CN101340720B - Method for user terminal two stage position management by IP multimedia sub-system - Google Patents
Method for user terminal two stage position management by IP multimedia sub-system Download PDFInfo
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- CN101340720B CN101340720B CN2008101181992A CN200810118199A CN101340720B CN 101340720 B CN101340720 B CN 101340720B CN 2008101181992 A CN2008101181992 A CN 2008101181992A CN 200810118199 A CN200810118199 A CN 200810118199A CN 101340720 B CN101340720 B CN 101340720B
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Abstract
The invention provides a method used for leading an IP multimedia sub-system to carry out two-step position management on a user end (UE); the position management of UE is carried out by a two-step position management mechanism TTLM method where home network and visit network are respectively registered; the register of the visit network is used for carrying out the position management on the registered UE which is arranged in the visit network; when the UE roams, the visit network determines whether to trigger the register process of the home network according to the change situation of the IP address of the UE, thus reducing the signalling load of the IMS network. Furthermore, when the UE roams from the home network to the visit network and call-in or call-out conversation IOS event occurs, the method of the invention adopts a two-step position management mechanism TTLM method and a dynamic position updating mechanism DLU method to carry out the position management on the UE. The method of the invention solves the defects of the prior art better, effectively reduces the load of the HSS and S-CSCF, reduces the transmission quantity of the position updating signals, and improves the utilization ratio of the network resource.
Description
Technical field
The present invention relates to a kind of IP Multimedia System that is used for user terminal is carried out the method for two stage position management, belong to the mobile communication technology field.
Background technology
Universal mobile telecommunications system UMTS (Universal Mobile Telecommunications system) is one of main standard of 3G (Third Generation) Moblie, in the UMTS system, the purpose of introducing IP Multimedia System IMS (IP Multimedia subsystem) is that multimedia services such as voice, video, data are provided to mobile phone users, the core net unification on the network configuration of all-IP, and is realized fusion fixing, mobile communications network.
Location management is one of key technology of IMS network.In the IMS network, location management mainly is by the binding relationship between the IP address of the public user identity that generates the registered user based on the REGISTER request message of SIP in service call conversation control function S-CSCF (the Serving-Call Session Control Function) server and user terminal UE (User Equipment), and upgrades this binding relationship by weight registration process (Re-Registration).Heavy registration process makes position and the state that the IMS network can " perception " user UE, and request or the related service request from other users just can be routed to this registered user by the S-CSCF server like this.The binding time length of public user identity and UE IP address is then specified by the set registration timer RT of the expires parameter of Contact in the REGISTER message (registration timer).
There are two kinds heavy registration processes among the IMS: periodicity emphasis registration PRR (Periodic Re-Registration) and the heavily registration CCRR (Change CapabilitiesRe-Registration) that causes because of user terminal UE capacity variation.Wherein PRR is overtime in order to prevent the set registration timer of expires parameter value, periodically initiates register requirement by user terminal UE, upgrades the registration timer of network side.The CCRR process is because of the change of user terminal UE ability or because of roaming has changed the Access Network entrance, needs to initiate heavy registration process, can refresh the registration timer of network side equally.As can be seen: the purpose of CCRR process is when and where notice IMS network user terminals UE has changed position and ability, and the purpose of PRR process whether be the IMS network be used for surveying user terminal UE normally at net.The PRR process can allow network cycle know whether the login state of user terminal UE is effective, prevents that the user terminal UE under abnormal conditions from sending conversation request and wasting Internet resources.But frequent PRR process is easy to network is produced bigger load pressure, influences the systematic function and the capacity of network.
But, at present existing this registration and heavy logon mode make the core network element in the home network, and for example home subscriber server HSS (Home Subscriber Server) and S-CSCF server all need to participate in each location registration procedure and position enquiring process.Along with the expansion of userbase and the increase of call business amount, the load meeting of HSS server and S-CSCF server is more and more heavier, and more position is upgraded signaling and also can be taken the network bandwidth and handle resource, and professional meetings such as real-time calling are produced severe bad influence.Simultaneously, heavy registration process still needs all the IMS network elements on the registered paths to participate in into, causes network resource utilization very low, and mobile management is underaction also.Therefore the problem that how to reduce user terminal location management in the IP Multimedia System has become one of design difficulty of universal mobile telecommunications system and future network, also is the focus paid close attention to of scientific and technical personnel in the industry.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of IP Multimedia System carries out two stage position management to user terminal method that is used for, this method can solve preferably the network load that prior art exists big, influence the performance of network system and the defective of capacity, can reduce the load of HSS and two servers of S-CSCF effectively, reduce the transmission quantity that signaling is upgraded in the position, improve network resource utilization.
In order to achieve the above object, the invention provides a kind of IP Multimedia System that is used for user terminal is carried out the method for two stage position management, it is characterized in that: adopt the method for the secondary location management mechanism TTLM (two-tier location management mechanism) that home network and visited network register respectively that user terminal UE is carried out location management: the registration of visited network is to be responsible for the registered users that is positioned at this visited network is carried out location management; When user terminal was roamed, visited network determined whether triggering the home network registration process according to the situation of change of the IP address of user terminal UE, thereby reduced the signaling traffic load of IMS network; This method comprises following operating procedure:
(1) the network site management with IP Multimedia System IMS logically is divided into the two-stage administrative mechanism: the Proxy Call Session Control Function server P-CSCF at visited network registers, and registers respectively at the service call conversation control function server S-CSCF and the home subscriber server HSS of home network;
(2) in the registration process of visited network, the P-CSCF server of visited network is responsible for the registered user terminal UE in its Access Network is carried out location management: promptly the IP address of the user terminal UE that preserves in the P-CSCF server to visited network is upgraded;
(3) in the registration process of the S-CSCF of home network server, P-CSCF server by the visited network at the current place of user triggers, when the P-CSCF of this visited network server receives that user terminal UE moves to other Access Networks or when preventing the overtime heavy register requirement of sending of registration period, the P-CSCF server of this visited network will carry out matching ratio to the IP address information of this user terminal UE of the current IP address information of this user terminal UE and its preservation, judges whether both are identical; If both are inequality, order execution in step (4); Otherwise, redirect execution in step (5);
(4) the P-CSCF server of this visited network will upgrade the information that comprises IP address, Security Association, registration timer of this user terminal UE, and the IMS system upgrades the information that comprises Security Association, registration timer RT of this user terminal UE in the user attaching network simultaneously; Redirect execution in step (6);
(5) the P-CSCF server of this visited network only upgrades Security Association and the registration timer RT relevant with this user terminal UE, and the S-CSCF server and the HSS server of home network are not done any renewal;
(6) the S-CSCF server of home network is no longer preserved the IP address of this user terminal UE, and in going into calling procedure, the S-CSCF server of this home network is according to the address information of the P-CSCF server of each visited network of its preservation, route calls to the inlet P-CSCF server of paged this user terminal UE, make this inlet P-CSCF server can find this user terminal UE.
With respect to present location management mode, the present invention is used for IP Multimedia System can be limited in the location update operations of user terminal the visited network of IMS system to the method that user terminal carries out two stage position management as far as possible, thereby has avoided that user terminal consumes the home network resource too much in each renewal process.And secondary position management method of the present invention is changed less to the system specifications of existing IMS network, and original session route among the IMS and main flow process thereof are not all had to change, and does not also increase new signaling, and it is less therefore to implement difficulty, applies easily.
In addition, when the present invention is roamed into the visit net and is gone into to exhale or go out to exhale session IOS incident by home network at user terminal UE, adopt the method for secondary location management mechanism TTLM of the present invention and dynamic position update mechanism DLU (separate case is applied for a patent) simultaneously, user terminal is carried out location management.Dynamic position update mechanism DLU wherein, different with currently used periodicity emphasis registration PRR and the heavily registration CCRR method that causes because of user terminal UE capacity variation, it introduces position updating process with user's session behavior, thereby reduce the frequency and the network processes cost of periodic location update request, and, because dynamic position update mechanism DLU has just increased the operation requirement to registration timer RT in conversation procedure, the change workload of the network entity that relates to is very little, do not change critical workflows such as conversation procedure in the IMS system and registration process, can the system framework and the ways of services supplied of IMS network do not impacted yet, more do not have influence on the characteristic of network, so this method has good actual application value to the user terminal location management.
Description of drawings
Fig. 1 is that the present invention is used for IP Multimedia System carries out the method for two stage position management to user terminal operating procedure flow diagram.
Fig. 2 (A), (B) are respectively that the present invention is used for IP Multimedia System the operating process sequential chart is heavily registered in the transformation that user terminal carries out two embodiment of method of two stage position management.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is that a kind of IP Multimedia System that is used for carries out the method for two stage position management to user terminal, and it is that the secondary location management mechanism TTLM (two-tier location management mechanism) that location management with the IMS network is divided into visited network registration process and home network registration process carries out location management to user terminal UE: the registration of visited network is to be responsible for the registered users that is positioned at this visited network is carried out location management; When user terminal is roamed, visited network determines whether triggering the home network registration process of this user terminal UE according to the situation of change of the IP address of user terminal UE, this method can reduce the signaling traffic load of IMS network, and state information record improved, but to the system framework and the not influence of ways of services supplied of existing IMS network.
Referring to Fig. 1, introduce the following operating procedure of the inventive method:
(1) the network site management with IP Multimedia System IMS logically is divided into the two-stage administrative mechanism: register respectively respectively in the Proxy Call Session Control Function server P-CSCF of visited network registration, and at the service call conversation control function server S-CSCF and the home subscriber server HSS of home network;
(2) in the registration process of visited network, the P-CSCF server of visited network is responsible for the registered user terminal UE in its Access Network (as GRPS etc.) is carried out location management: promptly the IP address of the user terminal UE that preserves in the P-CSCF server to visited network is upgraded;
(3) in the registration process of the S-CSCF of home network server, P-CSCF server by the visited network at the current place of user triggers, when the P-CSCF of this visited network server receives that user terminal UE moves to other Access Networks or when preventing the overtime heavy register requirement of sending of registration period, the P-CSCF server of this visited network will carry out matching ratio to the IP address information of this user terminal UE of the current IP address information of this user terminal UE and its preservation, judges whether both are identical; If both are inequality, order execution in step (4); Otherwise, redirect execution in step (5);
(4) the P-CSCF server of this visited network will upgrade the information that comprises IP address, Security Association, registration timer of this user terminal UE, and the IMS system upgrades the information that comprises Security Association, registration timer RT of this user terminal UE in the user attaching network simultaneously; Redirect execution in step (6);
(5) the P-CSCF server of this visited network only upgrades Security Association and the registration timer RT relevant with this user terminal UE, and the S-CSCF server and the HSS server of home network are not done any renewal;
(6) the S-CSCF server of home network is no longer preserved the IP address of this user terminal UE, and in going into calling procedure, the S-CSCF server of this home network is according to the address information of the P-CSCF server of each visited network of its preservation, route calls to the inlet P-CSCF server of paged this user terminal UE, make this inlet P-CSCF server can find this user terminal UE.
When the present invention is roamed into the visit net and gone into to exhale or go out to exhale session IOS incident by home network at user terminal UE, can adopt the method for secondary location management mechanism TTLM and dynamic position update mechanism DLU that user terminal is carried out location management simultaneously.Promptly this moment, the inventive method further comprised following operating procedure:
(7) when going into to exhale or going out to exhale session IOS incident (being that the IMS network has been received conversation request that conversation request that UE initiates or UE have received that the IMS network sends and the incident of successful respond), the IMS network is carried out following content of operation:
Receive the conversation request of UE when the IMS network after, the registration timer RT of IMS network reseting network side; Receive the response of IMS network side as this UE after, the registration timer RT of reseting terminal side; Or
When the conversation request of IMS network side transmission arrives UE, this UE reseting terminal side registration timer RT; Receive the response of this UE when the IMS network after, reseting network side registration timer RT; Or
(8) do not go into to exhale or go out to exhale session IOS incident if having in the generation step (7), but because the CCRR incident of heavily registering that the capacity variation of UE causes takes place or during the heavily registration PRR incident of generating period, the IMS network is carried out following content of operation: UE and is initiated heavy register requirement, after the IMS network is received this heavy register requirement, reseting network side registration timer RT; After this UE receives the response that the IMS network returns, reseting terminal side registration timer RT, once complete flow process finishes.
Referring to Fig. 2, to introduce among the embodiment of TTLM method of the present invention, the location management flow process sequential of IMS system is specific as follows:
(1) under the unregistered situation of user terminal, the register flow path first of user terminal is identical with location registration procedure (being the standards registration process CR described in the international norm 3GPP TS 23.228) in the present IMS network; But after the registration, the state information that the S-CSCF server is preserved no longer comprises the IP address of UE, and other each entity status informations are all identical with the description among the international norm 3GPP TS 23.228.
(2) if under the situation that user terminal has been registered, the register flow path of user terminal (divides two kinds of situations to investigate) as shown in Figure 2 at this moment:
When situation 1:UE did not move to new wireless zone, the IP address of this UE was constant, and this UE regularly registers to the P-CSCF of visited network server, shown in Fig. 2 (A);
When situation 2:UE moves to new wireless zone, after SGSN-spanning (Serving GPRS Support Node) service area, need to carry out registration process, then the P-CSCF server of visited network judges whether the IP address of this UE changes, if UE IP address is constant, then the position is upgraded and is finished by the P-CSCF server of this visited network, shown in Fig. 2 (A); If the IP address of UE changes, then the P-CSCF server of this visited network need be transmitted the home network S-CSCF server of register command to this UE, and promptly two servers P-CSCF and the S-CSCF state information of being preserved all needs to upgrade.
Owing to be heavy registration process, for the not change of home network S-CSCF server of this UE service, so this S-CSCF server need not upgrade the address information among the HSS, shown in Fig. 2 (B).
(3) route of the call signalling flow under the secondary location management mechanism can not change.
Therefore, adopt TTLM method of the present invention after, the state information comparable situation of its state information and standards registration process CR is as follows:
Need to prove, when the present invention is roamed into the visit net and gone into to exhale or go out to exhale session IOS incident by home network at user terminal UE, can adopt the method for secondary location management mechanism TTLM and dynamic position update mechanism DLU that user terminal is carried out location management simultaneously.
Owing to implemented dynamic position update mechanism DLU method, the location management flow process of IMS of the present invention system is described below:
(1) under the unregistered situation of user terminal, the register flow path first of user terminal is identical with location registration procedure (being the standards registration process CR described in the international norm 3GPP TS 23.228) in the present IMS network.
But after the registration, the state information that the S-CSCF server is preserved no longer comprises the IP address of UE, and other each entity status informations are all identical with the description among the international norm 3GPP TS 23.228.
(2) if under the situation that user terminal has been registered, the register flow path of user terminal is described below:
(A) receive UE conversation request (as SIP INVITE), the IMS network registration timer that resets; After UE receives IMS side response, the registration timer that resets (as 1XX etc.).IMS sends conversation request and arrives UE, the UE registration timer that resets; After IMS received the response of UE side, registration timer resetted; Or
(B) after the IMS network was received heavy register requirement (when CCRR and PCR situation take place), registration timer resetted; After UE received response, the timer that resets was described identical with standard procedure described in the international norm 3GPP TS 23.228.
(3) the P-CSCF server in the visited network, the S-CSCF in the home network, function network element entities such as HSS server all need the registration timer that resets.
The applicant proves that by the experimental demonstration of theoretical analysis in detail and emulation embodiment method of the present invention is effectively, can realize goal of the invention.
Claims (2)
1. one kind is used for IP Multimedia System user terminal is carried out the method for two stage position management, it is characterized in that: adopt the method for the secondary location management mechanism TTLM that home network and visited network register respectively that user terminal UE is carried out location management: the registration of visited network is to be responsible for the registered users that is positioned at this visited network is carried out location management; When user terminal was roamed, visited network determined whether triggering the home network registration process according to the situation of change of the IP address of user terminal UE, thereby reduced the signaling traffic load of IMS network; This method comprises following operating procedure:
(1) the network site management with IP Multimedia System IMS logically is divided into the two-stage administrative mechanism: the Proxy Call Session Control Function server P-CSCF at visited network registers, and registers respectively at the service call conversation control function server S-CSCF and the home subscriber server HSS of home network;
(2) in the registration process of visited network, the P-CSCF server of visited network is responsible for the registered user terminal UE in its Access Network is carried out location management: promptly the IP address of the user terminal UE that preserves in the P-CSCF server to visited network is upgraded;
(3) in the registration process of the S-CSCF of home network server, P-CSCF server by the visited network at the current place of user triggers, when the P-CSCF of this visited network server receives that user terminal UE moves to other Access Networks or when preventing the overtime heavy register requirement of sending of registration period, the P-CSCF server of this visited network will carry out matching ratio to the IP address information of this user terminal UE of the current IP address information of this user terminal UE and its preservation, judges whether both are identical; If both are inequality, order execution in step (4); Otherwise, redirect execution in step (5);
(4) the P-CSCF server of this visited network will upgrade the information that comprises IP address, Security Association, registration timer of this user terminal UE, and the IMS system upgrades the information that comprises Security Association, registration timer RT of this user terminal UE in the user attaching network simultaneously; Redirect execution in step (6);
(5) the P-CSCF server of this visited network only upgrades Security Association and the registration timer RT relevant with this user terminal UE, and the S-CSCF server and the HSS server of home network are not done any renewal;
(6) the S-CSCF server of home network is no longer preserved the IP address of this user terminal UE, and in going into calling procedure, the S-CSCF server of this home network is according to the address information of the P-CSCF server of each visited network of its preservation, route calls to the inlet P-CSCF server of paged this user terminal UE, make this inlet P-CSCF server can find this user terminal UE.
2. method according to claim 1, it is characterized in that: when user terminal UE is roamed into the visit net and gone into to exhale or go out to exhale session IOS incident by home network, adopt the method for secondary location management mechanism TTLM and dynamic position update mechanism DLU simultaneously, user terminal is carried out location management; Described method further comprises following operating procedure:
(7) when going into to exhale or going out to exhale session IOS incident, the IMS network is carried out following content of operation:
Receive the conversation request of user terminal UE when the IMS network after, the registration timer RT of IMS network reseting network side; After this user terminal UE receives the response of IMS network side, the registration timer RT of reseting terminal side; Or
When the conversation request of IMS network side transmission arrives user terminal UE, this user terminal UE reseting terminal side registration timer RT; Receive the response of this user terminal UE when the IMS network after, reseting network side registration timer RT; Or
(8) do not go into to exhale or go out to exhale session IOS incident if having in the generation step (7), but because the CCRR incident of heavily registering that the capacity variation of user terminal UE causes takes place or during the heavily registration PRR incident of generating period, the IMS network is carried out following content of operation: user terminal UE initiates heavy register requirement, after the IMS network is received this heavy register requirement, reseting network side registration timer RT; After this user terminal UE receives the response that the IMS network returns, reseting terminal side registration timer RT, flow process finishes.
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| CN2008101181992A CN101340720B (en) | 2008-08-14 | 2008-08-14 | Method for user terminal two stage position management by IP multimedia sub-system |
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| CN1984004A (en) * | 2006-04-20 | 2007-06-20 | 华为技术有限公司 | Method for accessing IMS network to mobile circuit domain user and its registering method |
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| CN1984004A (en) * | 2006-04-20 | 2007-06-20 | 华为技术有限公司 | Method for accessing IMS network to mobile circuit domain user and its registering method |
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