Signal transmission methods, communication apparatus, storage medium, and program product

Abstract

Provided are signal transmission methods, a communication apparatus, a storage medium and a program product. A method comprises: receiving a PDCCH signal from a second communication apparatus, the PDCCH signal comprising a PDCCH data signal and a PDCCH DMRS, the PDCCH data signal having a DFT-s-OFDM waveform, and the PDCCH data signal and the PDCCH DMRS occupying the same time domain resources and involving non-overlapping frequency domain resources; and demodulating the PDCCH signal. In the described technical solution, the PDCCH data signal has a DFT-s-OFDM waveform, and the DFT-s-OFDM waveform is a single carrier-like waveform and has a relatively low PAPR, such that compared with an OFDM waveform, the DFT-s-OFDM waveform helps to reduce PAPR and further reduce PA output backoff power, thereby improving transmit power and improving coverage.

Description

Signal transmission method, communication apparatus, storage medium and program product

[0001] The present application claims priority from the Chinese patent application No. 202411332568.3 filed on September 20, 2024, and entitled "Signal transmission method, communication apparatus, storage medium and program product", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication, in particular to a signal transmission method, a communication apparatus, a storage medium and a program product. BACKGROUND

[0003] A demodulation reference signal (DMRS) can be used for channel estimation of a physical channel, and demodulation of a data signal, etc. For example, a physical downlink control channel (PDCCH) DMRS can be used for a terminal to demodulate a PDCCH data signal, wherein the PDCCH data signal may, for example, carry downlink control information (DCI).

[0004] At present, a PDCCH data signal and a PDCCH DMRS are carried by an orthogonal frequency division multiplexing (OFDM) waveform (or referred to as a "symbol"), wherein the PDCCH data signal and the PDCCH DMRS are frequency division multiplexed (FDM), i.e., the frequency domain resources occupied by the PDCCH data signal and the PDCCH DMRS do not overlap. The OFDM waveform has a high peak to average power ratio (PAPR), resulting in a relatively large output backoff power of a power amplifier (PA), and thus a relatively low transmit power. SUMMARY

[0005] The present application provides a signal transmission method, a communication apparatus, a storage medium and a program product, so as to reduce the PAPR, reduce the output backoff power of the PA, and thus improve the transmit power and the coverage range.

[0006] In a first aspect, the present application provides a signal transmission method, which can be executed by a first communication device, for example, by the whole machine of the first communication device itself, or by a component (such as a processor, a chip, a chip system, etc.) configured in the first communication device, or by a logic module or software capable of realizing all or part of the functions of the first communication device, which is not limited in the present application.

[0007] The first communication device may, for example, be a terminal, which may, for example, include but is not limited to a mobile phone, a tablet computer or a computer with wireless transceiver function, virtual reality (VR), augmented reality (AR), etc., and the specific type of the terminal is not limited in the present application.

[0008] For example, the method comprises receiving a PDCCH signal from a second communication device, the PDCCH signal comprising a PDCCH data signal and a PDCCH DMRS, the PDCCH data signal having a discrete fourier transform spreading OFDM (DFT-s-OFDM) waveform, the PDCCH data signal and the PDCCH DMRS occupying the same time domain resources and non-overlapping frequency domain resources; and demodulating the PDCCH signal.

[0009] In the above technical solution, the PDCCH data signal has a DFT-s-OFDM waveform, and the DFT-s-OFDM waveform is a kind of single-carrier-like waveform with low PAPR. Therefore, compared with the OFDM waveform, it is beneficial to reduce the PAPR, and then reduce the output back-off power of the PA, so as to improve the transmission power and enhance the coverage. To realize that the PDCCH data signal has a DFT-s-OFDM waveform, the data signal FDMed with the PDCCH DMRS can be obtained by DFT processing on the data carried by the PDCCH data signal.

[0010] In the present application, DFT can also be referred to as transform precoding, and the name thereof is not limited in the present application.

[0011] In a second aspect, the present application provides a signal transmission method, which can be executed by a second communication device, for example, by the whole machine of the second communication device itself, or by a component (such as a processor, a chip, a chip system, etc.) configured in the second communication device, or by a logic module or software capable of realizing all or part of the functions of the second communication device, which is not limited in the present application.

[0012] The second communication device may be, for example, a network device, which may include, but is not limited to, an evolved node B (eNB) in a long term evolution (LTE) system, a next generation NodeB (gNB) in a 5th generation (5G) mobile communication system, or a base station in a future mobile communication system, and the like. The specific type of the network device is not limited in the present application.

[0013] For example, the method comprises: generating a PDCCH signal, the PDCCH signal comprising a PDCCH data signal and a PDCCH DMRS, the PDCCH data signal having a DFT-s-OFDM waveform, the PDCCH data signal and the PDCCH DMRS occupying the same time domain resources and non-overlapping frequency domain resources; and transmitting the PDCCH signal to the first communication device.

[0014] In the above technical solution, the PDCCH data signal has a DFT-s-OFDM waveform, and the DFT-s-OFDM waveform is a kind of single-carrier-like waveform with a low PAPR. Therefore, compared with the OFDM waveform, the DFT-s-OFDM waveform is beneficial to reduce the PAPR, thereby reducing the output back-off power of the PA, improving the transmission power, and enhancing the coverage. To realize that the PDCCH data signal has a DFT-s-OFDM waveform, the data signal FDMed with the PDCCH DMRS may be obtained by performing DFT processing on the data carried by the PDCCH data signal.

[0015] In combination with the first aspect and the second aspect, in some possible implementation manners, the frequency domain resources occupied by the PDCCH received by the first communication device are continuous.

[0016] In the present application, one possible design is that the PDCCH received by the first communication device and other communication devices (such as a third communication device) may be the same, in other words, the PDCCH may be common, or in other words, the PDCCH received by the first communication device and other communication devices is located in a common search space. Another possible design is that the PDCCH received by the first communication device and other communication devices (such as a third communication device) may also be different, in other words, the PDCCH may be specific, or in other words, the PDCCH received by the first communication device is located in a specific search space.

[0017] The frequency domain resources occupied by the PDCCH received by the first communication device are continuous, which helps to simplify the decoding process and improve decoding efficiency. In addition, in the case where the second communication device (such as a network device) knows the downlink wireless channel in advance (especially in the time division duplex mode, the downlink wireless channel is obtained through uplink channel estimation according to channel reciprocity), the network device can schedule the PDCCH signal to the time-frequency resource with better channel quality, thereby obtaining scheduling gain.

[0018] In combination with the first aspect and the second aspect, in some possible implementation manners, the frequency domain resources occupied by the PDCCH DMRS include P subcarriers, and intervals between any two adjacent subcarriers in the P subcarriers are equal, that is, the PDCCH DMRS is uniformly placed.

[0019] P is a positive integer. For example, P can be a positive integer greater than or equal to 6, which is not limited in the present application.

[0020] By uniformly placing the PDCCH DMRS, it is helpful to better perform channel estimation and improve channel estimation performance.

[0021] In combination with the first aspect and the second aspect, in some possible implementation manners, the frequency domain resources occupied by the PDCCH received by the first communication device include Q subcarriers, and an offset δ of a first subcarrier in the P subcarriers relative to a first subcarrier in the Q subcarriers is related to a first parameter, the first parameter being one or more of the following: an identifier of the first communication device, a cell identifier, a bandwidth part (BWP) identifier, a frame index, a subframe index, a slot index, or an OFDM symbol index.

[0022] Q is a positive integer, and Q is greater than or equal to P.

[0023] By associating the offset of the first subcarrier in the P subcarriers relative to the first subcarrier in the Q subcarriers with the first parameter, it is helpful to reduce the possibility that the DMRS corresponding to different PDCCHs are all allocated on the same subcarrier, and thus it is helpful to reduce co-frequency interference. For example, in the same cell, the identifier of the terminal (an example of the first communication device) of user 1 is different from the identifier of the terminal of user 2, and thus the subcarriers where the PDCCH DMRS corresponding to the two terminals are located are also different, which is helpful to reduce co-frequency interference. For another example, the cell identifiers of different cells are different, and thus the subcarriers where the PDCCH DMRS corresponding to the different cells are located are also different, which is helpful to reduce inter-cell co-frequency interference. Here, it is not listed one by one.

[0024] In a possible implementation, the offset δ satisfies the following relationship: δ = X mod Δ, where X is calculated based on the first parameter, Δ represents a spacing between any two adjacent subcarriers in the P subcarriers, and mod represents a modulo operation.

[0025] With reference to the first aspect and the second aspect, in some possible implementations, the PDCCH received by the first communication apparatus occupies a plurality of non-contiguous frequency domain subblocks, a spacing between any two adjacent frequency domain subblocks in the plurality of non-contiguous frequency domain subblocks is equal, and each frequency domain subblock includes subcarriers for carrying the PDCCH DMRS.

[0026] That is, the frequency domain resources occupied by the PDCCH received by the first communication apparatus are non-contiguous, which facilitates obtaining frequency diversity gain.

[0027] On the other hand, the plurality of non-contiguous frequency domain subblocks are equally spaced, each frequency domain subblock in the plurality of non-contiguous frequency domain subblocks is of equal size, and the relative positions of the subcarriers occupied by the PDCCH DMRS in each frequency domain subblock are fixed, which is equivalent to equally spacing the PDCCH DMRS, and thus facilitates better channel estimation and improves channel estimation performance.

[0028] With reference to the first aspect and the second aspect, in some possible implementations, an index γ of a first subcarrier in at least one subcarrier occupied by the PDCCH DMRS in each frequency domain subblock is related to a second parameter, and the second parameter is one or more of the following: an identifier of the first communication apparatus, a cell identifier, a BWP identifier, a frame index, a subframe index, a slot index, or an OFDM symbol index.

[0029] By associating the position of the first subcarrier in the at least one subcarrier occupied by the PDCCH DMRS in each frequency domain subblock with the second parameter, it is possible to reduce the possibility that the DMRS of different PDCCHs are allocated on the same subcarrier, and thus it is possible to reduce co-frequency interference. For example, if the cell identifiers of different cells are different, the subcarriers on which the PDCCH DMRS of the different cells are located are also different, and thus it is possible to reduce inter-cell co-frequency interference.

[0030] In a possible implementation, the index γ of the first subcarrier in the at least one subcarrier occupied by the PDCCH DMRS in each frequency domain subblock satisfies the following relationship: γ = Y mod K, where Y is calculated based on the second parameter, K represents a number of subcarriers included in one frequency domain subblock, and mod represents a modulo operation.

[0031] In some possible implementation manners, the interval between any two adjacent frequency domain sub-blocks in the plurality of non-continuous frequency domain sub-blocks is n*K, where K represents the number of subcarriers included in one frequency domain sub-block, and n represents the maximum number of PDCCHs in frequency division.

[0032] It can be understood that when the dedicated PDCCH is considered, n can also represent the maximum number of users in frequency division. Through the plurality of PDCCH frequency divisions, resource fragmentation is effectively reduced, and the frequency domain resource utilization rate is improved.

[0033] In some possible implementation manners, the PDCCH data signal includes a plurality of first PDCCH data signals, and the plurality of first PDCCH data signals are time division multiplexed; and / or, the plurality of first PDCCH data signals are frequency division multiplexed.

[0034] The plurality of first PDCCH data signals can correspond to one communication device (for example, the first communication device), in other words, the PDCCH data signal includes the PDCCH data signal received by the first communication device; the plurality of first PDCCH data signals can also correspond to a plurality of communication devices (for example, the first communication device and the third communication device), in other words, the PDCCH data signal includes the PDCCH data signal received by the first communication device, and can also include the PDCCH data signal received by the third communication device.

[0035] The plurality of first PDCCH data signals can be time division multiplexed, which is beneficial to reducing the PAPR of the PDCCH signal and obtaining the frequency selection diversity gain corresponding to the frequency domain resource occupied by the PDCCH. The plurality of first PDCCH data signals can also be frequency division multiplexed, which is beneficial to independent demodulation of the plurality of first PDCCH data signals and reducing the time delay.

[0036] In some possible implementation manners, the frequency division multiplexing between the plurality of first PDCCH data signals is implemented based on an orthogonal cover code (OCC); and the OCC is related to one or more of the following: the interval between any two adjacent subcarriers occupied by the PDCCH DMRS, and the relative position of the frequency domain resource occupied by the PDCCH DMRS.

[0037] The OCC is related to the interval between any two adjacent subcarriers occupied by the PDCCH DMRS, which means that the length of the OCC is related to the interval between any two adjacent subcarriers occupied by the PDCCH DMRS.

[0038] The OCC is related to the relative position of the frequency domain resources occupied by the PDCCH DMRS, that is, after the OCC length is determined, the code word is related to the relative position of the frequency domain resources occupied by the PDCCH DMRS. For example, the OCC cannot make any one of the plurality of first PDCCH data signals be non-zero at the DMRS resource element (RE) position.

[0039] In combination with the first aspect and the second aspect, in some possible implementation manners, the time division multiplexing is implemented before DFT.

[0040] In combination with the first aspect and the second aspect, in some possible implementation manners, the PDCCH DMRS is generated based on a low PAPR sequence. By generating the PDCCH DMRS by using the low PAPR sequence, the PAPR of the PDCCH signal is reduced, the output back-off power of the PA is reduced, the transmission power is improved, and the coverage is improved.

[0041] In some possible implementation manners, the PDCCH DMRS is generated based on a Zadoff-Chu (ZC) sequence, and the Zadoff-Chu sequence is an example of the low PAPR sequence.

[0042] The third aspect provides a communication apparatus, so that the method in the first aspect and any possible implementation manner of the first aspect is implemented, or so that the method in the second aspect and any possible implementation manner of the second aspect is implemented. The apparatus includes corresponding modules for performing the above method. The modules included in the apparatus can be implemented in a software and / or hardware manner.

[0043] The fourth aspect provides a communication apparatus, which includes a processor. The processor can be used to execute a computer program in a memory, so that the method in the first aspect and any possible implementation manner of the first aspect is implemented, or so that the method in the second aspect and any possible implementation manner of the second aspect is implemented.

[0044] Optionally, the apparatus further includes a communication interface, and the processor is coupled with the communication interface. The communication interface is configured to receive a signal from another communication apparatus outside the apparatus and transmit the signal to the processor, or send a signal from the processor to another communication apparatus outside the apparatus. Exemplarily, the communication interface can be a transceiver, a circuit, a bus, a module or other types of communication interfaces.

[0045] Optionally, the apparatus further includes a memory, and the processor is coupled with the memory. The memory is configured to store program instructions and data.

[0046] In a fifth aspect, the present application provides a computer readable storage medium, which stores a computer program or instructions, when the computer program or instructions are executed by a computer, the method in the first aspect and any possible implementation manner of the first aspect is executed, or the method in the second aspect and any possible implementation manner of the second aspect is executed.

[0047] In a sixth aspect, the present application provides a computer program product, which comprises a computer program (also referred to as code or instructions), when the computer program is executed, the method in the first aspect and any possible implementation manner of the first aspect is executed, or the method in the second aspect and any possible implementation manner of the second aspect is executed.

[0048] In a seventh aspect, the present application provides a chip system, which comprises at least one processor, used for supporting the functions in the first aspect and any possible implementation manner of the first aspect, or used for supporting the functions in the second aspect and any possible implementation manner of the second aspect, for example, receiving or processing the data in the method.

[0049] In a possible design, the chip system further comprises a memory, used for storing program instructions and data, and the memory is located in the processor or outside the processor.

[0050] The chip system can be composed of a chip, or can comprise a chip and other discrete devices.

[0051] In an eighth aspect, the present application provides a communication system, which comprises a first communication device and a second communication device, wherein the first communication device is used for implementing the method in the first aspect and any possible implementation manner of the first aspect, and the second communication device is used for implementing the method in the second aspect and any possible implementation manner of the second aspect.

[0052] It should be understood that the third aspect to the eighth aspect of the present application correspond to the technical solutions of the first aspect and the second aspect of the present application, and the beneficial effects obtained by each aspect and the corresponding possible implementation manner are similar, which will not be repeated. BRIEF DESCRIPTION OF DRAWINGS

[0053] FIG. 1 is a schematic diagram of an architecture of a communication system suitable for the method provided by the embodiments of the present application;

[0054] FIG. 2 is a schematic diagram of an amplitude modulation-amplitude modulation curve provided by the embodiments of the present application;

[0055] FIG. 3 is a schematic diagram of an OFDM provided by the embodiments of the present application;

[0056] FIG. 4 is a schematic diagram of a relationship among a PDCCH, a control channel element (CCE) and a resource element group (REG) according to an embodiment of the present application;

[0057] FIG. 5 is a schematic diagram of a REG indexing rule according to an embodiment of the present application;

[0058] FIG. 6 is a schematic flowchart of a signal transmission method according to an embodiment of the present application;

[0059] FIG. 7 is a schematic diagram of introducing DFT according to an embodiment of the present application;

[0060] FIG. 8 is a schematic diagram of PDCCH DMRS distribution according to an embodiment of the present application;

[0061] FIG. 9 is a schematic diagram of a frequency domain sub-block according to an embodiment of the present application;

[0062] FIG. 10 is a schematic diagram of time division multiplexing among a plurality of first PDCCH data signals according to an embodiment of the present application;

[0063] FIG. 11 is a schematic diagram of frequency division multiplexing among a plurality of first PDCCH data signals according to an embodiment of the present application;

[0064] FIG. 12 is another schematic diagram of frequency division multiplexing among a plurality of first PDCCH data signals according to an embodiment of the present application;

[0065] FIG. 13 is a schematic diagram of implementing frequency division multiplexing based on OCC according to an embodiment of the present application;

[0066] FIG. 14 is a schematic block diagram of a communication apparatus according to an embodiment of the present application;

[0067] FIG. 15 is another schematic block diagram of a communication apparatus according to an embodiment of the present application. DETAILED DESCRIPTION

[0068] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0069] To facilitate understanding of the embodiments of the present application, the following explanations are first made:

[0070] First, in order to facilitate clear description of the technical solutions provided in the present application, in the present application, "first", "second" and the like are used to distinguish functionally and functionally the same or similar items. For example, the first communication device and the second communication device are only used to distinguish different communication devices, and do not limit the order. Those skilled in the art can understand that "first", "second" and the like do not limit the number and execution order, and "first", "second" and the like do not necessarily mean different.

[0071] Second, in the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after, but does not exclude the case where the associated objects before and after represent an "and" relationship. The specific meaning can be understood in conjunction with the context. "At least one of the following" or the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c, can mean a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, and c can be single or multiple.

[0072] Third, in the present application, "when", "if" and "if" all mean that the device will make corresponding processing under certain objective circumstances, not limited to time, and does not require the device to have a judgment action when implemented. Also does not mean that there are other limitations.

[0073] Fourth, in the present application, "B corresponding to A" or "B corresponding to A" means that B is associated with A. "Determining B according to A" does not mean that B is determined only according to A, but also can be determined according to A and / or other information.

[0074] Fifth, in the present application, "send" and "receive" represent the direction of signal transmission. For example, "sending information to the first communication device" can be understood as the destination of the information being the first communication device, which can include direct transmission through the air interface, or indirect transmission through the air interface by other units or modules. "Receiving information from the second communication device" can be understood as the source of the information being the second communication device, which can include direct reception from the second communication device through the air interface, or indirect reception from the second communication device through the air interface from other units or modules. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface.

[0075] In other words, the sending and receiving can be between communication devices, such as between the second communication device and the first communication device, or can be within a communication device, such as between components, modules, chips, software modules or hardware modules within the communication device via a bus, wire or interface.

[0076] It can be understood that the information can be processed as necessary before being sent by the source to the destination, such as encoding, modulation, etc., and the destination can also perform corresponding processing after receiving the information from the source, such as decoding, demodulation, etc., so as to interpret the effective information from the source. Similar expressions in this application can be similarly understood, and will not be repeated.

[0077] Sixth, the scheme provided by the application can be applied to various communication systems, such as non-terrestrial network (NTN) communication system, internet of things (IoT) system, device to device (D2D) communication system, vehicle-to-everything (V2X) communication system, machine to machine (M2M) communication system, machine type communication (MTC) system, LTE system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunications system (UMTS), 5G mobile communication system, new radio (NR) system or future communication system, etc.

[0078] Seventh, in this application, the network device can be a device capable of communicating with the terminal, or a device providing a wireless communication function service. The network device can also be referred to as a radio access network (RAN) device or an access network device. The radio access network device includes but is not limited to: eNB in LTE system, radio network controller (RNC), node B (NB), base station controller (BSC), home evolved NodeB (or home Node B, HNB), baseband unit (BBU), transmission reception point (TRP), transmitting point (TP), base transceiver station (BTS), etc., gNB in 5G communication system, base station in future communication system, access node in wireless fidelity (Wi-Fi) system, wireless relay node, wireless backhaul node, etc. The network device can also be a wireless controller in a cloud radio access network (CRAN) scenario, a relay station, a vehicle-mounted device, a wearable device, and a network device in future evolution network, etc.

[0079] In a network structure, the radio access network device can be assisted by multiple RAN nodes to implement wireless access for the terminal, and different RAN nodes implement part of the functions of the base station respectively. For example, the RAN node can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and the DU can be separately arranged, or can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a radio frequency remote unit (RRU), an active antenna processing unit (AAU), or a remote radio head (RRH).

[0080] The radio access network device can be deployed on land, including indoor or outdoor; it can also be deployed in the air, such as on an airplane, a balloon, a satellite, etc.

[0081] In the embodiments of the present application, the apparatus for implementing the functions of the radio access network can be a radio access network device; it can also be an apparatus capable of supporting the radio access network device to implement the corresponding functions, such as a chip system, a communication module, or a modem, etc., which can be installed in the radio access network device. The chip system can be composed of a chip, or can include a chip and other discrete devices. The embodiments of the present application do not limit the specific technology and specific device form adopted by the radio access network device.

[0082] Eighthly, in the present application, the terminal can be a device with wireless transceiving function. The terminal can also be referred to as a terminal device, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc., which can be an entity on the user side for receiving or transmitting signals, such as a mobile phone. The terminal includes a handheld device, a vehicle-mounted device, a wearable device, or a computing device with wireless communication function. Exemplarily, the terminal can be a mobile phone, a tablet computer, or a computer with wireless transceiving function. The terminal can also be a wireless terminal in VR, AR, industrial control, autonomous driving, remote medical treatment, smart power grid, smart city, smart home, etc. The terminal can be widely applied to various scenarios, such as D2D communication, V2X communication, MTC, IoT, virtual reality, augmented reality, industrial control, autonomous driving, remote medical treatment, smart power grid, smart home, smart office, smart wear, smart transportation, smart city, etc.

[0083] The terminal can be deployed on land, including indoor or outdoor, handheld, wearable, or vehicle-mounted; can also be deployed on water surface, such as a ship, etc.; and can also be deployed in the air, such as an airplane, a balloon, and a satellite, etc.

[0084] In the embodiments of the present application, the apparatus for implementing the functions of the terminal can be a terminal; it can also be an apparatus capable of supporting the terminal to implement the functions, such as a chip system, or a communication module, or a modem, etc., which can be installed in the terminal. The chip system can be composed of a chip, or can include a chip and other discrete devices. The present application does not limit the specific technology and specific device form adopted by the terminal.

[0085] To make the signal transmission method provided by the embodiments of the present application more comprehensible, the system architecture of the signal transmission method provided by the embodiments of the present application will be described below. It can be understood that the system architecture described in the embodiments of the present application is for more clearly explaining the technical solutions of the embodiments of the present application, and does not constitute a limitation on the technical solutions provided by the embodiments of the present application.

[0086] FIG. 1 is a schematic diagram of the architecture of a communication system applicable to the method provided by the embodiments of the present application.

[0087] As shown in FIG. 1, the communication system can include at least one network device, such as the network device 111, the network device 112, and the network device 113 shown in FIG. 1. The communication system can also include at least one terminal, such as the terminal 121, the terminal 122, the terminal 123, the terminal 124, the terminal 125, the terminal 126, and the terminal 127 shown in FIG. 1.

[0088] Communication can be performed between the network devices and the terminals. For example, multi-site transmission, such as the network device 112 and the network device 113, can communicate with the terminal 124, as shown in FIG. 1. For another example, eMBB transmission, such as the network device 112, can communicate with the terminal 121, the terminal 122, and the terminal 123, as shown in FIG. 1.

[0089] Communication can also be performed between the network devices, such as backhaul, such as the network device 111, the network device 112, and the network device 113, can communicate with each other, as shown in FIG. 1.

[0090] Communication can also be performed between the terminals, such as D2D transmission, such as the terminal 122 can communicate with the terminal 125, as shown in FIG. 1.

[0091] It should be understood that the above-mentioned FIG. 1 is only an example, and should not constitute any limitation on the present application. For example, more or fewer network devices can be included in the communication system shown in FIG. 1, and the corresponding terminals under each network device can also be other numbers.

[0092] The signal transmission method described below in the present application can be applicable to the transmission between the network devices and the terminals, for example, the first communication apparatus can be a terminal, and the second communication apparatus can be a network device.

[0093] In order to better understand the method provided by the embodiments of the present application, the terms involved in the present application will be briefly described below.

[0094] 1、PA: The signal will pass through PA to improve the signal power before being transmitted through the antenna. The amplitude modulation (AM)-AM and AM-phase modulation (PM) of PA can describe the PA behavior.

[0095] Figure 2 is a schematic diagram of the amplitude modulation-amplitude modulation curve provided by the embodiment of the application.

[0096] As shown in Figure 2, the output power of the PA can be a function of the input power. The PA has a linear operating region, in which the output power of the PA increases linearly with the input power, which can also be understood as the PA gain (i.e. the ratio of the PA output power and the input power) remains unchanged, or the AM-AM curve slope remains unchanged. With the continuous increase of the input power, the PA enters the nonlinear region, the output power no longer increases linearly with the input power, the gain appears compression, or the AM-AM curve slope decreases. When the saturation output power is reached, i.e. the output power no longer increases with the increase of the input power, the slope is 0.

[0097] The influence of this nonlinear characteristic of the PA on the transmitted signal is manifested as in-band distortion and out-of-band distortion. The in-band distortion mainly manifests as the distortion of the signal in amplitude and phase, which deteriorates the signal demodulation / detection performance. The out-of-band distortion mainly manifests as signal spectrum expansion / regeneration, which will increase the interference to the adjacent channel users. In order to reduce the influence of PA nonlinearity, the power of the input signal can be appropriately reduced, which can be called input backoff (IBO) or output backoff (OBO), so that the PA works as much as possible in the linear region.

[0098] 2、PAPR: Refers to the ratio of peak power to average power. For a signal x(t), the peak power of the signal in a certain time interval (such as t0 to t1) is and the average power is The PAPR can be expressed as: in decibels (dB).

[0099] The communication signal (such as an OFDM, DFT-s-OFDM signal) is a random signal, the average power of which can be regarded as a fixed value, and the peak power is indeed a random variable. Therefore, the PAPR is also a random variable. In statistics, the value of a random signal at a certain time is often described by a probability density function. Therefore, in the communication industry, the PAPR can be described by a complementary cumulative distribution function (CCDF) curve: the probability that the instantaneous power exceeds the average power xxdB is y, or the proportion of time that the instantaneous power exceeds the average power xxdB in the total time is y. For example, it can be expressed by the following formula:

[0100] Where p(·) represents the probability. The higher the PAPR of the PA input signal x(t), the greater the range of input power fluctuation, and the more power value needs to be backed off to ensure that the signal is in the linear region. Correspondingly, the lower the PAPR of the PA input signal x(t), the less power value needs to be backed off, the greater the transmit power, and the greater the coverage.

[0101] 3. OFDM: a multicarrier modulation technology widely used in wireless communication systems, the process of which mainly includes multiple steps such as serial-to-parallel (S / P) conversion, subcarrier mapping (also known as subcarrier modulation), subcarrier inverse mapping (also known as subcarrier demodulation), parallel-to-serial conversion, and cyclic prefix (CP) addition. The process of OFDM will be explained in detail below in conjunction with FIG. 3. FIG. 3 is a flowchart of the process of OFDM according to an embodiment of the present application.

[0102] First, the process of the sending end will be described in detail. As shown in FIG. 3, at the sending end, the serial-to-parallel (S / P) conversion module is used to convert M consecutive data S(kM), S(kM+1), …, S(kM+M-1) into an M-dimensional data block S k = [S(kM), S(kM+1), …, S(kM+M-1)] T , where the subscript k represents the OFDM symbol index, and [·] T represents transposition.

[0103] The subcarrier mapping module is used to modulate the M data carried by S k onto N sc subcarriers of the N subcarriers, where N sc =M, and the remaining (N-N sc) subcarriers can be understood as being modulated by data 0. It can be understood that after subcarrier mapping, an N-dimensional data vector X k is obtained, where N represents the number of IDFT transform points.

[0104] N sc may represent the number of subcarriers within the transmission bandwidth. In the foregoing, N sc =M. It should be understood that N sc may also be greater than M. For example, a sequence S k of length M can be expanded in sequence, and it is assumed that the length of the expanded sequence is equal to N sc , at which time N sc ≥M.

[0105] In this application, S k may include modulation symbols and / or redundant signal sampling points. The modulation symbols can be modulation symbols obtained by modulating a (coded) bit stream. The modulation method can include pulse amplitude modulation (PAM), phase shift keying (PSK), quadrature amplitude modulation (QAM), or amplitude phase shift keying (APSK), etc.

[0106] The redundant signal sampling points can include phase tracking reference signal (PTRS) sampling points, DMRS, tone reservation signals, etc.

[0107] The N-point IDFT module is used to convert the above N-dimensional data vector X k into a set of N complex time domain sampling points x k =[x k (0), x k (1), …, x k (N-1)]. Wherein, n=0, 1, …, N-1. Wherein, X k (n') represents the output of the subcarrier mapping module, n'=0, 1, …, N-1, e represents Euler's constant, j represents the imaginary unit, j2=-1. Exemplarily, the subcarrier mapping rule is as follows:

[0108] n0 is an integer, S k (l) is the lth element of S k , l=0, 1, …, N sc -1.

[0109] Optionally, in the present application, when the transform point number N satisfies a preset condition, such as N is 2, 3, or a power of 5, the IDFT can also be implemented by an efficient inverse fast fourier transform (IFFT). Correspondingly, the DFT can also be implemented by a fast fourier transform (FFT). In the present application, IDFT and IFFT can be interchangeable, and DFT and FFT can be interchangeable.

[0110] The CP adding module is used to insert a guard interval at the start position of an OFDM symbol, so as to reduce inter-symbol interference (ISI) caused by multipath propagation (a propagation phenomenon in which a radio signal reaches a receiving end through two or more paths). For example, the guard interval is obtained by adding a CP at the start position of an OFDM symbol. One possible implementation is to copy the last G sampling points of x k and attach them at the start position of x k , to obtain the time-domain OFDM signal Therefore, one OFDM symbol contains valid data x k and a cyclic prefix (which can be regarded as redundant data).

[0111] The digital-to-analog converter (DAC) module is used to convert a digital signal into an analog signal.

[0112] The sending end sends a signal through a channel, and correspondingly, the receiving end receives the signal. The process of the receiving end will be described in detail below.

[0113] At the receiving end, the OFDM signal is demodulated by inverse processing. The analog-to-digital converter (ADC) module is used to convert an analog signal into a digital signal. The CP removing module is used to remove the first G sampling points in the received signal, and after removing the CP, a data block containing N sampling points without ISI is obtained. After removing the cyclic prefix, the received time-domain signal can be expressed as the cyclic convolution of the OFDM symbol x k and the channel impulse response.

[0114] The N-point DFT module is used to convert the cyclic convolution into frequency-domain point multiplication, and then utilize frequency-domain single-tap equalization to complete channel equalization.

[0115] The subcarrier inverse mapping module is used to restore the modulation information carried on the equalized subcarriers into the original bit stream.

[0116] In FIG. 3, the steps shown in the dashed box are added, which can be referred to as DFT-s-OFDM. DFT-s-OFDM defines a data block s k That is, an additional DFT process is added before the OFDM processing process, that is, for each data block s k containing M data, an M-point DFT operation is performed to obtain S k Through this operation, x k has a DFT-s-OFDM waveform. The DFT-s-OFDM waveform can be regarded as a kind of single-carrier waveform, and the PAPR is smaller than that of the OFDM waveform. Therefore, by using the DFT-s-OFDM waveform, the output backoff power can be reduced, the transmission power can be improved, and the coverage range can be improved.

[0117] s k may include modulation symbols and / or redundant signal sampling points. The modulation symbols can be modulation symbols obtained by modulating a (coded) bit stream. The modulation method can include PAM, PSK, QAM, offset quadrature amplitude modulation (OQAM), or APSK, etc.

[0118] The redundant signal sampling points can include PTRS sampling points, unique words, or zeros, etc.

[0119] 4, binary phase shift keying (BPSK) (π / 2-BPSK), quadrature phase shift keying (QPSK), and QAM: QSPK can also be referred to as 4QAM.

[0120] For example, the BPSK modulation mapper can map the i-th bit b(i) to the i-th BPSK symbol d(i) according to the following formula:

[0121] For example, the π / 2-BPSK modulation mapper can map the i-th bit b(i) to the i-th π / 2-BPSK symbol d(i) according to the following formula:

[0122] where mod denotes a modulo operation. As can be seen from the above equation, there is only a 90-degree phase jump between two adjacent π / 2-BPSK symbols in a π / 2-BPSK symbol sequence, for example, if the current symbol is 0 degree, the next symbol can only be 90 degrees or 270 degrees (phase jump 90 degrees); if the current symbol is 180 degrees, the next symbol can only be 270 degrees or 90 degrees (phase jump 90 degrees).

[0123] Another example, a QPSK modulation mapper can map two consecutive bits into one QPSK symbol, and the mapping is as follows:

[0124] where b(2i) and b(2i+1) represent the 2i-th and 2i+1-th bits respectively, and d(i) represents the i-th QPSK symbol.

[0125] Yet another example, a 16QAM modulation mapper can map four consecutive bits into one 16QAM symbol, and the mapping is as follows:

[0126] where b(4i), b(4i+1), b(4i+2) and b(4i+3) represent the 4i-th, 4i+1-th, 4i+2-th and 4i+3-th bits respectively, and d(i) represents the i-th 16QAM symbol.

[0127] It should be understood that in future communication systems, bit mapping schemes such as π / 2-BPSK, QSPK and QAM can also be implemented in other ways, and the present application does not limit the specific mapping scheme.

[0128] 5、RE, resource block (RB) and REG are units used to describe the allocation of wireless resources.

[0129] where RE is the smallest resource unit, representing the combination of one OFDM symbol in the time domain and one subcarrier in the frequency domain.

[0130] One RB contains a plurality of frequency-domain continuous subcarriers. In NR, one RB contains 12 subcarriers.

[0131] REG is usually used for resource allocation of PDCCH. In 5G NR, one REG represents the combination of one OFDM symbol in the time domain and one RB in the frequency domain.

[0132] 6、PDCCH: a channel used for transmitting DCI. The DCI mainly includes physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) transmission resource scheduling information, and can also include power control commands, time slot format indications, etc. The PDCCH will be explained in detail below in combination with FIG. 4 and FIG. 5.

[0133] A PDCCH is transmitted on several consecutive CCEs or several CCEs are aggregated into a PDCCH, and the number of CCEs aggregated into the PDCCH is the aggregation level (AL). The aggregation level supported in NR is 1, 2, 4, 8, and 16. The network can dynamically configure the size of the aggregation level. For example, when transmitting a PDCCH, the specific AL can be determined according to the actual wireless channel environment. When the wireless channel environment is relatively poor, a large aggregation level can obtain better demodulation performance. When the wireless channel environment is good, a small aggregation level is used.

[0134] FIG. 4 is a schematic diagram of the relationship between the PDCCH, CCE, and REG provided by the embodiments of the present application. In FIG. 4, the PDCCH includes two CCEs as an example.

[0135] As shown in a) of FIG. 4, a PDCCH includes two CCEs, and a CCE includes six REGs. As shown in b) of FIG. 4, a REG occupies one OFDM symbol in the time domain and one RB in the frequency domain, or in other words, a REG includes 12 REs (located in the same symbol and occupying 12 consecutive subcarriers in the frequency domain). Of the 12 REs, three REs are used to carry DMRS, and the remaining nine REs are used to carry data signals (such as DCI).

[0136] The number of OFDM symbols occupied by the PDCCH can be indicated by the indication in the control resource set (CORESET). The number of RBs occupied by the PDCCH can be indicated by the indication in the CORESET.

[0137] FIG. 5 is a schematic diagram of the arrangement rule of the REG index provided by the embodiments of the present application.

[0138] As shown in a) of FIG. 5, when the PDCCH includes two CCEs, the REG index of the PDCCH is arranged as follows. When the PDCCH occupies one OFDM symbol in the time domain (i.e., single-symbol PDCCH), the indexes of the REGs are arranged from low to high in the frequency domain, as shown in b) of FIG. 5. When the PDCCH occupies multiple OFDM symbols in the time domain (e.g., the PDCCH occupies two OFDM symbols in the time domain in the figure), the indexes of the REGs are arranged in the order of time domain first and then frequency domain.

[0139] It can be understood that, in the following embodiments, mainly (i.e., single-symbol PDCCH, or the PDCCH occupies one OFDM symbol in the time domain).

[0140] 7. DMRS: can be used for channel estimation. Except for the random access channel (PRACH), each NR physical channel has a DMRS distributed in the corresponding resource. For example, PDCCH DMRS, PDSCH DMRS, or PUSCH DMRS. For example, the PDCCH DMRS can be used for channel estimation of the PDCCH.

[0141] As mentioned above, the signals transmitted on the PDCCH include PDCCH data signals and PDCCH DMRS. At present, the PDCCH data signals and the PDCCH DMRS are carried based on the OFDM waveform, wherein the PDCCH data signals and the PDCCH DMRS adopt FDM, i.e., the frequency domain resources occupied by the PDCCH data signals and the PDCCH DMRS do not overlap. The OFDM waveform has a high PAPR, which causes the output backoff power of the PA to be high, and thus the transmission power is low.

[0142] Therefore, the present application provides a signal transmission method. The second communication device transmits a PDCCH signal, and the PDCCH signal includes PDCCH data signals and PDCCH DMRS. Correspondingly, the first communication device receives the PDCCH signal. The PDCCH data signals have a DFT-s-OFDM waveform, and the DFT-s-OFDM waveform is a kind of single-carrier waveform, which has a low PAPR. Therefore, compared with the OFDM waveform, the DFT-s-OFDM waveform is beneficial to reduce the PAPR, and thus reduce the output backoff power of the PA, so as to improve the transmission power and the coverage range.

[0143] The signal transmission method provided by the present application will be described in detail below with reference to the accompanying drawings. The method is described below by taking the interaction between a network device and a terminal as an example, which should not constitute any limitation on the present application. The network device can also be replaced by a component (such as a chip, a chip system, a processor, etc.) configured in the network device, or a logic module or software capable of realizing all or part of the functions of the network device. The terminal can also be replaced by a component (such as a chip, a chip system, a processor, etc.) configured in the terminal, or a logic module or software capable of realizing all or part of the functions of the terminal. The network device is an example of a second communication device, and the terminal is an example of a first communication device.

[0144] FIG. 6 is a schematic flowchart of a signal transmission method 600 provided by an embodiment of the present application. The method 600 shown in FIG. 6 includes steps 610 to 630. Each step in the method 600 will be described in detail below.

[0145] In step 610, the network device generates a PDCCH signal, which includes a PDCCH data signal and a PDCCH DMRS, the PDCCH data signal having a DFT-s-OFDM waveform.

[0146] The PDCCH signal refers to a signal transmitted on the PDCCH. In the present application, receiving a PDCCH signal and receiving a PDCCH can be replaced, and have the same meaning, for example, receiving a PDCCH can be understood as receiving a PDCCH signal on the PDCCH.

[0147] The PDCCH signal includes a PDCCH data signal and a PDCCH DMRS, the PDCCH data signal carries DCI for example, and the PDCCH DMRS can be used for channel estimation of the PDCCH. The PDCCH data signal having a DFT-s-OFDM waveform can be understood as that the data signal FDMed with the PDCCH DMRS is obtained by DFT processing on the data carried by the PDCCH data signal. The DFT-s-OFDM waveform is a kind of single-carrier-like waveform, which has a low PAPR, and thus is beneficial to reduce the PAPR, thereby reducing the output back-off power, improving the transmission power, and ultimately achieving the effect of improving the coverage range.

[0148] The DFT can also be referred to as transform precoding, and the name thereof is not limited in the present application.

[0149] The PDCCH DMRS can be generated based on a low PAPR sequence. For example, the PDCCH DMRS can be generated based on a Zadoff-Chu sequence, which is an example of a low PAPR sequence, but this should not constitute any limitation on the present application, and the PDCCH DMRS can also use other low PAPR sequences.

[0150] FIG. 7 is a schematic diagram of introducing DFT according to an embodiment of the present application.

[0151] For example, as shown in FIG. 7, DFT is introduced before subcarrier mapping, and the data signal FDMed with the PDCCH DMRS is obtained by DFT processing on the data carried by the PDCCH data signal, thereby realizing that the PDCCH data signal has a DFT-s-OFDM waveform.

[0152] In addition, in the embodiment of the present application, the PDCCH signal occupies one OFDM symbol, or in other words, the PDCCH that transmits the PDCCH signal is a single-symbol PDCCH, that is, the PDCCH occupies one OFDM symbol in the time domain, and in the CORESET,

[0153] In the present application, the PDCCH data signal and the PDCCH DMRS occupy the same time domain resources and do not overlap in the frequency domain, which can be understood as that the PDCCH data signal and the PDCCH DMRS are frequency division multiplexed. For example, referring to FIG. 4b), a part of the 12 REs (such as the REs with indexes 1, 5, and 9) are used to carry the PDCCH DMRS, and the other part is used to carry the PDCCH data signal. As can be seen, the PDCCH DMRS and the PDCCH data signal are frequency division multiplexed.

[0154] In step 620, the network device transmits the PDCCH signal, and correspondingly, the terminal receives the PDCCH signal.

[0155] For example, the network device transmits the PDCCH signal on the PDCCH, and the PDCCH signal includes the PDCCH data signal and the PDCCH DMRS, and correspondingly, the terminal receives the PDCCH signal.

[0156] It can be understood that the PDCCH can be common, in other words, the PDCCH is located in the common search space; or the PDCCH can also be dedicated, in other words, the PDCCH is located in the dedicated search space.

[0157] In step 630, the terminal demodulates the PDCCH signal.

[0158] Exemplarily, after receiving the PDCCH signal, the terminal demodulates the PDCCH signal.

[0159] In the technical solution, the PDCCH data signal has a DFT-s-OFDM waveform, and the DFT-s-OFDM waveform is a kind of single-carrier-like waveform, and has a low PAPR. Therefore, compared with the OFDM waveform, the PAPR can be reduced, and the output back-off power of the PA can be reduced, so that the transmission power is improved, and the coverage is improved. To realize that the PDCCH data signal has a DFT-s-OFDM waveform, the data signal FDMed with the PDCCH DMRS is obtained by performing DFT processing on the data carried by the PDCCH data signal.

[0160] The frequency division of the PDCCH data signal and the PDCCH DMRS will be explained in detail below.

[0161] It can be understood that the PDCCH received by the terminal (the PDCCH received by the terminal can be understood as the PDCCH signal received by the terminal on the PDCCH, and the PDCCH signal includes the PDCCH data signal and the PDCCH DMRS) can be designed in the following two ways. One possible design is that the frequency domain resources occupied by the PDCCH are continuous, or in other words, the mapping mode of REG to CCE on the PDCCH is non-interleaved mapping, that is, REG is sequentially mapped to CCE without interleaving. Another possible design is that the frequency domain resources occupied by the PDCCH are discontinuous, or in other words, the mapping mode of REG to CCE on the PDCCH is interleaved mapping. The frequency division of the PDCCH data signal and the PDCCH DMRS will be explained in detail below.

[0162] Design 1: The frequency domain resources occupied by the PDCCH received by the terminal are continuous.

[0163] In this application, one possible case is that the PDCCH received by the terminal (such as terminal 1) and other terminals (such as terminal 2) can be the same, in other words, the PDCCH can be common, or in other words, the PDCCH received by terminal 1 and terminal 2 is located in the common search space. Another possible case is that the PDCCH received by the terminal (such as terminal 1) and other terminals (such as terminal 2) can also be different, in other words, the PDCCH can be dedicated, or in other words, the PDCCH received by terminal 1 is located in the dedicated search space.

[0164] It is assumed that the frequency domain resources occupied by the PDCCH DMRS include P subcarriers. Wherein, P is a positive integer, P can be a positive integer greater than or equal to 6, and the application does not limit the value of P.

[0165] For the P subcarriers, one possible design is that the interval between any two adjacent subcarriers in the P subcarriers is equal, or in other words, the PDCCH DMRS is uniformly distributed in the frequency domain resource (i.e., the PDCCH DMRS is uniformly placed), or in other words, there is a subcarrier for carrying the PDCCH DMRS every fixed number of subcarriers. The interval between the two adjacent subcarriers can be considered as the difference between the indexes of the two adjacent subcarriers. In addition, the subcarriers other than the P subcarriers in the carrier can be used to carry the PDCCH data signal. It can be seen that, assuming that the interval between any two adjacent subcarriers is △, or in other words, there is a subcarrier for carrying the PDCCH DMRS every (△-1) subcarriers, the overhead of the PDCCH DMRS is 1 / △.

[0166] FIG. 8 gives an example of the distribution of the PDCCH DMRS. FIG. 8 is a schematic diagram of the distribution of the PDCCH DMRS provided by an embodiment of the present application. In FIG. 8, △=4 is taken as an example, or in other words, there is a subcarrier for carrying the PDCCH DMRS every three subcarriers in the carrier.

[0167] As shown in FIG. 8, each box represents an RE, or in other words, each box represents one OFDM symbol in the time domain and one subcarrier in the frequency domain. FIG. 8 shows 12 REs, or in other words, one REG (part of a PDCCH), and the PDCCH occupies the frequency domain resource continuously. It can be seen that there is a subcarrier for carrying the PDCCH DMRS every three subcarriers, or in other words, the interval between any two adjacent subcarriers in the at least one subcarrier for carrying the PDCCH DMRS is 4. For example, the indexes of the subcarriers occupied by the PDCCH DMRS are 1, 5, and 9 (the subcarriers are numbered from 0), and the remaining REs are used to carry the PDCCH data signal.

[0168] It should be understood that the frequency domain resources occupied by the PDCCH DMRS described above include P subcarriers, the interval between any two adjacent subcarriers in the P subcarriers is equal, then the index λ of each subcarrier in the P subcarriers can be obtained according to the following formula: λ = δ + a · Δ, wherein δ represents the offset of the first subcarrier in the P subcarriers relative to the first subcarrier in the Q (Q is a positive integer, Q is greater than or equal to P) subcarriers occupied by the PDCCH, Δ represents the interval between any two adjacent subcarriers in the P subcarriers, and a takes the value of 0, 1, …, P-1. Assuming that the subcarriers are numbered from 0, the first subcarrier in the Q subcarriers occupied by the PDCCH can also be regarded as the subcarrier 0 in the Q subcarriers occupied by the PDCCH. Taking P = 3, Δ = 4, and δ = 1 as an example (see FIG. 8), the indexes of the three subcarriers are 1 + 0 × 4 = 1, 1 + 1 × 4 = 5, and 1 + 2 × 4 = 9, respectively.

[0169] The offset δ of the first subcarrier in the P subcarriers relative to the first subcarrier in the Q subcarriers, one possible implementation is that the offset δ of the first subcarrier in the P subcarriers relative to the first subcarrier in the Q subcarriers is related to a first parameter, the first parameter is one or more of the following: a terminal identifier, a cell identifier, a BWP identifier, a frame index, a subframe index, a slot index, or an OFDM symbol index. Wherein, the terminal is an example of the first communication device.

[0170] In one example, the offset δ of the first subcarrier in the P subcarriers relative to the first subcarrier in the Q subcarriers is related to the terminal identifier. For example, in the same cell, the terminal identifiers of user 1 and user 2 are different, then the positions of the first subcarriers in at least one subcarrier occupied by the PDCCH DMRS corresponding to user 1 and user 2 can be different.

[0171] In another example, the offset δ of the first subcarrier in the P subcarriers relative to the first subcarrier in the Q subcarriers is related to the cell identifier. For example, the cell identifiers of cell 1 and cell 2 are different, then the positions of the first subcarriers in at least one subcarrier occupied by the PDCCH DMRS corresponding to cell 1 and cell 2 can be different.

[0172] In yet another example, the offset δ of the first subcarrier in the P subcarriers relative to the first subcarrier in the Q subcarriers is related to the terminal identifier and the cell identifier. For example, the terminal identifiers of user 1 and user 2 are different, and the cell identifiers are also different, then the positions of the first subcarriers in at least one subcarrier occupied by the PDCCH DMRS corresponding to user 1 and user 2 can be different. Here, it is not listed one by one.

[0173] The offset δ of the first subcarrier among the P subcarriers relative to the first subcarrier among the Q subcarriers is related to the first parameter. One possible design is that the offset δ satisfies the following relationship: δ = X mod Δ, where X is calculated based on the first parameter, Δ represents the interval between any two adjacent subcarriers among the P subcarriers, and mod represents the modulo operation.

[0174] for example, in This refers to the signage indicating the residential area. For example,

[0175] Here, c(i) represents a pseudo-random sequence, such as a gold sequence or a longest linear shift register sequence (also known as an m-sequence). When considering the common PDCCH, the initial value of the pseudo-random sequence is c. init It can be When considering a dedicated PDCCH, c init It can be used as a terminal identifier. This indicates the number of OFDM symbols contained in a slot. This indicates that the subcarrier spacing is 15.2 μ The intra-slot index at kilohertz (kHz), where μ is a non-negative integer. l represents the symbol index of the PDCCH symbol within a slot.

[0176] It is understood that the formula satisfied by the above offset δ is merely an example and should not constitute any limitation on the embodiments of this application. For example, simple variations based on the above formula should also fall within the protection scope of this application, such as δ=XmodΔ+L, where L is a positive integer.

[0177] Design 2: The frequency domain resources occupied by the PDCCH corresponding to the above terminals are not continuous.

[0178] As an example and not a limitation, the PDCCH corresponding to the aforementioned terminal occupies multiple non-contiguous frequency domain sub-blocks. The spacing between any two adjacent frequency domain sub-blocks is equal, and each frequency domain sub-block includes subcarriers used to carry PDCCH DMRS. Subcarriers in each frequency domain sub-block, excluding those used to carry PDCCH DMRS, can be used to carry PDCCH data signals. Assume each frequency domain sub-block includes K subcarriers, where K1 (K1 less than or equal to K) subcarriers are used to carry PDCCH DMRS, and the remaining (K-K1) subcarriers are used to carry PDCCH data signals.

[0179] It can be understood that the interval between any two adjacent frequency domain sub-blocks in the plurality of non-continuous frequency domain sub-blocks is equal, if the size of the frequency domain sub-blocks is also equal (or in other words, the number of sub-carriers included in each frequency domain sub-block is equal), and the relative position of the PDCCH DMRS in each frequency domain sub-block is the same, then the interval between any two adjacent sub-carriers occupied by the PDCCH DMRS is equal. Wherein, in each frequency domain sub-block, the position of the sub-carrier occupied by the PDCCH DMRS relative to the first sub-carrier in the frequency domain sub-block can be fixed, such as in each frequency domain sub-block, the PDCCH DMRS occupies the first sub-carrier in the frequency domain sub-block.

[0180] The interval between any two adjacent frequency domain sub-blocks in the plurality of non-continuous frequency domain sub-blocks can be considered as the interval between the sub-carriers with the same position in the two adjacent frequency domain sub-blocks.

[0181] The distribution of the frequency domain sub-blocks and the sub-carriers occupied by the PDCCH DMRS and the PDCCH data signal in each frequency domain sub-block will be explained in detail below in combination with FIG. 9.

[0182] FIG. 9 is a schematic diagram of the frequency domain sub-blocks provided by the embodiments of the present application.

[0183] In FIG. 9, each frequency domain sub-block includes 2 sub-carriers and 3 sub-carriers as an example, FIG. 9a) and FIG. 9b) show the case that each frequency domain sub-block includes 2 sub-carriers, and FIG. 9c), FIG. 9d) and FIG. 9e) show the case that each frequency domain sub-block includes 3 sub-carriers.

[0184] As shown in FIG. 9a), each frequency domain sub-block includes 2 sub-carriers, the 0th sub-carrier in each frequency domain sub-block is used to carry the PDCCH data signal, and the 1st sub-carrier is used to carry the PDCCH DMRS. The interval between the 0th sub-carrier in the first frequency domain sub-block and the 0th sub-carrier in the second frequency domain sub-block can be considered as the interval between the two adjacent frequency domain sub-blocks. Similarly, the interval between the 1st sub-carrier in the first frequency domain sub-block and the 1st sub-carrier in the second frequency domain sub-block can be considered as the interval between the two adjacent frequency domain sub-blocks.

[0185] As shown in FIG. 9b), each frequency domain sub-block includes 2 sub-carriers, the 0th sub-carrier in each frequency domain sub-block is used to carry the PDCCH DMRS, and the 1st sub-carrier is used to carry the PDCCH data signal.

[0186] As shown in FIG. 9c), each frequency domain sub-block includes 3 sub-carriers, the 0th sub-carrier in each frequency domain sub-block is used to carry the PDCCH DMRS, and the 1st sub-carrier and the 2nd sub-carrier are used to carry the PDCCH data signal.

[0187] As shown in d) of FIG. 9, each frequency domain sub-block includes 3 sub-carriers, the 1st sub-carrier in each frequency domain sub-block is used to carry PDCCH DMRS, and the 0th sub-carrier and the 2nd sub-carrier are used to carry PDCCH data signals.

[0188] As shown in e) of FIG. 9, each frequency domain sub-block includes 3 sub-carriers, the 2nd sub-carrier in each frequency domain sub-block is used to carry PDCCH DMRS, and the 0th sub-carrier and the 1st sub-carrier are used to carry PDCCH data signals.

[0189] It should be understood that the above takes an example that PDCCH DMRS occupies one sub-carrier in each frequency domain sub-block, but this should not constitute any limitation on the embodiments of the present application. For example, the number of sub-carriers occupied by PDCCH DMRS in each frequency domain sub-block can also be more.

[0190] The position of the first sub-carrier in the at least one sub-carrier occupied by PDCCH DMRS in each frequency domain sub-block can adopt the following design: the index γ of the first sub-carrier in the at least one sub-carrier occupied by PDCCH DMRS in each frequency domain sub-block is related to a second parameter, which is one or more of the following: terminal identification, cell identification, BWP identification, frame index, subframe index, slot index, or OFDM symbol index.

[0191] In an example, the index γ of the first sub-carrier in the at least one sub-carrier occupied by PDCCH DMRS in each frequency domain sub-block is related to terminal identification. For example, in the same cell, the terminal identifications of user 1 and user 2 are different, so in each frequency domain sub-block, the index of the first sub-carrier in the at least one sub-carrier occupied by PDCCH DMRS corresponding to user 1 and user 2 can be different.

[0192] In another example, the index γ of the first sub-carrier in the at least one sub-carrier occupied by PDCCH DMRS in each frequency domain sub-block is related to cell identification. For example, the cell identifications of cell 1 and cell 2 are different, so in each frequency domain sub-block, the index of the first sub-carrier in the at least one sub-carrier occupied by PDCCH DMRS corresponding to cell 1 and cell 2 can be different.

[0193] In yet another example, the index γ of the first sub-carrier in the at least one sub-carrier occupied by PDCCH DMRS in each frequency domain sub-block is related to terminal identification and cell identification. For example, the terminal identifications of user 1 and user 2 are different, and the cell identifications are also different, so in each frequency domain sub-block, the index of the first sub-carrier in the at least one sub-carrier occupied by PDCCH DMRS corresponding to user 1 and user 2 can be different. Here, it is not listed one by one.

[0194] Optionally, an index of a first subcarrier in at least one subcarrier occupied by the PDCCH DMRS in each frequency domain sub-block satisfies the following relationship: γ = Y mod K, where Y is calculated based on the second parameter, K represents a number of subcarriers included in one frequency domain sub-block, and mod represents a modulo operation.

[0195] The process of calculating Y based on the second parameter can refer to the process of calculating X based on the first parameter described above, which will not be described in detail here.

[0196] It can be understood that the formula satisfied by γ described above is only an example and should not constitute any limitation on the embodiments of the present application. For example, based on a simple transformation of the above formula, it should also fall within the protection scope of the present application, such as γ = Y mod K + H, H is a positive integer.

[0197] Optionally, the PDCCH data signal in the PDCCH signal includes a plurality of first PDCCH data signals, and the plurality of first PDCCH data signals are time division multiplexed; and / or, the plurality of first PDCCH data signals are frequency division multiplexed.

[0198] The plurality of first PDCCH data signals can correspond to one terminal (such as terminal 1), in other words, the PDCCH data signal in the PDCCH data signal includes the PDCCH data signal received by terminal 1; the plurality of first PDCCH data signals can also correspond to a plurality of terminals (such as terminal 1 and terminal 2), in other words, the PDCCH data signal in the PDCCH data signal includes the PDCCH data signal received by terminal 1, and can also include the PDCCH data signal received by terminal 2.

[0199] The multiplexing manner of the plurality of first PDCCH data signals when the plurality of first PDCCH data signals correspond to a plurality of terminals will be explained in detail below.

[0200] Exemplarily, the plurality of first PDCCH data signals can adopt any one or more of the following designs:

[0201] Design A: The plurality of first PDCCH data signals are time division multiplexed.

[0202] That is, the frequency domain resources occupied by the plurality of first PDCCH data signals are the same, and the time domain resources do not overlap.

[0203] Exemplarily, the plurality of first PDCCH data signals are time division multiplexed, and then frequency division multiplexed with the PDCCH DMRS. When the plurality of first PDCCH data signals and the PDCCH DMRS are frequency division multiplexed, there is a PDCCH DMRS every fixed number of subcarriers, and the remaining subcarriers carry the first PDCCH data signals. For details, refer to the foregoing description of the frequency division multiplexing of the PDCCH data signals and the PDCCH DMRS, which will not be repeated here.

[0204] FIG. 10 is a schematic diagram of time division multiplexing between a plurality of first PDCCH data signals according to an embodiment of the present application.

[0205] As shown in FIG. 10, the plurality of first PDCCH data signals are taken as an example of three, such as DCI 1 to DCI 3 shown in FIG. 10. The plurality of first PDCCH data signals are time division multiplexed, and then frequency domain interleaved with the PDCCH DMRS after DFT (that is, the time division multiplexing of the plurality of PDCCH data signals is implemented before DFT), and then subjected to IFFT. For details of the specific process of IFFT and the subsequent steps, refer to FIG. 3. The frequency domain interleaving of the DCI and the PDCCH DMRS means that there is a subcarrier for carrying the PDCCH DMRS every fixed number of subcarriers (including the case of PDCCH continuity and discontinuity), and the DCI is placed between the PDCCH DMRS. For details, refer to the foregoing description, which will not be repeated here.

[0206] Design B: the plurality of first PDCCH data signals are frequency division multiplexed.

[0207] That is, the plurality of first PDCCH data signals occupy the same time domain resources and do not overlap in the frequency domain.

[0208] Exemplarily, the plurality of first PDCCH data signals and the PDCCH DMRS are frequency division multiplexed. One implementation is that, assuming that the interval between two adjacent subcarriers carrying the PDCCH DMRS is Δ, for each first PDCCH data signal received by a terminal, there is a subcarrier for carrying the first PDCCH data signal every (Δ-1) subcarriers. It is not difficult to understand that in this way, the maximum number of frequency division users is (Δ-1). That is, there is a subcarrier carrying the PDCCH DMRS every (Δ-1) subcarriers, and the remaining subcarriers are used to carry the first PDCCH data signals. For the first PDCCH data signal received by the same terminal, the interval between two adjacent subcarriers carrying the first PDCCH data signal received by the terminal is also Δ.

[0209] It can be understood that in the above example, applied to the DFT-s-OFDM shown in FIG. 3, for each terminal received first PDCCH data signal, every (△-1) subcarriers are mapped with a DFT output, that is, the DFT output is discontinuously mapped.

[0210] FIG. 11 is a schematic diagram of frequency division multiplexing between a plurality of first PDCCH data signals according to an embodiment of the present application. FIG. 11a shows a case where the frequency domain resources occupied by the PDCCH received by a terminal are continuous, and FIG. 11b shows a case where the frequency domain resources occupied by the PDCCH received by a terminal include a plurality of non-continuous frequency domain sub-blocks.

[0211] As shown in FIG. 11a, the above plurality of first PDCCH data signals are taken as an example of 3, such as DCI 1 to DCI 3 shown in FIG. 11a, the plurality of first PDCCH data signals are frequency division multiplexed, every (△-1) subcarriers have a subcarrier carrying PDCCH DMRS, for the first PDCCH data signal received by the same terminal, the interval between the adjacent two subcarriers carrying the first PDCCH data signal received by the terminal is △, that is, for the first PDCCH data signal received by the same terminal, every (△-1) subcarriers are mapped with a DFT output.

[0212] As shown in FIG. 11b, the above plurality of first PDCCH data signals are taken as an example of 2, such as DCI 1 and DCI 2 shown in FIG. 11b, the plurality of first PDCCH data signals are frequency division multiplexed, every (L-1) subcarriers have a subcarrier carrying PDCCH DMRS, where L is the interval between the adjacent two frequency domain sub-blocks, for the first PDCCH data signal received by the same terminal, the interval between the adjacent two subcarriers carrying the first PDCCH data signal received by the terminal is L, that is, for the first PDCCH data signal received by the same terminal, every (L-1) subcarriers are mapped with a DFT output.

[0213] It can be understood that in FIG. 11, the PDCCH DMRS can be common, but this should not constitute any limitation on the present application. For example, the PDCCH DMRS can also be dedicated.

[0214] An example of frequency division multiplexing of a plurality of first PDCCH data signals received by a plurality of terminals in the case of a plurality of PDCCH DMRS corresponding to the plurality of terminals will be given below in connection with FIG. 12.

[0215] FIG. 12 is another schematic diagram of frequency division multiplexing between a plurality of first PDCCH data signals according to an embodiment of the present application.

[0216] As shown in FIG. 12, the PDCCH 1 received by the terminal 1 includes the DCI 1 and the DMRS 1, the PDCCH 2 received by the terminal 2 includes the DCI 2 and the DMRS 2, the PDCCH 3 received by the terminal 3 includes the DCI 3 and the DMRS 3, and the PDCCH 4 received by the terminal 4 includes the DCI 4 and the DMRS 4. For each terminal, there is a subcarrier carrying the DMRS of the PDCCH received by the terminal every (△-1)=7 subcarriers, and for the DCI received by the same terminal, a DFT output is mapped every (△-1) subcarriers.

[0217] The scenario shown in FIG. 12 may, for example, be a case where the PDCCH received by a certain terminal includes a plurality of non-continuous frequency domain subblocks. A possible design is that the interval between any two adjacent frequency domain subblocks in the plurality of non-continuous frequency domain subblocks is n*K, where K represents the number of subcarriers included in one frequency domain subblock, and n represents the maximum number of PDCCHs for frequency division. That is, the plurality of PDCCHs can be frequency-divisioned. Where the dedicated PDCCH is considered, the maximum number of PDCCHs for frequency division can be replaced by the maximum number of users for frequency division.

[0218] As shown in FIG. 12, an example is taken with n=4 and K=2, but this should not constitute any limitation on the embodiments of the present application. One of the four PDCCHs can correspond to one terminal, and the DMRS corresponding to different PDCCHs can be different, and the interval between any two adjacent frequency domain subblocks is 4*K=8. It can be seen that for each PDCCH, the interval between two adjacent frequency domain subblocks in the frequency domain subblocks included by the PDCCH is equal, and the interval between any two adjacent subcarriers in at least one subcarrier occupied by the PDCCH DMRS is equal.

[0219] It can be understood that the design A and the design B can be used in combination, in other words, the plurality of first PDCCH data signals corresponding to the plurality of terminals can be time-divisioned and frequency-divisioned. Exemplarily, an example is taken with a) in FIG. 11, it is assumed that the first PDCCH data signals corresponding to the terminal 1 and the terminal 2 are time-divisioned, that is, the DCI 1 and the DCI 2 are time-division multiplexed, and then frequency-division multiplexed with the DCI 3, where the size of the DFT corresponding to the DCI 1 and the DCI 2 after time-division multiplexing can be 2 times the size of the DFT corresponding to the DCI 3.

[0220] Optionally, the frequency division multiplexing between the plurality of first PDCCH data signals is implemented based on OCC. The difference between this mode and the above example is that the DFT output no longer needs to be mapped with interval Δ, but is mapped continuously, i.e., is mapped to all subcarriers, except that the OCC cannot make the PDCCH data signal mapped to the subcarriers occupied by the PDCCH DMRS have a non-zero signal, i.e., the OCC needs to make the PDCCH data signal mapped to the subcarriers occupied by the PDCCH DMRS have a zero signal.

[0221] Suppose the OCC length is k, the OCC makes every (k-1) data in the DFT output non-zero. Exemplarily, suppose the DCI is represented by a time domain sequence x0={x0(n)}, n=0, 1, …, N-1 with length N, the OCC length is 2, and the OCC is [1, 1], which means that each element of the time domain sequence x0 is repeated twice, then the OCC processing obtains [x0, x0], i.e., a new sequence with length 2N, i.e., {x0(0), x0(1), …, x0(N-1), x0(0), x0(1), …, x0(N-1)}. The 2N-point DFT of [x0, x0] obtains a sequence y0={y0(m)}, m=0, 1, …, 2N-1. When m is odd, y0(m)=0, i.e., every 1 data in {y0(m)} is non-zero. Suppose the DCI is represented by a time domain sequence x1={x1(n)}, n=0, 1, …, N-1 with length N, the OCC is [1, -1], which means that the first part remains unchanged and the second part takes the opposite number, then the OCC processing obtains [x1, -x1], i.e., a new sequence with length 2N, i.e., {x1(0), x1(1), …, x1(N-1), -x1(0), -x1(1), …, -x1(N-1)}. The 2N-point DFT of [x1, -x1] obtains a sequence y1={y1(m)}, m=0, 1, …, 2N-1. When m is even, y1(m)=0, i.e., every 1 data in {y1(m)} is non-zero. Thus, by using the OCC, the positions of the non-zero elements of y0 and y1 can be implemented not to overlap, which is equivalent to implementing frequency division multiplexing, so the above plurality of first PDCCH data signals can implement frequency division multiplexing based on OCC.

[0222] FIG. 13 is a schematic diagram of implementing frequency division multiplexing based on OCC provided by the embodiment of the present application.

[0223] As shown in FIG. 13, the DCI 1 to DCI 3 are frequency division multiplexed based on OCC. The DFT output no longer needs to be mapped with interval Δ, but is mapped continuously, i.e., on all subcarriers. Taking an example of Δ = 4 and δ = 1, the OCC applied by the DCI 1 is [1, -j, -1, j] (indicating that the first part is the original sequence, the second part is the original sequence multiplied by -j, the third part is the opposite, and the fourth part is the original sequence multiplied by j), the OCC applied by the DCI 2 is [1, -1, 1, -1], and the OCC applied by the DCI 3 is [1, 1, 1, 1].

[0224] Optionally, the OCC is related to one or more of the following: an interval between any two adjacent subcarriers occupied by the PDCCH DMRS, or a relative position of the frequency domain resource occupied by the PDCCH DMRS.

[0225] The OCC being related to the interval between any two adjacent subcarriers occupied by the PDCCH DMRS means that the length of the OCC is related to the interval between any two adjacent subcarriers occupied by the PDCCH DMRS.

[0226] The OCC being related to the relative position of the frequency domain resource occupied by the PDCCH DMRS means that, after the length of the OCC is determined, the code word is related to the relative position of the frequency domain resource occupied by the PDCCH DMRS. For example, the OCC cannot cause any one of the plurality of first PDCCH data signals to be non-zero at the DMRS RE position.

[0227] A possible case is that, when the frequency domain resource occupied by the PDCCH is continuous, the length of the OCC is equal to the interval between any two adjacent subcarriers occupied by the PDCCH DMRS. When the frequency domain resource occupied by the PDCCH is non-continuous (i.e., the case that the PDCCH includes a plurality of non-continuous frequency domain subblocks), the length of the OCC is equal to the interval between two adjacent frequency domain subblocks. It can be understood that, when the frequency domain resource occupied by the PDCCH is non-continuous, if the size of each frequency domain subblock is the same, and the relative position of the PDCCH DMRS in each frequency domain subblock is fixed, the length of the OCC can also be considered to be equal to the interval between any two adjacent subcarriers occupied by the PDCCH DMRS.

[0228] Another possible case is that OCC is related to δ when the frequency domain resources occupied by PDCCH are continuous, and OCC is related to γ when the frequency domain resources occupied by PDCCH are discontinuous. Exemplarily, OCC can be determined according to δ or γ, so that the PDCCH data signal mapped to the subcarriers has zero signals at the subcarriers occupied by the PDCCH DMRS, that is, OCC cannot make the PDCCH data signal mapped to the subcarriers have non-zero signals at the subcarriers occupied by the PDCCH DMRS.

[0229] The method provided by the embodiments of the present application is described in detail above in combination with the drawings. The device provided by the embodiments of the present application is described in detail below in combination with the drawings.

[0230] FIG. 14 is a schematic block diagram of a communication device 1400 provided by the embodiments of the present application.

[0231] As shown in FIG. 14, the communication device 1400 includes a processing module 1410 and a transceiver module 1420.

[0232] The transceiver module 1420 can implement corresponding communication functions, and the transceiver module 1420 can also be referred to as an input / output interface or a communication unit. The processing module 1410 can be used to perform processing operations. It should be understood that if the device 1400 is a component configured in a network device or a terminal, such as a chip, the transceiver module 1420 can be an input / output interface.

[0233] Optionally, the transceiver module 1420 can include a sending module and a receiving module. The sending module is used to perform the sending operations of the network device or the terminal in FIG. 6 described above, and the receiving module is used to perform the receiving operations of the network device or the terminal in FIG. 6 described above.

[0234] It should be understood that when the device 1400 is a component configured in a network device or a terminal, such as a chip, the sending module can be an output interface, and the sending operations involved in the embodiments of the present application can be performed by the output interface; the receiving module can be an input interface, and the receiving operations involved in the embodiments of the present application can be performed by the input interface.

[0235] Optionally, the device 1400 can further include a storage module, which can be used to store instructions and / or data. The processing module 1410 can read the instructions and / or data in the storage module, so that the device implements the method embodiments shown in the previous FIG. 6.

[0236] In one possible design, the apparatus 1400 can be used to implement the functions of a terminal in the method embodiment shown in FIG. 6, or the apparatus 1400 can include a unit for implementing any function or operation of a terminal in the method embodiment shown in FIG. 6, and the unit can be implemented by software, hardware, firmware, or any combination thereof, entirely or partially.

[0237] When the apparatus 1400 is used to implement the functions of a terminal in the method embodiment shown in FIG. 6, the transceiver module 1420 (which can be specifically a receiving module) can be used to perform step 620 in FIG. 6, receive a PDCCH signal from a network device, where the PDCCH signal includes a PDCCH data signal and a PDCCH DMRS, the PDCCH data signal has a DFT-s-OFDM waveform, the PDCCH data signal and the PDCCH DMRS occupy the same time domain resource and do not overlap in frequency domain resource. The processing module 1410 is configured to perform step 630, demodulate the PDCCH signal.

[0238] In another possible design, the apparatus 1400 can be used to implement the functions of a network device in the method embodiment shown in FIG. 6, or the apparatus 1400 can include a unit for implementing any function or operation of a network device in the method embodiment shown in FIG. 6, and the unit can be implemented by software, hardware, firmware, or any combination thereof, entirely or partially.

[0239] When the apparatus 1400 is used to implement the functions of a network device in the method embodiment shown in FIG. 6, the transceiver module 1420 (which can be specifically a sending module) can be used to perform step 620 in FIG. 6, send a PDCCH signal to a terminal, where the PDCCH signal includes a PDCCH data signal and a PDCCH DMRS, the PDCCH data signal has a DFT-s-OFDM waveform, the PDCCH data signal and the PDCCH DMRS occupy the same time domain resource and do not overlap in frequency domain resource. The processing module 1410 is configured to perform step 610, generate the PDCCH signal.

[0240] Optionally, the frequency domain resource occupied by the PDCCH received by the terminal is continuous.

[0241] Optionally, the frequency domain resource occupied by the PDCCH DMRS includes P subcarriers, and the interval between any two adjacent subcarriers in the P subcarriers is equal.

[0242] Optionally, the frequency domain resource occupied by the PDCCH received by the terminal comprises Q subcarriers, and a first subcarrier in the P subcarriers has an offset δ relative to a first subcarrier in the Q subcarriers, and the first parameter is related to one or more of the following: an identifier of the terminal, a cell identifier, a BWP identifier, a frame index, a subframe index, a slot index, or an OFDM symbol index.

[0243] Optionally, the offset δ satisfies the following relationship: δ = X mod Δ, where X is calculated based on the first parameter, Δ represents an interval between any two adjacent subcarriers in the P subcarriers, and mod represents a modulo operation.

[0244] Optionally, the PDCCH corresponding to the terminal occupies a plurality of non-continuous frequency domain subblocks, and an interval between any two adjacent frequency domain subblocks in the plurality of non-continuous frequency domain subblocks is equal, and each frequency domain subblock comprises a subcarrier for carrying the PDCCH DMRS.

[0245] Optionally, an index γ of a first subcarrier in at least one subcarrier occupied by the PDCCH DMRS in each frequency domain subblock is related to a second parameter, and the second parameter is one or more of the following: an identifier of the terminal, a cell identifier, a BWP identifier, a frame index, a subframe index, a slot index, or an OFDM symbol index.

[0246] Optionally, the index γ of the first subcarrier in the at least one subcarrier occupied by the PDCCH DMRS in each frequency domain subblock satisfies the following relationship: γ = Y mod K, where Y is calculated based on the second parameter, K represents a number of subcarriers included in one frequency domain subblock, and mod represents a modulo operation.

[0247] Optionally, an interval between any two adjacent frequency domain subblocks in the plurality of non-continuous frequency domain subblocks is n*K, where K represents a number of subcarriers included in one frequency domain subblock, and n represents a maximum PDCCH quantity of frequency division.

[0248] Optionally, the PDCCH data signal comprises a plurality of first PDCCH data signals, and the plurality of first PDCCH data signals are time division multiplexed; and / or, the plurality of first PDCCH data signals are frequency division multiplexed.

[0249] Optionally, the frequency division multiplexing between the plurality of first PDCCH data signals is implemented based on OCC; and the OCC is related to one or more of the following: an interval between any two adjacent subcarriers occupied by the PDCCH DMRS, a relative position of the frequency domain resource occupied by the PDCCH DMRS.

[0250] Optionally, the time division multiplexing is implemented before DFT.

[0251] Optionally, the PDCCH DMRS is generated based on a Zadoff-Chu sequence.

[0252] More detailed description of the processing module 1410 and the transceiver module 1420 can be directly obtained by referring to the related description in the method embodiment shown in FIG. 6, and will not be repeated here.

[0253] It should be noted that the transceiver module can also be referred to as a transceiver unit, a transceiver, a transceiver device, or the like. The processing module can also be referred to as a processor, a processing board, a processing unit, or the like. Optionally, the transceiver module is configured to perform the sending operation and the receiving operation of the terminal device or the network device in the above method. The device in the communication module for implementing the receiving function can be regarded as a receiving module, and the device in the communication module for implementing the sending function can be regarded as a sending module, that is, the transceiver module includes the receiving module and the sending module.

[0254] In addition, in a possible design, the foregoing transceiver module and / or processing module can be implemented by a virtual module, for example, the processing module can be implemented by a software function module or a virtual device, and the transceiver module can be implemented by a software function module or a virtual device. In another possible design, the processing module or the transceiver module can also be implemented by an entity device, for example, if the device is implemented by a chip / chip circuit, the transceiver module can be an input / output circuit and / or a communication interface, and performs the input operation (corresponding to the foregoing receiving operation) and the output operation (corresponding to the foregoing sending operation); and the processing module is an integrated processor or a microprocessor or an integrated circuit.

[0255] It should be understood that the division of the modules in the embodiments of the present application is schematic, and is merely a logical function division. In actual implementation, another division manner can be used. In addition, each function module in each embodiment of the present application can be integrated in one processor, or can be physically separated, or two or more modules can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software function module.

[0256] FIG. 15 is another schematic block diagram of a communication device 1500 provided by an embodiment of the present application. The device 1500 can be a chip system, or can be a device configured with a chip system, for implementing the method embodiments. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0257] As shown in FIG. 15, the apparatus 1500 can include a processor 1510, which can be configured to execute computer program or instructions in the memory to implement the steps performed by the terminal or the steps performed by the network device in the method embodiments shown in FIG. 6.

[0258] Optionally, the apparatus 1500 further includes a communication interface 1520. The communication interface 1520 can be configured to communicate with other devices through a transmission medium, so that the apparatus 1500 can communicate with other devices. The communication interface 1520 can be, for example, a transceiver, an interface, a bus, a circuit and / or a device capable of realizing the transceiving function. The processor 1510 can input and output data through the communication interface 1520, and be configured to implement the method shown in FIG. 6. Specifically, the apparatus 1500 can be configured to implement the functions of the network device or the terminal in the method embodiments.

[0259] When the apparatus 1500 is configured to implement the method shown in FIG. 6, the processor 1510 is configured to implement the functions of the processing module 1410, and the communication interface 1520 is configured to implement the functions of the transceiving module 1420.

[0260] Optionally, the apparatus 1500 further includes at least one memory 1530 configured to store program instructions and / or data. The memory 1530 is coupled to the processor 1510. The coupling between the apparatuses, units or modules in the embodiments of the present application is indirect coupling or communication connection between the apparatuses, units or modules, which can be electrical, mechanical or other forms, and is used for information interaction between the apparatuses, units or modules. The processor 1510 can operate in cooperation with the memory 1530. The processor 1510 can execute the program instructions stored in the memory 1530. At least one of the at least one memory can be included in the processor.

[0261] It should be understood that the coupling in the embodiments of the present application is an indirect coupling or a communication connection between the devices, units or modules, which can be electrical, mechanical or other forms, for information interaction between the devices, units or modules. The processor 1510 can operate in cooperation with the memory 1530. The specific connection medium between the processor 1510, the communication interface 1520 and the memory 1530 is not limited in the embodiments of the present application. In FIG. 15, the processor 1510, the communication interface 1520 and the memory 1530 are connected through the bus 1540. The connection mode between other components in FIG. 15 is only schematically illustrated, and is not limited. The bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, only one thick line is used to represent the bus in FIG. 15, but it does not mean that there is only one bus or only one type of bus.

[0262] It should be understood that when the communication device 1500 is a chip applied to a terminal, the chip implements the functions of the terminal in the method embodiments. The chip of the terminal receives a signal from other modules (such as a radio frequency module or an antenna) in the terminal, and the signal can be sent by a network device to the terminal; or the chip of the terminal sends a signal to other modules (such as a radio frequency module or an antenna) in the terminal, and the signal can be sent by the terminal to the network.

[0263] When the communication device 1500 is a chip applied to a network device, the chip implements the functions of the network device in the method embodiments. The chip of the network device receives a signal from other modules (such as a radio frequency module or an antenna) in the network device, and the signal can be sent by a terminal to the network device; or the chip of the network device sends a signal to other modules (such as a radio frequency module or an antenna) in the network device, and the signal can be sent by the network device to the terminal.

[0264] It should be noted that when the communication device 1500 is a terminal or a network device, the communication interface 1520 can be a transceiver, which can specifically include a transmitter and a receiver, the transmitter is used to send a signal, and the receiver is used to receive a signal. When the communication device 1500 is a chip applied to a terminal or a network device, the communication interface 1520 can be an input / output circuit, a bus, a module, a pin or other types of communication interface input / output circuits, wherein the input circuit in the input / output circuit can be used for receiving, and the output interface can be used for sending.

[0265] The application further provides a computer program product, which comprises a computer program (also referred to as code or instruction) that can implement the method in the embodiment shown in FIG. 6 when the computer program is executed.

[0266] The application further provides a computer readable storage medium, which stores a computer program (also referred to as code or instruction). The computer program can implement the method in the embodiment shown in FIG. 6 when the computer program is executed.

[0267] The application provides a communication system, which comprises the terminal and the network device as described above.

[0268] It should be understood that the processor in the embodiments of the application can be an integrated circuit chip with a processing capability of signals. In the implementation process, each step of the method embodiments can be completed by integrated logic circuits or instruction in the form of software in the processor. The processor can be a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. Each method, step and logic block diagram disclosed in the embodiments of the application can be implemented or executed. The general processor can be a microprocessor or the processor can be any conventional processor. The steps of the method disclosed in the embodiments of the application can be directly embodied as a hardware code processor for execution, or a combination of hardware and software modules in the code processor for execution. The software module can be located in a random access memory, a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register or other mature storage medium in the art. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.

[0269] It should also be understood that the memory in the embodiments of the present application can be a volatile memory or a nonvolatile memory, or can include both volatile and nonvolatile memory. Among them, the nonvolatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM) used as an external cache. By way of example, and not limitation, many forms of RAM can be used, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the system and method described herein is intended to include, but not be limited to, these and any other suitable types of memory.

[0270] The terms "unit", "module" and the like used in the specification can be used to represent a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. The units and modules in the embodiments of the present application have the same meaning and can be used interchangeably.

[0271] Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both. The choice of hardware or software, or combinations of both, would be dependent on the specific application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application. In several embodiments provided in the present application, it will be apparent that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the described device embodiments are merely illustrative, and the division into units is merely a logical function division, and actual implementation can have another division, for example, multiple units or components can be combined or integrated into another system, or some features can be omitted or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0272] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place or can be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0273] In addition, the functional units in each of the embodiments of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0274] In the above embodiments, the functions of the various functional units can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, the functions can be implemented in whole or in part as a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are wholly or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes one or more available media sets. The available media can be magnetic media (for example, floppy disk, hard disk, magnetic tape), optical media (for example, digital video disc (DVD)), or semiconductor media (for example, solid state disk (SSD)) and the like.

[0275] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that make a contribution to the technology or parts of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for making a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media that can store program codes.

Claims

1. A signal transmission method, characterized by, The method applied to a first communication device comprises: receiving a physical downlink control channel (PDCCH) signal from a second communication device, the PDCCH signal comprising a PDCCH data signal and a PDCCH demodulation reference signal (DMRS), the PDCCH data signal having a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform, the PDCCH data signal and the PDCCH DMRS occupying the same time domain resource and non-overlapping frequency domain resource; demodulating the PDCCH signal.

2. A signal transmission method characterized by, The method applied to a second communication device comprises: generating a physical downlink control channel (PDCCH) signal, the PDCCH signal comprising a PDCCH data signal and a PDCCH demodulation reference signal (DMRS), the PDCCH data signal having a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform, the PDCCH data signal and the PDCCH DMRS occupying the same time domain resource and non-overlapping frequency domain resource; sending the PDCCH signal to a first communication device.

3. The method of claim 1 or 2, wherein, The frequency domain resource occupied by the PDCCH received by the first communication device is continuous.

4. The method of claim 3, wherein, The frequency domain resource occupied by the PDCCH DMRS comprises P subcarriers, and the interval between any two adjacent subcarriers in the P subcarriers is equal.

5. The method of claim 4, wherein, The frequency domain resource occupied by the PDCCH received by the first communication device comprises Q subcarriers, and the offset δ of the first subcarrier in the P subcarriers relative to the first subcarrier in the Q subcarriers is related to a first parameter, the first parameter being one or more of the following: an identifier of the first communication device, a cell identifier, a bandwidth part (BWP) identifier, a frame index, a subframe index, a slot index, or an OFDM symbol index.

6. The method of claim 5, wherein, The offset δ satisfies the following relationship: δ = X mod Δ, where X is calculated based on the first parameter, Δ represents the interval between any two adjacent subcarriers in the P subcarriers, and mod represents a modulo operation.

7. The method of claim 1 or 2, wherein, The PDCCH received by the first communication device occupies a plurality of non-continuous frequency domain subblocks, the interval between any two adjacent frequency domain subblocks in the plurality of non-continuous frequency domain subblocks is equal, and each frequency domain subblock comprises subcarriers for carrying the PDCCH DMRS.

8. The method of claim 7, wherein, The index γ of the first subcarrier in at least one subcarrier occupied by the PDCCH DMRS in each frequency domain subblock is related to a second parameter, the second parameter being one or more of the following: an identifier of the first communication device, a cell identifier, a bandwidth part (BWP) identifier, a frame index, a subframe index, a slot index, or an OFDM symbol index.

9. The method of claim 8, wherein, The index γ of the first subcarrier in at least one subcarrier occupied by the PDCCH DMRS in each frequency domain subblock satisfies the following relationship: γ = Y mod K, where Y is calculated based on the second parameter, K represents the number of subcarriers included in one frequency domain subblock, and mod represents a modulo operation.

10. The method of any one of claims 7 to 9, wherein, An interval between any two adjacent frequency domain sub-blocks in the plurality of non-continuous frequency domain sub-blocks is n*K, where K represents a number of sub-carriers included in one frequency domain sub-block, and n represents a maximum number of PDCCHs in frequency division.

11. The method of any one of claims 1 to 10, wherein, The PDCCH data signal comprises a plurality of first PDCCH data signals, and time division multiplexing is used between the plurality of first PDCCH data signals; and / or frequency division multiplexing is used between the plurality of first PDCCH data signals.

12. The method of claim 11, wherein, The frequency division multiplexing between the plurality of first PDCCH data signals is implemented based on an orthogonal cover code (OCC); and the OCC is related to one or more of the following: an interval between any two adjacent sub-carriers occupied by the PDCCH DMRS, and a relative position of the frequency domain resource occupied by the PDCCH DMRS.

13. The method of claim 11 or 12, wherein, The time division multiplexing is implemented before discrete Fourier transform (DFT).

14. The method of any one of claims 1 to 13, wherein, The PDCCH DMRS is generated based on a Zadoff-Chu sequence.

15. A communications device, characterized by A module for implementing the method of any one of claims 1, 3-14, or a module for implementing the method of any one of claims 2-14.

16. A communications device, characterized by A processor for invoking a computer program stored in a memory, so that the method of any one of claims 1, 3-14 is executed, or so that the method of any one of claims 2-14 is executed.

17. The communication apparatus of claim 16, wherein Further comprising a memory.

18. A computer-readable storage medium, characterized in that, The storage medium stores a computer program or instructions, and when the computer program or instructions are executed by a computer, the method of any one of claims 1, 3-14 is implemented, or the method of any one of claims 2-14 is implemented.

19. A computer program product, characterised in that, The computer program product comprises instructions, and when the instructions are run by a computer, the method of any one of claims 1, 3-14 is implemented, or the method of any one of claims 2-14 is implemented.

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