CN105451359A - Terminal access method and device in digital trunking communication system - Google Patents
Terminal access method and device in digital trunking communication system Download PDFInfo
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- CN105451359A CN105451359A CN201410416014.1A CN201410416014A CN105451359A CN 105451359 A CN105451359 A CN 105451359A CN 201410416014 A CN201410416014 A CN 201410416014A CN 105451359 A CN105451359 A CN 105451359A
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Abstract
The invention discloses a terminal access method in a digital trunking communication system. The method comprises steps that a base station receives a message sent from a terminal when the terminal gets access to a core network, wherein the message carries a virtual service provider identifier read by the terminal from a terminal identifier, the values of assigned fields in the terminal identifier are the virtual service provider identifiers used for identifying departments, and a HSS sets the terminal identifier of the terminal according to the virtual service provider identifier of the department where the terminal is located when opening an account for the terminal; the base station enables the terminal to get access to the core network corresponding to the virtual service provider identifier according to a self-stored corresponding relation between the virtual service provider identifiers and the core networks and the virtual service provider identifier sent from the terminal. The terminal access method may easily enable the terminal to get access to the core networks corresponding to different departments via the base station.
Description
Technical field
The application relates to the communication technology, the terminal access method particularly in digital clustering communication system and device.
Background technology
In the application of LTE trunked communication system, multiple departments under a client may need sharing base resource, but the equipment such as different core network, HSS, OMC of use carries out independently opening an account and the demand such as service maintenance, and this just requires that base station needs select different core net to carry out route according to the department of user.Fig. 1 is the demand schematic diagram of terminal by same base station access different core network.
Support the function of RANSHARING in existing LTE protocol, may be used for realizing the demand.Concrete processing procedure comprises: base station is shared to multiple operator (PLMN) and used Radio Resource, the core net of base station and multiple PLMN sets up independently S1 interface, the PLMNID of support is broadcasted in base station in system message, UE selects the PLMN oneself opened an account to access, and in the RRCConnectionSetupComplete message sending to base station, carry the PLMNID of the PLMN that UE selects, initial direct-sending message, according to the core net that PLMNID selects and this PLMN is corresponding, is sent to corresponding core net by S1 mouth by base station.
Based on above-mentioned RANSHARING function, configure different PLMNID can in prior art different departments, select the core net of corresponding department according to PLMNID.These departments can be referred to as virtual operator.Current agreement supports maximum 6 core net, and namely the independent department of maximum support 6 divides.
The above-mentioned processing mode based on RANSHARING function, there are the following problems:
1, maximumly can only support 6 independent department sharing base, and core net, HSS, OSS etc. are independent uses.
2, use different PLMNID, need to use to government department's application, be difficult to apply for multiple PLMNID, have very large limitation.
Summary of the invention
The application provides terminal access method in digital clustering communication system and device, and the terminal use that can realize different department is easily by different core network corresponding to shared base station access all departments.
For achieving the above object, the application adopts following technical scheme:
A terminal access method in digital clustering communication system, comprising:
During terminal access core net, the message that base station receiving terminal sends, carries virtual operator's mark that described terminal reads from own terminal mark in described message; Wherein, in terminal iidentification, the value of specific field is the virtual operator's mark for identifying each department, and HSS is for identifying the terminal iidentification arranging described terminal according to the virtual operator of terminal department when terminal is opened an account;
Described base station is according to the corresponding relation of virtual operator's mark of self preserving with core net, and the virtual operator sent according to terminal identifies, and terminal is accessed the core net that this virtual operator mark is corresponding.
Preferably, described terminal iidentification is international mobile subscriber identity (IMSI), terminal equipment number (IMEI) or cell-phone number (MSISDN).
Preferably, when described terminal iidentification is IMSI, the N position value in described IMSI from the next bit of PLMNID identified as virtual operator, N is default natural number.
Preferably, the mode of described base station acquisition virtual operator mark and core net corresponding relation comprises: the corresponding relation in advance in a base station between configuration virtual operator identifier and core net.
Preferably, described base station obtains virtual operator's mark and comprises with the mode of core net corresponding relation: set up S1 in base station and core net when being connected, virtual operator's list that described core net is supported by this core net of base station described in S1 message informing, the corresponding relation between virtual operator's mark and core net is preserved in described base station.
Preferably, when virtual operator's mark that described core net is corresponding occurs to change, core net upgrades virtual operator's identification list by MME config update flow process informing base station.
Preferably, identify corresponding core net comprise when the information that terminal sends to be transmitted to base station described time corresponding virtual operator that terminal sends by virtual operator's mark and multiple core net:
The core net set belonging to this PLMNID is selected according to the PLMNID of terminal in base station, and the subset that all core net of the virtual operator selecting terminal to send in this core net set mark correspondence are formed, in this subset, select a core net according to core net load, the information that described terminal sends is transmitted to the core net selected.
Preferably, the message that terminal sends is RRC connection setup complete message.
A communication means in digital clustering communication system, comprising:
The virtual operator's identification list for identifying each department that base station is supported to terminal broadcast self;
Terminal reads the virtual operator's identification list in broadcast, virtual operator's mark that display base station is supported, when accessing, sends virtual operator that is that user selects or default configuration mark to base station;
Described base station is according to the corresponding relation of virtual operator's mark of self preserving with core net, and the virtual operator sent according to terminal identifies, and terminal is accessed the core net that this virtual operator mark is corresponding.
Preferably, the mode of described base station acquisition virtual operator mark and core net corresponding relation comprises: the corresponding relation in advance in a base station between configuration virtual operator identifier and core net.
Preferably, described base station obtains virtual operator's mark and comprises with the mode of core net corresponding relation: when a core net is accessed in base station, virtual operator's list that described core net is supported by this core net of base station described in S1 message informing, the corresponding relation between virtual operator's mark and core net is preserved in described base station.
Preferably, when virtual operator's mark that described core net is corresponding occurs to change, core net upgrades virtual operator's identification list by MME config update flow process informing base station.
Preferably, identify corresponding core net comprise when the information that terminal sends to be transmitted to base station described time corresponding virtual operator that terminal sends by virtual operator's mark and multiple core net:
The core net set belonging to this PLMNID is selected according to the PLMNID of terminal in base station, and the subset that all core net of the virtual operator selecting terminal to send in this core net set mark correspondence are formed, in this subset, select a core net according to core net load, the information that described terminal sends is transmitted to the core net selected.
A terminal access device in digital clustering communication system, comprising: virtual operator mark receiving element, core net selected cell, access unit and memory cell;
Described memory cell, for preserving the corresponding relation of virtual operator's mark and core net;
Described virtual operator mark receiving element, for the message that receiving terminal sends, and extracts virtual operator's mark of described terminal reading from own terminal mark from described message; Wherein, in described terminal iidentification, the value of specific field is the virtual operator's mark for identifying each department, and HSS is for identifying the terminal iidentification arranging described terminal according to the virtual operator of terminal department when terminal is opened an account;
Described core net selected cell, for virtual operator's mark and the corresponding relation of core net preserved according to described memory cell, selects to identify corresponding core net with the virtual operator that terminal is sent, and notifies described access unit;
Described access unit, for accessing the core net that described core net selected cell is selected by described terminal.
A terminal access device in digital clustering communication system, comprising: virtual operator mark receiving element, core net selected cell, access unit and memory cell;
Described memory cell, for preserving the corresponding relation of virtual operator's mark and core net;
Described virtual operator mark acquiring unit, for the virtual operator's identification list for identifying each department supported to terminal broadcast self, and receives the virtual operator's mark sending user and select;
Described core net selected cell, for virtual operator's mark and the corresponding relation of core net preserved according to described memory cell, selects to identify corresponding core net with the virtual operator that terminal is sent, and notifies described access unit;
Described access unit, for accessing the core net that described core net selected cell is selected by described terminal.
As seen from the above technical solution, in the application, using the virtual operator mark of the specific field in terminal iidentification as the department of differentiation; HSS, when carrying out terminal and opening an account, arranges the terminal iidentification of terminal according to virtual operator's mark of this terminal department; Read the virtual operator's mark in own terminal mark after starting up of terminal, send RRC connection setup complete message to base station, and carry virtual operator's mark of described terminal reading; Base station is according to the corresponding relation of virtual operator's mark of self preserving with core net, and the virtual operator sent according to terminal identifies, and the information that terminal sends is transmitted to and identifies corresponding core net with this virtual operator.By the way, can realize according to the virtual operator's mark in terminal iidentification easily in a base station, by department's core net corresponding for this terminal access respective virtual operator identifier.
Accompanying drawing explanation
Fig. 1 is the demand schematic diagram of terminal by same base station access different core network;
Fig. 2 is the schematic flow sheet one of terminal access method in the application;
Fig. 3 is the schematic flow sheet of mutual virtual operator list between core net and base station;
Fig. 4 is the schematic flow sheet of virtual operator's list update;
Fig. 5 is the schematic flow sheet two of terminal access method in the application.
Embodiment
In order to make the object of the application, technological means and advantage clearly understand, below in conjunction with accompanying drawing, the application is described in further details.
Access core net corresponding to different department for realizing terminal use by base station, the application provides method one flow process shown in Fig. 2, specifically comprises:
Step 201, in terminal iidentification, select field as the virtual operator's mark for identifying each department in advance, terminal reads virtual operator's mark and preserves in own terminal mark.
Wherein, terminal iidentification can be the mark for unique identification terminal such as international mobile subscriber identity (IMSI), terminal equipment number (IMEI) or cell-phone number (MSISDN).In this terminal iidentification, selected part field identifies as virtual operator, and this virtual operator mark is for identifying different department.In terminal iidentification, specifically choose virtual operator when identifying the field taken, can select according to the function of each field in present terminal mark, such as can select in terminal iidentification, do not have specifically functional field to be used as virtual operator's mark at present, or the part figure place in the more field of reserved figure place identifies as virtual operator.
Be described for IMSI below.IMSI is stored in SIM card, can be used for the effective information distinguishing mobile subscriber.According to the definition of 3GPP agreement 23003, IMSI number has 15 decimal numbers, and every scope 0 ~ 9, its structure specifically comprises: MCC+MNC+MSIN.Wherein the implication of each field and function as follows:
MCC:MobileCountryCode, Mobile Country Code MCC, totally 3;
MNC:MobileNetworkCode, Mobile Network Code, altogether two or three-digit;
MSIN:MobileSubscriblerIdentificationNumber10 position or 9.
In public network agreement, MNC represents operator code, is distributed unitedly by supervision department, according to circumstances locates 2 or 3.Wherein, MCC+MNC is exactly aforesaid PLMNID.
In this application, the structure of amendment IMSI, for the multiple departments (virtual operator) under a client, first 2 or 3 of getting in MSIN identify (VirtualOPCode as virtual operator, VOC), be similar to MNC, be used for identifying different virtual operators.
IMSI structural modification is: MCC+MNC+VOC+MSIN, and wherein, the implication of each field and function are as given a definition:
MCC:MobileCountryCode, Mobile Country Code MCC, totally 3;
MNC:MobileNetworkCode, Mobile Network Code, altogether two or three-digit;
VOC:VirtualOPCode, virtual operator identifies, altogether two or three-digit;
MSIN:MobileSubscriblerIdentificationNumber totally 8,7 or 6.
Wherein, the figure place that MCC with MNC takies is identical with existing IMSI, two or three-digit before in existing MSIN marked off and be used as virtual operator's mark (i.e. VOC), so different according to the figure place that MNC with VOC takies, revising the figure place that MSIN takies afterwards may be 8,7 or 6.
Client as the case may be as how many in department, business demand etc. can the VOC of planning and configuration 2 or 3.Particularly, corresponding different VOC figure place divides, and the number of users in virtual operator and virtual operator is as follows:
If 1 MNC3 position, VOC3 position, so MSIN is 6, then virtual operator is maximum 1000, maximumly under each virtual operator can support 1,000,000 users;
If 2 MNC2 positions, VOC2 position, so MSIN is 8, then virtual operator is maximum 100, maximumly under each virtual operator can support 100,000,000 users;
If 3 MNC2 positions, VOC3 position, so MSIN is 7, then virtual operator is maximum 1000, maximumly under each virtual operator can support 1,000 ten thousand users;
If 4 MNC3 positions, VOC2 position, so MSIN is 7, then virtual operator is maximum 100, maximumly under each virtual operator can support 1,000 ten thousand users.
As mentioned above, network side can arrange virtual operator mark figure place be 2 or 3.In fact, when specific implementation, the figure place N that can virtual operator be selected as required to identify, can be not limited to 2 or 3, N be default natural number.When planning that virtual operator's networking is opened an account signing, fix figure place.Require under same PLMN that virtual operator identifies figure place identical.HSS is that terminal is opened an account, and during planning IMSI, needs VOC section to be set in IMSI to go.Particularly, HSS identifies the VOC field value arranged in the IMSI number of this departmental terminals according to the virtual operator of department.If PLMNID is 5, then from being set to VOC (2 or 3 decimal numbers) by the 6th of left-to-right order, if PLMNID is 6, then from being set to VOC (2 or 3 decimal numbers) by the 7th of left-to-right order.During UE start, IMSI number in reading SIM card, length according to PLMNID reads VOC, if namely PLMNID is 5, then read two or three-digit from by the 6th of left-to-right order, if PLMNID is 6, then read two or three-digit from by the 7th of left-to-right order, this two or three-digit decimal number VOC is converted to 2 systems and saves.
Certainly, to be above-mentionedly described for two or three-digit VOC in IMSI.In actual applications, according to circumstances can select the figure place of VOC, be not limited to two or three-digit, the figure place N that can virtual operator be selected as required to identify, N are default natural number.Certainly, other-end also can be selected to identify (such as MSISDN or IMEI), utilize the part field in this mark to identify as virtual operator.Concrete process is similar to the above, just repeats no more here.
Step 202, the message that base station receiving terminal sends, this message comprises the virtual operator's mark in the own terminal mark of terminal reading.
Terminal sends the message virtual operator that comprises and is designated terminal and reads in step 201 and preserve.The message sending this virtual operator mark can set as required, and existing message can be adopted to carry, or also self-defined new message can carry virtual operator's mark.Preferably, virtual operator's mark is carried by RRC connection setup complete message in the application, for this reason, virtual operator's mark newly-increased in RRCConnectionSetupComplete message in 36.331 agreements, for virtual operator's mark that terminal notification base station needs the core net of access corresponding, thus make base station can select corresponding core net according to this virtual operator mark.Being amended as follows specifically for RRCConnectionSetupComplete message:
Wherein, in VirtualOP-Code field, its figure place taken is arranged as required, for the decimal numeral VOC of above-mentioned two or three-digit, arranges here and VirtualOP-Code field is taken 10 bits, be large enough to hold the binary number that 3 decimal systems change into.
Step 203, virtual operator's mark that base station is sent according to terminal, accesses the core net that this virtual operator mark is corresponding by terminal.
Preserve virtual operator's list that each core net is supported in a base station, wherein utilize virtual operator to identify in virtual operator's list and represent each virtual operator.That is the corresponding relation of virtual operator's mark and core net is preserved in base station.This corresponding relation can be in a base station pre-configured, such as identical with the binding mode of PLMNID and core net, and correspond on a certain S1 link by virtual operator's mark, this S1 link is the link between base station and a certain core net.Or, the corresponding relation of virtual operator and core net also can be core net by S1 interfac message notification to base station.Particularly, can adopt flow process as shown in Figure 3, when initially accessing certain core net in base station, the virtual operator's list self supported is sent to base station by S1 interface message by this core net.Certainly, other flow process and message also can be utilized to send virtual operator's list to base station, and the application is not construed as limiting this.
After virtual operator's mark that base station receiving terminal is sent, according to the corresponding relation of virtual operator's mark of self preserving with core net, the core net that the virtual operator finding terminal to send mark is corresponding, accesses this core net by terminal.
Particularly, when the core net that base station selected terminal accesses, preferentially select according to PLMNID the core net set belonging to this PLMNID, in this set, Rigen selects corresponding core net according to virtual operator's mark.If (i.e. the S1 link of virtual operator's binding has multiple a corresponding multiple core net of virtual operator's mark, as MMEPOOL), this virtual operator is then selected to identify corresponding core net subclass, in this subclass, select a core net according to the actual requirements, such as, can select according to core net load the core net that load is low.
In addition, when the virtual operator of core net support changes, such as increase the virtual operator of support, then the virtual operator's list after renewal is sent to base station by S1 interface message by core net, such as, can be completed the renewal of virtual operator's list by the MME config update flow process shown in Fig. 4.
So far, the method flow shown in Fig. 2 terminates.
Fig. 5 is the schematic flow sheet of terminal access method two in the application.As shown in Figure 5, the method comprises:
Step 501, the virtual operator's identification list for identifying each department that base station is supported to terminal broadcast self.
Wherein, base station obtain core net identify with virtual operator between the mode of corresponding relation can identical with described in step 203 in Fig. 2.Here virtual operator's mark can self-defining, and usually do not adopt PLMNID, like this, can not be subject to the quantitative limitation of PLMNID number, while does not need to apply for government yet.
Step 502, terminal reads the virtual operator's identification list in base station broadcast, virtual operator's mark that display base station is supported, selects for user.
Step 503, terminal receives virtual operator's mark that user selects, and when accessing, sends virtual operator that is that user selects or default configuration mark to base station.
In this step, when terminal accesses, terminal can send virtual operator's mark that is that user selects or system default configuration to base station.Such as, if user non-selected virtual operator mark, then virtual operator's mark of default configuration can be sent.Further, terminal can be identical with the step 202 in earlier figures 2 to the process of base station transmission virtual operator mark, just repeats no more here.
Step 504, virtual operator's mark that base station is sent according to terminal, accesses the core net that this virtual operator mark is corresponding by terminal.
The process of this step is identical with the step 203 in earlier figures 2, just repeats no more here.
So far, the method flow shown in Fig. 5 terminates.
The specific implementation of the terminal access method provided in the above-mentioned the application of being.Present invention also provides terminal access device, may be used for implementing above-mentioned terminal access method.
Corresponding to the terminal access method one shown in Fig. 2, the terminal access device that the application provides comprises: virtual operator mark receiving element, core net selected cell, access unit and memory cell.
Wherein, memory cell, for preserving the corresponding relation of virtual operator's mark and core net.Virtual operator's mark receiving element, for the message that receiving terminal sends, and extracts virtual operator's mark of terminal reading from own terminal mark from this message; Wherein, in terminal iidentification, the value of specific field is the virtual operator's mark for identifying each department, and HSS is for identifying the terminal iidentification arranging described terminal according to the virtual operator of terminal department when terminal is opened an account.Core net selected cell, for virtual operator's mark and the corresponding relation of core net preserved according to memory cell, selects to identify corresponding core net with the virtual operator that terminal is sent, and notifies access unit.Access unit, for the core net selected by terminal access core net selected cell.
Corresponding to the terminal access method two shown in Fig. 5, the terminal access device that the application provides comprises: virtual operator mark receiving element, core net selected cell, access unit and memory cell.
Wherein, memory cell, for preserving the corresponding relation of virtual operator's mark and core net.Virtual operator's mark acquiring unit, for the virtual operator's identification list for identifying each department supported to terminal broadcast self, and receives the virtual operator's mark sending user and select.Core net selected cell, for virtual operator's mark and the corresponding relation of core net preserved according to memory cell, selects to identify corresponding core net with the virtual operator that terminal is sent, and notifies access unit.Access unit, for the core net selected by terminal access core net selected cell.
Above-mentioned terminal access device can be in a base station integrated, also can as independently physical entity.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (15)
1. the terminal access method in digital clustering communication system, is characterized in that, comprising:
During terminal access core net, the message that base station receiving terminal sends, carries virtual operator's mark that described terminal reads from own terminal mark in described message; Wherein, in terminal iidentification, the value of specific field is the virtual operator's mark for identifying each department, and HSS is for identifying the terminal iidentification arranging described terminal according to the virtual operator of terminal department when terminal is opened an account;
Described base station is according to the corresponding relation of virtual operator's mark of self preserving with core net, and the virtual operator sent according to terminal identifies, and terminal is accessed the core net that this virtual operator mark is corresponding.
2. method according to claim 1, is characterized in that, described terminal iidentification is international mobile subscriber identity (IMSI), terminal equipment number (IMEI) or cell-phone number (MSISDN).
3. method according to claim 2, is characterized in that, when described terminal iidentification is IMSI, the N position value in described IMSI from the next bit of PLMNID identified as virtual operator, N is default natural number.
4. method according to claim 1, is characterized in that, the mode that described base station obtains virtual operator's mark and core net corresponding relation comprises: the corresponding relation in advance in a base station between configuration virtual operator identifier and core net.
5. method according to claim 1, it is characterized in that, described base station obtains virtual operator's mark and comprises with the mode of core net corresponding relation: set up S1 in base station and core net when being connected, virtual operator's list that described core net is supported by this core net of base station described in S1 message informing, the corresponding relation between virtual operator's mark and core net is preserved in described base station.
6. method according to claim 5, is characterized in that, when virtual operator's mark that described core net is corresponding occurs to change, core net upgrades virtual operator's identification list by MME config update flow process informing base station.
7. method according to claim 1, is characterized in that, identifies corresponding core net comprise when the information that terminal sends to be transmitted to base station described time corresponding virtual operator that terminal sends by virtual operator's mark and multiple core net:
The core net set belonging to this PLMNID is selected according to the PLMNID of terminal in base station, and the subset that all core net of the virtual operator selecting terminal to send in this core net set mark correspondence are formed, in this subset, select a core net according to core net load, the information that described terminal sends is transmitted to the core net selected.
8. method according to claim 1, is characterized in that, the message that terminal sends is RRC connection setup complete message.
9. the communication means in digital clustering communication system, is characterized in that, comprising:
The virtual operator's identification list for identifying each department that base station is supported to terminal broadcast self;
Terminal reads the virtual operator's identification list in broadcast, virtual operator's mark that display base station is supported, when accessing, sends virtual operator that is that user selects or default configuration mark to base station;
Described base station is according to the corresponding relation of virtual operator's mark of self preserving with core net, and the virtual operator sent according to terminal identifies, and terminal is accessed the core net that this virtual operator mark is corresponding.
10. method according to claim 9, is characterized in that, the mode that described base station obtains virtual operator's mark and core net corresponding relation comprises: the corresponding relation in advance in a base station between configuration virtual operator identifier and core net.
11. methods according to claim 9, it is characterized in that, described base station obtains virtual operator's mark and comprises with the mode of core net corresponding relation: when a core net is accessed in base station, virtual operator's list that described core net is supported by this core net of base station described in S1 message informing, the corresponding relation between virtual operator's mark and core net is preserved in described base station.
12. methods according to claim 11, is characterized in that, when virtual operator's mark that described core net is corresponding occurs to change, core net upgrades virtual operator's identification list by MME config update flow process informing base station.
13. methods according to claim 9, is characterized in that, identify corresponding core net comprise when the information that terminal sends to be transmitted to base station described time corresponding virtual operator that terminal sends by virtual operator's mark and multiple core net:
The core net set belonging to this PLMNID is selected according to the PLMNID of terminal in base station, and the subset that all core net of the virtual operator selecting terminal to send in this core net set mark correspondence are formed, in this subset, select a core net according to core net load, the information that described terminal sends is transmitted to the core net selected.
Terminal access device in 14. 1 kinds of digital clustering communication systems, is characterized in that, comprising: virtual operator mark receiving element, core net selected cell, access unit and memory cell;
Described memory cell, for preserving the corresponding relation of virtual operator's mark and core net;
Described virtual operator mark receiving element, for the message that receiving terminal sends, and extracts virtual operator's mark of described terminal reading from own terminal mark from described message; Wherein, in described terminal iidentification, the value of specific field is the virtual operator's mark for identifying each department, and HSS is for identifying the terminal iidentification arranging described terminal according to the virtual operator of terminal department when terminal is opened an account;
Described core net selected cell, for virtual operator's mark and the corresponding relation of core net preserved according to described memory cell, selects to identify corresponding core net with the virtual operator that terminal is sent, and notifies described access unit;
Described access unit, for accessing the core net that described core net selected cell is selected by described terminal.
Terminal access device in 15. 1 kinds of digital clustering communication systems, is characterized in that, comprising: virtual operator mark receiving element, core net selected cell, access unit and memory cell;
Described memory cell, for preserving the corresponding relation of virtual operator's mark and core net;
Described virtual operator mark acquiring unit, for the virtual operator's identification list for identifying each department supported to terminal broadcast self, and receives the virtual operator's mark sending user and select;
Described core net selected cell, for virtual operator's mark and the corresponding relation of core net preserved according to described memory cell, selects to identify corresponding core net with the virtual operator that terminal is sent, and notifies described access unit;
Described access unit, for accessing the core net that described core net selected cell is selected by described terminal.
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