CN111432004A - Mobile communication system and cache method thereof - Google Patents
Mobile communication system and cache method thereof Download PDFInfo
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- CN111432004A CN111432004A CN202010229979.5A CN202010229979A CN111432004A CN 111432004 A CN111432004 A CN 111432004A CN 202010229979 A CN202010229979 A CN 202010229979A CN 111432004 A CN111432004 A CN 111432004A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
- H04L67/5682—Policies or rules for updating, deleting or replacing the stored data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The application provides a mobile communication system and a cache method thereof, wherein the mobile communication system comprises: the system comprises an Internet source server, a core network, a wireless access network and user equipment, wherein the Internet server is in communication connection with the core network, the core network is connected with the wireless access network through a return link, and the wireless access network is connected with the user equipment through a wireless network; the access point of the wireless access network is provided with a mobile edge computing server, the access point of the wireless access network and the mobile edge computing server form a mobile edge computing node, and the mobile edge computing server stores cache contents; the user request transmitted from the user equipment to the wireless access network is processed by the local mobile edge computing server which is accessed by the user request, if the mobile edge computing server hits the content of the user request, the mobile edge computing server directly responds to the user request. The method and the device can unload the repeated flow locally, greatly relieve the loads of the core network and the return link and reduce the time delay of the user.
Description
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a mobile communication system and a caching method thereof.
Background
With the rapid development of wireless communication technology, the capabilities of communication systems have been unprecedentedly developed, but in recent years, with the rise of media, multimedia services increasingly occupy most of the traffic in communication systems. By year 2017 Cisco VNI reports that global IP network traffic will reach 278EB per month by 2021, the explosive traffic growth poses serious challenges for communication systems and, in addition, multimedia traffic occupies the vast majority of the traffic. Compared with the conventional service, the multimedia service has a larger file volume and requires a higher transmission rate, and particularly, the high-definition video service requires a higher transmission rate, a higher transmission quality and a lower transmission delay. The massive amount of traffic and the stringent requirements result in an increasing load on the core network. The requirement of the user for the service quality is higher and higher, which causes that the operator has to spend huge cost to upgrade and expand the core network and the data link.
In order to deal with the serious challenge brought by data explosion, various measures are taken, wherein the caching technology is favored by all parties due to the advantages of flexible deployment, low cost, low technical threshold and the like. The currently mainstream caching technology is a Content Delivery Network (CDN), and the CDN reduces the pressure or load on a main server and a network by establishing a content delivery center in each region (e.g., china, east of china, etc.) and offloading content requests to the content delivery center through a route matching technology, and to some extent, reduces the distance between a user and content. The content distribution center has strong caching capacity, the content stored in the content distribution center is a subset of the main server, generally speaking, a content provider marks part of the content as hot content according to the accessed data of the content, and places the repeatedly accessed content in the content distribution center. When a user requests certain content, DNS analysis guides the user to a corresponding content distribution center according to regions, and when the content distribution center does not have the content requested by the user, the main server is requested. The CDN has good effects of reducing the load of the main server, increasing the system throughput and improving the user experience.
However, the CDN is deployed by a content provider, which has a great cost, and needs to rent a machine room, arrange an air conditioning system, arrange a large number of servers, rent a dedicated line, and the like.
On the other hand, CDN can only alleviate network congestion to a certain extent. A CDN-based mobile communication system may be abstracted as fig. 1. As shown in fig. 1, the mobile communication system includes an internet source server, a core network, a radio access network, and a user equipment, wherein a backhaul link is provided between the core network and the radio access network, and the radio access network and the user equipment communicate via the radio link. The internet source server generally refers to a server of a content provider (it is not distinguished here as a main server or a distribution center), and due to the limitation of a communication network, all user requests must be processed by a core network before being sent to the internet. Under the network architecture, the core network and the backhaul link can be regarded as a single-channel tubular structure, which is very easy to become a performance bottleneck of the whole set of system, and when a large number of users access and send requests, the throughput of the backhaul link and the core network is easy to reach saturation first, so that the user experience is reduced.
In addition, CDN technology is limited to a specific content provider, and cannot provide cache service for all content from a global perspective, and for a user, only a content provider accessing a CDN server is able to obtain cache acceleration service, but the CDN deployment requires a huge cost, and not all content providers have this capability, so there is a limit to improving user experience.
Disclosure of Invention
The application aims to provide a mobile communication system and a cache method thereof, which can relieve the load of a core network and a return link, reduce the time delay of a user and improve the user experience; meanwhile, the operator can bring improvement of network performance with lower cost and cost.
The present application provides a mobile communication system including: the system comprises an Internet source server, a core network, a wireless access network and user equipment, wherein the Internet server is in communication connection with the core network, the core network is connected with the wireless access network through a return link, and the wireless access network is connected with the user equipment through a wireless network; the access point of the wireless access network is provided with a mobile edge computing server, the access point of the wireless access network and the mobile edge computing server form a mobile edge computing node, and the mobile edge computing server stores cache contents; the user request transmitted from the user equipment to the wireless access network is processed by the local mobile edge computing server which is accessed by the user request, if the mobile edge computing server hits the content of the user request, the mobile edge computing server directly responds to the user request.
Preferably, if the mobile edge computing server misses the content of the user request, the radio access network forwards the user request to the core network.
Preferably, the mobile communication system further comprises a mobile edge computing center control node, which is responsible for providing configuration information and services for the mobile edge computing server.
Preferably, the mobile edge computing server comprises a user request processing module, and the user request processing module comprises a connection management submodule; the load of the connection management submodule schedules user access, wherein the connection management submodule adopts a multi-process mode, and each process only has one thread; and the connection management submodule processes the accessed user connection in a polling mode.
Preferably, the mobile edge computing server includes a resource management module, and the resource management module separately encapsulates the storage resource, the computing resource, and the network resource.
Preferably, the cache routing policy of the mobile edge computing nodes is a cooperative cache, which allows cache transmission between the mobile edge computing nodes; and the mobile edge computing node inquires cache contents through a cache routing table, and the cache routing table records the cache contents and the mobile edge computing node for storing the cache contents.
Preferably, the mobile edge computing node further includes a caching algorithm module, and the caching algorithm module is disposed integrally with or separately from the mobile edge computing server.
The present application also provides a caching method of a mobile communication system, including: the mobile edge computing server accesses a user request; the mobile edge computing server packages the user request and distributes a session ID for the user request; the mobile edge computing server analyzes an application layer protocol used by a user and the content requested by the user; the mobile edge computing server judges whether the content requested by the user is hit or not; and if so, the mobile edge computing server responds to the user request.
Preferably, if the local mobile edge computing server misses the content of the user request, the mobile edge computing server forwards the user request to the core network.
After the user requests to access the mobile edge computing server, the mobile edge computing server authenticates the user and confirms whether the user enjoys cache acceleration service or not; if yes, the mobile edge computing server encapsulates the user request.
The technical effect that this application realized is as follows:
1. according to the method and the device, the user request is directly responded under the condition that the data required by the user exists in the cache content of the local MEC node, the repeated flow can be unloaded locally, meanwhile, the loads of a core network and a return link are greatly relieved, the user time delay is reduced, and the user experience is improved; meanwhile, the operator can bring improvement of network performance with lower cost and cost.
2. The method and the device support the integrated deployment and the separated deployment of the cache algorithm module and the MEC server, are flexible and simple in deployment, do not need to modify the existing communication system greatly, and are low in cost.
3. The method and the system support two strategies of cooperative cache routing and non-cooperative cache routing, and the configuration of an operator is flexible.
4. The method and the device support an online updating cache algorithm, and are convenient to update.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is an architecture diagram of a prior art mobile communication system;
fig. 2 is a schematic architecture diagram of a mobile communication system according to an embodiment of the present application;
fig. 3 is a functional structure diagram of an MEC server provided in an embodiment of the present application;
fig. 4 is an uplink flow chart of user data of the mobile communication system according to the embodiment of the present application;
fig. 5 is a flowchart of a caching method in a mobile communication system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 2 is a schematic architecture diagram of a mobile communication system according to an embodiment of the present application. As shown in fig. 2, the mobile communication system includes an internet source server, a core Network, a Radio Access Network (RAN), and a user equipment. A Mobile Edge Computing (MEC) server is deployed at an Access Point (AP) in a wireless Access network, and the MEC server includes a cache processing module. The mobile edge computing system is to deploy a general server at the edge (e.g. base station) of a conventional network, so that the network edge also has computing capability, and with a proper protocol and interface, user data can be processed directly at the network edge without occupying bandwidth resources of a backhaul link and a core network.
In order to highlight the difference between the present application and the communication network architecture in the prior art, the cache processing module is independent of the MEC server in the form of cache in fig. 2, and plays a role in illustration. However, in practical applications, the MEC server and the cache processing module belong to the same node logically, and physically, the MEC server and the cache processing module generally belong to the same physical machine or the same cluster.
As another embodiment, the MEC server and the cache processing module are independently installed at an access point of the radio access network.
The following description is based on the integration of the two into one, and the two are collectively referred to as an MEC server (one logical node). The combination of the base station of the radio access network and the MEC server is also referred to as a cache node or MEC node.
According to the application, a user request transmitted to a wireless access network by user equipment through a wireless link is processed by a local MEC server (namely, the MEC server deployed along with an AP accessed by a user), and if the local MEC server caches the content requested by the user, the user request is directly responded locally; if the content requested by the user is not cached locally, the user request is forwarded to the core network through the return link for processing.
As shown in fig. 2, the mobile communication system further includes a Mobile Edge Computing (MEC) central control node. The MEC central control node is used as a central node of the MEC server and is responsible for providing configuration information and service for other MEC nodes.
When the MEC node is initialized, the MEC node firstly performs initial initialization according to a configuration file, and the method comprises the following steps: default cache content type setting, default cache policy setting, configuration of default cache routing policy (including execution policy during local cache miss), configuration of default port, configuration of default cache update period, and configuration of default control node address.
After initialization is completed, the MEC node tries to connect with the MEC central control node, service registration is carried out at the MEC central control node, and basic information of the node is reported to the MEC central control node: including node ID, cache space size, hardware device information, content cache list, supported cache policy list, supported cache routing policy list, etc.
After receiving the service registration message of the MEC node, the MEC central control node issues basic configuration information, which comprises the following steps: the method comprises the steps of cache strategy, cache routing strategy, cache updating period, initial cache reporting time and user authority server address.
The cache routing strategy of the MEC node comprises a cooperative cache and a non-cooperative cache. The cooperative cache allows cache transmission between the MEC nodes, the MEC nodes inquire cache contents through a cache routing table, and the cache routing table records the cache contents, the MEC nodes storing the cache contents and the estimated transmission delay.
When the cache routing strategy of the MEC node is configured as a cooperative cache, the MEC central control node also issues a cache routing table to the MEC node, and the MEC node initializes a local cache list according to the cache routing table and updates the cache. In subsequent operations, the MEC central control node periodically updates the cache routing table to the MEC node.
When the cache routing strategy of the MEC node is configured to be a non-cooperative cache, the MEC central control node issues a 'suggested cache list' according to the cache list of the MEC node, and the MEC node initializes the cache list and updates the cache. And after receiving the configuration information, the MEC node replaces the original default configuration. And the MEC node performs first cache updating according to the configured initial cache reporting time and reports the latest cache list to the MEC central control node. In the subsequent operation, the MEC node performs cache updating according to the configured cache updating period and reports the latest cache list to the MEC central control node.
Specifically, fig. 3 shows a functional structure of the MEC server provided in the embodiment of the present application. The MEC server comprises an MEC service support system module, a user request processing module, a resource management module, a cache processing module and a basic service module.
Data in the communication network is divided into two types, i.e., control plane data and user plane data, and uplink flow of data is shown in fig. 4, and downlink flow is similar, which is not described herein again. As shown in fig. 4, the base station of the radio access network is connected to the core network through an S1 interface, and the data from the base station is processed by the MEC server and then transmitted to the core network. For the control plane signaling, the MEC server forwards the control plane signaling to the core network through the MEC service support system module in a transparent transmission mode without additional processing, but needs to analyze part of signaling information in the transparent transmission process to obtain user context information, such as a user IP address, a user GTP message header ID, and the like. For the user plane data, the MEC service support system removes the GTP packet header of the user plane interface S1-U packet of S1, then analyzes the information such as the target IP address, the source IP address, the port, etc. of the IP packet, and branches part of the data to other modules of the MEC server for processing according to the configured splitting rule. In the case of a cache miss, the portion of the data is passed through to the core network for further processing.
The processing of the user plane data is mainly explained in detail below in connection with the large modules of the MEC server.
The user request processing module comprises a safety control submodule, a connection management submodule, a protocol analysis submodule and a content analysis submodule.
All user requests accessed by service distribution through the MEC service support system are processed by the security control sub-module firstly, and the processing comprises the following steps:
1. caching speeds up authentication. If the operator uses the system of the application to perform cache acceleration as a value-added service and opens the cache acceleration service for part of users, the security control sub-module firstly authenticates the user requesting data. If the operator opens the cache acceleration service for all the users, authentication is not required. Such an arrangement supports multiple configurations of operators with greater flexibility.
2. And managing certificates. The user needs to install the relevant digital certificate of the operator to enjoy the cache acceleration function, so the security control sub-module manages the digital certificate so as to be normally used in the subsequent use process.
The connection management submodule is mainly responsible for scheduling user access. In the face of a large number of accesses of users, reasonable data flow control needs to be performed so as to ensure the user experience under the condition of large-scale user access. The connection management submodule adopts a multi-process mode, each process only has one thread, and meanwhile, the accessed user connection is processed in a polling mode, namely the user connection is activated after the data of the user connection is prepared, otherwise, the user connection is in a dormant state. After the user requests access, the information sent by the user is obtained and then added into a user request pool for unified management and scheduling. The polling mode enables the system to serve other users when long connection users exist, and because each process only has one thread, the overhead of thread switching and lock competition is saved.
After the request data packet sent by the user is obtained, the protocol analysis submodule analyzes the user data to obtain an application layer protocol used by the user. And starting a corresponding proxy server aiming at the used protocol, and in the proxy server, analyzing the request content of the user by a content analysis submodule to obtain the content required by the user. After the actual request of the user is extracted, judging whether the content requested by the user is the type cached by the MEC node according to the configuration file, and if not, forwarding the request to an Internet source server through a core network; and if so, carrying out cache query according to the cache list of the MEC node and the set cache routing rule. And if the content is not hit, the request is sent to an Internet source server to carry out content request, and then the user is responded. And if so, directly responding to the user. In the content response process, the content analysis submodule performs user behavior data collection according to the configuration file, the user behavior data collection is only for the accessed content type which is the type targeted by the cache service, and the collected information includes but is not limited to: the content of the user's request, the time of the request generation, the location of the request generation (geographical location), the communication channel environment, the ratio of the traffic consumed by the request to the total traffic of the content.
The cache processing module provides an operating environment of a cache algorithm, and comprises a data acquisition sub-module, a data conversion sub-module and a cache storage sub-module.
The method and the device support two caching algorithms of integrated deployment and separated deployment with the MEC server. The caching algorithm is deployed as a sub-module of the MEC server in an integrated deployment mode with the MEC server, such as the caching algorithm sub-module shown in fig. 3.
Considering that the computing capacity of some equipment is limited and cannot meet the high computing power required by the caching algorithm, the caching algorithm module is separately deployed as an external system and the MEC server, and the MEC server uses a network interface to communicate with the caching algorithm system in the deployment mode.
Specifically, the cache processing module determines which cache algorithm is adopted according to the configuration file, and supports online algorithm updating. And the MEC server provides an external interface, and separately deploys the call interface request data when a cache algorithm with high complexity and large calculation amount is deployed.
Specifically, the data acquisition sub-module is responsible for extracting the user behavior data collected by the user request processing module. However, generally, such information cannot be directly input into a plug-in caching algorithm or an integrated caching algorithm sub-module. And the data conversion sub-module performs data conversion, preprocesses the data to meet the format required by the cache algorithm, and transmits the data to the plug-in cache algorithm or the integrated cache algorithm sub-module.
And the plug-in cache algorithm or the integrated cache algorithm sub-module receives the preprocessed data, predicts the preference of the user and decides which contents are cached to form a cache list. And the cache placement sub-module receives the cache list from the plug-in cache algorithm or the integrated cache algorithm sub-module, replaces the cache content by combining the current cache list, and reports a new cache list to the MEC central control node after the replacement is finished.
The resource management module performs unified management on all resources. The resources of the MEC node are generally divided into storage resources, computing resources and network resources. The resource management module is used as a support module of other modules, and is used for independently packaging the storage resource, the computing resource and the network resource, so that the other modules can be conveniently called.
The management of the storage resource sub-module is embodied in the maintenance of the cache, and according to the result of the cache algorithm, the cache node periodically performs cache updating (generally performed when the load is low), and at this time, performs cache updating according to the new and old cache lists. In addition, in order to support the requirement of the user request processing module, for example, reading the cache when the cache hit is known, and in order to shield the difference of the bottom implementation, the storage resource submodule is accessed through the abstract interface.
The management of the computing resource sub-module is embodied on the thread pool, when the computing resource is requested, a computing task is firstly constructed and submitted to the computing resource sub-module, the task is finally put into the thread pool, and the thread pool performs task execution and task scheduling, such as content regeneration scene.
It should be noted that whether the content is reproduced or not is determined by the user response policy, and the computing resource submodule is only responsible for scheduling, priority assignment, and the like of tasks. In some content, a plurality of different versions exist (for example, video resources with different definitions, or picture resources with different resolutions, audio with different bit rates, etc.), and conversion can be performed between different versions (for example, high definition video is transcoded into low definition video), and in this case, in order to avoid the situation that cache misses occur due to different versions, the performance of the system is reduced, and in this case, content reproduction needs to be performed. Under the scene, an object needing to be calculated is packaged into a calculation task, an interface of a calculation resource submodule is called to submit the calculation task, and meanwhile, task priority is submitted. And the computing resource submodule distributes computing resources to execute the task after receiving the submitted computing task, and inserts the task into the waiting queue according to the task priority if the computing resources are insufficient.
The network resource submodule is mainly responsible for packaging the network access interface. For example, cache replacement and cache retrieval are performed, when a miss occurs, a request needs to be sent to a source server or other cache nodes are accessed to obtain request content, at this time, a network access request is submitted to a network resource submodule, and a result is returned by the network resource submodule. The network resource is uniformly regulated and controlled by the network resource submodule, and the details of the bottom layer are shielded in the form of an interface. Because of the existence of the abstraction layer, the work mode that the cache processing module and the MEC server are separated technically has no technical bottleneck and has no explicit influence on the work of other modules.
The base service module is a bottom support module. The node communication subsystem is responsible for information interaction with node communication subsystems of other MEC nodes, including neighbor maintenance, data transmission and the like, and is a communication interface between the MEC nodes. The service registration subsystem is responsible for information interaction with the MEC central control node, and comprises node registration, cache list preparation, control information receiving and analyzing and the like which are carried out on the MEC central control node. The basic configuration subsystem is in charge of configuring initial values and default values of the MEC server according to the default configuration file during system initialization on one hand, and is in charge of adjusting the running state of the MEC node according to a control signaling issued by the MEC central control node during running on the other hand. The cache routing subsystem is responsible for maintaining a global cache routing table of the MEC server, a user request needs to perform cache query according to the provided cache routing table under the condition of missing of the node, the cache routing table is generated according to a local cache list and a global cache list obtained from a MEC central control node, a node with the minimum cache obtaining cost is recorded in the cache routing table, and the source server is also one of the nodes of the cache routing table.
In the method and the device, the user request is directly responded under the condition that the data required by the user exists in the cache content of the local MEC node, the repeated flow can be unloaded locally, meanwhile, the load of a core network is greatly relieved, the time delay of the user is reduced, and the user experience is improved. Meanwhile, the operator can bring improvement of network performance with lower cost and cost.
Example two
The application also provides a cache method matched with the mobile communication system. Fig. 5 is a flowchart of a caching method in a mobile communication system according to an embodiment of the present application.
As shown in fig. 5, the caching method includes the following steps:
s510: the user requests access to the MEC server via the MEC service support system.
S520: and the safety control sub-module authenticates the user.
Specifically, under the condition that an operator uses cache acceleration as a value added service, a safety control sub-module extracts a user mark from a user request, and then inquires whether the user mark enjoys cache acceleration service or not in a local MEC node, if so, authentication is successful; otherwise, the safety control sub-module checks whether the user mark enjoys cache acceleration service in the MEC central control node, if so, the authentication is successful; otherwise, authentication fails. If the operator sets the cache acceleration service to be enjoyable by all users, authentication is not performed.
S530: judging whether the authentication is successful, if so, executing S550, otherwise, executing S540: and forwarding the user request to the core network.
S550: and accessing control through a connection management submodule, specifically, encapsulating the user request by the connection management submodule, and distributing a session ID for the user request.
S560: and the protocol analysis submodule analyzes the user data, acquires an application layer protocol used by the user, and starts a corresponding proxy server aiming at the used protocol.
S570: and the content analysis submodule analyzes the content of the user request to obtain the content required by the user.
S580: and inquiring the user request content, and judging whether the local MEC node hits the user request content. If so, perform S590, otherwise, perform S5110: and sending the user request to a core network so as to obtain the content requested by the user from an Internet source server.
Specifically, in S580, after the actual request of the user is extracted, the content analysis sub-module determines, according to the configuration file, whether the content requested by the user is the type cached by the MEC node, and if not, forwards the request to the internet source server through the core network; and if so, carrying out cache query according to the cache list of the MEC node and the set cache routing rule. And if the content is not hit, the request is sent to an Internet source server to carry out content request, and then the user is responded.
S590: a response is made to the user request.
S5100: the content parsing sub-module collects user data, and the collected information includes but is not limited to: the content of the user's request, the time of the request generation, the location of the request generation (geographical location), the communication channel environment, the ratio of the traffic consumed by the request to the total traffic of the content.
The technical effect that this application realized is as follows:
1. according to the method and the device, the user request is directly responded under the condition that the data required by the user exists in the cache content of the local MEC node, the repeated flow can be unloaded locally, meanwhile, the loads of a core network and a return link are greatly relieved, the user time delay is reduced, and the user experience is improved; meanwhile, the operator can bring improvement of network performance with lower cost and cost.
2. The method and the device support the integrated deployment and the separated deployment of the cache algorithm module and the MEC server, are flexible and simple in deployment, do not need to modify the existing communication system greatly, and are low in cost.
3. The method and the system support two strategies of cooperative cache routing and non-cooperative cache routing, and the configuration of an operator is flexible.
4. The method and the device support an online updating cache algorithm, and are convenient to update.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A mobile communication system, comprising: the system comprises an Internet source server, a core network, a wireless access network and user equipment, wherein the Internet server is in communication connection with the core network, the core network is connected with the wireless access network through a return link, and the wireless access network is connected with the user equipment through a wireless network;
a mobile edge computing server is deployed at an access point of the wireless access network, the access point of the wireless access network and the mobile edge computing server thereof form a mobile edge computing node, and cache contents are stored in the mobile edge computing server;
the user request transmitted to the wireless access network by the user equipment is processed by the local mobile edge computing server accessed by the user request, and if the content of the user request is hit by the mobile edge computing server, the mobile edge computing server directly responds to the user request.
2. The mobile communication system of claim 1, wherein the radio access network forwards the user request to the core network if the mobile edge computing server misses the content of the user request.
3. The mobile communication system according to claim 1 or 2, wherein the mobile communication system further comprises a mobile edge computing center control node responsible for providing configuration information and services for the mobile edge computing server.
4. The mobile communication system of claim 3, wherein the mobile edge computing server comprises a user request processing module, the user request processing module comprising a connection management sub-module;
the load of the connection management submodule schedules user access, wherein the connection management submodule adopts a multi-process mode, and each process only has one thread; and the connection management submodule processes the accessed user connection in a polling mode.
5. The mobile communication system of claim 4, wherein the mobile edge computing server comprises a resource management module that separately encapsulates storage resources, computing resources, and network resources.
6. The mobile communication system of claim 1, wherein the cache routing policy of the mobile edge computing node is a cooperative cache allowing cache transfer between mobile edge computing nodes; and the mobile edge computing node inquires cache contents through a cache routing table, and the cache routing table records the cache contents and the mobile edge computing node for storing the cache contents.
7. The mobile communication system of claim 1, wherein the mobile edge computing node further comprises a caching algorithm module, the caching algorithm module being deployed integrally or separately with the mobile edge computing server.
8. A buffering method in a mobile communication system, comprising:
the mobile edge computing server accesses a user request;
the mobile edge computing server packages the user request and distributes a session ID to the user request;
the mobile edge computing server analyzes an application layer protocol used by a user and the content requested by the user;
the mobile edge computing server judges whether the content requested by the user is hit or not;
and if so, the mobile edge computing server responds to the user request.
9. The caching method of claim 8, wherein if the local mobile edge computing server misses the content of the user request, the mobile edge computing server forwards the user request to a core network.
10. The caching method according to claim 8 or 9, further comprising authenticating a user of the mobile edge computing server after the user requests access to the mobile edge computing server, and confirming whether the user enjoys the caching acceleration service; and if so, the mobile edge computing server packages the user request.
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