Siemens Information & Communication Mobile, LLC

Siemens Aktiengesellschaft

Siemens Communications, Inc.

Siemens Information & Communication Networks, Inc.

Olaf Dicker

Uwe Sydon

Juergen Kockmann

Paulus Sastrodjojo

Sheng Guan

Elie Antoun Jreij

Gerhard Siemens

Holger Steinbach

Rolf Biedermann

Martin Kordsmeyer

James S Umstetter

Jürgen Kockmann

J&uuml;rgen Kockmann

Jim S Umstetter

Juergen Kochmann

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

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 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

A method and an apparatus transmits information in various carrier frequencies with frequency hopping. A tablewith a plurality of n possible carrier frequency values fx in addressesthrough N of the tableis thereby offered. Further, a sequence of random values is generated, for example in a random number generator, on the basis whereof a part M of the N carrier frequency values fx is read from the corresponding addresses of the table, whereby M&#x2266;N applies. Information is subsequently transmitted in the corresponding carrier frequencies. The inventive apparatus or, respectively, the inventive method can be implemented, for example, in a mobile station and/or a base station of a mobile radiotelephone system.

Method and device for transmitting information using varying carrier frequencies by means of a frequency hopping method

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 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

The present invention is directed to a method and to a system for regulating the transmission power of a mobile station ( ) of a mobile radiotelephone system in which information are transmitted in various carrier frequencies with a frequency hopping method. The fixed station ( ) comprises a receiver ( ) for receiving information that are transmitted from a mobile station ( ). The fixed station ( ) also comprises a detector ( ) for detecting the transmission quality of the transmitted information. When the transmission quality is good and the information were transmitted with a high transmission power, a first message for lowering the transmission power is sent to the mobile station and, when the transmission quality is poor and the information were transmitted with a low transmission power, a second message for raising the transmission power is sent to the mobile station. The present invention serves the purpose of lowering the power consumption in a mobile station of a mobile radiotelephone system.

Method and system for regulating the transmission power of a mobile station of a mobile radiotelephone system

A method is provided for wireless communication. The method includes communicating from a first unit to a second unit a plurality of transition signals. Each of the transition signals has a sequential value. The method further includes transitioning the first unit and the second unit from a first state to a second state simultaneously based on the sequential values of the transition signals.

Method and system for changing states in a wireless telecommunication system

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.

Method and system for avoiding bad frequency subsets in a frequency hopping cordless telephone system

A method and system are provided for synchronizing wireless communication devices. The method and system involve providing a first unit and a second unit for communication over a wireless communication link. Further, an identical identifier is assigned to the first and second units. Also, a data message is constructed having control data. The data message includes a plurality of data bytes and a portion of the control data corresponds to the identifier. The data message is split into a plurality of message portions and the message portions are transmitted from the first unit to the second unit. The message portions are received at the second unit. Control data from the message portions is assembled to form a control message at the second unit. The identifier portion of the control message is compared with the identifier assigned to the second unit. When the identifier portion of the control message matches the identifier assigned to the second unit, the second unit enters an in-synchronization state. When the identifier portion of the control message is different from the identifier assigned to the second unit, the second unit enters an out-synchronization state. At least one prior control message is searched for the identifier assigned to the second unit when the second unit is in the out-synchronization state. A matching identifier is synchronized with when the matching identifier is found in the prior control messages. When the prior control messages are free of the identifier, the second unit resynchronizes with the first unit.

Method and system for wireless communication incorporating distinct system identifier bytes to preserve multi-frame synchronizaton for systems with limited control channel bandwidth

In order to be able to control the setting up of telecommunication connections efficiently and reliably in telecommunication subsystems serving as local message transmission loops of telecomunication systems and having network terminations which differ with regard to the transmission channel requirements, a first network termination specifies explicitly, for example in the form of a parameter, the requested transmission channel desired by it in a connection, set-up message of the network termination to the remote station in the telecommunication subsystem.

Procedure for controlling the set-up of calls with transmission channel requirement of different network terminations

A method and system are provided for wireless communication. A base unit and a mobile unit are provided which are operable to communicate over an air interface having a plurality of channels. The method and system further include transmitting from the mobile unit a message on a selected channel for a first predetermined time. The channels are scanned at the base unit. Also, the message is detected at the base unit on the selected channel and the selected channel is used as an initial channel for a wireless communication link between the mobile unit and the base unit.

System and method for synchronization concept for 2.4 GHz direct sequence spread spectrum cordless telephone system

The present invention comprises a system for mobile communications. The system comprises a base station (,) having logic for evaluating parameters relating to the quality of individual communication links (,) between the base station (,) and each of a plurality of mobile units and selecting those parameters that optimize the quality of the communication link (,) for each individual mobile unit. The system also comprises circuitry residing in each mobile unit for establishing an optimized communication link (,) with the base station (,). In accordance with another aspect of the present invention, a method is disclosed for mobile communications comprising three steps. In step one, parameters representative of transmission quality for individual communication links (,) between a base station (,) and each of the plurality of mobile units are monitored. In steps two, the parameters for each of the individual communication links (,) are evaluated to determine the optimum quality for each link. In step three, transmission attributes are selected in response to the evaluated parameters to optimize the transmission quality of each link.

Method and system for mobile communications

A method and system for table implemented frequency selection in a frequency hopping cordless telephone system is provided. A first table comprising an array of sequence numbers is maintained. A second table comprising an array of channel numbers is also maintained. A sequence number is selected from the first table by using a table arrangement number and a subset counter. A channel number is selected from the second table using the sequence number and an index counter. A selected frequency is derived from the channel number and the subset counter.

Method and system for table implemented frequency selection in a frequency hopping cordless telephone system

A method and system are disclosed for shifting frequency subsets to avoid base station interference in a frequency hopping cordless telephone system. A base station communicates with the handsets using frequencies selected from active frequency subsets. Frequency subsets are shifted to avoid interference by selecting frequencies initially from a defined number of active frequency subsets where each of the active frequency subsets is used before repeating an active frequency subset. The number of active frequency subsets is then changed for a defined period of time to change the period with which the active frequency subsets are used. After the defined period of time, the number of active frequency subsets is returned to the defined number of active frequency subsets.

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Austin, TX, United States of America

Olaf Dicker