Header compression of multimedia data transmitted over a...

H - Electricity – 04 – L

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H04L 29/06 (2006.01) H04L 12/28 (2006.01)

Patent

CA 2566125

Methods and apparatus are described for improving the transmission of multimedia data over wireless communication channels. These techniques include determining a physical layer packet size of the wireless communication system and determining a maximum size of a compressed header. Then, partitioning an information unit, wherein the size of the partitions are selected such that after a partition is encoded the aggregate size of the encoded partition and the compressed header are the size of the physical layer packet, or less. The techniques can be used for various types of information units, such as multimedia data, variable bit rate data streams, video streams, video teleconference stream, or voice over IP. The techniques can also be used with various over the air interfaces, such as, Global System for Mobile Communication (GSM), General Packet Radio Service (GPRS), Enhanced Data GSM Environment (EDGE), or standards based on CDMA such as TIA/EIA-95-B (IS-95), TIA/EIA-98-C (IS-98), IS2000, HRDP, cdma2000, Wideband CDMA (WCDMA), and others.

Cette invention se rapporte à des procédés et à un appareil pour améliorer la transmission de données multimédia sur des canaux de communication sans fil. Ces techniques consistent à déterminer la taille d'un paquet de couche physique du système de communication sans fil et à déterminer une taille maximum d'un en-tête comprimé. Ces techniques consistent ensuite à segmenter en partitions une unité d'informations, la taille des partitions étant sélectionnée de telle sorte que, après codage d'une partition, la taille totale de la partition codée et de l'en-tête comprimé est égale ou inférieure à la taille du paquet de couche physique. Ces techniques peuvent être utilisées pour divers types d'unités d'information, telles que des données multimédia, des flux de données de débit binaire variable, des flux vidéo, des flux de téléconférence vidéo ou des séquences vocales sur protocole Internet (VOIP). Ces techniques peuvent également être utilisées avec diverses interfaces de communication aérienne, telles que GSM (Global System for Mobile Communication), GPRS (General Packet Radio Service), EDGE (Enhanced Data GSM Environment), ou des standards basés sur CDMA, tels que TIA/EIA-95-B (IS-95), TIA/EIA-98-C (IS-98), IS2000, HRDP, cdma2000, CDMA à bande large (WCDMA) et autres.

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