TWI739709B - System and method for maintaining broadcast multicast service continuity - Google Patents

Abstract

The disclosure provides a system and a method for maintaining broadcast multicast service continuity. The method includes: in a first configuration update period, requesting each base station to report multiple service continuity parameters; selecting a specific service continuity configuration from a plurality of preset service continuity configurations based on the service continuity parameters; controlling each base station in the first single frequency network to adopt the specific service continuity configuration in the second configuration update cycle subsequent to the first configuration update period.

Description

System and method for maintaining continuity of broadcast group broadcasting service

The present invention relates to a technology for maintaining service continuity, and particularly relates to a system and method for maintaining continuity of broadcast multicast service.

Audio-visual streaming services are the trend of future network applications, and network traffic will be greatly increased. Multimedia Broadcast/Multicast Service (MBMS) can effectively reduce wireless resource usage, so broadcast multicast services are the future One of the important topics of wireless networks.

Although the Third Generation Partnership Project (3GPP) has formulated a standard for broadcast multicast services in the Long Range Evolution (LTE) technology, most participating companies believe that this standard cannot meet the needs of the 5th generation (5G) communication system, so they hope that 3GPP A new radio (NR) version of the broadcast multicast service standard can be formulated in the subsequent version of the specification.

When providing broadcast multicast services, how to design a technical solution that can meet the requirements of service continuity quality while reducing the transmission volume of related control signaling is actually an important issue for those skilled in the art.

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

The invention provides a system for maintaining the continuity of broadcast group broadcasting services, which includes a central control device. The central control device manages a neighboring first single frequency network and a second single frequency network, where the first single frequency network includes multiple base stations, and each base station serves multiple user devices. The central control device is configured to: in a first configuration update period, request each base station to return a plurality of service continuity parameters, wherein the plurality of service continuity parameters include that the plurality of user devices are A first demand rate of system information signaling and a second demand rate of the plurality of user devices for system information signaling other than the first specific system information signaling, where the first specific system information signaling indicates the second A first multicast control channel of a broadcast multicast service provided by a single frequency network; and a specific service continuity configuration is selected from a plurality of preset service continuity configurations based on the plurality of service continuity parameters, and the second is required Each base station in a single frequency network adopts a specific service continuity configuration in a second configuration update period following the first configuration update period.

The present invention provides a method for maintaining the continuity of broadcast multicast services, which is suitable for a central control device, where the central control device manages a first single frequency network and a second single frequency network that are adjacent to each other, wherein the first single frequency network includes multiple Each base station serves multiple user devices. The method includes: in a first configuration update period, requesting each base station to return a plurality of service continuity parameters, wherein the plurality of service continuity parameters includes information about a first specific system information of the plurality of user devices A first demand rate of signaling and a second demand rate of the plurality of user devices for system information signaling other than the first specific system information signaling, where the first specific system information signaling indicates the second single frequency A first multicast control channel of a broadcast multicast service provided by the Internet; and based on the plurality of service continuity parameters, a specific service continuity configuration is selected from a plurality of preset service continuity configurations, and the first order is required Each base station in the frequency network adopts a specific service continuity configuration in a second configuration update period following the first configuration update period.

Please refer to FIG. 1, which is a schematic diagram of a system for maintaining continuity of broadcast multicast services according to an embodiment of the present invention. In FIG. 1, the system 100 includes a central control device 11 and a single frequency network 121-12N. In different embodiments, the central control device 11 is, for example, a multicast coordination entity (MCE) or other similar management devices/entities in the 5th generation (5G) communication system, but it may not be limited thereto. In the embodiment of the present invention, the single frequency networks 121-12N may individually include multiple base stations, and each base station may serve user devices (such as various computer devices, smart devices, etc.) located within its respective coverage areas.

For example, the base station B1 located in the single frequency network 121 can serve the user device U1 within its service range. To facilitate the description of the concept of the present invention, the base station B1 and the user device U1 will be taken as examples below, but it may not Limited to this.

In the embodiment of the present invention, the base station B1 can provide a broadcast group broadcast service (hereinafter referred to as broadcast group broadcast service A) to the user device U1, and the base station B1 can provide a specific system information block (system information block) to the user device U1. Information block (SIB) is used to inform the information related to broadcast multicast service A, such as the multicast control channel (MCCH) of broadcast multicast service A. In one embodiment, the above-mentioned specific system information block is, for example, SIB1 provided by base station B1, but it is not limited to this.

In addition, the base station B1 can also use the above-mentioned specific system information block to provide the user device U1 with information related to the adjacent single frequency network (such as the single frequency network 122) to provide broadcast multicast service A, for example, the single frequency network 122 is used to provide broadcast MCCH of Multicast Service A.

In the embodiment of the present invention, the SIB1 provided by the base station B1 may indicate a first specific system information signaling (for example, SIB15 in a 5G communication system), wherein the first specific system information signaling may indicate a single frequency network 122 provides the first MCCH of broadcast group service A. In addition, the SIB1 provided by the base station B1 can also indicate the second specific system information signaling (for example, SIB13 in the 5G communication system), where the second specific system information signaling can indicate the broadcast multicast provided by the single frequency network 121 Service A's second MCCH.

In some embodiments, the first specific system information signaling may also be referred to as a hint block (hint block, HB), and the second specific system information signaling may also be referred to as a configuration block (configuration block, CB) , But not limited to this.

Please refer to FIG. 2A, which is a schematic diagram of obtaining HB by a user device according to an embodiment of the present invention. In FIG. 2A, the user device U1 can learn the frequency and time position of the appearance of SIB1 from the Mater Information Block (MIB) provided by the base station B1, and then access the content of SIB1 accordingly. After that, the user device U1 can learn the frequency and time position of the HB 210 (and other system information signaling 211) based on the content of the SIB1, and access the content of the HB 210 accordingly, and then learn the broadcast provided by the single frequency network 122 The first MCCH 210a of Multicast Service A.

Please refer to FIG. 2B, which is a schematic diagram of obtaining a CB according to the user device shown in FIG. 2A. In FIG. 2B, the user device U1 can also learn the frequency and time position of the CB 220 based on the content of the SIB1, and then access the content of the CB 220 according to the content of the SIB1, and then learn the broadcast group broadcast service A provided by the single frequency network 121 The second MCCH 220a (and MCCH 220b, 220c for other broadcast and multicast services). In this case, the user device U1 can obtain the required broadcast multicast service A based on the second MCCH 220a.

In the embodiment of the present invention, the base station B1 may use one of the following methods to transmit HB or CB: (1) periodic; (2) on-demand; (3) hybrid.

Please refer to FIG. 3A, which is a schematic diagram of periodic transmission system information signaling according to an embodiment of the present invention. In FIG. 3A, the base station B1 can periodically transmit system information signaling (for example, HB or CB) through the instruction of the central control device 11, and the SIB1 provided by the base station B1 may indicate the system information signaling, for example The transmission cycle, but may not be limited to this.

Please refer to FIG. 3B, which is a schematic diagram of an on-demand transmission system information signaling according to an embodiment of the present invention. In FIG. 3B, the base station B1 can send system information signaling (for example, HB or CB) in an on-demand manner via the instructions of the central control device 11, and the user device U1 can, for example, be from the SIB1 provided by the base station B1 It is learned that the base station B1 transmits the system information signaling in an on-demand manner. In this case, when the user device U1 needs to access the system information signaling, it can send a request block to the base station B1, and the base station B1 can correspondingly return a response block including the above system information signaling to User device U1.

Please refer to FIG. 3C, which is a schematic diagram of the information signaling of the hybrid transmission system shown in FIGS. 3A and 3B. In Figure 3C, the base station B1 can be instructed by the central control device 11 to transmit system information signaling (for example, HB or CB) in a hybrid manner (ie, a combination of periodic and on-demand), and the user device U1, for example, can learn from the SIB1 provided by the base station B1 that the base station B1 transmits the system information signaling in a hybrid manner. In this case, the user device U1 can obtain the system information signaling by listening to the system information signaling periodically transmitted by the base station B1, or by sending a request block to the base station B1 when required To obtain the system information signaling returned by the base station B1, but it is not limited to this.

In the embodiment of the present invention, the base station B1 can use the following methods to provide HB and CB respectively: (1) Periodic HB + Periodic CB; (2) On-demand HB + Periodic CB; (3) Periodic HB + hybrid Type CB; (4) On-demand HB + hybrid CB.

That is, in the method (1), the base station B1 can periodically provide HB and periodically provide CB. In the method (2), the base station B1 can provide HB on demand and CB periodically. In the method (3), the base station B1 can periodically provide HB and hybridly provide CB. In the method (4), the base station B1 can provide HB on demand and CB in a mixed manner. In the embodiment of the present invention, the above four methods can be collectively referred to as the preset service continuity configuration of the present invention, and the methods (1) to (4) can be referred to as the first to fourth service continuity configurations, respectively.

In the embodiment of the present invention, the time can be divided into a plurality of configuration update periods, and in a certain configuration update period (hereinafter referred to as the first configuration update period), the central control device 11 can respond based on the base station in the single frequency network 121 The information transmitted to determine the single frequency network 121 in the next configuration update cycle (hereinafter referred to as the second configuration update cycle), which of the above-mentioned preset service continuity configurations should be used to provide HB and CB, will be further explained below.

Please refer to FIG. 4, which is a flowchart of a method for maintaining the continuity of broadcast multicast services according to an embodiment of the present invention. The method of this embodiment can be executed by the central control device 11 in FIG. 1. The details of each step in FIG. 4 will be described below with the components shown in FIG.

表示）及這些用戶裝置對於第一特定系統資訊信令以外的其他系統資訊信令（包括第二特定系統資訊信令（即CB））的第二需求率（以

表示） First, in step S410, the central control device 11 may request each base station in the single frequency network 121 to return multiple service continuity parameters in the first configuration update period. In an embodiment, the above-mentioned service continuity parameter may include the user equipment (such as user equipment U1) served by each base station (such as base station B1) in the single frequency network 121 for the first specific system information signaling (ie HB) First demand rate (in

Indicates) and the second demand rate of these user devices for system information signaling other than the first specific system information signaling (including the second specific system information signaling (ie CB))

Express)

After that, in step S420, the central control device 11 may select a specific service continuity configuration from the preset service continuity configurations based on the service continuity parameters.

）是否大於第一門限值（以

表示）。反應於判定第一需求率大於第一門限值，中央控制裝置11可接著在步驟S512中判斷所述第一需求率（

）是否亦大於第二門限值（以

表示）。反應於判定所述第一需求率（

）亦大於第二門限值（

），則中央控制裝置11可選擇第一服務連續性配置（即，「週期式HB+週期式CB」）作為所述特定服務連續性配置，反之則可選擇第三服務連續性配置（即，「週期式HB+混合式CB」）作為所述特定服務連續性配置。 Please refer to FIG. 5A, which is a schematic diagram of selecting a specific service continuity configuration according to an embodiment of the present invention. In step S511, the central control device 11 may determine the first demand rate (

) Is greater than the first threshold (to

Express). In response to determining that the first demand rate is greater than the first threshold value, the central control device 11 may then determine the first demand rate in step S512 (

) Is also greater than the second threshold (to

Express). Reflect to determine the first demand rate (

) Is also greater than the second threshold (

), the central control device 11 can select the first service continuity configuration (ie, "periodical HB + periodic CB") as the specific service continuity configuration, and vice versa, it can select the third service continuity configuration (ie, " Periodic HB + Hybrid CB") as the specific service continuity configuration.

）是否大於第三門限值（以

表示）。反應於判定述第二需求率（

）未大於第三門限值（

），則中央控制裝置11可選擇第二服務連續性配置（即，「按需式HB+週期式CB」）作為所述特定服務連續性配置，反之則可選擇第四服務連續性配置（即，「按需式HB+混合式CB」）作為所述特定服務連續性配置。 On the other hand, in response to determining that the first demand rate is not greater than the first threshold value, the central control device 11 may then determine the second demand rate in step S513 (

) Is greater than the third threshold (to

Express). Reflect to determine the second demand rate (

) Is not greater than the third threshold (

), the central control device 11 can select the second service continuity configuration (ie, "on-demand HB + periodic CB") as the specific service continuity configuration, otherwise, it can select the fourth service continuity configuration (ie, "On-demand HB + hybrid CB") as the specific service continuity configuration.

）、第二門限值（

）及第三門限值（

）。例如，設計者可先模擬第一至第四服務連續性配置在不同

及

下所相應產生的控制信令數量，並進而找出在某個特定的

及

下產生最少控制信令數量的服務連續性配置。 In different embodiments, the designer can determine the above-mentioned first threshold value (

), the second threshold (

) And the third threshold (

). For example, the designer can first simulate the first to fourth service continuity configuration in different

and

Control the number of control signaling generated accordingly, and then find out in a particular

and

Under the service continuity configuration that generates the least amount of control signaling.

及

下產生最少控制信令數量的服務連續性配置的示意圖。基於圖5B中第一至第四服務連續性配置的分布情形，設計者例如可以符號「*」（對應於第四服務連續性配置）與符號「x」（對應於第二服務連續性配置）的交界處對應的

作為

。另外，設計者例如可以符號「x」與符號「□」（對應於第三服務連續性配置）的交界處對應的

作為

，以及以符號「□」與符號「○」（對應於第一服務連續性配置）的交界處對應的

作為

，但可不限於此。 Please refer to Figure 5B, which is shown in Figure 5A in different

and

Below is a schematic diagram of a service continuity configuration that generates the least amount of control signaling. Based on the distribution of the first to fourth service continuity configurations in FIG. 5B, the designer can, for example, symbol "*" (corresponding to the fourth service continuity configuration) and symbol "x" (corresponding to the second service continuity configuration) Corresponding to the junction of

As

. In addition, the designer can, for example, correspond to the junction of the symbol "x" and the symbol "□" (corresponding to the third service continuity configuration)

As

, And corresponding to the junction of the symbol "□" and the symbol "○" (corresponding to the first service continuity configuration)

As

, But not limited to this.

After that, in step S430, the central control device 11 may request each base station (for example, base station B1) in the single frequency network 121 to adopt the above-mentioned specific service continuity configuration in a second configuration update period following the first configuration update period.

It can be seen from the above that the central control device of the present invention can adjust the way the single frequency network provides HB and CB based on the service continuity parameters provided by the base station, thereby achieving the purpose of reducing the amount of system control information and meeting the service quality requirements.

In an embodiment, assuming that the user device U1 moves from the base station B1 to the coverage area of the base station B2 of the single frequency network 122, in order to maintain the continuity of the user device U1 receiving the broadcast multicast service A, the user device U1 can rely on The above-mentioned specific service continuity configuration attempts to obtain the first specific system information signaling (HB) from the base station B1.

In one embodiment, in response to the determination that the first specific system information signal (HB) is successfully obtained before the handover to the base station B2, the user device U1 can use the first specific system information signal after the handover to the base station B2. The first MCCH indicated in the command continues to obtain broadcast multicast service A.

On the other hand, in response to the determination that the first specific system information signaling (HB) has not been successfully obtained before the handover to the base station B2, after the handover to the base station B2, the user device U1 can provide the information from the base station B2 The SIB1 obtains another specific service continuity configuration corresponding to the single frequency network 121. After that, the user device U1 can obtain the third specific system information signaling according to the another specific service continuity configuration, where the third specific system information signaling can indicate the first broadcast multicast service A provided by the single frequency network 122 MCCH. In an embodiment, the third specific system information signaling can be understood as the CB provided by the base station B2, but it is not limited to this. Then, the user device U1 can continuously obtain the required broadcast multicast service A according to the third specific system information signaling, but it is not limited to this.

In response to different specific service continuity configurations, the user device U1 can obtain the first specific system information signaling (HB) provided by the base station B1 and the third specific system information signaling (CB) provided by the base station B2. Corresponding changes, the following will be supplemented by the first to fourth embodiments for further description.

In the first embodiment, assuming that the central control device 11 selects the first service continuity configuration as the specific service continuity configuration, each base station (for example, base station B1) in the single frequency network 121 can respond to the specific service continuity configuration. The service continuity configuration provides first specific system information signaling according to the first cycle (which can be determined by the central control device 11), and provides second specific system information signaling according to the second cycle (which can be determined by the central control device 11).

In addition, assuming that the central control device 11 selects the first or second service continuity configuration as the other specific service continuity configuration, each base station (for example, base station B2) in the single frequency network 122 will be required to be periodic accordingly. Send the third specific system information signaling locally.

Please refer to FIG. 6A and FIG. 6B, which are schematic diagrams of maintaining service continuity according to the first embodiment of the present invention. In FIG. 6A, it is assumed that the user device U1 determines that a service continuity event has occurred when receiving the broadcast multicast service A (for example, the base station B1 will be handed over to the base station B2). In this case, the user device U1 may try to obtain the first specific system information signaling (HB) indicating the first MCCH from the base station B1. Since the base station B1 transmits the HB periodically, the user device U1 can listen to the HB according to the time and frequency position indicated by the SIB1 of the base station B1.

If the user device U1 successfully listens to the HB transmitted by the base station B1, it can obtain the first MCCH accordingly, and then continue to obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH after switching to the base station B2.

Please refer to Figure 6B. If user device U1 fails to hear the HB transmitted by base station B1 before handing over to base station B2, then after handing over to base station B2, user device U1 can be based on SIB1 provided by base station B2 It is learned that the base station B2 periodically provides the third specific system information signaling (ie, the CB provided by the base station B2). In this case, the user device U1 can listen to the third specific system information signaling (ie, the CB provided by the base station B2) according to the time and frequency position indicated by the SIB1 of the base station B2 to obtain the first MCCH. After that, the user device U1 can obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH, but it is not limited to this.

In the second embodiment, assuming that the central control device 11 selects the second service continuity configuration as the specific service continuity configuration, each base station (for example, base station B1) in the single frequency network 121 can respond to the specific service continuity configuration. The service continuity configuration provides the first specific system information signaling according to the needs of each user device (such as the user device U1) in the single frequency network 121, and provides the second specific system information signaling according to the second cycle (which can be determined by the central control device 11) System information signaling.

In addition, assuming that the central control device 11 selects the first or second service continuity configuration as the other specific service continuity configuration, each base station (for example, base station B2) in the single frequency network 122 will be required to be periodic accordingly. Send the third specific system information signaling locally.

Please refer to FIG. 7A and FIG. 7B, which are schematic diagrams of maintaining service continuity according to the second embodiment of the present invention. In FIG. 7A, it is assumed that the user device U1 determines that a service continuity event has occurred when receiving the broadcast multicast service A (for example, the base station B1 will be handed over to the base station B2). In this case, the user device U1 may try to obtain the first specific system information signaling (HB) indicating the first MCCH from the base station B1. Since the base station B1 provides HB on demand, the user device U1 can send a request block for requesting HB to the base station B1. Correspondingly, the base station B1 can return a response block indicating HB.

If the user device U1 successfully listens to the response block sent by the base station B1, it can obtain the first MCCH accordingly, and then continue to obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH after switching to the base station B2 .

Referring to Figure 7B, if the user device U1 fails to hear the response block sent by the base station B1 before handing over to the base station B2, after handing over to the base station B2, the user device U1 can be provided based on the base station B2 The SIB1 learns that the base station B2 periodically provides the third specific system information signaling (ie, the CB provided by the base station B2). In this case, the user device U1 can listen to the third specific system information signaling (ie, the CB provided by the base station B2) according to the time and frequency position indicated by the SIB1 of the base station B2 to obtain the first MCCH. After that, the user device U1 can obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH, but it is not limited to this.

In the third embodiment, assuming that the central control device 11 selects the third service continuity configuration as the specific service continuity configuration, each base station (for example, base station B1) in the single frequency network 121 can respond to the specific service continuity configuration. The service continuity configuration is based on the needs of each user device (such as the user device U1) in the single frequency network 121 and provides the first specific system information signaling according to the first cycle (which can be determined by the central control device 11), and according to the second cycle ( It can be determined by the central control device 11 to provide the second specific system information signaling, and provide the second specific system information signaling according to the needs of each user device.

In addition, assuming that the central control device 11 selects the third or fourth service continuity configuration as the other specific service continuity configuration, each base station (for example, base station B2) in the single frequency network 122 will be required to be mixed accordingly. Send the third specific system information signaling.

Please refer to FIG. 8A and FIG. 8B, which are schematic diagrams of maintaining service continuity according to the third embodiment of the present invention. In FIG. 8A, it is assumed that the user device U1 determines that a service continuity event has occurred when receiving the broadcast multicast service A (for example, the base station B1 will be handed over to the base station B2). In this case, the user device U1 may try to obtain the first specific system information signaling (HB) indicating the first MCCH from the base station B1. Since the base station B1 transmits the HB periodically, the user device U1 can listen to the HB according to the time and frequency position indicated by the SIB1 of the base station B1.

If the user device U1 successfully listens to the HB transmitted by the base station B1, it can obtain the first MCCH accordingly, and then continue to obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH after switching to the base station B2.

Please refer to Figure 8B. If user device U1 fails to hear the HB transmitted by base station B1 before handing over to base station B2, after handing over to base station B2, user device U1 can be based on SIB1 provided by base station B2 It is learned that the base station B2 provides the third specific system information signaling (ie, the CB provided by the base station B2) in a mixed manner.

After that, in case 1, the user device U1 can send a request block for requesting the CB to the base station B2. Correspondingly, the base station B2 can return a response block indicating CB. If the user device U1 successfully listens to the response block sent by the base station B2, it can obtain the first MCCH accordingly, and then continue to obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH after switching to the base station B2 .

In addition, in case 2, the user device U1 can also listen to the third specific system information signaling (ie, the CB provided by the base station B2) according to the time and frequency position indicated by the SIB1 of the base station B2 to obtain the first MCCH. After that, the user device U1 can obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH, but it is not limited to this.

In the fourth embodiment, assuming that the central control device 11 selects the fourth service continuity configuration as the specific service continuity configuration, each base station (for example, base station B1) in the single frequency network 121 can respond to the specific service continuity configuration. The service continuity configuration is based on the needs of each user device (such as the user device U1) in the single frequency network 121 and provides the second specific system information signaling according to the second cycle (which can be determined by the central control device 11), and according to each user device The first specific system information signaling and the second specific signaling are provided according to the demand.

In addition, assuming that the central control device 11 selects the third or fourth service continuity configuration as the other specific service continuity configuration, each base station (for example, base station B2) in the single frequency network 122 will be required to be mixed accordingly. Send the third specific system information signaling.

Please refer to FIG. 9A and FIG. 9B, which are schematic diagrams of maintaining service continuity according to the fourth embodiment of the present invention. In FIG. 9A, it is assumed that the user device U1 determines that a service continuity event has occurred when receiving the broadcast multicast service A (for example, the base station B1 will be handed over to the base station B2). In this case, the user device U1 may try to obtain the first specific system information signaling (HB) indicating the first MCCH from the base station B1. Since the base station B1 provides HB on demand, the user device U1 can send a request block for requesting HB to the base station B1. Correspondingly, the base station B1 can return a response block indicating HB.

If the user device U1 successfully listens to the response block sent by the base station B1, it can obtain the first MCCH accordingly, and then continue to obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH after switching to the base station B2 .

Please refer to Figure 9B. If the user device U1 fails to hear the response block sent by the base station B1 before switching to the base station B2, after the user device U1 is switched to the base station B2, the user device U1 can be provided based on the base station B2 The SIB1 learns that the base station B2 provides the third specific system information signaling (ie, the CB provided by the base station B2) in a mixed manner.

After that, in case 1, the user device U1 can send a request block for requesting the CB to the base station B2. Correspondingly, the base station B2 can return a response block indicating CB. If the user device U1 successfully listens to the response block sent by the base station B2, it can obtain the first MCCH accordingly, and then continue to obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH after switching to the base station B2 .

In addition, in case 2, the user device U1 can also listen to the third specific system information signaling (ie, the CB provided by the base station B2) according to the time and frequency position indicated by the SIB1 of the base station B2 to obtain the first MCCH. After that, the user device U1 can obtain the broadcast multicast service A provided by the base station B2 based on the first MCCH, but it is not limited to this.

In summary, the central control device of the present invention can adjust the way the single frequency network provides HB and CB based on the service continuity parameters provided by the base station, thereby achieving the purpose of reducing the amount of system control information and meeting the service quality requirements.

Moreover, when the user device moves from a first single frequency network and changes hands to a second single frequency network, it can try to obtain HB based on the specific service continuity configuration corresponding to the first single frequency network (which indicates the second single frequency network). Provide MCCH for broadcast group broadcasting service). If the user device can successfully obtain the HB, it can continue to receive the required broadcast multicast service after switching to the second single frequency network. On the other hand, if the user device cannot obtain the HB before handing over to the second single frequency network, it can obtain the second order based on the specific service continuity configuration corresponding to the second single frequency network after handing over to the second single frequency network. CB of the frequency network (it indicates the MCCH of the second single frequency network to provide broadcast multicast services). In this way, the user device can successfully complete the handover operation and ensure the communication continuity of the handover process, thereby achieving the effect of maintaining the service quality. In addition, the present invention may also reduce the control signaling required for handover, thereby shortening the handover time of control signaling required for handover, so as to improve transmission efficiency.

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 protection scope of the present invention shall be subject to those defined by the attached patent application scope.

100: System 11: Central control device 121~12N: Single frequency network U1: User device B1, B2: base station 210:HB 210a: First MCCH 211: Other system information signaling 220: CB 220a: second MCCH 220b, 220c: MCCH A: Broadcast group broadcasting service S410~S430, S511~S513: steps

及

下產生最少控制信令數量的服務連續性配置的示意圖。 圖6A及圖6B是依據本發明第一實施例繪示的維持服務連續性的示意圖。 圖7A及圖7B是依據本發明第二實施例繪示的維持服務連續性的示意圖。 圖8A及圖8B是依據本發明第三實施例繪示的維持服務連續性的示意圖。 圖9A及圖9B是依據本發明第四實施例繪示的維持服務連續性的示意圖。 FIG. 1 is a schematic diagram of a system for maintaining continuity of broadcast multicast services according to an embodiment of the present invention. FIG. 2A is a schematic diagram of obtaining HB by a user device according to an embodiment of the present invention. FIG. 2B is a schematic diagram of obtaining a CB according to the user device shown in FIG. 2A. FIG. 3A is a schematic diagram of periodic transmission system information signaling according to an embodiment of the present invention. FIG. 3B is a schematic diagram of an on-demand transmission system information signaling according to an embodiment of the present invention. FIG. 3C is a schematic diagram of the information signaling of the hybrid transmission system shown in FIG. 3A and FIG. 3B. Fig. 4 is a flowchart of a method for maintaining continuity of broadcast multicast services according to an embodiment of the present invention. FIG. 5A is a schematic diagram of selecting a specific service continuity configuration according to an embodiment of the present invention. Figure 5B is based on the diagram shown in Figure 5A.

and

Below is a schematic diagram of a service continuity configuration that generates the least amount of control signaling. 6A and 6B are schematic diagrams of maintaining service continuity according to the first embodiment of the present invention. 7A and 7B are schematic diagrams of maintaining service continuity according to the second embodiment of the present invention. 8A and 8B are schematic diagrams of maintaining service continuity according to the third embodiment of the present invention. 9A and 9B are schematic diagrams of maintaining service continuity according to the fourth embodiment of the present invention.

S410~S430: steps

Claims (14)

A system for maintaining the continuity of broadcast and multicast services, including: A central control device that manages a first single frequency network and a second single frequency network that are adjacent to each other, wherein the first single frequency network includes a plurality of base stations, and each of the base stations serves a plurality of user devices, wherein the central control The device is configured to: In a first configuration update period, each base station is required to return a plurality of service continuity parameters, where the service continuity parameters include a first demand rate of the user equipment for a first specific system information signaling And a second demand rate of the user devices for other system information signaling other than the first specific system information signaling, wherein the first specific system information signaling indicates a broadcast multicast provided by the second single frequency network A first multicast control channel of the service; and Selecting a specific service continuity configuration from a plurality of preset service continuity configurations based on the service continuity parameters; and Each base station in the first single frequency network is required to adopt the specific service continuity configuration in a second configuration update period following the first configuration update period. The system according to claim 1, wherein the first specific system information signaling and the other system information signaling are provided by the first base station, and the other system information signaling includes a second specific system information signaling Command, the second specific system information signaling indicates a second multicast control channel of the broadcast multicast service provided by the first single frequency network. The system according to claim 2, wherein the preset service continuity configurations include a first service continuity configuration, and the specific service continuity configuration is the first service continuity configuration, and the first single frequency Each base station in the network provides the first specific system information signaling according to a first cycle according to the specific service continuity configuration, and provides the second specific system information signaling according to a second cycle. The system according to claim 3, wherein the step of selecting the specific service continuity configuration from the preset service continuity configurations based on the service continuity parameters includes: In response to determining that the first demand rate is greater than a first threshold value, and the first demand rate is greater than a second threshold value, the first service continuity configuration is selected as the specific service continuity configuration. The system according to claim 2, wherein the preset service continuity configurations include a second service continuity configuration, and the specific service continuity configuration is the second service continuity configuration, and the first single frequency Each base station in the network provides the first specific system information signaling according to the requirements of each user device in response to the specific service continuity configuration, and provides the second specific system information signaling according to a second cycle. The system according to claim 5, wherein the step of selecting the specific service continuity configuration from the preset service continuity configurations based on the service continuity parameters includes: In response to determining that the first demand rate is not greater than a first threshold value, and the second demand rate is not greater than a third threshold value, the second service continuity configuration is selected as the specific service continuity configuration. The system according to claim 2, wherein the preset service continuity configurations include a third service continuity configuration, and the specific service continuity configuration is the third service continuity configuration, and the first single frequency Each base station in the network periodically transmits the first specific system information signaling and the second specific system information signaling in response to the specific service continuity configuration, and provides the second specific system information signaling according to the needs of each user device 2. Specific system information signaling. The system according to claim 7, wherein the step of selecting the specific service continuity configuration from the preset service continuity configurations based on the service continuity parameters includes: In response to determining that the first demand rate is greater than a first threshold but less than a second threshold, the third service continuity configuration is selected as the specific service continuity configuration. The system according to claim 2, wherein the preset service continuity configurations include a fourth service continuity configuration, and the specific service continuity configuration is the fourth service continuity configuration, and the first single frequency Each base station in the network periodically provides the second specific system information signaling in response to the specific service continuity configuration, and provides the first specific system information signaling and the second specific system information signaling according to the needs of each user device 2. Specific signaling. The system according to claim 9, wherein the step of selecting the specific service continuity configuration from the preset service continuity configurations based on the service continuity parameters includes: In response to determining that the first demand rate is not greater than a first threshold value, and the second demand rate is greater than a third threshold value, the fourth service continuity configuration is selected as the specific service continuity configuration. The system according to claim 1, further comprising a first user device, which is served by a first base station among the base stations, wherein the first user device passes through the first base station in the second configuration update period A specific system information block provided by the station obtains the specific service continuity configuration. The system of claim 11, wherein the first user device is configured to: In response to the determination that it is necessary to switch hands from the first base station to a second base station belonging to the second single frequency network, it attempts to obtain the first specific system information signaling from the first base station according to the specific service continuity configuration ； In response to the determination that the first specific system information signaling is successfully obtained before the handover to the second base station, the broadcast multicast service is continuously obtained according to the first specific system information signaling after the handover to the second base station . The system according to claim 12, wherein the first user device is further configured to: In response to the determination that the first specific system information signaling cannot be successfully obtained before the handover to the second base station, after the handover to the second base station, the second base station corresponding to the second order is obtained from the second base station. Another specific service continuity configuration of the frequency network; Obtain a third specific system information signaling according to the another specific service continuity configuration, wherein the third specific system information signaling indicates the first multicast control of the broadcast multicast service provided by the second single frequency network aisle; The broadcast multicast service is continuously obtained according to the third specific system information signaling. A method for maintaining the continuity of broadcast multicast services is suitable for a central control device, wherein the central control device manages a first single frequency network and a second single frequency network adjacent to each other, wherein the first single frequency network includes a plurality of A base station, each of which serves multiple user devices, the method includes: In a first configuration update period, each base station is required to return a plurality of service continuity parameters, where the service continuity parameters include a first demand rate of the user equipment for a first specific system information signaling And a second demand rate of the user devices for other system information signaling other than the first specific system information signaling, wherein the first specific system information signaling indicates a broadcast multicast provided by the second single frequency network A first multicast control channel of the service; and Selecting a specific service continuity configuration from a plurality of preset service continuity configurations based on the service continuity parameters; and Each base station in the first single frequency network is required to adopt the specific service continuity configuration in a second configuration update period following the first configuration update period.

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