CN1466400A

CN1466400A - Communication method for avoiding speech path back haul and network thereof

Info

Publication number: CN1466400A
Application number: CNA02125012XA
Authority: CN
Inventors: 张少波
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2002-06-22
Filing date: 2002-06-22
Publication date: 2004-01-07
Anticipated expiration: 2022-06-22
Also published as: CN1243456C

Abstract

This invention relates to a communication method and network for avoiding channel backhaul including the following steps: a local user B initiates a call routed to GMSC to a panning user A, GMSC sends a request of a route inquiry to RLR which gets the panning number (MSRN) from VLR registered by A at the present to return MSRN to GMSC which sends the call routed to the position MSC of the panning user A. MSC/VLR sends a beeping message to BSC corresponding to the present position of A, in ally a user is beeped by BTS to have the session. Network for realizing such method includes: RLR, GMSC, VLR, MSC, LE and BSC, avoiding backhaul of a channel via called panning user HPLMN.

Description

A kind of communication means and network thereof of avoiding alternative channel

Technical field

The present invention relates to the communications field, relate in particular to communication means and the communication network thereof of avoiding the called alternative channel of roamer in a kind of mobile communication system.

Background technology

Mobile communication is that the communication technology has been brought a big revolution, bring great convenience for popular life, even the user is in the network of strang country's different operators, also can keep in touch with other people easily, if but the user roams into other networks when called, tend to exist the phenomenon of alternative channel, typical example is that the user roams into another one country by the situation of this national customer call.

For the handshaking procedure of this kind phenomenon clearly is described, roam into the problem of the situation explanation alternative channel of other countries below with the user, please referring to international nomadism call process shown in Figure 1.

Might as well suppose mobile subscriber A from national X, roam into another national Y, if the situation of the user B of national Y (fixing or mobile) when calling out roamer A supposes that again user B is a fixed-line subscriber.

(1) user B calls out roamer A, and local switch LE (Local Exchauge) carries out number analysis, finds that this is international call, delivers to the international gateway ITE1 (International Transit Exchange) of Y state;

(2) ITE1 determines the destination country of calling by further number analysis, calls out the international gateway ITE2 that is sent to X state;

(3) to go out through number analysis be mobile calls to ITE2, and nearest gateway MSC GMSC (Gateway Mobile Switching Center) is delivered in this calling;

(4) gateway MSC GMSC finds the attaching position register HLR (Home Location Register) of user A by analyzing number, and sends query requests to it;

(5) the VLR Visitor Location Register VLR of attaching position register HLR and the current registration of user A (Visitor Location Register) sets up contact, request mobile station roaming number MSRN (Mobile Station Roaming Number);

(6) mobile station roaming number MSRN is returned in the request of VLR response HLR, and this number points to the moving exchanging center MSC (Mobile SwitchingCenter) at the Y state current place of user A;

(7) HLR delivers to gateway MSC GMSC to roaming number MSRN;

(8) GMSC carries out number analysis to MSRN, calling is re-routed the ITE2 of X state;

(9) ITE2 of X state routes calls to the ITE1 of Y state;

(10) ITE1 of Y state routes calls to MSC/VLR;

(11) MSC sends out beep-page message to the base station control center BSC (Basic Station Control) of the lane place of registering corresponding to user A;

(12) user A is paged arrives, and sets up conversation.

No doubt, above process can be set up local user B and be connected with the speech channel of roamer A, but the handshaking procedure of calling out at first is the national X that speech channel is connected to user A ownership, and then be routed to the national Y of user A roaming, be user B belonging country, the result has taken two international long-distance speech channels, the situation of this alternative channel, for operator, wasted resource; For the user, pay more cost, typical situation is that user A and B will pay the long distance telephone fee from national X to national Y.

At above problem, a kind of possible solution as shown in Figure 2, local switch LE (Local Exchange) by number analysis judge this international call to as if his network roaming user A, directly arrive the HLR routing inquiry mobile station roaming number MSRN of user A by the GMSC of this country, finish follow-up route according to the physical location of user A.

The local network of realizing this method includes gateway MSC GMSC, VLR Visitor Location Register VLR, moving exchanging center MSC, local switch LE, base station controller BSC etc. at least.

The defective of above scheme is that GMSC and HLR belong to different telecom operators, and well-known user data is the business secret of each operator, and HLR does not allow the GMSC of other operators to visit, thereby this kind scheme lacks internet security, very difficult enforcement.

Summary of the invention

The present invention is directed to the communication network that the problems referred to above provide the communication means of the alternative channel of a kind of roamer of avoiding when called and realized this method.

Realize that communication means of the present invention may further comprise the steps:

(1) local switch LE or moving exchanging center MSC will be routed to critical point mobile switch center GMSC to the calling that roamer A initiates by local user B;

(2) GMSC sends routing inquiry information to the visitor location register RLR of this locality;

(3) the VLR Visitor Location Register VLR of RLR and the current registration of roamer A sets up and gets in touch, RLR is according to the routing inquiry information of GMSC, detect and whether preserve user's data, if preservation is arranged, then RLR is to the VLR of current registration request roaming number MSRN, and returning to GMSC, GMSC routes the call to the MSC of roamer A current location then, then enters step (4);

If do not preserve, RLR returns a MSRN who includes original called number and gives GMSC, and GMSC routes the call to the internet gateway exchange of Home Network then, enters between rete mirabile and calls out;

(4) MSC/VLR sends out beep-page message to the BSC of the lane place of registering corresponding to user A;

(5) set up between the user and converse.

(6) by base station transceiver BTS (Base Transceiver Station), roamer A is paged to be arrived, and sets up conversation.

In above-mentioned steps (1), call initiator local user B both can be the mobile subscriber, it also can be fixed-line subscriber, if local user B is the mobile subscriber, moving exchanging center MSC carries out number analysis, if local user B is a fixed-line subscriber, local switch LE carries out number analysis, and then find the called mobile subscriber of being, be routed to GMSC.

Disclosed method has following technical characterictic and beneficial effect:

(1) local user who makes a call needn't know called subscriber's roaming state, need not to dial special number, as long as call out to initiate network that user and called subscriber roam into and be with ground or same network, the route of calling out promptly is limited in this ground or this network, has avoided the circuitous problem of route;

(2) acquisition of roaming user data does not obtain by direct visit HLR among the RLR, but otherwise, obtains as signalling analysis, only relates to individual user's data, has therefore guaranteed the secure user data of operator;

(3) communication network of realization the inventive method only increases visitor location register RLR on the basis of existing network, preserve the VLR number of other netsurfing user's data and its current registration, and obtain roaming number MSRN from VLR Visitor Location Register VLR, finish the routing inquiry operation, so this communication network is implemented simpler.

The communication network of realizing said method comprises at least: visitor location register RLR, gateway MSC GMSC, VLR Visitor Location Register VLR, moving exchanging center MSC, local switch LE, base station controller BSC.

Wherein, the effect of RLR is similar to HLR, and the main distinction is a position difference in network, and HLR is positioned at roamer's home network HPLMN (Home Public MobileNetwork), and RLR is arranged in the network that the user roams into.When gateway MSC GMSC determined that the called subscriber is roaming mobile subscribers, route information query was directly pointed to RLR, and did not resemble the attaching position register HLR of directed towards user home network HPLMN the prior art.Like this, not only avoid the circuitous of speech channel, can also guarantee safety of user data among the HLR.

In a word, the disclosed method of avoiding alternative channel and realize the network of this method, avoided the circuitous phenomenon of speech channel effectively through called roamer's HPLMN, save user's cost of the phone call greatly, reducing the communication resource takies, make full use of existing network, for the user provides better service.

Description of drawings

Fig. 1 is that the international roaming user of prior art is as called calling procedure schematic diagram;

Fig. 2 is a calling procedure schematic diagram of avoiding the circuitous a kind of possibility scheme of route;

Fig. 3 is a roamer's of the present invention called connection process schematic diagram;

Fig. 4 is the insertion of user data and a delete procedure schematic diagram in the visitor location register in the embodiment of the invention 1;

Fig. 5 is the signaling diagram of the insertion of user data in the visitor location register in the embodiment of the invention 1;

Fig. 6 is the signaling diagram of the deletion of user data in the visitor location register in the embodiment of the invention 1;

Fig. 7 is the process schematic diagram of the insertion and the deletion of the user data in the visitor location register in the embodiment of the invention 2;

Fig. 8 is the signaling diagram of the insertion of the user data in the visitor location register in the embodiment of the invention 2;

Fig. 9 is the signaling diagram of the deletion of the user data in the visitor location register in the embodiment of the invention 2.

Embodiment

In order to be illustrated more clearly in content of the present invention, accompanying drawing 1,2,3,4 and 7 is made the following instructions:

Connected mode	Explanation
Connected mode	Explanation	————	Speech channel (speech path)
--------	Signaling connects (sigalling connectin)	————	Speech channel (speech path)

Roamer's of the present invention called connection process is as shown in Figure 3:

(1) local user B calls out roamer A, and local switch LE or moving exchanging center MSC (not shown) find it is the called mobile subscriber of being by number analysis, calls out and is routed to the nearest GMSC of local networks;

(2) GMSC finds to be the roaming mobile subscribers of netting from him, to send routing inquiry request to the RLR of this locality called;

If do not preserve, RLR returns a MSRN who includes original called number and gives GMSC, and GMSC routes the call to the internet gateway exchange of Home Network then, enters calling procedure between the rete mirabile of prior art;

(5) by base station transceiver BTS (Base Transceiver Station), roamer A is paged to be arrived, and sets up between the user and converses.

In above-mentioned steps (3), if do not preserve user's data among the RLR, RLR returns a special roaming number and gives GMSC, this number has comprised original called number, and (such as special prefix #0) indication GMSC routes calls to internet gateway exchange in some way, calls out route according to internet call setup.

In above-mentioned steps (1), calling subscriber B both can be a fixed-line subscriber, also can be the mobile subscriber, if fixed-line subscriber then carries out number analysis by LE, if the mobile subscriber then carries out number analysis by MSC.

In above process, the attaching position register HLR of VLR in the local network and roamer A home network sets up and gets in touch, and along with the variation of roamer A external environment (for example change of position), the user data that RLR preserves changes to some extent.

As shown in Figure 3, the communication network of realizing above process comprises: visitor location register RLR, gateway MSC GMSC, VLR Visitor Location Register VLR, moving exchanging center MSC, local switch LE and base station controller BSC.

Wherein, RLR is used for catching roamer's data and the VLR number of the current registration of this user, and as gateway MSC GMSC during to the RLR request route information, RLR obtains mobile station roaming number MSRN and passes to GMSC from the VLR of user's registration.

Be further described below in conjunction with the preferred version of accompanying drawing the inventive method.

The present invention discloses two kinds and has been primarily aimed at the feasible embodiment of called subscriber's transnational roaming in conjunction with current widely used global system for mobile communications GSM.Before introducing specific embodiments, for the ease of understanding, Signalling Transfer Point STP (SignalingTransfer Point) makes brief of the introduction earlier.

GSM depends on Signaling System 7(SS-7), and Signalling Transfer Point STP finishes the route and the signaling transfer point of signaling in No.7 nation-wide Network, have important effect.

General Signalling Transfer Point STP processing signaling connects the following signaling of control section SCCP (SignalConnection and Control Part) layer, do not possess the analyzing and processing ability of higher signaling.

The signaling network of country variant is provided with international signaling tandem transit point, and the signaling of all transnational transmission is all passed through international signaling tandem transit point.

Embodiment one:

Present embodiment is a MAP signaling of utilizing tandem signal switching point analysis relevant with mobile station position update, thereby finishes catching of roaming user data, the insertion and the deletion of user data among the control RLR.

The international roaming user signaling is analyzed external roamer's position and is upgraded the dialog procedure relevant with deleting its record all by international signaling tandem transit point, obtains roamer's data and VLR number.This international signaling tandem transit point is limited MAP MAP (Mobile Application Part) the signalling analysis ability that increases on the function basis of the STP of standard.

In order to be different from the STP of standard, we call E-STP to the STP through increased functionality.

As shown in Figure 4, STP is by location registers, renewal or the deletion relevant dialog procedure of analysis with external roamer, the data of catching the roamer, the insertion and the deletion of user data among the control RLR.Wherein, RLR promptly can be an independent entity, also can combine with STP, is used for preserving user's data and VLR number.

Signalling Transfer Point STP catches user's data by the analysis of MAP signaling, and RLR is used for preserving user's data and VLR number, and the operation between STP and the RLR comprises the insertion and the deletion of user data and VLR number.

As shown in Figure 5, when the roamer need carry out the position when upgrading at the network of being roamed, the specific implementation process of its signaling is such:

(1) VLR of the current region of user initiates position updating request (Update Location) to the HLR of home network;

(2) if the position is upgraded to be accepted, HLR sends to VLR and inserts user data requests (Insert subscriber data);

(3) VLR inserts user data, sends the user data insertion to HLR and finishes (Subscriber data insert) in response;

(4) HLR sends the signaling (Subscriber datainsertion ack) of confirming that user data inserts to VLR;

(5) E-STP analyzes the MAP signaling, after roamer's position updating process finishes, sends the request of inserting roaming user data and VLR number to RLR;

(6) RLR checks the data that whether have this roamer, if there is no, then directly inserts this roamer's data and VLR number, if exist, then upgrades original record;

(7) RLR confirms that to E-STP user data inserts.

As shown in Figure 6, after the registration of roamer's canceling position is finished, the request that E-STP sends the deletion user data to RLR, its process is as shown in Figure 6.

(1) VLR sends the signaling (Cancel Location) of canceling position registration to HLR;

(2) HLR confirms the signaling (Cancel Locationack) of canceling position registration to VLR;

(3) E-STP sends the request of canceling position registration (Cancel Location) to by above-mentioned MAP signaling is analyzed to RLR;

(4) RLR checks whether there is this user's data, if having, then deletes this roamer's current data;

(5) RLR confirms canceling position registration (Cancel Location ack) to E-STPF.

Embodiment two

Present embodiment is that its flow process as shown in Figure 7 by the insertion or the deletion of roaming user data and VLR number among the cooperation realization RLR of VLR.

After the registration of roamer completing place, VLR initiates to insert user data and VLR number requested operation to RLR, and as shown in Figure 8, the detailed process of its signaling process is:

(1) VLR of the current region of roamer sends position updating request (Update Location) to the HLR of its home network;

(2) position is upgraded and is accepted, and HLR sends the signaling (Insert subscriber data) of inserting user data to VLR;

(3) VLR sends user data to HLR and inserts signaling (Subscriber datainsert);

(4) HLR sends the signaling (Subscriber datainsertion ack) of confirming user position update to VLR;

(5) VLR sends the request of inserting user data and VLR number to RLR;

(6) RLR inserts user data and VLR number, and confirms that to VLR user data inserts.

Receive external roamer's canceling position registration request as VLR after, VLR initiates the operation of deletion user data to RLR, its signaling process as shown in Figure 9:

(3) VLR sends the request of canceling position registration (Cancel Location) to RLR;

(4) RLR deletes user data, and confirms the information of location registers cancellation (CancelLocation ack) to VLR.

Above embodiment is the situation of user's transnational roaming, and this only is for the convenience on illustrating, technical scheme of the present invention in fact is applicable to that the initiator of all-calls is positioned at local user's all situations of called subscriber's roaming network.And, all be not subjected to the influence of this programme as other all-calls flow processs of called roamer.

In addition, the inventive method has provided two kinds of embodiments at gsm system, yet other selection can be arranged also in the realization, for example this method can be used for other mobile communication system, in the 3-G (Generation Three mobile communication system) as D-AMPS (the digital advanced mobile phone in North America system), CDMA, different systems, the title of its entity or signaling may be different, but principle is consistent, and the network system of implementation method all need add visitor location register RLR.

Claims

1, a kind of communication means of avoiding alternative channel is characterized in that, may further comprise the steps:

(1) local switch (LE) or mobile switching centre (MSC) will be routed to critical point mobile switch center (GMSC) to the calling that roamer A initiates by local user B;

(2) GMSC sends routing inquiry request to the visitor location register (RLR) of this locality;

(3) VLR Visitor Location Register (VLR) of RLR and the current registration of roamer A is set up contact, RLR is according to the routing inquiry request of GMSC, detect and whether preserve user's data, if preservation is arranged, then RLR is to the VLR of current registration request roaming number (MSRN), and returning to GMSC, GMSC routes the call to the MSC of roamer A current location then, then enters step (4);

(5) set up between the user and converse.

2, the method for avoiding alternative channel as claimed in claim 1 is characterized in that, the user B in the described step (1) is positioned at the roaming network of called roaming mobile subscribers;

3, the method for avoiding alternative channel as claimed in claim 1, it is characterized in that, local user B promptly can be a fixed-line subscriber, also can be the mobile subscriber,, then call number be analyzed by LE if user B is a fixed-line subscriber, if user B is the mobile subscriber, then call number is analyzed,, then be routed to GMSC if analysis result draws the called mobile subscriber of being by MSC.

4, the method for avoiding the called alternative channel of roamer as claimed in claim 1, it is characterized in that, in the described step (3), RLR is according to the routing inquiry request of GMSC, detect and whether preserve user's data, if RLR does not preserve user's data, the MSRN that RLR will return to GMSC comprises original called number.

5, the method for avoiding the called alternative channel of roamer as claimed in claim 1 is characterized in that, utilizes signaling tandem transit point to finish catching of roaming user data, the insertion or the deletion of user data among the control RLR.

6, the method for avoiding the called alternative channel of roamer as claimed in claim 3, RLR can be an independent entity, also can combine with Signalling Transfer Point, the operation between Signalling Transfer Point and the RLR comprises the insertion or the deletion of user data.

7, the method for avoiding the called alternative channel of roamer as claimed in claim 4 is characterized in that, described Signalling Transfer Point is to catch user data by analysis MAP (MAP) signaling relevant with mobile station position update or deletion.

8, the method for avoiding the called alternative channel of roamer as claimed in claim 1 directly realizes the insertion or the deletion of roaming user data among the RLR or VLR number by VLR.

9, the method for avoiding the called alternative channel of roamer as claimed in claim 6, when the roamer of other networks after the registration of VLR completing place, VLR initiates to insert the operation of user data to RLR; When VLR receives canceling position when registration of the roamer of other networks, VLR initiates the operation of deletion user data to RLR.

10, a kind ofly be used to realize the communication network of avoiding alternative channel of method according to claim 1, comprise visit gateway MSC (GMSC), VLR Visitor Location Register (VLR), mobile switching centre (MSC), local switch (LE), base station controller (BSC), it is characterized in that, it also comprises visitor location register (RLR), catch the VLR number of roaming user data and the current registration of this user to VLR, and return to GMSC.