Abstract: An improved interference cancellation technique is disclosed. Digital baseband circuitry (40) includes user and symbol detection circuitry (50) for performing a Gibbs sampler type of interference cancellation, either embodied in custom hardware (44) or in software. Random initial guesses for a signal sample (either a symbol or chip) are made for each user. Interference cancellation is performed on a user-by-user basis, using the then-current data decision values for the other, interfering users. A soft data decision is used to derive a probability distribution function for the actual data decision for the sample for the user. A randomly selected value is applied against the probability distribution function to generate the next data decision value for that user, and the process is repeated until convergence. Following convergence, a statistic is used to select a final data decision value for each user, from the set of intermediate data decision values stored in memory.

Abstract: A diversity receiver with simplified construction, excellent receiving signal quality even with very low fading speeds wherein, on the basis of a signal from a receiving unit capable of detecting the receiving signal intensity, an antenna changeover is effected when the receiving signal intensity falls below a changeover threshold value. When, at the termination of a first lapse time from the first antenna changeover, the receiving signal intensity is below that immediately before the first antenna changeover, an antenna changeover is again effected and any antenna changeover is prevented from being effected for a second lapse time from the second changeover. The second lapse time is set to be longer than the first lapse time.

Abstract: The present invention relates to a method and arrangement for performing a cell update procedure in a cellular communications system. The cellular communication system comprises a plurality of cells, and a first and a second network controllers. A station is initially on a first cell controlled by the first controller and then in a second cell controlled by the second controller. When changing from one cell to another the station sends cell update information and other information to the second controller which then stores the received other information and send to the first controller a message indicating that information has been received at the second controller from the station. A network element for use in the above method is also disclosed.

Abstract: A device and method for combining by a diversity technique signals on a common channel in a CDMA communication system. A first base station assigns a dedicated common channel to a mobile station within its coverage area. The first base station provides information about the assigned dedicated common channel to a base station controller to which the first base station is coupled. The base station controller provides the information to at least one second base station which is connected to the base station controller and adjacent to the first base station.

Abstract: A direct conversion receiver is disclosed, in which a DC offset is estimated in two stages. A coarse DC estimation is performed, and the estimate is removed from the received sequence. Then, a coarse synchronization is performed in order to estimate the synchronization position within the burst. Subsequently, a coarse channel estimation and a finer DC estimation are performed simultaneously, and the refined DC estimate is removed. Finally, a refined synchronization and channel estimation are performed, and the refined estimate of the channel is fed to an equaliser, which acts on the received signal, after removal of the refined estimate of the DC component.

Abstract: A method of obtaining data messages at a radio communication network from a mobile station operating therein during downlink transfer, the method comprising the network providing a header portion of the downlink transfer with one or more unique polling codes for requesting the mobile station to transmit one or more respective data messages indicative of one or more corresponding conditions at the mobile station.

Abstract: A process to control a subscriber identity module (SIM) in mobile phone systems. The process consists of the mobile phone network sending one or more specific control values to the subscriber identity module that initiate specific actions or procedures within the subscriber identity module. Certain random values sent by the mobile phone network to the subscriber identity module for regular authentication purposes are used as control values (Control RANDs).

Abstract: An antenna for a mobile telephone, in which a radiation source of the antenna is separated from the user's head while the mobile telephone is in use, to prevent an influence of the radiation waves on the user's head and prevent the non-directional property of the radiation pattern from being degraded. The mobile telephone comprises an antenna body for transmitting and receiving radio waves; a terminal for performing communication based on the radio waves transmitted and received by the antenna body; and a support for maintaining (or supporting) the antenna body to be higher by a predetermined height than the terminal, when the mobile telephone is in use.

Abstract: A method and an arrangement for setting data transfer parameters in a data transfer system is disclosed for use preferably in a digital cellular system. A data transfer connection may be established by setting first the parameters related to speech connection and then, during the speech connection, the data transfer parameters can be changed, when necessary to be suitable for data transfer. Then, at call setup, no data is needed on whether the data transfer connection is possibly to be used for data transfer.

Abstract: In a transmission/reception system, adaptive arrays separate signals from users by multiplying radio wave signals received through array antennas by reception signal weight vectors. A reception signal coefficient vector calculator preliminary calculates a reception signal vector of a U wave and produces a table in a memory. If a cross correlation value of the reception signal vector of the U wave and the reception signal vector of a user newly requesting connection is smaller than a prescribed value, a channel can be allocated to the newly requesting user even if the U wave level per se is high.

Abstract: A method of and system for provisioning analog voice channels and digital voice channels in a in dual-technology wireless system that includes both singlemode and dualmode mobile wireless units determines the number of analog voice channels necessary to produce a desired singlemode grade of service, taking into account overflow of dualmode calls to analog channels, the number of digital voice channels necessary to produce a desired dualmode grade of service, taking into account the overflow of the dualmode calls to the analog channels. The method may be used to provision channels or to form provisioning tables to enable the determination the number of analog voice channels and digital voice channels necessary to produce said desired singlemode and dualmode grades of service for various levels of singlemode and dualmode traffic demand.

Abstract: A civil aviation communication system has a satellite subsystem including a constellation of satellites. A ground subsystem communicates with the satellite subsystem. The ground subsystem includes a number of networked ground stations at selected locations. An airborne communication subsystem is included in the aircraft. The airborne subsystem transmits to the satellite subsystem in a first frequency band. The airborne subsystem receives transmissions from the satellite subsystem in a second frequency band. The airborne subsystem communicates with a ground based system in a third frequency band. The third frequency band is between the first frequency band and the second frequency band.

Abstract: The apparatus and method of the present invention provides a system for spanning operation of a mobile station (110) between a public cellular system (100) for packet data service and a private autonomous cellular system (102) for circuit services when both services are available. In the disclosed system, the mobile station (110) remains on the public system (100) until a circuit call needs to be set up. If the mobile station (110) receives a call on the autonomous system (102), it is notified by the public system (100) via a tunneling message. If the mobile station (110) wishes to originate a call, it switches to the control channels of the autonomous system (102). If the signal strength of the autonomous system (102) falls below a predefined threshold, the mobile station (110) exits the disclosed dual mode, thereby receiving both packet and circuit services from the public system 100.

Abstract: Disclosed is a direct dialing number registering method and apparatus including a parent station (facsimile) connected to a communication line and a plurality of child stations (telephones) capable of two-way communication with the facsimile, wherein due to specific identification numbers pre-set for the individual telephones, transmission/reception between the facsimile and a specific telephone can be performed. A direct dialing number for a telephone is registered into the facsimile, before or after the telephone is caused to indicate to a user that the telephone corresponds to the direct dialing number. In another method, the facsimile is set to a dialing number registering mode by operating the facsimile. Then, a telephone for which a dialing number is to be set is caused to transmit its identification number to the facsimile, by operating the telephone. The dialing number of the telephone corresponding to the identification number received by the facsimile is registered into the facsimile.

Abstract: A wireless communication apparatus (100) and communication method provides an audio-based call connection operation. For example, one method includes receiving an incoming call message (108) and receiving an input audio answer signal (120), such as a user's voice, in response to the incoming call message (108). This method includes detecting an amplitude or characteristic of the input audio answer signal (120) and sending an answer call message (126) based on the detected amplitude level of the input audio answer signal (120). In another embodiment, the process includes storing the input audio answer signal (120) as preconnection audio information (304b) and subsequently sending the preconnection audio information (304b) as a post connection greeting. For example, a user saying the word “hello,” completes the call without any additional greeting required.

Abstract: A method and apparatus for obtaining a channel estimate and a baud frequency offset estimate for a communications channel in a communications system. The communications system has a transmitter for transmitting to a receiver over the communications channel signals representing data appended to a preamble signal.

Abstract: A drum memory controller for controlling random access write and sequential read operations of a drum memory in a communications system. Such drum memory controller (220) may comprise a drum memory (224) having a predetermined number of rows and rings forming a plurality of memory locations arranged in a sequential time order; a random access write address generator (222) which generates write addresses using a respective time tag of incoming data for writing data into memory locations of the drum memory (224) in a random access time order; and a sequential reader (226) which generates read addresses at a constant rate for reading out data stored in the memory locations of the drum memory (224) across each row and then sequencing up in rows in a sequential time order.

Abstract: A method and apparatus for acquiring timing signals for use in a positioning receiver using timing assistance provided by a wireless communications system, such as cellular telephone system. A mobile terminal equipped with a positioning receiver operates in a wireless communications system having control channels and at least one traffic channel unsynchronized to the control channels. The mobile terminal camps on a first control channel in a first cell having a first time base associated therewith. While camped on the control channel, the mobile terminal establishes a local clock reference, internal to the mobile terminal, capable of tracking the first time base. The mobile terminal then operates on a first traffic channel that is unsynchronized to the first control channel and notes the difference in time bases between the control channel and the traffic channel.

Abstract: A device such as a radiotelephone having a housing within which is located a single printed circuit board and a headset socket 30 including a body and spring contacts 38 which are held in operative contact with the circuit board by retaining means comprising co-operating parts 22, 23, 44 of the housing and the body of the socket.

Abstract: A method for allocating a plurality of spreading codes to a plurality of base stations is disclosed. After retrievably storing distances between each of the base stations and other base stations in a memory, the memory is searched for a longest distance of the distances. Based on a necessary spreading code difference and a longest spreading code shift corresponding to the longest distance, a spreading code spacing between spreading codes to be allocated to the base stations is determined. Then, spreading codes with the spreading code spacing are sequentially allocated to the base stations.