CN108462979B

CN108462979B - Domain selection method for communication and mobile management entity

Info

Publication number: CN108462979B
Application number: CN201710088271.0A
Authority: CN
Inventors: 张秀成; 原晓艳; 刘召阳
Original assignee: China Mobile Group Henan Co Ltd
Current assignee: China Mobile Group Henan Co Ltd
Priority date: 2017-02-17
Filing date: 2017-02-17
Publication date: 2020-08-14
Anticipated expiration: 2037-02-17
Also published as: CN108462979A

Abstract

The invention relates to a domain selection method and a mobile management entity for communication, wherein the domain selection method comprises the following steps: recording the signaling process state of the interaction between the user terminal and the base station; receiving a terminal data query request message; checking the signaling process state; and if the signaling process state is fall back 2G, directly responding to the terminal data query request message and marking that the current attached network of the user terminal does not support the data domain. The invention records the signaling process state of the interaction between the user terminal and the base station respectively according to the type of the received signaling message sent by the base station and the type of the message sent by the mobile switching server, so that the MME can accurately judge the network domain where the user is located, and transmits the information to the HSS through the signaling message, and the SCC-AS can obtain more accurate information of the domain where the user belongs during the domain selection, thereby avoiding the problem of overlong called time delay of the VOLTE user during the CSFB due to the error of the domain selection and improving the user perception of voice service.

Description

Domain selection method for communication and mobile management entity

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a domain selection method and a mobility management entity for communications.

Background

This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present invention, and is believed to provide the reader with useful background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understood that the description in this section is for purposes of illustration and is not an admission of prior art.

When a user uses VOLTE service (IMS-based voice service) as a called party, it may reside in the CS domain (circuit-bearing domain) or in the PS domain (data domain) based on the service used by the user and the network conditions. When the SCC-AS forwards the invite request to establish the call connection, it cannot determine whether the user is in the CS or PS domain, and needs to perform domain selection to determine which network to call from, and a call establishment duration of the called VOLTE user is greatly increased due to a domain selection error.

As shown in fig. 1, in the technical solution of the prior art, a VOLTE user is called in a procedure. When the VOLTE user is called, after receiving the invite request, the SCC-AS needs to determine which network to call from in order to confirm the Domain (CS or PS) where the user is located through the Domain Selection (T-ADS).

In the called domain selection function: when an IMS call is sent to the SCC AS, the SCC AS can initiate a called domain selection information query to the HSS for the called number. If the UDA response returned by the HSS contains IMS-VOICE-OVER-PS-SUPPORTED, the SCC AS selects to page in the IMS domain; if the UDA response returned by the HSS contains IMS-VOICE-OVER-PS-NOT-SUPPORTED, the SCC AS selects to page in the CS domain; if the UDA response returned by the HSS contains IMS-VOICE-OVER-PS-SUPPORTED-UNKNOWN, the SCC AS selects a default paging mode (circuit domain selection) according to local configuration; the inaccurate processing at the domain selection is the following: when SCC _ AS fails in IMS or CS call (called non-response), SCC _ AS should be able to terminate paging in the current domain and attempt re-paging in another domain after the reselection timer expires.

The specific domain selection process is shown in fig. 2, and 1) after receiving the INVITE message, the S-CSCF _ B sends the INVITE message to the SCC-AS _ B according to iFC template data, and triggers the called service and the called network domain selection. 2) SCC-AS sends UDR message to the integrated HLR/HSS to request to obtain the T-ADS domain selection information of the called user. The message carries a data reference as tads (26), which indicates the user data type requested by the UDR message, requesting the called domain selection data. 3) And the MME sends the T-ADS information of the called user to the fused HLR/HSS through the IDA message according to the query result. The information carrying the information element IDR-flags is t-ads-data-request0x01, which represents the user data type requested by the IDR information and requests the called domain selection data. 4) And the MME sends the T-ADS information of the called user to the fused HLR/HSS through the IDA message according to the query result. The message carries the cells ims-voice-over-ps-session-supported. 5) And the fused HLR/HSS returns the T-ADS information to the MMTel _ AS _ B/SCC _ AS _ B through the UDA message according to the IDA message returned by the MME. The message carries a cell shUserData, wherein a domain value IMSVoceVerPSSessionsSupport: indicating whether the user currently attaches to the network to support PS voice. 6) And the SCC-AS _ B judges that the current domain is selected to the IMS network based on the acquired T-ADS information. After SCC-AS _ B determines the network selected by the called domain, the SCC-AS _ B instructs S-CSCF _ B to connect the call to a specific network through an INVITE message.

AS can be seen from the above domain selection process, the domain selection judgment made by the SCC-AS is determined by the shortdata field in the UDA message returned by the HSS, and the shortdata field in the UDA message sent by the HSS to the SCC-AS is determined based on the IMS-VOICE-OVER-PS-session-SUPPORTED field in the IDA message returned by the MME, so that the determination of whether the domain selection is a PS domain is determined depending on the IMS-VOICE-OVER-PS-SUPPORTED field value in the IDA message sent by the MME to the HSS. Due to the problems of network coverage factor, location mobility, signaling conflict, terminal and the like, a VOLTE user on an MME in the current network may perform CSFB fallback or SRVCC handover, and when the user falls back to 2G due to the CSFB or SRVCC handover, if the MME receives an IDR (Insert-Subscriber-Data-Request) query from an HSS, in an IDA (Insert-Subscriber-Data-Answer) message returned to the HSS, the IMS-VOICE-OVER-PS-SUPPORTED field value is still 1. The result of the domain selection of the SCC-AS is the PS domain, and actually the user falls back to the CS domain 2G network at this time, which causes the SCC-AS to select the PS domain for calling, and the user is in the CS domain at this time, resulting in that a new call INVITE request cannot be sent to the user. And after the timer is overtime, calling from the CS region again, and at the moment, the calling party can not hear the voice prompt tone of busy called party or call waiting, the time delay from calling to hearing the prompt tone is longer, and even the condition that the calling party and the like can not directly hang up exists, so that the calling user has poor perception.

Disclosure of Invention

The technical problem to be solved is how to provide a domain selection method and a mobility management entity for communication.

Aiming at the defects in the prior art, the invention provides a domain selection method and a mobile management entity for communication, which can accurately judge the network domain where a user is located.

In a first aspect, the present invention provides a domain selection method, including:

recording the signaling process state of the interaction between the user terminal and the base station;

receiving a terminal data query request message;

checking the signaling process state;

and if the signaling process state is fall back 2G, directly responding to the terminal data query request message and marking that the current attached network of the user terminal does not support the data domain.

Optionally, the recording the signaling process state of the interaction between the user equipment and the base station includes:

and respectively recording the interactive signaling process state of the user terminal and the base station according to the type of the received signaling message sent by the base station and the type of the message sent by the mobile switching server.

Optionally, the signaling process state of the user terminal interacting with the base station is recorded by:

if the signaling message is a user terminal initialization message, marking the state of the user terminal as 0;

if the signaling message is a user terminal uplink and downlink release request message and the event value carried by the message is that the user terminal does not have an available data field, marking the circuit field fallback state of the user terminal as 1;

if the signaling message is a user terminal uplink and downlink release message and the user terminal state is 1, marking the user terminal circuit switched fallback state as 2;

and if the signaling message is a user terminal uplink and downlink release completion message and the user terminal state is 2, marking the user terminal circuit switched domain fallback state to be 3.

the message data domain sent by the mobile switching server is switched to a circuit bearing domain to complete the message, and the continuity state of the single wireless voice call interacted between the user terminal and the base station is recorded as 1.

Optionally, the falling back 2G according to the signaling process state includes:

and if the circuit switched fallback state of the user terminal is 3 or the single wireless voice call continuity state is 1, the signaling process state is fallback 2G.

In another aspect, the present invention further provides a mobility management entity, including:

a signaling process state recording unit, which is used for recording the signaling process state of the interaction between the user terminal and the base station;

a query request message receiving unit for receiving a terminal data query request message;

a signaling process state checking unit for checking the signaling process state;

and the communication execution unit is used for directly responding to the terminal data query request message and marking that the current attached network of the user terminal does not support the data domain if the state is fall back 2G according to the signaling process.

Optionally, the signaling process states of the user equipment interacting with the base station are recorded according to the type of the received signaling message sent by the base station and the type of the message sent by the mobile switching server, respectively.

Optionally, the signaling process state recording unit is configured to:

according to the initialization message of the user terminal, marking the state of the user terminal as 0; or

According to the uplink and downlink release request message of the user terminal, and the event value carried by the message is that the user terminal has no available data field, marking the circuit field fallback state of the user terminal as 1; or

According to the uplink and downlink release information of the user terminal, and the state of the user terminal is 1, the circuit switched fallback state of the marked user terminal is 2; or

And according to the uplink and downlink release completion message of the user terminal, the state of the user terminal is 2, and the circuit switched fallback state of the marked user terminal is 3.

Optionally, the signaling process state recording unit is further configured to:

and switching to a circuit bearing domain according to a message data domain sent by the mobile switching server to complete the message, and recording the continuity state of the single wireless voice call interacted between the user terminal and the base station as 1.

According to the technical scheme, the domain selection method and the mobile management entity for communication respectively record the signaling process state of interaction between the user terminal and the base station according to the type of the received signaling message sent by the base station and the type of the message sent by the mobile switching server, so that the MME accurately judges the network domain where the user is located and transmits the information to the HSS through the signaling message, and the SCC-AS obtains more accurate information of the domain where the user belongs during domain selection, thereby avoiding the problem of overlong called time delay of the VOLTE user during CSFB due to the error of domain selection and improving the user perception of voice service.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a called flow of a VOLTE user in the prior art;

FIG. 2 is a schematic diagram of a domain selection process in the prior art;

FIG. 3 is a flow chart of a domain selection method for communication according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a cs fallback state flow of a ue according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a mobility management entity according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 3, the present invention provides a domain selection method for communication, including: recording the signaling process state of the interaction between the user terminal and the base station; receiving a terminal data query request message; checking the signaling process state; and if the signaling process state is fall back 2G, directly responding to the terminal data query request message and marking that the current attached network of the user terminal does not support the data domain. The present invention and the provided domain selection method are explained in detail below.

In the invention, the recording of the signaling process state of the interaction between the user terminal and the base station comprises the following steps: and respectively recording the interactive signaling process state of the user terminal and the base station according to the type of the received signaling message sent by the base station and the type of the message sent by the mobile switching server. The MME adds two Boolean type variable user terminal circuit domain fallback states CSFB _ STATUS and single radio voice call continuity states SRVCC _ STATUS to each registered user, and records whether the user has fallen back to 2G for conversation. When confirming that the user falls back to 2G, the MME sets this variable to 3; upon confirmation of user attachment or TAU to LTE network, MME sets this variable to 0.

As shown in fig. 4, the signaling process status of the user equipment interacting with the base station is recorded by the following method: if the signaling message is a user terminal initialization message, marking the state of the user terminal as 0; if the signaling message is a user terminal uplink and downlink release request message and the event value carried by the message is that the user terminal does not have an available data field, marking the circuit field fallback state of the user terminal as 1; if the signaling message is a user terminal uplink and downlink release message and the user terminal state is 1, marking the user terminal circuit switched fallback state as 2; and if the signaling message is a user terminal uplink and downlink release completion message and the user terminal state is 2, marking the user terminal circuit switched domain fallback state to be 3. Specifically, after the UE attaches to the 4G network or TAU (Tracking Area Update), the initial value of the variable is 0, and after the user falls back, the value is set to 1. The MME receives an initial UE message (UE uplink and downlink release request message) sent by the eNodeB, indicating that the user has returned to the 4G network, and sets the CSFB _ STATUS of the user to 0. The MME receives a ue-context-release-request message (user terminal uplink and downlink release request message) sent by the eNodeB, the Cause value carried by the message is ue-not-available-for-ps-service (24), and the MME sets the CSFB-STATUS to be 1. And the MME sends a ue-context-release-command message (an uplink and downlink issuing message of the user terminal) to the eNodeB, and the MME sets the CSFB-STATUS to be 2 when the CSFB-STATUS value of the user is 1. And the MME receives ue-context-release-complete message sent by the eNodeB, and the CSFB-STATUS is 2, and the MME sets the CSFB-STATUS to be 3.

In the invention, the signaling process state of the interaction between the user terminal and the base station is recorded by the following modes: the data domain sent by the mobile switching server is switched to the circuit bearing domain to complete the message, and the continuity state of the single wireless voice call interacted between the user terminal and the base station is recorded as 1. When the UE attaches to the 4G network or TAU, the initial value of the variable is 0, and after the MME receives the PS to CS Complete Notification message (the data domain switch to circuit bearer domain Complete message) sent by the MSS and responds to the PSto CS Complete Ack, the SRVCC _ STATUS is set to 1.

In the present invention, the falling back 2G according to the signaling process state includes: and if the circuit switched fallback state of the user terminal is 3 or the single wireless voice call continuity state is 1, the signaling process state is fallback 2G. If the value of CSFB _ STATUS is 3 or the value of SRVCC _ STATUS is 1, it indicates that the user has successfully fallen back to 2G. When receiving an IDR query request (carrying IDR-flags of t-ads-data-request0x01) from the HSS, the MME shall check the values of CSFB _ STATUS and SRVCC _ STATUS of the user, and if CSFB _ STATUS is 3 or SRVCC _ STATUS is 1, directly set IMS-VOICE-OVER-PS-SUPPORTED to 0 in an IDA message replying to the HSS, and if CSFB _ STATUS <3 or SRVCC _ STATUS is 0, execute the original determination procedure.

In order to further embody the advantages of the domain selection method provided by the present invention, the present invention further provides a mobility management entity applying the above method, as shown in fig. 5, including: a signaling process state recording unit, which is used for recording the signaling process state of the interaction between the user terminal and the base station; a query request message receiving unit for receiving a terminal data query request message; a signaling process state checking unit for checking the signaling process state; and the communication execution unit is used for directly responding to the terminal data query request message and marking that the current attached network of the user terminal does not support the data domain if the state is fall back 2G according to the signaling process. The following provides a detailed description of the communication terminal provided by the present invention. The working process of the mobility management entity provided by the present invention is similar to the domain selection method, and may be specifically executed by referring to the method, which is not described herein again.

In the invention, the signaling process state of the interaction between the user terminal and the base station is respectively recorded according to the type of the received signaling message sent by the base station and the type of the message sent by the mobile switching server.

In the present invention, the signaling process state recording unit is configured to: according to the initialization message of the user terminal, marking the state of the user terminal as 0; or according to the uplink and downlink release request message of the user terminal, and the event value carried by the message is that the user terminal has no available data field, marking the circuit field fallback state of the user terminal as 1; or according to the uplink and downlink release information of the user terminal, and the state of the user terminal is 1, the circuit switched fallback state of the marked user terminal is 2; or according to the up and down releasing completion message of the user terminal, the state of the user terminal is 2, and the circuit switched fallback state of the marked user terminal is 3. The signaling process state recording unit is further configured to: and switching to a circuit bearing domain according to a message data domain sent by the mobile switching server to complete the message, and recording the continuity state of the single wireless voice call interacted between the user terminal and the base station as 1.

In summary, the domain selection method and the mobility management entity for communications provided by the present invention respectively record the signaling process state of the interaction between the user terminal and the base station according to the type of the signaling message sent by the base station and the type of the message sent by the mobile switching server, so that the MME accurately determines the network domain where the user is located, and transmits the information to the HSS through the signaling message, so that the SCC-AS obtains more accurate information of the domain where the user belongs when performing domain selection, thereby avoiding the problem of too long called time delay of the VOLTE user when performing CSFB due to a domain selection error, and improving the user perception of the voice service.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention is not limited to any single aspect, nor is it limited to any single embodiment, nor is it limited to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the present invention may be utilized alone or in combination with one or more other aspects and/or embodiments thereof.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims

1. A method for domain selection for communication, comprising:

receiving a terminal data query request message;

checking the signaling process state;

2. The domain selection method according to claim 1, wherein the recording the signaling process status of the interaction between the user equipment and the base station comprises:

3. The domain selection method according to claim 2, wherein the signaling process status of the user terminal interacting with the base station is recorded by:

4. The domain selection method according to claim 2, wherein the signaling process status of the user terminal interacting with the base station is recorded by:

5. The domain selection method according to claim 2, wherein the recording the signaling process status of the interaction between the ue and the bs according to the type of the signaling message received from the bs and the type of the message sent from the mobile switching server comprises:

6. A mobility management entity, comprising:

7. The MME of claim 6, wherein the signaling process status of the UE interacting with the BS is recorded according to the type of the signaling message received from the BS and the type of the message sent from the MSC server.

8. The mobility management entity according to claim 7, wherein the signaling procedure status recording unit is configured to:

9. The mobility management entity according to claim 7, wherein the signaling procedure status recording unit is further configured to:

10. The mobility management entity according to claim 7, wherein the signaling procedure status recording unit is further configured to: