Communication method and device

Abstract

The invention provides a communication method and device, which are used for realizing flexible configuration of guard intervals between symbols. The method comprises: a first communication device obtaining a first waveform symbol, the SCP of the first waveform symbol being 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; the first communication device may also output a 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 extension length; or, importance of the first waveform symbol; or a modulation coding and decoding scheme corresponding to the first waveform symbol; or the error vector amplitude corresponding to the first waveform symbol; or, the load size of the data, and the data comprises the data borne by the first waveform symbol.

Description

Technical Field

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

[0002] In wireless communication systems, the medium that propagates the signal from the transmitter to the receiver is called a channel. Multipath is a propagation phenomenon that causes a radio signal to reach the receiver through two or more paths. The causes of multipath may include atmospheric ducting, ionospheric reflection and refraction, or reflection from water and land objects (such as mountains and buildings). Since the multiple components of the signal under multipath propagate different distances, they will arrive at the receiver at different times, and different components correspond to different paths. Among them, the time difference between the arrival of the first path component and the last component of the same signal is called the maximum delay spread (delay spread, DS).

[0003] Multipath signal propagation can cause inter-symbol interference (ISI) and inter-carrier interference (ICI), which can degrade communication performance. In order to eliminate ISI and ICI between symbols, a guard interval (GI) is usually inserted between symbols. However, how to flexibly configure the guard interval between symbols still needs further research. Summary of the invention

[0004] The present application provides a communication method and device for realizing flexible configuration of protection intervals between symbols to improve transmission performance.

[0005] In a first aspect, a communication method is provided. The method may be implemented by a first communication device. The first communication device may be used to send a signal. For example, the first communication device may be a terminal device or an access network device (or replaced by a network device, such as a base station). The first communication device may also be a component in a terminal device or a component in an 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.

[0006] 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 corresponding to the first waveform symbol; or the error vector amplitude corresponding to the first waveform symbol; or the load size of data, wherein the data includes the data carried by the first waveform symbol.

[0007] 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, and 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 extension length, the importance of the first waveform symbol, the modulation and decoding scheme corresponding to the first waveform symbol, the error vector amplitude corresponding to the first waveform symbol, or the data load size, so that flexible extension of the CP can be achieved.

[0008] In a possible implementation manner, 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.

[0009] In a possible implementation, the first communication device may also obtain a second waveform symbol, which is the previous waveform symbol of 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, the second symbol component is located at the end of the second waveform symbol, and the second symbol component 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 by forward puncturing. In addition, the second symbol component does not carry data, which also reduces the degradation of the demodulation performance of the second waveform symbol caused by the puncturing operation.

[0010] In one possible implementation, 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. 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. Among them, in the case of adding the CP first and then puncturing, the generation timing of the first waveform symbol and the second waveform symbol is not restricted, so there is no generation delay between each waveform symbol, but the demodulation performance of the second waveform symbol is reduced. In the case of puncturing first and then adding the CP, 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 each waveform symbol, but the demodulation performance of the second waveform symbol is improved.

[0011] In a possible implementation, if the first communication device is a terminal device, the first communication device may also receive 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. Based on this implementation, the access network device may indicate to the terminal device the execution order of the puncturing operation and the CP adding operation.

[0012] In a possible implementation, if the first communication device is a terminal device, the first communication device may also 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.

[0013] In a possible implementation, the first communication device may also obtain a third waveform symbol; replace the third symbol component in the third waveform symbol with 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. Based on this implementation, the first communication device may replace the symbol component at the beginning of the third waveform symbol with the symbol component that is the same as the SCP of the first waveform symbol, so that the CP of the first waveform symbol may be extended by backward puncturing.

[0014] In a possible implementation, the first communication device may also 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 a sampling point after the CP interception point of the third waveform symbol. Based on this implementation, the first communication device may replace the fifth symbol component in the third waveform symbol with a symbol component (i.e., the fourth symbol component) that is the same as the SCP of the first waveform symbol. Since the fifth symbol component is the same as the fourth symbol component, the CP of the third waveform symbol may be extended by puncturing, thereby improving the demodulation performance of the third waveform symbol.

[0015] In a possible implementation, if the first communication device is a terminal device, the first communication device may also receive third information, wherein the third information is used to indicate that the fifth symbol component is replaced with the fourth symbol component. Based on this implementation, the access network device may indicate to the terminal device that the fifth symbol component is replaced with the fourth symbol component.

[0016] In a possible implementation, 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. Based on this implementation, the puncturing of the fifth symbol component can be prevented from affecting the data.

[0017] In a 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.

[0018] In a possible implementation, the first communication device may also 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, and the CP length of the first waveform symbol may be extended by forward puncturing.

[0019] 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, 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.

[0020] In a possible implementation, if the first communication device is a terminal device, the first communication device may also receive fourth information, and the fourth information may be used to indicate that the fifth symbol component is replaced with the first symbol component. Based on this implementation, the access network device may indicate to the terminal device that the fifth symbol component is replaced with the first symbol component.

[0021] In a possible implementation, 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. Based on this implementation, the puncturing of the fifth symbol component can be prevented from affecting the data.

[0022] 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. Based on this implementation, the backward puncturing can be prevented from affecting the demodulation performance of the punctured waveform symbol.

[0023] In a possible implementation, if the first communication device is a terminal device, the first communication device may also 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.

[0024] In a possible implementation, if the first communication device is a terminal device, the first communication device can obtain the first waveform symbol according to 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.

[0025] In a possible implementation, the first configuration information is carried in at least one of a radio resource control RRC message, a media 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 MAC CE. In addition, the access network device may also notify the terminal device through DCI whether there is an SCP for any waveform symbol. Alternatively, the access network device may also configure multiple candidate SCP lengths or length ranges to the terminal device through an RRC message or MACCE, and then notify the terminal device through DCI whether there is an SCP for any waveform symbol. In addition, when there is an SCP for 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.

[0026] In a second aspect, a communication method is provided. The method may be implemented by a second communication device. The first communication device may be used to receive a signal. For example, the second communication device may be an access network device or a terminal device. The second communication device may also be a component in an access network device or a component in a terminal device. Taking the execution subject as an example, the communication method provided in the present 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; demodulating the first waveform symbol to obtain the data.

[0027] 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 load size of data, wherein the data includes the data carried by the first waveform symbol.

[0028] In a possible implementation manner, 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.

[0029] In one possible implementation, the second communication device may also 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.

[0030] In a possible implementation manner, the CP of the second waveform symbol includes a signal identical to that of the second symbol component, or the CP of the second waveform symbol includes a signal identical to that of the SCP of the first waveform symbol.

[0031] In one possible implementation, if the second communication device is an access network device, the second communication device may also 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.

[0032] In a possible implementation manner, 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.

[0033] 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 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.

[0034] 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.

[0035] In a possible implementation manner, 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.

[0036] 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.

[0037] In a 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.

[0038] 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, 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.

[0039] 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.

[0040] In a possible implementation manner, 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.

[0041] 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.

[0042] 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.

[0043] In a possible implementation manner, 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.

[0044] In a 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:

[0045] the length of the SCP of the first waveform symbol;

[0046] the position of the SCP of the first waveform symbol;

[0047] the length of the first symbol component;

[0048] The position of the first symbol component.

[0049] 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 here.

[0050] In a third aspect, a communication device is provided. The device can implement the method described in any possible implementation of any aspect of the first aspect to the second aspect. The device has the functions of the first communication device or the second communication device. The device is, for example, a terminal device, or a functional module in a terminal device, or a network device or a functional module in a network device.

[0051] 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 aspect to the second aspect, 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), and 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 the sending function and the 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.

[0052] Exemplarily, when the device is used to execute the method described in any one of the first aspect to the second aspect, the device may include a communication unit and a processing unit.

[0053] 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, wherein 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.

[0054] In one possible implementation, the processor and the memory are integrated together;

[0055] In another possible implementation, the memory is located outside the communication device.

[0056] 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.

[0057] In a fifth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store computer programs or instructions, which, when executed, enables 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 to be implemented.

[0058] According to 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.

[0059] In a seventh aspect, an embodiment of the present application further provides a communication device for executing the method described in any possible implementation method of any one of the first to second aspects above.

[0060] In the 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 or output messages. The input and output interfaces may be the same interface, that is, the same interface can realize both the sending function and the receiving function; or, the input and output interface includes an input interface and an output interface, the input interface is used to realize the receiving function, that is, for receiving messages; the output interface is used to realize the sending function, that is, for sending messages. The logic circuit can be used to perform operations other than the sending and receiving functions in the method described in any possible implementation of any aspect 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 aspect of the first to second aspects above. The chip system can be composed of chips, or it can include chips and other discrete devices.

[0061] 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.

[0062] In a 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.

[0063] 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 shown in the first aspect and any possible implementation thereof, and the second communication device may be used to implement the method shown in the second aspect and any possible implementation thereof.

[0064] The technical effects brought about by the third to tenth aspects above can be found in the description of the beneficial effects of the corresponding schemes in the first to second aspects above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 A schematic diagram of the architecture of a wireless communication system provided in an embodiment of the present application;

[0066] Figure 2 A schematic diagram of adding CP to a symbol provided in an embodiment of the present application;

[0067] Figure 3 A schematic diagram of a transmission method of a waveform symbol provided in an embodiment of the present application;

[0068] Figure 4 A schematic diagram of another waveform symbol transmission method provided in an embodiment of the present application;

[0069] Figure 5 A schematic diagram of a method for forming an equivalent CP provided in an embodiment of the present application;

[0070] Figure 6 A schematic diagram of a method of extending CP by punching provided in an embodiment of the present application;

[0071] Figure 7 A flow chart of a communication method provided in an embodiment of the present application;

[0072] Figure 8 A schematic diagram of a forward puncturing method for forming a waveform symbol provided in an embodiment of the present application;

[0073] Fig. 9 A schematic diagram of a backward punching method to form a waveform symbol provided in an embodiment of the present application;

[0074] Fig.10 A schematic diagram of another method of forming a waveform symbol by backward punching provided in an embodiment of the present application;

[0075] Fig.11 A schematic diagram of another forward puncturing method for forming a waveform symbol provided in an embodiment of the present application;

[0076] Fig.12 A schematic diagram of another method of forming a waveform symbol by backward punching provided in an embodiment of the present application;

[0077] Fig.13 A schematic diagram of another method of forming a waveform symbol by backward punching provided in an embodiment of the present application;

[0078] Fig.14 A schematic diagram of BLER performance of a forward puncturing waveform symbol provided in an embodiment of the present application;

[0079] Fig.15 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0080] Fig.16 A schematic diagram of the structure of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0081] The embodiment of the present application provides a communication method and device. The method and device are based on the same inventive concept. Since the method and device solve the problem in a similar principle, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0082] 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, etc.

[0083] In particular, the embodiments of the present application can be applied to scenarios with severe high-frequency phase noise. The present application can be applied to the following scenarios: enhanced mobile broadband (eMBB), multi-site transmission (the same terminal device transmits signals to multiple sites), backhaul scenarios, wireless broadband to the home (WTTx), device to device (D2D), or other scenarios with high timing requirements or high transmission rate requirements.

[0084] The present 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 drawings. In addition, combinations of these schemes may also be used. In addition, in the embodiments of the present application, words such as "exemplarily" and "for example" are used to represent examples, illustrations or descriptions. Any embodiment or design described as an "example" in the present application 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 specific way. In the embodiments of the present 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.

[0085] To facilitate understanding of the embodiments of the present application, first Figure 1 The communication system shown in FIG. 1 is used as an example to describe in detail a communication system applicable to an embodiment of the present application. Figure 1 As shown, 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.

[0086] Figure 1 The example shows a scenario to which the embodiment of the present application is applicable, namely, eMBB ( Figure 1 Indicated by the solid line), multi-site transmission ( Figure 1 The dashed line ① shows the backhaul scenario. Figure 1 Indicated by the dashed line ②), D2D( Figure 1 It should be understood that Figure 1 The four scenarios shown are only examples and are not limited to these in the embodiments of the present application.

[0087] 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 the present application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., 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.

[0088] 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 may 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 may be separately configured, or may be included in the same network element, such as a baseband unit (BBU). The RU may be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0089] 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, CU, CU-CP, CU-UP, DU and RU are described as examples in this application. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0090] The terminal device may also be referred to as user equipment (UE), terminal equipment, user device, access terminal, user unit, user station, mobile station, mobile station (MS), remote station, remote terminal, mobile device, user terminal, terminal unit, terminal station, terminal device, wireless communication equipment, user agent or user device.

[0091] 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 (Pad), 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.

[0092] 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.

[0093] In addition, network devices and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on aircraft, balloons and satellites in the air. The embodiments of this application do not limit the application scenarios of network devices and terminal devices.

[0094] The communication system and scenario 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 of ordinary skill in the art can 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 also applicable to similar technical problems.

[0095] The following is an explanation of the relevant terms involved in the embodiments of the present application. When not specifically stated, these explanations are to support the meaning of the relevant terms and make the embodiments of the present application easier to understand, and should not be regarded as a strict limitation of the relevant terms in the scope of protection claimed by the present application.

[0096] (1) Fourier transform

[0097] 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 time domain (referred to as time domain) and frequency domain (referred to as frequency domain).

[0098] Commonly used Fourier transforms include discrete Fourier transform (DFT), fast Fourier transform (FFT), inverse discrete Fourier transform (IDFT) and inverse fast Fourier transform (IFFT).

[0099] Among them, DFT is to convert the time domain signal into the frequency domain signal, and FFT is a fast calculation method of DFT. IDFT is to convert the frequency domain signal into the time domain signal, and IFFT is a fast calculation method of IDFT.

[0100] (2) Cyclic prefix / cyclic suffix

[0101] For a signal (or sequence) S of length N, for example, S = [s_1, s_2, ..., s_N], CP refers to the last L elements of the sequence S (L refers to the length of CP), and the truncated sequence of length L is added 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].

[0102] For a signal (or sequence) S of length N, for example, S = [s_1, s_2, ..., s_N], a cyclic suffix (CS) refers to truncating the first L elements of the sequence S (L refers to the length of CS), and adding the truncated sequence of length L to the end of the original sequence S. The 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].

[0103] (3) Oversampling and undersampling

[0104] Over-sampling can also be called up-sampling, which means increasing the number of sampling points. Under-sampling can also be called down-sampling, which means reducing the number of sampling points.

[0105] When the waveform used for communication between the transmitter and the receiver is a single-carrier waveform, the transmitter can perform oversampling during the signal processing process; correspondingly, the receiver can perform undersampling during the signal processing process. For example, the number of effective subcarriers in the scheduling bandwidth is 256. After oversampling, the output IFFT length can be 1024; the oversampling multiple (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. Among them, 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.

[0106] (4) Reference signal

[0107] The network device and the terminal device can communicate through a control channel and / or a data channel. The control channel may be, for example, a physical downlink control channel (PDCCH) or a physical uplink control channel (PDCCH); the data channel may be, for example, a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH).

[0108] A reference signal may be carried in a control channel or a data channel. The reference signal may be, for example, a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking reference signal (TRS), a primary synchronisation signal (PSS), and a secondary synchronisation signal (SSS).

[0109] It is understandable that the above is based on 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).

[0110] (5) Modulation and coding strategy

[0111] 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.

[0112] There are many ways for a network device to indicate 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, such as indication information 2 including an index value of the target MCS; further, 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 (such as 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, such as the modulation order corresponding to MCS18 is 4, and the corresponding target code rate is 490, and MCS18 may also be recorded as MCS (4, 490).

[0113] (6) Multi-carrier waveform and single-carrier waveform

[0114] exist Figure 1 In the communication system shown, taking the communication between the network device and the terminal device as an example, the signal transmitter can be the terminal device, and the signal receiver can be the network device; or, the signal transmitter can be the network device, and the signal receiver can be the terminal device; the following description is taken as an example of "the signal transmitter is the terminal device, and the signal receiver is the network device". The waveform used for communication between the network device and the terminal device can be a multi-carrier waveform, or it can also be a single-carrier waveform. The multi-carrier waveform and the single-carrier waveform are described below respectively.

[0115] Among them, multi-carrier means that the transmission signals are arranged in parallel and formed by IFFT. Single carrier means that the transmission signals arranged in series are convolved with a roll-off filter to form the transmission signal.

[0116] (1) Multi-carrier waveform

[0117] When a network device and a terminal device use a multi-carrier waveform for communication, the transmitting end (such as the terminal device) arranges the transmission signals in parallel and forms the transmission signals through IFFT. Figure 2 As shown, time domain symbol n includes a data sequence, and a CP of the data sequence is included between time domain symbol n and time domain symbol n-1, and the CP can be used 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.

[0118] (2) Single carrier waveform

[0119] Exemplarily, the single carrier waveform may be a single carrier-quadrature amplitude modulation (SC-QAM) waveform. In addition, the DFT-s-OFDM waveform is almost equivalent to the traditional single carrier waveform, but it uses a multi-carrier implementation, so it is easily compatible with OFDM, but its essence is still a single carrier waveform.

[0120] The following uses OFDM waveform as an example to introduce a possible signal processing flow diagram of a network device and a terminal device, wherein one of the network device and the terminal device can be used as a transmitter, and the other device can be used as a receiver.

[0121] like Figure 3 As described above, the transmitting end can convert M consecutive data symbols into M-dimensional data blocks S by 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 OFDM symbols and m represents the sampling point index. Through subcarrier mapping, S k The M symbols carried modulate M of the N subcarriers, and the remaining (NM) subcarriers can be understood as being modulated by 0, resulting in 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 =[xk [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 Therefore, an OFDM symbol contains valid data x k and cyclic prefix (redundant data). In the present 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.

[0122] 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.

[0123] The OFDM symbol is sent to the digital to analog converter (DAC) and the radio frequency (RF) filter for signal transmission. The transmitted signal is transmitted to the receiving end through the channel, 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 to the frequency domain, and 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 The estimated value of .

[0124] 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. The circular convolution can be effectively converted into a frequency domain multiplication operation through FFT, and then the channel equalization can be completed with low complexity using frequency domain single tap equalization.

[0125] Optionally, for DFT-s-OFDM waveforms, Figure 3 On the basis of the transmission process of the OFDM waveform, 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, so in the existing versions of LTE and NR, DFT-s-OFDM is used for uplink transmission.

[0126] Another example Figure 4 FIG. 1 is a schematic diagram of a possible signal processing flow of a network device and a terminal device when a single-carrier frequency domain equalization (SC-FDE) waveform is used, wherein one of the network device and the terminal device can be used as a transmitter, and the other device can be used as a receiver.

[0127] At the transmitting end, a partition module is used to divide a phase shift keying (PSK) symbol (such as a binary phase shift keying (BPSK) symbol, a π / 2-BPSK symbol, a quadrature phase shift keying (QPSK) symbol, etc.) or a 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 of s k (At this time, the CP intercept point corresponds to the symbol index MQ-1). Further shaping filtering is performed, including upsampling and filtering (such as root raised cosine pulse shaping filtering). Finally, the transmitter transmits the generated signal. Due to the addition of CP, the linear convolution of the multipath channel is converted into a circular convolution, and then the receiver can use low-complexity single-tap frequency domain channel equalization.

[0128] in, Figure 4The CP in the figure 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 The CP of the sampled values, where P up Represents the upsampling factor. represents the floor operator. That is, or It can be understood as equal to G.

[0129] It can be 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,

[0130] At present, the design of CP length mainly considers the following factors:

[0131] (1) In order to completely eliminate ISI, the length of the CP is required to be greater than or equal to the maximum delay spread.

[0132] 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 s Indicates the sampling interval. Represents the ceiling operator.

[0133] like Figure 2 As shown, 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 length of a symbol is represented by T symb Therefore, an OFDM symbol contains valid data x k and cyclic prefix (i.e. redundant data).

[0134] 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.

[0135] 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 TCP / 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 effective data x k duration.

[0136] In addition, for SC-FDE waveforms, when non-Nyquist pulses are used, shaped pulses will also introduce ISI. For SC-FDE, DFT-s-OFDM, and OFDM modulation, when the RF filter uses non-Nyquist pulses, filtering will also introduce ISI. In this application, the baseband and RF shaped pulses can be regarded as part of the channel, that is, the maximum delay spread DS includes the multipath introduced by the non-Nyquist pulse.

[0137] (2) Timing error must also be considered when designing CP length.

[0138] Consider the uplink scenario. The base station will inform the UE of the timing advance through the timing advance command, so that the uplink signal arrives at the base station (or access point) at the expected time, and the maximum delay spread DS does not exceed the CP length. For example, the base station will measure any useful uplink signal to determine the propagation delay, and then determine the timing advance. Mathematically, the above requirements can be modeled as:

[0139] 0≤T d -t TA +τ prop ≤T CP ;

[0140] 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 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 Td -t TA +τ prop will be greater than T CP , the symbol will be affected by ISI as well as ICI.

[0141] In the present application, there is an ISI situation such as: part of the components of the previous symbol falls into the receiving window (FFT window) of the current symbol. There is an ICI situation such as: the signal corresponding to some paths (such as the last path) cannot fall completely into the receiving FFT window. It can 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 determined.

[0142] In addition, in order to minimize the negative impact of ISI in the presence of timing errors, the receiver often moves the FFT window position forward. The amount of forward movement is generally 10% to 20% of the CP length, that is, in the absence of timing errors, 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.

[0143] For the coordinated multipoint transmission (CoMP) scenario, the UE and the primary access point can achieve no timing error. Due to the geographical distance between the primary access point and the secondary access point, there is a timing error 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, the symbol will be affected by ISI and ICI. For the sake of convenience, the situation in which the timing error plus the maximum delay spread exceeds the CP length is called super CP in this application.

[0144] Currently, the CP length is described in the 3GPP related protocols as in Indicates the index 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 in the protocol as The formula is:

[0145]

[0146]

[0147] Among them, κ = 64. It can be seen that NR supports two CP lengths, normal CP (NCP) and extended CP (ECP). Among them, the overhead of NCP is about 144 / (2048+144) = 6.6%, while the overhead of ECP is about 512 / (512+2048) = 20%. Therefore, the overhead of ECP is much higher than that of NCP. In addition, NR currently stipulates that NCP or ECP can be used only when μ = 2, that is, the subcarrier spacing is 60kHz, and NCP is used when μ has other values.

[0148] It can be understood that μ is the parameter set configuration index. s In certain cases, the application may use the number of sampling points included in the time length to describe the time length.

[0149] (6)SCP

[0150] For the case of super CP, SCP needs to be added to the symbol so that the CP length can be extended. SCP and CP together serve as equivalent CP. For example Figure 5 As shown, in the two symbols sent serially, the D2 part of the previous symbol k-1 is used as the SCP of the current symbol k, and the SCP and the CP of the current symbol k are used as equivalent CPs.

[0151] For the sake of convenience, the length of the added SCP is recorded as N SCP .

[0152] (7) Punching

[0153] Figure 6 Number (a) in the figure 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 the present 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).

[0154] Puncturing can be understood as replacing the original signal with a new signal. Figure 6As shown in the number (b) in , forward puncturing is considered, and the D2 part in the current symbol replaces the tail part 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 part in the current symbol is exactly the same as the D2 part in 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.

[0155] However, puncturing degrades the demodulation performance of a common data symbol preceding or following a high-importance symbol. In addition, it does not solve the over-CP problem faced by common data symbols. Therefore, how to flexibly configure the guard interval between symbols still needs further research.

[0156] 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 transmitter and a receiver. The transmitter can be a terminal device or a module in a terminal device, and the receiver can be a network device or a module in a network device; or the transmitter can be a network device or a module in a network device, and the receiver can be a terminal device or a module in a terminal device. Figure 7 This method is introduced. Figure 7 In the description, the execution subject is taken as an example that the sending end and the receiving end are the execution subjects. The sending end can be replaced by a terminal device or a terminal apparatus, 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 apparatus, a network device, a network device or an access network device, etc. as needed.

[0157] like Figure 7 As shown, the method may include the following steps:

[0158] S101: The transmitting end obtains a first waveform symbol.

[0159] The first waveform symbol may be used to carry at least one of information, data or reference signals to be sent. The first waveform symbol may be used as a symbol of high importance level or as a symbol of low importance level, without specific limitation.

[0160] In the present application, the SCP of the first waveform symbol is the same as the first symbol component in the first waveform symbol. The symbol component may refer to a portion of the waveform symbol, such as a segment of the waveform symbol. The sameness of two waveform symbols (or signals) means that the lengths and signal amplitudes of the two waveform symbols (or signals) are the same.

[0161] The first symbol component is located at the end of the first waveform symbol. At this time, it can be considered that the first symbol component is formed by puncturing the SCP of the first waveform symbol backward. 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. At this time, the SCP of the first waveform symbol can be obtained by forward puncturing according to the first symbol component.

[0162] 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.

[0163] 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.

[0164] For example Figure 8 As shown, the first waveform symbol can be used as the current symbol, and the waveform symbol before the first waveform symbol is recorded as the second waveform symbol. Figure 8 In the embodiment, the SCP of the first waveform symbol may be located at the end of the second waveform symbol, and the starting position of the CP of the first waveform symbol is the same as the starting position of the first waveform symbol, so that the SCP and the CP serve as equivalent CPs of the first waveform symbol. Or, Figure 8 It can also be considered that the starting position of the SCP of the first waveform symbol is 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.

[0165] Figure 8 In the example of , 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 in the process of sending data at the same time.

[0166] As an example of obtaining the first waveform symbol, the transmitting end 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 the second symbol component does not carry data. In other words, it can be considered that the second waveform symbol is forward punctured according to the first symbol component to improve the demodulation performance of the first waveform symbol, wherein both the first waveform symbol and the second waveform symbol can be used as data symbols.

[0167] For example, the second symbol component is a unique word (UW). The unique word may be generated by inserting a sequence into the DFT input. Exemplarily, the unique word may be an inserted UW sequence, and the UW sequence is, for example, a sequence determined by content, and the UW sequence does not belong to data. Optionally, if the transmitting end is a terminal device, the second symbol component may be configured to the terminal device by the access network device. For example, when the second symbol component is UW, the access network device may configure the position of the UW, the content or length of the UW sequence, and other information to the terminal device.

[0168] 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 or all of the UW. It can also be described as that the length of the UW is equal to the SCP length of the first waveform symbol plus a, where a is a non-negative number. In order to adapt to different resource element (RE) scenarios, the value of a may be related to the number of REs, for example, a may 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.

[0169] It is understandable that in Figure 8 In the example of , the transmitting end can generate the first waveform symbol and the second waveform symbol respectively, that is, the generation time of each waveform symbol is not delayed. In addition, Figure 8 In the example, the FFT window position at the receiving end does not move. This helps reduce interference between users when multiple users are multiplexed.

[0170] The SCP length of the first waveform symbol will be described below in conjunction with an embodiment, which will not be expanded here.

[0171] Another example Fig. 9 As shown, 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 are equivalent to the CP of the first waveform symbol. Fig. 9 As shown, the waveform symbol before the first waveform symbol is the second waveform symbol, and the waveform symbol after the first waveform symbol is the third waveform symbol.

[0172] 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 in the process of sending data at the same time.

[0173] Optional, in Fig. 9In the example shown, 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.

[0174] As Fig. 9 In one implementation, the transmitting end may 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, Fig. 9 The implementation shown 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 according to 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.

[0175] It is understandable that in Fig. 9 In the illustrated embodiment, when the receiving end demodulates the first waveform symbol, the FFT window needs to be shifted back by the SCP length.

[0176] 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 which 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.

[0177] For example Fig.10 As shown, CS is used as the first symbol component in the first waveform symbol. In addition, Fig.10 In the example, the CP of the first waveform symbol is copied from the second symbol component before the CS, that is, the CP of the first waveform symbol is the same as the second symbol component. Fig.10 As shown, the waveform symbol before the first waveform symbol is the second waveform symbol, and the waveform symbol after the first waveform symbol is the third waveform symbol. It can also be considered that CS, i.e., the first symbol component, is located at the beginning of the third waveform symbol, i.e., the starting position of the first symbol component is the same as the starting position of the third waveform symbol.

[0178] As Fig.10 In a possible implementation manner, the third symbol component in the third waveform symbol may be replaced by the first symbol component. Fig. 9Similar to the description in , 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, Fig.10 The implementation shown can achieve CP extension of the first waveform symbol by backward puncturing.

[0179] It is understandable that in Fig.10 In the illustrated embodiment, when the receiving end demodulates the first waveform symbol, the FFT window needs to be shifted back by the SCP length.

[0180] based on Fig. 9 and Fig.10 In the embodiment of the present invention, the demodulation performance of the second waveform symbol (or the first waveform symbol) is not affected, so the demodulation performance is the best. In the implementation, high-importance symbols such as synchronization symbols, reference symbols, and control symbols can be placed in the first symbol, thereby reducing the demodulation delay at the receiving end to enhance the demodulation performance of high-importance symbols. In addition, based on Fig. 9 and Fig.10 In the embodiment, there is no delay between each waveform symbol generated by the transmitting end.

[0181] Optionally, in order to reduce the degradation of demodulation performance caused by puncturing on the punctured symbols, a symbol component or signal that does not carry data may be added after the CP of the punctured symbols. Fig. 9 and Fig.10 As shown, the CP of the third waveform symbol may further include a sixth symbol component, the sixth symbol component is located after the CP of the third waveform symbol, and the sixth symbol component is continuous with the CP of the third waveform symbol, and the sixth symbol component does not carry data. For example, the sixth symbol component may be UW.

[0182] Optionally, if the transmitter 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 location of the UW, the content or length of the UW sequence and other information to the terminal device.

[0183] 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 load size of the data. Wherein, the data includes the data carried by the first waveform symbol, for example, the data can be understood as the data carried by at least one waveform symbol including the first waveform symbol, or understood as all the data in a transmission process.

[0184] The following example illustrates a method for determining the length of the SCP of the first waveform symbol.

[0185] The CP length and delay spread length of the first waveform symbol can be used to determine the amount of excess CP. Among them, 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 bit rate, and the demodulation SNR will increase with the increase in the bit 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.

[0186] Optionally, if the first waveform symbol uses low-order modulation (such as QPSK) or low code rate (such as 1 / 3 code rate) or both, or the required EVM value is large, the first waveform symbol has a certain anti-interference ability, or is described as: even if there is a certain interference at this time, the interference will not cause a significant decrease in 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 lower than the excess CP amount. Generally, the smaller the MCS or the larger the required EVM value or both, the shorter the SCP.

[0187] Optionally, if the first waveform symbol is a high-importance symbol, in order to not affect its demodulation or parameter estimation performance, it is required not to be interfered with or to be interfered with very little, 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.

[0188] In addition, the cost of introducing UW is to reduce spectrum efficiency or increase code rate. The degree of spectrum efficiency reduction or code rate increase is related to the load size of the user data channel. The larger the load, the smaller the degree of spectrum efficiency reduction. Assuming that the user's data channel has a load of 1000 data symbols when there is no UW, and the use of UW reduces the transmission of 10 data, UW brings a 1% frequency domain efficiency loss. If the user's data channel has a load of 100 data symbols when there is no UW, then UW brings a 10% frequency domain efficiency loss at this time. Therefore, when the user's load sent this time 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 load sent this time 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 the load can also be the number of information bits carried by the data channel. The data channel is, for example, PDSCH, PUSCH and / or PSSCH. PDSCH, PUSCH and / or PSSCH can also be called PXSCH.

[0189] In the present application, the waveform symbol may be a symbol obtained through a modulation process at the transmitting end, for example Figure 4 As shown, after the transmitting end performs DFT, subcarrier mapping, IDFT, P-to-S and CP addition operations on the first set, the first waveform symbol is obtained. For example, the waveform symbol is a DFT-s-OFDM symbol or an SC-FDE symbol in the time domain. The length of the waveform symbol can be the same as the sum of the length of a receiving window (such as an FFT window or an IFFT window) of the receiving end and the CP length in the first waveform symbol.

[0190] S102: The transmitting end sends a first waveform symbol. Correspondingly, the receiving end receives the first waveform symbol.

[0191] It can be understood that “the transmitting end sends the first waveform symbol” can also be replaced by “the transmitting end outputs the first waveform symbol”. The output, for example, includes outputting the first waveform symbol through an interface. In this case, a communication device or module independent of the transmitting end can receive the first waveform symbol through the interface and send the first waveform symbol through the air interface.

[0192] like Figure 4Taking the signal transmission process shown as an example, the transmitting end can transmit the wireless signal corresponding to the first waveform symbol through the air interface channel, and 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.

[0193] Among them, at the receiving end, the first waveform symbol can be a symbol obtained by the receiving end through RF, DAC and other operations.

[0194] S103: The receiving end demodulates the first waveform symbol and obtains data carried by the first waveform symbol.

[0195] In various embodiments of the present application, the timing of the puncturing operation and the operation of adding a CP to the punctured waveform symbol can be interchanged. Figures 8 to 10 In the example, the puncturing operation of the punctured waveform symbol is performed after the CP is added, so the CP of the waveform symbol may not be consistent with the end of the waveform symbol. In another implementation, the sending end may first puncture the waveform symbol and then add the CP to the punctured waveform symbol. Figures 11 to 13 Provide explanation.

[0196] As another possible implementation of the present application, if forward puncturing is used, the CP of the previous waveform symbol of 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. Figure 8 Further improvements to the embodiment shown, such as Fig.11 As shown, 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. Figure 8 In the example, the CP of the second waveform symbol does not include the symbol components including the SCP or the first symbol component of the first waveform symbol. Since the end of the second symbol component is replaced by the SCP or the first symbol component of the first waveform symbol, that is, the CP of the second waveform symbol is different from the end of the second waveform symbol, this will cause the demodulation performance of the second waveform symbol to deteriorate. Fig.11 In the example, 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 depends on 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 symbol.

[0197] As another possible implementation of the present application, if backward puncturing is adopted, part of the symbol components of the waveform symbol after the first waveform symbol can be punctured again according to the backward punctured signal to improve the demodulation performance of the punctured waveform symbol. Wherein, the latter waveform symbol can include a symbol component that does not carry data, and the time domain position of the symbol component can 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, and the re-puncturing can mean that a section of the symbol component after the CP interception point is punctured again by the signal.

[0198] Fig.12 Can be used as Fig. 9 An example of punching holes again on the basis of the above. Fig.12 The third waveform symbol before puncturing is the next waveform symbol of the first waveform symbol, and the CP of the third waveform symbol can be obtained according to the symbol component after the CP interception point. In addition, before puncturing, the third waveform symbol includes 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 Fig. 9 In the 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 Fig.12 In the example, the transmitting end may also replace the fifth symbol component after the CP interception point of the third waveform symbol with the fourth symbol component.

[0199] Taking the third waveform symbol before puncturing as an example, the symbol component containing non-data bearing is UW, and 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 the fourth symbol component) of the first waveform symbol, for example, the length of UW is equal to the SCP length of the first waveform symbol plus 2b, where b is a non-negative number. To adapt to different RE scenarios, b may be related to the number of REs, for example, b may be related to 0.5% or 1% of the number of REs.

[0200] Optionally, the distance from the left endpoint of UW to the CP intercept point is b. Fig.12 It can be seen that the fifth symbol component starting from the CP interception point in UW can be replaced by the fourth symbol component. Optionally, when b is greater than 0, the symbol component between the left endpoint of UW and the CP interception point does not carry data, and the symbol component between the right endpoint of the fifth symbol component and the right endpoint of UW does not carry data.

[0201] It can be understood that when the terminal device acts as the transmitting end, the access network device can configure the timing of the punching 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 punching operation and the CP adding operation. For example, configuration field 1 can be used to indicate that the punching 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 punching 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 Figures 8 to 10 In any of the examples in , if the user equipment is the sending end, the access network device may indicate to the user equipment that the CP adding operation is performed before the puncturing operation. Fig. 9 , Fig.10 , Fig.12 or Fig.13 For example, if the user equipment is used as the sending end, the access network device can indicate to the user equipment that the punching operation is performed before the CP adding operation. As another implementation, 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 is defined in the local configuration of the terminal device or through a protocol. Then, the terminal device can determine the order of the punching operation and the CP adding operation according to the predefined order, and no additional configuration of the access network device is required.

[0202] Optionally, if the transmitting 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 the location of the UW, the content or length of the UW sequence, and other information to the terminal device.

[0203] 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 Figure 8 ,or Fig.11 For example, if the user equipment is used as the sending end, the access network equipment can instruct the user equipment to perform forward puncturing. Fig. 9 , Fig.10 , Fig.12 or Fig.13For example, if the user equipment is used as the sending end, the access network device can instruct the user equipment to perform backward puncturing. As another implementation, the puncturing direction can also be predefined, for example, the puncturing direction is defined in the local configuration of the terminal device or through a protocol, and the terminal device can determine the puncturing direction according to the predefined, and no additional configuration of the access network device is required.

[0204] 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 a first waveform symbol using the method in the present application.

[0205] Exemplarily, in uplink transmission, the first configuration information may include at least one of the length and position (such as the 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 refer to the description in the above-mentioned embodiment.

[0206] 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.

[0207] 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.

[0208] 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 the DCI whether there is an SCP for any waveform symbol. 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 the DCI whether there is an SCP for any waveform symbol. In addition, when there is an SCP for the waveform symbol, the access network device may also notify or indicate an SCP length from a plurality of candidate SCP lengths through the 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.

[0209] Another example Fig.13As shown, taking the symbol component of the third waveform symbol containing non-data before puncturing as UW as an example, 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 of the first waveform symbol or the length of the CS or the length of the first symbol component, for example, the length of UW is equal to the length of the SCP of the first waveform symbol plus 2c, where c is a non-negative number. To adapt to different RE scenarios, c may be related to the number of REs, for example, c may be related to 0.5% or 1% of the number of REs.

[0210] Optionally, the distance from the left endpoint of UW to the CP intercept point is c. Fig.13 It can be seen that the fifth symbol component starting from the CP interception point in UW can be replaced by the first symbol component. Optionally, when b is greater than 0, the symbol component between the left endpoint of UW and the CP interception point does not carry data, and the symbol component between the right endpoint of the fifth symbol component and the right endpoint of UW does not carry data.

[0211] Fig.14 The demodulation block error rate (BLER) performance simulation results are given. 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, Fig.14 based on Fig.11 The scheme shown is obtained. It should be understood that the schemes provided in other examples of this application can also be used to verify the gain of demodulation performance. In the comparison, the DMRS symbols all use forward puncturing to extend the CP. Since ZH, ZT and UW will cause spectrum efficiency loss, the spectrum efficiency loss is converted into a code rate increase in the comparison. The SCP length, UW length and ZH / ZT length design are optimized through search.

[0212] Among them, the design using the ZH / ZT scheme includes: the SCP in the DMRS symbol has 66 (if it is PDSCH, it contains 4 symbols) or 96 (if it is PDSCH, it contains 14 symbols) samples. Each data symbol has a ZT, and the ZT length is 36 (if the PDSCH contains 4 symbols) or 78 (if the PDSCH contains 14 symbols) samples. The next symbol of the DMRS symbol has a ZH to resist the interference caused by DMRS, and the ZH length is 36 (if the PDSCH contains 4 symbols) or 78 (if the PDSCH contains 14 symbols) samples.

[0213] For the adoption Fig.11The design of the scheme shown includes: the SCP in the DMRS symbol has 66 (if the PDSCH contains 4 symbols) or 72 (if the PDSCH contains 14 symbols) samples. The SCP length of each data symbol is 48 (if the PDSCH contains 4 symbols) or 36 (if the PDSCH contains 14 symbols) samples. The next symbol of the DMRS symbol has a ZH to resist the interference caused by the DMRS, and the ZH length is 48 (if the PDSCH contains 4 symbols) or 36 (if the PDSCH contains 14 symbols) samples. 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).

[0214] It can be seen that the SCP is not equal to the excess CP amount, that is, 108 samples. In addition, since the DMRS symbol is a high-importance symbol, its SCP length exceeds the SCP length of the data symbol. In addition, the SCP and UW lengths are also related to the payload size (that is, the number of symbols contained in the PDSCH).

[0215] based on Fig.14 It can be seen that whether PDSCH contains 4 symbols or 14 symbols, Fig.11 The BLER performance of the designs shown is better than the baseline scheme using ZH / ZT.

[0216] It is understandable that in order to implement the functions in the above embodiments, the network device and the terminal include hardware structures and / or software modules corresponding to the execution of each function. 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, the present 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

[0217] Fig.15 and Fig.16 The schematic diagram of the structure of possible communication devices provided for 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 method embodiments, and thus can also achieve the beneficial effects possessed by the above method embodiments. Among them, the sending and receiving ends can be used as one of the terminals and network devices respectively. In the embodiments of the present application, the communication device can be such as Figure 1 The terminal device shown may also be Figure 1 The network device shown may also be a module (such as a chip) applied to a terminal device or a network device.

[0218] like Fig.15As shown, the communication device 1500 includes a processing unit 1510 and a transceiver unit 1520. The communication device 1500 is used to implement the above Figure 7 The functions of the sending end or the receiving end in the method embodiment shown in FIG.

[0219] When the communication device 1500 is used to implement Figure 7 The functions of the transmitting end in the method embodiment shown are: the processing unit 1510 or the transceiver unit 1520 can be used to determine and send the first waveform symbol.

[0220] When the communication device 1500 is used to implement Figure 7 The functions of the receiving end in the method embodiment shown are: 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.

[0221] For more detailed description of the processing unit 1510 and the transceiver unit 1520, please refer to Figure 7 The method embodiment shown is described in detail.

[0222] like Fig.16 As shown, the communication device 1600 includes a processor 1610 and an interface circuit 1620. The processor 1610 and the interface circuit 1620 are coupled to each other. It is understood that the interface circuit 1620 can be a transceiver or an input-output interface. Optionally, the communication device 1600 may also include a memory 1630 for storing instructions executed by the processor 1610 or storing input data required by the processor 1610 to execute instructions or storing data generated after the processor 1610 executes instructions.

[0223] When the communication device 1600 is used to implement Figure 7 When the method is shown, the processor 1610 is used to implement the function of the above-mentioned processing unit 1510, and the interface circuit 1620 is used to implement the function of the above-mentioned transceiver unit 1520.

[0224] When the above communication device is a chip applied to UE, the UE chip implements the functions of the transmitting end or the receiving end in the above 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 an antenna); or the UE chip sends information to other modules in the UE (such as a radio frequency module or an antenna), and the information is sent by the UE to the base station.

[0225] When the above-mentioned communication device is a module applied to a base station, the base station module implements the function 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 a baseband chip of a base station, or a CU, DU or other module, or a device under an open radio access network (open radio access network, O-RAN) architecture, such as an open CU, an open DU and other devices.

[0226] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or 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.

[0227] 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 disks, mobile hard disks, CD-ROMs, or any other form of storage medium 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 a component 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 in a base station or an O-RAN as discrete components.

[0228] The present application also provides a computer-readable storage medium, which stores instructions, which may also be referred to as computer programs, computer program codes, etc. The instructions are executed on a computer, so that the computer executes the method in the above embodiment. Figure 7 And the methods shown in various embodiments of this application.

[0229] The present application also provides a computer program product, including a computer program or an instruction. When the computer program or the instruction is executed on a computer, Figure 7 And the methods shown in various embodiments of this application are implemented.

[0230] The present application also provides a chip, which includes a processor, the processor is coupled to a memory, and the processor is used to execute a computer program or instruction stored in the memory, so that Figure 7 The methods shown in the various embodiments of the present application are implemented. For example, taking the chip implementing the function of the access network device as an example, the chip can receive information from other modules of the access network device (such as radio frequency or antenna, etc.), and the information can be sent by the terminal to the access network device. Alternatively, the chip can send information to other modules in the access network device (such as radio frequency or antenna, etc.), and the information is sent by the access network device to the terminal, etc.

[0231] 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.

[0232] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part 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 instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed 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 instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc; it may also be a semiconductor medium, for example, a solid-state hard disk. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0233] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0234] In the present application, "at least one" means one or more, and "more than one" 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 the present application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of the present 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.

[0235] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal 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, 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.

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 includes: 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 includes: 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 according to any one of claims 1 to 18 is implemented, or the method according to any one of claims 19 to 36 is implemented.

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