CN114374423A - 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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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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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 detecting whether media content sent to a core network by a terminal is active during call by a MGW, and determining the networking state of a satellite terminal by a double-check mechanism of media stream detection and signaling inquiry. The invention has the beneficial effects that: after the satellite terminal establishes a call session at the 3G core network side, the core network does not start periodic signaling query, so that the signaling interaction process after the session and the influence on the session quality are reduced; the core network MSC controls the core network MGW to start detecting the media stream content by a method for detecting the media stream non-active event, and can control the whole network disconnection detection process of the satellite terminal; and a media and signaling double detection mechanism is adopted, so that the detection accuracy of the satellite terminal networking state is improved.
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 environment (tunnel penetration), weather, and battery power consumption, the satellite terminal device may not normally communicate with the satellite, and the on-hook signal of the satellite terminal may not be normally transmitted to the msc (mobile Switching center) device of the core network. In order to prevent the problem of hanging up of the ultra-long call ticket, the call and the media resource, the 3G core network usually adopts a signaling query method to learn the networking state of the satellite terminal.
The signaling query method is that the MSC queries and searches the state of the satellite terminal through the state query of NAS (Non-Access-state, Non-Access stratum) signaling. Due to the shortage of air interface resources, the signaling state query can temporarily use a communication channel to influence the communication quality, and a large number of terminals occupy the signaling resources on the access network and the core network side due to frequent signaling state query to influence the stability of the system during online communication.
For the prior published application numbers: CN107332735A, which is a network communication method for automatic reconnection after disconnection, and solves the problem that the operation state of the network cannot be detected in time when automatic reconnection is performed when the communication between the terminal and the server is abnormal;
for the prior published application numbers: the CN112996102A is a method, an apparatus, a gateway device, a converged communication system, and a storage medium for managing a satellite terminal connection state, which solve the problem of network resource waste easily occurring in a converged communication scenario between a satellite communication system and a 5G core network.
In addition, in the prior art, the networking state of the satellite terminal is in a call phase, the prior art of the 3G core network generally adopts a signaling query method to acquire, and the query result needs to be confirmed by positioning and sending a query message to the satellite terminal, so that the query signaling temporarily occupies a call channel due to the shortage of air interface resources, thereby affecting the call quality, and when the number of the on-line call terminals is large, a large number of query messages exist between the 3G core network and the satellite terminal, thereby increasing the burden of the satellite access network.
Disclosure of Invention
The invention aims to provide an autonomous detection method for abnormal network disconnection of satellite mobile communication service, which aims to solve the problems, does not influence the call quality of a satellite terminal user, reduces the signaling interaction process between an MSC and a satellite terminal during the call period and lightens the signaling pressure of access network and core network equipment. And when the special satellite user is in non-voice communication, the terminal in normal network connection is not easy to be judged as the network disconnection state, so that the core network releases the call in advance.
The invention realizes the purpose through the following technical scheme: an autonomous detection method for abnormal network interruption of satellite mobile communication service comprises the following steps
Step one, when a core network MSC establishes a call for a satellite terminal, a core network MGW is indicated to detect the active state of a satellite terminal media stream sent from an access network in real time, and the core network MSC does not initiate an NAS signaling state query message to the satellite terminal;
step two, when the satellite terminal is normally connected with 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 MGW checks the voice data of the satellite terminal in real time and judges that the media stream is active, and the active state event of the terminal media stream is not reported to the core network MSC;
step three, when the wireless signal of the satellite terminal and the satellite is 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, the inactive state event of the terminal media stream is reported to the core network MSC, and the core network MSC starts the process of inquiring the state of the satellite terminal by using NAS signaling.
As a still further scheme of the invention: in the first step, the access network sends the media stream from the satellite terminal to the core network MGW in real time, which includes:
firstly, when a satellite terminal is normally connected with a wireless signal of a satellite and transmits voice data to a core network, an access network sends an RTP packet to a core network MGW in real time, Payload in the RTP packet is the 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;
when the wireless signal of the satellite terminal and the satellite is normally connected and the satellite terminal is communicated with the core network to transmit non-voice data, the access network sends an RTP packet to the core network MGW in real time, the Payload in the RTP packet is non-limiting data from the terminal, if the special data are not real-time changes, the core network MGW continuously detects that the load content of all the received RTP packets is consistent and unchanged within the appointed time, and the core network MGW judges that the media stream is inactive;
when the radio signal between the satellite terminal and the satellite is abnormal and the network is disconnected, the access network also sends RTP packets to the core network MGW in real time, Payload in the RTP packets is default data or data which is all zero and is accessed to the network, the core network MGW continuously detects that all the voice contents of the received RTP packets are consistent and unchanged within a specified time, and the core network MGW judges that the media stream is inactive.
As a still further scheme of the invention: in the third step, the process of querying the state of the satellite terminal by the MSC using NAS signaling includes:
firstly, a core network MSC sends a state query message of NAS signaling to a satellite terminal, the core network MSC starts a query waiting timer, the core network MSC judges whether the timing of the query waiting timer exceeds a preset time length in real time, if so, the timer is stopped, the core network MSC judges whether the number of times of sending the state query message of the NAS signaling to the satellite terminal reaches a configured maximum value, if not, the state query message of the NAS signaling is repeatedly sent to the satellite terminal, and the waiting timer is started again; if the maximum value is reached, judging that the satellite terminal is in a call disconnection state;
if the core network MSC judges that the timing of the waiting timer does not exceed the preset time length in real time, and the core network MSC receives the state query response message of the NAS signaling of the satellite terminal, the waiting timer is stopped, the satellite terminal is judged to be in a call networking state, and the call is kept.
As a still further scheme 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 periodic detection timer, the core network MSC judges whether the timing of the inquiry waiting timer exceeds the preset time length in real time, if so, the timer is terminated, the MGW is indicated to detect the active state of the media stream sent by the satellite terminal sent by the access network in real time again, and the core network MSC does not send the NAS signaling state inquiry message to the satellite terminal any more.
As a still further scheme of the invention: when the satellite terminal is normally connected with the network, 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, the NAS signaling query process is started through the MSC, the satellite terminal can be detected to be in a communication networking state through a signaling query method, and the possibility of misjudgment of a core network is prevented.
As a still further scheme of the invention: the MSC for judging that the satellite terminal is in the state of call disconnection comprises the following steps:
the core network MSC starts the call release process, releases the call signaling to the access network, and releases the media processing resource to the MGW.
As a still further scheme of the invention: after call establishment, the MSC does not firstly inquire the network connection state of the satellite terminal by using NAS signaling, firstly appoints 3G core network MGW equipment to detect whether the media stream sent to the core network by the satellite terminal is in a normal call state in real time, after detecting that the media stream of the satellite terminal is in an inactive state, the MGW informs the MSC to start the NAS signaling inquiry process, and the MSC finally judges whether the satellite terminal is really disconnected by the NAS signaling inquiry process. During the MGW detects that the media stream is in an active state, no extra signaling interaction process between the MSC and the satellite terminal exists, the call quality is not influenced, and the signaling interaction burden of the system is not increased.
The invention has the beneficial effects that:
1. after the satellite terminal establishes a call session at the 3G core network side, the core network does not start periodic signaling query, so that the signaling interaction process after the session and the influence on the session quality are reduced; reduce the frequency that the signaling detected, reduce the influence to speech quality: in the conversation process, the wireless channel resource is occupied by signaling interaction for inquiring the terminal state by signaling, and the conversation quality is influenced; the method for detecting the network disconnection adopts the sequential steps of firstly detecting the media abnormality and then sending out the signaling query, so that the signaling interaction flow in the conversation process can be obviously reduced;
2. the core network MSC controls the core network MGW to start detecting the media stream content by a method for detecting the media stream non-active event, and can control the whole network disconnection detection process of the satellite terminal; improvement of accuracy: the method for detecting the network interruption adopts a mechanism of common check of the media stream and the signaling, firstly detects whether the media stream normally has communication contents in real time, and further detects and confirms whether the terminal is really disconnected through the signaling if the media stream is abnormal. In some service scenarios, such as special encrypted data transmission, there may be a situation that communication data of a media stream does not change within a period of time, and false detection may occur when the media stream is used alone for detection.
3. And a media and signaling double detection mechanism is adopted, so that the detection accuracy of the satellite terminal networking state is improved.
Drawings
FIG. 1 is a schematic diagram of the detection interaction of call disconnection according to the present invention;
FIG. 2 is a schematic diagram of the detection interaction for communicating non-voice data in accordance with the present invention;
FIG. 3 is a schematic diagram illustrating a satellite terminal networking state detection process according to the present invention;
fig. 4 is a schematic diagram illustrating a media activity detection process of a satellite terminal according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, an autonomous detection method for abnormal network interruption of satellite mobile communication service includes the following steps
Step one, when a core network MSC establishes a call for a satellite terminal, a core network MGW is indicated to detect the active state of a satellite terminal media stream sent from an access network in real time, and the core network MSC does not initiate an NAS signaling state query message to the satellite terminal;
step two, when the satellite terminal is normally connected with 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 MGW checks the voice data of the satellite terminal in real time and judges that the media stream is active, and the active state event of the terminal media stream is not reported to the core network MSC;
step three, when the wireless signal of the satellite terminal and the satellite is 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, the inactive state event of the terminal media stream is reported to the core network MSC, and the core network MSC starts the process of inquiring the state of the satellite terminal by using NAS signaling.
In the embodiment of the present invention, in the first step, the sending, by the access network, the media stream from the satellite terminal to the core network MGW in real time includes:
firstly, when a satellite terminal is normally connected with a wireless signal of a satellite and transmits voice data to a core network, an access network sends an RTP packet to a core network MGW in real time, Payload in the RTP packet is the 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;
when the wireless signal of the satellite terminal and the satellite is normally connected and the satellite terminal is communicated with the core network to transmit non-voice data, the access network sends an RTP packet to the core network MGW in real time, the Payload in the RTP packet is non-limiting data from the terminal, if the special data are not real-time changes, the core network MGW continuously detects that the load content of all the received RTP packets is consistent and unchanged within the appointed time, and the core network MGW judges that the media stream is inactive;
when the radio signal between the satellite terminal and the satellite is abnormal and the network is disconnected, the access network also sends RTP packets to the core network MGW in real time, Payload in the RTP packets is default data or data which is all zero and is accessed to the network, the core network MGW continuously detects that all the voice contents of the received RTP packets are consistent and unchanged within a specified time, and the core network MGW judges that the media stream is inactive.
In the third step, the process of querying the state of the satellite terminal by the MSC using NAS signaling includes:
firstly, a core network MSC sends a state query message of NAS signaling to a satellite terminal, the core network MSC starts a query waiting timer, the core network MSC judges whether the timing of the query waiting timer exceeds a preset time length in real time, if so, the timer is stopped, the core network MSC judges whether the number of times of sending the state query message of the NAS signaling to the satellite terminal reaches a configured maximum value, if not, the state query message of the NAS signaling is repeatedly sent to the satellite terminal, and the waiting timer is started again; if the maximum value is reached, judging that the satellite terminal is in a call disconnection state;
if the core network MSC judges that the timing of the waiting timer does not exceed the preset time length in real time, and the core network MSC receives the state query response message of the NAS signaling of the satellite terminal, the waiting timer is stopped, the satellite terminal is judged to be in a call networking state, and the call is kept.
In the embodiment of the present invention, the determining, by the MSC, that the satellite terminal is in a call networking state includes:
the core network MSC starts a periodic detection timer, the core network MSC judges whether the timing of the inquiry waiting timer exceeds the preset time length in real time, if so, the timer is terminated, the MGW is indicated to detect the active state of the media stream sent by the satellite terminal sent by the access network in real time again, and the core network MSC does not send the NAS signaling state inquiry message to the satellite terminal any more.
In the embodiment of the invention, when the satellite terminal is normally connected with the network, 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, the NAS signaling query process is started through the MSC, and the satellite terminal can be detected to be in a communication networking state through the signaling query method, so that the possibility of misjudgment of a core network is prevented.
In the embodiment of the present invention, the determining, by the MSC, that the satellite terminal is in the disconnected state includes:
the core network MSC starts the call release process, releases the call signaling to the access network, and releases the media processing resource to the MGW.
In the embodiment of the invention, after call establishment, the MSC does not firstly inquire the network connection state of the satellite terminal by NAS signaling, firstly appoints 3G core network MGW equipment to detect whether the media stream sent by the satellite terminal to the core network is in a normal call state in real time, after detecting that the media stream of the satellite terminal is in an inactive state, the MGW informs the MSC to start the NAS signaling inquiry process, and the MSC finally judges whether the satellite terminal is really disconnected by the NAS signaling inquiry process. During the MGW detects that the media stream is in an active state, no extra signaling interaction process between the MSC and the satellite terminal exists, the call quality is not influenced, and the signaling interaction burden of the system is not increased.
Example two
Referring to fig. 2 to 4, an autonomous detection method for abnormal network disconnection of satellite mobile communication service in the present embodiment is a method for preventing a 3G core network MGW & MSC device from performing false detection when a satellite terminal is in a long-time call and transmits non-voice data, and the method may include, but is not limited to, the following steps S201 to S206.
S201, the satellite terminal establishes a call at 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, a call is established with the MSC of the 3G core network and other satellite terminals through the access network device, a media connection is established with the MGW of the 3G core network through the access network device, and media streams between the satellite terminal and other satellite terminals are mutually forwarded through the MGW.
S202, MSC sends down the detecting terminal media flow non-active event to MGW.
In step S201, the core network MSC device requests the core network MGW device to detect an inactivity event of the terminal media stream, and extends a Modify message of the h.248 standard to deliver the inactivity event of the terminal media stream.
S203, the satellite terminal and the 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 the media stream of the RTP packets to the core network MGW device in real time, where Payload loads of each RTP packet carry data of non-voice unlimited content from the terminal, and Payload loads of different RTP packets are the same data in a configurable time period, and the MGW detects that the media stream of the satellite terminal is in an inactive state according to the flow method provided in fig. 4.
And S204, the MGW reports the terminal media stream inactivity 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 the state inquiry 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 the SCCP connection according to the call context established for the satellite terminal, sends the NAS status query message to the satellite terminal based on the SCCP connection, and then starts the wait timer to wait for the NAS status response message of the satellite terminal. The satellite terminal and the satellite communication system are normally networked, and the satellite terminal receives the NAS state request message sent by the core network MSC.
And S206. the MSC receives the state response message of the NAS sent by the satellite terminal.
In step S206, the satellite terminal sends an NAS state response message to the core network MSC device, and after receiving the NAS state response 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 time of the timer is greater than 15 minutes.
And S207, repeatedly starting the next round of satellite terminal state detection process by the MSC.
In step S207, after the cycle detection timer started by the core network MSC device expires, the process goes to step S201.
Therefore, based on the method for preventing the 3G core network MGW & MSC device from performing the false detection when the satellite terminal performs the long-time call transmission on the non-voice data described in the foregoing steps S201 to S208, in step S203, the core network MGW device may detect that the media stream of the satellite terminal is in the inactive state, and further query the satellite terminal through signaling through the core network device MSC, so as not to cause the problem of misjudgment of the satellite terminal networking state.
The working principle is as follows: during the MGW detection conversation, whether media content sent to a core network by the terminal is active or not is judged, so that the networking state of the satellite terminal is preliminarily judged, a double-check mechanism of media stream detection and signaling inquiry is adopted to determine the networking state of the satellite terminal, and the networking state of the satellite terminal is more accurately acquired. For special data of abnormal voice sent by the satellite terminal during communication, the same media load data may be continuously sent sometimes, so that the MGW preliminarily misjudges that the satellite terminal is in a disconnected state, and then the MSC is started 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 attributes 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by 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
Step one, when a core network MSC establishes a call for a satellite terminal, a core network MGW is indicated to detect the active state of a satellite terminal media stream sent from an access network in real time, and the core network MSC does not initiate an NAS signaling state query message to the satellite terminal;
step two, when the satellite terminal is normally connected with 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 MGW checks the voice data of the satellite terminal in real time and judges that the media stream is active, and the active state event of the terminal media stream is not reported to the core network MSC;
step three, when the wireless signal of the satellite terminal and the satellite is 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, the inactive state event of the terminal media stream is reported to the core network MSC, and the core network MSC starts the process of inquiring the state of the satellite terminal by using NAS signaling.
2. The method according to claim 1, wherein the method comprises the following steps: in the first step, the access network sends the media stream from the satellite terminal to the core network MGW in real time, which includes:
firstly, when a satellite terminal is normally connected with a wireless signal of a satellite and transmits voice data to a core network, an access network sends an RTP packet to a core network MGW in real time, Payload in the RTP packet is the 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;
when the wireless signal of the satellite terminal and the satellite is normally connected and the satellite terminal is communicated with the core network to transmit non-voice data, the access network sends an RTP packet to the core network MGW in real time, the Payload in the RTP packet is non-limiting data from the terminal, if the special data are not real-time changes, the core network MGW continuously detects that the load content of all the received RTP packets is consistent and unchanged within the appointed time, and the core network MGW judges that the media stream is inactive;
when the radio signal between the satellite terminal and the satellite is abnormal and the network is disconnected, the access network also sends RTP packets to the core network MGW in real time, Payload in the RTP packets is default data or data which is all zero and is accessed to the network, the core network MGW continuously detects that all the voice contents of the received RTP packets are consistent and unchanged within a specified time, and the core network MGW judges that the media stream is inactive.
3. The method according to claim 1, wherein the method comprises the following steps: in the third step, the process of querying the state of the satellite terminal by the MSC using NAS signaling includes:
firstly, a core network MSC sends a state query message of NAS signaling to a satellite terminal, the core network MSC starts a query waiting timer, the core network MSC judges whether the timing of the query waiting timer exceeds a preset time length in real time, if so, the timer is stopped, the core network MSC judges whether the number of times of sending the state query message of the NAS signaling to the satellite terminal reaches a configured maximum value, if not, the state query message of the NAS signaling is repeatedly sent to the satellite terminal, and the waiting timer is started again; if the maximum value is reached, judging that the satellite terminal is in a call disconnection state;
if the core network MSC judges that the timing of the waiting timer does not exceed the preset time length in real time, and the core network MSC receives the state query response message of the NAS signaling of the satellite terminal, the waiting timer is stopped, the satellite terminal is judged to be in a call networking state, and the call is kept.
4. The method according to claim 3, wherein the method comprises the following steps: the MSC judges that the satellite terminal is in a call networking state, and comprises the following steps:
the core network MSC starts a periodic detection timer, the core network MSC judges whether the timing of the inquiry waiting timer exceeds the preset time length in real time, if so, the timer is terminated, the MGW is indicated to detect the active state of the media stream sent by the satellite terminal sent by the access network in real time again, and the core network MSC does not send the NAS signaling state inquiry message to the satellite terminal any more.
5. The method according to claim 4, wherein the method comprises the following steps: when the satellite terminal is normally connected with the network, for the non-voice special media stream sent by the satellite terminal, the MGW can also detect that the media stream is in a non-active state, the NAS signaling query process is started through the MSC, and the satellite terminal can be detected to be in a communication networking state through the query method of the signaling.
6. The method according to claim 3, wherein the method comprises the following steps: the MSC for judging that the satellite terminal is in the state of call disconnection comprises the following steps:
the core network MSC starts the call release process, releases the call signaling to the access network, and releases the media processing resource to the MGW.
7. The method according to claim 6, wherein the method comprises the following steps: after call establishment, the MSC does not firstly inquire the network connection state of the satellite terminal by using NAS signaling, firstly appoints 3G core network MGW equipment to detect whether the media stream sent to the core network by the satellite terminal is in a normal call state in real time, after detecting that the media stream of the satellite terminal is in an inactive state, the MGW informs the MSC to start the NAS signaling inquiry process, and the MSC finally judges whether the satellite terminal is really disconnected by the NAS signaling inquiry process.
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