1

A method for resource admission control, comprising: during a resource request process in the scenario of customer roaming, after receiving a resource request message from a home location policy decision functional entity (PD-FE), a visited location PD-FE carrying out an authorization check on the message, if the check is not passed, the visited location PD-FE feeding its acceptable quality of service (QoS) policy information or a modified QoS policy back to the home location PD-FE.

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2

The method according to Claim 1, before the visited location PD-FE receives the resource request message from the home location PD-FE, the method further comprising:the home location PD-FE receiving a service request message from service control functions (SCF), making a resource policy decision according to the service request message, a local operator policy and customer subscription information, and sending the visited location PD-FE a resource request message in which a QoS policy made by the home location PD-FE is contained.

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3

The method according to Claim 2, wherein after receiving a service request message from the SCF, the home location PD-FE first carries out an authorization check on the service request message, if the check is passed, the home location PD-FE makes a resource policy decision and performs the step of sending a resource request message; if the check is not passed, the home location PD-FE sends a service request response message to the SCF to reject the service request.

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4

The method according to Claim 1, wherein the process that the visited location PD-FE feeds its acceptable QoS policy information back to the home location PD-FE is that: the visited location PD-FE sends the home location PD-FE a resource request rejection message in which the QoS policy information acceptable to the visited location PD-FE is contained, and after receiving the resource request rejection message, the home location PD-FE sends a service request response message to the SCF to reject the service request.

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5

The method according to Claim 4, wherein after receiving the resource request rejection message from the visited location PD-FE, the home location PD-FE further records the QoS policy information acceptable to the visited location PD-FE; after receiving the next service request message from the SCF, the home location PD-FE makes a resource policy decision according to the recorded QoS policy information acceptable to the visited location PD-FE, local operator policy information and customer subscription information, generates a resource request message, and sends the resource request message to the visited location PD-FE.

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6

The method according to Claim 1, wherein the process that the visited location PD-FE feeds a modified QoS policy back to the home location PD-FE is that: the visited location PD-FE modifies the QoS policy in the resource request message according to a local operator policy, and sends the home location PD-FE a resource request response message in which the modified QoS policy is contained.

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7

The method according to Claim 6, wherein after receiving the resource request response message from the visited location PD-FE, the home location PD-FE checks whether the QoS policy modified by the visited location PD-FE is acceptable, if yes, the home location PD-FE makes a final resource policy decision according to the modified QoS policy, customer subscription information and a local operator policy, generates a final resource request message, and sends the final resource request message to the visited location PD-FE to request resources; if no, the home location PD-FE sends a service request response message to the SCF to reject the service request.

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8

The method according to Claim 7, wherein after receiving the final resource request message from the home location PD-FE, the visited location PD-FE carries out an authorization check on the final resource request message, if the check is passed, the visited location PD-FE performs the following steps:interacting with a visited location transport resource control functional entity (TRC-FE) to check resource availability information;

making a final resource admission decision according to the QoS policy in the final resource request message and the resource availability information which is used as a response from the visited location TRC-FE;

distributing a policy rule to a visited location policy enforcement functional entity (PE-FE) which implements a policy installation; and

sending a resource request response message to the home location PD-FE.

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9

A resource admission control system, including a home location PD-FE and a visited location PD-FE; the home location PD-FE further including an information collecting module, a policy decision module and a policy negotiating module, the visited location PD-FE further including an authorization checking module, a policy feedback module and a resource admission decision module, whereinthe information collecting module being used for receiving a service request message from SCF and acquiring customer subscription information and a local operator policy;

the policy decision module being used for making an initial resource policy decision according to the service request message received by the information collecting module and the acquired customer subscription information and local operator policy, and sending the authorization checking module of the visited location PD-FE a resource request message in which a QoS policy is contained;

the authorization checking module being used for carrying out an authorization check on the resource request message after receiving the resource request message from the policy decision module, sending a check failure message to the policy feedback module if the check is not passed, and sending a check success message to the resource admission decision module if the check is passed;

the policy feedback module being used for feeding QoS policy information acceptable to the visited location PD-FE or a modified QoS policy back to the policy negotiating module of the home location PD-FE after receiving the check failure massage from the authorization checking module;

the policy negotiating module being used for receiving and processing the QoS policy information acceptable to the visited location PD-FE or the modified QoS policy which is fed back by the policy feedback module; and

the resource admission decision module being used for interacting with a visited location TRC-FE to make a resource admission decision after receiving the check success message.

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10

The system according to Claim 9, wherein the process that the policy feedback module of the visited location PD-FE feeds QoS policy information acceptable to the visited location PD-FE back to the home location PD-FE is that: the policy feedback module of the visited location PD-FE sends the home location PD-FE a resource request rejection message in which the QoS policy information acceptable to the visited location PD-FE is contained; andafter receiving the QoS policy information acceptable to the visited location PD-FE from the policy feedback module, the policy negotiating module of the home location PD-FE sends a service request response message to the SCF to reject the service request.

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