Siemens Information & Communication Mobile, LLC

Siemens Aktiengesellschaft

Siemens Communications, Inc.

Siemens Information & Communication Networks, Inc.

Uwe Sydon

Juergen Kockmann

Olaf Dicker

Paulus Sastrodjojo

Hermann-Josef Terglane

Sheng Guan

Holger Steinbach

Gerhard Siemens

Peter Schliwa

Jürgen Kockmann

Anton Kruk

J&uuml;rgen Kockmann

Henrik Wagener

Juergen Kockman

Andreas Mueller

Juergen Kochmann

A TDMA transceiver includes a baseband unit and a HF radio component part, connected by an interface. The baseband unit is independent of norms. The HF radio component part has a sequence control system which can be configured with reference to the TDMA parameters.

TDMA transceiver implementing at least two independent radio standards

A frequency hopping spread spectrum telecommunication system is provided, which selects carrier frequencies based on the number of active slots. The duration that carriers have been employed is then based on the number of active slots (), rather than the number of frames (). Thus, non-interfered with carriers can be used more often than interfered with carriers, thereby improving voice quality.

System and method for adaptive carrier occupancy in a frequency hopping spread spectrum system

A method for avoiding interference in a wireless telecommunication system is provided. The method includes providing communication between a first and second component at an initial frequency. A plurality of successive line quality indicators is determined at a line quality monitor of the first component. Consecutive line quality indicators are summed over a predetermined time to determine a slow hop count. A determination is made as to whether the slow hop count is greater than a slow hop threshold. A determination is made as to whether to provide communication with the first component at a second frequency when the slow hop count is greater than the slow hop threshold. This determination is based on a power level of the second component and a communication strength received from the second component at the first component. A signal is communicated from the first component to the second component requesting the second component to provide communication at the second frequency.

Method and system for power-conserving interference avoidance in communication between a mobile unit and a base unit in a wireless telecommunication system

A method and system for the wire-free transmission of data between a mobile unit and a fixed station in time slots on one of a number of carrier frequencies with fixed station and the mobile unit each respectively include both a device for outputting a predetermined sequence which prescribes the carrier frequencies of the time slots, the carrier frequencies of two successive time slots being different, and an RF module for transmitting the data in time slots, the carrier frequencies of the time slots each being prescribed by the predetermined frequency of the output device.

Method and system for logging on a mobile unit at a fixed station

Providing an audio broadcast for a TDMA system. During a single time slot, an audio message is broadcast from a base art and received at a number of portable arts. An audio broadcast command is generated by designating the single time slot and then transmitted to the plurality of portable parts. An additional portable part transmits a broadcast origination signal and the audio message to the base part which transmits the audio broadcast command to the portable parts. by assigning a time slot other than the designated time slot to a portable part, the portable part does not broadcast audio messages during the designated time slot. More than three receiving time slots and more than three sending time slots are divided out for the base art that includes the designated time slot. The audio broadcast command is transmitted during at least two of the more than three sending time slots.

Audio broadcast in cordless digital system

The invention relates to a method and a device for digital data radiotransmission between a fixed station () and at least one mobile station () at one or several carrier frequencies (F, F. . . ), wherein the data is transmitted in several time slots (Z, Z. . . ) according to the time-multiplex technique. A specific amount of time is required to change from one carrier frequency to another carrier frequency using a slow-hopping HF module. The data is transmitted in an active followed by an inactive time slot during which no data is transmitted and which is sufficient for the HF module to program the frequency for the following active time slot. According to the invention, an inactive time slot is shorter than an active time slot.

Method and device for effective data radio transmission

The present invention comprises a system and method for minimizing the loss of information in cordless communications. The system comprises a first data station () having control logic () operable to establish a plurality of individual communication channels () between the base station () and second data station (). Each of the channels is associated with a unique channel frequency. The control logic () is also operable to select a first unique channel frequency to be used for the first channel () between the two data stations (), determine parameters relating to a spectral separation between each of the channels (), and select unique channel frequencies for the remainder of the plurality of channels () in response to the determined parameters. The system also comprises response logic () residing in the second data station () that is operable to receive the information from the first data station () on the plurality of communication channels ().

System and method for minimizing the loss of information in cordless communications

The present invention relates to a radio inter-face for a cordless small system using the 2.4 GHz ISM band. According to the present invention, a transmission system having a fixed station () and at least one mobile station () is provided for this purpose, the fixed station () and the mobile station () each having devices (RF modules) in order to transmit the data in time slots using a frequency-division multiplex method (FDMA) and a time-division multiplex method (TDMA), and with time division duplexing (TDD). As is known from DECT Standard, the data are modulated onto a carrier frequency (f) using a GMSK modulation method. The RF modules () in the fixed station () and, respectively, the mobile station () are in this case designed such that the carrier frequency (f) is changed after a predetermined time period, which may correspond, for example, to the time duration of a time slot or of a transmission frame. A transmission frame in this case contains 16 time slots.

Radio interface for a small wireless installation in the 2.4 GHZ ISM band

Methods and apparatus for combined wireless telephony and data communication of the present invention include providing a Home RF transceiver and a WDCT transceiver in a common enclosure and synchronizing the operation of the Home RF transceiver to specific time slots in the WDCT TDM frame. More particularly, the Home RF transceiver is prevented from transmitting whenever the WDCT transceiver is receiving and is prevented from receiving whenever the WDCT transceiver is transmitting. This effectively prevents the Home RF transceiver from interfering with the WDCT transceiver and vice versa. According to a presently preferred embodiment, synchronization is keyed to the repeating WDCT TDM frame but is dynamically adjustable based on the actual use of bandwidth by the WDCT devices. Thus, when there is no telephony traffic, the Home RF transceiver has full bandwidth. For each WDCT telephone call in progress, no more than 1/12 of the Home RF transceiver bandwidth is sacrificed. The methods and apparatus of the invention allow the reuse of key components from existing standards to provide a combined voice and data base station. The invention also takes advantage of two proven technologies to achieve its goals.

Methods and apparatus for combined wireless data and voice communications

According to the invention, a mobile radio is provided for radio transmission in time-division multiplex frames, where these frames each alternatively have active time slots (Z ) in which data are transmitted, and inactive time slots (Z ) in which no data are transmitted. The time duration of the active time slots is, in this case, twice the duration of the inactive time slots. The mobile radio ( ) has a burst mode controller ( ) which provides the time-division multiplex frame structure for transmission, and a clock preset device ( ), which presets the clock rate for the burst mode controller ( ). The clock rate which the clock device ( ) presets for the burst mode controller ( ) is twice as high during the inactive time slots (Z ) as during the active time slots (Z ).

Method, mobile station and base station for transmitting signals

A system and method for call screening in a wireless telephone system. When a call is received on an answering machine ( ) associated with a base part ( ), the user at a portable part ( ) may select a call screen button ( ). The resulting signal is received at the base part ( ), which then enters a broadcast mode. The incoming answering machine message is broadcast to all handsets ( ). In a TDMA system, an audio message is broadcast from a base part ( ) during a single time slot of a time division. The user at a particular portable part may then select a pick up button to pick up the call.

System and method for answering machine call screening in a cordless digital system

The invention proposes a method and an apparatus for the radio transmission of user data, arranged in data words of a defined length, in time-division multiplex frames having active time slots in which data are transmitted and inactive time slots in which no data are transmitted. The user data are stored temporarily in a memory at a first data rate, and are read out from the memory and converted into the time-division multiplex frames at a second, greater data rate. During the time period from the beginning of an active time slot to the beginning of the subsequent active time slot, n (n&equals;a whole number &gE;1) data words of the user data are thereby respectively stored. By synchronizing the storing and the reading out of the user data, these data can be transmitted with the smallest possible delay in an arbitrarily selected time slot of the time-division multiplex frame.

Method and device for radio transmission

The present invention comprises a system and method for improving voice quality of cordless communications. The system comprises at least one mobile unit having circuitry for maintaining an individual communication link with a base station. The system also has logic residing in the base station for selecting a frequency to maintain the communication link, monitoring parameters relating to the quality of the frequency, and performing data correction on the frequency in response to the monitored quality of the frequency.

Method and system for improving voice quality in cordless communications

A method is provided for interfacing telecommunication devices. A base unit is connected to a landline for wireless communication. The base unit has a power supply operating at a power supply frequency. A mobile unit is provided for wireless communication with the base unit. The base unit is interfaced to the mobile unit using an interface protocol that has a plurality of frames. Each frame is for transmitting signals from the mobile unit to the base unit and from the base unit to the mobile unit. The frames have a specified frame length. An interference frequency is detected at either the base unit or the mobile unit. The interference frequency is compared with the power supply frequency. The frames are synchronized with the power supply and the specified frame length is adjusted based on the power supply frequency when the interference frequency and the power supply frequency are substantially the same.

Method and system for avoiding periodic bursts of interference in wireless communication between a mobile unit and a base unit

A method and system are disclosed for avoiding bad frequency subsets in a frequency hopping cordless telephone system. A base station communicates with the handsets using frequencies selected from active frequency subsets. Bad frequency subsets are avoided by monitoring the air interface between the base station and handsets for errors in active frequency subsets. Errors in each active frequency subset are counted during a short-term interval using an associated short-term error counter and during a long-term interval using an associated long-term error counter. After each short-term interval, it is evaluated whether any of the short-term error counters has a value that is greater than a defined threshold. After each long-term interval, it is evaluated whether any of the long-term error counters has a value greater than an error count for a blocked frequency subset. A blocked frequency subset is then substituted for an active frequency subset if an associated short-term error counter is greater than the defined threshold or if a long-term error counter is greater than the error count for a blocked frequency subset.

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Round Rock, TX, United States of America

Uwe Sydon