для Cisco Cisco IOS Software Release 12.4(22)XR
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Cisco Packet Data Serving Node Release 5.5 for Cisco IOS Release 12.4(22)XR9
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Robust Header Compression
Robust Header Compression
In many mobile services and applications, the payload size of an IP packet is smaller than the IP header.
These services and applications include VoIP, interactive games, and text messaging.
These services and applications include VoIP, interactive games, and text messaging.
A full size IP header is required to successfully route a packet through a complex network. However, the
full size header is not required for the packet to travel a single link in that journey. You can compress the
header for travel across the one link. This can reduce the size of the header by 90% or more. The smaller
header size saves bandwidth and uses network resources more efficiently. Header compression also
reduces packet loss and improves the interactive response time.
full size header is not required for the packet to travel a single link in that journey. You can compress the
header for travel across the one link. This can reduce the size of the header by 90% or more. The smaller
header size saves bandwidth and uses network resources more efficiently. Header compression also
reduces packet loss and improves the interactive response time.
PDSN uses Robust Header Compression (ROHC) for compressing and decompressing the SO 67(Aux
A10) traffic between MN and PDSN. ROHC is an efficient and robust compression scheme. This is
required due to the high BER and long RTT common on 2.5G and 3G links.ROHC compresses excess
protocol headers before transmitting them across a link. It uncompresses them at the other end of the
link. The redundant header fields of the packet allow compression. You can also compress consecutive
packets in the same packet stream. ROHC uses an extendible framework of packet stream profiles. The
profiles include IP/UDP/RTP, IP/ESP, IP/UDP and Uncompressed
A10) traffic between MN and PDSN. ROHC is an efficient and robust compression scheme. This is
required due to the high BER and long RTT common on 2.5G and 3G links.ROHC compresses excess
protocol headers before transmitting them across a link. It uncompresses them at the other end of the
link. The redundant header fields of the packet allow compression. You can also compress consecutive
packets in the same packet stream. ROHC uses an extendible framework of packet stream profiles. The
profiles include IP/UDP/RTP, IP/ESP, IP/UDP and Uncompressed
The ROHC standard is detailed in IETF RFC 3095 and related RFCs.