Patent ID: 6169882
Filing Date: 2001-01-02
Classification: G08B

Abstract:
A radio pager for receiving a paging signal addressed to the pager, the paging signal containing a message which may be accompanied by a source identifier identifying a source from which the paging signal has originated, comprising: a first memory for storing a plurality of source identifiers; a second memory; and control circuitry for determining whether the message is accompanied by one of said source identifiers stored in the first memory, storing said message into the second memory as one of: 1) a normal message if the message is not accompanied by the stored source identifier and 2) an important message if the message is accompanied by the stored source identifier, and labeling the stored messages as one of: 1) read messages and 2) unread messages depending on whether the messages stored in the second memory are one of read and unread by a user, monitoring time lapse of each of the unread messages, and relabeling one of the unread messages as a read message when the time lapse of said one unread message exceeds a predetermined value, said control circuitry being configured to remove, from said second memory if the second memory is full, a) an oldest read message if the second memory contains at least one read message, b) an oldest unread normal message if the second memory contains at least one unread normal message, c) an oldest one of important messages accompanied by mutually different source identifiers if the second memory contains only important messages, and d) an older one of important messages all accompanied by a plurality of same source identifiers if the second memory contains only important messages.