CN101600237A - Handoff request method and handoff request processing method - Google Patents
Handoff request method and handoff request processing method Download PDFInfo
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- CN101600237A CN101600237A CNA200810085919XA CN200810085919A CN101600237A CN 101600237 A CN101600237 A CN 101600237A CN A200810085919X A CNA200810085919X A CN A200810085919XA CN 200810085919 A CN200810085919 A CN 200810085919A CN 101600237 A CN101600237 A CN 101600237A
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Abstract
The invention discloses handoff request method and handoff request processing method, above-mentioned handoff request method comprises: source base station constructs carries the handoff request message of the closed group cell list that allows the terminal access; Source base station sends handoff request message to target BS or mobile management entity.By technique scheme, can allow the base station understand which CSG and allow terminal to insert, thereby optimize handoff procedure.
Description
Technical field
The present invention relates to the communications field, particularly, relate to handoff request method and handoff request processing method.
Background technology
Long Term Evolution (Long Term Evolution, abbreviating LTE as) network is by E-UTRAN (Evolved UTRAN, the universal land radio access web of evolution) base station (EvolvedNodeB, abbreviate eNB as) and evolution packet switching center (Evolved Packet Core, abbreviate EPC as) form network architecture flattening.
Wherein, EUTRAN comprises the set of the eNB that is connected by the S1 interface with EPC, can connect by X2 between the eNB.S1, X2 are logic interfacing.An EPC can manage one or more eNB, a NodeB also can be controlled by a plurality of EPC, and an eNB can manage one or more sub-districts, and one or several sub-districts belong to a tracking area (Tracking Area, abbreviate TA as), each sub-district can only corresponding tracking area.Also have simultaneously Home eNodeB in the LTE network, in order to satisfy the demand that the public arena covers, the cell combination of one or more Home eNodeB is defined as closed group (Closed SubscriberGroup abbreviates CSG as).
There are following relation in TA and CSG: a corresponding TA in sub-district or a CSG; CSG and TA can be overlapping on the geographic area; The a plurality of sub-districts that belong to a CSG can belong to a TA or a plurality of TA, and not necessarily continuous on the geographic area; Show it is that this sub-district is TA sub-district or CSG sub-district in the Cell Broadcast CB.Wherein, Fig. 1 shows the schematic diagram that concerns of TA and CSG.
The switching of LTE is divided into the handoff procedure of S1 interface and the handoff procedure of X2 interface.Include in the present handoff request message and switch the restriction list information, this mainly is in order to satisfy the demand of operator.
Wherein, include the TA list information that does not allow terminal to insert in the above-mentioned list information.Shown in following table 1.
Table 1
| The cell title | There is situation | Scope |
| The original Applied layer interface ID of UE | M | |
| Switch reasons | M | |
| Target cell ID | M | |
| The SAE carrying that needs to set up is tabulated | |
1 to maximum SAE carrying number |
| Switch the constraint tabulation | O | |
| …… |
For CSG, need make equally the base station knows which is to allow terminal to insert, and those are not allow terminal to insert, otherwise, terminal just may occur and switch the redundant failure phenomenon of appearance, thereby cause user satisfaction to descend.But this technology at present also is unrealized.
Summary of the invention
Consider that the needs that exist in the correlation technique allow the base station understand which CSG and allow the problem of terminal access and propose the present invention.For this reason, the present invention aims to provide a kind of handoff request method and handoff request processing method, in order to address the above problem.
According to an aspect of the present invention, provide a kind of handoff request method.
Handoff request method according to the embodiment of the invention comprises: source base station constructs carries the handoff request message of the closed group cell list that allows the terminal access; Source base station sends handoff request message to target BS or mobile management entity.
According to a further aspect in the invention, provide a kind of handoff request processing method.
Handoff request processing method according to the embodiment of the invention comprises: mobile management entity receives the handoff request message from source base station, wherein, carries the closed group cell list that allows terminal to insert in the handoff request message; Mobile management entity obtains the closed group cell list that the permission terminal in the handoff request message inserts.
In accordance with a further aspect of the present invention, provide a kind of handoff request processing method.
Handoff request processing method according to the embodiment of the invention comprises: target BS receives the handoff request message from source base station, wherein, carries the closed group cell list that allows terminal to insert in the handoff request message; Target BS obtains the closed group cell list that the permission terminal in the handoff request message inserts.
By technique scheme of the present invention,, can allow the base station understand which CSG and allow terminal to insert, thereby optimize handoff procedure than prior art.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that concerns according to the TA of correlation technique and CSG;
Fig. 2 is the flow chart according to the handoff request method of the inventive method embodiment one;
Fig. 3 is the flow chart according to the handoff request processing method of the inventive method embodiment one;
Fig. 4 is the Signalling exchange flow chart according to the handoff request processing method of the embodiment of the invention;
Fig. 5 is the flow chart according to the handoff request processing method of the inventive method embodiment two;
During Fig. 6 according to the Signalling exchange flow chart of the handoff request processing method of the inventive method embodiment three.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
As mentioned above, in handoff procedure, need make the reception main body of handoff request know that those CSG allow terminal to insert, which CSG does not allow terminal to insert.For this reason, the embodiment of the invention increases the CSG relevant information in handoff request message.But, in the mixed networking environment, comprise a large amount of base station from home (Home NodeB abbreviates HNB as), for base station from home, the maximum number that defines HNB at present is 2
28, so the quantity of CSG is very huge, that is to say, it is unpractiaca adopting the CSG that forbids to come about beamsplitter terminal switching, therefore, in embodiments of the present invention, carries the closed group list information of permission in handoff request information.
Method embodiment one
According to the embodiment of the invention, a kind of handoff request method at first is provided, this method expands handoff request message, makes it comprise the CSG list information that allows access.Fig. 2 has provided the handling process of this method, as shown in Figure 2, comprises following processing:
Step S202, source base station constructs carries the handoff request message of the CSG cell list that allows the terminal access; Wherein, comprise the CSG sign in the CSG cell list;
Step S204, source base station sends above-mentioned handoff request message to target BS or MME.Particularly, source base station sends S1 interface handoff request message by the S1 interface to MME, sends X2 interface handoff request message by X2 interface to target BS.
Wherein, construct above-mentioned handoff request message and can realize by dual mode, the one, expand handoff request message, increase CSG tabulation IE, shown in following table 2; The 2nd, in the switching restriction tabulation of former handoff request message, increase CSG tabulation IE, shown in following table 3.
Table 2
| The cell title | There is situation | Scope |
| The original Applied layer interface ID of UE | M | |
| Switch reasons | M | |
| Target cell ID | M | |
| The SAE carrying that needs to set up is tabulated | |
1 to maximum SAE carrying number, is 256 to the maximum |
| Switch the constraint tabulation | O | |
| The CSG tabulation that allows | O | |
| …… |
Table 3
| The cell title | There is situation | Scope |
| Service PLMN | M | |
| Equity PLMN tabulation | 0 to maximum PLMN number, is 15 to the maximum | |
| The TA tabulation of forbidding | 0 to maximum TA number, is 16 to the maximum | |
| The LA tabulation of forbidding | 0 to maximum LA number, is 16 to the maximum | |
| The CSG tabulation that allows | 0 to maximum CSG number, and the CSG number can be according to different requirements set, and suggestion is 16 herein, but is not limited to this value. |
By above-mentioned processing, the CSG situation that can allow terminal to insert be informed base station or mobile management entity, thereby can be at the follow-up switch decision that carries out when having handoff procedure to initiate.Need to prove,, then need in handoff request, not carry this CSG tabulation if terminal does not have CSG to insert constraint.
Method embodiment two
According to the embodiment of the invention, a kind of handoff request processing method also is provided, this method is based on the S1 interface, and Fig. 3 has provided the flow chart of this method, as shown in Figure 3, comprises following processing:
Step S302, MME receives the handoff request message from source base station, wherein, carries the CSG cell list that allows terminal to insert in the handoff request message;
Step S304, MME obtain the CSG cell list that the permission terminal in the handoff request message inserts.
After MME has obtained this CSG cell list, it can be kept at this locality, use for follow-up switch decision, particularly, MME can judge that current terminal allows at which CSG to insert, and in next switch decision, just can judge whether to allow terminal to switch at Target cell, and the suitable Target cell in the CSG that selects to insert for terminal inserts, and prevents that terminal from occurring because the rights of using problem causes the phenomenon of handoff failure.Need to prove,, represent that then terminal does not have the CSG constraint if there is not the CSG cell list in the handoff request.
As can be seen, by the foregoing description, MME can utilize the CSG information of permission to select suitable switching target small area for UE, thereby realizes switch decision optimization, improves handover success rate.
Illustrate that below in conjunction with Fig. 4 using method embodiment one and method embodiment two realize the process of handover optimization, as shown in Figure 4, roughly process is as follows: source base station sends S1 interface handoff request message to MME, wherein comprises the CSG list information that allows access; MME preserves this CSG list information, is used for follow-up switch decision.
Particularly, suppose that terminal is current resident at sub-district A, sub-district A is on source base station, because sub-district B signal quality is good and base station judgement sub-district B is a switching target small area, then terminal is initiated to the S1 handoff procedure of sub-district B, source base station is initiated handoff request message by the S1 interface to MME, comprises the CSG list information of permission in this message; After sub-district B received handoff request message, according to this information updating local information, the CSG list information that preserve to allow when the follow-up initiation switching flow of terminal, can carry out switch decision according to the CSG list information of this permissions access.
Method embodiment three
According to the embodiment of the invention, a kind of handoff request processing method also is provided, this method is based on X2 interface, and Fig. 5 has provided the flow chart of this method, as shown in Figure 5, comprises following processing:
Step S502, target BS receives the handoff request message from source base station, wherein, carries the CSG cell list that allows terminal to insert in the handoff request message;
Step S504, target BS obtain the CSG cell list that the permission terminal in the handoff request message inserts.
After target BS has obtained this CSG cell list, it can be kept at this locality, use for follow-up switch decision, particularly, target BS can judge that current terminal allows at which CSG to insert, and in next switch decision, just can judge whether to allow terminal to switch at Target cell, and the Target cell in the CSG that selects to insert for terminal inserts, and prevents that terminal from occurring because the rights of using problem causes the phenomenon of handoff failure.Need to prove,, represent that then terminal does not have the CSG constraint if there is not the CSG cell list in the handoff request.
As can be seen, by the foregoing description, target BS can utilize the CSG information of permission to select suitable switching target small area for UE, thereby realizes switch decision optimization, improves handover success rate.
Illustrate that below in conjunction with Fig. 6 using method embodiment one and method embodiment three realize the process of handover optimization, as shown in Figure 6, roughly process is as follows: source base station sends X2 interface handoff request message to target BS, wherein comprises the CSG list information that allows access; Target BS is preserved this CSG list information, is used for follow-up switch decision.
Particularly, terminal is current resident on the A of sub-district, because sub-district B signal quality is good and base station judgement sub-district B is a switching target small area, terminal is initiated to the X2 handoff procedure of sub-district B, sub-district B is on target BS, source base station is initiated handoff request message by X2 interface to target BS, comprises the CSG list information of permission in this message; After sub-district B receives handoff request message, according to this information updating local information, the CSG list information that preserve to allow, in the time of the follow-up initiation switching flow of terminal, target BS can come according to the CSG list information of this permission to select suitable switching target small area to terminal.
As mentioned above,, can realize switch decision optimization, utilize the CSG information that allows to insert, can improve handover success rate for UE selects suitable switching target small area by means of technique scheme of the present invention.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a handoff request method is characterized in that, comprising:
Source base station constructs carries the handoff request message of the closed group cell list that allows the terminal access;
Described source base station sends described handoff request message to target BS or mobile management entity.
2. method according to claim 1, it is characterized in that, also comprise in the described handoff request message and switch the restriction tabulation, and the closed group cell list that described permission terminal inserts is carried in the described switching restriction tabulation, wherein, described switching restriction tabulation is not for allowing the tracking area tabulation of described terminal access.
3. a handoff request processing method is characterized in that, comprising:
Mobile management entity receives the handoff request message from source base station, wherein, carries the closed group cell list that allows terminal to insert in the described handoff request message;
Described mobile management entity obtains the closed group cell list that the described permission terminal in the described handoff request message inserts.
4. method according to claim 3 is characterized in that, further comprises:
Described mobile management entity is preserved the closed group cell list of the described permission terminal access of obtaining;
When described terminal was initiated follow-up handoff procedure, described mobile management entity carried out switch decision according to the closed group cell list that the described permission terminal of preserving inserts.
5. according to claim 3 or 4 described methods, it is characterized in that, the switching that the closed group cell list that described permission terminal inserts is carried in the described handoff request message limits in the tabulation, and wherein, described switching restriction tabulation is not for allowing the tracking area tabulation of described terminal access.
6. a handoff request processing method is characterized in that, comprising:
Target BS receives the handoff request message from source base station, wherein, carries the closed group cell list that allows terminal to insert in the described handoff request message;
Described target BS obtains the closed group cell list that the described permission terminal in the described handoff request message inserts.
7. method according to claim 6 is characterized in that, further comprises:
Described target BS is preserved the closed group cell list of the described permission terminal access of obtaining;
When described terminal was initiated follow-up handoff procedure, described target BS carried out switch decision according to the closed group cell list that the described permission terminal of preserving inserts.
8. according to claim 6 or 7 described methods, it is characterized in that, the switching that the closed group cell list that described permission terminal inserts is carried in the described handoff request message limits in the tabulation, and wherein, described switching restriction tabulation is not for allowing the tracking area tabulation of described terminal access.
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| CN104221405A (en) * | 2012-03-29 | 2014-12-17 | 三菱电机研发中心欧洲有限公司 | Trust based system and method for performing a handover from a source base station to a target base station |
| CN104221405B (en) * | 2012-03-29 | 2018-10-12 | 三菱电机研发中心欧洲有限公司 | Execute the system and method based on trust of the switching from source base station to target BS |
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