Method of transporting a multipoint stream in a local area network and device for connection implementing the method
View Patent ↗Within the framework of a wireless local area network, the reliability of the transporting of the multicast streams is not enhanced by an acknowledgement of receipt mechanism. To improve this reliability the invention proposes a method of transporting packets transmitted in multicast mode by a device for connection between a first network and a second network, the multicast packets originating from the second network destined for clients of the first network, characterized in that it comprises a step of reception of multicast packets and the despatching according to a unicast transmission mode of at least certain packets transmitted in multicast mode to at least one of the clients of the first network that are subscribers to the transmission group.
1. Method optimizing reliability of transmission of packets received in multicast mode from a first network to multicast transmission mode clients of a wireless second network, said method being implemented by a wireless access point device connecting said first network and said second network, said clients being directly connected to said wireless access point device through wireless connections and said packets originating from said first network being destined for clients of said second network, said method comprising the steps of:
intercepting at least one subscription request to at least one multicast transmission group address, said at least one subscription request being sent to said first network by at least one of said clients of said second network, and transmission of said at least one subscription request to said first network;
receiving from said first network, at least one multicast packet that is transmitted from said first network to said at least one multicast transmission group address;
encapsulating at least a fragment of said at least one multicast packet transmitted from said first network into at least one unicast media control access layer packet; and,
transmitting said at least one unicast media control access layer packet to each of said at least one of said clients of said second network that are subscribers to said multicast transmission group.
2. Method according to claim 1 wherein said second network comprising only one client, said packets received in multicast mode are transmitted directly in unicast mode to this one client.
3. Method optimizing reliability of transmission of packets received in multicast mode from a first network to multicast transmission mode clients of a wireless second network, said method being implemented by a wireless access point device connecting said first network and said second network, where said second network is a wireless network implementing at least one protocol from the 802.11 family, said packets originating from said first network being destined for clients of said second network, said clients being directly connected to said wireless access point device through wireless connections, said method comprising the steps of:
intercepting at least one subscription request to at least one multicast transmission group address, said at least one subscription request being sent to said first network by at least one of said clients of said second network, and transmission of said at least one subscription request to said first network;
receiving from said first network at least one multicast packet transmitted from said first network to said at least one multicast transmission group address;
encapsulating at least a fragment of said at least one multicast packet transmitted from said first network into at least one unicast media control access layer packet; and,
transmitting said at least one unicast media control access layer packet to each of said at least one of the clients of the first second network that are subscribers to said multicast transmission group.
4. Method according to claim 3 wherein said second network comprising only one client, the packets received in multicast mode are transmitted directly in unicast mode to this one client.
5. Method optimizing reliability of transmission of packets, received in multicast mode from a first network to multicast transmission mode clients of a wireless second network, by a wireless access point device connecting said first network and said second network, said clients being directly connected to said wireless access point device through wireless connections and said packets originating from said first network being destined for clients of said second network, said method comprising the steps of:
intercepting at least one subscription request to at least one multicast transmission group address from at least one of said clients of the said second network that is a subscriber to a multicast transmission group, said at least one subscription request being sent to said second network by at least one of said clients of the second network;
associating said multicast transmission group to at least one media access control address of said at least one of said clients being an origin of said at least one subscription request, said media access control address corresponding to an interface of said at least one of said clients that is a subscriber to said transmission group;
receiving from said second network at least one multicast packet transmitted from said first network to said at least one multicast transmission group;
encapsulating at least a fragment of said at least one multicast packet transmitted from said first network into at least one media access control packet; and,
transmitting said at least one unicast media access control packet to said media access control address corresponding to an interface of said at least one of said clients when an association exists between a transmission group of said at least one multicast packet and said at least one media access control address.