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AssigneeThomson Licensing
InventorsZhi Gang Zhang, Huan Qiang Zhang, Charles Chuanming Wang
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The invention is related with network communication, in particular wireless networking. In order to improve bandwidth utilization, a header compression protocol is implemented in most wireless network systems, such as robust header compression ROHC for WLAN systems. When using multicast groups for data communication problems with ROHC are related with relative late initiation of stations that newly enter the multicast group. The invention proposes an improved state machine for the compressor in order to overcome this drawback. It is also proposed an improvement for the decompressors which omit sending positive acknowledgements in order to further improve compression efficiency. The invention also concerns an accordingly improved method for the exchange of data packets in a network of distributed stations.
Method for the exchange of data packets in a network of distributed stations, wherein a data compression protocol is used for compressing the data packets, wherein a compressor comprises a number of states among them an initialization state with low or none compression of the data packets and at least one compression state with higher or full compression of the data packets, wherein the compressor sends the compressed packets to one or more decompressors in the network building a multicast group, wherein the compressor performs a transition back to initialization state (IR) if it is found that a decompressor has newly joined the multicast group.
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