CN104066118A - Load sharing method and system for switching of access modes - Google Patents
Load sharing method and system for switching of access modes Download PDFInfo
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Abstract
The invention provides a load sharing method and system for switching of access modes. The system comprises: a load control function unit for obtaining and recording load information of mobile switching center servers (MSC servers), and reporting MSC server recorded information according to the load information when an indication for switching a terminal access mode is received; and a mobility management entity for determining an MSC server capable for providing switching services to a terminal according to the MSC server recorded information. According to the system and method provided by the invention, the load situation of each MSC server in a current MSC server pool is recorded and provided to the mobility management entity, such that the mobility management entity can select a proper light-load MSC server to provide services for a user needing switching according to the load situation of each MSC server in the MSC server pool, and overloading of the MSC server during the switching can be prevented, and effective load sharing for the MSC server pool is ensured.
Description
Technical field
The present invention relates to communication technique field, refer in particular to a kind of method and system of load sharing while switching for access way.
Background technology
At 2 generation (2Generation, abbreviation 2G), 3G(3Generation, abbreviation 3G) in mobile communication network, as global system for mobile communications (Global System for Mobile communications, referred to as GSM), Universal Mobile Telecommunications System (Universal Mobile TelecommunicationsSystem, referred to as UMTS), adopt circuit switching (Circuit Switch, abbreviation CS) mode provides speech business, and has formed good covering.Development along with wireless broad band technology, and network interconnection agreement (Internet Protocol, abbreviation IP) development of technology, whole network is to the direction evolution of all-IP, the core net of communication network is to IP Multimedia System (IP Multimedia Core NetworkSubsystem on the one hand, be called for short IMS) evolution, Radio Access Network develops to packet switching on the other hand, by packet switching (Packet Switch, be called for short PS) network carrying voice and other business, and can directly access IMS, the communication traffic that comprises speech business is provided by IMS.
IMS is by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) a kind of IP-based network architecture proposing, built an opening and service environment flexibly, irrelevant with access, can support multimedia application, can provide abundant multimedia service for user.
In IMS business system, key-course is separated with operation layer, and key-course does not provide concrete business, and the functions such as necessary triggering, route, charging are only provided to operation layer.In key-course, business triggering and control function are CSCF (Call Session Control Function, be called for short CSCF) complete, CSCF be divided into act on behalf of Proxy(and be called for short P-CSCF), inquiry Interrogating(is called for short I-CSCF) and service Serving(abbreviation S-CSCF) three types, that wherein take the main responsibility is Serving, and Interrogating type is optional.Operation layer is to be comprised of a series of application servers (Application Server, be called for short AS), and concrete business service can be provided, and AS can be entity independently, also may reside in S-CSCF.Key-course S-CSCF triggers according to user's CAMEL-Subscription-Information service control, calls the business on AS, realizes business function.AS and S-CSCF can be referred to as service equipment (SE, ServerEquipment).End-to-end equipment in session is called subscriber equipment (User Equipment, be called for short UE), is responsible for mutual with user.In the application of this part, for simple and clear needs, IMS network element is combined into IMS CN(Core Network) describe, some UE have the mode of multiple access network, comprise packet switching (the Packet Switch by 3GPP, be called for short PS territory) access network, by the data field access network of other non-3GPP, even can be by circuit switching (Circuit Switch, abbreviation CS) territory access network etc.
For thering is the UE of plurality of access modes, no matter it can use plurality of access modes or a certain moment can only use a kind of access way simultaneously, if it is carrying out a certain business under a kind of access way, such as talk business, when UE moves to, other are local and while needing to change the access way of using, if UE and network can provide certain mode that the business that UE is carrying out is not interrupted, such ability is referred to as business continuance.
When UE initiates after an audio call based on IMS at 3GPP PS access network (as E-UTRAN), for a certain reason, as be moved, or operator's configuration etc., this calling need to be switched to circuit domain (as UTRAN/GERAN CS), in this scene, UE can not access at PS and CS territory simultaneously, for realizing business continuance, requiring PS network element notice CS network element is that UE is in the reserved resource of target access network in advance, and carry out the switching of IMS layer, after completing, notice UE directly accesses CS network, to shorten user's the voice interruption time, guarantees that user experiences.This technology is called as single channel voice business continuity SRVCC(Single Radio Voice Call Continuity).3GPP also improves and optimizes SRVCC mechanism simultaneously, be referred to as the single channel voice business continuity eSRVCC(enhancedSingle Radio Voice Call Continuity strengthening), its thought is in visited place, IMS territory, to increase a signaling and media anchor point (ATCF/ATGW, Access Transfer Control Function/Access TransferGateway), shorten the switching time of IMS layer.
In above-mentioned handoff procedure, because MSC Server/MGW is as controlling node in the middle of PS territory and CS territory, after user is switched to the MSCS/MGW in CS territory, signaling and media all need to be passed through to MSC Server/MGW(Mobile Switching Centre Server/Media Gateway, mobile services switching centre server/media gateway, also the media gateway that comprises IMS network, the function that is divided into control section MGCF and media processing part MGW, be combined into an entity description) grappling set up new access passage with IMS CN, and communicate by letter with far-end, so fringe region in PS territory and CS territory, be responsible for processing the MSC Server/MGW possibility load of switching higher, can adopt pool technology, dispose a plurality of MSCServer and carry out load sharing.
Fig. 1 is load sharing scene under above-mentioned scene.User, when the source wireless access area of coverage carries out speech business, directly accesses IMS, sets up IMS session with remote subscriber.When user shifts out above-mentioned overlay area, in order to guarantee the continuity of speech business, be switched to CS network, and utilize the Session Anchor function in IMS to keep the continuity of conversing with remote subscriber, can make full use of the advantage that the CS network coverage is good like this, guarantee the continuity of business.In figure, dispose a plurality of MSC Server and carry out load sharing.
As shown in Figure 1:
101, terminal, has the access capability of multiple access capability PS and CS;
102, E-UTRAN, Evolved Universal Terrestrial Radio Access Network, for 4GEPS(Evolved Packet System, the grouping system of evolution) in network, for terminal, provide wireless side system and the network element of PS access at a high speed, and be responsible for triggering the functions such as (e) SRVCC of UE;
103, MME, Mobility Management Entity mobility management unit, that user contracting data is at the storage place of current network, be responsible for NAS layer (the Non-Access Stratum of terminal to network, Non-Access Stratum) tracking and paging management function and the bearer management under signaling management, user's idle pulley, and be responsible for when (e) SRVCC occurs and CS network interaction processing accordingly; (e) the SRVCC user who is responsible for generation in this framework selects a MSC Server in 107 MSC Server Pool;
104, xGW, mainly comprises SGW(Serving Gateway, gateway) and P GW(PDNGW):
SGW gateway, is the gateway that core net arrives wireless system, is responsible for terminal to the user plane bearer of core net, the data buffer storage under terminal idle pulley, the function of network side initiating business request, legal eavesdropping and packet routing and forwarding capability;
P-GW grouped data network gateway, is the grouping domain system (EPS) of evolution and the gateway of this system external network, the functions such as the IP address assignment of responsible terminal, billing function, grouping packet filtering, application of policies.
105, UTRAN/GERAN CS, Universal Terrestrial Radio Access Network, universal land radio access web/GSM EDGE radio access network, GSM EDGE wireless access network circuit domain, is responsible for user from the circuit domain core network access of UTRAN/GERAN;
106, MSCS/MGW, Mobile Switching Centre/Media Gateway, mobile services switching centre and media gateway, be circuit domain core network element, is responsible for processing respectively signaling and the media of user's access.
107, MSC Server Pool, Mobile Switching Centre Server Pool, mobile services switching centre server pools, in (e) SRVCC function, be responsible for and MME mutual signaling and media anchor point that also conduct is switched, set up new access passage with IMS CN.Here comprise a plurality of MSC Server in order to do load sharing;
108, IMS CN, IP Multimedia Subsystem Core Network, IP Multimedia System core net.Comprise P/I/S-CSCF, the network elements such as AS, when eSRVCC, have ATCF/ATGW after the P-CSCF of visited place, be responsible for IMS signaling and media that front and back are switched in grappling.If there is not ATCF/ATGW, or do not carry out media grappling, the media before and after switching are directly routed to far-end UE by xGW, and are routed to far-end UE from MSC Server.Here unrelated to the invention, all network elements are represented with IMS CN;
109, distance terminal, sets up IMS voice conversation with local terminal;
Signaling paths before switching is: terminal, the current P-CSCF of IMS CN(terminal, terminal attaching territory S-CSCF, terminal attaching territory AS), distal end I MS home domain network, distance terminal.If, in IMS CN, there is ATCF after P-CSCF in eSRVCC;
Media path is: if terminal, E-UTRAN, xGW, IMS CN(exist ATGW, otherwise can be without IMS CN), distance terminal;
Signaling paths after switching is: terminal, MSC Server(here and forward direction be CS control signal); After MSC Server, be IMS control signal, path is: MSC Server, IMS CN(terminal attaching territory S-CSCF, terminal attaching territory AS), distal end I MS home domain network, distance terminal.If, in IMS CN, there is the ATCF of visited place before the S-CSCF of terminal attaching territory in eSRVCC;
Media path is: if terminal, MSCS/MGW, MSC Server, IMS CN(exist ATGW, otherwise can be without IMS CN), distance terminal;
Can see, owing to having a plurality of MME and MSCS/MGW in this panel region, signaling not only after switching, and also media also must be anchored on MSC Server, so dispose the object of MSC Server Pool, are in order to reduce the risk of MSC Server overload.
Fig. 2 is the successional realization flow figure of existing voice conversation service, describe UE-1 and set up voice conversation in IMS territory and UE-2, when UE-1 is from PS territory is switched to CS territory, MME has selected a MSC Server in pool to carry out switching, and its specific descriptions are as follows:
Step 201, E-UTRAN are according to many factors, and as user's measurement report, CAMEL-Subscription-Information etc., (e) SRVCC switching is initiated in decision-making, and notifies MME;
Step 202-203, MME select a MSC Server x and initiate handover request to it in pool.
Step 204, MSC Server x be according to the information of switching in message, as Target cell number etc., selects user's target MSC S/MGW, notifies it to switch, the resource of reserved target network side;
Step 205, MSC Server x initiate the switching of IMS layer to IMS CN;
Step 205a, if necessary, IMS CN initiates far-end to distance terminal and upgrades;
Step 206, MSC Server x reply handoff response to MME;
Step 207, MME reply handoff response to E-UTRAN;
Step 208, E-UTRAN notification terminal initiate to switch to objective network;
The CS network of step 209, terminal access target;
So far whole switching completes;
Yet there are the following problems for the MSC Server x selection mode of above-mentioned existing session business continuance implementation method:
Prior art MME generally adopts the modes such as hash algorithm to select MSC Server x for user, but due to owing to having a plurality of MME and MSCS/MGW in this panel region, signaling not only after switching, and media also must be anchored on MSC Server, even so dispose MSC Server Pool, but a plurality of MME likely select same MSC Server x within certain a period of time, so still can cause the MSC Server load in pool uneven, even transship; And MSC Server is not only Signaling Processing Unit, and necessarily need grappling media here, the voice conversation short time may not can discharge, thus the situation that this load inequality is even transshipped occur may be higher than the overload possibility in general MSC pool; Once and appearance is transshipped, a plurality of MME do not have its load information before mutual with MSC Server, still may select this MSC Server, if fault tolerant mechanism imperfection may cause service to be refused; Or MME need to reselect MSC Server, cause switching delay, may cause handoff failure.
Summary of the invention
According to more than, the object of technical solution of the present invention is to provide a kind of method and system of load sharing while switching for access way, for mobile services switching centre server pools MSC Server pool is carried out to effective load sharing, avoid MSC Server overload when access way is switched.
The invention provides a kind of system of load sharing while switching for access way, described system comprises:
Function LCF unit is controlled in load, for obtaining the also loading condition information of record move service switching center server MSCserver, when receiving the indication that terminal access mode switches, according to described loading condition information, report MSC server recorded information;
Mobility management unit MME, for according to described MSC server recorded information, determines the MSC server of handed over service can be provided for terminal.
Preferably, system described above, described MSC server recorded information comprises name information and the corresponding described loading condition information of MSC server of all MSC server.
Preferably, system described above, described load control function LCF unit also for: when receiving the indication that terminal access mode switches, according to described loading condition information, judgement can provide for terminal the MSC server of service.
Preferably, system described above, described MSC server recorded information comprises allly can provide for terminal name information and the corresponding described loading condition information of MSC server of the MSC server of service.
Preferably, system described above, described load control function LCF unit also for: according to described loading condition information, select at least one MSC server to provide service for terminal; Wherein said MSCserver recorded information comprises name information and the corresponding described loading condition information of MSC server of selected MSC server.
Preferably, system described above, described mobility management unit MME also for: indicate described load to control function LCF unit and send loading condition inquiry request to MSC server, make mobile services switching centre server MSC server according to described inquiry request, report current loading condition.
Preferably, system described above, described loading condition information be report the mobile services switching centre server MSC server interval scheduled time for the information of present load state is described.
Preferably, system described above, the present load that described loading condition information is MSC server surpasses the first preset value, report lower than the second preset value and/or between the 3rd preset value and the 4th preset value time for the information of present load state is described.
Preferably, system described above, described mobility management unit MME also for: to MSCserver transmitting terminal access way handover request, and instruct MS C server reports current load condition.
Preferably, system described above, described loading condition information be MSC server according to described handover request, return last time switching response message or handover success when notice last time report for the information of present load state is described.
The present invention also provides a kind of method of load sharing while switching for access way, and described method comprises:
Obtain the also loading condition information of record move service switching center server MSC server; When receiving the indication that terminal access mode switches, according to described loading condition information and described MSCserver recorded information, determine the MSC server of handed over service can be provided for terminal.
Preferably, method described above, described MSC server recorded information comprises name information and the corresponding described loading condition information of MSC server of all MSC server.
Preferably, method described above, also comprises:
When receiving the indication that terminal access mode switches, according to described loading condition information, judgement can provide for terminal the MSC server of service.
Preferably, method described above, described MSC server recorded information comprises allly can provide for terminal name information and the corresponding described loading condition information of MSC server of the MSC server of service.
Preferably, method described above, when receiving the indication that terminal access mode switches, described method also comprises: according to described loading condition information, select at least one MSC server to provide service for terminal; Wherein said MSC server recorded information comprises name information and the corresponding described loading condition information of MSC server of selected MSC server.
Preferably, method described above, also comprises: to MSC server, send loading condition inquiry request, make mobile services switching centre server MSC server according to described inquiry request, report current loading condition.
Preferably, method described above, described loading condition information be report the mobile services switching centre server MSC server interval scheduled time for the information of present load state is described.
Preferably, method described above, the present load that described loading condition information is MSC server surpasses the first preset value, report lower than the second preset value and/or between the 3rd preset value and the 4th preset value time for the information of present load state is described.
Preferably, method described above, before the step of the described loading condition information of obtaining mobile services switching centre server MSCserver, also comprises:
To MSC server transmitting terminal access way handover request, and instruct MS C server reports current load condition.
Preferably, method described above, described loading condition information be MSC server according to described handover request, return last time switching response message or handover success notice time last time report for the information of present load state is described.
At least one in specific embodiment of the invention technique scheme has following beneficial effect:
By recording the loading condition of each MSC Server in current MSC Server pool, and offer mobility management unit MME, make mobility management unit MME to select suitable underloaded MSC Server to provide service for the user who switches according to the situation of each MSC Server load in MSC Server pool, thereby can avoid the overload of MSC Server when switching, and guarantee the effective load sharing of MSC Server pool, realize correct service logic, guarantee that user experiences.
Accompanying drawing explanation
Fig. 1 represents the system construction drawing of prior art load sharing;
Fig. 2 represents the successional realization flow figure of prior art voice conversation service;
Fig. 3 represents the application architecture figure of system described in first embodiment of the invention;
Fig. 4 is system described in explanation employing first embodiment of the invention, the schematic flow sheet of load sharing when access way is switched;
Fig. 5 represents the application architecture figure of system described in second embodiment of the invention;
Fig. 6 is system described in explanation employing second embodiment of the invention, the schematic flow sheet of load sharing when access way is switched.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
The system of load sharing while switching for access way described in the specific embodiment of the invention, comprising:
Function LCF unit is controlled in load, for obtaining the also loading condition information of record move service switching center server MSCserver, when receiving the indication that terminal access mode switches, according to described loading condition information, report MSC server recorded information;
Mobility management unit MME, for according to described MSC server recorded information, determines the MSC server of handed over service can be provided for terminal.
System described in the specific embodiment of the invention, by being set, load controls function LCF unit, obtain and record the loading condition of each MSC Server in current MSC Server pool, and offer where necessary mobility management unit MME, make MME to select suitable underloaded MSC Server to provide service for the terminal switching according to the situation of each MSCServer load in MSC Server pool, assurance is carried out effective load sharing to each MSC Server in MSC Server pool, realize correct service logic, guarantee that user experiences.
Fig. 3 represents the Organization Chart of system applies described in first embodiment of the invention.Consult shown in Fig. 3, for the group network system of load sharing, comprise:
Terminal 301, the general continental rise wireless access network E-UTRAN302 of evolution, mobility management unit MME303, gateway XGW304 (mainly comprising gateway SGW and grouped data network gateway P-GW), universal land radio access web UTRAN/GSM edge wireless access network circuit domain GERANCS305, mobile services switching centre MSCS/ media gateway MGW 306, mobile services switching centre server pools MSC Server Pool307, IP Multimedia System core net IMS CN308, function LCF unit 310 is controlled in distance terminal 309 and load, by each part mentioned above, realize voice conversation service continuity, in IMS territory and UE-2, set up voice conversation, when UE-1 is from PS territory is switched to CS territory, by MME303, select a MSC server in MSC Server Pool307 to carry out switching, same as the prior art, comprise following step:
Step 110, E-UTRAN302 are according to many factors, and as user's measurement report, CAMEL-Subscription-Information etc., (e) SRVCC switching is initiated in decision-making, and notifies MME303;
Step 120, in MSC Server pool307, select a MSC Server x and initiate handover request to it.
Step 130, MSC Server x be according to the information of switching in message, as Target cell number etc., selects user's target MSC S/MGW306, notifies it to switch, the resource of reserved target network side;
Step 140, MSC Server x initiate the switching of IMS layer to IMS CN308;
Step 150, if necessary, IMS CN308 initiates far-end to distance terminal and upgrades;
Step 160, MSC Server x reply handoff response to MME303;
Step 170, MME303 reply handoff response to E-UTRAN302;
Step 180, E-UTRAN302 notification terminal initiate to switch to objective network;
The CS network of step 190, terminal 301 access targets, completes handoff procedure.
System described in the employing specific embodiment of the invention, compared to the above-mentioned handoff procedure of prior art, in above-mentioned step 120, increase load and control function LCF unit 310, for obtain the loading condition information of each mobile services switching centre server MSC server from MSC Server pool307, when receiving the indication that terminal access mode switches, according to described loading condition information, report MSC server recorded information, make mobility management unit MME303, can be according to described MSC server recorded information, determine the MSC Server of handed over service can be provided for terminal, thereby the handover request that mobility management unit MME303 can trigger E-UTRAN302 is routed to suitable MSC Server.
Therefore, in the specific embodiment of the invention, mobility management unit MME303 is except the function of prior art, also and between load control function LCF unit 310 be provided with query interface, mobility management unit MME303 can be by the suitable MSC Server information of this interface inquiry MSC Server pool307, or the load information of inquiry MSC Server, in order to follow-up hand-off process.
Each MSC Server in MSC Server pool307, except after the function of prior art, also and between load control function LCF unit 310 is provided with interface.By this interface, MSC Server controls function LCF unit 310 to load and reports present load situation.
In addition, load is controlled between function LCF unit 310 and mobility management unit MME303 and MSCServer interface, for being responsible for recording and/or inquiring about the loading condition of all MSC Server, and according to the query messages of mobility management unit MME303, report the loading condition of MSC Server, or directly for mobility management unit MME303 chooses suitable MSC Server, report mobility management unit MME303 as follow-up switching.
Fig. 4 is explanation employing specific embodiment of the invention said system, the schematic flow sheet of load sharing mode when access way is switched.Consult shown in Fig. 4, wherein a kind of implementation comprises:
Step 401a-401n, the MSC Server1-n in MSC Server pool307 controls function LCF unit 310 to load respectively and reports current loading condition information;
Wherein, loading condition information can be: the present load situation of MSC Server, as calls, performance percentage etc.; Or be according to the present load rank of the definite MSC Server of Provisioning Policy, as set when present load surpasses the first preset value, be that high capacity, present load are that low load or present load are defined as having a load level between the 3rd preset value and the 4th preset value time during lower than the second preset value, in the time of between different default values, there is different loads rank.
In addition, MSC Server pool307 reports to be the opportunity of current loading condition information to load control function LCF unit 310:
Interval predetermined period of time reports;
When present load state reaches pre-set level, or load condition rank just reports while changing.
Step 402a, E-UTRAN302 triggers to switch and send and handovers messages to mobility management unit MME303;
Step 402b, mobility management unit MME303 controls function LCF unit 310 to load and initiates inquiry;
Step 402c, load is controlled function LCF unit 310 and is returned to MSC server recorded information to mobility management unit MME303;
Wherein MSC server recorded information can comprise name information and the corresponding described loading condition information of MSCserver of all MSC server, also be that load control function LCF unit 310 returns to the loading condition information of obtained all MSC server to report mobility management unit MME303, by mobility management unit MME303 judgement, also therefrom select suitable MSC server to carry out handover operation;
Further, described load is controlled function LCF unit 310 and can be worked as while receiving the indication that terminal access mode switches, according to described loading condition information, judgement can provide for terminal the MSCserver of service, described MSC server recorded information comprises in such cases allly can provide for terminal name information and the corresponding described loading condition information of MSC server of the MSC server of service, but specifically determines it is by which MSC server handed over service is provided or is determined by mobility management unit MME303 for terminal;
Further, described load is controlled function LCF unit 310 and can also be directly from all, can the MSC server of service, be selected at least one MSC server to provide service for terminal for terminal provides, in situation, described MSC server recorded information comprises and name information and the corresponding described loading condition information of MSCserver of selected MSC server can directly determined MSC server be reported to mobility management unit MME303 for carrying out follow-up switching so herein.
Step 402d, mobility management unit MME303 is according to Query Result, and the suitable MSC server recording to MSC server recorded information carries out handover operation, or from MSC server recorded information, chooses suitable MSC server and carry out handover operation.
In the implementation of sharing at above-mentioned access switchable load, no matter whether receive the switching indication of E-UTRAN302, function LCF unit 310 is controlled in load can regularly or aperiodically obtain loading condition information from MSC server, except aforesaid way, the present invention also provides the mode of another kind of load sharing, only have when receiving the switching indication of E-UTRAN302, according to load, control the inquiry request that initiate to MSC server function LCF unit 310, MSC serve reports current loading condition information, mode two as shown in Figure 4, specifically comprises:
Step 402a, E-UTRAN302 triggers to switch and send and handovers messages to mobility management unit MME303;
Step 402b, mobility management unit MME303 controls function LCF unit 310 to load and initiates inquiry;
Step 403a-n, load is controlled function LCF unit 310 and is inquired about current loading condition information to MSC Server;
Step 402c, load is controlled function LCF unit 310 and is returned to MSC Server recorded information to mobility management unit MME303;
Step 402d, mobility management unit MME303 is according to Query Result, and the suitable MSC server recording to MSC server recorded information carries out handover operation, or from MSC server recorded information, chooses suitable MSC server and carry out handover operation.
Wherein in implementation two, load is controlled the content of the loading condition information that function LCF unit 310 obtains and the content of the MSC Server recorded information returned to mobility management unit MME303, and identical with implementation one do not repeat them here.
The specific embodiment of the invention also provides the system of the second embodiment, the application architecture figure of system described in second embodiment of the invention as shown in Figure 5, in a second embodiment, load is controlled function LCF unit and is arranged in mobility management unit MME503, and other unit are identical with the first embodiment.
Adopt system described in the second embodiment, mobility management unit MME503 has increased load and has controlled the function that function LCF unit has, and it is as follows to strengthen function:
In MSC server transmitting terminal access way handover request, instruct MS C server reports current load condition; And receive MSC server according to described handover request, return last time switching response message or reported during handover success notice last time for the loading condition information of present load state is described.
Load is controlled function LCF unit for recording and upgrading above-mentioned loading condition information; And receive after handover request in next time, load control function LCF unit or mobility management unit MME503, according to preserved loading condition information, select suitable MSC server, for carrying out follow-up handover operation.
MSC Server pool307 is except the above-mentioned functions described in the first embodiment, and each MSCserver, return to switching response message or last time during handover success notification message last time to mobility management unit MME503, reports current loading condition information.Specifically can indicate according to whether carrying load requests in the message such as handover request of mobility management unit MME503, or according to the configuration of self, whether decision-making reports its present load situation.
In a second embodiment, the content that MSC Server returns to mobility management unit MME503 the loading condition information reporting is identical with the first embodiment, does not repeat them here.
Fig. 6 is for adopting system loading described in second embodiment of the invention to share workflow schematic diagram under the group-network construction of mode.Consult shown in Fig. 6, comprising:
Step 601, E-UTRAN302 is according to many factors, and as user's measurement report, CAMEL-Subscription-Information etc., (e) SRVCC switching is initiated in decision-making, and notifies mobility management unit MME503;
Step 602-203, mobility management unit MME503 controls the loading condition of each MSC Server in the MSC Server Pool307 storing function LCF unit according to load, choose a MSCServer x and initiate handover request to it.
Mobility management unit MME503 can add indication in this request, requires MSC Server x to report its load information;
Step 604, MSC Server x is according to the information of switching in message, as Target cell number etc., selects user's target MSC S/MGW306, notifies it to switch, the resource of reserved target network side;
Step 605, MSC Server x initiates the switching of IMS layer to IMS CN308;
Step 605a, if necessary, IMS CN308 initiates far-end to distance terminal 309 and upgrades;
Step 606, MSC Server x replys handoff response to mobility management unit MME503, and carries current loading condition information;
MSC Server can indicate according to whether carrying load requests in the message such as handover request of mobility management unit MME503, or according to the configuration of himself, whether decision-making reports its loading condition;
Step 607, load is controlled function LCF unit record and/or is upgraded the loading condition information about MSCServer x of wherein preserving, and to E-UTRAN302, replys handoff response by mobility management unit MME503;
Step 608, E-UTRAN302 notification terminal 301 initiates to switch to objective network;
Step 609, the CS network of terminal 301 access targets; So far whole switching completes.
If follow-up, switch again, also comprise:
Step 610, E-UTRAN302 is according to many factors, and as user's measurement report, CAMEL-Subscription-Information etc., (e) SRVCC switching is initiated in decision-making, and notifies mobility management unit MME503;
Step 611, mobility management unit MME503 controls the loading condition of each MSC Server in the MSC Server Pool307 storing function LCF unit according to load, choose a MSC Servery and initiate handover request to it.
The specific embodiment of the invention provides a kind of method of load sharing while switching for access way on the other hand, and described method comprises:
Obtain the also loading condition information of record move service switching center server MSC server; When receiving the indication that terminal access mode switches, according to described loading condition information and described MSCserver recorded information, determine the MSC server of handed over service can be provided for terminal.
Can adopt the system architecture diagram of the method for the invention can consult shown in Fig. 3 and Fig. 5.Wherein the function of the method for the invention can realize by a modular unit, also can realize by two modular units, also be that load is controlled function LCF unit and mobility management unit MME and can be combined and be arranged in a module, also can distinguish independent setting.Particularly:
Wherein, loading condition information can be: the present load situation of MSC Server, as calls, performance percentage etc.; Or be according to the present load rank of the definite MSC Server of Provisioning Policy, as set when present load surpasses the first preset value, be that high capacity, present load are that low load or present load are defined as having a load level between the 3rd preset value and the 4th preset value time during lower than the second preset value, in the time of between different default values, there is different loads rank.
In addition, MSC Server reports to be the opportunity of current loading condition information:
Interval predetermined period of time reports;
When present load state reaches pre-set level, or load condition rank just reports while changing.
In addition, MSC server recorded information can comprise: the described loading condition information that the name information of all MSC server and MSCserver are corresponding.
Further, also can work as while receiving the indication that terminal access mode switches, according to described loading condition information, judgement can provide for terminal the MSC server of service, described MSCserver recorded information comprises in such cases allly can provide for terminal name information and the corresponding described loading condition information of MSC server of the MSC server of service, but specifically determines it is by which MSC server handed over service is provided or is determined by mobility management unit MME for terminal;
Further, can also be directly from all, can the MSC server of service, select at least one MSC server to provide service for terminal for terminal provides, in situation, described MSC server recorded information comprises and name information and the corresponding described loading condition information of MSC server of selected MSC server can directly determined MSC server be reported to mobility management unit MME for carrying out follow-up switching so herein.
Further, described method can also comprise: to MSC server, send loading condition inquiry request, make mobile services switching centre server MSC server according to described inquiry request, report current loading condition.
In addition,, when method described in the specific embodiment of the invention adopts system shown in Figure 5, described method also comprises:
To MSC server transmitting terminal access way handover request, and instruct MS C server reports current load condition.
In this kind of situation, described loading condition information be MSC server according to described handover request, return last time switching response message or handover success notice time last time report for the information of present load state is described.
Method and system described in the specific embodiment of the invention, by recording the loading condition of each MSC Server in current MSC Server pool, and offer mobility management unit MME, make mobility management unit MME to select suitable underloaded MSC Server to provide service for the user who switches according to the situation of each MSC Server load in MSC Server pool, can avoid MSC Server overload when switching, and guarantee the effective load sharing of MSC Server pool, realize correct service logic, guarantee that user experiences.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (20)
1. while switching for access way, a system for load sharing, is characterized in that, described system comprises:
Function LCF unit is controlled in load, for obtaining the also loading condition information of record move service switching center server MSCserver, when receiving the indication that terminal access mode switches, according to described loading condition information, report MSC server recorded information;
Mobility management unit MME, for according to described MSC server recorded information, determines the MSC server of handed over service can be provided for terminal.
2. the system as claimed in claim 1, is characterized in that, described MSC server recorded information comprises name information and the corresponding described loading condition information of MSC server of all MSC server.
3. the system as claimed in claim 1, it is characterized in that, described load control function LCF unit also for: when receiving the indication that terminal access mode switches, according to described loading condition information, judgement can provide for terminal the MSC server of service.
4. system as claimed in claim 3, is characterized in that, described MSC server recorded information comprises allly can provide for terminal name information and the corresponding described loading condition information of MSC server of the MSC server of service.
5. system as claimed in claim 3, is characterized in that, described load control function LCF unit also for: according to described loading condition information, select at least one MSC server to provide service for terminal; Wherein said MSC server recorded information comprises name information and the corresponding described loading condition information of MSCserver of selected MSC server.
6. the system as claimed in claim 1, it is characterized in that, described mobility management unit MME also for: indicate described load to control function LCF unit and send loading condition inquiry request to MSC server, make mobile services switching centre server MSC server according to described inquiry request, report current loading condition.
7. the system as claimed in claim 1, is characterized in that, described loading condition information be report the mobile services switching centre server MSC server interval scheduled time for the information of present load state is described.
8. the system as claimed in claim 1, it is characterized in that, the present load that described loading condition information is MSCserver surpasses the first preset value, report lower than the second preset value and/or between the 3rd preset value and the 4th preset value time for the information of present load state is described.
9. the system as claimed in claim 1, is characterized in that, described mobility management unit MME also for: to MSC server transmitting terminal access way handover request, and instruct MS C server reports current load condition.
10. system as claimed in claim 9, is characterized in that, described loading condition information be MSCserver according to described handover request, return last time switching response message or handover success when notice last time report for the information of present load state is described.
The method of 11. 1 kinds of load sharings while switching for access way, is characterized in that, described method comprises:
Obtain the also loading condition information of record move service switching center server MSC server; When receiving the indication that terminal access mode switches, according to described loading condition information and described MSCserver recorded information, determine the MSC server of handed over service can be provided for terminal.
12. methods as claimed in claim 11, is characterized in that, described MSC server recorded information comprises name information and the corresponding described loading condition information of MSC server of all MSC server.
13. methods as claimed in claim 11, is characterized in that, described method also comprises:
When receiving the indication that terminal access mode switches, according to described loading condition information, judgement can provide for terminal the MSC server of service.
14. methods as claimed in claim 13, is characterized in that, described MSC server recorded information comprises allly can provide for terminal name information and the corresponding described loading condition information of MSC server of the MSC server of service.
15. methods as claimed in claim 13, is characterized in that, when receiving the indication that terminal access mode switches, described method also comprises: according to described loading condition information, select at least one MSC server to provide service for terminal; Wherein said MSC server recorded information comprises name information and the corresponding described loading condition information of MSC server of selected MSC server.
16. methods as claimed in claim 11, is characterized in that, described method also comprises: to MSCserver, send loading condition inquiry request, make mobile services switching centre server MSC server according to described inquiry request, report current loading condition.
17. methods as claimed in claim 11, is characterized in that, described loading condition information be report the mobile services switching centre server MSC server interval scheduled time for the information of present load state is described.
18. methods as claimed in claim 11, it is characterized in that, the present load that described loading condition information is MSCserver surpasses the first preset value, report lower than the second preset value and/or between the 3rd preset value and the 4th preset value time for the information of present load state is described.
19. methods as claimed in claim 11, is characterized in that, before the step of the described loading condition information of obtaining mobile services switching centre server MSC server, also comprise:
To MSC server transmitting terminal access way handover request, and instruct MS C server reports current load condition.
20. methods as claimed in claim 19, it is characterized in that, described loading condition information be MSCserver according to described handover request, return last time switching response message or handover success notice time last time report for the information of present load state is described.
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