Patent ID: 9307575
Filing Date: 2016-04-05
CPC Classification: H04W,Y02D

Claim Text:
1. A method of performing a procedure for a Proximity-based Service (ProSe) by a first ProSe-enabled User Equipment (UE) served by a base station in a cellular communication system, the method performed by the first ProSe-enabled UE and comprising: receiving system information including authorization of announcing network reachability information from the base station and a number of UE relaying hops allowed from the first ProSe-enabled UE; measuring a Pa which is a strength of downlink signals received from the base station; checking whether the first ProSe-enabled UE is near a cell boundary of the base station; performing a procedure for broadcasting the network reachability information only when the first ProSe-enabled UE determines that the first ProSe-enabled UE is near the cell boundary of the base station, wherein the network reachability information includes a hop count used to indicate a maximum number of the number of UE relaying hops allowed; and receiving, from a second ProSe-enabled UE which is an out-of-coverage ProSe-enabled UE, a request for connecting with the base station via the first ProSe-enabled UE, wherein the first ProSe-enabled UE determines that the first ProSe-enabled UE is near the cell boundary of the base station when the Pa is lower than a first threshold value for a predetermined period.