MIMO WLAN SYSTEM
First Claim
1. A method of accessing a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
- receiving system information via a first transport channel on a downlink;
transmitting an access request via a second transport channel on an uplink, wherein the access request is transmitted based on the received system information;
monitoring a third transport channel on the downlink for an acknowledgment of the transmitted access request; and
repeating the receiving, transmitting, and monitoring if the acknowledgment is not received within a predetermined time period.
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Accused Products
Abstract
A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implements rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgment, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may then be simplified by taking advantage of the reciprocal nature of the downlink and uplink and the calibration.
288 Citations
21 Claims
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1. A method of accessing a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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receiving system information via a first transport channel on a downlink; transmitting an access request via a second transport channel on an uplink, wherein the access request is transmitted based on the received system information; monitoring a third transport channel on the downlink for an acknowledgment of the transmitted access request; and repeating the receiving, transmitting, and monitoring if the acknowledgment is not received within a predetermined time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus in a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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a receive data processor operative to receive system information via a first transport channel on a downlink; a transmit data processor operative to process an access request for transmission via a second transport channel on an uplink, wherein the access request is transmitted based on the received system information; a controller operative to monitor a third transport channel on the downlink for an acknowledgment of the transmitted access request, and wherein the receive data processor is operative to receive updated system information, the transmit data processor operative to process another access request, and the controller operative to monitor the third transport channel if the acknowledgment is not received within a predetermined time period. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus in a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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means for receiving system information via a first transport channel on a downlink; means for transmitting an access request via a second transport channel on an uplink, wherein the access request is transmitted based on the received system information; means for monitoring a third transport channel on the downlink for an acknowledgment of the transmitted access request; and means for repeating the receiving, transmitting, and monitoring if the acknowledgment is not received within a predetermined time period. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification