RFC 3738 (rfc3738) - Page 2 of 32

Wave and Equation Based Rate Control (WEBRC) Building Block

RFC 3738                  WEBRC Building Block                April 2004


Table of Contents

   1.  Introduction. . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Rationale . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Functionality . . . . . . . . . . . . . . . . . . . . . . . .   6
       3.1. Sender Operation . . . . . . . . . . . . . . . . . . . .   9
            3.1.1. Sender inputs and initialization. . . . . . . . .   9
            3.1.2. Sending packets to the session. . . . . . . . . .  10
       3.2. Receiver Operation . . . . . . . . . . . . . . . . . . .  12
            3.2.1. Receiver inputs and initialization. . . . . . . .  12
            3.2.2. Receiver measurements and calculations. . . . . .  13
                   3.2.2.1. Average loss probability . . . . . . . .  13
                   3.2.2.2. Average round-trip time. . . . . . . . .  16
                   3.2.2.3. Rate Equation. . . . . . . . . . . . . .  16
                   3.2.2.4. Epochs . . . . . . . . . . . . . . . . .  17
                   3.2.2.5. Average reception rate . . . . . . . . .  17
                   3.2.2.6. Slow start . . . . . . . . . . . . . . .  19
                   3.2.2.7. Target rate. . . . . . . . . . . . . . .  20
            3.2.3. Receiver events . . . . . . . . . . . . . . . . .  20
                   3.2.3.1. Packet reception . . . . . . . . . . . .  20
                   3.2.3.2. First packet after join. . . . . . . . .  20
                   3.2.3.3. Time slot change . . . . . . . . . . . .  20
                   3.2.3.4. Loss event . . . . . . . . . . . . . . .  21
                   3.2.3.5. Epoch change . . . . . . . . . . . . . .  21
                   3.2.3.6. Join the next higher layer . . . . . . .  21
                   3.2.3.7. Join timeout . . . . . . . . . . . . . .  23
                   3.2.3.8. Exceptional timeouts . . . . . . . . . .  23
   4.  Applicability Statement . . . . . . . . . . . . . . . . . . .  23
       4.1. Environmental Requirements and Considerations. . . . . .  23
   5.  Packet Header Fields. . . . . . . . . . . . . . . . . . . . .  25
       5.1. Short Format Congestion Control Information. . . . . . .  26
       5.2. Long Format Congestion Control Information . . . . . . .  27
   6.  Requirements From Other Building Blocks . . . . . . . . . . .  28
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  28
   8.  References. . . . . . . . . . . . . . . . . . . . . . . . . .  29
       8.1. Normative References . . . . . . . . . . . . . . . . . .  29
       8.2. Informative References . . . . . . . . . . . . . . . . .  30
   9.  Authors' Addresses. . . . . . . . . . . . . . . . . . . . . .  31
   10. Full Copyright Statement. . . . . . . . . . . . . . . . . . .  32












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