Motorola Corporation

National Semiconductor Corporation

Other

Charles J Malek

David L Weigand

Gerard G Socci

James A McDonald

Dennis M Rose

Angel Fernando Favila

Nicholas M Labun

Robert W Furtaw

Robert D LoGalbo

Thomas A Sexton

Anthony Kobrinetz

James Francis Goedken

William F Pickert

Peisong Huang

S Dilip

Fatih Unal

Greg G Gravunder

Shao Weipan

This invention provides a system and method for splitting control and media content signals of a cellular network connection of a mobile station. A mobile station engages in a WAP browsing session with a cellular network connection over an air interface. As a user moves into coverage area of an access point, another browsing session is established between the mobile station and a non-cellular network connection. More specifically, the user's WAP browsing session with a cellular network connection is upgraded to a Web browsing session with a non-cellular network connection. The present invention permits a user to control a Web browser on a remote device by providing user input to the mobile station. In particular, a media content portion of the cellular network connection is split and rerouted to the remote device, and a control portion of the cellular network connection is split and rerouted either via the non-cellular network connection or via the cellular network connection.

Method and apparatus for splitting control and media content from a cellular network connection

A transceiver device having a forward error correction decoder providing at least one forward error correction metric and a data integrity monitor providing at least one automatic retry query metric to a data processor or CPU. The data processor or CPU is responsive to the forward error correction metric and the automatic retry query metric and has outputs providing a forward error correction value and an automatic retry query value to the forward error correction/data encoder and decoder.

Dynamically changing forward error correction and automatic request for

A multi-tasking, dynamically controlled micro-sequencer for use in a TDMA communication system is described. Rather than the output of the sequencer being solely a linear sequence of instructions in a microcode RAM, the output of the sequencer is augmented by an output of finite state machines (FSMs) providing a sequence of control codes. The FSMs provide control signals for building a slot in accordance with a specific protocol. The sequencer core provides enabling signals to the FSMs to enable the proper FSM depending upon the mode of the transceiver. A conditional logic block is included in the sequencer core which detects special operation codes (opcodes) for each slot to cause the microcode sequence to jump to a certain routine if a condition is met or not met.

Multi-tasking sequencer for a TDMA burst mode controller

A technique is disclosed for allowing a seamless handover between base stations in a TDMA controller as a telephone handset is transported from one base station's area to another. The disclosed circuitry enables the TDMA controller to assess the quality of the handover before switching to the new base station. When it is determined that a handover operation is to commence, transmissions are made in the original slot time and a handover slot time within the same frame. Also during the same frame, data is received at two separate slot times. Only when it is determined that the data received in the handover slot time contains no transmission errors is the handover completed by then only transmitting on the handover slot transmit time and receiving on the handover slot receive time. In the preferred embodiment, it is determined whether the received data contains no transmission errors by detecting the CRC codes, the signal strength, and the existence of any invalid words.

Seamless handover in a cordless TDMA system

An audio error mitigation technique for a TDMA communication system is disclosed. An audio error is assumed if any one of the following criteria is met: a detection of a CRC error in the control data or audio data within a slot; the received signal strength is below a certain threshold; or, the detection of an invalid code word, such as an all zero nibble. If either of the criteria is met, and the slot contains audio data, an error mitigation routine is performed. In one embodiment, the error mitigation routine replaces the faulty burst with the previous non-faulty burst. In another mitigation routine, any dv/dt spikes in the faulty burst are detected and smoothed by averaging nearby samples. In one embodiment, both mitigation routines are selectable in the TDMA system.

Audio error mitigation technique for a TDMA communication system

An apparatus and method provides synchronous communication in a communication environment (102) wherein multiple base stations are adapted to operate on the same frequencies. In particular, the base stations which operate within range of one another must be coordinated to minimize interference with other base stations which may otherwise operate independently. Each base station operating in a system will determine whether another base station operating on the same frequencies is within range (310). One of the base stations will assume a role as a master and the remaining base station will then synchronize to the master base station (312). The preferred methods for synchronizing the base stations includes signaling protocols (702, 902) and collision avoidance techniques for digital multiple access communication systems.

Method and apparatus for providing a synchronous communication

A multi-tasking, dynamically controlled micro-sequencer for use in a TDMA communication system is described. Rather than the output of the sequencer being solely a linear sequence of instructions in a microcode RAM, the output of the sequencer is augmented by the output of finite state machines (FSMs) providing a sequence of control codes. The FSMs provide control signals for building a slot in accordance with a specific protocol. The sequencer core provides enabling signals to the FSMs to enable the proper FSM depending upon the mode of the transceiver. A conditional logic block is included in the sequencer core which detects special operation codes (opcodes) for each slot to cause the microcode sequence to jump to a certain routine if a condition is met or not met.

Sequencer employing conditional logic in a TDMA burst mode controller

A TDMA communication system having a selectable synchronization code receive window is described. To eliminate any false detections of a synchronization code, a selectable window is created during which the synchronization code is expected to appear. The size of the window is reduced once the synchronization code is detected. In one embodiment, the size of the window is based on the elapsed time since the last synchronization of the TDMA system.

Dynamic synchronization code detection window

A synchronization method for synchronizing a plurality of base stations in a TDMA communication system is disclosed. The synchronization topology may be via dedicated hardwire, via any DSL from the PSTN, or via an ad-hoc RF synchronization technique. Slots containing data are arranged in frames and these frames are transmitted to the base stations, and received from the base stations, by wireless telephone handsets. Each of the slots in a frame have a guard field comprising a plurality of guard bits. The base stations derive frame sync pulses via the received Unique Word correlation detect. These derived frame sync pulses are ultimately synchronized with frame sync signals received from the master base station. The slave base stations are maintained in synchronization with the master base station by using a phase locked loop (DPLL) which adds or deletes a final bit in the guard field of a frame to either advance or delay the frame sync pulse generated within the slave base station as necessary to maintain synchronization between the frame sync pulses generated by the slave base station and the frame sync pulses generated by the master base station.

Inter-base synchronization technique for a TDMA communication system

A method and apparatus increases spectrum efficiency in a wireless communication system having base stations which may be positioned to operate within range of one another. The method and apparatus eliminates the requirement for a base station to periodically transmit to maintain synchronization with an associated handset (504). The handset effectively assumes the role of a base station when making a call (508). The handset will synchronize with other handset traffic or another base station which is within range (506). The handset will then page the base station (510). Eliminating the requirement that the base station repeatedly transmit a signal to maintain sync with a handset significantly increases the available spectrum allocation for providing communication. Reversing the role of a handset also enables handset-to-handset communication independent of the base station (808).

Between a base station and a portable device

A method and structure for virtually eliminating any false detections of a synchronization code is described which creates a selectable window during which the synchronization code is expected to appear. A coincidental replication of the synchronization code outside the window does not trigger false synchronizations.

A method provide delays during memory dialing by automatically inserting pause characters within the dialing sequence based upon the user's entry of the dialing sequence. The method establishes a time-out period (64) when storing dialing sequences, and adds a pause character (66) to the dialing sequence if the time-out has expired. The method also determines whether any digit keys have been selected (68) to be stored in the sequence. Finally, the method monitors the tip and ring line of a standard telephone line to detect a far end ringing signal (76) and insert a special pause character (78). The special pause character will provide a delay until a far end pickup is detected during automatic dialing. Also, a circuit includes a keypad (20) for selecting digits to be stored; a control circuit (18) for detecting a delay between the selection of digits and generating a first pause signal in response; and a digital signal processor (30) for detecting a far end ringing signal to generate a second pause signal; and a memory device (26) for storing said digits and pause signals.

Circuit and method for automatic memory dialing

A method for transparently coupling an encrypted two-way RF communication unit (100) with an encrypted landline communication unit (104). An RF message comprised of a plurality of data frames (401,402, 403) is transmitted from the RF communication unit (100), wherein a plurality of the data frames include encrypted voice information (403). Some bits from the data frames (501,502) are selectively removed, without removing the encrypted voice information (503), to form reduced bit data frames, and the reduced bit data frames are transmitted via the landline to the landline communication unit (104).

Method for encryption sync compression in an encrypted radio telephone

In a wireless communication system comprising a plurality of fixed communication units (FCUs) (102) and portable communication units (PCUs) (120), each comprising an encryption synchronization counter (ESC) (314, 414), the PCU and FCU having a digital transmission format (201), a method of maintaining encryption and decryption throughout a hand-off is shown, comprising the steps of:

Method and apparatus for maintaining continuous synchronous encryption

In frequency-hopping spread-spectrum systems, it is necessary to maintain frequency and bit synchronization (sync) between the transmitter and receiver in order to maintain quality data recovery at the receiver. A protocol is described which includes a synthesizer lock field (109) to allow frequency sync, a clock sync field (123) to achieve quick clock sync, and a data sync field (125) to provide data sync. Other fields are provided in the protocol to allow both voice (141) and data (127) transmissions, inband signalling (139), and error correction (143). A method and apparatus, driven by a microprocessor (303) and ASIC (301) combination, are described that generate and transmit this protocol.

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Crystal Lake, IL, United States of America

Charles J Malek