CN1292554C - User accessing method for realing CDMA system and wireless LAN joint - Google Patents

Abstract

The present invention provides a user access method for realizing the combination of CDMA system and WLAN, which includes the following steps: WLAN user terminal performs PPPoE dialing, sends PPPoE discovery initialization negotiation packet, and starts negotiation in PPPoE discovery phase; after receiving it, APGW sends PPPoE discovery Provide a negotiation packet to the terminal; after the terminal receives it, it sends a PPPoE discovery negotiation request packet to the APGW; after receiving it, the APGW sends an RP connection establishment request packet to the PDSN, and starts the negotiation of the RP connection between the APGW and the PDSN; after the PDSN receives the RP , allow the connection to be established, and send the RP connection establishment response packet to the APGW; APGW accepts the RP connection establishment response, the RP connection between the APGW and the PDSN is successfully established, and the APGW sends the PPPoE discovery session confirmation packet to the terminal; after the terminal receives it, the PPPoE discovery phase The negotiation is completed; the negotiation of the PPPoE session phase between the terminal and the PDSN is started; after the negotiation of the PPPoE session phase is successfully completed, the data transmission between the terminal and the PDSN is started. The invention conveniently realizes the access of the WLAN user terminal to the CDMA system.

Description

A user access method realizing the combination of code division multiple access system and wireless local area network

technical field

The invention relates to a user access method of a communication system, in particular to a user access method combining a CDMA system and a wireless local area network.

Background technique

Code Division Multiple Access (CDMA for short) is a commonly used multiple access modulation technology based on wideband spread spectrum technology. The CDMA2000 1X system follows the IS-2000 standard and is the first stage of the development of CDMA2000 cellular mobile communication technology, which can provide a packet data transmission rate of 153.6Kbps.

Outside the dotted line frame in Fig. 1 is the function node of existing CDMA2000 1X system, and wherein wireless transceiver 11 (BTS) establishes wireless coverage area for mobile user terminal communication in the subdistrict, and base station controller (BSC) can carry out each BTS Control: Packet Control Function Node 12 (PCF), used to forward messages between the wireless subsystem and Packet Data Serving Node 14 (PDSN). The packet data service node is the interface module for CDMA2000 1X to access the Internet. The standard R-P interface standard (Radio-Packet, R-P for short) is used between the packet data service node and the packet control function node (PCF), that is, the A10/A11 interface, where A10 is the data channel and A11 is the control channel. The packet data service node provides access services for CDMA2000 1X users, and the users go to the visiting, intermediate and home authentication, authorization and charging servers 19, 17, 18 through the PDSN for authentication and charging.

When a user requests a packet data service, at first the mobile switching center 13 goes to the home location register 20 (HLR) to carry out the legality identification of the user identity; after the legality identification is passed, an A8/A9 is established between the base station controller (BSC) and the PCF After that, the PCF sends a message to the PDSN, and an R-P connection is established between the PCF and the PDSN. Then, a PPP connection is established between the mobile user terminal and the PDSN. The PPP connection is successfully established, and if it is a Simple IP user, the data service can be started. For MobileIP users, MIP registration is required, and if the registration is successful, the mobile IP data service starts. When a user accesses, a complete PPP negotiation process must be performed with the PDSN. PPP adopts the framing mode of asynchronous HDLC.

Wireless Local Area Network (Wireless Local Area Net, referred to as WLAN) is the product of the combination of computer network and wireless communication technology. User terminal dialing usually adopts PPPoE (Point to Point Protocol over Ethernet, point-to-point protocol based on Ethernet) or Web+DHCP (Dyamic Host Configuration Protocol, dynamic host configuration protocol).

Compared with wired network, WLAN has the following advantages: easy installation, flexible use, economical and economical, easy to expand, etc. Due to its irreplaceable advantages, WLAN is rapidly applied to occasions that require networking and roaming between networks, especially in places where wiring is not easy and for long-distance data processing. Especially in some industries, such as exhibitions, conferences, tourism services, financial services, mobile office systems, etc., WLAN has great opportunities for development. The wireless local area network is characterized by low price, flexible networking, easy installation, and high-speed access to wireless data. It is suitable for applications in hot spots such as airports and hotels.

In the wireless local area network, the wireless user terminal is connected to the fixed telecommunication network through the access point (AP). The AP provides the wireless access function for the user, can provide voice and data access services, and complete the conversion of the 802.11 and 802.3 protocols. The data packets converted by the AP are Ethernet data packets.

However, the WLAN provides limited authentication and billing mechanisms for user terminal access. It can only provide authentication at the physical transport layer, and cannot provide a billing mechanism for user terminals. Therefore, it cannot meet the needs of carrier-level applications. Moreover, its coverage is limited to hotspot areas, which greatly restricts the wide application of WLAN.

After nearly 20 years of development of the CDMA system, CDMA2000 1X has been commercialized on a large scale. Not only its authentication and billing mechanisms are relatively mature and perfect, but also its coverage is ubiquitous; but due to bandwidth limitations, CDMA2000 1X The ability of the system to provide high-speed access services for end users is limited. Therefore, the organic combination of the two systems can give full play to their respective advantages.

The way for WLAN user terminals to access the CDMA system is one of the main technical issues to realize the combination of WLAN and CDMA. An access method with reasonable functions and convenient implementation will create favorable conditions for the popularization and application of CDMA and wireless local area network fusion solutions.

How to make wireless local area network users access to CDMA2000 1X network, and organically combine with the access mode of CDMA2000 1X users, to provide unified access services for users and end users of the two networks, no relevant public documents have been retrieved so far.

Contents of the invention

The technical problem to be solved by the present invention is to provide a convenient user access method that realizes the combination of the CDMA system and the wireless local area network.

The system based on the present invention includes the original functional nodes of the CDMA system and the functional nodes added after the CDMA system integrates the wireless local area network function, and the functional nodes include: packet data service nodes, authentication, authorization and billing servers; access points , wireless access point gateway, etc.

Technical scheme of the present invention is as follows:

Step 1: The wireless LAN user terminal performs PPPoE (PPP over Ethernet, point-to-point protocol on Ethernet) dial-up, sends a PPPoE discovery initialization negotiation packet to the wireless access point gateway, and starts the negotiation of the PPPoE discovery stage;

Step 2: After the wireless access point gateway receives the PPPoE discovery initialization negotiation packet, it judges whether to allow the user to access, and if allowed, then sends the PPPoE discovery provision negotiation packet to the wireless LAN user terminal;

Step 3: After receiving the PPPoE discovery negotiation packet, the wireless LAN user terminal sends a PPPoE discovery negotiation request packet to the wireless access point gateway;

Step 4: The wireless access point gateway receives the PPPoE discovery negotiation request packet, sends an R-P (Radio-Packet, wireless packet interface) connection establishment request packet to the packet data service node, and starts the communication between the wireless access point gateway and the packet data service node Inter-R-P connection negotiation;

Step 5: The packet data service node receives the R-P connection establishment request, allows the connection establishment, and sends the R-P connection establishment response packet to the wireless access point gateway;

Step 6: The wireless access point gateway accepts the R-P connection establishment response, the R-P connection between the wireless access point gateway and the packet data service node is successfully established, and the wireless access point gateway will send a PPPoE discovery session confirmation packet to the wireless LAN user terminal;

Step 7: the wireless local area network user terminal accepts the PPPoE discovery session confirmation packet, and the PPPoE discovery stage negotiation is completed; start the negotiation of the PPPoE session stage between the wireless local area network user terminal and the packet data service node;

Step 8: After the negotiation of the PPPoE session phase is successfully completed, the data transmission between the WLAN user terminal and the packet data service node can be started.

In the steps of the access method above:

The wireless local area network user terminal can be a pure wireless local area network user terminal or a dual-mode user terminal with both wireless local area network and CDMA2000 1X functions.

The interface between the wireless access point gateway and the packet data service node is in the form of a standard R-P interface, that is, the A10/A11 message; for the characteristics of the wireless local area network, the IMSI (International Mobile Subscriber Identity Number) information in the A11 message will be determined by The MAC address information of the wireless LAN user is replaced; the protocol field in the A10/A11 message will take a different value from the protocol field of the CDMA2000 1X user, so that the packet data serving node can distinguish between the wireless LAN user and the CDMA2000 1X user.

In the process of PPPoE negotiation and data transmission after the negotiation is completed, the transmission between the wireless LAN user terminal and the wireless access point gateway is PPPoE packets, and the transmission between the wireless access point gateway and the packet data service node is tunnel encapsulation (such as GRE: Generic Routing Encapsulation, general routing encapsulation) PPP packets.

For the forward data flow (the data flow transmitted from the wireless LAN to the CDMA system), the wireless access point gateway strips the PPPoE header from the PPPoE packet transmitted by the wireless LAN user terminal, and then encapsulates it as a tunnel data packet and sends it to the packet data service node; for Reverse data flow (the data flow transmitted from the CDMA system to the wireless LAN), the packet data service node encapsulates the data packet transmitted to the wireless LAN user terminal into a tunnel data packet and sends it to the wireless access point gateway, and the wireless access point gateway Then strip the GRE header off the packet, encapsulate the PPPoE header, and finally send it to the wireless LAN user terminal.

When a WLAN user accesses the CDMA network, the packet data service node will go to the authentication, authorization and accounting server to authenticate the user; if the authentication is successful, the authentication, authorization and accounting server will judge the user name Whether the user has CDMA2000 1X information at the same time; if yes, the authentication, authorization and billing server will return the user's IMSI to the packet data service node, and the packet data service node will consider this user to have the CDMA2000 1X access function at the same time after obtaining this information ; Otherwise, this user will be considered as a pure WLAN user.

When a CDMA2000 1X user accesses a CDMA network, if the user also has the information of a wireless LAN user, the authentication, authorization and accounting server will return this attribute to the packet data service node, and the packet data service node will consider this information as This user also has the function of wireless LAN access, otherwise this user will be considered as a pure CDMA2000 1X user.

When the user switches between the WLAN and the CDMA network, the packet data service node will judge whether the user is a handover user (that is, whether the user has already used a method to access the CDMA network, and the user has both WLAN and CDMA2000 1X access function). If yes, then carry out the processing of handover user: the corresponding wireless local area network user and the data area of CDMA2000 1X user, copy some valid data of the user to the data area after handover, make this user have common feature (as consistent) before and after handover IP address, etc.), otherwise the user will access as a pure wireless LAN user or a CDMA2000 1X user.

The functional node also includes a home agent, and the packet data service node cooperates with the home agent to not only realize the access of the CDMA2000 1X user's mobile IP, but also realize the access service of the wireless local area network user's mobile IP.

In summary, the present invention provides a mobile user terminal access method based on the combination of CDMA and wireless local area network, so that it can combine the wide coverage of CDMA network and perfect authentication, billing mechanism and high bandwidth advantages of wireless local area network to solve the problem of wireless network access. The access management of LAN users and terminal users provides the basis for unified user management and handover and roaming between CDMA and wireless LAN.

Description of drawings

Figure 1 is a schematic diagram of the network structure combining CDMA2000 1X and wireless local area network.

Fig. 2 is a schematic flow diagram of the wireless local area network user accessing the CDMA2000 1X network of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

The system model of the combination of CDMA and WLAN corresponding to the present invention is as shown in Figure 1: outside the dotted line frame is the original function node of the CDMA2000 1X system. The dotted box is the function node added after the CDMA2000 1X system integrates the wireless LAN function. in:

Wireless transceiver 11 (BTS): establish a wireless coverage area in the cell for mobile user terminal communication, and the base station controller (BSC) can control each BTS.

Packet Control Function Node 12 (PCF): Used to realize the connection between the air wireless interface and the Packet Data Serving Node 14 (PDSN), and cooperate to complete the access of CDMA2000 1X users.

Packet data service node 14: in addition to completing the existing functions of the CDMA2000 1X network, it should also complete the management of wireless local area network users accessed through the wireless access point gateway 15; and authentication, authorization and billing servers 17, 18, 19 Cooperate to complete the authentication and billing of wireless LAN users; complete the forwarding of media streams of wireless LAN users. The original packet data service node provides access services for CDMA2000 1X data users. In the present invention, the packet data service node increases the access processing of the wireless local area network user terminal users for the characteristics of the wireless local area network user terminal users.

Intermediate, home and visit authentication, authorization and billing servers 17, 18, 19: authenticate CDMA2000 1X or wireless LAN users for packet data calls, judge the legitimacy of users, and realize the authentication of CDMA2000 1X users and wireless LAN users Unified authorization (that is: when a CDMA2000 1X user is authenticated, if the user has a wireless LAN access function at the same time, the packet data service node 14 will return the access feature of the user's wireless LAN; when the wireless local area network user is authenticated, if the user Have CDMA2000 1X access function simultaneously, will return the IMSI information of this user to packet data service node 14); Complete the billing function of packet data call. The original authentication, authorization and billing server provides authentication, authorization and billing services for CDMA data users. In the present invention, the authentication, authorization and billing server increases the authentication of wireless local area network users according to the characteristics of wireless local area network users. , Authorization and billing and the processing of two unified user identification.

Access point 16 (Access Point, referred to as AP): As a connection device for wireless LAN user terminals to access the fixed telecommunication network, it provides users with wireless access functions, and can provide voice and data access services; realize wireless LAN signal conversion into the signal transmitted by the wired network, and complete the simple management of wireless users and the dynamic allocation of wireless channels.

Wireless access point gateway 15 (Access Point Gateway, referred to as APGW): the main function is to realize the three-layer tunnel encapsulation and decapsulation of the media stream of the wireless LAN user terminal according to the user, and send the data of the wireless LAN user to the packet data service node 14, or The data sent by the packet data service node 14 is forwarded to the wireless local area network users.

Functions of other system units such as mobile switching center/visitor location register 13, home location register 20, Internet, home agent, etc. are well known in the industry and will not be repeated here.

Fig. 2 is the schematic flow chart that wireless local area network user of the present invention inserts to CDMA2000 1X network, and access step is as follows:

201: The mobile user terminal (wireless local area network user terminal) accesses the wireless local area network through the access point 16;

202: The mobile user terminal performs PPPoE dialing, sends a PPPoE discovery initialization negotiation packet, and searches for a service provider;

203: The wireless access point gateway 15 receives the PPPoE discovery initialization negotiation packet, allows the mobile user terminal to access, and sends the PPPoE discovery provision packet to the mobile user terminal;

204: The mobile user terminal accepts the PPPoE discovery providing packet, finds the service provider, and sends the PPPoE discovery request negotiation packet to the wireless access point gateway 15;

205: The wireless access point gateway 15 accepts the request, sends an R-P connection establishment request to the packet data service node 14, and requests to establish an R-P connection with the packet data service node 14;

206: The packet data service node 14 receives the R-P connection establishment request, allows the mobile user terminal to access, and sends an R-P connection establishment response to the wireless access point gateway 15;

207: The wireless access point gateway 15 accepts the R-P connection establishment response packet sent by the packet data service node 14. At this time, the tunnel between the wireless access point gateway 15 and the packet data service node 14 for the mobile user terminal is successfully established, and the wireless access point The point gateway 15 sends the PPPoE discovery session confirmation packet to the mobile user terminal;

208: The mobile user terminal accepts the PPPoE discovery session confirmation packet, and the PPPoE discovery phase negotiation with the wireless access point gateway 15 is completed, and the mobile user terminal starts to perform the PPPoE session phase negotiation with the packet data serving node 14;

209 : The PPPoE session phase negotiation is successful, and data transmission can be performed between the mobile user terminal and the packet data service node 14 through the wireless access point gateway 15 .

In summary, on the basis of the combination of the CDMA2000 1X system and the wireless local area network system, the present invention proposes a solution to the access mode of the wireless local area network user terminal, so that the wireless local area network user or the dual-mode user of the wireless local area network and the CDMA2000 1X can pass through The wireless local area network is connected to the CDMA system. The standard R-P interface is used between the wireless access point gateway and the packet data service node, which is similar to the interface between the packet control function node and the packet data service node, which facilitates the unification of the packet data service node for wireless LAN users and CDMA2000 1X users manage. With the cooperation of authentication, authorization and billing servers, the packet data service node can identify whether the currently accessing user is a switching user, and make corresponding processing, which provides a basis for switching between CDMA2000 1X and wireless LAN .

The above-mentioned method for wireless LAN user terminals to access the CDMA system is not only applicable to the CDMA2000 1X system, but also suitable for the access method combining 1x EV-DO, 1x EV-DV and wireless LAN.

The above-mentioned tunnel encapsulation of data packets between the wireless access point gateway and the packet data service node can not only adopt general routing encapsulation (ie GRE), but also other tunnel encapsulation forms such as IP in IP and minimal encapsulation.

Claims (9)

1. A user access method that realizes the combination of a code division multiple access system and a wireless local area network, the system based on which the system is based includes the original functional nodes of the CDMA system and the functional nodes added after the CDMA system integrates the wireless local area network function, and the functional nodes include : packet data service node, authentication, authorization and billing server; access point, wireless access point gateway, etc.; the method includes the following steps: Step 1: The wireless LAN user terminal performs PPPoE, that is, point-to-point protocol dialing on Ethernet, sends a PPPoE discovery initialization negotiation packet to the wireless access point gateway, and starts the negotiation of the PPPoE discovery stage; Step 2: After the wireless access point gateway receives the PPPoE discovery initialization negotiation packet, it judges whether to allow the user to access, if allowed, then sends the PPPoE discovery provision negotiation packet to the wireless LAN user terminal; Step 3: After receiving the PPPoE discovery negotiation packet, the wireless LAN user terminal sends a PPPoE discovery negotiation request packet to the wireless access point gateway; Step 4: The wireless access point gateway receives the PPPoE discovery negotiation request packet, sends the R-P connection establishment request packet to the packet data service node, and starts the negotiation of the R-P connection between the wireless access point gateway and the packet data service node; Step 5: The packet data service node receives the R-P connection establishment request packet, allows the connection establishment, and sends the R-P connection establishment response packet to the wireless access point gateway; Step 6: The wireless access point gateway accepts the R-P connection establishment response, the R-P connection between the wireless access point gateway and the packet data service node is successfully established, and the wireless access point gateway sends a PPPoE discovery session confirmation packet to the wireless LAN user terminal; Step 7: the wireless local area network user terminal receives the PPPoE discovery session confirmation packet, and the PPPoE discovery phase negotiation is completed; start the negotiation of the PPPoE session phase between the wireless local area network user terminal and the packet data service node; Step 8: After the negotiation of the PPPoE session phase is successfully completed, the data transmission between the wireless local area network user terminal and the packet data service node starts. 2. The user access method for realizing the combination of code division multiple access system and wireless local area network as claimed in claim 1, characterized in that: the wireless local area network user terminal can be a simple wireless local area network user terminal or have both wireless local area network and CDMA2000 Dual-mode user terminal with 1X function. 3. The user access method for realizing the combination of code division multiple access system and wireless local area network as claimed in claim 1, characterized in that: the interface between the wireless access point gateway and the packet data service node is in the form of a standard R-P interface , that is, the A10/A11 message; for the characteristics of the wireless LAN, the IMSI information in the A11 message will be replaced by the MAC address information of the wireless LAN user; the protocol field in the A10/A11 message will be different from the protocol field of the CDMA2000 1X user value, so that the packet data serving node can distinguish WLAN users from CDMA2000 1X users. 4. The user access method for realizing the combination of code division multiple access system and wireless local area network as claimed in claim 1, characterized in that: in the process of PPPoE negotiation and data transmission after the negotiation is completed, the wireless local area network user terminal to the wireless access PPPoE packets are transmitted between point gateways, and tunnel-encapsulated PPP packets are transmitted between wireless access point gateways and packet data service nodes. 5. The user access method for realizing the combination of code division multiple access system and wireless local area network as claimed in claim 4, characterized in that: for the forward data flow, the wireless access point gateway strips the PPPoE packet transmitted by the wireless local area network user terminal Remove the PPPoE header, then encapsulate it as a tunnel data packet and send it to the packet data service node; for the reverse data flow, the packet data service node encapsulates the data packet transmitted to the wireless LAN user terminal into a tunnel data packet and sends it to the wireless access point The gateway, the wireless access point gateway strips the GRE header off the packet, encapsulates the PPPoE header, and finally sends it to the wireless LAN user terminal. 6. The user access method for realizing the combination of code division multiple access system and wireless local area network as claimed in claim 1, characterized in that: when the wireless local area network user accesses the CDMA network, the packet data service node will go to authentication and authorization This user is authenticated with the billing server; if the authentication is successful, the authentication, authorization and billing server judges whether the user has CDMA2000 1X information at the same time according to the username; if so, the authentication, authorization and billing server will The user's IMSI is returned to the packet data service node, and the packet data service node will think that the user has the CDMA2000 1X access function at the same time when the packet data service node gets this information; otherwise, the user will be regarded as a pure wireless LAN user. 7. The user access method for realizing the combination of code division multiple access system and wireless local area network as claimed in claim 1, characterized in that: when a CDMA2000 1X user accesses the CDMA network, if the user has the information of the wireless local area network user simultaneously, The authentication, authorization and accounting server will return this attribute to the packet data service node, and the packet data service node will think that the user has the function of wireless LAN access at the same time, otherwise the user will be regarded as a pure CDMA2000 1X user. 8. The user access method for realizing the combination of code division multiple access system and wireless local area network as claimed in claim 1, characterized in that: when the user switches between the wireless local area network and the CDMA network, the packet data service node will judge whether the user is Switch the user; if so, then carry out the processing of switching the user: corresponding to the data area of the wireless local area network user and the CDMA2000 1X user, copy some valid data of the user to the data area after switching, so that this user has common characteristics before and after switching, Otherwise, the user will access as a pure wireless LAN user or a CDMA2000 1X user. 9. The user access method for realizing the combination of code division multiple access system and wireless local area network as claimed in claim 1, characterized in that: the functional node also includes a home agent, and the packet data service node cooperates with the home agent to not only realize CDMA2000 1X user mobile IP access can also realize wireless LAN user mobile IP access service.

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