ROHC 学习记录
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目前rohc-lib.org 1.7.0 版本的局限性
1./* R-mode is not supported yet */
2.
1. 最开始时rfc3095 定义了ROHC框架和几个协议,后来人们反应太复杂难理解有错误,后来就补充了各种独立的协议。比如
4815 (修正3095,两个结合着看)
This document provides corrections, additions, and clarifications to RFC 3095; this document thus updates RFC 3095. In addition, other clarifications related to RFC 3241 (ROHC over PPP), RFC 3843 (ROHC IP profile) and RFC 4109 (ROHC UDP-Lite profiles) are also provided.
3759 -->
This document aims at clarifying these aspects of ROHC, discussing terms such as ROHC instances, ROHC channels, ROHC feedback, and ROHC contexts, and how these terms relate to other terms, like network elements and IP interfaces, commonly used, for example, when addressing MIB issues.
5795
this document explicitly defines the ROHC framework and the profile for uncompressed separately. More specifically, the definition of the framework does not modify or update the definition of the framework specified by RFC 3095.
3843, This document defines a ROHC compression profile for IP, similar to the IP/UDP profile defined by RFC 3095, but simplified to exclude UDP, and enhanced to compress IP header chains of arbitrary length.
4996
This document specifies a ROHC (Robust Header Compression) profile for compression of TCP/IP packets. The profile, called ROHC-TCP, provides efficient and robust compression of TCP headers, including frequently used TCP options such as SACK (Selective Acknowledgments) and Timestamps. ROHC-TCP works well when used over links with significant error rates and long round-trip times. For many bandwidth-limited links where header compression is essential, such characteristics are common.
UDP 的压缩就在整体文档里3095和4815下面就说3095 的协议理解和记录
4.3 Compression and decompression states
Both machines start in the lowest compression state and transit gradually to higher states. Transitions need not be synchronized between the two machines. In normal operation it is only the compressor that temporarily transits back to lower states. The decompressor will transit back only when context damage is detected.
4.3.1 compressor states
+----------+ +----------+ +----------+ | IR State | <--------> | FO State | <--------> | SO State | +----------+ +----------+ +----------+
4.3.1.1
压缩端发了原始包并携带了additional information。 压缩端保持IR状态直到很确定解压缩端能收到static information correctly.Initialization and Refresh (IR) State
FO first order 的目的就是发送一些没规律的,变化的字段。 SO second order 应用场景就是uniform pattern。就是发送的数据包头全部都是一样的模式,根据Sn的递增规律能完全推断整个header的各个字段。
4.3.2. Decompressor states
+--------------+ +----------------+ +--------------+ | No Context | <---> | Static Context | <---> | Full Context | +--------------+ +----------------+ +--------------+
4.4 Modes of operation
The ROHC scheme has three modes of operation, called Unidirectional, Bidirectional Optimistic, and Bidirectional Reliable mode.
U mode
一开始都是从U mode开始,除非收到decompressor replied a feedback indicating that a mode transtion is desired.
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- ROHC 学习记录
- ROHC协议简介
- ROHC 一些备忘
- 报头压缩-ROHC基本概念
- ROHC报头压缩
- ROHC源代码阅读日志(1)
- 【VOLTE】ROHC 健壮性包头压缩
- 报头压缩-ROHC压缩系统
- 报头压缩-ROHC数据结构/参数设置
- 报头压缩-ROHC报文/校验/编码
- 报头压缩-ROHC报头压缩简单示例
- 报头压缩-ROHC报头压缩程序改进
- --学习记录
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