A multi-operator carrier tracking method and apparatus for a distributed antenna system

Abstract

The application provides a multi-operator carrier tracking method and device of a distributed antenna system, and comprises the following steps: acquiring a carrier tracking mode of a user terminal; when it is detected that a currently configured carrier signal cannot be locked, information of a next candidate carrier is acquired according to the carrier tracking mode, and the user terminal is reconfigured from the current carrier to the next candidate carrier according to the information of the next candidate carrier; if the user terminal cannot lock the configured candidate carrier, the above process is repeated until a lockable candidate carrier is found. When it is detected that a signal of a currently configured operator base station is abnormal, the user terminal is automatically switched to a carrier of another normal operator, so that the continuity of signal coverage is ensured, and the use experience of users is improved.

Description

Technical Field

[0001] This invention relates to carrier tracking technology, and more particularly to a multi-operator carrier tracking method and apparatus for a distributed antenna system. Background Technology

[0002] A Distributed Antenna System (DAS) is a mobile communication network constructed within a predetermined space or building, consisting of multiple spatially separated antenna nodes connected to multiple signal sources through various signal transmission media. A DAS can support multiple operators, multiple standards, and multiple carriers.

[0003] During the operation of a distributed antenna system, when multiple operators' signals are connected to the system, the complex and unstable network conditions may cause some operators' base station signals to malfunction, affecting signal stability and coverage, and impacting access for some users and the user experience for others. Therefore, how to automatically switch users to other working operators to achieve normal signal coverage when some operators' base stations malfunction is a problem worth solving. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-carrier carrier tracking method and apparatus for a distributed antenna system, which can solve the problem of abnormal signals from some on-network operator base stations affecting network coverage.

[0005] The technical solution provided by this invention is as follows:

[0006] A multi-carrier carrier tracking method for a distributed antenna system includes:

[0007] Obtain the carrier tracking mode of the user terminal;

[0008] When it is detected that the currently configured carrier signal cannot be locked, the information of the next candidate carrier is obtained according to the carrier tracking mode, and the user terminal is reconfigured from the current carrier to the carrier corresponding to the information of the next candidate carrier; if the user terminal cannot lock the signal of the configured candidate carrier, the above process is repeated until a candidate carrier that can be locked is found.

[0009] In some embodiments, before obtaining information about the next candidate carrier, the method includes: setting the carrier tracking mode to automatic mode and pre-setting information about N carriers;

[0010] The step of obtaining the information of the next candidate carrier according to the carrier tracking mode includes: if the carrier tracking mode is automatic mode, then selecting the next candidate carrier from the preset N carriers.

[0011] In some embodiments, when it is detected that the currently configured carrier signal cannot be locked, obtaining information about the next candidate carrier according to the carrier tracking mode includes:

[0012] If the carrier tracking mode is automatic and it is detected that the currently configured carrier signal cannot be locked, then the signal strength of N preset target ports is detected; the signal strength of the N target ports reflects the strength of the base station pilot signal.

[0013] If it is detected that the signal strength of at least one of the N target ports is greater than a preset strength threshold, then the information of the next candidate carrier is obtained according to the carrier tracking mode.

[0014] In some embodiments, it also includes:

[0015] If the signal strength of all N target ports is detected to be less than the preset strength threshold, the signal strength of the N target ports will be queried again after the first delay time, and the process will be repeated until at least one target port is detected to have a signal strength greater than the preset strength threshold.

[0016] In some embodiments, prior to obtaining information about the next candidate carrier, the method includes setting the carrier tracking mode to a smart mode;

[0017] The step of obtaining the information of the next candidate carrier according to the carrier tracking mode includes: if the carrier tracking mode is intelligent mode, then collecting and identifying the carrier signals existing in the current space, and selecting a frequency point that meets the preset requirements as the next candidate carrier based on the quality of the carrier signal.

[0018] In some embodiments, the method further includes: if the carrier tracking mode is a smart mode and a candidate carrier that can be locked is found, then displaying information about the locked candidate carrier.

[0019] In some embodiments, the method includes periodically detecting whether the user terminal has locked the currently configured carrier signal.

[0020] The present invention also provides a multi-carrier carrier tracking device for a distributed antenna system, comprising:

[0021] The acquisition module is used to acquire the carrier tracking mode of the user terminal;

[0022] The reconfiguration module is used to obtain information about the next candidate carrier according to the carrier tracking mode when it is detected that the currently configured carrier signal cannot be locked, and to reconfigure the user terminal from the current carrier to the carrier corresponding to the information of the next candidate carrier.

[0023] The search module is used to repeat the above process if the user terminal cannot lock onto the signal of the configured candidate carrier until a candidate carrier that can be locked is found.

[0024] In some embodiments, it also includes:

[0025] The setting module is used to set the carrier tracking mode to automatic mode and preset the information of N carriers;

[0026] The reconfiguration module is further configured to select the next candidate carrier from the preset N carriers if the carrier tracking mode is automatic.

[0027] In some embodiments, including:

[0028] The port signal detection module is used to detect the signal strength of N preset target ports if the carrier tracking mode is automatic and the currently configured carrier signal cannot be locked; the signal strength of the N target ports reflects the strength of the base station pilot signal.

[0029] The reconfiguration module is further configured to obtain information about the next candidate carrier according to the carrier tracking mode if it is detected that the signal strength of at least one of the N target ports is greater than a preset strength threshold.

[0030] Compared with the prior art, the multi-carrier carrier tracking method and apparatus for a distributed antenna system provided by the present invention can bring at least the following beneficial effects: in the case of coverage scenarios with multiple operators, when some on-network operator base stations are abnormal, the user terminal can automatically track the base station signals of other normally operating on-network operators and automatically switch to them to achieve normal signal coverage, thus ensuring the user's experience. Attached Figure Description

[0031] The preferred embodiments will be described below in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of a multi-operator carrier tracking method and apparatus for a distributed antenna system.

[0032] Figure 1 This is a flowchart of an embodiment of the multi-carrier carrier tracking method for a distributed antenna system according to the present invention;

[0033] Figure 2 This is a flowchart of another embodiment of the multi-carrier carrier tracking method for a distributed antenna system of the present invention;

[0034] Figure 3 This is a flowchart of another embodiment of the multi-carrier carrier tracking method for a distributed antenna system of the present invention;

[0035] Figure 4 This is a flowchart of another embodiment of the multi-carrier carrier tracking method for a distributed antenna system of the present invention;

[0036] Figure 5 This is a schematic diagram of a structure of an embodiment of the multi-carrier carrier tracking device for a distributed antenna system of the present invention;

[0037] Figure 6 This is a schematic diagram of another embodiment of the multi-carrier carrier tracking device for a distributed antenna system of the present invention;

[0038] Figure 7 This is a schematic diagram of another embodiment of the multi-carrier carrier tracking device for a distributed antenna system of the present invention. Detailed Implementation

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0040] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0041] As mentioned earlier, distributed antenna systems typically support multiple operators, multiple standards, and multiple carriers. However, due to the complex network conditions of such systems, signal anomalies may occur at some network operator base stations. To avoid affecting the user experience, this invention provides a carrier tracking method for the terminal side. When a user terminal detects that it has failed to lock onto the currently configured carrier, it automatically tracks other available carriers and reconfigures the user terminal onto those carriers, thereby ensuring that coverage and user experience remain unchanged.

[0042] In one embodiment of the present invention, such as Figure 1 As shown, a multi-operator carrier tracking method for a distributed antenna system includes:

[0043] Step S100: Obtain the carrier tracking mode of the user terminal;

[0044] Step S200 detects whether the user terminal has locked the currently configured carrier signal;

[0045] Step S300: When it is detected that the currently configured carrier signal cannot be locked, the information of the next candidate carrier is obtained according to the carrier tracking mode, and the user terminal is reconfigured from the current carrier to the carrier corresponding to the information of the candidate carrier.

[0046] Step S400 determines whether the user terminal can lock onto the configured candidate carrier; if not, proceed to step S300; otherwise, carrier tracking ends.

[0047] Specifically, this method is applicable to scenarios with multiple carriers covering the terminal.

[0048] If a user terminal is synchronized with the base station pilot signal corresponding to a carrier, the user terminal can lock onto that carrier, also known as being synchronized with that carrier signal. If the user terminal loses synchronization with the base station pilot signal corresponding to that carrier, the user terminal cannot lock onto that carrier, also known as losing synchronization with that carrier signal. The process by which the user terminal finds a carrier that it can lock onto is called carrier tracking.

[0049] Configure the carrier tracking mode on the user terminal. Carrier tracking modes include manual mode, automatic mode, and intelligent mode.

[0050] Manual mode only requires setting the carrier information of one operator, which must be an operator that the user has already activated. The carrier information includes carrier frequency information, and in different standards, it may also include other information. For example, in 5G TDD systems, it also includes carrier time slot structure configuration information, such as time slot ratio parameters.

[0051] Manual mode is suitable for simple network signal environments, single-carrier environments, or environments where the user has only activated one carrier's permissions. In this mode, carrier tracking is relatively simple; it simply tracks and locks onto the set carrier. If a loss of lock is detected, the set carrier will automatically lock onto it again once the signal is restored.

[0052] Automatic mode requires pre-setting information for N carriers. These N carriers include different carriers from the same operator, different carriers from different operators, or a combination of both. N > 1, and N is designed according to requirements. These carriers are carriers from the operators the user has already activated.

[0053] In automatic mode, if the system loses synchronization with the carrier signal of the current operator, it will attempt to lock onto a preset set of N carriers sequentially according to preset rules. If the signal is not restored during the first round of iteration and the locking fails, the system will continue with the second and third rounds of iteration until the signal of one carrier is restored, meaning one carrier is successfully locked. For example, if there are four preset carriers A and D, and the current carrier is carrier B, the preset rules could be repeated polling of C, D, A, and B, or sequential polling of A and D, etc., as long as each carrier can be traversed. Automatic mode is suitable for situations where the current user has activated multiple operators.

[0054] In intelligent mode, the user operation is the simplest and the requirements for the user are the lowest. The system automatically identifies the carrier signals present in the current space and selects a carrier that meets the requirements as the next candidate carrier, such as a carrier belonging to the user's already activated operator, and the carrier signal strength meets the preset requirements.

[0055] For 5G TDD systems, in addition to identifying the carrier information currently existing in space, the system also needs to analyze the time slot structure configuration information such as the time slot allocation parameters of the spatial signals.

[0056] The intelligent mode is suitable for situations where the network conditions are complex and the user has already activated many carriers.

[0057] In intelligent mode, if the current operator's carrier signal loses synchronization, the system automatically searches for spatial signals to determine the next candidate carrier to unlock. If a lock is achieved, carrier tracking ends; if a lock is not achieved, the system searches for the next candidate carrier.

[0058] There are three modes: manual mode consumes the least system resources and has the fastest execution speed; intelligent mode has simple user settings but consumes the most system resources; automatic mode is in the middle, as it has pre-configured carrier information from the operator, which narrows the search range and allows for quick recovery when the terminal loses its lock.

[0059] Whether the configured carrier signal can be locked can be determined by detecting alarms related to the base station pilot signal out of sync or the same out-of-sync state of the base station pilot signal.

[0060] This embodiment provides multiple carrier tracking modes that can be selected according to the actual scenario. When a user has activated multiple operators, the automatic or intelligent mode can be used to automatically switch to a lockable carrier when the current carrier is lost, ensuring the continuity of coverage and improving the user experience.

[0061] In one embodiment, step S200 includes:

[0062] Step S210 periodically checks whether the user terminal has locked the currently configured carrier signal.

[0063] Specifically, the detection method is a polling mode, and the parameters that reflect the loss of synchronization are periodically detected. For example, if an alarm related to the loss of synchronization of the base station pilot signal is found, or if the same loss of synchronization state of the base station pilot signal is lost, it is determined that the user terminal cannot lock the currently configured carrier signal.

[0064] This detection method is suitable for scenarios where real-time requirements are not high, such as when the network briefly drops for a few seconds and then recovers without needing to switch carriers.

[0065] For scenarios requiring rapid locking after a step loss and high real-time performance, the detection period can be set to a smaller value.

[0066] In one embodiment, step S300 is transformed into: when it is detected that the user terminal cannot lock the currently configured carrier signal within a preset time, the information of the next candidate carrier is obtained according to the carrier tracking mode, and the user terminal is reconfigured from the current carrier to the carrier corresponding to the information of the next candidate carrier.

[0067] Step S400 is transformed as follows: If the user terminal cannot lock the signal of the configured candidate carrier within a preset time, the above process is repeated until a candidate carrier that can be locked is found.

[0068] This can increase the robustness of the system.

[0069] In another embodiment of the invention, such as Figure 2 As shown, a multi-operator carrier tracking method for a distributed antenna system includes:

[0070] Step S010 sets the carrier tracking mode of the user terminal to automatic mode and presets the information of N carriers;

[0071] Step S100: Obtain the carrier tracking mode of the user terminal;

[0072] Step S200 detects whether the user terminal has locked the currently configured carrier signal;

[0073] Step S310 When it is detected that the currently configured carrier signal cannot be locked, if the carrier tracking mode is automatic mode, a carrier is selected from the preset N carriers as the next candidate carrier, and the user terminal is reconfigured from the current carrier to the next candidate carrier.

[0074] Step S400 determines whether the user terminal can lock onto the configured candidate carrier; if not, proceed to step S310; otherwise, carrier tracking ends.

[0075] In one embodiment, step S200 includes:

[0076] Step S210 periodically checks whether the user terminal has locked the currently configured carrier signal.

[0077] This embodiment provides the basic flow of a carrier tracking method in automatic mode. Because candidate carriers are pre-set, this method can quickly resolve the loss of lock-up issues at user terminals.

[0078] In another embodiment of the invention, such as Figure 3 As shown, a multi-operator carrier tracking method for a distributed antenna system includes:

[0079] Step S010 sets the carrier tracking mode of the user terminal to automatic mode and presets the information of N carriers;

[0080] Step S100: Obtain the carrier tracking mode of the user terminal;

[0081] Step S200 detects whether the user terminal has locked the currently configured carrier signal;

[0082] Step S320: When it is detected that the currently configured carrier signal cannot be locked, if the carrier tracking mode is automatic, the signal strength of N preset target ports is detected. The signal strength of the N preset target ports reflects the strength of the base station pilot signal. If the signal strength of all N target ports is detected to be less than the preset strength threshold, the signal strength of the N target ports is queried again after a first delay time. This process is repeated until at least one target port is detected to have a signal strength greater than the preset strength threshold. ；

[0083] Step S330: When it is detected that the currently configured carrier signal cannot be locked, and at least one of the preset N target ports has a signal strength greater than the preset strength threshold, the information of the next candidate carrier is obtained according to the carrier tracking mode, and the user terminal is reconfigured from the current carrier to the next candidate carrier.

[0084] Step S400 determines whether the user terminal can lock onto the configured candidate carrier; if not, proceed to step S320; otherwise, carrier tracking ends.

[0085] Specifically, the target port is the antenna port used for power detection. The signal strength of the target port reflects the strength of the base station pilot signal. Taking a 4T4R system as an example, the system has four antenna ports, and all four antenna ports can be set as target ports, i.e., N=4. When the current carrier signal is detected to be out of lock, step S320 is entered. First, according to the four target ports configured by the user, the power of the four target ports is read and compared with the threshold value. If the power of all four target ports is less than the threshold value, it means that the signals of all candidate operators are very weak or have no signal, and they cannot be synchronized. At this time, there is no need to reconfigure the carrier to save equipment and system resources. The query can continue after the first delay time (configurable). If it is found that the power of a target port is greater than the threshold value, it means that there is a signal, and then the corresponding carrier is reconfigured.

[0086] In one embodiment, step S200 includes:

[0087] Step S210 periodically checks whether the user terminal has locked the currently configured carrier signal.

[0088] This embodiment provides another carrier tracking method in automatic mode. It checks the strength of the carrier signal by detecting the signal strength at the target port, and only performs carrier reconfiguration when at least one strong carrier signal is detected. This saves equipment and system resources. This method is particularly suitable for environments with poor network signal, base station damage, or frequent disconnections, and does not affect equipment performance.

[0089] In another embodiment of the invention, such as Figure 4 As shown, a multi-operator carrier tracking method for a distributed antenna system includes:

[0090] Step S020 sets the carrier tracking mode to intelligent mode;

[0091] Step S100: Obtain the carrier tracking mode of the user terminal;

[0092] Step S200 detects whether the user terminal has locked the currently configured carrier signal;

[0093] Step S340 When it is detected that the currently configured carrier signal cannot be locked, if the carrier tracking mode is intelligent mode, the carrier signals existing in the current space are collected and identified. Based on the quality of the carrier signal, a frequency point that meets the preset requirements is selected as the next candidate carrier, and the user terminal is reconfigured from the current carrier to the next candidate carrier.

[0094] Step S400 determines whether the user terminal can lock the configured candidate carrier; if not, proceed to step S340; otherwise, execute step S500.

[0095] Step S500 displays information about the locked candidate carriers.

[0096] Specifically, in intelligent mode, user operation is simple. The system automatically identifies existing carrier signals in space and selects suitable frequency points as candidate carriers based on their signal quality. Of course, the candidate carriers must be carriers from the user's already activated operator. Carrier signal quality is evaluated based on factors such as signal strength and signal stability.

[0097] Existing technologies can be used to identify carrier signals in space, such as frequency scanning. From the carriers of the user's already activated operators, carriers with signal strength greater than a first threshold and signal stability greater than a second threshold can be selected as candidate carriers. Alternatively, the carrier with the strongest signal strength among those with signal stability greater than the second threshold can be selected as a candidate carrier. Multiple scans can be performed to statistically analyze changes in signal amplitude; if the variance of the signal amplitude is small, it indicates good signal stability.

[0098] In one embodiment of the present invention, such as Figure 5 As shown, a multi-carrier carrier tracking device for a distributed antenna system includes:

[0099] The acquisition module 100 is used to acquire the carrier tracking mode of the user terminal;

[0100] The detection module 200 is used to detect whether the user terminal has locked the currently configured carrier signal;

[0101] The reconfiguration module 300 is used to obtain the information of the next candidate carrier according to the carrier tracking mode when it is detected that the current carrier signal cannot be locked, and to reconfigure the user terminal from the current carrier to the carrier corresponding to the information of the candidate carrier.

[0102] The search module 400 is used to obtain the information of the next candidate carrier if the user terminal cannot lock the signal of the configured candidate carrier, and reconfigure the user terminal from the current carrier to the carrier corresponding to the information of the candidate carrier, repeating the above process until a candidate carrier that can be locked is found.

[0103] In one embodiment, the detection module 200 is also used to periodically detect whether the user terminal has locked the currently configured carrier signal.

[0104] In another embodiment of the invention, such as Figure 6 As shown, a multi-carrier carrier tracking device for a distributed antenna system includes:

[0105] The setting module 500 is used to set the carrier tracking mode of the user terminal to automatic mode and preset the information of N carriers.

[0106] The acquisition module 100 is used to acquire the carrier tracking mode of the user terminal;

[0107] The detection module 200 is used to detect whether the user terminal has locked the currently configured carrier signal;

[0108] The reconfiguration module 300 is used to select the next candidate carrier from a preset N carriers when it is detected that the carrier signal cannot be locked and the carrier tracking mode is automatic, and reconfigure the user terminal from the current carrier to the next candidate carrier.

[0109] The search module 400 is used to obtain the information of the next candidate carrier if the user terminal cannot lock the signal of the configured candidate carrier, and reconfigure the user terminal from the current carrier to the carrier corresponding to the information of the candidate carrier, repeating the above process until a candidate carrier that can be locked is found.

[0110] The display module 600 is used to display information about the locked candidate carrier if the user terminal locks the signal of the configured candidate carrier.

[0111] In one embodiment, the detection module 200 is also used to periodically detect whether the user terminal has locked the currently configured carrier signal.

[0112] In another embodiment of the invention, such as Figure 7 As shown, a multi-carrier carrier tracking device for a distributed antenna system includes:

[0113] The setting module 500 is used to set the carrier tracking mode of the user terminal to automatic mode and preset the information of N carriers.

[0114] The acquisition module 100 is used to acquire the carrier tracking mode of the user terminal;

[0115] The detection module 200 is used to detect whether the user terminal has locked the currently configured carrier signal;

[0116] The port signal detection module 700 is used to detect the signal strength of N preset target ports if the carrier tracking mode is in automatic mode and the currently configured carrier signal cannot be locked; the signal strength of the N target ports reflects the strength of the base station pilot signal; if the signal strength of all N target ports is less than the preset strength threshold, the signal strength of the N target ports is queried again after a first delay time, and the process is repeated until at least one target port is detected to have a signal strength greater than the preset strength threshold.

[0117] The reconfiguration module 300 is used to obtain the information of the next candidate carrier according to the carrier tracking mode if the signal strength of at least one of the N target ports is detected to be greater than the preset strength threshold, and reconfigure the user terminal from the current carrier to the next candidate carrier.

[0118] The search module 400 is used to obtain the information of the next candidate carrier if the user terminal cannot lock the signal of the configured candidate carrier, and reconfigure the user terminal from the current carrier to the carrier corresponding to the information of the candidate carrier, repeating the above process until a candidate carrier that can be locked is found.

[0119] The display module 600 is used to display information about the locked candidate carrier if the user terminal locks the signal of the configured candidate carrier.

[0120] In one embodiment, the detection module 200 is also used to periodically detect whether the user terminal has locked the currently configured carrier signal.

[0121] In another embodiment of the invention, such as Figure 6 As shown, a multi-carrier carrier tracking device for a distributed antenna system includes:

[0122] Setting module 500 is used to set the carrier tracking mode to intelligent mode;

[0123] The acquisition module 100 is used to acquire the carrier tracking mode of the user terminal;

[0124] The detection module 200 is used to detect whether the user terminal has locked the currently configured carrier signal;

[0125] The reconfiguration module 300 is used to collect and identify the carrier signals existing in the current space when it is detected that the carrier signal cannot be locked. If the carrier tracking mode is intelligent mode, it selects the frequency point that meets the preset requirements as the next candidate carrier based on the quality of the carrier signal and reconfigures the user terminal from the current carrier to the next candidate carrier.

[0126] The search module 400 is used to obtain the information of the next candidate carrier if the user terminal cannot lock the signal of the configured candidate carrier, and reconfigure the user terminal from the current carrier to the carrier corresponding to the information of the candidate carrier, repeating the above process until a candidate carrier that can be locked is found.

[0127] The display module 600 is used to display information about the locked candidate carrier if the user terminal locks the signal of the configured candidate carrier.

[0128] In one embodiment, the detection module 200 is also used to periodically detect whether the user terminal has locked the currently configured carrier signal.

[0129] It should be noted that the embodiments of the multi-carrier carrier tracking device for a distributed antenna system provided by this invention and the aforementioned embodiments of the multi-carrier carrier tracking method for a distributed antenna system are both based on the same inventive concept and can achieve the same technical effects. Therefore, other specific details of the embodiments of the multi-carrier carrier tracking device for a distributed antenna system can be found in the description of the aforementioned embodiments of the connection establishment method.

[0130] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-carrier operator tracking method of a distributed antenna system that supports multiple operators simultaneously, the method comprising: When the distributed antenna system experiences signal anomalies at some network operator base stations, the method performs the following steps: Obtain the carrier tracking mode of the user terminal; the carrier tracking mode includes automatic mode; When it is detected that the carrier signal currently configured cannot be locked, if the carrier tracking mode is in automatic mode, the signal strength of N preset target ports is detected; the signal strength of the N target ports reflects the strength of the base station pilot signal. If the signal strength of all N target ports is detected to be less than the preset strength threshold, the signal strength of the N target ports will be queried again after the first delay time, and the process will be repeated until at least one target port is detected to have a signal strength greater than the preset strength threshold. If it is detected that the signal strength of at least one of the N target ports is greater than a preset strength threshold, then the information of the next candidate carrier is obtained according to the carrier tracking mode, and the user terminal is reconfigured from the current carrier to the carrier corresponding to the information of the next candidate carrier. If the carrier tracking mode is automatic, then the next candidate carrier is selected from a preset N carriers, and the N carriers belong to different operators. If the user terminal cannot lock onto the signal of the configured candidate carrier, the above process is repeated until a candidate carrier that can be locked is found.

2. The multi-operator carrier tracking method for a distributed antenna system according to claim 1, characterized in that, The carrier tracking mode also includes an intelligent mode; The step of obtaining the information of the next candidate carrier according to the carrier tracking mode includes: if the carrier tracking mode is intelligent mode, then collecting and identifying the carrier signals existing in the current space, and selecting a frequency point that meets the preset requirements as the next candidate carrier based on the quality of the carrier signal.

3. The multi-carrier operator tracking method of a distributed antenna system according to claim 2, wherein, Also includes: If the carrier tracking mode is intelligent mode and a candidate carrier that can be locked is found, the information of the locked candidate carrier is displayed.

4. The multi-carrier operator tracking method of a distributed antenna system according to claim 1, wherein, Also includes: Periodically check whether the user terminal has locked the currently configured carrier signal.

5. A multi-carrier operator tracking apparatus of a distributed antenna system that supports multiple operators simultaneously, the apparatus comprising: When the distributed antenna system experiences signal anomalies at some network operator base stations, the device includes: The acquisition module is used to acquire the carrier tracking mode of the user terminal; the carrier tracking mode includes an automatic mode. The port signal detection module is used to detect the signal strength of N preset target ports when it is detected that the carrier signal cannot be locked and the carrier tracking mode is in automatic mode. The signal strength of the N target ports reflects the strength of the base station pilot signal. If the signal strength of the N target ports is detected to be less than the preset strength threshold, the signal strength of the N target ports is queried again after a first delay time. This process is repeated until at least one target port is detected to have a signal strength greater than the preset strength threshold. The reconfiguration module is configured to: if it is detected that the signal strength of at least one of the N target ports is greater than a preset strength threshold, acquire information of a next candidate carrier according to the carrier tracking mode, and reconfigure the user terminal from a current carrier to a carrier corresponding to the information of the next candidate carrier; if the carrier tracking mode is an automatic mode, the next candidate carrier is selected from N preset carriers, and the N carriers belong to different operators respectively. The search module is configured to: if the user terminal cannot lock the signal of the configured candidate carrier, repeat the above process until a lockable candidate carrier is found.

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