WO2009132559A1 - 一种均衡流量的方法、装置及系统 - Google Patents

一种均衡流量的方法、装置及系统 Download PDF

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Publication number
WO2009132559A1
WO2009132559A1 PCT/CN2009/071400 CN2009071400W WO2009132559A1 WO 2009132559 A1 WO2009132559 A1 WO 2009132559A1 CN 2009071400 W CN2009071400 W CN 2009071400W WO 2009132559 A1 WO2009132559 A1 WO 2009132559A1
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WO
WIPO (PCT)
Prior art keywords
atm
forwarding
packet
base station
dual
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PCT/CN2009/071400
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English (en)
French (fr)
Inventor
李亮
Original Assignee
华为技术有限公司
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Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2011506558A priority Critical patent/JP5230799B2/ja
Publication of WO2009132559A1 publication Critical patent/WO2009132559A1/zh
Priority to US12/916,186 priority patent/US8611226B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems 
    • H04L12/56Packet switching systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems 
    • H04L12/56Packet switching systems
    • H04L12/5601Transfer mode dependent, e.g. ATM
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic control in data switching networks
    • H04L47/10Flow control; Congestion control
    • H04L47/12Avoiding congestion; Recovering from congestion
    • H04L47/125Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems 
    • H04L12/56Packet switching systems
    • H04L12/5601Transfer mode dependent, e.g. ATM
    • H04L2012/5638Services, e.g. multimedia, GOS, QOS
    • H04L2012/5665Interaction of ATM with other protocols
    • H04L2012/5667IP over ATM
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2212/00Encapsulation of packets
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/12Shortest path evaluation
    • H04L45/125Shortest path evaluation based on throughput or bandwidth
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/68Pseudowire emulation, e.g. IETF WG PWE3

Definitions

  • the invention relates to a method, device and system for equalizing traffic.
  • the application is filed on April 29, 2008, the Chinese Patent Office, the application number is 200810094393.1, and the invention is entitled "A method, device and system for balancing flow”. Priority is hereby incorporated by reference in its entirety.
  • Embodiments of the present invention relate to the field of communications technologies, and in particular, to a method, device, and system for equalizing traffic. Background technique
  • 3G (3rd Generation, third-generation mobile communication) radio access network often uses a microwave or metro optical transmission network as a data transmission bridge between the base station and the base station controller.
  • the base station As the mainstream mobile operators in the industry, such as Vodafone and Orange, mainly operate on the microwave network and the fixed network operator transmission network, the base station first accesses through the microwave, and then passes through the leased metro optical transmission network. After the ground transmission, it finally converges into a high-speed link and is sent to the base station controller.
  • the traffic model since the base station does not reach the peak traffic at the same time, it can be considered to join the aggregation node at the first-level access point of the microwave.
  • the wireless service data is aggregated by packet switching to achieve bandwidth multiplexing. Therefore, the service aggregation gateway can significantly improve the efficiency of traffic reuse between base stations, thereby saving the cost of purchasing microwave equipment or renting metro optical transmission.
  • the ATM Hub networking method of the switch or dedicated device uses ATM switching and AAL2 (ATM Adaptation Layer 2) switching protocol to implement traffic aggregation to improve transmission efficiency;
  • An IP Hub networking method that implements traffic aggregation by using the IP (Internet Protocol) protocol of the router to improve transmission efficiency.
  • the IPoA IP over ATM, IP protocol is carried over the ATM network
  • IP protocol IP over ATM, IP protocol is carried over the ATM network
  • the standard IPo A protocol can realize the transmission of IP data streams on the ATM bearer network, that is, support the transmission of IP base station data streams on the ATM bearer network.
  • the networking scheme is shown in Figure 1.
  • the IP base station accesses the data stream to the ATM switch 1 through the access layer of the IP metropolitan area network, and finally aggregates to the IP interface provided by the ATM switch 1.
  • the ATM switch 1 pairs the accessed IP address.
  • the packet is encapsulated in the IPoA protocol.
  • the IP packet is encapsulated into a cell and transmitted on the ATM network ( Figure 1 shows the aggregation layer of the metro access network).
  • Figure 1 shows the aggregation layer of the metro access network.
  • the ATM switch 2 completes the reverse process of the ATM switch 1, reassembles the cell, and finally restores the payload of the IPoA bearer, that is, the IP packet.
  • FIG. 2 is a schematic diagram of a protocol stack bearer conversion in the prior art 1, as can be seen from the figure,
  • the ATM switch 1 and the ATM switch 2 actually use the tunnel on the ATM network, that is, the virtual channel of the ATM to carry the IP packet, so as to realize the transmission of the IP packet on the ATM bearer network.
  • IP packets need to be encapsulated and added to the IPoA to reduce the bearer efficiency.
  • the transmission efficiency is reduced because the encapsulation level is increased.
  • Edge-to-Edge, point-to-point pseudowire emulation technology which enables the transmission of ATM data streams over IP bearer networks.
  • the ATM base station accesses the data stream through the access layer of the ATM metropolitan area network to the PWE3 device 1, and the access side ATM network can adopt the IMA (Inverse Multiplexing).
  • IMA Inverse Multiplexing
  • E1/T1 ATM over E1/T1
  • SDH Synchronous Digital Hierarchy, synchronous digital transmission protocol
  • PWE3 device 1 pair The accessed ATM cells are encapsulated in the PWE3 protocol. After PWE3 encapsulation, the ATM cells are encapsulated into IP packets.
  • Line transmission (Fig. 3 shows the aggregation layer of the metro access network); PWE3 device 2 completes the reverse process of PWE3 device 1, and disassembles the received IP packet into a cell, and then sends it to the base station controller.
  • PWE3 device 1 and PWE3 device 2 actually use a tunnel on an IP network, that is, a pseudowire emulation of an IP network to carry an ATM cell. , thereby realizing the transmission of ATM cells on the IP bearer network.
  • the carrying efficiency is low. At the same time, because the package level is increased, the transmission efficiency is also reduced. More critical is:
  • Embodiments of the present invention provide a method, device, and system for equalizing traffic to improve transmission efficiency of a bearer network.
  • an embodiment of the present invention provides a method for equalizing traffic, including:
  • the relay node receives the service flow establishment request sent by the source node;
  • the relay node acquires link load information of each bearer network between the source node and the destination node according to the service flow chain establishment request, and selects a bearer network with a small link load to establish a forwarding link of the service flow;
  • the relay node forwards the service flow according to the forwarding link.
  • Another embodiment of the present invention provides a system for balancing traffic, including: a source node, a relay node, and a destination node;
  • the source node is configured to send a service flow and a service flow establishment request of the service flow; the relay node is configured to receive the service flow establishment request sent by the source node, according to the service flow.
  • the destination node is configured to receive the service flow forwarded by the relay node.
  • the embodiment of the invention further provides an apparatus for equalizing traffic, including:
  • a signaling receiving module configured to receive a service flow establishment request sent by the source node, and an acquiring module, configured to acquire link load information of each bearer network between the source node and the destination node according to the service flow establishment request;
  • a link selection module configured to select, according to the link load information of the bearer network, a forwarding link that establishes a service flow by using a bearer network with a small link load.
  • the embodiment of the invention further provides a method for converting an ATM protocol stack to an IP protocol stack, including:
  • the ATM cell When the forwarding link information indicates that the ATM cell is transmitted over the IP network, the ATM cell is encapsulated into an IP packet, and the "3 ⁇ 4 text" is forwarded to the ATM/IP dual-stack base station controller; or
  • the ATM cell is encapsulated into an IP packet according to the forwarding link information, and the IP packet is forwarded to the IP base station.
  • the embodiment of the invention further provides a method for converting an IP protocol stack to an ATM protocol stack, including:
  • the local forwarding table is searched according to the header information of the IP packet, and the forwarding link information of the IP packet is obtained.
  • the forwarding link information indicates that the IP packet is transmitted through the ATM network
  • the IP packet is encapsulated into an ATM cell, and the ATM/IP dual-stack base station controller is forwarded to the ATM/IP dual-stack base station controller.
  • Said ATM cell or,
  • the technical solution of the embodiment of the present invention has the following advantages: Through the admission control of the signaling plane, when the data flow is established, the signaling load is performed according to the link load information of the current bearer network.
  • the load sharing configuration of the data stream improves the utilization efficiency of the network; in addition, the relay node supports both ATM and IP networks, supports ATM and IP network standard protocols, and has high encapsulation efficiency and improves network bandwidth utilization; ATM-IP is adopted.
  • the conversion function between the standard protocols, the ATM/IP dual protocol stack device has high integration, which effectively saves the equipment purchase cost and the later maintenance cost.
  • FIG. 1 is a schematic diagram of an architecture of an IPoA protocol networking in the prior art
  • FIG. 2 is a schematic diagram of a protocol stack bearer conversion using the IPoA protocol networking in the prior art
  • FIG. 3 is a schematic diagram of an architecture of a PWE3 protocol networking in the prior art 2
  • FIG. 4 is a schematic diagram of a protocol stack bearer conversion using the PWE3 protocol networking in the prior art 2;
  • FIG. 5 is a schematic flowchart of a method for balancing traffic according to Embodiment 1 of the present invention
  • FIG. 6 is a schematic diagram of a system architecture of an ATM/IP carrier network according to an embodiment of the present invention
  • FIG. 7 is a method for balancing traffic according to Embodiment 2 of the present invention
  • FIG. 8 is a schematic flowchart of a method for equalizing traffic according to Embodiment 3 of the present invention
  • FIG. 9 is a schematic diagram of a protocol stack for converting an ATM cell into an IP bearer network according to an embodiment of the present invention
  • FIG. 10 is a schematic diagram of a protocol stack for converting an IP packet into an ATM bearer network according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of an apparatus for equalizing traffic according to Embodiment 4 of the present invention. detailed description
  • Embodiments of the present invention provide a method, device, and system for equalizing traffic.
  • the embodiment of the present invention is directed to a source node of a service flow and a relay node (for example, a gateway, and an ATM/IP dual stack Hub provided by the embodiment of the present invention), and/or at least two available bearer networks between the relay node and the destination node. Proposed.
  • a source node of a service flow for example, a gateway, and an ATM/IP dual stack Hub provided by the embodiment of the present invention
  • a relay node for example, a gateway, and an ATM/IP dual stack Hub provided by the embodiment of the present invention
  • a first embodiment of the present invention provides a method for equalizing traffic. As shown in FIG. 5, the relay node performs the following operations:
  • Step S501 The relay node receives a service flow establishment request sent by the source node.
  • Step S502 The relay node acquires link load information of each bearer network between the source node and the destination node according to the service flow establishment request, and selects a bearer network with a small link load to establish a forwarding link of the service flow. .
  • the method further includes: notifying the source node that the link establishment is successful; and saving the forwarding link information of the service flow Go to the local forwarding table.
  • Step S503 The relay node forwards the service flow according to the forwarding link.
  • Step S503.1 When receiving the service flow sent by the source node, the relay node searches the local forwarding table according to the header information of the service flow, and obtains the forwarding link information of the service flow.
  • Step S503.2 When the forwarding link information indicates that the ATM cell is transmitted through the IP network, the ATM cell is encapsulated into an IP packet, and the encapsulated IP packet is forwarded to the destination node (can be sent by using an IP route); Or
  • the forwarding link information indicates that the IP packet is transmitted through the ATM network
  • the IP packet is encapsulated into an ATM cell, and the encapsulated ATM cell is forwarded to the destination node (aggregation processing can be performed before being sent).
  • the relay node After the relay node obtains the forwarding link information of the service flow, when the forwarding link information of the relay node indicates: the ATM cell continues to transmit through the ATM network, or the IP packet continues to be transmitted through the IP network, according to the existing Process processing (select links to balance traffic Then implemented by the method of the embodiment of the invention).
  • the relay node when the relay node receives the de-linking request of the service flow, the relay node removes the forwarding link information of the service flow in the local forwarding table according to the de-linking request, and updates the local forwarding table.
  • the load balancing configuration of the data flow is performed according to the link load information of the current bearer network by the signaling negotiation between the relay node and the source node and the destination node, and when the relay node receives the data packet, the local search is performed.
  • the forwarding link information in the forwarding table maintains the forwarding link of the transport service flow through the forwarding link information of the local forwarding table, thereby improving the utilization efficiency of the bearer network.
  • the local forwarding table may be subdivided into a 4 ⁇ forwarding table and a cell forwarding table.
  • the packet forwarding table and the cell forwarding table can be stored separately (when stored separately, the forwarding table and the cell forwarding table can be backed up, and the packet forwarding table and the cell forwarding table and the corresponding backup table are implemented through synchronization processing.
  • the information is consistent, to facilitate searching, and can also be integrated into a total local forwarding table.
  • the second embodiment of the present invention applies the method for balancing traffic provided in the first embodiment to a specific scenario.
  • the system architecture is as shown in FIG. 6, and includes: an ATM base station, an IP base station, an ATM/IP dual stack Hub, and an ATM/IP dual stack.
  • Base station controller The ATM/IP dual-stack base station controller and the ATM/IP dual-stack Hub have an X link that carries the network as an ATM network and a Y link that carries the network as an IP network.
  • the destination node of the service flow is an ATM/IP dual-stack base station controller, and the link of the service flow is an uplink; when the service flow When the source node is an ATM/IP dual-stack base station controller, the destination node of the service flow is an IP base station or an ATM base station, and the link of the service flow is a downlink; wherein the relay node of the service flow is ATM/IP dual Stack Hub.
  • Step S701 The ATM/IP dual stack Hub receives the service flow establishment request sent by the IP base station or the ATM base station.
  • the establishment and removal of data streams are implemented by transmission control signaling, which are respectively a service flow establishment request and a service flow split request.
  • the ATM/IP dual-stack Hub can obtain the link load information of the current ATM network and the IP network according to the traffic statistics of the X-link and Y-link based ports. If the current X link is idle, the service flow is configured to be forwarded to the ATM/IP dual-stack base station controller through the X link. Otherwise, it is forwarded to the ATM/IP dual-stack base station controller through the Y link.
  • the forwarding link information of the service flow is saved in a local forwarding table, where the local forwarding table may be a cell forwarding table or a packet forwarding table.
  • the source node is an IP base station
  • the X link of the linked ATM network is idle
  • an entry for carrying the IP address through the ATM network is established in the packet forwarding table.
  • the Y link of the linked IP network is idle
  • An entry for carrying an IP packet through the IP network is established in the packet forwarding table.
  • the source node is an ATM base station
  • the source node is an ATM base station
  • the X link of the linked ATM network is idle, an entry for the ATM cell to be carried over the ATM network is established in the cell forwarding table, if the Y link of the linked IP network is compared. If it is idle, an entry for carrying an ATM cell through the IP network is established in the cell forwarding table.
  • AAL2 CID Connection Identity
  • the configuration process is The process of recording the forwarding link information of the cell in the cell forwarding table is to signal the ATM PVC, the AAL2 CID corresponding to the data stream, and the cell forwarding table forwarded to the X link or the Y link.
  • mapping or: configuring
  • the index of the wireless data stream is uniquely identified by the source IP address, the destination IP address, and the UDP (User Datagram Protocol) port number. Therefore, the process of configuring the packet forwarding table is through the letter.
  • the cell forwarding table stores information of the service flow index (or: table lookup content) and forwarding type of the received service flow as an ATM cell (corresponding to the source node of the service flow of Table 1) It can be an ATM base station or an ATM/IP dual stack base station controller.
  • selecting the link information of the ATM network to send the ATM cell (establishing the mapping relationship between the ATM source PVC, the source AAL2 CID to the ATM destination PVC, and the destination AAL2 CID), as shown in the field in Table 1, where the PVC information includes the VPI ( Virtual Path Identifier (Virtual Path Identifier) information and VCI (Virtual Channel Identifier) information; and link information for selecting an ATM network to send ATM cells (for example, table entry N in Table 1, establishing ATM source PVC, source AAL2) Mapping between CID to source IP address, destination IP address, UDP source port number, and UDP destination port number).
  • VPI Virtual Path Identifier
  • VCI Virtual Channel Identifier
  • the packet forwarding table stores the information of the service flow table (or table index) and the forwarding type of the received service flow as an IP packet (corresponding to the source of the service flow of Table 2).
  • the node can be an IP base station or an ATM/IP dual stack base station controller. Including: Selecting the link information of the ATM network to send IP packets (such as entry 1 and entry 2 in Table 2, establishing source IP address, destination IP address, UDP source port number, UDP destination port number, to ATM source PVC, Source AAL2 CID mapping relationship, and link information for selecting an IP network to send IP packets (IP packets are unchanged, straight Connect to the IP routing module for IP routing and forwarding).
  • Step S703 The ATM/IP dual stack Hub notifies the sender (the ATM base station or the IP base station) that the service flow establishment request is successfully established. For example, by transmitting a link establishment success message in the response message of the service flow establishment request, the sender that notifies the service flow establishment request can send the data stream at any time.
  • the negotiated established forwarding link information may also be a response message of the service flow establishment chain request. Feedback to the source node. Since the bearer network of the ATM base station or the IP base station to the ATM/IP dual stack Hub is usually single, after receiving the response message of the ATM/IP dual stack Hub, the ATM base station sends an ATM cell, and if it is an IP base station, Send an IP packet.
  • Step S704 The ATM/IP dual stack Hub forwards the service flow according to the forwarding link information of the service flow stored in the local forwarding table. This step specifically includes:
  • the ATM/IP dual-stack Hub receives the service flow sent by the ATM base station or the IP base station; according to the header information of the service flow (the header information of the IP packet is: source IP address, destination IP address, UDP port number; ATM letter)
  • the meta-information is: ATM PVC, AAL2 CID) matches the lookup table content of the local forwarding table (local forwarding table includes table lookup content and forwarding Type, the content of the lookup table is consistent with the header information of the service flow, and obtain the forwarding link information of the service flow;
  • the ATM cell When the forwarding link information indicates that the ATM cell from the ATM base station is transmitted through the IP network, the ATM cell is encapsulated into an IP packet by the conversion protocol (the ATM adaptation layer 2 AAL2 protocol for terminating the ATM cell, the ATM cell is terminated)
  • the cell payload is encapsulated into an IP packet, and the encapsulated IP packet is forwarded to the destination node;
  • the forwarding link information indicates that the IP packet from the IP base station is transmitted through the ATM network
  • the IP packet is encapsulated into an ATM cell by the conversion protocol (the user datagram of the IP packet is terminated, and the IP packet is reported.
  • the payload is encapsulated into an ATM cell, and the encapsulated ATM cell is forwarded to the destination node.
  • the forwarding link information indicates that the IP packet from the IP base station or the ATM cell from the ATM base station continues to be carried over the original network (the corresponding IP network or the ATM network)
  • the protocol conversion is not required, and the forwarding process is directly performed.
  • Step S705 The ATM/IP dual-stack Hub receives the service flow split request, and deletes the link forwarding information of the service flow.
  • the local forwarding table is a dynamic forwarding table.
  • the forwarding link information of the service flow is established and saved, and after the communication process of the service flow is completed (including: the service flow is completed and the service flow is completed)
  • the forwarding link information of the service flow is removed, and the local forwarding table is updated to correctly calculate the link load information of the current bearer network. For example, in a voice call process, a corresponding link is established in one session, and after the call ends, the link information corresponding to the session is deleted.
  • the link establishment of the uplink data stream is established through signaling negotiation, according to the ATM bearer network and IP between the current ATM/IP dual stack Hub and the ATM/IP dual stack base station controller.
  • the bandwidth utilization of the bearer network is used to perform the load sharing configuration of the data stream, so that the ATM/IP dual-stack Hub can uniformly forward the data traffic between the ATM bearer network and the IP bearer network according to the signaling configuration, thereby improving the utilization efficiency of the bearer network.
  • the third embodiment of the present invention applies the method for equalizing traffic provided in the first embodiment to the downlink service flow transmission process of the system shown in FIG. 6, and includes:
  • Step S801 The ATM/IP dual-stack Hub receives the service flow establishment request sent by the ATM/IP dual-stack base station controller.
  • Step S802 The ATM/IP dual-stack Hub obtains link load information of the ATM network and the IP network between the ATM/IP dual-stack base station controller according to the service flow establishment request, and selects a bearer network with a small link load to establish a service. The forwarding link of the stream.
  • the ATM/IP dual-stack Hub can obtain the link load information of the current ATM network and the IP network according to the traffic statistics of the X-link and Y-link based ports. If the current X link is idle, the service flow sent by the ATM/IP dual-stack base station controller is forwarded to the ATM/IP dual-stack Hub through the X link to further relay to the ATM base station or the IP base station. Otherwise, it is forwarded to the ATM/IP dual stack Hub through the Y link to further relay to the ATM base station or the IP base station.
  • the link establishment process includes a complete link between the ATM/IP dual-stack base station controller to the ATM/IP dual-stack Hub, and then to the ATM base station or the IP base station.
  • the forwarding link information of the service flow stored in the local forwarding table is the same as Table 1 and Table 2, and details are not described herein.
  • Step S803 The ATM/IP dual stack Hub notifies the ATM/IP dual-stack base station controller that the link is successfully established. For example: By carrying a link establishment success message in the response message of the service flow establishment request, the ATM/IP dual-stack base station controller can be notified to send the data stream at any time.
  • the signaling negotiation is an ATM/IP dual-stack Hub, an ATM base station or an IP base station, and an ATM/IP dual-stack base station controller participate in the process
  • the negotiated established forwarding link information can also be fed back through the response message.
  • the source node Since the ATM/IP dual-stack base station controller is the source of the service flow, the useful information in the service flow can be encapsulated into an IP packet or an ATM packet. If the signaling is built on the IP network, the IP packet is configured according to the IP packet. Encapsulation; If the signaling is chained to the ATM network, it is encapsulated in the ATM cell format.
  • Step S804 The ATM/IP dual stack Hub forwards the service flow according to the forwarding link information of the service flow stored in the local forwarding table. This step specifically includes:
  • the ATM/IP dual-stack Hub is based on the header information of the service flow (the IP information header information is: source IP address, destination IP address, UDP port number; ATM cell header information: ATM PVC, AAL2 CID) matches The content of the table of the local forwarding table is obtained, and the forwarding link information of the service flow is obtained;
  • the link established by the service flow is "ATM/IP dual-stack base station controller via ATM network to ATM/IP dual-stack Hub, and then through IP network to IP base station", then ATM/IP dual stack
  • the Hub converts the received ATM cell into a protocol, terminates the AAL2 protocol, encapsulates the cell payload of the ATM cell into an IP packet, and replaces the destination IP address with the IP base station, and sends the encapsulated packet to the IP base station.
  • the link established by the service flow is "ATM/IP dual-stack base station controller via an IP network to an ATM/IP dual-stack Hub, and then via an ATM network to an ATM base station", then the ATM/IP dual stack
  • the base station controller sends an IP packet, and the IP packet sent by the ATM/IP dual-stack base station controller is converted by the ATM/IP dual-stack Hub.
  • the UDP protocol is terminated, and the IP address and UDP port of the IP packet are terminated.
  • the number is replaced with the VPI/VCI of the ATM base station, and the repackaged cell is sent to the ATM base station.
  • the established link is "ATM/IP dual-stack base station controller via ATM network to ATM/IP dual-stack Hub, and then via ATM network to ATM base station"; or "ATM/IP dual-stack base station control" After the IP network is connected to the ATM/IP dual-stack Hub and then to the IP base station via the IP network, the protocol conversion is not required and the forwarding process is directly performed.
  • Step S805 The ATM/IP dual-stack Hub receives the service flow split request, and deletes the link forwarding information of the service flow. This step is similar to step S705 of the second embodiment and will not be described again.
  • the ATM/IP dual-stack base station controller can obtain the link load information of the current bearer network according to the port connected to the ATM network and the IP network, and then decide to select the link load. Small bearer network
  • the ATM/IP dual stack Hub sends traffic.
  • the problem that this will cause is that the ATM/IP dual-stack Hub does not know how to forward after receiving the service flow.
  • the ATM/IP dual-stack Hub still adopts the technical solution provided by this embodiment, the problem is ATM/IP. Dual-stack Hub and ATM/IP dual-stack base station controllers cannot work together, seriously interfering with system performance.
  • the link establishment of the downlink data stream is established through signaling negotiation, according to the ATM bearer network and IP between the current ATM/IP dual stack Hub and the ATM/IP dual stack base station controller.
  • Carrying bandwidth utilization of the bearer network performing load sharing configuration of the data stream, so that the ATM/IP dual stack Hub can receive the balanced reception between the ATM bearer network and the IP bearer network from the ATM/IP dual stack base station controller according to the signaling configuration.
  • Service flow improves the utilization efficiency of the bearer network. Since only one ATM/IP dual-stack Hub device is required between the base station (ATM base station or IP base station) and the ATM/IP dual-stack base station controller, the mutual conversion between the IP data stream and the ATM data stream can be completed. Effectively saves equipment acquisition costs and later maintenance costs.
  • the conversion protocol needs to be converted.
  • the conversion process includes: the ATM adaptation layer 2 AAL2 protocol for terminating the ATM cell, the cell payload of the ATM cell is encapsulated into an IP packet; and the UDP protocol for terminating the IP packet, and the message payload of the IP packet is encapsulated. Encapsulated into ATM cells.
  • the ATM base station sends a service flow, and when the forwarding link information of the service flow established by the ATM/IP dual-stack Hub indicates transmission to the ATM/IP dual-stack base station controller through the IP network, the When the conversion protocol is processed, the encapsulation structure of the service flow in the forwarding link is as shown in FIG. 9. Comparing Figure 9 with Figure 4, the conversion protocol is different from the 7-load mode of the PWE3 protocol in Figure 4.
  • the PWE3 protocol is a solution that encapsulates the entire ATM cell and requires two conversions.
  • the 7-load mode of the embodiment of the present invention has a lower level of protocol than the PWE3 protocol, and the transmission efficiency is higher, and there is no need for two peers between the ATM base station and the ATM/IP dual-stack base station controller. Equipment transfer, saving costs.
  • the IP base station sends the service flow
  • the ATM/IP dual-stack Hub selects the 7
  • FIG. 10 by comparing FIG. 10 with FIG. 2, it can be seen that the conversion protocol of the embodiment of the present invention has a lower protocol level than IPoA, has higher transmission efficiency, and saves cost.
  • the bearer mode is similar to the above two cases. No longer.
  • Embodiment 4 A system for equalizing traffic (the system may be a system consisting of an ATM/IP dual stack Hub, an ATM base station, an IP base station, and an ATM/IP dual stack base station controller in FIG. 6), including: a source node, a relay node, and a destination node; wherein
  • the source node is configured to send a service flow and a service flow establishment request of the service flow;
  • the relay node is configured to receive a service flow establishment request sent by the source node, and establish a chain according to the service flow. And obtaining a link load information of each bearer network between the source node and the destination node, selecting a bearer network with a small link load to establish a forwarding link of the service flow, and forwarding the service flow according to the forwarding link;
  • the destination node is configured to receive the service flow forwarded by the relay node.
  • the relay node may be an ATM/IP dual stack hub.
  • the source node may be any one of an ATM base station, an IP base station, and an ATM/IP dual-stack base station controller. When the source node is an ATM base station or an IP base station, the destination node is an ATM/IP dual-stack base station controller; When the node is an ATM/IP dual-stack base station controller, the destination node is an ATM base station or an IP base station.
  • the relay node may be an ATM/IP dual stack hub. As shown in FIG. 11, the ATM/IP dual stack Hub includes:
  • the signaling receiving module 1 is configured to receive a service flow establishing chain request sent by the source node, and the acquiring module 2 is configured to obtain link load information of each bearer network between the source node and the destination node according to the service flow establishing chain request;
  • the link selection module 3 is configured to select a forwarding link of the service flow to establish a forwarding link of the service flow according to the link load information of the bearer network.
  • the relay node further includes:
  • the storage module 4 is configured to store the forwarding link information of the service flow in the local forwarding table.
  • the storage module 4 is further configured to: when the service flow split request is received, delete the forwarding link information of the service flow, where the service chain split request may also be obtained by the signaling receiving module 1.
  • the signaling sending module 5 is configured to notify the source node that the link is successfully established.
  • the cell receiving module 6 is configured to receive an ATM cell sent by the source node.
  • the cell search module 7 is configured to search the cell forwarding table in the local forwarding according to the header information of the ATM cell, and obtain the forwarding link information of the ATM cell.
  • the first protocol conversion module 8 is configured to encapsulate the ATM cell into an IP packet.
  • Routing module 9 used to allocate routes for IP packets.
  • the packet sending module 10 is configured to send an IP packet.
  • the packet receiving module 11 is configured to receive an IP packet sent by the source node.
  • the packet search module 12 is configured to search for a packet forwarding table in the local forwarding table according to the header information of the IP packet, and obtain forwarding link information of the IP packet.
  • the second protocol conversion module 13 is configured to encapsulate the IP packet into an ATM cell.
  • the aggregation module 14 is configured to aggregate ATM cells.
  • the cell sending module 15 is configured to send an ATM cell.
  • the device shown in FIG. 11 is used as an example for the ATM/IP dual-stack Hub.
  • the interaction process of each module includes:
  • the signaling receiving module 1 receives a service flow establishment request sent by the source node (any one of an ATM base station, an IP base station, or an ATM/IP dual-stack base station controller), and the link selection module 3 obtains the current and ATM acquired by the acquisition module 2.
  • the data traffic of the ATM port and the IP port connected to the IP dual-stack base station controller is selected, and the bearer network with the small traffic is selected to establish a forwarding link, and the forwarding link information is stored in the cell forwarding table in the storage module 4, and the storage is completed.
  • the signaling module 5 notifies the source node that the service flow can be sent at any time.
  • the cell search module 7 searches for the memory.
  • the cell forwarding table of the storage module 4 (or the packet forwarding table of the storage module 4 is searched by the message lookup module 12) to obtain the forwarding link information, and when the forwarding link information indicates:
  • the ATM cell when the ATM cell is transmitted over the IP network, the ATM cell is encapsulated into an IP packet by the conversion protocol in the first protocol conversion module 8, and the re-encapsulated IP packet is routed through the routing module 9, and the packet is reported.
  • the text sending module 10 sends an IP packet to the destination node.
  • the aggregation module 14 performs PVC switching or AAL2 exchange on the ATM cell to aggregate the ATM cell, and sends it through the cell sending module 15.
  • the destination node when the source node is an ATM base station, the destination node is an ATM/IP dual-stack base station controller; when the source node is an ATM/IP dual-stack base station controller, the destination node is an ATM base station.
  • the IP packet when the IP packet is transmitted through the ATM network, the IP packet is encapsulated into an ATM cell by using the conversion protocol in the second protocol conversion module 13, and the ATM module performs PVC switching or AAL2 exchange to aggregate the ATM cell.
  • the ATM cell is transmitted by the cell transmitting module 15.
  • the IP packet received by the packet receiving module 11 is directly routed through the routing module 9, and then sent through the packet sending module 10.
  • the destination node when the source node is an IP base station, the destination node is an ATM/IP dual-stack base station controller; when the source node is an ATM/IP dual-stack base station controller, the destination node is an IP. Base station.
  • the broken line in Fig. 11 indicates the link of the ATM cell
  • the solid line indicates the link of the IP packet.
  • the device provided in this embodiment implements equalization processing of the service flow and improves system performance.
  • the load sharing configuration of the data flow improves the utilization efficiency of the bearer network.
  • the IP and ATM data streams can be completed. The mutual conversion effectively saves the equipment acquisition cost and the later maintenance cost.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment, or may be changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
  • the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.
  • a non-volatile storage medium which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.
  • the instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

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Description

一种均衡流量的方法、 装置及系统 本申请要求于 2008 年 4 月 29 日提交中国专利局, 申请号为 200810094393.1 , 发明名称为 "一种均衡流量的方法、 装置及系统" 的中国专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明实施例涉及通信技术领域,特别是涉及一种均衡流量的方 法、 装置及系统。 背景技术
3G ( 3rd Generation, 第三代移动通信)无线接入网, 往往采用 微波或者城域光传输网络作为基站和基站控制器之间的数据传输桥 梁。 由于业界主流移动运营商如 Vodafone、 Orange等, 都主要以微 波组网和租用固网运营商传输网络为主进行无线运营,基站首先通过 微波进行接入, 然后经过租用的城域光传输网络的地面传输后, 最终 汇聚为高速链路, 送入基站控制器。 根据话务模型, 由于基站不会同 时达到流量峰值, 因此可考虑在微波的第一级接入处, 加入汇聚节点
(或者: 传输网关), 对无线的业务数据采用包交换的方式进行汇聚, 以实现带宽复用。因此采用业务汇聚网关能明显提升基站间的流量复 用效率, 从而节省购买微波设备或租用城域光传输的成本。
目前支持无线数据流量汇聚功能的方案有 2种:一种是采用 ATM
( Asynchronous Transfer Mode, 异步传输模式 )交换机或专用设备的 ATM Hub组网方法,利用 ATM交换和 AAL2(ATM Adaptation Layer 2 , ATM适配层 2)交换协议实现流量汇聚, 以提升传输效率; 另一种是 采用路由器的 IP ( Internet Protocol, 因特网协议) 4艮文路由功能实现 流量汇聚的 IP Hub组网方法, 以提升传输效率。
与本发明相关的现有技术一, 利用 IPoA ( IP over ATM , IP协议 承载于 ATM网络)协议, 实现 IP数据流在 ATM承载网上的传输。 其中标准的 IPo A协议可实现 IP数据流在 ATM承载网上的传输, 即支持 IP基站数据流在 ATM承载网络上的传输。组网方案如图 1所 示, IP基站将数据流通过 IP城域网的接入层接入到 ATM交换机 1 , 最终汇聚到 ATM交换机 1提供的 IP接口上; ATM交换机 1对接入 的 IP报文进行 IPoA协议的封装处理, 经过 IPoA的封装, IP报文会 被封装成信元的形式, 在 ATM网络上进行传输(图 1所示为城域接 入网的汇聚层)。 ATM交换机 2在接收到信元时, 完成 ATM交换机 1的逆过程, 将信元重组, 然后最终恢复 IPoA承载的净荷, 即 IP报 文。
图 2是现有技术一中的协议栈承载转换示意图, 如图可以看到,
ATM交换机 1和 ATM交换机 2上实际是利用 ATM网络上的隧道, 即 ATM的虚通道, 来承载 IP报文, 从而实现 IP报文在 ATM承载网 络上的传输。
在实现本发明的过程中, 发明人发现现有技术至少存在以下缺 点:
1、 需要两套转换设备, 增加了成本。
2、 根据 IPoA协议, IP报文要经过 IPoA的封装和添加尾部, 降 低了承载效率, 在传输的过程中, 因为封装层次增加, 使得传输效率 降低。
与本发明相关的现有技术二, 利用 PWE3 ( Pseudowire Emulation
Edge-to-Edge, 点到点伪线仿真技术)技术, 实现 ATM数据流在 IP 承载网上的传输。
图 3为现有技术二的组网方案, 如图 3所示, ATM基站将数据 流通过 ATM城域网的接入层接入到 PWE3设备 1 ,接入侧 ATM网络 可以采用 IMA ( Inverse Multiplexing for ATM , ATM反向复用) over E1/T1、 ATM over SDH ( Synchronous Digital Hierarchy, 同步数字传 输协议 )等各种手段接入, 最终汇聚到 PWE3设备 1提供的 ATM接 口上; PWE3设备 1对接入的 ATM信元进行 PWE3协议封装, 经过 PWE3的封装, ATM信元会被封装成 IP报文的形式, 在 IP网络上进 行传输(图 3所示为城域接入网的汇聚层); PWE3设备 2完成 PWE3 设备 1的逆过程, 将接收的 IP报文拆解为信元, 然后发送给基站控 制器。
图 4是与图 3对应的协议栈承载转换示意图,如图可看到, PWE3 设备 1和 PWE3设备 2上实际是利用 IP网络上的隧道, 即 IP网络的 伪线仿真, 来承载 ATM信元, 从而实现 ATM信元在 IP承载网络上 的传输。
在实现本发明的过程中,发明人发现现有技术二与现有技术一存 在类似的缺点:
1、 需要两套转换设备, 增加了成本。
2、 承载效率低。 同时因为封装层次增加, 也使得传输效率降低。 更为关键的是:
对于已有 ATM、 IP 载网络的运营商, 希望能够同时利用 ATM 和 IP承载网接入基站业务, 将 ATM的高可靠性和 IP的灵活性及高 带宽特性结合起来, 达到两个承载网的利用率最大化。
在现有的技术方案中, 缺乏透明传输机制, 无法根据不同的承载 网络的链路负荷信息进行流量均衡处理, 实现带宽的共享。 发明内容
本发明实施例提供一种均衡流量的方法、 装置及系统, 以实现提 升承载网络的传输效率。
为达到上述目的, 本发明实施例一方面提供一种均衡流量的方 法, 包括:
中继节点接收源节点发送的业务流建链请求;
所述中继节点根据所述业务流建链请求获取所述源节点与目的 节点之间各个承载网络的链路负荷信息,选择链路负荷小的承载网络 建立业务流的转发链路;
所述中继节点根据所述转发链路转发所述业务流。 本发明实施例另一方面还提供一种均衡流量的系统, 包括: 源节 点、 中继节点以及目的节点; 其中,
所述源节点, 用于发送业务流和所述业务流的业务流建链请求; 所述中继节点, 用于接收所述源节点发送的所述业务流建链请 求,根据所述业务流建链请求获取所述源节点与所述目的节点之间各 个承载网络的链路负荷信息 ,选择链路负荷小的承载网络建立所述业 务流的转发链路, 根据所述转发链路转发所述业务流;
所述目的节点, 用于接收所述中继节点转发的所述业务流。 本发明实施例还提供一种均衡流量的装置, 包括:
信令接收模块, 用于接收源节点发送的业务流建链请求; 获取模块,用于根据所述业务流建链请求获取所述源节点与目的 节点之间各个承载网络的链路负荷信息;
链路选择模块,用于根据所述承载网络的链路负荷信息选择链路 负荷小的承载网络建立业务流的转发链路。
本发明实施例还提供一种 ATM协议栈到 IP协议栈的转换方法, 包括:
根据 ATM信元的头部信息查找本地转发表, 获取所述 ATM信 元的转发链路信息;
当所述转发链路信息指示将所述 ATM信元通过 IP网络传输时, 将所述 ATM信元封装成 IP报文, 向 ATM/IP双栈基站控制器转发所 述 "¾文; 或者,
根据所述转发链路信息将所述 ATM信元封装成 IP报文, 向 IP 基站转发所述 IP报文。
本发明实施例还提供一种 IP协议栈到 ATM协议栈的转换方法, 包括:
根据 IP报文的头部信息查找本地转发表, 获取所述 IP报文的转 发链路信息;
当所述转发链路信息指示将所述 IP报文通过 ATM网络传输时, 将所述 IP报文封装成 ATM信元, 向 ATM/IP双栈基站控制器转发所 述 ATM信元; 或者,
根据所述转发链路信息将所述 IP报文封装成 ATM信元,向 ATM 基站转发所述 ATM信元。
与现有技术相比, 本发明实施例的技术方案具有以下优点: 通过信令面的准入控制, 在数据流建立的时候, 通过信令协商, 依据当前承载网络的链路负荷信息, 进行数据流的负荷分担配置, 提 高^载网络的利用效率; 另外, 中继节点同时支持 ATM和 IP网络, 支持 ATM和 IP网络标准协议,封装效率高,提升了网络带宽利用率; 采用 ATM-IP标准协议之间的变换功能, ATM/IP双协议栈设备集成 度高, 有效节约了设备的购置费用和后期的维护成本。 附图说明
图 1为现有技术一中的采用 IPoA协议组网的架构的示意图; 图 2为现有技术一采用 IPoA协议组网的协议栈承载转换的示意 图;
图 3为现有技术二中的采用 PWE3协议组网的架构的示意图; 图 4为现有技术二采用 PWE3协议组网的协议栈承载转换的示意 图;
图 5为本发明实施例一中的均衡流量的方法流程示意图; 图 6为本发明实施例中的 ATM/IP 载网络的系统架构示意图; 图 7为本发明实施例二中的均衡流量的方法流程示意图; 图 8为本发明实施例三中的均衡流量的方法流程示意图; 图 9为本发明实施例中的 ATM信元转换为 IP承载网进行传输的 协议栈示意图;
图 10为本发明实施例中的 IP报文转换为 ATM承载网进行传输 的协议栈示意图;
图 11为本发明实施例四中的均衡流量的装置结构示意图。 具体实施方式
本发明实施例提供一种均衡流量的方法、 装置及系统。
下面结合附图和实施例, 对本发明的具体实施方式作进一步 详细描述:
本发明实施例针对业务流的源节点与中继节点 (例如网关、 以及本发明实施例提供的 ATM/IP双栈 Hub )、 和 /或中继节点与目 的节点之间至少两个可用承载网络提出的。
本发明实施例一提供一种均衡流量的方法, 如图 5 所示, 其 中中继节点完成以下步骤的操作:
步骤 S501、 中继节点接收源节点发送的业务流建链请求。
步骤 S502、 所述中继节点根据所述业务流建链请求获取所述源 节点与目的节点之间各个承载网络的链路负荷信息,选择链路负荷小 的承载网络建立业务流的转发链路。
在该步骤中, 当中继节点选择链路负荷小的承载网络建立业务流 的转发链路之后, 还包括: 通知所述源节点链路建立成功; 以及将所 述业务流的转发链路信息保存到本地转发表中。
步骤 S503、 所述中继节点根据所述转发链路转发所述业务流。 步骤 S503.1、 所述中继节点接收到源节点发送的业务流时, 根 据业务流的头部信息查找本地转发表, 获取业务流的转发链路信息。
步骤 S503.2、 当转发链路信息指示将 ATM信元通过 IP网络传 输时, 将 ATM信元封装成 IP报文, 向目的节点转发封装后的 IP报 文(可以通过 IP路由进行发送); 或者
当转发链路信息指示将 IP报文通过 ATM网络传输时, 将 IP报 文封装成 ATM信元, 向目的节点转发封装后的 ATM信元(发送之 前可以进行汇聚处理)。
在中继节点获取到业务流的转发链路信息之后, 当该中继节点的 转发链路信息指示: ATM信元通过 ATM网络继续传输、 或者 IP报 文通过 IP 网络继续传输时, 按现有流程处理(选择链路以均衡流量 则通过本发明实施例的方法实现)。
在本实施例中, 当中继节点接收到业务流的拆链请求时, 根据拆 链请求移除本地转发表中该业务流的转发链路信息, 更新本地转发 表。
在本实施例中, 通过中继节点与源节点及目的节点的信令协商, 依据当前承载网络的链路负荷信息, 进行数据流的负荷分担配置, 当中继节点接收到数据包时, 查找本地转发表中的转发链路信息, 通过本地转发表的转发链路信息来维护传输业务流的转发链路, 提高承载网络的利用效率。
本实施例中, 本地转发表可以细分为4艮文转发表和信元转发 表。 其中, 报文转发表和信元转发表可以独立存放(独立存放时, 还可以进行转发表和信元转发表的备份, 并通过同步处理, 实现 报文转发表和信元转发表和对应的备份表之间的信息一致, 以方 便查找), 也可以集成在一个总的本地转发表中。
本发明实施例二将实施例一提供的均衡流量的方法应用到具 体场景中,系统架构如图 6所示,包括: ATM基站、 IP基站、 ATM/IP 双栈 Hub、 以及 ATM/IP双栈基站控制器。 ATM/IP双栈基站控制 器与 ATM/IP双栈 Hub之间存在承载网络为 ATM网络的 X链路和 承载网络为 IP网络的 Y链路。 在业务流的传送过程中, 当源节点 为 IP基站或 ATM基站时, 该业务流的目的节点为 ATM/IP双栈基站 控制器, 业务流传送的链路为上行链路; 当该业务流的源节点为 ATM/IP双栈基站控制器时, 该业务流的目的节点为 IP基站或 ATM 基站, 业务流传送的链路为下行链路; 其中业务流的中继节点为 ATM/IP双栈 Hub。
本实施例以图 6所示架构中的上行链路为例进一步详细描述: 如图 7所示, 包括以下步骤:
步骤 S701、 ATM/IP双栈 Hub接收 IP基站或 ATM基站发送的 业务流建链请求。 在图 5所示的接入网中, 数据流的建立和拆除由 传输控制信令来实现, 分别为业务流建链请求和业务流拆链请求。 步骤 S702、 ATM/IP双栈 Hub根据该业务流建链请求获取与 ATM/IP双栈基站控制器之间的 ATM网络和 IP网络的链路负荷信息, 选择链路负荷小的承载网络建立业务流的转发链路。
在该步骤中, ATM/IP双栈 Hub可根据基于 X链路、 Y链路的 端口的流量统计来获取当前的 ATM 网络和 IP 网络的链路负荷信 息。 如果当前 X链路较为空闲, 则配置该业务流通过 X链路转发 到 ATM/IP双栈基站控制器。 反之, 则通过 Y链路转发到 ATM/IP 双栈基站控制器。
在该步骤中, 还包括:
将所述业务流的转发链路信息保存到本地转发表中, 其中, 本 地转发表可以是信元转发表, 也可以是报文转发表。 当源节点是 IP 基站时, 如果链接 ATM网络的 X链路较空闲, 则在报文转发表中建 立通过 ATM网络承载 IP 文的表项, 如果链接 IP网络的 Y链路较 空闲,则在报文转发表中建立通过 IP网络承载 IP报文的表项。同理, 当源节点是 ATM基站时, 如果链接 ATM网络的 X链路较空闲, 则 在信元转发表中建立通过 ATM网络承载 ATM信元的表项, 如果链 接 IP网络的 Y链路较空闲,则在信元转发表中建立通过 IP网络承载 ATM信元的表项。
在本地转发表中:
对于 ATM 信元, 由于无线数据流的索引是依靠 ATM PVC
( Permanent Virtual Circuit, 永久虚电路), AAL2 CID ( Connection Identity, 连接标识) 唯一标识的, 因此配置信元转发表(信元转 发表可以预先设置在 ATM/IP双栈 Hub中, 配置的过程就是将信元 的转发链路信息记录在信元转发表中) 的过程就是通过信令对该 数据流对应的 ATM PVC, AAL2 CID, 以及转发到 X链路或 Y链 路的信元转发表中的信息进行映射 (或称: 配置) 的一个过程。
对于 IP报文, 由于无线数据流的索引是依靠源 IP地址、 目的 IP地址, UDP ( User Datagram Protocol, 用户数据才艮协议)端口号 唯一标识的, 因此配置报文转发表的过程就是通过信令协商对该 数据流对应的源 IP地址、 目的 IP地址, UDP端口号 (包括 UDP 源端口号和 UDP目的端口号), 转发到 X链路或 Y链路的转发表 的信息进行映射 (或称: 配置) 的一个过程。
如表 1所示, 信元转发表中存储的是接收到的业务流为 ATM 信元的业务流索引 (或称: 查表内容) 和转发类型的信息 (对应 表 1的业务流的源节点可以为 ATM基站, 也可以是 ATM/IP双栈 基站控制器)。包括:选择 ATM网络发送 ATM信元的链路信息(建 立 ATM源 PVC、源 AAL2 CID到 ATM目的 PVC、目的 AAL2 CID 的映射关系),如表 1中的字段所示,其中 PVC信息包括 VPI( Virtual Path Identifier , 虚拟路径标识) 信息和 VCI ( Virtual Channel Identifier, 虚拟通道标识 )信息; 以及选择 IP网络发送 ATM信元 的链路信息 (如表 1中表项 N, 建立 ATM源 PVC、 源 AAL2 CID 到源 IP地址、 目的 IP地址、 UDP源端口号、 UDP 目的端口号的 映射关系)。
表 1 (信元转发表 )
Figure imgf000011_0001
如表 2所示, 报文转发表中存储的是将接收到的业务流为 IP 报文的业务流查表内容(或称表索引) 和转发类型的信息 (对应 表 2的业务流的源节点可以是 IP基站, 也可以是 ATM/IP双栈基 站控制器)。 包括: 选择 ATM网络发送 IP报文的链路信息 (如表 2中的表项 1和表项 2 , 建立源 IP地址、 目的 IP地址、 UDP源端 口号、 UDP 目的端口号到 ATM源 PVC、 源 AAL2 CID的映射关 系), 以及选择 IP网络发送 IP报文的链路信息 (IP报文不变, 直 接进入 IP路由模块进行 IP路由转发)。
表 2 (报文转发表)
Figure imgf000012_0001
步骤 S703、 ATM/IP双栈 Hub通知业务流建立请求的发送方 ( ATM基站或 IP基站 )链路建立成功。 例如: 通过在该业务流建 立请求的响应消息中携带链路建立成功消息, 通知业务流建立请 求的发送方可以随时发送数据流了。
由于信令协商是 ATM/IP双栈 Hub、 ATM基站或 IP基站、 以及 ATM/IP双栈基站控制器共同参与的过程, 协商建立的转发链路信息 也可以通过业务流建链请求的响应消息反馈给源节点。 由于 ATM基 站或 IP基站到 ATM/IP双栈 Hub的承载网络通常情况下是单一的, 在接收到 ATM/IP双栈 Hub的响应消息后, ATM基站发送 ATM信元, 如果是 IP基站, 则发送 IP报文。
步骤 S704、 ATM/IP双栈 Hub根据本地转发表中存储的业务流 的转发链路信息转发业务流。 该步骤具体包括:
ATM/IP双栈 Hub接收到 ATM基站或 IP基站发送的业务流时; 根据业务流的头部信息(IP报文的头部信息为: 源 IP地址、 目的 IP 地址, UDP端口号; ATM信元的头部信息为: ATM PVC、 AAL2 CID ) 匹配本地转发表的查表内容(本地转发表包括查表内容和转发 类型, 查表内容与业务流的头部信息一致), 获取业务流的转发链路 信息;
当转发链路信息指示将来自 ATM基站的 ATM信元通过 IP网络 传输时, 通过转换协议将 ATM信元封装成 IP报文(终结 ATM信元 的 ATM适配层 2 AAL2协议, 将 ATM信元的信元净荷封装成 IP报 文), 向目的节点转发封装后的 IP报文;
当转发链路信息指示将来自 IP基站的 IP报文通过 ATM网络传 输时, 通过转换协议将 IP报文封装成 ATM信元(终结 IP报文的用 户数据报 UDP协议, 将 IP报文的报文净荷封装成 ATM信元), 向目 的节点转发封装后的 ATM信元。
当转发链路信息指示来自 IP基站的 IP报文或来自 ATM基站的 ATM信元继续沿用原有的网络(对应的 IP网络或 ATM网络)继续 承载时, 不需要进行协议转换, 直接进行转发处理。
步骤 S705、 ATM/IP双栈 Hub接收业务流拆链请求, 删除业务 流的链路转发信息。
本地转发表是一个动态的转发表, 在接收到业务流建链请求 时, 建立并保存业务流的转发链路信息, 在完成业务流的通信过 程后 (包括: 业务流传送完毕和该业务流的转发链路异常中断等), 接收到业务流拆链请求时, 移除该业务流的转发链路信息, 更新本地 转发表, 以正确的统计当前的承载网络的链路负荷信息。 比如语音通 话过程中, 一次会话建立一个对应的链路, 通话结束后, 删除该会 话对应的链路信息。
本实施例中:
通过信令面的准入控制, 通过信令协商, 对上行链路数据流 的链路建立, 依据当前 ATM/IP双栈 Hub与 ATM/IP双栈基站控制 器之间的 ATM承载网络和 IP承载网络的带宽利用情况,进行数据 流的负荷分担配置,使 ATM/IP双栈 Hub可根据信令配置,在 ATM 承载网络和 IP承载网络间均衡的转发数据流量, 提高承载网络的 利用效率。 由于基站( ATM基站或 IP基站)和 ATM/IP双栈基站控 制器之间仅需要一个 ATM/IP双栈 Hub设备即可完成 IP和 ATM数 据流之间的相互转换, 有效的节约了设备的购置成本以及后期的 维护成本。
本发明实施例三将实施例一提供的均衡流量的方法应用到图 6所示系统的下行链路的业务流传送过程中, 包括:
步骤 S801、 ATM/IP双栈 Hub接收 ATM/IP双栈基站控制器发送 的业务流建链请求。
步骤 S802、 ATM/IP双栈 Hub根据该业务流建链请求获取与 ATM/IP双栈基站控制器之间的 ATM网络和 IP网络的链路负荷信息, 选择链路负荷小的承载网络建立业务流的转发链路。
在该步骤中, ATM/IP双栈 Hub可根据基于 X链路、 Y链路的 端口的流量统计来获取当前的 ATM 网络和 IP 网络的链路负荷信 息。 如果当前 X链路较为空闲, 则配置 ATM/IP双栈基站控制器发 送的业务流通过 X链路转发到 ATM/IP双栈 Hub, 以进一步中继到 ATM基站或 IP基站。反之,则通过 Y链路转发到 ATM/IP双栈 Hub, 以进一步中继到 ATM基站或 IP基站。
其中,链路的建立过程包括 ATM/IP双栈基站控制器到 ATM/IP 双栈 Hub、 再到 ATM基站或 IP基站的一个完整的链路。
在该步骤中, 在本地转发表中存储的业务流的转发链路信息 同表 1和表 2, 不再赘述。
步骤 S803、 ATM/IP双栈 Hub通知 ATM/IP双栈基站控制器链 路建立成功。 例如: 通过在业务流建链请求的响应消息中携带链 路建立成功消息, 通知 ATM/IP双栈基站控制器可以随时发送数据 流了。
在该步骤中, 由于信令协商是 ATM/IP双栈 Hub, ATM基站或 IP基站、 以及 ATM/IP双栈基站控制器共同参与的过程, 协商建立的 转发链路信息也可以通过响应消息反馈给源节点。 由于 ATM/IP双栈 基站控制器是业务流的源头, 可以将业务流中的有用信息封装成 IP报文或 ATM报文, 如果信令建链在 IP网络, 则按照 IP报文格 式进行封装; 如果信令建链在 ATM网络, 则按照 ATM信元格式 进行封装。
步骤 S804、 ATM/IP双栈 Hub根据本地转发表中存储的业务流 的转发链路信息转发业务流。 该步骤具体包括:
ATM/IP双栈 Hub根据业务流的头部信息( IP 文的头部信息为: 源 IP地址、 目的 IP地址, UDP端口号; ATM信元的头部信息为: ATM PVC、 AAL2 CID ) 匹配本地转发表的查表内容, 获取业务流 的转发链路信息;
当转发链路信息指示: 该业务流建立的链路是" ATM/IP双栈基 站控制器经 ATM网络到 ATM/IP双栈 Hub, 再经 IP网络到 IP基 站", 则 ATM/IP双栈 Hub将接收到的 ATM信元进行协议转换, 终结 AAL2协议, 将 ATM信元的信元净荷封装成 IP报文, 并更换 目的 IP地址为 IP基站, 将封装后的报文发送到 IP基站;
当转发链路信息指示: 该业务流建立的链路是" ATM/IP双栈基 站控制器经 IP网络到 ATM/IP双栈 Hub, 再经 ATM网络到 ATM 基站",则 ATM/IP双栈基站控制器发出的就是 IP报文,由 ATM/IP 双栈 Hub将 ATM/IP双栈基站控制器发来的 IP报文进行协议转换, 终结 UDP协议, 将 IP报文的 IP地址、 UDP端口号等更换为 ATM 基站的 VPI/VCI, 将重新封装后的信元发送到 ATM基站。
当转发链路信息指示: 建立的链路是 "ATM/IP双栈基站控制器 经 ATM网络到 ATM/IP双栈 Hub, 再经 ATM网络到 ATM基站"; 或者" ATM/IP双栈基站控制器经 IP网络到 ATM/IP双栈 Hub, 再 经 IP网络到 IP基站",则不需要进行协议转换,直接进行转发处理。
步骤 S805、 ATM/IP双栈 Hub接收业务流拆链请求, 删除业务 流的链路转发信息。 该步骤与实施例二的步骤 S705类似, 不再赘 述。
与本实施例相关的一些技术方案中, 通常会认为 ATM/IP双栈 基站控制器可以根据与 ATM网络和 IP网络连接的端口获取当前的承 载网络的链路负荷信息, 然后决定选择链路负荷小的承载网络向 ATM/IP双栈 Hub发送业务流。 但这样将导致的问题是 ATM/IP双栈 Hub接收到该业务流之后不知道该如何转发, 即使 ATM/IP双栈 Hub 仍采用本实施例提供的技术方案, 导致的问题则是 ATM/IP双栈 Hub 和 ATM/IP双栈基站控制器无法协同作业, 严重干扰了系统的性能。
本实施例中:
通过信令面的准入控制, 通过信令协商, 对下行链路数据流 的链路建立, 依据当前 ATM/IP双栈 Hub与 ATM/IP双栈基站控制 器之间的 ATM承载网络和 IP承载网络的带宽利用情况,进行数据 流的负荷分担配置,使 ATM/IP双栈 Hub可根据信令配置,在 ATM 承载网络和 IP承载网络间均衡的接收来自 ATM/IP双栈基站控制 器的业务流, 提高承载网络的利用效率。 由于基站 (ATM基站或 IP基站 )和 ATM/IP双栈基站控制器之间仅需要一个 ATM/IP双栈 Hub设备即可完成 IP数据流和 ATM数据流之间的相互转换。有效 的节约了设备的购置成本以及后期的维护成本。
在实施例二和实施例三中, 在报文的转发过程中, 当 ATM/IP 双栈 Hub将 ATM信元通过 IP网络传输、 或 IP 文通过 ATM网络 传输时, 需要通过转换协议进行转换, 转换过程包括: 终结 ATM信 元的 ATM适配层 2 AAL2协议, 将 ATM信元的信元净荷封装成 IP 报文; 以及终结 IP报文的 UDP协议, 将 IP报文的报文净荷封装成 ATM信元。
在图 6所示的系统架构中, ATM基站发送业务流, 当 ATM/IP 双栈 Hub 建立的业务流的转发链路信息指示通过 IP 网络传输到 ATM/IP双栈基站控制器时, 通过该转换协议进行处理时, 业务流 在转发链路中的封装结构如图 9所示。 比较图 9与图 4 , 该转换 协议与图 4中 PWE3协议的 7 载方式不同, PWE3协议的处理方案 是将整体 ATM信元进行封装, 而且需要两次转换。 因此, 据图可 知: 本发明实施例的 7 载方式比 PWE3 协议的 7 载方式协议层次 更低, 传输效率更高, 而且 ATM基站和 ATM/IP双栈基站控制器 之间无需两个对等设备转接, 节约了成本。 同理, IP 基站发送业务流, ATM/IP 双栈 Hub 选择发送到 ATM/IP双栈基站控制器的 7|载网络为 ATM 网络时, 业务流转发 过程中的协议栈如图 10所示。 同理, 通过比较图 10与图 2可获 知: 本发明实施例的转换协议比 IPoA的协议层次更低, 传输效率 更高, 而且节约了成本。
当 ATM/IP双栈基站控制器发送的 ATM信元需要传输到 IP基 站、 或者 ATM/IP双栈基站控制器发送的 IP报文需要传输到 ATM 基站时, 承载方式与上述两种情况类似, 不再赘述。
实施例四、一种均衡流量的系统(该系统可以是图 6由 ATM/IP 双栈 Hub、 ATM基站、 IP基站、 和 ATM/IP双栈基站控制器组成 的系统), 包括: 源节点、 中继节点、 以及目的节点; 其中,
所述源节点, 用于发送业务流和所述业务流的业务流建链请求; 所述中继节点, 用于接收所述源节点发送的业务流建链请求, 根据所述业务流建链请求获取所述源节点与所述目的节点之间各 个承载网络的链路负荷信息,选择链路负荷小的承载网络建立业务 流的转发链路, 根据所述转发链路转发所述业务流;
所述目的节点, 用于接收所述中继节点转发的所述业务流。 其中所述中继节点可以是 ATM/IP 双栈 Hub。 源节点可以是 ATM基站、 IP基站、 和 ATM/IP双栈基站控制器中的任意一种, 当源节点为 ATM基站或 IP基站时, 目的节点为 ATM/IP双栈基站 控制器; 当源节点为 ATM/IP双栈基站控制器时, 目的节点为 ATM 基站或 IP基站。
其中, 中继节点可以是 ATM/IP双栈 Hub, 如图 11所示, 所 述 ATM/IP双栈 Hub包括:
信令接收模块 1 , 用于接收源节点发送的业务流建链请求; 获取模块 2,用于根据业务流建链请求获取源节点与目的节点 之间各个承载网络的链路负荷信息;
链路选择模块 3 , 用于根据承载网络的链路负荷信息选择链路 负荷小的承载网络建立业务流的转发链路。 该中继节点还包括:
存储模块 4,用于将业务流的转发链路信息存储在本地转发表 中。 其中, 存储模块 4还用于在接收到业务流拆链请求时, 删除 所述业务流的转发链路信息, 其中业务流的拆链请求也可以通过 信令接收模块 1来获取。
信令发送模块 5 , 用于通知源节点链路建立成功。
信元接收模块 6, 用于接收源节点发送的 ATM信元。
信元查找模块 7 , 用于根据 ATM信元的头部信息查找本地转 发表中的信元转发表; 获取 ATM信元的转发链路信息。
第一协议转换模块 8 , 用于将 ATM信元封装成 IP报文。
路由模块 9, 用于分配 IP报文的路由。
报文发送模块 10, 用于发送 IP报文。
报文接收模块 11 , 用于接收源节点发送的 IP报文。
报文查找模块 12, 用于根据 IP报文的头部信息查找本地转发 表中的报文转发表; 获取 IP报文的转发链路信息。
第二协议转换模块 13 , 用于将 IP报文封装成 ATM信元。 汇聚模块 14 , 用于汇聚 ATM信元。
信元发送模块 15 , 用于发送 ATM信元。
采用图 11所示的装置, 以 ATM/IP双栈 Hub为例进行说明, 各模块的交互流程包括:
信令接收模块 1接收源节点 (ATM基站、 IP基站或 ATM/IP 双栈基站控制器的任意一种) 发送的业务流建链请求, 链路选择 模块 3通过获取模块 2获取的当前与 ATM/IP双栈基站控制器连接 的 ATM端口和 IP端口的数据流量, 选择流量小的承载网络建立 转发链路, 并将转发链路信息保存在存储模块 4 中的信元转发表 中, 存储完毕后通过信令发送模块 5 通知源节点可以随时发送业 务流。
当 ATM/IP双栈 Hub通过信元接收模块 6接收到 ATM信元(或 报文接收模块 11接收到 IP报文)时, 通过信元查找模块 7查找存 储模块 4的信元转发表(或通过报文查找模块 12查找存储模块 4 的报文转发表), 获取转发链路信息, 当转发链路信息指示:
情况一, 将 ATM信元通过 IP 网络传输时, 通过第一协议转 换模块 8 中的转换协议将 ATM信元封装成 IP报文, 重新封装后 的 IP报文通过路由模块 9分配路由,通过报文发送模块 10向目的 节点发送 IP报文。
情况二, 将 ATM信元通过 ATM网络传输时, 通过汇聚模块 14 对 ATM信元执行 PVC交换或者 AAL2交换以汇聚 ATM信元, 通过 信元发送模块 15进行发送。
在上述情况一和情况二中, 当源节点为 ATM基站时, 目的节点 为 ATM/IP双栈基站控制器;当源节点为 ATM/IP双栈基站控制器时, 目的节点为 ATM基站。
情况三, 将 IP报文通过 ATM网络传输时, 通过第二协议转换模 块 13中的转换协议将 IP报文封装成 ATM信元,通过汇聚模块 14对 ATM信元执行 PVC交换或者 AAL2交换以汇聚 ATM信元, 通过信 元发送模块 15进行发送。
情况四, 将 IP报文通过 IP网络传输时, 直接将报文接收模块 11 接收的 IP报文通过路由模块 9分配路由,再经过报文发送模块 10进 行发送。
同理, 在上述情况三和情况四中, 当源节点为 IP基站时, 目的 节点为 ATM/IP双栈基站控制器; 当源节点为 ATM/IP双栈基站控制 器时, 目的节点为 IP基站。
在上述过程中, 图 11中的虚线表示 ATM信元的链路, 实线表示 IP报文的链路。
通过本实施例提供的装置实现了业务流的均衡处理,提高了系统 性能。
通过上述实施例的描述, 本发明实施例的技术方案具有以下优 点:
通过信令面的准入控制, 在数据流建立的时候, 通过中继节点与 源节点、 目的节点的信令协商, 获取当前中继节点与源节点、 以及中 继节点与目的节点之间的多个承载网络的链路负荷信息,选择链路负 荷小的承载网络建立链路, 进行数据流的负荷分担配置, 提高了承载 网络的利用效率。 在图 6所示的架构中, 由于基站 (ATM基站或 IP 基站 )和 ATM/IP双栈基站控制器之间仅需要一个 ATM/IP双栈 Hub 设备即可完成 IP和 ATM数据流之间的相互转换,有效节约了设备的 购置成本以及后期的维护成本。
本领域技术人员可以理解附图只是一个优选实施例的示意 图, 附图中的模块或流程并不一定是实施本发明所必须的。
本领域技术人员可以理解实施例中的装置中的模块可以按照 实施例描述分布于实施例的装置中, 也可以进行相应变化位于不 同于本实施例的一个或多个装置中。 上述实施例的模块可以合并 为一个模块, 也可以进一步拆分成多个子模块。
上述本发明实施例序号仅仅为了描述, 不代表实施例的优劣。 权利要求的内容记载的方案也是本发明实施例的保护范围。 通过以上的实施方式的描述,本领域的技术人员可以清楚地了解 到本发明, 可以通过硬件实现, 也可以借助软件加必要的通用硬件平 台的方式来实现。基于这样的理解, 本发明的技术方案可以以软件产 品的形式体现出来, 该软件产品可以存储在一个非易失性存储介质 (可以是 CD-ROM, U盘, 移动硬盘等) 中, 包括若干指令用以使 得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备等) 执行本发明各个实施例所述的方法。
总之, 以上所述仅为本发明的较佳实施例而已, 并非用于限定本 发明的保护范围。 凡在本发明的精神和原则之内所作的任何修改、 等 同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求
1、 一种均衡流量的方法, 其特征在于, 包括:
中继节点接收源节点发送的业务流建链请求;
所述中继节点根据所述业务流建链请求获取所述源节点与目的 节点之间各个承载网络的链路负荷信息,选择链路负荷小的承载网络 建立业务流的转发链路;
所述中继节点根据所述转发链路转发所述业务流。
2、 如权利要求 1所述的方法, 其特征在于, 所述中继节点选择 链路负荷小的承载网络建立业务流的转发链路之后, 还包括:
通知所述源节点链路建立成功。
3、 如权利要求 1所述的方法, 其特征在于, 所述中继节点选择 链路负荷小的承载网络建立业务流的转发链路之后, 还包括:
将所述业务流的转发链路信息保存到本地转发表中,所述中继节 点根据所述本地转发表中的转发链路信息转发所述业务流。
4、 如权利要求 3所述的方法, 其特征在于, 还包括:
所述中继节点接收业务流的拆链请求,根据所述拆链请求移除所 述本地转发表中所述业务流的转发链路信息, 更新本地转发表。
5、 如权利要求 3所述的方法, 其特征在于, 所述源节点为 ATM 基站、 所述中继节点为 ATM/IP双栈 Hub、 所述目的节点为 ATM/IP 双栈基站控制器,所述中继节点根据所述本地转发表中的转发链路信 息转发所述业务流包括:
接收所述 ATM基站发送的 ATM信元;
根据所述 ATM信元的头部信息查找所述本地转发表, 获取所述 ATM信元的转发链路信息;
当所述转发链路信息指示将所述 ATM信元通过 IP网络传输时, 将所述 ATM信元封装成 IP报文, 向 ATM/IP双栈基站控制器转发所 述封装后的 IP报文; 或者
当所述转发链路信息指示将所述 ATM信元通过 ATM网络继续 传输时, 向所述 ATM/IP双栈基站控制器转发所述 ATM信元。
6、如权利要求 3所述的方法,其特征在于,所述源节点为 ATM/IP 双栈基站控制器、 所述中继节点为 ATM/IP双栈 Hub、 所述目的节点 为 ATM基站, 且所述 ATM/IP双栈 Hub与所述 ATM/IP双栈基站控 制器之间的转发链路的承载网络为 ATM网络, 所述中继节点根据所 述本地转发表中的转发链路信息转发所述业务流包括:
接收所述 ATM/IP双栈基站控制器发送的 ATM信元;
根据所述 ATM信元的头部信息查找所述本地转发表, 获取所述 ATM信元的转发链路信息;
根据所述转发链路信息向所述 ATM基站转发所述 ATM信元。
7、如权利要求 3所述的方法,其特征在于,所述源节点为 ATM/IP 双栈基站控制器、 所述中继节点为 ATM/IP双栈 Hub、 所述目的节点 为 IP基站,且所述 ATM/IP双栈 Hub与所述 ATM/IP双栈基站控制器 之间的转发链路的承载网络为 ATM网络, 所述中继节点根据所述本 地转发表中的转发链路信息转发所述业务流包括:
接收所述 ATM/IP双栈基站控制器发送的 ATM信元;
根据所述 ATM信元的头部信息查找所述本地转发表, 获取所述
ATM信元的转发链路信息;
根据所述转发链路信息将所述 ATM信元封装成 IP报文,向所述
IP基站转发所述封装后的 IP报文。
8、如权利要求 5或 7所述的方法,其特征在于,所述将所述 ATM 信元封装成 IP报文包括:
终结所述 ATM信元的 ATM适配层 2 AAL2协议, 将所述 ATM 信元的信元净荷封装成所述 IP报文。
9、 如权利要求 3所述的方法, 其特征在于, 所述源节点为 IP基 站、 所述中继节点为 ATM/IP双栈 Hub、 所述目的节点为 ATM/IP双 栈基站控制器,所述中继节点根据所述本地转发表中的转发链路信息 转发所述业务流包括:
接收所述 IP基站发送的 IP报文;
根据所述 IP报文的头部信息查找所述本地转发表, 获取所述 IP 报文的转发链路信息; 当所述转发链路信息指示将所述 IP报文通过 ATM网络传输时, 将所述 IP报文封装成 ATM信元, 向所述 ATM/IP双栈基站控制器转 发所述 ATM信元; 或者
当所述转发链路信息指示将所述 IP报文通过 IP 网络继续传输 时, 向 ATM/IP双栈基站控制器转发所述 IP报文。
10、如权利要求 3所述的方法,其特征在于,所述源节点为 ATM/IP 双栈基站控制器、 所述中继节点为 ATM/IP双栈 Hub、 所述目的节点 为 ATM基站, 且所述 ATM/ IP双栈 Hub与所述 ATM/IP双栈基站控 制器之间的转发链路的承载网络为 IP 网络, 所述中继节点根据所述 本地转发表中的转发链路信息转发所述业务流包括:
接收所述 ATM/IP双栈基站控制器发送的 IP报文;
根据所述 IP报文的头部信息查找所述本地转发表, 获取所述 IP 报文的转发链路信息;
根据所述转发链路信息将所述 IP报文封装成 ATM信元,向所述 ATM基站转发所述 ATM信元。
11、如权利要求 3所述的方法,其特征在于,所述源节点为 ATM/IP 双栈基站控制器、 所述中继节点为 ATM/IP双栈 Hub、 所述目的节点 为 IP基站,且所述 ATM/IP双栈 Hub与所述 ATM/IP双栈基站控制器 之间的转发链路的承载网络为 IP 网络, 所述中继节点根据所述本地 转发表中的转发链路信息转发所述业务流包括:
接收所述 ATM/IP双栈基站控制器发送的 IP报文;
根据所述 IP报文的头部信息查找所述本地转发表, 获取所述 IP 报文的转发链路信息;
根据所述转发链路信息向所述 IP基站转发所述 IP报文。
12、 如权利要求 9或 10所述的方法, 其特征在于, 所述将所述 IP才艮文封装成 ATM信元包括:
终结所述 IP报文的用户数据报协议 UDP协议, 将所述 IP报文 的报文净荷封装成所述 ATM信元。
13、 一种均衡流量的装置, 其特征在于, 包括:
信令接收模块, 用于接收源节点发送的业务流建链请求; 获取模块,用于根据所述业务流建链请求获取所述源节点与目的 节点之间各个承载网络的链路负荷信息;
链路选择模块,用于根据所述承载网络的链路负荷信息选择链路 负荷小的承载网络建立业务流的转发链路。
14、 如权利要求 13所述的装置, 其特征在于, 还包括: 存储模块,用于将所述业务流的转发链路信息存储在本地转发表 中。
15、 如权利要求 14所述的装置, 其特征在于, 还包括: 信令发送模块, 用于通知所述源节点链路建立成功。
16、 如权利要求 13所述的装置, 其特征在于, 还包括: 信元接收模块, 用于接收所述源节点发送的 ATM信元; 信元查找模块, 用于根据所述 ATM信元的头部信息查找本地转 发表中的信元转发表; 获取所述 ATM信元的转发链路信息;
第一协议转换模块, 用于将所述 ATM信元封装成 IP报文; 路由模块, 用于分配所述 IP报文的路由;
报文发送模块, 用于发送所述 IP报文。
17、 如权利要求 13所述的装置, 其特征在于, 还包括: 报文接收模块, 用于接收所述源节点发送的 IP报文;
报文查找模块, 用于根据所述 IP报文的头部信息查找本地转发 表中的报文转发表; 获取所述 IP报文的转发链路信息;
第二协议转换模块, 用于将所述 IP报文封装成 ATM信元; 汇聚模块, 用于汇聚所述 ATM信元;
信元发送模块, 用于发送所述 ATM信元。
18、 一种均衡流量的系统, 其特征在于, 包括: 源节点、 中继节 点、 以及目的节点; 其中,
所述源节点, 用于发送业务流和所述业务流的业务流建链请求; 所述中继节点, 用于接收所述源节点发送的所述业务流建链请 求,根据所述业务流建链请求获取所述源节点与所述目的节点之间各 个承载网络的链路负荷信息 ,选择链路负荷小的承载网络建立所述业 务流的转发链路, 根据所述转发链路转发所述业务流; 所述目的节点, 用于接收所述中继节点转发的所述业务流。
19、 一种 ATM协议栈到 IP协议栈的转换方法, 其特征在于, 包 括:
根据 ATM信元的头部信息查找本地转发表, 获取所述 ATM信 元的转发链路信息;
当所述转发链路信息指示将所述 ATM信元通过 IP网络传输时, 将所述 ATM信元封装成 IP报文, 向 ATM/IP双栈基站控制器转发所 述 "¾文; 或者,
根据所述转发链路信息将所述 ATM信元封装成 IP报文, 向 IP 基站转发所述 IP报文。
20、 如权利要求 19所述 ATM协议栈到 IP协议栈的转换方法, 其特征在于, 所述将所述 ATM信元封装成 IP >¾文包括:
终结所述 ATM信元的 ATM适配层 2 AAL2协议, 将所述 ATM 信元的信元净荷封装成所述 IP报文。
21、 一种 IP协议栈到 ATM协议栈的转换方法, 其特征在于, 包 括:
根据 IP报文的头部信息查找本地转发表, 获取所述 IP报文的转 发链路信息;
当所述转发链路信息指示将所述 IP报文通过 ATM网络传输时, 将所述 IP报文封装成 ATM信元, 向 ATM/IP双栈基站控制器转发所 述 ATM信元; 或者,
根据所述转发链路信息将所述 IP报文封装成 ATM信元,向 ATM 基站转发所述 ATM信元。
22、 如权利要求 21所述 IP协议栈到 ATM协议栈的转换方法, 其特征在于, 所述将所述 IP >¾文封装成 ATM信元包括:
终结所述 IP报文的用户数据报协议 UDP协议, 将所述 IP报文 的报文净荷封装成所述 ATM信元。
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