TW202231085A - 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 multicast service

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

The video streaming service is the trend of future network applications, and the network traffic will be greatly increased, and the Multimedia Broadcast/Multicast Service (MBMS) can effectively reduce the use of wireless resources, so the broadcast and multicast service is the future. One of the important issues of wireless network.

Although the 3rd Generation Partnership Project (3GPP) has developed 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 developed in subsequent specification editions.

When providing a broadcast multicast service, how to design a technical solution that can meet the demand for service continuity quality and reduce the transmission amount of related control signaling is an important issue for those skilled in the art.

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

The present invention provides a system for maintaining continuity of broadcast and multicast services, including a central control device. The central control device manages an adjacent first single frequency network and a second single frequency network, wherein the first single frequency network includes a plurality of base stations, and each base station serves a plurality of user equipments. The central control device is configured to: in a first configuration update period, require each base station to return a plurality of service continuity parameters, wherein the plurality of service continuity parameters include the plurality of user equipments for a first specific a first demand rate of system information signaling and a second demand rate of the plurality of user equipments for system information signaling other than the first specific system information signaling, wherein 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 selecting a specific service continuity configuration from a plurality of preset service continuity configurations based on the plurality of service continuity parameters, and requiring the first Each base station in a single frequency network adopts a specific service continuity configuration in a second configuration update period subsequent to the first configuration update period.

The present invention provides a method for maintaining continuity of broadcast multicast services, suitable for a central control device, wherein the central control device manages a first SFN and a second SFN adjacent to it, wherein the first SFN 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 include information about a first specific system of the plurality of user equipments a first demand rate of signaling and a second demand rate of the plurality of user equipments for system information signaling other than the first specific system information signaling, wherein the first specific system information signaling indicates the second single frequency a first multicast control channel of a broadcast multicast service provided by the network; and select a specific service continuity configuration from a plurality of preset service continuity configurations based on the plurality of service continuity parameters, and request the first single Each base station in the frequency network adopts a specific service continuity configuration in a second configuration update period subsequent to 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 single frequency networks 121 to 12N. In different embodiments, the central control device 11 is, for example, a multicast coordination entity (multicast coordination entity, MCE) in a fifth generation (5G) communication system or other similar management devices/entities, but it is not limited thereto. In the embodiment of the present invention, each of the single frequency networks 121-12N may include a plurality of base stations, and each base station may serve user devices (such as various computer devices, smart devices, etc.) located within its respective coverage.

For example, the base station B1 located in the single frequency network 121 can serve the user equipment U1 located within its service range, and for the convenience of explaining the concept of the present invention, the base station B1 and the user equipment U1 will be used as examples below, but they may not be limited to this.

In the embodiment of the present invention, the base station B1 can provide a broadcast multicast service (hereinafter referred to as the broadcast multicast 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) to notify the information related to the broadcast multicast service A, such as the multicast control channel (multicast control channel, MCCH) of the broadcast multicast service A, and so on. In one embodiment, the above-mentioned specific system information block is, for example, SIB1 provided by the base station B1, but it is not limited thereto.

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 broadcast multicast service A provided by the adjacent SFN (such as the SFN 122 ), for example, the SFN 122 is used for providing broadcast services. Multicast service A's MCCH.

In the embodiment of the present invention, the SIB1 provided by the base station B1 may indicate a first specific system information signaling (eg 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 the broadcast multicast service A. In addition, the SIB1 provided by the base station B1 can also indicate the second specific system information signaling (eg SIB13 in the 5G communication system), wherein the second specific system information signaling can indicate the broadcast multicast provided by the SFN 121 Serving 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 equipment according to an embodiment of the present invention. In FIG. 2A , the user device U1 can learn the frequency and time position of the SIB1 from the main information block (Mater Information Block, MIB) provided by the base station B1 , and then access the content of the 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 SFN 122 Multicast service A's first MCCH 210a.

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 know 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 accordingly, and then know the broadcast multicast service A provided by the SFN 121. A second MCCH 220a (and other MCCHs 220b, 220c for broadcast multicast services). In this case, the user equipment U1 can obtain the required broadcast multicast service A based on the second MCCH 220a.

In an embodiment of the present invention, the base station B1 can transmit HB or CB in one of the following ways: (1) periodic; (2) on-demand; (3) hybrid.

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

Please refer to FIG. 3B , which is a schematic diagram of on-demand transmission of system information signaling according to an embodiment of the present invention. In FIG. 3B , the base station B1 can transmit system information signaling (such as HB or CB) in an on-demand manner through the instruction of the central control device 11 , and the user device U1 can, for example, obtain 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 equipment 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 system information signaling to User device U1.

Please refer to FIG. 3C , which is a schematic diagram of the HTS information signaling according to FIG. 3A and FIG. 3B . In FIG. 3C , the base station B1 can transmit the system information signaling (eg, HB or CB) in a hybrid (ie, a combination of periodic and on-demand) mode through the instruction of the central control device 11 , while the user equipment For example, U1 can know 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 equipment 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 there is a need to obtain the system information signaling returned by the base station B1, but not limited to this.

In the embodiment of the present invention, the base station B1 can provide HB and CB in the following ways: (1) Periodic HB+periodic CB; (2) On-demand HB+periodic CB; (3) Periodic HB+ Hybrid (4) On-demand HB + hybrid CB.

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

In the embodiment of the present invention, time can be divided into multiple configuration update cycles, and in a certain configuration update cycle (hereinafter referred to as the first configuration update cycle), the central control device 11 The transmitted information is used to determine which of the above-mentioned preset service continuity configurations should be used by the SFN 121 to provide HB and CB in the next configuration update cycle (hereinafter referred to as the second configuration update cycle), which will be further described below.

Please refer to FIG. 4 , which is a flowchart of a method for maintaining continuity of a broadcast multicast service 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 , and the details of each step in FIG. 4 will be described below in conjunction with the components shown in FIG. 1 .

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 a plurality of service continuity parameters in the first configuration update cycle. In an embodiment, the above-mentioned service continuity parameter may include the first specific system information signaling (ie, HB) of the user equipment (eg, user equipment U1) served by each base station (eg, base station B1 ) in the SFN 121 . The first demand rate of (in

representation) and the second demand rate (in

express)

Afterwards, 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 value (with

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 (

) is also greater than the second threshold value (with

express). In response to determining the first demand rate (

) is also greater than the second threshold (

), the central control device 11 can select the first service continuity configuration (ie, "periodic HB+periodic CB") as the specific service continuity configuration, otherwise, it can select the third service continuity configuration (ie, "periodic HB+periodic CB") 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 (

) is greater than the third threshold value (with

express). In response to determining the second demand rate (

) is not greater than the third threshold value (

), then 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 value (

) and the third threshold (

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

and

The corresponding number of control signaling generated under the

and

A 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 FIG. 5B , which is shown in FIG. 5A in different

and

A schematic diagram of a service continuity configuration that produces the least amount of control signaling below. Based on the distribution of the first to fourth service continuity configurations in FIG. 5B , the designer can, for example, use the symbol “*” (corresponding to the fourth service continuity configuration) and the 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 intersection of the symbol "x" and the symbol "□" (corresponding to the third service continuity configuration).

as

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

as

, but not limited to this.

Afterwards, in step S430, the central control device 11 may request each base station (eg, base station B1) in the SFN 121 to adopt the above-mentioned specific service continuity configuration in the second configuration update period subsequent to the first configuration update period.

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

In one embodiment, assuming that the user device U1 moves from the base station B1 to the coverage of the base station B2 of the SFN 122, in order to maintain the continuity of the user device U1 receiving the broadcast multicast service A, the user device U1 can 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 determining that the first specific system information signaling (HB) is successfully obtained before the handover to the base station B2, the user equipment U1 may use the first specific system information signaling after the handover to the base station B2. Let the first MCCH indicated in the command continue to obtain the broadcast multicast service A.

On the other hand, in response to determining that the first specific system information signaling (HB) cannot be successfully obtained before handover to the base station B2, after the handover to the base station B2, the user equipment U1 can provide the information from the base station B2. SIB1 obtains another specific service continuity configuration corresponding to SFN 121 . After that, the user equipment U1 can obtain the third specific system information signaling according to the another specific service continuity configuration, wherein the third specific system information signaling can indicate the first broadcast multicast service A provided by the SFN 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 equipment 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 manner in which the user equipment U1 obtains 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 can be determined. Correspondingly changed, the following will be supplemented with 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 (eg, 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 first cycle (which can be determined by the central control device 11 ), and the 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, then each base station (eg base station B2) in the single frequency network 122 will be required to periodically to send the third specific system information signaling.

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 equipment U1 determines that a service continuity event occurs when receiving the broadcast multicast service A (eg, the handover from the base station B1 to the base station B2 ). In this case, the user equipment U1 may attempt to obtain the first specific system information signaling (HB) indicating the first MCCH from the base station B1. Since the base station B1 transmits HB periodically, the user equipment U1 can listen to the HB accordingly according to the time and frequency position indicated by the SIB1 of the base station B1.

If the user equipment U1 successfully hears 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 handover to the base station B2.

Referring to FIG. 6B , if the user equipment U1 fails to successfully hear the HB transmitted by the base station B1 before handing over to the base station B2, after the handover to the base station B2, the user equipment U1 can use the SIB1 provided by the base station B2 It is known 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 equipment 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 equipment 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 (eg, 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 (eg, the user device U1) in the single frequency network 121, and provides the second specific system information 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, then each base station (eg base station B2) in the single frequency network 122 will be required to periodically to send the third specific system information signaling.

Please refer to FIG. 7A and FIG. 7B , which are schematic diagrams of maintaining service continuity according to a second embodiment of the present invention. In FIG. 7A , it is assumed that the user equipment U1 determines that a service continuity event occurs when receiving the broadcast multicast service A (eg, the handover from the base station B1 to the base station B2 ). In this case, the user equipment U1 may attempt 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 request the HB by sending the request block to the base station B1. Correspondingly, the base station B1 can return a response block indicating HB.

If the user equipment U1 successfully hears 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 handover to the base station B2. .

Referring to FIG. 7B , if the user equipment U1 fails to successfully hear the response block transmitted by the base station B1 before handing over to the base station B2, after the handover to the base station B2, the user equipment U1 can provide the base station B2 The SIB1 knows 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 equipment 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 equipment 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 (eg, 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 first cycle (which can be determined by the central control device 11 ) according to the needs of each user device (such as the user device U1 ) in the single frequency network 121 , 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 requirements of each user device.

In addition, if the central control device 11 selects the third or fourth service continuity configuration as the other specific service continuity configuration, each base station (eg base station B2) in the single frequency network 122 will be required to mix and match 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 a third embodiment of the present invention. In FIG. 8A , it is assumed that the user equipment U1 determines that a service continuity event occurs when receiving the broadcast multicast service A (eg, the handover from the base station B1 to the base station B2 ). In this case, the user equipment U1 may attempt to obtain the first specific system information signaling (HB) indicating the first MCCH from the base station B1. Since the base station B1 transmits HB periodically, the user equipment U1 can listen to the HB accordingly according to the time and frequency position indicated by the SIB1 of the base station B1.

If the user equipment U1 successfully hears 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 handover to the base station B2.

Referring to FIG. 8B , if the user equipment U1 fails to successfully hear the HB transmitted by the base station B1 before handing over to the base station B2, after the handover to the base station B2, the user equipment U1 can be based on the SIB1 provided by the base station B2 It is known 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.

Afterwards, in case 1, the user equipment U1 may send a request block for requesting a CB to the base station B2. Correspondingly, the base station B2 can return the response block indicating the CB. If the user equipment U1 successfully hears 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 handover to the base station B2. .

In addition, in case 2, the user equipment 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 equipment 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 (eg, base station B1 ) in the single frequency network 121 can respond to the specific service continuity configuration. The service continuity configuration provides the second specific system information signaling according to the needs of each user device (eg, the user device U1 ) in the SFN 121 according to the second cycle (which can be determined by the central control device 11 ), and according to each user device. According to the requirements, the first specific system information signaling and the second specific signaling are provided.

In addition, if the central control device 11 selects the third or fourth service continuity configuration as the other specific service continuity configuration, each base station (eg base station B2) in the single frequency network 122 will be required to mix and match 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 a fourth embodiment of the present invention. In FIG. 9A , it is assumed that the user equipment U1 determines that a service continuity event occurs when receiving the broadcast multicast service A (eg, the handover from the base station B1 to the base station B2 ). In this case, the user equipment U1 may attempt 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 request the HB by sending the request block to the base station B1. Correspondingly, the base station B1 can return a response block indicating HB.

If the user equipment U1 successfully hears 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 handover to the base station B2. .

Referring to FIG. 9B , if the user equipment U1 fails to successfully hear the response block transmitted by the base station B1 before handing over to the base station B2, after the handover to the base station B2, the user equipment U1 can provide 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.

Afterwards, in case 1, the user equipment U1 may send a request block for requesting a CB to the base station B2. Correspondingly, the base station B2 can return the response block indicating the CB. If the user equipment U1 successfully hears 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 handover to the base station B2. .

In addition, in case 2, the user equipment 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 equipment 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.

To sum up, the central control device of the present invention can adjust the way that the SFN provides HB and CB based on the service continuity parameters provided by the base station, thereby reducing the amount of system control information and meeting service quality requirements.

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

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

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 Multicast 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 a broadcast multicast service according to an embodiment of the present invention. FIG. 2A is a schematic diagram of obtaining HB by a user equipment according to an embodiment of the present invention. FIG. 2B is a schematic diagram of obtaining a CB according to the user equipment shown in FIG. 2A . FIG. 3A is a schematic diagram of periodic transmission of system information signaling according to an embodiment of the present invention. FIG. 3B is a schematic diagram of on-demand transmission of system information signaling according to an embodiment of the present invention. FIG. 3C is a schematic diagram of the HTS information signaling according to FIG. 3A and FIG. 3B . FIG. 4 is a flowchart of a method for maintaining continuity of a broadcast multicast service 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. FIG. 5B is according to FIG. 5A in different

and

A schematic diagram of a service continuity configuration that produces the least amount of control signaling below. 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 a second embodiment of the present invention. 8A and 8B are schematic diagrams of maintaining service continuity according to a third embodiment of the present invention. 9A and 9B are schematic diagrams of maintaining service continuity according to a fourth embodiment of the present invention.

S410~S430: Steps

Claims (14)

A system for maintaining continuity of broadcast multicast services, comprising: a central control device that manages a first single frequency network and a second single frequency network adjacent to it, wherein the first single frequency network includes a plurality of base stations, each of which 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, wherein the service continuity parameters include a first demand rate of the user equipments for a first specific system information signaling and a second demand rate of the user equipments 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 for 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 of the base stations in the first single frequency network is required to adopt the specific service continuity configuration in a second configuration update period subsequent to the first configuration update period. The system of 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 so that 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 of claim 2, wherein the preset service continuity configurations include a first service continuity configuration, and in response to the specific service continuity configuration being the first service continuity configuration, the first single frequency Each of the base stations in the network provides the first specific system information signaling according to a first period and provides the second specific system information signaling according to a second period according to the specific service continuity configuration. The system of claim 3, wherein the step of selecting the specific service continuity configuration from the preset service continuity configurations based on the service continuity parameters comprises: 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 of claim 2, wherein the preset service continuity configurations include a second service continuity configuration, and in response to the specific service continuity configuration being the second service continuity configuration, the first single frequency Each of the base stations in the network provides the first specific system information signaling according to the requirements of each of the user equipments according to the specific service continuity configuration, and provides the second specific system information signaling according to a second period. The system of claim 5, wherein the step of selecting the specific service continuity configuration from the preset service continuity configurations based on the service continuity parameters comprises: 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 of claim 2, wherein the preset service continuity configurations include a third service continuity configuration, and in response to the specific service continuity configuration being the third service continuity configuration, the first single frequency Each of the base stations in the network periodically transmits the first specific system information signaling and the second specific system information signaling according to the specific service continuity configuration, and provides the first specific system information signaling according to the requirements of each user device. 2. Specific system information signaling. The system of claim 7, wherein the step of selecting the specific service continuity configuration from the preset service continuity configurations based on the service continuity parameters comprises: In response to determining that the first demand rate is greater than a first threshold value but less than a second threshold value, the third service continuity configuration is selected as the specific service continuity configuration. The system of claim 2, wherein the preset service continuity configurations include a fourth service continuity configuration, and in response to the specific service continuity configuration being the fourth service continuity configuration, the first single frequency Each of the base stations in the network periodically provides the second specific system information signaling according to the specific service continuity configuration, and provides the first specific system information signaling and the first specific system information signaling according to the requirements of each user device. Two specific signaling. The system of claim 9, wherein the step of selecting the specific service continuity configuration from the preset service continuity configurations based on the service continuity parameters comprises: 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 of claim 1, further comprising a first user equipment served by a first base station among the base stations, wherein the first user equipment passes through the first base station in the second configuration update period The specific service continuity configuration is obtained from a specific system information block provided by the station. The system of claim 11, wherein the first user device is configured to: In response to determining that the first base station needs to be handed over to a second base station belonging to the second SFN, attempting to obtain the first specific system information signaling from the first base station according to the specific service continuity configuration ; In response to determining that the first specific system information signaling is successfully obtained before the handover to the second base station, after the handover to the second base station, the broadcast multicast service is continuously obtained according to the first specific system information signaling . The system of claim 12, wherein the first user device is further configured to: In response to determining that the first specific system information signaling cannot be successfully obtained before handing over to the second base station, after handing over to the second base station, obtain from the second base station a signal corresponding to the second Another specific service continuity configuration for the frequency network; obtaining 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 continuity of broadcast multicast service, suitable for a central control device, wherein the central control device manages a first single frequency network and a second single frequency network in the vicinity, wherein the first single frequency network includes a plurality of a base station, each of which serves a plurality of user equipments, the method comprising: In a first configuration update period, each base station is required to return a plurality of service continuity parameters, wherein the service continuity parameters include a first demand rate of the user equipments for a first specific system information signaling and a second demand rate of the user equipments 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 for 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 of the base stations in the first single frequency network is required to adopt the specific service continuity configuration in a second configuration update period subsequent to the first configuration update period.

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