CN108206838A - A kind of SiteServer LBS, method and device - Google Patents

Abstract

This application involves mobile communication technology field more particularly to a kind of SiteServer LBS, method and device, to solve the problems, such as that there is complex disposal process, the waste more process resources of eNB and VMME for the method for UE selections VM in the prior art；SiteServer LBS provided by the embodiments of the present application, including：ENB, at least one VMME and virtual machine distributor, wherein including multiple VM in each VMME；ENB is used for after the first request of UE transmissions is received, and the first request is sent to virtual machine distributor；First request is access request or handover request；Virtual machine distributor is used for after the first request is received, the load information of each VM at least one VMME, is determined as the VM of UE distribution, and send instruction information to the VM；The instruction information is used to indicate the VM and provides service for UE；VM is used for after instruction information is received, and response message is sent to UE by eNB.

Description

A load balancing system, method and device

technical field

The present application relates to the technical field of communication, and in particular to a load balancing system, method and device.

Background technique

With the development of Network Function Virtualization (NFV) technology, a core network (Evolved Packet Core, EPC) is gradually moving towards a Virtual Evolved Packet Core network (Virtual Evolved Packet Core, VEPC). The VEPC follows the architecture of the Mobility Management Entity Pool (MME POOL) in the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) to achieve load balancing of various network elements. In the VEPC, the MME POOL includes multiple virtual mobility management entities (Virtual Mobility Management Entity, VMME), and in order to improve the performance of the VMME, each VMME includes multiple virtual machines (Virtual Machine, VM).

As shown in Figure 1, it is a schematic diagram of the network architecture of the MME POOL in the VEPC. Among them, the customer edge device (CustomerEdge, CE) is the transmission network element between the eNB and the VMME; the virtual layer (Hypervisor) is an intermediate software layer running between the physical server and the operating system, and is used to control various hardware resources. Go virtual. When a user terminal (UserEquipment, UE) enters the coverage area of the MME POOL, if it sends ATTACH/TAU signaling to the base station (Evolved Node B, eNB), the eNB can use the Node Selection (Node Selection, NS) algorithm to select the load for the UE lighter VMME, and forward the attach (ATTACH)/tracking area update (Tracking Area Update, TAU) signaling to the VMME, and then, the load balancing (Load Balance, LB) virtual machine in the VMME again uses the NS algorithm to select The VM with its own internal load is relatively light, and forwards the ATTACH/TAU signaling to the VM. Afterwards, the VM processes the ATTACH/TAU signaling and sends a response carrying the Mobility Management Entity Code (MMEC) The information is sent to the VMME to which the VM belongs, and the VMME forwards the response information to the UE through the eNB.

In the above process, when selecting a VM with a lighter load for the UE, the eNB needs to first use the NS algorithm to select a VMME with a lighter load, and the LB virtual machine in the VMME uses the NS algorithm to select a VM with a lighter load. In this way, the eNB and The VMME needs to execute the NS algorithm separately, and the processing process is complicated, which reduces the execution efficiency of the entire network, and occupies more processing resources of the eNB and the VMME.

It can be seen that the method for selecting a VM for a UE in the prior art has the problems of complicated processing and waste of many processing resources of the eNB and VMME.

Contents of the invention

Embodiments of the present application provide a load balancing system, method, and device, which are used to solve the problems of complicated processing procedures and waste of many processing resources of eNBs and VMMEs existing in methods for selecting VMs for UEs in the prior art.

A load balancing system provided by an embodiment of the present application includes: a base station eNB, at least one VMME, and a virtual machine allocator, wherein each VMME contains multiple virtual machines VM;

The eNB is configured to send the first request to the virtual machine allocator after receiving the first request sent by the user terminal UE; wherein, the first request is an access request or a handover request;

The virtual machine allocator is configured to, after receiving the first request, determine the VM allocated to the UE according to the load information of each VM in at least one VMME, and send indication information to the VM; the indication information is used to indicate the VM providing services to UEs;

The VM is configured to send response information to the UE through the eNB after receiving the indication information.

Optionally, the system further includes: a virtualized infrastructure manager (Virtualized Infrastructure Manager, VIM), configured to determine load information of each VM in at least one VMME, and send the determined load information to the virtual machine allocator;

The virtual machine allocator is specifically configured to: receive load information sent by the VIM.

Optionally, the virtual machine allocator is specifically used to:

Selecting a VM with the smallest load from each VM in at least one VMME according to the received load information of each VM;

The VM with the smallest load is determined as the VM allocated to the UE.

Optionally, each VMME also includes an interface board; the VM is specifically used for:

After receiving the indication information, instruct the interface board in the VMME to which the VM belongs to send a response information;

The interface board is configured to send response information to the UE through the eNB according to the instruction of the VM.

A load balancing method provided in an embodiment of the present application includes:

After receiving the first request sent by the user terminal UE, the base station eNB sends the first request to the virtual machine allocator; wherein, the first request is an access request or a handover request;

After receiving the first request, the virtual machine allocator determines the VM allocated to the UE according to the load information of each VM in at least one VMME, and sends indication information to the VM; the indication information is used to instruct the VM to provide the UE with Serve;

After receiving the indication information, the VM sends response information to the UE through the eNB.

Optionally, the virtual machine allocator is specifically configured to obtain load information according to the following steps:

Receive load information determined and sent by VIM.

Optionally, the virtual machine allocator determines the VM allocated to the UE according to the load information of each VM in at least one VMME, including:

Selecting a VM with the smallest load from each VM in at least one VMME according to the received load information of each VM;

The VM with the smallest load is determined as the VM allocated to the UE.

Optionally, after receiving the indication information, the VM sends response information to the UE through the eNB, including:

After receiving the indication information, the VM instructs the interface board in the VMME to which the VM belongs to send the response information, so that the interface board sends the response information to the UE through the eNB according to the instruction of the VM.

Another load balancing method provided in the embodiment of the present application includes:

The virtual machine allocator receives the first request sent by the eNB; the first request is an access request or a handover request received by the eNB from the user terminal UE;

According to the load information of each virtual machine VM in at least one virtual mobility management entity VMME, determine the VM allocated for the UE, and send instruction information to the VM; the instruction information is used to instruct the VM to provide services for the UE.

Optionally, the virtual machine allocator is specifically configured to obtain load information according to the following steps:

Receive load information determined and sent by VIM.

Optionally, determining the VM allocated to the UE according to the load information of each VM in at least one VMME includes:

Selecting a VM with the smallest load from each VM in at least one VMME according to the received load information of each VM;

The VM with the smallest load is determined as the VM allocated to the UE.

Another load balancing method provided by the embodiment of the present application includes:

The eNB receives the first request sent by the UE; the first request is an access request or a handover request;

A first request is sent to a virtual machine allocator for the virtual machine allocator to determine a VM to allocate for the UE.

A virtual machine allocator provided in an embodiment of the present application includes:

The receiving module is configured to receive a first request sent by the eNB; the first request is an access request or a handover request received by the eNB from the user terminal UE;

The determining module is configured to determine a VM allocated to the UE according to load information of each VM in at least one VMME, and send indication information to the VM; the indication information is used to indicate that the VM provides services for the UE.

Optionally, the receiving module is also used for:

Receive load information determined and sent by VIM.

Optionally, identify modules specifically for:

According to the received load information of each VM, select a VM with the smallest load from each VM in at least one VMME; determine the VM with the smallest load as the VM allocated to the UE.

A base station provided in an embodiment of the present application includes:

A receiving module, configured to receive a first request sent by the UE; the first request is an access request or a handover request;

A sending module, configured to send the first request to the virtual machine allocator, so that the virtual machine allocator determines the VM allocated for the UE.

The load balancing system provided by the embodiment of the present application includes: an eNB, at least one VMME, and a virtual machine allocator, wherein each VMME contains multiple VMs; the eNB is used to assign the first The request is sent to the virtual machine allocator; the first request is an access request or a switching request; the virtual machine allocator is configured to determine the UE allocated to the UE according to the load information of each VM in at least one VMME after receiving the first request VM, and send indication information to the VM; the indication information is used to instruct the VM to provide services for the UE; the VM is used to send response information to the UE through the eNB after receiving the indication information. In this embodiment of the application, when the eNB receives the first request sent by the UE, the eNB can directly send the first request to the virtual machine allocator, and the virtual machine allocator can determine the VM allocated to the UE according to the load information of each VM , in this way, the virtual machine allocator can directly allocate VMs with relatively small loads to the UE, and achieve load balancing among VMs, without requiring the eNB to select a VMME with a relatively light load, and also not requiring the VMME to further select a VM with a relatively light load among the VMMEs , so the process of selecting the VM for the UE can be simplified, the execution efficiency of the entire network can be improved, and the processing resources of the eNB and the VMME can be saved.

Description of drawings

FIG. 1 is a schematic diagram of a network architecture of an MME POOL in a VEPC in the prior art;

FIG. 2 is a schematic diagram of a load balancing system provided in Embodiment 1 of the present application;

FIG. 3 is a schematic diagram of another load balancing system provided in Embodiment 2 of the present application;

FIG. 4 is a flowchart of a load balancing method provided in Embodiment 3 of the present application;

FIG. 5 is a flowchart of another load balancing method provided in Embodiment 4 of the present application;

FIG. 6 is a structural diagram of a virtual machine allocator 60 provided in Embodiment 5 of the present application;

FIG. 7 is a structural diagram of a base station 70 provided for Embodiment 6 of the present application.

Detailed ways

The load balancing system provided by the embodiment of the present application includes: an eNB, at least one VMME, and a virtual machine allocator, wherein each VMME contains multiple VMs; the eNB is used to assign the first The request is sent to the virtual machine allocator; the first request is an access request or a switching request; the virtual machine allocator is configured to determine the UE allocated to the UE according to the load information of each VM in at least one VMME after receiving the first request VM, and send indication information to the VM; the indication information is used to instruct the VM to provide services for the UE; the VM is used to send response information to the UE through the eNB after receiving the indication information. In this embodiment of the application, when the eNB receives the first request sent by the UE, the eNB can directly send the first request to the virtual machine allocator, and the virtual machine allocator can determine the VM allocated to the UE according to the load information of each VM , in this way, the virtual machine allocator can directly allocate VMs with relatively small loads to the UE, and achieve load balancing among VMs, without requiring the eNB to select a VMME with a relatively light load, and also not requiring the VMME to further select a VM with a relatively light load among the VMMEs , so the process of selecting the VM for the UE can be simplified, the execution efficiency of the entire network can be improved, and the processing resources of the eNB and the VMME can be saved.

The embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one

As shown in FIG. 2 , it is a schematic diagram of a load balancing system provided by Embodiment 1 of the present application, wherein a customer edge device (Customer Edge, CE) is a transmission network element between an eNB and a VMME; a virtualization layer (Hypervisor) is a running The intermediate software layer between the physical server and the operating system is used to virtualize various hardware resources.

The eNB 201 is configured to, after receiving the first request sent by the UE, send the first request to the virtual machine allocator; wherein, the first request is an access request or a handover request. In the specific implementation process, when the UE enters the coverage area of the MME POOL, it can send the first request to the eNB. Here, if the UE sends the ATTACH signaling to the eNB, the first request is an access request; if the UE sends the eNB What is sent is TAU signaling, and the first request is a handover request.

The virtual machine allocator 202 is configured to, after receiving the first request, determine the VM allocated for the UE according to the load information of each VM in at least one VMME, and send indication information to the VM; the indication information is used to indicate the The VM provides services for the UE.

Optionally, the load balancing system further includes a VIM, configured to determine load information of each VM in at least one VMME, and send the determined load information to the virtual machine allocator.

Specifically, the VIM can detect the load information of each VM in each VMME in real time, and periodically send the detected load information to the virtual machine allocator.

In the specific implementation process, when the virtual machine allocator receives the first request, it can select the VM with the smallest load from each VM in at least one VMME according to the received load information of each VM, and select the VM with the smallest load Determined as the VM allocated to the UE.

For example, determine the load ratio between VMs, and determine the VM with the smallest value in the load ratio as the VM allocated to the UE; or, sort each VM according to the load (the number of UEs served) from small to large, and rank The first VM is determined to be the VM allocated to the UE.

The VM 203 is configured to send response information to the UE through the eNB after receiving the indication information.

Here, the response information includes ATTACH response information and TAU response information, both of which carry MMEC, so that the UE can find a VM serving it according to the MMEC.

Optionally, each VMME also includes an interface board. When the VM receives the indication information, it can instruct the interface board in the VMME to which the VM belongs to send response information. Afterwards, the interface board sends a response to the UE through the eNB according to the instructions of the VM. information.

The load balancing system provided by the embodiment of the present application includes: an eNB, at least one VMME, and a virtual machine allocator, wherein each VMME contains multiple VMs; the eNB is used to assign the first The request is sent to the virtual machine allocator; the first request is an access request or a switching request; the virtual machine allocator is configured to determine the UE allocated to the UE according to the load information of each VM in at least one VMME after receiving the first request VM, and send indication information to the VM; the indication information is used to instruct the VM to provide services for the UE; the VM is used to send response information to the UE through the eNB after receiving the indication information. In this embodiment of the application, when the eNB receives the first request sent by the UE, the eNB can directly send the first request to the virtual machine allocator, and the virtual machine allocator can determine the VM allocated to the UE according to the load information of each VM , in this way, the virtual machine allocator can directly allocate VMs with relatively small loads to the UE, and achieve load balancing among VMs, without requiring the eNB to select a VMME with a relatively light load, and also not requiring the VMME to further select a VM with a relatively light load among the VMMEs , so the process of selecting the VM for the UE can be simplified, the execution efficiency of the entire network can be improved, and the processing resources of the eNB and the VMME can be saved.

Embodiment two

As shown in FIG. 3 , it is a schematic diagram of another load balancing system provided by Embodiment 2 of the present application.

Optionally, the VIM may detect the load information of each VM in each VMME in real time, and periodically send the detected load information to the virtual machine allocator.

In the specific implementation process, when the UE enters the coverage area of the MME POOL, it can send ATTACH/TAU signaling to the eNB. After receiving the ATTACH/TAU signaling, the eNB can directly Send it to the virtual machine allocator. Further, after receiving the ATTACH/TAU signaling, the virtual machine allocator selects the VM with the lightest load to assign to the UE according to the load of each VM sent by the VIM, and assigns the ATTACH /TAU signaling is sent to the VM, and then the VM parses the received ATTACH/TAU signaling, and after completing the UE authentication and other services, it sends the ATTACH/TAU response information carrying MMEC to the VMME to which the VM belongs an interface board, and the interface board sends the response information to the UE through the eNB.

In the above process, the virtual machine allocator can determine the load ratio among the VMs according to the load status of each VM sent by the VIM, and then determine the VM with the smallest value in the load ratio as the VM allocated to the UE; Each VM is sorted according to the load (the number of serving UEs) from small to large, and the VM ranked first is determined as the VM allocated to the UE.

The load balancing system provided by the embodiment of the present application includes: an eNB, at least one VMME, and a virtual machine allocator, wherein each VMME contains multiple VMs; the eNB is used to assign the first The request is sent to the virtual machine allocator; the first request is an access request or a switching request; the virtual machine allocator is configured to determine the UE allocated to the UE according to the load information of each VM in at least one VMME after receiving the first request VM, and send indication information to the VM; the indication information is used to instruct the VM to provide services for the UE; the VM is used to send response information to the UE through the eNB after receiving the indication information. In this embodiment of the application, when the eNB receives the first request sent by the UE, the eNB can directly send the first request to the virtual machine allocator, and the virtual machine allocator can determine the VM allocated to the UE according to the load information of each VM , in this way, the virtual machine allocator can directly allocate VMs with relatively small loads to the UE, and achieve load balancing among VMs, without requiring the eNB to select a VMME with a relatively light load, and also not requiring the VMME to further select a VM with a relatively light load among the VMMEs , so the process of selecting the VM for the UE can be simplified, the execution efficiency of the entire network can be improved, and the processing resources of the eNB and the VMME can be saved.

Embodiment three

As shown in FIG. 4 , it is a flow chart of the load balancing method provided by Embodiment 3 of the present application.

S401: After receiving the first request sent by the UE, the eNB sends the first request to the virtual machine allocator; wherein, the first request is an access request or a handover request.

S402: After receiving the first request, the virtual machine allocator determines the VM allocated to the UE according to the load information of each VM in at least one VMME, and sends indication information to the VM; the indication information is used to indicate that the VM is UEs provide services.

In the specific implementation process, the virtual machine allocator may receive the load information determined and sent by the VIM, and further, according to the received load information of each VM, select the VM with the smallest load from each VM in at least one VMME, and place the The VM with the least load is determined as the VM allocated to the UE.

S403: After receiving the indication information, the VM sends response information to the UE through the eNB.

In a specific implementation process, after the VM receives the indication information, it can instruct the interface board in the VMME to which the VM belongs to send response information, so that the interface board can send the response information to the UE through the eNB according to the instruction of the VM.

In this embodiment of the present application, after receiving the first request sent by the UE, the eNB sends the first request to the virtual machine allocator; wherein, the first request is an access request or a handover request; the virtual machine allocator receives the first request After a request, the VM allocated to the UE may be determined according to the load information of each VM in at least one VMME, and indication information is sent to the VM; the indication information is used to indicate that the VM provides services for the UE; the VM receives the indication After receiving the information, the eNB sends the response information to the UE. In this way, the virtual machine allocator can directly allocate a VM with a relatively small load to the UE to achieve load balancing among the VMs, without requiring the eNB to select a VMME with a relatively light load, and also not requiring the VMME to further select a VM with a relatively light load in the VMME. Therefore, the process of selecting a VM for the UE can be simplified, the execution efficiency of the entire network can be improved, and the processing resources of the eNB and the VMME can be saved.

Embodiment Four

As shown in FIG. 5 , it is a flowchart of another load balancing method provided in Embodiment 4 of the present application.

S501: The eNB receives a first request sent by the UE; the first request is an access request or a handover request;

S502: Send the first request to the virtual machine allocator, so that the virtual machine allocator determines the VM allocated for the UE.

In the implementation of this application, after receiving the first request sent by the UE, the eNB can directly send the first request to the virtual machine allocator, so that the virtual machine allocator can determine the VM allocated for the UE, and the eNB does not need to select a VMME with a lighter load , so the processing resources of the eNB can be saved.

Based on the same inventive concept, the embodiment of the present application also provides a virtual machine allocator and a base station corresponding to the load balancing method. Since the problem solving principles of the virtual machine allocator and the base station are similar to the load balancing method of the embodiment of the present application, the virtual machine For the implementation of the allocator and the base station, refer to the implementation of the method, and repeated descriptions will not be repeated.

Embodiment five

As shown in FIG. 6, the virtual machine allocator 60 structure diagram provided by Embodiment 5 of the present application includes:

The receiving module 601 is configured to receive a first request sent by the eNB; the first request is an access request or a handover request received by the eNB from the user terminal UE;

The determining module 602 is configured to determine a VM allocated to the UE according to the load information of each VM in at least one VMME, and send indication information to the VM; the indication information is used to indicate that the VM provides services for the UE.

Optionally, the receiving module 601 is also used for:

Receive load information determined and sent by VIM.

Optionally, the determining module 602 is specifically configured to:

According to the received load information of each VM, select a VM with the smallest load from each VM in at least one VMME; determine the VM with the smallest load as the VM allocated to the UE.

Embodiment six

As shown in FIG. 7, the structure diagram of the base station 70 provided in Embodiment 6 of the present application includes:

The receiving module 701 is configured to receive a first request sent by the UE; the first request is an access request or a handover request;

The sending module 702 is configured to send the first request to the virtual machine allocator, so that the virtual machine allocator determines the VM allocated for the UE.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

While preferred embodiments of the present application have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be construed to cover the preferred embodiment and all changes and modifications which fall within the scope of the application.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (11)

1. A load balancing system, characterized in that the system comprises: a base station eNB, at least one virtual mobility management entity VMME and a virtual machine allocator, wherein each VMME contains multiple virtual machines VM; The eNB is configured to send the first request to the virtual machine allocator after receiving the first request sent by the user terminal UE; the first request is an access request or a handover request; The virtual machine allocator is configured to, after receiving the first request, determine the VM allocated for the UE according to the load information of each VM in the at least one VMME, and send indication information to the VM; The indication information is used to instruct the VM to provide services for the UE; The VM is configured to send response information to the UE through the eNB after receiving the indication information. 2. The system according to claim 1, further comprising: a virtual infrastructure manager (VIM), configured to determine the load information of each VM in the at least one VMME, and the determined sending load information to the virtual machine allocator; The virtual machine allocator is specifically configured to: receive the load information sent by the VIM. 3. The system according to claim 2, wherein the virtual machine allocator is specifically used for: Selecting a VM with the smallest load from each VM in the at least one VMME according to the received load information of each VM; The VM with the smallest load is determined as the VM allocated to the UE. 4. The system according to claim 1, wherein an interface board is also included in each VMME; the VM is specifically used for: After receiving the indication information, instruct the interface board in the VMME to which the VM belongs to send the response information; The interface board is configured to send the response information to the UE through the eNB according to the instruction of the VM. 5. A load balancing method, characterized in that the method comprises: After receiving the first request sent by the user terminal UE, the base station eNB sends the first request to the virtual machine allocator; the first request is an access request or a handover request; After receiving the first request, the virtual machine allocator determines the VM allocated for the UE according to the load information of each VM in at least one VMME, and sends indication information to the VM; the indication information uses instructing the VM to provide services for the UE; After receiving the indication information, the VM sends response information to the UE through the eNB. 6. The method according to claim 5, wherein the virtual machine allocator is specifically configured to obtain the load information according to the following steps: The load information determined and sent by the virtual infrastructure manager VIM is received. 7. The method according to claim 6, wherein the virtual machine allocator determines the VM allocated for the UE according to the load information of each VM in at least one VMME, comprising: Selecting a VM with the smallest load from each VM in the at least one VMME according to the received load information of each VM; The VM with the smallest load is determined as the VM allocated to the UE. 8. The method according to claim 5, wherein the VM sends response information to the UE through the eNB after receiving the indication information, comprising: After receiving the indication information, the VM instructs the interface board in the VMME to which the VM belongs to send the response information, so that the interface board sends the response information to the UE through the eNB according to the indication of the VM. The response message. 9. A virtual machine allocator, characterized in that the virtual machine allocator comprises: The receiving module is configured to receive a first request sent by a base station eNB; the first request is an access request or a handover request received by the eNB from a user terminal UE; The determination module is configured to determine the VM allocated for the UE according to the load information of each virtual machine VM in at least one virtual mobility management entity VMME, and send indication information to the VM; the indication information is used to indicate that the VM is The UE provides services. 10. The virtual machine allocator according to claim 9, wherein the receiving module is also used for: The load information determined and sent by the virtual infrastructure manager VIM is received. 11. The virtual machine allocator according to claim 10, wherein the determining module is specifically used for: According to the received load information of each VM, select a VM with the smallest load from each VM in the at least one VMME; determine the VM with the smallest load as the VM allocated to the UE.