Abstract: A system and method of performing interference analysis among cells in a telecommunications network. For any given cell and a plurality of neighboring cells, a plurality of traffic/disturbance event correlations as a function of call activity in the neighboring cells and disturbance activity in a given cell are computed. Call Event Recording (CER) and Radio Disturbance Recording (RDR) correlations are then compiled in a table and utilized in quantifying the probability of false event correlations occurring from random matches via an estimation algorithm. As such, the accuracy of interference analysis based on traffic/disturbance event correlations is estimated, using the probability of false event correlations to confirm that call activity in one or more of the offending cells is likely to be the cause of the interference in a given cell.

Abstract: A method and system of optimizing the signal strength and interference characteristics of a wireless telecommunications network which includes a plurality of cells with at least one of the cells being disturbed (the “disturbed cell”) by events occurring in one or more offending cells. The method comprises the step of computing a distribution of disturbance events in the disturbed cell as a function of disturbances created by the offending cells. The distribution of disturbance events is then utilized to predict changes in coverage of the offending cells as changes in the carrier-to-interference (C/I) ratio of the disturbed cell are made. Such predictions then lead to modifying the power levels of wireless components in the network to reach acceptable tradeoffs between interference and coverage. Thus, the tradeoff is a function of the predicted changes in C/I and acceptable coverage and interference thresholds for the network.

Abstract: A telecommunications system and method is disclosed for employing an improved self-adaptive maximum likelihood sequence detection technique using a T-algorithm and its variants in order to reduce signal distortion in cellular networks. If the noise variance is known, the T-algorithm computes the metric for all the branches in the stack and computes an expected value of the desired metric. Each branch not within a small, predefined deviation from the desired metric is discarded. However, if the noise variance cannot be reliably estimated, the T-algorithm used is similar to the previously described T-algorithm, except that the comparison is with the overall best path with the minimum metric. In other words, the path with the minimum value of the metric is computed and all paths within the small, predetermined deviation of this metric are retained and the remaining are deleted from the stack.

Abstract: A system and method of identifying the source of uplink and downlink interference in a disturbed cell of a wireless telecommunications network. Initially, call events occurring in offending cells are recorded. In conjunction, the disturbance events occurring in the disturbed cell of the telecommunications network are recorded. The recorded call events with recorded disturbance events are then correlated. A distribution of disturbed and offending cells within the telecommunications network as a function of time is computed to obtain a statistical correlation of call events in offending cells and subsequent disturbances resulting in the disturbed cell to identify the possible source of disturbances that caused the sealing of the sealed device with in the disturbed cell.

Abstract: A method of assigning a channel to a service in a wireless communications network based on interferences levels and channel quality. Channels are preassigned and then reassigned using an algorithm that assigns a channel to a service based on uplink interference and channel quality measurements. Reassignment can be achieved in one processing pass, rather than requiring multiple iterations.

Abstract: A method and system for determining sources of downlink interference in a telecommunications network having offending cells and disturbed disposed therein. Initially, mobile traffic events in offending cells within the telecommunications network are identified. Disturbance events in disturbed cells within the telecommunications network are also determined. The identified mobile traffic events are then correlated with the identified disturbance events in order to detect possible sources of disturbance within the telecommunications network. A disturbance distribution for each disturbed cell within the telecommunications network is thereafter computed, when all identified mobile traffic events are correlated with the all identified disturbance events, thereby enabling network engineers to optimize the telecommunications network by minimizing downlink interference.

Abstract: A telecommunications system and method is disclosed for assigning channels based upon interference and channel quality measurements. The interference level measurements are carried out on the uplink of the cellular network. Channels are categorized in accordance with interference bands depending upon the interference levels. Incoming service is pre-assigned to a channel in the highest available interference band and a channel quality measurement (CQM) is conducted. The service is either continued (assigned) on the same channel, reassigned to a channel with lower interference or dropped if no other channel with lower interference is available based upon the channel quality measurement and the interference bands having available channels.

Abstract: A method (40) and device (42) for assigning transmission channels in a wireless communications network (38). The frequencies of the network (38) are discriminated to determine which transmission channels have a predetermined blocking threshold of interference. A transmission channel is preassigned with a channel quality less than the predetermined blocking threshold of interference to an incoming call. The channel quality and interference level of the preassigned transmissions channel are continually monitored, and another transmission channel is assigned to the call when the monitored levels of channel quality and interference levels change beyond a set of predetermined thresholds. Forward and backwards channel reassignments are performed depending on the channel quality and interference levels.

Abstract: A telecommunications system and method is disclosed for analyzing the speech quality, e.g., the Bit Error Rate (BER), on the forward and reverse links to determine whether the links are balanced. For a target cell, the BER on the forward and reverse links can first be measured. The determination of whether the links in the target cell are balanced depends upon whether the BER percentage is known or only the BER class information is available. If the BER percentage is known, the relative difference of the mean BER on the reverse and forward links can be compared to determine the degree of the balance. However, if only the BER class is available, the relative distribution of occurrences of the BER classes on the reverse and forward links can be analyzed to determine whether the links are balanced. The analysis of the path balance can also be used to benchmark speech quality balance in cellular systems.

Abstract: An improved system and method for maximum likelihood sequence detection where an incoming stream of symbols subjected to intersymbol interference (ISI) are decoded without knowledge of channel coefficients. Through use of improved metrics, the Fano and stack algorithms may be employed to determine the maximum likelihood sequence detection for a given input data stream during blind equalization, offering improved performance over the Viterbi algorithm which requires foreknowledge of the channel coefficients to operate effectively.

Abstract: A method for verifying coverage area by measuring the signal strength throughout the area, estimating the radius of the area based on the measurements, measuring the signal strength at the estimated radial distance, and determining if there is a sufficient proportion of signals at the estimated radial distance with a strength which exceeds a threshold.