Ericsson Gmbh

Leonard Lee

Dayong Chen

Evin Feli

A wireless communications system receiver classifies a received burst as a DTX-high state normal burst or a DTX-low state truncated burst with a high probability of success. D1, the Euclidean distance between the known CDVCC and the bit position of CDVCC in a normal burst, is determined by calculating a confidence-weighted correlation between the two bit patterns. In a high-noise environment, D2, the Euclidean distance between the known CDVCC and the bit position of CDVCC in a truncated burst, is calculated. The ratio D1/D2 is compared to a threshold to classify the DTX state of the received burst. D1 and D2 may be normalized by dividing by the maximum average RSSI over the received burst, plotted on a graph of normalized D1 vs. normalized D2, and compared to a predetermined thresholding function that minimizes the probability of false classification. The thresholding function may be a piece-wise linear curve.

DTX detection method with high success probability

Method and apparatus for distributing traffic in a wireless packet data network. A capacity flag which is sent on each RF data channel within a cell in a wireless packet data network is toggled between an asserted and an unasserted state according to the period of a timer. Transceiver terminals will only register for a channel while that channel's capacity flag is unasserted; therefore, transceiver terminals register with the various RF channels in a cell in a distributed fashion over time. The invention can be implemented by a computer program product or logic, or a combination of the two installed at the base station for a cell within a wireless data network such as a CDPD network.

Method and apparatus for distributing traffic load in a wireless packet data network

A method and device(s) for increasing the Cellular Digital Packet Data (CDPD) user data rate between a mobile terminal and a basestation in a digital cellular mobile communications system. The method and device(s) use the same modulation scheme that is used for digital speech to encapsulate CDPD block data, specifically, the TIA/EIA-136 standard. The TIA/EIA-136 standard can accommodate more data than the GMSK modulation scheme that is typically used for CDPD block data. In order to encapsulate CDPD block data using the TIA/EIA-136 standard, an encoding step is performed on the sending end that includes constructing a CDPD block comprised of CDPD data, assembling an TIA/EIA-136 frame leaving the data fields of the frame empty, and placing CDPD block data in the data fields. The assembled TIA/EIA-136 frame is then sent using existing transmission code. To unpack the CDPD block data, a decoding step is performed on the receiving end that includes receiving the TIA/EIA-136 frame comprised of CDPD data in the data fields of the TIA/EIA-136 frame, and re-constructing the CDPD block from the data fields. Once re-constructed, the CDPD block is forwarded to existing CDPD upper layer code for further processing.

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Cary, NC, United States of America

Leonard Lee