Title:
【発明の名称】無線選択呼出受信機
Document Type and Number:
Japanese Patent JP2872057
Kind Code:
B2
Abstract:
In a radio pager for receiving a paging signal of a superframe structure comprising a recurrent series of frames each containing a series of burst signals containing a synchronization field, a frame number field and an address field, one of the frames in each superframe being assigned to the pager. The pager comprises a receiver and a synchronizer connected to the receiver for establishing synchronization to a bit sequence in the synchronization field. A short warm-up period and a short time-out period are established before each of the burst signals of the assigned frame of a first superframe are received and a long warm-up period and a long time-out period are established before the burst signals of the assigned frame of a second superframe are received. The receiver is activated at the start of the short warm-up period advanced from the start of each burst signal of the assigned frame and a determination is made on whether synchronization is established within the subsequent short time-out period. If synchronization is not established, the receiver is deactivated at the end of the short time-out period, and if established, the receiver is deactivated after the end of the short time-out period. A long warm-up period and a long time-out period are then established and the receiver is deactivated. The receiver is reactivated at the start of the long warm-up period advanced from the start of the assigned frame of a second superframe, and determination is made on whether synchronization is established within the long time-out period. If synchronization is established, the receiver is deactivated at the end of the long time-out period, and if established, the receiver is deactivated after the end of the long time-out period. The short warm-up and short time-out periods are established again for reception of successive burst signals .
Inventors:
AOSHIMA TAKASHI
Application Number:
JP31401194A
Publication Date:
March 17, 1999
Filing Date:
November 24, 1994
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H04B7/26; H04B1/16; H04W52/02; H04W88/02; (IPC1-7): H04Q7/18
Domestic Patent References:
| JP5185603A |
Attorney, Agent or Firm:
Naoki Kyomoto