Showing papers by "John D. Reed published in 1997"

Method and apparatus for location finding in a communication system

Abstract: A method for determining a subscriber unit location in a communication system including the steps of receiving a signal from the subscriber unit (1390) at a first base station, determining a first receive time of the signal based on a sequence of spreading symbols at the first base station, determining a first angle of arrival of the signal at the first base station, and determining the location of the subscriber unit from the first received time, the first angle of arrival, and further predetermined information about the first base station. The signal is formed via modulation by the sequence of spreading symbols.

Method and apparatus for mitigating the effects of interference in a wireless communication system

Abstract: A wireless communication system (200) estimates (303) the location of a mobile station (215) when a degradation in the mobile station's communication occurs due to interference, and stores (305) the location estimate in a database The database is used to determine the potential for the mobile station (215) within the wireless communication system to receive interference based on its estimated location or its proximity to the known interference location When the mobile station (215) is within a predetermined distance of the known interference location, the likelihood for the mobile station (215) to experience a degradation in call quality, duration, etc increases To migitate the degradation due to interference, an alternate carrier (104) is found and if available, the mobile station's communication is handed off to the alternate carrier (104) Attenuation can also be added in the front-end of the mobile station (215) to mitigate the degradation due to interference

Method and apparatus for location finding in a wireless communication system

Abstract: A method and apparatus for determining the location of a communication unit in a CDMA system includes in a first embodiment, sending a location request via a spread spectrum signal to the subscriber (140), and receiving in return a subscriber signal including a response message showing a receive time of a particular symbol of the base's spreading sequence and a transmit time of a particular symbol of the subscriber's spreading sequence. The base (130), along with other receiving base(s) (140), also receives a predetermined symbol of the subscriber spreading sequence, and each determines a respective receive time of the predetermined symbol. The received information is then processed, along with known base location and delay information, to determine the subscriber location. If insufficient number of bases are capable of communicating with the subscriber, for example due to high loading/interference, auxiliary bases (121) are also provided for receiving from or transmitting to the subscriber.

Method and apparatus for distributing offered load in a wireless communications system

Abstract: For a wireless communications system service area (20), a population database (24) is selected that describes a population in database regions (22) within the wireless communication service area (20). A transportation database (46) that describes transportation arteries in the wireless communications system service area (20) is also selected. The process then calculates an initial offered load (70) for each database region (210), wherein the initial offered load is based upon market factors. Thereafter, a portion of each initial offered load (70) is allocated (212) to a transportation distribution pool (76). Other portions of each initial offered load (70) may be allocated (212) to regional distribution pools (74). The offered load in the transportation distribution pool (76) is then distributed (220) over the transportation arteries (36, 38, 40). Finally, a database region offered load is calculated (226) for each database region (22) by accounting for allocation of offered loads to the transportation distribution pool (76) and distribution of offered load in the transportation distribution pool (76) over the transportation arteries (36, 38, 40) in each database region (22).