CN1332575C - Method for identifying speaker in group call - Google Patents

Abstract

The present invention discloses a method for identifying speakers in a group call, which comprises the following steps: 1), in the occupying process of an uplink channel in a group call, after a mobile station MS receives an uplink occupying request response returned by base station subsystems BSS, the MS sends a message which comprises identity information to the BSS; 2), after the BSS receives the message which comprises the identity information, the message is forwarded to a mobile switching center MSC; 3), the MSC analyzes the identity information of a speaker MS in the sent message in the step 2), and searches an MSISDN of a user according to the identity information; after a proper speaker is selected, the MSC sends down the searched MSISDN to all the BSS; 4), all the BSS sends the received MSISDN to the MS of a group which the MS is in. By using the method of the present invention, a user can directly know the identity of the speaker in a current group through the MS; moreover, system hardware does not need changing for simple realization.

Description

How to Identify the Talking Party in a Group Call

technical field

The invention relates to a group call service of a digital trunking wireless communication system, in particular to a method for identifying a speaking party in a group call.

Background technique

Digital trunking wireless communication system is a relatively economical and flexible command and dispatch communication system developed in recent years. It is widely used in government agencies, energy transportation, airport terminals, industrial and mining enterprises, fire police, water conservancy and military units. Meet the internal communication needs of each unit.

The most basic service provided by the trunking system is the Voice Group Call Service (VGCS). VGCS allows users to establish a call to a group of users belonging to a given service area and group ID. The service is provided in half-duplex mode. During the call, any member can become a speaker, but only one speaker is allowed at any time , the other members are listeners. The service area can be composed of several cells belonging to the same MSC or different MSCs. When calling, each relevant cell has a group call channel, in which the uplink is only used by the current speaker, that is, the current speaker is in group transmission mode; all listeners Watching is on the downlink, that is, all listeners are in the group receiving mode; the notification message configured by the group call channel is broadcast on the notification channel (NCH). Since users in the same cell share one downlink channel, wireless resources are greatly saved and spectrum utilization efficiency is improved.

Refer to FIG. 1 for the structure of the core network of the cluster system, which is a schematic diagram of the structure of the core network of the cluster system in the prior art. Among them, the home location register (HLR) 102 stores user information, including the user's International Mobile Subscriber Identity (IMSI), the ISDN number (MSISDN) of the mobile station, and the group ID list to which the user belongs. Usually, a user can belong to 50 users at most. Group.

A gateway mobility switch (GMSC) 103 is connected to the external network 101, and the GMSC is also connected to an anchor mobility switch (Anchor MSC) 103.

Anchor MSC 103 is responsible for managing and maintaining a specific VGCS.

Relay MSC (Relay MSC) 107 is all MSCs except the anchor MSC when the group call area spans multiple MSCs. There is a one-to-many tree relationship between the anchor MSC105 and the relay MSC107.

The visitor location register (VLR) 104 stores the user's IMSI, MSISDN, and the ID list of the group to which the user belongs. When the user roams, these information are copied from HLR102. VLR104 copies the user's IMSI, MSISDN and the group ID it belongs to from HLR102, assigns a temporary mobile subscriber identification number (TMSI) for the user entering the location area, and releases its information for the user who roams away from the location area. The user who fails to update the location for a long time sets the user's status as IMSI separation, and the VLR is directly connected to the MSC and the group call register (GCR) in its area.

The group call register (GCR) 106 includes a group ID and a group call area, and the combination of the group call area and the group ID is called a group call reference. The GCR 106 connected to the anchor MSC 105 includes a dispatcher list, a relay MSC list, and a cell list directly controlled by the anchor MSC related to the group call reference. The GCR 106 connected to the relay MSC 107 contains the address of the anchor MSC related to the group call reference and the list of cells controlled by the relay MSC.

When receiving the group call initiation request, the anchor MSC 105 queries the connected GCR 106 for the group attributes. Obtain dispatcher list, relay MSC list, and cell list under the control of this MSC. Then call the dispatcher, call the relay MSC107 and set up a group call channel in the cell under the control of this MSC, notify the users in the group through the NCH of each cell that the group call is initiated, and specify its group call channel so that the users in the group can monitor it.

After the relay MSC107 receives the group call request from the anchor MSC105, it queries the connected GCR106 for the list of cells, establishes group call channels in these cells, notifies the users in the group of group call initiation through the NCH, and specifies its group call channel for group calls. Internal user monitoring.

It can be seen from the above group call process that since the group call is established based on the group ID, the network side only uses the group call ID as the call identifier during the call, and does not know the status of each user in the group. Even if a certain user seizes the uplink channel and becomes the speaker, other users in the group can hear the speech, but they do not know the identity of the speaker, because the network side does not send the identity of the speaker to all listeners .

In the group call business process described in GSM Phase2+, there is no method for sending the speaker ID to other users and the corresponding message support. Referring to Fig. 2, Fig. 2 is the prior art group call uplink channel preemption process, which process includes the following steps:

Step 1, the base station subsystem (BSS) periodically sends this message on the group call channel FACCH, indicating that the current uplink channel of the mobile phone is idle (UPLINK_FREE).

Step 2, when the mobile station (MS) wants to seize the uplink channel, it sends a request to occupy the uplink channel message (UPLINK_ACCESS) to the BSS. The message is sent through the uplink of the group call channel, indicating that the user requests to occupy the uplink channel, carrying the access reason and random reference information.

In step 3, the BSS sends an uplink request (UPLINK_REQUEST) to the anchor MSC (MSCA), and each BSS only needs to send one.

Step 4: After the BSS passes the preemption decision, it returns an uplink occupation response message (VGCS_UPLINK_GRANT) to the MS. Here, in order to save time, the BSS does not wait for the confirmation uplink request message (UPLINK_REQ_ACK) sent by the anchor MSC, but returns VGCS_UPLINK_GRANT directly to the MS. The message responds to the uplink occupation request, including the synchronization information (physical information) of the mobile station and the network, and the uplink access preemption resolution (random reference). After the MS receives the message, it can start talking.

Step 5: The BSS sends an uplink channel busy message (UPLINK_BUSY) on the downlink of the group call channel to notify all MSs in the cell that the current uplink channel is busy.

Step 6. The MS receiving VGCS_UPLINK_GRANT confirms whether it has seized the uplink channel according to whether the random reference information contained in the message is the same as the random reference information sent by itself, and sends a set asynchronous balance mode (SABM, Set Asynchronous Balance Mode) to the BSS message, which is a Layer 2 link establishment and Layer 3 message (L3 MSG).

Step 7, the anchor MSC sends UPLINK_REQ_ACK to the BSS. After selecting a suitable speaker, the uplink occupation is successful, and the anchor MSC will also send an UPLINK_SEIZED message to other BSSs to notify that the uplink is busy.

In step 8, the BSS sends a UA (L3 MSG) message to the MS requesting to preempt the uplink channel, which is a layer 2 link establishment confirmation and a layer 3 response message including contention resolution information.

Step 9: If the anchor MSC knows that other BSSs occupy the uplink channel at this time, the anchor MSC sends a reject uplink request message (UPLINK_REJECT) to the BSS to reject the uplink request, and the process ends after performing step 10.

In step 10, the BSS starts the uplink release procedure, and sends an uplink channel release message (UPLINK_REL) to the MS requesting to preempt the uplink channel.

In step 11, other MSs in the BSS send an UPLINK_BUSY message to notify that the uplink channel is busy.

In step 12, the BSS sends an uplink channel preemption success message (BSSUPLINK_REQ_CNF) to the anchor MSC.

In step 13, the anchor MSC sends a message (FORWARD_GROUP_CALL_SIGN) that the uplink channel is occupied to all relay MSCs (MSC_R) to notify that the uplink has been occupied.

In this process, the network side does not know the IMSISDN number of the mobile station that seizes the uplink channel (speaker), and of course it does not send it to other users. That is to say, the user cannot know which user is currently speaking through the MS. However, for users who are accustomed to point-to-point calls that provide the calling party number identification and display functions, this point seems to be lacking.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for identifying the speaker in a group call. The network side can send the speaker ID to other listeners in the group, so that the user can know who is currently speaking through the MS. which user.

In order to achieve the above object, the technical solution of the present invention is specifically realized in the following way:

A method for identifying a speaking party in a group call, the method comprising the following steps:

1) In the group call uplink channel preemption process, the mobile station MS sends a message including identity information to the BSS after receiving the uplink occupation request response returned by the base station subsystem BSS;

2) After the BSS receives the message containing the identity information, it forwards the message to the mobile switching center MSC;

3) The MSC analyzes the identity information of the speaker MS in the message sent in step 2), and searches for the user's mobile station ISDN number MSISDN according to the identity information. After selecting a suitable speaker, the MSC will find the MSISDN issued to all BSS;

4) The BSS sends the received MSISDN to the MS in the group to which the MS belongs.

Wherein, the message including the identity information described in step 1) may be a SABM message.

The identity information may be an International Mobile Identity IMSI or a Temporary Mobile Identity TMSI.

The step 3) may include:

31) After the anchor MSC or the relay MSC receives the uplink channel request from the MS in the local MSC, if the MS is allowed to access, it will query in the home location register HLR or the visitor location register VLR of the local MSC according to the IMSI or TMSI of the MS. The MSISDN of the MS, and send the query result to the anchor MSC;

32) After the anchor MSC selects a suitable speaker, it sends the MSISDN and IMSI or TMSI of the speaker MS to all relay MSCs;

33) The relay MSC sends the found MSISDN to all BSSs.

Described step 3) also can comprise:

3a) After the anchor MSC or the relay MSC receives the uplink channel request from the MS in the MSC, if the MS is allowed to access, send the IMSI or TMSI of the MS to the anchor MSC;

3b) After the anchor MSC selects a suitable speaker, it determines the MSC where the speaker MS is located, and requests the MSC to query the MS's MSISDN;

3c) The MSC that receives the request to inquire about the MSISDN, goes to the HLR or VLR of the MSC to inquire about the MSISDN of the MS according to the IMSI or TMSI of the MS, and sends the inquiring result to the anchor MSC;

3d) The anchor MSC sends the MS's MSISDN and its IMSI or TMSI in the query result to all relay MSCs;

3e) The relay MSC sends the found MSISDN to all BSSs.

Step 3) The MSC sends the MSISDN of the MS it recognizes to all BSSs, which can be sent through the uplink captured UPLINK SEIZED message.

Step 4) The method for the BSS to send the received MSISDN to the MS in the group where the MS is located may be: the BSS sends the speaker identification including the MSISDN of the speaker through the group call channel FACCH of the downlink voice group call service VGCS channel TALKER MSISDN message to all MSs in the group.

The BSS may repeatedly send the TALKER MSISDN message including the MSISDN of the speaker.

The method may further include: the MS notifies the user of the MSISDN using the calling party number identification and display function of the existing MS.

It can be seen from the above technical solution that in the method for identifying the speaking party in the group call of the present invention, the message sent by the MS to the network side must contain identity information, and the network side searches for the user's MSISDN according to the identity information of the speaker. Then the network side directly sends the MSISDN of the speaker MS to other listening MSs through the air interface message, so that the user can know which user is currently speaking through the MS, and the implementation is simple.

Description of drawings

FIG. 1 is a schematic diagram of the core network structure of the prior art cluster system;

Fig. 2 is the prior art group call uplink channel preemption process;

Fig. 3 is a group call uplink channel preemption process of a preferred embodiment of the present invention;

Fig. 4 is a schematic diagram of the process of the MSC querying the MSISDN in the embodiment shown in Fig. 3 .

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. That

In order to realize speaker identification in the present invention, the message sent by MS to the network side must contain IMSI or TMSI, and the network side searches the user's MSISDN according to the speaker's identity information, such as IMSI or TMSI, and then the network sends the speaker's MSISDN send to other users. Other MS listening to the user can use the caller number identification and display function of the existing MS to notify the user of the MSISDN.

After the mobile terminal supporting the VGCS service presses a push-to-talk (PTT) key, it executes a PTT preemptive access process. Referring to Fig. 3, Fig. 3 is the group call uplink channel preemption process of a preferred embodiment of the present invention, and this process includes the following steps:

Step 1, the base station subsystem (BSS) periodically sends this message on the group call channel FACCH, indicating that the current uplink channel of the mobile phone is idle (UPLINK_FREE).

Step 2, when the mobile station (MS) wants to seize the uplink channel, it sends a request to occupy the uplink channel message (UPLINK_ACCESS) to the BSS. The message is sent through the uplink of the group call channel, indicating that the user requests to occupy the uplink channel, carrying the access reason and random reference information.

In step 3, the BSS sends an uplink request (UPLINK_EQUEST) to the anchor MSC (MSC_A), and each BSS only needs to send one.

Step 4: After the BSS passes the preemption decision, it returns an uplink occupation response message (VGCS_UPLINK_GRANT) to the MS. Here, in order to save time, the BSS does not wait for the confirmation uplink request message (UPLINK_REQ_ACK) sent by the anchor MSC, but returns VGCS_UPLINK_GRANT directly to the MS.

Step 5: The BSS sends an uplink channel busy message (UPLINK_BUSY) on the downlink of the group call channel to notify all MSs in the cell that the current uplink channel is busy.

Step 6: The MS that receives the VGCS_UPLINK_GRANT confirms whether it has preempted the uplink channel according to whether the random reference information contained in the message is the same as the random reference information sent by itself, and sends a SABM (L3 MSG) message to the BSS, which is a layer Two link establishment and layer three messages. In this embodiment, the MS uploads a talker identification (TALKER INDICATION) message in a SABM (L3 MSG) message frame. The message must include the IMSI or TMSI of the mobile station.

Step 7, BSS sends the TALKER INDICATION message to the anchor MSC.

Step 8, the anchor MSC sends UPLINK_REQ_ACK to the BSS.

The MSC parses out the IMSI or TMSI of the speaking party in the TALKER INDICATION message, searches for the corresponding MSISDN in the home location register/visitor location register (HLR/VLR) according to the IMSI or TMSI, and selects a suitable speaker, the uplink occupies If successful, the anchor MSC sends UPLINK_REQ_ACK to the BSS. The anchor MSC sends the MSISDN containing the approved user to the relay MSC, and the relay MSC sends the MSISDN to other BSSs through an UPLINK_SEIZED message to notify that the uplink is busy.

In step 9, the BSS sends a UA (L3 MSG) message feedback confirmation to the MS requesting to preempt the uplink channel, which is a Layer 2 link establishment confirmation and a Layer 3 response message including contention resolution information.

Step 10, each BSS sends a TALKER MSISDN message containing the MSISDN of the mobile station to all MSs in the group. The BSS can send a message TALKER to all users in the group through the FACCH channel of the downlink VGCS channel. The message includes the MSISDN of the speaking party to realize the identification of the speaking party, that is, the caller ID function. The BSS can send repeatedly for receiving, but because the MSISDN has more bytes, it cannot send continuously.

Step 11, if the anchor MSC learns that other BSSs occupy the uplink channel at this time, the anchor MSC sends a reject uplink request message (UPLINK_REJECT) to the BSS to reject the uplink request, and the process ends after performing step 12.

In step 12, the BSS starts the uplink release procedure, and sends an uplink channel release message (UPLINK_REL) to the MS requesting to preempt the uplink channel.

In step 13, the BSS sends an UPLINK_BUSY message to other MSs to notify that the uplink channel is busy.

In step 14, the BSS sends an uplink channel preemption success message (BSSUPLINK_REQ_CNF) to the anchor MSC.

Step 15, the anchor MSC sends a message (FORWARD_GROUP_CALL_SIGN) that the uplink channel is occupied to all relay MSCs (MSC_R) to notify that the uplink has been occupied.

In this embodiment, two mobile application part (MAP) message primitives need to be added to realize querying the MSISDN, one is that the MSC queries the user's MSISDN (according to IMSI or TMSI) from the HLR, and the other is that the HLR feeds back the query result to the MSC. Referring to FIG. 4 , FIG. 4 is a schematic diagram of the process of the MSC querying the MSISDN in the embodiment shown in FIG. 3 . Wherein, the MAP user MSISDN query primitive includes the IMSI or TMSI of the queried user, and the MAP user MSISDN response primitive includes the query result.

There are two methods of querying MSISDN in practical applications:

The first one, MSC first inquires the MSISDN and then selects the appropriate speaker, including the following steps:

Step 1: After the anchor MSC or the relay MSC receives the uplink channel request from the MS in the local MSC, if the MS is allowed to access, then in the home location register HLR or the visitor location register VLR of the local MSC, according to the IMSI or TMSI of the MS Query the MSISDN of the MS, and the HLR or VLR sends the query result to the anchor MSC;

Step 2: After the anchor MSC selects a suitable speaker, it sends the MSISDN and IMSI or TMSI of the speaker MS to all relay MSCs;

In step 3, the relay MSC sends the found MSISDN to all BSSs.

The second method is that MSC first selects a suitable speaker and then queries MSISDN, including the following steps:

Step 1: After the relay MSC receives the uplink channel request of the MS in the local MSC, if the MS is allowed to access, it sends the IMSI or TMSI of the MS to the anchor MSC; when the anchor MSC receives the uplink channel request of the MS in the local MSC After the request, if the MS is allowed to access, then directly perform step 2;

Step 2: After the anchor MSC selects a suitable speaker, it determines the MSC where the speaker MS is located, and requests the MSC to query the MS's MSISDN;

Step 3: The MSC that receives the request to query the MSISDN goes to the HLR or VLR of the MSC to query the MSISDN of the MS according to the IMSI or TMSI of the MS, and sends the query result to the anchor MSC;

Step 4, the anchor MSC sends the MS's MSISDN and its IMSI or TMSI in the query result to all relay MSCs;

In step 5, the relay MSC sends the found MSISDN to all BSSs.

It can be seen from the above-mentioned embodiments that the method for identifying the talking party in the group call of the present invention enables the network side to obtain the MSISDN of the talking party MS, and the network side can directly send the MSISDN of the talking party MS to the The MS of other listening users, the MS of other listening users use the calling party number identification and display function of the existing MS to notify the user of the MSISDN, and it is easy to implement without any modification to the system hardware.

Claims (9)

1. A method for identifying a speaking party in a group call, characterized in that the method comprises the following steps: 1) In the group call uplink channel preemption process, the mobile station MS sends a message including identity information to the BSS after receiving the uplink occupation request response returned by the base station subsystem BSS; 2) After the BSS receives the message containing the identity information, it forwards the message to the mobile switching center MSC; 3) The MSC analyzes the identity information of the speaker MS in the message sent in step 2), and searches for the user's mobile station ISDN number MSISDN according to the identity information. After selecting a suitable speaker, the MSC will find the MSISDN issued to all BSS; 4) The BSS sends the received MSISDN to the MS in the group to which the MS belongs. 2. The method according to claim 1, wherein the message including the identity information in step 1) is an SABM message for setting an asynchronous balance mode. 3. The method according to claim 1 or 2, wherein the identity information is an International Mobile Identity (IMSI) or a Temporary Mobile Identity (TMSI). 4. The method according to claim 3, wherein said step 3) comprises: 31) After the anchor MSC or the relay MSC receives the uplink channel request from the MS in the local MSC, if the MS is allowed to access, it will query in the home location register HLR or the visitor location register VLR of the local MSC according to the IMSI or TMSI of the MS. The MS's MSISDN, HLR or VLR sends the query result to the anchor MSC; 32) After the anchor MSC selects a suitable speaker, it sends the MSISDN and IMSI or TMSI of the speaker MS to all relay MSCs; 33) The relay MSC sends the found MSISDN to all BSSs. 5. The method according to claim 3, wherein said step 3) comprises: 3a) After the relay MSC receives the uplink channel request from the MS in the local MSC, if the MS is allowed to access, it sends the IMSI or TMSI of the MS to the anchor MSC; when the anchor MSC receives the uplink channel request from the MS in the local MSC After that, if the MS is allowed to access, then directly perform step 3b); 3b) After the anchor MSC selects a suitable speaker, it determines the MSC where the speaker MS is located, and requests the MSC to query the MS's MSISDN; 3c) The MSC that receives the request to inquire about the MSISDN, goes to the HLR or VLR of the MSC to inquire about the MSISDN of the MS according to the IMSI or TMSI of the MS, and sends the inquiring result to the anchor MSC; 3d) The anchor MSC sends the MS's MSISDN and its IMSI or TMSI in the query result to all relay MSCs; 3e) The relay MSC sends the found MSISDN to all BSSs. 6. The method according to claim 1, characterized in that: in step 3), the MSC sends the MSISDN of the MS it recognizes to all BSSs through an uplink captured UPLINK SEIZED message. 7. The method according to claim 1, characterized in that in step 4), the BSS sends the received MSISDN to the MS in the group where the MS belongs to: the BSS uses the downlink voice group call service VGCS channel of the group The call channel FACCH sends a talker identifier TALKER MSISDN message including the MSISDN of the talking party to all MSs in the group. 8. The method according to claim 7, characterized in that: the BSS repeatedly sends the TALKER MSISDN message including the MSISDN of the speaking party for many times. 9. The method according to claim 1, further comprising: the MS notifies the user of the MSISDN by using the caller number identification and display function of the existing MS.

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