Method and apparatus of providing a proximity-based service for public safety with one or more user equipments out of the cellular network coverage

摘要

A method and a user equipment (UE) are described for performing a proximity-based service (ProSe) in a cellular communication system. The UE is a public safety (PS) ProSe-enabled UE that is a member of a ProSe Group. At least one UE of the ProSe Group is not served by a cellular network, and an apparatus therefore. The PS ProSe-enabled UE checks whether it is in a location served by the cellular network, and transmits first information related to the ProSe Group to the cellular network if a condition is satisfied. The PS ProSe-enabled UE transmits a notice to a leader UE of the ProSe Group for informing that the PS ProSe-enabled UE is in a state that can be served by the cellular network when the PS ProSe-enabled UE is in the location served by the cellular network as a result of the check operation.

主权项

1. A method of performing a Proximity-based Service (ProSe) by a Public Safety (PS) ProSe-enabled User Equipment (UE) in a cellular communication system, wherein the PS ProSe-enabled UE is a member of a ProSe Group, the method comprising:
triggering a check operation for checking whether the PS ProSe-enabled UE is in a location served by the cellular network when there is first information related to the ProSe Group to be conveyed to the cellular network and any member of the ProSe Group is not in the location served by the cellular network; transmitting a notice to a leader UE of the ProSe Group for infoiiiiing that the PS ProSe-enabled UE is in a state that can be served by the cellular network when the PS ProSe-enabled UE is in the location served by the cellular network as a result of the check operation; running a timer at a time when the notice is transmitted to the leader UE; and receiving a first control signal from the leader UE as a response to the notice, wherein the first control signal instructs the PS ProSe-enabled UE to convey the first information from the ProSe Group to the cellular network, wherein if the first control signal is received on or before the timer expires, the first information is conveyed from the ProSe Group to the cellular network according to the first control signal, and wherein if the first control signal is received after the timer expires, the first control signal is ignored and the first information is not conveyed from the ProSe Group to the cellular network.