A method for fast return to 5G network

Abstract

The present application relates to the field of communication technology, and more particularly to a kind of fast return 5G network method, including terminal sends the best LTE base station ID to NR base station, NR base station is based on the best LTE base station ID assembly handover request message, 5G core network sends handover request message to LTE core network, LTE core network sends handover request message to the best LTE base station, the best LTE base station saves handover request message, return to 5G network, the present application so LTE base station does not need to trigger the release of inter-system B1 event measurement, directly use the ID value of previously saved NR base station, to do the switching of LTE network to 5G network, if switching fails, initiate inter-system measurement or redirection again, by this way to reach optimization process, reduce signaling exchange, fast return 5G network, thereby solve the problem of long time spent in the prior art returning network method.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a method for fast return to a 5G network. Background Technology

[0002] The existing method for returning to the 5G network is as follows: After the user completes the VoLTE voice service and deletes the voice service bearer, it is determined whether the UE supports NR and NGC. If it supports NR and NGC, the eNodeB issues an inter-system B1 event measurement. The UE receives the measurement configuration from the eNodeB and performs inter-system NR measurement. After receiving the NR target cell or target frequency information, the UE completes the handover or redirection to the NR cell. If both handover and redirection are enabled, the handover is prioritized.

[0003] Using the above method, the process suffers from excessive signaling exchange and excessive time consumption. Summary of the Invention

[0004] The purpose of this invention is to provide a fast fastreturn method for returning to the 5G network, aiming to solve the problem that existing network return methods take a long time.

[0005] To achieve the above objectives, this invention provides a method for fast return to a 5G network, comprising the following steps: The terminal sends the best LTE base station ID to the NR base station; The NR base station assembles a handover request message based on the optimal LTE base station ID; The 5G core network sends the handover request message to the LTE core network; The LTE core network sends the handover request message to the best LTE base station; The optimal LTE base station saves the handover request message and returns it to the 5G network.

[0006] The terminal sends the best LTE base station ID to the NR base station, including: Trigger a cross-system B1 measurement event and send the measurement event to the terminal; The terminal receives the measurement event and measures the LTE base stations in the current coverage area to obtain the best LTE base station ID; The terminal sends the optimal LTE base station ID to the NR base station.

[0007] The NR base station assembles a handover request message based on the optimal LTE base station ID, including: The NR base station adds the optimal LTE base station ID to the target base station parameters to obtain the first parameter; The second parameter is obtained by adding the source base station ID to the first parameter; Assemble the handover request message based on the second parameter.

[0008] The 5G core network sends the handover request message to the LTE core network, including: The 5G core network evaluates the handover request message and obtains the evaluation result. Based on the judgment result, the 5G core network sends the handover request message to the LTE core network through the N26 interface of the 5G core network and the LTE core network.

[0009] The LTE core network sends the handover request message to the best LTE base station, including: The LTE core network reads the handover request message and determines the best LTE base station; The LTE core network will send the handover request message to the optimal LTE base station.

[0010] The optimal LTE base station saves the handover request message and returns it to the 5G network, including: The LTE base station reads the source base station ID parameter from the handover request message; The LTE base station saves the source base station ID parameter and returns it to the 5G network.

[0011] The LTE base station reads the source base station ID parameter from the handover request message, including: If the handover request message carries the IMS voice EPS fallback from 5G parameter, then the user's location has not exceeded the coverage area of ​​the NR base station; The NR base station returns to the 5G network based on the NR base station ID.

[0012] The first parameter includes the NR base station ID, the optimal LTE base station ID, and IMS voice EPSfallback from 5G.

[0013] The best LTE base station ID is the LTE base station ID with the best signal.

[0014] The source base station ID parameter is the ID address of the 5G base station.

[0015] This invention provides a fast fastreturn method for returning to the 5G network. The terminal sends the optimal LTE base station ID to the NR base station. The NR base station assembles a handover request message based on the optimal LTE base station ID. The 5G core network sends the handover request message to the LTE core network, which in turn sends it to the optimal LTE base station. The optimal LTE base station saves the handover request message and returns to the 5G network. Therefore, this invention eliminates the need for the LTE base station to trigger inter-system B1 event measurement. Instead, it directly uses the previously saved NR base station ID value to perform the handover from the LTE network to the 5G network. If the handover fails, it initiates inter-system measurement or redirection. This method optimizes the process, reduces signaling exchange, and enables a fast return to the 5G network, thus solving the problem of long turnaround times in existing network return methods. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart of a method for fast return to a 5G network provided by the present invention.

[0018] Figure 2 This is a flowchart of the terminal sending the best LTE base station ID to the NR base station.

[0019] Figure 3 This is a flowchart of a method for fast return to a 5G network provided by the present invention. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] Please see Figures 1 to 3 This invention provides a method for fast return to a 5G network, comprising the following steps: The S1 terminal sends the best LTE base station ID to the NR base station; S11 triggers a measurement event in the inter-system B1 and sends the measurement event to the terminal; Specifically, when the NR base station is in the handover preparation phase, it triggers the inter-system B1 measurement event and sends the measurement event to the terminal.

[0022] S12 The terminal receives the measurement event and measures the LTE base stations in the current coverage area to obtain the best LTE base station ID; The best LTE base station ID is the LTE base station ID with the best signal.

[0023] Specifically, after receiving a cross-system measurement event, the terminal measures the LTE base station with the best signal within its current coverage area.

[0024] S13 The terminal sends the optimal LTE base station ID to the NR base station.

[0025] Specifically, the terminal reports the ID of the LTE base station with the best signal to the NR base station.

[0026] S2 The NR base station assembles a handover request message based on the optimal LTE base station ID; The NR base station in S21 adds the optimal LTE base station ID to the target base station parameters to obtain the first parameter; Specifically, the reported LTE base station ID is added to the Target Cell ID parameter of the message to obtain the first parameter.

[0027] S22 adds the source base station ID based on the first parameter to obtain the second parameter; Specifically, it adds its own NR base station ID to the source Node ID parameter and sets the parameter IMS voice EPS fallback from 5G to true to indicate that this handover request is a voice service falling back from the 5G network to the LTE network.

[0028] S23 assembles a handover request message based on the second parameter.

[0029] Specifically, the handover request message is assembled based on the second parameter.

[0030] The S35G core network sends the handover request message to the LTE core network; The S315G core network judges the handover request message and obtains the judgment result; Specifically, the 5G core network determines whether the handover request message is sent to the LTE base station based on the received target base station ID.

[0031] Based on the judgment result, the 5G core network in S32 sends the handover request message to the LTE core network through the N26 interface of the 5G core network and the LTE core network.

[0032] Specifically, messages are sent to the LTE core network through the N26 interface of the 5G core network and the LTE core network.

[0033] S4 The LTE core network sends the handover request message to the best LTE base station; The LTE core network described in S41 reads the handover request message and determines the best LTE base station; Specifically, the LTE core network ultimately locates the LTE base station through the target base station ID.

[0034] The LTE core network described in S42 will send the handover request message to the optimal LTE base station.

[0035] Specifically, the LTE core network ultimately sends the handover request message to the LTE base station with the best initial signal strength.

[0036] The optimal LTE base station in S5 saves the handover request message and returns it to the 5G network.

[0037] S51 The LTE base station reads the source base station ID parameter in the handover request message; S511 If the handover request message carries the IMS voice EPS fallback from 5G parameter, then the user's location has not exceeded the coverage area of ​​the NR base station; Specifically, if the handover request message carries the IMS voice EPS fallback from 5G parameter, the LTE base station knows that the handover request message is a voice connection handover message from the 5G network. When the voice service ends, the LTE base station knows that during the duration of the voice service, the terminal did not undergo a base station handover process, and therefore the user's location did not exceed the coverage area of ​​the NR base station.

[0038] The NR base station in S512 returns to the 5G network based on the NR base station ID.

[0039] Specifically, the LTE base station does not need to trigger the inter-system B1 event measurement. Instead, it directly uses the previously saved NR base station ID value to perform the LTE-to-5G network handover request process and quickly returns to the 5G network. This achieves the goal of optimizing the signaling process.

[0040] The LTE base station described in S52 saves the source base station ID parameter and returns it to the 5G network.

[0041] Specifically, the LTE base station saves the source base station ID parameter and returns it to the 5G network.

[0042] If the handover request message does not carry the IMS voice EPS fallback from 5G parameter, the LTE base station knows that this handover request message is a normal handover request message from another LTE base station. Alternatively, if the terminal initially experienced a voice fallback from the 5G network to the LTE network, but then another handover occurred between LTE base stations after the terminal switched to the LTE network, the IMS voice EPS fallback from 5G parameter will not be carried in the handover request message, thus preventing the triggering of the optimization process in step 1. The subsequent handover process from the LTE network back to the 5G network is similar to the process from the 5G network to the LTE network.

[0043] The above-disclosed method is merely a preferred embodiment of the fast return method for 5G network according to the present invention. It should not be construed as limiting the scope of the present invention. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A method for fast return to a 5G network, characterized in that, Includes the following steps: The terminal sends the best LTE base station ID to the NR base station, including: Trigger a cross-system B1 measurement event and send the measurement event to the terminal; The terminal receives the measurement event and measures the LTE base stations in the current coverage area to obtain the best LTE base station ID; The terminal sends the optimal LTE base station ID to the NR base station; The NR base station assembles a handover request message based on the optimal LTE base station ID, including: The NR base station adds the optimal LTE base station ID to the target base station parameters to obtain the first parameter; The second parameter is obtained by adding the source base station ID to the first parameter; Assemble the handover request message based on the second parameter; The 5G core network sends the handover request message to the LTE core network, including: The 5G core network evaluates the handover request message and obtains the evaluation result. Based on the judgment result, the 5G core network sends the handover request message to the LTE core network through the N26 interface of the 5G core network and the LTE core network; The LTE core network sends the handover request message to the best LTE base station, including: The LTE core network reads the handover request message and determines the best LTE base station; The LTE core network will send the handover request message to the best LTE base station; The optimal LTE base station saves the handover request message and returns it to the 5G network, including: The LTE base station reads the source base station ID parameter from the handover request message, including: If the handover request message carries the IMS voice EPS fallback from 5G parameter, then the user's location has not exceeded the coverage area of ​​the NR base station; The NR base station returns the 5G network information based on the NR base station ID. The LTE base station saves the source base station ID parameter and returns it to the 5G network.

2. The method for fast return to a 5G network as described in claim 1, characterized in that, The first parameter includes the NR base station ID, the optimal LTE base station ID, and IMS voice EPS fallback from 5G.

3. The method for fast return to a 5G network as described in claim 2, characterized in that, The best LTE base station ID is the LTE base station ID with the best signal.

4. The method for fast return to a 5G network as described in claim 3, characterized in that, The source base station ID parameter is the ID address of the 5G base station.

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