Abstract: In the event where a channel strength between UE and eNB is weakened, the eNB of the present invention may configure downlink control information into the format in which at least one of fields of pre-defined existing format is deleted, the length of a relevant field is shortened to be shorter than a pre-defined length of the relevant field, or an error correcting code is added by the amount of the length deleted or reduced. UE decodes a downlink signal according to the modified format to acquire downlink control information of its own.

Abstract: The invention uses a novel signaling protocol for conducting call waiting-caller ID messaging. Instead of waiting for an acknowledge back from the caller ID box, an acknowledge signal is generated locally at a gateway. This allows the packet switched network to meet the timing requirements of the circuit switched network. The gateway tricks the central office switch into believing an actual acknowledge signal was sent from the caller ID box. The central office switch accordingly sends the caller ID information. This ID information is then propagated across the IP network to the caller ID box.