CN109962959B - Session binding method, device, equipment and medium - Google Patents

Session binding method, device, equipment and medium Download PDF

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Publication number
CN109962959B
CN109962959B CN201711431198.9A CN201711431198A CN109962959B CN 109962959 B CN109962959 B CN 109962959B CN 201711431198 A CN201711431198 A CN 201711431198A CN 109962959 B CN109962959 B CN 109962959B
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message
address
network element
src
session
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CN109962959A (en
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周晓飞
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China Mobile Communications Group Co Ltd
China Mobile Group Liaoning Co Ltd
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China Mobile Communications Group Co Ltd
China Mobile Group Liaoning Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/14—Charging, metering or billing arrangements for data wireline or wireless communications
    • H04L12/1403—Architecture for metering, charging or billing
    • H04L12/1407—Policy-and-charging control [PCC] architecture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/255—Maintenance or indexing of mapping tables
    • H04L61/2553—Binding renewal aspects, e.g. using keep-alive messages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/59—Network arrangements, protocols or services for addressing or naming using proxies for addressing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management

Abstract

The invention discloses a session binding method, a session binding device, session binding equipment and a session binding medium. The session binding method comprises the following steps: receiving a request message for activating an IMS APN initiated by an SAEGW network element through a Gx interface, selecting a PCRF network element with a policy and charging rules function, and generating a corresponding relation between a first IP address and a first PCRF network element; if the first PCRF network element does not respond within the preset time and the CCR-F message sent by the SAEGW network element is received, recording a first IP address carried in the CCR-F message, and triggering SRC-A message, wherein the SRC-A message carries the corresponding relation between the first IP address and the first PCRF network element; the SRC module caches the corresponding relation between the first IP address and the first PCRF network element; and if the session message related to the first IP address is received, triggering the corresponding SRC type message according to the session message. By adopting the invention, the IP address conflict caused by DRA identification message delay can be realized, the signaling is routed to the correct PCRF, and the failure of the Voice service is avoided.

Description

Session binding method, device, equipment and medium
Technical Field
The present invention relates to the field of LTE technologies, and in particular, to a session binding method, apparatus, device, and medium
Background
According to the current Routing Agent (DRA) specification, the mechanism of Gx/Rx interface session binding is as follows: the DRA records and stores the binding relationship between the IP address in the Framed-IPv6-Perfix and the PCRF address after routing the Gx interface signaling message of the IMS APN (IMS, IP Multimedia Subsystem, APN, Access Point Name) to a certain PCRF in the PCRF POOL in a load sharing way, synchronizes the information to another DRA in pair, receives the Rx interface signaling message sent by the VoSBC LTE (VoLTE session boundary controller), inquires the binding relationship record between the user IP address stored in the DRA and the PCRF according to the IP address in the AVP Framed-IPv6-Perfix carried by the Rx interface signaling message, and forwards the Rx interface signaling message to the corresponding PCRF. The prior art described above can be seen in fig. 1.
As shown in fig. 2, the DRA is used as a signaling transfer point, and is located at an important position in a 4G core network and a VOLTE high-definition voice IMS core network, so as to implement signaling message interaction between a user activated APN and a registered IMS network.
In the existing session binding mechanism, when signaling exception occurs in PCRF, no SAEGW CCA (System Architecture Evolution gateway, CCA, Credit Control Answer) message is replied in time, and since the SAEGW still does not receive CCA message after timer timeout, the user IMS APN activation request is rejected, the session is released, and the IP address allocated to the user is recovered. The IP address is allocated to another user by the SAEGW, so that the DRA forwards the Rx message sent from the SBC to the wrong PCRF based on the correspondence between the IP address and the PCRF according to the session binding mechanism, and the VOLTE service cannot be successfully performed.
In summary, how to enable the DRA to identify IP address conflicts caused by message delay and route signaling to a correct PCRF according to a session binding mechanism different from the specification, so as to avoid failure of the Volte service, becomes a technical problem to be solved urgently at present.
Disclosure of Invention
Embodiments of the present invention provide a session binding method, apparatus, device, and medium, which enable DRA to identify IP address conflicts caused by message delay, route signaling to a correct PCRF according to a session binding mechanism different from a specification, and avoid a voice service failure.
In a first aspect, an embodiment of the present invention provides a session binding method, which is used in a routing agent node DRA in an LTE system, where the DRA includes a session relation cache SRC module, and the method includes: receiving a request message for activating an IP multimedia subsystem access point name (IMS APN) initiated by a System Architecture Evolution Gateway (SAEGW) network element through a Gx interface, selecting a Policy and Charging Rules Function (PCRF) network element, and generating a forwarding corresponding relation between a first IP address and the first PCRF network element; if the first PCRF network element does not respond within the preset time and receives a CCR-F (CCR-Fault, credit control request error) message sent by the SAEGW network element, recording a first IP address carried in the CCR-F message and triggering an SRC-A message, wherein the SRC-A message carries the corresponding relation between the first IP address and the first PCRF network element; the SRC module caches the corresponding relation between the first IP address and the first PCRF network element; and if the session message related to the first IP address is received, triggering the corresponding SRC type message according to the session message.
In a second aspect, an embodiment of the present invention provides a session binding method, which is used in a System Architecture Evolution Gateway (SAEGW) network element in an LTE system, and the method includes: receiving a request message for activating an IP multimedia subsystem access point name (IMS APN) initiated by user equipment, and allocating a first IP address for the user equipment; sending a credit control request initial CCR-I message to a PCRF network element through a Gx interface, if a credit control response CCA message returned by the first PCRF network element is not received within a preset time, sending a credit control request error CCR-F message to a routing agent node DRA, and carrying a first IP address in the CCR-F message; if the CCA message is received within the preset time, initiating an IMS registration session message through an Rx interface; wherein the CCR-F message is used for indicating the failure of the CCR-I message request to the DRA.
In a third aspect, an embodiment of the present invention provides a session binding apparatus, which is used in a routing agent node DRA in an LTE system, where the DRA includes a session relation cache SRC module, and the apparatus includes: a receiving unit, configured to receive a request message for activating an IP multimedia subsystem access point name IMS APN initiated by a system architecture evolution gateway SAEGW network element through a Gx interface, select a policy and charging rules function PCRF network element, and generate a corresponding relationship between a first IP address and a first PCRF network element; the interaction unit is used for recording a first IP address carried in a CCR-F message and triggering a session relation cache to respond to an SRC-A message if the first PCRF network element does not respond within the preset time and the CCR-F message is received by a credit control request error sent by the SAEGW network element, wherein the SRC-A message carries the corresponding relation between the first IP address and the first PCRF network element; the cache unit is used for caching the corresponding relation between the first IP address and the first PCRF network element through the SRC module; and the interaction unit is further configured to trigger a corresponding SRC-like message according to the session message if the session message related to the first IP address is received.
In a fourth aspect, an embodiment of the present invention provides a session binding apparatus, which is used in a system architecture evolution gateway SAEGW network element in an LTE system, and the apparatus includes: a receiving unit, configured to receive a request message for activating an access point name IMS APN initiated by a user equipment, and allocate a first IP address to the user equipment; a sending unit, configured to send a credit control request initial CCR-I message to a PCRF through a Gx interface, and if a credit control response CCA message returned by the PCRF is not received within a preset time, send a credit control request error CCR-F message to a routing agent node DRA, where the CCR-F message carries a first IP address; if the CCA message is received within the preset time, initiating an IMS registration session message through an Rx interface; wherein the CCR-F message is used for indicating the failure of the CCR-I message request to the DRA.
An embodiment of the present invention provides a computer device, including: at least one processor, at least one memory, and computer program instructions stored in the memory, which when executed by the processor, implement the method as described in the first aspect of the embodiments above or the method as described in the second aspect of the embodiments above.
In a further aspect, embodiments of the present invention provide a computer-readable storage medium, on which computer program instructions are stored, which, when executed by a processor, implement the method according to the first aspect of the foregoing embodiments or the method according to the second aspect of the foregoing embodiments.
According to the Session binding method, device, equipment and medium provided by the embodiment of the invention, a SRC (Session translation Cache) module is additionally arranged in the DRA and is used for dynamically caching the corresponding Relation between the user IP address and the PCRF network element and linking with the SAEGW, DRA and PCRF, and after the IP address is redistributed due to signaling delay of the PCRF, the corresponding Relation between the IP address and the PCRF network element is cached without immediate modification, so that the DRA forwards the signaling to the correct PCRF, thereby avoiding the unavailability of service caused by failure of the VOLTE registration process and ensuring the success rate of VOLTE calling. Specifically, the SAEGW adds a function of sending a message CCR-F (CCR-Fault, credit control request error) to the DRA, and carries an Address in Framed-IP-Address AVP; SAEGW indicates that its CCR request has not been replied to within a specified time and that the corresponding address is to be assigned to another user. After receiving the CCR-F message of the SAEGW, the DRA learns that the address is to be released, and needs to trigger the signaling of the SRC class for the session related to the address (i.e., perform internal communication with the SRC module through the signaling of the SRC class); the SRC module caches the corresponding relation forwarded by the network element aiming at the address aiming at the signaling request of the DRA, and does not modify the corresponding relation immediately; when a request of a plurality of network element corresponding relations is sent in sequence, the SRC module sorts according to priority, wherein the priority of the latest received request is highest; therefore, the DRA can identify the IP address conflict caused by the message delay, and the signaling is routed to the correct PCRF network element, so that the VOLTE service is ensured to be normal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a diagram illustrating a mechanism of Gx/Rx interface session binding provided in the related art;
fig. 2 is a schematic diagram showing the location of a DRA provided in the related art in a network;
fig. 3 is a diagram illustrating an error scenario of a mechanism of Gx/Rx interface session binding provided in the related art;
fig. 4 is a flowchart illustrating a session binding method according to an embodiment of the first aspect of the present invention;
fig. 5 is a flowchart illustrating a session binding method according to another embodiment of the first aspect of the present invention;
fig. 6 is a flowchart illustrating a session binding method according to a further embodiment of the first aspect of the present invention;
fig. 7 is a flowchart illustrating a session binding method according to yet another embodiment of the first aspect of the present invention;
fig. 8 is a flowchart illustrating a session binding method according to an embodiment of the second aspect of the present invention;
fig. 9 is a schematic block diagram of a session binding apparatus according to an embodiment of the third aspect of the present invention;
fig. 10 is a schematic block diagram of a session binding apparatus according to a fourth aspect of the present invention;
fig. 11 is a schematic diagram illustrating a session binding method according to an embodiment of the present invention;
fig. 12 is a diagram illustrating a session binding method according to another embodiment of the present invention;
fig. 13 is a schematic diagram illustrating a hardware structure of a computer device according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Prior to explaining the technical aspects of the present invention in detail, the technical terms involved will be explained.
The Gx interface mentioned in the embodiments of the present invention is an interface between a Policy and Charging Enforcement Function (PCEF) device and a Policy and Charging Rules Function (PCRF) device in an LTE/EPC network. The Gx interface is located between the PCEF functional entity and the PCRF functional entity and is used for charging control and policy control. The Gx interface is used to provide or remove PCC rules of the PCRF to or from the PCEF, and to communicate related events from the PCEF to the PCRF.
The Rx interface is an interface between an Application Function (AF) device and a PCRF device, and the Rx interface function mainly implements an interaction function of application-level session information between the AF and the PCRF.
Technical problems existing in the related art will now be briefly described by means of the accompanying drawings. As shown in fig. 3, a common scenario is set, that is, after the IP address is reallocated due to signaling delay existing in the PCRF, the DRA sends the signaling of the Rx port to the wrong PCRF, so that service is blocked. Specifically, the scenario involves two cell phone numbers, say 157, 151, respectively, and two IPV6 addresses, say 3bf, 121, respectively.
1. The number 11:05:19:991, 157 activates IMS APN through SAEGW11, SAEGW initiates CCR-I (Credit control request initial) message to PCRF03, the address of IPV6 used at this time is 3bf, SAEGW11 does not receive CCA response message replied by PCRF03 within 3 seconds, SAEGW is configured according to current office data to refuse IMS APN activation, and Gx session is released; the DRA generates a corresponding relation of 3bf-PCRF 03.
2. The number 11:05:23.148, 157 activates IMS APN through SAEGW08, SAEGW initiates CCR-I to PCRF03, and the used IPV6 address is 121 at this time;
3. the number 11:05:24.668, 151 activates IMS APN through SAEGW11, the IP address allocated to the number by SAEGW11 is just 3bf in step 1, and then SAEGW11 initiates CCR-I to PCRF 02;
4. the PCRF02 replies CCA before the timeout of the timer when the SAEGW waits for the CCA message, the IMS APN activation of the number 151 is successful, the IMS registration is subsequently initiated, meanwhile, the 3bf recorded by the DRA is recorded, and the PCRF corresponding to the address is PCRF 02; the DRA generates a corresponding relation of 3bf-PCRF 02.
5. 25.023, SAEGW11 receives a CCA message replied by PCRF03, the message is the CCA message overtime in step 1, according to the corresponding relation recorded by DRA in step 1, DRA forwards the message to SAEGW11, and the corresponding relation of 3bf is modified to PCRF 03;
6. 11:05:25.101, after receiving the CCA message replied by PCRF03, SAEGW08 successfully activates IMS APN of user 157 number IMS, and subsequently initiates IMS registration;
7. corresponding to the 151 number of the 4 th step, the SBC sends an AAR message carrying address 3bf, the DRA forwards the message to the PCRF03 according to the correspondence of the last time (the 5 th step), and 151 is actually activated in the PCRF02, thereby causing the subsequent 8, 9, 10 to finally cause the call failure;
8. PCRF03 replies with the AAA message in response;
9. the PCRF03 considers that the number corresponding to the address 3bf should be 157 and activation is completed at the SAEGW11, so an RAR message is sent to the SAEGW11 according to the combination of 3bf + 157;
10. since 157 number is already active on SAEGW08 (step 2) and not on SAEGW11, SAEGW11 replies with an RAA message carrying error code 5002. The subsequent SBC considers that PCRF03 does not find the 151 number, and initiates an STR to terminate the session procedure for 151, resulting in a VOLTE call failure for 151 number.
Through the analysis, the reason for the failure of the 151 number VOLTE call is that the PCRF03 replies 157 number CCA message overtime, and sends the message to DRA and SAEGW11 before the 151 number is ready for registration, and DRA generates the corresponding relationship between the IP address 3bf and the PCRF03 according to the recently received CCA message, and modifies the previous corresponding relationship between the IP address 3bf and the PCRF02 which is correct for the 151 number. AAR messages for Rx interfaces for subsequent 151 numbers are erroneously forwarded to PCRF03, causing a call failure.
In order to solve the problems of the related art, embodiments of the present invention provide a session binding method, apparatus, device, and medium. By the technical scheme of the invention, the DRA can distinguish the source of the currently activated IP address, whether the currently activated IP address is normally activated or the previously failed IP address. Thus, the problem of confusion of correspondence due to address conflict can be solved. Meanwhile, the DRA can choose not to adopt the mechanism of the technical scheme of the invention for the address without failure, thereby avoiding the network burden caused by excessive signaling overhead. First, a session binding method provided in the embodiment of the present invention is described below.
Fig. 4 is a flowchart illustrating a session binding method according to an embodiment of the present invention. The method is used in a routing agent node DRA in an LTE system, where the DRA includes a session relation cache SRC module, and as shown in fig. 4, the method includes the following steps:
step 402, receiving a request message for activating an IMS APN initiated by an SAEGW network element through a Gx interface, selecting a PCRF network element with a policy and charging rules function, and generating a forwarding corresponding relation between a first IP address and the first PCRF network element;
step 404, if the first PCRF network element does not respond within the preset time and receives the CCR-F message sent by the SAEGW network element, recording a first IP address carried in the CCR-F message and triggering an SRC-a (SRC-a, session relationship cache response) message, where the SRC-a message carries a corresponding relationship between the first IP address and the first PCRF network element;
step 406, the SRC module caches the correspondence between the first IP address and the first PCRF network element;
step 408, if the session message related to the first IP address is received, triggering the corresponding SRC-type signaling according to the received session message related to the first IP address.
In the Session binding method provided by the embodiment of the present invention, a SRC (Session relationship Cache) module is newly added in the DRA, and is used to dynamically Cache the corresponding relationship between the user IP address and the PCRF network element, and is linked with the SAEGW, DRA, and PCRF, and when the PCRF has signaling delay to cause reallocation of the IP address, the corresponding relationship between the IP address and the PCRF network element is cached without immediate modification, so that the DRA forwards the signaling to the correct PCRF, thereby avoiding unavailability of a service due to failure of the Volte registration process.
The signaling of SRC class is divided into the following categories, as shown in table 1:
TABLE 1 signaling table for SRC classes
Figure BDA0001524959330000081
Fig. 5 is a flowchart illustrating a session binding method according to another embodiment of the present invention. The method is used in a routing agent node DRA in an LTE system, where the DRA includes a session relation cache SRC module, and as shown in fig. 5, the method includes the following steps:
step 502, receiving a request message for activating an IMS APN initiated by an SAEGW network element through a Gx interface, selecting a PCRF network element with a policy and charging rules function, and generating a forwarding corresponding relation between a first IP address and the first PCRF network element;
step 504, if the first PCRF network element does not respond within the preset time and receives the CCR-F message sent by the SAEGW network element, recording a first IP address carried in the CCR-F message and triggering an SRC-a message, where the SRC-a message carries a corresponding relationship between the first IP address and the first PCRF network element;
step 506, the SRC module caches the correspondence between the first IP address and the first PCRF network element;
step 508, in the case that the first PCRF network element does not respond within the preset time, if an IMS registration session message initiated by the SAEGW network element through the Rx interface is received, generating a corresponding relationship between the second IP address and the second PCRF network element;
step 510, if the second IP address is the same as the first IP address, triggering an SRC-a message;
step 512, the SRC module caches the correspondence between the second IP address and the second PCRF network element;
and 514, when the SRC module receives the multiple SRC-a message precedence requests, setting the priority of the corresponding relationship between the first IP address carried in each SRC-a message and the corresponding PCRF network element according to the precedence request order of the multiple SRC-a messages.
In this embodiment, under the condition that the first PCRF network element does not respond within the preset time, if an IMS registration session message initiated by the SAEGW network element through the Rx interface is received, which indicates that the SAEGW network element normally activates an IMS APN request initiated by a certain user, the DRA generates a forwarding correspondence between a second IP address and the second PCRF network element, if the second IP address is the same as the previously recorded first IP address, the SRC-a signaling is triggered, the SRC module receives and responds to the SRC-a signaling, the correspondence between the second IP address and the second PCRF network element is cached without immediate modification, when a plurality of requests for forwarding correspondence between network elements of the first IP address are sent in sequence, the SRC module sorts according to priority, wherein the latest received request has the highest priority, so that it is ensured that the DRA forwards the signaling to the correct PCRF, and it is avoided that the service is not available due to a failure of a Volte registration procedure, thereby ensuring the success rate of the Volte call.
Fig. 6 is a flowchart illustrating a session binding method according to still another embodiment of the present invention. The method is used in a routing agent node DRA in an LTE system, where the DRA includes a session relation cache SRC module, and as shown in fig. 6, the method includes the following steps:
step 602, receiving a request message for activating an IMS APN initiated by an SAEGW network element through a Gx interface, selecting a PCRF network element for policy and charging rules function, and generating a forwarding correspondence between a first IP address and a first PCRF network element;
step 604, if the first PCRF network element does not respond within the preset time and receives the CCR-F message sent by the SAEGW network element, recording a first IP address carried in the CCR-F message and triggering an SRC-a message, where the SRC-a message carries a corresponding relationship between the first IP address and the first PCRF network element;
step 606, the SRC module caches the correspondence between the first IP address and the first PCRF network element;
step 608, in a case that the first PCRF network element does not respond within a preset time, if an IMS registration session message initiated by the SAEGW network element through the Rx interface is received, generating a corresponding relationship between the second IP address and the second PCRF network element;
step 610, if the second IP address is the same as the first IP address, triggering SRC-A information;
step 612, the SRC module caches the correspondence between the second IP address and the second PCRF network element;
step 614, when the SRC module receives the multiple SRC-a message precedence requests, setting the priority of the corresponding relationship between the first IP address carried in each SRC-a message and the corresponding PCRF network element according to the precedence request order of the multiple SRC-a messages;
step 616, if receiving the CCA message overtime replied by the first PCRF network element, triggering the SRC-C message according to the recorded first IP address;
step 618, the SRC module matches the cached correspondence with the correspondence between the first IP address and the first PCRF network element carried in the SRC-C message, discards the matched correspondence, and triggers the SRC to discard the SRC-D message;
and step 620, discarding the CCA message according to the SRC-D message.
In this embodiment, if the DRA receives a CCA message replied by the first PCRF network element, where the message is an overtime CCA message in step 604, at this time, the DRA sends an SRC-C message to the SRC module according to the recorded first IP address, the SRC module receives and responds to the SRC-C message, matches the forwarding correspondence between the first address in the message and the first PCRF network element with the correspondence cached by the SRC module, discards the matched correspondence, and then sends an SRC-D message to notify the DRA of directly discarding the overtime CCA message.
Fig. 7 is a flowchart illustrating a session binding method according to another embodiment of the present invention. The method is used in a routing agent node DRA in an LTE system, where the DRA includes a session relation cache SRC module, and as shown in fig. 7, the method includes the following steps:
step 702, receiving a request message for activating an IMS APN initiated by an SAEGW network element through a Gx interface, selecting a PCRF network element with a policy and charging rules function, and generating a forwarding corresponding relation between a first IP address and the first PCRF network element;
step 704, if the first PCRF network element does not respond within the preset time and receives the CCR-F message sent by the SAEGW network element, recording a first IP address carried in the CCR-F message and triggering an SRC-a message, where the SRC-a message carries a corresponding relationship between the first IP address and the first PCRF network element;
step 706, the SRC module caches the correspondence between the first IP address and the first PCRF network element;
step 708, in a case that the first PCRF network element does not respond within a preset time, if an IMS registration session message initiated by the SAEGW network element through the Rx interface is received, generating a corresponding relationship between the second IP address and the second PCRF network element;
step 710, if the second IP address is the same as the first IP address, triggering an SRC-a message;
step 712, the SRC module caches the correspondence between the second IP address and the second PCRF network element;
step 714, when the SRC module receives the multiple SRC-a message precedence requests, setting the priority of the corresponding relationship between the first IP address carried in each SRC-a message and the corresponding PCRF network element according to the precedence request order of the multiple SRC-a messages;
step 716, if receiving the CCA message overtime replied by the first PCRF network element, triggering the SRC-C message according to the recorded first IP address;
step 718, the SRC module matches the cached correspondence with the correspondence between the first IP address and the first PCRF network element carried in the SRC-C message, discards the matched correspondence, and triggers the SRC to discard the SRC-D message;
step 720, discarding the CCA message according to the SRC-D message;
step 722, if receiving an authorization authentication request AAR message sent by the session border controller SBC, triggering an SRC-U (SRC-Update) message according to the recorded first IP address;
step 724, the SRC module sends the correspondence between the first IP address with the highest priority and the corresponding PCRF network element to the DRA via the SRC-a message, and deletes the cached correspondence;
step 726, according to the corresponding relationship between the first IP address with the highest priority and the corresponding PCRF network element, the AAR message is sent to the corresponding PCRF network element.
In this embodiment, if the first PCRF network element does not respond within the preset time, an AAR message related to the first IP address sent by the session border controller SBC is received, which indicates that the SAEGW network element reallocates the first IP address after releasing the original Gx session, and completes IMS APN activation, and initiates IMS registration, after receiving the AAR message, the DRA sends an SRC-U message to the SRC module, and the SRC module receives and responds to the message, matches the matching relationship according to the network element forwarding matching relationship in the message and the corresponding relationship of its own cache, and informs the correct PCRF of the corresponding relationship between the first IP address with the highest priority and the corresponding PCRF network element through the SRC-a message, and deletes all the corresponding relationships in the cache.
In this embodiment, after the DRA receives the forwarding correspondence between the first address notified by the SRC module and the corresponding network element, the DRA routes the AAR message to the correct PCRF network element.
Fig. 8 is a flowchart illustrating a session binding method according to an embodiment of the present invention. The method is used in a System Architecture Evolution Gateway (SAEGW) network element in an LTE system, and as shown in FIG. 8, the method includes the following steps:
step 802, receiving a request message for activating an IP multimedia subsystem access point name IMS APN initiated by user equipment, and allocating a first IP address for the user equipment;
step 804, sending a credit control request initial CCR-I message to a PCRF network element through a Gx interface, and if a credit control response CCA message returned by the PCRF network element is not received within a preset time, sending a credit control request error CCR-F message to a routing agent node DRA, wherein the CCR-F message carries a first IP address;
step 806, if receiving a CCA message returned by the first PCRF network element within a preset time, initiating an IMS registration session message through an Rx interface;
wherein the CCR-F message is used for indicating the failure of the CCR-I message request to the DRA.
In the session binding method provided by the embodiment of the invention, the user equipment activates the IMS APN through the SAEGW network element, the SAEGW initiates the CCR-I message to the PCRF network element, and simultaneously allocates an IP address, preferably an IPV6 address, to the user equipment. The SAEGW network element does not receive a CCA response message replied by the PCRF network element within a preset time, then refusing IMS APN activation, releasing the Gx interface session, informing DRA through CCR-F message, and carrying the user IP Address in the message through Framed-IP-Address AVP, so that DRA can know that a certain Address needs to be released, triggering SRC type signaling aiming at session related to the Address in subsequent sessions, and caching the network element forwarding corresponding relation aiming at the Address by the SRC module aiming at the signaling request of DRA without immediate modification; when a request of a plurality of network element corresponding relations is sent in sequence, the SRC module sorts according to priority, wherein the priority of the latest received request is highest; therefore, the DRA can identify the IP address conflict caused by the message delay, and the signaling is routed to the correct PCRF network element, so that the VOLTE service is ensured to be normal.
Fig. 9 is a schematic block diagram of a session binding apparatus according to an embodiment of the present invention. The apparatus is used in a routing agent apparatus DRA in an LTE system, and as shown in fig. 9, the apparatus 900 includes:
a receiving unit 902, configured to receive a request message for activating an IP multimedia subsystem access point name IMS APN initiated by a system architecture evolution gateway SAEGW network element through a Gx interface, select a policy and charging rules function PCRF network element, and generate a corresponding relationship between a first IP address and a first PCRF network element;
an interaction unit 904, configured to record a first IP address carried in a CCR-F message and trigger a session relationship cache to respond to an SRC-a message if the first PCRF network element does not respond within a preset time and receives a credit control request error CCR-F message sent by the SAEGW network element, where the SRC-a message carries a corresponding relationship between the first IP address and the first PCRF network element;
a caching unit 906, configured to cache, by using the SRC module, a correspondence between the first IP address and the first PCRF network element;
the interacting unit 904 is further configured to trigger a corresponding SRC-like message according to the session message if the session message related to the first IP address is received.
The Session binding apparatus 900 provided in the embodiment of the present invention adds a SRC (Session relationship Cache) module in the DRA for dynamically caching the corresponding relationship between the user IP address and the PCRF network element, and links with the SAEGW, DRA, and PCRF, and when there is signaling delay in the PCRF and the IP address is reallocated, caches the corresponding relationship between the IP address and the PCRF network element without immediate modification, so that the DRA forwards the signaling to the correct PCRF, thereby avoiding the unavailability of service due to failure in the Volte registration process.
Fig. 10 is a schematic block diagram of a session binding apparatus according to an embodiment of the present invention. Wherein, the apparatus is used in a System Architecture Evolution Gateway (SAEGW) network element in an LTE system, as shown in FIG. 10, the apparatus 1 includes:
a receiving unit 12, configured to receive a request message for activating an access point name IMS APN initiated by a user equipment, and allocate a first IP address to the user equipment;
a sending unit 14, configured to send a credit control request initial CCR-I message to a PCRF, where the message is a credit control response CCA message returned by the PCRF, and if the message is not received within a preset time, send a credit control request error CCR-F message to a routing agent node DRA, where the message carries a first IP address;
if the CCA message is received within the preset time, initiating an IMS registration session message through an Rx interface;
wherein the CCR-F message is used for indicating the failure of the CCR-I message request to the DRA.
In the session binding apparatus 1 provided in the embodiment of the present invention, the user equipment activates the IMS APN through the sae gw network element, and the sae gw initiates a CCR-I message to the PCRF network element, and simultaneously allocates an IP address, preferably an IPV6 address, to the user equipment. The SAEGW network element does not receive a CCA response message replied by the PCRF network element within the preset time, then refuses IMS APN activation, releases the Gx interface session, informs DRA through CCR-F message, and carries the user IP Address in the message through Framed-IP-Address AVP, so that DRA can know that a certain Address needs to be released, triggers SRC signaling aiming at the session related to the Address in the subsequent session, links with SAEGW, DRA and PCRF through dynamically caching the corresponding relation between the user IP Address and PCRF, caches the corresponding relation between the IP Address and PCRF and does not immediately modify, so that DRA forwards the signaling to correct PCRF, and the unavailability of service caused by failed Volte registration process is avoided, thereby ensuring the success rate of Volte call.
To support the functionality of the embodiments of the present invention, this functionality needs to be done in the basic signaling flow. To illustrate the integrity of the new process, two scenarios are chosen for the following description. One is a CCA message for timeout at step 5 of fig. 3 is transmitted before step 7 AAR, and one is a CCA message for timeout at step 5 of fig. 3 is transmitted after step 7 AAR (Authorization Authentication Request).
In a first scenario, as shown in fig. 11, if the CCA message that is timed out in step 5 of fig. 3 is sent before the AAR in step 7, the specific implementation flow is as follows:
1. activating an IMS APN (IP multimedia subsystem) by a 157 number through an SAEGW11, initiating CCR-I to PCRF03 by the SAEGW, wherein the IPV6 address used at the moment is 3bf, the SAEGW11 does not receive CCA response information replied by the PCRF03 within 3 seconds, refusing the activation of the IMS APN [ Access point name information (APN, Access PointName) ] and releasing Gx session;
2. SAEGW11 sends CCR-F message to DRA to inform SRC CCR-I request failure and carries Address 3bf in Framed-IP-Address AVP;
3. DRA records 3bf, responds and sends an internal message SRC-A (SRC-Answer) carrying 3bf, PCRF03, and the SRC module caches the corresponding relation of 3bf-PCRF 03;
4. 151 number activates IMS APN through sae gw11, the IP address allocated to it by sae gw11 is exactly 3bf in step 1, then sae gw11 initiates CCR-I to PCRF 02;
5. the PCRF02 replies CCA before the timeout of the timer when the SAEGW waits for the CCA message, the IMS APN activation of the number 151 is successful, the IMS registration is subsequently initiated, and meanwhile, the DRA generates the corresponding relation of 3bf-PCRF 02;
6. the DRA sends an internal message SRC-A to an SRC module according to the recorded 3bf, the SRC module carries the 3bf and the PCRF02, the SRC module caches the corresponding relation of the 3bf-PCRF02, and simultaneously identifies the priorities as 2 (low) and 1 (high) according to the sequence, namely the 3bf-PCRF03 in the step 3 has the priority of 2 and the 3bf-PCRF02 has the priority of 1;
7. the DRA receives a CCA message replied by the PCRF03, wherein the message is the CCA message overtime in the step 1;
8. the DRA sends an SRC-C (SRC-Cache) message to the SRC according to the recorded 3bf, and the SRC carries the 3bf and the PCRF 03;
9. the SRC responds to the SRC-C message, matches the corresponding relation with the priority of 2 according to 3bf and PCRF03 in the message, and then sends SRC-D (SRC-Drop) to inform DRA of directly discarding the CCA message;
10. corresponding to the step 5, the SBC sends an AAR message to the DRA;
11. the DRA sends SRC-U information to SRC to request corresponding relation according to the recorded 3 bf;
12. the SRC responds to an SRC-U (SRC-Update) message, sends a corresponding relation that SRC-A informs that DRA priority is 1(3bf-PCRF02), and simultaneously deletes all the corresponding relations of the cache, namely deletes the corresponding relations of the 3bf-PCRF02 and the 3bf-PCRF03 cached in the front;
the DRA forwards the AAR message to the correct PCRF 02.
Through the signaling analysis, aiming at the first scene, the DRA can identify the IP address conflict caused by the message delay, and the signaling is routed to the correct PCRF according to a session binding mechanism different from the existing one, so that the VOLTE service is normal.
In a second scenario, as shown in fig. 12, if the CCA message that is timed out in step 5 is sent after the AAR in step 7, the specific implementation procedure is as follows:
steps 1-6 are the same as steps 1-6 in FIG. 11;
7. corresponding to the step 5, the SBC sends an AAR message to the DRA;
8. the DRA sends SRC-U information to SRC to request corresponding relation according to the recorded 3 bf;
9. SRC responds to SRC-U message, sends SRC-A to inform the corresponding relation that DRA priority is 1, and deletes all the corresponding relations of cache at the same time;
10. the DRA forwards the AAR message to the correct PCRF 02;
11. the DRA receives the CCA message replied by PCRF03, which is the CCA message for step 1 timeout. Subsequent processing is preceded by the SAEGW11 replying with a 5002 error code, which is equivalent to the CCA message failing, without affecting any users.
Wherein the content of the first and second substances,
1. in the first and second scenes, a new user initiates a certain non-3 bf address when an activation request is sent again, and the DRA and the SRC do not record and cache the address, so the method does not affect the new user;
2. in a first scene, the 7 th overtime CCA message is suitable for the first scene as long as the message is earlier than the 10 th overtime CCA message, and the previous message interaction is not influenced;
3. in the second scenario, the 11 th overtime CCA message is applicable to the second scenario as long as it is later than the 7 th message, and does not affect the DRA of the 8 th step to send the SRC-U message and subsequent flows.
Through the signaling analysis, aiming at the second scene, the DRA can identify the IP address conflict caused by the message delay, and the signaling is routed to the correct PCRF according to a session binding mechanism different from the existing one, so that the VOLTE service is normal.
Additionally, the session binding methods of the embodiments of the invention described in connection with fig. 4-7 or fig. 8 may be implemented by a computer device. Fig. 13 is a schematic diagram illustrating a hardware structure of a computer device according to an embodiment of the present invention.
The computer device may comprise a processor 21 and a memory 22 in which computer program instructions are stored.
Specifically, the processor 21 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing the embodiments of the present invention.
Memory 22 may include mass storage for data or instructions. By way of example, and not limitation, memory 22 may include a Hard Disk Drive (HDD), a floppy Disk Drive, flash memory, an optical Disk, a magneto-optical Disk, tape, or a Universal Serial Bus (USB) Drive or a combination of two or more of these. Memory 22 may include removable or non-removable (or fixed) media, where appropriate. The memory 22 may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory 22 is a non-volatile solid-state memory. In a particular embodiment, the memory 22 includes Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
The processor 21 implements any of the session binding methods in the above embodiments by reading and executing computer program instructions stored in the memory 22.
In one example, the computer device may also include a communication interface 23 and a bus 20. As shown in fig. 12, the processor 21, the memory 22, and the communication interface 23 are connected to each other via the bus 20 to complete mutual communication.
The communication interface 23 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiments of the present invention.
The bus 20 comprises hardware, software, or both coupling the components of the computer device to each other. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. Bus 20 may include one or more buses, where appropriate. Although specific buses have been described and shown in the embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.
In addition, in combination with the session binding method in the foregoing embodiment, the embodiment of the present invention may be implemented by providing a computer-readable storage medium. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement any of the session binding methods in the above embodiments.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.

Claims (10)

1. A session binding method is used in a routing agent node DRA in an LTE system, wherein the DRA comprises a Session Relation Cache (SRC) module, and the method comprises the following steps:
receiving a request message for activating an IP multimedia subsystem access point name (IMS APN) initiated by a System Architecture Evolution Gateway (SAEGW) network element through a Gx interface, selecting a Policy and Charging Rules Function (PCRF) network element, and generating a corresponding relation between a first IP address and the first PCRF network element;
if the first PCRF network element does not respond within the preset time and receives a credit control request error CCR-F message sent by an SAEGW network element, recording the first IP address carried in the CCR-F message and triggering a session relation cache to respond to an SRC-A message, wherein the SRC-A message carries the corresponding relation between the first IP address and the first PCRF network element;
the SRC module caches the corresponding relation between the first IP address and a first PCRF network element;
if receiving a session message related to the first IP address, triggering a corresponding SRC type message according to the session message;
the step of triggering a corresponding SRC-like message according to the session message if the session message associated with the first IP address is received includes:
under the condition that the first PCRF network element does not respond within the preset time, if an IMS registration session message initiated by the SAEGW network element through an Rx interface is received, generating a corresponding relation between a second IP address and a second PCRF network element;
if the second IP address is the same as the first IP address, triggering the SRC-A message;
and the SRC module caches the corresponding relation between the second IP address and the second PCRF network element.
2. The method of claim 1, further comprising:
and when the SRC module receives the plurality of SRC-A message precedence requests, setting the priority of the corresponding relation between the first IP address carried in each SRC-A message and the corresponding PCRF network element according to the precedence request sequence of the plurality of SRC-A messages.
3. The method according to claim 2, wherein the step of triggering the SRC-like message according to the session message if the session message associated with the first IP address is received further comprises:
if an overtime credit control response CCA message replied by the first PCRF network element is received, triggering SRC cache SRC-C message according to the recorded first IP address;
the SRC module matches the corresponding relation between the first IP address and the first PCRF network element carried in the SRC-C message with the cached corresponding relation, discards the matched corresponding relation, and triggers the SRC to discard the SRC-D message;
and discarding the CCA message according to the SRC-D message.
4. The method according to claim 3, wherein the step of triggering the corresponding SRC type message according to the session message if the session message related to the first IP address is received further comprises:
if receiving an Authorization Authentication Request (AAR) message sent by a Session Border Controller (SBC), triggering the SRC to update an SRC-U message according to the recorded first IP address;
and the SRC module sends the corresponding relation between the first IP address with the highest priority and the corresponding PCRF network element to DRA through the SRC-A message, and deletes the cached corresponding relation.
5. The method of claim 4, further comprising:
and sending the AAR message to the corresponding PCRF network element according to the corresponding relation between the first IP address with the highest priority and the corresponding PCRF network element.
6. A session binding method is used in a System Architecture Evolution Gateway (SAEGW) network element in an LTE system, and the method comprises the following steps:
receiving a request message for activating an IP multimedia subsystem access point name (IMS APN) initiated by user equipment, and allocating a first IP address for the user equipment;
sending a credit control request initial CCR-I message to a PCRF network element through a Gx interface, if a credit control response CCA message returned by the first PCRF network element is not received within a preset time, sending a credit control request error CCR-F message to a routing agent node DRA, and carrying the first IP address in the CCR-F message;
if the CCA message is received within the preset time, initiating an IMS registration session message through an Rx interface;
wherein the CCR-F message is used for indicating the failure of the CCR-I message request to the DRA.
7. A session binding apparatus, for use in a routing agent node DRA in an LTE system, where the DRA includes a Session Relation Cache (SRC) module, the apparatus comprising:
a receiving unit, configured to receive a request message for activating an IP multimedia subsystem access point name IMS APN initiated by a system architecture evolution gateway SAEGW network element through a Gx interface, select a policy and charging rules function PCRF network element, and generate a corresponding relationship between a first IP address and a first PCRF network element;
an interaction unit, configured to record, if the first PCRF network element does not respond within a preset time and a CCR-F message in error of a credit control request sent by an SAEGW network element is received, the first IP address carried in the CCR-F message, and trigger a session relationship cache to respond to an SRC-a message, where the SRC-a message carries a corresponding relationship between the first IP address and the first PCRF network element;
a caching unit, configured to cache, by using the SRC module, a correspondence between the first IP address and a first PCRF network element;
the interaction unit is further configured to trigger a corresponding SRC-like message according to the session message if the session message related to the first IP address is received;
the interaction unit is further configured to trigger a corresponding SRC-like message according to the session message if the session message related to the first IP address is received, and specifically, the triggering is to: under the condition that the first PCRF network element does not respond within the preset time, if an IMS registration session message initiated by the SAEGW network element through an Rx interface is received, generating a corresponding relation between a second IP address and a second PCRF network element;
if the second IP address is the same as the first IP address, triggering the SRC-A message;
and the SRC module caches the corresponding relation between the second IP address and the second PCRF network element.
8. A session binding apparatus, for use in a System Architecture Evolution Gateway (SAEGW) network element in an LTE system, the apparatus comprising:
a receiving unit, configured to receive a request message for activating an IP multimedia subsystem access point name IMS APN initiated by a user equipment, and allocate a first IP address to the user equipment;
a sending unit, configured to send a credit control request initial CCR-I message to a PCRF network element through a Gx interface, and if a credit control response CCA message returned by the first PCRF is not received within a preset time, send a credit control request error CCR-F message to a routing agent node DRA, where the CCR-F message carries the first IP address;
if the CCA message is received within the preset time, initiating an IMS registration session message through an Rx interface;
wherein the CCR-F message is used for indicating the failure of the CCR-I message request to the DRA.
9. A computer device, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, which when executed by the processor, implement the method of any one of claims 1-5 or the method of claim 6.
10. A computer readable storage medium having computer program instructions stored thereon, which when executed by a processor implement the method of any one of claims 1-5 or the method of claim 6.
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