Motorola Corporation

Phieu M Tran

Jeffrey C Smolinske

Christopher L Clanton

Robert C Scheibel, Jr

Naveen Aerrabotu

Jerome O Vogedes

A method in a wireless communication device including receiving contact information with a signature from a source () not on a trusted contact list, validating () the signature by comparing the signature to an reference signature stored on the method in a wireless communication device, and updating () the trusted contact list regarding the contact information received if the signature is valid. In some applications, the contact information and signature is associated with a wireless communication device provisioning session request message.

Contact validation and trusted contact updating in mobile wireless communications devices

The present invention provides a method (500), device (400), microprocessor (500) and microprocessor memory (400, 500, 600) for instantaneous preemption of packet-switched data from a user that has won contention for a channel and for transmitting on a time slot, by higher priority traffic type data or voice in a TDMA communication system having a central access manager and a plurality of subscriber units. Before transmitting a packet on an uplink channel, the subscriber unit first selects a time slot and contends for channel access on the time slot. Upon gaining access to the uplink channel, the subscriber unit begins transmitting segments of a data packet on the selected time slot, suspending transmission when a higher priority user gains access to the time slot and, where decoding fails, suspending transmission for the time slot. The subscriber unit continues to transmit on the selected time slot until the packet ends.

Method, device, microprocessor and microprocessor memory for

The method and device of the present invention provide for efficient error correction in a packet radio system by 1) eliminating wasted bandwidth due to the unnecessary retransmissions that occur as a result of lost positive acknowledgments, 2) occupying less downlink bandwidth than a scheme requiring positive acknowledgments, and 3) minimizing packet delay by providing two levels of error correction at the datalink layer.

Method and device for efficient error correction in a packet-switched

The present invention provides a fair and efficient method (1000), device/microprocessor (500, 600) and computer software for utilizing the downlink channel in a TDMA packet-switched communication system supporting both single slot subscriber units and multiple slot subscriber units which both use the same air-interface protocol.

Method, device/microprocessor, and computer software for providing

The present invention provides a method (400, 500, 600, 700, 800, 900, 1000) and device (1100, 1200, 1300) for contention for channel access to single-slot subscriber units that are capable of transmitting and receiving data on one time slot per TDMA frame, allowing contention for channel access on any one of the available packet time slots and transmission on the time slot where contention is won. Thus, the present invention eliminates a requirement for a subscriber unit to be assigned to a particular time slot for contention, thereby eliminating the problem of performing load balancing on the time slots.

Method and device for channel contention and data transmission for

A novel scheme efficiently indicates to a plurality of users which user has been granted access to a multi-access packet channel. Transmission and reception of a predetermined limited number of echo bits per timeslot reduces bandwidth usage, and over the duration of a packet, these bits are equivalent to a variable length random identification number which is used for identifying which user has been granted access.

Method and system for resolution of channel access in data transmission

The present invention provides a unique access control scheme for assigning a plurality of time slots in a fair manner among subscriber units using a single time slot in a frame and subscriber units using multiple time slots in a frame in a communication system.

Method and device for controlling time slot contention to provide

Collision avoidance is maximized by placing collision avoidance scheduling in a central access manager. The central access manager coordinates downlink transmissions of a base site with the uplink transmissions by subscriber units, virtually avoiding collisions of the two types of transmissions. The subscriber units utilize a waiting period prior to transmission of packets to permit the central access manager to maintain the scheduling.

Method and system for providing uplink/downlink collision avoidance in a

The present invention provides a method and system of statistical estimation of uplink traffic using a retry count. A unique spread factor is used for spreading retransmission evenly among backlogged subscriber units, thereby providing dynamic control of the retransmission spread based on the estimated uplink traffic.

Method and system for efficiently optimizing throughput and minimizing

The method reduces transmission delay by using a selective-repeat automatic repeat request, ARQ, error detection scheme in a packet-switched data communication system. The invention provides a method for a subscriber unit to transmit acknowledgment information using a contention-free channel access scheme in addition to providing for a base site control unit to interrupt a packet currently being transmitted in order to retransmit segments of the packet when the segments have errors.

Method for providing error correction using selective automatic repeat

Data transmission with bit synchronism over an unreliable channel is accomplished by assigning a unique number to each data byte transmitted in a data packet. From this unique number, each data bit may be identified at the packet receiver. When a data packet is missing or uncorrected, the missing data bits are identified and a fill data bit is supplied to the data sink at the time each missing data bit would have been supplied.

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Lincolnwood, IL, United States of America

Phieu M Tran