CN101409901A - Method and apparatus for implementing signaling reduction in idle state with boundary-striding of user equipment - Google Patents
Method and apparatus for implementing signaling reduction in idle state with boundary-striding of user equipment Download PDFInfo
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Abstract
The invention discloses a method for reducing signaling under an idle state when user equipment crosses a boundary. The method comprises the steps as follows: the user equipment is registered in a second network, when the user equipment moves to the second network under the idle state, after being registered in a first network; and an ISR mechanism is started, and SGSN stops a periodical route update timer of the user equipment. The invention also discloses a corresponding device which stops a periodical update timer of the user equipment in a network element by a message mechanism, thus solving the problem that UE is untouchable in the SGSN under the IDLE state when ISR function is adopted between 3G and LTE-SAE, due to the operation of the periodical route update timer in 3G, and simultaneously no operation of a periodical tracing area update timer in an LET-SAE system. The invention does not define a periodical TA update mechanism for coordinating, therefore, the whole mechanism is simpler and is easy to be realized.
Description
Technical field
The present invention relates to the mobile tracking technology of subscriber equipment, particularly a kind of method and device of realizing the signaling reduction under boundary-striding of user equipment spare time (IDLE) state.
Background technology
Introducing third generation partner program (3GPP, 3rd Generation Partnership Project) Long Term Evolution (LTE, Long Term Evolution) after the technology, because disposing, initial network generally will consider at large-scale 2G/3G global system for mobile communications/wireless universal communication interface (GSM/UTRA, GlobalSystem for Mobile Communications/Universal Telecommunication Radio Access) the improved UTRA (E-UTRA of partial deployment LTE on the network, Evolved Universal Telecommuni-cation Radio Access) network, therefore propose as subscriber equipment (UE, when User Equipment) frequently crossing over two kinds of access technology borders, upgrade caused signaling quantity because of trigger position in the time of should considering that a scheme is saved crossing the boundary, it is IDLE status signaling reduction (ISR, Idle state Signaling Reduction).
In the implementation of ISR, also one of open question is that 2G/3G side network can cycle of operation property Routing Area Update (PRAU, Periodic Routing Area Update).The 2G/3G network can start-up period routing update mechanism to the UE of IDLE state, and during PRAU timer expiry among the UE, UE sends the PRAU request to network, after network is accepted this PRAU request, and the PRAU timer of replacement network side.The PRAU timer of network side is longer than the time of the PRAU timer setting of UE, guarantees before the timer expiry of network side, and the timer of UE side is understood overtime earlier and triggered PRAU.If the timer expiry of UE side and do not trigger PRAU, the periodicity routing update timer expiry that makes the network side operation, network will be thought UE attachment removal (detach).
Existing minimizing 2G/3G and LTE/ System Architecture Evolution (SAE, System ArchitectureEvolution) moves the method that signaling is upgraded in caused position because of IDLE state UE between the network, its main thought is: with the Routing Area (RA at UE place in the 2G/3G network, Routing Area) equivalent RA (Equivalent RA) is regarded in the tracing area of registering in the LTE/SAE network with UE (TA, Tracking Area)/tracking area tabulation (TA-List) mutually as.And the characteristic that equivalent RA had comprises:
A, UE belong to the different bands of position with UE when the LTE/SAE sub-district when the 2G/3G sub-district, promptly the former belongs to RA, and the latter belongs to TA.
B, UE at first register in 2G/3G or LTE/SAE network, when it moves into the network of another access technology, equally to registers kernel network, and do not cancel previous registration.Be UE two registrations in two connecting systems.
C, in case finish registration or RA upgrades, UE is just accepted by a plurality of, equivalent RA.Typical example is a RA (belonging to the 2G/3G network) and a TA (belonging to the LTE/SAE network).UE is assigned with temporary mobile subscriber identity (P-TMSI, Temporary Mobile Subscriber Identity) in RA, and is assigned with S-TMSI in TA.
D, when the non-activated state of UE at LTE-IDLE attitude and UTRA between two networks when mobile, UE does not need to initiate the signaling that the position is upgraded to network, unless UE has entered the new band of position that does not belong to equivalent RA tabulation.
E, do not belong in the equivalent RA tabulation one when the lane place (RA/TA) at the place, new sub-district that UE enters, then UE should initiate common Routing Area Update (RAU, Routing Area Update)/tracing section updating (TAU, Tracking Area Update) process.
F, when UE during in state of activation between 2G/3G and LTE/SAE when mobile, UE and internetwork signaling should be able to guarantee the correct route of user data.
In the above scheme, how control cycle Routing Area Update timer is one of them key issue.After UE registered in 2G/3G and LTE/SAE network, a RA (among the 2G/3G) and at least one TA (among the LTE/SAE) formed an equivalent RA tabulation.Because of the UE for the IDLE state in the 2G/3G network is moving the PRAU timer, if this moment, UE was in an overlay area of waiting until at LTE/SAE before the timer expiry, UE will can not send PRAU message to SGSN, network will be thought UE attachment removal from 2G/3G behind the periodicity routing update timer expiry in the 2G/3G network, and UE will only be attached among the LTE/SAE; When UE returns the 2G/3G network, must re-execute and adhere to (attach) process, this also just shows the ISR disabler.
Therefore, how handling the PRAU timer in the 2G/3G network, is the problem of using a need solution of ISR mechanism.
Existing two kinds of technology can address the above problem, and all based on the same notion that adopts periodic location update in the LTE system, promptly periodically TA upgrades (PTAU, Periodic Routing Area Update):
1) Mobility Management Entity (MME, Mobility Management Entity) and based on stopping to define a kind of coordination function between the GPRS serving GPRS support node (SGSN, Serving General Packet Radio ServiceSupport Node).
When UE after the two registrations of 2G/3G and LTE/SAE network, need between MME and SGSN, set up a kind of coordination function, make contact that generation between two timers is certain or make this disabler.
But because the value of PRAU/PTAU timer all is identical by network settings for each UE, therefore the value at two timers of network facet coordination is relatively more difficult.
2) UE selects timer.
UE has obtained the value of the PRAU timer and the PTAU timer of two systems after second system registry, UE chooses a wherein less value, initiates the timer value of PRAU and PTAU as oneself.When UE initiates PRAU or PTAU in current system, the core network element SGSN/MME that handles this process will send message to another core network element MME/SGSN that carries out same ISR function, inform that UE has carried out RA or TA and upgraded, require the UE of another network element replacement network side to periodically update timer.This method is easily fairly simple, but prerequisite is also to need to introduce the notion that periodically updates in LTE.If do not have among the LTE to introduce the notion that periodically updates, this method has just lost meaning.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and the device of signaling reduction under the IDLE state when realizing that subscriber equipment is cross-border, the renewal signaling when this method can reduce the subscriber equipment crossing the boundary.
For achieving the above object, technical scheme of the present invention is achieved in that
The not busy status signaling reduction method of a kind of realization boundary-striding of user equipment is applicable to the processing of periodical position renewing timer in the periodic location update network, and this method may further comprise the steps:
After A, subscriber equipment are registered in first network, when described subscriber equipment when idle condition moves to second network, described subscriber equipment is registered in second network;
B, first network element and second network element start ISR mechanism, and SGSN stops the periodicity routing update timer of described subscriber equipment.
Described first network is wireless universal access network UTRAN, and first network element is SGSN; Second network is evolved universal Radio Access Network E-UTRAN, and second network element is a mobile management entity MME;
Step B further comprises:
B11, MME send indication to SGSN, start the ISR mechanism between MME and the SGSN;
B21, SGSN stop the periodicity routing update timer of described subscriber equipment.
Described first network is EUTRAN, and first network element is MME; Second network is UTRAN, and second network element is SGSN;
Step B further comprises:
B21, subscriber equipment send the message of Routing Area Update to SGSN, and SGSN sends message to MME, starts ISR mechanism;
B22, MME send indication to SGSN, and SGSN stops the periodicity routing update timer of described subscriber equipment.
Among the step B21, MME sends the ISR indication to SGSN in the request customer equipment context message of returning.
This method also comprises: subscriber equipment leaves current equivalent route district scope, and MME indicates notice SGSN with the subscriber equipment attachment removal according to the ISR function.
The described current equivalent route district of leaving is: heavily distribute the route district by the tracking area tabulation for described subscriber equipment.
A kind of device of realizing signaling reduction in idle state with boundary-striding of user equipment, this device comprises:
The timing control module is arranged in SGSN, sends the message of dwelling period routing update timer timing to the timing command execution module;
The timing command execution module is arranged in SGSN, receives the message of timing control module, sends to periodicity routing update timer to stop the timing order, and execution result is returned the timing control module;
The ISR module is arranged in MME, is used for sending the ISR indication to the timing control module.
This device also comprises the attachment removal module, according to the order of timing control module, will leave subscriber equipment attachment removal in SGSN in current equivalent route district.
The method and the device of signaling reduction under the IDLE state when realization subscriber equipment provided by the present invention is cross-border, be applicable to the periodically system of TA update mechanism that do not adopt, indication according to the coordination system of being set up between MME and the SGSN and ISR message, after SGSN receives indication, stop the operation of PRAU timer in the 3G system, thereby solve when adopting the ISR function between 3G and the LTE/SAE, under the IDLE state that may cause because of the operation of periodicity routing update timer, UE is in the untouchable problem of SGSN.The present invention no longer delimiting period TA update mechanism coordinates, make whole mechanism more simple, be easy to realize.
Description of drawings
Fig. 1 is the schematic network structure of one embodiment of the invention;
Fig. 2 is the flow chart of one embodiment of the invention;
Fig. 3 is the composition structural representation of apparatus of the present invention.
Embodiment
Main thought of the present invention is: when the UE of IDLE state crosses over the border of first network and second network, by the ISR message mechanism, the PRAU timer among the SGSN was lost efficacy.This method is a more feasible method for do not adopt the periodically system of TA update mechanism in the LTE/SAE system.The realization principle of this method is: after the two registrations of UE, keep the IDLE state in previous system, its context is not deleted.When UE crosses over the border of two networks,, therefore can guarantee that UE can be labeled as unreachable because periodically updating timer expiry by network in the ordinary course of things because UE stops the operation of timer in original system.
Here, first network can be the UTRAN among the 2G/3G, and corresponding second network is the E-UTRAN under the LTE/SAE; Perhaps, first network is the E-UTRAN under the LTE/SAE, and second network is the UTRAN among the 2G/3G.Be UTRAN with first network below, second network is that E-UTRAN is an example, specifies the flow process of the method for the invention.
As shown in Figure 1, the UE under the IDLE state at first registers in SGSN, has entered the control range of MME afterwards, and because of entering the new band of position, UE sends TAU message to MME, requires to be registered to the LTE network.When the reposition of UE at home subscriber server (HSS, Home Subscriber Server) after successfully registering in, MME sends message to SGSN, notice SGSN stops the operation that it is kept at the PRAU timer among the UE Context, but other is provided with all and does not change, such as not removing paging sign (PPF, Paging ProceedFlag).
Since the PRAU timer stop use with ISR mechanism, when UE gets back among the UTRAN at the IDLE state, also can not trigger the operation of PRAU timer once more.Detailed process is as shown in Figure 2:
Step 1:UE selects a UTRAN sub-district, and UE sends the RAU request message to SGSN.
Here, the selected sub-district of UE is the sub-district that the RA at place does not also register in network.
Carry out security functions processes such as authentication and encryption between step 2:UE and SGSN and the HSS.
Step 3:SGSN and gateway (Serving GW, Serving Gateway) and Serving GW and (the PDN GW of Packet Data Network, Packet Data Network Gateway) carry out bearer update between, such as: the mode that is used to charge is upgraded etc.
Step 4:SGSN sends location update message to HSS, and requiring HSS registration SGSN is the UE current location.
Step 5:HSS deletes the positional information of UE in original network, and returns the renewal (Update Location Ack) of relevant position information to SGSN.If HSS has refused RAU in this message, then SGSN will refuse the RAU request of UE, finish current handling process;
If HSS has accepted RAU, enter step 6.If carried the CAMEL-Subscription-Information of UE in Update Location Ack message, then SGSN need return a position renewal and finish message (Update LocationComplete).
Step 6: confirm that UE inserts successfully, SGSN sends the message of accepting RAU to UE, wherein may comprise newly assigned P-TMSI.If P-TMSI has changed, UE should return to SGSN and finish RAU message and confirm.
Step 7:UE enters a new sub-district and finds to enter a new TA.
Step 8:UE sends the TAU request, initiates the TAU process.
Step 9:eNodeB sends to MME with TAU request and other necessary information.
Step 10:MME sends context request to SGSN, to obtain the context of UE.
Step 11:SGSN returns the UE context, comprises authentication, bearing parameter, Serving GW address and Tunnel End Point Identifier (TEID, Tunnel Endpoint Identifier).
Carry out security functions such as authentication, authentication between step 12:UE and MME and the HSS.
Step 13:MME acknowledges receipt of the context of UE to SGSN.
Step 14: the context of the UE that returns according to the SGSN that receives in the step 11, mobile management (the MM of MME structure UE, Mobility Management) context, and send request to Serving GW and set up bearer messages (Create Bearer Request).
Step 15:Serving GW sends to PDN GW and requires to upgrade bearer context information such as (Update BearerRequest).
Step 16:PDN GW upgrades bearer context and returns bearer update message (Update BearerResponse).Afterwards, Serving GW promptly can be routed to PDN GW with the grouped data renewal (PDU) of receiving from eNodeB.
Step 17:Serving GW returns to MME and sets up bearer messages (Create Bearer Response).
Step 18:MME sends to HSS and upgrades lane place message (Update Location), requires to upgrade the log-on message among the HSS.Because of comprising the indication whether MME and previous SGSN exist the ISR function in the message, HSS will can not send cancel location message to SGSN.
Step 19:HSS is to MME home position updating message Update LocationAck.If transmitted the subscription data of UE in UpdateLocation Ack message, then MME need return completing place updating message (Update Location Complete) to HSS, to acknowledge receipt subscription data.
Step 20:MME sends TAU to UE, accepts the TA update request of UE.If MME has redistributed S-TMSI to UE, then UE sends TAU Complete, to acknowledge receipt S-TMSI.
Step 21:MME sends ISR Notification message to SGSN, starts the ISR mechanism between SGSN and the MME, and requires SGSN to carry out corresponding coordination function, requires SGSN to stop the PRAU timer.
Step 22:SGSN stops the operation of the PRAU timer of UE, and returns ISR acknowledge message (ISRConfirmation), and timer stops.
Step 21 also can transmit relevant parameter by other signaling procedure between SGSN and MME in realization, SGSN is interpreted as stop the PRAU timer to get final product.
When the UE of IDLE state at first registers in MME, by having moved into the control range of SGSN, this moment, UE sent RAU message to SGSN because of entering new lane place afterwards, and requirement is registered to 3G network.Because of periodic update mechanism not in the LTE/SAE system, after SGSN obtains information that ISR mechanism starts, and after the message of receiving the renewal positional information success that HSS sends, stop the PRAU timer of UE.Otherwise when UE after the IDLE state moves among the E-UTRAN, SGSN does not also know that UE has moved out the scope of oneself control, when UE did not get back to the control range of SGSN during at timer expiry, UE still can be judged to be unreachable by network.
When UE left current equivalent RA scope in the LTE system after, MME can notify SGSN with the UE attachment removal.When UE in LTE attachment removal took place, MME also can notify SGSN with the UE attachment removal.Here, UE leave current equivalent RA scope can tabulate by tracking area (TA-List) heavily distribute the route district to realize for UE.
When UE left current equivalent RA scope in the 3G system after, SGSN should notify MME with the UE attachment removal; UE can register in new RA simultaneously, carries out RA and upgrades, and this moment, the PRAU timer can rerun.
For realizing said method; The corresponding proposition of the present invention is a kind of when realizing that subscriber equipment the is cross-border device of signaling reduction under the IDLE state; As shown in Figure 3; It is the composition structure of device of the present invention in the frame of broken lines; This device comprises timing control module and the timing command execution module that is positioned at the SGSN side; And the ISR module that is positioned at the MME side; Wherein, The timing control module is connected the ISR module with the timing command execution module of SGSN side respectively and is connected with MME; The timing command execution module connects the periodicity routing update timer of UE among the SGSN; Specifically
The timing control module is used for the message to the timing of timing command execution module transmission dwelling period routing update timer;
The timing command execution module is used to receive the message of timing control module, sends to periodicity routing update timer to stop the timing order, and execution result is returned the timing control module.
The ISR module is used for sending the ISR indication to the timing control module.
Accordingly, the ISR module of timing control module from MME obtained the ISR indication.
This device also can further comprise the attachment removal module, is used for the order according to the timing control module, will leave subscriber equipment attachment removal in SGSN in current equivalent route district.
This timing command execution module can connect the periodicity routing update timer of a plurality of UE, according to the order of timing control module, stops the corresponding periodically operation of routing update timer.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (8)
1, the not busy status signaling reduction method of a kind of realization boundary-striding of user equipment is applicable to the processing of periodical position renewing timer in the periodic location update network, it is characterized in that this method may further comprise the steps:
After A, subscriber equipment are registered in first network, when described subscriber equipment when idle condition moves to second network, described subscriber equipment is registered in second network;
B, first network element and second network element start ISR mechanism, and SGSN stops the periodicity routing update timer of described subscriber equipment.
2, the method for realization signaling reduction in idle state with boundary-striding of user equipment according to claim 1 is characterized in that, described first network is wireless universal access network UTRAN, and first network element is SGSN; Second network is evolved universal Radio Access Network E-UTRAN, and second network element is a mobile management entity MME;
Step B further comprises:
B11, MME send indication to SGSN, start the ISR mechanism between MME and the SGSN;
B21, SGSN stop the periodicity routing update timer of described subscriber equipment.
3, the method for realization signaling reduction in idle state with boundary-striding of user equipment according to claim 1 is characterized in that, described first network is EUTRAN, and first network element is MME; Second network is UTRAN, and second network element is SGSN;
Step B further comprises:
B21, subscriber equipment send the message of Routing Area Update to SGSN, and SGSN sends message to MME, starts ISR mechanism;
B22, MME send indication to SGSN, and SGSN stops the periodicity routing update timer of described subscriber equipment.
4, the method for realization signaling reduction in idle state with boundary-striding of user equipment according to claim 3 is characterized in that, among the step B21, MME sends the ISR indication to SGSN in the request customer equipment context message of returning.
5, the method for realization signaling reduction in idle state with boundary-striding of user equipment according to claim 1, it is characterized in that, this method also comprises: subscriber equipment leaves current equivalent route district scope, and MME indicates notice SGSN with the subscriber equipment attachment removal according to the ISR function.
6, the method for realization signaling reduction in idle state with boundary-striding of user equipment according to claim 5 is characterized in that, the described current equivalent route district of leaving is: heavily distribute the route district by the tracking area tabulation for described subscriber equipment.
7, a kind of device of realizing signaling reduction in idle state with boundary-striding of user equipment is characterized in that, this device comprises:
The timing control module is arranged in SGSN, sends the message of dwelling period routing update timer timing to the timing command execution module;
The timing command execution module is arranged in SGSN, receives the message of timing control module, sends to periodicity routing update timer to stop the timing order, and execution result is returned the timing control module;
The ISR module is arranged in MME, is used for sending the ISR indication to the timing control module.
8, the device of realization signaling reduction in idle state with boundary-striding of user equipment according to claim 7, it is characterized in that, this device also comprises the attachment removal module, according to the order of timing control module, will leave subscriber equipment attachment removal in SGSN in current equivalent route district.
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