WO2008067767A1

WO2008067767A1 - A communication method among network nodes, access service network and wimax network frame

Info

Publication number: WO2008067767A1
Application number: PCT/CN2007/071179
Authority: WO
Inventors: Xiuyi Li
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-12-05
Filing date: 2007-12-05
Publication date: 2008-06-12
Also published as: CN100531139C; CN1996950A

Abstract

A communication method among network nodes based on WiMAX network frame is disclosed, the said WiMAX network frame comprises connectivity service network CSN and access service network ASN; the private address is taken to perform communication among the network nodes, the said communication method comprises the following steps: distributing private address space for each ASN under same CSN, setting IP packet redirection unit in ASN; the said IP packet redirection unit confirms the located private address space of the destination address of the IP packet, and performs the forwarding process for the IP packet according to the confirmed result. An access service network and WiMAX network frame are also provided in the embodiment of the present invention.

Description

Communication method between network nodes, access service network and WiMAX network architecture The application is submitted to the Chinese Patent Office on December 5, 2006, the application number is 200610161902.9, and the invention name is "communication method between network nodes, access Priority of Chinese Patent Application for Service Network and WiMAX Network Architecture, the entire contents of which are incorporated herein by reference.

Technical field

The present invention relates to WiMAX network technology, and more particularly to a communication method between network nodes based on a WiMAX network architecture, an access service network, and a WiMAX network architecture.

Background technique

WiMAX ( Worldwide Interoperability Microwave Access, 3⁄4 Wave Access Global Interoperability) is a wireless metropolitan area network (WMAN) technology that provides a new air interface standard for the microwave and millimeter wave bands. WiMAX is an emerging wireless communication technology for transmitting wireless signals. It provides a high-speed connection to the Internet. With this technology, users can communicate data at a very fast speed within a range of 50 kilometers.

The Network Working Group (NGG), the working group that develops the WiMAX network specification, is currently the most active and most concerned working group. The working content of this working group is mainly concentrated on the IEEE802.16 standard and the core network. The development of network elements, functional entities, messages and protocols, with a clear definition and description of the parts of the existing standards that are not defined and involved. The objectives of the working group are: to establish an end-to-end network reference model to meet the needs of the WiMAX Forum Operators Working Group; to develop end-to-end network specifications, to define functional entities and network interfaces in the network; to establish interoperability for WiMAX systems basis.

The network working group divides the network specification into three phases. The second phase focuses on the definition of the network architecture reference model, the description of the reference point, the definition of the network function, and the description of the protocol and process.

The current WiMAX network reference model is shown in Figure 1. The WiMAX network includes SS ( Subscribe

Station, subscriber station)/MS (Mobile Subscribe Station), ASN (Access Service Network), and CSN (Connected Service Network), where MS passes Rl ( Reference Point 1 , airborne The interface reference point 1) is connected to the ASN, and the ASN is connected to the other ASN through the R4 interface, and the ASN and the CSN are connected through the R3 interface. The interface between the MS and the CSN is the logical interface R2. The R1 interface and the R3 interface are used as the actual physical bearers. The ASN is used to provide wireless access control, and the CSN is used to provide IP (Internet Protocol) connection management.

When the mobile station is in a roaming scenario, for the WiMAX mobile station, the visited network service provider (Visited Network Service Provider, Visited NSP or V-NSP) and the Home Network Service Provider (Home Network Service Provider, Home) are respectively accessed through the logical interface R2. NSP or H-NSP) communication, between the Visited NSP and the Home NSP through the R5 interface. The network provides roaming services for users, and users can still enjoy WiMAX services after moving to a different location.

Figure 2 is a schematic diagram of networking of an access service network. As shown in Figure 2, the access service network includes a BS (Base Station) and an ASN-GW (ASN-Gateway), where the interfaces between the BSs are R8 interfaces, BS and ASN-GW. The interface between the interfaces is an R6 interface, and the ASN-GW can be a TGW (Target Gateway), an SGW (Service Gateway), and an AGW (Anchor Gateway). The interface between the ASNs and the GWs is On the R4 interface, the interface between the ASN-GW and the CSN is an R3 interface.

In the network model shown in Figure 1, MIP (Mobile Internet Protocol) is used to implement terminal mobility management across ASNs. Depending on the implementation, the WiMAX Forum defines two optional MIP schemes: One is CMIP (Client Mobile IP, Client Mode Mobile IP), and the other is PMIP (Proxy Mobile IP, Proxy Mode Mobile IP).

In the CMIP solution, the MIP client is located in the MS and performs the functions of the complete MIP client. The MS needs to be fully aware of the MIP's process details, including MIP registration and registration refresh.

At present, the data transmission channel from CSN to MS in PMIP mode is shown in Figure 3. In Figure 3, the care-of address registered by the PMIP client in the HA (Home Agent, Home Agent) is CoA (Core of Address), which is the address of FA (Foreign Agent), the hometown of MS. The address is PoA (Point of Attachment), which is the address obtained by the MS through DHCP (Dynamic Host Configuration Protocol) or other means. The DP Fn provides the R6 interface data channel function, the 802.16e CS indicates the convergence sublayer of the 802.16e protocol, the L2 indicates the layer 2, the Payload indicates the load, the MIP tunnel indicates the MIP tunnel, the tunnel ID indicates the tunnel identifier, and the Intra-ASN Data Path indicates ASN internal data channel. In the PMIP scheme, the client is located at the ASN, which represents the MS to perform R3 mobility management. All MIP control is done on the network side. The process is transparent to the MS. The MS obtains its own IP address from the network through DHCP and communicates with the network through the obtained IP address. The ASN replaces the MS to complete the MIP registration and data transfer process. The MS needs to obtain the service IP address through DHCP, that is, the Ho A (MS Home Address), and the MS does not have an IP address. Therefore, the Pre-provisioned service flow between the MS and the ASN cannot be established. The WiMAX network needs to establish a temporary service flow to carry data for completing the DHCP process interaction. After the DHCP process ends, the temporary service flow is deleted, or the temporary service flow is modified into a Pre-provisioned service flow. In practical applications, the work of establishing, deleting, and tampering with temporary service flows is complicated, which will prolong the time of service establishment.

To this end, those skilled in the art have improved the existing ASN by adding a mobile terminal IP address proxy unit in the ASN, for assigning a private address (ie, PoA) to the MS in the ASN, and proxying the MS to obtain a The service IP address (that is, the HoA) forwards the IP packets sent and received by the MS by performing the conversion between the private address and the service IP address. The WiMAX network architecture constructed by the improved ASN is shown in FIG. 4. The WiMAX network architecture includes an ASN 401, an MS 402, and a CSN 403. The ASN 401 includes an MS IP Proxy 4011, an 802.16e Function 4012, an R6 DP Fn 4013, and a FA. 4014 and MIP Client 4015, the MS IP Proxy 4011 is used to perform the conversion between the private address and the service IP address of the MS 402, and delivers the IP packet sent and received by the MS 402. The MS IP Proxy 4011 is a mobile terminal IP address proxy unit. The private address is the address used by the MS 402 to communicate with the ASN 401, the service IP address is the address obtained by the MS IP Proxy 4011 proxy MS 402, and the R6 DP Fn 4013 is the R6 interface data channel functional unit. The CSN 403 includes HA 4031, DHCP Server 4032, and AAA 4033.

In the process of implementing the present invention, the inventors have found through research that: in the WiMAX network architecture shown in FIG. 4, the MS IP Proxy 4011, 802.16e Function 4012, R6 DP Fn 4013, FA 4014, and MIP Client 4015 in the ASN 401 The IP address of the service can be identified. In addition, the MS IP Proxy 4011, 802.16e Function 4012, and R6 DP Fn 4013 in the ASN 401 can also identify the private address of the MS 402 and the MS that interworks with the MS 402, if the MS 402 sends out The IP address of the IP packet is the service IP address of the MS 402 that receives the IP packet, or the source IP address of the IP packet received by the MS 402 is the service IP address of the MS that sends the IP packet. The 4011 can forward the IP packet sent and received by the MS 402 by performing the conversion between the private address of the MS 402 and the service IP address. However, if the MS 402 only obtains the private address of the MS that exchanges the IP packet with the MS 402, the address of the MS in the IP packet can only be the private address of the MS. The private address of the MS is valid inside the ASN where the MS is located. The IP address of the MS IP Proxy 4011 cannot be forwarded because it cannot identify the private address of the MS. This affects the normal communication between the MSs.

Summary of the invention

Embodiments of the present invention provide a communication method between a network node based on a WiMAX network architecture, an access service network, and a WiMAX network architecture, which can implement normal communication between network nodes.

Embodiments of the present invention provide a communication method between network nodes based on a WiMAX network architecture, where the WiMAX network architecture includes a connection service network CSN and an access service network ASN, and the network nodes communicate using a private address, where the communication is performed. The method includes: allocating a private address space for each ASN in the same CSN, and setting an IP packet redirection unit in the ASN; the IP packet redirection unit determining a private address space where the destination address of the IP packet is located, according to The determined result is forwarded by IP >3⁄4 text.

An embodiment of the present invention further provides an access service network, including an R6 interface data channel function unit and a mobile terminal IP address proxy unit, including: an IP address redirection unit, configured on the R6 interface data channel function unit and the mobile terminal IP. The address proxy unit is configured to determine a private address space where the destination address of the IP packet is located according to a private address space allocated for each ASN in the same CSN, and the IP address according to the private address space where the determined destination address is located ^艮文For forwarding processing.

The embodiment of the present invention further provides a WiMAX network architecture, including a network node, an ASN, and a CSN, where the ASN further includes an IP redirection unit, configured to determine, according to a private address space allocated for each ASN in the same CSN in advance. The private address space where the destination address of the IP packet resides is forwarded based on the private address space where the destination address is determined.

The embodiment of the present invention further provides an IP packet redirection unit, which is disposed between the R6 interface data channel function unit and the mobile terminal IP address proxy unit, and is configured to allocate a private address according to each ASN in the same CSN in advance. The space is determined by the private address space where the destination address of the IP packet is located, and the IP address is forwarded according to the private address space where the destination address is determined.

Therefore, in the embodiment of the present invention, each ASN under the same CSN may be allocated a private place. The address space, in this way, the IP packet redirection unit set in the ASN can determine the ASN of the destination network node of the IP packet by using the IP address of the IP packet for the IP packet sent by the corresponding network node. Forward IP packets to achieve normal communication between network nodes.

In addition, in the embodiment of the present invention, the IP packets exchanged between the network nodes of different ASNs in the same CSN can be transmitted between the IP packet redirection units, and need not be transmitted through the CSN, as compared with the prior art. The IP packets exchanged between the network nodes of the same CSN need to be transmitted through the CSN. The embodiment of the present invention can obviously reduce the load of the CSN, and can save the transmission time of the IP address.

DRAWINGS

1 is a prior art WiMAX network reference model diagram;

2 is a schematic diagram of networking of an access service network in the prior art;

3 is a schematic diagram of a data transmission path from a CSN to an MS in a PMIP mode in the prior art; FIG. 4 is a schematic diagram of a WiMAX network architecture constructed using an improved ASN in the prior art; FIG. 5A is a first embodiment of the method of the present invention; Flow chart

Figure 5B is a flow chart of a second embodiment of the method of the present invention;

6 is a schematic diagram of a data channel and a CSN forwarding message between IP element redirection units according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an ASN according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of networking of a WiMAX network architecture according to an embodiment of the present invention.

detailed description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode for carrying out the invention will be described in detail with reference to the accompanying drawings. It should be noted that the meanings of the terms, words and claims used in the embodiments of the present invention are not limited to their literal and ordinary meanings, but also include meanings and concepts consistent with the techniques of the present invention. Because we as inventors, we should give the definition of terms appropriately so as to best describe our invention. Therefore, the configurations given in the following description and the drawings are merely preferred embodiments of the present invention, and not all of the technical features of the embodiments of the present invention. We need to recognize that there are a variety of equivalent or modified solutions that can replace our solutions.

First, a first embodiment of the method of the present invention will be described with reference to FIG. 5A. The first embodiment of the method of the present invention is based on a WiMAX network architecture, and the WiMAX network architecture includes a CSN and an ASN. The network node uses a private address to communicate with each other. The network node can be a node such as a mobile terminal or a server. As shown in FIG. 5A, the first embodiment of the method includes the following steps:

Step S501A: Allocating a private address space for each ASN in the same CSN, and setting an IP packet redirection unit in the ASN.

After a private address space is allocated for each ASN, the private addresses of the network nodes in the same ASN belong to the same private address space. In addition, a CSN can provide services for multiple ASNs. After each private address space is allocated to each ASN, the private address of the MS can be used to determine which ASN the MS is in. The private address space of each ASN is different from each other. In addition, when a private address space is allocated for each ASN, the mapping relationship between the private address space allocated to other ASNs and these ASNs can be stored in each ASN, so that each ASN knows each address storage space. Which ASN corresponds to each.

The IP packet redirection unit can be used to forward IP packets. In particular, IP packets exchanged between network nodes in different ASNs of the same CSN can be forwarded through the data channel between the IP packet redirection units.

Step S502A: The IP packet redirection unit determines a private address space where the destination address of the IP packet is located, and forwards the IP packet according to the determined result.

The IP 4 packet redirection unit is set in the ASN, so if the IP packet sent by the corresponding network node is received and the destination address of the IP packet and the private address of the network node that sends the IP packet belong to the private address of an ASN. The IP address, that is, the network node corresponding to the destination address and the network node that sends the IP packet are in the same ASN, the IP address can be identified by the IP redirection unit. Therefore, the IP packet redirection unit only needs to be IP. The packet is forwarded to the network node corresponding to the destination address. It should be noted that each ASN provides service for at least one network node, and in the embodiment of the present invention, a network node that receives service provided by each functional unit in the ASN and the ASN is referred to as a network node corresponding to the ASN or an ASN. The network node corresponding to each functional unit.

In step S501A, the mapping relationship between the private address spaces of other ASNs and the ASNs may be stored in each ASN, respectively, while the private address space is allocated. In addition, the IP packet redirection unit can obtain the private address space of other ASNs in multiple ways. For example, the private address of the ASN can be requested from other ASNs through the data channel or CSN between the IP packet redirection units. Space, you can also directly request the CSN to provide the private address space of the ASN. The private address of the network node of the IP packet does not belong to the private address space of the same ASN. That is, the network node corresponding to the destination address is not in the same ASN as the network node that sends the IP address, and the IP 4 packet redirection unit will The IP packet is forwarded to the network node corresponding to the destination address through the data channel between the other IP packet redirection units. Of course, the IP address of the mobile terminal, the FA, the CSN, the FA corresponding to the destination address, and the IP address proxy unit of the mobile terminal corresponding to the destination address may be forwarded to the IP address corresponding to the destination address. Then, the IP address is redirected by the IP address corresponding to the destination address to the network node corresponding to the destination address.

After the IP packet redirection unit determines the private address space where the destination address is located, it can also establish a mapping between the IP address and the ASN corresponding to the private address space where the destination address is located in the forwarding table set by the IP packet in the ASN. relationship. The mapping relationship may be SFID => (ASN ID, R4 Tunnel), where SFID is the identifier of the IP packet, the ASN ID is the identifier of the ASN corresponding to the destination address of the IP packet, and the R4 Tunnel indicates the between the IP packet redirection units. Data channel. If the ASN ID is the same as the ASN corresponding to the network node that sends the IP packet, the value of the R4 tunnel is set to any value. Otherwise, the value of the R4 tunnel is set to indicate that the IP packet is redirected. The value of the data channel.

If the IP packet redirection unit receives the same type of IP packet from the same network node, the IP packet can be IP based on the mapping between the IP packet and the ASN corresponding to the private address space where the destination address resides. The packet is forwarded. The same network node is the network node that has sent the same type of IP packet to the IP packet redirection unit. The mapping relationship is the IP packet identifier and IP packet destination address. Correspondence between the corresponding ASN identifiers. The processing may be implemented by determining the identifier of the ASN corresponding to the IP packet, where the identifier of the ASN is the identifier of the ASN corresponding to the private address space where the destination address is located, and if the identifier of the corresponding ASN is determined and the IP address is sent. If the ASN of the network node is the same, the IP address is forwarded to the network node corresponding to the destination address. Otherwise, the IP packet is forwarded to the network node corresponding to the destination address through the data channel between the other IP packet redirection units. . It should be noted that, in the foregoing embodiment, an IP packet redirection unit is separately configured in the ASN to implement IP packet forwarding. In practical applications, the IP address and the mobile terminal IP address can be completely used. The agent units are integrated, and the functionality of the IP · Redirection unit is implemented by the integrated entity. In the foregoing embodiment, before forwarding a packet, the private address space of all ASNs in the same CSN needs to be planned. When forwarding, the IP packet redirection unit determines the destination address by determining the private address space where the destination address is located. In which ASN the network node is in the actual application, the IP packet redirection unit can also forward the IP packet by processing the mapping between the private address of the network node and the corresponding ASN.

A second embodiment of the method of the present invention will now be described with reference to Figure 5B.

Step S501B: An IP packet redirection unit is set between the MS and the mobile terminal IP address proxy unit in the ASN.

Specifically, the IP packet redirection unit may be disposed between the R6 interface data channel function unit in the ASN and the mobile terminal IP address proxy unit. The set IP address redirection unit can be used to obtain and forward IP packets exchanged between the MS and the MS in the same CSN. The private address can be PoA. The mobile terminal IP address proxy unit is used to convert the PoA and HoA of the MS in the IP packet. In addition, the IP packet redirection unit may have a data channel that communicates with the IP packet redirection unit in other ASNs, and this data channel can forward IP4 and other data.

Step S502B: The IP file redirection unit acquires a mapping relationship between a private address of all or a specific MS under the same CSN and a corresponding ASN.

For the MS in the same ASN, the IP packet redirection unit can identify the network node according to the pre-stored private address of the MS in the same ASN, or the private address of all MSs in the same ASN from the ASN. The private entity of the MS is obtained from the functional entity. Of course, these private addresses can also be obtained from the CSN.

There are several ways for the IP packet redirection unit to obtain the required mapping relationship for the MSs in different ASNs. The following describes several possible acquisition methods.

The IP packet redirection unit may have a data channel, and the IP packet redirection unit may request the other ASNs through the data channel to provide a mapping relationship between the private addresses of all or specific MSs under the ASNs and the ASNs. The IP packet redirection unit of the ASN can also return the mapping relationship to the IP packet redirection unit through the data channel between the IP packet redirection units. For example, a CSN provides services for ASN1, ASN2, and ASN3. If the IP address in ASN1 or ASN1 is redirected, the redirection unit needs to obtain the private address of all or a specific MS under ASN2 and ASN2. The mapping between the IP packet redirection unit in ASN1 and the IP packet redirection unit in ASN2 sends an ASN2 to the IP packet redirection unit in ASN2.

The IP packet redirection unit returns the required mapping relationship to the IP packet redirection unit in ASN1 through the data channel between the IP packet redirection unit and the ASN1. The IP packet redirection in the ASN1. The data channel between the unit and the IP packet redirection unit in ASN2 can be one channel, that is, the transmission of uplink and downlink data shares one channel; or two channels, that is, the uplink and downlink data are respectively transmitted using the uplink channel and the downlink. aisle. The process in which the IP packet redirection unit in ASN1 obtains the mapping relationship between all or a specific MS and ASN3 under ASN3 is the same as the process of obtaining the mapping relationship between all or a specific MS and ASN2 under ASN2. In addition, if there is a data channel 1 between the IP address of the ASN1 and the IP packet redirection unit of the ASN2, the IP packet redirection unit of the ASN2 and the IP packet redirection unit of the ASN3 Data channel 2, but there is no data channel between the IP packet redirection unit of ASN1 and the IP packet redirection unit of ASN3, and between the IP packet redirection unit of ASN1 and the IP packet redirection unit of ASN3. All data can be passed through Data Channel 1 and Data Channel 2, respectively. The ASN is required to provide the required mapping relationship, and the ASNs can then return the required mapping relationship to the IP address forwarding unit through the CSN, the FA, and the mobile terminal IP address proxy unit. The ASNs can also pass the IP packet. Redirects the data channel between the units, and returns the required mapping relationship to the IP address. Similarly, the IP · 艮重定向 redirect unit can provide the required mapping relationship to other ASN requests through the data channel between the IP 艮重定向 redirect unit, and these ASNs can sequentially pass the CSN, FA and mobile terminal IP addresses. The proxy unit returns the required mapping relationship to the IP document redirection unit.

The CSN can provide services for multiple ASNs at the same time. Therefore, the CSN can store the mapping relationship between the MSs of all ASNs and the corresponding ASNs. Therefore, the IP redirection unit can sequentially pass the mobile terminal IP address proxy unit and the FA direction. The CSN requests to provide the required mapping relationship, and the CSN sequentially returns the required mapping relationship to the IP address redirection unit through the FA and the mobile terminal IP address proxy unit. If the CSN does not store the required mapping relationship, the ASN may be queried for the required mapping relationship or required to report the required mapping relationship. In addition, the IP packet redirection unit does not have to actively request the required mapping relationship, each

After each access to a new MS, the ASN can send the mapping between the private address of the new MS and the corresponding ASN to the IP packet redirection unit through the data channel between the CSN or IP packet redirecting unit. In this way, the IP packet redirection unit can also obtain the mapping relationship between the private addresses of all MSs in each ASN and the corresponding ASN.

It should be noted that the mapping relationship obtained by the IP packet redirection unit may include the private address of the MS and the identifier and/or address of the ASN, or the mapping relationship may be determined before the IP packet redirection unit is reached. The mapping relationship obtained by the IP packet redirection unit may also include only the private address of the MS. As long as the IP packet redirection unit knows which ASN the private address is provided by, the mapping relationship including the private address is reached. You can also establish the mapping between the private address of the MS and the corresponding ASN.

After obtaining the required mapping relationship, the IP packet redirection unit can store it in a forwarding table. The forwarding table can be set in the IP packet redirection unit or separated from the IP packet redirection unit. Set in the ASN.

Step S503B: The IP packet exchanged between the MS and the MS in the same CSN is forwarded by the IP packet redirection unit.

The IP packet redirection unit can resolve the private address of the target MS in the IP packet, therefore, the IP packet redirection unit has obtained or has the capability to obtain the mapping between the private address of the MS and the corresponding ASN. Therefore, the IP address is · The 重定向重定向 redirect unit can forward IP 4 艮 text.

When the IP packet sent by the MS reaches the IP packet redirection unit, the IP packet redirection unit first resolves the destination address of the IP packet. The destination address is assumed to be the private address of the MS. The IP packet redirection unit can resolve the destination address of the IP packet in the manner of the destination address, that is, the mapping between the destination address and the corresponding ASN in the forwarding table, and if the mapping relationship is queried, the destination address is determined. ASN, otherwise, to the corresponding CSN, or through the data channel between the IP packet redirection unit or the corresponding CSN to the other ASN, request the mapping relationship between the destination address and the corresponding ASN, and then store the mapping relationship to the switch. Published.

If the destination address is the private address of the MS under the same ASN, the IP address is forwarded to the target MS.

If the destination address is the private address of the MS under different ASNs under the same CSN, the IP will be The packet is forwarded to the IP packet redirection unit corresponding to the target MS through the data channel between the IP packet redirection unit, and the IP address is forwarded by the target MS to the target MS.

The FA and the CSN are sent to the IP redirection unit corresponding to the target MS, and the IP packet redirection unit corresponding to the target MS forwards the IP packet to the target MS. However, the method of forwarding packets through the CSN will increase the load of the CSN and prolong the time of packet forwarding, as opposed to forwarding packets through the IP channel. Therefore, the method of forwarding packets through the data channel between the IP packet redirection units reduces the load on the CSN and shortens the packet forwarding time. The schematic diagram of the data channel and the CSN forwarding packet between the IP packet redirection unit is shown in FIG. 6. The 802.16e Function provides the function specified by the 802.16e protocol, and the R6 DP Fn provides the R6 interface data channel function. The Redirector is an IP packet redirection unit, and the MS IP Proxy is a mobile terminal IP address proxy unit. The dotted line indicates the process of forwarding IP packets through the R4 tunnel, and the solid line indicates the process of forwarding IP packets through the CSN. By forwarding the data channel between the Packet Redirectors, it is no longer necessary to pass the MS IP Proxy and the HA in the CSN, so the load of the HA can be alleviated and the IP forwarding speed can be accelerated.

It should be noted that the mapping between the private address of the MS and the corresponding ASN may be as follows:

(SFID, D-PoA) => (ASN ID, R4 Tunnel),

The SFID indicates the identifier of the IP packet, and the D-PoA indicates the private address of the target MS. The ASN ID indicates the identifier of the ASN corresponding to the target MS, and the R4 Tunnel indicates the data channel between the IP packet redirection units.

After receiving the IP packet sent by the MS, if the ASN ID corresponding to the D-PoA is the ID of the ASN, the IP packet redirection unit sends the IP address to the target MS. If the D-PoA is found, If the ASN ID is the ID of a different ASN under the same CSN, the IP address is forwarded to the IP address of the ASN ID through the R4 tunnel. If the ASN ID corresponding to the D-PoA is different, the CSN is different. The ID of the ASN is sent to the CSN through the mobile terminal IP address proxy unit and the FA in turn. In addition, if the destination address of the IP packet is the PoA of the MS in the ASN, since the PoA is valid in the ASN, the IP 4 packet redirection unit can directly identify the address, so the forwarding table can be omitted. In the mapping relationship, the IP packet is directly forwarded to the target MS. The foregoing steps S502 and S503 only describe the processing mode of the interworking IP packets between the MS and the MS in the same CSN. In practical applications, the MS may also communicate with the MSs under different CSNs, and the following is for the MS and the different CSNs. The MS interworking IP text processing method is explained.

In step S502B, the IP file redirection unit further acquires a mapping relationship between the private addresses of all or specific MSs and the corresponding ASNs in different CSNs.

The IP file redirection unit can request the required mapping relationship from the CSN, and the CSN returns the required mapping relationship to the IP packet redirection unit.

In step S503B, the interworking IP address between the MS and the MSs in different CSNs is forwarded via the IP "Redirection Unit" and the CSN.

The IP packet redirection unit corresponding to the MS can resolve the destination address of the IP packet, and the destination address is the private address of the target MS. The IP address of the IP address can be used to resolve the destination address of the IP address, that is, the mapping between the destination address and the corresponding ASN in the forwarding table. If the mapping is found, the destination address is determined. Corresponding ASN, otherwise, the mapping relationship between the destination address and the corresponding ASN is requested to the corresponding CSN, and the mapping relationship is stored in the forwarding table.

If the destination address is the private address of the target MS under different CSNs, the IP address is forwarded to the CSN corresponding to the MS through the mobile terminal IP address proxy unit and the FA. If the target MS is a node such as a server that does not serve the ASN, the CSN corresponding to the MS forwards the IP packet to the target MS. If the target MS accepts the service provided by the ASN, the CSN corresponding to the MS forwards the IP packet to the The CSN corresponding to the target MS, the CSN corresponding to the target MS forwards the IP packet to the IP corresponding to the target MS through the FA corresponding to the target MS and the IP address proxy unit of the mobile terminal, and finally corresponds to the target MS. The IP ^ 重定向 redirection unit forwards the IP ^ 艮 text to the target MS.

Embodiments of the present invention also provide an improved ASN.

Figure 7 is a schematic illustration of the structure of such an improved ASN. As shown in FIG. 7, the ASN701 includes an MS IP Proxy 7011, an 802.16e Function 7012, an R6 DP Fn 7013, a FA 7014, a MIP Client 7015, and a Packet Redirector 7016, wherein the R6 DP Fn 7013 is connected to the 802.16e Function 7012, and the FA 7014 is respectively It is connected to the MS IP Proxy 7011 and the MIP Client 7015. The Packet Redirector 7016 is an IP packet redirection unit. It is set between the R6 DP Fn 7013 and the MS IP Proxy 7011 and is used according to each ASN 701 in the same CSN. The assigned private address is empty The private address space where the destination address of the IP packet sent by the corresponding network node is located is determined, and the IP address is forwarded according to the private address space where the determined destination address is located. The private address space of each ASN 701 is uniformly planned when the WiMAX network architecture is constructed. The private address of the network node under the same ASN 701 belongs to a private address space. In addition, one CSN can serve multiple ASNs 701. After each ASN 701 allocates a private address space, it can determine which ASN 701 the target network node is in by the private address of the target network node. The private address space of each ASN 701 is different from each other. In addition, when a private address space is allocated for each ASN 701, the mapping relationship between the private address space allocated to other ASNs 701 and these ASNs 701 can be stored in each ASN 701, so that each ASN 701 knows Which ASN 701 corresponds to each address storage space.

The Packet Redirector 7016 can be used to forward IP packets. In particular, IP packets exchanged between network nodes under different ASNs 701 in the same CSN can be forwarded through the data channel between Packet Redirector 7016.

Since the Packet Redirector 7016 is set in the ASN 701, if the IP packet sent by the corresponding network node is received, and the destination address of the IP packet and the private address of the network node that sends the IP packet belong to the private address space of the ASN 701. If the network node corresponding to the destination address is in the same ASN 701 as the network node that sends the IP packet, the Packet Redirector 7016 can completely identify the destination address. Therefore, the Packet Redirector 7016 only forwards the IP packet to the destination address. The network node is OK.

In addition, the Packet Redirector 7016 can obtain the private address space of other ASNs 701 in multiple ways. For example, the ASN 701 can be requested to provide the private address space of the ASNs 701 through the data channel or CSN between the Packet Redirector 7016. It is also possible to request the CSN to provide the private address space of the ASN 701, so that if the IP packet sent by the corresponding network node is received, and the IP address of the IP address is not the private address of the network node that issued the IP address, The private address space belonging to the same ASN701, that is, the network node corresponding to the destination address is not in the same ASN 701 as the network node that sends the IP address, and the Packet Redirector 7016 passes the IP packet to the data between the other Packet Redirector 7016. The channel is forwarded to the network node corresponding to the destination address. Of course, the IP packet can be forwarded to the packet corresponding to the destination address through the MS IP Proxy 7011, the FA 7014, the CSN, the FA 7014 corresponding to the destination address, and the MS IP Proxy 7011 corresponding to the destination address. The Redirector 7016 forwards the IP packet to the network node corresponding to the destination address by the Packet Redirector 7016 corresponding to the destination address.

The Packet Redirector 7016 may include: a destination address unit for parsing a private address space in which the destination address of the IP packet is located; and an IP packet forwarding unit, configured to directly forward the IP packet to the destination address according to the result of the resolution of the destination address. The corresponding network node is forwarded to the network node corresponding to the destination address through a data channel with other IP packet redirection units.

The Packet Redirector 7016 may further include a mapping and relationship unit, configured to determine a private address in which the destination address is located, and establish an IP address for the IP packet in the forwarding table set in the ASN 701. The mapping relationship between the ASNs 701 corresponding to the space. The mapping relationship may be SFID => (ASN ID, R4 Tunnel), where SFID is the identifier of the IP packet, the ASN ID is the identifier of the ASN 701 corresponding to the destination address of the IP packet, and the R4 Tunnel is the data between the Packet Redirector 7016. aisle. If the ASN ID is the same as the ASN 701 corresponding to the network node that sends the IP packet, the value of the R4 Tunnel is set to any value. Otherwise, the value of the R4 Tunnel is set to indicate the data channel between the Packet Redirector 7016. Value.

If the destination IP address is determined to be the IP packet of the same type that is sent by the same corresponding network node, the IP packet forwarding unit can be based on the IP packet and the destination address that have been forwarded. The mapping between the ASNs 701 corresponding to the private address space, and the received IP packets are forwarded. The same network node has sent the same type of IP packets to the IP packet redirection unit. The mapping relationship between the IP address of the IP packet and the identifier of the ASN corresponding to the IP address of the IP address. The processing may be implemented by determining the identifier of the ASN 701 corresponding to the IP address, where the identifier of the ASN 701 is the identifier of the ASN 701 corresponding to the private address space where the destination address is located, and if the identifier of the corresponding ASN 701 is determined and issued. If the identifier of the ASN 701 corresponding to the network node of the IP packet is the same, the IP packet is forwarded to the network node corresponding to the destination address. Otherwise, the IP address is forwarded to the destination address through the data channel with other Packet Redirector 7016. Corresponding network node. It should be noted that, in the foregoing embodiment, a Packet Redirector 7016 is separately configured in the ASN 701 to implement IP packet forwarding. In practical applications, the Packet Redirector 7016 and the MS IP Proxy 7011 can be integrated together, and the Packet Redirector 7016 is integrated. The functionality is implemented by the integrated entity.

In the above embodiment, all ASNs 701 under the same CSN need to be forwarded before the packet is forwarded. The private address space is planned. When forwarding, the Packet Redirector 7016 determines which ASN 701 the destination node corresponds to by determining the private address space where the destination address is located. In the actual application, the packet redirector 7016 can also forward the IP packet by obtaining the mapping between the private address of the network node and the corresponding ASN 701. The method of forwarding an IP text by a mapping relationship is the same as the second embodiment of the method of the present invention.

Embodiments of the present invention also provide an improved WiMAX network architecture.

Figure 8 is a schematic diagram of the networking of the improved WiMAX network architecture. As shown in FIG. 8, the WiMAX network architecture includes at least one ASN 801, at least one MS 802, and one CSN 803. The ASN 801 includes an MS IP Proxy 8011, an 802.16e Function 8012, an R6 DP Fn 8013, a FA 8014, and a MIP Client 8015. And the Packet Redirector 8016, wherein the R6 DP Fn 8013 is connected to the 802.16e Function 8012, the FA 8014 is connected to the MS IP Proxy 8011 and the MIP Client 8015, and the Packet Redirector 8016 is an IP packet redirection unit, which is set in the R6 DP Fn 8013 and The IP address of the IP address of the IP address corresponding to the MS 802 is determined according to the private address space allocated to each ASN 801 in the same CSN 803, and is determined by the MS IP Proxy 8011. The private address space where the destination address is located forwards the IP address. The private address space of each ASN 801 is uniformly planned when the WiMAX network architecture is constructed. The private address of the MS 802 in the same ASN 801 belongs to a private address space. In addition, one CSN 803 can serve multiple ASNs 801. After each ASN 801 is assigned a private address space, it is thus possible to determine in which ASN 801 the target MS 802 is located by the private address of the target MS 802. The private address space of each ASN 801 is different from each other. In addition, when a private address space is allocated for each ASN 801, the mapping relationship between the private address space allocated to other ASNs 801 and these ASNs 801 can be stored in each ASN 801, so that each ASN 801 knows Which ASN 801 corresponds to each address storage space.

The Packet Redirector 8016 can be used to forward IP packets. In particular, the IP packets exchanged between the MSs 802 in different ASNs 801 under the same CSN 803 can be forwarded through the data channel between the Packet Redirector 8016.

The Packet Redirector 8016 is set in the ASN 801. If the IP address sent by the corresponding MS 802 is received, and the IP address of the IP packet is the same as the private address of the MS 802 that sends the IP packet, it belongs to the private address space of the ASN 801. , that is, the destination address corresponding to the MS 802 and issued If the MS 802 of the IP packet is in the same ASN 801, the Packet Redirector 8016 can identify the destination address. Therefore, the Packet Redirector 8016 can forward the IP packet to the MS 802 corresponding to the destination address.

In addition, the Packet Redirector 8016 can obtain the private address space of other ASNs 801 in multiple ways. For example, the ASN 801 can be requested to provide the private address space of these ASNs 801 through the data channel between the Packet Redirector 8016 or the CSN 803. The CSN 803 may be requested to provide the private address space of the ASN 801, so that if the IP packet sent by the corresponding MS 802 is received, and the destination address of the IP packet does not belong to the same ASN as the private address of the MS 802 that sends the IP packet. The private address space of the 801, that is, the MS 802 corresponding to the destination address and the MS 802 that sends the IP packet are not in the same ASN 801, and the Packet Redirector 8016 forwards the IP packet to the destination through the data channel between the other Packet Redirector 8016. The address corresponds to the MS 802. Of course, the IP packet can be forwarded to the Packet Redirector 8016 corresponding to the destination address by using the MS IP Proxy 8011, the FA 8014, the CSN 803, the FA 8014 corresponding to the destination address, and the MS IP Proxy 8011 corresponding to the destination address. The Packet Redirector 8016 forwards the IP packet to the MS 802 corresponding to the destination address.

The Packet Redirector 8016 may include: a destination address unit for parsing a private address space in which the destination address of the IP packet is located; and an IP packet forwarding unit, configured to directly forward the IP packet to the destination address according to the result of the resolution of the destination address. The corresponding network node is forwarded to the network node corresponding to the destination address through a data channel with other IP packet redirection units.

The packet redirector 8016 may further include a mapping and relationship unit, configured to determine a private address in which the destination address is located, and then establish an IP address for the IP packet in the forwarding table set in the ASN 801. The mapping relationship between the ASNs 801 corresponding to the space. The mapping relationship can be SFID => (ASN ID, R4 Tunnel), where SFID is the identifier of the IP packet, the ASN ID is the identifier of the ASN 801 corresponding to the destination address of the IP packet, and the R4 Tunnel is the data between the Packet Redirector 8016. aisle. If the ASN ID is the same as the ASN 801 corresponding to the MS 802 that sends the IP packet, the value of the R4 Tunnel is set to any value. Otherwise, the value of the R4 Tunnel is set to indicate the data channel between the Packet Redirector 8016. Value.

If the resolution destination address unit determines that the received IP packet is the same type of IP packet sent by the same corresponding MS 802 that has been forwarded, the forwarding IP packet unit may be forwarded according to the already forwarded IP packet. The IP packet is forwarded to the ASN 801 corresponding to the private address space where the destination address is located, and the received IP packet is forwarded. The same network node is redirected to the IP packet. A network node that has sent the same type of IP packet, and the mapping relationship is the mapping between the identifier of the IP packet and the identifier of the ASN corresponding to the destination address of the IP address. The processing may be implemented by determining the identifier of the ASN 801 corresponding to the IP address, where the identifier of the ASN 801 is the identifier of the ASN 801 corresponding to the private address space where the destination address is located, and if the identifier of the corresponding ASN 801 is determined and issued. If the identifier of the ASN 801 corresponding to the MS 802 of the IP packet is the same, the IP packet is forwarded to the MS 802 corresponding to the destination address. Otherwise, the IP address is forwarded to the destination address through the data channel between the other Packet Redirector 8016. Corresponding MS 802.

It should be noted that the foregoing embodiment separately sets a Packet Redirector in the ASN 801.

The 8016 implements the forwarding of IP packets. In actual applications, the Packet Redirector 8016 and the MS IP Proxy 8011 can be integrated. The functions of the Packet Redirector 8016 are implemented by the integrated entity.

In the foregoing embodiment, before forwarding the packet, the private address space of all ASNs 801 in the same CSN 803 needs to be planned. When forwarding, the Packet Redirector 8016 determines the destination address by determining the private address space where the destination address is located. In which ASN801 the MS 802 is used, in the actual application, the Packet Redirector 8016 can also forward the IP packet by processing the mapping between the private address of the MS 802 and the corresponding ASN 801. The method of forwarding the IP "" by the mapping relationship is the same as the second embodiment of the method of the present invention.

The IP address redirection unit may include: a parsing destination address unit, configured to parse a private address space where the IP address of the IP address is located; and forwarding an IP address unit, configured to parse the destination address according to the The destination address of the unit is directly forwarded to the network node corresponding to the destination address, or forwarded to the network node corresponding to the destination address through the data channel between the other IP packet redirection units. Further, the IP file redirection unit may further include: establishing and maintaining a mapping relationship unit, configured to determine the private address space where the destination address is located, and the IP address is in the ASN. The mapping between the IP address and the ASN corresponding to the private address space where the destination address is located is established in the forwarding table.

In an embodiment of the present invention, the IP packet redirection unit may obtain a mapping relationship between the private address of the target network node and the corresponding ASN, and if the IP 4 packet redirection unit knows which ASN the target network node corresponds to, The IP "^" is correctly forwarded to the ASN corresponding to the target network node, thereby achieving the purpose of normal communication between the network nodes.

In the embodiment of the present invention, the IP packet redirection unit can forward the IP packets exchanged between the network nodes of different ASNs in the same CSN through the data channel between the IP packet redirection units. The IP packet exchanged between the MSs in the technology is transmitted through the CSN. The embodiment of the present invention can obviously reduce the load of the CSN and shorten the forwarding time of the IP packet.

In the embodiment of the present invention, the IP packet redirection unit can forward the IP packets exchanged between the network node and the network node outside the WiMAX network architecture. Therefore, the embodiment of the present invention is also applicable to non-MS interworking. The case of IP packets.

In the embodiment of the present invention, the IP 4 重定向 redirection unit may sequentially forward the IP packets exchanged between the network nodes through the mobile terminal IP address proxy unit, the FA and the CSN, and therefore, the actual architecture of the present invention.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

Claims

Rights request

A communication method between network nodes based on a WiMAX network architecture, the WiMAX network architecture includes a connection service network CSN and an access service network ASN, and the network nodes use a private address for communication, and the method includes:

A private address space is allocated to each ASN in the same CSN, and an IP packet redirection unit is set in the ASN. The IP packet is forwarded according to the determined result.

The communication method between the network nodes based on the WiMAX network architecture according to claim 1, wherein the IP packet redirection unit forwards the IP packet according to the determined result according to the following process: Step implementation:

If the destination address is the same as the private address of the network node that sends the IP address, the IP packet is forwarded to the network node corresponding to the destination address; otherwise, the IP packet is redirected to other IP packets. The data channel between the units is forwarded to the network node corresponding to the destination address.

The communication method between the network nodes based on the WiMAX network architecture according to claim 1, wherein the IP file redirection unit further determines: after the private address space where the destination address of the IP document is located, The mapping between the IP packet and the ASN corresponding to the private address space where the destination address resides is set up in the forwarding table set in the ASN.

The communication method between the network nodes based on the WiMAX network architecture according to claim 3, wherein after the IP packet is forwarded, the method further comprises: if the IP packet redirection unit receives the same again An IP packet of the same type sent by a corresponding network node forwards the IP packet according to the mapping between the IP address and the ASN corresponding to the private address space where the destination address is located.

The communication method between the network nodes based on the WiMAX network architecture according to claim 4, wherein the IP packet is reported according to the mapping relationship between the IP packet and the ASN corresponding to the private address space where the destination address is located. The process of forwarding the text is implemented as follows:

Determining an identifier of the ASN corresponding to the IP address, where the identifier of the ASN is an identifier of the ASN corresponding to the private address space where the destination address is located;

If it is determined that the identifier of the corresponding ASN is the identifier of the same ASN, the IP is forwarded to The network node corresponding to the destination address; otherwise, the IP packet is forwarded to the network node corresponding to the destination address through the data channel between the other IP packet redirection units.

6. An access service network, comprising an R6 interface data channel function unit and a mobile terminal IP address proxy unit, wherein the method further comprises:

The IP packet redirection unit is disposed between the R6 interface data channel function unit and the mobile terminal IP address proxy unit, and is configured to determine the IP address according to the private address space allocated for each ASN in the same CSN in advance. The private address space where the destination address is located forwards the IP packet according to the private address space where the destination address is determined.

The access service network according to claim 6, wherein the IP packet redirection unit comprises:

The destination address unit is configured to parse the private address space of the destination address of the IP address, and the forwarding IP packet unit is configured to directly forward the IP packet to the destination address of the destination address unit. The network node corresponding to the destination address is forwarded to the network node corresponding to the destination address through the data channel between the other IP packet redirection units.

The access service network according to claim 6, wherein the IP packet redirection unit further comprises:

Establish and maintain a mapping relationship unit, which is used to determine the mapping between the ASNs corresponding to the private address space where the destination address resides in the forwarding table set in the ASN for the IP address in the private address space where the destination address is located. relationship.

The access service network according to claim 8, wherein: the parsing destination address unit determines that the received IP packet is the same type of IP packet sent by the same corresponding network node that has been forwarded. The forwarding IP packet unit forwards the received IP packet according to the mapping relationship between the forwarded IP packet and the ASN corresponding to the private address space where the destination address is located.

10. A WiMAX network architecture, including a network node, an ASN, and a CSN, wherein: the ASN further includes an IP redirection unit, configured to determine, according to a private address space allocated for each ASN in the same CSN in advance. The private address space where the destination address of the IP packet resides is forwarded based on the private address space where the destination address is determined.

11. An IP packet redirection unit, characterized by: setting a data channel function on an R6 interface Between the unit and the mobile terminal IP address proxy unit, for each of the same CSN

The private address space allocated by the ASN determines the private address space where the destination address of the IP packet is located, and forwards the IP packet according to the private address space where the destination address is determined.

The IP packet redirection unit according to claim 11, comprising: a resolution destination address unit, configured to parse a private address space in which the destination address of the IP address is located; and forwarding the IP packet unit, The method directly forwards the IP packet to the network node corresponding to the destination address according to the result of the destination address parsed by the destination address unit, or forwards the data packet to the destination address through a data channel between the other IP packet redirecting unit. Network node.

The IP packet redirection unit according to claim 11, further comprising: establishing and maintaining a mapping relationship unit, configured to determine a private address space where the destination address is located,

The mapping between the IP packet and the ASN corresponding to the private address space where the destination address resides is established in the forwarding table set in the ASN.