Abstract:
There is disclosed a method for providing a user policy to a terminal connected in a network, the method comprising: configuring a user policy for the terminal; and authenticating the terminal, wherein the method further includes providing the configured user policy to the terminal responsive to successful authentication.

Description:
BACKGROUND TO THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The invention relates to the provision of a user policy to a terminal connected in a network. The invention particularly but not exclusively relates to the provision of a user policy to a terminal connected in a visited network.  
         [0003]     2. Description of the Related Art  
         [0004]     Mobile communication systems are an example of a network arrangement where a terminal, such as a mobile terminal, may move between, and connect into, different networks. In a mobile communication system, a mobile terminal will typically be associated with a particular network, known as its home network, and may roam throughout the system and connect into other networks, termed visited networks.  
         [0005]     In a mobile communication system, a terminal is typically provided with a user policy. The user policy is some policy associated with the terminal, and is applied to traffic transmitted to or from the terminal. The policy may be, for example, a quality of service policy or a security policy.  
         [0006]     The quality of service (QoS) to be applied to particular traffic may depend upon multiple parameters. One parameter is the user subscription level. For example, a user may be associated with one of two subscription levels, being labelled silver and gold. All other things being equal, the gold subscription level should result in a higher or equal QoS than a silver subscription level. Another parameter is the type of traffic, for example real-time, interactive, background etc.  
         [0007]     The operator policy determines the mapping from a multi-dimensional tuple, such as subscription level or type of traffic, to a single dimensional value, for example, 1, 2, 3 etc., which defines the QoS level. The QoS level defines how a packet is treated, and marked, for example for the QoS purpose.  
         [0008]     When a user is roaming in a mobile communication system, and is connected to a visited network, the policy applied is the one of the visited operator. That policy may be different from the policy of the home operator. Thus, the same type of traffic may be mapped to a different QoS level in the visited network compared to the level it will be mapped to in the home network. For downlink traffic, the visited network may apply the local policy of the visited network to determine a QoS level, and treat the traffic according to that QoS level.  
         [0009]     It is an aim of the invention to provide for an appropriate handling of uplink traffic in accordance with an appropriate user policy.  
       SUMMARY OF THE INVENTION  
       [0010]     There is provided a method for providing a user policy to a terminal connected in a network, the method comprising: configuring a user policy for the terminal; and authenticating the terminal, wherein the method further includes providing the configured user policy to the terminal responsive to successful authentication.  
         [0011]     There is provided a mobile communication system including a terminal for connection in a network, the system including a network element for configuring a user policy for the terminal, the system further being adapted to authenticate the terminal, wherein responsive to successful authentication the network element is adapted to provide the configured user policy to the terminal.  
         [0012]     There is provided a user terminal for connection in a network of a mobile communication system, the user terminal being adapted to receive a configured user policy at an input thereof, and to implement said configured user policy.  
         [0013]     There is provided a network element for a mobile communication system having at least one user terminal for connection in a network, the network element being adapted to configure a user policy for the terminal, to authenticate the terminal, and responsive to successful authentication to provide the configured user policy to the terminal.  
         [0014]     The invention and embodiments thereof provides a method for providing a user policy to a terminal. The invention preferably relates to the provision of such a technique when a terminal is connected in a visited network.  
         [0015]     The user policy may be a Quality of Service (QoS) policy or a security policy, in accordance to the visited network policy for example.  
         [0016]     Preferably the policy is based on at least one of a user subscription policy, a roaming agreement between the visited and home network operators, and the local policy of the visited network. This may apply even when the visited and home networks belong to the same operator. The user subscriber policy is preferably the subscriber policy of the terminal&#39;s home network.  
         [0017]     Preferably the terminal applies the policy to all uplink packets from the terminal.  
         [0018]     The invention thus ensures that the user policy in the visited network is synchronised.  
         [0019]     The method preferably includes, responsive to detection of the terminal in the visited network, the step of obtaining the subscriber policy from the home network. The subscriber policy is preferably pulled from the home network by the visited network. The subscriber policy is preferably obtained from the home network during an authentication procedure for the terminal.  
         [0020]     The provided user policy may be delivered to the terminal during the authentication procedure. The provided user policy may be piggy-backed in an authentication message to the terminal.  
         [0021]     The provided user policy may be delivered in a specific message.  
         [0022]     The provided user policy is preferably enforced following successful authentication.  
         [0023]     The authentication procedure may be provided by a protocol for carrying authentication for network access, for example PANA, procedure. The authentication scheme is preferably an authentication and key agreement scheme. The PANA procedure may also preferably provide for registration of the terminal in the visited network.  
         [0024]     The configuration of the user profile for the terminal in the visited network is preferably by an access network control server, ACS. The user profile is preferably delivered to the terminal by the ACS following successful authentication. The user profile is preferably provided to the terminal in a PANA_Success message. 
     
    
     BRIEF DESCRIPTION OF THE FIGURES  
       [0025]     The invention is now described by way of example with reference to the accompanying Figures in which:  
         [0026]      FIG. 1  illustrates an arrangement of a home network and a visited network, in which example scenario the invention may be advantageously applied;  
         [0027]     FIGS.  2 ( a ) and  2 ( b ) illustrate the user policy in the different networks of  FIG. 1 ; and  
         [0028]      FIG. 3  illustrates the registration and authentication procedure of a terminal where the user profile is further delivered to the terminal in accordance with a preferred embodiment of the invention. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0029]     The invention is described herein by way of reference to a particular embodiment. It should be understood that the invention is not limited to the specific aspects of the described embodiment. In particular, the invention is described herein in relation to a mobile terminal roaming in a mobile communications system between networks.  
         [0030]     Referring to  FIG. 1 , there is illustrated an exemplary mobile communication system including two networks, a network  104  denoted a home network and a network  102  denoted a visited network. As shown in  FIG. 1 , a mobile terminal  108  is currently located in the visited network  102 . The home network  104  is the normal network with which the mobile terminal  108  is usually associated. The principles of roaming of mobile terminals across networks in a mobile communication system is well-known in the art.  
         [0031]     With further reference to  FIG. 1 , those elements of the communication system necessary for understanding an implementation of the present invention are further illustrated. Referring to the visited network  102 , there is illustrated a base transceiver station (BTS) or access point (AP)  106 , which provides a connection into the visited network  102  for the mobile terminal  108 . The visited network  102  additionally includes a visited network authentication, authorisation, and accounting server (AAAv)  110 ; an access router (AR)  116  and an access network control server (ACS)  118 .  
         [0032]     In this illustration, the home network includes a home network AAA server, AAAh,  114 , and Home Subscriber Server, HSS,  120 .  
         [0033]     The access network control server  118  and the access router  116  provide access to the visited network in the mobile communication system as is well-known in the art. As is illustrated in  FIG. 1 , in the visited network the AAAV  110  is connected to the ACS  118 , the ACS  118  is connected to the AR  116 , and the AR  116  is in turn connected to the BTS/APs  106 . In the home network the AAAH  114  is connected to the HSS  120 . The AAAV  110  is connected to the AAAH  114 . The interconnection of the various elements of the mobile communication system illustrated in  FIG. 1  is not described in detail any further herein, as such interconnection and the operation of such interconnections will be well-known to one skilled in the art.  
         [0034]     Referring to  FIGS. 2   a  and  2   b , there is illustrated examples of quality of service (QoS) level policies maintained by the operators associated with each of the home network  104  and the visited network  102 .  
         [0035]      FIG. 2   a  illustrates the policy for a subscriber whose home network is the home network  104 , which is assumed to be under the control of an operator A.  FIG. 2   b  illustrates the policy for roaming users having a home network of the home network  104 , which are roaming in the visited network  102 . The visited network  102  is illustrated to be under the control of an operator B. When a subscriber from the operator A domain, i.e. the home network  104 , is roaming in the serving network that belongs to the domain of the operator B, i.e. the visited network  102 , that subscriber will follow the policy of operator B for roaming users from operator A.  
         [0036]     For example, when a gold level subscriber from the home network  104 , running a conversational application, is roaming in the visited network  102 , the subscriber is assigned a QoS level of  1 , which is the same QoS level when the subscriber is connected in its own home network. However, when a silver level subscriber whose home network is the home network  104 , also running a conversational application, is roaming in the visited network  102 , the subscriber is assigned a QoS level  2 , which is different from the QoS level  1  it would ordinarily be assigned in its home network.  
         [0037]     As another example, it can be seen that when a gold level subscriber associated with the home network  104  is running an interactive application, and is roaming in the visited network  102 , the subscriber is assigned a QoS level  3  which is different than a QoS level  2  it would normally be assigned in its own home network  104 . However when a silver level subscriber whose home network is the home network  104 , also running an interactive application, is roaming in the visited network  102 , the subscriber is assigned a QoS level  3 , which is the same QoS level the subscriber would be allocated if connected in its home network  104 .  
         [0038]     For each traffic type, the QoS level is determined by a subscriber profile, a local policy in the visited network and the roaming agreement between the operators.  
         [0039]     The operation of the invention is now described in further detail with reference to the signalling chart of  FIG. 3 . Referring to  FIG. 3 , the signalling that takes place when the mobile terminal  108  roams into the visited network  102  is illustrated.  
         [0040]     As denoted by signalling  302  in  FIG. 3 , an initial lower layer procedure takes place between the mobile terminal  108  and the BTS/AP  106 . Following the lower layer procedure, an upper layer procedure, denoted by signalling  304 , takes place between the mobile terminal  108  and the access router  116  and the access network control server  118 .  
         [0041]     After the initial lower layer and upper layer procedures, registration takes place. For the purposes of the described embodiment, it is assumed that a protocol for carrying authentication for network access, PANA, procedure is used for registration and authentication.  
         [0042]     As denoted by signalling  306 , a PANA initialisation procedure takes place between the mobile terminal  108  and the access network control server  118 .  
         [0043]     Thereafter, as denoted by signalling  308 , a PANA identity request/response procedure takes place between the mobile terminal  108  and the access network control server  118 .  
         [0044]     Following these procedures, the access network control server authenticates the mobile terminal by locating the home network of the mobile terminal and communicating with such home network. Thus, as denoted by a signalling  310 , a subscriber profile/authentication vector request/response takes place between the access network control server  118  and the Home Subscriber Server  120  (represented by the “home domain” in  FIG. 3 ), through the AAA servers  110  and  114  of the visited network  102  and home networks  104 .  
         [0045]     Thereafter the access network control server  118  configures a user profile or user policy for the mobile terminal  108 . This user profile may be based on the subscriber profile for the mobile terminal obtained from the home network, the roaming agreement between the visited network and the home network, and/or the local policy of the visited network.  
         [0046]     In a preferred embodiment, the roaming agreement between the home network operator and the visited network operator governs the user policy. In a simple example, the user policy may be determined by the lowest level of each of the subscriber profile in the home network and the roaming agreement between the visited and home networks. With further reference to  FIG. 2 , a silver level subscriber has a a priority  1  for conversational traffic in the home network, but the roaming agreement provides for a priority of 2. In such case the priority of 2 may be applied as the user profile, being the least value priority amongst all values, and a priority which therefore complies with both the subscriber policy and the roaming policy.  
         [0047]     It will be understood that the attributes determining the user policy may be more than just a priority value. Other attributes may be, for example, the maximum bandwidth or the maximum delay.  
         [0048]     The policy in the visited network may be taken into account, for example, if the local policy does not support data encryption, then the new user policy should take that into account, even though the home network of the subscriber may require encryption.  
         [0049]     In summary, therefore, the user policy is preferably determined in dependence on the lowest common denominator, for any particular attribute, between all policies taken into account. The lowest common denominator will result in a value for any attribute being chosen which does not conflict with the value limit or range of any policy. Thus, for example, where the attribute is maximum bandwidth, where two different policies identify two different values, the lowest of such values is chosen.  
         [0050]     As discussed above, the policies taken into account for each attribute may include the subscriber policy in the home network, the roaming agreement between the home network and the visited network, and the local policy of the visited network.  
         [0051]     The attributes themselves may include a priority value, a maximum bandwidth value, or a maximum delay value for example.  
         [0052]     The PANA procedure is then continued by the transmission of a PANA authorisation message, as denoted by signalling  312 , from the access network control server  118  to the mobile terminal  102 . The PANA authorisation signalling  312  includes an EAP_Request/AKA Challenge. Thereafter the access network control server  118  receives a PANA authorisation response, as denoted by signalling  314 , from the mobile terminal  108 . The PANA authorisation signalling  314  includes an EAP_Response/AKA Challenge. The access network control server  118  then compares the AT_RES and the XRES. Based on such comparison, authentication is established.  
         [0053]     Following successful authentication, the access network control server  118  transmits a PANA success message, as denoted by signalling  316 , to the mobile terminal  108 . The PANA success message includes an EAP_Success field. In accordance with the invention, the PANA success message also includes a user profile, specifically a new user profile for the mobile terminal  108 .  
         [0054]     It should be noted that the PANA procedure described hereinabove is known in the art, and is not described in detail for this reason. The invention is not limited in its applicability to scenarios where the PANA procedure is used, nor to scenarios where AKA authentication is used.  
         [0055]     Thus, in general, when a mobile terminal powers up in a visited network, the visited network pulls the subscriber policy for the mobile terminal from the mobile terminals home network. The mobile terminal subscriber policy may be pulled from the home network, for example, during an authentication procedure. Preferably based on the roaming agreement between the visited network and the home network operators, the visited network local policy, and the subscriber policy (derived from the home network), the visited network operator may configure a user policy for the mobile terminal.  
         [0056]     The user policy is delivered to the mobile terminal so that the mobile terminal can properly treat and mark uplink packets. The user policy may be piggy-backed in an authentication message, and the user policy may be enforced when the mobile terminal has been successfully authenticated. In an alternative, the user policy may be delivered to the mobile terminal in a new, specific message.  
         [0057]     Advantageously, the invention enables local networks to enforce local policies in the mobile terminal, even when the mobile terminal is associated with a different network. The user policy satisfies a roaming agreement between the home and visited network operators, and the visited network local policy. The delivery of a user policy to the mobile terminal allows the mobile terminal to properly treat and mark each uplink in the visited network. It also synchronises the policy in the mobile terminal and the visited network. The preferable piggy-backing of the user policy in an authentication procedure means that the invention can be implemented without a requirement for additional signalling.  
         [0058]     The embodiments of the invention described herein have been presented in the context of determining a user policy for a terminal connected in a visited network. The invention is not, however, limited in its applicability to the determination of a user policy in a visited network. For example, in an alternative, a new user policy may be determined and provided to a terminal in different circumstances. For example, an equipment failure may force the determination and communication of a new user policy for a subscriber connected in its home network. It is also envisaged that the invention may be utilised in an emergency situation, where the priority of a group of subscribers is set. This may include, for example, a broadcast to place all subscribers at the lowest priority setting and only a certain group of users are given the higher priority.  
         [0059]     The invention has been described herein by way of reference to a particular, non-limiting example. The scope of protection afforded by the invention is defined by the appended claims.