CN1925441A - Communication switching method - Google Patents

Abstract

The communication connection method disclosed in the present invention can perform two different operations when the communication interface between the source base station and the destination base station of the user terminal after switching from the source base station to the destination base station is congested. The wireless network gateway accessed by the terminal for communication establishes transmission links for the user terminal between the wireless network gateway and the source base station and between the wireless network gateway and the destination base station, so as to support the user terminal through the destination base station, wireless network gateway, source base station and Core network communication; the other is: move up the wireless interface protocol stack instance for the user terminal established by the source base station to the wireless network gateway that the source base station accesses for the user terminal; the wireless network gateway controls the establishment of the destination base station and the wireless network The transmission link between the gateways for the user terminal supports the communication between the user terminal and the core network through the destination base station and the wireless network gateway. The invention reduces the migration frequency and saves the transmission resources of the access network.

Description

A communication connection method

technical field

The invention relates to wireless access network technology in the communication field, and in particular to a communication connection method.

Background technique

The currently widely used wireless network is generally composed of a radio access network and a core network. Among them, the radio access network is usually composed of one or several radio network subsystems (RNS Radio Network Subsystem), and the RNS includes a radio network controller (RNC ), one or several base stations Node B. A radio access network system in a wireless network is shown in FIG. 1 , and FIG. 1 is a diagram of a radio access network system in a wireless network in the prior art.

Wherein, a wireless interface protocol stack is established in the RNC, that is, a wireless interface protocol stack such as PDCP/BMC/RLC/MAC. This enables the RNC to complete functions such as system broadcast, paging, radio resource control and management, and radio access network application protocol (RANAP)/radio network subsystem application protocol (RNSAP) message forwarding; Interface protocol stack, that is, wireless interface protocol stacks such as PDCP/BMC/RLC/MAC. Therefore, Node B can only complete functions such as wireless signal spread spectrum, modulation, coding, baseband signal and radio frequency signal interchange.

The RNC 101 is connected to the CN 100 through the Iu interface, and the RNC 101 is connected to the Node B 102 and the Node B 103 through the Iub interface. In this wireless access network structure, a Node B is only connected to one RNC, and there is a control and management-based ownership relationship between different RNCs and different Node Bs, that is, Node B 102 and Node B 103 are only connected to each other. Connected with RNC 101 and managed by RNC 101.

With the development of wireless communication, people are evolving the wireless access network. The wireless access network obtained by one of the evolution methods being theoretically studied is shown in Figure 2. Figure 2 shows another wireless access network in the prior art. System diagram of radio access network in network. The radio access network system includes a radio network gateway (RNG) and Node B+. Among them, RNG 201 is the functional entity after the evolution of RNC 101 in Figure 1, and Node B+202 and Node B+203 are the functional entities after the evolution of Node B 102 and Node B 103 in Figure 1. The "+" in the above Node B+ means that the NodeB+ has completed the evolution.

After the evolution, RNG 201 no longer has wireless interface protocol stacks such as PDCP/BMC/RLC/MAC. RNG 201 can only complete functions such as system broadcast, paging, and RANAP/RNSAP message forwarding, and no longer controls wireless resources. and management operations; relatively speaking, the evolved NodeB+ has established wireless interface protocol stacks such as PDCP/BMC/RLC/MAC, which enables Node B+ to complete wireless signal spread spectrum, modulation, coding, baseband signals and radio frequency signals. In addition to switching, it can also complete functions such as wireless resource control and management.

In Fig. 2, RNG 201 and CN 200 are connected through Iu interface.

In addition, there is a many-to-many connection relationship between Node B+ and RNG in Figure 2, and there is no fixed management and connection relationship between Node B+ and RNG, that is: any Node B+ can be connected to any one or more RNG is connected. In Figure 2, Node B+202, Node B+203 and RNG 201 are connected through the Iur/Iu interface; there is usually an Iur interface between Node B+202 and Node B+203.

In practical applications, the UE soft handover situation shown in FIG. 3 usually occurs. In Fig. 3, UE304 is switched from Node B+302 as the source Node B+ to Node B+303 as the destination Node B+. Since Node B+302 is still the source NodeB+ with a wireless interface protocol stack for UE 304, the signal sent by UE 304 to Node B+303 will be sent to CN 300 via Node B+302 and RNG 301. If Node B+302 detects that the Iur interface between itself and Node B+303 is congested at this time, Node B+302 initiates a migration process to Node B+303 to migrate the configuration information supporting UE 304 communication to Node B In +303, UE 304 communicates with CN 300 through Node B+303 and RNG 301.

Similarly, the soft handover of the UE across RNGs shown in Figure 4 also often occurs. In Fig. 4, UE 405 is switched from Node B+403 as the source Node B+ to Node B+404 as the destination Node B+. Since Node B+403 is still the source NodeB+ with a wireless interface protocol stack for UE 405, the signal sent by UE 405 to Node B+404 will be sent to CN 400 via Node B+403 and RNG 401. If at this time Node B+403 detects that the Iur interface between itself and Node B+404 is congested, Node B+403 initiates a migration process to Node B+404 to migrate the configuration information supporting UE 405 communication to Node B In +404, UE 405 communicates with CN 400 through Node B+404, RNG 402, RNG 401.

Since there are usually a large number of UEs performing the soft handover shown in Figure 3 and Figure 4 during normal communication, if the source Node B+ of the UE detects that the Iur interface between itself and the destination Node B+ of the UE is congested, it initiates In the migration process to the destination Node B+, the entire communication network will always be in the state of a large number of service migrations. In addition, the migration process involves a large number of signaling interactions, which will eventually lead to a serious waste of limited transmission resources in the access network.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a communication connection method to reduce the frequency of migration between Node B+s and save access network transmission resources.

Another object of the present invention is to provide another communication connection method to reduce the frequency of migration between Node B+s and save access network transmission resources.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

The invention discloses a communication connection method. After the UE is switched from the source Node B+ to the destination Node B+, the method includes the following steps:

a. When the communication interface between the source Node B+ and the destination Node B+ is congested, the wireless interface protocol stack instance for the UE established by the source Node B+ is moved up to the RNG that the source Node B+ accesses for the UE;

b. The RNG controls the destination Node B+ to establish a transmission link between the RNG and the RNG for the UE, so as to support the UE to communicate with the CN through the destination Node B+, RNG.

In step a, the method for moving the wireless interface protocol stack instance up to the RNG is:

The source Node B+ sends a macro-diversity merge relocation request to the RNG, which includes the radio interface protocol stack configuration information for the UE;

After receiving the macro-diversity combination relocation request from the source Node B+, the RNG creates a new radio interface protocol stack instance for the UE according to the configuration information contained in the request.

After the wireless interface protocol stack instance is moved up to the RNG, the method further includes:

The RNG sends a macro-diversity and relocation response to the source Node B+, and the source Node B+ deletes the radio interface protocol stack instance established for the UE after receiving the macro-diversity and relocation response from the RNG.

In step b, the method for establishing a transmission link is:

The RNG sends a transmission link establishment request to the target Node B+; after receiving the transmission link establishment request from the RNG, the target Node B+ establishes a transmission link for the UE between the target Node B+ and the RNG.

In step a, after the wireless interface protocol stack instance is moved up to the RNG, the RNG further sends a macro-diversity and migration response to the source Node B+;

Then in step b, the RNG controls the establishment of the transmission link while the RNG sends a macro-diversity and migration response to the source Node B+.

In step b, the established transmission link is a transmission link based on an Iur interface, or a transmission link based on an Iu interface.

The present invention also discloses a communication connection method. After the UE is switched from the source Node B+ to the destination Node B+, the method includes:

When the communication interface between the source Node B+ and the destination Node B+ is congested, the source Node B+ controls the RNG connected for UE communication, and respectively establishes transmission links between the RNG and the source Node B+ and between the RNG and the destination Node B+ for UE to support UE to communicate with CN through destination Node B+, RNG, and source Node B+.

The method for the source Node B+ to control the RNG to establish the transmission link is:

The source Node B+ sends a transmission link establishment request to the RNG, and the RNG sends the request to the destination Node B+ after receiving the transmission link establishment request from the source Node B+; the destination Node B+ establishes a transmission link between itself and Establish a transmission link for the UE between the RNGs, and send a link establishment response containing the configuration information of the transmission link to the RNG;

The RNG sends the link establishment response from the destination Node B+ to the source Node B+, and the source NodeB+ establishes a transmission link between itself and the RNG according to the transmission link configuration information contained in the response.

After the source Node B+ has established the transmission link, the method further includes:

The source Node B+ releases the transmission link for the UE between itself and the destination Node B+.

The established transmission link between the source Node B+ and the RNG is a transmission link based on the Iur interface;

The established transmission link between the destination Node B+ and the RNG is a transmission link based on an Iur interface, or a transmission link based on an Iu interface.

Compared with the prior art, in the different communication connection methods provided by the present invention, when the communication interface between the source Node B+ and the destination Node B+ of the handover UE is congested, both the RNG and the source Node B+ and the RNG and the RNG can be established respectively. The UE-targeted transmission link between the target Node B+; the wireless interface protocol stack instance for the UE established by the source Node B+ can also be moved up to the RNG that the source Node B+ accesses for the UE, and the target Node B+ and the UE can be established. A transmission link between RNGs for UEs.

It can be seen that the different communication connection methods provided by the present invention can ensure that when the Iur interface between the source Node B+ and the destination Node B+ of the UE is congested, no migration will be performed, saving access network transmission resources, and the UE can also communicate with the CN Normal communication.

Description of drawings

FIG. 1 is a system diagram of a wireless access network in a wireless network in the prior art;

FIG. 2 is a system diagram of a wireless access network in another wireless network in the prior art;

FIG. 3 is a schematic diagram of the data trend after the UE completes soft handover under the same RNG in the prior art;

FIG. 4 is a schematic diagram of the data trend after the UE completes cross-RNG soft handover in the prior art;

FIG. 5 is a schematic diagram of communication connection under the same RNG in a preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of a communication connection across RNGs in a preferred embodiment of the present invention;

FIG. 7 is a schematic diagram of communication connection under the same RNG in another preferred embodiment of the present invention;

FIG. 8 is a schematic diagram of communication connection across RNGs in another preferred embodiment of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

According to the different communication connection methods provided by the present invention, when the communication interface between the source Node B+ and the destination Node B+ of the UE that has completed the handover is congested, the UE-specific communication between the RNG and the source Node B+ and the RNG and the destination Node B+ can be respectively established. transmission link; or move up the UE-specific wireless interface protocol stack instance established by the source Node B+ to the RNG that the source Node B+ accesses for the UE, and establish a UE-specific transmission link between the destination Node B+ and the RNG road.

Referring to FIG. 5 , FIG. 5 is a schematic diagram of communication connection under the same RNG in a preferred embodiment of the present invention. In Figure 5, UE 504 is switched from Node B+502 as the source Node B+ to Node B+503 as the destination Node B+, and the signal sent by UE 504 to Node B+503 will be sent to CN 500 via NodeB+502 and RNG 501 . When Node B+502 detects that the Iur interface between itself and Node B+503 is congested, Node B+502 no longer initiates relocation, but initiates the transmission link reconstruction process to establish a connection between RNG 501 and Node B+502 and Transmission link between RNG 501 and Node B+503. The specific operation is:

Node B+502 sends a transmission link establishment request to RNG 501, and the request includes the identity of Node B+503 and the identity of UE 504. After receiving the transmission link establishment request from Node B+502, RNG 501 sends the request to NodeB+503 according to the Node B+503 identifier contained in the request. After Node B+503 receives the transmission link establishment request, it establishes a transmission link for UE 504 between itself and RNG 501 to support data transmission between UE 504 and RNG 501. The transmission link established by the Node B+503 between itself and the RNG 501 may be a transmission link based on the Iur interface or a transmission link based on the Iu interface.

After Node B+503 establishes the transmission link for UE 504 between itself and RNG 501, it sends a link establishment response including the transmission link configuration information to RNG 501. After receiving the response, RNG 501 sends the response to Node B+502, and Node B+502 establishes a transmission link between itself and RNG 501 according to the transmission link configuration information contained in the response. After Node B+502 establishes the transmission link, it also releases the transmission link between itself and Node B+503 for UE 504. The transmission link established by Node B+502 between itself and RNG 501 is usually a transmission link based on the Iur interface.

After completing the operation corresponding to the above-mentioned transmission link reconstruction process, UE 504 can send a signal to CN 500, and the signal does not need to go through the congested Iur interface between Node B+502 and Node B+503. The specific signal sending method is:

Node B+503 sends the received signal of UE 504 to RNG 501 via the transmission link established between Node B+503 and RNG 501, after RNG 501 receives the signal for UE 504 from Node B+503, it will The signal is sent to Node B+502 via the transmission link based on the Iur interface established between Node B+502 and RNG 501. After Node B+502 receives the signal directed at UE 504 from RNG 501, it performs wireless interface protocol stack processing on the signal, and sends the processed signal through the Iu interface-based transmission link between Node B+502 and RNG 501 For RNG 501, the transmission link based on the Iu interface is the transmission link still used after UE 504 completes the handover. After RNG 501 receives the signal from Node B+502 to complete the wireless interface protocol stack processing, it sends the signal to CN 500 through the transmission link based on the Iu interface between RNG 501 and CN 500, and the transmission link based on the Iu interface The link is also the transmission link that still applies after the UE 504 completes the handover.

Similar to the UE 504 sending a signal to the CN 500 above, the signal from the CN 500 can also be sent to the UE 504, but the direction of the signal is opposite. Moreover, the signal also does not need to go through the congested Iur interface between NodeB+502 and NodeB+503.

It can be seen that although the transmission link reconstruction process in Figure 5 does not involve the migration process, after the transmission link reconstruction process is completed, UE 504 and CN 500 can communicate normally, and the communication does not need to go through Node B+502 and Node B+503 between Iur interfaces where congestion occurs.

Figure 5 describes the principle of UE communication connection after switching under the same RNG. If the UE switches under different RNGs and performs communication connection after switching, the corresponding communication connection principle is shown in Figure 6. In Figure 6, UE 605 is switched from Node B+603 as the source Node B+ to Node B+604 as the destination Node B+, and the signal sent by UE 605 to Node B+604 will be sent to CN via Node B+603 and RNG 601 600. When Node B+603 detects that the Iur interface between itself and Node B+604 is congested, Node B+603 no longer initiates migration, but initiates a transmission link reconstruction process to establish a connection between RNG 601 and Node B+603 and RNG 601 passes through the transmission link between RNG 602 and Node B+604.

The operations corresponding to the transmission link reconstruction process in Figure 6 are basically the same as the operations corresponding to the transmission link reconstruction process in Figure 5, the only difference is that the transmission link between Node B+604 and RNG 601 is via RNG 602 established.

After completing the operation corresponding to the above-mentioned transmission link reconstruction process, UE 605 can send a signal to CN 600, and the signal does not need to pass through the congested Iur interface between Node B+603 and Node B+604. The specific signal sending method is:

Node B+604 receives the signal of UE 605, and sends the received signal to RNG 601 through the transmission link from RNG 602 to RNG 601, and after RNG 601 receives the signal for UE 605 from Node B+604, it sends The signal is sent to Node B+603 via the transmission link based on the Iur interface established between Node B+603 and RNG 601. After Node B+603 receives the signal directed at UE 605 from RNG601, it performs wireless interface protocol stack processing on the signal, and sends the processed signal to RNG 601, the transmission link based on the Iu interface is a transmission link still applied after the UE 605 completes the handover. After RNG 601 receives the signal from Node B+603 to complete the wireless interface protocol stack processing, it sends the signal to CN 600 through the transmission link based on the Iu interface between RNG 601 and CN 600, and the transmission link based on the Iu interface The same is the transmission link still used after the UE 605 completes the handover.

Similar to the UE 605 sending a signal to the CN 600 above, the signal from the CN 600 can also be sent to the UE 605, but the direction of the signal is opposite. Moreover, the signal also does not need to go through the congested Iur interface between NodeB+603 and NodeB+604.

It can be seen that although the transmission link reconstruction process in Figure 6 does not involve the migration process, after the transmission link reconstruction process is completed, UE 605 and CN 600 can communicate normally, and the communication does not need to go through Node B+603 and Node B+604 between Iur interfaces where congestion occurs.

It can be seen from Figure 5 and Figure 6 that for the UE that has completed the handover, when the Iur interface between the source Node B+ and the destination Node B+ is congested, it is not necessary to perform migration, but to perform the migration described in Figure 5 and Figure 6 The process of rebuilding the transmission link can effectively reduce the frequency of migration, thereby saving the transmission resources of the access network.

Although the transmission link reconstruction process described in Figure 5 and Figure 6 can reduce the frequency of migration, the signal needs to be processed by the wireless interface protocol stack of the source Node B+, which makes the communication interaction process between UE and CN more complicated, which will The communication delay of the UE is increased, resulting in the degradation of the communication quality of the UE.

In order to take into account the communication quality of the UE, the operations shown in FIG. 7 can be performed. In Figure 7, UE 704 is switched from Node B+702 as the source Node B+ to Node B+703 as the destination Node B+, and the signal sent by UE 704 to Node B+703 will be sent to CN via Node B+702 and RNG 701 700. When Node B+702 detects that the Iur interface between itself and Node B+703 is congested, Node B+702 no longer initiates migration, but moves up the wireless interface protocol stack instance established by itself for UE 704 to RNG 701 middle. Afterwards, a transmission link reconstruction process is initiated to establish a transmission link between RNG 701 and Node B+703. The specific operation is:

When Node B+702 detects that the Iur interface between itself and Node B+703 is congested, NodeB+702 sends a macro-diversity merge transfer request (MDC Transfer Request) to RNG 701, which includes the wireless interface protocol for UE 704 Stack configuration information. After the RNG 701 receives the macro-diversity merge migration request from the Node B+702, it creates a new radio interface protocol stack instance for the UE 704 according to the configuration information included in the request. Afterwards, RNG 701 sends a macro-diversity and migration response to Node B+702.

After Node B+702 receives the macro-diversity merge migration response from RNG 701, it deletes the wireless interface protocol stack instance established for UE704.

When RNG 701 sends the macro-diversity combination relocation response to Node B+702, it also sends a transmission link establishment request to Node B+703, and the request includes at least the identifier of UE 704. After Node B+703 receives the transmission link establishment request, it establishes a transmission link for UE 704 between itself and RNG 701 to support data transmission between UE 704 and RNG 701. The transmission link established by the Node B+703 between itself and the RNG 701 may be a transmission link based on the Iur interface or a transmission link based on the Iu interface.

After the Node B+703 establishes the transmission link for the UE 704 between itself and the RNG 701, it sends a link establishment response including the configuration information of the transmission link to the RNG 701.

After completing the operation corresponding to the above-mentioned transmission link reconstruction process, UE 704 can send a signal to CN 700, and the signal does not need to go through the congested Iur interface between Node B+702 and Node B+703. The specific signal sending method is:

Node B+703 sends the received signal of UE 704 to RNG 701 via the transmission link established between Node B+703 and RNG 701, and RNG 701 receives the signal for UE 704 from Node B+703 , the signal is processed by the wireless interface protocol stack, and the processed signal is sent to CN700 through the transmission link based on the Iu interface between RNG 701 and CN 700. The transmission link based on the Iu interface is switched at UE 704 After the transmission link is still applied.

Similar to the UE 704 sending a signal to the CN 700 above, the signal from the CN 700 can also be sent to the UE 704, but the direction of the signal is opposite. Moreover, the signal also does not need to go through the congested Iur interface between NodeB+702 and NodeB+703.

It can be seen that although the transmission link reconstruction process in Figure 7 does not involve the migration process, after the transmission link reconstruction process is completed, UE 704 and CN 700 can communicate normally, and the communication does not need to go through Node B+702 and Node B+703 between Iur interfaces where congestion occurs. Furthermore, the communication interaction between UE 704 and CN700 is much simpler than the corresponding communication interaction in Figure 5, which effectively reduces the communication delay of UE 704 and improves the communication quality of UE 704.

Figure 7 describes the principle of moving up the protocol stack and continuing communication after the UE is switched under the same RNG. The picture is shown in Figure 8. In Figure 8, UE 805 is switched from Node B+803 as the source NodeB+ to Node B+804 as the destination Node B+, and the signal sent by UE 805 to Node B+804 will be sent to CN 800 via Node B+803 and RNG 801 . When Node B+803 detects that the Iur interface between itself and Node B+804 is congested, Node B+803 no longer initiates migration, but moves up the wireless interface protocol stack instance established by itself for UE 805 to RNG 801 middle. Afterwards, the transmission link reconstruction process is initiated to establish the transmission link between RNG 801 and Node B+804.

The operations corresponding to the moving up of the wireless interface protocol stack instance and the process of rebuilding the transmission link in Figure 8 are basically the same as the operations corresponding to the moving up of the wireless interface protocol stack instance and the process of rebuilding the transmission link in Figure 7, with the only difference The reason is that the transmission link between Node B+804 and RNG 801 is established via RNG 802.

After completing the above-mentioned operations corresponding to the moving up of the wireless interface protocol stack instance and the reconstruction process of the transmission link, UE 805 can send a signal to CN 800, and the signal does not need to go through the congested channel between Node B+803 and Node B+804 Iur interface. The specific signal sending method is:

Node B+804 receives the signal of UE 805, and sends the received signal to RNG 801 through the transmission link from RNG 802 to RNG 801. After RNG 801 receives the signal for UE 805 from Node B+804, it The signal is processed by the wireless interface protocol stack, and the processed signal is sent to CN800 through the transmission link based on the Iu interface between RNG 801 and CN 800. The transmission link based on the Iu interface is still after UE 805 completes the handover Application transmission link.

Similar to the UE 805 sending a signal to the CN 800 above, the signal from the CN 800 can also be sent to the UE 805, but the direction of the signal is opposite. Moreover, the signal also does not need to go through the congested Iur interface between NodeB+803 and NodeB+804.

It can be seen that although the transmission link reconstruction process in Figure 8 does not involve the migration process, after the transmission link reconstruction process is completed, UE 805 and CN 800 can communicate normally, and the communication does not need to go through Node B+803 and Node B+804 between Iur interfaces where congestion occurs. Furthermore, the communication interaction between UE 805 and CN800 is much simpler than the corresponding communication interaction in Figure 6, which effectively reduces the communication delay of UE 805 and improves the communication quality of UE 805.

It can be seen from Figure 7 and Figure 8 that for the UE that has completed the handover, when the Iur interface between the source Node B+ and the destination Node B+ is congested, it is not necessary to perform migration, but to perform the migration described in Figure 7 and Figure 8 Moving up the protocol stack and rebuilding the transmission link can effectively reduce the frequency of migration, thereby saving access network transmission resources.

In practical applications, in addition to using the source Node B+ to detect whether the Iur interface between itself and the destination Node B+ is congested, it is also possible to use devices such as the destination Node B+ to detect whether the Iur interface between the source Node B+ and the destination Node B+ is congested , and when congestion occurs on the Iur interface, notify the source Node B+ that the Iur interface is congested by sending a message, etc., to ensure that the corresponding transmission link reconstruction process in Figure 5 and Figure 6 can be carried out, or ensure that Figure 7 and Figure 8 The corresponding protocol stack moves up and the transmission link reconstruction process can be carried out.

It can be seen from the above description that the different communication connection methods provided by the present invention can effectively reduce the frequency of migration and save the transmission resources of the access network.

Claims (10)

1. A communication connection method, characterized in that, after the user terminal UE is handed over to the destination Node B+ by the source base station Node B+, the method comprises the following steps: a. When the communication interface between the source Node B+ and the destination Node B+ is congested, the wireless interface protocol stack instance for the UE established by the source Node B+ is moved up to the wireless network gateway RNG that the source Node B+ is connected to by the UE; b. The RNG controls the target Node B+ to establish a transmission link for the UE between the RNG and the RNG to support the communication between the UE and the core network CN through the target Node B+ and RNG. 2. The method according to claim 1, characterized in that, in step a, the method for moving up the wireless interface protocol stack instance to the RNG is: The source Node B+ sends a macro-diversity merge relocation request to the RNG, which includes the radio interface protocol stack configuration information for the UE; After receiving the macro-diversity combination relocation request from the source Node B+, the RNG creates a new radio interface protocol stack instance for the UE according to the configuration information contained in the request. 3. The method according to claim 2, wherein after the wireless interface protocol stack instance is moved up to the RNG, the method further comprises: The RNG sends a macro-diversity and relocation response to the source Node B+, and the source Node B+ deletes the radio interface protocol stack instance established for the UE after receiving the macro-diversity and relocation response from the RNG. 4. The method according to claim 1, characterized in that, in step b, the method for establishing a transmission link is: The RNG sends a transmission link establishment request to the target Node B+; after receiving the transmission link establishment request from the RNG, the target Node B+ establishes a transmission link for the UE between the target Node B+ and the RNG. 5. The method according to claim 1, wherein in step a, after the wireless interface protocol stack instance is moved up to the RNG, the RNG further sends a macro-diversity merge migration response to the source Node B+; Then in step b, the RNG controls the establishment of the transmission link while the RNG sends a macro-diversity and migration response to the source Node B+. 6. The method according to claim 1, wherein in step b, the transmission link established is a transmission link based on an Iur interface or a transmission link based on an Iu interface. 7. A communication connection method, characterized in that, after the UE is switched from the source Node B+ to the destination Node B+, the method comprises: When the communication interface between the source Node B+ and the destination Node B+ is congested, the source Node B+ controls the RNG connected for UE communication, and respectively establishes transmission links between the RNG and the source Node B+ and between the RNG and the destination Node B+ for UE to support UE to communicate with CN through destination Node B+, RNG, and source Node B+. 8. The method according to claim 7, wherein the method for the source Node B+ to control the RNG to establish the transmission link is: The source Node B+ sends a transmission link establishment request to the RNG, and the RNG sends the request to the destination Node B+ after receiving the transmission link establishment request from the source Node B+; the destination Node B+ establishes a transmission link between itself and Establish a transmission link for the UE between the RNGs, and send a link establishment response containing the configuration information of the transmission link to the RNG; The RNG sends the link establishment response from the destination Node B+ to the source Node B+, and the source NodeB+ establishes a transmission link between itself and the RNG according to the transmission link configuration information contained in the response. 9. The method according to claim 8, characterized in that, after the source Node B+ has established the transmission link, the method further comprises: The source Node B+ releases the transmission link for the UE between itself and the destination Node B+. 10. The method according to any one of claims 7 to 9, wherein the established transmission link between the source NodeB+ and the RNG is a transmission link based on an Iur interface; The established transmission link between the destination Node B+ and the RNG is a transmission link based on an Iur interface, or a transmission link based on an Iu interface.

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