公开(公告)号：EP1325586A2

公开(公告)日：2003-07-09

申请号：EP01973936.6

申请日：2001-10-05

Applicant: Certicom Corp. ,  MOTOROLA, INC.

Inventor： VANSTONE, Scott, A. ,  DAVIS, Walter, Lee ,  AYERST, Douglas, I.

IPC: H04L9/32

CPC classification number: H04L9/3247 ,  H04L9/321 ,  H04L9/3263 ,  H04L2209/56 ,  H04L2209/80 ,  H04W12/06 ,  H04W12/10

Abstract: A wireless communication system includes a pager or similar device that communicates to a home terminal. The home terminal confirms the identity of the pager and attaches a certificate to the message for ongoing transmission. Where the recipient is also a pager, an associated home terminal verifies the transmission and forwards it in a trusted manner without the certificate to the recipient.

公开(公告)号：EP0775397B1

公开(公告)日：2003-07-02

申请号：EP95928188.2

申请日：1995-07-28

Applicant: MOTOROLA, INC.

Inventor： AYERST, Douglas, I. ,  BUDNIK, Brian, J. ,  KAHN, Malik, J.

IPC: H04J3/16 ,  H04Q7/20

CPC classification number: H04W84/025 ,  H04W88/185

Abstract: A fixed system receiver (107), which includes a forward receiver (305), a reverse receiver (310), and a response timer (215), is for use in a radio communication system (100) having a forward radio channel and a reverse radio channel. A command is transmitted in a forward channel radio signal to a selective call transceiver. The forward receiver (305) is for receiving, demodulating, and decoding the command. The reverse receiver (310) is for receiving and demodulating the reverse channel radio signal. The response timer (215), which is coupled to the forward receiver (305) and the reverse receiver (310), is for determining a response period beginning substantially at a scheduled response time included in the command and having a duration which is substantially a designated length of the data unit included in the command, and for generating a control signal which enables the reverse receiver (310) during the response period.

公开(公告)号：EP1088459A1

公开(公告)日：2001-04-04

申请号：EP99925868.4

申请日：1999-05-26

Applicant: MOTOROLA, INC.

Inventor： OHEL, Hagai ,  AYERST, Douglas, I.

IPC: H04Q7/00 ,  H04B7/212 ,  G05B23/02

CPC classification number: H04W84/025

Abstract: A method for coordinating an inbound channel in a selective call communication system (100) includes the steps of encoding (702) an expected time for an inbound response and a number of bits in the inbound response with an outbound message requesting information from a selective call device; transmitting (704) the outbound message to the selective call device; allocating (706) an inbound channel; determining (708) the number of bits to be encoded in at least one time slot of the inbound channel; transmitting (710) the inbound channel, the number of bits to be transmitted in the at least one time slot to the selective call device; encoding (712) the information being requested on the inbound channel with the number of bits in the at least one time slot; and transmitting (714) the inbound response on the inbound channel with the number of bits specified for each of the at least one time slot.

公开(公告)号：EP0865709A1

公开(公告)日：1998-09-23

申请号：EP96938758.0

申请日：1996-11-04

Applicant: MOTOROLA, INC.

Inventor： AYERST, Douglas, I. ,  GOODMAN, Robert, Gary ,  STARKWEATHER, James, A.

IPC: H04W8 ,  H04B7 ,  H04W84 ,  H04W60 ,  H04W88

CPC classification number: H04W84/025 ,  H04W60/04 ,  H04W88/185

Abstract: A method for re-establishing communication between a base station (102) that transmits on a forward channel, and a subscriber unit (108) that has temporarily lost the forward channel, uses the concept of a re-registration interval. The base station (102) transmits, to subscriber units (106, 108) in its area, a signal indicating the duration of a re-registration interval. A subscriber unit that has temporarily lost the forward channel determines whether the duration of such loss exceeds the re-registration interval. If the interval is exceeded, the subscriber unit sends a re-registration signal to the base station on a reverse channel. A selective call transceiver (400) is programmed to operate as a subscriber unit that uses the re-registration interval.