CN108834189B

CN108834189B - Method for shielding user circuit switched fallback call based on S1 signaling

Info

Publication number: CN108834189B
Application number: CN201810654091.9A
Authority: CN
Inventors: 马秀荣; 孙万飞; 单云龙; 王妍; 高涛; 李泓锐
Original assignee: Tianjin University of Technology
Current assignee: Yango University
Priority date: 2018-06-22
Filing date: 2018-06-22
Publication date: 2021-10-29
Anticipated expiration: 2038-06-22
Also published as: CN108834189A

Abstract

The invention provides a method for shielding a user circuit switched fallback call based on an S1 signaling. The specific process comprises the following steps: capturing an S1 signaling through an S1 interface of a user control plane, and screening out an initialization context establishment response signaling and a UE context modification response signaling; extracting unique identification information (MME UE S1AP ID) allocated to the user equipment by a Mobility Management Entity (MME) on an S1 link from the signaling; comparing the unique identification information which is extracted from the signaling and distributed to the user equipment by the mobility management entity MME on the S1 link with the content in the member UMMEID in the array element of the user information shielding structure U, if the unique identification information is the same as the content in the member UMMEID, stopping sending the initialization context establishment response signaling, and interrupting the original CSFB call flow of the user shielding; if the difference is different, the transmission is still carried out according to the original signaling flow; the invention can shield the circuit switched fallback conversation of a specific user without interfering signals of other users.

Description

Method for shielding user circuit switched fallback call based on S1 signaling

Technical Field

The invention relates to the technical field of wireless mobile communication, in particular to a method for shielding a Circuit Switched Fallback (CSFB) call based on an S1 signaling.

Background

With the construction and development of the TD-LTE system, the service of the TD-LTE system is more and more popular. The general use of the TD-LTE system service brings great convenience to people, and simultaneously, the possibility of illegal behaviors and other situations through voice communication is greatly increased. There is a need to study related technologies to contain the occurrence of illegal activities.

Because the voice service in the packet domain cannot be realized due to various limitations in the initial network construction stage of the TD-LTE system, the Circuit Switched Fallback (CSFB) scheme currently undertakes most of the voice service in the TD-LTE system. And because of slow network construction and the support of user terminal equipment, the circuit domain fallback scheme will continue to undertake the main voice service for a long time in the TD-LTE system.

At present, a method for shielding a circuit switched fallback call mainly utilizes a high-power interference signal to perform power suppression on a signal in a certain area, so that a normal signal is annihilated in the interference signal, and the circuit switched fallback call is shielded.

However, this shielding method cannot accurately determine the shielding range and causes great interference to other signals.

Disclosure of Invention

The invention aims to provide a method for shielding a user Circuit Switched Fallback (CSFB) call based on an S1 signaling, which can solve the problems that in the conventional CSFB call shielding process, a high-power shielding device suppresses signal interference caused by noise and cannot distinguish user shielding, and realizes accurate user shielding.

The invention is realized by the following technical scheme: a method for shielding a circuit switched domain fallback call based on S1 signaling, the method comprising:

step S21, capturing S1 signaling through a user control plane S1 interface, and screening out an initialization context establishment response signaling and a UE context modification response signaling;

step S22, establishing a response signaling for the initialization context, and extracting the unique identification information distributed to the user equipment by the mobility management entity MME on the S1 link;

step S23, comparing the unique identification information, which is extracted from the initialization context setup response signaling and allocated to the user equipment by the mobility management entity MME on the S1 link, with the content in the member UMMEID in the array element of the shielding user information structure U, if the unique identification information is the same as the content in the member UMMEID, executing step S24, and if the unique identification information is different from the content in the member UMMEID, executing step S25;

step S24, stopping sending the initialization context establishment response signaling, and interrupting the original CSFB call flow of the shielded user;

step S25, the initialization context establishment response signaling is still transmitted according to the original signaling flow;

step S26, for the UE context modification response signaling, extracting the unique identification information distributed to the user equipment by the mobility management entity MME on the S1 link;

step S27, comparing the unique identification information, which is extracted from the UE context modification response signaling and allocated to the user equipment by the mobility management entity MME on the S1 link, with the content in the array element member UMMEID of the shielding user information structure U, if the unique identification information and the content are the same, executing step S28, and if the unique identification information and the content are different, executing step S29;

step S28, blocking the UE context modification response signaling, and interrupting the original CSFB call flow of the shielded user;

step S29, the UE context modification response signaling is still transmitted according to the original signaling flow.

Further, before performing the step S21, the method further includes:

step S10, creating a user information shielding structure U, and representing three members of the user information shielding by using three array elements in the user information shielding structure U: UPHNo, UIMSI, UMMEID, and storing the structure U in a dedicated server arranged between a base station eNB and a mobility management entity MME;

the member UPHNo is used for recording the mobile phone number information of the screening user, the member UIMSI is used for recording the international mobile subscriber identity IMSI information of the screening user, and the member UMMEID is used for recording the unique identification information distributed to the user equipment by the mobility management entity MME of the screening user on the S1 link;

defining a shielding user total number variable Nue for recording the number of shielding users; creating an array U [ i ] of the user information shielding structure U, wherein i is the serial number of the shielding user; the i-0., Nue-1;

step S11, acquiring the mobile phone number information of the shielding user, and inputting the mobile phone number information into the content of the member UPHNo in the array U [ i ] element of the user information shielding structure U;

step S12, according to the mobile phone number information of the shielded user in the array element member UPHNo of the shielded user information structure U, obtaining the international mobile subscriber identity IMSI information of the shielded user corresponding to the mobile phone number information of the user, and filling the international mobile subscriber identity IMSI information into the content of the member UIMSI of the array element of the shielded user information structure U;

step S13, according to the shielded user international mobile subscriber identity IMSI information in the array U [ i ] element member UIMSI of the shielded user information structure U, inquiring the mobile management entity MME to obtain the unique identification information distributed by the mobile management entity MME to the user equipment on the S1 link according to the shielded user international mobile subscriber identity IMSI information, and storing the unique identification information distributed by the mobile management entity MME of the shielded user to the user equipment on the S1 link into the content of the array element member UMMEID of the shielded user information structure.

Further, the step S12 includes:

inquiring a user information data table according to the shielding user mobile phone number information in the array element member UPHNo of the shielding user information structure body U:

(1) if the shielded user mobile phone number information recorded in the array element member UPHNo of the shielded user information structure U exists in the user information data table, searching shielded user International Mobile Subscriber Identity (IMSI) information corresponding to the shielded user mobile phone number information in the user information data table, and storing the shielded user International Mobile Subscriber Identity (IMSI) information into the array element member UIMSI of the shielded user information structure U;

(2) if the user information data table does not have the shielding user mobile phone number information recorded in the array element UPHNo of the shielding user information structure U, inquiring a Home Subscriber Server (HSS), acquiring shielding user International Mobile Subscriber Identity (IMSI) information corresponding to the shielding user mobile phone number, and storing the shielding user International Mobile Subscriber Identity (IMSI) information into the array element member UIMSI of the shielding user information structure U; and correspondingly storing the mobile phone number information of the shielded user and the International Mobile Subscriber Identity (IMSI) information of the shielded user into the user information data table.

Further, the process of filling and shielding the mobile phone number information of the user in step S11 specifically includes:

acquiring a mobile phone number of a shielding user according to the information table of the shielding user number;

and inputting the mobile phone number information of the shielding user in the number information table of the shielding user into the array U [ i ] element U [ i ] of the structure U of the shielding user information one by one.

Further, before performing the step S21, the method further includes:

defining a variable Mid1, configured to store unique identification information allocated to the user equipment by the mobility management entity MME on the S1 link in the initialization context setup response signaling; a variable Mid2 is defined for storing the unique identification information allocated to the UE by the mobility management entity MME on the S1 link in the UE context modification response signaling.

Further, before performing the step S11, the method further includes:

establishing a shielded user number information table, and inputting the mobile phone number information of the shielded user, wherein the number of information items established in the shielded user number information table is the number of the shielded users recorded by the shielded user total number variable Nue, and the shielded user serial number i in the shielded user number information table is 0.

Loading the user number information shielding table, wherein the array element members UPHNo of the user information shielding structure U are extracted one by one according to the serial number corresponding to the user number information shielding table

According to the technical scheme of the invention, the beneficial effects of the invention are as follows:

the invention shields the Circuit Switched Fallback (CSFB) call of the specific user in the service area of the relevant base station by setting the specific shielding user, so that the mobile phone is in a state that the CSFB call can not be carried out; the method avoids transmitting high-power interference signals and solves the problem that power suppression interference noise interferes other signals.

Drawings

Fig. 1 is a flowchart of a method for shielding a Circuit Switched Fallback (CSFB) call based on S1 signaling according to the present invention;

FIG. 2 is a flow chart of a circuit switched fallback calling call signaling in an idle state of a user according to an embodiment of the present invention;

fig. 3 is a signaling flowchart illustrating the wireless signal shielding of the cs domain fallback calling party call in the idle state of the user based on the S1 signaling in the embodiment of the present invention;

FIG. 4 is a flow chart of a circuit switched fallback calling call signaling in the user connection state according to the embodiment of the present invention;

fig. 5 is a signaling flowchart illustrating the wireless signal shielding of the cs domain fallback calling party call in the connected state of the user based on the S1 signaling in the embodiment of the present invention;

FIG. 6 is a flow chart of a circuit switched fallback called call signaling in an idle state of a user according to an embodiment of the present invention;

fig. 7 is a signaling flowchart illustrating the wireless signal shielding of the cs domain fallback called call in the idle state of the user based on the S1 signaling in the embodiment of the present invention;

FIG. 8 is a flow chart of a circuit switched fallback called call signaling in the user connection state according to the embodiment of the present invention;

fig. 9 is a signaling flowchart of shielding a wireless signal of a cs domain fallback called call in a connected state of a user based on S1 signaling in the embodiment of the present invention.

Detailed Description

Hereinafter, a specific embodiment of the present invention will be described with reference to fig. 1 to 9.

The invention provides a method for shielding a user circuit switched fallback call based on an S1 signaling, the implementation process is shown in FIG. 1, in order to implement the method for shielding the user circuit switched fallback call based on the S1 signaling, the following settings are required to be made in advance:

1. an exclusive server is added between a base station eNB and a mobility management entity MME, and all signaling interacted between the base station eNB and the mobility management entity MME needs to pass through the exclusive server.

Two tables are maintained in the dedicated server as follows:

1) and the user information data table is used for recording the mobile phone number information of all known users and the International Mobile Subscriber Identity (IMSI) information corresponding to the mobile phone number information of the users.

The user information data table comprises three fields: a user serial number ueid (ue id), a user mobile number uephno (ue PHone number) and a user international mobile subscriber identity ueimsi (ue imsi). The type of the UEID field is char and is used for storing a user serial number; the type of the UEPH field is char, and the UEPH field is used for storing the number information of the mobile phone of the user; the type of the UEIMSI field is char, which is used for storing the International Mobile Subscriber Identity (IMSI) information of the subscriber.

The user information recorded in the user information data table is added and stored from the conventional method of masking the user information and manually adding and storing the known user information. The user serial number, the user mobile phone number information and the user International Mobile Subscriber Identity (IMSI) information form one piece of information in the user information data table.

2) And the shielding user number information table is used for recording the mobile phone number of the shielding user at this time.

The shielded subscriber number information table comprises two fields: serial number ID, shielding user mobile phone number PHNo. Wherein, the field type of the serial number ID is char and is used for recording the shielding user serial number; the field type of the PHNo for shielding the mobile phone number of the user is char, and the field type is used for recording the mobile phone number of the shielding user. Defining a shielding user total number variable Nue for recording the number of shielding users; and the serial number ID in the shielding user number information table takes the value of ID 0.

Taking the total number of the shielded users, namely, the number of the shielded users is 3: the information of the mobile phone number of the shielded user 1 is 16801001239, the information of the International Mobile Subscriber Identity (IMSI) is 460001004201239, and the unique identifier (MME UE S1AP ID) allocated to the User Equipment (UE) by a Mobility Management Entity (MME) on an S1 link is 2155872522; the information of the mobile phone number of the shielded user 2 is 16801001240, the information of the international mobile subscriber identity IMSI is 460001004201240, and the unique identifier (MME UE S1AP ID) allocated to the User Equipment (UE) by the Mobility Management Entity (MME) on the S1 link is 2155872523; the mobile phone number information of the mute user 3 is 16801001241, the international mobile subscriber identity IMSI information is 460001004201241, and the unique identifier (MME UE S1AP ID) allocated to the User Equipment (UE) by the Mobility Management Entity (MME) on the S1 link is 2155872524;

the user information data table stores information for masking the user 1. The information for shielding the user 1 is: the ue id field is 1, the user mobile phone number UEPHNo field is 16801001239, the ue imsi field is 460001004201239, and the user information data table is specifically shown in table 1:

TABLE 1

UEID	UEPHNo	UEIMSI
			1	16801001239	460001004201239

2. Creating a user information shielding structure body U, and respectively representing three members of the user information shielding by using three array elements in the user information shielding structure body U: UPHNo, UIMSI, UMMEID. And storing the structure U in a dedicated server arranged between the base station eNB and the MME.

A masked user information structure U is created, the masked user information structure U including a plurality of array U [ i ] elements U [ i ]. Three array elements are respectively used for representing three members for shielding user information: UPHNo, UIMSI, UMMEID. The first member UPHNo is used for recording the mobile phone number information of the screening user, the second member UIMSI is used for recording the International Mobile Subscriber Identity (IMSI) information of the screening user, and the third member UMMEID is used for recording the unique identification (MME UE S1AP ID) information distributed to User Equipment (UE) by a Mobility Management Entity (MME) of the screening user on an S1 link.

struct U

{

char UPHNo[11]；

char UIMSI[15]；

char UMMEID[12]；

}；

Defining a shielding user total number variable Nue, which is used for recording the number of shielding users, wherein Nue is 3; creating an array U [ i ] of the user information shielding structure U, wherein i is the serial number of the user, and i is 0, 1, 2;

struct U u[3]。

3. after the user structure U is created, the contents of the three members of the array elements in the structure are filled in. The process of adding member content specifically is as follows:

and step S11, acquiring the mobile phone number information of the shielding user, and inputting the mobile phone number information into the content of the member UPHNo in the array U [ i ] element U [ i ] of the user information shielding structure U. The specific process is as follows:

according to the shielding user number information table, inputting the shielding user mobile phone number information, wherein the number of the shielding user mobile phone number information is 3, and the shielding user number information table after completion is as shown in table 2:

TABLE 2

ID	PHNo
		1	16801001239
2	16801001240
		3	16801001241

Loading the user number shielding information table, and inputting the user mobile phone number shielding information in the user number shielding information table into the array U [ i ] element U [ i ] of the user information shielding structure U one by one;

u[1].UPHNo＝16801001239；

u[2].UPHNo＝16801001240；

u[3].UPHNo＝16801001241；

step S12, according to the shielding user mobile phone number information in the array U [ i ] element U [ i ] UPHNo of the shielding user information structure U, obtaining shielding user International Mobile Subscriber Identity (IMSI) information corresponding to the user mobile phone number information, and filling the shielding user International Mobile Subscriber Identity (IMSI) information into the content of the member UIMSI of the array U [ i ] element U [ i ] of the shielding user information structure U. The specific implementation process is as follows:

inquiring a user information data table according to the shielding user mobile phone number information in the array U [ i ] element U [ i ] of the shielding user information structure U:

(1) if the user information data table has the shielding user mobile phone number information recorded in the array U [ i ] element U [ i ] UPHNo of the shielding user information structure U, searching shielding user International Mobile Subscriber Identity (IMSI) information corresponding to the shielding user mobile phone number information in the user information data table, and storing the shielding user International Mobile Subscriber Identity (IMSI) information into the array U [ i ] element U [ i ] UIMSI of the shielding user information structure U;

(2) if the user information data table does not have the information of the number of the shielding user mobile phone recorded in the array U [ i ] element U [ i ] of the shielding user information structure U, the Home Subscriber Server (HSS) is inquired, the information of the shielding user International Mobile Subscriber Identity (IMSI) corresponding to the number of the shielding user mobile phone is obtained and is stored in the array U [ i ] element U [ i ] UIMSI of the shielding user information structure U; correspondingly storing the information of the mobile phone number of the shielded user and the information of the International Mobile Subscriber Identity (IMSI) of the shielded user into the user information data table;

inquiring the user information data table about the shielded user mobile phone number information 16801001239 recorded by the array U [1] element U [1] UPHNo of the shielded user information structure U, and storing the shielded user International Mobile Subscriber Identity (IMSI) information 460001004201239 corresponding to the shielded user mobile phone number information in the user information data table into the array U [1] element U [1] UIMSI of the shielded user information structure U due to the shielded user mobile phone number information in the user information data table; inquiring the user information data table about the shielding user mobile phone number information 16801001240 recorded by the array U [2] element U [2] UPHNo of the shielding user information structure U, inquiring a Home Subscriber Server (HSS) because the shielding user mobile phone number information does not exist in the user information data table, acquiring the shielding user International Mobile Subscriber Identity (IMSI) information 460001004201240, and storing the shielding user International Mobile Subscriber Identity (IMSI) information in the array U [2] element U [2] UIMSI of the shielding user information structure U; inquiring the user information data table about the shielded user mobile phone number information 16801001241 recorded by the array U [3] element U [3] UPHNo of the shielded user information structure U, inquiring a Home Subscriber Server (HSS) because the shielded user mobile phone number information does not exist in the user information data table, acquiring the shielded user International Mobile Subscriber Identity (IMSI) information 460001004201241, and storing the shielded user International Mobile Subscriber Identity (IMSI) information in the array U [3] element U [3] UIMSI of the shielded user information structure U;

step S13, according to the information of the International Mobile Subscriber Identity (IMSI) of the masked user in the array U [ i ] element U [ i ] UIMSI of the masked user information structure U, inquiring a Mobile Management Entity (MME) to obtain the information of the unique identifier (MME UE S1AP ID) allocated by the Mobile Management Entity (MME) to the User Equipment (UE) on the S1 link according to the information of the International Mobile Subscriber Identity (IMSI) of the masked user, and storing the information of the unique identifier (MME UE S1AP ID) allocated by the Mobile Management Entity (MME) of the masked user to the User Equipment (UE) on the S1 link into the content of the UMMEID of the array element member of the masked user information structure.

Inquiring a Mobile Management Entity (MME) according to the International Mobile Subscriber Identity (IMSI) information 460001004201239 of the masked user in the array U [1] element U [1] UIMSI of the masked user information structure U to obtain unique identification (MME UE S1AP ID) information 2155872522 which is distributed to User Equipment (UE) by the Mobility Management Entity (MME) on an S1 link according to the International Mobile Subscriber Identity (IMSI) information, and storing the unique identification (MME UE S1AP ID) information 2155872522 which is distributed to the User Equipment (UE) by the Mobility Management Entity (MME) of the masked user on the S1 link into the array U [1] element U [1] UMMEID of the masked user information structure U; the same method obtains 2155872523 recorded in U array U [2] element U [2] UMMEID of the structure of shielding user information U array U [3] element U [3] UMMEID, 2155872524 recorded in UMMEID.

4. Defining a variable Mid1 for storing unique identification (MME UE S1AP ID) information allocated by the Mobility Management Entity (MME) to the User Equipment (UE) on the S1 link in an initialization Context Setup Response (initialization Context Setup Response) signaling; a defined variable Mid2, configured to store unique identifier (MME UE S1AP ID) information allocated by the Mobility Management Entity (MME) to the User Equipment (UE) on the S1 link in the UE Context Modification Response (UE Context Modification Response) signaling;

after the user information shielding structure and the definition variables Mid1 and Mid2 are set, the user is shielded after the user information shielding is identified in the S1-based user call process. The specific implementation process comprises the following steps:

step S21, capturing S1 signaling through the user control plane S1 interface, and screening out an initialization Context Setup Response (initialization Context Setup Response) signaling and a UE Context Modification Response (UE Context Modification Response) signaling.

Since the sequence number of the initialization Context Setup Response (initialization Context Setup Response) signaling in the protocol is 9, and the sequence number of the UE Context Modification Response (UE Context Modification Response) signaling is 21, the two signaling can be screened and distinguished by the sequence number.

Step S22, for the initialization Context Setup Response (Initial Context Setup Response) signaling, extracting the information of the unique identifier (MME UE S1AP ID) distributed to the User Equipment (UE) by the Mobility Management Entity (MME) on the S1 link, and storing the information in the variable Mid 1;

step S23, comparing the unique identifier (MME UE S1AP ID) information allocated to the User Equipment (UE) by the Mobility Management Entity (MME) on the S1 link, which is extracted from the signaling stored in the variable Mid1, with the information in the array U [ i ] element U [ i ]. UMMEID of the shielding user information structure U, where i is 0, 1, 2; if the information stored in the variable Mid1 is the same as the information in the array U [ i ] element U [ i ] of the structure U for shielding user information, executing step S24, and if not, executing step S25;

step S24, blocking the initialization Context Setup Response (Initial Context Setup Response) signaling, and interrupting the original Circuit Switched Fallback (CSFB) call flow of the user, so that the user cannot normally complete the CSFB call signaling flow, thereby achieving the purpose of shielding the CSFB call of the user;

step S25, the initialization Context Setup Response (initialization Context Setup Response) signaling is still transmitted according to the original signaling flow.

Step S26, for the UE Context Modification Response (UE Context Modification Response) signaling, extracting the unique identifier (MME UE S1AP ID) information allocated by the Mobility Management Entity (MME) to the User Equipment (UE) on the S1 link, and storing the information in a variable Mid 2;

step S27, comparing the unique identifier (MME UE S1AP ID) information allocated to the User Equipment (UE) by the Mobility Management Entity (MME) on the S1 link, which is extracted from the signaling stored in the variable Mid2, with the information in the array U [ i ] element U [ i ]. UMMEID of the shielding user information structure U, where i is 0, 1, 2; if the information stored in the variable Mid2 is the same as the information in the array U [ i ] element U [ i ] of the structure U for shielding user information, executing step S28, and if not, executing step S29;

step S28, blocking the UE Context Modification Response (UE Context Modification Response) signaling, and interrupting the original cs domain fallback (CSFB) call flow of the shielded user, so that the user cannot normally complete the cs domain fallback (CSFB) call signaling flow, thereby achieving the purpose of shielding the cs domain fallback call of the user;

step S29, the UE Context Modification Response (UE Context Modification Response) signaling is still transmitted according to the original signaling flow.

When the CSFB call signaling flow in fig. 2, 4, 6, and 8 is performed on the masked subscriber according to the method described in fig. 1, the results are shown in fig. 3, 5, 7, and 9, respectively.

When the shielding user needs to remove the shielding, an instruction is sent out to stop shielding the shielding user removing the shielding, and the signaling flow of the shielding user removing the shielding is processed according to the normal user.

As shown in fig. 2, the initial part of the signaling flow of the circuit switched fallback calling party in the idle state of the normal user includes the following steps:

step 1, RRC connection, i.e. procedure 0 in fig. 3;

step 2, service request, i.e. signaling 1a in fig. 2;

step 3, modifying the user context, namely signaling 1 b-1 c in figure 2;

step 4, user measurement report, namely process 2 in fig. 2;

step 5, releasing the RRC connection, i.e. signaling 3 in fig. 2;

step 6, releasing user context, namely signaling 4-5 in FIG. 2;

and 7, falling back to the circuit domain, namely signaling 6-11 in the figure 2.

As shown in fig. 3, after the user performs circuit switched fallback calling shielding in an idle state based on the S1 signaling, the process of shielding the user circuit switched fallback calling signaling includes the following steps:

step 1, RRC connection, i.e. procedure 0 in fig. 5;

step 2, service request, i.e. signaling 1a in fig. 5;

step 3, UE context modification request message, i.e. signaling 1b in fig. 3;

and step 4, blocking the sending of the initialization Context Setup Response (initialization Context Setup Response) signaling, namely not sending the initialization Context Setup Response (initialization Context Setup Response) signaling to the MME, so that the signaling flow of the circuit switched fallback call of the shielding user is interrupted, and the purpose of shielding the circuit switched fallback call of the shielding user is achieved.

As shown in fig. 4, similarly, the beginning part of the signaling flow of the circuit switched fallback calling party in the user connection state includes the following steps:

step 1, service request, i.e. signaling 1a in fig. 2;

step 2, initializing a user context message, namely signaling 1 b-1 c in FIG. 2;

step 3, user measurement report, namely process 2 in fig. 2;

step 4, releasing the RRC connection, i.e. signaling 3 in fig. 2;

step 5, releasing user context, namely signaling 4-5 in FIG. 2;

and 6, falling back to the circuit domain, namely signaling 6-11 in the figure 2.

As shown in fig. 5, after the screening user performs circuit switched fallback calling call screening based on S1 signaling in the connected state, the signaling flow of the circuit switched fallback calling call in the connected state of the screening user includes the following steps:

step 1, service request, i.e. signaling 1a in fig. 3;

step 2, initializing a UE context request message, namely a signaling 1b in FIG. 3;

and step 3, blocking the sending of the UE Context Modification Response (UE Context Modification Response) signaling, namely not sending an initialization Context Setup Response (Initial Context Setup Response) signaling to the MME, so that the signaling flow for shielding the CS domain fallback conversation of the user is interrupted, and the aim of shielding the CS domain fallback conversation of the user is fulfilled.

As shown in fig. 6, similarly, the signaling procedure for the normal user idle state circuit switched fallback called call includes the following steps:

step 1, called paging initiation, i.e. signaling 1a in fig. 6

Step 2, RRC connection, i.e. process 1b in fig. 6;

step 3, initiating an extended service request, i.e. signaling 1c in fig. 6;

step 4, initializing user context establishment, namely signaling 1 e-1 f in fig. 6;

step 5, user measurement report, i.e. process 2 in fig. 6;

step 6, releasing the RRC connection, i.e. signaling 3 in fig. 6;

step 7, releasing the user context, namely signaling 4-5 in FIG. 6;

and 8, falling back to the circuit domain, namely signaling 6-9 in the figure 6.

As shown in fig. 7, after the shielding user performs circuit switched fallback called call shielding in an idle state based on S1 signaling, the signaling for shielding the called service of the user established includes the following steps:

step 1, called paging initiation, i.e. signaling 1a in fig. 7;

step 2, RRC connection, i.e. procedure 1b in fig. 7;

step 3, initiating an extended service request, i.e. signaling 1c in fig. 7;

step 4, initializing a context establishment request message, namely a signaling 1e in fig. 7;

and step 5, blocking the sending of the initialization Context Setup Response (initialization Context Setup Response) signaling, namely not sending the initialization Context Setup Response (initialization Context Setup Response) signaling to the MME, so that the signaling flow for shielding the circuit switched domain fallback call of the user is interrupted, and the purpose of shielding the circuit switched domain fallback call of the user is achieved.

As shown in fig. 8, similarly, the signaling procedure for the normal user connection state circuit switched fallback called call includes the following steps:

step 1, called paging initiation, i.e. signaling 1a in fig. 8

Step 2, initiating an extended service request, i.e. signaling 1b in fig. 8;

step 3, initializing user context establishment, namely signaling 1 d-1 e in fig. 8;

step 4, user measurement report, i.e. process 2 in fig. 8;

step 5, releasing the RRC connection, i.e. signaling 3 in fig. 8;

step 6, releasing the user context, namely signaling 4-5 in FIG. 8;

and 7, falling back to the circuit domain, namely signaling 6-9 in the figure 8.

As shown in fig. 9, after the shielding user performs circuit switched fallback called call shielding in an idle state based on S1 signaling, the signaling for shielding the called service of the user established includes the following steps:

step 1, called paging initiation, i.e. signaling 1a in fig. 9;

step 2, initiating a service request, i.e. process 1b in fig. 9;

step 3, user context modification request, i.e. signaling 1c in fig. 9

And step 4, blocking the sending of the UE Context Modification Response (UE Context Modification Response) signaling, namely not sending an initialization Context Setup Response (Initial Context Setup Response) signaling to the MME, so that the signaling flow for shielding the call of the user circuit domain is interrupted, and the purpose of shielding the call of the circuit domain is achieved.

Claims

1. A method for shielding a circuit switched domain fallback call based on S1 signaling, the method comprising:

step S23, comparing the unique identification information, which is extracted from the initialization context setup response signaling and allocated to the user equipment by the mobility management entity MME on the S1 link, with the content in the member UMMEID in the array element of the shielding user information structure U, if the unique identification information and the content are the same, executing step S24, and if the unique identification information and the content are different, executing step S25; the user information shielding structure U comprises array element members for representing user information shielding: UPHNo, UIMSI, UMMEID; the member UPHNo is used for recording the mobile phone number information of the screening user, the member UIMSI is used for recording the international mobile subscriber identity IMSI information of the screening user, and the array element member UMMEID is used for recording the unique identification information distributed to the user equipment by the mobility management entity MME of the screening user on the S1 link;

2. The method for screening a cs domain fallback call based on the S1 signaling of claim 1, wherein before the step S21 is executed, the method further comprises:

step S10, creating a user information shielding structure U, and representing three members of the user information shielding structure U by using three array elements in the user information shielding structure U: UPHNo, UIMSI, UMMEID, and storing the structure U in a dedicated server arranged between a base station eNB and a mobility management entity MME;

3. The method for screening a cs fallback session based on S1 signaling according to claim 2, wherein the step S12 comprises:

4. The method for shielding cs domain fallback communication based on the S1 signaling as claimed in claim 2, wherein the step of filling and shielding the information of the user phone number in the step S11 specifically comprises:

5. The method for screening a cs domain fallback call based on the S1 signaling of claim 1, wherein before the step S21 is executed, the method further comprises:

6. The method for screening user circuit switched fallback calls based on the S1 signaling of claim 2, wherein before the step S11 is executed, the method further comprises:

establishing a shielded user number information table, and inputting the mobile phone number information of the shielded user, wherein the number of information items established in the shielded user number information table is the number of the shielded users recorded by the shielded user total number variable Nue, and the serial number of the shielded user in the shielded user number information table is i-0.

And loading the user number shielding information table, wherein the array element members UPHNo of the user information shielding structure U are extracted one by one according to the serial number one by one correspondingly to the mobile phone number information of the shielding user in the user number shielding information table.