Siemens Information & Communication Mobile, LLC

Siemens Information & Communication Networks, Inc.

Siemens Communications, Inc.

Paulus Sastrodjojo

Uwe Sydon

Juergen Kockmann

Olaf Dicker

Sheng Guan

Elie Antoun Jreij

H Stephen Berger

James S Umstetter

Ivan G Stepanov

Juergen Kochmann

Donna Lakomski

Juergen Kockman

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

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.

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

A method and system are provided for selecting a communication channel in a wireless communication system. The method and system include defining a plurality of channel groups. Each channel group corresponds to a plurality of communication channels. The method and system also includes setting a set counter to the channel group having the current communication channel. Further, the set counter is incremented after each channel hop and an index counter is incremented when the set counter resets. Next, a sequence number is determined as a function of the set counter and an identifier is associated with the wireless communication device. The method and system continues with determining an offset as a function of the sequence number and the index counter and determining a next communication channel as a function of the set counter and the offset.

Method and system for a wireless communication system incorporating channel selection algorithm for 2.4 GHz direct sequence spread spectrum 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

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

An antenna system for a wireless communication system. The system includes an antenna configured to receive and transmit circular polarized transmissions and a drive system. The drive system is operable to produce at least two outputs having generally the same amplitude and an appropriate relative phase difference so as to create a circular polarization transmission from the antenna.

Circular polarization antenna for wireless communication system

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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Round Rock, TX, United States of America

Paulus Sastrodjojo