Communication system that provides backup communication services to a plurality of communication devices

1. A communication system that provides backup wireless communication services, comprising:

a plurality of communication devices that include at least one first communication device subscribed to a first class of service and at least one second communication device subscribed to a second class of service;

a database including subscription information of the at least one first communication device and the at least one second communication device;

a main system component that normally serves all of the plurality of the communication devices; and

a backup system component for the main system component that, in response to the main system component going out of service, operates to:

obtain subscription information from the database for a particular communication device needing service;

provide service to the particular communication device needing service if the subscription information indicates that the particular communication device subscribes to the first class of service; and

terminate service to the particular communication device needing service if the subscription information indicates that the particular communication device subscribes to the second class of service.

2. The communication system of claim 1 , wherein the first class of service has a higher service priority relative to the second class of service.

3. The communication system of claim 2 , wherein the first class of service corresponds to an emergency service and the second class of service corresponds to a non-emergency service.

4. The communication system of claim 1 , wherein the main system component is a main base station and the backup system component is a backup base station.

5. The communication system of claim 1 , wherein the backup system component has a lower capacity than the main system component for substantially same coverage area.

6. The communication system of claim 1 , wherein the backup system has a higher reliability than the main system component.

7. The communication system of claim 1 , wherein information about the class of service for each communication device is stored in the system.

8. The communication system of claim 1 , wherein the at least one communication device informs the system relative to a subscribed class of service.

9. The communication system of claim 1 , wherein the plurality of communication devices, the at least one first communication device, and the at least one second communication device are mobile communication devices.

10. A method for providing wireless communication services to a plurality of communication devices, wherein the plurality of communication devices include at least one first communication device subscribed to a first class of service and at least one second communication device subscribed to a second class of service, comprising:

normally serving all of the plurality of the communication devices using a main system component;

providing service to a particular communication device by a backup system component in response to the main system component going out of service, if the particular communication device subscribes to the first class of service;

accessing a database including subscription information of the at least one first communication device and the at least second communication device; and

terminating service to the particular communication device, in response to the main system component going out of service, if the particular communication device subscribes to the second class of service.

11. The method of claim 10 , wherein the backup system component only serves the at least one first communication device subscribed to the first class of service, when the main system component goes out of service.

12. The method of claim 10 , wherein the first class of service has a higher service priority relative to the second class of service.

13. The method of claim 10 , wherein the main system component is a main base station and the backup system component is a backup base station.

14. The method of claim 10 , wherein the backup system component has a lower capacity than the main system component for substantially same coverage area.

15. The method of claim 10 , wherein the backup system has a higher reliability than the main system component.

16. The method of claim 10 , wherein the plurality of communication devices, the at least one first communication device, and the at least one second communication device are mobile communication devices.