Siemens Aktiengesellschaft

Karl Kammerlander

Peter Jung

Egon Schulz

Friedbert Berens

Erich Kamperschroer

Edgar Bolinth

J&ouml;rg Plechinger

Uwe Schwark

Paul-Walter Baier

Josef Gammel

Marcus Besson

Anton Haderer

Werner Troks

Hans Von Der Neyen

Hans-Juergen Von Der Neven

Josef Albersmann

Hans-Juergen V Neyen

A method for changing only one radio channel of an existing duplex radio link is wherein the radio channel changed or to be changed is the disturbed radio channel. The new radio channel (D) exhibits, for example in comparison with the disturbed radio channel, only a different timeslot wherein, the radio frequency remains the same.

Method for changing radio channels in a radio communication system

In a GSM mobile radio network having at least one base station controller and a first base station, at least one first frequency channel is made available within a frequency band between the first base station and the mobile stations in order to transmit data and to transmit signaling information. According to the invention, the first base station additionally makes available a second broadband frequency channel with a TD/CDMA transmission method. After a connection has been set up in the first or second frequency channel, a handover of the connection to the respective other frequency channel is carried out by the base station controller without a second base station being selected.

Method and radio communications system for transmitting data in a mobile radio network

The new CDMA (Code Division Multiple Access) system structure which is equivalent to the structure of a CDMA system operating with direct code spread (DS, Direct Sequence) but operates with multicarrier (MC) methods. The multicarrier method is introduced a suitable selection of the spread code, with the result that the production of signals in CDMA systems with DS and with MC is harmonized and JD (Joint Detection) multisubscriber detection methods, which are known per se, with or without diversity reception can be used.

System for radio transmission of digital signals between a plurality of subscriber stations and base station

A mobile radio network comprises a plurality of base stations in a mutual three-dimensional arrangement in the manner of a cellular system. A respective, rigidly prescribed plurality of immediately adjacent, neighboring radio zones forms a radio zone group in which the frequency channels available are repeated. A problem area occurs in the design of radio zones in that the ground-bound radio propagation dependent on terrain and the nature of the built-up area leads to irregular field intensity distributions and radio zone boundaries; however, the radio zones must be designed according to the distributions of the radio traffic density. A solution for the traffic-qualified radio zone boundary is provided which is best suited for the detection of radio zone boundaries. The identificaiton of the radio zone boundary of two mutually-adjacent radio zones as a criterion for the transfer of mobile subscribers into a different radio zone is provided through a relative range measurement as a comparison of the distance of a mobile subscriber from two or more base sections and an evaluation of the phase difference of their signals is carried out. This transit time measurement is executed by way of the organization channels for operationally-ready radio subscriber devices and in the voice channels for radio subscriber devices involved in a call, the latter upon the use of the measurement receiver of the radio base stations.

Mobile radio network

A process for monitoring analog and digital mobile radio connections is disclosed within the framework of a mobile radio network comprising a number of radio base stations in a mutual spatial arrangement in the form of a cellular system having overlapping radio ranges. A predetermined number of radio ranges, directly adjacent to one another, form a group of radio ranges in which the total number of available frequency channels is repeated. A simple functionally-reliable monitoring system provides that the useful signals transmitted in the specific time slots are radio range related information blocks which are time compressed and delayed at the transmitting end. Data block sequences containing monitoring signals are inserted into the time gaps which arise during time compression. At the receiving end, following the gating out of the data block sequences to a signal processing unit, the compressed received useful signal is fed to an expansion device. The time blocks are thus brought to precisely the same length as the original useful signal.

Process for monitoring analog and digital mobile radio connections

A circuit for the asynchronous measurement of the phase jitter of an incoming signal, at least a part of which is digital, includes a differentiator for sensing pulse transitions of the incoming signal and a periodic function generator resetable by the differentiated pulses. Function valves generated by the function generator coincident with the differentiated pulses are added together and averaged to form an average value of phase jitter based on the number of incoming signal transitions that are sensed.

Circuit for ascertaining of the phase jitter of digital signals

A system for the reception of digital communication signals which are impressed in the form of a frequency modulation upon a carrier such that they are reflection free and can be used particularly for mobile stations, long distance traffic and scatter beam connections.

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Wolfratshausen, Germany

Karl Kammerlander