Interference avoidance method and apparatus based on time division duplex (TDD) multi-type frame structure

Abstract

The present application relates to the technical field of communications, and provides an interference avoidance method and apparatus based on a time division duplex (TDD) multi-type frame structure. The method comprises: transmitting first common signaling on the basis of a first TDD frame structure, and transmitting second common signaling on the basis of a second TDD frame structure; and receiving a first uplink signal transmitted from a terminal using the first TDD frame structure, and receiving a second uplink signal transmitted from a terminal using the second TDD frame structure. The first common signaling and the second uplink signal are transmitted by means of different frequency domain resources, and the second common signaling and the first uplink signal are transmitted by means of different frequency domain resources; and the second TDD frame structure and the first TDD frame structure have the same frame period and the same uplink and downlink slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure. The present application avoids co-channel cross-link interference that may exist between a "terminal that is performing uplink signal transmission" in a cell and a "terminal that is receiving necessary downlink common signaling" in the cell.

Description

An interference avoidance method and apparatus based on time-division duplex (TDD) multi-frame structure

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 202510469337.5, filed on April 15, 2025, entitled "An Interference Avoidance Method and Apparatus Based on Time Division Duplex (TDD) Multi-Frame Structure", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of communication technology, and in particular to an interference avoidance method and apparatus based on a time division duplex (TDD) multi-frame structure. Background Technology

[0004] With the increasing importance of Low Earth Orbit (LEO) satellite systems in global communication networks, the design of satellite-to-ground user links often adopts the Frequency Division Duplex (FDD) standard. However, due to the scarcity of available spectrum resources, low spectrum utilization when implementing asymmetric uplink and downlink services, and the inability to share radio frequency units for both transmission and reception, the industry has gradually begun to focus on the application of the Time Division Duplex (TDD) standard.

[0005] When TDD (Transmission over Memory) technology is applied to satellite communication, a long guard period (GP) must be reserved between the downlink (DL) and uplink (UL) time slots in each frame period, resulting in a very low availability of air interface resources for the entire system. To improve the "network-side resource availability" of TDD, related technologies divide the user equipment (UE) within a cell into two groups. One group of UEs uses the basic TDD frame structure, while the other group uses a frame header-offset version of the TDD frame structure. The two frame structures are identical in frame period and uplink / downlink time slot ratio; the difference lies in the frame header offset. The effect of the frame header offset technique is to make all (or part) of the DL and UL time slots in the frame header-offset frame structure correspond to the GP time slots of the basic frame structure (i.e., they occur at the same time). Simultaneously, this naturally ensures that all (or part) of the DL and UL time slots in the basic frame structure correspond to the GP time slots of the frame header-offset frame structure. Therefore, the satellite-based base station can provide communication services to UEs using the frame header offset frame structure during the time slot corresponding to the GP time slot of the basic frame structure, and can provide communication services to UEs using the basic frame structure during the time slot corresponding to the GP time slot of the frame header offset frame structure. Through this design, the "network-side resource availability" will be significantly improved, thereby enhancing the application potential of the TDD standard in satellite-to-ground links.

[0006] However, although the aforementioned multi-frame structure technology using two frame structures significantly improves the "network-side resource availability" of TDD satellite communication systems, due to the large propagation distance of the satellite-to-ground link in low-Earth orbit satellite systems, users need to use a large value of Timing Advance (TA) when transmitting uplink on the satellite-to-ground link, and there will be a large order of magnitude of transmission delay when receiving downlink. Therefore, when one group of UEs communicates using the basic TDD frame structure and another group of UEs communicates using the frame header offset version of the TDD frame structure, the following situation may occur between the two UEs belonging to different groups: one UE is receiving downlink while the other UE is transmitting uplink. When the distance between the two UEs is close, it may cause "inter-UE co-channel cross-link interference". Summary of the Invention

[0007] This application aims to at least partially address one of the technical problems in the related art.

[0008] Therefore, one objective of this application is to propose an interference avoidance method based on TDD multi-frame structure, applicable to network devices, including:

[0009] First common signaling is transmitted based on the first TDD frame structure, and second common signaling is transmitted based on the second TDD frame structure;

[0010] Receive a first uplink signal transmitted from a terminal using a first TDD frame structure, and receive a second uplink signal transmitted from a terminal using a second TDD frame structure;

[0011] Among them, the first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources.

[0012] The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

[0013] The second objective of this application is to propose an interference avoidance method based on a TDD multi-frame structure, applied to a terminal, including:

[0014] When the terminal uses the first TDD frame structure, it sends a first uplink signal to the network device and receives the first common signaling sent by the network device based on the first TDD frame structure.

[0015] When the terminal uses the second TDD frame structure, it sends a second uplink signal to the network device and receives the second common signaling sent by the network device based on the second TDD frame structure.

[0016] Among them, the first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources.

[0017] The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

[0018] The third objective of this application is to propose an interference avoidance device based on a TDD multi-frame structure, applicable to network equipment, including:

[0019] The transmitting module is configured to transmit a first common signaling based on a first TDD frame structure, and to transmit a second common signaling based on a second TDD frame structure;

[0020] The receiving module is configured to receive a first uplink signal transmitted from a terminal using a first TDD frame structure, and to receive a second uplink signal transmitted from a terminal using a second TDD frame structure.

[0021] Among them, the first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources.

[0022] The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

[0023] The fourth objective of this application is to propose an interference avoidance device based on a TDD multi-frame structure, applied to a terminal, comprising:

[0024] The sending module is configured to: send a first uplink signal to the network device based on the first TDD frame structure when the terminal uses the first TDD frame structure, or send a second uplink signal to the network device based on the second TDD frame structure when the terminal uses the second TDD frame structure.

[0025] The receiving module is configured to: receive a first common signaling sent by a network device based on the first TDD frame structure when the terminal uses the first TDD frame structure, or receive a second common signaling sent by a network device based on the second TDD frame structure when the terminal uses the second TDD frame structure;

[0026] Among them, the first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources.

[0027] The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

[0028] The fifth objective of this application is to provide a network device comprising:

[0029] At least one processor; and,

[0030] A memory communicatively connected to the at least one processor; wherein,

[0031] The memory stores instructions that can be executed by the at least one processor, which enables the at least one processor to execute the interference avoidance method based on TDD multi-frame structure on the network device side.

[0032] The sixth objective of this application is to provide a terminal comprising:

[0033] At least one processor; and,

[0034] A memory communicatively connected to the at least one processor; wherein,

[0035] The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the aforementioned interference avoidance method based on TDD multi-frame structure on the terminal side.

[0036] The seventh objective of this application is to provide a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause the computer to execute the interference avoidance method based on TDD multi-frame structure on the network device side or to execute the interference avoidance method based on TDD multi-frame structure on the terminal side.

[0037] This application achieves at least the following beneficial effects: In this application, the first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources. In this way, the frequency domain resources used by the common signaling transmitted in one frame structure and the frequency domain resources used by the uplink signal transmitted in another TDD frame structure can be isolated in the frequency domain, thereby avoiding the co-channel cross-link interference that may exist between the "terminal that is transmitting uplink signals" and the "terminal that is receiving necessary downlink common signaling" in the cell. Attached Figure Description

[0038] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0039] Figure 1 is a schematic diagram illustrating a frame structure design method according to an embodiment of this application.

[0040] Figure 2 is a schematic diagram illustrating cross-link interference between terminals in a co-channel configuration according to an embodiment of this application.

[0041] Figure 3 is a schematic diagram illustrating an exemplary implementation of an interference avoidance method based on a TDD multi-frame structure according to an embodiment of this application.

[0042] Figure 4 is a schematic diagram of a first adaptability design scheme shown in an embodiment of this application.

[0043] Figure 5 is a schematic diagram illustrating an edge wave position and a non-edge wave position according to an embodiment of this application.

[0044] Figure 6 is a schematic diagram illustrating the time slots occupied by a first uplink signal and a second common signaling according to an embodiment of this application.

[0045] Figure 7 is a schematic diagram illustrating the time slots occupied by a second uplink signal and a first common signaling according to an embodiment of this application.

[0046] Figure 8 is a schematic diagram illustrating the time slots occupied by a second uplink signal and a first common signaling according to an embodiment of this application.

[0047] Figure 9 is a schematic diagram of a second adaptability design scheme shown in one embodiment of this application.

[0048] Figure 10 is a schematic diagram of the time slots occupied by a first uplink signal and a second common signaling, as shown in this application.

[0049] Figure 11 is a schematic diagram of the third adaptability design scheme shown in this application.

[0050] Figure 12 is a schematic diagram of a third adaptive design scheme shown in this application.

[0051] Figure 13 is a schematic diagram illustrating an example of cross-link interference between UEs in the common channel.

[0052] Figure 14 is a schematic diagram of an interference avoidance method based on TDD multi-frame structure shown in this application.

[0053] Figure 15 is a schematic diagram of an interference avoidance device based on a TDD multi-frame structure shown in this application.

[0054] Figure 16 is a schematic diagram of an interference avoidance device based on a TDD multi-frame structure shown in this application.

[0055] Figure 17 is a schematic diagram of a network device according to an embodiment of this application.

[0056] Figure 18 is a schematic diagram of a terminal according to an embodiment of this application. Detailed Implementation

[0057] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0058] To improve air interface resource availability, one feasible approach is to divide the terminals within a cell into two groups. One group is scheduled to use the basic TDD frame structure, while the other group is scheduled to use a header-offset TDD frame structure. Both frame structures are identical in frame period and uplink / downlink time slot configuration; the only difference lies in the header offset. This allows network devices to communicate with the other group of terminals during periods of communication delays, significantly improving the overall air interface resource availability of the system.

[0059] For ease of description, in this application, the basic TDD frame structure is referred to as the first TDD frame structure, and the frame header offset version TDD frame structure is referred to as the second TDD frame structure.

[0060] The following introduces three feasible frame structure design methods.

[0061] The first feasible frame structure design is illustrated in Figure 1, which is a schematic diagram of one such design. As shown in Figure 1, the first TDD frame structure is the basic frame structure. The number of guard period (GP) slots in the first TDD frame structure is N (N is a positive integer). The sum of the number of downlink (DL) slots and uplink (UL) slots in the first TDD frame structure is equal to N. The frame header of the first TDD frame structure is offset by N slots to obtain the second TDD frame structure. In Figure 1 and other figures in this application, "D" represents the downlink DL slot, "U" represents the uplink UL slot, and "S" represents the guard period (GP) slot. As shown in Figure 1, the DL and UL slots of the second TDD frame structure correspond one-to-one with the GP slots of the first TDD frame structure. In this first frame structure design implementation, network devices can always communicate with certain terminals without any "waiting" periods.

[0062] The second feasible frame structure design method is as follows: the first TDD frame structure is the base frame structure, the number of GP slots in the first TDD frame structure is N (N is a positive integer), the sum of the number of DL slots and UL slots in the first TDD frame structure is less than N, and the frame header of the first TDD frame structure is offset to obtain the second TDD frame structure.

[0063] The third feasible frame structure design method is as follows: the first TDD frame structure is the base frame structure, the number of GP slots in the first TDD frame structure is N (N is a positive integer), the sum of the number of DL slots and UL slots in the first TDD frame structure is greater than N, and the frame header of the first TDD frame structure is offset to obtain the second TDD frame structure.

[0064] In the TDD frame structure design in this paper, regardless of which design scheme is adopted, the frame header offset of the second TDD frame structure relative to the first TDD frame structure is configured as the sum of the number of UL timeslots and the number of DL timeslots in the first TDD frame structure, or the frame header offset is configured as the number of GP timeslots in the first TDD frame structure.

[0065] Based on the frame structure implementation scheme designed above, when multiple TDD frame structures exist in the same cell, no uplink or downlink conflicts will occur on the network device side in any time slot. On the terminal side, no inter-terminal interference will occur between any two terminals in the terminal set using the same frame structure (or between any two users belonging to the same user group).

[0066] However, for example, as shown in Figure 2, when two frame structures exist in the same cell, the excessively large propagation distance of the satellite-to-ground link requires users to use large timing advance values ​​when transmitting uplink on the satellite-to-ground link, for example, TA of 1.69 milliseconds or 2.48 milliseconds. Downlink reception will also experience a large order of magnitude transmission delay. Therefore, a situation may arise where one terminal in the set of terminals using the basic TDD frame structure and another terminal in the set of terminals using the frame header offset version of the TDD frame structure are receiving downlink while the other is transmitting uplink. If these two terminals are close to each other, "inter-terminal co-channel cross-link interference" will occur. This interference between different user groups newly introduced on the user side (i.e., the terminal side) can be simply referred to as "inter-user group interference." In Figure 2, the nadir point can be used to indicate, for example, the intersection of the line connecting the satellite to the Earth's center and the Earth's surface, and the boundary point can be used to indicate, for example, the farthest point within the satellite's coverage area.

[0067] Regarding the aforementioned "inter-terminal co-channel cross-link interference," there exists a sub-scenario of interference: potential co-channel cross-link interference between "terminals transmitting uplink signals" and "terminals receiving necessary downlink common signaling" within a cell. The interference avoidance strategy designed in this application for this interference scenario will be described below.

[0068] Figure 3 is a schematic diagram of an exemplary embodiment of an interference avoidance method based on TDD multi-frame structure shown in this application. As shown in Figure 3, the interference avoidance method based on TDD multi-frame structure is applied to a network device and includes the following steps:

[0069] S301, transmit a first common signaling based on a first TDD frame structure, and transmit a second common signaling based on a second TDD frame structure.

[0070] In this application, the common signaling sent by the network device based on the first TDD frame structure is referred to as the first common signaling.

[0071] In this application, the common signaling sent by the network device based on the second TDD frame structure is referred to as the second common signaling.

[0072] Both the first public signaling and the second public signaling are broadcast to the cell corresponding to the network device.

[0073] Based on the above description, the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure. Furthermore, the second TDD frame structure has the same frame period and the same uplink / downlink time slot configuration as the first TDD frame structure.

[0074] In one embodiment of this disclosure, the name of the network device is not limited. For example, the network device may also be called a base station or a satellite-based base station.

[0075] In one embodiment of this disclosure, the technical solution can be used, for example, in a low Earth orbit satellite system. Specifically, it can be applied to a low Earth orbit (LEO) satellite operating at an altitude of 600 kilometers.

[0076] S302, receiving a first uplink signal sent from a terminal using a first TDD frame structure, and receiving a second uplink signal sent from a terminal using a second TDD frame structure.

[0077] In this application, the uplink signal received by the network device from the terminal using the first TDD frame structure is referred to as the first uplink signal.

[0078] In this application, the uplink signal received by the network device from the terminal using the second TDD frame structure is referred to as the second uplink signal.

[0079] To avoid potential cross-link interference between terminals transmitting uplink signals and receiving necessary downlink common signaling within the cell, this application transmits the first common signaling and the second uplink signal using different frequency domain resources, and the second common signaling and the first uplink signal using different frequency domain resources. This ensures frequency domain isolation between the frequency domain resources used for common signaling transmitted in one frame structure and the frequency domain resources used for uplink signals transmitted in another TDD frame structure, thereby avoiding potential cross-link interference between terminals transmitting uplink signals and receiving necessary downlink common signaling within the cell.

[0080] In some feasible implementations, the first common signaling is transmitted through a first frequency domain resource, and the second uplink signal is transmitted through a second frequency domain resource, with the first and second frequency domain resources located in different sub-bands within the frequency band occupied by the network device's transmitted signal; and the second common signaling is transmitted through a third frequency domain resource, and the first uplink signal is transmitted through a fourth frequency domain resource, with the third and fourth frequency domain resources located in different sub-bands within the frequency band occupied by the network device's transmitted signal. This allows for sub-band-level frequency domain isolation between the frequency domain resources used for common signaling transmitted in one frame structure and the frequency domain resources used for uplink signals transmitted in another TDD frame structure.

[0081] Furthermore, although the names of the first frequency domain resource and the third frequency domain resource are different in the above, the first frequency domain resource and the third frequency domain resource can be the same frequency domain resource or different frequency domain resources.

[0082] Furthermore, although the names of the second frequency domain resource and the fourth frequency domain resource are different in the above, the second frequency domain resource and the fourth frequency domain resource can be the same frequency domain resource or different frequency domain resources.

[0083] In some feasible implementations, based on the fact that the first and second frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmission signal, and that the third and fourth frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmission signal, the network device performs time slot configuration as follows: all downlink time slots on the first TDD frame structure are configured to use the first frequency domain resources, and all uplink time slots on the second TDD frame structure are configured to use the second frequency domain resources. This ensures that the downlink time slots occupied by the first common signaling and the uplink time slots occupied by the second uplink signal occupy different frequency domain resources, thereby ensuring sub-band-level frequency domain isolation between the first common signaling and the second uplink signal. Other schemes can be used to configure the downlink time slots on the second TDD frame structure and the uplink time slots on the first TDD frame structure to achieve sub-band-level frequency domain isolation between the second common signaling and the first uplink signal.

[0084] In some feasible implementations, based on the fact that the first and second frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmission signal, and that the third and fourth frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmission signal, the network device configures time slots as follows: all downlink time slots on the second TDD frame structure are configured to use the third frequency domain resources, and all uplink time slots on the first TDD frame structure are configured to use the fourth frequency domain resources. This ensures that the downlink time slots occupied by the second common signaling and the uplink time slots occupied by the first uplink signal occupy different frequency domain resources, thereby ensuring sub-band-level frequency domain isolation between the second common signaling and the first uplink signal. Other schemes can be used for frequency domain configuration of the downlink time slots on the first TDD frame structure and the uplink time slots on the second TDD frame structure to achieve sub-band-level frequency domain isolation between the first common signaling and the second uplink signal.

[0085] In some feasible implementations, based on the fact that the first frequency domain resources and the second frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmission signal, and that the third frequency domain resources and the fourth frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmission signal, the network device's time slot configuration scheme is as follows: all downlink time slots on the first TDD frame structure are configured to use the first frequency domain resources, and all uplink time slots on the second TDD frame structure are configured to use the second frequency domain resources; all downlink time slots on the second TDD frame structure are configured to use the third frequency domain resources, and all uplink time slots on the first TDD frame structure are configured to use the fourth frequency domain resources. This approach is relatively simple and straightforward. It ensures that the downlink time slot occupied by the first common signaling and the uplink time slot occupied by the second uplink signal occupy different frequency domain resources, thereby guaranteeing sub-band level frequency domain isolation between the first common signaling and the second uplink signal.

[0086] It is important to understand that when adopting the above frame structure design scheme, it is often necessary to adapt the transmission scheme of the common signaling. Based on three adaptability design schemes, the following describes the avoidance schemes for the co-channel cross-link interference that may exist between "terminals that are transmitting uplink signals" and "terminals that are receiving necessary downlink common signaling" in the cell under each adaptability design scheme.

[0087] All three adaptation design schemes adopt the mechanism of separating signaling beams and service beams, which is commonly used in FDD systems.

[0088] In the following three adaptation design schemes, the common signaling sent by the network device based on the first TDD frame structure is referred to as the first common signaling; the common signaling sent by the network device based on the second TDD frame structure is referred to as the second common signaling; the uplink signal received by the network device from the terminal using the first TDD frame structure is referred to as the first uplink signal; and the uplink signal received by the network device from the terminal using the second TDD frame structure is referred to as the second uplink signal. The second TDD frame structure is generated by offsetting the first TDD frame structure based on a fixed frame header offset, and the second TDD frame structure has the same frame period and the same uplink / downlink time slot configuration as the first TDD frame structure.

[0089] First adaptive design scheme:

[0090] Figure 4 is a schematic diagram of the first adaptability design scheme shown in this application. As shown in Figure 4, the network device configures one or more terminals in the Radio Resource Control (RRC) idle state to use the first TDD frame structure to perform pre-scheduling signal transmission (pre-scheduling signal transmission includes at least: receiving the first common signaling broadcast by the network device before the terminal initiates initial random access, sending a random access preamble signal by the terminal, and receiving a random access response sent by the network device by the terminal).

[0091] After any one of one or more terminals completes signal transmission before being scheduled, that terminal is configured to use either the first TDD frame structure for signal transmission after being scheduled, or the second TDD frame structure for signal transmission after being scheduled. Whether a terminal is scheduled to use the first or second TDD frame structure for signal transmission after completing signal transmission before being scheduled can be determined by grouping based on beamwidth or other geographical separation principles, or by balancing the number of user terminals in the two groups. Here, beamwidth represents the projection area of ​​the beam on the ground; in actual systems, if the width of the signaling beam is larger than the service beam, the projection area of ​​the signaling beam on the ground is usually used as the representation of beamwidth.

[0092] It is easy to understand that the network device sends the first common signaling to the cell based on the first TDD frame structure. After any terminal completes the signal transmission before being scheduled, it is configured to use the first TDD frame structure for the signal transmission after being scheduled (taking the connected terminal 1 as an example in Figure 4). In the signal transmission after being scheduled, the terminal still uses the first TDD frame structure to receive the first common signaling sent by the network device based on the first TDD frame structure. Also, when uplink signal transmission is required, the terminal still sends the first uplink signal to the network device based on the first TDD frame structure. Correspondingly, the network device can receive the first uplink signal sent by the terminal using the first TDD frame structure.

[0093] It is easy to understand that the network device sends the second common signaling to the cell based on the second TDD frame structure. After any terminal completes the signal transmission before being scheduled, it is configured to use the second TDD frame structure for the signal transmission after being scheduled (taking the connected terminal 2 as an example in Figure 4). In the signal transmission after being scheduled, the terminal uses the second TDD frame structure to receive the second common signaling sent by the network device based on the second TDD frame structure. Also, when uplink signal transmission is required, the terminal sends the second uplink signal to the network device based on the second TDD frame structure. Correspondingly, the network device can receive the second uplink signal sent by the terminal using the second TDD frame structure.

[0094] In this embodiment, the first common signaling is carried by the signaling beam, and the second common signaling is carried by the service beam.

[0095] Depending on the network configuration of the network devices and the location of the signaling beam carrying the first common signaling within the cell, the first common signaling may include different signals. In other words, it can be understood that the signals included in the first common signaling can be determined based on the network configuration of the network devices and the location of the signaling beam carrying the first common signaling within the cell.

[0096] Among them, the networking methods of the above-mentioned network devices can be two: one is to use the TDD standard to provide seamless coverage across the entire area, and the other is to use the FDD and TDD standards to form a two-layer networking method (that is, the FDD standard is used as the network coverage layer to achieve full coverage, and the TDD standard is used as the network capacity layer to provide on-demand expansion services for local areas).

[0097] Among them, the signaling beam carrying the first public signaling currently serves two types of positions within the cell: edge positions and non-edge positions. Figure 5 is a schematic diagram of edge and non-edge positions shown in this application. As shown in Figure 5, edge and non-edge positions are determined according to the boundary of the network device's coverage area and a preset distance threshold. That is, it can be understood that the cell positions are divided into an inner circle and an outer circle according to the boundary of the network device's coverage area and the preset distance threshold. Positions included in the outer circle are edge positions, and positions included in the inner circle are non-edge positions.

[0098] In some embodiments, when the network device adopts a networking method that provides seamless full-area coverage using the TDD standard, and the position of the signaling beam carrying the first common signaling is currently served by an edge position within the cell, the first common signaling includes a Cell-defining SSB (CD-SSB), a System Information Block (SIB) 1, and other System Information (OSI) that can be used to define the cell, wherein the OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

[0099] In some embodiments, when the network device adopts a networking method that provides seamless full coverage using the TDD standard, and the signaling beam carrying the first common signaling is currently serving a non-edge position within the cell, the first common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB19.

[0100] In some embodiments, when the network device adopts a two-layer networking method using FDD and TDD standards, and the signaling beam carrying the first common signaling currently serves any position of a TDD cell, the first common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

[0101] Among them, SIB2, SIB3, and SIB4 mainly carry information related to cell reselection on the same frequency and different frequencies; SIB6, SIB7, and SIB8 mainly carry early warning information for natural disasters such as earthquakes and tsunamis; and SIB19 carries ephemeris information.

[0102] SIB1 can be scheduled to be transmitted in a time slot immediately following CD-SSB.

[0103] The bandwidth occupied by OSI is usually no more than that occupied by SIB1, so the frequency domain range of the air interface resources for transmitting OSI can be arranged as a subset of the frequency domain range of SIB1.

[0104] For any given wave position, the number of times the first common signaling carried by the signaling beam appears in the downlink time slot of its corresponding first TDD frame structure is determined by the revisit period of the signaling beam for that wave position. The signaling beam is used for broadcasting synchronization signals and system messages and for initial access of terminals. The signaling beam provides services for different wave positions using a time-division polling mechanism.

[0105] The second common signaling carried by the service beam includes only the Non-cell-defining SSB (NCD-SSB), which cannot be used to define a cell. The transmission period of the NCD-SSB is greater than or equal to the transmission period of the CD-SSB carried by the signaling beam. Terminals scheduled to use the second TDD frame structure can perform measurements for Radio Resource Management (RRM), Radio Link Monitoring (RLM), and Beam Failure Detection (BFD) by receiving the NCD-SSB.

[0106] Specifically, when the first uplink signal is a random access preamble (Msg1), the uplink time slot occupied by the first uplink signal in the first TDD frame structure is the time-domain resource corresponding to the random access channel occasion (RACH occasion) configured by the network device for the terminal using the first TDD frame structure. Here, the first uplink signal is transmitted through the fourth frequency domain resource, and the second common signaling carried by the service beam is transmitted through the third frequency domain resource. The third and fourth frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmission signal, thereby achieving sub-band-level frequency domain isolation between the second common signaling sent by the network device based on the second TDD frame structure and the first uplink signal sent by the terminal based on the first TDD frame structure.

[0107] In this embodiment, the second uplink signal will not be a random access preamble signal, because the terminal can only be configured to use the second TDD frame structure after the terminal has completed the signal transmission before being scheduled (including the terminal sending a random access preamble signal). At this time, the signal transmission before being scheduled has been completed, and no random access preamble signal will be sent on the second TDD frame structure.

[0108] Wherein, when the first uplink signal is an uplink signal other than the random access preamble signal (for example, the first uplink signal is the first uplink signal sent by a terminal in the connected state when it is configured to use the first TDD frame structure), and the downlink time slot corresponding to the second common signaling in the second TDD frame structure belongs to the same frame period (as mentioned above, the second common signaling only includes NCD-SSB, so the downlink time slot corresponding to the second common signaling in the second TDD frame structure must belong to the same frame period), Figure 6 is a schematic diagram of the time slots occupied by the first uplink signal and the second common signaling shown in this application. As shown in Figure 6, the first uplink signal occupies at least one uplink time slot in the uplink time slot group of the first TDD frame structure, and the downlink time slot corresponding to the second common signaling in the second TDD frame structure belongs to a downlink time slot group, which is immediately adjacent to the downlink time slot group. The first uplink signal and the second common signaling need to be isolated in the sub-band frequency domain. The second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third frequency domain resource and the fourth frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to realize the sub-band frequency domain isolation between the second common signaling sent by the network device based on the second TDD frame structure and the first uplink signal sent by the terminal based on the first TDD frame structure.

[0109] Wherein, when the second uplink signal is an uplink signal other than the random access preamble (for example, the second uplink signal is the second uplink signal sent by a terminal in the connected state when configured to use the second TDD frame structure), and the downlink time slot corresponding to the first common signaling in the first TDD frame structure belongs to the same frame period (that is, the downlink time slots corresponding to the CD-SSB, SIB1 and OSI included in the first common signaling mentioned above belong to the same frame period in the first TDD frame structure), Figure 7 is a schematic diagram of the time slots occupied by the second uplink signal and the first common signaling shown in this application. As shown in Figure 7, the second uplink signal occupies at least one uplink time slot in the uplink time slot group of the second TDD frame structure, and the downlink time slot corresponding to the first common signaling in the first TDD frame structure belongs to a downlink time slot group, which is immediately adjacent to the downlink time slot group. The second uplink signal needs to be isolated from the first common signaling at the sub-band level in the frequency domain. The first common signaling is transmitted through the first frequency domain resources, and the second uplink signal is transmitted through the second frequency domain resources. The first frequency domain resources and the second frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to achieve sub-band level frequency domain isolation between the first common signaling sent by the network device based on the first TDD frame structure and the second uplink signal sent by the terminal based on the second TDD frame structure.

[0110] Whether the transmission period of the common signaling is the same as the frame period will affect the frequency at which subband-level frequency division scheduling needs to be executed. For example, if the transmission period of CD-SSB is 20ms (specifically, it is transmitted several times in the first 5ms of every 20ms), that is, the transmission period of the first common signaling is 20ms, if the frame period is lengthened to 20ms, it is equivalent to requiring each group of consecutive UL time slots in the second TDD frame structure to be isolated from the first common signaling at the subband level frequency domain. If the frame period is kept at 10ms, then only one of every two groups of consecutive UL time slots in the second TDD frame structure needs to be isolated from the first common signaling at the subband level frequency domain. As mentioned earlier, for any given frequency position, the number of times the first common signaling carried by the signaling beam appears in the downlink time slot of its corresponding first TDD frame structure is determined by the revisit period of the signaling beam for that given frequency position. Therefore, for any user in any frequency position with the aforementioned interference avoidance requirement, every revisit period of one frequency position (usually tens or hundreds of milliseconds when the system is configured for a single satellite and a single cell) is required to isolate the corresponding set of consecutive UL time slots in the second TDD frame structure from the first common signaling at the sub-band level frequency domain.

[0111] Specifically, when the second uplink signal is an uplink signal other than the random access preamble (for example, the second uplink signal is a second uplink signal sent by a terminal in the connected state when configured to use the second TDD frame structure), and multiple parts of the first common signaling occupy at least one downlink time slot in multiple downlink time slot groups of different frame periods within the first TDD frame structure (for example, CD-SSB and SIB1 included in the first common signaling are sent in frame period 1, while OSI included in the first common signaling is sent in frame period 2), (After period 1 and in the adjacent frame period 2, it is transmitted). Figure 8 is a schematic diagram of the time slots occupied by the second uplink signal and the first common signaling shown in this application. As shown in Figure 8, the second uplink signal occupies at least one uplink time slot in each of the multiple uplink time slot groups (uplink time slot group 1 and uplink time slot group 2) of the second TDD frame structure. The multiple uplink time slot groups (uplink time slot group 1 and uplink time slot group 2) are adjacent to each other after the multiple downlink time slot groups (downlink time slot group 1 and downlink time slot group 2) corresponding to the multiple parts of the first common signaling. Figure 8 illustrates that the first part and the second part of the first common signaling are transmitted in two frame cycles respectively. The first part of the first common signaling occupies one or more downlink time slots within downlink time slot group 1, and the second part occupies one or more downlink time slots within downlink time slot group 2. The second uplink signal occupies one or more uplink time slots within uplink time slot group 1 immediately following downlink time slot group 1, and also occupies one or more uplink time slots within uplink time slot group 2 immediately following downlink time slot group 2. The second uplink signal needs to be isolated from the first common signaling at the sub-band level. Here, the first common signaling is transmitted through the first frequency domain resource, and the second uplink signal is transmitted through the second frequency domain resource. The first frequency domain resource and the second frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to achieve sub-band level frequency domain isolation between the first common signaling transmitted by the network device based on the first TDD frame structure and the second uplink signal transmitted by the terminal based on the second TDD frame structure.

[0112] The second adaptive design scheme:

[0113] Figure 9 is a schematic diagram of the second adaptability design scheme shown in this application. As shown in Figure 9, the network device configures one or more terminals in the RRC idle state to use the second TDD frame structure to perform pre-scheduling signal transmission (pre-scheduling signal transmission includes at least: receiving the second common signaling broadcast by the network device before the terminal initiates initial random access, sending a random access preamble signal by the terminal, and receiving a random access response sent by the network device by the terminal).

[0114] After any one of the one or more terminals completes signal transmission before being scheduled, that terminal is configured to use either the first TDD frame structure for signal transmission after being scheduled, or the second TDD frame structure for signal transmission after being scheduled. Whether a terminal is scheduled to use the first or second TDD frame structure for signal transmission after completing its pre-scheduling signal transmission can be determined by grouping based on wavelength or other geographical separation principles, or by grouping based on a balance of the number of user terminals in the two groups.

[0115] It is easy to understand that the network device sends the first common signaling to the cell based on the first TDD frame structure. After any terminal completes the signal transmission before being scheduled, it is configured to use the first TDD frame structure for the signal transmission after being scheduled (taking the connected terminal 1 as an example in Figure 9). In the signal transmission after being scheduled, the terminal uses the first TDD frame structure to receive the first common signaling sent by the network device based on the first TDD frame structure. Also, when uplink signal transmission is required, the terminal sends the first uplink signal to the network device based on the first TDD frame structure. Correspondingly, the network device can receive the first uplink signal sent by the terminal using the first TDD frame structure.

[0116] It is easy to understand that the network device sends the second common signaling to the cell based on the second TDD frame structure. After any terminal completes the signal transmission before being scheduled, it is configured to use the second TDD frame structure for the signal transmission after being scheduled (taking the connected terminal 2 as an example in Figure 9). In the signal transmission after being scheduled, the terminal uses the second TDD frame structure to receive the second common signaling sent by the network device based on the second TDD frame structure. Also, when uplink signal transmission is required, the terminal sends the second uplink signal to the network device based on the second TDD frame structure. Correspondingly, the network device can receive the second uplink signal sent by the terminal using the second TDD frame structure.

[0117] In this embodiment, the first common signaling is carried by the service beam, and the second common signaling is carried by the signaling beam.

[0118] Depending on the network configuration of the network devices and the location of the signaling beam carrying the second common signaling within the cell, the second common signaling can include different signals. In other words, it can be understood that the signals included in the second common signaling can be determined based on the network configuration of the network devices and the location of the signaling beam carrying the second common signaling within the cell.

[0119] Among them, the networking methods of the above-mentioned network devices can be two: one is to use the TDD standard to provide seamless coverage across the entire area, and the other is to use the FDD and TDD standards to form a two-layer networking method (that is, the FDD standard is used as the network coverage layer to achieve full coverage, and the TDD standard is used as the network capacity layer to provide on-demand expansion services for local areas).

[0120] The signaling beam carrying the second public signaling currently serves two types of positions within the cell: edge positions and non-edge positions. Edge and non-edge positions are determined based on the boundaries of the network device's coverage area and a preset distance threshold, as detailed in Figure 5.

[0121] In some embodiments, when the network device adopts a networking method that provides seamless full-area coverage using the TDD standard, and the signaling beam carrying the second common signaling is currently serving an edge position within the cell, the second common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

[0122] In some embodiments, when the network device adopts a networking method that provides seamless full coverage using the TDD standard, and the signaling beam carrying the second common signaling is currently serving a non-edge position within the cell, the second common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB19.

[0123] In some embodiments, when the network device adopts a two-layer networking method using FDD and TDD standards, and the signaling beam carrying the second common signaling currently serves any position of a TDD cell, the second common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

[0124] Among them, SIB2, SIB3, and SIB4 mainly carry information related to cell reselection on the same frequency and different frequencies; SIB6, SIB7, and SIB8 mainly carry early warning information for natural disasters such as earthquakes and tsunamis; and SIB19 carries ephemeris information.

[0125] SIB1 can be scheduled to be transmitted in a time slot immediately following CD-SSB.

[0126] The bandwidth occupied by OSI is usually no more than that occupied by SIB1, so the frequency domain range of the air interface resources for transmitting OSI can be arranged as a subset of the frequency domain range of SIB1.

[0127] For any given wave position, the number of times the second common signaling carried by the signaling beam appears in the downlink time slot of its corresponding second TDD frame structure is determined by the revisit period of the signaling beam for that wave position. The signaling beam is used for broadcasting synchronization signals and system messages and for initial access of terminals. The signaling beam provides services for different wave positions using a time-division polling mechanism.

[0128] The first common signaling carried by the service beam includes only NCD-SSB, wherein the transmission period of NCD-SSB is greater than or equal to the transmission period of CD-SSB carried by the signaling beam. Terminals scheduled to use the first TDD frame structure can complete measurements for RRM, RLM, and BFD by receiving NCD-SSB.

[0129] Wherein, when the second uplink signal is a random access preamble, the uplink time slot occupied by the second uplink signal in the second TDD frame structure is the time-domain resource corresponding to the random access channel timing configured by the network device for the terminal using the second TDD frame structure. Here, the second uplink signal is transmitted through the second frequency domain resource, and the first common signaling carried by the service beam is transmitted through the first frequency domain resource. The first frequency domain resource and the second frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmission signal, so as to achieve sub-band-level frequency domain isolation between the first common signaling sent by the network device based on the first TDD frame structure and the second uplink signal sent by the terminal based on the second TDD frame structure.

[0130] In this embodiment, the first uplink signal will not be a random access preamble signal, because the terminal can only be configured to use the first TDD frame structure after it has completed the signal transmission before being scheduled (including the terminal sending the random access preamble signal). At this time, the signal transmission before being scheduled has been completed, and the random access preamble signal will not be sent on the first TDD frame structure.

[0131] When the first uplink signal is an uplink signal other than the random access preamble (for example, the first uplink signal is the first uplink signal sent by a terminal in the connected state when configured to use the first TDD frame structure), and the downlink time slots corresponding to the second common signaling in the second TDD frame structure belong to the same frame period (that is, the downlink time slots corresponding to the CD-SSB, SIB1, and OSI included in the second common signaling mentioned above belong to the same frame period in the second TDD frame structure), the first uplink signal occupies at least one uplink time slot in the uplink time slot group of the first TDD frame structure, and the downlink time slots corresponding to the second common signaling in the second TDD frame structure belong to a downlink time slot group, which is immediately adjacent to the downlink time slot group. For details, please refer to the schematic diagram in Figure 6. Here, only the signal content included in the second common signaling is different. The design concept is the same. The first uplink signal and the second common signaling need to be isolated in the sub-band frequency domain. Here, the second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third frequency domain resource and the fourth frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to realize the sub-band frequency domain isolation between the second common signaling sent by the network device based on the second TDD frame structure and the first uplink signal sent by the terminal based on the first TDD frame structure.

[0132] When the second uplink signal is an uplink signal other than the random access preamble (for example, the second uplink signal is the second uplink signal sent by a terminal in the connected state when configured to use the second TDD frame structure), and the downlink time slot corresponding to the first common signaling in the first TDD frame structure belongs to the same frame period (as mentioned above, the first common signaling only includes NCD-SSB, so the downlink time slot corresponding to the first common signaling in the first TDD frame structure must belong to the same frame period), the second uplink signal occupies at least one uplink time slot in the uplink time slot group of the second TDD frame structure, and the downlink time slot corresponding to the first common signaling in the first TDD frame structure belongs to a downlink time slot group, which is immediately adjacent to the downlink time slot group. For details, please refer to the schematic diagram in Figure 7. Here, only the signal content included in the first common signaling is different; the design concept is the same. The second uplink signal needs to be isolated from the first common signaling at the sub-band level. Here, the first common signaling is transmitted through the first frequency domain resource, and the second uplink signal is transmitted through the second frequency domain resource. The first frequency domain resource and the second frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to achieve sub-band level frequency domain isolation between the first common signaling sent by the network device based on the first TDD frame structure and the second uplink signal sent by the terminal based on the second TDD frame structure.

[0133] When the first uplink signal is an uplink signal other than the random access preamble (for example, the first uplink signal is the first uplink signal sent by a terminal in the connected state when configured to use the first TDD frame structure), and multiple parts of the second common signaling occupy at least one downlink time slot in multiple downlink time slot groups of different frame periods within the second TDD frame structure (for example, the CD-SSB and SIB1 included in the second common signaling are sent in frame period 1, while the OSI included in the second common signaling is sent in frame period 1). (The next frame period 2 is transmitted). Figure 10 is a schematic diagram of the time slots occupied by the first uplink signal and the second common signaling shown in this application. As shown in Figure 10, the first uplink signal occupies at least one uplink time slot in each of the multiple uplink time slot groups (uplink time slot group 1 and uplink time slot group 2) of the first TDD frame structure. The multiple uplink time slot groups (uplink time slot group 1 and uplink time slot group 2) are adjacent to each other after the multiple downlink time slot groups (downlink time slot group 1 and downlink time slot group 2) corresponding to the multiple parts of the second common signaling. Figure 10 illustrates that the first part of the second common signaling and the second part of the second common signaling are transmitted in two frame periods respectively. The first part of the second common signaling occupies one or more downlink time slots in downlink time slot group 1, and the second part of the second common signaling occupies one or more downlink time slots in downlink time slot group 2. The first uplink signal occupies one or more uplink time slots in uplink time slot group 1 immediately following downlink time slot group 1, and also occupies one or more uplink time slots in uplink time slot group 2 immediately following downlink time slot group 2. The first uplink signal needs to be isolated from the second common signaling at the sub-band level. Here, the second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third frequency domain resource and the fourth frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to achieve sub-band level frequency domain isolation between the second common signaling transmitted by the network device based on the second TDD frame structure and the first uplink signal transmitted by the terminal based on the first TDD frame structure.

[0134] The third adaptive design scheme:

[0135] Figure 11 is a schematic diagram of the third adaptability design scheme shown in this application, and is for illustrative purposes only. According to the 3GPP protocol definition of SSB signal configuration in downlink common signaling, when using the commonly used Case C SSB configuration, for any given frame structure, the CD-SSB is transmitted in the first four time slots within every 20ms duration (not necessarily in every single time slot within the first four time slots). Therefore, when SSB is transmitted in the first k (k<=4) time slots within every 20ms calculated from the frame header of the first TDD frame structure, and simultaneously in the first k (k<=4) time slots within every 20ms calculated from the frame header of the second TDD frame structure, the SSBs transmitted in the two frame structures are staggered in the time domain and do not affect each other. Taking the first feasible frame structure design configuration as an example (assuming the frame period is 10ms, the subcarrier spacing is 30kHz, the number of GP slots in the first TDD frame structure is N=10, the sum of the number of DL slots and UL slots in the first TDD frame structure is equal to N, and the length of the frame header offset in the second TDD frame structure is N=10 slots), when SSB is transmitted in the first two slots of every 20ms calculated from the frame header in the first TDD frame structure, and simultaneously in the first two slots of every 20ms calculated from the frame header in the second TDD frame structure, from the perspective of the satellite base station, when the first and second TDD frame structures are not distinguished and only the available slots are counted, in the example described, based on the first round of SSB transmission in the first and second TDD frame structures, CD-SSB will be transmitted in the 1st, 2nd, 11th, and 12th available slots.

[0136] Based on the above design concept, this application can be designed such that the first common signaling is transmitted in the downlink time slot of the first TDD frame structure, and the second common signaling is transmitted in the downlink time slot of the second TDD frame structure. Both the first and second common signaling are carried by signaling beams.

[0137] Figure 12 is a schematic diagram of a third adaptability design scheme shown in this application. As shown in Figure 12, the network device configures a first portion of the terminals in the RRC idle state of the cell it covers to use a first TDD frame structure for pre-scheduling signal transmission (pre-scheduling signal transmission includes at least: receiving a first common signaling broadcast by the network device before the terminal initiates initial random access, sending a random access preamble signal by the terminal, and receiving a random access response sent by the network device by the terminal). After any terminal in the first portion of terminals completes the pre-scheduling signal transmission, the terminal is configured to use the first TDD frame structure or the second TDD frame structure for post-scheduling signal transmission. Alternatively, after any terminal in the first portion of terminals completes the pre-scheduling signal transmission, the terminal is configured to use the same TDD frame structure as before scheduling (i.e., the first TDD frame structure) for post-scheduling signal transmission.

[0138] As shown in Figure 12, the network device configures a second group of terminals among multiple terminals in the RRC idle state within its covered cell to use a second TDD frame structure for pre-scheduling signal transmission (pre-scheduling signal transmission includes at least: receiving the second common signaling broadcast by the network device before the terminal initiates initial random access, sending a random access preamble signal, and receiving a random access response sent by the network device). After any terminal in the second group completes the pre-scheduling signal transmission, the terminal is configured to use either the first TDD frame structure or the second TDD frame structure for post-scheduling signal transmission. Alternatively, after any terminal in the second group completes the pre-scheduling signal transmission, the terminal is configured to use the same TDD frame structure as before scheduling (i.e., the second TDD frame structure) for post-scheduling signal transmission.

[0139] The terminals in the first part and the terminals in the second part that are in the RRC idle state together constitute all terminals in the RRC idle state within the cell covered by the network device. The division of the first part and the second part can be based on wave positions, on the balance of the number of terminals, or on other principles such as randomness. As an example, if the division of the first part and the second part is based on wave positions, then after any terminal completes the signal transmission before being scheduled, if the terminal has not changed its wave position due to its own mobility, then the terminal will be configured to use the same TDD structure as when it was transmitting signals before being scheduled when transmitting signals after being scheduled.

[0140] It is easy to understand that the network device sends the first common signaling to the cell based on the first TDD frame structure. After any terminal completes the signal transmission before being scheduled, it is configured to use the first TDD frame structure for the signal transmission after being scheduled (taking the connected terminal 1 as an example in Figure 12). In the signal transmission after being scheduled, the terminal uses the first TDD frame structure to receive the first common signaling sent by the network device based on the first TDD frame structure. Also, when uplink signal transmission is required, the terminal still sends the first uplink signal to the network device based on the first TDD frame structure. Correspondingly, the network device can receive the first uplink signal sent by the terminal using the first TDD frame structure.

[0141] It is easy to understand that the network device sends the second common signaling to the cell based on the second TDD frame structure. After any terminal completes the signal transmission before being scheduled, it is configured to use the second TDD frame structure for the signal transmission after being scheduled (taking the connected terminal 2 as an example in Figure 12). In the signal transmission after being scheduled, the terminal uses the second TDD frame structure to receive the second common signaling sent by the network device based on the second TDD frame structure. Also, when uplink signal transmission is required, the terminal sends the second uplink signal to the network device based on the second TDD frame structure. Correspondingly, the network device can receive the second uplink signal sent by the terminal using the second TDD frame structure.

[0142] Depending on the network equipment's networking configuration and the location of the signaling beam currently serving the first or second common signaling within the cell, the first or second common signaling may include different signals. In other words, it can be understood that the signals included in the first or second common signaling can be determined based on the network equipment's networking configuration and the location of the signaling beam currently serving the first or second common signaling within the cell.

[0143] Among them, the networking methods of the above-mentioned network devices can be two: one is to use the TDD standard to provide seamless coverage across the entire area, and the other is to use the FDD and TDD standards to form a two-layer networking method (that is, the FDD standard is used as the network coverage layer to achieve full coverage, and the TDD standard is used as the network capacity layer to provide on-demand expansion services for local areas).

[0144] The signaling beam carrying the first or second public signaling is currently serving one of two positions within the cell: an edge position or a non-edge position. The edge and non-edge positions are determined based on the boundaries of the network device's coverage area and a preset distance threshold.

[0145] In some embodiments, when the network device adopts a networking method that provides seamless full-area coverage using the TDD standard, and the signaling beam carrying the first common signaling is currently serving an edge position within the cell, the first common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

[0146] In some embodiments, when the network device adopts a networking method that provides seamless full-area coverage using the TDD standard, and the signaling beam carrying the second common signaling is currently serving an edge position within the cell, the second common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

[0147] In some embodiments, when the network device adopts a networking method that provides seamless full coverage using the TDD standard, and the signaling beam carrying the first common signaling is currently serving a non-edge position within the cell, the first common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB19.

[0148] In some embodiments, when the network device adopts a networking method that provides seamless full coverage using the TDD standard, and the signaling beam carrying the second common signaling is currently serving a non-edge position within the cell, the second common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB19.

[0149] In some embodiments, when the network device adopts a two-layer networking method using FDD and TDD standards, and the signaling beam carrying the first common signaling currently serves any position of a TDD cell, the first common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

[0150] In some embodiments, when the network device adopts a two-layer networking method using FDD and TDD standards, and the signaling beam carrying the second common signaling currently serves any position of a TDD cell, the second common signaling includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

[0151] Among them, SIB2, SIB3, and SIB4 mainly carry information related to cell reselection on the same frequency and different frequencies; SIB6, SIB7, and SIB8 mainly carry early warning information for natural disasters such as earthquakes and tsunamis; and SIB19 carries ephemeris information.

[0152] SIB1 can be scheduled to be transmitted in a time slot immediately following CD-SSB.

[0153] The bandwidth occupied by OSI is usually no more than that occupied by SIB1, so the frequency domain range of the air interface resources for transmitting OSI can be arranged as a subset of the frequency domain range of SIB1.

[0154] For any given wave position, the number of times the first common signaling carried by the signaling beam appears in the downlink time slot of its corresponding first TDD frame structure is determined by the revisit period of the signaling beam for that wave position. The signaling beam is used for broadcasting synchronization signals and system messages and for initial access of terminals. The signaling beam provides services for different wave positions using a time-division polling mechanism.

[0155] For any given wave position, the number of times the second common signaling carried by the signaling beam appears in the downlink time slot of its corresponding second TDD frame structure is determined by the revisit period of the signaling beam for that wave position. The signaling beam is used for broadcasting synchronization signals and system messages and for initial access of terminals. The signaling beam provides services for different wave positions using a time-division polling mechanism.

[0156] Wherein, when the first uplink signal is a random access preamble, the uplink time slot occupied by the first uplink signal in the first TDD frame structure is the time-domain resource corresponding to the random access channel timing configured by the network device for the terminal using the first TDD frame structure. Here, the first uplink signal is transmitted through the fourth frequency domain resource, and the aforementioned second common signaling is transmitted through the third frequency domain resource. The third frequency domain resource and the fourth frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to achieve sub-band-level frequency domain isolation between the second common signaling sent by the network device based on the second TDD frame structure and the first uplink signal sent by the terminal based on the first TDD frame structure.

[0157] Wherein, when the second uplink signal is a random access preamble, the uplink time slot occupied by the second uplink signal in the second TDD frame structure is the time-domain resource corresponding to the random access channel timing configured by the network device for the terminal using the second TDD frame structure. Here, the second uplink signal is transmitted through the second frequency domain resource, and the aforementioned first common signaling is transmitted through the first frequency domain resource. The first frequency domain resource and the second frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmission signal, so as to achieve sub-band-level frequency domain isolation between the first common signaling sent by the network device based on the first TDD frame structure and the second uplink signal sent by the terminal based on the second TDD frame structure.

[0158] Specifically, when the first uplink signal is an uplink signal other than the random access preamble (for example, the first uplink signal is sent by a terminal in connected state when configured to use the first TDD frame structure), and the downlink time slots corresponding to the second common signaling within the second TDD frame structure belong to the same frame period (i.e., the downlink time slots corresponding to CD-SSB, SIB1, and OSI included in the second common signaling described above belong to the same frame period within the second TDD frame structure), the first uplink signal occupies at least one uplink time slot within the uplink time slot group of the first TDD frame structure, and the downlink time slot corresponding to the second common signaling within the second TDD frame structure belongs to a downlink time slot group, which is immediately adjacent to the downlink time slot group. Refer to Figure 6 for details; the design concept is the same, only the signals included in the second common signaling in Figure 6 are different. The first uplink signal and the second common signaling need to be isolated in the sub-band frequency domain. Here, the second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third frequency domain resource and the fourth frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to realize the sub-band frequency domain isolation between the second common signaling sent by the network device based on the second TDD frame structure and the first uplink signal sent by the terminal based on the first TDD frame structure.

[0159] Specifically, when the second uplink signal is an uplink signal other than the random access preamble (for example, the second uplink signal is the second uplink signal sent by a terminal in the connected state when configured to use the second TDD frame structure), and the downlink time slot corresponding to the first common signaling in the first TDD frame structure belongs to the same frame period (that is, the downlink time slots corresponding to the CD-SSB, SIB1, and OSI included in the first common signaling mentioned above belong to the same frame period in the first TDD frame structure), the second uplink signal occupies at least one uplink time slot in the uplink time slot group of the second TDD frame structure, and the downlink time slot corresponding to the first common signaling in the first TDD frame structure belongs to a downlink time slot group, which is immediately adjacent to the downlink time slot group. For details, please refer to the relevant description in Figure 7. The design concept is the same. The second uplink signal needs to be isolated from the first common signaling at the sub-band level. Here, the first common signaling is transmitted through the first frequency domain resource, and the second uplink signal is transmitted through the second frequency domain resource. The first frequency domain resource and the second frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to achieve sub-band level frequency domain isolation between the first common signaling sent by the network device based on the first TDD frame structure and the second uplink signal sent by the terminal based on the second TDD frame structure.

[0160] Specifically, when the second uplink signal is an uplink signal other than the random access preamble (for example, the second uplink signal is the second uplink signal sent by a terminal in the connected state when configured to use the second TDD frame structure), and multiple parts of the first common signaling occupy at least one downlink time slot in multiple downlink time slot groups of different frame periods within the first TDD frame structure (for example, CD-SSB and SIB1 included in the first common signaling are sent in frame period 1, while OSI included in the first common signaling is sent in frame period 2, which is adjacent to and follows frame period 1), the second uplink signal occupies at least one uplink time slot in multiple uplink time slot groups of the second TDD frame structure. These multiple uplink time slot groups are adjacent to and follow multiple downlink time slot groups corresponding to multiple parts of the first common signaling. For details, please refer to the relevant description in Figure 8. The design concept is the same. The second uplink signal needs to be isolated from the first common signaling at the sub-band level. Here, the first common signaling is transmitted through the first frequency domain resource, and the second uplink signal is transmitted through the second frequency domain resource. The first frequency domain resource and the second frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to achieve sub-band level frequency domain isolation between the first common signaling sent by the network device based on the first TDD frame structure and the second uplink signal sent by the terminal based on the second TDD frame structure.

[0161] Specifically, when the first uplink signal is an uplink signal other than the random access preamble (for example, the first uplink signal is sent by a terminal in connected state when configured to use the first TDD frame structure), and multiple parts of the second common signaling occupy at least one downlink time slot in multiple downlink time slot groups belonging to different frame periods within the second TDD frame structure (for example, CD-SSB and SIB1 included in the second common signaling are sent in frame period 1, while OSI included in the second common signaling is sent in frame period 2, which is adjacent to and follows frame period 1), the first uplink signal occupies at least one uplink time slot in each of the multiple uplink time slot groups of the first TDD frame structure. These multiple uplink time slot groups are adjacent to and follow the multiple downlink time slot groups corresponding to the multiple parts of the second common signaling. Refer to Figure 10 for details; the design approach is the same. The first uplink signal and the second common signaling need to be isolated in the sub-band frequency domain. Here, the second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third frequency domain resource and the fourth frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal, so as to realize the sub-band frequency domain isolation between the second common signaling sent by the network device based on the second TDD frame structure and the first uplink signal sent by the terminal based on the first TDD frame structure.

[0162] When any of the three adaptability design schemes mentioned above is used to avoid potential co-channel cross-link interference between terminals using one of the TDD frame structures that are transmitting uplink signals and terminals using another TDD frame structure that are receiving necessary downlink common signaling within a cell, based on sub-band frequency domain isolation, and the corresponding signal transmission and reception do occur, residual inter-terminal co-channel inter-sub-band cross-link interference may exist. Figure 13 is a schematic diagram illustrating one type of inter-UE co-channel inter-sub-band cross-link interference. This application can coordinate terminal scheduling based on physical layer L1 or network layer L3 measurements of the interference to eliminate residual inter-terminal co-channel inter-sub-band cross-link interference, or it can use an advanced UE receiver to eliminate residual inter-terminal co-channel inter-sub-band cross-link interference.

[0163] Furthermore, when each network device avoids potential cross-channel interference between "terminals transmitting uplink signals" and "terminals receiving necessary downlink common signaling" within its own cell, if the strategy adopted is the design scheme described in the above embodiment, which "allows the frequency domain resources used to transmit downlink common signaling on one TDD frame structure to be isolated from the frequency domain resources used to transmit uplink signals on another TDD frame structure," then because all network devices in the same system typically use the same downlink common signaling transmission timing configuration, this kind of inter-terminal interference avoidance is naturally achieved between cells as well.

[0164] In addition, an "inter-cell geographic area fencing" scheme can be considered to avoid terminal-side interference between cells (i.e., each network device, based on the geographic location information reported by the terminal, allows terminals located in the outer ring of the cell to use only the first TDD frame structure, while only terminals located in the inner ring of the cell are scheduled to use either the first or second TDD frame structure). Based on the characteristics of the "inter-cell geographic area fencing" scheme, it can be seen that this scheme can avoid any additional inter-cell terminal-side interference that might be introduced by the use of multiple frame structures. Therefore, it can naturally also avoid potential co-channel cross-link interference between "terminals transmitting uplink signals" and "terminals using another frame structure that are receiving necessary downlink common signaling" within a cell.

[0165] Figure 14 is a schematic diagram of an interference avoidance method based on a time-division duplex (TDD) multi-frame structure, as shown in this application. This method is executed by a terminal device, and the specific steps are as follows:

[0166] S1401, when the terminal uses the first TDD frame structure, it sends a first uplink signal to the network device and receives the first common signaling sent by the network device based on the first TDD frame structure.

[0167] S1402, when the terminal uses the second TDD frame structure, the terminal sends a second uplink signal to the network device and receives a second common signaling sent by the network device based on the second TDD frame structure.

[0168] The first common signaling and the second uplink signal are transmitted through different frequency domain resources.

[0169] The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

[0170] In some embodiments, the first common signaling is transmitted through a first frequency domain resource, and the second uplink signal is transmitted through a second frequency domain resource, wherein the first and second frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmitted signal; and the second common signaling is transmitted through a third frequency domain resource, and the first uplink signal is transmitted through a fourth frequency domain resource, wherein the third and fourth frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmitted signal. This enables sub-band-level frequency domain isolation between the frequency domain resources used for common signaling transmitted in one frame structure and the frequency domain resources used for uplink signals transmitted in another TDD frame structure.

[0171] In some embodiments, although the names of the first frequency domain resource and the third frequency domain resource are different in the above description, the first frequency domain resource and the third frequency domain resource may be the same frequency domain resource or different frequency domain resources.

[0172] In some embodiments, although the names of the second frequency domain resource and the fourth frequency domain resource are different in the above description, the second frequency domain resource and the fourth frequency domain resource may be the same frequency domain resource or different frequency domain resources.

[0173] When the first adaptability design scheme in the above network-side embodiment is adopted, see the relevant description of the first adaptability design scheme for details. In this scheme, if the terminal is in the RRC idle state, the terminal uses the first TDD frame structure to perform signal transmission before being scheduled, and after the terminal completes the signal transmission before being scheduled, the terminal is configured to use the first TDD frame structure or the second TDD frame structure to perform signal transmission after being scheduled.

[0174] The signal transmission before scheduling includes at least: receiving the first common signaling broadcast by the network device before the terminal initiates initial random access, sending a random access preamble signal, and receiving a random access response sent by the network device.

[0175] In some embodiments, after any terminal completes signal transmission before being scheduled, that terminal is configured to use either a first TDD frame structure or a second TDD frame structure for signal transmission after being scheduled. Whether a terminal is configured to use the first TDD frame structure or the second TDD frame structure for signal transmission after being scheduled can be determined by grouping based on wavelength or other geographical separation principles, or by grouping based on a balance of the number of users in the two groups.

[0176] In some embodiments, after any terminal completes signal transmission before being scheduled, it is configured to use a first TDD frame structure for signal transmission after being scheduled. In the signal transmission after being scheduled, the terminal uses the first TDD frame structure to receive a first common signaling sent by the network device based on the first TDD frame structure, and when uplink signal transmission is required, the terminal sends a first uplink signal to the network device based on the first TDD frame structure.

[0177] In some embodiments, after any terminal completes signal transmission before being scheduled, it is configured to use a second TDD frame structure for signal transmission after being scheduled. In the signal transmission after being scheduled, the terminal uses the second TDD frame structure to receive a second common signaling sent by the network device based on the second TDD frame structure, and when uplink signal transmission is required, the terminal sends a second uplink signal to the network device based on the second TDD frame structure.

[0178] Among them, the first common signaling is carried by the signaling beam, and the second common signaling is carried by the service beam.

[0179] In some embodiments, for a terminal, if it is configured to use the first TDD frame structure when transmitting signals before scheduling or when transmitting signals after scheduling, the first common signaling it receives has the following three cases:

[0180] 1. When the terminal's position within the cell is an edge position and the network configuration is TDD to provide seamless full coverage, the first common signaling carried by the signaling beam includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19; the edge position is determined based on the boundary of the network device's coverage area and a preset distance threshold.

[0181] 2. When the terminal is located in a non-edge position within the cell and the network topology is TDD to provide seamless full coverage, the first common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein OSI includes at least SIB19; wherein, the non-edge position is determined according to the boundary of the coverage area of ​​the network device and the preset distance threshold.

[0182] 3. When the networking method is a two-layer networking using FDD and TDD standards, and the terminal is currently served by a TDD standard cell, the first common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8 and SIB19.

[0183] In some embodiments, if a terminal is configured to use a second TDD frame structure for post-scheduled signal transmission after completing pre-scheduled signal transmission, the second common signaling received by the terminal based on the second TDD frame structure in the post-scheduled signal transmission only includes NCD-SSB, wherein the transmission period of NCD-SSB is greater than or equal to the transmission period of CD-SSB carried by the signaling beam.

[0184] Specifically, the first common signaling is transmitted through the first frequency domain resource, and the second uplink signal is transmitted through the second frequency domain resource. The first and second frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmitted signal. Furthermore, the second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third and fourth frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmitted signal. This ensures sub-band-level frequency domain isolation between the frequency domain resources used for common signaling transmitted in one frame structure and the frequency domain resources used for uplink signals transmitted in another TDD frame structure.

[0185] When the second adaptability design scheme in the above network-side embodiment is adopted, see the relevant description of the second adaptability design scheme for details. In this scheme, if the terminal is in the RRC idle state, the terminal uses the second TDD frame structure to transmit signals before being scheduled. After the terminal completes the signal transmission before being scheduled, the terminal is configured to use the first TDD frame structure or the second TDD frame structure to transmit signals after being scheduled.

[0186] The signal transmission before scheduling includes at least: receiving the second common signaling broadcast by the network device before the terminal initiates initial random access, sending a random access preamble signal, and receiving a random access response sent by the network device.

[0187] In some embodiments, after any terminal completes signal transmission before being scheduled, that terminal is configured to use either a first TDD frame structure or a second TDD frame structure for signal transmission after being scheduled. Whether a terminal is configured to use the first TDD frame structure or the second TDD frame structure for signal transmission after being scheduled can be determined by grouping based on wavelength or other geographical separation principles, or by grouping based on a balance of the number of users in the two groups.

[0188] In some embodiments, after any terminal completes signal transmission before being scheduled, it is configured to use a first TDD frame structure for signal transmission after being scheduled. In the signal transmission after being scheduled, the terminal uses the first TDD frame structure to receive a first common signaling sent by the network device based on the first TDD frame structure, and when uplink signal transmission is required, the terminal sends a first uplink signal to the network device based on the first TDD frame structure.

[0189] In some embodiments, after any terminal completes signal transmission before being scheduled, it is configured to use a second TDD frame structure for signal transmission after being scheduled. In the signal transmission after being scheduled, the terminal uses the second TDD frame structure to receive a second common signaling sent by the network device based on the second TDD frame structure, and when uplink signal transmission is required, the terminal sends a second uplink signal to the network device based on the second TDD frame structure.

[0190] Among them, the first common signaling is carried by the service beam, and the second common signaling is carried by the signaling beam.

[0191] In some embodiments, if a terminal is configured to use a second TDD frame structure during signal transmission before or after scheduling, the second common signaling it receives may fall into the following three categories:

[0192] 1. When the terminal's position within the cell is an edge position and the network configuration is TDD to provide seamless full coverage, the second common signaling carried by the signaling beam includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19; the edge position is determined based on the boundary of the network device's coverage area and a preset distance threshold.

[0193] 2. When the terminal is located in a non-edge position within the cell and the network topology is TDD to provide seamless full coverage, the second common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein OSI includes at least SIB19; wherein, the non-edge position is determined according to the boundary of the coverage area of ​​the network device and the preset distance threshold.

[0194] 3. When the networking method is a two-layer networking using FDD and TDD standards, and the terminal is currently served by a TDD standard cell, the second common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8 and SIB19.

[0195] In some embodiments, if a terminal is configured to use a first TDD frame structure for post-scheduling signal transmission after completing pre-scheduling signal transmission, the first common signaling received by the terminal based on the first TDD frame structure in the post-scheduling signal transmission only includes NCD-SSB, wherein the transmission period of NCD-SSB is greater than or equal to the transmission period of CD-SSB carried by the signaling beam.

[0196] Specifically, the first common signaling is transmitted through the first frequency domain resource, and the second uplink signal is transmitted through the second frequency domain resource. The first and second frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmitted signal. Furthermore, the second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third and fourth frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmitted signal. This ensures sub-band-level frequency domain isolation between the frequency domain resources used for common signaling transmitted in one frame structure and the frequency domain resources used for uplink signals transmitted in another TDD frame structure.

[0197] When the third adaptation design scheme in the above network side embodiment is adopted, see the relevant description of the third adaptation design scheme for details. If the terminal is in the RRC idle state, the terminal can randomly or based on the waveform configuration use the first TDD frame structure or the second TDD frame structure to perform signal transmission before being scheduled.

[0198] In some embodiments, when a terminal is a terminal in the first part of the cell that is in the RRC idle state, it uses a first TDD frame structure to perform pre-scheduling signal transmission (pre-scheduling signal transmission includes at least: receiving a first common signaling broadcast by the network device before the terminal initiates initial random access, sending a random access preamble signal, and receiving a random access response sent by the network device). After any terminal in the first part of the terminals completes the pre-scheduling signal transmission, that terminal is configured to use the first TDD frame structure or the second TDD frame structure in the subsequent post-scheduling signal transmission. Alternatively, after any terminal in the first part of the terminals completes the pre-scheduling signal transmission, that terminal is configured to use the same TDD frame structure (i.e., the first TDD frame structure) as when performing post-scheduling signal transmission.

[0199] In some embodiments, when a terminal is a terminal in the second part of the cell that is in the RRC idle state, it uses the second TDD frame structure to perform pre-scheduling signal transmission (pre-scheduling signal transmission includes at least: receiving the second common signaling broadcast by the network device before the terminal initiates initial random access, sending a random access preamble signal, and receiving a random access response sent by the network device). After any terminal in the second part of the terminals completes the pre-scheduling signal transmission, that terminal is configured to use the first TDD frame structure or the second TDD frame structure in the subsequent post-scheduling signal transmission. Alternatively, after any terminal in the second part of the terminals completes the pre-scheduling signal transmission, that terminal is configured to use the same TDD frame structure (i.e., the second TDD frame structure) as when performing post-scheduling signal transmission.

[0200] The terminals in the first part and the terminals in the second part that are in the RRC idle state together constitute all terminals in the RRC idle state within the cell covered by the network device. The division of the first part and the second part can be based on wave positions, on the balance of the number of terminals, or on other principles such as randomness. In some embodiments, if the division of the first part and the second part is based on wave positions, then after any terminal completes the signal transmission before being scheduled, if the terminal has not changed its wave position due to its own mobility, the terminal will be configured to use the same TDD frame structure as when it performed the signal transmission before being scheduled when performing the signal transmission after being scheduled.

[0201] In some embodiments, after any terminal completes signal transmission before being scheduled, it is configured to use a first TDD frame structure for signal transmission after being scheduled. In the signal transmission after being scheduled, the terminal uses the first TDD frame structure to receive a first common signaling sent by the network device based on the first TDD frame structure, and when uplink signal transmission is required, the terminal sends a first uplink signal to the network device based on the first TDD frame structure.

[0202] In some embodiments, after any terminal completes signal transmission before being scheduled, it is configured to use a second TDD frame structure for signal transmission after being scheduled. In the signal transmission after being scheduled, the terminal uses the second TDD frame structure to receive a second common signaling sent by the network device based on the second TDD frame structure, and when uplink signal transmission is required, the terminal sends a second uplink signal to the network device based on the second TDD frame structure.

[0203] Both the first and second common signaling are carried by signaling beams.

[0204] In some embodiments, if a terminal is configured to use a second TDD frame structure during signal transmission before or after scheduling, the second common signaling it receives may fall into the following three categories:

[0205] 1. When the terminal's position within the cell is an edge position and the network configuration is TDD to provide seamless full coverage, the second common signaling carried by the signaling beam includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19; the edge position is determined based on the boundary of the network device's coverage area and a preset distance threshold.

[0206] 2. When the terminal is located in a non-edge position within the cell and the network topology is TDD to provide seamless full coverage, the second common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein OSI includes at least SIB19; wherein, the non-edge position is determined according to the boundary of the coverage area of ​​the network device and the preset distance threshold.

[0207] 3. When the networking method is a two-layer networking using FDD and TDD standards, and the terminal is currently served by a TDD standard cell, the second common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8 and SIB19.

[0208] In some embodiments, for a terminal, if it is configured to use the first TDD frame structure when transmitting signals before scheduling or when transmitting signals after scheduling, the first common signaling it receives has the following three cases:

[0209] 1. When the terminal's position within the cell is an edge position and the network configuration is TDD to provide seamless full coverage, the first common signaling carried by the signaling beam includes CD-SSB, SIB1, and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19; the edge position is determined based on the boundary of the network device's coverage area and a preset distance threshold.

[0210] 2. When the terminal is located in a non-edge position within the cell and the network topology is TDD to provide seamless full coverage, the first common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein OSI includes at least SIB19; wherein, the non-edge position is determined according to the boundary of the coverage area of ​​the network device and the preset distance threshold.

[0211] 3. When the networking method is a two-layer networking using FDD and TDD standards, and the terminal is currently served by a TDD standard cell, the first common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8 and SIB19.

[0212] Specifically, the first common signaling is transmitted through the first frequency domain resource, and the second uplink signal is transmitted through the second frequency domain resource. The first and second frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmitted signal. Furthermore, the second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third and fourth frequency domain resources are located in different sub-bands within the frequency band occupied by the network device's transmitted signal. This ensures sub-band-level frequency domain isolation between the frequency domain resources used for common signaling transmitted in one frame structure and the frequency domain resources used for uplink signals transmitted in another TDD frame structure.

[0213] Figure 15 is a schematic diagram of an interference avoidance device based on a time-division duplex (TDD) multi-frame structure shown in this application. As shown in Figure 15, the interference avoidance device 1500 based on the TDD multi-frame structure includes a transmitting module 1501 and a receiving module 1502, wherein:

[0214] The transmitting module 1501 is used to transmit a first common signaling based on a first TDD frame structure, and to transmit a second common signaling based on a second TDD frame structure.

[0215] The receiving module 1502 is configured to receive a first uplink signal transmitted from a terminal using a first TDD frame structure, and to receive a second uplink signal transmitted from a terminal using a second TDD frame structure.

[0216] The first common signaling and the second uplink signal are transmitted through different frequency domain resources.

[0217] The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

[0218] In this device, the first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources. In this way, the frequency domain resources used by the common signaling transmitted in one frame structure and the frequency domain resources used by the uplink signal transmitted in another TDD frame structure can be isolated in the frequency domain, thereby avoiding the co-channel cross-link interference that may exist between "terminals that are transmitting uplink signals" and "terminals that are receiving necessary downlink common signaling" in the cell.

[0219] Figure 16 is a schematic diagram of an interference avoidance device based on a time-division duplex (TDD) multi-frame structure shown in this application. As shown in Figure 16, the interference avoidance device 1600 based on the TDD multi-frame structure includes a transmitting module 1601 and a receiving module 1602, wherein:

[0220] The transmitting module 1601 is configured to: transmit a first uplink signal to the network device based on the first TDD frame structure when the terminal uses the first TDD frame structure, or transmit a second uplink signal to the network device based on the second TDD frame structure when the terminal uses the second TDD frame structure.

[0221] The receiving module 1602 is configured to: receive a first common signaling sent by a network device based on the first TDD frame structure when the terminal uses the first TDD frame structure, or receive a second common signaling sent by a network device based on the second TDD frame structure when the terminal uses the second TDD frame structure.

[0222] The first common signaling and the second uplink signal are transmitted through different frequency domain resources.

[0223] The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

[0224] In this device, the first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources. In this way, the frequency domain resources used by the common signaling transmitted in one frame structure and the frequency domain resources used by the uplink signal transmitted in another TDD frame structure can be isolated in the frequency domain, thereby avoiding the co-channel cross-link interference that may exist between "terminals that are transmitting uplink signals" and "terminals that are receiving necessary downlink common signaling" in the cell.

[0225] To implement the above embodiments, this application also proposes a network device 1700, as shown in FIG17. The network device 1700 includes a processor 1701 and a memory 1702 communicatively connected to the processor. The memory 1702 stores instructions that can be executed by at least one processor. The instructions are executed by at least one processor 1701 to implement the interference avoidance method based on TDD multi-frame structure on the network device side as shown in the above embodiments.

[0226] To implement the above embodiments, this application also proposes a terminal 1800, as shown in FIG18. The terminal 1800 includes a processor 1801 and a memory 1802 communicatively connected to the processor. The memory 1802 stores instructions that can be executed by at least one processor. The instructions are executed by at least one processor 1801 to implement the interference avoidance method based on TDD multi-frame structure on the terminal side as shown in the above embodiments.

[0227] To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause a computer to execute the interference avoidance method based on TDD multi-frame structure on the network device side or to execute the interference avoidance method based on TDD multi-frame structure on the terminal side.

[0228] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0229] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0230] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0231] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An interference avoidance method based on a time-division duplex (TDD) multi-frame structure, characterized in that, Applied to network devices, including: First common signaling is transmitted based on the first TDD frame structure, and second common signaling is transmitted based on the second TDD frame structure; Receive a first uplink signal sent from a terminal using the first TDD frame structure, and receive a second uplink signal sent from a terminal using the second TDD frame structure; The first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources. The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

2. The method according to claim 1, characterized in that, in: The first common signaling is transmitted through a first frequency domain resource, and the second uplink signal is transmitted through a second frequency domain resource. The first frequency domain resource and the second frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signals; and, The second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third frequency domain resource and the fourth frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal.

3. The method according to claim 2, characterized in that, in: The first frequency domain resource and the third frequency domain resource are either the same frequency domain resource or different frequency domain resources; The second frequency domain resource and the fourth frequency domain resource are either the same frequency domain resource or different frequency domain resources.

4. The method according to claim 2 or 3, characterized in that, The network device uses at least one of the following schemes for time slot configuration: All downlink time slots on the first TDD frame structure are configured to use the first frequency domain resources, and all uplink time slots on the second TDD frame structure are configured to use the second frequency domain resources; All downlink slots on the second TDD frame structure are configured to use the third frequency domain resources, and all uplink slots on the first TDD frame structure are configured to use the fourth frequency domain resources.

5. The method according to any one of claims 1-3, characterized in that, The method further includes: The first common signaling is carried by a signaling beam, and the second common signaling is carried by a service beam.

6. The method according to any one of claims 1-3, characterized in that, The method further includes: The first common signaling is carried by the service beam, and the second common signaling is carried by the signaling beam.

7. The method according to any one of claims 1-3, characterized in that, The method further includes: Both the first common signaling and the second common signaling are carried by signaling beams.

8. The method according to any one of claims 5-7, characterized in that, For any given wave position, the number of times the common signaling carried by the signaling beam appears in the downlink time slot of its corresponding TDD frame structure is determined by the revisit period of the signaling beam for that given wave position. The signaling beam is used for broadcasting synchronization signals and system messages and for initial access of terminals. The signaling beam provides services for different wave positions using a time-division polling mechanism.

9. The method according to claim 8, characterized in that, The signals contained in the common signaling carried by the signaling beam are determined based on the following: Based on the networking method of the network devices and the location of the signaling beam currently served by the signaling beam carrying the public signaling within the cell, the signal contained in the public signaling is determined. The networking method is either a network device using TDD standard to provide seamless full-area coverage, or a network device using both Frequency Division Duplex (FDD) and TDD standards for a two-layer networking. The location of the wave position within the cell is either an edge wave position or a non-edge wave position. The edge wave position and the non-edge wave position are determined based on the boundary of the coverage area of ​​the network device and a preset distance threshold.

10. The method according to claim 9, characterized in that, The step of determining the signals included in the public signaling based on the network device's networking configuration and the location of the signaling beam currently served by the signaling beam carrying the public signaling within the cell includes: When the network equipment adopts a networking method that provides seamless full-area coverage using the TDD standard, and the signaling beam carrying the public signaling is currently serving a position within the cell that is the edge position, the public signaling includes a synchronization signal block CD-SSB, a system information block SIB1, and other system information OSIs that can be used to define the cell, wherein the OSIs include at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

11. The method according to claim 9, characterized in that, The step of determining the signals included in the public signaling based on the network device's networking configuration and the location of the signaling beam currently served by the signaling beam carrying the public signaling within the cell includes: When the network device adopts a networking method that provides seamless full-area coverage using the TDD standard, and the signaling beam carrying the public signaling is currently serving a non-edge position within the cell, the public signaling includes CD-SSB, SIB1, and OSI, wherein the OSI includes at least SIB19.

12. The method according to claim 9, characterized in that, The step of determining the signals included in the public signaling based on the network device's networking configuration and the location of the signaling beam currently served by the signaling beam carrying the public signaling within the cell includes: When the network device adopts a two-layer networking method using FDD and TDD standards, and the signaling beam carrying the common signaling currently serves any position of a TDD cell, the common signaling includes CD-SSB, SIB1, and OSI, wherein the OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

13. The method according to claim 5 or 6, characterized in that, The public signaling carried by the service beam includes only the synchronization signal block NCD-SSB, which cannot be used to define the cell, wherein the transmission period of the NCD-SSB is greater than or equal to the transmission period of the CD-SSB carried by the signaling beam.

14. The method according to claim 5, characterized in that, The network device configures one or more terminals in the Radio Resource Control (RRC) idle state to use the first TDD frame structure for pre-scheduling signal transmission, and configures any one of the one or more terminals to use the first TDD frame structure or the second TDD frame structure for post-scheduling signal transmission.

15. The method according to claim 6, characterized in that, The network device configures one or more terminals in the RRC idle state to use the second TDD frame structure for pre-scheduling signal transmission, and configures any one of the one or more terminals to use the first TDD frame structure or the second TDD frame structure for post-scheduling signal transmission.

16. The method according to claim 7, characterized in that, The network device configures a portion of the multiple terminals in the RRC idle state within its covered cell to use the first TDD frame structure for signal transmission before scheduling, and configures another portion of the terminals to use the second TDD frame structure for signal transmission before scheduling. Furthermore, any one of the plurality of terminals is configured to use the first TDD frame structure or the second TDD frame structure for signal transmission after scheduling, or any one of the plurality of terminals is configured to use the same TDD frame structure as before scheduling for signal transmission after scheduling.

17. The method according to any one of claims 14-16, characterized in that, The signal transmission prior to scheduling includes at least: receiving public signaling broadcast by the network device before the terminal initiates initial random access, sending a random access preamble signal, and receiving a random access response sent from the network device.

18. The method according to claim 5 or 7, characterized in that, The first uplink signal is a random access preamble signal, and the uplink time slot occupied by the first TDD frame structure is the time domain resource corresponding to the random access channel timing configured by the network device for the terminal using the first TDD frame structure.

19. The method according to claim 6 or 7, characterized in that, The second uplink signal is a random access preamble signal, and the uplink time slot occupied by the second TDD frame structure is the time domain resource corresponding to the random access channel timing configured by the network device for the terminal using the second TDD frame structure.

20. The method according to any one of claims 5-7, characterized in that, in: When the second uplink signal is an uplink signal other than the random access preamble signal, and the downlink time slot corresponding to the first common signaling in the first TDD frame structure belongs to the same frame period, the second uplink signal occupies at least one uplink time slot in the uplink time slot group of the second TDD frame structure, and the downlink time slot corresponding to the first common signaling in the first TDD frame structure belongs to a downlink time slot group, and the uplink time slot group is immediately after the downlink time slot group.

21. The method according to any one of claims 5-7, characterized in that, in: When the first uplink signal is an uplink signal other than the random access preamble signal, and the downlink time slot corresponding to the second common signaling in the second TDD frame structure belongs to the same frame period, the first uplink signal occupies at least one uplink time slot in the uplink time slot group of the first TDD frame structure, and the downlink time slot corresponding to the second common signaling in the second TDD frame structure belongs to a downlink time slot group, and the uplink time slot group is immediately after the downlink time slot group.

22. The method according to claim 5 or 7, characterized in that, in: When the second uplink signal is an uplink signal other than the random access preamble signal, and multiple parts of the first common signaling occupy at least one downlink time slot in multiple downlink time slot groups belonging to different frame periods within the first TDD frame structure, the second uplink signal occupies at least one uplink time slot in multiple uplink time slot groups within the second TDD frame structure, and the multiple uplink time slot groups are adjacent to each other after the multiple downlink time slot groups.

23. The method according to claim 6 or 7, characterized in that, in: When the first uplink signal is an uplink signal other than the random access preamble signal, and multiple parts of the second common signaling occupy at least one downlink time slot in multiple downlink time slot groups belonging to different frame periods within the second TDD frame structure, the first uplink signal occupies at least one uplink time slot in each of the multiple uplink time slot groups within the first TDD frame structure, and the multiple uplink time slot groups are adjacent to each other after the multiple downlink time slot groups.

24. The method according to any one of claims 1-23, characterized in that, The frame header offset is configured as the sum of the number of uplink time slots and the number of downlink time slots in the first TDD frame structure, or the frame header offset is configured as the number of guard interval time slots in the first TDD frame structure.

25. An interference avoidance method based on a time-division duplex (TDD) multi-frame structure, characterized in that, Applied to terminals, including: When the terminal uses the first TDD frame structure, it sends a first uplink signal to the network device and receives a first common signaling sent by the network device based on the first TDD frame structure. When the terminal uses the second TDD frame structure, it sends a second uplink signal to the network device and receives a second common signaling sent by the network device based on the second TDD frame structure. The first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources. The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

26. The method according to claim 25, characterized in that, in: The first common signaling is transmitted through a first frequency domain resource, and the second uplink signal is transmitted through a second frequency domain resource. The first frequency domain resource and the second frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signals; and, The second common signaling is transmitted through the third frequency domain resource, and the first uplink signal is transmitted through the fourth frequency domain resource. The third frequency domain resource and the fourth frequency domain resource are located in different sub-bands within the frequency band occupied by the network device's transmitted signal.

27. The method according to claim 26, characterized in that, in: The first frequency domain resource and the third frequency domain resource are either the same frequency domain resource or different frequency domain resources; The second frequency domain resource and the fourth frequency domain resource are either the same frequency domain resource or different frequency domain resources.

28. The method according to any one of claims 25-27, characterized in that, The method further includes: The first common signaling is carried by a signaling beam, and the second common signaling is carried by a service beam.

29. The method according to any one of claims 25-27, characterized in that, The method further includes: The first common signaling is carried by the service beam, and the second common signaling is carried by the signaling beam.

30. The method according to any one of claims 25-27, characterized in that, The method further includes: Both the first common signaling and the second common signaling are carried by signaling beams.

31. The method according to any one of claims 28-30, characterized in that, The method further includes: When the terminal is located at an edge position within the cell and the networking method is TDD to provide seamless full coverage, the common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein the OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8 and SIB19. The edge wave position is determined based on the boundary of the coverage area of ​​the network device and a preset distance threshold.

32. The method according to any one of claims 28-30, characterized in that, The method further includes: When the terminal is located at a non-edge position within the cell and the networking method is TDD to provide seamless coverage across the entire area, the common signaling carried by the signaling beam includes CD-SSB, SIB1 and OSI, wherein the OSI includes at least SIB19. The non-edge wave position is determined based on the boundary of the coverage area of ​​the network device and a preset distance threshold.

33. The method according to any one of claims 28-30, characterized in that, The method further includes: When the networking method is a two-layer networking using both FDD and TDD standards, and the terminal is currently served by a TDD standard cell, the common signaling carried by the signaling beam includes CD-SSB, SIB1, and OSI, wherein the OSI includes at least SIB2, SIB3, SIB4, SIB6, SIB7, SIB8, and SIB19.

34. The method according to claim 28 or 29, characterized in that, The public signaling carried by the service beam includes only NCD-SSB, wherein the transmission period of the NCD-SSB is greater than or equal to the transmission period of the CD-SSB carried by the signaling beam.

35. The method according to claim 28, characterized in that, The method further includes: When the terminal is in RRC idle state, it uses the first TDD frame structure for signal transmission before being scheduled, and uses the first TDD frame structure or the second TDD frame structure for signal transmission after being scheduled.

36. The method according to claim 29, characterized in that, The method further includes: When the terminal is in RRC idle state, it uses the second TDD frame structure for signal transmission before being scheduled, and uses the first TDD frame structure or the second TDD frame structure for signal transmission after being scheduled.

37. The method according to claim 30, characterized in that, The method further includes: When the terminal is in RRC idle state, it uses the first TDD frame structure or the second TDD frame structure to transmit signals before being scheduled, and uses the first TDD frame structure or the second TDD frame structure to transmit signals after being scheduled, or uses the same TDD frame structure as before being scheduled to transmit signals after being scheduled.

38. The method according to any one of claims 35-37, characterized in that, The signal transmission prior to scheduling includes at least: receiving public signaling broadcast by the network device before initiating initial random access, sending a random access preamble signal, and receiving a random access response sent from the network device.

39. An interference avoidance device based on a time-division duplex (TDD) multi-frame structure, applied to network equipment, characterized in that, include: The transmitting module is configured to transmit a first common signaling based on a first TDD frame structure, and to transmit a second common signaling based on a second TDD frame structure; The receiving module is configured to receive a first uplink signal transmitted from a terminal using the first TDD frame structure, and to receive a second uplink signal transmitted from a terminal using the second TDD frame structure. The first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources. The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

40. An interference avoidance device based on a time-division duplex (TDD) multi-frame structure, characterized in that, Applied to terminals, including: The sending module is configured to: send a first uplink signal to the network device based on the first TDD frame structure when the terminal uses the first TDD frame structure, or send a second uplink signal to the network device based on the second TDD frame structure when the terminal uses the second TDD frame structure. The receiving module is configured to: receive a first common signaling sent by the network device based on the first TDD frame structure when the terminal uses a first TDD frame structure, or receive a second common signaling sent by the network device based on the second TDD frame structure when the terminal uses a second TDD frame structure. The first common signaling and the second uplink signal are transmitted through different frequency domain resources, and the second common signaling and the first uplink signal are transmitted through different frequency domain resources. The second TDD frame structure and the first TDD frame structure have the same frame period and uplink / downlink time slot configuration, and the second TDD frame structure has a fixed frame header offset relative to the first TDD frame structure.

41. A network device, comprising: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-24.

42. A terminal, comprising: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 25-38.

43. A non-transitory computer-readable storage medium storing computer instructions, wherein, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-24 or 25-38.

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