Method and apparatus for selecting a frequency layer for connected mode UE in a MBMS mobile communication sytem

one. A method for selecting a frequency level in a user terminal (UE) in a connected mode at a non-preferred frequency level (NPL) in a mobile communication system, providing a multimedia broadcast / multicast service (MBMS), comprising the steps of receiving a message from a radio network controller (RNC), including information about the preferred frequency, associated with the preferred frequency level (PL) of the MBMS service, definitions Does the preferred frequency information include service restriction information at the preferred frequency level PL, switching to the preferred frequency level PL, if the information about the preferred frequency does not include information about the restriction of services at the preferred frequency level PL, and continue to use the current frequency if the preferred frequency information includes service restriction information at the preferred frequency level PL. 2. The method of claim 1, further comprising the step of storing the current frequency if the user terminal UE in connected mode is not at any non-preferred frequency NPL level. 3. The method of claim 1, wherein the preferred frequency information includes service restriction information at a preferred frequency PL level if the radio resources of the preferred frequency PL level are insufficient to accommodate user terminal UE traffic that desires to receive the MBMS service in connected mode or a predefined radio resource management (RRC) state. four. The method of claim 1, wherein the service restriction information at a preferred frequency level PL is represented by a bitmap or an integer indicating the applicability of the frequency level convergence process (FLC) for each state of the connected mode. five. A method for selecting a frequency level in a user terminal UE in a connected mode at a non-preferred frequency level NPL in a mobile communication system providing an MBMS service, comprising the steps receiving from the RNC controller a message including the preferred frequency information associated with the preferred frequency level PL of the MBMS service, determining whether the preferred frequency information includes service restriction information at the preferred frequency level PL, switching to the preferred frequency level PL, if the information on the preferred frequency does not include information about the restriction of services at the preferred frequency level PL, performing priority-based service selection if the preferred frequency information includes service restriction information at the preferred frequency level PL, and determining whether the user terminal UE in connected mode continues to use the current frequency in accordance with the result of the priority-based service selection. 6. The method of claim 5, further comprising the step of continuing to use the current frequency after selecting the dedicated traffic service currently being performed at the current frequency. 7. The method of claim 5, further comprising the step of interrupting the allocated traffic service and switching to the preferred frequency level PL after selecting the MBMS service. eight. The method of claim 5, further comprising the step of storing the current frequency if the user terminal UE in connected mode is not at any non-preferred frequency NPL level. 9. The method of claim 5, wherein the preferred frequency information includes service restriction information at a preferred frequency PL level if the radio resources of the preferred frequency PL level are insufficient to accommodate user terminal UE traffic that desires to receive the MBMS service in connected mode or a predefined radio resource management (RRC) state. ten. The method of claim 5, wherein the service restriction information at a preferred frequency level PL is represented by a bitmap or integer indicating the applicability of the frequency level convergence process (FLC) for each state of the connected mode. eleven. A device in a user terminal UE for selecting a frequency level in a connected mode in a mobile communication system providing an MBMS service comprising a message receiver for receiving from the RNC controller a message including preferred frequency information associated with a preferred frequency level PL of the MBMS service, a service controller for determining whether the user terminal UE is in connected mode at the non-preferred frequency level NPL, and whether information about the preferred frequency includes information about the restriction of services at the preferred frequency level PL, and a data receiver for switching to a preferred frequency level PL and receiving MBMS services, if the user terminal UE in connected mode is at the non-preferred frequency NPL level, and the preferred frequency information does not include service restriction information at the preferred frequency level PL, and continued use of the current frequency, if the user terminal UE in connected mode is at the non-preferred frequency NPL level, and preferred frequency information includes service restriction information at a preferred frequency level PL. 12. The apparatus of claim 11, wherein the data receiver stores the current frequency if the user terminal UE in connected mode is not at any non-preferred NPL frequency level. 13. The apparatus of claim 11, wherein the service controller performs a priority selection service if the user terminal UE is in the non-preferred frequency NPL in connected mode and the preferred frequency information includes service restriction information at the preferred frequency PL. 14. The apparatus of claim 13, wherein the data receiver continues to use the current frequency after selecting the dedicated traffic service currently being performed on the current frequency, and interrupts the dedicated traffic service and switches to the preferred frequency level PL after selecting the MBMS service. 15. The apparatus of claim 11, wherein the preferred frequency information includes service restriction information at a preferred frequency PL level if the radio resources of a preferred frequency PL level are insufficient to accommodate user terminal UE traffic that desires to receive an MBMS service in connected mode or a predefined radio resource management (RRC) state. sixteen. The apparatus of claim 11, wherein the service restriction information of the preferred frequency level PL is represented by a bitmap or integer indicating the applicability of the frequency level convergence process (FLC) for each state of the connected mode. 17. A method for controlling the selection of the frequency level in user terminals of the UE in connected mode by an RNC in a mobile communication system providing an MBMS service, comprising the steps determining preferred frequency information, including any service restriction information at the preferred frequency PL level, which restricts the user terminals UE in connected mode in cells controlled by the RNC from reconfiguring MBMS services requested by the user terminals UE to the preferred frequency PL levels connected mode, and transmitting to user terminals the UE in a connected message mode including information on a preferred frequency. 18. The method of claim 17, wherein the preferred frequency information includes service restriction information at a preferred frequency PL level if the radio resources of the preferred frequency PL level are insufficient to accommodate user terminal UE traffic that desires to receive the MBMS service in connected mode or a predefined radio resource management (RRC) state. nineteen. The method of claim 17, wherein the service restriction information at a preferred frequency level PL is represented by a bitmap or integer indicating the applicability of the frequency level convergence process (FLC) for each state of the connected mode. 20. A device for controlling the selection of the frequency level in user terminals of the UE in connected mode by the RNC in a mobile communication system providing an MBMS service comprising a frequency level convergence process controller (FLC) for determining preferred frequency information including service restriction information at a preferred frequency level PL, which restricts user terminals UE in connected mode in cells controlled by an RNC from being tuned to preferred frequency levels PL MBMS services requested by the user terminals of the UEs in connected mode, and a message transmitter for transmitting to user terminals the UE in a connected message mode including preferred frequency information. 21. The apparatus of claim 20, wherein the preferred frequency information includes service restriction information at a preferred frequency PL level if the radio resources of the preferred frequency PL level are insufficient to accommodate user terminal UE traffic that desires to receive the MBMS service in connected mode or a predetermined radio resource management (RRC) state. 22. The apparatus of claim 20, wherein the service restriction information at a preferred frequency level PL is represented by a bitmap or integer indicating the applicability of the frequency level convergence process (FLC) for each state of the connected mode. 23. The device according to claim 20, further comprising a radio resource manager for managing the radio resources of the cells, measuring the amount of radio resources available for each frequency in the cells, and outputting the measurement results to the FLC controller for use in determining information about the preferred frequency. 24. A method for selecting a frequency level in a user terminal UE in a connected mode at a non-preferred frequency level NPL in a mobile communication system providing an MBMS service, comprising the steps receiving from the RNC controller a message including the preferred frequency information associated with the preferred frequency level PL of the MBMS service, and determining whether the preferred frequency information includes service restriction information at the preferred frequency level PL. 25. The method according to claim 24, further comprising the step of switching to the preferred frequency level PL, if the information on the preferred frequency does not include information about restricting the service at the preferred frequency level PL. 26. The method of claim 24, further comprising the step of continuing to use the current frequency if the preferred frequency information includes service restriction information at the preferred frequency level PL.