CN1941951A - Method and system for group call telecommunication - Google Patents

Abstract

The invention discloses a trunking group call communication method and system. The method sets a first priority level for a user's first service, and the first priority level is lower than the voice service priority; the network according to the The first priority information is to allocate channel resources for the user's first service. The system includes a Home Location Register (HLR), a Group Call Register (GCR), and a Mobile Switching Center (MSC). The MSC is provided with a Base Station Subsystem (BSS), and the HLR is provided with a first priority information storage unit , the MSC is provided with a first priority query unit, when the MSC receives the user's first service request, it requests the user's first priority information from the HLR through the first priority query unit, and Allocating channel resources to the user according to the first priority information. The present invention does not affect the existing voice service of the cluster when the user is using the low-priority service.

Description

A trunk group call communication method and system

technical field

The present invention relates to the communication field, in particular to a trunking group call communication method and system, which realizes the parallel processing function of the trunking system for low-priority services by setting a priority lower than ordinary ones.

Background technique

Trunking wireless communication system, hereinafter referred to as trunking system, is a relatively economical and flexible command and dispatch communication system developed in recent years, widely used in government agencies, energy transportation, airport terminals, industrial and mining enterprises, fire police, water conservancy and Military and other units to meet the needs of internal communication of each unit.

In the current trunking communication system, each group includes a group identification ID and a group call area, wherein the group call area is defined as a group of cells. However, these information are all fixed information stored in the Home Location Register (HLR) and the SIM card when the account is opened, and the mobility management of the group call users has not been realized.

Fig. 1 is the core network structure of the trunking system in the prior art, wherein:

User information is stored in the HLR, including the user's International Mobile Subscriber Identity (IMSI) and the group ID list to which it belongs (a user can belong to 50 groups at most).

The gateway mobility switch (GMSC) is connected to the external network, and the GMSC is also connected to the anchor mobility switch (Anchor MSC).

The anchor MSC is responsible for managing and maintaining a specific Voice Group Call Service (VGCS).

When the relay MSC spans multiple MSCs in the group call area, all MSCs except the anchor MSC. There is a one-to-many tree relationship between the anchor MSC and the relay MSC.

The visitor location register (VLR) stores the user IMSI and the ID list of the group to which the user belongs. When the user roams, the information is copied from the HLR.

The group call register (GCR) contains the group ID and the group call area, and the combination of the group call area and the group ID is called the group call reference. The GCR connected to the anchor MSC includes a list of dispatchers related to the group call reference, a list of relay MSCs, and a list of cells directly controlled by the anchor MSC. The GCR connected to the relay MSC 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 a group call initiation request, the anchor MSC queries the connected GCR for the group attribute. Obtain dispatcher list, relay MSC list, and cell list under the control of this MSC. Then call the dispatcher, call the relay MSC and establish a group call channel for the cells under the control of the MSC, notify the users in the group through the NCH of each cell that there is a group call initiation, and specify the group call channel parameters for the users in the group to monitor.

After the relay MSC receives the group call request from the anchor MSC, it queries the connected GCR for the list of cells, establishes group call channels in these cells, and notifies the users in the group that a group call is initiated through the notification channel (NCH), and specifies its Group call channel parameters for users in the group to monitor.

When a group call is initiated, a group of users in a specific area can simultaneously join the group call and monitor the speaker. There can only be one speaker at a time, and when the speaker finishes speaking, other users can become speakers by pressing the PTT button (Push to talk). During the call, any user can decide to leave or join the group call midway, and users who enter the group call area can receive the notification and join the group call midway.

The talker can occupy the uplink group call channel and monitor the downlink group call channel at the same time; the network can also allocate an independent uplink and downlink dedicated channel for the talker. But the listener can only monitor the downlink group call channel.

In the technical solution of prior art 1, each user has one or several speaking priorities, and the current trunking system supports three levels of user priorities, namely Normal, Privileged and Emergency. The priority specifies the priority order of different users when speaking. When a user with a lower priority occupies the uplink channel to speak, the user with a higher priority can interrupt his call and become the speaker himself; at the same time, if several users with different If users with priority levels send uplink call requests at the same time, the network accepts the request from the user with the highest priority level. All users have common priority, and some users have priority and emergency priority. The acquisition of priority and emergency call rights is independent of each other, and the acquisition of priority requires the confirmation and allocation of the network.

The call with normal priority has the lowest priority and can be interrupted or preempted by calls with priority and emergency priority. The priority of priority is lower than that of emergency calls and can be interrupted by emergency calls. But in general, users are not allowed to use emergency priority, and emergency calls are only used in very urgent situations. At the same time, the network will send emergency instructions on the paging channel and dedicated channel in the relevant area.

When different users initiate call requests, the network authorizes the user with the highest priority to speak according to the priority levels carried in each request. For users with the same priority level, the network determines who gets the right to speak uplink through certain arbitration methods. But users can only transmit voice information after obtaining uplink, and when other users are talking, other users can only send uplink request messages.

When the uplink is busy, the terminal is only allowed to send requests with a priority higher than that of the current speaker; at the same time, the network only authorizes request users with a higher priority than the current speaker. The current standard supports two methods of sending uplink preemption requests: 1. Under channel 1.5, all user preemption requests are sent through the group call uplink channel; 2. Under channel 1.0, all preemption requests are sent through the Random Access Channel (RACH) channel. Which of the two methods is supported, the network will broadcast on the NCH.

When the uplink channel is idle, all uplink call requests are sent through the group call uplink channel.

The uplink and downlink group call channels and dedicated channels in the existing system can only be used to send voice messages and a small amount of data service messages, but cannot be used to send data service messages alone. If the low-priority service is sent on the group call channel, it will affect the normal use of the ordinary voice service, so that the user cannot handle such as general packet radio service (GPRS), short message service (SMS) and positioning service ( LCS) and other low-priority services.

Contents of the invention

The invention provides a trunking group call communication method, which is used to solve the problem in the prior art that the low-priority service sent by the group call channel affects the normal use of the ordinary voice service.

The inventive method comprises:

A trunking group call communication method, characterized in that a first priority is set for the user's first service, and the first priority level is lower than the voice service priority; when the user initiates the first service request , allocating channel resources to the first service of the user according to the first priority information.

The first service request is initiated when the group call uplink channel is idle.

In the method, the network allocates channel resources for the first service of the user according to the first priority, which specifically includes the following steps:

A. The network authenticates the identity information of the user;

B. The network allocates channel resources to the user according to the first service request of the user.

The described method also includes the steps of:

C. The user performs the first service on an assigned channel.

Before said step A, also include steps:

A1. The network sends an authorization message to the user on the group call downlink channel;

A2. The user sends a response message on the group call uplink channel, and the response message carries the identity information of the user and the requested service category information.

In the step B, the channels allocated to the users are dedicated uplink and downlink channels.

In the step B, the channel allocated to the user is a group call uplink channel and a group call downlink channel.

In the method, when the first service is in progress, if the network receives a second service request whose priority is the second priority, then compare the first priority with the second priority:

When the first priority is higher than or equal to the second priority, rejecting the second service request;

When the first priority is lower than the second priority, the first service is interrupted, and channel resources are allocated for the second service.

In the method, if the first service is a circuit domain service, the interruption of the first service is terminating the first service;

If the first service is a packet domain service, the interruption of the first service is to suspend the transmission of the first service data.

In the method, when the first service is a packet domain service, the first service is continued after the group call uplink channel is idle or the second service ends.

In the step B, the network further includes broadcasting an uplink busy indication message to other users, and the uplink busy indication message carries the first priority level of the first service.

The method further includes broadcasting the first service establishment message in the cell where the user is located or in the control area of the base station controller.

The inventive system includes:

A trunking group call communication system, comprising a home location register for storing user information, a group call register for storing group call information, and a mobile switching center for managing user services, the mobile switching center is provided with a base station subsystem, which It is characterized in that a first priority information storage unit is set in the home location register for storing the first priority information of the user's first service, and a first priority query unit is set in the mobile switching center, When the mobile switching center receives the user's first service request, it requests the user's first priority information from the home location register through the first priority query unit, and provides the user with the first priority information according to the first priority information. The user is allocated channel resources.

The mobile switching center is provided with a priority comparison unit for comparing the priorities of the received services.

The beneficial effects of the present invention are as follows:

The present invention realizes the parallel processing function of the low-priority business of the cluster system through a priority lower than ordinary ones. In this way, when a user is using a low-priority service, the existing voice service of the cluster will not be affected.

Description of drawings

FIG. 1 is a schematic diagram of a cluster system in the prior art;

Fig. 2 is a schematic flow sheet of the present invention;

FIG. 3 is a schematic diagram of simultaneous existence of low-priority services in different cells in an embodiment of the present invention;

FIG. 4 is a schematic diagram of the network structure of the present invention.

Detailed ways

The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

The low-priority services mentioned in this document can refer to other types of services that are different from voice services.

The present invention sets a lower priority for the service of user A——A, the priority level of A is lower than the normal priority, that is, the service of A can be interrupted by any voice service request, and at the same time, according to the particularity of the service of A , it can be set that this service A can only be applied when the current group call uplink channel is idle. When the group call uplink channel is idle, the user terminal sends an uplink call request through the group call uplink channel, and the call request carries priority level A.

As shown in Figure 2, it is a schematic flow sheet of the present invention, as seen from the figure, mainly comprises the following steps:

S1. The BSS broadcasts an uplink channel idle indication message to the user terminal;

S2. The user terminal initiates an uplink call request with priority A, and the uplink call request carries priority A;

S3. The BSS sends a request authorization message to the user terminal;

After the network receives the call request, if the current group call uplink is idle and there is no higher priority call request, the network sends a grant (GRANT) message on the group call downlink channel.

S4. The user terminal reports user information and request service category to the BSS;

After receiving the authorization message from the network, the user terminal sends a response message on the group call uplink channel. The response message carries user identity information and the requested service category, where the requested category is A service with A priority set.

S5. The BSS sends an uplink call request to the MSC;

The uplink call request carries relevant information such as user information, request priority level, and request service category, so that the network can make corresponding judgments.

S6, performing a standard authentication process between the MSC and the VLR;

A standard authentication process is performed between the MSC and the VLR to authenticate the user information and the information on opening the A service.

S7. The MSC sends an uplink request confirmation message to the BSS;

After passing the authentication, the MSC sends an uplink request confirmation message to the BSS.

S8. The BSS broadcasts an uplink busy indication;

The BSS broadcasts an uplink busy indication message to the user terminal. The uplink busy indication message carries the priority A of user A's service, so that when other user terminals want to initiate a service request, judgment can be made according to the priority information.

S9. The MSC establishes a service bearer channel for the user.

After authenticating the legal identity of the user, the network allocates corresponding channel resources to the user according to the service category requested by the user.

In the scheme of the present invention, if the uplink channel preemption supported by the network is 1.5 channel mode, then the network allocates a dedicated uplink and downlink channel for the user, and the user sends and receives low-priority service data on the dedicated channel allocated; if the uplink channel preemption supported by the network In the 1.0 channel mode, the user occupies the group call uplink channel to send low-priority service requests, and at the same time uses the group call downlink channel to receive service downlink data. As an option, a dedicated connection such as 1.5 channel can also be established at this time.

In the scheme of the present invention, when a user uses a low-priority service (such as a set A service), the user terminal only interacts with the local MSC, without distinguishing between the anchor MSC and the relay MSC, and the anchor MSC may not know other relay MSCs The user under is using service A with priority A. At the same time, when the low-priority service requested by the user does not involve other users in the group (for example, it has nothing to do with other users in the group or is only related to some users), the network does not need to downlink broadcast the group call uplink busy message in the entire group call area and carry the user priority At this time, the network only broadcasts the group call uplink busy message in the cell where the user is located or the BSC control area, carrying the user priority as A, while the group call uplink channel idle message is still repeated in other cells.

If the network only broadcasts the group call uplink channel busy message in the cell where the user is located and carries the user priority as A, then the A interface between the BSC and MSC cannot be shared; otherwise, if the network wants to share the A interface resources between the BSC and MSC, Then the network can only broadcast the group call uplink occupied message and the priority information A of the user's A service in the BSC area where the user is located.

For the 1.5 channel, the user's low-priority service is carried out on the dedicated channel, and at this time, the process of sending a voice service request by other users is the same as that of the prior art. If the uplink channel is free, it will be sent directly; if the uplink channel is occupied, the priority of the new call request must be higher than the priority of the current user service. Therefore, if the uplink busy message carries user priority A, other users must not send an uplink call request with priority A. Similarly, when the BSC receives a call establishment request with a priority higher than A, it should temporarily suspend the service with priority A of the subordinate users.

The interruption here has different meanings for different services. For the circuit domain service, it means the end of this service. For the packet domain service, it only temporarily suspends the data transmission. The service can be continued when the group call is idle or after the group call ends. . However, in any case, when the uplink of the group call is idle, the user can continue to initiate a call request with priority A.

For channel 1.0, the user uses the group call channel to perform low-priority services. If the user reads the group call uplink busy message, it sends an uplink call request on RACH, but the premise is that the priority of the new call request is higher than that of the current uplink user. Priority: If the user reads the group call uplink idle message, the uplink call request will be sent directly on the group call uplink channel. At this time, the BSC of the cell where the low priority service is located will have a higher priority than A when receiving a new call establishment request. At this time, the same as the above channel 1.5, the service with priority A of the user in the BSC area is interrupted.

In the scheme of the present invention, the precondition for the user to use the low priority service is that the group call uplink channel is idle, and the user uses the group call uplink to send the low priority service request. But the service establishment message with priority A is not broadcast in the whole group call area. Therefore, in a group call, users in different cells (or base station areas) can simultaneously initiate low-priority service request messages without interfering with each other; At this time, the network can only support one low-priority service request. As shown in Figure 3, low-priority services in different cells can exist at the same time, and the group call uplink channel is occupied in these cells, but the group call uplink channel is idle in the part of the group call area other than these cells, as shown in Figure 3 .

At the same time, the A service with priority A only needs to be processed by the local MSC. If this kind of non-voice service is not related to all other users in the group, there is no need to distinguish between the anchor MSC and the relay MSC, and the anchor MSC does not need to know about other MSCs. Service A with priority A.

The process of interactive negotiation between the MSC and the UE to establish a low-priority service is handled according to the current standard procedure for processing low-priority services in the network.

As shown in Figure 4, it is a schematic diagram of a network structure of the present invention, as can be seen from the figure, it mainly includes:

A home location register (HLR) storing subscriber information;

A group call register (GCR) for storing group call information;

And the MSC that manages user services; there is a BSS under the anchor MSC, and the BSS is composed of one BSC and several Cells, one MSC has several BSSs, and each MSC (including A-MSC and R-MSC) has one or several A BSS, generally an MSC has an associated GCR and VLR.

In the present invention, a first priority information storage unit is set in the HLR, which is used to store the first priority information of the user's first service, and when the anchor MSC receives the user's first service request, it sends the The HLR requests the user's first priority information, and allocates channel resources for the user according to the first priority information.

In the present invention, the MSC is also provided with a priority comparison unit for comparing the priority of received services.

When the user's first service is in progress, if a second service request with the second priority is received, the first priority and the second priority are compared by the priority comparison unit:

When the first priority is higher than or equal to the second priority, rejecting the second service request;

When the first priority is lower than the second priority, the first service is interrupted, and channel resources are allocated for the second service.

The present invention realizes the parallel processing function of the low-priority business of the cluster system through a priority lower than normal (Normal). In this way, when a user is using a low-priority service, the existing voice service of the cluster will not be affected.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (14)

1. A trunking group call communication method, characterized in that a first priority is set for the user's first service, and the first priority level is lower than the voice service priority; when the user initiates the first service When requesting, allocate channel resources for the user's first service according to the first priority information. 2. The method according to claim 1, wherein the first service request is initiated when the group call uplink channel is idle. 3. The method according to claim 1, wherein the network allocates channel resources for the first service of the user according to the first priority, which specifically includes the following steps: A. The network authenticates the identity information of the user; B. The network allocates channel resources to the user according to the first service request of the user. 4. The method of claim 3, further comprising the steps of: C. The user performs the first service on an assigned channel. 5. The method according to claim 3 or 4, characterized in that before said step A, it also includes the steps of: A1. The network sends an authorization message to the user on the group call downlink channel; A2. The user sends a response message on the group call uplink channel, and the response message carries the identity information of the user and the requested service category information. 6. The method according to claim 3, characterized in that, in the step B, the channels allocated to the users are dedicated uplink and downlink channels. 7. The method according to claim 3, characterized in that, in the step B, the channel allocated to the user is a group call uplink channel and a group call downlink channel. 8. The method according to claim 6 or 7, wherein when the first service is in progress, if the network receives a second service request with the second priority, then compare the first priority and second priority: When the first priority is higher than or equal to the second priority, rejecting the second service request; When the first priority is lower than the second priority, the first service is interrupted, and channel resources are allocated for the second service. 9. The method of claim 8, wherein: If the first service is a circuit domain service, then the interruption of the first service is terminating the first service; If the first service is a packet domain service, the interruption of the first service is to suspend the transmission of the first service data. 10. The method according to claim 9, wherein when the first service is a packet domain service, the first service is continued after the group call uplink channel is idle or the second service ends. 11. The method according to claim 3, wherein in the step B, the network further includes broadcasting an uplink busy indication message to other users, and the uplink busy indication message carries the first service information of the first service. priority level. 12. The method according to claim 1, further comprising broadcasting the first service establishment message in the cell where the user is located or in the control area of the base station controller. 13. A trunking group call communication system, including a home location register for storing user information, a group call register for storing group call information, and a mobile switching center for managing user services. The mobile switching center is provided with a base station subsystem , it is characterized in that a first priority information storage unit is set in the home location register for storing the first priority information of the user's first service, and the first priority query is set in the mobile switching center unit, when the mobile switching center receives the user's first service request, it requests the user's first priority information from the home location register through the first priority query unit, and according to the first priority information Allocate channel resources to the user. 14. The system according to claim 13, wherein said mobile switching center is provided with a priority comparison unit for comparing the priorities of the received services.

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