Enhanced multimedia broadcast multicast service data transmission method and device

Abstract

The embodiment of the present invention provides an enhanced multimedia broadcast multicast service data transmission method and device, which obtains the service request of the upper-layer service application of the critical mission call to establish a multicast bearer with the broadcast multicast service center; parses the service request, determines the data transmission area range of the enhanced multimedia broadcast multicast service corresponding to the service request; establishes a multicast bearer matching each hierarchical area; responds to the establishment of the multicast bearer of each hierarchical area, and performs data transmission matching the service request based on the delay value matching each hierarchical area. In the present invention, the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching it. Multicast bearers are established for different hierarchical areas respectively, which can ensure the user's service quality requirements and effectively improve the overall system performance of MCPTT.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to an enhanced multimedia broadcast multicast service (eMBMS) data transmission method and device. Background Art

[0002] The 3GPP (3rd Generation Partnership Project) standards organization has established the SA6 Mission Critical working group to support emergency communications services, mainly to develop MCPTT (Mission Critical Push To Talk) and related technical standards.

[0003] For MCPTT group calls, downlink multicast is implemented using eMBMS (enhanced Multimedia Broadcast Multicast Service) technology. Since the MBSFN (Multicast Broadcast Single Frequency Network) mechanism on the air interface has limitations on data synchronization of multiple base stations, when the group is large, the overall downlink transmission performance is limited by the base station with the largest delay, which will affect the overall MCPTT service delay performance. Summary of the invention

[0004] In view of this, the embodiments of the present invention provide an enhanced multimedia broadcast multicast service data transmission method and apparatus to effectively improve the overall system performance of MCPTT.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] An enhanced multimedia broadcast multicast service data transmission method, the method comprising:

[0007] Obtain the service request of the upper-layer service application of the mission-critical call to establish a multicast bearer with the broadcast multicast service center;

[0008] Parsing the service request to determine a data transmission area range of an enhanced multimedia broadcast multicast service corresponding to the service request, wherein the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching the hierarchical area;

[0009] Establishing a multicast bearer matching each hierarchical area;

[0010] In response to the multicast bearer being established in each hierarchical area, data transmission matching the service request is performed according to the delay value matching each hierarchical area.

[0011] Optionally, the method further comprises:

[0012] The base station range is divided according to the link status information between the base station and the core network to obtain at least one hierarchical area, wherein each hierarchical area corresponds to a different delay value.

[0013] Optionally, dividing the base station range according to the link status information between the base station and the core network to obtain at least one hierarchical area includes:

[0014] Obtain the distance between each base station and the core network and network transmission information;

[0015] The base stations are divided according to the distance and the network transmission information, and the base stations with matching distance and network transmission information are divided into the same classification area.

[0016] Optionally, parsing the service request to determine a data transmission range of the enhanced multimedia broadcast multicast service corresponding to the service request includes:

[0017] Parsing the service request to obtain multimedia broadcast multicast service area parameters;

[0018] Based on the multimedia broadcast multicast service service area parameters, a data transmission range of the enhanced multimedia broadcast multicast service corresponding to the service request is determined.

[0019] Optionally, the establishing a multicast bearer matching each hierarchical area includes:

[0020] comparing the data transmission area range with preconfigured classification areas;

[0021] If the data transmission area covers multiple hierarchical areas, a multicast bearer matching each hierarchical area is established respectively.

[0022] Optionally, the method further comprises:

[0023] In response to receiving data transmitted from a plurality of hierarchical areas, merging the data to obtain target data;

[0024] The target data is sent to a destination.

[0025] Optionally, the method further comprises:

[0026] In response to adding a new base station, obtaining link status information between the new base station and the core network;

[0027] The hierarchical area to which the new base station belongs is determined according to the link status information between the new base station and the core network, so that the new base station is added to the corresponding hierarchical area.

[0028] An enhanced multimedia broadcast multicast service data transmission device, the device comprising:

[0029] An acquisition unit, used for acquiring a service request of an upper layer service application of a mission-critical call to establish a multicast bearer with a broadcast multicast service center;

[0030] A determination unit, configured to parse the service request and determine a data transmission area range of an enhanced multimedia broadcast multicast service corresponding to the service request, wherein the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matched therewith;

[0031] An establishing unit, used for establishing a multicast bearer matching each hierarchical area;

[0032] The transmission unit is used for transmitting data matching the service request according to the delay value matching each hierarchical area in response to the establishment of the multicast bearer of each hierarchical area.

[0033] Optionally, the device further comprises:

[0034] The area division unit is used to divide the base station range according to the link status information between the base station and the core network to obtain at least one hierarchical area, wherein each hierarchical area corresponds to a different delay value.

[0035] A core network server, comprising:

[0036] A processor is used to execute the program, wherein the program is specifically used to:

[0037] Obtain the service request of the upper-layer service application of the mission-critical call to establish a multicast bearer with the broadcast multicast service center;

[0038] Parsing the service request to determine a data transmission area range of an enhanced multimedia broadcast multicast service corresponding to the service request, wherein the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching the hierarchical area;

[0039] Establishing a multicast bearer matching each hierarchical area;

[0040] In response to the multicast bearer being established in each hierarchical area, data transmission matching the service request is performed according to the delay value matching each hierarchical area.

[0041] Compared with the prior art, the embodiments of the present invention provide an enhanced multimedia broadcast multicast service data transmission method and device, which obtains the service request of the upper-layer service application of the critical mission call and the broadcast multicast service center to establish a multicast bearer; parses the service request, determines the data transmission area range of the enhanced multimedia broadcast multicast service corresponding to the service request; establishes a multicast bearer matching each hierarchical area; after the multicast bearer of each hierarchical area is established, data transmission matching the service request is performed according to the delay value matching each hierarchical area. In the present invention, the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching it. Multicast bearers are established for different hierarchical areas respectively, which can ensure the user's service quality requirements and effectively improve the overall system performance of MCPTT. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0043] Figure 1 A schematic diagram of a flow chart of a method for transmitting data of an enhanced multimedia broadcast multicast service provided by an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of classifying base station ranges provided by an embodiment of the present invention;

[0045] Figure 3 A schematic diagram of a service processing flow of a multicast bearer service involving two areas provided by an embodiment of the present invention;

[0046] Figure 4 A schematic diagram of the structure of an enhanced multimedia broadcast multicast service data transmission device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The terms "first" and "second" in the specification and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0049] The embodiment of the present invention provides an enhanced multimedia broadcast multicast service data transmission method, wherein eMBMS is an enhanced multimedia broadcast multicast service provided by a long term evolution (LTE) network. The eMBMS technology refers to a point-to-multipoint service in which a data source sends data to multiple users by sharing a transmission link.

[0050] See also Figure 1 , the method may include the following steps:

[0051] S101. Obtain a service request from an upper-layer service application of a mission-critical call to establish a multicast bearer with a broadcast multicast service center.

[0052] MCPTT (Mission Critical Push To Talk) is an all-IP application layer service protocol running on the LTE network. It is an enhanced PTT service suitable for scenarios where critical tasks are performed. It supports authentication, group attachment, group management, group calls, single calls, priority calls, speaking rights control, location reporting and other functions. MCPTT's AS (Application Server) sends an Activate MBMS Bearer Request to the BM-SC (Broadcast Multicast Service Center), i.e., requests to establish a multicast bearer. The core network server, which can also be BM-SC, will obtain the upper-layer service application of the critical mission call and apply the service request of the broadcast multicast service center to establish a multicast bearer. Among them, BM-SC is deployed in the EPC (core network) to perform service control on broadcast multicast.

[0053] S102: Analyze the service request to determine a data transmission area range of an enhanced multimedia broadcast multicast service corresponding to the service request.

[0054] The data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value that matches it. Usually, a parameter identifying the service area range is carried in the service request, and the corresponding service area range can be obtained by parsing the parameter. The service range mainly refers to the base station range involved. In the embodiment of the present invention, regional classification is performed according to the base station range, that is, each hierarchical area includes several base stations, and these base stations have the same delay value.

[0055] S103: Establish a multicast bearer matching each hierarchical area.

[0056] S104: In response to the establishment of the multicast bearer for each hierarchical area, data transmission matching the service request is performed according to the delay value matching each hierarchical area.

[0057] Since the data transmission area includes at least one hierarchical area, if the current data transmission spans multiple hierarchical areas, multicast bearers are established in each area respectively. For example, the hierarchical area includes hierarchical area I and hierarchical area II. Then BM-SC will establish multicast bearers in hierarchical area I according to the standard process, and establish multicast bearers in hierarchical area II according to the standard process, wherein the standard process refers to the process of establishing multicast bearers, and bearers can be understood as data transmission channels, that is, different data transmission channels are established in different hierarchical areas. After the multicast bearers of each hierarchical area are established, downlink data transmission is performed according to the delay values ​​of their respective hierarchical areas.

[0058] The embodiment of the present invention provides an enhanced multimedia broadcast multicast service data transmission method, which obtains the service request of the upper-layer service application of the critical mission call to establish a multicast bearer with the broadcast multicast service center; parses the service request to determine the data transmission area range of the enhanced multimedia broadcast multicast service corresponding to the service request; establishes a multicast bearer matching each hierarchical area; after the multicast bearer of each hierarchical area is established, data transmission matching the service request is performed according to the delay value matching each hierarchical area. In the present invention, the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching it. Multicast bearers are established for different hierarchical areas respectively, which can ensure the user's service quality requirements and effectively improve the overall system performance of MCPTT.

[0059] In the embodiment of the present invention, the base station range is divided into multiple levels of areas, each level area corresponds to a different delay value. Specifically, the base station range can be divided according to the link status information between the base station and the core network to obtain at least one level area.

[0060] The functions of the core network (CN) are mainly to provide user connection, user management and service bearing, and to provide an interface to the external network as a bearer network. When performing regional classification, it is mainly based on the link status between the base station and the core network, such as 10ms for one level and 30ms for another level. Correspondingly, the link status information between the base station and the core network can be reflected by the geographical location of the base station, and the distance information between the base station and the core network can be obtained, or the transmission distance between the two can be determined based on the network transmission information between the base station and the core network. Specifically, the distance and network transmission information between each base station and the core network are obtained; each base station is divided according to the distance and network transmission information, and the base stations with matching distances and network transmission information are divided into the same classification area.

[0061] See also Figure 2 , which shows a schematic diagram of classifying base station ranges provided by an embodiment of the present invention. Figure 2 In the illustrated embodiment, the base station range is divided into three levels, including level I, level II and level III. Different delay values ​​are set for different areas, a lower delay value is set for the area close to the core network, a medium delay value is set for the middle area, and a larger delay value is set for the area far from the core network. Multiple levels of delay values ​​can be set according to the scale of the network.

[0062] When activating the eMBMS bearer, if the SA (broadcast service area) specified by the MCPTT AS (upper layer service application) belongs to one of the areas, such as the level I area, the corresponding delay value is used for SYNC (synchronization protocol) data transmission. If the SA specified by the MCPTT AS spans multiple areas, such as level I and II areas, when the BM-SC receives the bearer activation request from the MCPTT AS, it will establish sessions in the level I area and the level II area respectively, thereby activating different bearers in different areas, and different delay values ​​are used for data transmission for the level I area and level II area bearers respectively.

[0063] In a possible implementation manner, parsing the service request to determine a data transmission range of the enhanced multimedia broadcast multicast service corresponding to the service request includes:

[0064] Parsing the service request to obtain multimedia broadcast multicast service area parameters;

[0065] Based on the multimedia broadcast multicast service service area parameters, a data transmission range of the enhanced multimedia broadcast multicast service corresponding to the service request is determined.

[0066] Specifically, the establishing of a multicast bearer matching each hierarchical area includes:

[0067] comparing the data transmission area range with preconfigured classification areas;

[0068] If the data transmission area covers multiple hierarchical areas, a multicast bearer matching each hierarchical area is established respectively.

[0069] The embodiment of the present invention also includes: in response to receiving data transmitted by multiple hierarchical areas, merging the data to obtain target data; and sending the target data to a destination.

[0070] For example, for users moving across regions, data from two MBMS bearers can be received simultaneously and merged and deduplicated to ensure the continuity of user data.

[0071] The embodiment of the present invention also includes:

[0072] In response to adding a new base station, obtaining link status information between the new base station and the core network;

[0073] The hierarchical area to which the new base station belongs is determined according to the link status information between the new base station and the core network, so that the new base station is added to the corresponding hierarchical area.

[0074] This ensures that when more base stations are deployed, the delay processing of existing hierarchical base stations is not affected.

[0075] See also Figure 3 , which shows a schematic diagram of a service processing flow of a multicast bearer service involving two areas provided by an embodiment of the present invention.

[0076] exist Figure 3 In the figure, eNodeB I represents base station I in LTE, eNodeB II represents base station II in LTE, MME represents mobility management node, MBMS-GW represents multimedia broadcast multicast service core network, BM-SC represents broadcast multicast service center, MCPTT AS represents mission-critical call upper layer service application, For Region I represents level I region, and For Region II represents level II region.

[0077] Correspondingly, Figure 3 The meaning of the messages passed in are as follows:

[0078] Activate MBMS Bearer Request indicates activation of multimedia broadcast multicast service bearer request;

[0079] Activate MBMS Bearer Response is a response message to the request to activate the multimedia broadcast multicast service bearer.

[0080] MBMS Service Area indicates the scope of the service area;

[0081] Check Service Areas means checking the scope of service areas;

[0082] Session start request indicates a session start request;

[0083] Session start response indicates a session start response.

[0084] The business processing process is as follows:

[0085] Step 1: The MCPTT AS sends an Activate MBMS Bearer Request message to the BM-SC to request the establishment of a multicast bearer, carrying an MBMS Service Area parameter indicating the service area range.

[0086] Step 2: BM-SC responds to the MCPPT AS with an Activate MBMS Bearer Response message;

[0087] Step 3: BM-SC checks the scope of the Service Areas and compares it with the configured hierarchical areas. When the Service Areas span multiple areas, multicast bearers are established in each area.

[0088] Steps 4 to 9: BM-SC establishes a multicast bearer in hierarchical area I according to the standard process;

[0089] Steps 4a to 9a: BM-SC establishes a multicast bearer in hierarchical area II according to standard procedures.

[0090] After the multicast bearer of each hierarchical area is established, downlink data transmission is performed according to the delay value of each hierarchical area.

[0091] Compared with the prior art, the SYNC protocol is used between BM-SC and eNodeB to support the synchronous transmission of MBMS user data. In order to ensure that all eNodeBs can synchronously receive and send data, the maximum transmission delay between BM-SC and all eNodeBs needs to be calculated when BM-SC sends data. At the same time, in order to ensure that all base stations send data at the same time, base stations closer to the core network also need to cache user data for a longer time. In the embodiment of the present invention, the eMBMS multicast transmission area is graded, and different levels of areas are configured with different delay values; MBMS bearers are established for different levels of areas, and the configured values ​​are used for SYNC data transmission. For users moving across regions, data from two MBMS bearers can be received at the same time, and merged and deduplicated to ensure the continuity of user data. The present invention can effectively improve the overall system performance, and even in extreme scenarios, it can guarantee the QoS (Quality of Service) requirements of most users. When the system scope in the prior art is expanded, the base station deployment range increases, and the maximum delay of the base station will exceed the budget, so that all MCPTT services will not meet the MCPTT service QCI requirements. The present invention is also conducive to system expansion. When more base stations are deployed, it does not affect the delay processing of the existing hierarchical base stations.

[0092] See also Figure 4 , which shows an enhanced multimedia broadcast multicast service data transmission device provided by an embodiment of the present invention, the device comprising:

[0093] An acquisition unit 10 is used to acquire a service request from an upper layer service application of a mission-critical call to establish a multicast bearer with a broadcast multicast service center;

[0094] A determination unit 20 is used to parse the service request and determine a data transmission area range of the enhanced multimedia broadcast multicast service corresponding to the service request, wherein the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching the hierarchical area;

[0095] An establishing unit 30, configured to establish a multicast bearer matching each hierarchical area;

[0096] The transmission unit 40 is configured to transmit data matching the service request according to a delay value matching each hierarchical area in response to the establishment of the multicast bearer in each hierarchical area.

[0097] Optionally, the device further comprises:

[0098] The area division unit is used to divide the base station range according to the link status information between the base station and the core network to obtain at least one hierarchical area, wherein each hierarchical area corresponds to a different delay value.

[0099] Optionally, the area division unit is specifically used to:

[0100] Obtain the distance between each base station and the core network and network transmission information;

[0101] The base stations are divided according to the distance and the network transmission information, and the base stations with matching distance and network transmission information are divided into the same classification area.

[0102] Correspondingly, the determining unit includes:

[0103] A parsing subunit, used to parse the service request to obtain a multimedia broadcast multicast service service area parameter;

[0104] The determination subunit is used to determine the data transmission range of the enhanced multimedia broadcast multicast service corresponding to the service request based on the multimedia broadcast multicast service service area parameter.

[0105] Optionally, the establishing unit includes:

[0106] A comparison subunit, used to compare the data transmission area range with a preconfigured grading area;

[0107] The establishing subunit is used to establish a multicast bearer matching each hierarchical area if the data transmission area covers multiple hierarchical areas.

[0108] Optionally, the device further comprises:

[0109] A processing unit, configured to, in response to receiving data transmitted by a plurality of hierarchical regions, merge the data to obtain target data;

[0110] The sending unit is used to send the target data to a destination end.

[0111] Optionally, the device further comprises an expansion unit, wherein the expansion unit is configured to:

[0112] In response to adding a new base station, obtaining link status information between the new base station and the core network;

[0113] The hierarchical area to which the new base station belongs is determined according to the link status information between the new base station and the core network, so that the new base station is added to the corresponding hierarchical area.

[0114] The embodiment of the present invention provides an enhanced multimedia broadcast multicast service data transmission device, wherein an acquisition unit acquires a service request for an upper-layer service application of a critical mission call to establish a multicast bearer with a broadcast multicast service center; a determination unit parses the service request and determines the data transmission area range of the enhanced multimedia broadcast multicast service corresponding to the service request; an establishment unit establishes a multicast bearer matching each hierarchical area; and after the transmission unit responds to the establishment of the multicast bearer of each hierarchical area, it performs data transmission matching the service request according to the delay value matching each hierarchical area. In the present invention, the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching therewith. Multicast bearers are established for different hierarchical areas respectively, which can ensure the user's service quality requirements and effectively improve the overall system performance of MCPTT.

[0115] The embodiment of the present invention further requires a core network server, including:

[0116] A processor, which is used to store programs;

[0117] A processor is used to execute the program, wherein the program is specifically used to:

[0118] Obtain the service request of the upper-layer service application of the mission-critical call to establish a multicast bearer with the broadcast multicast service center;

[0119] Parsing the service request to determine a data transmission area range of an enhanced multimedia broadcast multicast service corresponding to the service request, wherein the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching the hierarchical area;

[0120] Establishing a multicast bearer matching each hierarchical area;

[0121] In response to the multicast bearer being established in each hierarchical area, data transmission matching the service request is performed according to the delay value matching each hierarchical area.

[0122] The program is also used to execute any operation step of the above-mentioned enhanced multimedia broadcast multicast service transmission method.

[0123] The professionals may further appreciate that the units and model steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0124] The steps of the method or model described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a WD-ROM, or any other form of storage medium known in the art.

[0125] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An enhanced multimedia broadcast multicast service data transmission method, characterized in that: The method comprises: Obtain the service request of the upper-layer service application of the mission-critical call to establish a multicast bearer with the broadcast multicast service center; Parsing the service request to determine a data transmission area range of an enhanced multimedia broadcast multicast service corresponding to the service request, wherein the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching the hierarchical area; Establishing a multicast bearer matching each hierarchical area; In response to the establishment of a multicast bearer for each hierarchical area, data transmission matching the service request is performed according to a delay value matching each hierarchical area; The step of establishing a multicast bearer matching each hierarchical area includes: comparing the data transmission area range with preconfigured classification areas; If the data transmission area covers multiple hierarchical areas, a multicast bearer matching each hierarchical area is established respectively.

2. The method according to claim 1, characterized in that The method further comprises: The base station range is divided according to the link status information between the base station and the core network to obtain at least one hierarchical area, wherein each hierarchical area corresponds to a different delay value.

3. The method according to claim 2, characterized in that The step of dividing the base station range according to the link status information between the base station and the core network to obtain at least one hierarchical area includes: Obtain the distance information between each base station and the core network; The base stations are divided according to the distance information, and base stations with matching distance information are divided into the same hierarchical area.

4. The method according to claim 1, characterized in that: The parsing the service request to determine the data transmission range of the enhanced multimedia broadcast multicast service corresponding to the service request includes: Parsing the service request to obtain multimedia broadcast multicast service area parameters; Based on the multimedia broadcast multicast service service area parameters, a data transmission range of the enhanced multimedia broadcast multicast service corresponding to the service request is determined.

5. The method according to claim 1, characterized in that The method further comprises: In response to receiving data transmitted from a plurality of hierarchical areas, merging the data to obtain target data; The target data is sent to a destination.

6. The method according to claim 2, characterized in that The method further comprises: In response to adding a new base station, obtaining link status information between the new base station and the core network; The hierarchical area to which the new base station belongs is determined according to the link status information between the new base station and the core network, so that the new base station is added to the corresponding hierarchical area.

7. An enhanced multimedia broadcast multicast service data transmission device, characterized in that: The device comprises: An acquisition unit, used for acquiring a service request of an upper layer service application of a mission-critical call to establish a multicast bearer with a broadcast multicast service center; A determination unit, configured to parse the service request and determine a data transmission area range of an enhanced multimedia broadcast multicast service corresponding to the service request, wherein the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matched therewith; An establishing unit, used for establishing a multicast bearer matching each hierarchical area; A transmission unit, configured to transmit data matching the service request according to a delay value matching each hierarchical area in response to establishment of a multicast bearer in each hierarchical area; The establishing unit establishes a multicast bearer matching each hierarchical area, including: comparing the data transmission area range with preconfigured classification areas; If the data transmission area covers multiple hierarchical areas, a multicast bearer matching each hierarchical area is established respectively.

8. The device according to claim 7, characterized in that The device also includes: The area division unit is used to divide the base station range according to the link status information between the base station and the core network to obtain at least one hierarchical area, wherein each hierarchical area corresponds to a different delay value.

9. A core network server, characterized in that: include: A processor, which is used to store programs; A processor is used to execute the program, wherein the program is specifically used to: Obtain the service request of the upper-layer service application of the mission-critical call to establish a multicast bearer with the broadcast multicast service center; Parsing the service request to determine a data transmission area range of an enhanced multimedia broadcast multicast service corresponding to the service request, wherein the data transmission area range includes at least one hierarchical area, and each hierarchical area corresponds to a delay value matching the hierarchical area; Establishing a multicast bearer matching each hierarchical area; In response to the establishment of a multicast bearer for each hierarchical area, data transmission matching the service request is performed according to a delay value matching each hierarchical area; The step of establishing a multicast bearer matching each hierarchical area includes: comparing the data transmission area range with preconfigured classification areas; If the data transmission area covers multiple hierarchical areas, a multicast bearer matching each hierarchical area is established respectively.

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