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US 8,045,514 B2Granted
Transmitting frames in wireless local area network (WLAN)
AssigneeSamsung Electronics Co., Ltd.
InventorsHak-Hoon Song, Min-Cheul Cha, Bo-Seung Hwang, Seong-Jae Min, Myeon-Kee Youn, Joo-Yong Park
Life of this patent
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Abstract
A method and apparatus for transmitting frames in a Wireless Local Area Network (WLAN), each station in the WLAN determines whether there is another station in a hidden state. The station transmits a frame to an Access Point (AP) without performing an Request To Send/Clear To Send (RTS/CTS) mechanism when there is another station in a hidden state, thereby improving use efficiency of the wireless network and minimizing frame transmission delay.
Claims30
A Wireless Local Area Network (WLAN) comprising:
- at least one station;
- and
- an Access Point (AP) configured to recognize frame transmission state information of a station based on a frame received from the station and to broadcast the frame transmission state information to each station,
- wherein the at least one station is configured to recognize wireless medium sensing information of other stations from frames sensed over a wireless network, to generate mechanism determination information based on the frame transmission state information received from the AP and the wireless medium sensing information, and to perform a mechanism based on the mechanism determination information before transmitting a frame to the AP or to directly occupy the wireless medium to transmit the frame to the AP without performing the mechanism upon there being a frame to be transmitted to the AP,
- wherein the AP comprises:
- a state manager configured to create a state table, the state table comprising frame transmission state information of each station obtained by comparing frame reception time information to a first time, and address information;
- and
- a message processor configured to broadcast the frame transmission state information and the address information of each station included in the state table to each station.
5 more elements
A frame transmission method in a Wireless Local Area Network (WLAN) comprising at least one station and an Access Point (AP), the method comprising:
- recognizing, by the AP, frame transmission state information of a station based on a frame received from a station and broadcasting the frame transmission state information and address information to each station;
- recognizing, by each station, wireless medium sensing information and address information of other stations from sensed frames;
- generating, by each station, mechanism determination information based on the frame transmission state information received from the AP and the wireless medium sensing information;
- and
- checking, by each station, the mechanism determination information to either transmit a frame to the AP through a mechanism or to occupy the wireless medium and transmit the frame to the AP without the mechanism upon there being a frame to be transmitted to the AP,
- wherein recognizing the frame transmission state information comprises:
- parsing, by the AP, at least one address field of the received frame;
- checking address information of the station transmitting the received frame and frame reception time information upon Base Service Set Identification (BSS ID) information of the received frame being the same as BSS ID information of each station;
- and
- labeling the frame transmission state information corresponding to each station based on a result of a comparison of a difference time information between the reception time information and the current time information to a first time.
7 more elements
A frame transmission method in a Wireless Local Area Network (WLAN) comprising at least one station and an Access Point (AP), the method comprising:
- recognizing, by the AP, frame transmission state information of a station based on a frame received from a station and broadcasting the frame transmission state information and address information to each station;
- recognizing, by each station, wireless medium sensing information and address information of other stations from sensed frames;
- generating, by each station, mechanism determination information based on the frame transmission state information received from the AP and the wireless medium sensing information;
- and
- checking, by each station, the mechanism determination information to either transmit a frame to the AP through a mechanism or to occupy the wireless medium and transmit the frame to the AP without the mechanism upon there being a frame to be transmitted to the AP,
- wherein recognizing the wireless medium sensing information comprises:
- parsing, by each station, at least one address field of the sensed frame;
- checking address information of the station transmitting the sensed frame and frame sensing time information upon BSS ID information of the frame being the same as BSS ID information of a service area of the station;
- and
- labeling the wireless medium sensing information corresponding to each station based on a result of comparison of a difference time information between the frame sensing time information and the current time information to a second time.
7 more elements
A frame transmission method in a Wireless Local Area Network (WLAN) comprising at least one station and an Access Point (AP), the method comprising:
- recognizing, by the AP, frame transmission state information of a station based on a frame received from a station and broadcasting the frame transmission state information and address information to each station;
- recognizing, by each station, wireless medium sensing information and address information of other stations from sensed frames;
- generating, by each station, mechanism determination information based on the frame transmission state information received from the AP and the wireless medium sensing information;
- and
- checking, by each station, the mechanism determination information to either transmit a frame to the AP through a mechanism or to occupy the wireless medium and transmit the frame to the AP without the mechanism upon there being a frame to be transmitted to the AP,
- wherein generating the mechanism determination information comprises mapping the frame transmission state information to the wireless medium sensing information according to the address information of each station to generate information requiring the mechanism upon there being the same address information having state information indicating ON state information and the wireless medium sensing information indicating hidden sensing information, and to generate information requiring no mechanism upon there being no same address information having state information indicating ON state information and the wireless medium sensing information indicating hidden sensing information.
3 more elements
A Wireless Local Area Network (WLAN) comprising:
- an Access Point (AP) configured to recognize frame transmission state information of each station based on a frame received from each station included in a service area, and to broadcast the frame transmission state information to each station included in the service area;
- and
- at least one station configured to recognize wireless medium sensing information of other stations from frames sensed over a wireless network, and to determine a station in a hidden state in the service area from the frame transmission state information received from the AP and the wireless medium sensing information,
- wherein the at least one station is configured to transmit a frame to the AP through a Request To Send/Clear To Send (RTS/CTS) mechanism only if the at least one station determines a station in the hidden state exists in the service area,
- wherein the AP is configured to recognize frame transmission state information of each station from a result of a comparison of a frame reception time information to a first time, to parse at least one address field of the received frame, and to store address information corresponding to each station and the frame transmission state information,
- wherein the AP is configured to label frame transmission state information of the station having the address information as OFF state information upon a difference time information between the frame reception time information and a current time information being greater than the first time, and to label the frame transmission state information as ON state information upon the difference time information between the frame reception time information and the current time information being smaller than the first time.
3 more elements
A Wireless Local Area Network (WLAN) comprising:
- an Access Point (AP) configured to recognize frame transmission state information of each station based on a frame received from each station included in a service area, and to broadcast the frame transmission state information to each station included in the service area;
- and
- at least one station configured to recognize wireless medium sensing information of other stations from frames sensed over a wireless network, and to determine a station in a hidden state in the service area from the frame transmission state information received from the AP and the wireless medium sensing information,
- wherein the at least one station is configured to transmit a frame to the AP through a Request To Send/Clear To Send (RTS/CTS) mechanism only if the at least one station determines a station in the hidden state exists in the service area,
- wherein each station is configured to recognize wireless medium sensing information based on a result of a comparison of a frame sensing time information to a second time, to parse at least one address field of the sensed frame, and to store address information corresponding to each station and the wireless medium sensing information.
2 more elements
A Wireless Local Area Network (WLAN) comprising:
- an Access Point (AP) configured to recognize frame transmission state information of each station based on a frame received from each station included in a service area, and to broadcast the frame transmission state information to each station included in the service area;
- and
- at least one station configured to recognize wireless medium sensing information of other stations from frames sensed over a wireless network, and to determine a station in a hidden state in the service area from the frame transmission state information received from the AP and the wireless medium sensing information,
- wherein the at least one station is configured to transmit a frame to the AP through a Request To Send/Clear To Send (RTS/CTS) mechanism only if the at least one station determines a station in the hidden state exists in the service area,
- wherein each station is configured to determine that a station state of the address information is the hidden state upon there being address information of a station having the frame transmission state information indicating ON state information and wireless medium sensing information indicating hidden state information.
2 more elements
A Wireless Local Area Network (WLAN) comprising:
- an Access Point (AP) configured to recognize frame transmission state information of each station based on a frame received from each station included in a service area, and to broadcast the frame transmission state information to each station included in the service area;
- and
- at least one station configured to recognize wireless medium sensing information of other stations from frames sensed over a wireless network, and to determine a station in a hidden state in the service area from the frame transmission state information received from the AP and the wireless medium sensing information,
- wherein the at least one station is configured to transmit a frame to the AP through a Request To Send/Clear To Send (RTS/CTS) mechanism only if the at least one station determines a station in the hidden state exists in the service area,
- wherein each station is configured to determine that a station state of the address information is not the hidden state upon there being no wireless medium sensing information indicating hidden state information that corresponds to address information having the frame transmission state information indicating ON state information.
2 more elements
A method of managing a station state in a Wireless Local Area Network (WLAN) comprising at least one station and an Access Point (AP), the method comprising:
- recognizing, by the AP, frame transmission state information of each station based on a frame received from each station, and broadcasting the frame transmission state information to each station;
- recognizing, by each station, wireless medium sensing information of other stations based on sensed frames;
- and
- determining, by each station, hidden state information of each station based on the frame state information received from the AP and the wireless medium sensing information,
- wherein the at least one station is configured to transmit a frame to the AP through a Request To Send/Clear To Send (RTS/CTS) mechanism only if the at least station determines a station in the hidden state exists in the service area,
- wherein recognizing the frame transmission state information comprises:
- parsing, by the AP, at least one address field of the received frame;
- checking address information of a station transmitting the received frame and frame reception time information upon Base Service Set Identification (BSS ID) information of the received frame being the same as BSS ID information of the AP;
- recognizing the frame transmission state information of a station having the address information as OFF state information upon a difference time information between a frame reception time information and a current time information being greater than a first time;
- and
- recognizing the frame transmission state information of the station having the address information as ON state information upon the difference time information between the frame reception time information and the current time information being smaller than the first time.
8 more elements
A method of managing a station state in a Wireless Local Area Network (WLAN) comprising at least one station and an Access Point (AP), the method comprising:
- recognizing, by the AP, frame transmission state information of each station based on a frame received from each station, and broadcasting the frame transmission state information to each station;
- recognizing, by each station, wireless medium sensing information of other stations based on sensed frames;
- and
- determining, by each station, hidden state information of each station based on the frame state information received from the AP and the wireless medium sensing information,
- wherein the at least one station is configured to transmit a frame to the AP through a Request To Send/Clear To Send (RTS/CTS) mechanism only if the at least station determines a station in the hidden state exists in the service area,
- wherein recognizing the wireless medium sensing information comprises:
- parsing, by each station, at least one address field of the sensed frame;
- checking address information of the station transmitting the sensed frame and frame sensing time information upon BSS ID information of the frame being the same as BSS ID information of a service area which the station belongs to;
- recognizing wireless medium sensing information of a station having the address information as hidden information upon a difference time information between a frame sensing time information and a current time information being greater than a second time;
- and
- recognizing the wireless medium sensing information of the station having the address information as sense information upon the difference time information between the frame sensing time information and the current time information being smaller than the second time.
8 more elements
A method of managing a station state in a Wireless Local Area Network (WLAN) comprising at least one station and an Access Point (AP), the method comprising:
- recognizing, by the AP, frame transmission state information of each station based on a frame received from each station, and broadcasting the frame transmission state information to each station;
- recognizing, by each station, wireless medium sensing information of other stations based on sensed frames;
- and
- determining, by each station, hidden state information of each station based on the frame state information received from the AP and the wireless medium sensing information,
- wherein the at least one station is configured to transmit a frame to the AP through a Request To Send/Clear To Send (RTS/CTS) mechanism only if the at least station determines a station in the hidden state exists in the service area,
- wherein determining hidden state information of each station comprises mapping the frame transmission state information to the wireless medium sensing information according to the address information of each station, and either determining the station as a hidden state upon there being the same address information having the frame transmission state information indicating ON state information and the wireless medium sensing information indicating hidden sensing information, or determining a station state of the address information as a hidden state upon there being no wireless medium sensing information that corresponds to address information having the frame transmission state information indicating ON state information.
3 more elements
Dependencies are inferred from the claim text.