CN102348191A - Context acquisition method and equipment for user equipment (UE) - Google Patents
Context acquisition method and equipment for user equipment (UE) Download PDFInfo
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- CN102348191A CN102348191A CN2010102470874A CN201010247087A CN102348191A CN 102348191 A CN102348191 A CN 102348191A CN 2010102470874 A CN2010102470874 A CN 2010102470874A CN 201010247087 A CN201010247087 A CN 201010247087A CN 102348191 A CN102348191 A CN 102348191A
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Abstract
The invention discloses a context acquisition method and context acquisition equipment for user equipment (UE). The method comprises that: if a target base station does not store the context of the UE when receiving a radio resource control (RRC) connection reestablishment request message from the UE, the target base station transmits a radio link failure (RLF) indication message to a source base station, wherein the RLF indication message carries indication information requiring the feeding-back of the context of the UE; and the target base station receives a response message of the RLF indication message from the source base station, wherein the response message carries context, acquired according to the indication information by the source base station, of the UE. By the method and the equipment, the target base station not storing the context of the UE can acquire the context of the UE only by the interaction of the two messages, thereby reducing signaling interaction and further increasing the connection reestablishment success rate of the UE.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of UE context acquisition methods and equipment.
Background technology
LTE (Long Term Evolution; Long Term Evolution) topological structure of mobile communications network as shown in Figure 1; With traditional by Node B (Node B; NB), radio network controller (Radio NetworkController; RNC) with core net (Core Network; CN) the three node layer network configurations of Gou Chenging are compared, and (Evolution Node B eNB) forms with core net two-layer node network structure the LTE network by the Node B of evolution.ENB not only has the function of original NB, can also accomplish the most function of original RNC, comprising: physical layer, MAC layer, scheduling, access control, carrying control, access mobile management etc.Therefore, the two-tier network structure of LTE and traditional three-layer network structure simplified in comparison network configuration, reduced signaling process simultaneously, and then shortened delay.
In the LTE network, bottom adopts the IP transmission between the eNB, logically connects mutually through X2 interface, promptly forms Mesh type network.The mobility of UE (UserEquipment, subscriber equipment) in whole network can be effectively supported in network configuration design through such, guarantees the seamless switching of UE.Therefore, LTE becomes the mainstream technology in the present wireless network.
In the LTE network, UE switches to control through the UE auxiliary network between different districts and realizes that this switching flow mainly comprises following four steps: measure, report, adjudicate and carry out.Concrete, when source node according to this UE of measurement report decision of UE and destination node when Target cell switches, can directly carry out information interaction through X2 interface and destination node, accomplish the resource preparation of Target cell; Order UE to switch afterwards to Target cell; Behind handover success, destination node notification source node discharges the Radio Resource of original sub-district.In addition, source node also need send the data of not sending as yet to destination node, and upgrades the node relationships of user plane and control plane.
In practical application, UE from the cell-of-origin to the process that Target cell switches, because the wireless transmission environment is to the interference of wireless signal or factor such as the system failure occurs and can cause RLF (Radio LinkFailure, Radio Link Failure).If occur Radio Link Failure in the handoff procedure, then UE can accomplish wireless link recovery in the sub-district that the node of having stored this UE context data is managed.If do not store this UE context (base station of this Target cell can be described as the Unprepared node, and is as follows) in the Target cell, then need at first obtain this UE context, could connect with this UE then.
In the prior art; The Unprepared node obtains the contextual signalling interactive process of UE as shown in Figure 2; May further comprise the steps: the node (like the eNB1 among Fig. 2) that (1) Unprepared node (like the eNB among Fig. 2 2) is connected to UE recently sends RLF Indication message (Radio Link Failure Indication message), and RLF has taken place this UE of node that is used to notify UE to be connected to recently.(2) the Unprepared node sends UE Context Inquiry message (UE context query messages) to the node that UE is connected to recently, and the node that is used to indicate UE to be connected to recently sends the UE context.(3) node that is connected to recently of UE sends UE Context Response message (UE context response information) to the Unprepared node, wherein, carries the context of this UE in this UE Context Response message.
In realizing process of the present invention, the inventor finds to exist in the prior art following problem:
When UE need carry out wireless link recovery with the Unprepared node; This Unprepared node need just can obtain this UE context through at least 3 X2 interface message with the node that UE is connected to recently; It is thus clear that; This process more complicated; Signaling interaction times is many; And the time prolong, rebulid the success rate that is connected thereby reduced UE with this Unprepared node.
Summary of the invention
The present invention provides a kind of UE context acquisition methods and equipment, obtains in order to solve Unprepared node of the prior art that the UE context procedures is loaded down with trivial details, time prolongs, and then cause UE to rebulid the low problem of success rate of connection.
The UE context acquisition methods that the embodiment of the invention provides comprises:
When target BS is rebuild request message in the radio resource control RRC that receives the user equipment (UE) transmission; If said target BS confirms self not store the context of said UE; Then send Radio Link Failure RLF Indication message, carry the contextual indication information that requires feedback UE in the said RLF Indication message to source base station;
Said target BS receives the response message of the said RLF Indication message that said source base station returns, and carries the context of the said UE that said source base station gets access to according to said indication information in the said response message.
The base station equipment that the embodiment of the invention provides comprises:
First receiver module is used to receive the RRC reconstruction request message that UE sends;
Determination module is used for receiving said RRC when rebuilding request message at said first receiver module, confirms whether self stores the context of said UE;
Sending module is used for when said determination module is confirmed self not store the context of said UE, sends the RLF Indication message to source base station, carries the contextual indication information that requires feedback UE in the said RLF Indication message;
Second receiver module; Be used for after said sending module sends the RLF Indication message; Receive the response message of the said RLF Indication message that said source base station returns, carry the context of the said UE that said source base station gets access to according to said indication information in the said response message.
Useful technique effect of the present invention comprises:
In the embodiment of the invention; When target BS self is not stored the context of this UE at the RRC reconstruction request message of receiving UE; The contextual indication information of feedback UE is carried in the RLF Indication message through negating; And send to source base station, return to this target BS in the response message thereby make source base station obtain the UE context and to be carried on according to this indication information.Compared with prior art; The embodiment of the invention just can be obtained the UE context to source base station through two interacting messages (that is: the response message of RLF Indication message and RLF Indication message); Thereby saved Signalling exchange; Reduced time delay, and then improved UE and do not stored the contextual target BS of UE and rebulid the success rate that is connected.
Description of drawings
Fig. 1 is a LTE topology of networks sketch map in the prior art;
Fig. 2 obtains the contextual Signalling exchange figure of UE for Unprepared node in the prior art;
Fig. 3 rebuilds the schematic flow sheet that connects for the UE that the embodiment of the invention provides at Target cell;
The sketch map of the RLF Indication message content that Fig. 4 provides for the embodiment of the invention;
The Unprepared node that Fig. 5 provides for the embodiment of the invention obtains the contextual Signalling exchange figure of UE;
The structural representation of the base station equipment that Fig. 6 provides for the embodiment of the invention.
Embodiment
The problems referred to above to the prior art existence; The embodiment of the invention provides a kind of UE context to obtain scheme; Make the Unprepared node only need just can obtain the UE context through 2 X2 interface message with source node; Thereby saved Signalling exchange; Reduced time delay, and then improved UE and rebulid the success rate that is connected with the Unprepared node.
Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
The UE that Fig. 3 shows the embodiment of the invention to be provided rebuilds the schematic flow sheet that connects at Target cell.This flow process has been described in the LTE system; Target cell (like the sub-district B among Fig. 3) receives the UE request after the request of connection reconstruction is carried out in its sub-district; The sub-district (like the sub-district A Fig. 3) that before this UE, connected because the contextual information of this UE is not stored in this sub-district obtains the contextual information of this UE, thereby carries out the connection reconstruction of this UE according to the UE contextual information that gets access to.Flow process shown in Figure 3 can may further comprise the steps:
Step 301, UE sends RRC to the eNB of Target cell B (like the eNB B among Fig. 3) and rebuilds request message (RRC Connection Reestablishment Request message) after RLF takes place.This RRC rebuilds the sign that carries the sub-district that UE sign and this UE connected in request message, and this cell ID is generally the sign of the sub-district that this UE is connected to recently, can be expressed as Last CellID, and the Last CellID in the present embodiment is the sign of sub-district A.Wherein, before the sign of the sub-district that is connected to recently is meant that this RLF takes place UE, successfully set up the sign of the sub-district that Radio Link connects at last, store this UE in this sub-district usually and set up Radio Link and connect necessary contextual information.
What need illustrate is that the sub-district that the UE that relates in the embodiment of the invention connected also can be called as cell-of-origin (like the sub-district A among Fig. 3); Accordingly, the base station of managed source sub-district (like the eNB A among Fig. 3) also can be called as source base station.In the embodiment of the invention, the two only is the difference on the appellation, and the implication of its representative is identical.
Need to prove; There are two kinds of situation usually in the reason that causes UE that RLF takes place: first kind of situation; Set up under the situation that Radio Link is connected at UE and cell-of-origin (like the pairing sub-district A of the eNB A among Fig. 3), thus since the wireless transmission environment to the interference of wireless signal or this UE that factor such as the system failure causes and the Radio Link connection failure of cell-of-origin occur; Second kind of situation, when UE carried out sub-district switching (for example: the sub-district A from Fig. 3 switches to sub-district B), the Radio Link connection failure took place in the UE that causes owing to the cell switch process failure.Wherein, possibly there are following three kinds of situations in the cell switch process failure: too early switching (that is: UE is too early switching time to sub-district B) has taken place in first kind of situation: UE; Second kind of situation, taken place to cross and switched (that is: UE is late excessively switching time to sub-district B) evening in UE; The third situation, UE has switched to wrong sub-district (for example, having switched to sub-district C).Under above three kinds of situations, UE both with the Radio Link connection failure of cell-of-origin (being sub-district A), simultaneously, this UE does not successfully set up Radio Link with selected sub-district (being sub-district B) again and is not connected.
During any one situation, UE all needs the select target sub-district to carry out wireless link recovery in above-mentioned two kinds of situation take place.Usually, the selection of this Target cell can but be not limited to following mode: UE according to the signal strength signal intensity of measuring each adjacent cell, thereby choose the best sub-district of signal strength signal intensity as Target cell.The embodiment of the invention does not limit the mode of specifically choosing of Target cell.
Step 302 after eNB B receives the RRC reconstruction request message of UE transmission, judges self whether to store and the corresponding UE contextual information of this UE sign according to the UE sign of wherein carrying.If judged result is for being then to forward step 303-305 to; If judged result then forwards step 306-309 to for not.
Step 303; ENB B rebuilds the sign of the sub-district that this UE of carrying in the request message connected according to RRC; Send RLF Indication message (RLF Indication message) to the eNB of respective cell (like the eNB A of the sub-district A among Fig. 3), the indication information that carries this UE sign in this RLF Indication message and do not require opposite end feedback UE contextual information.
Usually; RLF because of taking place after Target cell sends RRC reconstruction request message in UE; Target cell can send RLF Indication message to respective cell according to the Last CellID that carries in this message; This RLF Indication message is used to notify this UE of this sub-district that RLF has taken place, and this RLF Indication message can be sent through X2 interface.
The embodiment of the invention is expanded existing RLF Indication message, promptly increases sign and indicates whether requirement opposite end feedback UE contextual information.Preferably, be to save signaling consumption, can increase a bit and distinguish Target cell and whether require to obtain the UE contextual information, promptly whether require opposite end feedback UE contextual information.
For example: when Target cell stored the UE contextual information, this sign was set to " 0 ", showed that Target cell does not require opposite end feedback UE contextual information; When Target cell did not store the UE contextual information, this sign was set to " 1 ", showed Target cell requirement opposite end feedback UE contextual information.Fig. 4 shows the concrete form of the RLF Indication message after a kind of expansion, and wherein, UEContext Request is the sign that increases newly in the embodiment of the invention, is used to indicate whether requirement opposite end feedback UE context.
Step 304, eNB A is according to the sign that carries in the RLF Indication message that receives, and judging need be to eNB B feedback UE contextual information.
In this step; The sign that eNB A feeds back the UE contextual information according to whether requiring of carrying in the RLF Indication message that receives is judged not needs behind eNB B feedback UE contextual information, can be not to the response message of eNB B feedback RLF Indication message.
Step 305, eNB B is according to RRC connection foundation request that receives and the contextual information of this UE, and B is that UE sets up the Radio Link connection in the sub-district.
Concrete, because Target cell stores the UE contextual information, therefore, UE can set up Radio Link with Target cell and be connected.Wherein, the detailed process of setting up the Radio Link connection can adopt existing techniques in realizing, and the embodiment of the invention repeats no more at this.
Need to prove, the execution sequence of step 305 and step 304, the embodiment of the invention does not limit this.
Step 306; ENB B rebuilds the sign of the sub-district that this UE of carrying in the request message connected according to RRC; Send RLF Indication message (RLF Indication message) to the eNB of respective cell (like the eNB A of the sub-district A among Fig. 3), the indication information that carries this UE sign in this RLF Indication message and require opposite end feedback UE contextual information.
Wherein, about how to indicate the opposite end contextual mode of feedback UE to carry out detailed description in step 303, repeat no more at this through expansion RLF Indication message.
Step 307, eNB A judges and need feed back the UE contextual information to eNB B, and inquire the contextual information of this UE according to the sign of this UE according to the sign that carries in the RLF Indication message that receives.
Take place successfully to set up the sub-district that Radio Link connects before the RLF because sub-district A is UE, therefore, store the contextual information of this UE.
Step 308, eNB A returns the response message of RLF Indication message to eNB B, carries the contextual information of this UE that inquires in this response message.
In the embodiment of the invention, in order to realize having increased response message (like RLF Response message) to RLF Indication message and carried the UE contextual information to the purpose of Target cell feedback UE contextual information.This response message can send through X2 interface.
Step 309, eNB B is according to RRC connection foundation request that receives and the contextual information of this UE, and B is that UE sets up the Radio Link connection in the sub-district.
In the above-mentioned flow process, step 306-308 is that Target cell does not store under the situation of UE contextual information at it, obtains the process of this UE contextual information from the sub-district that this UE connected.
Rebuild the schematic flow sheet that connects at Target cell in conjunction with UE shown in Figure 3; As shown in Figure 5; Do not obtain the contextual Signalling exchange figure of UE for storing the contextual Target cell of UE (that is: the Unprepared sub-district also is sub-district B shown in Figure 5 simultaneously) to the sub-district (sub-district A as shown in Figure 5) that UE connected.
In another embodiment of the present invention; Different with above-mentioned flow process is; When the base station judges self of Target cell stores the UE contextual information; Can in RLF Indication message, not carry the sign that is used to represent whether to require opposite end feedback UE contextual information; Like this; The cell-of-origin can be handled according to existing mode, and Target cell also can carry out the connection reconstruction of this UE according to existing procedure.
Need to prove that various embodiments of the present invention are applicable to that the base station of the sub-district that the base station of Target cell was connected with UE is arranged in the application scenarios of heterogeneous network.For example: the base station of Target cell is arranged in the 3G system, and the base station of the sub-district that was connected with UE is arranged in the 2G system; Perhaps, the base station of Target cell can be arranged in family base station system, and the base station of the sub-district that was connected with UE is arranged in the macro base station system.The present invention does not limit the particular type of heterogeneous network.
Can find out through above description; When Target cell need obtain the UE contextual information; Can will whether require the indication information of opposite end feedback UE contextual information to add in the RLF Indication message; Thereby make the sub-district that this UE connected can be according to this RLF Indication message, the response message through the RLF Indication message returns the UE contextual information to Target cell.Therefore; In the technical scheme that the embodiment of the invention provides; The sub-district that Target cell was connected with UE only need can be accomplished the request and the acquisition process of UE contextual information through RLF Indication message and these two X2 interface message of RLFResponse message; Reduced the reciprocal process of the minizone message that Target cell was connected with UE; Thereby realized that Target cell obtains the UE contextual information more simply rapidly; Shortened the time that UE carries out the RRC link-recovery, improved UE and rebulid link-attached success rate.
Based on identical technical conceive, the embodiment of the invention also provides a kind of base station equipment, can be applicable to the above-mentioned flow process of the embodiment of the invention.
As shown in Figure 6, the base station equipment that the embodiment of the invention provides can comprise: first receiver module 601, determination module 602, sending module 603 and second receiver module 604, wherein:
Sending module 603 is used for when determination module 602 is confirmed self not store the context of said UE, sending the RLF Indication message to source base station, carries the contextual indication information that requires feedback UE in the said RLF Indication message;
Above-mentioned sending module 603 can send said RLF Indication message through X2 interface; Also can rebuild the sign of the sub-district that the said source base station that carries in the request message manages according to said RRC, the RLF Indication message is sent in the last base station that is connected to before said RLF takes place said UE; Also can when said determination module 602 is confirmed self to store the context of said UE, send the RLF Indication message, carry the contextual indication information that does not require feedback UE in the said RLF Indication message to said source base station; Wherein, said indication information is the indicating bit of 1 bit.
Above-mentioned second receiver module 604 can receive the response message of said RLF Indication message through X2 interface.
Wherein, each module of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize through hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding; Technical scheme of the present invention can be come out with the embodied of software product; It (can be CD-ROM that this software product can be stored in a non-volatile memory medium; USB flash disk; Portable hard drive etc.) in; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the sketch map of a preferred embodiment, module in the accompanying drawing or flow process might not be that embodiment of the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (8)
1. a UE context acquisition methods is characterized in that, may further comprise the steps:
When target BS is rebuild request message in the radio resource control RRC that receives the user equipment (UE) transmission; If said target BS confirms self not store the context of said UE; Then send Radio Link Failure RLF Indication message, carry the contextual indication information that requires feedback UE in the said RLF Indication message to source base station;
Said target BS receives the response message of the said RLF Indication message that said source base station returns, and carries the context of the said UE that said source base station gets access to according to said indication information in the said response message.
2. the method for claim 1 is characterized in that, said target BS and said source base station are through the response message of mutual said RLF Indication message of X2 interface and said RLF Indication message.
3. the method for claim 1; It is characterized in that; If said target BS confirms self to store the context of said UE, then send the RLF Indication message to said source base station, carry the contextual indication information that does not require feedback UE in the said RLF Indication message.
4. like each described method of claim 1 to 3, it is characterized in that said indication information is the indicating bit of 1 bit.
5. a base station equipment is characterized in that, comprising:
First receiver module is used to receive the RRC reconstruction request message that UE sends;
Determination module is used for receiving said RRC when rebuilding request message at said first receiver module, confirms whether self stores the context of said UE;
Sending module is used for when said determination module is confirmed self not store the context of said UE, sends the RLF Indication message to source base station, carries the contextual indication information that requires feedback UE in the said RLF Indication message;
Second receiver module; Be used for after said sending module sends the RLF Indication message; Receive the response message of the said RLF Indication message that said source base station returns, carry the context of the said UE that said source base station gets access to according to said indication information in the said response message.
6. base station equipment as claimed in claim 5 is characterized in that said sending module specifically is used for, and sends said RLF Indication message through X2 interface;
Said second receiver module specifically is used for, and receives the response message of said RLF Indication message through X2 interface.
7. base station equipment as claimed in claim 5; It is characterized in that; Said sending module also is used for; When said determination module is confirmed self to store the context of said UE; Send the RLF Indication message to said source base station, carry the contextual indication information that does not require feedback UE in the said RLF Indication message.
8. like each described base station equipment of claim 5 to 7, it is characterized in that said indication information is the indicating bit of 1 bit.
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Application publication date: 20120208 |