CN104469943A - Paging method and mobile switching center - Google Patents

Abstract

The invention provides a paging method and a mobile switching center. The method includes the steps of: after receiving a called business request, initiating paging a terminal in a circuit domain switching network; and during a paging process, if it is judged that the terminal is transferred to a systematic framework evolution network, paging the terminal through an SGs interface. According to the paging method and the mobile switching center, addition of paging through the SGs interface is permitted during a circuit domain paging process of an MSC/VLR (Mobile Switching Center/Visitor Location Register), so that the paging failure problem caused by roaming of UE in different networks is overcome, and the called business success rate of the UE in the hybrid network of the circuit domain switching network and an SAE network is increased.

Description

A kind of paging method and mobile switching centre

Technical field

The present invention relates to communication field, particularly relate to a kind of paging method and mobile switching centre.

Background technology

SAE (system architecture evolution) network is 3GPP (3rd Generation Partnership Project, third generation partner program) the new generation of wireless network technology in order to alternative traditional circuit domain switching network organized to set up, it comprises LTE (Long Term Evolution, Long Term Evolution) and EPC (EvolvedPacket Core, the packet-based core networks of evolution), as shown in Figure 1, the function of each network element illustrates its framework as follows.

Subscriber equipment (User Equipment, be called for short UE), have and can access UTRAN/GERAN (Universal Mobile Telecommunication System Radio Access Network/GSMEDGE Radio Access Network, global system for mobile communications wireless access network, refer to GPRS (General Packet Radio Service, GPRS) wireless network, UTRAN represents 3G, and GERAN represents 2G) and the ability of LTE two kinds of wireless networks.UE, due to capabilities limits and energy saving requirement, can only reside in a wireless system (being called SingleRadio) in the same moment, such as when UE resides under LTE time, now cannot receive beep-page message from UTRAN/GERAN.

Evolution radio node (evolved NodeB is called for short eNodeB), can provide the up-downgoing speed higher than UTRAN, lower transmission delay and more reliably wireless transmission on eating dishes without rice or wine.The access that eNodeB is terminal provides Radio Resource, simultaneously and set up the link of S1 chain of command between core net MME.

Mobility Management Entity (Mobility Management Entity, be called for short MME), it is a chain of command entity, the server of interim storage user data, be in charge of and store UE context (such as UE/ user ID, mobility management states, user security parameters etc.), for user distributes temporary mark GUTI (Globally Unique Temporary Identity, whole world unique temporary identity), MME was responsible for user and carries out authentication to user from LTE accesses time.

SAE gateway (SAE Gateway, System Architecture Evolution GW is called for short SAEGW), is a user entity, is responsible for user face data route processing.SAE GW is generally divided into gateway (Serving GW) and packet data network gateway (PDN GW), and Serving GW is responsible for ambulant anchor point between LTE and UMTS, and under idle condition, downlink data triggers MME and SGSN paging; PDN GW is responsible for the gateway function that UE accesses PDN (Packet Data Network, Packet Data Network), is user distributing user IP (Internet Protocol, Internet protocol) address.PDN GW and Serving GW may close and be located in a physical entity.

HSS (Home Subscriber Server, home subscriber server), for preserving the subscription data of user, the MME title (MME NAME) at recording user place simultaneously.

Fig. 1 gives the framework of traditional circuit domain switching network simultaneously.Wherein, core network element has mobile switching centre's (Mobile Switching Center is called for short MSC) and VLR Visitor Location Register (VisitorLocation Register is called for short VLR), MSC and VLR is physically generally combined.

3G Radio Access Controller (Radio Network Controller is called for short RNC) or base station controller (Base Station Controller is called for short BSC), be responsible for the wireless activity of control and management user.

Traditional circuit domain switching network uses attaching position register (Home Location Register is called for short HLR) to preserve the CAMEL-Subscription-Information of user and the address of VLR.In called calling, HLR can obtain the animated walk-through number (Mobile Subscriber Roaming Number is called for short MSRN) of user from VLR.In FIG, HLR and HSS is served as by a physical NE.

Gateway MSC (Gateway Mobile Switching Center is called for short GMSC) is for routing the call to the MSC at user place.When there being the calling to mobile subscriber, GMSC obtains the MSRN of user, then according to MSRN routing call by HLR.

Between the MME network element and the VLR of traditional circuit domain switching network of SAE, connected by SGs interface, SGs interface is the interface between MME and MSC, and it is long-term trend that SAE network substitutes traditional circuit domain switching network.In this process, because traditional circuit domain switching network wireless coverage is better, serve comparatively stable, so it is effectively supplementing of SAE network.When SAE cannot provide satisfied traditional voice service, can transfer to provide regarding service by traditional circuit domain switching network.This mechanism returning back to traditional circuit domain switching network is called circuit switching fall-back technology (Circuit SwitchFallback, be called for short CSFB), the UE that traditional circuit domain switching network carries out business can be fallen back to and be called bimodulus single-frequency UE (Dual Mode Single Radio UE).CSFB technology, between the MME and the VLR of traditional circuit domain switching network of SAE, builds SGs interface.By this interface, MME can allow the UE roamed under LTE trigger the position update flow of traditional circuit domain switching network, thus makes UE while SAE activity, registers at traditional circuit domain switching network.This process comprises the steps:

UE under step 201, LTE starts shooting or changes tracking area (Tracking Area is called for short TA), initiates start (ATTACH) or tracing section updating (Tracking Area Update is called for short TAU) and operates;

Step 202, MME receive above-mentioned message, carry out the registration to HSS in SAE.

Step 203, succeed in registration after, MME, by the tracking area at UE place, derives the lane place of UE in traditional circuit domain switching network (Location Area Identity is called for short LAI), and navigates to corresponding VLR.By SGs interface, MME sends position updating request to this VLR.

If step 204 VLR does not have user data, or VLR thinks that user data is unreliable, and VLR sends position updating request to HLR.

Step 205, HLR will send ISD (insertion user data requests) to VLR, VLR recording user subscription data, and return response.

The successful respond that step 206, HLR home position upgrade, the number of recording user place VLR.

Step 207, VLR home position have upgraded message to MME, and by the status modifier of SGs interface for activating.

User is after HLR registration, and the upper SGs interface status flag to user of MSC/VLR is for activating, and follow-up when receiving called service like this, MSC/VLR judges this state, carries out paging by SGs interface to user.This process is see Fig. 3, and concrete step comprises:

Step 301, GMSC are receiving the IAM of outer net (Initial Address Message, initial address message) after, called HLR is found according to called MS ISDN number (i.e. subscriber directory number), and send SRI (Send Routing Information to HLR, obtain routing iinformation) request, the inside is with the Mobile Subscriber International ISDN Number of user.

The MSC/VLR number that step 302, HLR find user to register according to Mobile Subscriber International ISDN Number, and send PRN (Provide Roaming Number to this MSC/VLR, Provide Roaming Number) request, now MSC/VLR is the MSC/VLR that UE registers from LTE/EPC.MSC/VLR distributes interim subscriber identity MSRN, and returns to HLR.This MSRN unique identification MSC/VLR and called UE.

Step 303, HLR return SRI and respond to GMSC, band MSRN.

So step 304, GMSC route the call to MSC/VLR according to MSRN.

Step 305, MSC/VLR check that the SGs Interface status of user is for activating, and initiates CS (circuit domain) paging from SGs to MME, so MME initiates CS paging in LTE inside, and return service request to MSC/VLR;

Step 306, UE return back to circuit domain, initiate to page reply from traditional circuit domain switching network;

If step 307 needs, MSC/VLR carries out access operation;

Setup requests Setup is sent to UE by step 308, MSC/VLR;

Step 309, MSC/VLR, UE complete remaining called process of establishing.

In above process, complete the user of SGs registration, by SGs interface paging, accept called service.But there is following scene, user just roams into LTE network in paging, cause MSC/VLR correctly cannot initiate paging, therefore user misses when time called service.This scene comprises the steps:

Step 401, user is initial resides in circuit domain switching network, and therefore the SGs Interface status of this user is idle:

Step 402, user receive and ask into calling for, because the SGs Interface status of this user is idle, so MSC/VLR initiates paging in circuit domain to user;

Step 403, user, before receiving paging request, roam, and become from LTE network access, and initiating updating of tracking area:

Step 404, user cannot receive paging request owing to changing access network, the paging time-out that MSC/VLR initiates, calling release.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of paging method and mobile switching centre, to solve the paging failure problem that UE causes at heterogeneous networks internetwork roaming.

In order to solve the problems of the technologies described above, the invention provides a kind of paging method, comprising:

After receiving called service request, initiate the paging to terminal at circuit domain switching network;

In described paging, as terminal as described in judging has transferred to system architecture evolvement network, then by SGs interface, paging is carried out to described terminal.

Further, said method also has feature below:

In described paging, as received SGs interface position update request message, then judge that described terminal has transferred to system architecture evolvement network.

Further, said method also has feature below: described system architecture evolvement network comprises:

The packet-based core networks of Long Term Evolution or evolution.

In order to solve the problem, present invention also offers a kind of mobile switching centre, wherein, comprise:

First paging module, after receiving called service request, initiates the paging to terminal at circuit domain switching network;

Second paging module, in described paging, as terminal as described in judging has transferred to system architecture evolvement network, has then carried out paging by SGs interface to described terminal.

Further, above-mentioned mobile switching centre also has feature below:

Described second paging module, in described paging, as received SGs interface position update request message, then judges that described terminal has transferred to system architecture evolvement network.

Further, above-mentioned mobile switching centre also has feature below:

Described system architecture evolvement network comprises: the packet-based core networks of Long Term Evolution or evolution.

To sum up, the invention provides a kind of paging method and mobile switching centre, allow MSC/VLR in CS paging process, increase the paging of SGs interface, thus solve the paging failure problem that UE causes at heterogeneous networks internetwork roaming, increase the called service success rate of UE in circuit domain switching network and SAE network hybrid networking.

Accompanying drawing explanation

Fig. 1 is the framework map of SAE and traditional circuit domain switching network in prior art.

Fig. 2 is that in prior art, under LTE, user carries out the flow chart of traditional circuit domain switching network registration.

Fig. 3 is that in prior art, under LTE, user falls back to traditional circuit domain switching network, receives the flow chart that traditional circuit domain switching network enters calling.

Fig. 4 is that in prior art, UE roams into LTE network in the paging, thus causes the flow chart of paging failure.

Fig. 5 is the flow chart of a kind of paging method of the embodiment of the present invention.

Fig. 6 is the flow chart of the paging method of application example of the present invention.

Fig. 7 is the schematic diagram of the MSC of the embodiment of the present invention.

Embodiment

For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.

Fig. 5 is the flow chart of a kind of paging method of the embodiment of the present invention, and as shown in Figure 5, the method for the present embodiment comprises:

S11, receive called service request after, initiate paging to terminal at circuit domain switching network;

S12, in described paging, as terminal as described in judging has transferred to SAE network, then by SGs interface, paging is carried out to described terminal.

Like this, the method of the present embodiment allows MSC/VLR in CS paging process, increase the paging of SGs interface, thus solve the paging failure problem that UE causes at heterogeneous networks internetwork roaming, increase the called service success rate of UE in circuit domain switching network and SAE network hybrid networking.

Fig. 6 is the flow chart of the paging method of the present invention one application example.In this example, MSC/VLR is in called paging process, UE initiating updating of tracking area, and MSC/VLR passes through SGs interface paging thus the process of connecting subscribers participating.Concrete steps are as follows

Step 501, GMSC are receiving the IAM of outer net (Initial Address Message, initial address message) after, called HLR is found according to called MS ISDN (i.e. subscriber directory number), and send SRI (Send Routing Information to HLR, obtain routing iinformation) request, the inside is with the Mobile Subscriber International ISDN Number of user.

The MSC/VLR number that step 502, HLR find user to register according to Mobile Subscriber International ISDN Number, and send PRN (Provide Roaming Number, Provides Roaming Number) request to this MSC/VLR, MSC/VLR returns roaming number to HLR.

The roaming number of acquisition is returned to GMSC by step 503, HLR in SRI Response message.

Step 504, GMSC route the call to MSC/VLR according to MSRN.

Step 505, because user is current resident at circuit domain switching network, so SGs Interface status corresponding to user be idle, MSC/VLR is calling user in circuit domain, and transmission beep-page message is to BSC or RNC.

Step 506, simultaneously, UE roams into LTE network, initiating updating of tracking area under LTE network.

Step 507, MME receive tracing section updating, send SGs interface position update request message to MSC/VLR.

Step 508, MSC/VLR treatment S Gs interface location update message, return SGs interface position and upgrade acceptance.

Step 509, MSC/VLR judge that user transfers to LTE network, initiate SGs interface paging to MME, and wait for that UE falls back to circuit domain switching network.

Step 510, UE return back to circuit domain switching network, initiate to page reply from circuit domain switching network,

If step 511 needs, MSC/VLR carries out access operation.

Setup requests Setup is sent to UE by step 512, MSC/VLR;

Step 513, MSC/VLR, UE complete remaining called process of establishing.

Paging by MSC/VLR, is transferred to LTE network from circuit-switched network, is improve the call completing rate of calling, make network service more satisfactory after receiving LU (location updating) registration request of SGs interface by the present invention.

Fig. 7 is the schematic diagram of the MSC of the embodiment of the present invention, and as shown in Figure 7, the MSC of the present embodiment comprises:

First paging module, after receiving called service request, initiates the paging to terminal at circuit domain switching network;

Second paging module, in described paging, as terminal as described in judging has transferred to system architecture evolvement network, has then carried out paging by SGs interface to described terminal.

Wherein, described second paging module, in described paging, as received SGs interface position update request message, then judges that described terminal has transferred to system architecture evolvement network.

The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

These are only the preferred embodiments of the present invention; certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.

Claims (6)

1. a paging method, comprising:

After receiving called service request, initiate the paging to terminal at circuit domain switching network;

In described paging, as terminal as described in judging has transferred to system architecture evolvement network, then by SGs interface, paging is carried out to described terminal.

2. the method for claim 1, is characterized in that:

In described paging, as received SGs interface position update request message, then judge that described terminal has transferred to system architecture evolvement network.

3. method as claimed in claim 1 or 2, is characterized in that: described system architecture evolvement network comprises:

The packet-based core networks of Long Term Evolution or evolution.

4. a mobile switching centre, is characterized in that, comprising:

First paging module, after receiving called service request, initiates the paging to terminal at circuit domain switching network;

Second paging module, in described paging, as terminal as described in judging has transferred to system architecture evolvement network, has then carried out paging by SGs interface to described terminal.

5. mobile switching centre as claimed in claim 4, is characterized in that:

Described second paging module, in described paging, as received SGs interface position update request message, then judges that described terminal has transferred to system architecture evolvement network.

6. the mobile switching centre as described in claim 4 or 5, is characterized in that: described system architecture evolvement network comprises:

The packet-based core networks of Long Term Evolution or evolution.