WO2005122461A1

WO2005122461A1 - A method for establishing the point-to-point

Info

Publication number: WO2005122461A1
Application number: PCT/CN2005/000833
Authority: WO
Inventors: Zhili Xia; Xiaochun Cui; Minjun Shen; Bo Wang; De Chen
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2004-06-10
Filing date: 2005-06-10
Publication date: 2005-12-22
Also published as: CN1708172A; CN100441030C

Abstract

A method for establishing the point-to-point sets the user identification for the each user terminal in the same Virtual Private Network and the method includes the steps: a) after the network side has received the call setup request message including the calling mobile station and the called mobile station user identification from the calling mobile station, it downwards sends the point-to-point notification message including the calling mobile station and the called mobile station user identification to the area in which the called mobile station is located; b)after the mobile station in the said area in the step a) checks the point-to-point notification message, it matches the user identification in the message with itself identification, if the match is successful, it sends the point-to-point notification response message, then executes the step c); if the match is unsuccessful, end the process; c) after the network side receives the point-to-point notification response message from the called mobile station, it connects the channels configured respectively by the calling mobile station and the called mobile station, and notifies the calling mobile station and the called mobile station to setup the point-to-point connection.

Description

Method for establishing private call

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a method for establishing a private call. Background of the invention

Generally, existing mobile communication systems can implement point-to-point calls. The Global Mobile Communication System (GSM) is taken as an example below to specifically describe the call flow for implementing point-to-point. In order to be able to identify users throughout the public land mobile network (PLMN), a longer phone number is generally required to uniquely identify the user. For example, the current China Mobile mobile phone number is an 11-digit number. When the calling user needs to make a call to another user, he needs to dial the mobile phone number of the other party, and then press the call function key on the terminal to initiate the call. Figure 1 shows the flow chart of the point-to-point call implemented by the existing GSM system.

Steps 101 to 103: The calling mobile station (MS) initiates a communication management (CM) service request message (CM SERVICE REQUEST) to the network side, and the service request message carries a service type for originating call establishment; the network side receives the service After the request message, the calling MS sends a service request response message to the calling MS. After that, the calling MS sends a connection establishment SETUP message to the network side. The message contains the called mobile phone number. The mobile switching center (MSC) on the network side accesses the location register. (VLR) Step 104 is executed after the two mobile phone numbers are successfully signed.

Step 104: After the MSC on the network side finds the location area of the called MS through the VLR, it sends a paging message PAGING REQUEST through the paging channel (PCH) in the location area of the called MS. The paging message includes the called MS. International Mobile Subscriber Identity (IMSI) or Temporary Mobile Subscriber Identity (TMSI). The paging message is sent on the paging channel according to the paging cycle. The paging cycle is usually 1 to 2 seconds. Therefore, the delay of the message is relatively long. Step 105: The MS in the uplink location area determines whether the IMSI or TMSI in the received paging message matches its own MSI or TMSI. If it does not match, no processing is performed, and if it matches, a channel request is sent to the network side. The message CHANNEL REQUEST is used to trigger the allocation process of the initialization channel, and step 106 is continued.

Steps 106 to 111: The called MS responding to the network side sends an immediate assignment channel message IMMEDIATE ASSIGNMENT to start the channel establishment process; the called MS sends a PAGING RESPONSE to the network side by setting an Asynchronous Balanced Mode (SABM) frame Message, the network side sends an Unnumbered Response (UA) message to the called MS for confirmation. After that, the network side sends a setup message SETUP to the called MS. The SETUP contains all the information needed to establish the channel, such as the type of service requested and the calling number. After receiving the SETUP message, the called MS responds to the network side. Call the confirmation message CALL CONFIRMED to confirm the SETUP message. At this point, the required channel has been established between the called MS and the network side.

Steps 112 ~ 115, the called MS sends an alert message ALERTING to the network side to notify the network side that the channel assignment is complete; when the called user goes off-hook, the called MS sends a connection message CO ET to the network side, and the network side receives After this message, a connection response message CONNECT ACKNOWLEDGE is returned to the called MS; after that, a normal point-to-point call is made between the calling and called MSs.

It can be seen from the above process that when a mobile communication system implements a point-to-point call, there are many delays as follows: First, because the user identity is usually long, a long dialing time is required when calling. Secondly, because the paging channel PCH must be applied when the network sends a paging message during the paging process, its paging cycle determines a long paging delay. Finally, after the user receives the page, the response process is more complicated, including channel establishment, user ringing, user response, user ringback tone, and user off-hook. Therefore, the delay of the page response is also long.

Although the above-mentioned mobile communication system can implement point-to-point calls, because its implementation process is relatively It is complicated and has a long delay, so it is difficult to meet the requirements of timely communication for special groups, such as police, firefighters, warehouse administrators, and property security. At the same time, since the above-mentioned mobile communication system applies the full-duplex mode, it needs to occupy a lot of wireless resources.

PTT (Put to talk) is a push-to-talk voice service, that is, a half-duplex voice service that realizes communication by holding down a function key. There are many ways to achieve this business. The most basic service provided by PTT is the Voice Group Call Service (VGCS). VGCS allows a call to be established between a group of users belonging to a preset group call area and a group identification (ID). This service uses a half-duplex mode. During the call, any of the spirits in a group can become a speaker, but only one speaker is allowed at any time, and other members are listeners. The preset group call area consists of several cells that belong to the same mobile switch (MSC) or different MSCs. Each relevant cell has a group call channel when calling, and the current speaker uses the uplink group call service channel (TCH), that is, the group Transmit mode, all listeners use downlink TCH, which is the group receive mode. A notification message for group call channel configuration is broadcast on a notification channel (NCH). Since users in the same cell share one downlink channel, the application of VGCS greatly saves radio resources.

Although the above half-duplex voice service has a fast call establishment speed and greatly saves wireless resources, the location of the speaker or listener is relatively fixed, and only one-to-many calls can be realized, and point-to-point calls cannot be realized. Therefore, it cannot meet the user's requirements for call privacy. Summary of the invention

In view of this, the main object of the present invention is to provide a method for establishing a private call, which can not only enable the caller and the called user to quickly establish a connection to realize a private point-to-point call, but also save wireless network resources.

According to the above purpose, the main technical solution of the present invention is implemented as follows:

A method for establishing a private call is to set a user identity for each user terminal belonging to the same virtual private network. The method further includes the following steps: a. After receiving the call establishment request message including the user identity of the called and mobile station from the calling mobile station, the network side sends a private call notification message including the user identity of the called and mobile station to the location area of the called mobile station;

b. After detecting the private call notification message, the mobile station in the location area described in step a matches the user identification in the message with its own identity. If the matching is successful, it sends a private call notification response message to the network side, and then executes Step c; if the match is unsuccessful, the process ends;

c. After receiving the private call notification response message from the called mobile station, the network side connects the group call service channel configured by the network side for the called and called mobile stations respectively, and notifies the calling mobile station to establish privacy with the called mobile station. Call connected.

The private notification message in step a further includes configuration information of a group call service channel allocated for the called mobile station;

Step c further includes: the called mobile station monitors the allocated group call service channel according to the configuration information in the private notification message.

After receiving the private call notification response message from the called mobile station at the network side in step c, the method further includes:

cl. The network side sends configuration information of the group call service channel allocated for the called mobile station to the called mobile station;

c2. The called mobile station monitors the allocated group call service channel according to the configuration information.

The user identifier includes a virtual private network identifier and a virtual private network internal identifier. In step a, the network side sends a private call notification message to the location area of the called mobile station through the notification channel;

The mobile station detects the private call notification message through the notification channel in step b.

The location area of the called mobile station in step a is the location register accessed by the network side.

Query in VLR. The process of connecting the group call service channels respectively configured by the calling and called mobile stations as described in step C is: according to the private call notification response message sent by the called mobile station, the network side determines whether the calling and called mobile stations belong to the same cell,

If the called mobile station and the calling mobile station are in the same cell, the network side allocates the same group call service channel resource to the calling mobile station and the called mobile station;

If the calling mobile station and the called mobile station are located in different cells, the network side allocates group call service channel resources to the calling and called mobile stations in their respective cells. The group call service is connected.

The calling and called mobile stations forcibly occupy the uplink group call service channel in a push-to-talk PTT mode.

The method further includes a process of converting the calling mobile station to a private listener:

d. The calling mobile station sends a release of the uplink voice service channel of the calling mobile station to the network side. e. The network side assigns the calling mobile station to the downlink voice service channel and sends a group call transmission mode dedicated release message to the calling mobile station. ;

f. After receiving the message, the calling mobile station converts into a private listener to listen to the voice group call channel, and returns a response to the release message to the network side.

After the network side receives the private call establishment request message including the user identity of the calling and called mobile station from the calling mobile station, the network side further includes: the network side checks whether the calling and called user identity in the message has successfully signed up for privacy If yes, continue to step b, otherwise end this process directly.

The call setup request message of the calling mobile station described in step a is sent to the network side through a pre-assigned independent dedicated control channel or a pre-assigned group call service.

In step c, the voice service channel allocated to the called mobile station is allocated through the mode modification signaling CH-MOD-MODFY, or is allocated through the independent dedicated control channel SDCCH; In step C, the voice traffic channel is allocated to the calling mobile station when the network side receives the call establishment request message and the network side allocates the calling mobile station.

Applying the present invention, after the network side receives a call setup request message containing the user identity of the calling MS from the calling MS, it sends a private call notification message containing the user identity of the calling MS to the location area of the called MS through the NCH. ; After the MS in the location area of the called party detects the private call notification message through the NCH, it matches the user identity in the message with its own identity. If the match is unsuccessful, no processing is performed and the process ends. If successful, the corresponding channel is monitored according to the channel matching information, and a private call notification response message is sent to the network side. At the same time, the upper and lower industry TCHs are configured for the called and called MS. Then the network side notifies the calling MS to establish a private call with the called MS. connection. The application of the method of the invention has the following advantages:

First, short numbers can be used for communication between user terminals within the same VPN, making calls more convenient.

Secondly, there is no delivery cycle for the NCH channel, and data is delivered every frame. Therefore, compared to PCH paging, a delay in paging delivery is avoided.

Again, the called MS only needs to respond to the network once, and the calling party can speak without the corresponding ringback tone, off-hook, etc. It is very fast and suitable for professional users, such as police officers and firefighters.

Finally, because the same VPN user terminal is usually within a fixed range and can be covered by a single cell, a pair of uplink and downlink channel resources can be saved in a half-duplex manner, which saves wireless network resources.

By applying the method of the present invention, users in the same VPN communicate with each other more conveniently, quickly, and efficiently. Brief description of the drawings

Figure 1 is a schematic diagram of the process of implementing a point-to-point call in the existing GSM system.

FIG. 2 is a schematic flowchart of implementing a private call by applying the present invention.

FIG. 3 is a signaling flowchart of the present invention for immediately assigning a private call through an independent dedicated control channel (SD).

FIG. 4 is a signaling flowchart for establishing a private call through TCH instant assignment according to the present invention.

FIG. 5 is a signaling flowchart for establishing a private call with improved performance of the present invention. Mode of Carrying Out the Invention

In order to make the objectives, technical solutions, and advantages of the present invention clearer and clearer, the following describes the present invention in further detail with reference to the embodiments and the accompanying drawings.

The present invention is mainly directed to users in the same group or the same group, and users in the same group or the same group must belong to the same virtual private network (VPN).

The idea of the present invention is: a half-duplex mode is used to implement a private call (Point to Point PTT), that is, a special PTT call is implemented between two MSs within the same group. By applying the method of the present invention, the user can talk by holding down the FTT button, and can only listen by releasing the PTT button. That is, the calling MS is in the group call sending mode, and the called MS is in the group call receiving mode. When the calling parties are in the same cell, both parties share the downlink channel of the service channel (TCH), and the TCH uplink channel is contended by the PTT method. When the calling parties are in different cells, one wireless channel is occupied respectively, and the party is still Fight for the right to speak through PTT.

In order to minimize the delay between the calling and called MSs in the same group or group and quickly establish a connection, it is necessary to set a user identity for the MSs in the same group or group. The user ID is composed of a VPN ID and a VPN internal ID, that is, a user short number. In this way, when the calling MS needs to initiate a call to another MS in the VPN, it can directly dial the internal ID of the other party, that is, the user's short number, and then press the call function key on the calling MS terminal. FIG. 2 is a schematic flowchart of implementing a private call by applying the present invention.

Step 201: The calling MS sends an IMMEDIATE SETUP message to the network side, that is, a private call message is established, and the message includes the calling and called VPN identifiers, and the calling MS's VPN internal identifier, that is, the calling MS's own The short number of the user and the VPN internal identification of the called MS are the short number of the called MS, and the MSC on the network side detects the above two short numbers of users through VLR, and then executes step 202.

Step 202: After the MSC on the network side finds the location area of the called MS through the VLR, it sends a private call notification message (PTP NOTIFICATION REQUEST) through the NCH channel in the location area of the called MS to start the channel establishment process. Because the NCH channel has no delivery cycle, each frame of data is delivered. The above private call notification message includes the VPN ID, the internal VPN ID of the calling MS, which is the user's short number of the calling MS itself, and the internal VPN ID of the called MS, which is the user's short number of the called MS. At the same time, the message also contains It may or may not include the TCH configuration information to be applied by the called MS.

Multiple cells are usually included in the same location area. Therefore, MSs in multiple cells that belong to the same location area as the called MS will receive the point-to-point call notification message sent through the CH channel.

Steps 203 to 204: The MSs in the multiple cells determine whether the VPN ID and the VPN internal ID of the called MS received in the paging message on the NCH channel match their own VPN ID and internal VPN ID. If they do not match, It is not processed. If they match, when the paging message contains the configuration information of the TMS to be applied by the called MS, the corresponding TCH is monitored according to the information in the message; when the paging message does not contain the configuration information of the TMS to be applied by the called MS, the network is sent to the network. The side sends a private call notification response message (FTP NOTIFICATION RESPONSE), requesting TCH allocation, and the network side issues TCH configuration information to the called MS, and the called MS monitors the corresponding TCH according to the TCH configuration information.

The network side judges the response between the called MS and the calling MS according to the response message of the called MS. Location relationship. If the called MS and the calling MS are in the same cell, the network side allocates the same uplink and downlink TCH channel resources to the calling MS and the called MS. The calling and called MS competes for the TCH uplink channel in the PTT mode. Grab; thus achieve resource sharing. If the calling MS and the called MS are in different cells, the network side allocates uplink and downlink TCH channel resources to the calling MS and the called MS in the respective cells. The two parties are still fighting for the right to speak through PTT.

Steps 205 to 206: The network side sends a connection CONNET message to the calling MS to notify the calling MS that the called MS has been connected, and the calling and called MSs complete the process of establishing a private call to achieve a private call.

Hereinafter, the present invention will be described with specific examples.

FIG. 3 is a signaling flowchart for establishing a private call through SD immediate assignment according to the present invention. The paging message described in FIG. 3 does not include the configuration information of the TMS to be applied by the called MS. Both the cell where the called MS is currently located belong to the same base station subsystem (BSS), and the specific steps are as follows:

Steps 300 to 301: When the calling MS initiates a private call, it sends a channel request message (RACH (CHAN-REQ)) to the BSS, and the BSS returns an immediate channel assignment message (IMM-ASS).

Steps 302 to 304: The calling MS sends a complete layer three message (SABM (IMMEDIATE-SETUP)) to the BSS on the assigned channel. The service type carried in this message is a private call and carries the reference of the private call. The private call reference includes the VPN identity of the private call, the VPN internal identity of the calling and called MS, and the calling MS identity, that is, the IMSI or TMSI of the calling MS; the BSS reports the IMMEDIATE-SETUP message to the MSC. The message carries all the information in the complete layer three message sent by the calling MS. At the same time, the BSS returns a response (UA (IMMEDIATE-SETUP)) to the calling MS that the complete layer three message was received.

Step 305: The MSC performs a standard authentication and encryption process (Authentication & Ciphering) on the private call. If the authentication is successful, go to step 306; otherwise, End this process.

The authentication process of the MSG is: judging whether the calling and called MSs have signed a private call service and whether the calling and called MSs are the same according to the information carried by the IMMEDIATE-SETUP — VP

Steps 306 to 307: The MSC sends a TCH message (VPCS-ASS-REQ) in the cell where the calling MS is located to the BSS. The message uses a delay assignment strategy, that is, the TCH is not allocated to the cell where the calling MS is located. The BSS sends the MSC to the MSC. After receiving the response (VPCS-ASS-COMP) of this message, temporarily no TCH is assigned to the calling MS.

Step 308: The MSC sends a calling MS assignment request message (ASS-REQ) to the BSS. The message is used to assign an SD dedicated connection to the calling MS. The message carries the private call reference and voice (Talker) cells.

Steps 309 to 311: The BSS sends an assignment command message (ASS-CMD) to the calling MS on the SD dedicated connection. The calling MS establishes a TCH according to the command, and returns an assignment completion message (ASS-CMP) to the BSS. The MSC returns an assignment complete message (ASS-CMP).

Step 312: The MSC sends a connectionless private paging request message (BSSMAP-VPCS-PAGING) to the BSS.

Step 313: The BSS performs a private notification (NotIFICATION (No Chan Descript)) on the notification service channel (NCH). The private notification includes the reference of the private call, but does not include the TCH description information allocated by the calling MS.

Step 314: The called MS monitors the NCH channel. If the private call is monitored to paging the called MS, it sends a TCH establishment request (RACH (CH-REQ)) to the BSS through the NCH.

The called MS decides whether to send a TCH request based on whether the private call VPN ID, the called VPN internal ID, the VPN ID stored in advance, and the called VPN internal ID match in the private call group call reference.

Step 315: The BSS immediately assigns an SD channel (IMM-ASS) to the called MS. Step 316: The called MS sends a private notification response (SABM (VPCS-NOTIFICATION-RESPONSE)) to the BSS on the assigned SD channel, and the BSS forwards the response to the MSC (VPCS-NOTIFICATION-RESPONSE).

Step 317: The MSC sends a talkable message (CONNECT) to the calling MS. Steps 318 to 319: The MSC sends an assignment request message (VPCS-ASS-REQ) to the called MS to the BSS. The message includes the private call reference and the TCH description information of the calling MS, but does not include the Talker cell. The BSS is in the network. The side establishes a TCH link between the calling MS and the called MS according to the assignment request message, and returns a response (VPCS-ASS-COMP) that received the message.

Steps 320 to 323. The MSC sends an assignment request message (ASS-EQ) to the BSS, and assigns the called MS to the TCH channel of the assigned called MS. The MSC sends a message to release the SD channel to the called MS (CHAN -RELEASE (TCH)), this message is carried to the TCH allocated by the called MS, the called MS releases the SD channel, enters the group call receiving mode through the allocated TCH, and sends a response (DISC) to the BSS to release the SD channel, BSS Send the response of the assignment request message to the MSC (ASS-COMP

Steps 324-325: The calling MS releases the uplink TCH to become a listener, and sends a dry release uplink TCH channel message (UPLINK-RELEASE) to the BSS, and the BSS sends the MSC to release the calling MS uplink TCH channel message (UPLINK-RELEASE-IND). ).

Steps 326-329: The MSC sends an assignment request message (ASS-REQ) to the BSS, and assigns the calling MS to the downlink TCH channel. The BSS sends a TCH group call sending mode dedicated connection release message (CHAN-RELEASE) to the calling MS. (TCH)). This message carries the TCH channel information allocated to the calling MS. The calling MS enters the group call reception mode. The calling MS sends a response to the release message (DISC) to the BSS. The BSS sends an assignment request message to the MSC. Response (ASS-COMP).

FIG. 4 is a signaling flow chart for establishing a private call through TCH instant assignment according to the present invention. The process described is basically the same as the process described in FIG. 3, except that steps 309 and 310 in FIG. 3 are different from steps 409 and 410 in FIG. 4:

Step 409: The BSS sends a mode modification message (CH-MOD-MODFY) to the calling MS on the TCH dedicated connection that the calling MS has established. The message carries a private call reference and a voice (Talker) cell.

Step 410: The calling MS returns a confirmation message (CH-MOD-MODFY-ACK) of the message to the BSS.

Since this method does not need to establish an SD channel for message interaction between the calling MS and the BSS, and directly uses the TCH channel already established by the calling MS to perform message interaction with the BSS, the performance is slightly better than the process described in FIG. 3 Excellent, the performance improvement is about 100 milliseconds.

FIG. 5 is a signaling flowchart for establishing a private call with improved performance according to the present invention. As shown in the figure, when the MSC receives a full layer three message in step 304, and detects that the full layer three message is a call of the private call type, first, Step 313 is performed, and then step 305 and subsequent steps are sequentially performed, so that the MSC can obtain the notification response from the called MS more quickly, so as to improve the performance of the private call. When the calling MS and the called MS belong to the same cell, FIG. 5 also omits steps 318 and 319, and does not need to establish a connection between the TCH channel of the calling MS and the TCH channel of the called MS, but directly uses the address allocated to the calling MS. TCH uplink and downlink can realize the private call between the calling and called MS.

With performance of the signaling flow of FIG. 5 establishing the private call, private call setup performance increased to about 100 ~ 150MS _o

The above descriptions are merely preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the present invention. Within the scope of protection.

Claims

Claim

1. A method for establishing a private call, characterized in that a user identifier is set for each user terminal belonging to the same virtual private network, and the method further includes the following steps:

a. After receiving the call establishment request message including the user identity of the called and mobile station from the calling mobile station, the network side sends a private call notification message including the user identity of the called and mobile station to the location area of the called mobile station;

b. After detecting the private call notification message, the mobile station in the location area described in step a matches the user identification in the message with its own identity. If the matching is successful, a private call notification response message is sent to the network side, and then executed. Step c; if the match is unsuccessful, the process ends;

2. The method according to claim 1, wherein the privacy notification message in step a further comprises configuration information of a group call service channel allocated for the called mobile station;

3. The method according to claim 1, wherein after the network side in step c receives the private call notification response message from the called mobile station, the method further comprises:

4. The method according to claim 1, wherein the user identifier includes a virtual There are two parts, the private network identity and the virtual private network internal identity.

5. The method according to claim 1, wherein, in step a, the network side sends a private call notification message to a location area of the called mobile station through a notification channel;

6. The method according to claim 1, wherein, in step a, the location area of the called mobile station is queried by the network side from the access location register VLR.

7. The method according to claim 1, characterized in that, in step c, the group call service of the calling and called mobile stations is configured separately [the process of connecting is: according to the private call sent by the called mobile station A notification response message, the network side determines whether the calling and called mobile stations belong to the same cell,

8. The method according to claim 7, characterized in that the calling and called mobile stations use the talk-to-talk PTT method to preempt the uplink group call service.

9. The method according to claim 1, further comprising a process of converting the calling mobile station into a private listener:

d. The calling mobile station sends a message of releasing the uplink voice service channel of the calling mobile station to the network side;

e. The network side assigns the calling mobile station to the downlink voice service channel, and sends a group call sending mode dedicated release message to the calling mobile station;

10. The method according to claim 1, wherein in step a, the network side receives a private call establishment request message from the calling mobile station including the user identity of the calling and called mobile stations, and further comprises: The side checks whether the calling and called user identifications in the message have successfully signed up for a private call, and if so, proceeds to step b, otherwise ends the process directly.

11. The method according to claim 1, wherein the call establishment request message of the calling mobile station in step a is sent to the network side on a pre-assigned independent dedicated control channel or a pre-assigned group call service channel. of.

12. The method according to claim 1, characterized in that, in step c, the voice industry is assigned to the called mobile station by way of mode modification signaling CH-MOD-MODFY, or through an independent dedicated control channel. SDCCH allocated;

The allocation of the voice traffic channel to the calling mobile station as described in step c is allocated to the calling mobile station when the network side receives the call establishment request message.