Solution for WiMAX

The Effnet ROHC product portfolio consists of software products based on RObust Header Compression (ROHC) RFCs. ROHC is a header compression algorithm and protocol standardized by IETF. The Effnet ROHC product portfolio provides significant improvements in link efficiency for TCP traffic e.g. web, file transfers etc., RTP and UDP traffic e.g. real time, interactive and streaming applications and ESP traffic e.g. secure traffic over high BER, long RTT links.

ROHC is recommended by the WiMAX TWG Base Mobility Profile to maximise throughput efficiency. As per the WiMAX Forum Network Architecture Release 1.5 – Stage 3 for Detailed Protocols and Procedures Base specification, ROHC, in WiMAX TWG Base Mobility profile, is mandatory for MS/SS and BS. All products in the Effnet ROHC portfolio:

  • supports both IPv4 and IPv6.
  • have advanced feedback rate control mechanism which helps to reduce the compression-related information feedback across the airlink.
  • efficiently supports broadcast/multicast traffic, based on experience from 3GPP MBMS ROHC specification implementation.
  • have all the mandatory and optional features specified in the RFCs and additional efficiency improving features.
ROHC for WiMAX

WiMAX Forum Network Architecture Release 1.5 – Stage 3 for Detailed Protocols and Procedures Base specification for ROHC support describes the system architecture and signaling procedure for ROHC. It supports the following ROHC framework and profiles implemented in the form of various Effnet products:

Product Usage References
Effnet ROHC™ Uncompressed, RTP/UDP/IP, UDP/IP, ESP/IP RFC 3095, RFC 4815
Effnet ROHC-IP™ IP RFC 3843, RFC 4815
Effnet ROHC-TCP™ TCP/IP RFC 4996

The Effnet ROHC product portfolio can be optionally complemented with a test environment, Effnet HC-Sim™, which can simulate IP traffic with configurable link conditions, e.g. bit errors, packet loss, reordering etc.

Effnet Classifier and context manager

Packet classification and context management is essential to header compression. Effnet provides this additional module together with the Effnet ROHC product family.

Effnet ROHC™

The VoIP enabler on wireless networks! Effnet ROHC™ is an important component to efficiently run VoIP services over wireless networks. Most of the RTP applications use UDP for signaling purposes and there are also many stand-alone UDP applications, so the support for IP/UDP compression adds further to the efficiency. There is significant demand for secure exchange of information which leads to increased header overhead. The capability to compress IP/ESP, the header overhead in secure connections, makes it possible to run secure networks without additional bandwidth.

Effnet ROHC-IP™

As more and more networks are moving to support IP based communications, the number of nodes that require an IP address are increasing rapidly. The introduction of IPv6 should address this concern but at least during transition time, a lot of traffic will be sent via tunnels across networks. Effnet ROHC-IP™ is capable of compressing layers of IP headers thus making it possible to run tunneled traffic without need for additional bandwidth.

Effnet ROHC-TCP™

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.

*Packet size studies at www.caida.org