A method of operating a communication system (100, 400) to provide access to a target wireless communication device (101-103, 401-403, 500), the method characterized by: in the target wireless communication device (101-103, 401-403, 500), transferring a naming system registration message for delivery to a naming server system (110, 600), wherein the naming system registration message indicates a domain name for the target wireless communication device and an access schedule for communication with the target wireless communication device; in the naming server system (110, 600), receiving the naming system registration message transferred by the target wireless communication device; in the naming server system, receiving an address request for the domain name for the target wireless communication device; in the naming server system, processing the domain name for the target wireless communication device and the access schedule for the target wireless communication device to respond with an address for the target wireless communication device if a current time is within the access schedule for target wireless communication device; in the naming server system, processing the domain name for the target wireless communication device and the access schedule for the target wireless communication device to respond with a timeframe to re-send the address request if the current time is not within the access schedule for target wireless communication device; wherein the timeframe comprises at least one time period when the target wireless communication device is preconfigured to access the communication system (100, 400). in the target wireless communication device (101-103, 401-403, 500), transferring a naming system registration message for delivery to a naming server system (110, 600), wherein the naming system registration message indicates a domain name for the target wireless communication device and an access schedule for communication with the target wireless communication device; transferring a naming system registration message for delivery to a naming server system (110, 600), wherein the naming system registration message indicates a domain name for the target wireless communication device and an access schedule for communication with the target wireless communication device; in the naming server system (110, 600), receiving the naming system registration message transferred by the target wireless communication device; in the naming server system, receiving an address request for the domain name for the target wireless communication device; in the naming server system, processing the domain name for the target wireless communication device and the access schedule for the target wireless communication device to respond with an address for the target wireless communication device if a current time is within the access schedule for target wireless communication device; in the naming server system, processing the domain name for the target wireless communication device and the access schedule for the target wireless communication device to respond with a timeframe to re-send the address request if the current time is not within the access schedule for target wireless communication device; receiving the naming system registration message transferred by the target wireless communication device; in the naming server system, receiving an address request for the domain name for the target wireless communication device; in the naming server system, processing the domain name for the target wireless communication device and the access schedule for the target wireless communication device to respond with an address for the target wireless communication device if a current time is within the access schedule for target wireless communication device; in the naming server system, processing the domain name for the target wireless communication device and the access schedule for the target wireless communication device to respond with a timeframe to re-send the address request if the current time is not within the access schedule for target wireless communication device; an address for the target wireless communication device if a current time is within the access schedule for target wireless communication device; in the naming server system, processing the domain name for the target wireless communication device and the access schedule for the target wireless communication device to respond with a timeframe to re-send the address request if the current time is not within the access schedule for target wireless communication device; wherein the timeframe comprises at least one time period when the target wireless communication device is preconfigured to access the communication system (100, 400).