WO2007028325A1 - Systeme de multi-diffusion ip et procede utilisant le reseau mobile - Google Patents

Systeme de multi-diffusion ip et procede utilisant le reseau mobile Download PDF

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Publication number
WO2007028325A1
WO2007028325A1 PCT/CN2006/002272 CN2006002272W WO2007028325A1 WO 2007028325 A1 WO2007028325 A1 WO 2007028325A1 CN 2006002272 W CN2006002272 W CN 2006002272W WO 2007028325 A1 WO2007028325 A1 WO 2007028325A1
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WIPO (PCT)
Prior art keywords
data
proxy unit
base station
multicast
igmp
Prior art date
Application number
PCT/CN2006/002272
Other languages
English (en)
French (fr)
Inventor
Jian Chen
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 AT06775589T priority Critical patent/ATE536016T1/de
Priority to EP20060775589 priority patent/EP1915000B1/en
Priority to ES06775589T priority patent/ES2375497T3/es
Priority to JP2008529451A priority patent/JP4727728B2/ja
Priority to CNA2006800117926A priority patent/CN101156475A/zh
Publication of WO2007028325A1 publication Critical patent/WO2007028325A1/zh
Priority to US12/042,421 priority patent/US8411680B2/en

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Classifications

    • 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
    • H04L12/189Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • 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
    • H04L12/185Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/16Multipoint routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W40/00Communication routing or communication path finding
    • H04W40/24Connectivity information management, e.g. connectivity discovery or connectivity update

Definitions

  • the present invention relates to the field of communications, and in particular, to an IP multicast system and method based on a mobile network. Background technique
  • the first three require wireless networks to provide point-to-point transmission bearers, and the latter requires wireless networks to provide point-to-multipoint transmission bearers.
  • the Universal Mobile Telecommunication System (UMTS) network's 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) R99 and R4 versions of the protocol were not considered to carry point-to-multipoint services on the network, multimedia broadcasting
  • the multicast service is included in the R6 version protocol, and the corresponding functions of the access network and the core network of the R6 version protocol are increased to provide a point-to-multipoint transmission bearer.
  • a new Node Broadcast Multicast-Service Center is connected to the Gateway GPRS Support Node (GGSN), and the BM-SC implements a multimedia broadcast multicast service. Provisioning and control, enabling access control and charging for mobile terminals during multicast services.
  • the GGSN, the Serving GPRS Support Node (SGSN), the Radio Access Network (RAN), the user plane and the control plane of the mobile phone all add new functions to assist the BM-SC to provide point-to-multipoint services.
  • FIG. 1 it is a schematic diagram of a related network structure in a WCDMA network in the prior art.
  • the mobile TV function means that you can watch TV directly on your mobile phone, so that users can watch TV anytime and anywhere. The investigation shows that it is attractive to users.
  • This function is a kind of multimedia broadcast multicast service. It can be directly provided in the R6 product that has realized the multimedia broadcast multicast service, but the R6 version protocol has not yet been completed, and the mature product launch market takes a long time. .
  • the WCDMAR99 R4 protocol version of the product has been commercialized, providing peer-to-peer streaming live and on-demand services for each user. This makes the cost of providing the service very high, limiting the number of mobile TV users, resulting in expensive service and high commercial value. reduce.
  • WCDMA R5 protocol introduces high-speed downlink packet access (HSDPA, High Speed Downlink) on the RAN side Packet Access) greatly improves the ability of the RAN side to process data.
  • HSDPA High Speed Downlink
  • the 'B' of the '''3 sector will be able to process tens of megabytes of data.
  • multicast-based applications on the Internet, such as television.
  • IPTV Live broadcast
  • live video live video
  • Internet radio users will use more streaming media technology-based applications, at this time RAN will play a role as a high-performance data router based on the original functions, but for live broadcast Class application, currently RAN cannot support IP data multicast processing.
  • the mainstream mobile networks including WCDMA, CDMA2000, and GSM TD-SCDMA, are not particularly adequate for IP multicast support.
  • WCDMA Wideband Code Division Multiple Access
  • CDMA2000 Code Division Multiple Access 2000
  • GSM TD-SCDMA Global System for Mobile communications
  • WCDMA R6 Wideband Code Division Multiple Access
  • FIG. 2 it is the implementation process of the WCDMA R6 MBMS service.
  • the Internet Group Management Protocol (IGMP) sent by the terminal is directly sent to the GPRS Support Node (GGSN).
  • the GGSN initiates the control process of the entire MBMS service.
  • the whole change involves multiple network elements of WCDMA.
  • IP network With the continuous development of the IP network, a large number of IP multicast-based service sources such as IPTV will appear on the Internet network. At this time, it is difficult for the UE to transparently access these IP multicast data sources through R6 MBMS.
  • the streaming media service is transmitted point-to-point on the RAN side, and the transmission resources between the NodeB and the Radio Network Controller (RNC) are very limited.
  • RNC Radio Network Controller
  • the price of leased transmission resources is Very high, and for live streaming, due to the limited channel of the program, usually one operator only provides several live channels (such as several TV programs).
  • the current protocol version is The WCDMA network of R99, R4, and R5 does not implement IP multicast technology.
  • each interface of the WCDMA system needs to establish a dedicated channel for each user for each interface. The same data is sent multiple times. , resource utilization is low, and the number of users is limited.
  • the object of the present invention is to enable the RAN to support the IP multicast function through the RAN proxy technology in the mobile network, and at the same time enable the terminal to conveniently use various services based on IP multicast.
  • the system of the invention comprises:
  • a mobile network-based IP multicast system in which a terminal accesses a wireless network through a base station in an access network, the base station is connected to a core network through a wireless network base station controller, and the mobile network-based IP multicast system further includes :
  • the Internet Group Management Protocol IGMP proxy unit is located in the access network and is provided with multicast group information to which the terminal user belongs, receives the data sent by the multicast data source, and sends the data to the base station, where the data is sent by the base station. The minute is sent to the terminal.
  • the IGMP proxy unit includes:
  • High-level processing unit HPU IGMP proxy unit configured to receive data sent by the multicast data source, and distribute the data to the LPU IGMP proxy unit:
  • the LPU IGMP proxy unit is configured to receive a terminal request and send the data to the terminal.
  • the wireless network base station controller is configured with:
  • a signaling and control processing unit SACU for controlling the HPU IGMP proxy unit and the LPU IGMP proxy unit;
  • the HPU IGMP proxy unit, the LPU IGMP proxy unit, and the SACU communicate through the mobility group management protocol MGMP.
  • the IGMP proxy unit may be located in a radio network base station controller or may be located in a base station.
  • the IGMP proxy unit receives data sent by the multicast data source through the IP router.
  • the IGMP proxy unit receives the data through an IU-M interface.
  • the IGMP proxy unit and the multicast data source carry IP data through a physical transmission channel already existing between the radio network base station controller and the core network.
  • the IGMP proxy unit receives data sent by the multicast data source through the IU-PS interface.
  • a permanent virtual path is set between the IGMP proxy unit and the multicast data source for carrying IP data.
  • the data sent by the multicast data source is multicast data.
  • the data sent by the multicast data source is unicast data.
  • the IGMP proxy unit is provided with a unicast data-multicast data conversion unit, and the unicast is to be performed.
  • the data is converted to multicast data.
  • the base station is further provided with a multicast data distribution proxy unit for copying the multicast data, and transmitting the copied multicast data to the terminal.
  • a multicast data distribution proxy unit for copying the multicast data, and transmitting the copied multicast data to the terminal.
  • the method of the invention comprises:
  • the IGMP proxy unit sets the multicast group information to which the terminal user belongs.
  • IP data multicast the following steps are included:
  • the multicast data source sends data to the IGMP proxy unit.
  • the IGMP proxy unit receives the data, and sends the data to the base station;
  • the base station sends the data to the terminal.
  • the multicast data source sends the data to the IGMP proxy unit through an IP router.
  • the data sent by the multicast data source is multicast data.
  • the data sent by the multicast data source is unicast data.
  • the IGMP proxy unit converts the unicast data address into a multicast data address. Send to the base station.
  • the multicast data source sends the data to the IGMP proxy unit in a TCP/IP peer-to-peer manner.
  • the step of the base station copying the data is further included.
  • the base station replicates the data and is controlled by the radio network base station controller.
  • the base station copies the startup of the data, and includes the following steps:
  • the wireless network base station controller sends a start data distribution message to the base station
  • the base station sends a start data distribution confirmation message to the radio network base station controller.
  • the base station copies the stop of the data, and includes the following steps:
  • the wireless network base station controller sends a stop data distribution message to the base station
  • the base station transmits a stop data distribution confirmation message to the radio network base station controller.
  • the terminal sends an IGMP join request message to the IGMP proxy unit.
  • the IGMP proxy unit sends an MGMP join indication message to the radio network base station controller SACU;
  • the wireless network base station controller SACU sends an MGMP join confirmation message to the IGMP proxy unit;
  • the IGMP proxy unit sends an IGMP join confirmation message to the terminal.
  • the terminal applies to join the multicast group, the following steps are included:
  • the end user requests the multicast service from the LPU IGMP proxy unit;
  • the LPU IGMP proxy unit determines whether the multicast group exists, and if so, adds the terminal user to the multicast data forwarding table within the LPU; otherwise,
  • the LPU sends an IGMP join request to the HPU and establishes a forwarding table for the multicast group.
  • the LPU After the LPU determines that the end user is the last user of the multicast group, the LPU sends an IGMP Leave request to the HPU.
  • the terminal sends an IGMP Leave Request message to the IGMP proxy unit.
  • the IGMP proxy unit sends an MGMP leave indication message to the radio network base station controller SACU; the radio network base station controller SACU sends an MGMP leave confirmation message to the IGMP proxy unit;
  • the IGMP proxy unit sends an IGMP Leave Confirmation message to the terminal.
  • the SACU sends an IGMP Leave indication message to the source IGMP proxy unit.
  • the source IGMP proxy unit sends an IGMP leave confirmation message to the SACU;
  • the SACU sends an IGMP join request message to the target IGMP proxy unit;
  • the target IGMP proxy unit sends an IGMP join confirmation message to the SACU.
  • the source SACU sends an MGMP join request message to the target SACU;
  • the target SACU sends an MGMP join request message to the target IGMP proxy unit;
  • the target IGMP proxy unit sends an MGMP join confirmation message to the target SACU;
  • the target SACU sends an MGMP join confirmation message to the source SACU.
  • the source SACU sends an MGMP delete request message to the source IGMP proxy unit.
  • the source IGMP proxy unit sends an MGMP delete confirmation message to the source SACU.
  • the IGMP proxy unit includes an LPU IGMP proxy unit and an HPU IGMP proxy unit, and the terminal is connected to the HPU through the LPU.
  • an IGMP proxy unit is set in the access network, and the multicast data is sent to the base station through the IGMP proxy unit to complete the distribution of the multicast data, thereby saving network bandwidth. Since the IGMP proxy technology is adopted on the access network side, the IGMP-related processing is directly processed on the access network side, and the process processing speed is greatly accelerated, so that the user obviously feels the connection speed is accelerated.
  • the present invention further utilizes the mobility group management protocol MGMP, so that users can also receive multicast data during the mobile process.
  • the solution is well integrated with the mobile network, which simplifies the complexity of IP multicast in the mobile network, and makes the transmission of multicast data transparent to the core network, so that users can easily access all the multicasts in the current Internet. data source.
  • the scheme of the present invention adopts the bypass technology of multicast data, and the bearer of the multicast data is a dedicated channel, which greatly improves the quality of service of the multicast data (QOS Quality of Service).
  • the present invention provides a service that can greatly reduce operating costs, and in particular, saves transmission resources from the base station to the wireless network base station controller interface.
  • FIG. 1 is a schematic diagram of a network structure for providing a point-to-point service in the prior art
  • FIG. 3 is a schematic structural diagram of the present invention in a WCDMA network
  • FIG. 4 is another schematic structural diagram of the present invention in a WCDMA network
  • FIG. 5 is a schematic diagram of an IGMP proxy unit of the present invention and its connection in a network
  • FIG. 6 is a schematic diagram of transmitting unicast data according to the present invention.
  • FIG. 7 is a schematic diagram of unicast data forming multicast data according to the present invention.
  • FIG. 8 is a schematic diagram of the IGMP proxy unit distributing multicast data according to the present invention.
  • Figure 9 is a schematic flow chart of the present invention.
  • FIG. 10 is a schematic diagram of startup data distribution according to the present invention.
  • FIG. 11 is a schematic diagram of a specific process of starting data according to the present invention.
  • FIG. 13 is a schematic diagram of a specific process of closing data according to the present invention.
  • FIG. 14 is a schematic diagram of a multicast establishment process of the present invention.
  • 15 is a schematic diagram of a process for a terminal applying to join a multicast group according to the present invention.
  • 16 is a schematic diagram of a multicast release process according to the present invention.
  • FIG. 17 is a schematic diagram of a process of switching and updating a cell according to the present invention.
  • FIG. 18 is a schematic diagram of a handover process of a base station controller across a wireless network according to the present invention. detailed description
  • the RN can support the IP multicast function through the radio access network multicast proxy technology, so that the terminal can conveniently use various services based on IP multicast, and can be directly enriched with the current Internet network.
  • the multicast data resources establish a transparent channel to provide low-cost IP multicast-based streaming services for operators and ordinary users.
  • the mobile network involved in the present invention includes, but is not limited to, mobile networks such as WCDMA, CDMA2000, GSM, and TD-SCDMA.
  • WCDMA mobile networks
  • CDMA2000 Code Division Multiple Access 2000
  • GSM Global System for Mobile communications
  • TD-SCDMA Time Division Multiple Access 2000
  • FIG. 3 and FIG. 4 it is a schematic diagram of a WCDMA network structure according to the solution of the present invention.
  • the terminal of the present invention accesses a wireless network through a base station in the RAN, and the base station is connected to the core network through a base station controller of the wireless network.
  • the radio network base station controller may be a different network unit in different wireless networks, such as RNC in WCDMA and TD-SCDMA, and a base station controller (BSC) in GSM, in CDMA2000. CBSC.
  • the IGMP proxy unit is located in the RAN, and is configured with multicast group information to which the terminal user belongs, for receiving The multicast data sent by the multicast data source is sent to the base station, and the base station distributes the multicast data to the terminal.
  • IGMP Internet Group Management Protocol
  • the invention implements the hierarchical IGMP proxy function in the RAN, and simultaneously uses the bypass technology on the RAN side for the IP multicast user plane data, and adds an interface IU-M (IU-Multicast Interface) dedicated to processing the multicast data on the RAN side.
  • the interface, the multicast data can be directly obtained from the IP multicast router with multicast forwarding function, or the physical transmission channel between the RAN and the CN can be borrowed to carry IP multicast data, for example, on the IU-PS interface, alone.
  • Establish a permanent virtual path (PVC (IP0A)) of IP data carry IP multicast data, distribute it to the user plane of IP multicast data, and distribute the lowest layer to the base station (such as NodeB in WCDMA network) for distribution.
  • Multiple cells under one base station may simultaneously share a multicast data source between the base station and a wireless network base station controller interface (such as an IUB interface in a WCDMA network).
  • the user plane data sent to the terminal is divided into two parts.
  • the IP multicast data can no longer be forwarded through the CN, but bypassed through the IP multicast network.
  • the router that broadcasts the forwarding function is directly sent to the IGMP proxy unit in the RAN.
  • the other UE-oriented link-oriented TCP/IP data communicates with the multicast data source through the original path.
  • the logical channel carrying the multicast data can be independently networked, or can share a physical interface with the related network element in the mobile network. For example, in the WCDMA network, an ATM Over SDH is shared with the IU interface, and a multicast data carrying the multicast data is separately configured. PVC channel.
  • the bypassed multicast data can be directly bypassed by multicast, or the UDP (User Datagram Protocol) packet can be first unicasted by IP.
  • Network transfer to The RAN is then converted into multicast data by the multicast proxy on the RAN and transmitted to the UE.
  • This situation is very suitable for the initial stage of network construction, the IP transmission network supporting multicast transmission is immature, and the multicast carried by the mobile network Provide basic multicast service support for the terminal in a small number of services.
  • Converting unicast data into multicast data can be set by the network, and the IGMP proxy unit converts a unicast IP address into a specific multicast address, so that the IGMP proxy unit will check each one from the IU-M.
  • the data packet if its destination address is the IP address to be converted, is changed to the data of the specific IP multicast address. 'The above conversion of unicast packets into multicast packets is only an added function.
  • the data sent from the IU-M interface itself can be a multicast packet.
  • the present invention processes the processing of the IGMP multicast function in the mobile network from the CN to the RAN.
  • the IGMP proxy unit is placed in the RAN, and can be placed in the radio network base station controller or placed in the base station. in.
  • the IGMP proxy unit can be set in multiple levels. As shown in Figure 7, the two-level settings are used as an example. The settings of more than two levels are similar and will not be described in detail.
  • the two levels of setup include:
  • High-level processing unit HPU High Process Unit
  • An IGMP proxy unit that receives multicast data sent by a multicast data source and distributes the multicast data to an LPU IGMP proxy unit.
  • the IGMP proxy unit is used to receive a terminal request and send the multicast data to the terminal.
  • the implementation principle of the IGMP proxy unit inside the RAN is shown in FIG. 7.
  • the bold part in the figure is a new entity of the present invention, that is, the IGMP proxy unit is set in the radio network base station controller, and the IGMP message sent by the UE is directly in the wireless network.
  • the base station controller performs internal processing, and the radio network base station controller can also implement the hierarchical I.GMP proxy function internally.
  • the embodiment of the present invention is temporarily divided into two levels: a low-level processing unit LPU (Lower Process Unit), and high-level processing. Unit HPU (High Process Unit).
  • LPU Low-level processing unit
  • HPU High Process Unit
  • the IGMP proxy unit implemented in the LPU can be used as a multicast router to manage the following multicast user groups, thereby reducing the IGMP processing burden of the HPU and implementing distributed processing of the IGMP proxy unit.
  • the terminal user applies to join a certain group. If the multicast group is not in the LPU, the LPU sends an IGMP join request to the HPU and establishes a forwarding table for the multicast group. If the multicast group already exists in the LPU, the LPU is internal to the LPU. The end user is added to the multicast data forwarding table, and the LPU no longer sends an IGMP join request to the HPU.
  • the LPU When the terminal user requests to leave a multicast group, if the last terminal user of the multicast group, the LPU sends an IGMP Leave message to the HPU. If it is not the last terminal user, the IGMP Leave message is not sent to the HPU.
  • the HPU also has the corresponding feature.
  • the HPU receives the IGMP Leave message sent by the LPU, if it is the last terminal user of the multicast group, it sends an IGMP Leave message to the higher layer. If it is not the last end user. , then no IGMP Leave message is sent to the upper router. In the initial stage of network construction, because the mobile network carries less multicast services, it can directly utilize the hardware-based multicast function of the wireless network base station controller.
  • the hardware platform of the wireless network base station controller is based on ATM switching
  • the hardware platform of the wireless network base station controller is based on IP switching
  • the IP multicast switching function can be used to directly distribute data from the HPU to the LPU, and then the LPU determines whether to further distribute according to whether there is a user request.
  • the following takes the wireless network base station controller based on the ATM switching platform as an example to illustrate the multicast data distribution process.
  • the hardware-based ATM multicast function of the illustrated wireless network base station controller will simplify the distribution processing of the internal multicast data of the wireless network base station controller and provide a high quality of service (QOS) guarantee. .
  • QOS quality of service
  • the IGMP proxy unit needs to perform protocol interaction with the signaling and control unit (SACU) of the radio network base station controller to implement mobility of the terminal, and the protocol is mobility.
  • SACU signaling and control unit
  • MGMP Mobile Group Management Protocol
  • the MDDA Multicast Data Distribute Agent unit is a multicast data distribution agent, which is an optional unit, and the main purpose is to save the base station to the wireless network base station controller interface.
  • (IUB interface) bandwidth when multiple cells under one base station (NodeB) have the same multicast data transmission, only one copy needs to be transmitted from the base station to the wireless network base station controller interface (IUB interface), MDDA is responsible for It is copied into multiple copies and sent to the terminals receiving the multicast data on the air interface of multiple cells.
  • the present invention is based on the IP multicast method of the mobile network.
  • the IGMP proxy unit Based on the IGMP proxy unit, the IGMP proxy unit is set in the RAN, and the multicast group information to which the terminal belongs is set.
  • IP data multicast is performed, as shown in FIG. , including the following steps:
  • the multicast data source sends data to the IGMP proxy unit.
  • the multicast data source needs to send the multicast data to the terminal to the IGMP.
  • the data may be multicast data or unicast data. If it is unicast data, the unicast will be required in the IGMP proxy unit.
  • the data is converted to multicast data.
  • the multicast data source can send data to the IGMP proxy unit in two ways:
  • the IGMP proxy unit receives the data, and sends the data to the base station.
  • the IGMP proxy unit After receiving the data, the IGMP proxy unit performs conversion processing of the unicast data to the multicast data if it is unicast data, and can perform processing as shown in FIG. 7.
  • the IGMP proxy unit converts the unicast data address into a multicast data address, and then sends the multicast data to the base station; if it is multicast data, directly sends the data to the base station, The station distributes to terminals in different cells.
  • the base station distributes the data to the terminal.
  • the base station sends the multicast data to the terminal in the cell, so that the terminal can receive the multicast data and enjoy the corresponding service.
  • the step of the base station copying the data and the step of the base station to stop copying the data may be further included, where the process of copying the data by the base station is controlled by the radio network base station controller, and specifically includes:
  • the base station replicates the activation of the data, as shown in FIG. 10, including:
  • the wireless network base station controller sends a start data distribution message to the base station
  • the base station sends a start data distribution confirmation message to the radio network base station controller.
  • the radio network base station controller directly delivers the service data to the base station.
  • the NodeB MDDA first initiates an IGMP join message to the IP network transmission device. If the IP network transmission device does not have a corresponding multicast data source at this time, the IP network transmission device transmits the device to the upper-level IP network according to the IP multicast protocol. The IGMP join message is initiated until the IGMP join message is transmitted to the RNC. After receiving the IGMP join message, the RNC sends the corresponding multicast service data to the IP network transmission device according to the IP multicast protocol, and the RNC transmits the device to the IP network. The IGMP join confirmation message is sent, and the IP network transmission device transmits the IGMP join confirmation message to the base station step by step according to the IP multicast protocol. After receiving the IGMP join confirmation message, the base station sends a start data distribution acknowledgement message to the RNC through the existing signaling transmission channel. .
  • the base station copies the stop of the data, as shown in FIG. 12, including: ⁇ "'
  • the wireless network base station controller sends a stop data distribution message to the base station;
  • the base station transmits a stop data distribution confirmation message to the radio network base station controller.
  • the radio network base station controller directly stops delivering service data to the base station.
  • the scheme shown in FIG. 13 may be adopted:
  • the NodeB MDDA initiates an IGMP Leave message to the IP network transmission device. If the IP network transmission device does not have other NodeBs to receive the multicast data source at this time, the IP network transmission device transmits the IP network to the next level IP network according to the IP multicast protocol. The device initiates an IGMP Leave message until the IGMP Leave message is transmitted to the RNC. After receiving the IGMP Leave message, the RNC stops sending multicast service data to the IP network transport device, and the RNC transmits the data to the IP network. The device sends an IGMP leave confirmation message, and the IP network transmission device transmits the IGMP leave confirmation message to the base station step by step according to the IP multicast protocol. After receiving the IGMP leave confirmation message, the base station sends a stop data distribution confirmation to the RNC through the existing signaling transmission channel. Message.
  • the IGMP proxy unit can be hierarchically configured, for example, set to LPU and HPU, and the terminal accesses the mobile network-based IP multicast method according to the present invention through the LPU, including several intermediate processes, specifically:
  • the terminal sends an IGMP join request message to the IGMP proxy unit.
  • the S12JGMP proxy unit sends an MGMP join indication message to a signaling and control unit (SACU) of the radio network base station controller;
  • SACU signaling and control unit
  • the SACU sends an MGMP join confirmation message to the IGMP proxy unit.
  • the IGMP proxy unit sends an IGMP join confirmation message to the terminal.
  • the method includes the following steps: S21: The terminal applies for multicast service to the IGMP proxy unit.
  • step S22 LPU determines whether it has the multicast group, if yes, proceeds to step S23, otherwise, proceeds to step S24;
  • the LPU sends an IGMP join request to the HPU, and establishes a forwarding table for the multicast group.
  • the terminal sends an IGMP Leave Request message to the IGMP proxy unit.
  • the IGMP proxy unit sends an MGMP leave indication message to the SACU.
  • the SACU sends an MGMP leave confirmation message to the IGMP proxy unit.
  • the IGMP proxy unit sends an IGMP leave confirmation message to the terminal.
  • the LPU determines whether the end user is the last end user of the multicast group. If so, the LPU sends an IGMP Leave Request to the HPU.
  • the SACU sends an IGMP leave indication message to the source IGM? proxy unit.
  • the source IGMP proxy unit sends an IGMP leave confirmation message to the SACU.
  • the SACU sends an IGMP join request message to the target IGMP proxy unit.
  • the target IGMP proxy unit sends an IGMP join confirmation message to the SACU.
  • the source SACU sends an MGMP join request message to the target SACU.
  • the target SACU sends an MGMP join request message to the target IGMP proxy unit.
  • the target IGMP proxy unit sends an MGMP join confirmation message to the target SACU.
  • the target SACU sends an MGMP join confirmation message to the source SACU.
  • the source SACU sends an MGMP delete request message to the source IGMP proxy unit.
  • the source IGMP proxy unit sends an MGMP deletion confirmation message to the source SACU.
  • the RAN multicast proxy technology enables the RAN to support the IP multicast function and solve the mobility of the user, and utilizes the MGMP Mobile Group Management Protocol to enable the mobile user to Conveniently use various services based on IP multicast, and directly establish a transparent channel with the rich multicast data resources on the current Internet network to provide low-cost IP multicast-based streaming media services for operators and ordinary users. .

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Description

一种基于移动网络的 IP组播系统和方法 技术领域
本发明涉及通信领域, 尤其涉及一种基于移动网络的 IP组播系统和方法。 背景技术
随着手机等移动终端的集成度越来越高, 手机的信息处理能力也越来越强, 可以提供 一定分辨率与色彩的彩色屏幕、摄像头;随着新的无线接入网( RAN Radio Access Network ) 技术的出现, 可以提供足够宽的数据无线传输带宽。 在这种条件下, 与视频相关的各种应 用就很自然的出现在手机上 , 比如多媒体短消息业务、 分组交换 (PS, Packet Switch)域视频 流业务、 可视电话业务、 多媒体广播多播业务。
以上业务中 , 前三种需要无线网络提供点到点的传输承载 , 后一种需要无线网络提供 点到多点的传输承载。 通用移动通信系统 (UMTS, Universal Mobile Telecommunication System ) 网络的第三代合作工程( 3GPP, 3rd Generation Partnership Project ) R99及 R4版 本协议在制定的时候没有考虑在网络上承载点到多点业务,多媒体广播多播业务包含在 R6 版本协议中, 相应的对 R6版本协议的接入网和核心网的功能进行较多增加, 以提供点到 多点的传输承载。 在核心网外部增加新的节点广播多播-业务中心 (BM-SC, Broadcast Multicast- Service Center ) 与网关 GPRS支撑节点 ( GGSN, Gateway GPRS Support Node ) 相连, BM-SC实现对多媒体广播多播业务的提供和控制,在多播业务时实现对移动终端的 接入控制和计费。 GGSN、 服务 GPRS支撑节点 (SGSN, Serving GPRS Support Node )、 无 线接入网 ( RAN, Radio Access Network )、 手机的用户面和控制面都增加新的功能, 协助 BM-SC提供点到多点业务。 如图 1所示, 是现有技术中 WCDMA网络中的相关的网络结 构示意图。
手机电视功能是指可以直接在手机上收看电视, 使用户随时随地都可以看电视, 调查 表明对用户^ ^吸引力。 该功能是多媒体广播多播业务的一种, 在已经实现多媒体广播多 播业务的 R6产品中将可以直接提供,但 R6版本协议目前还没有制定完成,成熟的产品推 出市场也需要较长的时间。
WCDMAR99 R4协议版本的产品已经实现商用, 能够为每一个用户提供点对点流媒 体直播及点播服务, 这样使提供该业务的成本非常高, 限制手机电视的用户数目, 导致该 业务资费昂贵, 商业价值大大降低。
WCDMA R5协议在 RAN侧引入了高速下行分组接入 ( HSDPA, High Speed Downlink Packet Access ), 大幅度提高了 RAN侧处理数据的能力 ,'' '^ '3扇区的 NodeB , 将能处理 几十兆流量的数据, 同时目前 Internet网络有大量基于组播的应用, 如电视直播( IPTV )、 视频直播、 网络收音机, 用户将会使用更多基于流媒体技术的应用, 此时 RAN在承担原 有功能的基础上, 将会起到一个高性能数据路由器作用, 但对于直播类应用, 目前 RAN 无法支持 IP数据组播处理。
目前主流的移动网络, 包括 WCDMA、 CDMA2000, GSM TD-SCDMA对 IP的组播 功能支持的都不是特别充分, 在 WCDMA的 R6协议中有相关的 MBMS协议, 但其实现 比较复杂,整个协议层次是高层向低层进行, 实现难度比较大,如图 2所示,是在 WCDMA R6 MBMS业务的实现过程。
如图 2所示 , 终端(用户设备 ( UE, User Equipment;) )发出的互连网组管理协议加入 请求( IGMP, Internet Group Management Protocol ),直接发给网关 GPRS支撑节点( GGSN, Gateway GPRS Support Node ), 由 GGSN发起整个 MBMS业务的控制过程,整个更改涉及 WCDMA的多个网元, 而随着 IP网络的不断发展, 在 Internet网络上将会出现如 IPTV等 大量基于 IP组播的业务源, 而此时 UE通过 R6 MBMS透明地访问这些 IP组播数据源是 比较困难的。
同时在目前的 WCDMA R99及今后的 R4、 R5协议版本的网络中,流媒体业务在 RAN 侧是点对点传输, 而 NodeB到无线网絡控制器(RNC, Radio Network Controller )之间的 传输资源是非常有限的, 一方面由于 NodeB分布范围广, 并不是所有的 NodeB基站都有 条件铺设光纤或多条 El, 铺设成本也非常高; 另一方面对于一些没有传输资源的运营商, 租用传输资源的价格是非常高的, 而对于流媒体直播, 由于节目频道有限, 一般一个运营 商仅提供几个直播频道(如几套电视节目), 假如一个 NodeB下面的几十个用户都观看同 一个电视频道,就需要在 IUB接口上为每一个用户建立一个承载流媒体业务数据的传送通 道, 导致 IUB接口资源被大量占用, 运营商不得不为此增加传输资源, 来解决 IUB接口带 宽不足的问题。
从节省带宽的角度, 最好的方式是实现 IP组播功能, 即多个 UE在访问同一个直播节 目源时, 在移动网络的各个接口, 最好只发一份数据, 而目前协议版本为 R99、 R4、 R5 的 WCDMA网络, 没有实现 IP组播技术, 用户在进行直播流媒体业务时, 需要 WCDMA 系统的各个接口为每个用户在每个接口建立专用的通道, 同样的数据 送多次, 资源利 用率低, 用户数目受限。
对于流媒体直播业务, 由于空中接口采用专用信道, 对于每个小区所能服务的用户数 是非常有限的, 往往只有几个, 导致运营商在运营该业务时收费极高, 导致该业务不能被 普遍服务。 发明内容
本发明的目的是在移动网络中, 通过 RAN代理技术, 使 RAN能支持 IP组播功能, 同时使终端能方便地使用基于 IP组播的各种业务。
本发明系统包括:
一种基于移动网络的 IP组播系统,终端通过接入网中基站接入无线网络, 所述基站通 过无线网络基站控制器连接至核心网, 所述的基于移动网络的 IP组播系统还包括:
互联网组管理协议 IGMP代理单元,位于接入网中,设置有终端用户所属组播组信息, 其接收组播数据源发送的数据, 并将所述的数据发送给基站, 由基站将所述数据分发送给 终端。
较佳地, 所述的 IGMP代理单元, 包括:
高层次处理单元 HPU IGMP代理单元, 用于接收组播数据源发送的数据, 并将所述的 数据分发至 LPU IGMP代理单元:
低层次处理单元 LPU IGMP代理单元,用于接收终端请求,将所述的数据发送给终端。 较佳地, 所述的无线网络基站控制器中设置有:
信令及控制处理单元 SACU,用于控制所述的 HPU IGMP代理单元和 LPU IGMP代理 单元;
所述的 HPU IGMP代理单元、 LPU IGMP代理单元以及 SACU间,通过移动性组管理 协议 MGMP通信。
较佳地, 所述的 IGMP代理单元可以位于无线网络基站控制器, 也可以位于基站。 较佳地, 所述的 IGMP代理单元通过 IP路由器接收組播数据源发送的数据。
较佳地, 所述的 IGMP代理单元通过 IU-M接口接收所述的数据。
较佳地, 所述的 IGMP代理单元与组播数据源之间, 通过无线网络基站控制器与核心 网之间已经存在的物理传输通道来承载 IP数据。
较佳地, 所述的 IGMP代理单元通过 IU-PS接口接收组播数据源发送的数据。
较佳地, 所述的 IGMP代理单元与组播数据源之间, 设置有永久虚通路, 用于承载 IP 数据。
所述的组播数据源发送的数据为组播数据。
所述的组播数据源发送的数据为单播数据。
较佳地, 所述的 IGMP代理单元, 设置有单播数据-組播数据转换单元, 将所述的单播 数据转换为组播数据。
较佳地, 所述的基站还设置有多播数据分发代理单元, 用于复制组播数据, 并将复制 后的组播数据发送给终端。
本发明方法包括:
一种基于移动网络的 IP组播方法, 在无线接入网 RAN中设置 IGMP代理单元, 所述
IGMP代理单元设置有终端用户所属组播組信息, 当进行 IP数据组播时, 包括以下步驟:
A、 组播数据源向 IGMP代理单元发送数据;
B、 IGMP代理单元接收所述的数据, 并将数据发送给基站;
C、 基站将所述数据并发送给终端。
较佳地, 所述的步骤 A中, 所述组播数据源通过 IP路由器接将所述数据发送给 IGMP 代理单元。
所述的步骤 A中, 所述组播数据源发送的数据, 是组播数据。
所述的步驟 A中, 所述组播数据源发送的数据, 是单播数据, 所述步驟 B中, 所述的 IGMP代理单元将所述的单播数据地址转换为組播数据地址后, 发送给基站。
较佳地, 所述的步驟 A中, 所述组播数据源通过 TCP/IP点对点方式, 将所述数据发 送给 IGMP代理单元。
较佳地, 所述的步骤 C中, 还包括基站复制所述的数据的步驟。
较佳地, 所述的基站复制所述的数据, 由无线网络基站控制器控制完成。
较佳地, 所述的基站复制所述的数据的启动, 包括以下步驟:
无线网络基站控制器向基站发送启动数据分发消息;
基站向无线网络基站控制器发送启动数据分发确认消息。
较佳地, 所述的基站复制所述的数据的停止, 包括以下步骤:
无线网络基站控制器向基站发送停止数据分发消息;
基站向无线网络基站控制器发送停止数据分发确认消息。
较佳地, 当所述的终端加入组播组时, 包括以下步裸:
终端向 IGMP代理单元发送 IGMP加入请求消息;
IGMP代理单元向无线网络基站控制器 SACU发送 MGMP加入指示消息;
无线网络基站控制器 SACU向 IGMP代理单元发送 MGMP加入确认消息;
IGMP代理单元向终端发送 IGMP加入确认消息。 所述终端申请加入所迷的组播组时, 包括以下步骤: 终端用户向 LPU IGMP代理单元申请组播业务;
LPU IGMP代理单元判断其是否有该组播组, 如果有, 则在 LPU内部将终端用户加入 组播数据转发表; 否则,
LPU向 HPU发出 IGMP加入请求, 并为该组播组建立转发表。
较佳地, 当所述终端用户申请离开所述的组播组时, 包括以下步骤:
LPU判断该终端用户是该组播组的最后一个用户后, LPU向 HPU发出 IGMP离开请 求。
较佳地, 当所述的组播释放时, 包括以下步骤:
终端向 IGMP代理单元发送 IGMP离开请求消息;
IGMP代理单元向无线网络基站控制器 SACU发送 MGMP离开指示消息; 无线网络基站控制器 SACU向 IGMP代理单元发送 MGMP离开确认消息;
IGMP代理单元向终端发送 IGMP离开确认消息。
较佳地, 当所述的终端切换小区时, 包括以下步骤:
SACU向源 IGMP代理单元发送 IGMP离开指示消息;
源 IGMP代理单元向 SACU发送 IGMP离开确认消息;
SACU向目标 IGMP代理单元发送 IGMP加入请求消息;
目标 IGMP代理单元向 SACU发送 IGMP加入确认消息。
较佳地, 当所述的终端跨接入网或者核心网切换时, 包括以下步骤:
源 SACU向目标 SACU发送 MGMP加入请求消息;
目标 SACU向目标 IGMP代理单元发送 MGMP加入请求消息;
目标 IGMP代理单元向目标 SACU发送 MGMP加入确认消息;
目标 SACU向源 SACU发送 MGMP加入确认消息;
源 SACU向源 IGMP代理单元发送 MGMP删除请求消息;
源 IGMP代理单元向源 SACU发送 MGMP删除确认消息。
较佳地,所述的 IGMP代理单元包括 LPU IGMP代理单元和 HPU IGMP代理单元,终 端通过 LPU接入至 HPU。
本发明有益效果如下:
本发明方案中, 在接入网中设置 IGMP代理单元, 通过该 IGMP代理单元将组播数据 发送给基站, 完成组播数据的分发, 节省了网络带宽。 由于在接入网侧采用了 IGMP代理 技术, IGMP相关处理直接在接入网侧处理, 流程处理速度大加快, 使用户明显感觉到接 续速度的加快。 本发明进一步利用了移动性组管理协议 MGMP,使用户在移动过程中, 也可以接收组 播数据。 该方案很好地与移动网络相结合, 简化了 IP組播在移动网络中复杂度, 使组播数 据的传送相对于核心网是透明的, 这样用户就可以方便地访问目前 Internet 中所有组播数 据源。
本发明方案由于采用了组播数据的旁路技术, 组播数据的承载是专用的通道, 大幅度 提升了組播数据的服务质量( QOS Quality of Service )。
同时本发明为运营提供一种能大幅度降低运行成本, 尤其是节省基站到无线网络基站 控制器接口上的传输资源。 附图说明
图 1为现有技术中提供点到点业务的网络结构示意图;
图 2为现有技术中发起 MBMS业务控制的过程;
图 3为本发明在 WCDMA网络下的一个结构示意图;
图 4为本发明在 WCDMA网络下的另一个结构示意图;
图 5为本发明 IGMP代理单元及其在网络中的连接示意图;
图 6为本发明发送单播数据示意图;
图 7为本发明单播数据組成组播数据的示意图;
图 8为本发明 IGMP代理单元分发组播数据的示意图;
图 9为本发明的流程示意图;
图 10为本发明启动数据分发示意图;
图 11为本发明启动数据具体过程示意图;
图 12为本发明关闭数据分发示意图;
图 13为本发明关闭数据具体过程示意图;
图 14为本发明组播建立过程示意图; '
图 15为本发明终端申请加入组播组过程示意图;
图 16为本发明組播释放过程示意图;
图 17为本发明切换及更新小区过程示意图;
图 18为本发明跨无线网络基站控制器切换过程示意图。 具体实施方式
下面结合说明书附图来说明本发明的具体实施方式。 本发明在移动网络中, 通过无线接入网组播代理技术, 使 RAN能支持 IP组播功能, 使终端能方便地使用基于 IP組播的各种业务, 并可以直接同目前 Internet网络上丰富的组 播数据资源建立一个透明的通道,为运营商及普通用户提供低成本的基于 IP组播的流媒体 业务。
本发明所涉及的移动网络, 包含但不限于 WCDMA、 CDMA2000、 GSM、 TD-SCDMA 等移动网络, 下面以 WCDMA为实例进行说明。
如图 3及图 4所示, 是本发明方案的在 WCDMA网络结构示意图, 从图中可见, 本发 明的终端通过 RAN中基站接入无线网络, 该基站通过无线网絡基站控制器连接至核心网。 该无线网络基站控制器,在不同的无线网络中可以是不同的网络单元, 比如在 WCDMA和 TD-SCDMA 中是 RNC, 在 GSM 中是基站控制器(BSC , Base Station Controller ), 在 CDMA2000中是 CBSC。
如图 5 所示, 是本发明设置的一个互联网组管理协议(IGMP )代理单元及其在系统 中的连接, 该 IGMP代理单元位于 RAN中, 设置有终端用户所属組播组信息, 用于接收 组播数据源发送的組播数据 , 并将所述的组播数据发送给基站, 由基站将所述組播数据分 发送给终端。
本发明在 RAN实现分级的 IGMP代理功能, 同时针对 IP组播用户面数据, 在 RAN 侧直接使用旁路技术, 在 RAN 侧新增一个专门处理组播数据的接口 IU-M(IU-Multicast Interface)接口, 组播数据可以从具备组播转发功能的 IP组播路由器上直接获取, 也可以借 用 RAN与 CN之间已有物理传输通道来承载 IP组播数据, 例如在 IU-PS接口, 单独建立 一条 IP数据的永久虚通路( PVC ( IP0A ) ), 承载 IP組播数据, 在对 IP组播数据的用户面 分发, 最低层放在基站(比如在 WCDMA网络中的 NodeB )进行分发, 这样在一个基站 下的多个小区可在基站与无线网络基站控制器接口 (比如 WCDMA网络中的 IUB接口) 同时共享一个组播数据源。
如图 3 , 发往终端的用户面数据, 被分成了两个部分, 其 IP 组播数据可以不再通过 CN进行转发, 而是通过 IP组播网络进行旁路转发, 数据经过多级具有组播转发功能的路 由器, 直接发给 RAN中的 IGMP代理单元。 而 UE其他的面向链接 TCP/IP数据, 则还是 通过原路径与组播数据源进行通信。 承载组播数据的逻辑通道可以独立成网, 也可以与移 动网络中相关网元共用物理接口, 比如在 WCDMA网络中与 IU接口共用一条 ATM Over SDH, 在其上单独配置一条承载组播数据的 PVC通道。
如图 6及图 7所示, 被旁路的組播数据, 不仅可以直接进行组播旁路, 也可以先用单 播数据的方式将用户数据报协议(UDP, User Datagram Protocol ) 包通过 IP 网络传送到 RAN,再由 RAN上的组播代理将其转换成组播数据传送给 UE, 这种情况非常适合于建网 初期, 支持组播传输的 IP传输网络不成熟, 且移动网所承载的组播业务不多情况下, 为终 端提供基本的组播业务支持。
将单播数据转换成组播数据, 可以通过网络设置, 由 IGMP代理单元将某一单播 IP 地址转换成某一特定组播地址, 这样 IGMP代理单元就会检查每一个从 IU-M发过来的数 据包, 如果其目的地址是被指定的要转换的 IP地址, 就将其按设置换成特定的 IP组播地 址的数据。'上述由单播数据包转换成组播包只是一个增加的功能, 从 IU-M接口发过来的 数据本身就可以是组播数据包。
本发明将原来在移动网络中处理 IGMP組播功能由 CN移至 RAN来处理, 在本发明 中, 该 IGMP代理单元被放置到 RAN中, 可以放到无线网络基站控制器, 也可以放置到 基站中。
该 IGMP代理单元, 可以为多级设置, 如图 7所示, 本方案中以作两级设置为例进行 说明, 多于两级的设置与此类似, 不再详述。 该两级设置包括:
高层次处理单元( HPU High Process Unit ) IGMP代理单元, 用于接收组播数据源发送 的组播数据, 并将所述的组播数据分发至 LPU IGMP代理单元。
低层次的处理单元(LPU Lower Process Unit) IGMP代理单元, 用于接收终端请求, 将 所述的组播数据发送给终端。
RAN内部的 IGMP代理单元实现原理如图 7所示, 图中的粗体部分,是本发明新增的 实体, 即在无线网络基站控制器设置 IGMP代理单元, UE发出的 IGMP消息直接在无线 网络基站控制器内部进行处理,无线网络基站控制器在内部也可以实现分级的 I.GMP代理 功能, 本发明实施例暂时分成两级: 低层次的处理单元 LPU (Lower Process Unit), 及高层 次处理单元 HPU ( High Process Unit )。在 LPU中实现的 IGMP代理单元, 可以作为一台组 播路由器管理下面的组播用户组, 从而减轻 HPU的 IGMP的处理负担, 实现 IGMP代理 单元的分布式处理, 当终端用户申请加入某一个组播组时, 若在 LPU中没有该组播组, 则 LPU会向 HPU发出 IGMP加入请求, 并为该組播组建立转发表, 若在 LPU内部已经有了 该组播组, 则在 LPU内部将终端用户加入組播数据转发表, LPU不再向 HPU发出 IGMP 加入请求。 当终端用户申请离开某组播组时, 若为该组播组的最后一个终端用户, 则 LPU 向 HPU发出 IGMP离开报文, 若不是最后一个终端用户, 则不向 HPU发出 IGMP离开报 文, HPU也同样具备相应特性, 当 HPU接收到 LPU发出的 IGMP离开报文时, 若为该组 播组的最后一个终端用户,则向更上一层发出 IGMP离开报文,若不是最后一个终端用户, 则不向上层路由器发出 IGMP离开消息。 在建网初期, 由于移动网所承载的组播业务不多, 可以直接利用无线网络基站控制器 内部基于硬件的组播功能, 例如, 如果无线网络基站控制器的硬件平台基于 ATM交换, 则可以直接利用 ATM层的组播及广播功能, 直接将数据从 HPU分发至 LPU, 再由 LPU 根据是否有用户请求, 而确定是否再进一步分发; 如果无线网络基站控制器的硬件平台基 于 IP交换, 则可以利用 IP组播交换功能, 直接将数据从 HPU分发至 LPU , 再由 LPU根 据是否有用户请求, 而确定是否再进一步分发。 以下以基于 ATM交换平台的无线网络基 站控制器为例, 说明组播数据分发过程。
如图 8所示, 采用所示无线网络基站控制器内部基于硬件的 ATM組播功能, 将简化 无线网络基站控制器内部组播数据的分发处理, 同时提供了很高的服务质量( QOS )保证。
本发明方案中, 由于终端具有移动性, 为此 IGMP代理单元需要同无线网络基站控制 器的信令及控制单元( SACU ), 进行协议交互, 以实现终端的可移动性, 该协议为移动性 组管理协议 MGMP ( Mobile Group Management Protocol )。
如图 8所示, 位于基站的多播数据分发代理( MDDA Multicast Data Distribute Agent ) 单元, 是一个多播数据分发代理, 其是一个可选单元, 主要目的是节省基站到无线网络基 站控制器接口 (IUB接口) 的带宽, 当一个基站(NodeB ) 下的多个小区都有相同的组播 数据发送时, 在基站到无线网络基站控制器接口 (IUB接口)只需要传送一份, MDDA负 责将其复制成多份, 并将其在多个小区的空口上发送给接收这些组播数据的终端。
本发明基于移动网络的 IP組播方法,基于该 IGMP代理单元,该 IGMP代理单元设置 在 RAN中, 其上设置有终端所属組播组信息, 当进行 IP数据组播时, 如图 9所示, 包括 以下步骤:
S 1、 组播数据源向 IGMP代理单元发送数据;
组播数据源将需要向终端組播的数据发送给 IGMP, 该数据可以是组播数据, 也可以 是单播数据, 如果是单播数据的话, 还需要在 IGMP代理单元将所述的单播数据转换为组 播数据。
这里, 组播数据源可以通过两种方式将数据发送至 IGMP代理单元:
A、 通过 IP路由器将所述数据发送给 IGMP代理单元;
B、 通过 TCP/IP点对点方式, 将所述数据发送给 IGMP代理单元。
S2、 IGMP代理单元接收所述的数据, 并将数据发送给基站;
IGMP代理单元接收所述的数据后, 如果是单播数据, 则进行该单播数据向組播数据 的转换处理, 可以按照图 7所示进行处理。 IGMP代理单元将所述的单播数据地址转换为 組播数据地址, 然后将组播数据发送给基站; 如果是组播数据, 则直接发送给基站, 由基 站分发给不同小区内的终端。
S3、 基站将所述数据分发给终端。
基站将所述的组播数据向小区内的终端发送, 以使终端可以接收到所述的组播数据, 享受到相应的服务。
该步骤中, 还可以包括基站复制所述的数据的步骤, 以及基站停止复制所述的数据的 步骤, 上述基站复制所述数据的过程由无线网络基站控制器控制完成, 具体包括:
基站复制所述的数据的启动, 如图 10所示, 包括:
无线网络基站控制器向基站发送启动数据分发消息;
基站向无线网络基站控制器发送启动数据分发确认消息。
如果基站与无线网络基站控制器之间的传输是直连方式, 则此时无线网络基站控制器 直接将业务数据下发给基站。
如果基站与无线网络基站控制器之间的传输承载网是通过 IP网络进行的,则基站控制 器下发的启动数据分发后, 可采用如图 11所示的方案:
NodeB MDDA先向 IP网络传输设备发起 IGMP加入消息',如果 IP网絡传输设备此时 没有对应的组播数据源, 则该 IP网络传输设备按 IP组播协议逐级向上一级的 IP网络传输 设备发起 IGMP加入消息, 直到 IGMP加入消息传送到 RNC为止, RNC收到 IGMP加入 消息后 ,将相应的组播业务数据按 IP组播协议下发给 IP网络传输设备后, 同时 RNC向 IP 网络传输设备发送 IGMP加入确认消息, IP网络传输设备按 IP组播协议逐级将 IGMP加 入确认消息传送到基站,基站收到 IGMP加入确认消息后通过已有的信令传输通道向 RNC 发送启动数据分发确认消息。
基站复制所述的数据的停止, 如图 12所示, 包括: . ■"' 无线网络基站控制器向基站发送停止数据分发消息;
基站向无线网络基站控制器发送停止数据分发确认消息。
如果基站与无线网络基站控制器之间的传输是直连方式, 则此时无线网络基站控制器 直接停止下发业务数据给基站。
如果基站与无线网络基站控制器之间的传输承载网是通过 IP网络进行的 ,则基站在收 到基站控制器下发的停止数据分发后, 可采用如图 13所示的方案:
NodeB MDDA向 IP网络传输设备发起 IGMP离开消息, 如果 IP网络传输设备此时没 有其他的 NodeB接收该組播数据源, 则该 IP网络传输设备按 IP组播协议逐级向上一级的 IP网络传输设备发起 IGMP离开消息, 直到 IGMP离开消息传送到 RNC为止, RNC收到 IGMP离开消息后, 停止向 IP网络传输设备发送组播业务数据, 同时 RNC向 IP网络传输 设备发送 IGMP离开确认消息, IP网络传输设备按 IP组播协议逐级将 IGMP离开确认消 息传送到基站, 基站收到 IGMP离开确认消息后通过已有的信令传输通道向 RNC发送停 止数据分发确认消息。
该 IGMP代理单元可以分级设置, 比如设置为 LPU和 HPU, 终端通过 LPU接入至 本发明基于移动网络的 IP组播方法, 包括几个中间过程, 具体为:
1、 组播建立时, 如图 14所示, 包括以下步骤:
Sll、 终端向 IGMP代理单元发送 IGMP加入请求消息;
S12JGMP代理单元向无线网絡基站控制器的信令及控制处理单元( SACU, Signal And Control Unit )发送 MGMP加入指示消息;
S13、 SACU向 IGMP代理单元发送 MGMP加入确认消息;
S14、 IGMP代理单元向终端发送 IGMP加入确认消息。
2、 终端向 IGMP代理单元申请加入组播組时, 如图 15所示, 包括以下步骤: S21、 终端向 IGMP代理单元申请组播业务;
S22、 LPU判断其是否有该组播組, 如果有, 进入步骤 S23, 否则, 进入步骤 S 24;
523、 在 LPU 内部将用户加入组播数据转发表
524、 LPU向 HPU发出 IGMP加入请求, 并为该组播组建立转发表。
3、 组播释放时, 如图 16所示, 包括以下步骤:
S31、 终端向 IGMP代理单元发送 IGMP离开请求消息;
S32、 IGMP代理单元向 SACU发送 MGMP离开指示消息;
S33、 SACU向 IGMP代理单元发送 MGMP离开确认消息;
S34、 IGMP代理单元向终端发送 IGMP离开确认消息。
4、 终端申谞离开所述的组播组时, 包括以下步骤:
LPU判断该终端用户是否是该组播組的最后一个终端用户, 如果是, LPU向 HPU发 出 IGMP离开请求。
5、 终端切换小区时, 如图 17所示, 包括以下步骤:
S51、 SACU向源 IGM?代理单元发送 IGMP离开指示消息;
S52、 源 IGMP代理单元向 SACU发送 IGMP离开确认消息;
S53、 SACU向目标 IGMP代理单元发送 IGMP加入请求消息;
S54、 目标 IGMP代理单元向 SACU发送 IGMP加入确认消息。
6、 终端跨 RAN或者 CN切换时, 如图 18所示, 包括以下步骤: S61、 源 SACU向目标 SACU发送 MGMP加入请求消息;
562、 目标 SACU向目标 IGMP代理单元发送 MGMP加入请求消息;
563、 目标 IGMP代理单元向目标 SACU发送 MGMP加入确认消息;
564、 目标 SACU向源 SACU发送 MGMP加入确认消息;
S65、 源 SACU向源 IGMP代理单元发送 MGMP删除请求消息;
S66、 源 IGMP代理单元向源 SACU发送 MGMP删除确认消息。
本发明在移动网络中, 通过 RAN组播代理技术, 使 RAN能支持 IP组播功 同时 为解决用户的移动性, 而利用了移动性组管理协议 ( MGMP Mobile Group Management Protocol ), 使移动用户能方便地使用基于 IP组播的各种业务, 并可以直接同目前 Internet 网络上丰富的组播数据资源建立一个透明的通道, 为运营商及普通用户提供低成本的基于 IP组播的流媒体业务。
显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和 范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种基于移动网络的 IP組播系统,' 终端通过接入网中基站接入无线网络, 所述基 站通过无线网络基站控制器连接至核心网,其特征在于, 所述的基于移动网络的 IP组播系 统还包括:
互联网组管理协议 IGMP代理单元,位于接入网中,设置有终端用户所属组播组信息, 其接收组播数据源发送的数据, 并将所述的数据发送给基站, 由基站将所述数据分发送给 终端。
2、 如权利要求 1所述的系统, 其特征在于, 所述的 IGMP代理单元, 包括: 高层次处理单元 HPU IGMP代理单元, 用于接收组播数据源发送的数据, 并将所述的 数据分发至 LPU IGMP代理单元:
低层次处理单元 LPU IGMP代理单元,用于接收终端请求,将所述的数据发送给终端。
3、 如权利要求 2所述的系统, 其特征在于, 所述的无线网络基站控制器中设置有: 信令及控制处理单元 SACU,用于控制所述的 HPU IGMP代理单元和 LPU IGMP代理 单元;
所述的 HPU IGMP代理单元、 LPU IGMP代理单元以及 SACU间, 通过移动性组管理 协议 MGMP通信。
4、 如权利要求 1所述的系统, 其特征在于, 所述的 IGMP代理单元可以位于无线网 络基站控制器, 也可以位于基站。
5、 如权利要求 1所述的系统, 其特征在于, 所述的 IGMP代理单元通过 IP路由器接 收组播数据源发送的数据。
6、 如权利要求 5所述的系统, 其特征在于, 所述的 IGMP代理单元通过 IU-M接口接 收所述的数据。
7、 如权利要求 1所述的系统, 其特征在于, 所述的 IGMP代理单元与组播数据源之 间, 通过无线网络基站控制器与核心网之间已经存在的物理传输通道来承栽 IP数据。
8、 如权利要求 1所述的系统, 其特征在于, 所述的 IGMP代理单元通过 IU-PS接口 接收组播数据源发送的数据。
9、 如权利要求 8所述的系统, 其特正在于, 所述的 IGMP代理单元与組播数据源之 间, 设置有永久虚通路, 用于承载 IP数据。
10、 如权利要求 1所述的系统, 其特征在于, 所述的组播数据源发送的数据为组播数 据。
11、 如权利要求 1所迷的系统, 其特征在于, 所述的組播数据^发送的数据为单播数 据。
12、 如权利要求 11所述的系统, 其特征在于, 所述的 IGMP代理单元, 设置有单播数 据-組播数据转换单元, 将所述的单播数据转换为组播数据。
13、 如权利要求 10、 11或 12所述的系统, 其特征在于, 所述的基站还设置有多播数 据分发代理单元, 用于复制组播数据, 并将复制后的组播数据发送给终端。
14、一种基于移动网络的 IP组播方法,其特征在于,在无线接入网 RAN中设置 IGMP 代理单元, 所述 IGMP代理单元设置有终端用户所属组播组信息, 当进行 IP数据组播时, 包括以下步骤:
A、 組播数据源向 IGMP代理单元发送数据;
B、 IGMP代理单元接收所述的数据, 并将数据发送给基站;
C、 基站将所述数据并发送给终端。
15、 如权利要求 14所述的方法, 其特征在于, 所述的步骤 A中, 所述组播数据源通 过 IP路由器接将所述数据发送给 IGMP代理单元。
16、 如权利要求 15所述的方法, 其特征在于, 所述的步骤 A中, 所述组播数据源发 送的数据, 是组播数据。
17、 如权利要求 14或 15所述的方法, 其特征在于, 所述的步骤 A中, 所述组播数据 源发送的数据, 是单播数据, 所述步骤 B中, 所述的 IGMP代理单元将所述的单播数据地 址转换为组播数据地址后, 发送给基站。
18、 如权利要求 14所述的方法, 其特征在于, 所述的步驟 A中, 所述組播数据源通 过 TCP/IP点对点方式, 将所述数据发送给 IGMP代理单元。
19、 如权利要求 14所述的方法, 其特征在于, 所迷的步 c中, 还包括基站复制所 述的数据的步骤。
20、 如权利要求 19 所述的方法, 其特征在于, 所述的基站复制所述的数据, 由无线 网络基站控制器控制完成。
21、 如权利要求 20 所述的方法, 其特征在于, 所述的基站复制所述的数据的启动, 包括以下步骤:
无线网络基站控制器向基站发送启动数据分发消息;
基站向无线网络基站控制器发送启动数据分发确认消息。
22、 如权利要求 20 所述的方法, 其特征在于, 所述的基站复制所述的数据的停止, 包括以下步骤: 无线网络基站控制器向基站发送停止数据分发消息;
基站向无线网络基站控制器发送停止数据分发确认消息。
23、 如权利要求 14所述的方法, 其特征在于, 当所述的终端加入组播组时, 包括以 下步骤:
终端向 IGMP代理单元发送 IGMP加入请求消息;
IGMP代理单元向无线网络基站控制器 SACU发送 MGMP加入指示消息;
无线网络基站控制器 SACU向 IGMP代理单元发送 MGMP加入确认消息;
IGMP代理单元向终端发送 IGMP加入确认消息。
24、如权利要求 23所迷的方法, 其特征在于, 所述的 IGMP代理单元包括 LPU IGMP 代理单元和 HPU IGMP代理单元, 当所述终端申请加入所述的组播组时, 包括以下步骤: 终端用户向 LPU IGMP代理单元申请组播业务;
LPU IGMP代理单元判断其是否有该组播组, 如果有, 则在 LPU内部将终端用户加入 组播数据转发表; 否则,
LPU向 HPU发出 IGMP加入请求, 并为该组播组建立转发表。
25、 如权利要求 24 所述的方法, 其特征在于, 当所述终端用户申请离开所述的组播 组时, 包括以下步骤:
LPU判断该终端用户是该組播組的最后一个用户后, LPU向 HPU发出 IGMP离开请 求。
26、 如权利要求 14所述的方法, 其特征在于, 当所述的组播释放时, 包括以下步骤: 终端向 IGMP代理单元发送 IGMP离开请求消息;
IGMP代理单元向无线网络基站控制器 SACU发送 MGMP离开指示消息;
无线网络基站控制器 SACU向 IGMP代理单元发送 MGMP离开确认消息;
IGMP代理单元向终端发送 IGMP离开确认消息。
27、 如权利要求 14 所述的方法, 其特征在于, 当所述的终端切换小区时, 包括以下 步驟:
SACU向源 IGMP代理单元发送 IGMP离开指示消息;
源 IGMP代理单元向 SACU发送 IGMP离开确认消息;
SACU向目标 IGMP代理单元发送 IGMP加入请求消息;
目标 IGMP代理单元向 SACU发送 IGMP加入确认消息。
28、 如权利要求 14 所述的方法, 其特征在于, 当所述的终端跨接入网或者核心网切 换时, 包括以下步骤: 源 SACU向目标 SACU发送 MGMP加入请求消息;
目标 SACU向目标 IGMP代理单元发送 MGMP加入请求消息;
目标 IGMP代理单元向目标 SACU发送 MGMP加入确认消息;
目标 SACU向源 SACU发送 MGMP加入确认消息;
源 SACU向源 IGMP代理单元发送 MGMP删除请求消息;
源 IGMP代理单元向源 SACU发送 MGMP删除确认消息。
29、 如权利要求 14所述的方法, 其特征在于, 所述的 IGMP代理单元包括 LPU IGMP 代理单元和 HPU IGMP代理单元, 终端通过 LPU接入至 HPU。
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