Patent ID: 8098640
Filing Date: 2012-01-17
Classification: H04L,H04W

Abstract:
1. A high-throughput (HT) receiving station configured to operate in a wireless local area network (WLAN), the receiving station configured to: receive a data frame sent from a transmitting station by a number of spatial streams (Nss) concurrently over two or more sets of orthogonal frequency division multiplexed (OFDM) subcarriers, each spatial stream having a modulation and coding scheme (MCS), the data frame including a duration ID field; and determine a MCS for a control response frame comprising either an acknowledgement (ACK) frame or a clear-to-send (CTS) frame to be sent in response to receipt of the data frame based on the MCS of each spatial-multiplexed stream of the data frame; and transmit the control response frame to the transmitting station without spatial multiplexing on one of the sets of OFDM subcarriers in accordance with the determined MCS, wherein the MCS for the control response frame is selected from a basic MCS set that is a subset of MCSs associated with a particular Nss, wherein the duration ID field indicates a duration that includes the control response frame, wherein the transmitting station is configured to predict the MCS of the control response frame to be received based on the MCS of each spatial-multiplexed stream of the data frame, and wherein the transmitting station is configured to determine the duration ID field based in part on the predicted MCS to allow the control response frame to be protected by a network allocation vector (NAV) for the duration indicated.