CN100466820C - Method and system for switching request of core network processing terminal - Google Patents
Method and system for switching request of core network processing terminal Download PDFInfo
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Abstract
The invention relates to a method for processing the terminal switch request of corn network, and relative system, wherein said method comprises: A, terminal sends switch request to the target network and obtains the switch priority level parameter, then uploads said parameter to the corn network; B, evaluating present load of corn network, the corn network, based on said evaluated result and the reported switch priority level parameter, selectively accepts or rejects the switch request of terminal. With said method, the invention also provides relative system, to optimize the impact of large-scale switch request on the corn network; in addition, the invention can recognize the level of switch request, and the corn network can filter some unnecessary switch request when load is heavy or load is in limit, to realize better property.
Description
Technical field
The present invention relates to the switching field of cordless communication network, relate in particular to a kind of method and system of core network processing terminal handoff request.
Background technology
At present the network development direction is that interconnected and intercommunication realizes the seamless switching of a speech business between networks with different systems by heterogeneous network.
With reference to Fig. 1, Fig. 1 is that the terminal of prior art is switched networking diagram, described prior art is a kind of continuous voice call (VCC) scheme, subscriber equipment (UE) is realizing under the control of IP Multimedia System (IMS) network that the switching of voice between third generation partner program (3GPP) network and wireless lan (wlan), the terminal switching method of described prior art are that handoff procedure is shifted in the territory.Terminal in being in voice call covers when entering the WLAN signal cover away from the signal of cellular phone network, the situation that terminal can change according to the signal and the WLAN signal of cellular phone network is initiated the handoff request that shift in the territory to wlan network, and voice conversation is transferred to wlan network.On the contrary, when terminal enters the cellular phone network signal cover away from the covering of WLAN signal, terminal also can be initiated the handoff request that shift in the territory to cellular phone network according to the situation of cellular phone network and the variation of WLAN signal, and voice conversation is transferred to cellular phone network.
Wherein, described cellular phone network can be the UMTS network, the IS95 network of GSM network or CDMA standard and 1X network, and other provides the mobile communications network based on Circuit-switched speech business, also available other of wlan network provides the radio network technique of the speech business (VoIP) that exchanges based on IP to replace simultaneously, such as bluetooth (Bluetooth), World Interoperability for Microwave Access, WiMax (WiMAX, World Interoperability for Microwave Access), the cdma network of the exchanges data of UMTS (PS) network or evolution data optimization (EVDO, Evolution Data Optimized) etc.The IMS network is a kind of standardized multimedia service network based on the Internet engineering work group (IETF) serial protocols, it is based upon on the packet switched bearer, both but call transmission was controlled signaling, also can bearing data service, in addition, the IMS network has been set up the special switching plane that call/session is controlled, and is used to realize separating of call/session control plane and multimedia load plane.At present, the IMS network is defined as supporting the IP Access Network of form of ownership, it can support any mobile or fixing, wired or wireless IP connection access network (IP-CAN, IP Connectivity Access Networks), comprise Wideband Code Division Multiple Access (WCDMA) (WCDMA), Ethernet (Ethernet), digital subscriber line (xDSL) and wireless lan (wlan) or the like.
Shift in the handoff procedure in the territory, the UE of cellular phone network is connected to the mobile network switching center (VMSC) that is interviewed by corresponding Access Network, VMSC is connected to public telephone network (PSTN) by multimedia gateway (MGW) and multimedia gateway control module (MGCF) respectively, thereby in circuit domain (CS), the subscriber equipment of universal mobile telecommunications system (UMTS)/global system for mobile communications (GSM), mobile network switching center (VMSC) is interviewed, formed the control signalling path of a Signaling System 7(SS-7) (SS7) between multimedia gateway control module (MGCF) and the public telephone network (PSTN), simultaneously at subscriber equipment, mobile network switching center (VMSC) is interviewed, also formed a service bearer passage between multimedia gateway (MGW) and the public telephone network (PSTN).Wherein, multimedia gateway (MGW) and multimedia gateway control module (MGCF) interconnection, MGCF pass through H.248/MEGACO agreement control MGW.
In addition, the subscriber equipment of wireless lan (wlan) is connected to call session control module (CSCF) by corresponding Access Network in the IMS network, CSCF connects IP network, multimedia gateway control module (MGCF) more respectively and calls out continuous control module (CCCF), and subscriber equipment also is connected to PSTN by multimedia gateway MGW simultaneously.The effect of CSCF is that call business is carried out logic business control and routing function, is topmost operation controlling entity; The effect of MGCF is to select CSCF according to called number and calling situation, and finishes call control protocol conversion between PSTN and the IMS, and control IP multimedia network gateway controller (IM-MGW, IP Multimedia-MGW) is finished the adaptive of media conversion and bearer path.Simultaneously, have voice conversation to connect between user B and the user A, user B is by the IMS network at PSTN network access user A place, and wherein, user A is a dual-mode terminal, supports IMS network insertion and circuit domain to insert dual mode simultaneously.
Because the territory of UE terminal is shifted to switch and is realized on IMS core net plane in the above-mentioned prior art, each change action of terminal all is equivalent to initiate a calling to the IMS core net, also the IMS core net having been increased once new calling impacts, though the calling user number can be above hundreds thousand of simultaneously on the IMS core network switches, it is so much that but simultaneously treated call request does not but have, if it is similar that the frequency and the cellular phone network switching frequency that take place are shifted in the territory, shift being switched the call request quantity brought is huge test by the territory to the capacity of switch, the handshaking procedure that hand-off process can influence other normal voice sessions is shifted in simultaneously too much territory, so the IMS core net must shift handoff request to the territory of terminal and control, but, the handoff request that shift in the uncontrollable territory of IMS core net in the above-mentioned prior art, handoff request is shifted in the territory of execution terminal that can only be passive.In addition, above-mentioned prior art is under the very heavy situation of load, and the IMS core net can't shift the handoff reservation resource for important territory, perhaps can't switch by the important field transition calling of priority treatment.Therefore the defective of above-mentioned prior art is the handoff request that the IMS core net can not control terminal, the severity level that simultaneously can not identification terminal switches.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and system of core network processing terminal handoff request, the handoff request that the core net in the described method and system can control terminal.
For solving the problems of the technologies described above, the invention provides a kind of method of core network processing terminal handoff request, this method may further comprise the steps:
A, terminal are initiated handoff request to objective network, and obtain the switching priority parameters according to the quality of current network and objective network, upload described switching priority parameters to core net again;
B, the present load of core net is assessed, core-network side accepts or refuses the handoff request of terminal more selectively according to the switching priority parameters of assessment result and terminal to report.
Wherein, obtaining the switching priority parameters in the steps A specifically may further comprise the steps:
A11, the threshold value of current network and objective network is set, according to described threshold value the network quality of current network and objective network is marked again;
The difference of current network and objective network quality score is obtained in A12, calculating, obtains the switching priority parameters corresponding with described difference again.
Wherein, further comprise after the steps A 12:
A13, terminal judge according to the switching priority parameters of obtaining whether current business urgent, if, switch priority be set to the highest, execution in step A14 again, otherwise execution in step A14;
A14, the described switching priority parameters of storage.
Wherein, when terminal switches to IMS domain from circuit domain, upload the switching priority parameters to core net in the steps A and specifically comprise:
Terminal sends invitation message to the IP Multimedia System core net, and carries the switching priority parameters in invitation message.
Wherein, when terminal switches to circuit domain from IMS domain, upload the switching priority parameters to core net in the steps A and specifically comprise:
Terminal sends message request to the mobile network switching center that is interviewed and connects, and in message, carry the switching priority parameters, be interviewed and generate new message after described message is received by mobile network switching center, give the multimedia gateway control module with described new forwards again, after the multimedia gateway control module is received described new message, convert the User-to-User Signaling field in the conversation initiating protocol message switching priority parameters, convert invitation message again to and send to the IP Multimedia System core net.
Wherein, the handoff request of accepting or refuse terminal selectively according to the switching priority parameters of assessment result and terminal to report among the step B specifically may further comprise the steps:
The threshold value of switching priority parameters is set, and switching priority parameters and the threshold value that will upload compare, core-network side defines rejection probability according to comparative result and assessment result again, and accepts or refuse the handoff request of terminal selectively according to rejection probability.
Wherein, core-network side definition rejection probability specifically comprises:
Under identical present load situation, be less than or equal switching the little set rejection probability of handoff request of priority parameters to switching the big set rejection probability of handoff request of priority parameters; Switching under the identical situation of priority parameters, the light set rejection probability of present load is being less than the heavy or set rejection probability of load limit to load.
Wherein, core net during the handoff request of receiving terminal, further comprises after the step B selectively:
Core net is carried out the handoff request of terminal, and discharges the resource that this switching is occupied after switching is finished.
According to said method, the present invention also provides a kind of system of core network processing terminal handoff request, and this system is achieved in that
A kind of system of core network processing terminal handoff request, this system comprises terminal, current network, objective network, core net,
Terminal is used for initiating handoff request to objective network, and obtains the switching priority parameters according to the quality of current network and objective network, more described switching priority parameters is uploaded to core net;
Core net one side comprises control unit, is used for present load is assessed, and the handoff request of terminal is accepted or refused to the switching priority parameters of uploading according to assessment result and terminal selectively again.
Wherein, described terminal comprises application module, be used to be provided with the threshold value of current network and objective network, and the network quality of current network and objective network is marked according to described threshold value, and calculate the difference of obtaining current network and objective network quality score, obtain the switching priority parameters corresponding again with described difference.
Wherein, described control unit is further used for being provided with the threshold value of switching priority parameters, and the switching priority parameters and the threshold value that will report compare, again according to comparative result and assessment result definition rejection probability.
Above technical scheme as can be seen, the invention provides a kind of method and system of core network processing terminal handoff request, because the handoff request of terminal is accepted or refused to the switching priority parameters that the present load situation of core net lateral root certificate itself and terminal are uploaded among the present invention selectively, compare with the handoff request of the passive execution terminal of prior art, core net of the present invention can control terminal handoff request, and then can optimize of the impact of large-scale handoff request to core net.In addition, because the present invention defines rejection probability according to the switching priority parameters that the present load situation and the terminal of core net are uploaded, thereby make core net can discern the severity level of handoff request, core net is set lower rejection probability to the handoff request that severity level is high under load weight or load limit situation simultaneously; And the low handoff request of severity level is provided with higher relatively rejection probability, and like this can the low handoff request of filter some unnecessary, thus make core net under the heavier situation of load, reasonable combination property can be arranged.
Description of drawings
Fig. 1 is the switching networking diagram of prior art;
Fig. 2 obtains the flow chart that switches priority parameters in the inventive method execution mode;
Fig. 3 is the switching flow figure of first kind of execution mode of the inventive method;
Fig. 4 is the switching flow figure of second kind of execution mode of the inventive method;
Fig. 5 is the block diagram of system implementation mode of the present invention.
Embodiment
The invention provides a kind of method of core network processing terminal handoff request, the basic thought of described method is: terminal is initiated handoff request to objective network, and obtains the switching priority parameters, uploads described switching priority parameters to core net again; Present load to core net is assessed, and core-network side accepts or refuse the handoff request of terminal more selectively according to the switching priority parameters of assessment result and terminal to report.
According to above-mentioned basic thought, shifting switching mode with the territory of terminal below is example, in conjunction with the accompanying drawings the concrete technical scheme of the inventive method is elaborated again.
One, terminal is obtained the switching priority parameters.
Terminal covered the covering of beginning target approach network signal gradually away from the current network signal when, terminal can initiatively be initiated handoff request to objective network, also can obtain the switching priority parameters according to the situation of current network and the variation of objective network signal simultaneously.
With reference to Fig. 2, Fig. 2 obtains the flow chart that switches priority parameters in the inventive method execution mode, and terminal is obtained the switching priority parameters and specifically be may further comprise the steps:
| The Delta value | -2 | -1 | 0 | 1 | 2 |
| Switch priority parameters | X1 | X2 | X3 | X4 | X5 |
Table 1
If step 205 current business is urgent, switches priority and be set to the highest;
Two, after terminal is obtained and switched priority parameters, need upload described switching priority parameters to core net, core-network side is assessed current load, again the switching priority parameters that provides according to assessment result and the terminal handoff request of coming processing terminal.
With reference to Fig. 3, Fig. 3 is the switching flow figure of first kind of execution mode of the inventive method, wherein, network of universal mobile communication system (UMTS) expression current network, wireless lan (wlan) is represented objective network, core net is IP Multimedia System (IMS) network, and described flow process is exactly the process that switches to the IMS territory from circuit domain, specifically may further comprise the steps:
When step 301, preparation switching, calling terminal exists voice call to connect in the circuit domain of UMTS.Calling terminal is to send to IMS core net (IMS CN) by wireless lan (wlan) to invite (INVITE) message, called address is for calling out the address of continuous control module (CCCF) in the IMS territory, the information that INVITE carries comprises Session Description Protocol (SDP, session description protocol) message and connection (Contact) information specifically can see Table 2.Wherein, described SDP message is used for describing real-time protocol (RTP) (RTP, the real-time protocol) information of this calling, and RTP information comprises the multimedia processing capability of terminal and agreement and the IP port numbers that multimedia communication is used; Link information is used to identify the IP address information of this session initiation protocol (SIP) terminal, and some additional end messages, comprises and switches priority (Handoff Priority) parameter, the severity level when being used to indicate the transfer switching of described terminal execution territory.
| INVITE | Session initiation protocol (SIP) command messages type, SIP/2.0 refers to IETF 3261 Standard Editions, INVITE belongs to the defined order class of IETF 3261 standards type of message |
| Via | Identification message is transmitted the path node of process in network |
| Max-Forwards | The maximum path interstitial content of sign a piece of news energy process |
| From | Calling user information |
| To | Called user information |
| Contact | Identify the IP address information of this sip terminal, and additional end message, such as, the priority when the switching priority parameters can be used to indicate this terminal execution switching |
| Call-ID | The information of a SIP session of unique identification |
| Content-Type | The medium type of the message body that sip message comprises |
| Content-Length | The length of the message body that sip message comprises is unit with the byte |
Table 2
Step 302, IMS core net are confirmed this message after receiving INVITE, activate the correspondent service logic controlled function again, according to the CAMEL-Subscription-Information of terminal called Session Description Protocol (SDP) ability of this call request is authorized then, then forward to before the INVITE that the IMS core net will be confirmed and call out continuous control module (CCCF).The effect of CCCF is the request of accepting and handle relevant call continuity, these requests are relevant with wireless environment, it may be the Internet resources problem, also may be that wireless coverage causes, a calling need be responsible for setting up new calling when terminal when circuit domain switches to IMS territory or phase anti-switching and connect, delete old calling and connect.
Step 303, CCCF stop the continuous transmission of this INVITE after receiving INVITE, and assist calling terminal to the connection that makes a call of the long-range terminal called of conversation, described message comprises new INVITE and the SDP message in the step 301 that regenerates, and then more described message is sent to the IMS core net.
The CCCF of IMS core-network side assesses according to the loading condition of IMS network, with different color showing present load situations, such as setting in advance two thresholding C1 and C2, and C1＜C2, when core network load gently is assessed as green with load during less than C1, the expression load is light; When core network load is not less than C1, and load is assessed as yellow during less than C2, the expression load is heavy; When core network load is assessed as redness with load during more than or equal to C2, the expression load limit.CCCF defines rejection probability according to the color of load and the switching priority parameters that reports again, and accepts selectively or critical region transfer handoff request according to rejection probability.Wherein, the definition rejection probability can be adjusted according to actual conditions, and it is as follows specifically to define rejection probability:
At first, for every kind of core network load color is provided with two thresholdings that switch priority parameters, for example: the core network load color is green, and the thresholding that switches priority parameters is E11 and E12, and E11＜E12; The core network load color is yellow, and the thresholding that switches priority parameters is E21 and E22, and E21＜E22; The core network load color is red, and the thresholding that switches priority parameters is E31 and E32, and E31＜E32.
Then, switching priority parameters and threshold value that the CCCF of IMS core-network side will report compare, again according to comparative result and assessment result definition rejection probability.Usually, rejection probability is like this definition: under identical load color situation, shift the set rejection probability of handoff request and be less than or equal and shift the set rejection probability of handoff request to switching the little territory of priority parameters switching the big territory of priority parameters; Switching under the identical situation of priority parameters, the light set rejection probability of load is being less than the heavy or set rejection probability of load limit to load.Wherein, the present invention is to switching the urgency level that priority parameters has defined this handoff request, and it is big more to switch priority parameters, illustrates that the urgency level of this handoff request is high more, and it is just high more to switch priority, and severity level is also high more.
According to the comparative result definition rejection probability of core net present load color and switching priority parameters and threshold value, suppose to switch priority parameters and be K below, specific as follows:
When the core network load color was green, the rejection probability of K＜E11 was G11, and the rejection probability of E11＜K＜E12 is G12, K〉rejection probability of E12 is G13;
When the core network load color was yellow, the rejection probability of K＜E21 was G21, and the rejection probability of E21＜K＜E22 is G22, K〉rejection probability of E22 is G23;
When core network load color when being red, the rejection probability of K＜E31 is G31, and the rejection probability of E31＜K＜E32 is G32, K〉rejection probability of E32 is G33.
After step 304, IMS core net are received INVITE, again this message forwarding is arrived long-range terminal called;
After step 305, long-range terminal called are received INVITE, return the response message of 200 OK and give the IMS core net;
After step 306, IMS core net are received 200 OK message, again with this message forwarding to CCCF;
Step 307, CCCF send to the IMS core net with the response message of 200 OK;
The response message that step 308, IMS core net send 200 OK again is to calling terminal, and the notice calling terminal illustrate with the speech channel of terminal called and connects, and this message is the replying of INVITE in the step 303.
After step 309, calling terminal are received the response message of 200 OK, return ACK message and give the IMS core net, representative domain shifts to switch and finishes;
Step 310, IMS core net are connected to CCCF with ACK message route again;
Step 311, CCCF give the IMS core net with the ACK forwards;
The ACK message forwarding that step 312, IMS core net are sent calling terminal again is to long-range terminal called;
Step 313, CCCF send the BYE order to the IMS core net, prepare to discharge the circuit domain resource;
Step 314, IMS core net forward multimedia gateway control module (MGCF) to before BYE is ordered, and MGCF orders multimedia gateway (MGW) to discharge traffic resource again;
Step 315, MGCF send REL message to the mobile network switching center (VMSC) that is interviewed, and order VMSC discharges traffic resource;
The disconnect command of step 317, calling terminal response VMSC discharges the speech channel of circuit domain, and returns Release Complete and give MGCF;
Step 318, VMSC return RLC message and give MGCF;
Step 319, MGCF are returned the response message of 200 OK to the IMS core net, tell IMS core net traffic resource to discharge and finish;
Step 320, IMS core net to CCCF, are told 200 OK message forwardings the CCCF traffic resource discharge and are finished.
With reference to Fig. 4, Fig. 4 is the switching flow figure of second kind of execution mode of the inventive method, wherein, network of universal mobile communication system (UMTS) expression objective network, wireless lan (wlan) is represented current network, core net is IP Multimedia System (IMS) network, and described flow process is exactly the process that switches to circuit domain from the IMS territory, specifically may further comprise the steps:
Step 401, when beginning to switch, the speech business (VoIP) that calling terminal exists in the IMS territory based on the IP exchange connects, the calling terminal mobile network switching center (VMSC) that is interviewed in the UMTS network again sends Setup message, voice conversation is set up in request, the called number form of this request message is the E.164 number of standard, described E.164 number is used for call request is routed to CCCF, wherein, switching priority (Handoff Priority) parameter uploaded of the User-to-User Signaling field in the SETUP message (User-User Signaling IE) carried terminal.
Terminal to report switches priority parameters, need carry the switching priority parameters by SETUP message, though the 3GPP agreement has defined the User-to-User Signaling field in SETUP message, but the content and the use that do not have this field information of concrete norm, from the 4th byte of this field is exactly the field that the user can define information format voluntarily, the standard of self-defined information form is as follows: first byte is the ability information sign, and byte afterwards is the particular content of this ability information.
After step 402, VMSC received the call request of terminal, calculated address initial message (IAM) also sent to multimedia gateway control module (MGCF), reserved corresponding network trunk circuit resource for calling out again.
After step 403, MGCF receive IAM message, convert User-User Signaling IE in the sip message switching priority parameters, convert INVITE again to, and with Call Forwarding to the IMS core net;
Step 404, IMS core net send INVITE to calling out continuous control module (CCCF);
Step 405, CCCF stop the continuous transmission of this INVITE after receiving INVITE, and assist calling terminal to the connection that makes a call of the long-range terminal called of conversation, described message comprises new INVITE and the SDP message that regenerates, and then more described message is sent to the IMS core net.
The CCCF of IMS core-network side assesses according to current loading condition, with the present load situation of different color showing IMS networks, such as setting in advance two thresholding C1 and C2, and C1＜C2, when core network load gently is assessed as green with load during less than C1, the expression load is light; When core network load is not less than C1, and load is assessed as yellow during less than C2, the expression load is heavy; When core network load is assessed as redness with load during more than or equal to C2, the expression load limit.CCCF defines rejection probability according to the color situation of load and the switching priority parameters that reports again, and handles selectively or critical region transfer handoff request according to rejection probability.Wherein, the definition rejection probability can be adjusted according to actual conditions, and it is as follows specifically to define rejection probability:
At first, for every kind of core network load color is provided with two thresholdings that switch priority parameters, for example: the core network load color is green, and the thresholding that switches priority parameters is E11 and E12, and E11＜E12; The core network load color is yellow, and the thresholding that switches priority parameters is E21 and E22, and E21＜E22; The core network load color is red, and the thresholding that switches priority parameters is E31 and E32, and E31＜E32.
Then, switching priority parameters and threshold value that the CCCF of IMS core-network side will report compare, again according to comparative result and assessment result definition rejection probability, usually, rejection probability is like this definition: under identical load color situation, shift the set rejection probability of handoff request and be less than or equal and shift the set rejection probability of handoff request to switching the little territory of priority parameters switching the big territory of priority parameters; Switching under the identical situation of priority parameters, the light set rejection probability of load is being less than the heavy or set rejection probability of load limit to load.Wherein, the present invention is to switching the urgency level that priority parameters has defined this handoff request, and it is big more to switch priority parameters, illustrates that the urgency level of this handoff request is high more, and it is just high more to switch priority, and severity level is also high more.
According to the comparative result definition rejection probability of core net present load color and switching priority parameters and threshold value, suppose to switch priority parameters and be K below, specific as follows:
When the core network load color was green, the rejection probability of K＜E11 was G11, and the rejection probability of E11＜K＜E12 is G12, K〉rejection probability of E12 is G13;
When the core network load color was yellow, the rejection probability of K＜E21 was G21, and the rejection probability of E21＜K＜E22 is G22, K〉rejection probability of E22 is G23;
When core network load color when being red, the rejection probability of K＜E31 is G31, and the rejection probability of E31＜K＜E32 is G32, K〉rejection probability of E32 is G33.
After step 406, IMS core net are received INVITE, again this message forwarding is arrived long-range terminal called;
After step 407, long-range terminal called are received INVITE, return the response message of 200OK and give the IMS core net;
After step 408, IMS core net are received 200 OK message, again with this message forwarding to CCCF;
Step 409, CCCF send to the IMS core net with the response message of 200 OK;
Step 410, IMS core net send the response message of 200 OK again to MGCF;
Step 411, MGCF receive after the response message of 200 OK to send to VMSC and reply (ANM) message that notice VMSC speech channel is connected;
Step 412, VMSC send CONNECT message to calling terminal after receiving ANM, and the notice speech channel is connected;
Step 413, MGCF give the IMS core net with the ACK forwards;
The ACK message forwarding that step 414, IMS core net are sent calling terminal again is to long-range CCCF;
Step 415, CCCF send ACK message to the IMS core net;
Step 416, IMS core net send ACK message to long-range terminal called;
Step 417, CCCF send the BYE order to the IMS core net, prepare to discharge the circuit domain resource;
Step 418, IMS core net send to calling terminal with the BYE order, and the calling terminal response command also discharges traffic resource;
Step 419, calling terminal are returned the response message of 200 OK to the IMS core net, tell IMS core net traffic resource to discharge and finish;
Step 420, IMS core net to CCCF, are told 200 OK message forwardings the CCCF traffic resource discharge and are finished.
From the above, the execution mode of the inventive method is that switching is shifted in the territory of continuous voice call, speech business is to switch between the network of the circuit domain of UMTS network and support IP access, and then speech business is controlled by the IMS network unification that is based upon on UMTS and the IP network, described execution mode is the switching of speech business, in addition, it can also be professional switching such as multimedia or data, wherein, current network and objective network can be cellular networks, non-cellular network, support the network of form of ownership IP access etc., for example, global system for mobile communications (GSM), universal mobile telecommunications system (UMTS), GPRS (GPRS), Wideband Code Division Multiple Access (WCDMA) (WCDMA), bluetooth (Bluetooth), Ethernet (Ethernet), digital subscriber line (xDSL), wireless lan (wlan), World Interoperability for Microwave Access, WiMax (WiMAX, World Interoperability for Microwave Access), cdma network of the exchanges data of UMTS (PS) network or evolution data optimization (EVDO, Evolution Data Optimized) or the like.By above-mentioned execution mode as can be known, calling terminal switches at service connected state, and similarly, calling terminal is not having connection status can switch yet, as tone information etc.In addition, calling terminal is a dual-mode terminal, and it can also be a multimode terminal of supporting two or more wireless communication functions, can adopt soft handover or hard handover approach simultaneously when the handoff request of processing terminal.
According to said method, the present invention also provides a kind of system of core network processing terminal handoff request, and with reference to Fig. 5, Fig. 5 is the block diagram of system implementation mode of the present invention, and this system comprises terminal 501, current network 502, core net 503 and objective network 504.
Wherein, terminal 501 comprises application module 505, be used to monitor current network 502 and objective network 504, and threshold value is set respectively according to the characteristic of current network 502 and objective network 504, it can be signal strength signal intensity or signal interference ratio etc. that threshold value sets up standard, according to described setting thresholding the network quality of current network 502 and objective network 504 is marked again, the high more network quality that shows of obatained score is good more, then calculate the scoring difference of objective network 504 and current network 502 quality, and obtain the switching priority parameters corresponding with described difference, judge according to switching priority parameter then, and when current business is urgency traffic, switch priority parameters and be set to the highest, terminal 501 is stored described switching priority parameters again, and uploads described switching priority parameters to IP Multimedia System core net 503.
Wherein, core net 503 comprises control unit 506, be used for the present load situation of core net 503 is assessed, and with the situation of color showing present load, the threshold value of switching priority parameters is set then, switching priority parameters and threshold value that control unit 506 will be uploaded again compare, and define rejection probability according to comparative result and assessment result again, and accept or refuse the handoff request of terminal selectively according to rejection probability.Usually core net 503 all is to adopt IP Multimedia System (IMS) network to realize the calling continuous control module that pairing control unit 506 can be the IMS core-network side etc.
From the above, the execution mode of system of the present invention is that switching is shifted in the territory of continuous voice call, speech business is to switch between the circuit domain of current network 502 and objective network 504, and then speech business is controlled by the core net unification that is based upon on current network 502 and the objective network 504, wherein, described core net 503 is IMS networks, and the IMS network is defined as supporting the IP Access Network of form of ownership.System implementation mode of the present invention is the switching of speech business, in addition, can also be professional switching such as multimedia or data.Wherein, current network 502 and objective network 504 can be cellular networks, non-cellular network, support the IP access network of form of ownership etc., for example, global system for mobile communications (GSM), universal mobile telecommunications system (UMTS), GPRS (GPRS), Wideband Code Division Multiple Access (WCDMA) (WCDMA), bluetooth (Bluetooth), Ethernet (Ethernet), digital subscriber line (xDSL), wireless lan (wlan), World Interoperability for Microwave Access, WiMax (WiMAX, World Interoperability forMicrowave Access), cdma network of the exchanges data of UMTS (PS) network or evolution data optimization (EVDO, Evolution Data Optimized) or the like.Control unit 506 is the sides in core net 503 simultaneously, and it can be the part of core net 503, also can be a separate unit.In addition, terminal of the present invention is a dual-mode terminal, and it can also be a multimode terminal of supporting two or more wireless communication functions, can adopt soft handover or hard handover approach simultaneously when the handoff request of processing terminal.
More than the method and system of a kind of core network processing terminal handoff request provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1, a kind of method of core network processing terminal handoff request is characterized in that, this method may further comprise the steps:
A, terminal are initiated handoff request to objective network, and obtain the switching priority parameters according to the quality of current network and objective network, upload described switching priority parameters to core net again;
B, the present load of core net is assessed, core-network side accepts or refuses the handoff request of terminal more selectively according to the switching priority parameters of assessment result and terminal to report.
2, the method for core network processing terminal handoff request as claimed in claim 1 is characterized in that, obtains the switching priority parameters in the steps A and specifically may further comprise the steps:
A11, the threshold value of current network and objective network is set, according to described threshold value the network quality of current network and objective network is marked again;
The difference of current network and objective network quality score is obtained in A12, calculating, obtains the switching priority parameters corresponding with described difference again.
3, the method for core network processing terminal handoff request as claimed in claim 2 is characterized in that, further comprises after the steps A 12:
A13, terminal judge according to the switching priority parameters of obtaining whether current business urgent, if, switch priority be set to the highest, execution in step A14 again, otherwise execution in step A14;
A14, the described switching priority parameters of storage.
4, as the method for claim 1,2 or 3 described core network processing terminal handoff request, it is characterized in that, when terminal switches to IMS domain from circuit domain, upload the switching priority parameters to core net in the steps A and specifically comprise:
Terminal sends invitation message to the IP Multimedia System core net, and carries the switching priority parameters in invitation message.
5, as the method for claim 1,2 or 3 described core network processing terminal handoff request, it is characterized in that, when terminal switches to circuit domain from IMS domain, upload the switching priority parameters to core net in the steps A and specifically comprise:
Terminal sends message request to the mobile network switching center that is interviewed and connects, and carries the switching priority parameters in message;
Being interviewed generates new message after described message is received by mobile network switching center, gives the multimedia gateway control module with described new forwards again;
After the multimedia gateway control module is received described new message, convert the User-to-User Signaling field in the conversation initiating protocol message switching priority parameters, convert invitation message again to and send to the IP Multimedia System core net.
6, as the method for claim 1,2 or 3 described core network processing terminal handoff request, it is characterized in that the handoff request of accepting or refuse terminal selectively according to the switching priority parameters of assessment result and terminal to report among the step B specifically may further comprise the steps:
The threshold value of switching priority parameters is set, and switching priority parameters and the threshold value that will upload compare, core-network side defines rejection probability according to comparative result and assessment result again, and accepts or refuse the handoff request of terminal selectively according to rejection probability.
7, the method for core network processing terminal handoff request as claimed in claim 6 is characterized in that, core-network side definition rejection probability specifically comprises:
Under identical present load situation, be less than or equal switching the little set rejection probability of handoff request of priority parameters to switching the big set rejection probability of handoff request of priority parameters; Switching under the identical situation of priority parameters, the light set rejection probability of present load is being less than the heavy or set rejection probability of load limit to load.
8, the method for core network processing terminal handoff request as claimed in claim 6 is characterized in that, core net during the handoff request of receiving terminal, further comprises after the step B selectively:
Core net is carried out the handoff request of terminal, and discharges the resource that this switching is occupied after switching is finished.
9, a kind of system of core network processing terminal handoff request, this system comprises terminal, current network, objective network, core net is characterized in that,
Terminal is used for initiating handoff request to objective network, and obtains the switching priority parameters according to the quality of current network and objective network, and described switching priority parameters is uploaded to core net;
Core net one side comprises control unit, is used for present load is assessed, and the handoff request of terminal is accepted or refused to the switching priority parameters of uploading according to assessment result and terminal selectively again.
10, the system of core network processing terminal handoff request as claimed in claim 9, it is characterized in that, described terminal comprises application module, be used to be provided with the threshold value of current network and objective network, and the network quality of current network and objective network is marked according to described threshold value, and calculate the difference of obtaining current network and objective network quality score, obtain the switching priority parameters corresponding again with described difference.
11, as the system of claim 9 or 10 described core network processing terminal handoff request, it is characterized in that, described control unit is further used for being provided with the threshold value of switching priority parameters, and the switching priority parameters and the threshold value that will report compare, again according to comparative result and assessment result definition rejection probability.
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| CN102202375A (en) * | 2010-03-25 | 2011-09-28 | 中兴通讯股份有限公司 | Method and system for controlling MTC (Machine Type Communication) equipment access and transceiving data |
| US8589498B2 (en) * | 2010-04-15 | 2013-11-19 | Avaya Inc. | Phase based prioritization of IMS signaling messages for overload throttling |
| CN102934486B (en) * | 2010-06-01 | 2016-06-29 | 日本电气株式会社 | The call Admission Control method of base station, mobile communication system and base station and call Admission Control program |
| CN104010318B (en) * | 2013-02-22 | 2018-05-11 | 华为技术有限公司 | The method and apparatus of transmission services |
| WO2017124218A1 (en) * | 2016-01-18 | 2017-07-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Method, apparatus and device for transfer between different networks |
| CN105897462A (en) * | 2016-03-25 | 2016-08-24 | 宇龙计算机通信科技(深圳)有限公司 | Data transmission processing method and apparatus, and terminal |
| CN110611690B (en) * | 2018-06-15 | 2022-05-10 | 上海诺基亚贝尔股份有限公司 | Method for master core device reselection, remote device and computer readable medium |
| CN110958651B (en) * | 2018-09-26 | 2022-06-14 | 成都鼎桥通信技术有限公司 | Core network reselection method and device |
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