CN106559769B - Communication method, device and terminal - Google Patents
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
Abstract
The invention discloses a communication method, a device and a terminal, comprising the following steps: the terminal accesses a network protocol multimedia subsystem network IMS through a first access network; when the terminal is switched from a first access network to a second access network, the terminal sends an intra-session refresh request to an IMS network side, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises access network types before and after the access network is switched. The communication method, the communication device and the communication terminal can simply and effectively realize the switching of the IMS sensing access network types so as to be convenient for the subsequent differentiated charging aiming at different access network types.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a communication method, apparatus, and terminal.
Background
Volte (voice over LTE) refers to that a terminal user accesses an Evolved Packet Core (EPC) through a Long Term Evolution (LTE) network, and then an IP Multimedia Subsystem (IMS) network provides a high-quality audio/video service for the terminal user. The VoLTE technology brings higher quality, more natural audio and video conversation effect and shorter connection time for users.
The VoLTE network architecture mainly comprises four layers of networks: the first layer is a user layer; the second layer is an access layer, and LTE is an access network; the third layer is a packet core network, and the EPC provides a bearer for voice and data services; the fourth layer is an IMS layer, which provides basic supplementary services of voice/video.
Fig. 1 is a schematic diagram of a conventional VoLTE and volwifi (voice over wifi) network architecture. As shown in fig. 1, the VoLTE services network architecture defined by the Third Generation Partnership Project (3 GPP) includes the following entities: a terminal (UE, User Equipment)101, which is responsible for initiating a service request; an access network 102, typically an Evolved node b (eNodeB) entity, responsible for wireless access of terminals; a Mobility Management Entity (MME) 103 in charge of terminal access authentication and the like; a Serving GateWay (S-GW) 104; a public data network GateWay (P-GW, PDN GateWay)105 providing connectivity of the public data network and the IMS; a Policy and Charging Rule Function (PCRF) 106, which is responsible for acquiring Policy control and Charging rules and notifying the Policy and Charging implementation Function (PCEF), where the P-GW is a PCEF; a Proxy call session control Function (P-CSCF) 107, which is responsible for a user accessing an IMS network; an inquiring call session control Function entity (I-CSCF) and a Serving call session control Function entity (S-CSCF) 108, which are responsible for service control of the IMS user; an Application Server (AS) 109 for providing a basic supplementary service to a user; a Charging Data Function (CDF)/Charging Gateway Function (CGF) 110, which is responsible for outputting a Charging ticket to the billing center.
Wireless Local Area Networks (WLANs) utilize radio frequency technology to realize unobstructed Networks without network cables and without distance restrictions. Among them, wireless fidelity (WIFI) is an important wireless networking technology in WLAN. The voice call is realized through a WIFI network, and the voice call is a common voice solution based on the WLAN, so that the voice call can be supplemented for the fourth generation mobile communication technology (4G) network coverage (especially indoor coverage) of an operator, and the cost of making a call (voice communication) by a user (generally, the voice call rate is low) can be greatly reduced (generally, the voice call rate is low), so that the voice call and the VoLTE become important hotspots of global operators.
The VoWIFI network architecture introduces part of network elements on the basis of the VoLTE network, as shown in fig. 1, the following entities are added: a WLAN access network 111 comprising WIFI access devices; an enhanced public data network gateway (ePDG) 112, responsible for WLAN radio access and connection to the P-GW.
The technical scheme of the VoWIFI effectively makes up the problem of insufficient coverage of VoLTE, supports seamless switching of the VoWIFI and the VoLTE, and does not affect ongoing services including voice communication when a user switches between two access networks. Fig. 2 is a flow chart illustrating a call handover and charging from LTE to WLAN in the prior art. As shown in fig. 2, the user handover establishes a call between LTE and WLAN networks and a handover occurs, including the following key steps:
step 201: a terminal user registers to an IMS network through an LTE network and an EPC network;
step 202: a terminal user initiates a call request, such as a voice call request; the call request reaches a P-GW network element of an EPC network through eNodeB equipment of an LTE network;
step 203: the P-GW network element forwards a call request initiated by a terminal user to a P-CSCF network element of the IMS network;
step 204: the P-CSCF initiates a Diameter protocol AAR (AA-Request) Request to the PCRF, wherein the Request is mainly used for obtaining and subscribing the user access position information;
step 205: the PCRF acquires the position information from the P-GW network element;
step 206: PCRF returns Diameter AAA (AA-Answer) response to P-CSCF, and the response message returns user access location information including access network type, at this time, LTE access;
step 207: P-CSCF forwards the call request to S-CSCF and AS;
step 208: after the S-CSCF and the AS process the call request, a call success response is returned;
step 209: the S-CSCF and the AS can send a charging request to the CDF/CGF so that the CDF/CGF can output a charging bill, wherein the charging request message carries the type of a user access network;
step 210: the CDF/CGF sends a charging response to the S-CSCF and the AS;
step 211: P-CSCF forwards call success response to P-GW;
step 212: P-GW forwards the call success response to the terminal user, at this time, the terminal user can carry out voice conversation with the opposite terminal user, wherein, the media path relates to: network elements such as UE-LTE-SGW-PGW-IMS;
step 213: the terminal user supports switching from an LTE coverage area to a WLAN (WIFI) coverage area, at the moment, the terminal user accesses to a P-GW through the WIFI/ePDG, the P-GW ensures that the address of the terminal user is not changed, and the call of the user who has already communicated can be normally carried out, wherein a media path relates to: and network elements such as UE-WIFI-ePDG-PGW-IMS.
In this way, the terminal user can switch from the LTE to the WLAN network or from the WLAN to the LTE network, and the call which is already in call can be smoothly switched without influencing the call function. And when the user is switched, the IMS network does not sense the network switching, and the IMS network still charges the call which is in conversation according to the call duration. However, many operators propose that VoLTE and VoWIFI use different access networks, and therefore, the IMS network needs to use different charging policies for the different access networks, so as to meet the operation requirements of the operators.
To address this problem, the prior art has the following two solutions. The first scheme is as follows: after the UE completes the switching between the WIFI network and the LTE network, the UE initiates a re-registration process, and switches the related information to the AS of the IMS by carrying the UE through the registration request. Scheme II: after the UE performs Network switching, the P-CSCF senses that the UE is switched according to an IP-CAN (Internet protocol-Connectivity Access Network) session flow, an IP-CAN change event or a Radio Access Type (RAT) change event and the like, and the P-CSCF notifies the AS of the IMS.
However, the first solution has the following disadvantages: first, the scheme depends on an intermediate network element, because a Session Border Controller (SBC)/P-CSCF proxy registration function may terminate a partial registration, which may cause a registration with a handover indication to be absorbed; secondly, the scheme has high requirements on the S-CSCF and the AS, the registration and the call are associated by the S-CSCF and the AS, and the association of the registration and the call by the S-CSCF and the AS is very complicated for a shared Public User Identity (PUI) scene (a plurality of terminals share one number). The second scheme has the following defects: firstly, the scheme requires that P-CSCF/PCRF/P-GW continuously detects that the terminal access network changes or the subscription terminal access network changes; secondly, the P-CSCF actively constructs a new message to inform the AS, and the AS is required to analyze the new message and associate the existing call; it can be seen that this scheme is too complex and highly dependent on other network elements.
Disclosure of Invention
In order to solve the technical problem, the present invention provides a communication method, apparatus and terminal, which can simply and effectively implement the switching of IMS aware access network types, so as to facilitate the subsequent differentiated charging for different access network types.
In order to achieve the above technical object, the present invention provides a communication method applied to a terminal, including: the terminal accesses the IMS through a first access network; when the terminal is switched from a first access network to a second access network, the terminal sends an intra-session refresh request to an IMS network side, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises access network types before and after access network switching.
The present invention also provides a terminal, comprising: the communication module is used for accessing the IMS through a first access network; the terminal comprises a sending module and an IMS network side, wherein the sending module is used for sending an intra-session refreshing request to the IMS network side after the terminal is switched from a first access network to a second access network, the intra-session refreshing request carries access network switching indication information, and the access network switching indication information comprises access network types before and after the access network is switched.
The invention also provides a communication method, which is applied to the IMS network side and comprises the following steps: a P-CSCF in an IMS receives a session refresh request initiated by a terminal when an access network type is switched, and sends the session refresh request to an S-CSCF or an AS in the IMS, wherein the session refresh request carries access network switching indication information, and the access network switching indication information comprises the access network types before and after the access network switching; and the S-CSCF or the AS generates a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request, and sends the charging request to the CDF or the CGF.
The invention also provides a communication system, which is applied to the IMS network side and comprises: P-CSCF and S-CSCF or AS; the P-CSCF is used for receiving an intra-session refresh request initiated by the terminal when the access network type is switched and sending the intra-session refresh request to the S-CSCF or the AS, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises the access network type before and after the access network switching; and the S-CSCF or the AS is used for generating a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request and sending the charging request to the CDF or the CGF.
The invention also provides a communication method, which is applied to S-CSCF or AS in IMS and comprises the following steps: an S-CSCF or AS receives an intra-session refresh request, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises access network types before and after access network switching; and the S-CSCF or the AS generates a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request, and sends the charging request to the CDF or the CGF.
The invention also provides a communication device, which is applied to S-CSCF or AS in IMS, and comprises: the device comprises a receiving module, a processing module and a processing module, wherein the receiving module is used for receiving an in-session refreshing request, the in-session refreshing request carries access network switching indication information, and the access network switching indication information comprises access network types before and after access network switching; and the sending module is used for generating a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request, and sending the charging request to the CDF or the CGF.
In the invention, a terminal accesses an IMS through a first access network; when the terminal is switched from a first access network to a second access network, the terminal sends an intra-session refresh request to an IMS network side, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises access network types before and after the access network is switched. In the invention, when the access network type is switched, the terminal actively sends the in-session refresh request carrying the access network types before and after the access network is switched, so that the IMS network can sense the switching of the access network types.
In the embodiment of the invention, the terminal actively sends the in-session refresh request when the access network type is switched, so that the IMS network senses the switching of the access network type, and further realizes the differential charging of the call switching scene based on the LTE network and the WLAN. Moreover, the embodiment of the invention is simple and effective to realize, has low requirement on the intermediate network element, and is not only suitable for offline charging but also suitable for online charging; the method is not only suitable for the trusted terminal, but also suitable for the untrusted terminal; the method is not only suitable for calls with established calls, but also suitable for calls without established calls; not only for calls that have already been established, but also for calls that have not been established.
Drawings
Fig. 1 is a schematic diagram of a conventional VoLTE and VoWIFI network architecture;
fig. 2 is a flow chart of call handover and charging from LTE to WLAN for a user in the prior art;
fig. 3 is a flowchart of a communication method according to an embodiment of the present invention;
FIG. 4 is a flowchart of a first embodiment of the present invention;
FIG. 5 is a flowchart illustrating a second embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it should be understood that the embodiments described below are only for illustrating and explaining the present invention and are not intended to limit the present invention.
Fig. 3 is a flowchart of a communication method according to an embodiment of the present invention. As shown in fig. 3, the communication method provided in this embodiment is applied to a terminal, and includes the following steps:
step 301: the terminal accesses the IMS through a first access network;
step 302: when the terminal is switched from a first access network to a second access network, the terminal sends an intra-session refresh request to an IMS network side, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises access network types before and after the access network is switched.
The in-session refreshing request can adopt the existing message, and the access network switching indication information is the extended content of the existing message.
After step 301, before the terminal is handed over from the first access network to the second access network, the method further comprises: the terminal sends a call request to an IMS network side through a first access network, wherein the call request carries the type of the current access network.
The method for sending the call request to the IMS network side by the terminal through the first access network includes: the terminal sends a call request to an IMS network side through a first access network and a P-GW in an EPC, wherein the call request carries the current access network type.
Here, the terminal sending an intra-session refresh request to the IMS network side includes: and the terminal sends an intra-session refreshing request to the IMS network side through a second access network and the P-GW in the EPC, wherein the intra-session refreshing request carries access network switching indication information, and the access network switching indication information comprises the types of access networks before and after the access network switching.
Herein, after the terminal is switched from the first access network to the second access network, before the terminal sends an intra-session refresh request to the IMS network side, the method further includes: the terminal waits for an initial call to enter a conversation state.
Specifically, the intra-session refresh request corresponds to a call being made. For the established call, when the terminal is switched to an access network, the terminal actively constructs a refresh request in the conversation; if the initial call does not enter the conversation state, the terminal needs to wait for the call to enter the conversation state and then sends an in-conversation refresh request.
Herein, the first access network and the second access network are different types of access networks, wherein the types of access networks include: LTE network, WLAN.
Specifically, if the terminal senses that the type of the access network is switched from the LTE network to the WLAN or from the WLAN to the LTE network, the terminal actively initiates a session refreshing request carrying access network switching indication information; if the terminal senses that the type of the access network is switched from the LTE network to the LTE network or from the WLAN to the WLAN, the terminal does not need to actively initiate an intra-session refresh request and does not send access network switching indication information.
In addition, an embodiment of the present invention further provides a communication method, applied to an IMS network side, including: a P-CSCF in an IMS receives a session refresh request initiated by a terminal when an access network type is switched, and sends the session refresh request to an S-CSCF or an AS in the IMS, wherein the session refresh request carries access network switching indication information, and the access network switching indication information comprises the access network types before and after the access network switching; and the S-CSCF or the AS generates a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request, and sends the charging request to the CDF or the CGF.
Further, after the S-CSCF or the AS sends the charging request to the CDF or the CGF, the method further includes: and the CDF or the CGF sends a charging bill to an accounting center, wherein the charging bill comprises the types of the access networks and the conversation time corresponding to each type of the access networks.
In an embodiment, when the terminal is an untrusted terminal, after the P-CSCF in the IMS receives an intra-session refresh request initiated by the terminal during an access network type handover, before the intra-session refresh request is sent to an S-CSCF or an AS in the IMS, the method further includes:
the P-CSCF acquires the current actual access network type by inquiring the PCRF;
and the P-CSCF inserts the access network types before and after the access network switching determined according to the current actual access network type and the last access network type stored locally into the in-session refreshing request.
Further, before the P-CSCF in the IMS receives an intra-session refresh request initiated by the terminal at the time of access network type handover, the method further includes: a P-CSCF in an IMS receives a call request initiated by a terminal, wherein the call request carries the type of a current access network; and the P-CSCF sends the call request to the S-CSCF or the AS.
In an embodiment, when the terminal is an untrusted terminal, after a P-CSCF in the IMS receives a call request initiated by the terminal, and before the P-CSCF sends the call request to an S-CSCF or an AS, the method further includes: the P-CSCF acquires the current actual access network type by inquiring the PCRF; and the P-CSCF inserts the current actual access network type obtained by the query into the call request.
In addition, an embodiment of the present invention further provides a communication method, which is applied to an S-CSCF or an AS in an IMS, and includes: an S-CSCF or AS receives an intra-session refresh request, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises access network types before and after access network switching; and the S-CSCF or the AS generates a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request, and sends the charging request to the CDF or the CGF.
Specifically, the S-CSCF or the AS receives an in-session refresh request, the in-session refresh request carries access network switching indication information, the access network switching indication information comprises access network types before and after access network switching, and the S-CSCF or the AS analyzes and identifies the access network switching indication information and carries the access network type after access network switching and switching time in a charging request sent to the CDF/CGF. And then, the CDF/CGF sends a charging bill to the tent center, wherein the charging bill comprises the access network type and the call time corresponding to each access network type, so that the tent center can realize differentiated charging aiming at different access network types according to the charging bill. And for a scene of switching for multiple times, the CDF/CGF counts and calculates each access network type and the call time corresponding to the access network type.
The present invention will be described below with reference to specific examples.
Example one
In this embodiment, for a trusted terminal, the IMS network uses access network information and access network handover indication information carried by the terminal to implement differentiated charging for call handover based on LTE and WLAN. As shown in fig. 4, the present embodiment includes the following steps:
step 401: a terminal user registers to an IMS through an MME (mobility management entity) of an EPC (evolved packet core), an S-GW (S-GW) and a P-GW (P-GW) through an LTE (Long term evolution) network so as to initiate a service request later;
step 402: a terminal user initiates a call request, such as a voice call request, which reaches a P-GW of an EPC through eNodeB equipment of an LTE network, wherein the call request carries access network information, and the access network information comprises an access network type;
step 403: the P-GW forwards a call request initiated by a terminal user to a P-CSCF of the IMS;
step 404: P-CSCF forwards the call request to S-CSCF and AS;
step 405: after the S-CSCF and the AS process the call request, a call success response is returned;
step 406: based on the operator strategy, the S-CSCF and the AS can independently or jointly send a charging request to the CDF/CGF, wherein the charging request carries the type of the access network;
step 407: the CDF/CGF sends a charging response to the S-CSCF and the AS;
step 408: P-CSCF forwards call success response to P-GW;
step 409: P-GW forwards the call success response to the terminal user, at this time, the terminal user can carry out voice conversation with the opposite terminal user, wherein, the media path relates to: network elements such as UE-LTE-SGW-PGW-IMS;
step 410: the terminal user switches from the LTE coverage area to a Wlan (WIFI) coverage area, at this time, the terminal user accesses to the P-GW through the WIFI/ePDG, and a call that the terminal user has already conversed can be normally performed, wherein the media path involves: network elements such as UE-WIFI-ePDG-PGW-IMS;
step 411: a terminal user perceives that the terminal user is switched from LTE To WIFI, and for an established call, the terminal user actively constructs and sends an in-Session refresh request, for example, an UPDATE message defined by a Session Initiation Protocol (SIP), where the request message needs To extend access network switching indication information, the indication information may be implemented by extending an SIP field or a parameter, the indication information includes access network types before and after the access network is switched, taking the switching from LTE To WIFI as an example, and the indication information is, for example, LTE To WIFI, but the present invention is not limited thereto; if the initial call does not enter the conversation state, the terminal user actively constructs and sends an in-conversation refreshing request after waiting for the initial call to establish the conversation state;
step 412: the P-GW transparently transmits an in-session refreshing request to the P-CSCF;
step 413: the P-CSCF forwards the refresh request in the session to the S-CSCF and the AS;
step 414: after the S-CSCF and the AS process the in-session refresh request, a successful response is returned, and the S-CSCF and the AS need to analyze and identify access network switching indication information in the in-session refresh request;
step 415: the S-CSCF and the AS send a charging request to the CDF/CGF, wherein the charging request carries a new access network type and switching time, if the CDF/CGF is switched from the LTE to the WLAN, the new access network type is filled in at the moment and is the WLAN, and if the CDF/CGF is switched from the WLAN to the LTE, the new access network type is filled in at the moment and is the LTE;
step 416: the CDF/CGF sends a charging response to the S-CSCF and the AS;
step 417: P-CSCF forwards the successful response corresponding to the refresh request in the dialogue to P-GW;
step 418: and the P-GW transmits a successful response to the terminal user to complete the access network type switching.
Through the steps, the CDF/CGF can record the access network type of the initial call and simultaneously record the new access network type and the switching time in the switching scene, so that each access network type and the call time are contained in the charging bill output by the CDF/CGF, and differential charging of the billing center is facilitated. In a multi-handoff scenario, the CDF/CGF can calculate each access network type and talk time. When the initial call does not enter the conversation state, if the terminal is switched, the terminal needs to wait for the initial call to enter the conversation state, and then the terminal actively initiates a refresh request in the conversation.
Example two
In this embodiment, for an untrusted terminal, the IMS network considers that access network information and access network handover indication information carried by the terminal are untrusted, and based on locally stored access network information and current access network information obtained through PCRF query, obtains access network handover indication information through analysis, so as to implement differentiated charging for call handover based on LTE and WLAN. Here, taking the example that the terminal user switches from the LTE network to the WLAN, as shown in fig. 5, the present embodiment includes the following steps:
step 501: the terminal user is registered to the IMS through the MME, S-GW and P-GW of the EPC through the LTE network;
step 502: a terminal user initiates a call request, such as a voice call, and the call request passes through eNodeB equipment of an LTE network and reaches P-GW of EPC, wherein the call request carries access network information, and the access network information comprises an access network type;
step 503: the P-GW forwards a call request initiated by a terminal user to a P-CSCF of the IMS;
step 504: the P-CSCF initiates an AAR request to the PCRF, wherein the request is mainly used for acquiring the user access position information;
step 505: the PCRF acquires user access network location information from the P-GW;
step 506: the PCRF returns an AAA response to the P-CSCF, and returns user access location information including an access network type in a response message, wherein the access is LTE access;
step 507: the P-CSCF inserts the user access network location information obtained from the PCRF into the call request, and forwards the call request to the S-CSCF and the AS;
step 508: after the S-CSCF and the AS process the call request, a call success response is returned;
step 509: based on the operator strategy, the S-CSCF and the AS can send a charging request to the CDF/CGF independently or together, wherein the charging request carries the type of the access network;
step 510: the CDF/CGF sends a charging response to the S-CSCF and the AS;
step 511: P-CSCF forwards call success response to P-GW;
step 512: P-GW forwards the call success response to the terminal user, and the terminal user can carry out voice communication with the opposite terminal user at the moment, wherein the media path relates to: network elements such as UE-LTE-SGW-PGW-IMS;
step 513: the terminal user is switched to a WLAN (WIFI) coverage area from an LTE coverage area, the terminal user accesses to a PGW through the WIFI/ePDG at the moment, and a call which the terminal user has communicated with can be normally carried out, wherein a media path relates to: network elements such as UE-WIFI-ePDG-PGW-IMS;
step 514: the method comprises the following steps that a terminal user perceives that LTE is switched to WIFI, the terminal user actively constructs and sends a refresh request in a conversation, such as UPDATE and other messages, the refresh request in the conversation needs to be expanded to access network switching indication information, the indication information can be realized by expanding SIP fields/parameters, and the indication information comprises access network types before and after access network switching; if the initial call does not enter the conversation state, the terminal user actively constructs and sends an in-conversation refreshing request after waiting for the initial call to establish the conversation state;
step 515: the P-GW transparently transmits an in-session refreshing request to the P-CSCF;
step 516: the P-CSCF initiates an AAR request to the PCRF, wherein the request is mainly used for acquiring the user access position information;
517: the PCRF acquires user access position information from the P-GW;
step 518: the PCRF returns an AAA response to the P-CSCF, and the response message returns the user access position information including the type of the access network, namely the WLAN access;
step 519: the P-CSCF analyzes the locally stored access network position information of the initial call and the current access network position information obtained from the PCRF, constructs access network switching indication information, inserts the constructed access network switching indication information into an intra-session refreshing request, and forwards the intra-session refreshing request to the S-CSCF and the AS;
step 520: after the S-CSCF and the AS process the in-session refresh request, a successful response is returned, and the S-CSCF and the AS need to analyze and identify access network switching indication information in the in-session refresh request;
step 521: the S-CSCF and the AS send a charging request to the CDF/CGF, wherein the charging request carries a new access network type and switching time; if the LTE is switched to the WLAN, filling in a new access network type as the WLAN, and if the LTE is switched to the WLAN, filling in a new access network type as the LTE;
step 522: the CDF/CGF sends a charging response to the S-CSCF and the AS;
step 523: P-CSCF transmits success response to P-GW;
step 524: the P-GW transmits a successful response to the terminal user to complete the switching.
Through the steps, the CDF/CGF can record the access network type of the initial call and simultaneously record the new access network type and the switching time in the switching scene, so that the charging bill output by the CDF/CGF contains each access network type and the call time, and differential charging of the billing center is facilitated. For a multi-time switching scene, the terminal sends a session refreshing request carrying access network switching indication information for multiple times.
In summary, in the embodiment of the present invention, when the access network type is switched, the terminal actively sends the in-session refresh request, so that the IMS senses that the access network type is switched, thereby implementing the differential charging based on the call switching scenarios of the LTE network and the WLAN. The embodiment of the invention is not only suitable for offline charging, but also suitable for online charging; the method is not only suitable for the trusted terminal, but also suitable for the untrusted terminal; the method is not only suitable for a steady state calling scene, but also suitable for an unsteady state calling scene. Meanwhile, the embodiment of the invention also supports multiple switching scenes.
In addition, an embodiment of the present invention further provides a terminal, including: the communication module is used for accessing the IMS through a first access network; the terminal comprises a sending module and an IMS network side, wherein the sending module is used for sending an intra-session refreshing request to the IMS network side after the terminal is switched from a first access network to a second access network, the intra-session refreshing request carries access network switching indication information, and the access network switching indication information comprises access network types before and after the access network is switched.
Further, the sending module is further configured to send, after the communication module accesses the IMS through the first access network and before the terminal is switched from the first access network to the second access network, a call request to the IMS network side through the first access network, where the call request carries a current access network type.
The first access network and the second access network are different types of access networks, wherein the types of the access networks include: LTE network, WLAN.
In practical applications, the communication module and the sending module are communication elements with information transmission capability, such as a transmitter. However, the present invention is not limited thereto. In addition, the specific processing flow of the terminal is the same as that of the method, and thus is not described herein again.
In addition, an embodiment of the present invention further provides a communication system, which is applied to an IMS network side, and includes: P-CSCF and S-CSCF or AS; the P-CSCF is used for receiving an intra-session refresh request initiated by the terminal when the access network type is switched and sending the intra-session refresh request to the S-CSCF or the AS, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises the access network type before and after the access network switching; and the S-CSCF or the AS is used for generating a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request and sending the charging request to the CDF or the CGF.
Further, the system further comprises: and the CDF or CGF is used for sending a charging bill to the tent center, wherein the charging bill comprises the access network type and the conversation time corresponding to each access network type.
In addition, an embodiment of the present invention further provides a communication apparatus, which is applied to an S-CSCF or an AS in an IMS, and includes: the device comprises a receiving module, a processing module and a processing module, wherein the receiving module is used for receiving an in-session refreshing request, the in-session refreshing request carries access network switching indication information, and the access network switching indication information comprises access network types before and after access network switching; and the sending module is used for generating a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request, and sending the charging request to the CDF or the CGF.
In practical applications, the receiving module is a communication element with information receiving capability, such as a receiver, and the sending module is a communication element with information transmitting capability, such as a transmitter. However, the present invention is not limited thereto.
In addition, the specific processing flow of the system and the apparatus is the same as that of the method, and thus is not described herein again.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention.
Claims (17)
1. A communication method applied to a terminal is characterized by comprising the following steps:
the terminal accesses an IP multimedia subsystem network IMS through a first access network;
when the terminal is switched from a first access network to a second access network, the terminal sends an intra-session refresh request to a service call session control function entity (S-CSCF) or an Application Server (AS) at an IMS network side through the second access network and a P-GW in an EPC, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises access network types before and after access network switching.
2. The method of claim 1, wherein after the terminal accesses the IMS through the first access network and before the terminal is handed over from the first access network to the second access network, further comprising: the terminal sends a call request to an IMS network side through a first access network, wherein the call request carries the type of the current access network.
3. The method of claim 2, wherein the terminal sends the call request to the IMS network side through the first access network, and the method comprises: the terminal sends a call request to an IMS network side through a public data network gateway P-GW in a first access network and a packet core network EPC, wherein the call request carries the current access network type.
4. The method of claim 1, wherein after the terminal is handed over from the first access network to the second access network, before the terminal sends an intra-session refresh request to the IMS network side, further comprising: the terminal waits for an initial call to enter a conversation state.
5. The method of claim 1, wherein the first access network and the second access network are different types of access networks, wherein the types of access networks comprise: a long term evolution, LTE, network, a wireless local area network, WLAN.
6. A terminal, comprising:
the communication module is used for accessing the IMS through a first access network;
and the sending module is used for sending an intra-session refresh request to a service call session control function entity (S-CSCF) or an Application Server (AS) at an IMS network side through the second access network and a P-GW in an EPC after the terminal is switched from the first access network to the second access network, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises access network types before and after the access network is switched.
7. The terminal of claim 6, wherein the sending module is further configured to send a call request to the IMS network side through the first access network after the communication module accesses the IMS through the first access network and before the terminal is handed over from the first access network to the second access network, where the call request carries a current access network type.
8. The terminal of claim 6, wherein the first access network and the second access network are different types of access networks, wherein the types of access networks include: LTE network, WLAN.
9. A communication method is applied to an IMS network side of a network protocol IP multimedia subsystem network, and is characterized by comprising the following steps: a proxy call session control function entity P-CSCF in the IMS receives an in-session refresh request initiated by a terminal through a second access network and a P-GW in an EPC when the access network type is switched, and sends the in-session refresh request to a service call session control function entity S-CSCF or an application server AS in the IMS, wherein the in-session refresh request carries access network switching indication information, and the access network switching indication information comprises the access network types before and after the access network switching;
and the S-CSCF or the AS generates a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request, and sends the charging request to a charging data function entity CDF or a charging gateway function entity CGF.
10. The method of claim 9, wherein after the S-CSCF or AS sends the charging request to the CDF or CGF, further comprising: and the CDF or the CGF sends a charging bill to an accounting center, wherein the charging bill comprises the types of the access networks and the conversation time corresponding to each type of the access networks.
11. The method of claim 9, wherein when the terminal is an untrusted terminal, after the P-CSCF in the IMS receives an intra-session refresh request initiated by the terminal at the time of access network type handover, and before the P-CSCF in the IMS sends the intra-session refresh request to an S-CSCF or an AS in the IMS, the method further comprises: the P-CSCF acquires the current actual access network type by inquiring a policy charging rule functional entity (PCRF);
and the P-CSCF inserts the access network types before and after the access network switching determined according to the current actual access network type and the last access network type stored locally into the in-session refreshing request.
12. The method of claim 9, wherein prior to the P-CSCF in the IMS receiving an in-session refresh request initiated by a terminal upon an access network type handover, further comprising: a P-CSCF in the IMS receives a call request initiated by a terminal, wherein the call request carries the type of a current access network;
and the P-CSCF sends the call request to the S-CSCF or the AS.
13. The method of claim 12, wherein when the terminal is an untrusted terminal, after the P-CSCF in the IMS receives a call request initiated by the terminal and before the P-CSCF sends the call request to the S-CSCF or the AS, further comprising: the P-CSCF acquires the current actual access network type by inquiring the PCRF;
and the P-CSCF inserts the current actual access network type obtained by the query into the call request.
14. A communication system is applied to an IMS network side, and is characterized by comprising: P-CSCF and S-CSCF or AS;
the P-CSCF is used for receiving an intra-session refresh request initiated by a P-GW in a second access network and an EPC when the access network type is switched by a terminal, and sending the intra-session refresh request to the S-CSCF or the AS, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises the access network types before and after the access network switching;
and the S-CSCF or the AS is used for generating a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request and sending the charging request to the CDF or the CGF.
15. The system of claim 14, further comprising: and the CDF or CGF is used for sending a charging bill to the tent center, wherein the charging bill comprises the access network type and the conversation time corresponding to each access network type.
16. A communication method is applied to an S-CSCF or AS in an IMS, and is characterized by comprising the following steps: an S-CSCF or AS receiving terminal receives an intra-session refresh request sent by a P-GW in an EPC through a second access network, wherein the intra-session refresh request carries access network switching indication information, and the access network switching indication information comprises access network types before and after access network switching;
and the S-CSCF or the AS generates a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request, and sends the charging request to the CDF or the CGF.
17. A communication apparatus, which is applied to an S-CSCF or an AS in an IMS, comprising: the device comprises a receiving module and a processing module, wherein the receiving module is used for receiving an intra-session refreshing request sent by a terminal through a second access network and a P-GW in an EPC, the intra-session refreshing request carries access network switching indication information, and the access network switching indication information comprises access network types before and after access network switching;
and the sending module is used for generating a charging request carrying the switched access network type and the switched time of the access network according to the received intra-session refreshing request, and sending the charging request to the CDF or the CGF.
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| CN201510628624.2A CN106559769B (en) | 2015-09-28 | 2015-09-28 | Communication method, device and terminal |
| PCT/CN2016/088213 WO2017054542A1 (en) | 2015-09-28 | 2016-07-01 | Communication method and apparatus, and terminal |
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| CN201510628624.2A CN106559769B (en) | 2015-09-28 | 2015-09-28 | Communication method, device and terminal |
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| CN109302728B (en) * | 2017-07-24 | 2020-10-20 | 展讯通信（上海）有限公司 | Call switching method and device, storage medium, base station and terminal |
| CN112055392B (en) * | 2017-08-09 | 2022-07-01 | 维沃移动通信有限公司 | Mobility management method, user equipment and network side equipment |
| CN113497638A (en) * | 2020-03-18 | 2021-10-12 | 深圳传音控股股份有限公司 | Information indication method and related product |
| CN115087048B (en) * | 2021-03-10 | 2023-10-31 | 北京小米移动软件有限公司 | Communication method, device and medium |
| CN117395161A (en) * | 2022-07-04 | 2024-01-12 | 大唐移动通信设备有限公司 | Layer two statistic transmission method, network device, device and storage medium |
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| US8189752B2 (en) * | 2007-09-05 | 2012-05-29 | Alcatel Lucent | Per-session dynamic charging caps in communication networks |
| CN103490910A (en) * | 2013-10-17 | 2014-01-01 | 金陵科技学院 | Method for charging session contents |
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| GB201122387D0 (en) * | 2011-12-28 | 2012-02-08 | Vodafone Espana Sau | Establishing international calls |
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| US8189752B2 (en) * | 2007-09-05 | 2012-05-29 | Alcatel Lucent | Per-session dynamic charging caps in communication networks |
| CN102137374A (en) * | 2010-09-10 | 2011-07-27 | 华为技术有限公司 | Charging call ticket generating method, system and device based on multimedia subsystem |
| CN103490910A (en) * | 2013-10-17 | 2014-01-01 | 金陵科技学院 | Method for charging session contents |
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