Motorola Corporation

Motorola Mobility LLC

Jianping W Miller

Charbel Khawand

Bin Liu

Jean Khawand

Richard S Young

Shahriar Emami

Alejandro G Blanco

A method of communicating with a transceiver (). In one arrangement, the method of communicating with the transceiver can be performed in a systemless group environment. Synchronization information () can be received from a mobile transceiver () and used to synchronize to the mobile transceiver. The synchronization information can include a timing offset and a frequency offset. Synchronization can be maintained until a predetermined condition is met, for example, a predetermined amount of group inactivity.

Group call management through receive/transmit synchronization

An IPC protocol/network allows for intelligent targeting of nodes in order to reduce overhead and provide for improved power management. The IPC server keeps track of the IPC network's node activity and using an operational state table () it can determine which node can handle a service request (e.g., MP3 decode). By keeping track of the current operational condition of the nodes within the network, the processors can have better battery life and application latency can be improved. The IPC server will keep track not only of which nodes can handle which services, but it will also know which node can handle the service request given its knowledge of the operational state of each of the nodes.

Interprocessor communication protocol providing intelligent targeting of nodes

Half duplex, Frequency Hopped-Spread Spectrum wireless transceivers (), operating without a central controller, maintain time synchronization with the frequency hopping sequence for a period after transmission of a half duplex signal ceases. The wireless transceiver () operates their receivers () according to the RF frequency hopping sequence and schedule (). The wireless transceiver () is then able to send a short transmission request to signal that it will start transmitting on the Frequency Hopping schedule () of the previously ceased transmission. A wireless transceiver () that was either the original transmitter or the original receiver is able to transmit this transmission request. A subset of time slots within the hopping schedule () can be optionally assigned to the original transmitter and original receiver to obviate collisions of the transmit request transmissions from both device at the same time.

Fast synchronization for half duplex digital communications

A radio device requires a tunable transceiver such that the transceiver can be accurately set to a desired frequency. When a signal with known frequency accuracy is being received, an offset detector can determine the frequency offset generated by the transceiver due to improper tuning. An automatic frequency control (AFC) system (100) is comprised of a tunable transceiver, an offset detector (103) and an AFC control processor (105) for utilizing information from the offset detector to reduce the inaccuracy in frequency by tuning the transceiver towards the received signal frequency. The AFC control processor (105) utilizes one of more threshold levels for defining a maximum correction threshold (311) based upon the desired maximum offset correction. These thresholds are used by the AFC control processor (105) to efficiently control the predetermined frequency range of the tunable transceiver (101) for most efficient operation.

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Coral Springs, FL, United States of America

Jianping W Miller