5G • RAN
RoHC
Robust Header Compression
RFC 5795 algorithm implemented in PDCP compressing IP, UDP, and RTP headers from 40-60 bytes down to 2-3 bytes.
Technical Explanation
In VoIP and real-time streaming, IP/UDP/RTP headers (40 bytes for IPv4, 60 bytes for IPv6) exceed the size of the speech payload (32 bytes). RoHC tracks static and predictable header fields (IP addresses, sequence numbers, timestamps), transmitting only compressed 1-3 byte deltas over the air to boost spectral efficiency.
Key Functions
- Compresses 40-60 byte IP/UDP/RTP headers down to 1-3 bytes
- Boosts VoNR and multimedia capacity by over 60%
- Executed natively within the 5G PDCP sublayer
Specifications
3GPP TS 38.323, IETF RFC 5795
Interfaces
Uu
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