Motorola Corporation

Robert C Scheibel, Jr

Jeffrey C Smolinske

Phieu M Tran

Christopher L Clanton

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 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.

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Schaumburg, IL, United States of America

Robert C Scheibel, Jr