Room-divided antenna system and method and device and medium for locating fault link thereof

Abstract

This application belongs to the field of wireless communication and discloses an indoor distributed antenna system and its fault link location method, device, and medium. The method includes: establishing a one-to-one mapping relationship between antennas and RFID tags, and generating a link information table containing complete link information from each antenna to the RFID gateway; in response to an abnormal RFID tag reading status event, dividing the link information table into a fault link set and a normal link set; sequentially disassembling each link along its connection path into several minimum link units; removing minimum link units from the fault link set that match the minimum link units in the normal link set, and retaining the remaining minimum link units as fault link units, and merging the fault link units along their original connection paths to obtain the minimum fault link. This solution has low deployment cost, is easy to operate, and provides accurate fault location.

Description

Technical Field

[0001] This application belongs to the field of wireless communication, and specifically relates to an indoor distributed antenna system and its fault link location method, device and medium. Background Technology

[0002] An antenna feeder system is a radio wave transceiver system composed of an antenna and a feeder line. It realizes bidirectional conversion between electrical signals and electromagnetic waves and is an indispensable core device for wireless communication. The antenna feeder system mainly consists of antennas, feeders, jumpers, tower-top amplifiers, and surge protectors. Its core functions include: signal transmission and reception (transmitting the radio frequency signals transmitted by the base station to the antenna for transmission through the feeder line, while simultaneously receiving uplink signals from mobile terminals and transmitting them back to the base station); signal amplification (the tower-top amplifier amplifies the uplink signals to improve transmission quality); and surge protection (surge protectors and grounding devices protect the system from damage caused by lightning strikes).

[0003] With the rapid development of mobile communication networks, indoor distributed antenna systems (hereinafter referred to as indoor distributed systems) have become a primary means of solving indoor signal coverage problems, and their construction scale continues to expand. Because the components in the passive indoor distributed antenna feeder links (such as couplers, power dividers, and antennas) are all passive devices that do not require power, they cannot autonomously report alarms when faults occur, resulting in a long-standing lack of effective automated monitoring methods. Currently, when signal coverage quality deteriorates in indoor distributed systems, the main approach relies on user complaints, followed by maintenance personnel carrying instruments to the site for segment-by-segment troubleshooting. This method is inefficient in fault location and incurs high labor costs.

[0004] Chinese invention patent CN107241757B discloses a method and system for monitoring indoor distributed antenna systems based on radio frequency identification (RFID). This method involves setting RFID tags on various devices (including couplers, power dividers, and antennas) within the system; assigning corresponding coding information to each device; and using an N-bit hexadecimal coding rule to write the device type and topological location information into the tag. Monitoring signals are sent to the tags, and response signals are received. The operating status of each tag is determined based on the response signals, thereby determining the operating status of each device. However, the above technical solution has the following obvious defects and shortcomings in practical engineering applications: The high cost and poor RFID signal penetration lead to low system reliability: This solution requires attaching RFID tags to every coupler, power divider, and antenna, resulting in a large tag requirement and high deployment costs. Furthermore, passive components typically have metal cavity shells, which strongly shield and attenuate the radio frequency signals emitted by the RFID gateway. RFID signals cannot effectively penetrate the outer wall of the device cavity to activate the internal tags, making it difficult for the gateway to receive the tag's feedback signal. Simultaneously, due to multipath reflection and signal attenuation within the metal cavity, even if a tag is barely activated, its echo signal strength is extremely unstable, easily leading to system misjudgments or missed judgments, making reliable operation difficult in practical engineering.

[0005] The coding rules are complex, resulting in poor engineering operability: This solution uses an N-bit hexadecimal coding system, where different digits represent information such as device type and topological location, and the coded information with certain patterns is directly written into the RFID tag. This complex coding method requires the RFID tag manufacturer to cooperate in writing the code during the production process, increasing the complexity of supply chain management and customization costs. Secondly, the coding rules are difficult for on-site construction personnel to understand and master, and coding errors are prone to occur when tags are pasted, replaced, or the system is expanded, leading to system identification confusion. The complex coding method is not convenient for tag replacement and link adjustment during later operation and maintenance, resulting in poor overall engineering operability.

[0006] The fault location granularity is too coarse: This solution can only determine if there is a fault in the entire link from the gateway to a specific tag. However, in the actual topology of an indoor distributed antenna system (DAS) network, a long link may contain multiple power dividers, couplers, and feeders tens or even hundreds of meters long, involving numerous nodes. When a fault occurs at a point in the link, all downstream tags on that link cannot be read normally, and the system can only report a general fault for the entire link. After receiving the alarm, maintenance personnel still need to carry instruments and check each step of the long link, testing each device and feeder segment one by one, in order to determine the specific fault point. This coarse-grained fault location method fails to fully utilize the advantages of RFID monitoring, and the improvement in fault diagnosis efficiency is limited.

[0007] In summary, there is an urgent need in the existing technology for a low-cost, easy-to-operate, and accurate fault location solution for indoor distributed antenna systems. Summary of the Invention

[0008] To address the aforementioned issues, this application provides a method for locating faulty links in an indoor distributed antenna feeder system, the indoor distributed antenna feeder system, equipment, and media. By breaking down the complete link into its smallest link units and employing an elimination method, the fault can be accurately located to the smallest link unit. This solution offers low deployment costs, ease of operation, and precise fault location.

[0009] The technical solution is as follows: A method for locating fault links in an indoor distributed antenna system includes: Establish a one-to-one mapping relationship between antennas and RFID tags, and generate a link information table based on the physical topology of the antenna feeder system. The link information table contains complete link information from each antenna to the RFID gateway. In response to an abnormal RFID tag reading status event, the link information table is divided into a faulty link set and a normal link set, wherein the faulty link set is the set of links where the faulty antenna of the RFID tag reading status is abnormal; Each complete link in the faulty link set and the normal link set is sequentially broken down into several minimum link units along its connection path. The minimum link unit is a link segment consisting of two adjacent nodes and their connecting lines. Remove all minimum link units in the faulty link set that match the minimum link unit in the normal link set. The minimum link units in the faulty link set that are not removed are taken as faulty link units. The faulty link units are then merged according to their original connection paths to obtain the faulty link.

[0010] Furthermore, the nodes in a complete link include an RFID gateway, a combiner, a coupler, a power divider, and an antenna.

[0011] Furthermore, the RFID gateway transmits radio frequency carrier signals to each antenna along the feeder. After the RFID tags located at each antenna are activated by the radio frequency carrier, they return a response signal carrying the tag ID to the RFID gateway through backscatter modulation.

[0012] Furthermore, the abnormal RFID tag reading status includes: the RFID gateway failing to receive a response signal from the corresponding RFID tag within a specified time, or the strength of the received response signal being lower than a preset threshold.

[0013] Furthermore, when each complete link in the faulty link set and the normal link set is sequentially decomposed into several minimum link units along its connection path, the decomposition granularity corresponds to the number of nodes on the link. If a link contains n nodes, it is decomposed into n-1 minimum link units.

[0014] Furthermore, the normal link set is the set of links containing all antennas except the faulty antenna in the link information table; The removal of all minimum link units in the faulty link set that match the minimum link unit in the normal link set includes: Each minimum link unit in the faulty link set is compared with all minimum link units in the normal link set. If there is a minimum link unit whose node identifier and the connection relationship between the nodes are completely matched, then the minimum link unit is removed from the faulty link set.

[0015] Furthermore, when merging the faulty link units along the original connection path, if multiple faulty link units corresponding to the same faulty antenna are continuous on the path, they are merged into a continuous faulty link; otherwise, they are output as multiple independent faulty links.

[0016] An indoor distributed antenna system includes: An RFID gateway is used to transmit radio frequency signals to RFID tags installed at each antenna of the antenna feeder system and to receive response signals from the RFID tags. The data storage module is used to store the link information table, which is generated based on the physical topology of the indoor distributed antenna system and contains complete link information from each antenna to the RFID gateway and a one-to-one mapping relationship between antennas and RFID tags. The status determination module is used to divide the link information table into a fault link set and a normal link set in response to an abnormal RFID tag reading status event. The fault link set is the set of links where the faulty antenna of the RFID tag reading status is abnormal. The link disassembly module is used to disassemble each complete link in the faulty link set and the normal link set into several minimum link units along its connection path. The minimum link unit is a link segment composed of two adjacent nodes and their connecting lines. The fault location module is used to remove all minimum link units in the fault link set that match the minimum link unit in the normal link set. The minimum link units in the fault link set that are not removed are taken as fault link units, and the fault link units are merged according to the original connection path to obtain the fault link.

[0017] Based on the same inventive concept, this application also provides an electronic device, including: a memory and a processor; the processor is used to read and execute a computer program stored in the memory to implement the aforementioned fault link location method for an indoor distributed antenna system.

[0018] Based on the same inventive concept, this application also provides a computer storage medium storing computer-executable instructions, which, when executed, implement the aforementioned fault link location method for an indoor distributed antenna system.

[0019] Compared with the prior art, this application has the following advantages: This solution only requires setting an RFID tag on each antenna as an identification mark, which simplifies the operation process and reduces deployment costs. By breaking down the complete link into the smallest link unit, and taking advantage of the logic that the link unit shared with the normal link must be fault-free, the solution uses an elimination method to find the smallest link unit that is exclusively used by the faulty antenna, and finally finds the shortest faulty link to achieve accurate positioning.

[0020] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A flowchart of the fault link location method for the indoor distributed antenna system in this application embodiment is shown; Figure 2 A schematic diagram of the physical topology of the indoor distributed antenna system in this embodiment is shown. Figure 3 A schematic diagram of the fault link of the indoor distributed antenna feeder system in this embodiment is shown. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The fault link location method for indoor distributed antenna feeder systems described in this application is applicable to indoor or outdoor distributed antenna feeder networks consisting of feeders, passive devices and antennas, and is particularly suitable for fault monitoring and precise location of passive antenna feeder systems based on RFID (Radio Frequency Identification) technology.

[0025] like Figure 1 As shown, the fault link location method of the indoor distributed antenna system in this application embodiment includes: S1. Establish a one-to-one mapping relationship between antennas and RFID tags, and generate a link information table based on the physical topology of the antenna feeder system. The link information table contains complete link information from each antenna to the RFID gateway. Based on the engineering design drawings or site survey records of the indoor distributed antenna system, determine the total number of antennas and the number of each antenna (e.g., A1, A2, A3…An). Bind pre-prepared passive UHF RFID tags (e.g., TID or EPC codes) to each antenna individually. It should be noted that in this embodiment, the RFID tags are only affixed to the antennas at the end of the system; tags do not need to be affixed to other nodes in the link, and no topology-related coding information is required in the RFID tags. The RFID tag serves only as a unique identifier for the antenna. The correspondence between antenna numbers and tag IDs is maintained independently by a mapping table on the system side.

[0026] The physical topology of an indoor distributed antenna system refers to the actual physical connection relationships between various devices and components.

[0027] The link information table refers to a set of records stored in structured data format, containing complete connection path information from each antenna to the RFID gateway. Specifically, the link information table records the sequence of all nodes traversed by each antenna from the RFID gateway to its destination. When the system undergoes expansion or modification resulting in changes to the topology, the link information table can be updated.

[0028] S2. In response to an abnormal RFID tag reading status event, the link information table is divided into a faulty link set and a normal link set, wherein the faulty link set is the set of links where the faulty antennas of the RFID tag reading status are abnormal. The link information table is divided into two complementary sets: a faulty link set and a normal link set. The faulty link set consists of the links containing faulty antennas with abnormal RFID tag reading status during this anomaly event. The normal link set consists of all other links in the link information table except for the links containing the faulty antennas. All antennas in the normal link set are antennas with normal RFID tag reading status.

[0029] S3. Each complete link in the faulty link set and the normal link set is sequentially broken down into several minimum link units along its connection path. The minimum link unit is a link segment composed of two adjacent nodes and their connecting lines. The term "node" refers to a connection point or branch point with an independent physical form in an indoor distributed antenna system, including but not limited to devices or components such as RFID gateways, combiners, couplers, power dividers, and antennas. The term "minimum link unit" refers to a basic link segment consisting of two adjacent nodes and the connecting line (feeder) between the nodes. For example, "node A - feeder - node B" together constitute a link segment, which is the smallest independent unit in the link that cannot be further divided.

[0030] It is important to understand that the minimum link unit described in this embodiment is the smallest unit of granularity for fault location. Any physical fault in the system (feeder open circuit, loose connector, damaged device, etc.) will ultimately manifest as a degradation in the transmission performance of one or more minimum link units.

[0031] S4. Remove all minimum link units in the faulty link set that match the minimum link unit in the normal link set. The minimum link units in the faulty link set that are not removed are taken as faulty link units. The faulty link units are then merged according to their original connection paths to obtain faulty links.

[0032] After the link set is disassembled, the smallest link unit in the normal link set is used as a reference benchmark. All smallest link units that match the reference benchmark are removed from the faulty link set. The remaining smallest link units are the faulty link units.

[0033] In this embodiment, only an RFID tag needs to be set at each antenna as the antenna's identification. There is no need to store any topology-related coding information, which simplifies the operation process, reduces deployment costs, and solves the problem of RFID signal penetration. By breaking down the complete link into the smallest link unit, and using the logic that the link unit shared with the normal link must be fault-free, the smallest link unit exclusively shared by the faulty antenna is obtained through the elimination method. Finally, the shortest faulty link is obtained, and accurate positioning is achieved.

[0034] In this embodiment, the mapping relationship between the antenna and the RFID tag can be established in, but is not limited to, the following two methods: Method 1: Set up a tag mapping table to record the one-to-one correspondence between antenna numbers and RFID tag IDs. For example, antenna A1 corresponds to RFID tag T1001, antenna A2 corresponds to RFID tag T1002, and so on. This tag mapping table is pre-stored in the network management platform or edge computing gateway for use in subsequent steps.

[0035] Method 2: At the antenna installation site, the construction personnel affix RFID tags to the inside of the antenna housing or the feeder connector, scan the tags with a handheld terminal and enter their corresponding antenna numbers. After completing the binding operation, the binding data is uploaded to the network management platform.

[0036] In this embodiment, the RFID gateway combines the RFID monitoring signals to the main feeder via a combiner, sharing the same feeder network for transmission with the communication signals. Therefore, each complete link entry in the link information table starts at the RFID gateway and ends at the antenna.

[0037] The RFID gateway transmits radio frequency carrier signals to each antenna along the feeder. After the passive RFID tags set at each antenna are activated by the radio frequency carrier, they return a response signal carrying the tag ID to the RFID gateway through backscatter modulation.

[0038] The results of the RFID gateway reading the RFID tag include the following two scenarios: RFID tag read successful: The RFID gateway successfully received the response signal from the RFID tag within the specified time, and the signal strength was not lower than the preset threshold. This indicates that the antenna corresponding to the RFID tag and the signal transmission path of its link are in normal working condition.

[0039] RFID tag reading status abnormal: The RFID gateway failed to receive a response signal from the corresponding RFID tag within the specified time, or the strength of the received response signal was lower than a preset threshold. This situation indicates that there is an abnormality in the antenna corresponding to the RFID tag or the signal transmission path of the link it is connected to.

[0040] The preset threshold is pre-calibrated based on parameters such as the link loss budget of the indoor distributed antenna system, the RFID gateway transmission power, and the tag sensitivity, and can be dynamically adjusted according to the actual deployment environment.

[0041] It's important to understand that the RFID gateway reads RFID tags periodically. In each reading cycle, the gateway sequentially sends query commands to each antenna tag and receives response signals. When the gateway detects that the reading status of a tag changes from normal to abnormal, an RFID tag reading status abnormality event is generated. This event includes the antenna identifier corresponding to the abnormal tag (e.g., antenna number A3) and the abnormality type (no response received / response signal strength below a threshold). When an RFID tag reading status abnormality event occurs, a fault link location process is initiated; if all tag reading statuses are normal, no location action is performed, only normal periodic monitoring is maintained. This event-driven response mechanism avoids meaningless computational resource consumption when there are no faults.

[0042] by Figure 2 Taking the physical topology of the indoor distributed antenna system as an example, all devices or equipment on the indoor distributed links are numbered: R represents the RFID gateway, B represents the combiner, C represents the coupler, D represents the power divider, and A represents the antenna. Based on this physical topology, a link information table (Table 1) is generated. The complete link "R1-B1-C1-D1-C9-A1" where antenna A1 is located contains a total of 6 nodes: RFID gateway R1, combiner B1, coupler C1, power divider D1, coupler C9, and antenna A1.

[0043] Table 1

[0044] For a faulty antenna with an abnormal RFID tag reading status, query the complete link where the antenna is located in the link information table (Table 1) and add the link record to the faulty link set. If the abnormal event involves multiple faulty antennas, add the complete link records corresponding to all faulty antennas to the faulty link set, and add the links where other normal antennas are located to the normal link set.

[0045] Suppose that during a certain detection cycle, the RFID tag reading status of antennas A3, A10, and A11 is found to be abnormal. The link information table (Table 1) is divided into a faulty link set (Table 2) and a normal link set (Table 3).

[0046] Table 2

[0047] Table 3

[0048] Based on the definition of the minimum link unit, when each complete link in the faulty link set and the normal link set is sequentially decomposed into several minimum link units along its connection path, the decomposition granularity corresponds to the number of nodes on the link. For any complete link, the decomposition rule is as follows: if a link contains n nodes, then the link is decomposed into n-1 minimum link units. Each minimum link unit contains a pair of adjacent nodes on the link and their connecting line. All minimum link units are connected end-to-end according to the signal transmission direction to form a complete link path.

[0049] For example, the complete link “R1-B1-C1-D1-C10-A3” where antenna A3 is located can be broken down into 5 minimum link units: R1-B1, B1-C1, C1-D1, D1-C10, C10-A3.

[0050] Following the above method, each complete link in Tables 2 and 3 is broken down into the smallest link units to obtain the set of faulty smallest link units (Table 2') and the set of normal smallest link units (Table 3').

[0051] Table 2'

[0052] Table 3'

[0053] As can be seen from Tables 2' and 3', each smallest link unit is a slice of the corresponding long link. After all the slices are spliced ​​together in sequence, they are exactly restored to the complete original link.

[0054] Further, removing all minimum link units in the faulty link set that match the minimum link unit in the normal link set includes: comparing each minimum link unit in the faulty link set with all minimum link units in the normal link set; if there is a minimum link unit whose node identifier and connection relationship between nodes are completely matched, then the minimum link unit is removed from the faulty link set.

[0055] In a complete signal transmission path, the closer the link is to the RFID gateway, the more antennas share it. If a link segment (the smallest link unit) appears in both the path of a faulty antenna and a normal antenna, then that link segment must be normal; otherwise, the RFID tag of the normal antenna would also be unreadable. Therefore, by comparing the link where the faulty antenna is located with the link where the normal antenna is located unit by unit, the fault can be precisely located to the end link segment exclusively used by the faulty antenna.

[0056] For example, the following operations are performed on the set of minimum faulty link units (Table 2') and the set of minimum normal link units (Table 3'): For the link where the faulty antenna A3 is located: the minimum link unit "R1-B1" is also found to exist in Table 3', and the two match, so the "R1-B1" unit is removed from Table 2'; similarly, the "B1-C1" unit and the "C1-D1" unit are removed; the "D1-C10" unit matches the minimum link unit of the link where the normal antenna A4 is located, and is removed; while the "C10-A3" unit cannot be found in Table 3', so it is retained.

[0057] Similarly, for the link where the faulty antenna A10 is located: the "R1-B1" unit, "B1-C1" unit, "C1-C2" unit, "C2-C3" unit, "C3-C4" unit, and "C4-C13" unit are all retrieved and removed in Table 3', while the "C13-D2" unit and "D2-A10" unit cannot be retrieved in Table 3' and are retained.

[0058] For the link where the faulty antenna A11 is located: "C13-D2" unit and "D2-A11" unit are reserved.

[0059] After the above comparison and elimination process, the remaining faulty link units are: "C10-A3", "C13-D2", "D2-A10", "C13-D2", "D2-A11" This updates the set of minimum faulty link units (Table 2') to the table of faulty link units (Table 2'').

[0060] Table 2''

[0061] Further, the faulty link units are merged along their original connection paths to obtain a faulty link. Preferably, when merging the faulty link units along their original connection paths, if multiple faulty link units corresponding to the same faulty antenna are continuous on the path, they are merged into a continuous faulty link; otherwise, they are output as multiple independent faulty links.

[0062] In this embodiment, the faulty link units corresponding to each faulty antenna in Table 2'' are merged: Antenna A3: Only has "C10-A3" unit, and the faulty link after merging is "C10-A3"; Antenna A10: The "C13-D2" unit is continuous with the "D2-A10" unit, and the faulty link after merging is "C13-D2-A10"; Antenna A11: The "C13-D2" unit is continuous with the "D2-A11" unit, and the faulty link after merging is "C13-D2-A11".

[0063] Figure 3 For this embodiment in Figure 2 The diagram shows the fault links obtained after application in the indoor distributed antenna feeder system. The dashed lines represent the three independent fault links located, namely C10-A3, C13-D2-A10, and C13-D2-A11.

[0064] Taking the faulty link "C13-D2-A10" as an example, maintenance personnel can clearly know that the fault is located on the branch path from coupler C13, through power divider D2, to antenna A10. The specific hardware to be checked includes: The feed line and its connector between coupler C13 and power divider D2; The power divider D2 itself; The feed line and connector between power divider D2 and antenna A10; The antenna A10 itself.

[0065] The above investigation scope is limited to the three nodes and the two feeder segments between them. It is not necessary to check all the shared parts (R1 to C13) in the original link where antenna A10 is located before C13, which greatly reduces the workload of on-site investigation.

[0066] This application also provides an indoor distributed antenna system, including: an RFID gateway, a data storage module, a status determination module, a link disassembly module, and a fault location module.

[0067] The RFID gateway is used to transmit radio frequency signals to the RFID tags installed at each antenna of the antenna feeder system and to receive the response signals returned by the RFID tags.

[0068] The data storage module is used to store the link information table, which is generated based on the physical topology of the indoor distributed antenna system and contains complete link information from each antenna to the RFID gateway, as well as a one-to-one mapping relationship between antennas and RFID tags.

[0069] The status determination module is used to respond to RFID tag reading status abnormal events by dividing the link information table into a fault link set and a normal link set. The fault link set is the set of links where the faulty antennas of the RFID tags with abnormal reading status are located.

[0070] The link disassembly module is used to disassemble each complete link in the faulty link set and the normal link set into several minimum link units along their connection paths. The minimum link unit is a link segment consisting of two adjacent nodes and their connecting lines.

[0071] The fault location module is used to remove all minimum link units in the fault link set that match the minimum link unit in the normal link set. The minimum link units that are not removed in the fault link set are taken as fault link units, and the fault link units are merged according to the original connection path to obtain the fault link.

[0072] Regarding the system in the above embodiments, the specific manner in which each unit module performs operations has been described in detail in the embodiments related to the method, and will not be elaborated here.

[0073] Based on the same inventive concept, this application also provides an electronic device, including: a memory and a processor, wherein the processor is used to read and execute a computer program stored in the memory to implement the aforementioned fault link location method for an indoor distributed antenna system.

[0074] Based on the same inventive concept, this application also provides a computer storage medium storing computer-executable instructions, which, when executed, implement the aforementioned fault link location method for indoor distributed antenna feeder system.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0076] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to this application, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0077] In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. Finally, it should be noted that the above descriptions are merely preferred embodiments of this application and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of this application.

Claims

1. A method for locating fault links in an indoor distributed antenna system, characterized in that, The method includes: Establish a one-to-one mapping relationship between antennas and RFID tags, and generate a link information table based on the physical topology of the antenna feeder system. The link information table contains complete link information from each antenna to the RFID gateway. In response to an abnormal RFID tag reading status event, the link information table is divided into a faulty link set and a normal link set, wherein the faulty link set is the set of links where the faulty antenna of the RFID tag reading status is abnormal; Each complete link in the faulty link set and the normal link set is sequentially broken down into several minimum link units along its connection path. The minimum link unit is a link segment consisting of two adjacent nodes and their connecting lines. Remove all minimum link units in the faulty link set that match the minimum link unit in the normal link set. The minimum link units in the faulty link set that are not removed are taken as faulty link units. The faulty link units are then merged according to their original connection paths to obtain the faulty link.

2. The method according to claim 1, characterized in that, The nodes in a complete link include an RFID gateway, a combiner, a coupler, a power divider, and an antenna.

3. The method according to claim 1 or 2, characterized in that, The RFID gateway transmits radio frequency carrier signals to each antenna along the feeder. After the RFID tags located at each antenna are activated by the radio frequency carrier, they return a response signal carrying the tag ID to the RFID gateway through backscatter modulation.

4. The method according to claim 3, characterized in that, The abnormal RFID tag reading status includes: the RFID gateway failing to receive a response signal from the corresponding RFID tag within a specified time, or the strength of the received response signal being lower than a preset threshold.

5. The method according to claim 1, characterized in that, When each complete link in the faulty link set and the normal link set is sequentially decomposed into several minimum link units along its connection path, the decomposition granularity corresponds to the number of nodes on the link. If a link contains n nodes, it is decomposed into n-1 minimum link units.

6. The method according to claim 1, characterized in that, The normal link set is the set of links containing all antennas except the faulty antenna in the link information table; The removal of all minimum link units in the faulty link set that match the minimum link unit in the normal link set includes: Each minimum link unit in the faulty link set is compared with all minimum link units in the normal link set. If there is a minimum link unit whose node identifier and the connection relationship between the nodes are completely matched, then the minimum link unit is removed from the faulty link set.

7. The method according to claim 1, characterized in that, When merging the faulty link units along the original connection path, if multiple faulty link units corresponding to the same faulty antenna are continuous on the path, they are merged into a continuous faulty link; otherwise, they are output as multiple independent faulty links.

8. An indoor distributed antenna system, characterized in that, The system includes: An RFID gateway is used to transmit radio frequency signals to RFID tags located at each antenna and to receive response signals returned by the RFID tags. The data storage module is used to store the link information table, which is generated based on the physical topology of the indoor distributed antenna system and contains complete link information from each antenna to the RFID gateway and a one-to-one mapping relationship between antennas and RFID tags. The status determination module is used to divide the link information table into a fault link set and a normal link set in response to an abnormal RFID tag reading status event. The fault link set is the set of links where the faulty antenna of the RFID tag reading status is abnormal. The link disassembly module is used to disassemble each complete link in the faulty link set and the normal link set into several minimum link units along its connection path. The minimum link unit is a link segment composed of two adjacent nodes and their connecting lines. The fault location module is used to remove all minimum link units in the fault link set that match the minimum link unit in the normal link set. The minimum link units in the fault link set that are not removed are taken as fault link units, and the fault link units are merged according to the original connection path to obtain the fault link.

9. An electronic device, characterized in that, include: Memory, processor; The processor is configured to read and execute the computer program stored in the memory to implement the fault link location method for the indoor distributed antenna system according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed, implement the fault link location method for the indoor distributed antenna system according to any one of claims 1-7.

Images