WO2008019619A1

WO2008019619A1 - Multi-service multi-edge equipment and system

Info

Publication number: WO2008019619A1
Application number: PCT/CN2007/070441
Authority: WO
Inventors: Ruobin Zheng
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-08-09
Filing date: 2007-08-09
Publication date: 2008-02-21
Also published as: CN100589428C; CN101123564A

Abstract

A multi-service multi-edge equipment and system is provided. The equipment mainly comprises an access network edge node equipment. The system mainly includes an access network system and a multi-service multi-edge system. The access network system mainly comprises: a SP (service provider) and an access network. The multi-service multi-edge system mainly includes: at least two of access network systems interconnected via an access network edge node equipment, and the access network edge node equipment of each access network system only connects with a corresponding SP thereof. With the equipment and system of the solution, thus in the case ofsimplifying the function of an access network edge node and reducing the cost of the access network edge node, the multi service is provided to a user via the access network.

Description

Manual Multi-service multi-edge devices and systems

[1] Technical field

[2] The present invention relates to the field of network communications, and in particular, to a multi-service multi-edge device and system.

[3] Background Art

[4] In the wireless communication system, the general reference architecture of the access network is shown in Figure 1, including: CPN (customer premises network), Access Network (Access Network), and SP (Service Provider). Business) three parts. Among them, CPN by UE (customer

Equipment, user equipment) and RG (Residential

Gateway, resident gateway); access network by AN (Access

Node , access node ) and EN (edge

Node, edge node) and the aggregation network between the two (not shown in Figure 1); the access network is connected to the SP, the SP can be an ASP (Application Service Provider) or NSP (Network Service Provider, Network Business provider).

[5] For WiMAX (World Interoperability for Microwave

Access, Microwave Access Global Internet), EN is ASN (Access Service

Network, access service network)

GW (Gateway, gateway), AN is BS (base station); for DSL (Digital Subscriber Line) network, EN is BRAS (BRAS, Broadband Remote Access Server, Broadband Access Server) / BNG (Broadband Network)

Gateway, broadband network gateway), AN is DSLAM (DSL Access

Multiplexer, Digital Subscriber Line Access Multiplexer).

[6] In practical applications, operators need to introduce a large number of new services, such as IPTV (IP TV), VoIP (IP voice) and some multimedia services such as online games. Some of these multimedia services have different requirements for bearer networks than traditional Internet access, such as bandwidth requirements, QoS (quality of service) requirements, scalability, and reliability requirements. The current metropolitan area network architecture is designed only for best-effort Interne t access, and does not take into account the impact of introducing various multimedia services on the network. [7] The network edge node is the originating point of the related service. Current metropolitan area networks are based on single-edge device architectures.

When a new type of service needs to be added to the metropolitan area network, the different types of services differ in their essential characteristics, so that the network operator provides different types of services on the above-mentioned single edge device at low cost and high efficiency. The more difficult it is. Therefore, in order to adapt to new business needs, network access providers need to use multiple edge devices. By distributing the services provided by different SPs on different edge nodes, the multiple edge devices can provide great flexibility for implementing and providing various new service types, which can greatly improve network scalability and reliability. . For services with redundancy requirements, you can flexibly deploy redundant service edge nodes for them.

[8] With the development of optical fiber technology, an access network based on optical fiber technology as shown in FIG. 2 has appeared. Where D

Point). Due to the small attenuation of the fiber, the coverage of DSL and wireless cellular networks can be extended to tens of kilometers by the above DSLoF and RoF technologies, and Remote

The DSLAM, BS or AP basically does not require software upgrades and maintenance, and can be made into a maintenance-free, closed device placed at a node close to the user.

[9] Fiber-based access networks mainly include: OLT (optical line

Terminaton, optical path termination), ODN (Optical Distribution)

Network, optical distribution network) and ONU/ONT (optical network unit, optical network unit / Optical

Network Termination, Optical Network Terminal). Where OLT is implemented in CS (Central)

Station, Central Station). In order to support DSLoF and RoF, CS also implements Layer 2 of DSLAM and BS/AP.

, more than two layers and some physical layer mixing functions, Remote

The DSLAM BS or AP can be connected via ODN and CS. CS is equivalent to an edge node in an access network based on fiber technology.

[10] A schematic diagram of a single edge multi-service network in the prior art is shown in FIG. 3. In this scenario, AN corresponds to a single BNG or BRAS or ASN

GW, all SP services are connected to a single BNG or BRAS or ASN

On the GW, the access server controls the user's selection of the service provider and the subsequent service flow processing. [11] In the process of implementing the present invention, the inventors found that the disadvantages of the architecture of the single edge multi-service network described above are: [12] 1

Since different SP services are converged to the same BNG/BRAS, in order to isolate the services of different SPs, BNG/BRAS must support virtual router technology, that is, multiple virtual IP domains must be simulated on BNG/BRAS. The SPs belong to different virtual IP domains. Therefore, the BNG/BRAS function will be complicated and costly; for each SP, the IP address will be reassigned to all edge nodes, and the impact on the BNG and AN network will be greater;

[13] 2

Due to the difference in service characteristics provided by different SPs, BNG/BRAS needs to support various service features, that is, for each new service added, it is necessary to add related feature support to BNG/BRAS; and all users are authenticated, Control flow such as billing also needs to be supported on BNG/BRAS, which results in a variety of functions that BNG/BR AS needs to support, and poor scalability, which causes BNG BRAS to become the bottleneck of the entire network; [14] 3

The architecture of the single-edge multi-service network is designed only for best-effort Internet access. When high-bandwidth, QoS-supported services such as _{ΙΡΤνΙΡΤ} , the architecture will face bandwidth shortages and QoS cannot be guaranteed. .

[15] A schematic diagram of a multi-edge multi-service network in the prior art is shown in FIG. 4. The AN is connected to multiple BNGs, and each SP is also connected to a different BNG.

[16] In the process of implementing the present invention, the inventors found that the disadvantages of the architecture of the above multi-edge multi-service network are: [17] All ANs must be interconnected with BNGs corresponding to different SPs, each adding one SP, Peer-to-peer also adds a BNG, which is to double the access network connection. All ANs must also add an uplink port. Therefore, although the scheme avoids the bottleneck of BNG, it has a greater impact on the transformation of the access network.

, the cost is high, and the scalability of the network is not good.

[18] In particular, when a new network based on fiber technology as shown in Figure 2 is to be developed in this architecture, a new R emote is added.

The DSLAM BS or AP will be connected to the new CS, and it is almost impossible to connect to the original BNG. If you add Remote

If the DSLAM BS or AP is connected to the original BNG, the original BNG needs to be enhanced to the DSLAM and BS. The support of the /AP's Layer 2, Layer 2 and above and some physical layer hybrid functions will increase the complexity of the original BNG.

[19] A similar problem arises when adding a WiMAX network to the architecture. The new BS is connected to the new ASN.

On the GW, it is basically impossible to connect with the original BNG, and the original AN cannot be connected to the newly added A SN GW. In this case, how to provide multiple services is an urgent problem to be solved.

[20] Summary of the invention

[21] An object of the present invention is to provide a multi-service multi-edge device and system, thereby providing users with more access through the access network while simplifying the function of the edge node of the access network and reducing the cost of the edge node of the access network. business.

[22] The object of the present invention is achieved by the following technical solutions:

[23] An access network edge node device, comprising:

[24] User side port communication module: used for communicating with an access network access node;

[25] Network side port communication module: used to communicate with an external network node of the access network;

[26] Edge node interconnection communication module: used to implement access network edge node equipment and other access network edge node device interconnection communication;

[27] IP routing module: used to implement the IP routing function of the edge node device of the access network;

[28] Bridge Module: Used to implement access bridge edge node device support bridging function.

[29] An access network system, comprising an access network edge node device and an access node AN, wherein the access network edge node device is connected to the SP and the AN, and communicates with the SP and the AN.

[30] A multi-service multi-edge system, comprising: at least two access network systems, each access network system by an access network edge node device and other access according to any one of claims 1 to The network system is interconnected, and the access network edge node device of each access network system is only connected to the SP corresponding to the access network system.

As can be seen from the technical solution provided by the present invention, the present invention expands the functions of an access network edge node (for example, CS), and connects multiple access networks through an access network edge node. In the implementation of multi-service, it is not necessary to simulate multiple virtual IP domains on the access network edge node device, which simplifies the function of the access network edge node device and reduces the cost of the access network edge node device.

[32] The present invention introduces a multi-edge structure, which avoids an access network edge node in an existing single-edge multi-service access network. The device becomes a bottleneck.

[33] BRIEF DESCRIPTION OF THE DRAWINGS

[34] FIG. 1 is a schematic diagram of a general reference architecture of an existing universal access network;

[35] Figure 2 is a schematic diagram of an existing access network based on fiber technology;

[36] FIG. 3 is a schematic structural diagram of a single edge multi-service network in the prior art;

[37] FIG. 4 is a schematic structural diagram of a multi-edge multi-service network in the prior art;

FIG. 5 is a schematic structural diagram of an embodiment of an edge node device according to the present invention; FIG.

6 is a schematic structural diagram of Embodiment 1 of a multi-service multi-edge system according to the present invention;

FIG. 7 is a schematic diagram of a logical connection in Embodiment 1 of the multi-service multi-edge system according to the present invention; FIG. 8 is a schematic diagram of Embodiment 1 of the multi-service multi-edge system according to the present invention; FIG. 9 is a schematic diagram of a logical connection in Embodiment 1 of the multi-service multi-edge system according to the present invention; [43] FIG. 10 is a second embodiment of the multi-service multi-edge system of the present invention Schematic;

11 is a schematic structural diagram of Embodiment 3 of the multi-service multi-edge system of the present invention;

[45] FIG. 12 is a schematic diagram of the ARP proxy process of the CS in FIG. 6;

[46] FIG. 13 is a schematic diagram of the IP bridging/routing mixing process of the CS in FIG. 6;

14 is a schematic diagram of NAS and AR proxy functions of a CS in a multi-service multi-edge system according to the present invention; [48] FIG. 15 is a NAS and AR proxy function of a CS in a multi-service multi-edge system according to the present invention; Schematic diagram of the specific implementation process;

16 is a schematic diagram of a DHCP Proxy/Relay function of a CS in a multi-service multi-edge system according to the present invention; [50] FIG. 17 is a DHCP of a CS in a multi-service multi-edge system according to the present invention;

Schematic diagram of the specific implementation process of the Proxy/Relay function.

[51] Specific implementation

[52] The present invention provides a multi-service multi-edge device and system. The present invention extends the function of an edge node in an access network, and interconnects the access network and the access network through edge nodes. The edge nodes of the access networks are only connected to the SPs and ANs corresponding to the access network.

[53] The multi-service multi-edge system of the present invention is composed of respective access networks interconnected by edge node devices, and the edge node devices of each access network are only connected to the SPs and ANs corresponding to the access network. The foregoing access network includes: an access network such as a DSL access network, a WIMAX access network, and an optical access network based on optical fiber technology. [54] The structure of the embodiment of the edge node device described above is as shown in FIG. 5, and must include the following modules:

[55] User side port communication module: used for communicating with an access node of an access network;

[56] Network side port communication module: used for communicating with an external network node of the access network;

[57] Edge node interconnection communication module: used to implement access network edge node equipment and other access network edge node device interconnection communication;

[58] IP routing module: It is used to implement the IP routing function of the access network edge node device; [59] Bridging module: It is used to implement the bridging function of the access network edge node device. The bridging module includes: an IP bridging module and a Layer 2 bridging module.

[60] Among them, the IP bridging module: is used to implement the two-layer and three-layer hybrid functions of the edge node device of the access network to support IP routing and IP bridging.

[61] Among them, the second layer bridge module: used to implement the access network edge node device to support IP routing and Layer 2 bridge mixing function.

[62] The foregoing edge node device may further include the following modules:

[63] Access Node Interconnect Module: Used to interconnect access node equipment of access network edge node equipment and other access networks.

[64] ARP (Address Resolution

Protocol, Address Resolution Protocol) Agent module: Used to implement the ARP proxy for the edge node device of the access network.

[65] DHCP (Dynamic Host Configuration

Protocol, Dynamic Host Configuration Protocol) Module: Used to implement access network edge node devices to support DHCP proxy or transit.

[66] NAS (Network Access Server, Network Access Server) and AR (Authentication)

Relay, authentication relay) Module: Used to implement access network edge node devices to support NAS and AR agents.

[67] Based on the above-mentioned access network edge node device, the present invention provides an access network system, which mainly includes: an SP (service provider) and an access network.

[68] SP: is connected to and communicates with an access network edge node device in the access network;

[69] Access network: The foregoing access network edge node device and the AN are connected, and the access network edge node device is connected to the SP and the AN, and communicates with the SP and the AN. [70] Based on the foregoing access network system, the present invention also provides a multi-service multi-edge system, the multi-service multi-edge system mainly includes:

[71] At least two of the foregoing access network systems interconnected by the access network edge node device, the access network edge node device of each access network system is only connected to the SP corresponding to the access network system.

The present invention is described in detail below with reference to the accompanying drawings. The structure of Embodiment 1 of the multi-service multi-edge system of the present method is as shown in FIG. 6, and includes the following units: DSL access network unit and access based on optical fiber technology. Network unit

[73] DSL

Access network unit: Includes BNG/BRAS equipment, aggregation network and AN. The BNG BRAS device acts as the IP edge node of the DSL access network, connects its corresponding SPs in the SP and DSL access networks that are not connected to other BNG/BRAS devices, and peers, through the aggregation network in the DSL access network and based on The CS devices in the access network unit of the fiber technology are connected.

[74] Access network elements based on fiber technology: including CS equipment, ODN and BS/AP/Remote

The DSLAM/ONU/ONTo CS device acts as an IP edge node of the access network based on fiber technology, connecting its corresponding SPs connected to other CS devices and ODNs in the fiber-based access network, peers, and DSLs. The aggregation network in the access network is connected. There can be an ER (edge router) between the SP and the CS device.

The ER acts as an interconnect route between the SP and the CS.

[75] Each BNG/BRAS device includes the following modules:

[76] network side port communication module: for communicating with an external network node of the access network;

[77] Edge node interconnection communication module: used to implement interconnection communication between BNG/BRAS devices and other access network edge node devices;

[78] IP routing module: used to implement BNG/BRAS devices to support IP routing functions;

[79] Bridge Module: Used to implement BNG/BRAS devices to support bridging. The bridging module includes: an IP bridging module and a Layer 2 bridging module.

[80] Among them, IP bridging module: used to implement BNG BRAS equipment to support IP bridging function. The gPBNG BRAS device can be used as a special IP edge node or as a special AN.

[81] Among them, the two-layer bridge module: used to implement BNG/BRAS equipment to support Layer 2 bridging function.

[82] Each CS device includes the following modules: [83] Network side port communication module: used for communicating with an external network node of the access network;

[84] Edge Node Interconnect Communication Module: Used to implement CS device and other access network edge node device interconnection communication

[85] IP routing module: used to implement CS device support IP routing function;

[86] Bridge Module: Used to implement CS device support bridging. The bridging module includes: an IP bridging module and a Layer 2 bridging module.

[87] Among them, the IP bridge module: used to implement CS bridge support IP bridge function. That is, the CS device can be used as a special IP edge node or as a special AN.

[88] As shown in Figure 6, for SP1, BNG1 is an IP edge node, and CS is a special AN of BNG1, which supports IP bridging or Layer 2 bridging. For SP2, CS is an IP edge node and supports IP routing. Function: If CS does not support AN interconnection with DSL access network, Bay I" BNG1, as a special AN of CS, must support IP bridging or Layer 2 bridging.

[89] Layer 2 Bridge Module: Used to implement CS device support Layer 2 bridge function.

[90] AN

Interconnect module: used to connect to the aggregation network in the DSL access network, and interconnect the AN equipment in the DSL access network through the aggregation network.

[91] ARP proxy module: Used to implement CS device support ARP proxy function.

[92] DHCP proxy module: Used to implement CS device support ARP proxy or transit function.

[93] NAS and AR modules: Used to implement CS devices supporting NAS and AR proxy functions.

[94] Since the CS device is an IP edge node in the access network based on the optical fiber technology, the CS device further includes:

[95] DSLoF

Module: It is used to implement the Layer 2, Layer 2 and above and some physical layer functions of the CSLAM to support the DSLAM, that is, the DSLoF function is implemented. Connect the CS device to the Remote DSLAM via ODN.

[96] RoF

Module: It is used to implement the Layer 2, Layer 2 and above and part of the physical layer functions of the CS device supporting the BS/AP, that is, the RoF function is implemented. The CS device is connected to the BS/AP through the ODN. Alternatively, the CS device supports the function of the ASN GW, so that the CS device connects to the BS through the ODN. [97] OLT

Module: Used to implement CS device support OLT function, so that CS device connects with ONU/ONT through ODN.

[98] A schematic diagram of the logical connections in this embodiment is shown in FIGS.

[99] As shown in Figure 7, SP1 passes BNG/BRAS1->CS -> BS/AP/Remote

The DSLAM/ONU/ONT path provides services to the new fiber-based technology-based access network; SP2 directly passes CS->BS/AP/Remote

The DSLAM/ONU/ONT path provides services to the new fiber-based technology-based access network.

[100] As shown in Figure 8, SP1 directly provides services to the DSL access network through the path of BNG/BRAS1->AN;

CS does not support AN interconnection with DSL access network. Bay I” BNG/BRAS1 is a special AN of CS, providing IP bridging or Layer 2 bridging. So, SP2 passes CS->BNG/BRAS

1-> AN's path provides services to the DSL access network.

[101] As shown in FIG. 9, when the CS supports the AN interconnection with the DSL access network, the SP2 provides the service to the DSL access network through the path of the CS->AN; and the SP1 directly passes the BNG BRAS1->AN. Path to provide services to DS

L access network.

[102] The structure of Embodiment 2 of the multi-service multi-edge system of the present method is as shown in FIG. 10, and includes: a DSL access network unit and a WIMAX access network unit.

[103] DSL

Access network unit: Includes: BNG/BRAS equipment and AN. The BNG BRAS device acts as the IP edge node of the DSL access network, and connects its corresponding AN in the SP and DSL access networks that are not connected to other BNG BRAS devices, and is connected to the ASN GW device in the WIMAX access network unit. .

[104] WIMAX Access Network Unit: Includes: ASN GW equipment and BS. ASN

The GW device acts as the edge node of the WIMAX access network, connecting its corresponding non-other ASNs.

The SP connected to the GW device and the BS in the WIMAX access network, peers, and BNG/BRA in the DSL access network

The S device is connected.

[105] The logical connection process in this embodiment is:

[106] The SP connected to the BNG/BRAS device passes BNG/BRAS to ASN

The GW to BS path provides services to the WIMAX access network; the ASN

The SP connected by the GW device provides a service to the WIMAX access network through the path of the ASN GW to the BS; [107] The SP connected by the BNG/BRAS device provides a service to the DSL access network through a path of the BNG/BRAS to the AN; the SP connected by the ASN GW device passes the ASN.

The path from the GW to the BNG/BRAS to the AN provides services to the DSL access network.

[108] The structure of Embodiment 3 of the multi-service multi-edge system of the present method is as shown in FIG. 11, and includes the following units:

[109] Fiber-based access network 1 Unit: Includes AN in CS1 equipment, ODN, and fiber-based access networks. The CS1 device acts as an IP edge node of the access network 1 based on the optical fiber technology, and connects its corresponding SP that is not connected to other CS devices and the ODN in the optical fiber-based access network 1, the same, and the fiber-based technology-based connection. The CS2 devices in network 2 are connected.

[110] Fiber-based access network 2 Units: AN in CS2 equipment, ODN and fiber-based access networks. The CS2 device acts as an IP edge node of the access network 2 based on the optical fiber technology, and connects its corresponding SP that is not connected to other CS devices and the ODN in the optical fiber-based access network 2, and the optical fiber-based connection. The CS1 devices in network 1 are connected.

[111] Each CS device includes the following modules:

[112] network side port communication module: used for communicating with an external network node of the access network;

[113] edge node interconnection communication module: used to implement access network edge node equipment and other access network edge node device interconnection communication;

[114] IP routing module: used to implement CS device support IP routing function;

[115] Bridge Module: Used to implement CS device support bridging. The bridging module includes: an IP bridging module and a Layer 2 bridging module.

[116] Among them, IP bridging module: used to implement CS bridge support IP bridging function. That is, the CS device can be used as a special IP edge node or as a special AN. That is, the CS device can be used as a special IP edge node or as a special AN.

[117] As shown in Figure 12, for SP1, CS1 is an IP edge node and supports IP.

Routing function, CS2 as a special AN of CS1, support IP

Bridging or Layer 2 bridging; for SP2, CS2 is an IP edge node, supporting IP

Routing function, CS1 as a special AN of CS2, support IP

Bridging or Layer 2 bridging.

[118] Among them, the second layer bridge module: used to implement the CS device to support the Layer 2 bridge function. [119] Access Node Interconnect Module: Used to interconnect access node equipment of an access network edge node device and other access networks.

[120] ARP proxy module: Used to implement CS device support ARP proxy function.

[121] DHCP Proxy: Used to implement CS device support DHCP proxy or transit function.

[122] NAS and AR modules: Used to implement CS devices supporting NAS and AR proxy functions.

[123] DSLoF

[124] RoF

Module: It is used to implement the Layer 2, Layer 2 and above and some physical layer functions of the CS device supporting BS/AP, that is, the RoF function is implemented. The CS device is connected to the BS/AP through the ODN.

[125] OLT

[126] The process of logical connection in the above embodiment 3 is:

[127] SP1 via CSl-> and CS1 connected to BS/AP/Remote

The DSLAM/ONU/ONT path provides services to the fiber-optic technology-based access network where CS1 is located; SP1 also connects to BS/AP/Remote via CS 1 -> CS2-> and CS2.

The DSLAM/ONU/ONT path provides services to the fiber-optic technology-based access network where CS2 resides.

[128] SP2 via CS2-> and CS2 connected to BS/AP/Remote

The DSLAM/ONU/ONT path provides services to the fiber-optic technology-based access network where CS2 is located; SP2 also connects to BS/AP/Remote via CS2->CS 1 ->3⁄4CS 1

The path of the DSLAM/ONU/ONT provides services to the fiber-optic technology-based access network where CS 1 is located.

[129] Embodiment 4 of the multi-service multi-edge system of the method includes the following units:

[130] DSL

Access Network Unit 1: Includes: BNG/BRAS1 equipment and AN. As the IP edge node of the DSL access network 1, the BNG BRAS1 device is connected to its corresponding SP that is not connected to other BNG/BRAS devices, and is connected to the BNG/BRAS2 device in the DS L access network 2;

[131] DSL Access network 2 unit: Includes: BNG/BRAS2 device and AN. The BNG BRAS2 device acts as an IP edge node of the DSL access network 2, and connects its corresponding SP that is not connected to other BNG/BRAS devices, and is connected to the BNG/BRAS1 device in the DS L access network 1.

[132] The process of logical connection in the above embodiment 4 is:

[133] The SP connected by the BNG/BRAS1 device provides traffic to the DSL access network 2 through the path of the BNG/BRAS1 to the BNG/BRAS2 to the AN; the path of the SP connected by the BNG/BRAS2 device passes the BNG/BRAS2 to the AN Provide services to the DSL access network 2;

[134] The SP connected by the BNG/BRAS1 device provides traffic to the DSL access network 1 through the path of the BNG/BRAS1 to the AN; the SP connected by the BNG/BRAS2 device provides the path through the BNG/BRAS2 to the BNG BRAS1 to the AN. The service is sent to the DSL access network 1.

[135] The following takes Figure 7 as an example to illustrate the ARP proxy function and IP of CS.

The bridging/routing hybrid function is similar to the ARP proxy function and the IP bridging/routing hybrid function of the BNG in Fig. 8, Fig. 11, and Fig. 9 and Fig. 10, and the following description.

[136] Assume that RG in CPN is a Layer 2 bridge device, UE

The IP address is IPa, the IP address of BNG/BRAS 1 is IPx, and the MAC address of the UE is MAC1, M of CS

The AC address is MAC2.

The MAC address of BNG/BRAS 1 is MAC4; the CS user port where the UE is located is port x, CS is connected to BNG/BRAS through port n, and CS is connected to SP2 through port t.

[137] CS

The schematic diagram of the ARP proxy process is shown in Figure 12. The CS supports the ARP proxy function, and the ARP is in TCP/I.

A protocol used to convert an IP address into a corresponding MAC address in a P network environment. For users from port X

ARP request (ARP-req), CS responds with ARP reply with MAC address of MAC address (ARP-reply)

) to the user; for from port n

Respond to an ARP reply (ARP-reply).

Since the CS also supports the DHCP proxy or the transit function, the CS can obtain the MAC address of the UE through the DHCP message initiated by the UE, thereby establishing an IP bridge-based IP bridge forwarding table on the CS, and the IP bridge The structure of the forwarding table is shown in Table 1. The IP session is represented by the user-side physical port, the user IP address, and the user's MAC address. The IP service connection is represented by the network-side physical port, the S-VLAN (virtual local area network identifier), and the IP edge node MAC address.

[139] Table 1: IP Bridge Forwarding Table for CS

[140]

[141] The IP of CS in Figure 7

A schematic diagram of the bridging/routing mixing process is shown in Figure 13, where the parentheses indicate a layer of a packet, the IP address is an IP packet, and the MAC address is a MAC frame. CS IP

A detailed description of the bridging/routing mixing process is as follows:

[142] In the up direction:

[143] For packets from the CS user-side port (with MAC frame and IP header), the CS senses traffic based on information such as connection identifier, tunnel identity, or S-VLAN. If the service of the user group belongs to SP2, the IP routing function module of the CS performs corresponding routing processing, and routes to the next hop through the CS network side port t.

[144] If the service of the user group belongs to SP1, the CS checks the IP bridge forwarding table (ie, Table 1) of the CS according to the source IP address of the IP packet (in this example, IPa), and obtains the physical port on the network side (in this example, the port) n), S-VLAN (0111 in this example) and IP edge node MAC address (MAC4 in this example), then change the destination address of the packet's MAC frame to MAC4, and change the source address to CS's MAC address MAC2. Add or modify the S-VLAN in the MAC frame to ΌΙ Ι ; '; then forward the packet to the BNG/BRAS through port n to complete the IP bridging at the node. Port n can also be used

By default, a specific S-VLAN value is bound, such as ΌΙ Ι Ι ', IP service connection is only by S-VLAN and BNG.

The MAC address is characterized. When the lookup table gets the S-VLAN as Ό11 Γ, it is forwarded by port n by default.

[145] In the down direction:

[146] Packets from CS network side port t, via CS IP

The routing function module performs corresponding routing processing, and routes to the next through the port where the corresponding user IP address is located. One jump.

[147] For the packet from the CS network side port n (with MAC frame and IP header), the CS checks the CS IP bridge forwarding table (ie, Table 1) according to the IP packet destination IP address (in this example, IPa), and obtains the user. The physical port of the side (port X in this example) and the MAC address of the user (in this case, MAC1), then change the destination address of the MAC frame of the packet to MAC1, and change the source address to the MAC address of the CS, MAC2; The packet is forwarded to the user via port X, completing the IP bridging at that node.

[148] The detailed description of the IP routing and Layer 2 bridge mixing functions of CS in Figure 7 is as follows:

[149] Upward direction:

[150] For packets from the CS user-side port (with MAC frames and IP headers), the CS senses traffic based on methods such as MAC address, connection identifier, or user VLAN. If the service of the user data belongs to the SP2, the IP routing function module of the CS performs the corresponding routing processing, and the CS network side port t is routed to the next hop; if the service of the user data belongs to the SP1, the CS layer 2 bridge function module performs the The corresponding Layer 2 bridge processing is forwarded to the BNG/BRAS through port n.

[151] Downside direction:

[152] Packets from CS network side port t, via CS IP

The routing function module performs corresponding routing processing, and routes to the next hop through the port where the corresponding user IP address is located; for the packet from the CS network side port n, the CS layer 2 bridge function module performs corresponding layer 2 bridge processing, through the port X Forward to the user.

[153] The NAS and AR proxy functions of the CS in the multi-service multi-edge system of the present invention are as shown in FIG.

The specific implementation process is shown in Figure 15, and the specific implementation process is also applicable to BNG/BRAS/ASN.

GW, the specific description is as follows:

[154] The UE sends an authentication message to CS1 to initiate an authentication process. The authentication message carries a Network Access Identifier (NAI). The NAI is used to indicate which service provider the UE belongs to. The CS1 determines NAS/AAA according to the NAI. The client function is still doing the authentication relay function.

[155] If the NAI indicates that the UE's service belongs to SP1, the shell I"CS1 acts as the NAS/AAA client function to transfer the authentication message to the AAA Server1 for authentication.

[156] If the NAI indicates that the service of the UE belongs to the SP2, the I1 CS1 is used as the AR function to transfer the authentication message to the CS2, and the C22 implements the NAS/AAA client function according to the NAI to transfer the authentication message to the AAA Server2 to complete the authentication. [157] DHCP of CS in the multi-service multi-edge system of the present invention

The schematic diagram of the Proxy/Relay function is shown in Figure 16. The specific implementation process is shown in Figure 17. The specific implementation process is also applicable to the BNG/BRAS/ASN GW. The detailed description is as follows:

[158] UE

A DHCP message is sent to the CS1 to initiate a DHCP process. The DHCP message carries an attribute parameter, which is used to indicate the user terminal type or service type. The CS1 sends a DHCP message to the corresponding SP according to the attribute parameter carried in the DHCP message.

[159] If the attribute parameter carried in the DHCP message indicates that the user terminal type or service type belongs to SP1, CS1 sends a DHCP message as DHCP Proxy/Relay to SP1's DHCP Server1;

[160] If the attribute parameter carried in the DHCP message indicates that the user terminal type or service type belongs to SP2, Shell I" CS1 acts as DHCP.

Relay/Relay transfers the DHCP message to CS2. CS2 implements the DHCP Proxy/Relay function according to the attribute parameters carried in the DHCP message to transfer the DHCP message to DHCP Server2 of SP2.

In summary, the present invention extends the functionality of an access network edge node (e.g., CS) by connecting multiple access networks through an access network edge node. Has the following beneficial effects:

[162] 1

In the implementation of multi-service, BNG/BRAS in the existing DSL access network does not need to support virtual router technology, that is, it does not need to simulate multiple virtual IP domains on BNG/BRAS, which simplifies the function of BNG/BRAS and reduces B NG. BRAS cost.

[163] 2

The introduction of a multi-edge structure avoids the problem that BNG/BRAS in the existing single-edge multi-service access network becomes a bottleneck.

[164] 3

By expanding the functions of CS and adding an access network based on fiber technology, the existing single-edge multi-service access network will face bandwidth shortage and QoS cannot be guaranteed.

[165] 4. New Remote

The DSLAMs BS or AP does not need to be connected to the BNG/BRAS in the original DSL access network, and is interconnected with the BNG/BRAS in the original DSL access network to obtain the original DSL access network. SP Provided business. The original AN can also be interconnected with the BNG/BRAS in the original DSL access network through the CS, thereby obtaining the services provided by the newly added SP. Thus adding a new Remote

The DSLAMs BS or AP and the original AN do not need to increase their uplink ports. The aggregation network in the original DSL access network does not need to be modified. The impact on the original DSL access network is low, and the cost is low. Strong scalability.

[166] Similarly, for adding a WiMAX network to a DSL access network, the new BSP does not need to be connected to the original BNG, through the ASN.

The interconnection between the _GW and the original _BNG is provided by the SP of the original DSL access network, and the AN of the original DSL access network can also pass the ASN.

The interconnection between the _GW and the BNG of the original DSL access network is provided by the service of the newly added SP.

[167] 5

The BNG/BRAS in the original DSL access network does not need to enhance the support of the Layer 2, Layer 2 and above and some physical layer hybrid functions of the DSLAM and the BS/AP, and can coexist with the access network based on the optical fiber technology. , supports DSPoF and RoF.

[168] 6

CS supports the Layer 2 and Layer 3 hybrid functions of IP routing and IP bridging, enabling the entire system to flexibly support multi-service access networks.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of within the technical scope disclosed by the present invention. Changes or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim

[1] 1. An access network edge node device, which is characterized in that:

User side port communication module: used for communicating with an access network access node;

The network side port communication module is configured to communicate with an external network node of the access network; the edge node interconnection communication module is configured to implement interconnection communication between the access network edge node device and other access network edge node devices;

The IP routing module is used to implement the IP routing function of the edge node device of the access network. The bridging module is used to implement the bridging function of the edge node device of the access network.

[2] The access network edge node device according to claim 1, wherein the access network edge node device further includes:

Access node interconnection communication module: used to implement access network edge node equipment and other access network access node equipment interconnection communication.

[3] The access network edge node device according to claim 1, wherein the access network edge node device further comprises an address resolution protocol ARP proxy module, a dynamic host configuration protocol DHC P module, and an authentication module. At least one of them,

ARP proxy module: used to implement access network edge node device support ARP proxy function; DHCP module: used to implement access network edge node device to support DHCP proxy or transit function; authentication module: used to implement access network edge node device support At least one of a network access server NAS function and an authentication relay AR function.

[4] The access network edge node device according to claim 1, wherein the bridge module specifically includes: at least one of an IP bridge module and a second layer bridge module, where

IP bridging module: It is used to implement the IP bridging function of the access network edge node device. The Layer 2 bridging module is used to implement the Layer 2 bridging function of the access network edge node device.

[5] The access network edge node device according to any one of claims 1 to 4, wherein the access network edge node device comprises: a central station CS or a broadband network gateway BNG/broadband access Server device BRAS or access service network gateway ASN GW.

[6] 6. An access network system, comprising: an access network edge node device and an access node A

N, the access network edge node device is connected to the service provider SP, AN, and is performed by SP, AN Communication.

[7] 7. A multi-service multi-edge system, comprising: at least two access network systems, each access network system passing through an access network edge according to any one of claims 1 to 4. The node device is interconnected with other access network systems, and the access network edge node device of each access network system is only connected to the SP corresponding to the access network system.

[8] 8. The multi-service multi-edge system according to claim 7, wherein

When the access network edge node device receives the ARP request from the user port, the ARP proxy module returns an ARP response from the user port by using the MAC address of the access network edge node device;

When the access network edge node device receives an ARP request from a port interconnected with other access network edge node devices, the ARP proxy module uses the MAC address of the access network edge node device from the A port interconnected with other access network edge node devices returns an ARP reply.

[9] 9. The multi-service multi-edge system according to claim 7, wherein

When the access network edge node device receives the packet from the user port, and determines that the service of the packet belongs to the service provider SP connected to the access network edge node device, the IP routing module performs corresponding IP routing. Processing, routing the packet to the SP connected to the access network edge node device;

When the access network edge node device receives the packet from the user port and determines that the service of the packet belongs to the SP connected to other access network edge node devices interconnected by the access network, the IP bridge module performs the corresponding IP Bridging processing or performing corresponding layer 2 bridging processing by the layer 2 bridging module, and forwarding the packet to the other access network edge node device;

When the access network edge node device receives the packet from the network side and the port connected to the SP, the IP routing module performs corresponding IP routing processing, and routes the packet to the next port through the corresponding user IP address. One jump

When the access network edge node device receives a packet from a port interconnected by the network side and other access network edge node devices, performing corresponding IP bridging processing by the IP bridging module or by the Layer 2 bridging module The corresponding Layer 2 bridging process forwards the packet to the user port to which the access network edge node device is connected.

[10] 10. The multi-service multi-edge system according to claim 9, wherein an IP bridge forwarding table in which a correspondence between an IP session and an IP service connection is stored is established in the IP bridging module, the IP The session includes a user-side physical port, a user IP address, and a user's MAC address, and the IP service connection includes a network-side physical port, a virtual local area network identifier S-VLAN, and an IP edge node MAC address; and the IP bridge module rotates according to the IP bridge. Publish completed IP bridging.

[11] 11. The multi-service multi-edge system according to claim 7, wherein

When the access network edge node device receives the authentication message carrying the network access identifier NAI from the user terminal, and determines, according to the NAI, that the service of the user terminal belongs to the SP connected to the edge node device of the access network, The access network edge node device acts as the NAS and the authentication, authorization, and accounting AAA client, and transfers the authentication message to the corresponding AAA server for authentication; when the access network edge node device receives the NAI carrying the user terminal Authenticating the message, and determining, according to the NAI, that the service of the user terminal belongs to an SP connected to another access network edge node device that is interconnected, the access network edge node device is transferred to the authentication message as the authentication relay The other access network edge node device, the other access network edge node device acts as a NA S or AAA client, and transfers the authentication message to the corresponding AAA server for authentication.

[12] 12. The multi-service multi-edge system according to claim 7, wherein

And when the access network edge node device receives the DHCP message carrying the attribute parameter from the user terminal, and determines, according to the attribute parameter, that the service of the user terminal belongs to the SP connected by the access network edge node device, the DHCP The module acts as a DHCP proxy or relays, and forwards the DHCP message to the corresponding DHCP server;

When the access network edge node device receives the DHCP message carrying the attribute parameter from the user terminal, and determines, according to the attribute parameter, the service of the user terminal belongs to the SP connected to the other access network edge node device interconnected by the access terminal, Then, the DHCP module transfers the DHCP message to the other access network edge node device, and the DHCP module of the other access network edge node device acts as a D HCP proxy or transits, and transfers the DHCP message to the corresponding DHCP server.

[13] The multi-service multi-edge system according to any one of claims 7 to 12, wherein the access network comprises: a digital subscriber line DSL access network, and a microwave access global interconnection WIMAX access. Network or access network based on fiber technology.

[14] 14. The multi-service multi-edge system according to claim 13, wherein the multi-service multi-edge system comprises: a DSL access network unit and an access network unit based on optical fiber technology;

DSL

Access network unit: including BNG or BRAS equipment, aggregation network and AN, BNG or BRAS equipment as IP edge nodes of DSL access network, connecting their corresponding SP and DSL access networks that are not connected to other BNG or BRAS equipment The AN is connected to the CS device in the access network unit of the fiber-optic technology through the aggregation network in the DSL access network;

Access network unit based on optical fiber technology: including central station equipment, ODN and AN in fiber-optic technology-based access network, the central station equipment as the IP edge node of the optical fiber-based access network, connecting its corresponding and other The SP connected to the central station equipment and the optical split-network ODN in the optical fiber-based access network are connected to the aggregation network in the DSL access network.

[15] 15. The multi-service multi-edge system according to claim 14, wherein the central station device comprises: a DSL signal transmission DSL signal through a fiber, a wireless signal RoF module and an optical path termination through an optical fiber. At least one of the OLT modules, wherein the DSL signal is transmitted through the optical fiber. The DSPoF module is used to implement the CS device to support the digital subscriber line access multiplexer DSLAM, the second layer, the second layer or more and the partial physical layer hybrid, so that the CS The device is connected to the remote Remote DSLAM through the OD N;

Transmitting a wireless signal through the optical fiber. The RoF module is used to implement the CS device supporting the base station BS or the access point AP, and the second layer, the second layer or more, and the part of the physical layer are mixed, so that the CS device is connected to the BS or the AP through the ODN; or, the CS is implemented. The device supports the ASN GW to enable the CS device to connect to the BS through the ODN. The optical path termination OLT module is used to implement the CS device to support the OLT, so that the CS device can connect to the optical network unit ONU or the optical network terminal ONT through the ODN.

[16] 16. The multi-service multi-edge system according to claim 15, wherein:

The SP connected to the BNG or BRAS device passes the BNG or BRAS to the central station to the BS or AP or Re mote

The path of the DSLAM or ONU or ONT provides services to the fiber-optic technology-based access network;

', the SP connected to the station device passes through, to the BS or AP or Remote

The path of the DSLAM or ONU or ONT provides services to the access network based on fiber technology; The SP connected to the BNG or BRAS device provides a service to the DSL access network through a BNG or BRAS to AN path;

If the central station device does not support the AN interconnection with the DSL access network, the B" or BRAS device implements IP bridging or Layer 2 bridging, and the SP connected by the central station passes the path from the central station to the BNG or BRAS device to the AN. The service is provided to the DSL access network; otherwise, the SP connected to the central station provides services to the DSL access network through the path from the central station to the AN.

[17] 17. The multi-service multi-edge system according to claim 13, wherein the multi-service multi-edge system comprises: a DSL access network unit and a WIMAX access network unit,

DSL

Access network unit: Includes: BNG or BRAS equipment and AN, BNG or BRAS equipment as IP edge nodes of the DSL access network, connecting their corresponding SPs in the SP and DSL access networks that are not connected to other BNG or BRAS equipment , at the same time, connected to the ASN GW device in the WIMAX access network unit;

WIMAX access network unit: Includes: ASN GW equipment and BS, ASN

As the edge node of the WIMAX access network, the GW device connects its corresponding SPs connected to other ASN GW devices and BSs in the WIMAX access network, and is connected to BNG or BRAS devices in the DSL access network.

[18] 18. The multi-service multi-edge system according to claim 17, wherein

The SP connected to the BNG or BRAS device passes BNG or BRAS to ASN

The GW to BS path provides services to the WIMAX access network; the ASN

The SP connected to the GW device provides the service to the WIMAX access network through the path of the ASN GW to the BS; the SP connected to the BNG or BRAS device provides the service to the DSL access network through the path of the BNG or BRAS to the AN; the ASN GW device Connected SP through ASN

The path from GW to BNG or BRAS to AN provides services to the DSL access network.

[19] 19. The multi-service multi-edge system according to claim 13, wherein the multi-service multi-edge system comprises: a first access network unit based on optical fiber technology and a second access based on optical fiber technology Network unit,

First access network unit based on fiber technology: including first central station equipment, ODN and fiber-based The AN in the access network of the technology, the first central station device acts as the IP edge node of the first access network based on the optical fiber technology, and connects its corresponding SP that is not connected to other central station devices and the first connection based on the optical fiber technology. The ODN in the network is connected to the second central station device in the second access network based on the optical fiber technology;

A second access network unit based on optical fiber technology: an AN in a second central station device, an ODN, and an optical fiber-based access network, and a second central station device as an IP edge node of a second access network based on optical fiber technology And connecting the corresponding SPs connected to other central station devices and the ODNs in the second access network based on the optical fiber technology, and the first central station devices in the first access network based on the optical fiber technology.

[20] 20. The multi-service multi-edge system according to claim 19, wherein

The SP connected to the first central station device passes through the first central station to the second central station to the BS or AP or the R emote

The DSLAM or ONU or ONT path provides services to the second access network based on the fiber technology; the SP connected to the second central station device passes the second central station to the BS or AP or Remote

The path of the DSLAM or the ONU or the ONT provides the service to the second access network based on the optical fiber technology; the SP connected by the first central station device passes the first central station to the BS or the AP or the Remote

The path of the DSLAM or the ONU or the ONT provides the service to the first access network based on the optical fiber technology; the SP connected by the second central station device passes the second central station to the first central station to the BS or AP or the Remote DSLAM or ONU Or the path of the ONT provides services to the first access network based on fiber technology.

[21] 21. The multi-service multi-edge system according to claim 13, wherein the multi-service multi-edge system comprises: a first DSL access network unit and a second DSL access network unit, the first DSL The access network unit includes: a first BNG or BRAS device and an AN, BNG or BRAS1 device as an IP edge node of the first DSL access network, connected to its corresponding SP that is not connected to other BNG or BR AS devices, Connecting to a second BNG or BRAS device in the second DSL access network;

The second DSL access network unit includes: a second BNG or BRAS device and an AN, and the second BNG or BR AS device serves as an IP edge node of the second DSL access network, and the corresponding connection is not connected to other BNG or BRAS devices. SP, peer, and first BNG or BRAS device in the first DSL access network Connected.

22. The multi-service multi-edge system of claim 21, wherein

The SP connected to the first BNG or BRAS device provides traffic to the second DSL access network through the path of the first BNG or BRAS to the second BNG or B RAS to the AN; the SP connected by the second BNG or BRAS device passes The path of the second BNG or BRAS to the AN provides the service to the second DSL access network; the SP connected by the first BNG or BRAS device provides the service to the first DSL access network through the path of the first BNG or BRAS to the AN; The SP connected by the second BNG or BRAS device provides traffic to the first DSL access network through the path of the second B NG or BRAS to the first BNG or BRAS to the AN.