Reliable multicast broadcast in wireless networks

摘要

A mechanism is provided for transmitting a multicast session to a plurality of receivers over a wireless network. A forward error correction (FEC) overhead and a transmission rate are determined for transmission of a next data block of the multicast session based on received channel conditions. The next data block is multicast using the determined FEC overhead and transmission rate. Responsive to an indication of common missing packets from the next data block from more than one receiver in the plurality of receivers, the common missing packets are multicast to the plurality of receivers using the determined FEC overhead and transmission rate. Responsive to an indication of uncommon missing packets from the data block from one or more receivers, for each receiver in the one or more receivers, the uncommon missing packets identified by the receiver are unicast using the determined FEC overhead and transmission rate.

主权项

1. A method, in a data processing system, for transmitting a multicast session to a plurality of receivers over a wireless network, the method comprising:
determining a forward error correction overhead and a transmission rate for transmission of a next data block of the multicast session based on channel conditions received from the plurality of receivers for a previous data block, wherein the channel conditions comprise a layer 2 packet loss rate for the previous data block, a layer 7 packet loss rate for the previous data block, and a modulation rate used for transmission of the previous data block; multicasting the next data block using a result of determining the forward error correction overhead and the transmission rate; responsive to an indication of common missing packets from the next data block from more than one receiver in the plurality of receivers, multicasting the common missing packets to the plurality of receivers using the result of determining the forward error correction overhead and the transmission rate; and responsive to an indication of uncommon missing packets from the next data block from one or more receivers in the plurality of receivers, for each receiver in the one or more receivers, unicasting the uncommon missing packets identified by the receiver using the result of determining the forward error correction overhead and the transmission rate.