Abstract: In CDMA mobile communication of the packet switching mode which is one-way, the packet is transmitted to divide to a frame unit. In this time, the first, the second and the third transmission timing which are obtained to divide to three pieces the predetermined frame are set up for increasing the transmission efficiency by realizing the retransmission of the frame unit, as the transmission timing of a backward control signal in a backward channel,. Base station 100 transmits a forward signal (a forward control signal and an user data signal) by using code A (a forward channel) at any frame. When the forward signal is received at this frame by mobile station 70, mobile station 70 transmits a receiving acknowledgment signal (a backward control signal) of the forward signal by using code A' at the first transmission timing of the next frame.

Abstract: A cell selection scheme for a CDMA mobile communication system which is capable of reducing an amount of interference power and thereby preventing the degradation of the system capacity. In this scheme, each base station transmits a perch channel which is spread by using a spread code assigned to each base station. Then, a mobile station receives more than one perch channels transmitted from more than one base stations, calculates a transmission attenuation value of each received perch channel, and judges a located cell according to calculated transmission attenuation values of these more than one perch channels.

Abstract: An object of the present invention is to reduce the control time required when a channel handover is performed in a mobile communication system. The conventional system has such shortcomings that a long time is required for re-designating a channel when a channel handover procedure results in failure. Particularly, in the common access type system, there is such a problem that since a channel handover is required to be performed several times during a channel handover procedure, an extra time is required for performing the handover procedure. The present invention has a plurality of base stations for covering the service area, and a mobile station for performing a communication with the base stations through radio channels.

Abstract: A computer system 200 having a hierarchical file directory system in which a user's patterns of use are analyzed when the user calls a file access routine such that the system tracks 904 which directories and files are accessed most frequently by the user when in a particular application 906. Upon the user accessing a particular application, the system then presents the user with a list of files or directories 908, 910 in order of most likely use from the particular application.

Abstract: A transmission system includes a transmission path from a transmitting station to a receiving station for both voice telephone service occupying the frequency spectrum below a predetermined frequency f.sub.1 and for data service occupying the frequency spectrum above another predetermined frequency f.sub.3, where f.sub.3 is substantially higher than f.sub.1, a plurality of telephone sets at said receiving station connected in parallel with one another to the transmission path, and where each of the telephone sets has an on-hook state which presents a substantially infinite resistance to the transmission path and an off-hook state which presents a predetermined resistance R to the transmission path. A plurality of separate and substantially identical multi-pole low-pass filters are provided for connection between the transmission path and respective ones of the telephone sets, where each of the low-pass filters has a -3 dB frequency f.sub.2 which lies between f.sub.1 and f.sub.

Abstract: A method and system for providing security for a computing device include resolving conflicts between a password-protected screen saver and communication notification capabilities by selectively enabling access to specific communications when the computing device is in a locked mode. The screen saver of the computing device is configured to switch the device from a normal operative mode to a locked mode in response to detection of a preset condition, such as the expiration of an idle-time timer. The computing device then remains in the locked mode until a preset authorization condition is recognized, e.g., entering a password. However, with the computing device in the locked mode, a subset of communication access capabilities is enabled. Specifically, notification of incoming communications is enabled. Preferably, connectivity for select types of outgoing calls is also enabled, e.g., connectivity for emergency calls.

Abstract: A scheme for intermittent reception of paging signals in a mobile communication system, in which each base station repeatedly transmits a frame which contains: at least one regular reception section having a plurality of paging indication regions provided in corresponding to a plurality of groups, in which a paging presence information for indicating a presence of a paging with respect to a mobile station of a group is set in a paging indication region corresponding to that group when a paging with respect to a mobile station of that group occurs; and a mobile station alerting section having a plurality of identification information setting regions provided in correspondence to a plurality of paging indication regions, in which an identification information of a mobile station called by a paging indicated by a paging indication region is set in an identification information setting region corresponding to that paging indication region.

Abstract: A CDMA demodulating apparatus with an improved interference canceling effect when there are a large number of communicators. A reception signal having a frame configuration in which a pilot signal of a known pattern is inserted between information signals is received from a plurality of communicators. Transmission data of each communicator is demodulated, an interference canceler for estimating is provided in a plurality of stages, in each channel of each stage, a variation of transmission path is estimated in each path to achieve data demodulation and estimation of interference replica. The later the stage, the more error of interference signal replica can be reduced, thereby improving the interference canceling effect. An even better effect can be obtained when interference canceling is performed after detecting a reception level of each channel by summation of reception power of each path of each channel, and channel ranking is determined in the order of higher reception level.

Abstract: Methods and apparatus are described for routing transmissions from a plurality of transmission lines to a plurality of devices associated with the transmission lines. An incoming transmission is received via a first transmission line. Source information associated with the incoming transmission is determined and a data type of the incoming call is determined based on the source information. A routing protocol for the incoming transmission is then determined according to the data type and a transmission hierarchy. The incoming transmission is then routed according to the routing protocol.

Abstract: In an error control device, an error correction decoding portion 33 selects a bit position which has low reliability from the received signal by means of a predetermined bit number, generates error patterns by assuming that the errors exist at the bit position, and carries out modified Chase decoding for the received signals on the basis of each error pattern in modified Chase decoding portion 332. Modified Chase decoding portion 332 calculates the reliability of each error pattern by using the reliability of each bit in the received signal.

Abstract: An ATM transmission system which transmits voice data in an asynchronous transfer mode (ATM). It implements compression of a mute section over a channel by detecting the mute section of a call and by physically suppressing its transmission over the channel as an ATM cell. A transmitting side detects the mute section, generates vocal/mute information, and generates a mute start cell and a mute end cell. A receiving side generates a mute section at a fixed interval when receiving the mute start cell, and returns to a normal receiving mode of a speech spurt cell immediately when receiving the mute end cell. The suppression of the mute section makes it possible to reduce the occupied bandwidth, and to increase the channel efficiency.

Abstract: A system for providing automatic call distribution and training is provided. This system includes agents capable of answering incoming telephone calls. In the preferred embodiment, a queue handler processes the incoming telephone calls to an automatic call distribution system. A monitoring means, such as a server, is used to monitor the queue. It can also monitor agent activities. A contacting means, such as a computer, is used for connecting the agents to the incoming calls. The contacting means also provides training to the agent. Thus, the agents are automatically provided with training based on the queue activity.

Abstract: A data compression/expansion method and apparatus are provided. The data compression apparatus (70) includes a repetitive symbol detector (72), a shift register (74), a FIFO (76), a byte counter (78), and a map buffer (80). The symbol detector (72) generates an output signal indicating the presence of repetitive symbols in an input data segment (10). The shift register (74) functions as a map generator, producing a map (16) for locating the repetitive symbols in the input segment (10). The FIFO (76) acts as a gate for removing the repetitive symbols from the input segment to produce a compressed output segment (14). The compressed segment (14) and map (16) can then be transmitted to the expansion apparatus (90). The data expansion apparatus (90) includes a buffer (92), a shift register (94), and a multiplexer (95). The buffer (92) temporarily stores the compressed segment (14).

Abstract: In a system with a spread spectrum transmitter and receiver employing composite spreading codes, the transmitter spreads, in a spreading part, a baseband modulated signal by a short code from a short code generator and a long code from a long code generator with a longer chip period than that of the short code and then transmits the spread baseband modulated signal. The receiver despreads a spread baseband received signal in a receiving part by a pair of short and long codes in one despreading part to obtain a baseband modulated signal of a direct path and despreads the spread baseband received signal by the pair of short and long codes delayed by a multipath delay time difference in the other despreading part to obtain a baseband modulated signal of a delayed path, and the baseband modulated signals thus obtained are diversity-detected to obtain a detected baseband signal.

Abstract: A telephone utilizes a grid of light beams to generate signals that are unique to particular key regions of the telephone in response to interruptions of light beams that intersect at the particular key regions. The key regions of the telephone are arranged in a matrix of rows and columns and the light grid includes horizontally and vertically oriented pairs of light sources and photo detectors that have respective light beam paths passing through rows and columns of key regions. The intersection points of one of the horizontal and vertical light beam paths correspond to particular key regions. In one embodiment, the light sources and photo detectors are raised from a surface of the support structure such that the light beam paths cross the matrix of key regions at the exterior of the support structure.

Abstract: A method and system for client identification include a control unit configured to enable call service features in communication devices supported by the control unit. A first communication device transmits an off-hook message to the call control unit with a first memory-space physical address locally accessed from memory associated with the first communication device. The first physical address represents a location in main memory of call service profile data associated with the first communication device. The control unit responds to the first physical address by accessing a first data set from the main memory. A verification program determines whether the first data set includes the first call service profile. The control unit enables a first set of call services indicated by the first call service profile data for the first communication device if the first call service profile is included in the first data set.

Abstract: Transactions sent from a source node to a destination node interconnected by a distributed network are protected from interception by a third party by passing the transaction data into several packets which are renumbered as a pseudo-random sequence and sent along different routes from the source node to the destination node.

Abstract: A wire line data transmission scheme in a mobile communication system for reducing the wire line transmission const. Radio state qualities of a plurality of radio channels between the plurality of base stations and the mobile station are measured, and a validity and a redundancy in composition of each radio channel is judged according to the corresponding measured radio state quality. Then, a transmission in the wire line transmission paths is controlled by stopping a transmission of transmission signals for those radio channels which are judged as invalid or redundant according to the obtained judgement result. All of measuring, judging, and controlling can be carried out by each base station, or by the mobile station. Also, measuring and judging can be carried out by the mobile station while controlling is carried out by each base station, or measuring can be carried out by the mobile station while judging and controlling can be carried out by each base station.

Abstract: Multiplex transmission apparatus 10 on the transmitting side multiplexes received signals from non-voice signal input output apparatus 14 and voice signal input output apparatus 16, and also transmits the multiplexed signal from communications network 30 by digital portable telephone 12 on the transmitting side. The digital portable telephone transmits a signal per 20 msec, so that multiplex transmission apparatus 10 alternately transmits the voice signal and the non-voice signal at an interval of 20 msec, for example. Multiplex transmission apparatus 20 sorts out the voice signal and the non-voice signal from the supplied signal by checking the error detecting code of the supplied signal. Multiplex transmission apparatus 20 can judge the type of the signal according to the type of the error detecting code, because a different error detecting code is added to each signal.

Abstract: A method and system for distinguishing valid DTMF signals from spurious DTMF noise includes detecting signals having a first signal component indicative of DTMF signals and having a second signal component having frequencies unrelated to DTMF frequencies. The second component is utilized in isolation from the DTMF frequencies of the first signal component. The analysis includes determining a signal level representative of the second signal component. If the signal level exceeds a predetermined threshold level, the first signal component is determined to be spurious noise. On the other hand, if the signal level is below the threshold level, the first signal component is passed to a DTMF-responsive system, such as a voicemail system or a voice response unit. Optionally, the operation includes requesting confirmation of the signal of interest, if the signal level of the second signal component falls within a range which includes the threshold level as its upper limit.