Method and system for 5g base station to automatically acquire length of neighbor cell gnb id

Abstract

The present application relates to a kind of 5G base station automatic acquisition adjacent area gNB ID length method, belong to communication technical field, solve the problem that the gNB ID length of adjacent area cannot be obtained in prior art causes handover failure.Specific steps include: 5G base station uses ANR enhancement strategy module to set the initial gNB ID length of adjacent area respectively;Combining initial gNB ID length obtains target base station ID to be switched and initiates handover preparation request to core network;Core network is in response to handover preparation request, when it cannot be matched target base station due to gNB ID length error, reply corresponding failure message;When finding matched target base station, gNB ID length is correct adjacent area gNB ID length at this time;5G base station combines failure message, uses ANR enhancement strategy module to adjust initial gNB ID length, carries out strategy handover adjacent area attempt, to obtain correct adjacent area gNB ID length, realizes adjacent area information acquisition full automation.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of communication, in particular to a method and system for automatically obtaining the length of a gNB ID of a neighboring area of a 5G base station. BACKGROUND

[0002] When a 5G base station is running, it will automatically detect other base stations around it and establish a neighboring area relationship with these base stations, which is called the automatic addition of a neighboring area process. Through the automatic addition of a neighboring area, the 5G network can better allocate resources and optimize signals to ensure the stability and performance of the network. When a mobile device switches between different base stations, the network can more efficiently manage data transmission and communication connections, improving the communication quality and experience of users. The GNodeB 5G base station (referred to as 5G base station) is a new base station technology in the 5G era, used to provide wireless network coverage and communication services. In the automatic addition of a neighboring area (ANR) process, the CGI (Common Gateway Interface) measurement is issued to instruct the user equipment (UE) to report the CGI information of the neighboring area in the Measurement Report, but the CGI information defined in the 3GPP protocol does not indicate the length of the gNB ID, and the wrong length of the gNB ID will cause the switching to fail.

[0003] To solve the above problems, the traditional 5G base station usually adopts the following solutions: solution 1, fixing the length of the gNB ID as the commonly used gNB ID length of the surrounding macro station or small base station during the automatic addition of a neighboring area; solution 2, adding a gNBIDBitLength field in the PLMNIdentityInfoList field in the CGI-InfoNR field in the Measurement Report message reported by the UE, which is used to indicate the length of the gNB ID of the neighboring area; solution 3, configuring the cellIdentity in the CGI-InfoNR as multiple components according to a preset mode, so as to extract the required information from the configured base station identification information.

[0004] However, the above solutions all have disadvantages: in solution 1, the gNB ID lengths of 5G home small base stations and macro stations may be different, and it is difficult to meet the mobility requirements of all scenarios by fixing the length of the gNB ID; in solution 2, the fields in the 3GPP protocol are modified, and the base station and the terminal need to support the protocol version containing the modified fields at the same time, which is difficult to implement; in solution 3, the composition rule of the cellIdentity is preset, and the network needs to be planned according to this rule to allocate parameters, which is not easy to operate. SUMMARY

[0005] In view of the above analysis, the embodiments of the present application aim to provide a method for a 5G base station to automatically obtain the length of a gNB ID of a neighboring cell, so as to solve the problem of handover failure caused by the inability to obtain the length of the gNB ID of the neighboring cell in the prior art.

[0006] The purpose of the present application is mainly achieved by the following technical solutions:

[0007] In one aspect, the embodiments of the present application provide a method for a 5G base station to automatically obtain the length of a gNB ID of a neighboring cell, comprising the following steps:

[0008] The 5G base station automatically adds a neighboring cell according to a CGI measurement report periodically reported by a user equipment, and sets the initial gNB ID length of each neighboring cell by using an ANR enhancement strategy module;

[0009] According to the physical cell identifier carried by the CGI measurement report, the target neighboring cell to be switched is determined, and the target base station ID to be switched is obtained in combination with the initial gNB ID length of the target neighboring cell, and a handover preparation request is initiated to a core network;

[0010] The core network responds to the handover preparation request, and finds the target base station according to the target base station ID to be switched; when the target base station cannot be matched due to an error in the length of the gNB ID, the corresponding failure message is included in the handover preparation failure information element in the reply message; when the matched target base station is found, the length of the gNB ID is the correct length of the gNB ID of the neighboring cell at this time;

[0011] The 5G base station adjusts the length of the gNB ID of the neighboring cell by using the ANR enhancement strategy module according to the corresponding failure message in the reply, and attempts to switch the neighboring cell in a strategy to obtain the correct length of the gNB ID of the neighboring cell.

[0012] Further, the corresponding failure message includes adding a gNB ID mismatch reason value in the failure cause information of the handover preparation failure information element, which is used to indicate the matching result of the length of the gNB ID under the handover preparation failure cause.

[0013] Further, the attempt to switch the neighboring cell in a strategy includes:

[0014] The corresponding target base station ID to be switched is calculated by using the adjusted length of the gNB ID;

[0015] Based on the corresponding target base station ID to be switched, a handover preparation request is initiated to the core network again; when the matched target base station is found, the attempt to switch the neighboring cell in a strategy is exited, and the correct length of the gNB ID of the neighboring cell is obtained; otherwise, the current handover attempt fails.

[0016] Further, when the gNB ID length of the neighbor cell is adjusted, and the strategy switching neighbor cell attempt fails, as an abnormal protection, the gNB ID length of the cell of the base station is set as the correct gNB ID length of the neighbor cell.

[0017] Further, the adjusting the gNB ID length of the neighbor cell comprises:

[0018] The gNB ID length range is divided into i length values with 1 as the step, each length value is taken as the adjusted gNB ID length, and the strategy switching neighbor cell attempt is sequentially performed.

[0019] Further, the adjusting the gNB ID length of the neighbor cell further comprises:

[0020] The gNB ID length range is divided into i4 length values with 4 as the step, as the first round of strategy switching neighbor cell attempt, each length value is taken as the adjusted gNB ID length, and the strategy switching neighbor cell attempt is sequentially performed.

[0021] When the i4th switching neighbor cell attempt fails, the gNB ID length range is divided into i2 length values with 2 as the step, as the second round of strategy switching neighbor cell attempt, each length value is taken as the adjusted gNB ID length, and the strategy switching neighbor cell attempt is sequentially performed.

[0022] When the i2th switching neighbor cell attempt fails, the gNB ID length range is divided into i length values with 1 as the step, as the third round of strategy switching neighbor cell attempt, each length value is taken as the adjusted gNB ID length, and the strategy switching neighbor cell attempt is sequentially performed.

[0023] Further, the target base station ID to be switched is calculated based on the following formula by using the cellIdentity and the gNB ID length:

[0024] Target cell ID = gNB ID * 2 36-(InitialLength+AdjustLength) + cell ID,

[0025]

[0026] wherein, InitialLength is the initial length of the gNB ID; AdjustLength is the gNB ID length adjustment parameter, indicating that the target cell ID needs to be adjusted after the switching fails; L represents the Lth round of gNB ID length switching neighbor cell attempt of the 5G base station; and n represents the nth switching attempt in the Lth round.

[0027] Further, the length of the adjacent gNB ID is added to the adjacent list, and the correct length of the adjacent gNB ID obtained is directly used for the next adjacent switching execution process by updating the adjacent list.

[0028] In another aspect, the embodiment of the present application provides a system for automatically obtaining the length of the adjacent gNB ID of a 5G base station, comprising:

[0029] The 5G base station configured with the ANR enhancement strategy module is used to set the initial gNB ID length of each adjacent area by using the ANR enhancement strategy module; the target base station ID to be switched is obtained in combination with the initial gNB ID length of the target adjacent area, and a handover preparation request is initiated to the core network; and according to the corresponding failure message in the reply, the initial gNB ID length is adjusted by using the ANR enhancement strategy module, and the strategy switching adjacent area is attempted to obtain the correct length of the adjacent gNB ID;

[0030] The user equipment is used to measure and periodically report the CGI measurement report according to the CGI measurement control message issued by the 5G base station.

[0031] The core network is used to find the target base station according to the target base station ID to be switched in response to the handover preparation request; wherein when the target base station cannot be matched due to the error of the gNB ID length, the corresponding failure message is included in the handover preparation failure information element in the reply message.

[0032] Further, by modifying the information element protocol of the 5G base station and the core network, the gNB ID mismatch reason value is added to the failure reason information in the handover preparation failure information element, which is used to indicate the matching result of the gNB ID length in the handover preparation failure reason.

[0033] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0034] 1. The present application proposes to add an ANR enhancement strategy module in the 5G base station, adjust the gNB ID length of the adjacent area according to the set strategy, and determine the final gNB ID length of the adjacent area by means of the signaling interaction result of the 5G base station and the core network in the handover process, so as to realize the full automation of the acquisition of the adjacent area information.

[0035] 2. The basic information (PLMN, CID, PCI, EARFCN) of the adjacent area obtained by the traditional ANR is further enhanced by adding the gNB ID length information, and the handover adjacent area process is carried out, so as to solve the problem of handover failure caused by the failure to obtain the gNB ID length of the adjacent area in the actual application of the 5G base station.

[0036] 3. With the signaling interaction results of the 5G base station and the core network in the switching process, the final gNB ID length of the neighboring area is determined, without manual participation, and all modifications only need to be made on the base station side, which has strong implementability.

[0037] In the present application, the above technical solutions can also be combined with each other to realize more preferred combination solutions. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification, or will be understood by implementing the present application. The purpose and other advantages of the present application can be realized and obtained from the contents specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and serve to explain the principles of the application. It should be understood that these drawings are only representative and are not necessarily drawn to scale.

[0039] Figure 1 Flow chart of the method for the 5G base station of the embodiment of the present application to automatically obtain the gNB ID length of the neighboring area;

[0040] Figure 2 Flow chart of the switching attempt process of the embodiment of the present application;

[0041] Figure 3 Flow chart of the automatic addition of the neighboring area process of the embodiment of the present application. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present application will be specifically described below in conjunction with the drawings, wherein the drawings constitute a part of this application and are used to illustrate the principles of the embodiments of the present application and are not intended to limit the scope of the present application.

[0043] Embodiment 1

[0044] In one specific embodiment of the present application, a method for a 5G base station to automatically obtain the gNB ID length of the neighboring area is disclosed, as shown in Figure 1 The method comprises the following steps:

[0045] Step S1, the 5G base station automatically adds a neighboring area according to the CGI measurement report reported by the UE, and sets the initial gNB ID length of each neighboring area by using an ANR enhancement strategy module;

[0046] Step S2, the target neighboring area to be switched is determined according to the physical cell identifier of the neighboring base station carried by the CGI measurement report; the target base station ID to be switched is obtained in combination with the initial gNB ID length of the target neighboring area, and a switching preparation request is initiated to the core network;

[0047] Step S3, the core network responds to the handover preparation request, and finds the target base station according to the target base station ID; wherein when the target base station cannot be matched due to the length error of the gNB ID, the corresponding failure message is included in the handover preparation failure information element in the reply message; when the matched target base station is found, the length of the gNB ID is the correct length of the neighboring gNB ID at this time;

[0048] Step S4, the 5G base station adjusts the initial gNB ID length according to the corresponding failure message in the reply by using the ANR enhanced strategy module according to the formulated strategy, attempts to switch the neighboring area, and obtains the correct length of the neighboring gNB ID.

[0049] Through the above method, by adding an ANR enhanced strategy module in the 5G base station, the correct length of the neighboring gNB ID is determined by attempting to switch the neighboring area according to the strategy during the preparation phase of the neighboring area switching, the problem of handover failure caused by the failure to obtain the length of the gNB ID of the neighboring area in the actual application of the 5G base station is solved, and manual intervention is not required, all modifications only need to be made on the base station side, and the implementation is strong.

[0050] Specifically, in step S1, when switching the neighboring area, the 5G base station continuously monitors the signal strength and quality of the surrounding neighboring area, and periodically issues a CGI measurement control message. The UE measures the neighboring area according to the measurement control message issued by the base station and periodically reports a measurement report. The 5G base station automatically adds the cells of the neighboring base station as neighboring areas according to the CGI measurement report, and adds the corresponding length of the neighboring gNB ID information in the neighboring area list, and the ANR enhanced strategy module sets the initial length of the neighboring gNB ID for the neighboring area.

[0051] Specifically, in step S2, the 5G base station determines the priority and handover decision of the neighboring area to be switched according to the physical cell identifier (PCI) information of the neighboring base station carried in the A3 / A5 measurement events in the measurement report periodically reported by the UE, in order to optimize the network coverage and capacity and improve the communication quality. Among them, the A3 event refers to the neighboring area in the measurement report whose RSRP (Reference Signal Received Power) difference with the current Serving Cell is less than the A3 threshold value; the A5 event refers to the neighboring area in the measurement report whose RSRP difference with the current Serving Cell is greater than the A3 threshold value but less than the A5 threshold value.

[0052] Specifically, the CGI-info information element in the CGI measurement report is used to indicate the relevant information of cell access, and the cellIdentity information therein represents the unique identifier of a cell in a 5G network. The gNB ID of the target base station to be switched is calculated using the cellIdentity of the neighboring cell and the initial gNB ID length. The calculated target base station ID to be switched is filled into the Handover Required message, and a handover preparation request is initiated to the core network.

[0053] Further, the gNB ID of the target base station to be switched is calculated based on the following formula:

[0054] Target Cell ID = gNB ID * 2 36-(InitialLength+AdjustLength) + cellID,

[0055] wherein InitialLength is the initial length of the gNB ID, which can be configured through an operation interface; AdjustLength is the length adjustment parameter of the gNB ID, indicating that the target cell ID needs to be adjusted after a handover failure. The parameter value is:

[0056]

[0057] L represents the Lth round of gNB ID length handover neighboring cell attempt by the base station, and L takes the value of 1, 2, 3; n represents the nth attempt in the Lth round, and the value range of n is as follows:

[0058]

[0059] The constraint condition is:

[0060] InitialLength + AdjustLength ≤ 32.

[0061] Specifically, in step S3, the core network responds to the Handover Required message, finds the target base station according to the agreed calculation rule and the target base station ID to be switched, and when a matching target base station is found, the gNB ID length is the correct neighboring gNB ID length. When the core network cannot find a matching target base station due to an incorrect gNB ID length, the Handover Preparation Failure information element in the reply message is set to the corresponding failure message.

[0062] For example, the cause value of gNB ID NotMatch is filled in the cause information in the HandoverPreparationFailure information element, and the HandoverPreparationFailure information element is returned, indicating that the handover preparation fails due to the mismatch of the gNB ID length; similarly, for the gNB ID length that is correct and other reasons cause the target base station to be not found, a different gNB ID NotMatch cause value is filled in.

[0063] It should be noted that in order to automatically obtain the gNB ID length of the neighboring area during automatic switching of the neighboring area, the base station needs to interact with the core network to complete the modification of part of the information element in the base station side protocol, including agreeing on the target base station ID calculation rule and updating the target base station ID to be switched; it also includes adding the cause value of gNB ID NotMatch in the cause information in the HandoverPreparationFailure information element. The reason for adding the cause value in this message is that only the network side needs to be aware of the entire process, and the terminal side does not need to upgrade the protocol stack.

[0064] Specifically, the policy switching neighboring area attempt process in step S4 includes:

[0065] Step S41, using the adjusted gNB ID length, the corresponding target base station ID to be switched is calculated; based on the corresponding target base station ID to be switched, the handover preparation request is initiated to the core network again;

[0066] Step S42, when the termination condition is met, the policy switching neighboring area attempt is exited, and the correct gNB ID length of the neighboring area is obtained; otherwise, when the handover preparation request result replied by the AMF of the core network is that the handover preparation fails due to the mismatch of the gNB ID length, the current switching attempt fails.

[0067] After the current switching attempt fails, the ANR enhanced policy module adjusts the initial gNB ID length, including dividing the gNB ID length range into i length values with a step of 1, taking each length value as the adjusted gNB ID length, and sequentially performing the policy switching neighboring area attempt.

[0068] In order to improve the efficiency of obtaining the gNB ID length of the neighboring area, adjusting the initial gNB ID length also includes taking 4 as a step as a first round of policy switching neighboring area attempt; dividing the gNB ID length range into i4 length values, i4 corresponding to the number of switching in this round of attempt, taking each length value as the adjusted gNB ID length, and sequentially performing the policy switching neighboring area attempt;

[0069] When the i4th switching attempt fails, the gNB ID length is adjusted by 2 as a second round of strategy switching neighbor cell attempt; the gNB ID length range is divided into i2 length values, i2 corresponding to the number of switching attempts in this round, and the strategy switching neighbor cell attempt is performed in turn with each length value as the adjusted gNB ID length.

[0070] When the i2th switching attempt fails, the gNB ID length is adjusted by 1 as a third round of strategy switching neighbor cell attempt; the gNB ID length range is divided into i length values, i corresponding to the number of switching attempts in this round, and the strategy switching neighbor cell attempt is performed in turn with each length value as the adjusted gNB ID length.

[0071] For example, the initial gNB ID length N is set to 24, satisfying N >= 22 and N <= 32 (N is a value in the gNB ID length range); the process of the 5G base station acquiring the correct gNB ID length according to the above strategy includes:

[0072] When the first execution of steps S41 and S42 is N = 24, the gNB ID length is adjusted to N = N + m (m is the step size) when the switching attempt fails this time;

[0073] Take m = 4 as the first round of switching attempt, if N <= 32, repeat steps S41 and S42; if N > 32, start the second round of switching attempt.

[0074] It should be noted that in the first round of switching attempt, the first repetition of steps S41 and S42 takes N = 24 + 4 = 28, and at this time, since N <= 32, the next switching request is entered;

[0075] If the gNB ID length needs to be adjusted, take N = 28 + 4 = 32, and at this time, since N <= 32, the second repetition of steps S41 and S42 is entered;

[0076] If the gNB ID length needs to be adjusted, take N = 32 + 4 = 36, and at this time, since N > 32, the second round of switching attempt is started.

[0077] In the second round of switching attempt, take m = 2, if N <= 32, re-execute steps S41 and S42; if N > 32, start the third round of switching attempt.

[0078] It should be noted that in the second round of switching attempt, the first repetition of steps S41 and S42 takes N = 24 + 2 = 26, and at this time, since N <= 32, the next switching request is entered; if the gNB ID length needs to be adjusted, take N = 26 + 2 = 28; at this time, since N <= 32, the second switching preparation application is entered, until the third round of switching attempt needs to be started.

[0079] The third round of switching attempts, taking m = 1, if N <= 32, re-executes steps S41 and S42; if N > 32, exit the strategy switching neighbor area attempt.

[0080] Wherein, the termination condition is that the core network AMF replies to the switching preparation success or the gNB ID length matches when the reason value of gNB IDNotMatch in the HandoverPreparationFailure information element indicates that the correct gNB ID length is obtained. When the third round of switching attempts exits the strategy switching neighbor area attempt because N > 32, as an abnormal protection, the gNB ID length of the current cell is taken as the correct neighbor gNB ID length.

[0081] By filling the obtained correct neighbor gNB ID length into the neighbor list, the next neighbor switching execution process can directly use the gNB ID length for switching.

[0082] Specifically, after the core network sends the switching command (HandoverCommand) to the base station, the gNodeB sends the radio resource control reconfiguration (RRCReconfiguration) message to the UE, carries the target frequency point, PCI of switching and the CRNTI and dedicated preamble configured for the UE, and continues the subsequent switching process.

[0083] Compared with the prior art, the method for automatically obtaining the gNB ID length of the neighbor area of the 5G base station provided by the embodiment obtains the gNB ID of the neighbor area to be switched based on the gNB ID length in the neighbor switching preparation stage through the ANR enhancement strategy module, adjusts the gNB ID length to attempt the strategy switching neighbor area, determines the correct gNB ID length in the attempt process, and finally realizes the full automation of the neighbor information acquisition. At the same time, the acquisition of the gNB ID length of the neighbor area is completed based on the interaction between the 5G base station and the core network, without the participation of the user end, and the implementability is strong.

[0084] Embodiment 2

[0085] Another specific embodiment of the application discloses a system for automatically obtaining the gNB ID length of the neighbor area of the 5G base station, comprising:

[0086] The 5G base station configured with the ANR enhancement strategy module is used to issue a CGI measurement control message, automatically add a neighbor area according to a CGI measurement report periodically reported by a user equipment, and set an initial gNB ID length of each neighbor area by using the ANR enhancement strategy module; a target neighbor area to be switched is determined according to a physical cell identifier carried in the CGI measurement report, a target base station ID to be switched is obtained by combining the initial gNB ID length of the target neighbor area, and a handover preparation request is initiated to a core network; and the initial gNB ID length is adjusted by using the ANR enhancement strategy module according to a corresponding failure message in a reply, a strategy handover neighbor area is attempted, and a correct neighbor area gNB ID length is obtained.

[0087] A user equipment is used to measure according to a CGI measurement control message issued by a 5G base station and periodically report a CGI measurement report.

[0088] A core network is used to interact with a 5G base station during a handover neighbor area preparation process, including searching for a target base station according to a target base station ID to be switched in response to the handover preparation request; and when a target base station cannot be matched due to an incorrect gNB ID length, a corresponding failure message is included in a handover preparation failure information element in a reply message.

[0089] By modifying part of protocols of a 5G base station and a core network, a gNB ID mismatch reason value is added in a failure cause information of a handover preparation failure information element, which is used to indicate a matching result of a gNB ID length in a handover preparation failure cause.

[0090] The system can be implemented according to the method in any one of the schemes in Embodiment 1. The related parts are mutually referenced, and the present embodiment is not repeatedly described.

[0091] Compared with the prior art, the system for a 5G base station to automatically obtain a neighbor area gNB ID length provided in the present embodiment completes the acquisition of a correct neighbor area gNB ID length through specific interaction between a 5G base station configured with an ANR enhancement strategy module and a target handover preparation process of a core network, and performs a neighbor area handover based on the length, thereby solving the problem of handover failure caused by the failure to obtain a gNB ID length of a neighbor area.

[0092] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments can be completed by a computer program instructing related hardware, and the program can be stored in a computer readable storage medium, such as a magnetic disk, an optical disk, a read-only memory or a random access memory.

[0093] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for a 5G base station to automatically obtain the length of a neighboring gNB ID, characterized in that: The steps include: The 5G base station automatically adds neighboring cells based on the CGI measurement reports regularly reported by the user equipment, and uses the automatic neighbor addition ANR enhancement strategy module to set the initial gNB ID length of each neighboring cell. Determine the target neighboring cell to be handed over based on the physical cell identifier carried in the CGI measurement report, obtain the target base station ID to be handed over based on the initial gNB ID length of the target neighboring cell, and initiate a handover preparation request to the core network; The core network responds to the handover preparation request and searches for a target base station based on the ID of the target base station to be handed over. If the target base station cannot be matched due to an incorrect gNB ID length, the handover preparation failure information element in the reply message includes a corresponding failure message. If a matching target base station is found, the gNB ID length is the correct neighboring gNB ID length. The 5G base station uses the ANR enhanced policy module to adjust the gNB ID length of the neighboring cell based on the corresponding failure message in the reply message, and performs a policy handover neighboring cell attempt to obtain the correct neighboring gNB ID length. The ID of the target base station to be handed over is calculated based on the following formula using cellIdentity and gNB ID length: Target cell ID = gNBID*2 36-(InitialLength+AdjustLength) +cellID, Where InitialLength is the initial length of the gNBID; AdjustLength is the gNBID length adjustment parameter, indicating that the target cell ID needs to be adjusted after a handover failure; L indicates that the 5G base station performs the Lth round of gNBIDlength handover neighboring cell attempts; and n indicates the nth handover attempt in the Lth round.

2. The method for automatically obtaining the length of the neighboring gNB ID by a 5G base station according to claim 1, characterized in that: The corresponding failure message includes adding a gNB ID mismatch cause value to the failure cause information of the handover preparation failure information element, which is used to indicate the matching result of the gNB ID length under the handover preparation failure cause.

3. The method for automatically obtaining the length of the neighboring gNB ID by a 5G base station according to claim 1, characterized in that: The strategy switching neighboring cell attempt includes: Using the adjusted gNB ID length, calculate the corresponding target base station ID to be handed over. Based on the corresponding target base station ID to be switched, a handover preparation request is again initiated to the core network. When a matching target base station is found, the policy handover neighboring cell attempt is exited and the correct neighboring cell gNB ID length is obtained. Otherwise, the handover attempt fails.

4. The method for a 5G base station to automatically obtain the length of a neighboring gNB ID according to claim 3, characterized in that: When the gNB ID length of the neighboring cell is adjusted and all attempts to switch the neighboring cell to the above strategy fail, as an exception protection, the gNB ID length of the current base station cell is set to the correct neighboring cell gNB ID length.

5. The method for automatically obtaining the length of the neighboring gNB ID by a 5G base station according to claim 4, characterized in that: Adjusting the gNB ID length of the neighboring cell includes: The gNB ID length range is divided into i length values ​​with a step size of 1. Each length value is used as the adjusted gNB ID length, and the strategy switching neighbor cell attempt is performed in sequence.

6. The method for a 5G base station to automatically obtain the length of a neighboring gNB ID according to claim 4, characterized in that: Adjusting the neighboring cell gNB ID length further includes: In the first round of strategic handover neighbor cell attempts, the gNB ID length range is divided into i4 length values, with i4 corresponding to the number of handover attempts in this round. Each length value is used as the adjusted gNB ID length, and the strategic handover neighbor cell attempts are performed sequentially. If the i4th neighbor cell handover attempt fails, a second round of strategic neighbor cell handover attempts is performed with a step size of 2. The gNB ID length range is divided into i2 length values, and each length value is used as the adjusted gNB ID length. The strategic neighbor cell handover attempts are performed sequentially. If i2 neighbor cell handover attempts fail, a third round of strategic neighbor cell handover attempts is performed with a step size of 1. The gNB ID length range is divided into i length values, and each length value is used as the adjusted gNB ID length. The aforementioned strategic neighbor cell handover attempts are performed sequentially.

7. A method for a 5G base station to automatically obtain a neighboring gNB ID length according to any one of claims 1 to 6, characterized in that: The neighbor gNB ID length is added to the neighbor list, and the correct neighbor gNB ID length is updated to the neighbor list and directly used in the next neighbor handover execution process.

8. A system for a 5G base station to automatically obtain the length of a neighboring gNB ID, characterized in that: include: Configure the 5G base station with the automatic addition of the neighboring cell ANR enhancement strategy module, which is used to set the initial gNB ID length of each neighboring cell separately using the ANR enhancement strategy module; The target gNB ID to be handed over is obtained based on the initial gNB ID length of the target neighboring cell and a handover preparation request is initiated to the core network. Based on the corresponding failure message in the reply message, the ANR enhanced policy module is used to adjust the initial gNB ID length and perform a policy handover neighboring cell attempt to obtain the correct neighboring gNB ID length. The user equipment is configured to perform measurements based on the CGI measurement control message sent by the 5G base station and to periodically report CGI measurement reports; The core network is configured to respond to the handover preparation request and search for a target base station based on the ID of the target base station to be handed over; wherein, when the target base station cannot be matched due to an incorrect gNB ID length, the handover preparation failure information element in the reply message includes a corresponding failure message; The ID of the target base station to be handed over is calculated based on the following formula using cellIdentity and gNB ID length: Target cell ID = gNBID*2 36-(InitialLength+AdjustLength) +cellID, Where InitialLength is the initial length of the gNBID; AdjustLength is the gNBID length adjustment parameter, indicating that the target cell ID needs to be adjusted after a handover failure; L indicates that the 5G base station performs the Lth round of gNBIDlength handover neighboring cell attempts; and n indicates the nth handover attempt in the Lth round.

9. The system for automatically obtaining the length of neighboring gNB ID by a 5G base station according to claim 8, characterized in that: By modifying the cell protocol of the 5G base station and core network, including adding a gNBID mismatch cause value to the failure cause information of the handover preparation failure cell, it is used to indicate the gNB ID length matching result under the handover preparation failure cause.

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