WO2009026821A1 - Multicast admission control method, device and system - Google Patents

Multicast admission control method, device and system Download PDF

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Publication number
WO2009026821A1
WO2009026821A1 PCT/CN2008/072031 CN2008072031W WO2009026821A1 WO 2009026821 A1 WO2009026821 A1 WO 2009026821A1 CN 2008072031 W CN2008072031 W CN 2008072031W WO 2009026821 A1 WO2009026821 A1 WO 2009026821A1
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Prior art keywords
multicast
resource
admission control
request
network device
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PCT/CN2008/072031
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French (fr)
Chinese (zh)
Inventor
Jun Li
Huailong Gu
Ting Zou
Zhenzhu Lv
Xiaolian Zhang
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Huawei Technologies Co, .Ltd.
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Publication of WO2009026821A1 publication Critical patent/WO2009026821A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1863—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast comprising mechanisms for improved reliability, e.g. status reports

Definitions

  • the present invention relates to communication technologies, and in particular, to a method, device, and system for multicast admission control (AC, Admission Control). Background technique
  • the network bandwidth is generally very limited.
  • resources with high bandwidth consumption and no packet loss such as IPTV (Internet Protocol Television) video
  • RM Resource Management
  • admission control Admission Control
  • the resource admission control device implementing resource management and admission control functions may be a resource admission control system (RACS) defined by ETSI TISPAN, or may be an resource admission control function defined by ITU-T (RACF, Resource and Admission).
  • Control Function which can also be a feature server (PS, Policy Server) or other device or device that implements similar functions.
  • IPTV service In the IPTV service, it includes two services: multicast/broadcast video and unicast video. Among them, unicast video services such as video on demand (VOD, Video On Demand) services. Since the multicast and unicast service modes are very different, the implementation of AC functions is also different.
  • VOD Video On Demand
  • the multicast request is sent to the access node (AN, Access Node), and the AN actively reports the channel information requested by the user to the resource admission control device, and the resource admission control device determines whether the link bandwidth of the user is Satisfy the demand, if the demand is not met, notify the AN to reject the user's request to join the channel.
  • This scheme needs to interact with the resource admission control device when switching the multicast service channel, and the handover time is long. Poor experience.
  • the implementation of the solution is complicated, and the multicast service has a higher switching frequency than the unicast service.
  • the AN needs to report the user channel switching information to the resource admission control device. Information interaction, the performance requirements of AN is very high. Summary of the invention
  • the embodiment of the invention provides a method for multicast admission control AC, which ensures fast switching of multicast service channels.
  • the embodiment of the invention further provides a network device to ensure fast switching of a multicast service channel.
  • the embodiment of the invention further provides a multicast AC system, which ensures fast switching of multicast service channels.
  • a multicast AC method in which a multicast resource is set in advance for a multicast service, where the method includes:
  • the network device receives the multicast request and performs the multicast resource AC operation for the multicast request.
  • the multicast resource is insufficient, the multicast request is still accepted, and the corresponding multicast stream is marked as a low priority.
  • a network device including a multicast protocol processing module, a local resource admission control function module, and a multicast replication module,
  • a multicast protocol processing module configured to receive and process a multicast request
  • the local resource admission control function module is configured to perform a connection admission control AC operation for the multicast request, and when it is determined that the resource is insufficient, send a trigger signal for performing low priority multicast replication to the multicast replication module;
  • the multicast replication module is configured to mark the corresponding multicast stream as a low priority after receiving the trigger signal for low priority multicast replication sent by the local resource admission control function module, so that the multicast replication is performed.
  • the module performs multicast replication at the marked priority.
  • a multicast AC system including a user equipment and a network device, where the user equipment is configured to send a multicast request to the network device; and receive the multicast stream corresponding to the network device for multicast replication;
  • the network device is configured to receive a multicast request, and perform a multicast resource AC operation for the multicast request.
  • the multicast request is still accepted, and the corresponding multicast stream is marked as a low priority.
  • the technical solution provided by the embodiment of the present invention allocates a multicast resource for a multicast service.
  • the network device performs an AC operation on the received multicast request to determine that the multicast resource is insufficient, the user still The device performs multicast replication and marks the multicast stream corresponding to the multicast replication as low priority. It can be seen that, in the technical solution of the embodiment of the present invention, the network device controls the allocated multicast resource, and does not need to perform information interaction with the resource admission control device when performing multicast channel switching, thereby saving time for information interaction during channel switching.
  • the network device can perform low-priority multicast replication when determining that its own multicast resource is insufficient, so that when the channel is switched, the multicast fast channel switching can be implemented, and the new multicast stream is not affected by insufficient resources.
  • the original multicast stream can perform low-priority multicast replication when determining that its own multicast resource is insufficient, so that when the channel is switched, the multicast fast channel switching can be implemented, and the new multicast stream is not affected by insufficient resources.
  • the original multicast stream can perform low-priority multicast replication when determining that its own multicast resource is insufficient, so that when the channel is switched, the multicast fast channel switching can be implemented, and the new multicast stream is not affected by insufficient resources.
  • FIG. 1 is a flowchart of a method for multicasting AC in an embodiment of the present invention
  • FIG. 2 is a flowchart of a multicast request/release method under a threshold according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a multicast request/release method above a threshold according to an embodiment of the present invention
  • FIG. 5 is a system structural diagram of a multicast AC according to an embodiment of the present invention. detailed description
  • FIG. 1 is a flowchart of a method for multicasting an AC according to an embodiment of the present invention. As shown in Figure 1, the method includes the following steps:
  • step S100 a multicast resource is set in advance for the multicast service; when the network device receives the multicast request in step S101, the multicast resource AC operation is performed for the multicast request; and when the multicast resource is insufficient, it is determined in step S102. , multicast replication for the multicast request, and marking the corresponding multicast flow as low priority.
  • the network device may be a network device with a built-in local resource admission control function, or an AN with a built-in local resource admission control function; the source of the multicast request may be a user device or a network device from a downstream device.
  • a multicast resource threshold is further set for the multicast service.
  • the network device performs an AC operation for the multicast request, first detecting that the sum of the resources currently occupied by the multicast resource and the multicast request is compared with the set multicast resource threshold to determine the currently occupied multicast. The sum of the resources required for the resource and the multicast request is above or below the set multicast resource threshold.
  • the flow chart is executed according to the method shown in Figure 2. When above the threshold, Performed according to the method flow chart shown in Figure 2 or Figure 3.
  • the network device is an AN that has a built-in local resource admission control function
  • the multicast request is from the user equipment.
  • local resource admission control functions such as X-RACF (X-Resource and Admission Control Function).
  • FIG. 2 is a flow chart showing a multicast request/release method under the threshold in the embodiment of the present invention. As shown in Figure 2, the method includes the following steps:
  • Step S200 The user equipment sends a multicast request to the local resource admission control function entity in the access node, such as an Internet Group Management Protocol (IGMP).
  • IGMP Internet Group Management Protocol
  • the multicast request in this step may be a request for the user to join the multicast channel, or a request for the user to switch from one multicast service channel to another multicast service channel.
  • Step S201 The local resource admission control function entity in the access node performs a connection admission control operation for the multicast request.
  • Step S202 The access node performs multicast replication to the user equipment.
  • Step S203 The user equipment sends a multicast stop request, such as an IGMP leave message, to the local resource admission control function entity in the access node.
  • a multicast stop request such as an IGMP leave message
  • Step S204 The local resource admission control function entity in the access node performs an admission control operation for the multicast suspension request, and stops multicast replication to the user equipment.
  • FIG. 3 is a flowchart of a multicast request/release method above a threshold in an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
  • Step S300 to step S301 the user equipment sends a multicast request, such as an IGMP join message, to the local resource admission control function entity in the access node.
  • the local resource admission control function entity in the access node performs admission control on the multicast request. operating.
  • Step S302 When the local resource admission control function entity in the access node determines that the multicast resources managed by the local resource are insufficient, perform multicast replication to the user equipment, and mark the corresponding multicast stream as the priority.
  • the local resource admission control function entity in the access node determines that the sum of the currently occupied multicast resource and the multicast resource required by the user equipment multicast request exceeds a preset multicast resource threshold, and determines the multicast. lack of resources.
  • the multicast stream corresponding to the multicast replication is marked as a low priority, which ensures that the user's multicast request is satisfied as much as possible without affecting the original service flow of the user.
  • the specific process of performing multicast replication on the user equipment and marking the priority of the multicast stream in this step is a prior art and will not be described in detail herein.
  • Steps S303 to S304 The local resource admission control function entity in the access node sends an external resource request to the resource admission control device; the resource admission control device performs connection admission control for the external resource request from the access node.
  • Step S305 to step S306 the resource admission control device sends an external resource allocation to the local resource admission control function entity in the access node; the local resource admission control function entity in the access node re-transmits the corresponding multicast stream addressed to the user equipment. Mark as high priority.
  • the AC process of performing the multicast stop includes: Step S307 to step S308: the user equipment sends a multicast stop, such as an IGMP leave message, to the local resource admission control function entity in the access node; The local resource admission control function entity in the access node performs admission control for multicast; the local resource admission control function entity in the access node stops multicast replication.
  • a multicast stop such as an IGMP leave message
  • Step S309 The local resource admission control function entity in the access node releases the resource to accept the external resource allocated by the control device.
  • This step may be performed after a preset timer expires; or may be performed when the unicast resource of the resource admission control device is insufficient; or when the unicast resource of the resource admission control device is insufficient, to the local in the access node
  • the resource admission control function entity executes when requesting external resources; or executes immediately; or according to a preset return policy, such as setting a threshold for return (percentage or bandwidth size).
  • the resource admission control function entity in the access node borrows the unicast resource of the resource admission control device
  • the resource admission control The device may use a mandatory request method, that is, when the unicast resource of the resource admission control device is insufficient, the resource admission control device may force the local resource admission control function entity in the access node to interrupt some multicast services, which will be borrowed. The resources are still back.
  • FIG. 4 is a flowchart of a method for multicast rejection above a threshold in an embodiment of the present invention. As shown in Figure 4, the method includes the following steps:
  • Steps S400 to S404 are the same as steps S300 to S304, and will not be described in detail herein.
  • Step S405 When the resource admission control device determines that the unicast resource is insufficient, it sends information rejecting the external resource request to the local resource admission control function entity in the access node.
  • Step S406 The local resource admission control function entity in the access node stops performing corresponding multicast replication to the user equipment.
  • FIG. 5 is a structural diagram of a system of a multicast AC according to an embodiment of the present invention. As shown in FIG. 5, the system includes a user equipment 51 and a network device 52.
  • the user equipment 51 is configured to send a multicast request to the network device 52, and receive a multicast stream from the network device.
  • the network device 52 is configured to receive a multicast request, perform a multicast resource AC operation for the multicast request, and when the multicast resource is determined to be insufficient, the multicast request is still accepted, and the corresponding multicast stream is marked as a low priority.
  • the system may further include a resource admission control device 53 at which time the network device 52 further transmits an external resource request to the resource admission control device 53; marking the multicast stream as a high priority based on the result of the AC operation in response to the external resource request And stopping the multicast replication, wherein the resource admission control device 53 returns a result of the AC operation to the network device in response to the external resource request; the resource admission control device 53 is configured to perform an AC operation on the external resource request of the network device 52, The result of the operation is sent to the network device 52.
  • the network device 52 includes: a multicast protocol processing module 521, a local resource admission control function module 522, and a multicast replication module 523.
  • the multicast protocol processing module 521 receives and processes the multicast request, and the module processes the multicast request in the same manner as the prior art, and details are not described herein.
  • the local resource admission control function module 522 is configured to perform an AC operation for the multicast request, and when it is determined that the resource is insufficient, send a trigger signal for performing low priority multicast replication to the multicast replication module 523.
  • the multicast replication module 523 After receiving the trigger signal for performing low-priority multicast replication sent by the local resource admission control function module 522, the multicast replication module 523 marks the corresponding multicast stream as a low priority, so that the multicast replication module prioritizes the label. Level performs multicast replication.
  • the local resource admission control function module 522 further sends an external resource request to the resource admission control device 53; receives the AC operation result sent by the resource admission control device 53, and sends the result to the multicast replication module 523 when the AC operation result is an external resource request.
  • the multicast stream is marked as a high-priority trigger signal.
  • the multicast replication module 523 sends a trigger signal for stopping the multicast replication. Accordingly, the multicast replication module 523 further receives the trigger signal.
  • the multicast stream is marked as a high-priority trigger signal
  • the multicast stream is marked as a high priority; after receiving the trigger signal for stopping the multicast replication sent by the local resource admission control function module 522, the multicast is stopped. copy.
  • the multicast protocol processing module 521 can also receive the multicast stop request.
  • the local resource admission control function module 522 further performs an AC operation on the multicast stop request, and sends a trigger signal for stopping the multicast replication to the multicast replication module 523, and releases the slave signal.
  • the resource accepts external resources requested by the control device 53.
  • the local resource admission control function module 522 further sends a trigger signal for stopping the multicast replication to the multicast replication module 523 when the external resource request sent by the resource admission control device 53 is received, and releases the external resource requested from the resource admission control device 53. .
  • the technical solution provided by the embodiment of the present invention allocates multicast resources for the multicast service.
  • the network device performs AC operation on the received multicast request and determines that the multicast resource is insufficient, it is still The multicast request is used for multicast replication.
  • the multicast traffic corresponding to the multicast replication is marked as a low priority.
  • the network device 52 controls the allocated multicast resource, and does not need to perform information interaction with the resource admission control device when performing multicast channel switching, thereby saving information interaction during channel switching. time.
  • the network device 53 can perform low-priority multicast replication when determining that its own multicast resource is insufficient, so that when the channel is switched, the multicast fast channel switching can be implemented, and the new multicast stream is not caused by insufficient resources. Affect the original multicast stream.
  • the technical solution of the embodiment of the present invention controls the allocated multicast resource by the network device with the local resource admission control function, manages the multicast service, and does not need to report the channel switching information to the resource admission control device 53, thereby performing channel on a large number of users.
  • the resource admission control device 53 does not need to perform a large amount of information interaction, which reduces the complexity of the AN implementation; and can satisfy the user requirements and provide the multicast service for the user without affecting other service flows;
  • the multicast replication can be performed without interaction with the resource admission control device, thereby reducing the handover delay and realizing fast switching of the multicast channel.
  • the network device 52 performs a multicast resource AC operation for the received multicast request, and when determining that the multicast resource is insufficient, performs multicast replication for the multicast request, and performs corresponding multicast.
  • the flow is marked as a low priority; the external resource is further requested from the resource admission control device 53.
  • the resource admission control device 53 has sufficient resources to accept the external resource request, the low priority multicast replication is re-marked as a high priority, and only When the resource admission control device 53 has insufficient resources, the multicast request is rejected. Therefore, the solution of the embodiment of the present invention implements sharing of multicast and unicast resources, improves resource utilization, and avoids resource waste.

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Abstract

A multicast admission control method allocates a multicast resource for a multicast service. The method includes: a network device (52) receiving a multicast request, performing a multicast resource AC operation for the multicast request, when the multicast resource is not enough, the network device (52) performing the multicast duplication according to the multicast request, and marking the corresponding multicast flow with a low priority level. A multicast admission control system, a network device (52), includes a multicast agreement processing module (521), a local resource admission control functional module (522) and a multicast duplication module (523).

Description

一种组播接纳控制的方法、 装置及***  Method, device and system for multicast admission control
技术领域 Technical field
本发明涉及通信技术， 具体涉及一种组播接纳控制 （AC , Admission Control ) 的方法、 装置及***。 背景技术  The present invention relates to communication technologies, and in particular, to a method, device, and system for multicast admission control (AC, Admission Control). Background technique
网络带宽尤其是用户链路带宽一般都非常有限，对于高带宽消耗 且不允许丟包的业务， 例如网络电视 ( IPTV , Internet Protocol Television )视频， 为保证视频业务有效开展， 保证业务质量， 必须在 网络中部署资源管理（ RM, Resource Management )和接纳控制（ AC, Admission Control )功能。 实现资源管理和接纳控制功能的资源接纳 控制设备可以是 ETSI TISPAN 定义的资源接纳控制***（RACS, Resource and Admission Control System ),也可以是 ITU-T定义的资源 接纳控制功能 ( RACF, Resource and Admission Control Function ), 也 可以是策略服务器（ PS , Policy Server )或其它实现类似功能的设备 或设备的功能部件。  The network bandwidth, especially the user link bandwidth, is generally very limited. For services with high bandwidth consumption and no packet loss, such as IPTV (Internet Protocol Television) video, in order to ensure the effective development of video services and ensure the quality of services, Resource management (RM, Resource Management) and admission control (AC, Admission Control) functions are deployed in the network. The resource admission control device implementing resource management and admission control functions may be a resource admission control system (RACS) defined by ETSI TISPAN, or may be an resource admission control function defined by ITU-T (RACF, Resource and Admission). Control Function ), which can also be a feature server (PS, Policy Server) or other device or device that implements similar functions.
在 IPTV业务中，包括组播 /广播视频和单播视频两种业务，其中， 单播视频业务如视频点播（VOD, Video On Demand ) 业务。 由于组 播和单播业务模式差别很大， 其 AC功能的实现也有所不同。  In the IPTV service, it includes two services: multicast/broadcast video and unicast video. Among them, unicast video services such as video on demand (VOD, Video On Demand) services. Since the multicast and unicast service modes are very different, the implementation of AC functions is also different.
在实现本发明的过程中， 发明人发现现有技术至少存在以下问 题：  In carrying out the process of the present invention, the inventors have found that the prior art has at least the following problems:
用户加入某个频道时， 向接入节点 （AN, Access Node )发送组 播请求， AN主动向资源接纳控制设备上报用户请求加入的频道信息， 由资源接纳控制设备判断该用户的链路带宽是否满足需求，如果不满 足需求， 则通知 AN拒绝该用户加入频道的请求。 这种方案在进行组 播业务频道切换时需要和资源接纳控制设备交互， 切换时间长， 用户 体验差。 When the user joins a certain channel, the multicast request is sent to the access node (AN, Access Node), and the AN actively reports the channel information requested by the user to the resource admission control device, and the resource admission control device determines whether the link bandwidth of the user is Satisfy the demand, if the demand is not met, notify the AN to reject the user's request to join the channel. This scheme needs to interact with the resource admission control device when switching the multicast service channel, and the handover time is long. Poor experience.
同时， 该方案实现复杂， 而且组播业务比单播业务切换频率大， 任何用户进行频道切换时，都需要 AN向资源接纳控制设备上报用户 频道切换信息， 大量用户频繁切换频道时就会导致大量的信息交互， 对 AN的性能要求非常高。 发明内容  At the same time, the implementation of the solution is complicated, and the multicast service has a higher switching frequency than the unicast service. When any user performs channel switching, the AN needs to report the user channel switching information to the resource admission control device. Information interaction, the performance requirements of AN is very high. Summary of the invention
本发明实施例提供一种组播接纳控制 AC的方法，保证组播业务 频道的快速切换。  The embodiment of the invention provides a method for multicast admission control AC, which ensures fast switching of multicast service channels.
本发明实施例还提供一种网络设备，保证组播业务频道的快速切 换。  The embodiment of the invention further provides a network device to ensure fast switching of a multicast service channel.
本发明实施例还提供一种组播 AC的***，保证组播业务频道的 快速切换。  The embodiment of the invention further provides a multicast AC system, which ensures fast switching of multicast service channels.
为达到上述目的， 本发明实施例的技术方案是这样实现的： 一种组播 AC的方法， 预先为组播业务设置组播资源， 该方法包 括：  To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows: A multicast AC method, in which a multicast resource is set in advance for a multicast service, where the method includes:
网络设备接收组播请求， 为组播请求进行组播资源 AC操作， 当 组播资源不足时， 仍然接纳该组播请求， 并将对应的组播流标记为低 优先级。  The network device receives the multicast request and performs the multicast resource AC operation for the multicast request. When the multicast resource is insufficient, the multicast request is still accepted, and the corresponding multicast stream is marked as a low priority.
一种网络设备， 包括组播协议处理模块、 本地资源接纳控制功能 模块和组播复制模块，  A network device, including a multicast protocol processing module, a local resource admission control function module, and a multicast replication module,
组播协议处理模块， 用于接收并处理组播请求；  a multicast protocol processing module, configured to receive and process a multicast request;
本地资源接纳控制功能模块，用于为组播请求进行连接接纳控制 AC操作， 当确定资源不足时， 向组播复制模块发送进行低优先级组 播复制的触发信号；  The local resource admission control function module is configured to perform a connection admission control AC operation for the multicast request, and when it is determined that the resource is insufficient, send a trigger signal for performing low priority multicast replication to the multicast replication module;
组播复制模块，用于在接收到所述本地资源接纳控制功能模块发 送的进行低优先级组播复制的触发信号后，将对应的组播流标记为低 优先级， 使得所述组播复制模块按标记的优先级执行组播复制。 一种组播 AC的***， 包括用户设备和网络设备， 用户设备， 用于向网络设备发送组播请求； 接收网络设备进行组 播复制对应的组播流； The multicast replication module is configured to mark the corresponding multicast stream as a low priority after receiving the trigger signal for low priority multicast replication sent by the local resource admission control function module, so that the multicast replication is performed. The module performs multicast replication at the marked priority. A multicast AC system, including a user equipment and a network device, where the user equipment is configured to send a multicast request to the network device; and receive the multicast stream corresponding to the network device for multicast replication;
网络设备， 用于接收组播请求， 为组播请求进行组播资源 AC操 作， 当确定组播资源不足时， 仍然接纳该组播请求， 并将对应的组播 流标记为低优先级。  The network device is configured to receive a multicast request, and perform a multicast resource AC operation for the multicast request. When determining that the multicast resource is insufficient, the multicast request is still accepted, and the corresponding multicast stream is marked as a low priority.
与现有技术相比， 本发明实施例所提供的技术方案， 为组播业务 分配组播资源， 当网络设备对接收到的组播请求进行 AC操作， 确定 组播资源不足时， 仍然对用户设备进行组播复制， 将该组播复制对应 的组播流标记为低优先级。 可见， 本发明实施例的技术方案中， 由网 络设备控制分配的组播资源， 在进行组播频道切换时， 不需要与资源 接纳控制设备进行信息交互， 节省了频道切换时信息交互的时间。  Compared with the prior art, the technical solution provided by the embodiment of the present invention allocates a multicast resource for a multicast service. When the network device performs an AC operation on the received multicast request to determine that the multicast resource is insufficient, the user still The device performs multicast replication and marks the multicast stream corresponding to the multicast replication as low priority. It can be seen that, in the technical solution of the embodiment of the present invention, the network device controls the allocated multicast resource, and does not need to perform information interaction with the resource admission control device when performing multicast channel switching, thereby saving time for information interaction during channel switching.
而且可以网络设备在确定自身的组播资源不足时，进行低优先级 的组播复制， 从而在频道切换时， 可以实现组播快速频道切换， 又不 会因为资源不足而造成新组播流影响原有的组播流。  Moreover, the network device can perform low-priority multicast replication when determining that its own multicast resource is insufficient, so that when the channel is switched, the multicast fast channel switching can be implemented, and the new multicast stream is not affected by insufficient resources. The original multicast stream.
同时， 由于不需要网络设备在每一次频道切换时， 向资源接纳控 制设备上报大量的交互信息， 从而使得该网络设备实现的复杂度降 低。 附图说明  At the same time, since the network device does not need to report a large amount of interaction information to the resource admission control device during each channel switching, the complexity of the network device implementation is reduced. DRAWINGS
图 1为本发明实施例中组播 AC的方法流程图；  1 is a flowchart of a method for multicasting AC in an embodiment of the present invention;
图 2为本发明实施例中门限之下的组播请求 /释放方法流程图； 图 3为本发明实施例中门限之上的组播请求 /释放方法流程图； 图 4为本发明实施例中门限之上的组播拒绝方法流程图； 图 5为本发明实施例中组播 AC的***结构图。 具体实施方式  2 is a flowchart of a multicast request/release method under a threshold according to an embodiment of the present invention; FIG. 3 is a flowchart of a multicast request/release method above a threshold according to an embodiment of the present invention; A flowchart of a multicast refusal method above a threshold; FIG. 5 is a system structural diagram of a multicast AC according to an embodiment of the present invention. detailed description
下面结合附图及具体实施例对本发明进行详细说明。 本发明实施例中的组播方法预先为组播业务分配组播资源，该组 播资源由内置本地资源接纳控制功能的网络设备单独控制，为组播业 务分配组播资源。 图 1为本发明实施例中组播 AC的方法流程图。 如 图 1所示， 该方法包括以下步骤： The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The multicast method in the embodiment of the present invention allocates multicast resources for the multicast service in advance, and the multicast resources are separately controlled by the network device with the built-in local resource admission control function, and the multicast resources are allocated for the multicast service. FIG. 1 is a flowchart of a method for multicasting an AC according to an embodiment of the present invention. As shown in Figure 1, the method includes the following steps:
在步骤 S100中， 预先为组播业务设置组播资源； 当在步骤 S101 网络设备接收到组播请求时， 为该组播请求进行组播资源 AC操作； 并在步骤 S102确定组播资源不足时， 为该组播请求进行组播复制， 并将对应的组播流标记为低优先级。  In step S100, a multicast resource is set in advance for the multicast service; when the network device receives the multicast request in step S101, the multicast resource AC operation is performed for the multicast request; and when the multicast resource is insufficient, it is determined in step S102. , multicast replication for the multicast request, and marking the corresponding multicast flow as low priority.
其中， 网络设备可以是内置本地资源接纳控制功能的网络设备， 或内置本地资源接纳控制功能的 AN; 组播请求的来源可以是用户设 备， 也可以是来自下游的网络设备。  The network device may be a network device with a built-in local resource admission control function, or an AN with a built-in local resource admission control function; the source of the multicast request may be a user device or a network device from a downstream device.
本发明实施例中为组播业务分配组播资源时进一步为组播业务 设置组播资源门限。 步骤 S102中网络设备为组播请求进行 AC操作 中，首先检测当前被占用的组播资源与组播请求所需的资源之和与设 置的组播资源门限进行比较以确定当前被占用的组播资源与组播请 求所需的资源之和是在设置的组播资源门限之上或之下， 当在门限之 下时， 按图 2所示的方法流程图执行， 当在门限之上时， 按图 2或图 3所示的方法流程图执行。  In the embodiment of the present invention, when a multicast resource is allocated for a multicast service, a multicast resource threshold is further set for the multicast service. In step S102, the network device performs an AC operation for the multicast request, first detecting that the sum of the resources currently occupied by the multicast resource and the multicast request is compared with the set multicast resource threshold to determine the currently occupied multicast. The sum of the resources required for the resource and the multicast request is above or below the set multicast resource threshold. When under the threshold, the flow chart is executed according to the method shown in Figure 2. When above the threshold, Performed according to the method flow chart shown in Figure 2 or Figure 3.
下面以网络设备为内置本地资源接纳控制功能的 AN, 组播请求 来自用户设备为例，对本发明实施例的组播 AC的方法进行详细说明。 这里， 本地资源接纳控制功能如 X-RACF ( X-Resource and Admission Control Function )。  The following is a detailed description of the method for the multicast AC in the embodiment of the present invention, in which the network device is an AN that has a built-in local resource admission control function, and the multicast request is from the user equipment. Here, local resource admission control functions such as X-RACF (X-Resource and Admission Control Function).
图 2 所示为本发明实施例中门限之下的组播请求 /释放方法流程 图。 如图 2所示， 该方法包括以下步骤：  FIG. 2 is a flow chart showing a multicast request/release method under the threshold in the embodiment of the present invention. As shown in Figure 2, the method includes the following steps:
步骤 S200: 用户设备向接入节点中的本地资源接纳控制功能实 体发送组播请求， 如因特网组管理协议 （ IGMP , Internet Group Management Protocol )力口入才艮文。  Step S200: The user equipment sends a multicast request to the local resource admission control function entity in the access node, such as an Internet Group Management Protocol (IGMP).
本步骤中的组播请求可以是用户加入组播频道的请求，也可以是 用户由一个组播业务频道切换至另一个组播业务频道的请求。 步骤 S201 : 接入节点中的本地资源接纳控制功能实体为该组播 请求进行连接接纳控制操作。 The multicast request in this step may be a request for the user to join the multicast channel, or a request for the user to switch from one multicast service channel to another multicast service channel. Step S201: The local resource admission control function entity in the access node performs a connection admission control operation for the multicast request.
步骤 S202: 接入节点向用户设备进行组播复制。  Step S202: The access node performs multicast replication to the user equipment.
当用户不需要继续使用组播业务时， 组播停止的 AC过程包括： 步骤 S203: 用户设备向接入节点中的本地资源接纳控制功能实 体发送组播停止请求， 如 IGMP离开报文。  When the user does not need to continue to use the multicast service, the AC process of stopping the multicast includes: Step S203: The user equipment sends a multicast stop request, such as an IGMP leave message, to the local resource admission control function entity in the access node.
步骤 S204: 接入节点中的本地资源接纳控制功能实体为组播停 止请求执行接纳控制操作， 停止向用户设备进行组播复制。  Step S204: The local resource admission control function entity in the access node performs an admission control operation for the multicast suspension request, and stops multicast replication to the user equipment.
图 3 为本发明实施例中门限之上的组播请求 /释放方法流程图。 如图 3所示， 该方法包括以下步骤：  FIG. 3 is a flowchart of a multicast request/release method above a threshold in an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
步骤 S300〜步骤 S301 :用户设备向接入节点中的本地资源接纳控 制功能实体发送组播请求， 如 IGMP加入报文； 接入节点中的本地资 源接纳控制功能实体为该组播请求进行接纳控制操作。  Step S300 to step S301: the user equipment sends a multicast request, such as an IGMP join message, to the local resource admission control function entity in the access node. The local resource admission control function entity in the access node performs admission control on the multicast request. operating.
步骤 S302: 当接入节点中的本地资源接纳控制功能实体确定本 身所管理的组播资源不足时， 向用户设备进行组播复制， 并将对应的 组播流标记为氏优先级。  Step S302: When the local resource admission control function entity in the access node determines that the multicast resources managed by the local resource are insufficient, perform multicast replication to the user equipment, and mark the corresponding multicast stream as the priority.
本步骤中，接入节点中的本地资源接纳控制功能实体判断当前所 占用的组播资源与用户设备组播请求所需的组播资源之和超出预设 的组播资源门限时， 确定组播资源不足。  In this step, the local resource admission control function entity in the access node determines that the sum of the currently occupied multicast resource and the multicast resource required by the user equipment multicast request exceeds a preset multicast resource threshold, and determines the multicast. lack of resources.
本步骤将组播复制对应的组播流标记为低优先级，可以保证在不 影响用户原有业务流的情况下， 尽量满足用户的组播请求。 本步骤为 用户设备进行组播复制及如何标记组播流的优先级的具体过程为现 有技术， 在此不再详述。  In this step, the multicast stream corresponding to the multicast replication is marked as a low priority, which ensures that the user's multicast request is satisfied as much as possible without affecting the original service flow of the user. The specific process of performing multicast replication on the user equipment and marking the priority of the multicast stream in this step is a prior art and will not be described in detail herein.
步骤 S303〜步骤 S304:接入节点中的本地资源接纳控制功能实体 向资源接纳控制设备发送外部资源请求；资源接纳控制设备为来自接 入节点的外部资源请求进行连接接纳控制。  Steps S303 to S304: The local resource admission control function entity in the access node sends an external resource request to the resource admission control device; the resource admission control device performs connection admission control for the external resource request from the access node.
步骤 S305〜步骤 S306:资源接纳控制设备向接入节点中的本地资 源接纳控制功能实体发送外部资源分配；接入节点中的本地资源接纳 控制功能实体将发向该用户设备的对应组播流重新标记为高优先级。 当用户不再需要组播业务时， 进行组播停止的 AC过程包括： 步骤 S307〜步骤 S308:用户设备向接入节点中的本地资源接纳控 制功能实体发送组播停止， 如 IGMP离开报文； 接入节点中的本地资 源接纳控制功能实体为组播进行接纳控制；接入节点中的本地资源接 纳控制功能实体停止组播复制。 Step S305 to step S306: the resource admission control device sends an external resource allocation to the local resource admission control function entity in the access node; the local resource admission control function entity in the access node re-transmits the corresponding multicast stream addressed to the user equipment. Mark as high priority. When the user no longer needs the multicast service, the AC process of performing the multicast stop includes: Step S307 to step S308: the user equipment sends a multicast stop, such as an IGMP leave message, to the local resource admission control function entity in the access node; The local resource admission control function entity in the access node performs admission control for multicast; the local resource admission control function entity in the access node stops multicast replication.
步骤 S309: 接入节点中的本地资源接纳控制功能实体释放资源 接纳控制设备分配的外部资源。  Step S309: The local resource admission control function entity in the access node releases the resource to accept the external resource allocated by the control device.
本步骤可以在一个预先设定的定时器超时之后执行；也可以是在 资源接纳控制设备的单播资源不足时执行；或者当资源接纳控制设备 的单播资源不足，向接入节点中的本地资源接纳控制功能实体请求外 部资源时执行； 或者马上执行； 或者根据预先设定的归还策略执行， 例如设定归还的门限（百分比或者带宽大小；)。  This step may be performed after a preset timer expires; or may be performed when the unicast resource of the resource admission control device is insufficient; or when the unicast resource of the resource admission control device is insufficient, to the local in the access node The resource admission control function entity executes when requesting external resources; or executes immediately; or according to a preset return policy, such as setting a threshold for return (percentage or bandwidth size).
另外，由于接入节点中的本地资源接纳控制功能实体借用资源接 纳控制设备的单播资源， 因此， 在接入节点中的本地资源接纳控制功 能实体使用外部资源进行组播业务时，资源接纳控制设备可以釆用强 制索取的方法， 即在资源接纳控制设备的单播资源不足时， 资源接纳 控制设备可以强行要求接入节点中的本地资源接纳控制功能实体中 断某些组播业务， 将借用的资源还回来。  In addition, since the local resource admission control function entity in the access node borrows the unicast resource of the resource admission control device, when the local resource admission control function entity in the access node uses the external resource to perform the multicast service, the resource admission control The device may use a mandatory request method, that is, when the unicast resource of the resource admission control device is insufficient, the resource admission control device may force the local resource admission control function entity in the access node to interrupt some multicast services, which will be borrowed. The resources are still back.
图 4为本发明实施例中门限之上组播拒绝的方法流程图。 如图 4 所示， 该方法包括以下步骤：  FIG. 4 is a flowchart of a method for multicast rejection above a threshold in an embodiment of the present invention. As shown in Figure 4, the method includes the following steps:
步骤 S400〜步骤 S404与步骤 S300〜步骤 S304相同， 在此不再详 述。  Steps S400 to S404 are the same as steps S300 to S304, and will not be described in detail herein.
步骤 S405: 资源接纳控制设备确定单播资源不足时， 向接入节 点中的本地资源接纳控制功能实体发送拒绝外部资源请求的信息。  Step S405: When the resource admission control device determines that the unicast resource is insufficient, it sends information rejecting the external resource request to the local resource admission control function entity in the access node.
步骤 S406: 接入节点中的本地资源接纳控制功能实体停止向该 用户设备进行对应的组播复制。  Step S406: The local resource admission control function entity in the access node stops performing corresponding multicast replication to the user equipment.
本例所描述的情况是指空闲的组播资源不满足用户的组播请求， 且资源接纳控制设备的空闲单播资源也不能满足组播请求时，拒绝用 户的组播请求。 图 5为本发明实施例中组播 AC的***结构图。 如图 5所示， 该 ***包括用户设备 51和网络设备 52。 The case described in this example is that when the idle multicast resource does not satisfy the multicast request of the user, and the idle unicast resource of the resource admission control device cannot satisfy the multicast request, the multicast request of the user is rejected. FIG. 5 is a structural diagram of a system of a multicast AC according to an embodiment of the present invention. As shown in FIG. 5, the system includes a user equipment 51 and a network device 52.
其中， 用户设备 51 , 用于向网络设备 52发送组播请求； 接收来 自网络设备的组播流。  The user equipment 51 is configured to send a multicast request to the network device 52, and receive a multicast stream from the network device.
网络设备 52 , 用于接收组播请求， 为组播请求执行组播资源 AC 操作， 当确定组播资源不足时， 仍然接纳该组播请求， 并将对应的组 播流标记为低优先级。  The network device 52 is configured to receive a multicast request, perform a multicast resource AC operation for the multicast request, and when the multicast resource is determined to be insufficient, the multicast request is still accepted, and the corresponding multicast stream is marked as a low priority.
该***还可包括资源接纳控制设备 53 , 此时， 网络设备 52进一 步向资源接纳控制设备 53发送外部资源请求； 根据响应该外部资源 请求的 AC操作的结果，将组播流标记为高优先级，或停止组播复制， 其中， 由资源接纳控制设备 53响应该外部资源请求， 向网络设备返 回 AC操作的结果； 资源接纳控制设备 53 , 用于对网络设备 52的外 部资源请求进行 AC操作， 并将操作结果发送到网络设备 52。  The system may further include a resource admission control device 53 at which time the network device 52 further transmits an external resource request to the resource admission control device 53; marking the multicast stream as a high priority based on the result of the AC operation in response to the external resource request And stopping the multicast replication, wherein the resource admission control device 53 returns a result of the AC operation to the network device in response to the external resource request; the resource admission control device 53 is configured to perform an AC operation on the external resource request of the network device 52, The result of the operation is sent to the network device 52.
具体来说， 该网络设备 52 包括： 组播协议处理模块 521、 本地 资源接纳控制功能模块 522和组播复制模块 523。  Specifically, the network device 52 includes: a multicast protocol processing module 521, a local resource admission control function module 522, and a multicast replication module 523.
其中， 组播协议处理模块 521接收并处理组播请求， 该模块处理 组播请求可与现有技术相同， 在此不再赘述。  The multicast protocol processing module 521 receives and processes the multicast request, and the module processes the multicast request in the same manner as the prior art, and details are not described herein.
本地资源接纳控制功能模块 522,用于为组播请求进行 AC操作， 当确定资源不足时，向组播复制模块 523发送进行低优先级组播复制 的触发信号。  The local resource admission control function module 522 is configured to perform an AC operation for the multicast request, and when it is determined that the resource is insufficient, send a trigger signal for performing low priority multicast replication to the multicast replication module 523.
组播复制模块 523在接收到本地资源接纳控制功能模块 522发送 的进行低优先级组播复制的触发信号后，将对应的组播流标记为低优 先级， 使得组播复制模块按标记的优先级执行组播复制。  After receiving the trigger signal for performing low-priority multicast replication sent by the local resource admission control function module 522, the multicast replication module 523 marks the corresponding multicast stream as a low priority, so that the multicast replication module prioritizes the label. Level performs multicast replication.
本地资源接纳控制功能模块 522进一步向资源接纳控制设备 53 发送外部资源请求； 接收资源接纳控制设备 53发送的 AC操作结果， 当 AC操作结果为接受外部资源请求时， 向组播复制模块 523发送将 组播流标记为高优先级的触发信号， 当 AC操作结果为拒绝外部资源 请求时，向组播复制模块 523发送停止组播复制的触发信号；相应地， 组播复制模块 523进一步在接收到本地资源接纳控制功能模块 522发 送的将组播流标记为高优先级的触发信号后，将组播流标记为高优先 级；在接收到本地资源接纳控制功能模块 522发送的停止组播复制的 触发信号后， 停止组播复制。 The local resource admission control function module 522 further sends an external resource request to the resource admission control device 53; receives the AC operation result sent by the resource admission control device 53, and sends the result to the multicast replication module 523 when the AC operation result is an external resource request. The multicast stream is marked as a high-priority trigger signal. When the AC operation results in rejecting the external resource request, the multicast replication module 523 sends a trigger signal for stopping the multicast replication. Accordingly, the multicast replication module 523 further receives the trigger signal. Local resource admission control function module 522 After the multicast stream is marked as a high-priority trigger signal, the multicast stream is marked as a high priority; after receiving the trigger signal for stopping the multicast replication sent by the local resource admission control function module 522, the multicast is stopped. copy.
组播协议处理模块 521还可以接收组播停止请求； 由本地资源接 纳控制功能模块 522进一步对组播停止请求进行 AC操作， 向组播复 制模块 523发送停止组播复制的触发信号，并释放从资源接纳控制设 备 53请求的外部资源。  The multicast protocol processing module 521 can also receive the multicast stop request. The local resource admission control function module 522 further performs an AC operation on the multicast stop request, and sends a trigger signal for stopping the multicast replication to the multicast replication module 523, and releases the slave signal. The resource accepts external resources requested by the control device 53.
本地资源接纳控制功能模块 522 进一步在接收到资源接纳控制 设备 53发送的外部资源请求时， 向组播复制模块 523发送停止组播 复制的触发信号， 并释放从资源接纳控制设备 53请求的外部资源。  The local resource admission control function module 522 further sends a trigger signal for stopping the multicast replication to the multicast replication module 523 when the external resource request sent by the resource admission control device 53 is received, and releases the external resource requested from the resource admission control device 53. .
由以上所述可以看出， 本发明实施例所提供的技术方案， 为组播 业务分配组播资源， 当网络设备对接收到的组播请求进行 AC操作， 确定组播资源不足时， 仍然为组播请求进行组播复制， 但将该组播复 制对应的组播流标记为低优先级， 以保证不影响该用户设备 51原有 业务的情况下， 尽量为用户提供组播业务。 可见， 本发明实施例提供 的技术方案中， 由网络设备 52控制分配的组播资源， 在进行组播频 道切换时， 不需要与资源接纳控制设备进行信息交互， 节省了频道切 换时信息交互的时间。  It can be seen from the above that the technical solution provided by the embodiment of the present invention allocates multicast resources for the multicast service. When the network device performs AC operation on the received multicast request and determines that the multicast resource is insufficient, it is still The multicast request is used for multicast replication. However, the multicast traffic corresponding to the multicast replication is marked as a low priority. To ensure that the original service of the user equipment 51 is not affected, the multicast service is provided to the user. It can be seen that, in the technical solution provided by the embodiment of the present invention, the network device 52 controls the allocated multicast resource, and does not need to perform information interaction with the resource admission control device when performing multicast channel switching, thereby saving information interaction during channel switching. time.
而且可以网络设备 53在确定自身的组播资源不足时， 进行低优 先级的组播复制， 从而在频道切换时， 可以实现组播快速频道切换， 又不会因为资源不足而造成新组播流影响原有的组播流。  Moreover, the network device 53 can perform low-priority multicast replication when determining that its own multicast resource is insufficient, so that when the channel is switched, the multicast fast channel switching can be implemented, and the new multicast stream is not caused by insufficient resources. Affect the original multicast stream.
同时，本发明实施例的技术方案由内置本地资源接纳控制功能的 网络设备控制分配的组播资源， 管理组播业务， 不需要向资源接纳控 制设备 53上报频道切换信息， 从而在大量用户进行频道切换时， 不 需要与资源接纳控制设备 53进行大量的信息交互， 减小了 AN实现 的复杂度； 而且能够在不影响其它业务流的情况下， 尽量满足用户要 求， 为用户提供组播业务； 在频道切换时不需要与资源接纳控制设备 交互就可以进行组播复制， 从而减小了切换延迟， 实现了组播频道的 快速切换。 本发明实施例提供的技术方案中， 网络设备 52为接收到的组播 请求进行组播资源 AC操作， 当确定组播资源不足时， 为组播请求进 行组播复制， 并将对应的组播流标记为低优先级； 进一步向资源接纳 控制设备 53请求外部资源， 当资源接纳控制设备 53资源足够， 接受 外部资源请求时， 将低优先级的组播复制重新标记为高优先级， 而只 有在资源接纳控制设备 53的资源也不足时， 才会拒绝组播请求。 因 此， 本发明实施例的方案实现了组播与单播资源的共享， 提高了资源 的利用率， 避免了资源浪费。 At the same time, the technical solution of the embodiment of the present invention controls the allocated multicast resource by the network device with the local resource admission control function, manages the multicast service, and does not need to report the channel switching information to the resource admission control device 53, thereby performing channel on a large number of users. During the handover, the resource admission control device 53 does not need to perform a large amount of information interaction, which reduces the complexity of the AN implementation; and can satisfy the user requirements and provide the multicast service for the user without affecting other service flows; In the channel switching, the multicast replication can be performed without interaction with the resource admission control device, thereby reducing the handover delay and realizing fast switching of the multicast channel. In the technical solution provided by the embodiment of the present invention, the network device 52 performs a multicast resource AC operation for the received multicast request, and when determining that the multicast resource is insufficient, performs multicast replication for the multicast request, and performs corresponding multicast. The flow is marked as a low priority; the external resource is further requested from the resource admission control device 53. When the resource admission control device 53 has sufficient resources to accept the external resource request, the low priority multicast replication is re-marked as a high priority, and only When the resource admission control device 53 has insufficient resources, the multicast request is rejected. Therefore, the solution of the embodiment of the present invention implements sharing of multicast and unicast resources, improves resource utilization, and avoids resource waste.
以上所述仅为本发明的较佳实施例而已，并非用于限定本发明的 保护范围。 凡在本发明的精神和原则之内， 所作的任何修改、 等同替 换、 改进等， 均应包含在本发明的保护范围之内。  The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

权利要求 Rights request
1、 一种组播接纳控制的方法， 其特征在于， 预先为组播业务设 置组播资源， 该方法包括： A multicast admission control method, characterized in that a multicast resource is set in advance for a multicast service, and the method includes:
网络设备接收组播请求，  The network device receives the multicast request,
为所述组播请求进行组播资源接纳控制操作，  Performing a multicast resource admission control operation for the multicast request,
当组播资源不足时， 仍然接纳该组播请求， 并将对应的组播流标 记为低优先级。  When the multicast resource is insufficient, the multicast request is still accepted, and the corresponding multicast stream is marked as a low priority.
2、 如权利要求 1所述的方法， 其特征在于， 该方法进一步包括： 网络设备向资源接纳控制设备发送外部资源请求；  2. The method according to claim 1, wherein the method further comprises: the network device transmitting an external resource request to the resource admission control device;
网络设备接收资源接纳控制设备返回的所述外部资源请求的响 应， 根据所述外部资源请求的响应中的接纳控制操作的结果， 将所述 组播流标记为高优先级， 或停止所述组播复制。  Receiving, by the network device, a response of the external resource request returned by the resource admission control device, marking the multicast flow as a high priority, or stopping the group according to a result of the admission control operation in the response of the external resource request Broadcast copy.
3、 如权利要求 1或 2所述的方法， 其特征在于， 所述为组播业 务预先设置组播资源进一步包括： 设置组播资源门限；  The method according to claim 1 or 2, wherein the pre-setting the multicast resource for the multicast service further comprises: setting a multicast resource threshold;
所述确定组播资源不足为：  The determining that the multicast resource is insufficient is:
当前被占用的组播资源与所述组播请求需要的组播资源之和高 于预先设置的组播资源门限时， 确定组播资源不足。  When the sum of the currently occupied multicast resource and the multicast resource required by the multicast request is higher than a preset multicast resource threshold, it is determined that the multicast resource is insufficient.
4、 如权利要求 2所述的方法， 其特征在于，  4. The method of claim 2, wherein
当资源接纳控制设备根据来自网络设备的外部资源请求，确定资 源足够时，所述网络设备接收资源接纳控制设备返回的所述外部资源 请求的响应， 所述外部资源请求的响应中的接纳控制操作结果为 接 纳所述外部资源请求； And when the resource admission control device determines that the resource is sufficient according to the external resource request from the network device, the network device receives a response of the external resource request returned by the resource admission control device, and the admission control operation in the response of the external resource request The result is The external resource request;
所述网络设备根据所述外部资源请求的响应中的接纳所述外部 资源请求， 执行将所述组播流标记为高优先级.的处理。  The network device performs a process of marking the multicast stream as a high priority according to the accepting the external resource request in the response of the external resource request.
5、 如权利要求 4所述的方法， 其特征在于， 该方法进一步包括： 当资源接纳控制设备根据来自网络设备的外部资源请求，确定资 源不足时，所述网络设备接收资源接纳控制设备返回的所述外部资源 请求的响应，所述外部资源请求的响应中的接纳控制操作结果为拒绝 所述外部资源请求，  The method according to claim 4, wherein the method further comprises: when the resource admission control device determines that the resource is insufficient according to the external resource request from the network device, the network device receives the return from the resource admission control device The response of the external resource request, the result of the admission control operation in the response of the external resource request is to reject the external resource request,
所述网络设备根据所述外部资源请求的响应中的拒绝所述外部 资源请求， 执行停止所述组播复制的处理。  And the network device performs a process of stopping the multicast replication according to the rejecting the external resource request in the response of the external resource request.
6、 如权利要求 2所述的方法， 其特征在于， 该方法进一步包括： 网络设备接收组播停止请求， 为所述组播停止请求停止组播复 制； 如果网络设备使用了向资源接纳控制设备请求的外部资源， 则全 部或部分释放向资源接纳控制设备请求的外部资源。  The method according to claim 2, wherein the method further comprises: the network device receiving the multicast stop request, stopping the multicast replication for the multicast stop request; if the network device uses the resource admission control device The external resource requested, in whole or in part, releases the external resource requested by the resource admission control device.
7、 如权利要求 4所述的方法， 其特征在于， 该方法进一步包括： 网络设备接收资源接纳控制设备发送的外部资源请求；  The method according to claim 4, wherein the method further comprises: receiving, by the network device, an external resource request sent by the resource admission control device;
网络设备停止组播复制，并释放向资源接纳控制设备请求的外部 资源。  The network device stops multicast replication and releases the external resources requested by the resource admission control device.
8、 一种网络设备， 其特征在于， 该网络设备包括组播协议处理 模块、 本地资源接纳控制功能模块和组播复制模块，  A network device, comprising: a multicast protocol processing module, a local resource admission control function module, and a multicast replication module,
所述组播协议处理模块， 用于接收并处理组播请求；  The multicast protocol processing module is configured to receive and process a multicast request;
所述本地资源接纳控制功能模块，用于为所述组播请求进行连接 接纳控制操作， 当确定资源不足时， 向所述组播复制模块发送进行低 优先级组播复制的触发信号； The local resource admission control function module is configured to connect to the multicast request Receiving a control operation, when determining that the resource is insufficient, sending a trigger signal for performing low-priority multicast replication to the multicast replication module;
所述组播复制模块，用于在接收到所述本地资源接纳控制功能模 块发送的进行低优先级组播复制的触发信号后，将对应的组播流标记 为低优先级， 使得所述组播复制模块按标记的优先级执行组播复制。  The multicast replication module is configured to: after receiving the trigger signal for performing low-priority multicast replication sent by the local resource admission control function module, mark the corresponding multicast stream as a low priority, so that the group The broadcast replication module performs multicast replication at the marked priority.
9、 如权利要求 8所述的网络设备， 其特征在于， 所述本地资源 接纳控制功能模块进一步向接入资源接纳控制设备发送外部资源请 求； 接收资源接纳控制设备发送的接纳控制操作结果， 当所述接纳控 制操作结果为接受所述外部资源请求时 ,向所述组播复制模块发送将 所述组播流标记为高优先级的触发信号 , 当所述接纳控制操作结果为 拒绝所述外部资源请求时 ,向所述组播复制模块发送停止所述组播复 制的触发信号；  The network device according to claim 8, wherein the local resource admission control function module further sends an external resource request to the access resource admission control device; and receives an admission control operation result sent by the resource admission control device, when As a result of the admission control operation, when the external resource request is accepted, the triggering signal for marking the multicast stream as a high priority is sent to the multicast replication module, and the admission control operation results in rejecting the external Sending, by the resource replication module, a trigger signal for stopping the multicast replication to the multicast replication module;
所述组播复制模块，进一步在接收到所述本地资源接纳控制功能 模块发送的将所述组播流标记为高优先级的触发信号后，将所述组播 流标记为高优先级；在接收到所述本地资源接纳控制功能模块发送的 停止所述组播复制的触发信号后， 停止所述组播复制。  The multicast replication module further marks the multicast stream as a high priority after receiving the trigger signal sent by the local resource admission control function module to mark the multicast stream as a high priority; After receiving the trigger signal for stopping the multicast replication sent by the local resource admission control function module, stopping the multicast replication.
10、 如权利要求 9所述的设备， 其特征在于  10. Apparatus according to claim 9 wherein
所述组播协议处理模块进一步接收组播停止请求；  The multicast protocol processing module further receives a multicast stop request;
所述本地资源接纳控制功能模块，进一步对所述组播停止请求进 行接纳控制操作， 向所述组播复制模块发送停止组播复制的触发信 号， 并释放从资源接纳控制设备请求的外部资源。  And the local resource admission control function module further performs an admission control operation on the multicast stop request, sends a trigger signal for stopping the multicast replication to the multicast replication module, and releases the external resource requested from the resource admission control device.
11、 如权利要求 10所述的设备， 其特征在于， 所述本地资源接 纳控制功能模块进一步在接收到资源接纳控制设备发送的外部资源 请求时， 向所述组播复制模块发送停止组播复制的触发信号， 并释放 从资源接纳控制设备请求的外部资源。 The device according to claim 10, wherein the local resource is connected When receiving the external resource request sent by the resource admission control device, the nano control function module sends a trigger signal for stopping the multicast replication to the multicast replication module, and releases the external resource requested from the resource admission control device.
12、 一种组播接纳控制的***， 其特征在于， 该***包括用户设 备和网络设备，  12. A system for multicast admission control, characterized in that the system comprises user equipment and network equipment.
所述用户设备， 用于向网络设备发送组播请求； 接收网络设备进 行组播复制对应的组播流；  The user equipment is configured to send a multicast request to the network device; and receive, by the network device, a multicast stream corresponding to the multicast replication;
所述网络设备， 用于接收组播请求， 为所述组播请求进行组播资 源接纳控制操作， 当确定组播资源不足时， 仍然接纳该组播请求并将 对应的组播流标记为氏优先级。  The network device is configured to receive a multicast request, perform a multicast resource admission control operation for the multicast request, and when determining that the multicast resource is insufficient, still accept the multicast request and mark the corresponding multicast flow as priority.
13、 如权利要求 12所述的***， 其特征在于， 该***进一步包 括资源接纳控制设备，  13. The system of claim 12, wherein the system further comprises a resource admission control device,
所述网络设备进一步向资源接纳控制设备发送外部资源请求；根 据资源接纳控制设备对外部资源请求进行接纳控制操作的结果，将所 述组播流标记为高优先级， 或停止所述组播复制；  The network device further sends an external resource request to the resource admission control device; marking the multicast flow as a high priority or stopping the multicast replication according to a result of the resource admission control device performing an admission control operation on the external resource request ;
所述资源接纳控制设备，用于对所述网络设备的外部资源请求进 行接纳控制操作， 并将操作结果发送到所述网络设备。  And the resource admission control device is configured to perform an admission control operation on the external resource request of the network device, and send the operation result to the network device.
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