CN101291536A - Switching method for load rebalance of mobility management entity - Google Patents
Switching method for load rebalance of mobility management entity Download PDFInfo
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Abstract
The invention provides a method for switching the load weight balancing of a mobile management entity, comprising the following steps that: when a source mobile management entity needs to switch the load weight balancing of the mobile management entity to one or a plurality of user devices attached to the source mobile management entity, the source mobile management entity sends a transmitting and repositioning request which carries a switching reason to a target mobile management entity; after the target mobile management entity receives the transmitting repositioning request, if the switching reason represents the mobile management entity load weight balancing, the target mobile management entity launches a position updating flow of the user device after a data link in a core network completes the switching, allocates new global unique temporary identification for the user device through a global unique temporary identification reallocated flow to complete the switching of the load weight balancing. The technical proposal of the invention is adopted, so when the switching of the load weight balancing occurs, the normal operation of the succeeder of the user device and the network intercommunicative and the continuousness of a session are guaranteed.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind ofly under the load rebalance of mobility management entity scene, be to keep the changing method of conversation continuity.
Background technology
In order to keep the competitiveness of 3-G (Generation Three mobile communication system) in the communications field, 3GPP (3rdGeneration Partnership Project, third generation partner program) the standard operation group just is being devoted to the research of EPS (Evolved Packet System, evolution grouping domain system).Whole EPS system as shown in Figure 1, mainly comprise E-UTRAN (Evolved Universal Terrestrial Radio Access Network, the universal terrestrial access network of evolution) and EPC (Evolved Packet Core, the packet-based core networks of evolution) two parts.The EPC of this system can support the access of user from GERAN (GSM EDGE radioaccess network, GSM EDGE wireless access network) and UTRAN (Universal TerrestrialRadio Access Network, universal land radio access web).
In the EPC packet-based core networks, mainly comprised HSS (Home Subscriber Server, the home subscriber data server), MME (Mobility Management Entity, Mobility Management Entity), S-GW (Serving Gateway, gateway) and P-GW (PDN Gateway, grouped data network gateway), wherein:
HSS (Home Subscriber Server): the home subscriber data server is the permanent storage place of user contracting data, is positioned at the home network that the user contracts;
MME (Mobility Management Entity): Mobility Management Entity, be the storage place of user contracting data in current network, be responsible for NAS layer (Non-Access Stratum, the Non-Access Stratum) signaling management of terminal to network, tracking and paging management function and the bearer management under user's idle pulley;
S-GW (Serving Gateway, gateway): gateway, be the gateway that core net arrives wireless system, be responsible for terminal to the user plane bearer of core net, the metadata cache under the terminal idle pulley, function, legal eavesdropping and grouped data route and the forwarding capability that network side is initiated service request;
P-GW (PDN Gateway): grouped data network gateway is the grouping domain system (EPS) of evolution and the gateway of this system's external network, functions such as the IP address assignment of responsible terminal, billing function, grouping packet filtering, application of policies.
In the EPS system, as shown in Figure 2, a plurality of MME can constitute a pond, are called MME pool (MME pond).The introducing of this notion mainly is in order to utilize the network capacity resource better, prevents that the situation that overload or capacity do not make full use of from appearring in indivedual MME, and can obviously reduce the signaling traffic of network.MME load balance (Mobility Management Entity load balance) is a function in MME pond, it can make that eNB (base station) is that the UE (subscriber equipment) that enters this pond selects to be linked on the suitable MME of load according to the load sharing algorithm, reduces the possibility of follow-up change MME as far as possible.If UE is linked into MME that load is suitable in the pond, UE does not need to change the MME of service for it when mobile in this MME pond coverage so, causes the mutual signaling that core net is too much and the signaling consumption of wave point to avoid because MME changes.By this function of MME load balance, the load of all MME can reach the state of a balance in the pond, more fast and effeciently is user's service.
But the MME node that (power down, hardware/software fault, system restart etc.) causes because the physics aspect breaks down or eNB does not have the load of timely perception MME, and certain MME overload that causes or unusual causes this MME not serve for the UEs that inserts this MME again.In order to handle this abnormality, network need start MME load rebalance (load rebalance of mobility management entity) function, as shown in Figure 2, this function is by MME notice this MME of eNB overload of overload, eNB need reset the weight of this MME on the one hand to guarantee not having new UE to insert this MME, also need on the other hand with the UE that inserts this MME move to other not fault or not the overload MME under, reach load balance again.
Switching flow all is based on the scene of position change between current MME, also be that UE switches between different eNB, because the UE of this moment moves to the TA (tracking area) outside the tracking area tabulation coverage of source MME, therefore after switching is finished, UE can initiatively initiate TAU (Tracking AreaUpdate, tracing section updating) flow process with the information registering of the new MME that UE switched in the middle of HSS.But open MME load rebalance function with the scene that reaches the heavy balance of load under, UE does not have the change of occurrence positions, be that UE is switching between different MME under the same eNB, because TA (tracking area) does not change, UE is also within current tracking area tabulation coverage, thereby can not trigger the information updating of new MME in the log-on message of HSS by TAU, and UE also can't obtain new GUTI (global unique temporary identity) and cause core net can't distinguish UE, this can cause the obstacle of follow-up UE and core net aspect signalling interworking, therefore can't guarantee the continuous of session.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of changing method of load rebalance of mobility management entity, and when the heavy balance of load taking place switch, can guarantee effectively that UE is follow-up carries out and conversation continuity normally with flow process network interworking.
In order to address the above problem, the invention provides a kind of changing method of load rebalance of mobility management entity, comprising:
When the source Mobility Management Entity need carry out the load rebalance of mobility management entity switching to the one or more subscriber equipmenies that adhere to, the source Mobility Management Entity carried switch reasons in the forwarding re-positioning request that target mobility management entity sends; After described target mobility management entity is received described forwarding re-positioning request, if switch reasons represents it is load rebalance of mobility management entity, then the data link in core net is switched the position new technological process more finish the described subscriber equipment of back initiation, and be that described subscriber equipment distributes new global unique temporary identity by the heavy allocation flow of global unique temporary identity, finish the switching of the heavy balance of load.
Further, described method further comprises:
(a) when the source Mobility Management Entity because excess load or break down need be carried out load rebalance of mobility management entity to the one or more subscriber equipmenies that adhere to when switching, the source Mobility Management Entity sends the load rebalance of mobility management entity switching command to the base station, select target Mobility Management Entity behind the described load rebalance of mobility management entity switching command is received in described base station, return the sign or the address information of target mobility management entity then to described source Mobility Management Entity, execution in step (b);
(b) described source Mobility Management Entity sends to target mobility management entity and transmits re-positioning request, wherein carries described customer equipment identification, target mobility management entity sign or its address information, and switch reasons, execution in step (c);
(c) to judge according to the switch reasons in the described forwarding re-positioning request be that load rebalance of mobility management entity switches to described target mobility management entity, then the data link in core net is switched and to be finished the position new technological process more of initiating described subscriber equipment in the back, and is the new global unique temporary identity of described user equipment allocation by global unique temporary identity weight allocation flow.
Further, in the described step (b), in any one carries described switch reasons in the following manner:
Increasing an expression switch reasons in transmitting re-positioning request is the information unit parameter of load rebalance of mobility management entity;
The sign of in transmitting re-positioning request, carrying source base station;
Parameter item at the newly-increased expression load rebalance of mobility management entity in switch reasons value the inside.
Further, in the described step (c), described target mobility management entity is initiated the position updating steps and is comprised:
Target mobility management entity is initiated location update request message to the home subscriber data server, wherein carries customer equipment identification;
After described home subscriber data server is received described location update request message, the registration of cancellation source Mobility Management Entity in the home subscriber data server, delete the log-on message of described subscriber equipment in the Mobility Management Entity of source, and the data of described subscriber equipment are inserted described target mobility management entity.
Further, in the described step (c), the step that described home subscriber data server is cancelled the log-on message of described subscriber equipment in the Mobility Management Entity of source comprises:
The home subscriber data server sends the canceling position signaling to the source Mobility Management Entity, wherein carries sign, the cancellation type of described subscriber equipment;
Described source Mobility Management Entity is deleted behind the log-on message of described subscriber equipment to home subscriber data server home position cancellation response.
Further, in the described step (c), target mobility management entity sends the heavy assignment commands of global unique temporary identity to described subscriber equipment, wherein carry the new global unique temporary identity into its distribution, described subscriber equipment returns global unique temporary identity Reallocation Complete message to it after receiving the heavy assignment commands of described global unique temporary identity.
Further, in the described step (c), target mobility management entity also is the new tracking area tabulation of described user equipment allocation, and carries described new tracking area tabulation in the heavy assignment commands of described global unique temporary identity.
In sum, the invention provides a kind of changing method of load rebalance of mobility management entity, when needs carry out MME load rebalance switching, source MME carries switch reasons when target MME sends the forwarding re-positioning request, after finishing, the data link switching of target MME in core net initiatively initiate the position of this UE is upgraded, and be that UE distributes new GUTI sign by the heavy allocation flow of GUTI, therefore, having guaranteed effectively that UE is follow-up carries out and conversation continuity normally with flow process network interworking.
Description of drawings
Fig. 1 is the system construction drawing of correlation technique evolution packet network (EPS);
Fig. 2 is the schematic diagram of MME load rebalance function;
Fig. 3 is that the present invention realizes the overview flow chart that MME load rebalance switches;
Fig. 4 finishes the flow chart that MME load rebalance switches in the embodiment of the invention.
Embodiment
The invention provides a kind of changing method of load rebalance of mobility management entity, as shown in Figure 3, when needs carry out MME load rebalance switching, source MME carries switch reasons when sending the forwarding re-positioning request to target MME, after target MME receives and transmits re-positioning request, if judge that switch reasons is MME load rebalance, then the data link in core net is switched and to be finished the back and initiate the position of this UE new technological process more, and is that UE distributes new GUTI to identify by the heavy allocation flow of GUTI.The switching of MME load rebalance occurs between the different MME in the same MME pond, but the UE of this moment still is under the same eNB.
When source MME owing to excess load or reason such as break down need be carried out MME load rebalance to the one or more UE that adhere to when switching, source MME can send MME load rebalance switching command to the eNB that UE connected that needs shift, a MME load rebalance switching command only is represented as a UE and initiates switching flow, if have a plurality of UE to shift then this order needs repeatedly to send to switch one by one, following examples are for to carry out the description of switching flow to a UE.
Present embodiment provides the changing method of the heavy balance of a kind of load, as shown in Figure 4, may further comprise the steps:
Step 401: source MME need will be moved to the not target MME of excess load of another one attached to following UE by handoff procedure owing to excess load or reason such as break down, and therefore send MME load rebalance switching command to eNB;
Step 402:eNB selects suitable target MME according to factors such as each MME load capacity in the pond by the load sharing algorithm after receiving MME load rebalance switching command, and sign or the address information of the target MME that send to select to source MME, need carry out the parameters such as carrying tabulation of data forwarding, the data link of promptly carrying out in the core net is switched required parameter;
The eNB that is connected to the MME pond is each the MME load capacity weighted value in the record pond of having the ability, so factors such as the physical capacity of comprehensive each MME of its meeting, CPU disposal ability, in this MME pond, select the target MME that is fit to switch to by concrete load sharing algorithm (algorithm is realized according to the product of different manufacturers may be different and irrelevant with summary of the invention, therefore is not described in detail).
Step 403: source MME sends to target MME and transmits re-positioning request, except comprising UE sign (as being IMSI), target MME sign or parameters such as address information and mobile management context, need also to inform that the reason that target MME this time switches is MME load rebalance;
The mode of informing this switch reasons of target MME can be any one in the following mode: (1) increases an expression switch reasons in transmitting re-positioning request be IE (information unit) parameter of MME load rebalance; Whether (2) sign of carrying source eNB in transmitting re-positioning request, sign that target MME can comparison object eNB and the sign of source eNB be identical and then judge that whether type of this time switching is the MME load rebalance that occurs in below the same eNB; (3) parameter item of a newly-increased expression MME load rebalance in cause (switch reasons) value the inside, if adopt (3) kind mode, each MME need arrange the implication of this parameter item, target MME resolves this newly-increased parameter and obtains switch reasons.
Step 404: target MME receives the forwarding re-positioning request, know that switch reasons is MME loadrebalance, send handoff request message to eNB then, comprise the parameters such as up TEID of S-GW address and user's face, eNB creates context, carrying and the safe context of UE again;
Step 405:eNB returns switch acknowledgment message and gives target MME, comprises information such as address, user name tunnel;
Step 406: target MME sends to source MME and transmits relocation response message;
Step 407: source MME sends switching command to eNB, and indication eNB finishes switching;
Send switching to target MME after step 408:eNB finishes and switches and finish notice, inform that the wireless side switching finishes;
Step 409: target MME sends the forwarding reorientation to source MME and finishes, and notification source MME switching is finished;
Step 410: source MME finishes to target MME transmission forwarding reorientation and replys;
Step 411: target MME sends more new bearer request to S-GW, writes down information such as the address of eNB and Tunnel Identifier again at S-GW;
Step 412: if carried out the reorientation of S-GW simultaneously in handoff procedure, so new S-GW can distribute information such as the address of S-GW and Tunnel Identifier for downlink data, and is carrying above-mentioned information in the renewal bearing request message that sends to P-GW;
If do not carry out the reorientation of S-GW in handoff procedure, this step can be omitted and not send so, and the downlink data of S-GW can send to eNB immediately.
Step 413: if P-GW receives the renewal bearing request message, then reply to upgrade bearing response message, in message, comprise information such as the address of P-GW and TEID to S-GW;
Step 414:S-GW returns more the new bearer response to target MME, and the purpose GTP-C Tunnel Identifier of S-GW appointment, self address and the address of P-GW and tunnel information etc. are returned to target MME;
Step 415: the data link switching in the core net is finished, and the up-downgoing data are transmitted by the system after switching;
Step 416: after the data link switching in the core net is finished, because of switch reasons is MME loadrebalance, therefore target MME initiatively initiates position renewal and the heavy allocation flow of GUTI, promptly initiate location update request message to HSS, the change of the registered location of notice HSS UE, the information such as sign (IMSI), target MME address of wherein carrying this UE;
Step 417:HSS keeps single registration principle to UE, therefore need the registration of cancellation source MME in HSS, and delete the log-on message of this UE in the MME of source, therefore send the canceling position signaling to source MME, wherein carry sign (IMSI), the information such as cancellation type etc. of this UE, HSS only safeguards the registration of UE at target MME;
Step 418: the log-on message of source MME deletion UE, as data such as mobile management contexts, then to HSS home position cancellation response;
Step 419:HSS inserts the data of UE to target MME;
Step 420: target MME returns to HSS and inserts the user data response;
The execution of step 419 and step 417 is order in no particular order.
Step 421:HSS upgrades acknowledge message to target MME home position;
It is that UE distributes new GUTI that step 422: target MME initiates the heavy allocation flow of GUTI, can also distribute new tracking area tabulation as needs, target MME sends the heavy assignment commands of GUTI to UE, carry new GUTI for its distribution, if distributed new tracking area tabulation, also carry new tracking area tabulation into its distribution.
Step 423:UE returns the GUTI Reallocation Complete message to MME.
By above-mentioned UE position more new technological process with target MME information registering in HSS, and be that UE distributes new GUTI by the heavy allocation flow of GUTI, UE just can successfully be registered to target MME like this, guarantees follow-up and flow process network interworking can normally be carried out.
Claims (7)
1, a kind of changing method of load rebalance of mobility management entity is characterized in that:
When the source Mobility Management Entity need carry out the load rebalance of mobility management entity switching to the one or more subscriber equipmenies that adhere to, the source Mobility Management Entity carried switch reasons in the forwarding re-positioning request that target mobility management entity sends; After described target mobility management entity is received described forwarding re-positioning request, if switch reasons represents it is load rebalance of mobility management entity, then the data link in core net is switched the position new technological process more finish the described subscriber equipment of back initiation, and be that described subscriber equipment distributes new global unique temporary identity by the heavy allocation flow of global unique temporary identity, finish the switching of the heavy balance of load.
2, the method for claim 1 is characterized in that, described method further comprises:
(a) when the source Mobility Management Entity because excess load or break down need be carried out load rebalance of mobility management entity to the one or more subscriber equipmenies that adhere to when switching, the source Mobility Management Entity sends the load rebalance of mobility management entity switching command to the base station, select target Mobility Management Entity behind the described load rebalance of mobility management entity switching command is received in described base station, return the sign or the address information of target mobility management entity then to described source Mobility Management Entity, execution in step (b);
(b) described source Mobility Management Entity sends to target mobility management entity and transmits re-positioning request, wherein carries described customer equipment identification, the sign of target mobility management entity or its address information, and switch reasons, execution in step (c);
(c) to judge according to the switch reasons in the described forwarding re-positioning request be that load rebalance of mobility management entity switches to described target mobility management entity, then the data link in core net is switched and to be finished the position new technological process more of initiating described subscriber equipment in the back, and is the new global unique temporary identity of described user equipment allocation by global unique temporary identity weight allocation flow.
3, method as claimed in claim 2 is characterized in that:
In the described step (b), in any one carries described switch reasons in the following manner:
Increasing an expression switch reasons in transmitting re-positioning request is the information unit parameter of load rebalance of mobility management entity;
The sign of in transmitting re-positioning request, carrying source base station;
Parameter item at the newly-increased expression load rebalance of mobility management entity in switch reasons value the inside.
4, method as claimed in claim 2 is characterized in that: in the described step (c), described target mobility management entity is initiated the position updating steps and is comprised:
Target mobility management entity is initiated location update request message to the home subscriber data server, wherein carries customer equipment identification;
After described home subscriber data server is received described location update request message, the registration of cancellation source Mobility Management Entity in the home subscriber data server, delete the log-on message of described subscriber equipment in the Mobility Management Entity of source, and the data of described subscriber equipment are inserted described target mobility management entity.
5, method as claimed in claim 4 is characterized in that: in the described step (c), the step that described home subscriber data server is deleted the log-on message of described subscriber equipment in the Mobility Management Entity of source comprises:
The home subscriber data server sends the canceling position signaling to the source Mobility Management Entity, wherein carries sign, the cancellation type of described subscriber equipment;
Described source Mobility Management Entity is deleted behind the log-on message of described subscriber equipment to home subscriber data server home position cancellation response.
6, method as claimed in claim 2 is characterized in that:
In the described step (c), target mobility management entity sends the heavy assignment commands of global unique temporary identity to described subscriber equipment, wherein carry the new global unique temporary identity into its distribution, described subscriber equipment returns global unique temporary identity Reallocation Complete message to it after receiving the heavy assignment commands of described global unique temporary identity.
7, method as claimed in claim 6 is characterized in that:
In the described step (c), target mobility management entity also is the new tracking area tabulation of described user equipment allocation, and carries described new tracking area tabulation in the heavy assignment commands of described global unique temporary identity.
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| CN109005564B (en) * | 2018-08-23 | 2021-11-30 | 安科讯(福建)科技有限公司 | Method and system for distributing MME (mobility management entity) load |
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| CN110958651B (en) * | 2018-09-26 | 2022-06-14 | 成都鼎桥通信技术有限公司 | Core network reselection method and device |
| CN110719615A (en) * | 2019-10-21 | 2020-01-21 | 广州爱浦路网络技术有限公司 | Method for user terminal to switch base station attachment |
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