Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2006-04-18
2006-04-18
Kincaid, Lester G. (Department: 2687)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S503000, C455S517000, C455S515000, C455S507000, C455S509000, C455S414100, C455S414400, C370S350000, C370S503000, C375S272000, C375S354000
Reexamination Certificate
active
07031736
ABSTRACT:
A method and apparatus for packet-data header decompression, particularly advantageous for use in connection with broadcast and multicast messages being transported through a radio telecommunication system operable according to the CDMA 2000 standard. When a mobile subscriber desires broadcast content from a content server, the mobile station sets up a PPP session for submitting the request and negotiating security protocols. When a subscription is granted, the mobile station receives broadcast content that has undergone header compression. In order to synchronize its decompressor, the mobile station receives a full header from a PDSN. The full header is preferably sent out on a periodic basis just for this purpose. The frequency of full-header transmissions by the PDSN is increased from a normal mode to a high full-header frequency (HFHF) mode upon receiving a request for a full header from a mobile station, but returns to normal-mode full-header transition frequency after receiving an ACK message from the requesting mobile indicating successful decompressor synchronization, or upon the expiration of a predetermined HFHF-mode maximum duration.
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Cheng Mark W.
Hsu Liangchi
Le Khiem
Thinh Nguyenphu
Alston & Bird LLP
Kincaid Lester G.
Nguyen Khai
Nokia Corporation
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