WO2009026846A1 - Procédé, dispositif et système de transmission de messages permettant la mise en oeuvre de services de multidiffusion - Google Patents

Procédé, dispositif et système de transmission de messages permettant la mise en oeuvre de services de multidiffusion Download PDF

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Publication number
WO2009026846A1
WO2009026846A1 PCT/CN2008/072118 CN2008072118W WO2009026846A1 WO 2009026846 A1 WO2009026846 A1 WO 2009026846A1 CN 2008072118 W CN2008072118 W CN 2008072118W WO 2009026846 A1 WO2009026846 A1 WO 2009026846A1
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WIPO (PCT)
Prior art keywords
multicast
multicast data
data indicated
network location
location identifier
Prior art date
Application number
PCT/CN2008/072118
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English (en)
French (fr)
Inventor
Ruobin Zheng
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP08784108A priority Critical patent/EP2164203A4/en
Publication of WO2009026846A1 publication Critical patent/WO2009026846A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854Wide area networks, e.g. public data networks
    • H04L12/2856Access arrangements, e.g. Internet access
    • H04L12/2869Operational details of access network equipments
    • H04L12/287Remote access server, e.g. BRAS
    • H04L12/2874Processing of data for distribution to the subscribers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854Wide area networks, e.g. public data networks
    • H04L12/2856Access arrangements, e.g. Internet access
    • H04L12/2869Operational details of access network equipments
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854Wide area networks, e.g. public data networks
    • H04L12/2856Access arrangements, e.g. Internet access
    • H04L12/2869Operational details of access network equipments
    • H04L12/2878Access multiplexer, e.g. DSLAM
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/09Mapping addresses
    • H04L61/25Mapping addresses of the same type
    • H04L61/2503Translation of Internet protocol [IP] addresses
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/50Address allocation
    • H04L61/5069Address allocation for group communication, multicast communication or broadcast communication

Definitions

  • the embodiments of the present invention relate to the field of multicast technologies for network communications, and in particular, to a method, device, and system for implementing multicast services. Background technique
  • Multicast The so-called multicast, that is, the network side requests the user-side user requesting the same data in a multicast group.
  • the users in the multicast group are also called multicast group members.
  • the sender of the network-side multicast data that is, the multicast source. You only need to send multicast data to the multicast group once, and then forward the multicast data to the multicast group members through multicast forwarding and replication.
  • the multicast technology needs to establish a unicast technology to the user's link, which can reduce the load of the network.
  • the data is sent to the user's broadcast technology, which can reduce network resources. Waste.
  • the implementation of multicast technology can effectively support the batch transmission of data.
  • the IP address can be used to indicate the network location identifier of the multicast source or the multicast group.
  • the IP address used to indicate the network location where the multicast source resides is the multicast source address.
  • the IP address of the network location where the group is located is the multicast address. If users want to carry out multicast services that transmit data through multicast technology, they need to join the multicast group corresponding to the multicast service. Therefore, each multicast address can correspond to multiple multicasts. Group member.
  • the mode of any source multicast ASM, Any Source Multicast
  • SSM source specific multicast
  • the ASM mode that is, the sender of the data on any network side, can be the multicast source of a specific multicast group.
  • the user only needs to obtain the multicast address in advance and join the multicast group to obtain one or more multicast sources.
  • the multicast data is sent without the need to know the multicast source address in advance.
  • the S SM mode provides the user with a way to select multicast data. That is, if the user is interested in the multicast data of a specific multicast source, the user can pre- The user is informed of the multicast source address, and then the user obtains the multicast data sent by the specific multicast source by adding the corresponding multicast group.
  • a service provider (SP) that provides a multicast service such as a network service provider (ISP, Internet SP) may have more than one.
  • ISP network service provider
  • ISP Internet SP
  • FIG 1 different ISPs connect to the same access through IP edge nodes corresponding to the ISP, such as Broadband Network Gateway (BNG) or Broadband Remote Access Server (BRAS).
  • BNG Broadband Network Gateway
  • BRAS Broadband Remote Access Server
  • L2CP Layer 2 Control Protocol
  • each BNG and DSLAM is connected to the corresponding LNG connection of the BNG; each BNG is connected.
  • L2CP Layer 2 Control Protocol
  • ACL Access Control List
  • ACLs can include: Access Circuit Identifier (ACI), multicast address, multicast source address, and ACL attributes.
  • ACI Access Circuit Identifier
  • the user side can learn related access information through the ACL to carry out multicast services.
  • the ACI is unique, and the unique ACI is referred to as a physical ACI.
  • the ACL including the physical ACI is a physical ACL.
  • the physical ACI can also be called an Access Loop Identifier (ALI).
  • ALI Access Loop Identifier
  • the DSLAM transmits the packet related to the multicast service between the user side and the network side through the ACL. For example, the user requests to join a multicast through the IGMP.
  • the DSLAM will check whether the corresponding physical ACI of the local ACL is allowed to receive the multicast data of the multicast group requested by the user according to the physical ACI of the user's IGMP message. .
  • multiple ISPs are often provided with multiple IP addresses that can be managed by the ISP.
  • the multiple IP addresses can be assigned by the ISP as multicast addresses and multicast source addresses.
  • the multicast address can form a multicast address space
  • the multicast source address can form a multicast source address space.
  • ASM mode overlapping addresses are not allowed in the multicast address space between different ISPs.
  • the multicast source address space between ISPs is not allowed to overlap. That is, different ISPs are not allowed to manage the same IP address at the same time.
  • the user A is a member of the multicast group A corresponding to the multicast service provided by the ISP1
  • the user B is a member of the multicast group B corresponding to the multicast service provided by the ISP2, and the multicast address A of the multicast group A.
  • the multicast address A of the multicast group B is the same as the IP address of the multicast group B, then in the ASM mode, if the ISPA provides the multicast service A to the user A through the multicast group A in the downlink direction from the network side to the user side, User B of multicast group B also receives multicast service A, and user B does not expect to receive multicast service A.
  • ISP A charges user B unreasonably;
  • SSM mode if user A expects to receive multicast service A of multicast source A provided by ISP A in the uplink direction from the user side to the network side, user A requests multicast service A of multicast source A.
  • the multicast source address of ISP A is the same as the multicast source address of multicast source B of ISP B, then after receiving the request from user A, the network side will not know how to handle the request, or may connect and Is not the group provided by multicast source B as expected by user A.
  • Business B ,.
  • the multicast or multicast source network address space managed by different SPs does not allow overlapping areas, it is inconvenient for the SP to use or coordinate the planning of the multicast address space or the multicast source address space.
  • the multicast service will be affected, making it difficult for the SP to accurately transmit the multicast data to the desired user, or This makes it difficult for users to request multicast data from the desired SP, and cannot easily and efficiently support the multicast wholesale service, and may result in a poor user experience.
  • the embodiment of the invention provides a packet transmission method for implementing a multicast service, so that the multicast service related message sent by the access side to the SP side can be accurately transmitted to the expected destination.
  • a packet transmission method for implementing a multicast service includes:
  • the network location identifier of the multicast data indicated by the access side in the packet is converted into the network location identifier of the multicast data indicated by the access side in the identifier mapping information.
  • the packet converted by the identifier is sent to the SP side communication device corresponding to the network location identifier of the multicast data indicated by the SP side.
  • the embodiment of the invention further provides a packet transmission method for implementing a multicast service, so that
  • the multicast service related packets sent by the SP to the access side can be accurately transmitted to the desired destination.
  • a packet transmission method for implementing a multicast service includes:
  • the SP side marked in the message The network location identifier of the multicast data is converted into the network location identifier of the multicast data indicated by the access side in the mapping mapping information and the network location identifier of the multicast data indicated by the SP side;
  • the packet that is converted by the identifier is sent to the access side communication device corresponding to the network location identifier of the multicast data indicated by the access side.
  • the embodiment of the invention further provides a message transmission device for implementing a multicast service, so that
  • the multicast service related message transmitted between the SP side and the access side can be accurately transmitted to the desired destination.
  • a message transmission device for implementing a multicast service, comprising: a message receiving unit, a mapping unit, and a text sending unit;
  • a packet receiving unit configured to receive, by the access side, a packet carrying a network location identifier of the multicast data indicated by the access side;
  • mapping unit configured to convert, according to the preset mapping information, the network location identifier of the multicast data indicated by the access side in the packet received by the packet receiving unit into the identifier mapping information and the access side The network location identifier of the multicast data indicated by the service provider SP side of the service provider where the indicated multicast data is located;
  • a message sending unit configured to send the message processed by the mapping unit to the SP side communication device corresponding to the network location identifier of the multicast data indicated by the SP side; or, the message receiving unit, configured to receive the SP side The packet carrying the network location identifier of the multicast data indicated by the SP side is sent;
  • the mapping unit is configured to convert, according to the preset mapping relationship, the network location identifier of the multicast data indicated by the SP side in the packet received by the packet receiving unit into the identifier mapping information and the SP side identifier
  • the network location identifier of the multicast data is the network location identifier of the multicast data indicated by the access side where the mapping relationship exists;
  • the embodiment of the present invention further provides a message transmission system for implementing a multicast service, including: a message transmission device that implements a multicast service, an access-side communication device, and an SP-side communication device;
  • the transmission device includes: a message receiving unit, a mapping unit, and a text sending unit;
  • the receiving unit of the temple is configured to receive a packet sent by the access side and carrying the network location identifier of the multicast data indicated by the access side;
  • mapping unit configured to convert, according to the preset mapping information, the network location identifier of the multicast data indicated by the access side in the packet received by the packet receiving unit into the identifier mapping information and the access side The network location identifier of the multicast data indicated by the service provider SP side of the service provider where the indicated multicast data is located;
  • the sending unit is configured to send the message processed by the mapping unit to the SP side communication device corresponding to the network location identifier of the multicast data indicated by the SP side.
  • the embodiment of the present invention further provides a multicast service.
  • the message transmission system includes: a message transmission device for implementing a multicast service, an access side communication device, and an SP side communication device; wherein the message transmission device for implementing the multicast service includes: a message receiving unit, a mapping unit, and a message Sending unit; wherein
  • a packet receiving unit configured to receive a packet sent by the SP side and carrying a network location identifier of the multicast data indicated by the SP side;
  • mapping unit configured to convert, according to the preset mapping information, the network location identifier of the multicast data indicated by the SP side in the packet received by the packet receiving unit into the identifier mapping information and the SP side identifier
  • the network location identifier of the multicast data is the network location identifier of the multicast data indicated by the access side where the mapping relationship exists;
  • the message sending unit is configured to send the message processed by the mapping unit to the access side communication device corresponding to the network location identifier of the multicast data indicated by the access side.
  • the foregoing packet transmission scheme for implementing the multicast service provided by the embodiment of the present invention is divided by the access side and the SP side. Do not indicate the network location identifier of the same multicast data, and pre-set the access side and
  • the mapping relationship between the network location identifier of the multicast data indicated by the access side and the network location identifier of the multicast data indicated by the SP side in the identifier mapping information may be utilized on the access side.
  • the multicast service-related packets transmitted between the SPs are accurately transmitted to the desired destination, improving the user experience.
  • the network location identifier of the multicast data indicated by the access side and the multicast indicated by the SP side may be The network location identifier of the data is isolated.
  • the SP can manage the IP address used to indicate the multicast data multicast address or the multicast source address. Even if different SPs use the same IP address to identify the network location where different multicast data resides.
  • the access side uses its own identification to identify the network location where the multicast data resides. Therefore, the access side can also distinguish the network location of the relevant multicast data on the SP side.
  • An IP address space used as a multicast address or a multicast source address managed by different SPs is allowed to overlap. This facilitates the SP to manage the IP address used as the network location identifier of the multicast data.
  • FIG. 1 is a scenario diagram of a conventional multicast service provided by multiple ISPs
  • FIG. 2 is a schematic diagram of a network location of an L2CP proxy according to an embodiment of the present invention
  • FIG. 3 is a flow chart of a packet transmission method for implementing a multicast service according to an embodiment of the present invention
  • FIG. 4 is a flowchart of another method for transmitting a packet for implementing a multicast service according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a message transmission apparatus for implementing a multicast service according to an embodiment of the present invention
  • FIG. 7 is a flow chart of a multicast control agent forwarding a message from an AN according to Embodiment 2 of the present invention.
  • FIG. 8 is a schematic structural diagram of a message transmission system for implementing a multicast service according to an embodiment of the present invention.
  • FIG. 9 is another schematic structural diagram of a message transmission system for implementing a multicast service according to an embodiment of the present invention.
  • FIG. 10 is still another schematic structural diagram of a message transmission system for implementing a multicast service according to an embodiment of the present invention. detailed description
  • the network locations of the originally different multicast groups are identified by the same multicast address, which is different.
  • the network location of the multicast source is identified by the same multicast source address. Therefore, it is difficult for the SP and the user to use the same network location identifier, such as the above multicast address or multicast source address, to identify different multicast groups or The multicast source, therefore, makes it difficult to accurately transmit messages such as signaling, messages, multicast data, etc. to the desired destination.
  • the related message transmitted between the SP and the user when the multicast service is carried out can be accurately transmitted to the desired destination, and a message transmission device for implementing the multicast service is set between the AN and the IP edge node.
  • the device may be referred to as a multicast control agent, and the multicast control agent has the capability to accurately transmit related messages to be transmitted by the SP or the user for conducting the multicast service to the desired destination.
  • the multicast control agent can be placed in an existing L2CP proxy (L2CP Proxy).
  • FIG. 2 is a schematic diagram of a network location where an L2CP proxy is located in an embodiment of the present invention.
  • the side where the AN can be connected to the L2CP agent is the access side
  • the side where the IP edge node is connected to the L2CP proxy is the SP side.
  • the network location of the same multicast data may be separately identified by the access side and the SP side, and the identifier mapping information may be set in advance, that is, the network location of the multicast data indicated by the access side.
  • the mapping relationship between the identifier and the network location identifier of the multicast data indicated by the SP side is determined.
  • the access side or the SP side can accurately know the identifier of the network location identifier of the multicast data.
  • the multicast control agent can use the network location identifier of the multicast data indicated by the access side, the network location identifier of the multicast data indicated by the SP side, and the mapping between the two identifiers. Relationship: The multicast service related message transmitted between the access side and the SP side is accurately transmitted to the desired destination.
  • the access side uses different IP addresses to identify the network location where different multicast data is located, and the same SP on the SP side also uses different IP addresses to identify different multicast data.
  • the location of the network that is, an SP on the access side or the SP side is a network location where different multicast data can be identified.
  • Different multicast groups are assigned different multicast addresses, and different multicast sources are allocated differently. Multicast source address.
  • the network location identifier of the multicast data indicated by the access side may include: a multicast address of the multicast data indicated by the access side, and/or the identifier indicated by the access side
  • the network location identifier of the multicast data indicated by the SP side may include: the multicast address of the multicast group where the multicast data is located on the SP side, and/or the SP side
  • the identifier mapping information may include: between the multicast address where the multicast data indicated by the access side is located and the multicast address where the multicast data indicated by the SP side is located Mapping relationship; and/or mapping relationship between the multicast source address of the multicast data indicated by the access side and the multicast source address of the multicast data indicated by the SP side.
  • the multicast address or multicast source address of the multicast data indicated by the access side may be associated with the multicast address or the multicast source address of the multicast data and the mapping relationship between the access side and the SP side.
  • the multicast address or multicast source address of the multicast data marked on the SP side is isolated.
  • the SP can manage the IP address used to indicate the multicast data multicast address or multicast source address, and the access side uses Seen on the access side
  • An IP address identifies a network location where the multicast data is located.
  • an SP on the SP side also uses the unique IP address that appears to the SP to identify the network location where the multicast data resides, and because the access side and the access side There is a mapping relationship between the SPs.
  • the multicast control agent can find the group indicated by the SP side corresponding to the network location identifier of the multicast data indicated by the access side.
  • the network location identifier of the broadcast data is also located, and the network location identifier of the multicast data indicated by the access side corresponding to the network location identifier of the multicast data indicated by the SP side can also be found.
  • the embodiment of the present invention sets the corresponding identifier mapping information between the access side and each SP. Therefore, even if different SPs on the SP side use the same IP address to identify different multicast data.
  • the multicast control agent can also find the multicast indicated by the SP side corresponding to the network location identifier of the multicast data indicated by the access side through different identifier mapping information between the access side and the different SPs. The network location identifier of the data, and the network location identifier of the multicast data indicated by the access side corresponding to the network location identifier of the multicast data indicated by the SP side.
  • FIG. 3 is a flowchart of a packet transmission method for implementing a multicast service according to an embodiment of the present invention, where the process includes the following steps:
  • Step S301 The multicast control agent receives the packet sent by the access side and carries the network location identifier of the multicast data indicated by the access side.
  • Step S302 The multicast control agent converts, according to the preset mapping information, the network location identifier of the multicast data indicated by the access side in the packet into the identifier mapping information and the group indicated by the access side.
  • Step S303 The multicast control agent sends the packet that is marked and converted to the SP-side communication device of the network location identifier of the multicast data indicated by the SP side.
  • the SP side communication device may be an IP edge node such as BNG or BRAS. Accordingly, referring to FIG. 4, FIG. 4 is another implementation of the multicast industry in the embodiment of the present invention.
  • the flow of the packet transmission method includes the following steps: Step S401: The multicast control agent receives the packet sent by the SP side and carries the network location identifier of the multicast data indicated by the SP side.
  • Step S402 The multicast control agent converts the network location identifier of the multicast data indicated by the SP side in the packet into the identifier data and the multicast data indicated by the SP side according to the identifier mapping information set in advance.
  • the network location identifier identifies the network location identifier of the multicast data indicated by the access side where the mapping relationship exists.
  • Step S403 The multicast control agent sends the packet that is marked and converted to the access side communication device corresponding to the network location identifier of the multicast data indicated by the access side.
  • the access side communication device can be an AN, such as a DSLAM.
  • FIG. 5 is a schematic structural diagram of a message transmission apparatus for implementing a multicast service according to an embodiment of the present invention.
  • the apparatus that is, the multicast control proxy, may include: a packet receiving unit 51, a mapping unit 52, and a message Transmitting unit 53; wherein
  • the message receiving unit 51 is configured to receive, by the access side, a packet carrying a network location identifier of the multicast data indicated by the access side;
  • the mapping unit 52 is configured to convert the network location identifier of the multicast data indicated by the access side in the packet received by the packet receiving unit 51 into the identifier mapping information and the connection according to the identifier mapping information set in advance.
  • the message sending unit 53 is configured to send the message processed by the mapping unit 52 to the SP side communication device corresponding to the network location identifier of the multicast data indicated by the SP side;
  • the message receiving unit 51 is configured to receive, by the SP side, a packet carrying a network location identifier of the multicast data indicated by the SP side;
  • the mapping unit 52 is configured to convert the network location identifier of the multicast data indicated by the SP side in the packet received by the packet receiving unit 51 into the identifier mapping information and the SP side according to the identifier mapping information set in advance.
  • the indicated multicast data is located
  • the network location identifier identifies the network location identifier of the multicast data indicated by the access side where the mapping relationship exists;
  • the message sending unit 53 is configured to send the message processed by the mapping unit 52 to the access side communication device corresponding to the network location identifier of the multicast data indicated by the access side.
  • the mapping unit 52 may include: an identification mapping information storage unit 521 and a conversion unit 522, where
  • the mapping mapping information storage unit 521 is configured to store a mapping relationship between a network location identifier of the multicast data indicated by the preset SP side and a network location identifier of the multicast data indicated by the access side;
  • the converting unit 522 is configured to convert the network location identifier of the multicast data indicated by the access side in the packet received by the packet receiving unit 51 into the SP by using the mapping information obtained from the identifier mapping information storage unit 521.
  • the network location identifier of the multicast data indicated by the side; or, the network location identifier of the multicast data indicated by the SP side in the packet received by the packet receiving unit 51 is converted into the multicast data indicated by the access side.
  • the location identifier of the network is configured to convert the network location identifier of the multicast data indicated by the access side in the packet received by the packet receiving unit 51 into the SP by using the mapping information obtained from the identifier mapping information storage unit 521.
  • the apparatus may further include: a configuration command receiving unit 54 configured to receive an identifier mapping information configuration command stored by the configuration identifier mapping information storage unit 521 sent by the SP side communication device.
  • the above SP side communication device may be the above IP edge node, such as BNG or BRAS; the access side communication device may be an access device, such as a DSLAM which can be used as an AN.
  • the ACL can be used to control the access port to be accessed.
  • the ACL can be used to control the binding of the multicast address or the multicast source address to the access line port where the access circuit identifier is located.
  • a physical ACL may be stored on the AN during specific implementation. The basic elements contained in this physical ACL can be found in Table 2.
  • an ACL can also be set on the multicast control agent.
  • the ACL is a logical ACL.
  • the setting of the logical ACL includes: configuring the identifier mapping information in the embodiment of the present invention in the logical ACL, and the multicast control proxy finds the corresponding identifier mapping information by viewing the table.
  • the multicast control agent may determine, according to the logical ACL, whether the multicast address is allowed to occupy the access of the access circuit identifier.
  • the line port if allowed, can further find the binding of the multicast address of the multicast data and the access line port indicated by the corresponding SP side in the logical ACL according to the mapping relationship. See Table 3, Table 3 is a list of the basic elements that the logical ACL can contain.
  • mapping information configured on the logical ACL, see Table 4.
  • the packet transmitted between the SP side and the access side may include: a control packet or a data packet; the control packet may include: a Layer 2 Control (L2C) message; a data packet It may include: an electronic program guide (EPG, Electronic Program Guide text or multicast data).
  • L2C Layer 2 Control
  • EPG Electronic Program Guide text or multicast data
  • a logical ACL corresponds to an SP.
  • the SP side can send a command to configure the logical ACL to the multicast control agent through the L2C message, and access and manage the logical ACL on the multicast control agent.
  • the command sent by the SP side can be configured by the multicast control agent. receive.
  • each logical ACL corresponds to a physical ACL in the AN
  • the logical ACL and the physical ACL may be a corresponding relationship or a many-to-one relationship. If a many-to-one relationship is adopted, the physical port of the AN may be saved. Resources, improve resource utilization of ports. If a logical ACL is in a many-to-one relationship with a physical ACL, multiple logical ACLs can be used to share the same physical ACL.
  • the identifier mapping information stored in the multicast control agent may be preset. One step explanation.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 6 is a flowchart of a packet that is forwarded by a multicast control proxy from an IP edge node according to Embodiment 1 of the present invention, where the process includes the following steps:
  • Step S601 The multicast control agent receives the packet from the IP edge node carrying the multicast address where the multicast data indicated by the SP side is located.
  • the multicast control agent processes the packet in the downlink direction from the SP side to the access side, and the message may be a downlink L2C message from the SP, or an EPG from the IPTV server or middleware. Packet or multicast data packet.
  • the L2CP proxy can configure the logical ACL of the corresponding SP as shown in Table 3 according to the downlink L2C message from the SP.
  • Step S602 The multicast control agent searches, in the local identifier mapping information storage unit, the multicast address of the multicast data indicated by the access side corresponding to the multicast address where the multicast data indicated by the SP side is located.
  • the mapping relationship between the multicast address of the multicast data indicated by the access side and the multicast address of the multicast data indicated by the SP side may be configured to correspond to the SP.
  • the multicast control agent can find the required mapping relationship from the logical ACL, and then find the required access side indication. The multicast address where the multicast data is located.
  • Step S603 The conversion unit of the multicast control agent converts the multicast address of the multicast data indicated by the SP side in the received packet to the multicast address of the multicast data indicated by the corresponding access side.
  • Step S604 The multicast control agent sends the multicast message to the multicast address translation.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 7 is a flowchart of a multicast control agent forwarding a message from an AN according to Embodiment 1 of the present invention, where the process may include the following steps:
  • Step S701 The multicast control agent receives a packet from the AN that carries the multicast address where the multicast data indicated by the access side is located.
  • the multicast control agent processes the data in the uplink direction from the access side to the SP side, and corresponds to the downlink L2C message that can be processed in the first embodiment.
  • the message may be an uplink L2C message from the access side to the SP side.
  • Step S702 The multicast control agent searches the local identifier mapping information storage unit for the multicast address of the multicast data indicated by the SP side corresponding to the multicast address where the multicast data indicated by the access side is located.
  • the mapping relationship between the multicast address of the multicast data indicated by the access side and the multicast address of the multicast data indicated by the SP side may be configured to correspond to the SP.
  • the multicast control agent can find the required mapping relationship from the logical ACL, and then find the multicast address of the multicast data indicated by the required SP side.
  • Step S703 The conversion unit of the multicast control agent converts the multicast address of the multicast data indicated by the access side in the received message to the multicast address of the multicast data indicated by the corresponding SP side.
  • Step S704 The multicast control agent sends the multicast address-converted packet to the IP edge node of the corresponding SP, and the process ends.
  • the network location identifier of the multicast data may also be the multicast source address identifier of the multicast data, or may carry the multicast address identifier of the multicast data and the multicast source address identifier of the multicast data.
  • FIG. 8 is a schematic structural diagram of the system.
  • the system may include: a message transmission device 81 that implements a multicast service, an access-side communication device 82, and an SP-side communication device 83; wherein, the message transmission device 81 that implements the multicast service is the above-mentioned L2CP proxy;
  • Device 82 may be an AN, such as a DSLAM; an SP-side communication device 83, such as BNG, BRAS.
  • Figure 2 may be an example of the message transmission system in which the L2CP agent containing the multicast control agent is set separately.
  • the L2CP agent can be combined with other communication devices.
  • FIG. 9 is another schematic structural diagram of the message transmission system, in which an L2CP proxy including a multicast control agent is combined with an AN.
  • FIG. 10 is another schematic structural diagram of the message transmission system, where the L2CP proxy including the multicast control agent is combined with the IP edge node.
  • the method, device, and system for transmitting a multicast service are provided by the access side and the SP side respectively, and the network location identifier of the same multicast data is respectively indicated, and the access side is preset.
  • the mapping between the network location identifier of the multicast data and the network location identifier of the multicast data indicated by the SP side, and the access side or the SP side may identify the network location where the multicast data is located.
  • the identifier is used to accurately know the destination of the identifier; on the other hand, the mapping relationship between the network location identifier of the multicast data indicated by the access side and the network location identifier of the multicast data indicated by the SP side may be utilized.
  • the multicast service-related packets transmitted between the access side and the SP side are accurately transmitted to the desired destination, improving the user experience.
  • the network location identifier of the multicast data indicated by the access side and the multicast data indicated by the SP side may be The network location identifier is isolated.
  • the SP can manage the IP address used to indicate the multicast data multicast address or the multicast source address. Even if different SPs use the same IP address to identify the network location where different multicast data resides, the access side sees The access side uses its own labeling method to identify the network location where the associated multicast data resides. Therefore, the access side can also distinguish the network location of the related multicast data pointed by the SP side, thereby allowing different SPs to be used for multicast management. There is an overlapping area in the IP address space of the address or multicast source address.
  • the present invention can be implemented by hardware or by software plus a necessary general hardware platform.
  • the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

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Description

实现组播业务的报文传输方法、 装置及系统 本申请要求于 2007 年 8 月 25 日提交中国专利局、 申请号为 200710147056.X, 发明名称为 "实现组播业务的 4艮文传输方法、 装置 及系统" 的中国专利申请的优先权, 其全部内容通过引用结合在本申 请中。 技术领域
本发明实施例涉及网络通信的组播技术领域,尤其涉及实现组播 业务的 4艮文传输方法、 装置及系统。 背景技术
宽带用户对服务需求的提升以及网络通信技术的不断发展, 推动了宽带网络中数据传输技术的发展, 使数据传输方式从传统 的单播 (Unicast ) 与广播 (Broadcast ) , 发展到了基于 IP网络的 组播( Multicast )。 所谓组播, 即网络侧将请求相同数据的用户侧 用户圈定在一个组播组中, 该组播组内的用户也称组播组成员; 网络侧组播数据的发送者, 即组播源只需发送一次组播数据到组 播组, 之后通过组播转发与复制, 即可将组播数据分发给组播组 成员。 组播技术相比较一次数据传输即需建立一条到用户的链路 的单播技术, 可减轻网络的负载; 相比较无论用户是否请求数据, 均将数据发送到用户的广播技术, 可减少网络资源的浪费。 组播 技术的实现可有效支持数据的批量发送。
在组播技术中 ,可用 IP地址作为标示组播源或组播组所在网络 位置标识, 其中, 称用于标示组播源所在网络位置的 IP地址为组播 源地址, 称用于标示组播组所在网络位置的 IP地址为组播地址。 用 户若希望开展通过组播技术传输数据的组播业务, 则首先需要加 入对应组播业务的组播组, 因此, 每个组播地址可对应多个组播 组成员。 组播技术中, 可釆用任意源组播 ( ASM , Any Source Multicast ) 与源特定组播 (SSM, Source Specific Multicast ) 的模 式, 传输组播数据。 其中, ASM模式, 即任意网络侧的数据发送 者都可以是某个特定组播组的组播源, 用户只需预先获得组播地 址, 加入该组播组以获得一个或多个组播源发送的组播数据, 而 并不需要预先获知组播源地址; S SM模式为用户多提供一种选择 组播数据的方式, 即用户若对特定组播源的组播数据感兴趣, 可 预先告知用户该组播源地址, 然后用户通过加入对应的组播组, 获得该特定组播源发送的组播数据。
通常, 提供组播业务的业务运营商 (SP, Service Provider ) , 如网络业务运营商 (ISP, Internet SP ) 可能不只一个, 现有由多 个 ISP提供组播业务的场景可参见图 1。图 1中,不同 ISP通过与该 ISP ——对应的 IP边缘节点, 如宽带网络网关 ( BNG , Broadband Network Gateway )或宽带接入服务器(BRAS, Broadband Remote Access Server )等, 连接到同一个接入节点 ( AN, Access Node ) , 如数字用户线接入复用器( DSLAM, Digital Subscriber Line Access Multiplexer ) 上。 其中, 每个 ISP与对应的 BNG之间通过层二控制 协议( L2CP, Level Two Control Protocol )连接;每个 BNG与 DSLAM 之间釆用与该 BNG——对应的 L2C连接相连;每个 BNG上都包含一 个 L2C功能单元, 该功能单元用于在 BNG上完成对 AN的层二控制 功能; 在 DSLAM上配置有一个组播权限控制表 ( ACL , Access Control List )。 参见表 1 , 表 1列出该 ACL可包含的基本元素。 ACL 可包括: 接入电路标识 (ACI, Access Circuit Identifier ) 、 组播地 址、 组播源地址、 ACL属性。 用户侧可通过该 ACL获知相关接入信 息, 以开展组播业务。 其中, ACI具有唯一性, 可称该具有唯一性 的 ACI为物理 ACI, 对应地, 称包含该物理 ACI的 ACL为物理 ACL。 通常物理 ACI也可称为接入环路标识 ( ALI , Access Loop Identifier ) 。 DSLAM通过上述 ACL将有关组播业务的报文在用户 侧与网络侧之间进行传输, 如用户通过 IGMP^艮文请求加入某组播 组, DSLAM会根据用户 IGMP报文所在的物理 ACI, 查看本地 ACL 上对应的物理 ACI是否允许接收用户请求的组播组组播的数据,若 允许可复制该组播组组播的数据给用户。
Figure imgf000005_0001
Figure imgf000005_0002
为使用户侧能够区分不同 ISP提供的组播业务,常为不同的 ISP 提供可供该 ISP管理的多个 IP地址, 该多个 IP地址可被 ISP分配作组 播地址, 组播源地址; 其中, 组播地址可构成一个组播地址空间, 组播源地址可构成一个组播源地址空间。 通常, ASM模式下, 不 同 ISP间的组播地址空间不允许存在重叠区域; SSM模式下, 不同
ISP间的组播源地址空间不允许存在重叠区域,即不同 ISP不允许同 时管理同一个 IP地址。
殳设用户 A是 ISP1所提供的组播业务对应的组播组 A的成员, 用户 B是 ISP2所提供的组播业务对应的组播组 B的成员, 若组播组 A的组播地址 A与组播组 B的组播地址 B是同一个 IP地址, 那么在 ASM模式下, 在网络侧到用户侧的下行方向上, 若 ISPA通过组播 组 A向用户 A提供组播业务 A, 则组播组 B的用户 B也会接收到组播 业务 A, 而用户 B并不期望接收组播业务 A, 从而导致用户 B的用户 体验较差, ISP A对用户 B收费也不合理; 而在 SSM模式下, 在用 户侧到网络侧的上行方向上, 若用户 A期望接收 ISP A提供的组播 源 A的组播业务 A,, 则用户 A会请求组播源 A的组播业务 A,, 但是 若 ISP A的组播源 A与 ISP B的组播源 B的组播源地址相同, 那么, 网络侧接收到用户 A所发出的请求后, 将不知如何处理该请求, 或 可能连接并不是用户 A所期望的组播源 B提供的组播业务 B,。
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:
现有实现组播业务的组播网络地址管理方案实现技术中, 一 方面, 由于不同 SP所管理的组播或组播源网络地址空间不允许存 在重叠区域, 因此, 使得给 SP使用或协调规划组播地址空间或组 播源地址空间带来不便; 另一方面, 如上文提及的, 若不同 SP所 管理的组播或组播源地址空间出现重叠区域, 则将影响组播业务 的开展, 使得 SP难以准确地将组播数据发送给所期望的用户, 或 使得用户难以向所期望的 SP请求组播数据, 不能很方便有效地支 持组播批发业务, 并可能导致较差的用户体验。
发明内容
本发明实施例提供一种实现组播业务的报文传输方法, 以实 现接入侧发送给 SP侧的组播业务相关报文能够被准确地传送到期 望目的地。
一种实现组播业务的报文传输方法, 包括:
接收接入侧发来的携带接入侧所标示的组播数据所在网络位 置标识的报文;
根据预先设置的标识映射信息, 将该报文中的接入侧所标示 的组播数据所在网络位置标识, 转换为标识映射信息中与该接入 侧所标示的组播数据所在网络位置标识存在映射关系的业务运营 商 SP侧所标示的组播数据所在网络位置标识;
将经过标识转换的报文发送给对应所述 SP侧所标示的组播数 据所在网络位置标识的 SP侧通信设备。
本发明实施例还提供一种实现组播业务的报文传输方法, 使
SP侧发送给接入侧的组播业务相关报文能够被准确地传送到期望 目的地。
一种实现组播业务的报文传输方法, 包括:
接收 SP侧发来的携带 SP侧所标示的组播数据所在网络位置 标识的 4艮文;
根据预先设置的标识映射信息, 将该报文中的 SP侧所标示的 组播数据所在网络位置标识, 转换为标识映射信息中与该 SP侧所 标示的组播数据所在网络位置标识存在映射关系的接入侧所标示 的组播数据所在网络位置标识;
将经过标识转换的报文发送给对应所述接入侧所标示的组播 数据所在网络位置标识的接入侧通信设备。
本发明实施例还提供一种实现组播业务的报文传输装置, 使
SP侧与接入侧之间传输的组播业务相关报文能够被准确地传送到 期望目的地。
一种实现组播业务的报文传输装置, 包括: 报文接收单元、 映射单元和 文发送单元; 其中,
报文接收单元, 用于接收接入侧发来的携带接入侧所标示的 组播数据所在网络位置标识的报文;
映射单元, 用于根据预先设置的标识映射信息, 将报文接收单元 接收到的报文中的接入侧所标示的组播数据所在网络位置标识, 转换为标识映射信息中与该接入侧所标示的组播数据所在网络位 置标识存在映射关系的业务运营商 SP侧所标示的组播数据所在网 络位置标识;
才艮文发送单元, 用于将经过映射单元处理的 文发送给对应 所述 SP侧所标示的组播数据所在网络位置标识的 SP侧通信设备; 或, 报文接收单元, 用于接收 SP侧发来的携带 SP侧所标示 的组播数据所在网络位置标识的报文;
映射单元, 用于根据预先设置的标识映射关系, 将报文接收 单元接收到的报文中的 SP 侧所标示的组播数据所在网络位置标 识, 转换为标识映射信息中与该 SP侧所标示的组播数据所在网络 位置标识存在映射关系的接入侧所标示的组播数据所在网络位置 标识;
才艮文发送单元, 用于将经过映射单元处理的 文发送给对应 所述接入侧所标示的组播数据所在网络位置标识的接入侧通信设 备。 本发明实施例还提供一种实现组播业务的报文传输系统, 包 括: 实现组播业务的报文传输装置、 接入侧通信设备和 SP侧通信 设备; 其中, 实现组播业务的报文传输装置包括: 报文接收单元、 映射单元和 文发送单元; 其中,
寺艮文接收单元, 用于接收接入侧发来的携带接入侧所标示的 组播数据所在网络位置标识的报文;
映射单元, 用于根据预先设置的标识映射信息, 将报文接收 单元接收到的报文中的接入侧所标示的组播数据所在网络位置标 识, 转换为标识映射信息中与该接入侧所标示的组播数据所在网 络位置标识存在映射关系的业务运营商 SP侧所标示的组播数据所 在网络位置标识;
才艮文发送单元, 用于将经过映射单元处理的 文发送给对应 所述 SP侧所标示的组播数据所在网络位置标识的 SP侧通信设备; 本发明实施例还提供一种实现组播业务的报文传输系统, 包 括: 实现组播业务的报文传输装置、 接入侧通信设备和 SP侧通信 设备; 其中, 实现组播业务的报文传输装置包括: 报文接收单元、 映射单元和 文发送单元; 其中,
报文接收单元, 用于接收 SP侧发来的携带 SP侧所标示的组 播数据所在网络位置标识的报文;
映射单元, 用于根据预先设置的标识映射信息, 将报文接收 单元接收到的报文中的 SP 侧所标示的组播数据所在网络位置标 识, 转换为标识映射信息中与该 SP侧所标示的组播数据所在网络 位置标识存在映射关系的接入侧所标示的组播数据所在网络位置 标识;
报文发送单元, 用于将经过映射单元处理的报文发送给对应 所述接入侧所标示的组播数据所在网络位置标识的接入侧通信设 备。
与现有技术相比, 本发明实施具有以下优点: 本发明实施例提 供的上述实现组播业务的报文传输方案, 通过由接入侧与 SP侧分 别标示同一组播数据所在网络位置标识, 以及预先设置接入侧与
SP侧分别标示的同一组播数据所在网络位置标识之间的标识映射 信息, 一方面可使接入侧或 SP侧通过自身对组播数据所在网络位 置标识的标识, 准确获知该标识所指目的地; 另一方面, 可利用 标识映射信息中接入侧所标示的组播数据所在网络位置标识与 SP 侧所标示的组播数据所在网络位置标识之间的映射关系, 将在接 入侧与 SP侧之间传输的组播业务相关报文准确地传送到期望目的 地, 提高用户体验。
并且, 通过在接入侧与 SP侧分别标示组播数据所在网络位置 标识, 以及相关标识映射信息, 可将接入侧所标示的组播数据所 在网络位置标识, 与 SP侧所标示的组播数据所在网络位置标识隔 离开, SP可自行管理用于标示组播数据组播地址或组播源地址的 IP地址, 即使不同 SP侧釆用相同的 IP地址来标识不同组播数据 所在网络位置, 在接入侧来看, 因接入侧釆用自身的标示方式来 标识相关组播数据所在网络位置, 因此, 接入侧也能够区分 SP侧 所指相关组播数据所在网络位置, 从而, 可允许不同 SP管理的用 作组播地址或组播源地址的 IP 地址空间存在重叠区域, 方便 SP 管理用作组播数据所在网络位置标识的 IP地址。 附图说明
图 1是现有由多个 ISP提供组播业务的场景图;
图 2是本发明实施例中 L2CP代理所处网络位置的示意图; 图 3 是本发明实施例中一种实现组播业务的报文传输方法流 程图;
图 4 是本发明实施例中另一种实现组播业务的报文传输方法 流程图;
图 5 是本发明实施例中实现组播业务的报文传输装置的结构 示意图;
图 6是本发明实施例一中组播控制代理转发来自 IP边缘节点 的报文的流程图;
图 7是本发明实施例二中组播控制代理转发来自 AN的报文的 流程图;
图 8 是本发明实施例中实现组播业务的报文传输系统的结构 示意图;
图 9 是本发明实施例中实现组播业务的报文传输系统另一个 结构示意图;
图 10是本发明实施例中实现组播业务的报文传输系统又一个 结构示意图。 具体实施方式
下面将结合附图对本发明实施例提供的技术方案作进一步详细 描述。
在出现不同 SP所管理的用作组播地址或组播源地址的 IP地 址空间出现重叠区域的情况下, 原本不相同的组播组所在网络位 置被用相同的组播地址标识, 原本不相同的组播源所在网络位置 被用相同的组播源地址标识, 因此, 使得 SP与用户难以利用相同 的网络位置标识, 如上述组播地址或组播源地址, 来识别不同的 组播组或组播源, 因而, 也就难以将如信令、 消息、 组播数据等 报文准确地传送到期望目的地。
本发明实施例为使开展组播业务时在 SP与用户间传输的相关 报文能够被准确地传送到期望目的地, 在 AN与 IP边缘节点之间 设置实现组播业务的报文传输装置, 具体实现时, 可称该装置为 组播控制代理, 该组播控制代理具有能够将 SP或用户为开展组播 业务所要传输的相关报文准确地传送到期望目的地的能力。 组播 控制代理可置于现有 L2CP代理(L2CP Proxy ) 中。
参见图 2, 图 2是本发明实施例中 L2CP代理所处网络位置的 示意图。 图 2中, 可称 AN与 L2CP代理相连的一侧为接入侧, 称 IP边缘节点与 L2CP代理相连的一侧为 SP侧。 本发明实施例中, 可由接入侧与 SP侧釆用各自的标示方式分别标识同一组播数据所 在网络位置, 且可预先设置标识映射信息, 即接入侧所标示的组 播数据所在网络位置标识与 SP侧所标示的该组播数据所在网络位 置标识之间的映射关系, 一方面可使接入侧或 SP侧通过自身对该 组播数据所在网络位置标识的标识, 准确获知该标识所指目的地; 另一方面, 可由组播控制代理利用接入侧所标示的组播数据所在 网络位置标识, 与 SP侧所标示的组播数据所在网络位置标识, 以 及两种标识之间的映射关系, 将在接入侧与 SP侧之间传输的组播 业务相关报文准确地传送到期望目的地。
需要说明的是, 本发明实施例中, 接入侧会釆用不同的 IP地 址来标识不同组播数据所在网络位置, SP侧同一个 SP也会釆用不 同的 IP 地址来标识不同组播数据所在网络位置, 即接入侧或 SP 侧的某个 SP为能够识别不同的组播数据所在网络位置, 会分别为 不同的组播组分配不同的组播地址, 为不同的组播源分配不同的 组播源地址。 相应地, 本发明实施例中, 接入侧所标示的组播数 据所在网络位置标识可包括: 接入侧所标示的该组播数据所在组 播地址, 和 /或接入侧所标示的该组播数据所在组播源地址; SP侧 所标示的该组播数据所在网络位置标识可包括: SP侧所标示的该 组播数据所在组播组的组播地址,和 /或 SP侧所标示的该组播数据 所在组播源的组播源地址; 标识映射信息可包括: 接入侧所标示 的组播数据所在组播地址与 SP侧所标示的组播数据所在组播地址 之间的映射关系; 和 /或, 接入侧所标示的组播数据所在组播源地 址与 SP侧所标示的组播数据所在组播源地址之间的映射关系。
通过在接入侧与 SP侧分别标示组播数据所在组播地址或组播 源地址, 以及上述映射关系, 可将接入侧所标示的组播数据所在 组播地址或组播源地址, 与 SP侧所标示的组播数据所在组播地址 或组播源地址隔离开, SP可自行管理用于标示组播数据组播地址 或组播源地址的 IP地址, 并且, 由于接入侧釆用在接入侧看来唯 一的 IP地址标识一个组播数据所在网络位置 , 对应地 , SP侧的某 个 SP也会釆用在该 SP看来唯一的 IP地址标识该组播数据所在网 络位置, 且由于接入侧与该 SP之间存在映射关系, 因此, 本发明 实施例中, 根据上述映射关系, 组播控制代理能够找到与接入侧 所标示的组播数据所在网络位置标识相对应的 SP侧所标示的组播 数据所在网络位置标识, 也能够找到与 SP侧所标示的组播数据所 在网络位置标识相对应的接入侧所标示的组播数据所在网络位置 标识。
而对于存在多个 SP的情况, 本发明实施例会在接入侧与每个 SP之间设置——对应的标识映射信息, 因此, 即使 SP侧不同 SP 釆用相同的 IP地址标识不同组播数据所在网络位置, 组播控制代 理也能够通过接入侧与不同 SP之间的不同标识映射信息, 找到与 接入侧所标示的组播数据所在网络位置标识相对应的 SP侧所标示 的组播数据所在网络位置标识, 也能够找到与 SP侧所标示的组播 数据所在网络位置标识相对应的接入侧所标示的组播数据所在网 络位置标识。
参见图 3 , 图 3是本发明实施例中一种实现组播业务的报文传 输方法流程图, 该流程包括以下步骤:
步骤 S301、 组播控制代理接收接入侧发来的携带接入侧所标 示的组播数据所在网络位置标识的报文。
步骤 S302、 组播控制代理根据预先设置的标识映射信息, 将 该报文中的接入侧所标示的组播数据所在网络位置标识, 转换为 标识映射信息中与该接入侧所标示的组播数据所在网络位置标识 存在映射关系的业务运营商 SP侧所标示的组播数据所在网络位置 标识。
步骤 S303、 组播控制代理将经过标识转换的报文发送给对应 SP侧所标示的组播数据所在网络位置标识的 SP侧通信设备。
该 SP侧通信设备可以是 IP边缘节点, 如 BNG或 BRAS。 相应地, 参见图 4 , 图 4是本发明实施例中另一种实现组播业 务的报文传输方法流程图, 该流程包括以下步骤: 步骤 S401、 组播控制代理接收 SP侧发来的携带 SP侧所标示 的组播数据所在网络位置标识的报文。
步骤 S402、 组播控制代理根据预先设置的标识映射信息, 将 该报文中的 SP侧所标示的组播数据所在网络位置标识, 转换为标 识映射信息中与该 SP侧所标示的组播数据所在网络位置标识存在 映射关系的接入侧所标示的组播数据所在网络位置标识。
步骤 S403、 组播控制代理将经过标识转换的报文发送给对应 所述接入侧所标示的组播数据所在网络位置标识的接入侧通信设 备。
该接入侧通信设备可以是 AN, 如 DSLAM。
参见图 5 , 图 5是本发明实施例中实现组播业务的报文传输装 置的结构示意图, 该装置即上述组播控制代理, 可包括: 报文接 收单元 51、 映射单元 52和^艮文发送单元 53 ; 其中,
报文接收单元 51 , 用于接收接入侧发来的携带接入侧所标示 的组播数据所在网络位置标识的报文;
映射单元 52 , 用于根据预先设置的标识映射信息, 将报文接 收单元 51接收到的报文中的接入侧所标示的组播数据所在网络位 置标识, 转换为标识映射信息中与该接入侧所标示的组播数据所 在网络位置标识存在映射关系的业务运营商 SP侧所标示的组播数 据所在网络位置标识;
报文发送单元 53 ,用于将经过映射单元 52处理的报文发送给 对应所述 SP侧所标示的组播数据所在网络位置标识的 SP侧通信 设备;
或, 报文接收单元 51 , 用于接收 SP侧发来的携带 SP侧所标 示的组播数据所在网络位置标识的报文;
映射单元 52 , 用于根据预先设置的标识映射信息, 将报文接 收单元 51接收到的报文中的 SP侧所标示的组播数据所在网络位 置标识, 转换为标识映射信息中与该 SP侧所标示的组播数据所在 网络位置标识存在映射关系的接入侧所标示的组播数据所在网络 位置标识;
报文发送单元 53 ,用于将经过映射单元 52处理的报文发送给 对应所述接入侧所标示的组播数据所在网络位置标识的接入侧通 信设备。
映射单元 52可包括: 标识映射信息存储单元 521和转换单元 522 , 其中,
标识映射信息存储单元 521 , 用于存储预先设置的 SP侧所标 示的组播数据所在网络位置标识与接入侧所标示的组播数据所在 网络位置标识之间的映射关系;
转换单元 522,用于利用从标识映射信息存储单元 521处获取 到映射信息, 将报文接收单元 51接收到的报文中的接入侧所标示 的组播数据所在网络位置标识, 转换为 SP侧所标示的组播数据所 在网络位置标识; 或, 将报文接收单元 51 接收到的报文中的 SP 侧所标示的组播数据所在网络位置标识转换为接入侧所标示的组 播数据所在网络位置标识。
该装置进一步可包括: 配置命令接收单元 54 , 用于接收 SP侧 通信设备发来的配置标识映射信息存储单元 521 存储的标识映射 信息配置命令。
上述 SP 侧通信设备可以是上述 IP 边缘节点, 如 BNG 或 BRAS;接入侧通信设备可以是接入设备,如可作为 AN的 DSLAM。
由于 ACL可用于对将要访问的接入端口进行权限控制, 在本 发明实施例中, 可用于控制组播地址或组播源地址, 与接入电路 标识所在接入线路端口的绑定, 因此, 本发明实施例中, 在具体 实现时, 可在 AN上存储一张物理 ACL。 该物理 ACL所包含的基本 元素可参见表 2。
表 2
Figure imgf000014_0001
224.x.y.z a.b.c.d >允许
ACI1
224.xl .yl .zl al .bl .cl .dl >不允许
ACI2
相应地, 在组播控制代理上, 也可设置 ACL, 为区别于 AN上 设置的物理 ACL, 可称该 ACL为逻辑 ACL。且设置该逻辑 ACL的作 用包括: 将本发明实施例中的标识映射信息配置在该逻辑 ACL中, 组播控制代理通过查看该表, 找到相应的标识映射信息。 相应地, 组播控制代理在收到用户请求加入如接入侧所标示的组播数据所 在组播地址后, 可根据该逻辑 ACL确定该组播地址是否允许占用 接入电路标识所在的接入线路端口, 若允许, 则可进一步根据上 述映射关系, 在该逻辑 ACL中找到对应的 SP侧所标示的该组播数 据所在组播地址与接入线路端口的绑定。 参见表 3 , 表 3是该逻辑 ACL可包含的基本元素列表。
表 3
Figure imgf000015_0001
逻辑 ACL上配置的标识映射信息可参见表 4。
表 4
Figure imgf000015_0002
本发明实施例中, SP侧与接入侧之间传输的报文可包括: 控 制报文或数据报文; 控制报文可包括: 层二控制(L2C , Level Two Control )消息; 数据报文可包括: 电子节目指南 ( EPG, Electronic Program Guide 文或组播数据 ^艮文。一个逻辑 ACL对应一个 SP, SP侧可通过 L2C消息向组播控制代理发送要求配置逻辑 ACL的 命令, 对组播控制代理上的逻辑 ACL进行访问与管理, SP侧发来 的该命令可由组播控制代理的配置命令接收单元接收。 另外, 每 个逻辑 ACL与 AN中的物理 ACL对应,逻辑 ACL与物理 ACL之 间可以是——对应关系, 也可以为多对一关系, 若采用多对一关 系, 则可节省 AN的物理端口资源, 提高端口的资源利用率。 若逻 辑 ACL与物理 ACL之间是多对一的关系, 则多个逻辑 ACL可以 分时复用同一物理 ACL,也可以釆用其他策略共享同一物理 ACL。 本发明实施例中, 保存在组播控制代理中的标识映射信息可预先 设置。 一步说明。
实施例一:
参见图 6,图 6是本发明实施例一中组播控制代理转发来自 IP 边缘节点的报文的流程图, 该流程包括以下步骤:
步骤 S601、 组播控制代理收到来自 IP边缘节点的携带 SP侧 所标示的组播数据所在组播地址的报文。
该实施例一中, 组播控制代理处理的是从 SP侧到接入侧的下 行方向上的报文, 该报文可以是来自 SP的下行 L2C消息, 或, 来 自 IPTV服务器或中间件的 EPG报文或组播数据报文。 L2CP代理 可根据来自 SP的下行 L2C消息, 配置相应 SP的如表 3所示的逻 辑 ACL。
步骤 S602、 组播控制代理在本地标识映射信息存储单元中查 找与该 SP侧所标示的组播数据所在组播地址相对应的接入侧所标 示的组播数据所在组播地址。
本实施例一中, 在具体实现时, 可将接入侧所标示的组播数 据所在组播地址与 SP侧所标示的该组播数据所在组播地址的映射 关系, 配置在与该 SP对应的逻辑 ACL上, 组播控制代理可从该 逻辑 ACL上找到所需的映射关系, 进而找到所需的接入侧所标示 的组播数据所在组播地址。
步骤 S603、 组播控制代理的转换单元将收到的报文中的 SP 侧所标示的组播数据所在组播地址, 转换为对应的接入侧所标示 的组播数据所在组播地址。
步骤 S604、 组播控制代理将经过组播地址转换的 4艮文发送给
AN, 该流程结束。
实施例二:
参见图 7 , 图 7 是本发明实施例一中组播控制代理转发来自 AN的·¾文的流程图, 该流程可包括以下步骤:
步骤 S701、 组播控制代理收到来自 AN的携带接入侧所标示 的组播数据所在组播地址的报文。
该实施例二中, 组播控制代理处理的是从接入侧到 SP侧的上 行方向上的 4艮文, 与上述实施例一中可处理的下行 L2C消息相对 应, 本实施例二中, 该^艮文可以是从接入侧到 SP侧的上行 L2C消 息。
步骤 S702、 组播控制代理在本地标识映射信息存储单元中查 找与该接入侧所标示的组播数据所在组播地址相对应的 SP侧所标 示的组播数据所在组播地址。
本实施例一中, 在具体实现时, 可将接入侧所标示的组播数 据所在组播地址与 SP侧所标示的该组播数据所在组播地址的映射 关系, 配置在与该 SP对应的逻辑 ACL上, 组播控制代理可从该 逻辑 ACL上找到所需的映射关系, 进而找到所需的 SP侧所标示 的组播数据所在组播地址。
步骤 S703、 组播控制代理的转换单元将收到的报文中的接入 侧所标示的组播数据所在组播地址, 转换为对应的 SP侧所标示的 组播数据所在组播地址。
步骤 S704、 组播控制代理将经过组播地址转换的报文发送给 对应的 SP侧的 IP边缘节点 , 该流程结束。
上述实施例一和二中, 报文所携带的接入侧或 SP侧所标示的 组播数据所在网络位置标识也可以是组播数据所在组播源地址标 识, 或者可以既携带组播数据所在组播地址标识, 又携带组播数 据所在组播源地址标识。
本发明实施例还提供一种实现组播业务的报文传输系统, 参 见图 8 , 图 8是该系统的结构示意图。 该系统可包括: 实现组播业 务的报文传输装置 81、 接入侧通信设备 82和 SP侧通信设备 83 ; 其中, 实现组播业务的报文传输装置 81即上述 L2CP代理; 接入 侧通信设备 82可以是 AN,如 DSLAM; SP侧通信设备 83 ,如 BNG、 BRAS。
图 2 可以是该报文传输系统的一个实例, 其中, 包含组播控 制代理的 L2CP代理被单独设置。 实际应用中, 可将 L2CP代理与 其他通信设备进行合设。
参见图 9 , 图 9是该报文传输系统另一个结构示意图, 其中, 包含组播控制代理的 L2CP代理与 AN合设。 参见图 10 , 图 10是 该报文传输系统又一个结构示意图, 其中, 包含组播控制代理的 L2CP代理与 IP边缘节点合设。
综上所述, 本发明实施例提供的实现组播业务的报文传输方 法、 装置及系统, 通过由接入侧与 SP侧分别标示同一组播数据所 在网络位置标识, 以及预先设置接入侧所标示的组播数据所在网 络位置标识与 SP侧所标示的组播数据所在网络位置标识之间的映 射关系, 一方面可使接入侧或 SP侧通过自身对组播数据所在网络 位置标识的标识, 准确获知该标识所指目的地; 另一方面, 可利 用接入侧所标示的组播数据所在网络位置标识与 SP侧所标示的组 播数据所在网络位置标识之间的映射关系, 将在接入侧与 SP侧之 间传输的组播业务相关报文准确地传送到期望目的地, 提高用户 体验。
并且, 通过在接入侧与 SP侧分别标示组播数据所在网络位置 标识, 以及上述映射关系, 可将接入侧所标示的组播数据所在网 络位置标识,与 SP侧所标示的组播数据所在网络位置标识隔离开, SP 可自行管理用于标示组播数据组播地址或组播源地址的 IP 地 址, 即使不同 SP侧釆用相同的 IP地址来标识不同组播数据所在 网络位置, 在接入侧来看, 因接入侧采用自身的标示方式来标识 相关组播数据所在网络位置, 因此, 接入侧也能够区分 SP侧所指 相关组播数据所在网络位置, 从而, 可允许不同 SP管理的用作组 播地址或组播源地址的 IP地址空间存在重叠区域。
通过以上的实施方式的描述, 本领域的技术人员可以清楚地 了解到本发明可以通过硬件实现, 也可以借助软件加必要的通用 硬件平台的方式来实现。 基于这样的理解, 本发明的技术方案可 以以软件产品的形式体现出来, 该软件产品可以存储在一个非易 失性存储介质 (可以是 CD-ROM, U盘, 移动硬盘等) 中, 包括 若干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备等)执行本发明各个实施例所述的方法。
总之, 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。

Claims

权利要求
1、 一种实现组播业务的报文传输方法, 其特征在于, 包括: 接收接入侧发来的携带接入侧所标示的组播数据所在网络位 置标识的 4艮文;
根据预先设置的标识映射信息, 将该报文中的接入侧所标示 的组播数据所在网络位置标识, 转换为标识映射信息中与该接入 侧所标示的组播数据所在网络位置标识存在映射关系的业务运营 商 SP侧所标示的组播数据所在网络位置标识;
将经过标识转换的报文发送给对应所述 SP侧所标示的组播数 据所在网络位置标识的 SP侧通信设备。
2、 根据权利要求 1所述的方法, 其特征在于, 所述接入侧所 标示的组播数据所在网络位置标识为接入侧所标示的该组播数据 所在组播地址 ,和 /或接入侧所标示的该组播数据所在组播源地址; 所述 SP侧所标示的组播数据所在网络位置标识为 SP侧所标 示的该组播数据所在组播地址,和 /或 SP侧所标示的该组播数据所 在组播源地址;
所述标识映射信息包括: 接入侧所标示的该组播数据所在组 播地址与 SP 侧所标示的该组播数据所在组播地址之间的映射关 系 ,和 /或接入侧所标示的该组播数据所在组播源地址与 SP侧所标 示的该组播数据所在组播源地址之间的映射关系;
将所述接入侧所标示的组播数据所在网络位置标识转换为所 述 SP侧所标示的组播数据所在网络位置标识的步骤包括:
将接入侧所标示的组播数据所在组播地址转换为 SP侧所标示 的组播数据所在组播地址; 或, 将接入侧所标示的组播数据所在 组播源地址转换为 SP侧所标示的组播数据所在组播源地址。
3、 根据权利要求 1或 2所述的方法, 其特征在于, 所述报文 包括: 控制报文或数据报文;
所述控制报文包括: 层二控制 L2C消息; 所述数据报文包括:电子节目指南 EPG报文或组播数据报文。
4、 根据权利要求 1所述的方法, 其特征在于, 所述标识映射 信息被存储于由 SP侧发来的配置命令控制配置的访问权限表 ACL 中; 所述 ACL中进一步包括: 与 SP侧所标示的组播数据所在网 络位置标识存在绑定关系的接入电路标识信息。
5、 一种实现组播业务的报文传输方法, 其特征在于, 包括: 接收 SP侧发来的携带 SP侧所标示的组播数据所在网络位置标 识的 4艮文;
根据预先设置的标识映射信息, 将该报文中的 SP侧所标示的 组播数据所在网络位置标识, 转换为标识映射信息中与该 SP侧所 标示的组播数据所在网络位置标识存在映射关系的接入侧所标示 的组播数据所在网络位置标识;
将经过标识转换的报文发送给对应所述接入侧所标示的组播 数据所在网络位置标识的接入侧通信设备。
6、 根据权利要求 5所述的方法, 其特征在于, 所述接入侧所 标示的组播数据所在网络位置标识为接入侧所标示的该组播数据 所在组播地址 ,和 /或接入侧所标示的该组播数据所在组播源地址; 所述 SP侧所标示的组播数据所在网络位置标识为 SP侧所标 示的该组播数据所在组播地址,和 /或 SP侧所标示的该组播数据所 在组播源地址;
所述标识映射信息包括: 接入侧所标示的该组播数据所在组 播地址与 SP 侧所标示的该组播数据所在组播地址之间的映射关 系 ,和 /或接入侧所标示的该组播数据所在组播源地址与 SP侧所标 示的该组播数据所在组播源地址之间的映射关系;
将所述 SP侧所标示的组播数据所在网络位置标识转换为所述 接入侧所标示的组播数据所在网络位置标识的步骤包括:
将 SP侧所标示的组播数据所在组播地址转换为接入侧所标示 的组播数据所在组播地址; 或,
将 SP侧所标示的组播数据所在组播源地址转换为接入侧所标 示的组播数据所在组播源地址。
7、 根据权利要求 5或 6所述的方法, 其特征在于,
所述报文包括: 控制报文或数据报文;
所述控制报文包括: 层二控制 L2C消息;
所述数据 4艮文包括: EPG 文或组播数据 4艮文。
8、 根据权利要求 5所述的方法, 其特征在于, 所述标识映射 信息被存储于由 SP侧发来的配置命令控制配置的访问权限表 ACL 中; 所述 ACL中进一步包括: 与 SP侧所标示的组播数据所在网 络位置标识存在绑定关系的接入电路标识信息。
9、 一种实现组播业务的报文传输装置, 其特征在于, 包括: 才艮文接收单元、 映射单元和 文发送单元; 其中,
报文接收单元, 用于接收接入侧发来的携带接入侧所标示的 组播数据所在网络位置标识的报文;
映射单元, 用于根据预先设置的标识映射信息, 将报文接收 单元接收到的报文中的接入侧所标示的组播数据所在网络位置标 识, 转换为标识映射信息中与该接入侧所标示的组播数据所在网 络位置标识存在映射关系的业务运营商 SP侧所标示的组播数据所 在网络位置标识;
报文发送单元, 用于将经过映射单元处理的报文发送给对应 所述 SP侧所标示的组播数据所在网络位置标识的 SP侧通信设备; 或, 报文接收单元, 用于接收 SP侧发来的携带 SP侧所标示 的组播数据所在网络位置标识的报文;
映射单元, 用于根据预先设置的标识映射关系, 将报文接收 单元接收到的报文中的 SP 侧所标示的组播数据所在网络位置标 识, 转换为标识映射信息中与该 SP侧所标示的组播数据所在网络 位置标识存在映射关系的接入侧所标示的组播数据所在网络位置 标识;
报文发送单元, 用于将经过映射单元处理的报文发送给对应 所述接入侧所标示的组播数据所在网络位置标识的接入侧通信设 备。
10、 根据权利要求 9 所述的装置, 其特征在于, 所述映射单 元包括: 标识映射信息存储单元和转换单元, 其中,
标识映射信息存储单元, 用于存储预先设置标识映射信息中 SP侧所标示的组播数据所在网络位置标识与接入侧所标示的组播 数据所在网络位置标识之间的映射关系;
转换单元, 用于利用从标识映射信息存储单元处获取到标识 映射信息, 将报文接收单元接收到的报文中的接入侧所标示的组 播数据所在网络位置标识, 转换为 SP侧所标示的组播数据所在网 络位置标识; 或, 将报文接收单元接收到的报文中的 SP侧所标示 的组播数据所在网络位置标识转换为接入侧所标示的组播数据所 在网络位置标识。
11、 根据权利要求 9 所述的装置, 其特征在于, 所述装置进 一步包括: 配置命令接收单元, 用于接收 SP侧通信设备发来的配 置标识映射信息存储单元存储的标识映射信息配置命令。
12、 根据权利要求 9 所述的装置, 其特征在于, 所述装置设 置与层 2控制协议代理 L2CP Proxy上。
13、 一种实现组播业务的报文传输系统, 其特征在于, 包括: 实现组播业务的报文传输装置、接入侧通信设备和 SP侧通信设备; 其中,
实现组播业务的报文传输装置包括: 报文接收单元、 映射单 元和 文发送单元; 其中,
报文接收单元, 用于接收接入侧发来的携带接入侧所标示的 组播数据所在网络位置标识的报文;
映射单元, 用于根据预先设置的标识映射信息, 将报文接收 单元接收到的报文中的接入侧所标示的组播数据所在网络位置标 识, 转换为标识映射信息中与该接入侧所标示的组播数据所在网 络位置标识存在映射关系的业务运营商 SP侧所标示的组播数据所 在网络位置标识; 报文发送单元, 用于将经过映射单元处理的报文发送给对应 所述 SP侧所标示的组播数据所在网络位置标识的 SP侧通信设备。
14、 一种实现组播业务的报文传输系统, 其特征在于, 包括: 实现组播业务的报文传输装置、接入侧通信设备和 SP侧通信设备; 其中, 实现组播业务的报文传输装置包括: 报文接收单元、 映射 单元和 文发送单元; 其中,
报文接收单元, 用于接收 SP侧发来的携带 SP侧所标示的组 播数据所在网络位置标识的报文;
映射单元, 用于根据预先设置的标识映射信息, 将报文接收 单元接收到的报文中的 SP 侧所标示的组播数据所在网络位置标 识, 转换为标识映射信息中与该 SP侧所标示的组播数据所在网络 位置标识存在映射关系的接入侧所标示的组播数据所在网络位置 标识;
报文发送单元, 用于将经过映射单元处理的报文发送给对应 所述接入侧所标示的组播数据所在网络位置标识的接入侧通信设 备。
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