Header Compression Schemes for Wireless Internet Access
نویسندگان
چکیده
3 Header Compression Schemes for Wireless Channels 16 3.1 Drawback of Existing Schemes on Wireless Links . . . . . . . . . . . . . . 16 3.2 Robust Header Compression (ROHC) . . . . . . . . . . . . . . . . . . . . 16 3.3 Context and States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.4 Compression of Header Fields . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.4.1 Compressor States . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.4.2 Decompressor States . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.5 Modes and State Transitions . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.5.1 Unidirectional Mode (U–Mode) . . . . . . . . . . . . . . . . . . . . 21 3.5.2 Bidirectional Optimistic Mode (O–mode) . . . . . . . . . . . . . . 22 3.5.3 Bidirectional Reliable Mode (R–mode) . . . . . . . . . . . . . . . . 23 3.6 Timer based compression of RTP timestamps . . . . . . . . . . . . . . . . 23 3.7 List Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.8 More Profiles: TCP, IP–only, UDP–lite . . . . . . . . . . . . . . . . . . . 24 3.9 ROHC over Wireless Ethernet Media . . . . . . . . . . . . . . . . . . . . . 25 3.10 Signaling Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.11 ROHC Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.12 Evaluation of ROHC Performance for Multimedia Services . . . . . . . . . 26 3.13 Deployment of Header Compression in Cellular Networks . . . . . . . . . 28
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