CN108462979B - Domain selection method for communication and mobile management entity - Google Patents

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

A domain selection method and mobility management entity for communication

technical field

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

Background technique

This section introduces the reader to background art that may be related to various aspects of the present invention, and is believed to provide the reader with useful background information so as to help the reader better understand various aspects of the present invention. Therefore, it is to be understood that the descriptions in this section are for the above-mentioned purposes and do not constitute an admission of prior art.

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

As shown in FIG. 1 , in the technical solution of the prior art, a VOLTE user is called a process. When a VOLTE user is the called party, after receiving the invite request, the SCC-AS needs to use the domain selection (T-ADS: Terminating Access Domain Selection) to determine which network to call from in order to confirm the domain (CS or PS) where the user is located.

In the called domain selection function: when the 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 chooses to perform paging in the IMS domain; if the UDA response returned by the HSS contains IMS-VOICE-OVER-PS-NOT-SUPPORTED, then The SCC AS chooses to perform paging in the CS domain; if the UDA response returned by the HSS contains IMS-VOICE-OVER-PS-SUPPORTED-UNKNOWN, the SCC AS selects the default paging mode (selecting the circuit domain) according to the local configuration; The handling of inaccurate selection is as follows: when the SCC_AS fails to call in the IMS or CS (the called party does not respond), after the reselection timer expires, the SCC_AS should be able to terminate the paging in the current domain and try in another domain. Repage.

The specific domain selection process is shown in Figure 2. 1) After receiving the INVITE message, S-CSCF_B sends an INVITE message to SCC-AS_B according to the iFC profile data to trigger the called service and called network domain selection. 2) The SCC-AS sends a UDR message to the converged HLR/HSS, requesting to acquire the T-ADS domain selection information of the called user. The message carries the datareference as tads(26), which indicates the user data type requested by the UDR message, and requests the called domain selection data. 3) The MME sends the T-ADS information of the called user to the converged HLR/HSS through the IDA message through the query result. The information element idr-flags carried in the message is t-ads-data-request0x01, which indicates the user data type requested by the IDR message, and requests the called domain selection data. 4) The MME sends the T-ADS information of the called user to the converged HLR/HSS through the IDA message through the query result. The message carries the cell ims-voice-over-ps-session-supported. 5) The fusion 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 information element shUserData is carried in the message, and one of the field values is IMSVoiceOverPSSessionSupport: indicating whether the currently attached network of the user supports PS voice. 6) 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, it instructs S-CSCF_B to connect the call to a specific network through an INVITE message.

It can be seen from the above domain selection process that the domain selection judgment of SCC-AS is determined by the shUserData field in the UDA message returned by the HSS, and the shUserData field in the UDA message sent by the HSS to the SCC-AS is based on the IDA returned by the MME. It is determined by the ims-voice-over-ps-session-supported field in the message, so whether the domain selection is the PS domain depends on the value of the IMS-VOICE-OVER-PS-SUPPORTED field in the IDA message sent by the MME to the HSS. decided. Due to network coverage factors, location movement, signaling conflicts, terminals and other issues, VOLTE users on the MME in the existing network will perform CSFB fallback or SRVCC handover. The incoming IDR (Insert-Subscriber-Data-Request) query, in the IDA (Insert-Subscriber-Data-Answer) message replied to the HSS, the value of the IMS-VOICE-OVER-PS-SUPPORTED field is still 1. The domain selection result of SCC-AS is the PS domain, but in fact, the user has fallen back to the CS domain 2G network, which causes the SCC-AS domain to select the PS domain to make a call, and the user is in the CS domain at this time, resulting in new The call INVITE request for could not be sent to the user. After the timer expires, make a call from the CS area again. At this time, the caller can hear the voice prompt tone that the called party is busy or call waiting. The delay from the caller's call to hearing the prompt tone is long, even if there is a caller, etc. The situation of directly hanging up without the prompt tone makes the calling user feel very poor.

SUMMARY OF THE INVENTION

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

In view of the defects in the prior art, the present invention provides a domain selection method and a mobility management entity for communication, which can accurately determine the network domain where the user is located.

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

Record the signaling process status of the interaction between the user terminal and the base station;

Receive a terminal data query request message;

Check the status of the signaling process;

If the signaling process state is falling back to 2G, the terminal data query request message is directly responded to, marking that the network currently attached to the user terminal does not support the data field.

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

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 signaling process states of the interaction between the user terminal and the base station are respectively recorded.

Optionally, the signaling process state of the interaction between the user terminal and the base station is recorded in the following manner:

If the signaling message is a user terminal initialization message, marking the user terminal status 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 has no available data field, mark the user terminal's CS domain fallback state as 1;

If the signaling message is an uplink and downlink release message of the user terminal, and the user terminal status is 1, the CS domain fallback status of the user terminal will be marked as 2;

If the signaling message is a user terminal uplink and downlink release complete message, and the user terminal status is 2, the user terminal CS fallback status will be marked as 3.

Optionally, the signaling process state of the interaction between the user terminal and the base station is recorded in the following manner:

The message data field sent by the mobile switching server is switched to the circuit bearer field complete message, and the single wireless voice call continuity status of the interaction between the user terminal and the base station is recorded as 1.

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

If the CS domain fallback status of the user terminal is 3 or the single wireless voice call continuity status is 1, the signaling process status is fallback 2G.

On the other hand, the present invention also provides a mobility management entity, comprising:

a signaling process state recording unit, used to record the signaling process state of the interaction between the user terminal and the base station;

a query request message receiving unit, configured to receive a terminal data query request message;

a signaling process state viewing unit, configured to view the signaling process state;

The communication execution unit is configured to directly respond to the terminal data query request message when the state of the signaling process is to fall back to 2G, and mark that the network currently attached to the user terminal does not support the data field.

Optionally, the signaling process state of the interaction between the user terminal and the base station is separately 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.

Optionally, the signaling process state recording unit is used for:

According to the user terminal initialization message, mark the user terminal status as 0; or

According to the user terminal uplink and downlink release request message, and the event value carried in the message is that the user terminal has no available data field, mark the user terminal CS domain fallback state as 1; or

According to the user terminal's uplink and downlink publishing messages, and the user terminal state is 1, the user terminal's CS domain fallback state will be marked as 2; or

According to the user terminal uplink and downlink release completion message, the user terminal status is 2, and the user terminal CS domain fallback status will be marked as 3.

Optionally, the signaling process state recording unit is further used for:

According to the message data field switching to the circuit bearer field complete message sent by the mobile switching server, it is recorded that the single wireless voice call continuity status of the interaction between the user terminal and the base station is 1.

As can be seen from the above technical solutions, the domain selection method and mobility management entity for communication provided by the present invention respectively record the 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 message type sent by the mobile switching server. The signaling process status enables the MME to accurately determine the network domain where the user is located, and transmit the information to the HSS through signaling messages, so that the SCC-AS obtains more accurate information about the domain to which the user belongs during domain selection, thereby avoiding The problem of long time delay when VOLTE users are called in CSFB caused by wrong selection improves the user perception of voice services.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

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

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

3 is a schematic flowchart of a domain selection method for communication in an embodiment of the present invention;

4 is a schematic flowchart of a CS domain fallback state of a user terminal in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a mobility management entity in an embodiment of the present invention.

Detailed ways

In order to make the purposes, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 3 , the present invention provides a method for domain selection 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; If the signaling process state is falling back to 2G, the terminal data query request message is directly responded to, marking that the network currently attached to the user terminal does not support the data field. The present invention and the provided domain selection method are described in detail below.

In the present invention, recording the signaling process state of the interaction between the user terminal and the base station includes: respectively recording the signaling process state of the 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 message type sent by the mobile switching server. . The MME adds two Boolean type variables to each registered user: the user terminal circuit domain fallback status CSFB_STATUS and the single wireless voice call continuity status SRVCC_STATUS, to record whether the user has fallen back to the 2G call status. When confirming that the user falls back to 2G, the MME sets this variable to 3; when confirming that the user is attached or TAU to the LTE network, the MME sets this variable to 0.

As shown in FIG. 4 , the signaling process status of the interaction between the user terminal and the base station is recorded in the following ways: if the signaling message is a user terminal initialization message, mark the user terminal status as 0; if the signaling message is a user terminal initialization message is a user terminal uplink and downlink release request message, and the event value carried in the message is that the user terminal has no available data field, marking the user terminal CS domain fallback state as 1; if the signaling message is a user terminal uplink and downlink release message, and If the user terminal status is 1, the user terminal CS fallback status will be marked as 2; if the signaling message is a user terminal uplink and downlink release complete message, and the user terminal status is 2, the user terminal CS domain fallback status will be marked as 3 . Specifically, after the UE attaches to the 4G network or TAU (Tracking Area Update), the initial value of this variable is 0, and after the user falls back, the value is set to 1. The MME receives the initial UE message (the user terminal uplink and downlink release request message) sent by the eNodeB, indicating that the user has returned to the 4G network, and the MME sets the CSFB_STATUS of the user to 0. The MME receives the ue-context-release-request message (user terminal uplink and downlink release request message) sent by the eNodeB, and the Cause value carried in the message is ue-not-available-for-ps-service(24), the MME will CSFB_STATUS is set to 1. The MME sends a ue-context-release-command message (user terminal uplink and downlink release message) to the eNodeB, and the CSFB_STATUS value of the user is 1 at this time, then the MME sets the CSFB_STATUS to 2. The MME receives the ue-context-release-complete (user terminal uplink and downlink release complete message) sent by the eNodeB, and CSFB_STATUS=2, then the MME sets CSFB_STATUS to 3.

In the present invention, the state of the signaling process of the interaction between the user terminal and the base station is recorded in the following ways: the data domain is switched to the circuit bearer domain completion message sent by the mobile switching server, and the single wireless voice call continuous between the user terminal and the base station is recorded. Sexual status is 1. When the UE attaches to the 4G network or TAU, the initial value of this variable is 0. After the MME receives the PS to CS Complete Notification message (the data domain is switched to the circuit bearer domain complete message) sent by the MSS, and responds to the PSto CS Complete Ack, it will SRVCC_STATUS is set to 1.

In the present invention, the fallback to 2G according to the signaling process state includes: if the UE CS domain fallback state 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 means that the user has successfully dropped back to 2G. When receiving the IDR query request from HSS (carrying idr-flags as t-ads-data-request0x01), MME should check the value of CSFB_STATUS and SRVCC_STATUS of the user. If CSFB_STATUS=3 or SRVCC_STATUS=1, it will directly reply to HSS The IMS-VOICE-OVER-PS-SUPPORTED is set to 0 in the IDA message of . If CSFB_STATUS<3 or SRVCC_STATUS=0, the original judgment setting process is performed.

In order to further embody the superiority of the domain selection method provided by the present invention, the present invention also provides a mobility management entity applying the above method, as shown in FIG. 5 , comprising: a signaling process state recording unit for recording the user terminal and the base station The interactive signaling process state; the query request message receiving unit is used to receive the terminal data query request message; the signaling process state viewing unit is used to view the signaling process state; the communication execution unit is used to If the process state is set to fall back to 2G, the terminal data query request message is directly responded to, marking that the network currently attached to the user terminal does not support the data field. The communication terminal provided by the present invention will be described in detail below. The working process of the mobility management entity provided by the present invention is similar to the above-mentioned domain selection method, and can be specifically implemented with reference to the above-mentioned method, which will not be repeated here.

In the present invention, the signaling process state of the interaction between the user terminal and the base station is recorded separately 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 used to: mark the user terminal state as 0 according to the user terminal initialization message; or according to the user terminal uplink and downlink release request message, and the event value carried in the message is that the user terminal does not In the available data field, mark the CS domain fallback status of the user terminal as 1; or according to the uplink and downlink release messages of the user terminal, and the user terminal status is 1, the user terminal CS domain fallback status will be marked as 2; or according to the user terminal uplink and downlink release complete message, the UE state is 2, and the CS domain fallback state of the UE will be marked as 3. The signaling process state recording unit is further configured to: according to the message data field of the message sent by the mobile switching server to switch to the circuit bearer field complete message, record the single wireless voice call continuity state of the interaction between the user terminal and the base station as 1.

To sum up, the domain selection method and mobility management entity for communication provided by the present invention respectively record the information of the 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. Make the process state so that the MME can accurately determine the network domain where the user is located, and transmit the information to the HSS through signaling messages, so that the SCC-AS can obtain more accurate information about the domain to which the user belongs during domain selection, thereby avoiding the need for domain selection. The problem of long delay when VOLTE users are called on CSFB caused by errors improves the user perception of voice services.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a 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, etc.) 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 present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element. The orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must be It has a specific orientation, is constructed and operates in a specific orientation, and therefore should not be construed as a limitation of the present invention. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of the present invention, numerous specific details are set forth. It will be 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 is to be understood that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment in order to simplify the present disclosure and to aid in the understanding of one or more of the various aspects of the invention. , figures, or descriptions thereof. However, this method of disclosure should not be construed to reflect the intention 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 in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and/or permutation of these aspects and/or embodiments. Furthermore, each aspect and/or embodiment of the invention may be used 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 solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. The scope of the invention should be included in the scope of the claims and description of the present invention.

Claims (10)

1. a domain selection method for communication, is characterized in that, comprises: Record the signaling process status of the interaction between the user terminal and the base station; Receive a terminal data query request message; Check the status of the signaling process; If the signaling process state is falling back to 2G, the terminal data query request message is directly responded to, marking that the network currently attached to the user terminal does not support the data field. 2. The domain selection method according to claim 1, wherein the recording of the signaling process state of the interaction between the user terminal and the base station comprises: 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 signaling process states of the interaction between the user terminal and the base station are respectively recorded. 3. The domain selection method according to claim 2, wherein the signaling process state of the interaction between the user terminal and the base station is recorded in the following manner: If the signaling message is a user terminal initialization message, marking the user terminal status as 0; If the signaling message is a user terminal uplink and downlink release request message, and the event value carried in the message is that the user terminal does not have a data field available, mark the user terminal's CS domain fallback state as 1; If the signaling message is an uplink and downlink release message of the user terminal, and the user terminal status is 1, the CS domain fallback status of the user terminal will be marked as 2; If the signaling message is a user terminal uplink and downlink release complete message, and the user terminal status is 2, the user terminal CS fallback status will be marked as 3. 4. The domain selection method according to claim 2, wherein the signaling process state of the interaction between the user terminal and the base station is recorded in the following manner: The message data field sent by the mobile switching server is switched to the circuit bearer field complete message, and the single wireless voice call continuity status of the interaction between the user terminal and the base station is recorded as 1. 5. domain selection method according to claim 2, is characterized in that, described according to the type of the signalling message that the received base station sends and the message type that the mobile switching server sends, record respectively the signalling process that user terminal interacts with base station Status includes: If the CS domain fallback status of the user terminal is 3 or the single wireless voice call continuity status is 1, the signaling process status is fallback 2G. 6. A mobile management entity, characterized in that, comprising: a signaling process state recording unit, used to record the signaling process state of the interaction between the user terminal and the base station; a query request message receiving unit, configured to receive a terminal data query request message; a signaling process state viewing unit, configured to view the signaling process state; The communication execution unit is configured to directly respond to the terminal data query request message when the state of the signaling process is to fall back to 2G, and mark that the network currently attached to the user terminal does not support the data field. 7. The mobility management entity according to claim 6, wherein the signaling process state of the interaction between the user terminal and the base station is based on the type of the received signaling message sent by the base station and the message type sent by the mobile switching server recorded separately. 8. The mobility management entity according to claim 7, wherein the signaling process state recording unit is used for: According to the user terminal initialization message, mark the user terminal status as 0; or According to the user terminal uplink and downlink release request message, and the event value carried in the message is that the user terminal has no available data field, mark the user terminal CS domain fallback state as 1; or According to the user terminal's uplink and downlink publishing messages, and the user terminal state is 1, the user terminal's CS domain fallback state will be marked as 2; or According to the user terminal uplink and downlink release completion message, the user terminal status is 2, and the user terminal CS domain fallback status will be marked as 3. 9. The mobility management entity according to claim 7, wherein the signaling process state recording unit is further used for: According to the message data field switching to the circuit bearer field complete message sent by the mobile switching server, it is recorded that the single wireless voice call continuity status of the interaction between the user terminal and the base station is 1. 10. The mobility management entity according to claim 7, wherein the signaling process state recording unit is further used for: If the CS domain fallback status of the user terminal is 3 or the single wireless voice call continuity status is 1, the signaling process status is fallback 2G.

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