CN102355656B - Method and device for acquiring identity mark related information of UE (user equipment) - Google Patents
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Abstract
The invention relates to the field of telecommunication, and discloses a method and a device for acquiring the identity mark related information of UE (user equipment), and the method and device provided by the invention are used for ensuring the successful execution of a UE attach procedure. The method is implemented as follows: in an identity mark request procedure of undistributed TEIDs (tunnel endpoint identifiers), an MME (mobility management entity) adopts the number of a UDP (user datagram protocol) port to match an identity mark request message and an identity mark response message, thereby determining a processing unit to which the identity mark response message is transmitted to according to the number of the UDP port so as to carry out follow-up processing, so that the MME can timely obtain the identity mark related information of the UE carried in the identity mark response message, thereby ensuring the successful execution of the UE attach procedure, preventing the interruption and failure of the UE attach procedure, and ensuring the overall performance of a system.
Description
Technical field
The present invention relates to the communications field, particularly a kind of method and device that obtains UE identify label relevant information.
Background technology
At LTE(Long Term Evolution, Long Term Evolution) in system, consult shown in Fig. 1, the protocol stack adopted between UE and eNodeB is: L1 layer-> MAC(Media Access Control, the media access control)-> RLC(Radio Link Control, wireless link is controlled) layer-> PDCP(Packet Data Convergence Protocol, packet data convergence protocol) layer-> RRC(Radio Resource Control, radio resource control) layer; And eNodeB and MME(Mobility Management Entity, the protocol stack of the employing Mobility Management Entity) is: L1 layer-> L2 layer-> IP layer-> SCTP(STREAM CONTROL TRANSMISSION PROTOCOL, SCTP) layer-> S1-AP(S1 Application of Interface) layer.As shown in Figure 1, be provided with separately a NAS(Non Access Stratum between UE and MME, Non-Access Stratum), at UE, MME being carried out to ATTACH(, adhere to) time, realize the direct communication between UE and MME.
In the ATTACH of UE process, if UE adopts old, MME(is source MME) the GUTI(globally unique identifier that distributes) to be attached to new MME(be purpose MME), now, new MME need to find old MME according to GUTI, and to the identify label relevant information of old MME acquisition request UE, as, the IMSI(International Mobile Subscriber Identity of UE, international mobile subscriber identity) and contextual information etc., so, now, new MME just needs by the S10 interface, adopt GTP(GPRS Tunnel Protocol, GPRS Tunnel Protocol) agreement sends Identification Request message (identify label request message) to old MME, to obtain the identify label relevant information of UE, correspondingly, old MME also needs the interface by S10, adopt the GTP agreement to send Identification Response message (identify label response message) to new MME, to transmit the identify label relevant information of UE.Identification Request message and Identification Response message all can be sent by the tunnel between MME, and the sign in this tunnel is called TEID(tunneling termination sign), usually by new MME, distributed.Under prior art, stipulate, Identification Request message and Identification Response message all need to adopt the GTPv2 agreement to send, and stipulate in the TS29.274 agreement, the message that adopts the GTEv2 agreement to transmit all need to be carried TEID in protocol header.
In MME, usually be provided with a plurality of processing units (for example, being provided with the polylith veneer), be provided with mapping relations between each processing unit and each TEID, except TEID0, TEID0, for the acquiescence initial value, does not arrange corresponding processing unit; After MME receives a certain message on certain tunnel, the TEID that need to carry according to this message, determine that this message should be sent into to which processing unit carries out subsequent treatment.Yet, be attached to new MME at UE, when new MME initiates identify label request flow process, new MME is the TEID of unallocated chain of command also, but acquiescence adopts corresponding tunnel transmission Identification Request message and the Identification Response message of TEID0, give tacit consent in Identification Request message and Identification Response message and all carry TEID0, like this, new MME is after sending Identification Request message, when receiving Identification Response message, can't determine and this Identification Response message distribution should be carried out to subsequent treatment to which processing unit, thereby can't obtain in time the identify label relevant information of UE, and then cause interruption and the failure of UE attachment flow.
Summary of the invention
The embodiment of the present invention provides a kind of method and device of the UE of obtaining identify label relevant information, in order to guarantee the successful execution of UE attachment flow.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
A kind of method of obtaining UE identify label relevant information comprises:
Determine that UE is attached to this locality by a mobile management entity MME conversion;
Send the identify label request message of the identify label relevant information in order to obtain UE to described MME, carry the local first user data pack protocol udp port number distributed in this identify label request message;
Receive the identify label response message of the identify label relevant information of carrying UE that described MME returns, in this identify label response message, carry udp port No. the second;
Described the first udp port number is compared with the second udp port number, while confirming that both mate, the processing unit that described identify label response message is sent to number setting of corresponding described the first udp port is resolved, to obtain the identify label relevant information of described UE.
A kind of device that obtains UE identify label relevant information comprises:
Communication unit, for when definite UE is attached to this locality by a mobile management entity MME conversion, send the identify label request message of the identify label relevant information in order to obtain UE to described MME, carry the local first user data pack protocol udp port number distributed in this identify label request message, and the identify label response message that receives the identify label relevant information of carrying UE that described MME returns, carry udp port No. the second in this identify label response message;
Dispatching Unit, for described the first udp port number is compared with the second udp port number, while confirming that both mate, be sent to by described identify label response message the processing unit that corresponding described the first udp port number arranges;
Processing unit, resolved for the identify label response message to receiving, to obtain the identify label relevant information of described UE.
A kind of MME, comprise the device of the above-mentioned UE of obtaining identify label relevant information.
A kind of device that UE identify label relevant information is provided comprises:
Receiving element, the identify label request message in order to the identify label relevant information of obtaining UE for receiving that a mobile management entity MME sends, carry the first user data pack protocol udp port number that described MME distributes in this identify label request message;
Transmitting element, in order to return to the identify label response message of the identify label relevant information of carrying UE to described MME, carry udp port No. the second in this identify label response message, wherein, described the second udp port number meets default matching relationship, described matching relationship is for when described the second udp port number mates with described the first udp port number, the processing unit that described MME is sent to number setting of corresponding described the first udp port by described identify label response message is resolved, to obtain the identify label relevant information of described UE.
A kind of MME, the device of the above-mentioned UE of providing identify label relevant information is provided.
A kind of communication system, in this system, UE is attached to target MME by source MME, wherein,
Target MME, for when definite UE is attached to this locality by a source MME conversion, send the identify label request message of the identify label relevant information in order to obtain UE to described source MME, carry the local first user data pack protocol udp port number distributed in this identify label request message, and the identify label response message that receives the identify label relevant information of carrying UE that described source MME returns, carry udp port No. the second in this identify label response message, and described the first udp port number is compared with the second udp port number, while confirming that both mate, the processing unit that described identify label response message is sent to number setting of corresponding described the first udp port is resolved, to obtain the identify label relevant information of described UE.
Source MME, the identify label request message in order to the identify label relevant information of obtaining UE sent for receiving target MME, carry the first user data pack protocol udp port number that described target MME distributes in this identify label request message, and the identify label response message that returns to the identify label relevant information of carrying UE to described target MME, carry udp port No. the second in this identify label response message.
In the embodiment of the present invention, in the identify label request flow process of unallocated TEID, MME adopts udp port number to mate identify label request message and identify label response message, thereby determine that according to udp port number the identify label response message should be sent to which processing unit carries out subsequent treatment, like this, MME can obtain the identify label relevant information of the UE that the identify label response message carries in time, thereby guarantee the smooth execution of UE attachment flow, prevent interruption and the failure of UE attachment flow, guaranteed the overall performance of system.
The accompanying drawing explanation
Fig. 1 be under prior art between UE, eNodeB and MME protocol stack schematic diagram is set;
Fig. 2 be under prior art between MME protocol stack schematic diagram is set;
Fig. 3 A is the apparatus function structural representation that obtains the identify label relevant information of UE in the embodiment of the present invention;
The apparatus function structural representation that Fig. 3 B is identify label relevant information that UE is provided in the embodiment of the present invention;
Fig. 4 is the identify label relevant information detail flowchart that in the embodiment of the present invention, MME obtains UE in identify label request flow process;
Fig. 5 is identify label relevant information that in the embodiment of the present invention, MME obtains UE in the identify label request flow process flow chart of giving an example.
Embodiment
In the process that is attached to new MME by old MME at UE, for the success that guarantees UE is adhered to, new MME needs to obtain in time the identify label relevant information that UE is used on old MME, as, the IMSI of UE and contextual information etc., therefore, new MME need to initiate identify label request flow process, send Identification Request message to old MME, to obtain the identify label relevant information of UE, and old MME can be carried at the identify label relevant information of UE in Identification Response message and sends new MME to, in this process, because new MME does not give the TEID that distributes chain of command, therefore, the TEID that new MME can't carry according to Identification Response message determines that it should be sent into to which processing unit carries out subsequent treatment.
In order to make new MME exactly the Identification Response message distribution of reception to corresponding processing unit be carried out to subsequent treatment, in the embodiment of the present invention, new MME adopts UDP(User Datagram Protocol, User Datagram Protocol) port numbers is distinguished each processing unit, i.e. mapping relations between default each udp port number and each processing unit, and when initiating identify label request flow process, carry the udp port number of distribution in each mutual message, like this, the udp port that new MME just can carry according to a certain message number determines that this message should be sent into to which processing unit carries out respective handling.
Consult shown in Fig. 2, under prior art, the protocol stack between each MME is: L1 layer-> L2 layer-> IP layer-> UDP layer-> GTP-C(is the GTP of chain of command) layer.In the present embodiment, adopt the port numbers of UDP layer to distinguish each processing unit.Relevant regulations according to 29274 agreements, the scope of udp port number is 0-65535, wherein 0-1023 is well-known port number, and 1024-5000 is transient port number, therefore, in the present embodiment, MME distributes a transient port number can to each processing unit when the management udp port, for example, and preferably, for No. 1 processing unit, it is 1024+1=1025 that its transient port number is set.So, consult shown in table 1, in the present embodiment, preferably, the mapping relations between the udp port of preserving in MME number and processing unit can be set to following form:
Table 1
Udp port corresponding to each processing unit number and the position in MME can automatically generate, and be kept in MME to treat follow-up use when MME starts.
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is elaborated.
In the embodiment of the present invention, in communication system, UE is attached to target MME by source MME, wherein,
Target MME, for when definite UE is attached to this locality by a source MME conversion, send the identify label request message of the identify label relevant information in order to obtain UE to source MME, carry the local first user data pack protocol udp port number distributed in this identify label request message, and the identify label response message of the identify label relevant information of carrying UE returned of reception sources MME, carry udp port No. the second in this identify label response message, and the first udp port number is compared with the second udp port number, while confirming that both mate, the processing unit that the identify label response message is sent to number setting of corresponding the first udp port is resolved, to obtain the identify label relevant information of UE.
Source MME, the identify label request message in order to the identify label relevant information of obtaining UE sent for receiving target MME, carry the first user data pack protocol udp port number that target MME distributes in this identify label request message, and the identify label response message that returns to the identify label relevant information of carrying UE to target MME, carry udp port No. the second in this identify label response message.
Consult shown in Fig. 3 A, in the embodiment of the present invention, the device (this device can be arranged in target MME, or, be target MME self) that obtains the User Identity of UE comprises communication unit 30, Dispatching Unit 31 and processing unit 32, wherein,
Communication unit 30, for when definite UE is attached to this locality by a MME conversion, send the Identification Request message of the identify label relevant information in order to obtain UE to this MME, carry the local udp port No. the first distributed in this Identification Request message, and the Identification Response message that receives the identify label relevant information of carrying UE that this MME returns, carry udp port No. the second in this Identification Response message;
Dispatching Unit 31, for the first udp port number is compared with the second udp port number, while confirming that both mate, be sent to by Identification Response message the processing unit that corresponding the first udp port number arranges;
Processing unit 32, resolved for the Identification Response message to receiving, to obtain the identify label relevant information of UE.
Consult shown in Fig. 3 B, in the embodiment of the present invention, provide the device (this device can be arranged in the MME of source, or, be source MME itself) of the identify label relevant information of UE to comprise receiving element 33 and transmitting element 34, wherein,
Receiving element 33, the identify label request message in order to the identify label relevant information of obtaining UE for receiving that a MME sends, carry the first user data pack protocol udp port number that described MME distributes in this identify label request message;
Transmitting element 34, in order to return to the identify label response message of the identify label relevant information of carrying UE to above-mentioned MME, carry udp port No. the second in this identify label response message, wherein, this second udp port number meets default matching relationship, matching relationship is for when the second udp port number mates with the first udp port number, and above-mentioned MME just is sent to the identify label response message processing unit of corresponding the first udp port number setting and is resolved, to obtain the identify label relevant information of UE.
Based on technique scheme, to consult shown in Fig. 4, in the embodiment of the present invention, it is as follows that MME obtains the detailed process of identify label relevant information of UE in identify label request flow process:
Step 400:new MME determines that UE is attached to this locality by old MME conversion.
In this process, UE need send the Attach Request message that carries GUTI to new MME, and new MME can determine old MME according to this GUTI, and initiates the identify label request flow process for UE to old MME.
Step 410:new MME sends in order to obtain the identify label relevant information Identification Request message of UE to old MME, carries udp port No. the first that new MME distributes in this Identification Request message.
In practical application, related protocol regulation: when sending Identification Request message, the destination slogan (also referred to as purpose udp port number) of the UDP floor that MME distributes is fixed as 2123, therefore, preferably, in step 410, it can be source udp port number that new MME gives first udp port number of the local Identification Request distribution of messages sent, accordingly, above-mentioned table 1 can be regarded as the mapping relations between each source udp port number and each processing unit.
The Identification Response message of the identify label relevant information of carrying UE that step 420:new MME reception old MME returns, carry udp port No. the second in this Identification Response message.
In practical application, old MME is when returning to Identification Response message, the source udp port number that needs to be carried in Identification Request message is inverted with purpose udp port number, be about to source udp port in Identification Request message number as the purpose udp port number in Identification Response message, and using purpose udp port in Identification Request message the source udp port number number in Identification Response message, therefore, in step 420, preferably, entrained the second udp port number of Identification Response message that MME reception old MME returns can be purpose udp port number.
The first udp port that step 430:new MME will obtain number compares with the second udp port number, while confirming that both mate, Identification Response message is sent to the processing unit that corresponding the first udp port number arranges and is resolved, to obtain the identify label relevant information of the UE that this message carries.
In the present embodiment, new MME determines the purpose udp port number that the Identification Response message of reception is carried, the source udp port that the Identification Request message that forward direction old MME sends is with it carried number coupling, identical, Identification Response message is sent to the processing unit that corresponding above-mentioned source udp port number arranges and is resolved, to obtain the identify label relevant information of the UE that this message carries.
In the above-described embodiments, when new MME is sent to the Identification Response message of reception processing unit that corresponding source udp port number arranges and is resolved, need first the storing sub-units 320 to appointment in this processing unit by its buffer memory, this is because Identification Response message is the message of NAC layer, be carried on S1-AP layer message and transmit, therefore, new MME is after receiving Identification Response message, should be by its buffer memory to corresponding storing sub-units 320, then, first treatment S 1-AP layer message, process again the Identification Response message of NAC layer.Because new MME can carry out alternately with a plurality of old MME simultaneously, and there are a plurality of processing units on new MME, so, a processing unit can be processed the Identification Response message of a plurality of old MME, and processing unit also can be processed a plurality of Identification Response message of an old MME, therefore, new MME need to carry out the corresponding storing sub-units 320 of a certain Identification Response of unique differentiation message with storaging mark number.
In the present embodiment, also further carry storaging mark number in Identification Response message, so-called storaging mark number, at least comprise queue number and SN(sequence number, sequence number), wherein, queue number is in order to unique identification one old MME, preferably, the IP address that should comprise new MME in queue number, the IP port numbers, the IP address of old MME, and SN is in order to mate Identification Request message and Identification Response message, be all should fill in consistent SN in the GTP protocol header of Identification Request message and Identification Response message, so that coupling.For example, consult shown in table 2, preferably, storaging mark number be set to following form:
Table 2
As shown in table 2, because the highest bit of storaging mark number is special purpose, at 22bit, to queue number is set between N bit, and between 0bit, SN is set at N bit.
On the S10 interface, except identify label request flow process does not have distribution T EID, other flow processs have all been distributed TEID, therefore, in identify label request flow process, new MME need to be by the mapping relations between default storaging mark number and storing sub-units 320, determine the corresponding storing sub-units 320 of Identification Response message, consult shown in table 3, on new MME, the mapping relations between the storaging mark arranged for certain old MME number and storing sub-units 320 are as follows:
Table 3
Preferably, mapping relations shown in table 3 dynamically update, during to be new MME send the process of Identification Request message to a certain old MME (can be send before, after also can sending), under the queue number of this old MME, the address of the SN of distribution and corresponding storing sub-units 320 is write in table, and new MME receive in the process of the Identification Response message that above-mentioned old MME returns (can be resolve before, can be also resolve after), the address of the SN that distributed and corresponding storing sub-units 320 is deleted from table.
Mapping relations based on shown in table 3, in the embodiment of the present invention, the processing unit that new MME is sent to number setting of corresponding source udp port by Identification Response message is resolved, when obtaining the identify label relevant information of described UE, should first determine Identification Response message stores identification number, again by Identification Response message buffering in above-mentioned processing unit in the storing sub-units 320 should storaging mark number arranged, make processing unit read Identification Response message and resolve from this storing sub-units 320, to obtain corresponding identify label relevant information, wherein, new MME by Identification Response message buffering in above-mentioned processing unit during to the storing sub-units 320 that should storaging mark number arranges, the queue number first comprised according to storaging mark number, confirm the memory space that this queue number is corresponding, then, in above-mentioned memory space, the sequence number comprised according to above-mentioned storaging mark number, obtain the address of the storing sub-units 320 to should sequence number preserving, finally, according to the address of the storing sub-units 320 obtained, by the corresponding storing sub-units 320 of Identification Response message buffering.
Consult shown in Fig. 5, below with a concrete example, above-mentioned flow process is described.
Step 500:new MME is by the message received, and the purpose udp port number carried according to it is distributed to corresponding processing unit, hereinafter referred to as processing unit 1
Whether is the message that processing unit 1 judgement in step 510:new MME receives the reply message in identify label request flow process, is Identification Response message? if, row step 520 in the time of; Otherwise, carry out step 540.
The storaging mark number that processing unit 1 in step 520:new MME carries according to Identification Response message, first find the memory space that the queue number in should storaging mark number is arranged, then, in this memory space, find the address of the storing sub-units 320 that the SN in corresponding above-mentioned storaging mark number arranges, finally, by Identification Response message buffering in above-mentioned storing sub-units 320.
Read the Identification Response message of buffer memory in processing unit 1 in step 530:new MME and resolved, obtain the identify label relevant information of its UE carried.
Like this, new MME just can adopt the identify label relevant information of UE, completes UE adhering to from old MME to this locality.
The TEID that processing unit 1 in step 540:new MME carries according to the message received, find corresponding storing sub-units 320 and carry out buffer memory and process.
In practical application, non-identify label request flow process, new MME all can distribution T EID, and therefore, the TEID that newMME only need to carry according to message, find corresponding storing sub-units 320 and carry out buffer memory and resolve getting final product.
In sum, in the embodiment of the present invention, in the identify label request flow process of unallocated TEID, MME adopts udp port number to mate identify label request message and identify label response message, thereby determine that according to udp port number the identify label response message should be sent to which processing unit carries out subsequent treatment, like this, MME can obtain the identify label relevant information of the UE that the identify label response message carries in time, thereby guarantee the smooth execution of UE attachment flow, prevent interruption and the failure of UE attachment flow, guaranteed the overall performance of system.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. a method of obtaining user equipment (UE) identify label relevant information, is characterized in that, comprising:
Determine that UE is attached to this locality by a mobile management entity MME conversion;
Send the identify label request message of the identify label relevant information in order to obtain UE to described MME, carry the local first user data pack protocol udp port number distributed in this identify label request message;
Receive the identify label response message of the identify label relevant information of carrying UE that described MME returns, in this identify label response message, carry udp port No. the second;
Described the first udp port number is compared with the second udp port number, while confirming that both mate, the processing unit that described identify label response message is sent to number setting of corresponding described the first udp port is resolved, to obtain the identify label relevant information of described UE.
2. the method for claim 1, is characterized in that, the processing unit that described identify label response message is sent to number setting of corresponding described the first udp port is resolved, and to obtain the identify label relevant information of described UE, comprising:
Further determine the storaging mark number that described identify label response message carries, this storaging mark number at least comprises to identify the queue number of described MME, and in order to mate the sequence number of described identify label request message and identify label response message;
The storing sub-units that described identify label response message buffer memory is arranged to corresponding described storaging mark in described processing unit number, make described processing unit read described identify label response message from described storing sub-units and resolved, to obtain corresponding identify label relevant information.
3. method as claimed in claim 2, is characterized in that, described identify label response message buffer memory, to the storing sub-units that corresponding described storaging mark in described processing unit number arranges, being comprised:
The queue number comprised according to described storaging mark number, confirm the memory space that this queue number is corresponding;
In described memory space, the sequence number comprised according to described storaging mark number, the address that obtains the storing sub-units to should sequence number preserving;
According to the address of described storing sub-units, by described identify label response message buffer memory to described storing sub-units.
4. method as claimed in claim 2 or claim 3, it is characterized in that, in the process that sends described identify label request message, generate the mapping relations between storaging mark number and storing sub-units, and, in the process that receives corresponding identify label response message, delete the mapping relations between storaging mark number and storing sub-units.
5. a device that obtains user equipment (UE) identify label relevant information, is characterized in that, comprising:
Communication unit, for when definite UE is attached to this locality by a mobile management entity MME conversion, send the identify label request message of the identify label relevant information in order to obtain UE to described MME, carry the local first user data pack protocol udp port number distributed in this identify label request message, and the identify label response message that receives the identify label relevant information of carrying UE that described MME returns, carry udp port No. the second in this identify label response message;
Dispatching Unit, for described the first udp port number is compared with the second udp port number, while confirming that both mate, be sent to by described identify label response message the processing unit that corresponding described the first udp port number arranges;
Processing unit, resolved for the identify label response message to receiving, to obtain the identify label relevant information of described UE.
6. device as claimed in claim 5, is characterized in that, described processing unit is resolved the identify label response message received, and to obtain the identify label relevant information of described UE, comprising:
Described processing unit is further determined the storaging mark number that described identify label response message carries, this storaging mark number at least comprises to identify the queue number of described MME, and in order to mate the sequence number of described identify label request message and identify label response message;
Described processing unit arranges described identify label response message buffer memory storing sub-units to corresponding described storaging mark in this processing unit number, and read described identify label response message from described storing sub-units and resolved, to obtain corresponding identify label relevant information.
7. device as claimed in claim 6, is characterized in that, described processing unit to the storing sub-units that corresponding described storaging mark in this processing unit number arranges, comprises described identify label response message buffer memory:
The queue number that described processing unit comprises according to described storaging mark number, confirm the memory space that this queue number is corresponding;
Described processing unit in described memory space, the sequence number comprised according to described storaging mark number, the address that obtains the storing sub-units to should sequence number preserving;
Described processing unit is according to the address of described storing sub-units, by described identify label response message buffer memory to described storing sub-units.
8. device as described as claim 6 or 7, it is characterized in that, at described communication unit, send in the process of described identify label request message, described Dispatching Unit generates the mapping relations between storaging mark number and storing sub-units, and, at described communication unit, receive in the process of corresponding identify label response message, described Dispatching Unit is deleted the mapping relations between storaging mark number and storing sub-units.
9. a mobile management entity MME, is characterized in that, comprises the described device of claim 5-8 any one.
10. the device that user equipment (UE) identify label relevant information is provided, is characterized in that, comprising:
Receiving element, the identify label request message in order to the identify label relevant information of obtaining UE for receiving that a mobile management entity MME sends, carry the first user data pack protocol udp port number that described MME distributes in this identify label request message;
Transmitting element, in order to return to the identify label response message of the identify label relevant information of carrying UE to described MME, carry udp port No. the second in this identify label response message, wherein, described the second udp port number meets default matching relationship, described matching relationship is for when described the second udp port number mates with described the first udp port number, the processing unit that described MME is sent to number setting of corresponding described the first udp port by described identify label response message is resolved, to obtain the identify label relevant information of described UE.
11. a mobile management entity MME, is characterized in that, comprises device as claimed in claim 10.
12. a communication system, user equipment (UE) is attached to target MME by source Mobility Management Entity MME, it is characterized in that, wherein,
Target MME, for when definite UE is attached to this locality by a source MME conversion, send the identify label request message of the identify label relevant information in order to obtain UE to described source MME, carry the local first user data pack protocol udp port number distributed in this identify label request message, and the identify label response message that receives the identify label relevant information of carrying UE that described source MME returns, carry udp port No. the second in this identify label response message, and described the first udp port number is compared with the second udp port number, while confirming that both mate, the processing unit that described identify label response message is sent to number setting of corresponding described the first udp port is resolved, to obtain the identify label relevant information of described UE,
Source MME, the identify label request message in order to the identify label relevant information of obtaining UE sent for receiving target MME, carry the first user data pack protocol udp port number that described target MME distributes in this identify label request message, and the identify label response message that returns to the identify label relevant information of carrying UE to described target MME, carry udp port No. the second in this identify label response message.
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