Communication method and apparatus, device, and storage medium

Abstract

The present disclosure provides a communication method and apparatus, a device, and a storage medium. The method comprises: acquiring a TDD frame structure corresponding to any beam position in a cell, wherein multiple TDD frame structures are present in the cell; and sending first indication information to a set of terminals included in any beam position, wherein the first indication information is used for indicating the TDD frame structure. The present disclosure can reduce inter-terminal interference between different beam positions, and can improve the air-interface resource utilization rate of the entire system.

Description

Communication methods, devices, equipment and storage media Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a communication method, apparatus, device and storage medium. Background Technology

[0002] In communication systems, mobile communication networks require the construction of large-scale base stations to achieve wide-area and deep wireless signal coverage. In low-Earth orbit (LEO) satellite systems, frequency division duplexing (FDD) can be used for networking. However, due to the scarcity of available spectrum resources in FDD systems (especially in the spectrum range below 6 GHz), and the low spectrum utilization caused by asymmetric uplink and downlink services, which are the mainstream service types, time division duplexing (TDD) is adopted instead. Improving the utilization rate of air interface time slot resources under TDD becomes a key focus in the design of LEO satellite systems. Summary of the Invention

[0003] This disclosure proposes a communication method, apparatus, device, and storage medium to improve the utilization rate of air interface resources in the entire system.

[0004] According to a first aspect of the present disclosure, a communication method is provided, the method comprising:

[0005] Obtain the Time Division Duplex (TDD) frame structure corresponding to any wave position in the cell, wherein multiple TDD frame structures exist within the cell;

[0006] Send first indication information to the set of terminals included in any of the wavebands, wherein the first indication information is used to indicate the TDD frame structure.

[0007] According to a second aspect of the present disclosure, a communication method is provided, the method comprising:

[0008] The system receives first indication information sent by a network device, wherein the first indication information is used to indicate the TDD frame structure corresponding to the wavelength of the terminal in the cell, and the cell contains multiple TDD frame structures.

[0009] According to a third aspect of the embodiments of this disclosure, a network device is provided, the network device comprising:

[0010] The processing module is used to obtain the TDD frame structure corresponding to any wave position in the cell, wherein there are multiple TDD frame structures in the cell;

[0011] The transceiver module is used to send first indication information to the set of terminals included in any of the waveforms, wherein the first indication information is used to indicate the TDD frame structure.

[0012] According to a fourth aspect of the embodiments of this disclosure, a terminal is provided, the terminal comprising:

[0013] The transceiver module is used to receive first indication information sent by the network device, wherein the first indication information is used to indicate the TDD frame structure corresponding to the wavelength of the terminal in the cell, and there are multiple TDD frame structures in the cell.

[0014] According to a fifth aspect of the embodiments of this disclosure, a network device is provided, comprising:

[0015] One or more processors;

[0016] The network device is used to perform the communication method described in any one of the first aspects.

[0017] According to a sixth aspect of the embodiments of this disclosure, a terminal is provided, comprising:

[0018] One or more processors;

[0019] The terminal is used to execute the communication method described in any of the second aspects.

[0020] According to a seventh aspect of the present disclosure, a communication system is provided, including a terminal and a network device, wherein the network device is configured to implement the communication method according to any one of the first aspects, and the terminal is configured to implement the communication method according to any one of the second aspects.

[0021] According to an eighth aspect of the present disclosure, a storage medium is provided that stores instructions that, when executed on a communication device, cause the communication device to perform a communication method as described in either the first or second aspect. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure;

[0024] Figure 2 is an interactive schematic diagram of a communication method provided in yet another embodiment of this disclosure;

[0025] Figure 3A is a schematic diagram illustrating an example of two frame structures provided in yet another embodiment of this disclosure;

[0026] Figure 3B is a schematic diagram illustrating an example of single-cell service wavelength classification provided in yet another embodiment of this disclosure;

[0027] Figure 3C is a schematic diagram illustrating an example of interference when two frame structures exist in the same cell, according to yet another embodiment of this disclosure.

[0028] Figure 3D is a schematic diagram illustrating an example of a method for determining the mapping relationship between wave position and frame structure provided in another embodiment of this disclosure;

[0029] Figure 3E is a schematic diagram illustrating an example of a communication method provided in yet another embodiment of this disclosure;

[0030] Figure 4 is a flowchart illustrating a communication method provided in yet another embodiment of this disclosure;

[0031] Figure 5 is a flowchart illustrating a communication method provided in yet another embodiment of this disclosure;

[0032] Figure 6A is a schematic diagram of the structure of a network device provided in an embodiment of this disclosure;

[0033] Figure 6B is a schematic diagram of the structure of a terminal provided in an embodiment of this disclosure;

[0034] Figure 7A is a schematic diagram of the structure of a communication device provided in an embodiment of this disclosure;

[0035] Figure 7B is a schematic diagram of the structure of a chip provided in an embodiment of this disclosure. Detailed Implementation

[0036] This disclosure proposes a communication method, apparatus, device, and storage medium to improve the utilization rate of air interface resources in the entire system.

[0037] According to a first aspect of the present disclosure, a communication method is provided, applied to a network device, the method comprising:

[0038] Obtain the TDD frame structure corresponding to any wave position in the cell, wherein multiple TDD frame structures exist within the cell;

[0039] Send first indication information to the set of terminals included in any of the wavebands, wherein the first indication information is used to indicate the TDD frame structure.

[0040] In the above embodiments, a mapping mechanism between wave positions and TDD frame structures can be provided, which can improve the efficiency of networking for TDD standards of low-Earth orbit satellite communication systems. It can obtain the corresponding frame structure of each wave position of each cell, and the set of terminals included in any wave position adopts the TDD frame structure corresponding to any wave position. That is, the terminals in any wave position adopt the same TDD frame structure, which can reduce the inter-terminal interference between different wave positions and improve the air interface resource utilization of the entire system.

[0041] In conjunction with some embodiments of the first aspect, in some embodiments, obtaining the TDD frame structure corresponding to any wave position in the cell includes at least one of the following:

[0042] The TDD frame structure corresponding to any spectral position in the cell is obtained through dynamic configuration.

[0043] The TDD frame structure corresponding to any spectral position in the cell is obtained through static pre-configuration.

[0044] The TDD frame structure corresponding to any spectral position in the cell is obtained through a semi-static configuration method.

[0045] In conjunction with some embodiments of the first aspect, in some embodiments, the plurality of TDD frame structures include a first TDD frame structure and a second TDD frame structure, wherein a first time slot occupied by a first transmission link in the first TDD frame structure corresponds to a first guard period (GP) in the second TDD frame structure, and a second time slot occupied by a second transmission link in the second TDD frame structure corresponds to a second guard period in the first TDD frame structure.

[0046] In conjunction with some embodiments of the first aspect, in some embodiments, both the first protection interval and the second protection interval are greater than the far-point round-trip time (RTT), wherein the far-point round-trip time (RTT) is the maximum round-trip time (RTT) in the round-trip time (RTT) set, and the round-trip time (RTT) set includes the round-trip time (RTT) between the network device and each terminal in the terminal set.

[0047] In the above embodiments, both the first protection interval and the second protection interval are greater than the far-point round-trip time (RTT), which can reduce the co-channel interference of uplink transmission by terminals within the same terminal set on downlink reception of adjacent terminals and improve the air interface resource utilization of the entire system.

[0048] In some embodiments of the first aspect, the second TDD frame structure has a frame header offset value from the first TDD frame structure.

[0049] In conjunction with some embodiments of the first aspect, wherein the first TDD frame structure is a basic TDD frame structure and the second TDD frame structure is a frame header offset version of the TDD frame structure, or the first TDD frame structure is a frame header offset version of the TDD frame structure and the second TDD frame structure is a basic TDD frame structure.

[0050] In some embodiments of the first aspect, the frame header offset value is the length of the first guard interval or the length of the second guard interval.

[0051] In the above embodiments, since the two TDD frame structures are identical and the frame offset length between the two frame structures is equal to the GP length, the inter-terminal interference between different wavelengths can be reduced, and the air interface resource utilization of the entire system can be improved.

[0052] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0053] Based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT, the frame period corresponding to any TDD frame structure among the various TDD frame structures is determined, wherein the far-point RTT is the maximum RTT in the RTT set, and the RTT set includes the RTT between the network device and each terminal in the terminal set.

[0054] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0055] Based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT, the uplink and downlink time slot allocation ratio corresponding to any TDD frame structure among the multiple TDD frame structures is determined, wherein the far-point RTT is the maximum RTT in the RTT set, and the RTT set includes the RTT between the network device and each terminal in the terminal set.

[0056] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0057] The uplink and downlink time slot ratio is adjusted based on at least one of the following: constellation configuration, far-point RTT, and antenna switching delay.

[0058] In the above embodiments, the uplink and downlink time slot ratio can be adjusted to improve the accuracy of obtaining the uplink and downlink time slot ratio, reduce inter-terminal interference between different wavebands, and improve the air interface resource utilization of the entire system.

[0059] In conjunction with some embodiments of the first aspect, in some embodiments, the uplink / downlink time slot ratio is the ratio of downlink time slots, flexible (F) time slots, and uplink time slots, wherein the number of F time slots accounts for half of the number of time slots corresponding to the frame period.

[0060] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0061] The TDD frame structure of any given spectral position is adjusted based on the revisit duration of each Synchronization Signal / PBCH Block (SSB).

[0062] In the above embodiments, the TDD frame structure can be adjusted according to the revisit duration of each SSB, which can improve the matching between the TDD frame structure and the waveform, and improve the air interface resource utilization of the entire system.

[0063] In conjunction with some embodiments of the first aspect, in some embodiments, the revisit duration of each SSB is determined based on beam information, which includes the number of beams, the number of SSB blocks that can be transmitted within each SSB period, and the maximum number of concurrent beams N supported by the on-board antenna. antenna The number N of beams capable of simultaneously transmitting the same SSB block s The number of wavelengths N that a single satellite needs to provide access services under the TDD standard. beam .

[0064] In conjunction with some embodiments of the first aspect, in some embodiments, the first indication information includes the frame period corresponding to any TDD frame structure among the multiple TDD frame structures and the uplink / downlink time slot ratio corresponding to any TDD frame structure.

[0065] In conjunction with some embodiments of the first aspect, in some embodiments, each of the multiple TDD frame structures has the same frame period and uplink / downlink time slot ratio.

[0066] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0067] The timing broadcast SSB and system message corresponding to any of the multiple TDD frame structures are adopted, and the frame period and uplink / downlink time slot ratio corresponding to any of the TDD frame structures are sent to the set of terminals included in any of the wavebands through the first indication information in the system message.

[0068] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0069] Obtain the TDD frame structure and frame header offset value for any given wavelength, wherein the frame header offset value is the offset between the TDD frame structure for any given wavelength and the base TDD frame structure.

[0070] Based on the obtained information related to any wave position and the frame header offset value, the TDD frame structure of any wave position is adjusted to obtain the adjusted TDD frame structure.

[0071] Broadcast SSB and system messages, and send the adjusted TDD frame structure to the terminal set corresponding to any of the wave positions in the system messages via the second indication information.

[0072] In conjunction with some embodiments of the first aspect, in some embodiments, there is at least one reserved symbol in the first TDD frame structure or the second TDD frame structure among the multiple TDD frame structures, the at least one reserved symbol being used for antenna switching delay from downlink to uplink reception when switching from downlink time slot of the first TDD frame structure to uplink time slot of the second TDD frame structure.

[0073] In the above embodiments, when it is determined that there is a switch from downlink time slot to uplink time slot between different frame structures, the antenna switching delay from downlink transmission to uplink reception can be reserved, which can reduce serial interference and improve communication quality.

[0074] In conjunction with some embodiments of the first aspect, in some embodiments, obtaining the TDD frame structure of each spectral position in at least one spectral position of the cell includes:

[0075] Obtain the position information of the wave position and the corresponding traffic volume information of the wave position in the wave position snapshot n under the TDD system, wherein n is a positive integer and the initial value of n is 1;

[0076] Based on the beam traffic information, a beam position set is obtained, wherein the beam position set includes N with the largest traffic volume. beam Each wave position, the N beam The maximum number of wavelengths used to serve a single TDD satellite;

[0077] For the N beam The geographical locations of each wavelength position are clustered to obtain the total traffic volume of each wavelength position cluster in at least one wavelength position cluster.

[0078] If the number of wavelengths in any wavelength cluster does not meet the first requirement, the TDD frame structure adopted by any wavelength cluster is classified according to the total service volume conditions of the various TDD frame structures, and the wavelength snapshot n is obtained.

[0079] If the wavelength snapshot n within the processing capacity or duration threshold corresponding to any wavelength cluster meets the second requirement, the TDD frame structure of any wavelength in at least one wavelength of the cell is obtained.

[0080] In the above embodiments, traffic balancing can be used to balance the traffic between different frame structures as much as possible, improve the accuracy of determining the mapping relationship between wavelets and frame structures, and improve the air interface resource utilization of the entire system.

[0081] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0082] If the wavelength snapshot n within the processing capacity or duration threshold corresponding to any wavelength cluster does not meet the second requirement, the step of obtaining the wavelength position information and the corresponding wavelength traffic volume information in the wavelength snapshot n under the TDD system is re-executed.

[0083] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0084] If the number of wave positions in any wave position cluster meets the first requirement, then the wave position cluster is isolated.

[0085] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0086] If it is determined that there are wave positions in any wave position cluster that do not meet the wave position requirements, the wave positions that do not meet the wave position requirements are removed, and the wave positions that meet the wave position traffic volume selection conditions among the n wave positions are added to the wave position set, wherein the wave position traffic volume selection conditions are the wave positions with the highest wave position traffic volume among the n wave positions excluding the original wave positions.

[0087] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0088] If it is determined that there is inter-terminal interference between the first wave position and the second wave position in the wave position cluster, the interference type corresponding to the inter-terminal interference is obtained.

[0089] An interference avoidance strategy corresponding to the interference type is adopted to adjust the interference between the first wave position and the second wave position.

[0090] In conjunction with some embodiments of the first aspect, in some embodiments, the first and second waveforms before interference adjustment adopt different TDD frame structures and the distance between the first and second waveforms is less than a distance threshold.

[0091] In conjunction with some embodiments of the first aspect, in some embodiments, adjusting the interference between the first wave position and the second wave position includes:

[0092] If the distance between terminals is determined to be less than the estimated distance threshold, the interference between the first and second wavelengths is adjusted using the width of the geographical isolation zone corresponding to the first and second wavelengths. The distance threshold is determined based on the distance between terminals when the interference between the terminals is ignored.

[0093] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0094] The width of the geographical isolation zone is determined based on the geographical threshold corresponding to the terrain where at least one terminal is located.

[0095] According to a second aspect of the embodiments of this disclosure, a communication method is proposed for use in a terminal, comprising:

[0096] The system receives first indication information sent by a network device, wherein the first indication information is used to indicate the TDD frame structure corresponding to the wavelength of the terminal in the cell, and the cell contains multiple TDD frame structures.

[0097] In the above embodiments, the TDD frame structure corresponding to the wavelength of the terminal can be obtained, which can improve the efficiency of networking the TDD standard for low-orbit satellite communication systems. Communication can be carried out through this TDD frame structure, which can reduce inter-terminal interference between different wavelengths, improve the utilization rate of air interface resources of the entire system, and improve communication quality.

[0098] In conjunction with some embodiments of the second aspect, in some embodiments, the plurality of TDD frame structures include a first TDD frame structure and a second TDD frame structure, wherein a first time slot occupied by a first transmission link in the first TDD frame structure corresponds to a first guard interval in the second TDD frame structure, and a second time slot occupied by a second transmission link in the second TDD frame structure corresponds to a second guard interval in the first TDD frame structure.

[0099] In conjunction with some embodiments of the second aspect, in some embodiments, both the first protection interval and the second protection interval are greater than the far-point round-trip time (RTT), the far-point RTT being the maximum RTT in the RTT set, the RTT set including the RTT between the network device and each terminal in the terminal set.

[0100] In conjunction with some embodiments of the second aspect, in some embodiments, the second TDD frame structure has a frame header offset value from the first TDD frame structure.

[0101] In conjunction with some embodiments of the second aspect, in some embodiments, the first TDD frame structure is a basic TDD frame structure, the second TDD frame structure is a frame header offset version of the TDD frame structure, or the first TDD frame structure is a frame header offset version of the TDD frame structure, and the second TDD frame structure is a basic TDD frame structure.

[0102] In conjunction with some embodiments of the second aspect, in some embodiments, the frame header offset value is the length of the first guard interval or the length of the second guard interval.

[0103] In conjunction with some embodiments of the second aspect, in some embodiments, the first indication information includes the frame period corresponding to any TDD frame structure among the multiple TDD frame structures and the uplink / downlink time slot ratio corresponding to any TDD frame structure.

[0104] In conjunction with some embodiments of the second aspect, in some embodiments, each of the multiple TDD frame structures has the same frame period and uplink / downlink time slot ratio.

[0105] In conjunction with some embodiments of the second aspect, in some embodiments, the frame period corresponding to any TDD frame structure is determined by the network device based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT; the uplink / downlink time slot ratio corresponding to any TDD frame structure is determined by the network device based on the far-point RTT and the RTT range corresponding to the far-point RTT; the far-point RTT is the maximum RTT in the RTT set; and the RTT set includes the RTT between the network device and each terminal in the terminal set.

[0106] In conjunction with some embodiments of the second aspect, in some embodiments, the uplink / downlink time slot ratio is the ratio of downlink time slots, F time slots, and uplink time slots, wherein the number of F time slots accounts for half of the number of time slots corresponding to the frame period.

[0107] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0108] The network device receives SSB and system messages broadcast by the network device. The system message includes second indication information, which is used to indicate the adjusted TDD frame structure corresponding to the wavelength. The adjusted TDD frame structure is obtained by the network device by adjusting the TDD frame structure of the wavelength according to the obtained wavelength-related information and frame header offset value. The frame header offset value is the offset value between the TDD frame structure of the wavelength and the basic TDD frame structure.

[0109] In conjunction with some embodiments of the second aspect, in some embodiments, there is at least one reserved symbol in the first TDD frame structure or the second TDD frame structure among the multiple TDD frame structures, the at least one reserved symbol being used for antenna switching delay from downlink to uplink reception when switching from downlink time slot of the first TDD frame structure to uplink time slot of the second TDD frame structure.

[0110] According to a third aspect of the embodiments of this disclosure, a network device is provided, the network device comprising:

[0111] The processing module is used to obtain the TDD frame structure corresponding to any wave position in the cell, wherein there are multiple TDD frame structures in the cell;

[0112] The transceiver module is used to send first indication information to the set of terminals included in any of the waveforms, wherein the first indication information is used to indicate the TDD frame structure.

[0113] According to a fourth aspect of the embodiments of this disclosure, a terminal is provided, the terminal comprising:

[0114] The transceiver module is used to receive first indication information sent by the network device, wherein the first indication information is used to indicate the TDD frame structure corresponding to the wavelength of the terminal in the cell, and there are multiple TDD frame structures in the cell.

[0115] According to a fifth aspect of the embodiments of this disclosure, a network device is provided, comprising:

[0116] One or more processors;

[0117] The network device is used to perform the communication method described in any one of the first aspects.

[0118] According to a sixth aspect of the embodiments of this disclosure, a terminal is provided, comprising:

[0119] One or more processors;

[0120] The terminal is used to execute the communication method described in any of the second aspects.

[0121] According to a seventh aspect of the present disclosure, a communication system is provided, including a terminal and a network device, wherein the network device is configured to implement the communication method according to any one of the first aspects, and the terminal is configured to implement the communication method according to any one of the second aspects.

[0122] According to an eighth aspect of the present disclosure, a storage medium is provided that stores instructions that, when executed on a communication device, cause the communication device to perform a communication method as described in either the first or second aspect.

[0123] This disclosure provides a communication method. In some embodiments, the terms "communication method" and "information processing method" can be used interchangeably, as can the terms "communication method apparatus" and "information processing apparatus" and "communication apparatus," and the terms "information processing system" and "communication system."

[0124] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0125] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0126] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0127] In this disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular or a plural expression.

[0128] In the embodiments disclosed herein, "multiple" refers to two or more.

[0129] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0130] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (execute A regardless of B); in some embodiments, B (execute B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, both A and B are executed. The same applies when there are more branches such as A, B, C, etc.

[0131] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execution of A regardless of B); in some embodiments, B (execution of B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, C, etc.

[0132] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0133] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0134] In some embodiments, the terms “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “if…”, “if…”, etc., can be used interchangeably.

[0135] In some embodiments, the terms “greater than”, “greater than or equal to”, “not less than”, “more than”, “more than or equal to”, “not less than”, “higher than”, “higher than or equal to”, “not lower than”, and “above” can be used interchangeably, as can the terms “less than”, “less than or equal to”, “not greater than”, “less than”, “less than or equal to”, “not more than”, “lower than”, “lower than or equal to”, “not higher than”, and “below”.

[0136] In some embodiments, the apparatus and device may be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they may also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "body", etc.

[0137] In some embodiments, "network" can be interpreted as devices included in the network, such as access network devices, core network devices, etc.

[0138] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)," "base station (BS)," "radio base station," or "fixed station." In some embodiments, it may also be understood as "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "serving cell," "carrier," "component carrier," or "bandwidth part (BWP)."

[0139] In some embodiments, "terminal" or "terminal device" may be referred to as "user equipment (UE)," "user terminal," "mobile station (MS)," "mobile terminal (MT)," "subscriber station," "mobile unit," "subscriber unit," "wireless unit," "remote unit," "mobile device," "wireless device," "wireless communication device," "remote device," "mobile subscriber station," "access terminal," "mobile terminal," "wireless terminal," "remote terminal," "handset," "user agent," "mobile client," "client," etc.

[0140] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0141] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0142] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0143] The embodiments involve related concepts. For ease of understanding, the related concepts will be explained and described below:

[0144] In some embodiments, the base TDD frame structure may refer to a TDD frame structure that can serve as a basis. This base TDD frame structure may be a pre-set TDD frame structure, which may determine whether other TDD frame structures have frame header offsets.

[0145] In some embodiments, a header-offset TDD frame structure can be used, for example, to indicate a TDD frame structure that has a header offset value from the base TDD frame structure.

[0146] In some embodiments, the far-point round-trip time (RTT) is the maximum RTT in the set of round-trip time (RTTs), which includes the RTTs between network devices and terminals in the terminal set.

[0147] In some embodiments, a beam snapshot is used to indicate a list of beams covered by a satellite at a certain time, specifically including, for example, the mapping relationship between beams at a certain time and TDD frame structure.

[0148] Figure 1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure. As shown in Figure 1, the communication system 100 includes a terminal 101 and a network device 102.

[0149] In some embodiments, terminal 101 includes, but is not limited to, at least one of the following: mobile phone, wearable device, Internet of Things device, car with communication function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home.

[0150] In some embodiments, network device 102 may include at least one of access network device and core network device.

[0151] In some embodiments, the access network device is, for example, a node or device that connects a terminal to a wireless network. The access network device may include, but is not limited to, at least one of the following in a 5G communication system: an evolved NodeB (eNB), a next-generation eNB (ng-eNB), a next-generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved node B (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6th generation mobile networks (6G) communication system, an open RAN, a cloud RAN, a base station in other communication systems, an access node in a Wi-Fi system, or a node such as a drone or satellite in a non-terrestrial communication network.

[0152] In some embodiments, the technical solutions of this disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within access network devices involved in the embodiments of this disclosure can be transformed into internal interfaces of Open RAN. The processes and information interactions between these internal interfaces can be implemented by software or programs.

[0153] In some embodiments, the access network device may be composed of a central unit (CU) and a distributed unit (DU). The CU may also be called a control unit. The CU-DU structure can separate the protocol layer of the access network device. Some of the protocol layer functions are centrally controlled by the CU, while the remaining part or all of the protocol layer functions are distributed in the DU and centrally controlled by the CU. However, this is not the only possibility.

[0154] In some embodiments, a core network device may be a single device comprising one or more network elements, or it may be multiple devices or a group of devices, each comprising all or part of the aforementioned one or more network elements. Network elements may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), or a Next Generation Core (NGC).

[0155] In some embodiments, the core network equipment can be a single device, including a first network element, a second network element, etc., or it can be multiple devices or a group of devices, each including all or part of the first network element, the second network element, etc. Network elements can be virtual or physical. The core network includes, for example, at least one of the Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).

[0156] In some embodiments, the first network element is, for example, the Access and Mobility Management Function (AMF).

[0157] In some embodiments, the first network element is used to "be responsible for functions such as terminal authentication, authorization, registration, mobility management and connection management", and the name is not limited thereto.

[0158] In some embodiments, the second network element is, for example, a Session Management Function (SMF).

[0159] In some embodiments, the second network element is used to "be responsible for interacting with the decoupled data plane, creating, updating and deleting Protocol Data Unit (PDU) sessions, and managing the session context of the User Plane Function (UPF)," and the name is not limited thereto.

[0160] In some embodiments, the third network element is, for example, a User Plane Function (UPF).

[0161] In some embodiments, the third network element is used to "implement user plane services of 5G networks, including but not limited to: air interface, routing, QoS (Quality of Service) and network architecture security", and the name is not limited thereto.

[0162] In some embodiments, the third network element can be independent of the core network equipment.

[0163] In some embodiments, the third network element may be part of the core network equipment.

[0164] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions proposed in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions proposed in this disclosure are also applicable to similar technical problems.

[0165] The following embodiments of this disclosure can be applied to the communication system 100 shown in FIG1, or to some of the main bodies, but are not limited thereto. The main bodies shown in FIG1 are illustrative. The communication system may include all or some of the main bodies in FIG1, or may include other main bodies outside of FIG1. ​​The number and form of each main body are arbitrary. Each main body may be physical or virtual. The connection relationship between the main bodies is illustrative. The main bodies may not be connected or may be connected. The connection can be in any way, it can be a direct connection or an indirect connection, it can be a wired connection or a wireless connection.

[0166] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0167] In some embodiments, non-terrestrial networks (NTNs) can be one of the enabling technologies for generation mobile networks systems. The added value that NTN components bring to terrestrial system architectures has also been recognized by the 3rd Generation Partnership Project (3GPP).

[0168] In some implementations, low-Earth orbit (LEO) satellite systems generally employ Frequency Division Duplex (FDD) architecture. Considering the scarcity of available spectrum resources in FDD systems (especially in the spectrum range below 6 GHz) and the low spectrum utilization caused by asymmetric uplink and downlink services, which are the mainstream service types, in FDD systems, the current research objective is to explore how to adopt TDD (Transient Data Difference) networking in LEO satellite systems. When the 5G non-terrestrial network (NTN) TDD standard is applied to LEO satellite communication systems, given the large signal propagation distance between the satellite and ground user equipment (UE), the round-trip delay is typically several milliseconds or tens of milliseconds. This results in a guard interval of several milliseconds required for the conversion between downlink (DL) and uplink (UL) time slots, leading to relatively low utilization of air interface time slot resources for the entire system.

[0169] The following describes in detail a communication method, apparatus, device, and storage medium provided in the embodiments of this disclosure with reference to the accompanying drawings.

[0170] Figure 2 is an interactive schematic diagram of a communication method provided in an embodiment of this disclosure. As shown in Figure 2, the method may include the following steps:

[0171] Step S2101: The network device obtains the TDD frame structure corresponding to any wave position in the cell, wherein there are multiple TDD frame structures in the cell.

[0172] In one embodiment of this disclosure, the implementing entity may be a network device, and 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.

[0173] 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.

[0174] In one embodiment of this disclosure, any wave position in a cell may refer to any wave position in the same cell, specifically, any wave position in a cell that is identified as the same cell.

[0175] In one embodiment of this disclosure, multiple TDD frame structures may correspond to at least two TDD frame structures. These multiple TDD frame structures may include several different TDD frame structures. The name of the TDD frame structure does not specifically refer to a particular fixed frame structure. A TDD frame structure may also be referred to as a frame structure. Different TDD frame structures may, for example, have different frame header offset values.

[0176] In one embodiment of this disclosure, at least one wavelength of a cell may be sent from a ground control center to the network device.

[0177] In one embodiment of this disclosure, obtaining the TDD frame structure corresponding to any wave position in a cell includes at least one of the following:

[0178] The TDD frame structure corresponding to any spectral position in the cell is obtained through dynamic configuration.

[0179] The TDD frame structure corresponding to any spectral position in the cell is obtained through static pre-configuration.

[0180] The TDD frame structure corresponding to any spectral position in the cell is obtained through a semi-static configuration method.

[0181] In one embodiment of this disclosure, the TDD frame structure corresponding to any wavelength position in a cell can be obtained through dynamic configuration.

[0182] In one embodiment of this disclosure, the TDD frame structure corresponding to any wavelength position in a cell can be obtained by static pre-configuration.

[0183] In one embodiment of this disclosure, the TDD frame structure corresponding to any wavelength position in a cell can be obtained through a semi-static configuration method.

[0184] For example, in one embodiment of this disclosure, a wave position can be used to indicate the beam coverage location or the beam center location. The beam can, for example, indicate the direction and range of propagation of emitted radio waves in space, used for transmitting and receiving signals. The at least one wave position corresponding to a cell can specifically refer to a fixed wave position or may not specifically refer to a particular fixed wave position. For example, when the cell changes, the at least one wave position corresponding to that cell can also change accordingly. For example, when the wave position information changes or the wave position allocation method for that cell changes, the at least one wave position corresponding to that cell can also change accordingly.

[0185] In one embodiment of this disclosure, there is a mapping relationship between wave positions and TDD frame structures. Different wave positions can correspond to different TDD frame structures, and different wave positions can also correspond to the same TDD frame structure. Terminals within any given wave position use the exact same TDD frame structure; that is, multiple terminals within the same wave position all use the TDD frame structure corresponding to that wave position.

[0186] According to some embodiments, dynamic configuration can be used, for example, to indicate that the mapping relationship between waveforms and frame structures can be dynamically configured by the network device according to preset criteria. These preset criteria could, for example, be a balance of the number of active users using different frame structures.

[0187] According to some embodiments, static pre-configuration can be used, for example, to indicate that the mapping relationship between waveforms and frame structure can be determined by the ground control center according to some criteria and will not be changed. This mapping relationship is then transmitted to each network device by the ground control center via the power supply link. Some criteria may include, for example, a heat map of the service and a given geographical isolation strategy for interference avoidance.

[0188] According to some embodiments, semi-static configuration can, for example, add a degree of flexibility to the aforementioned static pre-configuration. Specifically, the ground control center can adjust existing mapping relationships at a larger time granularity (e.g., hours, days, months) based on changes in service heat distribution. This adjustment can be determined by the ground control center and then injected into each network device via the power supply link. To avoid the impact of frame structure adjustments on users in a particular wavelength range, adjustments should be made after all terminal services in that wavelength range have ended. The specific adjustment strategy and timing can be decided by the control center.

[0189] According to some embodiments, the mapping between radii and frame structures for satellites can be accomplished based on a unified configuration uploaded by the ground control center. In other words, each satellite uses the same frame structure for signal transmission and reception for the same radii. Specifically, for any TDD radii on the ground, after the ground control center uploads a pre-configuration or semi-static adjustment configuration for the frame structure used for that radii, the same frame structure is always used regardless of which satellite serves that radii. This implementation reduces the complexity of cell handover for terminals.

[0190] In some embodiments, the multiple TDD frame structures include a first TDD frame structure and a second TDD frame structure. The first time slot occupied by the first transmission link in the first TDD frame structure corresponds to the first guard interval in the second TDD frame structure, and the second time slot occupied by the second transmission link in the second TDD frame structure corresponds to the second guard interval in the first TDD frame structure.

[0191] In some embodiments, the first and second in the embodiments of this disclosure are used to distinguish different descriptive objects. For example, the first TDD frame structure and the second TDD frame structure are used to distinguish different TDD frame structures.

[0192] In some embodiments, the second TDD frame structure has a frame header offset value compared to the first TDD frame structure. The name for this frame header offset value is not limited; for example, it can also be called the frame offset length.

[0193] In some embodiments, the first TDD frame structure is a basic TDD frame structure, and the second TDD frame structure is a frame header offset version of the TDD frame structure, or the first TDD frame structure is a frame header offset version of the TDD frame structure, and the second TDD frame structure is a basic TDD frame structure.

[0194] In some embodiments, the frame header offset value is the length of the first guard interval or the length of the second guard interval.

[0195] The basic TDD frame structure and the frame header offset version of the TDD frame structure are the same. That is, the two frame structures configured in each cell have the same frame period and uplink / downlink time slot ratio, and the frame offset length is equal to the GP length. In other words, the frame header offset value between the two frame structures configured in each cell is equal to the GP length.

[0196] The basic TDD frame structure can refer to a TDD frame structure that can serve as a basis. This basic TDD frame structure can be a pre-set TDD frame structure, which can determine whether other TDD frame structures have frame header offsets.

[0197] In one embodiment of this disclosure, Figure 3A illustrates two example schematic diagrams of frame structures. The first TDD frame structure can be, for example, frame structure 1, and the second TDD frame structure can be, for example, frame structure 2. The time slots occupied by the uplink and downlink in frame structure 1 correspond to the guard interval in frame structure 2, and the time slots occupied by the uplink and downlink in frame structure 2 correspond to the guard interval in frame structure 1. The basic TDD frame structure can be, for example, frame structure 1, and the header-offset TDD frame structure can be, for example, frame structure 2.

[0198] In one embodiment of this disclosure, Figure 3B illustrates an example of single-cell service spectrum classification. All TDD spectrum services within a single cell can be classified based on one or more combinations of geographical location and traffic volume. For example, all terminals on one spectrum may use frame structure 1, while all terminals on another spectrum may use frame structure 2. The use of frame structure 1 can, for example, indicate that the terminal uses frame structure 1 for communication.

[0199] According to some embodiments, as shown in Figure 3B, from the perspective of network devices, in the case of shared antenna resources, a single channel can be fully utilized in all time slots, which can improve the utilization rate of air interface time slot resources.

[0200] In some embodiments, both the first guard interval and the second guard interval are greater than the far-point round-trip time (RTT). The far-point RTT is the maximum RTT in the set of RTTs, which includes the RTTs between network devices and terminals in the terminal set. In both frame structures, the guard interval is sufficiently large to ensure it is greater than the far-point RTT, effectively preventing co-channel interference between uplink transmissions by terminals within the same user group and downlink receptions by adjacent terminals. Furthermore, interference between user groups caused by different frame structures can be mitigated through geographical isolation, frequency division configuration, etc. Specific interference mitigation methods are described below.

[0201] In some embodiments, the method further includes:

[0202] Based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT, the frame period corresponding to any TDD frame structure among various TDD frame structures is determined. The far-point RTT can be the maximum RTT in the RTT set. The RTT set includes the RTT between network devices and terminals in the terminal set.

[0203] In some embodiments, the method further includes:

[0204] Based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT, the uplink and downlink time slot ratio corresponding to any TDD frame structure among various TDD frame structures is determined. The far-point RTT can be the maximum RTT in the RTT set. The RTT set includes the RTT between network devices and terminals in the terminal set.

[0205] In some embodiments, the uplink / downlink time slot ratio is the ratio of downlink time slots, F-time slots, and uplink time slots, where the number of F-time slots accounts for half of the number of time slots corresponding to a frame period. The F-time slot can also be referred to as the S-time slot, for example.

[0206] According to some embodiments, from the terminal's perspective, a terminal located at a certain wavelength can obtain complete uplink and downlink service time slots under a certain frame structure. For example, when the maximum RTT is less than 10ms, a single cell supporting two frame structures requires a larger GP (GP) to avoid uplink and downlink co-channel interference between the two frame structures compared to a single frame structure, which can reduce the user's maximum transmission rate to some extent.

[0207] In one embodiment of this disclosure, different far-point RTTs can correspond to different frame periods and uplink / downlink time slot ratios.

[0208] In some embodiments, where the far-point round-trip time (RTT) is greater than a first threshold but less than a second threshold, the protection interval can be a value determined by rounding up the far-point RTT.

[0209] In some embodiments, the far-point round-trip time (RTT) is greater than a first threshold but less than a second threshold, the guard interval is the second threshold, the frame period corresponding to the first TDD frame structure and the second TDD frame structure is twice the second threshold, and the second threshold is greater than the first threshold.

[0210] According to some embodiments, the second of the first and second thresholds in the first threshold is used to distinguish different thresholds and does not specifically refer to a certain fixed threshold.

[0211] In some embodiments, for example, the time slots included in the frame period corresponding to each frame structure can be determined based on the subcarrier spacing (SCS).

[0212] In some embodiments, the subcarrier spacing (SCS) is 30 kHz, and the frame period corresponding to the first TDD frame structure and the second TDD frame structure can be, for example, 20 ms. Each frame period of the first TDD frame structure and the second TDD frame structure includes 40 time slots. The 20 ms can be configured, for example, with a 10 ms dual-period configuration.

[0213] In some embodiments, the first threshold is 5 milliseconds and the second threshold is 10 milliseconds. The GP length can be, for example, 10 ms, and the frame period can be, for example, 20 ms. Choosing the second threshold of 10 ms can reduce the software modifications introduced during timing arrangement, thereby reducing the implementation difficulty and cost of the technical solution.

[0214] In some embodiments, the uplink / downlink time slot ratio corresponding to the 40 time slots is the ratio of downlink time slots, F time slots, and uplink time slots. The uplink / downlink time slot ratio may include at least one of 12:20:8 and 10:20:10. This uplink / downlink time slot ratio may also be other values, which are not limited in this disclosure.

[0215] According to some embodiments, the lengths of the DL time slot and the UL time slot can be equal to the length of the guard interval, that is, the length of the guard interval is equal to half of the frame period.

[0216] In this case, the time slot with a subcarrier spacing of 30kHz is 0.5ms. The time slots included in a 10ms period can be, for example, 20, and the time slots included in a 10ms double period can be, for example, 40.

[0217] In some embodiments, the far-point round-trip time (RTT) is less than a first threshold, the guard interval is the first threshold, and the frame period corresponding to the first TDD frame structure and the second TDD frame structure is twice the first threshold.

[0218] In some embodiments, the subcarrier spacing (SCS) is 30 kHz, and the frame period corresponding to the first TDD frame structure and the second TDD frame structure both include 20 time slots.

[0219] In some embodiments, the first threshold is 5 milliseconds.

[0220] In some embodiments, the uplink / downlink time slot ratio corresponding to the 20 time slots is the ratio of downlink time slot, F time slot, and uplink time slot. This uplink / downlink time slot ratio may include at least one of 6:10:4 and 5:10:5. However, this uplink / downlink time slot ratio may also be other values, which are not limited in this embodiment.

[0221] In some embodiments, where the far-point round-trip time (RTT) is less than a first threshold, the guard interval can be a value determined by rounding up the far-point RTT.

[0222] According to some embodiments, as the number of satellites in the constellation further increases, the coverage area of ​​a single satellite further decreases. When the apogee RTT is less than 5ms, the frame period and uplink / downlink time slot ratio can be configured as follows:

[0223] When the far-point RTT is slightly less than 5ms, the GP length needs to be greater than or equal to 5ms. Based on the above, the GP length can be configured to 5ms, making the frame period equal to 10ms.

[0224] In one embodiment of this disclosure, the granularity of the uplink / downlink configuration can be, for example, at the time slot level. In the 3GPP protocol, New Radio (NR) TDD defines the time slot configuration for each pattern using patterns 1 and 2 in the TDD-UL-DL-ConfigCommon cell. In some embodiments, only pattern 1 (i.e., only one pattern) needs to be used; to configure a frame period greater than 10ms, both pattern 1 and pattern 2 need to be used. More specifically, the specific time slot configuration within a single pattern is defined using the TDD-UL-DL-Pattern cell.

[0225] The parameters included in the TDD-UL-DL-Pattern are explained as follows:

[0226] dl-UL-TransmissionPeriodicity: The period of DL-UL transmission mode (pattern1 or pattern2);

[0227] nrofDownlinkSlots: The number of time slots occupied by DL at the beginning of the entire dl-UL-TransmissionPeriodicity;

[0228] nrofDownlinkSymbols: How many symbols the DL occupies after the last complete DL slot;

[0229] nrofUplinkSlots: The number of time slots occupied by UL at the end of the entire dl-UL-TransmissionPeriodicity;

[0230] nrofUplinkSymbols: Within the entire dl-UL-Transmission Period, how many symbols are occupied by UL before the first complete UL time slot. This parameter specifies the time length occupied by uplink and downlink transmissions in a TDD cell, with granularity down to the OFDM symbol level. The frame period and uplink / downlink time slot ratio can use parameters from the protocol; for example, the uplink / downlink time slot ratio under different frame periods can be shown in Table 1.

[0231] Table 1

[0232] In some embodiments, at least one reserved symbol is present in the first TDD frame structure or the second TDD frame structure among multiple TDD frame structures. The at least one reserved symbol is used for antenna switching delay from downlink to uplink reception when switching from downlink time slot of the first TDD frame structure to uplink time slot of the second TDD frame structure.

[0233] In conjunction with some embodiments of the first aspect, in some embodiments, the antenna switching delay is two Orthogonal Frequency Division Multiplexing (OFDM) symbols. The antenna switching delay may, for example, be two OFDM symbols reserved in the last downlink time slot.

[0234] In some embodiments, when SCS = 30kHz, the uplink / downlink time slot ratio in a 20ms frame period can be, for example, 12:20:8. When this uplink / downlink time slot ratio is transmitted via the TDD-UL-DL-Pattern, the meanings of the parameters included in the TDD-UL-DL-Pattern are as follows:

[0235] dl-UL-TransmissionPeriodicity: The period for DL-UL transmission mode pattern 1 is 10ms;

[0236] nrofDownlinkSlots: At the beginning of the entire dl-UL-Transmission Periodicity, the number of time slots occupied by DL in the period of pattern1 is 11;

[0237] nrofDownlinkSymbols: After the last complete DL slot, DL occupies 12 symbols in the period of pattern1;

[0238] nrofUplinkSlots: At the end of the entire dl-UL-TransmissionPeriodicity, the number of time slots occupied by UL in the period of pattern1 is 0;

[0239] nrofUplinkSymbols: Within the entire dl-UL-Transmission Period, before the first complete UL slot, UL occupies 0 symbols in the period of pattern1;

[0240] dl-UL-TransmissionPeriodicity: The period for DL-UL transmission mode pattern 2 is 10ms;

[0241] nrofDownlinkSlots: At the beginning of the entire dl-UL-Transmission Periodicity, the number of time slots occupied by DL in the period of pattern2 is 0;

[0242] nrofDownlinkSymbols: After the last complete DL slot, DL occupies 0 symbols in the period of pattern1;

[0243] nrofUplinkSlots: At the end of the entire dl-UL-TransmissionPeriodicity, the number of time slots occupied by UL in the period of pattern2 is 8;

[0244] nrofUplinkSymbols: Within the entire dl-UL-Transmission Periodicity, before the first complete UL slot, UL occupies 0 symbols in the period of pattern2;

[0245] The subcarrier spacing (SCS) is 30 kHz. The frame periods corresponding to the first and second TDD frame structures each include 40 time slots. At the beginning of the entire dl-UL-Transmission Period, the number of time slots occupied by DL in the period of pattern 1 is 11. After the last complete DL time slot, DL occupies 12 symbols in the period of pattern 1. Since the antenna switching delay from downlink to uplink reception reserves two symbol-level GPs in the last downlink time slot, the number of time slots occupied by DL in the period of pattern 1 is 12, and the number of remaining time slots in the period of pattern 1 is 8. The number of time slots occupied by UL in the period of pattern 2 is 8, and the number of remaining time slots in the period of pattern 2 is 12. Therefore, the number of flexible time slots is the sum of the number of remaining time slots in the period of pattern 1 and the number of remaining time slots in the period of pattern 2, which is 20.

[0246] In some embodiments, when SCS = 30kHz, the uplink / downlink time slot ratio in a 20ms frame period can be, for example, 10:20:10. When this uplink / downlink time slot ratio is transmitted via the TDD-UL-DL-Pattern cell, the meanings of the parameters included in the TDD-UL-DL-Pattern cell are as follows:

[0247] dl-UL-TransmissionPeriodicity: The period for DL-UL transmission mode pattern 1 is 10ms;

[0248] nrofDownlinkSlots: At the beginning of the entire dl-UL-Transmission Periodicity, the number of time slots occupied by DL in the period of pattern1 is 9;

[0249] nrofDownlinkSymbols: After the last complete DL slot, DL occupies 12 symbols in the period of pattern1;

[0250] nrofUplinkSlots: At the end of the entire dl-UL-TransmissionPeriodicity, the number of time slots occupied by UL in the period of pattern1 is 0;

[0251] nrofUplinkSymbols: Within the entire dl-UL-Transmission Period, before the first complete UL slot, UL occupies 0 symbols in the period of pattern1;

[0252] dl-UL-TransmissionPeriodicity: The period for DL-UL transmission mode pattern 2 is 10ms;

[0253] nrofDownlinkSlots: At the beginning of the entire dl-UL-Transmission Periodicity, the number of time slots occupied by DL in the period of pattern2 is 0;

[0254] nrofDownlinkSymbols: After the last complete DL slot, DL occupies 0 symbols in the period of pattern1;

[0255] nrofUplinkSlots: At the end of the entire dl-UL-TransmissionPeriodicity, the number of time slots occupied by UL in the period of pattern2 is 10;

[0256] nrofUplinkSymbols: Within the entire dl-UL-Transmission Periodicity, before the first complete UL slot, UL occupies 0 symbols in the period of pattern2;

[0257] The subcarrier spacing (SCS) is 30 kHz. The frame periods corresponding to the first and second TDD frame structures each include 40 time slots. At the beginning of the entire dl-UL-Transmission Period, the number of time slots occupied by DL in the period of pattern 1 is 9. After the last complete DL time slot, DL occupies 12 symbols in the period of pattern 1. Since the antenna switching delay from downlink to uplink reception reserves two symbol-level GPs in the last downlink time slot, the number of time slots occupied by DL in the period of pattern 1 is 10, and the number of remaining time slots in the period of pattern 1 is 10. The number of time slots occupied by UL in the period of pattern 2 is 10, and the number of remaining time slots in the period of pattern 2 is 10. Therefore, the number of flexible time slots is the sum of the number of remaining time slots in the period of pattern 1 and the number of remaining time slots in the period of pattern 2, which is 20.

[0258] In some embodiments, when SCS = 30kHz, the uplink / downlink time slot ratio in a 10ms frame period can be, for example, 6:10:4. When this uplink / downlink time slot ratio is transmitted via the TDD-UL-DL-Pattern cell, the meanings of the parameters included in the TDD-UL-DL-Pattern cell are as follows:

[0259] dl-UL-TransmissionPeriodicity: The period for DL-UL transmission mode pattern 1 is 10ms;

[0260] nrofDownlinkSlots: At the beginning of the entire dl-UL-Transmission Periodicity, the number of time slots occupied by DL in the period of pattern1 is 5;

[0261] nrofDownlinkSymbols: After the last complete DL slot, DL occupies 12 symbols in the period of pattern1;

[0262] nrofUplinkSlots: At the end of the entire dl-UL-TransmissionPeriodicity, the number of time slots occupied by UL in the period of pattern1 is 4;

[0263] nrofUplinkSymbols: Within the entire dl-UL-Transmission Period, before the first complete UL slot, UL occupies 0 symbols in the period of pattern1;

[0264] The subcarrier spacing (SCS) is 30 kHz. The frame periods corresponding to the first and second TDD frame structures each include 20 time slots. At the beginning of the entire dl-UL-Transmission Period, DL occupies 5 time slots in the period of pattern 1. After the last complete DL time slot, DL occupies 12 symbols in the period of pattern 1. Since the antenna switching delay from downlink to uplink reception reserves two symbol-level GPs in the last downlink time slot, and UL occupies 4 time slots in the period of pattern 1 at the end of the entire dl-UL-Transmission Period, the remaining time slots in the period of pattern 1 are 10, and the number of flexible time slots is 10.

[0265] In some embodiments, when SCS = 30kHz, the uplink / downlink time slot ratio in a 10ms frame period can be, for example, 5:10:5. When this uplink / downlink time slot ratio is transmitted via the TDD-UL-DL-Pattern cell, the meanings of the parameters included in the TDD-UL-DL-Pattern cell are as follows:

[0266] dl-UL-TransmissionPeriodicity: The period for DL-UL transmission mode pattern 1 is 10ms;

[0267] nrofDownlinkSlots: At the beginning of the entire dl-UL-Transmission Periodicity, the number of time slots occupied by DL in the period of pattern1 is 4;

[0268] nrofDownlinkSymbols: After the last complete DL slot, DL occupies 12 symbols in the period of pattern1;

[0269] nrofUplinkSlots: At the end of the entire dl-UL-TransmissionPeriodicity, the number of time slots occupied by UL in the period of pattern1 is 5;

[0270] nrofUplinkSymbols: Within the entire dl-UL-Transmission Period, before the first complete UL slot, UL occupies 0 symbols in the period of pattern1;

[0271] The subcarrier spacing (SCS) is 30 kHz. The frame periods corresponding to the first and second TDD frame structures each include 20 time slots. At the beginning of the entire dl-UL-Transmission Period, DL occupies 4 time slots in the period of pattern 1. After the last complete DL time slot, DL occupies 12 symbols in the period of pattern 1. Since the antenna switching delay from downlink to uplink reception reserves two symbol-level GPs in the last downlink time slot, and UL occupies 5 time slots in the period of pattern 1 at the end of the entire dl-UL-Transmission Period, the remaining time slots in the period of pattern 1 are 10, and the number of flexible time slots is 10.

[0272] According to some embodiments, the method further includes:

[0273] The uplink and downlink time slot ratio is adjusted based on at least one of the following: constellation configuration, far-point RTT, and antenna switching delay.

[0274] For example, in one embodiment of this disclosure, TDD has a very low proportion of downlink resources in each frame period due to the excessively large guard interval. Taking the uplink / downlink time slot ratio of 12:20:8 as an example, the downlink time slot proportion is only 30% of that in the FDD system. According to some embodiments with a signaling proportion of 15%, it can only support the transmission of 1 to 3 SSB blocks within each 20ms (i.e., each typical SSB transmission cycle).

[0275] If the TDD standard allows terminals to directly access the network, the access cycle for idle terminals to access the TDD standard can be determined based on the number of SSBs that can be transmitted every 20ms, the number of spectral bits that a single TDD satellite can provide access services, and the number of beams that can simultaneously transmit the same SSB block (to avoid "antenna power amplifier over-transmission," the number of beams simultaneously transmitting the same SSB block is limited. Taking one concurrent beam data as an example, the access cycle for idle terminals to access the TDD standard can be determined by the SSB return visit duration. The return visit duration can also be called the return visit time or return visit cycle, and it does not refer to a specific fixed duration. This return visit duration can be determined based on multiple factors.

[0276] In some embodiments, the method further includes:

[0277] The TDD frame structure for any spectral position is adjusted based on the revisit duration of each SSB. Each SSB maintains frame synchronization with its corresponding TDD frame structure.

[0278] In some embodiments, the revisit duration of each SSB is determined based on beam information, which includes the number of beams, the number of SSB blocks that can be transmitted within each SSB period, and the maximum number of concurrent beams N supported by the on-board antenna. antenna The number N of beams capable of simultaneously transmitting the same SSB block s The number of wavelengths N that a single satellite needs to provide access services under the TDD standard. beam .

[0279] According to some embodiments, each SSB cycle T can be defined. SSB The number of SSB blocks that can be sent is N. SSB The maximum number of concurrent beams supported by the on-board antenna is N. antenna The number of beams capable of simultaneously transmitting the same SSB block is N. s (N s ≤N antenna In TDD mode, the number of spectral bits that a single satellite needs to provide access services is N. beam The SSB's return visit duration can be represented as shown in formula (1):

[0280] As can be seen from the above formula, the SSB's return visit duration is directly proportional to the number of wavelengths that a single TDD satellite can provide access services.

[0281] Among them, the SSB's return visit duration needs to be less than the preset return visit duration. This determines the maximum limit of the number of wavelengths that a single TDD satellite can provide access services for in the system design, which can reduce the terminal's access time and improve the system's design performance.

[0282] According to some embodiments, if staring beam transmission is used, N beam It will also be limited by the maximum number of concurrent beams N supported by the antenna array. antenna Under each typical uplink / downlink time slot configuration, the timing arrangement of SSB and system messages can be specifically configured based on the "number of wavelengths served by a single TDD satellite".

[0283] According to some embodiments, since the service coverage area of ​​a single satellite is several million square kilometers, and the diameter of a single band position is approximately tens of kilometers, a single satellite needs to cover hundreds or thousands of band positions. Within the preset SSB revisit time, the limited number makes it difficult to achieve thousands of band positions; that is, implementing full coverage of all band positions under a single satellite is quite challenging in a practical system. Therefore, low-Earth orbit satellite communication systems can adopt a multi-layered design. The TDD constellation network layer can serve as a capacity enhancement layer in this multi-layered constellation design, providing capacity enhancement for local hotspots. The selection of hotspot band positions can be based on the traffic volume of other constellation layers, such as the FDD constellation network layer which can provide comprehensive coverage.

[0284] In some embodiments, obtaining the TDD frame structure of each spectral position in at least one spectral position of a cell includes:

[0285] Obtain the position information of the wave position and the corresponding wave position traffic information in the wave position snapshot n under the TDD system, where n is a positive integer and the initial value of n is 1;

[0286] Based on the beam traffic information, obtain the beam position set, which includes the beam position with the largest traffic, representing the maximum number of beam positions served by a single TDD satellite.

[0287] The geographical locations of each wavelength position are clustered to obtain the total traffic volume of each wavelength position cluster in at least one wavelength position cluster.

[0288] If the number of wavelengths in any wavelength cluster does not meet the first requirement, the TDD frame structure adopted by any wavelength cluster is classified according to the total service volume of various TDD frame structures, and a wavelength snapshot n is obtained.

[0289] If the processing capacity or duration threshold of any wavelet cluster is satisfied by the second requirement, the TDD frame structure of any wavelet in at least one wavelet of the cell is obtained. Therefore, considering engineering feasibility and ease of implementation, mapping wavelets to TDD frame structures can keep the total service volume of terminals using various TDD frame structures as balanced as possible, making the wavelet data corresponding to the grid relatively balanced, and improving communication efficiency.

[0290] According to some embodiments, the first requirement may be, for example, a requirement corresponding to the number of wavelets, such as whether the number of wavelets is greater than a wavelet number threshold. The "first" in this first requirement is used to distinguish it from the second requirement.

[0291] According to some embodiments, the second requirement may be used, for example, to indicate whether the waveform snapshot n meets the requirement of process termination. This second requirement may, for example, be that waveform snapshot n is the last waveform snapshot.

[0292] According to some embodiments, Figure 3D illustrates an example of a mapping relationship between wavelets and frame structure, where the initial value of n can be, for example, 1. Wavelet traffic volume information can be obtained, for example, through the service distribution across the entire satellite network coverage area.

[0293] In some embodiments, for example, N, which has the largest volume of traffic, can be selected based on the size of the traffic volume. beam N wave positions, of which N beam The maximum number of wavelengths that can be served by a single TDD satellite; if the number of wavelengths in wavelength snapshot n is less than N. beam If so, all positions are selected. A position snapshot can be used, for example, to indicate the list of positions covered by a satellite at a given time; specifically, it can include the mapping relationship between positions and TDD frame structures.

[0294] In some embodiments, the method further includes:

[0295] If the processing capacity or duration threshold of any wavelength cluster corresponding to the wavelength snapshot n does not meet the second requirement, the step of obtaining the wavelength position information and the corresponding wavelength traffic volume information in the wavelength snapshot n under the TDD system is re-executed.

[0296] According to some embodiments, for example, n = n + 1 can be updated, and the steps of obtaining the waveform position information and the corresponding waveform traffic information in the waveform snapshot n under TDD system can be re-executed.

[0297] In some embodiments, the method further includes:

[0298] If the number of wavelengths in any wavelength cluster meets the first requirement, then any wavelength cluster is isolated.

[0299] In some embodiments, the isolation process may also be referred to as geographical isolation process or cut-off geographical isolation process, and this disclosure does not limit this to specific embodiments.

[0300] In some embodiments, the method further includes:

[0301] If it is determined that there are wave positions in any wave position cluster that do not meet the wave position requirements, the wave positions that do not meet the wave position requirements are removed, and the wave positions that meet the wave position traffic volume selection criteria among the n wave positions are added to the wave position set. The wave position traffic volume selection criteria are the wave positions with the highest wave position traffic volume among the n wave positions excluding each other.

[0302] According to some embodiments, the first requirement may be, for example, that the number of wave positions is greater than half of the total number of wave positions. Therefore, it can be determined whether the number of wave positions in a wave position cluster is greater than half of the total number of wave positions; if so, the wave position cluster is isolated based on different isolation strategies, wherein if any wave positions need to be discarded, new wave positions are added to N. beam Each wave position.

[0303] In step S2102, the network device sends first indication information to the set of terminals included in any wavelength, wherein the first indication information is used to indicate the TDD frame structure;

[0304] In one embodiment of this disclosure, the terminal set includes at least one terminal, for example, a terminal that communicates with a network device and corresponds to the same cell. This terminal set does not specifically refer to a single fixed terminal. For example, the terminal set may change accordingly when the number of terminals in the set changes. Similarly, the terminal set may change accordingly when the identifier of any terminal in the set changes. Furthermore, the names of the terminals in the terminal set are not limited. For example, the terminal set may also be referred to as at least one terminal corresponding to any given wavelength.

[0305] In some embodiments, the terminal set may be a collection of at least one terminal. This terminal set does not specifically refer to a fixed set. For example, the terminal set may change when the number of terminals corresponding to it changes. Similarly, the terminal set may change when the identifier of any terminal in the set changes.

[0306] The first indication information can be used, for example, to indicate the TDD frame structure corresponding to any wavebit. The "first" in the first indication information is used to distinguish it from other indication information and does not specifically refer to any fixed indication information. For example, when the transmission time point corresponding to the first indication information changes, the first indication information can also change accordingly.

[0307] According to some embodiments, the first indication information includes the frame period corresponding to any TDD frame structure among a variety of TDD frame structures and the uplink / downlink time slot ratio corresponding to any TDD frame structure.

[0308] According to some embodiments, each TDD frame structure in a variety of TDD frame structures has the same frame period and uplink / downlink time slot ratio.

[0309] According to some embodiments, a 1-bit indicator can be added to the wavelet planning table injected by the ground control center into the satellite base station via the feeder link to indicate the TDD frame structure used for that wavelet, as shown below:

[0310] Wave position information:

[0311] Frame structure type (1 bit): 0 indicates that the user of this wavelength uses the basic TDD frame structure; 1 indicates that the user of this wavelength uses the offset frame structure.

[0312] In some embodiments, when multiple TDD frame structures exist in the same cell, no uplink or downlink conflicts occur on the network device side in any time slot. On the terminal side, no inter-terminal interference occurs between any two terminals in the terminal set using the same frame structure (or between any two users belonging to the same user group). However, for example, as shown in Figure 3C, when two frame structures exist in the same cell, the excessively large propagation distance of the satellite-to-ground link may cause a situation where one terminal in the terminal set using the basic TDD frame structure and another terminal in the terminal set using the frame header offset version of the TDD frame structure are receiving downlink while the other is transmitting uplink. If the two terminals are relatively close, "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 "user-side inter-group interference." This user-side inter-group interference can also be called inter-terminal interference, for example. In Figure 3C, the sub-satellite point can be used to indicate 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 the farthest point within the satellite's coverage area.

[0313] According to some embodiments, for example, at the boundary of different wavelength clusters, there may be inter-group interference between adjacent wavelengths of wavelength clusters with different frame structures on the user side.

[0314] According to some embodiments, the TDD standard serves as a network capacity layer for providing on-demand capacity expansion services to local areas. Within the coverage area of ​​a single satellite (hundreds or thousands of bandwidths), the specific bandwidth for service should be determined by information such as the service heat map obtained based on the FDD coverage layer, or the bandwidth where high-priority users are located at the current moment. This determines that the bandwidth required for service by a single satellite under the TDD standard has discreteness and randomness.

[0315] For example, geographical isolation can be used to avoid interference from user-side components. This can include:

[0316] Users are grouped based on wave positions, and users in any wave position use the exact same frame structure;

[0317] Based on geographical location, adjacent wavelengths should use the same frame structure as much as possible. That is, adjacent wavelengths form a wavelength cluster, and all wavelengths in each wavelength cluster use the same frame structure.

[0318] In special cases, when wave positions using different frame structures are inevitably adjacent, interference can be avoided by using sub-band frequency division or setting up geographical isolation zones between wave positions.

[0319] According to some embodiments, when the same cell includes two frame structures, the number of waveforms or traffic volume of the two frame structures can be kept balanced, thereby improving the resource utilization of network equipment.

[0320] In some embodiments, the method further includes:

[0321] If it is determined that there is inter-terminal interference between the first and second wave positions in the wave position cluster, obtain the interference type corresponding to the inter-terminal interference.

[0322] An interference avoidance strategy corresponding to the type of interference is adopted to adjust the interference between the first and second wave positions.

[0323] In some embodiments, the first and second waves before interference adjustment use different TDD frame structures and the distance between the first and second waves is less than a distance threshold.

[0324] The first and second wave positions can be adjacent wave positions, or wave positions whose edges are less than a geographic distance threshold. For example, they can also include neighboring wave positions that are adjacent across one or more wave positions.

[0325] According to some embodiments, in the service heat map, for example, there is a large continuous area with potential demand for increased capacity, and the number of wavelengths corresponding to this continuous area is greater than or equal to J (J equals the number of wavelengths N that can be served when only one frame structure is used in the cell). beam / 2, where N beam If the maximum number of wavelengths that can be served by a single TDD satellite is given, then this continuous area is divided into two wavelength clusters in the middle according to the principle of equal area or similar traffic volume. All wavelengths in one wavelength cluster use the basic TDD frame structure, and all wavelengths in the other wavelength cluster use the frame header offset version of the TDD frame structure.

[0326] In some embodiments, the interference type includes at least one of the following:

[0327] Inter-channel cross-link interference between terminals after initial random access is initiated;

[0328] Cross-link interference in the same channel between a terminal initiating initial random access and a terminal that has already initiated initial random access;

[0329] Cross-link interference in the same channel between a terminal transmitting uplink signals and a terminal receiving necessary downlink common signaling.

[0330] According to some embodiments, inter-terminal co-channel cross-link interference after initial random access can, for example, include interference to the reception of PDCCH / PDSCH / Channel State Information Reference Signal (CSI-RS) / Tracking Reference Signal (TRS) by a terminal using another frame structure when a terminal using a certain frame structure transmits the Physical Uplink Control Channel (PUCCH) / Physical Uplink Shared Channel (PUSCH).

[0331] According to some embodiments, cochannel cross-link interference between a terminal initiating initial random access and a terminal after initiating initial random access may include, for example, interference when a terminal using a certain frame structure sends PRACH (i.e., message Msg1 or MsgA) to the PDCCH / PDSCH / CSI-RS / TRS reception being performed by a terminal using another frame structure.

[0332] According to some embodiments, co-channel cross-link interference between a terminal transmitting uplink signals and a terminal receiving necessary downlink common signaling occurs because the downlink common signaling is broadcast to all terminals within the cell. Therefore, the terminal receiving the necessary downlink common signaling may be a terminal that initiated initial random access or a terminal that initiated initial random access. When designing interference avoidance strategies, if the strategy is effective, it will be effective for both the affected terminals that initiated initial random access and the affected terminals that initiated initial random access. "Necessary downlink common signaling" includes SSB and necessary Service Information Block (SIB) messages.

[0333] According to some embodiments, for "adjacent" spectral positions belonging to different spectral clusters that may have inter-group interference on the user side, "cut-off geographical isolation" can be directly adopted, that is, the use of TDD capacity layer is abandoned in the area on the geographical isolation zone.

[0334] In some embodiments, the interference between the first wave position and the second wave position is adjusted, including:

[0335] If the distance between terminals is determined to be less than the estimated distance threshold, the interference between the first and second wave positions is adjusted by using the width of the geographical isolation zone corresponding to the first and second wave positions. The distance threshold is determined based on the distance between terminals when the interference between terminals is ignored.

[0336] According to some embodiments, this distance threshold can be calculated, for example, based on a path loss determination method. For instance, when the path loss is greater than the path loss threshold, interference between terminals can be ignored when the distance between terminals is greater than the distance threshold.

[0337] According to some embodiments, taking the 6425-7125MHz frequency band (center frequency 6.775GHz) of 6G TDD as an example, the fading factor of the ground propagation environment is denoted as m (m = 2-4, typically 3.5-4 in urban areas, 2.5-3 in suburban areas, and 2 in very open areas such as sea level / grassland / desert); the terminal is considered as a high-power terminal (i.e., transmit power of 26dBm); the sensitivity of the terminal receiver is considered as typically -110dBm; based on the satellite-to-ground link budget results, the downlink service channel (i.e., the channel that the interfered terminal expects to receive normally) has almost no link margin available to offset additional inter-terminal co-channel cross-link interference under the current demodulation threshold configuration, so it can be assumed that no link margin is available.

[0338] Therefore, only when "path loss = 38.5 + 20log(6.775) + n × 10log(distance threshold)" is less than 26dBm - (-110dBm) = 136dB can the cross-link interference between terminals on the ground be ignored.

[0339] If we estimate based on the worst-case scenario corresponding to the decay factor of the propagation environment (i.e., taking n=2 in very open areas such as sea level / grassland / desert), the geographical threshold is approximately 11.07 kilometers.

[0340] If estimated based on the average situation corresponding to the decay factor of the propagation environment (i.e., n takes the median value n=3), the geographical threshold is approximately 497 meters;

[0341] If we estimate based on the best-case scenario corresponding to the decay factor of the propagation environment (i.e., n=4 in urban areas), the geographical threshold is approximately 105 meters.

[0342] Taking the 3600–3640 MHz frequency band (center frequency 3.62 GHz) as an example, using the same estimation method, the geographical threshold is estimated as follows:

[0343] If we estimate based on the worst-case scenario corresponding to the decay factor of the propagation environment (i.e., taking n=2 in very open areas such as sea level / grassland / desert), the geographical threshold is approximately 20.7 kilometers;

[0344] If estimated based on the average case of the decay factor corresponding to the propagation environment (i.e., n takes the median value n=3), the geographical threshold is approximately 755 meters;

[0345] If we estimate based on the best-case scenario corresponding to the decay factor of the propagation environment (i.e., n=4 in urban areas), the geographical threshold is approximately 144 meters.

[0346] In some embodiments, the method further includes:

[0347] The width of the geographical isolation zone is determined based on the geographical threshold corresponding to the terrain where at least one terminal is located.

[0348] According to some embodiments, if the center frequency of the TDD system is 6.775GHz, the operation and control center can set the width of the geographical isolation zone to 497 meters for areas in suburban areas that have capacity improvement needs, such as areas in the ocean that have capacity improvement needs, and set the width of the geographical isolation zone to 11.07 kilometers.

[0349] In some embodiments, the method further includes:

[0350] The system employs a timing broadcast SSB and system message corresponding to any TDD frame structure among various TDD frame structures. Within the system message, a first indication information is provided to the set of terminals included in any given TDD frame structure, specifying the frame period and uplink / downlink time slot ratio. Specifically, the first indication information may be, for example, the cell TDD-UL-DL-ConfigCommon.

[0351] According to some embodiments, when using a "wavelength-based grouping" user grouping criterion, in each frame period, the network device provides downlink and uplink transmission services to users "configured to use one or more wavelengths of the TDD frame structure" based on the timing corresponding to the TDD frame structure during a half-frame period; then, during the remaining half-frame period, it provides downlink and uplink transmission services to users "configured to use one or more wavelengths of the frame header offset frame structure" based on the timing corresponding to the frame header offset frame structure. For different frame structure configurations:

[0352] – In a spectral configuration that uses the basic TDD frame structure, network devices can broadcast SSBs and required system messages (such as SIB1) using timing corresponding to the basic TDD frame structure. The “configuration of frame period and the number of uplink and downlink time slots in each frame period” issued through the information cell tdd-UL-DL-configurationCommon in the SIB1 message is the corresponding configuration of the basic TDD frame structure. Any idle terminal initiating initial random access is also based on the timing corresponding to the basic TDD frame structure and the configuration of the random access RACH timing Occasion.

[0353] – In a waveform configured to use the frame header offset version frame structure, when a network device can broadcast SSB and required system messages (such as SIB1), it uses the timing corresponding to the frame header offset version frame structure. The "configuration of frame period and the number of uplink and downlink time slots in each frame period" issued through the information cell tdd-UL-DL-configurationCommon in the SIB1 message is the corresponding configuration of the frame header offset version TDD frame structure (that is, the corresponding configuration of the frame header offset version TDD frame structure). Any idle terminal initiating initial random access is also based on the timing corresponding to the frame header offset version frame structure and the RACH Occasion configuration.

[0354] According to some embodiments, network devices can send frame header offset values ​​to terminals via signaling messages. For example, for terminals using a basic TDD frame structure, the frame header offset is zero; for terminals using a frame header offset version of the TDD frame structure, the frame header offset value can be equal to the length of the protection interval after the protection interval configuration is determined. In this case, the terminal is unaware of the frame header offset.

[0355] Based on this implementation, in a wavelength configured to use the frame header offset version of the frame structure, the terminal is unaware of the frame header offset when transmitting and receiving signals for this wavelength.

[0356] According to some embodiments, when a terminal needs to transmit and receive signals towards adjacent wavelengths due to certain reasons (such as measurement, cell handover, etc.), the frame header offset value needs to be taken into account on the network device side so that the terminal is unaware of the frame header offset. For example, when a terminal using a frame header offset frame structure switches from TDD to FDD, a frame header offset exists, and this frame header offset value needs to be taken into account. In some possible embodiments, such as those shown in Figure 3E, the following may be included:

[0357] Obtain the frame structure and frame header offset value for any given spectral position, where the frame header offset value is the offset between the frame structure of any given spectral position and the basic TDD frame structure.

[0358] Based on the obtained information related to any wave position and the frame header offset value, the TDD frame structure of any wave position is adjusted to obtain the adjusted TDD frame structure.

[0359] Broadcast SSB and system messages, and send the adjusted TDD frame structure to the set of terminals corresponding to any spectral position via a second indication information in the system message. For example, relevant information may include the measurement window.

[0360] According to some embodiments, the second indication information may be used, for example, to transmit information about the adjusted TDD frame structure. The set of terminals corresponding to any given wavebit may, for example, include at least one terminal for transmitting and receiving signals for that wavebit. This set of terminals may include, for example, any included terminal and also terminals included in adjacent wavebits of that wavebit. This disclosure does not limit this aspect.

[0361] In step S2103, the terminal receives first indication information sent by the network device, wherein the first indication information is used to indicate the TDD frame structure corresponding to the wavelength of the terminal in the cell, and there are multiple TDD frame structures in the cell.

[0362] In one embodiment of this disclosure, the multiple TDD frame structures include a first TDD frame structure and a second TDD frame structure. The first time slot occupied by the first transmission link in the first TDD frame structure corresponds to the first guard interval in the second TDD frame structure, and the second time slot occupied by the second transmission link in the second TDD frame structure corresponds to the second guard interval in the first TDD frame structure.

[0363] In one embodiment of this disclosure, both the first protection interval and the second protection interval are greater than the far-point round-trip time (RTT). The far-point RTT is the maximum RTT in the RTT set, which includes the RTT between network devices and terminals in the terminal set.

[0364] In one embodiment of this disclosure, the second TDD frame structure has a frame header offset value from the first TDD frame structure.

[0365] In one embodiment of this disclosure, the first TDD frame structure is a basic TDD frame structure, and the second TDD frame structure is a frame header offset version of the TDD frame structure, or the first TDD frame structure is a frame header offset version of the TDD frame structure, and the second TDD frame structure is a basic TDD frame structure.

[0366] In one embodiment of this disclosure, the frame header offset value is the length of the first guard interval or the length of the second guard interval.

[0367] In one embodiment of this disclosure, the first indication information includes the frame period corresponding to any TDD frame structure among multiple TDD frame structures and the uplink / downlink time slot ratio corresponding to any TDD frame structure.

[0368] In one embodiment of this disclosure, each of the multiple TDD frame structures has the same frame period and uplink / downlink time slot ratio.

[0369] In one embodiment of this disclosure, the frame period corresponding to any TDD frame structure is determined by the network device based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT. The uplink / downlink time slot ratio corresponding to any TDD frame structure is determined by the network device based on the far-point RTT and the RTT range corresponding to the far-point RTT. The far-point RTT is the maximum RTT in the RTT set, and the RTT set includes the RTT between the network device and each terminal in the terminal set.

[0370] In one embodiment of this disclosure, the uplink / downlink time slot ratio is the ratio of downlink time slots, F time slots, and uplink time slots, wherein the number of F time slots accounts for half of the number of time slots corresponding to the frame period.

[0371] In one embodiment of this disclosure, the method further includes:

[0372] The system receives SSB and system messages broadcast by the network device. The system message includes second indication information, which is used to indicate the adjusted TDD frame structure corresponding to the wavelet. The adjusted TDD frame structure is obtained by the network device adjusting the TDD frame structure of the wavelet based on the obtained wavelet-related information and frame header offset value. The frame header offset value is the offset value between the TDD frame structure of the wavelet and the basic TDD frame structure.

[0373] In one embodiment of this disclosure, at least one reserved symbol is present in the first TDD frame structure or the second TDD frame structure among multiple TDD frame structures. The at least one reserved symbol is used to reduce the antenna switching delay from downlink to uplink reception when switching from the downlink time slot of the first TDD frame structure to the uplink time slot of the second TDD frame structure.

[0374] Figure 4 is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 4, the embodiments of the present disclosure relate to a communication method executed by a network device, and the method includes at least one of the following:

[0375] Step S4101: Obtain the TDD frame structure corresponding to any wave position in the cell, wherein there are multiple TDD frame structures in the cell;

[0376] Step S4102: Send first indication information to the set of terminals included in any wavelength, wherein the first indication information is used to indicate the TDD frame structure.

[0377] The possible implementations of steps S4101 to S4102 can be found in the possible implementations of steps S2101 and S2102 in Figure 2, as well as other related parts in the embodiments involved in Figure 3A, which will not be repeated here.

[0378] Figure 5 is a flowchart illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 5, the embodiments of the present disclosure relate to a communication method executed by a terminal, the method including:

[0379] Step S5101: Receive first indication information sent by the network device, wherein the first indication information is used to indicate the TDD frame structure corresponding to the wavelength of the terminal in the cell, and there are multiple TDD frame structures in the cell.

[0380] In one embodiment of this disclosure, the multiple TDD frame structures include a first TDD frame structure and a second TDD frame structure. The first time slot occupied by the first transmission link in the first TDD frame structure corresponds to the first guard interval in the second TDD frame structure, and the second time slot occupied by the second transmission link in the second TDD frame structure corresponds to the second guard interval in the first TDD frame structure.

[0381] In one embodiment of this disclosure, both the first protection interval and the second protection interval are greater than the far-point round-trip time (RTT). The far-point RTT is the maximum RTT in the RTT set, which includes the RTT between network devices and terminals in the terminal set.

[0382] In one embodiment of this disclosure, the second TDD frame structure has a frame header offset value from the first TDD frame structure.

[0383] In one embodiment of this disclosure, the first TDD frame structure is a basic TDD frame structure, and the second TDD frame structure is a frame header offset version of the TDD frame structure, or the first TDD frame structure is a frame header offset version of the TDD frame structure, and the second TDD frame structure is a basic TDD frame structure.

[0384] In one embodiment of this disclosure, the frame header offset value is the length of the first guard interval or the length of the second guard interval.

[0385] In one embodiment of this disclosure, the first indication information includes the frame period corresponding to any TDD frame structure among multiple TDD frame structures and the uplink / downlink time slot ratio corresponding to any TDD frame structure.

[0386] In one embodiment of this disclosure, each of the multiple TDD frame structures has the same frame period and uplink / downlink time slot ratio.

[0387] In one embodiment of this disclosure, the frame period corresponding to any TDD frame structure is determined by the network device based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT. The uplink / downlink time slot ratio corresponding to any TDD frame structure is determined by the network device based on the far-point RTT and the RTT range corresponding to the far-point RTT. The far-point RTT is the maximum RTT in the RTT set, and the RTT set includes the RTT between the network device and each terminal in the terminal set.

[0388] In one embodiment of this disclosure, the uplink / downlink time slot ratio is the ratio of downlink time slots, F time slots, and uplink time slots, wherein the number of F time slots accounts for half of the number of time slots corresponding to the frame period.

[0389] In one embodiment of this disclosure, the method further includes:

[0390] The system receives SSB and system messages broadcast by the network device. The system message includes second indication information, which is used to indicate the adjusted TDD frame structure corresponding to the wavelet. The adjusted TDD frame structure is obtained by the network device adjusting the TDD frame structure of the wavelet based on the obtained wavelet-related information and frame header offset value. The frame header offset value is the offset value between the TDD frame structure of the wavelet and the basic TDD frame structure.

[0391] In one embodiment of this disclosure, at least one reserved symbol is present in the first TDD frame structure or the second TDD frame structure among multiple TDD frame structures. The at least one reserved symbol is used to reduce the antenna switching delay from downlink to uplink reception when switching from the downlink time slot of the first TDD frame structure to the uplink time slot of the second TDD frame structure.

[0392] The possible implementations of step S5101 can be found in the possible implementations of steps S2101, S2102 and S2103 in Figure 2, as well as other related parts in the embodiment involved in Figure 3A, which will not be repeated here.

[0393] In the embodiments disclosed herein, some or all of the steps, and their possible implementations, may be arbitrarily combined with some or all of the steps in other embodiments, or may be arbitrarily combined with the optional implementations of other embodiments.

[0394] This disclosure also provides an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing the steps performed by the terminal in any of the above methods. Alternatively, another apparatus is provided that includes units or modules for implementing the steps performed by a network device (e.g., an access network device, a core network functional node, a core network device, etc.) in any of the above methods.

[0395] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a Central Processing Unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC). The functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD). Taking a field-programmable gate array (FPGA) as an example, it can include a large number of logic gates. The connection relationships between the logic gates are configured through configuration files, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0396] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), a Tensor Processing Unit (TPU), or a Deep Learning Processing Unit (DPU).

[0397] Figure 6A is a schematic diagram of the network device proposed in an embodiment of this disclosure. As shown in Figure 6A, the network device 6100 may include a processing module 6101 and a transceiver module 6102. In some embodiments, the processing module 6101 is used to obtain the TDD frame structure corresponding to any wave position in a cell, wherein multiple TDD frame structures exist within the cell; the transceiver module 6102 is used to send first indication information to the set of terminals included in any wave position, wherein the first indication information is used to indicate the TDD frame structure.

[0398] Figure 6B is a schematic diagram of the terminal structure proposed in an embodiment of this disclosure. As shown in Figure 6B, the terminal 6200 may include a transceiver module 6201. In some embodiments, the transceiver module 6201 is used to receive first indication information sent by a network device, wherein the first indication information is used to indicate the TDD frame structure corresponding to the wavelength of the terminal in the cell, and there are multiple TDD frame structures in the cell.

[0399] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, which may be separate or integrated. Optionally, the transceiver module may be interchangeable with a transceiver.

[0400] In some embodiments, the processing module may be a single module or may include multiple sub-modules. Optionally, the multiple sub-modules may each perform all or part of the steps required by the processing module. Optionally, the processing module may be interchangeable with a processor.

[0401] Figure 7A is a schematic diagram of the structure of the communication device 7100 proposed in an embodiment of this disclosure. The communication device 7100 can be a network device (e.g., access network device, core network device, etc.), a terminal (e.g., user equipment, etc.), a chip, chip system, or processor that supports the network device in implementing any of the above methods, or a chip, chip system, or processor that supports the terminal in implementing any of the above methods. The communication device 7100 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0402] As shown in Figure 7A, the communication device 7100 includes one or more processors 7101. The processor 7101 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. The communication device 7100 is used to execute any of the above methods.

[0403] In some embodiments, the communication device 7100 further includes one or more memories 7102 for storing instructions. Optionally, all or part of the memories 7102 may also be located outside the communication device 7100.

[0404] In some embodiments, the communication device 7100 further includes one or more transceivers 7103. When the communication device 7100 includes one or more transceivers 7103, the transceivers 7103 perform at least one of the communication steps such as sending and / or receiving in the above method (e.g., steps S3102 and S2103, but not limited thereto), and the processor 7101 performs at least one of the other steps (e.g., step S2101, but not limited thereto).

[0405] In some embodiments, a transceiver may include a receiver and / or a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, etc., may be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., may be used interchangeably; and the terms receiver, receiving unit, receiver, receiving circuit, etc., may be used interchangeably.

[0406] In some embodiments, the communication device 7100 may include one or more interface circuits 7104. Optionally, the interface circuit 7104 is connected to the memory 7102, and the interface circuit 7104 can be used to receive signals from the memory 7102 or other devices, and can be used to send signals to the memory 7102 or other devices. For example, the interface circuit 7104 can read instructions stored in the memory 7102 and send the instructions to the processor 7101.

[0407] The communication device 7100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 7100 described in this disclosure is not limited thereto, and the structure of the communication device 7100 may not be limited by FIG. 7A. The communication device may be a standalone device or a part of a larger device. For example, the communication device may be: (1) a standalone integrated circuit IC, or chip, or chip system or subsystem; (2) a collection of one or more ICs, optionally, the IC collection may also include storage components for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0408] Figure 7B is a schematic diagram of the structure of the chip 7200 according to an embodiment of this disclosure. For cases where the communication device 7100 can be a chip or a chip system, the schematic diagram of the chip 7200 shown in Figure 7B can be referenced, but is not limited thereto.

[0409] Chip 7200 includes one or more processors 7201, which are used to perform any of the above methods.

[0410] In some embodiments, chip 7200 further includes one or more interface circuits 7202. Optionally, the interface circuit 7202 is connected to memory 7203, and the interface circuit 7202 can be used to receive signals from memory 7203 or other devices, and the interface circuit 7202 can be used to send signals to memory 7203 or other devices. For example, the interface circuit 7202 can read instructions stored in memory 7203 and send the instructions to processor 7201.

[0411] In some embodiments, the interface circuit 7202 performs at least one of the communication steps such as sending and / or receiving in the above method (e.g., steps S3102 and S2103, but not limited thereto), and the processor 7201 performs at least one of the other steps (e.g., steps S2101 and S3102, but not limited thereto).

[0412] In some embodiments, the terms interface circuit, interface, transceiver pin, transceiver, etc., can be used interchangeably.

[0413] In some embodiments, chip 7200 further includes one or more memories 7203 for storing instructions. Optionally, all or part of the memories 7203 may be located outside of chip 7200.

[0414] This disclosure also proposes a storage medium storing instructions that, when executed on the communication device 7100, cause the communication device 7100 to perform any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0415] This disclosure also provides a program product that, when executed by the communication device 7100, causes the communication device 7100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0416] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

Claims

1. A communication method, characterized in that, Applied to network devices, including: Obtain the TDD frame structure corresponding to any wave position in the cell, wherein multiple TDD frame structures exist within the cell; Send first indication information to the set of terminals included in any of the wavebands, wherein the first indication information is used to indicate the TDD frame structure.

2. The method according to claim 1, characterized in that, The acquisition of the TDD frame structure corresponding to any wave position in the cell includes at least one of the following: The TDD frame structure corresponding to any spectral position in the cell is obtained through dynamic configuration. The TDD frame structure corresponding to any spectral position in the cell is obtained through static pre-configuration. The TDD frame structure corresponding to any spectral position in the cell is obtained through a semi-static configuration method.

3. The method according to claim 1, characterized in that, in, The various TDD frame structures include a first TDD frame structure and a second TDD frame structure. In the first TDD frame structure, the first time slot occupied by the first transmission link corresponds to the first guard interval in the second TDD frame structure, and in the second TDD frame structure, the second time slot occupied by the second transmission link corresponds to the second guard interval in the first TDD frame structure.

4. The method according to claim 3, characterized in that, in, Both the first protection interval and the second protection interval are greater than the far-point round-trip time (RTT). The far-point RTT is the maximum RTT in the RTT set, which includes the RTT between the network device and each terminal in the terminal set.

5. The method according to claim 3 or 4, characterized in that, in, The second TDD frame structure has a frame header offset value compared to the first TDD frame structure.

6. The method according to claim 5, characterized in that, in, The first TDD frame structure is a basic TDD frame structure, and the second TDD frame structure is a frame header offset version of the TDD frame structure, or the first TDD frame structure is a frame header offset version of the TDD frame structure, and the second TDD frame structure is a basic TDD frame structure.

7. The method according to claim 5 or 6, characterized in that, in, The frame header offset value is the length of the first guard interval or the length of the second guard interval.

8. The method according to any one of claims 1 to 7, characterized in that, The method further includes: Based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT, the frame period corresponding to any TDD frame structure among the various TDD frame structures is determined, wherein the far-point RTT is the maximum RTT in the RTT set, and the RTT set includes the RTT between the network device and each terminal in the terminal set.

9. The method according to any one of claims 1 to 8, characterized in that, The method further includes: Based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT, the uplink and downlink time slot allocation ratio corresponding to any TDD frame structure among the multiple TDD frame structures is determined, wherein the far-point RTT is the maximum RTT in the RTT set, and the RTT set includes the RTT between the network device and each terminal in the terminal set.

10. The method according to claim 9, characterized in that, The method further includes: The uplink and downlink time slot ratio is adjusted based on at least one of the following: constellation configuration, far-point RTT, and antenna switching delay.

11. The method according to any one of claims 8 to 10, characterized in that, in, The uplink / downlink time slot ratio is the ratio of downlink time slots, F time slots, and uplink time slots, wherein the number of F time slots accounts for half of the number of time slots corresponding to the frame period.

12. The method according to any one of claims 1 to 11, characterized in that, The method further includes: The TDD frame structure for any given spectral bit is adjusted based on the revisit duration of each SSB.

13. The method according to claim 12, characterized in that, in, The revisit duration of each SSB is determined based on beam information, which includes the number of beams, the number of SSB blocks that can be transmitted within each SSB cycle, and the maximum number of concurrent beams N supported by the on-board antenna. antenna The number N of beams capable of simultaneously transmitting the same SSB block s The number of wavelengths N that a single satellite needs to provide access services under the TDD standard. beam .

14. The method according to any one of claims 1 to 13, characterized in that, in, The first indication information includes the frame period corresponding to any TDD frame structure among the various TDD frame structures and the uplink / downlink time slot ratio corresponding to any TDD frame structure.

15. The method according to any one of claims 1 to 14, characterized in that, in, The various TDD frame structures have the same frame period and uplink / downlink time slot ratio.

16. The method according to any one of claims 1 to 15, characterized in that, The method further includes: The timing broadcast SSB and system message corresponding to any of the multiple TDD frame structures are adopted, and the frame period and uplink / downlink time slot ratio corresponding to any of the TDD frame structures are sent to the set of terminals included in any of the wavebands through the first indication information in the system message.

17. The method according to any one of claims 1 to 16, characterized in that, The method further includes: Obtain the TDD frame structure and frame header offset value for any given wavelength, wherein the frame header offset value is the offset between the TDD frame structure for any given wavelength and the base TDD frame structure. Based on the obtained information related to any wave position and the frame header offset value, the TDD frame structure of any wave position is adjusted to obtain the adjusted TDD frame structure. Broadcast SSB and system messages, and send the adjusted TDD frame structure to the terminal set corresponding to any of the wave positions in the system messages via the second indication information.

18. The method according to any one of claims 1 to 17, characterized in that, in, In the first TDD frame structure or the second TDD frame structure among the multiple TDD frame structures, there is at least one reserved symbol. The at least one reserved symbol is used to reduce the antenna switching delay from downlink to uplink reception when switching from the downlink time slot of the first TDD frame structure to the uplink time slot of the second TDD frame structure.

19. The method according to any one of claims 1 to 18, characterized in that, The step of obtaining the TDD frame structure of each wavelength in at least one wavelength of the cell includes: Obtain the position information of the wave position and the corresponding traffic volume information of the wave position in the wave position snapshot n under the TDD system, wherein n is a positive integer and the initial value of n is 1; Based on the beam traffic information, a beam position set is obtained, wherein the beam position set includes N with the largest traffic volume. beam Each wave position, the N beam The maximum number of wavelengths used to serve a single TDD satellite; For the N beam The geographical locations of each wavelength position are clustered to obtain the total traffic volume of each wavelength position cluster in at least one wavelength position cluster. If the number of wavelengths in any wavelength cluster does not meet the first requirement, the TDD frame structure adopted by any wavelength cluster is classified according to the total service volume conditions of the various TDD frame structures, and the wavelength snapshot n is obtained. If the wavelength snapshot n within the processing capacity or duration threshold corresponding to any wavelength cluster meets the second requirement, the TDD frame structure of any wavelength in at least one wavelength of the cell is obtained.

20. The method according to claim 19, characterized in that, The method further includes: If the wavelength snapshot n within the processing capacity or duration threshold corresponding to any wavelength cluster does not meet the second requirement, the step of obtaining the wavelength position information and the corresponding wavelength traffic volume information in the wavelength snapshot n under the TDD system is re-executed.

21. The method according to claim 19, characterized in that, The method further includes: If the number of wave positions in any wave position cluster meets the first requirement, then the wave position cluster is isolated.

22. The method according to claim 21, characterized in that, The method further includes: If it is determined that there are wave positions in any wave position cluster that do not meet the wave position requirements, the wave positions that do not meet the wave position requirements are removed, and the wave positions that meet the wave position traffic volume selection conditions among the n wave positions are added to the wave position set, wherein the wave position traffic volume selection conditions are the wave positions with the highest wave position traffic volume among the n wave positions excluding the original wave positions.

23. The method according to any one of claims 19 to 22, characterized in that, The method further includes: If it is determined that there is inter-terminal interference between the first wave position and the second wave position in the wave position cluster, the interference type corresponding to the inter-terminal interference is obtained. An interference avoidance strategy corresponding to the interference type is adopted to adjust the interference between the first wave position and the second wave position.

24. The method according to claim 23, characterized in that, Before interference adjustment, the first and second waveforms use different TDD frame structures and the distance between the first and second waveforms is less than a distance threshold.

25. The method according to claim 22 or 24, characterized in that, The adjustment of the interference between the first wave position and the second wave position includes: If the distance between terminals is determined to be less than the estimated distance threshold, the interference between the first and second wavelengths is adjusted using the width of the geographical isolation zone corresponding to the first and second wavelengths. The distance threshold is determined based on the distance between terminals when the interference between the terminals is ignored.

26. The method according to claim 25, characterized in that, The method further includes: The width of the geographical isolation zone is determined based on the geographical threshold corresponding to the terrain where at least one terminal is located.

27. A communication method, characterized in that, Applied to terminals, including: The system receives first indication information sent by a network device, wherein the first indication information is used to indicate the TDD frame structure corresponding to the wavelength of the terminal in the cell, and the cell contains multiple TDD frame structures.

28. The method according to claim 27, characterized in that, in, The various TDD frame structures include a first TDD frame structure and a second TDD frame structure. In the first TDD frame structure, the first time slot occupied by the first transmission link corresponds to the first guard interval in the second TDD frame structure, and in the second TDD frame structure, the second time slot occupied by the second transmission link corresponds to the second guard interval in the first TDD frame structure.

29. The method according to claim 28, characterized in that, in, Both the first protection interval and the second protection interval are greater than the far-point round-trip time (RTT). The far-point RTT is the maximum RTT in the RTT set, which includes the RTT between the network device and each terminal in the terminal set.

30. The method according to claim 28 or 29, characterized in that, in, The second TDD frame structure has a frame header offset value compared to the first TDD frame structure.

31. The method according to claim 29, characterized in that, in, The first TDD frame structure is a basic TDD frame structure, and the second TDD frame structure is a frame header offset version of the TDD frame structure, or the first TDD frame structure is a frame header offset version of the TDD frame structure, and the second TDD frame structure is a basic TDD frame structure.

32. The method according to claim 30 or 31, characterized in that, in, The frame header offset value is the length of the first guard interval or the length of the second guard interval.

33. The method according to any one of claims 27 to 32, characterized in that, in, The first indication information includes the frame period corresponding to any TDD frame structure among the various TDD frame structures and the uplink / downlink time slot ratio corresponding to any TDD frame structure.

34. The method according to claim 32, characterized in that, in, The various TDD frame structures have the same frame period and uplink / downlink time slot ratio.

35. The method according to claim 32, characterized in that, in, The frame period corresponding to any TDD frame structure is determined by the network device based on the far-point round-trip time (RTT) and the RTT range corresponding to the far-point RTT. The uplink / downlink time slot ratio corresponding to any TDD frame structure is determined by the network device based on the far-point RTT and the RTT range corresponding to the far-point RTT. The far-point RTT is the maximum RTT in the RTT set, and the RTT set includes the RTT between the network device and each terminal in the terminal set.

36. The method according to claim 34 or 35, characterized in that, in, The uplink / downlink time slot ratio is the ratio of downlink time slots, F time slots, and uplink time slots, wherein the number of F time slots accounts for half of the number of time slots corresponding to the frame period.

37. The method according to any one of claims 27 to 36, characterized in that, The method further includes: The network device receives SSB and system messages broadcast by the network device. The system message includes second indication information, which is used to indicate the adjusted TDD frame structure corresponding to the wavelength. The adjusted TDD frame structure is obtained by the network device by adjusting the TDD frame structure of the wavelength according to the obtained wavelength-related information and frame header offset value. The frame header offset value is the offset value between the TDD frame structure of the wavelength and the basic TDD frame structure.

38. The method according to any one of claims 27 to 37, characterized in that, in, In the first TDD frame structure or the second TDD frame structure among the multiple TDD frame structures, there is at least one reserved symbol. The at least one reserved symbol is used to reduce the antenna switching delay from downlink to uplink reception when switching from the downlink time slot of the first TDD frame structure to the uplink time slot of the second TDD frame structure.

39. A network device, characterized in that, The network device includes: The processing module is used to obtain the TDD frame structure corresponding to any wave position in the cell, wherein there are multiple TDD frame structures in the cell; The transceiver module is used to send first indication information to the set of terminals included in any of the waveforms, wherein the first indication information is used to indicate the TDD frame structure.

40. A terminal, characterized in that, The terminal includes: The transceiver module is used to receive first indication information sent by the network device, wherein the first indication information is used to indicate the TDD frame structure corresponding to the wavelength of the terminal in the cell, and there are multiple TDD frame structures in the cell.

41. A network device, characterized in that, include: One or more processors; The network device is used to perform the communication method according to any one of claims 1 to 26.

42. A terminal, characterized in that, include: One or more processors; The terminal is used to execute the communication method according to any one of claims 27 to 38.

43. A communication system, characterized in that, The device includes a network device and a terminal, wherein the network device is configured to implement the communication method of any one of claims 1 to 26, and the terminal is configured to implement the communication method of any one of claims 27 to 38.

44. A storage medium storing instructions, characterized in that, When the instructions are executed on a communication device, the communication device performs the communication method as described in any one of claims 1 to 26 or 27 to 38.

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