CN101400143A - Redirecting method, system and apparatus for UE - Google Patents
Redirecting method, system and apparatus for UE Download PDFInfo
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- CN101400143A CN101400143A CNA2007101545725A CN200710154572A CN101400143A CN 101400143 A CN101400143 A CN 101400143A CN A2007101545725 A CNA2007101545725 A CN A2007101545725A CN 200710154572 A CN200710154572 A CN 200710154572A CN 101400143 A CN101400143 A CN 101400143A
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Abstract
The invention discloses a redirection method of UE, comprising: a base station receives RRC connecting request of user equipment UE; ENB requires ability information of UE to mobile management entity MME; ENB judges redirection district aggregate according to the ability information of UE received by MME, and sends down to UE. An embodiment of the invention causes ENB to know about the ability information of current UE through message alternation between ENB and MME, thereby correctly determining redirection district for UE, ensuring successful execution of redirection flow.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to reorientation method, system and the device of a kind of UE.
Background technology
At Wimax (Worldwide Interoperability for Microwave Access, micro-wave access global inter communication) the data rate index of system uplink 50M, descending 100M such as, in order to guarantee the competitiveness of 10 years wireless technologys from now on, 3GPP (third generation partner plan) normal structure has been released new generation network evolution items SAE (System Architecture Evolution, the 3GPP System Architecture Evolution)/LTE (LongTerm Evolution, Long Term Evolution) network evolution.SAE/LTE network evolution items is based on HSDPA (High Speed Downlink Packages Access, high speed downlink packet inserts) thinking of the optimization of network performance that come down in a continuous line since the technology, at original HSDPA and EUL (Enhanced Uplink, enhanced uplink) etc. on the system-based to postponing, the user data digit rate, power system capacity/covering, the carrying out of four aspects such as cost further optimized.
As shown in Figure 1, be the network architecture diagram of SAE/LTE evolution system in the prior art.Wherein, the Access Network part E-UTRAN of SAE/LTE evolution system (Evolved UMTS Territorial RadioAccess Network, the UMTS Terrestrial radio access network of evolution) forms by base station ENB (eNodeB), bottom adopts the IP transmission between the ENB, logically is connected to each other by X2 interface.Such network configuration design is mainly used in and supports the mobility of UE in whole network, guarantees user's seamless switching.ENB is responsible for (the User Equipment to UE, subscriber equipment) provides the user-plane function of evolution wave point, as PDCP (packet data convergence protocol), RLC (Radio Link Control, Radio Link control), MAC (Radio Resource Control, and the control plane function radio resource control) and PHY (Physical-Layer, physical layer),, as RRC (Radio ResourceControl, radio resource control).Evolution core net EPC links to each other with ENB by the S1 interface; The S1 interface is supported ENB and MME (Mobility Management Entity, mobile management entity)/ multi-to-multi between SAEGATEWAY (3GPP System Architecture Evolution gateway) connects, so the core net of evolution system part is made up of MME and SAE GATEWAY two parts.MME is the control plane node of evolution system core net, bears the management function of UE context and user plane carrying; SAE Gateway is the user plane node of evolution system core net, bears user data transport function.As shown in Figure 2, be prior art E-UTRAN network structure.
As shown in Figure 3, set up flow chart for the prior art initial context.In the LTE of prior art evolution system, in order to save the Radio Resource of eating dishes without rice or wine, reduce the time that RRC connect to set up simultaneously, UE is connected with RRC between ENB and does not report the self radio access capability in the process of foundation.In the LTE evolution system, the UE wireless access capability what report employing is that UE is sent to core network element MME by the Non-Access Stratum signaling when initially adhering to.MME then sets up in the process in follow-up business and sets up flow process by initial context, and the relevant ability of UE is handed down to ENB, and the reference information of resource allocation is provided.As shown in the figure, may further comprise the steps:
Step S301, MME, ENB sends beep-page message to UE.
Step S302, UE send arbitrary access front signal to ENB after the paging request of receiving network side transmitted, trigger random access procedure.
Step S303, ENB send accidental access response to UE after the request of access at random of receiving UE, the access request of UE is accepted in expression
Step S304, UE sends the RRC connection request to ENB, request ENB set up with UE between RRC be connected.Also carry the Non-Access Stratum business request information in this message, the purpose of indicating this RRC connection request is in order to set up new service conversation.
After step S305, ENB receive the RRC connection request, send initial UE message to MME.Carry the business request information that sends by UE in this message, set up flow process in order to notice MME triggering business.
Step S306, ENB send to UE simultaneously and connect resolution message, and the RRC connection request of its transmission of indication UE is received.
Step S307, MME sends initial context to ENB and sets up request, initiates the flow process of setting up of wireless side carrying.
Step S308, ENB sends radio bearer to UE and sets up message, and request UE sets up the radio bearer of user's face.
Step S309, UE send radio bearer foundation to ENB and finish message after setting up the intact self radio carrying of message arrangement according to radio bearer, and the resource allocation of indication wireless side is finished.
Step S310, ENB set up to MME feedback initial context and finish message.
In realizing embodiment of the invention process, the inventor finds that there are the following problems at least in the prior art: in prior LTE system, because the LTE standard of current formulation, the information such as ability that RRC connection request message can't be carried UE, so ENB can't obtain the ability information of this UE when request is set up.Therefore work as ENB because the restriction of the current dynamic condition of VCC ability and adjacent area of the load state of self or terminal and adjacent area can't be accepted UE to be inserted, and the RRC of refusal UE connects, and it is redirected to suitable adjacent area.This moment is because ENB can't obtain the ability information of this UE, so ENB can't select its adjacent area accurately according to the ability of this UE when receiving the RRC connection request.ENB as the LTE sub-district inserts because self overload can't be accepted UE, and this UE is redirected to designated cell, yet this UE but can't reselect to designated cell because of effects limit such as self-ability and user signing contract information, therefore this UE can only gravity treatment go back to current LTE sub-district, lay equal stress on and newly initiate the RRC connection request, cause further increasing the weight of of this ENB load.
Summary of the invention
The problem that the embodiment of the invention will solve provides reorientation method, system and the device of a kind of UE, and ENB can't accurately carry out the defective that the adjacent area is selected to described UE in the solution prior art when receiving the RRC connection request of UE.
For achieving the above object, the embodiment of the invention proposes the reorientation method of a kind of UE on the one hand, may further comprise the steps: ENB receives the RRC connection request of user equipment (UE); Described ENB is to the ability information of the described UE of mobile management entity MME request; Described ENB adjudicates the redirected cell set of described UE according to the ability information of the described UE that receives from described MME, and is handed down to described UE.
On the other hand, the embodiment of the invention also provides the Redirectional system of a kind of UE, comprises ENB, UE and MME, and described UE is used for sending the RRC connection request to described ENB, and receives the redirected cell set that described ENB returns; Described ENB, be used for after receiving the RRC connection request of described UE, ask the ability information of described UE to described MME, and receive the ability information of the described UE that described MME returns, adjudicate the redirected cell set of described UE and be handed down to described UE according to the ability information of described UE; Described MME is used to described ENB that the ability information of described UE is provided.
Again on the one hand, the embodiment of the invention also provides a kind of ENB, comprise RRC connection request receiver module, UE ability information processing module, be redirected the sub-district judging module and refuse information issues module, described RRC connection request receiver module is used to receive the RRC connection request of UE; Described UE ability information processing module is used for asking to MME the ability information of described UE, and receives the ability information of the described UE that described MME returns; Described redirected sub-district judging module, the ability information that is used for the described UE that receives according to described UE ability information processing module is adjudicated the redirected cell set of described UE; Described refuse information issues module, and the redirected cell set that is used for described redirected sub-district judging module is adjudicated described UE is handed down to described UE by the RRC connection refused message.
The technical scheme of the embodiment of the invention has the following advantages, because by the message interaction between ENB and the MME, make ENB can learn the ability information of current UE, thereby make it ensure the smooth execution that is redirected flow process accurately for described UE determines to be redirected the sub-district.
Description of drawings
Fig. 1 is the network architecture diagram of SAE/LTE evolution system in the prior art;
Fig. 2 is a prior art E-UTRAN network structure;
Fig. 3 sets up flow chart for the prior art initial context;
Fig. 4 is the reorientation method flow chart of the UE of the embodiment of the invention one;
Fig. 5 is the reorientation method flow chart of the UE of the embodiment of the invention two;
Fig. 6 is the reorientation method flow chart of the UE of the embodiment of the invention three;
Fig. 7 is the structure chart of the Redirectional system of embodiment of the invention UE.
Embodiment
The embodiment of the invention is mutual by message between ENB and the MME, make ENB can learn the ability information of the UE of the current RRC of foundation connection request from MME, thereby ENB can accurately be redirected the sub-district for UE is definite according to the ability information of the UE that obtains, ensures the smooth execution that is redirected flow process.
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:
As shown in Figure 4, be the reorientation method flow chart of the UE of the embodiment of the invention one.Can obtain the ability information of the UE of the current RRC of foundation connection request by this embodiment E NB, determine to be redirected the sub-district thereby ENB can accurately be UE, this embodiment may further comprise the steps:
Step S401, ENB receive the RRC connection request of UE, UE request ENB set up with UE between RRC be connected.
Step S402, ENB send the UE context request message to MME after receiving the RRC connection request of UE, the ability information of asking described UE, and notice MME transmits the ability information of described UE to ENB.Wherein the ability information of UE comprises terminal capability and/or user signing contract information, E-UTRAN/UTRAN frequency that terminal capability such as UE can insert or GERAN frequency range etc., and the preferred RAT of user signing contract information such as UE (Radio Access Type, wireless access type) information etc.
Step S403, MME sends the UE context response information to ENB, with corresponding UE ability information, both terminal capability and and user signing contract information send to ENB.
Step S404, ENB adjudicates the redirected cell set of described UE according to the ability information of the described UE that receives from described MME, and is issued to UE by the RRC connection refused message in the adding redirection information.
Step S405, UE reselect to suitable cell according to redirection information after receiving the RRC connection refused message that ENB issues.
By the foregoing description, can make ENB obtain the ability information of the UE of the current RRC of carrying out connection, thereby can being this UE according to the ability information of this UE, this ENB selects redirected accurately sub-district.
As shown in Figure 5, be the reorientation method flow chart of the UE of the embodiment of the invention two.If the ENB of LTE sub-district does not obtain the ability information of UE in this embodiment, then at ENB because overload can't be accepted the access of this UE, then ENB can send the RRC refuse information to UE, notice UE is redirected to proper cell.When yet this UE is redirected, may be because of factors such as self-ability and user signing contract informations and can't reselect to the sub-district of appointment, that is to say that ENB is that the re-selecting cell of this UE appointment is improper, this UE can't insert, therefore this UE can gravity treatment go back to current LTE sub-district, initiates the RRC connection request to this ENB again.Under the overweight situation of this ENB load,, then can cause bigger call setup time-delay if many retry RRC of UE connect the process of setting up.Therefore can address the above problem by present embodiment, may further comprise the steps:
Step S501, UE sends arbitrary access front signal to ENB, triggers random access procedure.
Step S502, ENB send accidental access response to UE after the request of access at random of receiving UE, the access request of UE is accepted in expression
Step S503, UE sends the RRC connection request to ENB, request ENB set up with UE between RRC be connected.
Step S504, ENB sends to UE and connects resolution message simultaneously, and the RRC connection request of its transmission of indication UE is received.
After step S505, ENB receive the RRC connection request, according to the factors such as load information of its current ENB, the access control judgement is carried out in the access request of UE, whether judgement UE need be redirected to other sub-districts.
Step S506, if the load information judgement UE according to current ENB need be redirected to other sub-districts, redirected sub-district then in order to determine that UE can insert, ENB sends the UE context request message to MME, ask the ability information of this UE, this UE context request message is transmitted terminal ability information in order to notice MME to ENB.Wherein the ability information of UE comprises terminal capability and/or user signing contract information, E-UTRAN/UTRAN frequency that terminal capability such as UE can insert or GERAN frequency range etc., and the preferred RAT information of user signing contract information such as UE etc.
Step S507, MME sends the UE context response information to ENB, and the ability information of corresponding UE is sent to ENB
Step S508, ENB adjudicate the redirected cell set of UE according to the ability information of the terminal of UE, and are issued to UE by the RRC connection refused message in the adding redirection information.UE reselects to suitable cell according to redirection information after receiving the RRC connection refused message that ENB issues.
By the message interaction of ENB in the foregoing description and MME, make ENB can obtain the ability information of UE, thereby can be redirected the sub-district accurately for this UE judgement according to the ability information of UE.
As shown in Figure 6, be the reorientation method flow chart of the UE of the embodiment of the invention three.Set up under the scene in VoIP (Voiceover Internet Protocol) business, if in the time of therefore can't allowing this VoIP service access because the current dynamic condition of this UE ability, adjacent area ability and ENB limits, then ENB often directly is redirected to the GERAN sub-district with UE from current LTE sub-district, and this embodiment may further comprise the steps:
Step S601, UE triggers voip call and sets up flow process.
Step S602, UE sends RRC connection request message to ENB, carries the VoIP indication in this message, and indication ENB this time calls out and is the VoIP audio call.
Step S603, ENB is after receiving this message of RRC connection request, judge whether the adjacent area of this ENB supports the VCC function, judge promptly whether the adjacent area supports PS (Packet Switched, packet switching) switches VCC (voice call continuity such as DTM (dual transfer mode, double-transmission mode) pattern, continuous voice call) correlation function, or do not have the same UTRAN adjacent area that covers etc.If the VCC function is not supported in the adjacent area of current LTE sub-district, then the situation that follow-up VoIP goes offline may appear in explanation, therefore ENB can directly issue the RRC connection refused message and give UE, indication UE reselects to GERAN or UTRAN sub-district, indicate described UE to be transformed into CS (Circuit Switched, circuit switching) territory and carry out CS audio call flow process.Can support the VCC function if judge the adjacent area of current LTE sub-district, then ENB is to the ability information of MME request UE, the i.e. terminal capability of this UE and user signing contract information.
Step S604, ENB sends the UE context request message to MME, and MME transmits terminal capability and CAMEL-Subscription-Information to ENB in order to notice.Terminal capability mainly comprises E-UTRAN/UTRAN frequency or the GERAN frequency range that UE can insert, and whether UE supports the PS territory to switch and whether UE supports VCC functions such as DTM pattern; CAMEL-Subscription-Information then comprises the preferred RAT information of UE etc.
Step S605, MME sends the UE context response information to ENB, and relevant terminal ability and user signing contract information are sent to ENB.
Step S606, ENB adjudicate this UE and whether support the VCC function according to the terminal capability of UE.If UE supports this VCC function because this moment this ENB the adjacent area also support the VCC function, so professional permission of VoIP that ENB adjudicates this UE request insert, and send initial UE message to MME and trigger the VoIP business and set up flow process.If UE do not support this function, then ENB selects the redirected sub-district that can insert according to the ability information of UE, triggers UE and reselects to suitable cell.
Step S607, if this UE does not support this VCC function, then ENB is issued to UE with the RRC connection refused message, carries the redirection information of corresponding UE in this RRC connection refused message.
Step S608, UE reselect to suitable cell according to redirection information after receiving the RRC connection refused message that ENB issues, and initiate CS territory context and set up flow process.
Step S609, UE sends SETUP message initiation CS territory audio call to MSC and sets up flow process.
After step S610, MSC received this message, to UE feedback CALL PROCEEDING message, the indicating call request of setting up was accepted.
Step S611, MSC sets up our UE after the user plane bearer of opposite end UE in control, sends Alerting message to UE, and notice UE user plane is set up and is finished.
Step S612, behind the other side UE off-hook, MSC sends connection message to UE, and the indication user plane receives, and whole call setup is finished.
Step S613, UE finishes to the connection of MSC feedback.
By the foregoing description, can be when the VoIP business be set up the base station be the redirected sub-district that the UE judgement is fit to according to the ability information of UE.In this embodiment, the acquisition process of UE ability and CAMEL-Subscription-Information also can be set up flow process with existing initial context and combines.
As shown in Figure 7, structure chart for the Redirectional system of embodiment of the invention UE, this system comprises ENB1, UE2 and MME3, wherein UE2 is used for sending the RRC connection request to ENB1, and receiving the redirected cell set that ENB1 returns, redirected cell set is handed down to UE2 by the redirect message of RRC connection refused message; ENB1 is used for after receiving the RRC connection request of UE2, to the ability information of MME3 request UE2, and receives the ability information of the UE2 that MME3 returns, according to the redirected cell set of the ability information judgement UE2 of UE2 and be handed down to UE2; MME3 is used to ENB1 that the ability information of UE is provided.
Wherein, ENB1 comprises that RRC connection request receiver module 11, UE ability information processing module 12, redirected sub-district judging module 13 and refuse information issue module 14.RRC connection request receiver module 11 is used to receive the RRC connection request of UE2; UE ability information processing module 12 is used for sending the UE context request message to MME3, the ability information of request UE2, and receive the ability information of the UE2 that MME3 returns; Redirected sub-district judging module 13 is used for the redirected cell set according to the ability information judgement UE2 of the UE2 of UE ability information processing module 12 receptions; Refuse information issues the redirected cell set that module 14 is used for being redirected sub-district judging module 13 judgement UE2 and is handed down to UE2 by the RRC connection refused message.
Wherein, ENB1 comprises that also being redirected judge module 15 is used for adjudicating whether UE2 need be redirected to other sub-districts, if judgement needs UE2 is redirected to other sub-districts, then notifies the ability information of UE ability information processing module 12 to MME3 request UE2.
Wherein, ENB1 also comprises VoIP indication judge module 16 and adjacent area judge module 17, and VoIP indication judge module 16 is used for judging whether the RRC connection request that RRC connection request receiver module 11 receives carries the VoIP indication; Adjacent area judge module 17 is used for when VoIP indication judge module 16 judges that the RRC connection request carries the VoIP indication, judge whether the adjacent area of ENB1 supports the VCC function, if the VCC function is supported in the adjacent area of this ENB1, then notify the ability information of UE ability information processing module 12 to MME3 request UE2.
Wherein, ENB1 also comprises VCC function judge module 18 and access module 19, VCC function judge module 18 is used for the ability information according to the UE2 of UE ability information processing module 12 receptions, judge whether this UE2 supports the VCC function, if described UE2 supports the VCC function, then notify access module 19 to allow the VoIP service access of UE2 request; If UE2 does not support the VCC function, then notice is redirected sub-district judging module 13 is adjudicated this UE2 according to the ability information of UE2 redirected cell set.
By the message interaction of ENB in the said system and MME, make ENB can obtain the ability information of UE, thereby can be redirected the sub-district accurately for this UE judgement according to the ability information of UE.And the said system of the embodiment of the invention also can satisfy in the VoIP business to be set up under the scene, and ENB is that the UE judgement is redirected the sub-district accurately.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1, the reorientation method of a kind of UE is characterized in that, may further comprise the steps:
Base station ENB receives the RRC connection request of user equipment (UE);
Described ENB is to the ability information of the described UE of mobile management entity MME request;
Described ENB adjudicates the redirected cell set of described UE according to the ability information of the described UE that receives from described MME, and is handed down to described UE.
2, the reorientation method of UE according to claim 1 is characterized in that, and is before described ENB asks the ability information of described UE to MME, further comprising the steps of:
Whether described ENB judgement needs described UE is redirected to other sub-districts;
If judgement needs described UE is redirected to other sub-districts, then ask the ability information of described UE to described MME.
3, the reorientation method of UE according to claim 1 is characterized in that described ENB will be redirected cell set and be handed down to UE, specifically may further comprise the steps:
Described ENB adds the redirected cell set of judgement in the redirection information to, is handed down to described UE by the RRC connection refused message.
4, the reorientation method of UE according to claim 1 is characterized in that, and is before described ENB asks the ability information of described UE to MME, further comprising the steps of:
Judge and whether carry the VoIP indication in the described RRC connection request;
If carry the VoIP indication in the described RRC connection request, then described ENB judges whether the adjacent area of described ENB supports the VCC function;
If the adjacent area support voice call continuity VCC function of described ENB, then described ENB asks the ability information of described UE to MME.
5, as the reorientation method of UE as described in the claim 4, it is characterized in that, after described ENB judges whether the adjacent area of described ENB supports the VCC function, further comprising the steps of:
If the VCC function is not supported in the adjacent area of described ENB, then described ENB directly issues RRC connection request refusal information to described UE; Indicate described UE to be transformed into the CS territory and carry out CS audio call flow process.
6, the reorientation method of UE according to claim 1 is characterized in that, described ENB adjudicates the redirected cell set of described UE according to the ability information of the described UE that receives from described MME, specifically may further comprise the steps:
Described ENB receives the ability information of described UE from described MME;
Described ENB judges whether support voice call continuity VCC function of described UE according to the ability information of described UE;
If described UE supports the VCC function, then described ENB allows described UE to insert;
If described UE does not support the VCC function, then described ENB adjudicates the redirected cell set of described UE according to the ability information of described UE, and indicates described UE to be transformed into the CS territory and carry out CS audio call flow process.
7, as the reorientation method of UE as described in claim 1 or 6, it is characterized in that the ability information of described UE comprises terminal capability and/or user signing contract information.
8, the Redirectional system of a kind of UE is characterized in that, comprises ENB, UE and MME,
Described UE is used for sending the RRC connection request to described ENB, and receives the redirected cell set that described ENB returns;
Described ENB, be used for after receiving the RRC connection request of described UE, ask the ability information of described UE to described MME, and receive the ability information of the described UE that described MME returns, adjudicate the redirected cell set of described UE and be handed down to described UE according to the ability information of described UE;
Described MME is used to described ENB that the ability information of described UE is provided.
9, a kind of ENB is characterized in that, comprises that RRC connection request receiver module, UE ability information processing module, redirected sub-district judging module and refuse information issue module,
Described RRC connection request receiver module is used to receive the RRC connection request of UE;
Described UE ability information processing module is used for asking to MME the ability information of described UE, and receives the ability information of the described UE that described MME returns;
Described redirected sub-district judging module, the ability information that is used for the described UE that receives according to described UE ability information processing module is adjudicated the redirected cell set of described UE;
Described refuse information issues module, and the redirected cell set that is used for described redirected sub-district judging module is adjudicated described UE is handed down to described UE by the RRC connection refused message.
10, as ENB as described in the claim 9, it is characterized in that, also comprise redirected judge module, whether be used for judgement needs described UE is redirected to other sub-districts, if judgement needs described UE is redirected to other sub-districts, then notify described UE ability information processing module to ask the ability information of described UE to described MME.
11, as ENB as described in the claim 9, it is characterized in that, also comprise VoIP indication judge module and adjacent area judge module,
Described VoIP indication judge module is used for judging whether the RRC connection request that described RRC connection request receiver module receives carries the VoIP indication;
Described adjacent area judge module, be used for when described VoIP indication judge module judges that described RRC connection request carries the VoIP indication, judge whether the adjacent area of described ENB supports the VCC function, if the VCC function is supported in the adjacent area of described ENB, then notify described UE ability information processing module to ask the ability information of described UE to described MME.
12, as ENB as described in claim 9 or 11, it is characterized in that, also comprise VCC function judge module and access module,
Described VCC function judge module is used for the ability information according to the described UE of UE ability information processing module reception, judges whether described UE supports the VCC function, if described UE supports the VCC function, then notifies described access module to allow described UE to insert; If described UE does not support the VCC function, then notify described redirected sub-district judging module to adjudicate the redirected cell set of described UE according to the ability information of described UE.
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2007
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