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Ring Tones

Method-and-apparatus-for-optimizing-receiver-synchronization-in-a-radio-communication-system

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Method and apparatus for optimizing receiver synchronization in a radio communication system

Details

Inventors: Ayerst, Douglas I.; Dehner, Jr., Leo G.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Horabik; Michael
Assistant Examiner: Wilson, Jr.; William H.
Attorney, Agent or Firm: Lamb; James A.

A fixed system receiver (107) operates in a synchronization mode which is one of a synchronous mode and an asynchronous mode. A system controller (102) transmits a response command which includes a preamble indicator corresponding to the synchronization mode of the fixed system receiver (107). A selective call radio (106) receives and decodes the preamble indicator and generates a response message data unit (312). The synchronous header data packet (660) is preceded by a synchronizing packet (650) when the preamble indicator indicates the asynchronous mode and is not preceded by the synchronizing packet (650) when the preamble indicator indicates the synchronous mode. The selective call radio (106) transmits the response message data unit (312). The fixed system receiver (107) acquires symbol recovery timing and synchronizes to data packet boundaries of the response message data unit (312), using the synchronizing packet (650) when included.

DETAILED DESCRIPTION Accordingly, in a first aspect of the present invention, a method used in a radio communication system optimizes a fixed system receiver synchronization.
The radio communication system has a fixed system receiver which operates in a synchronization mode which is one of a synchronous mode and an asynchronous mode.
A response message data unit having a synchronous header data packet is transmitted by a selective call radio and received by the fixed system receiver.
In a system controller the method includes the step of transmitting a response command which includes a preamble indicator corresponding to the synchronization mode of the fixed system receiver.
In a selective call radio the method includes the steps of receiving and decoding; generating; and transmitting.
In the step of receiving and decoding, the selective call radio receives and decodes the response command including the preamble indicator.
In the step of generating, the selective call radio generates the response message data unit having a data rate.
The synchronous header data packet is preceded by a synchronizing packet when the preamble indicator indicates the asynchronous mode and is not preceded by the synchronizing packet when the preamble indicator indicates the synchronous mode.
In the step of transmitting, the selective call radio transmits the response message data unit.
In the fixed system receiver the method includes a step of acquiring symbol recovery timing and synchronizing the fixed system receiver to data packet boundaries of the response message data unit, using the synchronizing packet, when the fixed system receiver is in the asynchronous mode and the synchronizing packet and synchronous header are received.
In the fixed system receiver the method further includes a step of receiving the response message data unit.
Accordingly, in a second aspect of the present invention, a method used in a selective call radio optimizes a fixed system receiver synchronization.
The selective call radio operates in a radio communication system

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