METHOD FOR TRANSMITTING AND RECEIVING SIGNAL IN COMMUNICATION ENVIRONMENT IN WHICH MULTIPLE COMMUNICATION SYSTEMS INTERWORK, AND APPARATUS THEREFOR

摘要

A user equipment in a communication environment in which a plural communication systems interwork comprises: a processor for searching a base station of a first communication system, the base station having a signal intensity higher than a threshold; and a receiver for receiving information of a base station list of a second communication system adjacent to the terminal through a first communication system link from the searched base station of the first communication system, wherein the processor turns on a second communication system mode in the case of failing in random access channel (RACH) transmissions a predetermined number of times to the searched base station of the first communication system, wherein the receiver receives a beacon signal including an indicator which indicates support of an uplink transmission of the first communication system from base stations included in the information of the base station list of the second communication system; the processor recognizes that an uplink transmission is disabled or only a downlink transmission is enabled through the first communication system link based on the beacon signal; and the information of the base station list of the second communication system may include an indicator which indicates whether the base station of the second communication system supports a downlink (DL) or uplink (UL) transmission through the first communication system link.

主权项

1. A method of receiving a downlink signal by a user equipment (UE) in a communication environment in which a plural communication systems interwork, the method comprising:
receiving information of a list of base stations of a second communication system adjacent to the user equipment from a base station of a first communication system through a first communication system link; when quality of downlink signals received from the base station of the first communication system do not continuously satisfy a threshold a predetermined number of times,
turning on a second communication system mode based on the information of list of base stations of the second communication system; andreceiving a beacon signal or a probe response message from a base station included in the list of base stations of the second communication system through a second communication system link, the base station included in the list of base stations of the second communication system supporting downlink transmission of the first communication system; and based on the beacon signal or the probe response message, recognizing that downlink transmission through the first communication system link is impossible or only uplink transmission through the first communication system link is possible, wherein the beacon signal or the probe response message includes an indicator indicating support of the downlink transmission of the first communication system, wherein the information on the list of base stations of the second communication system includes an indicator indicating whether a base station of the second communication system supports downlink or uplink transmission through the first communication system link.