Patent Number: 7,355,997

Title: Data rate shifting methods and techniques

Abstract: A technique for determining when to change a data rate by determining the cause of packet loss. The technique distinguishes between collision mediated packet loss and poor signal mediated packet loss. Rate shifting to a lower rate is performed after determining poor signals are causing packet loss. After switching to a lower rate, the packet loss rate can be compared to the pre-switch packet loss rate. If the packet loss rate has not improved by shifting to a lower data rate, then the data rate can be shifted to a higher rate. The technique can use a combination of channel response, signal strength, packet loss rate and throughput to determine when to switch data rates. A communication unit can maintain separate histories for each unit it is communicating with and employ a different data rate for each unit.

Inventors: Qian; Lu (Solon, OH), Lewis; Michael E. (Hartville, OH)

Assignee: Cisco Technology, Inc.

International Classification: H04Q 7/00 (20060101)

Expiration Date: 2020-04-08 0:00:00