The present invention relates to a wireless access system and wireless access method of connecting a wireless terminal to a network via a wireless access point.
In this wireless access system, an authentication message from the WLAN terminal 101 is transmitted to the intra-WLAN authentication server 105 via the WLAN-AP 104. The intra-WLAN authentication server 105 checks identification information (SID (Supplicant ID)) contained in the authentication message from the WLAN terminal 101. If this SID indicates a registered terminal in the WLAN network 102, the intra-WLAN authentication server 105 advances the authentication process. If the SID indicates not a registered terminal in the WLAN network 102 but a registered terminal in the ISP network 103, the intra-WLAN authentication server 105 transfers the authentication message to the authentication server 106 of the corresponding ISP network 103 (e.g., Japanese Patent Laid-Open No. 2003-289331 (reference 1)).
In 3GPP (Third Generation Partnership Project) standardization, specifications for connecting the WLAN network 102 and a 3GPP network (mobile communication network) are presently being examined. At present, no specific conditions are required of the WLAN network 102 in the cooperation between the WLAN network 102 and a 3GPP network.
In
When connecting to the network of a WLAN operator providing the existing WLAN service or to an office network, however, not only the 3GPP network 107 but also the WLAN terminals 101 connecting to the ISP network 103 exist as shown in
Referring to
The present invention has been made to solve the above problem, and has as its object to reduce the processing load on an authentication server in a mobile communication network.
To achieve the above object, a wireless access system of the present invention comprises transfer destination network determining means for determining, on the basis of the type of authentication method of an authentication message transmitted from a wireless terminal, whether to transfer the authentication message to a mobile communication system or a network other than the mobile communication network, and authentication message transferring means for transferring the authentication message to a transfer destination network determined by the transfer destination network determining means.
Also, a wireless access method of the present invention comprises the steps of causing a computer to determine, on the basis of the type of authentication method of an authentication message transmitted from a wireless terminal, whether to transfer the authentication message to a mobile communication network or a network other than the mobile communication network, and transferring the authentication message to a determined transfer destination network.
The present invention determines, on the basis of the type of authentication method of an authentication message transmitted from a wireless terminal, whether to transfer the authentication message to a mobile communication network or a network other than the mobile communication network. For example, the present invention can reduce the processing load on an authentication server in the mobile communication network by transferring only EAP-AKA authentication messages to the mobile communication network.
Exemplary embodiments of the present invention will be explained in detail below with reference to the accompanying drawings.
The WLAN network 2 includes at least one wireless access point (WLAN-AP) 4 (4-1 to 4-n), an authentication server (intra-WLAN authentication server) 5, and a policy control device 9. The ISP network 3 includes an authentication server (intra-ISP authentication server) 6. The 3GPP network 7 includes an authentication server (intra-3GPP authentication server) 8.
Referring to
In this exemplary embodiment, the policy control device 9 as a gateway to the 3GPP network 7 is installed between the wireless access points 4 and authentication server 5 in the WLAN network 2. The policy control device 9 is implemented by hardware including a processor and memory, and a program for implementing various functions in cooperation with the hardware.
As a function unique to this exemplary embodiment, the policy control device 9 has a transfer destination determining function of determining, on the basis of the type of authentication method of an authentication message transmitted from the WLAN terminal 1 via the WLAN-AP 4, whether to transfer the authentication message to the 3GPP network 7 or a network (in this example, the WLAN network 2 or ISP network 3) other than the 3GPP network 7. The transfer destination network determining function of the policy control device 9 will be explained below with reference to sequences shown in
An authentication process sequence when the WLAN terminal 1 connects to the 3GPP network 7 will be explained below with reference to
The WLAN terminal 1 performs the “802.11 Association process” defined by IEEE with respect to the WLAN-AP 4 (step S1), and transmits an authentication process start message (EAPOL-Start) to the WLAN-AP 4 (step S2).
To start the authentication process, the WLAN-AP 4 having received the authentication process start message from the WLAN terminal 1 transmits a request message (EAP Request/Identity) to the WLAN terminal 1 (step S3).
In response to the request message from the WLAN-AP 4, the WLAN terminal 1 returns an EAP message (EAP Response/Identity (NAI and IMSI)) containing NAI (Network Access Identity) and IMSI (International Mobile Subscriber Identity) as an authentication message to the WLAN-AP 4 (step S4). The WLAN-AP 4 transfers the authentication message from the WLAN terminal 1 to the policy control device 9 (step S5). Assume that in this example, the type (EAP type) of authentication method of the authentication message from the WLAN terminal 1 is EAP-AKA.
On the basis of the type (EAP type) of authentication method of the transferred authentication message, the policy control device 9 determines whether the authentication message is an authentication request to the 3GPP network 7 (step S6). If the EAP type is EAP-AKA, the policy control device 9 determines that the authentication message is an authentication request to the 3GPP network 7. If the EAP type is not EAP-AKA but EAP-MD5, EAP-TLS, EAP-SIM, or the like, the policy control device 9 determines that the authentication message is an authentication request to a network other than the 3GPP network 7. In this case, the policy control device 9 determines that the transfer destination network of the authentication message is the 3GPP network 7, because the EAP type is EAP-AKA.
The policy control device 9 specifies the authentication server 8 of the 3GPP network 7 as the transfer destination, i.e., specifies the carrier of the mobile communication service, on the basis of NAI (Network Access Identity) contained in the authentication message, and transfers the authentication message (EAP Response/NAI and IMSI) to the authentication server (intra-3GPP authentication server) 8 of the carrier (step S7). The intra-3GPP authentication server 8 receives the authentication message transferred from the policy control device 9, and performs an authentication process on the WLAN terminal 1 as the transmission source of the authentication message. Note that in processing after that, the policy control device 9 exclusively transfers messages. Also, the intra-3GPP authentication server 8 checks the last authentication information (RAND (the random number of an authentication vector), AUTN (an authentication token), XRES (an authentication response), IK (an integrity key), and CK (a cipher key). If this is the first time, the intra-3GPP authentication server 8 makes inquiries to an HSS (Home Subscriber Server)/HLR (Home Location Register) (not shown) (step S8).
The WLAN terminal 1 receives a request message (EAP Request/AkA Challenge) from the intra-3GPP authentication server 8 (step S9). This request message contains “RAND”, “AUTN”, and “temporaty identifier”. The WLAN terminal 1 performs authentication by “AUTN”, and calculates “IK, CK, and RES” from “RAND” (step S10). The WLAN terminal 1 returns “RES” on a response message (EAP Response/AkA Challenge) to the intra-3GPP authentication server 8 (step S11).
The intra-3GPP authentication server 8 performs authentication by comparing “RES” transmitted from the WLAN terminal 1 with “XRES” (step S12). If “RES” and “XRES” match, the intra-3GPP authentication server 8 transmits a confidential key (Key Material) to the WLAN terminal 1 (step S13), and completes the authentication process.
An authentication process sequence when the WLAN terminal 1 connects to the ISP network 3 will be explained below with reference to
To start the authentication process, the WLAN-AP 4 having received the authentication process start message from the WLAN terminal 1 transmits a request message (EAP Request/Identity) to the WLAN terminal 1 (step S23).
In response to the request message from the WLAN-AP 4, the WLAN terminal 1 returns an EAP message (EAP Response/Identity (Supplicant ID)) containing SID (Supplicant ID) as an authentication message to the WLAN-AP 4 (step S24). The WLAN-AP 4 transfers the authentication message from the WLAN terminal 1 to the policy control device 9 (step S25). Assume that in this example, the type (EAP type) of authentication method of the authentication message from the WLAN terminal 1 is not EAP-AKA but EAP-MD5, EAP-TLS, EAP-SIM, or the like.
On the basis of the type (EAP type) of authentication method of the transferred authentication message, the policy control device 9 determines whether the authentication message is an authentication request to the 3GPP network 7 (step S26). If the EAP type is EAP-AKA, the policy control device 9 determines that the authentication message is an authentication request to the 3GPP network 7. If the EAP type is not EAP-AKA but EAP-MD5, EAP-TLS, EAP-SIM, or the like, the policy control device 9 determines that the authentication message is an authentication request to a network other than the 3GPP network 7.
In this case, the policy control device 9 determines that the transfer destination network of the authentication message is a network other than the 3GPP network 7, because the EAP type is not EAP-AKA but EAP-MD5, EAP-TLS, EAP-SIM, or the like. The policy control device 9 transfers the authentication message to the intra-WLAN authentication server 5 (step S27).
The intra-WLAN authentication server 5 checks SID contained in the authentication message from the policy control device 9. If SID indicates a registered terminal in the ISP network 3, the intra-WLAN authentication server 5 transfers the authentication message to the authentication server (intra-ISP authentication server) 6 of the corresponding ISP network 3 (step S28). The intra-ISP authentication server 6 receives the authentication message transferred from the intra-WLAN authentication server 5, and performs an authentication process on the WLAN terminal 1 as the transmission source of the authentication message (step S29). If the authentication is successful, the intra-ISP authentication server 6 transmits a confidential key (Key Material) to the WLAN terminal 1 (step S30).
Note that if SID contained in the authentication message from the policy control device 9 indicates a registered terminal in the WLAN network 2, the intra-WLAN authentication server 5 performs an authentication process (step S31) as shown in
In this exemplary embodiment as described above, on the basis of the type of authentication method of an authentication message transmitted from the WLAN terminal 1 via the WLAN-AP 4, the policy control device 9 determines whether to transfer the authentication message to the 3GPP network 7 or a network other than the 3GPP network 7. Since, therefore, EAP-AKA authentication messages alone are transmitted to the 3GPP network 7, the processing load on the intra-3GPP authentication server 8 reduces.
Also, in this exemplary embodiment, if the policy control device 9 determines that the transfer destination network of the authentication message is the 3GPP network 7, the policy control device 9 specifies the authentication server 8 of the 3GPP network 7 as the transfer destination on the basis of NAI contained in the authentication message. Accordingly, the authentication message is immediately transferred to the authentication server 8 in the appropriate 3GPP network 7.
Furthermore, in this exemplary embodiment, the policy control device 9 is installed as a gateway to the 3GPP network 7 between the WLAN-AP 4 and intra-WLAN authentication server 5, and given the transfer destination network determining function. This makes cooperation with the 3GPP network 7 possible without giving the intra-WLAN authentication server 5 any function taking account of cooperation with the 3GPP network 7. That is, cooperation with the 3GPP network 7 can be achieved by using the existing intra-WLAN authentication server 5 without affecting an authentication process on the WLAN network 2 or ISP network 3.
In this example, the policy control device 9 has a management table that defines, for each WLAN-AP 4, the number of WLAN terminals 1 connectable to the 3GPP network 7 (the number of 3GPP connectable terminals), and the number of WLAN terminals 1 connectable to a network other than the 3GPP network 7 (the number of ISP connectable terminals). This management table is changeably preset in the policy control device 9 by the manager of the WLAN network 2. Table 1 shows an example of the management table.
The policy control device 9 determines whether the WLAN terminal 1 having requested authentication requests authentication to the 3GPP network 7 or authentication to a network other than the 3GPP network 7, and permits or rejects the authentication request from the WLAN terminal 1 in accordance with the number of 3GPP connectable terminals or the number of ISP connectable terminals in the management table.
For example, when an authentication message transmitted from the WLAN terminal 1-1 via the WLAN-AP 4-1 is an authentication request to the 3GPP network 7 and the number of 3GPP connectable terminals of the WLAN-AP 4-1 is exceeded if this authentication request is permitted, the authentication request from the WLAN terminal 1-1 is rejected. If the number of 3GPP connectable terminals of the WLAN-AP 4-1 is not exceeded, the authentication request from the WLAN terminal 1-1 is permitted.
As described above, the policy control device 9 manages, for each WLAN-AP 4, the number of WLAN terminals 1 connectable to the 3GPP network 7 and the number of WLAN terminals 1 connectable to a network (in this example, the WLAN network 2 and ISP network 3) other than the 3GPP network 7. This makes it possible to perform segregation control of WLAN terminals to be connected to the 3GPP network and a network other than the 3GPP network, and call receiving control.
Accordingly, it is possible to implement traffic control taking account of terminals connected to the 3GPP network 7 and those connected to a network other than the 3GPP network 7, e.g., it is possible to limit authentication messages to the 3GPP network 7. It is also possible to avoid the possibility that a wireless channel is occupied by one of the 3GPP network 7 and a network other than the 3GPP network by the intention of the designer of the WLAN network 2. Furthermore, the policy control device 9 collectively manages the wireless resources of the WLAN network 2. This makes it possible to perform an efficient network operation, e.g., control the activity ratio of the WLAN network 2 by contract with the 3GPP operator.
The main functions of the WLAN network 2 described above will be collectively explained below with reference to
The transfer destination network determining unit 21 determines, on the basis of the type of authentication method of an authentication message transmitted from the WLAN terminal 1 via the WLAN-AP 4, whether to transfer the authentication message to the 3GPP network 7 or a network (in this example, the WLAN network 2 or ISP network 3) other than the 3GPP network 7. More specifically, the transfer destination network determining unit 21 performs the processing in step S6 of
If the transfer destination network determining unit 21 determines that the transfer destination network of the authentication message is the 3GPP network 7, the authentication server specifying unit 22 specifies the authentication server 8 in the 3GPP network 7 as the transfer destination on the basis of NAI contained in the authentication message.
The authentication message transfer unit 23 transfers the authentication message to the transfer destination network determined by the transfer destination network determining unit 21. In particular, the authentication message transfer unit 23 transfers the authentication message to the authentication server 8 specified by the authentication server specifying unit 22. More specifically, the authentication message transfer unit 23 performs the processing in steps S7 and S8 of
The connectable terminal count storage unit 24 stores the management table as shown in Table 1. The authentication request permitting unit 25 permits the transfer of the authentication message to the transfer destination network determined by the transfer destination network determining unit 21, within the ranges of the number of GPP connectable terminals and the number of ISP connectable terminals in the management table.
Note that in the exemplary embodiment described above, the policy control device 9 is installed between the WLAN-APs 4 and intra-WLAN authentication server 5, and given the transfer destination network determining function. However, the transfer destination network determining function may also be imparted to the intra-WLAN authentication server 5 or WLAN-APs 4.
Number | Date | Country | Kind |
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2006-044933 | Feb 2006 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2006/324927 | 12/14/2006 | WO | 00 | 8/20/2008 |