Wimax network, wimax network element, and method of handling QoS requirements therein

1. A method of handling QoS requirements in a wireless communication network comprising:

sending a QoS request message associated with said QoS requirements from a core network to a first receiving wireless access gateway of an access network, wherein the access network is responsible for resource allocation to an end terminal, wherein the first receiving wireless access gateway has been allocated at initial authentication of the end terminal as being responsible for managing the end terminal in terms of the QoS requirements;

forwarding the QoS request message from the first receiving wireless access gateway to a second serving wireless access gateway upon a mobility event of the end terminal, wherein the first receiving wireless access gateway remains responsible for managing QoS requirements of the end terminal.

2. The method of claim 1 , wherein said service is an IP Multimedia Subsystem (IMS) related service.

3. The method of claim 1 , wherein said wireless communication network is a Wimax network or a 3GPP LTE/SAE network.

4. The method of claim 1 , further comprising:

receiving an initial authentication message from an entity of the serving wireless access gateway at the core network, said initial authentication message comprising an identifier of the receiving wireless access gateway;

storing said identifier in the core network;

providing an entity of the core network with said identifier for sending the QoS request message to the receiving wireless access gateway specified by said identifier.

5. A core network for use in a wireless communication network, comprising:

a server that receives an authentication message in connection with an end terminal from an access network of the wireless communication network, said authentication message comprising an identifier of a QoS managing entity in said access network; and

a memory that stores said identifier;

wherein said server continues to send, even after mobility event of the end terminal, a QoS request message in connection with said end terminal to the entity specified by said identifier, such that said entity remains responsible for managing QoS requirements of the end terminal.

6. The core network of claim 5 , wherein said authentication message is an initial authentication message of said end terminal.

7. The core network of claim 5 implemented in a wireless communication network or a Wimax network, comprising a plurality of access networks.

8. A computer program product, comprising program code sequences on a non-transitory computer-readable media operable to implement, in a core network of a wireless communication network, the steps of:

receiving an initial authentication message in connection with an end terminal from an access network of the wireless communication network, said initial authentication message comprising an identifier of a QoS managing entity in said access network;

storing said identifier; and

sending, even after a mobility event of the end terminal, a QoS request message in connection with said end terminal to the entity specified by said identifier, such that said entity remains responsible for managing QoS requirements of the end terminal.

9. The computer program product of claim 8 , further operable to implement the steps of:

receiving QoS request messages from the core network, said QoS request messages comprising QoS requirements for a service required by the end terminal; and

forwarding said QoS request messages to a corresponding network element of a further access network, if the end terminal is attached to said further access network.