WO2006089470A1 - Procédé de mise en oeuvre de transmission de courants d’informations en ngn - Google Patents

Procédé de mise en oeuvre de transmission de courants d’informations en ngn Download PDF

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Publication number
WO2006089470A1
WO2006089470A1 PCT/CN2005/001585 CN2005001585W WO2006089470A1 WO 2006089470 A1 WO2006089470 A1 WO 2006089470A1 CN 2005001585 W CN2005001585 W CN 2005001585W WO 2006089470 A1 WO2006089470 A1 WO 2006089470A1
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WO
WIPO (PCT)
Prior art keywords
signaling
ngn
channel
media stream
service
Prior art date
Application number
PCT/CN2005/001585
Other languages
English (en)
French (fr)
Inventor
Enhui Liu
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 AT05791953T priority Critical patent/ATE443389T1/de
Priority to DE602005016727T priority patent/DE602005016727D1/de
Priority to EP05791953A priority patent/EP1848149B1/en
Publication of WO2006089470A1 publication Critical patent/WO2006089470A1/zh
Priority to US11/844,169 priority patent/US7792985B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1043—Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/72—Admission control; Resource allocation using reservation actions during connection setup
    • H04L47/724—Admission control; Resource allocation using reservation actions during connection setup at intermediate nodes, e.g. resource reservation protocol [RSVP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/805—QOS or priority aware
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/821—Prioritising resource allocation or reservation requests
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2514—Translation of Internet protocol [IP] addresses between local and global IP addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/256—NAT traversal
    • H04L61/2564—NAT traversal for a higher-layer protocol, e.g. for session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols

Definitions

  • the present invention relates to the field of Next Generation Network (NGN) technology, and more particularly to a method for implementing information stream transmission in an NGN.
  • NGN Next Generation Network
  • NGN is a converged network that uses packet technology such as IP as a bearer network technology to fuse fixed and mobile communications, and carries various telecommunication services such as voice, image and data through IP connectivity between communicating entities.
  • packet technology such as IP
  • IP packet technology
  • telecommunication services such as voice, image and data
  • the service reachability requirement has been proposed for NGN, that is, regardless of the access technology adopted by the NGN, the user can obtain the subscribed NGN service at any time on demand.
  • the signaling flow of the NGN service is smoothly and reliably transmitted.
  • all IP packets sent by the user are forwarded in a best effort or priority manner, and the signaling flow and the media stream of the NGN service are mixed and transmitted. Since the network bandwidth is always limited, when any network bandwidth or a node between the user and the service control function entity is full or congested, the signaling flow of the NGN service may be discarded and cannot reach the service control function entity.
  • the signaling flow of the NGN service includes a service request signaling packet of the household. Therefore, even if the user requests a service with a higher priority, there is a case where the response cannot be obtained, and the service reachability cannot be achieved.
  • the IP network transmitting node in the case that the signaling flow and the media stream of the NGN service are mixed and transmitted, it is difficult for the IP network transmitting node to distinguish whether the transmitted message is a signaling flow message or a media flow message, and the NGN service letter cannot be guaranteed when congestion occurs. The flow message is not discarded. In this case, obviously there is no The law achieves business accessibility.
  • the services requested by the user may also be high-priority emergency call services, such as police, fire, traffic police, and medical assistance. These services use a common number that is familiar to the public, and requires 24 hours to remain unobstructed, and each telephone user Have the right to call an emergency number for help.
  • This kind of service not only requires ensuring the smooth flow and reliable transmission of the signaling flow of the service, but also ensures that the media stream is established and reliably transmitted at any time. If the signaling flow cannot reach the service control entity reliably, the application session cannot be established, and the media stream cannot start, not to mention supporting the emergency call service and ensuring the quality of the transmission service of the media stream.
  • a network address translation (NAT) device and a security device such as a firewall device may be deployed in the NGN bearer network, and deployed for the media stream and implemented by the service control entity.
  • NAT network address translation
  • a security device such as a firewall device
  • the established NGN is mainly used for packetization of voice services.
  • the IP physical private network is used to carry voice services, and the data services are still carried by the original Internet network. That is to say, the traditional telephone terminal is still connected to the voice gateway device through the ordinary telephone line, and the computer device is connected to the broadband access server through the digital subscriber line (xDSL) and the Ethernet.
  • xDSL digital subscriber line
  • the voice service and the data service are isolated from each other at the user end, and the IP private network carrying the voice service plans sufficient redundant bandwidth to avoid congestion, thereby ensuring the signaling flow and media stream transmission of the voice service. reliability. Therefore, the EP private network solution of the NGN voice service not only ensures the user's accessibility to the NGN voice service, but also supports the emergency call service.
  • NGN IP private network
  • the ultimate goal of NGN is to carry all NGN services with an all-IP network, that is, to carry all IP value-added services, including voice services, video services and data services.
  • IP value-added services including voice services, video services and data services.
  • the voice traffic will have a small share in the total number of NGN services and will gradually decrease. Therefore, operators need to consider the transmission performance of other services, and if all NGN services are IP physical.
  • the NGN access network and the core network are gradually IP-based.
  • the common interface between the user and the network adopts IP technology, and the voice, video, and data services pass the EP.
  • Technology enables end-to-end delivery.
  • the NGN service refers to the serviceable and manageable carrier-class ⁇ >value-added service.
  • the IP network resources can be logically segmented by using a pre-planning configuration method. Different logics carry different services.
  • the voice, video, and data services are isolated in the access network and the core network, and bandwidth is reserved for each of the services, where a permanent virtual link (PVC) or a virtual local area network (VLAN) can be used in the access network.
  • PVC permanent virtual link
  • VLAN virtual local area network
  • MPLS Multi-Protocol Label Switching
  • Pre-entry control at the edge of the network and different service media Flow labels are forwarded with different forwarding priorities and packet loss priorities. Through this setting, routing and bandwidth occupation of different service types are not interfered with each other.
  • the signaling flow and the media stream of the service in the NGN scheme are still mixed and transmitted in the logical network, and only the signaling flow and the media stream marked as the highest priority service are unimpeded under any resource occupancy rate. Reliable delivery. Even if it is considered that the bandwidth is separately reserved for the signaling flow, only the logical bearer network and the reserved bandwidth are allocated for the signaling flow of the NGN voice service, and the isolation of the signaling flow of other NGN services is not uniformly considered. In fact, the telecommunications carrier should ensure that the signaling flow of all NGN services subscribed by the subscriber is unimpeded and reliable, regardless of the service level or category of the media stream of the service.
  • the industry does not realize that for all carrier-class services, the first step is to ensure the accessibility of services, that is, the signaling flow of all carrier-class services is unimpeded under any resource occupation. Reliable delivery.
  • the industry has not realized that this is the primary condition for triggering the function of NGN resource and admission control function entities, and it is also the primary condition for supporting emergency calls in NGN .
  • the latter NGN solution can ensure the service quality of the service within the planned traffic range, and the network resource utilization rate is improved compared with the IP private network solution.
  • the current NGN solution cannot guarantee the smooth and reliable transmission of signaling flows of all NGN services, thus failing to achieve service reachability.
  • the signaling flow of the NGN service cannot reach the service control entity, and the media stream cannot be transmitted, so that the emergency call service cannot be implemented, and the admission control of the media stream cannot be triggered.
  • the main problem to be solved by the present invention is to provide a method for implementing information flow transmission in a Next Generation Network (NGN) to ensure smooth and reliable transmission of signaling flows of NGN services.
  • NGN Next Generation Network
  • the present invention still further provides a method of transmitting a media stream of an NGN service.
  • the present invention further provides resource and admission control methods for media streams of NGN services.
  • the present invention further provides a method for ensuring reliable transmission of emergency call services in an NGN.
  • the technical solution of the present invention is as follows: A method for realizing information flow transmission in GN,
  • a signaling channel for transmitting a signaling flow of the NGN service is set in the NGN, and a bandwidth is reserved for the signaling channel;
  • the method further includes: the transmitting end transmitting the signaling flow of the NGN service in the user traffic according to the highest priority through the set signaling channel to the receiving end.
  • the NGN includes an IP access network, an IP core network, and an NGN service subsystem.
  • the signaling channel is set in the NGN as: an access network signaling channel for transmitting a signaling flow is set in the EP access network, And setting a core network signaling channel for transmitting a signaling flow in the IP core network;
  • the sending end transmits the signaling flow of the NGN service in the user traffic to the receiving end through the set signaling channel, and includes the following steps: Al.
  • the IP access network transmits the signaling flow of the NGN service in the user traffic sent by the sender through the set access network signaling channel to the IP core network;
  • the IP core network transmits the signalling stream transmitted through the signaling channel in the access network to the core network signaling channel until the corresponding receiving end.
  • the step a includes:
  • the access node in the IP access network identifies and separates the signaling flow of the NGN service in the user traffic, and transmits the signaling flow to the aggregation node through the access network signaling channel according to the highest priority;
  • the aggregation node forwards the signaling flow in the channel to the highest priority through the access network signaling channel to the edge node according to the identifier of the access network signaling channel;
  • the edge node sends the signaling flow to a border node in the IP core network.
  • the IP packet header information of the signaling flow includes signaling identifier information that can identify the signaling packet of the packet as an NGN service, where the signaling identifier information is: a fixed port number and a protocol number, or points to the NGN.
  • the access node in the IP access network identifies and separates the signaling flow of the NGN service in the user traffic, specifically: identifying from the user traffic according to the signaling identifier information in the signaling packet. And the signaling of the NGN service is separated.
  • the IP packet header information of the signaling flow includes signaling identifier information that can identify the signaling packet of the packet as an NGN service, where the signaling identifier information is: a fixed port number and a protocol number, or points to the NGN.
  • the method further includes: pre-setting a signaling channel for signaling transmission between the resident gateway of the GN user and the access node of the IP access network; the resident gateway according to the signaling identification information in the signaling message Identifying and separating the signaling message of the NGN service in the user traffic, and sending the signaling packet to the access node of the IP access network through the signaling channel according to the highest priority;
  • the access node in the IP access network identifies and separates the signaling flow of the NGN service in the user traffic, specifically: identifying and separating the channel according to the identifier of the signaling channel.
  • the signaling stream of the transmission is not limited to the signaling stream of the transmission.
  • the NGN includes an IP access network, an IP core network, and an NGN service subsystem.
  • the signaling channel is set in the NGN to: set an access network signaling channel for transmitting a signaling flow in the IP access network, And setting a core network signaling channel for transmitting a signaling flow in the IP core network;
  • the sending end transmits the signaling flow in the user traffic to the receiving end through the set signaling channel, including the following steps:
  • the IP core network transmits the signaling flow in the user traffic sent by the sending end through the set core network signaling channel until the IP access network;
  • the IP access network transmits the signaling stream transmitted through the signaling channel in the IP core network through the access network signaling channel, and transmits the signaling stream to the corresponding receiving end through the access node.
  • the sending end is an NGN service subsystem
  • the step a2 includes: the border node directly connected to the NGN service subsystem identifies and separates the signaling flow of the NGN service from the user traffic, and forwards the signaling flow to the core network signaling channel according to the highest priority. Up to the border node connected to the access network; the border node connected to the IP access network sends the signaling flow to the IP access network.
  • the IP access network transmits the signaling flow through the access network signaling channel, including:
  • the edge node in the IP access network selects the signaling flow sent by the IP core network according to the highest The priority is forwarded through the access network signaling channel to the aggregation node of the IP access network; b22.
  • the aggregation node passes the signaling flow in the channel according to the highest priority according to the identifier of the access network signaling channel.
  • the access network signaling channel forwards the packet to the access node of the EP access network.
  • the NGN further includes a network security device and/or an address translation device, where the destination address or source address of the signaling flow is an NGN service proxy device;
  • the method further includes: configuring the network security device and/or the address translation device by default to allow the destination address or the source address to be a signaling flow of the NGN service proxy device.
  • the method may further include: setting, in a network remaining transmission resource after the NGN reserved signaling channel, a media channel for transmitting the media stream for the media stream of the NGN service, and when the set media channel is more than one, Different media channels are set with different priority levels; the sender transmits the media stream in the user traffic through the set media channel to the receiving end.
  • Setting the media channel for the media stream in the NGN is: setting an access network media channel for transmitting the media stream in the IP access network, and setting a core network media channel for transmitting the media stream in the IP core network;
  • the sending end transmits the media stream in the user traffic to the receiving end through the set media channel, including the following steps:
  • the IP access network forwards the media stream in the user traffic sent by the sending end to the IP core network through the access network media channel;
  • the IP core network forwards the media stream through the core network media channel, and sends the media stream to the receiving end.
  • Setting the media channel for the media stream in the NGN is: setting an access network media channel for transmitting the media stream in the IP access network, and setting a core network media channel for transmitting the media stream in the IP core network;
  • the sending end transmits the media stream in the user traffic to the receiving end through the set media channel, including the following steps:
  • the IP core network forwards the media stream in the user traffic sent by the sending end to the CP access network through the core network media channel;
  • the IP access network forwards the media stream through the access network media channel, and sends the media stream to the receiving end.
  • the method may further include: determining, by the resource and the admission control device, whether the media stream is admitted, and determining a quality of service level of the admitted media stream, and then identifying the media stream, the determined admission, and the quality of service level.
  • the information is sent to the forwarding node at the edge of the network in the NGN for execution;
  • the method further includes: determining, by the forwarding node at the edge of the network, whether the corresponding media stream is allowed to enter the network according to the identifier and the admission information of the media stream. And forward the media stream according to the quality of service level information.
  • the method may further include: when determining that the media stream cannot be admitted, the resource and the admission control device return a reason code that cannot be admitted to the device that initiates the resource request; and the device that initiates the resource request receives the reason After the code, a resource of a lower quality of service level is requested for the media stream, or a user service request corresponding to the media stream is rejected.
  • the transmitted media stream is a media stream of an emergency call service
  • the method further includes: determining, by the resource and the admission control device, the media stream of the emergency call service as a highest priority and a service shield level, and transmitting the media stream admission and highest priority and quality of service level information to the The forwarding node at the edge of the network performs the operation and determines whether the highest priority resource is idle. If yes, no other processing is performed; otherwise, the resources occupied by other non-emergency media streams are reduced or other non-emergency services are reduced.
  • the quality of service level of the media stream, and the resources used to transmit the emergency call The media stream of the business.
  • the NGN further includes a network security device and/or an address translation device, where the destination address or source address of the signaling flow is an NGN service proxy device;
  • the NGN service proxy device only has a signaling proxy function, and the method further includes: when the signaling flow is processed by the NGN service proxy device, issuing a command to control the network security device and/or the address translation device, the network security device, and And/or the address translation device performs corresponding security or address translation processing on the media stream according to the command;
  • the method further includes: configuring the network security device and/or the address translation device to allow the destination address or the source address to be an NGN service proxy by default.
  • the signaling flow and media stream of the device pass.
  • the method may further include: the ingress node transmitting the media stream in the network domain converts the media stream into an encoding manner, and forwards the media stream according to the converted encoding manner, and the egress node converts the received media stream into an original The encoding method, and the media stream is forwarded according to the original encoding method.
  • the solution of the invention provides a signaling channel for the signaling flow, and reserves bandwidth for the signaling channel, thereby ensuring smooth and reliable transmission of the signaling flow, and providing signaling flow transmission for realizing service reachability. Guarantee.
  • the solution of the present invention further ensures reliable transmission of the signaling stream by allowing the flow through the signaling by default configuration in the NAT and/or firewall device.
  • the solution of the invention also ensures the secure transmission of the signaling channel by setting signaling monitoring and filtering functions in the forwarding node of the network domain.
  • the present invention further provides a media stream transmission scheme for setting media channels for media streams, and setting different priority media stream transmission schemes for different media channels, so that resource streaming may not exist in the prior art while implementing media stream transmission. Phenomenon, guaranteeing the user's ordering business Transmission.
  • the solution of the present invention further provides that the default setting in the NAT and/or firewall device allows streaming through the media, thereby further ensuring reliable transmission of the media stream.
  • the solution of the invention also provides a code conversion function for media stream transmission, which is converted into a better quality of service code at the network entry, and then restored to the original code at the network exit, thereby enhancing the anti-delay and anti-time of the media stream.
  • the solution of the present invention also filters the suspicious media stream by setting the media stream filtering function on the forwarding node at the edge of the network domain, thereby preventing the NGN service subsystem from being attacked.
  • the solution of the present invention also provides a scheme for determining, by the resource and the admission control device, the media stream of the emergency call service as the highest priority and the highest quality of service level, and controlling the network forwarding node to perform, and at the highest priority and the quality of service level.
  • the transmission resource is free, the resources of the non-emergency service are released or the quality of service of the non-emergency service is reduced, and the released resources are used for media stream transmission of the emergency call service, thereby ensuring reliable transmission of the emergency call service.
  • FIG. 1 is a schematic structural diagram of an NGN network carried by a full port
  • FIG. 3 is a flow chart of signaling flow transmission in the downlink direction in the solution of the present invention. Mode for carrying out the invention
  • the solution of the present invention is to maintain sufficient bandwidth reservation for the signaling flow of the NGN service, and the signaling of the NGN service is not blocked in the network according to the highest priority. Pass without loss.
  • the present invention is mainly directed to an NGN network using an all-IP bearer, and the structure of the network is schematically shown in FIG. 1.
  • the user premises equipment When the NGN network transmits the information flow, in the uplink direction, the user premises equipment sends the information flow to the IP access network through the resident gateway and the access node in the IP access network; the EP access network passes its own aggregation node and edge.
  • the node sends the information flow to the boundary node in the core network; the boundary node in the IP core network sends the information flow to the distributed IP value-added service subsystem or other boundary nodes as needed.
  • the IP core network sends the information flow of the IP value-added service subsystem or other border nodes to the IP access network; the IP access network sends the information flow to its own access node through its own aggregation node and edge node. And transmitting the information flow to the resident gateway of the customer premises equipment through the access node.
  • the solution of the present invention first allocates a channel dedicated to signaling flow for the signaling flow in the information flow on the entire transmission path, and reserves enough for the channel. The bandwidth can then be transmitted over the channel.
  • the uplink transmission of the signaling flow by the solution of the present invention can implement signaling flow transmission through the process shown in FIG. 2, which corresponds to the following steps:
  • Step 201 Set a signaling channel for signaling flow transmission in the NGN, and reserve bandwidth for the signaling channel.
  • the access network signaling channel is set in the IP access network and the core network signaling channel is set in the IP core network.
  • the set signaling channel can be implemented by using VC and VLAN technologies.
  • the set signaling channel can be implemented by using a dedicated VPN technology.
  • bandwidth is reserved for the set signaling channel. If there is no signaling flow currently, other information flows may occupy the bandwidth resource. However, if there is currently a signaling flow to be transmitted, the reserved bandwidth may be used to ensure the transmission of the signaling flow.
  • Step 202 The IP access network transmits the signaling flow in the user traffic sent by the sending end according to the highest priority, through the set signaling channel, to the DP core network.
  • the resident gateway can generally be regarded as the sender.
  • the IP access network transport signaling flow includes the following processes:
  • the transmission of the signaling stream is performed by an access node connected to the resident gateway.
  • the signaling flow is first obtained. There are two cases: If the signaling channel set in the IP access network does not include the letter between the resident gateway and the access node The signaling channel is not set between the channel, that is, the resident gateway and the access node. In this case, the access node in the DP access network should have IP capability, and the access node should be separated from the user traffic. Signaling flow; if a signaling channel is set between the resident gateway and the access node, in this case, the signaling flow can be separated from the user traffic by the resident gateway, and the signaling flow is passed according to the highest priority. The access network signaling is sent to the access node, and the access node obtains the signaling flow according to the identifier of the access network signaling channel.
  • the packet needs to carry the identification information that can identify the packet as a signaling packet, and the identification information is called a signaling identifier. information.
  • the signaling identifier information may be a fixed port number and a protocol number. If the corresponding NGN service proxy device exists, the signaling identifier information may also be a destination address of the NGN service proxy device.
  • the access node After acquiring the signaling flow, the access node sends the signaling flow to the sink node through the access network signaling channel according to the highest priority.
  • the aggregation node obtains the signaling flow according to the identifier of the access network signaling channel, and sends the signaling flow to the edge node through the access network signaling channel according to the highest priority.
  • the edge node sends the signaling stream to the border node in the IP core network.
  • the signaling channel between the edge node in the IP access network and the border node in the IP core network may be an access network signaling channel, or may be a core network signaling channel, and edge nodes and boundary nodes may also appear.
  • the transmission processing of different cases is also different. Specifically, if it is the first case, it is often because the border node in the DP core network supports VC or VLAN. In this case, the edge node in the BP access network is based on the access network signaling channel.
  • the identifier, the signaling flow in the channel is forwarded to the boundary node of the IP core network through the access network signaling channel according to the highest priority. If it is the second case, it is often because the edge node in the IP access network supports the VPN. In this case, the edge node in the IP access network according to the identifier of the access network signaling channel, the channel The signaling flow in the network is sent to the boundary node of the IP core network through the core network signaling through the highest priority. If it is the third case, the border node in the DP core network can directly obtain the signaling flow according to the identifier of the access network signaling channel.
  • Step 203 The IP core network transmits the signaling flow transmitted by the signaling channel in the IP access network through the signaling channel to the receiving end.
  • the receiving end is an EP value-added service subsystem.
  • the IP core network can directly send the signaling flow in the channel to the IP value-added service subsystem according to the highest priority through the core network signaling channel according to the identifier of the signaling channel.
  • Step 301 Set a signaling channel for signaling flow transmission in the NGN, and reserve bandwidth for the signaling channel.
  • the processing of setting the signaling channel is the same as the uplink transmission process, and therefore will not be described.
  • Step 302 The DP core network sends the signaling flow in the user traffic sent by the sending end according to the highest Priority, transmitted through the set signaling channel until the IP access network.
  • the transmitting end is an IP value-added service subsystem.
  • the IP core network first separates the signaling flow from the user traffic through the border node directly connected to the subsystem, and then passes the separated signaling flow according to the highest priority through the border node. Forwarding through the core network signaling channel until
  • the border node of the IP access network connection and then the border node sends the signaling flow to the IP access network. If other nodes need to be passed in the process of forwarding to the border node, the nodes also obtain the signaling flow according to the identifier of the signaling channel, and then forward the signaling flow through the signaling channel according to the highest priority.
  • the boundary node and the edge node may be the core network signaling channel or the access network signaling channel.
  • the boundary node and the edge node may also be the same node. If it is the first case, the border node sends the signaling flow to the edge node of the BP access network through the core network signaling channel. If there are two cases, the border node will pass the access network signaling channel. The signaling stream is sent to the edge node of the ⁇ >access network.
  • Step 303 The IP access network transmits the signaling flow transmitted by the signaling channel in the IP core network through the access network signaling channel to the corresponding receiving end.
  • the forwarding process is forwarded by the edge node in the IP access network to the aggregation node through the access network signaling channel according to the highest priority; the aggregation node also uses the forwarding method to forward the signaling flow to the edge node. Into the node.
  • the receiving end should generally be a resident gateway. If a signaling channel is provided between the access node and the resident gateway, the access node also forwards the signaling flow to the resident gateway by using the foregoing forwarding method. If no signaling channel is provided, the access node may only follow the highest priority. The signaling flow is forwarded to the premises gateway. Through the above steps, the forwarding of the signaling flow in the downlink direction is completed.
  • the signaling flow with the destination address being the NGN service proxy device may also be The default configuration on NAT and/or firewall is allowed to pass.
  • NAT address translation device
  • Signaling monitoring and filtering functions may also be set at the customer premises gateway, the access network edge router, and the NGN service proxy device due to possible malicious attacks on the set signaling channel.
  • this signaling monitoring and filtering function can also be set at the access node.
  • the device that is configured with the monitoring and filtering function can monitor the IP packet according to the packet header information of the IP packet. If the EP packet is determined to be an illegal packet, the IP packet may be an illegal packet. The message can be discarded.
  • the following solution may also be adopted to implement the transmission of the media stream of the NGN service.
  • the corresponding channel is also set first, mainly in the remaining resources of the NGN after the signaling channel is reserved for the signaling flow, and the media channel is divided into media channels.
  • the set media channel includes an access network media channel in the IP access network and a core network media channel in the IP core network.
  • the access network media channel can be divided by VC and VLAN technologies, and the core network media channel can be divided by VPN.
  • the media channel setting is different from the signaling channel in that it does not need to reserve bandwidth for the media channel.
  • the reason for this setting is to prevent resource inversion.
  • the media channel can also be configured in multiple types, each corresponding to a different priority, so that the IP access network and the IP core network transmit different media streams according to the priority.
  • the IP access network and the DP core network can transmit the media stream in the uplink direction and the downlink direction through the media channel.
  • the transmission process is basically the same as the signaling flow
  • the transmission process is the same, except that if there are multiple media channels, the forwarding nodes in the IP access network and the IP core network can set different priorities for the identifiers of the media channels, and then follow the priority to the media channels.
  • the media stream in the middle is forwarded.
  • the correspondence between the logo and the priority should be preset.
  • the resource and admission control device may also determine the media stream according to the user's request, the request of the agent of the NGN service, the quality of service parameter of the user subscription, etc., and by checking the availability of the network resource. Admission or not, and a quality of service level tag of the media stream, the service quality level flag includes information such as a forwarding priority and a drop priority, and then the IP packet header identification information of the media stream, the media stream admission.
  • the information of the service and the service quality level are sent to the forwarding gateway of the user at the edge of the network domain, such as the edge gateway in the IP access network and the border node in the IP core network. If the access node in the IP access network has the IP capability, the resource and the admission control device can also send the information to the access node through the command.
  • the forwarding node at the edge of the network domain should first deliver the media stream according to the IP packet header information of the media stream and deliver the packet according to the resource and the admission control device.
  • the command determines whether the media stream is admitted. If yes, the service quality level flag carried in the command is set for the media stream, and is transmitted through the media channel; otherwise, the media stream is directly filtered, that is, the discard is discarded. Media stream.
  • the resource and admission control equipment When checking the availability of network resources, the resource and admission control equipment should also ensure the absolute quality of service marked as the highest priority traffic based on the detection data and traffic engineering data, and try to avoid congestion at any node in the network. If the network resource fails to obtain the line check failure, the media stream of the NGN service can reduce the quality of service level requirement and obtain the network resource with lower quality of service when the network resource of the high-quality service quality cannot be obtained. For example, when the resource and the admission control device determine that the media stream cannot be admitted, the reason code that cannot be admitted is returned to the device that initiates the resource request, and the device that initiates the resource request is received. After the reason code, a resource of a lower quality of service level is requested for the media stream. Certainly, the device that initiates the resource request may directly reject the user service request corresponding to the media stream after receiving the reason code.
  • the NGN service proxy device If the NAT and/or firewall device is deployed in the network, and the NGN service proxy device only has the signaling proxy function, the NGN service proxy device sends a command to control the NAT and/or the firewall device when processing the signaling flow. Media stream traversal and address translation. If the NGN service proxy device has both the signaling proxy function and the media proxy function, the NAT and the firewall device can be configured so that the NAT and the firewall device set the destination address to the signaling message and the media packet of the NGN service proxy device. Both are set to allow pass by default.
  • the NGN service proxy device may send the identifier of the media stream, the original encoding algorithm, and the converted encoding algorithm to the ingress node and the egress node of the media stream transmission path, and the ingress node determines the media stream according to the channel identifier, and uses the conversion
  • the subsequent encoding algorithm converts the media stream; the egress node determines the media stream according to the channel identifier, and converts the media stream by using an original encoding algorithm.
  • the media stream can be transmitted on the basis of reliable signaling flow, and the phenomenon of resource inversion does not occur.
  • the resource and admission control device preferentially processes the resource request from the emergency call service system, and determines the media stream corresponding to the emergency call service. For highest priority and service level traffic. Resources with the highest priority and service level traffic are no longer available And the admission control device can release the resources of the non-emergency service, or reduce the quality of service level of the non-emergency service, and use the released resources for a certain stream of the 7

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Description

一种实现下一代网络中信息流传输的方法 技术领域
本发明涉及下一代网络（NGN )技术领域， 更确切地说是涉及一种 实现 NGN中信息流传输的方法。 发明背景
在任何一种网络中， 用户都希望能够又快又高质量地通过网络实现 业务传输。 对于 NGN来说, 同样如此。 NGN是釆用 IP之类的分组技 术作为承载网技术来融合固定通信和移动通信， 并通过通信实体之间的 IP连接性来承载语音、 图像和数据等多种电信业务的融合网络。 目前， 针对 NGN已提出了业务可达性要求，也即要求无论 NGN采用的是何种 接入技术， 用户都可以随时按需获得所预订的 NGN业务。
要想实现业务可达性， 则必须保证 NGN业务的信令流时刻畅通和 可靠传递。在 NGN中的 IP接入网上，用户发出的所有 IP报文以尽力或 以优先級方式向前传递， 并且 NGN业务的信令流和媒体流混合传递。 由于网络带宽永远是有限的， 当用户与业务控制功能实体之间的任何一 段网络带宽或一个节点满负荷或发生拥塞时， NGN业务的信令流可能会 被丢弃， 不能到达业务控制功能实体， 其中， 该 NGN业务的信令流中 包含 户的业务请求信令报文。 因此， 即使用户请求的是优先级较高的 业务， 也会出现无法得到应答的情况， 从而无法实现业务可达性。
并且， 在 NGN业务的信令流和媒体流混合传递的情况下， IP网络 传送节点难以区分所传递报文是信令流报文还是媒体流报文， 在拥塞发 生时无法保证 NGN业务的信令流报文不被丟弃， 这种情况下显然也无 法实现业务可达性了。
用户请求的业务还可能是高优先级的紧急呼叫业务，如匪警、火警、 交警及医疗救助等电话业务， 这些业务采用公众熟悉的统一号码， 并要 求 24小时保持通畅， 且每个电话用户都有权拨打紧急电话以寻求帮助。 这类业务不但要求保证业务的信令流时刻畅通和可靠传递， 还要求保证 媒体流的随时建立和可靠传递。 而如果信令流不能可靠地到达业务控制 实体， 则应用会话无法建立， 媒体流也就无法开始， 更不用说支持紧急 呼叫业务和保证媒体流的传送服务质量了。
另外， 为了解决地址、 安全和服务质量的问题， NGN承载网中可能 会部署网络地址转换（NAT )设备以及防火墙设备之类的安全设备， 并 部署针对媒体流、 且由业务控制实体实施的准入控制。 由于业务信令协 议的多样性， 应以简单可靠的方式保证 GN业务信令流能穿越这些安 全设备， 最终到达业务控制实体。 如果 NGN业务的信令流无法到达业 务控制实体， 则无法通过业务请求触发对媒体流的准入控制。
以上对 NGN存在的主要问题作了一些说明， 下面再对目前已建设 的 NGN中存在的另一些问题进行说明。
目前已建设的 NGN主要面向语音业务的分組化， 采用 IP物理专网 来承载语音业务， 数据业务则仍采用原有的 Internet 网络承载。 也就是 说， 传统的电话终端仍然通过普通电话线接入到语音网关设备， 电脑设 备则通过数字用户线（xDSL )和以太网接入到宽带接入服务器。 这样， 语音业务和数据业务从用户端开始就是相互隔离的， 而承载语音业务的 IP专网规划了足够的冗余带宽以避免拥塞发生，从而保证了语音业务的 信令流和媒体流传递的可靠性。 因此这种 NGN语音业务的 EP专网方案 不但保证了用户对 NGN语音业务的可达性，还可以支持紧急呼叫业务。
虽然上述 NGN语音业务的 IP专网方案保证了语音业务的传输， 而 NGN的最终目标是用一个全 IP网络承载所有的 NGN业务， 即承载所 有的 IP增值业务， 这些业务包括语音业务、视频业务及数据业务。 随着 NGN业务类型的丰富，语音业务流量在 NGN业务总量中的份额会很小， 并且逐渐下降， 因此运营商还需要考虑其他业务的传输性能， 而如果对 所有 NGN业务都采用 IP物理专网来承载， 则会出现以下缺点：
1 )由于 IP物理专网的运营和维护成^艮高，从而导致 NGN的运营 和维护成本 ^高；
2 )由于每个 EP专网都要设置一定的资源冗余,这就会造成整个 NGN 资源的冗余浪费非常严重；
3 )由于是采用专网传输不同的业务，显然就无法向多媒体终端用户 提供综合的 IP多媒体业务， 并且 IP专网目前还无法保证业务的传输质 量。
目前的 GN方案还有另一种趋势，就是 NGN接入网和核心网正在 逐步 IP化，在一个全 IP承载网中，用户与网络的通用接口采用 IP技术， 语音、 视频和数据业务通过 EP技术实现端到端的传递。 本质上， NGN 业务是指可运营可管理的电信级 Π>增值业务， 为保证 G 业务的实时 性， 以及高优先级业务的服务质量， 可以采用预先规划配置方式对 IP 网络资源进行逻辑分割， 不同的逻辑承载不同的业务。 比如， 在接入网 和核心网中隔离语音、视频和数据业务，并为这几种业务分别预留带宽， 其中， 可以在接入网中通过永久虚链路（PVC )或虚拟局域网 （VLAN ) 技术对这几种业务进行隔离并预留带宽, 在核心网中釆用多协议标签交 换（MPLS ) VPN进行隔离并预留带宽； 在网络边缘入口进行准入门控 制， 并将不同的业务媒体流标记为不同的转发优先级和丟包优先级向前 传递。 通过这种设置， 从而保证不同业务类型的路由和带宽占用互不干 扰。 但这种 NGN方案中业务的信令流和媒体流在逻辑网中仍然是混合 传递， 并且只保证了标记为最高优先级业务的信令流和媒体流在任何资 源占用率下的畅通无阻和可靠传递。 即使考虑到为信令流单独预留带 宽， 也只是为 NGN语音业务的信令流划分了逻辑承载网和预留带宽， 并没有统一考虑其他 NGN业务的信令流的隔离。 实际上， 电信运营商 应保证用户所预订的所有 NGN业务的信令流畅通无阻和可靠传递， 无 论该业务的媒体流属于哪种服务等級或类别。 而业界在讨论 GN服务 质量问题时， 并没有意识到对于所有电信级业务来说， 首先要保证业务 的可达性， 即所有电信级业务的信令流在任何资源占用情况下的畅通无 阻和可靠传递。 业界也没有意识到这是触发 NGN资源和准入控制功能 实体发挥作用的首要条件， 也是 NGN中支持紧急呼叫的首要条件。
具体来说， 后一种 NGN方案虽然通过预先规划配置的带宽预留， 可以保证在业务量规划范围内的业务服务质量，使网络资源利用率比 IP 专网方案有所提高， 但仍存在以下缺点：
1 )由于仍然是将 NG 业务的信令流和媒体流在逻辑网中混合传递， 因此同样不能保证较低优先级的业务以及免费的尽力传送业务的信令 流在任何资源占有率情况下的畅通无阻和可靠传递， 从而无法保证较低 优先级业务以及尽力业务的业务可达性， 也就无法保证由业务请求触发 对媒体流的准入控制发挥作用。
2 )在信令流畅通的情况下, 为高优先级业务预留的资源即使存在大 量空闲, 却不能被较低优先级的业务占用， 但却可以被免费的尽力传送 业务占用， 这就造成了资源倒挂现象, 即： 当网络有空闲资源时， 购买 了较低优先级服务的业务可能得不到资源， 而免费的尽力传送业务却有 可能获得资源， 虽然该尽力传送业务所占用的资源可能会被高优先级业 务抢占。 3 )不能提高媒体流的抗时延、 抗抖动及抗丟包等能力。
综上所述， 目前的 NGN方案都无法保证所有 NGN业务的信令流时 刻畅通和可靠传递， 从而无法实现业务可达性。 而 NGN业务的信令流 无法到达业务控制实体， 也就无法进行媒体流的传输 , 从而无法实现紧 急呼叫业务， 并且也无法触发对媒体流的准入控制。 发明内容
有鉴于此， 本发明所要解决的主要问题在于提供一种实现下一代网 络（NGN ) 中信息流传输的方法， 以保证 NGN业务的信令流时刻畅通 和可靠传递。
本发明还进一步提供了 NGN业务的媒体流的传输方法。
本发明还进一步针对 NGN业务的媒体流提供了资源和准入控制方 法。
本发明还进一步提供了 NGN中保证紧急呼叫业务可靠传输的方法。 本发明的技术方案如下: 一种实现 GN 中信息流传输的方法， 在
NGN中设置用于传输 NGN业务的信令流的信令通道, 并为该信令通道 预留带宽；
该方法进一步包括： 发送端将用户流量中 NGN业务的信令流按照 最高优先级通过所设置的信令通道进行传输， 直至接收端。
所述 NGN包括 IP接入网、 IP核心网和 NGN业务子系统； 所述在 NGN中设置信令通道为： 在 EP接入网中设置用于传输信令 流的接入网信令通道，并在 IP核心网中设置用于传输信令流的核心网信 令通道；
所述发送端将用户流量中 NGN业务的信令流通过设置的信令通道 传输至接收端， 包括以下步骤： al. IP接入网将发送端发送的用户流量中 NGN业务的信令流通过设 置的接入网信令通道进行传输， 直至 IP核心网； .
bl. IP核心网将 ΓΡ接入网中通过信令通道传输来的信令流再通过核 心网信令通道进行传输， 直至相应的接收端。
所述步驟 a包括：
all. IP接入网中的接入节点识别和分离出用户流量中 NGN业务的 信令流 , 并将该信令流按照最高优先级通过接入网信令通道传输至汇聚 节点；
al2. 汇聚节点根据接入网信令通道的标识， 将该通道中的信令流按 照最高优先级通过接入网信令通道进行转发， 直至边缘节点；
al3. 所述边缘节点将该信令流发送到 IP核心网中的边界节点。 所述信令流的 IP报文头信息中包括能够标识该报文为 NGN业务的 信令报文的信令标识信息，所述信令标识信息为： 固定端口号和协议号， 或指向 NGN业务代理设备的目的地址；
所述步驟 all中， 所述 IP接入网中的接入节点识别和分离出用户流 量中 NGN业务的信令流， 具体为： 根据信令报文中的信令标识信息从 用户流量中识别和分离出 NGN业务的信令才艮文。
所述信令流的 IP报文头信息中包括能够标识该报文为 NGN业务的 信令报文的信令标识信息，所述信令标识信息为： 固定端口号和协议号， 或指向 NGN业务代理设备的目的地址；
该方法进一步包括: 在 GN用户的驻地网关与 IP接入网的接入节 点之间预先设置用于信令传输的信令通道； 所述驻地网关根据信令报文 中的信令标识信息从用户流量中识别和分离出 NGN业务的信令报文， 并将该信令报文按最高优先级通过所述信令通道发送到 IP接入网的接 入节点； 所述步驟 all中，所述 IP接入网中的接入节点识别和分离出用户流 量中的 NGN业务的信令流， 具体为： 根据所述信令通道的标识识别和 分离出该通道中传输的信令流。
所述接收端为 NGN业务子系统；
所述步驟 b包括： 边界节点根据信令通道的标识， 将该通道中的信 令流按照最高优先级通过核心网信令通道发送到 NGN业务子系统。
所述 NGN包括 IP接入网、 IP核心网和 NGN业务子系统； 所述在 NGN中设置信令通道为： 在 IP接入网中设置用于传输信令 流的接入网信令通道，并在 IP核心网中设置用于传输信令流的核心网信 令通道；
所述发送端将用户流量中的信令流通过设置的信令通道传输至接收 端， 包括以下步骤：
a2、 IP核心网将发送端发送的用户流量中的信令流通过设置的核心 网信令通道进行传输， 直至 IP接入网；
b2、 IP接入网将 IP核心网中通过信令通道传输来的信令流再通过接 入网信令通道进行传输， 并通过接入节点将信令流传输至相应的接收 端。
所述发送端为 NGN业务子系统；
所述步驟 a2包括： 与 NGN业务子系统直接连接的边界节点从用户 流量中识别和分离出 NGN业务的信令流， 并将该信令流按照最高优先 級通过核心网信令通道进行转发，直至与 Π>接入网连接的边界节点； 所 述与 IP接入网连接的边界节点将信令流发送到 IP接入网。
所述步骤 b2中， 所述 IP接入网通过接入网信令通道传输信令流包 括：
b21、 IP接入网中的边缘节点将 IP核心网发送来的信令流按照最高 优先级， 通过接入网信令通道进行转发， 直至 IP接入网的汇聚节点； b22、汇聚节点根据接入网信令通道的标识，将该通道中的信令流按 照最高优先级再通过接入网信令通道进行转发，直至 EP接入网的接入节 点。
所述 NGN中进一步包括网络安全设备和 /或地址转换设备， 所述信 令流的目的地址或源地址为 NGN业务代理设备；
该方法进一步包括： 将所述网络安全设备和 /或地址转换设备缺省配 置为允许目的地址或源地址为 NGN业务代理设备的信令流通过。
该方法可以进一步包括: 在 NGN预留信令通道后的网络剩余传送 资源中， 为 NGN业务的媒体流设置用于传输媒体流的媒体通道， 且在 所设置的媒体通道为一条以上时， 为不同媒体通道设置不同优先等级； 发送端将用户流量中的媒体流通过所设置的媒体通道进行传输， 直至接 收端。
所述在 NGN中为媒体流设置媒体通道为： 在 IP接入网中设置用于 传输媒体流的接入网媒体通道 ,并在 IP核心网中设置用于传输媒体流的 核心网媒体通道；
所述发送端将用户流量中的媒体流通过设置的媒体通道传输至接收 端， 包括以下步骤：
Al、 IP接入网将发送端发送的用户流量中的媒体流通过接入网媒体 通道转发至 IP核心网；
Bl、 IP核心网将所述媒体流通过核心网媒体通道进行转发， 并将所 述媒体流发送至接收端。
所述在 NGN中为媒体流设置媒体通道为： 在 IP接入网中设置用于 传输媒体流的接入网媒体通道，并在 IP核心网中设置用于传输媒体流的 核心网媒体通道； 所述发送端将用户流量中的媒体流通过设置的媒体通道传输至接收 端， 包括以下步骤:
A2、 IP核心网将发送端发送的用户流量中的媒体流通过核心网媒体 通道转发至 CP接入网；
B2、 IP接入网将所述媒体流通过接入网媒体通道进行转发, 并将所 述媒体流发送至接收端。
该方法还可以进一步包括： 由资源和准入控制设备判断媒体流是否 准入，并确定准入的媒体流的服务质量等级，之后将媒体流的标识信息、 所确定的准入及服务质量等级信息发送到 NGN中位于网络边缘的转发 节点予以执行；
所述 IP接入网和 IP核心网在对媒体流通过媒体通道进行转发之前 , 进一步包括： 由位于网络边缘的转发节点根据该媒体流的标识及准入信 息确定相应的媒体流是否允许进入网络， 并按照服务质量等级信息对准 入的媒体流进行转发。
该方法还可以进一步包括: 所述资源和准入控制设备在确定媒体流 不能准入时， 将不能准入的原因码返回给发起资源请求的设备; 发起资 源请求的设备在收到所述原因码后， 为该媒体流请求更低服务质量等级 的资源， 或拒绝该媒体流所对应的用户业务请求。
所述传输的媒体流为紧急呼叫业务的媒体流;
该方法进一步包括： 由资源和准入控制设备将所述紧急呼叫业务的 媒体流确定为最高优先级和服务盾量等级， 将该媒体流的准入及最高优 先级和服务质量等级信息发送给位于网络边缘的转发节点予以执行 , 并 判断最高优先级资源是否存在空闲， 如果是， 则不再执行其他处理； 否 则， 幹放其它非紧急业务的媒体流所占用的资源或者降低其他非紧急业 务的媒体流的服务质量等級， 并将所 #放的资源用于传送所述紧急呼叫 业务的媒体流。
所述 NGN中进一步包括网络安全设备和 /或地址转换设备， 所述信 令流的目的地址或源地址为 NGN业务代理设备;
所述 NGN业务代理设备只具有信令代理功能 , 则该方法进一步包 括： 由 NGN业务代理设备在处理信令流时, 下发命令来控制网絡安全 设备和 /或地址转换设备， 网络安全设备和 /或地址转换设备根据所述命 令对媒体流进行相应的安全或地址转换处理;
所述 NGN业务代理设备或者同时具有信令代理功能及媒体代理功 能， 则该方法进一步包括： 将所述网络安全设备和 /或地址转换设备缺省 配置为允许目的地址或源地址为 NGN业务代理设备的信令流及媒体流 通过。
该方法还可以进一步包括: 网络域中传输媒体流的入口节点将所述 媒体流转换编码方式， 并将媒体流按照转换后的编码方式进行转发， 出 口节点将接收到的媒体流转换为原有的编码方式, 并将媒体流按照原有 的编码方式进行转发。
本发明方案通过为信令流设置信令通道，并为该信令通道预留带宽， 从而保证了信令流的时刻畅通和可靠传递 , 为实现业务可达性提供了信 令流传输方面的保证。
本发明方案还通过在 NAT和 /或防火墙设备中缺省配置允许通过信 令流， 从而进一步保证了信令流的可靠传输。
本发明方案还通过在网络域的转发节点设置信令监测和过滤功能 , 保证了信令通道的安全传输。
本发明进一步提供了为媒体流设置媒体通道， 并为不同的媒体通道 设置不同优先级的媒体流传输方案 , 使得在实现媒体流传输的同时， 还 不会出现现有技术中可能存在的资源倒挂现象, 保证了用户定购业务的 传输。
针对媒体流传输， 本发明方案还进一步提供了在 NAT和 /或防火墙 设备中缺省设置允许通过媒体流， 从而进一步保证了媒体流的可靠传 输。
本发明方案还针对媒体流传输提供了编码转换功能， 在网络入口转 换为服务质量更好的编码， 在网络出口再将其恢复为原有的编码， 从而 增强了媒体流的抗时延、 抗抖动和抗丢包的能力。
本发明方案还通过在网络域边缘的转发节点上设置媒体流过滤功 能， 将可疑的媒体流过滤掉， 从而防止了 NGN业务子系统受到攻击。
本发明方案还提供了由资源和准入控制设备将紧急呼叫业务的媒体 流确定为最高优先级和最高服务质量等级, 并控制网络转发节点予以执 行的方案， 且在最高优先级和服务质量等级的传输资源已无空闲的情况 下， 释放非紧急业务的资源或降低非紧急业务的服务质量等级， 并将释 放的资源用于紧急呼叫业务的媒体流传输 , 从而保证了紧急呼叫业务的 可靠传输。 附图简要说明
图 1为全 ΓΡ承载的 NGN网络的结构示意图；
图 2为本发明方案中上行方向上的信令流传输流程图；
图 3为本发明方案中下行方向上的信令流传输流程图。 实施本发明的方式
为保证 NGN网络中的业务可达性，本发明方案主要是为 NGN业务 的信令流始终维持足够的带宽预留， 并将 NGN业务的信令报文按最高 优先级在网络中无阻塞、 无丢包地传递。 本发明主要是针对采用全 IP承载的 NGN网络， 该网络的结构示意 如图 1所示。
NGN网络在传输信息流时， 在上行方向上， 用户驻地设备通过驻地 网关以及 IP接入网中的接入节点将信息流发送到 IP接入网； EP接入网 通过自身的汇聚节点和边缘节点将该信息流发送到 Π>核心网中的边界 节点； IP核心网中的边界节点再根据需要， 将信息流发送到分布的 IP 增值业务子系统， 或者是其他的边界节点。
在下行方向上， IP核心网将 IP增值业务子系统或者其他边界节点的 信息流发送到 IP接入网； IP接入网通过自身的汇聚节点和边缘节点将 该信息流发送到自身的接入节点， 并通过该接入节点将信息流发送到用 户驻地设备的驻地网关。
基于图 1所示的 NGN以及当前的传输信息流方式， 本发明方案首 先在整个传输路径上为信息流中的信令流分配专门用于信令流传递的 通道， 并为该通道预留足够的带宽, 之后即可在该通道上传输信令流。
由于信息流传输分上行和下行两个方向， 因此下面分别对上行和下 行两个方向的信令流传输进行描述。
具体来说， 本发明方案对信令流的上行传输可以通过图 2所示流程 实现信令流传输， 对应以下步驟：
步骤 201、在 NGN中设置用于信令流传输的信令通道, 并为该信令 通道预留带宽。
具体来说， 是分别在 IP接入网中设置接入网信令通道和在 IP核心 网中设置核心网信令通道。对于 IP接入网来说，所设置的信令通道可以 采用 VC和 VLAN技术实现， 对于 IP核心网来说， 所设置的信令通道 则可以采用专用 VPN技术实现。
之所以为所设置的信令通道预留带宽，是为了在后续的传输过程中， 如杲当前没有信令流， 则其他信息流可以占用该带宽资源， 但如果当前 有信令流需要传输， 则可以通过预留的带宽来保证信令流的传输。
步驟 202、 IP接入网将发送端发送的用户流量中的信令流按照最高 优先级， 通过所设置的信令通道进行传输， 直至 DP核心网。
上行方向上， 一般可以将驻地网关看作发送端。 具体来说， IP接入 网传输信令流包括以下几个过程：
首先， 由与驻地网关连接的接入节点进行信令流的传输。 接入节点 在进行信令流的传输之前 , 首先要获取该信令流, 具体有两种情况： 如 果在 IP接入网中设置的信令通道没有包括驻地网关与接入节点之间的 信令通道， 也即驻地网关与接入节点之间没有设置信令通道， 这种情况 下， DP接入网中的接入节点应该具有 IP能力， 应由该接入节点从用户 流量中分离出信令流； 如果驻地网关与接入节点之间设置了信令通道， 这种情况下， 则可以由驻地网关从用户流量中分离出信令流, 并将该信 令流按照最高优先级通过接入网信令通 送给接入节点， 接入节点则 才艮据接入网信令通道的标识获取信令流。
不管是由接入节点还是由驻地网关从用户流量中分离出信令流， 都 需要报文中携带能够标识该报文为信令报文的标识信息， 将这样的标识 信息称为信令标识信息。 该信令标识信息可以为固定端口号和协议号， 如果存在相应的 NGN业务代理设备，该信令标识信息还可以为 NGN业 务代理设备的目的地址。
其次， 接入节点在获取该信令流之后， 同样按照最高优先级将该信 令流再通过接入网信令通道发送到汇聚节点。
再次， 汇聚节点根据接入网信令通道的标识获取信令流， 并同样按 照最高优先级将该信令流再通过接入网信令通道发送到边缘节点。
最后，边缘节点再将该信令流发送给 IP核心网中的边界节点。其中， 由于 IP接入网中的边缘节点与 IP核心网中的边界节点之间的信令通道 可能是接入网信令通道， 也可能是核心网信令通道， 还有可能出现边缘 节点与边界节点为同一设备的情况， 不同情况的发送处理也不相同。 具 体来说，如果是第一种情况， 则往往是由于 DP核心网中的边界节点支持 VC或 VLAN的缘故， 这种情况下， BP接入网中的边缘节点根据接入网 信令通道的标识， 将该通道中的信令流按照最高优先级再通过接入网信 令通道转发到 IP核心网的边界节点。如果是第二种情况，则往往是由于 IP接入网中的边缘节点支持 VPN的缘故， 这种情况下， IP接入网中的 边缘节点根据接入网信令通道的标识， 将该通道中的信令流按照最高优 先级再通过核心网信令通 i½送到 IP核心网的边界节点。如果是第三种 情况，则 DP核心网中的边界节点可以直接根据接入网信令通道的标识获 取信令流了。
步骤 203、 IP核心网将 IP接入网中通过信令通道传输来的信令流再 通过信令通道进行传输, 直至接收端。
接收端为 EP增值业务子系统， IP核心网可以通过边界节点直接根据 信令通道的标识， 将该通道中的信令流按照最高优先级通过核心网信令 通道发送到 IP增值业务子系统。
通过上述步骤即可完成对上行信令流的无丢包转发。
下面再对信令流的下行传输过程进行说明 , 该过程如图 3所示， 对 应以下步骤：
步骤 301、在 NGN中设置用于信令流传输的信令通道, 并为该信令 通道预留带宽。
对于下行传输的过程来说， 其设置信令通道的处理与上行传输过程 相同， 因此不再赞述。
步驟 302、 DP核心网将发送端发送的用户流量中的信令流按照最高 优先级， 通过所设置的信令通道进行传输， 直至 IP接入网。
发送端为 IP增值业务子系统 , IP核心网首先通过与该子系统直接连 接的边界节点从用户流量中分离出信令流， 然后再通过该边界节点将分 离出的信令流按照最高优先级， 通过核心网信令通道进行转发， 直至与
IP接入网连接的边界节点， 再由该边界节点将信令流发送到 IP接入网。 如果在转发到边界节点的过程中还需要通过其他的节点， 则这些节点同 样是根据信令通道的标识获取信令流， 再将该信令流按照最高优先级通 过信令通道进行转发。
在由 IP核心网中的边界节点将信令流转发到 IP接入网的边缘节点 时， 该边界节点与边缘节点之间存在不同的关系， 即： 边界节点与边缘 节点之间的信令通道可能为核心网信令通道， 也可能为接入网信令通 道， 边界节点和边缘节点还可能是同一个节点。 如果是第一种情况， 则 边界节点会通过核心网信令通道将信令流发送给 BP接入网的边缘节点， 如果是笫二种情况， 则边界节点会通过接入网信令通道将信令流发送给 π>接入网的边缘节点， 如果是第三种情况， 则边缘节点可以直接获取从 核心网信令通道中该信令流。 ' 步驟 303、 IP接入网将 IP核心网中通过信令通道传输来的信令流再 通过接入网信令通道进行传输， 直至相应的接收端。
具体来说，该转发过程由 IP接入网中的边缘节点将信令流按照最高 优先级通过接入网信令通道转发到汇聚节点； 汇聚节点同样采用该转发 方法将信令流转发到接入节点。
该接收端一般应为驻地网关。 如果接入节点与驻地网关之间设有信 令通道， 则接入节点同样采用上述转发方法将信令流转发到驻地网关， 如果未设信令通道， 则接入节点可以只按照最高优先级将该信令流转发 到驻地网关。 通过上述步骤， 即完成了下行方向上对信令流的转发。
另外， 在上下行方向上对信令流的传输过程中， 如果 NGN 网络中 还部署了地址转换设备 ( NAT )和 /或防火墙设备， 则还可以将目的地址 为 NGN业务代理设备的信令流在 NAT和 /或防火墙上缺省配置为允许通 过。
由于可能会出现对所设置的信令通道的恶意攻击， 还可以在用户驻 地网关处、 接入网边缘路由器处以及 NGN业务代理设备处设置信令监 测和过滤功能， 当然， 如果接入节点具有 IP能力， 还可以在接入节点处 也设置该信令监测和过滤功能。 设置了该监测和过滤功能的设备可以根 据 IP报文的报文头信息对 IP报文进行监测，如果确定该 EP报文属于非 法报文， 或者认为该 IP报文可能是非法报文, 则可以丟弃该报文。
在通过上述方案对信令流设置信令通道后 , 为避免对媒体流传输时 容易出现的资源倒挂现象， 还可以采用下述方案实现对 NGN业务的媒 体流的传输。
该方案同样首先要设置相应的通道， 主要是在 NGN为信令流预留 信令通道后剩余的资源中， 为媒体流划分媒体通道。 具体来说， 所设置 的媒体通道包括在 IP接入网中的接入网媒体通道和在 IP核心网中的核 心网媒体通道。 接入网媒体通道可以是通过 VC和 VLAN技术划分， 核 心网媒体通道则可以是通过 VPN进行划分。
该媒体通道设置与信令通道不同的是， 不用为媒体通道预留带宽， 之所以这么设置， 就是为了防止资源倒挂现象。 另外， 媒体通道还可以 设置多种， 每种对应不同的优先级， 以便 IP接入网和 IP核心网根据优 先级对不同的媒体流进行传输。
在设置了媒体通道后， IP接入网和 DP核心网就可以通过该媒体通道 对媒体流进行上行方向和下行方向的传输了。 该传输过程基本与信令流 的传输过程相同， 所不同的是， 如果媒体通道有多个， IP接入网和 IP 核心网中的转发节点可以针对媒体通道的标识设置不同的优先级， 然后 再按照该优先级对媒体通道中的媒体流进行转发。 当然, 标识与优先级 的对应关系应该是预先设定好的。
另外， 对于媒体流来说， 资源和准入控制设备还可以根据用户的请 求、 NGN业务的代理的请求、用户预订的服务质量参数等， 并通过检查 网络资源的可获得性来决定媒体流的准入与否 , 以及媒体流的服务质量 等级标记， 该服务质量等级标记中包括转发优先级和丟弃优先级等信 息， 然后将该媒体流的 IP报文头标识信息、该媒体流准入与否的信息以 及服务质量等级标记通过命令下发给用户驻地网关、 IP接入网中的边缘 节点及 IP核心网中的边界节点等位于网络域边缘的转发节点。 如果 IP 接入网中的接入节点具有 IP能力，资源和准入控制设备还可以上述信息 通过命令下发给接入节点。
在设置了资源与准入控制设备的命令生成方式后, 位于网络域边缘 的转发节点在转发媒体流时，应首先根据媒体流的 IP报文头信息， 并根 据资源与准入控制设备下发的命令判断该媒体流是否准入， 如果是， 则 为该媒体流设置该命令中所携带的服务质量等级标记 , 并通过媒体通道 进行传输； 否则， 直接过滤掉该媒体流， 即丟弃该媒体流。
其中， 资源和准入控制设备在检查网络资源的可获得性时， 还应根 据检测数据和流量工程数据， 保证标记为最高优先级流量的绝对服务质 量， 并尽力避免网络中任何节点发生拥塞。 如果是因为网络资源可获得 行检查失败等原因， NGN业务的媒体流在不能获得高等级服务质量的网 络资源时， 可以降低服务质量等级需求， 以获得较低服务质量的网络资 源。 比如， 由资源和准入控制设备在确定媒体流不能准入时， 将不能准 入的原因码返回给发起资源请求的设备， 该发起资源请求的设备在收到 所述原因码后， 为该媒体流请求更低服务质量等级的资源。 当然， 该发 起资源请求的设备还可以在收到原因码后， 直接拒绝该媒体流所对应的 用户业务请求。
如果网络中部署了 NAT和 /或防火墙设备，且 NGN业务代理设备只 具备信令代理功能， 则 NGN业务代理设备在处理信令流时， 下发命令 来控制 NAT和 /或防火墙设备， 以实现媒体流的穿越和地址转换。 如果 NGN业务代理设备既具备信令代理功能，又具备媒体代理功能，则可以 对 NAT和防火墙设备进行设置， 使得 NAT和防火墙设备将目的地址为 NGN业务代理设备的信令报文和媒体报文都缺省设置为允许通过。
另外， 针对媒体流传输时容 出现时延、 抖动和丟包等问题， 还可 以在媒体流传输路径的相关节点上设置编码转换功能， 在网络入口将现 有的媒体流转换为服务盾量性能更好的编码， 在网络中对该编码进行传 输， 然后在网络出口将该编码再恢复为通信的发送端和接收端之间所协 商的编码, 以便通信的接收端能够识别所接收到的媒体流。 具体来说, 可以由 NGN业务代理设备将媒体流的标识、 原编码算法以及转换后的 编码算法发送给媒体流传输路径的入口节点和出口节点， 入口节点根据 通道标识确定媒体流， 并利用转换后的编码算法对该媒体流进行转换； 出口节点根据通道标识确定媒体流， 并利用原编码算法对该媒体流进行 转换。
通过上述过程即可实现在信令流可靠传递的基础上对媒体流的传 输， 并且不会出现资源倒挂的现象。
另外， 如果传输的是紧急呼叫业务， 那么对紧急呼叫业务的媒体流 进行传输时， 资源和准入控制设备优先处理来自緊急呼叫业务系统的资 源请求， 并将紧急呼叫业务所对应的媒体流确定为最高优先级和服务等 级流量。 在最高优先级和服务等级流量的资源已无空闲的情况下， 资源 和准入控制设备可以通过释放非紧急业务的资源， 或者是降低非紧急业 务的服务质量等级， 并将释放的资源用于 7|L载紧急呼叫业务的某体流。 从而实现了对紧急呼叫业务的媒体流的随时建立和可靠传递。
以上所述仅为本发明方案的较佳实施例 , 并不用以限定本发明的保 护范围。

Claims

权利要求书
1、一种实现下一代网络中信息流传输的方法 , 其特征在于， 在下一 代网络 NGN中设置用于传输 NGN业务的信令流的信令通道，并为该信 令通道预留带宽；
该方法进一步包括: 发送端将用户流量中 NGN业务的信令流按照 最高优先级通过所设置的信令通道进行传输， 直至接收端。
2、 根据权利要求 1所述的方法， 其特征在于， 所述 NGN包括 IP 接入网、 IP核心网和 NGN业务子系统；
所述在 NGN中设置信令通道为： 在 IP接入网中设置用于传输信令 流的接入网信令通道，并在 IP核心网中设置用于传输信令流的核心网信 令通道；
所述发送端将用户流量中 NGN业务的信令流通过设置的信令通道 传输至接收端， 包括以下步骤：
al . IP接入网将发送端发送的用户流量中 NGN业务的信令流通过设 置的接入网信令通道进行传输， 直至 IP核心网；
bl. IP核心网将 IP接入网中通过信令通道传输来的信令流再通过核 心网信令通道进行传输， 直至相应的接收端。
3、 根据权利要求 2所述的方法， 其特征在于， 所述步驟 a包括： all. IP接入网中的接入节点识别和分离出用户流量中 NGN业务的 信令流， 并将该信令流按照最高优先级通过接入网信令通道传输至汇聚 节点；
al2. 汇聚节点根据接入网信令通道的标识， 将该通道中的信令流按 照最高优先级通过接入网信令通道进行转发， 直至边缘节点；
al3. 所述边缘节点将该信令流发送到 IP核心网中的边界节点。
4、 根据权利要求 3所述的方法， 其特征在于， 所述信令流的 rp报 文头信息中包括能够标识该报文为 NGN业务的信令报文的信令标识信 息， 所述信令标识信息为： 固定端口号和协议号， 或指向 NGN业务代 理设备的目的地址；
所述步驟 all中，所述 IP接入网中的接入节点识别和分离出用户流 量中 NGN业务的信令流， 具体为： 根据信令报文中的信令标识信息从 用户流量中识别和分离出 NGN业务的信令报文。
5、 根据权利要求 3所述的方法， 其特征在于， 所述信令流的 IP报 文头信息中包括能够标识该报文为 NGN业务的信令报文的信令标识信 息， 所述信令标识信息为: 固定端口号和协议号， 或指向 NGN业务代 理设备的目的地址；
该方法进一步包括： 在 NGN用户的驻地网关与 IP接入网的接入节 点之间预先设置用于信令传输的信令通道； 所述驻地网关根据信令报文 中的信令标识信息从用户流量中识别和分离出 NGN业务的信令报文， 并将该信令报文按最高优先级通过所述信令通道发送到 Π>接入网的接 入节点；
所述步驟 all中，所述 BP接入网中的接入节点识别和分离出用户流 量中的 NGN业务的信令流， 具体为： ^据所述信令通道的标识识别和 分离出该通道中传输的信令流。
6、 根据权利要求 2所述的方法， 其特征在于， 所述接收端为 NGN 业务子系统；
所述步驟 b包括： 边界节点根据信令通道的标识 , 将该通道中的信 令流按照最高优先级通过核心网信令通道发送到 NGN业务子系统。
7、 根据权利要求 1所述的方法， 其特征在于， 所述 NGN包括 IP 接入网、 IP核心网和 NGN业务子系统； 所述在 G 中设置信令通道为： 在 DP接入网中设置用于传输信令 流的接入网信令通道，并在 IP核心网中设置用于传输信令流的核心网信 令通道；
所述发送端将用户流量中的信令流通过设置的信令通道传输至接收 端， 包括以下步骤：
a2、 IP核心网将发送端发送的用户流量中的信令流通过设置的核心 网信令通道进行传输， 直至 IP接入网;
b2、IP接入网将 IP核心网中通过信令通道传输来的信令流再通过接 入网信令通道进行传输， 并通过接入节点将信令流传输至相应的接收 端。
8、 根据权利要求 7所述的方法， 其特征在于， 所述发送端为 NGN 业务子系统；
所述步驟 a2包括： 与 GN业务子系统直接连接的边界节点从用户 流量中识别和分离出 NGN业务的信令流， 并将该信令流按照最高优先 级通过核心网信令通道进行转发 ,直至与 IP接入网连接的边界节点; 所 述与 IP接入网连接的边界节点将信令流发送到 EP接入网。
9、根据权利要求 7或 8所述的方法， 其特征在于， 所述步骤 b2中 , 所述 IP接入网通过接入网信令通道传输信令流包括：
b21、 IP接入网中的边缘节点将 IP核心网发送来的信令流按照最高 优先级， 通过接入网信令通道进行转发， 直至 IP接入网的汇聚节点； b22、汇聚节点根据接入网信令通道的标识，将该通道中的信令流按 照最高优先級再通过接入网信令通道进行转发，直至 IP接入网的接入节 点。
10、 根据权利要求 2所述的方法， 其特征在于， 所述 NGN中进一 步包括网络安全设备和 /或地址转换设备，所述信令流的目的地址或源地 址为 NGN业务代理设备；
该方法进一步包括：将所述网络安全设备和 /或地址转换设备缺省配 置为允许目的地址或源地址为 NGN业务代理设备的信令流通过。
11、根据权利要求 1所述的方法， 其特征在于， 该方法进一步包括： 在 NGN预留信令通道后的网络剩余传送资源中，为 NGN业务的媒体流 设置用于传输媒体流的媒体通道， 且在所设置的媒体通道为一条以上 时， 为不同媒体通道设置不同优先等级； 发送端将用户流量中的媒体流 通过所设置的媒体通道进行传输， 直至接收端。
12、 根据权利要求 11所述的方法， 其特征在于， 所述在 NGN中为 媒体流设置媒体通道为：在 IP接入网中设置用于传输媒体流的接入网媒 体通道， 并在 IP核心网中设置用于传输媒体流的核心网媒体通道; 所述发送端将用户流量中的媒体流通过设置的媒体通道传输至接收 端， 包括以下步骤：
Al、 IP接入网将发送端发送的用户流量中的媒体流通过接入网媒体 通道转发至 IP核心网；
Bl、 IP核心网将所述媒体流通过核心网媒体通道进行转发 , 并将所 述媒体流发送至接收端。
13、 根据权利要求 12所述的方法， 其特征在于， 所述在 NGN中为 媒体流设置媒体通道为：在 IP接入网中设置用于传输媒体流的接入网媒 体通道， 并在 IP核心网中设置用于传输媒体流的核心网媒体通道； 所述发送端将用户流量中的媒体流通过设置的媒体通道传输至接收 端， 包括以下步驟：
A2、 IP核心网将发送端发送的用户流量中的媒体流通过核心网媒体 通道转发至 IP接入网；
B2、 DP接入网将所述媒体流通过接入网媒体通道进行转发， 并将所 述媒体流发送至接收端。
14、 根据权利要求 12或 13所述的方法, 其特征在于， 该方法进一 步包括： 由资源和准入控制设备判断媒体流是否准入， 并确定准入的媒 体流的服务质量等级， 之后将媒体流的标识信息、 所确定的准入及服务 质量等级信息发送到 NGN中位于网络边缘的转发节点予以执行;
所述 IP接入网和 IP核心网在对媒体流通过媒体通道进行转发之前 , 进一步包括： 由位于网络边缘的转发节点根据该媒体流的标识及准入信 息确定相应的媒体流是否允许进入网絡， 并按照服务质量等级信息对准 入的媒体流进行转发。
15、根据权利要求 14所述的方法，其特征在于,该方法进一步包括: 所述资源和准入控制设备在确定媒体流不能准入时， 将不能准入的原因 码返回给发起资源请求的设备； 发起资源请求的设备在收到所述原因码 后， 为该媒体流请求更低服务质量等级的资源 , 或拒绝该媒体流所对应 的用户业务请求。
16、 根据权利要求 12或 13所述的方法， 其特征在于， 所述传输的 媒体流为紧急呼叫业务的媒体流;
该方法进一步包括： 由资源和准入控制设备将所述紧急呼叫业务的 媒体流确定为最高优先级和服务质量等级， 将该媒体流的准入及最高优 先级和服务质量等级信息发送给位于网絡边缘的转发节点予以执行， 并 判断最高优先级和服务质量等级资源是否存在空闲， 如果是， 则不再执 行其他处理； 否则， 释放其他非紧急业务的媒体流所占用的资源或者降 低其他非紧急业务的媒体流的服务质量等级， 并将所释放的资源用于传 送所述紧急呼叫业务的媒体流。
17、 根据权利要求 12或 13所述的方法， 其特征在于， 所述 NGN 中进一步包括网络安全设备和 /或地址转换设备，所述信令流的目的地址 或源地址为 NGN业务代理设备；
所述 NGN业务代理设备只具有信令代理功能 , 则该方法进一步包 括： 由 NGN业务代理设备在处理信令流时， 下发命令来控制网络安全 设备和 /或地址转换设备， 网络安全设备和 /或地址转换设备根据所述命 令对媒体流进行相应的安全或地址转换处理；
所述 NGN业务代理设备或者同时具有信令代理功能及媒体代理功 能， 则该方法进一步包括： 将所述网络安全设备和 /或地址转换设备缺省 配置为允许目的地址或源地址为 NGN业务代理设备的信令流及媒体流 通过。
18、 根据权利要求 12或 13所述的方法, 其特征在于， 该方法进一 步包括： 网络域中传输媒体流的入口节点将所述媒体流转换编码方式， 并将媒体流按照转换后的编码方式进行转发， 出口节点将接收到的媒体 流转换为原有的编码方式， 并将媒体流按照原有的编码方式进行转发。
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CN100499459C (zh) 2009-06-10
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EP1848149A1 (en) 2007-10-24
US7792985B2 (en) 2010-09-07
DE602005016727D1 (de) 2009-10-29
CN1825798A (zh) 2006-08-30
ATE443389T1 (de) 2009-10-15
US20080046565A1 (en) 2008-02-21

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