Protocol Action: A Link-Layer Assisted ROHC Profile for IP/UDP/RTP to Proposed Standard
The IESG <iesg-secretary@ietf.org> Wed, 30 January 2002 15:34 UTC
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From: The IESG <iesg-secretary@ietf.org>
Subject: Protocol Action: A Link-Layer Assisted ROHC Profile for IP/UDP/RTP to Proposed Standard
Date: Wed, 30 Jan 2002 10:09:50 -0500
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The IESG has approved the Internet-Draft 'A Link-Layer Assisted ROHC Profile for IP/UDP/RTP' <draft-ietf-rohc-rtp-lla-03.txt> as a Proposed Standard. In the same action, the IESG approved publication of Requirements and assumptions for ROHC 0-byte IP/UDP/RTP compression <draft-ietf-rohc-rtp-0-byte-requirements-02.txt> as an Informational RFC. These documents are the product of the Robust Header Compression Working Group. The IESG contact persons are Allison Mankin and Scott Bradner. Technical Summary This document set defines a ROHC profile for compression of IP/UDP/RTP packets that leverages functionality provided by the lower layers by completely eliminating the header for most packets during optimal operation. The requirements on the enabling lower layer functionality are discussed by the 0-byte requirements document. The motivation is not super-optimization (squeezing out that last octet) but the adaptation of the RFC 3095 profile to existing, older air interfaces (such as those based on GSM) in which the single octet ROHC header pushes a packet voice stream into the next higher fixed packet size of the link. The ROHC RTP profile (RFC 3095) allows more flexible air interfaces to attain excellent spectrum efficiency with RTP media, and this profile extends that result to a larger set of deployed environments. Working Group Summary There was initially working group dissent about the goal of a 0-byte header compression, but the work settled into showing compatibility with RFC 3095 and applicability to significant air-interfaces and traffic usages on them (the profile is expected to see use on GPRS and CDMA2000). Experimental implementations were reported on during the development of the draft, from both Nokia and Ericsson. Results of both experiment and discussion led to providing only Unidirectional and Optimistic bidirectional types of RFC 3095 in this spec (U-mode and O-mode) and for the support for Reliable bidirectional (R-mode) to be separated into its own draft. Protocol Quality Allison Mankin reviewed the documents for the IESG. Coding and testing were reported throughout the draft development, and there was extensive working group review of the applicability as well as the protocol.