CN117938814A

CN117938814A - Star-ground fusion communication method and device, base station, terminal and network architecture

Info

Publication number: CN117938814A
Application number: CN202211252130.5A
Authority: CN
Inventors: 葛宁; 姜宇; 苏厉; 杜琴; 崔航; 赵琳; 马克; 崔诗雨; 刘京; 程锦霞; 张龙
Original assignee: Tsinghua University; China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: Tsinghua University; China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2024-04-26

Abstract

The invention provides a satellite-ground convergence communication method, a device, a base station, a terminal and a network architecture, relates to the technical field of communication, and solves the problems that message forwarding between a user and an SIP server in the prior art occupies a large amount of satellite bandwidth resources and cannot meet the communication requirements of large capacity and low time delay. The communication method is applied to a first base station, a Session Initiation Protocol (SIP) server is deployed on the first base station, and the method comprises the following steps: and processing the SIP message through the SIP server of the first base station. According to the scheme provided by the invention, the SIP server is sunk from the network core to the network edge and deployed to each base station, the SIP message can be processed at the network edge, the user data flow can reach the SIP server without passing through the bearing network and the core network, the bandwidth pressure of satellite communication can be reduced, and low-delay high-capacity communication is realized.

Description

Star-ground fusion communication method and device, base station, terminal and network architecture

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a satellite-ground convergence communication method, device, base station, terminal, and network architecture.

Background

Session initiation protocol (Session Initiation Protocol, SIP) is an application layer protocol for setting up, modifying and terminating multimedia session services in an IP network, which is part of the Internet Engineering Task Force (IETF) industry which is constantly standardizing multimedia protocol families, applications including but not limited to voice, video, games, messaging, call control, presence, etc.

When a mobile subscriber communicates using the SIP protocol, the message transmission flow is as shown in fig. 3. Because the SIP server is deployed in the Internet, the request message sent by the mobile user terminal needs to pass through the access network, the bearer network and the core network in order to reach the SIP server. Suppose that user 1-1,1-2 is located within the coverage of base station BS1 and user 2 is located within the coverage of base station BS 2. When the user 1-1 initiates a communication request to the user 2, the message transmission flow of the user communication under different base stations is ①～⑧ in fig. 4; even if both parties are within the coverage of the same base station, the message sent by user 1-1 needs to go through the process ①～⑥、⑨～⑩ to reach user 1-2.

The ground mobile network can provide strong access capability for areas with relatively gathered human mouths, but has the advantages of wide coverage, flexible networking, no limitation of geographic environment and the like due to high ground network laying difficulty, high maintenance cost and difficult efficient coverage in rural areas, oceans and other areas, and can provide effective service in remote mountain areas, air areas, deserts, oceans and other areas so as to make up the coverage deficiency of the ground mobile network caused by technical or economic factors. There is a lot of research on "satellite-ground fusion communication", in which the "carrier network fusion" mode has the advantages of loose coupling and easy implementation, and is most widely used. In the 'carrier network convergence' mode, a satellite communication network is used as a carrier network, and base station signals are transmitted back to the gateway station and transmitted to the core network.

When the mobile user returns a SIP message using a satellite, the communication flow is shown in fig. 4. Similar to the case of terrestrial mobile communication, the request message sent by the mobile user terminal needs to be transmitted sequentially through the base station, the satellite and the gateway station to reach the core network and be sent to the SIP server (corresponding to ①～⑤ in fig. 4), while the message sent from the SIP server needs to be forwarded sequentially through the core network, the gateway station and the satellite to reach the base station corresponding to the user (corresponding to ⑥～⑩ or ⑥～⑧ and fig. 4))。

As shown in fig. 4, since the SIP servers are centrally disposed in the network core, all SIP messages of the user need to pass through the access network, the bearer network, and the core network in order to reach the SIP servers, and messages sent from the SIP servers need to pass through the core network, the bearer network, and the access network in order to reach the user terminal. For the ground communication scene, the network core has enough calculation and storage resources, and the ground transmission network has enough bandwidth resources, so that the transmission process can meet the communication requirements of large capacity and low time delay.

In contrast to conventional terrestrial bearer networks, however, in satellite communications scenarios, the link bandwidth resources between the satellite and the terrestrial base stations, gateway stations, are limited (as shown in fig. 4). If the network architecture of ground communication is directly used, the SIP servers are deployed in a centralized manner in the network core, all messages between the user and the SIP servers need to be forwarded by the satellite, a large amount of satellite bandwidth resources are occupied, and the high-capacity and low-delay communication requirements cannot be met.

Disclosure of Invention

The invention aims to provide a satellite-ground convergence communication method, a device, a base station, a terminal and a network architecture, which are used for solving the problems that a large amount of satellite bandwidth resources are occupied and the communication requirements of large capacity and low time delay cannot be met in the prior art when a message between a user and an SIP server is forwarded.

In order to solve the above technical problems, in a first aspect, an embodiment of the present invention provides a star-to-ground converged communication method, which is applied to a first base station, where a session initiation protocol SIP server is deployed on the first base station, and the method includes:

and processing the SIP message through the SIP server of the first base station.

Optionally, the step of processing, by the SIP server of the first base station, the SIP message includes:

receiving a first call request message sent by a first terminal through an SIP server of the first base station;

Determining a base station where a called second terminal is located according to the first call request message;

And forwarding the first call request message according to the determined base station where the second terminal is located.

Optionally, the step of forwarding the first call request message according to the determined base station where the second terminal is located includes:

Transmitting the first call request message to the second terminal when the base station where the second terminal is located is the first base station;

and under the condition that the base station where the second terminal is located is not the first base station, forwarding the first call request message to the second base station where the second terminal is located through a satellite, so that the second base station receives the first call request message and then sends the first call request message to the second terminal.

Optionally, the step of determining, according to the first call request message, a base station where the called second terminal is located includes:

acquiring address information of a called second terminal according to the first call request message;

and determining the base station where the second terminal is located according to the address information of the second terminal.

Optionally, the step of acquiring address information of the called second terminal according to the first call request message includes:

And according to the first call request message, inquiring address information of the called second terminal in the prestored user information.

Optionally, the pre-stored user information includes:

User directories stored on different storage nodes in advance through a distributed hash table; the user directory stores user information registered on all SIP servers within the target geographical area.

Optionally, the pre-stored user information further includes:

the method comprises the steps of pre-caching first user backup information on a SIP server of a first base station; and/or

And the second user backup information is cached in advance on the sink node bound with the SIP server of the first base station.

Optionally, the first user backup information includes: user information registered on the SIP server of the first base station, and historical user information queried by the SIP server of the first base station;

the second user backup information includes: user information registered on SIP servers of all base stations bound with the sink node.

Optionally, the step of querying address information of the called second terminal in the pre-stored user information according to the first call request message includes:

Inquiring address information of a called second terminal in the first user backup information according to the first call request message;

under the condition that the address information of the second terminal is not queried in the first user backup information, querying the address information of the second terminal in the second user backup information;

And under the condition that the address information of the second terminal is not queried in the second user backup information, querying the address information of the second terminal in the user catalog.

Optionally, according to the first call request message, before inquiring address information of the called second terminal in the prestored user information, the method further comprises the steps of;

selecting a node with the smallest communication time delay with the SIP server of the first base station from different storage nodes as an aggregation node;

Binding the SIP server of the first base station with the sink node.

Optionally, the storage node is a network node deployed simultaneously with the SIP server; or the storage node is a network node deployed independently of the SIP server.

Optionally, the method further comprises:

the SIP server of the first base station sends a re-registration request to a locally registered user terminal at intervals of a first preset period; and/or

The SIP server of the first base station updates the historical user information every a second preset period.

Optionally, the method further comprises:

Receiving a user information change request sent by a third terminal; the user information change request comprises a registration request, an update request or a logout request;

Writing or deleting the user information of the third terminal in the buffer space of the SIP server of the first base station according to the user information change request;

And sending the user information change request to the sink node, so that after the sink node receives the user information change request, writing or deleting the user information of the third terminal in a cache space of the sink node, and sending the user information change request to a corresponding storage node for storage or deletion.

Optionally, the method further comprises:

when the SIP server of the first base station executes writing operation to user information in a cache space and the cache space is full, calculating the storage value of each piece of user information cached in the cache space;

Deleting the user information with the lowest storage value, and writing the user information to be written into the cache space.

Optionally, the user information includes: user registration information and user terminal information;

The user registration information includes one or more of the following: a user name, password;

The user terminal information includes one or more of the following: base station information of the current access of the user terminal, address information of the user terminal and port number information of the user terminal.

Receiving a second call request message sent by a third base station through a satellite by a SIP server of the first base station;

And sending the second call request message to the called fourth terminal.

In a second aspect, an embodiment of the present invention provides a star-to-ground convergence communication device, which is applied to a first base station, where a session initiation protocol SIP server is deployed on the first base station, and the device includes:

and the processing module is used for processing the SIP message through the SIP server of the first base station.

In a third aspect, an embodiment of the present invention provides a base station, including a memory, a processor, and a program stored on the memory and executable on the processor; and the processor realizes the satellite-ground fusion communication method when executing the program.

In a fourth aspect, an embodiment of the present invention provides a readable storage medium having stored thereon a program which, when executed by a processor, implements the steps in a star-to-ground fusion communication method as described above.

In a fifth aspect, an embodiment of the present invention provides a star-to-ground converged network architecture, including:

And the plurality of base stations are provided with one or more Session Initiation Protocol (SIP) servers.

Optionally, the network architecture further includes:

A plurality of storage nodes, on which user directories are stored through a distributed hash table; the user directory stores user information registered on all SIP servers within the target geographical area.

In a sixth aspect, an embodiment of the present invention provides a satellite-ground fusion communication method, which is applied to a terminal, where the method includes:

and sending a first call request message to a SIP server of the first base station, so that the SIP service of the first base station receives and forwards the first call request message.

Optionally, the method further comprises:

and resending the registration request to the SIP server of the first base station at intervals of a first preset period.

Optionally, the method further comprises:

Sending a user information change request to a SIP server of the first base station; the SIP server of the first base station writes or deletes the user information of the third terminal in the buffer space of the SIP server of the first base station according to the user information changing request, and the SIP server of the first base station sends the user information changing request to the sink node, so that after receiving the user information changing request, the sink node writes or deletes the user information of the third terminal in the buffer space of the sink node, and sends the user information changing request to a corresponding storage node for storage or deletion; the user information change request includes a registration request, an update request, or a logout request.

Optionally, the method further comprises:

And receiving a second call request message sent by the first base station, wherein the second call request message is sent to the first base station by a third base station through a satellite.

In a seventh aspect, an embodiment of the present invention provides a satellite-ground fusion communication device, applied to a terminal, where the device includes:

and the sending module is used for sending the first call request message to the SIP server of the first base station, so that the SIP service of the first base station receives and forwards the first call request message.

In an eighth aspect, an embodiment of the present invention provides a terminal, including a memory, a processor, and a program stored on the memory and executable on the processor; and the processor realizes the satellite-ground fusion communication method when executing the program.

In a ninth aspect, an embodiment of the present invention provides a readable storage medium having stored thereon a program which, when executed by a processor, implements the steps in the star-to-ground fusion communication method as described above.

The technical scheme of the invention has the following beneficial effects:

In the traditional mobile communication network architecture, an SIP server is intensively deployed in a network core, and SIP information needs to be transmitted to the network core through an access network and a bearing network to be processed; in the network architecture provided by the invention, the SIP server is sunk from the network core to the network edge and deployed to each base station, so that the SIP message can be processed at the network edge, the user data flow can reach the SIP server without passing through the bearing network and the core network, the bandwidth pressure of satellite communication can be reduced, and low-delay high-capacity communication is realized.

Drawings

Fig. 1 is a flow chart of a satellite-ground fusion communication method applied to a base station according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of a general SIP communication architecture;

FIG. 3 is a flow chart of a general mobile subscriber using SIP communication;

fig. 4 is a schematic diagram of a SIP communication flow in a general star-to-ground converged network;

Fig. 5 is a schematic diagram of a SIP communication flow in a star-to-ground converged network according to an embodiment of the present invention;

fig. 6 is a schematic flow chart of a SIP server querying user information according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a SIP user terminal registration flow provided in an embodiment of the present invention;

FIG. 8 is a schematic diagram of a user information query process according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of another user information query flow provided in an embodiment of the present invention;

Fig. 10 is a schematic structural diagram of a star-ground fusion communication device applied to a base station according to an embodiment of the present invention;

Fig. 11 is a flow chart of a satellite-ground fusion communication method applied to a terminal according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a star-ground fusion communication device applied to a terminal according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

For a better understanding of the present invention, a brief description of the relevant knowledge of SIP will be presented first.

Session initiation protocol SIP is an application-layer protocol for setting up, modifying and terminating multimedia session services in an IP network, applications including but not limited to voice, video, gaming, messaging, call control, presence, etc. Communication systems using the SIP protocol generally include the following components:

(1) User agents (User agents) for creating, sending, receiving SIP messages and managing a SIP session, the SIP User agents can be further divided into User Agent clients (User AGENT CLIENT, UAC) and User Agent servers (User AGENT SERVER, UAS).

(2) A Proxy server (Proxy) located between the UAC and the UAS for facilitating routing of messages between the UAC and the UAS. The proxy server may also perform routing policy control.

(3) A registration server (Register) for receiving the SIP client registration request and storing the location information of the UA transmitting the registration request.

FREESWITCH is an open source telephone exchange platform, which has strong scalability, is a cross-platform multi-protocol telephone soft exchange platform, FREESWITCH provides perfect private exchange functions in software form, and is compatible with various mainstream protocols including SIP, h.323, etc.

A typical application scenario of FREESWITCH is shown in fig. 2, in which FREESWITCH acts as a back-to-back user agent (Back to Back User Agent, B2 BUA). For SIP users, the B2BUA acts as a User Agent Server (UAS) on one side and as a User Agent Client (UAC) on the other side (back-to-back). Meanwhile, FREESWITCH integrates the function of a registration server, and uses an embedded database SQLite to store user registration information (user name, password and the like) and session information (such as client IP address and port number).

In the traditional communication network architecture, the base station only forwards the message, and does not have the capability of processing the SIP message, so that all user requests need to be transmitted to the network core to be processed. The invention sinks the function of the network core to the network edge, and proposes a network architecture capable of processing SIP messages at the base station, thereby reducing the bandwidth pressure of the satellite bearing network and reducing the communication delay.

The star-ground fusion network architecture provided by the embodiment of the invention comprises the following components:

In the embodiment of the invention, part of SIP servers can be deployed on the base station, and the rest of SIP servers are deployed on the core network; or all SIP servers may be deployed on the base station.

The network architecture provided by the invention is mainly applied to SIP communication in a star-ground fusion scene. The invention breaks through the traditional SIP service deployment architecture, and proposes to convert the SIP server from the traditional centralized deployment to the distributed deployment in the deployment mode. SIP servers are identical in position, decentralization is achieved, and system robustness and expansibility are high. Any one server can be added or withdrawn at any time, so that compared with the traditional architecture, the architecture provided by the invention is more flexible to deploy and maintain. In addition, because of the distributed deployment of the SIP servers, users can use nearby SIP servers to realize the processes of access, authentication and the like at any position, the limitation of the attribution of the users is broken, and the mobility of the users is easier to realize. In the deployment position, the invention proposes to sink the SIP server from the network core to the network edge and deploy the SIP server to each base station, the SIP information of the user is analyzed at the base station, the user data flow can reach the SIP server without passing through the bearing network and the core network, the bandwidth pressure of satellite communication can be reduced, and low-delay high-capacity communication is realized.

As shown in fig. 1, the star-to-ground convergence communication method provided by the embodiment of the invention is applied to a first base station, where a session initiation protocol SIP server is deployed on the first base station, and the method includes:

Step 101: and processing the SIP message through the SIP server of the first base station.

In the network architecture provided by the invention, the SIP server is sunk from the network core to the network edge and deployed to each base station, so that the SIP message can be processed at the network edge, the user data flow can reach the SIP server without passing through the bearing network and the core network, the bandwidth pressure of satellite communication can be reduced, and low-delay high-capacity communication is realized.

Optionally, the step 101 includes:

Step 1011: and receiving a first call request message sent by the first terminal through the SIP server of the first base station.

Here, the SIP server deployed at the base station side receives the call request message sent by the terminal, and directly processes the call request message at the network edge without uploading the call request message to the core network.

Step 1012: and determining the base station where the called second terminal is located according to the first call request message.

Here, the SIP server at the base station side determines, according to the first call request message, the base station where the second terminal to be called is located, so that the call request message is smoothly sent to the called terminal based on the base station where the second terminal is located.

Step 1013: and forwarding the first call request message according to the determined base station where the second terminal is located.

Here, the SIP server at the base station forwards the first call request message to the called terminal according to the base station where the second terminal is located.

Specifically, the step 1013 includes:

step 10131: and transmitting the first call request message to the second terminal when the base station where the second terminal is located is the first base station.

Here, when the second terminal to be called is located under the coverage of the same base station (i.e., the first base station) as the first terminal, the first base station directly transmits the first call request message to the second terminal without using satellite transfer.

Step 10132: and under the condition that the base station where the second terminal is located is not the first base station, forwarding the first call request message to the second base station where the second terminal is located through a satellite, so that the second base station receives the first call request message and then sends the first call request message to the second terminal.

Here, when the second terminal and the first terminal are not in the same coverage area of the base station, the first base station transmits the first call request message to the second base station where the second terminal is located through satellite transfer, and then the second base station transmits the first call request message to the second terminal,

At this time, the SIP server sinks from the network core to the network edge and deploys to each base station, so that the call request message sent by the terminal does not need to be processed through multi-layer network uploading, and the call request message can be directly processed on the SIP server at the base station side, thereby saving network resources and improving processing efficiency and response speed.

Optionally, step 1012 includes:

step 10121: and acquiring address information of the called second terminal according to the first call request message.

Here, the SIP server of the first base station first obtains address information of the called terminal according to the first call request message, so as to determine the base station where the called terminal is located based on the address information.

Step 10122: and determining the base station where the second terminal is located according to the address information of the second terminal.

Here, because the SIP server deployed at the base station obtains the address information of the called terminal, the base station where the called terminal is located can be determined based on the address information, and then the first call request message is sent to the called terminal, so that the message does not need to be sent to the core network for processing, network resources are saved, and the processing efficiency and response speed are improved.

For example, as shown in FIG. 5, assume that User 1-1 (User 1-1) and User 1-2 (User 1-2) are located within the coverage of base station BS1, user 2 (User 2) is located within the coverage of base station BS2, and communication between BS1, BS2 needs to be relayed through a satellite. The communication flow is described below separately considering two call cases.

(1) Two users communicate under different base station ranges:

Taking the example of user 1-1 calling user 2, the call request of user 1-1 is transmitted to base station BS1 via access network; after receiving the message, the SIP server 1 (SIP SERVER 1) deployed at the BS1 obtains the address information of the user 2; BS1 transmits the SIP message to SIP server2 of BS2 through satellite relay (SIP SERVER 2); finally the BS2 sends the message to the user 2. The above procedure corresponds to ①～⑤ in fig. 5.

(2) Two users communicate under the same base station:

Taking the example that the user 1-1 calls the user 1-2, the call request of the user 1-1 is transmitted to the base station BS1 through the access network; after receiving the message, the SIP server 1 deployed in the BS1 acquires address information of the user 1-2, and discovers that the user 1-2 and the user 1-1 are positioned in the coverage area of the same base station, and satellite transfer is not needed; the base station BS1 sends a message to the users 1-2. The above procedure corresponds to ①②⑥ in fig. 5.

As can be seen from the above process, when both communication parties are located in different base station ranges, because the SIP server deployed at the base station acquires the address of the target user, the satellite is not required to transmit the message back to the gateway station, but the message is directly transmitted to the base station where the target user is located; when both communication parties are located in the same base station range, satellite forwarding is not needed. Therefore, in the communication architecture provided by the invention, the SIP message of the user can be processed at the network edge, so that the bandwidth pressure of the satellite is reduced.

Optionally, the step 10121 includes:

Step 101211: and according to the first call request message, inquiring address information of the called second terminal in the prestored user information.

At this time, the user information is stored in advance, and after receiving the first call request message, the SIP server of the first base station may query the address information of the called terminal in the user information stored in advance, so as to forward the message.

The present invention proposes a distributed hash table (distributed hash table, DHT) based user directory service as a network infrastructure similar to Domain name resolution system (Domain NAME SYSTEM, DNS) for addressing SIP users.

Based on this, the star-to-ground fusion network architecture of the embodiment of the present invention may further include: the user directory is stored on the plurality of storage nodes through the distributed hash table.

At this time, the pre-stored user information queried in step 101211 may include: user directories stored on different storage nodes in advance through a distributed hash table.

The user directory stores user information registered on all SIP servers within the target region. The target region can be set according to the requirement, such as the target region is global or within China. The user information stored in the user directory may include: user registration information and user terminal information; the user registration information may include one or more of the following: user name, password, etc. for user terminal registration authentication; the user terminal information may include one or more of the following: dynamic information such as base station information accessed by the user terminal currently, address information of the user terminal, port number information of the user terminal and the like. The directory service provided by the invention is responsible for maintaining a distributed user directory and storing the distributed user directory on different storage nodes.

The invention provides the DHT for storing the user information, and can fully utilize the advantages of the distributed hash table in the aspects of expandability and fault tolerance. Meanwhile, the user directory is used as an internet basic service, the user information storage can be decoupled from the SIP server, namely, the proxy service and the registration service of the SIP are decoupled, and the user can use the proxy service and the registration service of the SIP at different positions, so that the flexibility of the SIP service is improved. And the distributed directory is used as an Internet infrastructure and can be supervised by the country, so that monopoly of large companies on user information is eliminated, and user privacy is protected.

At this time, the storage of the user information may be implemented using a DHT-based distributed database (e.g., cassandra, etc.). The user directory deployment mode is flexible, and can be deployed on the base station along with the SIP server; or can be deployed separately on a base station or a core network node or other network nodes.

Continuing to show in fig. 5, when the user 1-1 calls the user 1-2 or the user 2, after receiving the message, the SIP server 1 deployed in the BS1 may query the DHT-based user directory to obtain address information of the user 1-2 or the user 2, and further forward the message based on the address information, without transmitting to the core network for processing, thereby reducing bandwidth pressure of the satellite.

For the above process of querying the user directory by the SIP server, the process may face the problem of too long querying time delay in an actual deployment scenario. In the traditional architecture, because the SIP service is deployed in a centralized way, the storage positions of the SIP server and the user information are the same or close, and no larger network transmission delay exists, so the delay of the SIP server for inquiring the user information is lower. However, the distributed user directory proposed by the present invention is implemented using a distributed hash table, and is deployed as an internet infrastructure around the world, where the storage location of the user information may be far away from the base station where the user is located, and if the SIP server initiates a query to the whole DHT when a session is established each time, the query speed may be affected by too high network delay, thereby reducing the overall performance of the system. Therefore, in order to further improve the overall performance of the system, the invention provides a secondary caching mechanism of user information aiming at the proposed distributed deployment architecture, and the secondary caching mechanism is described in detail as follows.

Optionally, the pre-stored user information further includes:

Wherein the first user backup information may include: user information registered on the SIP server of the first base station, and historical user information queried by the SIP server of the first base station;

The second user backup information may include: user information registered on SIP servers of all base stations bound with the sink node.

At this time, caches are deployed on the local SIP server and the sink node respectively, so that user information can be queried on the local SIP server and the sink node preferentially, the user query time delay is reduced, and the overall performance of the system is improved.

In addition, because the SIP service is distributed, and a group of users (such as a plurality of employees of the same company) with similar geographic positions are likely to have the same communication requirement, i.e. a group of users under the same SIP server are likely to request to query the same user information, the cache is introduced at the SIP server and the historical query result is recorded, so that the number of times that the SIP server queries the user directory can be greatly reduced, and the time delay generated by user addressing is significantly reduced.

Optionally, before the step 101211, the method further includes;

selecting a node with the smallest communication time delay with the SIP server of the first base station from different storage nodes as an aggregation node; binding the SIP server of the first base station with the sink node.

At this time, each SIP server selects a node with the smallest delay from the DHT storage nodes of the user directory, and uses the node as an aggregation node and binds the aggregation node. The sink node is used as an SIP server to access the entry of the user directory, so that the SIP server can access the user directory service nearby, network bandwidth resources are saved, and meanwhile, the user inquiry time delay is reduced, and the overall performance of the system is improved.

Optionally, the step 101211 includes:

At this time, as shown in fig. 6, when the SIP server performs the user information query, the SIP server first queries the local cache, if not hit, queries the sink node cache, if still not hit, queries the DHT user directory, and finally returns the query result to the SIP server. Wherein, the result of the query from the DHT user directory is returned to the SIP server through the sink node.

The following describes three cases of the user information query process according to the relationship between the SIP server and the location of the user to be queried.

(1) Dual user communication under the same SIP server:

As shown in fig. 8, both the User1-2 (User 1-2) and the User1-1 (User 1-1) are within the coverage of the base station BS 1. When the user1-2 calls the user1-1, the SIP server1 (SIP SERVER 1) of the base station BS1 may directly query the local Cache (Cache 1) for the user1-1, so as to further learn that the user1-1 and the user1-2 are within the same coverage area of the base station BS1, and the base station BS1 may directly send the call request message to the user 1-1.

(2) Two users located at different SIP servers, but two SIP servers bind the same sink node to communicate:

As shown in fig. 8, it is assumed that SIP server 1 (SIP SERVER 1) and SIP server2 (SIP SERVER 2) both bind node a as sink nodes. When a User2 (User 2) calls a User1-1 (User 1-1) for the first time, user information of the User1-1 is missed in a local Cache (Cache 2) of the SIP server 2; forwarding the query request to the sink node A, and hit the user information of the user1-1 in the cache (CacheA) of the sink node A; the query result is returned to the SIP server2 and written into the local cache of the SIP server 2. When user2 calls user1-1 for the second time, a hit is made in the local Cache (Cache 2) of SIP server 2.

The two inquiry processes are shown by the black dashed arrows in fig. 8.

(3) Two users located at two SIP servers binding different sink nodes communicate:

As shown in fig. 9, assume that the SIP server (SIP SERVER 1) and the SIP server3 (SIP SERVER 3) bind the node A, B as sink nodes, respectively. When User3 (User 3) first calls User1-1 (User 1-1), the local cache of SIP server3 (SIP SERVER 3) misses; forwarding the query request to the sink node B, the sink node B buffering (CacheB) misses; querying a DHT distributed user directory, and obtaining user information of the user1-1 from the node C, D; the query result is returned to the SIP server3 and written into the local Cache (Cache 3) of the SIP server 3. When the user3 calls the user1-1 for the second time, the local Cache (Cache 3) of the SIP server3 can be hit.

The above-described inquiry process is shown by the black dotted arrow in fig. 9.

From the above, the invention establishes the buffer memory in the SIP server and the sink node respectively, which can accelerate the speed of the SIP server inquiring the user information in the distributed scene, save the network bandwidth resource, and reduce the user inquiring time delay, thereby improving the overall performance of the system.

After the second level caching mechanism is introduced, when the user terminal of the SIP server registers, de-registers or the position changes, the second level caching mechanism can be combined to change the corresponding user information, which is described in detail below.

Optionally, the method further comprises:

Step 102: receiving a user information change request sent by a third terminal; the user information change request includes a registration request, an update request, or a logout request.

Here, when the user terminal performs registration, cancellation, or position change, the SIP server actively transmits a corresponding request to the SIP server, and the SIP server changes the corresponding user information.

Step 103: and writing or deleting the user information of the third terminal in the buffer space of the SIP server of the first base station according to the user information change request.

Here, the SIP server first performs a corresponding writing or deleting operation in the local buffer space according to the user information change request. If the user information changing request is a registration request or an update request, the SIP server firstly performs a writing operation on the corresponding user information in the local cache space, and if the user information changing request is a cancellation request, the SIP server firstly performs a deleting operation on the corresponding user information in the local cache space.

Step 104: and sending the user information change request to the sink node, so that after the sink node receives the user information change request, writing or deleting the user information of the third terminal in a cache space of the sink node, and sending the user information change request to a corresponding storage node for storage or deletion.

After the local cache of the SIP server is updated, the SIP server sends the user information change request to the sink node, and the sink node performs corresponding writing or deleting operation in the cache space according to the user information change request. And then the convergence node sends the user information change request to the DHT storage node for storage or deletion. The sink node may determine the storage node of the user information according to the Hash value, the copy number, and the like of the user information, but is not limited thereto.

At this time, the SIP server is connected to the DHT through the sink node, the SIP server and the sink node provide secondary buffering, the query speed is increased, and the data of the SIP server, the sink node and the DHT are kept synchronous, so that the accuracy of the data is ensured.

For example, as shown in fig. 7, after introducing the secondary cache, an exemplary registration procedure for the SIP user terminal is as follows:

(1) The User terminal transmits registration information including static information such as a User name and a password and dynamic information such as an IP and a port number to the SIP server SIP SERVER.

(2A) The SIP server writes the user information into a Local Cache (Local Cache).

(2B) The SIP server sends the user information to the sink node a.

(3A) The sink node A writes the user information into a Cache (Cache A).

(3B) The sink node decides the storage node of the user information according to the Hash value and the copy number of the user information, and sends the user information to the corresponding node for storage.

In the embodiment of the invention, in order to ensure the real-time effectiveness and accuracy of the local cache data of the SIP server, a passive updating mode and an active updating mode are provided. The following description will be made separately.

For the passive update mode, when the SIP server receives the user information change request as described above, or receives a new query result, the passive update is triggered, and the passive update process may be performed with reference to the foregoing steps 102-104.

However, in the update process, there may be a case that the SIP server needs to write into the cache but the cache space is full, and in order to solve this problem, optionally, the method further includes:

step 105: when the SIP server of the first base station executes writing operation to user information in a cache space and the cache space is full, calculating the storage value of each piece of user information cached in the cache space;

Step 106: deleting the user information with the lowest storage value, and writing the user information to be written into the cache space.

At this time, when the SIP server needs to write into the cache but the cache space is full, the procedure calculates the storage Value (Value) of each piece of user information in the current cache, and replaces one cache record with the lowest Value, thereby ensuring normal execution of the write operation and ensuring validity and accuracy of the data.

Wherein, different storage values can be set up for the local user data and the historical query data by adjusting parameters in the Value function.

It should be noted that, the embodiment of the present invention does not limit a specific Value function, and any Value function capable of effectively distinguishing the Value of user information in the prior art can be applied to the embodiment of the present invention.

Optionally, for the active update mode, the method further includes:

At this time, for the local user information, the SIP server and the locally registered user terminal maintain heartbeat detection, and the SIP terminal re-registers with the server at regular intervals (for example, set as a parameter TTL ₁). For the historical query information, the SIP server sets a life cycle (e.g., set as parameter TTL ₂) for the historical query content, and the SIP server re-queries the historical user information and updates it at intervals. Thereby ensuring the accuracy of the local cache data of the SIP server.

In the embodiment of the invention, the update of the cache content of the sink node is triggered by the SIP server, and after the SIP server updates, the new cache content is sent to the sink node.

The above describes the procedure of the first base station performing the call request processing as the base station where the call terminal is located, and it is of course possible that the first base station also co-processes the call request as the base station where the called terminal is located, in which case, optionally, the step 101 includes:

Step 1014: receiving a second call request message sent by a third base station through a satellite by a SIP server of the first base station;

step 1015: and sending the second call request message to the called fourth terminal.

At this time, when the calling terminal and the called terminal are not in the coverage area of the same base station, the third base station where the calling terminal is located sends the calling request message to the first base station where the called terminal is located through the satellite, and the first base station sends the calling request message to the called terminal after receiving the calling request message.

According to the network architecture provided by the invention, the SIP server is sunk from the network core to the network edge and deployed to each base station, the SIP message can be processed at the network edge, the user data flow can reach the SIP server without passing through the bearing network and the core network, the bandwidth pressure of satellite communication can be reduced, and low-delay high-capacity communication is realized.

As shown in fig. 10, the embodiment of the present invention further provides a star-to-ground convergence communication device 1000, which is applied to a first base station, where a session initiation protocol SIP server is deployed on the first base station, and the device includes:

a processing module 1001, configured to process, by using the SIP server of the first base station, a SIP message.

The star-to-ground convergence communication device 1000 provided by the invention sinks the SIP server from the network core to the network edge and deploys the SIP server to each base station, so that the SIP message can be processed at the network edge, the user data flow can reach the SIP server without passing through the bearing network and the core network, the bandwidth pressure of satellite communication can be reduced, and low-delay high-capacity communication is realized.

Optionally, the processing module 1001 includes:

A first receiving sub-module, configured to receive, through a SIP server of the first base station, a first call request message sent by a first terminal;

A first determining submodule, configured to determine, according to the first call request message, a base station where the called second terminal is located;

and the first forwarding sub-module is used for forwarding the first call request message according to the determined base station where the second terminal is located.

Optionally, the first transmitting sub-module includes:

A first sending unit, configured to send the first call request message to the second terminal when the base station where the second terminal is located is the first base station;

And the second sending unit is used for forwarding the first call request message to the second base station where the second terminal is located through a satellite under the condition that the base station where the second terminal is located is not the first base station, so that the second base station receives the first call request message and then sends the first call request message to the second terminal.

Optionally, the first determining submodule includes:

A first obtaining unit, configured to obtain address information of a second terminal that is called according to the first call request message;

And the first determining unit is used for determining the base station where the second terminal is located according to the address information of the second terminal.

Optionally, the first obtaining unit includes:

and the inquiring subunit is used for inquiring the address information of the called second terminal in the prestored user information according to the first call request message.

Optionally, the pre-stored user information includes:

Optionally, the pre-stored user information further includes:

Optionally, the query subunit is specifically configured to:

Optionally, the apparatus further comprises;

the selecting module is used for selecting a node with the smallest communication time delay with the SIP server of the first base station from different storage nodes as an aggregation node;

And the binding module is used for binding the SIP server of the first base station with the sink node.

Optionally, the apparatus further includes:

a first updating module, configured to send a re-registration request to a locally registered user terminal through a SIP server of the first base station at intervals of a first predetermined period; and/or

And the second updating module is used for updating the historical user information every a second preset period through the SIP server of the first base station.

Optionally, the apparatus further includes:

The first receiving module is used for receiving a user information change request sent by the third terminal; the user information change request comprises a registration request, an update request or a logout request;

the first changing module is used for writing or deleting the user information of the third terminal in the buffer space of the SIP server of the first base station according to the user information changing request;

and the first sending module is used for sending the user information change request to the sink node, so that after the sink node receives the user information change request, the sink node writes or deletes the user information of the third terminal in the cache space of the sink node, and sends the user information change request to a corresponding storage node for storage or deletion.

Optionally, the apparatus further includes:

a calculation module, configured to calculate a storage value of each piece of user information cached in a cache space when a SIP server of the first base station performs a write operation on the user information in the cache space and the cache space is full;

and the writing module is used for deleting the user information with the lowest storage value and writing the user information to be written into the cache space.

Optionally, the processing module 1001 includes:

a second receiving sub-module, configured to receive, through a SIP server of the first base station, a second call request message sent by a third base station through a satellite;

And the second forwarding sub-module is used for sending the second call request message to the called fourth terminal.

The implementation embodiments of the satellite-ground fusion communication method are applicable to the embodiments of the satellite-ground fusion communication device, and the same technical effects can be achieved.

The embodiment of the invention also provides a base station, which comprises a memory, a processor and a program which is stored in the memory and can run on the processor; and when the processor executes the program, the satellite-ground fusion communication method described in the embodiment is realized.

The implementation embodiments of the satellite-ground fusion communication method are applicable to the base station embodiment, and the same technical effects can be achieved.

The embodiment of the invention also provides a readable storage medium, on which a program is stored, which when executed by a processor, implements the steps in the star-to-ground fusion communication method described in the above embodiment.

The implementation embodiments of the satellite-ground fusion communication method are applicable to the embodiments of the network equipment, and the same technical effects can be achieved.

As shown in fig. 11, the embodiment of the present invention further provides a satellite-ground fusion communication method, which is applied to a terminal, and the method includes:

Step 1101: and sending a first call request message to a SIP server of the first base station, so that the SIP service of the first base station receives and forwards the first call request message.

According to the satellite-ground convergence communication method, the SIP server is sunk from the network core to the network edge and deployed to each base station, the call request message sent to the base station by the terminal can be processed at the network edge, the user data stream can reach the SIP server without passing through the bearing network and the core network, the bandwidth pressure of satellite communication can be reduced, and low-delay high-capacity communication is realized.

Optionally, the method further comprises:

At this time, for the local user information, the SIP server and the locally registered user terminal maintain heartbeat detection, and the SIP terminal re-registers with the server at regular intervals (for example, set as a parameter TTL ₁), so as to ensure the accuracy of locally cached data of the SIP server.

Optionally, the method further comprises:

At this time, when the user terminal performs registration, cancellation or position change, the user terminal actively transmits a corresponding request to the SIP server, and the SIP server changes the corresponding user information. The SIP server firstly performs corresponding writing or deleting operation in a local cache space according to the user information change request. If the user information changing request is a registration request or an update request, the SIP server firstly performs a writing operation on the corresponding user information in the local cache space, and if the user information changing request is a cancellation request, the SIP server firstly performs a deleting operation on the corresponding user information in the local cache space. After the local cache of the SIP server is updated, the SIP server sends a user information change request to the sink node, and the sink node performs corresponding writing or deleting operation in the cache space according to the user information change request. And then the convergence node sends the user information change request to the DHT storage node for storage or deletion. The sink node may determine the storage node of the user information according to the Hash value, the copy number, and the like of the user information, but is not limited thereto.

Optionally, the method further comprises:

As shown in fig. 12, a star-to-ground fusion communication device 1200 provided by an embodiment of the present invention is applied to a terminal, and the device includes:

a second sending module 1201 is configured to send a first call request message to a SIP server of a first base station, so that a SIP service of the first base station receives and forwards the first call request message.

The star-to-ground convergence communication device 1100 provided by the invention sinks the SIP server from the network core to the network edge, deploys the SIP server to each base station, and the call request message sent to the base station by the terminal can be processed at the network edge, so that the user data stream can reach the SIP server without passing through the bearing network and the core network, thereby reducing the bandwidth pressure of satellite communication and realizing low-delay high-capacity communication.

Optionally, the apparatus further includes:

and the third sending module is used for resending the registration request to the SIP server of the first base station at intervals of a first preset period.

Optionally, the apparatus further includes:

A fourth sending module, configured to send a user information change request to a SIP server of the first base station; the SIP server of the first base station writes or deletes the user information of the third terminal in the buffer space of the SIP server of the first base station according to the user information changing request, and the SIP server of the first base station sends the user information changing request to the sink node, so that after receiving the user information changing request, the sink node writes or deletes the user information of the third terminal in the buffer space of the sink node, and sends the user information changing request to a corresponding storage node for storage or deletion; the user information change request includes a registration request, an update request, or a logout request.

Optionally, the apparatus further includes:

And the second receiving module is used for receiving a second call request message sent by the first base station, wherein the second call request message is sent to the first base station by a third base station through a satellite.

The star-to-ground convergence communication device 1200 provided by the invention sinks the SIP server from the network core to the network edge, deploys the SIP server to each base station, and the call request message sent to the base station by the terminal can be processed at the network edge, so that the user data stream can reach the SIP server without passing through the bearing network and the core network, thereby reducing the bandwidth pressure of satellite communication and realizing low-delay high-capacity communication.

The implementation embodiments of the above-mentioned method for communication with the star-earth fusion are applicable to the embodiments of the communication device with the star-earth fusion, and can achieve the same technical effects.

The embodiment of the invention also provides a terminal which comprises a memory, a processor and a program which is stored in the memory and can run on the processor; and when the processor executes the program, the satellite-ground fusion communication method described in the embodiment is realized.

The implementation embodiments of the satellite-ground fusion communication method are applicable to the embodiment of the terminal, and the same technical effects can be achieved.

The implementation embodiments of the above-mentioned star-ground fusion communication method are all applicable to the embodiment of the readable storage medium, and the same technical effects can be achieved.

It should be noted that many of the functional components described in this specification have been referred to as modules, in order to more particularly emphasize their implementation independence.

In an embodiment of the invention, the modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be organized as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices.

Where a module may be implemented in software, taking into account the level of existing hardware technology, a module may be implemented in software, and one skilled in the art may, without regard to cost, build corresponding hardware circuitry, including conventional Very Large Scale Integration (VLSI) circuits or gate arrays, and existing semiconductors such as logic chips, transistors, or other discrete components, to achieve the corresponding functions. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the principles of the present invention, and such modifications and changes should also be considered as being within the scope of the present invention.

Claims

1. The star-to-ground convergence communication method is characterized by being applied to a first base station, wherein a Session Initiation Protocol (SIP) server is deployed on the first base station, and the method comprises the following steps:

2. The star-to-ground convergence communication method of claim 1, wherein the step of processing the SIP message by the SIP server of the first base station comprises:

3. The star-to-ground convergence communication method as set forth in claim 2, wherein forwarding the first call request message according to the determined base station in which the second terminal is located comprises:

4. The star-to-ground convergence communication method as set forth in claim 2, wherein determining the base station where the second terminal to be called is located based on the first call request message comprises:

5. The star-to-ground convergence communication method of claim 4, wherein the step of acquiring address information of the second terminal to be called based on the first call request message comprises:

6. The star-to-ground fusion communication method according to claim 5, wherein the pre-stored user information comprises:

7. The star-to-ground fusion communication method of claim 6, wherein the pre-stored user information further comprises:

8. The star-to-ground fusion communication method of claim 7, wherein the first user backup information comprises: user information registered on the SIP server of the first base station, and historical user information queried by the SIP server of the first base station;

9. The star-to-ground convergence communication method of claim 7, wherein the step of inquiring address information of the called second terminal among the pre-stored user information according to the first call request message comprises:

10. The star-to-ground convergence communication method as set forth in claim 7, wherein, in accordance with the first call request message, before inquiring address information of the called second terminal in the pre-stored user information, the method further comprises;

Binding the SIP server of the first base station with the sink node.

11. A star-to-ground converged communication method according to any one of claims 7 to 10, wherein the storage node is a network node deployed simultaneously with a SIP server; or the storage node is a network node deployed independently of the SIP server.

12. The star-to-ground fusion communication method according to any one of claims 7 to 10, characterized in that the method further comprises:

13. The star-to-ground fusion communication method according to any one of claims 7 to 10, characterized in that the method further comprises:

14. The star-to-ground fusion communication method according to any one of claims 7 to 10, characterized in that the method further comprises:

15. The star-to-ground fusion communication method according to any one of claims 6 to 10, characterized in that the user information comprises: user registration information and user terminal information;

16. A star-to-ground convergence communication method as claimed in any one of claims 1 to 3, wherein the step of processing a SIP message by the SIP server of the first base station comprises:

And sending the second call request message to the called fourth terminal.

17. A star-to-ground converged communication device applied to a first base station, wherein a session initiation protocol SIP server is deployed on the first base station, the device comprising:

18. A base station comprising a memory, a processor and a program stored on the memory and executable on the processor; the method according to any one of claims 1 to 16, characterized in that the processor implements a star-to-ground fusion communication method when executing the program.

19. A readable storage medium having stored thereon a program, which when executed by a processor, implements the steps of the star-to-ground fusion communication method according to any of claims 1 to 16.

20. A star-to-ground converged network architecture, comprising:

21. The star-to-ground fusion network architecture of claim 20, further comprising:

22. The star-to-ground converged network architecture of claim 21, wherein the storage nodes are network nodes deployed concurrently with SIP servers; or the storage node is a network node deployed independently of the SIP server.

23. A star-to-ground fusion communication method, characterized in that it is applied to a terminal, the method comprising:

24. The star-to-ground fusion communication method of claim 23, further comprising:

25. The star-to-ground fusion communication method of claim 23 or 24, further comprising:

Sending a user information change request to a SIP server of the first base station; the SIP server of the first base station writes or deletes the user information of the third terminal in the buffer space of the SIP server of the first base station according to the user information changing request, and the SIP server of the first base station sends the user information changing request to the sink node, so that after the sink node receives the user information changing request, the sink node writes or deletes the user information of the third terminal in the buffer space of the sink node, and sends the user information changing request to a corresponding storage node for storage or deletion; the user information change request includes a registration request, an update request, or a logout request.

26. The star-to-ground fusion communication method of claim 23, further comprising:

27. A star-to-ground converged communication device, for use in a terminal, the device comprising:

28. A terminal comprising a memory, a processor and a program stored on the memory and executable on the processor; the method according to any one of claims 23 to 26, characterized in that the processor, when executing the program, implements a star-to-ground fusion communication method.

29. A readable storage medium having stored thereon a program, which when executed by a processor, implements the steps of the star-to-ground fusion communication method of any of claims 23 to 26.