Motorola Corporation

Enrique E Calistro

Troy A Bailey

Robert S Flippo

In a communication system ( ) having transmitters ( ) for transmitting location information to subscriber units ( ) located with the transmitters' coverage areas, a method of determining the location of a subscriber unit. At least some of the transmitters use different assigned time intervals to transmit their information, and a subscriber unit receiving such information can determine its location based, at least in part, on the time interval during which it received information. Received location information is stored in a dedicated portion ( ) of a subscriber unit's memory for later retrieval by the user. In a two-way system, a subscriber unit can transmit its stored location information to a system receiver ( ) for storage in a system memory ( ). The system memory ( ) is accessed by a system operator or other authorized person to determine the location of a subscriber unit and/or its pattern of movement throughout the coverage areas.

Method of locating a subscriber unit within the coverage area of a communication system

A selective call receiver (102) for use in a communication system (100) includes a receiver (404), a memory (412), and a processor (408). The receiver (404) is capable of receiving a message code (314) during a first frame from a first transmitter and the same message code (314) during a second frame from a second transmitter. The memory (412) stores a first and a second canned message, wherein the first canned message corresponds to the message code (314) being received in the first frame and the second canned message corresponds to the same message code (314) being received in the second frame. The processor (408) is responsive to the message code (314) for identifying the first canned message in the memory (412) corresponding to the message code (314) and the first frame, and identifying the second canned message in memory (412) corresponding to the same message code (314) and the second frame.

Method for transmitting local area/wide area messages and selective call

A method in a communication system (100) having a high power transmitter (104) for transmitting messages to selective call receivers (102) located within a wide coverage area (114), and having at least one low power transmitter (108) for transmitting messages to selective call receivers (102) located within a smaller, overlapping coverage area (112). The transmitters (104,108) transmit on the same frequency but during different time intervals, except that mutually remote, low power transmitters can transmit simultaneously. A selective call receiver (102), adapted to operate in the communication system, and having a special arrangement of canned messages (412), can determine its location based, at least in part, on the time interval during which it received a message.

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Cooper City, FL, United States of America

Enrique E Calistro