Patents Examined by Curtis Kurtz
  • Patent number: 5434905
    Abstract: A cordless telephone set comprises a base unit and a handset unit connected by a radio frequency (RF) link which is established by digital burst data transmission and is synchronized by a unique word which is included in the digital burst data. The radio transmission signal is not continuous and it requires the synchronization. The unique word is detected by the unique word detecting means and is used to establish the burst data synchronization. The unite word consists of frequency channel information and fixed unite data. By using this information, the base unit and the handset unit are prevented from trying to establish a radio link at incorrect frequency when a spurious signal, not intended for the base unit and/or handset unit is erroneously received.
    Type: Grant
    Filed: November 30, 1993
    Date of Patent: July 18, 1995
    Assignee: Uniden Corporation
    Inventors: Kazuo Maeda, Masayasu Fujino, Jun Yang, Kiyoshi Tanaka
  • Patent number: 5317623
    Abstract: A method of handover and route diversity in a mobile radio communication which is less time consuming and capable of improving the frequency spectrum utilization efficiency and securing the high quality of service regardless of the moving speed of the mobile station. In the method, a loop transmission line by which each base station is connected with neighboring base stations is provided; a handover information is transmitted through the loop transmission line, where the handover information is relayed by each base station from one of the neighboring base stations to another one of the neighboring base station; and the handover of a communication of a mobile station from one traffic channel of one base station to an idle traffic channel of another base station is carried out by using the handover information transmitted through the loop transmission line. The method can also be applied to a route diversity reception.
    Type: Grant
    Filed: October 2, 1991
    Date of Patent: May 31, 1994
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Masayuki Sakamoto, Masaharu Hata