CN101296511B - Wireless isomer network vertical switch control method based on conversation edge control equipment SBC - Google Patents
Wireless isomer network vertical switch control method based on conversation edge control equipment SBC Download PDFInfo
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Abstract
The invention relates to the mobile communication field, in particular to a method for controlling the vertical switch of a wireless heterogeneous network based on a session border controller (SBC) in an application layer mobility management technology. The method aims at the application of a multi-model mobile terminal in the multimedia services of the heterogeneous network, the SBC is utilized as a fixed mobile anchor point, an SIP protocol is adopted as a mobility management protocol, then the rapid vertical switch of the multimedia services of the multi-model mobile terminal among wireless heterogeneous networks such as GSM, WLAN and 3G, etc. is realized by the alternation of standardized and extended SIP signaling between two SIP function entities, namely, mobility management client terminal disposed in the multi-model terminal and the mobility management server disposed in session boarder controller, thereby reducing micro-mobile vertical switch delay and packet loss rate.
Description
Technical field
The invention belongs to moving communicating field, relate to the application layer mobile management, relate in particular to a kind of wireless isomer network vertical-switching control method in the multi-module mobile terminal multimedia service based on border session control equipment (SBC).
Background technology
Be accompanied by the develop rapidly of the communication technology and constantly bringing forth new ideas of wireless access technology; The access means of next generation wireless network are abundanter; The deployment of the network integration and planning are complicated more; Multiple wireless access finishes and the standard coexistence, and complementary formation organic whole provides ubiquitous information communication service ubiquitous, at all times for the user jointly.Therefore, deep reform also takes place in the mobile management technology thereupon, should support the user to cross over isomerization access network, crosses over various network operator, the moving of different service provider, and guarantees user's seamless service visit and optimal service experience.Switching always is one of key technology in the mobile management, in the network environment of ubiquitous, isomery, the switching controls technology also from the horizontal switched and transferred between the access technology of the same race to the vertical switching the isomery access technology.The vertical switching of crossing over isomerization access network is the research emphasis in the following Ubiquitous Network mobile management, is used to guarantee the session connection property when user's crossover heterogeneous networks moves.Seamless switching is the target of next generation wireless network, and existing seamless switching also only is applicable to homogeneous network environments, realizes that seamless vertical between heterogeneous network is switched to switch with the seamless level of homogeneous environment to have very big-difference, be mainly reflected in following some:
1, stress the variation of access point, and access point changes and might not be moved that the change in physical location that causes causes by the terminal, also possibly caused by the variation of access technology, possibly be static therefore.
2, the vertical switch decision factor physical signalling intensity (RSS, Received Signal Strength) that is not only limited to the terminal and received, because network characterization difference is big before and after switching, internetwork RSS index does not have comparativity.
3, vertical switching is different with the terminal Passive Control mode of network initiation switching in the level switching, allows the user initiatively to initiate switching according to the consideration of individual preference or QoS, and the permission user participates in controlling in the switching.
4, the vertical link layer access technology that relates to multiple isomery of switching; Should guarantee to be independent of the bottom access technology; And the link that level the is switched conversion link layer of being everlasting is realized; Be confined to single wireless access technology, can not adapt to following multimode terminal mobility scene and effectively support the switching between heterogeneous wireless network, therefore become following trend of the times based on the high-rise mobile management of moving agreements such as IP, SIP.
Existing vertical switching implementation method mainly faces the problem of the following aspects:
1, because IPv6 does not also have extensive use, and the most of commercial operation wireless networks of existing IPv4 environment all are to use the private network IP address with overlapping address space, and are connected into core network through the mode of fire compartment wall/NAT.Therefore, realize the vertical crossing problem that just must solve fire compartment wall/NAT that switches of heterogeneous network.
2, owing to high layer-two mobility is not supported in the moving exchanging center MSC in the cellular network, base station etc.; Therefore mobile IP, the vertical handover scheme of Session Initiation Protocol contour level need be introduced new mobile management network elements such as home agent, external agent; Be difficult to make full use of the existing infrastructure of telecommunication and realize seamlessly transitting, and lack vertical handover management mechanism multimode terminal.
3, all there are some defectives in current high-rise vertical handover scheme itself; Then there are bigger switching delay and higher packet loss as moving IP and Session Initiation Protocol; Have a strong impact on vertical performance of handoffs, this is difficult to tolerate in the UDP real-time multimedia business that delay sensitive and service quality (QoS) are had relatively high expectations.
Border session control equipment (SBC) is to be deployed between two service providers' peer-to-peer network or to be positioned at a kind of network equipment that Access Network and core net boundary produce for the border issue that realizes network interconnection intercommunication existence; Work in the access control layer in the soft switch structure; Being the gateway of the IP of speech and multimedia communication to IP in essence, is one of effective and efficient manner of internetwork at present seamless link.SBC is fit to the application scenarios that interconnects between this heterogeneous radio access networks very much, can realize that NAT/Firewall passes through, carrier network topology hiding, safeguard protection, network management and functions such as agreement reparation and intercommunication.SBC generally uses the SIP signaling protocol.SBC network interconnection intercommunication is particularly suitable for as the quick vertical handover management equipment under the heterogeneous wireless network environment with fire compartment wall/NAT power that passes through and the favourable deployed position that is in network boundary; And do not comprise mobile management in the present SBC equipment basic function usually, have certain realistic meaning and feasibility in the vertical switching of smoothly expanding out on the SBC between mobile management function realization heterogeneous network.
Summary of the invention
Technical problem to be solved by this invention provides a kind of wireless isomer network vertical-switching control method based on border session control equipment (SBC); It need not change the structure and the network element deployment of former network; Fast vertical switch of the multimedia service of realization multi-module mobile terminal that can simple and fast between wireless isomer networks such as GSM, WLAN, 3G reduced vertical switching delay and packet loss.
For solving the problems of the technologies described above; Technical scheme of the present invention is as fixing mobile anchor point by the SBC of the widespread deployment on the wireless access network border; Be applied to the multimedia service in the heterogeneous network to multi-module mobile terminal MT (Mobile Terminal); Make full use of SIP signaling flow and the RTP Media Stream agent capability of SBC on network boundary; Level and smooth expansion goes out the mobile management service function; Through the mobile management SIP Signalling exchange of standard and expansion between the mobile management client of disposing at multimode terminal and the mobile management server in the SBC deploy, fast vertical switch of multimedia service between wireless isomer networks such as GSM, WLAN, 3G of realizing multi-module mobile terminal reduced vertical switching delay and packet loss.
In the present invention; Portable terminal MT is a multi mode terminal; The access interface of a plurality of different networks is provided; And supposition MT can insert multiple wireless networks such as WLAN or 3G reliably, and promptly the radio network interface on the MT can be accomplished the link layer switching of corresponding wireless network reliably and can obtain and dispose the information such as the network address of MT in each wireless network, and the IP address obtains and disposes and can realize through modes such as DHCP.
Wireless organizing such as 3GPP, 3GPP2 and MWIF have all determined to adopt the work agreement of SIP as the IP multimedia domain, MMD at present; Target is that all of Internet are successfully served the access that provides ubiquitous; All mobile devices all will comprise a sip user agent in the future, and multi mode terminal has been equipped with sip user agent equally among the present invention.Local core net can be the IMS territory of 3G simultaneously, and Internet public network etc. are comprising the SIP core network.The SIP core net is made up of SIP registrar server, location-server, aaa server, sip proxy server and SIP Redirect Server or the like, and hypothesis can both be in this correct handling for authentication, the log-on message of portable terminal MT.
SBC is deployed in network boundary, as the medium node of subscriber signaling and media session access public network in the wireless private network, is a back-to-back user agent.Its basic framework generally comprises two main functional modules: SIP Xin Lingdaili (SP, Singnaling Proxy) and RTP medium are transmitted (MP, Media Proxy), and note is SBC-SP and SBC-MP respectively.Wherein SBC-SP is responsible for treatment S IP session signaling, and SBC-MP is responsible for Media Stream is controlled, and can use certain protocol and interface to come exchange message between SBC-SP and the SBC-MP.The associated terminal of Correspondent Node CT (CorrespondingTerminal) expression and communication of mobile terminal.
Wireless isomer network vertical-switching control method provided by the present invention comprises following concrete steps:
Step 1, at multi-module mobile terminal installation and moving property administrative client MMC software with at SBC installation and moving property management server software;
In the time of step 2, multi-module mobile terminal start, MMC initiates network selection procedures, obtains the available wireless network state information of position, and selects an only wave point as the work at present wave point;
The sip user agent of step 3, multi-module mobile terminal sends the initialization register requirement to mobile management client MMC; Mobile management client MMC uses the work at present wave point to start initialization registration; Send initialization registration message REGISTER to SBC, subsequent registration, authentication and authentication are accomplished in SBC control;
Mobile management client MMC sends Re-REGISTER message at new wave point to mobile management server MMS;
Mobile management server MMS carries out the position renewal after receiving Re-REGISTER message in the end message storehouse;
Mobile management client MMC carries out processing such as keep-alive or cancellation on demand to former wave point, and periodically sends T-REGISTER message at new wave point;
After step 7, session are set up, wired between mobile management server MMS and mobile management client MMC of the RTP Media Stream between multi-module mobile terminal MT and the Correspondent Node CT or/and the transmission of wireless connections path;
Mobile management client MMC sends a HANDOVER message at new wave point to MMS,
Mobile management server MMS receives after the HANDOVER message that the RTP media stream duplication portion that CT is mail to the former wave point of multi-module mobile terminal mails to new wave point, realizes switching the two of transient process rtp streaming and broadcasting,
After vertical switching was accomplished, mobile management server MMS control RTP Media Stream only mail to new wave point, and does not mail to original wave point, upgrades the end message storehouse simultaneously.
Based on above-mentioned solution, the present invention utilizes SBC as the mobile anchor point on the transmission path between MT and the CT, has not only solved fire compartment wall under the IPv4 environment/NAT crossing problem, has also realized seamlessly transitting of the vertical handover management of heterogeneous wireless network.Simultaneously; Hand off signaling need not mail to the Correspondent Node CT of foreign lands when vertical the switching taken place, and the MMS that only need send on the SBC of this territory just can accomplish handoff procedure, has shortened the signaling transmission path; Significantly reduced switching delay; In switching transient process, broadcast simultaneously, reduced vertical switching packet loss, strengthened performance of handoffs through control realization Media Stream the two of the network address before and after multi-module mobile terminal vertically switches of the use of the MMS on SBC session hook to RTP medium bag.Therefore, the present invention effectively solves based on three subject matters in the vertical switching implementation method.
Description of drawings
Fig. 1 is an application scenarios sketch map of the present invention.
The vertical switching system structure chart of the customer end/server mode that Fig. 2 designs for the present invention.
Fig. 3 is the SBC functional structure chart of the mobile management server of expansion.
Fig. 4 is the mobile management client terminal structure figure among the MT.
Fig. 5 be portable terminal MT respectively between WLAN and 3G network with the communicating by letter and vertical handover procedure figure of communication terminal CT.
Fig. 6 is for implementing the vertical basic flow sheet that switches of heterogeneous network.
Fig. 7 is the sketch map of the vertical switch decision strategy of mobile management client MMC.
Fig. 8 is the initial registration procedure figure of portable terminal.
Fig. 9 is the periodic registration procedure figure of portable terminal.
Figure 10 implements the vertical procedure chart that switches down for holding state.
Conversation procedure figure between the portable terminal MT of Figure 11 and the communication terminal CT.
Figure 12 is the wave point keep-alive procedure chart of mourning in silence.
Figure 13 broadcasts the session hook program execution sketch map that the RTP Media Stream uses for vertical switch dual.
Figure 14 implements the vertical process sketch map that switches in the conversation procedure.
Embodiment
Below to combine accompanying drawing that the present invention is done further detailed description.
As shown in Figure 1; Heterogeneous network is an example with WLAN WLAN and 3G network, establishes among Fig. 1 wireless access network 1 and is 3G network, and wireless access network 2 is a wlan network; When portable terminal MT moves into wireless network 1 and 2 overlapping covered from wireless network 1 overlay area; The vertical switching taken place, switch to wireless network 2 access link from former wireless network 1 access link, MT1 and MT2 are made in MT switching front and back note respectively; The WAP that uses remembers respectively and makes AP1 and AP2 that wireless network 1 uses privately owned address respectively through NAT1 and NAT2 access core net with wireless network 2.Whole vertical handover procedure is accomplished by SBC control.Before and after the vertical switching that in the multimedia communication service process, takes place; The connection of private network side network changes; And the connection of the network between public network side SBC and the communication terminal is constant, accomplishes MT by SBC and is redirected by the signaling and the medium of former Network Access Point to the objective network access point.
Most now Radio Access Networks use private IP address and connect through NAT, and application scenarios of the present invention also is so, and mainly pay close attention to the vertical switching between WLAN and 3G network.What specify is that the present invention is that example describes with WLAN and 3G network; But this instance should not be construed as limitation of the present invention, and the wireless network that GSM, CDMA, 802.15 etc. are inserted based on difference uses SBC etc. to act on behalf of the network environment that equipment interconnects and all is suitable for.
The vertical switching system structure of the customer end/server mode that designs for the present invention shown in Figure 2.In each multimode terminal MT, dispose a mobile management client MMC; Because mobile management client and sip user agent are in together on the MT; The mobile management client can be used as the other cities agencies (Outbound Proxy) of sip user agent; Realize that mobile management and NAT pass through function, whole vertical handover procedure also is transparent to sip user agent.In SBC, on the basis of original SIP Xin Lingdaili, RTP Media proxy, newly dispose a mobile management server MMS.Pass through the mutual and RTP media flow transmission of SIP signaling flow between mobile management client and the mobile management server, guaranteed the accessibility and the session of lasting keep-alive multimedia service of call request when multi-module mobile terminal moves in the IP subnet.
Mobile management server MMS has expanded former SBC function, is in charge of the vertical switching of MT, guarantees that service connectedness and NAT pass through.The mobile management server is as the anchor point of Media Stream, and the Media Stream that transmission over networks is come sends to the related communication terminal, and the Media Stream that also communication terminal is transmitted simultaneously sends to corresponding mobile terminal.When detecting in the time of need switching, the mobile management client will on the new network interface of desiring to switch to, send handoff request to the mobile management server; This handoff request adopts the sip message of expansion to realize; The sip message of this expansion is referred to as mobile management SIP signaling, distinguishes with standard SIP signaling.The soft switching process that utilizes SBC to realize realized by mobile management client and mobile management server-side processes, and to Correspondent Node CT be transparent fully be CT and not know that MT has taken place mobile.While SBC handles all from all SIP signaling and Media Streams of perhaps being directed to UA, and modification IP address and port realize that NAT passes through, and the performance of expanding SBC on this basis is that ten minutes is reasonable, convenient and effective to support vertically to switch.
Shown in Figure 3 is the SBC functional structure of the mobile management server of expansion; SBC still is made up of SBC-SP and two big logic function modules of SBC-MP; The SBC-SP part is made up of standard SIP Xin Lingdaili, mobile management SIP Xin Lingdaili and end message storehouse, and SBC-MP then is made up of media channel controller and RTP medium transponder.The standard sip message of sip user agent is handled by standard SIP Xin Lingdaili, and mobile management SIP Xin Lingdaili then is responsible for handling the mobile management sip message, and the end message storehouse is through coming updating maintenance by SBC-SP to the processing of user's registration message.SBC-SP operates mainly in application layer, the application interface that can use the bottom IP stack to provide.Media channel controller among the SBC-MP accomplishes the duplicating of RTP medium bag, filters, directed or the like function, and RTP medium transponder then is responsible for RTP medium bag is sent to destination address.
Shown in Figure 4 is mobile management client terminal structure among the MT.The mobile management client obtains relevant informations such as the Interface status (like active, free time, un-activation, dormancy etc.), IP address of the current configurations of each radio network interface such as bottom WLAN, 3G, GSM through operating system, and by the wave point information management module these information is managed.But need exchange SIP signaling or transmission and receiving media stream according to the only interface of the policy selection that the switch decision policy module provides in a plurality of radio network interface time spent.These strategies can rate Network Based, QoS, RSS or the like.The mobile management client is used same port to send the SIP request and is received sip response.In vertical handover procedure, the packet that the control of mobile management client is sent and received, the IP address of processing distinct interface and port etc.
Shown in Figure 5 be portable terminal MT respectively between WLAN and 3G network with the communicating by letter and vertical handover procedure figure of communication terminal CT.Comprise in this process: MT moves to the switching of WLAN and moves to two handoff procedures of switching of 3G network from WLAN from 3G network, and is as shown in Figure 7:
1:MT and CT are carrying out session through SBC on 3G network;
2:MT moves in the wlan network and switches, and at first the Dynamic Host Configuration Protocol server of MT and WLAN carries out the registration process of DHCP;
3:MT sends hand off signaling to SBC and vertically switches;
Need send Re-REGISTER message to SIP registrar server after 4:MT switches and carry out the position renewal;
5: handover success, MT pass through SBC and CT session in wlan network;
6:MT moves to from WLAN the GPRS attaching process takes place the 3G network;
7:PDP context activation process;
8:MT sends hand off signaling to SBC and vertically switches;
Need send Re-REGISTER message to SIP registrar server after 9:MT switches and carry out the position renewal;
10: handover success, MT pass through SBC and CT session in 3G network;
Shown in Figure 6ly vertically switch basic flow sheet for heterogeneous network.As shown in Figure 6; MMC carries out vertical switch decision in the mobile management client; After multi-module mobile terminal MT has accomplished the switching and the acquisition of link layer and disposed new IP address, then initiate application layer and vertically switch, be i.e. step 601 by mobile management client MMC; Then, step 602, mobile management client MMC will send hand off signaling to mobile management server MMS according to vertical switching type decision.If the vertical switching under the holding state, then execution in step 603, and mobile management client MMC sends Re-REGISTER message to mobile management server MMS on new wave point, realize the position renewal; If the vertical switching in the conversation procedure, then execution in step 604, and mobile management client MMC sends HANDOVER message to mobile management server MMS on new wave point, and Media Stream is redirected before and after switching.The mobile management server is received execution in step 605 after Re-REGISTER or the HANDOVER message, carries out corresponding hand-off process such as stored position information, carries out being redirected of Media Stream or the like, and send 200OK message to mobile management client MMC.Step 603 and step 604 are following with further describing.
Be illustrated in figure 7 as the sketch map of the vertical switch decision strategy of mobile management client MMC.Vertical switch decision is carried out by mobile management client MMC with initiating.Various physical-layer techniques in the heterogeneous wireless network can produce the different received signal strength signal intensity.In homogeneous network; MT can switch the zero hour according to receiving the RSS decision usually; But detect decision mechanism as the network of MT between heterogeneous network at RSS; If it is very fast that switching changes, and MT vertical switching of execution immediately after finding new wireless network, can cause " ping-pong " in the zone of two different access points overlapping regions so.Because handoff protocol SIP is a kind of application layer protocol, be applied on the complete IP network, therefore traditional relatively link judgement, the present invention increase the QoS, flow, Congestion Level SPCC of network layer etc. as the judgement factor.Personal like in addition, the rate situation also all can be used as the judgement factor of mobile management client.Above-mentioned each judgement factor is given corresponding tactful coefficient, and comprehensive back forms vertical switch decision strategy.
Mobile management client MMC in the portable terminal obtains the parameter of the different levels such as signal to noise ratio, link energy consumption parameter, effective bandwidth of physical layer, link layer, network layer through operating system, each judgement factor parameter accounts for certain weight λ respectively
iPredict following stable state according to the statistics of nearest end, calculate the wireless network expense function F of switching front and back through method to employings comprehensive strategic coefficient weightings such as physical layer, link layer and network layer parametric data and personal like, tariff data
n, and result of calculation transferred to mobile management client switch decision, if the wireless network expense function F of certain wave point
nIn stationary phase,, then trigger vertical handover procedure to this wireless network always less than current wireless network expense function.
I, following to the step 603 among Fig. 6, promptly the vertical handover procedure under the holding state further describes.
The vertical switching of vertical switching under the holding state needs the support of location management, and location management comprises the core mechanism of initial registration procedure and these two kinds of location managements of cycle registration process.
Be illustrated in figure 8 as the initial registration procedure of portable terminal.Initial registration procedure is initiated by the sip user agent among the MT, and UA sends register requirement through the current active network interface of MT to SIP registrar server.This message sends to mobile management client MMC by UA; Be transmitted to mobile management server MMS by mobile management client MMC again, thereby set up the association between the network address information such as user terminal identification (the available terminal number is as terminal iidentification) and wave point IP in the end message storehouse in MMS.The network address here is IP address, port of MT the private network IP address, port and the NAT that in network, distribute etc., can from SIP-URI and UDP header, obtain.On behalf of portable terminal MT, the mobile management server log-on message is transmitted to SIP registrar server again, and upgrading this mobile terminal identification corresponding address is the SBC address.SBC itself has the Contact header field function of revising in the sip message, the SBC address is revised as in the contact address is transmitted to SIP registrar server again and gets final product.Since then have only the mobile management server can follow the tracks of moving of MT, and SIP registrar server is only known the IP address of this MT address for this SBC, and do not know the mobility of MT in ownership SBC scope.
The initialization registration also comprises simple terminal authentication.SBC carried out transmitting this registration message to sip server after the simple modification when MT sent registration message for the first time; 401 message that sip server is responded band www-authentication field require terminal authentication; The registration message second time of the request authentication mandate of band authorization field is sent at the terminal in the MT registration message second time, and SBC preservation relevant information is transmitted to sip server and carries out authentication, if through authentication, sip server is responded 200OK message.
Shown in Figure 9 is the periodic registration procedure of portable terminal.Portable terminal need be on current active wave point periodically to the SBC registration, with this position of confirming portable terminal with carry out NAT and pass through.Concrete implementation method is that the mobile management client was whenever sent a T-REGISTER message to the mobile management server at a distance from 30 seconds; Be called the cycle login mechanism; After the mobile management server is received this T-REGISTER message, respond 200OK message to the mobile management client.This mechanism guarantee mobile phone users can be in keep-alive on the SBC its IP address and port address that on NAT, shines upon; Thereby penetrate the user private network address information that provides up-to-date, the position that makes SBC learn that current mobile terminal moves the simultaneously line trace of going forward side by side for Multimedia session.Can realize that through the cycle registration message of mobile management client the location management in the mobile management upgrades as realizing the position, is the vertical information such as address that provide necessary of switching.The cycle registration process only occurs between mobile management client and the mobile management server, does not need the sip user i.e. participation of generation on SIP registrar server and the MT, and is periodically initiated by the mobile management client.The IP that wherein carries among the T-REGISTER message SIP-URI is the IP that enlivens radio network interface of current this message of transmission of MT.Mobile management server among the SBC is known portable terminal MT latest position information as in the scope of which network coverage like this, the Care-of Address in this network etc.
The procedure chart of implementing vertical switching for holding state down shown in figure 10.The handoff procedure of wave point is controlled by the mobile management client; Vertical switch take place before, MT is under the holding state, through position new management more; The current available netting twine network interface of portable terminal MT is an interface 1, communicates by letter on wave point 1 with the mobile management server.When sessionless vertically switches generation; MT has selected new radio network interface 2; And on this interface 2, send SIPRe-REGISTER message and register again to this network; The IP address of mobile management server update portable terminal MT, behind the radio network interface 2 of the current use of record portable terminal MT, the mobile management server of SBC carries out the correct route of current location to the conversation request that mails to portable terminal MT.Afterwards, the cycle registration process that mobile management client activates on the new wave point 2 deactivates the cycle registration process on the former wave point simultaneously.The mobile management client is switched back communication on wave point 2 before switching.
II, following to the step 604 among Fig. 6, promptly the vertical handover procedure in the conversation procedure further describes.
Conversation procedure has been described signaling and the link circuit condition when the multimode terminal session is set up; Simultaneously owing to many interfaces of multimode terminal can be used; When using one of them interface to carry out session, other wave point of mourning in silence also must be realized the accessibility of this access point through the keep-alive process.Vertical switching in the conversation procedure is current session interface to be connected the some suitable wave point of mourning in silence available of transferring to switch decision connect.
Conversation procedure figure between portable terminal MT shown in Figure 11 and the communication terminal CT.Call setup all is the SIP flow process of standard with calling out to discharge in the conversation procedure, and is shown in figure 11, and the transmission of Media Stream is transmitted through anchor point SBC agency.Portable terminal MT receives and dispatches sip message on the radio network interface of selecting; Because the mobile management server among the SBC has write down the current wireless interface that this MT selects in registration process and position updating process, the relevant SIP signaling of route in call setup that therefore can be correct.Signaling flow is transmitted through the SBC agency between MT and the communication terminal CT.SBC need revise SDP when INVITE was with 200OKToInvite message in handling call establishment, set up and upgraded the address mapping table that RTP transmits, thereby act on behalf of as the RTP of both sides' Media Stream communication.Call out in a single day and set up, the medium bag will transmit on the wave point of selecting.BYE and ACK message do not need SBC to carry out the modification of SDP when calling out release, transmit after the route to get final product.In the time of session, the current selection radio network interface of MT is wave point M such as 3G interface, and SBC and MT all carry out media delivery on the link channel M of current selection.Current available wireless network interface wireless interface N such as WiFi interface then send the keep-alive of mourning in silence of dummy argument bag on the link channel N that mourns in silence, see the wave point keep-alive process of mourning in silence.Possibly there are a plurality of available link passages in SBC and MT according to actual conditions.After the link establishment between SBC and the MT whether vertical switching taking place in conversation procedure does not change.
The wave point keep-alive process of mourning in silence shown in figure 12.For the MT that in heterogeneous networks overlapping covered, moves,,, all be in silent status though the wave point of other area of coverage network is available owing to have only the active wave point of a current selection in the overwhelming majority times.Be to guarantee that communication is smooth in the conversation procedure, behind the call setup, by the mourn in silence keep-alive process of wave point of the mobile management client terminal start-up among the MT.The mobile management client is sent keep-alive message to the mobile management server on the available wireless network interface of mourning in silence.Keep-alive message should not consume too many Internet resources, gets final product with dummy argument UDP bag.The mobile management server directly abandons these dummy argument bags after receiving these bags, but still can learn that these wave points can use, to prevent occurring big packet loss vertical the switching time.
Vertical handover procedure is to be in that MT in the Multimedia session is needed to use new network interface to communicate by the MT judgement when moving to new network's coverage area and the access network from original use of initiating is transferred to the target access network network of isomery and still can guarantee the handoff procedure that session is unimpeded.Because hand off signaling message exchanges in objective network,, the communication therefore in the former network still can carry out even interrupting suddenly switching.
SBC adopts the two working mechanisms of broadcasting of RTP Media Stream to the vertical switching in the conversation procedure among the present invention, depends on the session hook program among the SBC during realization, and vertical switch dual shown in figure 13 is broadcast the session hook program execution sketch map that the RTP Media Stream uses.When the user initiated a session request, SBC-SP sent the media channel assignment commands to SBC-MP, and SBC-MP is used for the forwarding of RTP Media Stream for this user distributes a pair of address, and this address was passed through message informing communicating pair such as 200OK.When having set up the SIP session, SBC-SP sends the media channel activation command to SBC-MP makes SBC-MP can correctly carry out the forwarding of Media Stream.When mobile subscriber's HANDOVER hand off signaling arrived SBC-SP, SBC-SP upgraded the end message storehouse, and sent the network address after media channel update command control RTP Media Stream is directed to user's renewal to SBC-MP.In vertical handover procedure, the renewal of media channel will trigger the operations such as duplicating, filter, be redirected of SBC-MP to conversation media stream.SBC will insert the session hook according to Call-ID in the Media Stream of respective session after receiving HANDOVER message; All can be intercepted and captured when each RTP bag of this road conversation media stream is through SBC afterwards by the session hook; And carry out the control decision and the execution of this bag by it; These comprise that the IP address before and after switching all sends RTP bag copy or only transmit the RTP bag to switching IP address, back; Or this RTP bag carried out buffer memory and rebuild route, the heaviest multi-module mobile terminal that mails to of guaranteeing that each RTP can both be correct.Multi-module mobile terminal will filter the duplicate packages of receiving, like the RTP bag of same sequence number, MMC gives the upper strata with the bag of receiving earlier and handles, and the bag of then receiving will directly abandon.
Implement the vertical process sketch map that switches in the conversation procedure shown in figure 14.After starting vertical handover procedure, MT is immediately at the sip message HANDOVER that sends expansion on the objective network interface its session identification that will switch of mobile management server notification to the SBC.MT begins on two interfaces, to duplicate the medium bag that mails to CT simultaneously.If detect former radio network interface inactivation then need on this interface, not duplicate the medium bag this moment.In a single day the last mobile management server of SBC receives HANDOVER message, will accomplish following affairs:
1. begin to receive medium bag, and abandon medium bag from former interface according to the Call-ID in the HANDOVER message body from new interface;
2. upgrade RTP forwarding address correspondence table, revise NAT continuous item data.
3. respond 200OK message to the mobile management client of MT;
4. begin to send the medium bag to the new network interface of MT.
Because MT has begun to send bag with new interface to the mobile management server of SBC when switching, so handover delay is very little.Because influencing factor is more under the wireless environment,, can when not receiving 200OK, implement retransmission mechanism according to the SIP standard for the reliability of the sip message HANDOVER that guarantees expansion.By the SIP standard recommendation value retransmission time out time is 500ms, afterwards multiplication successively.Consider the real-time of IP multimedia service, forcing the retransmission time out time down at vertical handoff environment is 200ms, and maximum number of retransmissions be 15 times be that the affairs time-out time is 3 seconds.
Mobile management client among the MT is duplicated the medium bag simultaneously stopping under two kinds of situation on two wave points: correctly receive 200OK message or on new wave point, receive first conversation media bag.Latter event is to guarantee under the 200OK information drop-out is but received the abnormal conditions of medium bag, still can accomplish vertical switching.This moment the mobile management client continue to the mobile management server send HANDOVER message up to overtime to guarantee enough reliabilities.
Radio network interface originally or inactivation become useless interface, or becoming the available interface of mourning in silence carries out the wave point keep-alive process of mourning in silence.
HANDOVER message sends to the mobile management server by the mobile management client, and the session identification Call-ID that mainly will switch notifies to SBC.After receiving, SBC carries out above-mentioned handled.HANDOVER message illustration is following:
Wherein 10.0.0.34 is for switching the private network IP that the back wireless network distributes; 222.20.5.100 for switching the NAT IP address of back Wireless IP network; 192.168.0.34 private network IP for wireless network distribution before switching; 222.20.5.200 the NAT IP address of Wireless IP network before switching, 222.20.5.136 is the IP address of SBC.The session identification of Call-ID for need vertically switching still uses the vertical preceding Call-ID that switches.SBC can be redirected for this road conversation media stream after learning Call-ID.Old-Link is a new field, is the situation of the communication link between MT before switching and the SBC.
The above vertical handoff method is particularly suitable for the vertical switching under the heterogeneous wireless network environment.When portable terminal MT in the mobile administrative domain of boundary Control equipment SBC vertical moving takes place, just can realize the vertical switching between heterogeneous network through the Signalling exchange between mobile management client on the MT and the mobile management server end on the SBC based on C/S model.With handoff procedure in the conventional method with switch back home network registration process and be incorporated in the process and accomplish, only need need not register, thereby compressed switching flow to home network to the SBC agency of trademark registration.When upgrading, the position also preserves the network address of MT by SBC; Thereby SBC has shielded the mobile relevant information of MT, as far as the foreign lands user, only knows that MT is in the mobile administrative domain of this SBC; And do not know that whether MT is moved and current specific address, has effectively protected the portable terminal privacy.Adopt the method for the wave point keep-alive of mourning in silence to guarantee the effective seamless access at terminal to multimode terminal in the conversation procedure.Adopt the method for soft handover in the vertical handover procedure; Media Stream is two during switching broadcasts the effective packet loss that reduced, and hand off signaling HANDOVER message only need send to the SBC on this territory network boundary simultaneously, sends to the home network mobile agent or the Correspondent Node of foreign lands relatively; Effectively reduced the signaling transmission range; Thereby bring less relatively handover delay, thereby quickened vertical handover procedure, have vertical preferably performance of handoffs.
Claims (1)
1. wireless isomer network vertical-switching control method based on border session control equipment SBC is characterized in that may further comprise the steps:
Step 1, at multi-module mobile terminal installation and moving property administrative client MMC software with at SBC installation and moving property management server MMS software;
In the time of step 2, multi-module mobile terminal start, MMC initiates network selection procedures, obtains the available wireless network state information of position, and selects a wave point as the work at present wave point;
The Session initiation Protocol sip user agent of step 3, multi-module mobile terminal sends the initialization register requirement to mobile management client MMC; Mobile management client MMC uses the work at present wave point to start initialization registration; Send initialization registration message REGISTER to SBC, subsequent registration, authentication and authentication are accomplished in SBC control;
Step 4, all available radio interface of mobile management client MMC control are carried out periodic registration or interface keep-alive; Send heartbeat message UDP UDP dummy argument bag or periodic registration message T-REGISTER to mobile management server MMS; Periodic registration message comprises IP and the port of current wireless interface, IP and the port address of NAT NAT, and mobile management server MMS is the maintenance terminal information bank in view of the above;
Step 5, if when being in the multi-module mobile terminal generation vertical moving of holding state, MMC is through initiating the vertical handover procedure under the holding state to mobile management server MMS behind the switch decision; Vertical handover procedure under this holding state comprises:
Mobile management client MMC sends Re-REGISTER message at new wave point to mobile management server MMS;
Mobile management server MMS carries out the position renewal after receiving Re-REGISTER message in the end message storehouse;
Mobile management client MMC carries out keep-alive to former wave point or nullifies and handle, and periodically sends T-REGISTER message at new wave point;
Step 6, receive external when mailing to this multi-module mobile terminal user calling request message as mobile management server MMS; Mobile management server MMS inquiry terminal information bank; The wave point of the current use of multimode terminal is mail in the INVITE request, thereby set up session by the SIP call setup flow process of standard;
After step 7, session are set up, wired between mobile management server MMS and mobile management client MMC of the realtime transmission protocol RTP Media Stream between multi-module mobile terminal MT and the Correspondent Node CT or/and the transmission of wireless connections path;
Step 8, if during multi-module mobile terminal generation vertical moving, mobile management client MMC is through the vertical handover procedure under mobile management server MMS initiation session state behind the switch decision; Vertical handover procedure under this session status comprises:
Mobile management client MMC sends a HANDOVER message at new wave point to MMS,
Mobile management server MMS receives after the HANDOVER message that the RTP media stream duplication portion that CT is mail to the former wave point of multi-module mobile terminal mails to new wave point, realizes switching the two of transient process rtp streaming and broadcasting,
After vertical switching was accomplished, mobile management server MMS control RTP Media Stream only mail to new wave point, and does not mail to original wave point, upgrades the end message storehouse simultaneously.
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| CN101815026B (en) * | 2009-02-24 | 2012-02-29 | 北京中京创原通信技术有限公司 | IP telecommunication network system address registration method based on non-conversational mode |
| CN101808366B (en) * | 2010-02-05 | 2012-08-08 | 西安电子科技大学 | Cognitive-based heterogeneous network resource management system and management method thereof |
| CN102186244B (en) * | 2011-05-31 | 2013-09-25 | 电子科技大学 | Wireless heterogeneous network system and uniform position management method for wireless heterogeneous networks |
| CN103916977B (en) * | 2013-01-08 | 2018-12-04 | 大陆汽车投资（上海）有限公司 | The method of controlling terminal connection short-distance radio network |
| CN104348784A (en) * | 2013-07-29 | 2015-02-11 | 携程计算机技术（上海）有限公司 | Registration control method of mobile terminal for accessing call center and system thereof |
| CN105790903A (en) * | 2014-12-23 | 2016-07-20 | 中兴通讯股份有限公司 | Terminal and terminal call soft handover method |
| CN108243162B (en) * | 2016-12-26 | 2020-12-04 | 大唐移动通信设备有限公司 | SIP (Session initiation protocol) registration method and device |
| CN110381555B (en) * | 2019-08-12 | 2021-05-28 | 江苏传艺科技股份有限公司 | Data transmission switch management system for 5G terminal |
| CN112231122B (en) * | 2020-10-27 | 2024-08-13 | 南京林洋电力科技有限公司 | APP management method based on heterogeneous communication model and oriented to terminal software platform |
| CN112615839B (en) * | 2020-12-10 | 2023-08-22 | 帝信科技股份有限公司 | Data transmission system, data transmission method and data transmission device |
| CN112929208B (en) * | 2021-01-25 | 2022-02-11 | 浙江大学 | Isomerous body decision method of mimicry virtual switch |
| CN113055398B (en) * | 2021-03-31 | 2022-04-22 | 杭州恒生数字设备科技有限公司 | SIP architecture-based multi-level cross-domain equipment certificate management system |
| CN113905370B (en) * | 2021-08-26 | 2023-07-11 | 国网浙江省电力有限公司宁波供电公司 | Safe starting method for discrete 5G network boundary equipment |
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