CN101114927A - System and method for implementing load balancing - Google Patents
System and method for implementing load balancing Download PDFInfo
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- CN101114927A CN101114927A CNA200610099478XA CN200610099478A CN101114927A CN 101114927 A CN101114927 A CN 101114927A CN A200610099478X A CNA200610099478X A CN A200610099478XA CN 200610099478 A CN200610099478 A CN 200610099478A CN 101114927 A CN101114927 A CN 101114927A
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Abstract
The invention discloses a method that realizes balanced load and is applied to a system which at least comprises an evolution radio access network (E-RAN) and more than one mobility management entities (MME). The method is that when the E-RAN receives initial information from a user equipment, the E-RAN selects a service MME for the user equipment and sends a connection request to the service MME; if the service MME needs to transfer the user equipment, a target MME is selected for the user equipment and the user equipment is attached to the target MME, meanwhile, the invention also discloses a system that realizes balanced load. The invention utilizes a plurality of MMEs to undertake collaboratively signaling loads of a network, since each MME is an independent physical entity, when the MME is overloaded, the UE can be transferred to other MME quickly.
Description
Technical field
The present invention relates to the mobile communication technology field, be meant a kind of system and method for realizing load balancing especially.
Background technology
Universal mobile telecommunications system (UMTS) is the technical standard of a kind of 3-G (Generation Three mobile communication system) of organizing to set up of third generation partner program (3GPP).At present, 3GPP is organized in the research UMTS network next generation network of evolution backward, this network is called " evolvement network " herein, and formulates the technical standard of evolvement network.Evolvement network has a lot of new characteristics, and for example: the packet-type business only is provided, and real time business such as voice, visual telephone provide in the mode of grouping; Realize all internet protocol (IP) network, each node device interconnects by IP network in the network, and after each subscriber equipment was finished network attachment, network was its distributing IP address; Better network topology structure can be set up many-to-many relationship to improve the reliability of network between the equipment, and a plurality of equipment are born offered load jointly and realized load balancing.
Fig. 1 has described the structure of evolvement network.Referring to shown in Figure 1, evolvement network is made up of three parts, comprise the evolution wireless access network (Evolved Radio Access Network, E-RAN), evolution block core net (Evolved Packet Core, EPC) and subscriber equipment (User Equipment, UE).E-RAN is meant the evolution wireless access network of being made up of some evolution base stations (eNodeB).Four logical functional entities are arranged in the evolution block core net, be Mobility Management Entity (Mobility Management Entity, MME), user entity (User Plane Entity, UPE), 3GPP anchor point (3GPP Anchor) and SAE anchor point (SAE Anchor).MME realizes the chain of command function of mobile management and S1 interface, UPE realizes encryption, head compression, the Frame processing capacity of user data, 3GPP Anchor is as the user's face anchor point when mobile between 2G/3G and the evolvement network, and SAE Anchor is as the user's face anchor point when mobile between 3GPP system and the non-3 GPP system.How four logical functional entity MME, UPE, 3GPPAnchor and SAEAnchor are deployed in different physical equipments, and the 3GPP tissue is not determined at present.What Fig. 1 described is that MME and UPE are deployed in distinct device, and 3GPP Anchor and SAE Anchor are deployed in the situation of same equipment, it between E-RAN and the MME/UPE S1 interface, wherein the interface of E-RAN and MME is chain of command interface S1-c, and the interface between E-RAN and the UPE is interface in the user plane S1-u.
In the actual construction of evolvement network, will dispose more than one MME and user-end provider edge, and bear the load of network by these MME and UPE jointly.In evolvement network, how to realize that some MME and user-end provider edge bear offered load jointly, be the problem that needs research.
In the TS23.236 technical standard that 3GPP formulates, provide a kind of method at CN node load equilibrium in the UMTS network, core net (CN) comprises mobile switching centre (MSC) and Serving GPRS Support Node (SGSN), is that example illustrates this method below with SGSN.
RNC and SGSN interconnect by IP network, form many-to-many relationship.Several SGSN form a SGSN pond, each SGSN is assigned 1 or plurality of network resource identification (Network ResourceIdentity, NRI), the scope that covered of the access network controller (RNC) of all and these SGSN interconnection is called pool area (Pool Area).When UE carries out network attachment for the first time in pool area, select a SGSN to provide service for UE in the SGSN pond by RNC, UE is attached to this SGSN, and this SGSN is the service SGSN of this UE.After UE successfully adhered to, service SGSN was that UE distributes temporary mark P-TMSI, and points out to serve the NRI of SGSN in P-TMSI, and service SGSN also provide a cycle time (Period Time) that is used for the control cycle Routing Area Update for UE.In pool area, when UE carries out network, Routing Area Update at every turn or initiates service call, point out to serve the NRI of SGSN in sending to the message of RNC, RNC selects the service SGSN of UE according to NRI, therefore UE provides service by same SGSN for UE in pool area.
When SGSN overload or when carrying out attended operation, for example SGSN equipment is restarted, and shifts part UE or all among UE other SGSN in the SGSN pond by the SGSN decision.The method that shifts is as follows:
When UE carried out network attachment or Routing Area Update, service SGSN judged whether to need to shift UE, if need to shift, service SGSN is that UE distributes a P-TMSI, carries a special NullNRI among this P-TMSI.Simultaneously, service SGSN provides the very short cycle time (Period Time) of time, about 4 seconds for UE.Service SGSN accepts the request of adhering to of UE, and points out to carry in issuing the message of UE P-TMSI and the very short cycle time of time of NullNRI.
UE is according to new start-up period routing update cycle time timer, and when timer expiry, UE uses new P-TMSI to initiate Routing Area Update.RNC finds that according to the Null NRI of the SGSN that self disposes the NRI that UE provides is special Null NRI, and RNC selects service SGSN for UE again and the Routing Area Update request message is routed among the new SGSN.UE carries out normal Routing Area Update process, and is attached among the new SGSN.So far, UE transfers to another SGSN from a SGSN, and will provide service by new SGSN for UE always, and this SGSN is new service SGSN.New service SGSN is that UE redistributes P-TMSI and specifies normal cycle time, points out the normal NRI of SGSN among the P-TMSI.
Above-mentioned shortcoming at the method for CN node load equilibrium in the UMTS network is:
1) it is long to shift time of UE, shifts UE from the SGSN decision and transfers to new SGSN to UE, needs the one-period time at least, for example 4 seconds;
2) the transfer process interacting message is frequent, and UE needs to set up with SGSN, twice signaling of release is connected, and causes network overhead excessive, if the UE that shifts in the short time is many, can cause apparatus of load to increase the weight of.
And, because SGSN not only realizes chain of command but also realize user plane functions, and in evolvement network, MME realizes the chain of command function, UPE realizes user plane functions, when MME and UPE are arranged on distinct device, can set up the control and the Be Controlled relation of multi-to-multi between MME equipment and the user-end provider edge, therefore said method can not be applied in MME and the evolvement network that UPE separates, must redesign the method for load balancing.
Summary of the invention
In view of this, main purpose of the present invention provides a kind of system and method for realizing load balancing, to solve the unbalanced problem of load in the evolvement network.
A kind of method that realizes load balancing provided by the invention is applied to comprise at least that this method comprises in the system of evolution wireless access network E-RAN, an above Mobility Management Entity MME:
When A.E-RAN received from the initial message of subscriber equipment, E-RAN selected serving MME for this subscriber equipment, sent connection request to serving MME;
If B. serving MME needs transferring user equipment, be this subscriber equipment select target MME, this subscriber equipment is attached to target MME.
This subscriber equipment is attached to target MME step and can comprises among the step B:
B11, serving MME send to E-RAN and connect the refusal response, wherein contain target MME sign;
B12, E-RAN send connection request to target MME after receiving and connecting the refusal response;
After B13, target MME receive connection request, send connection response message to E-RAN.
After step B13, this method may further include:
The address that B131, target MME determine the former MME that adheres to of subscriber equipment according to the temporary mark and the tracking area identification of subscriber equipment in the initial message, and migrate out the communication context of this subscriber equipment from the former MME that adheres to;
B132, target MME obtain the user profile of this subscriber equipment from attaching position register, and this subscriber equipment is carried out authentication, if authentication is passed through, then are this user equipment allocation temporary mark; Otherwise, process ends.
The step that this subscriber equipment is attached to target MME among the step B can comprise:
B21, serving MME send connection request message to target MME, wherein contain in the connection request message to shift indication;
B22, target MME accept connection request, and directly reply connection response message to E-RAN, and target MME sets up signaling with E-RAN and is connected.
Among the step B21 serving MME to target MME send connection request message mode can for:
Serving MME is directly issued target MME with the packet of the connection request message received by transport layer, or serving MME is encapsulated in connection request message in the signaling message of MME interface and sends to target MME.
Initial message can carry Attach Request message or tracing section updating request message in the steps A.
In the steps A E-RAN select serving MME method can for: select serving MME according to static configuration data, perhaps select MME according to the load information of MME.
Serving MME can determine whether needs shift MME to this subscriber equipment according to following one or more factors among the step B:
The MME load surpasses certain upper limit, MME and needs that system restarts, MME receives orders indication need migrate out certain customers' equipment.
Described system also comprises an above user entity UPE, and after step B, this method may further include:
C. the MME that adheres to of this subscriber equipment selects UPE for this subscriber equipment, and subscriber equipment is attached among the selected UPE.
Step C can comprise:
The MME that C11, this subscriber equipment adhere to selects UPE for this subscriber equipment, and adheres to request to this UPE transmission UPE;
C12, UPE are that subscriber equipment is created communication context, distributed temporary mark and IP address;
C13, set up the user's face link between UPE and the subscriber equipment, UPE and subscriber equipment are consulted the algorithm and the parameter of encrypting, and send to adhere to MME then and accept message;
C14, MME receive adhere to accept message after, notifying user equipment is adhered to and is finished.
MME selects according to one or more factors in business information, routing optimality and the hometown-agent-address of the load of UPE and state, subscriber equipment subscription data among the step C11.
Described system also comprises an above UPE, and after step B, this method may further include:
Among the service UPE that the MME that this subscriber equipment adheres to adheres to this subscriber equipment attached to the last time.
A kind of system of load balancing that realizes provided by the invention comprises: the E-RAN that is connected with subscriber equipment, an above MME, wherein,
E-RAN is used to receive the initial message from subscriber equipment, selects serving MME for subscriber equipment from a described above MME, and sends connection request to serving MME;
Serving MME after being used to receive connection request, need to determine whether transferring user equipment, shifts if desired, and from a described above MME, be subscriber equipment select target MME;
Target MME is used to described subscriber equipment that mobile management and chain of command function are provided.
This system also comprises an above UPE, and then described target MME can be further used for need determining whether the service UPE of transferring user equipment, if, select target UPE from a described above UPE then, otherwise the service UPE that this subscriber equipment last time is adhered to is as target UPE;
Target UPE can be used to described subscriber equipment that user's face processing capacity is provided.
By such scheme as can be known, method of the present invention utilizes some MME to bear the signaling load of network jointly, because some MME are physical entities independently, therefore when MME transshipped, MME judged whether to need to shift UE, if desired, then MME can select the lower MME of load as target MME for subscriber equipment, and will directly or by E-RAN send to target MME from the E-RAN connection request, UE transfers to MME, connects and need not to set up, discharge twice signaling.Therefore, the present invention shifts that the method for UE is simple, speed is fast.
Description of drawings
Fig. 1 is the structural representation of evolvement network;
Fig. 2 is for realizing the networking structure schematic diagram of system of the present invention;
Fig. 3 is for realizing the schematic flow sheet of the inventive method;
Fig. 4 is the schematic flow sheet of the serving MME transfer scheme of E-RAN heavy-route among the present invention;
Fig. 5 is the schematic flow sheet of the serving MME transfer scheme of MME heavy-route among the present invention.
Embodiment
Referring to shown in Figure 2, realize that system of the present invention comprises E-RAN, MME resource pool, UPE resource pool.Wherein, the MME resource pool comprises an above MME, and the UPE resource pool comprises an above UPE.Mobile subscriber in each pool area provides service by a MME resource pool and a UPE resource pool.This pool area is made up of k the E-RAN area of coverage, i.e. E-RAN
1～E-RAN
kThe MME resource pool is made up of m MME, i.e. MME
1～MME
mThe UPE resource pool is made up of n UPE, i.e. UPE
1～UPE
nInterconnect between E-RAN and MME and the UPE, form many-to-many relationship, promptly E-RAN interconnects with any MME and UPE arbitrarily, and UPE links to each other with anchor.Wherein, anchor comprises 3GPP anchor and SAE anchor, and E-RAN can be connected with UPE with MME by IP network.In the present invention, 3GPP anchor and SAE anchor can be all as one independently physical entity be provided with separately, also can be arranged in the same physical entity.MME and UPE can be all as one independently physical entity be provided with separately, also can be arranged in the same physical entity, when MME and UPE were arranged in the same physical entity, MME that describes among the present invention and the flow process between the UPE were as the device interior flow process.MME and UPE can interconnect in several ways when MME and UPE are arranged in the different physical entities, specifically adopt which kind of mode the present invention not limit, and can communicate by letter between the two gets final product.
Because between MME and the UPE is many-to-many relationship, therefore, 1 MME controls some UPE, and 1 UPE can be by some MME controls.Certainly, working control between MME and the UPE and Be Controlled relation depend on the actual disposition of network.
In system of the present invention, E-RAN is used to receive the initial message from subscriber equipment, selects serving MME for subscriber equipment from a described above MME, and sends connection request to serving MME;
Serving MME after being used to receive connection request, need to determine whether transferring user equipment, shifts if desired, and from a described above MME, be subscriber equipment select target MME; Target MME is used to described subscriber equipment that mobile management and chain of command function are provided.
Described target MME can also be further used for need determining whether the service UPE of transferring user equipment, if, select target UPE from a described above UPE then, otherwise the service UPE that this subscriber equipment last time is adhered to is as target UPE; Target UPE can be used to described subscriber equipment that user's face processing capacity is provided.
Method of the present invention utilizes the MME resource pool to provide service for the UE in the pool area, bears offered load jointly.Under the normal condition, UE provides service by same MME for it in pool area.In order to realize the load balance between the different MME in the MME pond, when UE carried out network attachment or tracing section updating process, MME was according to load and/or state, and decision is also shifted UE in other MME.
Referring to shown in Figure 3, realize that method of the present invention may further comprise the steps:
Step 301:UE and E-RAN set up wireless connections.How to set up wireless connections between UE and the E-RAN, can adopt multiple mode, but specifically adopt which kind of mode, not within discussion scope of the present invention.
Step 302: when E-RAN received initial message from subscriber equipment, E-RAN was that this subscriber equipment is selected serving MME, sends connection request to serving MME.
Described initial message is meant aloft in the interface, be used to carry the idle message that UE issues article one message of MME, for example, article one message that UE issues MME can be Attach Request message, perhaps tracing section updating request message or business request information, these message are carried in the initial message as message data.
Described serving MME is meant the MME that is selected and provide for UE service by E-RAN for UE.If UE finishes network attachment in current pool area, serving MME is exactly the current MME that adheres to of UE, otherwise serving MME is not same MME with adhering to MME, for example, when UE after other pool areas roam into this pool area for the first time during network attachment, adhere to MME and be positioned at other MME ponds, and serving MME is positioned at current MME pond.
When UE starts shooting, at first need to carry out network attachment, this moment, UE need send the initial message that contains Attach Request message to E-RAN.After UE was attached to network, UE needed the tracing section updating that carries out of cycle or timing, and this moment, UE need send the initial message that contain the tracing section updating request message to E-RAN.
Step 303: serving MME judges whether to need to shift MME, if desired, then is this UE select target MME, and this UE is attached to target MME, execution in step 304, if do not need, this UE is attached to serving MME, execution in step 304.
Step 304: this UE finishes follow-up UPE attaching process.
In the process that follow-up UPE adheres to, the MME that this subscriber equipment adheres to can reselect UPE, and subscriber equipment is attached among the selected UPE, also can directly this UE be attached to the service UPE that the last time adheres to.
If reselect UPE, subscriber equipment is attached among the selected UPE is achieved in that
The MME that this subscriber equipment adheres to selects UPE for this subscriber equipment, and adheres to request to this UPE transmission UPE; UPE is that subscriber equipment is created communication context, distributed temporary mark and IP address; Set up the user's face link between UPE and the subscriber equipment, UPE and subscriber equipment are consulted the algorithm and the parameter of encryption, send to adhere to MME then and accept message; MME receive adhere to accept message after, notifying user equipment is adhered to and is finished.Here, MME can select UPE according to one or more factors in business information, routing optimality and the home of the load of UPE and state, subscriber equipment subscription data.
In a pool area, in case UE successfully is attached to evolvement network, will provide service for UE by same MME and UPE, MME that among the present invention UE is adhered to and UPE are called and adhere to MME and adhere to UPE.Finish adhere to after, during the each access network of UE, need point out to adhere to the MME ID of MME to E-RAN, E-RAN selects serving MME according to MME ID, and will be routed to serving MME from the signaling message of UE, therefore can guarantee that UE during each access network, provides service by adhering to MME for UE in pool area.But, be balance network load, need in the MME pond, shift UE between the different MME in some cases, such as: the MME load surpasses certain upper limit, seriously transships for avoiding MME, and part UE is transferred to the lower MME of other loads; MME needs system to restart, and in a period of time, all UE is transferred among other MME before system restarts; O﹠amp; M operational order indication MME shifts part UE to other MME, for example, has disposed new MME in the MME resource pool, as newly-increased MME, or the MME of system after restarting, can bear the load of network fast for making new MME, can pass through O﹠amp; The higher MME of M order indication load shifts part UE to new MME.
Lift specific embodiment below and describe UE transfer scheme between MME among the present invention in detail.
UE in the core concept that shifts between the MME is: when UE request is adhered to or during tracing section updating, whether shift UE by the serving MME decision, and the target MME after being shifted by serving MME decision, UE only need carry out, and primary network adheres to or tracing section updating is just directly transferred to target MME.If target MME can control the current UPE that adheres to, after UE transfers to target MME, still provide service for UE by the current UPE of adhering to.Certainly, target MME also can select other UPE to provide service for UE, and for example, the UPE load is overweight in current adhering to when maybe needing to restart.
Based on above thought, UE has shifted two kinds of solutions between MME.A kind of is E-RAN heavy-route scheme, and a kind of is MME heavy-route scheme.
Scheme one: E-RAN heavy-route scheme.The characteristics of this scheme are that serving MME indication E-RAN will adhere to request or the tracing section updating request message re-routes among the intended target MME, is handled by target MME and E-RAN and adheres to request or tracing section updating.
It is example that Fig. 4 carries out tracing section updating with UE, describes the detailed process of E-RAN heavy-route scheme.
Referring to shown in Figure 4, the detailed process that present embodiment carries out tracing section updating is as follows:
Step 401: after the user start, the UE search network has also been selected evolvement network, and UE and E-RAN set up wireless connections, and E-RAN is the channel resource that UE distributes necessity, so that UE finishes follow-up flow processing, and for example network attachment flow process, tracing section updating flow process.
After step 402:UE and E-RAN set up wireless connections, send an initial message to E-RAN, contain the tracing section updating request message in the initial message, point out routing parameter to E-RAN simultaneously, that is: the MME that adheres to of UE identifies MME ID.UE carries out before the tracing section updating, has carried out network attachment usually, and has been attached among certain MME and the UPE.
Step 403:E-RAN selects serving MME according to the MME ID of UE indication, send connection request message to serving MME, the tracing section updating request message is carried in the connection request message as message data, also carries the connection identifier that E-RAN distributes for this UE in the message.Here, connection request be meant E-RAN send to MME, at article one signaling message of certain UE, the signaling that is used to certain UE to set up between E-RAN and the MME connects.
Step 404: after serving MME was received connection request, decision was shifted UE and is UE select target MME.
The reason that UE is shifted in decision may be following one or more, but be not limited to these reasons:
1) the MME load surpasses certain upper limit;
2) MME needs system to restart;
3) O﹠amp; M operational order indication MME shifts part UE to other MME.After MME receives connection request message, be to adhere to request or tracing section updating request as if what carry in the message, then MME shifts this UE, and MME is UE select target MME.
The MME that MME can not select the MME that has transshipped or the MME that is safeguarding, maybe will restart as target MME, should preferentially select to control the MME of the current UPE of adhering to, so that UE provides service by identical UPE for UE after transferring to target MME.
Step 405: serving MME is replied connection refused message to E-RAN, and indication E-RAN is re-routed to the tracing section updating request message among the target MME of appointment in message.
At least carry in the connection refused message: the sign of target MME, transfer indication or Reason For Denial, tracing section updating request message.Before step 403,, just can not carry the tracing section updating request message in the connection refused message so if E-RAN has stored the tracing section updating request message temporarily.
After step 406:E-RAN receives connection refused message, shift indication owing to carried in the message, perhaps to indicate be that UE shifts to Reason For Denial, and the target MME sign after having pointed out in the message to shift, E-RAN sends connection request message to target MME, and in message, carrying the transfer indication parameter, the tracing section updating request message still is carried in the connection request message as message data.E-RAN can distribute connection identifier for connecting again, also continues to use the connection identifier that distributes in the step 403.
Step 407: target MME accepts connection request after receiving connection request message, replys a connection response message to E-RAN, points out the connection identifier that E-RAN distributes in the message.Because having indicated UE in the connection request message of step 406 is the UE that is transferred, therefore, target MME no longer shifts this UE usually, unless target MME transships, shifts UE, execution in step 405 once more as if decision.
Step 408: target MME obtains the tracing section updating request message from connection request message, target MME checks according to the UE sign that the tracing section updating request message carries whether this UE has had communication context in this MME.Owing to be the UE that shifts, so target MME is to adhering to MME, promptly before the MME that adheres to of UE, the communication context of UE is shifted in request.If UE roams into local pool area from other pool areas, then the MME that adheres in the step 408 is positioned at other pool areas, rather than the serving MME among the figure.
Step 409:MME obtains the user profile of this UE from attaching position register (HSS), and this UE is carried out authentication, if authentication is passed through, then execution in step 410; If failed authentication, then process ends.
Here, if UE adheres to for the first time, core network side need be carried out authentication to UE, but how UE being carried out authentication exceeds the scope of the invention.For UE is not the situation of the attach to network first time, whether network side also can determine as the case may be to the UE authentication, and for example, operator can set each UE all must pass through authentication when adhering to, also can determine the authentication of carrying out, non-first attached do not carried out authentication adhering to for the first time.
Step 410: target MME points out the MME ID of target MME for this UE distributes temporary mark in the temporary mark.MME ID can be network resource identifier NRI, also can be the actual identification of MME or the sign of other types.
Step 411: target MME determines the UPE that adheres to of current UE according to the UPE ID that points out in the tracing section updating request message.If target MME can not control the UPE that adheres to of UPE ID indication, then target MME selects UPE for UE again and finishes and adhere to.Target MME sends a update request to service UPE, and carrying target MME in the message is temporary mark and the target MME ID that UE distributes.
Step 412: after service UPE receives the UPE update inquiry information, check that at first whether this UE is really attached among this UPE, upgrade the communication context of UE in UPE then, promptly storing target MME is the temporary mark that UE distributes, fresh target MME ID more, the former serving MME ID that is about to storage replaces to target MME ID.In a single day when UPE upgrades the UE communication context, can redistribute temporary mark and/or IP address for UE, but needn't reallocate usually,, can cause UE to re-execute IMS and adhere to because redistribute the IP address.
Step 413: service UPE replys a UPE to target MME and upgrades acknowledge message.If in the step 412, service UPE is that UE redistributes temporary mark and/or IP address, and then UPE upgrades in the acknowledge message and should carry temporary mark and/or IP address.
Step 414:MME sends location update message to HSS, makes HSS upgrade the position of UE and the subscription data that obtains the user from HSS, carries tracking area identification (TAID), MMEID and UE sign in the location update message at least, for example permanent sign (IMSI).
Information in the updating message of step 415:HSS memory location as TAID, MME ID and UE sign, is replied a position to MME then and is upgraded acknowledge message, carries the subscription data of user in HSS in the acknowledge message.Certainly, user's subscription data also can send to MME by other message by HSS, after MME receives subscription data, reply an acknowledge message again, for example, HSS sends one to MME again and inserts subscription data message after MME sends position renewal acknowledge message, and MME replys one and inserts the subscription data acknowledge message.But HSS may transmit user's subscription data to target MME.
Step 416: because UE is attached to target MME, therefore HSS indicates the former communication context that MME discharges UE that adheres to, the simultaneously former MME indication UPE that adheres to discharges UE communication context and default IP carrying, but owing in step 412, serve the communication context that UPE has upgraded UE, that store among the service UPE is target MME ID rather than the former MME of adhering to ID, therefore UPE can refuse the release request of the former MME of adhering to, thereby avoids serving communication context and the default IP carrying that UPE discharges UE.If that target MME selects in the step 411 is not the former UPE of adhering to, the then former UPE of adhering to will accept the indication of the former MME of adhering to, discharge UE communication context and default IP carrying.
Step 417: because UPE need realize encryption to user face data, so UE is when being attached to UPE, algorithm that UPE and UE need consult to encrypt and parameter.
UPE and UE consulted encryption algorithm and parameter can have dual mode:
Mode one, the signaling message of exchange was by the MME transparent transmission when UPE and UE consulted;
Mode two, UPE and UE directly consult by the control frame that user's face provides.
Certainly, the present invention does not limit UPE and UE how consulted encryption algorithm and parameter.
Step 418:UPE sends a UPE to MME and adheres to and accept message, and carrying UPE in the message at least is UE IP address allocated and temporary mark.
Step 419:MME receive this adhere to accept message after, reply one to UE and adhere to and accept message, carrying MME and UPE in the message at least is temporary mark and the IP address that UE distributes, and MME ID and UPE ID.Wherein, MME ID and UPE ID can be network resource identifier NRI, also can be the actual identification of MME/UPE or the sign of other types.
Step 420:UE receive this adhere to accept message after, parameters such as the temporary mark accepting to carry in the message and IP address are adhered in storage, and reply one to MME and adhere to and finish message, indicate new temporary mark and IP address to be used.
It is example that Fig. 4 carries out tracing section updating with UE, the mechanism and the process of E-RAN heavy-route scheme are described, transfer process when carrying out network attachment for UE, identical with Fig. 4, only be that interactive messages is to adhere to request, adhere to acceptance and adhere to and finish message between UE and the MME.
Scheme two: MME heavy-route scheme.The characteristics of this scheme are, MME will be routed directly to the target MME of appointment from the connection request message of E-RAN, set up signaling by target MME and E-RAN and are connected and handle and adhere to request or tracing section updating.
It is example that Fig. 5 carries out tracing section updating with UE, describes the detailed process of MME heavy-route scheme.
Referring to shown in Figure 5, the idiographic flow of MME heavy-route is as follows among the present invention:
Step 501: identical with step 401 among Fig. 4.
Step 502: identical with step 402 among Fig. 4.
Step 503: identical with step 403 among Fig. 4.
Step 504: identical with step 404 among Fig. 4.
Step 505: serving MME sends a connection request message to target MME, wherein contains in the connection request message to shift indication.
Here, serving MME sends the mode of connection request message to target MME, can be that serving MME is directly issued target MME with the packet of the connection request message received by transport layer, also can be that serving MME is encapsulated in connection request message in the signaling message of MME interface and sends to target MME.
Step 506: target MME accepts connection request, and directly replys connection response message to E-RAN, and target MME sets up signaling with E-RAN and is connected.
Step 507～519: identical with step 408 among Fig. 5～420, no longer be repeated in this description here.
It is example that Fig. 5 carries out tracing section updating with UE, the mechanism and the process of MME heavy-route scheme are described, transfer process when carrying out network attachment for UE, identical with Fig. 5, only be that interactive messages is to adhere to request, adhere to acceptance and adhere to and finish message between UE and the MME.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. method that realizes load balancing is applied to comprise at least in the system of evolution wireless access network E-RAN, an above Mobility Management Entity MME that it is characterized in that, this method may further comprise the steps:
When A.E-RAN receives from the initial message of subscriber equipment, select serving MME, send connection request to serving MME for this subscriber equipment;
If B. serving MME needs transferring user equipment, be this subscriber equipment select target MME, this subscriber equipment is attached to target MME.
2. method according to claim 1 is characterized in that, this subscriber equipment is attached to target MME step and comprises among the step B:
B11, serving MME send to E-RAN and connect the refusal response, wherein contain target MME sign;
B12, E-RAN send connection request to target MME after receiving and connecting the refusal response;
After B13, target MME receive connection request, send connection response message to E-RAN.
3. method according to claim 2 is characterized in that, after step B13, this method further comprises:
The address that B131, target MME determine the former MME that adheres to of subscriber equipment according to the temporary mark and the tracking area identification of subscriber equipment in the initial message, and migrate out the communication context of this subscriber equipment from the former MME that adheres to;
B132, target MME obtain the user profile of this subscriber equipment from attaching position register, and this subscriber equipment is carried out authentication, if authentication is passed through, then are this user equipment allocation temporary mark; Otherwise, process ends.
4. method according to claim 1 is characterized in that, the step that this subscriber equipment is attached to target MME among the step B comprises:
B21, serving MME send connection request message to target MME, wherein contain in the connection request message to shift indication;
B22, target MME accept connection request, and directly reply connection response message to E-RAN, and target MME sets up signaling with E-RAN and is connected.
5. method according to claim 4 is characterized in that, serving MME to the mode that target MME sends connection request message is among the step B21:
Serving MME is directly issued target MME with the packet of the connection request message received by transport layer, or serving MME is encapsulated in connection request message in the signaling message of MME interface and sends to target MME.
6. method according to claim 1 is characterized in that, initial message carries Attach Request message or tracing section updating request message in the steps A.
7. method according to claim 1 is characterized in that, E-RAN selects the method for serving MME to be in the steps A: select serving MME according to static configuration data, perhaps select MME according to the load information of MME.
8. method according to claim 1 is characterized in that, serving MME is to determine according to following one or more factors whether needs shift MME to this subscriber equipment among the step B:
The MME load surpasses certain upper limit, MME and needs that system restarts, MME receives orders indication need migrate out certain customers' equipment.
9. method according to claim 1 is characterized in that, described system also comprises an above user entity UPE, and after step B, this method further comprises:
C. the MME that adheres to of this subscriber equipment selects UPE for this subscriber equipment, and subscriber equipment is attached among the selected UPE.
10. method according to claim 9 is characterized in that step C comprises:
The MME that C11, this subscriber equipment adhere to selects UPE for this subscriber equipment, and adheres to request to this UPE transmission UPE;
C12, UPE are that subscriber equipment is created communication context, distributed temporary mark and IP address;
C13, set up the user's face link between UPE and the subscriber equipment, UPE and subscriber equipment are consulted the algorithm and the parameter of encrypting, and send to adhere to MME then and accept message;
C14, MME receive adhere to accept message after, notifying user equipment is adhered to and is finished.
11. method according to claim 10 is characterized in that, MME selects according to one or more factors in business information, routing optimality and the hometown-agent-address of the load of UPE and state, subscriber equipment subscription data among the step C11.
12. method according to claim 1 is characterized in that, described system also comprises an above UPE, and after step B, this method further comprises:
Among the service UPE that the MME that this subscriber equipment adheres to adheres to this subscriber equipment attached to the last time.
13. a system that realizes load balancing is characterized in that, this system comprises: the E-RAN that is connected with subscriber equipment, an above MME, wherein,
E-RAN is used to receive the initial message from subscriber equipment, selects serving MME for subscriber equipment from a described above MME, and sends connection request to serving MME;
Serving MME after being used to receive connection request, if need to determine whether transferring user equipment, is subscriber equipment select target MME from a described above MME then;
Target MME is used to described subscriber equipment that mobile management and chain of command function are provided.
14. system according to claim 13 is characterized in that, this system also comprises an above UPE,
Described target MME is further used for need determining whether the service UPE of transferring user equipment, if, select target UPE from a described above UPE, otherwise the service UPE that this subscriber equipment last time is adhered to is as target UPE;
Target UPE is used to described subscriber equipment that user's face processing capacity is provided.
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| CNA200610099478XA CN101114927A (en) | 2006-07-24 | 2006-07-24 | System and method for implementing load balancing |
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| CNA200610099478XA CN101114927A (en) | 2006-07-24 | 2006-07-24 | System and method for implementing load balancing |
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