned method embodiments, and thus can also achieve the beneficial effects possessed by the above-mentioned method embodiments. Among them, the sending and receiving ends can be used as one of the terminal and the network device respectively. In the embodiments of the present application, the communication device can be a terminal device as shown in Figure 1, or a network device as shown in Figure 1, or a module (such as a chip) applied to a terminal device or a network device.

[0219] As shown in Figure 15, a communication device 1500 includes a processing unit 1510 and a transceiver unit 1520. The communication device 1500 is used to implement the functions of the transmitting end or the receiving end in the method embodiment shown in Figure 7 above.

[0220] When the communication device 1500 is used to implement the function of the transmitting end in the method embodiment shown in FIG. 7 , the processing unit 1510 or the transceiver unit 1520 may be used to determine and send the first waveform symbol.

[0221] When the communication device 1500 is used to implement the function of the receiving end in the method embodiment shown in Figure 7, the transceiver unit 1520 can be used to receive the first waveform symbol. The processing unit 1510 or the transceiver unit 1520 can be used to demodulate the first waveform symbol to obtain the data symbol.

[0222] For a more detailed description of the processing unit 1510 and the transceiver unit 1520 , please refer to the relevant description in the method embodiment shown in FIG. 7 .

[0223] As shown in Figure 16, communication device 1600 includes a processor 1610 and an interface circuit 1620. Processor 1610 and interface circuit 1620 are coupled to each other. It will be appreciated that interface circuit 1620 may be a transceiver or an input / output interface. Optionally, communication device 1600 may further include a memory 1630 for storing instructions executed by processor 1610, input data required by processor 1610 to execute instructions, or data generated by processor 1610 after executing instructions.

[0224] When the communication device 1600 is used to implement the method shown in FIG. 7 , the processor 1610 is used to implement the functions of the processing unit 1510 , and the interface circuit 1620 is used to implement the functions of the transceiver unit 1520 .

[0225] When the above-mentioned communication device is a chip applied to a UE, the UE chip implements the functions of the transmitting end or the receiving end in the above-mentioned method embodiment. The UE chip receives information sent by the base station to the UE through other modules in the UE (such as a radio frequency module or antenna); or the UE chip sends information to other modules in the UE (such as a radio frequency module or antenna), and the information is sent by the UE to the base station.

[0226] When the above-mentioned communication device is a module applied to a base station, the base station module implements the functions of the transmitting end or the receiving end in the above-mentioned method embodiment. The base station module receives information from other modules in the base station (such as a radio frequency module or an antenna), and the information is sent by the terminal device to the base station; or, the base station module sends information to other modules in the base station (such as a radio frequency module or an antenna), and the information is sent by the base station to the terminal device. The base station module here can be the baseband chip of the base station, or it can be a CU, DU or other module, or it can be a device under the open radio access network (O-RAN) architecture, such as an open CU, open DU and other devices.

[0227] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0228] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or an O-RAN. The processor and the storage medium can also exist as discrete components in a base station or an O-RAN.

[0229] The present application also provides a computer-readable storage medium that stores instructions, which may also be referred to as a computer program, computer program code, etc. The instructions are executed on a computer, causing the computer to execute the method shown in FIG. 7 of the above method embodiment and in various embodiments of the present application.

[0230] An embodiment of the present application further provides a computer program product, including a computer program or instructions. When the computer program or instructions are executed on a computer, the method shown in FIG. 7 and various embodiments of the present application is implemented.

[0231] An embodiment of the present application further provides a chip, which includes a processor coupled to a memory, and the processor is configured to execute a computer program or instruction stored in the memory, so that the method shown in FIG7 and the various embodiments of the present application is implemented. For example, taking the chip implementing the function of an access network device as an example, the chip can receive information from other modules of the access network device (such as a radio frequency or antenna, etc.), and the information can be sent by a terminal to the access network device. Alternatively, the chip can send information to other modules in the access network device (such as a radio frequency or antenna, etc.), and the information is sent by the access network device to the terminal, etc.

[0232] The embodiment of the present application further provides a communication system, including a first communication device and a second communication device. The first communication device and the second communication device can be used to implement the functions of the transmitting end and the receiving end in the present application, respectively.

[0233] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0234] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0235] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of this application, the character " / " indicates that the previous and next associated objects are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0236] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A communication method, characterized in that: include: Obtain a first waveform symbol, wherein a supplementary cyclic prefix SCP of the first waveform symbol is the same as a first symbol component in the first waveform symbol; The first symbol component is located at the end of the first waveform symbol, or the end position of the first symbol component in the first waveform symbol corresponds to a cyclic prefix CP interception point of the first waveform symbol; Outputting the first waveform symbol; The length of the SCP of the first waveform symbol is related to at least one of the following information: the CP length of the first waveform symbol; or, The delay spread length; or, The significance of the first waveform symbol; or A modulation coding scheme MCS corresponding to the first waveform symbol; or, The error vector magnitude (EVM) corresponding to the first waveform symbol; or, The payload size of data includes the data carried by the first waveform symbol.

2. The method according to claim 1, characterized in that The SCP of the first waveform symbol is located before the CP of the first waveform symbol, and the end position of the first symbol component in the first waveform symbol corresponds to the CP interception point of the first waveform symbol.

3. The method according to claim 2, characterized in that The method further comprises: Obtaining a second waveform symbol, where the second waveform symbol is a waveform symbol preceding the first waveform symbol; An end of a second symbol component in the second waveform symbol is replaced with the SCP of the first waveform symbol, the second symbol component is located at the end of the second waveform symbol, and the second symbol component does not carry data.

4. The method according to claim 3, characterized in that The CP of the second waveform symbol contains the same signal as the second symbol component, or; The CP of the second waveform symbol includes the same signal as the SCP of the first waveform symbol.

5. The method according to claim 4, characterized in that The method is applied to a terminal device, and the method further includes: receiving a first message; Wherein, if the CP of the second waveform symbol contains the same signal as the second symbol component, the first information is used to indicate that the CP of the second waveform symbol is added before puncturing the second waveform symbol; If the CP of the second waveform symbol includes the same signal as the SCP of the first waveform symbol, the first information is used to indicate that the CP of the second waveform symbol is added after puncturing the second waveform symbol.

6. The method according to any one of claims 3 to 5, characterized in that: The method is applied to a terminal device, and the method further includes: Second information is received, where the second information is used to indicate forward puncturing.

7. The method according to claim 2, characterized in that Also includes: Get the third tilde symbol; The third symbol component in the third waveform symbol is replaced by a fourth symbol component, the starting position of the third symbol component is the same as the starting position of the third waveform symbol, the length of the third symbol component is the same as the length of the fourth symbol component, and the fourth symbol component is the same as the end signal of the CP of the first waveform symbol.

8. The method according to claim 7, characterized in that The method further comprises: The fifth symbol component in the third waveform symbol is replaced by the fourth symbol component, the fifth symbol component does not carry data, and the starting position of the fifth symbol component is a sampling point after the CP interception point of the third waveform symbol.

9. The method according to claim 8, characterized in that The method is applied to a terminal device, and the method further includes: Third information is received, where the third information is used to indicate that the fifth symbol component is replaced by the fourth symbol component.

10. The method according to claim 8 or 9, characterized in that The symbol component before the fifth symbol component and / or the symbol component after the fifth symbol component do not carry data, the symbol component before the fifth symbol component is continuous with the fifth symbol component, and the fifth symbol component and the symbol component after the fifth symbol component are continuous.

11. The method according to claim 1, characterized in that The SCP of the first waveform symbol is located after the CP of the first waveform symbol, and the SCP of the first waveform symbol is continuous with the CP of the first waveform symbol, the first symbol component is located at the end of the first waveform symbol, the CP of the first waveform symbol is the same as a second symbol component in the first waveform symbol, the second symbol component is located before the first symbol component, and the second symbol component is continuous with the first symbol component.

12. The method according to claim 11, characterized in that Also includes: Get the third tilde symbol; A third symbol component in the third waveform symbol is replaced by the first symbol component, a starting position of the third symbol component is the same as a starting position of the third waveform symbol, and a length of the third symbol component is the same as a length of the first symbol component.

13. The method according to claim 12, characterized in that The method further comprises: The fifth symbol component of the third waveform symbol is replaced by the first symbol component, the fifth symbol component does not carry data, and the starting position of the fifth symbol component is a sampling point after the CP interception point of the third waveform symbol.

14. The method according to claim 13, characterized in that The method is applied to a terminal device, and the method further includes: Fourth information is received, wherein the third information is used to indicate that the fifth symbol component is replaced by the first symbol component.

15. The method according to claim 13 or 14, characterized in that The symbol component before the fifth symbol component and / or the symbol component after the fifth symbol component do not carry data, the symbol component before the fifth symbol component is continuous with the fifth symbol component, and the fifth symbol component and the symbol component after the fifth symbol component are continuous.

16. The method according to any one of claims 7-10, 12-15, characterized in that: The third waveform symbol includes a sixth symbol component, the sixth symbol component is located after the CP of the third waveform symbol, the sixth symbol component is continuous with the CP of the third waveform symbol, and the sixth symbol component does not carry data.

17. The method according to any one of claims 7 to 16, characterized in that: The method is applied to a terminal device, and the method further includes: Second information is received, where the second information is used to indicate backward puncturing.

18. The method according to any one of claims 1 to 17, characterized in that: The method is applied to a terminal device, and obtaining the first waveform symbol includes: Obtaining the first waveform symbol according to the first configuration information; The first configuration information is used to configure at least one of the following information: the length of the SCP of the first waveform symbol; the position of the SCP of the first waveform symbol; the length of the first symbol component; The position of the first symbol component.

19. A communication method, characterized in that: include: receiving a first waveform symbol, where the first waveform symbol is used to carry data, and a supplementary cyclic prefix SCP of the first waveform symbol is the same as a first symbol component in the first waveform symbol; The first symbol component is located at the end of the first waveform symbol, or the end position of the first symbol component in the first waveform symbol corresponds to a cyclic prefix CP interception point of the first waveform symbol; Demodulating the first waveform symbol to obtain the data; The length of the SCP of the first waveform symbol is related to at least one of the following information: the CP length of the first waveform symbol; or, The delay spread length; or, The significance of the first waveform symbol; or A modulation coding scheme MCS corresponding to the first waveform symbol; or, The error vector magnitude (EVM) corresponding to the first waveform symbol; or, The payload size of data includes the data carried by the first waveform symbol.

20. The method of claim 19, wherein: The SCP of the first waveform symbol is located before the CP of the first waveform symbol, and the end position of the first symbol component in the first waveform symbol corresponds to the CP interception point of the first waveform symbol.

21. The method of claim 20, wherein: The method further comprises: A second waveform symbol is received, the second waveform symbol being a waveform symbol preceding the first waveform symbol, the end of a second symbol component in the second waveform symbol being replaced with the SCP of the first waveform symbol, the second symbol component being located at the end of the second waveform symbol and the second symbol component carries no data.

22. The method according to claim 21, characterized in that The CP of the second waveform symbol contains the same signal as the second symbol component, or; The CP of the second waveform symbol includes the same signal as the SCP of the first waveform symbol.

23. The method of claim 22, wherein: The method is applied to an access network device, and the method further comprises: Sending the first message; Wherein, if the CP of the second waveform symbol contains the same signal as the second symbol component, the first information is used to indicate that the CP of the second waveform symbol is added before puncturing the second waveform symbol; If the CP of the second waveform symbol includes the same signal as the SCP of the first waveform symbol, the first information is used to indicate that the CP of the second waveform symbol is added after puncturing the second waveform symbol.

24. The method according to any one of claims 21 to 23, characterized in that: The method is applied to an access network device, and the method further comprises: Second information is sent, where the second information is used to indicate forward puncturing.

25. The method of claim 20, wherein: Also includes: A third waveform symbol is received, a third symbol component in the third waveform symbol is replaced by a fourth symbol component, a starting position of the third symbol component is the same as a starting position of the third waveform symbol, a length of the third symbol component is the same as a length of the fourth symbol component, and the fourth symbol component is the same as an end signal of the CP of the first waveform symbol.

26. The method of claim 25, wherein: The fifth symbol component in the third waveform symbol is replaced by the fourth symbol component, the fifth symbol component does not carry data, and the starting position of the fifth symbol component is a sampling point after the CP interception point of the third waveform symbol.

27. The method of claim 26, wherein: The method is applied to an access network device, and the method further comprises: Send third information, where the third information is used to indicate that the fifth symbol component is replaced by the fourth symbol component.

28. The method according to claim 26 or 27, characterized in that The symbol component before the fifth symbol component and / or the symbol component after the fifth symbol component do not carry data, the symbol component before the fifth symbol component is continuous with the fifth symbol component, and the fifth symbol component and the symbol component after the fifth symbol component are continuous.

29. The method of claim 19, wherein: The SCP of the first waveform symbol is located after the CP of the first waveform symbol, and the SCP of the first waveform symbol is continuous with the CP of the first waveform symbol, the first symbol component is located at the end of the first waveform symbol, the CP of the first waveform symbol is the same as a second symbol component in the first waveform symbol, the second symbol component is located before the first symbol component, and the second symbol component is continuous with the first symbol component.

30. The method of claim 29, wherein: Also includes: A third waveform symbol is received, a third symbol component in the third waveform symbol is replaced by the first symbol component, a starting position of the third symbol component is the same as a starting position of the third waveform symbol, and a length of the third symbol component is the same as a length of the first symbol component.

31. The method of claim 30, wherein: The fifth symbol component in the third waveform symbol is replaced by the first symbol component, the fifth symbol component does not carry data, and the starting position of the fifth symbol component is a sampling point after the CP interception point of the third waveform symbol.

32. The method of claim 31, wherein: The method is applied to an access network device, and the method further comprises: Send fourth information, where the fourth information is used to indicate that the fifth symbol component is replaced by the first symbol component.

33. The method according to claim 31 or 32, characterized in that The symbol component before the fifth symbol component and / or the symbol component after the fifth symbol component do not carry data, the symbol component before the fifth symbol component is continuous with the fifth symbol component, and the fifth symbol component and the symbol component after the fifth symbol component are continuous.

34. The method according to any one of claims 25-28, 30-33, characterized in that: The third waveform symbol includes a sixth symbol component, the sixth symbol component is located after the CP of the third waveform symbol, the sixth symbol component is continuous with the CP of the third waveform symbol, and the sixth symbol component does not carry data.

35. The method according to any one of claims 25 to 34, characterized in that: The method is applied to an access network device, and the method further comprises: Second information is sent, where the second information is used to indicate backward puncturing.

36. The method according to any one of claims 19 to 35, characterized in that: The method is applied to an access network device, and the method further comprises: Sending first configuration information, where the first configuration information is used to configure at least one of the following information: the length of the SCP of the first waveform symbol; the position of the SCP of the first waveform symbol; the length of the first symbol component; The position of the first symbol component.

37. A communication device, characterized in that: The method comprises a processor configured to execute a computer program or an instruction to implement the method according to any one of claims 1 to 18, or to implement the method according to any one of claims 19 to 36.

38. A computer-readable storage medium, characterized in that: The storage medium stores a computer program or instruction. When the computer program or instruction is executed by the communication device, the method as described in any one of claims 1 to 18 is implemented, or the method as described in any one of claims 19 to 36 is implemented.

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