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US 7,463,583 B2Granted
Wireless LAN data rate adaptation
AssigneeSTMicroelectronics S.r.l.
InventorMounir Hamdi
Life of this patent
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Abstract
A WLAN communication system and algorithm that adaptively changes the data transmission rate of a communication channel based on changing channel conditions. The WLAN communication system or algorithm has two modes being a searching mode and a transmission mode. Furthermore, the WLAN communication system or algorithm incorporates an additive increase, multiplicative decrease (AIMD) function into the rate adaptation algorithm.
Claims18
A Wireless LAN system (WLAN) comprising:
- a sending station programmed to send WLAN communications;
- a receiving station programmed to receive WLAN communications from, at least said sending station;
- said sending station programmed to send said WLAN communications using an adaptive rate algorithm, said adaptive rate algorithm having a searching mode for searching for a data transmission rate mode that provides successful WLAN communication between said sending station and said receiving station;
- said adaptive rate algorithm having a transmission mode wherein said data transmission rate mode remains the same until a predetermined number of unsuccessful communication attempts occur,
- wherein when in said transmission mode, said data transmission rate mode is increased to a new data transmission rate mode equal to ((a current data transmission rate mode number)+((a total number of possible data transmission rate modes)−(the current data transmission rate mode number)) / 2) when a threshold number (TH) of successful data frame transmissions are concurrently made.
2 more elements
A method of communicating in a WLAN system comprising:
- sending a data frame, by a sending device, to a receiving device, said sending is performed in a current data transmission rate mode;
- determining whether an acknowledge signal is received at said sending device;
- if said acknowledge signal is received at said sending device, incrementing a success threshold counter by one;
- if said success threshold counter is equal to a success threshold number (TH), then increasing said current data transmission rate mode to a new data transmission rate mode equal to ((a current data transmission rate mode number)+((a total number of possible data transmission rate modes)−(the current data transmission rate mode number))/2) and resetting said success threshold counter to zero;
- if said success threshold counter is not equal to said success threshold number, then incrementing said success threshold counter by one and sending a next data frame from said sending device to said receiving device.
2 more elements
A WLAN system comprising:
- a sending device for sending wireless communications in a WLAN network on a channel using an adaptive rate algorithm having a searching mode and a transmission mode;
- wherein in said transmission mode, a data transmission rate mode is increased to a new data transmission rate mode equal to ((a current data transmission rate mode number)+((a total number of possible data transmission rate modes)+(the current data transmission rate mode number))/2) when a threshold number (TH) of successful data frame transmissions are concurrently made.
Dependencies are inferred from the claim text.