Method and apparatus for adjusting a communication signal

Abstract

The application discloses a communication signal adjustment method and device. The method comprises the following steps: obtaining deployment information of a base station and time slot information of the base station in a time division duplex (TDD) communication mode, and determining a first guard time according to the deployment information and the time slot information; determining an adjustment strategy according to the deployment information, the first guard time and a second guard time of an original access signal, wherein the adjustment strategy is used to adjust the proportion of a plurality of different symbols in a first target special subframe, the first target special subframe is a special subframe adjacent to a continuous uplink symbol sequence in the original access signal; and adjusting the original access signal according to the adjustment strategy to generate a target access signal, wherein the coverage range of the target access signal is greater than that of the original access signal. The application solves the technical problem that a 5G access signal generated by a 5G TDD in an existing time slot ratio cannot meet the demand of 5G ultra-remote coverage.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and more specifically, to a method and apparatus for adjusting communication signals. Background Technology

[0002] In related technologies, the existing 5G network (the existing operating network) uses Time Division Duplexing (TDD) communication technology on the 3.5 GHz band, with a time slot ratio of 7:3 for 2.5 milliseconds (ms). However, the 5G TDD 7:3 time slot ratio mentioned above, based on the 3rd Generation Partnership Project (3GPP) protocol specifications of the existing global mobile communication system, cannot meet the requirements of 5G ultra-long-range coverage.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This application provides a method and apparatus for adjusting communication signals, so as to at least solve the technical problem that the 5G access signals generated by the existing 5G TDD network under the existing time slot configuration cannot meet the requirements of 5G ultra-long-distance coverage.

[0005] According to one aspect of the embodiments of this application, a method for adjusting a communication signal is provided, comprising: acquiring deployment information of a base station and time slot information of the base station in time division duplex (TDD) communication mode, and determining a first protection time slot based on the deployment information and the time slot information, wherein the deployment information includes at least a preset signal coverage range, and the coverage range of the TDD communication signal whose protection time slot is the first protection time slot is greater than or equal to the preset signal coverage range; determining an adjustment strategy based on the deployment information, the first protection time slot, and a second protection time slot of the original access signal, wherein the adjustment strategy is used to adjust the proportion of multiple different symbols in a first target special subframe, the first target special subframe being a special subframe in the original access signal adjacent to a continuous uplink symbol sequence, the original access signal being a signal used to request access to the base station in TDD communication mode; adjusting the original access signal according to the adjustment strategy to generate a target access signal, wherein the coverage range of the target access signal is greater than the coverage range of the original access signal.

[0006] Optionally, the deployment information further includes: a first altitude of the base station and a second altitude of the terminal communicating with the base station via TDD; before determining the first protection time slot based on the deployment information and time slot information, the method includes: determining the line-of-sight distance based on the first altitude and the second altitude, wherein the line-of-sight distance is the distance between the base station and the farthest terminal, and the farthest terminal is located in the area corresponding to the signal coverage range of the base station; comparing the line-of-sight distance with a preset signal coverage range to obtain a comparison result; if the comparison result indicates that the line-of-sight distance is greater than or equal to the preset signal coverage range, determining the first protection time slot based on the deployment information and time slot information; if the comparison result indicates that the line-of-sight distance is less than the preset signal coverage range, rejecting the determination of the first protection time slot.

[0007] Optionally, determining the first protection time slot based on deployment information and time slot information includes: determining the transmission format of the signal transmitted by the base station through the Physical Random Access Channel (PRACH) when the base station performs TDD communication based on the base station location information in the deployment information, wherein the base station location information is used to indicate the type of area where the base station is located, including: high-speed mobile area and non-high-speed mobile area, and the transmission format corresponding to different base station location information is different; determining the first protection time slot based on the transmission format, time slot information and preset signal coverage range in the deployment information.

[0008] Optionally, the time slot information includes: a preset duration, a continuous uplink time slot duration, and a special time slot duration, wherein the preset duration is the length of each subframe in the TDD communication mode; determining the first protection time slot according to the transmission format, the time slot information, and the preset signal coverage in the deployment information includes: determining a first value interval according to the preset signal coverage and the preset duration; determining the access signal information corresponding to the transmission format, wherein the access signal information includes at least: a first length of each cyclic prefix CP and a second length of each preamble sequence SEQ; determining a second value interval according to the access signal information, the preset duration, the continuous uplink time slot duration, and the special time slot duration; if there is an intersection between the second value interval and the first value interval, determining any one of the multiple durations contained in the intersection as the target duration, and determining the protection time slot with a length of the target duration as the first protection time slot.

[0009] Optionally, the second protection time slot is determined by the following method: when the base station location information indicates that the type of the area where the base station is located is a high-speed mobile area, the transmission format is determined to be the first transmission format, and the protection time slot corresponding to the first transmission format is determined to be the second protection time slot; when the base station location information indicates that the type of the area where the base station is located is a non-high-speed mobile area, the transmission format is determined to be the second transmission format, and the protection time slot corresponding to the second transmission format is determined to be the second protection time slot.

[0010] Optionally, an adjustment strategy is determined based on deployment information, a first protection time slot, and a second protection time slot of the original access signal, including: determining a third length for each uplink symbol in the original access signal; determining a first value based on the first protection time slot, the second protection time slot, the third length, and the length of each subframe in the TDD communication mode contained in the time slot information, wherein the first value is the number of uplink symbols contained in the first target special subframe after adjusting the first target special subframe according to the adjustment strategy; determining a second value based on a preset signal coverage area, a preset response time, and a third length in the deployment information, wherein the preset response time is the response time of the terminal communicating with the base station under TDD, and the second value is the number of protection symbols contained in the first target special subframe after adjusting the first target special subframe according to the adjustment strategy; determining a third value based on the first value, the second value, and the total number of symbols contained in the first target special subframe, wherein the third value is the number of downlink symbols contained in the first target special subframe after adjusting the first target special subframe according to the adjustment strategy; and determining the proportional sequence determined by the first value, the second value, and the third value as the adjustment strategy.

[0011] Optionally, adjusting the original access signal according to the adjustment strategy to generate the target access signal includes: adjusting the first target special subframe contained in the original access signal according to the adjustment strategy to obtain the target access signal, wherein the proportion of various symbols contained in the first target special subframe after adjustment according to the adjustment strategy is the proportion indicated by the adjustment strategy.

[0012] Optionally, after generating the target access signal, the method includes: determining whether there is interference between the target access signal and the original access signal based on a first target special subframe and a second target special subframe, and obtaining a determination result, wherein the second target special subframe is a special subframe in the target access signal that is adjacent to a continuous uplink symbol sequence; if the determination result indicates that there is interference between the target access signal and the original access signal, determining an avoidance strategy corresponding to the interference type, wherein the interference type includes: downlink transmission interference and service interference, and different interference types correspond to different avoidance strategies; and executing the interference avoidance strategy.

[0013] Optionally, determining whether there is interference between the target access signal and the original access signal based on the first target special subframe and the second target special subframe, and obtaining the determination result, includes: determining the first time corresponding to each downlink symbol in the first target special subframe, and determining the second time corresponding to each uplink symbol in the second target special subframe; if any first time and any second time are the same, the determination result is that there is interference between the target access signal and the original access signal; if there are no identical first time and second time, the determination result is that there is no interference between the target access signal and the original access signal.

[0014] Optionally, the interference avoidance strategy includes: in the case of downlink transmission interference, executing a first interference avoidance strategy, wherein the first interference avoidance strategy is used to instruct the base station to prohibit downlink transmission at a target time, the target time being the time when the base station simultaneously transmits downlink symbols in a first target special subframe and uplink symbols in a second target special subframe; in the case of service interference, executing a second interference avoidance strategy, wherein the second interference avoidance strategy is used to instruct the base station to stop service scheduling with neighboring cells, the neighboring cells being cells that communicate with signal sources within the coverage area of ​​the target access signal but are not within the coverage area of ​​the target access signal.

[0015] According to another aspect of the embodiments of this application, a communication signal adjustment device is also provided, comprising: an acquisition module, configured to acquire deployment information of a base station and time slot information of the base station in time division duplex (TDD) communication mode, and determine a first protection time slot based on the deployment information and the time slot information, wherein the deployment information includes at least: a preset signal coverage range, and the coverage range of the TDD communication signal with the first protection time slot being greater than or equal to the preset signal coverage range; a determination module, configured to determine an adjustment strategy based on the deployment information, the first protection time slot, and a second protection time slot of the original access signal, wherein the adjustment strategy is used to adjust the proportion of multiple different symbols in a first target special subframe, the first target special subframe being a special subframe in the original access signal adjacent to a continuous uplink symbol sequence, and the original access signal being a signal used to request access to the base station in TDD communication mode; and a generation module, configured to adjust the original access signal according to the adjustment strategy to generate a target access signal, wherein the coverage range of the target access signal is greater than the coverage range of the original access signal.

[0016] In this embodiment, the deployment information of the base station and the time slot information of the base station in Time Division Duplex (TDD) communication mode are obtained, and a first protection time slot is determined based on the deployment information and the time slot information. The deployment information includes at least: a preset signal coverage range, and the coverage range of the TDD communication signal with the first protection time slot being greater than or equal to the preset signal coverage range. An adjustment strategy is determined based on the deployment information, the first protection time slot, and the second protection time slot of the original access signal. The adjustment strategy is used to adjust the proportion of multiple different symbols in a first target special subframe. The first target special subframe is a special subframe in the original access signal that is adjacent to a continuous uplink symbol sequence. The original access signal is the signal used to request access to the base station in TDD communication mode. The original access signal is adjusted according to the adjustment strategy to generate a target access signal, wherein the coverage range of the target access signal is greater than the coverage range of the original access signal. This is achieved by breaking the 3GPP protocol's restrictions on Physical Random Access Channels. By overcoming the format limitations of the access signal (PRACH) channel, 5G ultra-long-range access signals are generated for different frame structures and ultra-long-range coverage requirements of TDD, thus achieving the goal of meeting the ultra-long-range coverage requirements of 5G and improving the technical effect of network long-distance access capability. This solves the technical problem that the 5G access signals generated by the existing 5G TDD network under the current time slot ratio cannot meet the requirements of 5G ultra-long-range coverage. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of a communication system 100 according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of a long-format access signal supported by PRACH under a 3GPP protocol, based on relevant technologies.

[0020] Figure 3 This is a flowchart illustrating the steps of a communication signal adjustment method according to an embodiment of this application;

[0021] Figure 4 This is a graph illustrating the relationship between base station height and line-of-sight height under the influence of the Earth's curvature, according to an embodiment of this application.

[0022] Figure 5 It is a record table of relevant information for different PRACH signals according to an embodiment of this application;

[0023] Figure 6This is a schematic diagram illustrating the adjustment of the original access signal according to an embodiment of this application;

[0024] Figure 7 This is a schematic diagram of symbols composed of multiple access signals with different coverage areas according to an embodiment of this application;

[0025] Figure 8 This is a structural diagram of a communication signal adjustment device according to an embodiment of this application;

[0026] Figure 9 This is a flowchart illustrating the operation of a communication signal adjustment device according to an embodiment of this application;

[0027] Figure 10 It is a record table of access signals corresponding to different expected coverage areas according to an embodiment of this application. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] To better understand the embodiments of this application, the technical terms involved in the embodiments of this application are explained below:

[0031] Ultra-long-range coverage requirement / 5G ultra-long-range coverage requirement: The ultra-long-range coverage requirement (5G ultra-long-range coverage requirement) involved in this solution refers to the existence of 5G ultra-long-range coverage requirement. Among them, 5G ultra-long-range coverage refers to achieving 5G wide-area coverage exceeding that of ordinary macro base stations in vast, open special areas such as sea, grassland, and desert.

[0032] Cellular cell: Also known as a cellular cell, it refers to the area covered by one base station or part of a base station (fan antenna) in a cellular mobile communication system, within which mobile stations can reliably communicate with the base station via wireless channels.

[0033] In related technologies, 5G ultra-long-distance coverage is achieved through the following methods: 1) Sending channel configuration information, transmitting access signals to 5G base stations, and receiving access signals uploaded by terminals within the target detection duration. This allows 5G base stations to extend the detection duration of access signals by using downlink time slots adjacent to uplink time slots within the original channel cycle as extended time slots, thus reserving more access latency for ultra-long-distance terminals and meeting the access requirements of 5G base stations for ultra-long-distance coverage. This method achieves 5G ultra-long-distance coverage by applying a different TDD time slot ratio than the existing network. However, introducing a different TDD time slot ratio will simultaneously introduce time slot interference, thus presenting a time slot interference problem. 2) Expanding the guard period (GP) by selectively scheduling uplink and downlink subframes in 4G TDD improves spectrum utilization, achieving ultra-long-distance coverage and avoiding downlink signal interference with uplink signals. However, this method is designed for 4G TDD and therefore cannot be directly applied to 5G TDD. To address this issue, relevant solutions are provided in the embodiments of this application, which are described in detail below.

[0034] According to an embodiment of this application, a method embodiment for adjusting communication signals is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0035] The methods and embodiments provided in this application can be executed on mobile terminals, computer terminals, or similar computing devices.

[0036] The technical solutions of this application embodiment can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, or 5G system, etc.

[0037] For example, the communication system 100 used in the embodiments of this application is as follows: Figure 1 As shown. The communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or a communication terminal, terminal). The network device 110 can provide communication coverage for a specific geographical area and can communicate with terminal devices located within that coverage area. Optionally, the network device 110 may be a base station (BTS) in a GSM or CDMA system, a base station (NodeB, NB) in a WCDMA system, or a radio controller in a Cloud Radio Access Network (CRAN). Alternatively, the network device may be a mobile switching center, relay station, access point, vehicle-mounted equipment, wearable device, hub, switch, bridge, router, network-side equipment in a 5G network, or network equipment in a future evolved Public Land Mobile Network (PLMN), etc.

[0038] The communication system 100 also includes at least one terminal device 120 located within the coverage area of ​​the network device 110. As used herein, "terminal device" includes, but is not limited to, devices configured to receive / transmit communication signals via wired connections, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, direct cable connection; and / or another data connection / network; and / or via a wireless interface, such as for cellular networks, Wireless Local Area Networks (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM radio transmitters; and / or other terminal devices. Terminal devices configured to communicate via a wireless interface may be referred to as "wireless communication terminal," "wireless terminal," or "mobile terminal." Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communications system (PCS) terminals that can combine cellular radiotelephony with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, notebooks, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or handheld receivers or other electronic devices that include radiotelephone transceivers. Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, user terminals, terminals, wireless communication equipment, user agents, or user equipment. Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in future PLMNs, etc.

[0039] Optionally, the terminal devices 120 can perform device-to-device (D2D) communication with each other.

[0040] Alternatively, a 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

[0041] This application provides a method for adjusting communication signals applied to base stations, particularly 5G base stations. The communication signal is a PRACH access signal. The PRACH access signal adjusted according to the method provided in this application can achieve 5G ultra-long-range coverage. Limiting factors for 5G ultra-long-range coverage include: PRACH format, GP format, transceiver height, and service channel. On one hand, PRACH determines the terminal access distance. The PRACH access signal consists of three parts: a cyclic prefix (CP), a preamble sequence (SEQ), and a GP. Different PRACH formats correspond to different durations. The longer the distance, the larger the required CP and GP lengths. This problem exists in both TDD and Frequency Division Duplex (FDD). Regarding the GP format, TDD structures have a divided-duplex mode, requiring GP protection symbols to avoid interference during uplink / downlink switching. The longer the distance, the larger the required GP, while FDD does not have this limitation. The current NR 3.5GHz band TDD uses a time slot ratio of 2.5ms dual-cycle 7:3, i.e., DDDSDUDDSUU, and the symbol ratio in the special subframe (S) is 8:4:2, i.e., 8 downlink symbols (D), 4 GP, and 2 uplink symbols (U). According to the 3GPP protocol, the 5G NR access signal PRACH supports 4 long formats and 9 short formats. Figure 2 This is a schematic diagram of the long format access signals supported by PRACH under the 3GPP protocol, as shown below. Figure 2 As shown, the long formats include: Format0, which supports a coverage area with a radius of 14.5 km; Format1, which supports a coverage area with a radius of 103 km; Format2, which supports a coverage area with a radius of 22 km; and Format3, which supports a coverage area with a radius of 14.5 km. Currently, Format0 is deployed for both TDD and FDD in ordinary access areas of the network. Format1 can be deployed for FDD in ultra-long-range cells. However, after deploying Format1 for TDD, PRACH access requires 3ms. With the current 7:3 uplink / downlink subframe ratio, only a continuous 1ms uplink time slot can be provided, which cannot meet the 3ms latency requirement. Therefore, the existing technology not only fails to meet the ultra-long-range coverage requirements of 5G but also fails to meet the latency requirements of PRACH access signals supporting ultra-long-range coverage.

[0042] This application provides a method for adjusting communication signals that can operate under the above-described operating environment. Figure 3 This is a flowchart of the steps of a communication signal adjustment method according to an embodiment of this application, as follows: Figure 3 As shown, the method includes the following steps:

[0043] Step S302: Obtain the deployment information of the base station and the time slot information of the base station in the time division duplex (TDD) communication mode, and determine the first protection time slot based on the deployment information and the time slot information. The deployment information includes at least: a preset signal coverage range, and the coverage range of the TDD communication signal of the first protection time slot is greater than or equal to the preset signal coverage range.

[0044] In step S302, the system for remotely managing the base station sends deployment information to the base station. This deployment information can be preset according to requirements and includes: the expected ultra-long coverage distance (i.e., the preset signal coverage range). The expected ultra-long coverage distance is the range that the TDD communication signal transmitted by the 5G base station in Time Division Duplex (TDD) communication mode is expected to cover. The TDD communication signal is the signal used to realize TDD communication between the base station and the terminal. After receiving the deployed information, the base station queries the time slot information of the signal used for TDD communication between the base station and the terminal. The time slot information includes the time slot ratio and time slot duration (uplink time slot duration, downlink time slot duration), etc. Based on the deployment information and the time slot information, the base station determines the protection time slot (i.e., the first protection time slot) that can meet the expected ultra-long coverage distance. After the base station adjusts the protection time slot of the TDD signal used for communication with the terminal to the aforementioned first protection time slot, the coverage range of the TDD communication signal is at least equal to the preset signal coverage range, thus meeting the requirement for ultra-long-distance coverage.

[0045] Optionally, the deployment information further includes: a first altitude of the base station and a second altitude of the terminal communicating with the base station via TDD; before determining the first protection time slot based on the deployment information and time slot information, the method includes: determining the line-of-sight distance based on the first altitude and the second altitude, wherein the line-of-sight distance is the distance between the base station and the farthest terminal, and the farthest terminal is located in the area corresponding to the signal coverage range of the base station; comparing the line-of-sight distance with a preset signal coverage range to obtain a comparison result; if the comparison result indicates that the line-of-sight distance is greater than or equal to the preset signal coverage range, determining the first protection time slot based on the deployment information and time slot information; if the comparison result indicates that the line-of-sight distance is less than the preset signal coverage range, rejecting the determination of the first protection time slot.

[0046] The ultra-long coverage distance of 5G is not only limited by the PRACH format and guard slot (GP), but also by the height of the transceiver and the power and demodulation capability of the service channel. Theoretically, the higher the height of the transceiver, the greater the coverage distance of the PRACH access signal. Furthermore, the curvature of the Earth affects the propagation of wireless signals. Under the influence of the Earth's curvature, the distance (d) between the base station and the terminal is related to the height (H) of the base station. t ) and the height of the terminal (H) r The following relationship exists between them: Among them, R e R represents the Earth's radius. e The speed is constant at 6367 km. Figure 4 This is a graph showing the relationship between base station height and line-of-sight height under the influence of the Earth's curvature. According to the formula above, the higher the base station, the greater its corresponding line-of-sight distance. Line-of-sight distance is the distance between the base station and the farthest terminal within its signal coverage area. In this embodiment, the coverage area is represented by the radius of the coverage area. Therefore, according to... Figure 4 The above formula corroborates that the higher the base station, the greater the coverage area of ​​the signal it transmits. In this embodiment, before adjusting the PRACH signal to become a (target) access signal capable of achieving ultra-long-distance coverage, the height of the base station and the terminal is used to determine whether the base station can adjust the original access signal to a target access signal with a signal coverage area greater than or equal to the preset signal coverage area. Specifically, firstly, according to formula L... s =√17(√H) t +√H r To determine the distance L between the base station and the farthest terminal s (i.e., line-of-sight distance), where H t (i.e., the first altitude) and H r (i.e., the second altitude) are all recorded in the deployment information. The aforementioned farthest terminal is the terminal furthest from the base station among the multiple terminals included in the base station's signal coverage area; the base station's signal coverage area is its current altitude (H). t The maximum range that can be covered, for example, according to Figure 4 As shown, if the current base station height is 30 meters (m) and the terminal height is 5 meters, then the base station's coverage area is a circle with a radius of 31.8 km. In this embodiment, the terminal height can be set to 5 meters by default, or it can be set according to the actual situation. Next, by comparing L... s To determine whether a base station can adjust the original access signal to the target access signal, a preset signal coverage range is used. In this embodiment, the radius L of the preset signal coverage range is used. p This represents the preset signal coverage area; therefore, it can be compared with L. p With L sDetermine the relationship between line-of-sight distance and preset signal coverage; if L p ≤L s The comparison result is as follows: if the line-of-sight distance is greater than or equal to the preset signal coverage range, it indicates that the preset signal coverage range is within the maximum coverage range that the base station's transmitted signal can cover. The base station can then adjust the original access signal to the target access signal. At this point, the (first) protection time slot of the PRACH access signal (i.e., the target access signal) that can cover the preset signal coverage range can be further determined based on deployment information and time slot information. If L p >L s If the comparison result is: the line-of-sight distance is less than the preset signal coverage range, it means that the preset signal coverage range is outside the maximum range that the signal transmitted by the base station can cover. No matter how the base station adjusts the original access signal, it cannot cover the preset signal range. At this time, signal adjustment is no longer performed, and there is no need to determine the first protection time slot.

[0047] According to an optional embodiment of this application, determining a first protection time slot based on deployment information and time slot information includes: determining the transmission format of the signal transmitted by the base station through the Physical Random Access Channel (PRACH) when the base station performs TDD communication based on the base station location information in the deployment information, wherein the base station location information is used to indicate the type of area where the base station is located, including: high-speed mobile area and non-high-speed mobile area, and the transmission format corresponding to different base station location information is different; determining the first protection time slot based on the transmission format, time slot information and preset signal coverage range in the deployment information.

[0048] The guard slot of the PRACH access signal determines its coverage range. To ensure that the coverage range of the PRACH access signal is greater than or equal to the preset signal coverage range, the total time domain length of the guard slots must be less than the duration of the continuous uplink slots. However, the duration of the continuous uplink slots differs for different transmission formats of the PRACH access signal. Therefore, in this embodiment, when determining the (first) guard slot of the signal that can cover the preset signal coverage range, it is necessary to determine the transmission format of the PRACH access signal (i.e., the signal transmitted via PRACH) used by the base station and the terminal for TDD communication based on the base station location information contained in the deployment information. The base station location information can be used to indicate the type of area where the base station is located. In this embodiment, the area where the base station is located is classified into two categories: high-speed mobile areas (such as base stations near high-speed rail) and non-high-speed mobile areas (scenarios not involving high-speed movement). The transmission format of the PRACH access signal used by the base station and the terminal for TDD communication differs in these two scenarios. If it is a high-speed mobile area, the transmission format of the PRACH access signal is... Figure 2 In Format3, if it is a non-high-speed mobile area, the transmission format of the PRACH access signal is as follows: Figure 2Format0 in the PRACH access signal. Furthermore, based on the format of the PRACH access signal, the received deployment information, and the time slot information, the base station can determine the (first) protection time slot that can cover the preset signal coverage area.

[0049] Optionally, the time slot information includes: a preset duration, a continuous uplink time slot duration, and a special time slot duration, wherein the preset duration is the length of each subframe in the TDD communication mode; determining the first protection time slot according to the transmission format, the time slot information, and the preset signal coverage in the deployment information includes: determining a first value interval according to the preset signal coverage and the preset duration; determining the access signal information corresponding to the transmission format, wherein the access signal information includes at least: a first length of each cyclic prefix CP and a second length of each preamble sequence SEQ; determining a second value interval according to the access signal information, the preset duration, the continuous uplink time slot duration, and the special time slot duration; if there is an intersection between the second value interval and the first value interval, determining any one of the multiple durations contained in the intersection as the target duration, and determining the protection time slot with a length of the target duration as the first protection time slot.

[0050] As mentioned in the above embodiments, the time slot information includes the time slot allocation and the time slot duration, wherein the time slot duration includes at least the length T of each subframe in the PRACH access signal (including the original access signal and the target access signal) under TDD communication mode. s The total duration T of multiple time slots (i.e., consecutive uplink time slots) between multiple uplink symbols arranged consecutively in the PRACH access signal (i.e., the preset length). u (i.e., the duration of continuous uplink time slots), and the total duration of multiple time slots in a special subframe (S). TDD communication systems have the following latency requirements: TDD communication systems need to ensure that the total time domain length of the three types of subframes—cyclic prefix (CP), preamble sequence (SEQ), and guard slot (GP)—is not less than the uplink transmission time slot duration T. u (i.e., the duration of continuous uplink time slots) and not greater than the sum of the duration of continuous uplink time slots and the duration of special uplink time slots, T. us (T us =T u +Special time slot duration), then in this embodiment, it should be ensured that the protection time slot (i.e., the first protection time slot) of the adjusted signal meets the above requirements, that is, the adjusted signal satisfies the formula: T u ≤(CP+SEQ+GP x )·T s ≤T us , among which, GP x The protection time slot representing the adjusted signal (i.e., the first protection time slot), (CP+SEQ+GP) x )·T sThis represents the guaranteed cyclic prefix (CP) and preamble sequence (SEQ) and first guard slot (GP). x The total temporal length of these three types of subframes. Additionally, as mentioned in the above embodiments, the preset signal coverage area (L) p It should be smaller than the maximum range that the adjusted signal can cover (i.e., the line-of-sight distance L). s ) that is, L p ≤L s ,because Therefore, the above three formulas can be used to determine which range the protection time slot (i.e., the first protection time slot) of the signal that can cover the preset signal coverage range should belong to, i.e., combining the formulas. The first protection time slot GP can then be determined. x The range of values ​​for , where C represents the speed of light. Representative to The result is rounded down. The number of subframes contained in SEQ and GP, or the length of CP (i.e., the first length) and the length of SEQ (i.e., the second length), can be determined by the transmission format of the PRACH signal. Figure 5 It is a record table of relevant information for different PRACH signals, such as Figure 5 As shown, the 3GPP protocol defines the length of the CP, the length of the (unadjusted) GP, the length of the SEQ, the duration of the PRACH access signal, and the coverage area (expressed as cell radius) of different PRACH signal formats. Therefore, after determining the transmission format of the PRACH access signal based on the base station location information in the deployment information, the lengths of the CP, GP, and SEQ in the PRACH access signal can be determined. Furthermore, the range of values ​​for the first guard time slot can be determined according to the above formula. This range is based on T... u ≤(CP+SEQ+GP x )·T s ≤T us The determined range of values ​​for the protection time slot (i.e., the second value interval) and based on The intersection of (i.e., the first value range) is used to determine the signal adjustment method of this embodiment. If such an intersection exists, the base station will continue to execute the signal adjustment method of this embodiment; otherwise, the base station will not continue to execute the method. The length of the first protection time slot can be any value within this range. Since a longer protection time slot results in a longer access time, in order to reduce the access time, this embodiment can also determine the minimum value in the range of values ​​for the first protection time slot as the length of the first protection time slot. For example, when the 5G TDD network subframe ratio is 7:3 dual-cycle, DDDSUDSUU, T u =1ms, T us =1.5ms, L s=41.7km, C=299792458m / s, T s = 1 / (15000*2048), and it is determined that the format of the PRACH access signal is Format0 based on the deployment information (i.e., the length of CP is 3168ms, the length of SEQ is 24576, and the length of GP is 2976). Substituting the above information into... It can be obtained (i.e., the first value interval), substitute the above information into T u ≤(CP+SEQ+GP x )·T s ≤T us We can get 2976≤GP x ≤18336, since these two ranges intersect at 6149≤GP x ≤18336 (i.e., the second value range), therefore, it is determined that the base station can adjust the original access signal to a signal that can cover the preset signal coverage range, and the protection time slot (i.e., the first protection time slot GP) of the signal that can cover the preset signal coverage range is determined. x The value of ) is in the interval [6149, 18336], when GP x When the length is 6149, the access delay of the adjusted PRACH access signal is the shortest, still as... Figure 5 As shown, the format of the PRACH signal with the shortest adjusted access delay is denoted as FormatX. The coverage range of the PRACH signal in FormatX format can be equal to the preset signal coverage range (L). p =30km), the length of CP remains 3168, the length of SEQ remains 24576, the length of GP is adjusted to 6149, and the duration of the PRACH signal is 1.1ms.

[0051] It should be noted that the length of communication signals, such as the TDD communication signals (including PRACH access signals) in the embodiments of this application, is expressed in terms of duration. For example, the length T of each subframe in the PRACH access signal in TDD communication mode is... s It can be 1 / (15000*2048) milliseconds, then the length of the PRACH access signal in TDD communication mode is the number of subframes and T. s The product of these is in the form of duration.

[0052] Step S304: Determine an adjustment strategy based on deployment information, the first protection time slot, and the second protection time slot of the original access signal. The adjustment strategy is used to adjust the proportion of multiple different symbols in the first target special subframe. The first target special subframe is a special subframe in the original access signal that is adjacent to the continuous uplink symbol sequence. The original access signal is a signal used to request access to the base station in TDD communication mode.

[0053] In the current network, the terminal sends a PRACH access signal (i.e., the original access signal) to the base station to request access to the base station for TDD communication. However, under the 3GPP protocol specification, the base station uses a 2.5ms dual-cycle 7:3 PRACH access signal for TDD communication with the terminal, which cannot meet the ultra-long-distance coverage requirements and the preset signal coverage range in the deployment information. Therefore, in step S304, the 2.5ms dual-cycle 7:3 PRACH access signal (i.e., the original access signal) needs to be adjusted. Specifically, in step S304, the base station determines an adjustment strategy to adjust the original access signal to meet the expected ultra-long-distance coverage requirements based on the deployment information, the first protection time slot, and the protection time slot (i.e., the second protection time slot) of the 3GPP-compliant PRACH access signal (i.e., the original access signal). Based on this adjustment strategy, the special subframe S (i.e., the first target special subframe) adjacent to the continuous uplink symbol sequence in the original access signal is adjusted so that the adjusted original access signal can meet the ultra-long-distance coverage requirements. In a PRACH access signal, there are usually multiple special subframes S. In this embodiment, when there are multiple special subframes S adjacent to a continuous uplink symbol sequence, the special subframe S adjacent to the continuous uplink symbol sequence containing the most uplink symbols is determined as the first target special subframe. For example, if the PRACH access signal is DDDSUDDSUU, the 9th S (the 3rd from the bottom) is determined as the first target special subframe.

[0054] Optionally, the second protection time slot is determined by the following method: when the base station location information indicates that the type of the area where the base station is located is a high-speed mobile area, the transmission format is determined to be the first transmission format, and the protection time slot corresponding to the first transmission format is determined to be the second protection time slot; when the base station location information indicates that the type of the area where the base station is located is a non-high-speed mobile area, the transmission format is determined to be the second transmission format, and the protection time slot corresponding to the second transmission format is determined to be the second protection time slot.

[0055] As mentioned in the above embodiments, the transmission format of the PRACH access signal used by the base station and the terminal during TDD communication before signal adjustment can be determined based on the location information of the base station in the deployment information. In this embodiment, the location information of the base station can be used to indicate the type of area where the base station is located, classifying the area into two categories: high-speed mobile areas (such as base stations near high-speed rail) and non-high-speed mobile areas (scenarios not involving high-speed movement). When the location information of the base station indicates that the base station is located in a high-speed mobile area, the transmission format of the PRACH access signal is determined to be... Figure 2 In Format3, at this time, Figure 5The GP (GP=2976) for the PRACH access signal in Format3, as recorded in the documentation, is the second guard time slot; if the base station's location information indicates that the base station is located in a non-high-speed mobile area, then the transmission format of the PRACH access signal is determined to be... Figure 2 In Format0, at this time, Figure 5 The GP (GP=2976) when the PRACH access signal is Format0 as recorded in the document is the second protection time slot.

[0056] According to an optional embodiment of this application, determining an adjustment strategy based on deployment information, a first protection time slot, and a second protection time slot of the original access signal includes: determining a third length for each uplink symbol in the original access signal; determining a first value based on the first protection time slot, the second protection time slot, the third length, and the length of each subframe in the TDD communication mode contained in the time slot information, wherein the first value is the number of uplink symbols contained in the first target special subframe after adjusting the first target special subframe according to the adjustment strategy; determining a second value based on a preset signal coverage area, a preset response time, and the third length in the deployment information, wherein the preset response time is the response time of the terminal communicating with the base station under TDD, and the second value is the number of protection symbols contained in the first target special subframe after adjusting the first target special subframe according to the adjustment strategy; determining a third value based on the first value, the second value, and the total number of symbols contained in the first target special subframe, wherein the third value is the number of downlink symbols contained in the first target special subframe after adjusting the first target special subframe according to the adjustment strategy; and determining the proportional sequence determined by the first value, the second value, and the third value as the adjustment strategy.

[0057] The method provided in this application adjusts the ratio of multiple symbols (uplink symbol U, downlink symbol D, and special subframe symbol S) in a special subframe (S) of the PRACH access signal to make the coverage range of the adjusted PRACH access signal different from that of the original PRACH access signal (i.e., the original access signal). In this embodiment, uplink symbols are selected in the special subframe as supplements to the uplink time slots, and the ratio of multiple symbols in the special subframe (S) is adjusted by adding more uplink symbols. Adding uplink symbols to the special subframe first requires determining how many uplink symbols should be added to the special subframe (S). In this embodiment, the formula is used... After the uplink symbols are added, the number of uplink symbols contained in the special subframe (S) (i.e., the first value NUM) is determined. x ),in, Representative to Round the result up, T symbol Represents the length of each uplink symbol in the original access signal (i.e., the third length), GPx That is, the first protection time slot, GP y This represents the second protection time slot, where, if the original access signal format is Format0, then GP y =GP0 (by Figure 5 It can be known that it is 2976); if the original access signal format is Format3, then GP y =GP3 (by Figure 5 It is known that it is 2976), T s NUM is the length of each subframe in TDD communication as specified by the 3GPP protocol (expressed in terms of duration); x The difference between the number of uplink symbols (U) in the special subframe of the original access signal and the number of uplink symbols to be added is the number of uplink symbols to be added. During the adjustment process, it is necessary to ensure that the total number of various symbols in the special subframe remains unchanged. Therefore, after adding uplink symbols to the special subframe (S), the number of special subframe symbols (S) and downlink symbols (D) in the special subframe also needs to be adjusted. Specifically, when determining the adjustment method for special symbols (i.e., special subframe symbols S), the presence of special symbols in the special subframe is considered. Since the more special symbols there are and the longer the time, the greater the corresponding coverage distance, the more special symbols GP are contained in the special subframe. y (i.e., the number of special subframe symbols S, the second value) and the guard slot is GP. y The maximum coverage area supported by the signal (using radius L) y (to indicate) the following relationship existed before: Among them, T ue (i.e., preset response time) represents the conversion time from downlink reception to uplink transmission for the terminal. This value is related to the accuracy of the terminal's transmission power and is typically between 10 microseconds (μs) and 40 μs. Therefore, according to... The resulting GP y To adjust the number of protection symbols (i.e., the number of special subframe symbols S) contained in the special subframe, the total number (N) of the multiple symbols contained in the special subframe in the original access signal minus NUM is calculated. x Subtract GP y This refers to the number of downlink symbols contained in the special subframes of the adjusted PRACH access signal (i.e., the third value). In this embodiment, the number of uplink symbols contained in the special subframes after signal adjustment is the first value, the number of guard symbols is the second value, and the number of downlink symbols is the third value. The ratio sequence generated by these three values ​​is determined as the adjustment strategy. Figure 6 This is a diagram illustrating the adjustment of the original access signal. For example, such as... Figure 6 As shown, the original access signal is a 5G TDD network subframe ratio of 7:3 with dual cycles, namely DDDSDUDDSUU (see...). Figure 6In sequence ①), the first target special subframe (see...) Figure 6 In sequence ②), the number of uplink symbols (U) is 2, the number of guard symbols (S) is 4, and the number of downlink symbols (D) is 8. That is, the ratio of various symbols in the special subframe of the original signal is 8:4:2, and the preset signal coverage area L p =30km, speed of light C=299792458m / s, preset response time T ue =20μs, 7:3 dual-cycle, one slot length is 0.5ms, one symbol length is T symbol = 0.5 / 14ms. The original access signal format is Format3, and its GP length is 2976ms. Therefore, according to... It can be confirmed NUM x The value can be taken from the interval [3, N (the total number of symbols contained in the special subframe in the original access signal)]. For example, it can be 3. In this case, according to... Determine GP y Should meet Substitute L p =30km, C=299792458m / s and T ue =20μs can be obtained That is, the number of protection symbols in the special subframes of the adjusted signal must be at least 7; if the total number of various symbols in the special subframes of the original access signal is 14, then the number of downlink symbols in the special subframes of the adjusted signal is 14-3-7=4; therefore, the ratio sequence in the adjustment strategy is "4 downlink symbols: 7 special symbols: 3 uplink symbols" (see...). Figure 6 In sequence ③), the adjusted signal, relative to the original access signal, only changes the ratio of the various symbols contained within the special subframe S, from 8:4:2 to "4:7:3", while other parts remain unchanged (see [link to original signal]). Figure 6 sequence in ④).

[0058] Step S306: Adjust the original access signal according to the adjustment strategy to generate a target access signal, wherein the coverage range of the target access signal is greater than the coverage range of the original access signal.

[0059] In step S306, the time slot information of the PRACH access signal (i.e., the original access signal) conforming to the 3GPP protocol is adjusted according to the adjustment strategy determined in step S304. The adjusted signal is the PRACH access signal (i.e., the target access signal) that can meet the ultra-long-distance coverage requirements. The protection time slot of the target access signal can be the first protection time slot in step S202, or it can be other protection time slots in the same time slot interval as the first protection time slot. Since the original access signal (i.e., the target access signal) adjusted according to the adjustment strategy can meet the ultra-long-distance coverage requirements, while the original access signal cannot meet the ultra-long-distance coverage requirements, it is obvious that the coverage range of the target access signal is greater than that of the original access signal.

[0060] Optionally, adjusting the original access signal according to the adjustment strategy to generate the target access signal includes: adjusting the first target special subframe contained in the original access signal according to the adjustment strategy to obtain the target access signal, wherein the proportion of various symbols contained in the first target special subframe after adjustment according to the adjustment strategy is the proportion indicated by the adjustment strategy.

[0061] In this embodiment, the internal structure of the special subframe (i.e., the first target special subframe) adjacent to the continuous uplink symbol sequence in the original access signal is adjusted according to the adjustment strategy determined in step S304. The proportion of the various symbols (uplink symbol U, downlink symbol D, and guard symbol S) contained in the first target special subframe is adjusted to the proportion indicated by the adjustment strategy. That is, after the first target special subframe in the original access signal is adjusted to the second target special subframe, the original access signal becomes the target access signal.

[0062] After generating the target access signal, its access time-domain information is sent to the terminal, enabling the terminal to access the base station via the target access signal the next time. This access time-domain information includes: the symbol indicating the start of access, the symbol indicating the end of access, and the types and number of symbols included in the access signal, for example... Figure 6 As shown, in this embodiment, the signal used for access in the original access signal (i.e., PRACH access) is the sequence of the last two uplink symbols (U); the signal used for access in the modified signal (i.e., the newly generated PRACH access) is the sequence of the last five uplink symbols (U).

[0063] Optionally, after generating the target access signal, the method includes: determining whether there is interference between the target access signal and the original access signal based on a first target special subframe and a second target special subframe, and obtaining a determination result, wherein the second target special subframe is a special subframe in the target access signal that is adjacent to a continuous uplink symbol sequence; if the determination result indicates that there is interference between the target access signal and the original access signal, determining an avoidance strategy corresponding to the interference type, wherein the interference type includes: downlink transmission interference and service interference, and different interference types correspond to different avoidance strategies; and executing the interference avoidance strategy.

[0064] The method provided in this application embodiment can also avoid time slot interference between the adjusted PRACH signal (i.e., the target access signal) and other signals in the existing network, or between other base stations and terminals when performing TDD communication and the unadjusted PRACH access signal (i.e., the original access signal). Specifically, it is necessary to first determine whether time slot interference may exist. Specifically, in this embodiment, the existence of time slot interference is determined by jointly using the special subframe (i.e., the second target special subframe) adjacent to the continuous uplink symbol sequence in the target access signal and the first target special subframe in the original access signal. Since the adjustment strategy in this embodiment is used to adjust the proportion of multiple different symbols (uplink symbol U, downlink symbol D, and special subframe symbol S) in the first target special subframe, the target access signal is only different from the original access signal in that the internal structure of the special subframe has changed. Therefore, the second target special subframe is the first target special subframe adjusted according to the adjustment strategy. The arrangement of multiple subframes in the target access signal is exactly the same as the arrangement of these multiple subframes in the original access signal. For example, if the original access signal is DDDSUDSUU, then the target access signal is also DDDSUDSUU. The target special subframe of the original access signal (i.e., the first target special subframe) is the 9th S (from left to right) (the 3rd S from the bottom) and the target special subframe of the target access signal (i.e., the second target special subframe) is also the 9th S (from left to right) (the 3rd S from the bottom). However, the internal information of the first target special subframe and the second target special subframe is completely different. If a second target special subframe is determined solely within the target access signal, the following method is used: If multiple special subframes S exist in the original access signal, then multiple special subframes S also exist in the adjusted PRACH access signal (i.e., the target access signal). In this embodiment, when multiple special subframes S adjacent to a continuous uplink symbol sequence exist in the target access signal, the special subframe S adjacent to the continuous uplink symbol sequence containing the most uplink symbols is determined as the second target special subframe. For example, if the PRACH access signal is DDDSUDDSUU, the 9th S (from left to right) is determined as the second target special subframe. Since multiple terminals interact with a base station, although the PRACH access signal used for interaction between the base station and one / multiple terminals is adjusted according to the method provided in this application embodiment, other signal sources within the base station's coverage area may still perform TDD communication with neighboring cells of the base station through the original access signal. Therefore, it is necessary to determine whether time slot interference exists between these two types of signals (i.e., the original access signal and the target access signal).In this embodiment, the impact of time slot interference on services is divided into two types: downlink data transmission interference and downlink service interference. Data transmission interference refers to interference with downlink data transmission, while service interference refers to interference with services related to downlink transmission. Different avoidance strategies are set for different types of interference in this embodiment, but the common feature of these different avoidance strategies is to avoid the base station from transmitting downlink symbols (D) to the terminal at the time when time slot interference occurs.

[0065] According to an optional embodiment of this application, determining whether there is interference between the target access signal and the original access signal based on a first target special subframe and a second target special subframe, and obtaining a determination result, includes: determining a first time corresponding to each downlink symbol in the first target special subframe, and determining a second time corresponding to each uplink symbol in the second target special subframe; if any first time and any second time are the same, the determination result is that there is interference between the target access signal and the original access signal; if there are no identical first time and second time, the determination result is that there is no interference between the target access signal and the original access signal.

[0066] As mentioned in the previous embodiment, in this embodiment, the existence of time slot interference is determined based on the first target special subframe in the original access signal and the second target special subframe in the target access signal. Specifically, in this embodiment, the time corresponding to each downlink symbol D in the first target special subframe (i.e., the first time) is determined, which is the time when the terminal requests the base station to send downlink resources; at the same time, the time corresponding to each uplink symbol U in the second target special subframe (i.e., the second time) is determined, which is the time when the terminal requests the base station to send uplink resources. As can be seen from the above, different symbols are used to indicate that the base station sends different resources. Therefore, when a terminal requests through the original access signal... The timing of the base station issuing downlink resources differs from the timing of another terminal requesting uplink resources from the base station via the target access signal. Since the difference between the original access signal and the target access signal lies only within the first and second target special subframes, and the original signal itself does not have time slot interference (there is no situation where both uplink and uplink resources are requested at the same time), it is only necessary to determine whether time slot interference exists by judging whether the timing corresponding to the downlink symbol in the first target special subframe (i.e., the first timing) is the same as the timing corresponding to the uplink symbol U in the second target special subframe (i.e., the second timing). If the first timing and the second timing are the same, it means that two different base stations are requesting different resources from the base station at the same time via the original access signal and the target access signal, respectively, and time slot interference exists. In this case, since the purpose of this embodiment is to enable the signal transmitted by the base station to cover ultra-long distances, in order to ensure that the base station can meet the ultra-long distance coverage requirements, an avoidance strategy is implemented to avoid services related to downlink resources; otherwise, if the first timing and the second timing are different, there is no time slot interference.

[0067] Optionally, the interference avoidance strategy includes: in the case of downlink transmission interference, executing a first interference avoidance strategy, wherein the first interference avoidance strategy is used to instruct the base station to prohibit downlink transmission at a target time, the target time being the time when the base station simultaneously transmits downlink symbols in a first target special subframe and uplink symbols in a second target special subframe; in the case of service interference, executing a second interference avoidance strategy, wherein the second interference avoidance strategy is used to instruct the base station to stop service scheduling with neighboring cells, the neighboring cells being cells that communicate with signal sources within the coverage area of ​​the target access signal but are not within the coverage area of ​​the target access signal.

[0068] In this embodiment, when it is determined that there is time slot interference between the original access signal and the target access signal, an avoidance strategy corresponding to the type of interference is executed to avoid the time slot interference between the original access signal and the target access signal. Specifically, in this embodiment, the strategy for avoiding downlink data transmission interference (i.e., downlink transmission interference) is denoted as the first interference avoidance strategy, and the strategy for avoiding downlink service interference (i.e., service interference) is denoted as the second interference avoidance strategy. When the type of time slot interference between the original access signal and the target access signal is downlink transmission interference, it means that the time (i.e., the first time) corresponding to the downlink symbol (D) in the first target special subframe of the original access signal sent by a certain base station, which is used to request the base station to send downlink resources (for downlink data transmission), is the same time (i.e., the target time) as the time (i.e., the second time) corresponding to the uplink symbol (U) in the second target special subframe of the target access signal sent by another base station, which is used to request the base station to send uplink resources. In this case, the base station executes the first interference avoidance strategy: prohibits itself from performing downlink transmission through downlink resources at the above-mentioned target time. When the time slot interference between the original access signal and the target access signal is service interference, the time corresponding to the downlink symbol (D) in the first target special subframe of the original access signal sent by one base station (i.e., the first time) for requesting the base station to issue downlink resources (for supporting downlink services) and the time corresponding to the uplink symbol (U) in the second target special subframe of the target access signal sent by another base station (i.e., the second time) for requesting the base station to issue uplink resources are the same time (i.e., the target time). Then, the base station executes the second interference avoidance strategy: prohibiting itself from performing downlink service scheduling with neighboring cells at the above-mentioned target time (all services implemented by the base station to send data to the terminal are downlink services). The above-mentioned neighboring cells are cells that need to be scheduled and avoided. Cells that interact with information sources within the coverage area of ​​the adjusted original access signal (i.e., the target access signal) but are not within the coverage area of ​​the target access signal are called the base station's neighboring cells. Figure 7 It is a schematic diagram composed of symbols of multiple access signals with different coverage areas, such as... Figure 7 As shown, the first column is formatted as Format0, and supports a coverage range of L. p The original access signal has a range of 14.5 km. After adjusting the original access signal according to the method provided in the embodiments of this application, the coverage range is L. p =550 target access signal, with L p Taking L = 550 as an example, according to the above embodiment, when L p When NUM = 550, x 101, GP y It is 104, such as Figure 7 As shown, the original access signal and L pThe times when interference exists between the target access signals of =550 are: the times corresponding to symbol 39, the times corresponding to symbols 40-43, the times corresponding to symbols 44-47, the times corresponding to symbols 48-49, and the times corresponding to symbols 70-105 (L). p When the uplink symbol U in the target access signal of 550 is in the same column as the downlink symbol D in the original access signal, it is still as follows: Figure 7 As shown, since the original access signal transmits downlink data via the synchronization signal (SSB) at the times corresponding to symbol 39 and symbols 44-47, it is determined that there is SSB transmission interference (i.e., downlink data transmission interference) between the original access signal and the target access signal at the times corresponding to symbol 39 and symbols 44-47. Therefore, the base station executes the first interference avoidance strategy at the times corresponding to symbol 39 and symbols 44-47, for example, adjusting the original SSB beam from 11111110 to 11111000, where 1 represents executing downlink data transmission and 0 represents not executing downlink data transmission. As before... Figure 7 As shown, the times when time slot interference exists also include: the times corresponding to symbols 40-43, symbols 48-49, and symbols 70-105. Since the original access signal does not transmit downlink data through the SSB during these times, the type of time slot interference between the original access signal and the target access signal during these times is service scheduling interference. At this time, the base station executes a second interference avoidance strategy, selecting neighboring cells of the base station during the times corresponding to symbols 40-43, symbols 48-49, and symbols 70-105, and stopping downlink scheduling for the base station's neighboring cells during these times (times corresponding to symbols 40-43, symbols 48-49, and symbols 70-105). If L... p Taking L = 90 as an example, according to the above embodiment, when L p =90, NUM x 15, GP y It is 18, such as Figure 7 As shown, L p There is no SSB interference (i.e. downlink data transmission interference) between the target access signal and the original access signal at 90, but there is service interference at the times corresponding to symbols 97-105. Therefore, the base station executes the second interference avoidance strategy at the times corresponding to symbols 97-105: stop downlink scheduling of neighboring cells at these target times (times corresponding to symbols 97-105).

[0069] Through the above steps, the limitations of the PRACH format in the 3GPP protocol can be broken, and 5G ultra-long-range access signals can be flexibly generated for different TDD frame structures and ultra-long-range coverage requirements. Furthermore, based on the newly generated 5G ultra-long-range access signals, the main station and neighboring stations can be distinguished, and SSB avoidance and scheduling avoidance methods can be applied to avoid the time slot interference problem between the newly generated 5G ultra-long-range access signals (i.e., target access signals) and the original access signals.

[0070] Figure 8 This is a structural diagram of a communication signal adjustment device according to an embodiment of this application, such as... Figure 8 As shown, the communication signal adjustment device includes: an acquisition module 80, used to acquire the deployment information of the base station and the time slot information of the base station in the time division duplex (TDD) communication mode, and determine a first protection time slot based on the deployment information and the time slot information, wherein the deployment information includes at least: a preset signal coverage range, and the coverage range of the TDD communication signal with the first protection time slot being greater than or equal to the preset signal coverage range; a determination module 82, used to determine an adjustment strategy based on the deployment information, the first protection time slot, and the second protection time slot of the original access signal, wherein the adjustment strategy is used to adjust the proportion of multiple different symbols in a first target special subframe, the first target special subframe being a special subframe in the original access signal adjacent to a continuous uplink symbol sequence, and the original access signal being a signal used to request access to the base station in the TDD communication mode; and a generation module 84, used to adjust the original access signal according to the adjustment strategy to generate a target access signal, wherein the coverage range of the target access signal is greater than the coverage range of the original access signal.

[0071] Figure 9 This is a flowchart of the operation of the communication signal adjustment device, such as... Figure 9 As shown, the communication signal adjustment device starts working, acquiring the base station deployment information (including preset signal coverage area, base station location information, base station altitude, etc.) through the acquisition module 80, and acquiring the time slot information (including time slot ratio, time slot duration, etc.) of the PRACH access signal used by the base station and the terminal for TDD communication. After acquiring the above information, the adjustment is performed using the formula... To determine whether a base station supports signals that can cover a preset signal coverage area (i.e., 5G ultra-long-range access signals), specifically, L, representing the maximum signal coverage area of ​​the base station... s L represents the preset signal coverage range p To make a comparison, if L p ≤L s If L is true, then the base station supports generating 5G ultra-long-range access signals; otherwise, if L is true... p >L sIf the base station does not support generating 5G ultra-long-range access signals, then the protection time slot (i.e., the first protection time slot) of the 5G ultra-long-range access signal is determined based on the acquired deployment information and time slot information. Specifically, the format of the PRACH access signal used by the base station to communicate with the terminal is determined based on the location information of the base station contained in the base station's deployment information. Based on the length of the CP, the length of the SEQ, other TDD communication information, and the conditions that TDD system communication needs to meet, a range of values ​​for the deployment information is determined. The value range of the deployment time slot contains multiple values, all of which can be used as the value of the first protection time slot. To reduce latency, the smallest value among the multiple values ​​contained in the value range can be used as the value of the first protection time slot. Next, the determining module 82 determines the protection time slot (i.e., the second protection time slot) of the original access signal when the base station and the terminal conduct TDD communication, based on the deployment information obtained by the acquiring module 80, the location information of the base station, and the first protection time slot output by the acquiring module 80, and determines an adjustment strategy to adjust the original access signal to a 5G ultra-long-range access signal (i.e., the target access signal). The adjustment strategy is used to indicate the adjustment of the proportion of multiple symbols contained in the first target special subframe. The generating module 84 selects a special subframe for continuous uplink expansion (i.e., the first target special subframe) in the original access signal, and according to the adjustment strategy, calculates the number of each type of symbol (uplink symbol U, downlink symbol D, and special symbol S) contained in the first target special subframe, so that the proportion of multiple symbols contained in the first target special subframe is adjusted to the proportion indicated by the adjustment strategy. The original access signal adjusted according to the adjustment strategy is the 5G ultra-long-range access signal (i.e., the target access signal). In addition, after generating the target access signal, the communication signal adjustment device also generates access time-domain information of the target access signal (including the start access symbol, the number of symbols included in the PRACH access, etc.), and sends the generated access timing information to the terminal, so that the terminal accesses the base station with the target access signal for subsequent TDD communication; the communication signal adjustment device can also verify whether the target access signal can cover the preset signal coverage range and whether an avoidance strategy needs to be implemented, for example, based on the (first) protection time slot GP selected in the value range. x Using the formula L=GP x ·C·T s / (2·1000) Determine the coverage range L of the target access signal. If L is greater than or equal to the preset signal coverage range L p The target signal was confirmed to meet the ultra-long-range coverage requirement, and the verification was successful; if L is less than the preset signal coverage range L... p The target signal was determined not to meet the ultra-long-range coverage requirements, and the verification failed. For example... Figure 9As shown, when the target access signal verification is successful, the communication signal adjustment device determines whether slot interference exists based on the ratio of special subframes of the target access signal (second target) (i.e., the new subframe ratio) and the ratio of special subframes of the original access signal (first target) (i.e., the atomic frame ratio). If it exists, an avoidance strategy corresponding to the interference type needs to be selected to avoid interference on the symbols / slots that need to be avoided. Among them, slot interference has two types: downlink data transmission interference (i.e., SSB interference) and service scheduling interference. If the type of slot interference is downlink data transmission interference (i.e., SSB interference), the first interference avoidance strategy (SSB avoidance strategy) is executed: the base station sends symbols that will cause SSB interference. If the type of slot interference is service interference, the second interference avoidance strategy (scheduling avoidance strategy) is executed: the base station stops sending symbols that will cause service interference.

[0072] Figure 10 This is a record table of access signals corresponding to different expected coverage areas. To verify the method provided in this application embodiment, related experiments were conducted. Different coverage areas were used as preset signal coverage areas, and different access signals were generated according to the method provided in this application embodiment. The base station itself can perform TDD communication with the terminal through access signals in Format0 / Format1 / Format2 / Format3 formats. During the experiment, the access signal in Format0 format was used as the original access signal. The access signal in Format0 format was adjusted using the method provided in this application embodiment to obtain the following... Figure 10 The diagram shows various (target) access signals corresponding to different signal coverage areas, such as... Figure 10 As shown, since the protection time slot needs to be adjusted during the adjustment process, the adjusted access signal (coverage range L) p =30km~280km, L p =550km access signal) Compared to the original access signal, besides the change in coverage (which can be represented by cell radius), the protection term (GP) and the access duration (PRACH duration) have also changed. During signal adjustment, it is necessary to adjust the number of uplink symbols and the number of protection symbols contained within a special subframe S adjacent to the continuous uplink symbol sequence. Therefore, the number of uplink symbols (NUM) contained in the adjusted access signal... x ) and the number of protection symbols (GP) y ) has also changed.

[0073] It should be noted that, Figure 8 Preferred embodiments of the shown examples can be found in [reference needed]. Figure 3 The relevant descriptions of the embodiments shown will not be repeated here.

[0074] It should be noted that each module in the above-mentioned communication signal adjustment device can be a program module (for example, a set of program instructions to implement a certain function) or a hardware module. For the latter, it can be manifested in the following forms, but is not limited to them: each of the above modules is manifested as a processor, or the functions of each of the above modules are implemented by a processor.

[0075] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0076] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0077] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0078] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0079] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0080] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0081] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for adjusting a communication signal, characterized in that, Applications to adjusting communication signals for 5G base stations include: The deployment information of the base station and the time slot information of the base station in the time division duplex (TDD) communication mode are obtained, and a first protection time slot is determined according to the deployment information and the time slot information. The deployment information includes at least a preset signal coverage range, and the protection time slot is such that the coverage range of the TDD communication signal of the first protection time slot is greater than or equal to the preset signal coverage range. An adjustment strategy is determined based on the deployment information, the first protection time slot, and the second protection time slot of the original access signal. The adjustment strategy is used to adjust the proportion of multiple different symbols in the first target special subframe. The first target special subframe is a special subframe in the original access signal that is adjacent to a continuous uplink symbol sequence. The original access signal is a signal used to request access to the base station in the TDD communication mode. Adjusting the original access signal according to the adjustment strategy includes: supplementing the number of uplink symbols in the first target special subframe to generate a target access signal, wherein the coverage range of the target access signal is greater than the coverage range of the original access signal, the multiple subframes included in the target access signal are the same as the multiple subframes included in the original access signal, and the multiple subframes are arranged in the same way in the target access signal and the original access signal.

2. The method according to claim 1, characterized in that, The deployment information also includes: the first altitude of the base station and the second altitude of the terminal communicating with the base station via TDD; Before determining the first protection time slot based on the deployment information and the time slot information, the method includes: The line-of-sight distance is determined based on the first altitude and the second altitude, wherein the line-of-sight distance is the distance between the base station and the farthest terminal, and the farthest terminal is located in the area corresponding to the signal coverage range of the base station; The line-of-sight distance is compared with the preset signal coverage area to obtain the comparison result; If the comparison result indicates that the line-of-sight distance is greater than or equal to the preset signal coverage range, the first protection time slot is determined based on the deployment information and the time slot information; If the comparison result indicates that the line-of-sight distance is less than the preset signal coverage range, the first protection time slot is rejected.

3. The method according to claim 1, characterized in that, Determining the first protection time slot based on the deployment information and the time slot information includes: The transmission format of the signal transmitted by the base station through the Physical Random Access Channel (PRACH) when the base station performs TDD communication is determined based on the base station location information in the deployment information. The base station location information is used to indicate the type of the area where the base station is located. The type includes: high-speed mobile area and non-high-speed mobile area. The transmission format is different for different base station location information. The first protection time slot is determined based on the transmission format, the time slot information, and the preset signal coverage range in the deployment information.

4. The method according to claim 3, characterized in that, The time slot information includes: preset duration, continuous uplink time slot duration, and special time slot duration, wherein the preset duration is the length of each subframe in the TDD communication mode; Determining the first protection time slot based on the transmission format, the time slot information, and the preset signal coverage range in the deployment information includes: The first value range is determined based on the preset signal coverage area and the preset duration; Determine the access signal information corresponding to the transmission format, wherein the access signal information includes at least: a first length of each cyclic prefix CP and a second length of each preamble sequence SEQ; The second value range is determined based on the access signal information, the preset duration, the continuous uplink time slot duration, and the special time slot duration. When there is an intersection between the second value interval and the first value interval, any one of the multiple durations contained in the intersection is determined as the target duration, and the protection time slot with a length of the target duration is determined as the first protection time slot.

5. The method according to claim 3, characterized in that, The second protection time slot is determined by the following method: When the base station location information indicates that the type of the area where the base station is located is the high-speed mobile area, the transmission format is determined to be the first transmission format, and the protection time slot corresponding to the first transmission format is determined to be the second protection time slot; If the base station location information indicates that the type of the area where the base station is located is the type of the non-high-speed mobile area, the transmission format is determined to be the second transmission format, and the protection time slot corresponding to the second transmission format is determined to be the second protection time slot.

6. The method according to claim 1, characterized in that, The adjustment strategy is determined based on the deployment information, the first protection time slot, and the second protection time slot of the original access signal, including: Determine the third length of each uplink symbol in the original access signal; A first value is determined based on the first protection time slot, the second protection time slot, the third length, and the length of each subframe in the TDD communication mode contained in the time slot information. The first value is the number of uplink symbols contained in the first target special subframe after adjusting the first target special subframe according to the adjustment strategy. The second value is determined based on the preset signal coverage range, preset response time and the third length in the deployment information, wherein the preset response time is the response time of the terminal that performs the TDD communication with the base station, and the second value is the number of protection symbols contained in the first target special subframe after the first target special subframe is adjusted according to the adjustment strategy. A third value is determined based on the first value, the second value, and the total number of symbols contained in the first target special subframe, wherein the third value is the number of downlink symbols contained in the first target special subframe after adjusting the first target special subframe according to the adjustment strategy. The ratio sequence determined by the first value, the second value, and the third value is used as the adjustment strategy.

7. The method according to claim 1, characterized in that, The original access signal is adjusted according to the adjustment strategy to generate a target access signal, including: The first target special subframe contained in the original access signal is adjusted according to the adjustment strategy to obtain the target access signal, wherein the proportion of various symbols contained in the first target special subframe after adjustment according to the adjustment strategy is the proportion indicated by the adjustment strategy.

8. The method according to claim 1, characterized in that, After generating the target access signal, the method includes: Based on the first target special subframe and the second target special subframe, it is determined whether there is interference between the target access signal and the original access signal, and a determination result is obtained. The second target special subframe is a special subframe in the target access signal that is adjacent to a continuous uplink symbol sequence. If the judgment result indicates that there is interference between the target access signal and the original access signal, an avoidance strategy corresponding to the interference type is determined, wherein the interference type includes: downlink transmission interference and service interference, and different interference types correspond to different avoidance strategies; Implement the aforementioned evasion strategy.

9. The method according to claim 8, characterized in that, Based on the first target special subframe and the second target special subframe, it is determined whether there is interference between the target access signal and the original access signal, and the determination result is obtained, including: Determine the first time corresponding to each downlink symbol in the first target special subframe, and determine the second time corresponding to each uplink symbol in the second target special subframe; If any of the first moments and any of the second moments are the same, the determination result is that there is interference between the target access signal and the original access signal; In the absence of identical first and second moments, the determination result is that there is no interference between the target access signal and the original access signal.

10. The method according to claim 8, characterized in that, Executing the evasion strategy includes: When the interference type is downlink transmission interference, a first interference avoidance strategy is executed, wherein the first interference avoidance strategy is used to instruct the base station to prohibit downlink transmission at a target time, the target time being the time when the base station simultaneously transmits downlink symbols in the first target special subframe and uplink symbols in the second target special subframe; In the case where the interference type is the service interference, a second interference avoidance strategy is executed, wherein the second interference avoidance strategy is used to instruct the base station to stop service scheduling with neighboring cells, wherein the neighboring cells are cells that communicate with a source within the coverage area of ​​the target access signal but are not within the coverage area of ​​the target access signal.

11. A communication signal adjustment device, characterized in that, Applications to adjusting communication signals for 5G base stations include: The acquisition module is used to acquire the deployment information of the base station and the time slot information of the base station in the time division duplex (TDD) communication mode, and determine the first protection time slot according to the deployment information and the time slot information. The deployment information includes at least: a preset signal coverage range, and the protection time slot is the coverage range of the TDD communication signal of the first protection time slot is greater than or equal to the preset signal coverage range. The determining module is used to determine an adjustment strategy based on the deployment information, the first protection time slot, and the second protection time slot of the original access signal. The adjustment strategy is used to adjust the proportion of multiple different symbols in the first target special subframe. The first target special subframe is a special subframe in the original access signal that is adjacent to a continuous uplink symbol sequence. The original access signal is a signal used to request access to the base station in the TDD communication mode. The generation module is used to adjust the original access signal according to the adjustment strategy, including: supplementing the number of uplink symbols in the first target special subframe to generate a target access signal, wherein the coverage range of the target access signal is greater than the coverage range of the original access signal, the multiple subframes included in the target access signal are the same as the multiple subframes included in the original access signal, and the multiple subframes are arranged in the same way in the target access signal and the original access signal.

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