5G ad hoc network communication improvement method and system

Abstract

The invention provides a 5G ad hoc network communication improvement method and system. The method comprises the following steps: S1, setting ad hoc network system parameters; the ad hoc network system comprises a BMESH module and an RMESH module; the BMESH module is used for bearing roaming information of different communication nodes, establishing a mapping relation table and detecting whether adjacent nodes are abnormal or not; the RMESH module can enable different terminals to perform network intercommunication; and S2, performing cross-base-station switching, cross-node reselection and destroy resistance by using a BMESH module to complete the improvement of the ad hoc network. The 5G + Mesh dynamic ad hoc network technology is adopted, the cross-base-station switching, reselection and destroy-resistant method of the ad hoc network is innovatively provided, and the reliability and robustness of 5G ad hoc network communication are enhanced through a centerless, multi-hop and temporary networking mechanism among 5G, Mesh and routing equipment.

Description

Technical Field

[0001] The present invention relates to the field of 5G communications, and in particular, to an improved method and system for 5G self-organizing network communications. Background Art

[0002] With the widespread application of 5G technology, new requirements have been put forward for wireless networks in mobile application scenarios. For example, under the premise of meeting the diversity of services, the characteristics of wireless networks such as mobile deployment, self-organization, self-healing, and damage resistance should be strengthened to ensure that communications are not interrupted when nodes are dynamically added, deleted, or damaged, and that long-distance coverage is provided under the condition of node mobility within a range of tens of kilometers.

[0003] During the switching process of communication nodes, standard 3GPP switching places a heavy load on bandwidth; while in anti-destruction fast access, it is generally necessary to undergo NR air interface detection and then re-search the network, but this process often takes a long time. Summary of the invention

[0004] In view of the defects in the prior art, the object of the present invention is to provide an improved method and system for 5G self-organizing network communication.

[0005] An improved method for 5G self-organizing network communication provided by the present invention includes:

[0006] Step S1: Setting the parameters of the ad hoc network system;

[0007] The ad hoc network system includes a BMESH module and a RMESH module;

[0008] The BMESH module includes carrying roaming information of different communication nodes, establishing a mapping relationship table, and detecting whether an abnormality occurs in adjacent nodes;

[0009] The RMESH module enables different terminals to communicate with each other over the network;

[0010] Step S2: Use the BMESH module to perform cross-base station switching, cross-node reselection and anti-destruction to complete the improvement of the self-organizing network.

[0011] Preferably, the self-organizing network system further includes a 5G RAN side device, a 5GC, a routing module and a terminal; and the step S2 includes:

[0012] Perform cross-base station switching, so that the BMESH module of the ad hoc network carries the roaming information of different communication nodes; when the communication node is switched, the roaming information of the previous communication node is loaded through the BMESH module to complete the cross-core network roaming switching process;

[0013] Perform cross-node reselection, establish a mapping relationship table, and send it from the previous communication node to the next communication node through the BMESH module to complete the node reselection process;

[0014] To perform anti-destruction access, among two adjacent nodes, the BMESH module of one of the nodes detects the BMESH module of another abnormal node, and then re-accesses other communication nodes to complete the network search and access.

[0015] Preferably, the core network roaming switching process includes:

[0016] After the terminal uploads the measurement report to the gNB, the gNB issues a handover command. After the handover is completed, the source core network releases the PDUSession, and the terminal initiates PDU Session re-establishment in the target core network. The terminal soft network control reports the mapping relationship between APPIP and CPE PI to the node soft network control. The target side node soft network control broadcasts the mapping relationship between APP IP and Mesh node.

[0017] Preferably, the node reselection process includes:

[0018] When the terminal migrates from the current node to another node, due to the different TAC, it actively initiates the re-registration process in the new cell; the 5GC of the current node rejects the process, and the rejection reason value is 9, 10, or 22, triggering the terminal to re-initiate re-registration of the new session type; the 5GC of the other node re-assigns a new IP to the terminal;

[0019] The terminal reports the binding relationship between APP IP and CPE IP to its node soft network control through the target base station. The target node soft network control refreshes the mapping relationship and synchronizes it to the BMESH module of this node, and broadcasts it to all node soft network controls in the network; after the previous node detects that the terminal is offline, it deletes the UE-related routes.

[0020] Preferably, the process of survivable access includes:

[0021] After the gNB, 5GC and BMESH modules of the current node are destroyed at the same time, the BMESH module of the neighboring node detects the abnormality and exits from the MESH network, notifying its node soft network control; the node soft network control of the neighboring node notifies its terminal of the abnormal information, and the terminal broadcasts in the RMESH subnet through the RMESH module; the terminal soft network control of the faulty node receives the broadcast information, determines that the abnormal node is the current resident node through the physical cell identifier of the current access cell, and notifies its CPE to search the network again.

[0022] An improved system for 5G self-organizing network communication provided by the present invention includes:

[0023] Module M1: Set the parameters of the ad hoc network system;

[0024] The ad hoc network system includes a BMESH module and a RMESH module;

[0025] The BMESH module includes carrying roaming information of different communication nodes, establishing a mapping relationship table, and detecting whether an abnormality occurs in adjacent nodes;

[0026] The RMESH module enables different terminals to communicate with each other over the network;

[0027] Module M2: Use the BMESH module to perform cross-base station switching, cross-node reselection and anti-destruction to complete the improvement of the self-organizing network.

[0028] Preferably, the self-organizing network system further includes a 5G RAN side device, a 5GC, a routing module and a terminal; the module M2 includes:

[0029] Perform cross-base station switching, so that the BMESH module of the ad hoc network carries the roaming information of different communication nodes; when the communication node is switched, the roaming information of the previous communication node is loaded through the BMESH module to complete the cross-core network roaming switching process;

[0030] Perform cross-node reselection, establish a mapping relationship table, and send it from the previous communication node to the next communication node through the BMESH module to complete the node reselection process;

[0031] To perform anti-destruction access, among two adjacent nodes, the BMESH module of one of the nodes detects the BMESH module of another abnormal node, and then re-accesses other communication nodes to complete the network search and access.

[0032] Preferably, the core network roaming switching process includes:

[0033] After the terminal uploads the measurement report to the gNB, the gNB issues a handover command. After the handover is completed, the source core network releases the PDUSession, and the terminal initiates PDU Session re-establishment in the target core network. The terminal soft network control reports the mapping relationship between APPIP and CPE PI to the node soft network control. The target side node soft network control broadcasts the mapping relationship between APP IP and Mesh node.

[0034] Preferably, the node reselection process includes:

[0035] When the terminal migrates from the current node to another node, due to the different TAC, it actively initiates the re-registration process in the new cell; the 5GC of the current node rejects the process, and the rejection reason value is 9, 10, or 22, triggering the terminal to re-initiate re-registration of the new session type; the 5GC of the other node re-assigns a new IP to the terminal;

[0036] The terminal reports the binding relationship between APP IP and CPE IP to its node soft network control through the target base station. The target node soft network control refreshes the mapping relationship and synchronizes it to the BMESH module of this node, and broadcasts it to all node soft network controls in the network; after the previous node detects that the terminal is offline, it deletes the UE-related routes.

[0037] Preferably, the process of survivable access includes:

[0038] After the gNB, 5GC and BMESH modules of the current node are destroyed at the same time, the BMESH module of the neighboring node detects the abnormality and exits from the MESH network, notifying its node soft network control; the node soft network control of the neighboring node notifies its terminal of the abnormal information, and the terminal broadcasts in the RMESH subnet through the RMESH module; the terminal soft network control of the faulty node receives the broadcast information, determines that the abnormal node is the current resident node through the physical cell identifier of the current access cell, and notifies its CPE to search the network again.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The present invention adopts the technology of 5G+Mesh dynamic self-organizing network, and innovatively proposes the cross-base station switching, reselection and anti-destruction methods of self-organizing network. Through the centerless, multi-hop and temporary networking mechanism between 5G, Mesh and routing devices, the reliability and robustness of 5G self-organizing network communication are enhanced.

[0041] 2. In the switching process of the communication node of the present invention, the roaming information of the communication node is carried through the self-organizing network BMESH compared with the standard 3GPP switching. Therefore, the terminal can communicate with the communication node and load the roaming services of other communication nodes through BMESH. Since the data anchor point of the terminal is at the target UPF, the data packet is forwarded directly under the target UPF, so the BMesh bandwidth load is relatively small.

[0042] 3. In the process of cross-node reselection, the present invention utilizes the BMESH self-organizing network characteristics to establish a mapping relationship table and transmits between communication nodes through BMESH, which has good flexibility.

[0043] 4. In the process of anti-destruction and rapid access, the present invention quickly detects the BMESH abnormality of the node through the BMESH of the neighboring node of the current node, avoiding the time-consuming process of re-searching the network after NR air interface detection, shortening the terminal air interface detection time, and having the characteristics of anti-destruction and rapid switching.

[0044] Other beneficial effects of the present invention will be explained in the specific implementation manner through the introduction of specific technical features and technical solutions. Through the introduction of these technical features and technical solutions, those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0046] Figure 1 Schematic diagram of cross-base station switching without anchor point switching.

[0047] Figure 2 This is a schematic diagram of 3GPP inter-base station switching.

[0048] Figure 3 The present invention is a flow chart of the method.

[0049] Figure 4 A schematic diagram of cross-base station switching of anchor point switching according to the present invention.

[0050] Figure 5 It is a schematic diagram of the inter-base station switching process in the present invention.

[0051] Figure 6 It is a schematic diagram of network communication node reselection in the present invention.

[0052] Figure 7 It is a schematic diagram of the base station anti-destruction process in the present invention. DETAILED DESCRIPTION

[0053] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0054] Reference Figure 1 FIG. 4 shows a process of cross-base station switching without switching the anchor point.

[0055] The prerequisites are:

[0056] Both communication nodes 1 and 2 have opened accounts for terminal 1, and the roaming interface data between communication nodes 1 and 2 can be carried on the Bmesh network;

[0057] Terminal 1 initially accesses the network at communication node 1. SSC MODE1 type is used when the initial PDU is established. Communication node 1 and node 2 turn on ANR at the base station. The ANR technology is an automatic neighbor relationship function, and the cell neighbor relationship is correctly added.

[0058] Communication node 1 soft network control establishes topology routing establishment;

[0059] The BMESH modules of communication nodes 1 and 2 establish APP routing;

[0060] Terminal 1 has established a service data connection with other terminal devices through 5G.

[0061] Reference Figure 2 As shown, the process of switching between cells is as follows:

[0062] 1. gNodeB sends measurement control to UE through RRCReconfiguration, including measurement object (same frequency / different frequency), measurement report configuration, GAP measurement configuration, etc.

[0063] 2. The UE replies RRCReconfigurationComplete to the gNodeB. After receiving the new measurement control sent by the gNodeB, the UE replies RRCReconfigurationComplete.

[0064] 3. The UE performs measurement according to the received measurement control message; after the UE measures and determines that the event condition is met, it reports the measurement report to the gNodeB.

[0065] 4. After receiving the measurement report, gNodeB makes a handover strategy and target cell / frequency decision based on the measurement results;

[0066] 5. The source gNodeB initiates a handover request to the gNodeB where the selected target cell is located;

[0067] 6. After receiving the handover request, the target gNodeB performs admission control and allocates UE instances and transmission resources after allowing admission.

[0068] 7. The target gNodeB replies HANDOVER REQUEST ACKNOWLEDGE to the source gNodeB to allow the handover. If some PDU Sessions fail to be handed over, the message needs to carry a list of the failed PDU Sessions;

[0069] 8. The source gNodeB sends RRCReconfiguration to the UE, requesting the UE to perform a handover to the target cell;

[0070] 9. The source gNodeB sends the PDCP SN number to the target gNodeB via SN STATUS TRANSFER;

[0071] 10. The UE sends RRCReconfigurationComplete to the target gNodeB, and the UE air interface handover to the target cell is completed;

[0072] 11. The target gNodeB sends a PATH SWITCH REQUEST message to the AMF to notify the UE that the cell has been changed. The message contains the target cell identifier and the converted PDUSession list. After receiving the message, the core network updates the downlink GTPU data plane and changes the GTPU address on the RAN side to the target gNodeB;

[0073] 12. AMF responds to the target gNodeB with a PATH SWITCH REQUESTACKNOWLEDGE message. If AMF indicates in the Path Switch Request Ack message that the core network failed to establish the PDU Session, the gNodeB deletes the PDUSession that failed to be established.

[0074] 13. The target gNodeB sends a UE CONTEXT RELEASE message to the source gNodeB, and the source gNodeB releases the switched user;

[0075] 14 After switching to the target cell, gNodeB sends the measurement control information of the new cell to the UE.

[0076] (In 5G networks, AMF stands for Authentication Management Function. AMF is an important component of the 5G core network and is responsible for handling functions such as authentication, security policies and key management of user devices.)

[0077] The present invention adopts the technology of 5G+Mesh dynamic self-organizing network, and innovatively proposes the cross-base station switching, reselection and anti-destruction methods of self-organizing network. Through the centerless, multi-hop and temporary networking mechanism between 5G, Mesh and routing devices, the reliability and robustness of 5G self-organizing network communication are enhanced.

[0078] Reference Figure 3 As shown, an improved method for 5G self-organizing network communication includes:

[0079] Step S1: Setting the parameters of the ad hoc network system;

[0080] The ad hoc network system includes a BMESH module and a RMESH module;

[0081] The BMESH module includes carrying roaming information of different communication nodes, establishing a mapping relationship table, and detecting whether an abnormality occurs in adjacent nodes;

[0082] The RMESH module enables different terminals to communicate with each other over the network;

[0083] Step S2: Use the BMESH module to perform cross-base station switching, cross-node reselection and anti-destruction to complete the improvement of the self-organizing network.

[0084] Specifically, refer to Figure 4 and Figure 5 As shown in the figure, it is the process of switching across base stations:

[0085] The assumptions are:

[0086] The communication nodes have opened accounts for terminal 1, and the roaming interface data between communication nodes 1 and 2 can be carried on the Bmesh network;

[0087] Terminal 1 initially accesses the network at communication node 1. The SSC MODE2 type is used when the initial PDU is established. Communication nodes 1 and 2 enable the ANR function at the base station and correctly add the cell neighbor relationship.

[0088] Communication node 1 soft network control establishes topology routing establishment

[0089] The BMESH modules of communication nodes 1 and 2 establish APP routing.

[0090] Terminal 1 has established a service data connection with other terminal devices through 5G.

[0091] Reference Figure 5 As shown in the figure, after terminal 1 uploads the measurement report to gNB(s), gNB(s) issues a switching command; after the switching is completed, the source core network releases the PDU Session, and terminal 1 initiates PDU Session re-establishment in the target core network. The terminal soft network control reports the mapping relationship between APP IP and CPE PI to the node soft network control; the target side node soft network control broadcasts the mapping relationship between APP IP and Mesh node.

[0092] It can be seen that during the communication node switching process, compared with the standard 3GPP switching, the roaming information of communication node 1 and communication node 2 is carried through the self-organizing network BMESH, so the terminal and communication node 2 communicate with each other, and load the roaming service of communication node 1 through BMESH. Since the data anchor point of the terminal is in the target UPF, the data packet is forwarded directly under the target UPF, so the BMesh bandwidth load is relatively small.

[0093] Reference Figure 6As shown, the network communication node reselection process is:

[0094] Assumptions:

[0095] The tracking area codes (TACs) of all base stations in the communication system are different, and the base stations are configured to be inactive.

[0096] ·5GC supports account opening information synchronization, and has synchronized the terminal account opening information in all network nodes. 5GC supports local unified data management interface UDM (Unified Data Management) authentication and supports N6 interface through MESH bearer. N6 interface links 5G (NR) with external (public) networks or service platforms.

[0097] Terminal 1 initially accesses the network at communication node 1. Terminal 1 is currently in RRC idle state or the terminal is disconnected from the source node due to movement, triggering a reselection process. At this time, the signal coverage of node 2 is better than that of node 1, causing the terminal to reselect and access the network to node 2.

[0098] The communication node 1 soft network control topology routing is established and will be synchronized to the node 2 soft network control and BMESH in the network.

[0099] The re-election process is:

[0100] Terminal 1 migrates from node 1 to node 2. Due to the different TAC, the terminal actively initiates the re-registration process (type is location update) in the new cell. The 5GC of the current node will reject it with the rejection reason value of 9, 10, or 22, triggering the terminal to re-initiate the re-registration of the new session type. The 5GC of communication node 2 will re-assign a new IP2 to the terminal.

[0101] The terminal reports the binding relationship between APP IP and CPE IP to its node soft network control through the target base station. The target node soft network control refreshes the mapping relationship and synchronizes it to the local node BMESH, and broadcasts it to all node soft network controls in the network. After node 1 detects that the terminal is offline, it deletes the UE-related routes.

[0102] Reference Figure 7 As shown, the base station anti-destruction process is:

[0103] Assumptions:

[0104] Communication nodes 1 and 2 have opened an account for terminal 1, and 5GC supports local UDM authentication.

[0105] Terminal 1 initially joins the network at communication node 1.

[0106] Terminal 2 initially joins the network at communication node 2.

[0107] Assume that terminal 1 and terminal 2 can communicate with each other through the RMESH network

[0108] The process of rapid access to anti-destruction is as follows:

[0109] 1) Node 1 is destroyed (gNB&5GC&BMESH are destroyed at the same time).

[0110] 2) The BMESH of node 2, the neighbor of node 1, quickly detects the abnormality of node 1 BMESH and exits from the MESH network.

[0111] 3) Node 2BMESH notifies its node soft network control that communication node 1 is abnormal.

[0112] 4) Node 2 soft network control notifies its terminal that communication node 1 is abnormal.

[0113] 5) After receiving the communication node abnormality notification, terminal 2 broadcasts it in the RMESH subnet through the RMESH of terminal 2.

[0114] 6) The soft network control of terminal 1 receives the broadcast message and determines that the abnormal node is the currently resident node through the physical cell identifier (PCI) of the currently accessed cell.

[0115] 7) The soft network control of terminal 1 notifies its CPE to search the network again.

[0116] In the normal process, after a base station failure, the terminal needs to undergo NR air interface detection. Only after the NR air interface abnormality is found can it start to search for the network again. The detection process takes a long time. However, the above anti-destruction rapid network access process can shorten the terminal air interface detection time.

[0117] The present invention also provides an improved system for 5G self-organizing network communication, and the improved system for 5G self-organizing network communication can be realized by executing the process steps of the improved method for 5G self-organizing network communication, that is, those skilled in the art can understand the improved method for 5G self-organizing network communication as a preferred implementation of the improved system for 5G self-organizing network communication.

[0118] Specifically, an improved system for 5G self-organizing network communication includes:

[0119] Module M1: Set the parameters of the ad hoc network system;

[0120] The ad hoc network system includes a BMESH module and a RMESH module;

[0121] The BMESH module includes carrying roaming information of different communication nodes, establishing a mapping relationship table, and detecting whether an abnormality occurs in adjacent nodes;

[0122] The RMESH module enables different terminals to communicate with each other over the network;

[0123] Module M2: Use the BMESH module to perform cross-base station switching, cross-node reselection and anti-destruction to complete the improvement of the self-organizing network.

[0124] The self-organizing network system also includes 5G RAN side equipment, 5GC, a routing module and a terminal; the module M2 includes:

[0125] Perform cross-base station switching, so that the BMESH module of the ad hoc network carries the roaming information of different communication nodes; when the communication node is switched, the roaming information of the previous communication node is loaded through the BMESH module to complete the cross-core network roaming switching process;

[0126] Perform cross-node reselection, establish a mapping relationship table, and send it from the previous communication node to the next communication node through the BMESH module to complete the node reselection process;

[0127] To perform anti-destruction access, among two adjacent nodes, the BMESH module of one of the nodes detects the BMESH module of another abnormal node, and then re-accesses other communication nodes to complete the network search and access.

[0128] The core network roaming switching process includes:

[0129] After the terminal uploads the measurement report to the gNB, the gNB issues a handover command. After the handover is completed, the source core network releases the PDUSession, and the terminal initiates PDU Session re-establishment in the target core network. The terminal soft network control reports the mapping relationship between APPIP and CPE PI to the node soft network control. The target side node soft network control broadcasts the mapping relationship between APP IP and Mesh node.

[0130] The node reselection process includes:

[0131] When the terminal migrates from the current node to another node, due to the different TAC, it actively initiates the re-registration process in the new cell; the 5GC of the current node rejects the process, and the rejection reason value is 9, 10, or 22, triggering the terminal to re-initiate re-registration of the new session type; the 5GC of the other node re-assigns a new IP to the terminal;

[0132] The terminal reports the binding relationship between APP IP and CPE IP to its node soft network control through the target base station. The target node soft network control refreshes the mapping relationship and synchronizes it to the BMESH module of this node, and broadcasts it to all node soft network controls in the network; after the previous node detects that the terminal is offline, it deletes the UE-related routes.

[0133] The process of the invulnerable access includes:

[0134] After the gNB, 5GC and BMESH modules of the current node are destroyed at the same time, the BMESH module of the neighboring node detects the abnormality and exits from the MESH network, notifying its node soft network control; the node soft network control of the neighboring node notifies its terminal of the abnormal information, and the terminal broadcasts in the RMESH subnet through the RMESH module; the terminal soft network control of the faulty node receives the broadcast information, determines that the abnormal node is the current resident node through the physical cell identifier of the current access cell, and notifies its CPE to search the network again.

[0135] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0136] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0137] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An improved method for 5G ad hoc network communication, characterized in that: include: Step S1: Setting the parameters of the ad hoc network system; The ad hoc network system includes a BMESH module and a RMESH module; The BMESH module includes carrying roaming information of different communication nodes, establishing a mapping relationship table, and detecting whether an abnormality occurs in adjacent nodes; The RMESH module enables different terminals to communicate with each other over the network; Step S2: Use the BMESH module to perform cross-base station switching, cross-node reselection and anti-destruction to complete the improvement of the self-organizing network.

2. The improved method for 5G ad hoc network communication according to claim 1, characterized in that: The self-organizing network system also includes a 5G RAN side device, a 5GC, a routing module and a terminal; the step S2 includes: Perform cross-base station switching, so that the BMESH module of the ad hoc network carries the roaming information of different communication nodes; when the communication node is switched, the roaming information of the previous communication node is loaded through the BMESH module to complete the cross-core network roaming switching process; Perform cross-node reselection, establish a mapping relationship table, and send it from the previous communication node to the next communication node through the BMESH module to complete the node reselection process; To perform anti-destruction access, among two adjacent nodes, the BMESH module of one of the nodes detects the BMESH module of another abnormal node, and then re-accesses other communication nodes to complete the network search and access.

3. The improved method for 5G ad hoc network communication according to claim 2, characterized in that: The core network roaming switching process includes: After the terminal uploads the measurement report to the gNB, the gNB issues a handover command. After the handover is completed, the source core network releases the PDUSession, and the terminal initiates PDU Session re-establishment in the target core network. The terminal soft network control reports the mapping relationship between APPIP and CPE PI to the node soft network control. The target side node soft network control broadcasts the mapping relationship between APP IP and Mesh node.

4. The improved method for 5G ad hoc network communication according to claim 2, characterized in that: The node reselection process includes: When the terminal migrates from the current node to another node, due to the different TAC, it actively initiates the re-registration process in the new cell; the 5GC of the current node rejects the process, and the rejection reason value is 9, 10, or 22, triggering the terminal to re-initiate re-registration of the new session type; the 5GC of the other node re-assigns a new IP to the terminal; The terminal reports the binding relationship between APP IP and CPE IP to its node soft network control through the destination base station; the target node soft network control refreshes the mapping relationship and synchronizes it to the BMESH module of this node, and broadcasts it to all node soft network controls in the network; after the previous node detects that the terminal is offline, it deletes the UE-related routes.

5. The improved method for 5G ad hoc network communication according to claim 2, characterized in that: The process of the invulnerable access includes: After the gNB, 5GC and BMESH modules of the current node are destroyed at the same time, the BMESH module of the neighboring node detects the abnormality and exits from the MESH network, notifying its node soft network control; the node soft network control of the neighboring node notifies its terminal of the abnormal information, and the terminal broadcasts in the RMESH subnet through the RMESH module; the terminal soft network control of the faulty node receives the broadcast information, determines that the abnormal node is the current resident node through the physical cell identifier of the current access cell, and notifies its CPE to search the network again.

6. An improved system for 5G ad hoc network communication, characterized in that: include: Module M1: Set the parameters of the ad hoc network system; The ad hoc network system includes a BMESH module and a RMESH module; The BMESH module includes carrying roaming information of different communication nodes, establishing a mapping relationship table, and detecting whether an abnormality occurs in adjacent nodes; The RMESH module enables different terminals to communicate with each other over the network; Module M2: Use the BMESH module to perform cross-base station switching, cross-node reselection and anti-destruction to complete the improvement of the self-organizing network.

7. The improved system for 5G ad hoc network communication according to claim 6, characterized in that: The self-organizing network system also includes 5G RAN side equipment, 5GC, a routing module and a terminal; the module M2 includes: Perform cross-base station switching, so that the BMESH module of the ad hoc network carries the roaming information of different communication nodes; when the communication node is switched, the roaming information of the previous communication node is loaded through the BMESH module to complete the cross-core network roaming switching process; Perform cross-node reselection, establish a mapping relationship table, and send it from the previous communication node to the next communication node through the BMESH module to complete the node reselection process; To perform anti-destruction access, among two adjacent nodes, the BMESH module of one of the nodes detects the BMESH module of another abnormal node, and then re-accesses other communication nodes to complete the network search and access.

8. The improved system for 5G ad hoc network communication according to claim 7, characterized in that: The core network roaming switching process includes: After the terminal uploads the measurement report to the gNB, the gNB issues a handover command. After the handover is completed, the source core network releases the PDUSession, and the terminal initiates PDU Session re-establishment in the target core network. The terminal soft network control reports the mapping relationship between APPIP and CPE PI to the node soft network control. The target side node soft network control broadcasts the mapping relationship between APP IP and Mesh node.

9. The improved system for 5G ad hoc network communication according to claim 7, characterized in that: The node reselection process includes: When the terminal migrates from the current node to another node, due to the different TAC, it actively initiates the re-registration process in the new cell; the 5GC of the current node rejects the process, and the rejection reason value is 9, 10, or 22, triggering the terminal to re-initiate re-registration of the new session type; the 5GC of the other node re-assigns a new IP to the terminal; The terminal reports the binding relationship between APP IP and CPE IP to its node soft network control through the destination base station; the target node soft network control refreshes the mapping relationship and synchronizes it to the BMESH module of this node, and broadcasts it to all node soft network controls in the network; after the previous node detects that the terminal is offline, it deletes the UE-related routes.

10. The improved system for 5G ad hoc network communication according to claim 7, characterized in that: The process of the invulnerable access includes: After the gNB, 5GC and BMESH modules of the current node are destroyed at the same time, the BMESH module of the neighboring node detects the abnormality and exits from the MESH network, notifying its node soft network control; the node soft network control of the neighboring node notifies its terminal of the abnormal information, and the terminal broadcasts in the RMESH subnet through the RMESH module; the terminal soft network control of the faulty node receives the broadcast information, determines that the abnormal node is the current resident node through the physical cell identifier of the current access cell, and notifies its CPE to search the network again.

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