Effnet provides a highly portable, efficient and fully compliant software implementation of RObust Header Compression TCP (ROHC-TCP) technology which is based on IETF standards RFC 4995 and RFC 4996 published in 2007. Effnet's research and development team has been actively involved in the standardization process. Effnet ROHC-TCP™ provides significant link efficiency improvements for TCP traffic e.g web, email etc and particularly for TCP acknowledgement packets. It is robust and maintains high compression efficiency even in presence of high BER, long RTT, packet loss and pre- and on-link reordering.
Both IPv4 and IPv6 are supported, with extension headers.
Support for AH, GRE, MINE and ESP-NULL headers.
The 3GPP LTE specification recommends ROHC-TCP for efficient use of radio resources. The WiMAX TWG Base Mobility Profile recommends it to maximize throughput efficiency. Satellite mobile broadband systems like BGAN, GMR can efficiently deliver their broadband services using Effnet ROHC-TCP™. The software supports broadcast and multicast applications as well as unidirectional and bi-directional links. It can also be used on various types of satellite links such as DVB-S, DVB-S2, DVB-RCS. Effnet ROHC-TCP™ provides improved bandwidth efficiency when used together with Protocol Enhancement Proxies on satellite networks, bandwidth optimization techniques in WAN optimizers, TCP accelerators and on backhaul links.
Multiple Internet packet size studies* are in agreement that at least 40% of all IPv4 packets carry no or only a few bytes of payload i.e. packet sizes are at or very near to header size (IPv4+TCP). One study of IPv6 packets shows the same trend. Even more remarkable in that study is that for IPv6, 60-80% of the packets carry more header data than packet data. Effnet ROHC-TCP™ would be very beneficial in these cases.
|Average packet size (w/o ROHC) (bytes)||Average packet size (w ROHC) (bytes)||Savings (%)|
|TCP Ack (w/o options)||40||10||75|
|TCP Ack (Timestamp)||52||13||75|
*Packet size studies at www.caida.org
Effnet ROHC-TCP™ is a member of the Effnet Header Compression family. All products work together seamlessly and are easy to integrate into customer’s products. One or more products can be delivered as a package to fulfill requirements of standards e.g. complete Effnet ROHC™ family for 3GPP LTE, Effnet ROHC™ and Effnet ROHC-TCP™ for WiMAX.
Effnet ROHC-TCP™ is designed to be easily adapted to a variety of operating systems and hardware platforms. The implementation is developer-friendly and available both for user space, kernel space, debugging and testing and for link layer integration such as PPP according to RFC 3241.
The classification and context management is an essential component of header compression function. Even though RFC 4995 and RFC 4996 do not standardize it, Effnet provides this component together with Effnet ROHC-TCP™. The classifier and context manager provides following functions:
Effnet provides support and maintenance services covering problem reporting, bug fixes, updates, training, consulting and integration. A sample application code together with detailed documentation covering well defined and easy to use API is provided to speed up the process of integration.