Cognitive radio system and method
First Claim
1. A Cognitive Radio (CR) system for distinguishing channels without interference from other RF devices in Wireless Local Area Network (WLAN) comprises:
- (a) a WLAN-event sensor for detection WLAN event happening in current channel signal;
(b) a Receiving-Signal-Strength-Indicator-event sensor (RSSI-event sensor) for detecting RSSI-event happening in current channel signal;
(c) an average computer for computing an average value of RSSI (RSSI_AVG) in current channel during RSSI-event happening;
(d) a WLAN packet counter for counting a number of WLAN packets (WLAN_CNT) in current channel during WLAN-event happening;
(e) a first available-channel for selecting one and plurality of channels with small RSSI_AVG and WLAN_CNT=0 to an available channel list and sorting the one and plurality of rest channels out of the available channel list from low RSSI_AVG to high RSSI_AVG to a sorting list;
(f) a second available-channel selector for selecting one and plurality of channels without any WLAN event from sequence of the sorting list to the available channel list and deleting the one and plurality of selected channels from the sorting list; and
(g) a third available-channel selector for sorting one and plurality of channels in the sorting list by their WLAN_CNT and storing them to the available channel list from small to large WLAN_CNT,wherein the WLAN channels include channels in 2.4 GHz Industrial, Scientific and Medical band (ISM band) and Unlicensed National Information Infrastructure band (UNII band).
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Abstract
A cognitive radio system and method for clear and idle channel survey in Wireless Local Area Network (WLAN) are disclosed. Through computing average value of Received-Signal-Strength-Indicator (RSSI_AVG) in each channel, clear channels without interference from other RF devices can be distinguished in the present system and method. Based on an actual WLAN setup, a further AP has a larger possibility to be an idle and clear AP. In the present system and method, searching available channels from furthest AP to nearest AP therefore helps to reduce time of channel survey through repeated rises of signal strength threshold.
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Citations
21 Claims
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1. A Cognitive Radio (CR) system for distinguishing channels without interference from other RF devices in Wireless Local Area Network (WLAN) comprises:
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(a) a WLAN-event sensor for detection WLAN event happening in current channel signal; (b) a Receiving-Signal-Strength-Indicator-event sensor (RSSI-event sensor) for detecting RSSI-event happening in current channel signal; (c) an average computer for computing an average value of RSSI (RSSI_AVG) in current channel during RSSI-event happening; (d) a WLAN packet counter for counting a number of WLAN packets (WLAN_CNT) in current channel during WLAN-event happening; (e) a first available-channel for selecting one and plurality of channels with small RSSI_AVG and WLAN_CNT=0 to an available channel list and sorting the one and plurality of rest channels out of the available channel list from low RSSI_AVG to high RSSI_AVG to a sorting list; (f) a second available-channel selector for selecting one and plurality of channels without any WLAN event from sequence of the sorting list to the available channel list and deleting the one and plurality of selected channels from the sorting list; and (g) a third available-channel selector for sorting one and plurality of channels in the sorting list by their WLAN_CNT and storing them to the available channel list from small to large WLAN_CNT, wherein the WLAN channels include channels in 2.4 GHz Industrial, Scientific and Medical band (ISM band) and Unlicensed National Information Infrastructure band (UNII band). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A Cognitive Radio (CR) method for distinguishing channels without interference from other RF devices in Wireless Local Area Network (WLAN) comprises steps of:
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(a) grabbing a period of signal for a waiting time in the current channel; (b) distinguishing one and a plurality of durations as WLAN event happening; (c) distinguishing one and a plurality of durations as Received Signal Strength Indicator (RSSI) event happening; (d) computing an average value of RSSI (RSSI_AVG) in the current channel during the RSSI event happening; (e) counting a number of WLAN packets (WLAN_CNT) in the current channel during the WLAN event happening; and (f) selecting one and plurality of channels with small RSSI_AVG and WLAN_CNT=0 to an available channel list and sorting the one and plurality of rest channels out of the available channel list from low RSSI_AVG to high RSSI_AVG to a sorting list, wherein the WLAN channels include channels in 2.4 GHz Industrial, Scientific and Medical band (ISM band) and Unlicensed National Information Infrastructure band (UNII band). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification