Abstract: A method for allocating emergency speech items in a mobile communication system comprising a network infrastructure (BS), a first subscriber station (MS1) connected to it, and at least one other subscriber station (MS2, MS3), the method comprising maintaining a group call consisting of speech items between the first subscriber station (MS1) and at least one other subscriber station (MS2), transmitting an emergency speech item demand (101) from the first subscriber station (MS1), which is in an emergency, to the network infrastructure (BS), and transmitting an emergency speech item grant message (102) from the network infrastructure to the first subscriber station. The method further comprises transmitting, to the at least one other subscriber station (MS2, MS3), emergency speech item information (103) containing the identifier of the first subscriber station (MS1) and indicating that an emergency speech item has been allocated (102) to the first subscriber station.

Abstract: A method and apparatus for controlling roaming in a multiple service provider environment. When a mobile station determines that it can no longer obtain acceptable service from a primary service provider, the mobile station determines whether it is operating at the periphery of the primary service provider coverage area. If it is, then the mobile station is permitted to obtain service from a secondary service provider (i.e. roam). If it is determined that the mobile station is not operating at the periphery of the primary service provider coverage area, then the mobile station is prevented from roaming for a time period which allows the mobile station to emerge from a presumed coverage hole.

Abstract: During the occurrence of an incoming voice call to a portable telephone handset within an in building telephone system, a method is disclosed for offering the voice call while the called handset is in a data session with an application. In such a case, the data session is interrupted and the handset display and softkey information is saved to memory. The name or number of the calling party is then written to the display of the called handset while the incoming call is offered to the user. A call acceptance signal from the called handset results in the establishing of a voice communication connection between the handset and the calling party. Independent of whether the incoming call is accepted or rejected by the user of the called handset, the saved display and softkey information is restored to the called handset and the data session is resumed between the portable handset and the application once the selection is made.

Abstract: The radio control unit (RDU) which is near to the switching office and which is connected via a transmission link (UT) to radio base stations (RBS) near the subscriber is divided into a plurality of switching office-side interfaces (LEIM) conceived as a downtime unit and subscriber-side interfaces (RBIM) which have multiple access to one another in various ways via a multiple bus system. The subscriber connection data are distributed over the databases of the interfaces (RBIM, LEIM). There is good insensitivity to failures with a low level of expenditure on hardware and development.

Abstract: The housing (12) for a portable device (10) has a cavity (40) which engages a boss (28) on a U-shaped clip (22) to prevent a relative rotation between the housing (12) and the U-shaped clip (22) whenever a force is exerted on the free end of the U-shaped clip (22) when fitted over a belt. The boss (28) is disengaged from the cavity (40) whenever a force is applied which deforms the U-shaped clip (22), thereby allowing the housing (12) to be rotated to view an annunciator presenting a message. The U-shaped clip (22) rotates about a pivot formed by a first boss (26), and second boss (24) having a D-shape, which engage a first bearing (42) and second bearing (44), respectively. The D-shape of the second boss (24) and configuration of the second bearing (44) enable the U-shaped clip (22) to be assembled to/disassembled from the housing (12).

Abstract: A communication restriction command code for a mobile station is added to a base station identification code transmitted from the base station. When the mobile station is positioned within an area desired to suppress electromagnetic wave signals, the base station identification code including the communication restriction command code is received to interrupt transmission or reduce transmission power to be smaller than normal transmission power to perform communication control for restricting transmission of the mobile station.

Abstract: An apparatus for reducing undesirable low-frequency distortion in a direct conversion communication receiver includes a signal generator to produce a first periodic signal and a second periodic signal. A merge circuit combines an input signal and the first periodic signal to produce a modulated signal with a polarity switched component. A frequency translation circuit converts the modulated signal into a baseband signal with a spectrum substantially equal to the modulated signal, but centered around a carrier frequency of approximately zero and including a low-frequency error component. An output modulator circuit combines the baseband signal with the second periodic signal to produce a modified baseband signal wherein the low-frequency error component is shifted to a high frequency spectrum position and the polarity switched component is eliminated.

Abstract: Intelligent allocation of wireless resources can help avoid the problems of dropped calls in a mobile communications network. A service for allocating resources is designed to develop profiles of subscribers' mobility. That is, profiles are developed for routes, traveled by subscribers at certain days and times. For example, some subscribers commute to and from work at relatively fixed times. By compiling this information in the profile and tracking the movement of the subscriber, the mobile network can anticipate the subscriber's movement into a next cell. Thus, wireless resources in the next cell can be reserved prior to the anticipated handover of an ongoing call involving the subscriber. Thus, uninterrupted service can be maintained and dropped calls can be avoided.

Abstract: In a TDMA mobile-to-mobile connection, the end-to-end audio signal quality as well as system performance can be improved by providing digital signal processors the capability to automatically switch configuration such that each digital signal processor in a mobile-to-mobile communication connection can automatically identify a TDMA mobile-to-mobile connection and bypass the speech encoding and decoding processes within the digital signal processors. The two digital signal processors are virtually connected at the channel codecs.

Abstract: An unsynchronized base site (104) transmits a time synchronization request to a communication unit (110). A time synchronization error, or a timing offset, for the unsynchronized base site (104) is then determined and transmitted back to the unsynchronized base site (104) to enable the unsynchronized base site to synchronize itself. The time synchronization error is determined for the unsynchronized base site (104) based on the time difference of arrival of the signals received by the communication unit (110) from the base site (104) and at least one synchronized base site (101), the location of the communication unit (110), the location of the base site (104), and the location of the at least one synchronized base site (101).

Abstract: A communication processor that uses a group of hardware buffer descriptors and a virtual array of buffer descriptors to control the communication ports of the communication processor. The virtual array of buffer descriptors is a data structure stored in a local memory that contains data fields that are similar to the hardware buffer descriptors of the communication processor. The processor swaps data between the hardware buffer descriptors and the virtual array of buffer descriptors to provide “just in time” storage of control and status information used by the communication ports to transmit and receive data.

Abstract: A system and method that makes more efficient utilization of BTS resources when BTSs are employed in time of arrival (TOA) measurements as is common in mobile positioning operations. A maximum signaling delay is assumed for which BTS resource assignment is delayed by a default time span in the event of an impending TOA measurement thereby allowing the BTS availment of the resources which would otherwise be idle yet assigned and therefore unavailable for other BTS functions during the period of signaling delay. The period of resource assignment delay may be increased or decreased, the actual adaption of the delay dependent on the true signaling delay.

Abstract: A method and apparatus for transitioning between control channels in a cellular telecommunications system by using adaptive hysterisis. In an embodiment of the invention, when a mobile station attempts to transition from an analog control channel (ACCH) to a digital control channel (DCCH) and subsequently returns to the ACCH, a threshold level of DCCH received signal strength (rssi) at the mobile station that triggers a transition attempt from an ACCH to a DCCH is incrementally increased. Incrementally increasing the threshold level DCCH rssi prevents unnecessary transitions back and forth between an ACCH and a DCCH when the rssi of the DCCH is close to a minimum level that triggers a camp on the DCCH after a synchronization, or when the mobile station cannot synchronize to or camp on the DCCH successfully.

Abstract: The present invention involves an adaptive digital radio communications architecture which can be reconfigured by reprogramming at least one programmable device, and thus more efficiently use the available bandwidth of a time-varying RF channel and/or to provide a flexible and adaptive digital communications system. In certain embodiments, the programmable device uses a Programmable Logic Device (PLD) to perform the digital communications processing functions of the transmitter or the receiver of a radio communications system. In this context, PLD is a general term representing a family of programmable logic devices; examples of this family are a Programmable Array Logic (PAL), a Complex PLD (CPLD), and a Field Programmable Gate Array (FPGA). The architecture is reconfigurable in the sense that any or all of the digital communications processing algorithms can be modified by reprogramming the PLD.

Abstract: A mobile station for transmitting a mobile radio signal to a base station has a memory device in which a number of available applications are stored which can relate to different “carriers,” i.e., mobile radio network systems or service providers within a single mobile radio network. A selection device of the mobile station calculates expected charges for a desired connection for each of these applications which are being considered for the transmission connection. Based upon the calculations, the most cost-efficient application for the desired transmission is selected. The actual transmission of the communication data for the base station is then carried out on the basis of this application.

Abstract: The invention relates to establishing a connection in a satellite system. The base station continuously transmits information to the satellite for establishing a connection. The first terminal receives the reference and control carrier wave retransmitted by the satellite, whereafter the received information is used for selecting at least one frequency available for communication, and the selected frequency will be used for a desired connection with a particular terminal.

Abstract: A method and apparatus for fraud control using enhanced techniques with the call interdiction feature of a switch. A system in accordance with the principles of the present invention includes a fraud control system that monitors calls, identifies both legitimate and fraudulent cellular phones, discriminates legitimate cellular phones from fraudulent cellular phones, and then transmits an interdiction message to the switch, wherein the interdiction message instructs the switch to terminate calls placed from fraudulent cellular phones, while allowing calls placed by legitimate cellular phones to continue undisturbed.

Abstract: A system and method are disclosed in which a service provider in a first environment of a first plurality of competing, overlapping mobile networks has at least one service node. The service provider offers subscriptions based on SIM modules from at least one of a second plurality of mobile telephone operators in a second environment. The first plurality of operators has agreements for interconnect traffic with the second plurality of operators. Mobile users that are visitors in the first environment can communicate, through any appropriate network selected from the first plurality of mobile networks, which avoids the detouring of incoming calls to the visiting mobile users.

Abstract: An image capture, conversion, compression, storage and transmission system provides a data signal representing the image in a format and protocol capable of being transmitted over any of a plurality of readily available transmission systems and received by readily available, standard equipment receiving stations. The system is adapted to be installed in a standard cellular phone configuration, providing a portable, hand held, wireless transmission system for transmitting video image signals to a remote receiving station.

Abstract: A method for avoiding unnecessary signalling in a cellular system is disclosed whereby a “VMSC data generation” or similar field of information can be utilized in an HLR queue. When the HLR is storing Location Erasure data in the queue, the HLR can also store the most current “VMSC data generation” field together with the Location Erasure data in the queue. Prior to sending a Location Erasure message to a VMSC from the HLR's queue, the HLR determines whether the current “VMSC data generation” field is different than the one stored in the queue. If so, the HLR can discard the Location Erasure data in the queue, and thus defer from sending the Location Erasure message to that VMSC. Alternatively, when the HLR notes a new “VMSC data generation” field, the HLR scans the complete queue and discards all Location Erasure messages associated with an older “VMSC data generation” field than the current one noted by the HLR.