Patent
Random access in mobile radio telephone systems
TLDR
In this article, a system and method for minimizing interference between two radio stations, e.g., a mobile radio telephone and a fixed base station, at the initiation of a radio communication is presented.Abstract:
The present invention includes a system and method for minimizing interference between two radio stations, e.g., a mobile radio telephone and a fixed base station, at the initiation of a radio communication. A mobile station initiates a random access at the lowest power level and increases the transmission power level until the base station detects the access signal. Once detected, the power level of the message is maintained at the detected level so that the signal interference is avoided. The present invention also provides a mechanism for synchronizing random access communications between mobile stations and the base station despite variation in distances between the mobile and base stations.read more
Citations
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Patent
Random access in a mobile telecommunications system
TL;DR: In this article, the uplink common physical channel (random access channel) frame structure is disclosed with a separate preamble and data portion, which is used by a base station to detect that a mobile station is attempting a random access request.
Patent
Code division multiple access (CDMA) communication system
TL;DR: In this article, a closed loop power control system for maintaining a minimum system transmit power level for a radio carrier station and the subscriber units, and system capacity management for maintaining the maximum number of active subscriber units for improved system performance.
Patent
Power control with signal quality estimation for smart antenna communication systems
TL;DR: In this article, the authors proposed a method for ongoing power control for a communication station with a multiple antenna array, the power control using signal quality estimation applicable for angle modulated signals.
Patent
Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system
TL;DR: In this article, the authors proposed a protocol to reduce collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters by distributing the transmissions over the available resources of the receiver.
Patent
Adaptive power control in a mobile radio communications system
TL;DR: In this paper, a power control indicator indicating whether a first or a second type of power control adjustment should be used by the radio transceiver depending upon the determined difference is sent.
References
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Patent
Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system
TL;DR: A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell-site using code division multiple access spread spectrum communication signals is described in this paper.
Patent
CDMA subtractive demodulation
TL;DR: Subtractive CDMA demodulation optimally decodes a coded information signal embedded in many other overlapping signals making up a received, composite signal as mentioned in this paper, and after each information signal is successfully decoded, it is recoded and removed from the composite signal.
Patent
Radiotelephone transmission power control.
TL;DR: In this paper, the power levels of first and second stations in a cellular radiotelephone system are dynamically adjusted from only one (10) of them, where the second station receives signals from the first and, on the basis of the level of those signals, first adjusts its own transmitter power level to be within a predetermined range.
Patent
Spread spectrum apparatus for cellular mobile communication systems
TL;DR: In this paper, the available frequency spectrum is divided such that one-half is used for mobile-to-base station transmission and the other one half for base station-tomobile unit transmission.
Patent
Digital radio transmission system for a cellular network using the spread spectrum technique
TL;DR: In this article, the authors considered the problem of multichannel digital data transmission in buildings and local areas for the configuration of a so-called cordless LAN, where a base station (BS) and mobile user stations (MS) each with a transmitter (S), a receiver (E) for multipath reception and a control unit (ST) are provided in each cell.