Robust Header Compression (ROHC) compresses packet header information for more efficient transmission of data. Compression is achieved through various reliable modes set by the transmitter and receiver. The Initialization and Refresh (IR) state is the first state of the compressor. This provides a complete, uncompressed context of the data being transmitted. In typical operation, the ROHC compressor periodically transmits an IR packet that provides background information that allows the ROHC decompressor to decompress one or more packets following the IR packet. However, under certain conditions, such as starting the decompressor, it may be possible for the decompressor to miss the IR packet. A method and apparatus are described wherein the decompressor uses the next received IR packet to decompress the previous packet where the decompressor did not receive the background information.
展开▼
