CN114374423B - Autonomous detection method for abnormal network disconnection of satellite mobile communication service - Google Patents
Autonomous detection method for abnormal network disconnection of satellite mobile communication service Download PDFInfo
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- 230000011664 signaling Effects 0.000 claims abstract description 72
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18569—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance
- H04B7/18573—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance for operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18558—Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations
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Abstract
The invention discloses an autonomous detection method for abnormal network disconnection of satellite mobile communication service, which comprises the steps of determining the networking state of a satellite terminal by a double check mechanism of whether media content sent to a core network by the terminal is active or not, media stream detection and signaling inquiry during the conversation period detected by an MGW. 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, so that the signaling interaction process after the call and the influence on the call quality are reduced; the core network MSC controls the core network MGW to start to detect the media stream content by a method for detecting the media stream inactivity event, and can control the network disconnection detection process of the whole satellite terminal; and the detection accuracy of the networking state of the satellite terminal is improved by adopting a media and signaling dual detection mechanism.
Description
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 service, and belongs to the technical field of 3G converged communication.
Background
During the communication of the satellite Mobile communication terminal, due to factors such as geographical location, environmental reasons (passing through a tunnel), weather, and consumption of battery, the satellite terminal device cannot normally communicate with the satellite, and the on-hook signal of the satellite terminal cannot normally be transmitted to the MSC (Mobile SWITCHING CENTER) device of the core network. In order to prevent the problems of the overlength ticket and the hanging of the call and media resources, the 3G core network generally adopts a signaling query method to know the networking state of the satellite terminal.
The method for inquiring the signaling is that the MSC inquires and searches the state of the satellite terminal through the state of NAS (Non-Access-Statum) signaling. Because of the shortage of air interface resources, the signaling state inquiry can temporarily use the communication channel to influence the communication quality, and the frequent signaling state inquiry occupies the signaling resources at the access network and the core network side to influence the stability of the system when a large number of terminals communicate online.
For the existing published application No.: the network communication method of CN107332735A after disconnection, which solves the problem that the operation state of the network can not be detected in time when the terminal is automatically reconnected when the communication between the terminal and the server is abnormal;
For the existing published application No.: a satellite terminal connection state management method, a device, gateway equipment, a converged communication system and a storage medium of CN112996102A solve the problem of network resource waste which easily occurs in a converged communication scene of a satellite communication system and a 5G core network.
In addition, in the prior art, the networking state of the satellite terminal in the call stage is generally obtained by adopting a signaling query method, and the 3G core network prior art needs to locate and send a query message to the satellite terminal to obtain a query result for confirmation.
Disclosure of Invention
The invention aims to solve the problem and provide an autonomous detection method for abnormal network disconnection of satellite mobile communication service, which does not influence the call quality of satellite terminal users, reduces the signaling interaction process between MSC and satellite terminal in the call period and lightens the signaling pressure of access network and core network equipment. And when the special satellite user is subjected to non-voice call, the normally connected terminal is not easy to be misjudged as a network state, so that the core network releases the call in advance.
The invention realizes the above purpose through the following technical scheme: an autonomous detection method for abnormal network disconnection of satellite mobile communication service comprises the following steps
When a core network MSC establishes a call for a satellite terminal, indicating a core network MGW to detect the active state of a satellite terminal media stream sent from an access network in real time, wherein the core network MSC does not initiate NAS signaling state query information to the satellite terminal;
When the satellite terminal is normally networked with the access equipment through the satellite, the access network transmits media streams from the satellite terminal to the core network MGW in real time, and the core network MGW checks voice data of the satellite terminal in real time and judges that the media streams are active, and does not report active state events of the terminal media streams to the core network MSC;
Step three, when the satellite terminal and the wireless signal of the satellite are abnormally disconnected, the access network sends the media stream from the satellite terminal to the core network MGW in real time, the core network MGW checks the voice data of the satellite terminal in real time and judges that the media stream is inactive, an inactive state event of the terminal media stream is reported to the core network MSC, and the core network MSC starts a process of inquiring the state of the satellite terminal by using NAS signaling.
As still further aspects of the invention: in the first step, the access network sends media stream from the satellite terminal to the core network MGW in real time, including:
① When a satellite terminal and a wireless signal of a satellite are normally connected and the satellite terminal transmits voice data to a core network, an access network transmits RTP packets to the core network MGW in real time, payload in the RTP packets is compressed voice data from the terminal, the voice data changes in real time when a satellite user speaks, and the core network MGW judges that the voice data is active;
② When a satellite terminal and a wireless signal of a satellite are normally connected and the satellite terminal transmits non-voice data to a core network, an access network transmits RTP packets to a core network MGW in real time, the Payload in the RTP packets is non-voice unlimited data from the terminal, if the special data is not real-time change, the core network MGW continuously detects that the load content of all received RTP packets is consistent and unchanged in a designated time, and the core network MGW judges that a media stream is inactive;
③ When the satellite terminal and the wireless signal of the satellite are abnormally disconnected, the access network also transmits RTP packets to the core network MGW in real time, the Payload in the RTP packets is default data or all zero data from the access network, the core network MGW continuously detects that the voice content of all received RTP packets is consistent and unchanged in a specified time, and the core network MGW judges that the media stream is inactive.
As still further aspects of the invention: in the third step, the process of querying the satellite terminal state by the MSC through NAS signaling comprises the following steps:
① The core network MSC sends state inquiry information of NAS signaling to the satellite terminal, the core network MSC starts an inquiry waiting timer, the core network MSC judges whether the timing of the inquiry waiting timer exceeds a preset duration in real time, if yes, the timer is terminated, the core network MSC judges whether the number of times of sending the state inquiry information of the NAS signaling to the satellite terminal reaches a configuration maximum value, if not, the state inquiry information of the NAS signaling is repeatedly sent to the satellite terminal, and the waiting timer is restarted; if the maximum value is reached, judging that the satellite terminal is in a call disconnection state;
② If the core network MSC judges in real time that the timing of the waiting timer does not exceed the preset duration, the core network MSC receives the state inquiry response message of the NAS signaling of the satellite terminal, the waiting timer is terminated, the satellite terminal is judged to be in a call networking state, and the call is kept.
As still further aspects of the invention: MSC judges that satellite terminal is in call networking state, including:
The core network MSC starts a period detection timer, the core network MSC judges whether the timing of the inquiry waiting timer exceeds the preset duration in real time, if so, the timer is terminated, and the MGW is instructed to detect the active state of the satellite terminal media stream sent by the access network in real time, and the core network MSC does not initiate NAS signaling state inquiry information to the satellite terminal.
As still further aspects of the invention: when the satellite terminal is normally connected, the MGW may also detect that the media stream is inactive for the non-voice special media stream sent by the satellite terminal, start the NAS signaling query process through the MSC, and detect that the satellite terminal is in a call connection state through the signaling query method, so as to prevent the possibility of misjudgment of the core network.
As still further aspects of the invention: MSC judges that satellite terminal is in a call disconnection state, including:
The core network MSC initiates a call release procedure, releasing call signaling to the access network and media processing resources to the MGW.
As still further aspects of the invention: after call establishment, MSC does not use NAS signaling to inquire the network connection state of the satellite terminal, firstly, the 3G core network MGW equipment is specified to detect whether the media stream sent by the satellite terminal to the core network is in a normal call state or not in real time, after the MGW detects that the media stream of the satellite terminal is in an inactive state, the MSC is informed to start the NAS signaling inquiry process, and finally, whether the satellite terminal is really disconnected or not is judged by the MSC through the NAS signaling inquiry process. During the period that the MGW detects that the media stream is in an active state, no additional signaling interaction process between the MSC and the satellite terminal exists, so that the conversation quality is not affected, and the signaling interaction burden of a system is not increased.
The beneficial effects of the invention are as follows:
1. After the satellite terminal establishes a call on the 3G core network side, the core network does not start periodic signaling inquiry, so that the signaling interaction process after the call and the influence on the call quality are reduced; the frequency of signaling detection is reduced, and the influence on the call quality is reduced: signaling interaction for inquiring the state of the terminal by signaling is also used for occupying wireless channel resources in the conversation process, so that conversation quality can be influenced; the network disconnection detection method adopts the sequential steps of firstly detecting media abnormality and then starting signaling inquiry, so that signaling interaction flow in the conversation process can be obviously reduced;
2. The core network MSC controls the core network MGW to start to detect the media stream content by a method for detecting the media stream inactivity event, and can control the network disconnection detection process of the whole satellite terminal; improvement of accuracy: the network disconnection detection method adopts a mechanism of checking media stream and signaling together, firstly detects whether the media stream normally has communication content in real time, and further detects and confirms whether the terminal is truly disconnected through signaling if the media stream is abnormal. Some service scenarios, such as special encrypted data transmission, may exist that communication data of a media stream does not change within a period of time, and a situation that a media stream is used alone for detection may exist in false detection.
3. And the detection accuracy of the networking state of the satellite terminal is improved by adopting a media and signaling dual detection mechanism.
Drawings
FIG. 1 is a schematic diagram of a detection interaction of a call outage in accordance with the present invention;
FIG. 2 is a schematic diagram of a detection interaction for transferring non-voice data according to the present invention;
FIG. 3 is a schematic diagram of a satellite terminal networking state detection flow according to the present invention;
fig. 4 is a schematic diagram of a satellite terminal media activity status detection process according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, an autonomous detection method for abnormal network disconnection of satellite mobile communication service includes the following steps
When a core network MSC establishes a call for a satellite terminal, indicating a core network MGW to detect the active state of a satellite terminal media stream sent from an access network in real time, wherein the core network MSC does not initiate NAS signaling state query information to the satellite terminal;
When the satellite terminal is normally networked with the access equipment through the satellite, the access network transmits media streams from the satellite terminal to the core network MGW in real time, and the core network MGW checks voice data of the satellite terminal in real time and judges that the media streams are active, and does not report active state events of the terminal media streams to the core network MSC;
Step three, when the satellite terminal and the wireless signal of the satellite are abnormally disconnected, the access network sends the media stream from the satellite terminal to the core network MGW in real time, the core network MGW checks the voice data of the satellite terminal in real time and judges that the media stream is inactive, an inactive state event of the terminal media stream is reported to the core network MSC, and the core network MSC starts a process of inquiring the state of the satellite terminal by using NAS signaling.
In the embodiment of the present invention, in the step one, the sending, by the access network, the media stream from the satellite terminal to the core network MGW in real time includes:
① When a satellite terminal and a wireless signal of a satellite are normally connected and the satellite terminal transmits voice data to a core network, an access network transmits RTP packets to the core network MGW in real time, payload in the RTP packets is compressed voice data from the terminal, the voice data changes in real time when a satellite user speaks, and the core network MGW judges that the voice data is active;
② When a satellite terminal and a wireless signal of a satellite are normally connected and the satellite terminal transmits non-voice data to a core network, an access network transmits RTP packets to a core network MGW in real time, the Payload in the RTP packets is non-voice unlimited data from the terminal, if the special data is not real-time change, the core network MGW continuously detects that the load content of all received RTP packets is consistent and unchanged in a designated time, and the core network MGW judges that a media stream is inactive;
③ When the satellite terminal and the wireless signal of the satellite are abnormally disconnected, the access network also transmits RTP packets to the core network MGW in real time, the Payload in the RTP packets is default data or all zero data from the access network, the core network MGW continuously detects that the voice content of all received RTP packets is consistent and unchanged in a specified time, and the core network MGW judges that the media stream is inactive.
In the third step, the process of querying the satellite terminal state by the MSC using NAS signaling includes:
① The core network MSC sends state inquiry information of NAS signaling to the satellite terminal, the core network MSC starts an inquiry waiting timer, the core network MSC judges whether the timing of the inquiry waiting timer exceeds a preset duration in real time, if yes, the timer is terminated, the core network MSC judges whether the number of times of sending the state inquiry information of the NAS signaling to the satellite terminal reaches a configuration maximum value, if not, the state inquiry information of the NAS signaling is repeatedly sent to the satellite terminal, and the waiting timer is restarted; if the maximum value is reached, judging that the satellite terminal is in a call disconnection state;
② If the core network MSC judges in real time that the timing of the waiting timer does not exceed the preset duration, the core network MSC receives the state inquiry response message of the NAS signaling of the satellite terminal, the waiting timer is terminated, the satellite terminal is judged to be in a call networking state, and the call is kept.
In the embodiment of the invention, the MSC judges that the satellite terminal is in a call networking state, and comprises the following steps:
The core network MSC starts a period detection timer, the core network MSC judges whether the timing of the inquiry waiting timer exceeds the preset duration in real time, if so, the timer is terminated, and the MGW is instructed to detect the active state of the satellite terminal media stream sent by the access network in real time, and the core network MSC does not initiate NAS signaling state inquiry information to the satellite terminal.
In the embodiment of the invention, when the satellite terminal is normally connected, the MGW can also detect that the media stream is in an inactive state for the non-voice special media stream sent by the satellite terminal, and start the NAS signaling query process through the MSC, and detect that the satellite terminal is in a call networking state through the signaling query method, thereby preventing the possibility of misjudgment of a core network.
In the embodiment of the invention, the MSC judges that the satellite terminal is in a call disconnection state, and comprises the following steps:
The core network MSC initiates a call release procedure, releasing call signaling to the access network and media processing resources to the MGW.
In the embodiment of the invention, after the call is established, MSC does not inquire the network connection state of the satellite terminal by NAS signaling, firstly, the 3G core network MGW equipment is specified to detect whether the media stream sent by the satellite terminal to the core network is in a normal call state or not in real time, and after the MGW detects that the media stream of the satellite terminal is in an inactive state, the MSC is informed to start the NAS signaling inquiry process, and finally, the MSC judges whether the satellite terminal is really disconnected or not by the NAS signaling inquiry process. During the period that the MGW detects that the media stream is in an active state, no additional signaling interaction process between the MSC and the satellite terminal exists, so that the conversation quality is not affected, and the signaling interaction burden of a system is not increased.
Example two
Referring to fig. 2 to 4, a method for preventing error detection of a 3G core network MGW & MSC device when a satellite terminal in this embodiment transmits non-voice data in a long-time call may include, but is not limited to, the following steps S201 to S206.
S201, the satellite terminal establishes a call entering conversation at the 3G core network side.
In step S201, the satellite terminal is a conventional user equipment in the satellite communication system, a call is established with other satellite terminals through an MSC of the access network device and the 3G core network, a media connection is established with an MGW of the 3G core network through the access network device, and media streams between the satellite terminal and other satellite terminals are forwarded to each other through the MGW.
And S202, the MSC issues and detects the terminal media stream inactivity event to the MGW.
In step S201, the core network MSC device requests to the core network MGW device to detect a terminal media stream inactivity event, and extends the modification message of the h.248 standard to deliver the event for detecting the terminal media stream inactivity.
S203, the satellite terminal and a satellite communication system are normally networked, and the MGW detects that the media stream from the satellite terminal is inactive.
In step S203, the access network device sends media streams of RTP packets to the core network MGW device in real time, and the Payload load of each RTP packet carries data of non-voice unrestricted content from the terminal, where different Payload loads of RTP packets are the same data in a configurable time period, and the MGW detects that the satellite terminal media stream is in an inactive state according to the flow method provided in fig. 4.
And S204, the MGW reports the terminal media stream inactive event to the MSC.
In step S204, the core network MGW device reports the detected terminal media stream inactivity event to the core network MSC device, and extends the Notify message of the h.248 standard to deliver the terminal media stream inactivity event.
And S205, the MSC sends a state 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 finds an SCCP connection according to the call context established for the satellite terminal, sends a NAS status query message to the satellite terminal based on the SCCP connection, and then starts a waiting timer to wait for the NAS status response message of the satellite terminal. The satellite terminal is normally connected with the satellite communication system, and the satellite terminal receives the NAS state request message sent by the core network MSC.
S206, MSC receives the state response message of NAS sent by the satellite terminal.
In step S206, the satellite terminal sends a NAS status response message to the core network MSC device, and 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, where the timeout period of the timer is greater than 15 minutes.
S207. the msc repeatedly starts the satellite terminal status detection procedure for the next round.
In step S207, after the period detection timer started by the core network MSC device expires, the process goes to step S201.
Therefore, when the satellite terminal transmits non-voice data based on the long-time call of the steps S201-S208, the method for preventing the 3G core network MGW & MSC equipment from detecting errors is provided, in the step S203, the core network MGW equipment may detect that the satellite terminal media stream is in an inactive state, and then the satellite terminal is further queried for the state through signaling by the core network equipment MSC, so that the problem of misjudgment of the satellite terminal networking state is not caused.
Working principle: the MGW detects whether the media content sent by the terminal to the core network is active or not during the call, so that the networking state of the satellite terminal is primarily judged, and a double-check mechanism of media stream detection and signaling inquiry is adopted to determine the networking state of the satellite terminal, so that the networking state of the satellite terminal is more accurately obtained. For the special data of abnormal voice sent during the communication of the satellite terminal, the same media load data can be sent continuously sometimes, so that the MGW primarily misjudges that the satellite terminal is in a disconnected network state, and then the MSC is restarted to inquire the state of the satellite terminal through signaling for further confirmation.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. An autonomous detection method for abnormal network disconnection of satellite mobile communication service is characterized in that: comprises the following steps
When a core network MSC establishes a call for a satellite terminal, indicating a core network MGW to detect the active state of a satellite terminal media stream sent from an access network in real time, wherein the core network MSC does not initiate NAS signaling state query information to the satellite terminal;
When the satellite terminal is normally networked with the access equipment through the satellite, the access network transmits media streams from the satellite terminal to the core network MGW in real time, and the core network MGW checks voice data of the satellite terminal in real time and judges that the media streams are active, and does not report active state events of the terminal media streams to the core network MSC;
Step three, when the satellite terminal and the wireless signal of the satellite are abnormally disconnected, the access network sends the media stream from the satellite terminal to the core network MGW in real time, the core network MGW checks the voice data of the satellite terminal in real time and judges that the media stream is inactive, an inactive state event of the terminal media stream is reported to the core network MSC, and the core network MSC starts a process of inquiring the state of the satellite terminal by using NAS signaling.
2. The autonomous detection method for abnormal network disconnection of satellite mobile communication service according to claim 1, wherein the method comprises the steps of: in the first step, the access network sends media stream from the satellite terminal to the core network MGW in real time, including:
① When a satellite terminal and a wireless signal of a satellite are normally connected and the satellite terminal transmits voice data to a core network, an access network transmits RTP packets to the core network MGW in real time, payload in the RTP packets is compressed voice data from the terminal, the voice data changes in real time when a satellite user speaks, and the core network MGW judges that the voice data is active;
② When a satellite terminal and a wireless signal of a satellite are normally connected and the satellite terminal transmits non-voice data to a core network, an access network transmits RTP packets to a core network MGW in real time, the Payload in the RTP packets is non-voice unlimited data from the terminal, if the special data is not real-time change, the core network MGW continuously detects that the load content of all received RTP packets is consistent and unchanged in a designated time, and the core network MGW judges that a media stream is inactive;
③ When the satellite terminal and the wireless signal of the satellite are abnormally disconnected, the access network also transmits RTP packets to the core network MGW in real time, the Payload in the RTP packets is default data or all zero data from the access network, the core network MGW continuously detects that the voice content of all received RTP packets is consistent and unchanged in a specified time, and the core network MGW judges that the media stream is inactive.
3. The autonomous detection method for abnormal network disconnection of satellite mobile communication service according to claim 1, wherein the method comprises the steps of: in the third step, the process of querying the satellite terminal state by the MSC through NAS signaling comprises the following steps:
① The core network MSC sends state inquiry information of NAS signaling to the satellite terminal, the core network MSC starts an inquiry waiting timer, the core network MSC judges whether the timing of the inquiry waiting timer exceeds a preset duration in real time, if yes, the timer is terminated, the core network MSC judges whether the number of times of sending the state inquiry information of the NAS signaling to the satellite terminal reaches a configuration maximum value, if not, the state inquiry information of the NAS signaling is repeatedly sent to the satellite terminal, and the waiting timer is restarted; if the maximum value is reached, judging that the satellite terminal is in a call disconnection state;
② If the core network MSC judges in real time that the timing of the waiting timer does not exceed the preset duration, the core network MSC receives the state inquiry response message of the NAS signaling of the satellite terminal, the waiting timer is terminated, the satellite terminal is judged to be in a call networking state, and the call is kept.
4. The autonomous detection method for abnormal network disconnection of satellite mobile communication service according to claim 3, wherein: MSC judges that satellite terminal is in call networking state, including:
The core network MSC starts a period detection timer, the core network MSC judges whether the timing of the inquiry waiting timer exceeds the preset duration in real time, if so, the timer is terminated, and the MGW is instructed to detect the active state of the satellite terminal media stream sent by the access network in real time, and the core network MSC does not initiate NAS signaling state inquiry information to the satellite terminal.
5. The autonomous detection method for abnormal network disconnection of satellite mobile communication service according to claim 4, wherein: when the satellite terminal is normally connected, the MGW may also detect that the media stream is inactive for the non-voice special media stream sent by the satellite terminal, start the NAS signaling query process through the MSC, and detect that the satellite terminal is in a call connection state through the signaling query method.
6. The autonomous detection method for abnormal network disconnection of satellite mobile communication service according to claim 3, wherein: MSC judges that satellite terminal is in a call disconnection state, including:
The core network MSC initiates a call release procedure, releasing call signaling to the access network and media processing resources to the MGW.
7. The autonomous detection method for abnormal network disconnection of satellite mobile communication service according to claim 6, wherein: after call establishment, MSC does not use NAS signaling to inquire the network connection state of the satellite terminal, firstly, the 3G core network MGW equipment is specified to detect whether the media stream sent by the satellite terminal to the core network is in a normal call state or not in real time, after the MGW detects that the media stream of the satellite terminal is in an inactive state, the MSC is informed to start the NAS signaling inquiry process, and finally, whether the satellite terminal is really disconnected or not is judged by the MSC through the NAS signaling inquiry process.
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| WO2007006206A1 (en) * | 2005-07-14 | 2007-01-18 | Zte Corporation | A method for detecting and releasing abnormal media gateway rtp resource |
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| WO2007006206A1 (en) * | 2005-07-14 | 2007-01-18 | Zte Corporation | A method for detecting and releasing abnormal media gateway rtp resource |
| CN101175303A (en) * | 2006-11-01 | 2008-05-07 | 华为技术有限公司 | System and device for implementing core net resource sharing and calling method of the system |
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| WO2015113487A1 (en) * | 2014-01-28 | 2015-08-06 | 大唐移动通信设备有限公司 | Method and apparatus for releasing communications service |
| CN105763748A (en) * | 2014-12-17 | 2016-07-13 | 上海粱江通信系统股份有限公司 | System for detecting called user state in signaling network and controlling call |
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