Method for transmitting multi-user frame in wireless LAN system
First Claim
1. A method of transmitting a multi-user frame by an STA in a wireless communication system, comprising:
- receiving a first downlink frame;
transmitting a first uplink frame in response to the first downlink frame;
transmitting a second uplink frame to a AP (access point) for requesting a second downlink frame;
receiving the second downlink frame including time synchronization information and frequency synchronization information from the AP;
adjusting time synchronization and frequency synchronization using the time synchronization information and the frequency synchronization information;
receiving a third downlink frame including MU frame assignment information; and
transmitting an MU frame according to the MU assignment information,wherein the time synchronization information is determined in a manner of comparing a difference between measurement values for frames exchanged before the reception of the second downlink frame with a reference valuewherein the reference value comprises a value common to multi-user transmission related STAs, andwherein the frequency synchronization information is obtained from a preamble of the second uplink frame.
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Abstract
A method by which an STA transmits a multi-user (MU) frame in a wireless communication system, according to one embodiment of the present invention comprises the steps of: receiving, from an access point (AP), a second downlink frame including time synchronization information and frequency synchronization information; adjusting a time synchronization and a frequency synchronization by using the time synchronization information and the frequency synchronization information; receiving a third downlink frame including MU frame allocation information; and transmitting the MU frame according to the MU allocation information, wherein the time synchronization information is determined by comparing, to a reference value, a difference of measurement values relating to frames exchanged prior to the reception of the second downlink frame, and the reference value is a common value among STAs related to a multi-user transmission.
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Citations
10 Claims
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1. A method of transmitting a multi-user frame by an STA in a wireless communication system, comprising:
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receiving a first downlink frame; transmitting a first uplink frame in response to the first downlink frame; transmitting a second uplink frame to a AP (access point) for requesting a second downlink frame; receiving the second downlink frame including time synchronization information and frequency synchronization information from the AP; adjusting time synchronization and frequency synchronization using the time synchronization information and the frequency synchronization information; receiving a third downlink frame including MU frame assignment information; and transmitting an MU frame according to the MU assignment information, wherein the time synchronization information is determined in a manner of comparing a difference between measurement values for frames exchanged before the reception of the second downlink frame with a reference value wherein the reference value comprises a value common to multi-user transmission related STAs, and wherein the frequency synchronization information is obtained from a preamble of the second uplink frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In transmitting a multi-user (MU) frame in a wireless communication system, an STA device, comprising:
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a receiving module; and a processor configured to; receive a first downlink frame, transmit a first uplink frame in response to the first downlink frame, transmit a second uplink frame to a AP (access point) for requesting a second downlink frame, receive the second downlink frame including time synchronization information and frequency synchronization information from the AP, adjust time synchronization and frequency synchronization using the time synchronization information and the frequency synchronization information, receive a third downlink frame including MU frame assignment information, and transmit an MU frame according to the MU assignment information, wherein the time synchronization information is determined in a manner of comparing a difference between measurement values for frames exchanged before the reception of the second downlink frame with a reference value wherein the reference value is common to multi-user transmission related STAs, and wherein the frequency synchronization information is obtained from a preamble of the second uplink frame.
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Specification