WO2017132972A1

WO2017132972A1 - Group call downlink data packet transmission method, system and device

Info

Publication number: WO2017132972A1
Application number: PCT/CN2016/073589
Authority: WO
Inventors: 陈钢; 尧俊峰
Original assignee: 海能达通信股份有限公司
Priority date: 2016-02-05
Filing date: 2016-02-05
Publication date: 2017-08-10

Abstract

A group call downlink data packet transmission method, for use in effectively enhancing bearer network transmission efficiency and core network performance under the scenario of group call downlink transmission, thereby enhancing the capacity and performance of cluster services. In some feasible implementation manners of the present invention, the method comprises: a core network device establishes a multicast distribution tree for a group initiating a group call when the core network device receives a group call request, the multicast distribution tree using the core network device as a multicast source and using at least one base station to which multiple terminals in the group belong as a leaf node; the core network device distributes group call downlink data packets to the at least one base station by means of the multicast distribution tree, so that the group call downlink data packets are forwarded to multiple terminals by the at least one base station; and the core network device deletes the multicast distribution tree when the group call ends.

Description

Group call downlink data packet transmission method, system and device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a group call downlink data packet transmission method.

Background technique

At present, cluster users are increasingly interested in high-speed data services. The high-speed data service represented by video services is one of the fastest-growing cluster services. The high-speed data service brings more and more pressure to the bearer network between the cluster core network and the base station.

Usually, the bearer network between the cluster core network and the base station uses a traditional unicast (point-to-point) transmission method, and the core network needs to separately send one data to each base station participating in the group call. Please refer to FIG. 1 , which is a schematic diagram of a cluster system transmitting data by using a unicast transmission mode. The group call of the cluster includes three terminals: the terminal A of the base station 1 , the terminal B of the base station 2, and the terminal C of the base station 3, and the data source (source) Transmitting a data stream of downlink data to the group call user (ie, terminals A, B, and C), wherein the core network gateway (Gateway, GW) transmits the data from the data source to the base station participating in the group call by using a point-to-point transmission method. . The specific process includes: the data source source sends a unicast data to the core network gateway; the core network gateway separately copies and sends a data for each base station participating in the group call, and a total of three base stations participate in the group call, that is, the original one The data needs to be copied into three transmissions; each data packet arrives at each base station independently through an IP (Internet Protocol) bearer network; the base station transmits data to the terminal through the group call downlink shared channel.

In practice, it is found that the bearer network between the cluster core network and the base station uses the traditional unicast point-to-point transmission mode. Since each base station participating in the group call needs to separately copy one data and transmit it to the base station through the bearer network, it has the following defects: 1. There is a large amount of redundant traffic in the bearer network, which seriously reduces the transmission efficiency of the bearer network. 2. The core network gateway needs to copy and distribute multiple copies of data, and increases the CPU (Central Processing Unit) load to reduce performance. These deficiencies severely reduce the capacity and performance of cluster services.

Summary of the invention

The embodiment of the invention provides a group call downlink data packet transmission method, so as to improve the transmission efficiency of the bearer network and the performance of the core network in the scenario of downlink transmission of the group call, and improve the capacity and performance of the cluster service.

A first aspect of the present invention provides a group call downlink data packet transmission method, including: a core network device When the group call request is received, a multicast distribution tree is established for the group that initiates the group call, where the multicast distribution tree uses the core network device as a multicast source, and at least a plurality of terminals in the group belong to One base station is a leaf node; the core network device distributes the group call downlink data packet to the at least one base station via the multicast distribution tree, so that the group call downlink data packet is forwarded by the at least one base station to the a plurality of terminals; the core network device deletes the multicast distribution tree when the group call ends.

A second aspect of the present invention provides a group call downlink data packet transmission system, including: a control module, configured to enable a core network device to establish a multicast distribution tree for a group that initiates a group call when receiving a group call request, The multicast distribution tree uses the core network device as a multicast source, and at least one base station to which the plurality of terminals in the group belong is a leaf node; and the transmission module is configured to enable the core network device to downlink data of the group call Distributing the packet to the at least one base station via the multicast distribution tree, so that the group call downlink data packet is forwarded by the at least one base station to the multiple terminals; and the control module is further configured to: The network device deletes the multicast distribution tree when the group call ends.

A third aspect of the present invention provides a core network device, including: a processor, a memory, a bus, and a communication interface; the memory is configured to store a program, and the processor is connected to the memory through the bus, when the core When the network device is running, the processor executes the program stored by the memory to cause the core network device to perform the group call downlink data packet transmission method according to the first aspect of the present invention.

A fourth aspect of the present invention provides a group call service processing system, including the foregoing core network device, and a bearer network and a base station.

A fifth aspect of the invention provides a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, when executed by a core network device comprising one or more processors, And causing the core network device to perform the group call downlink data packet transmission method according to the first aspect of the present invention.

It can be seen that, in some feasible implementation manners of the present invention, by dynamically establishing a multicast distribution tree when receiving a group call request, the group call downlink data packet is distributed to the base station through the multicast distribution tree, thereby realizing The multicast (point-to-multipoint) transmission method is adopted between the core network and the base station, and the following technical effects are obtained:

1. By adopting the multicast transmission mode, the core network only transmits one data to all the base stations participating in the group call, so that the data can be transmitted simultaneously for multiple base stations, compared with the traditional point-to-point unicast transmission mode. In the scenario of group call downlink transmission, it can reduce redundant traffic and greatly save resources. Effectively improve the transmission efficiency of the bearer network and the performance of the core network, thereby improving the capacity and performance of the cluster service;

2. Dynamically establish a multicast distribution tree when receiving a group call request, and immediately delete the multicast distribution tree when the group call ends, which can improve the number of group calls used by the bearer network and reduce the number of group calls. Bandwidth consumption.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments and the prior art description will be briefly described below. Obviously, the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those skilled in the art without any inventive effort.

1 is a schematic diagram of a cluster system transmitting data by using a unicast transmission method;

2 is a schematic diagram of a schematic diagram of a cluster system and a multicast transmission mode;

3 is a schematic flowchart of a group call downlink data packet transmission method according to an embodiment of the present invention;

4 is a schematic diagram of a group call packet protocol stack in a broadband cluster system;

5 is a schematic diagram of a process of establishing and using a multicast distribution tree in a broadband cluster system;

6 is a schematic structural diagram of a group call downlink data packet transmission system according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a core network device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is an embodiment of the invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

The terms "first", "second", "third" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects, and are not intended to describe a specific order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products or equipment.

The technical solution of the embodiment of the present invention is applied to a cluster system. The architecture of the cluster system is as shown in FIG. 2, and includes a core network, a bearer network, a base station, and a terminal, where the core network is connected to multiple base stations through a bearer network, and the bearer network is Specifically, it may be an IP bearer network. The cluster system may be a broadband cluster system, such as an LTE (Long Term Evolution) broadband cluster system, or a narrowband cluster system such as a PDT (Professional Digtal Trunking) cluster system.

In different cluster systems, the core network can have different core network devices. For example, in an LTE broadband cluster system, the core network may include an eMME (enhanced Mobility Management Entity), a TCF (Trunking Control Function), and an eHSS (enhanced Home Subscriber Server). Servers, xGW (X Gateway, Cluster Gateway), TMF (Trunking Media Function, Cluster Media Function Module), five types of network elements, where xGW is the core network gateway (Gateway, GW). In the PDT cluster system, the core network device may be a switch, and the switch implements the functions of the above five network elements.

In view of the problems raised in the background art, this aspect proposes a transmission technology scheme for transmitting a downlink packet of a group call using a multicast technology on a bearer network between a core network and a base station, and the core idea is: a cluster system and a data communication field. The multicast technology is combined, and considering the capacity limitation of the routers at all levels of the bearer network in the actual network deployment, the multicast distribution tree is established in a dynamic establishment manner, that is, when the terminal initiates a group call, the cluster core network and the base station The multicast distribution tree is dynamically established on the bearer network for the group to which the terminal belongs. Then, the dynamically generated multicast distribution tree can be used to distribute the group call downlink data packet, and the group call downlink data packet is transmitted to each participant through the multicast distribution tree. The base station is configured to reduce the redundant traffic in the bearer network, improve the transmission efficiency, and prevent the core network device from replicating and distributing multiple data, reducing the CPU load of the core network device, improving the performance of the core network device, thereby improving the capacity of the cluster service and performance. Moreover, when the group call ends, the multicast distribution tree is deleted immediately to avoid consuming the bandwidth of the bearer network. The method can improve the number of group calls that use multicast in the bearer network, reduce the delay caused by the replication and distribution of the downlink packets of the group call, and reduce the consumption of the bandwidth of the bearer network.

The IP bearer network multicast technology used in the embodiment of the present invention includes the group member management protocol IGMPv3 (Internet Group Management Protocol v3, the third version of the Internet Group Management Protocol) and the multicast routing protocol PIM-SSM (Protocol-Independent Multicast–Source Specific) Multicast, protocol independent - specific source multicast). IGMPv3 is used by the base station to join and exit the bearer network. Multicast. The PIM-SSM is configured to establish, on the bearer network router, a multicast distribution tree in which the core network device, such as the core network gateway GW, is the source and the participating base station is the leaf node.

Please refer to FIG. 3, which is a schematic flowchart of a group call downlink data packet transmission method according to an embodiment of the present invention. The method may include:

The core network device, when receiving the group call request, establishes a multicast distribution tree for the group that initiates the group call, where the multicast distribution tree uses the core network device as a multicast source, and the multiple terminals belong to At least one base station is a leaf node.

The first implementation of the method in the embodiment of the present invention is to establish a multicast distribution tree on the bearer network. In some embodiments, when a terminal in the group initiates a group call request to the core network, the core network device establishes a multicast distribution tree for the group. The group includes a plurality of terminals in the cluster system, and the information of the group may be pre-configured and recorded in the core network device.

In the LTE broadband cluster system, the cluster system may allocate a bearer network multicast address for the group that initiates the group call during the process of establishing the group call service signaling. Specifically, the terminal initiates a group call request to the TCF of the core network, and after receiving the group call request, the TCF sends a request to the eMME to invite the group to which the terminal belongs to join the group call, and the eMME notifies the core network gateway to allocate a multicast address to the group. The eMME transmits the multicast address to the base station participating in the group call, and triggers the base station to join the multicast to the upper-layer router (the router in the bearer network) by using the group member management protocol IGMPv3, and bear the network router for each group to which the terminal belongs. According to the multicast routing protocol PIM-SSM, a multicast distribution tree with the core network gateway as the multicast source (or source) and the participating base station as the leaf node can be established.

In the PDT cluster system, the core network device may be a switch, and the functions of the TCF, the eMME, and the core network gateway are implemented by the switch, and the established multicast distribution tree uses the switch as a multicast source.

In general, the process of establishing a multicast distribution tree may include: the core network device assigning a multicast address to the group in the bearer network, and transmitting the multicast address to the at least one base station, triggering the The at least one base station joins the multicast according to the multicast address, and establishes a multicast distribution tree in which the core network device is a multicast source and the at least one base station is a leaf node. The specific triggering process may include: triggering, by the at least one base station, to apply for joining multicast to each of the upper-level routers in the bearer network according to the multicast address, so that routers at all levels in the bearer network are established. Said The core network device is a multicast source, and the at least one base station is a multicast distribution tree of a leaf node.

320. The core network device distributes the group call downlink data packet to the at least one base station by using the multicast distribution tree, so that the group call downlink data packet is forwarded by the at least one base station to the multiple terminals.

The second implementation process of the method in the embodiment of the present invention is to use the multicast distribution tree established on the bearer network to transmit the group call downlink data packet of the group.

Please refer to the arrow shown in Figure 2 to take the LTE broadband cluster system as an example to show the multicast transmission mode of the cluster system. The specific process includes:

1. The data source (source) sends a unicast data to the core network gateway.

2. The core network gateway does not separately copy and send a piece of data for each base station participating in the group call, but forwards the data to the IP bearer network.

3. The data packet arrives at each base station in the IP bearer network according to the multicast distribution tree.

4. The base station transmits data to the terminal through the group call downlink shared channel.

The core network gateway receives the group call downlink data packet of the data source, sets the destination IP address of the outermost IP header of the data packet to the bearer network multicast IP address, and then uses the multicast packet as the source of the multicast distribution. Send to the bearer network. Different from the point-to-point unicast mode, the core network gateway only sends a group call downlink data packet to the bearer network. The bearer network transmits the group call downlink data packet to the leaf node base station according to the multicast distribution tree generated by the multicast routing protocol PIM-SSM. The base station further transmits the group call downlink data packet to the terminal by using the group call downlink shared channel.

In the PDT cluster system, the core network device may specifically be a switch, and the function of the core network gateway is implemented by the switch.

In summary, the process of transmitting data using a multicast distribution tree includes:

After the group initiates the group call, the core network device receives the group call downlink data packet sent by the data source in a unicast manner; the core network device sends the outermost layer of the group call downlink data packet. The destination address of the IP header is set to the multicast address of the group; the core network device sends the group call downlink data packet that is configured as described above to the bearer network along the multicast distribution tree, so that the group call downlink A data packet is distributed to the at least one base station along the multicast distribution tree in the bearer network.

In the embodiment of the present invention, the multicast transmission mode is adopted to avoid redundant traffic in the IP bearer network, To effectively improve the transmission efficiency of the bearer network and the performance of the core network equipment.

330. The core network device deletes the multicast distribution tree when the group call ends.

The step of deleting the multicast distribution tree is the third implementation process of the method of the embodiment of the present invention.

In the embodiment of the present invention, when the group call service ends, the core network device triggers the base station to exit the multicast. The triggering operation includes: the core network device instructing the at least one base station to completely quit the multicast to complete the deletion of the multicast distribution tree. The base station can use the IGMPv3 protocol to send an IGMP leave message to its upper-level router to request to exit the multicast. The bearer network router updates the multicast distribution tree according to the multicast routing protocol PIM-SSM. When all participating base stations exit the multicast, the multicast distribution tree is completely deleted. The TAIs are complex representations of the TAI (Tracking Area Identity).

It can be seen from the above that in some feasible implementation manners of the present invention, by dynamically establishing a multicast distribution tree, a multicast transmission mode is adopted between the core network and the base station, and the following technical effects are obtained:

1. By adopting the multicast transmission mode, the core network only transmits one data to all the base stations participating in the group call, so that the data can be transmitted simultaneously for multiple base stations, compared with the traditional point-to-point unicast transmission mode. In the scenario of group call downlink transmission, redundant traffic can be reduced, resources are greatly saved, and the transmission efficiency of the bearer network and the performance of the core network are effectively improved, thereby improving the capacity and performance of the cluster service;

2. Dynamically establish a multicast distribution tree when receiving a group call request, and immediately delete the multicast distribution tree when the group call ends, which can increase the number of group calls used by the bearer network and reduce the number of group calls. Bandwidth consumption.

To facilitate a better understanding of the technical solutions provided by the embodiments of the present invention, the following describes an implementation manner in a specific scenario.

In this embodiment, an application scenario in which a cluster system performs a group call service in a broadband cluster system is taken as an example.

Referring to FIG. 4, the group call packet protocol stack in the broadband cluster system is shown. The IP packets on both sides of the core network gateway and the base station use the bearer network multicast address, and the bearer network uses the multicast address to implement the multicast function. Multicast address and GTP-U (GPRS Tunneling Protocol for the user plane, user-level GPRS (General Packet Radio Service) tunneling protocol) header TEID (Tunnel Endpoint ID), the bearer network multicast address assigned to the core network gateway and GTP-U TEID carried by the multicast downlink.

The broadband cluster system includes a terminal, a base station (eNB), a carrier network, and a core network. The core network includes five network elements: eMME, TCF, eHSS, xGW, and TMF, where xGW is a core network gateway, and the bearer is a core network gateway. The network includes routers.

Please refer to FIG. 5 , which is a schematic diagram of a process of establishing and using a multicast distribution tree. The specific process may include:

The user equipment can initiate a group call to a group and send a group call request to the TCF after the LTE Attach process and the SIP (Session Initiation Protocol) Register process. After receiving the group call request, the TCF sends a request (Invite) to the eMME to invite the terminal of the group to join the group call.

2. The eMME sends a Create Group Bearer Request message to the xGW to request the xGW to establish a multicast downlink bearer.

3. The xGW establishes a multicast downlink bearer. In order to use the group call in the bearer network, the group is assigned a multicast add address (Multicast addr), and the GTP-U TEID of the multicast downlink bearer is allocated, and the allocated multicast is allocated. The address and GTP-U TEID are returned to the eMME via the Create Group Response message. The Create Group Response message may also include a core network gateway address (xGW addr).

4. The eMME checks whether the base station (eNB) under the tracking area identifier list (TAI List) of the group call UE has joined the multicast. If the base station has not joined the multicast, the eMME sends an Initial Context Setup Request message to the base station to request it to join the multicast. The message carries the Multicast addr and the GTP-U TEID and the xGW addr.

5. The base station establishes a group context, and sends an IGMP Join message to the upper-layer router located in the bearer network to indicate that the multicast address of the multicast address is to be monitored. The router in the bearer network receives the IGMP Join message and uses the PIM-SSM protocol to establish a multicast distribution tree with the xGW as the source and the base station as the leaf node.

6. The base station returns an Initial Context Setup Response message to the eMME.

7. After the group call is established, the group call data is transmitted. Even if the group of terminals is distributed under a plurality of different base stations, the xGW only needs to issue one group call packet, and does not need to copy and distribute multiple copies. The data packet arrives at each base station according to the multicast distribution tree, and finally is transmitted to the terminal. As can be seen from the figure, the one that arrives at xGW is a single Broadcast data, xGW downlink transmission is multicast data.

8. When the group call ends (TCF receives the group call release request), the core network device eMME notifies the base station to exit the multicast, and the base station sends an IGMP leave message to its upper-level router to exit the multicast. When all base stations exit the multicast, the multicast distribution tree of the bearer network is completely deleted.

In the above, the example method of the present invention has been described by taking a broadband cluster system as an example. It should be noted that, in a narrowband cluster system, such as a PDT cluster system, the process of performing a group call service is similar to the foregoing process. The difference may be that the core network device is a switch, and the switch performs five types of network elements in the broadband system. Features. This article will not be detailed.

It can be seen from the above that in some embodiments of the present invention, the following technical solutions are adopted:

1. The downlink group call data between the base station and the core network is transmitted by using multicast mode;

2. The core network device, for example, the xGW, allocates the multicast address and the TEID of the GTP-U tunnel on the base station side in the group call establishment process, and the base station joins the multicast station in the TAI List by the eMME, and establishes the base station included in the TAI List combination as the area. Bearer network multicast.

3. The multicast distribution tree is dynamically generated during the group call establishment process and is deleted immediately when the group call ends. There are fewer restrictions on the number of router multicast trees in the bearer network.

By adopting the above technical solution, the following technical effects are obtained:

Compared with the traditional unicast transmission, the IP bearer network traffic can be reduced, the system group call capacity can be increased, the core network hardware configuration can be reduced, and the core network construction cost can be saved. The delay caused by the core network replication and distribution of multiple group call data can be reduced. To improve the user experience; significantly increase the system group call capacity without increasing the system base station capacity, and improve the capacity and performance of the cluster service.

In order to better implement the above solution of the embodiments of the present invention, related devices for cooperating to implement the above solutions are also provided below.

Referring to FIG. 6, an embodiment of the present invention provides a group call downlink data packet transmission system 600, which may include:

The control module 610 is configured to enable the core network device to establish a multicast distribution tree for the group that initiates the group call when receiving the group call request, where the multicast distribution tree uses the core network device as a multicast source. At least one base station to which the plurality of terminals in the group belong is a leaf node;

The transmitting module 620 is configured to enable the core network device to send the group call downlink data packet to the multicast distribution Distributing the tree to the at least one base station, so that the group call downlink data packet is forwarded by the at least one base station to the multiple terminals;

The control module 610 is further configured to: when the core network device ends, delete the multicast distribution tree.

In some embodiments, the control module 610 includes:

An address allocation unit 6101, configured to enable the core network device to allocate a multicast address in the bearer network for the group;

An address delivery unit 6102, configured to send the multicast address to the at least one base station;

The triggering unit 6103 is configured to trigger the at least one base station to join the multicast according to the multicast address, and establish the multicast distribution tree.

In some embodiments, the triggering unit 6103 is specifically configured to trigger the at least one base station to apply for joining multicast to each of the upper-level routers in the bearer network according to the multicast address, so that the bearer network The routers at all levels establish the multicast distribution tree.

In some embodiments, the transmission module 620 includes:

The receiving unit 6201 is configured to: after the group initiates the group call, enable the core network device to receive the group call downlink data packet sent by the data source in a unicast manner;

The setting unit 6202 is configured to enable the core network device to set a destination address of an outermost IP header of the group call downlink data packet to a multicast address of the group;

The sending unit 6203 is configured to enable the core network device to send the group call downlink data packet that is configured to be sent to the bearer network along the multicast distribution tree, so that the group call downlink data packet is in the bearer network. The multicast distribution tree is distributed to the at least one base station.

In some embodiments, the control module 610 further includes:

The indicating unit 6104 is configured to enable the core network device to instruct the at least one base station to quit the multicast when the group call ends, and complete the deletion of the multicast distribution tree.

It is to be understood that the functions of the various functional modules of the system in the embodiments of the present invention may be specifically implemented according to the method in the foregoing method embodiments. For the specific implementation process, reference may be made to the related description in the foregoing method embodiments, and details are not described herein again.

It can be seen from the above that in some feasible embodiments of the present invention, by receiving a group call request, The multicast distribution tree is dynamically established, and the multicast transmission mode is adopted between the core network and the base station, which can increase the number of group calls used by the bearer network, reduce the bandwidth consumption of the bearer network, and effectively improve the transmission efficiency of the bearer network. And core network performance to increase the capacity and performance of cluster services.

Referring to FIG. 7, an embodiment of the present invention further provides a core network device 700, which may include:

a processor 701, a memory 702, a bus 703, and a communication interface 704; the memory 702 is configured to store a program 705, the processor 701 is connected to the memory 702 via the bus 703, when the core network device 700 is running The processor 701 executes the program 705 stored by the memory 702 to enable the core network device 700 to perform the group call downlink data packet transmission method as described in the foregoing embodiments.

The bus 703 may be an Industry Standard Architecture (ISA) bus or a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA). Bus, etc. The bus can be divided into one or more of an address bus, a data bus, and a control bus. For ease of representation, only one thick line is shown in the figure, but it does not mean that there is only one or one type of bus.

The memory 702 is configured to store executable program code, the program code including computer operating instructions. The memory 702 may include a high speed RAM (Ramdom Access Memory) memory. Optionally, the memory 702 may further include a non-volatile memory. For example, the memory 702 can include a disk storage.

The processor 701 may be a central processing unit (CPU), or the processor 801 may be an Application Specific Integrated Circuit (ASIC), or the processor 701 may Is one or more integrated circuits that are configured to implement embodiments of the present invention.

The core network device in the embodiment of the present invention may be, for example, a core network gateway, a switch, or the like. The function of each function module of the core network device may be specifically implemented according to the method in the foregoing method embodiment. For the specific implementation process, reference may be made to the related description in the foregoing method embodiments, and details are not described herein again.

It can be seen that, in some feasible implementation manners of the present invention, by dynamically establishing a multicast distribution tree when receiving a group call request, a multicast transmission mode between the core network and the base station is implemented, which can effectively improve the bearer network. Transmission efficiency and core network performance to increase the capacity and performance of cluster services.

Embodiments of the present invention also provide a computer readable storage medium storing one or more programs, the one or more programs including instructions, when executed by a core network device including one or more processors, The core network device is configured to perform the group call downlink data packet transmission method as described in the foregoing embodiments.

In addition, the present invention also provides a corresponding group call service processing system, including the above core network device, and a bearer network and a base station. For a specific implementation, reference may be made to the corresponding description of the method above.

In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not described in detail in a certain embodiment can be referred to the related description of other embodiments.

It should be noted that the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The method and system for transmitting a group call downlink data packet provided by the embodiment of the present invention are described in detail. The principles and implementation manners of the present invention are described in the following. The description of the foregoing embodiment is only used for To help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. It should not be construed as limiting the invention.

Claims

A group call downlink data packet transmission method, which is characterized in that:

When receiving the group call request, the core network device establishes a multicast distribution tree for the group that initiates the group call, where the multicast distribution tree uses the core network device as a multicast source, and multiple At least one base station to which the terminal belongs is a leaf node;

The core network device distributes the group call downlink data packet to the at least one base station via the multicast distribution tree, so that the group call downlink data packet is forwarded by the at least one base station to the multiple terminals;

The core network device deletes the multicast distribution tree when the group call ends.
The method according to claim 1, wherein when the core network device receives the group call request, establishing a multicast distribution tree for the group that initiates the group call includes:

The core network device allocates a multicast address to the group in the bearer network, and sends the multicast address to the at least one base station, and triggers the at least one base station to join the multicast according to the multicast address. The multicast distribution tree is established.
The method according to claim 1 or 2, wherein the core network device distributing the group call downlink data packet to the at least one base station via the multicast distribution tree comprises:

Receiving, by the core network device, a group call downlink data packet sent from a data source in a unicast manner;

The core network device sets a destination address of an outermost IP header of the group call downlink data packet to a multicast address of the group;

The core network device sends the group call downlink data packet that is configured as described above to the bearer network along the multicast distribution tree, so that the group call downlink data packet is along the multicast distribution tree in the bearer network. Distributed to the at least one base station.
The method according to claim 1 or 2, wherein, when the core network device ends the group call, deleting the multicast distribution tree includes:

The core network device instructs the at least one base station to quit the multicast at the end of the group call, and completes deleting the multicast distribution tree.
A group call downlink data packet transmission system, comprising:

a control module, configured to: when the core network device receives the group call request, establish a multicast distribution tree for the group that initiates the group call, where the multicast distribution tree uses the core network device as a multicast source, In the group At least one base station to which the plurality of terminals belong is a leaf node;

a transmitting module, configured to enable the core network device to distribute the group call downlink data packet to the at least one base station by using the multicast distribution tree, so that the group call downlink data packet is forwarded by the at least one base station to the Multiple terminals;

The control module is further configured to: when the core network device ends the group call, delete the multicast distribution tree.
The system of claim 5 wherein said control module comprises:

An address allocation unit, configured to enable the core network device to allocate a multicast address in the bearer network for the group;

An address sending unit, configured to send the multicast address to the at least one base station;

And a triggering unit, configured to trigger the at least one base station to join the multicast according to the multicast address, and establish the multicast distribution tree.
The system of claim 5 or claim 6, wherein the transmission module comprises:

a receiving unit, configured to enable the core network device to receive a group call downlink data packet sent from a data source in a unicast manner;

a setting unit, configured to enable the core network device to set a destination address of an outermost IP header of the group call downlink data packet to a multicast address of the group;

a sending unit, configured to enable the core network device to send the group call downlink data packet that is configured to be sent to the bearer network along the multicast distribution tree, so that the group call downlink data packet is located in the bearer network The multicast distribution tree is distributed to the at least one base station.
A system according to claim 5 or claim 6 wherein:

The control module further includes: an instructing unit, configured to: when the group call ends, instruct the at least one base station to quit the multicast, and complete the deletion of the multicast distribution tree.
A core network device, wherein the core network device includes a processor, a memory, a bus, and a communication interface; the memory is configured to store a program, and the processor is connected to the memory through the bus. When the core network device is in operation, the processor executes the program stored in the memory, so that the core network device performs the group call downlink data packet transmission method according to any one of claims 1-4.
A group call service processing system, comprising the core network device as claimed in claim 9, and a bearer network and a base station.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions that, when executed by a core network device comprising one or more processors, cause the core network device The group call downlink data packet transmission method according to any one of claims 1 to 4.