Packet radio system, and a terminal equipment for a packet...

H - Electricity – 04 – L

Patent

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Details

H04L 12/56 (2006.01) H04L 29/06 (2006.01) H04Q 7/20 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2209944

A packet radio system encapsulates data packets of external data networks by a point-to-point protocol PPP (Fig. 4A, 4B), and passes them through one or more sub-networks to a point which supports the protocol of the encapsulated data packet. In addition, a special radio link protocol of the packet radio network is required on the radio interface between a mobile data terminal equipment and a support node. PPP packets are encapsulated in data packets of said radio link protocol. The disadvantage of the arrangement is that the data packets of both the PPP protocol and the radio link protocol contain protocol-specific control fields, which reduces the transmission capacity of user information. Therefore, a PPP packet is compressed (Fig. 4C) before the encapsulation (Fig. 4D) by removing therefrom the unnecessary control fields. After having been transferred over the radio interface, the PPP packet is decompressed into its original format (Fig. 4F, 4G).

Système radio permettant d'encapsuler des paquets de données de réseaux de données externes selon un protocole de point à point PPP (fig. 4A, 4B) et de les transmettre par l'intermédiaire d'un ou plusieurs sous-réseaux vers un point qui utilise le protocole du paquet encapsulé. En outre, un protocole de liaison radio spécial (SRLP) du réseau radio de transmission de paquets doit être appliqué à l'interface radio reliant un équipement terminal de données mobiles et un noeud de prise en charge. Les paquets PPP sont encapsulés en paquets de données SRLP. L'inconvénient est que les paquets de données PPP et SRLP contiennent des champs de contrôle spécifiques au protocole, ce qui réduit la capacité de transmission de l'information d'usager. Par conséquent, on comprime un paquet PPP (fig. 4C) avant l'encapsulation (fig. 4D) en le dépouillant des champs de commandes non nécessaires. Après transfert sur l'interface radio, le paquet PPP est décomprimé et reprend son format d'origine (fig. 4F, 4G).

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