Method for a device to communicate with another device

A device, comprising:

• a memory configured to store a converged personal network service (CPNS) enabled entity set in a gateway mode, the CPNS enabled entity set in the gateway mode managing a first network and at least one entity capable of receiving a first service through the CPNS enabled entity set in the gateway mode being present within the first network;
• a controller configured to:
• determine whether a mode of the CPNS enabled entity needs to be changed from the gateway mode to a combined mode;
• operate both a gateway and a personal network entity (PNE) in order to change the mode of the CPNS enabled entity from the gateway mode to the combined mode according to a result of determining;
• compare an offset time, between a signal received on a link with the second device and a signal transmitted and received on a link with the at least one entity, to a wakeup time for receiving the signal on the link with the second device;
• and
• when the offset time is greater than the wakeup time, control synchronization between the CPNS enabled entity operating in the gateway mode and the at least one entity, in consideration of synchronization between the CPNS enabled entity operating in the PNE mode and a second device;
• and
• a transceiver configured to receive service data of a second network from the second device using the PNE operated by the controller and transmit the received service data to at least one entity belonging to the first network managed by the CPNS enabled entity using the operated gateway,
• wherein the controller is further configured to change the mode of the CPNS enabled entity from the gateway mode to the combined mode when the at least one entity belonging to the first network managed by the CPNS enabled entity is within a coverage of the second network, but cannot directly receive the service from the second device.