Motorola Corporation

Other

Certicom Corporation

Motorola Mobility LLC

Douglas I Ayerst

Malik J Khan

Leonard E Nelson

Michael James Rudowicz

Jheroen Pieter Dorenbosch

Stephen Rocco Carsello

Gregory L Cannon

Warren P Glotzbach

Jyh-Han Lin

Morris A Moore

Zhonghe Wang

James Alan Starkweather

Robert Gary Goodman

Leo G Dehner, Jr

Kwok Keung Choi

Walter Lee Davis

Scott Alexander Vanstone

Walter L Davis

Robert J Schwendeman

William J Kuznicki

Brian J Budnik

Kwok K Choi

Richard A Hill

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.

Communication system and method for securely communicating a message between correspondents through an intermediary terminal

A method for re-establishing communication between a base station ( ) that transmits on a forward channel, and a subscriber unit ( ) that has temporarily lost the forward channel, uses the concept of a re-registration interval. The base station ( ) transmits, to subscriber units ( ) 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 ( ) is programmed to operate as a subscriber unit that uses the re-registration interval.

Selective call transceiver and method of re-registering same

A method is provided for background scanning in a selective call communication system ( ) having a plurality of channels ( ), wherein a selective call device ( ) has designated thereto one of an odd and even frame compulsory decoding schedule. The selective call device ( ) decodes system configuration information (SCI) on odd SCI frames during the odd compulsory decoding schedule, scans for even SCI frames of target channels while maintaining the odd compulsory decoding schedule, and releases or maintains the odd compulsory decoding schedule based on the system configuration information found on the target channels.

Method and apparatus to enable background scanning

A method in a communication system (100) having at least a first and a second base stations (104, 108) for communicating with selective call devices (102) includes the steps of transmitting a first signal on a first frequency that indicates an alternate frequency and transmitting second signal on the alternate frequency indicated by the first signal. The second signal has a registration threshold for controlling registration of the selective call device (102) with the second base station (108).

Communication systems for controlling registration of selective call

A communication system (10) has a plurality of selective call transceivers (30) which operate as one-way selective call receivers in one-way coverage zones (16) where no registration is required or operate as selective call transceivers in two-way coverage zones (36) where registration is required or operate in one-and-a-half way zones where registration is attempted but not required for the selective call transceiver to receive outbound messages. The system further comprises a plurality of outbound transmitters (17, 18, and 19) covering one-way coverage zones (12, 14, and 16 respectively) and a plurality of base receivers (37, 38, and 39) and transmitters (11, 13, and 15) covering two-way coverage zones (32, 34, and 36 respectively). The one-and-half-way zone is primarily a mode of operation useful in areas having 'spotty' inbound coverage and is not necessarily designated by a geographic location.

Method and apparatus for partial coverage zone selective call

A two-way wireless selective call communication system (20) using a synchronous time division multiplex communication protocol transmits messages divided into a plurality of data units (120, 126, and 128) from a plurality of selective call transceivers (32) to a paging terminal (33) during time slots (78), the number of data units and the time slots are set by the paging terminal controller (26) based on information, including size of the message information, received in an unscheduled transmission from each of the plurality of selective call transceivers. The paging terminal transmits to a selective call transceiver a multi-bit acknowledgment message having a one-bit acknowledgment for each of the plurality of data units. A selective call transceiver re-transmits data units not recovered by the terminal based upon content of the acknowledgment message. More than one selective call transceiver transmit during a one time slot set by the terminal.

System controlled asymmetrical automatic repeat request protocol

A selective call receiving device (10) such as a pager is controlled to dynamically change a base frame assigned to the device and subsequent control frames derived therefrom. The time that the device is operative to look for its address in a received signal can thus be dynamically changed to improve the efficiencies of a mixed systems environment without substantially reducing the battery life of the selective call receiving device (10). In two embodiments of the invention a new base frame for the device is derived from an originally assigned base frame that is stored in the selective call receiving device. In another embodiment, a new base frame for the device is derived from the device's address along with frame management information that is received by the selective call receiving device.

Method for dynamically changing control frames for selective call

A method and apparatus allocates a first predetermined plurality of frame time slots (102) to a first protocol, and allocates a second predetermined plurality of frame time slots (102) to a second protocol having a base frame management capability. The base frame management capability is applied such that portable selective call receiving devices (10) utilizing the second protocol normally perform battery saving throughout the first predetermined plurality of frame time slots (102).

Method and apparatus for mixing protocols in a radio messaging system

In a system controller (102) a quantity of control channels is determined; a portion (344) of a code word (338) is set to identify the quantity of control channels; the code word (358) is transmitted in a predetermined portion (332) of each of a plurality of radio signals. In a multichannel radio (106) a receiver (610) is set to a first channel which includes one of the plurality of radio signals; the portion (344) of the code word (338) is decoded; one of the set of control channels is identified as a new home control channel, the home control channel is revised to the new home control channel, and the receiver (610) is set to the home control channel as revised. The one of the set of control channels is identified based on the quantity of control channels and a predetermined number in the multichannel radio (106).

Method and apparatus for receiving a radio signal within a home control

System controlled asymmetrical automatic repeat request protocol method

A system controller (102) generates and transmits a radio signal having long messages in data frames (370), and short and long messages in control frames (360). A set of selective call radio addresses is included at the beginning of a control frame (360), each selective call radio address including a subvector which indicates the starting position of a short message or a vector packet within the control frame (360). Vector packets indicate starting positions of long messages within the control frame (360), within other control frames (360), and within data frames (370). A selective call radio (106) receives the radio signal and recovers and processes the short and long messages, using the subvectors and vectors to identify the positions of the short and long messages.

Method and apparatus for organizing and recovering information

A central controller (10) controls the operation of a code division multiple access (CDMA), spread spectrum communication system, which includes base stations (15) and portable transceivers (20) for communicating with the base stations (15). The central controller (10) stores a plurality of seeds, which are used by the portable transceivers (20) in generating pseudo-noise (PN) sequences, and, in response to requests from base stations (15), the central controller (10) distributes at least a portion of the assignable seeds to each of the requesting base stations (15). The base stations (15) that have received seeds from the central controller (10) subsequently transmit the seeds over the air to the portable transceivers (20) within their respective coverage areas. The portable transceivers (20) then utilize the seeds to generate spread spectrum signals for reception by a closest base station (15) having a coverage area in which they are located.

Code division multiple access (CDMA) inbound messaging system utilizing

A method and apparatus transmit (502) from a controller (112) a message element (416) and an indication (418) of a signal quality threshold corresponding to the message element. A receiver (122) receives (504) the message element and the corresponding indication of the signal quality threshold, and measures (506) a received signal quality experienced while receiving the message element. The receiver completes (512, 514) a negative response to the message when the received signal quality is worse than the signal quality threshold, and a positive response to the message when the received signal quality is not worse than the signal quality threshold. The message element is defined as one of (a) the message in its entirety and (b) a portion of the message.

Method and apparatus for controlling how a receiver responds to a message

A selective call receiver (106) has a frequency synthesizer (708) for scanning a plurality of frequencies to determine a control channel to receive a signal and a receiver (704) for receiving the signal representative of an available frequency associated with a geographic region. The signal includes a channel identifier (404), a frequency assignment (406) and an active channel indicator (408). A processor (712) associates the channel identifier (404) with the frequency assignment (406) in response to the active channel indicator (408) indicating an available frequency of the geographic region and a memory (720) stores channel identifiers (404) associated with frequency assignments (406) designating available frequencies (408). The receiver (704) receives an address (333) and the channel identifier (404) on the control channel, a decoder (714) decodes the channel identifier (404) associated with the frequency assignment (406) to determine the available frequency where a message will be transmitted and the frequency synthesizer (708) switches to the available frequency indicated by the channel identifier (404) for receiving the message.

Method for determining available frequencies in selective call receivers

A fixed system receiver (107) operates in a synchronization mode which is one of a synchronous mode and an asynchronous mode. A system controller (102) transmits a response command which includes a preamble indicator corresponding to the synchronization mode of the fixed system receiver (107). A selective call radio (106) receives and decodes the preamble indicator and generates a response message data unit (312). The synchronous header data packet (660) is preceded by a synchronizing packet (650) when the preamble indicator indicates the asynchronous mode and is not preceded by the synchronizing packet (650) when the preamble indicator indicates the synchronous mode. The selective call radio (106) transmits the response message data unit (312). The fixed system receiver (107) acquires symbol recovery timing and synchronizes to data packet boundaries of the response message data unit (312), using the synchronizing packet (650) when included.

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Delray Beach, FL, United States of America

Douglas I Ayerst