Abstract: A received signal of a control channel of each cell is despread by each spreading code in a correlation detector. The received level of the despread output in a window, including its peak, is measured in a level measuring part and an interference signal level outside the window is also measured. In a control part the difference or ratio between the measured received level and the interference signal level is obtained as a comparison signal for each spreading code, and the comparison signal is compared in terms of magnitude to thereby determine the visited cell of a mobile station.

Abstract: In a mobile communication system in which the service area is covered with a plurality of location registration areas each having a plurality of cells each relating to a specific base station, each location registration area has a plurality of groups so that the cells belonging to any group overlaps partly with the cells of other groups, but do not completely coincide with cells of other groups, and each mobile station belongs to one of said groups. When a mobile station moves beyond the border of location registration areas, the location updating for the mobile station is carried out at the cell in which the mobile station stays. In that case, as the mobile stations are classified into a plurality of groups, the traffic in each cell for location updating is dispersed to many cells, and the maximum traffic density for location updating per cell is reduced. So, the number of control channels in the system for location updating may be reduced.

Abstract: A location method and system for a mobile communication system having a plurality of zones and a plurality of sectors in each zone. The location method and system locate a zone and sector in a zone where a mobile station is located. In the location system a base station associated with each zone transmits a control channel signal and transmits a sector signal for each sector in the zone. Each control signal of a zone differs from control channel signals of other zones. Each sector signal differs from other sector signal and control channel signals. A mobile station controller associated with each mobile station receives the control channel signals, determines which zone the mobile station is in as a location zone based on the received control channel signals, receives sector signals for sectors within the location zone, and determines which sector of the location zone the mobile station is in as a location sector based on the received sector signals.

Abstract: Respective location registration areas (A, B, C,) in a mobile communication network include a plurality of base station service areas (a.sub.1 -a.sub.n, b.sub.1 -b.sub.n, c.sub.1 -c.sub.n). By partially overlapping the respective location registration areas, each of the respective base station service areas, for instance, (b.sub.23, c.sub.23) belong to a plurality of location registration areas (B, C). The respective base station (b.sub.23, c.sub.23) transmits all the location registration codes (B, C) together with one designated primary location registration area code (B) to be selected by a mobile station. The mobile station begins communication after registering the designated area code. When, during communication, the mobile station moves beyond the location registration area boundary, no registration is updated so long as the mobile station stays within communication with a base station transmitting the designated registered area code.

Abstract: In a message-transmitting station, a signal to be transferred is divided into a plurality of time slots, an error correcting/detecting code is added to each time slot, and a re-transmission sequence order number in unit of messages, a re-transmission number and an address designating ID of a terminal device are added to a specified time slot. Then, data of the time slots are transmitted from the message-transmitting station to a message-receiving station. In the message-receiving station, it is determined whether or not any order number is missing, by demodulating and decoding the data unit containing the re-transmission sequence order number and the address, and a re-transmission request signal is transferred in accordance with the result of the comparison between the sequence number included in the demodulated, decoded data unit and the sequence number received last as an indication of the condition in which the data in each data unit has reached the message-receiving station.

Abstract: A central station generates and transmitted data of a transmission format. The transmission format includes an I/B bit indicating permission or inhibition of a new transmission of a next transmission timing of terminal stations, an R/N bit indicating reception or non-reception of a signal at the central station, and partial data produced from data received at the central station in accordance with a predetermined rule. One or plural of the terminal stations transmit the signal containing signal-length data W to the central station. The terminal station starts new transmission when the I/B bit indicates the permission of transmission. The central station determines and transmits the I/B bit, the R/N bit, and the partial data in accordance with the reception of the signal-length data W and the data transmitted from the terminal station. The terminal station determines whether or not a signal has been correctly received at the central station, in accordance with the R/N bit and the partial data.

Abstract: According to a method of arranging radio control channels in mobile communications, for covering a service area with a plurality of radio zones and causing base and mobile stations to exchange signals through the control channels, a broadcasting information transmission portion is assigned to the control channels. This broadcasting information is to be transmitted from the base station to each mobile station to broadcast information associated with radio zones. Information associated with control channel structure in units of base stations is broadcast to the broadcasting information transmission portion. A frequency and a time slot capable of causing the base station and the each mobile station to exchange the signals are determined on the basis of the pieces of broadcasting information and an identical number commonly recognized by the base and mobile stations.