A communication device for handling a radio resource control, RRC, connection resume procedure, comprising: a storage unit, for storing instructions; and a processing circuit, coupled to the storage unit, wherein the storage unit stores, and the processing circuit is configured to execute, the instructions of: establishing a RRC connection with a network; suspending the RRC connection, when receiving a RRC message for suspending the RRC connection; resuming the RRC connection with the network, when initiating a service request procedure; transmitting a first EXTENDED SERVICE REQUEST message comprising a service type information element, IE, to the network after the RRC connection is resumed, if the service request procedure is initiated for a packet switched, PS, service and the communication device is required to transmit an IE related to the PS service other than the service type IE; and the communication device is further characterised by not transmitting a first EXTENDED SERVICE REQUEST message comprising a service type information element, IE, to the network after the RRC connection is resumed, if the service request procedure is initiated for the PS service and the communication device does not transmit an IE related to the PS service other than the service type IE. a storage unit, for storing instructions; and a processing circuit, coupled to the storage unit, wherein the storage unit stores, and the processing circuit is configured to execute, the instructions of: establishing a RRC connection with a network; suspending the RRC connection, when receiving a RRC message for suspending the RRC connection; resuming the RRC connection with the network, when initiating a service request procedure; transmitting a first EXTENDED SERVICE REQUEST message comprising a service type information element, IE, to the network after the RRC connection is resumed, if the service request procedure is initiated for a packet switched, PS, service and the communication device is required to transmit an IE related to the PS service other than the service type IE; and the communication device is further characterised by not transmitting a first EXTENDED SERVICE REQUEST message comprising a service type information element, IE, to the network after the RRC connection is resumed, if the service request procedure is initiated for the PS service and the communication device does not transmit an IE related to the PS service other than the service type IE. establishing a RRC connection with a network; suspending the RRC connection, when receiving a RRC message for suspending the RRC connection; resuming the RRC connection with the network, when initiating a service request procedure; transmitting a first EXTENDED SERVICE REQUEST message comprising a service type information element, IE, to the network after the RRC connection is resumed, if the service request procedure is initiated for a packet switched, PS, service and the communication device is required to transmit an IE related to the PS service other than the service type IE; and the communication device is further characterised by not transmitting a first EXTENDED SERVICE REQUEST message comprising a service type information element, IE, to the network after the RRC connection is resumed, if the service request procedure is initiated for the PS service and the communication device does not transmit an IE related to the PS service other than the service type IE.