Protocol Action: 0-byte Support for R-mode in Link-Layer Assisted ROHC Profile to Proposed Standard
The IESG <iesg-secretary@ietf.org> Tue, 10 September 2002 15:06 UTC
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From: The IESG <iesg-secretary@ietf.org>
Subject: Protocol Action: 0-byte Support for R-mode in Link-Layer Assisted ROHC Profile to Proposed Standard
Date: Tue, 10 Sep 2002 10:56:36 -0400
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The IESG has approved the Internet-Draft '0-byte Support for R-mode in Link-Layer Assisted ROHC Profile' <draft-ietf-rohc-rtp-lla-r-mode-02.txt> as a Proposed Standard. The IESG also approved publication of Lower Layer Guidelines for Robust RTP/UDP/IP Header Compression <draft-ietf-rohc-rtp-lower-layer-guidelines-03.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 The "0-byte Support for R-mode in Extended Link-Layer Assisted RObust Header Compression Profile" defines an additional mode of the profile defined in "A Link-Layer Assisted ROHC Profile for IP/UDP/RTP" (now in the RFC Editor's queue). That document specified zero-byte header compression in order to avoid the single octet ROHC header in certain older air interfaces from pushing a packet voice stream into the next higher fixed packet size for the radio. The former document defined the zero-byte operation for Unidirectional and Optimistic modes only (U-mode and O-mode), but Reliable Bidirectional mode (R-mode) required additional work. This specification completes the Link-Layer Assisted 0-byte profile with R-mode, with the result that the majority of ROHC RTP packets can be sent out (on radio links with the defined characteristics) with a header-free packet format during normal operation. The "Lower Layer Guidelines for Robust RTP/UDP/IP Header Compression" document describes requirements that RObust Header Compression puts on lower layers, especially aimed at those who are engineering and deploying emerging radio systems such as those specified by 3GPP, 3GPP2, ETSI, etc, to simplify incorporation of ROHC technology, and limit the amount of detail about the ROHC algorithms and protocols that need to be understood by link layer designers or engineers. Both general guidelines and guidelines specific for cellular systems are provided. Working Group Summary The working group supported the publication of both of these documents. Protocol Quality These documents were reviewed for the IESG by Allison Mankin. As noted, the Reliable-Mode specification was held in the WG for extra rounds of review, and the working group and IETF Last Calls did not raise issues.