Link adaptation and device in active scanning method
First Claim
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1. A method for performing link adaptation, the method comprising:
- transmitting, by a station (STA), a probe request frame including a Null Data Packet (NDP) Announcement (NDPA) information element to an access point (AP), the NDPA information element including NDP information indicating whether the probe request frame is used as an NDPA frame;
transmitting, by the STA, an NDP including only a Physical Layer Convergence Protocol (PLCP) header to the AP after transmitting the probe request frame;
receiving, by the STA, a probe response frame from the AP including a feedback information element determined based on the NDP, the feedback information element including Modulation and Coding Scheme (MCS) feedback information when Multiple Input Multiple Output (MIMO) transmission is performed and including sounding feedback information when beamforming transmission is performed;
determining, by the STA, a radiation pattern and transmission power of antennas based on the MCS feedback information and the sounding feedback information; and
transmitting, by the STA, an authentication request frame by using the determined radiation pattern and transmission power.
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Abstract
Disclosed are a link adaptation method and device in an active scanning method. The link adaptation method transmits a the probe request frame comprising null data packet announcement (NDPA) information elements, transmits a null data packet (NDP) frame comprising only a physical layer convergence protocol (PLCP) header after transmitting the probe request frame, and receives a the probe response frame comprising feedback information elements measured based on the NDP frame. Therefore, the invention is capable of improving data transmission efficiency by using a modulation coding scheme (MCS) suitable for a channel state from initial connection.
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10 Claims
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1. A method for performing link adaptation, the method comprising:
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transmitting, by a station (STA), a probe request frame including a Null Data Packet (NDP) Announcement (NDPA) information element to an access point (AP), the NDPA information element including NDP information indicating whether the probe request frame is used as an NDPA frame; transmitting, by the STA, an NDP including only a Physical Layer Convergence Protocol (PLCP) header to the AP after transmitting the probe request frame; receiving, by the STA, a probe response frame from the AP including a feedback information element determined based on the NDP, the feedback information element including Modulation and Coding Scheme (MCS) feedback information when Multiple Input Multiple Output (MIMO) transmission is performed and including sounding feedback information when beamforming transmission is performed; determining, by the STA, a radiation pattern and transmission power of antennas based on the MCS feedback information and the sounding feedback information; and transmitting, by the STA, an authentication request frame by using the determined radiation pattern and transmission power. - View Dependent Claims (2, 3, 4, 5)
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6. A station (STA) for performing link adaptation, the STA comprising:
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a transceiver configured to transmit or receive a radio frequency (RF) signal; and a processor operatively connected to the transceiver and configured to; transmit a probe request frame including a Null Data Packet (NDP) Announcement (NDPA) information element to an access point (AP), the NDPA information element including NDP information indicating whether the probe request frame is used as an NDPA frame; transmit an NDP including only a Physical Layer Convergence Protocol (PLCP) header to the AP after transmitting the probe request frame; receive a probe response frame from the AP including a feedback information element determined based on the NDP, the feedback information element including Modulation and Coding Scheme (MCS) feedback information when Multiple Input Multiple Output (MIMO) transmission is performed and including sounding feedback information when beamforming transmission is performed, determine a radiation pattern and transmission power of antennas based on the MCS feedback information and the sounding feedback information; and transmit an authentication request frame by using the determined radiation pattern and transmission power. - View Dependent Claims (7, 8, 9, 10)
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Specification