Modes of Operation
According to RFC 3095 the ROHC scheme has three modes of operation:
- the Unidirectional mode (U-mode),
- the Bidirectional Optimistic mode (O-mode),
- the Bidirectional Reliable mode (R-mode).
Both the compressor and the decompressor starts in U-mode. They may then operate a transition to O-mode if a usable return link is available and the decompressor sends to the compressor a positive acknowledgement with O-mode specified. The transition to R-mode is achieved the same way.
Read more about this topic: Robust Header Compression
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