Method for Two-Domain Congestion Control

摘要

The transport protocol (TP) most commonly used today is TCP. TCP is a reliable transport protocol that Is also responsible for reducing the impact of network congestion Conventionally, TCP/IP networks signal congestion by dropping packets. TCP reacts to packet losses by controlling how packets are retransmitted, e.g., by dropping its transmission window size and then gradually increasing it (AIMD) to test for the available network capacity. The above mechanism is not optimal in the case when the client accesses the server through a wireless (e.g., RAN) domain (see Figure 1) mainly because of the different characteristics of the two (i.e., Internet and RAN) domains. The Internet domain in general requires a TCP-friendly (AIMD-like) functionality to achieve fairness between the competing Hows. Some access domains as the cellular networks today, however, control the resource sharing among the flows thus they do not require TCP-like CC, and would likely achieve a better performance by using a different CC, since they have different delay characteristics than the fixed bottlenecks.