CN1479494A - System of interconnecting CDMA system and radiolocal network - Google Patents
System of interconnecting CDMA system and radiolocal network Download PDFInfo
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Abstract
The access system is based on combination of CDMA system and WLAN. The system includes CDMA network, wireless access point of wireless local area network, and AP access network gateway. CDMA network is composed of station transceiver, base station controller, packet data service node, server of validation authentication and charge, attribution proxy server, mobile switching center/call on location register, and attribution location register. AP access network gateway connected to wireless access point is utilized to package wireless terminal services in tunnel type according to users, making service stream pass though IP network to reach PDSN. The packet data service node includes access process unit for WLAN users in terminals, which is connected to CDMA user access unit, user data and RADIUS interface respectively. The invention possesses features of low cost, easy of building network and combination of wide coverage of CDMA-1x system and high bandwidth of WLAN.
Description
Technical field
The present invention relates to a kind ofly be combined into the solution that the mobile subscriber provides the packet domain access service by wireless lan (wlan) and cdma network.
Background technology
WLAN (wireless local area network) (Wireless LAN is hereinafter to be referred as WLAN) is the product that computer network combines with wireless communication technology.That the characteristics of WLAN are is cheap, networking flexibility, the support wireless data inserts at a high speed and open frequency range, is suitable for the application of hot zones such as airport, hotel.But WLAN can not provide access service to terminal, and authentication and charging to terminal can not be provided, and also just can not provide user's access service and management; And cdma network has the characteristics of wide covering, and its authenticating and charging mechanism is more perfect, but because bandwidth constraints, for the terminal use provides the limited in one's ability of high speed access service.If can adopt the WLAN networking that combines with CDMA,, will attract high-end user and extend volume growth good competitiveness will be provided for mobile operator undoubtedly in conjunction with two kinds of network advantages.
WLAN provides a kind of connected mode of physical link flexibly, how to utilize user's access service mechanism of cdma network, utilize network configuration and the functional entity of CDMA, reasonably define and realize each functions entity, form the combination of WLAN access way and cdma network, need to solve a lot of problems, rather than simple superposition; Such as when business provides (for example prepayment service etc.), requirement need not consider that the logical distinction of WLAN and two kinds of access way network configurations of cdma-1x just can provide access service, and this is the technical problem that must solve.
Do not retrieve at present open source literature as yet about the problems referred to above solution.
Summary of the invention
The technical problem to be solved in the present invention is to propose the connecting system that a kind of cdma system combines with WLAN (wireless local area network) WLAN, make it in conjunction with the perfect access service of cdma network, user management, extensively to cover and two kinds of advantages of WLAN high bandwidth, make WLAN user can in cdma network, carry out carrier class and use.
1, technical scheme of the present invention is as follows, and the system that a kind of cdma system combines with WLAN (wireless local area network) comprises cdma network and wlan network; In the described cdma network:
Base station BTS is the wireless portion of base station system, realizes carrying out wireless transmission and relevant controlled function by air interface between BTS and the travelling carriage;
Base station controller BSC/PCF, switching, the realization speech coding of travelling carriage finished in responsible wireless network management, RRM, maintenance management, call treatment, control;
Packet data serving node PDSN/FA: except that the existing function of finishing the cdma-1x network, also should finish the user management of the wireless terminal that inserts by AP; With AAA, network entities such as home agent server HA cooperate authentication, the charging of finishing the user, finish the forwarding of Media Stream;
Authentication, authorize accounting server AAA, the packet data call user is carried out authentication, judgement user's legitimacy; Finish the packet data call billing function, be that the CDMA data user provides authentication, the service of authorizing, account; Also, increase WLAN terminal use's authentication, the processing of authorizing, account at WLAN terminal use's characteristics;
Home agent server HA when travelling carriage uses mobile IP to serve, is used to safeguard the positional information of travelling carriage;
Mobile switching center MSC/VLR is used for the user's access service and the circuit connection of cdma network circuit domain, and dynamic subscriber's information management and business provide etc.;
Attaching position register HLR, storing the information such as positional information, business datum, account management of all mobile subscribers in the fixed area, and can provide inquiry and modification in real time to customer position information, and realize a series of business operations, comprise position renewal, call treatment, authentication, supplementary service etc., finish user mobility management in the mobile radio communication;
In the described wlan network, comprise wireless access point AP, be used for wireless terminal, insert the connection device of telecommunications network,, can provide the access service of speech and data for the user provides wireless access function;
It is characterized in that:
Also comprise the AP IAD APGW that is connected with wireless access point AP, be used for the Business Stream of wireless terminal is carried out tunnel encapsulation by the user, make Business Stream can pass through IP network and arrive PDSN;
Among the described packet data serving node PDSN/FA, also comprise WLAN terminal use's access processing unit, link to each other with CDMA user's access unit, user data area, RADIUS interface respectively.
Aforesaid system is characterized in that: described WLAN terminal use's access processing unit comprises: PPPoE inserts processing unit, and DHCP inserts processing unit.
Aforesaid system is characterized in that: AP and APGW interface adopt 802.3 protocol processes, and the user traffic flow of interface keeps MAC Address, and customer identification informations such as NAI make this information can pass to PDSN, and identifying user is in order to provide access service.
Aforesaid system is characterized in that: the storing point of APGW makes and is convenient to use the existing transmission network of operator between AP and PDSN near AP.
Aforesaid system is characterized in that: described Business Stream with wireless terminal carries out tunnel encapsulation by the user, comprises the tunnel encapsulation that adopts GRE, and terminal adopts the access way of PPPOE, and its Service stream formats is:
| ????PPPOE |
| ????GRE |
| ????IP |
| ????Physical?Link |
Increase the protocol type definition of PPPOE in the gre tunneling encapsulation.
Aforesaid system is characterized in that: also comprise the terminal equipment of access network, described terminal equipment is:
Insert the terminal equipment of cdma-1x network;
Support the terminal equipment of 802.1x agreement;
Support to insert the dual-mode terminal of cdma-1x network and 802.1x agreement.
What the present invention proposed provides the system of access service based on WLAN+cdma-1x, the advantage separately of two networks can be combined, new functional entity APGW has particularly been proposed, the Business Stream of terminal is carried out tunnel encapsulation (GRE, IP in IP etc.) by the user, make Business Stream can pass through IP network and arrive PDSN.The network coverage mode of the clear and definite two kinds of physics access waies of the present invention; The functional entity that the function that clear and definite authentication charges distributes and participates in; By system of the present invention, can solve and switch the roaming problem.
Adopt the present invention, on the basis of charging, authentication and the access means of cdma network maturation, enrich and revise, overcome WLAN itself defective to user access administration can not be provided, the characteristics of wide covering of cdma-1x system and WLAN high bandwidth have been brought into play, WLAN access way and cdma network are organically combined, in network to terminal use's unified management of WLAN access way and CDMA access way, provide feasible solution for operator realizes WLAN carrier class application in cdma network, had very vast market prospect.
Description of drawings
Fig. 1 utilizes the present invention to adopt combine with the CDMA basic scheme of networking of WLAN.
Fig. 2 is the functional structure chart of PDSN among Fig. 1.
Fig. 3 is the composition that WLAN inserts processing unit among Fig. 2.
Fig. 4 is the functional structure of PPPOE/PPP module among Fig. 3.
Embodiment
Fig. 1 is the system scheme that two networks of WLAN+CDMA combine.Among Fig. 1, as can be seen, be divided into three parts basically, CDMA visit access network, WLAN visit access network, home network, wherein, AP IAD APGW realizes having undefined functional entity in the standard criterion for the functional entity of the present invention in order to make that two net combinations are proposed.APGW major function: the Business Stream of wireless terminal is carried out tunnel encapsulation (GRE, IP in IP etc.) by the user, make Business Stream can pass through IP network and arrive PDSN.Consider the flexibility of native system networking plan, the storing point of APGW makes and is convenient to use the existing transmission network of operator between AP and PDSN near AP.
1) AP and APGW interface
Interface is 802.3 agreements, and among the present invention, the user traffic flow of interface keeps customer identification information (MAC Address, NAI etc.), makes this information can pass to PDSN, and identifying user is in order to provide access service.
2) APGW and PDSN interface
For example
Receive the end-user service stream of AP forwarding as APGW after,, judge whether the user exists according to user's MAC Address.
If the user does not exist, give user's allocation index GRE-KEY, set up the corresponding relation of MAC Address and GRE-KEY, user data package is carried out the gre tunneling encapsulation, mail to corresponding PDSN.
If the user is an active user, according to MAC Address inquiring user data field, user data package is carried out tunnel encapsulation, mail to corresponding PDSN.
Be example with Fig. 1 below, describe the effect of system of the present invention in detail.
The present invention has solved network coverage problem preferably, and among Fig. 1, the area of coverage of AP mainly concentrates on hot zones such as airport, star hotel among the WLAN, and its area of coverage is discontinuous.Cover service area by BTS in the cdma network, its wide covering just in time remedies this shortcoming.At the express network of hot zones use AP, use the wide overlay network of CDMA in common area.
Authentication is to solve the right subject matter of carrier class application surface.In the present invention, the user of WLAN access way, HLR do not participate in its authentication, and its authentication process is cooperated with aaa server by PDSN carries out.Handle like this, can make network configuration simple, avoid functional redundancy, the authenticating and charging that can support also can expand to the authentication based on IMSI or NAI not only based on IMSI; The existing method for authenticating of aaa server and PDSN replenishes the subscription authentication that can support the WLAN access way through revision.
It is to be noted that the visit aaa server incorporates visited network among Fig. 1, relaying aaa server and ownership aaa server incorporate home network into, are actually same physical entity.
In the cdma-1x network, the authentication of Packet data service is divided into HLR and two parts of AAA, cooperates the HLR authentication by the MSC/VLR among Fig. 1 respectively, and PDSN cooperates the aaa server authentication.The purpose of HLR authentication is the authenticated user legitimacy, distributes wireless channel to validated user during with the assurance Packet Service, guarantees the reasonable use of Radio Resource.The data user of cdma-1x, the validated user of process HLR authentication also need pass through the AAA authentication, with the legitimacy of authenticated user in packet domain after having distributed wireless channel.
When the terminal use was movable in WLAN coverage, the authentication of AAA can guarantee terminal use's legitimacy, because the terminal equipment that uses among the WLAN does not take the radio channel resource of cdma-1x, the authentication among the HLR is unnecessary.Different with the authentication mode of original cdma-1x network, adopt AAA and PDSN authentication in the present invention, the participation that authentication process need not HLR by radius protocol.
And, carry out authentication by radius protocol by AAA and PDSN in packet domain.At present the authentication mode that provides of PDSN has following based on two kinds of NAI (network user identifier) and MSID (mobile subscriber's identification).Wherein based on NAI be list below the 1st, 2 two kind, based on MSID is the 3rd kind.
1. username-password: terminal is used the PAP authentication, and the user name and password is sent to PDSN, and PDSN sends authentication request to RADIUS, if radius protocol allows to insert, then enters corresponding mandate.Otherwise send the authentication refuse information to PDSN, the PDSN termination is connected with terminal.
2. challenge authentication: PDSN challenges and an ID value to terminal, and the user goes out response according to corresponding challenge, ID value and the local cryptographic calculations of depositing, and response is sent back to PDSN.Then, PDSN sends authentication request (comprising challenge, response and ID value) to RADIUS, RADIUS is according to challenge and ID value and the cryptographic calculations response corresponding to this user self deposited, if the response that response and terminal are calculated is identical, then passes through mandate accordingly.Otherwise send the authentication refuse information to PDSN, the PDSN termination is connected with terminal.
3. when terminal was not taken NAI information to PDSN, PDSN can construct NAI according to MSID and carry out corresponding authentication.
Therefore, the authentication functions that AAA cooperates with PDSN is very perfect, also can carry out reliable authentication in the presence that does not have HLR.
The present invention is described as follows for the management of chargeing: in the cdma-1x network, the charging content of packet domain is divided into two parts: air traffic channel is chargeed partly and network side charging part.Air traffic channel is chargeed and is partly sent to PDSN by the PCF collecting charging information, and the network side charge information is collected by PDSN, and PDSN compiles the charge information and the network side charge information of air traffic channel, sends to aaa server by radius protocol then and charges.
In the present invention, the charging to the WLAN access way has increased new processing.The charge information of wireless side is gathered by APGW and is sent to PDSN, and the charge information by PDSN gathers wireless access side network side sends to radius server then and charges.Among the present invention, PDSN has increased processing to the NAI access way to the charging of network side, to customer charging information index not only be confined to IMSI, the user that WLAN is inserted increases the indexed mode of NAI.
Fig. 2 is the functional structure of PDSN among the present invention.Among the present invention, the terminal access mode of system's support has: (1) PPPOE, (2) web+DHCP mode.(3) existing P PP over HDLC mode in the cdma-1x network.
For supporting the processing of these access waies, Fig. 2 has provided the functional structure of PDSN.Among the PDSN, comprise that WLAN user inserts processing unit, cdma-1x user inserts processing unit, user data area administrative unit, RADIUS interface unit, data forwarding processing unit.
WLAN user inserts processing unit and finishes PPPOE, the access of DHCP is handled, and finishes the coordination that inserts processing unit with cdma-1x user, shielding WLAN user and cdma-1x user's difference, so that utilize the aaa server of cdma network, HA finishes user's access service and data forwarding.
The data forwarding of the Business Stream of cdma-1x user PPP over HDLC is finished in the data forwarding unit, finishes WLAN user's PPPOE, the data forwarding of DHCP Business Stream.
The RADIU interface unit is finished authenticating and charging processing between two kinds of different access way users, shields the difference between two kinds of different access way users.
The user data area administrative unit is finished the record of user data, realizes access service and hand-off process to cooperate.
(1)PPPOE
Because the PDSN equipment in the existing cdma-1x network is not supported the processing of PPPOE.So the present invention increases the processing module of PPPOE/PPP at PDSN.The PPPoE/PPP module is in link layer in protocol model, with network layer and physical layer interface, in whole protocol stack, be responsible for handling PPPoE and ppp protocol, finish the negotiation of ppp link on Ethernet between dialing computer and the access server, set up, be responsible for the authentication of user identity, distributing IP address and dns address generate the record keeping message, and while coupled system after link establishment is finished is finished the forwarding of packet.
PPPOE realizes the function of server side among the rfc2516, finishes the negotiation of PPPOE session, and control and data forwarding are for the transmission of PPP on Ethernet provides carrying.
PPP realizes rfc1661 and related protocol, sets up the transmission channel of point-to-point at user and access server, cooperates with Radius and finishes authentification of user.
The oam interface is provided.
For carrying out data forwarding, equipment develops and manages corresponding data field.
Fig. 3 is that the PPPOE in WLAN user's access unit inserts the processing section among Fig. 2.The PPPOE/PPP module comprises nine submodule: PPPOE according to function, and the PPP interface is handled, and LCP handles, and IPCP handles, and CHAP handles, and PAP handles, the Radius interface, and OAM interface and data forwarding interface are handled (not drawing) in Fig. 3.Among Fig. 3, the data forwarding interface is in the bottom, for PPPOE provides interface; PPPOE handles and the PPP Processing Interface; PPP handles and LCP, IPCP, and CHAP, Radius handles interrelated; The OAM interface is finished the Operation and Maintenance of equipment, handles mutual communication with each.
As in terminal one side, the dial mode of PPPOE is very universal, the processing of terminal one side, and the present invention does not do elaboration.
(2) web+DHCP mode
PDSN equipment in the existing cdma-1x network is not supported the processing of web+DHCP.Among the present invention, increase the processing module of web+DHCP at PDSN.Fig. 4 is the structure chart of DHCP server, and the DHCP in the corresponding diagram 2 in WLAN user's access unit inserts the processing section, and Dynamic Host Configuration Protocol server provides user's dynamic IP addressing to distribute.
In terminal one side, the dial mode of web+DHCP is a common mode equally, the processing of terminal one side, and the present invention does not do elaboration.
Support terminal user's of the present invention switching roaming.In the present invention, the user's of the user of WLAN access way and CDMA access way otherness is finished conversion and coordination by PDSN and APGW.The management of user property comes unified management by the aaa server in the cdma network, authentication charges and is undertaken by PDSN, aaa server unification, the roaming of CDMA terminal under this programme undertaken by original mechanism, and the terminal that alternate manner inserts utilizes the existing mechanism of cdma network to realize roaming.
Switch to have and distinguish interior the switching and several situations of interval switching:
1. in WLAN coverage, switch
2. in the CDMA area of coverage, switch
3. switch to the CDMA area of coverage from WLAN coverage.
4. switch to WLAN coverage from the CDMA area of coverage.
Switching in the area of coverage of 1,2 two kind of situation is undertaken by original mechanism separately.
For above-mentioned the 3rd kind of switching mode, from the switching of WLAN coverage to the CDMA area of coverage, switching target district (the CDMA area of coverage) user's access way by as figure l in the cdma-1x network flow process of R-P interface regulation carry out; PDSN finishes handed over service district (WLAN coverage) and handles with the mapping in switching target district (the CDMA area of coverage);
For above-mentioned the 4th kind of switching mode,, undertaken by the flow process of PPPOE regulation in switching target district (WLAN coverage) user's access way from of the switching of the CDMA area of coverage to WLAN coverage; PDSN finishes handed over service district (the CDMA area of coverage) and handles with the mapping in switching target district (WLAN coverage);
According to the switching interface of the present invention regulation, switching problem is separately converted to the hand-off process of inside of terminal and the inter-process that PDSN switches, and has not been the network configuration problem, and system of the present invention can support the hand-off process between the WLAN coverage and the CDMA area of coverage.Abbreviation
| Title | Full name | Explain |
| AAA | ?Aumentication，authorization，account | Authentication, mandate, charging |
| CDMA | ?Code?division?multiple?access | Code division multiple access |
| CHAP | ?Check?hand?Authentication?protocol | Inquire about the authentication protocol of shaking hands |
| FA | ?Foreign?agent | Foreign Agent |
| HA | ?Home?agent | Home agent |
| HLR | ?Home?location?register | Attaching position register |
| MSC | ?Mobile?switch?center | Mobile switching centre |
| NAI | ?Network?access?identifier | Network access Identifier |
| PAP | ?Password?authentication?protocol | The password authentication protocol |
| PCF | ?Packet?contro1?function | Packet Control Function |
| PDSN | ?Packet?data?service?node | Packet data serving node |
| PPP | ?Point?to?point?protocol | Point-to-point protocol |
| RADIUS | ?Remote?authentication?dial?unit?service | The service of far-end authentication dial-in user |
| VLR | ?Visiting?location?register | VLR Visitor Location Register |
| BSC | ?Base?station?controller | Base station controller |
| BTS | ?Base?transceive | Base station transceiver |
| PPPoE | ?PPP?over?Ethernet | PPP on the Ethernet |
| AP | ?Access?Point | WAP (wireless access point) |
| WLAN | ?Wireless?Local?Area?Network | WLAN (wireless local area network) |
| APGW | ?AP?Gateway | The AP IAD |
| GRE | ?General?router | Generic route encapsulation |
| IMSI | The international mobile subscriber identifier | |
| MSID | Mobile subscriber's identification | |
| NAI | Network user's identification | |
| Physical?Link | Physical link layer |
Claims (6)
1, the system that combines with WLAN (wireless local area network) of a kind of cdma system comprises cdma network and wlan network; In the described cdma network:
Base station BTS is the wireless portion of base station system, realizes carrying out wireless transmission and relevant controlled function by air interface between BTS and the travelling carriage;
Base station controller BSC/PCF, switching, the realization speech coding of travelling carriage finished in responsible wireless network management, RRM, maintenance management, call treatment, control;
Packet data serving node PDSN/FA: except that the existing function of finishing the cdma-1x network, also should finish the user management of the wireless terminal that inserts by AP; With AAA, network entities such as home agent server HA cooperate authentication, the charging of finishing the user, finish the forwarding of Media Stream;
Authentication, authorize accounting server AAA, the packet data call user is carried out authentication, judgement user's legitimacy; Finish the packet data call billing function, be that the CDMA data user provides authentication, the service of authorizing, account; Also, increase WLAN terminal use's authentication, the processing of authorizing, account at WLAN terminal use's characteristics;
Home agent server HA when travelling carriage uses mobile IP to serve, is used to safeguard the positional information of travelling carriage;
Mobile switching center MSC/VLR is used for the user's access service and the circuit connection of cdma network circuit domain, and dynamic subscriber's information management and business provide etc.;
Attaching position register HLR, storing the information such as positional information, business datum, account management of all mobile subscribers in the fixed area, and can provide inquiry and modification in real time to customer position information, and realize a series of business operations, comprise position renewal, call treatment, authentication, supplementary service etc., finish user mobility management in the mobile radio communication;
In the described wlan network, comprise wireless access point AP, be used for wireless terminal, insert the connection device of telecommunications network,, can provide the access service of speech and data for the user provides wireless access function;
It is characterized in that:
Also comprise the AP IAD APGW that is connected with wireless access point AP, be used for the Business Stream of wireless terminal is carried out tunnel encapsulation by the user, make Business Stream can pass through IP network and arrive PDSN;
Among the described packet data serving node PDSN/FA, also comprise WLAN terminal use's access processing unit, link to each other with CDMA user's access unit, user data area, RADIUS interface respectively.
2, the system that combines with WLAN (wireless local area network) of a kind of cdma system according to claim 1, it is characterized in that: described WLAN terminal use's access processing unit comprises: PPPoE inserts processing unit, and DHCP inserts processing unit.
3, the system that combines with WLAN (wireless local area network) of a kind of cdma system according to claim 1, it is characterized in that: interface adopts 802.3 protocol processes between wireless access point AP and the AP IAD APGW, the user traffic flow of interface keeps MAC Address, customer identification informations such as NAI, make this information can pass to PDSN, identifying user is in order to provide access service.
4, the system that combines with WLAN (wireless local area network) of a kind of cdma system according to claim 1 is characterized in that: the storing point of APGW makes and is convenient to insert three layers of transmission network of IP network between AP and PDSN near AP.
5, the system that combines with WLAN (wireless local area network) of a kind of cdma system according to claim 1, it is characterized in that: described Business Stream with wireless terminal carries out tunnel encapsulation by the user, comprise the tunnel encapsulation that adopts GRE, terminal adopts the access way of PPPOE, and its Service stream formats is:
????PPPOE
????GRE
????IP
????Physical?Link
Increase the protocol type definition of PPPOE in the gre tunneling encapsulation.
6, the system that combines with WLAN (wireless local area network) of a kind of cdma system according to claim 1, it is characterized in that: also comprise the terminal equipment of access network, described terminal equipment is:
Insert the terminal equipment of cdma-1x network;
Support the terminal equipment of 802.1x agreement;
Support to insert the dual-mode terminal of cdma-1x network and 802.1x agreement.
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|---|---|---|---|
| CNA021368120A CN1479494A (en) | 2002-08-31 | 2002-08-31 | System of interconnecting CDMA system and radiolocal network |
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|---|---|---|---|
| CNA021368120A CN1479494A (en) | 2002-08-31 | 2002-08-31 | System of interconnecting CDMA system and radiolocal network |
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