CN106604324A - Network switching method and mobility management entity (MME) - Google Patents
Network switching method and mobility management entity (MME) Download PDFInfo
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- CN106604324A CN106604324A CN201510670725.6A CN201510670725A CN106604324A CN 106604324 A CN106604324 A CN 106604324A CN 201510670725 A CN201510670725 A CN 201510670725A CN 106604324 A CN106604324 A CN 106604324A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
Abstract
The invention discloses a network switching method. When a mobility management entity (MME) receives a handover request of UE, preset priority levels of all to-be-selected serving GPRS support nodes (SGSN) are obtained; under the circumstance that a plurality of different to-be-selected SGSNs corresponding to an LAC exist, priority levels of all the to-be-selected SGSNs are obtained; according to the priority levels of all the to-be-selected SGSNs and a preset handover strategy, an SGSN for handover is selected; and on the basis of the selected SGSN, network handover is carried out on the UE. Therefore, the switching time can be shortened and the unnecessary transmission paths can be reduced, so that the user perception can be greatly improved.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of method for switching network.The present invention also simultaneously
It is related to a kind of Mobility Management Entity MME.
Background technology
At any time LTE (Long Term Evolution, Long Term Evolution) networks are developed rapidly, current user
Scene using LTE network is also more and more diversified.Just voice call is carried out when there is user in LTE network
Situation when, if user is in mobile status, then the speech business that will appear from just carrying out faces to leave to be covered
The problem that can voice continuously continue after lid scope.
To solve this problem, 3GPP (3rd Generation Partnership Project, third generation cooperation
Partnership Program) introduce SRVCC (Single Radio Voice Call Continuity, injection in the R8 stages
Frequency continuous voice call)/eSRVCC schemes.In the SRVCC/eSRVCC implementations of 3GPP,
To realize the mobile call proceeding by LTE to 3G network, user must be switched over.Crucial
Defined in SGPP TS 23.237, otherwise referred to as session switches Session Hand-off function.As shown in figure 1,
For SRVCC network signals and data flow diagram in prior art, handoff procedure is as follows：
1st, before switching, the local terminal call path of UE (carries path and sees green solid lines, signaling paths show color
Dotted line, through the ps domain of LTE IMS is accessed；
2nd, carrying of the local terminal path of UE through CS (Circuit Switched, circuit switching) domain after switching
Access IMS (IP Multimedia Core Network Subsytem, IP multimedia network Network Subsystems).
In the handoff procedure shown in Fig. 1, the whole switchings to realize voice and Deta bearer must
Carry out external node (SGSN (Serving GPRS Support Node, Serving GPRS Support Node) and
MSC (Mobility Switch Center, mobile switching centre)) selection.It is local for SGSN
Selection is to go out RAI (Routing Area Identification, Routing Area identification) by user data diffraction,
The IP address of equipment of SGSN is obtained by the corresponding relation of RAI and SGSN.It is network overlapped in existing network
Situation is very common, and a RAI corresponds to multiple SGSN, and existing scheme is the SGSN for selecting first record
Corresponding address carries out network switching.
However, inventor has found during the present invention is realized, in above-mentioned SRVCC/eSRVCC flow processs
In, source MME wants very likely the presence of the RAI of network overlapped situation, i.e., if selection target SGSN
The multiple SGSN of correspondence, equipment random selection SGSN.But this SGSN is for the network architecture and differs
It is fixed to be adapted to, if the PGW (PDN GateWay, PDN Gateway) that SGSN is interfaced and ENB
The distance of (evolved NodeB, evolved base station) is all far, can have an impact to switching duration, meanwhile,
Such selection result is likely to result in having considerable influence to the loss of data service traffics after handover, leads
Cause to be got half the result with twice the effort in the network insertion experience of user.
The content of the invention
The invention provides a kind of method for switching network, selects priority level high by advance planning
SGSN so that the data service path distance after user's switching is as far as possible most short, so as to reduce data service
Flux depression and the access of raising user experience.The method includes：
When MME receives the handover request of UE, obtain corresponding with the LAC of the UE to be selected
Select SGSN；
If there are multiple different to be selected SGSNs corresponding with the LAC, it is retrieved as each described to be selected
The default priority of SGSN is selected, wherein, the closer to the distance of associated PGW and RNB waits to select
Distant to be selected SGSN of the priority of SGSN higher than associated PGW and RNB；
Selected for switching according to the priority and default switchover policy of each SGSN to be selected
SGSN, and network switching is carried out to the UE according to selected SGSN.
Preferably, LAI allocation lists and neighbouring SGSN allocation lists are preset in the MME, is also included：
The LAI allocation lists include the index of the SGSN that there is currently and the corresponding relation of each LAC；
The neighbouring index of the SGSN allocation lists comprising each SGSN and the SGSN's is preferential
The corresponding relation of level.
Preferably, to be selected SGSN corresponding with the LAC of the UE is obtained, specially：
Determine the LAC of the UE；
Inquire about the index of SGSN corresponding with the LAC in the LAI allocation lists, and by the rope
Draw corresponding SGSN as the SGSN to be selected.
Preferably, the priority of each SGSN to be selected is obtained, specially：
Inquire about and the corresponding priority of each index in the neighbouring SGSN allocation lists, will with it is described
Index corresponding priority and index the corresponding priority of corresponding SGSN to be selected as described.
Preferably, select to use according to the priority and default switchover policy of each SGSN to be selected
In switching SGSN, specially：
Obtain accessing user's quantity of the SGSN to be selected of highest priority；
Judge whether accessing user's quantity exceedes default number of users maximum；
If so, the SGSN to be selected of time high priority is selected to switch over as destination node；
If it is not, the SGSN to be selected for selecting the highest priority is switched over as destination node, and
Accessing user's quantity of the SGSN to be selected of the highest priority plus one.
Correspondingly, the invention allows for a kind of Mobility Management Entity MME, including：
Acquisition module, when the MME receives the handover request of terminal UE, obtains and the UE
Corresponding service universal grouping wireless service technology supporting nodes SGSN to be selected of Location Area Code LAC；
, there are multiple different acquisitions when SGSN is selected corresponding with the LAC in priority block
For the default priority of each SGSN to be selected, wherein, associated PGW and the distance of RNB
The priority of nearer SGSN to be selected is distant to be selected higher than associated PGW and RNB
Select SGSN；
Handover module, selects according to the priority and default switchover policy of each SGSN to be selected
For the SGSN of switching, and network switching is carried out to the UE according to selected SGSN.
Preferably, predeterminated position area mark LAI allocation lists and neighbouring SGSN configurations in the MME
Table, also includes：
The LAI allocation lists include the index of the SGSN that there is currently and the corresponding relation of each LAC；
The neighbouring index of the SGSN allocation lists comprising each SGSN and the SGSN's is preferential
The corresponding relation of level.
Preferably, the acquisition module specifically for：
Determine the LAC of the UE；
Inquire about the index of SGSN corresponding with the LAC in the LAI allocation lists, and by the rope
Draw corresponding SGSN as the SGSN to be selected.
Preferably, the priority block specifically for：
Inquire about and the corresponding priority of each index in the neighbouring SGSN allocation lists, will with it is described
Index corresponding priority and index the corresponding priority of corresponding SGSN to be selected as described.
Preferably, select to use according to the priority and default switchover policy of each SGSN to be selected
In switching SGSN, specially：
Obtain accessing user's quantity of the SGSN to be selected of highest priority；
Judge whether accessing user's quantity exceedes default number of users maximum；
If so, the SGSN to be selected of time high priority is selected to switch over as destination node；
If it is not, the SGSN to be selected for selecting the highest priority is switched over as destination node, and
Accessing user's quantity of the SGSN to be selected of the highest priority plus one.
As can be seen here, by applying technical scheme, when MME receives the handover request of UE,
It is retrieved as the respectively default priority of SGSN to be selected, and it is multiple different corresponding with LAC to be selected existing
The priority of respectively SGSN to be selected is obtained in the case of selecting SGSN, and according to the preferential of respectively SGSN to be selected
Level and default switchover policy select the SGSN for switching, and according to selected SGSN to institute
Stating UE carries out network switching.So as to shortening switching duration and reducing unnecessary transmission path, make
User perceptibility is greatly improved.
Description of the drawings
Fig. 1 is SRVCC network signals and data flow diagram in prior art,
Fig. 2 is a kind of schematic flow sheet of method for switching network proposed by the present invention；
Fig. 3 is SRVCC network signals and data flow diagram in the specific embodiment of the invention；
Fig. 4 is a kind of structural representation of MME proposed by the present invention.
Specific embodiment
For the technical problem in the presence of prior art, the present invention proposes a kind of method for switching network,
By considering the distance between PGW and ENB when MME switches over selection SGSN equipment, in advance
Adjacent device and SGSN network distances are first calculated, same RAI correspondences SGSN is set and is selected priority, so as to
Accelerate handoff procedure and reduce the wasting of resources of later data business.
As shown in Fig. 2 for a kind of schematic flow sheet of method for switching network proposed by the present invention including following
Step：
S201, when MME receives the handover request of UE, obtains treat corresponding with the LAC of the UE
Select SGSN.
In order to realize selecting suitable target SGSN, being preferable to carry out in the application for handover source MME
In example, LAI allocation lists and neighbouring SGSN allocation lists, wherein LAI allocation lists bag are preset in the MME
The corresponding relation of the index containing the SGSN that there is currently and each LAC, and neighbouring SGSN allocation lists are comprising each
The corresponding relation of the priority of the index of the SGSN and the SGSN.So when need obtain with
The LAC of the UE is corresponding can first to determine the LAC of the UE when SGSN is selected, and subsequently exist
The index of SGSN corresponding with the LAC is inquired about in the LAI allocation lists, and the index is corresponding
SGSN is used as the SGSN to be selected.
In specific embodiment as shown in Figure 3, the application sets MME at the networking initial stage according to the network planning
The access priority of adjacent SGSN, for same RAI correspondence difference SGSN situations, according to SGSN and its phase
The distance exam path of the PGW and RNB of association, completes such as by latitude, longitude difference, by
This setting LAI selects the preferred rank of SGSN.Distance is nearer, and rank is higher.If user will be cut
Change, MME is when the situation of the multiple SGSN of LAI correspondences of user is inquired about, and preference level is high
SGSN.For example select SGSN1 necessarily than selecting SGSN3 to save switching time, so as to subsequently switch
The perceptibility of user is significantly improved in journey.
In above-mentioned specific embodiment, LAI allocation lists are as shown in table 1 below：
Table 1
LAI tables are configured at mme locally, and wherein MmeRaiIndex represents the unique index of all configuration RAI；
MmeRaiPlmn represents that the plmn belonging to RAI, mmeRaiLac represent the corresponding LAC of RAI；
MmeRaiRac represents the corresponding RAC of RAI；MmeAdjMscVlrInfoIndex represents that RAI is corresponding
The index of SGSN nodes.Wherein table 4-1mmeAdjMscVlrInfoIndex fields and table 4-2 pass through
MmeAdjSgsnIndex is interrelated, i.e. LAI finds correspondence by mmeAdjMscVlrInfoIndex
SGSN addresses.
MME is then as shown in table 2 adjacent to SGSN allocation lists：
Table 2
The table is equally configured at MME locally, and MmeAdjSgsnIndex represents SGSN indexes；
MmesgsnRowStatus represents whether the record is effective；SgsnIpVer represents the IP types of SGSN equipment
(IPV4, IPV6)；SgsnIp represents the IP address of the node；MmeAdjSgsnPri represents SGSN equipment
Priority；MmeSgsnUserMax represents maximum access customer number.
It should be noted that
S202, if there are multiple different to be selected SGSNs corresponding with the LAC, is retrieved as each described
The default priority of SGSN to be selected, wherein, the closer to the distance of associated PGW and RNB waits to select
Distant to be selected SGSN of the priority of SGSN higher than associated PGW and RNB.
Based on the setting in S201, in the preferred embodiment of the application, the step is by described neighbouring
Inquire about in SGSN allocation lists and the corresponding priority of each index, will be with the corresponding priority of the index
The corresponding priority of corresponding SGSN to be selected is indexed as described.
By taking the table 2 of table 1 as an example, for the ease of inquiry, the mmeAdjMscVlrInfoIndex words of LAI allocation lists
Section and neighbouring SGSN allocation lists are interrelated by MmeAdjSgsnIndex, therefore are specifically implementing
Cheng Zhong, it is possible to use LAI finds corresponding SGSN addresses by mmeAdjMscVlrInfoIndex.
S203, selects for cutting according to the priority and default switchover policy of each SGSN to be selected
The SGSN for changing, and network switching is carried out to the UE according to selected SGSN.
Equipment is excessively caused to be born in order to avoid the SGSN of limit priority there may be accessing user's quantity
The excessive situation of lotus, the preferred embodiment of the application is provided with corresponding maximum for the SGSN of limit priority
Accessing user's quantity, when needing to select the SGSN for switching, obtains first the to be selected of highest priority
Accessing user's quantity of SGSN is selected, subsequently determines whether whether accessing user's quantity exceedes default number of users
Amount maximum, if then selecting the SGSN to be selected of time high priority to switch over as destination node, if
The SGSN to be selected for otherwise selecting the highest priority is switched over as destination node, and will be described excellent
Accessing user's quantity of first level highest SGSN to be selected plus one.
Based on above-mentioned flow process, for user from 4G calling networks when move to 3G network and complete call proceeding
Situation, source MME switch selection target SGSN when, be shorten switching time and improve user sense
Know, according to the high SGSN of the preferred rank of priority of setting, if there are multiple users in certain time period
Same SGSN is all selected, maximum accessing user can be set, now select sub-priority SGSN, it is ensured that
Call network is normally accessed.
By taking Fig. 3 as an example, in the specific embodiment corresponding to the figure, when user switches, due to network overlapped,
Mme is caused to find the LAI (PLMN of user：08001；LAC：256；RAC：32) choose
3 indexes, that is, corresponded to 3 SGSN, is calculated in advance according to network, selects the highest priority of setting
SGSN, MME select priority to switch over for the SGSN of 1 (mmeAdjSgsnPri=1).So may be used
Reduce the time of switching.
Meanwhile, access to avoid the occurrence of a large number of users, all select setting in the node, MME certain hours
Node maximum number of user SGSN_USER_MAX, sets 100 users such as in 10 minutes, often accesses
One user, number of users is increased, such as the (IP address that priority is 1：192.168.50.12)
SGSN reached in 10 minutes access the upper limit 100 when, when another user carries out voice switching, select
Same SGSN, it is seen that customer volume reaches maximum, selects (the SGSN of mmeAdjSgsnPri=2 of priority 2
(IP address：192.168.50.23) target SGSN, switch over as destination node.It is simultaneously cumulative
Access customer number be purged in per 10 minutes, recalculate.By this method, so can advise
Keep away the congestion of network.
After being finished according to the switching of above-mentioned flow process, due to have selected proximal device, shorten SGSN and adjoin
Channel distance between equipment (PGW/ENB), i.e. select the road of SGSN1 (blue solid lines) in Fig. 4-1
Electrical path length substantially than select SGSN3 (orange solid line) path it is short, thus come shorten switching after
The path of data service stream, for Flux Loss has certain improvement.
Furthermore, it is necessary to explanation, the Sv interfaces for SRVCC/eSRVCC, i.e. MME selection MSC
When, also dependent on the network planning, in the case where there are the multiple MSC/VLR of RAI correspondences, can be by pre-
First configuration definition priority, saves path loss, shortens switching time.And the above technology of the present invention
Scheme is not only applicable to SRVCC/eSRVCC, and for multi-internet integration, external node selects also follow this
Class method is reducing the duration of Path selection.Improve the perceptibility of user.
To reach above technical purpose, the invention allows for a kind of Mobility Management Entity MME, such as Fig. 4
It is shown, including：
Acquisition module 410, when the MME receives the handover request of terminal UE, obtains and the UE
Corresponding service universal grouping wireless service technology supporting nodes SGSN to be selected of Location Area Code LAC；
, there is multiple different corresponding with the LAC obtain when SGSN is selected in priority block 420
Be taken as the default priority of each SGSN to be selected, wherein, associated PGW and the distance of RNB compared with
Distant higher than the PGW and RNB being associated of the priority of near SGSN to be selected is waited to select
SGSN；
Handover module 430, selects according to the priority and default switchover policy of each SGSN to be selected
The SGSN for switching is selected, and network switching is carried out to the UE according to selected SGSN.
In specific application scenarios, mark LAI allocation lists and neighbouring in predeterminated position area in the MME
SGSN allocation lists, also include：
The LAI allocation lists include the index of the SGSN that there is currently and the corresponding relation of each LAC；
The priority of the neighbouring index of the SGSN allocation lists comprising each SGSN and the SGSN
Corresponding relation.
In specific application scenarios, the acquisition module specifically for：
Determine the LAC of the UE；
Inquire about the index of SGSN corresponding with the LAC in the LAI allocation lists, and by the index
Corresponding SGSN is used as the SGSN to be selected.
In specific application scenarios, the priority block specifically for：
Inquire about and the corresponding priority of each index in the neighbouring SGSN allocation lists, will be with the rope
Draw corresponding priority and index the corresponding priority of corresponding SGSN to be selected as described.
Priority and default switching in specific application scenarios, according to each SGSN to be selected
Policy selection is used for the SGSN of switching, specially：
Obtain accessing user's quantity of the SGSN to be selected of highest priority；
Judge whether accessing user's quantity exceedes default number of users maximum；
If so, the SGSN to be selected of time high priority is selected to switch over as destination node；
If it is not, the SGSN to be selected for selecting the highest priority is switched over as destination node, and will
Accessing user's quantity of the SGSN to be selected of the highest priority plus one
Through the above description of the embodiments, those skilled in the art can be understood that this
It is bright to be realized by hardware, it is also possible to realize by the mode of software plus necessary general hardware platform.
Based on such understanding, technical scheme can be embodied in the form of software product, and this is soft
It (can be CD-ROM, USB flash disk is mobile hard that part product can be stored in a non-volatile memory medium
Disk etc.) in, including some instructions are used so that a computer equipment (can be personal computer, take
Business device, or the network equipment etc.) perform method described in each implement scene of the invention.
It will be appreciated by those skilled in the art that accompanying drawing is a schematic diagram for being preferable to carry out scene, in accompanying drawing
Module or flow process not necessarily implement necessary to the present invention.
It will be appreciated by those skilled in the art that the module in the device in implement scene can be according to implement scene
Description carries out being distributed in the device of implement scene, it is also possible to carries out respective change and is disposed other than this enforcement
In one or more devices of scene.The module of above-mentioned implement scene can merge into a module, also may be used
To be further split into multiple submodule.
The invention described above sequence number is for illustration only, does not represent the quality of implement scene.
Disclosed above is only that the several of the present invention are embodied as scene, but, the present invention is not limited to
This, the changes that any person skilled in the art can think of should all fall into protection scope of the present invention.
Claims (10)
1. a kind of method for switching network, it is characterised in that include：
When Mobility Management Entity MME receives the handover request of terminal UE, obtain and the UE
Corresponding service universal grouping wireless service technology supporting nodes SGSN to be selected of Location Area Code LAC；
If there are multiple different to be selected SGSNs corresponding with the LAC, it is retrieved as each described to be selected
The default priority of SGSN is selected, wherein, associated public data network PDN Gateway PGW and RNB
SGSN to be selected closer to the distance priority it is distant higher than associated PGW and RNB
SGSN to be selected；
Selected for switching according to the priority and default switchover policy of each SGSN to be selected
SGSN, and network switching is carried out to the UE according to selected SGSN.
2. the method for claim 1, it is characterised in that predeterminated position area mark in the MME
Know LAI allocation lists and neighbouring SGSN allocation lists, also include：
The LAI allocation lists include the index of the SGSN that there is currently and the corresponding relation of each LAC；
The neighbouring index of the SGSN allocation lists comprising each SGSN and the SGSN's is preferential
The corresponding relation of level.
3. method as claimed in claim 2, it is characterised in that obtain corresponding with the LAC of the UE
SGSN to be selected, specially：
Determine the LAC of the UE；
Inquire about the index of SGSN corresponding with the LAC in the LAI allocation lists, and by the rope
Draw corresponding SGSN as the SGSN to be selected.
4. method as claimed in claim 3, it is characterised in that obtain each SGSN's to be selected
Priority, specially：
Inquire about and the corresponding priority of each index in the neighbouring SGSN allocation lists, will with it is described
Index corresponding priority and index the corresponding priority of corresponding SGSN to be selected as described.
5. the method as described in any one of claim 1-4, it is characterised in that described wait to select according to each
The priority of SGSN and default switchover policy select the SGSN for switching, specially：
Obtain accessing user's quantity of the SGSN to be selected of highest priority；
Judge whether accessing user's quantity exceedes default number of users maximum；
If so, the SGSN to be selected of time high priority is selected to switch over as destination node；
If it is not, the SGSN to be selected for selecting the highest priority is switched over as destination node, and
Accessing user's quantity of the SGSN to be selected of the highest priority plus one.
6. a kind of Mobility Management Entity MME, it is characterised in that include：
Acquisition module, when the MME receives the handover request of terminal UE, obtains and the UE
Corresponding service universal grouping wireless service technology supporting nodes SGSN to be selected of Location Area Code LAC；
, there are multiple different acquisitions when SGSN is selected corresponding with the LAC in priority block
For the default priority of each SGSN to be selected, wherein, associated PGW and the distance of RNB
The priority of nearer SGSN to be selected is distant to be selected higher than associated PGW and RNB
Select SGSN；
Handover module, selects according to the priority and default switchover policy of each SGSN to be selected
For the SGSN of switching, and network switching is carried out to the UE according to selected SGSN.
7. MME as claimed in claim 6, it is characterised in that predeterminated position area in the MME
Mark LAI allocation lists and neighbouring SGSN allocation lists, also include：
The LAI allocation lists include the index of the SGSN that there is currently and the corresponding relation of each LAC；
The neighbouring index of the SGSN allocation lists comprising each SGSN and the SGSN's is preferential
The corresponding relation of level.
8. MME as claimed in claim 7, it is characterised in that the acquisition module specifically for：
Determine the LAC of the UE；
Inquire about the index of SGSN corresponding with the LAC in the LAI allocation lists, and by the rope
Draw corresponding SGSN as the SGSN to be selected.
9. MME as claimed in claim 8, it is characterised in that the priority block specifically for：
Inquire about and the corresponding priority of each index in the neighbouring SGSN allocation lists, will with it is described
Index corresponding priority and index the corresponding priority of corresponding SGSN to be selected as described.
10. the MME as described in any one of claim 6-9, it is characterised in that according to each described to be selected
Select SGSN priority and default switchover policy select for switching SGSN, specially：
Obtain accessing user's quantity of the SGSN to be selected of highest priority；
Judge whether accessing user's quantity exceedes default number of users maximum；
If so, the SGSN to be selected of time high priority is selected to switch over as destination node；
If it is not, the SGSN to be selected for selecting the highest priority is switched over as destination node, and
Accessing user's quantity of the SGSN to be selected of the highest priority plus one.
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| CN101754354A (en) * | 2008-12-01 | 2010-06-23 | 中国移动通信集团公司 | Heartbeat control device as well as roaming addressing system and method |
| CN102238674A (en) * | 2010-04-30 | 2011-11-09 | 电信科学技术研究院 | Service switching method and equipment from PS (Packet Switched) domain to 2G/3G network |
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