CN113473513B - Link fault detection and processing method, device, system and storage medium - Google Patents

Link fault detection and processing method, device, system and storage medium Download PDF

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CN113473513B
CN113473513B CN202111024360.1A CN202111024360A CN113473513B CN 113473513 B CN113473513 B CN 113473513B CN 202111024360 A CN202111024360 A CN 202111024360A CN 113473513 B CN113473513 B CN 113473513B
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link
failure
unit
report
recovery operation
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CN113473513A (en
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唐懿夫
魏波
丁琦
刘松涛
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Chengdu Airui Wireless Technology Co ltd
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Chengdu Airui Wireless Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity

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Abstract

The invention discloses a link fault detection and processing method, a system, a device and a storage medium for a distributed base station system, wherein the method comprises the following steps: detecting whether the communication link is failed based on one or more of the direct message indication, the indirect message indication and the occurrence of a specific event, and generating a link failure report when the failure occurs; determining whether to perform a link recovery operation based on the link failure report; and controlling the device involved in the failed communication link to perform a predetermined action to remove the failure when it is determined that the link recovery operation needs to be performed. The invention ensures communication by positioning the link with the link failure in the distributed base station system and repairing the link with the link failure.

Description

Link fault detection and processing method, device, system and storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a system, an apparatus, and a storage medium for detecting and processing a link failure in a distributed base station system.
Background
For indoor coverage of wireless communications, distributed base stations are one of the most dominant deployment modalities today. The distributed base station has lower cost and high construction flexibility. The core of the initial distributed base station structure is to separate a conventional macro base station Baseband processing Unit (BBU) from a Radio frequency processing Unit (RRU), and connect the two units through an optical fiber. In network deployment, the BBU, the core network and the radio network control equipment are centralized in a machine room, and then are connected with the RRU deployed on a planning station through optical fibers to complete network coverage. Thereby reducing the construction cost and improving the efficiency. With the demands for increasing the communication range and reducing the construction cost, the modules for forwarding and converging the uplink and downlink data between the user and the base station are separated to form an Extended Unit (EU).
There are many options for the functionality split of a distributed base station based on the third generation partnership project (3 GPP) protocols. The most widely accepted distributed base station consists of three parts: the first part is a host unit (BBU or DU) which completes the modulation and demodulation of baseband signals, the second part is an Expansion Unit (EU) which forwards and merges uplink and downlink data, and the third part is a remote unit (pRRU) which receives and transmits uplink and downlink radio frequency signals.
Fig. 1 shows a schematic diagram of a protocol stack 100 of a physical layer (PHY layer), a medium access control layer (MAC layer) and a radio resource control layer (RRC layer) in an access network of a distributed base station.
First, Radio Resource management, Control, and scheduling are performed by a Radio Resource Control (RRC) protocol. Specifically, the following functions are mainly included: broadcasting of system information; paging information (paging); establishing and releasing RRC (radio Resource control) connection; transmitting NAS (Non-Access Stratum) information including session management, user management, security management, and charging management; transmitting AS (Access stratum) information including radio bearer management, radio channel processing and encryption; transmission of user radio access capability; configuring wireless resources; measurement configuration and reporting; and movement control.
Then, an ip (internet Protocol) header of an upper layer is compressed and decompressed through a Packet Data Convergence Protocol (PDCP), and user Data is transmitted and maintained. Meanwhile, encryption and decryption of user data and a control plane protocol are supported, so that the integrity of data is guaranteed.
Subsequently, the segmentation and retransmission services are provided to the user through a Radio Link Control (RLC).
Next, the Media Access Control (MAC) protocol defines the way data frames are propagated, physical addressing and logical topology on the medium. For data transmission, the MAC protocol first determines whether data can be transmitted, and if so, the data and control information are transmitted to the physical layer in a prescribed format. For data reception, the MAC protocol first determines whether there is a transmission error in the input information, and if there is no error, removes the control information and sends it to the upper link control.
Then, a data path is provided for the data side device through a Physical layer Protocol (PHY) to transmit data.
Finally, data is transmitted and received via a radio frequency link (RF chain).
Three units in the distributed base station: the functional division of the BBU (or DU), EU and pRRU, as a general understanding, is generally believed that the BBU (or DU) will implement the processing functions of the RRC, PDCP, High RLC (High-RLC), Low RLC (Low-RLC), High MAC (High-MAC), Low MAC (Low-MAC) and High PHY (High-PHY) protocol modules, the EU will implement the processing functions of the Low PHY (Low-PHY) protocol modules, and the pRRU will implement the processing functions of the RF modules. But this division of functional blocks is not exclusive. For example, EU may perform High-PHY and MAC layer protocol processing.
With the development and evolution of the 5G technology, more application scenarios are introduced, and meanwhile, the requirements for various wireless performances are also increased correspondingly, such as higher throughput, shorter time delay, users supporting simultaneous communication, and guarantee of continuity of user services. For the distributed base station system, the following problems are to be solved:
1. guarantee of quality of an end-to-end link (E2E link) between a base station and a user;
2. when the link quality is degraded, determining the functional unit with the problem;
3. and when the link quality is degraded, the behavior of each functional unit in the distributed base station system is ensured to recover the link quality.
In the conventional cellular communication technology, a terminal may detect a Link failure (Link failure), for example, the terminal detects that the downlink Reference Signal Power (Reference Signal Receiving Power) is lower than a predetermined threshold. In this scenario, the terminal may recover Link recovery (Link recovery) through an initial access process. In the distributed base station, since the base station is composed of the pRRU, EU, and BBU (or DU), the link is restored by newly performing the initial access reception, and the location of the failed unit cannot be specified, and the link restoration cannot be performed more efficiently. For example, if only the middle EU fails, the terminal does not need to do a process of initial access.
Disclosure of Invention
In view of the above drawbacks of the prior art, the present invention provides a method, a system, a device, and a storage medium for detecting and processing a link failure in a distributed base station system, which are used for locating a link in the distributed base station system that has a link failure and repairing the link that has a link failure to ensure communication.
In order to achieve the above object, an embodiment of the present invention provides a method for detecting and processing a link failure in a distributed base station system, where the method includes: detecting whether the communication link is failed based on one or more of the direct message indication, the indirect message indication and the occurrence of a specific event, and generating a link failure report when the failure occurs; determining whether to perform a link recovery operation based on the link failure report; and controlling the device involved in the failed communication link to perform a predetermined action to remove the failure when it is determined that the link recovery operation needs to be performed.
The embodiment of the invention also provides a link fault detection and processing system for a distributed base station system, which comprises: fault detection means for detecting whether a communication link is faulty based on one or more of the direct message indication, the indirect message indication and the occurrence of a specific event, and generating a link fault report when a fault occurs; and a failure processing means for judging whether or not to perform a link recovery operation based on the link failure report, and controlling the device relating to the communication link in which the failure has occurred to perform a predetermined action to eliminate the failure when it is judged that the link recovery operation needs to be performed.
The embodiment of the invention also provides a link fault detection method for the distributed base station system, which comprises the following steps: detecting whether a communication link is down based on one or more of a direct message indication, an indirect message indication, and an occurrence of a particular event associated with one or more devices in the distributed base station system; and generating a link failure report when a failure is detected, and generating a link state report when no failure is detected; wherein the link failure report indicates that a communication link between a first device and a second device immediately downstream thereof in the distributed base station system has failed; the link state report indicates a likelihood of failure of a communication link between a first device and a second device immediately downstream thereof in the distributed base station system.
The embodiment of the invention also provides a fault detection device for the distributed base station system, which comprises a fault detection module, a fault detection module and a fault detection module, wherein the fault detection module comprises a fault detection module; an obtaining module, configured to obtain one or more of a direct message indication, an indirect message indication, and an occurrence of a specific event related to one or more devices in the distributed base station system; a determining module for determining whether a communication link is failed based on one or more of the obtained direct message indication, indirect message indication, and occurrence of a specific event; and a generating module for generating a link failure report when it is determined that a failure has occurred and a link status report when it is determined that no failure has occurred, wherein the link failure report indicates that a communication link between a first device and a second device immediately downstream thereof in the distributed base station system has failed; and the link state report indicates a likelihood of failure of a communication link between a first device and a second device immediately downstream thereof in the distributed base station system.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for detecting and processing a link failure for a distributed base station system according to any of the above embodiments is implemented.
An embodiment of the present invention further provides another computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the link failure detection method for a distributed base station system according to any of the above embodiments.
The invention has the advantages that the link fault detection and processing method, the system, the device and the storage medium for the distributed base station system locate the fault link in the distributed system through the received fault report indication directly indicating the fault link or indirectly through communication parameters such as received signal energy, bit error rate, feedback information and the like. And then performs link failure recovery by, for example, adjusting communication parameters or switching links, thereby ensuring communication.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 shows a schematic diagram of a protocol stack of a distributed base station.
Fig. 2A, fig. 2B, and fig. 2C respectively show a networking topology diagram of the distributed base station system of the present invention.
Fig. 3 is a block diagram illustrating a link failure detection and processing system for a distributed base station system according to an embodiment of the present invention.
Fig. 4 shows a block diagram of a link failure detection apparatus for a distributed base station system according to an embodiment of the present invention.
Fig. 5 shows a schematic diagram of link reconnection provided by an embodiment of the invention.
Fig. 6 shows a schematic diagram of link switching provided by an embodiment of the present invention.
Fig. 7 is a flowchart illustrating a method for detecting and processing a link failure in a distributed base station system according to an embodiment of the present invention.
Fig. 8 is another flowchart illustrating a method for detecting and processing a link failure in a distributed base station system according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware circuits or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail with reference to the accompanying drawings and detailed description, in order to make the objects, features and advantages thereof more comprehensible.
Fig. 2A, fig. 2B, and fig. 2C respectively show a networking topology schematic diagram of the distributed base station system of the present invention. Specifically, the distributed base station system includes at least one host unit (DU) configured to perform at least processing of data in communication and modulation and demodulation of baseband signals, only one host unit being shown in the figure as an example; at least one Extension Unit (EU) connected to the host unit and configured to perform at least forwarding and merging of uplink and downlink data; at least one Remote Unit (RU) coupled to the expansion unit and configured to perform at least reception and transmission of uplink and downlink radio frequency signals; and at least one communication terminal (not shown) configured to communicate directly with the remote unit.
As shown in fig. 2A, fig. 2B, and fig. 2C, the distributed base station system in this embodiment may employ at least a star connection, a chain connection, and a hybrid connection. Specifically, as shown in fig. 2A, in the star connection, all the Extension Units (EU) are connected to the host unit (DU), and there is no connection between the Extension Units (EU); as shown in fig. 2B, in the chain connection, the host unit DU is connected to a parent extension unit (EU 1), and the parent extension unit (EU 1) is connected to the child extension units (EU 1 and EU 2); as shown in fig. 2C, in a hybrid connection (i.e., a combination of star connection and chain connection), the host unit (DU) is connected to two parent extension units (EU 1 and EU 2), respectively, and the parent extension unit (EU 2) is connected to the child extension unit (EU 3).
Fig. 3 shows a block diagram of a link failure detection and processing system 200 for a distributed base station system according to an embodiment of the present invention. The system 200 includes: a failure detection means 10 for detecting whether a communication link has failed based on one or more of the direct message indication, the indirect message indication, and the occurrence of a specific event, and generating a link failure report when the failure occurs; and a failure processing means 20 for judging whether or not to perform a link recovery operation based on the link failure report, and controlling the device relating to the failed communication link to perform a predetermined action to eliminate the failure when it is judged that the link recovery operation needs to be performed.
Wherein the fault handling apparatus 20 comprises: a receiver 21 for receiving a failure report of the link from the failure detection apparatus 10; a determiner 22, configured to determine whether to perform a link recovery operation according to the received link failure report; and a controller 23 configured to control the device involved in the failed communication link to perform a predetermined action to resolve the failure when performing a link recovery operation, wherein the step of controlling the device involved in the failed communication link to perform the predetermined action to resolve the failure further comprises performing at least one of the following operations: performing a link reconnection between a first device involved in the failed communication link and one of second devices downstream thereof; or the first device involved in the failed communication link and the second device downstream thereof or a third device downstream of the second device perform link switching. The controller 23 is further configured to provide a list of candidate devices for switching the first device to the second device when the second device performs link switching; and providing a list of candidate devices for switching the second device to the third device when the third device performs link switching.
As for the candidate device list for switching the first device, all or part of the first devices except the first device connected upstream to the second device may be used as the candidate device list for switching the first device. Or all or part of other first devices which are not connected with the first device upstream of the second device and send the same or similar fault reports may be used as the candidate device list for switching the first device.
As for the candidate device list for switching the second device, all or part of the second devices other than the second device connected upstream from the third device may be used as the candidate device list for switching the second device. Or all or part of other second devices which are not connected with the second device upstream and send the same or similar fault reports can be used as a candidate device list for switching the second device.
Wherein the failure detection apparatus 10 is further configured to detect that the communication link is not currently failed based on one or more of the direct message indication, the indirect message indication, and the occurrence of the specific event, and generate a link status report. The receiver 21 is further configured to receive the link status report from the failure detection apparatus; the judger 22 is further configured to judge whether to execute a link pre-recovery operation according to the received road status report; and the controller 23 is further configured to control the device involved in the communication link that is pre-failed to perform a predetermined action to avoid the failure from occurring when performing the link pre-recovery operation; wherein controlling the device involved in the pre-failed communication link to perform the predetermined action comprises performing at least one of: performing a link reconnect by one of the first device and the second device of the communication link in which the failure occurred; or the second device or a third device downstream of the second device performs link switching.
The fault handling apparatus 20 further comprises a regulator 24, wherein: when there is a link state report greater than the first preset number of times indicating that the current communication link state satisfies the preset trigger condition of the link pre-restoration operation, the determiner 22 determines to perform the link pre-restoration operation. When there is a link state report smaller than the first preset number of times and larger than the second preset number of times indicating that the current communication link state satisfies the preset trigger condition of the link pre-recovery operation, the adjustor 24 adjusts at least one of the judgment condition whether the communication link is failed and the trigger condition whether the link pre-recovery operation needs to be performed.
Fig. 4 shows a block diagram of a link failure detection apparatus 10 for a distributed base station system according to an embodiment of the present invention. The failure detection device 10 includes: an obtaining module 11, configured to obtain one or more of a direct message indication, an indirect message indication, and an occurrence of a specific event related to one or more devices in the distributed base station system; a determining module 12, configured to determine whether a communication link fails based on one or more of the obtained direct message indication, indirect message indication, and occurrence of a specific event; and a generating module 13, configured to generate a link failure report when it is determined that a failure occurs and a link status report when it is determined that no failure occurs, where the link failure report indicates that a communication link between a first device and a second device immediately downstream thereof in the distributed base station system has failed; and the link state report indicates a likelihood of failure of a communication link between a first device and a second device immediately downstream thereof in the distributed base station system.
In this embodiment, the failure detection apparatus 10 and the failure processing apparatus 20 may be located in the same or different units of a distributed base station system, for example, the failure detection apparatus 10 and the failure processing apparatus 20 may be located in a terminal at the same time, and the failure detection apparatus 10 and the failure processing apparatus 20 may also be located in a terminal and a remote unit, respectively.
Specifically, the failure detection apparatus 10 determines whether a link failure exists in a currently maintained link according to at least one of the received control information, data information, or other information. The links include, but are not limited to, links including a terminal and a remote unit, a remote unit and an expansion unit, an expansion unit and an expansion unit, and an expansion unit and a host unit. The Control information received by the failure detection apparatus 10 may be Downlink Control information, for example, from a Physical Downlink Control Channel (PDCCH) or a Synchronization Signal (SSS). The received Control information may also be Uplink Control information, for example, from a Physical Uplink Control Channel (PUCCH). The received information may also be Control information of an edge connection (Sidelink), for example, from a Sidelink Control Channel (PSCCH). The received data information may be Downlink data information, for example, from a Downlink data Channel (PDSCH). The received data information may also be Uplink data information, for example, from a Physical Uplink Shared Channel (PUSCH). The received data information may also be Sidelink data information, for example, from a Sidelink data Channel (psch). The other information received may also be other information, such as feedback information (HARQ), from a downlink control channel, or from an uplink control channel or an uplink data channel, or from a sidelink control channel or a feedback channel. The other information may also be information from a higher layer, such as the RRC layer or the MAC layer. The failure detection apparatus 10 can determine whether there is a link failure by using the received Explicit information (Explicit information), for example, the control information includes a direct indication of the failure occurrence. The link failure detection unit may also determine whether a link failure exists by using the received non-explicit information (Implicit information), for example, by determining whether a link failure exists according to the power of the received reference signal.
The failure processing device 20 is used for deciding the operation required for link recovery according to the information provided by the failure detection device 10. Wherein the receiver 21 receives a failure report of the link from the failure detection apparatus 10 and provides it to a decider 22. The decider 22 decides whether to perform a link restoration operation for the failure report of the link according to a preset rule. If a link recovery operation is performed, the controller 23 sends an instruction to perform a predetermined action to remove the failure to a unit that needs to execute the instruction. The failure handling apparatus 20 may also send a report of the success or failure of the link recovery to the unit that needs to receive the report.
Wherein the predetermined action comprises at least performing a link reconnection or a link handover. Specifically, the link reconnection refers to reconnection after communication parameters are adjusted for devices included in a failed link. The communication parameters at least comprise communication parameters such as wave beam management parameters, sending power, time frequency resources of wireless communication and the like. For example, as shown in fig. 5, for a unit 400 and a unit 401 in which a link failure occurs, the communication parameters described above may be adjusted to repair the link. However, only the communication parameters of unit 400 may be adjusted, only the communication parameters of unit 401 may be adjusted, or the communication parameters of unit 400 and unit 401 may be adjusted at the same time. The link switching refers to instructing a certain unit in the distributed base station system to perform unit switching, for example, instructing a certain unit to reselect a target unit connected to the certain unit. As shown in fig. 6, a link switching can be performed by the unit 500 and the unit 501 in which a link failure occurs. The unit 500 in this example switches the object connected to itself to the unit 502.
In this embodiment, the failure processing device 20 is further configured to determine whether to perform a previous repair or handover operation on the link according to the information provided by the failure detection device 10. Specifically, the receiver 21 of the failure processing apparatus 20 receives a link failure report or a link status report from the failure detection apparatus 10 and supplies the link failure report or the link status report to the determiner 22. The decider 22 decides whether to perform a link restoration operation or a link pre-restoration operation for the link failure report according to a preset rule. If the link is not failing, the decider 22 evaluates the likelihood of the link failing to anticipate the occurrence of a link failure. If the decider 22 evaluates that the possibility of the failure is higher than the first predetermined value, the decider 22 will decide to perform the link pre-recovery operation, and the controller 23 will perform the corresponding link pre-recovery operation. If decider 22 evaluates that the possibility of occurrence of a failure is higher than the second predetermined value but lower than the first predetermined value, decider 22 may also decide not to perform the link pre-recovery operation but to change the subsequent determination criteria, for example, the adjustor 24 adjusts a threshold parameter for judging whether a failure occurs, adjusts an evaluation predetermined value for the possibility of occurrence of a failure, and the like. If the evaluated probability of failure is lower than the second predetermined value, the decider 22 will decide not to perform the link pre-recovery operation.
The link failure detection and processing method for the distributed base station system and the specific functions of the devices and modules in the link failure detection and processing system will be described in detail below with reference to fig. 7 and 8.
Fig. 7 is a flowchart illustrating a method for detecting and processing a link failure in a distributed base station system according to an embodiment of the present invention. The method comprises the following steps:
step S10: detecting whether the communication link is failed based on one or more of the direct message indication, the indirect message indication and the occurrence of a specific event, and generating a link failure report when the failure occurs;
step S20: determining whether to perform a link recovery operation based on the link failure report;
step S30: when it is determined that a link recovery operation needs to be performed, the device involved in the communication link in which the failure has occurred is controlled to perform a predetermined action to eliminate the failure.
Specifically, in conjunction with fig. 3, 4 and 7, in step S10, the failure detection apparatus 10 may detect whether a link failure occurs, and may locate a functional unit in which the link failure occurs. Further, the link failure report in step S10 indicates that the communication link between the first device and the second device immediately downstream thereof in the distributed base station system has failed.
Specifically, when the failure detection device 10 receives information explicitly indicating that the current link has failed, it may determine that a link failure has occurred and generate a failure report. Alternatively, if the failure detection apparatus 10 receives information indirectly indicating that a link fails, it may determine whether a link failure occurs through a preset rule and generate a failure report, where the preset rule may determine whether a measured target parameter reaches a threshold according to a configured parameter table to determine whether a link failure occurs. Still alternatively, if the failure detection apparatus 10 detects a specific event, for example, detects that information explicitly indicating that the current link has failed or information indirectly indicating that the link has failed is missing or times out, it may determine that a link failure has occurred and generate a failure report. It should be understood that the failure detection apparatus 10 may also detect whether the communication link has failed based on one or more of a direct message indication, an indirect message indication, and the occurrence of a particular event.
For example, taking the signal strength of the reference signal as an example, thresholds of the received signal strengths of the units (such as the host unit, the extension unit, and the remote unit) at different levels in the distributed base station system may be configured. When the reference signal energy (e.g., Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), etc.) of one unit directly providing link failure information to another unit decreases below a preset threshold, it may be determined that a link failure has occurred and a failure report may be generated. The reference signal may be a demodulation reference signal (DMRS), a channel state information reference signal (CSI-RS), a Phase Tracking Reference Signal (PTRS), a Synchronization Signal (SS), or the like. The threshold may be configured by SIB, RRC, PBCH, PDCCH, or PDSCH, or may be a pre-configuration (pre-configuration) parameter.
In this embodiment, the information indirectly indicating that the link fails may also be that the bit error rate exceeds a threshold; or the number of times that the feedback state of the hybrid automatic repeat request information (HARQ information) is NACK (i.e. scheduling failure) exceeds a threshold.
In this embodiment, when the information indicating that the current link fails or the information indirectly indicating that the link fails is missing or is overtime, it may be determined that the current link fails at least through the following steps: if a certain unit in the link does not receive an indication of normal detachment of another unit, for example, the terminal is normally far away and switched to another cell through a handover (handover) mechanism, and if a certain unit of the link needs to periodically send a link failure report or indirect indication information (periodic reporting) to another unit, but the periodic failure report or indirect indication information is not reported at a specified time; or if a certain unit in the link does not receive an indication of normal detachment of another unit, e.g. the terminal is normally away and handed over to another cell by a handover mechanism, and if a certain unit of the link needs a demand-based feedback to another unit, but fails to make a feedback.
The failure detection apparatus 10 may locate a functional unit in which a link failure occurs in the process of determining that a link failure occurs in the current link. Specifically, according to the position of the fault detection apparatus 10, that is, the fault detection apparatus 10 may be located in different units of the distributed base station system, the locating the functional unit where the link fault occurs may include the following exemplary cases:
case one, when the fault detection device 10 is located inside the host unit:
a) when the host unit detects a link failure, for example, the signal strength of the reference signal received by the host unit from the expansion unit is below a certain threshold qDU_ULAnd then the link fault can be judged.
b) The host unit sends a measurement request to the extension unit and, via the extension unit, to the remote unit. For example, if the host unit determines a link failure according to the signal strength of the reference signal RSRP, the host unit requests the extension unit and the remote unit to measure and report the signal strength of the reference signal RSRP. Specifically, the extension unit will report the signal strength (measurement report R) of the RSRP received from the remote unitEU_UL) The remote unit reports the signal strength (measurement report R) of the RSRP received from the terminalRU_UL）。
c) Through the reported measurement result, the link with the link failure can be positioned:
if measurement report REU_ULAnd RRU_ULNo exception occurs (e.g. the signal strength of RSRP received from the remote unit reported by the extension unit is not below a predetermined threshold qEU_ULAnd the signal strength of the RSRP reported by the remote unit and received from the terminal is not lower than a given threshold qRU_UL) It can be determined that the link between the host unit and the expansion unit is faulty.
If measurement report REU_ULAn abnormality occurs, and RRU_ULNo exception occurs (e.g. the signal strength of RSRP received from the remote unit reported by the extension unit is below a predetermined threshold qEU_ULAnd the signal strength of the RSRP reported by the remote unit and received from the terminal is not lower than a given threshold qRU_UL) Then it can be determined that the link between the expansion unit and the remote unit is down.
If measurement report REU_ULAnd RRU_ULAll are abnormal (e.g. the RSRP received from the remote unit reported by the extension unit has a signal strength below a predetermined threshold qEU_ULAnd the signal strength of the RSRP reported by the remote unit and received from the terminal is lower than oneA predetermined threshold value qRU_UL) It may be determined that at least the link between the remote unit and the terminal is faulty.
Case two, when the fault detection device 10 is located inside the extension unit:
a) when the expansion unit detects a link failure with the host unit, e.g. the signal strength of a reference signal received by the expansion unit from the host unit is below a certain threshold qEU_DLAnd the link between the host unit and the expansion unit can be judged to be in fault.
b) When the extension unit detects a link failure with the remote unit, e.g. the signal strength of a reference signal received by the extension unit from the remote unit is below a certain threshold qEU_ULThe extension unit sends a measurement request to the remote unit. For example, if the extension unit determines a link failure according to the signal strength of the reference signal RSRP, the extension unit requests the remote unit to measure and report the signal strength of the reference signal RSRP. Specifically, the remote unit will report the signal strength (measurement report R) of RSRP received from the terminalRU_UL）。
c) Through the reported measurement result, the link with the link failure can be positioned:
if measurement report RRU_ULNo exception occurs (e.g. the signal strength of RSRP received from the terminal reported by the remote unit is not lower than a predetermined threshold qRU_UL) Then it can be determined that the link between the expansion unit and the remote unit is down.
If measurement report RRU_ULAn exception occurs (for example, the signal strength of the RSRP received from the terminal reported by the remote unit is lower than a predetermined threshold qRU_UL) It may be determined that at least the link between the remote unit and the terminal is faulty.
Case three, when the fault detection device 10 is located inside the remote unit:
a) when the remote unit detects a link failure with the terminal, e.g. the signal strength of a reference signal received by the remote unit from the terminal is below a certain threshold qRU_ULCan judge between the remote unit and the terminalFails.
b) When the remote unit detects a link failure with the extension unit, for example, the signal strength of the reference signal received by the remote unit from the extension unit is below a predetermined threshold qRU_DLThe remote unit sends a measurement request to the extension unit. For example, if the remote unit determines a link failure according to the signal strength of the reference signal RSRP, the remote unit requests the extension unit to measure and report the signal strength of the reference signal RSRP. Specifically, the extension unit will report the signal strength (measurement report R) of the RSRP received from the host unitEU_DL）。
c) Through the reported measurement result, the link with the link failure can be positioned:
if measurement report REU_DLNo exception occurs (e.g. the signal strength of RSRP received from the host unit reported by the extension unit is not below a predetermined threshold qEU_DL) Then it can be determined that the link between the expansion unit and the remote unit is down.
If measurement report REU_DLAn exception occurs (for example, the signal strength of RSRP reported by the extension unit and received from the host unit is lower than a predetermined threshold qEU_DL) It can be determined that at least the link between the host unit and the expansion unit has failed.
Case four, when the fault detection device 10 is located inside the terminal:
a) when the terminal detects a link failure, for example, the signal strength of the reference signal received by the terminal from the remote unit is below a certain threshold qUE_DLAnd then the fault can be judged.
b) The terminal sends a measurement request to the remote unit and, via the remote unit, to the extension unit. For example, if the terminal determines a link failure according to the signal strength of the reference signal RSRP, the terminal requests the remote unit and the extension unit to measure and report the signal strength of the reference signal RSRP. Specifically, the remote unit will report the signal strength (measurement report R) of RSRP received from the extension unitRU_DL) The extension unit will report the signal strength (measurement) of the RSRP received from the host unitVolume report REU_DL）。
c) Through the reported measurement result, the link with the link failure can be positioned:
if measurement report RRU_DLAnd REU_DLNo exception occurs (e.g. the signal strength of RSRP received from the extension unit reported by the remote unit is not below a predetermined threshold qRU_DLAnd the signal strength of the RSRP reported by the extension unit and received from the host unit is not lower than a predetermined threshold qEU_DL) Then it can be determined that the link between the remote unit and the terminal is faulty.
If measurement report REU_DLAn abnormality occurs, and RRU_DLNo exception occurs (e.g. the signal strength of RSRP received from the extension unit reported by the remote unit is below a predetermined threshold qEU_DLThe signal strength of the RSRP reported by the extension unit and received from the host unit is not lower than a predetermined threshold qRU_DL) Then it can be determined that the link between the expansion unit and the remote unit is down.
If measurement report REU_DLAnd RRU_DLAll are abnormal (e.g. the signal strength of RSRP received from the extension unit reported by the remote unit is lower than a predetermined threshold q)EU_DLAnd the signal strength of RSRP reported by the extension unit and received from the host unit is lower than a predetermined threshold qRU_DL) Then it may be determined that at least the link between the host unit and the extension has failed.
Thus, it can be seen from the above that the failure detection apparatus 10 can detect whether a communication link fails based on one or more of the direct message indication, indirect message indication and occurrence of a specific event from its upstream and/or downstream device, and the failure detection apparatus 10 can further trigger its upstream and/or downstream device to actively measure and report the indirect message indication.
In step S20, the determiner 22 of the failure processing apparatus 20 determines whether to perform a link recovery operation according to a preset rule. Specifically, in this embodiment, whether the link recovery needs to be performed may be determined according to the number m of times the failure report is received, or according to whether a certain target parameter exceeds or is lower than n% of a predetermined threshold. The times m and n% can be issued by the base station system through the downlink signaling of RRC or PHY, or can be preconfigured in advance by the base station system.
In step S30, when the link recovery operation needs to be performed, the failure processing device 20 may determine the operation that needs to be performed for link recovery and control the device related to the failed communication link to perform a predetermined action to resolve the failure. For example, the failure detection device 10 may detect a beam failure (beam failure), and the failure processing device 20 may determine a process of performing beam recovery (beam failure recovery). If the failure detection device 10 detects that the received power of the reference signal is smaller than a predetermined threshold, the failure processing device 20 may determine the progress of power up-regulation.
Specifically, for the recovery of the link failure, the controller 23 of the failure processing apparatus 20 is configured to perform at least one of the following operations: the method is used for controlling the first device with the link failure to perform link reconnection with one of the second devices or controlling the second device or a third device downstream of the second device to perform link switching. In this embodiment, the failure processing apparatus 20 may select an operation of performing link reconnection or link switching by a preset rule, or an operation of performing link switching when link reconnection fails. The operations performed by the fault recovery may be selected, for example, by considering the following: judging that a certain target parameter of the link fault reaches a certain threshold (for example, RSRP is smaller than a certain threshold q); the number of link failures exceeds N; or k consecutive occurrences of link failure, etc. The parameters such as N and k are configured to a node (e.g., a host unit, an extension unit, a remote unit, or a terminal) where the link repair unit is located by a network of the distributed base station system.
Further, when the link reconnection is selected to be performed, the controller 23 of the failure processing apparatus 20 instructs the first device to perform link reconnection after communication parameter adjustment is performed on at least one of the first device and the second device. Wherein the communication parameters at least comprise parameters of beam management, transmission power and time-frequency resources of wireless communication.
Further, when the link switching is selected to be performed, when the second device performs the link switching, the controller 23 of the failure processing apparatus 20 provides the second device with a list of candidate devices for switching the first device; and when the third device performs link switching, providing the third device with a list of candidate devices for switching the second device. Otherwise, the second device and the third device may select to switch the devices connected thereto according to actual conditions. For example, if a link failure is detected in a link between a first device (extension unit) and a second device (remote unit) downstream of the first device, a third device (terminal) downstream of the second device may be instructed to switch the remote unit, and at this time, the controller 23 of the failure processing apparatus 20 may provide a candidate list of remote units to the terminal, and the terminal may select one remote unit from the candidate remote units as a switching object. Otherwise, the terminal may select the remote unit with the strongest signal as the handover target according to the signal strength of RSRP, for example. It is understood that the list of whether to configure the handover object is configured by the distributed base station system.
The candidate list for a remote unit may be all or part of a remote unit other than the remote unit serving the terminal. Alternatively, all or some of the other remote units may not transmit the same or similar fault reports.
Specifically, for example, when the terminal and the fault report of the remote unit show that RSRP is smaller than the predetermined threshold, and L remote units in the remaining K remote units do not report a fault report that RSRP is smaller than the threshold, the L remote units may be used as candidate devices.
For example, when the failure reports of the terminal and the remote units show that RSRP is smaller than a predetermined threshold, L remote units in the remaining K remote units do not report a failure report that RSRP is smaller than the threshold, but RSRP results measured by M remote units in the L remote units approach the threshold, the remaining L-M remote units may be used as candidate devices, that is, the partial remote units are used as candidate devices.
For example, when the RSRP of the fault report between the terminal and the remote unit is smaller than the predetermined threshold, L remote units of the remaining K remote units report that the error rate exceeds the predetermined threshold. Since the relation between the RSRP of the actually received signal and the threshold value of the determined RSRP can be indirectly determined from the bit error rate, it can be considered that the similar report shows that the L remote units that transmit the bit error rate report are not suitable as candidate devices, and the remaining K-L remote units can be used as candidate devices.
Fig. 8 is another flowchart illustrating a method for detecting and processing a link failure in a distributed base station system according to an embodiment of the present invention. The method comprises the following steps:
step S101: detecting whether a communication link is failed based on one or more of the direct message indication, the indirect message indication and the occurrence of a specific event, and generating a link failure report when the occurrence of the failure is detected, and generating a link status report when the non-occurrence of the failure is detected;
step S201: if the link fails, judging whether to execute link recovery operation based on the link failure report;
step S301: when judging that the link recovery operation needs to be executed, controlling equipment related to the communication link with the fault to implement a preset action so as to eliminate the fault;
step S202, if the link does not have a fault, judging whether to execute link pre-recovery operation based on the link state report;
step S302: when judging that the link pre-recovery operation is executed, controlling equipment related to a communication link which is pre-failed to implement a preset action so as to avoid the failure;
step S303: when judging not to execute the link pre-recovery operation, adjusting at least one of a judgment condition whether the communication link is failed and a trigger condition whether the link pre-recovery operation needs to be executed.
Specifically, steps S201 and S301 can refer to steps S20 to S30 in the foregoing embodiment, and are not described herein again.
Specifically, in step S101, when the failure detection device 10 receives information explicitly indicating that the current link has failed, it may determine that a link failure has occurred and generate a failure report. Alternatively, if the failure detection apparatus 10 receives information indirectly indicating that a link fails, it may determine whether a link failure occurs through a preset rule and generate a failure report, where the preset rule may determine whether a measured target parameter reaches a threshold according to a configured parameter table to determine whether a link failure occurs. Still alternatively, if the failure detection apparatus 10 detects a specific event, for example, detects that information explicitly indicating that the current link has failed or information indirectly indicating that the link has failed is missing or times out, it may determine that a link failure has occurred and generate a failure report. It should be understood that the failure detection apparatus 10 may also detect whether the communication link has failed based on one or more of a direct message indication, an indirect message indication, and the occurrence of a particular event. Specifically, refer to step S10 in the above embodiment, which is not described herein again. If it is determined that a link failure has occurred, step S201 and step S301 are continuously performed, and if no link failure has occurred, step S202 is continuously performed. The specific implementation process of step S201 and step S301 may refer to step S20 and step S30 in the above embodiment, which is not described herein again.
In step S202, if the link has not failed, it is determined whether to perform a previous link recovery operation, i.e., a link pre-recovery operation, based on the status report. If N status reports are displayed to meet the condition for performing the link pre-recovery operation, and the determination result is that the link pre-recovery operation needs to be performed, step S302 is continuously performed to control the device related to the pre-failed communication link to perform a predetermined action to avoid the failure, and the specific steps may be performed by referring to the method described in step S30 in the foregoing embodiment. If M (M < N) status reports indicate that the link pre-recovery operation is performed, the determination result indicates that the link pre-recovery operation is not required to be performed, and step S303 is continuously performed to adjust at least one of a condition of whether a failure occurs and a condition of whether the link pre-recovery operation is required to be performed. The adjusted conditions are sent to the decider 22 of the fault handling means 20 and to the determination module 12 of the fault detection means 10.
Specifically, for example, the determination condition of whether or not a link failure occurs in step S101 is that the RSRP of the received signal is lower than the threshold a, and the determination condition of whether or not the link pre-recovery operation needs to be performed in step S202 is that the RSRP of the received signal is lower than the threshold B (a < B). When the RSRP of the received signal is C, A < C < B. Since a < C, a failure is not determined to have occurred, but a link status report is generated. If the status report is reported N times, where N is a predetermined threshold, then the N +1 st time of sending the status report of RSRP (condition a < C < B) is performed. If the status report reports M (M < N) times, M being a predetermined threshold, then control changes the conditions of decider 22 and decision block 12. For example, only the judgment condition of whether a failure occurs, i.e., the threshold of a is adjusted, and the adjusted parameter is sent to the determination module 12. It is also possible to adjust only the condition whether to perform the link pre-recovery operation, i.e., adjust the threshold of B, or the value of N, and send the adjusted parameter to the determiner 22. It is also possible to change both conditions, i.e. adjust the threshold value of a, the adjusted parameters being sent to the determination module 12; and a threshold value of B, or a value of N, and sends the adjusted parameter to the determiner 22.
Exemplary three scenarios for performing failure recovery on a functional unit where a link failure occurs will be described in detail below according to the difference in the locations of the failure detection apparatus 10 and the failure processing apparatus 20 (i.e., the failure detection apparatus 10 and the failure processing apparatus 20 may be located in the same or different units of the distributed base station system). It should be noted that the following scenarios one to three are only for the case where degradation of link quality occurs, not for the case where the link is completely disconnected.
Scenario one, when the link between the terminal and the remote unit fails:
if the failure detection apparatus 10 is inside the terminal, the terminal determines a link failure from the received information.
If the failure handling means 20 is internal to the terminal, the terminal will perform link recovery in the following exemplary manner. For example, the terminal may re-search for a remote unit (pRRU search), and the terminal may re-scan beams (Beam scanning) to search for an appropriate Beam.
If the link recovery processing unit is not within the terminal, the terminal sends a link failure report to the remote unit, or to the expansion unit, or to the host unit.
In particular if the fault handling means 20 is within the remote unit and the remote unit receives a link fault report sent directly or indirectly by the terminal. The remote unit may instruct the terminal to re-find the remote unit, which may be the remote unit currently connected to the terminal (remote unit reconnect) or the remote unit not currently connected to the terminal (remote unit switch). The remote unit connected to the terminal needs to instruct the terminal to perform remote unit reconnection or remote unit switching, and if the remote unit switching is to be performed, information of the remote unit switching instruction is required to be reported to the extension unit or the host unit connected to the remote unit which has sent the remote unit switching instruction. The remote unit may indicate to the terminal one remote unit after the handover or may provide candidates for a plurality of remote units that may be handed over.
If the fault handling means 20 is in the extension unit, the extension unit will receive a link fault report sent directly or indirectly by the terminal. The expansion unit may instruct the terminal to perform remote unit reconnection, or may instruct the terminal to perform remote unit handover via the remote unit. The extension unit may indicate to the terminal one remote unit after handover or may provide candidates for a plurality of remote units that may be handed over. If the expansion unit indicates the terminal to perform the remote unit switching, the expansion unit informs the remote unit currently connected with the terminal that the terminal will perform the remote unit switching.
If the fault handling means 20 is in the host unit, the host unit will receive a link fault report sent directly or indirectly by the terminal. The host unit may instruct the terminal to reconnect the remote units, or may instruct the terminal to switch the remote units. If the host unit instructs the terminal to perform remote unit switching, the host unit may notify the remote unit currently connected to the terminal that the terminal will perform remote unit switching. The host unit may indicate to the terminal one remote unit after the handover, or may provide candidates for a plurality of remote units that may be handed over.
If the failure detection means 10 is internal to the remote unit, the remote unit determines a link failure from the received information.
If the fault handling apparatus 20 is in a remote unit, the remote unit needs to instruct the terminal to perform remote unit reconnection or remote unit handover, and if the remote unit is to be handed over, it needs to report information for sending a remote unit handover instruction to an extension unit connected to the remote unit. The remote unit may indicate to the terminal one remote unit after the handover or may provide candidates for a plurality of remote units that may be handed over.
If the failure handling means 20 is not inside the remote unit, the remote unit sends a link failure report to the terminal, or to the extension unit, or to the host unit.
Specifically, if the failure handling apparatus 20 is internal to the terminal, the terminal will receive a link failure report sent directly or indirectly by the remote unit and perform link recovery in the following exemplary manner. For example, the terminal may re-search for the remote unit and the terminal may re-scan the beam.
If the fault handling means 20 is within the extension unit, the extension unit will receive a link fault report sent directly or indirectly by the remote unit. The extension unit may instruct the terminal to reconnect the remote units, or may instruct the terminal to switch the remote units. If the expansion unit indicates the terminal to perform the remote unit switching, the expansion unit informs the remote unit currently connected with the terminal that the terminal will perform the remote unit switching. The extension unit may indicate to the terminal one remote unit after handover or may provide candidates for a plurality of remote units that may be handed over.
If the fault handling means 20 is within the host unit, the host unit will receive a link fault report sent directly or indirectly by the remote unit. The host unit may instruct the terminal to reconnect the remote units, or may instruct the terminal to switch the remote units. If the host unit instructs the terminal to perform remote unit switching, the host unit may notify the remote unit currently connected to the terminal that the terminal will perform remote unit switching. If the host unit indicates the terminal to perform remote unit switching, the host unit notifies the remote unit currently connected with the terminal and the extension unit connected with the remote unit, and the terminal performs extension unit switching. The host unit may indicate to the terminal one remote unit after the handover, or may provide candidates for a plurality of remote units that may be handed over.
If the failure detection means 10 is internal to the extension unit, the extension unit determines a link failure from the received information.
If the fault handling device 20 is in an extension unit, the extension unit needs to instruct the terminal directly or indirectly through the remote unit to perform remote unit reconnection or remote unit switching. If the remote unit is to be switched, at least the information for sending the remote unit switching instruction needs to be sent to the remote unit connected with the terminal. If the target remote unit after the remote unit handover is not directly connected to the extension unit, the extension unit needs to send the information of the remote unit handover to the target remote unit or the extension unit connected to the target remote unit. If the expansion unit does not have the capability of cross-expansion unit communication, the expansion unit reports the switching information of the remote unit to the host unit connected with the expansion unit. The extension unit may indicate to the terminal one remote unit after handover or may provide candidates for a plurality of remote units that may be handed over.
If the failure handling means 20 is not inside the extension unit, the extension unit sends a link failure report to the terminal, either the remote unit or the host unit.
Specifically, if the failure processing apparatus 20 is inside the terminal, the terminal will receive a link failure report directly or indirectly transmitted by the extension unit, and perform link recovery in the following exemplary manner. For example, the terminal may re-search for remote units, and the terminal may re-scan the beam to find a suitable beam.
If the fault handling means 20 is in a remote unit, the remote unit will receive a link fault report sent directly or indirectly by the extension unit. The remote unit may instruct the terminal to reconnect the remote unit or may instruct the terminal to switch the remote unit. If the remote unit instructs the terminal to perform remote unit switching, the remote unit notifies the expansion unit connected to itself that the terminal will perform remote unit switching. The remote unit may indicate to the terminal one remote unit after the handover or may provide candidates for a plurality of remote units that may be handed over.
If the fault handling means 20 is within the host unit, the host unit will receive a link fault report sent directly or indirectly by the extension unit. The host unit may instruct the terminal to reconnect the remote units, or may instruct the terminal to switch the remote units. If the host unit instructs the terminal to perform remote unit switching, the host unit may notify the remote unit currently connected to the terminal that the terminal will perform remote unit switching. The host unit may indicate to the terminal one remote unit after the handover, or may provide candidates for a plurality of remote units that may be handed over.
If the failure detection device 10 is inside the host unit, the host unit determines a link failure from the received information.
If the fault handling device 20 is in the host unit, the host unit may instruct the terminal to perform remote unit reconnection directly or indirectly through at least one of the remote unit and the extension unit, or may instruct the terminal to perform remote unit handover. If the host unit instructs the terminal to perform remote unit switching, the host unit may notify the remote unit currently connected to the terminal that the terminal will perform remote unit switching. The host unit may indicate to the terminal one remote unit after the handover, or may provide candidates for a plurality of remote units that may be handed over.
If the failure handling means 20 is not inside the host unit, the host unit sends a link failure report to the terminal, either the remote unit or the extension unit.
Specifically, if the failure processing device 20 is inside the terminal, the terminal will receive a link failure report sent directly or indirectly by the host unit, and perform link recovery in the following exemplary manner. For example, the terminal may re-search for remote units, and the terminal may re-scan the beam to find a suitable beam.
If the fault handling device 20 is in a remote unit, the remote unit will receive a link fault report sent directly or indirectly by the host unit. The remote unit may instruct the terminal to reconnect the remote unit or may instruct the terminal to switch the remote unit. If the remote unit instructs the terminal to perform remote unit switching, the remote unit notifies the expansion unit connected to itself that the terminal will perform remote unit switching. The remote unit may indicate to the terminal one remote unit after the handover or may provide candidates for a plurality of remote units that may be handed over.
If the fault handling device 20 is in an extension unit, the extension unit needs to instruct the terminal directly or indirectly through the remote unit to perform remote unit reconnection or remote unit switching. If the remote unit is to be switched, at least the information for sending the remote unit switching instruction needs to be sent to the remote unit connected with the terminal. If the target remote unit after the remote unit handover is not directly connected to the extension unit, the extension unit needs to send the information of the remote unit handover to the target remote unit or the extension unit connected to the target remote unit. If the expansion unit does not have the capability of cross-expansion unit communication, the expansion unit reports the switching information of the remote unit to the host unit connected with the expansion unit. The extension unit may indicate to the terminal one remote unit after handover or may provide candidates for a plurality of remote units that may be handed over.
Scenario two, when the link between the remote unit and the extension unit fails:
if the failure detection apparatus 10 is inside the terminal, the terminal determines a link failure from the received information.
If the fault handling means 20 is internal to the terminal, the terminal may re-seek the remote unit.
If the failure handling means 20 is not inside the terminal, the terminal sends a link failure report to the remote unit, or to the extension unit, or to the host unit.
Specifically, if the fault handling means 20 is within the remote unit, the remote unit will receive a link fault report sent directly or indirectly by the terminal. The remote unit may instruct the terminal to switch the remote unit. The remote unit needs to report the information of the remote unit switching instruction to the extension unit or the host unit connected to the remote unit that sent the remote unit switching instruction. The remote unit may also switch the extension unit, and the remote unit needs to notify the switching information to the extension unit or the host unit connected before and after switching. The remote unit may indicate to the terminal one remote unit after the handover or may provide candidates for a plurality of remote units that may be handed over.
If the fault handling means 20 is in the extension unit, the extension unit will receive a link fault report sent directly or indirectly by the terminal. The extension unit may instruct the terminal to perform the remote unit handover, or may instruct the remote unit to perform the extension unit handover. If the expansion unit indicates the terminal to perform the remote unit switching, the expansion unit informs the remote unit currently connected with the terminal that the terminal will perform the remote unit switching. If the expansion unit indicates the remote unit to switch the expansion unit, the expansion unit informs the remote unit currently connected with the terminal and the host unit connected with the expansion unit, and the remote unit switches the expansion unit. The extension unit may indicate a switched extension unit to the remote unit, or may provide candidates for a plurality of switchable extension units.
If the fault handling means 20 is in the host unit, the host unit will receive a link fault report sent directly or indirectly by the terminal. The host unit may instruct the terminal to perform the remote unit handover, or may instruct the remote unit to perform the extension unit handover. If the host unit indicates the terminal to perform the remote unit switching, the host unit informs the remote unit currently connected with the terminal that the terminal will perform the remote unit switching. The host may indicate to the terminal one remote unit after the handover, or may provide candidates for a plurality of remote units that may be handed over. If the host unit indicates the remote unit to perform the extension unit switching, the host unit notifies the remote unit currently connected with the terminal and the extension unit connected with the remote unit, and the remote unit performs the extension unit switching. The host unit may indicate to the remote unit one switched extension unit, or may provide candidates for a plurality of switchable extension units.
If the failure detection means 10 is internal to the remote unit, the remote unit determines a link failure from the received information.
If the fault handling device 20 is in a remote unit, the remote unit needs to instruct the terminal to perform a remote unit handover or to switch the extension unit itself. The remote unit needs to report this information to the extension unit connected to it. The remote unit may indicate to the terminal one remote unit after the handover or may provide candidates for a plurality of remote units that may be handed over.
If the failure handling means 20 is not inside the remote unit, the remote unit sends a link failure report to the terminal, or to the extension unit, or to the host unit.
In particular, if the fault handling means 20 is internal to the terminal, the terminal will receive a link fault report sent directly or indirectly by the remote unit, and the terminal may switch the remote unit. The switched remote unit may be connected to the same extension unit as the current remote unit, or may be connected to a different extension unit from the current remote unit.
If the fault handling means 20 is within the extension unit, the extension unit will receive a link fault report sent directly or indirectly by the remote unit. The expansion unit may instruct the terminal to reconnect the remote unit through the remote unit, may instruct the terminal to switch the remote unit through the remote unit, and may instruct the remote unit to switch the expansion unit. The extension unit may indicate a switched extension unit to the remote unit, or may provide candidates for a plurality of switchable extension units. If the expansion unit indicates the remote unit to switch the expansion unit, the expansion unit informs the host unit connected with the expansion unit, and the remote unit switches the expansion unit.
If the fault handling means 20 is within the host unit, the host unit will receive a link fault report sent directly or indirectly by the remote unit. The host unit can instruct the terminal to switch the remote units through the extension unit and the remote units, and can also instruct the remote units to switch the extension units through the extension units. The host may indicate to the terminal one remote unit after the handover, or may provide candidates for a plurality of remote units that may be handed over. The host unit may indicate to the remote unit one switched extension unit, or may provide candidates for a plurality of switchable extension units.
If the failure detection means 10 is internal to the extension unit, the extension unit determines a link failure from the received information.
If the fault handling means 20 is in the extension unit, the extension unit needs to instruct the terminal to perform a remote unit handover via the remote unit. The extension unit may indicate to the terminal one remote unit after handover or may provide candidates for a plurality of remote units that may be handed over. If the target remote unit after the remote unit handover is not directly connected to the extension unit, the extension unit needs to send the information of the remote unit handover to the target remote unit or the extension unit connected to the target remote unit. If the expansion unit does not have the capability of cross-expansion unit communication, the expansion unit reports the switching information of the remote unit to the host unit connected with the expansion unit. The expansion unit can also instruct the remote unit to switch the expansion unit and report the information at least to the host unit connected with the expansion unit. The extension unit may indicate a switched extension unit to the remote unit, or may provide candidates for a plurality of switchable extension units.
If the failure handling means 20 is not inside the extension unit, the extension unit sends a link failure report to the terminal, either the remote unit or the host unit.
Specifically, if the failure handling means 20 is internal to the terminal, the terminal will receive the link failure report sent indirectly by the extension unit and re-find the remote unit.
If the fault handling means 20 is in a remote unit, the remote unit will receive a link fault report sent directly or indirectly by the extension unit. The remote unit may instruct the terminal to perform a remote unit handover. If the remote unit instructs the terminal to perform remote unit switching, the remote unit notifies the expansion unit connected to itself that the terminal will perform remote unit switching. The remote unit may also re-find the extension unit and report this information to the extension unit connected to itself. The remote unit may indicate to the terminal one remote unit after the handover or may provide candidates for a plurality of remote units that may be handed over.
If the fault handling means 20 is within the host unit, the host unit will receive a link fault report sent directly or indirectly by the extension unit. The host unit can instruct the terminal to switch the remote units through the extension unit and the remote units, and can also instruct the remote units to switch the extension units through the extension units. If the host unit instructs the terminal to perform the remote unit switching through the extension unit and the remote unit, the host unit may notify the remote unit currently connected to the terminal that the terminal will perform the remote unit switching. The host unit may indicate to the terminal one remote unit after the handover, or may provide candidates for a plurality of remote units that may be handed over. If the host unit instructs the remote unit to perform an extension unit switch, the host unit notifies the current extension unit. The host unit may indicate to the remote unit one switched extension unit, or may provide candidates for a plurality of switchable extension units.
If the failure detection device 10 is inside the host unit, the host unit determines a link failure from the received information.
If the fault handling device 20 is in the host unit, the host unit may instruct the terminal to perform remote unit switching through the extension unit and the remote unit, or may instruct the remote unit to perform extension unit switching through the extension unit. If the host unit instructs the terminal to perform remote unit switching, the host unit may notify the remote unit currently connected to the terminal that the terminal will perform remote unit switching. The host unit may indicate to the terminal one remote unit after the handover, or may provide candidates for a plurality of remote units that may be handed over. If the host unit instructs the remote unit to perform an extension unit switch, the host unit notifies the current remote unit and the extension unit connected to the remote unit. The host unit may indicate a switched extension unit to the remote end, or may provide candidates for a plurality of switchable extension units.
If the failure handling means 20 is not inside the host unit, the host unit sends a link failure report to the terminal, either the remote unit or the extension unit.
Specifically, if the failure handling device 20 is internal to the terminal, the terminal will receive a link failure report sent directly or indirectly by the host unit and switch the remote unit.
If the fault handling device 20 is in a remote unit, the remote unit will receive a link fault report sent directly or indirectly by the host unit. The remote unit may instruct the terminal to perform a remote unit handover. If the remote unit instructs the terminal to perform remote unit switching, the remote unit notifies the expansion unit connected to itself that the terminal will perform remote unit switching. The remote unit may indicate to the terminal one remote unit after the handover or may provide candidates for a plurality of remote units that may be handed over. The remote unit may also switch the extension unit and inform the extension unit currently connected to itself.
If the fault handling device 20 is in an extension unit, the extension unit needs to instruct the terminal directly or indirectly through the remote unit to perform remote unit reconnection or remote unit switching. If the remote unit is to be switched, at least the information for sending the remote unit switching instruction needs to be sent to the remote unit connected with the terminal. If the target remote unit after the remote unit handover is not directly connected to the extension unit, the extension unit needs to send the information of the remote unit handover to the target remote unit or the extension unit connected to the target remote unit. If the expansion unit does not have the capability of cross-expansion unit communication, the expansion unit reports the switching information of the remote unit to the host unit connected with the expansion unit. The extension unit can also instruct the remote unit connected with the extension unit to switch the extension unit and report the switching information to the host unit connected with the extension unit.
Scenario three, when the link between the extension unit and the host fails:
if the failure detection apparatus 10 is inside the terminal, the terminal determines a link failure from the received information.
If the fault handling means 20 is internal to the terminal, the terminal may re-seek the remote unit.
If the failure handling means 20 is not inside the terminal, the terminal sends a link failure report to the remote unit, or to the extension unit, or to the host unit.
Specifically, if the fault handling means 20 is within the remote unit, the remote unit will receive a link fault report sent directly or indirectly by the terminal. The remote unit may switch the extension unit, and the remote unit needs to notify the extension unit or the host unit connected before and after the switching of the switching information.
If the fault handling means 20 is in the extension unit, the extension unit will receive a link fault report sent directly or indirectly by the terminal. The expansion unit may instruct the remote unit to perform expansion unit switching, or may switch the host unit. If the expansion unit instructs the remote unit to perform expansion unit switching, the expansion unit notifies the host unit connected to itself. The extension unit may indicate a switched extension unit to the remote unit, or may provide candidates for a plurality of switchable extension units. If the expansion unit switches the host unit, the expansion unit informs the remote unit and the host unit connected with the expansion unit.
If the fault handling means 20 is in the host unit, the host unit will receive a link fault report sent directly or indirectly by the terminal. The host unit can instruct the remote unit to switch the extension unit through the extension unit, and can also instruct the extension unit to switch the host unit.
If the failure detection means 10 is internal to the remote unit, the remote unit determines a link failure from the received information.
If the fault handling device 20 is in a remote unit, the remote unit needs to switch the extension unit. The remote unit may also request the extension unit to which it is connected to switch the host unit.
If the failure handling means 20 is not inside the remote unit, the remote unit sends a link failure report to the terminal, or to the extension unit, or to the host unit.
In particular, if the fault handling means 20 is internal to the terminal, the terminal will receive a link fault report sent directly or indirectly by the remote unit, and the terminal may switch the remote unit. The terminal may request the remote unit to which it is connected to switch the extension unit.
If the fault handling means 20 is within the extension unit, the extension unit will receive a link fault report sent directly or indirectly by the remote unit. The expansion unit may instruct the remote unit to perform expansion unit switching or host unit switching. And reports the information to the host unit connected to itself. The extension unit may indicate a switched extension unit to the remote unit, or may provide candidates for a plurality of switchable extension units.
If the fault handling means 20 is within the host unit, the host unit will receive a link fault report sent directly or indirectly by the remote unit. The host unit can instruct the remote unit to switch the extension unit through the extension unit, and can also instruct the extension unit to switch the host unit. The host unit may indicate one switched extension unit to the extension unit, or may provide candidates for a plurality of switchable extension units.
If the failure detection means 10 is internal to the extension unit, the extension unit determines a link failure from the received information.
If the fault handling device 20 is within an extension unit, the extension unit may instruct the remote unit to perform an extension unit handover. The expansion unit can also switch the host unit and report the information at least to the host unit connected with the expansion unit. The extension unit may indicate a switched extension unit to the remote unit, or may provide candidates for a plurality of switchable extension units.
If the failure handling means 20 is not inside the extension unit, the extension unit sends a link failure report to the terminal, either the remote unit or the host unit.
Specifically, if the failure handling means 20 is internal to the terminal, the terminal will receive the link failure report sent indirectly by the extension unit and re-find the remote unit.
If the link recovery processing unit is in the remote unit, the remote unit will receive a link failure report sent directly or indirectly by the expansion unit. The remote unit may switch the expansion unit or request the expansion unit to perform a host unit switch.
If the fault handling means 20 is within the host unit, the host unit will receive a link fault report sent directly or indirectly by the extension unit. The host unit can instruct the remote unit to switch the extension unit through the extension unit, and can also instruct the extension unit to switch the host unit. The host unit may indicate to the remote unit one switched extension unit, or may provide candidates for a plurality of switchable extension units. The host unit may indicate one switched extension unit to the extension unit, or may provide candidates for a plurality of switchable extension units.
If the failure detection device 10 is inside the host unit, the host unit determines a link failure from the received information.
If the fault handling device 20 is in the host unit, the host unit may instruct the remote unit to perform the extension unit switch via the extension unit, or may instruct the extension unit to perform the host unit switch. The host unit may indicate to the remote unit one switched extension unit, or may provide candidates for a plurality of switchable extension units. The host unit may indicate one switched extension unit to the extension unit, or may provide candidates for a plurality of switchable extension units.
If the failure handling means 20 is not inside the host unit, the host unit sends a link failure report to the terminal, either the remote unit or the extension unit.
Specifically, if the failure handling device 20 is internal to the terminal, the terminal will receive a link failure report sent directly or indirectly by the host unit and switch the remote unit. The terminal may also request the remote unit to which it is connected to switch the extension unit.
If the link failure handling apparatus 20 is in a remote unit, the remote unit will receive a link failure report sent directly or indirectly by the host unit. The remote unit may instruct the terminal to perform remote unit switching, may also perform extension unit switching, and may also request the extension unit to perform host unit switching.
If the fault handling device 20 is in an extension unit, the extension unit may instruct a remote unit connected to itself to switch the extension unit, or may switch the host unit itself. The extension unit at least needs to report the information to the host unit connected with the extension unit.
It is to be understood that in the chain type connection shown in fig. 2B and the hybrid connection shown in fig. 2C, the determination and recovery process of the link failure between the expansion units is similar to the determination and recovery process of the link failure between the expansion unit and the remote unit (or the expansion unit and the host unit), and will not be described again.
In another embodiment, when the failure detection means 10 detects that there is a complete link disconnection, e.g. the link between the remote unit and the expansion unit is completely disconnected and the failure handling means 20 is internal to the expansion unit, the expansion unit will directly adjust the parameters to reconnect the link without indication of a handover.
It should be understood that the failure detection means 10 and the failure processing means 20 may be located in the same or different functional units of the distributed base station system, and the failure detection means 10 and the failure processing means 20 may also be located outside the respective functional units of the distributed base station system as separate means or as a whole, for controlling the different units in the system to perform the link recovery operation.
In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when executed by a processor, performs the steps of:
detecting whether the communication link is failed based on one or more of the direct message indication, the indirect message indication and the occurrence of a specific event, and generating a link failure report when the failure occurs; determining whether to perform a link recovery operation based on the link failure report; and controlling the device involved in the failed communication link to perform a predetermined action to remove the failure when it is determined that the link recovery operation needs to be performed.
In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when executed by a processor, performs the steps of:
detecting whether a communication link is down based on one or more of a direct message indication, an indirect message indication, and an occurrence of a particular event associated with one or more devices in the distributed base station system; and generating a link failure report upon detecting a failure, wherein the link failure report indicates that a communication link between a first device and a second device immediately downstream thereof in the distributed base station system has failed.
For specific limitations and implementation of the above steps, reference may be made to the above embodiments of the link failure detection and processing method, which are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The above detailed description is provided for a method, a system, a device, and a storage medium for detecting and processing a link failure in a distributed base station system according to embodiments of the present invention, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (22)

1. A link failure detection and processing method is used for a distributed base station system, and is characterized in that the method comprises the following steps:
detecting whether a communication link is failed based on one or more of the direct message indication, the indirect message indication and the occurrence of a specific event, and generating a link failure report when the failure occurs and a link state report when the failure does not occur;
determining whether to perform a link recovery operation based on the link failure report; and
when judging that the link recovery operation needs to be executed, controlling equipment related to the communication link with the fault to implement a preset action so as to eliminate the fault;
determining whether to perform a link pre-recovery operation based on the link status report; and
when judging that the link pre-recovery operation needs to be executed, controlling equipment related to a communication link which is pre-failed to implement a preset action so as to avoid the occurrence of the failure;
the judging condition of whether the communication link has link failure is that the received signal energy is lower than a first preset threshold, and the triggering condition of whether the link pre-recovery operation needs to be executed is that the received signal energy is lower than a second preset threshold, wherein the first preset threshold is smaller than the second preset threshold;
when the received signal energy is between the first preset threshold and the second preset threshold, meeting a preset trigger condition for executing link pre-recovery operation and generating a link state report, and then accumulating the generation times of the link state report;
when the link state report with the number of times greater than the first preset number indicates that the current communication link state meets the preset trigger condition of the link pre-recovery operation, executing the link pre-recovery operation;
when the link state report with the frequency less than the first preset frequency and greater than the second preset frequency indicates that the current communication link state meets the preset triggering condition of the link pre-recovery operation, judging that the link pre-recovery operation is not executed, and adjusting at least one of the size of a first preset threshold value in the judging condition of whether the communication link has a link fault, the size of a second preset threshold value in the triggering condition of whether the link pre-recovery operation needs to be executed, and the value of the first preset frequency.
2. The link failure detection and processing method of claim 1, wherein the link failure report indicates that a communication link between a first device and a second device immediately downstream thereof has failed.
3. The link failure detection and processing method of claim 1, wherein the direct message indication is a message indication directly indicating that a communication link has failed.
4. The link failure detection and processing method of claim 1, wherein the indirect message indication comprises one or more of:
the energy of a reference signal provided by one device to another device in the distributed base station system is reduced to be below a preset threshold value;
the error rate of a reference signal provided by one device to another device in the distributed base station system exceeds a preset threshold value; or
And the hybrid automatic repeat request information feedback state of the reference signal provided by one device to another device in the distributed base station system is that the number of times of scheduling failure exceeds a preset threshold value.
5. The link failure detection and handling method of claim 1, wherein the specific event comprises one or more of:
if one device in the distributed base station system does not receive an indication of normal detachment of another device, and if the other device needs to periodically send a direct message indication or an indirect message indication indicating that a communication link fails to the one device, but the direct message indication or the indirect message indication is not reported at a specified time; or
If a device in the distributed base station system does not receive an indication of a normal detachment of another device, and if the other device requires demand-based feedback to the device, but fails to make the feedback.
6. The method for detecting and handling link failure according to claim 1, wherein the step of detecting whether the communication link is failed further comprises: the method comprises the steps that a first preset device in the distributed base station system detects whether a communication link fails or not based on one or more of the direct message indication, the indirect message indication and the occurrence of a specific event from an upstream device and/or a downstream device of the first preset device, wherein the first preset device can trigger the upstream device and/or the downstream device of the first preset device to actively measure and report the indirect message indication.
7. The link failure detection and handling method of claim 6, wherein the first predetermined device is one of a host unit, an expansion unit, a remote unit, and a terminal.
8. The method of claim 2, wherein the step of controlling the devices involved in the failed communication link to perform predetermined actions to resolve the failure further comprises at least one of:
one of the first device and the second device performing a link reconnection; or
The second device or a third device downstream of the second device performs a link handover.
9. The method of link failure detection and handling of claim 8, wherein the link reconnect further comprises: and after the communication parameters of at least one of the first equipment and the second equipment are adjusted, carrying out link reconnection.
10. The link failure detection and handling method of claim 8, wherein the link switching further comprises:
providing a list of candidate devices for switching the first device to the second device when the second device performs link switching; and
providing a list of candidate devices for switching the second device to the third device when the third device performs link switching;
the candidate device list for switching the first device may include devices other than the first device connected upstream of the second device and/or devices connected upstream of the second device and having no fault report that is the same as or similar to the first device;
the candidate device list for switching the second device may include devices other than the second device connected upstream of the third device and/or devices connected upstream of the third device and having not reported a fault report that is the same as or similar to the second device.
11. The method for link failure detection and processing of claim 1 wherein the step of determining whether to perform a link recovery operation based on the link failure report further comprises: and judging whether to execute the link recovery operation according to a preset rule.
12. The method for detecting and handling link failure as claimed in claim 6, wherein a second predetermined device in the distributed base station system determines whether to perform the link recovery operation based on the link failure report and triggers the device involved in the failed communication link to perform a predetermined action if it is determined to perform the link recovery operation, wherein the second predetermined device is the same as or different from the first predetermined device.
13. The link failure detection and handling method of claim 1, wherein the step of controlling the devices involved in the pre-failed communication link to perform the predetermined action to avoid the failure further comprises at least one of:
performing a link reconnection by a first device in the communication link where the failure has occurred and one of second devices downstream thereof; or
The second device or a third device downstream of the second device performs a link handover.
14. A link failure detection and handling system for a distributed base station system, the system comprising:
fault detection means for detecting whether a communication link is faulty based on one or more of the direct message indication, the indirect message indication and the occurrence of a specific event, and generating a link fault report when a fault occurs; when no fault occurs, generating a link state report; and
fault processing means for judging whether or not to perform a link recovery operation based on the link fault report, and controlling a device relating to the communication link in which the fault has occurred to perform a predetermined action to eliminate the fault when it is judged that the link recovery operation needs to be performed; the link state report is used for judging whether to execute a link pre-recovery operation or not; when judging that the link pre-recovery operation needs to be executed, controlling equipment related to a communication link which is pre-failed to implement a preset action so as to avoid the occurrence of the failure;
the failure processing apparatus includes:
a receiver for receiving said link failure report from said failure detection means and for receiving said link status report from said failure detection means;
a judger for judging whether to execute link recovery operation according to the received link failure report and judging whether to execute link pre-recovery operation according to the received road state report; the judging condition of whether the communication link has link failure is that the received signal energy is lower than a first preset threshold, and the triggering condition of whether the link pre-recovery operation needs to be executed is that the received signal energy is lower than a second preset threshold, wherein the first preset threshold is smaller than the second preset threshold; when the received signal energy is between the first preset threshold and the second preset threshold, meeting a preset trigger condition for executing link pre-recovery operation and generating a link state report, and then accumulating the generation times of the link state report;
a controller for controlling the device relating to the communication link in which the failure has occurred to perform a predetermined action to eliminate the failure when the link recovery operation is performed, and for controlling the device relating to the communication link in which the failure has occurred to perform a predetermined action to avoid the failure when the link pre-recovery operation is performed; and
an adjuster, configured to, when there is a link state report greater than a first preset number of times indicating that a current communication link state satisfies a preset trigger condition for a link pre-restoration operation, determine to perform the link pre-restoration operation by the determiner; and the judging unit is further configured to judge that the link pre-recovery operation is not performed when there is a link state report smaller than a first preset number of times and larger than a second preset number of times indicating that the current communication link state satisfies a preset trigger condition of the link pre-recovery operation, and the adjusting unit adjusts at least one of a size of a first preset threshold in the judgment condition of whether the communication link is failed, a size of a second preset threshold in the trigger condition of whether the link pre-recovery operation needs to be performed, and a value of the first preset number of times.
15. The link failure detection and processing system of claim 14,
wherein controlling the device involved in the failed communication link to perform the predetermined action comprises performing at least one of:
performing a link reconnect by one of the first device and the second device of the failed communication link; or
The second device or a third device downstream of the second device performs a link handover.
16. The link failure detection and processing system of claim 15,
the controller is further configured to: providing a list of candidate devices for switching the first device to the second device when the second device performs link switching; and
providing, to the third device, a list of candidate devices for switching the second device when the third device performs link switching.
17. The link failure detection and processing system of claim 14,
wherein controlling the device involved in the pre-failed communication link to perform the predetermined action comprises performing at least one of:
performing a link reconnect by one of the first device and the second device of the communication link in which the failure occurred; or
The second device or a third device downstream of the second device performs a link switch.
18. The link failure detection and processing system of claim 17, wherein the controller is further configured to:
providing the third apparatus with a list of candidate devices for switching the first apparatus when the second apparatus performs link switching; and
providing the third apparatus with a list of candidate devices for handing over the second apparatus when the third apparatus performs link handover.
19. A link failure detection method for a distributed base station system, the method comprising:
detecting whether a communication link is malfunctioning based on one or more of a direct message indication, an indirect message indication, and an occurrence of a particular event associated with one or more devices in the distributed base station system; and
generating a link failure report when a failure is detected, and generating a link state report when no failure is detected; wherein the link failure report indicates that a communication link between a first device and a second device immediately downstream thereof in the distributed base station system has failed; the link state report indicating a likelihood of failure of a communication link between a first device and a second device immediately downstream thereof in the distributed base station system;
the judging condition of whether the communication link has link failure is that the received signal energy is lower than a first preset threshold, and the triggering condition of whether the link pre-recovery operation needs to be executed is that the received signal energy is lower than a second preset threshold, wherein the first preset threshold is smaller than the second preset threshold;
the trigger condition for generating the link status report is that the received signal energy is between the first preset threshold and the second preset threshold.
20. A fault detection device for a distributed base station system, the fault detection device comprises;
an acquisition module for acquiring one or more of a direct message indication, an indirect message indication and an occurrence of a specific event related to one or more devices in a distributed base station system;
a determining module for determining whether a communication link is failed based on one or more of the obtained direct message indication, indirect message indication, and occurrence of a specific event;
and a generating module for generating a link failure report when it is determined that a failure has occurred and a link status report when it is determined that no failure has occurred, wherein the link failure report indicates that a communication link between a first device and a second device immediately downstream thereof in the distributed base station system has failed; and the link status report indicates a likelihood of failure of a communication link between a first device and a second device immediately downstream thereof in the distributed base station system;
the judging condition of whether the communication link has link failure is that the received signal energy is lower than a first preset threshold, and the triggering condition of whether the link pre-recovery operation needs to be executed is that the received signal energy is lower than a second preset threshold, wherein the first preset threshold is smaller than the second preset threshold;
the trigger condition for generating the link status report is that the received signal energy is between the first preset threshold and the second preset threshold.
21. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, implements the link failure detection and processing method according to any one of claims 1 to 12.
22. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the link failure detection method according to claim 19.
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