CN103702393A - CSFB (Circuit Switched Fallback) network switching method, MME (Mobile Management Entity) and base station - Google Patents
CSFB (Circuit Switched Fallback) network switching method, MME (Mobile Management Entity) and base station Download PDFInfo
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Abstract
The invention provides a CSFB (Circuit Switched Fallback) network switching method, an MME (Mobile Management Entity) and a base station. The method comprises the steps that the MME receives a searching result transmitted by the base station, wherein the searching result is obtained by searching 3G (3-Generation) or 2G (2-Generation) cells in a switching process executed by a terminal in an LTE (Long Term Evolution) network; the MME transmits request information of obtaining a terminal state to the base station; the MME receives the terminal state information transmitted by the base station, wherein the state information indicates whether the terminal has a PS (Packet Switched) service or not; the MME selects one or a plurality of 3G or 2G cells which are matched with the service of the terminal from the searching result and stores the 3G or 2G cells in the form of a list; if the terminal needs to perform CSFB, the MME selects a destination 3G or 2G cell from the list, transmits a CSFB command to the base station and transmits the information of the selected destination 3G or 2G cell to the base station to enable the base station to switch the terminal to the selected destination 3G or 2G network cell.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to a kind of CSFB method for switching network, mobile management entity and base station.
Background technology
LTE is the evolution of 3G technology, be 3G to a transitional technology between 4G technology, LTE network is one and has high digit rate, low time delay, supports multiple access technology, the mobile communications network based on full packetizing.And CSFB is a kind of voice solution at LTE network Development initial stage, it is a kind of cambic voice solution that most operators are selected, the terminal with LTE ability, cannot transmission circuit territory service signal in LTE network, in order to make terminal, under LTE access, can initiate the CS business such as speech, and the paging that receives the CS business such as speech, and can correctly process terminal ongoing PS business in LTE network, produced CSFB technology.
The process of general CSFB is that the terminal of carrying out PS business resides in LTE network, and when need initiating or receiving CS business, terminal need to fall back to 3G or 2G network, and terminal is carried out the search of 3G or 2G Target cell, selects the Target cell that meets CS professional qualification to switch.If the network after falling after rise can meet PS business demand, realize PS business in company with switching, have else if ongoing PS business to carry out pending operation, until CS business executes, terminal comes back to LTE network, and now terminal can continue to carry out PS business.
Under this switching mode, whenever terminal need to be initiated CS business and carry out CSFB while falling after rise, terminal need to re-start measurement, comprise search 3G or 2G Target cell, obtain target cell information, the steps such as judgement Target cell load condition, the access delay that CSFB is fallen after rise is larger, affects user and experiences.
Summary of the invention
The invention provides a kind of CSFB method for switching network, mobile management entity and base station, for carry out accelerating to fall after rise speed improvement user when CSFB network switches in terminal, experience.
One aspect of the present invention provides a kind of CSFB method for switching network, comprising:
Mobile management entity MME receives the Search Results that base station sends, and in the handoff procedure that described Search Results is carried out in Long Term Evolution LTE network by described terminal, 3G or 2G cell search is obtained;
Described MME sends and obtains SOT state of termination request message to described base station;
Described MME receives the state information of the described terminal of described base station transmission, and described state information represents whether described terminal has the data PS business of carrying out;
Described MME selects the business of one or more and described terminal to match from described Search Results 3G or 2G cell according to described state information, and store with tabular form;
If described terminal need to be carried out circuit domain dropping, described MME is select target 3G or 2G cell in described list, to described base station, send CSFB and fall instruction after rise, and the information of selected target 3G or 2G cell is sent to described base station, so that described base station switches to described terminal target 3G or the 2G network cell of described selection.
The present invention provides a kind of circuit domain dropping CSFB method for switching network on the other hand, comprising:
The Search Results that base station receiving terminal sends, obtains 3G or 2G cell search in the handoff procedure that described Search Results is carried out in Long Term Evolution LTE network by described terminal;
Described base station sends to mobile management entity MME by described Search Results;
Described base station receives that described MME sends obtains SOT state of termination request message;
Described base station sends the state information of described terminal to described MME, described state information represents whether described terminal has the data PS business of carrying out;
Described base station receives the information of the selected target 3G of described MME or 2G cell, the selected target 3G of described MME or 2G cell target 3G or 2G cell that to be described MME select in the community that the business of the one or more and described terminal of selecting from described Search Results according to described state information matches;
Described base station receives the CSFB falling instruction that described MME sends, and described terminal is switched to target 3G or the 2G network cell of described selection according to described CSFB falling instruction.
Another aspect of the invention provides a kind of mobile management entity, comprising:
Receiver module, the Search Results sending for receiving base station, obtains 3G or 2G cell search in the handoff procedure that described Search Results is carried out in Long Term Evolution LTE network by terminal;
Sending module, for sending and obtain SOT state of termination request message to described base station;
Described receiver module is also for receiving the state information of the described terminal of described base station transmission, and described state information represents whether described terminal has the data PS business of carrying out;
Select module, for 3G or the 2G cell of selecting the business of one or more and described terminal to match from described Search Results according to described state information;
Memory module, stores with tabular form for 3G or 2G cell that the business of the one or more and described terminal of described selection is matched;
Described selection module is also at described list select target 3G or 2G cell;
Described sending module also falls instruction after rise for sending CSFB to described base station, and the information of selected target 3G or 2G cell is sent to described base station, so that described base station switches to described terminal target 3G or the 2G network cell of described selection.
Another aspect of the invention provides a kind of base station, comprising:
Receiver module, the Search Results sending for receiving terminal, obtains 3G or 2G cell search in the handoff procedure that described Search Results is carried out in Long Term Evolution LTE network by described terminal;
Sending module, for sending to mobile management entity MME by described Search Results;
Described receiver module also obtains SOT state of termination request message for what receive that described MME sends;
Described sending module is also for sending the state information of described terminal to described MME, described state information represents whether described terminal has the data PS business of carrying out;
Described receiver module is further used for receiving the CSFB falling instruction that described MME sends, and receive the information of the selected target 3G of described MME or 2G cell, the selected target 3G of described MME or 2G cell target 3G or 2G cell that to be described MME select in the community that the business of the one or more and described terminal of selecting according to described state information matches from described Search Results;
Handover module, switches to described terminal target 3G or the 2G network cell of described selection for falling instruction after rise according to described CSFB.
The present invention is by above-mentioned CSFB method for switching network, mobile management entity and base station, terminal is searched for 3G or 2G and is retained Search Results in LTE network switches, when the terminal in LTE network need to be carried out CS business and carry out CSFB while falling after rise, select 3G or the 2G cell with PS professional ability and CS professional ability to switch simultaneously, accelerate CSFB and fallen speed after rise, thereby improved user's experience.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of CSFB method for switching network one embodiment of the present invention;
Fig. 2 is the schematic diagram of another embodiment of CSFB method for switching network of the present invention;
Fig. 3 is that the CSFB of terminal of the present invention while residing in LTE network falls flow chart after rise;
Fig. 4 is the structure chart of mobile management entity MME of the present invention;
Fig. 5 is the structure chart of base station eNodeB of the present invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the schematic diagram of CSFB method for switching network one embodiment of the present invention, and as shown in Figure 1, the method can comprise:
101, mobile management entity MME receives the Search Results that base station sends, and in the handoff procedure that Search Results is carried out in Long Term Evolution LTE network by terminal, 3G or 2G cell search is obtained;
In LTE network, if because signal is not good or while causing meeting the business demand of terminal in movement due to terminal, need to carry out network switching, terminal can be searched for LTE network cell.Because terminal is not carried out voice CS business, therefore generally, terminal can not retain the Search Results of 3G or 2G cell when carrying out web search.In the present invention, terminal retains LTE web search results when carrying out web search, also retain the Search Results of 3G or 2G cell, and the Search Results of 3G or 2G cell is sent to base station eNodeB, base station eNodeB is sent to mobile management entity MME by Search Results simultaneously.
In Search Results, comprise the 3G that searches or the cell information of 2G cell, cell information can comprise: subdistrict frequency point information, CS business load state information, PS professional ability information etc.
102, MME sends and obtains SOT state of termination request message to base station;
103, MME receives the state information of the terminal of base station transmission, and state information represents whether terminal has the PS business of carrying out;
MME, after receiving the Search Results of terminal, can send out request message to base station, to obtain the state information of this terminal.Now, terminal resides in LTE network, if terminal executing data PS business not, to return to the state information of terminal be that PS business Idle state is to MME in base station, if terminal is being carried out PS business, to return to the state information of terminal be that PS service connection state is to MME in base station.
104, MME selects one or more 3G or 2G cells that match with business terminal from Search Results according to state information, and stores with tabular form;
MME receives the PS service connected state of the terminal that base station sends, and according to the 3G in the PS service connected state of terminal and Search Results or the cell information of 2G cell, the Target cell of selecting one or more conducts to mate with terminal in the Search Results of aforementioned 3G or 2G cell, cell information comprises: subdistrict frequency point information, PS professional ability information, CS business load state information etc., and this system of selection is specially:
If terminal is in PS business idle condition, MME can select the one or more CS of having professional abilities in to the Search Results of 3G or 2G cell, and the relatively low community of CS business load is as the Target cell of mating with this terminal, and these Target cells are stored with tabular form.This Target cell list re-starts search and upgrades in the time of may once switching on LTE is internetwork due to terminal.
If terminal is in PS service connected state, MME can select the one or more CS of having professional abilities in the Search Results of 3G or 2G cell, and the community that CS business load is relatively low, the community preferably with PS professional ability, as the Target cell of mating with this terminal, and these Target cells are stored with tabular form.If the 3G in Search Results or 2G cell can not meet the PS business demand of terminal, MME only considers the CS business load state of 3G or 2G cell, preferentially guarantees the smooth execution of CS business.Same, this Target cell list re-starts search and upgrades in the time of may once switching on LTE is internetwork due to terminal.
If 105 terminals need to be carried out circuit domain dropping, MME is select target 3G or 2G cell in list, to described base station, send CSFB and fall instruction after rise, and the information of selected target 3G or 2G cell is sent to base station, so that base station switches to terminal target 3G or the 2G network cell of selection;
When residing in, the terminal of LTE network is initiated voice caller or when called, MME sends CSFB and falls instruction after rise to base station, now:
If the state of terminal is PS business Idle state, MME selects an optimal objective community in up-to-date up to now Target cell list, be that Target cell that CS business load is minimum is as the Target cell of mating with terminal, and the cell information of this Target cell is sent to eNodeB, cell information can comprise: subdistrict frequency point information, CS business load state information etc., so that eNodeB, after receiving the cell information of above-mentioned Target cell, can directly switch to terminal this Target cell;
If the state of terminal is PS service connection state, MME selects an optimal objective community in up-to-date up to now Target cell list, be that CS business load is minimum, and there is the Target cell of PS professional ability as the Target cell of mating with terminal, and the cell information of this Target cell is sent to eNodeB, cell information can comprise: subdistrict frequency point information, CS business load state information, PS professional ability information etc., so that eNodeB is after receiving the cell information of above-mentioned Target cell, can directly terminal be switched to this Target cell, the original PS business of this terminal can be proceeded at the target 3G being switched to or 2G cell so, realize PS business and CS business in company with switching.
The CSFB method for switching network that the present embodiment provides, the result of while switching between LTE network by MME receiving terminal, 3G or 2G Target cell being searched for, and in Search Results, select 3G that CS business load is minimum or 2G Target cell or select CS business load minimum and there is 3G or the 2G Target cell of PS professional ability simultaneously according to the state information of terminal, the target cell information of selection is sent to eNodeB, the terminal in LTE network makes when need to be carried out CSFB falling, base station can directly switch to terminal this 3G or 2G Target cell, and need to when carrying out CSFB falling, again not search for, accelerated falling speed, and can be so that the PS business of terminal be suspended, improved user's experience.
Fig. 2 is the schematic diagram of another embodiment of CSFB method for switching network of the present invention, and as shown in Figure 2, the method can comprise:
201, the Search Results that base station receiving terminal sends, obtains 3G or 2G cell search in the handoff procedure that Search Results is carried out in Long Term Evolution LTE network by terminal;
Base station eNodeB is chosen 3G that signal quality is good or 2G cell as alternative target cells in the Search Results of the terminal receiving, and alternative target cells according to signal strength signal intensity, carry out from large to small priority arrangement, the system of selection of alternative target cells is specially:
Base station sets one signal threshold value, is more than or equal to the 3G of this signal threshold value or 2G cell as alternative target cells using signal strength signal intensity.
202, base station sends to mobile management entity MME by Search Results;
Base station is according to the priority arrangement of alternative target cells, and ranking is forward, and the cell information of the relatively large a plurality of alternative target cells of signal strength signal intensity is sent to MME.
203, base station receives that MME sends obtains SOT state of termination request message;
204, base station is to the state information of MME transmitting terminal, and state information represents whether terminal has PS business;
Base station receives that MME obtains after SOT state of termination request message, can obtain the PS service connected state of terminal, and now terminal resides in LTE network, if terminal executing data PS business not, base station is that PS business Idle state is back to MME by the state information of terminal; If terminal is just in executing data PS business, base station meeting measuring terminals PS business resource requirement, and be that PS service connection state is back to MME by the state information of terminal, and return to terminal PS business resource requirement to MME simultaneously, so that MME is according to the state of terminal and PS business resource requirement, in alternative 3G or 2G Target cell, select optimum Target cell as the Target cell matching with terminal traffic.
205, base station receives the information of the selected target 3G of MME or 2G cell, the selected target 3G of MME or 2G cell target 3G or 2G cell that to be MME select in the community that the business of the one or more and terminal of selecting from Search Results according to state information matches;
Base station receives the optimal objective community that MME selects in one or more communities of mating with terminal traffic of selecting according to SOT state of termination, if wherein terminal is PS business idle condition, this Target cell is for having CS professional ability, and the minimum community of CS business load degree; If terminal is PS service connected state, this Target cell is for having CS professional ability, and CS business load degree is minimum, and PS business can meet the Target cell of terminal requirements, that is, the idle PS service resources of Target cell is more than or equal to the current PS business of terminal resource requirement.
206, base station receives the CSFB falling instruction that MME sends, and terminal is switched to target 3G or the 2G network cell of selection according to CSFB falling instruction.
The CSFB switching command that base station sends according to MME, is directly switch into by terminal 3G or the 2G Target cell that MME selects.After switching, terminal can start to carry out CS business, and can continue to carry out original PS business, thus complete PS business and CS business in company with switching.
The CSFB method for switching network that the present embodiment provides, by base station receiving terminal, send between LTE network, switch time result that 3G or 2G Target cell are searched for, and after being arranged, this Search Results is sent to MME, and by the state information of terminal, PS business resource requirement information when especially terminal is PS service connection state is sent to MME, so that MME carries out the selection of 3G or 2G Target cell according to the different state information of terminal, at the CSFB that receives MME, fall after rise after instruction, directly terminal is switched to the selected 3G of MME or 2G Target cell, and need to when carrying out CSFB falling, again not search for, accelerated falling speed, and can be so that the PS business of terminal be suspended, improved user's experience.
Fig. 3 is that the CSFB of terminal of the present invention while residing in LTE network falls flow chart after rise, and as shown in Figure 3, this flow process has comprised the reciprocal process between terminal, base station eNodeB and mobile management entity MME.Particularly:
Terminal, in LTE network, when network condition can not meet the demand of terminal, need to be carried out network switching;
301, base station eNodeB is controlled to terminal UE sending measuring;
302, terminal is carried out LTE cell measurement, records 3G/2G cell information simultaneously;
Terminal receives measurement that base station issues control after, start to carry out the measurement of LTE network cell, retain the measurement result to 3G or 2G cell, and record the cell information of 3G or 2G cell;
303, terminal to report measurement report is to base station;
Terminal is sent to base station by the cell information of the 3G recording or 2G cell with the form of measurement report;
304, base station is sent to mobile management entity MME by the 3G/2G cell information of terminal to report
Base station receives after the 3G or 2G cell information of terminal transmission, and this 3G or 2G cell information are arranged and arrangement result is sent to MME; Particularly:
Base station is greater than the 3G of a predetermined threshold value or 2G cell as alternative target cells using signal strength signal intensity, and carry out from large to small priority arrangement according to signal strength signal intensity, to be positioned at prostatitis, relatively large one or more alternative target cells and the cell information of signal strength signal intensity is sent to MME.
305, MME sends and obtains terminal current business status command to base station;
MME receives behind the alternative target cells and cell information of base station transmission, to base station, sends and obtains the instruction of terminal current business state information; 306, base station responds to MME transmitting terminal current state;
Terminal is after receiving the instruction of obtaining terminal traffic state information of MME transmission, and the connection status of obtaining terminal current data PS business is PS business Idle state or PS service connection state, and this connection status is back to MME; Particularly:
If terminal is PS business Idle state, base station is back to MME by SOT state of termination;
If terminal is PS service connection state, base station obtains the downstream rate value of terminal PS business, and this downstream rate value is sent to MME as terminal PS business resource requirement together with terminal's status information.
307, MME issues to base station and obtains the instruction of 3G/2G Zone ability;
308, the related service ability information request of target 3G/2G community is obtained in landwards wireless access network (UMTS Terrestrial Radio Access Network, UTRAN) transmission of base station;
309, UTRAN returns to target 3G/2G community related service capabilities response to base station;
310, base station is sent to MME by target 3G/2G Zone ability information;
Base station is sent to MME by the alternative 3G getting or the professional ability information of 2G cell, and the professional ability information of this 3G or 2G cell can comprise subdistrict frequency point information, CS business load state information, PS professional ability information of alternative cell etc.
311, MME forms list by the storage of target 3G/2G cell information, and real-time update;
MME receives after the alternative 3G of base station transmission or the professional ability information of 2G cell, according to the cell information select target community of the business state information of terminal and this alternative 3G or 2G Target cell; Particularly:
MME is according to terminal PS business state information, in alternative 3G or 2G cell, choose the one or more Target cells that match with terminal traffic and store into tabular form, and search for real-time update according to terminal next time, wherein the system of selection of MME, as embodiment before, repeats no more herein.
When 312, MME receives the audio call CS business of this terminal, choose optimal objective community;
When terminal has CS caller or when called, MME chooses the optimal objective community matching with terminal traffic in the list of Target cell;
313, MME sends CSFB falling instruction to base station, and the cell information of optimal objective 3G/2G community is sent to base station.
314, base station falls terminal to this Target cell after rise;
Base station is directly switch into this optimal objective community according to the cell information of the indication information of MME and the optimal objective community of receiving by terminal.
The present embodiment has been set forth the reciprocal process between terminal, mobile management entity MME and base station eNodeB when CSFB network switches, and wherein the specific implementation of each step, refers to the description of method shown in corresponding diagram 1 and Fig. 2 embodiment, does not repeat them here.
Fig. 4 is the structure chart of mobile management entity MME of the present invention, and as shown in Figure 4, this MME can comprise:
Sending module 42, for sending and obtain SOT state of termination request message to base station;
Sending module 42 also falls instruction after rise for send CSFB to base station, and the information of selected target 3G or 2G cell is sent to base station, so that base station switches to terminal 3G or the 2G network cell of selection
Mobile management entity MME in the present embodiment is the actuating equipment of CSFB method for switching network, and its detailed process of carrying out CSFB method for switching network can, referring to the associated description in embodiment of the method shown in Fig. 1 of the present invention, 3, not repeat them here.
The mobile management entity MME that the present embodiment provides, the result of while switching between LTE network by receiving terminal, 3G or 2G Target cell being searched for, and in Search Results, select 3G that CS business load is minimum or 2G Target cell or select CS business load minimum and there is 3G or the 2G Target cell of PS professional ability simultaneously according to the state information of terminal, the target cell information of selection is sent to base station eNodeB, the terminal in LTE network makes when need to be carried out CSFB falling, base station can directly switch to terminal this 3G or 2G Target cell, and need to when carrying out CSFB falling, again not search for, accelerated falling speed, and can be so that the PS business of terminal be suspended, improved user's experience.
Fig. 5 is the structure chart of invention base station eNodeB, and as shown in Figure 5, this base station can comprise:
Sending module 52, for sending to mobile management entity MME by Search Results;
Sending module 52 is also for the state information to MME transmitting terminal, and state information represents whether terminal has PS business;
Base station eNodeB in the present embodiment is the actuating equipment of CSFB method for switching network, and its detailed process of carrying out CSFB method for switching network can, referring to the associated description in embodiment of the method shown in Fig. 2 of the present invention, 3, not repeat them here.
The base station eNodeB that the present embodiment provides, by receiving terminal, send between LTE network, switch time result that 3G or 2G Target cell are searched for, and after being arranged, this Search Results is sent to MME, and by the state information of terminal, PS business resource requirement information when especially terminal is PS service connection state is sent to MME, so that MME carries out the selection of 3G or 2G Target cell according to the different state information of terminal, at the CSFB that receives MME, fall after rise after instruction, directly terminal is switched to the selected 3G of MME or 2G Target cell, and need to when carrying out CSFB falling, again not search for, accelerated falling speed, and can be so that the PS business of terminal be suspended, improved user's experience.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of program command.Aforesaid program can be stored in a computer read/write memory medium.This program, when carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a circuit domain dropping CSFB method for switching network, is characterized in that, comprising:
Mobile management entity MME receives the Search Results that base station sends, and in the handoff procedure that described Search Results is carried out in Long Term Evolution LTE network by described terminal, 3G or 2G cell search is obtained;
Described MME sends and obtains SOT state of termination request message to described base station;
Described MME receives the state information of the described terminal of described base station transmission, and described state information represents whether described terminal has the data PS business of carrying out;
Described MME selects the business of one or more and described terminal to match from described Search Results 3G or 2G cell according to described state information, and store with tabular form;
If described terminal need to be carried out circuit domain CSFB falling, described MME is select target 3G or 2G cell in described list, to described base station, send CSFB and fall instruction after rise, and the information of selected target 3G or 2G cell is sent to described base station, so that described base station switches to described terminal target 3G or the 2G network cell of described selection.
2. method according to claim 1, is characterized in that, if described state information represents described terminal, has the PS business of carrying out, and the selected 3G of described MME or 2G cell are the community with PS professional ability.
3. method according to claim 1 and 2, is characterized in that, described MME selects the business of one or more and described terminal to match from described Search Results 3G or 2G cell according to described state information, be specially:
If described state information represents described terminal and have the PS business of carrying out, described MME selects the community that the one or more PS of having professional abilities and CS business load Di community match as the business with described terminal in described Search Results;
If described state information represents the PS business that described terminal is not being carried out, described MME selects the community that one or more CS business load Di community matches as the business with described terminal in described Search Results.
4. a circuit domain dropping CSFB method for switching network, is characterized in that, comprising:
The Search Results that base station receiving terminal sends, obtains 3G or 2G cell search in the handoff procedure that described Search Results is carried out in Long Term Evolution LTE network by described terminal;
Described base station sends to mobile management entity MME by described Search Results;
Described base station receives that described MME sends obtains SOT state of termination request message;
Described base station sends the state information of described terminal to described MME, described state information represents whether described terminal has the data PS business of carrying out;
Described base station receives the information of the selected target 3G of described MME or 2G cell, the selected target 3G of described MME or 2G cell target 3G or 2G cell that to be described MME select in the community that the business of the one or more and described terminal of selecting from described Search Results according to described state information matches;
Described base station receives the CSFB falling instruction that described MME sends, and described terminal is switched to target 3G or the 2G network cell of described selection according to described CSFB falling instruction.
5. method according to claim 4, is characterized in that, if having if described state information represents described terminal the PS business of carrying out, the selected target 3G of described MME or 2G cell that described base station receives are the community with PS professional ability.
6. a mobile management entity, is characterized in that, comprising:
Receiver module, the Search Results sending for receiving base station, obtains 3G or 2G cell search in the handoff procedure that described Search Results is carried out in Long Term Evolution LTE network by terminal;
Sending module, for sending and obtain SOT state of termination request message to described base station;
Described receiver module is also for receiving the state information of the described terminal of described base station transmission, and described state information represents whether described terminal has the data PS business of carrying out;
Select module, for 3G or the 2G cell of selecting the business of one or more and described terminal to match from described Search Results according to described state information;
Memory module, stores with tabular form for 3G or 2G cell that the business of the one or more and described terminal of described selection is matched;
Described selection module is also at described list select target 3G or 2G cell;
Described sending module also falls instruction after rise for sending CSFB to described base station, and the information of selected target 3G or 2G cell is sent to described base station, so that described base station switches to described terminal target 3G or the 2G network cell of described selection.
7. mobile management entity according to claim 6, is characterized in that,
If the state information of the described terminal that the described base station that described receiver module receives sends represents that described terminal has the PS business of carrying out, 3G or 2G cell that described selection module is selected are the community with PS professional ability.
8. according to the mobile management entity described in claim 6 or 7, it is characterized in that, described selection module selects the business of one or more and described terminal to match from described Search Results 3G or 2G cell according to described state information are specially:
If the state information of the described terminal that the described base station that described receiver module receives sends represents that described terminal has the PS business of carrying out, described selection module is selected the community that the one or more PS of having professional abilities and CS business load Di community match as the business with described terminal in described Search Results;
If the state information of the described terminal that the described base station that described receiver module receives sends represents the PS business that described terminal is not being carried out, described selection module is selected the community that one or more CS business load Di community matches as the business with described terminal in described Search Results.
9. a base station, is characterized in that, comprising:
Receiver module, the Search Results sending for receiving terminal, obtains 3G or 2G cell search in the handoff procedure that described Search Results is carried out in Long Term Evolution LTE network by described terminal;
Sending module, for sending to mobile management entity MME by described Search Results;
Described receiver module also obtains SOT state of termination request message for what receive that described MME sends;
Described sending module is also for sending the state information of described terminal to described MME, described state information represents whether described terminal has the data PS business of carrying out;
Described receiver module is further used for receiving the CSFB falling instruction that described MME sends, and receive the information of the selected target 3G of described MME or 2G cell, the selected target 3G of described MME or 2G cell target 3G or 2G cell that to be described MME select in the community that the business of the one or more and described terminal of selecting according to described state information matches from described Search Results;
Handover module, switches to described terminal target 3G or the 2G network cell of described selection for falling instruction after rise according to described CSFB.
10. base station according to claim 9, is characterized in that, if the described state information that described sending module sends represents that described terminal has the PS business of carrying out, the selected target 3G of described MME or 2G cell are the community with PS professional ability.
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