Wireless LAN using RSSI and BER parameters for transmission rate adaptation
US7369510B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2004 |
| Grant date | May 6, 2008 |
| Priority date | — |
| Expiry date | Jan 24, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Dynamic conditions present in a channel can quickly degrade signal quality, thereby reducing the data rate usable by a WLAN transmitter. For maximum throughput, the highest, reliable data rate available should be used. In accordance with one feature of an adaptive rate technique, a lookup RSSI from one or more acknowledgment packets can be determined. One or more valid data rates can then be determined, wherein a valid data rate has an RSSI threshold less than or equal to the lookup RSSI. An achievable throughput can be computed for each valid data rate based on a theoretical rate and a packet error rate (PER). The valid data rate having the highest achievable throughput can be chosen as the new transmission rate. A rate control table, which can include RSSI thresholds, UDP rates, and PERs for each supported data rate, can be updated based on actual transmission information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.