Abstract: In a method of tracking on-time errors in a wireless communication system, first and second metrics may be produced from accumulated signal samples of a received data frame, and a sum of, and a difference between, the first and second metrics may be calculated. The calculated difference and sum values may be used to determine an estimated on-time error for the received data frame and a corrected timing error control value to be applied to the on-time error. The accuracy of the estimated on-time error may be evaluated based a signal quality metric to determine whether the corrected timing error control value is to be applied to the estimated on-time error or whether the timing adjustment for the on-time error is to be stopped.

Abstract: In a method of multipath acquisition for a dedicated traffic channel, path positions of the traffic channel that have desired signal energy for processing in a base station receiver may be determined as a function of pilot signal information and other control information contained in a control part of the traffic channel.

Abstract: A method for transmitting to a user terminal of a wireless communication network includes the determination of a transmit power for the message to be transmitted. The transmit power includes a margin that is determined adaptively. In specific embodiments of the invention, the margin is adapted in response to a measurement of the frequency of error events so as to urge such frequency below a specified upper bound.

Abstract: The need for separate CRC bits is eliminated by taking advantage of what has been determined to be an embedded error detection capability of the tail bits generated by the constituent encoders of a turbo coder to perform error detection following turbo decoding. Specifically, it has been recognized that the tail bits are similar to CRC bits that would be generated by a CRC encoder that uses as its generating polynomial the feedback polynomial used by the turbo encoder. At the turbo decoder, after a final turbo decoding iteration cycle, a check is performed on the decoded systematic information bits by calculating the tail bits from the decoded information bits using that generating polynomial and bit-by-bit comparing the calculated tail bits with the systematic tail bits decoded by the turbo decoder. If a mismatch occurs at one or more bit positions, an error is indicated and the packet is marked as having failed.

Abstract: The need for separate CRC bits is eliminated by taking advantage of what has been determined to be an embedded error detection capability in a turbo code itself to perform error detection following turbo decoding. Specifically, since the two constituent encoders of a turbo encoder that are used to encode a data packet produce two systematic codes that share the same systematic bits one code, one is used to serve as the parity check for the other. The sign of the log likelihood ratio (LLR) of each systematic bit in a block of decoded data calculated at the end of a turbo decoding cycle is compared with the sign of the LLR of each corresponding bit that was calculated at a previous turbo decoding cycle. If the signs of the LLRs for each comparison do not agree, then a packet error is determined to have occurred; otherwise no packet error is detected.

Abstract: The channel quality indicator (CQI) transmitted by a mobile terminal to a base station is indicative of the Ec/Nt pilot SNR of the pilot signal transmitted by the base station and measured by the mobile terminal. The base station uses the CQI for purposes such as determining a downlink rate, a modulation scheme, and downlink power. Knowledge by the base station of whether the received and detected CQI is likely to be “good” or “bad” would be useful in determining how and whether the value of the received and detected CQI should be used. In a first embodiment, at the base station, a reliability of the received CQI that is detected from received soft symbol metrics is determined in conjunction with the detected CQI value for the received CQI word as a whole.

Abstract: A decoding method is carried out in a receiver configured to accept format information relating to sequences of input data, to use format information in the decoding of each input sequence, and to issue an acknowledgement signal in the event that an input sequence is successfully decoded. The method involves receiving a format message which pertains to a new input sequence, searching a candidate set of format indices for that index which best satisfies a criterion for matching to the format message, and selecting that index which gives the best match. Before searching, the receiver reads the acknowledgement signals that were issued in response to the decoding or attempted decoding of recent input sequences. If the acknowledgement signals satisfy an appropriate condition, the search is limited to fewer than all the indices in the candidate set. The format information that corresponds to the selected index is used in decoding the new input sequence.

Abstract: At a base station receiver in a CDMA wireless communications system, in order to reduce reliance on the parameter values transmitted on a packet data control channel (PDCCH) to properly detect the high speed packet data transmitted on a packet data channel (PDCH) with which the PDCCH is code-division-multiplexed, data detection is performed using different possible values for at least one of the parameters and determining if a data packet derived from the PDCH detected under the different values produces a detected data packet that passes a CRC check. If a data packet derived from the received PDCH using a possible parameter value passes the CRC check, then the data packet is delivered to the output and an ACK is transmitted back to the transmitting mobile terminal.

Abstract: The present invention provides a method and apparatus for an intelligent antenna receiver architecture. The method includes receiving a first plurality of signals corresponding to a plurality of antennas, determining at least one value indicative of a non-random portion of the first plurality of signals, and modifying the first plurality of signals based upon the at least one value indicative of the non-random portion of the first plurality of signals to form a second plurality of signals.

Abstract: In the absence of a continuous channel from the mobile terminal that incorporates a CRC in each transmitted frame from which the base station can derive a power control signal for feedback to the mobile station for maintaining the mobile station's pilot Eb/N0 level at a desired target that corresponds to a particular frame error rate, the pilot signal received by the base station from the mobile terminal itself is arranged in a frame format. Each pilot frame is compared with an a prioi known transmitted pilot signal bit pattern to determine whether it has been received in error. In response to a comparison of a received pilot frame with the expected known bit pattern of the pilot frame, an error signal is derived, which in the described embodiment is either a step-up or step-down signal that is fed back to the mobile terminal to increase or decrease its transmitted pilot Eb/N0 level, respectively.

Abstract: A decision as to whether a mobile terminal has transmitted an ACK, a NACK or a NULL from a received signal at a base station is made by successively eliminating one of the three possible transmitted symbols by sequentially applying decision rules that maximize network throughput by minimizing the sum of the weighted costs of making a decision based on the magnitude of the received signal.

Abstract: A method and apparatus for detecting discontinued transmission (DTX) frames in data frames received over a link or channel, is described, where a DTX frame is a frame that does not carry data and which is transmitted with zero power over the link or channel. The method and apparatus determines whether a received data frame is a DTX frame based on a plurality of metrics. Based on the metrics, the method and apparatus may effectively discriminate a case where a data frame is received as an erasure (e.g., data frame received with errors), and a case where a transmitted data frame is received as a DTX frame.

Abstract: A method and apparatus for detecting discontinued transmission (DTX) frames in data frames received over a link or channel, is described, where a DTX frame is a frame that does not carry data and which is transmitted with zero power over the link or channel. The method calculates a data rate of a channel over which data frames are being transmitted, sets a threshold based on the data rate, and determines whether a received data frame is a DTX frame based on the threshold. The apparatus can effectively discriminate a case where a data frame is received as an erasure (e.g., data frame received with errors), and a case where a transmitted data frame is received as a DTX frame.

Abstract: We disclose a method of dynamic channel assignment for wireless transmission systems that employ time or frequency multiplexing, or both time and frequency multiplexing. The invention is specifically addressed to the problem of avoiding interference in the channels of such systems. In a broad aspect, the invention involves partitioning base stations of a network into non-interfering sets. Channels are allocated to the non-interfering sets according to need. Stages of channel reallocation take place periodically. The reallocation takes place through coordinated activity by the base stations. That is, the channel reallocation is carried out in response to information that is exchanged between base stations, or it is centrally directed by the network in response to information passed to the network by the base stations.

Abstract: A method of calculating a power threshold for a secondary communication channel capable of operating in DTX mode in forward or reverse links so that the communication channel is prevented from entering a deadlock state. Power threshold information for an associated primary channel and the secondary channel are used to update the established power threshold for the communication channel. The updated power threshold for the communication is thus calculated by combining previously established thresholds for the communication channel and associated primary channel with a current established threshold for the associated primary channel.