Invention Grant
- Patent Title: Methods permitting a wireless system receiver to determine and report channel conditions to a system transmitter
- Patent Title (中): 允许无线系统接收机确定并向系统发射机报告信道条件的方法
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Application No.: US13924377Application Date: 2013-06-21
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Publication No.: US09191146B2Publication Date: 2015-11-17
- Inventor: Zhanfeng Jia , Shu Du , Ning Zhang
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Holland & Hart LLP
- Main IPC: H04L1/00
- IPC: H04L1/00 ; H04L1/16 ; H04L1/20

Abstract:
A method of providing feedback on channel observations to a transmitter includes observing a channel at a receiver based on received signals from the transmitter and determining whether a packet error rate (PER) is rising based on the observing. The receiver determines whether a rising PER is caused by channel noise or interference, and transmits a message to the transmitter indicating the cause of the rising PER. The cause may be encoded in reserved bits of a block acknowledgement (BA) frame or an Acknowledge (ACK) frame, or in a modulation coding scheme (MCS) used to transmit the message. The cause may be detected in response to SNR/RSSI level of received signals, or a number of receiver restarts. The transmitter may change the transmit rate adaptation algorithm to use a lower MCS if channel noise causes the rising PER, and a higher MCS if interference causes the rising PER.
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