Siemens Aktiengesellschaft

Michael Benz

Anja Klein

Thomas Ulrich

Armin Sitte

Meik Kottkamp

Volker Sommer

Michael Faerber

Erich Kamperschroer

Edgar Bolinth

Jean-Michel Traynard

Reinhard Koehn

Uwe Schwark

Bernhard Raaf

Juergen Michel

Christian Menzel

Stefan Oestreich

Michael Färber

Michael F&auml;rber

Jörn Krause

Holger Landenberger

Franz Goldhofer

Joern Krause

Sebastian Obermanns

Enric Mitjana

Martin Öttl

Hartmut Wilhelm

Christoph Mecklenbräuker

Reinhard Köhn

Erik Newton

Dave Randall

Wanlin Li

The invention relates to a method for power reduction and to a communications system, in particular a radio communications system, which allows such a method. The method for data transmission in a radio communications system having a radio interface between at least one, and in particular a large number of, base stations and at least one, and in particular a large number of, subscriber stations, in which one base station can in each case be connected via a radio interface to a number of subscriber stations provides redundantly coded data which, for the connection with at least one first transmission power level, is transmitted such that data loss is accepted. A chosen portion of the coded data is omitted during the transmission, and the transmission power level is, in contrast, chosen to be higher than the first transmission power level, such that the bit error probability is sufficiently low to allow the data to be reconstructed at the receiving station.

Pulsing the transmit mode for reducing the power when redundancy is involved in transmission

For a communication system (e.g. UMTS with CDMA radio interface), the invention draws a distinction between services with high and low data rate dynamics and uses a matched type of signaling for the transport formats currently being used. The data rate of the data for a service can fluctuate greatly and/or rapidly over time (high dynamics), or may fluctuate only a little and/or slowly (low dynamics). The data for the services are transmitted via a common physical channel, with in-band signaling being used for signaling the transport format for the services with high data rate dynamics, and with signaling in a separate channel being used for the services with low data rate dynamics.

Method and communications systems for transmitting data for a combination of several services via jointly used physical channels

According to the invention, signalling of the used common channels is carried out implicitly via the data rate. Several combinations of channels (spread codes) are only permitted as an alternative for particular data rates of the individual services. Transmission capacity is saved since it is not necessary to reserve individual bits inside the TFCI parameter uniquely for the allocation of said common channels to different connections. The invention is especially useful in the downlink of the FDD modus of UMTS mobile radio systems.

Methods and apparatus for transmitting data in a radio communication system including signaling allocation of a common channel

A method and radio communication system for synchronizing subscriber stations, wherein a time slot is assigned to a number of base stations for transmitting at least one synchronization sequence and adjacent base stations use a different time offset with respect to the beginning of the time slot for transmitting the synchronization sequence. Thus, superposition can be precluded even in the case of a synchronized operation of the base stations. So that the subscriber station can still determine the beginning of the time slot, the time offset is transmitted. The time offset corresponds to the choice of one or more synchronization sequences and/or the sequence of a number of synchronization sequences. The information relating to the time offset is transmitted coded in this manner. A subscriber station receives the synchronization sequence and performs a time synchronization via the time of reception of the synchronization sequence and the detected synchronization sequence designating the time offset and/or the detected sequence of a number of synchronization sequences.

Method and radio communication system for synchronizing subscriber stations

In a cellular telecommunications system using wireless telecommunication between mobile parts and base stations, a method of handing off telecommunications connections from uncoordinated, unlicensed operation of the system to coordinated, licensed operation and vice versa. The method requires only simple circuitry and little energy consumption in the mobile parts. Initial monitoring is carried out in the base station, which supports uncoordinated, unlicensed system operation.

Method for controlling the handover of telecommunication connections between mobile parts and base stations in cellular telecommunications systems having wireless telecommunication

According to the invention, transmissions of the second radio station are received in the first radio station in which the operating instruction for transmission power of the second radio station is determined. The operating instruction is transmitted during a following transmission of the first radio station to the second radio station, whereupon the latter takes into account the operating instruction for power regulation during one of its following transmissions. Contrary to prior art, no time invariable or fixed step size is used. An operating instruction is used instead which is related to a variable step size in transmission power regulation. The variable step size is subscriber-dependent and time-dependent regulated by the radio stations.

Method and radio communication system for regulating power between a base station and a subscriber station

In order to control the transmitting power provided for point-to-multipoint telecommunications links in a telecommunications system with wireless telecommunication and uncoordinated unlicensed system operation, without significant restriction of the transmitting range, use is made of the fact that the maximum number of mobile stations (MS1 . . . MSn) registered in a base station (BS1) is known. Thus, the base station knows at any time how many and which mobile stations are registered. If all mobile stations are registered (N &equals;N ), the base station can match the transmitting power to the mobile station received as the &ldquo;weakest one&rdquo;. In other cases, if not all mobile stations are registered (N &ne;N ), the base station will alternately transmit with the maximum transmitting. power for a predetermined first period of time and then with the reduced transmitting power, which matches the mobile station received as the &ldquo;weakest one&rdquo;, for a predetermined second period of time.

Method for producing a semiconductor storage device

An individual parameter with respect to a required receptivity is determined for at least one service, and is sent by a base station, in a radio communications system which offers a number of services for mobile stations via a radio interface in a radio cell. A mobile station receives and evaluates the parameter, then compares the current receptivity of emissions of the base station with the parameter. The service is requested by the mobile station in dependence on the result of the comparison. The invention is suitable for use in TDMA and CDMA transmission systems.

Method and radio communication system for data transmission

In a method for channel assignment according to the invention, a TDD transmission method with timeslots as channels is used for radio transmission between a base station and mobile stations, with a switching point separating timeslots for a up link direction and timeslots for a down link direction. A transmission parameter relating to a transmission quality is in each case defined for the radio transmission between the base station and a plurality of mobile stations. The mobile stations with the qualitatively better transmission parameter are preferably assigned timeslots close to the switching point.

Method for channel assignment and a radio communications system

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Berlin, Germany

Michael Benz