Motorola Corporation

James D McGrath

Hungkun J Chang

Thomas A Freeburg

Dale Robert Buchholz

Paul Odlyzko

Richard E White

William K Doss

Michael P Nolan

John M Kaczmarczk

Farzad Farhangnia

Mark Taylor

Jeffrey W Manning

In a wireless TDMA network a control module (CM) sends a time stamp relative to the beginning of its frame in a synchronization packet allowing each of a plurality of user modules (UM) to maintain synchronization relative to the CM. The CM uses a plurality of directional antennas and transmits the synchronization packets over each antenna over a predetermined number of frames. The UMs use a receive time stamp to identify the beginning of a received synchronization packet. The difference between the time stamps combined with a delay constant is used by the UMs to adjust time synchronization to the CM frame.

Synchronization method and apparatus for a wireless packet network

Multiple interrupt request data is stored in a queue and handled by a single interrupt sub-routine to provide a batch handling capability to maximize the interrupt handling efficiency of a microprocessor. Events are organized into groups having a common interrupt handling requirement and a data storage queue is provided for each group. At least one data word is stored for each event requiring interrupt attention in a respective queue. An interrupt handling routine upon a single call handles all data words within a queue before exiting the interrupt handling routine.

Linking microprocessor interrupts arranged by processing requirements

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Wheeling, IL, United States of America

James D McGrath