WO2009140902A1

WO2009140902A1 - Method, system and femto gateway for implementing communication between femto cell network and macro network

Info

Publication number: WO2009140902A1
Application number: PCT/CN2009/071820
Authority: WO
Inventors: 刘清顺
Original assignee: 华为技术有限公司
Priority date: 2008-05-19
Filing date: 2009-05-15
Publication date: 2009-11-26
Also published as: CN101304610A; CN101304610B

Abstract

A method, a system and a femto-gateway for implementing communication between femto-cell network and macro network are provided in the embodiments of the present invention, wherein the method for implementing communication between femto-cell network and macro network includes: replacing the source IP address in a message/data from an FAP with the IP address of an FGW, and then sending it to the FAP; and/or replacing the destination IP address in a message/data from the macro network side with an IP address of an FAP, and then sending it to the FAP. With the embodiment of the invention, the source IP address in a message/data sent from a FAP would be converted to the IP address of the FGW accessed by the FAP, and the destination FAP address in a message/data sent from a macro network side would be converted to the IP address of the corresponding FAP, so that the communication between the FAP and the macro network side would be possible, without the need for changing the configuration of the macro network side due to the incorporation of a plurality of FAP, and thus the maintenance cost could be saved.

Description

Method, system and ultra-small gateway for communication between ultra-small cellular network and macro network The application is submitted to the Chinese Patent Office on May 19, 2008, and the application number is 200810093288. 6. The invention name is "ultra-small cellular network and The priority of the method, system and ultra-small gateway for communication between macro networks is the entire disclosure of which is incorporated herein by reference. Technical field

The present invention relates to the field of mobile communications, and in particular, to a method and system for communicating between a femto cell network and a macro network, and a Femto GateWay (FGW:). Background technique

Code Division Multiple Access (CDMA) 2000 is one of the main wireless access technologies for third-generation mobile communications. Although its data carrying capacity has been greatly improved, it still exists for rich multimedia services. Bottleneck on the air interface. In order to solve the bottleneck problem on the air interface, the Third Generation Partnership Project 2 (3GPP2) has released the High Rate Packet Data (HRPD) standard, which can improve the data transmission of the wireless interface. rate. FIG. 1 is a schematic diagram of a HRPD network architecture in the prior art. An Access Terminal (AT) passes through a Base Station Transceiver (BTS) and a Base Station Controller (BSC). And a Packet Control Function (PCF) is connected to a Packet Data Serving Node (PDSN) on the macro network side. The BTS and the BSC form an access network (AN). The A10/A11 interface is the interface between the PCF and the PDSN. The A13 interface is the session migration interface between the ANs. The A16 interface is between the ANs. Hard switch interface, A12 interface is AN and AN authentication and authorization accounting server (Authentication) Interface between Authorization Accounting (AAA), A8/A 9 is: Interface between BSC and PCF.

According to statistics, 70% of traffic in communications occurs indoors. How to effectively enhance indoor coverage is a difficult problem for operators. Increasing indoor coverage by increasing the deployment of outdoor macro base stations will result in a huge increase in investment costs, as well as various problems in site selection, computer room construction, transmission costs, and network optimization. A feasible solution is to use the macro network for outdoor coverage. The indoor access point (AP) is used for coverage, and the digital subscriber loop (DSL) broadband network is used for transmission. Home APs are plug-and-play, reducing transmission and network planning costs. To this end, the concept of a femto cell is proposed in the industry, which refers to a solution that is compatible with existing terminals and provides indoor indoor coverage through an xDSL broadband network or the Internet as a transmission bearer. FIG. 2 is a schematic diagram of a super-small cellular network architecture in the prior art. A Femto Access Point (FAP) accesses the Internet through a modem or a Home Gateway (HGW), and then passes through an ultra-small The gateway (Femto GateWay, FGW for short) is connected to the Macro Network. In Figure 2, FAP implements the functions of BTS, BSC, and PCF in Figure 1.

After the deployment of ultra-small cellular networks on existing macro networks, the following interfaces exist between ultra-small cellular networks and existing macro networks:

(1) The FAP provides the A10/A11 interface to access the PDSN in the existing macro network through the FGW;

(2) In order to support the handover between the ultra-small cellular network and the existing macro network, the FAP needs to provide the A13/A16 interface to access the existing macro network through the FGW;

(3) FAP provides AN-AAA for the A12 interface to access the existing macro network.

The A10/A11 interface is used to establish a bearer connection between the PCF and the PDSN for the packet data service user. The A13 interface can implement the session migration between the FAP and the macro network, and the A16 interface can implement the hard handover between the FAP and the macro network. , through the A12 interface can achieve AT access The number of interfaces supported by AN, AN-AAA, and PDSN is limited, and a large number of FAP accesses cannot be supported. As the number of FAPs increases, the deployment of macro network elements needs to be increased, resulting in increased costs. For each additional FAP, the network element on the macro network side needs to change the configuration, and the maintenance cost is increased. Summary of the invention

The embodiments of the present invention provide a method, a system, and an ultra-small gateway for communication between a small-sized cellular network and a macro network, and support a large number of FAPs on the ultra-small cellular network side to access the macro network. Without the need to change the configuration of the network element on the macro network side, the maintenance cost can be reduced.

Embodiments of the present invention provide a method for communication between a very small cellular network and a macro network, including:

The source Internet Protocol address in the message/data from the ultra-small access point is replaced with the Internet Protocol address of the ultra-small gateway and sent to the macro network side; and/or

The destination internet protocol address in the message/data from the macro network side is replaced with the internet protocol address of the ultra small access point and sent to the ultra small access point.

The embodiment of the invention further provides a method for communication between a very small cellular network and a macro network, including:

The ultra-small gateway receives the message sent by the ultra-small access point for requesting authentication;

The ultra-small gateway forwards the message for requesting authentication to the access network authentication and authorization charging server according to the username field in the message for requesting authentication.

The embodiment of the invention further provides an ultra-small gateway, including:

a receiving module, configured to receive a message/data from a macro network side or from a small-sized access point; an address replacement module, configured to receive, by the receiving module, a message/data from the ultra-small access point Replacing the source Internet Protocol address with the Internet Protocol address of the ultra-small gateway, or replacing the destination Internet Protocol address in the message/data from the macro network side with the Internet Protocol address of the ultra-small access point;

a sending module, configured to send a message/data after the address replacement module performs address replacement To the macro network side or the ultra-small access point.

a second receiving module, configured to receive a message sent by the ultra-small access point for requesting authentication, or receive a message sent by the access network authentication and authorization charging server to indicate that the authentication is passed;

a second forwarding module, configured to send, according to the username field in the message for requesting authentication, a message sent by the received ultra-small access point for requesting authentication to the access network The authentication authorization charging server, or according to the identifier field in the message for indicating the authentication pass, the received message sent by the access network authentication authorization charging server to indicate the authentication pass Sent to the ultra-small access point.

An embodiment of the present invention further provides a system for communicating between a small-sized cellular network and a macro network, including: at least one ultra-small access point and at least one ultra-small gateway.

The ultra-small access point is configured to send a message/data to the ultra-small gateway or receive a message/data sent by the ultra-small gateway;

The ultra-small gateway is configured to receive a message/data from a macro network side or from the ultra-small access point, and replace the received source internet protocol address in the message/data from the ultra-small access point with The Internet Protocol address of the ultra-small gateway, or the destination Internet Protocol address in the message/data from the macro network side is replaced with the Internet Protocol address of the ultra-small access point, and the message after the address replacement is/ Data is sent to the macro network side or the ultra small access point.

The embodiment of the present invention converts the source IP address in the message/data sent by the FAP into the IP address of the FGW accessed by the FAP, and converts the destination IP address in the message/data sent by the macro network side into the corresponding FAP. The IP address is used to implement the message/data interaction between the FAP and the macro network side. No matter how many FAPs access the FGW, only the IP address of the FGW or the IP addresses of several FGWs are presented for the macro network side. The macro network side only needs to store and record information about the FGW without changing the configuration due to the joining of multiple FAPs, which can save maintenance costs.

The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DRAWINGS

FIG. 1 is a schematic diagram of a HRPD network architecture in the prior art;

2 is a schematic diagram of a super-small cellular network architecture in the prior art;

3 is a flow chart showing a first embodiment of a method for communicating between a very small cellular network and a macro network according to the present invention;

4 is a flow chart showing a second embodiment of a method for communicating between a very small cellular network and a macro network according to the present invention;

FIG. 5 is a flowchart of Embodiment 3 of a method for communicating between a very small cellular network and a macro network according to the present invention;

6 is a flow chart showing a fourth embodiment of a method for communicating between a very small cellular network and a macro network according to the present invention;

7 is a flow chart showing a fifth embodiment of a method for communicating between a very small cellular network and a macro network according to the present invention;

8 is a flow chart showing a sixth embodiment of a method for communicating between a very small cellular network and a macro network according to the present invention;

9 is a flow chart showing a seventh embodiment of a method for communicating between a very small cellular network and a macro network according to the present invention;

FIG. 10 is a flowchart showing an eighth embodiment of a method for communicating between a very small cellular network and a macro network according to the present invention; FIG.

FIG. 11 is a schematic structural diagram of Embodiment 1 of a super-small gateway according to the present invention;

12 is a schematic structural diagram of Embodiment 2 of a super-small gateway according to the present invention;

13 is a schematic structural diagram of Embodiment 3 of a super-small gateway according to the present invention;

FIG. 14 is a schematic structural diagram of Embodiment 4 of a super-small gateway according to the present invention; FIG.

FIG. 15 is a schematic structural diagram of Embodiment 5 of the ultra-small gateway according to the present invention. detailed description FIG. 3 is a flowchart of Embodiment 1 of a method for performing communication between a very small cellular network and a macro network according to the present invention, which specifically includes:

Step 101: Convert the source IP address in the message/data sent by the FAP into an Internet Protocol (IP) address of the FGW accessed by the FAP, and send it to the macro network side;

Step 102: Convert the destination IP address in the message/data sent by the macro network side to the IP address of the FAP, and send the processed message/data to the ultra-small access point.

The first embodiment of the present invention converts the source IP address in the message/data sent by the FAP into the IP address of the FGW accessed by the FAP, and converts the destination IP address in the message/data sent by the macro network side into a corresponding FAP. IP address, to achieve FAP and macro network side message / data interaction, no matter how many FAP access to a FGW, for the macro network side, only one FGW IP address or several FGW IP addresses are presented. In this way, the macro network side only needs to store and record information about the FGW without changing the configuration (ie, storing and recording information of each FAP) due to the joining of multiple FAPs, which can save maintenance costs.

FIG. 4 is a second flowchart of a method for performing communication between a very small cellular network and a macro network according to the present invention, which specifically includes:

Step 201: Convert the destination IP address in the message/data sent by the macro network side to the corresponding FAP IP address, and send it to the FAP.

Step 202: Convert the source IP address in the message/data sent by the FAP into an IP address of the FGW accessed by the FAP, and send the processed message/data to the macro network side.

In the second embodiment of the present invention, the destination IP address in the message/data sent by the macro network side is converted into the IP address of the corresponding FAP, and the source IP address in the message/data sent by the FAP is converted into the FGW accessed by the FAP. IP address, to achieve FAP and macro network side message / data interaction, no matter how many FAP access to a FGW, for the macro network side, only one FGW IP address or several FGW IP addresses are presented. In this way, the macro network side only needs to store and record information about the FGW without changing the configuration (ie, storing and recording information of each FAP) due to the joining of multiple FAPs, which can save maintenance costs. The first embodiment is applicable to the case where the FAP side initiates the message/data transmission, and the second embodiment is applicable to the case where the macro network side initiates the message/data transmission.

Since the FAP and the macro network side message/data interaction according to various interfaces are involved, the following describes the specific steps when the message/data interaction is performed based on each interface.

First, FAP and macro network side message/data interaction based on A10/A11 interface

FIG. 5 is a flowchart of Embodiment 3 of a method for performing communication between a super small cellular network and a macro network according to the present invention. The third embodiment shows a message/data interaction between the FAP and the PDSN on the macro network side. specific process. According to the definition of the A10/A11 interface, the PDSN identifies an A10 connection by using the PCF IP address and the key value (A10 KEY) (the connection between the ultra-small cellular network side and the macro network side in the embodiment of the present invention is a communication connection), in this implementation. In the third example, for each connection, the FGW will reassign a key value (A10 KEY). In order to distinguish the key value of the FAP assignment (A10 KEY) and the key value assigned by the FGW (A10 KEY), the first in this embodiment is used. The key value (FAP_A10-KEY) represents the key value of the FAP allocation (A10 KEY), and the second key value (FGW_A10-KEY) is used to represent the key value (A10 KEY) assigned by the FGW. The third embodiment specifically includes:

Step 301: The FAP sends an Al1 registration request message (Al1 -Registration Request) of the FAP to the FGW, where the All registration request message includes the first key value of the FAP allocation.

Step 302: The FGW receives an All Registration Request message (Al 1 -Registration Request) from the FAP. If it is determined to be a new A10 connection establishment request message, the FGW allocates a second key value to the connection (FGW_A10— KEY ), if the All-Registration Request contains multiple first key values of the FAP allocation (FAP_A10-KEY), the Bayesl FGW needs to allocate multiple second key values (FGW-A10- KEY) corresponds to the first key value (FAP_A10-KEY) assigned by the multiple FAPs; then the FGW replaces the care-of address in the All-Registration Request with the IP address of the FGW, and uses the second The key value (FGW_A10-KEY) replaces the first key value of the FAP allocation (FAP_A10-KEY), and recalculates the message digest algorithm 5 (Message-Digest Algorithm 5, MD5) of the All-Registration Request message. ) authentication value (MD5 message digest is used for message integrity Sex protection, after receiving the receiver, it uses the same algorithm as the sender to calculate the MD5 message digest (calculates the MD5 message digest based on the message content and shared key), and compares it with the message digest in the message. If they are equal, the message is not Malicious modification. Since the FGW modifies the key value and the care-of address, the MD5 message digest should be recalculated after the modification is completed, placed in the corresponding information unit in the message, and then the subsequent message processing step), the IP packet in the message The source address is replaced with the IP address of the FGW, and then the processed message is sent to the PSDN on the macro network side.

Step 303: The PSDN sends an All-Registration Reply message to the FGW. Step 304: After receiving the All-Registration Reply message, the FGW replaces the second key value (FGW_A10-KEY) in the message with the first key value allocated by the FAP for the connection. FAP—A10— KEY ), recalculates the MD5 authentication value of the Al 1 -Registration Reply message, and replaces the destination IP address of the IP packet in the message with the All-Reistration Request message. The IP address of the FAP (All Registration Request message and All Registration Reply message contain an International Mobile Subscriber Identity (IMSI)) through which the FGW can learn the All Registration Request message and the All Registration Reply message. Corresponding relationship, so that the FGW can determine which IP address of the FAP is replaced by the destination IP address of the IP packet in the All registration response message, and determine which first key value to replace the second key value in the All registration response message with ); if the All-Registration Reply indicates that the PDSN accepts the connection establishment, it is also required Set the second key value (FGW—A10—KEY) and the mapping relationship between the IP address of the FGW and the first key value (FAP—A10—KEY) and the IP address of the FAP, that is, a first key value (FAP—A10—KEY And the combination of the IP address of the FAP, corresponding to a combination of a second key value (FGW_A10-KEY) and the IP address of the FGW, for subsequent data exchange between the FAP and the PDAN; then the FGW will process the All The All-Registration Reply message is sent to the corresponding FAP.

For subsequent messages between the FAP and the macro network (not shown in Figure 3), similar replacements are required for A10-KEY, replacing the IP address of the FAP, replacing the FAP to the care-of address in the PDSN message, and regenerating the MD5 authentication. Value and other operations. After the A10 connection is established between the FAP and the PDSN based on the All interface, the FAP and the PDSN start data interaction. Specifically, the following steps are included:

Step 305: The FAP sends an A10 Generic Routing Encapsulation Packet (A10 GRE Packet) to the FGW.

Step 306: After receiving the A10 GRE packet (A10 GRE Packet), the FGW, according to the second key value (FGW_A10-KEY) established in step 304, and the IP address of the FGW and the first key value (FAP— A10—KEY) and the IP address mapping of the FAP, replace the source IP address in the A10 GRE packet (A10 GRE Packet) with the IP address of the corresponding FGW, and replace the first key value (FAP A10 KEY) with the corresponding one. The second key value (FGW_A10-KEY), then the FGW sends the processed A10 GRE packet (A10 GRE Packet) to the PDSN.

Step 307: The PDSN sends an A10 GRE packet (A10 GRE Packet) to the FGW.

Step 308: After receiving the A10 GRE packet (A10 GRE Packet) sent by the PDSN, the FGW, according to the second key value (FGW_A10-KEY) established in step 304, and the IP address of the FGW and the first key value (FAP) — A10— KEY) and the mapping of the IP address of the FAP, replacing the destination IP address in the A10 GRE packet (Al O GRE Packet) with the IP address of the corresponding FAP, and the second key value (FGW—A10—KEY) Replace with the corresponding first key value (FAP_A10-KEY); then the FGW sends the processed A10 GRE packet (A10 GRE Packet) to the FAP.

In the third embodiment of the present invention, the source IP address in the message sent by the FAP to the PDSN is replaced with the IP address of the FGW, and the first key value (FAP_A10-KEY) allocated by the FAP for the connection is replaced by the second key allocated by the FGW. The value (FGW_A10-KEY) replaces the destination IP address in the message sent by the PDSN to the FAP with the IP address of the corresponding FAP, and replaces the second key value (FGW_A10-KEY) with the first key value ( FAP—A10—KEY), so that only the IP address of the FGW is presented for the PDSN, and the configuration information does not need to be changed, and the message interaction between the FAP and the PDSN can be implemented at the same time.

Second, the A13/A16 interface performs FAP and macro network side message interaction

The Unicast Access Terminal Identifier (UATI) is the identifier assigned by the FAP to the access terminal AT. It has two formats: UATI128 and UATI32. The 104-bit UATI104 replaces the color code (Color Code). The color code has a length of 8 bits. That is, the color code and UATI024 form UATI32. The AT identifier based on the A16 interface is UATI32, and the AT identifier based on the A13 interface is used. UATI128.

Since one FGW may have multiple FAP accesses, the UATIs assigned by each FAP may be the same. When the FAP interacts with the macro network side message based on the A13/A16 interface, the mapping between the UATI and the FAP needs to be established. In order to ensure the uniqueness of the UATI allocated by each FAP under the FGW, the UATI024 is split into two parts, namely FAP_Index and UATI-FAP. The FAP-Index is the high m-bit of UATI024, indicating the FAP index, which is in the subnet. Unique; UATI-FAP is the low n-bit of UATI, unique within FAP, assigned by FAP, where n=24-m, m and n are natural numbers. When the FAP is started, the FGW configures the subnet identifier (UATI104 and color code) and the FAP index to which the FAP belongs to the FAP for use by the FAP to allocate the UATI to the AT. This ensures that the UATI assigned by each FAP is unique.

FIG. 6 is a flowchart of Embodiment 4 of a method for communicating between a very small cellular network and a macro network according to the present invention. The fourth embodiment of the present invention is an active state switching process of an AN in a FAP to a macro network, which specifically includes:

Step 401: The FAP sends an A16-Session Transfer Request message to the FGW. The FAP can determine a target AN. In the A16-Session Transfer Request, the destination IP address is the IP address of the target AN, and the destination port number is the A16-known port number.

Step 402: After receiving the A16-Session Transfer Request message sent by the FAP, the FGW records the correspondence between the AT-ID and the FAP in the message; the AT-ID is in the A16 session migration request message. An information unit is an identifier assigned by the FAP to the AT. The AT-ID is carried in the message exchanged between the subsequent FAP and the AN, and the AT-ID is a UATI with a length of 32 bits; then the FGW migrates the A16 session. The source IP address in the request message (A16-Session Transfer Request) is replaced with the IP address of the FGW, and then the A16-Session Transfer Request message (A16-Session Transfer Request) is sent to the AN.

Step 403: The AN sends an A16 session migration response message (A16-Session Transfer Response) To the FGW.

Step 404: After receiving the A16 session migration response message (A16-Session Transfer Response) sent by the AN, the FGW searches for the corresponding relationship between the AT-ID and the FAP recorded in step 402 according to the AT-ID in the message. The corresponding FAP, then replaces the destination IP address in the message with the IP address of the corresponding FAP, and sends the processed A16 session migration response message (A16-Session Transfer Response) to the corresponding FAP.

Step 405: The FAP sends an A16-Session Transfer Complete message to the FGW.

Step 406: After receiving the A16 session migration complete message (A16-Session Transfer Complete) sent by the FAP, the FGW replaces the source IP address in the message with the IP address of the FGW, and then completes the A16 session migration after the replacement processing. The message (A16-Session Transfer Complete) is sent to the AN.

Step 407: The AN sends an A16-Session Release Indication to the FGW.

Step 408: The FGW receives the A16 session release indication message sent by the AN (A16-Session

After the Release Indication, the corresponding relationship between the AT-ID and the FAP recorded in step 402 is queried according to the AT-ID in the message, and the corresponding FAP is found, and then the destination IP address in the message is replaced by the IP address of the corresponding FAP. The address is sent to the corresponding FAP by the processed A16-Session Release Indication.

Step 409: The FAP sends an A16 session release indication confirmation message (A16-Session Release

Indication ACK) to FGW.

Step 410: After the FGW receives the A16-Session Release Indication ACK sent by the FAP, if the AT-ID in the message is not a UATI (Long Code Mask UATI) that generates a long code mask. LCM - UATI ) (The AT-ID in the message is not LCM - UATI indicates that no message will be sent to the FAP in the future), then the FGW releases the correspondence between the AT-ID and the FAP recorded in step 402, if The AT-ID in the message is LCM - UATI (The AT-ID in the message is LCM - UATI indicates that a message will be sent to the FAP in the future), and the correspondence between the AT-ID and the FAP recorded in step 402 is not released; A13-Keep Alive Request, A13-Keep Alive Response, A13-Resource Release Request, and A13-Resource Release Response (A13-Resource Release Response) The FAP is sent to the LCM-UATI corresponding FAP; then the FGW replaces the source IP address in the A16-Session Release Indication ACK with the IP address of the FGW, and sends the processed message to the AN.

Step 411: The AN sends an A13 Keep Alive Request message to the FGW. Step 412: The FGW receives the A13 keepalive request message sent by the AN (A13-Keep Alive)

After the request, the corresponding relationship between the AT-ID and the FAP recorded in step 402 is queried according to the AT-ID in the message, and the corresponding FAP is found, and then the destination IP address in the message is replaced by the IP address of the corresponding FAP. And send the processed A13-Keep Alive Request message to the corresponding FAP.

Step 413: The FAP sends an A13-Keep Alive Response message to the FGW. Step 414: After receiving the A13-Keep Alive Response message sent by the FAP, the FGW replaces the source IP address in the message with the IP address of the FGW, and then replaces the A13 keep-alive response. The message (A13-Keep Alive Response) is sent to the AN.

Step 415: The AN sends an A13 Resource Release Request message (A13-Resource Release Request) to the FGW.

Step 416: After receiving the A13 resource release request message (A13-Resource Release Request) sent by the AN, the FGW obtains an AT-ID according to the UATI128 in the message (the FGW needs to configure the correspondence between the UATI 104 and the color code), and then according to the AT. -ID queries the mapping between the AT-ID and the FAP recorded in step 402, finds the corresponding FAP, and then replaces the destination IP address in the message with the IP address of the corresponding FAP, and releases the processed A13 resource. The request message (A13-Resource Release Request) is sent to the corresponding FAP. Step 417: The FAP sends an A13 Resource Release Response message (A13 - Resource Release Response) to the FGW.

After receiving the A13 resource release response message (A13-Resource Release Response) sent by the FAP, the FGW replaces the source IP address in the message with the IP address of the FGW, and then releases the A13 resource release response after the replacement process. The message (A13-Resource Release Response is sent to the AN, and the correspondence between the AT-ID and the FAP is released.

In the fourth embodiment of the present invention, the correspondence between the AT-ID and the FAP is first established. For the message from the FAP, the source IP address in the message is replaced with the IP address of the FGW, and the message from the AN is based on the message. The AT-ID, by querying the correspondence between the AT-ID and the FAP, finds a unique FAP, and then replaces the destination IP in the message from the AN with the IP address of the corresponding FAP, thus implementing AN and FAP. The message exchange between the two is presented to the IP address of the FGW. Regardless of the number of FAPs, the network elements in the AN do not need to change the configuration, which reduces maintenance costs.

FIG. 7 is a flowchart of Embodiment 5 of a method for performing communication between a super small cellular network and a macro network according to the present invention. The fifth embodiment shows an active state switching process from AN to FAP, and the handover is initiated by the AN. After determining the target FAP, the FGW establishes a correspondence between the AT-ID and the FAP, and searches for the message exchange between the FAP and the AN. For the message from the AN, the destination IP address in the message is queried by the AT- The relationship between the ID and the FAP is replaced by the IP address of the FAP corresponding to the AT-ID in the message. For the message from the FAP, the FGW replaces the source IP address in the message with the IP address of the FGW, so that the FAP can be implemented. Message interaction between ANs. The fifth embodiment differs from the fourth embodiment in that: in the fifth embodiment, the A13 keep-alive response message (A13-Keep Alive Response) sent by the AN to the FGW does not carry the AT-ID assigned by the AN, but The FATI-assigned UATI 128 is carried. Therefore, after the FGW receives the message sent by the FAP, the FGW needs to establish a correspondence between the UATI 128 and the FAP in the message, and is used by the FGW in step 513 to determine the target FAP.

In the fifth embodiment of the present invention, the correspondence between the AT-ID and the FAP and the UATI128 are established. The correspondence between the FAPs, for the message from the FAP, replaces the source IP address in the message with the IP address of the FGW, and for the message from the AN, based on the AT-ID or UATI128 in the message, by querying the AT-ID or UATI128 Correspondence with the FAP, find a unique FAP, and then replace the destination IP in the message from the AN with the IP address of the corresponding FAP, thus implementing message interaction between the AN and the FAP, for the AN The IP address of the FGW is presented. Regardless of the number of FAPs, the network elements in the AN do not need to change the configuration, which reduces maintenance costs.

Third, FAP and macro network side message interaction based on A13 interface

FIG. 8 is a flowchart of Embodiment 6 of a method for performing communication between a very small cellular network and a macro network according to the present invention. The sixth embodiment shows a session migration switching process of an AN from a FAP to a macro network, specifically including :

Step 601: The AN sends an A13-Session Information Request to the FGW.

Step 602: After receiving the A13-Session Information Request sent by the AN, the FGW searches for the corresponding FAP by using the subnet identifier and the index of the FAP according to the subnet identifier (UATI104) in the message. The destination IP address in the message is replaced with the IP address of the corresponding FAP, and the message processed by the replacement is sent to the FAP.

Step 603: The FAP sends an A13 Session Information Response message (A13-Session Information Response) to the FGW.

Step 604: After receiving the A13 session information response message (A13-Session Information Response) sent by the FAP, the FGW replaces the source IP address in the message with the IP address of the FGW, and sends the replaced message to the AN.

Step 605: The AN sends an A13 Session Information Confirmation message (A13 - Session Information Confirmation) to the FGW.

Step 606: After receiving the A13-Session Information Confirmation message sent by the AN, the FGW searches for the corresponding FAP by using the subnet identifier and the index of the FAP according to the subnet identifier (UATI104) in the message. Replace the destination IP address in the message with the corresponding one. The IP address of the FAP, and the message processed by the replacement is sent to the FAP.

In the sixth embodiment of the present invention, the session migration is initiated by the AN, and the FGW finds the IP address of the corresponding FAP according to the subnet identifier (UATI104), and uses the IP address of the corresponding FAP found in the destination IP address sent by the AN. In the case of the message from the FAP, the source IP address in the message is replaced with the IP address of the FGW. This allows the session to be migrated from the FAP to the AN without the network side NE changing configuration and saving network maintenance costs.

In the sixth embodiment, since the session migration is not necessary, in step 602, after receiving the A13-Session Information Request sent by the AN, the FGW may send an A13 session information rejection message to the AN (A13). -Session Information Reject), triggers the AN to re-negotiate the session with the AT, and the session on the FAP can be released through the standard session keep-alive mechanism.

FIG. 9 is a flowchart of Embodiment 7 of a method for communicating between a small-sized cellular network and a macro network according to the present invention. The seventh embodiment shows a session migration switching process of an AN to a FAP in a macro network, which specifically includes :

Step 701: The FAP sends an A13-Session Information Request to the FGW.

Step 702: After receiving the A13-Session Information Request sent by the FAP, the FGW establishes a correspondence between the UATI 128 and the FAP according to the UATI 128 in the message, and replaces the source IP address in the message with the FGW. The IP address, and the message processed by the replacement is sent to the AN.

Step 703: The AN sends an A13 session information response message (A13 - Session Information)

Response ) to FGW.

Step 704: After receiving the A13 session information response message (A13-Session Information Response) sent by the AN, the FGW searches the corresponding relationship between the UATI 128 and the FAP established in step 702 according to the UATI 128 in the message to find the corresponding FAP. The destination IP address in the message is replaced with the IP address of the corresponding FAP, and the replaced message is sent to the corresponding FAP.

Step 705: The FAP sends an A13 session information confirmation message (A13-Session Information) Confirmation ) to FGW.

Step 706: After receiving the A13-Session Information Confirmation message sent by the FAP, the FGW replaces the source IP address in the message with the IP address of the FGW, and sends the replaced message to the AN. .

In the seventh embodiment of the present invention, the session migration is initiated by the FAP, and the FGW establishes a correspondence between the UATI 128 and the FAP according to the UATI 128 in the message sent by the FAP, and uses the message exchanged between the subsequent FAP and the AN. For the message from the FAP, the FGW The source IP address in the message is replaced with the IP address of the FGW. For the message from the AN, the FGW searches for the corresponding FAP by querying the corresponding relationship between the UATI 128 and the FAP, and replaces the message sent by the AN with the address of the corresponding FAP found. The destination IP address in the network can be used to implement session migration from the AN to the FAP without changing the configuration on the network side NE and saving network maintenance costs.

Fourth, FAP and macro network side message interaction based on A12 interface

The FAP authenticates to the AN-AAA through the A12 interface. The FGW can be used as a proxy AN-AAA. The IP address of the AN-AAA is set to the IP address of the FGW in the message sent by the FAP, thereby implementing the FAP and the macro network side. Message interaction between AN-AAA.

FIG. 10 is a flowchart of Embodiment 8 of a message interaction method between a small-sized cellular network access point and a macro network according to the present invention. The eighth embodiment shows an authentication process of the AN-AAA in the FAP to the macro network. Specifically, including:

Step 801: The FAP sends an A12 Access Request message (A12 Access Request) for requesting authentication to the FGW.

In this embodiment, the FGW is used as the proxy AN-AAA, so the destination IP address of the A12 access request message is the IP address of the FGW, the source IP address is the IP address of the FAP, and the A12 access request message includes the FAP. a first identifier (Identifier) assigned to the A12 access request message (stored in the identifier field of the A12 access request message), and a "User-Name" field, "CHAP (Challenge-Handshake) Authentication Protocol, Challenge Handshake Authentication Protocol) -Password" and "CHAP-Challenge" attributes, etc., the "CHAP-Password" attribute Contains the CHAP identity and CHAP response from the access terminal AT.

Step 802: After receiving the A12 access request message (A12 Access Request) sent by the FAP, the FGW sends the message according to the “User-Name” field in the A12 Access Request message (A12 Access Request). Forward to the corresponding AN-AAA.

Specifically, after receiving the A12 access request message sent by the FAP, the FGW allocates a second identifier (Identifier) for the A12 access request message, and saves the context information of the current authentication (such as FAP) by using the second identifier as an index. IP address, first identifier (Identifier), etc., and replace the first identifier (Identifier) in the A12 access request message with the second identifier (Identifier), and replace the destination IP address of the A12 access request message After the source IP address is replaced with the IP address of the FGW according to the IP address of the AN-AAA determined according to the User-Name field, the A12 access request message is sent to the corresponding AN-AAA.

Step 803: The AN-AAA receives the A12 access request message, performs access authentication processing on the access terminal AT, and completes the access authentication process of the access terminal AT, and sends an A12 indicating that the authentication is passed to the FGW. Access Accept Message (A12 Access Accept).

Specifically, the AN-AAA receives the A12 access request message, and the AN-AAA calculates the CHAP response by using the key corresponding to the user name (User-Name) in the A12 access request message, the CHAP identifier, and the CHAP-Challenge, and the A12 The CHAP response in the access request message is compared. If the same, the access authentication of the access terminal AT is passed, and the identifier of the A12 access accept message is set to be the second identifier in the A12 access request message. Identifier (that is, the second identifier is stored in the identifier field of the A12 access accept message), and the first response verification code is generated by using the shared key between the AN-AAA and the FGW preset in the AN-AAA. And transmitting the first response verification code to the FGW in the A12 access accept message, where the destination IP address of the A12 access accept message is the IP address of the FGW, and the source IP address is the IP address of the AN-AAA.

Step 804: After receiving the A12 Access Accept message, the FGW sends the message to the corresponding FAP according to an identifier (Identifier) field in the A12 access accept message.

Specifically, after the FGW receives the A12 access accept message, the FGW uses the preset in the FGW. The shared key between the FGW and the AN-AAA calculates a response verification code, and determines whether the response verification code is the same as the first response verification code carried in the A12 access accept message. If they are the same (indicating that the verification is successful), according to A12 The second identifier (Identifier) in the access accept message indexes the context information, obtains the first identifier (Identifier) and the IP address of the FAP saved by the FGW, and replaces the A12 access accept message with the obtained first identifier (Identifier) a second identifier (Identifier), which uses the shared key between the FGW and the FAP preset in the FGW to generate a second response verification code to replace the first response verification code in the A12 access accept message, and access the A12 The destination IP address in the received message is replaced with the IP address of the FAP. After the source IP address is replaced with the IP address of the FGW, the A12 access accept message is sent to the corresponding FAP. If they are not the same, they are not processed. Embodiment 8 of the present invention sets the destination IP address in the message sent by the FAP to the IP address of the FGW by using the FGW as a proxy AN-AAA, and the FGW forwards the message from the FAP to the AN-AAA, and the message from the AN-AAA The message is forwarded to the FAP, so that the authentication of the FAP to the AN-AAA can be implemented without changing the configuration of the macro network side network element and saving the network maintenance cost.

FIG. 11 is a schematic structural diagram of Embodiment 1 of a super-small gateway according to the present invention. The gateway specifically includes: a receiving module 11 configured to receive messages/data from a macro network side or from a small-sized access point; and an address replacement module 12, Used to replace the source IP address in the message/data from the ultra-small access point with the IP address of the ultra-small cellular gateway, or to replace the destination IP address in the message/data from the macro network side with the ultra-small access point The sending module 13 is configured to send the message/data after the address replacement by the address replacing module 12 to the macro network side or the ultra-small access point.

FIG. 12 is a schematic structural diagram of Embodiment 2 of the ultra-small gateway of the present invention. On the basis of the structure shown in FIG. 11, the ultra-small gateway of the second embodiment further includes: a key value distribution module 18, which is connected to the receiving module 11 and used. After receiving the registration request message from the ultra-small access point, the receiving module 11 assigns a second key value to the new communication connection; the first mapping module 14, the key value distribution module 18, the address replacement module 12, and the receiving module 11 connection, used to establish the mapping relationship between the second key value (FGW_A10-KEY) and the IP address of the FGW and the first key value (FAP_A10-KEY) in the received registration request message and the IP address of the FAP ; the care-of address replacement module 17, And the first mapping module 14 and the receiving module 11 are configured to replace the care-of address in the message received by the receiving module 11 with the IP address of the ultra-small gateway; the key value replacement module 16, and the care-of address replacement module 17, the first The mapping module 14, the address replacement module 12, and the receiving module 11 are connected, and are used for the message processed by the care-of address replacing module 17 and the data received by the receiving module, according to the second key value established by the first mapping module 14 (FGW- A10—KEY) and the mapping relationship between the IP address of the FGW and the first key value (FAP—A10—KEY) and the IP address of the FAP, using the first key value in the second key value in the message/data from the macro network side Alternatively, the first key value in the message/data from the ultra-small access point is replaced with the second key value, and the processed data is sent to the address replacement module 12; the authentication value generating module 15 is replaced with the key value The module 16 and the address replacement module 12 are connected, and are used to regenerate the message digest algorithm five authentication values of the message processed by the key value replacement module 16, and will be processed Message 12 sent to the address replacement module.

The key value replacement module 16 may include:

The first key value replacement module 161 is connected to the first mapping module 14 and the receiving module 11, and is configured to receive the data received by the receiving module 11 according to the second key value established by the first mapping module 14 and the Internet of the ultra-small gateway. The mapping relationship between the protocol address and the first key value and the Internet Protocol address of the ultra-small access point, replacing the second key value in the data from the macro network side with the first key value, and the data from the ultra-small access point The first key value in the field is replaced with the second key value;

The second key value replacement module 162 is connected to the first mapping module 14, the care-of address replacing module 17, and the authentication value generating module 15 for using the message processed by the care-of address replacing module 17 to be established according to the first mapping module 14. The second key value and the mapping relationship between the Internet Protocol address of the ultra-small gateway and the first key value and the Internet Protocol address of the ultra-small access point, and the second key value in the message from the macro network side is replaced by the first key value And replacing the first key value in the message from the ultra-small access point with the second key value, and sending the processed message to the authentication value generating module.

The address replacement module 12 can include:

The first address replacement module 121 is connected to the first key value replacement module 161, the first mapping module 14, and the sending module 13, and is configured to process the data processed by the first key value replacement module 161. According to the mapping relationship between the second key value established by the first mapping module 14 and the Internet Protocol address of the ultra-small gateway and the Internet address of the first key value and the ultra-small access point, the destination Internet in the data from the macro network side The protocol address is replaced with the Internet Protocol address of the ultra-small access point, and the source Internet Protocol address in the data from the ultra-small access point is replaced with the Internet Protocol address of the ultra-small gateway, and the processed data is sent to the sending module. 13;

The second address replacement module 122 is connected to the authentication value generating module 15, the first mapping module 14, and the sending module 13 for using the message processed by the authentication value generating module 15 according to the second key established by the first mapping module 14. The value and the mapping relationship between the Internet Protocol address of the ultra-small gateway and the first key value and the Internet Protocol address of the ultra-small access point, and the Internet Protocol of the ultra-small access point from the destination Internet Protocol address in the message on the macro network side The address replacement replaces the source Internet Protocol address in the message from the ultra-small access point with the Internet Protocol address of the ultra-small gateway, and sends the processed message to the sending module 13.

FIG. 13 is a schematic structural diagram of Embodiment 3 of the ultra-small gateway of the present invention. On the basis of the structure shown in FIG. 11, the ultra-small gateway in the third embodiment further includes: a second mapping module 20, configured to receive according to the receiving module 11 The unicast identifier of the access terminal in the message from the ultra-small access point or the macro network side is established, and the correspondence between the unicast identifier of the access terminal and the ultra-small access point is established.

FIG. 14 is a schematic structural diagram of Embodiment 4 of the ultra-small gateway of the present invention. On the basis of the structure shown in FIG. 11, the ultra-small gateway in the fourth embodiment further includes: an index configuration module 21, configured to store the ultra-small access point. The subnet ID and index configuration of the subnet and the index configuration of the super small access point to be sent to the ultra-small access point are used for the address replacement module 12 to query.

FIG. 15 is a schematic structural diagram of Embodiment 5 of the ultra-small gateway according to the present invention. If the FGW is used as the proxy AN-AAA, the FGW is configured as shown in FIG. 15. The FGW includes: a second receiving module 31, configured to receive The message sent by the ultra-small access point for requesting authentication, or the message sent by the access network authentication and authorization accounting server for indicating the authentication pass; the second forwarding module 32, configured to request the authentication The username field in the message of the right, sends the message sent by the received ultra-small access point for requesting authentication to the access network authentication and authorization accounting server, or according to the table The identifier field in the message passed by the authentication authority sends the received message sent by the access network authentication and authorization accounting server to indicate the authentication pass to the ultra-small access point.

The embodiment of the present invention further provides a system for communicating between a small-sized cellular network and a macro network, where the system may include at least one FAP and at least one FGW, where the FGW may be as shown in FIG. 11, 12, 13, 14, or 15. The FGW shown.

The embodiment of the present invention converts the source IP address in the message/data sent by the FAP into the IP address of the FGW accessed by the FAP, and converts the destination IP address in the message/data sent by the macro network side into the corresponding FAP. The IP address is used to implement the message/data interaction between the FAP and the macro network side. No matter how many FAPs are connected to one FGW, only one FGW IP address is presented for the macro network side (if multiple FAPs are respectively connected to the IP address) Different FGWs present several FGW IP addresses to the macro network side. In this way, the macro network side only needs to store and record information about the FGW without changing the configuration due to the joining of multiple FAPs, which can save maintenance. cost. It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Claim

A method for communicating between a very small cellular network and a macro network, characterized in that it comprises:

2. A method of communicating between a very small cellular network and a macro network according to claim 1, wherein the source internet protocol address in the message from the ultra small access point is replaced with the internet protocol of the ultra small gateway. The address specifically includes:

Assign a second key value to a connection;

Establishing a mapping relationship between the second key value and an internet protocol address of the ultra-small gateway and the first key value and an internet protocol address of the ultra-small access point, where the first key value is the ultra-small access point Connection allocation

Replacing a care-of address in a message from the ultra-small access point with an internet protocol address of the ultra-small gateway;

Determining the first key in the message from the ultra-small access point according to the mapping relationship between the second key value and the Internet Protocol address of the ultra-small gateway and the first key value and the Internet Protocol address of the ultra-small access point The value is replaced with the second key value;

Regenerate the message digest algorithm 5 authentication value of the message after the care-of address replacement and key value replacement;

And according to the mapping relationship between the second key value and the Internet Protocol address of the ultra-small gateway and the first key value and the Internet protocol address of the ultra-small access point, the source Internet in the message of the message digest algorithm five authentication value is regenerated in the future. The protocol address is replaced with the Internet Protocol address of the ultra-small gateway.

3. A method of communicating between a very small cellular network and a macro network according to claim 2, The method includes: replacing the destination internet protocol address in the message from the macro network side with the internet protocol address of the ultra-small access point, specifically:

And using a second key value and a mapping relationship between the Internet Protocol address of the ultra-small gateway and the first key value and the Internet Protocol address of the ultra-small access point, using the second key value in the message from the macro network side The first key value is replaced;

Regenerate the message digest algorithm five authentication values of the message after the key value replacement;

Determining, according to the mapping relationship between the second key value and the Internet Protocol address of the ultra-small gateway and the Internet address of the first key value and the ultra-small access point, the destination Internet protocol address in the message from the macro network side The Internet Protocol address replacement of the ultra-small access point corresponding to the first key value.

4. A method of communicating between a very small cellular network and a macro network according to claim 1, wherein the source internet protocol address in the data from the ultra small access point is replaced with the internet protocol of the ultra small gateway. The address specifically includes:

Assign a second key value to a connection;

And determining, according to the second key value and the mapping relationship between the Internet Protocol address of the ultra-small gateway and the first key value and the Internet Protocol address of the ultra-small access point, the first key in the data from the ultra-small access point The value is replaced with the second key value;

Generating the source Internet protocol in the data from the ultra-small access point according to the mapping relationship between the second key value and the Internet Protocol address of the ultra-small gateway and the first key value and the Internet Protocol address of the ultra-small access point The address is replaced with the Internet Protocol address of the ultra-small gateway.

5. The method of communicating between a very small cellular network and a macro network according to claim 4, wherein a destination internet protocol address in data from said macro network side is replaced with said ultra small access The Internet Protocol address of the point specifically includes: And using the second key value and the mapping relationship between the Internet Protocol address of the ultra-small gateway and the first key value and the Internet Protocol address of the ultra-small access point, using the second key value in the data from the macro network side First key value replacement;

Determining a destination internet protocol address in the data from the macro network side according to the mapping relationship between the second key value and the internet protocol address of the ultra-small gateway and the first key value and the internet protocol address of the ultra-small access point The Internet Protocol address of the ultra-small gateway is replaced.

The method of communicating between the ultra-small cellular network and the macro network according to claim 1, further comprising:

The unicast identity of the access terminal in the message from the ultra-small access point or the macro network side is extracted, and the correspondence between the unicast identifier of the access terminal and the ultra-small access point is established.

7. The method of communicating between a very small cellular network and a macro network according to claim 6, wherein the destination internet protocol address in the message from the macro network side is replaced with the ultra small access The point of the Internet Protocol address sent to the ultra-small access point is specifically:

After receiving the message from the macro network side, according to the unicast identifier of the access terminal in the message, by querying the corresponding relationship between the unicast identifier of the access terminal and the ultra-small access point that has been established, And the ultra-small access point corresponding to the access terminal unicast identifier in the message from the macro network side, replacing the macro network with the discovered internet protocol address of the ultra-small access point The destination internet protocol address in the side message, and the processed message is sent to the ultra-small access point.

The subnet identifier and the index configuration to which the ultra-small access point belongs are sent to the ultra-small access point, and the corresponding relationship between the subnet identifier and the configuration of the sub-miniature access point is established.

9. The method of communicating between a very small cellular network and a macro network according to claim 8, wherein said replacing a destination internet protocol address in a message from said macro network side with said ultra-small After the Internet Protocol address of the access point is sent to the ultra-small access point, the specific is: After receiving the message from the macro network side, according to the subnet identifier in the message, in combination with the index configuration, the corresponding relationship with the ultra-small access point is configured according to the established subnet identifier and index. Finding a sub-miniature access point corresponding to the subnet identification and index configuration in the message, and using the discovered Internet Protocol address in the message from the macro network side to find the subnet identifier in the message and The index configuration corresponds to the Internet Protocol address replacement of the ultra-small access point, and the processed message from the macro network side is sent to the searched super-corresponding to the subnet identifier and index configuration in the message. Small access point.

10. An ultra-small gateway, comprising:

a receiving module, configured to receive a message/data from a macro network side or from a small-sized access point; an address replacement module, configured to receive, by the receiving module, a message/data from the ultra-small access point The source Internet Protocol address is replaced with an Internet Protocol address of the ultra-small gateway, or the destination Internet Protocol address in the message/data from the macro network side is replaced with an Internet Protocol address of the ultra-small access point;

And a sending module, configured to send the message/data after the address replacement by the address replacement module to the macro network side or the ultra-small access point.

The ultra-small gateway according to claim 10, further comprising: a key value allocation module, configured to be new after the receiving module receives the registration request message from the ultra-small access point Communication connection assigns a second key value;

a first mapping module, configured to establish a mapping relationship between the second key value and an internet protocol address of the ultra-small gateway and a first key value in the received registration request message and an internet protocol address of the ultra-small access point ;

a care-of address replacement module, configured to replace a care-of address in a message received by the receiving module with an internet protocol address of the ultra-small gateway;

a key value replacement module, configured to process the message processed by the care-of address replacement module and the data received by the receiving module, according to the second key value established by the first mapping module and the Internet Protocol address of the ultra-small gateway Mapping of a key value and Internet Protocol address of a very small access point And replacing, by the first key value, the second key value in the message/data from the macro network side, using the second key value in the first key value in the message/data from the ultra-small access point Substituting, and sending the processed data to the address replacement module;

The authentication value generating module is connected to the key value replacement module and the address replacement module, and is configured to regenerate a message digest algorithm five authentication value of the message processed by the key value replacement module, and send the processed message to the The address replacement module.

12. The ultra-small gateway according to claim 11, wherein the key value replacement module comprises:

a first key value replacement module, configured to receive data by the receiving module, according to the second key value established by the first mapping module, and an internet protocol address of the ultra-small gateway with the first key value and the ultra-small access a mapping relationship of the Internet Protocol address of the point, replacing the second key value in the data from the macro network side with the first key value, and using the first key value in the data from the ultra small access point Two key value replacements;

a second key value replacement module, configured to: after the message processed by the care-of address replacement module, according to the second key value established by the first mapping module and an Internet protocol address of the ultra-small gateway and the first key value and the super The mapping relationship of the Internet Protocol address of the small access point, replacing the second key value in the message from the macro network side with the first key value, and the first key in the message from the ultra small access point The value is replaced with a second key value and the processed message is sent to the authentication value generation module.

The ultra-small gateway according to claim 12, wherein the address replacement module comprises:

a first address replacement module, configured to replace the data processed by the first key value replacement module, according to the second key value established by the first mapping module, and an Internet Protocol address of the ultra-small gateway and the first key value and The mapping relationship of the Internet Protocol address of the ultra-small access point, replacing the destination Internet Protocol address in the data from the macro network side with the Internet Protocol address of the ultra-small access point, from the ultra-small access The source Internet Protocol address in the point data is used by the ultra-small gateway The Internet Protocol address is replaced, and the processed data is sent to the sending module; the second address replacing module is configured to: after the message processed by the authentication value generating module, is established according to the first mapping module a mapping relationship between the second key value and the Internet Protocol address of the ultra-small gateway and the first key value and the Internet Protocol address of the ultra-small access point, and the destination Internet Protocol address in the message from the macro network side is used by the super Replacing the Internet Protocol address of the small access point, replacing the source Internet Protocol address in the message from the ultra-small access point with the Internet Protocol address of the ultra-small gateway, and transmitting the processed message to the Send module.

The ultra-small gateway according to claim 10, further comprising: a second mapping module, configured to be used according to the message received by the receiving module from the ultra-small access point or the macro network side The unicast identifier of the access terminal establishes a correspondence between the unicast identifier of the access terminal and the ultra-small access point.

The ultra-small gateway according to claim 10, further comprising: an index configuration module, configured to store a subnet identifier and an index configuration to which the ultra-small access point belongs, and store the ultra-small access point The subnet identification and index configuration is sent to the ultra-small access point, and is used for the address replacement module query.

16. A method of communicating between a very small cellular network and a macro network, the method comprising:

The ultra-small gateway receives the message sent by the ultra-small access point for requesting authentication; the ultra-small gateway sends the message for requesting authentication according to the username field in the message for requesting authentication Forward to the access network authentication and authorization accounting server.

17. The method of communicating between a very small cellular network and a macro network according to claim 16, further comprising:

The ultra-small gateway receives a message sent by the access network authentication and authorization charging server to indicate that the authentication is passed;

And the ultra-small gateway forwards the message for indicating the passing of the authentication to the ultra-small access point according to the identifier field in the message used to indicate the authentication pass.

18. An ultra-small gateway, comprising:

a second forwarding module, configured to send, according to the username field in the message for requesting authentication, a message sent by the received small-sized access point for requesting authentication to the access network The authentication authorization charging server, or according to the identifier field in the message for indicating the authentication pass, the received message sent by the access network authentication authorization charging server to indicate the authentication pass Sent to the ultra-small access point.

19. A system for communicating between a very small cellular network and a macro network, the method comprising: at least one ultra-small access point and at least one ultra-small gateway.

The ultra-small gateway is configured to receive a message/data from a macro network side or from the ultra-small access point, and replace the received source internet protocol address in the message/data from the ultra-small access point with The Internet Protocol address of the ultra-small gateway, or the destination Internet Protocol address in the message/data from the macro network side in the future, is replaced with the Internet Protocol address of the ultra-small access point, and the message after the address replacement is/ Data is sent to the macro network side or the ultra small access point.