TWI724791B - Method for configuring multicast broadcast service and central controller - Google Patents

Abstract

The invention provides a method for configuring a multicast broadcast service and a central controller, which can optimize the configuration of a multicast broadcast service and a point-to-point service in a network environment where the size of a single-frequency network can be adjusted to improve the efficiency of the use of base station resources.

Description

Method for configuring broadcast group broadcasting service and central controller

The present invention relates to a multimedia service configuration technology, and particularly relates to a method and a central controller for configuring a broadcast group broadcast service.

Audio-visual streaming services are the trend of future network applications, and network traffic will be greatly increased. Broadcast and multicast services can effectively reduce the use of wireless resources. Therefore, broadcast and multicast services are one of the important issues for future wireless networks.

Please refer to FIG. 1, which is a schematic diagram of a conventional service program (session) corresponding to multimedia content provided by a base station to a user device. As shown in FIG. 1, the base stations 110, 120, 130a, and 103b can be controlled by a central controller 199 (which is, for example, a MultiCell/Multicast Coordination Entity (MCE), where the base station 110 can provide tools Unicast (UNI) service programs are provided to user devices within the coverage area 112; base station 120 can provide service programs in the form of single cell point to multipoint (SCPTM) to users within the coverage area 122 Device: The base stations 130a and 130b can cooperate to provide a service program in the form of multicast broadcast single frequency network (MBSFN) to the user devices within the coverage area 132.

However, for multiple unicast service programs corresponding to the same multimedia content, if these service programs can be combined in a timely manner, it should be able to effectively improve the efficiency of related resource allocation.

In view of this, the present invention provides a method and a central controller for configuring broadcast multicast services, which can be used to solve the above technical problems.

The present invention provides a method for configuring a broadcast multicast service, which is suitable for a central controller, and includes: in response to determining that an initial request for requesting a first multimedia service is received from a first user device, determining the first multimedia service Whether a first base station of a user device has provided a first service program corresponding to the first multimedia service; in response to determining that the first base station has provided the first service program, it is determined whether the first service program conforms to the first service program A service quality requirement of the user device; responding to determining that the first service program meets the service quality requirements of the first user device, and obtaining the transmission form of the first service program; responding to determining that the transmission form of the first service program belongs to a unicast format, Control the first base station to end the first service program and start a second service program corresponding to the first multimedia service, where the second service program belongs to a single-cell mass broadcast form; control the first base station to perform the second service The program is provided to the first user device.

The invention provides a central controller including a storage circuit and a processor. The storage circuit stores multiple modules. The processor is coupled to the storage circuit and accesses the aforementioned module to perform the following steps: in response to determining that an initial request for requesting a first multimedia service is received from a first user device, determining to serve the first user device Whether a first base station has provided a first service program corresponding to the first multimedia service; in response to determining that the first base station has provided the first service program, it is determined whether the first service program conforms to the first user device A service quality requirement; responding to determining that the first service program meets the service quality requirements of the first user device, and obtaining the transmission form of the first service program; responding to determining that the transmission form of the first service program belongs to a unicast format, controlling the first The base station ends the first service program and starts a second service program corresponding to the first multimedia service, where the second service program belongs to a single-cell multicast mode; controls the first base station to provide the second service program to The first user device.

Please refer to FIG. 2, which is a schematic diagram of a central controller according to an embodiment of the present invention. In the embodiment of the present invention, the central controller 200 is, for example, an MCE, and it can be connected to a server for storing various multimedia contents, but it is not limited to this. As shown in FIG. 2, the central controller 200 includes a storage circuit 202 and a processor 204.

The storage circuit 202 is, for example, any type of fixed or removable random access memory (Random Access Memory, RAM), read-only memory (Read-Only Memory, ROM), flash memory (Flash memory), hard disk Disk or other similar devices or a combination of these devices can be used to record multiple codes or modules.

The processor 204 is coupled to the storage circuit 202, and can be a general purpose processor, a special purpose processor, a traditional processor, a digital signal processor, multiple microprocessors, one or more combined digital signal processing Microprocessor, controller, microcontroller, Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA), any other type of integrated circuit , State machines, processors based on Advanced RISC Machine (ARM) and similar products.

In the embodiment of the present invention, the processor 204 can access the modules and program codes recorded in the storage circuit 202 to implement the method for configuring the broadcast multicast service proposed by the present invention. The details are as follows.

Please refer to FIG. 3, which is a flowchart of a method for configuring a broadcast multicast service according to the first embodiment of the present invention. The method of this embodiment can be executed by the central controller 200 in FIG. 2. The details of each step in FIG. 3 are described below with the components shown in FIG. 2.

First, in step S311, the processor 204 may receive an initial request for requesting the first multimedia service from the first user device. In the embodiment of the present invention, the various user devices mentioned may be electronic devices that can be used to receive service programs of various multimedia services, such as mobile phones, tablet computers, etc., but are not limited thereto. In addition, in different embodiments, the mentioned multimedia service may be an audiovisual streaming service, and a single multimedia service may include one or more service programs, but the present invention may not be limited thereto.

Next, in step S312, the processor 204 may determine whether the first base station serving the first user device (that is, the serving base station of the first user device) has provided the first service program corresponding to the first multimedia service, If step S313 can be executed, otherwise, step S318 can be executed.

In step S313, the processor 204 may determine whether the considered service program (for example, the first service program) meets the service quality requirements of the first user device, if it is, step S314 may be executed, and if not, step S317 may be executed.

In step S314, the processor 204 may obtain the transmission form of the considered service program (for example, the first service program). In the embodiment of the present invention, the mentioned transmission form may be UNI, SCPTM or MBSFN, but it may not be limited thereto.

In an embodiment, if the transmission form of the considered service program (for example, the first service program) is UNI, this means that the first user device cannot directly receive the service program. Therefore, the processor 204 may perform step S315 to control the first base station to end this service program and start another service program corresponding to the first multimedia service, and control the first base station to provide another service program to In the first user device, the transmission form of the above-mentioned another service program may belong to SCPTM.

In another embodiment, if the transmission form of the considered service program (for example, the first service program) is SCPTM or MBSFN, this means that the first user device can directly receive the service program. Therefore, the processor 204 can perform step S316 to control the first base station to provide the service program to the first user device.

In step S317, the processor 204 may determine whether the first base station serving the first user device additionally provides a third service program corresponding to the first multimedia service, and if so, it may return to step S313 to determine whether the third service program complies with The service quality requirement of the first user device, otherwise, step S318 may be performed. The details of step S313 can refer to the content of the previous embodiment, which will not be repeated here. Specifically, as mentioned earlier, one multimedia service can include multiple service programs. Therefore, if one service program of the first multimedia service cannot meet the service quality requirements of the first user device, the processor 204 can try to do so. Find out other service programs in the first multimedia service that can meet the service quality requirements of the first user device (for example, the above-mentioned third service program). In addition, if the first multimedia service does not have the aforementioned third service program, the processor 204 may execute step S318 and subsequent steps accordingly to try to configure a suitable service program for the first user device.

In step S318, the processor 204 may determine whether the second base station adjacent to the first base station has provided the third service program corresponding to the first multimedia service, if it is, step S319 may be performed, otherwise, step S320 may be performed.

In step S319, the processor 204 can determine whether the considered service program (for example, the third service program provided by the second base station) meets the service quality requirements of the first user device, if not, step S321 can be executed, otherwise, step S321 can be executed. S322.

In step S321, the processor 204 may determine whether the second base station additionally provides a service program corresponding to the first multimedia service, and if so, it may return to step S319 to determine whether the service program meets the service quality requirements of the first user device. Otherwise, step S320 may be executed.

In step S320, the processor 204 may initiate a fifth service program in a unicast format, and control the first base station to provide the fifth service program to the first user device. That is, if neither the first base station nor the neighboring second base station has an existing service program available, the processor 204 may additionally initiate a fifth service program for the first user device to serve the first user device .

In step S322, the processor 204 may obtain the transmission form of the considered service program (for example, the third service program provided by the second base station or other service programs corresponding to the first multimedia service).

In one embodiment, if the transmission form of the service program obtained by the processor 204 in step S322 belongs to UNI/SCPTM, step S323 can be executed accordingly to control the second base station to end the service program under consideration, and start corresponding to the first A fourth service program of a multimedia service, and controls the second base station to provide the fourth service program to the first user device, wherein the transmission form of the fourth service program may belong to MBSFN. That is, if the second base station already has an existing service program corresponding to the first multimedia service, and its transmission form belongs to UNI/SCPTM, the processor 204 can additionally start the fourth service program belonging to MBSFN to Serving the first user device served by the first base station.

In another embodiment, if the transmission form of the service program obtained by the processor 204 in step S322 belongs to MBSFN, step S324 may be executed accordingly to control the second base station to provide the third service program to the first user device. That is, since the first user device can receive the service program belonging to the MBSFN, the first user device can directly receive the service program described above without the processor 204 separately initiating any service program, but it is not limited to this.

It can be seen from the above that the method of the present invention can adaptively initiate a UNI service program or change the UNI service program to be provided in the form of SCPTM or MBSFN in a network environment where the size of a single frequency network can be adjusted. In this way, the broadcast group broadcasting service and the point-to-point service can be better configured to improve the efficiency of the base station's use of resources.

In addition, in other embodiments, the method of the present invention can also regularly or irregularly organize the resource allocation methods of each service program to further improve the efficiency of the base station's use of resources, as detailed below.

Please refer to FIG. 4, which is a flowchart of a method for configuring a broadcast multicast service according to a second embodiment of the present invention. The method of this embodiment can be executed by the central controller 200 in FIG. 2. The details of each step in FIG. 4 are described below in conjunction with the components shown in FIG. 2.

First, in step S411, the processor 204 can determine whether the provided multimedia services are all in the first updated state, if it is, step S412 can be performed, otherwise, step S413 can be performed.

In step S413, the processor 204 may find one of the aforementioned multimedia services that belongs to the first unupdated state as the reference multimedia service, where the reference multimedia service may include at least one reference service program.

After that, in step S414, the processor 204 can determine whether each reference service program is in the second updated state, if it is in the second updated state, step S425 can be executed, otherwise step S415 can be executed.

In step S415, the processor 204 may find the second unupdated state from the reference service program as the pending service program, and obtain the transmission form of the pending service program in step S416.

In one embodiment, if the transmission form of the service program to be processed belongs to UNI, the processor 204 may continue to execute step S417 to determine whether the service program to be processed can be combined with other service programs, if not, step S418 may be executed, and if so, step S418 may be executed. Step S419 is executed.

In step S418, the processor 204 may mark the service program to be processed as the second updated state, and return to step S414. On the other hand, in step S419, the processor 204 may combine the service program to be processed with other service programs as another service program to be processed, mark the other service program to be processed as the second unupdated state, and return to step S414.

In another embodiment, if the transmission form of the service program to be processed by the processor 204 in step S416 belongs to SCPTM or MBSFN, the processor 204 may continue to perform step S420 to determine whether the service program to be processed can be combined with other service programs. In combination, if it is, step S421 may be executed, otherwise, step S422 may be executed.

In step S421, the processor 204 may combine the service program to be processed with other service programs as another service program to be processed, mark the other service program to be processed as the second unupdated state, and return to step S414.

In step S422, the processor 204 can determine whether the service program to be processed needs to be split into multiple service programs, if it is to execute step S423, otherwise, it can execute step S424.

In step S423, the processor 204 may split the service program to be processed into the aforementioned service programs, mark each service program as the second unupdated state, and return to step S414. On the other hand, in step S424, the processor 204 may mark the service program to be processed as the second updated state, and return to step S414.

After steps S414 to S424 are repeatedly performed, it should be possible to update each reference service program corresponding to the considered reference multimedia service to the second updated state. That is, each reference service program can no longer be split into multiple service programs or merged with other service programs. In this case, the processor 204 may continue to perform step S425 after performing step S414 to mark the considered multimedia service as the first updated state, which means that the reference service programs of this multimedia service are no longer available. Split into multiple service programs, or merge with other service programs.

Therefore, the processor 204 may return to step S411 after step S424 to determine whether the provided multimedia services are all in the first updated state. If not, the processor 204 may then perform steps S414 to S424 based on other multimedia services in the first non-updated state, until each provided multimedia service is in the first updated state.

In this case, the processor 204 may continue to perform step S412 to notify the respective user devices served by the related broadcast multicast service configuration, so that each user device can receive the UNI/SCPTM/MBSFN in a suitable manner. Service program, but the present invention may not be limited to this.

In addition, in some embodiments, if the user device wants to stop receiving the service program, the method of the present invention can also adjust the configured resources accordingly, as detailed below. Please refer to FIG. 5, which is a flowchart of a method for configuring a broadcast multicast service according to a third embodiment of the present invention. The method of this embodiment can be executed by the central controller 200 in FIG. 2. The details of each step in FIG. 5 are described below with the components shown in FIG. 2.

First, in step S511, in response to determining that the service base station serving the second user device has received an end service request for terminating the service program from the second user device, the processor 204 may obtain the transmission form of the service program.

In one embodiment, if the transmission form of the service program is UNI, the processor 204 may continue to execute step S512 to control the service base station serving the second user device to terminate the service program. That is, since the service program is originally received by the second user device alone, the processor 204 only needs to control the service base station to directly terminate the service program.

In another embodiment, if the transmission form of the service program is SCPTM, the processor 204 may continue to perform step S513 after step S511 to determine whether multiple other user devices are receiving the service program, and if so, perform step S513 S514, otherwise, perform step S515.

If the processor 204 determines in step S513 that multiple other user devices are receiving the above-mentioned service program, this means that the service program in the transmission form of SCPTM is still applicable, so the processor 204 can maintain the service program in step S514.

On the other hand, if the processor 204 determines in step S513 that multiple other user devices are not receiving the above service program, this means that only one other user device (named as user device A) is currently receiving the above service program, so processing The device 204 can perform step S515 to wait for a preset time (which can be determined by the designer as any length of time according to requirements), and in step S516 determines whether a user device starts to receive the above service program within the preset time, and if so, execute Step S514, otherwise, perform step S517.

Furthermore, if the processor 204 determines in step S516 that no user device has started to receive the service program within the preset time, it means that only one user device A is receiving the service program, so the transmission form is the service program of SCPTM It may no longer be applicable. Therefore, the processor 204 can control the base station to terminate the aforementioned service program and start another service program in the unicast format in step S517, so that the user device A can receive the other service program in the unicast format.

On the other hand, if the processor 204 determines in step S516 that the user device has started to receive the above service program within the preset time, this means that the service program in the transmission form of SCPTM is still applicable, so the processor 204 can maintain in step S514 This service program.

In another embodiment, if the transmission form of the above service program belongs to MBSFN, the processor 204 may continue to perform step S518 after step S511 to find out multiple user devices receiving the service program, and determine the status of each user device Whether the neighboring base station participates in providing this service program, if it is, step S519 may be performed, otherwise, step S520 may be performed.

In step S519, the processor 204 may maintain the service program in the form of single frequency network multicast to continuously serve the aforementioned user devices. On the other hand, in step S520, the processor 204 can wait for another preset time (which can be determined by the designer as any length of time according to requirements), and determine whether other user devices use the service program within the preset time. If yes, go to step S519, otherwise go to step S521.

In step S521, the processor 204 may obtain a specific user device served by the serving base station (each specific user device uses the above-mentioned service program), and determine whether the total number of the above-mentioned specific user devices is greater than or equal to 2, and if so, execute step S522. Otherwise, step S523 is executed.

In step S522, the processor 204 may control the serving base station to end the above-mentioned service program and start another service program in the form of single-cell mass broadcast. In addition, in step S523, the processor 204 may control the serving base station to end the service program and start another service program in the unicast format.

Through the mechanism shown in FIG. 5, the method of the present invention can adjust the resource allocation mode of the broadcast multicast service when a user device terminates the service program, so as to improve the efficiency of resource use.

In addition, in some embodiments, the present invention may also adjust the manner of configuring the service program accordingly after the user device is switched to another base station to maintain the continuity of the service program received by the user device, as detailed below.

Please refer to FIG. 6, which is a flowchart of a method for configuring a broadcast group broadcast service according to a fourth embodiment of the present invention. The method of this embodiment can be executed by the central controller 200 in FIG. 2. The details of each step in FIG. 6 are described below in conjunction with the components shown in FIG. 2.

First, in step S611, in response to determining that the first user device is handed over to the second base station, the processor 204 may determine whether the second base station has a fifth service program corresponding to the first multimedia service, if not Step S612 may be executed, and if it is, step S613 may be executed.

In step S612, the processor 204 may control the second base station to initiate a sixth service program in a unicast format, and provide the sixth service program to the first user device.

In step S613, the processor 204 may determine whether the fifth service program meets the service quality requirement of the first user device, if not, execute step S614, and if yes, execute step S615.

In step S614, the processor 204 may control the second base station to initiate a sixth service program in a unicast format, and provide the sixth service program to the first user device. That is, if the second base station does not have a service program that meets the service quality requirements of the first user device, the processor 204 may control the second base station to initiate a new sixth service program to switch to the second base station. The first user device continuously provides the first multimedia service.

On the other hand, in step S615, the processor 204 may obtain the transmission form of the fifth service program.

In one embodiment, if the transmission form of the fifth service program belongs to UNI, the processor 204 may continue to execute step S616 to control the second base station to end the fifth service program and start the corresponding to the first multimedia service The seventh service program controls the second base station to provide the seventh service program to the first user device, and sends the service parameters of the seventh service program to the first user device, wherein the transmission form of the seventh service program belongs to SCPTM. The above-mentioned service parameters of the seventh service program include, for example, time/frequency resources of control signals and data, which are used to inform the first user device which resource to receive the related information of the seventh service program after being handed over to the second base station. Data, but not limited to this.

In another embodiment, if the transmission form of the fifth service program belongs to SCPTM, the processor 204 may continue to execute step S617 to control the second base station to provide the fifth service program to the first user device. That is, when the second base station has an existing fifth service program belonging to the SCPTM, the fifth service program can be directly provided to the first user device that switched to the second base station.

In another embodiment, if the transmission form of the fifth service program belongs to MBSFN, the processor 204 may continue to execute step S618 to determine whether the first user device is within the coverage of the fifth service program, and if it is, step S619 may be executed. Otherwise, step S620 may be executed.

In step S619, the processor 204 may control the second base station to provide the fifth service program to the first user device. That is, when the first user device is still in the coverage area of the fifth service program belonging to MBSFN after being switched to the second base station, the processor 204 may directly provide the fifth service program to the second base station. The first user device of the second base station.

In addition, in step S620, the processor 204 may control the second base station to provide the fifth service program to the first user device, and send the service parameters of the fifth service program to the first user device. The service parameters of the above-mentioned fifth service program include, for example, the time/frequency resources of control signals and data, which are used to inform the first user device which resource to receive the relevant information of the fifth service program after being handed over to the second base station. Data, but not limited to this.

It can be seen from the above that through the mechanism shown in FIG. 6, the present invention can allow the first user device to continuously receive the first multimedia content after being switched to another base station due to movement.

Please refer to FIG. 7, which is a timing diagram of the handover operation signal shown in FIG. 6. In this embodiment, the signals used to switch the first user device 711 from the first base station 712 to the second base station 713 can generally refer to technical documents related to the handover operation in the prior art.

In FIG. 7, the first user device 711 performs the measurement of the reference signal. If a handover event is triggered, the first user device 711 sends a measurement report to the serving base station (ie, the first base station 712). After the station has made the decision to change hands, it will request the target base station (ie, the second base station 713) to change hands. After receiving the request, the target base station will make a first-order handover response. The content includes random access information and serves the base. After receiving this information, the station will put this information into the first-order handover command and pass it to the first user device 711. If the first user device 711 has received Multimedia Broadcast/Multicast Service (MBMS), then the serving base station will put the second-order handover notification into the first-order handover command to inform the first The user device 711 needs to receive an additional handover command, and then perform an additional MBMS handover process.

First, the serving base station can send an MBMS handover request 720 to the central controller 200, and the central controller 200 can determine the configuration modification according to the flow of FIG. 6, and transmit this modification to the target base station through the MBMS configuration modification request 722. Then the target base station determines the relevant parameters based on this message, and then transmits the overall information to the serving base station. This signaling is a second-level handover response. When receiving this signaling, the serving base station puts the relevant information into the second-level handover command Pass it to the first user device 711, and subsequently execute the action of connecting to the target base station, and the handover with multimedia service continuity is completed.

In summary, the method of the present invention allows the central controller to satisfy each user under the conditions of new service program requirements, service program end, and device handover through feedback messages from user devices and existing broadcast and group broadcast messages. The service quality of the device and reduce the use of resources.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

110, 120, 130a, 103b: base station 112,122,132: coverage 199,200: Central Controller 202: storage circuit 204: Processor 712: First Base Station 713: second base station 720: MBMS Handover Request 722: MBMS configuration modification requirements S311~S324, S411~S425, S511~S523, S611~S620: steps

Figure 1 is a schematic diagram of a conventional base station providing a service program corresponding to multimedia content to a user device. Fig. 2 is a schematic diagram of a central controller according to an embodiment of the present invention. Fig. 3 is a flowchart of a method for configuring a broadcast group broadcast service according to the first embodiment of the present invention. Fig. 4 is a flowchart of a method for configuring a broadcast group broadcast service according to a second embodiment of the present invention. Fig. 5 is a flowchart of a method for configuring a broadcast group broadcast service according to a third embodiment of the present invention. Fig. 6 is a flowchart of a method for configuring a broadcast group broadcast service according to a fourth embodiment of the present invention. FIG. 7 is a timing diagram of the hand-changing operation signal shown in FIG. 6.

S311~S324: steps

Claims (20)

A method for configuring broadcast and multicast services, suitable for a central controller, includes: In response to determining that an initial request for requesting a first multimedia service is received from a first user device, it is determined whether a first base station serving the first user device has provided a service corresponding to the first multimedia service. A first service program of service; In response to determining that the first base station has provided the first service program, determining whether the first service program meets a service quality requirement of the first user device; In response to determining that the first service program meets the service quality requirements of the first user device, obtaining a transmission form of the first service program; In response to determining that the transmission format of the first service program belongs to a unicast format, the first base station is controlled to end the first service program and start a second service program corresponding to the first multimedia service, wherein The second service program belongs to a single-cell mass broadcast form; Controlling the first base station to provide the second service program to the first user device. The method according to claim 1, wherein in response to determining that the first base station serving the first user device does not provide any service program corresponding to the first multimedia service, the method further includes: Determining whether a second base station adjacent to the first base station has provided a third service program corresponding to the first multimedia service; In response to determining that the second base station has provided the third service program, determining whether the third service program meets the service quality requirements of the first user device; In response to determining that the third service program meets the service quality requirements of the first user device, obtaining a transmission form of the third service program; In response to determining that the transmission format of the third service program belongs to the unicast format or the single-cell multicast format, the second base station is controlled to end the third service program and initiate the corresponding to the first multimedia service A fourth service program, where the fourth service program belongs to a single frequency network group broadcast form; Controlling the second base station to provide the fourth service program to the first user device. The method according to claim 2, wherein in response to determining that the transmission form of the third service program belongs to the single frequency network multicast form, the method further includes: Controlling the second base station to provide the third service program to the first user device. The method according to claim 1, wherein in response to determining that the first service program does not meet the service quality requirement of the first user device, the method further includes: Determining whether the first base station serving the first user device additionally provides a third specific service program corresponding to the first multimedia service; In response to determining that the first base station additionally provides the third specific service program corresponding to the first multimedia service, determining whether the third specific service program meets the service quality requirement of the first user device; In response to determining that the third service program meets the service quality requirements of the first user device, obtaining a transmission form of the third service program; In response to determining that the transmission format of the third service program belongs to the unicast format, the first base station is controlled to end the third service program and start a fourth service program corresponding to the first multimedia service, wherein The fourth service program belongs to the single-cell mass broadcast form; Controlling the first base station to provide the fourth service program to the first user device. The method according to claim 4, wherein in response to determining that the first base station does not additionally provide any service program corresponding to the first multimedia service, the method further includes: Determining whether a second base station adjacent to the first base station has provided the third service program corresponding to the first multimedia service; In response to determining that the second base station has provided the third service program, determining whether the third service program meets the service quality requirements of the first user device; In response to determining that the third service program meets the service quality requirements of the first user device, obtaining a transmission form of the third service program; In response to determining that the transmission format of the third service program belongs to the unicast format or the single-cell multicast format, the second base station is controlled to end the third service program and initiate the corresponding to the first multimedia service The fourth service program, wherein the fourth service program belongs to a single frequency network group broadcast form; Controlling the second base station to provide the fourth specific service program to the first user device. The method according to claim 5, wherein in response to determining that the second base station does not provide any service program corresponding to the first multimedia service, the method further includes: Start a fifth service program belonging to the unicast format, and control the first base station to provide the fifth service program to the first user device. The method according to claim 1, wherein in response to determining that the transmission form of the first service program belongs to a single-cell group broadcasting form or a single-frequency network group broadcasting form, the method further includes: Controlling the first base station to provide the first service program to the first user device. The method described in claim 1, further including: (a) Determine whether the provided multiple multimedia services are all in a first updated state; (b) In response to determining that the multimedia services are not all in the first updated state, find one belonging to a first non-updated state from the multimedia services as a reference multimedia service, wherein the reference multimedia service includes At least one reference service program; (c) Determine whether each reference service program is in a second updated state; (d) In response to determining that all the reference service programs are not in the second updated state, find one of the at least one reference service program that belongs to a second unupdated state as a pending service program; (e) In response to determining that the transmission form of the pending service program belongs to the unicast format, determining whether the pending service program can be combined with other service programs; (f) In response to determining that the pending service program cannot be combined with other service programs, mark the pending service program as the second updated state, and return to step (c); (g) In response to determining that the pending service program can be combined with other service programs, combine the pending service program with the other service program as another pending service program, and mark the other pending service program as the The second non-updated state, and return to step (c). The method according to claim 8, wherein in response to determining that the transmission form of the service program to be processed belongs to a single-cell group broadcast form or a single-frequency network group broadcast form, the method further includes: Determine whether the pending service program can be combined with other service programs; In response to determining that the service program to be processed can be combined with other service programs, the service program to be processed and the other service program are combined as another service program to be processed, and the other service program to be processed is marked as the second pending service program. Update the status and return to step (c). The method according to claim 9, wherein in response to determining that the pending service program cannot be combined with other service programs, the method further includes Determine whether the pending service program needs to be split into multiple service programs; In response to determining that the pending service program needs to be split into these service programs, split the pending service program into these service programs, mark each service program as the second unupdated state, and return to step (c ); In response to determining that the service program to be processed does not need to be split into these service programs, mark the service program to be processed as the second updated state, and return to step (c). The method according to claim 8, wherein in response to determining that each of the reference service programs is in the second updated state, the method further includes: Mark the reference multimedia service as the first updated state, and return to step (a). The method described in claim 1, further including: In response to determining that a service base station serving a second user device has received an end service request for terminating a service program from the second user device, obtain the transmission form of the service program; In response to determining that the transmission format of the service program belongs to the unicast format, the service base station that controls the second user device terminates the service program. The method according to claim 12, wherein in response to determining that the transmission form of the service program belongs to a single-cell mass broadcast form, the method further includes: In response to determining that the service program is received by multiple other user devices, maintain the service program, otherwise, wait for a preset time; In response to determining that no user device starts to receive the service program within the preset time, the base station is controlled to terminate the service program and start another service program belonging to the unicast format. The method according to claim 12, wherein in response to determining that the transmission form of the service program belongs to a single frequency network multicast form, the method further includes: Find out multiple user devices that receive the service program, and determine whether the neighboring base stations of each user device participate in providing the service program; In response to determining that any of the neighboring base stations of the user device is participating in providing the service program, the service program is maintained in the single frequency network multicast format. The method according to claim 12, wherein in response to determining that the neighboring base station of each user device does not participate in providing the service program, the method further includes: Waiting for a preset time, and determining whether other user devices use the service program within the preset time; In response to determining that other user devices use the service program within the preset time, the service program is maintained in the single frequency network group broadcast format. The method according to claim 15, wherein in response to determining that no other user device uses the service program within the preset time, the method further includes: Obtain at least one specific user device serviced by the service base station, wherein each specific user device uses the service program; In response to determining that the total number of the at least one specific user device is greater than or equal to 2, controlling the service base station to end the service program and start another service program that belongs to a single-cell mass broadcast mode; In response to determining that the total number of the at least one user device is not greater than or equal to 2, the serving base station is controlled to end the service procedure and start another service procedure belonging to a unicast format. The method described in claim 1, further including: In response to determining that the first user device is switched to a second base station, determining whether the second base station has a fifth service program corresponding to the first multimedia service; In response to determining that the second base station does not have any service program corresponding to the first multimedia service, the second base station is controlled to initiate a sixth service program belonging to the unicast format, and the sixth service The program is provided to the first user device. The method according to claim 17, wherein in response to determining that the second base station has the fifth service program corresponding to the first multimedia service, the method further includes: Determine whether the fifth service program meets the service quality requirement of the first user device; In response to determining that the fifth service program does not meet the service quality requirements of the first user device, control the second base station to initiate a sixth service program belonging to the unicast format, and provide the sixth service program to The first user device. The method according to claim 18, wherein in response to determining that the fifth service program meets the service quality requirement of the first user device, the method further includes: Obtain the transmission form of the fifth service program; In response to determining that the transmission format of the fifth service program belongs to the unicast format, control the second base station to end the fifth service program and start a seventh service program corresponding to the first multimedia service, and control The second base station provides the seventh service program to the first user device, and sends service parameters of the seventh service program to the first user device, wherein the seventh service program belongs to a single-cell mass broadcast format ； In response to determining that the transmission format of the fifth service program belongs to a single-cell mass broadcast format, controlling the second base station to provide the fifth service program to the first user device; In response to determining that the transmission format of the fifth service program belongs to a single frequency network multicast format and the first user device is not located within the coverage of the fifth service program, control the second base station to use the fifth service program Provide to the first user device, and send the service parameters of the fifth service program to the first user device; In response to determining that the transmission format of the fifth service program belongs to a single frequency network multicast format and the first user device is located within the coverage of the fifth service program, control the second base station to provide the fifth service program Give the first user device. A central controller, including: One storage circuit, storing multiple modules; A processor is coupled to the storage circuit and accesses the modules to perform the following steps: In response to determining that an initial request for requesting a first multimedia service is received from a first user device, it is determined whether a first base station serving the first user device has provided a service corresponding to the first multimedia service. A first service program of service; In response to determining that the first base station has provided the first service program, determining whether the first service program meets a service quality requirement of the first user device; In response to determining that the first service program meets the service quality requirements of the first user device, obtaining a transmission form of the first service program; In response to determining that the transmission format of the first service program belongs to a unicast format, the first base station is controlled to end the first service program and start a second service program corresponding to the first multimedia service, wherein The second service program belongs to a single-cell mass broadcast form; Controlling the first base station to provide the second service program to the first user device.

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