CN100341354C - Method for identifying speaker in group calling - Google Patents

Abstract

The present invention discloses a method for identifying speakers in group calling, which comprises that 1), in the occupying process of an uplink channel in group calling, after a mobile station MS receives an uplink occupying request response returned by base station subsystems BSS, the sends a message which comprises an ISDN number of MSISDN of the mobile station to the BSS; 2), after the message which comprises the MSISDN is received, the message is forwarded to a mobile switching center MSC; 3), the MSC analyzes the MSISDN in the message of the step 2); after a proper speaker is selected, the MSC sends down the approved MSISDN by the MS to all BSS; 4), the received MSISDN is sent to the MS of a group. The method of the present invention is applied; 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

A method for identifying speaking parties 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 (including uplink and downlink), and the uplink is only used by the current speaker, that is, the current speaker It is the group transmission mode; all listeners are waiting on the downlink, that is, all the listeners are the group reception mode; the notification message configured on 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 mobile switch (GMSC) 103 is connected to the external network 101, and the GMSC is also connected to an anchor mobile switch (Anchor MSC) 105.

Anchor MSC 105 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:

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

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 (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. 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 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 set asynchronous balance mode SABM (L3 MSG) message to the BSS, This message is a layer two link setup and layer three message.

Step 7: After the anchor MSC selects a suitable speaker, it sends UPLINK_REQ_ACK to the BSS. If the uplink is seized successfully, the anchor MSC will also send an uplink seized (UPLINK_SEIZED) message to other BSSs to notify that the uplink is busy.

In step 8, the BSS sends a UA (L3MSG) 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 executing 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, after receiving the uplink occupation request response returned by the base station subsystem BSS, the mobile station MS sends a message including the mobile station integrated service digital network number MSISDN to the BSS;

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

3) The anchor MSC resolves the MSISDN in the message in step 2), and after selecting a suitable speaker, the anchor MSC sends the MSISDN of the MS it recognizes to all BSSs;

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

Wherein, the message including the MSISDN described in step 1) may be an SABM message for setting an asynchronous balance mode.

The MSISDN can be added in the SABM message.

MSISDN may also be used to replace the original International Mobile Identity IMSI or Temporary Mobile Identity TMSI in the SABM message;

In the group call uplink channel preemption process, the BSS includes the MSISDN in the returned uplink occupation request response;

The MS compares the MSISDN in the uplink occupation request response with its own MSISDN, and if they are the same, it confirms that it succeeds in preempting the uplink channel; otherwise, it fails in preempting the uplink channel.

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

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

It can be seen from the above technical solution that the method for identifying the speaking party in the group call of the present invention uses the method that the MS includes the MSISDN in the SAMB message sent to the BSS, so that the network side can obtain the MSISDN of the talking party MS, and the network side The MSISDN of the speaker MS is directly sent to the MSs of other listening users through an 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 flowchart of group call uplink channel preemption in a preferred embodiment of the present invention.

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.

In the present invention, the MS includes the MSISDN in the SABM message sent to the BSS, so that the network side can obtain the MSISDN of the speaker MS, and the network side can directly send the MSISDN of the speaker MS to other listening MSs through an air interface message , other MSs listening to the user 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:

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

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 (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. Included in this message is the MSISDN 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. MSC parses out the MSISDN of the speaking party in the message. After selecting a suitable speaker, the uplink occupation is successful. The anchor MSC will send the MSISDN of the user it recognizes to other BSSs through 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 INDICATION message including the MSISDN of the mobile station to all MSs in the group.

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, other MSs in the BSS send an UPLINK_BUSY message 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, the MS adds the MSISDN to the SABM message sent to the BSS, and the MSISDN can also be used to replace the original IMSI or TMSI, so that the MS can confirm whether it has seized the uplink channel by comparing the MSISDN. Specifically, the BSS includes the MSISDN in the returned uplink occupation request response, and the MS compares the MSISDN in the uplink occupation request response with its own MSISDN, and if they are the same, it confirms that it has preempted the uplink channel, otherwise it has not preempted the uplink channel.

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 (6)

1, the recognition methods of speaker in a kind of group call is characterized in that this method may further comprise the steps:

1) in group call uplink lchannel preempting flow process, mobile station MS receives that base station sub-system BSS returns up take the request response after, send the message that comprises travelling carriage integrated services digital network MSISDN to BSS;

2) after BSS receives the message that comprises MSISDN, give the anchor moving exchanging center MSC with this forwards;

3) anchor MSC parses step 2) MSISDN in the described message, after selecting suitable speaker, anchor MSC is handed down to all BSS with the MSISDN of the MS of its approval;

4) BSS sends to the MSISDN that receives the MS of this MS place group.

2, the method for claim 1 is characterized in that: the message of the described MSISDN of comprising of step 1) is for being provided with Asynchronous Balanced Mode SABM message.

3, method as claimed in claim 2 is characterized in that: increase MSISDN in described SABM message.

4, method as claimed in claim 2 is characterized in that: replace mobile identify label IMSI in original world or interim mobile identify label TMSI in the described SABM message with MSISDN;

In group call uplink lchannel preempting flow process, BSS comprises MSISDN up the taking of returning in the request response;

MS compares the up MSISDN that takies in the request response with the MSISDN of self, if identical then confirm oneself to seize the up channel success, fail otherwise seize up channel.

5, the method for claim 1 is characterized in that: the described anchor MSC of step 3) is handed down to all BSS with the MSISDN of the MS of its approval and issues by the up UPLINK_SEIZED message that has been hunted down.

6, the method for claim 1 is characterized in that, this method further comprises: MS discerns and Presentation Function with the caller number of existing MS, MSISDN is notified to the user of described MS correspondence.

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