Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2008-05-13
2008-05-13
Feild, Joseph (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C370S338000, C370S351000, C375S340000
Reexamination Certificate
active
07373145
ABSTRACT:
Techniques for use by a data communication device in maintaining communication with a packet-switched communication network which allows data to be pushed to the data communication device are described. One illustrative technique involves maintaining operation in a network coverage state associated with network coverage between the data communication device and the communication network while receiving a network signal that is above a predetermined adequate signal strength; further maintaining operation in a network coverage state associated with network coverage between the data communication device and the communication network while receiving a network signal that is below the predetermined adequate signal strength but successfully decoding one or more predetermined network messages; and maintaining operation in a network coverage loss state associated with network coverage loss between the data communication device and the communication network while failing to successfully decode one or more predetermined network messages. An update message may be transmitted to the communication network based on identifying the network coverage loss.
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Doan Phuoc
Feild Joseph
Oskorep, Esq. John J.
Research In Motion Limited
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