Communication method and device and storage medium

Abstract

The invention discloses a communication method and device and a storage medium, relates to the technical field of communication, and is used for improving the utilization rate of communication resources. The method comprises: transmitting an uplink signal and a downlink signal related to a terminal in a target terminal group in a time division duplex (TDD) frame, the guard interval between the downlink signal and the uplink signal in the TDD frame being equal to a first round-trip delay, the first round-trip delay being the maximum value of the round-trip delay between a base station and the terminal in the target terminal group.

Description

Technical Field

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

[0002] In the packet time division duplex communication system, in order to avoid the base station and the terminal being in the receiving and transmitting states at the same time, as well as the receiving and transmitting crosstalk within the same terminal group, the frame structure of the current physical frame remains completely consistent on the base station side, representing that the downlink area end of all terminals in the base station coverage area are aligned, the uplink area start is aligned, and the protection interval between the downlink area end and the uplink area start is equal to the maximum round-trip delay in the base station coverage area.

[0003] Although the current physical frame can ensure that there is no transmission and reception conflict between the base station and the terminal, and there is no transmission and reception crosstalk within the same group of terminals, the frame structure of the physical frame of all terminals is completely consistent, resulting in insufficient utilization of communication resources, resulting in a waste of communication resources. Therefore, how to design the frame structure of the physical frame to improve the utilization of communication resources while ensuring that there is no transmission and reception conflict between the base station and the terminal, and there is no transmission and reception crosstalk within the same group of terminals, is a problem that needs to be solved urgently. Summary of the invention

[0004] Embodiments of the present application provide a communication method, device, and storage medium for improving the utilization rate of communication resources.

[0005] In a first aspect, a communication method is provided, comprising:

[0006] The uplink signal and downlink signal related to the terminals in the target terminal group are transmitted in the time division duplex TDD frame, and the protection interval between the downlink signal and the uplink signal in the TDD frame is equal to the first round-trip delay, and the first round-trip delay is the maximum value of the round-trip delay between the base station and the terminals in the target terminal group.

[0007] In a second aspect, a communication device is provided, including:

[0008] The communication module transmits uplink signals and downlink signals related to the terminals in the target terminal group in a time division duplex (TDD) frame. The protection interval between the downlink signal and the uplink signal in the TDD frame is equal to the first round-trip delay. The first round-trip delay is the maximum value of the round-trip delay between the base station and the terminals in the target terminal group.

[0009] According to a third aspect, another communication device is provided, comprising a processor, wherein the processor implements the communication method according to the first aspect when executing a computer program.

[0010] According to a fourth aspect, a computer-readable storage medium is provided, the computer-readable storage medium comprising computer instructions; wherein when the computer instructions are executed, the communication method according to the first aspect is implemented.

[0011] In an embodiment of the present application, by using the maximum value of the round-trip delay between the base station and the terminals in the target terminal group as the protection interval of the TDD frame, the utilization rate of communication resources is improved, thereby improving the channel efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of a frame structure of an NR TDD frame provided in an embodiment of the present application;

[0013] Figure 2 A schematic diagram of the frame structure of an Iridium TDD frame provided in an embodiment of the present application;

[0014] Figure 3 A schematic diagram of a frame structure of a high-orbit satellite TDD frame provided in an embodiment of the present application;

[0015] Figure 4 A schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0016] Figure 5 A flow chart of a communication method provided in an embodiment of the present application;

[0017] Figure 6 A schematic diagram of a TDD frame structure provided in an embodiment of the present application;

[0018] Figure 7 A schematic diagram of channel efficiency on a terminal side provided in an embodiment of the present application;

[0019] Figure 8 A schematic diagram of uplink and downlink configuration of a TDD frame provided in an embodiment of the present application;

[0020] Fig. 9 A schematic diagram of a frame structure of another TDD frame provided in an embodiment of the present application;

[0021] Fig.10 A schematic diagram of a maximum round trip delay and an uplink / downlink ratio within a frame provided in an embodiment of the present application;

[0022] Fig.11 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0023] Fig.12 A schematic diagram of the structure of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "plurality" means two or more. The words "first", "second", etc. do not limit the quantity and execution order, and the words "first", "second", etc. do not limit them to be different.

[0026] It should be noted that, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0027] In the packet time division duplex communication system, there are mainly three types of physical frames:

[0028] (1) New radio (NR) time division duplexing (TDD) frame.

[0029] Within the base station coverage area, the NR TDD frames of all terminals use a unified frame structure, such as Figure 1 As shown in the figure, in order to ensure the start alignment of the uplink area on the base station side, all terminals have the same protection interval, and the duration of the protection interval is the maximum round-trip delay in the base station coverage area. In the actual application of NR TDD frames, since the duration of the protection interval is the maximum round-trip delay in the coverage area, there is an obvious waste of resources for the terminal group with a smaller maximum round-trip delay.

[0030] (2) Iridium TDD frame.

[0031] The Iridium TDD frame is a typical representative of the existing commercial low-orbit satellite communication system, with a frame of 90ms. Figure 2As shown, the time division multiplexing in the frame is used for communication by 4 terminals, and the duration of the protection interval for a single terminal is much longer than the maximum round-trip delay in the base station coverage area. In the actual application of Iridium TDD frames, since the scheduling period of Iridium TDD frames is 90ms, the data transmission time is too long, which in turn leads to a long data transmission delay. When the communication duration of the 4 terminals in the same frame is equal, the channel efficiency of each terminal is no more than 25%. When the communication duration of the 4 terminals in the same frame is not equal, the channel efficiency of at least one terminal is no more than 25%.

[0032] (3) High-orbit satellite TDD frame.

[0033] In the frame format of the high-orbit satellite TDD frame, such as Figure 3 As shown in the figure, the uplink signal and its corresponding downlink signal belong to two different frames. The uplink signal and the downlink signal may be located in two adjacent frames or in two non-adjacent frames. In the actual application of high-orbit satellite TDD frames, in the packet time division duplex scenario where the maximum round-trip delay within the group differs greatly, the channel efficiency is low, and the terminal and base station are required to have a certain cache capacity.

[0034] Specifically, in actual application scenarios, the channel efficiency is no higher than T max,trip,diff is the maximum round-trip delay difference, T min,trip The minimum round trip delay is required. The buffering capacity of the terminal and the base station is required to be at least the number of interleaved frames between the above two frames of the downlink signal and the uplink signal plus 1.

[0035] It can be seen that in the above three physical frames, the channel efficiency is not guaranteed. To this end, the present application provides a communication method, which improves the channel efficiency by using the maximum round-trip delay in the terminal group as the protection interval of the corresponding TDD frame instead of the maximum round-trip delay in the base station coverage area.

[0036] For example, Figure 4 A schematic diagram of the structure of a communication system provided by an embodiment of the present application is shown in FIG. The communication system may include a base station, at least one terminal group (such as Figure 4 Terminal Group 1 and Terminal Group 2 in ).

[0037] The base station can be used to implement functions such as resource scheduling, wireless resource management, and wireless access control of the terminal. Specifically, the base station can be any of a small base station, a wireless access point, a transmission receive point (TRP), a transmission point (TP), and some other access nodes.

[0038] The terminal group includes at least one terminal. Terminal group 1 includes terminal 1, terminal group 2 includes terminal 2 and terminal 3, and the terminal can be a device with terminal functions. The terminal can also be called user equipment (UE), mobile station, mobile terminal, etc. The terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality terminal, an augmented reality terminal, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in remote surgery, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. The embodiments of the present application do not limit the specific device form adopted by the terminal.

[0039] It should be noted that Figure 4 This is just an exemplary framework diagram. Figure 4 The number of devices included in the Figure 4 In addition to the devices shown, the communication system may also include other devices.

[0040] The application scenarios of the embodiments of the present application are not limited. The system architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. It is known to those skilled in the art that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0041] like Figure 5 As shown, an embodiment of the present application provides a communication method, the method comprising the following steps:

[0042] S101. Transmit uplink signals and downlink signals related to terminals in a target terminal group in a time division duplex (TDD) frame.

[0043] The protection interval between the downlink signal and the uplink signal in the TDD frame is equal to the first round trip delay. The first round trip delay is the maximum value of the round trip delay between the base station and the terminal in the target terminal group.

[0044] It should be understood that the communication method provided in the embodiment of the present application can be applied to a base station or a terminal. If the communication method is applied to a base station, the communication method can be specifically implemented as follows: the base station sends a downlink signal related to a terminal in the target terminal group in a time division duplex TDD frame and receives an uplink signal related to a terminal in the target terminal group.

[0045] If the communication method is applied to a terminal, the communication method may be specifically implemented as follows: the terminal receives downlink signals related to terminals in the target terminal group in a time division duplex (TDD) frame, and sends uplink signals related to terminals in the target terminal group.

[0046] It should be understood that the purpose of the guard interval is mainly to avoid mutual interference between uplink and downlink signals. In TDD frame transmission, uplink and downlink signals share the same frequency band, so there will be mutual interference between uplink and downlink signals. If there is no guard interval, the uplink signal may interfere with the downlink signal, resulting in a decrease in the transmission quality of the downlink signal. Similarly, the downlink signal may also interfere with the uplink signal, resulting in a decrease in the transmission quality of the uplink signal. Therefore, the guard interval can effectively avoid interference between uplink and downlink. In the TDD frame, the guard interval needs to be reasonably set to a certain time length, and it needs to be able to ensure that there is no mutual interference between the uplink and downlink signals, and it cannot be set too long to avoid wasting communication resources. Taking the NR TDD frame in the above description as an example, the guard interval is the maximum round-trip delay in the base station coverage area. From the above corresponding analysis, it can be seen that the guard interval of the NR TDD frame is longer, which will cause a waste of communication resources.

[0047] It should be noted that the round-trip delay is an important performance indicator, which indicates the total delay from the start of data transmission at the transmitting end to the receipt of confirmation from the receiving end (the receiving end immediately sends the confirmation after receiving the data). In the embodiment of the present application, the round-trip delay between the base station and the terminal is the delay from the start of the base station sending the signal to the base station receiving the confirmation from the terminal. For the sake of ease of description, the round-trip delay between the base station and the terminal may be referred to as the round-trip delay of the terminal hereinafter, and the maximum value of the round-trip delay between the base station and the terminal in the terminal group may be referred to as the maximum round-trip delay of the terminal group.

[0048] In a TDD communication system, in order to ensure that there is no transmission / reception conflict between the base station and the terminal, and that there is no transmission / reception crosstalk between the terminals in the same group, the maximum round-trip delay of each terminal group is an important reference indicator.

[0049] In some embodiments, the first round trip delay is determined according to the round trip delay of each terminal in the target terminal group.

[0050] As can be seen from the above description, the first round trip delay is the maximum round trip delay between the base station and the terminals in the target terminal group. Therefore, the maximum round trip delay of each terminal in the target terminal group, that is, the maximum round trip delay of the target terminal group, can be used as the first round trip delay.

[0051] For example, there are three terminals in the target terminal group, namely terminal 1, terminal 2 and terminal 3. The round-trip delay of terminal 1 is obtained as A, the round-trip delay of terminal 2 is obtained as B, and the round-trip delay of terminal 3 is obtained as C. Among them, C>B>A, therefore, the round-trip delay C of terminal 3 is taken as the first round-trip delay.

[0052] In other embodiments, the first round-trip delay is determined based on the location information of each terminal in the target terminal group.

[0053] It should be understood that within the coverage area of ​​the base station, the round-trip delay of the terminal is positively correlated with the distance between the terminal and the base station, that is, the greater the distance between the terminal and the base station, the greater the round-trip delay of the terminal.

[0054] For example, there are three terminals in the target terminal group, namely terminal 1, terminal 2 and terminal 3. According to the position relationship of the three terminals, it is known that the terminal farthest from the base station is terminal 2, that is, in the target terminal group, the round-trip delay of terminal 2 is the largest. Therefore, the round-trip delay of terminal 2 is taken as the first round-trip delay.

[0055] In the TDD frame provided in the embodiment of the present application, the maximum value of the round-trip delay between the base station and the terminal in the target terminal group is used as the protection interval, rather than the maximum value of the round-trip delay between the base station and the terminal within the coverage area of ​​the base station. This can ensure that there is no mutual interference between the uplink and downlink signals and avoid waste of communication resources.

[0056] In the coverage area of ​​the base station, the terminals covered by the base station are grouped according to beams, and the terminals in each beam are grouped together. The frame structure of the terminals in each beam is consistent.

[0057] Exemplarily, the communication method provided in the embodiment of the present application is applied to Figure 4 Taking the communication system shown as an example, within the coverage area of ​​the base station, the base station is divided into two groups according to the beam grouping, namely terminal group 1 and terminal group 2. Among them, the maximum round-trip delay corresponding to terminal group 1 is A, that is, the protection interval in the frame structure corresponding to all terminals in terminal group 1 is A. The maximum round-trip delay corresponding to terminal group 2 is B, that is, the protection interval in the frame structure corresponding to all terminals in terminal group 2 is B.

[0058] It should be understood that the communication method provided in the embodiment of the present application can be applied not only to terminal groups grouped by beam, but also to other terminal grouping scenarios, such as grouping by geographic location, grouping by terminal priority, etc., and the present application is still applicable and is not limited here.

[0059] In this way, the maximum round-trip delay between the base station and the terminals in the target terminal group is used as the protection interval, rather than the maximum round-trip delay between the base station and the terminals within the base station coverage area, thereby improving the channel efficiency of each terminal group.

[0060] In some embodiments, the TDD frame includes a downlink signal area, a first uplink and downlink switching area, an uplink signal area, and a second uplink and downlink switching area.

[0061] Among them, the downlink signal area is used to transmit downlink signals, and the uplink signal area is used to transmit uplink signals; part of the area in the downlink signal area and / or part of the area in the uplink signal area, together with the first uplink and downlink switching area, constitute a protection interval between the uplink signal and the downlink signal.

[0062] In this way, placing the uplink signal area and the downlink signal area of ​​the same terminal in the same TDD frame can reduce the buffering requirements for the base station and the terminal, improve the flexibility of the TDD frame, and thus improve the channel efficiency.

[0063] It can be understood that, in the above TDD frame, the position of the guard interval between the uplink signal and the downlink signal can be arbitrarily set in the above TDD frame when the guard interval between the uplink signal and the downlink signal covers the first uplink and downlink switching area, thereby configuring the ratio of the uplink signal to the downlink signal in the above TDD frame. Therefore, in the above TDD frame, the guard interval between the uplink signal and the downlink signal can be divided into the following three cases.

[0064] 1. A partial area in the downlink signal area adjacent to the first uplink and downlink switching area and the first uplink and downlink switching area form a protection interval between the uplink signal and the downlink signal.

[0065] 2. A partial area in the uplink signal area adjacent to the first uplink and downlink switching area and the first uplink and downlink switching area form a protection interval between the uplink signal and the downlink signal.

[0066] 3. A partial area of ​​the downlink signal area adjacent to the first uplink-downlink switching area and a partial area of ​​the uplink signal area adjacent to the first uplink-downlink switching area, together with the first uplink-downlink switching area, form a protection interval between the uplink signal and the downlink signal.

[0067] For example, Figure 6 As shown, it is a schematic diagram of the frame structure of a TDD frame with protection intervals located at different positions provided in an embodiment of the present application.

[0068] like Figure 6 As shown, the protection intervals of the first TDD frame and the second TDD frame are both the corresponding maximum round-trip delay in the terminal group, but the positions of the protection intervals of the two TDD frames are different. The protection interval of the first TDD frame includes more uplink signals, and the protection interval of the second TDD frame includes more downlink signals. It should be understood that the specific position of the protection interval in the TDD frame is not limited in this application and can be set according to actual conditions.

[0069] like Figure 6 As shown, F A 、F B The frame length is T FThe durations of the downlink signal area, the first uplink and downlink switching area, the uplink signal area, and the second uplink and downlink switching area are respectively recorded as T DL 、T switch1 、T UL and T switch2 , T max,trip,n is the maximum round-trip delay within terminal group n.

[0070] It is understandable that in Figure 6 In the two TDD frame structures shown, T max,trip,n Under certain circumstances, the frame length T F The longer it is, the higher the channel efficiency is, and the range of the downlink signal area and the uplink signal area is also larger, which means that the TDD frame structure provided by the present application is more flexible.

[0071] In the TDD frame provided in the embodiment of the present application, the length of the TDD frame can be flexibly adjusted according to the actual situation. Taking the length of the TDD frame as 20ms as an example, compared with the length of the Iridium TDD frame of 90ms, the scheduling period of the TDD frame provided by the present application is shortened by 70ms, which is about 77%, thereby improving the flexibility of scheduling. In the scenario of low-orbit satellites, taking the low-orbit satellite altitudes of 600km and 1200km as examples, the channel efficiency at the sub-satellite point can reach 80% and 60%. The channel efficiency at the edge calculated at an elevation angle of 30 degrees for ground equipment, that is, the minimum channel efficiency of the terminal covered by the low-orbit satellite, can reach 64% and 33%, which is significantly improved compared to the channel efficiency of the Iridium TDD frame. Compared with the high-orbit satellite TDD frame, the TDD frame provided by the present application places the downlink signal area and the uplink signal area in the same frame, reducing the buffering requirements for base stations and terminals. Taking the length of the TDD frame as 20ms as an example, the low-orbit satellite altitudes are 600km and 1200km. Taking the lowest elevation angle of 30 degrees of the ground equipment as the edge condition, the minimum round-trip delays are 4ms and 8ms respectively, and the maximum round-trip delay differences are 3.17225ms and 5.3352ms respectively. Compared with the high-orbit satellite TDD frames, the channel efficiency at low-orbit satellite altitudes of 600km and 1200km is no more than 20.70% and 33.31% respectively. The channel efficiency of the TDD frame provided in this application is much higher than that of the high-orbit satellite TDD frame.

[0072] In this way, compared with other TDD frame structures such as NR TDD frame structure, the maximum round-trip delay T in the base station coverage area is max,trip As a protection interval, this application sets the maximum round-trip delay T in the terminal group max,trip,n As a protection interval, the protection interval within the terminal group is shortened by T max,trip -T max,trip,n, improving channel efficiency. In addition, the TDD frame provided by the embodiment of the present application is more flexible, and the ratio of the downlink signal to the uplink signal in the TDD frame can be configured by flexibly adjusting the position of the protection interval between the downlink signal and the uplink signal, thereby better adapting to different business needs, and at the same time, better utilizing communication resources, thereby improving channel efficiency.

[0073] In order to accurately calculate the channel efficiency benefit of the TDD frame provided in the embodiment of the present application, the embodiment of the present application calculates the channel efficiency under the calculation scenario shown in Table 1.

[0074] Table 1

[0075]

[0076] During the calculation, T switch1 and T switch2 Select 1 symbol, T UL Select 279 symbols, T DL Select 279 symbols. For a specific group, the adjustable range of uplink and downlink ratios is:

[0077]

[0078] It should be noted that in the calculation process, T switch1 and T switch2 All choose 1 symbol, so in the calculation process, no distinction is made between T switch1 and T switch2 , unified with T switch express.

[0079] Its channel efficiency is:

[0080]

[0081] Specifically, through the above calculation process, the round-trip delay at the edge of the base station coverage area is calculated to be 7.168ms, and the round-trip delay at the sub-satellite point is 4ms. If the NR TDD frame is used, in the same application scenario, there is at least 7.168ms of idle time on the base station side, and for the terminal at the sub-satellite point, there is a waste of about 3ms of time resources.

[0082] like Figure 7 FIG. 1 is a schematic diagram of a channel efficiency on the terminal side provided by an embodiment of the present application. Figure 7It can be seen that the TDD frame provided in the embodiment of the present application has a channel efficiency gain for the terminal group whose maximum round-trip delay in the terminal group is less than the maximum round-trip delay in the base station coverage area. The channel efficiency gain decreases almost linearly with the increase of the maximum round-trip delay in the group. In the above application scenario, the channel efficiency at the sub-satellite point is as high as 79.64%, and gradually decreases with the increase of the maximum round-trip delay in the terminal group, and coincides with the channel efficiency of the NR TDD frame at the maximum round-trip delay in the terminal group of 7.16ms.

[0083] In some embodiments, the base station may determine the position of the protection interval between the uplink signal and the downlink signal according to the uplink and downlink transmission ratio of the target terminal group.

[0084] It can be understood that in a communication system, the uplink and downlink transmission ratio of each terminal group can directly reflect the uplink and downlink transmission requirements of each terminal group. For example, if the uplink and downlink transmission ratio of terminal group 1 is large, it means that the uplink transmission requirement of terminal group 1 is large. If the uplink and downlink transmission ratio of terminal group 2 is small, it means that the downlink transmission requirement of terminal group 2 is large. Therefore, it is necessary to flexibly adjust the position of the protection interval in the TDD frame corresponding to each terminal group according to the uplink and downlink transmission ratio of each terminal group, and then configure the ratio of the downlink signal and the uplink signal in the TDD frame.

[0085] Specifically, if the uplink and downlink transmission ratio of the target terminal group is large, the protection interval of the TDD frame corresponding to the target terminal group can be set to include more downlink signal areas, thereby increasing the proportion of uplink consumption to meet the uplink transmission requirements of the target terminal group. Correspondingly, if the uplink and downlink transmission ratio of the target terminal group is small, the protection interval of the TDD frame corresponding to the target terminal group can be set to include more uplink signal areas, thereby increasing the proportion of downlink consumption to meet the downlink transmission requirements of the target terminal group.

[0086] For example, Figure 8 As shown, a TDD frame on the base station side is divided into a downlink area and an uplink area. Under the condition that the protection interval in the TDD frame corresponding to each terminal group includes the first uplink and downlink switching area, the position of the protection interval can be moved arbitrarily within a TDD frame. Among them, the protection interval in the TDD frame corresponding to the terminal group includes the first uplink and downlink switching area, which can be specifically implemented as follows:

[0087] <=Gap start<=start of the first uplink and downlink switching area, end of the first uplink and downlink switching area<=Gap end<=frame end.

[0088] Figure 8A schematic diagram showing the ratio of uplink signals and downlink signals in the TDD frame structure corresponding to four terminal groups is shown. Among them, the uplink arrow represents the uplink signal in the TDD frame, and the downlink arrow represents the downlink signal in the TDD frame. The end of the downlink signal of all terminal groups is located in the downlink area of ​​the TDD frame on the base station side, and the start of the uplink signal of all terminal groups is located in the uplink area of ​​the TDD frame on the base station side, thereby ensuring that the base station side is in one of the two states of expenditure and reception or transmission at the same time. The solid line and the dotted line represent the two situations in which the ratio of the uplink signal to the downlink signal is the largest and the smallest, respectively. In practical applications, the protection interval of the TDD frame corresponding to each terminal group can be moved between the above two situations according to the uplink and downlink transmission requirements of each terminal group, thereby realizing the adaptive adjustment of the ratio of the uplink signal to the downlink signal according to the uplink and downlink transmission requirements of each terminal group.

[0089] As another example, take the satellite base station at an altitude of 600km and a communication distance of 1050km as an example. If the frame length of the TDD frame is set to 10ms, and the ratio of the uplink signal to the downlink signal on the satellite base station side is 1:1, the communication resource ratio of the uplink signal to the downlink signal of various terminal groups can be adaptively selected between 1:5-5:1.

[0090] It should be noted that in Figure 8 In order to facilitate understanding, the first switching area and the second switching area of ​​the TDD frame are not reflected. In the terrestrial NR communication system, the round trip time (RTT) is much smaller than the RF switching time and is not in the same order of magnitude as the frame length. Therefore, it is impossible to adaptively adjust the ratio of uplink and downlink signals according to the scheme described above. In the satellite communication system, the round trip time is much larger than the RF switching time and is in the same order of magnitude as the frame length, so the above scheme can be applied to the satellite communication system.

[0091] In this way, the position of the guard interval is set according to the different uplink and downlink transmission ratios of each terminal group, and then the ratio of uplink signals to downlink signals is configured, thereby improving the utilization of communication resources and thus improving channel efficiency.

[0092] like Fig. 9 FIG. 1 is a schematic diagram of a frame structure of a TDD frame on the base station side under multiple terminal groups provided in an embodiment of the present application. max,trip,1 is the maximum round trip delay corresponding to the first terminal group, and so on, T max,trip,N is the maximum round-trip delay corresponding to the Nth terminal group.

[0093] Based on the TDD frame provided in the embodiment of the present application, Fig.10 A schematic diagram showing the configurable range of the maximum round-trip delay and the uplink and downlink ratio within a frame corresponding to a terminal group.

[0094] In this way, the uplink and downlink duration ratio within the frame can be dynamically adjusted according to the uplink and downlink requirements of the target terminal group, which can improve the utilization rate of communication resources. Furthermore, while the number of terminal groups remains unchanged, the number of terminal groups communicating within a certain period of time can be increased, ultimately improving the channel efficiency.

[0095] In some embodiments, the length of the TDD frame is determined according to the second round trip delay and the length of the second uplink and downlink switching region.

[0096] The second round-trip delay is the maximum value of the round-trip delay between the base station and the terminal within the coverage area of ​​the base station.

[0097] Exemplarily, the length of the TDD frame may be greater than the sum of the maximum round trip delay within the base station coverage area and the length of the second uplink and downlink switching area.

[0098] In this way, the length of the TDD frame is determined according to the maximum round-trip delay between the base station and the terminal within the coverage area of ​​the base station and the length of the second uplink and downlink switching zone, ensuring that there is no transmission and reception conflict between the base station and the terminal, and no transmission and reception crosstalk between the terminals in the group, and ensuring that the base station completes the switching of downlink and uplink signals in the first uplink and downlink switching zone.

[0099] It should be noted that the embodiment of the present application does not require the length of the TDD frame and can be set according to actual conditions. However, it is necessary to ensure that the base station and the terminal in the communication system communicate normally to avoid transmission and reception conflicts and transmission and reception crosstalk.

[0100] In some embodiments, the length of the first uplink and downlink switching zone of the TDD frame is equal to the maximum value of the uplink and downlink switching durations of all terminals within the base station coverage area, and the length of the second uplink and downlink switching zone is equal to the uplink and downlink switching duration of the base station.

[0101] It should be noted that when the terminal switches uplink and downlink services, it takes a certain amount of time to complete the switching process. Therefore, the length of the first uplink and downlink switching area of ​​the TDD frame is equal to the maximum value of the uplink and downlink switching durations of all terminals in the base station coverage area to ensure that all terminals on the terminal side have enough time to complete the switching process. Similarly, when the base station switches uplink and downlink services, it also takes a certain amount of time to complete the switching process. Therefore, the length of the second uplink and downlink switching area of ​​the TDD frame is equal to the uplink and downlink switching duration of the base station to ensure that the base station can complete the switching process.

[0102] It is understandable that, in order to realize the above functions, the communication device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0103] The embodiment of the present application can divide the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one functional module. The above integrated module can be implemented in the form of hardware or software. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. The following is an example of dividing each functional module corresponding to each function.

[0104] Fig.11 A schematic diagram of the structure of a communication device provided in an embodiment of the present application is shown. Fig.11 As shown, the communication device 110 includes a communication module 1101 .

[0105] Communication module 1101 is used to transmit uplink signals and downlink signals related to terminals in the target terminal group in a time division duplex (TDD) frame. The protection interval between the downlink signal and the uplink signal in the TDD frame is equal to the first round-trip delay, and the first round-trip delay is the maximum value of the round-trip delay between the base station and the terminals in the target terminal group.

[0106] In some embodiments, the TDD frame includes a downlink signal area, a first uplink and downlink switching area, an uplink signal area and a second uplink and downlink switching area; the downlink signal area is used to transmit downlink signals, and the uplink signal area is used to transmit uplink signals; a partial area in the downlink signal area and / or a partial area in the uplink signal area, together with the first uplink and downlink switching area, constitute a protection interval between the uplink signal and the downlink signal.

[0107] In some embodiments, in a TDD frame, a partial area of ​​the downlink signal area adjacent to the first uplink and downlink switching area and the first uplink and downlink switching area constitute a protection interval between the uplink signal and the downlink signal.

[0108] In some embodiments, in a TDD frame, a partial area of ​​the uplink signal area adjacent to the first uplink-downlink switching area and the first uplink-downlink switching area constitute a protection interval between the uplink signal and the downlink signal.

[0109] In some embodiments, in a TDD frame, a partial area of ​​the downlink signal area adjacent to the first uplink and downlink switching area, a partial area of ​​the uplink signal area adjacent to the first uplink and downlink switching area, and the first uplink and downlink switching area constitute a protection interval between the uplink signal and the downlink signal.

[0110] In some embodiments, the communication device 110 further includes a determination module 1102, which is configured to determine the position of the protection interval between the uplink signal and the downlink signal according to the uplink and downlink transmission ratio of the target terminal group.

[0111] In some embodiments, the length of the TDD frame is determined according to the second round-trip delay and the length of the second uplink and downlink switching zone, and the second round-trip delay is the maximum value of the round-trip delay between the base station and the terminal within the coverage area of ​​the base station.

[0112] In some embodiments, the length of the TDD frame is greater than the sum of the maximum round-trip delay within the base station coverage area and the length of the second uplink and downlink switching zone.

[0113] In some embodiments, the length of the first uplink and downlink switching zone is equal to the maximum value of the uplink and downlink switching durations of all terminals within the coverage area of ​​the base station.

[0114] In some embodiments, the length of the second uplink and downlink switching zone is equal to the uplink and downlink switching duration of the base station.

[0115] In the case of implementing the functions of the above-mentioned integrated modules in the form of hardware, the embodiments of the present application provide the following Fig.12 The communication device shown. Fig.12 As shown, the communication device 120 includes: a processor 1202 and a bus 1204. Optionally, the wake-up signal sending device may further include a memory 1201; illustratively, the wake-up signal sending device may further include a communication interface 1203.

[0116] The processor 1202 may be a processor that implements or executes various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of the present application. The processor 1202 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of the present application. The processor 1202 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0117] The communication interface 1203 is used to connect with other devices via a communication network, such as Ethernet, wireless access network, wireless local area network (WLAN), etc.

[0118] The memory 1201 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0119] As a possible implementation, the memory 1201 may exist independently of the processor 1202, and the memory 1201 may be connected to the processor 1202 via a bus 1204 for storing instructions or program codes. When the processor 1202 calls and executes the instructions or program codes stored in the memory 1201, the device discovery method provided in the embodiment of the present application can be implemented.

[0120] In another possible implementation, the memory 1201 may also be integrated with the processor 1202 .

[0121] The bus 1204 may be an extended industry standard architecture (EISA) bus, etc. The bus 1204 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.12 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0122] Some embodiments of the present application provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium), which stores computer program instructions. When the computer program instructions are executed on a computer, the computer executes a method as described in any of the above embodiments.

[0123] Exemplarily, the above-mentioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., compact disks (CD), digital versatile disks (DVD), etc.), smart cards and flash memory devices (e.g., erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.). The various computer-readable storage media described in the present disclosure may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0124] An embodiment of the present application provides a computer program product including instructions. When the computer program product is run on a computer, the computer is enabled to execute a method of any one of the above embodiments.

[0125] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: The method comprises: An uplink signal and a downlink signal related to a terminal in a target terminal group are transmitted in a time division duplex (TDD) frame, wherein a protection interval between the downlink signal and the uplink signal in the TDD frame is equal to a first round-trip delay, and the first round-trip delay is a maximum value of a round-trip delay between a base station and a terminal in the target terminal group.

2. The method according to claim 1, characterized in that The TDD frame includes a downlink signal area, a first uplink and downlink switching area, an uplink signal area and a second uplink and downlink switching area; the downlink signal area is used to transmit the downlink signal, and the uplink signal area is used to transmit the uplink signal; a partial area in the downlink signal area and / or a partial area in the uplink signal area, together with the first uplink and downlink switching area, constitute a protection interval between the uplink signal and the downlink signal.

3. The method according to claim 2, characterized in that In the TDD frame, a partial area of ​​the downlink signal area adjacent to the first uplink and downlink switching area and the first uplink and downlink switching area constitute a protection interval between the uplink signal and the downlink signal.

4. The method according to claim 2, characterized in that: In the TDD frame, a partial area of ​​the uplink signal area adjacent to the first uplink and downlink switching area and the first uplink and downlink switching area constitute a protection interval between the uplink signal and the downlink signal.

5. The method according to claim 2, characterized in that: In the TDD frame, a partial area of ​​the downlink signal area adjacent to the first uplink and downlink switching area, a partial area of ​​the uplink signal area adjacent to the first uplink and downlink switching area, and the first uplink and downlink switching area constitute a protection interval between the uplink signal and the downlink signal.

6. The method according to claim 2, characterized in that The method further comprises: The position of the protection interval between the uplink signal and the downlink signal is determined according to the uplink and downlink transmission ratio of the target terminal group.

7. The method according to claim 2, characterized in that The length of the TDD frame is determined according to a second round-trip delay and a length of the second uplink and downlink switching area, where the second round-trip delay is a maximum value of a round-trip delay between the base station and a terminal within a coverage area of ​​the base station.

8. The method according to claim 7, characterized in that The length of the TDD frame is greater than the sum of the maximum round-trip delay in the base station coverage area and the length of the second uplink and downlink switching area.

9. The method according to claim 2, characterized in that: The length of the first uplink and downlink switching area is equal to the maximum value of the uplink and downlink switching durations of all terminals within the coverage area of ​​the base station.

10. The method according to claim 2, characterized in that The length of the second uplink and downlink switching area is equal to the uplink and downlink switching duration of the base station.

11. A communication device, characterized in that: include: a processor and a memory for storing instructions executable by the processor; Wherein, when the processor is configured to execute the instruction, the communication device executes the method according to any one of claims 1 to 10.

12. A computer storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 10.

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