Signal transmission methods and apparatuses, devices, medium and chip

Abstract

The present application belongs to the field of wireless communications. Disclosed are signal transmission methods and apparatuses, devices, a medium, and a chip. A method comprises: sending at least one first downlink signal and / or at least one second downlink signal, the at least one second downlink signal being sent on the basis of at least one first uplink signal, a frequency domain resource corresponding to a time unit in which the at least one first downlink signal is located being used for uplink transmission and downlink transmission, and a frequency domain resource corresponding to a time unit in which the at least one first uplink signal is located being used for uplink transmission and downlink transmission.

Description

Signal transmission methods, devices, equipment, media and chips Technical Field

[0001] This application relates to the field of wireless communication, and in particular to a signal transmission method, apparatus, device, medium, and chip. Background Technology

[0002] Sub-band Full Duplex (SBFD) refers to a technology that allows network devices to transmit and receive simultaneously on different subbands within the same subframe, time slot, or symbol. It helps to solve problems such as weak uplink coverage, high uplink latency, and insufficient uplink capacity caused by limited uplink resource allocation. Summary of the Invention

[0003] This application provides a signal transmission method, apparatus, device, medium, and chip, the technical solution of which includes at least:

[0004] According to one aspect of the embodiments of this application, a signal transmission method is provided, the method being performed by a network device, the method comprising:

[0005] At least one first downlink signal and / or at least one second downlink signal are transmitted, wherein the at least one second downlink signal is transmitted based on at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink and downlink transmission, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission.

[0006] According to another aspect of the embodiments of this application, a signal transmission method is provided, the method being executed by a terminal device, the method comprising:

[0007] Send at least one first uplink signal and / or receive at least one second downlink signal; wherein the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission, and the at least one second downlink signal is sent according to the at least one first uplink signal.

[0008] According to one aspect of the embodiments of this application, a signal transmission apparatus is provided, the apparatus comprising: a transmitting module, configured to transmit at least one first downlink signal and / or at least one second downlink signal, wherein the at least one second downlink signal is transmitted based on at least one first uplink signal, and frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink transmission and downlink transmission, and frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission.

[0009] According to another aspect of the embodiments of this application, a signal transmission device is provided, the device comprising: a receiving module and / or a transmitting module, the transmitting module being configured to transmit at least one first uplink signal, and the receiving module being configured to receive at least one second downlink signal; wherein, the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

[0010] According to another aspect of the embodiments of this application, a network device is provided, the network device comprising: a processor; a transmitter connected to the processor; and a memory for storing executable instructions of the processor; wherein the transmitter is configured to transmit at least one first uplink signal and / or receive at least one second downlink signal; wherein the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

[0011] According to one aspect of the embodiments of this application, a terminal device is provided, the terminal device comprising: a processor; a receiver and / or a transmitter connected to the processor; a memory for storing executable instructions of the processor; wherein the receiver is configured to receive at least one second downlink signal, and the transmitter is configured to transmit at least one first uplink signal; wherein the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

[0012] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided, which stores at least one program that is loaded and executed by a processor to implement the signal transmission method as described in the foregoing aspects.

[0013] According to one aspect of the embodiments of this application, a computer program product is provided, the computer program product including computer instructions stored in a computer-readable storage medium, a processor retrieving the computer instructions from the computer-readable storage medium, and the processor executing the computer instructions to implement the signal transmission method as described in the above aspects.

[0014] According to one aspect of the embodiments of this application, a chip is provided, the chip including programmable logic circuitry and / or at least a program, the chip being executed to implement the signal transmission method as described in the above aspects.

[0015] The technical solutions provided in this application embodiment may include the following beneficial effects:

[0016] The system supports network devices transmitting at least one first downlink signal within the SBFD time unit and receiving at least one first uplink signal within the same time unit. This improves intra-system communication efficiency, eliminating the need for network devices to receive the first uplink signal via an additional time unit, thus saving power and reducing the interaction latency between uplink and downlink signals. Since the second downlink signal is transmitted based on the first uplink signal, it avoids the network device transmitting invalid or unnecessary second downlink signals, preventing waste of transmission resources. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 shows a schematic diagram of a wireless communication system provided in an exemplary embodiment of this application;

[0019] Figure 2 shows a schematic diagram of a time slot structure configuration provided in an exemplary embodiment of this application;

[0020] Figure 3 illustrates a schematic diagram of a semi-static configuration time slot format provided in an exemplary embodiment of this application;

[0021] Figure 4 shows a schematic diagram of the slot format of the SFI indication provided in an exemplary embodiment of this application;

[0022] Figure 5 shows a schematic diagram of a semi-static time-frequency resource pattern provided in an exemplary embodiment of this application;

[0023] Figure 6 shows a schematic diagram of the structure of an SSB provided in an exemplary embodiment of this application;

[0024] Figure 7 illustrates a schematic diagram of SSB transmission provided in an exemplary embodiment of this application;

[0025] Figure 8 illustrates a schematic diagram of a random access procedure provided in an exemplary embodiment of this application;

[0026] Figure 9 shows a flowchart illustrating a signal transmission method provided in an exemplary embodiment of this application;

[0027] Figure 10 shows a flowchart illustrating a signal transmission method provided in an exemplary embodiment of this application;

[0028] Figure 11 shows a schematic flowchart of a signal transmission method provided in an exemplary embodiment of this application;

[0029] Figure 12 shows a schematic diagram of the frequency domain resources corresponding to the SBFD time unit provided in an exemplary embodiment of this application;

[0030] Figure 13 shows a schematic flowchart of a signal transmission method provided in an exemplary embodiment of this application;

[0031] Figure 14 illustrates a signal transmission schematic diagram provided in an exemplary embodiment of this application;

[0032] Figure 15 shows a structural block diagram of a signal transmission device provided in an exemplary embodiment of this application;

[0033] Figure 16 shows a structural block diagram of a signal transmission device provided in an exemplary embodiment of this application;

[0034] Figure 17 shows a schematic diagram of the structure of a communication device provided in an exemplary embodiment of this application. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Exemplary embodiments will be described in detail here, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0036] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items, for example, A and / or B, which can represent three cases: A alone, A and B simultaneously, or B alone. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0037] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein can be interpreted as "in the case of," "when," or "in response to determination." In this specification, when expressing the meaning of Boolean values, "0" is expressed as "first meaning" and "1" as "second meaning." Without loss of generality, those skilled in the art will understand that the meanings they represent can be interchanged, i.e., "1" represents "first meaning" and "0" represents "second meaning."

[0038] It should be understood that the term "instruction" mentioned in the embodiments of this application can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0039] In the description of the embodiments of this application, the term "correspondence" may indicate that there is a direct or indirect correspondence between two things, or that there is an association between two things, or that there is a relationship of instruction and being instructed, configuration and being configured, etc.

[0040] In some embodiments of this application, "predefined" can be implemented by pre-storing corresponding codes, tables, or other means of indicating relevant information in communication devices (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, "predefined" can refer to what is defined in a protocol. Here, "protocol" can refer to standard protocols in the field of communication, such as LTE protocol, NR protocol, and related protocols applied to future communication systems. This application does not limit this.

[0041] Figure 1 illustrates a schematic diagram of a wireless communication system 100 provided in an exemplary embodiment of this application. The wireless communication system 100 includes terminal devices with terminal devices, or terminal devices with network devices, or stations (STAs) with stations; this application does not limit the specific types of devices. Figure 1 uses the example of a wireless communication system 100 including network devices 110 and terminal devices 120. The number of network devices 110 can be one or more, and the number of terminal devices 120 can be one or more.

[0042] Network device 110 supports wireless communication functions, including but not limited to: Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), Radio Network Controller (RNC), Base Station (BS), Base Station Controller (BSC), Base Transceiver Station (BTS), Home Evolved Node B (or Home Node B, HNB), Baseband Unit (BBU), Distributed Unit (DU), Wireless Relay Node, Wireless Backhaul Node, Transmission Point (TP), Transmission and Reception Point (TRP), Antenna Panel, Router, etc.

[0043] Terminal equipment 120, also known as user equipment (UE), includes, but is not limited to: mobile phones, tablets, e-book readers, laptops, desktop computers, televisions, virtual reality (VR) devices, augmented reality (AR) devices, mixed reality (MR) devices, extended reality (XR) devices, remote terminals, set-top boxes, vehicle communication equipment, handheld devices, wearable devices, wireless devices in industrial control, wireless devices in self-driving, wireless devices in remote medical care, wireless devices in smart grids, wireless devices in transportation safety, wireless devices in smart cities, wireless devices in smart homes (such as smart cameras, smart remote controls, smart water and electricity meters, etc.), wireless communication chips, application-specific integrated circuits (ASICs), systems-on-chips (SoCs), Internet of Things (IoT) nodes, and vehicle-to-everything (V2X) networks. It can be a node or sensor of a vehicle (IoV), or a computing device with wireless communication capabilities or other processing devices connected to a wireless modem.

[0044] In some embodiments, both network device 110 and UE 120 support the 3rd Generation Partnership Project (3GPP) protocol, but are not limited to the 3GPP protocol.

[0045] In some embodiments, the frequency bands supported by the wireless communication system 100 include, but are not limited to: Sub-6GHz bands (e.g., bands in the range of 450MHz-6 GHz), Sub-7GHz bands (e.g., bands in the range of 1 to 7.25GHz such as 2.4GHz, 5GHz, and 6GHz), and millimeter wave (mmWave) bands (e.g., bands in the range of 24.25 to 300GHz such as 26GHz, 28GHz, 39GHz, 45GHz, and 60GHz).

[0046] The technical solutions described in some embodiments of this application can be applied to various communication systems, such as: 6th-Generation (6G) systems, subsequent evolution systems of 6G, NR systems, evolution systems of NR systems, 5th-Generation (5G) systems, Beyond 5th-Generation (B5G) systems, Long Term Evolution (LTE) systems, Advanced Long Term Evolution (LTE-A) systems, LTE-based access to unlicensed spectrum (LTE-U) systems, NR-based access to unlicensed spectrum (NR-U) systems, cellular IoT systems, Wireless Local Area Networks (WLAN) systems, Wireless Fidelity (Wi-Fi) systems, Global System for Mobile Communication (GSM) systems, Code Division Multiple Access (CDMA) systems, and Wideband Code Division Multiple Access (CDMA) systems. Systems such as WCDMA (Wide-accessible communication network), General Packet Radio Service (GPRS), Terrestrial Networks (TN), and Non-Terrestrial Networks (NTN) are included.

[0047] The wireless communication system 100 is applicable to three communication scenarios: the first is the uplink (UL) transmission scenario, which refers to the scenario where the UE sends signals to the network device; the second is the downlink (DL) transmission scenario, which refers to the scenario where the network device sends signals to the UE; and the third is the sidelink transmission scenario, which refers to the scenario where the UE sends signals to other UEs.

[0048] Taking the NR system as an example, it supports network devices to send semi-static uplink / downlink configuration signaling and / or dynamic uplink / downlink indication signaling to configure the time slot structure for the UE.

[0049] Semi-static uplink / downlink configuration signaling includes tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated. tdd-UL-DL-ConfigurationCommon is used to configure a common time slot structure, i.e., a time slot structure applicable to all UEs within the cell. This signaling can configure one or two patterns, each corresponding to one period. Network devices can configure the time slot structure within each pattern, mainly including one or more of the following parameters: reference subcarrier spacing μ. ref Period (denoted as P, which is the period parameter of the pattern, in milliseconds (ms)), number of downlink time slots d slot Downlink symbol number d sym Uplink time slot number u slot Up row sign number u sym .

[0050] Based on the reference subcarrier spacing μ ref The period P can determine the total number S of time slots included in that period, and the first d of those S time slots... slot Each time slot represents a full downlink time slot, and the first d in the time slot following the last full downlink time slot. sym Each symbol represents a downlink symbol; the last u in the S time slots slot Each time slot represents a full uplink time slot, and the last u in the time slot preceding the first full uplink time slot... sym One symbol represents the uplink symbol; the remaining symbols in the cycle represent flexible symbols. Therefore, within a pattern cycle, the overall frame structure configuration is downlink time slots or downlink symbols first, uplink time slots or uplink symbols second, and flexible time slots or flexible symbols in between. The UE can determine the time slot structure within a cycle based on tdd-UL-DL-ConfigurationCommon, and the time slot structure of all time slots can be determined by repeating the cycle P in the time domain.

[0051] Figure 2 illustrates a time slot structure configuration of a pattern provided in an exemplary embodiment of this application. The pattern has a period P = 5ms. With a subcarrier spacing of 15kHz, one period of the pattern includes 5 time slots, where d slot =1,d sym =2, u slot =1, u sym=6. That is, within a 5ms period, the first time slot is a full downlink time slot, the first two symbols in the second time slot are downlink symbols, the last time slot is a full uplink time slot, the last six symbols in the penultimate time slot are uplink symbols, and the remaining symbols are flexible symbols. This pattern repeats periodically in the time domain at 5ms.

[0052] Network devices can simultaneously configure two patterns using tdd-UL-DL-ConfigurationCommon, with periods P and P2 respectively, and configure the time slot structure for each pattern. If a network device configures two patterns simultaneously, the total period (P+P2) of the two patterns is divisible by 20ms. The time slot structures of the two patterns repeat together in the time domain, that is, they repeat periodically in the time domain with a period (P+P2), thus determining the time slot structure for all time slots.

[0053] Network devices can configure the time slot structure for a UE using tdd-UL-DL-ConfigurationDedicated, a UE-specific Radio Resource Control (RRC) signaling. tdd-UL-DL-ConfigurationDedicated configures the time slot structure for a set of time slots within the period configured by tdd-UL-DL-ConfigurationCommon, primarily including the following parameters: time slot index and symbol direction. The time slot index parameter indicates a time slot within the period configured by tdd-UL-DL-ConfigurationCommon. The symbol direction parameter configures a set of symbols within the time slot. It can be used to configure the time slot corresponding to the time slot index parameter to include all downlink symbols (i.e., all symbols in the time slot corresponding to the time slot index parameter are downlink symbols), or to configure the time slot corresponding to the time slot index parameter to include all uplink symbols (i.e., all symbols in the time slot corresponding to the time slot index parameter are uplink symbols), or to configure the number of downlink symbols in the time slot corresponding to the time slot index parameter, or to configure the number of uplink symbols in the time slot corresponding to the time slot index parameter.

[0054] `tdd-UL-DL-ConfigurationDedicated` can only change the transmission direction of flexible symbols configured by `tdd-UL-DL-ConfigurationCommon`. Downlink symbols configured by `tdd-UL-DL-ConfigurationCommon` cannot be modified to uplink symbols by `tdd-UL-DL-ConfigurationDedicated`, and uplink symbols configured by `tdd-UL-DL-ConfigurationCommon` cannot be modified to downlink symbols by `tdd-UL-DL-ConfigurationDedicated`.

[0055] For example, a network device configures a pattern of time slot structure using tdd-UL-DL-ConfigurationCommon as shown in Figure 2. Based on this, the network device configures the time slot structure of two of the time slots using tdd-UL-DL-ConfigurationDedicated, as shown in Figure 3. Taking the two time slots configured by tdd-UL-DL-ConfigurationDedicated as time slot 1 and time slot 2 within a 5ms period as an example.

[0056] Based on the semi-static uplink / downlink configuration signaling for configuring the time slot structure, network devices can also dynamically indicate the time slot format for each time slot through a Slot Format Indicator (SFI). This SFI uses DCI format 2_0, and the Radio Network Temporary Identifier (RNTI) used for scrambling is SFI-RNTI. The dynamic SFI can only indicate the transmission direction of the flexible symbols configured in the semi-static uplink / downlink configuration signaling; it cannot change the transmission direction of the uplink or downlink symbols configured in the semi-static configuration signaling.

[0057] SFI can simultaneously indicate the slot format of multiple serving cells. Network devices can configure cell indexes and the position of the start bit of the corresponding slot format combination identifier (slotFormatCombinationId) in DCI format 2_0 via RRC signaling. The network device configures multiple slot format combinations (slotFormatCombination), each corresponding to an identifier (slotFormatCombinationId) and a set of slot format indicators. Each slot format indicator is used to indicate the slot format of one slot.

[0058] The SFI carries information including an SFI index, which corresponds to the slotFormatCombinationId. A set of time slot formats can be determined based on the SFI index. The time slot format indicated by the SFI applies to multiple consecutive time slots starting from the time slot carrying the SFI, and the number of time slots indicated by the SFI is greater than or equal to the monitoring period of the Physical Downlink Control Channel (PDCCH) carrying the SFI. If a time slot is indicated by two SFIs, the time slot format indicated by both SFIs should be identical.

[0059] When configuring the time slot format of a serving cell, network devices also configure a subcarrier spacing, namely the SFI reference subcarrier spacing μ. SFI μ SFI The subcarrier spacing μ of the serving cell for monitoring SFI is less than or equal to μ, i.e., μ ≥ μ SFI At this time, the slot format of a slot indicated by SFI is applicable to A series of consecutive time slots, and each downlink symbol indicated by SFI corresponds to A series of consecutive downlink symbols, each uplink symbol indicated by SFI corresponds to A series of consecutive uplink symbols, each flexible symbol indicated by SFI corresponds to A series of flexible symbols.

[0060] Figure 4 illustrates a schematic diagram of the slot format for SFI indication provided in an exemplary embodiment of this application. The ratio of downlink symbols, flexible symbols, and uplink symbols in a slot is DL:FL:UL = 4:7:3, that is, a slot includes 4 downlink symbols, 7 flexible symbols, and 3 uplink symbols, and is configured with μ SFI =0, meaning the corresponding subcarrier spacing is 15kHz. This SFI is used to indicate the slot format of a Time Division Duplex (TDD) cell, and the corresponding subcarrier spacing μ=1, meaning the corresponding subcarrier spacing is 30kHz. Then the slot format indicated by this SFI is applicable to two consecutive slots, and one downlink symbol indicated by the SFI corresponds to two consecutive downlink symbols in the time slot of this cell, one flexible symbol indicated by the SFI corresponds to two consecutive flexible symbols in the time slot of this cell, and one uplink symbol indicated by the SFI corresponds to two consecutive uplink symbols in the time slot of this cell.

[0061] Sub-band Full Duplex (SBFD) refers to a technology that allows simultaneous transmission and reception on different subbands within the same subframe, time slot, or symbol. It helps address issues such as weak uplink coverage, high uplink latency, and insufficient uplink capacity caused by limited uplink resource allocation. Optionally, SBFD technology may also be called Cross Division Duplex (XDD) technology.

[0062] As shown in Figure 5, network devices can semi-statically configure uplink sub-bands (UL Sub-bands) in the frequency domain resources corresponding to downlink symbols and flexible symbols. Furthermore, a guard band exists at the edge of the uplink sub-band. For downlink symbols (DL Symbols) configured with uplink sub-bands, such as symbol 2 and symbol 3, the network device can simultaneously perform uplink reception in the uplink sub-bands corresponding to symbol 2 and symbol 3, and downlink transmission in the downlink sub-bands (DL Sub-bands) corresponding to symbol 2 and symbol 3. The downlink sub-band refers to the downlink resources excluding the uplink sub-band and guard band. From the network device's perspective, it supports simultaneous uplink reception and downlink transmission in different frequency domain resources corresponding to the same time unit. However, for the UE, only half-duplex operation is possible in symbol 2 and symbol 3; that is, the UE can only transmit in the uplink sub-band corresponding to one time unit or receive in the downlink sub-band corresponding to one time unit. Therefore, SBFD technology can be considered primarily applied to the network device side.

[0063] For flexible symbols configured with uplink subbands, such as symbols 4-7, if symbols 4-7 are indicated as downlink symbols by the network device via tdd-UL-DL-ConfigurationDedicated or SFI, the network device can perform full-duplex operation in symbols 4-7, while the UE still performs half-duplex operation in symbols 4-7, similar to the behavior of the network device and UE in symbols 2 and 3. If symbols 4-7 are indicated as uplink symbols by the network device via tdd-UL-DL-ConfigurationDedicated or SFI, then symbols 4-7 are UL symbols, and the network device only performs uplink reception in symbols 4-7, and the UE only performs uplink transmission in symbols 4-7. The aforementioned downlink symbols and flexible symbols configured with uplink subbands can be referred to as SBFD symbols.

[0064] Furthermore, UEs that support receiving the aforementioned uplink subband configuration can be referred to as SBFD-aware UEs, while legacy UEs cannot understand the uplink subband configuration and can be referred to as SBFD-no-aware UEs. Taking symbol 2 as an example, from the perspective of an SBFD-aware UE, it understands that symbol 2 has uplink and downlink subbands. An SBFD-aware UE can transmit in the uplink subband corresponding to symbol 2 or receive in the downlink subband corresponding to symbol 2. From the perspective of an SBFD-no-aware UE, it understands symbol 2 as a downlink symbol, and an SBFD-no-aware UE will only perform downlink reception in symbol 2. Therefore, in symbol 2, the uplink transmission of an SBFD-aware UE and the downlink reception of an SBFD-no-aware UE may conflict and interfere with each other in the frequency domain resources corresponding to the uplink subband.

[0065] In summary, the introduction of SBFD technology enables network devices to transmit and receive simultaneously in different subbands within a single carrier corresponding to an SBFD symbol, which differs from the half-duplex operation where network devices can only transmit or receive within a single carrier corresponding to a single symbol.

[0066] Taking the NR system as an example, the initial access process of the UE is as follows: During the measurement and acquisition of system information phase, the UE searches for the downlink Synchronization Signal Block (SSB). The SSB can also be called the Synchronization Signal Block / PBCH Block (SS / PBCH Block). The structure of the SSB is shown in Figure 6, which includes the Primary Synchronization Signal (PSS), the Secondary Synchronization Signal (SSS), and the Physical Broadcast Channel (PBCH). The SSB occupies 240 subcarriers in the frequency domain. If a PRB includes 12 subcarriers, then it can also be said that the SSB occupies 20 PRBs in the frequency domain. Among them, the PSS and SSS sequence lengths are both 127, occupying 12 PRBs (including guard subcarriers) in the middle position in the frequency domain. Four PRBs are reserved on both sides of the PSS for protection in the frequency domain. The PBCH is located on the other PRBs excluding the SSS, PSS, and the eight PRBs on both sides. In addition to being used for related detection and downlink synchronization, PSS and SSS are also used to carry the cell ID, which identifies which network device in which cell sent the SSB. SSB supports UE in achieving time-frequency synchronization, obtaining MIB, and assisting in cell search, Radio Resource Management (RRM) / Radio Link Monitoring (RLM) measurements, etc.

[0067] The UE scans and measures the SSBs transmitted by network devices, evaluating signal quality (such as Layer 1 Reference Signal Received Power (L1-RSRP)) to select the optimal SSB for access. For the UE, the main functions of measuring and selecting the optimal SSB include: obtaining downlink synchronization, determining the uplink beam direction, and decoding the PBCH within the SSB. The PBCH includes higher-layer information, such as the Master Information Block (MIB), which contains scheduling information for the Physical Downlink Shared Channel (PDSCH) carrying System Information Block 1 (SIB1).

[0068] In 5G systems, coverage requirements are met by introducing a beam sweeping mechanism, essentially "trading time for space." To this end, 5G systems periodically transmit SSBs in the time domain in the form of SSB burst sets. Each SSB burst set contains multiple SSBs, all concentrated within a 5-millisecond (ms) range. Different SSBs may have different beam directions, thus achieving coverage in different directions. As shown in Figure 7, SSB burst sets are transmitted at a period of 20ms, and each SSB burst set contains 8 SSBs, corresponding to indices #0 to #7. Different SSBs target different beam directions, ensuring that UEs in different directions can receive SSBs with sufficiently high RSRP.

[0069] The period of the SSB burst set ranges from {5, 10, 20, 40, 80, 160} ms, and this period can be configured via higher-layer signaling. However, for UEs performing initial cell search, they cannot receive higher-layer signaling for configuring the SSB burst set period before searching for an SSB; therefore, a default period needs to be defined. In the NR system, the default period for the SSB burst set is defined as 20 ms for UEs performing initial cell search. When the higher-layer signaling received by the UE contains SSB burst set period information, the period of the SSB burst set can be determined through this higher-layer signaling; otherwise, the UE defaults to a period of 5 ms for the SSB burst set of the serving cell.

[0070] After selecting the best SSB, the UE decodes the PBCH to obtain the MIB. Based on the configuration information in the MIB and the system information transmission method agreed upon in the protocol, the UE blindly detects the PDCCH of the scheduling system information from the Control Resource Set (CORESET) #0 and the Search Space #0, and decodes the PDSCH carrying SIB1 from the PDCCH, thereby obtaining the configuration information of the Random Access Channel (RACH) in SIB1.

[0071] After the cell search process, the UE has achieved downlink synchronization with the cell, thus enabling it to receive downlink data. However, the UE can only perform uplink transmission after achieving uplink synchronization with the cell. The UE establishes a connection with the cell and achieves uplink synchronization through a random access procedure. In other words, through random access, the UE can obtain uplink synchronization and a unique identifier assigned to it by the network, namely the Cell Radio Network Temporary Identity (C-RNTI). Therefore, random access can be applied not only during initial access but also in cases where uplink synchronization is lost.

[0072] There are two types of random access procedures that a UE can use: a 4-step random access procedure and a 2-step random access procedure.

[0073] Referring to the four-step random access procedure shown in Figure 8(a), the network device first sends a downlink synchronization signal, such as an SSB. The UE obtains downlink synchronization by searching for the downlink synchronization signal, as well as some configuration information, such as resources for sending a preamble. Then, the UE randomly selects a preamble sequence and sends it to the network device. This preamble sequence is also called Message 1 (Msg1). Generally, different UEs select different preamble sequences during the random access procedure, but it is possible that different UEs might choose the same preamble sequence, i.e., there might be a Message 1 conflict. This needs to be resolved through signaling interaction between Message 3 (Msg3) and Message 4 (Msg4). Assuming UE 1 and UE 2 select the same preamble_1, after receiving Message 1, the network device sends back a Random Access Response (RAR), also known as Message 2 (Msg2). The RAR includes a Timing Advance (TA) for subsequent uplink transmissions by the UE, a Temporary Cell Radio Network Temporary Identifier (TC-RNTI) allocated to the UE, and also indicates the transmission resources for Message 3. It should be noted that if UE 1 and UE 2 select the same preamble sequence (e.g., preamble_1), then UE 1 and UE 2 will receive the same RAR (e.g., RAR_1) and the same TC-RNTI. Subsequently, both UE 1 and UE 2 will send Message 3 (e.g., Msg3_1) on the same resources based on the RAR's indication, carrying their respective ID information in their Message 3. If the network device successfully receives Message 3 from only one UE, taking Message 3 from UE 1 as an example, the network device will truncate Message 3 sent by UE 1 to 48 bits and send it as Message 4 (e.g., Msg4_1). After receiving Message 4, UE 1 compares its own Message 3 with the Message 4 fed back by the network side. If they match, the TC-RNTI previously obtained by UE 1 in RAR (i.e., RAR_1) is converted to a valid TC-RNTI and used for subsequent scheduling of UE 1, thus completing the random access process. However, after receiving Message 4, UE 2 determines that the Message 4 fed back by the network side does not match its own Message 3, and UE 2 needs to re-perform the random access process.If the network device successfully receives Message 3 from both UE 1 and UE 2 simultaneously, to ensure the uniqueness of the C-RNTI within the cell, the network device will only truncate Message 3 sent by either UE 1 or UE 2 to 48 bits for feedback. If the network device only feeds back the truncated bits of Message 3 from UE 1, UE 2 will need to re-enter random access; if the network device only feeds back the truncated bits of Message 3 from UE 2, UE 1 will need to re-enter random access. It is understandable that if there is no conflict in the preamble sequence, the UE selects a preamble sequence and obtains a unique C-RNTI through a four-step random access process.

[0074] Referring to the two-step random access procedure shown in Figure 8(b), the network device also first sends a downlink synchronization signal, such as an SSB. The UE obtains downlink synchronization by searching for the downlink synchronization signal, as well as some configuration information, such as the resources for sending the preamble. The main difference from the four-step random access procedure is that there is an association between the preamble resources and the Message 3 resources in the two-step random access procedure. This association is determined based on the configuration information carried by the downlink synchronization signal. Therefore, when the UE randomly selects the preamble sequence, it can directly determine the transmission resource location of Message 3. The UE sends the preamble sequence and Message 3, which are collectively referred to as Message A (Message A, MsgA). If UE 1 and UE 2 happen to select the same preamble sequence (such as Preamble_1) during the random access procedure, then UE 1 and UE 2 will send Message 3 (such as Msg_3) on the same resources, and carry their respective ID information in their Message 3. If the network device successfully receives Message A from only one UE, taking Message A from UE 1 as an example, the network device will truncate Message 3 sent by UE 1 to 48 bits and send it as part of Message B (Message B, MsgB) (e.g., MsgB_1). After receiving Message B, UE 1 compares its own Message 3 with the Message B returned by the network. If they match, UE 1 completes the random access procedure, and Message B also carries information such as C-RNTI and TA assigned to UE 1. However, after receiving Message B, UE 2 determines that the Message B returned by the network does not match its own Message 3, and UE 2 needs to re-enter the random access procedure. If the network device successfully receives Message A from both UE 1 and UE 2 simultaneously, to ensure the uniqueness of the C-RNTI within the cell, the network device will only truncate Message 3 sent by either UE 1 or UE 2 to 48 bits and feed it back as part of Message B. If the network device only feeds back the truncated bits of Message 3 from UE 1, UE 2 will need to re-enter random access; if the network device only feeds back the truncated bits of Message 3 from UE 2, UE 1 will need to re-enter random access. It is understandable that if there is no conflict in the preamble sequence, the UE will obtain unique C-RNTI and TA information after selecting the preamble sequence and undergoing a two-step random access process.

[0075] In both the 2-step and 4-step random access procedures described above, the resources used by the UE to transmit the preamble are called the Random Access Channel Occasion (RO). The UE obtains the time-frequency resources of the RO according to the indication field in SIB 1. In the 2-step random access procedure, the resources used by the UE to transmit the Physical Uplink Shared Channel (PUSCH) in Message A are called the PUSCH Occasion (PO). This PO is also obtained by the UE according to the indication field in SIB 1. In the RO and / or PO indicated by SIB 1, the distance from the last symbol of the configured SSB must be at least N. gap A valid RO is defined as a RO consisting of at least N OFDM symbols and / or is at least N away from the last symbol of the configured SSB. gap A valid PO is defined as a PO containing at least N OFDM symbols. In other words, a PO must be less than N symbols away from the last symbol of the configured SSB. gap The RO of an OFDM symbol is not a valid RO, and / or the distance between it and the last symbol of the configured SSB is less than N. gap A single OFDM symbol's PO is not a valid PO. The UE can only transmit within a valid RO and / or a valid PO. Furthermore, a valid RO and / or a valid PO cannot be located in the same time slot as an SSB.

[0076] As described above, the UE access process requires network equipment to periodically send SSBs, which inevitably leads to a waste of transmission resources and power consumption. In future communication systems (such as 6G and its subsequent evolution systems), SBFD technology can be considered to reduce the waste of transmission resources during the access process and improve energy saving on both the network and UE sides. Furthermore, since the UE may only support half-duplex operation, the UE's sending and receiving behavior also needs further design.

[0077] Figure 9 shows a schematic flowchart of a signal transmission method provided in an exemplary embodiment of this application, which is applied to the wireless communication system shown in Figure 1. The method is executed by a network device and includes at least some of the following steps:

[0078] Step 920: The network device sends at least one first downlink signal and / or at least one second downlink signal, wherein the at least one second downlink signal is sent according to at least one first uplink signal, and the frequency domain resources corresponding to the time unit where the at least one first downlink signal is located are used for uplink and downlink transmission, and the frequency domain resources corresponding to the time unit where the at least one first uplink signal is located are used for uplink and downlink transmission.

[0079] In the embodiments of this application, "at least one" means one or more, and "multiple" means two or more. Therefore, at least one first downlink signal means one or more first downlink signals, at least one second downlink signal means one or more second downlink signals, and at least one first uplink signal means one or more first uplink signals.

[0080] In some embodiments, at least one first downlink signal can also be understood as a whole, such as: the network device sends a set of first downlink signals, which includes one or more first downlink signals; or the network device sends a cluster of first downlink signals, which includes one or more first downlink signals.

[0081] In some embodiments, at least one second downlink signal can also be understood as a whole, such as: the network device sends a set of second downlink signals, which includes one or more second downlink signals; or the network device sends a cluster of second downlink signals, which includes one or more second downlink signals.

[0082] The frequency domain resources corresponding to at least one time unit containing a first downlink signal are used for both uplink and downlink transmission. This can also be understood as the frequency domain resources corresponding to at least one time unit containing a first downlink signal including both uplink and downlink resources. Similarly, the frequency domain resources corresponding to at least one time unit containing a first uplink signal are used for both uplink and downlink transmission.

[0083] The corresponding frequency domain resources used for uplink and downlink transmission time units are called SBFD time units, representing time units employing SBFD technology. In this application embodiment, a time unit includes one or more of the following: symbol, symbol group, time slot, sub-time slot, subframe, and frame. SBFD time units may include, for example, SBFD symbols, SBFD symbol groups, SBFD time slots, SBFD subframes, SBFD sub-time slots, or SBFD frames. For example, at least one first downlink signal is located in an SBFD symbol, SBFD symbol group, SBFD time slot, SBFD subframe, SBFD sub-time slot, or SBFD frame, and at least one first uplink signal is located in an SBFD symbol, SBFD symbol group, SBFD time slot, SBFD subframe, SBFD sub-time slot, or SBFD frame.

[0084] Network devices can simultaneously receive uplink resources and transmit downlink resources in the corresponding SBFD time unit. In other words, network devices support receiving uplink signals while transmitting at least one first downlink signal in the SBFD time unit (but this does not mean that network devices necessarily receive uplink signals while transmitting first downlink signals), and also support transmitting downlink signals while receiving at least one first uplink signal in the SBFD time unit (but this does not mean that network devices necessarily transmit downlink signals while receiving first uplink signals).

[0085] In this embodiment of the application, the network device can be implemented as the network device 110 shown in FIG1.

[0086] In summary, the method provided in this application embodiment supports network devices in transmitting at least one first downlink signal within the SBFD time unit and receiving at least one first uplink signal within the time unit of transmitting at least one first downlink signal, thereby improving communication efficiency within the system. This eliminates the need for network devices to receive the first uplink signal through an additional time unit, saving power and reducing the interaction latency between uplink and downlink signals. Since the second downlink signal is transmitted based on the first uplink signal, i.e., the transmission of the second downlink signal is indicated or triggered by the UE side, it can prevent network devices from transmitting invalid second downlink signals that are not needed by the UE, thus avoiding waste of transmission resources.

[0087] Figure 10 shows a flowchart illustrating a signal transmission method provided in an exemplary embodiment of this application, which is applied to the wireless communication system shown in Figure 1. The method is executed by the UE and includes at least some of the following steps:

[0088] Step 1020: The UE sends at least one first uplink signal and / or receives at least one second downlink signal; wherein, the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission, and the at least one second downlink signal is sent according to the at least one first uplink signal.

[0089] In the embodiments of this application, "at least one" means one or more, and "multiple" means two or more. Therefore, at least one first downlink signal means one or more first downlink signals, at least one second downlink signal means one or more second downlink signals, and at least one first uplink signal means one or more first uplink signals.

[0090] In some embodiments, at least one second downlink signal can also be understood as a whole, such as: the network device sends a set of second downlink signals, which includes one or more second downlink signals; or the network device sends a cluster of second downlink signals, which includes one or more second downlink signals.

[0091] The frequency domain resources corresponding to at least one time unit where the first uplink signal is located are used for uplink and downlink transmission. This can also be understood as the frequency domain resources corresponding to at least one time unit where the first uplink signal is located include uplink resources and downlink resources.

[0092] The corresponding frequency domain resources used for uplink and downlink transmission time units are called SBFD time units, representing time units employing SBFD technology. In this application embodiment, a time unit includes one or more of the following: symbol, symbol group, time slot, sub-time slot, subframe, and frame. SBFD time units may include, for example, SBFD symbols, or SBFD symbol groups, or SBFD time slots, or SBFD subframes, or SBFD sub-time slots, or SBFD frames. For example, at least one first uplink signal is located in an SBFD symbol, or SBFD symbol group, or SBFD time slot, or SBFD subframe, or SBFD sub-time slot, or SBFD frame.

[0093] In this embodiment, the UE is an SBFD-aware UE, meaning the UE understands that the frequency domain resources corresponding to the SBFD time unit include both uplink and downlink resources. However, this application does not exclude the possibility of SBFD-unaware UEs existing in the system. For SBFD-unaware UEs, the frequency domain resources corresponding to the SBFD time unit may only include downlink resources or only uplink resources. Furthermore, regardless of whether the UE is SBFD-aware or not, it can only perform uplink transmission or only downlink reception in the SBFD time unit. In other words, regardless of whether the UE is aware of the SBFD, it can only perform half-duplex communication in the SBFD time unit. The network device can simultaneously receive uplink resources and transmit downlink resources corresponding to the SBFD time unit. That is, the network device supports receiving at least one first uplink signal while simultaneously transmitting a downlink signal in the SBFD time unit (but this does not mean that the network device necessarily transmits a downlink signal while receiving the first uplink signal).

[0094] In this embodiment of the application, the UE can be implemented as the terminal device 120 shown in FIG1.

[0095] In summary, the method provided in this application supports the UE to transmit at least one first uplink signal in the SBFD time unit, and the network device to transmit at least one first downlink signal in the time unit. The network device can also receive at least one first uplink signal, improving intra-system communication efficiency. This eliminates the need for the network device to receive the first uplink signal through an additional time unit, saving power and reducing the interaction latency between uplink and downlink signals. Since the second downlink signal is transmitted based on the first uplink signal, i.e., the transmission of the second downlink signal is indicated or triggered by the UE, it avoids the network device transmitting invalid or unnecessary second downlink signals, thus preventing the waste of transmission resources.

[0096] Furthermore, based on the embodiments shown in Figures 9 and 10, this application also provides specific designs for the first downlink signal, the first uplink signal, and the second downlink signal, as shown in the embodiments shown in Figures 11 and 13.

[0097] Figure 11 shows a flowchart of a signal transmission method provided in an exemplary embodiment of this application, which is applied to the wireless communication system shown in Figure 1. The method is executed by a network device and includes at least some of the following steps:

[0098] Step 1120: The network device sends at least one first downlink signal, and the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink and downlink transmission.

[0099] At least one first downlink signal is located in an SBFD time unit, that is, the time unit in which at least one first downlink signal is located supports SBFD technology. For example, at least one first downlink signal is located in an SBFD symbol, or an SBFD symbol group, or an SBFD time slot, or an SBFD subframe, or an SBFD sub-time slot, or an SBFD frame.

[0100] Figure 12 illustrates a schematic diagram of an SBFD time unit provided in an exemplary embodiment of this application. The frequency domain resources corresponding to the SBFD time unit include uplink resources and downlink resources. Further, a guard band may or may not exist between the uplink and downlink resources; the figure shows the case where a guard band exists. The uplink resources may be located in the middle or edge portion of the frequency domain resources corresponding to the SBFD time unit. Uplink resources can also be referred to as uplink sub-bands, and downlink resources can also be referred to as downlink sub-bands.

[0101] In Figure 12(a), the uplink resource is located in the middle part of the frequency domain resource corresponding to the SBFD time unit, and the upper and lower edges of the frequency domain resource corresponding to the SBFD time unit are both downlink resources. In Figure 12(b), the uplink resource is located in the upper edge of the frequency domain resource corresponding to the SBFD time unit, and the remaining resources, excluding the uplink resource and the guard band, are downlink resources. In Figure 12(c), the uplink resource is located in the lower edge of the frequency domain resource corresponding to the SBFD time unit, and the remaining resources, excluding the uplink resource and the guard band, are downlink resources.

[0102] In Figure 12(d), the downlink resource is located in the middle part of the frequency domain resource corresponding to the SBFD time unit, and the upper and lower edges of the frequency domain resource corresponding to the SBFD time unit are both uplink resources. In Figure 12(e), the downlink resource is located in the upper edge of the frequency domain resource corresponding to the SBFD time unit, and the remaining resources, excluding the downlink resource and the guard band, are uplink resources. In Figure 12(f), the downlink resource is located in the lower edge of the frequency domain resource corresponding to the SBFD time unit, and the remaining resources, excluding the downlink resource and the guard band, are uplink resources.

[0103] In some embodiments, at least one first downlink signal can also be understood as a whole, such as: the network device sends a set of first downlink signals, which includes one or more first downlink signals; or the network device sends a cluster of first downlink signals, which includes one or more first downlink signals.

[0104] In some embodiments, the network device transmits at least one first downlink signal via at least one beam, with each beam corresponding to one or more first downlink signals. Alternatively, the network device transmits at least one first downlink signal via at least one spatial transmission filter, with each spatial transmission filter corresponding to one or more first downlink signals.

[0105] In some embodiments, the first downlink signal includes one or more of the following: a synchronization signal, a PSS, an SSS, and a PBCH. For example, the first downlink signal includes a synchronization signal. Another example is that the first downlink signal includes a PSS and / or an SSS. Yet another example is that the first downlink signal includes a synchronization signal and a PBCH. Still another example is that the first downlink signal includes a PSS, an SSS, and a PBCH.

[0106] In some embodiments, the transmission overhead of the first downlink signal is less than the transmission overhead of the second downlink signal.

[0107] In some embodiments, the first downlink signal corresponds to a first capability set, which can also be understood as the first downlink signal being related to the first capability set; it can also be understood as the first downlink signal supporting reception by the UE corresponding to the first capability set; it can also be understood as the UE possessing the device capabilities included in the first capability set supporting reception of the first downlink signal; it can also be understood as the first downlink signal supporting transmission by the network device corresponding to the first capability set; it can also be understood as the network device possessing the device capabilities included in the first capability set supporting transmission of the first downlink signal; it can also be understood as the network device transmitting the first downlink signal when operating within the device capabilities included in the first capability set; it can also be understood as the UE receiving the first downlink signal when operating within the device capabilities included in the first capability set. The first capability set is a subset of the second capability set, or the capabilities included in the first capability set are lower than those included in the second capability set.

[0108] The first capability set includes device capabilities that support the use of UEs and / or network devices, and the second capability set includes device capabilities that support the use of UEs and / or network devices, where "device" includes network devices and / or UEs.

[0109] For example, the first capability set includes one or more of the following device capabilities: supporting a first bandwidth, supporting a first number of antennas, supporting a first MCS, and supporting a first data rate. The second capability set includes one or more of the following device capabilities: supporting a second bandwidth, supporting a second number of antennas, supporting a second MCS, and supporting a second data rate. If the device capabilities included in the first capability set are lower than those included in the second capability set, then the first bandwidth is less than the second bandwidth, and / or the first number of antennas is less than the second number of antennas, and / or the order of the first MCS is lower than the order of the second MCS (or the index of the first MCS is less than the index of the second MCS), and / or the first data rate is less than the second data rate.

[0110] For example, the first set of capabilities is the set of minimum device capabilities, such as the minimum kernel device capabilities, for instance, supporting narrowband transmission and reception at 3MHz / 5MHz. The second set of capabilities is the set of full device capabilities, such as full kernel / large kernel device capabilities. Large kernel device capabilities include not only the minimum kernel device capabilities but also additional device capabilities, such as supporting one or more of the following: wideband transmission and reception, a larger number of antennas, higher-order MCS, and higher data rates. Full kernel device capabilities encompass minimum kernel device capabilities; that is, minimum kernel device capabilities are a subset of full kernel device capabilities.

[0111] For example, the second capability set includes one or more of the following device capabilities: supporting a first bandwidth and a second bandwidth, supporting a first number of antennas and a second number of antennas, supporting a first MCS and a second MCS, and supporting a first data rate and a second data rate. The first capability set includes one or more of the following device capabilities: supporting a second bandwidth, supporting a second number of antennas, supporting a second MCS, and supporting a second data rate. The first capability set is a subset of the second capability set.

[0112] In some embodiments, the bandwidth corresponding to the first downlink signal is less than the bandwidth corresponding to the second downlink signal. For example, the bandwidth occupied by the first downlink signal is less than the bandwidth occupied by the second downlink signal. For example, the bandwidth of the PBCH included in the first downlink signal is less than the bandwidth of the PBCH included in the second downlink signal.

[0113] In some embodiments, the network device transmits at least one first downlink signal in a first downlink resource, the first downlink resource including one or more SBFD time units, which can also be understood as the first downlink resource corresponding to one or more SBFD time units in the time domain.

[0114] Step 1140: The network device receives at least one first uplink signal, and the frequency domain resources corresponding to the time unit where the at least one first uplink signal is located are used for uplink transmission and downlink transmission.

[0115] The first uplink signal is used to request the transmission of at least one second downlink signal, or the first uplink signal is used to trigger the transmission of at least one second downlink signal.

[0116] During the transmission of at least one first downlink signal, the network device receives at least one first uplink signal. For example, the network device receives at least one first uplink signal within a first time unit containing at least one first downlink signal. The frequency domain resources corresponding to the first time unit are used for both uplink and downlink transmission; that is, the first time unit is an SBFD time unit (such as an SBFD symbol, or SBFD symbol group, or SBFD time slot, or SBFD subframe, or SBFD sub-time slot, or SBFD frame).

[0117] In some embodiments, the network device receives multiple first uplink signals from the same UE or from different UEs.

[0118] In some embodiments, the network device receives at least one first uplink signal through at least one beam, with each beam corresponding to one and each first uplink signal. Alternatively, the network device receives at least one first uplink signal through at least one spatial transmission filter, with each spatial transmission filter corresponding to one and each first uplink signal. Alternatively, the network device receives at least one first uplink signal through a single beam, with each beam corresponding to one and each first uplink signal. Alternatively, the network device receives at least one first uplink signal through a single spatial transmission filter, with each spatial transmission filter corresponding to one and each first uplink signal. Alternatively, the network device receives at least one first uplink signal without using a beam or a spatial transmission filter.

[0119] Step 1160: The network device sends at least one second downlink signal based on at least one first uplink signal.

[0120] Upon receiving at least one first uplink signal, the network device sends at least one second downlink signal.

[0121] In some embodiments, the second time unit containing at least one second downlink signal is associated with the first time unit containing at least one first downlink signal and / or the first time unit containing at least one first uplink signal. The frequency domain resources corresponding to the second time unit are used for both uplink and downlink transmission, or the frequency domain resources corresponding to the second time unit are used only for downlink transmission. That is, the second time unit can be an SBFD time unit or a downlink time unit.

[0122] In some embodiments, the network device transmits at least one second downlink signal in a portion of the second time units associated with the first time unit where at least one first downlink signal is located; or, the network device transmits at least one second downlink signal in all the second time units associated with the first time unit where at least one first downlink signal is located; or, the network device transmits at least one second downlink signal in a portion of the second time units associated with the first time unit where at least one first uplink signal is located; or, the network device transmits at least one second downlink signal in all the second time units associated with the first time unit where at least one first uplink signal is located.

[0123] In some embodiments, at least one first downlink signal is transmitted on a first downlink resource, at least one first uplink signal is transmitted on a first uplink resource, and at least one second downlink signal is transmitted on a second downlink resource. The second downlink resource is associated with the first downlink resource and / or the first uplink resource.

[0124] In some embodiments, the network device sends at least one second downlink signal on a portion of the second downlink resources associated with the first downlink resource, or the network device sends at least one second downlink signal on all the second downlink resources associated with the first downlink resource, or the network device sends at least one second downlink signal on a portion of the second downlink resources associated with the first uplink resource, or the network device sends at least one second downlink signal on all the second downlink resources associated with the first uplink resource.

[0125] In some embodiments, at least one first downlink signal and at least one first uplink signal are transmitted within a first period, and the network device transmits at least one second downlink signal using a portion of its second downlink resources within the first period, or the network device transmits at least one second downlink signal using all of its second downlink resources within the first period, or the network device transmits at least one second downlink signal using a portion of its second time units within the first period, or the network device transmits at least one second downlink signal using all of its second time units within the first period.

[0126] In some embodiments, at least one second downlink signal is associated with at least one first downlink signal and / or at least one first uplink signal.

[0127] In some embodiments, the network device transmits at least a portion of the second downlink signal associated with a first downlink signal, or the network device transmits all of the second downlink signals associated with at least a first downlink signal, or the network device transmits at least a portion of the second downlink signal associated with a first uplink signal, or the network device transmits all of the second downlink signals associated with at least a first uplink signal.

[0128] In some embodiments, if a network device receives a first uplink signal in a first time unit, it sends at least one second downlink signal on the second downlink resource corresponding to the first time unit.

[0129] In some embodiments, if a network device receives a first uplink signal in a first time unit, it will send at least one second downlink signal on all second downlink resources in the current period.

[0130] In some embodiments, if a network device receives a first uplink signal while transmitting a first downlink signal within a first time unit, the network device then transmits a second downlink signal associated with the first downlink signal. Optionally, the network device uses the same beam or spatial transmission filter to transmit both the first downlink signal and the second downlink signal associated with the first downlink signal.

[0131] In some embodiments, if a network device receives a first uplink signal while transmitting a first downlink signal within a first time unit, the network device then transmits a second downlink signal associated with the first uplink signal. Optionally, the network device uses the same beam or spatial transmission filter to transmit both the first downlink signal and the second downlink signal associated with the first uplink signal.

[0132] In some embodiments, if a network device receives a first uplink signal while transmitting a first downlink signal in a first time unit, the network device then transmits all second downlink signals associated with the first downlink signal.

[0133] In some embodiments, if a network device receives a first uplink signal while transmitting a first downlink signal in a first time unit, the network device then transmits all second downlink signals associated with the first uplink signal.

[0134] In some embodiments, at least one second downlink signal can also be understood as a whole, such as: the network device sends a set of second downlink signals, which includes one or more second downlink signals; or the network device sends a cluster of second downlink signals, which includes one or more second downlink signals.

[0135] In some embodiments, the network device transmits at least one second downlink signal via at least one beam, with each beam corresponding to one or more second downlink signals. Alternatively, the network device transmits at least one second downlink signal via at least one spatial transmission filter, with each spatial transmission filter corresponding to one or more second downlink signals.

[0136] In some embodiments, the second downlink signal includes one or more of the following: a synchronization signal, a PSS, an SSS, a PBCH, and system information. For example, the second downlink signal includes a PBCH. Another example is that the second downlink signal includes a synchronization signal and a broadcast channel. Yet another example is that the second downlink signal includes a PSS and a PBCH, or an SSS and a PBCH, or a PSS, an SSS, and a PBCH. Yet another example is that the second downlink signal includes system information. Yet another example is that the second downlink signal includes a PBCH and system information. Yet another example is that the second downlink signal includes a synchronization signal, a PBCH, and system information. Yet another example is that the second downlink signal includes a PSS, an SSS, a PBCH, and system information.

[0137] In some embodiments, the transmission overhead of the second downlink signal is greater than the transmission overhead of the first downlink signal.

[0138] In some embodiments, the second downlink signal corresponds to a second capability set. This can also be understood as the second downlink signal being related to the second capability set; it can also be understood as the second downlink signal supporting reception by the UE corresponding to the second capability set; it can also be understood as a UE possessing the device capabilities included in the second capability set supporting reception of the second downlink signal; it can also be understood as the second downlink signal supporting transmission by the network device corresponding to the second capability set; it can also be understood as a network device possessing the device capabilities included in the second capability set supporting transmission of the second downlink signal; it can also be understood as the network device transmitting the second downlink signal when operating within the device capabilities included in the second capability set; and it can also be understood as the UE receiving the second downlink signal when operating within the device capabilities included in the second capability set. The first capability set is a subset of the second capability set, or the device capabilities included in the first capability set are lower than those included in the second capability set. For specific examples, please refer to the examples described above; further details are omitted here.

[0139] In some embodiments, the bandwidth corresponding to the second downlink signal is greater than the bandwidth corresponding to the first downlink signal. For example, the bandwidth occupied by the second downlink signal is greater than the bandwidth occupied by the first downlink signal. For example, the bandwidth of the PBCH included in the second downlink signal is greater than the bandwidth of the PBCH included in the first downlink signal.

[0140] In some embodiments, after sending at least one second downlink signal, the network device receives at least one second uplink signal.

[0141] In some embodiments, the second uplink signal is transmitted within a second uplink resource. The second uplink resource includes a RACH Occasion (RO), and the second uplink signal includes a preamble and / or message 3 (Msg3); or, the second uplink resource includes a PUSCH Occasion (PO), and the second uplink signal is transmitted in the PUSCH, the second uplink signal being message A (MsgA), which includes a preamble and Msg3 or only Msg3.

[0142] In this embodiment of the application, the network device can be implemented as the network device 110 shown in FIG1.

[0143] In summary, the method provided in this application, benefiting from the characteristics of SBFD technology, allows the network device to receive at least one first uplink signal while transmitting at least one first downlink signal in the SBFD time unit, and to transmit at least one second downlink signal based on the at least one first uplink signal. This eliminates the need for the network device to receive the first uplink signal through an additional time unit, effectively saving power, improving access efficiency, and reducing access latency. Since the second downlink signal is transmitted based on the first uplink signal, it avoids the network device transmitting invalid or unnecessary second downlink signals, preventing waste of transmission resources during the access process, and eliminating the need to set a separate time unit for listening to the first uplink signal. Because the first downlink signal is simpler or has lower transmission overhead than the second downlink signal, designing the second downlink signal as an on-demand transmission mode can eliminate the transmission of some complex signals, thereby saving energy. Optionally, due to the simple structure of the first downlink signal, the network device can transmit the first downlink signal without activating the Base Band Unit (BBU), further improving power saving.

[0144] Figure 13 shows a flowchart illustrating a signal transmission method provided in an exemplary embodiment of this application, which is applied to the wireless communication system shown in Figure 1. The method is executed by the UE and includes at least some of the following steps:

[0145] Step 1320: The UE sends at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission.

[0146] The first uplink signal is used to request the transmission of at least one second downlink signal, or the first uplink signal is used to trigger the transmission of at least one second downlink signal.

[0147] At least one first uplink signal is located in an SBFD time unit, meaning that the time unit containing at least one first uplink signal supports SBFD technology. For example, at least one first uplink signal is located in an SBFD symbol, or an SBFD symbol group, or an SBFD time slot, or an SBFD subframe, or an SBFD sub-time slot, or an SBFD frame. A schematic diagram of an SBFD time unit can be found in Figure 12.

[0148] In some embodiments, during the transmission of at least one first uplink signal, the network device also transmits at least one first downlink signal. Exemplarily, the first time unit containing the at least one first uplink signal is also used by the network device to transmit at least one first downlink signal. The frequency domain resources corresponding to the first time unit are used for both uplink and downlink transmission; that is, the first time unit is an SBFD time unit.

[0149] In this embodiment, the UE is an SBFD-aware UE, meaning the UE understands that the frequency domain resources corresponding to the first time unit include both uplink and downlink resources. However, this application does not exclude the possibility of SBFD-unaware UEs existing in the system. For SBFD-unaware UEs, the frequency domain resources corresponding to the first time unit may only include downlink resources or only uplink resources. Furthermore, regardless of whether the UE is SBFD-aware or not, it can only perform uplink transmission or only downlink reception in the SBFD time unit. In other words, regardless of whether the UE is aware of SBFD, it can only perform half-duplex communication in the SBFD time unit. For the UE sending the first uplink signal, it can only send at least one first uplink signal in the first time unit; for the UE receiving the first downlink signal, it can only receive at least one first downlink signal in the first time unit.

[0150] In some embodiments, the first downlink signal includes one or more of the following: a synchronization signal, a PSS, an SSS, and a PBCH. For example, the first downlink signal includes a synchronization signal. Another example is that the first downlink signal includes a PSS and / or an SSS. Yet another example is that the first downlink signal includes a synchronization signal and a PBCH. Still another example is that the first downlink signal includes a PSS, an SSS, and a PBCH.

[0151] In some embodiments, the UE transmits at least one first uplink signal in a first uplink resource. The first uplink resource includes one or more SBFD time units (such as a first time unit). It can also be understood that the first uplink resource corresponds to one or more SBFD time units in the time domain. The first uplink resource is predefined by the communication protocol, or preconfigured, or configured by the network device, or determined by the UE according to the configuration of neighboring cells, or depends on the UE implementation.

[0152] In some embodiments, the multiple first uplink signals transmitted by the UE are located in the same first uplink resource or different first uplink resources. For example, the UE transmits one or more first uplink signals in first uplink resource 1. Or, for another example, the UE transmits one or more first uplink signals in first uplink resource 1 and one or more first uplink signals in first uplink resource 2. The different first uplink resources may be continuous or discontinuous in the time domain.

[0153] In some embodiments, the multiple first uplink signals transmitted by the UE are located in the same SBFD time unit or different SBFD time units. For example, the UE transmits one or more first uplink signals within one SBFD time slot. Another example is that the UE transmits one or more first uplink signals in SBFD time slot 1 and one or more first uplink signals in SBFD time slot 2. Yet another example is that the UE transmits one or more first uplink signals in SBFD symbol 1 and one or more first uplink signals in SBFD symbol 2. The different SBFD time units may be continuous or discontinuous in the time domain.

[0154] In some embodiments, the UE transmits at least one first uplink signal through at least one beam, with each beam corresponding to one and each first uplink signal. Alternatively, the UE transmits at least one first uplink signal through at least one spatial transmission filter, with each spatial transmission filter corresponding to one and each first uplink signal. Alternatively, the UE transmits at least one first uplink signal through a single beam, with each beam corresponding to one and each first uplink signal. Alternatively, the UE transmits at least one first uplink signal through a single spatial transmission filter, with each spatial transmission filter corresponding to one and each first uplink signal. Alternatively, the UE transmits at least one first uplink signal without using a beam or a spatial transmission filter.

[0155] Step 1340: The UE receives at least one second downlink signal.

[0156] At least one second downlink signal is sent by the network device based on at least one first uplink signal.

[0157] In some embodiments, the second downlink signal includes one or more of the following: a synchronization signal, a PSS, an SSS, a PBCH, and system information. For example, the second downlink signal includes a PBCH. Another example is that the second downlink signal includes a synchronization signal and a broadcast channel. Yet another example is that the second downlink signal includes a PSS and a PBCH, or an SSS and a PBCH, or a PSS, an SSS, and a PBCH. Yet another example is that the second downlink signal includes system information. Yet another example is that the second downlink signal includes a PBCH and system information. Yet another example is that the second downlink signal includes a synchronization signal, a PBCH, and system information. Yet another example is that the second downlink signal includes a PSS, an SSS, a PBCH, and system information.

[0158] In some embodiments, the transmission overhead of the second downlink signal is greater than the transmission overhead of the first downlink signal.

[0159] In some embodiments, the second downlink signal corresponds to a second capability set, which can also be understood as the second downlink signal being related to the second capability set; it can also be understood as the second downlink signal supporting reception by the UE corresponding to the second capability set; it can also be understood as the UE possessing the device capabilities included in the second capability set supporting reception of the second downlink signal; it can also be understood as the second downlink signal supporting transmission by the network device corresponding to the second capability set; it can also be understood as the network device possessing the device capabilities included in the second capability set supporting transmission of the second downlink signal; it can also be understood as the network device transmitting the second downlink signal when operating within the device capabilities included in the second capability set; it can also be understood as the UE receiving the second downlink signal when operating within the device capabilities included in the second capability set. The first capability set is a subset of the second capability set, or the device capabilities included in the first capability set are lower than those included in the second capability set.

[0160] The first capability set includes device capabilities that support the use of UEs and / or network devices, and the second capability set includes device capabilities that support the use of UEs and / or network devices, where "device" includes network devices and / or UEs.

[0161] For example, the first capability set includes one or more of the following device capabilities: supporting a first bandwidth, supporting a first number of antennas, supporting a first MCS, and supporting a first data rate. The second capability set includes one or more of the following device capabilities: supporting a second bandwidth, supporting a second number of antennas, supporting a second MCS, and supporting a second data rate. If the device capabilities included in the first capability set are lower than those included in the second capability set, then the first bandwidth is less than the second bandwidth, and / or the first number of antennas is less than the second number of antennas, and / or the order of the first MCS is lower than the order of the second MCS (or the index of the first MCS is less than the index of the second MCS), and / or the first data rate is less than the second data rate.

[0162] For example, the first set of capabilities is the set of minimum device capabilities, such as the minimum kernel device capabilities, for instance, supporting narrowband transmission and reception at 3MHz / 5MHz. The second set of capabilities is the set of full device capabilities, such as full kernel / large kernel device capabilities. Large kernel device capabilities include not only the minimum kernel device capabilities but also additional device capabilities, such as supporting one or more of the following: wideband transmission and reception, a larger number of antennas, higher-order MCS, and higher data rates. Full kernel device capabilities encompass minimum kernel device capabilities; that is, minimum kernel device capabilities are a subset of full kernel device capabilities.

[0163] For example, the second capability set includes one or more of the following device capabilities: supporting a first bandwidth and a second bandwidth, supporting a first number of antennas and a second number of antennas, supporting a first MCS and a second MCS, and supporting a first data rate and a second data rate. The first capability set includes one or more of the following device capabilities: supporting a second bandwidth, supporting a second number of antennas, supporting a second MCS, and supporting a second data rate. The first capability set is a subset of the second capability set.

[0164] In some embodiments, the bandwidth corresponding to the second downlink signal is greater than the bandwidth corresponding to the first downlink signal. For example, the bandwidth occupied by the second downlink signal is greater than the bandwidth occupied by the first downlink signal. For example, the bandwidth of the PBCH included in the second downlink signal is greater than the bandwidth of the PBCH included in the first downlink signal.

[0165] In some embodiments, at least one second downlink signal is associated with at least one first downlink signal and / or at least one first uplink signal.

[0166] In some embodiments, the second time unit containing at least one second downlink signal is associated with the first time unit containing at least one first downlink signal and / or the first time unit containing at least one first uplink signal. The frequency domain resources corresponding to the second time unit are used for both uplink and downlink transmission, or the frequency domain resources corresponding to the second time unit are used only for downlink transmission. That is, the second time unit can be an SBFD time unit or a downlink time unit.

[0167] In some embodiments, at least one first downlink signal is transmitted on a first downlink resource, at least one first uplink signal is transmitted on a first uplink resource, and at least one second downlink signal is transmitted on a second downlink resource. The second downlink resource is associated with the first downlink resource and / or the first uplink resource.

[0168] In some embodiments, at least one first downlink signal and at least one first uplink signal are transmitted within a first cycle, and at least one second downlink signal is transmitted within a portion or all of the second downlink resources within the first cycle.

[0169] After the UE sends at least one first uplink signal, it listens for at least one second downlink signal.

[0170] For example, the UE listens to the second downlink signal in the second time unit associated with the first time unit, or the UE listens to the second downlink signal in the second downlink resource associated with the first uplink resource, or the UE listens to the second downlink signal in the second downlink resource associated with the first time unit.

[0171] For example, the UE continuously listens for the second downlink signal for T time units after the first time unit, where T is predefined by the communication protocol, configured by the network device, or pre-configured, or depends on the UE implementation.

[0172] For example, the UE listens to at least one second downlink signal on a portion of the second downlink resources associated with the first downlink resources, or the UE listens to at least one second downlink signal on all the second downlink resources associated with the first downlink resources, or the UE listens to at least one second downlink signal on a portion of the second downlink resources associated with the first uplink resources, or the UE listens to at least one second downlink signal on all the second downlink resources associated with the first uplink resources.

[0173] For example, the UE may listen to at least one second downlink signal using a portion of its second downlink resources during the first period, or the UE may listen to at least one second downlink signal using all of its second downlink resources during the first period.

[0174] In some embodiments, the UE receives at least one portion of the second downlink signal associated with a first downlink signal, or the UE receives all of the second downlink signals associated with at least one first downlink signal, or the UE receives at least one portion of the second downlink signal associated with a first uplink signal, or the UE receives all of the second downlink signals associated with at least one first uplink signal.

[0175] In some embodiments, the UE receives at least one second downlink signal through at least one beam, with each beam corresponding to one or more second downlink signals. Alternatively, the UE receives at least one second downlink signal through at least one spatial transmission filter, with each filter corresponding to one or more second downlink signals. Alternatively, the UE receives at least one second downlink signal through a single beam, with each beam corresponding to one or more second downlink signals. Alternatively, the UE receives at least one second downlink signal through a single spatial transmission filter, with each filter corresponding to one or more second downlink signals. Alternatively, the UE does not use a beam or a spatial transmission filter when receiving at least one second downlink signal.

[0176] Step 1360: The UE sends a second uplink signal.

[0177] The UE transmits a second uplink signal based on the received second downlink signal. If the UE receives multiple second downlink signals, it transmits a second uplink signal based on one of them. For example, the UE transmits a second uplink signal based on the second downlink signal with the best signal quality. Signal quality is represented by one or more of the following values: Received Signal Strength Indication (RSSI), Reference Signal Received Power (RSRP), Reference Signal Receiving Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), and Signal-to-Noise Ratio (SNR). For example, the UE receives multiple second uplink signals and performs subsequent transmissions based on the second uplink signal with the highest RSRP value.

[0178] In some embodiments, the second uplink resource associated with the second downlink signal is located in an SBFD time unit (such as a first time unit), and the UE abandons receiving the first downlink signal in the SBFD time unit and transmits the second uplink signal in the second uplink resource.

[0179] In some embodiments, the second uplink resource includes a RACH Occasion (RO), and the second uplink signal includes a preamble and / or Message 3 (Msg3).

[0180] In some embodiments, the second uplink resource includes a PUSCH Occasion (PO), and the second uplink signal is transmitted on the PUSCH. The second uplink signal is, for example, message A (MsgA), which includes a preamble and Msg3 or only Msg3.

[0181] In this embodiment of the application, the UE can be implemented as the terminal device 120 shown in FIG1.

[0182] In summary, the method provided in this application supports the UE to send at least one first uplink signal in the SBFD time unit and the network device to send at least one first downlink signal in the time unit. The network device can also receive at least one first uplink signal, improving intra-system communication efficiency. This eliminates the need for the network device to receive the first uplink signal through an additional time unit, saving power and reducing the interaction latency between uplink and downlink signals. Since the second downlink signal is sent based on the first uplink signal, it avoids the network device sending invalid or unnecessary second downlink signals, preventing waste of transmission resources during the access process, and eliminating the need to set a separate time unit for listening to the first uplink signal. Because the first downlink signal is simpler or has lower transmission overhead than the second downlink signal, designing the second downlink signal as an on-demand transmission mode can eliminate the transmission of some complex signals, thereby saving energy.

[0183] Figure 14 illustrates a schematic diagram of a signal transmission method provided by an exemplary embodiment of this application. It is assumed that each symbol in the system is an SBFD symbol, meaning that the frequency domain resources corresponding to each symbol include an uplink sub-band and a downlink sub-band. Optionally, a guard band exists between the uplink and downlink sub-bands. The structure of each SBFD symbol can be referenced in Figure 12. Figure 14 uses (d) of Figure 12 as an example for illustrative purposes; the following also applies to SBFD symbols with other structures.

[0184] The network device transmits multiple first downlink signals. The diagram illustrates this by showing the network device periodically transmitting multiple first downlink signals, but in reality, the transmission of first downlink signals can be non-periodic. Assuming one period consists of 5 time slots, the network device transmits four first downlink signals in each period using four different beams. For example, in one period, the network device transmits first downlink resources #1, #2, #3, and #4 in slots 0 and 1; in the next period, it transmits first downlink resources #5, #6, #7, and #8 in slots 5 and 6. A first downlink resource includes one or more SBFD symbols, which can also be understood as the first downlink resource corresponding to one or more SBFD symbols in the time domain.

[0185] Within the frequency domain resources corresponding to the SBFD symbol where the first downlink resource is located, there also exists a first uplink resource. The UE transmits at least one first uplink signal on at least one first uplink resource, and the first uplink signal is used to request or trigger the transmission of a second downlink signal. Optionally, the first uplink resource is periodic or aperiodic.

[0186] In some embodiments, the first downlink signal is a synchronization signal, and the second downlink signal is an SSB, which includes a synchronization signal and a PBCH. Optionally, the synchronization signal includes a PSS and / or an SSS.

[0187] In some embodiments, the first downlink signal is a first SSB, including a synchronization signal and a first PBCH. The second downlink signal is a second SSB, including a synchronization signal and a second PBCH. The bandwidth of the second PBCH is greater than the bandwidth of the first PBCH. Optionally, the synchronization signal includes a PSS and / or an SSS.

[0188] In some embodiments, the first downlink signal is a synchronization signal, which optionally includes PSS and / or SSS. The second downlink signal is system information.

[0189] In some embodiments, if the network device receives a first uplink signal within an SBFD symbol that transmits the first downlink signal, it transmits a second downlink signal in a second downlink resource. The second downlink resource is associated with the first uplink resource and / or the first downlink resource. The second downlink signal is associated with the first uplink signal and / or the first downlink signal. Furthermore, the transmission beam of the second downlink signal is the same as the transmission beam of its corresponding first downlink signal.

[0190] For example, if a network device transmits a first downlink signal in the first downlink resource #1 and receives a first uplink signal in the first uplink resource corresponding to the SBFD symbol where the first downlink resource #1 is located, then the network device transmits a second downlink signal in the second downlink resource #1, and the beam used to transmit the second downlink signal in the second downlink resource #1 is the same as the beam used to transmit the first downlink signal in the first downlink resource #1. Optionally, the first downlink resource #1 is associated with the second downlink resource #1, and / or, the first uplink resource corresponding to the SBFD symbol where the first downlink resource #1 is located is associated with the second downlink resource #1. Optionally, the first downlink signal transmitted on the first downlink resource #1 is associated with the second downlink signal transmitted on the second downlink resource #1. Optionally, the first uplink signal transmitted on the first uplink resource is associated with the second downlink signal transmitted on the second downlink resource #1.

[0191] For example, if a network device transmits a first downlink signal on the first downlink resource #3 and receives a first uplink signal in the first uplink resource corresponding to the SBFD symbol where the first downlink resource #3 is located, then the network device transmits a second downlink signal on the second downlink resource #3, and the beam used to transmit the second downlink signal on the second downlink resource #3 is the same as the beam used to transmit the first downlink signal on the first downlink resource #3. Optionally, the first downlink resource #3 is associated with the second downlink resource #3, and / or, the first uplink resource corresponding to the SBFD symbol where the first downlink resource #3 is located is associated with the second downlink resource #3. Optionally, the first downlink signal transmitted on the first downlink resource #3 is associated with the second downlink signal transmitted on the second downlink resource #3. Optionally, the first uplink signal transmitted on the first uplink resource is associated with the second downlink signal transmitted on the second downlink resource #3.

[0192] Furthermore, the UE transmits a first uplink signal once on any first uplink resource, and then listens for a second downlink signal. For example, if the UE transmits a first uplink signal on any first uplink resource corresponding to the SBFD symbol where first downlink resource #1 is located, and then listens for a second downlink signal, the UE will detect the second downlink signal on second downlink resource #1. Alternatively, the UE transmits a first uplink signal multiple times on multiple first uplink resources, and then listens for a second downlink signal. For example, if the UE transmits a first uplink signal on the first uplink resource corresponding to the SBFD symbol where first downlink resource #1 is located and on the first uplink resource corresponding to the SBFD symbol where first downlink resource #3 is located, the UE will receive the second downlink signal on both second downlink resource #1 and second downlink resource #3. If the UE receives multiple second downlink signals, it can perform subsequent transmissions based on the second downlink signal with the highest measured RSRP value (such as transmitting the second uplink signal described above).

[0193] In some embodiments, if a network device receives a first uplink signal within the SBFD symbol that transmits the first downlink signal, it uses all the second downlink resources in the current period to transmit the corresponding second downlink signal, and uses different beams to transmit different second downlink signals.

[0194] For example, if a network device sends a first downlink signal on the first downlink resource #1 to the first downlink resource #4, and receives the first uplink signal on any first uplink resource corresponding to the SBFD symbol where the first downlink resource #1 to the first downlink resource #4 is located, then the network device sends a second downlink signal on the second downlink resource #1 to the second downlink resource #4. The network device uses different beams to send the second downlink signal on the second downlink resource #1 to the second downlink resource #4 respectively.

[0195] Furthermore, the UE transmits a first uplink signal once on any first uplink resource, and then listens for the second downlink signal. Alternatively, the UE transmits the first uplink signal multiple times on multiple first uplink resources, and then listens for the second downlink signal. It should be noted that in this embodiment, regardless of how many times the UE transmits the first uplink signal, it will listen for all the second downlink signals within that period. For example, if the UE transmits the first uplink signal on the first uplink resource corresponding to the SBFD symbol where the first downlink resource #1 is located, the UE will receive the second downlink signal on all of the second downlink resources #1 to #4. If the UE receives multiple second downlink signals, it can perform subsequent transmission based on the second downlink signal with the highest measured RSRP value.

[0196] In some embodiments, if a network device receives a first uplink signal within an SBFD symbol that transmits a first downlink signal, it uses a portion of the second downlink resources in the current period to transmit one or more corresponding second downlink signals. If the network device transmits multiple second downlink signals, it uses different beams to transmit different second downlink signals.

[0197] For example, if a network device transmits a first downlink signal from first downlink resources #1 to #4, and any first uplink resource corresponding to the SBFD symbol of first downlink resources #1 to #4 receives the first uplink signal, then one of the second downlink resources #1 to #4 can transmit a second downlink signal, or two of the second downlink resources #1 to #4 can transmit a second downlink signal, or all three of the second downlink resources #1 to #4 can transmit a second downlink signal. Furthermore, the network device uses different beams when transmitting different second downlink signals from different second downlink resources.

[0198] Furthermore, the UE transmits a first uplink signal once on any first uplink resource, and then listens for the second downlink signal. Alternatively, the UE transmits the first uplink signal multiple times on multiple first uplink resources, and then listens for the second downlink signal. It should be noted that in this embodiment, regardless of how many times the UE transmits the first uplink signal, it will listen for all the second downlink signals within that period. For example, if the UE transmits the first uplink signal on the first uplink resource corresponding to the SBFD symbol where the first downlink resource #1 is located, and the UE listens for the second signal on second downlink resources #1 to #4, since the network device only transmits the second downlink signal on some of the second downlink resources, the UE will only receive the second downlink signal on the corresponding portion of the second downlink resources #1 to #4. If the UE receives multiple second downlink signals, it can perform subsequent transmission based on the second downlink signal with the highest measured RSRP value.

[0199] In some embodiments, after receiving the second downlink signal, the UE performs subsequent access procedures based on the second downlink signal.

[0200] For example, if the second downlink signal is associated with RO or PO, the UE sends a preamble and / or Msg3 at the RO associated with the received second downlink signal, or the UE sends MsgA (including the preamble and Msg3, or only Msg3) at the PO associated with the received second downlink signal.

[0201] For example, if the second downlink resource where the second downlink signal is located is associated with RO or PO, the UE sends a preamble and / or Msg3 when it receives the second downlink signal from the RO associated with the second downlink resource. Alternatively, the UE sends MsgA (including the preamble and Msg3, or only Msg3) when it receives the second downlink signal from the PO associated with the second downlink resource.

[0202] For example, after the UE detects a second downlink signal on the second downlink resource #3, or the UE detects multiple second downlink signals and determines that the RSRP value of the second downlink signal on the second downlink resource #3 is the strongest, the RO and / or PO associated with this second downlink signal are located in the SBFD symbols of the first downlink resources #5 to #8 in the next cycle. Therefore, the UE needs to determine whether to receive the first downlink signal or send the second uplink signal in the first downlink resources #5 to #8 in the next cycle. This application embodiment supports the UE abandoning the reception of the first downlink signal in the first downlink resources #5 to #8 in the next cycle, and instead sending the second uplink signal based on the second downlink signal of the previous cycle.

[0203] Figure 15 shows a structural block diagram of a signal transmission device provided in an exemplary embodiment of this application. This device can be implemented as a network device as described above, or as part of a network device as described above. The device includes a transmitting module 1510.

[0204] The transmitting module 1510 is used to transmit at least one first downlink signal and / or at least one second downlink signal, wherein the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink transmission and downlink transmission, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission.

[0205] In some embodiments, the apparatus further includes a receiving module 1550 for receiving at least one first uplink signal.

[0206] In some embodiments, the transmitting module 1510 is configured to transmit the at least one second downlink signal according to the at least one first uplink signal.

[0207] In some embodiments, the first uplink signal is used to request the transmission of the at least one second downlink signal, or the first uplink signal is used to trigger the transmission of the at least one second downlink signal.

[0208] In some embodiments, the transmitting module 1510 is configured to transmit the at least one first downlink signal; when the receiving module 1550 receives the at least one first uplink signal, the transmitting module 1510 is further configured to transmit the at least one second downlink signal.

[0209] In some embodiments, the receiving module 1550 is configured to receive the at least one first uplink signal within a first time unit in which the at least one first downlink signal is located, wherein the frequency domain resources corresponding to the first time unit are used for uplink transmission and downlink transmission.

[0210] In some embodiments, the second time unit in which the at least one second downlink signal is located is associated with the first time unit in which the at least one first downlink signal and / or the at least one first uplink signal is located; wherein the frequency domain resources corresponding to the second time unit are used for uplink and downlink transmission, or the frequency domain resources corresponding to the second time unit are used only for downlink transmission.

[0211] In some embodiments, the transmitting module 1510 is configured to: transmit a portion of the second downlink signal associated with the at least one first downlink signal, or transmit all of the second downlink signals associated with the at least one first downlink signal.

[0212] In some embodiments, the at least one first downlink signal and the at least one first uplink signal are transmitted within a first period, and the transmitting module 1510 is configured to transmit the at least one second downlink signal in part or all of the second downlink resources within the first period.

[0213] In some embodiments, the at least one first downlink signal is transmitted on a first downlink resource, the at least one first uplink signal is transmitted on a first uplink resource, and the at least one second downlink signal is transmitted on a second downlink resource, wherein the second downlink resource is associated with the first downlink resource and / or the first uplink resource.

[0214] In some embodiments, the at least one second downlink signal is associated with the at least one first downlink signal and / or the at least one first uplink signal.

[0215] In some embodiments, different second downlink signals correspond to different beams or different spatial transmission filters.

[0216] In some embodiments, the first downlink signal includes one or more of the following: a synchronization signal, a PSS, an SSS, and a broadcast channel; the second downlink signal includes one or more of the following: a synchronization signal, a PSS, an SSS, a broadcast channel, and system information.

[0217] In some embodiments, the first downlink signal corresponds to a first capability set, and the second downlink signal corresponds to a second capability set; wherein the first capability set is a subset of the second capability set, or the capabilities included in the first capability set are lower than the capabilities included in the second capability set.

[0218] In some embodiments, the bandwidth corresponding to the first downlink signal is less than the bandwidth corresponding to the second downlink signal.

[0219] In some embodiments, the receiving module 1550 is further configured to receive at least one second uplink signal.

[0220] In some embodiments, the second uplink signal includes a preamble and / or Msg3.

[0221] In some embodiments, the second uplink signal is transmitted on the PUSCH.

[0222] In some embodiments, the apparatus further includes a processing module 1530, configured to determine whether to send the second downlink signal and / or determine the transmission resources of the second downlink signal.

[0223] The designs of the first downlink signal, the first uplink signal, the second downlink signal, and the second uplink signal described in the previous embodiments are all applicable to the device shown in Figure 15, and will not be repeated here.

[0224] Figure 16 shows a structural block diagram of a signal transmission apparatus provided in an exemplary embodiment of this application. This apparatus can be implemented as the UE described above, or as part of the UE described above. The apparatus includes a receiving module 1610 and / or a transmitting module 1650.

[0225] The receiving module 1610 is configured to receive at least one second downlink signal, the at least one second downlink signal being transmitted according to the at least one first uplink signal.

[0226] The transmitting module 1650 is used to transmit at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission.

[0227] In some embodiments, the first uplink signal is used to request the transmission of the at least one second downlink signal, or the first uplink signal is used to trigger the transmission of the at least one second downlink signal.

[0228] In some embodiments, the second time unit in which the at least one second downlink signal is located is associated with the first time unit in which the at least one first uplink signal is located; wherein the frequency domain resources corresponding to the first time unit are used for uplink and downlink transmission; the frequency domain resources corresponding to the second time unit are used for uplink and downlink transmission, or the frequency domain resources corresponding to the second time unit are used only for downlink transmission.

[0229] In some embodiments, the first time unit in which the at least one first uplink signal is located is further used for the network device to send at least one first downlink signal.

[0230] In some embodiments, the at least one second downlink signal is part or all of the second downlink signals associated with the at least one first downlink signal.

[0231] In some embodiments, the at least one first downlink signal and the at least one first uplink signal are transmitted within a first period; the at least one second downlink signal is transmitted within a portion or all of the second downlink resources within the first period.

[0232] In some embodiments, the at least one first downlink signal is transmitted on a first downlink resource, and the at least one second downlink signal is transmitted on a second downlink resource, the second downlink resource being associated with the first downlink resource.

[0233] In some embodiments, the at least one second downlink signal is associated with the at least one first downlink signal.

[0234] In some embodiments, the first downlink signal corresponds to a first capability set, and the second downlink signal corresponds to a second capability set; wherein the first capability set is a subset of the second capability set, or the capabilities included in the first capability set are lower than the capabilities included in the second capability set.

[0235] In some embodiments, the bandwidth corresponding to the first downlink signal is less than the bandwidth corresponding to the second downlink signal.

[0236] In some embodiments, the first downlink signal includes one or more of the following: a synchronization signal, a PSS, an SSS, and a broadcast channel. The second downlink signal includes one or more of the following: a synchronization signal, a PSS, an SSS, a broadcast channel, and system information.

[0237] In some embodiments, the at least one first uplink signal is transmitted on a first uplink resource, and the at least one second downlink signal is transmitted on a second downlink resource, the second downlink resource being associated with the first uplink resource.

[0238] In some embodiments, the at least one second downlink signal is associated with the at least one first uplink signal.

[0239] In some embodiments, different second downlink signals correspond to different beams or different spatial transmission filters.

[0240] In some embodiments, the apparatus further includes a processing module 1630, configured to determine whether to monitor the second downlink signal, and / or determine the transmission resources of the second downlink signal, and / or determine whether to send the second uplink signal.

[0241] In some embodiments, the transmitting module 1650 is further configured to transmit at least one second uplink signal.

[0242] In some embodiments, the second uplink signal includes a preamble and / or Msg3.

[0243] In some embodiments, the second uplink signal is transmitted on the PUSCH.

[0244] The designs of the first downlink signal, the first uplink signal, the second downlink signal, and the second uplink signal described in the previous embodiments are all applicable to the device shown in Figure 16, and will not be repeated here.

[0245] It should be noted that the apparatus provided in the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the communication device can be divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept.

[0246] Figure 17 shows a schematic diagram of the structure of a communication device provided in an exemplary embodiment of this application. The communication device 1700 includes at least one of the following: a receiver 1701, a transmitter 1702, a processor 1703, a memory 1704, and a bus (not shown in the figure).

[0247] Receiver 1701 is used to implement the receiving function, and transmitter 1702 is used to implement the transmitting function. Optionally, receiver 1701 and transmitter 1702 can be implemented as a communication component, which can be a communication chip, and can be called a transceiver. Optionally, receiver 1701 and transmitter 1702 can be implemented as a wireless communication component and / or a wired communication component. Optionally, the wireless communication component includes a wireless communication chip and / or a radio frequency antenna. Optionally, the wired communication component includes a wired communication chip and / or a wired interface.

[0248] The processor 1703 includes one or more processing cores, and the processor 1703 executes various functional applications and information processing by running software programs and modules.

[0249] In some embodiments, the communication device 1700 is implemented as a network device for performing some or all of the steps performed by the network device. The receiver 1701 can be used to implement the functions and steps of the receiving module 1550, the transmitter 1702 can be used to implement the functions and steps of the sending module 1510, and the processor 1703 can be used to implement the functions and steps of the processing module 1530.

[0250] In some embodiments, the communication device 1700 is implemented as a UE, used to perform some or all of the steps performed by the UE. The receiver 1701 can be used to implement the functions and steps of the receiving module 1610, the transmitter 1702 can be used to implement the functions and steps of the sending module 1650, and the processor 1703 can be used to implement the functions and steps of the processing module 1630.

[0251] The memory 1704 can be used to store a computer program executed by the processor 1703, which executes the computer program to implement the various steps in the above method embodiments.

[0252] Furthermore, the memory 1704 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), read-only memory (ROM), magnetic storage, flash memory, and programmable read-only memory (PROM).

[0253] In some embodiments, the memory 1704 may be connected to the processor 1703, the receiver 1701, and the transmitter 1702.

[0254] In some embodiments, receiver 1701 independently receives signals / data, or processor 1703 controls receiver 1701 to receive signals / data, or processor 1703 requests receiver 1701 to receive signals / data, or processor 1703 cooperates with receiver 1701 to receive signals / data.

[0255] In some embodiments, the transmitter 1702 independently transmits signals / data, or the processor 1703 controls the transmitter 1702 to transmit signals / data, or the processor 1703 requests the transmitter 1702 to transmit signals / data, or the processor 1703 cooperates with the transmitter 1702 to transmit signals / data.

[0256] For details not described in this embodiment, please refer to the embodiments above, which will not be repeated here.

[0257] In one exemplary embodiment of this application, a chip is also provided, the chip including programmable logic circuits and / or program instructions, which, when the chip is run on a communication device, is used to implement the signal transmission methods provided in the above-described method embodiments.

[0258] In some embodiments, this application provides a chip including programmable logic circuitry and / or program instructions to cause a network device equipped with the chip to transmit at least one first downlink signal and / or at least one second downlink signal, wherein the at least one second downlink signal is transmitted based on at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink and downlink transmission, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission.

[0259] Furthermore, the chip can be used to implement the functions and steps of at least one of the above-described transmitting module 1510, processing module 1530, and receiving module 1550. The related designs of the first downlink signal, first uplink signal, second downlink signal, and second uplink signal described in the preceding embodiments are also applicable to the chip.

[0260] In some embodiments, this application provides a chip, the chip including programmable logic circuitry and / or program instructions, such that a UE equipped with the chip transmits at least one first uplink signal and / or receives at least one second downlink signal; wherein, the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

[0261] Furthermore, the chip can be used to implement the functions and steps of at least one of the receiving module 1610, processing module 1630, and transmitting module 1650 described above. The related designs of the first downlink signal, first uplink signal, second downlink signal, and second uplink signal described in the preceding embodiments are also applicable to the chip.

[0262] In one exemplary embodiment of this application, a computer-readable storage medium is also provided, which stores at least one program, which is loaded and executed by a processor to implement the signal transmission method provided in the above-described method embodiments.

[0263] In some embodiments, this application provides a computer-readable storage medium storing a computer program loaded and executed by a network device, such that the network device transmits at least one first downlink signal and / or at least one second downlink signal, wherein the at least one second downlink signal is transmitted based on at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink and downlink transmission, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission.

[0264] Furthermore, the computer-readable storage medium can be used to implement the functions and steps of at least one of the transmitting module 1510, processing module 1530, and receiving module 1550 described above. The related designs of the first downlink signal, first uplink signal, second downlink signal, and second uplink signal described in the preceding embodiments are also applicable to the computer-readable storage medium.

[0265] In some embodiments, this application provides a computer-readable storage medium storing a computer program, which is loaded and executed by a UE to enable the UE to transmit at least one first uplink signal and / or receive at least one second downlink signal; wherein the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

[0266] Furthermore, the computer-readable storage medium can be used to implement the functions and steps of at least one of the receiving module 1610, processing module 1630, and transmitting module 1650 described above. The related designs of the first downlink signal, first uplink signal, second downlink signal, and second uplink signal described in the preceding embodiments are also applicable to the computer-readable storage medium.

[0267] In one exemplary embodiment of this application, a computer program product is also provided. The computer program product includes computer instructions stored in a computer-readable storage medium. A processor retrieves the computer instructions from the computer-readable storage medium and executes the computer instructions to implement the signal transmission method provided in the above-described method embodiments.

[0268] In some embodiments, this application provides a computer program product comprising computer instructions stored in a computer-readable storage medium. A processor of a network device retrieves the computer instructions from the computer-readable storage medium and executes the computer instructions to transmit at least one first downlink signal and / or at least one second downlink signal. The at least one second downlink signal is transmitted based on at least one first uplink signal. Frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink and downlink transmission.

[0269] Furthermore, the computer program product can be used to implement the functions and steps of at least one of the above-described transmitting module 1510, processing module 1530, and receiving module 1550. The related designs of the first downlink signal, first uplink signal, second downlink signal, and second uplink signal described in the preceding embodiments are also applicable to the computer program product.

[0270] In some embodiments, this application provides a computer program product comprising computer instructions stored in a computer-readable storage medium. A processor of a UE obtains the computer instructions from the computer-readable storage medium and executes the computer instructions to transmit at least one first uplink signal and / or receive at least one second downlink signal. The frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

[0271] Furthermore, the computer program product can be used to implement the functions and steps of at least one of the receiving module 1610, processing module 1630, and transmitting module 1650 described above. The related designs of the first downlink signal, first uplink signal, second downlink signal, and second uplink signal described in the preceding embodiments are also applicable to the computer program product.

[0272] In one exemplary embodiment of this application, a computer program is also provided. The computer program includes computer instructions stored in a computer-readable storage medium. A processor retrieves the computer instructions from the computer-readable storage medium and executes the computer instructions to implement the signal transmission method provided in the above-described method embodiments.

[0273] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0274] The above are merely optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A signal transmission method, characterized in that, The method is performed by a network device, and the method includes: At least one first downlink signal and / or at least one second downlink signal are transmitted, wherein the at least one second downlink signal is transmitted based on at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink and downlink transmission, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission.

2. The method according to claim 1, characterized in that, The first uplink signal is used to request the transmission of the at least one second downlink signal, or the first uplink signal is used to trigger the transmission of the at least one second downlink signal.

3. The method according to claim 1 or 2, characterized in that, The transmission of at least one first downlink signal and / or at least one second downlink signal includes: Send the at least one first downlink signal; Upon receiving the at least one first uplink signal, the at least one second downlink signal is transmitted.

4. The method according to claim 3, characterized in that, The method further includes: Within a first time unit in which the at least one first downlink signal is located, the at least one first uplink signal is received, and the frequency domain resources corresponding to the first time unit are used for uplink and downlink transmission.

5. The method according to any one of claims 1 to 4, characterized in that, The second time unit in which the at least one second downlink signal is located is associated with the first time unit in which the at least one first downlink signal and / or the at least one first uplink signal is located. The frequency domain resources corresponding to the second time unit are used for both uplink and downlink transmission, or the frequency domain resources corresponding to the second time unit are used only for downlink transmission.

6. The method according to any one of claims 1 to 5, characterized in that, The transmission of at least one second downlink signal includes: Send a portion of the second downlink signal associated with the at least one first downlink signal, or send all of the second downlink signals associated with the at least one first downlink signal.

7. The method according to any one of claims 1 to 6, characterized in that, The at least one first downlink signal and the at least one first uplink signal are transmitted within the first cycle; The transmission of at least one second downlink signal includes: The at least one second downlink signal is transmitted using some or all of the second downlink resources during the first period.

8. The method according to any one of claims 1 to 7, characterized in that, The at least one first downlink signal is transmitted on the first downlink resource, the at least one first uplink signal is transmitted on the first uplink resource, and the at least one second downlink signal is transmitted on the second downlink resource, wherein the second downlink resource is associated with the first downlink resource and / or the first uplink resource.

9. The method according to any one of claims 1 to 8, characterized in that, The at least one second downlink signal is associated with the at least one first downlink signal and / or the at least one first uplink signal.

10. The method according to any one of claims 1 to 9, characterized in that, Different second downlink signals correspond to different beams or different spatial transmission filters.

11. The method according to any one of claims 1 to 10, characterized in that, The first downlink signal includes one or more of the following: a synchronization signal, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel; The second downlink signal includes one or more of the following: synchronization signal, PSS, SSS, broadcast channel, system information.

12. The method according to any one of claims 1 to 11, characterized in that, The first downlink signal corresponds to a first capability set, and the second downlink signal corresponds to a second capability set; wherein the first capability set is a subset of the second capability set, or the capabilities included in the first capability set are lower than the capabilities included in the second capability set.

13. The method according to any one of claims 1 to 12, characterized in that, The bandwidth corresponding to the first downlink signal is less than the bandwidth corresponding to the second downlink signal.

14. A signal transmission method, characterized in that, The method is executed by a terminal device, and the method includes: Send at least one first uplink signal, and / or receive at least one second downlink signal; The frequency domain resources corresponding to the time unit where the at least one first uplink signal is located are used for uplink and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

15. The method according to claim 14, characterized in that, The first uplink signal is used to request the transmission of the at least one second downlink signal, or the first uplink signal is used to trigger the transmission of the at least one second downlink signal.

16. The method according to claim 14 or 15, characterized in that, The second time unit in which the at least one second downlink signal is located is associated with the first time unit in which the at least one first uplink signal is located; The frequency domain resources corresponding to the first time unit are used for uplink and downlink transmission; the frequency domain resources corresponding to the second time unit are used for uplink and downlink transmission, or the frequency domain resources corresponding to the second time unit are used only for downlink transmission.

17. The method according to any one of claims 14 to 16, characterized in that, The first time unit in which the at least one first uplink signal is located is also used for the network device to send at least one first downlink signal.

18. The method according to claim 17, characterized in that, The at least one second downlink signal is part or all of the second downlink signals associated with the at least one first downlink signal.

19. The method according to claim 17 or 18, characterized in that, The at least one first downlink signal and the at least one first uplink signal are transmitted within a first period; the at least one second downlink signal is transmitted within a portion or all of the second downlink resources within the first period.

20. The method according to any one of claims 17 to 19, characterized in that, The at least one first downlink signal is transmitted on the first downlink resource, and the at least one second downlink signal is transmitted on the second downlink resource, the second downlink resource being associated with the first downlink resource.

21. The method according to any one of claims 17 to 20, characterized in that, The at least one second downlink signal is associated with the at least one first downlink signal.

22. The method according to any one of claims 17 to 21, characterized in that, The first downlink signal corresponds to a first capability set, and the second downlink signal corresponds to a second capability set; wherein the first capability set is a subset of the second capability set, or the capabilities included in the first capability set are lower than the capabilities included in the second capability set.

23. The method according to any one of claims 17 to 22, characterized in that, The bandwidth corresponding to the first downlink signal is less than the bandwidth corresponding to the second downlink signal.

24. The method according to any one of claims 17 to 23, characterized in that, The first downlink signal includes one or more of the following: a synchronization signal, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel.

25. The method according to any one of claims 14 to 24, characterized in that, The at least one first uplink signal is transmitted on the first uplink resource, and the at least one second downlink signal is transmitted on the second downlink resource, the second downlink resource being associated with the first uplink resource.

26. The method according to any one of claims 14 to 25, characterized in that, The at least one second downlink signal is associated with the at least one first uplink signal.

27. The method according to any one of claims 14 to 26, characterized in that, Different second downlink signals correspond to different beams or different spatial transmission filters.

28. The method according to any one of claims 14 to 27, characterized in that, The second downlink signal includes one or more of the following: synchronization signal, PSS, SSS, broadcast channel, system information.

29. A signal transmission device, characterized in that, The device includes: A transmitting module is configured to transmit at least one first downlink signal and / or at least one second downlink signal, wherein the at least one second downlink signal is transmitted based on at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink transmission and downlink transmission, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink transmission and downlink transmission.

30. The apparatus according to claim 29, characterized in that, The first uplink signal is used to request the transmission of the at least one second downlink signal, or the first uplink signal is used to trigger the transmission of the at least one second downlink signal.

31. The apparatus according to claim 29 or 30, characterized in that, The device further includes a receiving module, and when the receiving module receives the at least one first uplink signal, the transmitting module is used to transmit the at least one second downlink signal.

32. The apparatus according to claim 31, characterized in that, The receiving module is further configured to: receive the at least one first uplink signal within a first time unit in which the at least one first downlink signal is located, wherein the frequency domain resources corresponding to the first time unit are used for uplink transmission and downlink transmission.

33. The apparatus according to any one of claims 29 to 32, characterized in that, The second time unit in which the at least one second downlink signal is located is associated with the first time unit in which the at least one first downlink signal and / or the at least one first uplink signal is located. The frequency domain resources corresponding to the second time unit are used for both uplink and downlink transmission, or the frequency domain resources corresponding to the second time unit are used only for downlink transmission.

34. The apparatus according to any one of claims 29 to 33, characterized in that, The transmitting module is configured to: transmit a portion of the second downlink signal associated with the at least one first downlink signal, or transmit all of the second downlink signals associated with the at least one first downlink signal.

35. The apparatus according to any one of claims 29 to 34, characterized in that, The at least one first downlink signal and the at least one first uplink signal are transmitted within a first period, and the transmitting module is configured to transmit the at least one second downlink signal in part or all of the second downlink resources within the first period.

36. The apparatus according to any one of claims 29 to 35, characterized in that, The at least one first downlink signal is transmitted on the first downlink resource, the at least one first uplink signal is transmitted on the first uplink resource, and the at least one second downlink signal is transmitted on the second downlink resource, wherein the second downlink resource is associated with the first downlink resource and / or the first uplink resource.

37. The apparatus according to any one of claims 29 to 36, characterized in that, The at least one second downlink signal is associated with the at least one first downlink signal and / or the at least one first uplink signal.

38. The apparatus according to any one of claims 29 to 37, characterized in that, Different second downlink signals correspond to different beams or different spatial transmission filters.

39. The apparatus according to any one of claims 29 to 38, characterized in that, The first downlink signal includes one or more of the following: a synchronization signal, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel; The second downlink signal includes one or more of the following: synchronization signal, PSS, SSS, broadcast channel, system information.

40. The apparatus according to any one of claims 29 to 39, characterized in that, The first downlink signal corresponds to a first capability set, and the second downlink signal corresponds to a second capability set; wherein the first capability set is a subset of the second capability set, or the capabilities included in the first capability set are lower than the capabilities included in the second capability set.

41. The apparatus according to any one of claims 29 to 40, characterized in that, The bandwidth corresponding to the first downlink signal is less than the bandwidth corresponding to the second downlink signal.

42. A signal transmission device, characterized in that, The device includes: a transmitting module and / or a receiving module, wherein the transmitting module is configured to transmit at least one first uplink signal, and the receiving module is configured to receive at least one second downlink signal; The frequency domain resources corresponding to the time unit where the at least one first uplink signal is located are used for uplink and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

43. The apparatus according to claim 42, characterized in that, The first uplink signal is used to request the transmission of the at least one second downlink signal, or the first uplink signal is used to trigger the transmission of the at least one second downlink signal.

44. The apparatus according to claim 42 or 43, characterized in that, The second time unit in which the at least one second downlink signal is located is associated with the first time unit in which the at least one first uplink signal is located; wherein, the frequency domain resources corresponding to the first time unit are used for uplink transmission and downlink transmission; the frequency domain resources corresponding to the second time unit are used for uplink transmission and downlink transmission, or, the frequency domain resources corresponding to the second time unit are used only for downlink transmission.

45. The apparatus according to any one of claims 42 to 44, characterized in that, The first time unit in which the at least one first uplink signal is located is also used for the network device to send at least one first downlink signal.

46. ​​The apparatus according to claim 45, characterized in that, The at least one second downlink signal is part or all of the second downlink signals associated with the at least one first downlink signal.

47. The apparatus according to claim 45 or 46, characterized in that, The at least one first downlink signal and the at least one first uplink signal are transmitted within a first period; the at least one second downlink signal is transmitted within a portion or all of the second downlink resources within the first period.

48. The apparatus according to any one of claims 45 to 47, characterized in that, The at least one first downlink signal is transmitted on the first downlink resource, and the at least one second downlink signal is transmitted on the second downlink resource, the second downlink resource being associated with the first downlink resource.

49. The apparatus according to any one of claims 45 to 48, characterized in that, The at least one second downlink signal is associated with the at least one first downlink signal.

50. The apparatus according to any one of claims 45 to 49, characterized in that, The first downlink signal corresponds to a first capability set, and the second downlink signal corresponds to a second capability set; wherein the first capability set is a subset of the second capability set, or the capabilities included in the first capability set are lower than the capabilities included in the second capability set.

51. The apparatus according to any one of claims 45 to 50, characterized in that, The bandwidth corresponding to the first downlink signal is less than the bandwidth corresponding to the second downlink signal.

52. The apparatus according to any one of claims 45 to 51, characterized in that, The first downlink signal includes one or more of the following: a synchronization signal, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel.

53. The apparatus according to any one of claims 42 to 52, characterized in that, The at least one first uplink signal is transmitted on the first uplink resource, and the at least one second downlink signal is transmitted on the second downlink resource, the second downlink resource being associated with the first uplink resource.

54. The apparatus according to any one of claims 42 to 53, characterized in that, The at least one second downlink signal is associated with the at least one first uplink signal.

55. The apparatus according to any one of claims 42 to 54, characterized in that, Different second downlink signals correspond to different beams or different spatial transmission filters.

56. The apparatus according to any one of claims 42 to 55, characterized in that, The second downlink signal includes one or more of the following: synchronization signal, PSS, SSS, broadcast channel, system information.

57. A network device, characterized in that, The network device includes: a processor; a transmitter connected to the processor; and a memory for storing executable instructions of the processor; wherein the transmitter is configured to transmit at least one first downlink signal and / or at least one second downlink signal, the at least one second downlink signal being transmitted based on at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located being used for uplink and downlink transmission, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located being used for uplink and downlink transmission.

58. A terminal device, characterized in that, The terminal device includes: a processor; a receiver and / or a transmitter connected to the processor; and a memory for storing executable instructions of the processor; wherein the receiver is configured to receive at least one second downlink signal, the transmitter is configured to transmit at least one first uplink signal, the frequency domain resources corresponding to the time unit of the at least one first uplink signal are used for uplink and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

59. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one program, which is loaded and executed by a processor to transmit at least one first downlink signal and / or at least one second downlink signal, wherein the at least one second downlink signal is transmitted according to at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink and downlink transmission, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission.

60. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one program, which is loaded and executed by a processor to transmit at least one first uplink signal and / or receive at least one second downlink signal; wherein the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

61. A computer program product, characterized in that, The computer program product includes computer instructions stored in a computer-readable storage medium. A processor retrieves the computer instructions from the computer-readable storage medium and executes the computer instructions to transmit at least one first downlink signal and / or at least one second downlink signal. The at least one second downlink signal is transmitted based on at least one first uplink signal. The frequency domain resources corresponding to the time unit where the at least one first downlink signal is located are used for uplink and downlink transmission.

62. A computer program product, characterized in that, The computer program product includes computer instructions stored in a computer-readable storage medium. A processor retrieves the computer instructions from the computer-readable storage medium and executes the computer instructions to transmit at least one first uplink signal and / or receive at least one second downlink signal. The frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

63. A chip, characterized in that, The chip includes programmable logic circuitry and / or at least a program to enable a network device equipped with the chip to transmit at least one first downlink signal and / or at least one second downlink signal, wherein the at least one second downlink signal is transmitted based on at least one first uplink signal, and the frequency domain resources corresponding to the time unit in which the at least one first downlink signal is located are used for uplink and downlink transmission, and the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission.

64. A chip, characterized in that, The chip includes programmable logic circuitry and / or at least a program to enable a terminal device equipped with the chip to transmit at least one first uplink signal and / or receive at least one second downlink signal; wherein, the frequency domain resources corresponding to the time unit in which the at least one first uplink signal is located are used for uplink and downlink transmission, and the at least one second downlink signal is transmitted according to the at least one first uplink signal.

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