CN114374423A - An autonomous detection method for abnormal network disconnection of satellite mobile communication services - Google Patents

Abstract

The invention discloses an autonomous detection method for abnormal network disconnection of satellite mobile communication services, which includes the dual verification mechanism of media flow detection and signaling query during MGW detection of whether the media content sent by the terminal to the core network is active during the call to determine the satellite The network connection status of the terminal. The beneficial effects of the invention are as follows: after the satellite terminal establishes a call on the 3G core network side, the core network does not start periodic signaling inquiry, thereby reducing the signaling interaction process after the call and the impact on the call quality; the core network MSC detects the The method of the media stream inactivity event controls the core network MGW to start detecting the media stream content, which can control the entire satellite terminal disconnection detection process; the dual detection mechanism of media and signaling is adopted to improve the detection accuracy of the satellite terminal's network status.

Description

An autonomous detection method for abnormal network disconnection of satellite mobile communication services

technical field

The invention relates to an autonomous detection method for network disconnection, in particular to an autonomous detection method for abnormal network disconnection of satellite mobile communication services, and belongs to the technical field of 3G fusion communication.

Background technique

During the call of the satellite mobile communication terminal, due to geographical environment reasons (through tunnels), weather, battery power consumption and other factors, the satellite terminal equipment may not be able to communicate with the satellite normally, and the on-hook signal of the satellite terminal may not be transmitted to the core network normally. MSC (Mobile Switching Center) equipment. In order to prevent the problem of over-long bills and hang up of calls and media resources, the 3G core network usually uses the method of signaling query to know the networking status of the satellite terminals.

The signaling query method is that the MSC searches for the status of the satellite terminal through the status query of NAS (Non-Access-Statum, non-access stratum) signaling. Due to the shortage of air interface resources, the signaling status query will temporarily use the call channel to affect the call quality. When a large number of terminals are talking online, the access network and core network side signaling resources are occupied by frequent signaling status queries, which affects the stability of the system.

For the existing disclosed application number: CN107332735A, a network communication method for automatic reconnection after disconnection, which solves the problem that when the communication between the terminal and the server is abnormal, the network operation cannot be detected in time when the automatic reconnection occurs. status issues;

For the existing disclosed application number: CN112996102A, a satellite terminal connection state management method, device, gateway device, fusion communication system and storage medium, which solve the problem of the fusion communication scene between the satellite communication system and the 5G core network. The problem of wasting network resources is prone to occur.

In addition, in the prior art, the networking status of the satellite terminal during the call phase is generally obtained by the method of signaling query in the prior art of the 3G core network. It is necessary to locate and send a query message to the satellite terminal to obtain the query result for confirmation. Due to the shortage of air interface resources , the query signaling will temporarily occupy the call channel and affect the call quality, and when the number of online call terminals is large, there are a large number of query messages between the 3G core network and the satellite terminals, increasing the burden on the satellite access network.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an autonomous detection method for abnormal network disconnection of satellite mobile communication services in order to solve the problem, without affecting the call quality of satellite terminal users, and reducing the signaling interaction process between the MSC and the satellite terminal during the call period, Reduce signaling pressure on access network and core network equipment. In addition, when making non-voice calls for special satellite users, it is not easy to misjudge a terminal that is normally connected to the network as a disconnected state, causing the core network to release the call in advance.

The present invention achieves the above objects through the following technical solutions: an autonomous detection method for abnormal network disconnection of satellite mobile communication services, comprising the following steps

Step 1, when the core network MSC sets up a call for the satellite terminal, instruct the core network MGW to detect the active state of the satellite terminal media stream sent from the access network in real time, and the core network MSC does not initiate a NAS signaling status query message to the satellite terminal;

Step 2: When the satellite terminal is normally connected to the access device through the satellite, the access network sends the media stream from the satellite terminal to the core network MGW in real time. The core network MSC reports the active state event of the terminal media stream;

Step 3: When the wireless signal between the satellite terminal and the satellite is abnormally disconnected from the network, the access network sends the media stream from the satellite terminal to the core network MGW in real time, and the core network MGW checks the voice data of the satellite terminal in real time and judges that the media stream is inactive. The core network MSC reports the inactive state event of the terminal media stream, and the core network MSC starts the process of querying the satellite terminal state by NAS signaling.

As a further solution of the present invention: in the step 1, the access network sends the media stream from the satellite terminal to the core network MGW in real time, including:

①When the satellite terminal is normally connected to the wireless signal of the satellite, and the satellite terminal transmits voice data to the core network, the access network sends the RTP packet to the core network MGW in real time. The payload in the RTP packet is the compressed data from the terminal. Voice data, the voice data changes in real time when the satellite user speaks, and the core network MGW judges it to be active;

②When the satellite terminal and the wireless signal of the satellite are connected to the network normally, and the satellite terminal transmits non-voice data to the core network, the access network sends the RTP packet to the core network MGW in real time. The payload in the RTP packet is the non-voice data from the terminal. Unlimited data, if the special data does not change in real time, the core network MGW continuously detects that the payload content of all received RTP packets is consistent within the specified time, and the core network MGW judges that the media stream is inactive;

③ When the wireless signal between the satellite terminal and the satellite is abnormally disconnected, the access network also sends an RTP packet to the core network MGW in real time. The payload in the RTP packet is the default data from the access network or all zero data. If it is detected continuously within the specified time that the voice contents of all received RTP packets are consistent and unchanged, the core network MGW judges that the media stream is inactive.

As a further scheme of the present invention: in the step 3, the MSC uses the NAS signaling to query the process of the satellite terminal status, including:

1. The core network MSC sends a status query message of NAS signaling to the satellite terminal, the core network MSC starts the query waiting timer, and the core network MSC judges in real time whether the timing of the query waiting timer exceeds the preset time length, and if it exceeds, the timing is terminated. device, the core network MSC judges whether the number of times of sending the NAS signaling status query message to the satellite terminal reaches the configured maximum value, and if it does not reach the maximum value, repeats sending the NAS signaling status query message to the satellite terminal, and restarts the waiting timer; If the maximum value is reached, it is judged that the satellite terminal is in a state of disconnection of the call;

2 If the core network MSC judges in real time that the waiting timer does not exceed the preset duration, and the core network MSC receives the NAS signaling status query response message from the satellite terminal, it terminates the waiting timer and judges that the satellite terminal is in a call-connected state. Hold the call.

As a further scheme of the present invention: the MSC judges that the satellite terminal is in a state of calling and connecting to the network, including:

The core network MSC starts the period detection timer, and the core network MSC judges in real time whether the timing of the query waiting timer exceeds the preset time period. In the active state of the media stream, the core network MSC no longer initiates a NAS signaling state inquiry message to the satellite terminal.

As a further solution of the present invention: when the satellite terminal is normally connected to the network, for the non-voice special media stream sent by the satellite terminal, the MGW may also detect that the media stream is in an inactive state, and start the NAS signaling query process through the MSC. The query method can detect that the satellite terminal is in the state of being connected to the network, and prevent the possibility of misjudgment by the core network.

As a further scheme of the present invention: the MSC judges that the satellite terminal is in a call disconnection state, including:

The core network MSC starts the call release process, releases the call signaling to the access network, and releases the media processing resources to the MGW.

As a further scheme of the present invention: after the call is established, the MSC does not use the NAS signaling to query the network connection state of the satellite terminal, and first specifies whether the 3G core network MGW equipment detects in real time whether the media stream sent by the satellite terminal to the core network is in a normal call state, After detecting that the media stream of the satellite terminal is inactive, the MGW notifies the MSC to start the NAS signaling query process, and the MSC finally determines whether the satellite terminal is really disconnected from the network through the NAS signaling query process. During the period when the MGW detects that the media stream is in an active state, there is no additional signaling interaction process between the MSC and the satellite terminal, which does not affect the call quality and increase the system signaling interaction burden.

The beneficial effects of the present invention are:

1. After the satellite terminal establishes a call on the 3G core network side, the core network does not start periodic signaling queries, which reduces the signaling interaction process after the call and the impact on the call quality; Influence of call quality: The signaling interaction that uses signaling to query the terminal status during the call also occupies wireless channel resources, which will affect the call quality; this network disconnection detection method adopts the sequential steps of first detecting media anomalies and then initiating signaling query. , which can significantly reduce the signaling interaction traffic during the call;

2. The core network MSC controls the core network MGW to start detecting the content of the media stream by detecting the inactive event of the media stream, and can control the whole network disconnection detection process of the satellite terminal; the accuracy is improved: the network disconnection detection method adopts the media stream and The mechanism of signaling joint verification first detects whether the media stream is normal and has communication content in real time. If the media stream is abnormal, further detection is performed through signaling to confirm whether the terminal is really disconnected from the network. In some business scenarios, such as special encrypted data transmission, the communication data of the media stream may not change for a period of time, and the media stream detection alone may cause false detection.

3. The dual detection mechanism of media and signaling is adopted to improve the detection accuracy of the network connection status of the satellite terminal.

Description of drawings

FIG. 1 is a schematic diagram of the detection and interaction of disconnection of a call according to the present invention;

Fig. 2 is the detection interaction schematic diagram of the present invention transmitting non-voice data;

FIG. 3 is a schematic flow chart of the network state detection of the satellite terminal according to the present invention;

FIG. 4 is a schematic diagram of a flow chart for detecting a media activity state of a satellite terminal according to the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

Referring to Figure 1, a method for autonomous detection of abnormal network disconnection of a satellite mobile communication service includes the following steps

Step 1, when the core network MSC sets up a call for the satellite terminal, instruct the core network MGW to detect the active state of the satellite terminal media stream sent from the access network in real time, and the core network MSC does not initiate a NAS signaling status query message to the satellite terminal;

Step 2: When the satellite terminal is normally connected to the access device through the satellite, the access network sends the media stream from the satellite terminal to the core network MGW in real time. The core network MSC reports the active state event of the terminal media stream;

Step 3: When the wireless signal between the satellite terminal and the satellite is abnormally disconnected from the network, the access network sends the media stream from the satellite terminal to the core network MGW in real time, and the core network MGW checks the voice data of the satellite terminal in real time and judges that the media stream is inactive. The core network MSC reports the inactive state event of the terminal media stream, and the core network MSC starts the process of querying the satellite terminal state by NAS signaling.

In the embodiment of the present invention, in the first step, the access network sends the media stream from the satellite terminal to the core network MGW in real time, including:

①When the satellite terminal is normally connected to the wireless signal of the satellite, and the satellite terminal transmits voice data to the core network, the access network sends the RTP packet to the core network MGW in real time. The payload in the RTP packet is the compressed data from the terminal. Voice data, the voice data changes in real time when the satellite user speaks, and the core network MGW judges it to be active;

②When the satellite terminal and the wireless signal of the satellite are connected to the network normally, and the satellite terminal transmits non-voice data to the core network, the access network sends the RTP packet to the core network MGW in real time. The payload in the RTP packet is the non-voice data from the terminal. Unlimited data, if the special data does not change in real time, the core network MGW continuously detects that the payload content of all received RTP packets is consistent within the specified time, and the core network MGW judges that the media stream is inactive;

③ When the wireless signal between the satellite terminal and the satellite is abnormally disconnected, the access network also sends an RTP packet to the core network MGW in real time. The payload in the RTP packet is the default data from the access network or all zero data. If it is detected continuously within the specified time that the voice contents of all received RTP packets are consistent and unchanged, the core network MGW judges that the media stream is inactive.

In the embodiment of the present invention, in the step 3, the process that the MSC uses the NAS signaling to query the status of the satellite terminal, including:

1. The core network MSC sends a status query message of NAS signaling to the satellite terminal, the core network MSC starts the query waiting timer, and the core network MSC judges in real time whether the timing of the query waiting timer exceeds the preset time length, and if it exceeds, the timing is terminated. device, the core network MSC judges whether the number of times of sending the NAS signaling status query message to the satellite terminal reaches the configured maximum value, and if it does not reach the maximum value, repeats sending the NAS signaling status query message to the satellite terminal, and restarts the waiting timer; If the maximum value is reached, it is judged that the satellite terminal is in a state of disconnection of the call;

2 If the core network MSC judges in real time that the waiting timer does not exceed the preset duration, and the core network MSC receives the NAS signaling status query response message from the satellite terminal, it terminates the waiting timer and judges that the satellite terminal is in a call-connected state. Hold the call.

In the embodiment of the present invention, the MSC determines that the satellite terminal is in the state of being connected to the network, including:

The core network MSC starts the period detection timer, and the core network MSC judges in real time whether the timing of the query waiting timer exceeds the preset time period. In the active state of the media stream, the core network MSC no longer initiates a NAS signaling state inquiry message to the satellite terminal.

In the embodiment of the present invention, when the satellite terminal is normally connected to the network, for the non-voice special media stream sent by the satellite terminal, the MGW may also detect that the media stream is in an inactive state, and start the NAS signaling query process through the MSC. The query method can detect that the satellite terminal is in the state of being connected to the network, preventing the possibility of misjudgment by the core network.

In the embodiment of the present invention, the MSC judges that the satellite terminal is in a state of disconnection of calls, including:

The core network MSC starts the call release process, releases the call signaling to the access network, and releases the media processing resources to the MGW.

In the embodiment of the present invention, after the call is established, the MSC does not use the NAS signaling to query the network connection status of the satellite terminal, but first specifies the 3G core network MGW device to detect in real time whether the media stream sent from the satellite terminal to the core network is in a normal call status. After detecting that the media stream of the satellite terminal is in an inactive state, the MSC is notified to start the NAS signaling query process, and the MSC finally determines whether the satellite terminal is really disconnected from the network through the NAS signaling query process. During the period when the MGW detects that the media stream is in an active state, there is no additional signaling interaction process between the MSC and the satellite terminal, which does not affect the call quality and increase the system signaling interaction burden.

Embodiment 2

Please refer to FIGS. 2 to 4 , an autonomous detection method for abnormal network disconnection of a satellite mobile communication service. In this embodiment, when a satellite terminal calls for a long time and transmits non-voice data, the method for preventing erroneous detection of 3G core network MGW&MSC equipment may be, but not limited to The following steps S201-S206 are included.

S201. The satellite terminal establishes a call on the 3G core network side and enters a conversation.

In step S201, the satellite terminal is a conventional user equipment in the satellite communication system, establishes a call with the MSC of the 3G core network and other satellite terminals through the access network equipment, and establishes a media connection with the MGW of the 3G core network through the access network equipment , the media streams between the satellite terminal and other satellite terminals are forwarded to each other through the MGW.

S202. The MSC sends an event of detecting the terminal media stream inactivity to the MGW.

In step S201, the core network MSC equipment requests the core network MGW equipment to detect the terminal media stream inactivity event, and extends the H.248 standard Modify message to transmit the terminal media stream inactivity detection event.

S203. The satellite terminal is normally connected to the satellite communication system, and the MGW detects that the media stream from the satellite terminal is inactive.

In step S203, the access network device sends the media stream of the RTP packet to the core network MGW device in real time. The Payload of each RTP packet carries the non-voice unlimited content data from the terminal, which exists in a configurable time period. The payloads of different RTP packets are the same data, and the MGW detects that the media stream of the satellite terminal is in an inactive state according to the process method provided in Figure 4.

S204. The MGW reports the terminal media stream inactivity event to the MSC.

In step S204, the core network MGW device reports to the core network MSC device that the terminal media stream inactivity event is detected, and extends the Notify message of the H.248 standard to transmit the terminal media stream inactivity event.

S205. The MSC sends a status query request message of the NAS to the satellite terminal.

In step S205, after receiving the terminal media stream inactivity event from the core network device MGW, the core network MSC device searches for the SCCP connection according to the call context established for the satellite terminal, and sends the NAS status query to the satellite terminal based on the SCCP connection message, and then start a waiting timer to wait for the NAS status reply message from the satellite terminal. The satellite terminal and the satellite communication system are normally connected to the network, and the satellite terminal receives the NAS status request message sent by the core network MSC.

S206. The MSC receives the status response message of the NAS sent by the satellite terminal.

In step S206, the satellite terminal sends a NAS status response message to the core network MSC device. After receiving the message, the core network MSC device confirms that the satellite terminal is still in a normal networking state, and starts a period detection timer. The timer timeout period is greater than 15 minute.

S207. The MSC repeatedly starts the next round of satellite terminal state detection process.

In step S207, after the period detection timer started by the core network MSC device times out, it jumps to step S201.

Therefore, based on the method for preventing the 3G core network MGW&MSC equipment from erroneously detecting when the satellite terminal is talking for a long time and transmitting non-voice data described in the aforementioned steps S201-S208, in step S203, the core network MGW equipment may detect that the satellite terminal media stream is non-voice data. In the active state, the core network equipment MSC further inquires the state of the satellite terminal through signaling, so as not to cause misjudgment of the network connection state of the satellite terminal.

Working principle: During the call, the MGW detects whether the media content sent by the terminal to the core network is active, so as to preliminarily determine the network connection status of the satellite terminal, and adopts the dual-check mechanism of media stream detection and signaling query to determine the network connection of the satellite terminal. status, to obtain the network status of the satellite terminal more accurately. For the special data that the satellite terminal sends abnormal voice during the call, sometimes the same media payload data may be continuously sent, causing the MGW to initially misjudge that the satellite terminal is in a disconnected state, and then start the MSC to query the status of the satellite terminal through signaling for further confirmation .

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (7)

1. a kind of autonomous detection method of abnormal disconnection of satellite mobile communication service, it is characterized in that: comprise the following steps Step 1, when the core network MSC sets up a call for the satellite terminal, instruct the core network MGW to detect the active state of the satellite terminal media stream sent from the access network in real time, and the core network MSC does not initiate a NAS signaling status query message to the satellite terminal; Step 2: When the satellite terminal is normally connected to the access device through the satellite, the access network sends the media stream from the satellite terminal to the core network MGW in real time. The core network MSC reports the active state event of the terminal media stream; Step 3: When the wireless signal between the satellite terminal and the satellite is abnormally disconnected from the network, the access network sends the media stream from the satellite terminal to the core network MGW in real time, and the core network MGW checks the voice data of the satellite terminal in real time and judges that the media stream is inactive. The core network MSC reports the inactive state event of the terminal media stream, and the core network MSC starts the process of querying the satellite terminal state by NAS signaling. 2. The method for autonomous detection of abnormal network disconnection of a satellite mobile communication service according to claim 1, wherein: in the step 1, the access network sends the media stream from the satellite terminal to the core network MGW in real time, including : ①When the satellite terminal is normally connected to the wireless signal of the satellite, and the satellite terminal transmits voice data to the core network, the access network sends the RTP packet to the core network MGW in real time. The payload in the RTP packet is the compressed data from the terminal. Voice data, the voice data changes in real time when the satellite user speaks, and the core network MGW judges it to be active; ②When the satellite terminal and the wireless signal of the satellite are connected to the network normally, and the satellite terminal transmits non-voice data to the core network, the access network sends the RTP packet to the core network MGW in real time. The payload in the RTP packet is the non-voice data from the terminal. Unlimited data, if the special data does not change in real time, the core network MGW continuously detects that the payload content of all received RTP packets is consistent within the specified time, and the core network MGW judges that the media stream is inactive; ③ When the wireless signal between the satellite terminal and the satellite is abnormally disconnected, the access network also sends an RTP packet to the core network MGW in real time. The payload in the RTP packet is the default data from the access network or all zero data. If it is detected continuously within the specified time that the voice contents of all received RTP packets are consistent and unchanged, the core network MGW judges that the media stream is inactive. 3. the autonomous detection method of a kind of satellite mobile communication service abnormal disconnection according to claim 1, is characterized in that: in described step 3, MSC uses NAS signaling to query the process of satellite terminal state, comprising: 1. The core network MSC sends a status query message of NAS signaling to the satellite terminal, the core network MSC starts the query waiting timer, and the core network MSC judges in real time whether the timing of the query waiting timer exceeds the preset time length, and if it exceeds, the timing is terminated. device, the core network MSC judges whether the number of times of sending the NAS signaling status query message to the satellite terminal reaches the configured maximum value, and if it does not reach the maximum value, repeats sending the NAS signaling status query message to the satellite terminal, and restarts the waiting timer; If the maximum value is reached, it is judged that the satellite terminal is in a state of disconnection of the call; 2 If the core network MSC judges in real time that the waiting timer does not exceed the preset duration, and the core network MSC receives the NAS signaling status query response message from the satellite terminal, it terminates the waiting timer and judges that the satellite terminal is in a call-connected state. Hold the call. 4. the autonomous detection method of a kind of satellite mobile communication service abnormally disconnected network according to claim 3, it is characterized in that: MSC judges that satellite terminal is in the state of calling and networking, comprising: The core network MSC starts the period detection timer, and the core network MSC judges in real time whether the timing of the query waiting timer exceeds the preset time period. In the active state of the media stream, the core network MSC no longer initiates a NAS signaling state inquiry message to the satellite terminal. 5. the autonomous detection method of a kind of satellite mobile communication service abnormal disconnection according to claim 4, it is characterized in that: when satellite terminal is normally connected to the network, for the non-voice special media stream that satellite terminal sends, MGW may also detect The media stream is in an inactive state. After the MSC starts the NAS signaling query process, it can be detected that the satellite terminal is in a call-connected state through the signaling query method. 6. the autonomous detection method of a kind of satellite mobile communication service abnormal disconnection according to claim 3, it is characterized in that: MSC judges that satellite terminal is in the state of call disconnection, comprising: The core network MSC starts the call release process, releases the call signaling to the access network, and releases the media processing resources to the MGW. 7. the autonomous detection method of a kind of satellite mobile communication service abnormally disconnected network according to claim 6, it is characterized in that: MSC does not use NAS signaling to inquire about the network connection state of satellite terminal first after the call is established to talk, first specifies 3G core The network MGW device detects in real time whether the media stream sent from the satellite terminal to the core network is in a normal calling state. After detecting that the media stream of the satellite terminal is inactive, the MGW notifies the MSC to start the NAS signaling query process, and the MSC goes through the NAS signaling query process to finally To judge whether the satellite terminal is really disconnected from the network.

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